WO2013139213A1

WO2013139213A1 - Transmission method for release channel access indication information and station device

Info

Publication number: WO2013139213A1
Application number: PCT/CN2013/072441
Authority: WO
Inventors: 田开波; 邢卫民; 李楠; 韩志强; 吕开颖
Original assignee: 中兴通讯股份有限公司
Priority date: 2012-03-20
Filing date: 2013-03-12
Publication date: 2013-09-26
Also published as: CN103326838B; CN103326838A

Abstract

A transmission method for release channel access indication information and a station device belong to the joint field of computer networks and wireless communications. The transmission method for release channel access indication information comprises: a sending station sending out a wireless frame, the signalling domain of the physical-layer frame header of the wireless frame carrying release channel access indication information; and a receiving station receiving the wireless frame and resetting a network allocation vector (NAV) of the station. Also disclosed is a corresponding station device. The technical solution of the present application effectively reduces the transmission load overhead and reduces the power consumption while ensuring that a release channel indication function is completed. In addition, a physical-layer signalling usually adopts the most reliable modulation encoding solution, and a function indication is placed in the physical-layer signalling to be transmitted, thereby being able to increase the transmission reliability.

Description

Method for transmitting channel access indication information and site device

Technical field

The invention belongs to the field of intersection of computer network and wireless communication, and particularly relates to an implementation scheme for releasing channel access. Background technique

Currently, in the field of wireless networks, wireless local area networks (WLANs) are rapidly evolving, and global demand for WLAN coverage is growing. Institute of Electrical and Electronics Engineers Industry Code The IEEE 802.i l working group has defined a series of WLAN technology standards such as 802.11a, 802.11b, 802. l lg, etc., mainly to develop physical layer (PHY) and media access control (MAC) layer specifications. Subsequent other task forces have emerged to develop specifications that address existing 802.11 technology improvements. For example, the 802.11ah task force is primarily used for resources in the unlicensed band below the 1 GHz band to support new network applications such as smart grids, sensor networks, and cellular load sharing.

When formulating its technical specifications, the 802.11ah task group hopes that the technical specifications of 802.11ah will use the existing technical specifications of the 802.11 series as much as possible, and also make appropriate modifications to the existing technical specifications in order to meet the unique attributes of 802.1 lah itself. Or develop new technical specifications. At present, the 802.11ah task group determines that the working bandwidth of the technology can be 1/2/4/8/16 MHz, using OFDM (Orthogonal Frequency Division Multiplexing) modulation technology, each OFDM symbol (including long guard interval) The duration is 40 μ _δ , which is 10 times longer than the time required for each OFDM symbol in the existing 802.11 series of standards. In other words, the same information is sent, and the power consumption of the device using the 802.11ah technical specification will be 10 times that of the existing 802.11 technical specification, but the device conforming to the 802.11ah technical specification has a high demand for energy saving. This requires a more brief way to transfer information to complete the corresponding functions.

In the existing 802.11 technical specification, the basic network architecture is an access point (AP) and a plurality of non-AP stations (STAs) associated with the AP form a basic A basic service set (BSS), each basic service set has a basic service set identifier (BSSID). When transmitting, any station will reserve a channel access time after accessing the channel, and the listening station The point resolves the reservation time and determines whether to use the reserved time value to update the network allocation vector (NAV) of the site according to a certain rule. The value of the NAV is decremented with time, and the NAV of the listening site is not zero. , no channel access will be made. However, the channel access time of the site reservation may be greater than the actual access channel time. In order to improve the channel utilization rate, the station that has reserved the channel can release the channel before the reserved channel access time ends, and the observing site is made. The channel competition access process can be terminated by waiting. The current release channel is specifically completed by two MAC frames of CF-End or CF-End+CF-Ack (which also has the function of receiving and receiving the latest received frame). The frame control in the two MAC frames is used to indicate the frame type and the like, and the duration indicates the reserved channel access time. Both of the above frames reset the domain to complete the function of releasing the channel. In addition, the two frames have one thing in common in the format, they are MAC frames without MAC layer frame payload.

In the existing 802.11 technical specification, the signaling field of the physical frame header of a radio frame usually includes a LENGTH/DURATION subfield, an STBC subfield, an MCS (modulation and coding scheme) subfield, and an encoding type sub-domain. a subdomain of a domain, a CRC (cyclic redundancy code) subfield, and a reserved bit. This signaling domain is referred to herein as a general signaling domain, usually following the physical frame payload after the signaling domain, and some of the signaling domains. The information of the sub-domain is usually directed to the physical frame payload, such as the MCS sub-domain, indicating the modulation coding scheme used by the physical frame payload. If a radio frame does not carry a physical layer load, then some sub-domains in the signalling domain of the physical frame header, such as the MCS sub-domain, are meaningless.

Summary of the invention

The technical problem to be solved by the present invention is to provide a transmission method and a station device for releasing channel access indication information, thereby implementing a release channel indication function with fewer resources.

In order to solve the above technical problem, the present invention discloses a transmission method for releasing channel access indication information, including:

The sending station sends a radio frame, and the signaling domain of the physical layer header of the radio frame carries the release channel access indication information;

The receiving station receives the radio frame and resets the network allocation vector (NAV) of the station.

Preferably, in the foregoing method, the release channel access indication information is frame type indication information, The frame type refers to a frame type having a function of releasing a channel access function, or a frame type having a function of releasing a channel access function and a frame confirming function.

Preferably, in the above method, when the transmitting station sends a radio frame, one or more sub-domains in the signaling domain of the physical layer header of the radio frame are multiplexed to carry the release channel access indication information, where The value of the multiplexed one or more subfields indicates that the frame type of the radio frame is a frame type having a function of releasing channel access, or a frame type having a function of releasing a channel access function and a frame acknowledgment function.

Preferably, in the foregoing method, when the demodulation and coding (MCS) subfield of the physical layer header of the radio frame is multiplexed to carry the release channel access indication information, the value is determined by the MCS subfield. Indicates the frame type indication information of the current radio frame, where the value of the MCS subfield is an unused value; or, when the MCS subdomain and other subdomains in the general signaling domain of the physical layer header of the multiplexed radio frame are multiplexed When carrying the release channel access indication information, the frame type indication information of the current radio frame is indicated by the joint value of the MCS sub-domain and the other sub-domains, and the value of the MCS sub-domain in the joint value is The value of this subdomain that has not been used yet. Preferably, in the foregoing method, the signaling domain of the physical layer header of the radio frame further includes basic service set identifier (BSSID) information or partial BSSID information, and the partial BSSID information refers to the compressed BSSID information.

Preferably, in the foregoing method, the signaling domain of the physical layer header of the radio frame further includes cyclic redundancy check information, where the cyclic redundancy check information is verification information of the signaling domain information. , or joint verification information of signaling domain information and additional information.

Preferably, in the above method, the additional information is BSSID information, or is partial BSSID information, and the partial BSSID information refers to compressed BSSID information.

Preferably, in the foregoing method, the physical layer header of the radio frame further includes a short training sequence domain and a long training sequence domain, where the long training sequence domain is composed of multiple orthogonal frequency division multiplexing (OFDM) symbols.

Preferably, in the above method, the radio frame includes only a physical layer frame header.

Preferably, in the foregoing method, when there is a difference in phase between at least two OFDM symbols in the long training sequence field, indicating that the physical layer header carries the release channel access indication information;

After receiving the radio frame, the receiving station determines a signaling domain of a physical layer header of the radio frame according to a phase difference between OFDM symbols in a long training sequence domain of a physical layer header of the radio frame. The non-generic signaling domain obtains the frame type indication information field in the signaling domain of the physical layer header of the radio frame, and determines that the frame is a frame having the function of releasing channel access or has a release channel access function and frame confirmation. Functional frame.

Preferably, the method further includes: when the receiving station is an access point, receiving the radio frame, and sending a response frame with a release channel access function after a short frame interframe interval. The invention also discloses a site device, comprising:

The first module is configured to: when no longer accessing the channel before the termination time of the channel access reserved by the site, sending a radio frame, where the signaling domain of the physical layer header of the radio frame carries the release channel access Indication information;

The second module is configured to: receive a radio frame sent by another station, and reset the network allocation vector of the site when the channel access indication information carried in the signaling domain of the physical layer header of the received radio frame is received (NAV). Preferably, in the foregoing device, the release channel access indication information is frame type indication information, and the frame type refers to a frame having a release channel access function or a frame having a release channel access function and a frame acknowledgement function.

Preferably, in the foregoing device, the first module is configured to: multiplex one or more sub-domains in a signaling domain of a physical layer header of a radio frame to carry the release channel access indication information, where The value of the one or more sub-domains to be multiplexed indicates that the frame type of the radio frame is a frame type having a function of releasing channel access, or a frame type having a function of releasing a channel access function and a frame confirming function.

Preferably, in the foregoing device, the first module is configured to: when the MCS sub-domain in the signaling domain of the physical layer header of the multiplexed radio frame carries the release channel access indication information, pass the MCS sub-domain The value indicates the frame type indication information of the radio frame, where the value of the MCS subfield is an unused value;

When the MCS sub-domain and other sub-domains in the general signaling domain of the physical layer header of the radio frame are multiplexed to carry the release channel access indication information, the joint value indication by the MCS sub-domain and the other sub-domains is indicated. The frame type indication information of the current radio frame, where the value of the MCS sub-domain is not used by the sub-domain.

Preferably, in the foregoing device, the physical layer header of the radio frame further includes a short training sequence field, A long training sequence field consisting of a plurality of orthogonal frequency division multiplexing (OFDM) symbols. Preferably, in the foregoing device, the first module is configured to: indicate a phase difference between at least two OFDM symbols in a long training sequence domain of a physical layer header of the radio frame to indicate a physical layer header The device carries the release channel access indication information.

Preferably, in the foregoing device, the second module is configured to: when the site device is an access point, after receiving the radio frame carrying the release channel access indication information, after a short frame interframe interval, forwarding The received radio frame.

The technical solution of the present application effectively reduces the transmission load overhead and reduces the power consumption while ensuring the completion of the release channel indication function. In addition, physical layer signaling usually uses the most reliable modulation and coding scheme, and the function indication is placed in the physical layer signaling for transmission, which can improve the reliability of transmission.

BRIEF abstract

1 is a schematic diagram of a site device in accordance with an embodiment of the present invention.

Preferred embodiment of the invention

The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments of the present application may be combined with each other arbitrarily.

Example 1

Applicant has found that the current release channel is specifically completed by two MAC frames of CF-End or CF-End+CF-Ack (which also has the function of receiving and receiving the latest received frame), that is, the two frames are mainly completed. A function indicator. However, these two MAC frames are limited to the common frame format and carry a lot of unnecessary information, such as duration reset. This parameter is a fixed value (the default value of both sender and receiver). Therefore, the resource is wasted. Therefore, the applicant newly proposes a transmission scheme for releasing channel access indication information, which is mainly implemented when a certain station does not access the channel before the termination time of the reserved channel access of the station. The channel access function indication is released and the resources are occupied less. Specifically, the implementation process of the solution is as follows: The sending station sends a radio frame, where the signaling channel in the physical layer header of the radio frame carries the release channel access indication information;

The receiving station receives the radio frame and resets its own NAV.

In this embodiment, after receiving the radio frame, the receiving station may reset its NAV according to the release channel access indication information carried in the signaling domain of the physical layer header of the radio frame.

In this embodiment, the release channel access indication information is frame type indication information, and the frame type refers to a frame type (for example, CF-End) having a release channel access function, or a release channel access function and a frame confirmation function. Frame type (for example, CF-End+CF-Ack). Specifically, one or more sub-domains in the signaling domain may be multiplexed to carry release channel access indication information, and the frame type is indicated by the value of the multiplexed one or more sub-domains. For example, when multiplexing a sub-domain, the MCS sub-domain in the signaling domain of the physical layer header of the radio frame can be multiplexed. At this time, the value of the MCS sub-field can indicate that the frame type of the radio frame has The frame type of the channel access function is released, or the frame type has the function of releasing the channel access function and the frame confirmation function. However, it should be noted that when the MCS sub-domain is multiplexed, the value of the MCS sub-domain is an unused value, that is, the value of the MCS sub-domain in the existing signaling domain has not been used, so that it will not be associated with the MCS. The existing values of the subdomain conflict with each other to avoid misoperation. Similarly, when multiplexing multiple sub-domains, the MCS sub-domain and other sub-domains in the signaling domain of the physical layer header of the radio frame may be multiplexed. In this case, the combined values of the multiplexed MCS sub-domain and other sub-domains Indicates the frame type indication information of the current radio frame. Similarly, in the joint value, the value of the MCS subfield is the value that is not used in this subdomain. The above signaling domain may include BSSID information or partial BSSID information in addition to the release channel access indication information. Some BSSID information refers to the compressed BSSID information. In addition, the signaling domain further includes cyclic redundancy check information, which is verification information of the signaling domain information, or joint verification information of the signaling domain information and the additional information. The additional information is BSSID information, or part of the BSSID information.

It should also be noted that if the receiving station is the access point, the wireless frame is received, and after a short frame interval, the wireless frame can be forwarded.

Based on the above solution, the applicant proposes a preferred scheme, that is, including a short training sequence domain, a long training sequence domain, and a signaling domain in the physical layer frame header, as shown in FIG. 2. The information carried in the signaling domain is as described in the foregoing solution. The long training sequence domain may be composed of multiple OFDM symbols, and there is a phase difference between at least two OFDM symbols in the multiple OFDM symbols, that is, indication reception The signaling domain of the site physical layer frame header carries the release channel access indication information. In addition, since the radio frame is mainly used to indicate the release of the channel access, and the purpose of the indication is implemented by the physical layer header, the load domain is not required. Therefore, in the preferred solution, the embodiment is used. The described radio frame may only contain a physical layer header.

The transmission process of the release channel access indication information described above is further introduced in combination with a specific application scenario.

In scenario 802.11ah, when the network access mode uses the distributed coordination function (DCF, Distributed Coordination Function) or the Enhanced Distributed Channel Access (EDCA) mode, the result is a non- The AP camping point or the access point AP competes for the channel access opportunity, which is scheduled to be sta-1, and reserves a channel access duration through the frame it transmits, assuming that the channel access termination time is t1.

At time t2 before the arrival of the time t1, sta-1 will not access the channel because all the buffered data has been sent or other reasons. At this time, the sta-1 will send a frame with the function of releasing the channel access, in this embodiment. The physical layer header of this frame contains only three fields: short training sequence domain, long training sequence domain, and signaling domain. The two adjacent OFDM symbols in the long training sequence have a certain phase offset to indicate that the frame header carries the release channel access indication information (in this example, the frame type indication information), the signaling domain. The frame type indication information in the frame indicates that the frame is a frame with a release channel access function, and the frame signaling domain also carries a partial BSSID, a cyclic redundancy check sequence. This cyclic redundancy check sequence can be one of the following three, but it must be agreed by the sender and the receiver in advance:

The check sequence for the signaling domain alone, the combined check sequence for the partial BSSID for the signaling domain and the additional information, and the joint check sequence for the BSSID for the signaling domain and the additional information.

The station receiving the frame detects the difference between adjacent OFDM symbols in the long training sequence field in the physical layer header, and determines that the received signaling domain is not used in the signaling domain of the general signaling domain, and detects the cyclic redundancy check. If the error is correct, the frame is discarded. If the check is correct, the frame type indication information in the received signaling domain is further parsed, and the frame is determined to be a frame having the function of releasing channel access, for example, a CF-End frame. , then the receiving site will reset its NAV and enter the backoff process. In 802.11ah, when the network access mode uses the Distributed Coordination Function (DCF) or the Enhanced Distributed Channel Access (EDCA) mode, if a non-AP site is connected The ingress AP competes for the channel access opportunity, which is marked as sta-1, and reserves a channel access duration through the frame it transmits, assuming that the termination time of the channel access is t1.

At time t2 before the arrival of the time t1, sta-1 will not access the channel because all the buffered data has been sent or other reasons. At this time, the sta-1 will send a frame with the function of releasing the channel access, in this embodiment. The physical layer header of this frame contains only three fields: short training sequence domain, long training sequence domain, and signaling domain. The MCS domain in the signalling domain is multiplexed into a frame type indication field (that is, the MCS sub-domain is used to carry the release channel access indication information), and the value of the field is set to indicate that the frame is a frame type with the function of releasing the channel access. , where the value of the MCS is an unused value of the MCS subfield. The frame signaling domain also carries a part of the BSSID, and the signaling domain also carries at least a cyclic redundancy check sequence. The cyclic redundancy check sequence is one of the following three, but must be agreed by the transmitting and receiving parties in advance:

The check sequence for the signaling domain separately, the combined check sequence for the partial BSSID for the signaling domain and the additional information, and the joint check sequence for the BSSID for the signaling domain and the additional information.

The station that receives the above frame detects the cyclic redundancy check sequence. If the error occurs, the frame is discarded. If the check is correct, the MCS subfield is further parsed. If the value is not within the normal value range, the reception is determined. The signaling domain is a signaling domain that is not used in the general signaling domain. According to the value of the MCS domain, it is determined that the frame is a frame with a function of releasing channel access, for example, a CF-End frame, then the receiving site will reset itself. The NAV can also enter the backoff process.

Scene three

In 802.11ah, when the network access mode uses the Point Coordination Function (PCF) mode, if the access point AP receives the data sent by its scheduled station, it hopes to end the non-competition period in advance, AP. A frame with a release channel access function and a frame acknowledgement function will be sent. In this embodiment, the physical layer header of the frame includes only three domains: a short training sequence domain, a long training sequence domain, and a signaling domain. The two adjacent OFDM symbols in the long training sequence have a certain phase offset to indicate that the frame header carries the release channel access indication information (in this example, the frame type indication information), in the signaling domain. The frame type subfield indicates that the frame is a frame with a release channel access function and a frame acknowledgement function, and the frame signaling domain also carries a part of the BSSID, and the signaling domain still carries at least With a cyclic redundancy check sequence, this cyclic redundancy check sequence is one of the following three, but it must be agreed by the sender and the receiver in advance:

The station receiving the above frame, by parsing the adjacent layer in the long training sequence of the physical layer header

The difference of the OFDM symbol, it is determined that the receiving signaling domain is a signaling domain not used for the general signaling domain, and the cyclic redundancy check sequence is detected. If the error occurs, the frame is discarded, and if the check is correct, the received signaling is further parsed. The frame type information field in the domain, which is determined to be a frame with a function of releasing channel access and a frame acknowledgement function, such as a CF-End+CF-Ack frame, if the receiving station receives a short frame before the frame. A data frame is sent to the AP before the interval, then the receiving station will reset its own NAV, that is, the AP terminates the non-competition period, and can enter the backoff process, and considers that the data frame sent by the AP has been correctly configured by the AP. receive.

Scene four

In 802.11ah, when the network access mode uses point coordination function (PCF, Point Coordination

In the Function mode, if the access point AP receives no data transmission from its scheduled station, then the AP wants to end the non-competition period in advance, and the AP will send a frame with the function of releasing the channel access, in this embodiment. This frame physical layer header contains only three fields: short training sequence domain, long training sequence domain, and signaling domain. The two adjacent OFDM symbols in the long training sequence have a certain phase offset to indicate that the frame header carries the release channel access indication information (in this example, the frame type indication information), in the signaling domain. The frame type subfield indicates that the frame is a frame with a release channel access function, and the frame signaling domain also carries a part of the BSSID, and the signaling domain also carries at least a cyclic redundancy check sequence, and the cyclic redundancy check The sequence is one of the following three, but it must be agreed by the sender and the receiver in advance:

The check sequence for the signaling domain separately, the joint check sequence for the partial BSSID for the signaling domain and the additional information, and the joint check sequence for the BSSID for the signaling domain and the additional information;

The station that receives the frame detects the difference between the adjacent OFDM symbols in the long training sequence field of the physical layer frame header, and concludes that the received signaling domain is not used in the signaling domain of the general signaling domain, and detects the cyclic redundancy check sequence. If the error occurs, discard the frame. If the check is correct, further parse the frame type information field in the received signaling domain, and conclude that the frame is a frame with the function of releasing channel access, such as a CF-End frame, then This receiving site will reset its own NAV and think that the AP has terminated. During the dispute, you can enter the backoff process.

Example 2

This embodiment describes a site device, which can implement the transmission of the release channel access indication provided in the foregoing Embodiment 1. As shown in FIG. 1, the specific device includes at least a first module and a second module.

The first module, when the channel is not accessed before the termination time of the channel access reserved by the site, sends a radio frame, and the signaling domain of the physical layer header of the radio frame carries the release channel access indication information. . The release channel access indication information is frame type indication information, and the frame type refers to a frame with a release channel access function or a frame with a release channel access function and a frame acknowledgement function. Specifically, one or more sub-domains of the signalling domain of the physical layer header of the radio frame may be multiplexed to carry the release channel access indication information. At this time, the frame type of the radio frame can be indicated by the value of one or more subfields that are multiplexed. It should be noted that when the frame type of the radio frame is indicated by the value of one or more subfields, the value of the multiplexed subfield is an unused value of the subfield. For example, when the MCS sub-domain is multiplexed to carry the release channel access indication information, the value of the MCS sub-domain can be used to determine whether the current radio frame is a frame with a release channel access function or a release channel access function and the same. The frame type of the radio frame can also be determined by the joint value of multiple sub-domains, and the value of the MCS sub-domain is also required to be used in the sub-domain.

The above signaling domain may also contain BSSID information, or part of BSSID information. In this paper, some BSSID information refers to compressed BSSID information. In addition, the signaling domain further includes cyclic redundancy check information, which is verification information of the signaling domain information, or joint verification information of the signaling domain information and the additional information. The additional information is BSSID information, or part of the BSSID information.

Based on the implementation manner of the foregoing signaling domain, the physical layer header of the radio frame sent by the first module may further include a short training sequence domain and a long training sequence domain. The long training sequence field is composed of multiple orthogonal frequency division multiplexing (OFDM) symbols, and when there is a difference in phase between the at least two OFDM symbols, the physical layer header carries the release channel access indication information. .

The second module receives the radio frame sent by the other station, and resets the NAV of the local station when the channel access indication information carried in the signaling domain of the physical layer header of the received radio frame is received. Specifically, the second module may be a phase rotation between adjacent OFDM symbols in a long training sequence according to a physical layer header of the received radio frame, or according to a signaling domain of a physical layer header of the radio frame. The reserved information field determines that the signaling domain of the physical layer header of the radio frame is not a general signaling domain, and then acquires a frame type indication information field in the signaling domain of the physical layer header of the radio frame, and determines that the frame is released. A frame of a function of channel access or a frame having a function of releasing a channel access function and a frame confirming function. On this basis, it should be noted that if the site device is an access point, after receiving the radio frame carrying the release channel access indication information, the second module will forward after a short frame interval. The received radio frame.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be accomplished by a program instructing the associated hardware, such as a read-only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. This application is not limited to any specific form of combination of hardware and software.

It can be seen from the foregoing embodiment that the technical solution of the present application effectively reduces the transmission load overhead and reduces the power consumption while ensuring the completion of the release channel indication function. In addition, physical layer signaling usually uses the most reliable modulation and coding scheme, and the function indication is placed in the physical layer signaling for transmission, which can improve the reliability of transmission.

The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial and practical

Claims

Claim

A method for transmitting channel access indication information, the method comprising:

2. The method of claim 1 wherein

The release channel access indication information is frame type indication information, and the frame type refers to a frame type having a release channel access function, or a frame type having a release channel access function and a frame confirmation function.

3. The method of claim 2, wherein

When the transmitting station sends a radio frame, multiplex one or more sub-domains in the signaling domain of the physical layer header of the radio frame to carry the release channel access indication information, where the multiplexed one or The value of the multiple sub-domains indicates that the frame type of the radio frame is a frame type having a function of releasing channel access, or a frame type having a function of releasing a channel access and a frame confirming function.

4. The method of claim 3, wherein

When the demodulation and coding (MCS) subfield of the physical layer header of the radio frame is multiplexed to carry the release channel access indication information, the MCS subfield value indicates the frame type indication of the radio frame. Information, where the value of the MCS subfield is an unused value;

Alternatively, when the MCS sub-domain and other sub-domains in the general signaling domain of the physical layer header of the radio frame are multiplexed to carry the release channel access indication information, the MCS sub-domain and the other sub-domains are jointly obtained. The value indicates the frame type indication information of the current radio frame. In the joint value, the value of the MCS subfield is not used by the subfield.

5. The method according to any one of claims 1 to 4, wherein

The signaling domain of the physical layer header of the radio frame further includes basic service set identifier (BSSID) information or partial BSSID information, and the partial BSSID information refers to the compressed BSSID information.

6. The method according to any one of claims 1 to 4, wherein The signaling domain of the physical layer header of the radio frame further includes cyclic redundancy check information; where the cyclic redundancy check information is verification information of signaling domain information, or is signaling domain information and Joint verification information for additional information.

7. The method of claim 6, wherein

The additional information is BSSID information, or is partial BSSID information, and the partial BSSID information refers to compressed BSSID information.

8. The method according to any one of claims 1 to 4, wherein

The physical layer header of the radio frame further includes a short training sequence field, a long training sequence field, and the long training sequence field is composed of a plurality of orthogonal frequency division multiplexing (OFDM) symbols.

9. The method of claim 8 wherein

The radio frame includes only physical layer headers.

10. The method of claim 8 wherein

When there is a difference in phase between at least two OFDM symbols in the long training sequence field, indicating that the physical layer header carries the release channel access indication information;

After receiving the radio frame, the receiving station determines, according to a phase difference between OFDM symbols in a long training sequence field of a physical layer frame header of the radio frame, that a signaling domain of a physical layer header of the radio frame is not a general signaling domain. Then, the frame type indication information field in the signaling domain of the physical layer header of the radio frame is obtained, and the frame is determined to be a frame having a function of releasing channel access or a frame having a function of releasing channel access and a frame confirming function.

The method according to any one of claims 1 to 4, wherein the method further comprises: when the receiving station is an access point, receiving the radio frame, and sending a short interval after a short frame interval A response frame with a release channel access function.

12. A site device, the device comprising:

The first module is configured to: when no longer access the channel before the termination time of the channel access reserved by the site, send a radio frame, where the signaling domain of the physical layer header of the radio frame carries a release channel connection Indication information;

The second module is configured to: receive a radio frame sent by another station, and reset the network allocation vector of the site when the channel access indication information carried in the signaling domain of the physical layer header of the received radio frame is received (NAV).

13. The apparatus according to claim 12, wherein

The release channel access indication information is frame type indication information, and the frame type refers to a frame having a release channel access function or a frame having a release channel access function and a frame confirmation function.

14. The apparatus according to claim 13, wherein

The first module is configured to: multiplex one or more sub-domains in a signaling domain of a physical layer header of a radio frame to carry the release channel access indication information, where the multiplexed one or The value of the multiple sub-domains indicates that the frame type of the radio frame is a frame type having a function of releasing channel access, or a frame type having a function of releasing a channel access and a frame confirming function.

The device according to claim 14, wherein the first module is configured to: when multiplexing an MCS sub-domain in a signaling domain of a physical layer header of a radio frame to carry the release channel access indication information The value of the MCS subfield indicates the frame type indication information of the radio frame, where the value of the MCS subfield is an unused value;

16. The apparatus according to any one of claims 12 to 15, wherein

17. The apparatus according to claim 16, wherein

The first module is configured to: indicate, by using a phase difference between at least two OFDM symbols in a long training sequence domain of a physical layer frame header of the radio frame, to indicate that the physical layer header carries a release Channel access indication information.

The device according to claim 16, wherein the second module is configured to: when the site device is an access point, after receiving the radio frame carrying the release channel access indication information, in a short frame frame After the interval, the received radio frame is forwarded.