CN103688557B - Method and device for data transmission - Google Patents

Abstract

A method for data transmission, the method comprising: generating a broadcast information frame BCF, wherein the BCF carries physical layer parameters indicating the configuration of a physical frame structure, and sending the BCF. The invention also discloses a device for data transmission.

Description

Method and device for data transmission

This application claims the priority of the Chinese patent application whose application date is March 31, 2011, application number is 201110081288.6, and the title of the invention is "a wireless communication method". The entire content of this prior application has been reflected in this application .

This application claims the priority of a Chinese patent application with an application date of March 31, 2011, an application number of 201110081193.4, and an invention title of "A Wireless Communication Method, System, and Equipment". reflected in this application.

This application claims the priority of a Chinese patent application with an application date of May 19, 2011, an application number of 201110130194.3, and an invention title of "a communication system". The entire content of this earlier application has been embodied in this application.

This application claims the priority of a Chinese patent application with an application date of July 6, 2011, an application number of 201110189248.3, and an invention title of "Method for Data Transmission". The entire content of this prior application has been reflected in this application .

This application claims the priority of the Chinese patent application with the application date of February 16, 2012, the application number 201210035785.7, and the invention title "Method and Device for Data Transmission". reflected in the application.

This application claims the priority of a Chinese patent application with an application date of February 29, 2012, an application number of 201210050629.8, and an invention title of "Method and Device for Data Transmission". reflected in the application.

technical field

The invention belongs to the field of wireless communication, in particular to a method and device for data transmission.

Background technique

In recent years, wireless communication systems have developed rapidly, such as wireless local area network technology WiFi based on 802.11 standards, Bluetooth (Bluetooth) systems based on 802.15, and Femto technology for indoor applications derived from mobile communication systems, etc., have been widely used. application.

802.11-based WiFi technology is the most widely used wireless network transmission technology today. Since the WiFi system adopts a carrier sense/collision avoidance (CSMA/CA, Carrier Sense Multiple Access with Collision Avoidance) mechanism, the system efficiency is low and wireless resources are greatly wasted. The root cause of this problem is that the CSMA/CA mechanism is a contention-based random multiple access mechanism, between the central access point (CAP, Access Point) and the station (STA, Station), or between different STAs , will compete for the right to use wireless resources through the CSMA/CA mechanism, and compete for wireless channels at the same time. At this time, collisions occur, resulting in waste of wireless resources. In order to avoid collisions, the CSMA/CA mechanism requires CAPs or STAs to back off randomly when competing for wireless channels. When all CAPs and STAs back off, the wireless channels are idle but not used, which is also a huge impact on the wireless channels. waste. For the above reasons, 802.11 systems are less efficient. For example: The peak rate of the physical layer of the 802.11g system can reach 54Mbps, but the maximum rate of the TCP layer under the large data packet download service is not higher than 30Mbps. Although there are the above disadvantages, the 802.11 system is flexible and does not rely on a centralized control mechanism, so it can also achieve lower equipment costs.

The Femto technology based on the 3GPP standard is a new technology for indoor coverage evolved from the mobile communication system. Based on the statistics of 3G systems, about 70% of the data services take place indoors, so the indoor high-speed data access solution is particularly important. Femto base stations, called pico base stations, are small in size and flexible in deployment. Due to the evolution from the mobile communication system, the Femto base station has almost inherited all the characteristics of the mobile communication system. Femto equipment only combines its limited coverage, fewer access users and other application scenarios to reduce equipment processing capabilities, thereby reducing equipment costs. Considering the duplex mode, like the mobile communication system, the Femto base station can be divided into two types of duplex mechanisms, FDD and TDD. The uplink and downlink carrier resources of FDD are symmetrical, while the uplink and downlink data traffic of data services is asymmetrical, which makes the FDD system waste resources to a certain extent when facing data services. The uplink and downlink of the TDD system work on the same carrier, and allocate different wireless resources for the uplink and downlink by dividing time resources, so it can better adapt to data services with asymmetric uplink and downlink service requirements than FDD. However, the TDD duplex mode of the mobile communication system (including the Femto system) and the static allocation of uplink and downlink resources face various data services with different requirements, such as web browsing, mobile video, mobile games, etc., and it is difficult to realize the business requirements and resources Dynamic adaptation of partitions. Compared with Wi-Fi, because Femto adopts a centralized control mechanism based on scheduling, there is no waste of wireless resources due to contention conflicts and random backoffs between base stations or CAPs and terminals or terminals, so the link efficiency is higher.

For wireless communication systems, there is a need for data transmission.

Contents of the invention

In view of this, the object of the present invention is to provide a method and device for data transmission.

In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is presented below. This summary is not an overview, nor is it intended to identify key/critical elements or delineate the scope of these embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.

Technical scheme of the present invention is realized like this:

A method for data transmission, characterized in that the method comprises:

Generate a broadcast information frame (BCF), which carries physical layer parameters indicating the configuration of the physical frame structure;

Send the BCF.

In one embodiment, the physical layer parameters include one or more of the following:

A downlink sounding pilot pattern indicating a downlink sounding pilot image index;

The position of the downlink sounding channel indicating the position of the downlink sounding channel in the downlink transport channel;

Indicates the demodulation pilot time domain period of the number of OFDM symbols of the demodulation pilot time domain interval;

The downlink guard interval DGI indicating the transition time between downlink and uplink;

Uplink guard interval indicating the transition time between uplink and downlink.

A method for data transmission, the method comprising:

Generate a broadcast information frame BCF, which carries the working channel and working bandwidth of the CAP, for the STA to determine the working sub-channel of the CAP;

Send the BCF.

A device for data transmission, the device comprising:

A generating unit, configured to generate a broadcast information frame BCF, wherein the BCF carries a physical layer parameter indicating a configuration of a physical frame structure;

A sending unit, configured to send the BCF.

In one embodiment, the physical layer parameters include one or more of the following:

A downlink sounding pilot pattern indicating a downlink sounding pilot image index;

The position of the downlink sounding channel indicating the position of the downlink sounding channel in the downlink transport channel;

Indicates the demodulation pilot time domain period of the number of OFDM symbols of the demodulation pilot time domain interval;

The downlink guard interval DGI indicating the transition time between downlink and uplink;

Uplink guard interval indicating the transition time between uplink and downlink.

A device for data transmission, the device comprising:

A generating unit, configured to generate a broadcast information frame BCF, where the BCF carries the working channel and the working bandwidth of the CAP, for the STA to determine the working sub-channel of the CAP;

A sending unit, configured to send the BCF.

To the above and related ends, one or more embodiments comprise the features hereinafter specified and particularly pointed out in the claims. The following description and drawings detail certain exemplary aspects and are indicative of but a few of the various ways in which the principles of various embodiments may be employed. Other benefits and novel features will become apparent upon consideration of the following detailed description in conjunction with the accompanying drawings, and the disclosed embodiments are intended to include all such aspects and their equivalents.

Description of drawings

Fig. 1 is the flow chart of the first method for data transmission in the present invention;

Fig. 2 is a flow chart of the second method for data transmission in the present invention;

FIG. 3 is a flowchart of a method for accessing a wireless network in an embodiment of the present invention;

Figure 4 is a reference model for the EUHT system;

Figure 5 is the composition of the access system of the EUHT system;

Figure 6 is the process of sending and receiving protocol data between STA and CAP;

FIG. 7 is a method flow for obtaining synchronization in an embodiment of the present invention;

Fig. 8 is a flowchart of STA keeping synchronization;

FIG. 9 is a flowchart of a random access method in an embodiment of the present invention;

FIG. 10 is a schematic diagram of sending a random access sequence in an embodiment of the present invention;

Figures 11a to 11c are the formats of the uplink random access channel in the embodiment of the present invention;

FIG. 12 is a flowchart of a method for capability negotiation in an embodiment of the present invention;

Figure 13 is a schematic structural view of the first device for data transmission in the present invention

FIG. 14 is a schematic structural diagram of a terminal-side device accessing a wireless network in an embodiment of the present invention;

FIG. 15 is a schematic structural diagram of a device for obtaining system synchronization in an embodiment of the present invention;

FIG. 16 is another schematic structural diagram of a device for obtaining system synchronization in an embodiment of the present invention;

FIG. 17 is a schematic structural diagram of a first random access terminal side device in an embodiment of the present invention;

FIG. 18 is a schematic structural diagram of a capability negotiation terminal side device in an embodiment of the present invention;

FIG. 19 is a schematic structural diagram of a network-side device accessing a wireless network in the present invention;

FIG. 20 is a schematic structural diagram of a first random access wireless network side device in an embodiment of the present invention;

Fig. 21 is a schematic structural diagram of a capability negotiation network side device in an embodiment of the present invention.

detailed description

The following description and drawings illustrate specific embodiments of the invention sufficiently to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the present invention includes the full scope of the claims, and all available equivalents of the claims. These embodiments of the present invention may be referred to herein, individually or collectively, by the term "invention", which is for convenience only and is not intended to automatically limit the application if in fact more than one invention is disclosed The scope is any individual invention or inventive concept.

The present invention provides two methods for data transmission.

Fig. 1 is a flow chart of the first method for data transmission in the present invention, the process includes:

Step 11: Generate a BCF, where the BCF carries physical layer parameters indicating the configuration of the physical frame structure.

Step 12: Send the BCF.

It can be seen that in the first method for data transmission provided by the present invention, by sending a broadcast frame, the physical layer parameters indicating the configuration of the physical frame structure are broadcast, and for the case of dynamic configuration of the physical frame structure, the receiving end of the broadcast frame In this way the structure of the physical frame is known.

Fig. 2 is the second method flowchart for data transmission in the present invention, and this process comprises:

Step 21: Generate a BCF, which carries the working channel and working bandwidth of the CAP, for the STA to determine the working sub-channel of the CAP;

Step 22: Send the BCF.

It can be seen that in the second method for data transmission provided by the present invention, the working channel and working bandwidth of the CAP are broadcast by sending broadcast frames to provide reference for the STA to determine the working sub-channel of the CAP.

The following takes the process of accessing a wireless network and the Enhanced Ultra High Speed Wireless Local Area Network (EUHT) system as examples to illustrate optional embodiments of the present invention.

Fig. 3 is a flow chart of a method for accessing a wireless network in the present invention, the process comprising:

Step 31: Get System Sync.

The acquisition of system synchronization here, including the acquisition of system parameters, is equivalent to the process of system initialization.

Step 32: randomly access the CAP, and perform capability negotiation with the CAP.

In this step, the random access process is performed based on the result of step 31, and the capability negotiation process is performed using the result obtained after the random access is completed, and the specific content will be described in detail later.

Figure 4 is a reference model of the EUHT system.

The system reference model shown in Figure 4 mainly refers to the air interface reference model, including: media access control (MAC) layer and physical (PHY) layer, and the main functions of each layer are briefly described as follows:

① MAC layer includes adaptation sublayer and MAC sublayer.

Adaptation sublayer: mainly provides the function of mapping and conversion between external network data and MAC layer service agreement unit (MSDU). MSDU refers to information delivered as a unit between MAC Service Access Points (SAPs).

MAC sublayer: In addition to acting as the media access control function, it also includes management and control of the system and support for specific functions of the PHY layer.

②PHY layer: mainly provides a PHY transmission mechanism that maps MPDUs to corresponding physical channels, such as Orthogonal Frequency Division Multiplexing (OFDM) and Multiple Input Multiple Output (MIMO) technologies. MPDU refers to a data unit exchanged between two peer MAC entities using PHY layer services.

Figure 5 shows the composition of the access system of the EUHT system, including the central access point (CAP) and the station (STA), where the STA can be various data devices, such as: PDA, notebook, camera, video camera, mobile phone, tablet computer and pad Wait. As shown in FIG. 5 , STA1 and STA2 access the CAP through an air interface protocol, and the CAP establishes communication with an existing external network (eg, IP backbone network, Ethernet) through wired or wireless. Among them, the protocol composition of CAP includes MAC layer and PHY layer. The STA protocol consists of application (Application) layer, transmission control (TCP) layer, network (IP) layer, MAC layer and PHY layer.

Based on the protocol composition shown in Figure 5, Figure 6 shows the process of sending and receiving protocol data between STA and CAP. The application layer and the TCP/IP layer process and package them, and send them to the IP adaptation sublayer in the form of IP packets. The IP adaptation sublayer performs conversion and mapping, and sends them to the MAC sublayer. The MAC sublayer undergoes fragmentation, encryption, Operations such as framing and aggregation are sent to the PHY layer, and finally the PHY is mapped to the wireless channel for data transmission.

The exception handling involved in the following embodiments may use the system setting parameters shown in Table 1, and a unified introduction is given here.

Table 1

As an optional embodiment, the step of obtaining system synchronization in the process shown in Figure 1, that is, step 11 can be implemented through the following sub-steps:

Sub-step 1: Find a physical frame on the current sub-channel.

Sub-step 2: Analyze the system information channel (SICH) and control channel (CCH) in the found physical frame, the SICH indicates the structure of the physical frame, and the CCH indicates the allocation of system resources.

The method for accessing the wireless network in the present invention proposes that the physical frame structure can be dynamically configured, and the SICH in the physical frame indicates the structural configuration of the physical frame, such as indicating the existence and duration of each channel in the physical frame.

The CCH in the physical frame indicates the allocation of system resources, including an indication of resources allocated for system parameters.

Sub-step 3: Obtain system parameters from the physical frame by using the analysis result.

It can be seen that the present invention achieves system synchronization for the situation that the physical frame structure can be dynamically configured.

In the EUHT system, both STA and CAP can support 20MHz, 40MHz and 80MHz, and the system predetermined channel list indicates the subchannels of the system, and these subchannels can include one or more working subchannels of the CAP.

Table 2 below provides an example of a predetermined channel list in the 2.4GHz frequency band.

Table 2

Obtaining system synchronization in the embodiment of the present invention includes the process of obtaining synchronization shown in FIG. 7, and the process of obtaining synchronization includes:

Step 71: Find the physical frame on the current subchannel, specifically, judge whether the frame header of the physical frame is detected on the current subchannel, if yes, perform step 72, otherwise continue to perform detection until the waiting time of the subchannel is exceeded , transfer to the next sub-channel and continue to execute step 71.

Step 72: Determine whether the SICH and CCH in the physical frame can be resolved, if yes, execute step 73, otherwise continue to execute step 71, until the waiting time of the subchannel is exceeded, transfer to the next subchannel and continue to execute step 71.

In the physical frame targeted by the present invention, the positions and durations of the preamble and the SICH are preset, and no dynamic configuration is performed. The CCH is located adjacent to the SICH, and the duration of the CCH can be dynamically configured.

The SICH indicates the structural configuration of the physical frame, and specifically may indicate the existence and/or duration of each channel in the current physical frame. For example, for some channels with fixed duration, 1 bit can be used in SICH to indicate the existence of the channel, which implicitly indicates the duration of the channel; for some channels with unfixed duration, multiple bits can be used for indication in SICH, with For example, 6 bits can be used in SICH, which can indicate a maximum of 63 OFDM symbols, and 1 OFDM symbol is the minimum resource allocation unit. For example, these 6 bits are 010000, and the converted decimal number is 16, which corresponds to 16 OFDM symbols.

By analyzing the SICH, the position and duration of the CCH in the physical frame can be determined, and then the broadcast scheduling signaling can be detected from the CCH in the physical frame to detect the resources allocated for the BCF. Table 3 below shows an example of broadcast scheduling signaling. The BCF is transmitted in the signaling/feedback channel shown in Table 3, and the signaling/feedback channel is included in the transmission channel. When b ₃ b ₂ b ₁ b ₀ is 0000, it is determined to be a downlink signaling/feedback channel resource indication, if b ₃₁ is 0, it is determined that there is a BCF frame, b ₃₆ b ₃₄ ... b ₃₂ indicates the location of the resource, b ₃₉ b ₃₈ b ₃₇ indicates the length of the resource.

table 3

Step 73: Determine whether a broadcast information frame (BCF) is detected, if so, realize downlink synchronization, otherwise return to step 71, until the waiting time of the sub-channel is exceeded, transfer to the next sub-channel and continue to execute step 71.

BCF is a broadcast configuration message, periodically broadcast by the CAP on all working sub-channels, which carries the MAC address of the CAP, so that STAs can identify the sender of the BCF. The BCF also carries system parameters.

The system parameters carried by the BCF may include various parameters that play an indicative role in the subsequent process of network access or other processes after the end of network access.

Table 4 below provides an example of the information carried in the frame body of the BCF.

Table 4

As shown in Table 4, the information carried in the BCF can be divided into the following categories:

1) The MAC address of the CAP. The STA can identify the CAP that sends the BCF according to the MAC address.

2) The working channel number and working bandwidth of the CAP. Combining the working channel number and working bandwidth here, the STA can determine other working subchannels of the CAP broadcasting the BCF except the subchannel on which the BCF is currently detected.

3) CAP antenna configuration, STA will use this parameter after successfully accessing the wireless network.

4) Network alias, indicating the name of the network, so that the STA can choose the network to join.

5) Network alias length, which indicates the length of the network alias field. The fixed length of the network alias field can save overhead and reduce parsing deviation.

6) Indicates the time stamp of the system public clock, and the STA can adjust its own clock according to the time stamp.

7) Indicates the BCF interval of the BCF broadcast cycle. After the STA obtains the system parameters for the first time, the STA needs to continuously receive the SICH and BCF to confirm that it is always in touch with the CAP. According to the BCF interval, the STA can obtain the BCF periodically.

8) Collision avoidance parameters, including: a minimum window for random access backoff and a maximum window for random access backoff, and a minimum window for scheduling request backoff and a maximum window for scheduling request backoff. According to the minimum window for random access avoidance and the maximum window for random access backoff, the STA can back off when multiple STAs collide in the subsequent random access procedure. The STA may also perform backoff when scheduling request conflicts occur according to the minimum window for scheduling request backoff and the maximum window for scheduling request backoff. A specific method for performing the backoff will be described in detail later.

9) The transmission power of the CAP. After successfully accessing the wireless network, the STA can perform open-loop power control according to the transmission power.

10) Physical frame structure parameters, including:

DGI used to indicate the conversion time of downlink and uplink, UGI used to indicate the conversion time of uplink and downlink;

The position of the downlink sounding channel used to indicate the starting position of the downlink sounding channel in the downlink transmission channel;

A downlink sounding pilot pattern used to indicate a downlink sounding pilot pattern image index;

and a demodulation pilot time domain interval for indicating the demodulation pilot time domain interval.

The physical frame structure parameters carried in the BCF frame indicate part of the structure in the physical frame. This part of the structure generally does not change when the physical frame structure is dynamically configured, so it is carried in the BCF for unified indication, so that there is no need to repeat the indication in the SICH , saving the overhead of SICH.

11) An uplink random access channel (UL-RACH) format used to indicate a random access format. In the present invention, different uplink random access channel formats are set for different random access distances to support coverage of longer distances. By indicating the format of the uplink random access channel in the BCF, the STA selection and random access Format for distance matching.

According to specific application requirements, the CAP can carry one or several items of information shown in Table 4 in the generated BCF, and then broadcast the generated BCF.

After the STA obtains system parameters on a certain sub-channel, it will transfer to the next sub-channel and continue to perform step 71 until all sub-channels in the channel list have been scanned once, and the process of obtaining synchronization is completed.

After overscanning each subchannel in the channel list, the STA may obtain system parameters on one or more subchannels, which may be working subchannels of the same CAP, or may include different The working subchannel of the CAP. The STA takes all the sub-channels for which the system parameters have been obtained as available sub-channels, and selects any one of them as the sub-channel for subsequent execution of the synchronization process and the random access process, and also determines the CAP to be accessed.

The acquisition of system synchronization in the embodiment of the present invention also includes the process of maintaining synchronization, including: continuing to search for the physical frame on the selected sub-channel; analyzing the SICH and CCH in the found physical frame; Detect BCF in the frame to obtain system parameters.

Specifically, FIG. 8 is a flowchart of STA synchronization in an embodiment of the present invention. It can be seen from Figure 8 that in the process of maintaining synchronization, the SICH timer and the BCF timer are set, and the STA continues to search for physical frames on the selected sub-channel, and starts the SICH timer and the BCF timer. If the SICH is resolved successfully before the SICH timer expires, the SICH timer is reset; if the BCF is successfully detected before the BCF timer expires, the BCF timer is reset and the physical frame is continued on the selected subchannel. When any one of the two timers expires but fails to detect the corresponding information, it is considered that the STA is out of synchronization and needs to scan the channel again. The re-scanning channel here specifically includes the following two implementation methods:

First, starting from the selected sub-channel, re-execute the process of obtaining synchronization according to the channel list, until the system parameters are obtained on a sub-channel, directly use this sub-channel as the selected sub-channel to perform the process of maintaining synchronization again , if there is still no available sub-channel after scanning the last sub-channel of the channel list, continue to scan the first sub-channel of the channel list;

Second, re-executing the process of obtaining synchronization according to the channel list is equivalent to scanning each channel in the channel list, and then selecting an available sub-channel to perform the process of maintaining synchronization again.

The above two implementation methods can be applied in the following two scenarios:

1) After the process of obtaining synchronization is completed, only one available sub-channel is determined;

2) After the synchronization acquisition process ends, if the set time is exceeded, the available sub-channels determined in the synchronization acquisition process will no longer be considered. This situation is also called channel list expiration.

Of course, the above two implementation methods are not necessarily applied in these two scenarios, and any one of the implementation methods can be used as a predetermined operation mode.

As another optional implementation manner, after the STA loses synchronization, it may use another available subchannel as the selected subchannel, and perform the process of maintaining synchronization again. This implementation method can be applied in the following application scenarios: after the process of obtaining synchronization is completed, it is determined that there are more than one available sub-channels, and the current channel list has not expired. Of course, if there is no channel list expiration limitation in the system, this implementation method can also be used as an established operation mode, and this operation can be used when more than one available sub-channel is determined when the synchronization acquisition process is executed for the first time model.

The timing duration of the SICH timer and the BCF timer can be flexibly set according to application requirements.

It can be seen that maintaining synchronization is a process in which the STA continuously searches for physical frames on the selected sub-channel, and continuously analyzes the SICH and detects the BCF. Since the SICH indicates the structure of the physical frame to which it belongs, the STA can use the analysis result of the current SICH to know the start time of the next physical frame during the process of maintaining synchronization.

As an optional embodiment, FIG. 9 is a flow chart of a random access method in an embodiment of the present invention, and the process includes:

Step 91: Send a random access sequence to the CAP on any subchannel.

The purpose of sending the random access sequence is to request the CAP for uplink transmission resources for sending the random access request.

Any sub-channel here refers to an available sub-channel determined by the STA after the aforementioned process of obtaining system synchronization. The selection of this channel is arbitrary. Therefore, multiple STAs can be dispersed in different sub-channels. A random access sequence is sent to avoid competition in a subchannel, reduce the probability of collision, and improve the success rate of accessing the wireless network.

When sending the random access sequence, it goes through the process shown in Figure 10, where CAP_MAC refers to the lowest 7 bits of the MAC address of the CAP, i is the PN sequence index (0≤i<4), and {δ _CS } is the cyclic shift parameter set, j is the index of the cyclic shift parameter (0≤j<8). The random access sequence is sent in the uplink random access channel in the physical frame, using the format of the uplink random access channel indicated in the BCF.

Figures 11a to 11c show the formats of three optional uplink random access channels in the embodiment of the present invention, corresponding to the example of BCF given in Table 4, the selection of the format of the uplink random access channel includes the following situations:

When 00 is indicated in the UL-RACH channel format field in the BCF, the channel format in Figure 11a is used, and {δ _CS }={0 1.6us 3.2us 4.8us 6.4us 8.0us 9.6us 11.2us};

When 01 is indicated in the UL-RACH channel format field in the BCF, the channel format in Figure 11b is used, at this time {δ _CS }={0 3.2us 6.4us 9.6us};

When 10 is indicated in the UL-RACH channel format field in the BCF, the channel format in Figure 11c is used, and {δ _CS }={0 6.4us} at this time.

Step 92: The CAP indicates the uplink transmission resource allocated according to the random access sequence.

The CAP uses broadcast signaling to indicate allocated uplink transmission resources, and Table 5 below shows examples of bits in the broadcast signaling and their indication meanings. Among them, allocation 1 and allocation 2 correspond to a STA respectively. Taking allocation 1 as an example, the STA identifies the broadcast type through the value of b ₃ b ₂ b ₁ b ₀ to allocate resources for the random access request frame, and the STA uses the random access sequence index The three items of frequency domain cyclic shift index of the random access sequence and the lowest 3 bits of the system frame number where the random access occurs are searched for the uplink transmission resource corresponding to itself from the broadcast signaling.

The PN sequence in Table 5 refers to a random access sequence, and the signaling/feedback channel is a channel used to transmit signaling and perform feedback in the transmission channel.

The transmission timing advance in Table 5 indicates the amount of timing advance that the STA needs to perform during uplink transmission. When the STA sends all uplink frames subsequently, it advances the timing according to the transmission timing advance.

table 5

If the STA has not received the resource allocation information indicating the uplink transmission resources from the CAP after sending the random access sequence, after exceeding the maximum waiting frame interval of the random access, it considers that the random access failed this time, and needs to perform the random access process again, that is Resend the random access sequence on the current subchannel.

The frame number timing is used here, which is more accurate than the timer timing.

The above-mentioned time for resending the random access sequence is related to random access backoff.

The binary exponential backoff algorithm is used to deal with collision conflicts, and the complete processing flow is described through the following steps:

SS1: When the STA sends a random access sequence, set its internal backoff window equal to the minimum window CW _min of the random access backoff carried in the BCF frame;

SS2: STA sends a random access sequence on the random access channel of any subchannel;

SS3: The STA waits for the resource allocation information for the random access request in the subsequent CCH, that is, the allocation information of the uplink transmission resources carried in the above-mentioned broadcast signaling;

SS4: If the STA receives the resource allocation information, the processing process ends, indicating that there is no contention conflict;

SS5: If no resource allocation information for random access request is detected in the CCH within the random access maximum waiting frame interval, the STA considers a contention conflict;

SS6: The STA will randomly select a backoff value between [0 2 ^m+1 CW _min ] (the backoff window is not larger than the maximum backoff window), and the backoff unit is one frame, where m represents the number of retransmissions;

SS7: The STA resends the random access sequence after the backoff counter is 0.

The above four steps SS4-SS7 are repeated until the maximum number of random access retries is reached.

Step 93: Using the uplink transmission resources allocated by the CAP, send a random access request frame to the CAP.

The random access request in the present invention is encapsulated in the random access request frame, and Table 6 below provides an example of information carried in the frame body of the random access request frame.

Table 6

As shown in Table 6, the information carried in the frame body of the random access request frame includes the following:

1) The MAC address of the STA, so that the CAP can identify the STA that sent the random access request frame; the CAP will save the unique identifier of the STA for subsequent allocation of a temporary identifier and a formal identifier within the scope of the CAP for the STA.

2) The MAC address of the CAP, so that the CAP can identify itself as the receiver of the random access request frame;

3) Power control parameters, including: power adjustment margin and STA current transmit power. STAs need to perform closed-loop power control, often through a separate power adjustment process. In the embodiment of the present invention, the power control parameter is carried in the random access request frame, which will enable the STA to perform closed-loop power control during the random access process. .

The STA may generate a random access request frame and carry one or more of the information shown in Table 6, and then send the generated random access request frame.

If the STA still does not receive the random access response frame after sending the random access request frame, exceeding the maximum waiting frame interval of the random access response, it considers that the random access failed this time, and needs to perform the random access procedure again, that is, restart the random access response frame. Step 91 is executed, at this time, the random access sequence is resent on the current subchannel, and the time of resending is related to the random backoff introduced above.

Step 94: Receive the random access response frame sent by the CAP.

The CAP indicates to the STA the downlink transmission resource for sending the random access response frame through broadcast signaling. Table 7 gives an example of each bit in the broadcast signaling and its meaning. Allocation 1 to allocation 3 in Table 7 correspond to one STA respectively. Taking allocation 1 as an example, the STA identifies the broadcast type through b ₃ b ₂ b ₁ b ₀ to allocate resources for the random access response frame, and the STA uses the random access sequence index , the frequency-domain cyclic shift index of the random access sequence, and the lowest 3 bits of the system frame number where the random access occurs to determine the downlink transmission resource corresponding to its own random access response frame. The PN sequence in Table 7 refers to a random access sequence, and the signaling/feedback channel refers to a channel for transmitting downlink signaling and feedback for uplink services in the downlink transmission channel.

Table 7

The encapsulation of the random access response in this embodiment is implemented in the random access response frame. Corresponding to the example of the information carried in the random access request frame given in Table 6, the following Table 8 provides an example of the information carried in the frame body of the corresponding random access response frame.

Table 8

As shown in Table 8, the information carried in the random access response frame includes the following:

1) The MAC address of the STA. After receiving the random access response frame, if the STA finds that the MAC address of the STA carried therein does not match its own address, it will resend the random access sequence.

2) The temporary identifier TSTA ID assigned to the STA within the scope of the CAP is used to identify the STA before successfully accessing the wireless network and assigning a formal identifier within the scope of the CAP to the STA. For example, the resource indication broadcast information in the capability negotiation phase In the order, TSTA ID is used to identify the uplink transmission resources allocated by the CAP to the STA. Since the STA may not be able to successfully access the wireless network due to various reasons, if the STA is assigned a formal identity within the range of the CAP in the random access phase, identity resources will be wasted. In order to meet the needs of identifying STAs without wasting identification resources, here we choose to assign temporary identities to STAs. The temporary identities can correspond to a recovery period, which is longer than the time required for STAs to complete network access. Assume that STAs access the wireless network If the subsequent process fails, the temporary identifier assigned to the STA will be withdrawn after the recovery period is reached.

3) The power control parameter adjustment value, indicating how the STA should adjust the power control parameter. The CAP determines the adjustment value according to the power control parameter carried in the random access request. Specifically, the CAP determines the power control parameter adjustment value according to the adjustment margin carried in the random access request.

4) Access status, indicating STA success or abort.

The CAP determines the access state according to the measurement result of the uplink signal, for example, the access state may be determined according to information such as signal quality of the uplink channel.

When the signal quality is within an acceptable range, the CAP determines the access status as successful.

When the signal quality is not within the acceptable range, the CAP determines the access state as giving up, and this random access fails.

When the access state indicates abandonment, the random access response frame does not carry the TSTA ID, or the TSTA ID is set as invalid data.

The STA may generate a random access response frame and carry one or more of the information shown in Table 8, and then send the generated random access response frame.

As an optional embodiment, if power control is not required in some application scenarios, for example, the power control parameters of STAs in the system are fixed, at this time the random access request does not need to carry power control parameters, and the corresponding , and the CAP does not need to determine the adjustment value of the power control parameter.

In the embodiment of the random access method of the present invention, after receiving the random access sequence sent by the STA, if the CAP does not receive the random access request frame sent by the STA after waiting for the maximum waiting frame interval for random access, it can also delete the sequence. All the information corresponding to the STA, or delete the information corresponding to the random access sequence of the STA.

As an optional embodiment, FIG. 12 is a flowchart of a method for capability negotiation in an embodiment of the present invention, and the process includes:

Step 121: The CAP allocates uplink transmission resources.

In this step, after the random access is completed, the CAP will proactively allocate uplink transmission resources to the STA, and send an indication of allocation of the uplink transmission resources to the STA. The above allocation indication may be broadcast signaling, in which the TSTAID of the STA is used to identify the uplink transmission resource allocated to it. The STA uses its own TSTA ID to find out the uplink transmission resource allocated by the CAP for itself from the above broadcast signaling, and uses the uplink transmission resource to send a terminal basic capability negotiation request.

Optionally, after receiving the random access response sent by the CAP, the STA can wait for the maximum waiting frame interval of the basic capability negotiation request frame of the terminal. If the STA does not receive an instruction to allocate uplink transmission resources from the CAP, it considers that the capability negotiation has failed. , the random access process needs to be re-executed.

Step 122: Send a terminal basic capability negotiation request frame (SBC-REQ) to the CAP.

The terminal basic capability negotiation request in this embodiment is encapsulated in the terminal basic capability negotiation request frame. Table 9 below provides an example of information carried in the frame body of the terminal basic capability negotiation request frame.

Table 9

As shown in Table 9, the information carried in the frame body of the terminal basic capability negotiation request frame includes the following:

1) The number of antennas of the STA, which will be used in the process after accessing the wireless network.

2) The maximum working bandwidth of the STA. The STA reports its own maximum working bandwidth. The maximum working bandwidth can be used as one of the bases for the CAP to determine the target subchannel to be switched by the STA.

3) The STA supports spectrum aggregation, and the CAP can know the situation that the STA supports spectrum aggregation through this parameter. In the embodiment of the present invention, both STA and CAP may support 20MHz, 40MHz and 80MHz bandwidth, and the system includes four 20MHz sub-channels. Spectrum aggregation mode 1 means that 20MHz, 40MHz and 80MHz STAs can be scheduled in one or more 20MHz sub-channels. Independent transmission on the channel. Spectrum aggregation mode 2 represents the aggregation of multiple continuous sub-channels with continuous spectrum. 40MHz and 80MHz STAs can continuously transmit in the frequency domain on the aggregated channel.

4) The scheduling mechanism supported by the STA, through which the CAP can know the situation of the scheduling mechanism supported by the STA.

5) STA working subchannel mapping. This parameter indicates the available subchannels selected by the STA during the process of obtaining system synchronization. These subchannels can be used as one of the basis for the CAP to determine the target subchannel to be switched by the STA.

6) The maximum number of STA transmit streams and the maximum number of STA receive streams. Through this parameter CAP, you can know the number of transmit streams and receive streams supported by the STA.

7) An MCS indication indicating the MCS capability of the STA, through which the CAP can know the MCS capability of the STA.

8) STA UEQM capability indication indicating the unequal modulation (UEQM) capability of the STA, through which the CAP can know the UEQM capability of the STA. The non-equal modulation here refers to adopting different modulation modes for different service streams.

9) LDPC capability indication indicating the LDPC capability of the STA, through which the CAP can know the LDPC capability of the STA.

10) An STBC capability indicator indicating the STA's space-time coding capability, through which the CAP can know the STBC capability of the STA.

11) The MU-MIMO indication of the STA indicating the MU-MIMO capability of the STA, through which the CAP can know the MU-MIMO capability of the STA.

12) The subcarrier grouping Ns feedback capability is the number of subcarriers supported by the STA to report to the CAP between two feedbacks.

13) The combination of MIMO feedback modes supported by the STA is that the STA reports the combination of MIMO feedback modes it supports to the CAP.

14) Uplink signaling/feedback channel format 2 support indication, where the uplink signaling/feedback channel format 2 indicates an uplink signaling/feedback channel that supports frequency division.

15) STA's DGI requirement indication and STA's UGI requirement indication.

The above terminal basic capability negotiation request frame carries a variety of parameters used for physical layer mode negotiation, including STA support spectrum aggregation, STA support scheduling mechanism, STA maximum number of transmit streams and STA maximum receive streams, STA UEQM capability indication, STA MU-MIMO indication, uplink signaling/feedback channel format 2 support indication, STA DGI demand indication, and STA UGI demand indication. This is because there are many physical layer modes in the EUHT system, and the physical layer mode is performed during the capability negotiation phase. Negotiation, which is beneficial to constrain the complexity of implementation.

After the STA generates the terminal basic capability negotiation request frame, it can carry one or several parameters in Table 9 according to application requirements, and then send the terminal basic capability negotiation request frame.

Optionally, after sending the terminal basic capability negotiation request frame, you can wait for the maximum waiting frame interval of the terminal basic capability negotiation response frame. If the terminal basic capability negotiation response frame is not received, it is considered that the capability negotiation failed this time and needs to be repeated. random access process.

Step 123: Receive the terminal basic capability negotiation response frame (SBC-RSP) sent by the CAP.

Before sending the basic capability negotiation response frame of the terminal, the CAP will indicate the downlink transmission resources for receiving the basic capability negotiation response of the terminal.

In this embodiment, the terminal basic capability negotiation response is encapsulated in the terminal basic capability negotiation response frame. Table 10 below provides an example of information carried in the frame body of the terminal basic capability negotiation response frame.

Table 10

As shown in Table 10, the information carried in the frame body of the terminal basic capability negotiation response frame includes the following:

1) The official STA ID assigned to the STA within the scope of the CAP. After successfully entering the network, the STA will use this STAID to interact with the CAP, and the TSTA ID assigned during the random access phase becomes invalid.

2) Working subchannel mapping, indicating the target subchannel to which the STA will switch. The CAP can determine this parameter according to the STA maximum working bandwidth and the STA working subchannel mapping in the basic capability request frame of the terminal. Furthermore, the CAP can adjust the maximum working bandwidth reported by the STA according to the actual channel load and other conditions. For example, the maximum working bandwidth reported by the STA is 80MHz, and the CAP can adjust it to 40MHz or 20MHz according to the actual situation. CAP determines as much as possible the subchannel indicated by the STA working subchannel mapping in the basic capability negotiation request frame of the terminal as the target subchannel to be switched by the STA, and also refers to the maximum working bandwidth of the STA or the adjusted maximum working bandwidth of the STA, The final working subchannel mapping information is determined.

3) Spectrum aggregation mode, indicating the relationship between the target subchannels in the working subchannel mapping, where the spectrum aggregation mode is determined according to the STA support spectrum aggregation carried in the terminal basic capability negotiation request frame.

4) The scheduling mechanism is determined according to the scheduling mechanism supported by the STA carried in the terminal basic capability negotiation request frame.

5) MCS indication information, UEQM indication information, LDPC indication information, Tx STBC information and Rx STBC information are respectively determined according to various parameters carried in the terminal basic capability negotiation request frame. For example, suppose the STA supports 256QAM, but the CAP does not support 256QAM, then the CAP will not allow the STA to support 256QAM.

6) The maximum number of STA transmit streams and the maximum number of STA receive streams are respectively determined according to the maximum number of STA transmit streams and the maximum number of STA receive streams carried in the terminal basic capability negotiation request frame.

7) MU-MIMO, determined according to the MU-MIMO supported by the STA carried in the terminal basic capability negotiation request frame.

8) The subcarrier group Ns feedback capability is determined according to the subcarrier group Ns feedback capability carried in the terminal basic capability negotiation request frame, and the STA can perform feedback every few subcarriers, saving feedback overhead.

9) The supported MIMO feedback mode combination is determined according to the MIMO feedback mode combination supported by the STA carried in the terminal basic capability negotiation request frame, and multiple MIMO feedback modes can be used.

10) Uplink signaling/feedback channel format 2, STA DGI requirements and STA UGI requirements are respectively determined according to the corresponding parameters carried in the terminal basic capability negotiation request frame.

After the CAP generates the terminal basic capability negotiation response frame, it can carry one or more parameters in Table 10 according to application requirements, and then sends the terminal basic capability negotiation response frame.

In order for the CAP to know whether the STA has correctly received the terminal basic capability negotiation response frame, the STA may send an acknowledgment to the CAP when receiving it correctly, and the STA may send an ACK. Or, the embodiment of the present invention proposes a group acknowledgment (GroupAck) method, the group acknowledgment frame includes a management control frame indication bit, and also includes a bitmap (bitmap) corresponding to different service flows of the same user, where the STA can be in the above management control frame Fill in the indication bit to indicate whether the basic capability negotiation response of the terminal is received correctly or not. When subsequently performing data transmission based on service flows, the STA can use the bitmap in the group acknowledgment frame to send acknowledgments for different service flows to the CAP together.

Optionally, after sending the terminal basic capability negotiation response frame, the CAP waits for the maximum waiting frame interval for the confirmation of the terminal basic capability negotiation response frame. If no confirmation returned by the STA is received, the capability negotiation fails.

Further, in the process of waiting for the maximum waiting frame interval for confirmation of the terminal basic capability negotiation response frame, if the CAP has remaining downlink resources that can be allocated to the STA, it can resend the terminal basic capability negotiation response frame to the STA. In the case of retransmitting the basic capability negotiation response frame of the terminal, the CAP will wait for the maximum waiting frame interval for the confirmation of the basic capability negotiation response frame of the terminal only after sending the basic capability negotiation response frame of the terminal for the first time.

After the capability negotiation ends, the STA will switch to the target subchannel indicated by the CAP.

The present invention provides two means for data transmission.

FIG. 13 is a schematic structural diagram of the first device for data transmission in the present invention, which includes: a generating unit 131 and a sending unit 132 .

The generating unit 131 is configured to generate a broadcast information frame BCF, where the BCF carries physical layer parameters indicating the configuration of the physical frame structure.

A sending unit 132, configured to send the BCF.

Wherein, the physical layer parameters include one or more of the following: downlink sounding pilot pattern; position of downlink sounding channel; demodulation pilot time domain period indicating the number of OFDM symbols of demodulation pilot time domain interval; indication The downlink guard interval DGI of the transition time between downlink and uplink; the uplink guard interval indicating the transition time of uplink and downlink.

The second device for data transmission in the present invention has the same structure as the above-mentioned first device for data transmission, and also includes a generating unit and a sending unit, but the functions of each unit are different, wherein the generating unit is used to generate BCF, the BCF carries the working channel and the working bandwidth of the CAP, for the STA to determine other working sub-channels of the CAP except the current resident sub-channel, and the sending unit is used to send the BCF.

Corresponding to the flow of accessing the wireless network in the method embodiment of the present invention, the following provides optional embodiments of the terminal-side device, the network-side device and the devices in the two devices accessing the wireless network.

FIG. 14 is a schematic structural diagram of a terminal-side device for accessing a wireless network in the present invention. The device includes: a device 141 for obtaining system synchronization, a random access terminal-side device 142 and a capability negotiation terminal-side device 143 .

The device 141 for obtaining system synchronization is configured to execute the process of obtaining system synchronization with the CAP.

The random access terminal side device 142 is configured to randomly access the above-mentioned CAP.

The capability negotiation terminal side device 143 is configured to perform capability negotiation with the above-mentioned CAP.

The device for obtaining system synchronization in the present invention includes: a module for obtaining synchronization, and the module for obtaining synchronization includes: a first detection unit, a first analysis unit, and a first acquisition unit.

The first detection unit is configured to search for a physical frame on the current subchannel.

The first analysis unit is configured to analyze the SICH and CCH in the physical frame found by the first detection unit, wherein the SICH indicates the structure of the physical frame, and the CCH indicates the allocation of system resources.

The first obtaining unit is configured to use the result analyzed by the first analyzing unit to obtain system parameters from the physical frame found by the first detecting unit.

Fig. 15 is a schematic structural diagram of a device for obtaining system synchronization in an embodiment of the present invention, the device includes: a module 151 for obtaining synchronization, and the module 151 for obtaining synchronization includes: a first detection unit 1511, a first analysis unit 1512 and a first Acquiring unit 1513.

The first detection unit 1511 is configured to search for a physical frame on the current subchannel.

The first analysis unit 1512 is configured to analyze the SICH and CCH in the physical frame found by the first detection unit 1511, wherein the SICH indicates the structure of the physical frame, and the CCH indicates the allocation of system resources.

The first acquiring unit 1513 is configured to use the result analyzed by the first analyzing unit 1512 to acquire system parameters from the physical frame found by the first detecting unit 1511 .

Further, after acquiring the system parameters, the first acquiring unit 1513 may trigger the first detecting unit 1511 to shift to the next subchannel and continue searching for physical frames until each subchannel in the predetermined channel list is traversed.

Still further, the first obtaining unit 1513 may use all sub-channels for which system parameters have been obtained as available sub-channels, and select any sub-channel from them.

As an optional embodiment, the first detecting unit 1511 searches for the physical frame by detecting a frame header of the physical frame on the current subchannel.

Further, when no frame header is detected on the current subchannel, the first detection unit 1511 continues to perform detection until the waiting time of the subchannel is exceeded, and transfers to the next subchannel to continue searching for the physical frame.

As an optional embodiment, when the first parsing unit 1512 fails to parse the SICH and CCH, the first detecting unit 1511 is triggered to continue to perform operations until the waiting time of the sub-channel is exceeded, and the first detecting unit 1511 is triggered to transfer to the next A subchannel continues to look for physical frames.

As an optional embodiment, the first acquiring unit 1513 detects the broadcast information frame BCF from the physical frame, and then acquires the system parameter from the BCF.

Further, when the first acquisition unit 1513 does not detect the BCF, the first detection unit 1511 is triggered to continue to perform operations until the waiting time of the sub-channel is exceeded, the first detection unit 1511 is triggered to transfer to the next sub-channel to continue searching for physical frames.

Based on the module 151 for obtaining synchronization, the device for obtaining system synchronization in the embodiment of the present invention further includes a module 152 for maintaining synchronization. The module 152 for maintaining synchronization includes: a second detection unit 1521 , a second analysis unit 1522 and a second acquisition unit 1523 .

The second detecting unit 1521 is configured to continue searching for physical frames on the selected subchannel.

The second analyzing unit 1522 is configured to analyze the SICH and CCH in the physical frame searched by the second detecting unit 1521 .

The second acquiring unit 1523 is configured to use the analysis result of the second analyzing unit 1522 to detect the BCF from the physical frame searched by the second detecting unit 1521 to acquire system parameters.

As a first optional embodiment of the module 152 for maintaining synchronization, the module 152 for maintaining synchronization further includes: a SICH timer 1524 , a BCF timer 1525 and a judging unit 1526 .

The second detecting unit 1521 further starts a SICH timer 1524 and a BCF timer 1525 when starting to search for a physical frame.

The judging unit 1526 is configured to judge whether the second parsing unit 1522 successfully parses the SICH before the SICH timer 1524 expires, if yes, reset the SICH timer 1524, otherwise trigger the module 151 for obtaining synchronization to re-execute the operation according to the channel list; Judging whether the second acquisition unit 1523 detects BCF before the BCF timer 1525 expires, if yes, resets the BCF timer 1525, and triggers the second detection unit 1521 to continue searching for physical frames on the selected sub-channel, otherwise triggers acquisition The synchronized module 151 re-executes operations according to the channel list.

As a second optional embodiment of the synchronization maintaining module 152, as shown in FIG.

The second detecting unit 1521 further starts a SICH timer 1524 and a BCF timer 1525 when starting to search for a physical frame.

The judging unit 1526 is used to judge whether the second parsing unit 1522 successfully parses the SICH before the SICH timer 1524 expires, if yes, reset the SICH timer 1524, otherwise the module 151 for triggering synchronization takes the selected subchannel as the starting point, And re-execute the operation according to the channel list; judge whether the second acquisition unit 1523 detects the BCF before the BCF timer 1525 expires, if so, reset the BCF timer 1525, and trigger the second detection unit 1521 in the selected channel Continue to search for physical frames on the channel, otherwise trigger the module 151 for acquiring synchronization to start from the selected sub-channel and re-execute the operation according to the channel list.

On this basis, the first obtaining unit 1513 further, in the process of re-executing the operation, after obtaining the system parameters on a sub-channel, directly triggers the synchronization-maintaining module 152 to use this sub-channel as the selected sub-channel to re-execute the operation .

As a third optional embodiment of the synchronization maintaining module 152, as shown in FIG.

The second detecting unit 1521 further starts a SICH timer 1524 and a BCF timer 1525 when starting to search for a physical frame.

The judging unit 1526 is used to judge whether the second parsing unit 1522 successfully parses the SICH before the SICH timer 1524 expires, if yes, reset the SICH timer 1524, otherwise trigger the first acquiring unit 1513 to reselect one of the available subchannels ; Judge whether the second acquisition unit 1523 detects the BCF before the BCF timer 1525 expires, if so, reset the BCF timer 1525, and trigger the second detection unit 1521 to continue searching for the physical frame on the selected subchannel, otherwise trigger The first obtaining unit 1513 reselects one of the available sub-channels.

In the above three optional embodiments based on the module 152 for maintaining synchronization, if considering the limitation of application scenarios where the channel list is expired, the device for obtaining system synchronization may also include a module for determining whether the channel list is expired, which can monitor and obtain synchronization The operation of the module 151 starts counting after it finishes scanning the channel list, and when the set time is reached, the result that the channel list expires is obtained. Or, if the terminal itself has a module for determining whether the channel list is expired, the synchronization maintaining module 152 can directly use the result obtained by the module to determine whether the channel list is expired.

In the above three optional embodiments of the synchronization maintaining module 152, the second detection unit 1521 may use the found SICH in the current physical frame on the selected subchannel to determine the start time of the next physical frame.

The same synchronized module can integrate the structures and functions of the three embodiments shown in FIG. 15 and FIG. 16 .

In order to establish time synchronization with the CAP, the apparatus for obtaining system synchronization in the embodiment of the present invention may further include: a synchronization unit, which establishes synchronization with the CAP by using the system common clock in the system parameters.

The first random access terminal side device provided by the present invention includes: a resource request unit, a random access request unit, and a random access response receiving unit.

The resource request unit is configured to send a random access sequence on any sub-channel.

The random access request unit is configured to use the uplink transmission resources allocated by the CAP according to the random access sequence to send a random access request to the CAP.

The random access response receiving unit is configured to receive the random access response sent by the CAP.

As an optional embodiment, FIG. 17 is a schematic structural diagram of the first random access terminal side device in the embodiment of the present invention, which includes: a resource request unit 171, a random access request unit 172, a random access A response receiving unit 173 , a first triggering unit 174 , a power control parameter reporting unit 175 , a resource indication receiving unit 176 , a second triggering unit 177 and a power control parameter adjusting unit 178 .

The resource request unit 171 is configured to send a random access sequence on any sub-channel; receive an indication of the uplink transmission resource from the CAP within the set number of frames after sending the random access sequence, if no indication of the uplink transmission resource is received, Resend the random access sequence. The indication of the uplink transmission resource here is carried in the system signaling, and is identified by the index of the random access sequence, the index of the frequency domain cyclic shift of the random access sequence, and the system frame number where the random access occurs. Further, the indication of the uplink transmission resource also carries a transmission timing advance.

The random access request unit 172 is configured to use the uplink transmission resource allocated by the CAP according to the random access sequence to send a random access request to the CAP. When sending the random access request to the CAP, the random access request unit 172 will advance the timing according to the transmission timing advance.

The random access response receiving unit 173 is configured to receive the random access response sent by the CAP. Further, the random access response may carry an access status indicating success or abort, and when the access status indicates success, the random access response may also carry a temporary identifier allocated within the scope of the CAP for the STA to which the device belongs.

The first trigger unit 174 is configured to monitor the random access response receiving unit 173 within the set number of frames after the random access request unit 172 sends the random access request, if the random access response receiving unit 173 does not receive the random access response The access response triggers the resource request unit 171 to send a random access sequence.

The power control parameter reporting unit 175 is configured to notify the power control parameter reported by the random access request unit 172 for it to carry and send in the random access request.

The resource indication receiving unit 176 is configured to receive an indication from the CAP of the downlink transmission resource for sending the random access response. Here, the indication of the downlink transmission resource is carried in the system signaling, and is identified by the index of the random access sequence, the index of the frequency domain cyclic shift of the random access sequence, and the system frame number where the random access occurs.

The second triggering unit 177 is configured to compare the address carried in the random access response with the address of the STA to which it belongs, and if they do not match, trigger the resource requesting unit 171 to resend the random access sequence to the CAP.

The power control parameter adjustment unit 178 is configured to adjust the power control parameter according to the power control parameter adjustment value in the random access response.

The first type of random access terminal side device in the embodiment of the present invention may include all the units shown in Figure 17 inside, but may also include only some of the units shown in Figure 17 according to different application requirements, so the 17 only gives an example of a structure of the device at the random access terminal side, and does not limit its structure.

The second random access terminal side provided by the present invention includes: a random access request unit and a random access response receiving unit.

The random access request unit is configured to send a random access request carrying power control parameters to the CAP.

The random access response receiving unit is configured to receive the random access response sent by the CAP.

Further, the second random access terminal side device of the present invention may further include: a resource request unit, configured to send a random access sequence to the CAP on any subchannel, so as to request an uplink transmission resource for sending the random access request .

As an optional embodiment, the second random access terminal side device of the present invention may have an internal structure similar to that shown in Figure 17, but there is no separate power control parameter reporting unit, and the random access request unit Directly send the random access request carrying the power control parameters, and the functions of other units are the same.

The capability negotiation terminal side device in the present invention includes: a capability negotiation request unit and a capability negotiation response receiving unit.

The capability negotiation request unit is configured to use the uplink transmission resource allocated by the CAP to send a terminal basic capability negotiation request to the CAP.

The capability negotiation response receiving unit is configured to receive a terminal basic capability negotiation response carrying working subchannel mapping information sent by the CAP. The above working subchannel mapping information indicates the target subchannel to be switched by the STA.

FIG. 18 is a schematic structural diagram of a capability negotiation terminal side device in an embodiment of the present invention. The device includes: a capability negotiation request unit 181, a capability negotiation response receiving unit 182, a confirmation unit 183, a first trigger unit 184, a second trigger unit 185, and a capability negotiation response receiving unit 182. Configuration parameter providing unit 186 .

The capability negotiation requesting unit 181 is configured to receive the allocation instruction of the uplink transmission resources; send a basic terminal capability negotiation request to the CAP by using the uplink transmission resources allocated by the CAP.

The capability negotiation response receiving unit 182 is configured to receive the terminal basic capability negotiation response carrying the working subchannel mapping information sent by the CAP. The above working subchannel mapping information indicates the target subchannel to be switched by the STA. Further, the terminal basic capability negotiation response may also carry spectrum aggregation mode information and/or a formal identifier, where the spectrum aggregation mode information is used to indicate the relationship between the target subchannels, and the formal identifier is that the STA is within the range of the CAP Assigned official ID.

The confirmation unit 183 is configured to send a confirmation to the CAP after the capability negotiation response receiving unit 182 correctly receives the basic capability negotiation response of the terminal.

The first triggering unit 184 is configured to monitor the capability negotiation request unit 181 within a set number of frames after the random access terminal device completes the operation, and trigger the random access if the capability negotiation request unit 181 does not receive an indication of uplink transmission resources The terminal side device executes the operation again.

The second trigger unit 185 is configured to monitor the capability negotiation response receiving unit 182 within the set number of frames after the capability negotiation request unit 181 sends the terminal basic capability negotiation request, and if the capability negotiation response receiving unit 182 does not receive the terminal basic capability negotiation response , triggering the device at the random access terminal side to re-execute the operation.

The configuration parameter providing unit 186 is configured to provide the maximum working bandwidth of the STA to the capability negotiation requesting unit 181 for sending in the terminal basic capability negotiation request. Further, the configuration parameter providing unit 186 is also configured to provide the subchannel information available to the STA to the capability negotiation requesting unit 181 for sending in the basic capability negotiation request of the terminal.

The capability negotiation terminal side device in the embodiment of the present invention may include all the units shown in Figure 18 inside, but may also include only some of the units shown in Figure 18 according to different application requirements, so Figure 18 only shows An example of the structure of the capability negotiating terminal device is given, and the structure is not limited.

FIG. 19 is a schematic structural diagram of a network-side device for accessing a wireless network in the present invention. The device includes: a system parameter sending device 191 , a random access network-side device 192 and a capability negotiation network-side device 193 .

The system parameter sending unit 191 is configured to send system parameters.

The random access network-side device 192 is configured to allow random access of terminal-side devices.

The capability negotiation network-side device 193 is configured to perform capability negotiation with the terminal-side device.

The first random access network side device provided by the present invention includes: a resource allocation unit, a random access request receiving unit, and a random access response unit.

The resource allocation unit is configured to receive a random access sequence sent by an STA on any subchannel, and allocate uplink transmission resources according to the random access sequence.

The random access request receiving unit is configured to receive a random access request sent by the STA using the uplink transmission resource.

The random access response unit is configured to send a random access response to the STA.

As an optional embodiment, FIG. 20 is a schematic structural diagram of the first random access wireless network side device in the embodiment of the present invention, the device includes: a resource allocation unit 201, a random access request receiving unit 202, a random access An incoming response unit 203, a deletion unit 204, an access state determination unit 205, a temporary identifier allocation unit 206, and a power control parameter adjustment value determination unit 207.

The resource allocation unit 201 is configured to receive the random access sequence sent by the STA on any subchannel, and allocate uplink transmission resources according to the random access sequence; send an indication of the uplink transmission resources; respond to the random access Allocating downlink transmission resources, and sending the indication of downlink transmission resources. Here, the indication of the uplink transmission resource is carried in the system signaling, and is identified by the index of the random sequence, the index of the frequency domain cyclic shift of the random access sequence, and the system frame number where the random access occurs. Further, the indication of the uplink transmission resource also carries a transmission timing advance, which indicates the timing advance during uplink transmission. Here, the indication of the downlink transmission resource is carried in the system signaling, and is identified by the index of the random access sequence, the index of the frequency domain cyclic shift of the random access sequence, and the system frame number where the random access occurs.

The random access request receiving unit 202 is configured to receive the random access request sent by using the uplink transmission resource.

The random access response unit 203 is configured to send a random access response to the STA.

The deletion unit 204 is configured to monitor the random access request receiving unit 202 within a set number of frames after the resource allocation unit 201 receives the random access sequence sent by the STA, if the random access request receiving unit 202 does not receive the random access sequence The random access request sent by the STA, delete all information corresponding to the STA, or delete information corresponding to the random access sequence.

The access state determination unit 205 is configured to determine the access state of the STA as successful or abandoned according to the measurement result of the uplink signal, and send the access state to the random access response unit 203 for it to be carried in the random access response sent in.

The temporary identifier allocation unit 206 is configured to allocate a temporary identifier for the STA within its own range when the access status determination unit 205 determines that the access status indication is successful, and send the temporary identifier to the random access response unit 203 for its carried in the random access response.

The power control parameter adjustment value determining unit 207 is configured to determine the power control parameter adjustment value according to the reported power control parameter carried in the random access request received by the random access request receiving unit 202, and send the power control parameter adjustment value to The random access response unit 203 is used for carrying it and sending it in the random access response.

The random access network side device in the embodiment of the present invention may include all the units shown in Figure 20 inside, but may also include only some units shown in Figure 20 according to different application requirements, so Figure 20 only shows An example of the structure of the random access network side device is given, and the structure is not limited.

The second random access network side device provided by the present invention includes: a random access request receiving unit and a random access responding unit.

The random access request receiving unit is configured to receive a random access request carrying power control parameters sent by an STA.

The random access response unit is configured to send a random access response to the STA.

Further, the second random access network side device of the present invention may further include: a resource allocation unit, configured to receive a random access sequence sent by an STA on any subchannel, and allocate and send the random access sequence according to the random access sequence The uplink transmission resource of the random access request.

As an optional embodiment, the internal structure of the second random access network side device provided in the embodiment of the present invention is the same as that shown in FIG. 20 , and the functions of each unit are also similar.

The capability negotiation network side device in the present invention includes: a capability negotiation request receiving unit and a capability negotiation response unit.

The capability negotiation request receiving unit receives a terminal basic capability negotiation request sent by an STA using allocated uplink transmission resources.

The capability negotiation response unit sends a terminal basic capability negotiation response carrying working subchannel mapping information, where the working subchannel mapping information indicates the target subchannel to be switched by the STA.

Figure 21 is a schematic structural diagram of a capability negotiation network side device in an embodiment of the present invention, the device includes: a capability negotiation request receiving unit 211, a capability negotiation response unit 212, an acknowledgment receiving unit 213, a monitoring unit 214, a resource allocation unit 215, a working subunit A channel mapping information determining unit 216 , a spectrum aggregation mode information providing unit 217 , and a formal identifier assigning unit 218 .

The capability negotiation request receiving unit 211 receives the terminal basic capability negotiation request sent by the STA using the allocated uplink transmission resource.

The capability negotiation response unit 212 sends a terminal basic capability negotiation response carrying working subchannel mapping information, where the working subchannel mapping information indicates the target subchannel to be switched by the STA.

The acknowledgment receiving unit 213 is configured to receive the acknowledgment sent by the STA after correctly receiving the terminal basic capability negotiation response.

The monitoring unit 214 is configured to monitor the confirmation receiving unit 213 within a set number of frames after the capability negotiation response unit 212 sends the terminal basic capability negotiation response, and if the confirmation receiving unit 213 does not receive the confirmation, notify the capability negotiation request receiving unit 211 End this operation with the capability negotiation response unit 212 . Further, before being triggered by the monitoring unit 214, the capability negotiation response unit 212 may resend the terminal basic capability negotiation response to the STA.

The resource allocation unit 215 is configured to allocate an uplink transmission resource for the STA to send a terminal basic capability negotiation request, and send an allocation instruction of the uplink transmission resource.

The working subchannel mapping information determination unit 216 is configured to determine the working subchannel mapping information, and send the working subchannel mapping information to the capability negotiation response unit 212 for it to be carried in the terminal basic capability negotiation response. The sum of the bandwidths of the target subchannels indicated by the determined working subchannel mapping information is less than or equal to the maximum working bandwidth of the STA. On this basis, further, the working subchannel mapping information determination unit 216 may also adjust the maximum working bandwidth of the STA carried in the terminal basic capability negotiation request. At this time, the target subchannel indicated by the working subchannel mapping information The sum of the bandwidths is less than or equal to the adjusted maximum working bandwidth of the STA. On this basis, further, the target subchannel indicated by the working subchannel mapping information determined by the working subchannel mapping information determining unit 216 includes one or more available subchannels of the STA.

The spectrum aggregation mode information providing unit 217 is configured to provide the spectrum mode information indicating the relationship between the target sub-channels to the capability negotiation response unit 212, so that it can be carried and sent in the basic capability negotiation response of the terminal.

The formal identifier allocation unit 218 is configured to assign an official identifier within its own scope to the STA that sends the terminal basic capability negotiation request, and send the official identifier to the capability negotiation response unit 212 for it to carry in the terminal basic capability negotiation response sent in. The formal identifier assigning unit 218 may acquire the information of the STA currently requesting capability negotiation from the capability negotiation request receiving unit 211, and assign a formal identifier to the STA within its own scope.

The capability negotiation network side device in the embodiment of the present invention may include all the units shown in Figure 21 inside, but may also include only some of the units shown in Figure 21 according to different application requirements, so Figure 21 only shows An example of the structure of the capability negotiation network side device is given, and the structure is not limited.

It is understood that the specific order or hierarchy of steps in the processes disclosed is an example of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not meant to be limited to the specific order or hierarchy described.

In the foregoing Detailed Description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, the invention lies in less than all features of a single disclosed embodiment. Thus the following claims are hereby expressly incorporated into the Detailed Description, with each claim standing on its own as a separate preferred embodiment of this invention.

The foregoing description includes illustrations of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods to describe the above-mentioned embodiments, but those skilled in the art should recognize that various embodiments can be further combined and permuted. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent that the term "comprises" is used in the specification or claims, the word is contemplated in a manner similar to the term "comprises" as interpreted when "comprises" is used as a link in the claims. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or".

Claims (4)

1. a kind of method for data transfer, it is characterised in that suitable for wireless communication system, the method includes：

Broadcast message frame BCF is generated, the physical layer parameter for indicating Physical Frame Structure configuration in the BCF frames, is carried；The thing Reason layer parameter includes：The demodulation pilot tone time domain cycle of the OFDM symbol number at demodulation pilot time domain interval is indicated, in BCF frames The field of middle designated bit quantity is carried；

The BCF is sent to receiving terminal, so that receiving terminal knows the structure of physical frame.

2. the method for claim 1, it is characterised in that the physical layer parameter is also included such as the next item down or several：

The descending detecting pilot frequency pattern of indicating downlink detecting pilot frequency image index；

The position of the descending sounding channel of position of the indicating downlink sounding channel in descending transmission channel；

Descending protection interval DGI of indicating downlink and up conversion time；

Indicate the up up protection interval with descending conversion time.

3. a kind of device for data transfer, it is characterised in that suitable for wireless communication system, the device includes：

Signal generating unit, for generating broadcast message frame BCF, carries the physics for indicating Physical Frame Structure configuration in the BCF frames Layer parameter；The physical layer parameter includes：Indicate the demodulation pilot tone time domain of the OFDM symbol number at demodulation pilot time domain interval In the cycle, in BCF frames, the field of designated bit quantity is carried；

Transmitting element, for sending the BCF to receiving terminal, so that receiving terminal knows the structure of physical frame.

4. device as claimed in claim 3, it is characterised in that the physical layer parameter is included such as the next item down or several：

The descending detecting pilot frequency pattern of indicating downlink detecting pilot frequency image index；

The position of the descending sounding channel of position of the indicating downlink sounding channel in descending transmission channel；

Descending protection interval DGI of indicating downlink and up conversion time；

Indicate the up up protection interval with descending conversion time.