WO2016049886A1 - Channel sharing method, device, and system - Google Patents

Abstract

An embodiment of the present invention provides a channel sharing method. The method comprises: generating and sending a media access control (MAC) frame, wherein the MAC frame comprises a whitelist field and a duration field, the whitelist field comprises a network node list, the network node list is used for indicating one or more network nodes, the whitelist field is used for indicating that the one or more network nodes are allowed to set a network allocation vector (NAV) not according to the duration field of a received MAC frame, and the NAV is used for indicating the time when a current channel is occupied. Because the network node in the network node list can decide whether to participate in channel contention and data transmission according to the indication of the whitelist or the actual situation, the concurrency and multiplexing of a radio channel become possible, the number of regional concurrent links is increased and the network throughput is improved.

Description

Method, device and system for channel sharing Technical field

Embodiments of the present invention relate to communication technologies, and in particular, to a channel sharing method, apparatus, and system.

Background technique

In the wireless fidelity (English: Wireless Fidelity; Wi-Fi) based on the IEEE 802.11 protocol, the access control method of the wireless medium resource can be mainly divided into a point coordination function (English: Point Coordination Function; PCF). Distributed coordination function (English: Distributed Coordination Function; abbreviation: DCF). The PCF uses a contention-free mode, and all bandwidth allocations are controlled by a global node; the DCF uses a contention mechanism, and multiple distributed wireless nodes compete for the same resource. Currently, most Wi-Fi devices use the DCF mode.

In the DCF mode, the wireless medium, that is, the wireless channel, adopts a carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) mechanism. The CSMA/CA mechanism closely links the division of the time domain with the frame format, ensuring that only one site (English: station; abbreviation: STA) is transmitting at a certain time. Specifically, before the data is sent, the channel state is first monitored. If the channel continues to be idle for a period of time, random backoff is performed. If the backoff channel is still idle, data transmission is started, so that the possibility of contention conflict is greatly reduced.

DCF's rigorous carrier sensing mechanism maintains the "exclusive" and "exclusive" use of wireless channels, maximizing the protection of communications on the current link. However, this also greatly limits the use efficiency of channel resources. With the densification of network deployment and the increase of network load, this limitation has become a major bottleneck restricting network throughput and efficient application of Wi-Fi. Therefore, how to break the limitation of carrier sense has become one of the focuses of Wi-Fi standard discussion and technical research.

Summary of the invention

The embodiment of the invention provides a channel sharing method, device and system, which are beneficial to increase the number of concurrent links in a region and improve network throughput.

In a first aspect, an embodiment of the present invention provides a channel sharing method, where the channel sharing method includes:

Generating a medium access control MAC frame;

The MAC frame includes a whitelist field and a duration field;

The whitelist field includes a network node list, and the network node list is used to indicate one or more network nodes;

The whitelist field is configured to indicate that the one or more network nodes are allowed to not set a network allocation vector NAV according to the received duration field of the MAC frame, where the NAV is used to indicate a time when the current channel is to be occupied. .

In a second aspect, an embodiment of the present invention provides a channel sharing method, where the channel sharing method includes:

The network node receives the medium access control MAC frame;

The MAC frame includes a whitelist field and a duration field;

The whitelist field includes a network node list, and the network node list is used to indicate one or more network nodes;

The whitelist field is configured to indicate that the one or more network nodes are allowed to not set a network allocation vector NAV according to the received duration field of the MAC frame, where the NAV is used to indicate a time when the current channel is to be occupied. ;

Determining whether the network node is included in the network node list, and if it is included in the network node list, setting a network allocation vector NAV according to the received duration field of the MAC frame.

In a third aspect, an embodiment of the present invention provides a channel sharing apparatus, where the channel sharing apparatus includes:

a sending module, configured to generate a medium access control MAC frame;

The MAC frame includes a whitelist field and a duration field;

The whitelist field includes a network node list, and the network node list is used to indicate one or Multiple network nodes;

The whitelist field is configured to indicate that the one or more network nodes are allowed to not set a network allocation vector NAV according to the received duration field of the MAC frame, where the NAV is used to indicate a time when the current channel is to be occupied. .

In a fourth aspect, an embodiment of the present invention provides a channel sharing apparatus, where the channel sharing apparatus includes:

a receiving module, configured to receive, by the network node, a medium access control MAC frame;

The MAC frame includes a whitelist field and a duration field;

The whitelist field includes a network node list, and the network node list is used to indicate one or more network nodes;

The whitelist field is configured to indicate that the one or more network nodes are allowed to not set a network allocation vector NAV according to the received duration field of the MAC frame, where the NAV is used to indicate a time when the current channel is to be occupied. ;

a processing module, configured to determine whether the network node is included in the network node list, and if it is included in the network node list, not according to a duration of the MAC frame received by the receiving module The field sets the network allocation vector NAV.

In a fifth aspect, an embodiment of the present invention provides a channel sharing system, where the channel sharing system includes:

a first network node, configured to generate a medium access control MAC frame; the MAC frame includes a whitelist field and a duration field; the whitelist field includes a network node list, the network node list is used to indicate one or more networks a node; the whitelist field is configured to indicate that the one or more network nodes are allowed to not set a network allocation vector NAV according to the received duration field of the MAC frame, where the NAV is used to indicate that the current channel is to be occupied. time;

a second network node, configured to receive, by the network node, a medium access control MAC frame;

The MAC frame includes a whitelist field and a duration field; the whitelist field includes a network a network node list, the network node list is used to indicate one or more network nodes; the whitelist field is used to indicate that the one or more network nodes are allowed not to be based on the received duration duration of the MAC frame Setting a network allocation vector NAV, the NAV is used to indicate a time when the current channel is to be occupied; determining whether the network node is included in the network node list, and if it is included in the network node list, The network allocation vector NAV is set according to the received duration field of the MAC frame.

In the embodiment of the present invention, by sending a MAC frame, where the MAC frame includes a whitelist field and a duration field; the whitelist field includes a network node list; and the whitelist field indicates that the network node in the list of network nodes may not be received according to the received The duration field of the MAC frame sets the network allocation vector NAV, that is, the network node in the network node list can decide whether to participate in channel competition and data transmission according to the indication of the white list or the actual situation, which is the concurrency of the wireless channel. Multiplexing provides the possibility to increase the number of concurrent links in the area and increase network throughput.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the prior art or the embodiments will be briefly described below. Obviously, the drawings in the following description are only some implementations of the present invention. For example, other drawings may be obtained from those of ordinary skill in the art in light of the inventive work.

Figure 1 is a schematic diagram of NAV setup based on RTS/CTS mechanism;

2 is a schematic diagram of an IEEE 802.11 MAC frame format;

Figure 3 is a timing diagram of NAV setup based on RTS/CTS mechanism;

4 is a method of channel sharing on a transmitting side;

Figure 5a is a schematic diagram of an RTS frame format with a whitelist field;

Figure 5b is a schematic diagram of a CTS frame format containing a whitelist field;

Figure 5c is a schematic diagram of a format of a whitelist field;

6 is a schematic diagram of a format of a frame control field of a MAC frame header;

7 is a schematic diagram of a format of a whitelist field including condition information;

8 is a schematic diagram of a format of a whitelist field including condition information and indication bits;

Figure 9 is a schematic diagram of a mixed whitelist field format

FIG. 10 is a schematic diagram of a closed frame communication using a white list open frame and a white list;

11 is a schematic diagram of a frame format of a whitelist open frame or a whitelist closed frame;

Figure 12 is a method of channel sharing on the receiving side.

detailed description

The embodiment of the invention provides a channel sharing method, device and system, which are beneficial to increase the number of concurrent links in a region and improve network throughput.

In the existing DCF mode, the carrier sense used to determine the busy state of the channel is divided into physical carrier sensing (English: Physical Carrier Sensing; PCS) and virtual carrier sensing (English: Virtual Carrier Sensing; VCS) two ways. The results of the PCS are represented by the Clear Channel Assessment (CCA) results provided by the physical layer, and the CCA results can be based on the received energy detection (English: Energy Detection) and the received signal strength indication (English: Received Signal) Strength Indicator; referred to as: RSSI). When the CCA result is above a given threshold, the channel state is considered busy, otherwise it is idle. The VCS is configured by setting a network allocation vector (English: Network Allocation Vector; NAV) in the duration of the medium access control (English: Media Access Control; MAC) header. NAV can be understood as a timer (English: Timer), which is used to indicate how long the current channel needs to be occupied, and each monitored STA maintains a NAV timer. The value of NAV decreases over time. Before the value of NAV is reduced to zero, the STA will consider that the channel at this time is being occupied by other STAs to stop channel contention and data transmission. In data communication, the STA occupying the channel will inform the terminal through the Duration field in the header of various MAC messages. How long does his STA channel need to be occupied, and all other STAs that do not acquire channel usage rights compare the value of their own NAV with the Duration field in the received message, when the value of the time indicated by the Duration field is greater than its own At the NAV value, the STA's own NAV value will be set to the value of the time indicated by the received Duration.

Set the NAV information, for example, the time indicated by the Duration field, which can be carried in any MAC frame. Generally, it is sent by request (English: Request To Send; RTS)/Allow to send (English: Clear To Send; :CTS) This "handshake" type MAC control frame is used to propagate the NAV information. In addition, an ACK frame and an ACK (English: acknowledgment) frame are used, which is a report frame used by the receiving end as feedback for correct reception. As shown in Figure 1, after access point (AP: Access Point; AP) AP0 contends to the channel, it first sends an RTS request to the station STA0. At this time, other access points AP1 and other sites within the coverage of the AP0 signal. STA3 will set the value of its own NAV by comparing the Duration field in the RTS frame header; after STA0 receives the RTS from AP0, if its own channel state is idle, that is, the NAV value of STA0 is cleared, and If the CCA decision is idle, STA0 will reply CTS to AP0. At this time, the stations STA2 and STA3 which are within the coverage of the STA0 signal will update the value of the respective NAV by comparing the Duration field in the CTS frame header. Both AP0 and STA0 start real data transmission after successfully switching RTS/CTS signals. At this time, under the protection of NAV, AP1, STA2 and STA3 will remain silent, avoiding collisions, but this also limits AP1 and Communication of STA1, communication of STA2 and AP2.

It should be noted that if and only if the CCA result in the PCS is idle and the NAV timer count in the VCS is zero, the station will consider the channel idle and begin to attempt channel access. This mechanism limits the use efficiency of channel resources. With the dense network deployment and increased network load, this limitation has become a major bottleneck restricting network throughput and Wi-Fi efficient applications.

At present, the research on how to break the limitation of carrier sensing is limited to how to adjust the CCA decision threshold, and raise the probability of CCA idle by reasonably raising the CCA threshold, so that more stations can simultaneously occupy channel resources. Increase network throughput. However, only the CCA knot If it is idle, it is not enough. Only when the NAV in the VCS indicates that the channel is available, the station can compete and use the channel. This means that the NAV setup and update mechanism in VCS also needs to be changed to actually trigger more sites to occupy channel resources at the same time, increase the number of concurrent links, and increase network throughput.

In the IEEE 802.11 standard protocol, the frame header format definition of the MAC layer frame is as shown in FIG. 2. The Duration/ID field contains 16 bits of information. When the 16th bit is set to "0", the Duration/ID field is used as a Duration field, and the value of the specific time length is calculated according to the first 15 bits of the Duration field. The unit is microseconds. At this time, the Duration field indicates the time at which the currently performed transmission is expected to occupy the channel, and thus the NAV can be set according to the time indicated by the Duration field. For example, as shown in FIG. 3, the source network node sends an RTS frame and attempts to reserve channel usage rights for data transmission. Therefore, the source network node must calculate how long the channel needs to be occupied after the end of the RTS frame. Figure 3 illustrates that the entire data transmission process requires a total of three short interframe spaces (English: Short Interframe Space; SIFS) time, CTS frame duration, ACK frame duration, plus the time required to transmit data frames. The time required for transmission is calculated in microseconds and the Duration field is set in microseconds. If the result of the calculation is not an integer number of microseconds, it will be corrected to the next integer microsecond. The destination network node sends a CTS frame for answering the RTS, and the CTS frame can set the Duration field according to the time required after the end of the CTS frame to the end of the last ACK frame. Further, other network node frames that receive the RTS frame and the CTS may set respective NAVs according to the Duration field of the RTS frame and the CTS frame.

In addition, the network node in the embodiment of the present invention includes a STA, an AP, and the like, and may also be executed by other network entities. The embodiment of the present invention can be applied to a wireless fidelity (English: Wireless Fidelity; Wi-Fi) local area network, and can also be applied to other network systems. The MAC frame in the embodiment of the present invention may be an RTS or a CTS frame.

The embodiment of the present invention provides a method for adding a whitelist in a MAC layer frame to implement channel sharing. The network nodes listed in the whitelist are allowed to not set the NAV, and other network nodes not listed in the whitelist are set. NAV, which makes the information of setting NAV have certain pertinence, The network nodes that do not affect the current communication channel may not set the NAV, that is, the time indicated by the Duration field of the MAC frame header may occupy the channel, such as initiating channel access or data transmission, thereby increasing the number of concurrent links in the network. , thereby increasing network throughput.

For example, in the exemplary scenario shown in FIG. 1, during the communication between AP0 and STA0, stations AP1, STA2, and STA3 will remain silent without initiating channel access or data transmission. In this way, although the quality of the communication link between AP0 and STA0 can be effectively guaranteed, it also greatly limits the communication opportunities of other sites. In fact, STA0 is not within the signal coverage of AP1, and the transmission of AP1 does not affect the reception of STA0. Therefore, if AP1 is not set by the NAV from the RTS frame of AP0, it has the opportunity to also acquire the channel usage right to send data to STA1. Obviously, by adding a whitelist in the MAC layer frame, AP1 can ignore the NAV setting information of AP0 according to the white list, and send data to STA1, and the throughput of the network will increase. Similarly, STA0 is not within the signal coverage of AP2, and AP2 sending data to STA2 does not affect the reception of STA0. At this time, by adding a whitelist in the MAC layer frame, STA2 can ignore the NAV information of STA0 according to the white list, and reply the CTS frame to AP2, so that it can receive data from AP2, thereby increasing the network. Throughput.

In the embodiment of the present invention, the network allocation vector NAV of the network node is set according to the Duration field of the MAC frame received by the network node. Specifically, the frame header of the MAC frame includes a Duration field indicating the time of the current transmission occupied channel. When the network node receives the MAC frame, the network allocation vector NAV is set according to the indicated time of the field, and the time when the NAV indicates that the current channel is to be occupied is set to the time indicated by the Duration field. For example, the Duration field of the MAC frame indicates 100 microseconds. When the network node receives the MAC frame, if the channel indicated by the NAV of the network node is to be occupied for less than 100 microseconds, the NAV is updated to 100. The microsecond is such that the time indicated by the NAV is 100 microseconds. If the channel indicated by the NAV of the network node is to be occupied for more than or equal to 100 microseconds, the NAV does not have to be updated. In addition, any network node must monitor any MAC frame headers received and based on the MAC frame headers. The time indicated by the Duration field sets the NAV of the network node.

Embodiment 1:

FIG. 4 is a schematic diagram of a channel sharing method according to an embodiment of the present invention. The method may be performed by an AP or an STA. As shown in FIG. 4, the method includes:

Step 401: Generate a medium access control MAC frame.

Wherein, the MAC frame includes a whitelist field and a duration field;

Wherein, the MAC frame may be an RTS or a CTS frame;

The whitelist field includes a list of network nodes, and the list of network nodes is used to indicate one or more network nodes;

Step 402: Generate a MAC frame.

The whitelist field is used to indicate that one or more network nodes are allowed to not set the network allocation vector NAV according to the received duration field of the MAC frame, and can also be understood to indicate that one or more network nodes are allowed to receive. The channel is occupied in the time period indicated by the duration field of the MAC frame, such as initiating channel access or data transmission. This provides the possibility of concurrency and multiplexing of the wireless channel, which is beneficial to increase the number of concurrent links in the area and improve the network throughput.

Optionally, before step 401, the method further includes step 401a: listening for interference of one or more neighboring network nodes, determining whether one or more neighboring network nodes are included according to interference of the monitored neighboring network nodes. a list of network nodes in the whitelist field;

Specifically, the list of network nodes included in the whitelist field may be set according to the interference strength of the neighboring network node to the local network node.

Optionally, by monitoring the communication of the neighboring network node, the interference strength of the neighboring network node to the local network node is obtained, so that the network node can list the neighboring network nodes with less interference to the local network node into the white list of the network node. For example, the interference strength of the neighboring AP to the local station can be estimated by listening to the beacon (English: Beacon) frame from the neighboring AP, thereby Determine whether to include the neighboring AP in the whitelist of this site.

The list of network nodes included in the whitelist field can also be determined in various other ways, such as:

(1) The list of network nodes included in the whitelist field may be set according to the coverage of the network node;

Specifically, if the neighboring network node within the coverage of the network node has a bad judgment on the interference strength of the network node, the network node may also be included in the white list of the network node, and may attach one to the white list. Used as information for interference restrictions. For example, if the interference threshold that the network node can tolerate is written into the whitelist field, the network node in the whitelist may estimate its interference to the network node, and if the network node in the whitelist cannot interfere with the network node, If the limitation of the interference threshold of the network node is met, the neighboring network node in the whitelist also needs to set the NAV according to the received duration field of the MAC frame carrying the whitelist field.

(2) The whitelist field including the network node list may be set according to the cooperative network node of the local network node; specifically, for a group of network nodes that cooperate with each other, the mutually coordinated network nodes should be listed in each other's whitelist field A list of network nodes in .

Further, as shown in FIG. 5a and FIG. 5b, the list of network nodes in the whitelist field is specifically any one of the following: a MAC address list of one or more network nodes, or a list of identifiers of one or more network nodes. The MAC address of the network node may be the same MAC address as the RA field or the TA field, wherein the RA field indicates the MAC address of the receiving side network node, and the TA field indicates the MAC address of the transmitting side network node. Through the list of network nodes, such as the MAC address list of one or more network nodes, you can quickly identify which sites are whitelisted, so that the sites that are whitelisted can decide whether to ignore the NAV information according to the actual situation. .

For example, in the exemplary scenario shown in FIG. 1, AP0 may send the RTS frame shown in FIG. 5a, in which the address of AP1 is placed in the whitelist field. When AP1 receives the RTS frame and reads the whitelist field and finds that the address of AP1 is included, AP1 does not set or update the NAV. Similarly, STA0 can also reply to AP0 with the CTS frame shown in Figure 5b. Put the address of STA2 into the whitelist field. When STA2 receives the CTS frame and reads the whitelist field and finds that the address of STA2 is included, STA2 will also not set or update its NAV.

In addition, in order for the network node to be able to identify the RTS or CTS frame, a new frame type indication needs to be defined. The "Frame Control" field in Figure 2 contains various fields as shown in Figure 6. The Protocol Version indicates the protocol version; the To DS value is 1, indicating broadcast or multicast, the value is 0, indicating other communication methods; the value of From DS is 1, indicating broadcast or multicast, and the value is 0, indicating other communication. The value of More Fragments is 1, indicating that there is still a fragment to be transmitted, the value is 0, indicating that no fragment is to be transmitted; the value of Retry is 1, indicating retransmission, the value is 0, indicating no retransmission; Power Management means Power management mode; More Data indicates whether there is still data to be transmitted; Protected Frame indicates whether it is an encrypted or protected frame; Order indicates the service level. Among them, a 2-bit Type field and a 4-bit Subtype field are used to identify the type of the MAC frame. Therefore, the whitelisted RTS and CTS frames can adopt the same Type field as the existing RTS and CTS frames, that is, the B2B3=01 of the Type field, and the frame type of the RTS and CTS frames can be realized by enabling the reserved Subtype field. Indicates to distinguish from existing RTS and CTS frames.

Further, each network node in the list of network nodes included in the whitelist field has condition information corresponding thereto. The condition information may be power information, interference strength information, distance information, or location information. As shown in FIG. 7, compared to the whitelist field in FIG. 5c, the whitelist field in FIG. 7 includes not only a list of network nodes, for example, a list of MAC addresses or identifiers of one or more network nodes, but also Condition information corresponding to the MAC address or identifier of each network node, such as power information, interference strength information, distance information, or location information.

Specifically, the power information indicates the maximum transmit power that the corresponding network node can be allowed. The corresponding network node can limit its transmit power to the allowed maximum transmit power range by a certain power control method. When the corresponding network node cannot reach the condition indicated by the power information, for example, the transmit power of the corresponding network node is greater than the maximum transmit power indicated by the power information, the NAV is set according to the duration field, and the transmit power of the corresponding network node is Less than or equal For the maximum transmit power indicated by the power information, the NAV is not set according to the duration field.

Specifically, the interference strength information indicates a maximum interference strength that the corresponding network node can be allowed. The corresponding network node can limit its emission interference intensity to the allowed maximum interference intensity by a certain interference control method. When the corresponding network node cannot reach the condition indicated by the interference strength information, for example, the interference strength of the corresponding network node is greater than the maximum interference strength indicated by the interference strength information, the NAV is set according to the duration field, and the corresponding network node If the interference strength is less than or equal to the maximum interference strength indicated by the interference strength information, the NAV is not set according to the duration field.

Specifically, the distance information indicates the shortest distance that the corresponding network node can be allowed. When the corresponding network node cannot reach the condition indicated by the distance information, for example, the distance of the corresponding network node is less than the shortest distance indicated by the distance information, the NAV is set according to the duration field, and the distance of the corresponding network node is greater than or equal to The shortest distance indicated by the distance information does not set the NAV according to the duration field.

Specifically, the location information indicates the closest location that the corresponding network node can be allowed. When the corresponding network node cannot reach the condition indicated by the location information, for example, the location of the corresponding network node is within the location range indicated by the location information, the NAV is set according to the duration field, and the location of the corresponding network node is not located. Within the location range indicated by the information, the NAV is not set according to the duration field.

By utilizing the condition information in the whitelist field, the interference between network nodes can be flexibly controlled, so that the network node can perform interference control more accurately, thereby reducing interference to other network nodes and increasing the capacity of system communication.

Further, in order to effectively distinguish the two whitelists carrying the condition information and the non-conditional information, the MAC frame frame header includes an indication bit for indicating whether the whitelist field includes the condition information; when the indication bit is the first value The whitelist field contains condition information; when the indication bit is the second value, the whitelist field does not contain condition information. Wherein, the indication bit is not limited to one bit, and may also be It is assumed that a plurality of bits are, as in the Subtype field in the following mode (2). Specifically, there are two ways:

(1) The 12th bit in Fig. 6, that is, the B12-Power Management information bit, is used to indicate whether or not condition information is included. When B12=1, it indicates the whitelist field format as shown in FIG. 7; when B12=0, it indicates the whitelist field format as shown in FIG. 5c. At this time, the frame types corresponding to the two white lists of FIG. 5c and FIG. 7 are the same.

(2) Different frame types are defined for the frames including the two white lists of FIG. 5c and FIG. 7, for example, the different values are set by the Subtype field in FIG. 6 to distinguish the white list shown in FIG. 5c and the white list shown in FIG. Whitelisted frames.

Optionally, the whitelist format shown in FIG. 7 is extended. As shown in FIG. 8, an extended bit (English: Power Control Indicator; PCI) is introduced in the whitelist field. If the extended bit is 1, it indicates There will be conditional information thereafter; otherwise, there will be no conditional information, but the next site address. The condition information at this time is optional for each network node. Further, the PCI can be used to form a hybrid whitelist field, that is, a network node in a part of the whitelist does not have corresponding condition information, and a network node in another part of the whitelist has corresponding condition information. As shown in FIG. 9, the PCI of the first part of the network node (network node 1 to network node n) in the whitelist field is 0, and there is no condition information; the latter part of the network node (network node n+1 to network node m) corresponds to The PCI is 1, with conditional information. Where n and m are positive integers, and m is greater than or equal to n.

Further, the whitelist field needs to be specified as a valid time, which is called the effective time of the whitelist field. When the whitelist field is valid, the network node should consider performing a corresponding operation according to the whitelist field; When the whitelist field is valid, the network node ignores the information indicated by the whitelist field and operates according to the existing method. At this time, the effective time of the whitelist is specified, so that the whitelist plays its role within a prescribed time, and unnecessary operation instructions can be prevented. For example, when the whitelist indicates that the network node receiving the whitelist performs power control, the whitelist is valid. The time can limit the time of the power control to the time. After this period of time, without limiting the power, the normal transmission of the network node can be ensured, so that the data rate is increased and the coverage is increased.

Optionally, the validity time of the whitelist field is consistent with the time indicated by the Duration field carried in the MAC frame transmitting the whitelist, that is, the Duration field of the MAC frame indicates the valid time of the whitelist field. As shown in Figure 1, AP1 and STA2 need to maintain a whitelist timer, and record the time indicated by the Duration field sent with the whitelist field. When this time is decremented to zero, AP1 and STA2 will no longer consider themselves to be It is included in the whitelist from AP0 and STA0. In addition, if one network node belongs to the white list of other multiple network nodes, it needs to record the effective time of multiple whitelist fields corresponding to multiple network nodes that send whitelists.

Optionally, this embodiment introduces two new MAC control frames: a whitelist open frame and a whitelist closed frame. When the network node receives the whitelist open frame, and the network node is in the whitelist field of the whitelist open frame, the whitelist field is valid; when the network node receives the whitelisted closed frame, and the network node is in the white If the list is closed in the whitelist field of the frame, the whitelist field is invalid.

That is, the whitelist field of the whitelist open frame indicates that all one or more sites ignore the Duration information in the MAC frame header sent by the whitelist open frame sending station until the whitelisted open frame is received. The whitelisted closed frame sent by the sending site, and the one or more sites are listed in the whitelisted field of the whitelisted open frame. By defining a new white MAC frame type, such as a whitelist open frame and a whitelist closed frame, the validity period of the whitelist field is no longer bound to the duration of the frame header, and a longer period whitelist setting is implemented, thereby avoiding repetition. The overhead of sending the same whitelist.

For example, as shown in FIG. 10, two adjacent APs, AP1 and AP2, are taken as an example. Assuming that AP2 can control interference to AP1 through techniques such as power control or directional beamforming, AP1 can include AP2 in its whitelist. Since AP2 is relatively fixed in location and its interference to AP1 is relatively fixed, AP2 can be listed in the whitelist for a long period of time. AP1 does not need to frequently notify AP2 through RTS or CTS frames. Based on this, the present invention is utilized The whitelisted open frame and the whitelisted closed frame provided by the embodiment are used to set the effective time of the whitelisted field. AP2 receives the whitelisted open frame from AP1, and AP2 is listed in the whitelist field of the whitelisted open frame. Then AP2 can ignore the information of all the Duration fields in the frame header of the MAC frame from AP1. When the whitelist close frame from AP1 is closed and AP2 is listed in the whitelist field of the whitelist close frame, then AP2 may not ignore the information of all the Duration fields in the MAC frame header from AP1.

Figure 11 shows a frame format of a whitelist open frame or a whitelist closed frame. The format of the whitelist open frame and the whitelist closed frame may be the same, and the difference is that their frame types are different, and thus need to be white. The list-opening frame and the whitelist-off corresponding frame type indication may use one or more bits in the MAC frame header as a switch indication bit to indicate whether the whitelist field is valid, that is, whether the MAC frame is a whitelist open frame or The whitelist closes the frame. When the switch indication bit is the first value, the whitelist field is valid, that is, the MAC frame is a whitelist open frame; when the switch indication bit is the second value, the whitelist field is invalid, that is, the MAC frame is whitelisted off. frame. Specifically, it can be implemented by a 2-bit Type field and a 4-bit Subtype field reserved in the existing standard.

In the embodiment of the present invention, a plurality of new frame types are provided, including: an RTS frame, a CTS frame, a whitelisted open frame, and a whitelisted closed frame, wherein a frame format and an RTS frame of a whitelisted open frame or a whitelisted closed frame are provided. Or the frame format of the CTS frame may be the same, and the Type field and the Subtype field of the frame header are used to distinguish the frame types. In addition, the white list in the frames is divided into conditional information and conditional information. It is mentioned above that the Type field and the Subtype field can be used to indicate these frame types in the embodiment of the present invention, as shown in Table 1, for example:

Table 1 New MAC frame types indicated by the Type field and the Subtype field

Specifically, the format of the whitelist field of the four new MAC frames provided by the embodiment of the present invention in Table 1 may be any one of the formats shown in FIG. 5c and FIG. 7-9.

Embodiment 2:

FIG. 12 is a schematic diagram of a channel sharing method according to an embodiment of the present invention. The method may be performed by an AP or an STA. As shown in FIG. 12, the method includes:

Step 1201: The network node receives the medium access control MAC frame.

Wherein, the MAC frame includes a whitelist field and a duration field;

The whitelist field includes a list of network nodes, and the list of network nodes is used to indicate one or more network nodes;

The whitelist field is used to indicate that one or more network nodes are allowed to not set the network allocation vector NAV according to the received duration field of the MAC frame, wherein the NAV is used to indicate the time when the current channel is to be occupied;

The network node list is specifically in any one of the following manners: one or more network nodes A list of MAC addresses, or a list of identifiers for one or more network nodes.

Step 1202: Determine whether the network node is included in the network node list. If it is included in the network node list, the network allocation vector NAV is not set according to the received duration field of the MAC frame.

Further, if the network node is not included in the network node list, the network node sets the NAV according to the Duration field of the MAC frame header;

Further, the whitelist field further includes condition information corresponding to the one or more network nodes; wherein the condition information is used to indicate that one or more network nodes do not set a condition of the NAV according to a duration field of the MAC frame. The condition information is power information, interference strength information, distance information, or location information. With the condition information, the restriction of the network node selection in the whitelist can be relaxed, so that more network nodes have the opportunity to be whitelisted, thereby increasing the concurrent opportunities and the number of network throughput.

Optionally, when the whitelist field contains condition information, the network node sets the NAV according to the Duration field and the condition information. Specifically, if the network node is included in the network node list and meets the condition indicated by the condition information, the network node does not set the NAV according to the Duration field; if the network node does not satisfy the condition indicated by the condition information, the network node according to the Duration The field sets NAV.

Further, when the whitelist field does not contain the condition information, the network node is included in the network node list, and the network node does not set the NAV according to the Duration field.

Optionally, the MAC frame frame header includes an indication bit for indicating whether the whitelist field includes condition information; when the indication bit is the first value, the whitelist field includes condition information; when the indication bit is the second value, the whitelist The field does not contain condition information. Specifically, the indication bit is a power management bit or a bit of a subtype field of a frame control field of a MAC frame header.

Optionally, the whitelist field further includes an extended bit corresponding to one or more network nodes; when the extended bit is the first value, the network node corresponding to the extended bit has corresponding condition information; When the extended bit is the second value, the network node corresponding to the extended bit does not have corresponding condition information.

Further, the whitelist field specifies an active time, which is called the effective time of the whitelist field. When the whitelist field is valid, the network node considers the information indicated by the whitelist field; when not in the whitelist field During the valid time, the network node ignores the information indicated by the whitelist field and operates according to the existing mode. At this time, the effective time of the whitelist is specified, so that the whitelist plays its role within a prescribed time, and unnecessary operation instructions can be prevented. For example, when the whitelist indicates that the network node that receives the whitelist performs power control, the effective time of the whitelist may limit the time of the power control to the time. After the period of time, without limiting the power, the network node may be guaranteed. Normal transmission, so that the data rate is increased and the coverage is increased.

Further, the effective time of the whitelist field in the MAC frame received by the network node may be determined by:

Optionally, the network node records the information of the Duration field of the MAC frame header, and uses the time indicated by the Duration field as the effective time of the whitelist field. Specifically, the timer whose startup duration is the length of time indicated by the Duration field, when the timer counts to zero, the network node will no longer consider itself to belong to the whitelist corresponding to the duration;

Optionally, the MAC frame includes a switch indication bit; specifically, one or more bits in the MAC frame frame header are used as switch indication bits to indicate whether the whitelist field is valid. When the switch indication bit is the first value, the whitelist field is valid; when the switch indication bit is the second value, the whitelist field is invalid.

Specifically, when the switch indication bit is the first value, the network node does not need to record the information of the Duration field of the MAC frame header, and the network node also ignores the information of the Duration field of the MAC frame header of the network node that sends the white list. In this way, the network node does not need to set the NAV;

Optionally, when the switch indication bit is the second value, the network node records the information of the Duration field of the MAC frame header, and sets the NAV according to the Duration field; at the same time, the network node will no longer continue to ignore the network from the whitelist. Information about the Duration field of the node.

By adding a whitelist to the MAC layer frame, the network nodes listed in the whitelist are allowed to not set the NAV, and other network nodes not listed in the whitelist are required to set the NAV, so that the information for setting the NAV has a certain target. So that those network nodes that do not affect the current communication channel may not set the NAV, that is, the time indicated by the Duration field of the MAC frame header may occupy the channel, such as initiating channel access or data transmission, thereby increasing the concurrent link in the network. Number, which in turn increases network throughput.

Some of the technical features involved, such as a whitelist field, a duration field, a NAV, condition information, and a valid time of the whitelist, are similar or corresponding to some technical features involved in the foregoing method embodiments, and the embodiment is no longer Repeat the instructions.

In addition, the medium access control MAC frame is a request to send an RTS frame or to allow transmission of a CTS frame. The method can run on a wireless fidelity WiFi LAN.

Corresponding to the above method embodiment, the embodiment of the present invention further provides a channel sharing device, as shown in FIG. 13, including:

a generating module 1303, configured to generate a medium access control MAC frame;

The MAC frame includes a whitelist field and a duration field; the whitelist field includes a network node list, the network node list is used to indicate one or more network nodes; and the whitelist field is used to indicate that one or more network nodes are allowed not to be based on The duration field of the received MAC frame sets a network allocation vector NAV, which is used to indicate the time when the current channel is to be occupied;

The sending module 1304 is configured to send the generated MAC frame.

Further, the device further includes:

The monitoring module 1301 is configured to monitor interference of one or more adjacent network nodes,

The determining module 1302 is configured to determine, according to interference of neighboring network nodes monitored by the listening module 1301, whether one or more neighboring network nodes are listed in the network node list in the whitelist field.

Some of the technical features involved, such as: whitelist field, duration field, NAV, The conditional information, the effective time of the whitelist, and the like are similar or corresponding to some of the technical features involved in the foregoing method embodiments, and the description is not repeated in this embodiment.

Corresponding to the above method embodiment, the embodiment of the present invention further provides a channel sharing device, as shown in FIG.

The receiving module 1401 is configured to receive, by the network node, a medium access control MAC frame.

The MAC frame includes a whitelist field and a duration field; the whitelist field includes a network node list, the network node list is used to indicate one or more network nodes; and the whitelist field is used to indicate that one or more network nodes are allowed not to be based on The duration field of the received MAC frame sets a network allocation vector NAV, which is used to indicate the time when the current channel is to be occupied;

The processing module 1402 is configured to determine whether the network node is included in the network node list, and if it is included in the network node list, set the network allocation vector NAV according to the duration field of the MAC frame received by the receiving module.

Further, the MAC frame includes a switch indication bit; wherein the switch indication bit is used to indicate whether the whitelist field is valid; when the switch indication bit is the first value, the whitelist field is valid; when the switch indication bit is the second value The whitelist field is invalid.

Further, the processing module 1402 is further configured to:

When the switch indication bit is the first value, the network node does not set the NAV according to the duration field of all the MAC frames of the network node that sends the MAC frame;

When the switch indication bit is the second value, the network node sets the NAV according to the duration field of all MAC frames of the network node transmitting the MAC frame.

Some of the technical features involved, such as a whitelist field, a duration field, a NAV, condition information, and a valid time of the whitelist, are similar or corresponding to some technical features involved in the foregoing method embodiments, and the embodiment is no longer Repeat the instructions.

An embodiment of the present invention provides a channel sharing device, as shown in FIG. 15, including: a processor 1501, a memory 1502, a transmitter 1504, and a bus 1503, wherein the processor 1501, the memory 1502, and the transmitter 1504 are connected by a bus 1503. Data transmission, the memory 1502 is configured to store data processed by the processor 1501;

The bus 1503 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus. Etc., here is not limited. The bus 1504 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 15, but it does not mean that there is only one bus or one type of bus. among them:

The memory 1502 is configured to store data or executable program code, where the program code includes computer operating instructions, which may specifically be: an operating system, an application, or the like. The memory 1502 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory.

The processor 1501 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more configured to implement the embodiments of the present invention. integrated circuit.

The processor 1501 is configured to implement the aggregate frame transmission method of the STA side downlink processing procedure in the above embodiment by executing the program code in the memory 1502.

Specifically include:

The transmitter 1504 is configured to send a medium access control MAC frame;

The MAC frame includes a whitelist field and a duration field; the whitelist field includes a network node list, the network node list is used to indicate one or more network nodes; and the whitelist field is used to indicate that one or more network nodes are allowed not to be based on The duration field of the received MAC frame sets a network allocation vector NAV, which is used to indicate the time when the current channel is to be occupied;

The processor 1501 is configured to generate a MAC frame transmitted by the transmitter 1504.

Further, the processor 1501 is further configured to:

Listening for interference from one or more neighboring network nodes,

Based on the interference of the monitored neighboring network nodes, it is determined whether one or more neighboring network nodes are listed in the network node list in the whitelist field.

Some of the technical features involved, such as a whitelist field, a duration field, a NAV, condition information, and a valid time of the whitelist, are similar or corresponding to some technical features involved in the foregoing method embodiments, and the embodiment is no longer Repeat the instructions.

An embodiment of the present invention provides a network node for channel sharing. Referring to FIG. 16, the system includes: a processor 1601, a memory 1602, a receiver 1604, and a bus 1603. The processor 1601, the memory 1602, the receiver 1604, and the 1603 is connected for data transmission, and the memory 1602 is used for storing data processed by the processor 1601;

The bus 1603 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus. Etc., here is not limited. The bus 1603 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 16, but it does not mean that there is only one bus or one type of bus. among them:

The memory 1602 is configured to store data or executable program code, where the program code includes computer operating instructions, specifically: an operating system, an application, and the like. The memory 1602 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory.

The processor 1601 may be a central processing unit (CPU) or an application specific integrated circuit (Application Specific Integrated Circuit, referred to as ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.

The processor 1601 is configured to implement the aggregate frame transmission method of the STA side uplink processing procedure in the above embodiment by executing the program code in the memory 1602.

Specifically include:

The receiver 1604 is configured to receive a medium access control MAC frame;

The MAC frame includes a whitelist field and a duration field; the whitelist field includes a network node list, the network node list is used to indicate one or more network nodes; and the whitelist field is used to indicate that one or more network nodes are allowed not to be based on The duration field of the received MAC frame sets a network allocation vector NAV, which is used to indicate the time when the current channel is to be occupied;

The processor 1601 is configured to determine whether the network node is included in the network node list, and if it is included in the network node list, the network allocation vector NAV is not set according to the duration field of the MAC frame received by the receiver 1604.

Further, the MAC frame includes a switch indication bit; wherein the switch indication bit is used to indicate whether the whitelist field is valid; when the switch indication bit is the first value, the whitelist field is valid; when the switch indication bit is the second value The whitelist field is invalid.

Further, the processor 1601 is further configured to:

When the switch indication bit is the first value, the network node does not set the NAV according to the duration field of all the MAC frames of the network node that sends the MAC frame;

When the switch indication bit is the second value, the network node sets the NAV according to the duration field of all MAC frames of the network node transmitting the MAC frame.

Some of the technical features involved, such as a whitelist field, a duration field, a NAV, condition information, and a valid time of the whitelist, are similar or corresponding to some technical features involved in the foregoing method embodiments, and the embodiment is no longer Repeat the instructions.

Embodiments of the present invention provide an aggregation frame transmission system, where the system includes the following figure. The apparatus of Figure 13 and the apparatus of Figure 14 are used to perform the methods provided by embodiments of the present invention.

Those of ordinary skill in the art will appreciate that various aspects of the present invention, or possible implementations of various aspects, may be embodied as a system, method, or computer program product. Thus, aspects of the invention, or possible implementations of various aspects, may be in the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, etc.), or a combination of software and hardware aspects, They are collectively referred to herein as "circuits," "modules," or "systems." Furthermore, aspects of the invention, or possible implementations of various aspects, may take the form of a computer program product, which is a computer readable program code stored in a computer readable medium.

The computer readable medium can be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium includes, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing, such as random access memory (RAM), read only memory (ROM), Erase programmable read-only memory (EPROM or flash memory), optical fiber, portable read-only memory (CD-ROM).

The processor in the computer reads the computer readable program code stored in the computer readable medium such that the processor is capable of performing the various functional steps specified in each step of the flowchart, or a combination of steps; A device that functions as specified in each block, or combination of blocks.

The computer readable program code can execute entirely on the user's computer, partly on the user's computer, as a separate software package, partly on the user's computer and partly on the remote computer, or entirely on the remote computer or server. . It should also be noted that in some alternative implementations, the functions noted in the various steps in the flowcharts or in the blocks in the block diagrams may not occur in the order noted. For example, two steps, or two blocks, shown in succession may be executed substantially concurrently or the blocks may be executed in the reverse order.

One of ordinary skill in the art will recognize that each of the embodiments described herein in connection with the embodiments disclosed herein The exemplary unit and algorithm steps can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims (67)

1. A channel sharing method, comprising:

   Generating a medium access control MAC frame;

   The MAC frame includes a whitelist field and a duration field;

   The whitelist field includes a network node list, and the network node list is used to indicate one or more network nodes;

   The whitelist field is configured to indicate that the one or more network nodes are allowed to not set a network allocation vector NAV according to the received duration field of the MAC frame, where the NAV is used to indicate a time when the current channel is to be occupied. ;

   Send the MAC frame.
2. The method of claim 1 wherein

   The whitelist field further includes condition information corresponding to the one or more network nodes;

   The condition information is used to indicate that the one or more network nodes do not set a condition of the NAV according to a duration field of the MAC frame.
3. The method of claim 2 wherein:

   The condition information is any one of the following: power information, interference strength information, distance information, and location information.
4. Method according to claim 2 or 3, characterized in that

   The MAC frame frame header includes an indication bit for indicating whether the whitelist field includes the condition information;

   When the indication bit is the first value, the whitelist field includes the condition information;

   When the indication bit is the second value, the whitelist field does not include the condition information.
5. The method of claim 4 wherein:

   The indication bit is a bit of a power management bit or a subtype field of a frame control field of the MAC frame header.
6. Method according to claim 2 or 3, characterized in that

   The whitelist field further includes an extended bit corresponding to the one or more network nodes;

   When the extended bit is the first value, the network node corresponding to the extended bit has corresponding condition information;

   When the extended bit is the second value, the network node corresponding to the extended bit does not have corresponding condition information.
7. A method according to any one of claims 1 to 6, wherein

   The duration field is also used to indicate the effective time of the whitelist field.
8. A method according to any one of claims 1 to 6, wherein

   The MAC frame includes a switch indication bit;

   The switch indication bit is used to indicate whether the whitelist field is valid;

   When the switch indication bit is the first value, the whitelist field is valid;

   When the switch indicates that the bit is the second value, the whitelist field is invalid.
9. The method according to any one of claims 1 to 8, comprising:

   Listening for interference from one or more neighboring network nodes,

   Determining whether the one or more neighboring network nodes are included in the list of network nodes in the whitelist field according to the interference of the neighboring network nodes that are monitored.
10. A method according to any one of claims 1 to 9, wherein

    The medium access control MAC frame is a request to send an RTS frame or to allow a CTS frame to be transmitted.
11. A method according to any one of claims 1 to 10, characterized in that

    The method operates on a wireless fidelity Wi-Fi local area network.
12. A channel sharing method, comprising:

    The network node receives the medium access control MAC frame;

    The MAC frame includes a whitelist field and a duration field;

    The whitelist field includes a network node list, and the network node list is used to indicate one or Multiple network nodes;

    The whitelist field is configured to indicate that the one or more network nodes are allowed to not set a network allocation vector NAV according to the received duration field of the MAC frame, where the NAV is used to indicate a time when the current channel is to be occupied. ;

    Determining whether the network node is included in the network node list, and if it is included in the network node list, setting a network allocation vector NAV according to the received duration field of the MAC frame.
13. The method of claim 12 wherein:

    The whitelist field further includes condition information corresponding to the one or more network nodes;

    The condition information is used to indicate that the one or more network nodes do not set a NAV condition according to a duration field of the MAC frame;

    Determining whether the network node is included in the network node list, if it is included in the network node list, setting a network allocation vector NAV according to the received duration field of the MAC frame, specifically for:

    Determining whether the network node is included in the network node list, if included in the network node list and satisfying a condition indicated by the condition information, not according to the received duration of the MAC frame The field sets the network allocation vector NAV.
14. The method of claim 13 wherein:

    The condition information is any one of the following: power information, interference strength information, distance information, and location information.
15. Method according to claim 13 or 14, characterized in that

    The MAC frame frame header includes an indication bit for indicating whether the whitelist field includes the condition information;

    When the indication bit is the first value, the whitelist field includes the condition information;

    When the indication bit is the second value, the whitelist field does not include the condition information.
16. The method of claim 15 wherein:

    The indication bit is a bit of a power management bit or a subtype field of a frame control field of the MAC frame header.
17. Method according to claim 13 or 14, characterized in that

    The whitelist field further includes an extended bit corresponding to the one or more network nodes;

    When the extended bit is the first value, the network node corresponding to the extended bit has corresponding condition information;

    When the extended bit is the second value, the network node corresponding to the extended bit does not have corresponding condition information.
18. A method according to any one of claims 12 to 17, wherein

    The duration field is further used to indicate a valid time of the whitelist field;

    Determining whether the network node is included in the network node list, if it is included in the network node list, setting a network allocation vector NAV according to the received duration field of the MAC frame, specifically for:

    Determining whether the network node is included in the network node list, and if it is included in the network node list and satisfying that the current time is still within the valid time, not according to the received MAC frame duration The time field sets the network allocation vector NAV.
19. A method according to any one of claims 12 to 17, wherein

    The MAC frame includes a switch indication bit;

    The switch indication bit is used to indicate whether the whitelist field is valid;

    When the switch indication bit is the first value, the whitelist field is valid;

    When the switch indication bit is the second value, the whitelist field is invalid;

    Determining whether the network node is included in the network node list, if it is included in the network node list, setting a network allocation vector NAV according to the received duration field of the MAC frame, specifically for:

    Determining whether the network node is included in the list of network nodes, if included in the When the network node list is valid and the whitelist field is valid, the network allocation vector NAV is not set according to the received duration field of the MAC frame.
20. The method of claim 19, wherein the method further comprises:

    When the switch indication bit is the first value, the network node does not set the NAV according to a duration field of all MAC frames of the network node that sends the MAC frame;

    When the switch indication bit is the second value, the network node sets the NAV according to a duration field of all MAC frames of the network node transmitting the MAC frame.
21. A method according to any one of claims 12 to 20, wherein

    The medium access control MAC frame is a request to send an RTS frame or to allow a CTS frame to be transmitted.
22. A method according to any one of claims 12 to 21, wherein

    The method operates on a wireless fidelity Wi-Fi local area network.
23. A channel sharing device, comprising:

    Generating a module for generating a medium access control MAC frame;

    The MAC frame includes a whitelist field and a duration field;

    The whitelist field includes a network node list, and the network node list is used to indicate one or more network nodes;

    The whitelist field is configured to indicate that the one or more network nodes are allowed to not set a network allocation vector NAV according to the received duration field of the MAC frame, where the NAV is used to indicate a time when the current channel is to be occupied. ;

    And a sending module, configured to send the MAC frame.
24. The device according to claim 23, wherein

    The whitelist field further includes condition information corresponding to the one or more network nodes;

    The condition information is used to indicate that the one or more network nodes do not set a condition of the NAV according to a duration field of the MAC frame.
25. The device according to claim 24, wherein

    The condition information is any one of the following: power information, interference strength information, distance information, and location information.
26. Device according to claim 24 or 25, characterized in that

    The MAC frame frame header includes an indication bit for indicating whether the whitelist field includes the condition information;

    When the indication bit is the first value, the whitelist field includes the condition information;

    When the indication bit is the second value, the whitelist field does not include the condition information.
27. The device of claim 26, wherein

    The indication bit is a bit of a power management bit or a subtype field of a frame control field of the MAC frame header.
28. Device according to claim 24 or 25, characterized in that

    The whitelist field further includes an extended bit corresponding to the one or more network nodes;

    When the extended bit is the first value, the network node corresponding to the extended bit has corresponding condition information;

    When the extended bit is the second value, the network node corresponding to the extended bit does not have corresponding condition information.
29. A device according to any one of claims 23 to 28, characterized in that

    The duration field is also used to indicate the effective time of the whitelist field.
30. A device according to any one of claims 23 to 28, characterized in that

    The MAC frame includes a switch indication bit;

    The switch indication bit is used to indicate whether the whitelist field is valid;

    When the switch indication bit is the first value, the whitelist field is valid;

    When the switch indicates that the bit is the second value, the whitelist field is invalid.
31. The device according to any one of claims 23 to 30, wherein the device further comprises:

    a monitoring module for monitoring interference of one or more adjacent network nodes,

    And a determining module, configured to determine, according to interference of the neighboring network node that the monitoring module monitors, whether the one or more neighboring network nodes are included in the list of network nodes in the whitelist field.
32. A device according to any one of claims 23 to 31, wherein

    The medium access control MAC frame is a request to send an RTS frame or to allow a CTS frame to be transmitted.
33. A device according to any one of claims 23 to 32, wherein

    The device operates on a wireless fidelity Wi-Fi local area network.
34. A channel sharing device, comprising:

    a receiving module, configured to receive, by the network node, a medium access control MAC frame;

    The MAC frame includes a whitelist field and a duration field;

    The whitelist field includes a network node list, and the network node list is used to indicate one or more network nodes;

    The whitelist field is configured to indicate that the one or more network nodes are allowed to not set a network allocation vector NAV according to the received duration field of the MAC frame, where the NAV is used to indicate a time when the current channel is to be occupied. ;

    a processing module, configured to determine whether the network node is included in the network node list, and if it is included in the network node list, not according to a duration of the MAC frame received by the receiving module The field sets the network allocation vector NAV.
35. The device of claim 34, wherein

    The whitelist field further includes condition information corresponding to the one or more network nodes;

    The condition information is used to indicate that the one or more network nodes do not set a NAV condition according to a duration field of the MAC frame;

    Determining whether the network node is included in the network node list, if it is included in the network node list, setting a network allocation vector NAV according to the received duration field of the MAC frame, specifically for:

    Determining whether the network node is included in the list of network nodes, if included in the When the network node list is satisfied and the condition indicated by the condition information is satisfied, the network allocation vector NAV is not set according to the received duration field of the MAC frame.
36. The device of claim 35, wherein

    The condition information is any one of the following: power information, interference strength information, distance information, and location information.
37. A device according to claim 35 or 36, wherein

    The MAC frame frame header includes an indication bit for indicating whether the whitelist field includes the condition information;

    When the indication bit is the first value, the whitelist field includes the condition information;

    When the indication bit is the second value, the whitelist field does not include the condition information.
38. The device according to claim 37, wherein

    The indication bit is a bit of a power management bit or a subtype field of a frame control field of the MAC frame header.
39. A device according to claim 35 or 36, wherein

    The whitelist field further includes an extended bit corresponding to the one or more network nodes;

    When the extended bit is the first value, the network node corresponding to the extended bit has corresponding condition information;

    When the extended bit is the second value, the network node corresponding to the extended bit does not have corresponding condition information.
40. A device according to any one of claims 34 to 39, wherein

    The duration field is further used to indicate a valid time of the whitelist field;

    Determining whether the network node is included in the network node list, if it is included in the network node list, setting a network allocation vector NAV according to the received duration field of the MAC frame, specifically for:

    Determining whether the network node is included in the list of network nodes, if included in the When the network node list is in the description and the current time is still within the valid time, the network allocation vector NAV is not set according to the received duration field of the MAC frame.
41. A device according to any one of claims 34 to 39, wherein

    The MAC frame includes a switch indication bit;

    The switch indication bit is used to indicate whether the whitelist field is valid;

    When the switch indication bit is the first value, the whitelist field is valid;

    When the switch indication bit is the second value, the whitelist field is invalid;

    Determining whether the network node is included in the network node list, if it is included in the network node list, setting a network allocation vector NAV according to the received duration field of the MAC frame, specifically for:

    Determining whether the network node is included in the network node list, if it is included in the network node list and the whitelist field is valid, not setting a network according to the received duration field of the MAC frame Assign vector NAV.
42. The device according to claim 41, wherein the processing module is further configured to:

    When the switch indication bit is the first value, the network node does not set the NAV according to a duration field of all MAC frames of the network node that sends the MAC frame;

    When the switch indication bit is the second value, the network node sets the NAV according to a duration field of all MAC frames of the network node transmitting the MAC frame.
43. A device according to any one of claims 34 to 42, wherein

    The medium access control MAC frame is a request to send an RTS frame or to allow a CTS frame to be transmitted.
44. Apparatus according to any one of claims 34 to 43 wherein:

    The device operates on a wireless fidelity Wi-Fi local area network.
45. A channel sharing device, comprising: a processor, a memory, a transmitter, and a bus, wherein the processor, the memory, and the transmitter transmit data through the bus connection, and the memory is configured to store the processing Data processed by the device;

    The processor is configured to generate the MAC frame sent by the transmitter;

    The transmitter is configured to generate a medium access control MAC frame;

    The MAC frame includes a whitelist field and a duration field;

    The whitelist field includes a network node list, and the network node list is used to indicate one or more network nodes;

    The whitelist field is configured to indicate that the one or more network nodes are allowed to not set a network allocation vector NAV according to the received duration field of the MAC frame, where the NAV is used to indicate a time when the current channel is to be occupied. .
46. The device according to claim 45, characterized in that

    The whitelist field further includes condition information corresponding to the one or more network nodes;

    The condition information is used to indicate that the one or more network nodes do not set a condition of the NAV according to a duration field of the MAC frame.
47. The device according to claim 46, wherein

    The condition information is any one of the following: power information, interference strength information, distance information, and location information.
48. Device according to claim 46 or 47, characterized in that

    The MAC frame frame header includes an indication bit for indicating whether the whitelist field includes the condition information;

    When the indication bit is the first value, the whitelist field includes the condition information;

    When the indication bit is the second value, the whitelist field does not include the condition information.
49. The device according to claim 48, wherein

    The indication bit is a bit of a power management bit or a subtype field of a frame control field of the MAC frame header.
50. Device according to claim 46 or 47, characterized in that

    The whitelist field further includes an extended bit corresponding to the one or more network nodes;

    When the extended bit is the first value, the network node corresponding to the extended bit has a corresponding Condition information

    When the extended bit is the second value, the network node corresponding to the extended bit does not have corresponding condition information.
51. Apparatus according to any one of claims 45 to 50, wherein

    The duration field is also used to indicate the effective time of the whitelist field.
52. Apparatus according to any one of claims 45 to 50, wherein

    The MAC frame includes a switch indication bit;

    The switch indication bit is used to indicate whether the whitelist field is valid;

    When the switch indication bit is the first value, the whitelist field is valid;

    When the switch indicates that the bit is the second value, the whitelist field is invalid.
53. The device according to any one of claims 45 to 52, wherein the processor is further configured to:

    Listening for interference from one or more neighboring network nodes,

    Determining whether the one or more neighboring network nodes are included in the list of network nodes in the whitelist field according to the interference of the neighboring network nodes that are monitored.
54. Apparatus according to any one of claims 45 to 53, wherein

    The medium access control MAC frame is a request to send an RTS frame or to allow a CTS frame to be transmitted.
55. Apparatus according to any one of claims 45 to 54, wherein

    The device operates on a wireless fidelity Wi-Fi local area network.
56. A network node shared by a channel, the network node comprising: a processor, a memory, a receiver, and a bus, wherein the processor, the memory, and the receiver transmit data through the bus connection, where the memory Used to store data processed by the processor;

    The receiver is configured to receive a medium access control MAC frame;

    The MAC frame includes a whitelist field and a duration field;

    The whitelist field includes a network node list, and the network node list is used to indicate one or more network nodes;

    The whitelist field is configured to indicate that the one or more network nodes are allowed to not set a network allocation vector NAV according to the received duration field of the MAC frame, where the NAV is used to indicate a time when the current channel is to be occupied. ;

    The processor is configured to determine whether the network node is included in the network node list, and if it is included in the network node list, not according to a duration of the MAC frame received by the receiver The field sets the network allocation vector NAV.
57. A network node according to claim 56, wherein

    The whitelist field further includes condition information corresponding to the one or more network nodes;

    The condition information is used to indicate that the one or more network nodes do not set a NAV condition according to a duration field of the MAC frame;

    Determining whether the network node is included in the network node list, if it is included in the network node list, setting a network allocation vector NAV according to the received duration field of the MAC frame, specifically for:

    Determining whether the network node is included in the network node list, if included in the network node list and satisfying a condition indicated by the condition information, not according to the received duration of the MAC frame The field sets the network allocation vector NAV.
58. A network node according to claim 57, wherein

    The condition information is any one of the following: power information, interference strength information, distance information, and location information.
59. A network node according to claim 57 or 58, wherein

    The MAC frame frame header includes an indication bit for indicating whether the whitelist field includes the condition information;

    When the indication bit is the first value, the whitelist field includes the condition information;

    When the indication bit is the second value, the whitelist field does not include the condition information.
60. A network node according to claim 57, wherein

    The indication bit is a power management bit or a sub-frame control field of the MAC frame header The bit of the type field.
61. A network node according to claim 57 or 58, wherein

    The whitelist field further includes an extended bit corresponding to the one or more network nodes;

    When the extended bit is the first value, the network node corresponding to the extended bit has corresponding condition information;

    When the extended bit is the second value, the network node corresponding to the extended bit does not have corresponding condition information.
62. A network node according to any one of claims 56 to 61, characterized in that

    The duration field is further used to indicate a valid time of the whitelist field;

    Determining whether the network node is included in the network node list, if it is included in the network node list, setting a network allocation vector NAV according to the received duration field of the MAC frame, specifically for:

    Determining whether the network node is included in the network node list, and if it is included in the network node list and satisfying that the current time is still within the valid time, not according to the received MAC frame duration The time field sets the network allocation vector NAV.
63. A network node according to any one of claims 56 to 61, characterized in that

    The MAC frame includes a switch indication bit;

    The switch indication bit is used to indicate whether the whitelist field is valid;

    When the switch indication bit is the first value, the whitelist field is valid;

    When the switch indication bit is the second value, the whitelist field is invalid;

    Determining whether the network node is included in the network node list, if it is included in the network node list, setting a network allocation vector NAV according to the received duration field of the MAC frame, specifically for:

    Determining whether the network node is included in the network node list, if it is included in the network node list and the whitelist field is valid, not according to the received MAC frame The duration field sets the network allocation vector NAV.
64. The network node according to claim 63, wherein the processor is further configured to:

    When the switch indication bit is the first value, the network node does not set the NAV according to a duration field of all MAC frames of the network node that sends the MAC frame;

    When the switch indication bit is the second value, the network node sets the NAV according to a duration field of all MAC frames of the network node transmitting the MAC frame.
65. A network node according to any one of claims 56 to 64, wherein

    The medium access control MAC frame is a request to send an RTS frame or to allow a CTS frame to be transmitted.
66. A network node according to any one of claims 56 to 65, characterized in that

    The network node operates on a wireless fidelity Wi-Fi local area network.
67. A channel sharing system comprising the apparatus of any one of claims 23 to 33 and the apparatus of any one of claims 34 to 44.

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