CN104507174A - Data transmission method and system for wireless access point and terminal - Google Patents
Data transmission method and system for wireless access point and terminal Download PDFInfo
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- CN104507174A CN104507174A CN201410771827.2A CN201410771827A CN104507174A CN 104507174 A CN104507174 A CN 104507174A CN 201410771827 A CN201410771827 A CN 201410771827A CN 104507174 A CN104507174 A CN 104507174A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000002452 interceptive effect Effects 0.000 claims description 16
- 238000004891 communication Methods 0.000 claims description 9
- 238000012790 confirmation Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
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- 230000007423 decrease Effects 0.000 description 12
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
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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
- H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
- H04L1/1678—Details of the supervisory signal the supervisory signal being transmitted together with control information where the control information is for timing, e.g. time stamps
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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Abstract
The invention provides a data transmission method and a system for a wireless access point and a terminal. The method comprises the following steps: waiting for an interframe spacing interval after a beacon frame is sent to the terminal; transmitting a request transmission frame to the terminal, wherein the request transmission frame comprises occupied moment of a channel; receiving a downlink allowing transmission frame returned by the terminal, wherein the terminal generates the download allowing transmission frame after receiving the request transmission frame; transmitting a download data frame to the terminal at the occupied moment of the channel, and receiving a download acknowledge character returned by the terminal, wherein the terminal generates the download acknowledge character after a short interframe spacing interval after receiving the download data frame at the occupied moment of the channel. The request transmission frame is transmitted through the terminal during data transmission, and comprises the occupied moment of the channel, thus the problem of throughput drop of the system under the multi-user circumstance can be solved.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to the data transmission method of a kind of wireless access points and terminal and the data transmission system of wireless access points and terminal.
Background technology
At present, WLAN (Wireless Local Area Networks, WLAN) the main access way of network and terminal room is DCF (Distributed Coordination Function, distributed coordination function) access, namely be carry out the application of communication channel based on competition mechanism and take, adopt distributed data mutual when carrying out the up-downgoing data interaction of wireless access points (AP, Wireless Access Point) and terminal.
Under a small amount of user, the distributed data interactive mode of DCF is a kind of higher mode for the utilization of channel.But when number of users rises, due to CSMA/CA (the Carrier Sense Multiple Accesswith Collision Avoidance adopted, Carrier Sense Multiple Access/conflict avoidance), cause a part of resource of system by the competition that consumes between multi-user and keep out of the way.So just cause the throughput in fact for transmitting to decline, and the more competitions of user are more obvious, thus the throughput degradation of reality is also more, even can drop to less than 1/3 of single user throughput.
As can be seen here, the distributed data of above-mentioned DCF, alternately due to the mechanism of CSMA/CA, makes the throughput of system when multi-user decline.
Summary of the invention
Based on this, be necessary, for the existing distributed data problem that throughput of system declines when multi-user alternately, to provide the data transmission method of a kind of wireless access points and terminal and the data transmission system of wireless access points and terminal.
A data transmission method for wireless access points and terminal, comprises the following steps:
After transmission beacon frame to terminal, wait for interframe space time, then send request and send a frame to described terminal; Wherein, what described request transmission frame comprised channel takies the moment;
Receive the descending permission transmission frame that described terminal returns; Wherein, described terminal produces described descending permission transmission frame after receiving described request transmission frame;
Downlink data frame is sent to described terminal in the moment that takies of described channel; Receive the descending acknowledge character that described terminal returns; Wherein, described terminal described channel take downlink data frame described in reception after, after too short interframe space time, produce described descending acknowledge character.
A data transmission system for wireless access points and terminal, comprising:
Sending module, for after transmission beacon frame to terminal, waits for interframe space time, then sends request and send a frame to described terminal; Wherein, what described request transmission frame comprised channel takies the moment;
Receiver module, for receiving the descending permission transmission frame that described terminal returns; Wherein, described terminal produces described descending permission transmission frame after receiving described request transmission frame;
Confirmation of receipt character module, sends downlink data frame for the moment that takies at described channel to described terminal; Receive the descending acknowledge character that described terminal returns; Wherein, described terminal described channel take downlink data frame described in reception after, after too short interframe space time, produce described descending acknowledge character.
Take the solution of the present invention, by sending request transmission frame to terminal during transmission data, what described request transmission frame comprised channel takies the moment; Thus make terminal take reception data according to described channel, each terminal sequentially carries out the reception of data, reduce the stand-by period because competition and castle increase, then decrease and consume competition and the system resource of keeping out of the way between multi-user, reach the problem that can solve throughput of system under multi-user and decline.
Accompanying drawing explanation
Fig. 1 is the flow chart of the data transmission method of wireless access points in an embodiment and terminal;
Fig. 2 is the flow chart of the data transmission method of wireless access points in another embodiment and terminal;
Fig. 3 is the data interaction flow chart of an embodiment wireless access points and terminal;
Fig. 4 is the structural representation of the data transmission system of wireless access points in an embodiment and terminal;
Fig. 5 is the structural representation of the data transmission system of wireless access points in another embodiment and terminal.
Embodiment
Below in conjunction with accompanying drawing, wireless access points of the present invention and the data transmission method of terminal and the embodiment of system are described in detail.
Refer to Fig. 1, Fig. 1 is the flow chart of the data transmission method of wireless access points in an embodiment and terminal.
A data transmission method for wireless access points and terminal, comprises the following steps:
Step S120: after transmission beacon frame to terminal, wait for interframe space time, then send request and send a frame to described terminal; Wherein, what described request transmission frame comprised channel takies the moment;
In the step s 120, interFrameGap can be centralized interFrameGap (PIFS, Point CoordinationFunction Interframe Space) or distributed inter-frame space (DIFS, Distributed CoordinationFunction Interframe Space); Send described beacon frame to represent and will carry out transfer of data to described terminal in the ensuing time, and the moment of transfer of data was determined by the moment that takies of described channel; Thus make terminal take reception data according to described channel, each terminal sequentially carries out the reception of data, reduce the stand-by period because competition and castle increase, then decrease and consume competition and the system resource of keeping out of the way between multi-user, reach the effect that can solve the problem that throughput of system under multi-user declines.
In one embodiment, the wireless access points of the present embodiment and the data transmission method of terminal can also comprise:
Before transmission beacon frame to terminal, judge whether access customer number reaches the threshold value of setting;
If so, beacon frame is sent to terminal; If not, distributed data interactive mode and terminal is adopted to carry out transfer of data.
When access customer number does not reach the threshold value of setting, adopt distributed data interactive mode and terminal to carry out transfer of data higher for the utilization of channel, the throughput of system is also higher; And when number of users reaches the threshold value of setting, cancel distributed data interactive mode, and send described beacon frame to described terminal, carry out the subsequent step to terminal data transmission; Thus can reach no matter access customer number is many or few, the effect of higher throughput of system can be kept.
In one embodiment, the wireless access points of the present embodiment and the data transmission method of terminal can also comprise:
Before transmission beacon frame to terminal, by the terminal that wireless exploration is online;
Set up and carry out communication association with online terminal.
By terminal online described in wireless exploration, when making to associate described terminal, not online terminal can be got rid of, thus improve the efficiency of the described terminal of association.
In one embodiment, described interFrameGap can be centralized interFrameGap.
After transmission beacon frame to terminal, centralized interFrameGap is shorter than distributed inter-frame space, is conducive to shortening the time of terminal being carried out to transfer of data, thus can improves the throughput of system.
Step S140: receive the descending permission transmission frame that described terminal returns; Wherein, described terminal produces described descending permission transmission frame after receiving described request transmission frame;
In step S140, described terminal, after receiving described request transmission frame (RTS, Request To Send), is apprised of and will be taken reception data at channel, described descending CTS (Clear TO Send allows transmission frame) is returned while preparing to receive data.The effect of described descending permission transmission frame informs that wireless access points can transmit data.
Step S160: send downlink data frame to described terminal in the moment that takies of described channel; Receive the descending acknowledge character that described terminal returns; Wherein, described terminal described channel take downlink data frame described in reception after, after too short interframe space time, produce described descending acknowledge character.
In step S160, the effect of described descending acknowledge character represents that described terminal has received described downlink data frame; Short interFrameGap is shorter than other interFrameGaps, is conducive to shortening the time that described terminal returns described descending acknowledge character, thus improves the throughput of system.
The wireless access points of the present embodiment and the data transmission method of terminal, described channel take to described terminal, the moment sends that downlink data frame makes described terminal according to described channel take reception data, each terminal sequentially carries out the reception of data, reduce the stand-by period because competition and castle increase, then can reduce and consume competition and the system resource of keeping out of the way between multi-user, the problem that throughput of system under multi-user declines can be solved.
Refer to Fig. 2, Fig. 2 is the flow chart of the data transmission method of wireless access points in another embodiment and terminal.
A data transmission method for wireless access points and terminal, comprises the following steps:
Step S210: after transmission beacon frame to terminal, wait for interframe space time, then send request and send a frame to described terminal; Wherein, what described request transmission frame comprised channel takies the moment;
In step S210, interFrameGap can be centralized interFrameGap or distributed inter-frame space; Send described beacon frame to represent and will carry out transfer of data to described terminal in the ensuing time, and the moment of transfer of data was determined by the moment that takies of described channel; Thus make terminal take reception data according to described channel, each terminal sequentially carries out the reception of data, reduce the stand-by period because competition and castle increase, then decrease and consume competition and the system resource of keeping out of the way between multi-user, reach the effect that can solve the problem that throughput of system under multi-user declines.
In one embodiment, the wireless access points of the present embodiment and the data transmission method of terminal can also comprise:
Before transmission beacon frame to terminal, judge whether access customer number reaches the threshold value of setting;
If so, beacon frame is sent to terminal; If not, distributed data interactive mode and terminal is adopted to carry out transfer of data.
When access customer number does not reach the threshold value of setting, adopt distributed data interactive mode and terminal to carry out transfer of data higher for the utilization of channel, the throughput of system is also higher; And when number of users reaches the threshold value of setting, cancel distributed data interactive mode, and send described beacon frame to described terminal, carry out the subsequent step to terminal data transmission; Thus can reach no matter access customer number is many or few, the effect of higher throughput of system can be kept.
In one embodiment, the wireless access points of the present embodiment and the data transmission method of terminal can also comprise:
Before transmission beacon frame to terminal, by the terminal that wireless exploration is online;
Set up and carry out communication association with online terminal.
By terminal online described in wireless exploration, when making to associate described terminal, not online terminal can be got rid of, thus improve the efficiency of the described terminal of association.
In one embodiment, described interFrameGap can be centralized interFrameGap.
After transmission beacon frame to terminal, centralized interFrameGap is shorter than distributed inter-frame space, is conducive to shortening the time of terminal being carried out to transfer of data, thus can improves the throughput of system.
Step S220: receive the descending permission transmission frame that described terminal returns; Wherein, described terminal produces described descending permission transmission frame after receiving described request transmission frame;
In step S220, described terminal, after receiving described request transmission frame, is apprised of and will be taken reception data at channel, returns described descending permission transmission frame while preparing to receive data.The effect of described descending permission transmission frame informs that wireless access points can transmit data.
Step S230: send downlink data frame to described terminal in the moment that takies of described channel; Receive the descending acknowledge character that described terminal returns; Wherein, described terminal described channel take downlink data frame described in reception after, after too short interframe space time, produce described descending acknowledge character;
In step S230, the effect of described descending acknowledge character represents that described terminal has received described downlink data frame; Short interFrameGap is shorter than other interFrameGaps, is conducive to shortening the time that described terminal returns described descending acknowledge character, thus improves the throughput of system.
S240: after the descending acknowledge character that the described terminal of reception returns, through described interframe space time, send up permission transmission frame to described terminal; Wherein, described up permission transmission frame comprises: the time span of the address information of described terminal and the busy channel of setting;
In step S240, described interFrameGap can be centralized interFrameGap or distributed inter-frame space, described up permission transmission frame comprises: the time span of the address information of described terminal and the busy channel of setting, represent that the terminal corresponding with the address information of described terminal can carry out transfer of data in the time span of the busy channel set, thus make each terminal sequentially and carry out transfer of data in the time span of the busy channel of setting, and then the stand-by period can reduced because competition and castle increase, decrease the system resource that consumption is competed and kept out of the way between multi-user, reach the effect of the problem of the throughput degradation solving the system when multi-user.
In one embodiment, described interFrameGap can be centralized interFrameGap.
After the descending acknowledge character that the described terminal of reception returns, centralized interFrameGap is shorter than distributed inter-frame space, is conducive to shortening the time to terminal data transmission, thus improves the throughput of system.
In one embodiment, before sending up permission transmission frame to described terminal, can also comprise:
Obtain the historical time length of described terminal transmission data, the time span of busy channel according to described historical time length computation.
Historical time length with described terminal transmission data is added up, mean value formula can be utilized to calculate time span average, formula of variance can be utilized to calculate time span variance, for the terminal that time span variance is larger, the basis of time span average significantly can adjust according to the historical time length of statistics, for the terminal that time span variance is less, trickle adjustment can be carried out on the basis of time span average.
S250: receive according to the address information of described terminal the uplink data frames that described terminal returns in the time span of busy channel; Wherein, described terminal generates described uplink data frames after receiving described up permission transmission frame;
The terminal corresponding with the address information of described terminal can return uplink data frames after receiving described up permission transmission frame, carries out transfer of data.
S260: feeding back uplink acknowledge character is to described terminal after receiving described uplink data frames.
The effect of described up acknowledge character informs that described terminal has received described uplink data frames.
The wireless access points of the present embodiment and the data transmission method of terminal, during downlink data transmission, described channel take to described terminal, the moment sends that downlink data frame makes described terminal according to described channel take reception data, each terminal sequentially carries out the reception of data; During transmitting uplink data, by the time span of the address information of described terminal and the busy channel of setting, the terminal corresponding with the address information of described terminal can carry out transfer of data in the time span of the busy channel set, and makes each terminal sequentially and carry out transfer of data in the time span of the busy channel of setting; Thus the stand-by period reduced because competition and castle increase, then can reduce and consume competition and the system resource of keeping out of the way between multi-user, the problem of throughput of system decline under multi-user can be solved.
In order to further explain the data transmission method of wireless access points of the present invention and terminal in detail, be described below in conjunction with embody rule example.
This embody rule example adopts wireless access points and terminal to carry out data interaction.
Please refer to Fig. 3, Fig. 3 is the data interaction flow chart of an embodiment wireless access points and terminal.
First judge whether access customer number reaches the threshold value of setting, if access customer number does not reach the threshold value of setting, then adopt the distributed data interactive mode based on CSMA/CA to carry out transfer of data.If access customer number reaches the threshold value of setting, wireless access points associates online terminal by the online terminal of wireless exploration Serial Communication of going forward side by side.Then send beacon frame to channel at wireless access points, after all terminals receive, wait for the PIFS time, up-downgoing data interaction is carried out to terminal 1.Terminal 1 can be determined by priority mechanism also can by described wireless access points random selecting in all associated terminals.
When carrying out downlink data transmission, described wireless access points sends request and sends a frame to described terminal 1; Wherein, what described request transmission frame comprised channel takies the moment; Descending permission transmission frame is sent to described wireless access points after terminal 1 receives described request transmission frame.Then described wireless access points sends downlink data frame in the moment that takies of described channel to terminal 1.Described terminal 1 after receiving described downlink data frame, through the SIFS time, to described wireless access points feeding back downlink acknowledge character.
When carrying out transmitting uplink data, described wireless access points, through the PIFS time, sends up permission transmission frame to described terminal 1; Wherein, described up permission transmission frame comprises: the time span of the described address information of terminal 1 and the busy channel of setting; In the time span of described busy channel, the terminal corresponding with the address information of described terminal 1 and terminal 1 send uplink data frames to described wireless access points; Described wireless access points receives after described uplink data frames to terminal 1 feeding back uplink acknowledge character.
After the up-downgoing data interaction of complete paired terminal 1, carrying out up-downgoing data interaction to terminal 2, is then terminal 3, terminal 4 ... terminal n, until all users complete up-downgoing data interaction.
Refer to Fig. 4, Fig. 4 is the structural representation of the data transmission system of wireless access points in an embodiment and terminal.
A data transmission system for wireless access points and terminal, comprising:
Sending module 320, for after transmission beacon frame to terminal, waits for interframe space time, then sends request and send a frame to described terminal; Wherein, what described request transmission frame comprised channel takies the moment;
InterFrameGap can be centralized interFrameGap or distributed inter-frame space; Send described beacon frame to represent and will carry out transfer of data to described terminal in the ensuing time, and the moment of transfer of data was determined by the moment that takies of described channel; Thus make terminal take reception data according to described channel, each terminal sequentially carries out the reception of data, reduce the stand-by period because competition and castle increase, then decrease and consume competition and the system resource of keeping out of the way between multi-user, the problem that throughput of system under multi-user declines can be solved.
In one embodiment, the wireless access points of described the present embodiment and the data transmission system of terminal can also comprise:
Judge module, for before transmission beacon frame to terminal, judges whether access customer number reaches the threshold value of setting;
If so, beacon frame is sent to terminal; If not, distributed data interactive mode and terminal is adopted to carry out transfer of data.
When access customer number does not reach the threshold value of setting, adopt distributed data interactive mode and terminal to carry out transfer of data higher for the utilization of channel, the throughput of system is also higher; And when number of users reaches the threshold value of setting, cancel distributed data interactive mode, and send described beacon frame to described terminal, carry out the subsequent step to terminal data transmission; Thus can reach no matter access customer number is many or few, the effect of higher throughput of system can be kept.
In one embodiment, the wireless access points of the present embodiment and the data transmission system of terminal can also comprise:
Detection relating module, for before transmission beacon frame to terminal, by the terminal that wireless exploration is online;
Set up and carry out communication association with online terminal.
By terminal online described in wireless exploration, not online terminal can be got rid of when making to associate described terminal, thus the efficiency associating described terminal can be improved.
In one embodiment, described interFrameGap can be centralized interFrameGap.
After transmission beacon frame to terminal, centralized interFrameGap is shorter than distributed inter-frame space, is conducive to shortening the time of terminal being carried out to transfer of data, thus improves the throughput of system.
Receiver module 340, for receiving the descending permission transmission frame that described terminal returns; Wherein, described terminal produces described descending permission transmission frame after receiving described request transmission frame;
Described terminal, after receiving described request transmission frame, is apprised of and will be taken reception data at channel, returns described descending CTS while preparing to receive data.The effect of described descending permission transmission frame informs that wireless access points can transmit data.
Confirmation of receipt character module 360, sends downlink data frame for the moment that takies at described channel to described terminal; Receive the descending acknowledge character that described terminal returns; Wherein, described terminal described channel take downlink data frame described in reception after, after too short interframe space time, produce described descending acknowledge character.
Described descending acknowledge character represents that described terminal has received described downlink data frame; Short interFrameGap is shorter than other interFrameGaps, is conducive to shortening the time that described terminal returns described descending acknowledge character, thus improves the throughput of system.
The wireless access points of the present embodiment and the data transmission system of terminal, described channel take to described terminal, the moment sends that downlink data frame makes described terminal according to described channel take reception data, each terminal sequentially carries out the reception of data, reduce the stand-by period because competition and castle increase, then can reduce and consume competition and the system resource of keeping out of the way between multi-user, the problem that throughput of system under multi-user declines can be solved.
Refer to Fig. 5, Fig. 5 is the structural representation of the data transmission system of wireless access points in another embodiment and terminal.
A data transmission system for wireless access points and terminal, comprising:
Sending module 410, for after transmission beacon frame to terminal, waits for interframe space time, then sends request and send a frame to described terminal; Wherein, what described request transmission frame comprised channel takies the moment;
InterFrameGap can be centralized interFrameGap or distributed inter-frame space; Send described beacon frame to represent and will carry out transfer of data to described terminal in the ensuing time, and the moment of transfer of data was determined by the moment that takies of described channel; Thus make terminal take reception data according to described channel, each terminal sequentially carries out the reception of data, reduce the stand-by period because competition and castle increase, then decrease and consume competition and the system resource of keeping out of the way between multi-user, the problem that throughput of system under multi-user declines can be solved.
In one embodiment, the wireless access points of the present embodiment and the data transmission system of terminal can also comprise:
Judge module, for before transmission beacon frame to terminal, judges whether access customer number reaches the threshold value of setting;
If so, beacon frame is sent to terminal; If not, distributed data interactive mode and terminal is adopted to carry out transfer of data.
When access customer number does not reach the threshold value of setting, adopt distributed data interactive mode and terminal to carry out transfer of data higher for the utilization of channel, the throughput of system is also higher; And when number of users reaches the threshold value of setting, cancel distributed data interactive mode, and send described beacon frame to described terminal, carry out the subsequent step to terminal data transmission; Thus can reach no matter access customer number is many or few, the effect of higher throughput of system can be kept.
In one embodiment, the wireless access points of the present embodiment and the data transmission system of terminal can also comprise:
Detection relating module, for before transmission beacon frame to terminal, by the terminal that wireless exploration is online;
Set up and carry out communication association with online terminal.
By terminal online described in wireless exploration, not online terminal can be got rid of when making to associate described terminal, thus the efficiency associating described terminal can be improved.
In one embodiment, described interFrameGap can be centralized interFrameGap.
After transmission beacon frame to terminal, centralized interFrameGap is shorter than distributed inter-frame space, is conducive to shortening the time of terminal being carried out to transfer of data, thus improves the throughput of system.
Receiver module 420, for receiving the descending permission transmission frame that described terminal returns; Wherein, described terminal produces described descending permission transmission frame after receiving described request transmission frame;
Described terminal, after receiving described request transmission frame, is apprised of and will be taken reception data at channel, returns described descending permission transmission frame while preparing to receive data.The effect of described descending permission transmission frame informs that wireless access points can transmit data.
Confirmation of receipt character module 430, sends downlink data frame for the moment that takies at described channel to described terminal; Receive the descending acknowledge character that described terminal returns; Wherein, described terminal described channel take downlink data frame described in reception after, after too short interframe space time, produce described descending acknowledge character;
Described descending acknowledge character represents that described terminal has received described downlink data frame; Short interFrameGap is shorter than other interFrameGaps, is conducive to shortening the time that described terminal returns described descending acknowledge character, thus improves the throughput of system.
Send up permission transmission frame module 440, for after receiving the descending acknowledge character that returns of described terminal, through described interframe space time, send up permission transmission frame to described terminal; Wherein, described up permission transmission frame comprises: the time span of the address information of described terminal and the busy channel of setting;
Described interFrameGap can be centralized interFrameGap or distributed inter-frame space, described up permission transmission frame comprises: the time span of the address information of described terminal and the busy channel of setting represents, the terminal corresponding with the address information of described terminal can carry out transfer of data in the time span of the busy channel set, thus make each terminal sequentially and carry out transfer of data in the time span of the busy channel of setting, and then the stand-by period can reduced because competition and castle increase, decrease the system resource that consumption is competed and kept out of the way between multi-user, reach the effect of the throughput degradation problem of the system when multi-user that solves.
In one embodiment, described interFrameGap can be centralized interFrameGap.
After the descending acknowledge character that the described terminal of reception returns, centralized interFrameGap is shorter than distributed inter-frame space, is conducive to shortening the time to terminal data transmission, thus improves the throughput of system.
In one embodiment, described transmission up permission transmission frame module can also comprise:
Computing module, for obtaining the historical time length of described terminal transmission data, the time span of busy channel according to described historical time length computation.
Historical time length with described terminal transmission data is added up, mean value formula can be utilized to calculate time span average, formula of variance can be utilized to calculate time span variance, for the terminal that time span variance is larger, significantly can adjust according to the historical time length of statistics on the basis of time span average, for the terminal that time span variance is less, trickle adjustment can be carried out on the basis of time span average.
Return module 450, for receiving according to the address information of described terminal the uplink data frames that described terminal returns in the time span of busy channel; Wherein, described terminal generates described uplink data frames after receiving described up permission transmission frame;
The terminal corresponding with the address information of described terminal can return uplink data frames after receiving described up permission transmission frame, carries out transfer of data.
Feedback module 460, for feeding back uplink acknowledge character after receiving described uplink data frames to described terminal.
The effect of described up acknowledge character informs that described terminal has received described uplink data frames.
The wireless access points of the present embodiment and the data transmission system of terminal, during downlink data transmission, described channel take to described terminal, the moment sends that downlink data frame makes described terminal according to described channel take reception data, each terminal sequentially carries out the reception of data; During transmitting uplink data, by the time span of the address information of described terminal and the busy channel of setting, the terminal corresponding with the address information of described terminal can carry out transfer of data in the time span of the busy channel set, and makes each terminal sequentially and carry out transfer of data in the time span of the busy channel of setting; Thus the stand-by period reduced because competition and castle increase, then can reduce and consume competition and the system resource of keeping out of the way between multi-user, the problem of throughput of system decline under multi-user can be solved.
It is to be understood that, in the data transmission method and system of wireless access points of the present invention and terminal, be not limited to the technical scheme set forth in above preferred embodiment, also can adopt the technical scheme of other form, the effect solving the throughput degradation problem of system when multi-user can be realized.
The data transmission system of wireless access points of the present invention and terminal and the data transmission method one_to_one corresponding of wireless access points of the present invention and terminal, the technical characteristic of setting forth in the embodiment of the data transmission method of above-mentioned wireless access points and terminal and beneficial effect thereof are all applicable to, in the embodiment of the data transmission system of wireless access points and terminal, hereby state.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (12)
1. a data transmission method for wireless access points and terminal, is characterized in that, comprises the following steps:
After transmission beacon frame to terminal, wait for interframe space time, then send request and send a frame to described terminal; Wherein, what described request transmission frame comprised channel takies the moment;
Receive the descending permission transmission frame that described terminal returns; Wherein, described terminal produces described descending permission transmission frame after receiving described request transmission frame;
Downlink data frame is sent to described terminal in the moment that takies of described channel; Receive the descending acknowledge character that described terminal returns; Wherein, described terminal described channel take downlink data frame described in reception after, after too short interframe space time, produce described descending acknowledge character.
2. the data transmission method of wireless access points according to claim 1 and terminal, is characterized in that, also comprises:
After the descending acknowledge character that the described terminal of reception returns, through described interframe space time, send up permission transmission frame to described terminal; Wherein, described up permission transmission frame comprises: the time span of the address information of described terminal and the busy channel of setting;
Receive according to the address information of described terminal the uplink data frames that described terminal returns in the time span of busy channel; Wherein, described terminal generates described uplink data frames after receiving described up permission transmission frame;
After receiving described uplink data frames, feeding back uplink acknowledge character is to described terminal.
3. the data transmission method of wireless access points according to claim 1 and 2 and terminal, is characterized in that, also comprises:
Before transmission beacon frame to terminal, judge whether access customer number reaches the threshold value of setting;
If so, beacon frame is sent to terminal; If not, distributed data interactive mode and terminal is adopted to carry out transfer of data.
4. the data transmission method of wireless access points according to claim 1 and 2 and terminal, is characterized in that, also comprises:
Before transmission beacon frame to terminal, by the terminal that wireless exploration is online;
Set up and carry out communication association with online terminal.
5. the data transmission method of wireless access points according to claim 1 and 2 and terminal, is characterized in that, described interFrameGap is centralized interFrameGap.
6. the data transmission method of wireless access points according to claim 2 and terminal, is characterized in that, before sending up permission transmission frame to described terminal, also comprises:
Obtain the historical time length of described terminal transmission data, the time span of busy channel according to described historical time length computation.
7. a data transmission system for wireless access points and terminal, is characterized in that, comprising:
Sending module, for after transmission beacon frame to terminal, waits for interframe space time, then sends request and send a frame to described terminal; Wherein, what described request transmission frame comprised channel takies the moment;
Receiver module, for receiving the descending permission transmission frame that described terminal returns; Wherein, described terminal produces described descending permission transmission frame after receiving described request transmission frame;
Confirmation of receipt character module, sends downlink data frame for the moment that takies at described channel to described terminal; Receive the descending acknowledge character that described terminal returns; Wherein, described terminal described channel take downlink data frame described in reception after, after too short interframe space time, produce described descending acknowledge character.
8. the data transmission system of wireless access points according to claim 7 and terminal, is characterized in that, also comprises after described confirmation of receipt character module:
Send up permission transmission frame module, for after receiving the descending acknowledge character that returns of described terminal, through described interframe space time, send up permission transmission frame to described terminal; Wherein, described up permission transmission frame comprises: the time span of the address information of described terminal and the busy channel of setting;
Return module, for receiving according to the address information of described terminal the uplink data frames that described terminal returns in the time span of busy channel; Wherein, described terminal generates described uplink data frames after receiving described up permission transmission frame;
Feedback module, for feeding back uplink acknowledge character after receiving described uplink data frames to described terminal.
9. the wireless access points according to claim 7 or 8 and the data transmission system of terminal, is characterized in that, also comprise:
Judge module, for before transmission beacon frame to terminal, judges whether access customer number reaches the threshold value of setting;
If so, beacon frame is sent to terminal; If not, distributed data interactive mode and terminal is adopted to carry out transfer of data.
10. the wireless access points according to claim 7 or 8 and the data transmission system of terminal, is characterized in that, also comprise:
Detection relating module, for before transmission beacon frame to terminal, by the terminal that wireless exploration is online;
Set up and carry out communication association with online terminal.
The data transmission system of 11. wireless access points according to claim 7 or 8 and terminal, it is characterized in that, described interFrameGap is centralized interFrameGap.
The data transmission system of 12. wireless access points according to claim 8 and terminal, is characterized in that, described transmission up permission transmission frame module also comprises:
Computing module, for obtaining the historical time length of described terminal transmission data, the time span of busy channel according to described historical time length computation.
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| CN104507174B (en) | 2018-05-18 |
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Address after: 510663 No. 10 Shenzhou Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee after: Jingxin Network System Co.,Ltd. Address before: 510663 No. 10 Shenzhou Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee before: COMBA TELECOM SYSTEMS (CHINA) Ltd. |
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