CN102318254B - Method for requesting retransmission, method for retransmission and devices thereof - Google Patents
Method for requesting retransmission, method for retransmission and devices thereof Download PDFInfo
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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
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Abstract
A method for requesting retransmission, method for retransmission and the corresponding transmitter, receiver and system are provided. The method for requesting retransmission includes the following steps: signals from the transmitter are received and whether retransmission is needed is judged; the indication information of whether the transmitter needs to execute retransmission is fed back in a main feedback channel; if retransmission is needed, then retransmission enhancement information is fed back in a second feedback channel associated with the main feedback channel, and the retransmission enhancement information is used for improving the reception quality or the transmission efficiency of retransmission signals. With the technical solution, the quality and efficiency of retransmission can be effectively improved.
Description
Technical field
Field of wireless transmission of the present invention, particularly relates to request retransmission method, repeating method and equipment thereof.
Background technology
In current standard (as WiMAX and LTE), for each transmission, only support one to mix repeat requests (HARQ) feedback channel, this feedback channel is used to feedback " ACK " (not needing to retransmit) and " NACK " (needing to retransmit) only.Do not allow extra information along with " NACK " feeds back together.
Current HARQ carries out based on transmission block (TB).The TB receiving for each and the HARQ information being associated, HARQ processes and attempt the decoding data in soft buffer memory (soft buffer).If the data in soft buffer memory are successfully decoded, the sure confirmation (ACK) of raw paired data in this HARQ processes.Otherwise, the negative confirmation (NACK) of raw paired data in this HARQ processes.
The TB being sent out for each and the HARQ information being associated, if received the sure confirmation of data (ACK) in this HARQ processes, HARQ processes send next TB.Otherwise, if receive the confirmation negative to data (NACK) in this HARQ processes, retransmit this TB.
HARQ should be based on incremental redundancy (Incremental Redundancy).Should be noted that chase merging is a kind of special circumstances of incremental redundancy and therefore certainly also can be supported.
In layer 1, from MAC, receive HARQ acknowledgement bit.Each sure confirmation (ACK) is encoded to binary " 0 ", and each negative confirmation " NACK " is encoded to binary " 1 ".
In order to improve the quality of above-mentioned HARQ, in the standardization of IEEE.16m is discussed, a lot of advanced persons' HARQ technology has been proposed.Its most requirement when needs retransmit, receiving terminal feeds back quality or the validity that extra information is improved re-transmission.The example of proposed additional feedback information below.
Retransmission information length: in some scenes, in the information of original transmission, only some,, by heavy damage, and receives remaining information with gratifying quality.In this case, by retransmitting part raw information rather than whole raw information, can significantly improve spectrum efficiency.Thereby additional feedback must inform which partial information BS need to retransmit.
Be used for the interlacing pattern retransmitting: in order to make full use of better the frequency/time diversity of channel, order that can be different by the order from using in previous transmission is transmitted the sign bit of re-transmission.This means and can use different interlacing patterns, these interlacing patterns can be in advance fixing or according to current channel conditions, selected from the interlacing pattern set limiting in advance by MS, and to BS, feed back together in company with NACK signal.
FEC piece index: in some cases, several FEC pieces are shared identical CRC part to reduce load.When mistake being detected, probably not every FEC piece and just its part make a mistake.In this case, the FEC piece that only re-transmission makes a mistake rather than all FEC pieces will be more efficient.
Code book (codebook) index: when system adopts the precoding MIMO processing based on code book, the channel condition of the channel condition of re-transmission conventionally and in original/previously transmission is different.Therefore for the optimum pre-coding matrix that retransmits also probably from for original/previously the optimum pre-coding matrix of transmission was different.According to current channel condition and the signal that previously received, MS can reselect the performance that pre-coding matrix is optimized re-transmission, and by the index of the pre-coding matrix upgrading together with NACK signal to BS feedback, to improve the quality of re-transmission.
From discussion above, we can find out in order to improve quality and the efficiency of re-transmission, expect extra information along with " NACK " sends.And not yet have now a technical scheme that how to send this extraneous information.
Summary of the invention
In order to address the above problem, embodiments of the present invention have proposed system, transmitter, receiver and the method thereof for retransmitting.
According to the one side of embodiment of the present invention, a kind of method of request retransmission has been proposed, comprise the following steps: receive from the signal of transmitter and judge whether to need to retransmit the indication information that whether feedback needs transmitter to retransmit in primary feedback channel; And if need to retransmit, in the second feedback channel being associated with primary feedback channel, feedback retransmits enhancing information, this re-transmission enhancing information is for improving the quality of reception of the signal being retransmitted or the information of transmission availability.
According to embodiment of the present invention on the other hand, proposed a kind of repeating method, comprised the following steps: receive primary feedback channel and the second feedback channel of being associated with described primary feedback channel in feedback signal; If find to carry in primary feedback channel, require the message retransmitting and in the second feedback channel being associated with primary feedback channel, carry the enhancing information that retransmits, according to the described re-transmission enhancing information of carrying in the second feedback channel, retransmit, wherein said re-transmission enhancing information is for improving the quality of reception of the signal being retransmitted or the information of transmission availability.
According to embodiment of the present invention on the other hand, a kind of transmitter has been proposed, comprise: reception control unit, the feedback signal of the second feedback channel that is used for receiving primary feedback channel and is associated with described primary feedback channel, if find to carry in primary feedback channel, require the message retransmitting and in the second feedback channel being associated with primary feedback channel, carry the enhancing information that retransmits, indication retransmits according to the described re-transmission enhancing information of carrying in the second feedback channel, wherein said re-transmission enhancing information is for improving the quality of reception of the signal being retransmitted or the information of transmission availability, retransmission unit, for retransmitting according to indication.
According to embodiment of the present invention on the other hand, a kind of receiver has been proposed, comprise: sending controling unit, for receiving from the signal of transmitter and judge whether to need to retransmit, the indication indication information that whether feedback needs transmitter to retransmit in primary feedback channel; And if need to retransmit, indication feedback in the second feedback channel being associated with primary feedback channel retransmits enhancing information, described re-transmission enhancing information is for improving the quality of reception of the signal being retransmitted or the information of transmission availability; Feedback unit: for feeding back according to indication.
According to embodiment of the present invention on the other hand, propose the system for retransmitting, comprised above transmitter and above receiver.
Existing HARQ feedback channel structure can not support senior HARQ technology to require improving from the extraneous information of MS the quality/efficiency retransmitting.Technical scheme of the present invention has solved this problem by introducing hierarchy and the 2nd HARQ feedback channel based on competition mechanism of HARQ feedback channel.This technical scheme not only provides the solution of supporting advanced HARQ technology, has also minimized potential load.Because many main HARQ feedback channels are shared one article of the 2nd HARQ feedback channel in the mode of competition, can effectively reduce extra feedback load.By careful selection, share the number of the main HARQ feedback channel of one article of the 2nd HARQ feedback channel, effectively control hazard probability maximize the efficiency of the 2nd HARQ feedback channel.
Accompanying drawing explanation
According to following description by reference to the accompanying drawings, the advantage of the present invention easy to understand that will become, wherein:
Fig. 1 is the result schematic diagram that the reception of LTE is simulated;
Fig. 2 is the system configuration schematic diagram according to embodiment of the present invention;
Fig. 3 is the transmitter architecture schematic diagram according to embodiment of the present invention;
Fig. 4 is the receiver structure schematic diagram according to embodiment of the present invention;
Fig. 5 is according to the flow chart of the request retransmission of embodiment of the present invention;
Fig. 6 shows the schematic diagram of classification retransmission feedback channel architecture according to the embodiment of the present invention;
Fig. 7 is the schematic diagram for transmission decoding mortality=0.1 o'clock collision probability and resource utilization according to embodiment of the present invention;
Fig. 8 is the schematic diagram for transmission decoding mortality=0.2 o'clock collision probability and resource utilization according to embodiment of the present invention;
Fig. 9 is coding step flow chart according to the embodiment of the present invention;
Figure 10 illustrates the schematic diagram that changes according to the embodiment of the present invention the example that retransmits form based on code block mistake;
Figure 11 is the flow chart retransmitting according to embodiment of the present invention;
Figure 12 shows the embodiment of the present invention HARQ proposing and the gain schematic diagram that changes re-transmission form.
Embodiment
Below with reference to accompanying drawing, embodiments of the present invention are described in detail.
From to finding out the analysis of prior art, in order to improve quality and the efficiency of re-transmission, need to be by some extra information along with " NACK " sends together.The 2nd HARQ feedback channel can be provided in embodiments of the present invention.Owing to only just needing extra re-transmission to strengthen information when feeding back " NACK ", be therefore difficult in advance to each user assignment the 2nd HARQ feedback channel.A kind of possible solution is to be one article of the 2nd HARQ feedback channel of each user assignment.But due in real system, the failed possibility of decoding is roughly about 10%～20%, and one article of the 2nd HARQ feedback channel of each user assignment can be wasted more than 80% resource if.Therefore preferably, embodiments of the present invention have proposed the 2nd HARQ feedback channel based on competition mechanism to address this problem.
The basic thought of embodiment of the present invention is the hierarchy that defines HARQ feedback channel: main HARQ feedback channel is identical with traditional HARQ feedback channel, for the designator of transmission " ACK " and " NACK ", the transmission that the 2nd HARQ feedback channel is feedback " NACK " is for sending extra information to improve the quality/efficiency retransmitting.Main HARQ channel is for specific transmission (transmission-specific), and the transmission that is each support HARQ distributes a main HARQ feedback channel.The 2nd HARQ feedback channel is distributed to many main HARQ feedback channels and share, need the user who retransmits can on the 2nd HARQ feedback channel, feed back the reinforcement information that retransmits.A plurality of need to the user of feedback information need to being at war with on same the 2nd HARQ feedback channel.
The up channel of 3G LTE system of take below describes as example.
In 3G LTE, the size of transmission block (TB) is larger than the TB in UMTS.In defined TB, nearly 64.5% is segmented into a plurality of code blocks (CB).TB and CB thereof protect with same CRC.In a TB, may only have minority CB to decode unsuccessfully, but whole TB can be retransmitted, thereby cause the waste of resource.In the result of simulating with parameter as shown in table 1, show, when the first transmitted error rate is about 5%～20%, the ratio of waste is about 15%～20%.
Table 1 analog parameter
When using 2/3Turbo code, 16QAM and 10MHz, add that the size of the transmission block of CRC sequence is 14688, be segmented into 3 code blocks.
Fig. 1 shows the result of simulation.As can be seen from Figure 1, when the first transmitted error rate is about 10%, code block accuracy reaches 20%.When bandwidth broadens, when transmission block becomes large, it is large that code block accuracy becomes, and the waste that re-transmission transmission block causes is also larger.
In order to address this problem, embodiments of the present invention have proposed base station, mobile terminal, the system and method for retransmitting.
Embodiments of the present invention have proposed the system for retransmitting, and as shown in Figure 2, this system comprises transmitter and receiver as described below.
Embodiments of the present invention have also proposed the transmitter for retransmitting, as shown in Figure 3, this transmitter comprises: reception control unit 310, the feedback signal of the second feedback channel that is used for receiving primary feedback channel and is associated with primary feedback channel, if find to carry in primary feedback channel, require the indication information retransmitting and in the second feedback channel being associated with primary feedback channel, carry the enhancing information that retransmits, indication retransmits according to the re-transmission enhancing information of carrying in the second feedback channel, wherein retransmitting enhancing information is for improving the quality of reception of the signal being retransmitted or the information of transmission availability, retransmission unit 320, for retransmitting according to indication.
Wherein, reception control unit 310 comprises: despreading module 312, for using the signal that the frequency expansion sequence that is associated with primary feedback channel receives the second feedback channel to carry out despreading; Measurement module 314, for measuring the SINR of the signal after 312 despreadings of despreading module; Judging module 316, while being greater than predetermined threshold value for the SINR measuring when judgement measurement module 314, indication utilizes the resulting re-transmission enhancing of despreading module 312 despreading information to retransmit.
This transmitter also can comprise channels associated unit 330, for setting in advance the corresponding relation between primary feedback channel and the second feedback channel, for despreading module 312, uses.
This transmitter also can comprise frequency expansion sequence processing unit 340, for pre-determining frequency expansion sequence group, for each main HARQ feedback channel distributes a frequency expansion sequence in this frequency expansion sequence group, for despreading module 3 12, uses.
Embodiments of the present invention have proposed the receiver for retransmitting, as shown in Figure 4, this receiver comprises sending controling unit 410, for receiving from the signal of transmitter and judging whether to need to retransmit, and the indication information that feedback request transmitter retransmits in primary feedback channel; If need to retransmit, in the second feedback channel being associated with primary feedback channel, feedback retransmits enhancing information, and wherein retransmitting enhancing information is for improving the quality of reception of the signal being retransmitted or the information of transmission availability; Feedback unit 420, for feeding back according to indication.
This receiver also comprises spectrum-spreading unit 430, for using the frequency expansion sequence being associated with primary feedback channel to carry out spread spectrum to this re-transmission enhancing information; The re-transmission that sending controling unit 410 indications are carried after spread spectrum in the second feedback channel being associated with primary feedback channel strengthens information.
This receiver also can comprise frequency expansion sequence processing unit 440, for pre-determining frequency expansion sequence group, for each main HARQ feedback channel distributes a frequency expansion sequence in this frequency expansion sequence group, for spectrum-spreading unit 430, uses.This receiver also can comprise channels associated unit 450, for setting in advance the corresponding relation between primary feedback channel and the second feedback channel, for sending controling unit 410, uses.When using mobile terminal as receiver, sending controling unit 410 and spectrum-spreading unit 430 also can receive the information about corresponding relation between frequency expansion sequence and primary feedback channel and the second feedback channel from the base station as transmitter.
Although above with the formal description of separated functional module the transmitter and receiver of the embodiment of the present invention, but each assembly shown in Fig. 3 and Fig. 4 can be realized with a plurality of devices in actual applications, and a plurality of assemblies that illustrate also can be integrated in chip piece or an equipment in actual applications.This transmitter and receiver also can comprise any unit and the device for other object.
The method according to above-mentioned transmitter and receiver, embodiments of the present invention being provided is below described.
Fig. 5 shows the flow chart of request retransmission in embodiment of the present invention.As shown in Figure 5, in step 510, the channels associated unit 330 of transmitter or the channels associated unit 450 of receiver arrange the corresponding relation between primary feedback channel and the second feedback channel.
Fig. 6 shows the hierarchy of the HARQ feedback channel in embodiment of the present invention.As shown in Figure 6, many main HARQ feedback channels are shared the 2nd public HARQ feedback channel.When one or more transmission that are associated with these main HARQ feedback channels are decoded unsuccessfully, corresponding user is for to be at war with and to improve quality and the efficiency of re-transmission to send extra information to base station with the second HARQ feedback channel.Especially, there are following three kinds of situations:
If only occur one, decode unsuccessfully, corresponding user can successfully send on the 2nd HARQ feedback channel retransmitting enhancing information.BS this message of decoding in the 2nd HARQ feedback channel decoding, and use this message design to retransmit form, the i.e. pre-coding matrix of failure, retransmission information, the interlacing pattern that uses etc.
If there is more than one decoding failure, when more than one user sends the while on the 2nd HARQ feedback channel, conflict has occurred.In this case, BS can rely on different frequency expansion sequences and distinguish the re-transmission enhancing information from different user on the 2nd HARQ feedback channel, and utilizes the SINR after despreading to judge that whether detection is correct.If the SINR after despreading, higher than a predetermined threshold, thinks, detect correctly, and use this information to retransmit.If, lower than this predetermined threshold, thinking, the SINR after despreading detection mistake retransmits the conventional situation degenerating to without any retransmitting enhancing information.
If all transmission are all successfully decoded, transmission of information not on the 2nd HARQ feedback channel.
The key Design of embodiment of the present invention considers to be the balance between balance collision probability.Collision probability depends on the number (N) of the main HARQ feedback channel of sharing same the 2nd HARQ feedback channel and the decoding failure probability (p of each transmission
e).By reducing the number of the main HARQ feedback channel of sharing same the 2nd HARQ feedback channel, can effectively reduce collision probability (p
c), yet reduced equally the utilance (eff) of the 2nd HARQ feedback channel.Subsequently, we are by the balance of analyzing between collision probability and resource utilization.
Suppose that the main HARQ feedback channel of N bar shares one article of the 2nd HARQ feedback channel.The decoding failure probability of supposing each transmission is p
e.Can calculate collision probability is:
P
c＝1-Np
e(1-p
e)
N-1-(1-p
e)
N
Resource utilization can be expressed as the probability that success is transmitted on the 2nd HARQ feedback channel, that is:
eff＝Np
e(1-p
e)
N-1
The target of balance is for the p providing
e, select suitable value N, to keep p
cin the time of lower than acceptable value, maximize eff.
Fig. 7 and Fig. 8 are respectively for p
e=0.1 and 0.2 situation shows p
c, the relation between eff and N.As shown in Figure 7 and Figure 8, can find out for N, efficiency has global maximum point, and p
ealong with the growth of N, increase, this is reasonably, because when how main HARQ feedback channel is shared public a 2nd HARQ feedback channel, collision probability will increase.For different p
e, can select suitable value N with at p according to these figure
clower than maximum efficiency eff under the constraint of predetermined threshold.Suppose that collision probability should be lower than 10%.For p
e=0.1, can select N=5; For p
e=0.2, can select N=3.
In step 512, the series processing unit 340 of transmitter or the frequency expansion sequence processing unit 440 of receiver pre-determine frequency expansion sequence (quadrature or semi-orthogonal sequence) group.
In addition, the frequency expansion sequence processing unit 340 of transmitter or the frequency expansion sequence processing unit 440 of receiver distribute a frequency expansion sequence in this frequency expansion sequence group for each main HARQ feedback channel.Number N based on the main HARQ feedback channel of determined corresponding same the 2nd HARQ feedback channel in step 610, and the size of the determined frequency expansion sequence group of step 620, can distribute similar and different frequency expansion sequence for different main HARQ feedback channels.For example, if the number N of main HARQ feedback channel is greater than the size of frequency expansion sequence group, be first that main HARQ feedback channel distributes different frequency expansion sequences, after frequency expansion sequence distributes, reuse the frequency expansion sequence group of having distributed, distributed to as remaining main HARQ feedback channel.
In step 514, between BS and MS, share frequency expansion sequence group and and main HARQ feedback channel between corresponding relation.
In actual application, preferably, step 510 is carried out in base station to 514, and at this time, base station may be transmitter, may be also receiver.Now, mobile terminal can receive from base station the information about corresponding relation between frequency expansion sequence and primary feedback channel and the second feedback channel.Meanwhile, it will be appreciated by those skilled in the art that the determined information of above step can be used in repeatedly retransmitting, therefore there is no need repeating this step before retransmitting each time.
For the purpose of describing, suppose that in the following description transmitter is base station, receiver is mobile terminal.
First the method for request retransmission is described.
In step 516, its transmission receiving if mobile terminal can not successfully be decoded, this loading error occurring is described, the feedback unit 420 of receiver feeds back " NACK " message in main HARQ feedback channel, and the spectrum-spreading unit 430 of mobile terminal is used the frequency expansion sequence distributing for main HARQ feedback channel to carry out spread spectrum to retransmitting enhancing information.
In step 518, feedback unit 420 sends being carried at by the information of spread spectrum in the 2nd HARQ feedback channel being associated with this main HARQ feedback channel.
In LTE, CRC sequence is attached to each code block.Fig. 9 shows the processing structure for DL-SCH, PCH and MCH transmission channel.In each Transmission Time Interval (TTI) data, to be the form of a transmission block to the maximum, arrive coding unit, as shown in Figure 9, can determine following coding step:
Step 910: CRC is increased to transmission block
Step 920: the CRC that this span line is carried out to code block segmentation and code block adheres to
Step 930: carry out chnnel coding to having carried out the code block that code block segmentation and code block CRC adhere to
Step 940: carry out rate-matched
Step 950: code block series connection
By cyclic redundancy check (CRC) (CRC), to transmission block, provide error detection.Whole transmission block is used for calculating CRC check position.
The input bit sequence table of code block segmentation in step 920 is shown to b
0, b
1, b
2, b
3..., b
b-1, wherein, B > 0.If B is greater than maximum code block size Z, carries out the segmentation to input bit sequence, and the CRC sequence of extra L=24 is attached to each code block.Maximum code block size is: Z=6144.
The HARQ scheme proposing is paid close attention to the details of TB data more.Although transmission is always based on TB, this feedback is different from the HARQ based on transmission block with re-transmission.
In the present embodiment, there are two kinds of designators: main designator and the second designator, wherein, main designator is a binary system, for being carried at ACK or the NACK of main HARQ feedback channel transmission, the second designator is the bitmap sequence of code block, the re-transmission enhancing information of transmitting for being carried at the 2nd HARQ feedback channel.For example, there is no the maximum TB of special multiplexed is 73712.If maximum code block size is: Z=6144, so corresponding code block number is 12.As shown in table 2 to the additional 4 bit CRC of HARQ designator (HI) (the second designator).
Code word in the code block of table 2 based on HARQ
If transmission block is mapped to two-layer spatial reuse, this transmission block can double.Method is to make designator increase to 24 bits, but may cause overload.Another kind method is to use 12 bits, with two code blocks of 1 bit indication.
According to transmission property (that is, only including the transmission block of incorrect code block), the HARQ scheme of submitting to should be adaptive.
Self adaptation means with initial transmission to be compared, transmitter can change each time the some or all of attributes that use in retransmitting (as, due to the variation of transport block format).Therefore, the control information being associated need to be sent along with retransmitting together.The change of considering comprises:
First: code check
Secondly: modulation
The the 3rd: resource unit allocation
Use this HARQ scheme propose, HARQ flow process is to previous similar.It comprises (stop-and-wait) agreements such as IR, N-channel stop, synchronous or asynchronous, self adaptation and soft cache management.Although feedback HARQ designator can take more bits, re-transmission can be applied lower code speed to obtain higher receptivity.
If HARQ designator CRC verifies as failure, retransmit whole TB and do not affect HARQ flow process.
Figure 10 shows according to code block mistake and changes an execution mode that retransmits form.As shown in figure 10, initial transmission is applied 2/3 Turbo code and 16 QAM, and a transmission block is divided into 3 code blocks.If receiver checks two code blocks to make mistakes, another is correct, feedback indicator 110 (or 011,101).Transmitter understands should retransmit two initial code blocks (or two last code blocks, or first and the 3rd code block).In order to fill whole transmission block, application 4/9 Turbo code speed also keeps 16QAM modulation.
If receiver check only have a code block make mistakes and all the other two be correct, feedback indicator 100 (or 010,001).Transmitter understands should retransmit first code block (or penultimate code block, or the 3rd code block).In order to fill whole transmission block, should keep 4/9 Turbo code speed and apply QPSK modulation.
Adopt technique scheme, when obtaining higher retransmission quality and efficiency, little on the load impact of system.The main designator of 1 bit is used to indicate the ACK/NACK whether transmission block makes mistakes, and the second designator is used to indicate the bitmap of code block mistake, if sure confirmation (ACK) is encoded in main designator, just without the second designator is encoded.Take the second designator as 16 being example, suppose that loading error occurring probability is 10%～20% first, the total load of feedback is:
Loading error occurring probability is 10%:1 bit*90%+ (1+16) bits*10%=2.6 bits first
Loading error occurring probability is 20%:1 bit*80%+ (1+16) bits*20%=4.2 bits first
Can find out, actual load is less than 5 bits.In addition transmission block size determines the second designator size.If limit the size of the second designator according to transmission block size, actual load can be less.
Next the method that explanation retransmits.Figure 11 is the flow chart retransmitting according to embodiment of the present invention.As shown in figure 11:
In step 1110, when carrying " NACK " message in main HARQ feedback channel, the despreading module 312 in the reception control unit 310 of base station is used the frequency expansion sequence being associated with main HARQ feedback channel to carry out despreading to the signal receiving in the 2nd HARQ feedback channel.
In step 1120, the measurement module 314 of base station is measured the SINR of the signal after despreading.
In step 1130, the judging module 316 of base station determines whether the SINR that measurement module 314 is measured is greater than predetermined threshold value, if be greater than predetermined threshold value, think successful to the detection of the 2nd HARQ feedback channel, in step 1150, the retransmission unit 320 of base station utilizes the re-transmission enhancing information that 312 despreadings of despreading module obtain to retransmit; Otherwise, think failed to the detection of the 2nd HARQ feedback channel, in step 1140, abandon resulting re-transmission and strengthen information, and retransmission unit 320 is carried out conventional HARQ re-transmission.
Figure 12 shows the embodiments of the present invention HARQ proposing and the gain schematic diagram that changes re-transmission form.As shown in figure 12, according to code block mistake, the use proposing changes the HARQ scheme of re-transmission form to be compared with conventional IR HARQ scheme, can obtain the gain of 1dB.
To the description of the method for retransmitting, based on base station, be transmitter above, mobile terminal is receiver (being down link) and making, yet, those skilled in the art are easy to know by inference, and it is that receiver, mobile terminal are the situations of transmitter (being up link) that said system, transmitter, receiver and method also can be used for base station.
In above execution mode, for many main HARQ feedback channels, use one article of the 2nd HARQ feedback channel, in actual applications, also can use the 2nd HARQ feedback channel more than.For example, in the situation that wireless environment is more severe, can increase the quantity of the 2nd HARQ feedback channel to reduce the probability clashing.
The technical scheme that embodiments of the present invention provide can be applicable to other high-speed radiocommunication system equally, in LTE-Advanced and WiMAX IEEE 802.16 systems.Equally, according to different systems, the content comprising in retransmitting enhancing information also can be different, such as can also comprise interlacing pattern, FEC index and/or the code book index etc. for retransmitting in retransmitting enhancing information, is not limited to the retransmission information length that above-mentioned execution mode is used.
Those skilled in the art should be easy to recognize, can realize by programmed computer the different step of said method.At this, some execution modes comprise equally machine readable or computer-readable program storage device (as, digital data storage medium) and coding machine can carry out or the executable program command of computer, wherein, some or all steps of said method are carried out in this instruction.For example, program storage device can be digital storage, magnetic storage medium (as Disk and tape), hardware or the readable digital data storage medium of light.Execution mode comprises the programmed computer of the described step of carrying out said method equally.
Description and accompanying drawing only illustrate principle of the present invention.Therefore should be appreciated that those skilled in the art can advise different structures, although these different structures clearly do not describe herein or illustrate, within having embodied principle of the present invention and being included in its spirit and scope.In addition, all examples of herein mentioning are the main only design with help reader understanding's principle of the present invention and promotion this area that inventor was contributed for teaching purpose clearly, and should be interpreted as not being the restriction to these specific examples of mentioning and condition.In addition, all statement and specific examples thereof of mentioning principle of the present invention, aspect and execution mode comprise its equivalent interior herein.
Description is above only for realizing embodiments of the present invention; it should be appreciated by those skilled in the art; the any modification or partial replacement not departing from the scope of the present invention; all should belong to the scope that claim of the present invention limits; therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (21)
1. a method for request retransmission, comprising:
Reception is from the signal of transmitter and judge whether to need to retransmit the indication information that whether feedback needs transmitter to retransmit in primary feedback channel; And
If need to retransmit, in the second feedback channel being associated with primary feedback channel, feedback retransmits enhancing information, and described re-transmission enhancing information is for improving the quality of reception of the signal being retransmitted or the information of efficiency of transmission;
Wherein, in described the second feedback channel being associated with primary feedback channel, carrying re-transmission enhancing information comprises:
Use the frequency expansion sequence being associated with primary feedback channel to carry out spread spectrum to described re-transmission enhancing information;
Re-transmission after spread spectrum is strengthened to information to be carried in the second feedback channel and to send in the mode of competing.
2. method according to claim 1, wherein, a plurality of code blocks form the transmission block for transmitting, and the bitmap sequence of carrying described code block in described the second feedback channel in the described re-transmission enhancing information of transmitting is to inform described in transmitter in transmission block which code block needs to retransmit.
3. method according to claim 2, also comprises,
Set up the corresponding relation between described primary feedback channel and described the second feedback channel.
4. method according to claim 3, wherein, the described corresponding relation of setting up between primary feedback channel and described the second feedback channel comprises that to select many primary feedback channels corresponding with at least one the second feedback channels;
Described the re-transmission enhancing information by spread spectrum is carried to send in the second feedback channel comprise that the re-transmission after spread spectrum is strengthened to information to be sent at least one the second feedback channels that are associated with described many primary feedback channels in the mode of competition.
5. according to the method described in claim 1 to 4 any one, also comprise,
Pre-determine the frequency expansion sequence group that comprises described frequency expansion sequence;
For a frequency expansion sequence in frequency expansion sequence group described in each primary feedback channel allocation;
Between transmitter and receiver, share described frequency expansion sequence group and with the corresponding relation of primary feedback channel.
6. method according to claim 5, wherein, the number of the size based on described frequency expansion sequence group and the primary feedback channel corresponding with described the second feedback channel, is the similar and different frequency expansion sequence of different primary feedback channel allocation.
7. method according to claim 6, wherein, described frequency expansion sequence is semi-orthogonal sequence or orthogonal sequence.
8. a repeating method, comprises step:
Feedback signal in the second feedback channel that receives primary feedback channel and be associated with described primary feedback channel;
If find to carry in primary feedback channel, require the indication information retransmitting and in the second feedback channel being associated with primary feedback channel, carry the enhancing information that retransmits, according to the described re-transmission enhancing information of carrying in described the second feedback channel, retransmit, wherein said re-transmission enhancing information is for improving the quality of reception of the signal being retransmitted or the information of transmission availability, wherein, describedly according to the re-transmission enhancing information of carrying in the second feedback channel, retransmit and comprise:
Use the frequency expansion sequence being associated with described primary feedback channel to carry out despreading to the signal receiving in described the second feedback channel;
Measure the Signal to Interference plus Noise Ratio SINR of signal after described despreading;
Described SINR is compared with a predetermined threshold, if described SINR is greater than described threshold value, utilize the resulting re-transmission enhancing of despreading information to retransmit, if described SINR is less than described threshold value, abandon the signal receiving in described the second feedback channel, by the mode that does not retransmit enhancing information, retransmit.
9. method according to claim 8, wherein, a plurality of code blocks form the transmission block for transmitting, utilize the resulting re-transmission enhancing of despreading information to retransmit and comprise the bitmap sequence of the described code block carrying learns in described transmission block, which code block needs to retransmit from described re-transmission enhancing information, and retransmit accordingly.
10. method according to claim 9, also comprises,
Set up the corresponding relation between described primary feedback channel and described the second feedback channel.
11. methods according to claim 10, wherein, the described corresponding relation of setting up between primary feedback channel and described the second feedback channel comprises that to select many primary feedback channels corresponding with at least one the second feedback channels.
Method described in 12. according to Claim 8 to 11 any one, also comprises,
Pre-determine the frequency expansion sequence group that comprises described frequency expansion sequence;
For a frequency expansion sequence in frequency expansion sequence group described in each primary feedback channel allocation;
Between transmitter and receiver, share described frequency expansion sequence group and with the corresponding relation of primary feedback channel.
13. methods according to claim 12, wherein, the number of the size based on described sequence set and the primary feedback channel corresponding with described the second feedback channel, is the similar and different frequency expansion sequence of different primary feedback channel allocation.
14. methods according to claim 13, wherein, described sequence is semi-orthogonal sequence or orthogonal sequence.
15. 1 kinds of transmitters, comprising:
Reception control unit, the feedback signal of the second feedback channel that is used for receiving primary feedback channel and is associated with described primary feedback channel, if find to carry in primary feedback channel, require the indication information retransmitting and in the second feedback channel being associated with primary feedback channel, carry the enhancing information that retransmits, indication retransmits according to the described re-transmission enhancing information of carrying in the second feedback channel, and wherein said re-transmission enhancing information is for improving the quality of reception of the signal being retransmitted or the information of transmission availability;
Retransmission unit, for retransmitting according to described indication;
Wherein, described reception control unit comprises:
Despreading module, for being used the signal that the frequency expansion sequence that is associated with primary feedback channel receives the second feedback channel to carry out despreading;
Measurement module, for measuring the Signal to Interference plus Noise Ratio SINR of the signal after the despreading of described despreading module;
Judging module, for working as, judge whether the SINR that described measurement module is measured is greater than predetermined threshold value, when described SINR is greater than predetermined threshold value, indication utilizes the resulting re-transmission enhancing of described despreading module despreading information to retransmit, otherwise abandon the signal receiving in described the second feedback channel, by the mode that does not retransmit enhancing information, retransmit.
16. transmitters according to claim 15, also comprise:
Channels associated unit, for setting in advance the corresponding relation between described primary feedback channel and described the second feedback channel, is used for described despreading module.
17. transmitters according to claim 16, also comprise:
Frequency expansion sequence processing unit, for pre-determining frequency expansion sequence group, for each main HARQ feedback channel distributes a frequency expansion sequence in described frequency expansion sequence group, is used for described despreading module.
18. 1 kinds of receivers, comprising:
Sending controling unit, for receiving from the signal of transmitter and judging whether to need to retransmit, the indication information that whether feedback needs transmitter to retransmit in primary feedback channel, if needed, retransmit, in the second feedback channel being associated with primary feedback channel, feedback retransmits enhancing information, and described re-transmission enhancing information is for improving the quality of reception of the signal being retransmitted or the information of efficiency of transmission;
Feedback unit: for feeding back according to described indication;
Described receiver also comprises:
Spectrum-spreading unit, for being used the frequency expansion sequence being associated with described primary feedback channel to carry out spread spectrum to described re-transmission enhancing information;
The re-transmission that described sending controling unit indication is fed back after described spread spectrum in the mode of competition in the second feedback channel being associated with described primary feedback channel strengthens information.
19. receivers according to claim 18, also comprise
Channels associated unit, for setting in advance the corresponding relation between described primary feedback channel and described the second feedback channel, is used for described sending controling unit.
20. receivers according to claim 19, also comprise:
Frequency expansion sequence processing unit, for pre-determining frequency expansion sequence group, for each main HARQ feedback channel distributes a frequency expansion sequence in described frequency expansion sequence group, is used for described spectrum-spreading unit.
21. 1 kinds of systems for retransmitting, comprise transmitter as described in claim 15 to 17 any one and according to claim 18 to the receiver as described in 20 any one.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| PCT/CN2009/000386 WO2010115295A1 (en) | 2009-04-10 | 2009-04-10 | Method for requesting retransmission, method for retransmission and devices thereof |
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| Publication Number | Publication Date |
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| CN102318254A CN102318254A (en) | 2012-01-11 |
| CN102318254B true CN102318254B (en) | 2014-08-13 |
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| CN102318254A (en) | 2012-01-11 |
| WO2010115295A1 (en) | 2010-10-14 |
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