CN108809478B - Frame sending method and related equipment - Google Patents
Frame sending method and related equipment Download PDFInfo
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- CN108809478B CN108809478B CN201710295097.7A CN201710295097A CN108809478B CN 108809478 B CN108809478 B CN 108809478B CN 201710295097 A CN201710295097 A CN 201710295097A CN 108809478 B CN108809478 B CN 108809478B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0019—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach
- H04L1/0021—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach in which the algorithm uses adaptive thresholds
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
- H04W74/0816—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision avoidance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
Abstract
A frame transmission method and related device are disclosed for improving the transmission quality of group address frames. The method comprises the following steps: and the AP determines an STA set according to the receiver address of the group address frame to be sent. If a target STA having a hidden node relationship with the AP exists in the STA set and the AP is to send an individual address frame of the target STA, the AP modifies and sends the individual address frame, wherein the length of the individual address frame is less than a fragmentation threshold, a receiver address of the individual address frame is an address of the target STA, a time length value in a time length field of the modified individual address frame is the sum of the time length for sending the group address frame, the time length for sending an Acknowledgement (ACK) frame and 2 SIFS, and values of more fragment bits of the modified individual address frame are 1. The AP sends the group address frame after the AP receives the ACK frame from the target STA.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a frame sending method and a related device.
Background
If there is a hidden node in a Wireless Local Area Network (WLAN), the transmission quality of the group address frame may be affected.
Disclosure of Invention
The application provides a frame sending method and related equipment, which are used for improving the transmission quality of a group address frame.
A first aspect provides a frame transmission method, including a wireless Access Point (AP) and at least one Station (STA) in a wireless local area network, where the AP may be associated with the at least one TA. The AP firstly acquires a group address frame to be sent, determines an STA set according to a receiver address contained in the group address frame, and further judges whether an independent address frame to be sent to a target STA exists or not if the AP determines that the target STA with a hidden node relation with the AP exists in the STA set. If there is a separate address frame to be sent to the target STA, the AP modifies and sends the separate address frame. The length of the individual address frame is less than the fragmentation threshold. The recipient address of the individual address frame is the address of the target STA. The modified duration value in the duration field of the individual address frame is the sum of the duration of sending the group address frame, the duration of sending an Acknowledgement (ACK) frame, and 2 Short Inter Frame Spaces (SIFS). And the value of the more fragment bit of the modified individual address frame is 1. After the AP receives the ACK frame from the target STA, the AP sends a group address frame, and the time length value in the time length field of the ACK frame is the sum of the time length for sending the group address frame and 1 SIFS. In the method, the value of the more fragment bit is 1, so that the time length field of the ACK frame is triggered not to be 0 to complete the reservation of the channel, namely, the data frame sending operation of other APs to the target STA is ensured to be closed in the process of receiving the group address frame sent by the AP by the target STA, the group address frame sent by the AP can be correctly received by the target STA, the conflict generated when the group address frame is received by the target STA is prevented, and the transmission quality of the group address frame is improved.
The AP may determine that the target STA has a hidden node relationship with the AP as follows:
in one possible implementation, if the retransmission rate of the target STA is greater than a preset threshold, the AP determines that the target STA and the AP have a hidden node relationship.
A second aspect provides an AP configured to implement the functionality of the method provided by the first aspect or any one of the implementations of the first aspect. The functions may be implemented by hardware, or by hardware executing corresponding software, where the hardware or software includes one or more modules corresponding to the above functions.
A third aspect provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the first aspect or any one of the implementations of the first aspect.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a schematic view of a hidden node scenario in a wireless local area network according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an RTS/CTS mechanism according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an embodiment of a frame transmission method in the embodiment of the present invention;
fig. 4 is a schematic structural diagram of a frame transmitting device in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an AP in the embodiment of the present invention.
Detailed Description
The application provides a frame sending method and related equipment, which are used for improving the transmission quality of a group address frame.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein.
As shown in fig. 1, fig. 1 is a schematic view of a hidden node scene under a wireless local area network according to the present application. In fig. 1, the wireless lan includes AP1, AP2, STA1, and STA 2. Wherein STA1 is within wireless signal coverage of AP1 and AP 2. STA2 is within wireless signal coverage of AP2, and AP1 and AP2 use the same channel. The AP1 is not within wireless signal coverage of the AP 2. The AP2 is not within wireless signal coverage of the AP 1. Therefore, the AP1 and the AP2 cannot receive the wireless signal of each other. The reason why the AP1 and the AP2 cannot receive the wireless signal of the other party may be a long distance, an obstacle between the AP1 and the AP2, or both. AP2 is a hidden node of AP1, since wireless signals transmitted by AP1 may be received by STA1, but not by AP2 in communication with STA 1. Similarly, AP1 is a hidden node of AP 2. If AP1 and AP2 simultaneously transmit wireless signals to STA1, the wireless signals from AP1 and AP2 may collide (collision) at STA1, so that STA1 cannot correctly receive the wireless signals from either side.
In wlan, the collision problem caused by hidden nodes is rather difficult to listen because the wireless transceiver is usually in half-duplex operation mode, i.e. cannot transmit and receive data at the same time. For individual address frame traffic, the WLAN may use a Request To Send/Clear To Send (RTS/CTS) mechanism To improve transmission efficiency. Fig. 2 is a schematic diagram illustrating a RTS/CTS mechanism according to the present application. For example, AP1 is the sender in fig. 2, STA1 is the receiver in fig. 2, and AP2 is the other station in fig. 2. The AP1 sends an RTS frame to cause STAs 1 in the common coverage area between both AP1 and AP2 to reply to a CTS frame. Thereby avoiding AP1 and AP2 from simultaneously sending wireless signals to STA 1. For group address frame traffic, the following mechanism can be used to improve transmission efficiency
The frame transmission method in the embodiment of the present invention is described below with reference to specific embodiments. Referring to fig. 3, an embodiment of a frame transmission method according to the embodiment of the present invention includes:
101. and the AP determines an STA set according to the receiver address of the group address frame to be sent.
The AP stores the correspondence between the multicast group and the STA. For example, the AP records STAs in each multicast group using an Internet Group Management Protocol (IGMP) snooping mechanism. And the AP acquires the STA set corresponding to the receiver address of the group address frame to be sent according to the corresponding relation stored in the AP.
102. If a target STA having a hidden node relationship with the AP exists in the STA set and the AP has a single address frame to be sent to the target STA, the AP modifies and sends the single address frame.
If the receiver address of the individual address frame is the address of the target STA, the individual address frame is an individual address frame to be transmitted to the target STA. Although the length of the individual address frame is less than the fragmentation threshold, the AP does not fragment the individual address frame, and the AP still sets the value of its more fragment bits to 1. The AP further modifies the duration value in the duration field of the individual address frame to cause the duration value in the duration field of the ACK frame replied by the target STA to exceed the duration required by the AP to send the group address frame. And the time length value in the time length field of the modified single address frame is the sum of the time length for sending the group address frame, the time length for sending the ACK frame and 2 SIFS.
In order to ensure that the target STA can normally receive the group address frame transmitted by the AP, the duration value in the duration field of the modified individual address frame needs to be the sum of the time required for completing the transmission of the ACK frame and the time required for completing the transmission of the group address frame. The time required for completing the sending of the ACK frame is 1 SIFS and the time length for sending the ACK frame, and the SIFS is the interval between the single address frame and the ACK frame. The time required to complete the group address frame transmission is 1 SIFS and the duration of transmitting the group address frame, and the SIFS is the interval between the ACK frame and the group address frame.
In order to ensure that each STA in the STA set can receive the group address frame sent by the AP, the AP first determines whether a target STA having a hidden node relationship with the AP exists in the STA set. Because if the target STA has a hidden node relationship with the AP, the target STA may not be able to receive the group address frame sent by the AP.
The target STA having a hidden node relationship with the AP means that the target STA is within a common coverage area of the AP and the other AP, and the AP and the other AP are hidden nodes with each other. .
Optionally, the AP may determine that the target STA and the AP have a hidden node relationship in the following manner:
the AP periodically transmits sounding frames to each STA in the STA set, respectively.
And if the retransmission rate of the target STA is greater than the preset threshold value, the AP determines that the target STA and the AP have a hidden node relationship.
For example, the preset threshold may take on a value of 30%.
If the AP determines that there are local individual address frames to be sent to the target STA, the AP may modify and send the individual address frames. Since the target STA and the AP have a hidden node relationship, in order to ensure that the target STA can normally receive the group address frame sent by the AP, the AP may set the value of more fragment bits in the individual address frame to 1, and ensure that the duration value in the duration field of the modified individual address frame is the sum of the duration for sending the group address frame, the duration for sending the ACK frame, and 2 SIFS. And after the target STA receives the single address frame, the time length field of the ACK frame triggering the reply of the target STA is not 0 due to the fact that the value of the more fragment bit is set to be 1, so that the reservation of a channel is completed, and the target STA can normally receive the group address frame sent by the AP.
103. After the AP receives the ACK frame from the target STA, the AP sends a group address frame, and the time length value in the time length field of the ACK frame is the sum of the time length for sending the group address frame and 1 SIFS.
And after the target STA receives the single address frame, the target STA sends an ACK frame. The duration value of the duration field of the ACK frame is equal to the value of the duration field of the individual address frame minus the duration of the ACK frame sent and 1 SIFS. If the AP receives the ACK frame, the AP sends a group address frame.
Since the duration field in the ACK frame is not 0, other APs enter a Network Allocation Vector (NAV) state after receiving the ACK frame, and the duration of the NAV state is equal to the value of the duration field in the ACK frame. The AP in NAV state does not transmit frames, so other APs that are hidden nodes with the AP do not transmit frames during this period, and the target STA can receive the group address frame transmitted by the AP.
In addition, since the other STA stations in the STA set do not have a hidden node relationship with the AP, the other STA stations in the STA set can also correctly receive the group address frame in the process that the AP sends the group address frame to the target STA.
If the AP does not have the single address frame to be sent to the target STA, the AP sends an RTS frame. And then, if the AP receives a CTS frame from the target STA, the AP sends a group address frame, and the time length value in the time length field of the CTS frame is the sum of the time length for sending the group address frame and 1 SIFS.
The value of the more fragment bit is 1, so that the time length field of the ACK frame is triggered not to be 0 to complete channel reservation, that is, other APs close the data frame sending operation of the target STA in the process of receiving the group address frame sent by the AP, so that the target STA can correctly receive the group address frame sent by the AP, the target STA is prevented from colliding when receiving the group address frame, and the transmission quality of the group address frame is improved.
Referring to fig. 4, a schematic structural diagram of a frame sending device 200 according to an embodiment of the present invention includes that the frame sending device 200 includes a determining module 201, a processing module 202, a receiving module 203, and a sending module 204.
A determining module 201, configured to determine an STA set according to a receiver address of a group address frame to be sent.
A processing module 202, configured to modify and send an individual address frame if an individual address frame exists in the STA set and is to be sent to a target STA, where the length of the individual address frame is smaller than a fragmentation threshold, a receiver address of the individual address frame is an address of the target STA, a duration value in a duration field of the modified individual address frame is a sum of a duration for sending the group address frame, a duration for sending the ACK frame, and 2 SIFS, and values of more fragment bits of the modified individual address frame are 1.
A receiving module 203, configured to receive an ACK frame from the target STA.
A sending module 204, configured to send the group address frame after the receiving module 203 receives the ACK frame, where a duration value in a duration field of the ACK frame is a sum of a duration for sending the group address frame and 1 SIFS.
For details of the working process of the frame sending device 200, reference may be made to the corresponding process in the foregoing embodiment in fig. 3, which is not described herein again.
Referring to fig. 5, an AP according to an embodiment of the present invention is described below. The AP300 comprises a processor 301 and a transceiver 302, the processor 301 being connected to the transceiver 302. The processor 301 may be a Central Processing Unit (CPU), a network processor, etc., and the processor may include a WLAN chip and a CPU chip, the WLAN chip is responsible for baseband processing of wireless signals, and the transceiver 302 may be an antenna.
The processor 301 is configured to determine a set of STAs according to a receiver address of a group address frame to be transmitted. If a target STA which has a hidden node relation with the AP exists in the STA set and an individual address frame to be sent to the target STA exists, the individual address frame is modified and sent, wherein the length of the individual address frame is smaller than a fragmentation threshold, the receiver address of the individual address frame is the address of the target STA, the time length value in the time length field of the modified individual address frame is the sum of the time length for sending the group address frame, the time length for sending the ACK frame and 2 SIFS, and the value of more fragment bits of the modified individual address frame is 1.
The transceiver 302 is configured to transmit a group address frame after receiving an ACK frame from a target STA, where a duration value in a duration field of the ACK frame is a sum of a duration for transmitting the group address frame and 1 SIFS.
For the specific working processes of the processor 301 and the transceiver 302, reference may be made to the corresponding processes in the foregoing embodiment of fig. 3, which are not described herein again.
In the above embodiments, it may be entirely or partially implemented by software, hardware, or a combination thereof. When implemented in software or a combination of software and hardware, may be implemented in whole or in part in the form of a computer program product.
The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a storage medium or transmitted from one storage medium to another. For example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center by wire (e.g., coaxial cable, twisted pair, fiber optics) or wirelessly (e.g., infrared, wireless, microwave, etc.). The storage medium may be any medium that a computer can store or a data storage device including one or more media integrated servers, data centers, and the like. The media may be magnetic media (e.g., floppy disks, hard disks, magnetic tape), optical media (e.g., compact disks), or semiconductor media (e.g., Solid State Disks (SSDs)), among others.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or may be integrated into another system.
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 also be distributed on a plurality of network devices. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same. Modifications to the embodiments described above may be made by a person skilled in the art without departing from the scope of the claims.
Claims (6)
1. A frame transmission method, comprising:
the access point AP determines a station STA set according to the receiver address of a group address frame to be sent;
if a target STA having a hidden node relationship with the AP exists in the STA set and the AP is to send an individual address frame of the target STA, the AP modifies and sends the individual address frame, wherein the length of the individual address frame is less than a fragmentation threshold, a receiver address of the individual address frame is an address of the target STA, a time length value in a time length field of the modified individual address frame is the sum of the time length for sending the group address frame, the time length for sending an Acknowledgement (ACK) frame and 2 SIFS (interframe space) intervals, and the value of more fragment bits of the modified individual address frame is 1;
and after the AP receives an ACK frame from the target STA, the AP sends the group address frame, and the time length value in the time length field of the ACK frame is the sum of the time length for sending the group address frame and 1 SIFS.
2. The method of claim 1, further comprising:
and if the retransmission rate of the target STA is greater than a preset threshold value, the AP determines that the target STA and the AP have a hidden node relationship.
3. A frame transmission device, characterized by comprising:
the determining module is used for determining a station STA set according to the receiver address of the group address frame to be sent;
a processing module, configured to modify and send an individual address frame if a target STA having a hidden node relationship with an AP exists in the STA set and the individual address frame is to be sent to the target STA, where a length of the individual address frame is smaller than a fragmentation threshold, a receiver address of the individual address frame is an address of the target STA, a duration value in a duration field of the modified individual address frame is a sum of a duration for sending the group address frame, a duration for sending an acknowledgement ACK frame, and 2 SIFS intervals, and a value of more fragment bits of the modified individual address frame is 1;
a receiving module, configured to receive an ACK frame from the target STA;
and the sending module is used for sending the group address frame after the receiving module receives the ACK frame, and the time length value in the time length field of the ACK frame is the sum of the time length for sending the group address frame and 1 SIFS.
4. The frame transmitting device according to claim 3, wherein the determining module is further configured to determine that the target STA has a hidden node relationship with the AP if the retransmission rate of the target STA is greater than a preset threshold.
5. A wireless access point, AP, comprising: a processor and a transceiver;
the processor is used for determining a station STA set according to the receiver address of the group address frame to be sent; if a target STA which has a hidden node relationship with the AP exists in the STA set and an individual address frame to be sent to the target STA exists, modifying and sending the individual address frame, wherein the length of the individual address frame is smaller than a fragmentation threshold, the receiver address of the individual address frame is the address of the target STA, the time length value in the time length field of the modified individual address frame is the sum of the time length for sending the group address frame, the time length for sending an Acknowledgement (ACK) frame and 2 short interframe space (SIFS), and the value of more fragment bits of the modified individual address frame is 1;
the processor is further configured to send the group address frame by using the transceiver after receiving an ACK frame from the target STA by using the transceiver, where a duration value in a duration field of the ACK frame is a sum of the duration for sending the group address frame and 1 SIFS.
6. The AP of claim 5, wherein the processor is further configured to determine that the target STA has a hidden node relationship with the AP if the retransmission rate of the target STA is greater than a preset threshold.
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