CN102970119A - Method for switching first transmission mode into second transmission mode - Google Patents
Method for switching first transmission mode into second transmission mode Download PDFInfo
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- CN102970119A CN102970119A CN2012104484118A CN201210448411A CN102970119A CN 102970119 A CN102970119 A CN 102970119A CN 2012104484118 A CN2012104484118 A CN 2012104484118A CN 201210448411 A CN201210448411 A CN 201210448411A CN 102970119 A CN102970119 A CN 102970119A
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Abstract
The invention provides a method for switching a first transmission mode into a second transmission mode. The method comprises that a network side receives a feedback signal form a terminal and judges whether the feedback signal confirms correctly-received characters or not when a terminal side meets a condition for switching the first transmission mode into the second transmission mode, if so, the network side transmits a radio resource control (RRC) reconfiguration message to the terminal side, and if not, the network side does not transmit the RRC reconfiguration message to the terminal side; the terminal switches the first transmission mode into the second transmission mode according to received RRC reconfiguration message. By adding setting of self-adaption judgment conditions among modes in a special scene, the terminal is ensured to meet a switched scene, simultaneously retransmission performed by the first transmission mode can be wholly and correctly translated when the scene has high error rate, and then switching operation is finished, so that switching success rate is improved, and small region capacity is ensured.
Description
Technical field
The present invention relates to transmission technique field in the communication system, relate in particular to a kind of method that is switched to the second transmission mode by the first transmission mode.
The background technology multi-antenna technology has obtained sufficient application in the TD-LTE system, not only the dual-mode antenna number has obvious increase, and the transmission mode of MIMO (Multi Input Multi Output) is also abundanter.While is environmental evolution because wireless channel is eated dishes without rice or wine, and the self adaptation between the different transmission mode is switched just become particularly important.
Under extreme case, subframe n adopts the first transmission mode (such as the TM8(DCI2B form)) transmission, handoff procedure between the beginning pattern after this subframe, and the transport block transmission mistake of subframe n, passed through large as far as possible number of retransmissions, to such an extent as to system has switched to the second transmission mode (such as the TM3(DCI2A form)), adopted the DCI2A form to begin transmission, have the transmission of DCI2B form this moment again, and UE can not detect.This moment, end side had the very high error rate, thereby had reduced cell throughout, had reduced spectrum efficiency.
Summary of the invention
(1) technical problem
The problem to be solved in the present invention is to guarantee that terminal is when satisfying handoff scenario and the high scene of the error rate occurs simultaneously, it is right that the re-transmission of being undertaken by the first transmission mode (such as the DCI2B form) can all be translated, and then finish the handover operation from the first transmission mode to the second transmission mode.
(2) technical scheme
The invention provides and a kind ofly switch to the method for the second transmission mode by the first transmission mode, the method comprises:
When end side satisfies when switching to the condition of the second transmission mode by the first transmission mode, the feedback signal that the network side receiving terminal returns judges whether this feedback signal confirms correctly to receive character, and if so, then network side issues the RRC reconfiguration message to end side; Otherwise network side does not issue the RRC reconfiguration message to end side;
End side switches to the second transmission mode according to the RRC reconfiguration message that receives by the first transmission mode.
Optionally, described method is used for the LTE communication system.
Optionally, described the first transmission mode is the TM8 transmission mode, and described the second transmission mode is the TM3 transmission mode.
Optionally, the method also comprises:
In the situation of the number of times that double fluid/SDM occurs more than or equal to the integer part of N/2, judge that whether lower second the code word spectrum efficiency summation of TM8 double fluid be more than or equal to the threshold value that is switched to transmission mode TM3 spectrum efficiency by transmission mode TM8 and the product that the number of times of double fluid/SDM occurs, if, then further judge whether ACK of the feedback of coming self terminal that network side receives, if not, then keep the TM8 double-stream mode.
Optionally, when judging that the feedback of coming self terminal that network side receives is not ACK, it is SFBC that RRC disposes current transmission mode, and continues to judge whether ACK of the feedback of coming self terminal that network side receives, until described feedback is when being ACK, transmission mode switches to the TM3 double-stream mode by the TM8 double fluid.
(3) technique effect
The present invention has improved handover success rate by increasing switching the setting of self-adaptive decision condition under the special screne between pattern, has guaranteed cell capacity; On the other hand, reduced the residual BLER of end side, thereby guaranteed that TCP/FTP etc. can correctly transmit retransmitting strict type of service, is of very high actual application value.
Description of drawings
Fig. 1 represents a kind of method flow diagram that is switched to the second transmission mode by the first transmission mode;
Fig. 2 represents a kind ofly to switch to the flow chart of TM3 based on the LTE communication system by TM8.
Embodiment
Embodiment 1:
Present embodiment provides a kind of and switches to the method for the second transmission mode by the first transmission mode, and as shown in Figure 1, the method comprises:
S1. end side judges whether to satisfy the condition that is switched to the second transmission mode by the first transmission mode;
S2. satisfy when switching to the condition of the second transmission mode by the first transmission mode when end side, the feedback signal that network side returns according to terminal judges whether this feedback signal confirms correctly to receive character, if, then carry out step S31: network side issues the RRC reconfiguration message to end side, otherwise carry out step S32: network side does not issue the RRC reconfiguration message to end side;
S4. end side switches to the second transmission mode according to the RRC reconfiguration message that receives by the first transmission mode;
S5. do not satisfy when switching to the condition of the second transmission mode by the first transmission mode when end side, then directly determine not switch;
Optionally, described method is used for the LTE communication system.Said method can be used the switching from TM8 to TM3, also can be applicable to from TM8 to other transmission modes such as the switching of TM7, TM6, TM5, TM4, TM3, TM2, TM1 etc., perhaps be applied to TM9 to the switching of other transmission modes such as TM8, TM7, TM6, TM5, TM4, TM3, TM2, TM1 etc.
Present embodiment is guaranteed not issue the RRC reconfiguration message before the correct transmission of uncertain data according to the transmission of the first transmission mode.And when confirming that the transmission according to the first transmission mode all finishes; No longer confirm afterwards other conditions, directly issue the RRC reconfiguration message and make transmission mode change the second transmission mode into, wait UE to return RRC and reshuffle and finish message, switch to the second transmission mode by the first transmission mode, so far, switch between pattern and finish.Present embodiment is by increasing switching the setting of self-adaptive decision condition under the special screne between pattern, guarantee that terminal is when satisfying handoff scenario and the high scene of the error rate occurs simultaneously, it is right that the re-transmission of being undertaken by the first transmission mode can all be translated, and then finish handover operation, improve handover success rate, guaranteed cell capacity; The on the other hand optimization of this algorithm has reduced the residual BLER of end side, thereby has guaranteed that TCP/FTP etc. can correctly transmit retransmitting strict type of service, is of very high actual application value.
Optionally, described the first transmission mode is the TM8 transmission mode, and described the second transmission mode is the TM3 transmission mode.Form 1 shows DCI form under the different transmission mode that provides the agreement constraint and the table of comparisons of MIMO mode thereof:
Optionally, the method also comprises:
In the situation of the number of times that double fluid/SDM occurs more than or equal to the integer part of N/2, judge that whether lower second the code word spectrum efficiency summation of TM8 double fluid be more than or equal to the threshold value that is switched to transmission mode TM3 spectrum efficiency by transmission mode TM8 and the product that the number of times of double fluid/SDM occurs, if, then further judge whether ACK of the feedback of coming self terminal that network side receives, if not, then keep the TM8 double-stream mode.
Optionally, when judging that the feedback of coming self terminal that network side receives is not ACK, it is SFBC that RRC disposes current transmission mode, and continues to judge whether ACK of the feedback of coming self terminal that network side receives, until described feedback is when being ACK, transmission mode switches to the TM3 double-stream mode by the TM8 double fluid.
Embodiment 2:
Present embodiment is based on the LTE mobile communication system, for 3GPP R9(Release9) the protocol requirement terminal supports transmission mode 8(TM8:Transmission Mode8) and comprise between the pattern of TM8 and switching, proposed a kind ofly novel to improve algorithm based on switching between the pattern of R9 terminal.This algorithm is intended to by corresponding self-adaptive decision condition is set, avoid in traditional handoff algorithms, network side has been finished TM8 and has been switched to the TM3 processing, if and end side this moment decoding error, stipulate according to agreement, to still adopt the TM8 transmission mode that just passes to carry out data re-transmission, and because down control channel DCI(Downlink Control Information under two kinds of transmission modes) difference of form, thus bring operational decoding error.New algorithm switches transition state and increases Rule of judgment by arranging, but handover success rate between the Effective Raise pattern reduces the error rate, increases cell throughout.
The TM8 that hereinafter relates in the present invention states the concrete technical scheme of present embodiment in detail toward the TM3 handoff algorithms as example, as shown in Figure 2:
The given first parameter-definition:
● lower second the code word spectrum efficiency summation of eff_all_tm8_dual2:TM8 double fluid;
● N: judge broadband/subband CQI number of cycles;
● N_SDM: judge the number of times that double fluid/SDM occurs;
● T_CQI: broadband/subband CQI report cycle;
● eff_tm83:TM8 cuts the threshold value of TM3 spectrum efficiency, by the network side setting;
● eff_out2: revise rear second spectral efficiency values that code word is corresponding, if be single current, it is invalid then should to be worth;
● the T_CQI:CQI cycle, by the network side setting.
Secondly parameter is carried out initialization:
●eff_all_tm8_dual2=0；
●N=0；
●N_CQI=ceil(5000ms/T_CQI)。
Provide at last concrete steps:
1) the current transmission mode of if is TM8
2) in each broadband/subband CQI periodic report time point
2）N=N+1；
2) the MIMO mode of the current employing of if is dual-stream beamforming
3）eff_all_tm8_dual2=eff_all_tm8_dual2+eff_out2；
3）N_SDM=N_SDM+1；
2）end
/ * judges once whether should carry out switching between pattern every time of 5s, with associated counter zero clearing */
2）if（N==N_CQI）
If better performances and the double fluid of second code word of/* TM8 occupy the majority, */
3）if（eff_all_tm8_dual2>=eff_tm83*N_SDM）&&(N_SDM>=ceil(N/2))
4) the if(network side receives that terminal feedback is ACK)
TM8 switches to TM3
4）else
The MIMO mode of TM8 changes SFBC into, guarantees that the transmission of DCI2B form correctly finishes;
4）end
3）else
Still the transmission mode that keeps TM8;
3）end
3）N=0;
3）eff_all_tm8_dual2=0;
2）end
1）end。
The pattern 8 that present embodiment is corresponding arrives the changing method of mode 3, increased the act setting of condition of special screne, by the transition of the DCI1A form that mode 3 and pattern 8 all exist is set, guarantee when terminal satisfies handoff scenario and the high scene of the error rate occurs simultaneously, it is right that the re-transmission of being undertaken by the DCI2B form can all be translated, and then switch to TM3.
In terms of existing technologies, the described technical scheme of present embodiment guarantees that the transmission of DCI2B form finished before TM8 switches to TM3 fully, namely before the correct transmission of data of uncertain DCI2B form transmission, does not issue the RRC reconfiguration message.So, satisfying TM8 to the moment that TM3 switches, change the MIMO mode of TM8 into SFBC, keep the as far as possible long time, all finish until confirm the transmission of DCI2B form; Have another problem this moment, the MIMO mode of this moment is SFBC all, does not satisfy condition: (eff_all_tm8_dual2 〉=eff_tm83*N_SDM); ﹠amp; (N_SDM 〉=ceil (N/2)), and then can not switch to TM3 from TM8.Therefore, the present invention has further improved switching flow, when the transmission of confirming the DCI2B form all finishes; No longer confirm afterwards other conditions, directly issue the RRC reconfiguration message and make transmission mode change TM3 into that wait UE to return RRC and reshuffle and finish message, the MIMO mode changes SDM into, so far, switch between pattern and finish.
On the one hand perfect transmission mode M8 for the R9 terminal improves algorithm to the switching of transmission mode M3, by increasing switching the setting of self-adaptive decision condition under the special screne between pattern, guarantee that terminal is when satisfying handoff scenario and the high scene of the error rate occurs simultaneously, it is right that the re-transmission of being undertaken by the DCI2B form can all be translated, and then finish handover operation, improve handover success rate, guaranteed cell capacity; The on the other hand optimization of this algorithm has reduced the residual BLER of end side, thereby has guaranteed that TCP/FTP etc. can correctly transmit retransmitting strict type of service, is of very high actual application value.
Above execution mode only is used for explanation the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; in the situation that does not break away from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (5)
1. one kind switches to the method for the second transmission mode by the first transmission mode, it is characterized in that the method comprises:
When end side satisfies when switching to the condition of the second transmission mode by the first transmission mode, the feedback signal that the network side receiving terminal returns, and judge whether this feedback signal confirms correctly to receive character, and if so, then network side issues the RRC reconfiguration message to end side; Otherwise network side does not issue the RRC reconfiguration message to end side;
End side switches to the second transmission mode according to the RRC reconfiguration message that receives by the first transmission mode.
2. the method for claim 1 is further characterized in that, described method is used for the LTE communication system.
3. method as claimed in claim 2 is further characterized in that, described the first transmission mode is the TM8 transmission mode, and described the second transmission mode is the TM3 transmission mode.
4. method as claimed in claim 3 is characterized in that, the method also comprises:
In the situation of the number of times that double fluid/SDM occurs more than or equal to the integer part of N/2, N is broadband/subband CQI number of cycles, judge that whether lower second the code word spectrum efficiency summation of TM8 double fluid be more than or equal to the threshold value that is switched to transmission mode TM3 spectrum efficiency by transmission mode TM8 and the product that the number of times of double fluid/SDM occurs, if, then further judge whether ACK of the feedback of coming self terminal that network side receives, if not, then keep the TM8 double-stream mode.
5. method as claimed in claim 4 is characterized in that,
When judging that the feedback of coming self terminal that network side receives is not ACK, it is SFBC that RRC disposes current transmission mode, and continue to judge whether ACK of the feedback of coming self terminal that network side receives, until described feedback is when being ACK, transmission mode switches to the TM3 double-stream mode by the TM8 double fluid.
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| CN201210448411.8A CN102970119B (en) | 2012-11-09 | 2012-11-09 | A kind of method being switched to the second transmission mode by the first transmission mode |
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Cited By (6)
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| CN104185206A (en) * | 2013-05-23 | 2014-12-03 | 中兴通讯股份有限公司 | Transmission mode switching method and device |
| CN107302414A (en) * | 2016-04-14 | 2017-10-27 | ***通信有限公司研究院 | A kind of transmission mode adaptive method for switching and device |
| CN108234006A (en) * | 2016-12-22 | 2018-06-29 | 大唐移动通信设备有限公司 | TM8 transmission modes configuration UE reports method and the base station of PMI and RI |
| WO2018201473A1 (en) * | 2017-05-05 | 2018-11-08 | 富士通株式会社 | Acknowledgment apparatus for activation command, and apparatus and method for reporting data transmission mode |
| CN110620991A (en) * | 2018-06-19 | 2019-12-27 | 宏达国际电子股份有限公司 | Communication system, head-mounted display and method for switching transmission mode thereof |
| CN113115466A (en) * | 2021-03-26 | 2021-07-13 | 联想(北京)有限公司 | Method and device for controlling downlink transmission mode |
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| CN102484557A (en) * | 2009-07-30 | 2012-05-30 | 晶像股份有限公司 | Signaling For Transitions Between Modes Of Data Transmission |
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| US20020119757A1 (en) * | 2001-02-28 | 2002-08-29 | Kojiro Hamabe | Mobile communication system and transmission mode switching method used therefor as well as recording medium having program of the same method recorded therein |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104185206A (en) * | 2013-05-23 | 2014-12-03 | 中兴通讯股份有限公司 | Transmission mode switching method and device |
| CN104185206B (en) * | 2013-05-23 | 2019-02-12 | 中兴通讯股份有限公司 | A kind of switching method and device of transmission mode |
| CN107302414A (en) * | 2016-04-14 | 2017-10-27 | ***通信有限公司研究院 | A kind of transmission mode adaptive method for switching and device |
| CN108234006A (en) * | 2016-12-22 | 2018-06-29 | 大唐移动通信设备有限公司 | TM8 transmission modes configuration UE reports method and the base station of PMI and RI |
| CN108234006B (en) * | 2016-12-22 | 2020-07-24 | 大唐移动通信设备有限公司 | Method and base station for configuring UE (user equipment) reporting PMI (PMI indication) and RI (Ri indication) in TM8 (Transmission mode) |
| WO2018201473A1 (en) * | 2017-05-05 | 2018-11-08 | 富士通株式会社 | Acknowledgment apparatus for activation command, and apparatus and method for reporting data transmission mode |
| CN110620991A (en) * | 2018-06-19 | 2019-12-27 | 宏达国际电子股份有限公司 | Communication system, head-mounted display and method for switching transmission mode thereof |
| CN110620991B (en) * | 2018-06-19 | 2021-08-10 | 宏达国际电子股份有限公司 | Communication system, head-mounted display and method for switching transmission mode thereof |
| CN113115466A (en) * | 2021-03-26 | 2021-07-13 | 联想(北京)有限公司 | Method and device for controlling downlink transmission mode |
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| CN102970119B (en) | 2016-01-27 |
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