CN108886810B

CN108886810B - Channel access method, device and system

Info

Publication number: CN108886810B
Application number: CN201680083540.8A
Authority: CN
Inventors: 李德建; 刘培
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2016-04-18
Filing date: 2016-04-18
Publication date: 2020-09-25
Anticipated expiration: 2036-04-18
Also published as: CN108886810A; WO2017181327A1

Abstract

The invention provides a channel access method, equipment and a system, wherein the method comprises the following steps: the AP sends a first message to each member STA in the STA group corresponding to the first STA according to the obtained load rate change information, and indicates each member STA in the STA group to access a channel in a grouping SP which is distributed by the AP for the STA group corresponding to the first STA, wherein the positions of all members in the STA group are adjacent, and after the first STA receives distribution information of the grouping SP sent by the AP, the first STA accesses the channel in the grouping SP according to the distribution information. According to the technical scheme provided by the embodiment of the invention, the AP can directly allocate a longer packet SP for the STA group corresponding to the first STA, so that the first STA sends all load data in the packet SP in real time, and directionally allocates the residual time to other members in the STA group, and the monitoring energy consumption of other STAs outside the STA group is saved while the real-time communication requirement of the first STA is met.

Description

Channel access method, device and system

Technical Field

The present invention relates to communications technologies, and in particular, to a channel access method, device, and system.

Background

With the development of safe cities and the enhancement of requirements of people on important occasions, important assets, cell safety and monitoring disaster prevention, a low-power-consumption and low-cost wireless Video Personal area network (VPAN for short) for wireless Video monitoring is increasingly emphasized. Under the scene that cable and power line deployment are difficult, wireless video monitoring has the advantage of flexibility and low-cost deployment. An infrastructure Service Set (BSS) of VPAN is a star topology composed of an Access Point (AP) and a certain number of Stations (STA), and is mainly oriented to security and protection fields and indoor/outdoor wireless video monitoring. After the STA collects real-time video signals and forms video data through video coding, the video data can be sent to the AP through a wireless channel, and the AP sends the received video data to an upper layer user (a video monitoring center) of a VPAN network in a wireless or wired mode to form a video which can be displayed by the user. The video monitoring has a definite requirement on the real-time performance of the VPAN, and the video images in a monitoring place can be sent to a video monitoring center as fast as possible, so that a user can rapidly handle an emergency through the video monitoring.

A Service Period (SP) based on scheduling is an important means for guaranteeing real-time transmission. The AP allocates SPs to the STAs in the beacon interval period by periodically transmitting beacon frames, and specifically, the AP may allocate SPs to a specific STA for use; the source and destination Association Identifier (AID) of the SP may also be set to broadcast AID, so as to allow all STAs in the BSS to dynamically apply for the SP, so as to improve the real-time performance of transmission; the AP may also reallocate the remaining time of the SP allocated to one STA to shorten the delay of some other STAs with channel access requirements. When the AP dynamically allocates the SP, polling needs to be performed between the AP and the STA, and the SP is dynamically allocated after the communication requirements of the STA are collected.

After the STA collects real-time video signals and forms video data through video coding, the video data can be sent to the AP through a wireless channel within the allocated channel access time according to the SP scheduled by the AP.

When the STA uses a Variable Bit Rate (VBR) video coding scheme, a large amount of burst data streams are generated due to the change of the monitored picture. For example, after the STA finds the monitored target, the load rate may increase greatly, and the AP needs to allocate a longer SP to transmit data. However, the AP cannot accurately predict the real-time load of the STA, so the SP allocated to the STA by the AP may have the following two situations: first, if the SP is too short, the STA needs to wait for a next Transmission Opportunity (TXOP) (for example, SP or contention period of broadcast AID) to arrive, so that the STA may face a delay caused by waiting for the next TXOP and a delay caused by polling access or contention access to access the channel in the next TXOP, and cannot meet the real-time communication requirement; secondly, if the SP is too long, the remaining time of the SP needs to be reallocated, so that all other STAs with communication needs need to keep listening during the SP, thereby increasing the energy consumption of all other STAs with communication needs.

Disclosure of Invention

In view of the above drawbacks in the prior art, the present invention provides a channel access method, device and system, which are used to improve the real-time performance of STA transmission and save energy consumption of STA.

In a first aspect, the present invention provides a channel access method, including:

the method comprises the steps that an Access Point (AP) acquires load rate change information of a first Station (STA);

the AP sends a first message to each member STA in the STA group corresponding to the first STA according to the load rate change information, wherein the first message carries the distribution information of the group service period SP distributed by the AP for the STA group corresponding to the first STA; the first message is used for indicating each member STA in the STA group to access the channel in the grouping SP according to the distribution information, and the positions of the member STAs in the STA group are adjacent.

With the channel access method provided by the first aspect, the AP sends a first message to each member STA in the STA group corresponding to the first STA according to the obtained load rate change information, instructs each member STA in the STA group to access the channel within the group SP allocated by the AP to the STA group corresponding to the first STA, and has adjacent geographical positions, therefore, when the monitoring picture of the first STA changes and the load rate changes, the AP does not need to accurately predict the real-time load of the first STA, but may directly allocate a longer packet SP to the group of STAs to which the first STA corresponds, so that the first STA transmits all the payload data that has entered the buffer in the packet SP in real time, and directionally allocates the remaining time to other members in the group of STAs with potentially high payload, therefore, the real-time communication requirement of the first STA is met, and the monitoring energy consumption of other STAs outside the STA group caused by the need of monitoring the broadcast SP is saved.

In a possible implementation manner of the first aspect, the at least one STA group corresponding to the first STA, and the sending, by the AP, the first message to each member STA in the STA group corresponding to the STA according to the load rate change information specifically includes:

the AP sends a second message to each member STA in a first STA group corresponding to the first STA according to the load rate change information, wherein the second message carries distribution information of a first packet SP distributed by the AP for the first STA group corresponding to the first STA; the second message is used for indicating each member STA in the first STA group to access the channel in the first grouping SP according to the distribution information corresponding to the first grouping SP, and the first STA group is an STA group which can be accessed into the channel first by the first STA in the STA group corresponding to the first STA.

Through the channel access method provided by the above embodiment, the AP sends the allocation information of the first packet SP to each member STA in the first STA group corresponding to the first STA, where the first STA group is an STA group in which the first STA in the STA group corresponding to the first STA can first access the channel, and thus the first STA with a high communication demand can access the channel as early as possible, and the time delay caused by the first STA competing for the access channel is reduced.

In one possible implementation manner of the first aspect, before the AP acquires the load rate change information of the STA, the method further includes:

and the AP acquires the adjacent relation of the STAs and sends a third message to the STAs according to the adjacent relation, wherein the third message carries the grouping information of the STA group corresponding to the STAs.

In one possible implementation manner of the first aspect, after the AP acquires the load rate change information of the first STA, the method further includes:

and the AP sends a fourth message to other member STAs except the first STA in the first STA group according to the grouping information, wherein the fourth message is used for indicating the STAs receiving the fourth message to keep in an active state.

With the channel access method provided by the foregoing embodiment, after acquiring the load rate change information of the first STA, the AP sends a fourth message to other member STAs in the first STA group except the first STA to indicate that the other member STAs keep active, so that STAs adjacent to the first STA start trying to access the channel after the first STA finishes transmitting data and at the first time after each STA monitors a moving object, thereby reducing a delay caused by the STA monitoring that high-priority data of the moving object cannot be immediately sent due to hibernation.

In a possible implementation manner of the first aspect, the second message is further configured to instruct the first STA to send an intra-group grant frame after the first STA finishes transmitting data in the first packet SP; the intra-group grant frame is used to instruct other member STAs in the first STA group except the first STA to access the channel within the remaining time of the first packet SP.

In one possible implementation of the first aspect, the method further comprises:

after the preset time, the AP sends a fifth message to each member STA in a second STA group corresponding to a second STA in the first STA group, where the fifth message carries allocation information of a second packet SP allocated by the AP to the second STA group corresponding to the second STA, and the second STA group is an STA group in which the second STA in the STA group corresponding to the second STA can first access a channel.

With the channel access method provided in the foregoing embodiment, after the AP receives the sixth message sent by the first STA for the first time, after a pre-estimated preset time, a second packet SP is allocated to the second STA group corresponding to the second STA in advance, so that the second STA can access the channel as soon as possible.

In a possible implementation manner of the first aspect, the acquiring, by the AP, load rate change information of the first STA specifically includes:

and the AP receives a sixth message sent by the first STA, wherein the sixth message is used for determining the load rate change information by the AP.

In one possible implementation of the first aspect, the grouping information includes: group identification, STA identification of each member STA in the STA group, and channel access sequence of each member STA in the STA group.

In one possible implementation of the first aspect, the allocation information comprises at least one of the following information: the group identification, the starting time of the group SP, the duration of the group SP and the type of the group SP, wherein the type of the group SP is used for indicating the channel access mode of each member STA in the STA group.

In a possible implementation manner of the first aspect, the channel access manner includes: and accessing the channels according to a preset sequence or a competition mode.

In a second aspect, the present invention provides a channel access method, including:

a first station STA receives a first message sent by an access point AP, wherein the first message carries distribution information of a packet service period SP distributed by the AP to an STA group corresponding to the first STA according to load rate change information, and the positions of all member STAs in the STA group are adjacent;

the first STA accesses the channel within the packet SP according to the allocation information.

In a possible implementation manner of the second aspect, the at least one STA group corresponding to the first STA receives a first message of a packet service period SP sent by an AP, and specifically includes:

and the first STA receives a second message sent by the AP, wherein the second message carries the distribution information of a first packet SP distributed by the AP to a first STA group corresponding to the first STA according to the load rate change information, and the first STA group is an STA group which can be firstly accessed into a channel by the first STA in the STA group corresponding to the first STA.

In a possible implementation manner of the second aspect, before the first STA receives the allocation information of the first packet SP sent by the AP, the method further includes:

and the first STA receives a third message sent by the AP, wherein the third message carries grouping information of the STA group corresponding to the first STA, and the grouping information is determined by the AP according to the acquired adjacent relation of the STAs.

In one possible embodiment of the second aspect, the method further comprises:

and the first STA receives a fourth message sent by the AP, wherein the fourth message is used for indicating the STA to keep in an active state, and the fourth message is sent by the AP when the packet SP is allocated to other STA groups except the first STA group in the STA group corresponding to the first STA.

In one possible implementation of the second aspect, the method further comprises:

after the first STA finishes transmitting data in the first packet SP, sending an intra-packet grant frame; the intra-group grant frame is used to instruct other member STAs in the first STA group except the first STA to access the channel within the remaining time of the first packet SP.

and the first STA receives a fifth message sent by the AP, wherein the fifth message carries allocation information of a second packet SP allocated by the AP for a second STA group corresponding to the second STA, and the fifth message is sent after the AP allocates the packet SP for other STA groups except the first STA group in the STA group corresponding to the first STA for a preset time.

In a possible implementation manner of the second aspect, before the first STA receives the allocation information of the packet SP transmitted by the AP, the method further includes:

the first STA sends a sixth message to the AP, the sixth message for the AP to determine load rate change information.

In one possible implementation of the second aspect, the grouping information includes: group identification, STA identification of each member STA in the STA group, and channel access sequence of each member STA in the STA group.

In one possible embodiment of the second aspect, the allocation information comprises at least one of the following information: the group identification, the starting time of the group SP, the duration of the group SP and the type of the group SP, wherein the type of the group SP is used for indicating the channel access mode of each member STA in the STA group.

In a possible implementation manner of the second aspect, the channel access manner includes: and accessing the channels according to a preset sequence or a competition mode.

The beneficial effects of the channel access method provided by the second aspect and each possible implementation manner of the second aspect may refer to the beneficial effects brought by each possible implementation manner of the first aspect, and are not described herein again.

In a third aspect, the present invention provides an access point AP, including:

the processing module is used for acquiring load rate change information of the STA (station) of the first station;

a sending module, configured to send a first message to each member STA in an STA group corresponding to a first STA according to load rate change information, where the first message carries allocation information of a packet service period SP allocated by an AP to the STA group corresponding to the first STA; the first message is used for indicating each member STA in the STA group to access the channel in the grouping SP according to the distribution information, and the positions of the member STAs in the STA group are adjacent.

In a possible implementation manner of the third aspect, the STA group corresponding to the first STA is at least one, and the sending module is specifically configured to:

according to the load rate change information, sending a second message to each member STA in a first STA group corresponding to the first STA, wherein the second message carries distribution information of a first packet SP distributed by the AP for the first STA group corresponding to the first STA; the second message is used for indicating each member STA in the first STA group to access the channel in the first grouping SP according to the distribution information corresponding to the first grouping SP, and the first STA group is an STA group which can be accessed into the channel first by the first STA in the STA group corresponding to the first STA.

In a possible implementation manner of the third aspect, the processing module is further configured to:

before obtaining the load rate change information of the STA, obtaining the adjacent relation of each STA, and indicating a sending module to send a third message to each STA according to the adjacent relation, wherein the third message carries the grouping information of the STA group corresponding to each STA.

In a possible implementation manner of the third aspect, the sending module is further configured to:

after the processing module acquires the load rate change information of the first STA, a fourth message is sent to other member STAs except the first STA in the first STA group according to the grouping information, and the fourth message is used for indicating the STAs receiving the fourth message to keep in an active state.

In a possible implementation manner of the third aspect, the second message is further used to instruct the first STA to send an intra-group grant frame after the first STA finishes transmitting data in the first packet SP; the intra-group grant frame is used to instruct other member STAs in the first STA group except the first STA to access the channel within the remaining time of the first packet SP.

and after the preset time, sending a fifth message to each member STA in a second STA group corresponding to a second STA in the first STA group, wherein the fifth message carries the distribution information of a second packet SP distributed by the AP for the second STA group corresponding to the second STA, and the second STA group is an STA group which can be firstly accessed into a channel by the second STA in the STA group corresponding to the second STA.

In one possible implementation manner of the third aspect, the AP further includes:

and the receiving module is used for receiving a sixth message sent by the first STA, and the sixth message is used for the processing module to determine the load rate change information.

In one possible implementation of the third aspect, the grouping information includes: group identification, STA identification of each member STA in the STA group, and channel access sequence of each member STA in the STA group.

In one possible implementation of the third aspect, the allocation information comprises at least one of the following information: the group identification, the starting time of the group SP, the duration of the group SP and the type of the group SP, wherein the type of the group SP is used for indicating the channel access mode of each member STA in the STA group.

In a possible implementation manner of the third aspect, the channel access manner includes: and accessing the channels according to a preset sequence or a competition mode.

The beneficial effects of the AP provided by the third aspect and the possible embodiments of the third aspect may refer to the beneficial effects brought by the possible embodiments of the first aspect and the first aspect, and are not described herein again.

In a fourth aspect, the present invention provides a station STA, including:

the system comprises a receiving module, a sending module and a sending module, wherein the receiving module is used for receiving a first message sent by an Access Point (AP), the first message carries distribution information of a packet Service Period (SP) distributed by the AP to an STA group corresponding to the STA according to the load rate change information of the STA, and the positions of all member STAs in the STA group are adjacent;

and the processing module is used for accessing the channel in the packet SP according to the distribution information.

In a possible implementation manner of the fourth aspect, the STA group corresponding to the STA is at least one, and the receiving module is specifically configured to:

and receiving a second message sent by the AP, wherein the second message carries allocation information of a first packet SP allocated by the AP to a first STA group corresponding to the STA according to the load rate change information of the STA, and the first STA group is an STA group which can be accessed into a channel firstly by the STA in the STA group corresponding to the STA.

In a possible implementation manner of the fourth aspect, the receiving module is further configured to:

before receiving the distribution information of the grouping SP sent by the AP, receiving a third message sent by the AP, wherein the third message carries the grouping information of the STA group corresponding to the STA, and the grouping information is determined by the AP according to the acquired adjacent relation of the STAs.

and receiving a fourth message sent by the AP, wherein the fourth message is used for indicating the STA to keep in an active state, and the fourth message is sent when the AP allocates a packet SP for other STA groups except the STA group in the STA group corresponding to the STA.

In one possible implementation of the fourth aspect, the STA further includes:

a sending module, configured to send an intra-group grant frame after data is transmitted in the group SP; the intra-group grant frame is used to instruct other member STAs in the group of STAs to access the channel for the remaining time of the group SP.

and receiving a fifth message sent by the AP, wherein the fifth message carries allocation information of a second packet SP allocated by the AP for a second STA group corresponding to the second STA, and the fifth message is sent after the AP allocates the packet SP for other STA groups except the STA group in the STA group corresponding to the STA, and the packet SP is sent after a preset time.

In a possible implementation manner of the fourth aspect, the sending module is further configured to:

and before the receiving module receives the second message sent by the AP, sending a sixth message to the AP, wherein the sixth message is used for determining the load rate change information by the AP.

In one possible implementation of the fourth aspect, the grouping information includes: group identification, STA identification of each member STA in the STA group, and channel access sequence of each member STA in the STA group.

In one possible implementation of the fourth aspect, the allocation information comprises at least one of the following information: the group identification, the starting time of the group SP, the duration of the group SP and the type of the group SP, wherein the type of the group SP is used for indicating the channel access mode of each member STA in the STA group.

In a possible implementation manner of the fourth aspect, the channel access manner includes: and accessing the channels according to a preset sequence or a competition mode.

The beneficial effects of the STA provided in the fourth aspect and the possible embodiments of the fourth aspect may refer to the beneficial effects brought by the possible embodiments of the first aspect and the first aspect, and are not described herein again.

In a fifth aspect, the present invention provides an access point AP, including:

the processor is used for acquiring load rate change information of the STA (station) of the first station;

a transmitter, configured to send a first message to each member STA in an STA group corresponding to a first STA according to load rate change information, where the first message carries allocation information of a packet service period SP allocated by an AP to the STA group corresponding to the first STA; the first message is used for indicating each member STA in the STA group to access the channel in the grouping SP according to the distribution information, and the positions of the member STAs in the STA group are adjacent.

In a possible implementation manner of the fifth aspect, the STA group corresponding to the first STA is at least one, and the transmitter is specifically configured to:

In one possible implementation of the fifth aspect, the processor is further configured to:

before obtaining the load rate change information of the STA, obtaining the adjacent relation of each STA, and indicating a transmitter to transmit a third message to each STA according to the adjacent relation, wherein the third message carries the grouping information of the STA group corresponding to each STA.

In one possible implementation of the fifth aspect, the transmitter is further configured to:

and after the processor acquires the load rate change information of the first STA, sending a fourth message to other member STAs except the first STA in the first STA group according to the grouping information, wherein the fourth message is used for indicating that the STA receiving the fourth message keeps in an active state.

In a possible implementation manner of the fifth aspect, the second message is further used to instruct the first STA to send an intra-group grant frame after the first STA finishes transmitting data in the first packet SP; the intra-group grant frame is used to instruct other member STAs in the first STA group except the first STA to access the channel within the remaining time of the first packet SP.

In one possible implementation of the fifth aspect, the AP further includes:

and the receiver is used for receiving a sixth message sent by the first STA, and the sixth message is used for the processor to determine the load rate change information.

In one possible implementation of the fifth aspect, the grouping information includes: group identification, STA identification of each member STA in the STA group, and channel access sequence of each member STA in the STA group.

In one possible embodiment of the fifth aspect, the allocation information comprises at least one of the following information: the group identification, the starting time of the group SP, the duration of the group SP and the type of the group SP, wherein the type of the group SP is used for indicating the channel access mode of each member STA in the STA group.

In a possible implementation manner of the fifth aspect, the channel access manner includes: and accessing the channels according to a preset sequence or a competition mode.

The beneficial effects of the AP provided by the fifth aspect and the possible embodiments of the fifth aspect may refer to the beneficial effects brought by the possible embodiments of the first aspect and the first aspect, and are not described herein again.

In a sixth aspect, the present invention provides a station STA, including:

the receiver is used for receiving a first message sent by an Access Point (AP), wherein the first message carries distribution information of a packet Service Period (SP) distributed by the AP to an STA group corresponding to the STA according to the load rate change information of the STA, and the positions of all member STAs in the STA group are adjacent;

a processor for accessing a channel within the packet SP according to the allocation information.

In a possible implementation manner of the sixth aspect, the STA group corresponding to the STA is at least one, and the receiver is specifically configured to:

In a possible implementation of the sixth aspect, the receiver is further configured to:

In one possible implementation of the sixth aspect, the STA further comprises:

a transmitter for transmitting an intra-group grant frame after transmitting data in the packet SP; the intra-group grant frame is used to instruct other member STAs in the group of STAs to access the channel for the remaining time of the group SP.

In one possible implementation of the sixth aspect, the transmitter is further configured to:

and before the receiver receives the second message sent by the AP, sending a sixth message to the AP, wherein the sixth message is used for determining the load rate change information by the AP.

In one possible implementation of the sixth aspect, the grouping information includes: group identification, STA identification of each member STA in the STA group, and channel access sequence of each member STA in the STA group.

In one possible implementation of the sixth aspect, the allocation information comprises at least one of the following information: the group identification, the starting time of the group SP, the duration of the group SP and the type of the group SP, wherein the type of the group SP is used for indicating the channel access mode of each member STA in the STA group.

In a possible implementation manner of the sixth aspect, the channel access manner includes: and accessing the channels according to a preset sequence or a competition mode.

The beneficial effects of the STA provided by the sixth aspect and the possible embodiments of the sixth aspect may refer to the beneficial effects brought by the possible embodiments of the first aspect and the first aspect, and are not described herein again.

In a seventh aspect, the present invention provides a channel access system, including: the access point AP provided in the third aspect and the station STA provided in the fourth aspect.

The beneficial effects of the channel access system provided in the seventh aspect may refer to the beneficial effects brought by the possible embodiments of the first aspect and the first aspect, and are not described herein again.

In an eighth aspect, the present invention provides a channel access system, including: the access point AP provided by the fifth aspect and the station STA provided by the sixth aspect.

The beneficial effects of the channel access system provided in the above eighth aspect may refer to the beneficial effects brought by the foregoing first aspect and various possible implementation manners of the first aspect, and are not described herein again.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of an application scenario of a channel access method provided in the present invention;

fig. 2 is a schematic diagram of a beacon interval structure;

fig. 3 is a flowchart illustrating a first embodiment of a channel access method according to the present invention;

fig. 4 is a schematic diagram illustrating a load rate change after two adjacent STAs monitor the same moving object sequentially;

FIG. 5 is a diagram illustrating a prior art data transmission schedule;

FIG. 6 is a schematic diagram of data transmission scheduling provided by the present invention;

fig. 7 is a flowchart illustrating a second channel access method according to an embodiment of the present invention;

fig. 8 is a diagram illustrating a format of a STA packet element;

fig. 9 is a diagram illustrating a format of the STA packet field in fig. 8;

fig. 10 is a diagram illustrating a format of the STA packet control field in fig. 9;

FIG. 11 is a diagram illustrating a format of a scheduling element;

FIG. 12 is a diagram illustrating the format of the fields allocated in FIG. 11;

FIG. 13 is a diagram illustrating a format of the allocation control field of FIG. 12;

FIG. 14 is a diagram illustrating the format of an intra-group grant frame;

FIG. 15 is a diagram illustrating the format of the control field of the packet SP in FIG. 14;

fig. 16 is a schematic structural diagram of a first AP according to the present invention;

fig. 17 is a schematic structural diagram of a STA according to a first embodiment of the present invention;

fig. 18 is a schematic structural diagram of a second AP embodiment provided in the present invention;

fig. 19 is a schematic structural diagram of a second STA embodiment according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical scheme of the embodiment of the invention can be applied to wireless video monitoring scenes, such as: other monitoring networks such as VPAN, the present invention may also be applied to other monitoring networks, and the present invention is not limited thereto. The embodiment of the present invention specifically takes a VPAN network as an example for exemplary explanation.

Fig. 1 is a schematic view of an application scenario of the channel access method provided by the present invention, as shown in fig. 1, a BSS of a VPAN is a star topology composed of an AP and a plurality of STAs, and is deployed along roads, building peripheries, indoor corridors, etc., and the AP and the STAs communicate with each other in a wireless manner. The AP is a central control and management device of a VPAN BSS, and periodically transmits a beacon frame to notify STAs of allocation information of various channel access periods (such as SP or contention periods) in a current beacon interval, receives video monitoring data of all STAs, and then transmits the received video data to an upper-layer user (a video monitoring center) of the VPAN network in a wireless or wired manner to form a video that can be displayed by the user; the STA is video monitoring terminal equipment of the VPAN and is responsible for acquiring video signals of a monitoring area, carrying out VBR coding to form video data, and then sending the video data to the AP through a wireless channel within allocated channel access time according to SP scheduled by the AP.

Fig. 2 is a schematic structural diagram of a Beacon Interval, and as shown in fig. 2, a Beacon Interval (BI) is divided into a Beacon Header Interval (BHI) and a Data Transfer Interval (DTI). BHI contains two types of access time: a Beacon Transmission Interval (BTI) for transmitting a Beacon frame; the other is an Announcement transmission interval (ATI for short) used for exchanging request frames or response frames between the AP and the STA, which may optionally occur. The DTI consists of several Contention-based Access periods (CBAP for short) (or denoted as Contention periods (CP for short)) and several scheduling-based service periods SP, which are data transmission periods; during CBAP, all STAs may contend for access to the channel, during SP, the owner STA of the SP may access the channel; the AP may inform the STA of allocation information about the DTI through a beacon frame or an announcement frame.

The technical scheme provided by the embodiment of the invention aims to solve the technical problems of prolonged transmission time and large power consumption when the AP allocates the SP for the STA in the prior art.

The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

Fig. 3 is a flowchart illustrating a first embodiment of a channel access method provided in the present invention, and as shown in fig. 3, the method provided in this embodiment includes the following steps:

s101, the AP acquires load rate change information of the first STA.

When a monitored picture of an STA changes (for example, a moving object enters the monitored picture), a burst data stream is generated, and a load rate of the STA is greatly higher than an average load rate when the monitored picture is stable, that is, the load rate of the STA changes significantly, where the load rate refers to an output data rate of a video encoder of the STA, that is, a rate at which video data after video encoding reaches an STA MAC layer Service Access Point (SAP), and is in units of bits/second. Specifically, the AP may actively detect the load rate of the STA to obtain the load rate change information of the STA according to the rate of the data frame sent by the STA and/or the detected data amount change rate in the buffer of the STA, or may determine the load rate change information of the STA according to a message (e.g., a moving object report message) reported by the STA. Generally, if a STA reports a moving object report message, the loading rate of the STA will increase greatly.

It should be noted that, in order to more clearly describe the technical solution of the present invention, in this embodiment, the first STA is used to represent an STA whose load rate changes, and the first STA may be any one of all STAs controlled by the AP, and is not specifically referred to a specific STA.

S102, the AP sends a first message to each member STA in the STA group corresponding to the first STA according to the load rate change information, wherein the first message carries the distribution information of the grouping SP distributed by the AP for the STA group corresponding to the first STA.

The allocation information is used for indicating each member STA in the STA group to access the channel according to the allocation information, and the positions of the member STAs in the STA group are adjacent.

Specifically, in this embodiment, the AP groups the STAs according to the adjacent relationship of the geographical locations of the STAs, the geographical locations of the member STAs in each STA group are adjacent, and the number of the STA groups corresponding to each STA may be one or more. When the AP determines that the load rate of the first STA changes, the AP may send a first message to each member in the STA group corresponding to the first STA through a beacon frame or an announcement frame, and allocate a packet SP to the STA group corresponding to the first STA, so that each member in the STA group may access a channel in the packet SP.

S103, the first STA receives a first message sent by the AP.

And S104, the first STA accesses the channel in the packet SP according to the distribution information.

Specifically, after receiving the allocation information of the packet SP sent by the AP, the first STA may obtain a channel access time period of the packet SP according to the allocation information, and send a data frame to the AP in a time period when the start time of the packet SP arrives, where the time period is a priority or contention for accessing a channel.

The technical scheme of the present invention is described in detail below by taking an example that a first STA monitors a moving object and the first STA is adjacent to a second STA.

Fig. 4 is a schematic diagram of load rate changes after two adjacent STAs monitor the same moving object sequentially. As shown in fig. 4, when the first STA detects a moving object, the load rate thereof is rapidly increased from the steady state and then decreased to the steady state; the load rate change of the second STA is similar to that of the first STA, and the second STA and the first STA exhibit a trade-off relationship in load rate due to the fact that a moving object enters the monitoring range of the second STA from the monitoring range of the first STA.

In the prior art, after a first STA monitors a moving object, although an AP can detect a load rate change condition of the first STA, a detection result has hysteresis, and the load rate of the first STA changes violently, and the AP cannot accurately predict a real-time load of the first STA, so that the SP allocated by the AP to the first STA may have the following two conditions: first, as shown in fig. 5, if the SP is too short, the buffered data that is not transmitted by the first STA must wait until the next TXOP (e.g., SP or CBAP broadcasting AID) that can access the channel can be transmitted by dynamic allocation of the AP, so that a delay T1 caused by waiting for the next TXOP and a delay T2 caused by polling or contention for accessing the channel at the next TXOP cannot meet the real-time communication requirement; secondly, if the SP is too long, the remaining time needs to be reallocated, so that all other STAs with communication requirements need to keep a monitoring state during the SP, which is not favorable for energy saving of all other STAs with communication requirements; in a wireless video monitoring network, the STA is powered by a battery, and energy conservation is a key aspect for keeping the STA working effectively.

In this embodiment, the members in the STA group corresponding to the first STA may be the first STA and the second STA that are adjacent to each other, and after the first STA monitors the moving object, as shown in fig. 6, the AP may allocate a longer packet SP (packet SP1) to the STA group corresponding to the first STA, so that the first STA sends all load data that has entered the cache in real time, and avoids the delay caused by waiting and polling/contention; and meanwhile, only the second STA with potential high load is allowed to keep a monitoring state, and after the first STA finishes sending data, the remaining time is directionally distributed to the second STA, so that the monitoring energy consumption generated by monitoring the SP for accessing the channel by other STAs in the remaining time of the SP is reduced. That is, in the technical solution provided in this embodiment, the AP may directly allocate a longer packet SP to multiple adjacent STAs (the first STA and the second STA) without accurately predicting the real-time load of the first STA, so as to implement energy saving of multiple other STAs in the BSS while meeting the real-time communication requirement of the first STA.

It should be noted that, for convenience of description, fig. 5 and 6 illustrate an SP for broadcasting AID by TXOP.

In addition, in this embodiment, in order to enable the packet SP to meet the communication requirement of the first STA with a rapidly increasing load, the AP should allocate a longer duration to the packet SP so that the packet SP can at least meet the real-time communication requirement of the first STA, where the meeting of the real-time communication requirement of the first STA means that the first STA can finish sending the data frame in the buffer; and the time extension of the packet SP compared to the original SP of the first STA (i.e., the SP corresponding to a single first STA) may be from the channel time of the SP or contention period CBAP originally (e.g., within the above BI) allocated as the broadcast AID. In specific allocation, for example, the duration of one packet SP allocated by the AP to the first STA and the second STA is T_GroupThe average time length of the single SP of the first STA in the last BI is T_STAThen T can be made_Group/T_STAN, where N is a positive integer greater than 1, i.e., the AP allocates N times the SP average duration of the first STA; alternatively, the AP may cause T to be based on the average load rate of the first STA during periods when no moving object is monitored S1, the historical peak load rate of the first STA S2_Group/T_STA＝S2/S1。

After the first STA finishes sending data, the packet SP is truncated, and the remaining time is released to other members in the group (such as the second STA mentioned above), so that the packet SP is no longer truncated again by the last owner STA (the second STA in this embodiment) and causes overhead, the duration of the packet SP should be controlled to not only meet the real-time high-load requirement of the first STA, but also not completely meet the communication requirement of the subsequent owner (the second STA) of the packet SP.

In the channel access method provided in this embodiment, the AP sends a first message to each member STA in the STA group corresponding to the first STA according to the obtained load rate change information, and instructs each member STA in the STA group to access the channel in the group SP allocated by the AP to the STA group corresponding to the first STA, where the geographical locations of each member STA in the STA group are adjacent, therefore, when the monitoring picture of the first STA changes and the load rate changes, the AP does not need to accurately predict the real-time load of the first STA, but may directly allocate a longer packet SP to the group of STAs to which the first STA corresponds, so that the first STA transmits all the payload data that has entered the buffer in the packet SP in real time, and directionally allocates the remaining time to other members in the group of STAs with potentially high payload, therefore, the real-time communication requirement of the first STA is met, and the monitoring energy consumption of other STAs outside the STA group caused by the need of monitoring the broadcast SP is saved.

Fig. 7 is a flowchart illustrating a second embodiment of a channel access method according to the present invention, which is a further optimized supplement to the embodiment shown in fig. 3. On the basis of the embodiment shown in fig. 3, as shown in fig. 7, the method provided by this embodiment includes the following steps:

s201, the AP acquires the adjacent relation of each STA, and sends a third message to each STA according to the adjacent relation, wherein the third message carries grouping information of the STA group corresponding to each STA.

Wherein, the grouping information may include: group identification, STA identification of each member STA in the STA group, and channel access sequence of each member STA in the STA group. The STA identifier may be a Media Access Control (MAC) address of the STA or an Association Identifier (AID) of the STA, where the length of the AID is usually smaller than the length of the MAC address. In addition, the neighbor relation refers to a neighbor relation of STAs in geographical positions, for example, as shown in fig. 1, STA1 is adjacent to STA2, STA2 is adjacent to STA3, STA5 is adjacent to STA4 and STA6, and the like.

Specifically, the VPAN is deployed according to the serial number sequence of the STAs, the AP may obtain, from the video monitoring center, a correspondence between the serial number of the STA and the MAC address thereof and an adjacent relationship between the STAs represented by the serial number of the STA, and the AP stores the correspondence between the MAC address of the STA and the AID, so that the AP may obtain the adjacent relationship between the STAs represented by the AID of the STA. The AP may group STAs according to their neighboring relationship, where the number of members in the group of STAs is related to the neighboring STA load change correlation. For example, STA1 is strongly correlated with the load variations of STA2, and only weakly correlated with STA3, and only STA1 and STA2 are grouped together. Wherein, the strong correlation of the load change means that when the load rate of the STA1 changes from high to low, the load rate of the STA2 changes from low to high (see fig. 4). The STA groups corresponding to the STAs are adjacent to each other in position, which means that the load change of the STA groups corresponding to the STAs is strongly correlated.

In this embodiment, the AP may send the third message through a beacon frame or an announcement frame, and specifically, the AP may add an STA packet element in the beacon frame or the announcement frame to inform each STA of the packet information. After receiving the plurality of STA grouping elements, the STA stores the grouping information related to the STA in the STA grouping information.

Fig. 8 is a schematic format diagram of an STA packet element, and as shown in fig. 8, the STA packet element includes: element ID, length, and several STA packet fields. Wherein, the element ID field indicates the number of the STA grouping element, the length field indicates the length of the STA grouping element, both can be represented by 1 octet, and the details about the number of bits occupied by the field in the subsequent figures are not described; the STA grouping field indicates the grouping condition of the STA group, and the specific format is shown in fig. 9 and 10.

As shown in fig. 9, the STA packet field includes: the STA group control field and a plurality of AID fields, wherein the AID fields indicate STA identifications of member STAs in the STA group; the STA packet control field is shown in fig. 10 and includes: a Group ID field and a number of STAs field. Wherein, the Group ID is a Group identifier, similar to the STA AID; the STA number field indicates the number of STAs in the STA group classified into the current GroupID, which is the same as the AID field of the STA group field shown in fig. 9. In addition, the precedence order of the AIDs in fig. 9 may be used to indicate the channel access order of the STAs in the STA group, as in fig. 9, the STAs access the channel in the order from the AID1 to the AID n.

It should be noted that the formats shown in fig. 8-10 are only an exemplary illustration and are not intended to limit the present invention, and the following figures related to the element formats are similar.

In addition, in this embodiment, when the AP performs STA grouping, the grouping information includes the channel access sequence of each member in the STA group, so that the time delay caused by contention access of each member in the STA group can be reduced, and the real-time performance of STA transmission is further improved. Correspondingly, each STA corresponds to at least one STA group.

And S202, the first STA receives a third message sent by the AP.

Specifically, after receiving the packet information carried in the third message sent by the AP, the first STA stores the packet information related to itself (i.e., the STA group corresponding to the first STA) in the STA packet information.

S203, the first STA sends a sixth message to the AP.

Specifically, the first STA may detect a moving object according to VBR coding, and after the first STA detects the moving object, may send a message (i.e., a sixth message) to the AP, where the message may specifically be a moving object report message, and may be sent to the AP in a control frame or a management frame (e.g., an information response frame).

In the above embodiment, the AP may determine the load rate change information by actively detecting the load rate change condition of the first STA or receiving a moving object report message, and because a result of the active detection of the AP has hysteresis, in this embodiment, the moving object report message is used to determine the load rate change information in real time, so as to ensure that the AP distributes the packet SP to the first STA in time.

And S204, the AP receives a sixth message sent by the first STA.

S205, the AP sends a second message to each member STA in the first STA group corresponding to the first STA according to the sixth message, where the second message carries allocation information of the first packet SP allocated by the AP to the first STA group corresponding to the first STA.

As described in step S201 above, the number of the STA groups corresponding to the first STA is at least one; in this embodiment, after receiving the report message of the moving object, the AP sends the allocation information of the first packet SP to each member STA in the first STA group corresponding to the first STA, where the first STA group is an STA group in which the first STA in the STA group corresponding to the first STA can first access the channel, so as to ensure that the first STA with a higher communication demand accesses the channel as soon as possible, and reduce the time delay caused by contention.

Specifically, the allocation information includes at least one of the following information: the group identifier, the start time of the group SP, the duration of the group SP, and the group SP type, where the group SP type is used to indicate a channel access manner of each member STA in the STA group, and the channel access manner may include: and accessing the channels according to a preset sequence or a competition mode. When the AP allocates the first group of STAs with the first group of SPs, the second message may be sent to each member in the first group of STAs through a beacon frame or a notification frame, and more specifically, the AP may notify each member in the first group of STAs of the allocation information of the first group of SPs through a scheduling element in the beacon frame or the notification frame.

Fig. 11 is a schematic format diagram of a scheduling element, and as shown in fig. 11, the scheduling element includes: element ID, length, and several assignment fields; wherein, the element ID field and the length field are similar to the element ID field and the length field in the above-mentioned grouping element, and the allocation field indicates allocation information of SPs (including grouping SPs), and the specific format thereof can be seen in fig. 12.

As shown in fig. 12, the allocation field specifically includes: an assignment control field, a source AID field, a destination AID field, an assignment start time field, an assignment duration field. Wherein, the source AID field indicates the address of the data sender communicating in the allocated SP, for example, a Group ID may be identified for the Group of the STA Group; the destination AID field indicates the address of the data recipient communicating within the assigned SP, which may be, for example, the identity of the AP; the allocation start time field and the allocation duration field indicate the channel access period of the packet SP.

As shown in fig. 13, the allocation control field specifically includes: an assignment ID, assignment type field, wherein the assignment ID field indicates the number of assigned SPs; the allocation type field indicates a channel access mode of the allocated SP, for example, the allocation type may be a packet SP type in the allocation information, and possible values of the allocation type field may be as shown in table 1.

Table 1 assigning type field values

Wherein, SP allocation, CBAP allocation and Dynamic SP (DSP for short) allocation are consistent with the prior art. The group SP (type 1) may indicate that the channel access mode is a group SP accessing the channel in a preset order, that is, other member STAs in the STA group except the STA accessing the channel first access the channel in the remaining time of the group SP (type 2) according to the preset order indicated by the STA group element; the packet SP (type 2) may indicate a packet SP whose channel access manner is to access the channel in a contention manner, i.e., other member STAs within the group of STAs except the STA which first accesses the channel access the channel in a contention manner for the remaining time of the packet SP (type 2). When the packet type is a packet SP (type 2), the number of members in the STA group is at least three. The packet SP can only be used by STAs within the group of owner STAs of the packet SP, either according to type 1 or type 2, unless the STA that is a member of the group issues a grant frame to free up the remaining time of the packet SP.

Taking the example that one group of STAs includes three members (STA1, STA2, STA3), the use of two SP types, type 1 and type 2, may follow the following criteria: type 1 is used if the AP can accurately predict the load change order of STAs in the group of STAs, otherwise type 2 is used. For example, STA1, STA2, and STA3 are deployed on a single road without an intersection, and when STA1 monitors a moving object, the moving object appears in the monitoring range of STA2 and STA3 with high probability, the AP allocates group SPs of type 1 to STA1, STA2, and STA 3; if the STA1, the STA2 and the STA3 are deployed around the intersection, and the AP cannot predict whether a moving object appears in the monitoring range of the STA2 or the STA3 after the STA1 monitors the moving object, the AP allocates the group SP of type 2 to the STA1, the STA2 and the STA 3.

The above format of the schedule element is only an exemplary illustration, and other fields may be included in the schedule element, which will not be described in detail herein.

In addition, it should be noted that, when the AP receives a report message of a moving object reported by multiple STAs in a certain BI, the AP allocates an independent packet SP to the multiple STAs, so that the STAs fairly use the packet SP, and a situation that the packet SP is always continuously and preferentially occupied by the STA in the front of the access channel sequence and the STA in the back of the access channel sequence cannot share the channel time is avoided. For example: a plurality of moving objects continuously enter the monitoring ranges of the STA1, STA2 and STA3 which are adjacent in sequence in the same direction, and the AP receives the STA1 and the moving object report message reported by the STA2 in a certain BI at the same time, so that a group SP can be allocated to each of an STA group (STA1, STA2) of an STA1 corresponding to the STA1 and an STA group (STA2, STA3) of an STA2 corresponding to the STA2, which can access the channel first, so as to prevent the STA1 from keeping high load and continuously squeezing the channel time of the STA2 and the STA 3.

S206, the AP sends a fourth message to other member STAs except the first STA in the first STA group according to the grouping information.

Specifically, after receiving the moving object report message, the AP may send a fourth message to other member STAs in the first STA group except the first STA, indicating that the other member STAs keep active, so that STAs adjacent to the first STA start to try to access the channel at the first time after the first STA finishes transmitting data and after each STA monitors the moving object, thereby reducing a delay caused by that high-priority data of the moving object monitored cannot be sent immediately due to hibernation.

For convenience of description, in this embodiment, except for special description, the first STA group includes a first STA and a second STA for example, and in this step, other member STAs except the first STA in the first STA group are the second STA.

In this embodiment, the fourth message may be sent to the second STA in a broadcast form after the AP obtains the control right, or sent to the second STA in an acknowledgement frame.

Note that there is no strict timing relationship between step S206 and step S207, and the transmission may be performed before the second STA accesses the channel.

And S207, the first STA receives a second message sent by the AP.

S208, the first STA accesses the channel within the first packet SP according to the allocation information of the first packet SP.

Specifically, after receiving the allocation information of the first packet SP carried in the second message, the first STA accesses the channel in the time period corresponding to the first packet SP according to the start time of the packet SP and the duration of the packet SP in the allocation information.

S209, after the first STA finishes transmitting data in the first packet SP, the first STA sends an intra-packet grant frame.

Specifically, after the first STA finishes transmitting data in the first packet SP, if there is remaining time, the first STA may send an intra-group grant frame to other member STAs in the group to indicate the other member STAs to access the channel.

Fig. 14 is a schematic diagram of a format of an intra-group grant frame, and as shown in fig. 14, the intra-group grant frame includes: frame control, duration, receive address RA, transmit address TA, packet SP control, and frame check sequence fields. Wherein, the meanings of the frame control, the duration and the frame check sequence field are the same as the meanings of the corresponding field in the frame granted in the VPAN standard, and are not repeated here; the RA field indicates the MAC address of the receiving STA, which may be set as a broadcast address when it is desired to transmit to more than 1 destination STA, where only other STAs in the group that have not accessed the channel should receive the intra-group grant frame; the TA field indicates the MAC address of the transmitting STA (e.g., the first STA); the specific format of the packet SP control field can be seen in fig. 15.

As shown in fig. 15, the packet SP control field specifically includes: remaining time type, remaining time length, and reservation. When the remaining time type field is set to 0, the remaining time type is a packet SP, and when the remaining time type field is other values, the remaining time type is a contention period; the remaining time length field indicates the length of time remaining for the packet SP in units of 8 microseconds.

Taking the example that in step S205, one STA group includes three members (STA1, STA2, STA3), if the packet SP is type 1, after STA1 finishes transmitting data, if there is remaining time, an intra-group grant frame is transmitted to STA2, wherein an RA field of the intra-group grant frame is set to the MAC address of STA2, a TA field is set to the MAC address of STA1, and the remaining time type field is set to 0; after the STA2 finishes sending data, if there is remaining time, sending an intra-group grant frame to the STA3, wherein an RA field of the intra-group grant frame is set to be a MAC address of the STA3, a TA field is set to be a MAC address of the STA2, and a remaining time type field is set to be 0; after STA3 finishes transmitting data, if there is time left, it transmits a grant frame in broadcast form to indicate that all STAs can contend for access. If the packet SP is type 2, after the STA1 finishes transmitting data, if there is remaining time, it transmits an intra-group grant frame to the STA2 and the STA3, where an RA field of the intra-group grant frame is set to a broadcast address, a TA field is set to a MAC address of the STA1, and the remaining time type field is set to non-0.

And S210, after the preset time, the AP sends a fifth message to each member STA in a second STA group corresponding to a second STA in the STA group, wherein the fifth message carries the distribution information of a second packet SP distributed by the AP for the second STA group corresponding to the second STA.

The second STA group is an STA group in which the second STA in the STA group corresponding to the second STA can first access the channel.

In this embodiment, after receiving the moving object report message sent by the STA, the AP allocates the packet SP to the STA, that is, after receiving the moving object report message sent by the second STA, the AP allocates the packet SP to the second STA. As shown in fig. 4, the load rates of the first STA and the second STA have a trade-off relationship, and after the AP receives the report message of the moving object sent by the first STA, it can be predicted that the neighboring STA (the second STA) of the first STA also monitors that the moving object is a high-probability event, so the AP can allocate channel time to the second STA in advance.

Specifically, the AP may predict, according to historical experience, a time when the second STA monitors the moving object, and after receiving a moving object report message sent by the first STA for the first time, allocate, by the predicted preset time, a second packet SP to a second STA group corresponding to the second STA in advance, so that the second STA accesses the channel as soon as possible. For example, the AP may estimate a time interval in which the second STA monitors the moving object as the estimated preset time according to the moving rate of the moving object monitored by the second STA and the distance between the first STA and the second STA.

It should be noted that if the AP can accurately infer that the moving object is about to enter the second STA, a second packet SP may be allocated to the second group of STAs before the second STA reports the report message of the moving object; otherwise, the second packet SP may not be allocated in advance for the second group of STAs.

Compared with the prior art, in the embodiment, under the condition that the AP does not increase the overhead of the scheduling signaling, the channel time originally allocated as the broadcast address SP or the contention period is reallocated as the packet SP of the STA group, so that each STA in the STA group can flexibly extend the occupied SP time and flexibly cut off the SP according to the respective access sequence and load requirements, and the remaining SP time is allocated to other member STAs with high load at high probability in the group, so that other STAs outside the STA group do not need to keep monitoring in the packet SP, thereby saving energy. In this embodiment, the channel access mechanism for allocating the group SP to the STA group may ensure real-time transmission requirements of the STA that finds the video monitoring target (i.e., the first STA that accesses the channel in the group SP), and may also automatically complete time allocation of the group SP among the group members through the STA group, thereby saving polling overhead of the AP dynamically allocating the broadcast address SP, and reducing monitoring/contention energy consumption of a large number of other STAs due to monitoring the broadcast address SP or contention during the contention period.

Fig. 16 is a schematic structural diagram of an AP provided in the present invention, and as shown in fig. 16, an AP100 in this embodiment includes:

a processing module 110, configured to obtain load rate change information of a first station STA;

a sending module 120, configured to send a first message to each member STA in an STA group corresponding to the first STA according to the load rate change information, where the first message carries allocation information of a packet SP allocated by the AP to the STA group corresponding to the first STA; the first message is used for indicating each member STA in the STA group to access the channel in the grouping SP according to the distribution information, and the positions of the member STAs in the STA group are adjacent.

As a specific embodiment of the present invention, the first STA corresponds to at least one STA group, and the sending module 120 is specifically configured to: according to the load rate change information, sending a second message to each member STA in a first STA group corresponding to the first STA, wherein the second message carries distribution information of a first packet SP distributed by the AP for the first STA group corresponding to the first STA; the second message is used for indicating each member STA in the first STA group to access the channel in the first grouping SP according to the distribution information corresponding to the first grouping SP, and the first STA group is an STA group which can be accessed into the channel first by the first STA in the STA group corresponding to the first STA.

Further, the processing module 110 is further configured to: before obtaining the load rate change information of the STAs, the neighbor relation of each STA is obtained, and the sending module 120 is instructed to send a third message to each STA according to the neighbor relation, where the third message carries the grouping information of the STA group corresponding to each STA.

The sending module 120 is further configured to: after the processing module 110 obtains the load rate change information of the first STA, a fourth message is sent to other member STAs in the first STA group except the first STA according to the grouping information, where the fourth message is used to indicate that the STA receiving the fourth message keeps an active state.

In an embodiment of the present invention, the second message is further configured to instruct the first STA to send an intra-group grant frame after the first STA finishes transmitting data in the first packet SP; the intra-group grant frame is used to instruct other member STAs in the first STA group except the first STA to access the channel within the remaining time of the first packet SP.

The sending module 120 is further configured to: and after the preset time, sending a fifth message to each member STA in a second STA group corresponding to a second STA in the first STA group, wherein the fifth message carries the distribution information of a second sub-group SP distributed by the AP for the second STA group corresponding to the second STA, and the second STA group is an STA group which can be firstly accessed into a channel by the second STA in the STA group corresponding to the second STA.

Optionally, the AP further includes: a receiving module 130, configured to receive a sixth message sent by the first STA, where the sixth message is used by the processing module 110 to determine the load rate change information.

In this embodiment, the grouping information may include: group identification, STA identification of each member STA in the STA group, and channel access sequence of each member STA in the STA group.

The allocation information may include at least one of the following information: the group identification, the starting time of the group SP, the duration of the group SP and the type of the group SP, wherein the type of the group SP is used for indicating the channel access mode of each member STA in the STA group.

The channel access mode may include: and accessing the channels according to a preset sequence or a competition mode.

The AP provided in the embodiment of the present invention may execute the above method embodiment, and its implementation principle and technical effect are similar, which are not described herein again.

Fig. 17 is a schematic structural diagram of an STA according to the present invention, and as shown in fig. 17, an STA200 in this embodiment includes:

a receiving module 210, configured to receive a first message sent by an AP, where the first message carries allocation information of a group SP allocated by the AP to an STA group corresponding to the STA according to load rate change information of the STA, and the STA groups are adjacent to each other in position;

a processing module 220, configured to access the channel within the packet SP according to the allocation information.

As a specific embodiment of the present invention, the number of STA groups corresponding to an STA is at least one, and the receiving module 210 is specifically configured to: and receiving a second message sent by the AP, wherein the second message carries allocation information of a first packet SP allocated by the AP to a first STA group corresponding to the STA according to the load rate change information of the STA, and the first STA group is an STA group which can be accessed into a channel firstly by the STA in the STA group corresponding to the STA.

Further, the receiving module 210 is further configured to: before receiving the distribution information of the grouping SP sent by the AP, receiving a third message sent by the AP, wherein the third message carries the grouping information of the STA group corresponding to the STA, and the grouping information is determined by the AP according to the acquired adjacent relation of the STAs.

In an embodiment of the present invention, the receiving module 210 is further configured to: and receiving a fourth message sent by the AP, wherein the fourth message is used for indicating the STA to keep in an active state, and the fourth message is sent when the AP allocates a packet SP for other STA groups except the STA group in the STA group corresponding to the STA.

As an optional embodiment of the present invention, the STA further includes:

a sending module 230, configured to send an intra-group grant frame after data transmission in the group SP is completed; the intra-group grant frame is used to instruct other member STAs in the group of STAs to access the channel for the remaining time of the group SP.

Optionally, the receiving module 210 is further configured to: and receiving a fifth message sent by the AP, wherein the fifth message carries allocation information of a second packet SP allocated by the AP for a second STA group corresponding to the second STA, and the allocation information of the second packet SP is sent after the AP allocates the packet SP for other STA groups except the STA group in the STA group corresponding to the STA, and the packet SP is sent after a preset time.

The sending module 230 is further configured to: before the receiving module 210 receives the second message sent by the AP, a sixth message is sent to the AP, where the sixth message is used for the AP to determine the load rate change information.

The STA provided in the embodiment of the present invention may execute the above method embodiment, and its implementation principle and technical effect are similar, which are not described herein again.

Fig. 18 is a schematic structural diagram of a second AP embodiment provided in the present invention, and as shown in fig. 18, an AP300 in the present embodiment includes:

a processor 310, configured to obtain load rate change information of a first station STA;

a transmitter 320, configured to send a first message to each member STA in an STA group corresponding to the first STA according to the load rate change information, where the first message carries allocation information of a packet SP allocated by the AP to the STA group corresponding to the first STA; the first message is used for indicating each member STA in the STA group to access the channel in the grouping SP according to the distribution information, and the positions of the member STAs in the STA group are adjacent.

As a specific embodiment of the present invention, the STA group corresponding to the first STA is at least one, and the transmitter 320 is specifically configured to: according to the load rate change information, sending a second message to each member STA in a first STA group corresponding to the first STA, wherein the second message carries distribution information of a first packet SP distributed by the AP for the first STA group corresponding to the first STA; the second message is used for indicating each member STA in the first STA group to access the channel in the first grouping SP according to the distribution information corresponding to the first grouping SP, and the first STA group is an STA group which can be accessed into the channel first by the first STA in the STA group corresponding to the first STA.

Further, the processor 310 is further configured to: before obtaining the load rate change information of the STAs, the neighbor relation of each STA is obtained, and the transmitter 320 is indicated to transmit a third message to each STA according to the neighbor relation, where the third message carries the grouping information of the STA group corresponding to each STA.

The transmitter 320 is further configured to: after the processor 310 acquires the load rate change information of the first STA, a fourth message is sent to other member STAs in the first STA group except the first STA according to the grouping information, and the fourth message is used for indicating that the STA receiving the fourth message keeps in an active state.

The transmitter 320 is further configured to: and after the preset time, sending a fifth message to each member STA in a second STA group corresponding to a second STA in the first STA group, wherein the fifth message carries the distribution information of a second sub-group SP distributed by the AP for the second STA group corresponding to the second STA, and the second STA group is an STA group which can be firstly accessed into a channel by the second STA in the STA group corresponding to the second STA.

Optionally, the AP300 further includes: a receiver 330, configured to receive a sixth message sent by the first STA, where the sixth message is used by the processor 310 to determine the load rate change information.

Fig. 19 is a schematic structural diagram of a second STA embodiment provided in the present invention, and as shown in fig. 19, an STA400 in the present embodiment includes:

a receiver 410, configured to receive a first message sent by an AP, where the first message carries allocation information of a group SP allocated by the AP to an STA group corresponding to the STA according to load rate change information of the STA, and where STAs in the STA group are adjacent;

a processor 420 for accessing the channel within the packet SP according to the allocation information.

As a specific embodiment of the present invention, the number of STA groups corresponding to an STA is at least one, and the receiver 410 is specifically configured to: and receiving a second message sent by the AP, wherein the second message carries allocation information of a first packet SP allocated by the AP to a first STA group corresponding to the STA according to the load rate change information of the STA, and the first STA group is an STA group which can be accessed into a channel firstly by the STA in the STA group corresponding to the STA.

Further, the receiver 410 is further configured to: before receiving the distribution information of the grouping SP sent by the AP, receiving a third message sent by the AP, wherein the third message carries the grouping information of the STA group corresponding to the STA, and the grouping information is determined by the AP according to the acquired adjacent relation of the STAs.

In an embodiment of the present invention, the receiver 410 is further configured to: and receiving a fourth message sent by the AP, wherein the fourth message is used for indicating the STA to keep in an active state, and the fourth message is sent when the AP allocates a packet SP for other STA groups except the STA group in the STA group corresponding to the STA.

As an optional embodiment of the present invention, the STA400 further includes:

a transmitter 430, configured to send an intra-group grant frame after the data is transmitted in the packet SP; the intra-group grant frame is used to instruct other member STAs in the group of STAs to access the channel for the remaining time of the group SP.

Optionally, the receiver 410 is further configured to: and receiving a fifth message sent by the AP, wherein the fifth message carries allocation information of a second packet SP allocated by the AP for a second STA group corresponding to the second STA, and the allocation information of the second packet SP is sent after the AP allocates the packet SP for other STA groups except the STA group in the STA group corresponding to the STA, and the packet SP is sent after a preset time.

The transmitter 430 is further configured to: before the receiver 410 receives the second message sent by the AP, a sixth message is sent to the AP, and the sixth message is used for the AP to determine the load rate change information.

An embodiment of the present invention provides a channel access system, including: the AP in the embodiment shown in fig. 16 and the STA in the embodiment shown in fig. 17 described above.

Specifically, at least one STA is provided, and the AP and the STAs form a star topology. The system can execute the method embodiments, and the implementation principle and the technical effect are similar, and are not described herein again.

An embodiment of the present invention further provides a channel access system, including: the AP in the embodiment shown in fig. 18 and the STA in the embodiment shown in fig. 19 described above.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for accessing a channel, comprising:

the method comprises the steps that an Access Point (AP) acquires load rate change information of a first STA;

the AP sends a first message to each member STA in the STA group corresponding to the first STA according to the load rate change information, wherein the first message carries distribution information of a packet service period SP distributed by the AP for the STA group corresponding to the first STA; the first message is used for indicating each member STA in the STA group to access a channel in the grouping SP according to the distribution information, the positions of the member STAs in the STA group are adjacent, and the load rate change information of each member in the STA group is correlated;

and when the AP determines that the load rate of the first STA changes, the AP sends a first message to each member in the STA group corresponding to the first STA.

2. The channel access method according to claim 1, wherein the number of the STA groups corresponding to the first STA is at least one, and the AP sends the first message to each member STA in the STA group corresponding to the STA according to the load rate change information, specifically including:

the AP sends a second message to each member STA in a first STA group corresponding to the first STA according to the load rate change information, wherein the second message carries distribution information of a first group SP distributed by the AP for the first STA group corresponding to the first STA; the second message is used for indicating each member STA in the first STA group to access a channel in the first SP according to the distribution information corresponding to the first SP, and the first STA group is an STA group which can be accessed to the channel first by the first STA in the STA group corresponding to the first STA.

3. The channel access method according to claim 2, wherein before the AP acquires the load rate change information of the STA, the method further comprises:

and the AP acquires the adjacent relation of each STA and sends a third message to each STA according to the adjacent relation, wherein the third message carries the grouping information of the STA group corresponding to each STA.

4. The channel access method of claim 3, wherein after the AP obtains the load rate change information of the first STA, the method further comprises:

5. The channel access method according to any of claims 2-4, wherein the second message is further used for instructing the first STA to send an intra-group grant frame after the first packet SP has transmitted data; the intra-group grant frame is used for indicating other member STAs in the first STA group except the first STA to access a channel within the remaining time of the first packet SP.

6. The channel access method according to any one of claims 2-4, wherein the method further comprises:

after a preset time, the AP sends a fifth message to each member STA in a second STA group corresponding to a second STA in the first STA group, where the fifth message carries allocation information of a second packet SP allocated by the AP to the second STA group corresponding to the second STA, and the second STA group is an STA group in the STA group corresponding to the second STA, where the second STA can first access a channel.

7. The channel access method according to any of claims 1 to 4, wherein the obtaining, by the AP, load rate change information of the first STA specifically comprises:

and the AP receives a sixth message sent by the first STA, wherein the sixth message is used for the AP to determine the load rate change information.

8. The channel access method according to claim 3 or 4, wherein the grouping information comprises: group identification, STA identification of each member STA in the STA group, and channel access sequence of each member STA in the STA group.

9. The channel access method according to any of claims 1-4, wherein the allocation information comprises at least one of the following information: the STA group comprises a group identifier, the starting time of a group SP, the duration of the group SP and a group SP type, wherein the group SP type is used for indicating the channel access mode of each member STA in the STA group.

10. The channel access method according to claim 9, wherein the channel access mode comprises: and accessing the channels according to a preset sequence or a competition mode.

11. A method for accessing a channel, comprising:

a first STA receives a first message sent by an Access Point (AP), wherein the first message carries distribution information of a packet Service Period (SP) distributed by the AP to an STA group corresponding to the first STA according to load rate change information, the positions of all members (STA) in the STA group are adjacent, and the load rate change information of all members in the STA group is correlated with each other;

the first STA accesses a channel in the grouping SP according to the distribution information;

12. The channel access method according to claim 11, wherein the STA group corresponding to the first STA is at least one, and the first STA receives a first message of a packet service period SP sent by an AP, and specifically includes:

and the first STA receives a second message sent by the AP, wherein the second message carries allocation information of a first packet SP allocated by the AP to a first STA group corresponding to the first STA according to the load rate change information, and the first STA group is an STA group which can be accessed into a channel first by the first STA in the STA group corresponding to the first STA.

13. The channel access method according to claim 12, wherein before the first STA receives the allocation information of the first packet SP transmitted by the AP, the method further comprises:

and the first STA receives a third message sent by the AP, wherein the third message carries grouping information of an STA group corresponding to the first STA, and the grouping information is determined by the AP according to the acquired adjacent relation of the STAs.

14. The channel access method according to claim 12 or 13, wherein the method further comprises:

the first STA receives a fourth message sent by the AP, wherein the fourth message is used for indicating the STA to keep in an active state, and the fourth message is sent when the AP allocates a group SP for other STA groups except the first STA group in the STA group corresponding to the first STA.

15. The channel access method according to claim 12 or 13, wherein the method further comprises:

after the first STA finishes transmitting data in the first packet SP, sending an intra-packet grant frame; the intra-group grant frame is used for indicating other member STAs in the first STA group except the first STA to access a channel within the remaining time of the first packet SP.

16. The channel access method according to claim 12 or 13, wherein the method further comprises:

the first STA receives a fifth message sent by the AP, the fifth message carries allocation information of a second packet SP allocated by the AP to a second STA group corresponding to the second STA, and the fifth message is sent after the AP allocates the packet SP to other STA groups except the first STA group in the STA group corresponding to the first STA, and the packet SP is transmitted after a preset time.

17. The channel access method according to any of claims 11-13, wherein before the first STA receives the allocation information of the packet SP transmitted by the AP, the method further comprises:

the first STA sending a sixth message to the AP, the sixth message for the AP to determine the load rate change information.

18. The channel access method of claim 13, wherein the grouping information comprises: group identification, STA identification of each member STA in the STA group, and channel access sequence of each member STA in the STA group.

19. The channel access method according to any of claims 11-13, wherein the allocation information comprises at least one of the following information: the STA group comprises a group identifier, the starting time of a group SP, the duration of the group SP and a group SP type, wherein the group SP type is used for indicating the channel access mode of each member STA in the STA group.

20. The channel access method of claim 19, wherein the channel access mode comprises: and accessing the channels according to a preset sequence or a competition mode.

21. An access point, AP, comprising:

the processing module is used for acquiring load rate change information of the first STA;

a sending module, configured to send a first message to each member STA in an STA group corresponding to the first STA according to the load rate change information, where the first message carries allocation information of a packet service period SP allocated by the AP to the STA group corresponding to the first STA; the first message is used for indicating each member STA in the STA group to access a channel in the grouping SP according to the distribution information, the positions of the member STAs in the STA group are adjacent, and the load rate change information of each member in the STA group is correlated; and when the AP determines that the load rate of the first STA changes, the AP sends a first message to each member in the STA group corresponding to the first STA.

22. The AP of claim 21, wherein the first STA corresponds to at least one STA group, and wherein the sending module is specifically configured to:

sending a second message to each member STA in a first STA group corresponding to the first STA according to the load rate change information, wherein the second message carries distribution information of a first packet SP distributed by the AP for the first STA group corresponding to the first STA; the second message is used for indicating each member STA in the first STA group to access a channel in the first SP according to the distribution information corresponding to the first SP, and the first STA group is an STA group which can be accessed to the channel first by the first STA in the STA group corresponding to the first STA.

23. The AP of claim 22, wherein the processing module is further configured to:

before obtaining the load rate change information of the STA, obtaining the adjacent relation of each STA, and instructing the sending module to send a third message to each STA according to the adjacent relation, wherein the third message carries the grouping information of the STA group corresponding to each STA.

24. The AP of claim 23, wherein the sending module is further configured to:

after the processing module acquires load rate change information of a first STA, according to the grouping information, sending a fourth message to other member STAs except the first STA in the first STA group, wherein the fourth message is used for indicating the STAs receiving the fourth message to keep in an active state.

25. The AP of claim 22 or 23, wherein the second message is further used to instruct the first STA to send an intra-group grant frame after the first packet SP has transmitted data; the intra-group grant frame is used for indicating other member STAs in the first STA group except the first STA to access a channel within the remaining time of the first packet SP.

26. The AP of claim 22 or 23, wherein the sending module is further configured to:

and after preset time, sending a fifth message to each member STA in a second STA group corresponding to a second STA in the first STA group, wherein the fifth message carries allocation information of a second sub-group SP allocated by the AP for the second STA group corresponding to the second STA, and the second STA group is an STA group which can be firstly accessed into a channel by the second STA in the STA group corresponding to the second STA.

27. The AP of any one of claims 21-23, further comprising:

a receiving module, configured to receive a sixth message sent by the first STA, where the sixth message is used by the processing module to determine the load rate change information.

28. The AP of claim 23, wherein the grouping information comprises: group identification, STA identification of each member STA in the STA group, and channel access sequence of each member STA in the STA group.

29. The AP of any of claims 21-23, wherein the allocation information comprises at least one of: the STA group comprises a group identifier, the starting time of a group SP, the duration of the group SP and a group SP type, wherein the group SP type is used for indicating the channel access mode of each member STA in the STA group.

30. The AP of claim 29, wherein the channel access mode comprises: and accessing the channels according to a preset sequence or a competition mode.

31. A Station (STA), comprising:

a receiving module, configured to receive a first message sent by an access point AP, where the first message carries allocation information of a packet service period SP allocated by the AP to an STA group corresponding to the STA according to load rate change information of the STA, where STAs of the STA group are adjacent in position, the load rate change information of the STAs in the STA group is correlated with each other, and when the AP determines that a load rate of a first STA changes, the AP sends the first message to each member in the STA group corresponding to the first STA;

and the processing module is used for accessing a channel in the grouping SP according to the distribution information.

32. The STA of claim 31, wherein the STA corresponds to at least one STA group, and wherein the receiving module is specifically configured to:

and receiving a second message sent by the AP, where the second message carries allocation information of a first packet SP allocated by the AP to a first STA group corresponding to the STA according to the load rate change information of the STA, and the first STA group is an STA group in the STA group corresponding to the STA, where the STA can first access a channel.

33. The STA of claim 32, wherein the receiving module is further configured to:

before receiving allocation information of a packet SP sent by the AP, receiving a third message sent by the AP, wherein the third message carries packet information of an STA group corresponding to the STA, and the packet information is determined by the AP according to the acquired adjacent relation of the STAs.

34. The STA of claim 32 or 33, wherein the receiving module is further configured to:

receiving a fourth message sent by the AP, where the fourth message is used to indicate that a STA keeps an active state, and the fourth message is sent by the AP when a packet SP is allocated to other STA groups except the STA group in the STA group corresponding to the STA.

35. The STA of claim 32 or 33, wherein the STA further comprises:

a sending module, configured to send an intra-group grant frame after data is transmitted in the group SP; the intra-group grant frame is used for indicating other member STAs in the STA group except the STA to access the channel within the remaining time of the group SP.

36. The STA of claim 32 or 33, wherein the receiving module is further configured to:

and receiving a fifth message sent by the AP, where the fifth message carries allocation information of a second packet SP allocated by the AP for a second STA group corresponding to a second STA, and the fifth message is sent after a preset time elapses after the AP allocates the packet SP for other STA groups except the STA group in the STA group corresponding to the STA.

37. The STA of claim 35, wherein the transmitting module is further configured to:

before the receiving module receives the second message sent by the AP, sending a sixth message to the AP, where the sixth message is used for the AP to determine the load rate change information.

38. The STA of claim 33, wherein the grouping information comprises: group identification, STA identification of each member STA in the STA group, and channel access sequence of each member STA in the STA group.

39. The STA of any of claims 31-33, wherein the allocation information comprises at least one of: the STA group comprises a group identifier, the starting time of a group SP, the duration of the group SP and a group SP type, wherein the group SP type is used for indicating the channel access mode of each member STA in the STA group.

40. The STA of claim 39, wherein the channel access mode comprises: and accessing the channels according to a preset sequence or a competition mode.

41. A channel access system, comprising: an access point AP according to any of claims 21 to 30 and a station STA according to any of claims 31 to 40.