WO2012034521A1

WO2012034521A1 - Method and device for a multiuser mimo system to send data

Info

Publication number: WO2012034521A1
Application number: PCT/CN2011/079665
Authority: WO
Inventors: 朱胡飞; 李斌; 罗毅; 杨讯; 李云波; 李靖
Original assignee: 华为技术有限公司
Priority date: 2010-09-15
Filing date: 2011-09-15
Publication date: 2012-03-22

Abstract

The present invention relates to the field of communications, and in particular to the technology of multiuser multiple input multiple output (MU-MIMO) data transmission. A method for a multiuser MIMO system to send data, comprising: sending a signalling frame which includes: a user group ID, K station identifiers, and virtual identification, wherein the K station identifiers correspond to K stations respectively, the virtual identification indicates a set of stations composed of any M stations in the K stations, and the user group ID corresponds to the set of stations indicated by the virtual identification; wherein K is greater than M, M is the number of stations supported by the system, and the number of virtual identifications is a natural number less than or equal to [Equation 1]; and data are sent out, and an end user in the set of M STAs indicated by the virtual identification receives data sent from the multiuser MIMO system.

Description

Method and device for transmitting data in multi-user MIMO system

The present invention relates to the field of communication technologies, and in particular, to a technique for multi-user multiple input multi-output (MU-MIMO) data transmission.

Background technique

Space Division Multiple Access (SDMA) technology can make full use of the space resources of multi-antenna systems, so that the spectrum utilization of existing systems is multiplied. SDMA is also known as multi-user MIMO (multi-user MIMO, or MU-MIMO) technology, which performs spatial multiplexing between multiple user terminals.

Multi-user MIMO groups a plurality of user terminals (station, ie, STAs) into a group, which is called a multi-user MIMO group. Multiple user terminals in the group are spatially multiplexed. Therefore, corresponding instructions are required to indicate multi-user MIMO users. Information related to terminal grouping. The user group Group can also be used to specifically refer to the multi-user MIMO group described above.

To indicate information related to user terminal grouping in multi-user MIMO (i.e., MU-MIMO) mode, a MU-MIMO group definition field (Group-definition-field) is used.

Now that each group in MU-MIMO mode includes 4 user terminals, one MU-MIMO group definition domain signaling is as follows.

Wherein, the Group ID is a bit sequence indicating the user group serial number, and the AID ( Associated

Identifier ), such as AID1, AID2, etc., represents an identifier associated with each user terminal. Thus the AID can be referred to as a user terminal identifier or a user terminal ID. The AID can also be replaced with other information that can identify each STA. In one frame of information, one or more of the above-mentioned MU-MIMO group definition domain signaling may be transmitted, and multiple MU-MIMO user groups of different group numbers are defined, and each MU-MIMO user group includes AID1, AID2, AID3, and 4 user terminals identified by AID4. The MU-MIMO group definition domain may be referred to as a group definition domain. The above-mentioned group definition domain signaling is usually sent by an access point (AP) to each STA. After receiving the above-mentioned group-defined domain signaling, each STA knows the Group ID corresponding to the MU-MIMO group in which the STA identifier is located. In this example, when the STA finds that its AID is one of the above AID1, AID2, AID3, and AID4 indicated by a certain Group ID, it knows that it belongs to the MU-MIMO group defined by the above Group ID. After the MU-MIMO group definition domain signaling is used to define each MU-MIMO group, the spatial multiplex stream number indication (Stream Number Indication) signaling is used, as follows.

Group ID The precoding matrix corresponding to the user terminal k Qk

The number of columns of MU - MIMO (denoted as Ns t s - k ),

The user group serial number y bits k=l, 2, 3, 4 x bits The above-mentioned spatial multiplexed stream number indication signaling is just an example, and the MU-MIMO group definition domain signaling is defined to define a Group ID. After the MU-MIMO group, how to indicate the MU-MIMO group with the corresponding Group ID. It is also possible to identify other various signaling or data packets with the Group ID, which is generally expressed as follows:

At present, the AP can only use the four STAs included in the group ID, and cannot select STAs from more STAs according to the current channel conditions and data queues to be transmitted. If you try your best to exhaust all kinds of STA combinations, it is too complicated and costly.

Summary of the invention

The embodiment of the invention provides a method for transmitting data of a multi-user MIMO transmission, which can select a terminal corresponding to the group ID from the terminal, and reduce overhead.

A method for transmitting data by a multi-user MIMO system includes: Sending a signaling frame, where the signaling frame includes: a user group serial number Group ID; K user terminal identifiers and virtual identifiers;

The K user terminal identifiers respectively correspond to K user terminals;

The virtual identifier indicates a user terminal combination composed of any M terminal users of the K user terminals;

Where K is greater than M, and M is the number of user terminals supported by the system; the number of the virtual identifiers is a natural number less than or equal to;

Transmitting data, the end user in the combination of the M STAs indicated by the virtual identifier receives the data sent by the multi-user MIMO system. A method for transmitting data by multi-user MIMO, comprising:

Sending a user group serial number Group ID and K user terminal identifiers, the user terminal identifiers respectively corresponding to the user terminals;

Send a virtual identifier;

send data;

The virtual identifier indicates a combination of user terminals composed of any one of the user terminals, and the terminal user in the combination of the STAs indicated by the virtual identifier receives the data; where Κ is greater than Μ, Μ The number of user terminals supported by the system; the number of the virtual identifiers is a natural number less than or equal to. A method for transmitting data by multi-user MIMO includes:

Transmitting a combination identifier, where the combination identifier is used to determine that the combination identifier indicates one of the user terminals;

Sending data, the user terminal determined by the combination identifier receives the data; where Κ is greater than Μ, Μ is the number of user terminals supported by the system; and the number of the virtual identifiers is a natural number less than or equal to. Meanwhile, an embodiment of the present invention further provides an apparatus for implementing the above method.

The method provided by the embodiment of the present invention specifies K users by using a group ID, and then selects M user terminals that can be supported by the system among the K users through the virtual identifier, and does not need to exhaust the exhaustion of various STA combinations and Group IDs. , the choice of the user terminal is realized, and the system overhead is reduced. detailed description

A method for transmitting data by multi-user MIMO is provided in the embodiment of the present invention. An access point (AP) sends a plurality of spatially multiplexed streams to a plurality of STAs included in a multi-user MIMO group, and the plurality of streams are precoded by a precoding matrix and then sent to multiple transmissions. The antenna is transmitted, that is, the symbol vector composed of the symbols of the plurality of streams left by the precoding matrix, and the obtained result is sent to a plurality of transmitting antennas for transmission.

In this embodiment, the multi-user MIMO system supports M user terminals. To indicate information related to user terminal grouping of multi-user MIMO (i.e., MU-MIMO), a MU-MIMO group-definition-field is used. :3⁄4, shown below,

The signaling frame sent by the AP includes: group ID; K user terminal identifiers AID, which respectively correspond to K users (AID1, AID2... AIDk), where Κ is greater than Μ; virtual identifier C (Cl, C2. ...Cn ) where the number of virtual identities can take a natural number less than or equal to. The virtual identifier (virtual ID) may also be referred to as an extended ID, and the virtual identifier is used to indicate any one of the possible combinations of the M STAs among the K STAs. In order to save the number of bits required to represent C1, C2, ..., C1, C2... may also be any one of the combinations of K subsets that are included in a subset of all possible combinations of M STAs. In actual use, it is also possible to select less than M STAs. The following example introduces a scenario with K = 8 and M = 4 as an example. The signaling frame sent by the AP includes the group ID; and the AID or data of 8 users respectively, AID1-AID8, which are represented as A, B, C, D, E, F, G, H; In this embodiment, there are 16 virtual IDs. Therefore, in the present embodiment, for the group ID in one data frame, in the current data transmission, the corresponding four users can have 16 options, as follows:

In the manner shown in the above figure, multiple multi-user MIMO groups can be defined at the same time. Detailed descriptions are given below for various situations.

C1, C2, etc. in the above figure respectively indicate respective combinations, which may be any one of all possible combinations of 4 STAs among 8 STAs. In order to save the number of bits required to represent the virtual identity, the virtual identity may also be any one of the combinations included in a subset of all possible combinations of the four STAs of the eight STAs.

In the embodiment, the foregoing signaling defines a total of 16 user group groups, so that the virtual identifiers have C1, C2, C3, ..., C16 different combinations, and each virtual identifier represents 4 out of 8 STAs. Any of all possible combinations of STAs. Since there are a total of 70 combinations in 8 , it is necessary to represent at least 7 bits for each of these combinations. The corresponding extension ID requires at least 7 bits.

One embodiment is 7 bits included in each virtual identifier Ci (i = l, 2, ... 16), in order of priority - corresponding to A, B, C, D, E, F, G. STAs. The bit of a certain location is 1, indicating that the corresponding STA is in the user group Group indicated by Ci, and the bit of a certain location is 0, indicating that the corresponding STA is not in the group indicated by Ci. After receiving the above signaling, the STA counts the total number of 1 out of all 7 bits. If the total number is 4, it indicates that the group already contains 4 STAs, and the corresponding STA H is not in the group indicated by Ci; If the total number is 3, it means that the group only contains 3 STAs, and the corresponding STA H must be in the group indicated by Ci. in. For example, if Cl=0101011, the virtual user group defined by the CI includes the 2nd, 4th, 6th, and 7th STAs indicated by the Group ID, namely: ^D, F, G; and C2=0101010, which indicates the virtual defined by C2. The user group includes the 2nd, 4th, and 6th STAs indicated by the Group ID, that is, B, D, and F. At the same time, since the virtual user group must include 4 STAs, it can be inferred that the virtual user group defined by C2 also contains H, that is, it A total of four STAs of B, D, F, and H are included.

Or another implementation manner is as follows: Each Ci may also contain 8 bits, which are sequentially arranged, corresponding to 8 STAs of A, B, C, D, E, F, G, and H. For example, if C2=01010101, it means that the virtual user group defined by C2 includes the 2nd, 4th, 6th, and 8th STAs indicated by the Group ID, that is, B, D, ? And 11.

After the 16 MU-MIMO groups are defined by the MU-MIMO group defined domain signaling described above, the respective MU-MIMO groups can be indicated by the corresponding Group ID and combined identifier. After receiving the group ID and the combination identifier, each STA first determines, according to the combination identifier, the combination identifier to indicate the determined STA in all the STAs indicated by the group ID, and then extracts the corresponding STA combination from all the STAs indicated by the group ID. STAs at various locations, thereby determining the respective STAs corresponding to the group. The general representation of the various various signaling or data packets identified by the Group ID and the above combined identification is shown below:

Group ID, ie

Ml MIMO group sequence combination identification various signaling or data

In summary, the combined identifier has the following functions: The combined identifier indicates that the current Group ID and the combined MU-MIMO group indicated by the combined identifier are the MU-MIMO group definition i or the signaling defined by the MU- Which MU-MIMO group in the MIMO group. After receiving the group ID and the combination identifier, the STA determines, which one of the MU-MIMO groups of the MU-MIMO group defined by the foregoing MU-MIMO group definition domain signaling, and then passes the MU-MIMO group. Domain The information contained in the signaling determines each STA corresponding to the MU-MIMO group (ie, Group). The MU-MIMO group described above defines i or signaling for defining each MU-MIMO group. When the definition of the MU-MIMO group needs to be modified, it can be implemented by issuing a new MU-MIMO group definition i or signaling. After each MU-MIMO group is defined by MU-MIMO group definition domain signaling, the communication system can use these defined MU-MIMO groups for MU-MIMO transmission and reception, for example, the AP sends a frame, including the above. The Group ID and the combined identity, followed by a sequence for channel estimation, and a plurality of data streams that are spatially multiplexed by MU-MIMO. After receiving the foregoing frame, the STA determines the STA included in the current MU-MIMO group by using the Group ID and the combined identifier to determine whether it is in the current MU-MIMO group, and if it is in the current MU-MIMO group, receives the corresponding The data sent to itself, if not in the current MU-MIMO group, does not need to receive data. Further, as a new embodiment, the virtual identifier may also be any one of the combinations included in a subset of all possible combinations of the four STAs of the eight STAs. In order to reduce the number of bits occupied by each extended ID Ci (i = l, 2, 16), Ci may be made to represent any one of the combinations contained in a subset of all possible combinations.

There are two implementations for this implementation. The first implementation is: Each subset of the subsets that can be included meets a specific location and can only be a specific STA. For example, you can specify that the first STA in the group can only be A or E. The second STA in the group can only be B or F. The third STA in the group can only be C or G, but in the Group. The fourth STA can only be D or H. Correspondingly, each Ci ( i = l , 2, 16 ) can occupy only 4 bits. For example, the first bit is 0, indicating that the first STA in the group is A, and the first bit is 1 indicating Group. The first STA in the frame is E; the second bit is 0, indicating that the second STA in the group is B, and the second bit is 1 indicating that the second STA in the group is F; the third bit is 0. Indicates that the third STA in the group is C, and the third bit is 1 indicating that the third STA in the group is G; the fourth bit is 0, indicating that the fourth STA in the group is D, and the fourth A bit of 1 indicates that the fourth STA in the Group is H. Thus, each Ci can represent one of the subsets with 4 bits. Combination. For example, if Ci is 0101, it means that the first, second, third, and fourth STAs of the group are A, F, C, and H, respectively. The second implementation manner is as follows: The eight STAs indicated by the Group ID are divided into two subgroups, ABCD and EFGH. Each combination contained in the subset satisfies two of the STAs selected from the ABCD subgroup, and the other two STAs are selected from the EFGH subgroup. There are a total of 6 different combinations, so that the subset contains a total of 6 x 6 = 36 different combinations, so that each Ci (i = l, 2, 16) occupies at least 6 bits. There may be various-correspondences between the bit sequence representing Ci and the 36 combinations.

Still further, as another new embodiment, after the p MU-MIMO groups are defined by the MU-MIMO group definition domain signaling of the present embodiment described above, the MU-MIMO can be indicated by the corresponding Group ID and the combined identifier. group. The size of the p determines the minimum number of bits occupied by the combined identifier. For example, p = 16, the combined identifier occupies 4 bits. In practice, p can be taken to a smaller value such that the combined number of bits occupied by the combined identification is small. For example, p=4 can be made, so that the MU-MIMO group definition i or signaling of the present embodiment defines four MU-MIMO groups, that is, four different representations represented by Ci (i = 1, 2, 3, 4) Correspondingly, the minimum number of bits occupied by the combined identifier is 2, that is, when each of the four MU-MIMO groups is indicated by the corresponding Group ID and combined identifier, only 2 bits are needed for the combined identifier. For example, MU-MIMO groups (ie, the indicated STA combinations) indicated by C1, C2, C3, and C4 may be indicated by 00, 01, 10, and 11, respectively.

In the above embodiment, multiple MU-MIMO groups are defined by MU-MIMO group definition domain signaling, and the multiple MU-MIMO groups are several combinations of M from K STAs corresponding to the Group ID. The corresponding Group.

According to still another embodiment of the present invention, the group ID and the specified K STAs are transmitted, and then the signaling is not used, but the AP and each STA obtain the K STAs according to the protocol. A group corresponding to several combinations of M.

In the foregoing embodiment, a plurality of MU-MIMO groups are defined by MU-MIMO group definition domain signaling, where the plurality of MU-MIMO groups are obtained from K STAs corresponding to the Group ID. Make a group corresponding to the combination. In practice, after the K STAs specified by the Group ID are transmitted, the signaling may not be used, but the AP and each STA may derive a number of K STAs according to a predetermined protocol. Group corresponding to the combination.

In another embodiment of the method for transmitting data by the multi-user MIMO of the present invention, the STA specified by the Group ID is transmitted first, including K STAs, K is greater than M, and M is the maximum number of STAs included in a multi-user MIMO group. In the embodiment, there are 8 STAs, and the corresponding signaling is as follows:

Then, each MU-MIMO group is directly indicated by the corresponding Group ID and combined identification. In this example, K = 8 and M = 4, the above signaling actually defines 70 Groups, that is, all possible combinations. Therefore, after the above signaling, each MU-MIMO group can be directly indicated by the corresponding Group ID and combined identifier. In this example, the combined identifier uses 7 bits, as shown below.

Group ID, ie

M IMO combination identification Various signaling or data

The user group sequence number is identified by a combination of 7 bits, and one of all possible 70 combinations can be indicated in a manner agreed upon in advance by agreement. After receiving the group ID and the combination identifier, each STA first determines the location of each STA in the STA combination of the group according to the combination identifier, and then removes the STA combination from all the STAs indicated by the group ID. Corresponding STAs at each location, thereby determining each STA corresponding to the group. It is easy to see that in the current embodiment, the current indication can be directly indicated by the combined identification A combination of STAs corresponding to one MU-MIMO group. After receiving the group ID and the combined identifier, the STA determines the STA combination corresponding to the current one MU-MIMO group by using the combined identifier, and then defines the information contained in the domain signaling by the MU-MIMO group (that is, all K STAs, In this embodiment, Κ=8), M STAs corresponding to the MU-MIMO group (ie, Group) are determined (M=4 in this embodiment). 7 bits included in each combination identifier, in order of precedence - corresponding to A, B, C, D,

E, F, G, 7 STAs. The bit of a certain location is 1 , indicating that the corresponding STA is in the group indicated by the combined identifier, and the bit of a certain location is 0, indicating that the corresponding STA is not in the group indicated by the combined identifier. After receiving the above signaling, the STA counts the total number of 1 out of all 7 bits. If the total number is 4, it indicates that the group already contains 4 STAs, and the corresponding STA H is not in the group indicated by the combined identifier. If the total number is 3, it means that the group only contains 3 STAs, and the corresponding STA H must be in the group indicated by the combination identifier. In practice, each of the combined identifiers may also contain 8 bits, which are in the order of - 8 B, C, D, E, F, G, H. Specifically, in the combined identifier including 8 bits, it is not always always 4, and may be 3, 2, or 1 1. This can balance the scenario where the number of STAs actually scheduled by multi-user MIMO is less than 4. For greater flexibility. In another implementation, the above signaling defines 16 Groups, which correspond to a subset of all possible 70 combinations. Therefore, after the above signaling, each MU-MIMO group can be directly indicated by the corresponding Group ID and combined identifier, as shown below.

Group ID, ie

M IMO combination identification Various signaling or data

User group number An implementation manner may be: The 16 groups that are actually defined by the foregoing signaling all meet a specific location and can only be a specific STA. For example, you can specify that the first STA in the group can only be A or E. The second STA in the group can only be B or F. The third STA in the group can only be C or G, but in the Group. The fourth STA can only be D or H. Correspondingly, the combined identifier can occupy only 4 bits. For example, the first bit is 0, indicating that the first STA in the group is A, and the first bit is 1 indicating that the first STA in the group is E; Two bits of 0 indicate that the second STA in the group is B, and a second bit of 1 indicates that the second ST A in the group is F; the third bit is 0 indicating that the third STA in the group is C, and the third bit is 1 indicating that the third STA in the group is G; the fourth bit is 0 indicating that the fourth STA in the group is D, and the ^fourth bit is 1 indicating the fourth in the Group Thus, the combined identifier can represent one of the 16 groups by 4 bits. For example, if the combination identifier is 0101, it indicates that the first, second, third, and fourth STAs of the group are A, F, C, and H respectively; after receiving the foregoing signaling, the STA can know the group indicated by the signaling. The 8 octaves included are eight, F, C, and H. It is also possible to use another new implementation, the above signaling defining 36 Groups, which correspond to a subset of all possible 70 combinations. Therefore, after the above signaling, each MU-MIMO group can be directly indicated by the corresponding Group ID and combined identifier, as shown below.

Group ID, ie

M IMO combination identification Various signaling or data

User group number

The eight STAs indicated by the Group ID can be divided into two subgroups, ABCD and EFGH. The 16 groups defined by the above signaling satisfy that two STAs in the group are selected from the ABCD subgroup. The other two STAs are selected from this subgroup of EFGH. There are a total of 6 different combinations, so that the subset contains a total of 6 x 6 = 36 different combinations, so that the combined identifier occupies at least 6 bits. The bit sequence indicating the combined identifier and the 36 combinations may have various-corresponding relationships. It is easy to see from the above description that the Ci used in each virtual group defined in the previous embodiment may be used as the current embodiment. The combined identifier to. The number of STAs indicated by each group ID is not limited to eight, and may be any other number; the number of STAs included in each group is not limited to four, and may be any other number; and each MU-MIMO group defines a domain. The number of Groups defined by the signaling is not limited to 16 or 4 as described in the embodiment, and may be any other number.

In the above embodiment, the data sent by the AP transmits the Group ID, the user's AID or data, and the extended ID through one frame. In the following embodiments, in the embodiment, the foregoing information may not be transmitted in the same MU-MIMO group definition domain signaling, but may be transmitted by multiple MU-MIMO group definition domain signaling.

In the first implementation, the K STAs specified by the Group ID may be transmitted first. In this example, K=8 is still used as an example, and the corresponding signaling is as follows;

Then, the extension IDs indicating different combinations are transmitted, and there are a total of n extension IDs. In this embodiment, n is equal to 16, as shown: CI C2 C3 C4

GrouP Cn

ID

The second implementation manner may first transmit the first part of the K STAs specified by the Group ID, for example, the first K/2, for example, 4, and the corresponding signaling is as follows;

Then, the last K/2 of the 8 STAs specified by the Group ID are transmitted, and the corresponding signaling is as follows;

The transfer then indicates the first 4 extension IDs in the different combinations: C1, C2, C3, C4, as follows:

The transfer then indicates the last 4 extended IDs in the different combinations: C5, C6, C7, C8, as follows:

Each of the foregoing signalings usually needs to identify the signaling itself, which can be performed by various methods. Realized. In particular, after the foregoing embodiments, that is, the corresponding sequence relationship may be indicated by a sequence of time or frequency domains, or may be indicated by an identifier of each signaling. The method provided by the embodiment of the present invention specifies K users by using a group ID, and then selects M user terminals that can be supported by the system among the K users through the virtual identifier, and does not need to exhaust the exhaustion of various STA combinations and Group IDs. , the choice of the user terminal is realized, and the system overhead is reduced. Embodiments of the present invention also provide an apparatus for implementing the above method.

A device for transmitting data in a multi-user MIMO system, comprising:

And a unit for sending a signaling frame, where the signaling frame includes: a user group serial number Group ID; K user terminal identifiers and virtual identifiers, and the user group serial number Group ID identifier a user group composed of K user terminals;

The K user terminal identifiers, where the K user terminal identifiers respectively correspond to K user terminals;

The virtual identifier, the virtual identifier indicating a combination of user terminals composed of any M terminal users of the K user terminals;

And a unit for transmitting data, where the terminal user in the combination of the M STAs indicated by the virtual identifier receives the data sent by the multi-user MIMO system. A device for transmitting data by multi-user MIMO, comprising:

a sending unit, configured to send a user group serial number Group ID and K user terminal identifiers, where the user terminal identifiers respectively correspond to one user terminal, and the user group serial number Group ID identifies the K user terminals a group of users;

Send a virtual identifier;

send data;

The virtual identifier indicates a user end composed of any M terminal users of the K user terminals End combination, the end user in the combination of the M STAs indicated by the virtual identifier receives the data; where K is greater than M, and M is the number of user terminals supported by the system; the number of the virtual identifiers is a natural number less than or equal to. A device for transmitting data by multi-user MIMO, comprising:

a first sending unit, configured to send a user group serial number Group ID and a K user terminal identifier, where the user terminal identifiers respectively correspond to one user terminal, and the user group serial number Group ID identifies the K a user group composed of user terminals;

a second sending unit, configured to send a combined identifier, where the combined identifier is used to determine that the combined identifier indicates the K user terminals, M user terminals;

a third sending unit, configured to send data, where the M user terminals determined by the combined identifier receive the data; where K is greater than M, and M is the number of user terminals supported by the system; the number of the virtual identifiers is less than A natural number equal to. In the foregoing embodiments, it can be seen that the user group consisting of the K user terminals is identified by the user group serial number Group ID. The implementation is mainly given for the case of K=8. It is easy to see that the number of defined user groups only affects the number of bits occupied by the combined identifier, and can be extended to other ρ values from the example of the value of ρ. The following is given for each Κ value (5 Κ 16 ) different from 8 .依然 Still take 4 as an example. For any threshold, a bitmap containing a bit of bits can be used to form a virtual marker, each bit corresponding to an AIDi (i=l, 2, ..., K). The i-th bit is 1, indicating that the STA indicated by the corresponding AIIi is in the virtual group indicated by the virtual identifier Ci, and the i-th bit is 0, indicating that the STA indicated by the corresponding AIDi is not in the virtual group indicated by Ci. (It is also possible to agree that the ith bit is 0, the table The STA indicating the corresponding AIDi indication is in the virtual group indicated by Ci, and the i-th bit is 1, indicating that the ST A indicated by the corresponding AIDi is not in the virtual group indicated by Ci. When K=5, there are 5 combinations, and the virtual identifier Ci occupies at least 3 bits. If the above K bits are used to indicate the bitmap, then there is only one value in the bitmap. We can use 0 bits to indicate the value of 0

When K=6, there are 15 combinations, and the virtual identifier occupies at least 4 bits, which is indicated by a bitmap of one bit. One implementation may be to first intercept the first 4 bits of the bitmap. If the first 4 bits of the bitmap have 2 1 or 4 1s, the combination of Ci is derived from the first 4 bits of the bitmap, that is, the first 4 bits of the bitmap have 2 1s, and the last 2 STAs are represented by Ci. In the combination; the first 4 bits of the bitmap have 4 1s, and the last 2 STAs are not in the combination represented by Ci. If there are three 1s in the first 4 bits of the bitmap, there are two cases, that is, the first or the second of the last two STAs is in the combination represented by Ci. When the first one of the last two STAs is in the combination indicated by Ci, then Ci is set equal to the first 4 bits of the bitmap; and when the second of the last two STAs is in the combination represented by Ci, Let Ci be equal to the result of bitwise inversion of the first 4 bits of the bitmap, so that there is only one 1 in Ci. At the receiving end, that is, the STA-side, after receiving the MU-MIMO group-defined domain signaling, the STA first determines the number of 1 out of 4 bits of Ci. The number of 1 is 2, then the first 4 STAs corresponding to the corresponding position (assuming 4 bits in sequence - corresponding to the first 4 STAs) and the last two STAs are in the virtual group; the number of 1 is 4, then corresponding The STA of the location is in the virtual group, and the last two STAs are not; the number of 1 is 3, then the corresponding location and the first of the last two STAs are in the virtual group; the number of 1 is 1, first The bit is inverted, then the 3 STAs in the corresponding position and the 2nd of the last two STAs are in In the virtual group. When K=7, there are 35 combinations, and the virtual identifier occupies at least 6 bits, which is indicated by a bit of a bit. The first 6 bits of the bitmap are first intercepted to represent Ci. After receiving the MU-MIMO group definition domain signaling, the STA determines the number of 1 out of 6 bits of Ci. The number of 1 is 3, then the corresponding location and the last STA are in the virtual group; the number of 1 is ⁴ , then the STA in the corresponding location is in the virtual group, and the last STA is absent. If K=9, there are 126 combinations, and the virtual identifier occupies at least 7 bits. The 7 bits of the virtual identity can represent all 126 combinations. When Κ=10, there are 210 combinations, and the virtual identifier occupies at least 8 bits, which is indicated by a bitmap of one bit. In use, the first 8 bits of the bitmap are intercepted. If the first 8 bits of the bitmap have 2 1 or 4 1s, the combination of the virtual identifiers is derived from the first 8 bits of the bitmap, that is, the first 8 bits of the bitmap have 2 1s, and the last 2 STAs are in the virtual identifier. In the combination of representations; the first 8 bits of the bitmap have 4 1s, and the last 2 STAs are not in the combination represented by the virtual identifier. If there are three 1s in the first 8 bits of the bitmap, there are two cases, that is, the first or the second of the last two STAs is in the combination indicated by the virtual identifier. When the first of the last two STAs is in the combination indicated by the virtual identifier, the virtual identifier is equal to the first 8 bits of the bitmap; and when the second of the last two STAs is in the combination indicated by the virtual identifier, let It is equal to the result of bitwise inversion of the first 8 bits of the bitmap, so that there are only five 1s in Ci.

After receiving the MU-MIMO group definition domain signaling, the STA first determines the number of 1 out of 8 bits of Ci. The number of 1 is 2, then the first 4 STAs corresponding to the corresponding position (assuming 4 bits in sequence - corresponding to the first 4 STAs) and the last two ST As are in the virtual group; the number of 1 is 4, then The STA of the corresponding location is in the virtual group, and the last two STAs are not; the number of 1 is 3, then the corresponding location is And the first one of the last two STAs is in the virtual group; the number of 1 is 5, and the bit is reversed bit by bit, then the 3 STAs in the corresponding position and the 2nd of the last two STAs are in the virtual group. in. When K=11, there are 330 combinations, and Ci takes at least 9 bits, which is indicated by a bit of a bit. First intercept the first 9 bits of the bitmap. If the first 9 bits of the bitmap have 2 1 or 4 1s, the combination of Ci is derived from the first 9 bits of the bitmap, that is, the first 9 bits of the bitmap have 2 1s, and the last 2 STAs are represented by Ci. In the combination; the first 9 bits of the bitmap have 4 1s, and the last 2 STAs are not in the combination represented by Ci. If there are three 1s in the first 9 bits of the bitmap, there are two cases, that is, the first or the second of the last two STAs is in the combination represented by Ci. When the first of the last 2 STAs is in the combination represented by Ci, let Ci be equal to the first 9 bits of the bitmap; and when the second of the last 2 STAs is in the combination represented by Ci, let Ci be equal to the bitmap. The first 9 bits are inverted by bit, so there are only 5 of 1 in Ci.

After receiving the MU-MIMO group definition domain signaling, the STA first determines the number of 1 out of 9 bits of Ci. The number of 1 is 2, then the first 4 STAs corresponding to the corresponding position (assuming 4 bits in sequence - corresponding to the first 4 STAs) and the last two ST As are in the virtual group; the number of 1 is 4, then The STAs in the corresponding location are in the virtual group, and the last two STAs are not present; the number of 1 is 3, then the corresponding location and the first of the last two STAs are in the virtual group; the number of 1 is 6, first The bitwise negation, then the 3 STAs in the corresponding position and the 2nd of the last two STAs are in the virtual group. When K=12, there are 495 combinations, Ci takes at least 9 bits; when K=13, there are 715 combinations, Ci takes at least 10 bits; K=14, there are 1001 combinations, Ci takes at least 10 bits; K There are 1365 combinations at =15, Ci takes at least 11 bits; when K=16, there are 1820 combinations, and Ci takes at least 11 bits. If the first 4 STAs are corresponding to any one of the subsets of all possible combinations. , a virtual Each location of the proposed group can only take one of a limited number of STAs; and the limited number of STAs described generally have similar spatial channel characteristics, so that replacing one with the other can still ensure multi-user MIMO. Performance.

Κ=5 , assuming that each STA is ABCDE. If ABCD can only be in the 1st to 4th positions of the virtual group, and E can only be in the 1st position, Ci will occupy at least 1 bit, indicating that the first one is A or E. If the ABCD can only be in the first to fourth positions of the virtual group, and E can be in all positions, then Ci takes at least 2 bits, indicating the position of E.

Κ=6 , assuming that each STA is ABCDEF. If ABCD can only be in the first to fourth positions of the virtual group, and E can only be in the first position, F can only be in the second position, then Ci takes at least 2 bits, indicating that the first one is A or E, and the second is B or F.

Κ=7 , assuming that each STA is ABCDEFG. If ABCD can only be in the first to fourth positions of the virtual group, and E can only be in the first position, F can only be in the second position, G can only be in the third position, then Ci should occupy at least 3 Bit, indicating that the first is A or E, the second is B or F, and the second is C or G. K=9, assuming that each STA is ABCDEFGffl. If the first position can only be A, E, I; the second position can only be B, F; the third position can only be C, G; the fourth position can only be D, H. Then, Ci occupies at least 5 bits, 2 bits indicate the STA of the 1st position, and STAs of the 2nd, 3rd, and 4th positions are each indicated by 1 bit. Other implementations of K values are easy to derive. In particular, we discuss K=16, assuming that each STA is ABCD EFGH IJKL MNOP. If the first position can only be Α, Ε, Ι, Μ; 2nd position Can only be B, F, J, N; The third position can only be C, G, K, 0; The fourth position can only be D, H, L, P. Then, Ci occupies at least 8 bits, and the STAs of the 1, 2, 3, and 4 positions are each indicated by 2 bits. Further, an implementation when the combination identifier is used for each Κ value other than 8 ( 5 < Κ < 16 ). When each virtual group is any of all possible combinations. For any K value, a bitmap containing K bits can be used as the combined identifier used when using the virtual group, and each bit corresponds to one AIIi (i=l, 2, ..., K). The i-th bit is 1, indicating that the STA indicated by the corresponding AIIi is in the virtual group indicated by Ci, and the i-th bit is 0, indicating that the STA indicated by the corresponding AIDi is not in the virtual group indicated by Ci. In particular, the number of the bitmaps is not always four, and may be three, two, or one, so that the scenario in which the number of STAs actually scheduled by the multi-user MIMO is less than 4 is obtained, thereby obtaining a higher flexibility. In practice, Ci can be used as the combined identifier used when using the virtual group. At this time, it is assumed that the virtual group always includes 4 STAs, and the above-mentioned multi-user MIMO group part (ie, CI, C2, ...) can be further implemented by some methods. Bit compression. Below we introduce two compression methods. To be confused with the compression method proposed above, it is referred to herein as a multi-user MIMO group recompression method. It is assumed that the maximum number of multi-user MIMO groups that may occur is N, and each multi-user MIMO group is represented by n bits, and the number of multi-user MIMO groups actually used is x. Still further, an optimized implementation is presented to recompress the bits. The order of the multi-user MIMO combination corresponding to the virtual identifier Ci is agreed, so that the effects of the X used MIMO user combinations and the enumerated (Nx) disabled MIMO user groups are The same. The contractual relationship may be one of the rules - mapping. When K = 8 and M=4, 70 combinations and 7 bits form a virtual identifier as an example. The correspondence of a single cartridge can be as shown in Table 1: The sequence consisting of 8 binary numbers in the first column It is indicated that the ith binary number in the sequence indicates the selection of the ith STA, and when it takes 1 or 0, it indicates that the corresponding STA is selected or not selected. The first column arrangement is arranged from top to bottom in a binary sequence from small to large. A sequence consisting of the remaining 7 binary numbers after the last bit of the binary sequence in the first column is removed can be used as a representation of the multi-user MIMO group. The multi-user MIMO group representation of the second column corresponds to CI, C2, and C70 from top to bottom. Table 1 Example of the relationship between Ci and multi-user MIMO group

STA selection Multi-user MIMO group representation Ci

00001111 0000111 C1

00010111 0001011 C2

00011011 0001101 C3

00011101 0001110 C4

00011110 0001111 C5

00100111 0010011 C6

11110000 1111000 C70 When x > N/2, it is apparent that (Nx) disabled MIMO user groups will use fewer bits. Therefore, an additional enable/disable indication bit can be set to indicate whether the listed MIMO user group is allowed or prohibited. For example, 0 means that the group is allowed to be used, and 1 means that the group is prohibited. In practice, the opposite can also be made. Agreement). Thus, when x <= N/2, the enable/disable indication bit can be set to 0, and all MIMO user groups allowed to be used are enumerated; thus, when x>N/2, the enable/disable indication bit can be set to 1, And list all MIMO user groups that are forbidden to use. For example, when i = 64, if the multi-user MIMO group recompression method is not required to use 7*64 = 448 bits, and after the multi-user MIMO group recompression method is used, l+n*(Nx) = 1+7*(70-64) = 43bits to indicate that 1 bit is the enable/disable indication bit. Another compression method, the virtual identification (CI, C2, Cx), the X allowed MIMO user groups are selected from N possible MIMO user groups, and each Ci cannot be duplicated with other MIMO user groups. Therefore, according to this feature, bit compression of a multi-user MIMO group can be performed. If there is no agreement on the order in which CI, C2, ..., CN appear, then the number of possible occurrences of virtual identifiers (C1, C2, Cx) is to extract x samples from the library containing N samples. The number of permutations, that is, ^{lc g 2} ( ^PN ) bits can be used to represent the X allowed MIMO user groups CI, C2, Cx; if the order of the virtual identifiers (CI, C2, Cx) has been agreed upon (ie, once Ci and Cj appear, if i<j, there must be Ci before Cj), then the number of possible cases of CI, C2, Cx is the combination of extracting X samples from the library containing N samples. The number, that is, ^^(^) bits can be used to represent the X allowed MIMO user groups CI, C2, Cx. Where " ^X 1 represents the rounding up of X. Here is an example to illustrate the non-recompression and recompression after the multi-user MIMO group. Make a representation. 4 Set x=2, and have determined the order in which CI, C2, and CN appear. Read the following table:

A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium, the program When executed, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

Claims

Rights request

A method for transmitting data by a multi-user MIM0 system, the method comprising: transmitting a signaling frame, where the signaling frame includes: a user group serial number Group ID, K user terminal identifiers, and a virtual identifier The user group serial number Group ID identifies a user group composed of the K user terminals, and the K user terminal identifiers respectively correspond to K user terminals, and the virtual identifiers are used to indicate the K user terminals. a combination of user terminals composed of any M terminal users;

The data is transmitted, and the transmitted data is received by an end user of a combination of M STAs indicated by the virtual identifier.

A method for transmitting data by multi-user MIMO, the method comprising: sending a user group serial number Group ID and K user terminal identifiers, wherein the one user terminal identifiers respectively correspond to one user terminal The user group serial number Group ID identifies the user group formed by the user terminals;

Send a virtual identifier;

send data;

The virtual identifier indicates a user terminal combination composed of any M terminal users of the K user terminals, and the sent data is received by a terminal user in a combination of M terminals indicated by the virtual identifier;

Where K is greater than M, M is the number of user terminals supported by the system; the number of virtual identifiers is a natural number less than or equal to.

Sending a combined identifier, where the combined identifier is used to determine that the combined identifier indicates the K user terminals M user terminals in ;

Transmitting data, and the sent data is received by the M user terminals determined by the combined identifier;

A device for transmitting data in a multi-user MIMO system, comprising: a unit for transmitting a signaling frame, configured to send the signaling frame, where the signaling frame includes: a user group serial number Group ID, K User terminal identifiers and virtual identifiers;

The user group serial number Group ID identifies a user group composed of the K user terminals, and the K user terminal identifiers respectively correspond to K user terminals, and the virtual identifiers indicate the K user terminals. a combination of user terminals consisting of any M terminal users, Κ greater than Μ, Μ is the number of user terminals supported by the system; the number of the virtual identifiers is a natural number less than or equal to;

And a unit for transmitting data, configured to send data, where the sent data is received by an end user in a combination of M STAs indicated by the virtual identifier.

5. A device for transmitting data by a multi-user MIMO, comprising:

The sending unit is further configured to send a virtual identifier and data;

The virtual identifier indicates a combination of user terminals composed of any M terminal users of the K user terminals, and the sent data is received by a terminal user in a combination of M STAs indicated by the virtual identifier;

6. A device for transmitting data by multi-user MIMO, comprising: a first sending unit, configured to send a user group serial number Group ID and a K user terminal identifier, where the user terminal identifiers respectively correspond to one user terminal, and the user group serial number Group ID identifies the K a user group composed of user terminals;

a second sending unit, configured to send a combined identifier, where the combined identifier is used to determine that the combined identifier indicates the M user terminals of the K user terminals;

a third sending unit, configured to send data, where the sent data is received by the M user terminals determined by the combined identifier;