CN105409292A - Data communication method, station, and system - Google Patents

Data communication method, station, and system Download PDF

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Publication number
CN105409292A
CN105409292A CN201380078450.6A CN201380078450A CN105409292A CN 105409292 A CN105409292 A CN 105409292A CN 201380078450 A CN201380078450 A CN 201380078450A CN 105409292 A CN105409292 A CN 105409292A
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access point
station
message
access
channel
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CN201380078450.6A
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CN105409292B (en
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杨浔
姜艳平
赵牧
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

An embodiment of the present invention discloses a data communication method. The method comprises: a station sending a serial number to access points in a working region of the station, the serial number being used for indicating a sequence of responding to the station by the access points; when the station needs to access a channel by means of an associated first access point, the station receiving sending allowed messages returned sequentially according to the serial number by another access point in the working region of the station; and the station accessing the channel by means of the first access point, and performing data communication with the first access point. Embodiments of the present invention also disclose a station and a system. By using the present invention, useless power consumption of an OBSS system can be reduced, the communications efficiency can be improved, and communications interference can be reduced.

Description

Data communication method, site and system
Data communication method, site and system
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a data communication method, a station, and a system. Background
With the rapid development of wireless communication technology, wireless devices such as Access Points (APs) and Stations (STAs) are increasingly deployed, and in a densely deployed wireless local area network, due to the requirement of continuous network deployment, there may be a region of signal overlap between adjacent Basic Service Sets (BSSs). Since the spectrum resources are limited, these neighboring BSSs may operate on the same channel, thereby causing the neighboring BSSs to form an Overlapping Basic Service Set (OBSS). The STAs in the overlapping area of adjacent BSSs will be affected by multiple BSSs in the sensing range when communicating, so that the STAs in the overlapping area are susceptible to severe interference after channel access.
In the prior art, a method for implementing data communication by an STA is implemented mainly based on a Request To Send (RTS)/Clear To Send (CTS) protocol, that is, an RTS/CTS protocol, and specifically includes the following steps: the STA broadcasts RTS to request data communication with the AP to be communicated, the AP to be communicated broadcasts CTS after receiving the RTS, the STA is allowed to carry out data communication, other STAs set own Network Allocation Vector (NAV) when receiving the RTS and the CTS, and other STAs can not send messages again within the time of NAV configuration, so that the phenomenon that other STAs contend for channels when the STA carries out data communication is avoided. However, the prior art method is no longer applicable to STAs in an overlap region in an OBSS system. As shown in fig. 1, STA1 is located in the overlapping region of BSS1 and BSS2, API and AP2 are located in the working area of STA1, and STA2 is located outside the working area of STA 1. When STA1 wants to communicate with the API corresponding to BSS1, it broadcasts RTS, and if AP2 receives RTS normally, it sets its NAV and does not interfere with the communication between STA1 and the API, but if AP2 does not receive RTS normally because it is communicating with STA2 at this time, it will affect STA1 to receive CTS returned from the API, and even if STA1 receives CTS returned from the API, the communication between STA1 and the API will still form cross interference with the communication between STA2 and AP 2; or AP2 successfully receives the RTS and sets its NAV, but at this time STA2 is outside the working area of STA1, so STA2 will not set its NAV, and it may still initiate communication like AP2, causing an increase in useless power consumption of the system, and a decrease in communication efficiency of the system, and STA2 initiating communication to AP2, which will cause AP2 to be unable to set the NAV again according to the data message that STA1 sends to the API, so AP2 will possibly communicate with STA2 or initiate communication to STA1 when STA1 sends a data message to the API, thus causing interference to the communication of STA1 with the API. When the API sends an RTS to STA1 to initiate communication, the same is true and will not be described further. As can be seen from the above description, in the OBSS system, the problems of increased system useless power consumption, low communication efficiency, and more communication interference exist in the prior art. Disclosure of Invention
The embodiment of the invention provides a data communication method, a station and a system, which aim to solve the problems of high useless power consumption, low communication efficiency and more communication interference of the system in an OBSS system.
A first aspect of an embodiment of the present invention provides a data communication method, which may include:
the station sends a sequence number to access points in the station working area, wherein the sequence number is used for indicating the sequence of each access point for responding to the station;
when the station and the associated first access point confirm to access the channel through the first access point, receiving the transmission permission messages sequentially returned by other access points in the station working area according to the sequence number;
and the station accesses a channel through the first access point and carries out data communication with the first access point. In a first possible implementation manner of the first aspect, the receiving, when the station and the associated first access point confirm that the channel is accessed through the first access point, a transmission permission message sequentially returned by other access points in the station operating area according to the sequence number includes:
the station broadcasts a request sending message and requests an associated first access point to access a channel; the station receives a first transmission permission message returned by the first access point according to the sequence number, and then receives transmission permission messages returned by other access points in the station working area in sequence according to the sequence number, the other access points at least comprise a second access point, the first transmission permission message is used for the first access point to permit the station to access the channel and instruct other stations in the first access point working area to set own network allocation vectors, and the message allowing transmission returned by the second access point is a second message allowing transmission, the second message allowing transmission is used for indicating the second access point and other stations located in the working area of the second access point to respectively set own network allocation vectors, and the network allocation vectors are used for configuring the silent time of the equipment.
In a second possible implementation manner of the first aspect, the receiving, when the station and the associated first access point confirm that the channel is accessed through the first access point, a transmission permission message sequentially returned by other access points in the station operating area according to the sequence number includes:
the station receives a request sending message of the first access point and broadcasts a transmission permission message; and the station receives the transmission permission messages returned by other access points in the station working area in sequence according to the sequence numbers, the other access points at least comprise a second access point, the transmission permission messages returned by the second access point are second transmission permission messages, the second transmission permission messages are used for indicating the second access point and other stations in the second access point working area to respectively set own network allocation vectors, and the network allocation vectors are used for configuring the silent time of the equipment.
With reference to the first aspect or with reference to the first or second possible implementation manner of the first aspect, in a third possible implementation manner, the time for the other access points to return the permission message is determined according to the sequence number corresponding to each access point.
With reference to the first possible implementation manner of the first aspect, in a fourth possible implementation manner, after the station receives the first clear-to-send message returned by the first access point, the method further includes:
and the station broadcasts a confirmation message so that the other access points return the transmission permission messages in sequence according to the sequence number after receiving the confirmation message.
With reference to the first aspect or with reference to the first, second, third, or fourth possible implementation manner of the first aspect, in a fifth possible implementation manner, if the station and the associated first access point confirm that the channel is accessed through the first access point, and a permission-to-send message returned by the other access point is not received within a preset time, it is determined that the channel is busy, and data communication cannot be performed.
With reference to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner, after the station determines that a channel is busy and data communication cannot be performed, the method further includes:
the station sends a cancellation message to the first access point so that the first access point releases resources reserved for the station.
With reference to the first aspect or with reference to the first, second, third, fourth, fifth, or sixth possible implementation manner of the first aspect, in a seventh possible implementation manner, the message allowing the other access point to send back includes duration information that the other access point allows the station to occupy the channel.
A second aspect of an embodiment of the present invention provides a station, which may include:
a sending unit, configured to send a sequence number to an access point in the station working area, where the sequence number is used to indicate an order in which each access point replies to the station;
a receiving unit, configured to receive a transmission permission message that is returned in sequence by other access points in the station working area according to the sequence numbers when the station and the associated first access point confirm that the channel is accessed through the first access point;
and the access unit is used for accessing a channel through the first access point and carrying out data communication with the first access point.
In a first possible implementation manner of the second aspect, the sending unit is specifically configured to broadcast a request sending message, and request an access channel from an associated first access point;
the receiving unit is specifically configured to receive a first permission transmission message returned by the first access point according to the sequence number, and then receive permission transmission messages sequentially returned by other access points in the station working area according to the sequence number, where the other access points include at least a second access point, the first permission transmission message is used for the first access point to permit the station to access the channel and instruct other stations in the first access point working area to set their own network allocation vectors, and the transmission permission message returned by the second access point is a second transmission permission message, the second transmission permission message is used for indicating that the second access point and other stations located in the working area of the second access point respectively set own network allocation vectors, and the network allocation vectors are used for configuring the silent time of the equipment.
In a second possible implementation manner of the second aspect, the receiving unit is specifically configured to receive a request to send message of the first access point; receiving the transmission permission messages returned by other access points in the station working area in sequence according to the sequence numbers, wherein the other access points at least comprise a second access point, the transmission permission messages returned by the second access point are second transmission permission messages, the second transmission permission messages are used for indicating the second access point and other stations in the second access point working area to set own network allocation vectors respectively, and the network allocation vectors are used for configuring equipment silence time; the sending unit is further configured to broadcast a transmission permission message after the receiving unit receives the request transmission message of the first access point.
With reference to the second aspect or with reference to the first or second possible implementation manner of the second aspect, in a third possible implementation manner, the time for the other access points to return the permission-to-send message is determined according to the sequence number corresponding to each access point.
With reference to the third possible implementation manner of the second aspect, in a fourth possible implementation manner, after the receiving unit receives the first transmission permission message returned by the first access point, the sending unit is further configured to broadcast an acknowledgement message, so that after receiving the acknowledgement message, the other access points sequentially return transmission permission messages according to the sequence numbers.
With reference to the second aspect or with reference to the first or second or third or fourth possible implementation manner of the second aspect, in a fifth possible implementation manner, if the station and the associated first access point confirm that the channel is accessed through the first access point, and the receiving unit does not receive the transmission permission message returned by the other access point within a preset time, it is determined that the channel is busy, and data communication cannot be performed.
With reference to the fifth possible implementation manner of the second aspect, in a sixth possible implementation manner, after the receiving unit determines that a channel is busy and data communication cannot be performed, the sending unit is further configured to send an erasure message to the first access point, so that the first access point releases resources reserved for the station.
With reference to the second aspect or with reference to the first or second or third or fourth or fifth or sixth possible implementation manners of the second aspect, in a seventh possible implementation manner, the message allowing the access point to send back includes duration information that the other access point allows the station to occupy the channel.
A third aspect of embodiments of the present invention provides a computer program product, which may include a computer-readable medium including a set of program codes for performing a method according to the first aspect of embodiments or any implementation manner of the first aspect.
A fourth aspect of an embodiment of the present invention provides a system, which may include:
the station according to the second aspect of the embodiments or any implementation manner of the second aspect of the embodiments of the present invention; the first access point is associated with the station, when a request sending message of the station is received, a first transmission permission message is returned according to a sequence number distributed by the station, or the request sending message is sent to invite the station to access a channel, wherein the first transmission permission message is used for the first access point to permit the station to access the channel and indicating other stations in a working area of the first access point to set a network distribution vector of the first access point;
and the second access point is positioned in the working area of the site, and when the site and the first access point confirm that the channel is accessed through the first access point, a second permission sending message is returned according to the sequence number allocated by the site, wherein the second permission sending message is used for indicating the second access point and other sites positioned in the working area of the second access point to respectively set own network allocation vectors, and the network allocation vectors are used for configuring the silent time of the equipment.
The embodiment of the invention has the following beneficial effects:
after confirming that the station and the first access point access the channel through the first access point, the station does not immediately access the channel to perform data communication, and must receive a message which is returned by other access points and allows other access points in the station working area and stations under the access points to know the condition, and then access the channel to perform data communication, thereby avoiding communication interference and time conflict among all devices, reducing system power consumption and ensuring normal operation of communication. Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 view of a scenario of an OBSS system;
FIG. 2 is a flow chart illustrating a first embodiment of a data communication method according to the present invention;
FIG. 3 is a flow chart illustrating a data communication method according to a second embodiment of the present invention;
FIG. 4 is a flow chart illustrating a data communication method according to a third embodiment of the present invention;
FIG. 5 is a flow chart illustrating a data communication method according to a fourth embodiment of the present invention;
fig. 6 is a flowchart illustrating a fifth embodiment of the data communication method according to the present invention;
fig. 7 is a schematic composition diagram of a first embodiment of the station of the invention;
fig. 8 is a schematic composition diagram of a second embodiment of the station of the invention;
FIG. 9 is a schematic diagram of a system according to an embodiment of the present invention. Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying 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. 2, a flowchart of a data communication method according to a first embodiment of the present invention is shown, in which the method includes the following steps:
s201, the station sends the serial number to the access point in the station working area.
Wherein the sequence number is used to indicate an order in which each access point replies to the station.
Specifically, in the OBSS system, at least an associated first access point and an unassociated second access point exist in the working area of the station, and if the station broadcasts a message and does not assign a sequence number to each access point in advance, two or more access points may return an allowed transmission message at the same time, which may result in information collision and finally communication failure. Generally, the first access point may be assigned a sequence number 1 located at the head as an initial access point. Other access points may be assigned accordingly or randomly with reference to distance, interference, or other factors.
5202, when the station and the associated first access point confirm to access the channel through the first access point, receiving the transmission permission messages sequentially returned by other access points in the station working area according to the sequence number.
Specifically, the station may access a channel by actively initiating a request-to-send message, or passively receiving a request-to-send message sent by the first access point to perform channel access and data communication. However, whether the first access point is used for accessing the channel for data communication in an active or passive mode, in order to avoid useless power consumption and communication interference which may be generated in an OBSS system, the station must access the channel after receiving a transmission permission message returned by other access points, and at the moment, other access points and stations under each access point know that the station is accessing the channel for data communication, so that the station can keep silent in a period of time, thereby avoiding the increase of useless power consumption and reducing the interference to the station.
The message allowing the other access point to send back may include duration information that the other access point allows the station to occupy the channel.
The message returned by the other access points to allow transmission carries a Network Allocation Vector (NAV), and the Network Allocation Vector can configure the quiet time of the device by the NAV.
5203, the station accessing a channel through the first access point, in data communication with the first access point.
After the station receives the transmission permission message returned by the other access points, the station accesses the channel through the first access point, no other access point sends a message to the station, and no other station sends a message to the first access point, so that collision and interference in communication are avoided, and useless power consumption of the whole system is reduced.
In this embodiment, after confirming that the station accesses the channel through the first access point, the station does not immediately access the channel to perform data communication, and must also receive a transmission permission message returned by another access point, so that the station in the station working area and the stations under the access points all know the conditions, and then access the channel to perform data communication, thereby avoiding communication interference and time collision between each device, reducing system power consumption, and ensuring normal communication. It should be noted that, in the embodiment of the present invention, the existing RTS/CTS interaction may be used to determine the state of a station or an access point, and establish a path to implement data communication, and certainly, other information may also be used to perform the interaction, only the information sent by the station needs to be ensured to carry the address of the first access point, which is beneficial to other access points to return corresponding response messages when receiving the information and set the station itself and the station in the corresponding area to be silent.
Referring to fig. 3, a flowchart of a data communication method according to a second embodiment of the present invention is shown, in which the method includes the following steps:
s301, the station sends the sequence number to the access point in the station working area.
Wherein the sequence number is used to indicate an order in which each access point replies to the station.
S302, the station broadcasts a request sending message and requests the associated first access point to access the channel. Specifically, the station may actively broadcast the request-to-send message, and certainly the request-to-send message may be replaced by another reconfigured message, and only the message carries the address of the first access point, which is beneficial to the first access point and the other access points to respectively return response messages.
And S303, the station receives the first transmission permission message returned by the first access point according to the sequence number, and then receives the transmission permission messages sequentially returned by other access points in the station working area according to the sequence number.
Specifically, when the station actively broadcasts a request sending message and initiates an access request, the sequence number of the first access point is located at the first position, and the first access point firstly returns a first transmission permission message, so as to confirm that the station subsequently accesses the channel through the first access point. And then other access points return the allowed sending messages in turn according to the sequence numbers.
The other access points at least include a second access point, the first permission-to-send message is used for the first access point to allow the station to access the channel and instruct other stations in the working area of the first access point to set own network allocation vectors, the permission-to-send message returned by the second access point is a second permission-to-send message, the second permission-to-send message is used for instructing the second access point and other stations in the working area of the second access point to set own network allocation vectors respectively, and the network allocation vectors are used for configuring the time for equipment silence.
The first clear-to-send message and the clear-to-send messages returned by other access points may be replaced by other reconfigured messages, which may carry NAVs.
Preferably, the time for the other access points to return the permission message may be determined according to the sequence numbers corresponding to the respective access points. For example, the other access points may be waiting:
2*(N+l)*SIFS+CTS_t+N*CTS_t+2*(N+l)*PHY-delay
after the time of (c), a clear to send message is returned. Wherein, N is the serial number corresponding to the access point, N is greater than or equal to 0, SIFS is the short frame interval, 0^ 1 is the CTS response duration, and PHY _ delay is the physical layer transmission delay.
S304, the station accesses a channel through the first access point and carries out data communication with the first access point.
Referring to fig. 4, a flow chart of a third embodiment of the data communication method of the present invention is shown, in this embodiment, the method includes the following steps:
s401, the station sends the sequence number to the access point in the station working area.
Wherein the sequence number is used to indicate an order in which each access point replies to the station.
S402, the station receives the request sending message of the first access point, and broadcasts the permission sending message. Specifically, the station may also access the channel by passively receiving an invitation of the first access point. The process of confirming with the first access point can be completed only by broadcasting the transmission permission message when the request transmission message of the first access point is received.
It should be noted that the request sending message here may also be replaced by other reconfigured messages, and only the address information of the station needs to be carried; the message allowing transmission can also be replaced by other reconfigured messages, and only the address information and the NAV of the first access point need to be carried, so that when other access points receive messages which do not belong to the first access point, the messages are broadcasted and the NAV is set.
And S403, the station receives the message allowing to be sent, which is returned in sequence by other access points in the station working area according to the sequence number.
The other access points at least comprise a second access point, the transmission permission message returned by the second access point is a second transmission permission message, the second transmission permission message is used for indicating the second access point and other stations located in the working area of the second access point to respectively set own network allocation vectors, and the network allocation vectors are used for configuring the silent time of the equipment.
And when the other access points receive the messages which do not belong to the other access points, sequentially returning the transmission permission messages according to the sequence numbers, wherein the transmission permission messages carry NAVs, so that the other access points and the stations under the other access points keep silent in a period of time.
S404, the station accesses a channel through the first access point and carries out data communication with the first access point. Referring to fig. 5, a flowchart of a fourth embodiment of the data communication method of the present invention is shown, in which the method includes the following steps:
5501, the station sends the sequence number to the access point in the station working area.
5502, the station broadcasts a request-to-send message requesting access to a channel from the associated first access point. S503, the station receives a first message allowing to send returned by the first access point according to the sequence number.
5504, said station broadcasts a confirmation message so that said other access points return in turn the message allowing to send according to said sequence number after receiving said confirmation message.
After the station receives the first transmission permission message returned by the first access point, it may broadcast an acknowledgement message to notify other access points in the working area, the station has received the acknowledgement of the first access point, and the other access points may start to return transmission permission messages in sequence.
5505, the station receives the message allowing to send returned by other access points in the station working area according to the sequence number in turn.
5506, said station accesses a channel through said first access point, in data communication with said first access point.
In this embodiment, when the station receives the first transmission permission message of the first access point, the station broadcasts the acknowledgment message, so that the time for other access points to return the transmission permission message can be shortened, and the overall communication efficiency is improved.
Referring to fig. 6, a flowchart of a fifth embodiment of the data communication method according to the present invention is shown, in this embodiment, the method includes the following steps:
5601, the station sends a sequence number to an access point within the station's operating area.
5602, if the station and the associated first access point confirm that the channel is accessed through the first access point, and when the transmission permission message returned by the other access point is not received within the preset time, it is determined that the channel is busy, and data communication cannot be performed.
S603, the station sends a cancellation message to the first access point, so that the first access point releases the resource reserved for the station.
The resource here may be a channel resource or other resource reserved by the first access point for the station. When the station confirms that the communication cannot be carried out, the resource can be released as soon as possible by sending the cancellation message so as to be convenient for other stations to use, and therefore the utilization efficiency of system resources is improved. Referring to fig. 7, a schematic flow chart of a station according to a first embodiment of the present invention is shown, in this embodiment, the station includes:
a sending unit 100, configured to send a sequence number to an access point in the station working area, where the sequence number is used to indicate an order in which each access point replies to the station;
a receiving unit 200, configured to receive, when the station and the associated first access point confirm that the channel is accessed through the first access point, a message allowing transmission, which is returned in sequence by other access points in the station working area according to the sequence number;
an accessing unit 300, configured to access a channel through the first access point, and perform data communication with the first access point.
The sending unit 100 is specifically configured to broadcast a request sending message, and request an access channel from an associated first access point;
the receiving unit 200 is specifically configured to receive a first permission transmission message returned by the first access point according to the sequence number, and then receive permission transmission messages sequentially returned by other access points in the station working area according to the sequence number, where the other access points include at least a second access point, the first permission transmission message is used for the first access point to permit the station to access the channel and instruct other stations in the first access point working area to set their own network allocation vectors, and the allowed sending message returned by the second access point is a second allowed sending message, the second allowed sending message is used for indicating the second access point and other stations located in the working area of the second access point to respectively set own network allocation vectors, and the network allocation vectors are used for configuring the silent time of the equipment.
Or, the receiving unit 200 is specifically configured to receive a request sending message of the first access point; receiving the transmission permission messages returned by other access points in the station working area in sequence according to the sequence numbers, wherein the other access points at least comprise a second access point, the transmission permission messages returned by the second access point are second transmission permission messages, the second transmission permission messages are used for indicating the second access point and other stations in the second access point working area to set own network allocation vectors respectively, and the network allocation vectors are used for configuring equipment silence time;
the sending unit 100 is further configured to broadcast a transmission permission message after the receiving unit receives the transmission request message of the first access point.
After the receiving unit 200 receives the first transmission permission message returned by the first access point, the sending unit 100 is further configured to broadcast an acknowledgement message so that the other access points sequentially return the transmission permission messages according to the sequence number after receiving the acknowledgement message. If the station and the associated first access point confirm that the channel is accessed through the first access point, and the receiving unit 200 does not receive the transmission permission message returned by the other access points within the preset time, it is determined that the channel is busy, and data communication cannot be performed.
After the receiving unit 200 determines that the channel is busy and data communication cannot be performed, the sending unit 100 is further configured to send a cancellation message to the first access point, so that the first access point releases resources reserved for the station.
And the message which is returned by the other access points and allowed to be sent contains the duration information of the channel occupied by the other access points.
It should be noted that the above sending unit, receiving unit and access unit may exist independently or may be set integrally, and in the above station embodiment, the sending unit, receiving unit or access unit may be set independently in a form of hardware from a processor of the station, and the setting form may be a form of a microprocessor; the processor of the station may also be embedded in the processor of the station in a hardware form, or may also be stored in the memory of the station in a software form, so that the processor of the station calls and executes the operations corresponding to the sending unit, the receiving unit, or the access unit.
For example, in a first embodiment of the inventive station (the embodiment shown in fig. 7), the access unit
300 may be a processor of a station, and the functions of the sending unit 100 and the receiving unit 200 may be embedded in the processor, may be provided separately from the processor, or may be stored in a memory in the form of software called by the processor to implement the functions. Of course, the transmitting unit 100 and the receiving unit 200 may be integrally provided, may be independently provided, or may be provided independently or integrally as an interface circuit of a station. The embodiments of the invention are not limiting in any way. The processor can be a Central Processing Unit (CPU), a microprocessor, a singlechip and the like.
Referring to fig. 8, a schematic composition diagram of a station according to a second embodiment of the present invention is shown, in this embodiment, the station includes: an interface circuit 400, a memory 500, and a processor 600 coupled to the interface circuit 400 and the memory 500. Wherein the memory 500 is used for storing a set of program codes, and the processor 600 is used for calling the program codes stored in the memory 500 to execute the operations described in any of the first to fifth embodiments of the data communication method of the present invention.
Referring to fig. 9, a schematic composition diagram of a system according to an embodiment of the present invention is shown, in which the system includes:
a first access point 120, associated with the station 110, and configured to return a first transmission permission message according to a sequence number assigned by the station 110 or send a request transmission message to invite the station 110 to access a channel when receiving a request transmission message from the station 110, where the first transmission permission message is used for the first access point 120 to allow the station 110 to access the channel and instruct other stations in a working area of the first access point 120 to set a network allocation vector of the first access point;
and a second access point 130, located in the operating area of the station 110, and when the station 110 and the first access point 120 confirm that the channel is accessed through the first access point 120, returning a second permission transmission message according to the sequence number allocated by the station 110, where the second permission transmission message is used to instruct the second access point 130 and other stations located in the operating area of the second access point 130 to set their own network allocation vectors respectively, and the network allocation vectors are used to configure the time for device silence.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the apparatus embodiment, since it is substantially similar to the method embodiment, the comparative list will be described, and reference may be made to some descriptions of the method embodiment for relevant points.
Through the description of the above embodiments, the present invention has the following advantages:
after confirming that the station and the first access point access the channel through the first access point, the station does not immediately access the channel to perform data communication, and must receive a message which is returned by other access points and allows other access points in the station working area and stations under the access points to know the condition, and then access the channel to perform data communication, thereby avoiding communication interference and time conflict among all devices, reducing system power consumption and ensuring normal operation of communication.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks, etc.
The above description of the detailed embodiments of the data communication method, station and system provided by the embodiments of the present invention is only used to help understanding the method and its core idea of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (1)

  1. Claims to follow
    1. A method of data communication, comprising:
    the station sends a sequence number to access points in the station working area, wherein the sequence number is used for indicating the sequence of each access point for responding to the station;
    when the station and the associated first access point confirm to access the channel through the first access point, receiving the transmission permission messages sequentially returned by other access points in the station working area according to the sequence number;
    and the station accesses a channel through the first access point and carries out data communication with the first access point.
    2. The method according to claim 1, wherein the receiving the transmission permission messages sequentially returned by other access points in the station operating area according to the sequence numbers when the station and the associated first access point confirm to access the channel through the first access point comprises:
    the station broadcasts a request sending message and requests an associated first access point to access a channel; the station receives a first transmission permission message returned by the first access point according to the sequence number, and then receives transmission permission messages returned by other access points in the station working area in sequence according to the sequence number, the other access points at least comprise a second access point, the first transmission permission message is used for the first access point to permit the station to access the channel and instruct other stations in the first access point working area to set own network allocation vectors, and the message allowing transmission returned by the second access point is a second message allowing transmission, the second message allowing transmission is used for indicating the second access point and other stations located in the working area of the second access point to respectively set own network allocation vectors, and the network allocation vectors are used for configuring the silent time of the equipment. 3. The method according to claim 1, wherein the receiving the transmission permission messages sequentially returned by other access points in the station operating area according to the sequence numbers when the station and the associated first access point confirm to access the channel through the first access point comprises:
    the station receives a request sending message of the first access point and broadcasts a transmission permission message; and the station receives the transmission permission messages returned by other access points in the station working area in sequence according to the sequence numbers, the other access points at least comprise a second access point, the transmission permission messages returned by the second access point are second transmission permission messages, the second transmission permission messages are used for indicating the second access point and other stations in the second access point working area to respectively set own network allocation vectors, and the network allocation vectors are used for configuring the silent time of the equipment. 4. A method according to any one of claims 1 to 3, wherein the time at which the other access points return the grant message is determined in dependence on the respective sequence number of the respective access point.
    5. The method as claimed in claim 2, wherein after the station receives the first clear to send message returned by the first access point, further comprising:
    and the station broadcasts a confirmation message so that the other access points return the transmission permission messages in sequence according to the sequence number after receiving the confirmation message.
    6. The method according to any of claims 1-5, wherein if the station and the associated first access point confirm that the channel is accessed through the first access point, and when the message allowing transmission returned by the other access points is not received within a preset time, the station determines that the channel is busy and cannot perform data communication.
    7. The method of claim 6, wherein after the station determines that the channel is busy and data communication is not possible, further comprising:
    the station sends a cancellation message to the first access point so that the first access point releases resources reserved for the station.
    8. The method according to any of claims 1-7, wherein the message returned by the other access point to allow transmission includes duration information that the other access point allows the station to occupy the channel. 9. A station, comprising:
    a sending unit, configured to send a sequence number to an access point in the station working area, where the sequence number is used to indicate an order in which each access point replies to the station;
    a receiving unit, configured to receive, when the station and the associated first access point confirm that the channel is accessed through the first access point, a transmission permission message that is sequentially returned by other access points in the station working area according to the sequence number; and the access unit is used for accessing a channel through the first access point and carrying out data communication with the first access point.
    10. The station according to claim 9, wherein the sending unit is specifically configured to broadcast a request-to-send message requesting an access channel from the associated first access point;
    the receiving unit is specifically configured to receive a first permission transmission message returned by the first access point according to the sequence number, and then receive permission transmission messages sequentially returned by other access points in the station working area according to the sequence number, where the other access points include at least a second access point, the first permission transmission message is used for the first access point to permit the station to access the channel and instruct other stations in the first access point working area to set their own network allocation vectors, and the transmission permission message returned by the second access point is a second transmission permission message, the second transmission permission message is used for indicating that the second access point and other stations located in the working area of the second access point respectively set own network allocation vectors, and the network allocation vectors are used for configuring the silent time of the equipment. 11. The station according to claim 9, wherein the receiving unit is specifically configured to receive a request-to-send message of the first access point; receiving the transmission permission messages returned by other access points in the station working area in sequence according to the sequence numbers, wherein the other access points at least comprise a second access point, the transmission permission messages returned by the second access point are second transmission permission messages, the second transmission permission messages are used for indicating the second access point and other stations in the second access point working area to set own network allocation vectors respectively, and the network allocation vectors are used for configuring equipment silence time;
    the sending unit is further configured to broadcast a transmission permission message after the receiving unit receives the request transmission message of the first access point. 12. A station as claimed in any one of claims 9 to 11, characterised in that the time at which the other access points return the clear to send message is determined in dependence on the sequence number corresponding to each access point.
    13. The station of claim 10, wherein after the receiving unit receives the first clear to send message returned by the first access point, the sending unit is further configured to broadcast an acknowledgement message so that the other access points return clear to send messages in sequence according to the sequence number after receiving the acknowledgement message.
    14. A station according to any one of claims 9 to 13, wherein if the station and the associated first access point confirm that the channel is accessed through the first access point, and the receiving unit does not receive the transmission permission message returned by the other access points within a preset time, it determines that the channel is busy and data communication cannot be performed.
    15. The station of claim 14, wherein after the receiving unit determines that the channel is busy and data communication is not possible, the sending unit is further configured to send a cancellation message to the first access point so that the first access point releases resources reserved for the station.
    16. A station according to any one of claims 9 to 15, characterized in that the message returned by the other access point to allow transmission includes a long message that the other access point allows the station to occupy the channel
    17. A computer program product comprising a computer readable medium including a set of program codes for performing the method according to any one of claims 1-8.
    18. A system, comprising:
    the station of any one of claims 9-16;
    the first access point is associated with the station, when a request sending message of the station is received, a first transmission permission message is returned according to a sequence number distributed by the station, or the request sending message is sent to invite the station to access a channel, wherein the first transmission permission message is used for the first access point to permit the station to access the channel and indicating other stations in a working area of the first access point to set a network distribution vector of the first access point;
    and the second access point is positioned in the working area of the site, and when the site and the first access point confirm that the channel is accessed through the first access point, a second permission sending message is returned according to the sequence number allocated by the site, wherein the second permission sending message is used for indicating the second access point and other sites positioned in the working area of the second access point to respectively set own network allocation vectors, and the network allocation vectors are used for configuring the silent time of the equipment.
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Citations (3)

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CN102387535A (en) * 2010-09-03 2012-03-21 中兴通讯股份有限公司 Clear to send (CTS) reply method and system
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CN103250461A (en) * 2010-12-13 2013-08-14 思科技术公司 Medium reservation techniques for multi-ser transmissions

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Publication number Priority date Publication date Assignee Title
US20120257574A1 (en) * 2009-12-17 2012-10-11 Lg Electronics Inc. Method of reducing interference between stations in wireless lan system, and apparatus supporting the same
CN102387535A (en) * 2010-09-03 2012-03-21 中兴通讯股份有限公司 Clear to send (CTS) reply method and system
CN103250461A (en) * 2010-12-13 2013-08-14 思科技术公司 Medium reservation techniques for multi-ser transmissions

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