CN113242575B - Data unit transmission method, device and system for wireless station and access point - Google Patents
Data unit transmission method, device and system for wireless station and access point Download PDFInfo
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- CN113242575B CN113242575B CN202110373069.9A CN202110373069A CN113242575B CN 113242575 B CN113242575 B CN 113242575B CN 202110373069 A CN202110373069 A CN 202110373069A CN 113242575 B CN113242575 B CN 113242575B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
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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
- H04L1/1607—Details of the supervisory signal
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
- H04W28/12—Flow control between communication endpoints using signalling between network elements
Abstract
The invention discloses a data unit transmission method of a wireless station, which comprises the following steps: determining an auxiliary wireless access point corresponding to the wireless station, and sending an aggregated data unit and a block acknowledgement request frame to the wireless access point in the basic service system; when a first block acknowledgement frame returned by a main wireless access point is received and it is judged that the main wireless access point does not receive all data units in the aggregated data units, the first block acknowledgement frame is forwarded to the auxiliary wireless access point, so that the auxiliary wireless access point deletes the data units received by the auxiliary wireless access point and the main wireless access point according to the first block acknowledgement frame, and sends the existing data units to a next transmission node. The invention also discloses a data unit transmission method of the wireless access point, and a corresponding device and a corresponding system. The invention can improve the utilization rate of the non-associated wireless access point in the back-off time, reduce the retransmission of the protocol data unit and effectively increase the network throughput.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a system for transmitting a data unit of a wireless station and an access point.
Background
In the field of Wireless Local Area Network (WLAN), a Basic Service Set (BSS) is a component of an 802.11 standard architecture, where the BSS generally includes an Access Point (AP) and a Wireless Station (STA), the AP is responsible for resource allocation and data transmission of the Network, and all STAs communicate with the AP in their TDMA transmission timeslots.
In the prior art, in order to prevent communication failure when an STA roams and switches an AP in a network, by setting a redundant AP, the STA tries to communicate with the redundant AP after failing to communicate with a primary AP, and the redundant AP forwards received information to the primary AP. However, the inventors found that the prior art has at least the following problems: when the STA sends a signal to the main AP, the redundant AP can retreat from the signal of the STA to wait, a radio frequency state machine of the redundant AP still keeps receiving a state monitoring channel during the waiting period, and only after the STA fails to communicate with the main AP, the redundant AP can receive and analyze the signal of the STA, so that the utilization rate of the redundant AP in the retreat time is low, and the throughput of the network is low.
Disclosure of Invention
Embodiments of the present invention provide a method, an apparatus, and a system for transmitting a data unit of a wireless station and an access point, which can improve the utilization rate of a non-associated wireless access point within a backoff time, reduce retransmission of a protocol data unit, and effectively increase network throughput.
To achieve the above object, an embodiment of the present invention provides a method for transmitting a data unit in a wireless station, including:
determining an auxiliary wireless access point corresponding to the wireless station; the auxiliary wireless access point is positioned in a basic service system where the wireless station is positioned;
sending aggregate data units and block acknowledgement request frames to a wireless access point in the basic service system; the aggregation data unit consists of a plurality of data units;
when a first block acknowledgement frame returned by a main wireless access point is received, judging whether the main wireless access point receives all data units in the aggregated data units or not according to the first block acknowledgement frame; wherein the first block acknowledgement frame is filled by the master wireless access point according to a data unit received by the master wireless access point;
and when the main wireless access point does not receive all the data units in the aggregated data unit, forwarding the first block acknowledgement frame to the auxiliary wireless access point, so that the auxiliary wireless access point deletes the data units received by the auxiliary wireless access point and the main wireless access point according to the first block acknowledgement frame, and sends the existing data units to the next transmission node.
As an improvement of the above scheme, the determining the secondary wireless access point corresponding to the wireless station specifically includes:
detecting whether a wireless access point meeting a preset condition exists in the basic service system; wherein the preset conditions are as follows: the wireless signal strength is greater than a preset threshold value and is not the main wireless access point;
and determining an auxiliary wireless access point corresponding to the wireless station according to the wireless access point meeting the preset condition.
As an improvement of the above solution, after the determining the secondary wireless access point corresponding to the wireless station, the method further includes:
identify information of the secondary wireless access point in the aggregated data unit; and the identity information of the auxiliary wireless access point is used for triggering the wireless access point in the basic service system to confirm whether the wireless access point is the auxiliary wireless access point of the wireless station or not after receiving the aggregated data unit.
As an improvement of the above solution, when the number of the secondary wireless access points is two or more, after determining the secondary wireless access point corresponding to the wireless station, the method further includes:
and marking the serial number of each auxiliary wireless access point in the aggregation data unit.
As an improvement of the above solution, when the primary wireless access point does not receive all the data units in the aggregated data unit, the forwarding the first block acknowledgement frame to the secondary wireless access point, so that the secondary wireless access point deletes the data units received by itself and received by the primary wireless access point according to the first block acknowledgement frame, and sends the existing data units to the primary wireless access point, specifically includes:
when the main wireless access point does not receive all the data units in the aggregated data units, taking a first auxiliary wireless access point as a current auxiliary wireless access point according to the sequence number of the auxiliary wireless access point;
forwarding the first block acknowledgement frame as a current block acknowledgement frame to the current auxiliary wireless access point, so that the current auxiliary wireless access point deletes the data unit which is received by the current auxiliary wireless access point and successfully received according to the current block acknowledgement frame, sends the existing data unit to a next transmission node, and returns a second block acknowledgement frame; wherein the second block acknowledgement frame is populated by the secondary wireless access point based on its existing data units;
merging the second block acknowledgment frame and the current block acknowledgment frame to update the current block acknowledgment frame;
judging whether all data units in the aggregated data unit have been successfully received or not according to the current block acknowledgement frame;
and when the aggregated data unit has data units which are not successfully received and the current auxiliary wireless access point is not the last auxiliary wireless access point, taking the next auxiliary wireless access point as the current auxiliary wireless access point until all the auxiliary wireless access points finish traversing, or judging that all the data units in the aggregated data unit are successfully received.
As an improvement of the above, the method further comprises:
after all the auxiliary wireless access points finish traversing, taking the current block confirmation frame as a target block confirmation frame, and judging whether all the data units in the aggregated data unit are successfully received or not according to the target block confirmation frame;
and when the data units in the aggregated data unit are unsuccessfully received, retransmitting the data units which are not received according to the target block acknowledgement frame.
The embodiment of the invention also provides a data unit transmission method of the wireless access point, which comprises the following steps:
receiving aggregate data units and block acknowledgement request frames of all wireless stations in a basic service system;
confirming whether the wireless access point is a main wireless access point of a wireless station to which the received aggregate data unit and block confirmation request frame belong;
if so, storing the successfully received data unit, filling a first block of acknowledgement frame according to the data unit received by the wireless station, and returning the first block of acknowledgement frame to the wireless station;
if not, judging whether the aggregation data unit is an auxiliary wireless access point of the wireless station or not according to the aggregation data unit, and storing the successfully received data unit when the aggregation data unit is judged to be the auxiliary wireless access point of the wireless station; and after receiving the current block acknowledgement frame forwarded by the wireless station, deleting the data unit which is received by the wireless station and is successfully received, and sending the existing data unit to the next transmission node.
An embodiment of the present invention further provides a data unit transmission apparatus for a wireless station, including:
an auxiliary wireless access point determining module, configured to determine an auxiliary wireless access point corresponding to the wireless station; the auxiliary wireless access point is positioned in a basic service system where the wireless station is positioned;
a data unit sending module, configured to send an aggregated data unit and a block acknowledgement request frame to a wireless access point in the basic service system; the aggregation data unit consists of a plurality of data units;
the block acknowledgement frame judging module is used for judging whether all data units in the aggregated data unit are successfully received or not according to a first block acknowledgement frame when the first block acknowledgement frame returned by a main wireless access point is received; wherein the first block acknowledgement frame is filled by the master wireless access point according to a data unit received by the master wireless access point;
and the block acknowledgement frame forwarding module is used for forwarding the first block acknowledgement frame to the auxiliary wireless access point when the aggregated data unit has data units which are not successfully received, so that the auxiliary wireless access point deletes the data units which are received by the auxiliary wireless access point and are successfully received according to the first block acknowledgement frame, and sends the existing data units to the next transmission node.
The embodiment of the invention also provides a data unit transmission device of the wireless access point, which comprises:
the data unit receiving module is used for receiving the aggregated data units and the block acknowledgement request frames of all the wireless stations in the basic service system;
the identity confirmation module is used for confirming whether the identity confirmation module is a main wireless access point of the wireless station to which the received aggregated data unit and the block confirmation request frame belong;
the first data unit processing module is used for storing the successfully received data unit when the first data unit processing module confirms that the first data unit processing module is the main wireless access point, filling a first block of confirmation frame according to the data unit received by the first data unit processing module, and returning the first block of confirmation frame to the wireless station;
the second data unit processing module is used for judging whether the second data unit is an auxiliary wireless access point of the wireless station according to the aggregated data unit when the second data unit processing module is not confirmed to be the main wireless access point, and storing the successfully received data unit when the second data unit processing module is judged to be the auxiliary wireless access point of the wireless station; and after receiving the current block acknowledgement frame forwarded by the wireless station, deleting the data unit which is received by the wireless station and is successfully received, and sending the existing data unit to the next transmission node.
The embodiment of the invention also provides a basic service system, which comprises a wireless station and a wireless access point; wherein the wireless station comprises the data unit transmission device of the wireless station as described above; the wireless access point comprises the data unit transmission means of the wireless access point as described above.
Compared with the prior art, the data unit transmission method, the device and the system of the wireless station and the access point disclosed by the invention have the advantages that after the corresponding auxiliary wireless access point is determined, the wireless station sends the aggregated data unit and the block acknowledgement request frame to the wireless access point in the basic service system; when a first block acknowledgement frame returned by a main wireless access point is received, judging whether the main wireless access point receives all data units in the aggregated data units according to the first block acknowledgement frame; and if not, forwarding the first block acknowledgement frame to the auxiliary wireless access point, so that the auxiliary wireless access point deletes the data unit received by the auxiliary wireless access point and the data unit received by the main wireless access point according to the first block acknowledgement frame, and sends the existing data unit to the next transmission node. By adopting the technical means of the embodiment of the invention, in the process of sending the aggregated data unit by the wireless station, a plurality of wireless access points are allowed to simultaneously receive and analyze the data unit, and the back-off time of the non-associated wireless access points is effectively utilized; when the main wireless access point fails to analyze all the data units, the non-repeated data units solved by the auxiliary wireless access point can be quickly acquired, the retransmission of the data units by the wireless station is reduced, and the network throughput is effectively improved.
Drawings
Fig. 1 is a schematic diagram illustrating steps of a data unit transmission method of a wireless station according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating data unit transmission between a wireless station and a wireless access point according to an embodiment of the present invention;
fig. 3 is a diagram illustrating steps of a data unit transmission method of a wireless station according to a second embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a data unit transmission method of a wireless access point according to a third embodiment of the present invention;
fig. 5 is a schematic structural diagram of a data unit transmission apparatus of a wireless station according to a fourth embodiment of the present invention;
fig. 6 is a schematic structural diagram of a data unit transmission apparatus of a wireless access point according to a fifth embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic step diagram of a method for transmitting a data unit of a wireless station according to an embodiment of the present invention is shown. An embodiment of the present invention provides a method for transmitting a data unit of a wireless station, which is applicable to data unit transmission between a wireless station STA and a wireless access point AP in a Basic Service Set (BSS) system, and the method may be executed by the wireless station, a controller inside the wireless station, or a control device for controlling the wireless station. The embodiment of the present invention is described with a wireless station as an execution subject.
It should be noted that, in the embodiment of the present invention, the basic service system includes at least one wireless station and at least one wireless access point, and each wireless station determines that there is a primary wireless access point.
The data unit transmission method of the wireless station specifically executes, through steps S11 to S14:
s11, determining an auxiliary wireless access point corresponding to the wireless station; the auxiliary wireless access point is located in a basic service system where the wireless station is located.
In the embodiment of the invention, the wireless station judges whether the wireless access point meeting the conditions exists in the basic service system according to a preset rule, and determines the wireless access point as the auxiliary wireless access point.
Preferably, the step S11 specifically includes:
s111, detecting whether a wireless access point meeting preset conditions exists in the basic service system; wherein the preset conditions are as follows: the wireless signal strength is greater than a preset threshold value and is not the main wireless access point;
and S112, determining an auxiliary wireless access point corresponding to the wireless station according to the wireless access point meeting the preset condition.
Specifically, the wireless station may detect in which coverage areas of the wireless access points the wireless station is located according to a signal strength of a Beacon frame (Beacon RSSI). And determining the non-associated wireless access point with the wireless signal intensity larger than a preset threshold value in the basic service system as an auxiliary wireless access point in the data unit transmission process with the main wireless access point.
It is to be understood that the preset threshold may be set according to an actual data transmission condition and a wireless signal strength range of the wireless access point, and is not specifically limited herein.
As a preferred embodiment, after the step S11, the method further comprises a step S11':
s11', the identity information of the auxiliary wireless access point is marked in an aggregation data unit.
And the identity information of the auxiliary wireless access point is used for triggering the wireless access point in the basic service system to determine whether the wireless access point is the auxiliary wireless access point of the wireless station or not after receiving the aggregated data unit.
After determining the corresponding auxiliary wireless access point, the wireless station marks the identity information of the auxiliary wireless access point, such as the number of the wireless access point, in the data header part of the aggregated data unit to be sent in the communication round, so as to broadcast the information of the determined auxiliary wireless access point.
It can be understood that, in the embodiment of the present invention, if there is no wireless access point satisfying the preset condition in the basic service system, the wireless access point does not mark the secondary wireless access point, and directly sends the aggregated data unit to the primary wireless access point.
S12, sending an aggregation data unit and a block acknowledgement request frame to a wireless access point in the basic service system; wherein the aggregate data unit is composed of a plurality of data units.
In the data transmission process, refer to fig. 2, which is a schematic diagram illustrating data unit transmission between a wireless station and a wireless access point according to a first embodiment of the present invention. And the wireless station broadcasts the aggregated data unit and a corresponding Block Acknowledgement Request (BAR) frame together, so that a wireless access point in the basic service system can receive a data signal sent by the wireless station, analyze the corresponding data unit and store the data unit.
It should be noted that the Aggregate data unit is an Aggregate MAC layer Protocol data unit (a-MPDU), which is formed by aggregating a plurality of MAC layer Protocol data units (MPDUs) together by using Association Identifiers (AIDs).
When the wireless station sends the aggregate data unit and the block acknowledgement request frame, the main wireless access point can receive and analyze the data unit in all or part of the aggregate data unit, and store the data unit analyzed by the main wireless access point. And, the primary wireless access point can fill a Block Acknowledgement (BA) frame according to the wireless protocol specification according to the data unit received and stored by itself, and return the Block acknowledgement frame BA to the wireless station after a short inter-frame space SIFS, thereby completing one data exchange.
In the embodiment of the present invention, the auxiliary wireless access point backs off in the process of the communication between the wireless station and the main wireless access point, but in the back-off time, the auxiliary wireless access point also receives the aggregated data unit and the corresponding block acknowledgement request frame sent by the wireless station, analyzes the data unit in all or part of the aggregated data unit, and stores the data unit analyzed by the auxiliary wireless access point.
S13, when a first block of acknowledgement frame returned by a main wireless access point is received, judging whether the main wireless access point receives all data units in the aggregated data units or not according to the first block of acknowledgement frame; wherein the first block acknowledgement frame is filled by the master wireless access point according to the data unit received by the master wireless access point.
S14, when the main wireless access point does not receive all the data units in the aggregated data units, the first block acknowledgement frame is forwarded to the auxiliary wireless access point, so that the auxiliary wireless access point deletes the data units received by the auxiliary wireless access point and the main wireless access point according to the first block acknowledgement frame, and sends the existing data units to the next transmission node.
After the wireless station receives the first block acknowledgement frame BA returned by the primary wireless access point, if the primary wireless access point fails to successfully parse out all the data units, the wireless station forwards the first block acknowledgement frame to the previously determined secondary wireless access point.
And after receiving the first block acknowledgement frame, the auxiliary wireless access point reserves the data unit which is not solved by the main wireless access point and is solved by the auxiliary wireless access point, and deletes other data units (namely the data unit which is solved by the main wireless access point). And after deleting the data unit, according to the existing data unit, filling a Block Acknowledgement (BA) frame according to the wireless protocol specification, returning the BA frame to the wireless station after a short interframe space (SIFS), and sending the existing data unit to the next transmission node.
It should be noted that the next transmission node may be the primary wireless access point, a gateway device, a switch, or the like; or other secondary wireless access points, and finally transmit the data units to the primary wireless access point, the gateway device, or the switch via the other secondary wireless access points.
Preferably, the wireless station merges the first block of acknowledgement frame sent by the primary wireless access point and the second block of acknowledgement frame sent by the secondary wireless access point, determines whether all data units in the aggregated data unit are received, and if not, retransmits the data units that are not successfully resolved by the primary and secondary wireless access points.
Further, when the next transmission node is the primary wireless access point, the primary wireless access point performs rearrangement and deduplication processing on the data units received by the primary wireless access point and the data units sent by the secondary wireless access point, so as to complete data unit transmission in the current communication round. When the next transmission node is the gateway device or the switch, the master wireless access point needs to send the data unit received by the master wireless access point to the next transmission node, and the next transmission node performs rearrangement and de-duplication processing on the received data unit.
It can be understood that the main wireless access point and the auxiliary wireless access point may also send the data units stored by themselves to the gateway device, and the gateway device performs rearrangement and deduplication processing on the data units, which does not affect the beneficial effects obtained by the present invention.
The embodiment of the invention provides a data unit transmission method of a wireless station, wherein the wireless station sends an aggregated data unit and a block acknowledgement request frame to a wireless access point in a basic service system after determining a corresponding auxiliary wireless access point; when a first block acknowledgement frame returned by a main wireless access point is received, judging whether the main wireless access point receives all data units in the aggregated data units according to the first block acknowledgement frame; and if not, forwarding the first block acknowledgement frame to the auxiliary wireless access point, so that the auxiliary wireless access point deletes the data unit received by the auxiliary wireless access point and the data unit received by the main wireless access point according to the first block acknowledgement frame, and sends the existing data unit to the next transmission node. By adopting the technical means of the embodiment of the invention, in the process of sending the aggregated data unit by the wireless station, a plurality of wireless access points are allowed to simultaneously receive and analyze the data unit, and the back-off time of the non-associated wireless access points is effectively utilized; when the main wireless access point fails to analyze all the data units, the non-repeated data units analyzed by the auxiliary wireless access point can be quickly acquired, the retransmission of the data units by the wireless station is reduced, and the network throughput is effectively improved.
As a preferred implementation manner, referring to fig. 3, a schematic step diagram of a data unit transmission method of a wireless station in a second embodiment of the present invention is shown. The number of the determined auxiliary wireless access points is not less than two.
Then, when there are two or more secondary wireless access points, after step S11, the method further includes:
s11', and serial numbers of the auxiliary wireless access points are marked in the aggregation data unit.
In the embodiment of the present invention, after determining the corresponding auxiliary wireless access points, the wireless station ranks each auxiliary wireless access point, and marks the identity information and the corresponding sequence number of the auxiliary wireless access point in the data header portion of the aggregated data unit to be sent in the communication round.
The identity signal and the sequence number are used for triggering a wireless access point in the basic service system to determine whether the wireless access point is an auxiliary wireless access point of the wireless station after receiving the aggregated data unit. And when the wireless station is confirmed to be the auxiliary wireless access point of the wireless station, the wireless station is confirmed to be the second auxiliary wireless access point.
It can be understood that the wireless station may rank each auxiliary wireless access point according to the wireless signal strength of each auxiliary wireless access point, and may also rank each auxiliary wireless access point according to other preset ranking rules, without affecting the beneficial effects obtained by the present invention.
As a preferred embodiment, when there are two or more secondary wireless access points, the step S14 specifically performs, through steps S141 to S145:
s141, when the main wireless access point does not receive all the data units in the aggregated data units, taking the first auxiliary wireless access point as the current auxiliary wireless access point according to the sequence number of the auxiliary wireless access point;
s142, forwarding the first block acknowledgement frame as a current block acknowledgement frame to the current auxiliary wireless access point, so that the current auxiliary wireless access point deletes the data unit which is received by the current auxiliary wireless access point and is successfully received according to the current block acknowledgement frame, sends the existing data unit to the next transmission node, and returns a second block acknowledgement frame; wherein the second block acknowledgement frame is populated by the secondary wireless access point based on its existing data units;
s143, merging the second block confirmation frame and the current block confirmation frame to update the current block confirmation frame;
s144, judging whether all data units in the aggregated data unit have been successfully received according to the current block confirmation frame;
s145, when the aggregated data unit has data units which are not successfully received and the current auxiliary wireless access point is not the last auxiliary wireless access point, taking the next auxiliary wireless access point as the current auxiliary wireless access point until all the auxiliary wireless access points are traversed, or judging that all the data units in the aggregated data unit are successfully received.
In the embodiment of the present invention, after the wireless station receives the first block acknowledgement frame returned by the primary wireless access point, if the primary wireless access point fails to successfully analyze all data units, the wireless station will use the first block acknowledgement frame as the current block acknowledgement frame, and forward the current block acknowledgement frame to the previously determined secondary wireless access point with the first sequence number after a short interframe space SIFS.
And after the first auxiliary wireless access point receives the current block confirmation frame, reserving the data units which are not solved by the main wireless access point but are solved by the first auxiliary wireless access point, and deleting other data units. And after deleting the data unit, filling a block acknowledgement frame according to the existing data unit per se and the wireless protocol specification, returning the block acknowledgement frame to the wireless station after a short interframe space SIFS, and sending the existing data unit to the next transmission node, such as the main wireless access point.
And the wireless station combines the first block acknowledgement frame and the second block acknowledgement frame and updates the combined first block acknowledgement frame and the second block acknowledgement frame into a current block acknowledgement frame. According to the current block acknowledgement frame, if the data unit still exists in the aggregated data unit and is not successfully received, the wireless station forwards the current block acknowledgement frame to the auxiliary wireless access point with the second sequence number determined previously after a short interframe space (SIFS) is obtained.
And after the second auxiliary wireless access point receives the current block confirmation frame, the data units which are not solved by the main wireless access point and the last auxiliary wireless access point but are solved by the second auxiliary wireless access point are reserved, and other data units are deleted. And after deleting the data unit, filling a block acknowledgement frame according to the existing data unit of the wireless station according to the wireless protocol specification, returning the block acknowledgement frame to the wireless station after a short interframe space SIFS, and sending the existing data unit to the next transmission node.
And the wireless station merges the current block acknowledgement frame and the second block acknowledgement frame, updates the current block acknowledgement frame, judges whether all the data units in the aggregated data unit are successfully received, and so on until all the auxiliary wireless access points finish traversing, or judges that all the data units in the aggregated data unit are successfully received.
As a preferred embodiment, the method further comprises step S15:
s15, after all the auxiliary wireless access points finish traversing, using the current block acknowledgement frame as a target block acknowledgement frame, and judging whether all the data units in the aggregated data unit are successfully received according to the target block acknowledgement frame; and the number of the first and second groups,
and when the data unit in the aggregated data unit is not successfully received, retransmitting the data unit which is not received according to the target block acknowledgement frame.
By adopting the technical means of the embodiment of the invention, the number of the auxiliary wireless access points determined by the wireless station is not limited to one, and in the process of sending the aggregated data unit by the wireless station, a plurality of wireless access points are allowed to simultaneously receive and analyze the data unit, so that the back-off time of the non-associated wireless access points is effectively utilized; when the main wireless access point fails to analyze all the data units, the non-repeated data units solved by each auxiliary wireless access point can be quickly acquired, the retransmission of the data units by the wireless station is reduced, and the network throughput is effectively improved. And each auxiliary wireless access point is sequenced, and is sequentially triggered to process and return the existing data unit according to the block acknowledgement frame returned by the main wireless access point, so that the problem of repeated transmission or missing transmission of the data unit can be effectively avoided, and the transmission efficiency of the wireless station to the data unit is improved.
As a preferred implementation manner, referring to fig. 3, in the data unit transmission method of the wireless station according to the embodiment of the present invention, after step S12, the method further includes:
s12', when the first block acknowledgement frame returned by the main wireless access point is not received, the block acknowledgement request frame is retransmitted to the wireless access point in the basic service system within the preset retransmission times.
In the embodiment of the present invention, if the wireless station waits for a short inter-frame space SIFS after sending the aggregate data unit and the corresponding block ack request frame, it tries to receive a block ack frame returned by the primary wireless access point. And if the block acknowledgement frame returned by the main wireless access point is not received after a short interframe space, retransmitting the block acknowledgement request frame, and waiting for a short interframe space SIFS to try to receive the block acknowledgement frame returned by the main wireless access point.
By adopting the technical means of the embodiment of the invention, the wireless station is triggered to execute the block acknowledgement request frame retransmission operation for a certain number of times when the wireless station does not receive the first block acknowledgement frame returned by the main wireless access point by setting a maximum retransmission time, namely the preset retransmission time N, so that the successful communication probability between the wireless station and the main wireless access point is improved.
Further, after the step S12', the method further includes:
and S12', when the number of times of retransmitting the block acknowledgement request frame to the wireless access point in the basic service system reaches the preset retransmission number and the first block acknowledgement frame returned by the main wireless access point is not received yet, the aggregated data unit and the block acknowledgement request frame are sent to the wireless access point in the basic service system again.
In the embodiment of the present invention, if the first block acknowledgement frame returned by the primary wireless access point is not received after retransmitting the block acknowledgement request frame N times, it indicates that the data signal transmission of the communication round is failed, and an overall retransmission is required. By adopting the technical means of the embodiment of the invention, the successful communication probability between the wireless station and the main wireless access point can be improved.
As a preferred implementation manner, refer to fig. 4, which is a schematic step diagram of a data unit transmission method of a wireless access point in a third embodiment of the present invention. A third embodiment of the present invention provides a data unit transmission method for a wireless access point, which is applicable to data unit transmission between a wireless station STA and a wireless access point AP in a Basic Service Set (BSS) system, and the method can be executed by the wireless access point or a controller thereof, and includes steps S31 to S34:
s31, receiving aggregate data units and block acknowledgement request frames of all wireless stations in the basic service system;
s32, confirming whether the self is a main wireless access point of the wireless station to which the received aggregate data unit and block confirmation request frame belong;
s33, if yes, storing the successfully received data unit, filling a first block of acknowledgement frame according to the data unit received by the wireless station, and returning the first block of acknowledgement frame to the wireless station;
s34, if not, judging whether the aggregation data unit is an auxiliary wireless access point of the wireless station or not according to the aggregation data unit, and storing the successfully received data unit when the aggregation data unit is judged to be the auxiliary wireless access point of the wireless station; and after receiving the block acknowledgement frame forwarded by the wireless station, deleting the data unit which is received by the wireless station and is successfully received, and sending the existing data unit to the next transmission node.
It should be noted that, the data header part of the aggregated data unit is labeled with the identity information and the serial number of the secondary wireless access point corresponding to the wireless station.
In the embodiment of the present invention, each wireless access point in the basic service system receives data sent by all wireless stations in the basic service system, and determines which wireless station is a primary wireless access point or an auxiliary wireless access point according to the data header portion of the aggregated data unit.
And when the wireless station is judged to be a main wireless access point of a certain wireless station, storing the successfully received data unit, filling a first block of acknowledgement frame according to a preset wireless protocol specification, and returning the first block of acknowledgement frame to the wireless station after a short interframe space (SIFS). And simultaneously, monitoring and replying a retransmission block confirmation request frame sent by the wireless station in real time until the wireless station indicates that the retransmission is correctly received or abandoned through an SN (service number) code according to a wireless protocol. And performing rearrangement and de-duplication operations on the stored data units according to the specification, or sending the data units to the next transmission node, such as a gateway device, for performing rearrangement and de-duplication operations.
When judgingWhen the wireless access point is disconnected, the successfully received data unit is stored, the sequence number of the wireless access point is judged, and the waiting time of the wireless access point is determined to be t retrytime +k×(SIFS+t BA ) (ii) a Wherein, t retrytime A preset waiting threshold for waiting for the primary radio access point to retransmit the first block acknowledgement frame; k is the serial number of the auxiliary wireless access point, SIFS is a short interframe space, t BA The transmission time of the frame is acknowledged for a block.
Further, after the auxiliary wireless access point receives a current block acknowledgement frame sent by the wireless station during the waiting period, according to the current block acknowledgement frame, data units which are not solved by the main wireless access point and the last auxiliary wireless access point but are solved by the main wireless access point and the last auxiliary wireless access point are reserved, and other data units are deleted. And after deleting the data unit, filling a block acknowledgement frame according to the existing data unit of the wireless station per se according to the wireless protocol specification, returning the block acknowledgement frame to the wireless station after a short interframe space SIFS, and sending the existing data unit to the next transmission node according to the specification, such as a main wireless access point or gateway equipment for rearrangement or deduplication.
And when judging that the wireless access point is not the main wireless access point or the auxiliary wireless access point, discarding the received data unit.
The embodiment of the invention provides a data unit transmission method of a wireless access point, wherein in the process of sending aggregate data units by wireless stations, each wireless access point can receive and analyze the data units sent by all the wireless stations, thereby effectively utilizing the back-off time of non-associated wireless access points; when the main wireless access point fails to analyze all the data units, the non-repeated data units analyzed by each auxiliary wireless access point can be quickly acquired, the retransmission of the data units by the wireless station is reduced, and the network throughput is effectively improved.
Fig. 5 is a schematic structural diagram of a data unit transmission apparatus of a wireless station according to a fourth embodiment of the present invention. An embodiment of the present invention provides a data unit transmission apparatus 40 of a wireless station, including: an auxiliary wireless access point determining module 41, a data unit sending module 42, a block acknowledgement frame judging module 43 and a block acknowledgement frame forwarding module 44; wherein the content of the first and second substances,
the auxiliary wireless access point determining module 41 is configured to determine an auxiliary wireless access point corresponding to the wireless station; the auxiliary wireless access point is positioned in a basic service system where the wireless station is positioned;
the data unit sending module 42 is configured to send an aggregate data unit and a block acknowledgement request frame to a wireless access point in the basic service system; the aggregation data unit consists of a plurality of data units;
the block acknowledgement frame determining module 43 is configured to, when receiving a first block acknowledgement frame returned by a master wireless access point, determine whether the master wireless access point receives all data units in the aggregated data units according to the first block acknowledgement frame; wherein the first block acknowledgement frame is filled by the master wireless access point according to a data unit received by the master wireless access point;
the block acknowledgement frame forwarding module 44 is configured to forward the first block acknowledgement frame to the auxiliary wireless access point when the main wireless access point does not receive all the data units in the aggregated data unit, so that the auxiliary wireless access point deletes the data units received by itself and by the main wireless access point according to the first block acknowledgement frame, and sends the existing data units to the next transmission node.
It should be noted that, the data unit transmission apparatus of a radio site according to the embodiment of the present invention is configured to execute all the process steps of the data unit transmission method of the radio site according to the first embodiment or the second embodiment, and the working principles and beneficial effects of the two are in one-to-one correspondence, which is not described again.
The embodiment of the invention provides a data unit transmission device of a wireless station, wherein after an auxiliary wireless access point determining module determines a corresponding auxiliary wireless access point, a data unit sending module sends an aggregated data unit and a block acknowledgement request frame to the wireless access point in a basic service system; when a first block acknowledgement frame returned by a main wireless access point is received, a block acknowledgement frame judging module judges whether the main wireless access point receives all data units in the aggregated data units according to the first block acknowledgement frame; if not, the block acknowledgement frame forwarding module forwards the first block acknowledgement frame to the auxiliary wireless access point, so that the auxiliary wireless access point deletes the data unit received by the auxiliary wireless access point and the data unit received by the main wireless access point according to the first block acknowledgement frame, and sends the existing data unit to the next transmission node. By adopting the technical means of the embodiment of the invention, in the process of sending the aggregated data unit by the wireless station, a plurality of wireless access points are allowed to simultaneously receive and analyze the data unit, and the back-off time of the non-associated wireless access points is effectively utilized; when the main wireless access point fails to analyze all the data units, the non-repeated data units solved by the auxiliary wireless access point can be quickly acquired, the retransmission of the data units by the wireless station is reduced, and the network throughput is effectively improved.
Fig. 6 is a schematic structural diagram of a data unit transmission apparatus of a wireless access point according to a fifth embodiment of the present invention. An embodiment of the present invention provides a data unit transmission apparatus 50 for a wireless access point, including: a data unit receiving module 51, an identity confirmation module 52, a first data unit processing module 53 and a second data unit processing module 52; wherein the content of the first and second substances,
the data unit receiving module 51 is configured to receive aggregate data units and block acknowledgement request frames of all wireless stations in the basic service system;
the identity confirmation module 52 is configured to confirm whether the identity confirmation module is a master wireless access point of a wireless station to which the received aggregated data unit and block confirmation request frame belong;
the first data unit processing module 53 is configured to, when it is determined that the first data unit is the master wireless access point, store the successfully received data unit, fill a first block of acknowledgement frame according to the data unit received by the first data unit processing module, and return the first block of acknowledgement frame to the wireless station;
the second data unit processing module 54 is configured to, when it is determined that the second data unit is not the primary wireless access point, determine whether the second data unit is an auxiliary wireless access point of the wireless station according to the aggregated data unit, and store the successfully received data unit when the second data unit is determined to be an auxiliary wireless access point of the wireless station; and after receiving the current block acknowledgement frame forwarded by the wireless station, deleting the data unit which is received by the wireless station and is successfully received, and sending the existing data unit to the next transmission node.
It should be noted that the data unit transmission apparatus of a wireless access point according to the embodiment of the present invention is configured to execute all the process steps of the data unit transmission method of a wireless access point according to the third embodiment, and the working principles and beneficial effects of the two are in one-to-one correspondence, so that details are not repeated.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-only memory (ROM), a Random Access Memory (RAM), or the like.
The fifth embodiment of the invention also provides a basic service system, which comprises a wireless station and a wireless access point; wherein the wireless station comprises the data unit transmission device 40 of the wireless station according to the fourth embodiment; the wireless access point comprises the data unit transmission device 50 of the wireless access point according to the fifth embodiment.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method for data unit transmission in a wireless station, comprising:
determining an auxiliary wireless access point corresponding to the wireless station; the auxiliary wireless access point is positioned in a basic service system where the wireless station is positioned;
sending aggregate data units and block acknowledgement request frames to a wireless access point in the basic service system; the aggregation data unit consists of a plurality of data units;
when a first block acknowledgement frame returned by a main wireless access point is received, judging whether the main wireless access point receives all data units in the aggregated data units according to the first block acknowledgement frame; wherein the first block acknowledgement frame is filled by the master wireless access point according to a data unit received by the master wireless access point;
when the main wireless access point does not receive all the data units in the aggregated data units, forwarding the first block acknowledgement frame to the auxiliary wireless access point, so that the auxiliary wireless access point deletes the data units received by the auxiliary wireless access point and received by the main wireless access point according to the first block acknowledgement frame, sends the existing data units to a next transmission node, and returns a second block acknowledgement frame; wherein the second block acknowledgement frame is populated by the secondary wireless access point based on existing data units of the secondary wireless access point; the next transmission node is the main wireless access point, the gateway device or the switch.
2. The method for transmitting data units of a wireless station according to claim 1, wherein the determining the secondary wireless access point corresponding to the wireless station specifically includes:
detecting whether a wireless access point meeting a preset condition exists in the basic service system; wherein the preset conditions are as follows: the wireless signal strength is greater than a preset threshold value and is not the main wireless access point;
and determining an auxiliary wireless access point corresponding to the wireless station according to the wireless access point meeting the preset condition.
3. The method of claim 1, wherein after the determining the secondary wireless access point to which the wireless station corresponds, the method further comprises:
identify information of the secondary wireless access point in the aggregated data unit; and the identity information of the auxiliary wireless access point is used for triggering the wireless access point in the basic service system to determine whether the wireless access point is the auxiliary wireless access point of the wireless station or not after receiving the aggregated data unit.
4. The method of claim 3, wherein when the secondary wireless access points are two or more, after the determining the secondary wireless access point to which the wireless station corresponds, the method further comprises:
and marking the serial number of each auxiliary wireless access point in the aggregation data unit.
5. The method according to claim 4, wherein when the primary wireless access point does not receive all data units in the aggregated data unit, the method forwards the first block acknowledgement frame to the secondary wireless access point, so that the secondary wireless access point deletes the data unit received by itself and received by the primary wireless access point according to the first block acknowledgement frame, and sends the existing data unit to a next transmission node, specifically comprising:
when the main wireless access point does not receive all the data units in the aggregated data units, taking a first auxiliary wireless access point as a current auxiliary wireless access point according to the sequence number of the auxiliary wireless access point;
forwarding the first block acknowledgement frame as a current block acknowledgement frame to the current auxiliary wireless access point, so that the current auxiliary wireless access point deletes the data unit which is received by the current auxiliary wireless access point and successfully received according to the current block acknowledgement frame, sends the existing data unit to the next transmission node, and returns a second block acknowledgement frame; wherein the second block acknowledgement frame is populated by the secondary wireless access point based on its existing data units;
merging the second block acknowledgment frame and the current block acknowledgment frame to update the current block acknowledgment frame;
judging whether all data units in the aggregated data unit have been successfully received or not according to the current block confirmation frame;
and when the aggregated data unit has data units which are not successfully received and the current auxiliary wireless access point is not the last auxiliary wireless access point, taking the next auxiliary wireless access point as the current auxiliary wireless access point until all the auxiliary wireless access points finish traversing, or judging that all the data units in the aggregated data unit are successfully received.
6. The method for data unit transmission by a wireless station according to claim 5, wherein the method further comprises:
after all the auxiliary wireless access points finish traversing, taking the current block confirmation frame as a target block confirmation frame, and judging whether all the data units in the aggregated data unit are successfully received or not according to the target block confirmation frame;
and when the data units in the aggregated data unit are unsuccessfully received, retransmitting the data units which are not received according to the target block acknowledgement frame.
7. A method for data unit transmission in a wireless access point, comprising:
receiving aggregate data units and block acknowledgement request frames of all wireless stations in a basic service system;
confirming whether the wireless access point is a main wireless access point of a wireless station to which the received aggregate data unit and block confirmation request frame belong;
if yes, storing the successfully received data unit, filling a first block of acknowledgement frame according to the data unit received by the wireless station, and returning the first block of acknowledgement frame to the wireless station;
if not, judging whether the aggregation data unit is an auxiliary wireless access point of the wireless station or not according to the aggregation data unit, and storing the successfully received data unit when the aggregation data unit is judged to be the auxiliary wireless access point of the wireless station; after receiving the current block acknowledgement frame forwarded by the wireless station, deleting the data unit which is received by the wireless station and successfully received by the wireless station, filling a second block acknowledgement frame according to the existing data unit of the wireless station, returning the second block acknowledgement frame to the wireless station, and sending the existing data unit to the next transmission node; the next transmission node is the master wireless access point, the gateway device or the switch.
8. An apparatus for transmitting a data unit of a wireless station, comprising:
an auxiliary wireless access point determining module, configured to determine an auxiliary wireless access point corresponding to the wireless station; the auxiliary wireless access point is positioned in a basic service system where the wireless station is positioned;
a data unit sending module, configured to send an aggregated data unit and a block acknowledgement request frame to a wireless access point in the basic service system; the aggregation data unit consists of a plurality of data units;
a block acknowledgement frame judgment module, configured to, when receiving a first block acknowledgement frame returned by a master wireless access point, judge, according to the first block acknowledgement frame, whether the master wireless access point receives all data units in the aggregated data units; wherein the first block acknowledgement frame is filled by the master wireless access point according to a data unit received by the master wireless access point;
a block acknowledgement frame forwarding module, configured to forward the first block acknowledgement frame to the auxiliary wireless access point when the main wireless access point does not receive all data units in the aggregated data unit, so that the auxiliary wireless access point deletes, according to the first block acknowledgement frame, a data unit received by the auxiliary wireless access point and received by the main wireless access point, and sends an existing data unit to a next transmission node, and returns a second block acknowledgement frame; wherein the second block acknowledgement frame is populated by the secondary wireless access point based on existing data units of the secondary wireless access point; the next transmission node is the main wireless access point, the gateway device or the switch.
9. An apparatus for transmitting a data unit of a wireless access point, comprising:
the data unit receiving module is used for receiving the aggregated data units and the block acknowledgement request frames of all the wireless stations in the basic service system;
the identity confirmation module is used for confirming whether the identity confirmation module is a main wireless access point of a wireless station to which the received aggregated data unit and the block confirmation request frame belong;
the first data unit processing module is used for storing the successfully received data unit when the wireless access point is confirmed to be the main wireless access point, filling a first block of confirmation frame according to the data unit received by the first data unit processing module, and returning the first block of confirmation frame to the wireless station;
the second data unit processing module is used for judging whether the second data unit is an auxiliary wireless access point of the wireless station according to the aggregated data unit when the second data unit processing module is not confirmed to be the main wireless access point, and storing the successfully received data unit when the second data unit processing module is judged to be the auxiliary wireless access point of the wireless station; after receiving the current block acknowledgement frame forwarded by the wireless station, deleting the data unit which is received by the wireless station and successfully received by the wireless station, filling a second block acknowledgement frame according to the existing data unit of the wireless station, returning the second block acknowledgement frame to the wireless station, and sending the existing data unit to the next transmission node; the next transmission node is the main wireless access point, the gateway device or the switch.
10. A basic service system comprising a wireless station and a wireless access point; wherein the radio station comprises data unit transmission means of the radio station according to claim 8; the wireless access point comprises data unit transmission means of the wireless access point according to claim 9.
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