CN110048818B - Feedback information confirmation and processing system and processing method for TID of user - Google Patents
Feedback information confirmation and processing system and processing method for TID of user Download PDFInfo
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- CN110048818B CN110048818B CN201910368122.9A CN201910368122A CN110048818B CN 110048818 B CN110048818 B CN 110048818B CN 201910368122 A CN201910368122 A CN 201910368122A CN 110048818 B CN110048818 B CN 110048818B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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Abstract
The invention belongs to the technical field of information screening, and discloses a system and a method for confirming and processing TID feedback information of a user, wherein a dynamic self-adaptive multi-TID confirmation method is utilized, only the receiving states of a plurality of PDU (protocol data units) in a splicing window are confirmed, and no extra indication is given to the wrong PDU (protocol data unit) after the splicing window; when a plurality of TIDs are transmitted simultaneously, the receiving state of the PDU in the range of a plurality of receiving windows of the TIDs is spliced together at a receiving party for joint feedback, a plurality of different feedback types are adaptively selected for feedback, and the feedback information of the TIDs and the ARQ retransmission information are processed in a unified way. The invention splices the receiving states of the PDU with multiple TIDs of a single user and multiple TIDs of multiple users, can effectively confirm the multiple TIDs, and reduces the feedback overhead as much as possible on the premise of ensuring the indication information to be correct and complete.
Description
Technical Field
The invention belongs to the technical field of information screening processing, and particularly relates to a system and a method for confirming and processing TID feedback information of a user.
Background
Currently, the current state of the art commonly used in the industry is such that:
the next generation WiFi has a large throughput, and to ensure the reliability of data transmission, the 802.11 protocol specifies that an ACK frame must be responded to immediately every time a unicast data frame is received. After receiving the a-MPDU, the receiving end needs to process each MPDU therein, and send an acknowledgement frame for each MPDU. And the Block Ack completes acknowledgement for a plurality of MPDUs by using one Ack frame to reduce the number of Ack frames in this case. It is required to improve the transmission efficiency of the MAC layer by modifying a general transmission mode of one frame-one acknowledgement into a mode of continuously transmitting a plurality of frames and then acknowledging the plurality of frames at a time.
Prior Art
Multi-TID BA: for frame acknowledgement of multiple TIDs, compressed BA bitmap 8 bytes, each MSDU is represented by 1bit, the nth bit in the bitmap is equal to 1, the MSDU of SSC + n is received correctly, otherwise it is wrong.
Multi-STA BA: the RA field of the Multi-STA BA with BA information for multiple AIDs is set to the group address, only a subset of STAs belonging to the group need be indicated, the AID space is further compressed, acknowledgements for multiple TIDs are similar to Multi-TIDBA.
MU-BA: on the basis of multiplexing the Multi-TID, the method is expanded to MU-BA, three response modes, namely ACK, Compressed BA or unompressed BA, are carried in the MU-BA, and the TID is indicated based on bitmap.
The defects of the prior art are as follows: the throughput of the next generation of WiFi is large, many frames need to be confirmed at one time, the confirmation efficiency is high, and in the prior art scheme, aiming at the feedback problem of multiple TIDs, the confirmation efficiency is low, meanwhile, many existing schemes are that the confirmation of multiple TIDs is separately carried out, and then the confirmation is repeated for many times respectively, so that the confirmation of multiple TIDs is realized, the mode needs to feed back for many times, and only a small number of bits carry feedback information in a large number of bits many times, the caused overhead is large, the efficiency is not high, and related requirements are difficult to meet.
In summary, the problems of the prior art are as follows:
(1) in the prior art, the confirmation efficiency is low aiming at the feedback problem of multiple TIDs. The feedback overhead is large.
(2) In the prior art, a plurality of TIDs are confirmed separately and repeatedly, so that the overhead is high and the efficiency is not high.
The difficulty of solving the technical problems is as follows:
the implementation of BA frame redesign, offset division, and adaptive selection of the acknowledgement type solves the significance of the above technical problem:
the scheme can effectively confirm the single-user multi-TID and the multi-user multi-TID, greatly reduces the feedback overhead and can meet the requirement of high throughput of the next generation of Wi-Fi.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a system and a method for confirming and processing TID feedback information of a user. The invention utilizes a dynamic self-adaptive multi-TID confirmation method to confirm the receiving state of a plurality of PDUs in a splicing Window (self-adaptive selection of confirmation types: the invention has 1bit map confirmation and 14 offset confirmation modes, and the confirmation type with the highest confirmation efficiency is selected from the confirmation types to indicate the receiving state of each PDU in the splicing Window, thereby ensuring the maximization of the confirmation efficiency and reducing the confirmation bandwidth expense of a system Depending on the size of the window, the excess is considered invalid. This ensures that the reception status of all PDUs within the concatenation window is indicated. For 15 confirmation modes proposed by the present invention, for each confirmation, each confirmation mode can be tried successively to compare the system overhead, which confirmation mode has the smallest overhead, and which confirmation mode is adopted, and finally, as few REs as possible are used to indicate the PDU receiving state of the whole concatenation window).
The invention is realized in this way, a feedback information confirmation and processing method for TID of user, using dynamic self-adaptive multi-TID confirmation method, only confirming the receiving state of multi PDU in the splicing window, and no extra indication for error receiving PDU after the splicing window;
after default error reception, when multiple TIDs are transmitted simultaneously, the receiving side splices the receiving states of the PDUs within the range of the multiple receiving windows of the multiple TIDs together for joint feedback, adaptively selects a plurality of different feedback types for feedback, and performs unified processing on the feedback information of the multiple TIDs and the ARQ retransmission information.
Further, the dynamic adaptive multiple TID validation method comprises:
acquiring the size of a splicing Window needing to be indicated through an Each Receiving Window Info field, wherein when a plurality of REs are adopted for indication, the indication range of the plurality of REs is not smaller than the size of the splicing Window; when one RE is used for indicating each time, whether all PDUs in the splicing window are indicated needs to be judged, if yes, the RE does not need to be added, and if not, the RE is continuously added until all PDUs in the splicing window are indicated;
the PDU quantity indicated by the last RE exceeds the size of the splicing window, and the exceeding part is invalid; the reception status of all PDUs in the concatenation window is indicated.
Further, the dynamic adaptive multi-TID acknowledgement method further comprises multi-user multi-TID adaptive acknowledgement,
in the BA feedback information field, a plurality of 16-bit REs are contained to indicate the PDU receiving state of each TID of a plurality of users; the feedback type of each RE adaptively selects the feedback type with the highest feedback confirmation efficiency according to the distribution of the receiving states, and all the states are indicated by the fewest REs.
Further, the method for confirming and processing the feedback information of the TID of the user further comprises the following steps:
step one, a plurality of TIDs are received by a plurality of receiving windows of a receiving end;
splicing the receiving states of the PDUs in the TID receiving windows together for unified feedback;
and step three, during confirmation, adaptively selecting the confirmation format with the highest confirmation efficiency from the multiple confirmation formats, and confirming to realize efficient combined feedback of the TIDs.
Further, the method for confirming and processing the feedback information of the TID of the user further comprises the following steps:
firstly, an AP receives MAC PDUs of a plurality of TIDs of a plurality of STAs;
secondly, splicing the receiving states of the PDUs in the receiving windows of the TIDs of the STAs together for unified feedback;
and thirdly, adaptively selecting the acknowledgement format with the highest acknowledgement efficiency from the multiple acknowledgement formats for acknowledgement, and realizing efficient joint feedback of the TIDs of the STAs.
Further, in the third step, the maximum number of the receiving window of each TID is K, the sender simultaneously sends a plurality of TIDs, and the receiving end simultaneously confirms the plurality of received TIDs;
the length of an ith TID effective receiving window is Ni, N1+ N2+ … + Nt is M, the receiving states of M PDUs in total of t TIDs are fed back each time, and a sender retransmits according to the received receiving state feedback;
the number of TIDs is t, the total frame number sent by the ith TID is Mi, wherein i is 1, 2, …, t; and splicing the receiving states of all the TIDs needing to be fed back from SSNi +1 to SSNi + Ni-1 together for confirmation.
Another object of the present invention is to provide a terminal having a processor for implementing the method for confirming and processing the feedback information of the TID of the user.
Another object of the present invention is to provide a computer-readable storage medium, comprising instructions, which when run on a computer, cause the computer to execute the method for feedback information validation and processing of TID of a user.
Another objective of the present invention is to provide a feedback information confirmation and processing system for TID of a user, which adopts 15 indication modes, splices all valid windows, adopts a dynamic adaptive confirmation method, and selects one with the highest confirmation efficiency from the 15 confirmation modes each time until all the spliced windows are indicated;
the feedback information confirmation and processing system for TID of the user comprises:
a plurality of PDU receiving state confirmation modules, which are used for confirming the receiving states of a plurality of PDUs in the splicing window only by utilizing a dynamic self-adaptive multi-TID confirmation method and not additionally indicating the incorrectly received PDUs after the splicing window;
and the information unified processing module is used for unified processing of the multi-TID feedback information and the ARQ retransmission information after the information is not received correctly by default.
Another object of the present invention is to provide a feedback information confirmation and processing system for a TID of a single user, which implements the feedback information confirmation and processing method for a TID of a user, the feedback information confirmation and processing system for a TID of a single user comprising:
the receiving end is used for receiving the TIDs by the receiving windows;
the receiving state splicing module of the single-user PDU is used for splicing the receiving states of the PDUs in the TID receiving windows together and carrying out unified feedback;
and the single-user multi-format confirmation module is used for adaptively selecting the confirmation format with the highest confirmation efficiency from the multi-format confirmation formats during confirmation, confirming and realizing efficient combined feedback of the TIDs.
Another object of the present invention is to provide a feedback information confirmation and processing system for TIDs of multiple users, which implements the feedback information confirmation and processing method for TIDs of users, the system comprising:
an AP for receiving MAC PDUs of a plurality of TIDs of a plurality of STAs;
the receiving state splicing module of the multi-user PDU is used for splicing the receiving states of the PDUs in the receiving windows of the TIDs of the STAs together and carrying out unified feedback;
and the multi-user multi-format confirmation module is used for adaptively selecting the confirmation format with the highest confirmation efficiency from the multi-format confirmation formats during confirmation, and realizing the joint feedback of the TIDs of the STAs.
In summary, the advantages and positive effects of the invention are:
the invention splices the receiving states of the PDU with multiple TIDs of a single user and multiple TIDs of multiple users, can effectively confirm the multiple TIDs, reduces the feedback cost as far as possible on the premise of ensuring the correctness and the integrity of the indication information, and can meet the requirement of large throughput of the next generation of Wi-Fi.
The invention provides a new self-adaptive confirmation mode, which can ensure that the confirmation type with the highest confirmation efficiency is selected, reduce the confirmation overhead of the system as much as possible, realize the high-efficiency combined feedback of a plurality of TIDs, and can be applied to more scenes to realize the flexible confirmation of the plurality of TIDs; the invention is compatible with bitmap and offset for the confirmation of multi-TID state information, and is more efficient and flexible.
Drawings
Fig. 1 is a flowchart of a method for confirming and processing feedback information of a single-user TID according to an embodiment of the present invention.
Fig. 2 is a flowchart of a feedback information confirmation and processing method of multi-user TID according to an embodiment of the present invention.
Figure 3 is a schematic diagram of a multi-TID reception situation provided by the embodiment of the present invention.
Figure 4 is a unified feedback schematic diagram of multiple TIDs provided by the embodiment of the present invention.
Fig. 5 is a schematic diagram of an efficient BA frame format structure provided in the embodiment of the present invention.
Fig. 6 is a schematic diagram illustrating a PDU reception situation in a concatenation window according to an embodiment of the present invention.
Fig. 7 is a diagram illustrating an acknowledgment format according to an embodiment of the invention.
Fig. 8 is a diagram of BA Feedback field types according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the prior art, the confirmation efficiency is low aiming at the feedback problem of multiple TIDs. In the prior art, a plurality of TIDs are confirmed separately and repeatedly, so that the overhead is high and the efficiency is not high.
To solve the above problems, the following description will be made in detail with reference to the accompanying drawings.
The method for confirming and processing the feedback information of the TID of the user provided by the embodiment of the invention,
by utilizing a dynamic self-adaptive multi-TID confirmation method, only the receiving states of a plurality of PDUs in the splicing window are confirmed, and no extra indication is given to the erroneously received PDUs after the splicing window;
after default error reception, when multiple TIDs are transmitted simultaneously, the receiving side splices the receiving states of the PDUs within the range of the multiple receiving windows of the multiple TIDs together for joint feedback, adaptively selects a plurality of different feedback types for feedback, and performs unified processing on the feedback information of the multiple TIDs and the ARQ retransmission information.
Further, the dynamic adaptive multiple TID validation method comprises:
acquiring the size of a splicing Window needing to be indicated through an Each Receiving Window Info field, wherein when a plurality of REs are adopted for indication, the indication range of the plurality of REs is not smaller than the size of the splicing Window; when one RE is used for indicating each time, whether all PDUs in the splicing window are indicated needs to be judged, if yes, the RE does not need to be added, and if not, the RE is continuously added until all PDUs in the splicing window are indicated;
the PDU quantity indicated by the last RE exceeds the size of the splicing window, and the exceeding part is invalid; the reception status of all PDUs in the concatenation window is indicated.
The dynamic adaptive multiple TID acknowledgement method further comprises multi-user multi-TID adaptive acknowledgement,
in the BA feedback information field, a plurality of 16-bit REs are contained to indicate the PDU receiving state of each TID of a plurality of users; the feedback type of each RE adaptively selects the feedback type with the highest feedback confirmation efficiency according to the distribution of the receiving states, and all the states are indicated by the fewest REs.
As shown in fig. 1, the method for confirming and processing feedback information of TID of a single user according to an embodiment of the present invention specifically includes:
s101, a plurality of TIDs are received by a plurality of receiving windows of a receiving end.
S102, splicing the receiving states of the PDUs in the TID receiving windows together for unified feedback.
S103, when confirming, the confirmation format with the highest confirmation efficiency is selected from the multiple confirmation formats in an adaptive mode to confirm, and efficient combined feedback of the TIDs is achieved.
As shown in fig. 2, the method for confirming and processing feedback information of TID of multiple users provided in the embodiment of the present invention specifically includes:
s201, an AP receives MAC PDUs of a plurality of TIDs of a plurality of STAs;
s202, splicing the receiving states of the PDUs in the receiving windows of the TIDs of the STAs together for unified feedback;
s203, adaptively selecting the acknowledgement format with the highest acknowledgement efficiency from the multiple acknowledgement formats for acknowledgement, and implementing efficient joint feedback of multiple TIDs of multiple STAs.
The unified TID feedback provided by the embodiment of the invention specifically comprises the following steps:
the method uses the dynamic self-adaptive multi-TID acknowledgement to confirm the receiving state of only a plurality of PDUs in the splicing window, does not additionally indicate a series of incorrectly received PDUs after the effective receiving window, defaults to incorrectly receive, is not limited to only receiving and confirming a certain TID at one time, but simultaneously confirms the receiving of a plurality of TIDs, and uniformly processes the feedback information of the multi-TID and the information of ARQ retransmission.
The application of the principles of the present invention will now be described in further detail with reference to specific embodiments.
Example 1: adaptive acknowledgement for single user multiple TIDs
The maximum K of the receive window per TID is, the sender simultaneously sends multiple TIDs, and the receiver simultaneously acknowledges the received multiple TIDs, as shown in fig. 3.
The length of the effective receiving window of the ith TID is Ni (the total number of frames from the next frame waiting for receiving to the last correctly received frame), N1+ N2+ … + Nt is M, the receiving state of M PDUs is fed back in total by t TIDs each time, and the sender retransmits according to the received receiving state feedback.
As shown in fig. 4, the number of TIDs is t, and the total number of frames transmitted by the ith (i equals to 1, 2, …, t) TID is Mi, as shown in the green frame; the effective receive window size is Ni, as shown in the blue box, which only needs to be indicated. In order to indicate the receiving state of the receiving state, all the PDU receiving states of the TID which needs to be fed back from SSNi to SSNi + Ni-1 are spliced together and confirmed together. The receiving status of the PDUs containing different TIDs after concatenation is called concatenation window, i.e. the lower blue box in fig. 4.
The efficient BA frame format is shown in fig. 5.
1, the first four fields of the high-efficiency BA are consistent with the definition in 802.11 ax.
2, definitions in B0 to B11 and 802.11ax in BA Control are consistent, B12 to B15 of the present invention carry the number of TIDs to which this BA frame applies, a bitmap or an offset is used to indicate the receipt status of the TIDs, 1110 reserved in BA Type is used to indicate the efficient Multi-TID BA frame of the present invention to indicate Multi-TID feedback, and 1111 indicates the efficient Multi-STA BA frame of the present invention.
3, Each Receiving Window Info: for indicating different TID values and PDU numbers and numbers in the valid Receiving Window, FIG. 6 shows the frame format of the Each Receiving Window Info of Multi-TID BA:
regarding the Each Receiving Window Info, for the Multi-TID BA, because the number of TIDs is 16 at most, a 16-bit Bitmap is adopted for indication, 16 bits of the TID Bitmap from left to right correspond to 16 TID values from small to large, if a certain TID has feedback, the corresponding bit is 1, otherwise, the corresponding bit is 0. For example, when the field is 1111000000000000, it means that there are only 4 TIDs, and the values of the 4 TIDs are 0000, 0001, 0010, and 0011, respectively.
Indicating that SSNi of Each PDU is 16 bits long, and Ni immediately after the SSNi is also 16 bits, wherein the Each ReceivingWindow Info is determined according to the number of TIDs received by a receiving window, and the number of TIDs is indicated in TID/Num TIDs in BA Control. The sequence number field of the data frame in the existing standard is 12 bits, and SSNi and Ni are defined as 16 bits, so that the length of the existing sequence number field can be compatible, and the sequence number can be supported to be expanded to 16 bits at most.
Aiming at the condition that a plurality of TIDs are transmitted simultaneously, the receiving state of the PDU in the range of a plurality of receiving windows of the TIDs is spliced together at a receiving party for joint feedback, and a plurality of different feedback types are adaptively selected for feedback so as to improve the confirmation efficiency.
4, BA Feedback Information: the length is variable and comprises several feedback elements (RE) of length 16 bits. Each RE includes a feedback type, bitmap/offset.
1) The feedback type is as follows: indicating the type of feedback currently employed by the feedback unit. The method mainly comprises the following steps:
bitmap: the frame error distribution is uniform, 0 indicates error, 1 indicates correct
Negative offset: the frame error distribution is sporadic, indicating that the frames among 2 offsets are received correctly, and the frames corresponding to the offsets are received incorrectly, and further divided into 7 negative offsets according to sporadic conditions.
Positive offset: in the frame error distribution set, frame reception errors between 2 offsets are indicated, frames corresponding to the offsets are received correctly, and the frames are divided into 7 positive offsets according to the set condition.
2) Bitmap/offset: indicating PDU reception within a splice window
As shown in fig. 7, in the BA feedback information field, a plurality of 16-bit REs are included to indicate PDU reception statuses of a plurality of TIDs, the feedback type of each RE adaptively selects a feedback type with the highest feedback acknowledgement efficiency according to the distribution of the reception statuses, and all statuses are indicated with as few REs as possible.
The BA Feedback field, single RE, as shown in fig. 8, the first 4 bits are used to distinguish between bitmap and 14 offsets, 15 different acknowledgment types.
① Offset ≠ 0, it indicates the relative shift between two absolute shift points;
② where Offest is 0, it has a special meaning
For negative offsets: indicating correct reception of 2^ k-1 consecutive radio frames starting from the last unacknowledged frame
For a positive offset: indicating 2^ k-1 consecutive radio frame reception errors starting from the last unacknowledged frame
1) Positive offset 1:
4 Offset is all 0, consecutive 7+7+7+7 PDUs indicating the beginning of the first PDU indicated by unused REs within the concatenation window are all received in error
4, 4, 4, indicating that the 4 th, 8, 12, 16 th PDU starting with the first PDU indicated by unused REs within the concatenation window is correctly received, and the 1 st to 3 rd, 5 th to 7 th, 9 th to 11 th, 13 th to 15 th PDU is erroneously received;
2) negative offset 1:
4 Offset is all 0, consecutive 7+7+7+7 PDUs indicating the beginning of the first PDU indicated by unused REs within the concatenation window are all correctly received
4, 4, 4, respectively, indicating that the 4 th, 8 th, 12 th, 16 th PDU starting with the PDU indicated by the first unused RE within the concatenation window was received in error, and the PDUs 1 to 3, 5 to 7, 9 to 11, 13 to 15 were received correctly;
3) positive offset 2:
when all of 3 Offsets are 0, consecutive 15+15+15 PDUs indicating the beginning of the first PDU indicated by unused REs within the concatenation window are all received in error
When the offsets of 3 are respectively 10, 10 and 10, it indicates that the PDU indicated by the first unused RE in the concatenation window starts the correct reception of the 10 th, 20 th and 30 th PDUs and the incorrect reception of the PDUs 1 to 9, 11 to 19 and 21 to 29;
4) negative offset 2:
when all of 3 Offsets are 0, consecutive 15+15+15 PDUs indicating the beginning of the first PDU indicated by unused REs within the concatenation window are all correctly received
When the 3 offsets are 10, 10, 10 respectively, it means that the 10 th, 20 th, 30 th PDUs beginning with the PDU indicated by the first unused RE within the concatenation window are received in error, and the PDUs 1 to 9, 11 to 19, 21 to 29 are received correctly;
5) positive offset 3:
3 Offset is all 0, consecutive 31+15+7 PDUs indicating the beginning of the first PDU indicated by unused REs within the concatenation window are all received in error
3 offsets of 20, 10, 5, respectively, indicate correct reception of the 20 th, 30 th, 35 th PDU starting with the PDU indicated by the first unused RE within the concatenation window, and erroneous reception of the PDUs 1 to 19, 21 to 29, 31 to 34;
6) negative offset 3;
3 Offset is all 0, consecutive 31+15+7 PDUs indicating the beginning of the first PDU indicated by unused REs within the concatenation window are all correctly received
3 offsets of 20, 10, 5 respectively, indicating that the 20 th, 30 th, 35 th PDU of the PDU indicated by the first unused RE in the concatenation window is received in error, and the PDUs 1 to 19, 21 to 29, 31 to 34 are received correctly;
7) positive offset 4:
when all of 3 Offsets are 0, all of the consecutive 7+15+31 PDUs indicating the beginning of the first PDU indicated by the unused RE within the concatenation window are erroneously received
3 offsets of 5, 10, 20 respectively, indicate correct reception of the 5 th, 15 th, 35 th PDU starting with the PDU indicated by the first unused RE within the concatenation window, and erroneous reception of the PDUs 1 to 4, 6 to 14, 16 to 34;
8) negative offset 4:
when all of 3 Offsets are 0, all of the consecutive 7+15+31 PDUs indicating the beginning of the first PDU indicated by the unused RE within the concatenation window are correctly received
3 offsets of 5, 10, 20 respectively, indicating that the 5 th, 15 th, 35 th PDU starting with the PDU indicated by the first unused RE within the concatenation window was received in error, and the PDUs 1 to 4, 6 to 14, 16 to 34 were received correctly;
9) positive offset 5:
2 Offset is all 0, consecutive 63+63 PDUs indicating the beginning of the first PDU indicated by unused REs within the concatenation window are all received in error
2 offsets of 40, 30, respectively, indicating that the 40 th, 70 th PDU starting with the first PDU indicated by unused REs within the concatenation window is correctly received, and the PDUs 1 to 39, 41 to 69 are erroneously received;
10) negative offset 5:
2 Offset is all 0, consecutive 63+63 PDUs indicating the beginning of the first PDU within the concatenation window indicated by unused RE are all correctly received
2 offsets of 40, 30, respectively, indicating that the 40 th, 70 th PDU started with the first PDU indicated with unused REs in the concatenation window was received in error, and the PDUs 1 to 39, 41 to 69 were received correctly;
11) positive offset 6:
2 Offset is 0, consecutive 127+31 PDUs indicating the beginning of the first PDU indicated by unused REs within the concatenation window are all received in error
2 offsets of 60, 20, respectively, indicating correct reception of the 60 th, 80 th PDU starting with the PDU indicated by the first unused RE within the concatenation window, and incorrect reception of the PDUs 1 to 59, 61 to 79;
12) negative offset 6;
2 Offset is 0, consecutive 127+31 PDUs indicating the beginning of the first PDU within the concatenation window indicated by unused REs are all correctly received
2 offsets of 60, 20, respectively, indicating that the 60 th, 80 th PDU starting with the PDU indicated by the first unused RE within the concatenation window was received in error, and the PDUs 1 to 59, 61 to 79 were received correctly;
13) positive offset 7:
1 Offset is all 0, consecutive 4095 PDUs indicating the beginning of the first PDU indicated by unused REs within the concatenation window are all received in error
1 Offset is 2000, indicating that the 2000 th PDU starting with the first PDU indicated by unused REs within the concatenation window is received correctly and the PDUs 1 to 1999 are received in error;
14) negative offset 7;
when 1 Offset is all 0, consecutive 4095 PDUs indicating the beginning of the first PDU indicated by unused REs within the concatenation window are all received correctly
1 Offset is 2000, respectively, indicating that the 2000 th PDU starting with the first PDU indicated by unused REs within the concatenation window was received in error and the PDUs 1 to 1999 were received correctly;
adaptive selection of acknowledgement type: the invention has 1 bitmap confirmation and 14 offset confirmation modes, and selects the confirmation type with the highest confirmation efficiency to indicate the receiving state of each PDU in a splicing window, thereby ensuring the maximization of the confirmation efficiency and reducing the confirmation bandwidth overhead of a system.
The size of the splicing Window needing to be indicated can be known through the Each Receiving Window Info field, when a plurality of REs are adopted for indication, the indication range of the plurality of REs is required to be not smaller than the size of the splicing Window, and meanwhile, the REs are required to be adopted as few as possible. When one RE is used for indicating each time, whether all PDUs in the splicing window are indicated needs to be judged, if yes, the RE does not need to be added, and if not, the RE is continuously added until all PDUs in the splicing window are indicated. The number of PDUs indicated by the last RE may exceed the size of the splicing window, and the excess is considered invalid. This ensures that the reception status of all PDUs within the concatenation window is indicated.
For 15 confirmation modes proposed by the invention, for each confirmation, each confirmation mode can be tried in turn to compare the system overhead, and if the overhead of which confirmation mode is the minimum, which mode is adopted, and finally, as few REs as possible are used to indicate the receiving state of the PDU of the whole splicing window.
Example 2: multi-user multi-TID adaptive acknowledgement
The confirmation principle of multi-user multi-TID and single-user multi-TID of the invention is almost the same as the frame format, and the difference of the frame format of the two is the Each Receiving Window Info and BA Feedback Information field. The Each Receiving Window Info of the Multi-STA BA is used to indicate the received STA information, the Multi-TID value of the Multi-STA, and the PDU number and number, and FIG. 7 is a frame format of the Each Receiving Window Info of the Multi-STA BA.
Regarding the easy Receiving Window Info, for the Multi-STA BA, the AID TIDi Info contains the value of the TID, and supports multiple STAs, so that the information of the AID is also contained. AID Info field, used to indicate information of a certain STA, and the following TID Bitmap is used to indicate information of each TID sent by the STA, and its definition is the same as that of a single user; ni is also consistent with the definition of a single user, and not only the receiving states of the PDUs of the single user with multiple TIDs are spliced, but also the receiving states of the PDUs with multiple users and multiple TIDs are spliced.
In the BA feedback information field, a plurality of 16-bit REs are included to indicate the PDU reception status of each TID of the plurality of users. The feedback type of each RE adaptively selects the feedback type with the highest feedback confirmation efficiency according to the distribution of the receiving states, and all the states are indicated by the fewest REs.
The invention uses dynamic self-adaptive multi-TID confirmation, confirms the receiving state of a plurality of PDUs in a splicing window, does not additionally indicate the PDU of a series of error receiving after an effective receiving window, defaults the error receiving, does not limit to receiving and confirming a certain TID at one time, simultaneously confirms the receiving of a plurality of TIDs, and uniformly processes the feedback information of the multi-TID and the information of ARQ retransmission.
Meanwhile, for the confirmation of the multi-TID state information, the invention is compatible with the relative indication of bitmap and offset, and is more efficient and flexible.
Moreover, the invention is also an adaptive selection confirmation for various confirmation types, and can ensure that the confirmation type with the highest confirmation efficiency is selected and the confirmation overhead of the system is reduced as much as possible.
The invention splices the receiving states of the PDU with multiple TIDs for a single user and multiple TIDs for multiple users, reduces the feedback overhead as much as possible on the premise of ensuring the correctness and the integrity of the indication information, and can meet the requirement of high throughput of the next generation of Wi-Fi.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A method for confirming and processing feedback information of a TID of a user is characterized by comprising the following steps: by utilizing a dynamic self-adaptive multi-TID confirmation method, only the receiving states of a plurality of PDUs in the splicing window are confirmed, and no extra indication is given to the erroneously received PDUs after the splicing window;
after default error reception, when multiple TIDs are transmitted simultaneously, the receiving side splices the receiving states of the PDUs within the range of the multiple receiving windows of the multiple TIDs together for joint feedback, adaptively selects a plurality of different feedback types for feedback, and performs unified processing on the feedback information of the multiple TIDs and the ARQ retransmission information.
2. The method of claim 1 for feedback information validation and processing of a TID of a user, wherein the dynamic adaptive multiple TID validation method comprises:
acquiring the size of a splicing Window needing to be indicated through an Each Receiving Window Info field, wherein when a plurality of REs are adopted for indication, the indication range of the plurality of REs is not smaller than the size of the splicing Window; when one RE is used for indicating each time, whether all PDUs in the splicing window are indicated needs to be judged, if yes, the RE does not need to be added, and if not, the RE is continuously added until all PDUs in the splicing window are indicated;
the PDU quantity indicated by the last RE exceeds the size of the splicing window, and the exceeding part is invalid; the reception status of all PDUs in the concatenation window is indicated.
3. The method of claim 1, wherein the dynamic adaptive multi-TID acknowledgement method further comprises multi-user multi-TID adaptive acknowledgement,
in the BA feedback information field, a plurality of 16-bit REs are contained to indicate the PDU receiving state of each TID of a plurality of users; the feedback type of each RE adaptively selects the feedback type with the highest feedback confirmation efficiency according to the distribution of the receiving states, and all the states are indicated by the fewest REs.
4. The method of claim 1 for feedback information validation and processing of a TID of a user, wherein the method of feedback information validation and processing of a TID of a user further comprises:
step one, a plurality of TIDs are received by a plurality of receiving windows of a receiving end;
splicing the receiving states of the PDUs in the TID receiving windows together for unified feedback;
and step three, during confirmation, adaptively selecting the confirmation format with the highest confirmation efficiency from the multiple confirmation formats, and confirming to realize efficient combined feedback of the TIDs.
5. The method of claim 1 for feedback information validation and processing of a TID of a user, wherein the method of feedback information validation and processing of a TID of a user further comprises:
firstly, an AP receives MAC PDUs of a plurality of TIDs of a plurality of STAs;
secondly, splicing the receiving states of the PDUs in the receiving windows of the TIDs of the STAs together for unified feedback;
and thirdly, adaptively selecting the acknowledgement format with the highest acknowledgement efficiency from the multiple acknowledgement formats for acknowledgement, and realizing efficient joint feedback of the TIDs of the STAs.
6. The method of claim 4, wherein in step three, the maximum of the receiving window of each TID is K, the sender sends multiple TIDs at the same time, and at the receiving end, the multiple TIDs are acknowledged at the same time;
the length of an ith TID effective receiving window is Ni, N1+ N2+ … + Nt is M, the receiving states of M PDUs in total of t TIDs are fed back each time, and a sender retransmits according to the received receiving state feedback;
the number of TIDs is t, the total frame number sent by the ith TID is Mi, wherein i is 1, 2, …, t; and splicing the receiving states of all the TIDs needing to be fed back from SSNi +1 to SSNi + Ni-1 together for confirmation.
7. A terminal, characterized in that the terminal is provided with a processor for realizing the method for confirming and processing the feedback information of TID of the user as claimed in any claim 1-5.
8. A feedback information validation and processing system for a TID of a user implementing the feedback information validation and processing method for a TID of a user of claim 1, wherein the feedback information validation and processing system for a TID of a user comprises:
a plurality of PDU receiving state confirmation modules, which are used for confirming the receiving states of a plurality of PDUs in the splicing window only by utilizing a dynamic self-adaptive multi-TID confirmation method, and no additional indication is given to the wrong PDU receiving after the splicing window;
and the information unified processing module is used for uniformly processing the multi-TID feedback information and the ARQ retransmission information after default error receiving.
9. A feedback information validation and processing system for a TID of a single user implementing the feedback information validation and processing method for a TID of a user of claim 1, wherein the feedback information validation and processing system for a TID of a single user comprises:
the receiving end is used for receiving the TIDs by the receiving windows;
the receiving state splicing module of the single-user PDU is used for splicing the receiving states of the PDUs in the TID receiving windows together and carrying out unified feedback;
and the single-user multi-format confirmation module is used for adaptively selecting the confirmation format with the highest confirmation efficiency from the multi-format confirmation formats during confirmation, confirming and realizing efficient combined feedback of the TIDs.
10. A feedback information validation and processing system for TIDs for multiple users implementing the method of claim 1, wherein the feedback information validation and processing system for TIDs for multiple users comprises:
an AP for receiving MAC PDUs of a plurality of TIDs of a plurality of STAs;
the receiving state splicing module of the multi-user PDU is used for splicing the receiving states of the PDUs in the receiving windows of the TIDs of the STAs together and carrying out unified feedback;
and the multi-user multi-format confirmation module is used for adaptively selecting the confirmation format with the highest confirmation efficiency from the multi-format confirmation formats during confirmation, and realizing the joint feedback of the TIDs of the STAs.
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| CN101179564B (en) * | 2007-08-10 | 2010-12-01 | 华中科技大学 | Link layer automatic request retransmission based TCP packet header compression method and system thereof |
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| EP2849378B1 (en) * | 2008-06-23 | 2018-11-21 | Beijing Xiaomi Mobile Software Co., Ltd. | Method and apparatus for providing acknowledgment bundling |
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