CN103687044B - A kind of data transmission method and equipment - Google Patents
A kind of data transmission method and equipment Download PDFInfo
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- CN103687044B CN103687044B CN201210318738.3A CN201210318738A CN103687044B CN 103687044 B CN103687044 B CN 103687044B CN 201210318738 A CN201210318738 A CN 201210318738A CN 103687044 B CN103687044 B CN 103687044B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a kind of data transmission method and equipment, are related to wireless local area network technology, wherein the method includes：In WLAN WLAN, access point AP is that each site STA dynamic allocation are used for transmission the ascending time slot and/or descending time slot of data, and the gap information is sent to corresponding STA according to data transfer demands；For ascending time slot, AP distributes to the ascending time slot of STA at it and receives the uplink data frames from corresponding STA；For descending time slot, AP distributes to the descending time slot of STA at it and sends downlink data frame to corresponding STA.The present invention realizes uplink and downlink scheduling, solves the problems, such as user's collision and recessive node, ensure that data transmission efficiency, reduce the interference between power consumption and user.
Description
Technical field
The present invention relates to WLAN WLAN technologies, more particularly to the method and apparatus of data transmission in a kind of WLAN.
Background technology
With being widely used derived from 802.11 standard WLAN, in terms of networking covering, also from original simple office or
Family lan, the relatively small number of scene of user develop into large-scale carrier class operation, application scenarios at present and also gradually spread
For users compact districts such as conference and exhibition center, stadiums, transport hub and airport colleges and universities.In face of extensive group of carrier class operation
Net demand, original 802.11 technology is constantly updated there is also one and the process of optimization.
Specific carrier sense and multiple access/collision avoidance technique are used in 802.11MAC（CSMA/CA）Mechanism is claimed
For distributed coordination function（DCF）, a kind of channel access function distributed, competition-based of DCF offers.Website is without concentrating
The coordinator or moderator of formula, but channel access is obtained by competition.This highly effective rate of mechanism, and in active stations
It is liberally assigned with bandwidth between point.But under the scale of carrier class operation, due to increasing for number of users, inevitably have
Transmission leads to the generation of collision while multiple user data, to bring substantially reducing for efficiency of transmission.Additionally, due to presence
Sightless concealed nodes between user, the similarly generation of user data transmission collision caused by meeting.
802.11 standards have been further introduced into point coordination function on the basis of DCF（PCF）, it is located at AP when using PCF
In point coordinator establish the uncontended periods of a cycle（CFP）, to the uncontested of wireless medium in uncontended periods
Access is by a coordinator coordinates.During CFP, the transmission of data is carried out by the way of poll.The limitation of PCF mechanism is have
The communication of PCF and DCF all may be caused to postpone；The scheme to all user's polls is used in the CFP periods simultaneously, can cause to pass
The problem of defeated efficiency reduces.
The wireless Mesh netword of WLAN is a kind of and the entirely different network of traditional wireless network.Traditional wireless access
In technology, point-to-point or point-to-multipoint topological structure are mainly used.A center is usually present in this topological structure
Node, the access point (AP) in 802.11 WLANs (WLAN).Centroid is wireless by single-hop with each wireless terminal
Link is connected, and controls access of each wireless terminal to wireless network；Meanwhile being connected with wired backbone further through wire link,
The connection of backbone network is provided.And in wireless Mesh netword, it is a kind of how point-to-multipoint net using netted Mesh topological structures
Network topological structure.In this Mesh network structure, each network node is by other adjacent network nodes, in a manner of wireless multi-hop
It is connected.Mesh media access coordination function component (MMACFC) and are responsible for effective contention access and the transmission of multi-hop internodal data packet
The scheduling of reception.Mesh nodes are needed with other Mesh nodes coordinatings to solve the problems, such as competition and shared wireless medium, to protect
Demonstrate,prove effective forwarding that the data packet of the point itself and other nodes passes through multi-hop.It intuitively sees, MMACFC can be worked effectively in
In multi-hop Mesh network.But MMACFC equally exists problem to be solved：Hidden terminal problem, on multi-hop transmission path
The effectively scheduling etc. of scheduling, the work access of Mesh inter-nodal channels.
Invention content
The purpose of the present invention is to provide a kind of data transmission method and equipment, realize uplink and downlink scheduling, and ensureing to pass
While defeated efficiency, solves the problems, such as user's collision and concealed nodes, the interference between power consumption and user can be reduced.
According to an aspect of the present invention, a kind of data transmission method provided includes：
In WLAN WLAN, access point AP is that each site STA is dynamically distributed for passing according to data transfer demands
The ascending time slot and/or descending time slot of transmission of data, and the gap information is sent to corresponding STA；
For ascending time slot, AP distributes to the ascending time slot of STA at it and receives the uplink data frames from corresponding STA；
For descending time slot, AP distributes to the descending time slot of STA at it and sends downlink data frame to corresponding STA.
Preferably, by sending beacon frame to STA, the ascending time slot and/or descending time slot information are sent to phase by AP
The STA answered.
Preferably, AP receives the uplink data frames and is demodulated in the data transmission period of ascending time slot, on described
When the demodulation of row data frame is correct, the STA data transfer demands information therein for the distribution of time slot next time is obtained, and described
In the feedback transmission time of ascending time slot upstream data ACK frames are sent to STA.
Preferably, when the uplink data frames demodulate mistake, AP determines STA, and there are STA data transfer demands.
Preferably, AP sends downlink data frame in the data transmission period of descending time slot to corresponding STA, and under described
The downlink data ACK frames that the STA is responded are received in the feedback transmission time of row time slot and are demodulated, and are obtained therein for next
The STA data transfer demands information of secondary time slot distribution.
Preferably, further include：
The association request that AP is initiated according to STA distributes STA user index information for STA, and will carry the STA user
The association response frame of index information is sent to STA, will pass through STA user index information association AP and corresponding STA.
According to another aspect of the present invention, a kind of data transmission set provided includes：
Time slot allocating unit, for being each site STA dynamic point according to data transfer demands in WLAN WLAN
It is used in the ascending time slot and/or descending time slot of transmission data；
Data receipt unit, the ascending time slot for distributing to STA at it receive the uplink data frames from corresponding STA；
Data transmission unit, for the ascending time slot and/or descending time slot information to be sent to corresponding STA, and
It is distributed to the descending time slot of STA and sends downlink data frame to corresponding STA.
Preferably, the data transmission unit to STA by sending beacon frame, when by the ascending time slot and/or downlink
Gap information is sent to corresponding STA.
Preferably, further include：
Transmission demand acquiring unit, for obtaining STA data transfer demands information or acquisition in the uplink data frames
STA respond the downlink data frame and the downlink data ACK frames responded in STA data transfer demands information, to carry out down
Time slot distribution.
Preferably, further include：
Allocation unit is indexed, the association request for being initiated according to STA distributes STA user index information for STA user,
And the association response frame for carrying the STA user indexes information is sent to by STA by data transmission unit, will pass through STA
User index information association AP and corresponding STA.
Compared with prior art, the beneficial effects of the present invention are：
1, flexible uplink and downlink scheduled transmission may be implemented in the present invention, and data transmission is avoided to occur colliding and performance being caused to be disliked
The problem of influence of change and concealed nodes；
2, the present invention uses fixed transmission time slot, user only to need to carry out data biography in AP for the time slot of its dynamic allocation
Defeated, opposite contention access mechanism greatly reduces the interference between the power consumption and user of system；
3, the present invention can effectively improve the efficiency of Mesh systems applied in the Mesh network of WLAN.
Description of the drawings
Fig. 1 is data transmission method flow chart provided in an embodiment of the present invention；
Fig. 2 is Beacon frames sending cycle schematic diagram provided in an embodiment of the present invention；
Fig. 3 is the time slot relations of distribution figure in data transmission time period provided in an embodiment of the present invention；
Fig. 4 is user's transmission time slot allocation field schematic diagram provided in an embodiment of the present invention；
Fig. 5 is the ends AP provided in an embodiment of the present invention process chart；
Fig. 6 is the ends STA provided in an embodiment of the present invention process chart；
Fig. 7 is first example of user's transmission time slot allocation field provided in an embodiment of the present invention；
Fig. 8 is second example of user's transmission time slot allocation field provided in an embodiment of the present invention；
Fig. 9 is data transmission set block diagram provided in an embodiment of the present invention.
Specific implementation mode
Below in conjunction with attached drawing to a preferred embodiment of the present invention will be described in detail, it should be understood that described below is excellent
Select embodiment only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
Fig. 1 is data transmission method flow chart provided in an embodiment of the present invention, as shown in Figure 1, including：
Step 101, in WLAN WLAN, access point AP according to data transfer demands be each site STA dynamic point
It is used in the ascending time slot and/or descending time slot of transmission data, and the gap information is sent to corresponding STA.
The ascending time slot and/or descending time slot information are sent to corresponding STA by AP by sending beacon frame to STA.
The beacon frame（That is Beacon frames）Periodicity sending, data transmission time period T, such as Fig. 2 are carried out according to beacon interval TBTT
It is shown.Wherein, a data transmission time period T, is fixed and is divided into N number of time slot, and transmission time slot TS is also further divided into
Data transmission period T1, two intervals SIFS and feedback transmission time T2, as shown in Figure 3.Newly-increased " use is extended in Beacon frames
Family transmission time slot distribution " field, the field are allocated data transmission slots, i.e., are specifically passed to each time slot in N number of time slot
The up-downlink direction of defeated STA user and the slot transmission is defined, specific to indicate that information is as shown in Figure 4.AP can root
According to the data transfer demands of up-downlink direction, the downstream transmission direction of time slot is flexibly defined.
Step 102, for ascending time slot, AP distributes to the ascending time slot of STA at it and receives the upper line number from corresponding STA
According to frame.
AP receives the uplink data frames and is demodulated in the data transmission period of ascending time slot.When the uplink data frames
When demodulating correct, the STA data transfer demands information therein for the distribution of time slot next time is obtained, and in the ascending time slot
The feedback transmission time in STA send upstream data ACK frames.When the uplink data frames demodulate mistake, AP determines that STA is deposited
In STA data transfer demands, but upstream data ACK frames are not sent to STA.
Step 103, for descending time slot, AP distributes to the descending time slot of STA at it and sends downlink data to corresponding STA
Frame.
AP sends downlink data frame in the data transmission period of descending time slot to corresponding STA, and in the descending time slot
The feedback transmission time in receive downlink data ACK frames that the STA is responded and demodulate, obtain therein for time slot next time
The STA data transfer demands information of distribution.
It is extended in the uplink data frames that STA is transmitted to AP and increases " data transfer demands " field newly, which is set as
1, mark STA also have the demand data uploaded, the field to be set as 0, and mark STA is without upload demand data.STA is responded to AP
It is extended in downlink data ACK frames and increases " data transfer demands " field newly, which is set as 1, and mark STA also has the data uploaded
Demand, the field are set as 0, and mark STA is without upload demand data.That is, " data transfer demands " field can be with
It carries, can also be carried in the ACK frames that STA is fed back to AP in the data frame that normal STA is transmitted to AP.
Fig. 5 is the ends AP provided in an embodiment of the present invention process chart, as shown in figure 5, step includes：
Whether the STA data transfer demands and the ends AP that 1, AP is reported according to each STA have the AP data issued to STA to pass
Defeated demand is allocated the uplink and downlink timeslot for data transmission, i.e., carries out assignment to " distribution of user's transmission time slot " field.
2, AP sends Beacon frames, and " distribution of user's transmission time slot " field information is carried in this data frame.
3, AP starts slot timer.
4, AP obtains the user information value of work at present time slot distribution.
5, AP judges whether work at present time slot is uplink, if it is continues to execute, otherwise goes to step 10.
6, AP receives in data transmission period T1 the uplink data frames of STA transmissions, and obtains and carried in this data frame
Whether STA need instruction information " data transfer demands " field of transmission data frame.
7, after AP is finished receiving, judge whether uplink data frames demodulation is correct, continues to execute if correct, otherwise goes to
Step 9.
8, the transmission of this data is completed, and go to STA feeding back uplink data ACK frames in feedback transmission time T2
Step 12.
9, upstream data demodulates mistake, then not feeding back uplink data ACK frames, and by STA report " data transmission needs
Ask " field is assigned a value of 1, and goes to step 12.
10, AP sends downlink data frame in data transmission period T1 to STA.
11, AP receives the downlink data ACK frames of STA feedbacks in feedback transmission time T2, then completes this after the completion
Data transmission.
12, the value update of slot timer, judges whether the transmission for completing whole time slots, if it is return to step 1, no
Then go to step 4.
Fig. 6 is the ends STA provided in an embodiment of the present invention process chart, as shown in fig. 6, step includes：
1, after STA user receives Beacon frames, data demodulation is carried out, obtain the carrying of Beacon frames includes that " user passes
The information of defeated time slot distribution " field.
2, judge whether there is the transmission time slot for distributing to STA user within this TBTT period, if there is then continuing to execute,
Otherwise step 14 is gone to.
3, STA starts slot timer.
4, judge whether current time slots are working time slot that AP distributes to this user, if it is continue to execute, otherwise turn
To step 12.
5, judge whether the working time slot that AP distributes to this user is ascending time slot, if it is continues to execute, otherwise turns
To step 9.
6, whether there is also data to be sent to " data transfer demands " word after this transmission according to data buffer by STA
Duan Jinhang assignment.
7, STA sends the uplink data frames of a length of T1 when fixed data is transmitted to AP, and " data are also carried in the data frame
Transmission demand " field.
8, STA receives the upstream data ACK frames of AP responses within the feedback transmission time of ascending time slot, completes this data
Transmission, and go to step 13.
9, STA receives the downlink data frame that AP is issued in the data transmission period of descending time slot.
10, after the reception of STA completions downlink data frame, it whether there is data pair to be sent according to data buffer is uploaded
" data transfer demands " field carries out assignment.
11, STA is carried to AP feeding back downlink data ACK frames within the feedback transmission time of descending time slot in the ACK frames
STA " data transfer demands " field information, then completes this data transmission, goes to step 13 after being sent completely.
12, STA keeps silent status in non-user job time slot, does not send and receive data.
13, the value update of slot timer, and go to step 4.
14, STA keeps silent status within the TBTT periods of non-user job, data is not sended and received, next
A TBTT periods start to receive Beacon frames, return to step 1 when reaching.
Fig. 7 is first example of user's transmission time slot allocation field provided in an embodiment of the present invention, when the ends AP as shown in Figure 7
Gap assigning process, setting timeslot number N are 4, and current online association STA numbers of users are 4, and user 1 and user 2 have upper hair data transmission
Demand, user 3 and user 4 have AP to issue demand data.
Whether the STA data transfer demands and the ends AP that 1, the ends AP are reported according to each STA have the AP data issued to STA
Transmission demand is allocated working time slot.
2, time slot 1 is distributed into user 1, and sets the time slot to ascending time slot；Time slot 2 is distributed into user 2, and will
The time slot is set as ascending time slot；Time slot 3 is distributed into user 3, and sets the time slot to descending time slot；Time slot 4 is distributed
It is set as descending time slot to user 4, and by the time slot；Specifically " distribution of user's transmission time slot " field configuration is as shown in Figure 7.
3, the ends AP carry " distribution of user's transmission time slot " field in Beacon frames and send.
Fig. 8 is second example of user's transmission time slot allocation field provided in an embodiment of the present invention, when the ends AP as shown in Figure 8
Gap assigning process, setting timeslot number N are 4, and current online association STA numbers of users are 2, and user 1 and user 2 have STA on AP
It passes demand data and AP issues the demand of data to STA.
Whether the STA data transfer demands and the ends AP that 1, the ends AP are reported according to each STA have the AP data issued to STA
Transmission demand is allocated time slot.
2, time slot 1 is distributed into user 1, and sets the time slot to ascending time slot；Time slot 2 is distributed into user 1, and will
The time slot is set as descending time slot；Time slot 3 is distributed into user 2, and sets the time slot to ascending time slot；Time slot 4 is distributed
It is set as descending time slot to user 2, and by the time slot；Specifically " distribution of user's transmission time slot " field configuration is as shown in Figure 8.
3, the ends AP carry " distribution of user's transmission time slot " field in Beacon frames and send.
Current online association STA user described in being illustrated in Fig. 7 and Fig. 8 two refers to that STA user is closed by STA
Connection process obtains the user of user index mark.Wherein, the STA association process includes：
1, STA user initiates association request to AP.
2, AP distributes unique STA user indexes information to the STA user.
3, AP carries the STA user index information that AP distributes to STA user in association response frame, and anti-to STA user
Present associated response.
4, after STA receives association response frame, the STA user index information of AP distribution is obtained, completes association process.
The association response frame extension that AP is fed back to STA increases " instruction of STA user indexes " field newly, which distributed by AP
To the user index mark of STA user, the index instruction of each STA user is unique mark.
Fig. 9 is data transmission set block diagram provided in an embodiment of the present invention, as shown in figure 9, including：
Time slot allocating unit, for being each site STA dynamic point according to data transfer demands in WLAN WLAN
It is used in the ascending time slot and/or descending time slot of transmission data；
Data receipt unit, the ascending time slot for distributing to STA at it receive the uplink data frames from corresponding STA；
Data transmission unit, for the ascending time slot and/or descending time slot information to be sent to corresponding STA, and
It is distributed to the descending time slot of STA and sends downlink data frame to corresponding STA；
Transmission demand acquiring unit, for obtaining STA data transfer demands information or acquisition in the uplink data frames
STA respond the downlink data frame and the downlink data ACK frames responded in STA data transfer demands information, to carry out down
Time slot distribution；
Allocation unit is indexed, the association request for being initiated according to STA distributes STA user index information for STA user,
And the association response frame for carrying the STA user indexes information is sent to by STA by data transmission unit, will pass through STA
User index information association AP and corresponding STA；
Wherein, the data transmission unit to STA by sending beacon frame, by the ascending time slot and/or descending time slot
Information is sent to corresponding STA.
The STA user index information assigning process of the equipment is as follows：
The index allocation unit receives STA Client-initiated association requests via the data receipt unit, according to institute
Association request is stated, distributes unique STA user indexes information for the STA user, and STA user indexes information setting is existed
In association response frame, it is sent to STA user via the data transmission unit, after receiving association response frame so as to STA, is obtained
The STA user index information of AP distribution, completes association process.
The data transfer procedures of the equipment are as follows：
Each STA data transfer demands and the ends AP that the time slot allocating unit of AP is obtained according to transmission demand acquiring unit
Whether there are the AP data transfer demands issued to STA, transmission time slot is specifically distributed, the distribution information is in beacon Beacon
It is sent via data transmission unit in frame, so that STA user is according to the information of the Beacon frames of reception, obtains respective data
The uplink and downlink of sending time slots information and the slot transmission defines.
AP transmits downlink data frame on the descending time slot for distribute to STA user, and STA is received after the downlink data frame right
To AP feeding back downlink data ACK frames in the feedback transmission time answered, and STA is according to whether need transmission data demand, in institute
It states carrying " data transfer demands " field, AP in downlink data ACK frames and needs root on the dispatching distribution of Beacon frames next time
The allocation schedule of user is carried out according to this instruction information.
STA transmits uplink data frames on the ascending time slot for distribute to STA user, and AP is received after the uplink data frames right
To STA feeding back uplink data ACK frames in the feedback transmission time answered；STA is according to whether need transmission data demand, in transmission
" data transfer demands " field is carried in upstream data ACK frames, AP needs basis on the dispatching distribution of Beacon frames next time
This instruction information carries out the allocation schedule of user.
Although describing the invention in detail above, but the invention is not restricted to this, those skilled in the art of the present technique
It can be carry out various modifications with principle according to the present invention.Therefore, all to be changed according to made by the principle of the invention, all it should be understood as
Fall into protection scope of the present invention.
Claims (10)
1. a kind of data transmission method, which is characterized in that including：
In WLAN WLAN, access point AP is that each site STA dynamic allocation are used for transmission number according to data transfer demands
According to ascending time slot and descending time slot, and the gap information is sent to corresponding STA；
For ascending time slot, AP distributes to the ascending time slot of STA at it and receives the uplink data frames from corresponding STA；
For descending time slot, AP distributes to the descending time slot of STA at it and sends downlink data frame to corresponding STA；
Wherein, AP is carried out down according to the STA data transfer demands information for the distribution of time slot next time in the uplink data frames
Time slot distribution；Or for next in responding the downlink data frame according to the STA and the downlink data ACK frames responded
The STA data transfer demands information of secondary time slot distribution carries out time slot next time and distributes.
2. according to the method described in claim 1, it is characterized in that, by sending beacon frame to STA, AP is by the ascending time slot
And/or descending time slot information is sent to corresponding STA.
3. according to the method described in claim 2, it is characterized in that, described in AP receives in the data transmission period of ascending time slot
Uplink data frames simultaneously demodulate, and when uplink data frames demodulation is correct, obtain the STA therein for the distribution of time slot next time
Data transfer demands information, and within the feedback transmission time of the ascending time slot upstream data ACK frames are sent to STA.
4. according to the method described in claim 3, it is characterized in that, when the uplink data frames demodulate mistake, AP determines STA
There are STA data transfer demands.
5. according to the method described in claim 2, it is characterized in that, AP in the data transmission period of descending time slot to corresponding
STA sends downlink data frame, and the downlink data of the STA responses is received within the feedback transmission time of the descending time slot
ACK frames simultaneously demodulate, and obtain the STA data transfer demands information therein for the distribution of time slot next time.
6. according to the method described in claim 1-5 any one, which is characterized in that further include：
The association request that AP is initiated according to STA distributes STA user index information for STA, and will carry the STA user indexes
The association response frame of information is sent to STA, will pass through STA user index information association AP and corresponding STA.
7. a kind of data transmission set, which is characterized in that including：
Time slot allocating unit, for being that each site STA dynamically distributes use according to data transfer demands in WLAN WLAN
In the ascending time slot and descending time slot of transmission data；
Data receipt unit, the ascending time slot for distributing to STA at it receive the uplink data frames from corresponding STA；
Data transmission unit is distributed to for the ascending time slot and descending time slot information to be sent to corresponding STA, and at it
The descending time slot of STA sends downlink data frame to corresponding STA；
Wherein, time slot allocating unit is according to the STA data transfer demands for the distribution of time slot next time in the uplink data frames
Information carries out time slot next time and distributes；Or the downlink data frame is responded according to the STA and the downlink data ACK that responds
STA data transfer demands information in frame for the distribution of time slot next time carries out time slot next time and distributes.
8. equipment according to claim 7, which is characterized in that the data transmission unit by STA send beacon frame,
The ascending time slot and/or descending time slot information are sent to corresponding STA.
9. equipment according to claim 7, which is characterized in that further include：
Transmission demand acquiring unit is rung for obtaining the STA data transfer demands information in the uplink data frames or obtaining STA
STA data transfer demands information in answering the downlink data frame and the downlink data ACK frames responded, when to carry out next time
Gap is distributed.
10. according to the equipment described in claim 7-9 any one, which is characterized in that further include：
Allocation unit is indexed, the association request for being initiated according to STA is distributed STA user index information for STA user, and led to
It crosses data transmission unit and the association response frame for carrying the STA user indexes information is sent to STA, will pass through STA user
Index information associated AP and corresponding STA.
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| CN201210318738.3A CN103687044B (en) | 2012-08-31 | 2012-08-31 | A kind of data transmission method and equipment |
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| CN201210318738.3A CN103687044B (en) | 2012-08-31 | 2012-08-31 | A kind of data transmission method and equipment |
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