CN102316013A - Method and device for regulating maximum message size - Google Patents
Method and device for regulating maximum message size Download PDFInfo
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- CN102316013A CN102316013A CN2010102238285A CN201010223828A CN102316013A CN 102316013 A CN102316013 A CN 102316013A CN 2010102238285 A CN2010102238285 A CN 2010102238285A CN 201010223828 A CN201010223828 A CN 201010223828A CN 102316013 A CN102316013 A CN 102316013A
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Abstract
The invention discloses a method and a device for regulating a maximum message size. The method comprises the following steps that: the tolerance upper limit and the tolerance lower limit of a wrong packet rate are preset, wherein the tolerance upper limit of the wrong packet rate is smaller than the tolerance lower limit of the wrong packet rate, a sender aggregates medium access control protocol data units (MPDUs) in a send buffer according to the maximum message size of a current aggregate medium access control protocol data unit (A-MPDU) to obtain an A-MPDU message; the sender transmits the A-MPDU message, after transmission, the wrong packet rate of the message is counted, and when the wrong packet rate is smaller than the tolerance upper limit of the wrong packet rate, the maximum message size of the current A-MPDU is enlarged; when the wrong packet rate is greater than the tolerance upper limit of the wrong package rate, the maximum message size of the current A-MPDU is shortened; and otherwise the maximum message size of the current A-MPDU is kept. By the method, the throughput of a transceiver is increased.
Description
Technical field
The present invention relates to the message convergence technical field, be specifically related to method and device that medium access control protocol data cell (A-MPDU, Aggregate MAC Protocol Data Unit) maximum message segment length is converged in adjustment.
Background technology
In order to improve throughput; Institute of Electrical and Electric Engineers (IEEE; Institute of Electrical and Electronics Engineers) 802.11n is to 802.11 medium access control (MAC; Medium Access Control) layer has carried out a series of improvement, and converging Medium Access Control (MAC) Protocol Data Unit (A-MPDU, Aggregate MAC Protocol Data Unit) transmitting-receiving is exactly one of them.
The A-MPDU technology pools an A-MPDU message with a plurality of MPDU messages and sends.Fig. 1 is the structural representation of A-MPDU message, and is as shown in Figure 1, and the A-MPDU message only uses a physical layer (PHY) head, only need seize a secondary channel when A-MPDU message sends, and effectively improved channel utilization.Simultaneously, the transmission of each MPDU interval minimum can be 0 in the A-MPDU message, and all MPDU use piece affirmation (BA, a Block Ack) message to confirm in the A-MPDU message, have greatly reduced the overhead of agreement.Theoretical research shows: under noiseless environment, the transmission performance that 32 MPDU pool an A-MPDU be single MPDU send performance one by one 6-7 doubly.
According to agreement regulation, send receiving-transmitting sides before the A-MPDU message and can negotiate capability set parameters such as maximum MPDU number that A-MPDU comprises, A-MPDU maximum message segment length.When no channel disturbance, as often as possible converge MPDU in the buffer memory, make the A-MPDU message length big as far as possible simultaneously according to the capability set parameter limit, send throughput to improve.But in practical application; Often have various interference in the channel, channel is unlikely very pure, and interference can cause some bit to send failure; Thereby cause whole M PDU checksum error and have to re-transmission; Therefore in traditional I EEE802.11a/b/g,, when electromagnetic environment is relatively poor, often adopt the branch sheet mode to reduce each length of data package of sending in order to reduce MPDU retransmission probability and expense.The several times of the single often MPDU message length of A-MPDU message and even tens of times, the existence of interference cause some MPDU among the A-MPDU to retransmit because of sending failure, even some MPDU also need repeatedly retransmit sometimes.The MPDU of these re-transmissions has not only wasted channel resource, but also can cause the software and hardware overhead of system.Exist under the situation about disturbing at channel, be not that the big more throughput of A-MPDU message length is just big more, but under the certain interference situation, have optimum A-MPDU message length.
In the prior art, be defined in according to agreement and set up BA when mechanism, A-MPDU maximum message segment length and maximum that receiving-transmitting sides is arranged both sides through consultation converge the MPDU number.According to these two restrictions, it is that an A-MPDU sends that the MPDU in the transmission buffer memory is as often as possible converged when sending data.
The shortcoming of prior art is: because the existence of channel disturbance, each A-MPDU message length that sends not is an optimal result, causes throughput of system can't reach maximum; Because A-MPDU message MPDU number bigger, that converge is many; It is also many that thereby the back that is interfered retransmits MPDU; Cause channel resource to be wasted, and need expend system resource, cause the system hardware and software resource to be wasted owing to converge and retransmit all at every turn.
Summary of the invention
The present invention provides the method and the device of adjustment maximum message segment length, to improve A-MPDU packet sending and receiving throughput of system.
Technical scheme of the present invention is achieved in that
A kind of method of adjusting maximum message segment length is provided with the Packet Error Rate tolerance upper limit and Packet Error Rate tolerance lower limit in advance, wherein, the Packet Error Rate tolerance upper limit＜Packet Error Rate tolerance lower limit, this method comprises:
Transmit leg converges the MPDU that sends in the buffer memory according to the current medium access control protocol data cell A-MPDU maximum message segment length that converges, and obtains the A-MPDU message;
Transmit leg sends the A-MPUD message, and transmission finishes, and adds up the Packet Error Rate of this message, goes up in limited time less than the Packet Error Rate tolerance when said Packet Error Rate, increases current A-MPDU maximum message segment length; Prescribe a time limit down greater than the Packet Error Rate tolerance when said Packet Error Rate, reduce current A-MPUD maximum message segment length; Otherwise, keep current A-MPDU maximum message segment length constant.
Further comprise after the Packet Error Rate of said this message of statistics:
Calculate the product of a and said Packet Error Rate, calculate the product of the Packet Error Rate after the renewal of a 1-a and a last A-MPDU message simultaneously; With this two products addition, upgrade said Packet Error Rate with gained and value, wherein, a is preset constant, and 0＜a＜0.5;
And said Packet Error Rate is less than being limited in the Packet Error Rate tolerance: the Packet Error Rate after the renewal is tolerated the upper limit less than Packet Error Rate;
Said Packet Error Rate is limited to down greater than the Packet Error Rate tolerance: the Packet Error Rate after the renewal is tolerated lower limit greater than Packet Error Rate.
The current A-MPDU maximum message segment of said increase length comprises:
The difference of the said Packet Error Rate after calculating the Packet Error Rate tolerance upper limit and upgrading; With this difference divided by the said Packet Error Rate after upgrading; The gained quotient multiply by preset A-MPDU maximum message segment length adjust upward step-length; With gained product and the addition of current A-MPDU maximum message segment length, the current A-MPDU maximum message segment length after obtaining upgrading.
Further comprise after the said current A-MPDU maximum message segment length after obtaining upgrading:
Whether current A-MPDU maximum message segment length after judge upgrading consult the A-MPDU maximum message segment length that obtain greater than two the sending out of transmitting-receiving, if, with the two A-MPDU maximum message segment length of consulting to obtain sent out of transmitting-receiving as the current A-MPDU maximum message segment length after upgrading.
The current A-MPDU maximum message segment of said minimizing length comprises:
The difference of said Packet Error Rate after calculating is upgraded and Packet Error Rate tolerance lower limit; With this difference divided by the said Packet Error Rate after upgrading; The gained quotient multiply by preset A-MPDU maximum message segment length adjust step-length downwards; Current A-MPDU maximum message segment length is deducted the gained product, the current A-MPDU maximum message segment length after obtaining upgrading.
Said transmit leg is according to current A-MPDU maximum message segment length, further comprises before converging sending MPDU in the buffer memory:
Preset A-MPDU maximum message segment length lower limit;
Further comprise after the said current A-MPDU maximum message segment length after obtaining upgrading:
Whether the current A-MPDU maximum message segment length after judge upgrading less than A-MPDU maximum message segment length lower limit, if, with A-MPDU maximum message segment length lower limit as the current A-MPDU maximum message segment length after upgrading.
Said transmit leg is according to current A-MPDU maximum message segment length, further comprises before converging sending MPDU in the buffer memory:
Preset A-MPDU maximum message segment length lower limit; And; With 0 and the Packet Error Rate tolerance upper limit between scope division be a plurality of intervals that adjust upward; According to each interval value from small to large; For each interval an A-MPDU maximum message segment length is set with descending order, and the A-MPDU maximum message segment length that is provided with for each is interval A-MPDU maximum message segment length of consulting to obtain less than receiving-transmitting sides, greater than A-MPDU maximum message segment length lower limit;
The current A-MPDU maximum message segment of said increase length is: confirm the interval that adjusts upward at said Packet Error Rate place, the A-MPDU maximum message segment length that will be provided with for this interval is as the current A-MPDU maximum message segment length after upgrading.
Said transmit leg is according to current A-MPDU maximum message segment length, further comprises before converging sending MPDU in the buffer memory:
Preset A-MPDU maximum message segment length lower limit; And; Packet Error Rate is tolerated that the scope division between lower limit and 100% is that a plurality of downward adjustment are interval; According to each interval value from small to large; For each interval an A-MPDU maximum message segment length is set with descending order, and the A-MPDU maximum message segment length that is provided with for each is interval A-MPDU maximum message segment length of consulting to obtain less than receiving-transmitting sides, greater than A-MPDU maximum message segment length lower limit;
The current A-MPDU maximum message segment of said minimizing length is: the downward adjustment of confirming said Packet Error Rate place is interval, the current A-MPDU maximum message segment length of the A-MPDU maximum message segment length that will be provided with for this interval after as renewal.
A kind of device of adjusting maximum message segment length, this device comprises:
MPDU sends cache module, the MPDU that buffer memory etc. are to be sent;
The MPDU convergence module obtains current A-MPDU maximum message segment length from A-MPDU maximum message segment length adjustment module, and according to current A-MPDU maximum message segment length, the MPDU that MPDU is sent in the buffer memory converges, and obtains the A-MPDU message;
A-MPDU maximum message segment length adjustment module receives the Packet Error Rate of current A-MPDU message, goes up in limited time less than the Packet Error Rate tolerance when said Packet Error Rate, increases current A-MPDU maximum message segment length; Prescribe a time limit down greater than the Packet Error Rate tolerance when said Packet Error Rate, reduce current A-MPUD maximum message segment length; Otherwise, keep current A-MPDU maximum message segment length constant.
Said A-MPDU maximum message segment length adjustment module comprises:
The Packet Error Rate update module; The Packet Error Rate of the current A-MPDU message that the reception physical layer element is sent; According to the Packet Error Rate after the last A-MPDU message renewal; Upgrade the Packet Error Rate of current A-MPDU message, the Packet Error Rate of the current A-MPDU message after upgrading is sent to A-MPDU maximum message segment length update module;
A-MPDU maximum message segment length update module, the Packet Error Rate of the current A-MPDU message that reception Packet Error Rate update module is sent is gone up in limited time less than the Packet Error Rate tolerance when said Packet Error Rate, increases current A-MPDU maximum message segment length; Prescribe a time limit down greater than the Packet Error Rate tolerance when said Packet Error Rate, reduce current A-MPUD maximum message segment length; Otherwise, keep current A-MPDU maximum message segment length constant.
Said A-MPDU maximum message segment length update module comprises:
Comparison module receives the Packet Error Rate of current A-MPDU message, when said Packet Error Rate is gone up in limited time less than the Packet Error Rate tolerance, sends the adjustment indication of the Packet Error Rate that carries current A-MPDU message to adjusting upward module; When said Packet Error Rate is prescribed a time limit down greater than the Packet Error Rate tolerance, send the adjustment indication of the Packet Error Rate that carries current A-MPDU message to downward adjusting module;
Adjust upward module; Receive the adjustment indication; Calculate the Packet Error Rate tolerance upper limit and adjust the difference of indicating the Packet Error Rate that carries, this difference divided by said Packet Error Rate, multiply by preset A-MPDU maximum message segment length with the gained quotient and adjusts upward step-length; With the A-MPDU maximum message segment length addition in gained product and the A-MPDU maximum message segment length memory module, upgrade the A-MPDU maximum message segment length in the A-MPDU maximum message segment length memory module with gained and value;
Downward adjusting module; Receive the adjustment indication; The difference of Packet Error Rate that calculating adjustment indication is carried and Packet Error Rate tolerance lower limit divided by said Packet Error Rate, multiply by this difference preset A-MPDU maximum message segment length with the gained quotient and adjusts step-length downwards; The A-MPDU maximum message segment length of A-MPDU maximum message segment length memory module storage is deducted the gained product, upgrade the A-MPDU maximum message segment length in the A-MPDU maximum message segment length memory module with the gained difference;
A-MPDU maximum message segment length memory module, storage A-MPDU maximum message segment length.
Said A-MPDU maximum message segment length adjustment module is further used for; After increasing current A-MPDU maximum message segment length; Whether the current A-MPDU maximum message segment length after judgement increases is greater than a transmitting-receiving pair A-MPDU maximum message segment length that negotiation obtains; If, with receiving-transmitting sides through the A-MPDU maximum message segment length that obtains as the current A-MPDU maximum message segment length after upgrading; After reducing current A-MPUD maximum message segment length; Whether the current A-MPDU maximum message segment length after judgement reduces is less than A-MPDU maximum message segment length lower limit; If, with A-MPDU maximum message segment length lower limit as the current A-MPDU maximum message segment length after upgrading.
Said A-MPDU maximum message segment length update module comprises:
Comparison module receives the Packet Error Rate of current A-MPDU message, when said Packet Error Rate is gone up in limited time less than the Packet Error Rate tolerance, sends the adjustment indication of the Packet Error Rate that carries current A-MPDU message to adjusting upward module; When said Packet Error Rate is prescribed a time limit down greater than the Packet Error Rate tolerance, send the adjustment indication of the Packet Error Rate that carries current A-MPDU message to downward adjusting module;
Adjust upward module; In advance with 0 and the Packet Error Rate tolerance upper limit between scope division be a plurality of intervals that adjust upward; According to each interval value from small to large; For each interval an A-MPDU maximum message segment length is set with descending order, and the A-MPDU maximum message segment length that is provided with for each is interval A-MPDU maximum message segment length of consulting to obtain less than receiving-transmitting sides, greater than A-MPDU maximum message segment length lower limit; When receiving the adjustment indication of the Packet Error Rate that carries current A-MPDU message that comparison module sends; Confirm the interval that adjusts upward at this Packet Error Rate place, think that the A-MPDU maximum message segment length of this interval setting is upgraded the A-MPDU maximum message segment length in the A-MPDU maximum message segment length memory module;
Downward adjusting module; In advance Packet Error Rate is tolerated that the scope division between lower limit and 100% is that a plurality of downward adjustment are interval; According to each interval value from small to large; For each interval an A-MPDU maximum message segment length is set with descending order, and the A-MPDU maximum message segment length that is provided with for each is interval A-MPDU maximum message segment length of consulting to obtain less than receiving-transmitting sides, greater than A-MPDU maximum message segment length lower limit; When receiving the adjustment indication of the Packet Error Rate that carries current A-MPDU message that comparison module sends; The downward adjustment of confirming this Packet Error Rate place is interval, thinks that the A-MPDU maximum message segment length of this interval setting is upgraded the A-MPDU maximum message segment length in the A-MPDU maximum message segment length memory module;
A-MPDU maximum message segment length memory module, storage A-MPDU maximum message segment length.
This device is arranged in the medium access control MAC unit of transmit leg.
Compared with prior art, the present invention can adjust A-MPDU maximum message segment length in real time according to the Packet Error Rate of A-MPDU message, thereby can make the electromagnetic environment of A-MPDU maximum message segment length and receive-transmit system adapt, and has improved throughput of system; Simultaneously, can reduce MPDU retransmission probability and expense, under the identical situation of throughput, can effectively save channel resource, and reduce and converge operation, effectively save software and hardware resources.
Description of drawings
Fig. 1 is the structural representation of A-MPDU message;
The method flow diagram of the adjustment A-MPDU maximum message segment length that Fig. 2 provides for the embodiment of the invention;
The device composition diagram of the adjustment A-MPDU maximum message segment length that Fig. 3 provides for the embodiment of the invention;
The composition diagram of the A-MPDU maximum message segment length adjustment module that Fig. 4 provides for the embodiment of the invention;
The composition diagram of the A-MPDU maximum message segment length update module that Fig. 5 provides for the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is remake further detailed explanation.
The method flow diagram of the adjustment A-MPDU maximum message segment length that Fig. 2 provides for the embodiment of the invention, as shown in Figure 2, its concrete steps are following:
Step 200: preset Packet Error Rate tolerance upper limit PER
UpWith Packet Error Rate tolerance lower limit PER
Down
Wherein, PER
Up＜PER
DownPER
Up, PER
DownValue can rule of thumb confirm, for example: PER
UpCan be 10%, PER
DownCan be 15%.
Step 201: receiving-transmitting sides is held consultation, and confirms A-MPDU maximum message segment length L
Max
Step 202: transmit leg initialization L
1=L
Max, initialization Packet Error Rate PER
0=0.
Wherein, L
1The maximum message segment length that is adopted when converging first A-MPDU message for transmit leg, the sequence number of the A-MPDU message of the current transmission of subscript 1 expression transmit leg is 1.
Step 203: when transmit leg will send the individual A-MPDU message of k (k is a positive integer, k>=1), transmit leg was according to L
kMPDU to sending in the buffer memory converges, and obtains k A-MPDU message, sends this message.
Step 204: transmit leg sends k the A-MPDU EM end of message, adds up the Packet Error Rate PER of this message
k, and calculate PER
k'=a*PER
k+ (1-a) * PER
K-1'.
Wherein, a is a constant, and 0＜a＜0.5, as: a desirable 1/8.
The work of the Packet Error Rate of accounting message is accomplished by the PHY unit of transmit leg.
Step 205: transmit leg is judged PER
k'＜PER
UpWhether set up, if, execution in step 206; Otherwise, execution in step 207.
Step 206: transmit leg increases L according to preset rules
k, obtain L
K+1, go to and handle k+1 A-MPDU message.
Here, can increase L according to following formula
k, obtain L
K+1:
L
K+1=L
k+ L
Up* (PER
Up-PER
k')/PER
k', wherein, L
UpFor A-MPDU maximum message segment length adjusts upward step-length,, can rule of thumb confirm for preset constant.
Transmit leg obtains L
K+1After, also can judge L
K+1≤L
MaxWhether set up, if do not deal with; Otherwise, make L
K+1=L
Max
Perhaps, in practical application, transmit leg also can be with 0 and PER
UpBetween scope division be the individual interval that adjusts upward of n1 (n1 is preset positive integer, and n1>=2), be respectively [0, PER
S1), [PER
S1, PER
S2), [PER
S2, PER
S3) ..., [PER
S (n-2), PER
S (n-1)], [PER
S (n-1), PER
Up], wherein, 0＜PER
S1＜PER
S2＜PER
S3＜PER
S4...＜PER
S (n-2)＜PER
S (n-1)＜PER
Up, according to L
MinAnd L
MaxFor each interval is provided with an A-MPDU maximum message segment length L
Sm(1≤m≤n1), wherein, [0, PER
S1) corresponding L
S1, [PER
S1, PER
S2) corresponding L
S2, [PER
S2, PER
S3) corresponding L
S3..., [PER
S (n-2), PER
S (n-1)] corresponding L
S (n-1), [PER
S (n-1), PER
Up] corresponding L
Sn, L
Max＞L
S1＞L
S2＞L
S3...＞L
S (n-2)＞L
Sn＞L
MinWherein, L
MinBe preset constant, expression A-MPDU maximum message segment length lower limit can rule of thumb be confirmed L
Min＜L
MaxIn this step, transmit leg can be according to PER
k' find the interval at its place, then should the corresponding L in interval
SmAs L
K+1
Step 207: transmit leg is judged PER
k'＞PER
DownWhether set up, if, execution in step 208; Otherwise, execution in step 209.
Step 208: transmit leg reduces L according to preset rules
k, obtain L
K+1, go to and handle k+1 A-MPDU message.
Here, can reduce L according to following formula
k, obtain L
K+1:
L
K+1=L
k-L
Down* (PER
k'-PER
Down)/PER
k', wherein, L
DownFor A-MPDU maximum message segment length is adjusted step-length downwards,, can rule of thumb confirm for preset constant.
Transmit leg obtains L
K+1After, also can judge L
K+1>=L
MinWhether set up, if do not deal with; Otherwise, make L
K+1=L
Min
Perhaps, in practical application, transmit leg also can be with PER
DownAnd the scope division between 100% is that the individual downward adjustment of n2 (n2 is preset positive integer, and n2>=2) is interval, is respectively [PER
Down, PER
T1), [PER
T1, PER
T2), [PER
T2, PER
T3) ..., [PER
T (n-2), PER
T (n-1)], [PER
T (n-1), 100%], wherein, PER
Down＜PER
T1＜PER
T2＜PER
T3＜PER
T4...＜PER
T (n-2)＜PER
T (n-1)＜100%, according to L
MinAnd L
MaxFor each interval is provided with an A-MPDU maximum message segment length L
Tp(1≤p≤n2), wherein, [PER
Down, PER
T1) corresponding L
T1, [PER
T1, PER
T2) corresponding L
T2, [PER
T2, PER
T3) corresponding L
T3..., [PER
t(n-2), PER
T (n-1)] corresponding L
T (n-1), [PER
T (n-1), 100%] and corresponding L
Tn, L
Max＞L
T1＞L
T2＞L
T3...＞L
T (n-2)＞L
Tn＞L
MinWherein, L
MinBe preset constant, expression A-MPDU maximum message segment length lower limit can rule of thumb be confirmed L
Min＜L
MaxIn this step, transmit leg can be according to PER
k' find the interval at its place, then should the corresponding L in interval
TmAs L
K+1
Step 205～208 are also replaceable to be:
Step 205: transmit leg is judged PER
k'＞PER
DownWhether set up, if, execution in step 206; Otherwise, execution in step 207.
Step 206: transmit leg reduces L according to preset rules
k, obtain L
K+1, go to and handle k+1 A-MPDU message.
Step 207: transmit leg is judged PER
k'＜PER
UpWhether set up, if, execution in step 208; Otherwise, execution in step 209.
Step 208: transmit leg increases L according to preset rules
k, obtain L
K+1, go to and handle k+1 A-MPDU message.
Step 209: transmit leg makes L
K+1=L
k, go to and handle k+1 A-MPDU message.
The device composition diagram of the adjustment A-MPDU maximum message segment length that Fig. 3 provides for the embodiment of the invention, as shown in Figure 3, it mainly comprises: MPDU sends cache module 31, MPDU convergence module 32 and A-MPDU maximum message segment length adjustment module 33, wherein:
MPDU sends cache module 31: the MPDU that buffer memory etc. are to be sent.
MPDU convergence module 32: in the time will sending an A-MPDU message; Obtain current A-MPDU maximum message segment length from A-MPDU maximum message segment length adjustment module 33; According to current A-MPDU maximum message segment length; The MPDU that MPDU is sent in the buffer memory 31 converges, and obtains the A-MPDU message, and the A-MPDU message is sent to the PHY unit.
By the PHY unit A-MPDU message is sent to the recipient.
A-MPDU maximum message segment length adjustment module 33: the A-MPDU maximum message segment length that receiving-transmitting sides is consulted is as initial A-MPDU maximum message segment length; Receive the Packet Error Rate of the current A-MPDU message of sending the PHY unit, go up in limited time less than the Packet Error Rate tolerance, increase current A-MPDU maximum message segment length when said Packet Error Rate; Prescribe a time limit down greater than the Packet Error Rate tolerance when said Packet Error Rate, reduce current A-MPUD maximum message segment length; Otherwise, keep current A-MPDU maximum message segment length constant.
In practical application, as shown in Figure 4, A-MPDU maximum message segment length adjustment module 33 can comprise: Packet Error Rate update module 331 and A-MPDU maximum message segment length update module 332, wherein:
Packet Error Rate update module 331: the Packet Error Rate that receives the current A-MPDU message of sending the PHY unit; Packet Error Rate according to the last A-MPDU message of self record; Upgrade and write down the Packet Error Rate of current A-MPDU message, the Packet Error Rate of the current A-MPDU message after upgrading is sent to A-MPDU maximum message segment length update module 332.
A-MPDU maximum message segment length update module 332: the A-MPDU maximum message segment length that receiving-transmitting sides is consulted is as initial A-MPDU maximum message segment length; The Packet Error Rate of the current A-MPDU message after the renewal that reception Packet Error Rate update module 331 is sent is gone up in limited time less than the Packet Error Rate tolerance when said Packet Error Rate, increases current A-MPDU maximum message segment length; Prescribe a time limit down greater than the Packet Error Rate tolerance when said Packet Error Rate, reduce current A-MPUD maximum message segment length; Otherwise, keep current A-MPDU maximum message segment length constant.
A-MPDU maximum message segment length update module 332 is after increasing current A-MPDU maximum message segment length; Can judge further that whether the current A-MPDU maximum message segment length after the increase consult the A-MPDU maximum message segment length that obtain greater than two the sending out of transmitting-receiving; If the A-MPDU maximum message segment length of receiving-transmitting sides being consulted obtain is as the current A-MPDU maximum message segment length after upgrading; After reducing current A-MPUD maximum message segment length; Can judge further that whether current A-MPDU maximum message segment length after the minimizing is less than A-MPDU maximum message segment length lower limit; If, with A-MPDU maximum message segment length lower limit as the current A-MPDU maximum message segment length after upgrading.
In practical application, as shown in Figure 5, A-MPDU maximum message segment length update module 332 can comprise: comparison module 3321, adjust upward module 3322, downwards adjusting module 3323 and A-MPDU maximum message segment length memory module 3324, wherein:
Comparison module 3321: the Packet Error Rate of the current A-MPDU message after the renewal that reception Packet Error Rate update module 331 is sent; When said Packet Error Rate is gone up in limited time less than the Packet Error Rate tolerance, send the adjustment indication of the Packet Error Rate of the current A-MPDU message after carrying renewal to adjusting upward module 3322; When said Packet Error Rate is prescribed a time limit down greater than the Packet Error Rate tolerance, send the adjustment indication of the Packet Error Rate of the current A-MPDU message after carrying renewal to downward adjusting module 3323.
Adjust upward module 3322: the adjustment indication of the Packet Error Rate that carries the current A-MPDU message after the renewal that receives that comparison module 3321 sends; Calculate the difference of the Packet Error Rate tolerance upper limit and this Packet Error Rate; With this difference divided by this Packet Error Rate; The gained quotient multiply by preset A-MPDU maximum message segment length adjust upward step-length; With the A-MPDU maximum message segment length addition of gained product and 3324 storages of A-MPDU maximum message segment length memory module, upgrade the A-MPDU maximum message segment length in the A-MPDU maximum message segment length memory module 3324 with gained and value.
Perhaps; Adjust upward module 3322: in advance with 0 and the Packet Error Rate tolerance upper limit between scope division be that (n1 is preset positive integer to n1; And n1>=2) the individual interval that adjusts upward; According to each interval value from small to large, for each interval an A-MPDU maximum message segment length L is set with descending order
Sm(1≤m≤n1, and L
Min≤L
Sm≤L
Max); When the adjustment indication of the Packet Error Rate that carries the current A-MPDU message after the renewal that receives that comparison module 3321 sends, confirm the interval that adjusts upward at this Packet Error Rate place, think the L that this interval is provided with
SmUpgrade the A-MPDU maximum message segment length in the A-MPDU maximum message segment length memory module 3324.
Downward adjusting module 3323: the adjustment indication of the Packet Error Rate that carries the current A-MPDU message after the renewal that receives that comparison module 3321 sends; Calculate the difference of this Packet Error Rate and Packet Error Rate tolerance lower limit; With this difference divided by this Packet Error Rate; The gained quotient multiply by preset A-MPDU maximum message segment length adjust step-length downwards; The A-MPDU maximum message segment length of A-MPDU maximum message segment length memory module 3324 storages is deducted the gained product, upgrade the A-MPDU maximum message segment length in the A-MPDU maximum message segment length memory module 3324 with the gained difference.
Perhaps; Downward adjusting module 3323: in advance Packet Error Rate is tolerated that the scope division between lower limit and 100% is that (n2 is preset positive integer to n2; And n2>=2) individual downward adjustment is interval; According to each interval value from small to large, for each interval an A-MPDU maximum message segment length L is set with descending order
Tp(1≤p≤n2, and L
Min≤L
Tp≤L
Max); When the adjustment indication of the Packet Error Rate that carries the current A-MPDU message after the renewal that receives that comparison module 3321 sends, confirm that the downward adjustment at this Packet Error Rate place is interval, think the L of this interval setting
TpUpgrade the A-MPDU maximum message segment length in the A-MPDU maximum message segment length memory module 3324.
A-MPDU maximum message segment length memory module 3324: storage A-MPDU maximum message segment length.
Wherein, MPDU convergence module 32 obtains current A-MPDU maximum message segment length from A-MPDU maximum message segment length memory module 3324.
Device shown in Figure 3 is arranged in the 802.11n MAC unit of transmit leg.
The transmit leg that the present invention mentions can be access point (AP, Access Port), website (STA) etc.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (14)
1. a method of adjusting maximum message segment length is characterized in that, the Packet Error Rate tolerance upper limit and Packet Error Rate tolerance lower limit are set in advance, wherein, the Packet Error Rate tolerance upper limit＜Packet Error Rate tolerance lower limit, this method comprises:
Transmit leg converges the MPDU that sends in the buffer memory according to the current medium access control protocol data cell A-MPDU maximum message segment length that converges, and obtains the A-MPDU message;
Transmit leg sends the A-MPUD message, and transmission finishes, and adds up the Packet Error Rate of this message, goes up in limited time less than the Packet Error Rate tolerance when said Packet Error Rate, increases current A-MPDU maximum message segment length; Prescribe a time limit down greater than the Packet Error Rate tolerance when said Packet Error Rate, reduce current A-MPUD maximum message segment length; Otherwise, keep current A-MPDU maximum message segment length constant.
2. method according to claim 1 is characterized in that, further comprises after the Packet Error Rate of said this message of statistics:
Calculate the product of a and said Packet Error Rate, calculate the product of the Packet Error Rate after the renewal of a 1-a and a last A-MPDU message simultaneously; With this two products addition, upgrade said Packet Error Rate with gained and value, wherein, a is preset constant, and 0＜a＜0.5;
And said Packet Error Rate is less than being limited in the Packet Error Rate tolerance: the Packet Error Rate after the renewal is tolerated the upper limit less than Packet Error Rate;
Said Packet Error Rate is limited to down greater than the Packet Error Rate tolerance: the Packet Error Rate after the renewal is tolerated lower limit greater than Packet Error Rate.
3. method according to claim 2 is characterized in that, the current A-MPDU maximum message segment of said increase length comprises:
The difference of the said Packet Error Rate after calculating the Packet Error Rate tolerance upper limit and upgrading; With this difference divided by the said Packet Error Rate after upgrading; The gained quotient multiply by preset A-MPDU maximum message segment length adjust upward step-length; With gained product and the addition of current A-MPDU maximum message segment length, the current A-MPDU maximum message segment length after obtaining upgrading.
4. method according to claim 3 is characterized in that, further comprises after the said current A-MPDU maximum message segment length after obtaining upgrading:
Whether current A-MPDU maximum message segment length after judge upgrading consult the A-MPDU maximum message segment length that obtain greater than two the sending out of transmitting-receiving, if, with the two A-MPDU maximum message segment length of consulting to obtain sent out of transmitting-receiving as the current A-MPDU maximum message segment length after upgrading.
5. according to claim 2 or 3 described methods, it is characterized in that the current A-MPDU maximum message segment of said minimizing length comprises:
The difference of said Packet Error Rate after calculating is upgraded and Packet Error Rate tolerance lower limit; With this difference divided by the said Packet Error Rate after upgrading; The gained quotient multiply by preset A-MPDU maximum message segment length adjust step-length downwards; Current A-MPDU maximum message segment length is deducted the gained product, the current A-MPDU maximum message segment length after obtaining upgrading.
6. method according to claim 5 is characterized in that, said transmit leg is according to current A-MPDU maximum message segment length, further comprises before converging sending MPDU in the buffer memory:
Preset A-MPDU maximum message segment length lower limit;
Further comprise after the said current A-MPDU maximum message segment length after obtaining upgrading:
Whether the current A-MPDU maximum message segment length after judge upgrading less than A-MPDU maximum message segment length lower limit, if, with A-MPDU maximum message segment length lower limit as the current A-MPDU maximum message segment length after upgrading.
7. method according to claim 1 is characterized in that, said transmit leg is according to current A-MPDU maximum message segment length, further comprises before converging sending MPDU in the buffer memory:
Preset A-MPDU maximum message segment length lower limit; And; With 0 and the Packet Error Rate tolerance upper limit between scope division be a plurality of intervals that adjust upward; According to each interval value from small to large; For each interval an A-MPDU maximum message segment length is set with descending order, and the A-MPDU maximum message segment length that is provided with for each is interval A-MPDU maximum message segment length of consulting to obtain less than receiving-transmitting sides, greater than A-MPDU maximum message segment length lower limit;
The current A-MPDU maximum message segment of said increase length is: confirm the interval that adjusts upward at said Packet Error Rate place, the A-MPDU maximum message segment length that will be provided with for this interval is as the current A-MPDU maximum message segment length after upgrading.
8. method according to claim 1 is characterized in that, said transmit leg is according to current A-MPDU maximum message segment length, further comprises before converging sending MPDU in the buffer memory:
Preset A-MPDU maximum message segment length lower limit; And; Packet Error Rate is tolerated that the scope division between lower limit and 100% is that a plurality of downward adjustment are interval; According to each interval value from small to large; For each interval an A-MPDU maximum message segment length is set with descending order, and the A-MPDU maximum message segment length that is provided with for each is interval A-MPDU maximum message segment length of consulting to obtain less than receiving-transmitting sides, greater than A-MPDU maximum message segment length lower limit;
The current A-MPDU maximum message segment of said minimizing length is: the downward adjustment of confirming said Packet Error Rate place is interval, the current A-MPDU maximum message segment length of the A-MPDU maximum message segment length that will be provided with for this interval after as renewal.
9. a device of adjusting maximum message segment length is characterized in that, this device comprises:
MPDU sends cache module, the MPDU that buffer memory etc. are to be sent;
The MPDU convergence module obtains current A-MPDU maximum message segment length from A-MPDU maximum message segment length adjustment module, and according to current A-MPDU maximum message segment length, the MPDU that MPDU is sent in the buffer memory converges, and obtains the A-MPDU message;
A-MPDU maximum message segment length adjustment module receives the Packet Error Rate of current A-MPDU message, goes up in limited time less than the Packet Error Rate tolerance when said Packet Error Rate, increases current A-MPDU maximum message segment length; Prescribe a time limit down greater than the Packet Error Rate tolerance when said Packet Error Rate, reduce current A-MPUD maximum message segment length; Otherwise, keep current A-MPDU maximum message segment length constant.
10. device according to claim 9 is characterized in that, said A-MPDU maximum message segment length adjustment module comprises:
The Packet Error Rate update module; The Packet Error Rate of the current A-MPDU message that the reception physical layer element is sent; According to the Packet Error Rate after the last A-MPDU message renewal; Upgrade the Packet Error Rate of current A-MPDU message, the Packet Error Rate of the current A-MPDU message after upgrading is sent to A-MPDU maximum message segment length update module;
A-MPDU maximum message segment length update module, the Packet Error Rate of the current A-MPDU message that reception Packet Error Rate update module is sent is gone up in limited time less than the Packet Error Rate tolerance when said Packet Error Rate, increases current A-MPDU maximum message segment length; Prescribe a time limit down greater than the Packet Error Rate tolerance when said Packet Error Rate, reduce current A-MPUD maximum message segment length; Otherwise, keep current A-MPDU maximum message segment length constant.
11., it is characterized in that said A-MPDU maximum message segment length update module comprises according to claim 9 or 10 described devices:
Comparison module receives the Packet Error Rate of current A-MPDU message, when said Packet Error Rate is gone up in limited time less than the Packet Error Rate tolerance, sends the adjustment indication of the Packet Error Rate that carries current A-MPDU message to adjusting upward module; When said Packet Error Rate is prescribed a time limit down greater than the Packet Error Rate tolerance, send the adjustment indication of the Packet Error Rate that carries current A-MPDU message to downward adjusting module;
Adjust upward module; Receive the adjustment indication; Calculate the Packet Error Rate tolerance upper limit and adjust the difference of indicating the Packet Error Rate that carries, this difference divided by said Packet Error Rate, multiply by preset A-MPDU maximum message segment length with the gained quotient and adjusts upward step-length; With the A-MPDU maximum message segment length addition in gained product and the A-MPDU maximum message segment length memory module, upgrade the A-MPDU maximum message segment length in the A-MPDU maximum message segment length memory module with gained and value;
Downward adjusting module; Receive the adjustment indication; The difference of Packet Error Rate that calculating adjustment indication is carried and Packet Error Rate tolerance lower limit divided by said Packet Error Rate, multiply by this difference preset A-MPDU maximum message segment length with the gained quotient and adjusts step-length downwards; The A-MPDU maximum message segment length of A-MPDU maximum message segment length memory module storage is deducted the gained product, upgrade the A-MPDU maximum message segment length in the A-MPDU maximum message segment length memory module with the gained difference;
A-MPDU maximum message segment length memory module, storage A-MPDU maximum message segment length.
12. device according to claim 11; It is characterized in that; Said A-MPDU maximum message segment length adjustment module is further used for, and after increasing current A-MPDU maximum message segment length, whether the current A-MPDU maximum message segment length after judgement increases is greater than receiving and dispatching two A-MPDU maximum message segment length that negotiation obtains of sending out; If, with receiving-transmitting sides through the A-MPDU maximum message segment length that obtains as the current A-MPDU maximum message segment length after upgrading; After reducing current A-MPUD maximum message segment length; Whether the current A-MPDU maximum message segment length after judgement reduces is less than A-MPDU maximum message segment length lower limit; If, with A-MPDU maximum message segment length lower limit as the current A-MPDU maximum message segment length after upgrading.
13., it is characterized in that said A-MPDU maximum message segment length update module comprises according to claim 9 or 10 described devices:
Comparison module receives the Packet Error Rate of current A-MPDU message, when said Packet Error Rate is gone up in limited time less than the Packet Error Rate tolerance, sends the adjustment indication of the Packet Error Rate that carries current A-MPDU message to adjusting upward module; When said Packet Error Rate is prescribed a time limit down greater than the Packet Error Rate tolerance, send the adjustment indication of the Packet Error Rate that carries current A-MPDU message to downward adjusting module;
Adjust upward module; In advance with 0 and the Packet Error Rate tolerance upper limit between scope division be a plurality of intervals that adjust upward; According to each interval value from small to large; For each interval an A-MPDU maximum message segment length is set with descending order, and the A-MPDU maximum message segment length that is provided with for each is interval A-MPDU maximum message segment length of consulting to obtain less than receiving-transmitting sides, greater than A-MPDU maximum message segment length lower limit; When receiving the adjustment indication of the Packet Error Rate that carries current A-MPDU message that comparison module sends; Confirm the interval that adjusts upward at this Packet Error Rate place, think that the A-MPDU maximum message segment length of this interval setting is upgraded the A-MPDU maximum message segment length in the A-MPDU maximum message segment length memory module;
Downward adjusting module; In advance Packet Error Rate is tolerated that the scope division between lower limit and 100% is that a plurality of downward adjustment are interval; According to each interval value from small to large; For each interval an A-MPDU maximum message segment length is set with descending order, and the A-MPDU maximum message segment length that is provided with for each is interval A-MPDU maximum message segment length of consulting to obtain less than receiving-transmitting sides, greater than A-MPDU maximum message segment length lower limit; When receiving the adjustment indication of the Packet Error Rate that carries current A-MPDU message that comparison module sends; The downward adjustment of confirming this Packet Error Rate place is interval, thinks that the A-MPDU maximum message segment length of this interval setting is upgraded the A-MPDU maximum message segment length in the A-MPDU maximum message segment length memory module;
A-MPDU maximum message segment length memory module, storage A-MPDU maximum message segment length.
14. device according to claim 9 is characterized in that, this device is arranged in the medium access control MAC unit of transmit leg.
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