CN102970119B - A kind of method being switched to the second transmission mode by the first transmission mode - Google Patents
A kind of method being switched to the second transmission mode by the first transmission mode Download PDFInfo
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- CN102970119B CN102970119B CN201210448411.8A CN201210448411A CN102970119B CN 102970119 B CN102970119 B CN 102970119B CN 201210448411 A CN201210448411 A CN 201210448411A CN 102970119 B CN102970119 B CN 102970119B
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Abstract
The invention provides a kind of method being switched to the second transmission mode by the first transmission mode, the method comprises: when end side meet switch to the condition of the second transmission mode by the first transmission mode time, during the feedback signal that network side receiving terminal returns, judge whether this feedback signal confirms correctly to receive character, if so, then network side issues RRC reconfiguration message to end side; Otherwise network side does not issue RRC reconfiguration message to end side; End side, according to the RRC reconfiguration message received, is switched to the second transmission mode by the first transmission mode.The present invention is by increasing the setting switching self-adaptive decision condition under special screne between pattern, ensure that terminal is when meeting handoff scenario and occur the high scene of the error rate simultaneously, it is right that the re-transmission undertaken by the first transmission mode can all be translated, and then complete handover operation, improve handover success rate, ensure that cell capacity.
Description
Technical field
The present invention relates to transmission technique field in communication system, particularly relate to a kind of method being switched to the second transmission mode by the first transmission mode.
Background technology multi-antenna technology obtains sufficient application in TD-LTE system, and not only dual-mode antenna number has obvious increase, and the transmission mode of MIMO (MultiInputMultiOutput) is also abundanter.Simultaneously because wireless channel is eated dishes without rice or wine the change of environment, the self adaptation between different transmission mode switches just become particularly important.
In extreme circumstances, subframe n adopts the first transmission mode (as TM8(DCI2B form)) transmission, handoff procedure between pattern is started after this subframe, and the transport block transmission mistake of subframe n, have passed through number of retransmissions large as far as possible, to such an extent as to system is switched to the second transmission mode (as TM3(DCI2A form)), have employed DCI2A form and start transmission, now have the transmission of DCI2B form again, UE can not detect.Now end side has the very high error rate, thus reduces cell throughout, reduces spectrum efficiency.
Summary of the invention
(1) technical problem
The problem to be solved in the present invention ensures that terminal is when meeting handoff scenario and occur the high scene of the error rate simultaneously, it is right that the re-transmission undertaken by the first transmission mode (as DCI2B form) can all be translated, and then complete the handover operation from the first transmission mode to the second transmission mode.
(2) technical scheme
The invention provides a kind of method being switched to the second transmission mode by the first transmission mode, the method comprises:
When end side meet switch to the condition of the second transmission mode by the first transmission mode time, the feedback signal that network side receiving terminal returns, judge whether this feedback signal confirms correctly to receive character, if so, then network side issues RRC reconfiguration message to end side; Otherwise network side does not issue RRC reconfiguration message to end side;
End side, according to the RRC reconfiguration message received, is switched to the second transmission mode by the first transmission mode.
Optionally, described method is used in LTE communication system.
Optionally, described first transmission mode is TM8 transmission mode, and described second transmission mode is TM3 transmission mode.
Optionally, the method also comprises:
When occurring that the number of times of double fluid/SDM is more than or equal to the integer part of N/2, judge whether lower second the code word spectrum efficiency summation of TM8 double fluid is more than or equal to the threshold value that is switched to transmission mode TM3 spectrum efficiency by transmission mode TM8 and the product of number of times occurring double fluid/SDM, if, then judge the feedback carrying out self terminal that network side receives whether ACK further, if not, then TM8 double-stream mode is kept.
Optionally, when the feedback carrying out self terminal judging that network side receives is not ACK, it is SFBC that RRC configures current transmission mode, and continues to judge the feedback carrying out self terminal that network side receives whether ACK, until when described feedback is ACK, transmission mode is switched to TM3 double-stream mode by TM8 double fluid.
(3) technique effect
The present invention, by increasing the setting switching self-adaptive decision condition under special screne between pattern, improves handover success rate, ensure that cell capacity; On the other hand, reduce the residual BLER of end side, thus ensure that TCP/FTP etc. can correctly transmit the type of service that repeat request is strict, be of very high actual application value.
Accompanying drawing explanation
Fig. 1 represents a kind of method flow diagram being switched to the second transmission mode by the first transmission mode;
Fig. 2 represents a kind of flow chart being switched to TM3 by TM8 based on LTE communication system.
Embodiment
Embodiment 1:
The present embodiment provides a kind of method being switched to the second transmission mode by the first transmission mode, and as shown in Figure 1, the method comprises:
S1. end side judges whether to meet the condition being switched to the second transmission mode by the first transmission mode;
S2. when end side meet switch to the condition of the second transmission mode by the first transmission mode time, according to the feedback signal that terminal returns, network side judges whether this feedback signal confirms correctly to receive character, if, then carry out step S31: network side issues RRC reconfiguration message to end side, otherwise, carry out step S32: network side does not issue RRC reconfiguration message to end side;
S4. end side is according to the RRC reconfiguration message received, and is switched to the second transmission mode by the first transmission mode;
S5. when end side do not meet switch to the condition of the second transmission mode by the first transmission mode time, then directly determine not switch;
Optionally, described method is used in LTE communication system.Said method can apply the switching from TM8 to TM3, also can be applicable to the switching as TM7, TM6, TM5, TM4, TM3, TM2, TM1 etc. from TM8 to other transmission modes, or be applied to TM9 to the switching of other transmission modes as TM8, TM7, TM6, TM5, TM4, TM3, TM2, TM1 etc.
The present embodiment is guaranteed, before the uncertain data according to the first transmission mode transmission are correctly transmitted, not issue RRC reconfiguration message.And when confirming all to terminate according to the transmission of the first transmission mode; No longer confirm other conditions afterwards, directly issue RRC reconfiguration message and make transmission mode change the second transmission mode into, wait UE to return RRC and reshuffled message, switch to the second transmission mode by the first transmission mode, so far, switched between pattern.The present embodiment is by increasing the setting switching self-adaptive decision condition under special screne between pattern, ensure that terminal is when meeting handoff scenario and occur the high scene of the error rate simultaneously, it is right that the re-transmission undertaken by the first transmission mode can all be translated, and then complete handover operation, improve handover success rate, ensure that cell capacity; The optimization of this algorithm, reduces the residual BLER of end side, thus ensure that TCP/FTP etc. can correctly transmit the type of service that repeat request is strict, be of very high actual application value on the other hand.
Optionally, described first transmission mode is TM8 transmission mode, and described second transmission mode is TM3 transmission mode.Form 1 display provides the table of comparisons of DCI format under the different transmission mode of protocol and MIMO method thereof:
Form 1
Optionally, the method also comprises:
When occurring that the number of times of double fluid/SDM is more than or equal to the integer part of N/2, judge whether lower second the code word spectrum efficiency summation of TM8 double fluid is more than or equal to the threshold value that is switched to transmission mode TM3 spectrum efficiency by transmission mode TM8 and the product of number of times occurring double fluid/SDM, if, then judge the feedback carrying out self terminal that network side receives whether ACK further, if not, then TM8 double-stream mode is kept.
Optionally, when the feedback carrying out self terminal judging that network side receives is not ACK, it is SFBC that RRC configures current transmission mode, and continues to judge the feedback carrying out self terminal that network side receives whether ACK, until when described feedback is ACK, transmission mode is switched to TM3 double-stream mode by TM8 double fluid.
Embodiment 2:
The present embodiment is based on LTE mobile communication system, for 3GPPR9(Release9) protocol requirement terminal supports transmission mode 8(TM8:TransmissionMode8) and comprise TM8 pattern between switch, propose between a kind of novel pattern based on R9 terminal and switch innovatory algorithm.This algorithm is intended to by arranging corresponding self-adaptive decision condition, avoid in traditional handoff algorithms, network side has completed TM8 and has switched to TM3 process, if and end side now decoding error, specify according to agreement, to the TM8 transmission mode just passed still be adopted to carry out data re-transmission, and due to down control channel DCI(DownlinkControlInformation under two kinds of transmission modes) difference of form, thus bring operational decoding error.New algorithm switches transition state by arranging and increases Rule of judgment, can effectively improve handover success rate between pattern, reduces the error rate, increases cell throughout.
Hereafter state the concrete technical scheme of the present embodiment in detail toward TM3 handoff algorithms for the TM8 related in the present invention, as shown in Figure 2:
First parameter definition is provided:
● 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 occurring double fluid/SDM;
● T_CQI: broadband/subband CQI report cycle;
● eff_tm83:TM8 cuts the threshold value of TM3 spectrum efficiency, is arranged by network side;
● eff_out2: revise the spectral efficiency values that rear second code word is corresponding, if be single current, then this value is invalid;
● in the T_CQI:CQI cycle, arranged by network side.
Secondly initialization is carried out to parameter:
●eff_all_tm8_dual2=0；
●N=0；
●N_CQI=ceil(5000ms/T_CQI)。
Finally provide concrete steps:
1) transmission mode that if is current is TM8
2) in each broadband/subband CQI periodic report time point
2）N=N+1；
2) MIMO method 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
/ * every 5s time judge once whether should carry out switching between pattern, associated counter is reset */
2）if（N==N_CQI）
If the better performances of/* TM8 second code word and double fluid occupy the majority, */
3）if（eff_all_tm8_dual2>=eff_tm83*N_SDM）&&(N_SDM>=ceil(N/2))
4) if(network side receives terminal feedback is ACK)
TM8 switches to TM3
4）else
The MIMO method of TM8 changes SFBC into, ensures that the transmission of DCI2B form correctly terminates;
4）end
3）else
Still the transmission mode of TM8 is kept;
3）end
3）N=0;
3）eff_all_tm8_dual2=0;
2）end
1）end。
The pattern 8 that the present embodiment is corresponding arrives the changing method of mode 3, add the setting to judgment condition under special screne, by arranging the transition of the DCI1A form that mode 3 and pattern 8 all exist, ensure terminal meet handoff scenario there is the high scene of the error rate simultaneously time, it is right that the re-transmission undertaken by DCI2B form can all be translated, and then switch to TM3.
In terms of existing technologies, technical scheme described in the present embodiment guarantees that the transmission of DCI2B form terminated before TM8 is switched to TM3 completely, namely before the data of uncertain DCI2B format transmission are correctly transmitted, does not issue RRC reconfiguration message.So, when meet TM8 switch to TM3 when, change the MIMO method of TM8 into SFBC, keep the as far as possible long time, until confirm that the transmission of DCI2B form all terminates; Now there is another problem, MIMO method is now all SFBC, do not satisfy condition: (eff_all_tm8_dual2>=eff_tm83*N_SDM) & & (N_SDM>=ceil (N/2)), and then TM3 can not be switched to from TM8.Therefore, the present invention further improves switching flow, when confirming that the transmission of DCI2B form all terminates; No longer confirm other conditions afterwards, directly issue RRC reconfiguration message and make transmission mode change TM3 into, wait UE to return RRC and reshuffled message, MIMO method changes SDM into, so far, has switched between pattern.
The on the one hand perfect switching innovatory algorithm for the transmission mode M8 to transmission mode M3 of R9 terminal, by increasing the setting switching self-adaptive decision condition under special screne between pattern, ensure that terminal is when meeting handoff scenario and occur the high scene of the error rate simultaneously, it is right that the re-transmission undertaken by DCI2B form can all be translated, and then complete handover operation, improve handover success rate, ensure that cell capacity; The optimization of this algorithm, reduces the residual BLER of end side, thus ensure that TCP/FTP etc. can correctly transmit the type of service that repeat request is strict, be of very high actual application value on the other hand.
Above execution mode is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes 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. switched to a method for the second transmission mode by the first transmission mode, it is characterized in that, the method comprises:
When end side meet switch to the condition of the second transmission mode by the first transmission mode time, the feedback signal that network side receiving terminal returns, and judge whether this feedback signal confirms correctly to receive character, if so, then network side issues RRC reconfiguration message to end side; Otherwise network side does not issue RRC reconfiguration message to end side;
End side, according to the RRC reconfiguration message received, is switched to the second transmission mode by the first transmission mode;
When end side do not meet switch to the condition of the second transmission mode by the first transmission mode time, then directly determine not switch;
After confirmation all terminates according to the transmission of the first transmission mode, no longer confirm other conditions, network side directly issues RRC reconfiguration message makes transmission mode change the second transmission mode into, when network side receive RRC that terminal returns reshuffled message time, switch to the second transmission mode by the first transmission mode.
2. the method for claim 1, is further characterized in that, described method is used in LTE communication system.
3. method as claimed in claim 2, be further characterized in that, described first transmission mode is TM8 transmission mode, and described second transmission mode is TM3 transmission mode.
4. method as claimed in claim 3, it is characterized in that, the method also comprises:
When occurring that the number of times of double fluid/SDM is more than or equal to the integer part of N/2, N is broadband/subband CQI number of cycles, judge whether lower second the code word spectrum efficiency summation of TM8 double fluid is more than or equal to the threshold value that is switched to transmission mode TM3 spectrum efficiency by transmission mode TM8 and the product of number of times occurring double fluid/SDM, if, then judge the feedback carrying out self terminal that network side receives whether ACK further, if not, then TM8 double-stream mode is kept.
5. method as claimed in claim 4, is characterized in that,
When the feedback carrying out self terminal judging that network side receives is not ACK, it is SFBC that RRC configures current transmission mode, and continue to judge the feedback carrying out self terminal that network side receives whether ACK, until when described feedback is ACK, transmission mode is switched to TM3 double-stream mode by TM8 double fluid.
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Families Citing this family (6)
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| 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 |
| CN107302414B (en) * | 2016-04-14 | 2020-06-19 | 中国移动通信有限公司研究院 | Transmission mode self-adaptive switching method and device |
| 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) |
| CN110268770A (en) * | 2017-05-05 | 2019-09-20 | 富士通株式会社 | The reporting device and method for confirming device, data-transmission mode of activation command |
| TWI739117B (en) * | 2018-06-19 | 2021-09-11 | 宏達國際電子股份有限公司 | Communication system, head mounted display, and method for switching a transmission mode |
| 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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| CN101969369A (en) * | 2009-07-27 | 2011-02-09 | 中兴通讯股份有限公司 | Method, system and device for switching multiple input/multiple output (MIMO) transmission modes |
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