CN1213557C - Link self adaptation method based on self adaptation coded modulation and automatic retransmission request - Google Patents
Link self adaptation method based on self adaptation coded modulation and automatic retransmission request Download PDFInfo
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- CN1213557C CN1213557C CNB011422718A CN01142271A CN1213557C CN 1213557 C CN1213557 C CN 1213557C CN B011422718 A CNB011422718 A CN B011422718A CN 01142271 A CN01142271 A CN 01142271A CN 1213557 C CN1213557 C CN 1213557C
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Abstract
The present invention discloses a link self adaptation method based on self adaptation code modulation and automatic retransmission requests. A suitable communication channel code modulation scheme and the number of the maximum retransmission times under the communication channel condition are selected by making sure the transmission conditions of the down communication channel; then, data packets are transmitted; whether the data packets need retransmitting or not is judged according to the information after the confirmation information of the data packets is received. When the data packets need retransmitting, whether the number of the retransmitting times of the data packets exceeds the maximum value allowed by the system or exceeds the maximum value allowed under the current communication channel condition is judged. When the number of the times exceeds the maximum value, the operation is ended; else, the suitable communication channel code modulation scheme is selected again, and the operation of transmitting the data packets is continued after the maximum retransmitting times under the communication channel condition. The integral performance of the selection of MCS and the selection of the maximum retransmitting times are optimized by adopting the scheme, so the link self adaptation ability of the system can be enhanced, and further, the quality of the transmission of the data packets and the transmission performance of the system are enhanced.
Description
Technical field:
The present invention relates to the down link self adaption technology in the WCDMA system, especially based on the chain circuit self-adaptive method of adaptive coding and modulating with automatic repeat requests.
Background technology:
In WCDMA high-speed data packet insertion system, AMC (adaptive coding and modulating) and HARQ (mixing automatic repeat requests) are two kinds of crucial chain circuit self-adaptive methods, are used to solve because the data packet transmission Problem-Error that channel conditions deteriorate causes.If adopt the AMC method, when changes in channel conditions, system can select the condition of optimal coded modulation scheme adaptive channel to change according to channel situation at that time, for example increases redundant information, to eliminate the error of transmission of packet as far as possible; If adopt the HARQ method, by user side the data that each TTI (Transmission Time Interval) receives are carried out verification, judge whether the data of reception are correct.If the data that receive are correct, then return confirmation (ACK) to the base station; If incorrect, then return not confirmation (NACK) information, the base station is after receiving nack message, the packet of corresponding transmission failure is resend, after testing again by user side, feed back to ACK or nack message, correctly receive this packet up to user side.By above-mentioned HARQ method, can guarantee to be able to solve, and then guarantee the correct of reception data by retransmitting owing to channel conditions changes the packet error code that causes.The adaptive approach of two kinds of above-mentioned down links independent action in the transmission of system data bag, do not mutually combine, when carrying out MCS (coded modulation scheme) selection, do not consider of the influence of the maximum retransmission of different HARQ methods to link performance, that is to say, the selection of the selection of MCS and HARQ maximum retransmission is not combined consideration, make the overall performance of AMC and HARQ not reach optimum, therefore, can pass through to select the maximum retransmission of more effective MCS and HARQ, thereby improve the link circuit self-adapting performance of AMC and HARQ.
Summary of the invention:
The objective of the invention is to, a kind of chain circuit self-adaptive method based on adaptive coding and modulating and automatic repeat requests is provided, use this method can improve the link circuit self-adapting performance of AMC and HARQ, and then improve the transmission quality and the system transmissions performance of packet.
For achieving the above object, the chain circuit self-adaptive method based on adaptive coding and modulating and automatic repeat requests provided by the invention comprises:
Step 3 receives the affirmation information of described packet, judges according to described information whether needs resend described packet, if do not need, and end operation, otherwise,
Because the present invention is in WCDMA high-speed data packet insertion system, adopt MCS and the dual adaptive method of HARQ maximum retransmission to carry out the transmission of packet, make the overall performance of the selection of the selection of MCS and maximum retransmission reach optimum, therefore the link circuit self-adapting ability of system be can improve, and then the transmission quality and the system transmissions performance of packet improved.
Description of drawings:
Fig. 1 is the data throughout schematic diagram of different coding modulation scheme and the combination of packet maximum transmission times;
Fig. 2 is the data throughout coenvelope schematic diagram of different coding modulation scheme and the combination of packet maximum transmission times;
Fig. 3 is the embodiment flow chart of the method for the invention.
Embodiment:
The present invention is described in further detail below in conjunction with accompanying drawing.
AMC and HARQ are the basic link adaptation techniques of high-speed data packet insertion system, therefore, how to improve this two kinds of methods, improve the overall performance of AMC and HARQ, it is the important means that improves HSDPA (high speed packet access) throughput, select MCS and HARQ maximum retransmission exactly, can improve the link circuit self-adapting performance of AMC and HARQ.
In high-speed data access system, under the certain situation of re-transmission mode, the selection of MCS and maximum retransmission N has just become the decisive factor of physical layer link performance.Therefore, the dual adaptive method of MCS and maximum retransmission is not only MCS and is adjusted along with the variation of channel conditions, and maximum retransmission reaches the optimum of MCS, N also along with the channel conditions self adaptation is adjusted.
Be that example describes with two kinds of MCS ranks and two kinds of maximum retransmission below.
Fig. 1 is the data throughout schematic diagram of different coding modulation scheme and the combination of packet maximum transmission times.Among Fig. 1, abscissa is a signal interference ratio, and ordinate is a throughput of system.Have among Fig. 1 (MCS1, N1), (MCS1, N2), (MCS2, N1), (Zu He performance curve corresponds respectively to curve 1,2,3,4 separately for MCS2, N2) 4 kinds of different coded modulation schemes and packet maximum transmission times compound mode.If selected certain maximum retransmission is carried out the adaptively selected of MCS, can obtain maximum retransmission respectively and be the AMC performance curve 11,12 under N1, the N2, with reference to figure 2.Among Fig. 2, abscissa is a signal interference ratio, and ordinate is a throughput of system.If adopt the N value can not the self adaptation adjustment, by the self adaptation adjustment of MCS, the optimal performance of link can only select one in curve 11 or 12.Problem is, under the different channel conditions, the performance of two curves is always compared not one and is better than other one.Under the identical prerequisite of the precision of channel quality estimation, at interval I and III, curve 12 illustrates that under these two residing channel conditions in interval, maximum retransmission is that the AMC+HARQ performance of N2 is better than the performance that maximum retransmission is N1 on 11; Equally, at interval II and IV, maximum retransmission is that the AMC+HARQ performance of N1 is better than the performance that maximum retransmission is N1.Thus, can obtain the 3rd performance envelope curve: on curve 11,12 bases, choose maximum wherein, as the optimal performance baseline of system, with reference to the curve among the figure 2 13.Obviously, the performance of curve 13 necessarily is better than or equals 11,12, as seen, from this angle of link throughput, under the identical situation of other conditions, adopt the performance of MCS and the dual adaptive method of N, the performance that must be better than or equal not adopt this method to obtain.
Fig. 3 is the embodiment flow chart of the method for the invention.Implement the present invention according to Fig. 1, at first should create the mapping table of chnnel coding modulation scheme and maximum retransmission and channel condition, to select suitable chnnel coding modulation scheme and the maximum retransmission under this channel condition according to channel condition, the counter i and the j of the total re-transmission number of times be respectively applied for the record data bag and the number of retransmissions a kind of channel condition under is set then and is used to put down in writing the maximum retransmission reselected and the variable Nnew and the Nold of the maximum retransmission of selection last time, the scope Nmin that determines the HARQ maximum retransmission that system stipulates is to Nmax at last, and Nmax is the maximum of HARQ maximum retransmission.
In the described step 31 of Fig. 3, when new data packets need transmit, determine the transmission conditions of down channel, select suitable chnnel coding modulation scheme and the maximum retransmission Nnew under this channel condition according to described condition.The transmission conditions of described down channel can be determined according to the signal interference ratio or the signal to noise ratio of channel.In step 32, counter i, j are changed to 0; Make variable Nold equal Nnew in step 33; Before sending packet, make counter i add 1 in step 34, represent that the transmission number of times of this data block information has increased once; Send packet in step 35 then.The operation of certain described step 34 also can be carried out after step 35 is finished.Then wait for recipient's feedback data bag confirmation, and judge whether described packet needs to retransmit in step 36 data receiver; If do not need, then the transmission of this packet finishes; Retransmit if need, whether the number of retransmissions of then judging described packet surpasses the maximum of system's permission or surpasses the maximum that current channel condition allows down, do you promptly judge i＞Nmax? or j＞Nold? if wherein any one condition satisfies, then the transmission of this data block finishes, if two conditions all do not satisfy, then carry out step 38.For first Rule of judgment (i＞Nmax?), if number of retransmissions surpasses Nmax, concerning physical layer, should stop to retransmit, transfer to the upper strata and handle; For second Rule of judgment (j＞Nold?), because Nold is the maximum retransmission of the optimum selected current channel conditions under, that is to say, as long as channel conditions is constant in the channel retransmission processes, maximum retransmission just should be Nold, if j＞Nold, even total number of retransmissions surpass Nmax (i≤Nmax) retransmit and also should stop.In step 38, need redefine the transmission conditions of down channel, reselect suitable chnnel coding modulation scheme and the maximum retransmission Nnew under this channel condition according to described condition, for example reselect MCS and Nnew according to the mapping table of channel conditions and MCS, N, throughput.Judge in step 39 whether the maximum retransmission Nnew that reselects is identical with the maximum retransmission Nold that selected last time, then add 1 at step 40 counter j, under the constant condition of maximum retransmission, to continue the number of retransmissions of statistical data packet, otherwise j puts 0 at step 41 counter, with the number of retransmissions of statistical data packet again under the current channel condition, turn back to step 33 then and restart next time the resending and adding up of packet.
Need to prove that in some high-speed data access system, for the simplification that realizes, the rank of MCS does not change in the regulation retransmission processes.In this case, step 38 is reselected maximum retransmission Nnew under the constant condition of MCS; Step 39 judges whether Nnew equals Nold, if equate, then add 1 at step 40 counter j, otherwise put 0 at step 41 counter j, flow process turns back to step 34 then, and packet continues to retransmit.
The chnnel coding modulation scheme that the described method of Fig. 3 adopts and the mapping table of maximum retransmission and channel condition are with reference to following table:
| Channel conditions (CS) | ?CS1 | ?CS2 | ?CS3 | ?CS4 |
| (MCS under the different channels situation, N) Zu He priority (from top to bottom, priority reduces successively) | ?MCS1，N1 | ?MCS2，N2 | ?MCS3，N3 | ?MCS4，N4 |
| ?MCS2，N1 | ?MCS2，N3 | ?MCS2，N3 | ?MCS4，N2 | |
| ?MCS1，N2 | ?MCS1，N2 | ?MCS3，N1 | ?MCS3，N4 | |
| ?MCS2，N3 | ?MCS1，N1 | ?MCS4，N3 | ?MCS3，N3 | |
| ?MCS3，N3 | ?MCS4，N3 | ?MCS2，N4 | ?MCS2，N4 | |
| ?MCS4，N4 | ?MCS3，N3 | ?MCS1，N1 | ?MCS2，N3 |
The supposition channel conditions has 4 kinds of situations in the table, is respectively CS1～CS4; The MCS rank has 4 kinds, is MCS1～MCS4; Maximum retransmission has 4 kinds, is N1～N4, wherein Nmin=N1＜N2＜N3＜N4=Nmax.
Also need explanation, in the implementation process of the present invention, when chnnel coding modulation scheme of selecting according to channel condition to be fit to and the maximum retransmission under this channel condition, the chnnel coding modulation scheme of above-mentioned establishment and the mapping table of maximum retransmission and channel condition can be by creating the curve chart of chnnel coding modulation scheme and maximum retransmission and channel condition, and the function of perhaps creating chnnel coding modulation scheme and maximum retransmission and channel condition replaces.
Be the example that the MCS rank can change in the packet retransmission processes below:
As above shown in the table, unwrap when data and to start when sending, transmitting terminal is selected the combination of MCS and N according to channel conditions, and selection is carried out according to the priority supreme principle.If current channel conditions is CS2, transmitting terminal according to last table select (MCS2, N2) combination send.If packets need retransmits, transmitting terminal is reselected the combination of MCS and N according to current channel conditions.If current channel conditions does not change, (MCS2 N2), continues to retransmit in then still selection.If channel conditions becomes CS4, then should select (MCS4, N4), the continuation re-transmission.If channel conditions becomes CS3, then should choose (MCS3, N3), the continuation transmission.
In retransmission processes, under the variable situation of MCS rank, reselect the combination of MCS and N at every turn, always can choose the optimum combination under the current channel conditions.That is to say, selection (MCS, N) combination always (MCS1, N1), (MCS2, N2), (MCS3, N3), (MCS4, N4) this chooses in combination in 4.
Be the immovable example of MCS rank in the packet retransmission processes below:
As above shown in the table, unwrap when data and to start when sending, transmitting terminal is selected the combination of MCS and N according to the priority supreme principle according to channel conditions.If current channel conditions is CS2, transmitting terminal according to last table select (MCS2, N2) combination send.Retransmit if desired, transmit leg is reselected best maximum retransmission N under the constant prerequisite of MCS.If channel conditions becomes CS4, should select N4, being combined as of this moment (MCS2, N4).If channel conditions becomes CS3, then maximum retransmission should be selected N3, and being combined as of this moment (MCS2, N3).
In the packet retransmission processes, under the constant situation of MCS rank, can only under current MCS prerequisite, select the optimum N value according to channel conditions.In retransmission processes, channel conditions becomes CS4 by CS2 owing under the CS2 situation, selected MCS2, when therefore reselecting, can only (MCS2,?) the middle selection, (MCS2, N4) priority is the highest, so maximum retransmission is selected N4.
Claims (3)
1, a kind of chain circuit self-adaptive method based on adaptive coding and modulating and automatic repeat requests comprises:
Step 1 is created chnnel coding modulation scheme and the mapping table of maximum retransmission and channel condition or the curve chart of maximum retransmission and channel condition, with the chnnel coding modulation scheme selecting to be fit to and the maximum retransmission under this channel condition;
Step 2, create the function of chnnel coding modulation scheme and maximum retransmission and channel condition, to select suitable chnnel coding modulation scheme and the maximum retransmission under this channel condition according to channel condition, with the chnnel coding modulation scheme selecting to be fit to and the maximum retransmission under this channel condition, carry out the transmission of packet then;
Step 3 receives the affirmation information of described packet, judges according to described information whether needs resend described packet, if do not need, and end operation, otherwise,
Step 4, whether the number of retransmissions of judging described packet surpasses the maximum of system's permission or surpasses the maximum that current channel condition allows down, if surpass, end operation, otherwise redefine the transmission conditions of down channel, reselect suitable chnnel coding modulation scheme and the maximum retransmission under this channel condition according to described condition, described then step 3 continues the transmit operation of packet.
2, chain circuit self-adaptive method according to claim 1, it is characterized in that in described step 1 described chnnel coding modulation scheme that selection is fit to according to channel condition and the maximum retransmission under this channel condition replace with following step: selection is fit to the maximum retransmission under this channel condition according to channel condition.
3, chain circuit self-adaptive method according to claim 1 is characterized in that: the transmission conditions of described down channel are determined according to the signal interference ratio or the signal to noise ratio of channel.
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| CNB011422718A CN1213557C (en) | 2001-09-25 | 2001-09-25 | Link self adaptation method based on self adaptation coded modulation and automatic retransmission request |
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| CNB011422718A CN1213557C (en) | 2001-09-25 | 2001-09-25 | Link self adaptation method based on self adaptation coded modulation and automatic retransmission request |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100433611C (en) * | 2004-03-15 | 2008-11-12 | 华为技术有限公司 | A method for scheduling state report request data unit |
| CN100388643C (en) * | 2004-11-17 | 2008-05-14 | 华为技术有限公司 | Method for adjusting transmissive signalling power of re-transmissive request system automatically |
| US9385843B2 (en) * | 2004-12-22 | 2016-07-05 | Qualcomm Incorporated | Method and apparatus for using multiple modulation schemes for a single packet |
| CN101009538B (en) | 2006-01-26 | 2011-10-05 | 华为技术有限公司 | A data retransfer method and device |
| CN101247326B (en) * | 2007-02-16 | 2012-02-08 | 瑞昱半导体股份有限公司 | Wireless transmission device and correlated method |
| CN101277176B (en) * | 2008-05-15 | 2011-09-14 | 华为技术有限公司 | Method, equipment and system for adjusting mixed automatic retransmission time |
| CN103825688B (en) * | 2014-01-28 | 2017-02-22 | 南京邮电大学 | HARQ technology-based cross-layer design method in straight-through cellular system |
| EP2903195B1 (en) * | 2014-01-30 | 2019-07-03 | Alcatel Lucent | Communication techniques using a repetition regime in a coverage enhanced region |
| CN105281863B (en) * | 2014-06-30 | 2019-03-22 | 惠州市德赛西威汽车电子股份有限公司 | A kind of communication data frame transmission method |
| CN108282257A (en) * | 2017-01-06 | 2018-07-13 | 株式会社Ntt都科摩 | User terminal, feedback method at which, base station and method at which |
| CN109687937B (en) * | 2017-10-19 | 2021-08-06 | 普天信息技术有限公司 | Modulation coding mode and repetition frequency selection method and device |
| EP3704886A4 (en) * | 2017-10-30 | 2021-06-09 | Nokia Solutions and Networks Oy | Methods and apparatuses for repetition transmission |
| CN110831072B (en) * | 2019-10-28 | 2024-02-13 | 普联技术有限公司 | MCS (modulation and coding scheme) selection method and system based on WLAN (wireless local area network) |
| WO2024031395A1 (en) * | 2022-08-09 | 2024-02-15 | Oppo广东移动通信有限公司 | Repeated transmission methods, terminal devices, and network devices |
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