CN1592244A - Hybrid auto-repeating requesting method and apparatus for WLAN - Google Patents
Hybrid auto-repeating requesting method and apparatus for WLAN Download PDFInfo
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- CN1592244A CN1592244A CN 03155673 CN03155673A CN1592244A CN 1592244 A CN1592244 A CN 1592244A CN 03155673 CN03155673 CN 03155673 CN 03155673 A CN03155673 A CN 03155673A CN 1592244 A CN1592244 A CN 1592244A
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- frame
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- satisfies
- repeating transmission
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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
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1835—Buffer management
- H04L1/1845—Combining techniques, e.g. code combining
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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]
- H04L1/1816—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of the same, encoded, message
Abstract
A mixed automatic repeat request method carried out by wireless terminals in wireless LAN includes: (a) receiving a data frame and detecting if the received data frame can meet the requirement of communication quality, (b) if it can't meet the requirement, it is stored, (c) receiving a repeated data frame and selecting a data frame transferring the same content with the said repeated data frame from the stored ones, (d) merging the selected and the repeated data frames to get a data frame meeting the requirement of communication quality.
Description
Technical field
The present invention relates to a kind of mixed automatic retransmission requesting method and device that is used for WLAN (wireless local area network).
Technical background
Wireless lan (wlan) is a kind of data communication system, because it can and receive data by radio wave transmission, minimizing is to the needs of wired connection, the advantage of having mixed data connectivity and user mobility simultaneously, and dispose simple, so it can be widely used in building or the campus as the expansion or the substitute of cable LAN.
WLAN (wireless local area network) be a kind of based on frame (packet) carry out the communication system of transfer of data, it is transmission service reliably that its main performance requires.But the wireless link in the WLAN (wireless local area network) is the mistake that change when relevant with the position takes place very easily and happen suddenly.For the mistake that reduces wireless link to obtain reliable transmission service, in WLAN (wireless local area network), be extensive use of automatic re-send request may (ARQ) method.
Automatically the operation principle of re-send request may (ARQ) is: when Frame receiving from the transmit leg wireless terminal, recipient's wireless terminal is checked the reliability of this Frame by error-checking code (such as cyclic redundancy check (CRC) code (CRC)), that is: whether the Frame that is transmitted satisfies the requirement of communication quality.If this Frame is unreliable, reject this Frame, and require the transmit leg wireless terminal to resend this Frame by feedback channel, perhaps do not send acknowledge message so that it resends this Frame through behind the certain hour to the transmit leg wireless terminal; If this Frame is reliable, recipient's wireless terminal receives this Frame and sends an acknowledge message to the transmit leg wireless terminal.
Fig. 1 is the schematic diagram of automatic re-send request may method to the processing method of Frame.As shown in the figure, at first, recipient's wireless terminal receives Frame 10, the error-checking code (such as cyclic redundancy check (CRC) code (CRC)) that this Frame comprises is carried out verification but the verification failure, so this recipient's wireless terminal is abandoned Frame 10 and require the transmit leg wireless terminal to resend this Frame.Then, this recipient's wireless terminal receives the Frame of retransmitting for the first time 20, its error-checking code that comprises (such as cyclic redundancy check (CRC) code (CRC)) is carried out verification but verification is still failed, and this recipient's wireless terminal is abandoned Frame 20 and is required the transmit leg wireless terminal to resend this Frame once more.At last, this recipient's wireless terminal receives the Frame of retransmitting for the second time 30, and the error-checking code (such as cyclic redundancy check (CRC) code (CRC)) that this Frame comprises is carried out verification, verification succeeds, and this recipient's wireless terminal is accepted Frame 30.
When channel transmission quality is good, require the Frame that retransmits seldom because of unreliable, the valid data amount of transmission is very big in the WLAN (wireless local area network) unit interval, and re-send request may (ARQ) method can guarantee simultaneously that WLAN (wireless local area network) transmits service and very high valid data throughput reliably automatically in this case.When channel transmission quality is very abominable, because of the unreliable Frame that retransmits of requiring a lot, the valid data amount of transmission is very little in the WLAN (wireless local area network) unit interval, automatically re-send request may (ARQ) is transmitted service reliably though method can guarantee WLAN (wireless local area network) in this case, can not provide WLAN (wireless local area network) very high valid data throughput.
For under various channel transmission qualities, WLAN (wireless local area network) can both obtain transmission service reliably and very high valid data throughput, is necessary for WLAN (wireless local area network) and proposes a kind of more advanced automatic re-send request may (ARQ) method.
Summary of the invention
An object of the present invention is to provide a kind of mixed automatic retransmission requesting method and device that is used for WLAN (wireless local area network).In this method and device, keep insecure Frame, and and the Frame of the follow-up transmission same data content of receiving that resends merge by the time split pole and obtain reliable Frame, reduce the quantity of retransmission data frame with this, guarantee when reliable transmission service is provided to WLAN (wireless local area network), can improve the throughput of the valid data of WLAN (wireless local area network) significantly.
According to a kind of mixed automatic retransmission requesting method of in WLAN (wireless local area network), carrying out of the present invention, comprise step by wireless terminal: (a) receiving data frames, and detect the requirement whether Frame of being received satisfies communication quality; (b) if this Frame of receiving does not satisfy the requirement of communication quality, then store this Frame; (c) receive the Frame of a repeating transmission, and from the Frame of storage, select to transmit the Frame of identical content with this retransmission data frame; (d) Frame with the described Frame of selecting and this repeating transmission merges, to obtain a Frame that satisfies the communication quality requirement.
The accompanying drawing summary
Fig. 1 is the schematic diagram of existing automatic re-send request may method to the processing method of Frame;
Fig. 2 is the principle schematic of mixed automatic retransmission requesting method of the present invention;
Fig. 3 is the basic status machine of mixed automatic retransmission requesting method of the present invention;
Fig. 4 is the flow chart of mixed automatic retransmission requesting method of the present invention;
Fig. 5 is a system configuration schematic diagram realizing mixed automatic retransmission requesting method of the present invention.
Detailed Description Of The Invention
The core concept of the mixed automatic retransmission requesting method that the present invention proposes is: preserve insecure Frame of receiving, and the Frame of it and the follow-up transmission same data content of receiving that resends multiplied each other with the corresponding weight coefficient of its reliability with one separately, then each Frame after the weighting is merged (MRC:Maximum Ratio Combining) principle according to high specific, that is: merge the principle of the signal to noise ratio maximum of the Frame obtain, synthetic new reliable Frame.
Fig. 2 is the principle schematic of mixed automatic retransmission requesting method of the present invention.As shown in the figure, for cyclic redundancy check (CRC) code (CRC) verification failed data frame 40 and the Frame of retransmitting for the first time 50 from the transmit leg wireless terminal, recipient's wireless terminal is not abandoned them, but is kept among the buffer T10 with them and with their corresponding separately merge coefficients (being weight coefficient) that calculates according to frame head.Behind the Frame of retransmitting the second time of receiving cyclic redundancy check (CRC) code (CRC) verification failure 60, at first according to the frame head of Frame 60, calculate its corresponding merge coefficient (being weight coefficient), from buffer T10, obtain then Frame 40 and 50 and with their corresponding merge coefficients (being weight coefficient), Frame 40,50 and 60 multiplies each other with their corresponding merge coefficients (being weight coefficient) separately and merges the Frame of an output cyclic redundancy check (CRC) code (CRC) verification succeeds according to the high specific combination principle in high specific merge cells T20 at last.
Fig. 3 is the basic status machine of mixed automatic retransmission requesting method of the present invention.As shown in the figure, the default operating state of mixed automatic retransmission requesting method of the present invention is success status, i.e. A condition.After receiving a Frame, the mixed automatic retransmission requesting method carries out verification to the cyclic redundancy check (CRC) code (CRC) of this Frame, if verification succeeds continues to work under A condition; If the verification failure forwards under the store status and works, promptly under the B state, work.Under the B state, mixed automatic retransmission requesting method storage verification failed data frame is also waited for the Frame that receives repeating transmission; After receiving the Frame of repeating transmission, the verification failed data frame of storage and the described retransmission data frame of receiving be weighted to merge obtain a new merging data frame, if the cyclic redundancy check (CRC) code of this merging data frame (CRC) verification succeeds, the mixed automatic retransmission requesting method returns under the A condition and works; If the cyclic redundancy check (CRC) code of this merging data frame (CRC) verification failure, the mixed automatic retransmission requesting method continues to operate in the B state, preserves the described retransmission data frame of receiving and waits for the next Frame that resends of reception.
Below in conjunction with accompanying drawing 4, be example with the WLAN (wireless local area network) that adopts the IEEE802.11 agreement, describe mixed automatic retransmission requesting method of the present invention in detail.
As shown in the figure, when receiving a Frame, wireless terminal carries out verification (step S10) to the cyclic redundancy check (CRC) code (CRC) that the frame that is included in this Frame detects in sequence (FCS) field, if the CRC check failure then deposits this data frame sequence in the buffer (step S20) in.Wherein in the Frame of being stored, (pilot data (preamble) is a training sequence not comprise the pilot data of this Frame, be used for the estimation of data synchronization and channel), the pilot data part is substituted by channel estimation result, to add temporary as weight coefficient in follow-up this Frame is merged.Except that channel estimation result, also comprise in the Frame of being stored: PLCP head (physical layer convergence protocol head), MAC head (media interviews control head), frame main body and FCS field, PLCP head wherein and MAC head follow-up this Frame is merged to add temporary be used to discern this Frame, the structure of the Frame of storing in the above-mentioned buffer can be referring to accompanying drawing 5.
When receiving the Frame of a new repeating transmission (step 30), wireless terminal is its CRC (step 32) of verification at first, if CRC check failure, then select the Frame (step 35) that has identical transmission content with the Frame of this repeating transmission the Frame in being stored in buffer, and with selected Frame and the current Frame of receiving, corresponding with it respectively weight coefficient multiply each other (step 40), then, to each Frame after the process weighting, the method that adopts high specific to merge (MRC) merges, to obtain a Frame (step 50) that merges through weighting.To the Frame that this merging obtains, wireless terminal carries out CRC check (step 60) once more, if CRC check is still failed, then the Frame of the new repeating transmission that this is received stores in the buffer, and waits for the Frame (step 70) that receives next new repeating transmission; If the CRC check success then in the Frame that this merging of output obtains, is indicated a buffer management unit, selected Frame is deleted (step 80) from buffer.
In above-mentioned mixed automatic retransmission requesting method, adopted channel estimation result as weight coefficient, the Frame of the repeating transmission of being received and the Frame of buffer memory are weighted.Because the channel estimation block is the necessary component of all WLAN terminals, thereby, do not need to increase extra hardware resource and promptly can obtain the needed weight coefficient of mixed automatic retransmission requesting method of the present invention.
In addition, realize that this method does not need existing WLAN (wireless local area network) is done any change, also not needing increases complicated computing unit, only needs to increase the buffer cell of some frames.
For accompanying drawing 4 described mixed automatic retransmission requesting methods, can realize with software module, also can realize with hardware module.When realizing with hardware module, this mixed automatic retransmission request unit comprises: a detecting unit, be used for when receiving a Frame, and the cyclic redundancy check (CRC) code (CRC) that the frame that is included in this Frame detects in sequence (FCS) field is carried out verification; A buffer unit is used for storing this Frame when CRC check is failed; A frame recognition unit is used for when receiving the Frame of a new repeating transmission, selects the Frame that has identical transmission content with the Frame of this repeating transmission the Frame in being stored in buffer; A weighted units is used for selected Frame and the current Frame of receiving, multiplies each other with corresponding weight coefficient respectively; A merge cells is used for adopting the method for high specific merging (MRC) to merge to through each Frame after the weighting, to obtain a Frame that merges through weighting; A buffer management unit is used for when being combined the Frame that obtains when carrying out CRC check and verification succeeds, the above-mentioned Frame of selecting of deletion from buffer.
Fig. 5 shows and uses hardware module to realize a system configuration schematic diagram of mixed automatic retransmission requesting method of the present invention in wireless terminal.As shown in the figure, when wireless terminal is received a Frame, if verification through detecting unit, the frame of this Frame detects cyclic redundancy check (CRC) code (CRC) the verification failure in sequence (FCS) field, then the pilot data of 200 pairs of these Frames of pilot tone evaluation unit carries out the channel estimation to obtain channel estimation result, then channel is estimated that the result replaces the pilot data of this Frame as weight coefficient, this Frame with conversion is kept in the buffer 210 at last.When wireless terminal is received the Frame of a repeating transmission: (1) at first, the pilot data of 200 pairs of these retransmission data frames of pilot tone evaluation unit carries out the channel estimation and obtains channel estimation result, and channel is estimated that the result replaces the pilot data of this Frame as weight coefficient; (2) then, frame recognition unit 220 is from selecting PLCP head and PLCP head and MAC the identical Frame (as in figure dotted arrow L1 and L2 shown in) of MAC head with this retransmission data frame the buffer 210; (3) high specific merge cells 230 multiplies each other with its weight coefficient (shown in dotted arrow L4 among the figure) separately and merges Frame of output according to high specific merging method with the frame of this retransmission data frame and from the frame (shown in dotted arrow L3 among the figure) of the Frame elected the buffer 210 then; (4) last, the Frame that in verification unit 240 this merging is obtained carries out cyclic redundancy check (CRC) code (CRC) verification, if the verification failure, wireless terminal is kept at this retransmission data frame in the buffer 210 and waits for new retransmission data frame; If verification succeeds, wireless terminal are exported the Frame of this merging, and the described Frame of selecting is deleted in indication buffer management unit 250 from buffer 210.
Beneficial effect
In sum, the mixed automatic retransmission requesting method for WLAN of the present invention reaches Device, the insecure Frame that receives by preservation, and make it and follow-up receiving again The Frame of the transmission same data content that sends makes up according to certain rule that obtain can The Frame that leans on has reached minimizing retransmission data number of frames with this, guarantees giving WLAN When reliable transmission service is provided, improve significantly the valid data of WLAN The purpose of handling capacity. Simultaneously, realize that this device does not need to do any to existing WLAN Change. In addition, this device does not need to increase complicated computing unit, only increases some frames Buffer unit.
It will be appreciated by those skilled in the art that disclosed in this invention for WLAN from Moving retransmission request method and device can be made various on the basis that does not break away from content of the present invention Improve. Therefore, protection scope of the present invention should be determined by the content of appending claims.
Claims (13)
1, a kind of mixed automatic retransmission requesting method of being carried out by wireless terminal in WLAN (wireless local area network) comprises step:
(a) receiving data frames, and detect the requirement whether Frame of being received satisfies communication quality;
(b) if this Frame of receiving does not satisfy the requirement of communication quality, then store this Frame;
(c) receive the Frame of a repeating transmission, and from the Frame of storage, select to transmit the Frame of identical content with this retransmission data frame;
(d) Frame with the described Frame of selecting and this repeating transmission merges, to obtain a Frame that satisfies the communication quality requirement.
2, the method for claim 1 also comprises step:
(e) detect the requirement whether Frame that merges satisfies communication quality;
(f) if the Frame that merges does not satisfy the requirement of communication quality, then store the Frame of described repeating transmission.
3, method as claimed in claim 2 also comprises step:
(g) if the Frame that merges satisfies the requirement of communication quality, then delete the described Frame of selecting.
4, as any described method of claim in the claim 1 to 3, wherein step (d) comprising:
(i) Frame with described Frame of selecting and repeating transmission multiplies each other with the weight coefficient of estimating respectively;
(ii) the described Frame of selecting after the weighting and the Frame of the repeating transmission after the weighting are merged, to obtain a Frame that satisfies the communication quality requirement.
5, method as claimed in claim 4, wherein said weight coefficient are to obtain according to the information relevant with the Frame delivery quality that comprises in the Frame.
6, method as claimed in claim 5, wherein said weight coefficient are the channel estimation results who calculates according to the pilot data in the Frame.
7, method as claimed in claim 4, what merging method wherein adopted is high specific merging method.
8, as any described method of claim in the claim 1 to 3, wherein the Frame of being stored comprises Frame identifying information and the information relevant with the Frame delivery quality at least.
9, a kind of wireless terminal that can carry out the mixed automatic retransmission requesting method comprises:
A receiving element is used for receiving data frames;
A detecting unit is used to detect the requirement whether Frame of being received satisfies communication quality;
A memory cell is used for storing this Frame when this Frame of receiving does not satisfy requiring of communication quality;
A frame recognition unit is used for from the Frame selection of storage and the Frame of the Frame transmission identical content of the repeating transmission of receiving;
A merge cells is used for the Frame of the described Frame of selecting and this repeating transmission is merged, to obtain a Frame that satisfies the communication quality requirement.
10, wireless terminal as claimed in claim 9 also comprises:
A control unit is used for deleting the described Frame of selecting when the Frame that merges satisfies requiring of communication quality.
11, as claim 9 or 10 described wireless terminals, wherein said merge cells also comprises:
A weighted units is used for the Frame of described Frame of selecting and repeating transmission is multiplied each other with the weight coefficient of estimating respectively.
12, wireless terminal as claimed in claim 11, wherein said weight coefficient are the channel estimation results who calculates according to the pilot data in the Frame.
13, as claim 9 or 10 described wireless terminals, wherein the Frame of being stored comprises Frame identifying information and the information relevant with the Frame delivery quality at least.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03155673 CN1592244A (en) | 2003-09-02 | 2003-09-02 | Hybrid auto-repeating requesting method and apparatus for WLAN |
| PCT/IB2004/051647 WO2005022818A1 (en) | 2003-09-02 | 2004-09-01 | A hybrid arq method and apparatus for use in wlan |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 03155673 CN1592244A (en) | 2003-09-02 | 2003-09-02 | Hybrid auto-repeating requesting method and apparatus for WLAN |
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| CN1592244A true CN1592244A (en) | 2005-03-09 |
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| CN 03155673 Pending CN1592244A (en) | 2003-09-02 | 2003-09-02 | Hybrid auto-repeating requesting method and apparatus for WLAN |
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| WO (1) | WO2005022818A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100452740C (en) * | 2006-07-28 | 2009-01-14 | 清华大学 | Method for speech communicating in radio local network |
| CN102594535A (en) * | 2012-02-24 | 2012-07-18 | 华为技术有限公司 | Adaptive weighted HARQ (hybrid automatic repeat request) combination method and device |
| CN101584144B (en) * | 2007-01-16 | 2013-02-06 | 皇家飞利浦电子股份有限公司 | System and method for efficient transmission of multimedia and data |
| WO2015124089A1 (en) * | 2014-02-18 | 2015-08-27 | Huawei Technologies Co., Ltd. | Harq frame data structure and method of transmitting and receiving with harq in systems using blind detection |
| CN115361103A (en) * | 2022-08-18 | 2022-11-18 | 陈冠宇 | Buffer management mechanism for select-repeat hybrid automatic repeat request protocol |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8004992B2 (en) | 2008-03-03 | 2011-08-23 | Qualcomm Incorporated | Adding hybrid ARQ to WLAN protocols with MAC based feedback |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI103540B (en) * | 1997-04-28 | 1999-07-15 | Nokia Mobile Phones Ltd | A method for transferring packet switched data from a mobile system |
| JP4330767B2 (en) * | 2000-06-26 | 2009-09-16 | 株式会社エヌ・ティ・ティ・ドコモ | Communication method and base station apparatus performing automatic retransmission request |
| DE10125908A1 (en) * | 2001-05-28 | 2002-12-12 | Infineon Technologies Ag | Mobile radio receiver for receiving data packets over mobile radio channel has incremental redundancy for mobile radio reception |
-
2003
- 2003-09-02 CN CN 03155673 patent/CN1592244A/en active Pending
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2004
- 2004-09-01 WO PCT/IB2004/051647 patent/WO2005022818A1/en active Application Filing
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100452740C (en) * | 2006-07-28 | 2009-01-14 | 清华大学 | Method for speech communicating in radio local network |
| CN101584144B (en) * | 2007-01-16 | 2013-02-06 | 皇家飞利浦电子股份有限公司 | System and method for efficient transmission of multimedia and data |
| CN102594535A (en) * | 2012-02-24 | 2012-07-18 | 华为技术有限公司 | Adaptive weighted HARQ (hybrid automatic repeat request) combination method and device |
| WO2015124089A1 (en) * | 2014-02-18 | 2015-08-27 | Huawei Technologies Co., Ltd. | Harq frame data structure and method of transmitting and receiving with harq in systems using blind detection |
| US9369241B2 (en) | 2014-02-18 | 2016-06-14 | Huawei Technologies Co., Ltd. | HARQ frame data structure and method of transmitting and receiving with HARQ in systems using blind detection |
| US10212613B2 (en) | 2014-02-18 | 2019-02-19 | Huawei Technologies Co., Ltd. | HARQ frame data structure and method of transmitting and receiving with HARQ in systems using blind detection |
| US10631179B2 (en) | 2014-02-18 | 2020-04-21 | Huawei Technologies Co., Ltd. | HARQ frame data structure and method of transmitting and receiving with HARQ in systems using blind detection |
| CN115361103A (en) * | 2022-08-18 | 2022-11-18 | 陈冠宇 | Buffer management mechanism for select-repeat hybrid automatic repeat request protocol |
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| Publication number | Publication date |
|---|---|
| WO2005022818A1 (en) | 2005-03-10 |
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