WO2012031545A1

WO2012031545A1 - Method and device for realizing spatial division multiple access

Info

Publication number: WO2012031545A1
Application number: PCT/CN2011/079346
Authority: WO
Inventors: 姜艳平; 李文俊; 容荣; 周元
Original assignee: 华为技术有限公司
Priority date: 2010-09-07
Filing date: 2011-09-05
Publication date: 2012-03-15
Also published as: CN102404027B; CN102404027A

Abstract

Disclosed are a method and a device for realizing spatial division multiple access, which relate to wireless broadband access technologies and are provided for reducing the processing complexity. The method comprises: selecting, according to collected antenna array information, spatial division multiple access grouped user terminals (11); controlling an antenna array, and forming beams directed to the spatial division multiple access grouped user terminals (12); and sending, according to the beams, data directionally to the spatial division multiple access grouped user terminals (13). Embodiments of the present invention are mainly used for wifi networks.

Description

Method and apparatus for realizing space division multiplexing This application claims priority from a Chinese application filed on September 7, 2010, with application number 201010274369.3, and the invention titled "A Method and Apparatus for Achieving Space Division Multiplexing" The entire contents of which are incorporated herein by reference. Technical field

The present invention relates to a wireless broadband access technology, and more particularly to a method and apparatus for implementing space division multiplexing. Background technique

With the large-scale deployment of the wifi network, the interference problem between users becomes more and more serious, which seriously reduces the link rate and performance, and the wifi network itself is limited by the transmission range of the AP (Access Point), so that the area The internal AP deployment is too dense, which increases the deployment cost and greatly degrades the performance of the wifi network.

定向 Directional transmission (beamforming) can increase coverage and effectively avoid unnecessary interference. Since directional transmission introduces a degree of freedom in space, SDMA (Space Division Multiple Access) communication can be implemented, so that the AP can simultaneously communicate with at least two users on the same channel at the same time (can simultaneously The users of the communication form an SDMA packet), thereby greatly improving the throughput of the wifi system.

Currently, baseband beamforming can be used to implement space division multiplexing. First, the members of the space division multiplexing group are selected according to different priority policies, and then the channel is kept silent for a period of time, and channel state information of each group member is sequentially acquired (CSI). : channel state information ), then calculate the beamforming weights according to the CSI, and use the corresponding weights to send and receive signals.

In the process of implementing the present invention, the inventors have found that the use of baseband beamforming to achieve space division multiplexing requires known channel state information, and the current commercial wifi chip is difficult to obtain channel state information, so the wifi chip needs to be modified. The wifi chip that needs to be modified performs a series of matrix calculations for channel estimation and beamforming weights, and the processing complexity is high. Summary of the invention

Embodiments of the present invention provide a method and device for implementing space division multiplexing, which can reduce the complexity of processing.

The embodiment of the invention uses the following technical solutions:

A method for implementing space division multiplexing, including:

Selecting a user terminal of the space division multiplexing group according to the collected antenna array information;

Controlling an antenna array to form a beam directed to the space division multiplexed packet user terminal;

Transmitting data to the user terminal of the space division multiplexed packet according to the beam.

A device for implementing space division multiplexing, including an antenna array;

An antenna array information collecting unit, configured to collect antenna array information;

a user selection unit, configured to select a user terminal of the space division multiplexing group according to the antenna array information;

An antenna array control unit, configured to control the antenna array to form a beam directed to the space division multiplexing packet user terminal selected by the user selection unit;

And a transceiver control unit, configured to directionally send data to the user terminal of the space division multiplexing packet according to the formed beam.

According to the technical solution of the embodiment of the present invention, the user terminal of the space division multiplexing packet is selected by using the collected antenna array information, and the antenna array is controlled to form a beam directed to the space division multiplexing packet user terminal, and then according to the beam direction The user terminal of the space division multiplexing packet directionally transmits data, so that the antenna array information can be directly used for space division multiplexing grouping and beamforming. Compared with the prior art, since the antenna array information is easy to collect, no known channel state is needed. Information, so there is no need to modify common commercial wifi chips, thus reducing the complexity of processing.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, a brief description of the drawings to be used in the description of the embodiments will be given below.

FIG. 1 is a flowchart of a method for implementing space division multiplexing according to an embodiment of the present invention; 2 is a schematic diagram of sending data to each user terminal in an SDMA packet before performing a padding process according to an embodiment of the present invention;

3 is a structural diagram of a device for implementing space division multiplexing according to an embodiment of the present invention;

FIG. 4 is a structural diagram of another apparatus for implementing space division multiplexing according to an embodiment of the present invention; FIG. 5 is a communication flowchart of a device for implementing space division multiplexing according to an embodiment of the present invention. detailed description

In a WLAN (Wireless Local Area Network) system, the RF beamforming of the antenna array can be used to achieve space division multiplexing. Since spatial multiplexing multiplexing and beamforming are directly performed using the antenna array information, known channel state information is not required, so that it is not necessary to modify a common commercial wifi chip, thereby reducing processing complexity.

The technical solutions in the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings in the embodiments.

The embodiment of the present invention provides a method for implementing space division multiplexing for a WLAN network. As shown in FIG. 1 , the method for implementing space division multiplexing according to the embodiment of the present invention mainly includes:

Step 11: Select the user terminal of the space division multiplexing group according to the collected antenna array information.

The following two conditions must be met to form an SDMA packet:

(1) The interference between user terminals is relatively small; (2) The throughput is increased in SDMA communication. For condition (1), there are N (the number of 2 N maximum communication peers) that interfere with each other in accordance with the preset conditions, satisfying:

User terminal 1 Received signal strength indication acknowledgment signal under a certain beam ACK RSSI

(Received Signal Strength Indicator) is very large, and the ACK RSSI of the user terminals 2, 3 N under this beam is small;

The ACK RSSI 4 of the user terminal 2 under a certain beam is large, and the ACK RSSI 4 of the user terminals 1, 3 N under this beam is small; The ACK RSSI of the user terminal N under a certain beam is large, and the ACK RSSI of the user terminal 1, 2 N-1 under this beam is small;

Moreover, the patterns corresponding to the above beams of the user terminals 1, 2 N are spatially isolated better. For example, if the main lobe of the user terminal 1 in the beam pattern overlaps with the user terminal 2, for example, 50% of the main lobe of the beam pattern, then the two user terminals are not suitable for forming an SDMA packet.

That is, for the N user terminals, the ACK RSSI of the non-SDMA of any user terminal under a certain beam is greater than the ACK RSSI of the non-SDMA of the other N-1 user terminals under the beam, and The angle overlap between the 3db beamwidth of the user terminal in the beam pattern and the 3db beamwidth of the other N-1 user terminals in the beam pattern is less than a set threshold, for example less than 10 degrees.

The overlap portion described above can be judged by using the overlap angle. For example, user 1's 3db beamwidth is from 60 degrees to 100 degrees, and the width is 40 degrees. User 2's 3db beamwidth is from 70 degrees to 90 degrees, and the width is 20 degrees. The overlap angle between the two users is 20 degrees.

For condition (2), it is to compare whether the total rate of composing SDMA communication is greater than the sum of the rates corresponding to the optimal beam for non-SDMA communication. If the total rate is large, it is considered that there is gain in throughput during SDMA communication.

Specifically, for the user terminals that meet the preconditions of the N conditions that satisfy the above condition (1), each user terminal is calculated according to the ACK RSSI corresponding to different beams when the N user terminals are not SDMA. SNR (Signal to Noise Ratio) for non-SDMA and SINR (Signal to Interference plus Noise Ratio) for SDMA;

According to the SNR and the SINR and the rate corresponding to the optimal beam, the respective rates rl, r2, ... rN of the 1, 2, ... N user terminals SDMA are obtained;

Obtaining the total rate of the N user terminals SDMA according to the total rate r_sdma=N*min(rl, r2, r3 ... rN);

The total rate r_sdma at the N user terminals SDMA > the optimal beam of the user terminal 1 When the rate rl_max+...+ the rate rN_max under the N-optimal beam of the user terminal, the N user terminals are grouped into SDMA packets.

It is necessary to explain that the judgment of the SDMA packet needs to be based on certain antenna array information. The antenna array information includes: User terminal non-SDMA (non-SDMA, the transmitting end uses the directional transmission mode, and only the same frequency point at the same time The ACK RSSI corresponding to different beams when communicating with one user terminal, the optimal beam when the user terminal is non-SDMA, and the rate corresponding to the optimal beam. The optimal beam refers to the beam when the user rate is optimal.

Since there is no antenna array history information at the beginning, it is necessary to first communicate with the user terminal for a period of time, and collect these antenna array information. In addition, after the antenna array and the control unit are designed, it is necessary to obtain the pattern information of different switch combinations of the antenna array by the darkroom test method, so as to perform RF beamforming of the SDMA group.

Step 12: Control the antenna array to form a beam directed to the space division multiplexed packet user terminal. The antenna array of the embodiment of the present invention is composed of a series of directional antenna units with switches. Each of the transceiver units has an antenna switch connected to the antenna of the antenna array, and can be formed by controlling the on/off of the antenna switch of the antenna array. The beam pointing to the SDMA packet user terminal achieves the purpose of RF beamforming.

It should be noted that the beam used for each user terminal in the SDMA communication at this time is the beam determined in the above condition (1). Once the beam is determined, the on/off of the corresponding antenna switch of the antenna array is determined.

Step 13: According to the beam, send data to the user terminal of the space division multiplexing group. When the sender sends SDMA data, it does not want other terminals to compete for the channel. Otherwise, collision will occur, which affects normal SDMA communication. Therefore, it is necessary to use certain measures to ensure that the channel is occupied by the sender for a period of time. In the embodiment of the present invention, before the SDMA data packet is sent, the channel is kept silent for a period of time: a DTIM (Delivery Traffic Indication Message) is sent first, and a DTIM includes a broadcast bit. When set to 1, all terminals are used. Will wait for a broadcast frame; then send the CTS-to-self broadcast frame immediately. CTS-to-self frame is wireless LAN A special CTS (Clear To Send) frame defined by the standard protocol, that is, the receiving end address of the CTS frame is the same as the address of the CTS transmitting end. The CTS-to-self frame is set for a period of time. All terminals that receive this frame will not send uplink information during this time, and will not affect normal SDMA communication.

In addition, each user terminal in the SDMA packet may cause a different transmission time (transmission time = packet length/rate) due to the difference in packet length and rate, as shown in FIG. When the data packet of the user terminal 2 is still being transmitted, the user terminal 1 replies with an ACK frame, which causes interference at the transmitting end.

In order to avoid the above situation, the sender needs to fill the data packets to be sent, so that the sending time of each data packet is the same. There are two possible processing methods:

(1) If each user terminal in the SDMA packet uses the same rate, it is necessary to ensure that the data packet is as long. When the packet length is different, padding 0 after the short packet;

(2) If each user terminal in the SDMA packet uses a different rate, it is necessary to ensure that the transmission time is as long. When the packet length is not appropriate, padding 0 after the packet.

After the above filling process, the transmission time of each user terminal data packet can be ensured, so that the transmitting end can simultaneously send data to the user terminal of the SDMA packet, so that the transmitting end can be connected to at least two user terminals on the same channel at the same time. Simultaneous communication, thereby improving the coverage and capacity of the wifi system without adding additional frequency resources.

It should be noted that, when selecting a user terminal of an SDMA packet according to the collected antenna array information, multiple SDMA packets may be obtained, and then the rate of the space division multiplexed packet and the service priority of the space division multiplexed packet may be determined. The order in which multiple SDMA packets are sent. Specifically, there are two ways to determine the order in which multiple SDMA packets are sent:

One way is to maximize throughput, taking into account QoS: determining the order in which SDMA packets are sent according to the rate of SDMA packets (eg determining the order in which SDMA packets are sent in descending order of SDMA packets), and at the rate of SDMA packets When the same, the transmission order of the SDMA packets is determined according to the service priority of the SDMA packet (for example, from high to low); Another way may be to prioritize QoS, taking into account throughput: determining the order in which SDMA packets are sent according to the service priority of the SDMA packets (eg, from high to low), and the highest or lowest rate of SDMA packets, such as according to SDMA packets. The order of the SDMA packets is determined.) The traffic priority of the SDMA packets is determined by the highest service priority of the user terminals within the SDMA packets.

In addition, in the process of performing SDMA communication, it is necessary to perform an update of the SDMA packet, for example, the user terminal 1 moves so that it is no longer suitable to form an SDMA packet with the user terminal 2. The basis for judging the update is:

After a certain SDMA packet communication for a period of time, obtaining an average packet error rate of the SDMA packet; when the average packet error rate of the SDMA packet is greater than or equal to a set threshold, for example, 50%, a user terminal that needs to modify the SDMA packet .

The method for obtaining the average packet error rate of the SDMA packet is that after each user terminal in the SDMA packet receives the data packet sent by the sender, the short interframe space (SIFS, a time length specified by the 802.11 protocol standard) The time reply ACK frame to the transmitting end, and the transmitting end can count the packet error ratio PER (Packet Error Ratio) of each communication terminal according to the ACK frame.

In summary, the method for implementing space division multiplexing according to an embodiment of the present invention selects a user terminal of an SDMA packet by using the collected antenna array information, and controls the antenna array to form a beam directed to the SDMA packet user terminal, and then according to the The beam is directed to transmit data to the user terminal of the SDMA packet, so that SDMA packet and beamforming can be directly performed according to the antenna array information. Compared with the prior art, since the antenna array information is easy to collect, no known channel state information is needed. There is no need to design a wifi chip suitable for SDMA packets, and a common commercial wifi chip can meet the requirements, thus reducing the complexity of processing.

At the same time, the embodiment of the present invention further provides a communication device, which performs the above method, and each step in the foregoing method can be applied to the device.

As shown in FIG. 3, the device for implementing space division multiplexing according to an embodiment of the present invention includes an antenna array 31, Transceiver unit 35, and

An antenna array information collecting unit 32, configured to collect antenna array information;

a user selection unit 33, configured to select a user terminal of the space division multiplexing group according to the antenna array information;

The antenna array control unit 34 is configured to control the antenna array 31 to form a beam directed to the space division multiplexing group user terminal;

The transceiver control unit 36 is configured to control, according to the formed beam, the transceiver unit 35 to send data to the user terminal of the space division multiplexing packet.

The transceiver unit 35 is at least two, and each transceiver unit is connected to the same antenna array 31 by using different antenna switches. Each transceiver unit can implement standard WLAN standard protocol PHY (physical layer) and MAC (Media Access Control) functions; the number of transceiver units determines the maximum number of SDMA user terminals, which is the number of user terminals in the SDMA packet. The upper limit.

The antenna array information collected by the antenna array information collecting unit 32 includes: an ACK RSSI corresponding to different beams when the user terminal is non-SDMA, an optimal beam when the user terminal is non-SDMA, and a rate corresponding to the optimal beam, where The optimal beam refers to the beam when the user's rate is optimal.

The user terminal that selects the SDMA packet by the user selection unit 33 includes:

Select N user terminals, where 2 N the maximum number of communication peers;

Obtaining a total rate when the N user terminals are SDMA according to the ACK RSSI corresponding to different beams of the N user terminals during non-SDMA;

When the total rate of the N user terminals SDMA is greater than the sum of the rates corresponding to the optimal beams of each user terminal, the N user terminals are grouped into SDMA packets.

The antenna array structure shown in FIG. 3 is composed of a series of directional antenna units. Each transceiver unit has an antenna switch connected to the antenna array antenna, and the antenna array control unit 34 controls the on/off of the antenna switch. The required beams are formed to achieve the purpose of RF beamforming, and different antenna switch combinations form different beam patterns corresponding to different patterns. Further, referring to FIG. 4, the device for implementing space division multiplexing according to the embodiment of the present invention may further include:

The packet selecting unit 41 is configured to determine a sending sequence of the plurality of SDMA packets according to a rate of the SDMA packet and a service priority of the SDMA packet when the selectable space division multiplexing packet is multiple.

Specifically, the packet selection unit can:

Determining the transmission order of the SDMA packets according to the order of the SDMA packets from high to low), and determining the transmission order of the SDMA packets according to the service priority (for example, from high to low) of the SDMA packets when the rates of the SDMA packets are the same; ,

It may be further configured to determine a transmission order of the SDMA packets according to a service priority of the SDMA packet (for example, from high to low), and determine a transmission order of the SDMA packets according to a rate of the SDMA packets when the service priorities of the SDMA packets are the same, ( For example, determining the order in which the SDMA packets are transmitted according to the order of the SDMA packets from high to low);

The service priority of the SDMA packet is determined by the highest service priority of the user terminal in the group.

Further, still referring to FIG. 4, the device for implementing space division multiplexing according to the embodiment of the present invention may further include:

The updating unit 42 is configured to acquire an average packet error rate of the SDMA packet user terminal, and modify the user terminal of the SDMA packet when the average packet error rate of the SDMA packet user terminal is greater than or equal to a set threshold. The basis for judging the update is:

After a certain SDMA packet communication for a period of time, obtaining an average packet error rate of the SDMA packet; when the average packet error rate of the SDMA packet is greater than or equal to a set threshold, for example, 50%, modifying the user of the SDMA packet terminal.

In addition, due to the difference in packet length and rate of each user terminal in the SDMA packet, the transmission time (transmission time = packet length/rate) is different, and interference occurs at the transmitting end. For To avoid the above situation, preferably, the transceiver control unit 36 is further configured to perform a filling process on the data packets to be sent before the data is simultaneously transmitted to the users in the SDMA packet, so that the sending time of each data packet is the same. There are two possible ways to do this:

One is to ensure that the data packets are as long as the user terminals in the SDMA packet use the same rate. When the packet length is different, padding 0 after the short packet;

The other is to ensure that the transmission time is as long as each user terminal in the SDMA packet uses a different rate. When the packet length is not appropriate, padding 0 after the packet.

After the above filling process, the transmission time of each user terminal data packet can be ensured to be the same.

A specific communication process of the device for implementing space division multiplexing according to an embodiment of the present invention is shown in FIG. 5. Since the device does not have any historical information at the beginning, the SDMA packet cannot be selected, and SDMA communication cannot be performed. Therefore, non-SDMA communication is required for a period of time, and the antenna array information collecting unit collects information about the antenna array during this period; The packet selection unit and the user selection unit determine the user terminals of all possible SDMA packets according to the antenna array information, and then further select one of the SDMA packets for communication according to the designed criteria; the transceiver control unit controls the transceiver unit to transmit the CTS-to-self broadcast frame pre- Retaining a wireless channel; the antenna array control unit controls the antenna array to form a beam directed to the selected spatial division multiplexing packet user terminal according to the collected antenna array information; the transceiver control unit controls the plurality of transceiver units to transmit data directionally; the user terminal receives the data Then, the ACK is returned; the antenna array information collecting unit continues the next round of SDMA communication according to the antenna array information required for ACK collection.

The antenna array information collected by the antenna array information collecting unit mainly includes: a beam pattern of different switch combinations of the antenna array (after the antenna array and the control unit are designed, the information can be obtained by the darkroom test method), when the non-SDMA communication is performed. The ACK RSSI corresponding to different beams, the optimal beam, the rate r_max corresponding to the optimal beam, and the average packet error rate PER during SDMA communication.

The device for implementing space division multiplexing according to the embodiment of the present invention collects antenna array information when communicating with the user terminal by using the antenna array information collecting unit, and the user selection unit selects the user terminal of the space division multiplexing group according to the antenna array information, An antenna array control unit controls the antenna array to form a pointing The user selects a beam of the space division multiplexing packet user terminal selected by the unit, and then the transceiver unit controls the transceiver unit to transmit data to the user terminal of the space division multiplexing group according to the formed beam, thereby directly according to the antenna array. The information is spatially multiplexed and beamformed. Compared with the prior art, since the antenna array information is easy to collect, no known channel state information is needed, and it is not necessary to design a wifi chip suitable for space division multiplexing. The chip can meet the requirements, thus reducing the complexity of the process.

It can be understood by those skilled in the art that the functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. And all or part of the steps of implementing the foregoing method embodiments may be performed by hardware related to the program instructions. The foregoing program may be stored in a computer readable storage medium, and when executed, the program includes the steps of the foregoing method embodiments. The foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

The above specific embodiments are not intended to limit the present invention, and any modifications, equivalents, improvements, etc., which are included in the present invention, should be included in the present invention without departing from the principles of the present invention. Within the scope of protection.

Claims

Claim

A method for implementing space division multiplexing, comprising:

The method according to claim 1, wherein the collected antenna array information comprises: a received signal strength indication acknowledgment signal ACK corresponding to different beams when the user terminal is not spatially multiplexed.

RSSI, the optimal beam when the user terminal is not spatially multiplexed and the rate corresponding to the optimal beam. The optimal beam refers to the beam when the user rate is optimal.

The method according to claim 2, wherein the selecting, by the antenna array information, the user terminal that selects the spatial division multiplexing packet comprises:

Select N user terminals, where 2 N the maximum number of communication peers;

Obtaining, according to the ACK RSSI corresponding to different beams of the N user terminals that are not spatially multiplexed, obtaining the total rate when the N user terminals are spatially multiplexed;

When the total rate of space division multiplexing of the N user terminals is greater than the sum of the rates corresponding to the optimal beams of each user terminal, the N user terminals are grouped into space division multiplexing packets.

4. The method according to claim 3, wherein the method for selecting N user terminals comprises:

For the N user terminals, the ACK RSSI of the non-space division multiplexing of any user terminal under a certain beam is greater than the ACK RSSI of the non-space division multiplexing of the other N-1 user terminals under the beam, And the angle overlap between the 3db beamwidth of the user terminal in the beam pattern and the 3db beamwidth of the other N-1 user terminals in the beam pattern is less than the set threshold.

The method according to claim 3, wherein, when the N user terminals are spatially multiplexed according to ACK RSSI corresponding to different beams when the N user terminals are not spatially multiplexed, The total rate includes:

According to the ACK RSSI corresponding to different beams when the N user terminals are not spatially multiplexed, Signal-to-noise ratio SNR for each user terminal when non-space-division multiplexing and signal-to-interference plus noise ratio SINR for space division multiplexing;

Obtaining respective rates of the N user terminals in space division multiplexing according to the SNR and the SINR and the rate corresponding to the optimal beam of the N user terminals;

And determining, according to respective rates of the N user terminals during space division multiplexing, a total rate when the N user terminals are spatially multiplexed.

The method according to claim 1, wherein the controlling the antenna array to form a beam directed to the space division multiplexed packet user terminal comprises:

A beam directed to the space division multiplexed packet user terminal is formed by controlling the on and off of the antenna switch of the antenna array.

The method according to claim 1, wherein before the data is sent to the user terminal of the spatial multiplexing packet according to the beam, the method further includes:

The packets to be sent are padded so that the transmission time of each packet is the same.

The method according to any one of claims 1-7, wherein the method further comprises: when the selected spatial division multiplexing packet is multiple, according to the rate and space division of the space division multiplexing packet The order in which the plurality of space division multiplexed packets are transmitted is determined by the packet priority of the packet.

The method according to claim 8, wherein the determining, according to the rate of the space division multiplexing packet and the service priority of the space division multiplexing packet, the sending sequence of the plurality of space division multiplexing packets comprises: Determining, according to a rate of the space division multiplexing packet, a transmission order of the space division multiplexing packet, and determining a transmission order of the space division multiplexing packet according to a service priority of the space division multiplexing packet when the rates of the space division multiplexing packets are the same;

Or determining a transmission sequence of the space division multiplexing packet according to a service priority of the space division multiplexing packet, and determining a space division multiplexing packet according to a rate of the space division multiplexing packet when the service priorities of the space division multiplexing packets are the same The order of delivery.

The method according to claim 8, wherein the method further comprises: obtaining an average packet error rate of the space division multiplexing packet user terminal; When the average packet error rate of the space division multiplexing packet user terminal is greater than or equal to a set threshold, the user terminal of the space division multiplexing packet is modified.

11. A device for implementing space division multiplexing, comprising an antenna array and a transceiver unit, further comprising:

a user selection unit, configured to select a user terminal of the space division multiplexing group according to the antenna array information; and an antenna array control unit, configured to control the antenna array to form an air separation point corresponding to the selection of the user selection unit Using a beam of a packet user terminal;

And a transceiver control unit, configured to control, according to the formed beam, the transceiver unit to send data to the user terminal of the space division multiplexing packet.

12. The device according to claim 11, wherein the device comprises at least two transceiver units, and each transceiver unit is connected to the same antenna array by using different antenna switches.

The device according to claim 12, wherein the antenna array information collected by the antenna array information collecting unit comprises: a received signal strength indication acknowledgement signal ACK RSSI corresponding to different beams when the user terminal is not spatially multiplexed. The optimal beam and the rate corresponding to the optimal beam when the user terminal is not spatially multiplexed, wherein the optimal beam refers to the beam when the user rate is optimal.

The device according to claim 13, wherein the user terminal that selects the spatial multiplexing packet by the user selection unit comprises:

Select N user terminals, where 2 N the maximum number of communication peers;

15. Apparatus according to claim 14 wherein:

The transceiver control unit is further configured to: before transmitting the data to the user terminal of the space division multiplexing group according to the formed beam, perform filling processing on the data packet to be sent to make each data packet The sending time is the same.

The device according to any one of claims 11-15, wherein the device further comprises: a packet selecting unit, configured to: according to the space division multiplexing group when the selected spatial multiplexing packet is multiple The rate and the service priority of the space division multiplexed packet determine the transmission order of the plurality of space division multiplexed packets.

The device according to claim 16, wherein the packet selection unit determines a transmission order of the space division multiplexed packet according to a rate of the space division multiplexed packet, and when the rates of the space division multiplexed packets are the same, Determining, according to the service priority of the space division multiplexing packet, a transmission sequence of the space division multiplexing packet; or, the packet selection unit determines a transmission order of the space division multiplexing packet according to a service priority of the space division multiplexing packet, and is empty When the service priorities of the sub-multiplexed packets are the same, the transmission order of the space-division multiplexed packets is determined according to the rate of the space-division multiplexed packets.

The device according to claim 16, wherein the device further comprises: an updating unit, configured to acquire an average packet error rate of the space division multiplexing packet user terminal, and use the space division multiplexing packet user When the average packet error rate of the terminal is greater than or equal to the set threshold, the user terminal of the space division multiplexing packet is modified.