CN1332540A - AZHARQ algorithm - Google Patents

AZHARQ algorithm Download PDF

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Publication number
CN1332540A
CN1332540A CN01130854A CN01130854A CN1332540A CN 1332540 A CN1332540 A CN 1332540A CN 01130854 A CN01130854 A CN 01130854A CN 01130854 A CN01130854 A CN 01130854A CN 1332540 A CN1332540 A CN 1332540A
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Prior art keywords
ack
transmitting terminal
nak
modulation
channel
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CN01130854A
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Chinese (zh)
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杨鸿文
杨大成
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Individual
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Priority to CN01130854A priority Critical patent/CN1332540A/en
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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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/63—Joint error correction and other techniques
    • H03M13/6306—Error control coding in combination with Automatic Repeat reQuest [ARQ] and diversity transmission, e.g. coding schemes for the multiple transmission of the same information or the transmission of incremental redundancy

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention is an adaptive mixed ARQ scheme of applying radio or wired channel to ensure information transmission quality. ACK/NAK based information is used to reflect the quality of channel, and one method of adaptive control of encoding and modulation is designed. The ACK/NAK state is counted at the sending end and the sending modulation and encoding mode is regulated in step mode. The present invention has excellent adaptability to the change of channel and no complex channel estimation and feedback of the estimated value, and is also superior to AMC+HARQ scheme in data thuoughput.

Description

The A2HARQ algorithm
The present invention relates to a kind of hybrid ARQ transmission technology that adopts adaptive technique.
In order in time-variant wireless channel, to improve efficiency of transmission as far as possible, farthest to improve the effective rate of information throughput, comprise many motions of 3GPP and 3GPP2 technical proposal, document " R1-01-0430 TR 25.848v0.6.0.; 2001 " for example, all adopted adaptive modulation/coding (AMC) and hybrid ARQ (H-ARQ) technology to improve transmission performance among " Min Goo Kim; Enhanced Throughput with Hybrid ARQ; Samsung l xEV-DV Proposal; 2000 " and " the High Speed Downlink Packet Access; Motorola, 2000 ".
Main points of these motions are to utilize channel information (normally C/I estimated value) to determine modulation/coding mode (AMC) best at transmitting terminal.Because the error that C/I estimates is inevitably, so the AMC technology generally can not be operated under the optimal mode.In order to address this problem expeditiously, the related advisory in the 3G (Third Generation) Moblie technical scheme has adopted the H-ARQ notion again.Can regard AMC as coarse regulation like this, H-ARQ regards fine control as.Be subjected to the restriction of C/I estimated accuracy, the adjustment to transmission mode in each technical scheme is to adjust slowly, and high-speed data service supposes that also channel variation speed is very slow simultaneously, to guarantee that the C/I evaluated error is in the acceptable scope.
The estimation of C/I is generally carried out at receiving terminal.Receiving terminal need estimate current C and I earlier, dopes the C/I of future (next sending time slots) then, the result is sent to make a start again.Evaluated error derives from the deviation of estimating C and estimating I, the error of prediction C/I and the mistake of feedback channel.It is generally acknowledged that even if under fabulous condition (very high signal to noise ratio, extremely slow decline), the standard deviation of the error of the C/I known to making a start also can not be better than 1dB.Look the difference of concrete condition, standard deviation reach 3～4dB so that higher all be normal condition.
We notice, have adopted ARQ to mean that transmitting terminal necessarily can observe ACK/NAK.Concerning transmitting terminal, no matter be the fine or not degree that C/I or ACK/NAK can both reflect channel, so C/I may be inessential concerning transmitting terminal.In fact, the information that can obtain from C/I also can draw by analyzing ACK/NAK.From this point, the present invention proposes adaptive H-ARQ based on ACK/NAK (brief note is A2HARQ, ACK/NAK based Adaptive H-ARQ) and in conjunction with the scheduling of resource of A2HARQ.Adopt this technology the complexity of simplified system realization greatly also to be improved effectively the performance of system in 3-G (Generation Three mobile communication system) or in other high-speed data service.
The A2HARQ algorithm that the present invention proposes is determined the sending mode of each packet to comprise coded system and modulation system according to retransmission of information adaptively.This algorithm is independently carried out at each user at transmitting terminal.It below is the mathematical description of this algorithm.
Note integer set omega=1,2 ..., M} is the set of operable transmission mode of making a start, any one m ∈ Ω has stipulated a kind of coded system (comprising encoding rate and frame length) and modulation system.Note m i∈ Ω is the transmission mode that adopts when sending i packet, N iFor successfully sending i the transmission number of times that packet is required.Definition real variable x i∈ R also is called pattern control variables when sending i packet, defines function f: a R → Ω again and is Wherein [-] is rounding operation.So by (1), initial examination value x 0∈ R, m 0∈ Ω and following recursive algorithm have been determined the A2HARQ algorithm jointly. 0＜Δ in the formula＜1 is pattern control step-length.
Accompanying drawing the 1, the 2nd, the realization block diagram of algorithm.Accompanying drawing 3,4 shows the simulation performance of A2HARQ.
Simulated conditions is reference substantially with 1xEV-DV.Table 1 is the mode of operation table that uses in the emulation.Channel spacing is 1.25MHz.The length of the basic time slot of physical layer is 1.25ms.Channel model is that gain Rayleigh model is waited in 3 footpaths, and the Doppler frequency-shift in every footpath is f dReceiving terminal adopts desirable diversity.The ACK/NAK return span is 5ms.
Simulation result shows, A2HARQ can adapt to the different rapidities of fading.The slow more then performance that declines is good more, the decreased performance when rapidity of fading accelerates.At f dA under the=5Hz condition 2The performance of HARQ is equivalent to C/I and estimates that average does not have partially, the performance of the AMC-HARQ when standard deviation is 2dB compares.And will reach such evaluated error in the middle of actual suitable difficulty is arranged.
The pattern list that table 1 emulation is used
Pattern Encoding rate Turbo code frame length (bits) Code word long (bits) Modulation Physics frame length (Symbols) Peak rate (Mbps)
????1 ????1/3 ????512 ????1536 ?QPSK ????768 ????0.82
????2 ????1/2 ????768 ????1536 ?QPSK ????768 ????1.23
????3 ????2/3 ????1024 ????2304 ?QPSK ????768 ????1.64
????4 ????1/2 ????1152 ????2304 ?8PSK ????768 ????1.84
????5 ????1/2 ????1536 ????3072 ?16QAM ????768 ????2.46
????6 ????2/3 ????2048 ????3072 ?16QAM ????768 ????3.28

Claims (4)

1. an adaptive hybrid arq algorithms is included in the various transmission systems, utilizes the coding and the modulation system of ACK/NAK information self-adapting ground control transmitting terminal, to obtain the high channel utilance.
2. described in claim 1, utilize ACK/NAK information self-adapting ground control transmitting terminal ground coding and modulation system, it is characterized in that: completely or partially utilized the ACK/NAK information of feeding back from receiving end during the parameter of transmitting terminal decision coding, modulation.
3. various transmission systems described in claim 1, comprise wireless, wired mode various point-to-points, put multiple spot, multiple spot to multiple spot, single user system, multi-user system.
4. the ACK described in claim 1, NAK, it is defined as follows: ACK representative feeds back to the signal that the affirmation packet of transmitting terminal is correctly received by receiving terminal, NAK representative feeds back to the signal that the packet of transmitting terminal is not correctly received by receiving terminal, or transmitting terminal is not received ACK in the time of subscribing.
CN01130854A 2001-08-28 2001-08-28 AZHARQ algorithm Pending CN1332540A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN01130854A CN1332540A (en) 2001-08-28 2001-08-28 AZHARQ algorithm

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Application Number Priority Date Filing Date Title
CN01130854A CN1332540A (en) 2001-08-28 2001-08-28 AZHARQ algorithm

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CN1332540A true CN1332540A (en) 2002-01-23

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100380831C (en) * 2003-09-23 2008-04-09 四川大学 Digital modulation-demodulation method for safe information transmission
CN1780198B (en) * 2004-11-17 2010-04-14 北京三星通信技术研究有限公司 Method for discriminating data packet coding and decoding style by decoding end
CN1781274B (en) * 2003-04-25 2010-04-28 摩托罗拉公司(在特拉华州注册的公司) Method and apparatus for channel quality feedback within a communication system
CN1853380B (en) * 2003-02-19 2011-01-19 高通股份有限公司 Efficient automatic repeat request methods and apparatus
US8074140B2 (en) 2002-02-13 2011-12-06 Interdigital Technology Corporation User equipment using hybrid automatic repeat request
US8086270B2 (en) 2004-09-06 2011-12-27 Panasonic Corporation Classifying-synthesizing transmission method of multi-user feedback information at base station
CN101588229B (en) * 2008-05-23 2013-04-10 电信科学技术研究院 Method and system for estimating link quality in system by adopting automatic hybrid repeat
CN113711514A (en) * 2019-04-23 2021-11-26 松下电器（美国）知识产权公司 Base station, terminal and communication method

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8341482B2 (en) 2002-02-13 2012-12-25 Intel Corporation User equipment using hybrid automatic repeat request
CN102497258B (en) * 2002-02-13 2015-11-18 英特尔公司 Subscriber equipment and base station
US10230488B2 (en) 2002-02-13 2019-03-12 Intel Corporation User equipment using hybrid automatic repeat request
US9344252B2 (en) 2002-02-13 2016-05-17 Intel Corporation User equipment using hybrid automatic repeat request
CN101662349B (en) * 2002-02-13 2013-03-27 英特尔公司 Transport block set transmission using hybrid automatic repeat request
CN102497257B (en) * 2002-02-13 2015-11-18 英特尔公司 For the subscriber equipment that receives and the method for receiving radio communication
CN1633676B (en) * 2002-02-13 2012-03-28 美商内数位科技公司 Transport block set transmission using hybrid automatic repeat request
CN102571306B (en) * 2002-02-13 2015-07-29 英特尔公司 Base station and method
CN102571306A (en) * 2002-02-13 2012-07-11 美商内数位科技公司 Base station and method
US8074140B2 (en) 2002-02-13 2011-12-06 Interdigital Technology Corporation User equipment using hybrid automatic repeat request
CN1853380B (en) * 2003-02-19 2011-01-19 高通股份有限公司 Efficient automatic repeat request methods and apparatus
CN1781274B (en) * 2003-04-25 2010-04-28 摩托罗拉公司(在特拉华州注册的公司) Method and apparatus for channel quality feedback within a communication system
CN100380831C (en) * 2003-09-23 2008-04-09 四川大学 Digital modulation-demodulation method for safe information transmission
US8086270B2 (en) 2004-09-06 2011-12-27 Panasonic Corporation Classifying-synthesizing transmission method of multi-user feedback information at base station
CN1780198B (en) * 2004-11-17 2010-04-14 北京三星通信技术研究有限公司 Method for discriminating data packet coding and decoding style by decoding end
CN101588229B (en) * 2008-05-23 2013-04-10 电信科学技术研究院 Method and system for estimating link quality in system by adopting automatic hybrid repeat
CN113711514A (en) * 2019-04-23 2021-11-26 松下电器（美国）知识产权公司 Base station, terminal and communication method

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