CN100586052C - Method and system for transmitting data - Google Patents
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Abstract
The invention is concerned with the data transmission method and the system, it is: the user's terminal or the base station as the sending side, the corresponding base station or the user's terminal as the receiving side, the sending side process code for the information bit in order to get the code block number equal with the biggest resend time, the sending side divides the code block number into at least two groups, and at least the first group includes two code block; sets the transmission time slot of each code block in the group, and sends to the receiving side; the receiving side receives code block and decode, after receiving a group of code block, if the decode is still incorrect, feedbacks once NACK. The invention can reduce the feedback signaling overhead effectively, improve the utilance of the channel resource.
Description
Technical field
The present invention relates to wireless communication technology, relate in particular to the adaptive wireless transmission technology in the wireless communication field.
Background technology
Growing along with the high-speed multimedia data business demand, radio communication requires wideer band resource to satisfy the transmission of broadband data service, and the finiteness of band efficiency becomes the bottleneck of restriction broadband data service development, therefore how on limited bandwidth, to improve message transmission rate to greatest extent, just how to improve band utilization efficient to greatest extent and become one of key link of 3G (Third Generation) Moblie and future communications system.Simultaneously, to the demand of high-speed multimedia business, impel mobile radio system to adopt new technology to improve transmission rate and power system capacity.
Actual radio communication channel has two big characteristics: time-varying characteristics and fading characteristic.Time-varying characteristics are by the relative motion between terminal, reflector, the scattering object or only are because the slight change of transmission medium causes.Therefore, the stochastic variable that becomes when the channel capacity of wireless channel also is will maximally utilise channel capacity, and one of method is that to make transmission rate also be an amount with the channel volume change.Under this background, adaptive technique more and more is applied in the middle of the evolution transmission plan and the system in future of 3-G (Generation Three mobile communication system).For wireless communication system, its channel conditions, type of service, professional distribution meeting in time, the variation in space and changing, adopt the adaptive technique system that can make more flexibly and to carry out the self adaptation adjustment according to these variations intelligently, to improve transmission quality, increase power system capacity.In general, this adaptive strategy is divided into adaptive wireless resource management and adaptive wireless transmission technology two big classes.
For adapting to the mobile radio system high performance requirements, the technology for self-adaptively transmitting that can Gong adopt mainly concentrates on physical layer (PHY) and medium Access Layer (MAC).Mainly contain the space diversity reception to communicate of traditional diversity technique and the many antennas of employing in physical layer, comprise mainly that at the medium Access Layer link adaptation technology is adaptive coding modulation (AMC, Adaptive Modulation and Coding) and the link retransmission technique be automatic repetitive requests technology (ARQ, Automatic Repeat request).
The basic principle of AMC technology is the form that changes modulation and coding, it is adapted with channel condition in the system constraint scope, channel condition then can be estimated by sending feedback, promptly determine the capacity of current channel according to the situation of channel, determine suitable code modulation mode etc. according to capacity, so that send information to greatest extent, realize than higher speed.The AMC technology mainly comprises RCPT (Rate CompatiblePuncturing Turbo codes) and high order modulation (MSPK ﹠amp; M-QAM) combination, mixing automatic repeat requests HARQ (Hybrid Automatic Repeat request) and mimo antennas (MIMO, Multiple-Input Multiple-Out-put) etc.In the AMC system, generally use the modulation system of higher-order and higher code rate under the situation preferably at channel condition, and at the next modulation coding mode with lower-order of the not so good situation of channel condition.
The AMC technology is to remain unchanged in the transmitting power of supposing modulation symbol, use power control to make the average power often of received signal remain unchanged under the situation in receiving terminal hypothesis, only according to different channel conditions, select different modulation systems, make the rate adaptive transmission ground of information data adjust, to be implemented under the prerequisite of keeping the certain QoS requirement, improve the technology of hardware circuit solution and average transmission rate.
The ARQ technology also is a kind of technology of link circuit self-adapting, is meant by retransmitting to guarantee the reliability transmitted, and is current when once attempting bust this, just requires the transmission mechanism of retransmission data packet may.The communication link that has the ARQ technology generally all is a closed loop link, has a feedback answer signal ACK (ACKnowledgement) ﹠amp; NACK (Negative ACKnowledgement).Main ARQ technology has the re-transmission of selection (SR, Selective Repeat) and stops to wait for re-transmission (SAW, Stop And Wait) two kinds at present.
HARQ is with forward error correction coding (FEC, Forward Error Correction) and the technology that combines of ARQ, be in the ARQ system, to introduce the FEC subsystem, the FEC subsystem is used to correct the error pattern of frequent appearance, to reduce the number of times that retransmits, feasible only in few error pattern ability request retransmission that occurs, promptly increase the efficiency of transmission that system reliability has increased system again.
The advantage of FEC communication system is to have only a channel, and the efficiency of transmission height of system, equals bit rate, and is irrelevant with the error rate of channel.Yet FEC also has some shortcomings: when decoding error, the information of mistake is also given user terminal, so the reliability of FEC communication system is not high.The ARQ communication system is come compared with the FEC communication system, and equipment is simple, the reliability height, but it must be provided with a backward channel, and when channel degenerated (too big as error rate), system made efficiency of transmission very low owing to often being in solicited status.
So just constitute the HARQ communication system when they are combined, then when containing the check bit of error correction and error detection in each packet that sends in the HARQ communication system, if receive and to make mistakes bit number within error correcting capability in the bag, then wrongly corrected voluntarily; When mistake is serious, when having exceeded the error correcting capability of FEC, then allow the repeating transmission of making a start.The HARQ variation of adaptive channel condition automatically and insensitive to measure error and time delay, the reliability of HARQ communication system is than FEC system height like this, and efficiency of transmission is than ARQ system height.。
And the two combines and more can obtain best effect: AMC and provide rough data rate to select as AMC and HARQ, and HARQ can carry out meticulousr adjustment to data speed according to the data channel condition.
In the existing HARQ technical scheme, SAW is the simplest a kind of HARQ form, and required overhead is very little.In SAW, transmit leg only just begins next code block is operated after the code block that sends is correctly received, and the recipient is used for the bit of affirmation information (ACK or NACK) use whether the designation data piece is correctly decoded.But there is a main shortcoming in SAW: confirmation is untimely, and transmit leg must be waited for before sending next code block and receive the confirmation message.During wait acknowledge information, channel is in the free time, and system capability has been wasted.
N-channel-SAW-HARQ carries out the HARQ process of N SAW simultaneously side by side on a channel, when down link is used to transmit code block by certain HARQ process, up link is used to transmit the affirmation information of other HARQ processes, system resource is fully utilized like this, but at this moment just requires the recipient must be able to store the information of N data block.
Another kind of prior art scheme, as shown in Figure 1, time, shared system resource and modulating-coding form that scheduler determines to send certain user terminal data according to relevant information and some other principle of channel condition, transmit leg is encoded to information bit 11 according to the modulating-coding form that should determine, form the code block 12,13,14,15 that equates with maximum retransmission, wherein every channel code quantity that is comprised equates, code block 12 comprises whole raw information, and follow-up code block 13,14,15 may comprise raw information.
Transmission first, time, shared system resource and modulating-coding form that scheduler is determined transmission code block 12 according to variation and some other principle of channel condition, scheduler sends to transmit leg with scheduling result, and transmit leg only transmits code block 12 according to scheduling result;
The recipient receives and decoding obtains data block 121, if the recipient fails to be correctly decoded, then to scheduler feedback NACK100 and channel condition, time, shared system resource and modulating-coding form that scheduler is determined transmission code block 13 according to variation and some other principle of channel condition, scheduler sends to transmit leg with scheduling result, and transmit leg sends code block 13 according to scheduling result;
The recipient receives and decoding obtains data block 131, the recipient merges data block 131 and the data block 121 that decoding before this obtains again, be correctly decoded if fail, then to scheduler feedback NACK101 and channel condition, time, shared system resource and modulating-coding form that scheduler is determined transmission code block 14 according to variation and some other principle of channel condition, scheduler sends to transmit leg with scheduling result, and transmit leg sends code block 14 according to scheduling result;
The recipient receives and decoding obtains data block 141, the recipient merges data block 141 and the data block 121,131 that decoding before this obtains again, be correctly decoded if fail, then to scheduler feedback NACK102 and channel condition, time, shared system resource and modulating-coding form that scheduler is determined transmission code block 15 according to variation and some other principle of channel condition, scheduler sends to transmit leg with scheduling result, and transmit leg sends code block 15 according to scheduling result;
The recipient receives and decoding obtains data block 151, the recipient merges data block 151 and the data block 121,131,141 that decoding before this obtains again, if be correctly decoded, to the scheduler feeding back ACK, this DTD then, remaining do not have the code block of transmission to abandon; If the recipient is not correctly decoded, then to scheduler feedback NACK, transmitting time, shared system resource and modulating-coding form that scheduler is determined next code block according to variation and some other principle of channel condition again, scheduler sends to transmit leg with scheduling result, transmit leg sends next code block according to scheduling result, up to reaching maximum retransmission, this end of transmission.
In above-mentioned transmission course, after the code block behind the coding has all passed,, can guarantee under current channel condition that then the transmission of very big probability is correct if bit rate is consistent with selected modulating-coding form.But, when a few block code piece that begins to transmit, because coded format is far above actual demand, so it is less to transmit correct possibility, just before recipient's feedback several times, be that the probability of NACK is bigger, the amount of information that comprises in the feedback signal is less like this, causes the waste of resource.
In addition, also there is a kind of technical scheme, scheduler is according to the relevant information of actual channel condition, maximum retransmission when real-time adjustment data send, scheduler selects the modulating-coding form that information bit is encoded according to the relevant information of channel condition, forms the channel code block number that equates with maximum retransmission, and transmit leg once sends and finishes, the recipient only receives once continuously, merges ACK of back feedback or NACK.
But in this technical scheme, because the adjustment of maximum retransmission is to carry out according to the variation of channel condition, the influence that is subjected to time delay has certain error, so descend for the accuracy of the tracking of channel condition, causes the error rate to improve or the waste of resource; In addition, because coded once whole end of transmission can not well utilize time diversity, so can influence the performance of HARQ.
Summary of the invention
Have in view of that, the invention provides a kind of data transmission method and system,, and then improve utilization rate of channel resources so that can effectively reduce the feedback signaling expense in the data transmission procedure.
The invention provides a kind of data transmission method, this method mainly comprises
Steps A, transmit leg is encoded with the code block number that obtains equating with maximum retransmission to information bit, and transmit leg is divided at least 2 groups with these code blocks, and at least the 1 group comprises at least 2 code blocks; And, the Transmission Time Interval between each code block in the group is set, and sends to the recipient to there being the group of at least 2 code blocks;
Step B, recipient receive code block and decoding, after whenever receiving a group code piece, if NACK of the incorrect always just unified feedback of decoding.
The present invention also provides a kind of data transmission system, comprises user terminal or base station as transmit leg, and corresponding base station or user terminal as the recipient, and transmit leg comprises continuous coding module and sending module; The recipient comprises continuous reception decoder module and ACK/NACK sending module, wherein, being provided with the grouping module and the time that link to each other successively between coding module and sending module is provided with module, coding module is encoded with the code block number that obtains equating with maximum retransmission to information bit, grouping module is divided at least 2 groups with these code blocks, and at least the 1 group comprises at least 2 code blocks; And to there being the group of at least 2 code blocks, the time is provided with module the Transmission Time Interval between each code block in the group is set, and sends to the recipient by sending module; Recipient's reception decoder module reception code block and decoding after whenever receiving a group code piece, are just fed back a NACK by described ACK/NACK sending module to described transmit leg unification if decoding is incorrect always.
Compared with prior art, utilize method of the present invention or system when the transmission data, because transmit leg is to existing the group of at least 2 code blocks, Transmission Time Interval between each code block in the group is set, so it is less to be subjected to the influence of time delay during transfer of data, accuracy for the tracking of channel condition is higher, can reduce the error rate effectively and reduce the waste of resource; And after the recipient was whenever received a group code piece, if decoding is also incorrect always, reception was fed back a NACK to the scheduler unification just now, so can effectively reduce the feedback signaling expense in the data transmission procedure, improved utilization rate of channel resources.
Description of drawings
Fig. 1 is the transfer of data flow process figure of prior art.
Fig. 2 is the data transmission system block diagram of the present invention's one better embodiment
Fig. 3 is the data transmission step block diagram of the present invention's one better embodiment.
Fig. 4 is the transfer of data flow process figure of the unique user terminal of first embodiment of the invention.
Fig. 5 is the transfer of data flow process figure of 6 user terminals of second embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is further detailed explanation.
Core content of the present invention is: data are carried out inhomogeneous transmission, promptly the data that the have a plurality of code blocks code block that the time is more forward is concentrated and transmitted continuously or the transmission that sets interval.
As shown in Figure 2, be the present invention's one preferable data transmission system, mainly comprise transmit leg 21 and recipient 22, this transmit leg 21 can be user terminal, and then recipient 22 is the base station; This transmit leg 21 also can be the base station, and then recipient 22 is a user terminal.Transmit leg 21 comprises mainly that successively the coding module 211, grouping module 212, the time that link to each other is provided with module 213 and sending module 214, also comprises ACK/NACK receiver module 215 in addition; Recipient 22 comprises continuous reception decoder module 221 and ACK/NACK sending module 222, and also is provided with a scheduler (figure does not show) in the base station.
During transfer of data, scheduler in the base station is at first in large numbers of user terminals, selecting user terminal according to corresponding criterion such as fairness PF principle, maximum throughput max througnput principle, cycle assignment round robin principle etc., is to show these user terminals to send out data when descending; Be to allow these user terminals send out data when up; Determine the running time-frequency resource and the modulating-coding form of each user terminal afterwards, size and modulating-coding form according to running time-frequency resource, the length that can draw information bit is the size of data block, and scheduler all sends 22 to transmit leg 21 with the recipient with above-mentioned scheduling result.
The modulating-coding form that the coding module 211 of this transmit leg 21 is determined according to scheduler is encoded to information bit, forms the code block number that equates with maximum retransmission, and wherein every channel code quantity that is comprised equates; Grouping module 212 is divided at least 2 groups with these code blocks again, and at least the 1 group comprises at least 2 code blocks, this packet mode can be that transmit leg 21 is made an appointment with recipient 22, also can be changeless, or by scheduler short notice transmit leg 21 and recipient 22, or by transmit leg 21 short notice recipients 22; Time is provided with module 213 again to there being the group of at least 2 code blocks, and the Transmission Time Interval between each code block in the group is set, and sends to recipient 22 by sending module 214; Recipient 22 reception decoder module 221 receives code block and decoding according to the packet mode and the time interval of running time-frequency resource and setting in time that is provided with and channel appointed.
Receive decoder module 221 can one group of every reception or code block of every reception just decode, to obtain corresponding data block, and the data block that will concern if having time merges, if decoding is correct after receiving certain block code piece, just at once by ACK/NACK sending module 222 to ACK/NACK receiver module 215 feeding back ACKs, this end of transmission, remaining do not have the code block of transmission to abandon; Incorrect if decode, then receive decoder module 221 and receive the code block of this group always, if the also incorrect ability of decoding is unified to NACK of the ACK/NACK of transmit leg 21 receiver module 215 feedbacks by ACK/NACK sending module 222, carry out transmission next time again, just finish up to reaching maximum retransmission, remaining do not have the sign indicating number of transmission to abandon this end of transmission soon.If transmit leg 21 is a user terminal, recipient 22 is the base station, and then the ACK/NACK receiver module 215 of user terminal also needs ACK/NACK information is sent to the scheduler of base station; If transmit leg 21 is the base station, recipient 22 is a user terminal, and then the ACK/NACK receiver module 215 of base station directly transmits its scheduler with ACK/NACK information.
In receiving course, receiving decoder module 221 needs data block that decoding is obtained and the data block that decoding before this obtains to merge, and judges whether the decoding after merging is correct, again by above-mentioned method feeding back ACK or NACK again.
Above-mentioned only is the course of work of data transmission system of the present invention, and its concrete data transmission procedure as shown in Figure 3, is the data transmission procedure block diagram of the present invention's one better embodiment as described in the following better embodiment, and its key step comprises:
Transmit leg periodically sends pilot tone to the recipient, but in general, the transmission course of data is lasting processes, so transmit leg generally can send pilot tone and data simultaneously, the transmission of these data is that the channel condition that pilot tone comprised according to the last time sends.Transmit leg can be a user terminal, and then the recipient is the base station; Transmit leg also can be the base station, and then the recipient is a user terminal.
Periodically send pilot tone corresponding to transmit leg to the recipient, the recipient also be according to the pilot period that receives ground by sending direction scheduler feedback channel conditional information, this channel condition information can comprise channel resource whether sufficient information, channel power information etc.
Transmit leg is encoded to information bit according to the modulating-coding form that should determine, forms the code block number that equates with maximum retransmission, and wherein every channel code quantity that is comprised equates.Again these code blocks are divided at least 2 groups, and at least the 1 group comprises at least 2 code blocks, and packet mode can be that transmit leg and recipient make an appointment, and also can be changeless, or by scheduler short notice transmit leg and recipient, or by transmit leg short notice recipient; Transmit leg is provided with the Transmission Time Interval between each code block in the group to there being the group of at least 2 code blocks, and time interval in same group or on the same group time interval is not set at arbitrarily integer value more than or equal to 0 by transmit leg.
The sending direction recipient sends code block simultaneously and comprises the pilot tone of current channel condition information.
The recipient can one group of every reception or code block of every reception just decode, obtaining corresponding data block, and the data block that will concern if having time merges, if receive behind certain block code piece the correct just feeding back ACK at once of decoding, this end of transmission, remaining do not have the code block of transmission to abandon; Incorrect if decode, then the recipient is received the code block of this group always, if NACK of the also incorrect just unified feedback of decoding.In receiving course, the recipient needs data block that decoding is obtained and the data block that decoding before this obtains to merge, and judges whether the decoding after merging is correct, again by above-mentioned method feeding back ACK or NACK again.
After this step 306 if that feedback is NACK, then enters an above-mentioned similar cyclic process, and scheduler is determined transmitting time, channel resource and the modulating-coding form of next group code piece once more according to the channel condition of receiving, and to transmit leg feedback scheduling result; Transmit leg carries out next time transmission again according to scheduling result, just finishes up to reaching maximum retransmission, remaining not have a transmission yard abandon this end of transmission soon.
As data transmission procedure, can be the data transmission procedure of preferable first execution mode of the present invention as shown in Figure 4 to single subscriber terminal.Transmit leg is according to the scheduling result of scheduler, determine to send time, shared system resource and the modulating-coding form of this user terminal data, and setting maximum retransmission is 4 times, transmit leg is encoded to information bit 41 according to the modulating-coding form that should determine, form the code block 42,43,44,45 that equates with maximum retransmission, wherein every channel code quantity that is comprised equates.
Consider first or the accuracy of preceding transmission several times lower, so transmit leg can be provided with the time relationship between some code block, form a group as the code block that will share ACK or NACK feedback, then in Fig. 4, code block 42,43,44,45 is divided into 3 groups altogether and carries out combination of transmitted, then establish the 1st group and comprise 2 code blocks 42,43, the 2nd group comprises 1 code block and comprises 1 code block 45 for 44, the 3 groups.
The 1st group comprises code block 42,43, carries whole primary data information (pdi)s, and what carry whole raw information can be the first block code piece 42 in this group, also can be that all code blocks of this group carry whole primary data information (pdi)s jointly; Whole primary data information (pdi)s can be carried or do not carried to all follow-up groups, also can the selection portion grouping carry whole primary data information (pdi)s from all subsequent group, but the group of entrained primary data information (pdi) must be carried whole primary data information (pdi)s.
And the interblock time gap that the 1st group code block 42,43 is set is t
1, t
1Can get integer value, t in the present embodiment more than or equal to 0
1Equal 0.
During transmission, transmit leg at first sends the 1st group code block 42,43 and pilot tone to the recipient since interblock time interval of code block 42,43 be 0, so transmit leg is continuously code block 42,43 to be sent to the recipient.
The recipient receives this code block 42,43 and decoding obtains data block 421,431 respectively, the recipient merges data block 421,431, feed back a NACK400 according to amalgamation result to transmit leg, reach according to pilot tone and feed back current channel condition to transmit leg, transmit leg is transmitted to scheduler with this NACK400 and current channel condition.
After this enter an above-mentioned similar cyclic process, scheduler is determined transmitting time, channel resource and the modulating-coding form of the 2nd group code piece 44 once more according to the channel condition of receiving, and to transmit leg feedback scheduling result.
Transmit leg sends code block 44 and pilot tone once more according to scheduling result, the recipient receives this code block 44 and decoding obtains data block 441, the recipient with data block 441 with its before the data block 421,431 of decoding merge, feed back a NACK401 according to amalgamation result to transmit leg, reach according to pilot tone and feed back current channel condition to transmit leg, transmit leg is transmitted to scheduler with this NACK401 and current channel condition.
Scheduler is determined transmitting time, channel resource and the modulating-coding form of the 3rd group code piece 45 once more according to the channel condition that receives, and to transmit leg feedback scheduling result.
Transmit leg sends code block 45 and pilot tone according to scheduling result once more, the recipient receives this code block 45 and decoding obtains data block 451, the recipient with data block 451 with its before the data block 421,431,441 of decoding merge, feed back an ACK402 according to amalgamation result to transmit leg, reach according to pilot tone to the current channel condition of transmit leg feedback, be correctly decoded this moment, and fed back ACK402, then this DTD.
Transmit leg still will periodically be transmitted from the channel condition information of recipient's feedback and to the recipient to scheduler and send pilot tone, in order to transfer of data after this but after this.
In the data transmission procedure of first execution mode, the sending direction recipient sends pilot tone, and the process of recipient according to the pilot tone that receives and by sending direction scheduler feedback channel conditional information is time-continuing process periodically, therefore, scheduler can be adjusted dynamically according to the different channels conditional information, be that transmit leg is determined to send time, shared system resource and the modulating-coding form of next group code piece of user terminal to send next group code piece according to the scheduling result of scheduler once more, up to recipient's feeding back ACK or reach maximum retransmission, this end of transmission.
Above-mentioned for single subscriber terminal be data transmission procedure among 4 times the HARQ in maximum retransmission, because the code block 42 of a NACK feedback will be shared by system when transmission, 43 form a group, and code block 42 is set, time relationship between 43, and the recipient receives this group code piece 42, decode after 43, only after this group of received and decoding are finished, just to NACK of the unified feedback of scheduler, so can effectively reduce the feedback signaling expense in the data transmission procedure, improve utilization rate of channel resources, in addition, when receiving, the recipient is the time interval according to running time-frequency resource and setting, in the time that is provided with, receive code block and decoding,, improve utilization rate of channel resources so also can effectively reduce the feedback signaling expense in the data transmission procedure.
Above-mentioned for the maximum retransmission of single subscriber terminal is 4 data transfer processes, when maximum retransmission is n, and the integer of n 〉=2, the detailed process of transfer of data can be as described below.
Transmit leg periodically sends pilot tone and transmits the channel condition that the recipient feeds back to scheduler to the recipient, scheduler is according to the channel condition information that receives, and according to fairness PF principle, maximum throughput max througnput principle, cycle assignment round robin principle etc., determine to send time, shared system resource and the modulating-coding form of this user terminal data, and the data of dispatching this user terminal, scheduler is issued transmit leg and recipient with scheduling result.Transmit leg is encoded to information bit according to the modulating-coding form of determining in the scheduling result, and forming with maximum retransmission is that the code block that equates for n time is counted n, and wherein every channel code quantity that is comprised is equal.
Consider first or the accuracy of preceding transmission several times lower, so transmit leg can be provided with the time relationship between some code block, form a group as the code block that will share ACK or NACK feedback, then establish and these code blocks can be divided into m group and carry out combination of transmitted, and m＜n, and packet mode can be that transmit leg and recipient make an appointment, and also can be changeless, or by scheduler short notice transmit leg and recipient, or by transmit leg short notice recipient.
The 1st group code piece carries whole primary data information (pdi)s, can be that the first block code piece in this group carries whole raw information, also can be that all code blocks of this group carry whole primary data information (pdi)s jointly; Whole primary data information (pdi)s can be carried or do not carried to all follow-up groups, also can the selection portion grouping carry whole primary data information (pdi)s from follow-up all groups, but the group of entrained primary data information (pdi) must be carried whole primary data information (pdi)s.
If the 1st group of code block number that comprises is n
1, the 2nd group of code block number that comprises is n
2..., the code block number that the m group comprises is n
mWherein, n
1〉=n
2〉=... 〉=n
m〉=1 and n
1＞1, n
1+ n
2+ ... + n
m=n;
If the interblock time interval of the code block of each group is respectively t
1, t
2..., t
m, unit is TTI, t
1, t
2..., t
mCan equate also can be unequal, simultaneously, if necessary, the time interval between each code block in the group also can equate or not wait, the time interval in present embodiment the best is set to organize equates, if the code block number in a certain group is less than 2, thinks that then this t is meaningless, for significant t, can get integer value more than or equal to 0.
When transfer of data, transmit leg according to group time successively transmission, to containing the group of at least 2 code blocks, is provided with the interblock time interval of each code block in the group with all code blocks, if in the group time interval of code block be 0, code block that then should group be to transmit continuously; If the time interval of code block is the integer value more than or equal to 0, then transmit leg just sends code block according to the time interval of this setting.
The recipient is according to the packet mode and the time interval of running time-frequency resource and setting, in time that is provided with and channel appointed, receive code block and decoding, the recipient can one group of every reception or code block of every reception just decode, to obtain corresponding data block, and the data block that will concern if having time merges, if receive behind certain block code piece the correct just feeding back ACK at once of decoding, this end of transmission, the remaining code block that not have to transmit abandons; Incorrect if decode, then the recipient is received the code block of this group always, if NACK of the also incorrect just unified feedback of decoding, carry out transmission next time again, just finish up to reaching maximum retransmission, remaining do not have the sign indicating number of transmission to abandon this end of transmission soon.In receiving course, the recipient needs data block that decoding is obtained and the data block that decoding before this obtains to merge, and judges whether the decoding after merging is correct, again by above-mentioned method feeding back ACK or NACK again.
If the recipient is not correctly decoded, then to scheduler feedback NACK, scheduler determines to send time, shared system resource and the modulating-coding form of next group code piece of this user terminal once more, and dispatch this group code piece, scheduler is issued transmit leg and recipient with scheduling result, and transmit leg sends next group code piece according to scheduling result, up to reaching maximum retransmission n time, this transmission just finishes, and remaining do not have the code block of transmission to abandon.
Above-mentioned is the data output procedure of single subscriber terminal, but concerning communication system, generally has a plurality of user terminals, so can be the second preferable execution mode transfer of data flow process figure of the present invention as shown in Figure 5 to the data transmission procedure of multiple users.
As shown in Figure 5, be provided with 6 user terminals 51,52,53,54,55,56 in the present embodiment and carry out transfer of data, user terminal 51 comprises code block 51A, 51B, 51C, 51D, user terminal 52 comprises code block 52A, 52B, 52C, 52D, user terminal 53 comprises code block 53A, 53B, 53C, 53D, user terminal 54 comprises code block 54A, 54B, 54C, 54D, and user terminal 55 comprises code block 55A, 55B, 55C, 55D, and user terminal 56 comprises code block 56A, 56B, 56C, 56D.
During transmission, transmit leg periodically sends pilot tone and transmits the channel condition that the recipient feeds back to scheduler to the recipient, the transmission of the code block of a plurality of user terminals still can be respectively carried out according to the data transmission procedure of above-mentioned single subscriber terminal, scheduler is according to the channel condition information that receives, and according to fairness PF principle, maximum throughput max througnput principle, cycle assignment round robin principle etc., determine to send the time of certain user terminal data, shared system resource and modulating-coding form, and dispatch this user terminal and corresponding data thereof, scheduler sends to transmit leg and recipient with this scheduling result, transmit leg is encoded according to scheduling result, to form the code block number that equates with this number of maximum retransmit, and these code blocks are divided into groups according to the mode of transmission unique user terminal, send code block again.
As data transmission procedure to user terminal 51, scheduler is determined time, shared system resource and the modulating-coding form of the data of transmission user terminal 51, and setting maximum retransmission is 4 times, transmit leg is encoded to information bit according to the modulating-coding form that should determine, form code block 51A, the 51B, 51C, the 51D that equate with maximum retransmission, wherein every channel code quantity that is comprised equates.
Transmit leg divides into groups code block 51A, 51B, 51C, 51D, and being divided into is 3 groups, and the 1st group comprises code block 51A, 51B, and the 2nd group comprises code block 51C, and the 3rd group comprises code block 51D.
Transmit leg transmits the 1st group code block 51A, 51B or the transmission that sets interval continuously, and send pilot tone to the recipient, the recipient receives code block 51A, 51B and decoding obtains corresponding data block 501A, 501B, data block 501A, 501B that transmit leg will concern if having time again merge,, reach according to pilot tone to person NACK510 of scheduler feedback according to the amalgamation result unification to the scheduler feedback channel condition of this moment.
Scheduler determines to send time, shared system resource and the modulating-coding form of next group code piece 51C of this user terminal once more, and scheduling result sent to transmit leg, transmit leg sends code block 51C and pilot tone according to scheduling result, the recipient receives to decode behind the code block 51C and obtains data block 501C, the recipient merges data block 501C and data block 501A, the 501B that decoding before this obtains, be correctly decoded, to scheduler feeding back ACK 511, this DTD then, remaining not the 3rd group code piece 51D of transmission abandons.Transmit leg still will periodically be transmitted the channel condition of recipient's feedback and send pilot tone to the recipient to scheduler, in order to transfer of data after this but after this.
In the data procedures of above-mentioned transmission user terminal 51, be a periodic time-continuing process according to the pilot tone that receives to the process of scheduler feedback channel condition because the sending direction recipient sends the process and the recipient of pilot tone.So in the data transmission procedure of user terminal 51, after code block 51A, the 51B transmission of transmit leg with user terminal 51, scheduler can be according to different channel condition information, the data of dispatching other user terminal are transmitted.
For example, the recipient can be at once to scheduler feedback NACK510, but scheduler is according to variation and some other principle of the channel condition of receiving, dispatched users terminal 54 and corresponding data thereof, scheduler is issued transmit leg and recipient with scheduling result, and transmit leg carries out coding and the grouping similar with user terminal 51 according to scheduling result to the data of user terminal 54, and the 1st group comprises code block 54A, 54B, the 2nd group comprises code block 54C, and the 3rd group comprises code block 54D.
Transmit leg transmits the 1st group code block 54A, 54B or the transmission that sets interval continuously, and the recipient receives code block 54A, 54B and is decoded as data block 504A, 504B.
After transmit leg sends the 1st group code block 54A, 54B of user terminal 54, scheduler is again according to the variation of the channel condition of receiving and the data of some other principle dispatched users terminal 52 and correspondence thereof, scheduler is issued transmit leg and recipient with scheduling result, transmit leg carries out coding and the grouping similar with user terminal 51 according to scheduling result to the data of user terminal 52, the 1st group comprises code block 52A, 52B, the 2nd group comprises code block 52C, and the 3rd group comprises code block 52D.
Transmit leg transmits the 1st group code block 52A, 52B or the transmission that sets interval continuously.The recipient receives code block 52A, 52B and is decoded as data block 502A, 502B, simultaneously the NACK510 of the code block transmission of receive direction scheduler feedback related user terminal 51.
After scheduler received NACK510, scheduler was determined time, shared system resource and the modulating-coding form of the 3rd group code block 51C of transmission user terminal 51 once more, and scheduling result is issued transmit leg, and transmit leg sends code block 51C according to scheduling result.
In data transmission procedure after this, similar with the process of above-mentioned transfer of data, be variation and the some other principle of scheduler according to the channel condition of receiving, determine to send user terminal 51,52,53,54,55, the time of certain user terminal data in 56, shared system resource and modulating-coding form, and then be dispatched to this user terminal and corresponding data thereof, scheduler is issued transmit leg and recipient with scheduling result, transmit leg is encoded to the data of the user terminal of scheduling according to scheduling result and code block is divided into groups, transmit leg is concentrated the code block of each group of this user terminal continuously or the transmission that sets interval, and periodically sends pilot tone to the recipient.
But for same user terminal, identical with the process of the data of transmitting the unique user terminal, the transmission course that is data is: time, shared system resource and modulating-coding form that scheduler determines to send certain user terminal data according to relevant information and some other principle of channel condition, transmit leg is encoded to information bit according to the modulating-coding form that should determine, form the code block number that equates with maximum retransmission, wherein every channel code quantity that is comprised equates.Transmit leg is divided at least 2 groups with these code blocks, and at least the 1 group comprises at least 2 code blocks, and packet mode can be that transmit leg and recipient make an appointment, and also can be provided with constant, or by scheduler short notice transmit leg and recipient, or by transmit leg short notice recipient; Transmit leg is provided with the Transmission Time Interval between each code block in the group, and sends to the recipient there being the group of at least 2 code blocks; The recipient receives code block and decoding according to the packet mode and the time interval of running time-frequency resource and setting in time that is provided with and channel appointed, after whenever receiving a group code piece, if NACK of the incorrect always just unified feedback of decoding.
The recipient can one group of every reception or code block of every reception just decode, obtaining corresponding data block, and the data block that will concern if having time merges, if receive behind certain block code piece the correct just feeding back ACK at once of decoding, this end of transmission, remaining do not have the code block of transmission to abandon; Incorrect if decode, then the recipient is received the code block of this group always, if NACK of the also incorrect just unified feedback of decoding, carry out transmission next time again, just finish up to reaching maximum retransmission, remaining do not have the sign indicating number of transmission to abandon this end of transmission soon.In receiving course, the recipient needs data block that decoding is obtained and the data block that decoding before this obtains to merge, and judges whether the decoding after merging is correct, again by above-mentioned method feeding back ACK or NACK again.
As shown in Figure 5, NACK510,540,520,550,530 is respectively user terminal 51,54,52,53 at the NACK that the recipient receives code block and feed back to scheduler the back of decoding, and ACK511,541,521 is respectively user terminal 51,54,52 ACK to the scheduler feedback after the recipient receives code block and decoding.If scheduler is received ACK, this DTD then, remaining do not have the code block of transmission to abandon, code block 51D as the 3rd group of user terminal 51 among the figure, the code block 52D that user terminal 52 is the 3rd group, the code block 53D of the code block 53C that user terminal 52 is the 2nd group and the 3rd group, the code block 55D that user terminal 55 is the 3rd group, the code block 56D of the code block 56C that user terminal 56 is the 2nd group and the 3rd group is the code block that does not have transmission to abandon.
As seen, when having multiple users, the data of a plurality of user terminals still can be respectively carried out according to the data transmission procedure of the single subscriber terminal of first embodiment of the invention.
In sum, in the data transmission procedure of the present invention,, transmit leg transmits continuously or the transmission that sets interval because concentrating the code block of the group that comprises 2 code blocks at least.After the recipient receives code block, incorrect if decode, just continue to receive other code block of organizing under this code block, if after receiving this group code piece, it is also incorrect to decode, receive just now to NACK of scheduler feedback, so can effectively reduce the feedback signaling expense in the data transmission procedure, improve utilization rate of channel resources, in addition, the recipient can also receive code block and decoding according to the packet mode and the time interval of running time-frequency resource and setting in time that is provided with and channel appointed, so also can effectively reduce the feedback signaling expense in the data transmission procedure, improve utilization rate of channel resources.
Above-mentioned only is better embodiment of the present invention; be not to be used to limit protection scope of the present invention; any those skilled in the art of being familiar with will be appreciated that; all within the spirit and principles in the present invention scope; any modification of being done, equivalence replacement, improvement etc. all should be included within the scope of the present invention.
Claims (28)
1. data transmission method is characterized in that step mainly comprises:
Steps A, transmit leg is encoded with the code block number that obtains equating with maximum retransmission to information bit, and transmit leg is divided at least 2 groups with these code blocks, and at least the 1 group comprises at least 2 code blocks; And, the Transmission Time Interval between each code block in the group is set, and sends to the recipient to there being the group of at least 2 code blocks;
Step B, recipient receive code block and decoding, after whenever receiving a group code piece, if NACK of the incorrect always just unified feedback of decoding.
2. a kind of data transmission method as claimed in claim 1 is characterized in that: among the step B, the recipient receives whenever that a group code piece is decoded or code block of the every reception of recipient is decoded.
3. a kind of data transmission method as claimed in claim 2 is characterized in that: step B comprises that also the recipient whenever receives a group code piece and decode, then after this group decoding, according to the correctness ACK of unified feedback or the NACK of decoding.
4. a kind of data transmission method as claimed in claim 2 is characterized in that: step B comprises that also code block of the every reception of recipient decodes, then as long as decoding is correct, with regard to feeding back ACK.
5. a kind of data transmission method as claimed in claim 1 is characterized in that: step B also comprise the recipient decode obtain corresponding data block after, with if having time the relation data block merge.
6. a kind of data transmission method as claimed in claim 1 is characterized in that: branch group number in groups is less than maximum retransmission.
7. a kind of data transmission method as claimed in claim 1 is characterized in that: the 1st group of code block number that comprises to pass of the code block number that last group is comprised is: last group of code block number that comprises is more than or equal to one group of code block number that is comprised thereafter.
8. a kind of data transmission method as claimed in claim 1 is characterized in that: the 1st group is carried whole primary data information (pdi)s.
9. a kind of data transmission method as claimed in claim 8 is characterized in that: whole primary data information (pdi)s is carried by the 1st group the 1 block code piece at least.
10. a kind of data transmission method as claimed in claim 8 is characterized in that: the 1st group of all follow-up group or selection portion grouping from its all follow-up groups, each group is carried whole primary data information (pdi)s.
11. a kind of data transmission method as claimed in claim 10 is characterized in that: whole primary data information (pdi)s is carried by every group 1 block code piece at least.
12. as each described a kind of data transmission method of claim 1-11, it is characterized in that: the time interval is the integer value more than or equal to 0.
13. a kind of data transmission method as claimed in claim 12 is characterized in that: time interval in same group the or time interval on the same group is set at arbitrarily integer value more than or equal to 0 by transmit leg.
14. a kind of data transmission method as claimed in claim 1 is characterized in that: user terminal is a transmit leg, and the base station is the recipient; Or the base station is transmit leg, and user terminal is the recipient.
15. a data transmission system comprises user terminal or base station as transmit leg, and corresponding base station or user terminal as the recipient, it is characterized in that: transmit leg comprises continuous coding module and sending module; The recipient comprises continuous reception decoder module and ACK/NACK sending module, being provided with the grouping module and the time that link to each other successively between coding module and sending module is provided with module, coding module is encoded with the code block number that obtains equating with maximum retransmission to information bit, grouping module is divided at least 2 groups with these code blocks, and at least the 1 group comprises at least 2 code blocks; And to there being the group of at least 2 code blocks, the time is provided with module the Transmission Time Interval between each code block in the group is set, and sends to the recipient by sending module; Recipient's reception decoder module reception code block and decoding after whenever receiving a group code piece, are just fed back a NACK by described ACK/NACK sending module to described transmit leg unification if decoding is incorrect always.
16. a kind of data transmission system as claimed in claim 15 is characterized in that: receive decoder module and receive whenever that a group code piece is decoded or code block of the every reception of recipient is decoded.
17. a kind of data transmission system as claimed in claim 16, it is characterized in that: described reception decoder module is whenever received a group code piece and is decoded, then after this group decoding, according to the correctness of decoding by the unification of ACK/NACK sending module to ACK of transmit leg feedback or NACK.
18. a kind of data transmission system as claimed in claim 16 is characterized in that: code block of the every reception of described reception decoder module is decoded, then as long as decoding is correct, just by the ACK/NACK sending module to the transmit leg feeding back ACK.
19. a kind of data transmission system as claimed in claim 15, it is characterized in that: also comprise the scheduler that is positioned at the base station, this scheduler is according to the definite modulating-coding form that sends certain user terminal data of channel condition information, and then coding module is encoded to user terminal data according to the modulating-coding form that should determine.
20. a kind of data transmission system as claimed in claim 15 is characterized in that: after reception decoder module reception code block is decoded and obtained corresponding data block, also will have the data block of the time relationship of being provided with to merge.
21. a kind of data transmission system as claimed in claim 15 is characterized in that: grouping module makes branch group number in groups less than maximum retransmission.
22. a kind of data transmission system as claimed in claim 15 is characterized in that: grouping module is made as the 1st group of code block number that comprises to relation of last code block number of being comprised of group: last group of code block number that comprises is more than or equal to one group of code block number that is comprised thereafter.
23. a kind of data transmission system as claimed in claim 15 is characterized in that: the sending module setting is carried whole primary data information (pdi)s by the 1st group.
24. a kind of data transmission system as claimed in claim 23 is characterized in that: whole primary data information (pdi)s is carried by the 1st group the 1 block code piece at least.
25. a kind of data transmission system as claimed in claim 23 is characterized in that: the sending module setting is by the 1st group of all follow-up groups or selection portion grouping from its all follow-up groups, and each group is carried whole primary data information (pdi)s.
26. a kind of data transmission system as claimed in claim 25 is characterized in that: whole primary data information (pdi)s is carried by every group 1 block code piece at least.
27. as each described a kind of data transmission system of claim 15-26, it is characterized in that: the time is provided with module and will be made as integer value more than or equal to 0 time interval.
28. a kind of data transmission system as claimed in claim 27 is characterized in that: time interval in same group the or time interval on the same group is provided with module settings for arbitrarily more than or equal to 0 integer value by the time.
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