CN111132232B - Method and device for intelligently receiving 5G NR RLC UMD PDU - Google Patents

Abstract

The invention relates to a method and a device for intelligently receiving 5G NR RLC UMD PDUs, belonging to the technical field of communication. The method includes: after the RLC layer receives the notification of sending the RLC PDU of the MAC layer, it automatically starts the first detection device and judges whether the receiving buffer device meets the receiving condition; and then detects whether the PDU is complete by matching the SI field, and automatically stores the value according to the value of the SI field. To buffer area 1 and 2, discard the PDUs that do not contain the SI field; if there is a PDU in the receiving buffer area 1, it will automatically match and delete the RLC header field and forward it to the upper layer; if there is a PDU in the receiving buffer area 2, trigger the second detection device to adapt Update the judgment condition, check whether the value of SN is within the receiving range, discard the PDUs that are not within the range, and send the PDUs within the range to the sliding reassembly window to be sent to the upper layer after completing the segmental reorganization. The present invention can reduce the probability of problems in subsequent reception.

Description

A method and device for intelligently receiving 5G NR RLC UMD PDU

technical field

The invention belongs to the technical field of communication, and relates to a method and a device for intelligently receiving 5GNRLRCUMDPDU.

Background technique

5G technology provides an Internet of Everything network with high-speed connection, low latency and big data throughput. Since 3GPP announced the completion of Release 15 (R15), the first international standard for 5G in June 2018, many telecom operators around the world have begun Experimenting with 5G services, my country's three major telecom operators and many equipment manufacturers are also actively promoting 5G construction. As the next generation of communication technology, 5G represents the future application scenario of the Internet of Everything. The new generation of information technology system built on the basis of 5G technology will bring new development to mobile communication.

The Radio Link Control Layer (RLC: RadioLinkControl) is an important part of 5GNR to realize data transmission. It is located between the PDCP layer and the MAC layer of the protocol stack. It provides data segmentation, data transmission (retransmission), Data discard service. According to different types of transmission data, the RLC data transmission modes are divided into three categories, namely transparent mode (TM: TransparentMode), unacknowledged mode (UM: Unacknowledged Mode) and confirmed mode (AM: Acknowledged Mode), and correspond to three RLC entities .

Among them, the efficiency of data transmission in the unacknowledged mode is higher, but because the module does not feed back confirmation information, it is impossible to know whether the data is normally transmitted to the peer entity, so the reliability of this mode is poor; and in actual 5GNR In the system, due to factors such as the physical layer and the air interface, the header field of the RLC PDU in transmission is very likely to be mutated or lost before the peer RLC entity receives it. In this case, the receiving end of the peer entity receives an incomplete PDU and may receive a PDU after a mutation in the SN, resulting in interruption of data transmission services or reception of erroneous data.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide a method and device for intelligently receiving 5GNRLRCUMDPDU, which intelligently and reliable UMDPDU receiving process, reduces the probability of problems in subsequent receiving, and realizes high-efficiency data transmission.

To achieve the above object, the present invention provides the following technical solutions:

A device for intelligently receiving 5GNRLRCUMDPDU, comprising:

The first detection device, when the RLC layer receives the RLCPDU transmission notification of the MAC layer, starts automatically, and detects whether the PDU is complete by matching the SI field. If the SI field is not included in the PDU, it is directly discarded, otherwise it is put into the receiving buffer;

The receiving buffer device automatically stores the RLCPDU to the first buffer zone and the second buffer zone according to the value of the SI field;

The second detection device is used to judge whether the sequence number of the RLC PDU is within the receiving range, and the PDU that is not within the range is directly discarded, otherwise the RLC data sliding reorganization is performed;

a discarding device, configured to discard the RLC PDUs that do not meet the detection conditions of the first detection device and the second detection device and that cannot be segmented and reassembled;

The RLC sliding reassembly device is used to wait and reassemble all the segment data of the RLC SDU. If all segments are not received within the specified time, the received segment data will be discarded, otherwise the reorganization will be performed;

The sending device is used for sending and receiving the RLC PDU in the first area of the buffer and the RLC PDU after the segmentation and reassembly to the PDCP layer.

Optionally, the first detection device further includes detection of the state of the receiving buffer device, if the receiving buffer is empty or there is still storage space, the data receiving process is triggered; if the receiving buffer is full, the first detection module is suspended and the buffering After returning to normal, start the receiving process.

Optionally, the receiving buffer device may be dynamically divided into a receiving buffer area 1 and a receiving buffer area 2 according to the data type, wherein the receiving buffer area 1 is responsible for storing PDUs with SI up to 00, and the receiving buffer area 2 is responsible for storing SI for other areas. value PDU.

Optionally, the second detection device determines whether the sequence number of the PDU is within the receiving range, that is, only the PDU with Re_Next_Ressembly<=SN<SNmax meets the receiving condition.

Optionally, the judgment of the second detection device further includes an adaptive update of the second detection condition, wherein the Re_Next_Ressembly state variable maintains the value of the earliest SN waiting for reorganization, and the value changes with the sliding reorganization window. The value of the sequence number is dynamically configured by the RRC layer to be 6 bits or 12 bits according to the radio resource conditions.

Optionally, the RLC sliding reassembly device further includes an RLC header field deletion device, if all data segments with SN=X are received within a certain period of time, automatically match and delete the RLC header field and forward it to the upper layer; otherwise, discard the received data. Segment data to SN=X.

Optionally, the sending device further includes an RLC header field deletion device, which automatically matches the RLC header field of the RLC PDU in the first area of the buffer and is forwarded to the upper layer; the RLC PDU that has been reorganized is directly forwarded to the upper layer;

All RLC devices do not perform sequencing operations on RLC PDUs.

A method for intelligently receiving a 5G NR RLC UMD PDU, the method is implemented by a receiving device located at the RLC layer, and the receiving device performs the following steps:

RLC receives the RLC PDU transmission notification of the MAC layer, and automatically starts the first detection device to determine whether the receiving buffer device satisfies the receiving condition;

By matching the SI field, check whether the PDU header field is complete, and automatically store it in the first and second areas of the cache according to the value of the SI field, and discard the PDU that does not contain the SI field;

Process the RLC PDU received in the first area of the buffer, automatically match and delete the RLC header field and forward it to the upper layer;

Process the RLC PDUs in the receiving buffer area 2, trigger the second detection device to adaptively update the judgment condition, and judge whether the serial number of each PDU in the receiving buffer area 2 is within the receiving range, and the data segments within the range enter the reorganization process, Otherwise discard this PDU;

Detect the SN range, if the value of SN is within the receiving range, the PDU enters the sliding reorganization window, and the reassembly device reorganizes according to the sequence number of the PDU. If all segments with SN=X are received within a certain period of time, they will automatically match and Enter the sending process after deleting the RLC header field, otherwise discard all the currently received segments with SN=X;

Send the RLC SDU that is in the receive buffer area and that has completed segment reassembly to the PDCP layer.

Optionally, before the receiving buffer, the following steps are further included:

The step of receiving the RLC PDU is only executed after receiving the transmission opportunity indication from the lower layer MAC.

Optionally, before the detection of the SN range, the following steps are also included:

The judgment condition of the second detection device is adaptively updated, wherein the lower limit of the judgment condition is configured according to the Re_Next_Ressembly value of the sliding reassembly window, and the upper limit of the judgment condition is configured according to the size of the sequence number configured by the RRC layer.

The beneficial effects of the present invention are:

First, the present invention automatically starts the first detection device after receiving the notification of RLC PDU transmission from the MAC layer, and then starts the receiving step after judging whether the receiving buffer device meets the receiving conditions; by matching the SI field to detect the PDU header field to determine whether the data is complete ; Realize automatic partition storage according to the value of the SI field, and the size of the storage area is dynamically allocated; According to the sliding reorganization window and the upper layer configuration, adaptively update the second detection range, and further judge whether the SN of this RLC PDU has a sudden change; According to different The RLC header field automatically matches the length of the RLC header field and is forwarded to the upper layer after deletion. The method can make the UMDPDU receiving process intelligent and reliable, reduce the probability of problems in subsequent receiving, and realize high-efficiency data transmission.

Other advantages, objects, and features of the present invention will be set forth in the description that follows, and will be apparent to those skilled in the art based on a study of the following, to the extent that is taught in the practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the following description.

Description of drawings

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be preferably described in detail below with reference to the accompanying drawings, wherein:

1 is a schematic structural diagram of an apparatus for intelligently receiving 5G NR RLC UMD PDUs according to the present invention;

Fig. 2 is the first flow chart of the method for intelligently receiving 5G NR RLC UMD PDU according to the present invention;

Fig. 3 is the second flow chart of the method for intelligently receiving 5G NR RLC UMD PDU of the present invention;

Detailed ways

The embodiments of the present invention are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only used to illustrate the basic idea of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

Among them, the accompanying drawings are only used for exemplary description, and represent only schematic diagrams, not physical drawings, and should not be construed as limitations of the present invention; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings will be omitted, The enlargement or reduction does not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the accompanying drawings may be omitted.

The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms “upper”, “lower”, “left” and “right” , "front", "rear" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must be It has a specific orientation, is constructed and operated in a specific orientation, so the terms describing the positional relationship in the accompanying drawings are only used for exemplary illustration, and should not be construed as a limitation of the present invention. situation to understand the specific meaning of the above terms.

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of an apparatus for intelligently receiving 5G NR RLC UMD PDUs according to the present invention. Wherein, the apparatus is included in a terminal device of a wireless communication system. The wireless communication system is a wireless communication system based on 3GPP 5G NR. The terminal equipment of the wireless communication system includes a base station and a user equipment. It should be noted that those skilled in the art should understand that the wireless communication system, base station, and user equipment are not limited to the above.

The receiving device is located at the RLC layer, and includes a first detecting device 11 , a receiving buffer device 12 , a second detecting device 13 , a discarding device 14 , an RLC sliding reassembly device 15 , and a sending device 16 .

The first detection device 11 starts automatically when the RLC layer receives the notification of the RLC PDU transmission from the MAC layer, and is used to detect whether the received RLC PDU contains the SI field. .

The first detection module 11 also includes detection of the state of the receiving buffer device. If the receiving buffer is empty or there is still storage space, the data transmission process is triggered; if the receiving buffer is full, the first detecting module 11 is suspended.

The receiving buffer device 12 automatically stores the RLC PDU in the first buffer area and the second buffer area according to the value of the SI field.

The receiving buffer device 12 should dynamically divide the receiving buffer area 1 and the receiving buffer area 2 according to the amount of data received, wherein the receiving buffer area 1 is responsible for storing PDUs with SI to 00, and the receiving buffer area 2 is responsible for storing SI as other values. PDU.

The second detection device 13 is used for judging whether the sequence number of the RLC PDU is within the acceptance range Re_Next_Ressembly<=SN<SNmax, and the PDUs that are not within the range are directly discarded, otherwise the RLC data sliding reorganization is performed, and the No. 1 can be adaptively updated before each judgment. 2. Judgment range of detection.

The second detection device 13 also includes automatic update of the judgment range, wherein the value of Re_Next_Ressembly changes with the reassembly window, and the value of SNmax is dynamically configured by the RRC layer according to the radio resource conditions. The sequence number is 6 bits or 12 bits.

The discarding device 14 is used for discarding the RLC PDUs that do not meet the detection conditions of the first detection device 11 and the second detection device 13 and cannot be segmented and reassembled.

The RLC sliding reassembly device 15 is configured to wait and reassemble all the segment data of the RLC SDU. If all the segments are not received within the specified time, the received segment data will be discarded, otherwise, the reassembly will be performed.

The RLC reassembly device 15 also includes automatically matching the RLC header field and then deleting it. If all data segments with SN=X are received within a certain period of time, delete the header field and enter the sending process; otherwise, discard the segments that have received SN=X. data.

The sending device 16 is configured to send the RLC PDU buffered in one area and the RLC PDU after segment reassembly to the PDCP layer.

The sending device 16 also includes automatically matching the RLC header field and deleting it, deleting the RLC PDU header field in the first area of the receiving buffer and forwarding it to the upper layer; and directly forwarding the RLC PDU that has been reorganized to the upper layer.

FIG. 2 is a first flow chart of a method for intelligently receiving a 5GNR RLC UMD PDU according to the present invention, which is applicable to the case where the SI field of the PDU is lost or the SI is 00. Wherein, the method is implemented by a first detection device, a receiving buffer device, a discarding device, and a sending device, wherein the first detecting device performs step S11, step S12, step S13, and step S15, and the discarding device performs step S14, The receiving buffer device executes step S16, and the sending device executes step S17.

In step S11, the RLC receives the RLC PDU sending notification of the MAC layer, and automatically starts the first detection device to determine whether the reception buffer device satisfies the reception condition.

Next, in step S12, the state of the receiving buffer device is detected, if the receiving buffer is empty or there is still storage space, the data transmission process is triggered; if the receiving buffer is full, the first detection module is suspended.

In step S13, it is determined whether the data is complete by matching the SI field, where the value of SI is the first two bytes of the PDU.

The matching length of the SI is two bytes, and it is located two bytes before the PDU. If the SI of the RLC PDU does not exist or is lost, it indicates that the RLC PDU may be abnormal, and the RLC PDU is discarded.

At step S14, discard the PDU lacking the SI field;

In step S15, it is detected whether the SI of the RLC PDU is 00.

If the SI of the RLC PDU is 00, it means that the PDU contains the entire SDU, that is, the SDU is not segmented, and can be directly transmitted to the upper layer after the matching RLC header field is deleted.

In step S16, the RLC PDU with the SI field of 00 is put into the first area of the receiving buffer, wherein the storage area can be dynamically divided according to the amount of received PDU data.

In step S17, the RLC header field is automatically matched and deleted, and then forwarded to the upper layer.

When the header field of the PDU does not contain SN, the length of the automatic matching RLC header is eight bytes, which are two bytes of SI and six bytes of reserved bits. At this time, only these eight words are deleted when the automatic matching is deleted. Festival.

3 is a second flow chart of an apparatus for intelligently receiving a 5G NR RLC UMD PDU according to the present invention, which is applicable to the case where the SI field of the PDU is 00, 01 or 11. Wherein, the method is implemented by a first detection device, a receiving buffer device, a discarding device, a second detection device, a recombination device, and a sending device. In the method, the first detection device executes steps S21, S22, S23, and S25. , the discarding device executes step S24, the receiving buffer device executes step S26, the second detection device executes step S27, the reorganization device executes steps S28 and S29, and the sending device executes step S210.

In step S21, the RLC receives the RLC PDU sending notification of the MAC layer, and automatically starts the first detection device to determine whether the reception buffer device satisfies the reception condition.

Next, in step S22, the state of the receiving buffer device is detected, if the receiving buffer is empty or there is still storage space, the data transmission process is triggered; if the receiving buffer is full, the first detection module is suspended.

In step S23, it is determined whether the data is complete by matching the SI field, where the value of SI is the first two bytes of the PDU.

If the SI of the RLC PDU does not exist or is lost, it indicates that the RLC PDU may be abnormal, and the RLC PDU can be discarded.

At step S24, discard the PDU lacking the SI field;

In step S25, it is detected whether the SI of the RLC PDU is 00.

If the SI of the RLC PDU is not 00, it means that the PDU contains an SDU segment, that is, the SDU segment, and the complete SDU can only be transmitted to the upper layer after all the segments arrive and complete the reassembly.

In step S26, the RLC PDU whose SI field is not 00 is put into the second buffer area.

In step S27, it is detected whether the SN of the RLC PDU is within the range Re_Next_Ressembly<=SN<SNmax.

The second detection device adaptively updates the judgment condition, the lower limit of the judgment condition is the value of Re_Next_Ressembly of the reassembly window, and the upper limit of the judgment condition is the sequence number (6 bits or 12 bits) configured by the RRC layer. If the PDU is received and not within the range, it indicates that the SN of the PDU has changed abruptly or the PDU should not be received. If the value of SN is within the receiving range, the PDU enters the sliding reassembly window.

In step S28, it is judged whether all PDUs with SN=X are received. If all segments are received, it means that all SDU segments have been received, and the reassembly and uploading can be completed.

The reorganization device reorganizes according to the sequence number of the PDU. If it receives all the segments with SN=X within a certain period of time, it automatically matches the RLC header and deletes it and enters the sending process, otherwise it discards all the currently received segments with SN=X . The value of a certain time is configured by the RRC layer.

In step S29, after the automatic matching RLC header field is deleted, the PDU is reassembled into a complete SDU.

When the header field of the PDU contains an SN, there are four cases in which the RLC header field is automatically matched, and the lengths are eight bytes, sixteen bytes, twenty-four bytes, and thirty-two bytes. According to the values of SI and SN Realize automatic matching. At this time, when automatic matching is deleted, only the length of the corresponding header field is deleted.

In step S210, the RLC SDU for which segment reassembly has been completed is transmitted to the PDCP layer.

The invention may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The invention may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network.

To sum up, according to the solution of the present invention, firstly, after receiving the notification of RLC PDU transmission from the MAC layer, the first detection device is automatically activated to determine whether the receiving buffer device meets the receiving conditions, and then the receiving step is started; The field detection PDU header field judges whether the data is complete; realizes automatic partition storage according to the SI field value, and dynamically divides the size of the storage area; adaptively updates the second detection range according to the sliding reorganization window and the upper layer configuration, and further judges whether the SN of the RLC PDU occurs. Mutation; automatically match the RLC header field according to different RLC header fields and delete it and forward it to the upper layer. The method can make the UMD PDU receiving process intelligent and reliable, reduce the probability of problems in subsequent receiving, and realize high-efficiency data transmission.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent replacements, without departing from the spirit and scope of the technical solution, should all be included in the scope of the claims of the present invention.

Claims (1)

1. a device for intelligently receiving 5GNR RLC UMD PDU, is characterized in that: comprise: The first detection device, when the RLC layer receives the RLC PDU transmission notification of the MAC layer, starts automatically, and detects whether the PDU is complete by matching the SI field. If the SI field is not included in the PDU, it is directly discarded, otherwise it is put into the receiving buffer; The receiving buffer device automatically stores the RLC PDU to the first buffer zone and the second buffer zone according to the value of the SI field; The second detection device is used to judge whether the sequence number of the RLC PDU is within the receiving range, and the PDU that is not within the range is directly discarded, otherwise the RLC data sliding reorganization is performed; a discarding device, configured to discard the RLC PDUs that do not meet the detection conditions of the first detection device and the second detection device and that cannot be segmented and reassembled; The RLC sliding reassembly device is used to wait and reassemble all the segment data of the RLC SDU. If all segments are not received within the specified time, the received segment data will be discarded, otherwise the reorganization will be performed; A sending device, configured to send and receive the RLC PDU in a buffer zone and the RLC PDU after segmental reassembly to the PDCP layer; The first detection device also includes detection of the state of the receiving buffer device. If the receiving buffer is empty or there is still storage space, the data receiving process is triggered; if the receiving buffer is full, the first detection module is suspended, and the buffer is restored to normal. Start the receiving process; The receiving buffer device can be dynamically divided into a receiving buffer zone 1 and a receiving buffer zone 2 according to the data type, wherein the receiving buffer zone 1 is responsible for storing PDUs with SI to 00, and the receiving buffer zone 2 is responsible for storing PDUs with other values of SI; The second detection device determines whether the sequence number of the PDU is within the receiving range, that is, only the PDU with Re_Next_Ressembly<=SN<SNmax meets the receiving condition; The judgment of the second detection device also includes an adaptive update to the second detection condition, wherein the Re_Next_Ressembly state variable maintains the value of the earliest SN waiting for reorganization, and the value changes with the sliding reorganization window, and the value of SNmax is determined by the RRC. The layer dynamically configures the sequence number to be 6 bits or 12 bits according to the radio resource conditions; The RLC sliding reassembly device also includes an RLC header field deletion device. If all data segments with SN=X are received within a certain period of time, it will automatically match and delete the RLC header field and forward it to the upper layer; otherwise, discard the received SN=X. segmented data; The sending device also includes an RLC header field deletion device, which automatically matches the RLC header field of the RLC PDU in the first area of the buffer and is forwarded to the upper layer; the RLC PDU that has been reorganized is directly forwarded to the upper layer; All RLC devices do not perform sequencing operations on RLC PDUs; The method for intelligently receiving a 5G NR RLC UMD PDU of a device based on the 5G NR RLC UMD PDU is implemented by a receiving device located at the RLC layer, and the receiving device performs the following steps: RLC receives the RLC PDU transmission notification of the MAC layer, and automatically starts the first detection device to determine whether the receiving buffer device satisfies the receiving condition; By matching the SI field, check whether the PDU header field is complete, and automatically store it in the first and second areas of the cache according to the value of the SI field, and discard the PDU that does not contain the SI field; Process the RLC PDU received in the first area of the buffer, automatically match and delete the RLC header field and forward it to the upper layer; Process the RLC PDUs in the receiving buffer area 2, trigger the second detection device to adaptively update the judgment condition, and judge whether the serial number of each PDU in the receiving buffer area 2 is within the receiving range, and the data segments within the range enter the reorganization process, Otherwise discard this PDU; Detect the SN range, if the value of SN is within the receiving range, the PDU enters the sliding reorganization window, and the reassembly device reorganizes according to the sequence number of the PDU. If all segments with SN=X are received within a certain period of time, they will automatically match and Enter the sending process after deleting the RLC header field, otherwise discard all the currently received segments with SN=X; Send the RLC SDU that is in the receive buffer area and that has completed segment reassembly to the PDCP layer; Before the receiving buffer, the following steps are also included: After receiving the transmission opportunity indication from the lower-layer MAC, the step of receiving the RLC PDU is started; Before the detection of the SN range, the following steps are also included: The judgment condition of the second detection device is adaptively updated, wherein the lower limit of the judgment condition is configured according to the Re_Next_Ressembly value of the sliding reassembly window, and the upper limit of the judgment condition is configured according to the size of the sequence number configured by the RRC layer.

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