CN107645786B

CN107645786B - Method, equipment and system for multi-user parallel transmission

Info

Publication number: CN107645786B
Application number: CN201610575855.6A
Authority: CN
Inventors: 李楠; 吕开颖; 孙波; 韩志强
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-07-20
Filing date: 2016-07-20
Publication date: 2022-07-08
Anticipated expiration: 2036-07-20
Also published as: CN107645786A

Abstract

The embodiment of the invention discloses a method, equipment and a system for multi-user parallel transmission; the method can comprise the following steps: a site sends a wireless frame to an opposite end, and acquires transmission time according to the process of sending the wireless frame; the station determines the maximum length of the transmission time according to a preset determination strategy; and the station exchanges frames with the opposite terminal before the maximum length of the transmission time is reached.

Description

Method, equipment and system for multi-user parallel transmission

Technical Field

The present invention relates to wireless communication technologies, and in particular, to a method, device, and system for multi-user parallel transmission.

Background

With the development of Wireless Local Area Network (WLAN) technology and the increasing number of WLAN users, the efficiency of WLAN network is obviously reduced in dense network scenes, and the problem of efficiency reduction cannot be solved by simply increasing the network transmission rate, so that the multi-user parallel transmission technology becomes a technology for improving the network efficiency, and has attracted extensive attention and research.

In the prior art multiuser parallel transmission technology, a Basic Service Set (BSS) of a WLAN includes an Access Point (AP) and a plurality of non-Access stations (non-AP stations) associated with the Access Point. In a WLAN, multiple non-access point stations send data to an access point at the same time, which is called uplink Multi-User (UL MU) transmission, where a User is equivalent to a station; the AP sends data to multiple non-AP STAs simultaneously, called downlink Multi-User (DL MU) transmission.

Currently, most WLAN systems with Quality of Service (QoS) transmit data in a contention mode, that is, an enhanced Distributed Channel access (edca) mode.

Specifically, the EDCA defines four Access Category (AC) queues, which may specifically include AC _ bk (background), AC _ be (best effort), AC _ vo (voice), and AC _ vi (video), where each AC has a set of contention parameters, and the contention parameters include inter-frame Space (AIFS), maximum duration (TXOP Limit) of Transmission Opportunity (TXOP), maximum cwmax (contention window) and minimum CWmin of contention window. Wherein a transmission opportunity (TXOP) is defined by a start time and a maximum duration to characterize a period of time during which a QoS station can initiate one or more frame exchange sequences to a wireless medium. Different ACs express respective priorities by competing parameter values.

When the upper layer data packet arrives, the data packet enters one of the four AC queues according to the priority attribute of the data packet to be queued for transmission. When the AC queue has data to transmit, the edcaf (edca function) of the AC queue starts a channel contention process using the contention parameter of the AC. When a wireless frame is sent out and an acknowledgement frame (a frame exchange sequence of a response frame is needed) is received, or the wireless frame is sent out (a frame exchange sequence of a response frame is not needed), the station acquires a transmission opportunity by the AC, and the longest channel transmission time that the station can occupy does not exceed the length limited by the TXOP Limit of the AC.

In the multi-user transmission process, uplink multiple users send trigger information to trigger through an AP, where the trigger information is generally carried in a trigger frame, or in a signaling domain of a physical layer or an MAC layer in the frame, and is referred to as the trigger frame in this specification. The uplink multi-user transmission process is generally as follows: the AP sends a trigger frame to a plurality of sites, wherein the trigger frame carries uplink multi-user transmission parameters, and the trigger frame comprises the following steps: the identification information of the station, the time and frequency resource information used by the station for uplink transmission, the length of the data packet for uplink transmission of the station, the modulation and coding mode of the station, and the like. And the station receives the trigger frame, if the identification information of the station is carried in the trigger frame, the station indicates that the station is scheduled in the UL MU transmission, and if the station has data to be sent, the station carries out uplink multi-user transmission according to the parameters indicated by the AP after a fixed time interval (SIFS, Short Interframe Space). In addition, the AP may also send a trigger frame alone to trigger uplink multi-user transmission, or the AP may aggregate the trigger frame and the downlink MU Data packet in one Aggregated MAC layer Data Unit (a-MPDU), or send the trigger frame as a part of Data of the DL MU.

It can be understood that, since the trigger frame may be sent using any contention parameter, and the transmission triggered by using the trigger frame involves multiple users, according to the existing transmission opportunity, the station cannot determine the maximum time length that can occupy the channel in this case, so that fairness in terms of using the channel between stations cannot be ensured.

Disclosure of Invention

To solve the foregoing technical problems, embodiments of the present invention are directed to a method, device, and system for multi-user parallel transmission; the maximum time length of the transmission opportunity can be reasonably set in the uplink multi-user data transmission process, and the fairness of the user in the channel occupying time is effectively ensured.

The technical scheme of the invention is realized as follows:

in a first aspect, an embodiment of the present invention provides a method for multi-user parallel transmission, where the method includes:

a station sends a wireless frame to an opposite terminal and acquires transmission time according to the process of sending the wireless frame; the transmission time refers to the length of a time period for the station to perform frame exchange with the opposite terminal at a first inter-frame interval and/or a second inter-frame interval;

the station determines the maximum length of the transmission time according to a preset determination strategy;

and the station exchanges frames with the opposite terminal before the maximum length of the transmission time is reached.

In the above scheme, the first interframe space comprises a short interframe space SIFS; the second inter-frame space comprises a point coordination function inter-frame space (PIFS).

In the foregoing solution, the acquiring, by the station, the transmission time according to the process of sending the radio frame specifically includes:

and the site receives a response frame corresponding to the wireless frame or a part of the response frame and acquires the transmission time.

and the station acquires the transmission time at the moment of sending the wireless frame.

the station acquires the transmission time through an access category competition channel of the station; alternatively, the first and second liquid crystal display panels may be,

and the station acquires the transmission time by adopting a second interframe space competition channel.

In the foregoing scheme, the acquiring, by the station, the transmission time by using a second interframe space contention channel specifically includes:

and when the station detects that the idle time length of the channel is greater than or equal to the second interframe space, immediately sending the wireless frame and acquiring the transmission time.

In the above scheme, the radio frame is used to trigger the opposite end to perform data transmission with the station; the wireless frame includes: trigger frame, downlink multi-user frame, downlink single-user frame, channel reservation request frame, and channel measurement notification frame.

In the above solution, the frame exchange includes any combination of the following:

the system comprises a trigger frame and an uplink multi-user frame, a downlink multi-user frame and an uplink multi-user frame, a downlink single-user frame and an uplink multi-user frame, a channel reservation request frame and a channel reservation corresponding frame, a channel measurement notification frame and a channel measurement frame, a trigger frame and a feedback frame.

In the above scheme, the determining, by the station, the maximum length of the transmission time according to a preset determination policy specifically includes:

the station acquires transmission time when adopting a second inter-frame interval competition channel; wherein, the trigger frame sent during the channel competition indicates the access category of the data sent by all opposite terminals;

and the station takes at least one of the maximum length of the transmission opportunity corresponding to the access category or the maximum length of the transmission time predefined by the system as the maximum length of the transmission time.

In the foregoing solution, the determining, by the station, the maximum length of the transmission time according to the transmission time obtained in the process of sending the radio frame and a preset determination policy specifically includes:

the station acquires transmission time when a second inter-frame interval competition channel is adopted, wherein a trigger frame sent during the competition channel indicates the corresponding access category of each opposite terminal when sending data;

the station determines the maximum length of the transmission opportunities corresponding to the access category or the maximum length of the transmission opportunities corresponding to the access category with the highest priority; or at least one of the maximum transmission opportunity length corresponding to the access category of the primary user in the opposite terminal or the maximum length of the transmission time predefined by the system is used as the maximum length of the transmission time.

the station acquires transmission time when adopting a second inter-frame interval competition channel;

and when the access category is not carried in the trigger frame sent during the channel competition, the station takes the maximum length of the transmission time predefined by the system as the maximum length of the transmission time.

the station acquires the transmission time by accessing a category competition channel; the station indicates the access categories of all opposite terminals when sending data in a trigger frame sent when competing for the channel through the access categories;

the station obtains the maximum transmission opportunity length of the access category of the channel; or a maximum length of transmission opportunities for an access category indicated in the trigger frame; or a maximum value between the maximum transmission opportunity length of the access category of the acquisition channel and the maximum transmission opportunity length of the access category indicated in the trigger frame; or at least one of a maximum length of transmission time predefined by the system as the maximum length of transmission time.

the station acquires the transmission time through an access category competition channel, wherein the trigger frame sent by the station through the access category competition channel indicates the access category of data sent by each opposite terminal;

the station obtains the maximum length of the transmission opportunity of the access category of the channel or the maximum value of the maximum length of the transmission opportunity corresponding to the access category indicated in the trigger frame; or the maximum length of the transmission opportunity corresponding to the access category with the highest priority in the access categories indicated in the trigger frame; or a maximum length of transmission time predefined by the system as the maximum length of transmission time.

In the above solution, the maximum length of the transmission time predefined by the system at least includes the following:

maximum length of transmission opportunity corresponding to access category with highest priority in current system, maximum value in maximum length of transmission opportunity of all access categories in current system, maximum length of transmission time defined by current system for triggering transmission, and maximum length of transmission time having mapping relation with system parameter; wherein the system parameter comprises at least one of: the number of associated stations in the system, the number of stations only supporting contention access in the system, the number of stations supporting trigger transmission in the system, the number of stations to be triggered in the current transmission time, the size of a sending buffer and/or a receiving buffer of a station, and the size of a sending buffer and/or a receiving buffer of an opposite terminal.

In the above scheme, when the transmission time is within the allocated transmission period, the maximum length of the transmission time does not exceed the time period length of the allocated transmission period; wherein the transmission period comprises a service period or a limited contention window.

In the above scheme, when the transmission time is acquired outside the transmission period, the transmission time is limited by a first time length;

when the transmission time is obtained within the transmission period, the transmission time is limited by a second time length; the second length of time does not exceed a length of time for the transmission period.

In a second aspect, an embodiment of the present invention provides a station, where the station includes: the system comprises a sending module, an obtaining module, a determining module and an interaction module; wherein the content of the first and second substances,

the sending module is used for sending the wireless frame to the opposite terminal;

the acquisition module is used for acquiring transmission time according to the process of sending the wireless frame; the transmission time refers to the length of a time period for the station to perform frame exchange with the opposite terminal at a first inter-frame interval and/or a second inter-frame interval;

the determining module is used for determining the maximum length of the transmission time according to a preset determining strategy;

and the interaction module is used for carrying out frame exchange with the opposite terminal before the maximum length of the transmission time is reached.

In the above scheme, the first interframe space includes a short interframe space SIFS; the second inter-frame space comprises a point coordination function inter-frame space, PIFS.

In the foregoing scheme, the obtaining module is specifically configured to:

and receiving a response frame corresponding to the wireless frame or a part of the response frame, and acquiring the transmission time.

In the foregoing scheme, the obtaining module is specifically configured to:

and acquiring the transmission time at the moment when the sending module sends the wireless frame.

In the foregoing scheme, the obtaining module is specifically configured to:

acquiring the transmission time through an access category competition channel of the terminal; alternatively, the first and second electrodes may be,

and acquiring the transmission time by adopting a second interframe space competition channel.

In the foregoing solution, the obtaining module is specifically configured to:

and when the idle time length of the detection channel is greater than or equal to the second inter-frame interval, immediately triggering the sending module to send the wireless frame and acquiring the transmission time.

In the above scheme, the radio frame is used to trigger the opposite end to perform data transmission with the station; the wireless frame includes: trigger frame, downlink multi-user frame, downlink single-user frame, channel reservation request frame and channel measurement notification frame.

trigger frame and uplink multi-user frame, downlink multi-user frame and uplink multi-user frame, downlink single-user frame and uplink multi-user frame, channel reservation request frame and channel reservation corresponding frame, channel measurement notification frame and channel measurement frame, trigger frame and feedback frame.

In the foregoing solution, the determining module is specifically configured to:

acquiring transmission time when a second inter-frame interval competition channel is adopted; wherein, the trigger frame sent during the channel competition indicates the access category of the data sent by all opposite terminals; and the number of the first and second groups,

and taking at least one of the maximum length of the transmission opportunity corresponding to the access category or the maximum length of the transmission time predefined by the system as the maximum length of the transmission time.

acquiring transmission time when a second inter-frame interval competition channel is adopted, wherein a trigger frame sent in the competition channel indicates each opposite terminal to indicate a corresponding access category when data is sent; and the number of the first and second groups,

the maximum value of the maximum transmission opportunity lengths corresponding to the access categories or the maximum transmission opportunity length corresponding to the access category with the highest priority in the access categories is obtained; or at least one of the maximum transmission opportunity length corresponding to the access category of the primary user in the opposite terminal or the maximum length of the transmission time predefined by the system is used as the maximum length of the transmission time.

acquiring transmission time when a second inter-frame interval competition channel is adopted; and (c) a second step of,

and when the access category is not carried in the trigger frame sent during the channel competition, taking the maximum length of the transmission time predefined by the system as the maximum length of the transmission time.

acquiring the transmission time by accessing a category competition channel; the station indicates the access categories of all opposite terminals when sending data in a trigger frame sent when competing for the channel through the access categories; and the number of the first and second groups,

maximum length of transmission opportunity of access category of the obtained channel; or a maximum length of transmission opportunities for an access category indicated in the trigger frame; or a maximum value between the maximum transmission opportunity length of the access category of the acquisition channel and the maximum transmission opportunity length of the access category indicated in the trigger frame; or at least one of a maximum length of transmission time predefined by the system as the maximum length of transmission time.

acquiring the transmission time through an access category contention channel, wherein the access category of data transmitted by each opposite terminal is indicated in a trigger frame transmitted by the station when the station passes through the access category contention channel; and the number of the first and second groups,

obtaining the maximum transmission opportunity length of the access category of the channel or the maximum transmission opportunity length corresponding to the access category indicated in the trigger frame; or the maximum length of the transmission opportunity corresponding to the access category with the highest priority in the access categories indicated in the trigger frame; or a maximum length of transmission time predefined by the system as the maximum length of transmission time.

In the above solution, the maximum length of the transmission time predefined by the system at least includes the following item:

maximum length of transmission opportunity corresponding to access category with highest priority in the current system, maximum value in maximum length of transmission opportunity of all access categories in the current system, maximum length of transmission time defined by the current system for triggering transmission, and maximum length of transmission time having mapping relation with system parameters; wherein the system parameter comprises at least one of: the number of associated stations in the system, the number of stations only supporting contention access in the system, the number of stations supporting trigger transmission in the system, the number of stations to be triggered in the current transmission time, the size of a sending buffer and/or a receiving buffer of a station, and the size of a sending buffer and/or a receiving buffer of an opposite terminal.

In a third aspect, an embodiment of the present invention provides a system for multi-user parallel transmission, where the system includes a site and an opposite end corresponding to the site; wherein the content of the first and second substances,

the station is used for sending a wireless frame to the opposite terminal and acquiring transmission time according to the process of sending the wireless frame; the transmission time refers to the length of a time period for the station to perform frame exchange with the opposite terminal at a first inter-frame interval and/or a second inter-frame interval;

determining the maximum length of the transmission time according to a preset determination strategy;

and exchanging frames with the opposite terminal before the maximum length of the transmission time is reached.

The embodiment of the invention provides a method, equipment and a system for multi-user parallel transmission; the maximum transmission time length is determined by the station, the maximum transmission opportunity time length can be reasonably set in the multi-user data transmission process, and the fairness of the user in the aspect of occupying the channel time is effectively guaranteed.

Drawings

Fig. 1 is a schematic diagram of a WLAN network architecture according to an embodiment of the present invention;

fig. 2 is a flowchart illustrating a method for multi-user parallel transmission according to an embodiment of the present invention;

fig. 3 is a schematic flowchart of a multi-user parallel transmission according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a frame interaction according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of another frame interaction provided in the embodiment of the present invention;

FIG. 6 is a schematic diagram of another frame interaction provided in the embodiment of the present invention;

fig. 7 is a schematic flowchart of another embodiment of a multi-user parallel transmission method according to the present invention;

fig. 8 is a schematic diagram illustrating a detailed flow of channel measurement according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a station according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a system for multi-user parallel transmission according to an embodiment of the present invention.

Detailed Description

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.

In the network architecture of the WLAN, as shown in fig. 1, the scenario may include one AP and a plurality of non-access stations STA, wherein a station may be equivalent to a user. In addition, there may be transmission scenarios of Peer stations in the network architecture of the WLAN, such as Device-to-Device (D2D) transmission mode, Peer-to-Peer (P2P) transmission mode, and Direct Link Setup (DLS) or Direct Link Setup (TDLS) transmission mode.

The following embodiments of the present invention are proposed based on the above-described scenarios.

Example one

Referring to fig. 2, a method for multi-user parallel transmission according to an embodiment of the present invention is shown, where the method may be applied to a station. The station can be an access point, and correspondingly, the opposite end of the station is a non-access station; or the site and the opposite end of the site are both sites in the peer-to-peer communication process, which is not described in this embodiment. The method may include:

s201: the site sends a wireless frame to the opposite terminal and acquires transmission time according to the process of sending the wireless frame;

the transmission time refers to the length of a time period for the station to perform frame exchange with an opposite terminal at a first inter-frame interval and/or a second inter-frame interval;

s202: the station determines the maximum length of the transmission time according to a preset determination strategy;

s203: and the station exchanges frames with the opposite terminal before the maximum length of the transmission time is reached.

It should be noted that, in the technical solution shown in fig. 2, step numbers are only used for distinguishing steps, and do not represent a sequence in an implementation process, and it can be understood that a person skilled in the art can sort the execution sequence of S201 and S202 according to an actual application scenario, which is not described in detail in this embodiment. In the technical solution shown in fig. 2, the first inter-frame Space includes a Short inter-frame Space (SIFS); the second inter-frame Space includes a Point coordination function inter-frame Space (PIFS), and the number of opposite ends of the station may be more than one.

For example, the acquiring, by the station, the transmission time according to the process of sending the radio frame specifically includes:

It should be noted that, in this example, the response frame may be a response frame fed back by at least one peer; the part of the response frame may be at least one segment in the response frame fed back by the at least one peer, or partial information in the response frame fed back by the at least one peer.

Illustratively, the obtaining, by the station, the transmission time according to the process of sending the radio frame includes:

the station acquires the transmission time through an access category competition channel of the station; alternatively, the first and second electrodes may be,

Further, the acquiring, by the station, the transmission time by using a second interframe space contention channel specifically includes:

In this embodiment, the radio frame is used to trigger the peer end to perform data transmission with the station; the wireless frame includes: trigger frame, downlink multi-user frame, downlink single-user frame, channel reservation request frame and channel measurement notification frame.

Further, the frame exchange includes any combination of:

Specifically, the channel measurement notification frame is used to notify an opposite end to perform channel measurement; the channel measurement frame can be used as a measurement target when an opposite end carries out channel measurement; the feedback frame is used for bearing a measurement result after the opposite terminal performs channel measurement.

It should be noted that, the following preferred solutions are proposed in this embodiment for determining the maximum length of the transmission time according to the preset determination policy in the technical solution shown in fig. 2.

Preferably, the determining, by the station, the maximum length of the transmission time according to a preset determination policy specifically includes:

In the above preferred embodiment, the maximum length of the transmission time predefined by the system at least includes the following:

For the transmission time, it should be further noted that, when the transmission time is within the allocated transmission period, the maximum length of the transmission time does not exceed the time period length of the allocated transmission period; wherein the transmission period comprises a service period or a limited contention window.

Further, when the transmission time is obtained outside the transmission period, the transmission time is limited by a first time length;

It is understood that the second time period may be the same as or different from the first time period. This embodiment will not be described in detail.

The embodiment provides a multi-user parallel transmission method, the maximum length of transmission time is determined by a station, the maximum time length of a transmission opportunity can be reasonably set in the uplink multi-user data transmission process, and the fairness of users in channel occupation time is effectively ensured.

Example two

Based on the same technical concept as the foregoing embodiments, the present embodiment will explain the technical solutions related to the foregoing embodiments in detail through the following specific embodiments.

Detailed description of the preferred embodiment

The present embodiment is explained based on the network architecture shown in fig. 1, where a station is an AP and a corresponding opposite station is an STA, and as shown in fig. 3, the process of the present embodiment may include:

s301: the AP sends a trigger frame to a plurality of STAs;

as can be appreciated, the trigger frame is used to trigger multiple STAs to transmit uplink multi-user data.

It should be noted that the specific implementation process of S301 may include: the AP first sends a trigger frame to contend for the channel, and tries to acquire a transmission time, which may be a transmission opportunity TXOP in the prior art or a similar concept as the transmission opportunity that involves an uplink and downlink transmission period of the AP and multiple STAs.

In the transmission time, the AP may perform frame exchange with multiple STAs with SIFS or PIFS as an inter-frame interval, and the AP is guaranteed to have priority in channel access due to the short inter-frame interval, so the AP can continuously occupy the channel for a period of time.

S302: after receiving a response frame of any triggered STA (station) at a certain time interval, the AP considers that the transmission time is successfully acquired; or receiving at least one segment of the triggered response frame of any STA after a certain time interval, and considering that the transmission time is successfully acquired; or receiving partial information of the triggered response frame of any STA after a certain time interval, and then considering that the transmission time acquisition is successful.

For example, as shown in fig. 1, when the AP triggers the STAs 1 to 4 to perform uplink transmission, the AP may consider that the transmission time acquisition is successful after receiving a response frame sent by any one of the STAs 1 to 4. If the response frame is long and the STA may divide the response frame into several segments for transmission, the AP may consider that the transmission time acquisition is successful when it receives at least one segment transmitted by any one of the STA1 to STA 4. If the STA may also carry the partial information of the response frame in other frames for transmission, the AP may also consider that the transmission time acquisition is successful when receiving the partial information sent by any one of the STAs 1 to 4. If the network system predefines sending the trigger frame even if acquiring the transmission time, when the AP sends the trigger frame, it can be considered that one transmission time is acquired.

S303: after the transmission time is obtained, the AP can send a plurality of trigger frames within the transmission time to trigger a plurality of STAs to send uplink multi-user data;

specifically, as shown in fig. 4, the triggered STAs in each trigger frame may be different, for example, the first trigger frame may trigger the STAs 1 to 4, and after receiving the uplink data of the four stations in the first list of data of the station shown in fig. 4, the AP sends a downlink frame, which carries a new trigger frame and an acknowledgement frame for the data of the STAs 1 to the STAs 4. The new trigger frame may continue to trigger STA1 to STA4, or may trigger STA1, STA2, STA4, and STA5 to send uplink data, as shown in the second row of data of the station in fig. 4;

in addition, the AP may also directly send a downlink multi-user frame or a downlink single-user frame contention channel, where the downlink multi-user frame or the downlink single-user frame carries a trigger frame, and triggers multiple STAs to send uplink multi-user data, and after obtaining transmission time, perform one or more interactions between the downlink multi-user frame and the uplink multi-user frame between the AP and the STA within the transmission time, as shown in fig. 5.

Furthermore, the AP may further send a channel reservation request frame before sending the trigger frame, the downlink multi-user frame, or the downlink single-user frame, and when receiving the channel reservation response frame sent by the STA, consider that the transmission time is successfully obtained, and then perform one or more interactions between the downlink multi-user frame or the downlink single-user frame and the uplink multi-user frame with the STA within the transmission time, where the downlink multi-user frame or the downlink single-user frame includes the trigger frame, as shown in fig. 6.

In the processes shown in fig. 4 to fig. 6, the AP sends a trigger frame, a downlink single-user frame or a downlink multi-user frame, or a channel reservation request frame to contend for transmission time, which is obtained by contending for a channel using a specific inter-frame space.

S304: when the transmission time is successfully obtained, the AP needs to ensure that the transmission time occupied by the multiple frame exchanges between the AP and the STA does not exceed the maximum length of the transmission time.

In this embodiment, the AP indicates, in the trigger frame, the access category of the uplink multiuser frame sent by the STA1 to the STA 4. Generally, both the STA and the AP establish four access class queues: the queues include AC _ BK, AC _ BE, AC _ VO and AC _ VI, and each queue buffers the data packet of the category. The AP may instruct the STAs 1 to 4 to transmit data of the AC-BE, and each STA takes out data from its own AC-BE or an AC with a priority equal to or higher than that of the AC-BE for packet transmission, in which case, the maximum length of the current transmission time is set to the TXOP Limit of the AC category indicated by the AP in the trigger frame, that is, the TXOP Limit of the AC _ BE.

Or, when the AP triggers multi-user transmission, using a maximum length predefined by the system as the maximum length that the transmission time can occupy the channel, where the specific value mode preferably includes:

1. the maximum length TXOP Limit of the transmission time corresponding to the AC with the highest priority, for example, the TXOP Limit of AC _ VO

2. TXOP Limit of the longest of the four ACs, e.g. of AC VI

3. Dedicated maximum length in case of trigger transmission

4. The maximum length of transmission time has a mapping relation with a plurality of system parameters, and the system parameters may include the number of associated STAs under the BSS, the number of STAs under the BSS that can be triggered, the number of STAs under the BSS that only support contention access, the number of STAs to be triggered within the current transmission time, the length of a transmission and/or reception buffer queue of the STA, and the length of a transmission and/or reception buffer of the AP. The maximum length of the transmission time may form a functional relationship with one or more of the above parameters, and increase (for example, the maximum length of the transmission time increases correspondingly when the number of stations to be triggered increases) or decrease (for example, the maximum length of the transmission time decreases correspondingly when the number of stations only supporting contention increases) with the increase of the parameter value, where the increased maximum length value has a preset upper limit, for example, one of the foregoing values.

The foregoing various value manners include the TXOP Limit of the AC indicated in the trigger frame and the first three of the maximum length value examples predefined by the system.

Detailed description of the invention

In this embodiment, the process of acquiring the transmission time by the AP through the contention channel and performing frame exchange with the station in the transmission time is the same as that in the first embodiment, and is not described herein again.

In this embodiment, it should be noted that the AP sends the trigger frame, the downlink single user frame carrying the trigger frame, the downlink multi-user frame carrying the trigger frame, or the channel reservation request frame to contend for the transmission time, and the transmission time is obtained by contending for the channel using a specific inter-frame interval. For example, the AP sends a trigger frame with PIFS, triggers STA1 to STA4 to perform uplink multi-user transmission, receives a response frame sent by any one of STA1 to STA4, or receives at least one segment sent by any one of STA1 to STA4, or receives partial information sent by any one of STA1 to STA4, and may consider that the transmission time acquisition is successful. After the transmission time is successfully obtained, the AP needs to determine the maximum length of the channel occupied by the transmission time, and it is ensured that the time occupied by multiple frame exchanges between the AP and the station does not exceed the maximum length.

The specific implementation process can be as follows: the AP instructs the STA1 to send data of AC _ BE, the STA2 and STA3 send data of AC _ VO, and the STA4 sends data of AC _ VI in the trigger frame, so that each STA takes out data from the AC queue instructed by itself, or the instructed AC queue and the queue with higher priority than the AC for packet transmission. In this case, the maximum value of the TXOP limits of the three ACs indicated by the AP in the trigger frame is AC _ VI, and the maximum value of the current transmission time takes the value of the TXOP Limit of AC _ VI. If the highest priority of the three ACs is AC _ VO, the maximum value of the current transmission time may also be taken as TXOP Limit of AC _ VO. Or, when the primary user indicated in the trigger frame is the STA2, the maximum length of the transmission time takes the TXOP Limit of the AC category specified to be sent by the STA2, that is, the TXOP Limit of the AC _ VO. Or, when the AP triggers multi-user transmission, using a maximum length predefined by the system as the maximum length that the transmission time can occupy the channel, where the specific value mode preferably includes:

1. TXOP Limit of the AC with the highest priority, e.g., the AC _ VO

2. TXOP Limit of the longest of the four ACs, e.g. of AC VI

3. Dedicated maximum length in case of trigger transmission

4. The maximum length of transmission time has a mapping relation with a plurality of system parameters, and the system parameters may include the number of associated STAs under the BSS, the number of STAs under the BSS that can be triggered, the number of STAs under the BSS that only support contention access, the number of STAs to be triggered within the current transmission time, the length of a transmission and/or reception buffer queue of the STA, and the length of a transmission and/or reception buffer of the AP. The maximum length of the transmission time may form a functional relationship with one or more of the above parameters, and increase with an increase in a value of the parameter (for example, the number of stations to be triggered increases, the maximum length of the transmission time increases accordingly) or shorten (for example, the number of stations that only support contention increases, the maximum length of the transmission time shortens accordingly), where the increased maximum length value has a preset upper limit, for example, one of the foregoing values.

Detailed description of the invention

In this embodiment, the process of acquiring the transmission time by the AP through the contention channel and performing frame exchange with the station in the transmission time is the same as that in the first embodiment, and is not described herein again. It should be noted that the AP sends the trigger frame, or the downlink single-user frame carrying the trigger frame, or the downlink multi-user frame carrying the trigger frame, or the channel reservation request frame to contend for the transmission time, and the transmission time is obtained by contending for the channel using a specific inter-frame interval.

In this embodiment, the trigger frame may also carry a random access resource indication while allocating uplink transmission resources for the STAs 1 to 4, respectively, for allowing associated and non-associated stations to perform random access in a contention manner and use the resources.

It should be noted that there are several ways to perform random access, and after receiving the trigger frame, the station may directly send a radio frame on the random access resource, where the radio frame may include an empty data Packet (NDP) frame, that is, a frame without MAC layer information; or a frame including MAC layer information; or transmitting a codeword for random access, etc.

Moreover, when the trigger frame carries the random access resource, the trigger frame may not need to indicate a specific AC category, and the existence of the random access resource does not affect the determination of the maximum length of the current transmission time. The specific determination method is the same as that in the first embodiment and the second embodiment.

It should be noted that when all the allocated uplink resources in the trigger frame are random access resources, the trigger frame does not indicate AC information, and at this time, the maximum length of the current transmission time may use a system predefined maximum length, which is a specific value:

1. TXOP Limit of AC with highest priority, e.g., TXOP Limit of AC _ VO

2. The most common TXOP Limit of the four ACs, e.g., the TXOP Limit of AC VI

3. Dedicated maximum length in case of trigger transmission

Detailed description of the invention

Referring to fig. 7, the implementation process of the present embodiment may include:

s701: the AP sends a trigger frame to a plurality of STAs;

Specifically, the AP may attempt to acquire a transmission time by sending a trigger frame contention channel; or the AP may also directly send a downlink multi-user frame or a downlink single-user frame carrying a trigger frame to compete for a channel, and trigger multiple STAs to send uplink multi-user data.

S702: after the AP sends out a trigger frame, receiving a response frame of any triggered STA after a certain time interval, and considering that the transmission time is successfully obtained; or after a certain time interval, at least one segment of the triggered response frame of any STA is received, and the transmission time is considered to be successfully acquired; or receiving partial information of the triggered response frame of any STA after a certain time interval, and then considering that the transmission time acquisition is successful.

In the transmission time, one or more interactions between the AP and the STA may be performed between the downlink multi-user frame and the uplink multi-user frame, or between the downlink single-user frame and the uplink multi-user frame.

Preferably, the AP may further send a channel reservation request frame before sending the trigger frame, the downlink single-user frame, or the downlink multi-user frame, and after receiving the channel reservation response frame sent by the STA, the AP considers that the transmission time is successfully obtained, and then performs one or more interactions between the downlink multi-user frame and the uplink multi-user frame with the STA within the transmission time, where the downlink multi-user frame includes the trigger frame.

In the process shown in fig. 7, the AP sends a trigger frame, a downlink single-user frame, or a downlink multi-user frame carrying a trigger frame, or a channel reservation request frame to contend for transmission time, which is obtained by contending through an AC queue on the AP side. When data is to be sent in an AC queue at an AP side, the AC starts a contention process to participate in contention, and finally the AC that successfully competes sends the data in its own queue, at this time, the AP may send a downlink single-user frame carrying a trigger frame, or send a downlink multi-user frame carrying a trigger frame, or send a trigger frame to trigger uplink transmission. In this case, the maximum length of the transmission time may be taken as the TXOP Limit corresponding to the AC category of the channel obtained by the AP through contention.

Further, if the trigger frame indicates AC of data uplink transmitted by the STA1 to the STA4, the maximum length of the transmission time may be taken as TXOP Limit corresponding to an AC category specified in the trigger frame, or as TXOP Limit corresponding to an AC category that obtains a channel through contention, or a larger value of the two TXOP Limit, or a maximum length predefined by a system is used as the maximum length that the transmission time can occupy the channel, and the specific taking mode preferably includes:

2. TXOP Limit of the longest of the four ACs, e.g. of AC VI

3. Dedicated maximum length in case of trigger transmission

The various value taking modes include the TXOP Limit of the AC that contends for the channel and obtains the transmission time, the TXOP Limit of the AC indicated in the trigger frame, and the first three of maximum length value taking examples predefined by the system.

Detailed description of the preferred embodiment

In this embodiment, the process of the AP contending for the channel, acquiring the transmission time, and exchanging frames with the station during the transmission time is the same as that in the fourth embodiment. The AP sends a trigger frame, a downlink single-user frame carrying the trigger frame or a downlink multi-user frame carrying the trigger frame, or a channel reservation request frame contends for transmission time, and the contention is obtained through an AC queue at the AP side. And the AC which successfully competes sends the data of the queue of the AC, and at the moment, the AP can send a downlink single-user frame carrying a trigger frame, a downlink single-user frame carrying a trigger frame or a downlink multi-user frame, or a trigger frame to trigger uplink transmission. In this case, the maximum length of the transmission time may be obtained by contending to obtain the TXOP Limit corresponding to the AC category of the channel.

If the AP indicates the AC category of the data uplink transmitted by each of the STAs 1 to 4 in the trigger frame, for example, the STA1 is instructed to transmit AC _ BE data, the STA2 and the STA3 transmit AC _ VO data, and the STA4 transmits AC _ VI data, the maximum length of transmission time may BE a maximum value of the AC, that is, TXOP Limit of AC _ VI, or a TXOP Limit of an AC with a highest priority in the AC, that is, TXOP Limit of AC _ VO, or a TXOP Limit corresponding to an AC category of a channel obtained through contention, or a maximum length predefined by a system is used, which preferably includes:

2. TXOP Limit of the longest of the four ACs, e.g. of AC VI

3. Dedicated maximum length in case of trigger transmission

4. The maximum length of transmission time has a mapping relation with several system parameters, and the system parameters may include the number of associated STAs under the BSS, the number of STAs capable of being triggered under the BSS, the number of STAs supporting only contention access under the BSS, the number of STAs to be triggered in the current transmission time, the length of a transmission and/or reception buffer queue of the STA, and the length of a transmission and/or reception buffer of the AP. The maximum length of the transmission time may form a functional relationship with one or more of the above parameters, and increase with an increase in a value of the parameter (for example, the number of stations to be triggered increases, the maximum length of the transmission time increases accordingly) or shorten (for example, the number of stations that only support contention increases, the maximum length of the transmission time shortens accordingly), where the increased maximum length value has a preset upper limit, for example, one of the foregoing values.

The various value modes include the contention channel and the TXOP Limit of the AC of the transmission time, various value conditions of the TXOP Limit of the AC indicated in the trigger frame, and the first three of maximum length value examples predefined by the system.

Detailed description of the preferred embodiment

In this embodiment, when the transmission time is obtained after a certain AC queue of the AP successfully competes, and a trigger frame sent by the AP carries a random access resource in addition to allocating an uplink transmission resource to the STA, the trigger frame is a random access resource and does not need to indicate a specific AC, so that the presence of the random access resource does not affect the determination of the maximum length of the current transmission time. The specific determination method is as described in specific example four and specific example five.

It should be noted that, when all the allocated uplink resources in the trigger frame are random access resources, the trigger frame does not indicate AC information, and the maximum length of the current transmission time uses TXOP Limit corresponding to an AC category of a channel obtained through contention, or uses a system predefined maximum length, and the method for taking the system predefined maximum length is the same as that in the fourth specific embodiment, and is not described herein again.

Detailed description of the preferred embodiment

In the above embodiment, the transmission time is obtained by the AP sending a radio frame, and the AP and the one or more STAs perform one or more frame exchanges with SIFS or PIFS during the transmission time.

However, in this embodiment, the stations participating in the communication are peer stations, for example, D2D transmission mode, P2P transmission mode, or DLS/TDLS transmission mode. In a scenario where peer-to-peer stations communicate with each other, a station may trigger one or more other stations to send data to itself, and then the data sending manner of the one or more other stations is multi-user transmission. The station acquires the transmission time, and performs frame exchange with other stations within the transmission time, and a specific implementation manner of determining the maximum length of the transmission time by the station is the same as the specific implementation manner of determining the maximum length of the transmission time by the AP described in the first to sixth embodiments, and is not described herein again.

Detailed description of the preferred embodiment

It should be noted that, in this embodiment, if the transmission time obtained by the AP is within one transmission period (service period) allocated by another frame, the maximum length of the transmission time must not exceed the length of the transmission period, except for using the determination method used in the foregoing embodiment.

Here, a transmission period refers to a period of time during which the AP continuously uses the wireless medium, during which time the AP may transmit one or more downlink frames to one or more STAs, or during which one or more transmission opportunities and/or transmission times are initiated. The transmission period may also be a Restricted contention Window (RAW). Within this window, a particular set of stations is allowed access to the channel.

Alternatively, the transmission time obtained by the AP during the transmission period and the transmission time obtained by the AP outside the transmission period may adopt the same or different maximum length values. For different cases, the transmission time outside the transmission period uses a maximum length value X, while the transmission time inside the transmission period uses a maximum length value Y, which may be greater than, equal to, or less than X, and Y is limited by the transmission period length.

Detailed description of the preferred embodiment

The present embodiment is described with respect to obtaining transmission time and determining the maximum length of the transmission time in the channel measurement process, and the basic flow of the channel measurement is as follows: the first station initiating the measurement sends a channel measurement notification frame to notify other one or more second stations to perform channel measurement, and the other one or more second stations may perform channel measurement based on a data packet received from the first station before or may perform measurement based on a channel measurement frame dedicated to measurement sent by the first station, and report a measurement result to the first station after the measurement is completed.

The second station may report the measurement result in multiple ways:

the first reporting mode: after receiving the channel measurement frame, a first second station of a notification in a channel measurement notification frame sent by the first station waits for an SIFS interval to immediately feed back, and other second stations report a measurement result after waiting for initiating station polling;

and a second reporting mode: and the second station carries out measurement after receiving the channel measurement frame, and reports the measurement result in a multi-user mode after receiving the trigger frame sent by the first station.

It should be noted that the first station initiating the measurement may be an AP or some STA other than the AP. The channel measurement notification frame is typically a Null Data Packet notification frame (NDPA); the channel measurement frame is typically an NDP; the trigger frame is a trigger frame or a Beamforming report poll (Beamforming report poll) frame.

In this embodiment, taking the following measurements as an example, referring to fig. 8, a specific process may include:

s801: and the AP sends an NDPA frame and requests a plurality of STAs to measure and report.

Specifically, the AP first sends an NDPA frame, and tries to acquire a transmission time, which may be a transmission opportunity TXOP in the prior art or a concept related to uplink and downlink transmission periods of the AP and multiple STAs, similar to the transmission opportunity, in a similar manner to the above-described specific embodiments.

S802: at an SIFS interval after the NDPA frame, the AP transmits an NDP frame;

it should be noted that the NDPA frame carries identification information of the STA that needs to perform measurement, so that the STA checks whether the identification matches the identification of itself after receiving the NDPA frame, and if the identification matches the identification, it indicates that it needs to perform channel measurement, measures the NDP frame, and stores the measurement result.

S803: and (4) after the NDP is sent, the STA reports the measurement result.

Specifically, with the reporting method of the first mode, the first station in the NDPA sends a feedback frame after SIFS, feeds back a measurement result to the AP, and the other STAs send a feedback frame after waiting for the AP to send a Beamforming report poll frame and receiving an SIFS interval after the Beamforming report poll frame.

And by adopting the reporting method of the second mode, after the NDP frame is finished, waiting for an SIFS interval, sending out a trigger frame by the AP, triggering a plurality of STAs for measurement to report the measurement result, and sending a feedback frame by adopting an uplink multi-user mode when the plurality of STAs report. After receiving the uplink multi-user feedback frame, the AP may continue to send a Beamforming report poll frame or a trigger frame, and request other stations to continue to report the measurement result in the uplink multi-user manner.

For the first mode, after sending out NDPA, the AP waits for 2 SIFS + NDP times, and receives at least one segment of a feedback frame of any station that is required to be measured, and then considers that transmission time is acquired;

for the second mode, after sending the NDPA, the NDP, and the trigger frame, the AP waits for the SIFS interval to receive the feedback frame of any triggered STA, and then considers that the transmission time is successfully obtained; or receiving at least one segment of the triggered feedback frame of any STA after a certain time interval, and considering that the transmission time is successfully acquired; or receiving partial information of the feedback frame of any triggered STA after a certain time interval, and then considering that the transmission time acquisition is successful.

It should be noted that, during the transmission time, the AP may also use any combination of the first and second modes. For example, a polling mode of each station may be adopted firstly, and a mode of triggering multi-user parallel reporting is used secondly.

In the channel measurement process, the AP acquires transmission time by sending an NDPA frame, and the maximum length of the transmission time selects the TXOP Limit corresponding to the AC type used by the NDPA frame; or selecting a maximum length predefined by the system as the maximum length of the channel occupied by the transmission time, wherein the specific value taking mode preferably comprises the following steps:

2. TXOP Limit of the longest of the four ACs, e.g. of AC VI

3. Dedicated maximum length in case of trigger transmission

The technical solution of the first embodiment is described in detail by nine specific embodiments, and the maximum length of the transmission time is determined by the station, so that the maximum time length of the transmission opportunity can be reasonably set in the uplink multi-user data transmission process, and fairness of the user in occupying the channel time is effectively guaranteed.

EXAMPLE III

Based on the same technical concept of the foregoing embodiment, referring to fig. 9, it shows a structure of a station 90 provided by an embodiment of the present invention, where the station 90 may include: a sending module 901, an obtaining module 902, a determining module 903 and an interacting module 904; wherein the content of the first and second substances,

the sending module 901 is configured to send a wireless frame to an opposite terminal;

the obtaining module 902 is configured to obtain a transmission time according to a process of sending the radio frame; the transmission time refers to the length of a time period for the station to perform frame exchange with the opposite terminal at a first inter-frame interval and/or a second inter-frame interval;

the determining module 903 is configured to determine the maximum length of the transmission time according to a preset determination policy;

the interaction module 904 is configured to perform frame exchange with the peer end before the maximum length of the transmission time is reached.

In the foregoing scheme, the obtaining module 902 is specifically configured to:

the transmission time is obtained when the sending module 901 sends the wireless frame.

acquiring the transmission time through an access category competition channel of the mobile terminal; alternatively, the first and second liquid crystal display panels may be,

when the time length of detecting the idle channel is greater than or equal to the second inter-frame interval, the sending module 901 is immediately triggered to send the radio frame, and the transmission time is obtained

In the foregoing scheme, the determining module 903 is specifically configured to:

acquiring transmission time when a second inter-frame interval competition channel is adopted; and the number of the first and second groups,

acquiring the transmission time through an access category competition channel; the station indicates the access categories of all opposite terminals when sending data in a trigger frame sent when competing for the channel through the access categories; and (c) a second step of,

In the foregoing solution, the determining module 903 is specifically configured to:

This embodiment provides a website 90, confirms the maximum length of transmission time through website 90, can rationally set up transmission opportunity maximum time length in the uplink multi-user data transmission process, has guaranteed effectively that the user is in the fairness of occupying channel time.

Example four

Based on the same technical concept as the foregoing embodiment, referring to fig. 10, a system 100 for multi-user parallel transmission according to an embodiment of the present invention is shown, where the system 100 includes a station 90 and an opposite end 110 corresponding to the station 90; wherein the content of the first and second substances,

the station 90 is configured to send a wireless frame to the peer 110, and obtain transmission time according to a process of sending the wireless frame; wherein, the transmission time refers to a length of a time period for which the station 90 and the peer 110 perform frame exchange with a first inter-frame space and/or a second inter-frame space;

determining the maximum length of the transmission time according to the transmission time acquired in the process of sending the wireless frame and a preset determination strategy;

and exchanging frames with the opposite terminal 110 before the maximum length of the transmission time is reached.

It should be noted that, in this embodiment, the station may be an AP, and the opposite end is an STA corresponding to the AP.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims

1. A method for multi-user parallel transmission, the method comprising:

a site sends a wireless frame to an opposite end, and acquires transmission time according to the process of sending the wireless frame; the transmission time refers to the length of a time period for the station to perform frame exchange with the opposite terminal at a first inter-frame interval and/or a second inter-frame interval;

the station exchanges frames with the opposite terminal before the maximum length of the transmission time is reached;

the determining, by the station, the maximum length of the transmission time according to a preset determination policy specifically includes:

acquiring transmission time when the station competes for a channel; wherein, the trigger frame sent during the channel competition indicates the access category of the data sent by the opposite terminal;

and the station determines the maximum length of the transmission time according to at least one of the maximum length of the transmission opportunity of the access category of the acquired channel, the maximum length of the transmission opportunity corresponding to the access category indicated in the trigger frame, or the maximum length of the transmission time predefined by the system.

2. The method of claim 1, wherein the first interframe spacing interval comprises a short interframe spacing (SIFS); the second inter-frame space comprises a point coordination function inter-frame space, PIFS.

3. The method of claim 1, wherein the obtaining, by the station, the transmission time according to the process of sending the radio frame specifically comprises:

4. The method of claim 1, wherein the obtaining, by the station, the transmission time according to the process of sending the radio frame specifically comprises:

5. The method of claim 1, wherein the obtaining, by the station, the transmission time according to the process of sending the radio frame specifically comprises:

6. The method according to claim 5, wherein the station acquires the transmission time by using a second interframe space contention channel, specifically comprising:

7. The method of claim 1, wherein the radio frame is used to trigger data transmission between the peer and the station; the wireless frame includes: trigger frame, downlink multi-user frame, downlink single-user frame, channel reservation request frame, and channel measurement notification frame.

8. The method of claim 1, wherein the frame exchange comprises any combination of:

9. The method according to claim 1, wherein the station determines the maximum length of the transmission time according to a predetermined determination policy, specifically comprising:

the station takes at least one of the maximum length of the transmission opportunity corresponding to the access category indicated in the trigger frame or the maximum length of the transmission time predefined by the system as the maximum length of the transmission time.

10. The method of claim 1, wherein the determining, by the station, the maximum length of the transmission time according to the transmission time obtained in the process of sending the radio frame and a preset determination policy specifically includes:

the station determines the maximum value of the maximum lengths of the transmission opportunities corresponding to the access categories indicated in the trigger frame, or the maximum length of the transmission opportunities corresponding to the access category with the highest priority in the access categories indicated in the trigger frame; or at least one of the maximum transmission opportunity length corresponding to the access category of the primary user in the opposite terminal or the maximum length of the transmission time predefined by the system is used as the maximum length of the transmission time.

11. The method of claim 1, wherein the station determines the maximum length of the transmission time according to the transmission time obtained during the transmission of the radio frame and a predetermined determination policy, and further comprising:

12. The method of claim 1, wherein the determining, by the station, the maximum length of the transmission time according to the transmission time obtained in the process of sending the radio frame and a preset determination policy specifically includes:

13. The method of claim 1, wherein the determining, by the station, the maximum length of the transmission time according to the transmission time obtained in the process of sending the radio frame and a preset determination policy specifically includes:

14. The method according to any of claims 9 to 13, wherein the maximum length of transmission time predefined by the system comprises at least one of:

15. The method of claim 1, wherein when the transmission time is within an allocated transmission period, the maximum length of the transmission time does not exceed the period length of the allocated transmission period; wherein the transmission period comprises a service period or a limited contention window.

16. The method of claim 15, wherein when the transmission time is obtained outside the transmission period, the transmission time is limited by a first time length;

17. A station, characterized in that the station comprises: the system comprises a sending module, an obtaining module, a determining module and an interaction module; wherein the content of the first and second substances,

the interaction module is used for exchanging frames with the opposite terminal before the maximum length of the transmission time is reached;

the determining module is specifically configured to: acquiring transmission time when competing for a channel; wherein, the trigger frame sent during the channel competition indicates the access category of the data sent by the opposite terminal; and determining the maximum length of the transmission time according to at least one of the maximum length of the transmission opportunity of the access category of the acquired channel, the maximum length of the transmission opportunity corresponding to the access category indicated in the trigger frame, or the maximum length of the transmission time predefined by the system.

18. The station of claim 17, wherein the first interframe spacing interval comprises a short interframe spacing (SIFS); the second inter-frame space comprises a point coordination function inter-frame space, PIFS.

19. The station according to claim 17, wherein the obtaining module is specifically configured to:

20. The station according to claim 17, wherein the obtaining module is specifically configured to:

21. The station according to claim 17, wherein the obtaining module is specifically configured to:

22. The station according to claim 21, wherein the obtaining module is specifically configured to:

23. The station of claim 17, wherein the radio frame is configured to trigger data transmission between the peer and the station; the wireless frame includes: trigger frame, downlink multi-user frame, downlink single-user frame, channel reservation request frame and channel measurement notification frame.

24. The station of claim 17, wherein the frame exchange comprises any combination of:

25. The station according to claim 17, wherein the determining module is specifically configured to:

and taking at least one of the maximum length of the transmission opportunity corresponding to the access category indicated in the trigger frame or the maximum length of the transmission time predefined by the system as the maximum length of the transmission time.

26. The station according to claim 17, wherein the determining module is specifically configured to:

the maximum value of the maximum transmission opportunity lengths corresponding to the access categories indicated in the trigger frame or the maximum transmission opportunity length corresponding to the access category with the highest priority in the access categories indicated in the trigger frame is obtained; or at least one of the maximum transmission opportunity length corresponding to the access category of the primary user in the opposite terminal or the maximum length of the transmission time predefined by the system is used as the maximum length of the transmission time.

27. The station according to claim 17, wherein the determining module is specifically configured to:

28. The station according to claim 17, wherein the determining module is specifically configured to:

29. The station according to claim 17, wherein the determining module is specifically configured to:

30. A station as claimed in any one of claims 25 to 29, wherein the maximum length of transmission time predefined by the system comprises at least one of:

31. The station of claim 17, wherein when the transmission time is within an allocated transmission period, the maximum length of the transmission time does not exceed the length of the allocated transmission period; wherein the transmission period comprises a service period or a limited contention window.

32. The station of claim 31, wherein the transmission time is limited using a first length of time when the transmission time is obtained outside the transmission period;

33. A multi-user parallel transmission system is characterized in that the system comprises a site and an opposite end corresponding to the site; wherein the content of the first and second substances,

the station is used for sending a wireless frame to an opposite terminal and acquiring transmission time according to the process of sending the wireless frame; the transmission time refers to the length of a time period for the station to perform frame exchange with the opposite terminal at a first inter-frame interval and/or a second inter-frame interval;

and exchanging frames with the opposite terminal before the maximum length of the transmission time is reached;

the station is specifically configured to implement that the station determines the maximum length of the transmission time according to a preset determination policy by using the following method:

acquiring transmission time when a contention channel is adopted; wherein, the trigger frame sent during the channel competition indicates the access category of the data sent by the opposite terminal;

and determining the maximum length of the transmission time according to at least one of the maximum length of the transmission opportunity of the access category of the acquired channel, the maximum length of the transmission opportunity corresponding to the access category indicated in the trigger frame, or the maximum length of the transmission time predefined by the system.