CN101005342B - Sub-band mapping method and device for multiple carrier system - Google Patents
Sub-band mapping method and device for multiple carrier system Download PDFInfo
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Abstract
The method includes steps: transmit party obtains each sub band used by user when automatic mixed retransmission; determining overlapped sub bands between each sub band between original transmission and retransmission; when retransmission, replacing data blocks of original data stream in overlapped sub band to mapping position of sub band to make mapped positions from data blocks of original data stream to sub bands are total different or partial different between retransmission and original transmission. The invention also discloses device for mapping sub bands in automatic mixed retransmission of multicarrier system. The invention makes each data block in same original data blocks traverse all sub bands of the user as far as possible so as to guarantee uniform block error performance of each data block in original bit stream received by receiving end in order to raise system performance.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of multicarrier system sub-band mapping method and device.
Background technology
In order to adapt to the multimedia service needs growing to high speed data transfer, 3GPP (3G (Third Generation) Moblie collaborative project group) has introduced a kind of new high speed data transfer technology, i.e. HSDPA (high speed downlink packet access) technology.HSDPA is the set of some wireless enhanced technology, utilizes the HSDPA technology to fall behind on the basis in prior art the downlink data peak rate is improved a lot.From technical standpoint, HSDPA mainly is that introducing AMC (Adaptive Modulation and Coding) and HARQ (mixing automatic repeat requests) technology increase data throughout.
Present 3GPP (third generation partnership project) is also studying the wireless communication system based on the multicarrier of OFDM (OFDM).In multicarrier system, in order to improve systematic function, can follow the way of HSDPA system equally, adopt scheduling, link adaptation techniques such as AMC, HARQ.
With the down link adaptive process is example, and whole down link self adaption process is as follows: UE records channel condition by down public guide frequency; UE is to base station feedback CQI (channel quality indication) information then; The base station is according to each user's of receiving CQI information, and with reference to the QoS (service quality) of their downlink transfer business, carries out the selection (AMC) of running time-frequency resource scheduling and modulation coding mode; User's the resource allocation information of the service that will receive and modulation coding mode etc. are assigned in the base station by descending shared control signal channel, simultaneously, the base station is according to the resource and the transmission means of scheduling result indication, and transmission corresponding downstream data are given the user who picks out; UE demodulation descending shared control signal channel if discovery is the indication information to oneself, then carries out demodulation by the respective transmissions form to downlink data in the relevant position according to the requirement of wherein downlink resource indication; If correct to the data demodulation, then UE is to base station feedback ACK information, and simultaneously, UE measures and to the new CQI information of base station feedback, begins next link circuit self-adapting process; If demodulation mistake, then UE is to the base station feedback nack message, simultaneously, UE measures and to the new CQI information of base station feedback again, the base station retransmits according to new CQI information then, until UE receive correct till, if UE still can not correctly receive when surpassing maximum retransmission, then this packet is transferred to high-rise the processing.
By above-mentioned description to the link circuit self-adapting process as can be known, the principle of AMC is according to adaptive change modulation of the channel condition of reality and coded system.Guaranteeing that good user can adopt high order modulation and higher code rate to channel condition under the identical situation of receiving terminal BLER (Block Error Rate), the user of bad channel conditions then can only adopt low-order-modulated and lower code rate.Not only can adopt different MCS (Modulation and Coding Scheme) for the different user of channel condition, for the shared a plurality of different time of same user, also can be according to the different mining of channel condition with different MCS.The benefit of AMC just is can improve user's data speed when channel condition is better, thereby improves the average throughput of sub-district, and it belongs to a kind of link circuit self-adapting mode of dominance.
HARQ then belongs to a kind of link circuit self-adapting mode of recessiveness.Because the precision of channel measurement is limited and have a factor such as CQI feedback delay, the MCS that AMC self can not complete realistic channel condition selects.And HARQ can spontaneously adapt to instantaneous channel conditions, and insensitive to channel measurement sum of errors CQI feedback delay.Therefore, need HARQ mechanism and AMC scheme to combine.AMC provides the data rate of coarseness to select, and HARQ then carries out fine tuning according to the channel condition of reality to data speed.In the HARQ process, the base station determines whether retransmitting according to the physical layer confirmation that UE sends.If ACK indicates that then UE correctly receives data, need not to retransmit; If NACK then needs to retransmit merging.
HARQ process and AMC mode are closely related, and the two acting in conjunction cooperatively interacts, and just can better improve systematic function.
According to the implementation difference of AMC, mainly there are following two kinds of adaptive modulation and coded system at present:
1. code rate that each subband is unified and order of modulation
As shown in Figure 1, be assumed to be certain user and distributed 2 subbands, in certain TTI (Transmission Time Interval), this user measures and estimates the average CQI of these 2 subbands and report the base station.The base station is according to average CQI value, (combination by certain order of modulation and code rate in real system embodies to determine the average MCS grade of two subbands, each MCS grade correspondence a modulating-coding combination, the height of MCS grade has directly determined the data rate that each subband can be supported, also be the maximum original information bits number that can carry on each subband), carry out unified chnnel coding and modulation then, then with the branches such as data symbol after the coded modulation be mapped on each subband.In this AMC scheme, on each subband, all adopt identical MCS grade, each subband has identical data rate, as shown in Figure 1, the original data bits number that carries on each subband equates that (in fact the original bit stream in this example is equivalent to comprise two equal-sized data blocks, the data block here is at each subband, a subband can the data block transmitted size be certain according to its channel condition, as not adding explanation, mentioned data block all is meant the original bit that a subband can transmit at most later on).
The advantage of this scheme is that a plurality of subbands only need report an average CQI, can significantly reduce CQI feedback signaling amount.Yet in the reality, even if adjacent several subbands, the channel condition of each subband still can there are differences, and this AMC scheme has exactly been ignored this species diversity, therefore the BLER performance unanimity of the data block that passes that is to say the data in the same original bit stream, its BLER performance difference in can not each subband of strict guarantee, influence the decoding performance of receiving terminal to a certain extent, and then can influence systematic function.
2. the code rate that each subband is unified and each subband order of modulation independently
In this scheme, unified coding and unified rate-matched are carried out to all subband unifications in the base station, and this point is identical with the way of scheme 1; And when modulating, then carry out independently data-modulated of each subband according to the channel condition of each subband again.In this AMC scheme, because the modulation system on each subband is different, so the data rate that each subband can be supported also is not quite similar.When carrying out the CQI feedback, UE need report the order of modulation of a unified code rate and each subband to the base station.Compare with prior art 1, the difference of this scheme by order of modulation embodies the difference between each subband, can improve on the performance, yet its signaling amount is also bigger.And have only when the intersubband bad channel conditions is not big and could reflect by the difference of order of modulation, when the intersubband bad channel conditions is not little, what most of probably subbands adopted is identical order of modulation, therefore, only by changing the difference that order of modulation still can not demonstrate fully intersubband.
Summary of the invention
The purpose of this invention is to provide a kind of multicarrier system sub-band mapping method, with solve prior art can not each subband of strict guarantee in the Block Error Rate performance unanimity of the data block that passed, influence the shortcoming of receiving terminal decoding performance, the mistake piece performance that guarantees each data block in the receiving terminal original bit stream to greatest extent is identical, improves systematic function.
Another object of the present invention provides a kind of multicarrier system subband mapping device, to improve multicarrier system link circuit self-adapting performance.
For this reason, the invention provides following technical scheme:
A kind of multicarrier system is mixed sub-band mapping method in the automatic retransmission processes, said method comprising the steps of:
A, transmit leg obtain and mix each subband that the user uses when retransmitting automatically;
B, the equitant subband of all subbands when just passing with this user data in each subband when determine retransmitting;
C, when transposing retransmits with just pass in the equitant subband in the original data stream data block to the mapping position of subband, make when retransmitting in the original data stream data block different wholly or in part to the mapping position of subband with first biography;
In D, the user uses when according to the mapping relations after the transposing data block in the data retransmission stream being mapped to described mixing and retransmitting automatically each subband.
Described step C is specially:
When the data rate on the described equitant subband is identical, when all or part of transposing retransmits in the equitant subband in the original data stream data block to the mapping position of subband.
Described step C is specially:
Data rate on described equitant subband not simultaneously, when part transposing retransmits in the equitant subband in the original data stream data block to the mapping position of subband.
According to the data rate that each subband in the described equitant subband can be supported, will support a part of data block on the higher subband of data rate to be transposed on the lower subband of support data rate.
Alternatively, when described equitant subband has when a plurality of, all or part of subband mapping mode of taking to circulate is changed in the equitant subband in the original data stream data block to the mapping position of subband when each the re-transmission.
Alternatively, when described equitant subband has when a plurality of, all or part of subband mapping mode of taking is at random changed in the equitant subband in the original data stream data block to the mapping position of subband when each the re-transmission.
Alternatively, when described equitant subband has when a plurality of, all or part of taking changed in the equitant subband in the original data stream data block to the mapping position of subband by the mapping mode that predetermined rule changes when each the re-transmission.
Alternatively, if described equitant subband has only two, then when each the re-transmission, data block in the original data stream to the mapping position of subband is exchanged.
Described method further comprises:
When the sub band resources of using as described user is distributed on a plurality of different physical antennas and/or the virtual-antenna, when transposing retransmits in the original data stream data block to the same antenna different sub-band and/or different antennae on the mapping position of subband.
When alternatively, described transposing retransmits in the original data stream step of data block mapping position of subband to the different antennae comprise:
Different antennae change and/or different antennae on intersubband change.
Alternatively, when changing in the equitant subband data block in the original data stream to the mapping position of subband, directly the data block in the original data stream is changed when subband shines upon, perhaps data block is carried out data symbol corresponding after the coded modulation and when subband shines upon, change.
A kind of multicarrier system is mixed subband mapping device in the automatic retransmission processes, comprising:
Send the data flow extraction unit, be used to obtain the data flow that needs send;
Retransmit the subband selected cell, be used to obtain each sub-band information that distributes for the user when retransmitting;
The subband map unit, the data block that is used for data flow that needs are sent is mapped in each subband that distributes into the user;
Also comprise:
Just pass the sub-band information memory cell, be used to store each sub-band information that the user uses when just passing;
Comparing unit is each sub-band information that described user distributes equitant subband of all subbands when each subband just passes with this user data when determining to retransmit when being used for according to described each sub-band information that the user uses when just passing and described re-transmission;
The transposing unit is coupled in described comparing unit respectively, just passes sub-band information memory cell and subband map unit, when being used for according to described mapping relations that transposing retransmits with just pass in the equitant subband original data stream data block to the mapping position of subband.
Described transposing unit comprises:
Transposing strategy generates subelement, be used for according to described when data block uses when just passing the mapping relations of subband to determine to retransmit in user's original data stream when just passing first biography that the sub-band information memory cell stores with just pass in the equitant subband in the original data stream data block to the transposing strategy of the mapping position of subband;
Mapping relations generate subelement, are used for setting up the mapping relations of re-transmitting data block to subband according to described transposing strategy.
By above technical scheme provided by the invention as can be seen, the present invention is for the unified AMC mode of each subband, retransmit in the HARQ process with first biography and utilize identical subband and MCS grade or retransmit and just pass the subband that takies when overlapping, by when retransmitting, adopting different subband mapping modes, that is: the subband position of each data block correspondence in the transposing original data stream, make each data block in the same original data stream all travel through all subbands of distributing to this user as far as possible, thereby play the effect of channel condition equalization, the BLER performance that guarantees each data block in the receiving terminal original bit stream to greatest extent is identical, thereby has improved systematic function effectively.
Unified but carry out the AMC mode of separate modulation for each sub-band coding speed, utilize identical subband and code rate or retransmit the subband that takies with first biography when overlapping when retransmitting and just passing, the corresponding subband position of a part by data block in the transposing original data stream when retransmitting or data block, make each data block in the same original data stream all travel through all subbands of distributing to this user as far as possible, thereby play the effect of channel condition equalization, the BLER performance that guarantees each data block in the receiving terminal original bit stream to greatest extent is identical, has improved systematic function effectively.
Description of drawings
Fig. 1 is each subband is unified in the prior art the code rate and the link circuit self-adapting mode schematic diagram of order of modulation;
Fig. 2 is the schematic diagram of subband in the ofdm system;
Fig. 3 is the realization flow figure of the inventive method;
Fig. 4 is that first of the inventive method is used example;
Fig. 5 is that second of the inventive method is used example;
Fig. 6 is the schematic diagram that adopts the subband support data rate of Unified coding speed and different modulating mode;
Fig. 7 is that the 3rd of the inventive method is used example;
Fig. 8 is that the 4th of the inventive method is used example;
Fig. 9 is an allocation of subbands schematic diagram in the multiaerial system;
Figure 10 is the subband mapping schematic diagram that HARQ retransmits in the multiaerial system;
Figure 11 is the theory diagram of apparatus of the present invention.
Embodiment
Core of the present invention is at synchronous HARQ and satisfies in the asynchronous HARQ process of certain condition, the HARQ process that the subband that adopts same sub-band or re-transmission and first biography to take for re-transmission and first biography overlaps, change the subband mapping mode in the retransmission processes, make a plurality of data blocks in the original bit stream when just passing and retransmitting at every turn, all travel through all subbands as far as possible, reach the effect of equalization.Particularly, for the unified AMC mode of each subband, retransmit in the HARQ process with just passing to utilize identical subband and MCS grade or retransmit and just pass the subband that takies and overlap, the subband position of each data block correspondence in the transposing original data stream when retransmitting makes each data block in the same original data stream all travel through all subbands of distributing to this user as far as possible; Unified but carry out the AMC mode of separate modulation for each sub-band coding speed, retransmit with just passing to utilize identical subband and code rate or retransmit and just pass the subband that takies and overlap, the corresponding subband position of a part of the data block when retransmitting in the transposing original data stream makes each data block in the same original data stream all travel through all subbands of distributing to this user as far as possible.
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with drawings and embodiments.
The present technique field personnel know, in OFDM (OFDM) system, when carrying out scheduling of resource, the resource of distributing to the user is unit with the subband, subband is a time-frequency two-dimensional, takies the subcarrier of partial continuous on frequency domain, takies the continuous OFDM symbol of certain-length in time, the size of subband is to be decided by continuous sub-carriers number and continuous OFDM symbolic number, the size of subband be come by the specific design of system fixed.
The schematic diagram of subband is as shown in Figure 2:
Wherein, each lattice is a time frequency unit, and a subband is to be made of many time frequency unit, and the time frequency unit position is with (k, t represent respectively on k subcarrier and t OFDM symbol of time frequency unit in this subband for k, t) expression in the subband.Each user feeds back to the base station with CQI then by the channel condition that measures of public guide frequency, and scheduling of resource is carried out to each user of feedback CQI in the base station, resource by distributing to the user after the scheduling is exactly some subbands, these subbands can be continuous, or discrete, for example subband 1,2 give same user, or subband 1,3 gives same user, or subband 1,2,4 give same user.
The link circuit self-adapting process comprises AMC and HARQ process usually simultaneously, and AMC provides the data rate of coarseness to select, and HARQ then carries out fine tuning according to the channel condition of reality to data speed.
In the HARQ process, if the user to data demodulation mistake then send nack message to the base station, the base station need retransmit data block.Can adopt subband identical when just passing during re-transmission and continue to use MCS grade when just passing.For example:
When adopting synchronous HARQ, the MCS grade when re-transmission will take identical subband and continue to use first the biography with first biography.
When adopting asynchronous HARQ, compare,, also can take identical subband during re-transmission and continue to use MCS grade when just passing with first biography if changes in channel conditions is little when retransmitting with first biography; If the changes in channel conditions when retransmitting is big slightly, can partly change subband when then retransmitting, subband shared when promptly retransmitting overlaps with first the biography; Certainly, great changes have taken place if the channel condition when retransmitting is compared during with first biographys, need adopt when then retransmitting and first different subband during biography, promptly redistributes subband according to new CQI value of feedback and be used for re-transmission.
So-called synchronous HARQ is meant that the time relationship of first transmission and re-transmission fixes, so emission mechanism need be the moment that a code block is selected first transmission, and then follow-up re-transmission must occur in and just pass the moment with Fixed Time Interval.For example, the feedback delay of establishing the NACK signaling is (N-1) individual time slot, if first transmission occurs in i time slot, then retransmits and must occur in (i+N) individual time slot, if retransmit failure, then retransmits next time and occurs in (i+2N) individual time slot, and the rest may be inferred.Retransmit modulation coding mode identical when all adopting at every turn, and take identical channel resource with first the biography.The advantage of synchronous HARQ need not transmission user ID (sign) and channel id again when being to retransmit, significantly reduced the control signaling amount; Its shortcoming is the effect that can not demonstrate fully multi-user diversity.
So-called asynchronous HARQ is meant that re-transmission takes place constantly and first biography of discord has fixed relationship constantly, but select flexibly according to the situation of each user in the real network, compare with synchronous HARQ, in asynchronous HARQ process, can utilize multi-user diversity preferably, but the also corresponding increase of its control signaling amount.
The HARQ process that the subband that the present invention adopts same sub-band or re-transmission and first biography to take to re-transmission and first biography overlaps is improved, the subband mapping mode in the change retransmission processes.
With reference to Fig. 3, Fig. 3 shows the realization flow of the inventive method, may further comprise the steps:
Step 301: obtain and mix each subband that the user uses when retransmitting automatically.
The present technique field personnel know, in multicarrier system, a user's data can use a plurality of sub band resources to transmit.When data block just passed and retransmits, the base station need be returned the CQI (channel quality indication) of feedback according to UE, and with reference to the qos parameter of each user's downlink transfer business and the data volume that needs transmission, carried out the selection of running time-frequency resource scheduling and modulation coding mode.Certainly also comprise each sub band resources of coming thus to determine that the user uses, and as required, whole identical sub band resources when re-transmission can be used with first the biography; The identical resource of part that is to say in the time of also can using with first the biography, and subband can have overlapping when retransmitting with first biography.
Step 302: determine in each subband the equitant subband of all subbands when just passing, that is to say, retransmit and the identical subband that just passes use with this user data.
Step 303: when transposing retransmits in the equitant subband in the original data stream data block make when retransmitting in the original data stream data block different wholly or in part to the mapping position of subband to the mapping position of subband with first biography.
Can be all or part of transposing when retransmitting in the equitant subband in the original data stream data block to the mapping position of subband.
For multiaerial system, if the sub band resources that certain user uses is distributed on a plurality of different antennae, equally also can change when retransmitting the mapping position of the subband to the different antennae of data block in the original data stream, during specific implementation, can between different antennae, change, also can change, certainly, also can adopt part to carry out different antennae, part is carried out the mixing transposing of subband between antenna at the intersubband of different antennae.
No matter adopt the transposing of which kind of mode, all can directly the data block in the original bit stream when shining upon, be changed subband, corresponding data symbol is changed when subband shines upon after also data block can being carried out coded modulation, can both reach each data block that makes this user and all travel through all subbands as far as possible, thereby guarantee the identical purpose of BLER performance of each data block in the receiving terminal original bit stream to greatest extent.
Below the mapping mode of subband in the HARQ retransmission processes among the present invention for durther example details.
At first, in a single aerial system, transmit and receive and all adopt an antenna, the subband of distributing to the user is distributed on the antenna.Unified but carry out the AMC mode of separate modulation for the unified AMC mode of each subband or each sub-band coding speed, in the HARQ process, retransmit with just passing to utilize identical subband or retransmit and just pass the subband that takies and overlap, transposing subband when retransmitting, make each data block in the same original data stream all as far as possible traversal distribute to all subbands of this user.
With reference to Fig. 4, the figure shows under the unified AMC mode of each subband, retransmit and just pass the subband transposing mode in the HARQ retransmission processes that adopts same sub-band.
Suppose in certain HARQ process, adopt subband 1 and subband 2 and average MCS grade thereof when just passing, branch ground such as original data block transmit on two subbands (here in order to express easily, omitted code modulated step in Fig. 4 kind), sub-piece 1 is mapped on the subband 1, sub-piece 2 is mapped on the subband 2, and obviously, sub-piece 1 is identical with sub-piece 2 sizes.When retransmitting, still adopt subband 1 and subband 2 and average MCS grade thereof, but this moment, sub-piece 1 was mapped on the subband 2, sub-piece 2 is mapped on the subband 1, being about to two shared band resources of equal-sized sub-piece changes, thereby guarantee to travel through all subbands through each data block that one or many retransmits in the original bit stream of back, thereby make the channel condition equalization of the actual experience of each data block, guarantee that to greatest extent the BLER performance of each data block in the receiving terminal original bit stream is identical.During specific implementation, can directly two parts data block in the original bit stream be changed, also two parts data block can be carried out data symbol corresponding after the coded modulation and when subband shines upon, change.No matter which kind of mode can make each data block in the original bit stream travel through all subbands as much as possible.
Certainly, in most cases, more than two of the subband number that UE takies in a HARQ process.Situation for a plurality of subbands, can allow a plurality of data blocks in the original bit stream just pass and mode or other mapping modes that changes according to certain specific rule of take during each the re-transmission to circulate subband mapping or subband mapping at random, thereby make each data block all travel through all subbands as far as possible, reach the effect of equalization, so that guarantee that to greatest extent the BLER performance of each data block in the receiving terminal original bit stream is identical, improve systematic function.
With reference to Fig. 5, the figure shows under the unified AMC mode of each subband the subband transposing mode in the HARQ retransmission processes that the subband that re-transmission and first biography take overlaps.
Suppose in certain HARQ process, adopt subband 1, subband 2 and subband 3 and average MCS grade thereof when just passing, original data block is divided into trisection, on three subbands, transmit (here in order to express easily respectively, omitted code modulated step in Fig. 5 kind), sub-piece 1 is mapped on the subband 1, and sub-piece 2 is mapped on the subband 2, and sub-piece 3 is mapped on the subband 3.When retransmitting, adopt subband 1, subband 2 and subband 4 and average MCS grade thereof, as seen, subband 1 that adopts during re-transmission and subband 2 are overlapping during with first biography, carry out the transposing of parton interband this moment, soon data block transmitted (sub-piece 1 and sub-piece 2) is exchanged on subband 1 and the subband 2; The then transmission on new subband 4 of sub-piece 3 does not participate in the subband transposing.Thereby guarantee all can travel through all subbands as much as possible through each data block that one or many retransmits in the original bit stream of back, thereby make the channel condition equalization of the actual experience of each data block, guarantee that to greatest extent the BLER performance of each data block in the receiving terminal original bit stream is identical.During specific implementation, can directly two parts data block in the original bit stream be changed, also two parts data block can be carried out data symbol corresponding after the coded modulation and when subband shines upon, change.No matter which kind of mode can make each data block in the original bit stream travel through all subbands as much as possible.
Code rate for each subband is identical, but the different AMC modes of modulation system, though the difference of each subband can be embodied to a certain extent by modulation system, because each subband adopts unified code rate, thereby the difference of each subband does not fully obtain embodying.Utilize the inventive method, the BLER performance of each data block in the receiving terminal original bit stream can further be improved in the position of the subband of data block correspondence when adjusting HARQ and retransmitting.
It should be noted that owing to the modulation system difference on each subband, so the data rate that each subband can be supported is also different.As shown in Figure 6:
With reference to Fig. 7, it is unified but under the AMC mode that order of modulation is different, retransmit and just pass the subband transposing mode in the HARQ retransmission processes that adopts same sub-band to the figure shows each sub-band coding speed.
Suppose to have distributed two subbands at certain TTI (Transmission Time Interval) for certain user, the channel condition of subband 1 is better, carries out high order modulation, and the channel condition of subband 2 is relatively poor, carries out low-order-modulated.Shown in Fig. 7 (b), when retransmitting, a part of data on the subband 1 and the total data on the subband 2 are changed.In this embodiment, adopted the method for data block in the direct transposing original bit stream.Can certainly adopt the method for after coded modulation, changing, no longer describe in detail here.
Equally, situation for a plurality of subbands, can allow the part (normally for adopting the subband of high order modulation) of a plurality of full block of data (normally for adopting the subband of low-order-modulated) in the original bit stream or data block just pass and mode or other mapping modes that changes according to certain specific rule of take during each the re-transmission to circulate subband mapping or subband mapping at random, thereby make each data block all travel through all subbands as far as possible, reach the effect of equalization, although what this equalization was carried out is not very abundant, but still can bring certain system gain.
With reference to Fig. 8, it is unified but under the AMC mode that order of modulation is different to the figure shows each sub-band coding speed, retransmits and just pass the subband transposing mode in the HARQ retransmission processes that the subband that takies overlaps.
Suppose to transmit for the first time and distributed three subbands for certain user at certain TTI, the channel condition of subband 1 is better, carries out high order modulation, and the channel condition of subband 2 and subband 3 is relatively poor, carries out low-order-modulated.When retransmitting, still adopt subband 1 and subband 2, the subband 3 when just having replaced first the biography with subband 4; A part of data on the subband 1 and the total data on the subband 2 can be changed, the then transmission on new subband 4 of sub-piece 3 does not participate in the subband transposing.In this embodiment, adopted the method for data block in the direct transposing original bit stream.Can certainly adopt the method for after coded modulation, changing, no longer describe in detail here.
In multiaerial system, transmitting terminal and receiving terminal have many antennas respectively, if the AMC mode on each antenna is the same with the AMC mode of a single aerial system recited above, the subband transposing mode in the then above-mentioned HARQ retransmission processes is equally applicable to each transmitting antenna in the multiaerial system.
If each antenna adopts unified AMC and HARQ scheme in multiaerial system, promptly a data block is through being mapped to after CRC (cyclic redundancy check (CRC)), chnnel coding and the modulation on each subband on a plurality of antennas, and the subband of distributing to each user can be distributed on a plurality of antennas.
With reference to dual-antenna system shown in Figure 9, the running time-frequency resource of supposing to distribute to the user is a subband 1,2,3,4.Subband 1,2,3,4 on the antenna 1 and 2 is distributed to this user simultaneously, and promptly a user has taken 8 subbands altogether.
Like this, when retransmitting, the data block of the required transmission of this user can be changed between the different sub-band between different antennae or between different antennae, to improve systematic function.Below this is elaborated.
With reference to Figure 10, suppose that certain user is in certain HARQ process, first transmission is adopted successively is subband 1 on the antenna 1 and subband 1 and the subband 2 on subband 2 and the antenna 2, when then retransmitting, originally change transmission on the subband 2 at antenna 2 in the data on the subband 1 of antenna 1, originally the data in transmission on the subband 2 of antenna 1 change transmission on the subband 1 at antenna 2 into, originally the data in transmission on the subband 1 of antenna 2 change transmission on the subband 2 at antenna 1 into, originally the data in transmission on the subband 2 of antenna 2 change transmission on the subband 1 at antenna 1 into, through after such transposing, data during first the transmission in each subband have been passed through the different sub-band on the different antennae, because it is almost separate between the different sub-band on the different antennae, can obtain better diversity gain through such mapping, transposing when retransmitting certainly between the subband is flexibly, is not limited to top a kind of mode.Such as, can also carry out part transposing etc. to the subband on the different antennae, realize that principle and single antenna are similar, do not repeat them here.
Recited above is in retransmission processes the subband on the different physical antennas to be replaced, and the method also can be applied on the virtual-antenna.So-called virtual-antenna is meant after the enterprising line translation of physical antenna and obtains.As a multiaerial system four transmitting antennas are arranged, four reception antennas, then the channel of this system is a matrix H
4 * 4, with a matrix P
4 * m, 1≤m≤4 pair channel carries out conversion, promptly
Then claim
Be virtual multi-antenna channel, there are four reception antennas in this virtual system, and therefore m transmitting antenna just can carry out above-mentioned displacement between the subband of m virtual transmit antennas.
This shows, the present invention is in the first biography of HARQ and each time retransmission processes, make each data block in the same original data stream all travel through all subbands of distributing to this user as much as possible, the BLER performance that has guaranteed each data block in the receiving terminal original bit stream to greatest extent is identical, and then has improved systematic function.
With reference to Figure 11, Figure 11 is the theory diagram of apparatus of the present invention:
This device comprises: send data flow extraction unit S1, retransmit subband selected cell S2, just pass sub-band information memory cell S3, comparing unit S4, transposing cell S 5 and subband map unit S6.
When the application apparatus of apparatus of the present invention is launched data for the first time, just pass also each sub-band information of using of storage user of sub-band information memory cell S3 record, comprise subband numbering, subband data carried by data speed, the information such as mapping relations of data block use subband when just passing in user's original data stream when just passing; When the original data stream when passing originally need retransmit, obtaining when retransmitting by re-transmission subband selected cell S2 was each sub-band information that the user distributes.At this moment be not as prior art, data retransmission stream to be mapped directly in each subband that distributes into this user, but whether have overlapping according to the subband that retransmits with just passing distribution, and the whether equal mutually information of the data rate on the lap subband when retransmitting with just pass in the equitant subband in the original data stream data block to the mapping position of subband and carry out certain transposing, distribute to all subbands of this user so that each data block in the same original data stream all travels through as much as possible, thereby play the effect of channel condition equalization.
For this reason, the equitant subband of all subbands when just passing with this user data in each subband when at first each sub-band information that is used by comparing unit S4 user when just passing and each sub-band information of distributing for this user when retransmitting are determined re-transmission, and then by transposing cell S 5 when just passing first biography of storing among the sub-band information memory cell S3 in user's original data stream data block use the mapping relations of subband when just passing, when transposing retransmits with just pass in the equitant subband in the original data stream data block to the mapping position of subband.
When 5 pairs of cell S of transposing retransmit with pass just in the equitant subband that data block can have multiple mode in the original data stream when the mapping position of subband is changed, such as, can set in advance and store some transposing strategies, allow a plurality of data blocks in the original bit stream just pass and adopting during each the re-transmission mapping of circulation subband or subband mapping or other are changed according to mapping policys that certain particular specification changes at random; The transposing strategy also can be set in transposing cell S 5 generate subelement S51 and mapping relations generation subelement S52.
When transposing strategy generates subelement S51 according to first biography that just pass sub-band information memory cell S3 storage in user's original data stream data block use the mapping relations of subband and the equitant sub-band information of comparing unit S4 output to generate corresponding transposing strategy when just passing, and then generate subelement S52 according to the tactful mapping relations of re-transmitting data block of setting up of this transposing to subband by mapping relations.
Extract the data flow that needs transmission by sending data flow extraction unit S1, generate the mapping relations of the re-transmitting data block of subelement S52 foundation by subband map unit S6 according to mapping relations, these data flow are mapped in the required subband of the definite data retransmission of re-transmission subband selected cell S2 to subband.
Send data flow extraction unit S1 and can directly extract data block in the original data stream, also can extract data block is carried out corresponding data symbol after the coded modulation.
Apparatus of the present invention are applied to can improve the adaptivity of downlink link and up transmitting chain effectively in base station or UE (subscriber equipment) system, and then improve UE and base station decoding performance to received signal.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (13)
1. a multicarrier system is mixed sub-band mapping method in the automatic retransmission processes, it is characterized in that, said method comprising the steps of:
A, transmit leg obtain and mix each subband that the user uses when retransmitting automatically;
B, the equitant subband of all subbands when just passing with this user data in each subband when determine retransmitting;
C, when transposing retransmits with just pass in the equitant subband in the original data stream data block to the mapping position of subband, make when retransmitting in the original data stream data block different wholly or in part to the mapping position of subband with first biography;
In D, the user uses when according to the mapping relations after the transposing data block in the data retransmission stream being mapped to described mixing and retransmitting automatically each subband.
2. method according to claim 1 is characterized in that, described step C is specially:
When the data rate on the described equitant subband is identical, when all or part of transposing retransmits in the equitant subband in the original data stream data block to the mapping position of subband.
3. method according to claim 1 is characterized in that, described step C is specially:
Data rate on described equitant subband not simultaneously, when part transposing retransmits in the equitant subband in the original data stream data block to the mapping position of subband.
4. method according to claim 3 is characterized in that,
According to the data rate that each subband in the described equitant subband can be supported, will support a part of data block on the higher subband of data rate to be transposed on the lower subband of support data rate.
5. according to claim 2 or 4 described methods, it is characterized in that,
When described equitant subband has when a plurality of, all or part of subband mapping mode of taking to circulate is changed in the equitant subband in the original data stream data block to the mapping position of subband when each the re-transmission.
6. according to claim 2 or 4 described methods, it is characterized in that,
When described equitant subband has when a plurality of, all or part of subband mapping mode of taking is at random changed in the equitant subband in the original data stream data block to the mapping position of subband when each the re-transmission.
7. according to claim 2 or 4 described methods, it is characterized in that,
When described equitant subband has when a plurality of, all or part of taking changed in the equitant subband in the original data stream data block to the mapping position of subband by the mapping mode that predetermined rule changes when each the re-transmission.
8. method according to claim 2 is characterized in that,
If described equitant subband has only two, then when each the re-transmission, data block in the original data stream to the mapping position of subband is exchanged.
9. method according to claim 1 is characterized in that, described method further comprises:
When the sub band resources of using as described user is distributed on a plurality of different physical antennas and/or the virtual-antenna, when transposing retransmits in the original data stream data block to the same antenna different sub-band and/or different antennae on the mapping position of subband.
10. method according to claim 9 is characterized in that, when described transposing retransmits in the original data stream step of data block mapping position of subband to the different antennae comprise:
Different antennae change and/or different antennae on intersubband change.
11. according to claim 1 to 4 or 9 to 10 each described methods, it is characterized in that,
When changing in the equitant subband data block in the original data stream to the mapping position of subband, directly the data block in the original data stream is changed when subband shines upon, perhaps data block is carried out data symbol corresponding after the coded modulation and when subband shines upon, change.
12. a multicarrier system is mixed subband mapping device in the automatic retransmission processes, comprising:
Send the data flow extraction unit, be used to obtain the data flow that needs send;
Retransmit the subband selected cell, be used to obtain each sub-band information that distributes for the user when retransmitting;
The subband map unit, the data block that is used for data flow that needs are sent is mapped in each subband that distributes into the user;
It is characterized in that, also comprise:
Just pass the sub-band information memory cell, be used to store each sub-band information that the user uses when just passing;
Comparing unit is each sub-band information that described user distributes equitant subband of all subbands when each subband just passes with this user data when determining to retransmit when being used for according to described each sub-band information that the user uses when just passing and described re-transmission;
The transposing unit, be coupled in described comparing unit respectively, just pass sub-band information memory cell and subband map unit, be used for according to described when data block uses when just passing the mapping relations transposing of subband to retransmit in user's original data stream when just passing first biography that the sub-band information memory cell stores with just pass in the equitant subband in the original data stream data block to the mapping position of subband.
13. device according to claim 12 is characterized in that, described transposing unit comprises:
Transposing strategy generates subelement, when being used for determining to retransmit according to described mapping relations with just pass in the equitant subband original data stream data block to the transposing strategy of the mapping position of subband;
Mapping relations generate subelement, are used for setting up the mapping relations of re-transmitting data block to subband according to described transposing strategy.
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| CN101635616B (en) * | 2008-07-23 | 2012-10-10 | 中兴通讯股份有限公司 | Method for synchronous hybrid automatic retransmission |
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| CN101924609B (en) * | 2009-06-12 | 2013-03-13 | 中国移动通信集团公司 | Processing method of uplink data in coordinated multipoint transmission and related device |
| CN102111885A (en) * | 2009-12-23 | 2011-06-29 | 电信科学技术研究院 | Method and device for determining and adjusting encoded mode |
| CN111934832B (en) * | 2016-07-15 | 2021-10-26 | 华为技术有限公司 | Method and device for transmitting signals based on multiple channels |
| WO2018027589A1 (en) * | 2016-08-09 | 2018-02-15 | 华为技术有限公司 | Data transmission method, data transmission apparatus, and communications system |
| CN110402597A (en) * | 2017-03-15 | 2019-11-01 | 高通股份有限公司 | The method for being used to indicate the mapping of PDSCH/PUSCH resource element |
| CN114978442A (en) * | 2021-02-19 | 2022-08-30 | 华为技术有限公司 | Resource mapping method and device |
| WO2023206132A1 (en) * | 2022-04-27 | 2023-11-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Network deployment based on partially overlapped carriers |
| CN116760512B (en) * | 2023-08-17 | 2023-11-17 | 上海朗力半导体有限公司 | HARQ retransmission control method and device for Multi-Link |
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