CN101692739A - Method and device for indicating transmission mode - Google Patents

Abstract

The invention discloses a method and device for indicating a transmission mode. The method includes: the sending end sets indication information in the downlink control information format, wherein the indication information is used to indicate to the receiving end that the transmission mode adopted by the sending end is single-user transmission mode or multi-user transmission mode. The invention realizes switching between single-user multi-layer transmission and multi-user transmission.

Description

Method and device for indicating transmission mode

technical field

The present invention relates to the communication field, in particular, to a method and device for indicating a transmission mode.

Background technique

In wireless communication, if multiple antennas are used at the sending end (e.g., base station, eNB for short), spatial multiplexing can be adopted to increase the transmission rate, that is, different antenna positions on the same time-frequency resource at the sending end To transmit different data, multiple antennas are also used at the receiving end (for example, user equipment, referred to as UE), and the resources of all antennas can be allocated to the same user in the case of a single user. This transmission form is called single user multiple input Multiple output (Single User-Multiple Input Multiple Output, referred to as SU-MIMO), in addition, in the case of multiple users, the resources of different antenna spaces can be allocated to different users, this transmission form is called multi-user MIMO (Multiple User MIMO, Abbreviated as MU-MIMO). If the transmission system needs to support single-user MIMO and multi-user MIMO at the same time, it is necessary for the eNB to use control signaling to provide data in these two transmission modes to the UE. In both transmission modes, the UE needs to know the rank (Rank) used by the eNB for the UE transmission. In the single-user mode, because all antenna resources are allocated to the same user, the number of layers used for transmission is equal to that of the eNB in the transmission. rank used; while in multi-user transmission, the number of layers used for a user transmission is less than the total number of layers for the transmission. To achieve dynamic switching between single-user and multi-user transmission, the eNB needs to notify the UE of different information in different transmission modes.

Long-Term Evolution (LTE for short) Version 8 (Release 8) defines the following three downlink physical control channels: Physical Control Format Indicator Channel (Physical Control Format Indicator Channel, PCFICH for short), physical Physical Hybrid Automatic Retransmission Request Indicator Channel (PHICH for short) and Physical Downlink Control Channel (PDCCH for short). Wherein, the PDCCH is used to carry downlink control information (DCI for short), including: uplink and downlink scheduling information, and uplink power control information. The format of DCI (DCI format) is divided into the following types: DCI format0, DCI format 1, DCI format 1A, DCI format 1B, DCI format 1C, DCI format 1D, DCI format 2, DCI format 2A, DCI format 3 and DCI format 3A etc. Among them, the transmission mode 5 that supports multi-user MIMO utilizes the downlink control information of DCI format 1D, and the Downlink poweroffset field in DCI format 1D is used to display that the power of a user in multi-user MIMO should be halved (ie -10log10 (2)), this is because this mode only supports user MIMO transmission of two users, because of this bit, transmission mode 5 can support dynamic switching between single-user and multi-user transmission, but no matter in single-user or multi-user Transmission of this DCI format can only support the transmission of one layer for each UE. Although LTE Release 8 supports single-user transmission of up to four layers in transmission mode 4, because the switching between transmission modes can only be semi-static, Therefore, it is impossible to dynamically switch between single-user multi-layer transmission and multi-user transmission in version 8.

Contents of the invention

The present invention is proposed to solve the problem in the related art that single-user transmission and multi-user transmission cannot be dynamically switched. Therefore, the main purpose of the present invention is to provide a transmission mode indication scheme to solve at least one of the above-mentioned problems.

In order to achieve the above object, according to one aspect of the present invention, a method for indicating a transmission mode is provided.

The indication method of the transmission mode according to the present invention includes: the sending end sets indication information in the downlink control information format, wherein the indication information is used to indicate to the receiving end that the transmission mode adopted by the sending end is a single-user transmission mode or multi-user transmission Way.

Preferably, when the indication information indicates that the transmission mode adopted by the sending end is a single-user transmission mode, the sending end sets the second indication information for indicating the rank used by the sending end to the receiving end in the format of the downlink control information.

Preferably, when the indication information indicates that the transmission method adopted by the sending end is a multi-user transmission method, the sending end sets the downlink control information format to indicate to the receiving end the rank used by the sending end for transmission and the first layer of the layer to start transmission. 3. Instructions.

Preferably, the indication information is one bit.

Preferably, when the bit is 0, it is used to indicate to the receiving end that the sending end adopts a single-user transmission mode; when the bit is 1, it is used to indicate to the receiving end that the sending end adopts a multi-user transmission mode.

In order to achieve the above object, according to another aspect of the present invention, a device for indicating a transmission mode is also provided.

The indicating device of the transmission mode according to the present invention is located at the sending end, and includes: a first setting module, configured to set indication information in the downlink control information format, wherein the indication information is used to indicate to the receiving end that the transmission mode adopted by the sending end is Single-user transmission mode or multi-user transmission mode.

Preferably, the above device further includes: a second setting module, configured to set the format of the downlink control information for instructing the receiving end to transmit A second indication of the rank used.

Preferably, the above device further includes: a third setting module, configured to set the format of the downlink control information for instructing the receiving end to transmit The rank used and the third indication information of the layer to start transmission.

Preferably, the indication information set by the first setting module is one bit.

Through the present invention, by setting the indication information indicating the single-user transmission mode or the multi-user transmission mode in the downlink control information format, the problem in the related art that single-user multi-layer transmission and multi-user transmission cannot be dynamically switched is solved, and further The switching between single-user multi-layer transmission and multi-user transmission is realized.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a flowchart of a method for indicating a transmission mode according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a multi-user transmission combination according to Example 1 of an embodiment of the present invention;

Fig. 3 is a preferred structural block diagram of an indicating device for a transmission mode according to an embodiment of the present invention.

Detailed ways

Functional Overview

The embodiment of the present invention provides a transmission mode indication scheme, that is, provides a control signaling indication scheme that supports dynamic switching between single-user multi-layer transmission and multi-user transmission in a multi-antenna transmission system, and the processing principle of the scheme As follows: the sending end sets indication information in the downlink control information format, wherein the indication information is used to indicate to the receiving end that the transmission mode adopted by the sending end is a single-user transmission mode or a multi-user transmission mode.

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

In the following embodiments, the steps shown in the flowcharts of the drawings may be performed in a computer system, such as a set of computer-executable instructions, and, although a logical order is shown in the flowcharts, in some cases , the steps shown or described may be performed in a different order than here.

method embodiment

According to an embodiment of the present invention, a method for indicating a transmission mode is provided. The method includes: a sending end (for example, a base station) setting indication information in a downlink control information format, wherein the indication information is used to send an indication information to a receiving end (for example, The user equipment) indicates that the transmission mode adopted by the sending end is a single-user transmission mode or a multi-user transmission mode.

By setting the indication information at the sending end, the receiving end can obtain whether the transmission mode of the sending end is a single-user transmission mode or a multi-user transmission mode.

Preferably, when the indication information indicates that the transmission mode adopted by the sending end is a single-user transmission mode, the sending end sets the second indication information for indicating to the receiving end the rank used by the sending end in the downlink control information format; In the case where the indication information indicates that the transmission mode adopted by the sending end is a multi-user transmission mode, the sending end sets the third indication information for instructing the receiving end to transmit the rank used by the sending end and the layer to start transmission in the downlink control information format.

Preferably, the indication information can be one bit but not limited to one bit: when the bit is 0, it is used to indicate to the receiving end that the sending end adopts a single-user transmission mode; when the bit is 1, it is used to indicate to the receiving end that the sending end A multi-user transmission method is adopted. Hereinafter, the embodiment of the present invention will be described in detail by taking the indication information as an example of one bit.

A bit is defined in the DCI Format to represent a single-user or multi-user transmission mode, where this bit can be called an MU bit. Preferably, the DCI Format is a new DCI Format X;

When the MU bit of a transport block indicates 0, it means that this is a single-user transmission. When this is a single-user transmission, the eNB must notify the UE of the rank used for the UE transmission; when the MU bit of a transport block indicates 1, it means This is a multi-user transmission. When this is a multi-user transmission, the eNB shall notify the UE of the rank used for the UE transmission and which layer starts the transmission for the UE.

Fig. 1 is a flowchart of a method for indicating a transmission mode according to an embodiment of the present invention. As shown in Fig. 1, the sending end is a base station, and the receiving end is a user equipment, and the flow includes the following steps:

Step S102, the eNB sends downlink control information to the UE;

Step S104, the UE judges whether the MU bit in the downlink control information is 1, and in the case of yes, executes step S106, and in the case of no, executes step S114;

Step S106, the UE determines that the transmission mode adopted by the eNB is a multi-user transmission mode, and determines the rank used for transmission from the rank bit (rank bit);

Step S108, the UE determines from which layer the transmission starts from the layer index bit (layer index bit);

Step S110, after the UE determines its transmission layer, it can perform channel and interference measurement, and then continue to perform demodulation;

In step S112, the processing of multi-user transmission is completed.

Step S114, the UE determines that the transmission mode adopted by the eNB is a single-user transmission mode, and determines the rank used for transmission from the rank bits;

In step S116, the UE completes the processing of single-user transmission.

The implementation process of the embodiment of the present invention will be described in detail below with reference to examples.

Example one

In this example, in the scenario of multi-antenna input and output (MIMO), the newly defined DCI Format X can be used to represent single-user or multi-user transmission methods. The 4 bits in this DCI format can be defined as follows:

In the single-user transmission mode, the MU bit indicates 0, indicating that this is a single-user transmission, and the eNB must notify the UE of the rank used for the UE transmission, and 3 bits can be used to represent the rank (rank), that is, in single-user transmission The rank used in is up to 8.

In the multi-user transmission mode, the MU bit indicates 1, indicating that this is a multi-user transmission. The eNB needs to inform the UE of the rank used for the UE transmission and which layer starts the transmission of the UE, which can be represented by 1 bit Rank (rank), that is, the rank used in multi-user transmission is at most 2, and 2 bits (Layer Index bit) can be used to inform the UE which layer to start transmitting to the UE. These two bits are in the rank bit = 0 and rank bit = 1 have different meanings.

When Rank bit=0, the UE only has single-layer transmission, and the transmission is carried out on the layer corresponding to LayerIndex, so single-layer transmission can only be transmitted on one of the first 4 layers, that is, layer index=0 , 1, 2 or 3.

When Rank bit=1, the UE has two-layer transmission, and layerindex=0, 1, 2or 3 can be used to represent layer 0, layer 2, layer 4, and layer 6 respectively, that is, the UE can only be in even-numbered layers The transmission starts from above, the following table 1 shows the layer corresponding to the layer index in the double-layer transmission, as shown in table 1:

Table I

Layer Index The layer used for the transport 0 Layer 0, Layer 1 1 Layer 2, Layer 3 2 Layer 4, Layer 5 3 Layer 6, Layer 7

Fig. 2 is a schematic diagram of multi-user transmission combinations according to Example 1 of the embodiment of the present invention. Fig. 2 specifically illustrates all multi-user transmission combinations that can be supported by this embodiment. In this case, a maximum of 4 users can be supported, and each user There are at most two layers.

Device embodiment

According to an embodiment of the present invention, a device for indicating a transmission mode is provided. The device corresponds to the above-mentioned method embodiment. The descriptions that have been made in the method embodiment will not be repeated here. The device includes: a first setting module 32, which is used to set indication information in the downlink control information format, wherein the indication information is used to indicate to the receiving end that the transmission mode adopted by the sending end is single The user's transmission method or the multi-user transmission method.

Fig. 3 is a preferred structural block diagram of an indicating device for a transmission mode according to an embodiment of the present invention. As shown in Fig. 3, the device may further include: a second setting module 34 and a third setting module 36, which will be described in detail below illustrate.

The second setting module 34 is connected to the first setting module 32, and is used to set the format of the downlink control information to indicate to the receiving end that the sending end transmits the The second indication information of the used rank; the third setting module 36 is connected to the first setting module 32, and is used to set the downlink control information format when the indication information indicates that the transmission mode adopted by the sending end is a multi-user transmission mode. Third indication information used to indicate to the receiving end the rank used by the sending end for transmission and the layer to start transmission.

Preferably, the indication information set by the first setting module 32 is one bit.

To sum up, through the above-mentioned embodiments of the present invention, the problem in the related art that single-user and multi-use transmission cannot be dynamically switched is solved, and then the switching between single-user and multi-user transmission is realized.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Optionally, they can be implemented with program codes executable by a computing device, so that they can be stored in a storage device and executed by a computing device, or they can be made into individual integrated circuit modules, or they can be integrated into Multiple modules or steps are fabricated into a single integrated circuit module to realize. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. the indicating means of a transmission means is characterized in that, comprising:

Transmitting terminal is provided with indication information in descending control information format, wherein, the transmission means that described indication information is used for indicating described transmitting terminal to adopt to receiving terminal is single user's transmission means or multi-user's transmission means.

2. method according to claim 1, it is characterized in that, be that described transmitting terminal is provided for indicating to described receiving terminal second indication information of the used order of described transmitting terminal transmission under single user's the situation of transmission means at described descending control information format in the transmission means that described indication information indicates described transmitting terminal to adopt.

3. method according to claim 1, it is characterized in that, indicate under the situation of transmission means for multi-user's transmission means that described transmitting terminal adopts at described indication information, described transmitting terminal is provided for indicating to described receiving terminal the 3rd indication information of the layer that the used sum of ranks of described transmitting terminal transmission begins to transmit at described descending control information format.

4. according to each described method in the claim 1 to 3, it is characterized in that described indication information is a bit.

5. method according to claim 4 is characterized in that, described bit is that what be used in 0 o'clock indicating that described transmitting terminal adopts to described receiving terminal is single user's transmission means; Described bit is that what be used in 1 o'clock indicating that described transmitting terminal adopts to described receiving terminal is multi-user's transmission means.

6. the indicating device of a transmission means is positioned at transmitting terminal, it is characterized in that, comprising:

First is provided with module, is used at descending control information format indication information being set, and wherein, the transmission means that described indication information is used for indicating described transmitting terminal to adopt to receiving terminal is single user's transmission means or multi-user's transmission means.

7. device according to claim 6 is characterized in that, also comprises:

Second is provided with module, being used in the transmission means that described indication information indicates described transmitting terminal to adopt is under single user's the situation of transmission means, is provided for indicating to described receiving terminal second indication information of the used order of described transmitting terminal transmission at described descending control information format.

8. device according to claim 6 is characterized in that, also comprises:

The 3rd is provided with module, be used for indicating under the situation of transmission means that described transmitting terminal adopts, be provided for indicating the 3rd indication information of the layer that the used sum of ranks of described transmitting terminal transmission begins to transmit at described descending control information format to described receiving terminal for multi-user's transmission means at described indication information.

9. according to each described device in the claim 6 to 8, it is characterized in that the described first described indication information that the module setting is set is a bit.

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