CN102377538A - Self-adaptive switching method and system - Google Patents

Self-adaptive switching method and system Download PDF

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CN102377538A
CN102377538A CN2010102527139A CN201010252713A CN102377538A CN 102377538 A CN102377538 A CN 102377538A CN 2010102527139 A CN2010102527139 A CN 2010102527139A CN 201010252713 A CN201010252713 A CN 201010252713A CN 102377538 A CN102377538 A CN 102377538A
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base station
spectrum efficiency
terminal
last time
mcs
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CN102377538B (en
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姚春峰
王希维
张娟
刘巧艳
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems

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Abstract

The invention discloses a self-adaptive switching method and system. The method comprises the following steps: when a rank indicator (RI) reported last by a terminal is different from an RI used for the data transmission of a previous frame of a base station, estimating the spectral efficiency of a transmission mode corresponding to the RI reported last by the terminal; and if the estimated spectral efficiency is higher than the spectral efficiency of a transmission mode corresponding to the RI used for the previous frame of the base station, transmitting data by means of the RI reported last by the terminal for the current frame of the base station. In the invention, when the RI for the data transmission of the previous frame of the base station and the RI reported last by UE are different from each other, the spectral efficiencies corresponding to the two transmission modes are respectively estimated and compared, and the transmission mode having a higher spectral efficiency is selected, thereby effectively improving the system throughput.

Description

A kind of adaptive method for switching and system
Technical field
The present invention relates to communication technical field, more specifically, relate to a kind of adaptive method for switching and system.
Background technology
MIMO (Multi-input Multi-output, multiple-input and multiple-output) technology in LTE (Long Term Evolution, the Long Term Evolution) system is to use a plurality of transmitting antenna (N T) and a plurality of reception antenna (N R) Radio Transmission Technology, can improve the capacity and the link transmission performance of wireless network effectively.
For two antenna LTE system downlink transfer mode 3s, can adopt two kinds of MIMO technology of transmit diversity and spatial reuse to transmit.Wherein RI (Rank Indication, order designator) equals 1 corresponding transmit diversity mode, and RI equals 2 corresponding spatial multiplexing mode.Transmit diversity is with respect to spatial reuse performance robust more, and spatial reuse can reach higher peak rate with respect to transmit diversity, therefore, need select two kinds of send modes according to the actual channel situation.
A kind of handoff algorithms of transmission mode 3 is provided in the prior art, and this algorithm basic principle is: the RI that uses when the value of reporting of the RI that occurs several times UE (User Equipment, subscriber equipment) continuously and current base station then switches not simultaneously.For example: the RI=1 that current base station is used, UE reports RI=2 continuously 3 times, then switches to RI=2.
The subject matter that above-mentioned handoff algorithms exists is: the switching of RI only depends on the characteristic that UE reports the RI sequence, and does not consider the influence of spectrum efficiency (the original bit number that transmits on the spectrum efficiency unit of the being defined as subcarrier among this paper) to the MIMO mode switch.
Summary of the invention
The technical problem that the present invention solves provides a kind of adaptive method for switching and system, can select the higher MIMO transmission means of spectrum efficiency, effectively improves throughput of system.
For solving the problems of the technologies described above, the invention provides a kind of adaptive method for switching, said method comprises:
RI that data use is sent when inconsistent in the order designator (RI) that reports when terminal the last time and former frame base station; Estimate the spectrum efficiency of the send mode of the RI correspondence that said terminal the last time reports; If this spectrum efficiency that estimates is higher than the spectrum efficiency of the corresponding send mode of the RI that uses the former frame base station, then this frame of base station RI of adopting said terminal the last time to report sends data.
Further, it is consistent that the RI that data use is sent in the RI that reports when said terminal the last time and former frame base station; Perhaps; The RI that RI that said terminal the last time reports and former frame base station transmission data are used is inconsistent; But when this spectrum efficiency that estimates was equal to or less than the spectrum efficiency of the corresponding send mode of the RI of former frame base station use, the RI that this frame of base station still adopts former frame to use sent data.
Further, when the value of outer shroud adjustment parameter less than 0 the time, judge that then the said spectrum efficiency that estimates is higher than the spectrum efficiency of the corresponding send mode of the RI that uses the former frame base station.
Further, the different value condition of the RI that data use are sent in RI that reports according to said terminal the last time and former frame base station, respectively statistics of error rate BLER and obtain described value.
Further; The RI that statistics reported when said terminal the last time equals 2 and the number of times that RI that data use equals 1 is sent in the former frame base station; The spectrum efficiency that surpasses the corresponding send mode of RI that predetermined threshold and said terminal the last time report when the number of times of statistics is during greater than the corresponding spectrum efficiency of the spendable maximum MCS of diversity mode, and then this frame of base station RI of adopting said terminal the last time to report sends data.
The present invention also provides a kind of self adaptation switched system, is applied to long evolving system (LTE) downlink transfer mode 3, and said system comprises order designator comparing unit and the handover decisions unit in the base station, wherein:
Said order designator comparing unit, whether being used for RI that comparison terminal the last time reports and former frame base station, to send the RI that data use consistent, as if inconsistent, then with inconsistent result notification handover decisions unit;
Said handover decisions unit; After being used to receive said inconsistent result; Estimate the spectrum efficiency of the send mode of the RI correspondence that said terminal the last time reports; If this spectrum efficiency that estimates is higher than the spectrum efficiency of the send mode of the RI correspondence of using the former frame base station, the RI that then determines this frame of base station to adopt said terminal the last time to report sends data.
Further, said order designator comparing unit also is used for, if it is consistent to judge the RI that RI that said terminal the last time reports and former frame base station sends the data use, then with the said handover decisions of the result notification of unanimity unit;
Said handover decisions unit also is used for, and according to the result of said unanimity, the RI that this frame of decision base station still adopts former frame to use sends data.
Further; Said handover decisions unit also is used for; After receiving said inconsistent result, if the said spectrum efficiency that estimates is equal to or less than the spectrum efficiency of the send mode of the RI correspondence of using the former frame base station, the RI that then determines this frame of base station still to adopt former frame to use sends data.
Further, said system also comprises outer shroud adjustment parameter acquiring unit,
Said outer shroud adjustment parameter acquiring unit is used for, and the different value condition of the RI that data use are sent in the RI that reports according to said terminal the last time and former frame base station, respectively statistics of error rate BLER and obtain the value that outer shroud is adjusted parameter;
Said handover decisions unit is further used for, when the value of outer shroud adjustment parameter less than 0 the time, judge that then the said spectrum efficiency that estimates is higher than the spectrum efficiency of the corresponding send mode of the RI that uses the former frame base station.
Further; Said handover decisions unit also is used for; The RI that statistics reported when said terminal the last time equals 2 and the number of times that RI that data use equals 1 is sent in the former frame base station; The spectrum efficiency that surpasses the corresponding send mode of RI that predetermined threshold and said terminal the last time report when the number of times of statistics is during greater than the corresponding spectrum efficiency of the spendable maximum MCS of diversity mode, and the RI that then determines this frame of base station to adopt said terminal the last time to report sends data.
The situation of the RI that the present invention sends data according to the previous frame base station RI and UE the last time report if both RI are inconsistent, is then estimated respectively and two kinds of spectrum efficiencies that send modes are corresponding relatively, and is determined whether to carry out switching according to comparative result; In addition, when the spectrum efficiency of estimation correspondence,, select the higher send mode of spectrum efficiency, improved throughput of system effectively in conjunction with outer shroud adjustment parameter.
Description of drawings
Fig. 1 is the method flow sketch map that the interior self adaptation of the LTE downlink transfer mode 3 of the embodiment of the invention is switched.
Embodiment
Basic ideas of the present invention are; A kind of adaptive method for switching is provided; Be applied to LTE downlink transfer mode 3, its core content comprises: send RI that RI and UE the last time of data report when inconsistent when the previous frame base station, estimate the spectrum efficiency of transmit diversity and two kinds of send modes of spatial reuse respectively; And select the higher MIMO send mode of spectrum efficiency, thereby can improve throughput of system effectively.
Particularly, the present invention combines existing AMC (Adaptive Modulation and Coding, Adaptive Modulation and Coding technology) outer shroud adjustment parameter DeltaMCS (also claiming Δ MCS), estimates the spectrum efficiency of transmit diversity and two kinds of send modes of spatial reuse.
The existing basic principle of obtaining AMC outer shroud adjustment parameter Δ MCS is:
The first step: initial value, Δ MCS maximum, Δ MCS minimum value, BLER (Block Error Ratio, Block Error Rate) higher limit and the BLER lower limit of confirming Δ MCS.
Wherein, the initial value of Δ MCS is 0, Δ MCS maximum (span 1-10), minimum value (span-20 is to-1), BLER higher limit (span 15% to 50%), BLER lower limit (span 0% to 8%).
Second step: be lower than lower limit if the sampled value of BLER (sampling periods 10 to 100 sub-frame) N continuous (span 1-10) is inferior, then Δ MCS adds 1, but is no more than Δ MCS maximum; If the inferior higher limit that is higher than of the continuous K of the sampled value of BLER (span 1-10), then Δ MCS subtracts 1, but is not less than Δ MCS minimum value; Other situation then Δ MCS remain unchanged.
Among the present invention; Send the situation of the RI that RI and UE the last time of data report according to the previous frame base station; Adopt four AMC outer shroud adjustment parameters to carry out the switching of MIMO sending mode respectively; Be designated as Δ MCS1, Δ MCS2, Δ MCS3 and Δ MCS4 respectively, and provide corresponding outer loop parameter to obtain flow process.And the algorithm principle between each flow process is consistent, and relevant parameter is independent, and Δ MCS1, Δ MCS2, Δ MCS3 and Δ MCS4 obtain according to BLER1, BLER2, BLER3 and BLER4 respectively.BLER1, BLER2, BLER3 and BLER4 then calculate through corresponding with it ACK (Acknowledgement confirms)/NACK (Negative Acknowledgement does not confirm).
Based on above-mentioned thinking, the present invention provides a kind of adaptive method for switching, specifically adopts following technical scheme:
RI that data use is sent when inconsistent in RI that reports when terminal the last time and former frame base station; Estimate the spectrum efficiency of the send mode of the RI correspondence that said terminal the last time reports; If this spectrum efficiency that estimates is higher than the spectrum efficiency of the corresponding send mode of the RI that uses the former frame base station, then this frame of base station RI of adopting said terminal the last time to report sends data.
Further, it is consistent that the RI that data use is sent in the RI that reports when terminal the last time and former frame base station;
Perhaps; The RI that RI that terminal the last time reports and former frame base station transmission data are used is inconsistent; But when this spectrum efficiency that estimates was equal to or less than the spectrum efficiency of the corresponding send mode of the RI of former frame base station use, the RI that this frame of base station still adopts former frame to use sent data.
Wherein, need to prove that the terminal is not that every frame all reports RI, for example: UE reports RI=1 at the t frame, and UE reports RI=2 at the t+4 frame, so, thinks among this paper to be 1 at the t+1 frame to the RI of t+3 frame terminal to report, i.e. the RI that reports of UE the last time.
Further, when the value of outer shroud adjustment parameter Δ MCS less than 0 the time, judge that then the said spectrum efficiency that estimates is higher than the spectrum efficiency of the corresponding send mode of the RI that uses the former frame base station.
Further, the different value condition of the RI that data use are sent in RI that reports according to said terminal the last time and former frame base station, respectively statistics of error rate BLER and obtain the value of said Δ MCS.
Further; The RI that statistics reported when said terminal the last time equals 2; The number of times that the RI that former frame base station transmission data are used equals 1; The spectrum efficiency that surpasses the corresponding send mode of RI that predetermined threshold and said terminal the last time report when the number of times of statistics is during greater than the corresponding spectrum efficiency of the spendable maximum MCS of diversity mode, and then this frame of base station RI of adopting said terminal the last time to report sends data.
Particularly, send the RI and the value condition that UE the last time reports RI of data according to the former frame base station, following four flow processs (be scheduled for the first time for UE, think that RI and UE the last time of former frame base station transmission data reports the value of RI identical) are provided respectively.
Flow process A:
If the former frame base station send the RI of data equal 1 and the RI that reports of UE the last time equal 1, then get into switching flow A.Flow process A is divided into following step:
Steps A 1: the spectrum efficiency that certain MCS is corresponding is the most approaching with the spectrum efficiency that reports CQI (Channel Quality Indicator, CQI) correspondence, then this MCS is designated as MCS Init
Steps A 2: the MCS that data are sent in final base station is:
MCS use＝max(min((MCS init+ΔMCS1)，MCS_Max)，MCS_Min)
Wherein the MCS maximum of MCS_Max presentation protocol regulation is 28 for the LTE system.The MCS minimum value of MCS_Min presentation protocol regulation is 0 for the LTE system.
Steps A 3: this frame of base station uses RI to equal 1 and sends data.
The ACK/NACK of this frame of steps A 4:UE feedback is used to add up and calculate to BLER1 that should flow process and obtains outer loop parameter Δ MCS1.
Flow process B:
If the former frame base station send the RI of data equal 2 and the RI that reports of UE the last time equal 2, then get into switching flow B.Flow process B is divided into following step:
Step B1: the spectrum efficiency that certain MCS the is corresponding spectrum efficiency corresponding with reporting CQI is the most approaching, then this MCS is designated as MCS Init
Step B2: the MCS that data are sent in final base station is:
MCS use＝max(min((MCS init+ΔMCS2)，MCS_Max)，MCS_Min)
Wherein the MCS maximum of MCS_Max presentation protocol regulation is 28 for the LTE system.The MCS minimum value of MCS_Min presentation protocol regulation is 0 for the LTE system.
Step B3: this frame of base station uses RI to equal 2 and sends data.
The ACK/NACK information of this frame of step B4:UE feedback is used to calculate BLER2 and obtains outer loop parameter Δ MCS2.
Flow process C:
If the former frame base station send the RI of data equal 1 and the RI that reports of UE the last time equal 2, then get into switching flow C.Flow process C is divided into following step:
Step C1:C_R1R2=C_R1R2+1;
Wherein, the initial value of C_R1R2 is 0.
Step C2: the spectrum efficiency that certain MCS the is corresponding spectrum efficiency corresponding with reporting CQI near the time, this MCS is designated as MCS Init_SM, then
MCS SM＝max(min((MCS init_SM+ΔMCS2)，MCS_Max)，MCS_Min)
MCS wherein SMThe MCS of correspondence during expression RI=2, the MCS maximum of MCS_Max presentation protocol regulation is 28 for the LTE system.The MCS minimum value of MCS_Min presentation protocol regulation is 0 for the LTE system.
Calculate MCS SMCorresponding spectrum efficiency also multiply by 2 (because RI=2), is designated as T_R2_tmp1.
Step C3: calculate the average of T_R2_tmp1 in the window, be designated as T_R2, adopt the mode of sliding window, window length is M (span 5-100).
If one of meet the following conditions execution in step C4, C5 and C6, otherwise execution in step C7, C8 and C9.
Condition 1: if C_R1R2 more than or equal to M and T_R2 greater than the corresponding spectrum efficiency T_SFBC of spendable maximum MCS (being the corresponding spectrum efficiency of diversity mode MCS=28).
Wherein, T_R2 is during greater than T_SFBC, explains that promptly spectrum efficiency that RI=2 estimates is higher than the peak efficiency of RI=1, therefore, can be directly switch to RI=2.
Condition 2: Δ MCS4 is less than 0.
Wherein, Δ MCS4 explains promptly that less than 0 the spectrum efficiency of RI=1 is lower than the spectrum efficiency that RI=2 estimates.
Step C4: this frame of base station uses RI to equal 2, uses MCS SMSend data.
Step C5: the initialization outer loop parameter, i.e. Δ MCS4=0, BLER4 adds up again, and corresponding with it ACK/NACK empties, C_R1R2=0, T_R2=0, and data in the window among the emptying step C3.
The ACK/NACK information of this frame of step C6:UE feedback is used to calculate obtaining of BLER2 and outer loop parameter Δ MCS2.
Step C7: this frame of base station uses RI to equal 1 and sends data.
Step C8: the T_R2_tmp1 according among the step C2 confirms MCS Init_SFBC, principle is that certain MCS corresponding spectrum efficiency and T_R2_tmp1 are the most approaching.And then according to the definite MCS that sends data of following formula.
MCS use＝max(min((MCS init_SFBC+ΔMCS4)，MCS_Max)，MCS_Min)
Wherein the MCS maximum of MCS_Max presentation protocol regulation is 28 for the LTE system.The MCS minimum value of MCS_Min presentation protocol regulation is 0 for the LTE system.
The ACK/NACK information of this frame of step C9:UE feedback is used to calculate obtaining of BLER4 and outer loop parameter Δ MCS4.
Flow process D:
If the former frame base station send the RI of data equal 2 and the RI that reports of UE the last time equal 1, then get into switching flow D.Flow process D is divided into following step:
Step D1: the value according to Δ MCS3 judges that further more than or equal to 0, then execution in step D2 is to D7 as if Δ MCS3, and less than 0, then execution in step D8 is to D11 as if Δ MCS3.
Step D2: this frame of base station uses RI to equal 2 and sends data.
Step D3: the spectrum efficiency that certain MCS the is corresponding spectrum efficiency corresponding with reporting CQI is the most approaching, then this MCS is designated as MCS Init_SFBCMCS SFBCObtain by following formula:
MCS SFBC＝max(min((MCS init_SFBC+ΔMCS1)，MCS_Max)，MCS_Min)
Wherein the MCS maximum of MCS_Max presentation protocol regulation is 28 for the LTE system.The MCS minimum value of MCS_Min presentation protocol regulation is 0 for the LTE system.
Step D4: calculate MCS SFBCCorresponding spectrum efficiency, and with it divided by 2, be designated as T SM
Step D5: spectrum efficiency and T that certain MCS is corresponding SMThe most approaching, then this MCS is designated as MCS Init_SM
Step D6: the MCS that data are sent in final base station is:
MCS use＝max(min((MCS init_SM+ΔMCS3)，MCS_Max)，MCS_Min)
Wherein the MCS maximum of MCS_Max presentation protocol regulation is 28 for the LTE system.The MCS minimum value of MCS_Min presentation protocol regulation is 0 for the LTE system.
The ACK/NACK information of this frame of step D7:UE feedback is used to calculate obtaining of BLER3 and outer loop parameter Δ MCS3.
Step D8: this frame of base station uses RI to equal 1 and sends data.
Step D9: the initialization outer loop parameter, i.e. Δ MCS3=0, BLER3 adds up again, and corresponding with it ACK/NACK empties.
Step D10: the spectrum efficiency that certain MCS the is corresponding spectrum efficiency corresponding with reporting CQI is the most approaching, then this MCS is designated as MCS InitThe MCS that data are sent in final base station is:
MCS use＝max(min((MCS init+ΔMCS1)，MCS_Max)，MCS_Min)
Wherein the MCS maximum of MCS_Max presentation protocol regulation is 28 for the LTE system.The MCS minimum value of MCS_Min presentation protocol regulation is 0 for the LTE system.
The ACK/NACK information of this frame of step D11:UE feedback is used to calculate obtaining of BLER1 and outer loop parameter Δ MCS1.
To combine accompanying drawing and specific embodiment that the enforcement of technical scheme of the present invention is described in further detail below.
Fig. 1 is the schematic flow sheet of the interior adaptive method for switching of LTE downlink transfer mode 3 of the embodiment of the invention, and in conjunction with Fig. 1, the adaptive method for switching of present embodiment specifically describes as follows:
Step 101, parameter initialization comprises T_R2_tmp1 value, C_R1R2 and T_R2 in outer shroud adjustment parameter, BLER, the window;
Step 102, frame uses RI whether to equal the RI that UE the last time this moment reports in the judgement, if then execution in step 103; Otherwise, execution in step 104;
Step 103, the RI that uses UE the last time to report sends data;
Step 104 judges whether the RI=2 that former frame base station use RI=1 and UE the last time report, if then execution in step 105, otherwise, execution in step 108;
Step 105 judges that whether non-corresponding DeltaMCS negative, and the spectrum efficiency of RI=2 is no more than the maximum spectral efficiency of RI=1, if then execution in step 106, otherwise, execution in step 107;
Step 106, switching is not carried out in decision, and this frame of base station continues to use RI=1 to send data;
Step 107, decision are carried out and are switched, and this frame of base station adopts RI=2 to send data;
Step 108 promptly explains that RI=2 is used in the former frame base station this moment and RI=1 that UE the last time reports, judges then whether corresponding DeltaMCS is non-negative, if then execution in step 109, otherwise, execution in step 110;
Step 109, switching is not carried out in decision, and this frame of base station continues to use RI=2 to send data;
Step 110, decision are carried out and are switched, and this frame of base station adopts RI=1 to send data.
In addition, a kind of self adaptation switched system (not shown) is provided also in the embodiment of the invention, has been applied to LTE downlink transfer mode 3, the self adaptation switched system of present embodiment comprises order designator comparing unit and the handover decisions unit in the base station, wherein:
Said order designator comparing unit, whether being used for RI that comparison terminal the last time reports and former frame base station, to send the RI that data use consistent, as if inconsistent, then with inconsistent result notification handover decisions unit;
Said handover decisions unit; After being used to receive said inconsistent result; Estimate the spectrum efficiency of the send mode of the RI correspondence that said terminal the last time reports; If this spectrum efficiency that estimates is higher than the spectrum efficiency of the send mode of the RI correspondence of using the former frame base station, the RI that then determines this frame of base station to adopt said terminal the last time to report sends data.
Further, said order designator comparing unit also is used for, if it is consistent to judge the RI that RI that said terminal the last time reports and former frame base station sends the data use, then with the said handover decisions of the result notification of unanimity unit;
Said handover decisions unit also is used for, and according to the result of said unanimity, the RI that this frame of decision base station still adopts former frame to use sends data.
Further; Said handover decisions unit also is used for; After receiving said inconsistent result, if the said spectrum efficiency that estimates is equal to or less than the spectrum efficiency of the send mode of the RI correspondence of using the former frame base station, the RI that then determines this frame of base station still to adopt former frame to use sends data.
Further, said system also comprises outer shroud adjustment parameter acquiring unit,
Said outer shroud adjustment parameter acquiring unit is used for, and the different value condition of the RI that data use are sent in the RI that reports according to said terminal the last time and former frame base station, respectively statistics of error rate BLER and obtain the value that outer shroud is adjusted parameter Δ MCS;
Said handover decisions unit is further used for, when the value of outer shroud adjustment parameter Δ MCS less than 0 the time, judge that then the said spectrum efficiency that estimates is higher than the spectrum efficiency of the corresponding send mode of the RI that uses the former frame base station.
Further; Said handover decisions unit also is used for; The RI that statistics reported when said terminal the last time equals 2 and the number of times that RI that data use equals 1 is sent in the former frame base station; The spectrum efficiency that surpasses the corresponding send mode of RI that predetermined threshold and said terminal the last time report when the number of times of statistics is during greater than the corresponding spectrum efficiency of the spendable maximum MCS of diversity mode, and the RI that then determines this frame of base station to adopt said terminal the last time to report sends data.
Below will combine applying examples that adaptive method for switching of the present invention is done to introduce more specifically.
Applying examples one
If a certain moment Δ MCS1=-1, Δ MCS2=-2, Δ MCS3=0, Δ MCS4=0, C_R1R2=0, sliding window length M is 5, does not have numerical value in the window; The base station previous frame sends the RI=1 that data are used to UE, and the RI=1 that this frame UE the last time reports, the CQI=5 that the last time reports.
Report situation according to the operating position of previous frame RI and the last time of RI, get into handoff algorithms flow process A, flow process A is divided into following 4 steps:
Steps A 1: at first, finding the corresponding spectrum efficiency of CQI=5 according to CQI with the corresponding relation of spectrum efficiency is 0.8770;
Wherein, according to LTE agreement regulation, the corresponding relation of CQI and spectrum efficiency is as shown in table 1 below:
The corresponding relation of table 1CQI and spectrum efficiency
Figure BSA00000230085500121
According to the immediate principle of spectrum efficiency, confirm MCS again InitBe 7;
Wherein, the spectrum efficiency that each MCS (0-28) is corresponding is { 0.1970,0.2424,0.3106,0.4167,0.5227,0.6439,0.7652; 0.9167,1.0379,1.1894,1.1894,1.3106,1.5227,1.7045,1.9167; 2.1591,2.3409,2.3409,2.4621,2.7045,2.9470,3.3106; 3.5530,3.7955,4.0379,4.3409,4.7045,4.8864,5.6742}.
Steps A 2: the MCS that data are sent in final base station is:
MCS use＝max(min((7+(-1))，28)，0)＝6
Steps A 3: this frame of base station uses RI to equal 1 and sends data.
The ACK/NACK of this frame of steps A 4:UE feedback is used to calculate BLER1 and outer loop parameter Δ MCS1.
Applying examples two
If a certain moment Δ MCS1=0, Δ MCS2=-2, Δ MCS3=0, Δ MCS4=-1, C_R1R2=20, sliding window length M is 5,5 values in the window be respectively 2.4621,2.4621,2.9470,3.3106,3.5530}.The base station previous frame sends the RI=1 that data are used to UE, and the RI=2 that UE the last time reports, the CQI=3 that reports.
Report situation according to the operating position of previous frame RI and the last time of RI, get into handoff algorithms flow process C, flow process C is divided into following a few step:
Step C1:C_R1R2=C_R1R2+1=21;
The spectrum efficiency that step C2:CQI=3 is corresponding is 0.3770, according to the immediate principle MCS of spectrum efficiency Init_SMBe 3, further try to achieve
MCS SM＝max(min((3+(-2))，28)，0)＝1
The spectrum efficiency that MCS1 is corresponding is 0.2424, and taking advantage of the result after 2 is 0.4848, that is: T_R2_tmp1 is 0.4848
Step C3: adopt the mode of sliding window to calculate T_R2.
T_R2 equals that { 2.4621,2.9470,3.3106,3.5530, the average of 0.4848} is 2.5515.
The contrast condition satisfies condition 2, so continue to carry out C4, C5 and C6.
Step C4: this frame of base station uses RI to equal 2, uses MCS SM=1 sends data.
Step C5: the initialization outer loop parameter, i.e. Δ MCS4=0, BLER4 adds up again, and corresponding with it ACK/NACK empties, C_R1R2=0, T_R2=0, and data in the window among the emptying step C3.
The ACK/NACK information of this frame of step C6:UE feedback is used to calculate BLER2 and obtains outer loop parameter Δ MCS2.
More than be merely preferred case study on implementation of the present invention; Be not limited to the present invention; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof, those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to accomplish through program, said program can be stored in the computer-readable recording medium, like read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.

Claims (10)

1. an adaptive method for switching is characterized in that, said method comprises:
RI that data use is sent when inconsistent in the order designator (RI) that reports when terminal the last time and former frame base station; Estimate the spectrum efficiency of the send mode of the RI correspondence that said terminal the last time reports; If this spectrum efficiency that estimates is higher than the spectrum efficiency of the corresponding send mode of the RI that uses the former frame base station, then this frame of base station RI of adopting said terminal the last time to report sends data.
2. the method for claim 1 is characterized in that,
It is consistent that the RI that data use is sent in the RI that reports when said terminal the last time and former frame base station; Perhaps; The RI that RI that said terminal the last time reports and former frame base station transmission data are used is inconsistent; But when this spectrum efficiency that estimates was equal to or less than the spectrum efficiency of the corresponding send mode of the RI of former frame base station use, the RI that this frame of base station still adopts former frame to use sent data.
3. the method for claim 1 is characterized in that,
When the value of outer shroud adjustment parameter Δ MCS less than 0 the time, judge that then the said spectrum efficiency that estimates is higher than the spectrum efficiency of the corresponding send mode of the RI that uses the former frame base station.
4. method as claimed in claim 3 is characterized in that, the different value condition of the RI that data use are sent in RI that reports according to said terminal the last time and former frame base station, respectively statistics of error rate BLER and obtain the value of said Δ MCS.
5. like claim 3 or 4 described methods, it is characterized in that,
The RI that statistics reported when said terminal the last time equals 2 and the number of times that RI that data use equals 1 is sent in the former frame base station; The spectrum efficiency that surpasses the corresponding send mode of RI that predetermined threshold and said terminal the last time report when the number of times of statistics is during greater than the corresponding spectrum efficiency of the spendable maximum MCS of diversity mode, and then this frame of base station RI of adopting said terminal the last time to report sends data.
6. a self adaptation switched system is characterized in that, is applied to long evolving system (LTE) downlink transfer mode 3, and said system comprises order designator comparing unit and the handover decisions unit in the base station, wherein:
Said order designator comparing unit, whether being used for RI that comparison terminal the last time reports and former frame base station, to send the RI that data use consistent, as if inconsistent, then with inconsistent result notification handover decisions unit;
Said handover decisions unit; After being used to receive said inconsistent result; Estimate the spectrum efficiency of the send mode of the RI correspondence that said terminal the last time reports; If this spectrum efficiency that estimates is higher than the spectrum efficiency of the send mode of the RI correspondence of using the former frame base station, the RI that then determines this frame of base station to adopt said terminal the last time to report sends data.
7. system as claimed in claim 6 is characterized in that,
Said order designator comparing unit also is used for, if it is consistent to judge the RI that RI that said terminal the last time reports and former frame base station sends the data use, then with the said handover decisions of the result notification of unanimity unit;
Said handover decisions unit also is used for, and according to the result of said unanimity, the RI that this frame of decision base station still adopts former frame to use sends data.
8. system as claimed in claim 6 is characterized in that,
Said handover decisions unit also is used for; After receiving said inconsistent result; If the said spectrum efficiency that estimates is equal to or less than the spectrum efficiency of the send mode of the RI correspondence of using the former frame base station, the RI that then determines this frame of base station still to adopt former frame to use sends data.
9. like claim 6,7 or 8 described systems, it is characterized in that said system also comprises outer shroud adjustment parameter acquiring unit,
Said outer shroud adjustment parameter acquiring unit is used for, and the different value condition of the RI that data use are sent in the RI that reports according to said terminal the last time and former frame base station, respectively statistics of error rate BLER and obtain the value that outer shroud is adjusted parameter Δ MCS;
Said handover decisions unit is further used for, when the value of outer shroud adjustment parameter Δ MCS less than 0 the time, judge that then the said spectrum efficiency that estimates is higher than the spectrum efficiency of the corresponding send mode of the RI that uses the former frame base station.
10. system as claimed in claim 9 is characterized in that,
Said handover decisions unit also is used for; The RI that statistics reported when said terminal the last time equals 2 and the number of times that RI that data use equals 1 is sent in the former frame base station; The spectrum efficiency that surpasses the corresponding send mode of RI that predetermined threshold and said terminal the last time report when the number of times of statistics is during greater than the corresponding spectrum efficiency of the spendable maximum MCS of diversity mode, and the RI that then determines this frame of base station to adopt said terminal the last time to report sends data.
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