CN110099387B

CN110099387B - Multi-AP information transmission system and transmission method in 6GHz scene

Info

Publication number: CN110099387B
Application number: CN201910368091.7A
Authority: CN
Inventors: 吴伟民; 彭媛媛
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 2019-05-05
Filing date: 2019-05-05
Publication date: 2021-06-29
Anticipated expiration: 2039-05-05
Also published as: CN110099387A

Abstract

The invention belongs to the technical field of network information processing, and discloses a Multi-AP information transmission system and a transmission method under a 6GHz scene, wherein a plurality of APs carry out same-frequency networking, and error information among the APs is acquired through wired interconnection; OBSS pairing is carried out in a 6GHz scene, and same frequency interference in an overlapped basic service set network is suppressed; in a communication system, resources are shared through mutual cooperation between network nodes; combining the Multi-AP and the full-duplex Relay with the same-frequency networking and wired interconnection, using Relay to perform transmission service of uplink proxy, and forwarding a plurality of STA uplink wireless frames of each AP to the corresponding AP in a cross-carrier manner at one time by adopting a convergence manner. The invention further improves the performance of the STA in the OBSS area, improves the overall performance of the system, supports a plurality of frequency bands and supports cross-carrier full duplex.

Description

Multi-AP information transmission system and transmission method in 6GHz scene

Technical Field

The invention belongs to the technical field of network information processing, and particularly relates to a Multi-AP information transmission system and a transmission method in a 6GHz scene.

Background

Currently, the closest prior art:

with the development of multimedia service demand, Wireless local area networks (Wireless LANs) with high mobility, networking flexibility and scalability are favored, and meanwhile, the spectrum of the next-generation WiFi has been expanded to 6 GHz. However, as WLAN deployments become more dense, BSS collisions become more severe, and OBSS becomes more severe, it becomes more important how to achieve effective data transmission in a WLAN scenario with overlapping basic service sets.

The wireless channel has a broadcast characteristic, so that the nodes can help each other, and if the relay is reasonably selected to participate in transmission, the reliability of a communication link can be improved, and the system performance is greatly improved.

The prior art is as follows: research on 3G LTE uplink radio resource management key technology, beijing post and telecommunications university, qian yu.

The article analyzes how to utilize the characteristics of the virtual MIMO channel matrix obtained by user pairing under the condition of virtual MIMO, thereby increasing the system throughput and improving the system performance. In virtual MIMO radio resource management, there are 2 ways for user pairing scheduling: 1) according to a certain scheduling algorithm irrelevant to the virtual MIMO channel, a user is scheduled first, and then the user with the largest channel capacity paired with the user is selected to form the virtual MIMO. To this end, the algorithm proposed herein divides users To be paired into two groups according To the Signal-To-Noise Ratio (SNR), each group has its own corresponding pairing criteria, user pairing is preferentially performed in user groups with similar SNRs, and meanwhile, a cross-group pairing marginal utility function is provided, so as To maximally utilize multi-user diversity.

The system performance is greatly improved by pairing the single-antenna users and transmitting the single-antenna users to the Multi-antenna base station, and under the Multi-AP scene, if the users with negligible mutual interference can be paired and simultaneously communicate with the associated AP, the OBSS collision can be greatly avoided.

Wherein, the fixed relay protocol comprises:

the fixed relay protocol is the simplest cooperative diversity protocol, and the relay nodes participating in cooperation in the network are fixed users.

The selective decode-and-forward relay includes:

if the signal-to-noise ratio of the relay terminal is greater than the set threshold value, the relay has a high probability of correctly decoding, and then the relay decodes the received signal and forwards the decoded signal to the target user. Otherwise, if the channel fading between the source and the relay is severe and the received signal-to-noise ratio is lower than the threshold value, the relay does not participate in the forwarding.

The incremental relaying includes:

if a feedback channel exists between the relay and the destination node, and the destination node can correctly receive and decode the information from the source by using the feedback information of the destination node, an acknowledgement signal is sent to the relay, and the relay does not forward any more. The relay retransmits only if the destination node fails to correctly receive the information from the source node.

In summary, the problems of the prior art are as follows:

(1) the next generation of WiFi extends the spectrum to 6GHz, so all APs operating at 6GHz will support operation in both the 6GHz and 2.4/5.8GHz multi-band. While existing Multi-AP technologies are based on 2.4/5.8GHz scenarios, in OBSS, many existing methods eliminate or reduce interference to an acceptable level, thereby achieving simultaneous transmission, and are not formally supported at 6GHz, which is newly proposed and has not been used in the 6GHz spectrum.

Currently, the Relay technology is mostly realized at a physical level, relatively short of support of some communication mechanisms, and is not applied to 6 GHz.

(2) After each STA receives downlink data sent by the AP, the multiple STAs need to reply BA to the AP independently, the fact that the BA can be correctly received by the AP is difficult to guarantee under the condition of low communication quality, the AP needs to receive and analyze each BA independently, and under the condition of low real-time requirement, the efficiency is low.

The difficulty of solving the technical problems is as follows:

interference exists in the OBSS, the communication quality is seriously influenced, and users with small mutual influence need to be paired in the scheme; retransmission across carriers and aggregation of BA frames.

The significance of solving the technical problems is as follows:

a plurality of APs are subjected to same-frequency networking, the error condition among the APs is known through wired interconnection, OBSS pairing is carried out at 6GHz, the standard of the next generation WiFi is met, the 6GHz frequency band is effectively utilized, and the same-frequency interference in an overlapped basic service set network can be effectively inhibited;

in a communication system, resources are shared through mutual cooperation among network nodes, the coverage range of a wireless network is expanded through relay cooperation, the spectrum efficiency and the communication reliability are improved, and the service quality of a user is improved.

The Multi-AP with the same frequency networking and wired interconnection is combined with the full-duplex Relay, the Relay can perform transmission service of an uplink agent, and forwards a plurality of STA uplink wireless frames of each AP to the corresponding AP in a cross-carrier mode at one time in a convergence mode, so that the reliability is improved, and the transmission efficiency is also improved;

the Relay also provides an ACK enhancement function for the STA in the OBSS, so that the communication quality of the OBSS area is ensured;

the BA of a plurality of STAs is gathered as a load through the gathering frame, and the load is sent to the AP in a cross-carrier mode, so that the feedback overhead is reduced, and the throughput of the system is improved.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a Multi-AP information transmission system and a transmission method in a 6GHz scene.

The invention is realized in this way, and a Multi-AP information transmission method under 6GHz scene comprises the following steps:

a plurality of APs are subjected to same-frequency networking, and error information among the APs is obtained through wired interconnection; OBSS pairing is carried out in a 6GHz scene, the frequency band of 6GHz is effectively utilized, and the same frequency interference in an overlapped basic service set network is inhibited;

in a communication system, resources are shared through mutual cooperation between network nodes;

combining the Multi-AP and the full-duplex Relay with the same-frequency networking and wired interconnection, using Relay to perform transmission service of uplink proxy, and forwarding a plurality of STA uplink wireless frames of each AP to the corresponding AP in a cross-carrier manner at one time by adopting a convergence manner.

Further, Relay is also used to provide ACK enhancement functionality for STAs that are on OBSS.

Further, performing OBSS pairing in a 6GHz scenario includes:

1) the leader AP or the AC controls each AP to independently send downlink data one by one, all the STAs receive the downlink data of all the APs, and the measured signal strengths are converged into an Action frame to be reported to the associated AP;

2) after receiving the Action frames reported by all the associated STAs, the AP converges the related information of all the associated STAs to report the self-defined Ethernet frames to the leader AP or the AC through a wire;

3) the Leader AP or AC collects the AP signal strength near each STA and the wave beam forming condition of each AP, judges which STAs are in a multi-BSS overlapping area and are subjected to downlink interference of which APs, and generates an STA interfered strength registration table;

4) the Leader AP generates a pairing matrix Aij of N x N according to the STA interfered intensity registry; if the Aij value is 1, the Aij value is considered to be matched, and if the Aij value is 0, the Aij value is not matched;

5) STA is not paired with itself, Aii values are all noted as 0.

6) All STAs in the same BSS are considered to be unpaired, and Aij is marked as 0;

7) for the STA only in one BSS, defaulting that the STAs which are different from the associated AP and are not interfered by the AP associated with the STA are all paired, and the Aij value is recorded as 1;

8) for the STA in p BSSs at the same time, all the STAs under the p APs are not paired, and Aii values are recorded as 0; pairing with all the STAs which are not interfered by the p BSSs under the (M-p) APs by default, and recording the Aij value as 1;

9) and for the STA which is in the middle of M BSS at the same time, not pairing, and recording the pairing matrix values Aij of the STA outside the STA in the middle of M BSS as 0.

Further, in step 7), the user starts pairing according to the paired STAs with the median value of 1 in the pairing matrix a, and after the AP sends downlink data, if the paired user i and the paired user j successfully receive the downlink data, an ACK is replied, which also needs to include corresponding timestamp information;

reporting the ACK information received in each time period to a leader AP or an AC by all APs in a wired mode;

in step 8), the leader AP or the AC judges a paired user i and a user j under the AP which performs beam forming simultaneously, if two ACKs with the same timestamp are successfully received at the respective APs, the pairing is considered to be successful, otherwise, the pairing is considered to be failed;

in step 9), the leader AP or AC counts the multiple pairing conditions of i and j, sets a pairing success probability matrix Bij according to the statistics, and when the pairing failure rate is greater than a certain value, if the pairing is not performed, sets Bij to 0, and measures Aij again for the paired users.

Further, the combination of Multi-AP and full duplex Relay includes:

multiple AP6GHz same-frequency networking, through wired interconnection, a Relay is associated with multiple APs at the same time;

when data is sent to the AP by the STA, the STA is associated with the AP firstly, and the AP informs the Relay to carry out uplink proxy transmission service according to the uplink signal quality and RSSI information of the STA in service;

when a plurality of STAs transmit uplink data to the corresponding APs, the STA4, the STA5 and the STA8 have uplink data to transmit to the AP1, and the STA6 and the STA7 have uplink data to transmit to the AP 2; relay simultaneously proxies AP1 and AP2 in different frequency bands.

Further, STA4 successfully accesses the channel first, and STA5 and STA8 detect that the channel is not idle and automatically backoff; STA4 sends data packets to AP1, and Relay also receives data packets sent by STA4 to AP1 and knows that the data packets are sent to AP1 through the destination address; the AP1 replies BA to the STA4 and the Relay according to the received condition;

STA4 and Relay know from the received BA frame which of the data transmitted by STA4 was successfully received by AP1 and which was not successfully received by AP 1.

Further, the STA4 and Relay know, according to the received BA frame, which data sent by the STA4 was successfully received by the AP1 and which data was not successfully received by the AP1, and the receiving conditions of the data frame include:

1) in the data frame sent by STA4 to AP1, AP1 receives successfully; no retransmission operation is needed, and only the AP1 is needed to reply BA to the STA 4;

2) in the data frames sent by the STA4 to the AP1, the data Relay unsuccessfully received by the AP1 is also unsuccessfully received, and only the STA can retransmit the data frames unsuccessfully received by the AP; the AP1 unsuccessfully receives the frame 1, transmits a BA frame to the STA4 according to the reception condition, and the Relay also receives the BA frame, but the Relay itself unsuccessfully receives the frame 1 and can retransmit the frame 1 only by the STA 4;

3) in the data frame sent by STA4 to AP1, the Relay part of the data unsuccessfully received by AP1 is successfully received; adopting STA total retransmission or STA partial retransmission;

4) in the data frame sent by STA4 to AP1, all unsuccessfully received data Relay by AP1 are successfully received; and adopting STA full retransmission or STA partial retransmission.

Further, step 3) adopts a STA total retransmission or a STA partial retransmission, including:

3.1) STA all retransmissions: in a data frame sent by the STA to the AP, the AP cannot successfully receive the STA, but the Relay partially successfully receives the STA, the AP sends a BA to the STA according to the receiving condition, and the Relay also receives the BA; if the STA fails to preempt the channel, the Relay agent sends a data frame which is successfully received by the Relay but not successfully received by the AP before to the AP, and after the STA successfully preempts the channel, the STA retransmits the data frame to the AP according to the BA frame received before;

3.2) STA partial retransmission: the STA sends a data frame to the AP, the AP fails to successfully receive a Relay part in data successfully received by the STA, the AP sends a BA to the STA according to the receiving condition, and the Relay also receives the BA; for data with high real-time requirement, the Relay sends data which is not successfully received by the AP but successfully received by the Relay to the AP, and simultaneously the Relay replies BA' to the STA to indicate that the data which is not successfully received by the AP but successfully received by the Relay is successfully received by the AP, and then the STA only needs to retransmit the data which is not successfully received by the AP and successfully received by the Relay;

for data with low real-time requirement, the Relay replies BA' to the STA to indicate that the data which is not successfully received by the AP before but successfully received by the Relay is successfully received by the AP, and then the STA only needs to retransmit the data which is not successfully received by the AP and successfully received by the Relay before, and then the Relay proxies the STA.

Further, step 4) adopts a STA total retransmission or a STA partial retransmission, including:

4.1) taking data frames with high real-time requirements: in a data frame sent by the STA to the AP, the AP cannot successfully receive the STA, but the Relay partially successfully receives the STA, the AP sends a BA to the STA according to the receiving condition, and the Relay also receives the BA; if the STA fails to preempt the channel, the Relay agent sends a data frame which is successfully received by the Relay but not successfully received by the AP before to the AP, and after the STA successfully preempts the channel, the STA retransmits the data frame to the AP according to the BA frame received before;

4.2) partial retransmission: the STA sends a data frame to the AP, and for all Relay successfully received in the data which cannot be successfully received by the AP, the AP sends BA to the STA according to the receiving condition, and meanwhile, the Relay also receives the BA; for data with high real-time requirement, the Relay firstly sends data which is not successfully received by the AP but successfully received by the Relay to the AP, and meanwhile, the Relay replies BA' to the STA to indicate that the data which is not successfully received by the AP but successfully received by the Relay is successfully received by the AP before, and then the STA does not retransmit the data;

for data with low real-time requirement, the Relay replies BA' to the STA to indicate that the data which is not successfully received by the AP before but successfully received by the Relay is successfully received by the AP, and then the STA does not retransmit the data and is proxied by the Relay.

Another objective of the present invention is to provide a Multi-AP information transmission system in a 6GHz scenario, which implements the Multi-AP information transmission method in the 6GHz scenario.

In summary, the advantages and positive effects of the invention are:

the frequency spectrum of the next generation WiFi is expanded to 6GHz, and in order to improve the frequency spectrum efficiency of broadband wireless communication and the reliability of a link and enable the frequency band of 6GHz to be effectively applied, the invention mainly develops research on multiple APs working at 6GHz in the next generation WiFi from the aspects of wireless resource management and QoS guarantee. In the invention, at 6GHz, multiple APs adopt a mode of same-frequency networking and wired interconnection, and OBSS pairing can be carried out at 6GHz frequency band.

Meanwhile, in order to realize the wider coverage of the network, further improve the performance of the STA in the OBSS area and improve the overall performance of the system, the Multi-AP is combined with the Relay, and the Relay can be simultaneously associated with a plurality of APs to support a plurality of frequency bands and simultaneously support cross-carrier full duplex.

Drawings

Fig. 1 is a flowchart of a method for performing OBSS pairing in a 6GHz scenario according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a Multi-AP information transmission method in a 6GHz scenario according to an embodiment of the present invention.

Fig. 3 is an Action frame format diagram provided in the embodiment of the present invention.

Fig. 4 is a diagram of an ethernet frame format according to an embodiment of the present invention.

Fig. 5 shows that the user starts pairing according to the paired STAs whose median in the pairable matrix a is 1, and after the AP sends downlink data, if the paired user i and the paired user j successfully receive the downlink data, an ACK is replied, and the ACK also includes a corresponding timestamp information map.

Fig. 6 shows that all APs according to the embodiment of the present invention report the ACK information received in each time period to a leader AP or an AC map in a wired manner.

Fig. 7 shows that multiple APs provided by the embodiment of the present invention are 6GHz co-frequency networks, and one Relay can associate with multiple APs simultaneously through wired interconnection.

Fig. 8 is a diagram illustrating a case where a plurality of STAs transmit uplink data to their corresponding APs at 6GHz according to the embodiment of the present invention.

Fig. 9 illustrates an example of uplink proxy service performed by Relay at BSS1 according to the embodiment of the present invention. In the 6GHz band, STA4, STA5, and STA8 all have uplink data to transmit to AP1, and three STAs compete for access to the channel map.

Fig. 10 shows that the AP1 successfully receives the data frame sent by the STA4 to the AP1 according to the embodiment of the present invention.

Fig. 11 is a diagram of a data frame sent by STA4 to AP1, where the data Relay unsuccessfully received by AP1 is also unsuccessfully received, and at this time, only the data frame unsuccessfully received by the AP can be retransmitted by the STA.

Fig. 12 is a diagram of retransmitting a data frame to an AP by an STA according to a BA frame received before.

Fig. 13 is a data diagram with high real-time requirement according to the embodiment of the present invention.

Fig. 14 is a diagram of data provided by an embodiment of the present invention that does not require high real-time performance.

Fig. 15 is a flowchart of a manner adopted by the STA overall retransmission method according to the embodiment of the present invention, where the data frame mainly has a high requirement on real-time performance.

Fig. 16 is a data diagram, in the partial retransmission provided in the embodiment of the present invention, where an STA sends a data frame to an AP, and for all Relay successfully received in data that the AP has failed to receive, the AP sends a BA to the STA according to the receiving condition, and meanwhile, the Relay also receives the BA, which has a high requirement on real-time performance.

Fig. 17 is a data diagram of a partial retransmission process with low real-time requirement according to the embodiment of the present invention.

Fig. 18 is a diagram of a service for performing data cross-carrier retransmission by a Relay agent STA according to the embodiment of the present invention when the real-time requirement of the corresponding data is not high.

Fig. 19 is a diagram of an aggregated data frame provided by an embodiment of the present invention.

Fig. 20 is a diagram provided by an embodiment of the present invention that when an STA is located at the BSS boundary and in an OBSS, the ACK that the STA replies to the AP is not only weak in signal but also very vulnerable to interference from other BSSs, so that the AP cannot correctly receive the ACK.

Fig. 21 is a diagram that a STA replies a BA frame to an AP in a 6GHz band and a Relay associated with the AP receives the BA frame at the same time according to the embodiment of the present invention.

Fig. 22 shows that the STA according to the embodiment of the present invention normally sends a BA to the AP at 6GHz when receiving downlink data, and the Relay also receives the BA frame. STA1, STA2, and STA3, after receiving downlink data of the AP, contend for the access channel to transmit a BA frame to the AP, and automatically backoff the map if the channel is busy.

Fig. 23 is a diagram of a BA aggregate frame according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The next generation of WiFi extends the spectrum to 6GHz, so all APs operating at 6GHz will support operation in both the 6GHz and 2.4/5.8GHz multi-band. While existing Multi-AP technologies are based on 2.4/5.8GHz scenarios, in OBSS, many existing methods eliminate or reduce interference to an acceptable level, thereby achieving simultaneous transmission, and there is no formal support at 6 GHz. Currently, the Relay technology is mostly realized at a physical level, relatively short of support of some communication mechanisms, and is not applied to 6 GHz.

To solve the above problems, the present invention will be described in detail below with reference to the accompanying drawings.

The Multi-AP information transmission method in the 6GHz scene provided by the embodiment of the invention comprises the following steps:

Relay is also used to provide ACK enhancement functionality for STAs that are on OBSS.

As shown in fig. 1, the performing OBSS pairing in a 6GHz scenario provided by the embodiment of the present invention includes:

s101, controlling each AP to independently send downlink data one by a leader AP or an AC, receiving the downlink data of all the APs by all the STAs, converging the measured signal intensity into an Action frame and reporting the Action frame to the associated AP.

S102, after receiving the Action frames reported by all the associated STAs, the AP gathers the related information of all the associated STAs to report the self-defined Ethernet frames to the leader AP or the AC through wires.

S103, the Leader AP or the AC collects AP signal intensity near each STA and the wave beam forming condition of each AP, judges which STAs are in a multi-BSS overlapping area and are subjected to downlink interference of which APs, and generates an STA interference intensity registration table.

S104, generating a pairing matrix Aij of N x N by the Leader AP according to the STA interfered strength registry; if the Aij value is 1, the pair is considered, and if the Aij value is 0, the pair is not matched.

S105, the STA is not paired with the STA, and the Aii values are all recorded as 0.

S106, all the STAs in the same BSS are considered to be unpaired, and Aij is marked as 0.

S107, for the STAs only in one BSS, the STAs which are different from the associated AP and are not interfered by the AP associated with the STAs are all paired by default, and the Aij value is recorded as 1.

S108, for the STA in p BSSs at the same time, all the STAs under the p APs are not paired, and Aii values are all recorded as 0; and pairing with the STAs which are not interfered by the p BSSs under the (M-p) APs by default, and recording the Aij value as 1.

And S109, not pairing the STA which is positioned in the middle of the M BSSs at the same time, and recording the pairing matrix values Aij of the STA outside the STA positioned in the middle of the M BSSs as 0.

The invention is further described with reference to specific examples.

Example one

6GHz OBSS pairing:

1) the leader AP or the AC controls each AP to independently send downlink data one by one, all the STAs receive the downlink data of all the APs, and the measured signal strengths are converged into an Action frame to be reported to the associated AP. Action frame format as in figure 3 and table 1

TABLE 1

2) After receiving the Action frames reported by all the associated STAs, the AP gathers the related information of all the associated STAs to report the self-defined Ethernet frames to the leader AP or the AC through wires.

The ethernet frame format is shown in fig. 4.

3) The Leader AP or AC summarizes the AP (M) signal strengths around each STA (N) and the beamforming of each AP, and determines which STAs are in the multi-BSS overlapping area and are subjected to downlink interference from which APs, thereby generating an STA interference strength registration table 2.

TABLE 2

4) And the Leader AP generates an N-by-N pairable matrix Aij according to the STA interfered strength registry. If the Aij value is 1, pairing is considered, and if the Aij value is 0, pairing is not possible.

5) STA is not paired with itself, so Aii values are all recorded as 0.

6) All STAs in the same BSS, considered unpaired, all Aij are marked as 0.

7. For the STAs in only one BSS (the interference intensity by other (M-1) APs is less than the threshold T), the default STA which is different from the associated AP and is not interfered by the STA associated AP may be paired, and the Aij value is recorded as 1.

And the user starts to pair according to the paired STA with the median value of 1 in the pairable matrix A, and after the AP sends downlink data, if the paired user i and the paired user j successfully receive the downlink data, an ACK is replied, wherein the ACK also needs to contain corresponding timestamp information. As shown in fig. 5.

And reporting the ACK information received in each time period to the leader AP or the AC by all the APs in a wired mode. As shown in fig. 6.

8) For the STA in p BSSs at the same time, all STAs under the p APs cannot be paired, and the Aii value is recorded as 0. The default is that the STA which is not interfered by the p BSSs under other (M-p) APs can be paired, and the Aij value is recorded as 1.

And judging a paired user i and a paired user j under the AP which performs beam forming simultaneously by the leader AP or the AC, and if the paired users respectively successfully receive two ACKs with the same time stamp from the respective APs, considering that the paired users are successfully paired, otherwise, considering that the pairing is failed.

9) For the STA in the middle of M BSSs, no pairing is performed, and the pairable matrix values Aij of all other STAs are all marked as 0.

And counting the multiple pairing conditions of i and j by the leader AP or the AC, setting a pairing success probability matrix Bij according to the statistics, when the pairing failure rate is greater than a certain value, determining that pairing is impossible, setting Bij to be 0, and for an unpaired user, measuring Aij again.

Example two

Combination of Multi-AP with full-duplex Relay:

in the scheme, the Multi-AP and the Relay are combined, the Relay supports a plurality of carriers and has the capacity of cross-carrier full duplex. The multiple APs are 6GHz co-frequency networking, and one Relay can be associated with multiple APs simultaneously through wired interconnection, as shown in fig. 7.

And 6GHz, when the STA has data to send to the AP, associating the STA with the AP, and informing the Relay of being capable of carrying out the uplink proxy transmission service according to the uplink signal quality and RSSI information of the service STA by the AP.

At 6GHz, when a plurality of STAs transmit uplink data to their respective corresponding APs, as shown in fig. 8, STA4, STA5, and STA8 have uplink data to transmit to AP1, and STA6 and STA7 have uplink data to transmit to AP 2. Relay may proxy AP1 and AP2 simultaneously in different frequency bands.

Take the example of Relay performing upstream proxy service at BSS 1. In the 6GHz band, STA4, STA5, and STA8 all have uplink data to transmit to AP1, and three STAs compete for access channels. As shown in fig. 9.

Assuming STA4 successfully accesses the channel first, it detects that the channel is not idle and automatically backs off for STA5 and STA 8. STA4 sends a packet to AP1 while Relay also receives the packet and knows that the packet is for AP1 by the destination address. The AP1 replies with BAs for STA4 and Relay, depending on the situation received. The STA4 and the Relay know which data transmitted by the STA4 are successfully received by the AP1 and which data are not successfully received by the AP1 according to the received BA frame, and can be classified into four categories according to the data receiving conditions of the AP and the Relay.

In the embodiment of the present invention, the receiving conditions of the data frame can be roughly classified into four types. The method comprises the following steps:

1) in the data frame sent by STA4 to AP1, AP1 receives successfully. As shown in fig. 10, no retransmission operation is required, and only the AP1 is required to reply with a BA to the STA 4;

2) in the data frame sent by STA4 to AP1, the data Relay unsuccessfully received by AP1 is also unsuccessfully received, and at this time, the data frame unsuccessfully received by the AP can only be retransmitted by the STA. As shown in fig. 11, the AP1 does not successfully receive frame 1, transmits a BA frame to the STA4 according to the reception condition, and receives the BA frame by Relay, and since Relay itself does not successfully receive frame 1, it is only possible to retransmit frame 1 by the STA 4;

3) in the data frame sent by STA4 to AP1, the Relay portion of the data unsuccessfully received by AP1 is successfully received. In turn, STA full retransmission or STA partial retransmission may be employed for such cases.

3.1) STA all retransmissions: this is mainly the way data frames with high real-time requirements are taken, and Relay is transparent to STAs. In the data frame sent by the STA to the AP, the AP cannot successfully receive the data frame, but the Relay successfully receives part of the data frame, and the AP sends a BA to the STA according to the receiving condition and simultaneously receives the BA by the Relay. If the STA fails to preempt the channel at this time, the Relay agent may first send a data frame that the Relay successfully receives but the AP did not successfully receive before to the AP, and after the STA successfully preempts the channel, the STA retransmits the data frame to the AP according to the BA frame that is received before, as shown in fig. 12:

3.2) STA partial retransmission: the STA sends a data frame to the AP, the AP cannot successfully receive the Relay part in the data successfully received by the AP, the AP sends BA to the STA according to the receiving condition, and the Relay also receives the BA. Fig. 13 shows data requiring high real-time performance. The Relay may send, to the AP, data that the AP did not successfully receive but the Relay successfully received, and at the same time, the Relay replies a BA' to the STA, indicating that the previous data that the AP did not successfully receive but the Relay successfully received is now successfully received by the AP, and then the STA only needs to retransmit the data that was not successfully received by the AP and was not successfully received by the Relay.

In the embodiment of the present invention, data with low real-time requirement is shown in fig. 14. The Relay can reply BA' to the STA, the data which is not successfully received by the AP before but is successfully received by the Relay is indicated to be successfully received by the AP, and then the STA only needs to retransmit the data which is not successfully received by the AP before and successfully received by the Relay, and the Relay proxies the STA;

4) in the data frame sent by STA4 to AP1, all the unsuccessfully received data Relay by AP1 are successfully received. In turn, STA full retransmission or STA partial retransmission may be employed for such cases.

4.1) all retransmission of STAs is mainly a manner adopted by data frames with relatively high real-time requirements, and in such cases, all retransmission schemes of STAs "in the data frame sent by STA4 to AP1, the Relay part of data unsuccessfully received by AP1 is successfully received" are the same, and the flow is shown in fig. 15.

4.2) partial retransmission: the STA sends a data frame to the AP, and for all Relay successfully received in the data which cannot be successfully received by the AP, the AP sends BA to the STA according to the receiving condition, and meanwhile, the Relay also receives the BA. Fig. 16 shows data with high real-time requirements.

The data that the AP did not successfully receive but the Relay successfully received may be sent to the AP by the Relay first, while the Relay replies the BA' to the STA, indicating that the data that the AP did not successfully receive but the Relay successfully received was now successfully received by the AP, and then the STA does not retransmit any more.

In the embodiment of the present invention, data with low real-time requirement is shown in fig. 17.

The BA' may be replied to the STA by the Relay first, indicating that the data that was not successfully received by the AP before but was successfully received by the Relay is now successfully received by the AP, and then the STA does not retransmit, and is subsequently proxied by the Relay.

Fig. 18 shows that the Relay agent STA performs the data cross-carrier retransmission service in response to the case c3 where the real-time requirement of data is not high.

For all failed transmissions by STA4 to AP1, Relay receives correctly, then the BA is replied by Relay to STA4, STA4 does not retransmit and is buffered by Relay. Then STA5 and STA8 compete for access channel, similarly, if the Relay data sent by STA5 or STA8 to AP1 are correctly received and buffered, STA5 or STA8 does not retransmit any more, and finally the Relay retransmits the data which is sent by three STAs to AP1 at one time but is in error, across carriers, and the data can be sent to AP1 at 2.4GHz by convergence once. The same is true of Relay acting on the proxy service of BSS 2.

In the embodiment of the present invention, the aggregate data frame is as shown in fig. 19.

When the error data is gathered, the frame gathering mode is the same as the traditional method, as shown in the above figure. In order to distinguish the data aggregation frame which is forwarded in error in the scheme from the traditional aggregation frame, the scheme sets a reserved field in each separator of the aggregation frame to be 1 as a mark.

Relay provides ACK enhanced transmission function for STAs with multiple AP service boundary overlapping areas:

when the STA is located at the BSS boundary and in the OBSS, the ACK replied by the STA to the AP is not only weak in signal, but also very susceptible to interference from other BSSs, so that the AP cannot correctly receive the ACK. As shown in fig. 20.

STA5 belongs to OBSS of BSS1, BSS2 and BSS3, when STA5 is about to send ACK to AP2, Relay will also receive the ACK at the same time, learn through the physical address in ACK that is sent to AP2, Relay amplifies the ACK signal and forwards to AP2, AP2 receives jointly through ACK replied to STA5 and Relay, has improved OBSS district user's performance.

Relay negotiates with AP to provide BA proxy transmission function for some STAs with higher BA loss rate:

in the 6GHz band, the STA replies a BA frame to the AP, and the Relay associated with the AP also receives the BA frame, as shown in fig. 21.

If the rate of BA frame loss from STA4 to AP1 is relatively high, overall network communication inefficiencies may result if the transmission of BAs by STA4 to AP1 continues. If Relay successfully receives the BA frame, Relay provides a BA proxy transmission function of cross-carrier for STA4, and sends BA to AP1 at 2.4GHz until AP1 successfully receives the BA, further improving reliability of the link.

The Relay may converge the BAs of the plurality of STAs as loads and send the converged BAs to the AP through the common-frequency or different-frequency channel through the convergence frame:

when receiving downlink data, the STA normally sends BA to the AP at 6GHz, and simultaneously, the Relay also receives the BA frame. STA1, STA2, and STA3, after receiving downlink data of the AP, contend for the access channel to send a BA frame to the AP, and automatically back off if the channel is busy. As shown in fig. 22.

The STA1 sends BA1 to the AP, the Relay correctly receives BA1, the STA2 sends BA2 to the AP, the AP does not correctly receive BA2, but the Relay correctly receives BA2, the AP does not correctly receive BA3, the Relay correctly receives BA3, the Relay sends BA1, BA2 and BA3 to the AP in a cross-carrier mode at 2.4GHz at one time, and the AP carries out downlink retransmission processing according to the received Relay and the BA sent by each STA, thereby not only ensuring the reliability of a communication link, but also reducing the feedback overhead.

In the embodiment of the present invention, the BA aggregate frame is shown in fig. 23.

When the BA frame is aggregated, the BA frame is simply used as an MPDU in aggregation as in the aggregation of data frames. Similarly, in order to distinguish BA frame aggregation from other aggregation, the present solution sets a reserved field in each delimiter of an aggregation frame to 0 as a flag.

The present invention will be further described with reference to effects.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A Multi-AP information transmission method in a 6GHz scene is characterized by comprising the following steps:

a plurality of APs are subjected to same-frequency networking, and error information among the APs is obtained through wired interconnection; OBSS pairing is carried out in a 6GHz scene, the frequency band of 6GHz is effectively utilized, co-frequency interference in an overlapped basic service set network is inhibited, and only users successfully paired with OBSS can simultaneously communicate with the associated AP;

combining common-frequency networking, wired interconnected Multi-AP and full-duplex Relay, utilizing Relay to perform transmission service of uplink agent, and forwarding a plurality of STA uplink wireless frames of each AP to corresponding AP in a cross-carrier manner by Relay in a convergence manner;

the OBSS pairing in the 6GHz scene comprises the following steps:

3) the Leader AP or AC collects the AP signal intensity of each STA and the wave beam forming condition of each AP, judges whether the STA is in a multi-BSS overlapping area and is interfered by the downlink of the AP or not, and generates an STA interfered intensity registration table;

4) the Leader AP generates a pairing matrix A of N x N according to the STA interfered intensity registry; if the Aij value is 1, the Aij value is considered to be matched, and if the Aij value is 0, the Aij value is not matched; n is the number of STA;

5) STA is not paired with self, and Aii values are all recorded as 0;

8) for the STA in p BSSs at the same time, all the STAs under the p APs are not paired, and the Aij values are all marked as 0; pairing with all the STAs which are not interfered by the p BSSs under the (M-p) APs by default, and recording the Aij value as 1;

2. The Multi-AP information transmission method in a 6GHz scenario according to claim 1, wherein Relay is further configured to provide ACK enhanced services for STAs that are in OBSS; the plurality of APs share resources through mutual cooperation among the network nodes.

3. The Multi-AP information transmission method in the 6GHz scene according to claim 1, characterized in that, in step 7), the user pairs according to paired STAs with a median of 1 in the pairing matrix A, the AP associated with the paired STAs sends downlink data, and after successful reception of the paired user i and the paired user j, an ACK is replied, and the ACK includes corresponding timestamp information;

in step 8), the leader AP or the AC judges a paired user i and a paired user j under the beam-formed AP, if two ACKs with the same timestamp are successfully received at the respective APs, the pairing is considered to be successful, otherwise, the pairing is considered to be failed;

in step 9), the leader AP or AC counts the multiple pairing conditions of the paired user i and the paired user j, sets the pairing success probability matrix Bij, when the pairing failure rate is greater than a certain value, it is determined that the paired users are not paired, sets Bij to 0, and measures Aij again for the paired users.

4. The Multi-AP information transmission method in a 6GHz scenario according to claim 1, wherein the combining of the Multi-AP and the full-duplex Relay comprises:

5. The Multi-AP information transmission method in 6GHz scene according to claim 4, characterized in that STA4 successfully accesses the channel first, STA5 and STA8 detect that the channel is not idle, and automatically backoff; STA4 sends data packets to AP1, and Relay also receives data packets sent by STA4 to AP1 and knows that the data packets are sent to AP1 through the destination address; the AP1 replies BA to the STA4 and the Relay according to the received condition;

6. The Multi-AP information transmission method in 6GHz scenario according to claim 5, wherein the STA4 and Relay know which data sent by STA4 was successfully received by AP1 and which data was not successfully received by AP1 according to the received BA frame, and the receiving status of the data frame comprises:

7. The Multi-AP information transmission method in a 6GHz scenario according to claim 6, wherein the step 3) of using a STA full retransmission or a STA partial retransmission comprises:

a) all retransmission by the STA: in a data frame sent by the STA to the AP, the AP cannot successfully receive the STA, but the Relay partially successfully receives the STA, the AP sends a BA to the STA according to the receiving condition, and the Relay also receives the BA; if the STA fails to preempt the channel, the Relay agent sends a data frame which is successfully received by the Relay but not successfully received by the AP to the AP, and after the STA successfully preempts the channel, the STA retransmits the data frame to the AP according to the received BA frame;

b) STA partial retransmission: the STA sends a data frame to the AP, the AP fails to successfully receive a Relay part in data successfully received by the STA, the AP sends a BA to the STA according to the receiving condition, and the Relay also receives the BA; for data with high real-time requirement, the Relay firstly sends data which is not successfully received by the AP but successfully received by the Relay to the AP, and meanwhile, the Relay replies BA' to the STA, indicating that the STA only needs to retransmit the data which is not successfully received by the AP and not successfully received by the Relay after the data which is not successfully received by the AP but successfully received by the Relay is successfully received by the AP;

for data with low real-time requirement, the Relay replies BA' to the STA to indicate that the previous data which is not successfully received by the AP but successfully received by the Relay is currently successfully received by the AP, and the STA only needs to retransmit the data which is not successfully received by the AP and successfully received by the Relay, and then the Relay proxies the STA.

8. The Multi-AP information transmission method in a 6GHz scenario according to claim 6, wherein the step 4) of using a STA full retransmission or a STA partial retransmission comprises:

i) the data frame with high real-time requirement is as follows: in a data frame sent by the STA to the AP, the AP cannot successfully receive the STA, but the Relay partially successfully receives the STA, the AP sends a BA to the STA according to the receiving condition, and the Relay also receives the BA; if the STA fails to seize the channel, the Relay agent sends a data frame which is successfully received by the AP and is not successfully received by the AP to the AP, and after the STA successfully seizes the channel, the STA retransmits the data frame to the AP according to the received BA frame;

ii) partial retransmission: the STA sends a data frame to the AP, and for all Relay successfully received in the data which cannot be successfully received by the AP, the AP sends BA to the STA according to the receiving condition, and meanwhile, the Relay also receives the BA; for data with high real-time requirement, the Relay firstly sends data which is not successfully received by the AP but successfully received by the Relay to the AP, and meanwhile, the Relay replies BA' to the STA to indicate that the STA does not retransmit the data which is not successfully received by the AP but successfully received by the Relay is successfully received by the AP;

for data with low real-time requirement, the Relay replies BA' to the STA first, indicating that the AP does not successfully receive the data, but the data successfully received by the Relay is successfully received by the AP, and then the STA does not retransmit the data, and the Relay proxies the data.

9. A Multi-AP information transmission system in a 6GHz scene for implementing the Multi-AP information transmission method in the 6GHz scene of claim 1.