CN106788910B

CN106788910B - Method and device for changing transmission opportunity holder

Info

Publication number: CN106788910B
Application number: CN201510810073.1A
Authority: CN
Inventors: 李云波; 李彦淳; 淦明
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-11-20
Filing date: 2015-11-20
Publication date: 2020-07-07
Anticipated expiration: 2035-11-20
Also published as: CN106788910A; WO2017084503A1

Abstract

The embodiment of the invention provides a method and a device for changing a transmission opportunity holder, wherein the method comprises the following steps: a station sends a request frame, wherein the request frame comprises an address field corresponding to a transmission opportunity holder, and the address field corresponding to the transmission opportunity holder in the request frame is filled with an address of an Access Point (AP); the station receives a response frame replied by the AP according to the request frame; wherein, the station is the station which obtains the channel access right. In the embodiment of the invention, the address field corresponding to the TXOP holder in the request frame is filled with the address of the AP, and the sites receiving the request frame set the address of the AP as the address of the TXOP holder, so that the right of the TXOP holder can be successfully transferred to the AP, and the AP can schedule the sites.

Description

Method and device for changing transmission opportunity holder

Technical Field

The present invention relates to wireless communication technologies, and in particular, to a method and an apparatus for changing a transmission opportunity holder.

Background

Currently, the Wireless Local Area Network (WLAN) mainly adopts the IEEE802.11 series, which is an Institute of Electrical and Electronics Engineers (Institute of Electrical and Electronics Engineers). Specifically, the IEEE802.11 standard works on an unlicensed spectrum, wherein a carrier sense multiple access/collision avoidance mechanism (CSMA/CA) is a basic mechanism for accessing a channel, and a Station (STA) first senses the channel, starts to backoff if the channel is idle for a certain time length, and obtains channel access right when the value of the backoff counter is reduced to 0, so that data transmission can be performed using the channel. In the ieee802.11e standard, in order to improve the efficiency of the system, a transmission opportunity (TXOP) concept is introduced, that is, a period of time is reserved after a station obtains a channel access right, and multiple frames are transmitted without interference in the period of time, and a channel is contended independently when each frame is not transmitted, so that contention overhead is saved, and the system efficiency is improved, where the reserved period of time is referred to as a TXOP, and the station obtaining the channel access right serves as a transmission opportunity holder (TXOP).

In the next generation WLAN system, an Orthogonal Frequency Division Multiple Access (OFDMA) technology is introduced in the 802.11ax standard, and an Access Point (AP) may schedule an STA to transmit uplink data on a Resource Unit (RU) specified by the AP at the same time, and similarly, may also instruct the STA to receive downlink data on an RU specified by the AP at the same time. In the prior art, for the OFDMA technology, in order to provide system efficiency, a station acquires a TXOP through contention, and then uses the TXOP to perform data transmission, and after the data transmission is completed, if the TXOP still has remaining time, the TXOP usage right is transferred to an AP, and the AP may send downlink data to one or more stations after acquiring the TXOP usage right.

However, with the prior art, after the AP acquires the TXOP usage right, the station competing for acquiring the channel usage right is still the TXOP holder, and after the stations except the TXOP holder receive the data sent by the AP, the stations except the TXOP holder may not reply information to the AP in order to avoid interference, so that when the AP and the station perform message transmission, the stations except the TXOP holder may not reply the message transmitted by the AP, and further, the message transmission fails.

Disclosure of Invention

The invention provides a transmission opportunity holder changing method and device, which are used for solving the problem that in the prior art, when an AP (access point) and a station transmit messages, the stations except a TXOP holder possibly cannot reply the message transmission, so that the message transmission fails.

A first aspect of the present invention provides a transmission opportunity holder changing method, including:

a station sends a request frame, wherein the request frame comprises an address field corresponding to a transmission opportunity holder, and the address field corresponding to the transmission opportunity holder in the request frame is filled with an address of an Access Point (AP);

the station receives a response frame replied by the AP according to the request frame;

wherein, the station is the station which obtains the channel access right.

A second aspect of the present invention provides a transmission opportunity holder changing method, including:

an Access Point (AP) receives a request frame sent by a station, wherein the request frame comprises an address field corresponding to a transmission opportunity holder, and the address field corresponding to the transmission opportunity holder in the request frame is filled with an address of the AP, wherein the station is the station for obtaining a channel access right;

and the AP sends a response frame to the station according to the request frame.

A third aspect of the present invention provides a station comprising:

the transceiver is used for sending a request frame, the request frame comprises an address field corresponding to a transmission opportunity holder, and the address field corresponding to the transmission opportunity holder in the request frame is filled with an address of an Access Point (AP); receiving a response frame replied by the AP according to the request frame;

wherein, the station is the station which obtains the channel access right.

A fourth aspect of the present invention provides an access point, comprising:

the transceiver is used for receiving a request frame sent by a station, wherein the request frame comprises an address field corresponding to a transmission opportunity holder, and the address field corresponding to the transmission opportunity holder in the request frame is filled with the address of the AP, wherein the station is the station which obtains the channel access right; and sending a response frame to the station according to the request frame.

In the method and the device for changing the transmission opportunity holder, the address field corresponding to the TXOP holder in the request frame is filled with the address of the AP, and the sites receiving the request frame set the address of the AP as the address of the TXOP holder, so that the right of the TXOP holder can be successfully transferred to the AP, and the AP can schedule the sites.

A fifth aspect of the present invention provides a transmission opportunity holder changing method, including:

an Access Point (AP) receives a request frame sent by a station, wherein the request frame carries a time period corresponding to a transmission opportunity, and the station is a station for obtaining a channel access right;

and the AP replies a response frame to the site according to the request frame, wherein the time period identified by the duration field in the response frame is the sum of the time period corresponding to the transmission opportunity and a preset time period.

A sixth aspect of the present invention provides an access point, comprising:

the transceiver is used for receiving a request frame sent by a station, wherein the request frame carries a time period corresponding to a transmission opportunity, and the station is a station for obtaining a channel access right; and replying a response frame to the site according to the request frame, wherein the time period identified by the duration field in the response frame is the sum of the time period corresponding to the transmission opportunity and a preset time period.

In the method and the device for changing the transmission opportunity holder, after the AP receives a request frame sent by a station, according to a time period corresponding to a TXOP in the request frame, the time period identified by a time length field in a response frame is set as the sum of the time period corresponding to the TXOP and a preset time period, so that other stations update a NAV value after receiving the response frame, and the address of the TXOP holder is set as the address of the AP, namely, the right of the TXOP holder is transferred to the AP by prolonging the time period identified by the time length field.

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 architecture of a transmission opportunity holder change method provided in the present invention;

fig. 2 is a flowchart illustrating a first method for changing a transmission opportunity holder according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a request frame in a transmission opportunity holder change method provided in the present invention;

fig. 4 is a flowchart illustrating a second method for changing a transmission opportunity holder according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a first station according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a second access point according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a third access point according to the embodiment of the present invention.

Detailed Description

The embodiment of the invention is suitable for the WLAN which mainly adopts the standard of IEEE802.11 series. The WLAN may include a plurality of Basic Service Sets (BSSs), where each BSS includes an AP and a plurality of STAs associated with the AP. Fig. 1 is a schematic view of an application scenario architecture of a transmission opportunity holder change method provided by the present invention, and in a network shown in fig. 1, one BSS includes 1 Access Point (AP) and 3 Stations (STA): STA1, STA2, STA 3.

Note that, if the transmission data sent from STA1 can be detected by AP and STA2, and the transmission data sent from STA1 cannot be detected by remote STA3 but only by AP, STA3 is a hidden node with respect to AP and STA 1.

In particular, the AP is also referred to as a wireless access point or a hotspot, etc. The AP is an access point for a mobile subscriber to enter a wired network, and is mainly deployed in a home, a building, and a campus, and typically has a coverage radius of several tens of meters to hundreds of meters, and may be deployed outdoors. The AP acts as a bridge connecting the network and the wireless network, and mainly functions to connect the wireless network clients together and then to access the wireless network to the ethernet. Specifically, the AP may be a terminal device or a network device with a Wireless Fidelity (WiFi) chip. Optionally, the AP may be a device supporting 802.11ax standard, and further optionally, the AP may also be a device supporting multiple WLAN standards such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11 a.

The STA may be a wireless communication chip, a wireless sensor, or a wireless communication terminal. For example, the STA may be: the mobile phone supporting the Wi-Fi communication function, the tablet personal computer supporting the Wi-Fi communication function, the set top box supporting the Wi-Fi communication function, the smart television supporting the Wi-Fi communication function, the smart wearable device supporting the Wi-Fi communication function, the vehicle-mounted communication device supporting the Wi-Fi communication function, the computer supporting the Wi-Fi communication function and the like. Optionally, the STA may support an 802.11ax system, and further optionally, the STA may also support multiple WLAN systems such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11 a.

In the WLAN system 802.11ax introduced after the OFDMA technique, the AP may perform uplink and downlink transmission on different time-frequency resources to a plurality of different STAs. Specifically, the AP may use different modes for uplink and downlink transmission, such as an OFDMA Single-User Multiple-Input Multiple-Output (SU-MIMO) mode, or an OFDMA Multi-User Multiple-Input Multiple-Output (MU-MIMO) mode, where the Multiple different STAs refer to Multiple different sites in the SU-MIMO mode; in the MU-MIMO mode, the plurality of different STAs may refer to a plurality of different station groups.

The embodiment of the present invention is directed to a scenario in which one of the stations has already obtained a channel access right, specifically, the channel access right may be obtained through contention, or obtained through negotiation or allocation with an AP, an AP controller (AC for short), another station, and the like, which is not limited herein. After the station obtains the channel access right, the reserved time period TXOP is set by a Duration (Duration) field in the transmitted frame, after the station obtaining the channel access right transmits the frame, if a non-target station (a station other than the station corresponding to the destination address of the transmitted frame) receives the frame, the time identified by the Duration field in the frame is set as a Network Allocation Vector (NAV) value, and silence is maintained within the NAV time, so as to avoid interference to the channel reservation station. After the NAV is set to a non-zero value, its value will decrease over time. If a new frame is received before the NAV of a station is reduced to 0 and the Duration indicated by the Duration field of the new frame is greater than the NAV value, the NAV value is updated to the Duration indicated by the Duration field of the new frame.

For OFDMA technology, especially uplink MU-MIMO, the purpose of the embodiments of the present invention is to transfer the right of TXOP holder to AP, i.e. to hand channel resources to AP scheduling, which is more efficient than transmitting the system by STA through contention.

The embodiment of the invention relates to two mechanisms of transferring a channel access right and changing TXOP holder, wherein the transferring of the channel access right refers to transferring a channel use right at a later period of time, namely originally the channel is dominated and used by STA1, but the channel is dominated and used by AP after being transferred, and the transferring of the channel access right mainly refers to that a transferor and a transferee know which user of the channel is, so as to avoid conflict caused by simultaneous use of the channel by the transferor and the transferee. The change of TXOP holder lets third-party stations other than STA1 and the AP make clear who the users of the channel are at that time.

Fig. 2 is a flowchart illustrating a first method for changing a transmission opportunity holder according to an embodiment of the present invention, where a main station is a station that obtains a channel access right, as shown in fig. 2, the method includes:

s201, the station sends a request frame, where the request frame includes an address field corresponding to the transmission opportunity holder, and the address field corresponding to the transmission opportunity holder in the request frame is filled with the address of the AP.

S202, the AP receives the request frame sent by the station, and replies a response frame according to the request frame.

The station may send the request frame in a broadcast manner, so that the AP and some other stations may receive the request frame.

In different scenarios, the type of the Request frame may be various, for example, a Request To Send (RTS) frame, a Clear To Send (CTS) frame, a data (data) frame, a Resource Allocation Request (RAR) frame, and the like, which are not limited herein. There are generally two address fields in the request frame, denoted as "address 1" and "address 2", where one address field (address1) is used to fill the address of the receiving node, and the other address field (address2) is used to fill the address of the transmitting node (i.e., the address of the TXOP holder); there are also types of request frames that have only one address field, which is then used to fill the address of the TXOP holder.

The address of the AP may be a Medium Access Control (MAC) address of the AP, that is, an identifier (BSSID) of a BSS in which the AP is located. After receiving the request frame, the AP sees that the address field corresponding to the TXOP holder in the request frame is filled with its own address, and knows that the station transfers the right of the TXOP holder to itself.

Other stations receiving the request frame set the address of the TXOP holder according to the address filled in the address field corresponding to the TXOP holder in the request frame, in this embodiment, the address of the AP is filled in the address field corresponding to the TXOP holder in the request frame, and the stations receiving the request frame set the address of the AP as the address of the TXOP holder, so that the right of the TXOP holder can be successfully transferred to the AP.

In the current standard, a station records the address of the TXOP holder, and after receiving a frame sent by an AP, if it is found that the address of a sending node carried in the frame is the address of the TXOP holder, the station replies a response frame after a short interframe space (SIFS) is finished, and if the address of the sending node carried in the frame is different from the address of the TXOP holder, the station does not reply. In this embodiment, the other stations that receive the request frame set the address of the TXOP holder as the address of the AP according to the address filled in the address field corresponding to the TXOP holder in the request frame, and then respond when receiving the frame sent by the AP, thereby implementing that the AP can schedule these stations.

Since there may be stations forming hidden nodes with the stations, the stations may not receive the request frame, and there is no way to set the AP to TXOP holder. The response frame sent by the AP also includes an address field corresponding to the TXOP holder, and on the basis of the embodiment, in order to better ensure that stations in the BSS can set the AP to be the TXOP holder, the address field corresponding to the TXOP holder is also filled with the address of the AP by the response frame.

Specifically, the following several scenarios illustrate different types of the request frame and the response frame:

1) the request frame is an RTS frame or a multi-user RTS (MU-RTS) frame; the response frame is a CTS frame. This may be the case, but not limited to, if the station wants to detect whether other channels are idle.

In the RTS frame or the MU-RTS frame, there are two address fields, which are denoted as "address 1" and "address 2", and conventionally, BSSID (i.e., receiving address RA) and "address 2" are commonly filled in "address 1" to fill the MAC address of the station (i.e., the address corresponding to TXOP holder and also the address of the transmitting node), whereas in the present embodiment, the station fills "address 1" to the MAC address of the station and "address 2" to the BSSID (i.e., the address of the AP). The principle can be referred to in the following several examples.

The CTS frame replied by the AP has one address field, which is denoted as "address 1", and the AP may set the address1 as the BSSID (i.e., the address of the AP), or may not set the address field.

2) The request frame is a CTS frame; the response frame is also a CTS frame. This may be the case, but not limited to, that the station notifies other stations not to interfere through the CTS frame.

The CTS frame has an address field, and the station fills the address field in the CTS frame with BSSID and then transmits the address field. The AP replies to the CTS frame and may also pad the address field in the CTS frame with the BSSID.

3) The request frame is a CTS frame; the response frame is a data frame or a trigger frame.

The CTS frame has an address field, and the station fills the address field in the CTS frame with BSSID and then transmits the address field. After receiving the CTS frame, the AP knows that the right of TXOPholder is transferred to itself when seeing that the address of the address field in the CTS frame is the same as the address of itself, and then the AP can directly perform downlink data transmission, that is, transmit a data frame, or transmit a trigger frame for uplink scheduling.

Specifically, two address fields, namely "address 1" and "address 2", are included in a data frame sent by the AP, and generally, "address 2" (address field corresponding to TXOP holder) may be filled with BSSID; "address 1" fills the MAC address, broadcast address, or multicast address of the station;

similarly, the trigger frame sent by the AP also includes two address fields, which are denoted as "address 1" and "address 2", and generally, "address 2" (address field corresponding to TXOP holder) may be filled with BSSID; "address 1" fills the MAC address, broadcast address, or multicast address of the station.

4) The request frame is a data frame or an RAR frame; the response frame is a Block Acknowledgement (BA) frame or a Resource allocation response frame.

The station fills the data frame or an address field corresponding to the TXOP holder in the RAR frame with the BSSID, specifically, there are two address fields in the data frame, which are denoted as "address 1" and "address 2", and generally, "address 2" (the address field corresponding to the TXOP holder) may be filled with the BSSID; "address 1" fills the MAC address of the station;

similarly, the RAR frame also includes two address fields, which are denoted as "address 1" and "address 2", and generally, "address 2" (address field corresponding to TXOP holder) may be filled with BSSID; "address 1" fills the MAC address of the station.

When the AP replies to the BA frame or the resource allocation response frame, the existing state may be maintained, or the address field corresponding to the TXOPholder may be filled with the BSSID. Specifically, if the address field corresponding to the TXOP holder is to be filled with BSSID, the BA frame has two address fields, which are denoted as "address 1" and "address 2", and generally, "address 2" (the address field corresponding to the TXOP holder) may be filled with BSSID; "address 1" fills the MAC address of the station; similarly, the resource allocation response frame also includes two address fields, which are denoted as "address 1" and "address 2", and generally, "address 2" (address field corresponding to TXOP holder) may be filled with BSSID; "address 1" fills the MAC address of the station.

5) The request frame is a data frame; the response frame is an Acknowledgement (ACK) frame. In some cases, the station may send data directly, and the station fills the address field corresponding to the TXOP holder in the data frame with the BSSID. Specifically, there are two address fields in the data frame, which are denoted as "address 1" and "address 2", and generally, "address 2" (address field corresponding to TXOP holder) may be filled with BSSID; "address 1" fills the MAC address of the station.

Accordingly, when the AP replies the ACK frame, the AP may keep the existing state, or may fill the address field corresponding to the TXOP holder therein with the BSSID, and generally, the ACK frame is in one address field, so that the address field is filled with the BSSID.

It should be noted that the types of the request frame and the response frame are merely examples, and are not limited thereto.

Further, in the above embodiment, the BSSID needs to be filled in the address field corresponding to the original TXOPholder in the request frame by using the existing standard. On the basis of the foregoing embodiment, in order to more flexibly transfer the right of TXOP holder to the AP, the request frame may further include: and the first indication identifier is used for indicating the position of the address field corresponding to the TXOPholder in the request frame.

Thus, the station does not have to place the address of the AP (BSSID) in the address field corresponding to the TXOP holder in the original standard. For example, in 1) above, BSSID (i.e., the received address RA) and address2 may be filled in "address 1", and then the address field corresponding to the TXOP holder of "address 1" is indicated by the first indication identifier. Specifically, the first indication identifier may be represented by "0" or "1", and when the first indication identifier is "1", it represents that "address 1" is an address field corresponding to TXOP holder, and when the first indication identifier is "0", it represents that "address 2" is an address field corresponding to TXOPholder. Similar processing may be performed in other cases, which is not described herein, but is not limited thereto, as long as the position of the address field corresponding to the TXOP holder can be indicated.

The first indicator may be carried in a Signal (SIG) field of a physical layer of the frame, for example, a High Efficiency wireless local area network Signal a (HE-SIG-a) field, or a High Efficiency wireless local area network Signal B (HE-SIG-B) field. The first indication identification may also multiplex a frame control field in the request frame.

For example, the RTS frame and the CTS frame belong to a control frame, and a frame control field in the control frame may be used as the first indicator. Fig. 3 is a schematic structural diagram of a request frame in a transmission opportunity holder change method provided by the present invention. Fig. 3 shows, by way of example, a frame control field of a control frame, where the frame control field includes: the "protocol version" subfield, "Frame Type (Type)" subfield, "subtype (subtype)" subfield, "To distribution system (ToDS)" subfield, "From Distribution System (DS)" subfield, "More fragment (More Frame)" subfield, "Power Management (Power Management)", "retransmission (Retry)" subfield, "More Data (More Data)" subfield, "Protected Frame" subfield, "in-Order (transmission) (Order)" subfield, wherein the six subfields of To DS, From DS, MoreFrag, Retry, Protected Frame, and Order are set To zero by default, and 1 bit thereof may be multiplexed To be used as the first indication identifier. If more than two address fields are selectable, multiple bits may be multiplexed as the first indicator.

Correspondingly, the response frame replied by the AP may also include a second indication identifier, which is used to indicate a location of an address field corresponding to the transmission opportunity holder in the response frame. The implementation manner is similar to the first indicator, and is not described herein again.

On the basis of the foregoing embodiment, the request frame may further include: and the third indication identifier is used for indicating whether to set an address field corresponding to the transmission opportunity holder according to the request frame. Namely, the method is used for identifying whether other stations need to set the corresponding addresses of the transmission opportunity holders according to the request frames after receiving the request frames. Specifically, it is assumed that the third indication flag is "1" indicating that the non-target station receiving the request frame needs to set an address of the TXOP holder according to the request frame, that is, the non-target station sets an address filled in an address field corresponding to the TXOP holder in the request frame as the address of the TXOP holder; assuming that the third indication flag is "0" indicating that the non-target station receiving the request frame does not need to set the address of the TXOP holder according to the request frame, in this case, after the non-target station receives the request frame, even if the duration indicated by the duration field in the request frame is longer than the NAV duration, the non-target station does not need to update the TXOP holder, but only needs to update the NAV duration. Of course, the third indicator is not necessarily 0 or 1, and is not limited herein.

Correspondingly, the response frame may also include a fourth indication identifier, configured to indicate whether to set an address corresponding to the transmission opportunity holder according to the response frame. The implementation principle is similar to the third indicator, and is not described herein again.

For example, in a certain situation, the station sends a request frame, and the address field corresponding to the TXOP holder in the station is filled with the MAC address of the station, but the third indication identifier indicates that the non-target station that receives the request frame does not need to set the address of the TXOP holder according to the request frame, so that the non-target station does not update the address of the TXOPholder, that is, the MAC address of the station is not set to the address of the TXOP holder; furthermore, when the AP replies the response frame, the address of the AP is filled in the address field corresponding to the TXOP holder, and the non-target station that receives the response frame is indicated by the fourth indication identifier to set the address of the TXOP holder according to the request frame, so that the non-target station records the address of the AP as the address of the TXOP holder after receiving the response frame.

It should be noted that, according to different scenarios, the request frame may include both the first indicator and the third indicator, or may include only one of them. Similarly, the response frame may include both the second indicator and the fourth indicator, or only one of them, which is not limited to this.

Fig. 4 is a flowchart illustrating a second embodiment of a method for changing a transmission opportunity holder according to the present invention, as shown in fig. 4, the method includes:

s401, the AP receives a request frame sent by the station, and the request frame carries a time period corresponding to the TXOP.

The station is a station for obtaining the channel access right.

And the time period corresponding to the TXOP is carried in the duration field of the request frame.

And S402, the AP replies a response frame to the station according to the request frame, wherein the time period identified by the time length field in the response frame is the sum of the time period corresponding to the TXOP and a preset time period.

After receiving the request frame, the AP extends the time period identified by the request frame duration field to obtain an extended time period and carries the extended time period in the response frame.

Thus, after receiving the response frame, the other station determines whether the duration indicated by the duration field in the response frame is greater than the NAV current value, and if the duration indicated by the duration field in the response frame is greater than the NAV current value, the NAV is updated, that is, the NAV value is updated to the duration identified by the duration field in the response frame, and the address of the TXOP holder carried in the response frame (that is, the address of the AP) is set as the address of the current transmission opportunity holder, and at this time, the other station takes the AP as the TXOP holder.

In this embodiment, after receiving a request frame sent by a station, an AP sets a time period identified by a duration field in a response frame to a sum of a time period corresponding to a TXOP and a preset time period according to a time period corresponding to the TXOP in the request frame, so that other stations update a NAV value after receiving the response frame, and sets an address of the TXOP holder to an address of the AP, that is, by extending the time period identified by the duration field, the right of the TXOP holder is transferred to the AP.

In a specific implementation process, a time period identified by a duration field in a response frame is T1-a short inter-frame space SIFS-response frame length + Δ T, where T1 is a time period corresponding to a TXOP (i.e., a time period indicated by a duration field in a request frame), and Δ T is the preset time period.

Note that, when the "T1-short interframe space SIFS-response frame length" is denoted as T0, in a specific implementation, a station forming a hidden node with an AP may start to contend for a channel after T0, and a station capable of hearing the AP sending the response frame may start to contend for the channel after "T0 + Δ T", which may cause unfairness among stations. Preferably, to ensure fair competition among stations, Δ T should be smaller than a preset threshold. In one embodiment, Δ T is less than the duration of one time slot (time), and although the time when different stations start to contend for the channel is slightly different, since backoff is based on the minimum unit of time, specifically, for a system including the time latitude to perform channel access backoff, the duration of time is the interval between two adjacent access opportunities, so that Δ T less than one time does not affect fairness between different stations. Wherein 1 timeout is usually 9 microseconds, and preferably Δ T may be 1 microsecond, but not limited thereto.

Fig. 5 is a schematic structural diagram of a first station embodiment provided in the present invention, and as shown in fig. 5, the station 1000 includes: general processor 501, memory 502, signal processor 503, transceiver 504, and antenna 505.

The general processor 501, memory 502, signal processor 503, transceiver 504, and antenna 505 are coupled together by a bus 506.

In particular, the general processor 501 controls the operation of the station 1000. Memory 502 may include read-only memory and random access memory and provides instructions and data to general-purpose processor 501, and general-purpose processor 501 may be a CPU, DSP, ASIC, FPGA, or other programmable logic device. A portion of the memory 502 may also include non-volatile row random access memory (NVRAM). Transceiver 504 receives and transmits signals through antenna 505; the signal processor 303 decodes the received signal and generates a signal to be transmitted. Specifically, in this embodiment:

the transceiver 504 is configured to send a request frame, where the request frame includes an address field corresponding to a transmission opportunity holder, and an address of an access point AP is filled in the address field corresponding to the transmission opportunity holder in the request frame; receiving a response frame replied by the AP according to the request frame;

wherein, the station is the station which obtains the channel access right.

The station is configured to execute the foregoing method embodiments, and the implementation principle and technical effect are similar, which are not described herein again.

Optionally, the response frame includes an address field corresponding to the transmission opportunity holder, and the address field corresponding to the transmission opportunity holder in the response frame is filled with the address of the AP.

Optionally, the request frame further includes: a first indication identifier, configured to indicate a location of an address field corresponding to a transmission opportunity holder in the request frame; and/or the presence of a gas in the gas,

the response frame further includes: a second indication identifier, configured to indicate a location of an address field corresponding to a transmission opportunity holder in the response frame.

Further, the request frame further includes: a third indication identifier, configured to indicate whether to set an address corresponding to a transmission opportunity holder according to the request frame; and/or the presence of a gas in the gas,

the response frame further includes: and a fourth indication identifier, where the fourth indication identifier is used to indicate whether to set an address corresponding to the transmission opportunity holder according to the response frame.

Fig. 6 is a schematic structural diagram of a second embodiment of an access point provided in the present invention, and as shown in fig. 6, the access point 1001 includes: a general-purpose processor 601, a memory 602, a signal processor 603, a transceiver 604, and an antenna 605.

The general processor 601, memory 602, signal processor 603, transceiver 604, and antenna 605 are coupled together by a bus 606.

In particular, the general purpose processor 601 controls the operation of the access point 1001. The memory 602 may include read-only memory and random access memory and provides instructions and data to the general-purpose processor 601, which may be a CPU, DSP, ASIC, FPGA or other programmable logic device. A portion of the memory 602 may also include non-volatile row random access memory (NVRAM). The transceiver 604 receives and transmits signals through the antenna 605; the signal processor 603 decodes the received signal and generates a signal to be transmitted. Specifically, in this embodiment:

the transceiver 604 is configured to receive a request frame sent by a station, where the request frame includes an address field corresponding to a transmission opportunity holder, and the address field corresponding to the transmission opportunity holder in the request frame is filled with an address of the AP, where the station is a station that obtains a channel access right; and sending a response frame to the station according to the request frame.

Fig. 7 is a schematic structural diagram of a third embodiment of an access point provided in the present invention, and as shown in fig. 7, the access point 1002 includes: a general purpose processor 701, a memory 702, a signal processor 703, a transceiver 704, and an antenna 705.

The general processor 701, memory 702, signal processor 703, transceiver 704, and antenna 705 described above are coupled together by a bus 706.

In particular, a general purpose processor 701 controls the operation of access point 1002. The memory 702 may include read-only memory and random access memory and provides instructions and data to the general-purpose processor 701, and the general-purpose processor 701 may be a CPU, DSP, ASIC, FPGA, or other programmable logic device. A portion of the memory 702 may also include non-volatile row random access memory (NVRAM). Transceiver 704 receives and transmits signals through antenna 705; the signal processor 703 decodes the received signal and generates a signal to be transmitted. Specifically, in this embodiment:

a transceiver 704, configured to receive a request frame sent by a station, where the request frame carries a time period corresponding to a transmission opportunity, and the station is a station that obtains a channel access right; and replying a response frame to the site according to the request frame, wherein the time period identified by the duration field in the response frame is the sum of the time period corresponding to the transmission opportunity and a preset time period.

Optionally, the time period identified by the duration field in the response frame is a sum of the time period corresponding to the transmission opportunity and a preset time period, and specifically includes:

the time period identified by the duration field in the response frame is T1-short inter-frame space SIFS-response frame length + Δ T, where T1 is the time period corresponding to the transmission opportunity, and Δ T is the preset time period.

In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

Claims

1. A transmission opportunity holder changing method, comprising:

a station sends a request frame, wherein the request frame comprises an address field corresponding to a transmission opportunity holder, the address field corresponding to the transmission opportunity holder in the request frame is filled with an address of an Access Point (AP), and the request frame is also used for indicating whether other stations receiving the request frame set the address of the transmission opportunity holder according to the address field corresponding to the transmission opportunity holder in the request frame;

wherein, the station is the station which obtains the channel access right.

2. The method according to claim 1, wherein the response frame includes an address field corresponding to a transmission opportunity holder, and the address field corresponding to the transmission opportunity holder in the response frame is filled with the address of the AP.

3. The method of claim 1 or 2, wherein the request frame further comprises: a first indication identifier, configured to indicate a location of an address field corresponding to a transmission opportunity holder in the request frame; and/or the presence of a gas in the gas,

4. The method of claim 1 or 2, wherein the request frame further comprises: a third indication identifier, configured to indicate whether to set an address corresponding to a transmission opportunity holder according to the request frame; and/or the presence of a gas in the gas,

5. A transmission opportunity holder changing method, comprising:

an Access Point (AP) receives a request frame sent by a station, wherein the request frame comprises an address field corresponding to a transmission opportunity holder, and the address field corresponding to the transmission opportunity holder in the request frame is filled with an address of the AP, wherein the station is a station for obtaining channel access right, and the request frame is also used for indicating whether other stations receiving the request frame set the address of the transmission opportunity holder according to the address field corresponding to the transmission opportunity holder in the request frame;

6. The method according to claim 5, wherein the response frame includes an address field corresponding to the transmission opportunity holder, and the address field corresponding to the transmission opportunity holder in the response frame is filled with the address of the AP.

7. The method of claim 5 or 6, wherein the request frame further comprises: a first indication identifier, configured to indicate a location of an address field corresponding to a transmission opportunity holder in the request frame; and/or the presence of a gas in the gas,

8. The method of claim 5 or 6, wherein the request frame further comprises: a third indication identifier, configured to indicate whether to set an address corresponding to a transmission opportunity holder according to the request frame; and/or the presence of a gas in the gas,

9. A transmission opportunity holder changing method, comprising:

the AP replies a response frame to the station according to the request frame, wherein a time period identified by a duration field in the response frame is the sum of a time period corresponding to the transmission opportunity and a preset time period, the response frame carries an address field of a transmission opportunity holder, the address field of the transmission opportunity holder in the response frame is filled in the address field of the AP, and the response frame is further used for indicating whether other stations receiving the response frame set the address of the transmission opportunity holder according to the address field of the transmission opportunity holder included in the response frame.

10. The method according to claim 9, wherein the time period identified by the duration field in the response frame is a sum of a time period corresponding to the transmission opportunity and a preset time period, and specifically includes:

11. A station, comprising:

the transceiver is used for sending a request frame, the request frame comprises an address field corresponding to a transmission opportunity holder, and the address field corresponding to the transmission opportunity holder in the request frame is filled with an address of an Access Point (AP); receiving a response frame replied by the AP according to the request frame, wherein the request frame is also used for indicating whether other sites receiving the request frame set the address of the transmission opportunity holder according to an address field corresponding to the transmission opportunity holder included in the request frame;

wherein, the station is the station which obtains the channel access right.

12. The station according to claim 11, wherein the response frame includes an address field corresponding to the transmission opportunity holder, and the address field corresponding to the transmission opportunity holder in the response frame is filled with the address of the AP.

13. The station of claim 11 or 12, wherein the request frame further comprises: a first indication identifier, configured to indicate a location of an address field corresponding to a transmission opportunity holder in the request frame; and/or the presence of a gas in the gas,

14. The station of claim 11 or 12, wherein the request frame further comprises: a third indication identifier, configured to indicate whether to set an address corresponding to a transmission opportunity holder according to the request frame; and/or the presence of a gas in the gas,

15. An access point, AP, comprising:

the transceiver is used for receiving a request frame sent by a station, wherein the request frame comprises an address field corresponding to a transmission opportunity holder, and the address field corresponding to the transmission opportunity holder in the request frame is filled with the address of the AP, wherein the station is the station which obtains the channel access right; and sending a response frame to the station according to the request frame, wherein the request frame is also used for indicating whether other stations receiving the request frame set the address of the transmission opportunity holder according to the address field corresponding to the transmission opportunity holder included in the request frame.

16. The AP of claim 15, wherein the response frame includes an address field corresponding to a transmission opportunity holder, and wherein the address field corresponding to the transmission opportunity holder in the response frame fills an address of the AP.

17. The access point of claim 15 or 16, wherein the request frame further comprises: a first indication identifier, configured to indicate a location of an address field corresponding to a transmission opportunity holder in the request frame; and/or the presence of a gas in the gas,

18. The access point of claim 15 or 16, wherein the request frame further comprises: a third indication identifier, configured to indicate whether to set an address corresponding to a transmission opportunity holder according to the request frame; and/or the presence of a gas in the gas,

19. An access point, AP, comprising:

the transceiver is used for receiving a request frame sent by a station, wherein the request frame carries a time period corresponding to a transmission opportunity, and the station is a station for obtaining a channel access right; replying a response frame to the station according to the request frame, wherein a time period identified by a duration field in the response frame is the sum of a time period corresponding to the transmission opportunity and a preset time period, the response frame carries an address field of a transmission opportunity holder, the address field of the transmission opportunity holder in the response frame is filled in the address field of the AP, and the response frame is further used for indicating whether other stations receiving the response frame set the address of the transmission opportunity holder according to the address field of the transmission opportunity holder included in the response frame.

20. The access point according to claim 19, wherein the time period identified by the duration field in the response frame is a sum of the time period corresponding to the transmission opportunity and a preset time period, and specifically includes: