CN102255709B - Data repeating method, base station, terminal and wireless communication system - Google Patents

Data repeating method, base station, terminal and wireless communication system Download PDF

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Publication number
CN102255709B
CN102255709B CN201010184280.8A CN201010184280A CN102255709B CN 102255709 B CN102255709 B CN 102255709B CN 201010184280 A CN201010184280 A CN 201010184280A CN 102255709 B CN102255709 B CN 102255709B
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retransmission
retransmit interval
base station
frame
interval
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CN102255709A (en
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宁丁
关艳峰
鲁照华
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2010/077847 priority patent/WO2011143895A1/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
    • H04L1/12—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]
    • 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
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H04L1/0029—Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling
    • 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
    • H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
    • 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
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/188—Time-out mechanisms

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

Abstract

The invention discloses a kind of data repeating method, base station, terminal and wireless communication system.Wherein, a kind of described data repeating method comprises: base station arranges HARQ maximum retransmit interval according to retransmission parameter, and described retransmission parameter comprises frame structure and/or the maximum retransmission of Frame; The control channel signaling sent on a control channel is determined in described base station according to described HARQ maximum retransmit interval, described control channel signaling comprises retransmit interval indication information; Described base station sends described retransmission parameter and described control channel signaling to terminal; Described terminal determines described HARQ maximum retransmit interval according to described retransmission parameter and control channel signaling; Described terminal and described base station are according to described HARQ maximum retransmit interval retransmission data packet may.By the present invention, base station and terminal, when carrying out data re-transmission, can be known the maximum retransmit interval of HARQ, effectively save signaling consumption by signalling.

Description

Data repeating method, base station, terminal and wireless communication system
Technical field
The present invention relates to the communications field, in particular to a kind of hybrid automatic repeat-request (HybridAutomaticRepeatRequest, referred to as HARQ) data repeating method, base station, terminal and wireless communication system.
Background technology
Hybrid automatic repeat-request (HybridAutomaticRepeatRequest, referred to as HARQ) technology is the improvement to traditional automatic retransmission request (AutomaticRepeatRequest, referred to as ARQ) technology.HARQ combine with technique ARQ technology and forward error correction (FEC) technology, and then reduce time-varying fading channels to the impact receiving error rates of data, enable wireless communication system provide higher more stable data throughput.
The working mechanism of HARQ is that transmitting terminal sends a data A and wraps to receiving terminal, and after receiving terminal decoding, feeding back ACK or NACK are to transmitting terminal, and ACK represents successfully decoded, and NACK represents and decodes unsuccessfully.If transmitting terminal receives NACK can retransmit a packet B, packet A with B may be different, and then receiving terminal is decoded jointly according to packet A and B that twice receives.If continue unsuccessful, transmitting terminal can send packet always until successfully decoded or number of retransmissions reach maximum retransmission N_MAX_ReTx.Wherein maximum retransmission N_MAX_ReTx comprises again descending maximum retransmission DL_N_MAX_ReTx and up maximum retransmission UL_N_MAX_ReTx two kinds.
In Frequency Division Duplexing (FDD) (FrequencyDivisionDuplex, referred to as FDD) system, uplink/downlink can transmit data or signal simultaneously.In order to reduce the system delay because system link structure causes, and the data load on flexible allocation uplink/downlink, be the subframe that multiple time granularity is less by a radio frames Further Division usually.Wherein, the number of sub frames (i.e. time span) shared by a packet is TTI (TransmissionTimeInterval, Transmission Time Interval).Such as, in the wireless frame structure shown in Fig. 1, a radio frames is divided into 8 subframes, the principle increased progressively in order, carries out serial number to all radio frames, is called for short frame number, as shown in Figure 1,8 subframes are expressed as SF0-SF7, and wherein, up link and down link have identical frame structure.
At time division duplex (TimeDivisionDuplex, referred to as TDD) in system, for based on OFDM (OrthogonalFrequencyDivisionMultiplexing, OFDM) or OFDMA (OrthogonalFrequencyDivisionMultipleAccess, OFDM) wireless communication system, its Radio Resource maps frame structure and the resource structures of this wireless communication system of Main Basis, frame structure describes the control structure of Radio Resource in time domain, and resource structures describes the control structure of Radio Resource on frequency domain.Radio Resource is divided into the unit of different brackets by frame structure in time domain, as superframe (Superframe), frame (Frame), subframe (Subframe) and symbol (Symbol), scheduling controlling is realized by arranging different control channels (such as, broadcast channel, clean culture and Multicast Channel etc.).
Such as, as shown in Figure 2, Radio Resource is divided into superframe in time domain, each superframe comprises 4 frames, each frame comprises 8 subframes, subframe is made up of 6 basic OFDMA symbol, specifically comprises how many OFDMA symbol in the factor determination frame structures such as the circulating prefix-length of the bandwidth that real system is supported as required and/or OFDMA symbol in each grade unit.Wherein can comprise several descending sub frames and sub-frame of uplink in each frame, the packet sent at descending sub frame sends to terminal by base station, and terminal carries out HARQ feedback by sub-frame of uplink again; Equally, the packet sent at sub-frame of uplink sends to base station by terminal, and HARQ feedback is carried out by descending sub frame again in base station.
Along with frequency resource is day by day rare, base station needs to support multiple different bandwidth (such as, 5MHz, 10MHz or 20MHz, system bandwidth is also known as bandwidth sometimes) or multi-carrier operation, to utilize different frequency resources and to meet the demand of different operators.It should be noted that, (such as micro-wave access to global intercommunication (WorldwideInteroperabilityforMicrowaveAccess in some OFDM or OFDMA communication system, referred to as Wimax) 16m communication system), fast fourier transform (the FastFourierTransformation of bandwidth sum system, referred to as FFT) counting exists relation one to one, that is, only know the bandwidth of system, just can the FFT of certainty annuity count.
In descending HARQ retransmission processes, packet is sent to terminal by base station, and terminal sends ACK/NACK at a fixed time, if and base station receives is that NACK represents last transmission not success, if now number of retransmissions does not also reach the maximum retransmission that system allows, base station must send the retransmission packet of this packet to terminal.Due in some communication system, as Wimax16m communication system, the time retransmitting this retransmission packet is not completely fixed, but by the situation flexible dispatching of base station according to oneself, and re-transmission in notification terminal, so there is a time interval between twice transmission.Due to the needs of communication system and HARQ mechanism, base station and terminal all must know the maximum occurrences in the time interval, or claim HARQ maximum retransmit interval MAX_Interval.This parameter maximum occurrences can at broadcast channel (superframe header) and A-MAP (AdvancedMAP, business control channel) middle notice, also can send in other control channels are as AAI_SCD (AdvancedAirInterfaceSystemConfigurationDescriptor, advanced air interface system configuration describes).As a same reason, in some communication system, the re-transmission time of ascending HARQ is not also fixed, and also needs a parameter UL_MAX_Interval, and allows base station and terminal all know the value of this parameter.
In correlation technique, when using control channel to send parameter MAX_Interval (the maximum retransmit time interval), the signaling sent in control channel is binary bits number, and the corresponding relation of binary number and concrete time is uncertain, therefore also need to use extra signaling clearly to inform the exact numerical values recited of this parameter of terminal.The problem that the signaling consumption in the maximum retransmit time interval is large is notified when causing HARQ to retransmit thus.
Summary of the invention
Main purpose of the present invention is to provide a kind of data repeating method, base station, terminal and wireless communication system, during to solve above-mentioned HARQ re-transmission, notifies the problem that the signaling consumption in the maximum retransmit time interval is large.
According to an aspect of the present invention, provide a kind of data repeating method, comprising: base station arranges HARQ maximum retransmit interval according to retransmission parameter, described retransmission parameter comprises frame structure and/or the maximum retransmission of Frame; The control channel signaling sent on a control channel is determined in base station according to HARQ maximum retransmit interval, this control channel signaling comprises retransmit interval indication information; Base station transmission retransmission parameter and control channel signaling are to terminal; Terminal determines HARQ maximum retransmit interval according to retransmission parameter and control channel signaling; Terminal and base station are according to HARQ maximum retransmit interval retransmission data packet may.
According to a further aspect in the invention, additionally provide a kind of data repeating method, comprising: base station arranges HARQ maximum retransmit interval according to retransmission parameter, described retransmission parameter comprises frame structure and/or the maximum retransmission of Frame; Retransmission parameter is sent to terminal by base station; Terminal determines HARQ maximum retransmit interval according to retransmission parameter; Terminal and base station are according to HARQ maximum retransmit interval retransmission data packet may.
According to a further aspect in the invention, provide a kind of base station, comprising: setting module, for arranging HARQ maximum retransmit interval according to retransmission parameter, described retransmission parameter comprises frame structure and/or the maximum retransmission of Frame; Sending module, for sending to terminal by retransmission parameter; Retransmission module, for according to HARQ maximum retransmit interval to terminal retransmission data packet may.
According to a further aspect in the invention, provide a kind of terminal, comprising: receiver module, for receiving the retransmission parameter that base station sends, described retransmission parameter comprises frame structure and/or the maximum retransmission of Frame; Determination module, for determining HARQ maximum retransmit interval according to retransmission parameter; Retransmit receiver module, for the packet retransmitted according to reception base station, HARQ maximum retransmit interval.
According to a further aspect in the invention, provide a kind of wireless communication system, comprise above-mentioned base station and terminal.
The present invention determines HARQ maximum retransmit interval by using retransmission parameter, thus make base station and terminal when carrying out data re-transmission, the maximum retransmit interval of HARQ can be known by signalling, need not repeatedly transmit, effectively save signaling consumption, simplify retransmission processes.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of a kind of wireless frame structure of correlation technique;
Fig. 2 is the schematic diagram of the frame structure of a kind of wireless communication system of correlation technique;
Fig. 3 is the flow chart of steps of a kind of data repeating method according to the embodiment of the present invention;
Fig. 4 is the flow chart of steps of the another kind of data repeating method according to the embodiment of the present invention;
Fig. 5 is the structured flowchart of a kind of base station according to the embodiment of the present invention;
Fig. 6 is the structured flowchart of a kind of terminal according to the embodiment of the present invention;
Fig. 7 is the structured flowchart of a kind of wireless communication system according to the embodiment of the present invention.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Embodiment of the method one
With reference to Fig. 3, show the flow chart of steps of a kind of data repeating method according to the embodiment of the present invention, comprise the following steps:
Step S302: base station arranges HARQ maximum retransmit interval according to retransmission parameter;
Wherein, retransmission parameter comprises frame structure and/or the maximum retransmission of Frame, scheduling of resource situation can also be comprised, and the caching situation of base station and/or terminal, wherein the situation of base station mainly comprises the scheduling of resource tensity etc. of base station, and the caching situation of terminal refers to whether terminal buffers overflows and maybe will overflow.Such as, base station is according to the frame structure of Frame and/or maximum retransmission, and scheduling of resource situation arranges HARQ maximum retransmit and is spaced apart 7 subframes.
Step S304: the control channel signaling sent on a control channel is determined in base station according to HARQ maximum retransmit interval;
Described control channel signaling comprises retransmit interval indication information.
Such as, base station can according to the one or more re-transmission relation tables pre-set, each re-transmission relation table corresponds to one or more retransmission parameter, and this re-transmission relation table comprises the corresponding relation of the retransmit interval indication information of HARQ maximum retransmit interval and control channel signaling.Base station selects one to retransmit relation table according to retransmission parameter, therefrom searches and determines the retransmit interval indication information corresponding with HARQ maximum retransmit interval, and then determine control channel signaling.
Step S306: base station sends the signaling of retransmission parameter and control channel to terminal;
Step S308: terminal determines HARQ maximum retransmit interval according to retransmission parameter and control channel signaling;
Such as, the re-transmission relation table identical with base station is stored in terminal, by retransmission parameter, terminal determines that retransmits a relation table, and therefrom search and HARQ maximum retransmit interval that the retransmit interval indication information of control channel signaling is corresponding, using the HARQ maximum retransmit interval of the HARQ maximum retransmit interval of this correspondence as this data re-transmission.
Such as when maximum retransmission T_ReTx_Interval is 4, when system bandwidth is 5MHZ, the relation of the retransmit interval indication information in control signal SCD and N_SCD value and maximum retransmit interval MAX_Interval, as retransmitted shown in relation table 1.1, wherein a be more than or equal to 0 integer.The unit of maximum retransmit interval MAX_Interval can be subframe, frame or superframe, also can be the concrete time as second, millisecond, microsecond etc., the maximum retransmit interval MAX_Interval referred to below is also the same, repeats no longer one by one.
Table 1.1
MAX_Interval
N_SCD=0 (Binary Zero 00) 0+a
N_SCD=1 (Binary Zero 01) 1+a
N_SCD=2 (Binary Zero 10) 2+a
N_SCD=3 (Binary Zero 11) 3+a
N_SCD=4 (binary one 00) 4+a
N_SCD=5 (binary one 01) 5+a
N_SCD=6 (binary one 10) 6+a
N_SCD=7 (binary one 11) 7+a
When maximum retransmission T_ReTx_Interval is 4, when system bandwidth is 10MHZ, the relation of the retransmit interval indication information in control signal SCD and N_SCD value and maximum retransmit interval MAX_Interval, as retransmitted shown in relation table 1.2, wherein b be more than or equal to 0 integer.
Table 1.2
MAX_Interval
N_SCD=0 (Binary Zero 00) 0+b
N_SCD=1 (Binary Zero 01) 1+b
N_SCD=2 (Binary Zero 10) 2+b
N_SCD=3 (Binary Zero 11) 3+b
N_SCD=4 (binary one 00) 4+b
N_SCD=5 (binary one 01) 5+b
N_SCD=6 (binary one 10) 6+b
N_SCD=7 (binary one 11) 7+b
When maximum retransmission T_ReTx_Interval is 4, when system bandwidth is 20MHZ, the relation of the retransmit interval indication information in control signal SCD and N_SCD value and maximum retransmit interval MAX_nterval, as shown in table 1.3, wherein c be more than or equal to 0 integer.
Table 1.3
MAX_Interval
N_SCD=0 (Binary Zero 00) 0+c
N_SCD=1 (Binary Zero 01) 1+c
N_SCD=2 (Binary Zero 10) 2+c
N_SCD=3 (Binary Zero 11) 3+c
N_SCD=4 (binary one 00) 4+c
N_SCD=5 (binary one 01) 5+c
N_SCD=6 (binary one 10) 6+c
N_SCD=7 (binary one 11) 7+c
Same when T_ReTx_Interval is 8, also can obtain the form of similar table 1.1-table 1.3 when system bandwidth is 5MHZ, 10MHZ, 20MHZ, the parameter only in form changes d, e, f into, lists no longer one by one at this.Wherein a, b, c, d, e, f can be mutually equal or unequal.System bandwidths different like this can different, the complete difference or identical of part with the re-transmission relation table used in maximum retransmission situation.
It should be noted that, above-mentioned re-transmission relation table is exemplary illustration, and in actual applications, can arrange flexibly according to actual conditions, the present invention is not restricted this those skilled in the art.
Step S310: terminal and base station are according to HARQ maximum retransmit interval retransmission data packet may.
After terminal and base station all determine HARQ maximum retransmit interval, according to this HARQ maximum retransmit interval retransmission data packet may between base station and terminal.
In HARQ correlation technique, because binary parameters MAX_Interval and the corresponding relation of concrete time of the transmission of use control channel are uncertain, also need to use extra signaling clearly to inform the exact numerical values recited of this parameter of terminal, thus, when HARQ retransmits, the signaling consumption in the notice maximum retransmit time interval is large.By the present embodiment, terminal only clearly need can know the clear and definite numerical value at HARQ maximum retransmit interval according to the signaling of base station retransmission parameter and control channel, effectively save signaling consumption, simplify retransmission processes.
Embodiment of the method two
In the present embodiment, base station is first according to retransmission parameter, namely the frame structure of Frame and/or maximum retransmission determine HARQ maximum retransmit interval, the control channel signaling sent on a control channel is determined again according to this HARQ maximum retransmit interval, be SCD in the present embodiment, and this SCD is sent to terminal together with retransmission parameter.
Base station sends retransmit interval indication information T_ReTx_Interval with the value of notification terminal MAX_Interval in SCD or other indication signalings, but terminal also not only specifies the value of MAX_Interval according to SCD terminal signaling T_ReTx_Interval, also need to determine according to DL_N_MAX_ReTx, the UL_N_MAX_ReTx in frame structure and SFH the maximum retransmit interval that different situations are corresponding.Such as initialization system bandwidth is 5MHZ, subframe sum F=5, HARQ retransmit interval basic value is 3, when the retransmission offset amount of corresponding F=5 is 1, T_ReTx_Interval gets 0-7, to be the value of T_ReTx_Interval and HARQ retransmit interval basic value be corresponding MAX_Interval 3 and retransmission offset amount sum, the i.e. time of 4 frame-11 frames.Again such as, system bandwidth is 20MHZ, and subframe sum F=5, HARQ retransmit interval basic value is 3, and when the retransmission offset amount of corresponding F=5 is 0, T_ReTx_Interval gets 0-7, and corresponding MAX_Interval is the time of 3 frame-10 frames.
In order to consider in various factors one of at least or combination, the value of MAX_Interval can be formulated, the factor considered includes but not limited to: the indication signaling N_SCD in SCD, frame structure, descending maximum retransmission DL_N_MAX_ReTx, up maximum retransmission UL_N_MAX_ReTx, and the content that wherein frame structure comprises has at least: bandwidth (or FFT counts), subframe sum F, descending sub frame sum D.
The value being formulated MAX_Interval is:
MAX_Interval＝x+N_SCD+N_FrameStr+N_NumReTx(1)
Wherein, the unit of MAX_Interval is subframe; X be more than or equal to 0 integer, represent the basic value of MAX_Interval value; N_SCD is the size of the indication signaling T_ReTx_Interval notified in SCD, and scope is 0-7; N_NumReTx equals a as DL_N_MAX_ReTx=4, equal as DL_N_MAX_ReTx=8 0, a be more than or equal to 0 integer; N_FrameStr refers to the impact of frame structure on MAX_Interval, N_FrameSt value is determined according to table 2.1 or 2.2, and N is natural number, a be more than or equal to 0 integer, floor (Y) represents the maximum integer being less than or equal to Y, and Y is any real number.
Table 2.1
F＝5 F＝6 F＝7 F＝8
20MHZ (or 2048 FFT) floor((a+3) /N) floor((a+2) /N) floor((a+1) /N) f1oor(a/N)
10MHZ (or 1024 FFT) floor((a+4) /N) floor((a+3) /N) floor((a+2) /N) floor ((a+1) /N)
5MHZ (or 512 FFT) floor((a+5) /N) floor((a+4) /N) floor((a+3) /N) floor ((a+2) /N)
Table 2.2
D＝5 D＝6 D＝7
20MHZ (or 2048 FFT) floor((a+3)/N) floor((a+2)/N) floor((a+1)/N)
10MHZ (or 1024 FFT) floor((a+4)/N) floor((a+3)/N) floor((a+2)/N
5MHZ (or 512 FFT) floor((a+5)/N) floor((a+4)/N) floor((a+3)/N)
Base station is by the value of indication signaling T_ReTx_Interval notification terminal MAX_Interval, but terminal also needs according to frame structure and maximum retransmission, judges the concrete value of MAX_Interval.In other words by the corresponding relation between frame structure and maximum retransmission determination signaling T_ReTx_Interval and parameter MAX_Interval.The corresponding relation that what formula (1) represented is under different situations between signaling T_ReTx_Interval and parameter MAX_Interval.
Embodiment of the method three
In the present embodiment, base station sends signaling T_ReTx_Interval to notify the value of MAX_Interval in SCD or other indication signalings, but the value of MAX_Interval is also not only specified according to SCD terminal signaling T_ReTx_Interval, also need to determine according to DL_N_MAX_ReTx, the UL_N_MAX_ReTx in SFH the maximum retransmit interval that different situations are corresponding, but do not consider the impact that frame structure brings.As when maximum retransmission T_ReTx_Interval is 4, it is different when the value of MAX_Interval and maximum retransmission T_ReTx_Interval are 8, the value of MAX_Interval changes along with the value N_SCD difference in signaling SCD, simultaneously also relevant with maximum retransmission T_ReTx_Interval.Such as shown in table 3.1, wherein N is natural number, a be more than or equal to 0 integer, floor (Y) represents and is less than or equal to the maximum integer of Y, and Y is any real number.
Table 3.1
T_ReTx_Interval＝4 T_ReTx_Interval＝8
N_SCD=0 (Binary Zero 00) floor((x+1)/N) floor(x/N)
N_SCD=1 (Binary Zero 01) floor((x+2)/N) floor((x+1)/N)
N_SCD=2 (Binary Zero 10) floor((x+3)/N) floor((x+2)/N)
N_SCD=3 (Binary Zero 11) floor((x+4)/N) floor((x+3)/N)
N_SCD=4 (binary one 00) floor((x+5)/N) floor((x+4)/N)
N_SCD=5 (binary one 01) floor((x+6)/N) floor((x+5)/N)
N_SCD=6 (binary one 10) floor((x+7)/N) f1oor((x+6)/N)
N_SCD=7 (binary one 11) floor((x+8)/N) floor((x+7)/N)
Embodiment of the method four
With reference to Fig. 4, show the flow chart of steps of the another kind of data repeating method according to the embodiment of the present invention, comprise the following steps:
Step S402: base station arranges HARQ maximum retransmit interval according to retransmission parameter;
Wherein, retransmission parameter comprises frame structure and/or the maximum retransmission of Frame.
Such as, base station can arrange re-transmission relation table, in this table, base station first arranges a HARQ retransmit interval basic value, again retransmission offset amount is set according to the frame structure of Frame, using this HARQ retransmit interval basic value and retransmission offset amount and as HARQ maximum retransmit interval, corresponding to a retransmission parameter.
Step S404: retransmission parameter is sent to terminal by base station;
Step S406: terminal determines HARQ maximum retransmit interval according to retransmission parameter;
Such as, store the re-transmission relation table identical with base station in terminal, terminal can by selecting and search to retransmit in relation table and HARQ maximum retransmit interval that retransmission parameter is corresponding, as the HARQ maximum retransmit interval of this data re-transmission.
Step S408: terminal and base station are according to HARQ maximum retransmit interval retransmission data packet may.
Embodiment of the method five
In the present embodiment, first base station arranges HARQ maximum retransmit interval according to retransmission parameter, then retransmission parameter is sent to terminal, determines HARQ maximum retransmit interval by terminal.
Base station is not at SCD (SystemConfigurationDescriptor, system configuration describes) or other indication signalings in notify the value of HARQ maximum retransmit interval MAX_Interval, and determine according to the descending maximum retransmission DL_N_MAX_ReTx in frame structure and/or SFH (SuperframeHeader, superframe header) and/or up maximum retransmission UL_N_MAX_ReTx.
The content of frame structure at least comprises one of following or combination: system bandwidth, FFT count, every frame descending sub frame number, every frame sub-frame of uplink number, every frame subframe sum, every frame symbolic number, symbol (CPCyclicPrefix, Cyclic Prefix) length etc.Under regulation different frame structure situation, the value of MAX_Interval is identical or different.In the present embodiment, only add up to example with every frame subframe and the present invention is explained.Those skilled in the art with reference to the present embodiment, can use other frame structure above-mentioned to set HARQ and retransmit largest interval.Above-mentioned frame structure is frame structure general in correlation technique, and determine that HARQ retransmits largest interval according to above-mentioned frame structure, the technical characterstic of the correlation technique of utilization, on the basis taking into full account correlation technique, has saved and realized cost.
Due to when system bandwidth comparatively large (or system FFT counts larger) or system subframe number is larger time, the data of corresponding base station and terminal processes are also more, and make the buffer memory buffer of system and terminal not enough, the value of MAX_Interval should be less.Such as, the value determining MAX_Interval according to bandwidth (FFT counts) and subframe sum can be specified, use the value of the configuration definition MAX_Interval retransmitted in relation table 5.1, the unit of MAX_Interval is subframe, wherein F represents number of sub frames (also can be corresponding millisecond number), x is HARQ retransmit interval basic value, is natural number:
Table 5.1
F＝5 F＝6 F＝7 F＝8
20MHZ (or 2048 FFT) X+3 x+2 x+1 x
10MHZ (or 1024 FFT) X+4 x+3 x+2 x+1
5MHZ (or 512 FFT) X+5 x+4 x+3 x+2
From upper table, the present embodiment is according to subframe sum setting retransmission offset amount, when system bandwidth is 20MHZ, retransmission offset amount is set to the integer of 0 to 3 respectively according to F value, when system bandwidth is 10MHZ, retransmission offset amount is set to the integer of 1 to 4 respectively according to F value, when system bandwidth is 5MHZ, retransmission offset amount is set to the integer of 2 to 5 respectively according to F value, and subframe sum is larger, then retransmission offset amount is less, and vice versa.System bandwidth is larger, and its corresponding retransmission offset amount arranges less, and vice versa.In practical application, those skilled in the art can reference table 5.1, suitably arranges retransmission offset amount, thus arrange the value of MAX_nterval according to actual conditions.By method to set up shown in upper table, terminal when base station retransmitting data frame, can know HARQ maximum retransmit interval according to the frame structure of Frame, and realize simple, signaling consumption is little.
Again such as, the value determining MAX_Interval according to bandwidth (FFT counts) and subframe sum can be specified, but not necessarily just the value of MAX_Interval is added one every a grade, just the value of MAX_Interval can be added one every N number of grade, form is used to retransmit the value of the configuration definition MAX_Interval in relation table 5.2, the unit of MAX_Interval is subframe, wherein x represents HARQ retransmit interval basic value, for natural number, N are also natural numbers, represent grade.A be more than or equal to 0 integer, floor (Y) represents and is less than or equal to the maximum integer of Y, and Y is any real number:
Table 5.2
F＝5 F＝6 F＝7 F＝8
20MHZ (or 2048 FFT) x+floor ((a+3) /N) x+floor ((a+2) /N) x+floor ((a+1) /N) x+floor (a/N)
10MHZ (or 1024 FFT) x+floor ((a+4) /N) x+floor ((a+3) /N) x+floor ((a+2) /N) x+floor ((a+1)/N)
5MHZ (or 512 FFT) x+floor ((a+5) /N) x+floor ((a+4) /N) x+floor ((a+3) /N) x+floor ((a+2)/N)
For another example, the basis of form 5.2 is done again and optimizes, the use table 5.2 as the descending maximum retransmission DL_N_MAX_ReTx=4 indicated in SFH, as DL_N_MAX_ReTx=8, use table 5.3, wherein, b is the integer being less than or equal to a:
Table 5.3
F＝5 F＝6 F＝7 F＝8
20MHZ (or 2048 FFT) x+floor ((b+3) /N) x+floor ((b+2) /N) x+floor ((b+1) /N) x+floor (b/N)
10MHZ (or 1024 FFT) x+floor ((b+4) /N) x+floor ((b+3) /N) x+floor ((b+2) /N) x+floor ((b+1)/N)
5MHZ (or 512 FFT) x+floor ((b+5) /N) x+floor ((b+4) /N) x+floor ((b+3) /N) x+floor ((b+2)/N)
Meanwhile, consider parameter MAX_Interval just about the parameter of descending HARQ, with up irrelevant, the subframe sum in the form of form 5.1-5.3 can be made into descending sub frame sum D, thus only consider descending data volume, obtain showing 5.4-5.6:
Table 5.4
D＝5 D＝6 D＝7
20MHZ (or 2048 FFT) X+3 x+2 x+1
10MHZ (or 1024 FFT) X+4 x+3 x+2
5MHZ (or 512 FFT) X+5 x+4 x+3
Table 5.5
D＝5 D＝6 D＝7
20MHZ (or 2048 FFT) x+floor ((a+3)/N) x+floor ((a+2)/N) x+floor ((a+1)/N)
10MHZ (or 1024 FFT) x+floor ((a+4)/N) x+floor ((a+3)/N) x+floor ((a+2)/N)
5MHZ (or 512 FFT) x+floor ((a+5)/N) x+floor ((a+4)/N) x+floor ((a+3)/N)
Table 5.6
D＝5 D＝6 D＝7
20MHZ (or 2048 FFT) x+floor ((b+3)/N) x+floor ((b+2)/N) x+floor ((b+1)/N)
10MHZ (or 1024 FFT) x+floor ((b+4)/N) x+floor ((b+3)/N) x+floor ((b+2)/N)
5MHZ (or 512 FFT) x+floor ((b+5)/N) x+floor ((b+4)/N) x+floor ((b+3)/N)
It should be noted that, concrete numerical value in the present embodiment is and illustrates, as used table 5.2 during DL_N_MAX_ReTx=4, during DL_N_MAX_ReTx=8, use table 5.3, and the subframe sum F etc. in each table, when reality uses, those skilled in the art suitably can be arranged according to actual conditions, and the present invention is not restricted this.For the determination at the maximum retransmit interval shown when considering maximum retransmission shown in 5.3-5.6, its basic principle is that number of retransmissions is more, and the setting of maximum retransmit interval is shorter.
In addition, when judging the value of parameter MAX_Interval by the method for above-mentioned multiple embodiment, when adjacent twice re-transmission interval greater than MAX_Interval time, then terminal thinks this bust this carry out packet loss process, and this retransmits end.
Or, the value of parameter MAX_Interval is judged by the method for the present embodiment, but terminal is when judging whether to reach maximum retransmit interval, not only judge that whether the time interval of adjacent twice re-transmission is more than MAX_Interval, also will judge remaining number of retransmissions.Such as, as maximum downstream number of retransmissions DL_N_MAX_ReTx=4, first time bust this, after also have three times retransmit, terminal will wait for the time interval of MAX_Interval × 3, if do not receive retransmission packet, then judge packet loss.If after first time bust this, having carried out again 1 re-transmissions all not have successfully, after in addition 2 re-transmissions, terminal will wait for the time interval of MAX_Interval × 2, if do not receive retransmission packet, then judge packet loss.If first time bust this after, having carried out again twice re-transmission all not have successfully, after also have 1 time re-transmission, terminal by wait MAX_Interval the time interval, if do not receive retransmission packet, then judge packet loss.
Device embodiment
With reference to Fig. 5, show the structured flowchart of a kind of base station according to the embodiment of the present invention, comprising:
Setting module 502, for arranging HARQ maximum retransmit interval according to retransmission parameter, described retransmission parameter comprises frame structure and/or the maximum retransmission of Frame; Sending module 504, for sending to terminal by described retransmission parameter; Retransmission module 506, for according to HARQ maximum retransmit interval to terminal retransmission data packet may.
Preferably, this base station also comprises signalling module, and the control channel signaling sent on a control channel is determined at the HARQ maximum retransmit interval for arranging according to setting module 502, and described control channel signaling comprises retransmit interval indication information.Sending module 504 is also for sending this control channel signaling to terminal.
Preferably, described frame structure comprise following one of at least: system bandwidth, fast fourier transform FFT count, every frame descending sub frame number, every frame sub-frame of uplink number, the cyclic prefix CP length of every frame subframe sum, every frame symbolic number and symbol; Described maximum retransmission comprises descending maximum retransmission and/or up maximum retransmission; The signaling of described control channel comprise following one of at least: the signaling of Broadcast Control Channel SFH, the signaling of A-MAP channel and system configuration describe the signaling of SCD channel.
With reference to Fig. 6, show the structured flowchart of a kind of terminal according to the embodiment of the present invention, comprising:
Receiver module 602, for receiving the retransmission parameter that base station sends, described retransmission parameter comprises frame structure and/or the maximum retransmission of Frame; Determination module 604, for determining HARQ maximum retransmit interval according to described retransmission parameter; Retransmit receiver module 606, for the packet retransmitted according to reception base station, HARQ maximum retransmit interval.
Preferably, receiver module 602 is also for receiving the control channel signaling of base station transmission and sending to determination module 604, and described control channel signaling comprises retransmit interval indication information.Determination module 604 is also for determining HARQ maximum retransmit interval according to retransmission parameter and control channel signaling.
Preferably, described frame structure comprise following one of at least: system bandwidth, fast fourier transform FFT count, every frame descending sub frame number, every frame sub-frame of uplink number, the cyclic prefix CP length of every frame subframe sum, every frame symbolic number and symbol; Described maximum retransmission comprises descending maximum retransmission and/or up maximum retransmission; The signaling of described control channel comprise following one of at least: the signaling of Broadcast Control Channel SFH, the signaling of A-MAP channel and system configuration describe the signaling of SCD channel.
With reference to Fig. 7, show the structured flowchart of a kind of wireless communication system according to the embodiment of the present invention, comprising: base station 702 and terminal 704.
Wherein, base station 702 comprises setting module 7022, and for determining HARQ maximum retransmit interval according to retransmission parameter, described retransmission parameter comprises frame structure and/or the maximum retransmission of Frame; Sending module 7024, for sending to terminal by described retransmission parameter; Retransmission module 7026, for according to HARQ maximum retransmit interval to terminal retransmission data packet may.
Preferably, this base station 702 also comprises signalling module, and the control channel signaling sent on a control channel is determined at the HARQ maximum retransmit interval for arranging according to setting module 7022, and described control channel signaling comprises retransmit interval indication information.Sending module 7024 is also for sending this control channel signaling to terminal.
Wherein, terminal 704 comprises receiver module 7042, and for receiving the retransmission parameter that base station 702 sends, described retransmission parameter comprises frame structure and/or the maximum retransmission of Frame; Determination module 7044, for determining HARQ maximum retransmit interval according to retransmission parameter; Retransmit receiver module 7046, for the packet retransmitted according to reception base station, HARQ maximum retransmit interval.
Preferably, receiver module 7042 is also for receiving the control channel signaling of base station 702 transmission and sending to determination module 7044, and described control channel signaling comprises retransmit interval indication information.Determination module 7044 is also for determining HARQ maximum retransmit interval according to retransmission parameter and control channel signaling.
Preferably, above-mentioned frame structure comprise following one of at least: system bandwidth, fast fourier transform FFT count, every frame descending sub frame number, every frame sub-frame of uplink number, the cyclic prefix CP length of every frame subframe sum, every frame symbolic number and symbol; Described maximum retransmission comprises descending maximum retransmission and/or up maximum retransmission; The signaling of described control channel comprise following one of at least: the signaling of Broadcast Control Channel SFH, the signaling of A-MAP channel and system configuration describe the signaling of SCD channel.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (16)

1. a data repeating method, is characterized in that, comprising:
Base station arranges HARQ maximum retransmit interval according to retransmission parameter, and described retransmission parameter comprises frame structure and/or the maximum retransmission of Frame;
The control channel signaling sent on a control channel is determined in described base station according to described HARQ maximum retransmit interval, described control channel signaling comprises retransmit interval indication information;
Described base station sends described retransmission parameter and described control channel signaling to terminal;
Described terminal determines described HARQ maximum retransmit interval according to described retransmission parameter and control channel signaling;
Described terminal and described base station are according to described HARQ maximum retransmit interval retransmission data packet may;
Wherein, according to described HARQ maximum retransmit interval, described base station determines that the step of the control channel signaling sent on a control channel comprises: described base station is selected to retransmit relation table according to described retransmission parameter, and described re-transmission relation table comprises the corresponding relation between described HARQ maximum retransmit interval and described retransmit interval indication information; The described retransmit interval indication information corresponding with described HARQ maximum retransmit interval is searched in described base station from the re-transmission relation table of described selection, determines described control channel signaling; Wherein, the corresponding relation of described HARQ maximum retransmit interval and described retransmit interval indication information is determined in the following manner: described base station arranges retransmission offset amount according to described retransmission parameter, described retransmission offset amount be more than or equal to 0 integer; Described base station arrange described retransmit interval indication information, with HARQ retransmit interval basic value, with described retransmission offset amount and equal described HARQ maximum retransmit interval.
2. method according to claim 1, is characterized in that, according to described retransmission parameter and control channel signaling, described terminal determines that the step at described HARQ maximum retransmit interval comprises:
Described terminal selects the described re-transmission relation table of described terminal storage according to described retransmission parameter;
The described HARQ maximum retransmit interval that described terminal is determined from the re-transmission relation table of described selection and the retransmit interval indication information of described control channel signaling is corresponding.
3. method according to claim 1, it is characterized in that, described frame structure comprise following one of at least: system bandwidth, fast fourier transform FFT count, every frame descending sub frame number, every frame sub-frame of uplink number, the cyclic prefix CP length of every frame subframe sum, every frame symbolic number and symbol.
4. method according to claim 1, is characterized in that, described maximum retransmission comprises descending maximum retransmission and/or up maximum retransmission.
5. method according to claim 1, is characterized in that, the signaling of described control channel comprise following one of at least: the signaling of Broadcast Control Channel SFH, the signaling of business control channel A-MAP channel and system configuration describe the signaling of SCD channel.
6. a data repeating method, is characterized in that, comprising:
Base station arranges HARQ maximum retransmit interval according to retransmission parameter, and described retransmission parameter comprises frame structure and/or the maximum retransmission of Frame;
Described retransmission parameter is sent to terminal by described base station;
Described terminal determines described HARQ maximum retransmit interval according to described retransmission parameter;
Described terminal and described base station are according to described HARQ maximum retransmit interval retransmission data packet may;
The step that wherein said base station arranges HARQ maximum retransmit interval according to retransmission parameter comprises: described base station is read according to described retransmission parameter and retransmitted relation table, and described re-transmission relation table comprises the corresponding relation at described retransmission parameter and described HARQ maximum retransmit interval; The described HARQ maximum retransmit interval that described base station is determined from described re-transmission relation table and described retransmission parameter is corresponding, wherein, the corresponding relation at described retransmission parameter and described HARQ maximum retransmit interval is determined in the following manner: described base station arranges retransmission offset amount according to described retransmission parameter; That described base station arranges described retransmission offset amount and HARQ retransmit interval basic value and HARQ maximum retransmit interval for corresponding to described retransmission parameter.
7. method according to claim 6, is characterized in that, according to described retransmission parameter, described terminal determines that the step at described HARQ maximum retransmit interval comprises:
Described terminal reads the described re-transmission relation table of described terminal storage according to described retransmission parameter;
The described HARQ maximum retransmit interval that described terminal is determined from described re-transmission relation table and described retransmission parameter is corresponding.
8. method according to claim 6, it is characterized in that, described frame structure comprise following one of at least: system bandwidth, fast fourier transform FFT count, every frame descending sub frame number, every frame sub-frame of uplink number, the cyclic prefix CP length of every frame subframe sum, every frame symbolic number and symbol.
9. method according to claim 6, is characterized in that, described maximum retransmission comprises descending maximum retransmission and/or up maximum retransmission.
10. a base station, is characterized in that, comprising:
Setting module, for arranging HARQ maximum retransmit interval according to retransmission parameter, described retransmission parameter comprises frame structure and/or the maximum retransmission of Frame;
Sending module, for sending to terminal by described retransmission parameter;
Retransmission module, for according to described HARQ maximum retransmit interval to described terminal retransmission data packet may,
Wherein, described setting module arranges HARQ maximum retransmit interval according to retransmission parameter and comprises: described setting module reads according to described retransmission parameter and retransmits relation table, and described re-transmission relation table comprises the corresponding relation at described retransmission parameter and described HARQ maximum retransmit interval; The described HARQ maximum retransmit interval that described setting module is determined from described re-transmission relation table and described retransmission parameter is corresponding, wherein, the corresponding relation of described HARQ maximum retransmit interval and described retransmit interval indication information is determined in the following manner: described setting module arranges retransmission offset amount according to described retransmission parameter; That described setting module arranges described retransmission offset amount and HARQ retransmit interval basic value and HARQ maximum retransmit interval for corresponding to described retransmission parameter.
11. base stations according to claim 10, is characterized in that, also comprise:
Signalling module, the control channel signaling sent on a control channel is determined at the described HARQ maximum retransmit interval for arranging according to described setting module, and described control channel signaling comprises retransmit interval indication information;
Described sending module also for sending described control channel signaling to described terminal wherein, described retransmission offset amount be more than or equal to 0 integer.
12. base stations according to claim 11, is characterized in that,
Described frame structure comprise following one of at least: system bandwidth, fast fourier transform FFT count, every frame descending sub frame number, every frame sub-frame of uplink number, the cyclic prefix CP length of every frame subframe sum, every frame symbolic number and symbol;
Described maximum retransmission comprises descending maximum retransmission and/or up maximum retransmission;
The signaling of described control channel comprise following one of at least: the signaling of Broadcast Control Channel SFH, the signaling of business control channel A-MAP channel and system configuration describe the signaling of SCD channel.
13. 1 kinds of terminals, is characterized in that, comprising:
Receiver module, for receiving the retransmission parameter that base station sends, described retransmission parameter comprises frame structure and/or the maximum retransmission of Frame;
Determination module, for determining HARQ maximum retransmit interval according to described retransmission parameter;
Retransmit receiver module, for the packet retransmitted according to reception base station, described HARQ maximum retransmit interval;
Wherein, according to described retransmission parameter, described determination module determines that HARQ maximum retransmit interval comprises: described determination module reads according to described retransmission parameter and retransmits relation table, and described re-transmission relation table comprises the corresponding relation at described retransmission parameter and described HARQ maximum retransmit interval; The described HARQ maximum retransmit interval that described determination module is determined from described re-transmission relation table and described retransmission parameter is corresponding, wherein, the corresponding relation at described retransmission parameter and described HARQ maximum retransmit interval is determined in the following manner: described determination module arranges retransmission offset amount according to described retransmission parameter; That described determination module arranges described retransmission offset amount and HARQ retransmit interval basic value and HARQ maximum retransmit interval for corresponding to described retransmission parameter.
14. terminals according to claim 13, is characterized in that, described receiver module is also for receiving the control channel signaling of described base station transmission and sending to determination module, and described control channel signaling comprises retransmit interval indication information;
Described determination module also for determining described HARQ maximum retransmit interval according to described retransmission parameter and described control channel signaling, wherein, described retransmission offset amount be more than or equal to 0 integer.
15. terminals according to claim 14, is characterized in that,
Described frame structure comprise following one of at least: system bandwidth, fast fourier transform FFT count, every frame descending sub frame number, every frame sub-frame of uplink number, the cyclic prefix CP length of every frame subframe sum, every frame symbolic number and symbol;
Described maximum retransmission comprises descending maximum retransmission and/or up maximum retransmission;
The signaling of described control channel comprise following one of at least: the signaling of Broadcast Control Channel SFH, the signaling of business control channel A-MAP channel and system configuration describe the signaling of SCD channel.
16. 1 kinds of wireless communication systems, is characterized in that, comprising:
According to claim 10 to the base station described in 11 any one;
According to claim 13 to the terminal described in 15 any one.
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