CN108075867B - Air interface frame retransmission method and access point - Google Patents
Air interface frame retransmission method and access point Download PDFInfo
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- CN108075867B CN108075867B CN201611022866.8A CN201611022866A CN108075867B CN 108075867 B CN108075867 B CN 108075867B CN 201611022866 A CN201611022866 A CN 201611022866A CN 108075867 B CN108075867 B CN 108075867B
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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
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1893—Physical mapping arrangements
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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
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1861—Physical mapping arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
Abstract
Disclosed are a method and an access point for empty frame retransmission, which relate to the technical field of communication and can reduce the retransmission times caused by signal shielding. The method for retransmitting the air interface frame comprises the following steps: a first access point receives a retransmission air interface frame sent by a sender, wherein the retransmission air interface frame comprises an effective retransmission mark, and the effective retransmission mark is used for indicating that the retransmission air interface frame is sent in a retransmission process; the first access point processes the retransmission air interface frame to obtain a target air interface frame, and the retransmission mark of the target air interface frame is invalid; and the first access point sends the target air interface frame. The method and the device are suitable for the retransmission process of the air interface frame.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method for retransmitting an air interface frame and an access point.
Background
With the popularization of Wireless Local Area Network (WLAN) technology, air interface frames are transmitted between a sender and a destination receiver via a wireless medium. Although the WLAN technology can provide a more convenient wireless access condition for users, the air interface environment in the wireless network is relatively complex compared to the wired network, which may reduce the stability of the WLAN. Such as: in the process of transmitting the air interface frame, due to the existence of obstacles such as walls, pillars and the like in a transmission path, a signal being transmitted is shielded, so that the air interface frame being transmitted generates a packet loss phenomenon, namely an air interface packet loss.
In order to solve the above problem of air-interface packet loss, if the sender does not receive an Acknowledgement (ACK) message fed back by the destination receiver within a certain time, it is determined that the sending process is failed. The sender again attempts to send the air interface frame of the transmission. The retransmission process is not terminated until the sender receives the ACK message, or until the number of retransmissions reaches a retry limit.
Although the above manner can reduce the packet loss rate of the air interface, if there is a long-time signal shielding situation, it is likely that the sender does not receive the ACK message fed back by the destination receiver for a long time, so that the sender will frequently perform retransmission, but the retransmission process does not cause the destination receiver to receive the retransmitted air interface frame sent by the sender, so that a large amount of air interface resources are consumed, and the overall transmission delay of the air interface frame is high.
Disclosure of Invention
The application provides a method and an access point for air interface frame retransmission, which can reduce the total sending delay of the air interface frame.
In a first aspect, the present application provides a method for retransmitting an air interface frame. The method comprises the following steps: the first access point receives a retransmission air interface frame sent by a sender, wherein the retransmission air interface frame comprises an effective retransmission mark which is used for indicating that the retransmission air interface frame is sent in the retransmission process; and then the first access point processes the retransmission air interface frame to obtain a target air interface frame and sends the target air interface frame, wherein the retransmission mark of the target air interface frame is invalid. If there is an obstacle on the transmission path between the sender and the destination receiver, the sender cannot directly send the null frame to the destination receiver when the sender has performed data transmission with the destination receiver last time. The transmission mode is mainly characterized in that a sender and a target receiver with obstacles between can complete data interaction by means of the first access point by changing a transmission path of a retransmission empty frame. The first access point is used as a forwarding node, and the received retransmission air interface frame is forwarded after being processed, so that a target receiver can successfully receive a target air interface frame. The method and the device are equivalent to changing the occurrence place of the retransmission, so that the success probability of the retransmission process is increased. In this application, after recognizing that a retransmission flag in an air interface frame sent by a sender is valid, a first access point may determine that the air interface frame is a retransmission air interface frame that needs to be forwarded, and then, in order to avoid that other access points repeatedly perform a forwarding operation after receiving the air interface frame forwarded by the first access point, the first access point needs to process the retransmission air interface frame, obtain a target air interface frame with an invalid retransmission flag, and complete the forwarding. Therefore, the method and the device can reduce the whole transmission delay of the air interface frame under the condition that an obstacle exists between the sender and the target receiver.
In a possible design, in addition to using the value of the retransmission flag as a condition for distinguishing the retransmission air interface frame from the target air interface frame, a special flag may be set in the air interface frame, and the value of the special flag is used to distinguish whether the retransmission flag is valid, so as to achieve the effect of distinguishing the retransmission air interface frame from the target air interface frame.
In one possible design, the sender is a second access point, and after the first access point receives a retransmitted air interface frame sent by the sender, the first access point determines that the second access point is a neighbor of the first access point. If the retransmission air interface frame is sent from the second access point, the processing and forwarding operations of the retransmission air interface frame are only executed by the neighbor access point of the second access point, namely, executed by the first access point. Therefore, the number of the access points which replace the same second access point to forward the retransmission air interface frame can be reduced. Meanwhile, because the number of the first access points is not necessarily one, when a plurality of neighbor access points capable of receiving the retransmitted air interface frame exist in the second access point, the first access points meeting the neighbor condition can replace the second access point to retransmit the processed target air interface frame, so that the problem that the target receiver cannot receive the retransmitted target air interface frame due to the influence of an obstacle existing between a certain first access point and the target receiver on the retransmission process can be avoided.
In one possible design, an implementation manner of specifically determining that a second access point is a neighbor of a first access point is provided, and includes: the first access point measures the signal strength of the second access point and acquires the signal strength of the second access point measured by other access points; and if the number of the other access points with the measured signal strength of the second access point greater than the signal strength of the second access point measured by the first access point is less than the first threshold value, the first access point determines that the second access point is a neighbor of the first access point.
In a possible design, if the sender is a non-access point station and the non-access point station is associated with a third access point, after the first access point receives a retransmission air interface frame sent by the sender, the first access point measures the signal strength of the third access point and determines that the signal strength of the third access point is greater than a second threshold. If the retransmission air interface frame is sent to the associated third access point from the non-access point station, only the first access point which is smoothly communicated with the third access point is replaced by retransmission so as to avoid invalid retransmission of the air interface frame.
In one possible design, if the sender is a non-access point station and the non-access point station is associated with a third access point, after the first access point receives a retransmission air interface frame sent by the sender, the first access point determines that the third access point is a neighbor of the first access point. The first access point can measure the signal strength of the third access point and acquire the signal strength of the third access point measured by other access points; and if the number of the other access points with the measured signal strength of the third access point greater than the signal strength of the third access point measured by the first access point is less than a third threshold value, the first access point determines that the third access point is a neighbor of the first access point. If the retransmission air interface frame is sent to the associated third access point from the non-access point station, only the neighbor of the third access point is used for retransmission, so as to reduce the number of the access points for retransmitting the retransmission air interface frame.
In another aspect, the present invention provides an access point. The access point may implement the function executed by the first access point in the foregoing method embodiments, where the function may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software comprises one or more modules corresponding to the functions.
In one possible design, the access point includes a processor and a transceiver, and the processor is configured to perform the corresponding functions of the method. The transceiver is configured to support communication between the access point and other devices. The access point may also include a memory for coupling with the processor that retains program instructions and data necessary for the access point.
In yet another aspect, the present invention provides a network communication system, which includes the access point described in the above aspect, and can implement the above functions.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a network communication system according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for retransmitting an air interface frame according to an embodiment of the present invention;
fig. 3 is a flowchart of another method for retransmitting an air interface frame according to an embodiment of the present invention;
fig. 4 is a flowchart of another method for retransmitting an air interface frame according to an embodiment of the present invention;
fig. 5 is a flowchart of another method for retransmitting an air interface frame according to an embodiment of the present invention;
fig. 6 is a flowchart of another method for retransmitting an air interface frame according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a first access point according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another first access point according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention may be used in a network communication system, as shown in fig. 1, in which at least a first access point, a sender, and a destination recipient are included. The sender may specifically be the second access point or the non-access point station, and if the sender is the non-access point station, the sender associates with the destination recipient, and the destination recipient may specifically be the third access point. In the embodiment of the present invention, a sender can perform data interaction with a first access point and a target recipient respectively, but because a transmission link between the sender and the target recipient has an obstacle such as that shown in fig. 1, an air interface frame sent by the sender often cannot be successfully received by the target recipient, and therefore, the first access point is used as a forwarding node to implement a data interaction process between the sender and the target recipient, that is, an air interface frame retransmission process provided by the present application.
An embodiment of the present invention provides a method for retransmitting an air interface frame, where the method is applicable to the network communication system, and may be specifically executed by a sender, a destination recipient, and a first access point together. When a first AP retransmits an air interface frame when sending a downlink air interface frame to a terminal, a sender is specifically a first AP, the following APs are specifically second APs, and a target receiver is specifically a terminal; when the terminal retransmits the air interface frame when sending the uplink air interface frame to the first AP, the sender is specifically the terminal, the following AP is specifically the second AP, and the target receiver is specifically the first AP. As shown in fig. 2, the method flow includes:
101. the sender sends the retransmission air interface frame.
The retransmission air interface frame comprises an effective retransmission mark, and the effective retransmission mark is used for indicating that the retransmission air interface frame is sent in the retransmission process.
The retransmission air interface frame is an air interface frame that is sent again after a sender does not receive an ACK message within a certain time after sending a common air interface frame, and the content of the common air interface frame is the same as that of the retransmission air interface frame, that is, the frame payload portions of the retransmission air interface frame and the common air interface frame are the same, and the other portions of the frame header portion except the retransmission flag are the same.
102. And the first access point receives the retransmission empty frame sent by the sender.
In the format of the WLAN Frame, a Frame Control (Frame Control) field is provided in a Media Access Control (MAC) Header (english). A retransmission (Retry) flag is set in the frame control field, and occupies 1 bit (english: bit). The retransmission flag may be set to 0 or 1. Wherein, the retransmission flag of the retransmission air interface frame is set to 1, and the retransmission flag of the ordinary air interface frame is set to 0.
103. And the first access point processes the retransmission air interface frame to obtain a target air interface frame.
Wherein, the retransmission mark of the target air interface frame is invalid.
In the embodiment of the present invention, the retransmission empty frame is processed mainly by changing the valid retransmission flag to the invalid retransmission flag, and the specific processing manner may be various, for example, clearing the value already in the retransmission flag, or adding a special flag to the retransmission empty frame, and then adjusting the value in the special flag to indicate whether the retransmission flag is valid or invalid.
Not only the retransmission flag but also More Data (English: More Data) and sequence number (English: Order) fields are set in the frame control field. Wherein, when the more data field is set to 1, it indicates that there is at least one more null frame to be sent to the intended recipient. When the sequence number field is set to 1, it indicates that the current air interface frame is a long frame sub-transmission condition, and simultaneously informs the target receiver that the air interface frames need to be processed in strict order. Therefore, when the two flags are set to 0, no meaning is indicated, and therefore, in the embodiment of the present invention, the two flags may also be used as special flags when the two flags do not need to function, so that the first access point may process the retransmission air interface frame to obtain the target air interface frame without the retransmission flag being invalidated.
104. And the first access point sends a target air interface frame.
If there is an obstacle in the transmission path between the sender and the destination receiver, as shown in fig. 1, the sender cannot directly transmit the null frame to the destination receiver when the sender has last transmitted data with the destination receiver. Therefore, after the first access point receives the retransmitted air interface frame sent again by the sender, the first access point sends the air interface frame so as to try to bypass the obstacle between the sender and the receiver. If no obstacle exists between the first access point and the receiver, the target air interface frame sent by the first access point can be received by the receiver, so that the air interface frame retransmission process between the sender and the receiver is completed.
105. And after the target receiver receives the target air interface frame, the target receiver processes the target air interface frame.
If other receivers receive the target air interface frame, if the retransmission flag in the target air interface frame is identified to be invalid and the destination address carried in the target air interface frame is determined not to be the self address, the target air interface frame can be regarded as irrelevant to the self and does not need to be retransmitted, and then the other receivers can directly discard the target air interface frame. Therefore, frequent 'reflection' of the retransmitted air interface frame is avoided, that is, the next retransmission operation of the air interface frame after the retransmitted air interface frame is received by other receivers is avoided, so that the waste of additional transmission resources in the retransmission process is reduced.
If there is an obstacle on the transmission path between the sender and the destination receiver, the sender cannot directly send the null frame to the destination receiver when the sender has performed data transmission with the destination receiver last time. After the first access point receives the retransmitted air interface frame sent again by the sender, the first access point obtains a target air interface frame by processing the retransmitted air interface frame, and sends the obtained target air interface frame. The transmission mode is mainly characterized in that a sender and a target receiver with obstacles between can complete data interaction by means of the first access point by changing a transmission path of a retransmission empty frame. The first access point is used as a forwarding node, and the received retransmission air interface frame is forwarded after being processed, so that a target receiver can successfully receive a target air interface frame. In this application, after recognizing that a retransmission flag in an air interface frame sent by a sender is valid, a first access point may determine that the air interface frame is a retransmission air interface frame that needs to be forwarded, and then, in order to avoid that other access points repeatedly perform a forwarding operation after receiving the air interface frame forwarded by the first access point, the first access point needs to process the retransmission air interface frame, obtain a target air interface frame with an invalid retransmission flag, and complete the forwarding. Therefore, the present application can reduce the overall transmission delay of the air interface frame while ensuring that the sender and the target receiver with the obstacle therebetween perform communication smoothly.
In the embodiment of the present invention, when the sender is the second access point, the destination receiver may be another access point or a non-access point station; alternatively, where the sender is a non-access point station, the intended recipient may be a third access point. Wherein the non-access point station associates with the third access point.
Two specific embodiments are given below to illustrate the retransmission process where the sender is the second access point and the sender is the non-access point station, respectively.
Taking the interaction flow shown in fig. 2 as an example, if the sender is the second access point, as shown in fig. 3, after the first access point receives the retransmitted air interface frame sent by the sender, step 106 may also be performed:
106. the first access point determines that the second access point is a neighbor of the first access point.
In the embodiment of the present invention, the processing and forwarding operations for retransmitting the air interface frame are performed only by the neighbor access point of the second access point as the sender, that is, by the first access point. Therefore, the number of the first access points is not necessarily one, and therefore, when a plurality of neighbor access points capable of receiving the retransmitted air interface frame exist in the second access point, the first access points meeting the neighbor conditions can replace the second access point to retransmit the processed target air interface frame, and therefore the situation that the target receiver cannot receive the retransmitted target air interface frame due to the fact that an obstacle exists between one first access point and the target receiver and the retransmission process is influenced can be avoided.
It should be noted that, the process of the first access point determining that the third access point is a neighbor of the first access point is similar to step 106, and both implementation processes may be regarded as a process of one access point determining that the other access point is a neighbor of the one access point. There are various ways to determine the neighbor access point of the second access point, for example, it may be determined whether the access point is a neighbor of the second access point by determining whether a straight-line distance between the access point receiving the retransmitted air interface frame and the second access point is smaller than a distance threshold, or whether the distance between the access point and the second access point is relatively close. The method for determining the linear distance may also be in various manners, for example, by determining the total time length of the transmission of the air interface frame between the two, or by actual measurement, or by other parameters such as path loss, to determine whether the current access point is a neighbor of the second access point. Similarly, the method for determining the neighbor access point of the third access point can also be implemented by adopting the method.
As shown in fig. 4, the step 106 may be implemented as steps 201 to 203:
201. the first access point measures the signal strength of the second access point.
The measured signal strength of the second access point of the first access point is: the second access point transmits a signal to the first access point, the signal strength of the first access point when receiving the signal. The first access point may further obtain the signal strength of the first access point measured by the second access point, that is, the first access point sends a signal to the second access point, and the signal strength of the second access point when receiving the signal is not limited herein.
202. The first access point obtains the signal strength of the second access point measured by other access points.
203. And if the number of the other access points with the measured signal strength of the second access point greater than the signal strength of the second access point measured by the first access point is less than the first threshold value, the first access point determines that the second access point is a neighbor of the first access point.
The steps 201 and 202 may be executed simultaneously or in a certain sequence. After the first access point determines its own signal strength and the signal strengths of the second access points measured by the other access points, it may be determined that the second access point is a neighbor of itself when the number of the other access points whose measured signal strengths of the second access points are greater than the signal strength of the second access point measured by the first access point is less than the first threshold. Wherein the first threshold may be a positive integer greater than or equal to 1. When the value of the first threshold is 1, if the above condition is satisfied, it indicates that there is no other access point whose measured signal strength of the second access point is greater than that of the second access point measured by the first access point, and the first access point may be regarded as the closest access point to the second access point or the access point with the best communication condition, so that the second access point is used as a neighbor of the first access point, and the first access point may participate in the retransmission process; when the value of the first threshold is a positive integer greater than 1, if the above condition is satisfied, it indicates that there is at least one other access point whose measured signal strength of the second access point is greater than that of the second access point measured by the first access point, but in order to ensure that the retransmitted air interface frame is successfully sent to the intended recipient, in the embodiment of the present invention, the first access point may also serve as a forwarding node, and complete processing and forwarding of the retransmitted air interface frame together with the other access points that satisfy the condition.
Or, a table for indicating whether the access point and each of the other access points belong to neighbors may be prestored in each access point, and after the access point receives the retransmission air interface frame, whether the access point and the sender belong to a neighbor relationship may be directly determined from the table, so as to determine whether the access point needs to process and forward the retransmission air interface frame. In the embodiment of the present invention, an implementation manner of determining whether the second access point is a neighbor of the first access point is not limited, and the implementation manner is only one possible implementation manner.
If the second access point does not belong to the neighbor of the first access point, the first access point may directly discard the received retransmission air interface frame without processing the retransmission air interface frame.
Taking the interaction flow shown in fig. 2 as an example, if the sender is a non-access point station, as shown in fig. 5, after the first access point receives the retransmitted air interface frame sent by the sender, step 204 and step 205 may also be performed:
204. the first access point measures a signal strength of the third access point.
Similar to step 106, the measured signal strength of the third access point by the first access point may be: the third access point transmits a signal to the first access point, the signal strength of the first access point when receiving the signal. The first access point may further obtain the signal strength of the first access point measured by the third access point, that is, the first access point sends a signal to the third access point, and the signal strength of the third access point when receiving the signal is not limited herein.
205. The first access point determines that the signal strength of the third access point is greater than a second threshold.
In the embodiment of the present invention, the second threshold may be set by a worker according to a historical experience value. Wherein the second threshold value has the following functions: and as a reference value, selecting the access points which need to perform retransmission air interface frame processing and forwarding operation from a plurality of access points.
And if the first access point determines that the signal strength of the third access point is less than or equal to the second threshold, the first access point discards a retransmission air interface frame sent by the sender, and the retransmission air interface frame is processed and forwarded by other access points which can meet the conditions.
In addition to the implementation shown in fig. 5, the implementation may also be implemented as the implementation shown in fig. 6, that is, after the first access point receives the retransmitted air interface frame sent by the sender, step 206 to step 208 may also be performed:
206. the first access point measures a signal strength of the third access point.
207. The signal strength of the third access point measured by the other access points is obtained.
208. And if the number of the other access points with the measured signal strength of the third access point greater than the signal strength of the third access point measured by the first access point is less than a third threshold value, the first access point determines that the third access point is a neighbor of the first access point.
Step 206 and step 207, similar to step 201 and step 202, may be executed simultaneously or in a certain order.
In addition, it is considered that during the actual retransmission process, the destination receiver may receive multiple identical air interface frames retransmitted from different first access points, which means that the destination receiver receives multiple redundant messages. After the destination receiver receives the air interface frame, the redundant message may be processed according to the sequence number in the 802.11 frame. The frame headers of the air interface frames comprise serial numbers, and the serial numbers of the frame headers of the air interface frames carrying the same content are the same. Therefore, if the destination receiver has received the air interface frame carrying the sequence number, the destination receiver may consider the currently received air interface frame as a duplicate frame. The intended recipient may discard the repeated air-interface frames.
Therefore, compared with the retransmission mode in the prior art, the retransmission method and the retransmission device provided by the embodiment of the invention equivalently change the occurrence place of retransmission, thereby increasing the success probability of the retransmission process, reducing the packet loss rate, avoiding the occurrence of repeated retransmission process and improving the air interface transmission efficiency. If a certain access point finds that the access point does not need to participate in the retransmission process after receiving the retransmission air interface frame, the access point can directly discard the air interface frame, thereby avoiding extra resource waste.
The above description mainly introduces the scheme provided by the embodiment of the present invention from the perspective of interaction between various devices. It is to be understood that each device, for example, the first access point, etc., for implementing the above-described functions, includes corresponding hardware structures and/or software modules for performing the respective functions. Those of ordinary skill in the art will readily appreciate that the present invention can be implemented in hardware or a combination of hardware and computer software for performing the exemplary elements and algorithm steps described in connection with the embodiments disclosed herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiment of the present invention, each of the functions may correspond to an independent functional module, or at least two of the functional modules may be integrated into a specific functional module, and fig. 7 only shows a possible structural schematic diagram. The first access point 30 includes: a receiving module 31, a processing module 32, a sending module 33, a determining module 34, a measuring module 35 and an obtaining module 36. Wherein, the receiving module 31 may be configured to execute step 102 in fig. 2, fig. 3, fig. 5, and fig. 6; the processing module 32 may be configured to perform step 103 in fig. 2, 3, 5, 6; the sending module 33 may be configured to execute step 104 in fig. 2, fig. 3, fig. 5, and fig. 6; determination module 34 may be configured to perform step 106 in fig. 3, step 203 in fig. 4, step 205 in fig. 5, step 208 in fig. 6; measurement module 35 may be configured to perform step 201 in fig. 4, step 204 in fig. 5, step 206 in fig. 6; the obtaining module 36 may be configured to perform step 202 in fig. 4 and step 207 in fig. 6. The first access point 30 may also include a storage module 37 for storing program codes and data. All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.
The first access point according to the embodiment of the present invention may be the first access point 40 shown in fig. 8. Referring to fig. 8, the first access point 40 includes: a processor 41, a transceiver 42. In an embodiment of the present invention, a memory 43 and a bus 44 may also be included. The processor 41 and the memory 43 are connected to each other via a bus 44. The bus may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 8, but this is not intended to represent only one bus or type of bus.
The processor 41 is a Central Processing Unit (CPU), an Application-Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or any combination thereof. The transceiver 42 is an antenna.
Processor 41 may be used, among other things, to implement one or more steps of the methods shown in fig. 2-6.
The steps of a method or algorithm described in connection with the disclosure herein may be embodied in hardware or in software instructions executed by a processor. The software instructions may be comprised of corresponding software modules that may be stored in Random Access Memory (RAM), flash memory, read-only memory (ROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), a hard disk, a removable hard disk, a compact disc read-only memory (CD-ROM), or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor.
It will be appreciated by one of ordinary skill in the art that in one or more of the examples described above, the functions described herein may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on a computer-readable medium. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modification, replacement, improvement, etc. made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.
Claims (9)
1. A method for air interface frame retransmission is characterized in that the method comprises the following steps:
a first access point receives a retransmission air interface frame sent by a sender, wherein the retransmission air interface frame comprises an effective retransmission mark, and the effective retransmission mark is used for indicating that the retransmission air interface frame is sent in a retransmission process;
the sender is a second access point, and the first access point determines that the second access point is a neighbor of the first access point; or, the sender is a non-access point station, the non-access point station is associated with a third access point, and the first access point determines that the third access point is a neighbor of the first access point;
the first access point processes the retransmission air interface frame to obtain a target air interface frame, wherein a retransmission mark of the target air interface frame is invalid, and the retransmission mark is invalid and used for indicating that the target air interface frame does not need to be forwarded by other access points;
and the first access point sends the target air interface frame.
2. The method of claim 1, further comprising:
the first access point measures the signal strength of the second access point and acquires the signal strength of the second access point measured by other access points;
and if the measured signal strength of the second access point is greater than the signal strength of the second access point measured by the first access point, the number of other access points is less than a first threshold value, the first access point determines that the second access point is a neighbor of the first access point.
3. The method according to claim 1, wherein after the first access point receives the retransmitted air interface frame sent by the sender, the method further comprises:
the first access point measuring a signal strength of the third access point;
the first access point determines that a signal strength of the third access point is greater than a second threshold.
4. An access point, wherein the access point is a first access point, the access point comprising:
a receiving module, configured to receive a retransmission air interface frame sent by a sender, where the retransmission air interface frame includes an effective retransmission flag, and the effective retransmission flag is used to indicate that the retransmission air interface frame is sent in a retransmission process;
the sender is a second access point, and the determining module is used for determining that the second access point is a neighbor of the first access point; or, the sender is a non-access point station, the non-access point station is associated with a third access point, and the determining module is configured to determine that the third access point is a neighbor of the first access point;
a processing module, configured to process the retransmitted air interface frame received by the receiving module to obtain a target air interface frame, where a retransmission flag of the target air interface frame is invalid, and the retransmission flag is invalid and used to indicate that the target air interface frame does not need to be forwarded by other access points;
and the sending module is used for sending the target air interface frame obtained by the processing module.
5. The access point of claim 4, further comprising:
the measuring module is used for measuring the signal strength of the second access point and acquiring the signal strength of the second access point measured by other access points through the acquiring module;
the determining module is further configured to determine that the second access point is a neighbor of the first access point if the number of other access points whose signal strengths of the second access point measured by the measuring module are greater than the signal strength of the second access point measured by the measuring module is smaller than a first threshold.
6. The access point of claim 4, wherein the measurement module is further configured to measure a signal strength of the third access point;
a determining module, further configured to determine that the signal strength of the third access point measured by the measuring module is greater than a second threshold.
7. An access point, wherein the access point is a first access point, the access point comprising a transceiver and a processor, wherein,
the processor is configured to:
receiving, by the transceiver, a retransmission air interface frame sent by a sender, where the retransmission air interface frame includes an effective retransmission flag, and the effective retransmission flag is used to indicate that the retransmission air interface frame is sent in a retransmission process;
the sender is a second access point, and the second access point is determined to be a neighbor of the first access point; or, the sender is a non-access point station, the non-access point station is associated with a third access point, and the third access point is determined to be a neighbor of the first access point;
processing the retransmission air interface frame to obtain a target air interface frame, wherein the retransmission mark of the target air interface frame is invalid, and the invalid retransmission mark is used for indicating that the target air interface frame does not need to be forwarded by other access points;
and sending the target air interface frame by the transceiver.
8. The access point of claim 7, wherein the processor is further configured to measure the signal strength of the second access point and obtain the signal strength of the second access point measured by other access points;
the processor is further configured to determine that the second access point is a neighbor of the first access point if the measured number of other access points whose signal strengths of the second access point are greater than the signal strength of the second access point measured by the first access point is less than a first threshold.
9. The access point of claim 7, wherein after the first access point receives the retransmitted air interface frame sent by the sender, the processor is further configured to measure a signal strength of the third access point;
the processor is further configured to determine that a signal strength of the third access point is greater than a second threshold.
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| CN101741732B (en) * | 2009-11-30 | 2011-11-30 | 中国人民解放军国防科学技术大学 | Extension managing method for network node memory in capacity delay network |
| KR101741003B1 (en) * | 2011-01-28 | 2017-05-30 | 삼성전자주식회사 | Method for communication using duplicated ack |
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