CN102404027B - Method and device for achieving space division multiplexing - Google Patents
Method and device for achieving space division multiplexing Download PDFInfo
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- CN102404027B CN102404027B CN201010274369.3A CN201010274369A CN102404027B CN 102404027 B CN102404027 B CN 102404027B CN 201010274369 A CN201010274369 A CN 201010274369A CN 102404027 B CN102404027 B CN 102404027B
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- H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
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Abstract
An embodiment of the invention discloses a method and a device for achieving space division multiplexing, which relate to wireless broadband access technology and used for reducing processing complexity. The method comprises the steps of selecting space division multiplexing grouped user terminals according to collected antenna array information, controlling antenna array to form wave beams pointing to the space division multiplexing grouped user terminals, and directionally sending data to space division multiplexing grouped user terminals according to the wave beams. The method and the device for achieving the space division multiplexing are mainly used for wireless fidelity (wifi) networks.
Description
Technical Field
The present invention relates to wireless broadband access technologies, and in particular, to a method and an apparatus for implementing space division multiplexing.
Background
With the large-scale deployment of the wifi network, the problem of interference between users becomes more and more serious, the rate and performance of a link are seriously reduced, and the wifi network is limited by the transmission range of an AP (Access Point), so that the AP deployment in an area is too intensive, the deployment cost is increased, and the performance of the wifi network is greatly reduced.
The coverage area can be enlarged by adopting directional transmission (beam forming), and unnecessary interference can be effectively avoided. Because the directional transmission introduces a degree of freedom in space, SDMA (Spatial division multiple Access) communication can be realized, so that the AP can simultaneously communicate with at least 2 users (the users that can simultaneously communicate form an SDMA packet) on the same channel at the same time, thereby greatly improving the throughput of the wifi system.
At present, space division multiplexing can be realized by utilizing baseband beamforming, members of space division multiplexing packets are selected according to different priority strategies, then a channel is silenced in a period of time, Channel State Information (CSI) of each packet member is sequentially acquired, beamforming weights are calculated according to the CSI, and corresponding weights are adopted to send and receive signals.
In the process of implementing the invention, the inventor finds that space division multiplexing is implemented by utilizing baseband beamforming, known channel state information is required, but the current common commercial wifi chip is difficult to acquire the channel state information, so the wifi chip needs to be modified, and in addition, the modified wifi chip is required to perform a series of matrix calculations of channel estimation and beamforming weights, so the processing complexity is high.
Disclosure of Invention
Embodiments of the present invention provide a method and an apparatus for implementing space division multiplexing, which can reduce processing complexity.
The embodiment of the invention adopts the following technical scheme:
a method of implementing space division multiplexing, comprising:
selecting space division multiplexing grouped user terminals according to the collected antenna array information;
controlling an antenna array to form a beam pointing to the space division multiplexing packet user terminal;
and directionally transmitting data to the user terminal of the space division multiplexing grouping according to the wave beam.
An apparatus for implementing space division multiplexing includes an antenna array;
the antenna array information collection unit is used for collecting antenna array information;
a user selection unit, configured to select a space division multiplexing grouped user terminal according to the antenna array information;
an antenna array control unit for controlling the antenna array to form a beam pointing to the space division multiplexing packet user terminal selected by the user selection unit;
and the transceiving control unit is used for directionally transmitting data to the user terminal of the space division multiplexing grouping according to the formed wave beam.
According to the technical scheme of the embodiment of the invention, the user terminal of the space division multiplexing grouping is selected through the collected antenna array information, the antenna array is controlled to form the wave beam pointing to the user terminal of the space division multiplexing grouping, and then the data is directionally sent to the user terminal of the space division multiplexing grouping according to the wave beam, so that the space division multiplexing grouping and the wave beam forming can be directly carried out by utilizing the antenna array information.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below.
Fig. 1 is a flowchart of a method for implementing space division multiplexing according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating data transmission to each user terminal in an SDMA packet before stuffing according to an embodiment of the present invention;
fig. 3 is a structural diagram of an apparatus for implementing space division multiplexing according to an embodiment of the present invention;
fig. 4 is a block diagram of another apparatus for implementing space division multiplexing according to an embodiment of the present invention;
fig. 5 is a communication flow diagram of an apparatus for implementing space division multiplexing according to an embodiment of the present invention.
Detailed Description
In a WLAN (Wireless Local Area Network) system, space division multiplexing can be implemented by using radio frequency beamforming of an antenna array. Because the space division multiplexing grouping and the beam forming are directly carried out by utilizing the antenna array information, the known channel state information is not needed, and therefore, a common commercial wifi chip is not needed to be modified, and the processing complexity can be reduced.
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
An embodiment of the present invention provides a method for implementing space division multiplexing for a WLAN network, and as shown in fig. 1, the processing at an access device AP in the method for implementing space division multiplexing provided by the embodiment of the present invention mainly includes:
and step 11, selecting the user terminal of the space division multiplexing grouping according to the collected antenna array information.
The constituent SDMA packets must satisfy both of the following conditions:
(1) interference between user terminals is relatively small; (2) there is a gain in throughput in SDMA communications.
For the condition (1), N user terminals (N is more than or equal to 2 and less than or equal to the number of the maximum communication opposite ends) exist, the mutual interference of which meets the preset condition, and the following conditions are met:
the received signal Strength indication acknowledgement signal ACK RSSI (received signal Strength Indicator) of the user terminal 1 under a certain beam is very large, and the ACK RSSI of the user terminals 2, 3,. and N under the beam is very small;
the ACK RSSI of the ue 2 in a certain beam is very large, and the ACK RSSI of the ues 1, 3,. and N in this beam is very small;
the ACK RSSI of the user terminal N under a certain beam is very large, and the ACK RSSI of the user terminals 1, 2,. and N-1 under this beam is very small;
and the patterns corresponding to the beams of the user terminals 1, 2. E.g., the main lobe of user terminal 1 in the beam pattern overlaps with user terminal 2 in the main lobe of the beam pattern by, e.g., 50%, then the two user terminals are not suitable for forming an SDMA packet.
That is, for the N user terminals, the ACK RSSI of any user terminal in the non-SDMA under a certain beam is greater than the ACKRSSI of the other N-1 user terminals in the non-SDMA under the beam, and the angular overlap portion 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 smaller than a set threshold, for example, smaller than 10 degrees.
The above-described overlapping portion can be judged by the overlapping angle. For example, user 1 has a 3db beamwidth of from 60 degrees to 100 degrees and a width of 40 degrees; the 3db beamwidth of user 2 is from 70 degrees to 90 degrees and the width is 20 degrees, the overlap angle between the two users is 20 degrees.
The condition (2) is to compare whether or not the total rate constituting SDMA communication is larger than the sum of rates corresponding to the optimum beams in non-SDMA communication, and if the total rate is large, it is considered that there is a gain in throughput in SDMA communication.
Specifically, for N user terminals satisfying the condition (1) and whose mutual Interference meets a preset condition, calculating a signal-to-Noise ratio (snr) for each user terminal in non-SDMA and a signal-to-Interference plus Noise ratio (sinr) for each user terminal in SDMA according to ACK RSSI corresponding to different beams for the N user terminals in non-SDMA;
obtaining respective rates r1, r 2.. rN of 1, 2,. N user terminals in SDMA according to the SNR, the SINR and the rate corresponding to the optimal beam;
obtaining a total rate for the N user terminals SDMA according to a total rate r _ SDMA ═ N × min (r1, r2, r3... rN);
and when the total rate r _ SDMA of the N user terminals in SDMA is greater than the rate r1_ max + under the optimal beam of the user terminal 1 + the rate rN _ max under the optimal beam of the user terminal N, the N user terminals are grouped into an SDMA group.
It should be noted that the SDMA packet needs to be determined based on certain antenna array information, which includes: ACKRSSI corresponding to different beams when the user terminal non-SDMA (non-SDMA, a transmitting end adopts a directional transmission mode and only communicates with one user terminal at the same frequency point at the same time), optimal beams when the user terminal non-SDMA and the rate corresponding to the optimal beams. The optimal beam refers to a beam when the user rate is optimal.
Since there is no antenna array history information at first, it is necessary to collect the antenna array information by first communicating the non-SDMA with the user terminal for a certain period of time. In addition, after the antenna array and the control unit are designed, directional pattern information of different switch combinations of the antenna array needs to be obtained through a darkroom test method so as to perform SDMA grouped radio frequency beam forming.
And step 12, controlling the antenna array to form a beam pointing to the space division multiplexing packet user terminal.
The antenna array of the embodiment of the invention consists of a series of directional antenna units with switches, different receiving and transmitting units are respectively provided with a set of antenna switches connected with the antennas of the antenna array, and beams pointing to SDMA grouping user terminals can be formed by controlling the on-off of the antenna switches of the antenna array, thereby achieving the purpose of radio frequency beam forming.
In this case, the beam used for each user terminal in SDMA communication is the beam determined in the above condition (1). Once the beam is determined, the switching of the corresponding antenna switch of the antenna array is determined.
And step 13, directionally transmitting data to the user terminal of the space division multiplexing grouping according to the wave beam.
When the sending end sends SDMA data, other terminals are not expected to compete for the channel, otherwise collision can occur, and normal SDMA communication is affected, so that certain measures need to be adopted to ensure that the channel is occupied by the sending end within a period of time. In the embodiment of the invention, before sending the SDMA data packet, the channel keeps silent in a period of time: firstly, a DTIM (delay transport Indication Message) is sent, wherein the DTIM comprises a broadcast bit, and when the broadcast bit is set to be 1, all terminals wait for a broadcast frame; the CTS-to-self broadcast frame is then sent immediately. The CTS-To-self frame is a special CTS (Clear To Send) frame defined by the wlan standard protocol, i.e. the address of the receiver of the CTS frame is the same as the address of the sender of the CTS frame. A period of time is set in the CTS-to-self frame, and all terminals receiving the frame do not send uplink information in the period of time, so that normal SDMA communication is not affected.
In addition, in SDMA packets, the transmission time (transmission time: packet length/rate) differs among the user terminals due to the difference in packet length and rate, as shown in fig. 2. While the data packet of the ue 2 is still being transmitted, the ue 1 replies to the ACK frame, which causes interference at the transmitting end.
In order to avoid the above situation, the sending end needs to perform padding processing on 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 guaranteed that the data packets are as long. When the data packets are different in length, filling 0 behind the short data packet;
(2) if each user terminal in the SDMA packet uses different rates, it is guaranteed that the transmission time is as long. When the data packet length is not appropriate, 0 is filled in the back of the data packet.
After the filling processing, the sending time of each user terminal data packet can be ensured to be the same, so that the sending end can send data to the SDMA grouped user terminals at the same time, the sending end can communicate with at least 2 user terminals at the same time on the same channel, and the coverage and capacity of a wifi system can be improved on the premise of not increasing additional frequency resources.
It should be noted that, when selecting a user terminal of an SDMA packet based on the collected antenna array information, a plurality of SDMA packets may be obtained, and the transmission order of the plurality of SDMA packets may be determined based on the rate of the SDMA packets and the traffic priority of the SDMA packets. Specifically, there are two ways to determine the transmission order of a plurality of SDMA packets:
one way is to maximize throughput, take into account QoS: determining the transmission order of the SDMA packets according to the rates of the SDMA packets (for example, determining the transmission order of the SDMA packets according to the sequence from high to low of the rates of the SDMA packets), and determining the transmission order of the SDMA packets according to the traffic priorities (for example, from high to low) of the SDMA packets when the rates of the SDMA packets are the same;
another way may be to guarantee QoS with priority, taking throughput into account: determining the transmission order of the SDMA packets according to the traffic priorities (e.g., from high to low) of the SDMA packets, and determining the transmission order of the SDMA packets according to the rates of the SDMA packets when the traffic priorities of the SDMA packets are the same (e.g., determining the transmission order of the SDMA packets in the order of the rates of the SDMA packets from high to low);
wherein the traffic priority of the SDMA packet is determined by the highest traffic priority of the user terminals within the SDMA packet.
In addition, during SDMA communication, it is necessary to perform updates of the SDMA packet, for example, user terminal 1 moves so that it is no longer suitable to compose an SDMA packet with user terminal 2. The basis for judging the update is as follows:
after a certain SDMA packet is communicated for a period of time, acquiring the average packet error rate of the SDMA packet; when the average packet error rate of the SDMA packet is larger than or equal to a set threshold value, for example, 50%, the user terminal of the SDMA packet needs to be modified.
The method for obtaining the average packet Error rate of the SDMA packet is that after each user terminal in the SDMA packet receives a data packet sent by a sending end, an ACK frame is replied to the sending end in a time of a Short InterFrame Space (a time length specified by the SIFS, 802.11 protocol standard), and the sending end can count the packet Error rate per (packet Error rate) of each communication terminal according to the ACK frame.
In summary, the method for implementing SDMA according to the embodiments of the present invention selects a SDMA grouped user terminal through collected antenna array information, controls an antenna array to form a beam pointing to the SDMA grouped user terminal, and then directionally transmits data to the SDMA grouped user terminal according to the beam, so that SDMA grouping and beam forming can be directly performed according to the antenna array information.
Meanwhile, the embodiment of the invention also provides communication equipment which executes the method, and all the steps in the method can be applied to the equipment.
As shown in fig. 3, the apparatus for implementing space division multiplexing according to the embodiment of the present invention includes an antenna array 31, a transceiver unit 35, and
an antenna array information collecting unit 32 for collecting antenna array information;
a user selection unit 33, configured to select a user terminal for space division multiplexing grouping according to the antenna array information;
an antenna array control unit 34 configured to control the antenna array 31 to form a beam directed to the sdm packet user terminal;
a transceiving control unit 36, configured to control the transceiving unit 35 to directionally transmit data to the user terminal of the space division multiplexing packet according to the formed beam.
At least two of the transceiver units 35 are connected to the same antenna array 31 by using different antenna switches. Each transceiver unit can realize the functions of a standard wireless local area network standard protocol PHY (physical layer) and a Media Access Control (MAC); the number of transmitting/receiving units determines the maximum number of SDMA user terminals, which is the upper limit of the number of user terminals in the SDMA packet.
The antenna array information collected by the antenna array information collection unit 32 includes: ACK RSSI corresponding to different beams in non-SDMA of the user terminal, optimal beams in non-SDMA of the user terminal and the rate corresponding to the optimal beams, wherein the optimal beams refer to the beams in optimal user rate.
The user selection unit 33 selects a user terminal of an SDMA packet, and includes:
selecting N user terminals, wherein N is more than or equal to 2 and is less than or equal to the maximum number of communication opposite ends;
acquiring the total rate of the N user terminals in the SDMA process according to the ACK RSSI corresponding to different beams in the N user terminals in the non-SDMA process;
and when the total rate of the N user terminals in the SDMA process is greater than the sum of the rates corresponding to the optimal beams of each user terminal, forming the N user terminals into an SDMA group.
As shown in fig. 3, the antenna array structure is composed of a series of directional antenna units, different transceiver units each have a set of antenna switches connected to antennas of the antenna array, the antenna array control unit 34 forms a desired beam by controlling the on/off of the antenna switches, so as to achieve the purpose of rf beam forming, and different antenna switches are combined to form different beam forms corresponding to different directional patterns.
Further, referring to fig. 4, the apparatus for implementing space division multiplexing according to the embodiment of the present invention may further include:
a packet selecting unit 41, configured to determine, when there are a plurality of selectable spatial division multiplexing packets, a transmission order of the plurality of SDMA packets according to a rate of an SDMA packet and a traffic priority of the SDMA packet.
Specifically, the grouping selection unit may:
further for determining the transmission order of the SDMA packets according to the rates of the SDMA packets (e.g., determining the transmission order of the SDMA packets according to the order of the rates of the SDMA packets from high to low), and determining the transmission order of the SDMA packets according to the traffic priorities (e.g., from high to low) of the SDMA packets when the rates of the SDMA packets are the same; or,
the method can be further used for determining the sending sequence of the SDMA packets according to the service priority (for example, from high to low) of the SDMA packets, and determining the sending sequence of the SDMA packets according to the rate of the SDMA packets when the service priority of the SDMA packets is the same (for example, determining the sending sequence of the SDMA packets according to the sequence of the rate of the SDMA packets from high to low);
wherein the traffic priority of the SDMA packet is determined by the highest traffic priority of the user terminals in the group.
Still further, referring to fig. 4, the apparatus for implementing space division multiplexing according to the embodiment of the present invention may further include:
and the updating unit 42 is used for acquiring the average packet error rate of the SDMA grouping user terminals and modifying the SDMA grouping user terminals when the average packet error rate of the SDMA grouping user terminals is larger than or equal to a set threshold value. The basis for judging the update is as follows:
after a certain SDMA packet is communicated for a period of time, acquiring the average packet error rate of the SDMA packet; and modifying the user terminals of the SDMA packet when the average packet error rate of the SDMA packet is larger than or equal to a set threshold value, for example 50%.
In addition, in the SDMA packet, each user terminal has different transmission time (transmission time: packet length/rate) due to a difference in packet length and rate, and interference occurs at the transmitting end. To avoid this, the transceiving control unit 36 is further preferably configured to perform padding processing on the data packets to be transmitted to make the transmission time of each data packet the same before simultaneously transmitting data to the users in the SDMA packet. There are two possible treatment methods:
one is to guarantee that the packets are as long if each user terminal in the SDMA packet uses the same rate. When the data packets are different in length, filling 0 behind the short data packet;
alternatively, if each user terminal in the SDMA packet uses a different rate, the transmission time is guaranteed to be as long. When the data packet length is not appropriate, 0 is filled in the back of the data packet.
After the padding processing, the sending time of the data packets of each user terminal can be ensured to be the same.
A specific communication flow of the device for implementing space division multiplexing according to the embodiment of the present invention is shown in fig. 5. Because the device can not select SDMA grouping at first when no history information exists, and SDMA communication can not be carried out, non-SDMA communication is needed for a period of time, and the antenna array information collection unit collects the relevant information of the antenna array in the period of time; the grouping selection unit and the user selection unit judge all possible SDMA grouped user terminals according to the antenna array information, and then further select one SDMA group for communication according to a designed criterion; the transmitting and receiving control unit controls the transmitting and receiving unit to transmit a CTS-to-self broadcast frame to reserve a wireless channel; the antenna array control unit controls the antenna array to form a beam pointing to the selected space division multiplexing grouping user terminal according to the collected antenna array information; the receiving and transmitting control unit controls the plurality of receiving and transmitting units to directionally transmit data; the user terminal replies ACK after receiving the data; and the antenna array information collecting unit collects the required antenna array information according to the ACK and continues the SDMA communication of the next round.
The antenna array information collected by the antenna array information collecting unit mainly comprises: the 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 a darkroom test method), the ACK RSSI corresponding to different beams during non-SDMA communication, 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 realizing space division multiplexing of the embodiment of the invention collects the antenna array information when communicating with the user terminal through the antenna array information collecting unit, and the user selection unit selects the user terminal of the space division multiplexing packet according to the antenna array information, the antenna array control unit controls the antenna array to form a beam pointing to the user terminal of the space division multiplexing packet selected by the user selection unit, then the transceiving control unit controls the transceiving unit to directionally transmit data to the user terminal of the space division multiplexing packet according to the formed beam, thereby performing space division multiplexing grouping and beam forming directly according to the antenna array information, compared with the prior art, because the antenna array information is easy to collect, the known channel state information is not needed, the wifi chip suitable for space division multiplexing is not needed to be designed, and the common commercial wifi chip can meet the requirement, so the processing complexity is reduced.
Those skilled in the art will understand that each functional unit in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. All or part of the steps for implementing the method embodiments can be implemented by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps including the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above-described embodiments are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. that may be made by one of ordinary skill in the art without departing from the spirit of the present invention are intended to be included within the scope of the present invention.
Claims (16)
1. A method for implementing space division multiplexing, comprising:
selecting space division multiplexing grouped user terminals according to the collected antenna array information;
controlling an antenna array to form a beam pointing to the space division multiplexing packet user terminal;
according to the wave beam, directionally transmitting data to the user terminal of the space division multiplexing grouping;
wherein the controlling the antenna array to form a beam directed to the sdm packet user terminal comprises:
and forming a beam pointing to the space division multiplexing packet user terminal by controlling the on-off of an antenna switch of the antenna array.
2. The method of claim 1, wherein the collected antenna array information comprises:
the method comprises the steps that the received signal strength indication acknowledgement signals ACKRSSI corresponding to different beams when the user terminal is in non-space division multiplexing, the optimal beam when the user terminal is in non-space division multiplexing and the speed corresponding to the optimal beam, wherein the optimal beam refers to the beam when the user speed is optimal.
3. The method of claim 2, wherein selecting the user terminal for the spatial division multiplexing packet based on the antenna array information comprises:
selecting N user terminals, wherein N is more than or equal to 2 and is less than or equal to the maximum number of communication opposite ends;
acquiring the total rate of the N user terminals during space division multiplexing according to the ACK RSSI corresponding to different beams of the N user terminals during non-space division multiplexing;
and when the total rate of the N user terminals during space division multiplexing is greater than the sum of the rates corresponding to the optimal beams of each user terminal, the N user terminals form space division multiplexing packets.
4. The method of claim 3, wherein the method for selecting N UEs comprises:
for the N user terminals, ACKRSSI of any user terminal in non-space division multiplexing under a certain beam is larger than ACK RSSI of other N-1 user terminals in non-space division multiplexing under the beam, and the angle overlapping part of 3db beam width of the user terminal in a beam pattern and 3db beam width of other N-1 user terminals in the beam pattern is smaller than a set threshold value.
5. The method of claim 3, wherein the obtaining the total rate of the N user terminals in space division multiplexing according to the ACK RSSI corresponding to different beams of the N user terminals in non-space division multiplexing comprises:
according to the ACK RSSI corresponding to different beams when the N user terminals are not space division multiplexed, obtaining the signal-to-noise ratio (SNR) when each user terminal is not space division multiplexed and the signal-to-interference-plus-noise ratio (SINR) when each user terminal is space division multiplexed;
obtaining respective rates of the N user terminals during space division multiplexing according to the SNR, the SINR and the rate corresponding to the optimal beams of the N user terminals;
and obtaining the total rate of the N user terminals during space division multiplexing according to the respective rates of the N user terminals during space division multiplexing.
6. The method of claim 1, further comprising, prior to directionally transmitting data to user terminals of the space division multiplexed packet according to the beam:
and performing filling processing on the data packets to be transmitted so as to enable the transmission time of each data packet to be the same.
7. The method according to any one of claims 1-6, further comprising:
and when the selected space division multiplexing packet is a plurality of packets, determining the transmission sequence of the plurality of space division multiplexing packets according to the rate of the space division multiplexing packet and the service priority of the space division multiplexing packet.
8. The method of claim 7, wherein the determining the transmission order of the plurality of spatial division multiplexing packets according to the rate of the spatial division multiplexing packets and the traffic priority of the spatial division multiplexing packets comprises:
determining the transmission sequence of the space division multiplexing packets according to the rate of the space division multiplexing packets, and determining the transmission sequence of the space division multiplexing packets according to the service priority of the space division multiplexing packets when the rates of the space division multiplexing packets are the same;
or, determining the transmission sequence of the space division multiplexing packets according to the service priority of the space division multiplexing packets, and determining the transmission sequence of the space division multiplexing packets according to the rate of the space division multiplexing packets when the service priorities of the space division multiplexing packets are the same.
9. The method of claim 7, further comprising:
acquiring the average packet error rate of the space division multiplexing grouping user terminal;
and modifying the user terminal of the space division multiplexing grouping when the average packet error rate of the space division multiplexing grouping user terminal is larger than or equal to a set threshold value.
10. An apparatus for implementing space division multiplexing, comprising an antenna array and a transceiver unit, further comprising:
the antenna array information collection unit is used for collecting antenna array information;
a user selection unit, configured to select a space division multiplexing grouped user terminal according to the antenna array information;
an antenna array control unit for controlling the antenna array to form a beam pointing to the space division multiplexing packet user terminal selected by the user selection unit;
a transceiving control unit, configured to control the transceiving unit to directionally transmit data to the user terminal of the space division multiplexing packet according to the formed beam;
the device comprises at least two transceiver units, and each transceiver unit is connected with the same antenna array by adopting different antenna switches.
11. The apparatus of claim 10, wherein the antenna array information collected by the antenna array information collecting unit comprises: the receiving signal strength indication acknowledgement signal ACK RSSI corresponding to different wave beams when the user terminal is not in space division multiplexing, the optimal wave beam when the user terminal is not in space division multiplexing and the speed corresponding to the optimal wave beam, wherein the optimal wave beam refers to the wave beam when the user speed is optimal.
12. The apparatus according to claim 11, wherein the user selection unit selects the user terminal of the space division multiplexing packet includes:
selecting N user terminals, wherein N is more than or equal to 2 and is less than or equal to the maximum number of communication opposite ends;
acquiring the total rate of the N user terminals during space division multiplexing according to the ACK RSSI corresponding to different beams of the N user terminals during non-space division multiplexing;
and when the total rate of the N user terminals during space division multiplexing is greater than the sum of the rates corresponding to the optimal beams of each user terminal, the N user terminals form space division multiplexing packets.
13. The apparatus of claim 12,
the transceiving control unit is further configured to perform padding processing on data packets to be transmitted to make the transmission time of each data packet the same before directionally transmitting data to the user terminal of the space division multiplexing packet according to the formed beam.
14. The apparatus according to any one of claims 10-13, wherein the apparatus further comprises:
and the packet selection unit is used for determining the transmission sequence of the plurality of space division multiplexing packets according to the rate of the space division multiplexing packets and the service priority of the space division multiplexing packets when the selected space division multiplexing packets are a plurality of.
15. The apparatus according to claim 14, wherein the packet selection unit determines the transmission order of the space division multiplexed packets according to the rates of the space division multiplexed packets, and determines the transmission order of the space division multiplexed packets according to the traffic priorities of the space division multiplexed packets when the rates of the space division multiplexed packets are the same; or,
the packet selection unit determines the transmission order of the space division multiplexing packets according to the service priority of the space division multiplexing packets, and determines the transmission order of the space division multiplexing packets according to the rate of the space division multiplexing packets when the service priorities of the space division multiplexing packets are the same.
16. The apparatus of claim 14, further comprising:
and the updating unit is used for acquiring the average packet error rate of the space division multiplexing grouping user terminals and modifying the space division multiplexing grouping user terminals when the average packet error rate of the space division multiplexing grouping user terminals is more than or equal to a set threshold value.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010274369.3A CN102404027B (en) | 2010-09-07 | 2010-09-07 | Method and device for achieving space division multiplexing |
| PCT/CN2011/079346 WO2012031545A1 (en) | 2010-09-07 | 2011-09-05 | Method and device for realizing spatial division multiple access |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010274369.3A CN102404027B (en) | 2010-09-07 | 2010-09-07 | Method and device for achieving space division multiplexing |
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| CN101267235A (en) * | 2007-03-16 | 2008-09-17 | 大唐移动通信设备有限公司 | A method and device for realizing space division multiplexing |
| CN101316130A (en) * | 2007-06-01 | 2008-12-03 | 中国移动通信集团公司 | Shared antenna system and method in closed loop mode |
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| US20040142665A1 (en) * | 2003-01-21 | 2004-07-22 | Apostolos Papathanasion | Method and apparatus for diversity combining using a least squares approach |
| CN100392995C (en) * | 2004-11-17 | 2008-06-04 | 中兴通讯股份有限公司 | A downlink multi-user scheduling method in a multi-transmitting antenna and multi-receiving antenna system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101267235A (en) * | 2007-03-16 | 2008-09-17 | 大唐移动通信设备有限公司 | A method and device for realizing space division multiplexing |
| CN101316130A (en) * | 2007-06-01 | 2008-12-03 | 中国移动通信集团公司 | Shared antenna system and method in closed loop mode |
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