CN104219777B - The channel access method in broadband high-speed radio station - Google Patents
The channel access method in broadband high-speed radio station Download PDFInfo
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- CN104219777B CN104219777B CN201410469383.7A CN201410469383A CN104219777B CN 104219777 B CN104219777 B CN 104219777B CN 201410469383 A CN201410469383 A CN 201410469383A CN 104219777 B CN104219777 B CN 104219777B
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Abstract
The invention discloses a kind of channel access method in broadband high-speed radio station, including：Selection is shaken hands during CSMA channel access and data validation mode sends data, is cascaded according to identical datum target, validation testing；When shaking hands failure, kept out of the way for this datum target, while the upper layer data of the cascade bag of caching is participated in into cascade again；When shaking hands successfully, cascade data is delivered into physical layer to send, and after data transmission, etc. ACK frames to be received, the correctness that each time slot data in ACK frames are judged after ACK frames is received, if there is wrong data, is kept out of the way according to the upper layer data bag number cascaded, the corresponding upper layer data bag feeding cascading queue of wrong data time slot is participated in into cascade again when keeping out of the way, while the upper layer data bag corresponding to correct data time slot is deleted.The channel access method of the present invention can reduce re-transmission data volume, and adaptive upper layer data bag efficiency of transmission is kept out of the way.
Description
Technical field
The present invention relates to a kind of channel access method, especially a kind of channel access method in broadband high-speed radio station.Belong to
Wireless communication technology field.
Background technology
In current wireless broadband Internet access, due to there are concealed nodes, exposed node problems so that broadband access process
It is more complicated compared to access in radio, therefore access efficiency is even more important in wireless broadband Internet access, in order in wireless access to the greatest extent
Access efficiency is improved to greatest extent, and ensures the QoS of upper layer data business transmission, it is necessary to accessing related protocol in link layer
Optimized to greatest extent.Existing most of access protocol can not be preferably by the transmission of upper layer data bag, cascade, re-transmission etc.
Process combines, and simply retransmits the cascade data bag of whole link layer when retransmitting, and do not examined in the calculating kept out of the way
Consider the requirement of real-time of upper layer data bag, therefore in actual applications, running into channel quality has the application environment of fluctuation, its data
The efficiency of transmission of business has larger fluctuating.
The feelings that channel quality is changeable, upper-layer service type is changeable in addition, Ad Hoc networks often face in actual applications
Condition, therefore, access efficiency and data transfer in network can have very big fluctuating because of factors above, and data volume repeats asking for transmission
Topic is serious.
The content of the invention
Connect the invention aims to the defect for solving above-mentioned prior art there is provided a kind of channel in broadband high-speed radio station
Enter method, this method can reduce re-transmission data volume, and adaptive upper layer data bag efficiency of transmission is kept out of the way.
The purpose of the present invention can be reached by adopting the following technical scheme that：
The channel access method in broadband high-speed radio station, methods described includes：Select to shake hands during CSMA channel access
And data validation mode sends data, cascaded according to identical datum target, validation testing；When shaking hands failure, for
This datum target is kept out of the way, while the upper layer data of the cascade bag of caching is participated in into cascade again；, will when shaking hands successfully
Cascade data delivers physical layer transmission, and after data transmission, waits ACK frames to be received, receive and ACK frames are judged after ACK frames
In each time slot data correctness, if there is wrong data, kept out of the way according to the upper layer data bag number cascaded, moved back
Wrong data time slot corresponding upper layer data bag feeding cascading queue is participated in into cascade again when keeping away, while by correct data time slot
Corresponding upper layer data bag is deleted.
As a kind of preferred scheme, methods described specifically includes following steps：
1) be directed to data service, link layer use CSMA channel access, during CSMA channel access selection shake hands and
Data validation mode sends data, into step 2)；
2) shake hands and data validation mode data send in, data are entered according to identical datum target, validation testing
Row cascade, while the upper layer data bag cascaded is cached, into step 3)；
3) sender sends RTS call frames, and recipient sends CTS acknowledgement frames after RTS call frames are received, if sender receives
To CTS acknowledgement frames, illustrate success of shaking hands, then cascade data is delivered into physical layer sends, into step 4)；If sender does not receive
To CTS acknowledgement frames, illustrate to shake hands unsuccessfully, then back off time of shaking hands is set for the datum target that this data is sent, moved back
Keep away, while the upper layer data bag of cascade of caching is re-fed into cascading queue, waits cascade, this step is re-executed after cascade
Suddenly；
4) after data transmission, recipient is waited to reply ACK frames, the access protocol of recipient adds each in ACK frames
The judgement symbol of individual time slot data, for representing time slot data correctness information, replys ACK frames to sender, into step 5)；
If 5) sender does not have found the wrong data mark of any time slot in ACK frames, by step 2) middle caching
The deletion of upper layer data bag has been cascaded, next transmission is then done；If sender has found that wrong Data Labels is present in ACK frames,
The corresponding upper layer data bag of wrong data time slot is then calculated, backoff period number is then calculated according to the upper layer data bag number cascaded
Kept out of the way, the corresponding upper layer data bag feeding cascading queue of wrong data time slot is participated in into cascade again when keeping out of the way, simultaneously
Upper layer data bag corresponding to correct data time slot is deleted.
It is used as a kind of preferred scheme, step 4) judgement symbol that each time slot data is added in ACK frames, it is used for
Time slot data correctness information is represented, it is specific as follows：
The correctness of each time slot data of bit information flags is used in ACK frames, by judging corresponding bit mark
To understand whether the time slot data transfer succeeds, bit are that 0 expression time slot data are sent successfully, and bit are 1 expression time slot
Data send failure.
It is used as a kind of preferred scheme, step 3) it is described that to keep out of the way be in preceding 5 call failures, using binary exponential backoff
Mode, if continuous 5 call failures, is changed to fixation and keeps out of the way mode.
Be used as a kind of preferred scheme, step 5) it is described calculating backoff period number consider what this link layer data was cascaded
Upper layer data bag number, it is assumed that do not consider that the backoff period number calculated during cascade data bag number is α, exceed for cascade data bag number
Equipment caching 50%, that is, think that overstocked data are more, now obtains correcting backoff period number by correcting processIt is no
Then, when cascade data bag number is less than equipment is cached 50%, that is, think to overstock data still in the reasonable scope, now backoff period
Number is still α.
Specifically, the synchronizing information of the ACK frames is including wheel synchronization type, source MAC, link-quality, time slot data just
True property information and CRC.
The present invention has following beneficial effect relative to prior art：
1st, channel access method of the invention is on the basis of based on CSMA access protocols, by data confirming process
The judgement symbol of corresponding time slot data is added, the corresponding upper layer data bag of wrong data time slot can be calculated, and in backoff period
The factor of cascade upper layer data bag number is considered in calculating, at the same the corresponding upper layer data bag of backoff period keep out of the way and
Retransmit, the upper layer data in the realization with back-off protocols, this access protocol is retransmitted relative to the generality for following 802.11 specifications
The efficiency of transmission of bag has obtained higher, and is combined with the cascade process of data, can further improve system effectiveness.
2nd, channel access method of the invention is during CSMA channel access, and the target for failure of shaking hands can set one
Individual back off time of shaking hands, no longer sends request for this datum target within a certain period of time, and this time is shaken hands corresponding upper strata
Packet, then can participate in cascade again, the real-time of new business data not influenceed, according to datum target can shake hands moving back
Keep away, and it is adjustable to keep out of the way mode.
3rd, of the invention channel access method and existing protocol can only distinguish after cascade the correct of whole link layer data bag
Property compare, during CSMA channel access, data receiver is understanding the data of each time slot shared by feedback traffic data just
True property mark, on the basis of physical layer and the differentiation of MAC layer functional module is taken into account, make use of physical layer information to greatest extent.
4th, channel access method of the invention allows broadband high-speed radio station for different upper layer application demands, currently
The information such as channel status, initiate configurable, efficient channel access process.
Brief description of the drawings
Fig. 1 is schematic diagram of the physical layer in the embodiment of the present invention 1 according to three kinds of physical channels of TDMA model splits.
Fig. 2 is the data transmission flow schematic diagram during CSMA channel access of the embodiment of the present invention 1.
Fig. 3 is that the embodiment of the present invention 1 shakes hands and shaken hands what failure was kept out of the way in data call during CSMA channel access
Calculating process schematic diagram.
Fig. 4 is the synchronizing information schematic diagram of ACK frames in the embodiment of the present invention 1.
Embodiment
Embodiment 1：
The channel access method of the present embodiment, comprises the following steps：
1) as shown in figure 1, in physical layer in units of time slot, using TDMA (Time Division Multiple
Access, time division multiple acess) model split channel, channel is divided into data channel, voice channel and service channel, figure often
32 time slots are a time frame, and slot length can be configured according to actual demand, three kinds of data channel, voice channel and service channel
Physical channel in a time frame according to 28: 2: 2 pro rate, correspond to respectively the data service on upper strata, voice service and
Duties business；
D in figurexRepresent data slot, VxRepresent speech time slot, BxRepresent that (x represents 32 time slots, serial number 0 to duties time slot
~31), wherein speech Time Slot Occupancy position is time frame the 15th, 30 time slots, and duties Time Slot Occupancy position is the 31st, 32 time slots, its
Remaining time slot is data slot.So model split can ensure basic audio quality, ensure basic duties interaction demand
On the basis of, message transmission rate is maximized, transmission opportunity as much as possible is provided for high-speed data service.
If higher to Tone Via requirement of real-time in actual demand, or voice data amount is larger, can use with
Lower a and b two schemes are solved：
A, on the premise of physical layer frame structure is not changed, by voice data be arranged in data slot transmission, so may be used
With flexible allocation resource, but speech quality has certain loss；
B, change physical layer frame structure, increase speech number of time slots, for example, the 7th, 23 time slots can be divided into speech
Time slot, so may further ensure that speech quality, but can reduce data traffic transmission efficiency；
Distribution with speech time slot is identical, if duties interaction is more in actual demand, can be suitably with reference to speech time slot
The mode of distribution is carried out.
2) for voice service and duties business, the TDMA slot table that link layer is divided using physical layer is accessed；It is right
In data service, link layer using TDMA or CSMA, (visit by Carrier Sense Multiple Access, Carrier-Sense Multiple
Ask) channel access, if using CSMA channel access, into step 3)；
3) during CSMA channel access, from shake hands and data validation, only shake hands, a tape data validation and without nothing of shaking hands
Any one mode is selected to send data in four kinds of sending methods of data validation, if selection is shaken hands and data validation mode sends number
According into step 4)；
Following steps 4)~7) be during CSMA channel access data transmission flow, as shown in Figure 2；Wherein step 4)
~the calculating process 5) kept out of the way for failure of shaking hands and shake hands during data call during CSMA channel access, as shown in Figure 3；
4) shake hands and data validation mode data send in, data are entered according to identical datum target, validation testing
Row cascade, while the upper layer data bag cascaded is cached, into step 5)；
5) sender sends RTS call frames, and recipient sends CTS after RTS (Request To Send) call frame is received
(Clear To Send) acknowledgement frame, if sender receives CTS acknowledgement frames, illustrates success of shaking hands, then cascade data is delivered into thing
Manage layer to send, into step 6)；If sender does not receive CTS acknowledgement frames, illustrate to shake hands unsuccessfully, then sent for this data
Datum target sets back off time of shaking hands, and is kept out of the way, while the upper layer data bag of cascade of caching is re-fed into a grade union team
Row, wait cascade, this step are re-executed after cascade；
In step 5) in, keeping out of the way for shaking hands is sent just for single data, if occurring new business datum in keeping out of the way,
Then calculate and shaken hands for another time, that is to say that an independent data are sent, new handshake procedure is not by the shadow of last failure of shaking hands
Ring, and independently kept out of the way when shaking hands failure；It is described that to keep out of the way be in preceding 5 call failures, using binary exponential backoff
Mode, if continuous 5 call failures, is changed to fixation and keeps out of the way mode, can so avoid moving back when channel quality is bad
Circumvent it is many, wherein the chronomere kept out of the way be the second；The binary exponential backoff is exactly that, using 2n as maximum back off time, n is to lose
Lose number of times；It is to be used as each maximum back off time using a set time that the fixation, which is kept out of the way,；Both differences are exactly that index is moved back
Keep away that the stand-by period that more fails is longer, the fixed stand-by period kept out of the way is unrelated with the frequency of failure.
6) after data transmission, wait recipient to reply ACK (Acknowledgement) frame, i.e. data validation frame, receive
The access protocol of side uses the correctness of each time slot data of bit information flags in ACK frames, you can with corresponding by judging
The mark of bit understands whether the time slot data transfer succeeds, and bit are that 0 expression time slot data are sent successfully, and bit are 1
Then represent that time slot data send failure；After recipient replys ACK frames to sender, into step 7)；
As shown in figure 4, the synchronizing information of the ACK frames includes wheel synchronization type, source MAC, link-quality, time slot data
Correctness information and CRC, wherein：
Wheel synchronization type：Different time slot types are distinguished, such as calls slot synchronization information, confirm slot synchronization information etc.,
For parsing synchronizing information according to different types of mode；
Source MAC：Indicate the MAC Address of synchronizing information sender；
Link-quality：Represent that this confirms the link-quality of corresponding data sender data receiver；
Time slot data correctness information：In the case of indicating that multi-slot data is sent, the correctness of each time slot corresponding data；
CRC：The CRC check for synchronizing information is used；
If 7) sender does not have found the wrong data mark (all bit are 0) of any time slot in ACK frames, will
Step 4) the middle upper layer data of the cascade bag deletion cached, then do next transmission；If sender has found wrong in ACK frames
There is (it is 1 to have bit) in Data Labels, then the corresponding upper layer data bag of wrong data time slot is calculated, when then calculating is kept out of the way
Gap number is kept out of the way, and the calculating of backoff period number can be more comprising cascade upper layer data bag number, the frequency of failure, neighbor node number etc.
The factor of kind, and the present embodiment mainly considers the upper layer data bag number that this link layer data is cascaded, when keeping out of the way by mistake
The corresponding upper layer data bag feeding cascading queue of data slot participates in cascade again, while will be upper corresponding to correct data time slot
Layer data bag is deleted, so as to minimize re-transmission data volume, improves link-layer efficiency；
In step 7) when calculating backoff period number, it is assumed that it is α not consider the backoff period number that is calculated during cascade data bag number,
Exceed equipment caching 50% for cascade data bag number, that is, think that overstocked data are more, now corrected by correcting process
Backoff period numberOtherwise, when cascade data bag number is less than equipment is cached 50%, that is, think that overstocking data is still closing
In the range of reason, now backoff period number is still α.That is, when cascade data bag is more, keeping out of the way less, cascade
The less situation of packet, then keep out of the way more, when can further improve upper-layer protocol by the above method and resending packet
Efficiency, so as to improve the QoS of business.
In summary, the transmission process of the whole data of the inventive method sends comprising calling, confirming call, data, counted
According to multiple links are confirmed, flow keeps out of the way two backoff procedures comprising shaking hands to keep out of the way with data failure (wrong data occur),
During calculating data failure is kept out of the way, the upper layer data that this link layer data is cascaded is considered when calculating backoff period number
Bag number, improves efficiency when upper-layer protocol resends packet.
It is described above, it is only patent preferred embodiment of the present invention, but the protection domain of patent of the present invention is not limited to
This, any one skilled in the art is in the scope disclosed in patent of the present invention, according to the skill of patent of the present invention
Art scheme and its inventive concept are subject to equivalent substitution or change, belong to the protection domain of patent of the present invention.
Claims (5)
1. the channel access method in broadband high-speed radio station, it is characterised in that：Methods described includes：During CSMA channel access
Selection is shaken hands and data validation mode sends data, is cascaded according to identical datum target, validation testing；Shaking hands unsuccessfully
When, kept out of the way for this datum target, while the upper layer data of the cascade bag of caching is participated in into cascade again；Shaking hands into
During work(, cascade data is delivered into physical layer and sent, and after data transmission, waits ACK frames to be received, sentences after receiving ACK frames
The correctness of each time slot data, if there is wrong data, is moved back according to the upper layer data bag number cascaded in disconnected ACK frames
Keep away, the corresponding upper layer data bag feeding cascading queue of wrong data time slot is participated in into cascade again when keeping out of the way, while will be correct
Upper layer data bag corresponding to data slot is deleted；
Methods described specifically includes following steps：
1) data service is directed to, link layer uses CSMA channel access, selects to shake hands and data during CSMA channel access
Validation testing sends data, into step 2)；
2) shake hands and data validation mode data send in, data according to identical datum target, validation testing carry out level
Connection, while the upper layer data bag cascaded is cached, into step 3)；
3) sender sends RTS call frames, and recipient sends CTS acknowledgement frames after RTS call frames are received, if sender receives
CTS acknowledgement frames, illustrate success of shaking hands, then cascade data is delivered into physical layer sends, into step 4)；If sender does not receive
CTS acknowledgement frames, illustrate to shake hands unsuccessfully, then set back off time of shaking hands for the datum target that this data is sent, kept out of the way,
The upper layer data bag of cascade of caching is re-fed into cascading queue simultaneously, cascade is waited, this step is re-executed after cascade；
4) after data transmission, recipient is waited to reply ACK frames, when the access protocol of recipient adds each in ACK frames
The judgement symbol of gap data, for representing time slot data correctness information, replys ACK frames to sender, into step 5)；
If 5) sender does not have found the wrong data mark of any time slot in ACK frames, by step 2) the middle level cached
Join upper layer data bag to delete, then do next transmission；If sender has found that wrong Data Labels is present in ACK frames, count
The corresponding upper layer data bag of wrong data slot is calculated, then calculating backoff period number according to the upper layer data bag number cascaded is carried out
Keep out of the way, the corresponding upper layer data bag feeding cascading queue of wrong data time slot is participated in into cascade again when keeping out of the way, while will just
Upper layer data bag corresponding to true data slot is deleted.
2. the channel access method in broadband high-speed radio station according to claim 1, it is characterised in that：Step 4) it is described
The judgement symbol of each time slot data is added in ACK frames, it is specific as follows for representing time slot data correctness information：
In ACK frames use each time slot data of bit information flags correctness, by judge corresponding bit mark come
Solve whether the time slot data transfer succeeds, bit are that 0 expression time slot data are sent successfully, and bit are 1 expression time slot data
Send failure.
3. the channel access method in broadband high-speed radio station according to claim 1, it is characterised in that：Step 3) described keep out of the way
It is, in preceding 5 call failures, using binary exponential backoff mode, if continuous 5 call failures, to be changed to the fixed side of keeping out of the way
Formula.
4. the channel access method in broadband high-speed radio station according to claim 1, it is characterised in that：Step 5) calculating
The upper layer data bag number that this link layer data is cascaded is considered during backoff period number, it is assumed that when not considering cascade data bag number
The backoff period number of calculating is α, exceedes equipment caching 50% for cascade data bag number, that is, thinks that overstocked data are more, now
Obtain correcting backoff period number by correcting processOtherwise, when cascade data bag number be less than equipment cache 50%,
Think to overstock data still in the reasonable scope, now backoff period number is still α.
5. the channel access method in broadband high-speed radio station according to claim 1, it is characterised in that：The ACK frames it is same
Walking information includes wheel synchronization type, source MAC, link-quality, time slot data correctness information and CRC.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002054671A2 (en) * | 2001-01-02 | 2002-07-11 | At & T Corp. | Random medium access methods with backoff adaptation to traffic |
| CN103327638A (en) * | 2013-04-17 | 2013-09-25 | 东南大学 | Wireless media access control method in ultra-narrow-band communication mode |
| CN103369597A (en) * | 2012-03-31 | 2013-10-23 | 中兴通讯股份有限公司 | Radio-frame sending method and device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002054671A2 (en) * | 2001-01-02 | 2002-07-11 | At & T Corp. | Random medium access methods with backoff adaptation to traffic |
| CN103369597A (en) * | 2012-03-31 | 2013-10-23 | 中兴通讯股份有限公司 | Radio-frame sending method and device |
| CN103327638A (en) * | 2013-04-17 | 2013-09-25 | 东南大学 | Wireless media access control method in ultra-narrow-band communication mode |
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