CN102377538B - Self-adaptive switching method and system - Google Patents

Self-adaptive switching method and system Download PDF

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CN102377538B
CN102377538B CN201010252713.9A CN201010252713A CN102377538B CN 102377538 B CN102377538 B CN 102377538B CN 201010252713 A CN201010252713 A CN 201010252713A CN 102377538 B CN102377538 B CN 102377538B
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base station
spectrum efficiency
last time
mcs
former frame
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CN102377538A (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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    • 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, 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 effectively improve capacity and the link transmission performance of wireless network.
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 to two kinds of send modes, select according to actual channel situation.
A kind of handoff algorithms of transmission mode 3 is provided in prior art, and the basic principle of this algorithm is: when occurring that continuously RI that the value of reporting and the current base station of the RI of several times UE (User Equipment, subscriber equipment) used is different, switch.For example: the RI=1 that current base station is used, UE reports RI=2 continuously 3 times, 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 RI sequence, and does not consider the impact that spectrum efficiency (the original bit number transmitting on the spectrum efficiency unit of being defined as subcarrier herein) is switched MIMO pattern.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of adaptive method for switching and system, can select the MIMO transmission means that spectrum efficiency is higher, effectively improves throughput of system.
For solving the problems of the technologies described above, the invention provides a kind of adaptive method for switching, described method comprises:
The order designator (RI) reporting when terminal the last time and former frame base station send RI that data are used when inconsistent, estimate the spectrum efficiency of the send mode that RI that described terminal the last time reports is corresponding, if the spectrum efficiency of the send mode that the RI that this spectrum efficiency estimating is used higher than former frame base station is corresponding, this frame of base station adopts the RI that described terminal the last time reports to send data.
Further, the RI that the RI reporting when described terminal the last time is used with former frame base station transmission data is consistent; Or, the RI that the RI that described terminal the last time reports and former frame base station transmission data are used is inconsistent, but when this spectrum efficiency estimating is equal to or less than the spectrum efficiency of the send mode that the RI of former frame base station use is corresponding, this frame of base station still adopts the RI that former frame is used to send data.
Further, when the value of outer shroud adjustment parameter is less than 0, the spectrum efficiency estimating described in judging is higher than the spectrum efficiency of send mode corresponding to the RI of former frame base station use.
Further, the RI reporting according to described terminal the last time and former frame base station send the different value condition of the RI that data are used, respectively statistics of error rate BLER obtain described value.
Further, the RI that statistics reported when described terminal the last time equals 2 and former frame base station sends the number of times that RI that data are used equals 1, when the spectrum efficiency that surpasses the send mode that RI that predetermined threshold and described terminal the last time report is corresponding when the number of times of statistics is greater than spectrum efficiency corresponding to the spendable maximum MCS of diversity mode, this frame of base station adopts the RI that described terminal the last time reports to send 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 described system comprises order designator comparing unit and the handover decisions unit in base station, wherein:
Described order designator comparing unit, whether consistent with the RI that former frame base station sends data use for the RI that comparison terminal the last time reports, if inconsistent, by inconsistent result notice handover decisions unit;
Described handover decisions unit, be used for receiving after described inconsistent result, estimate the spectrum efficiency of the send mode that RI that described terminal the last time reports is corresponding, if the spectrum efficiency of the send mode that the RI that this spectrum efficiency estimating is used higher than former frame base station is corresponding, determines that this frame of base station adopts the RI that described terminal the last time reports to send data.
Further, it is consistent that described order designator comparing unit also sends for, the RI that described terminal the last time reports if judge and former frame base station the RI that data are used, and consistent result notified to described handover decisions unit;
Described handover decisions unit also for, according to described consistent result, determine that this frame of base station still adopts the RI that former frame is used to send data.
Further, described handover decisions unit also for, receive after described inconsistent result, if described in the spectrum efficiency that estimates be equal to or less than the spectrum efficiency of the send mode that the RI that uses former frame base station is corresponding, determine that this frame of base station still adopts the RI that former frame is used to send data.
Further, described system also comprises outer shroud adjustment parameter acquiring unit,
Described outer shroud is adjusted parameter acquiring unit and is used for, and the RI reporting according to described terminal the last time and former frame base station send the different value condition of the RI that data are used, respectively statistics of error rate BLER obtain the value that outer shroud is adjusted parameter;
Described handover decisions unit is further used for, and when the value of outer shroud adjustment parameter is less than 0, the spectrum efficiency estimating described in judging is higher than the spectrum efficiency of send mode corresponding to the RI of former frame base station use.
Further, described handover decisions unit also for, the RI that statistics reported when described terminal the last time equals 2 and former frame base station sends the number of times that RI that data are used equals 1, when the spectrum efficiency that surpasses the send mode that RI that predetermined threshold and described terminal the last time report is corresponding when the number of times of statistics is greater than spectrum efficiency corresponding to the spendable maximum MCS of diversity mode, determine that this frame of base station adopts the RI that described terminal the last time reports to send data.
The situation of the RI that the present invention sends data RI according to previous frame base station and UE the last time report, if both RI are inconsistent, estimates respectively and compare two kinds of spectrum efficiencies that send mode is corresponding, and whether decision carry out switching according to comparative result; In addition, when estimating corresponding spectrum efficiency, in conjunction with outer shroud, adjust parameter, select the higher send mode of spectrum efficiency, effectively improved throughput of system.
Accompanying drawing explanation
Fig. 1 is the method flow schematic diagram that the interior self adaptation of the LTE downlink transfer mode 3 of the embodiment of the present 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: when previous frame base station sends RI that the RI of data and UE the last time report when inconsistent, estimate respectively the spectrum efficiency of transmit diversity and two kinds of send modes of spatial reuse, and select the MIMO send mode that spectrum efficiency is higher, thereby can effectively improve throughput of system.
Particularly, the present invention is in conjunction with existing AMC (Adaptive Modulation and Coding, Adaptive Modulation and Coding technology) outer shroud is adjusted parameter DeltaMCS (also claiming Δ MCS), estimates the spectrum efficiency of transmit diversity and two kinds of send modes of spatial reuse.
The basic principle that the existing AMC of obtaining outer shroud is adjusted 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 determining Δ MCS.
Wherein, the initial value of Δ MCS is 0, Δ MCS maximum (span 1-10), minimum value (span-20 are to-1), BLER higher limit (span 15% to 50%), BLER lower limit (span 0% to 8%).
Second step: if the sampled value of BLER (sampling period 10 to 100 subframes) N continuous (span 1-10) is inferior to lower limit, Δ MCS adds 1, but is no more than Δ MCS maximum; If the continuous K of the sampled value of BLER (span 1-10) is inferior to higher limit, Δ MCS subtracts 1, but is not less than Δ MCS minimum value; Other situations Δ MCS remain unchanged.
In the present invention, according to previous frame base station, send the situation of the RI that the RI of data and UE the last time report, adopt respectively four AMC outer shrouds to adjust parameter and carry out the switching of MIMO sending mode, be designated as respectively Δ MCS1, Δ MCS2, Δ MCS3 and Δ MCS4, and provide corresponding outer loop parameter to obtain flow process.And the algorithm principle between each flow process is consistent, 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 calculate by corresponding with it ACK (Acknowledgement confirms)/NACK (Negative Acknowledgement, does not confirm).
Based on above-mentioned thinking, the invention provides a kind of adaptive method for switching, specifically adopt following technical scheme:
The RI reporting when terminal the last time and former frame base station send RI that data are used when inconsistent, estimate the spectrum efficiency of the send mode that RI that described terminal the last time reports is corresponding, if the spectrum efficiency of the send mode that the RI that this spectrum efficiency estimating is used higher than former frame base station is corresponding, this frame of base station adopts the RI that described terminal the last time reports to send data.
Further, the RI that the RI reporting when terminal the last time is used with former frame base station transmission data is consistent;
Or, the RI that the RI that terminal the last time reports and former frame base station transmission data are used is inconsistent, but when this spectrum efficiency estimating is equal to or less than the spectrum efficiency of the send mode that the RI of former frame base station use is corresponding, this frame of base station still adopts the RI that former frame is used to send data.
Wherein, it should be noted that, terminal is not that every frame all reports RI, and for example: UE reports RI=1 at t frame, UE reports RI=2 at t+4 frame, so, thinks herein and to the RI of t+3 frame terminal to report, is 1 at t+1 frame, be i.e. the RI that reports of UE the last time.
Further, when the value of outer shroud adjustment parameter Δ MCS is less than 0, the spectrum efficiency estimating described in judging is higher than the spectrum efficiency of send mode corresponding to the RI of former frame base station use.
Further, the RI reporting according to described terminal the last time and former frame base station send the different value condition of the RI that data are used, respectively statistics of error rate BLER obtain the value of described Δ MCS.
Further, the RI that statistics reported when described terminal the last time equals 2, the number of times that the RI that former frame base station transmission data are used equals 1, when the spectrum efficiency that surpasses the send mode that RI that predetermined threshold and described terminal the last time report is corresponding when the number of times of statistics is greater than spectrum efficiency corresponding to the spendable maximum MCS of diversity mode, this frame of base station adopts the RI that described terminal the last time reports to send data.
Particularly, according to former frame base station, send the value condition that the RI of data and UE the last time report RI, following four flow processs (be scheduled for the first time for UE, think that RI that former frame base station sends data and UE the last time report the value of RI identical) are provided respectively.
Flow process A:
If former frame base station send the RI of data equal 1 and the RI that reports of UE the last time equal 1, enter switching flow A.Flow process A is divided into following step:
Steps A 1: spectrum efficiency corresponding to certain MCS spectrum efficiency corresponding with reporting CQI (Channel Quality Indicator, CQI) is the most approaching, this MCS is designated as to MCS init.
Steps A 2: the MCS that final base station sends data 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 LTE system.The MCS minimum value of MCS_Min presentation protocol regulation is 0 for LTE system.
Steps A 3: this frame of base station is used RI to equal 1 transmission data.
The ACK/NACK that steps A 4:UE feeds back this frame is for adding up and calculate BLER1 that should flow process and obtaining outer loop parameter Δ MCS1.
Flow process B:
If former frame base station send the RI of data equal 2 and the RI that reports of UE the last time equal 2, enter switching flow B.Flow process B is divided into following step:
Step B1: spectrum efficiency that certain MCS the is corresponding spectrum efficiency corresponding with reporting CQI is the most approaching, this MCS is designated as to MCS init.
Step B2: the MCS that final base station sends data 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 LTE system.The MCS minimum value of MCS_Min presentation protocol regulation is 0 for LTE system.
Step B3: this frame of base station is used RI to equal 2 transmission data.
Step B4:UE feeds back the ACK/NACK information of this frame for calculating BLER2 and obtaining outer loop parameter Δ MCS2.
Flow process C:
If former frame base station send the RI of data equal 1 and the RI that reports of UE the last time equal 2, enter 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: when the spectrum efficiency spectrum efficiency corresponding with reporting CQI that certain MCS is corresponding approaches most, this MCS is designated as to MCS init_SM,
MCS SM＝max(min((MCS init_SM+ΔMCS2)，MCS_Max)，MCS_Min)
MCS wherein sMcorresponding MCS while representing RI=2, the MCS maximum of MCS_Max presentation protocol regulation, is 28 for LTE system.The MCS minimum value of MCS_Min presentation protocol regulation is 0 for LTE system.
Calculate MCS sMcorresponding spectrum efficiency is also multiplied by 2 (because RI=2), is designated as T_R2_tmp1.
Step C3: calculate the average of T_R2_tmp1 in window, be designated as T_R2, adopt the mode of sliding window, window is long is M (span 5-100).
If one of meet the following conditions, execution step C4, C5 and C6, otherwise execution step C7, C8 and C9.
Condition 1: if C_R1R2 is more than or equal to M and T_R2 is greater than the spectrum efficiency T_SFBC that spendable maximum MCS is corresponding (being the spectrum efficiency that diversity mode MCS=28 is corresponding).
Wherein, when T_R2 is greater than T_SFBC, illustrate that spectrum efficiency that RI=2 estimates, 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 is less than 0, and the spectrum efficiency that the spectrum efficiency of RI=1 estimates lower than RI=2 is described.
Step C4: this frame of base station is used RI to equal 2, uses MCS sMsend data.
Step C5: initialization outer loop parameter, i.e. Δ MCS4=0, BLER4 adds up again, and corresponding ACK/NACK empties with it, C_R1R2=0, T_R2=0, and data in the window in emptying step C3.
Step C6:UE feeds back the ACK/NACK information of this frame for calculating obtaining of BLER2 and outer loop parameter Δ MCS2.
Step C7: this frame of base station is used RI to equal 1 transmission data.
Step C8: determine MCS according to the T_R2_tmp1 in step C2 init_SFBC, principle is that spectrum efficiency and T_R2_tmp1 that certain MCS is corresponding 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 LTE system.The MCS minimum value of MCS_Min presentation protocol regulation is 0 for LTE system.
Step C9:UE feeds back the ACK/NACK information of this frame for calculating obtaining of BLER4 and outer loop parameter Δ MCS4.
Flow process D:
If former frame base station send the RI of data equal 2 and the RI that reports of UE the last time equal 1, enter switching flow D.Flow process D is divided into following step:
Step D1: further judge according to the value of Δ MCS3, if Δ MCS3 is more than or equal to 0, perform step D2 to D7, if Δ MCS3 is less than 0, perform step D8 to D11.
Step D2: this frame of base station is used RI to equal 2 transmission data.
Step D3: spectrum efficiency that certain MCS the is corresponding spectrum efficiency corresponding with reporting CQI is the most approaching, this MCS is designated as to MCS init_SFBC.MCS sFBCby following formula, obtained:
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 LTE system.The MCS minimum value of MCS_Min presentation protocol regulation is 0 for LTE system.
Step D4: calculate MCS sFBCcorresponding spectrum efficiency, and by it divided by 2, be designated as T sM.
Step D5: the spectrum efficiency that certain MCS is corresponding and T sMthe most approaching, this MCS is designated as to MCS init_SM.
Step D6: the MCS that final base station sends data 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 LTE system.The MCS minimum value of MCS_Min presentation protocol regulation is 0 for LTE system.
Step D7:UE feeds back the ACK/NACK information of this frame for calculating obtaining of BLER3 and outer loop parameter Δ MCS3.
Step D8: this frame of base station is used RI to equal 1 transmission data.
Step D9: initialization outer loop parameter, i.e. Δ MCS3=0, BLER3 adds up again, and corresponding ACK/NACK empties with it.
Step D10: spectrum efficiency that certain MCS the is corresponding spectrum efficiency corresponding with reporting CQI is the most approaching, this MCS is designated as to MCS init.The MCS that final base station sends data 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 LTE system.The MCS minimum value of MCS_Min presentation protocol regulation is 0 for LTE system.
Step D11:UE feeds back the ACK/NACK information of this frame for calculating obtaining of BLER1 and outer loop parameter Δ MCS1.
Below in conjunction with the accompanying drawings and the specific embodiments the enforcement of technical solution of the present invention is described in further detail.
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 present invention, and in conjunction with Fig. 1, the adaptive method for switching of the 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, window;
Step 102, in judgement, frame is used RI whether to equal the RI that UE the last time now reports, and if so, performs step 103; Otherwise, execution step 104;
Step 103, is used the RI that UE the last time reports to send data;
Step 104, judges whether the RI=2 that former frame base station use RI=1 and UE the last time report, and if so, performs step 105, otherwise, execution step 108;
Step 105, judges that whether non-corresponding DeltaMCS is negative, and the spectrum efficiency of RI=2 is no more than the maximum spectral efficiency of RI=1, if so, performs step 106, otherwise, execution step 107;
Step 106, determines not carry out switching, and this frame of base station continues to use RI=1 to send data;
Step 107, determines to carry out and switches, and this frame of base station adopts RI=2 to send data;
Step 108, now illustrate that RI=2 is used in former frame base station and RI=1 that UE the last time reports, judges that whether non-corresponding DeltaMCS is negative, if so, performs step 109, otherwise, execution step 110;
Step 109, determines not carry out switching, and this frame of base station continues to use RI=2 to send data;
Step 110, determines to carry out and switches, and this frame of base station adopts RI=1 to send data.
In addition, also provide a kind of self adaptation switched system (not shown) in the embodiment of the present invention, be applied to LTE downlink transfer mode 3, the self adaptation switched system of the present embodiment comprises order designator comparing unit and the handover decisions unit in base station, wherein:
Described order designator comparing unit, whether consistent with the RI that former frame base station sends data use for the RI that comparison terminal the last time reports, if inconsistent, by inconsistent result notice handover decisions unit;
Described handover decisions unit, be used for receiving after described inconsistent result, estimate the spectrum efficiency of the send mode that RI that described terminal the last time reports is corresponding, if the spectrum efficiency of the send mode that the RI that this spectrum efficiency estimating is used higher than former frame base station is corresponding, determines that this frame of base station adopts the RI that described terminal the last time reports to send data.
Further, it is consistent that described order designator comparing unit also sends for, the RI that described terminal the last time reports if judge and former frame base station the RI that data are used, and consistent result notified to described handover decisions unit;
Described handover decisions unit also for, according to described consistent result, determine that this frame of base station still adopts the RI that former frame is used to send data.
Further, described handover decisions unit also for, receive after described inconsistent result, if described in the spectrum efficiency that estimates be equal to or less than the spectrum efficiency of the send mode that the RI that uses former frame base station is corresponding, determine that this frame of base station still adopts the RI that former frame is used to send data.
Further, described system also comprises outer shroud adjustment parameter acquiring unit,
Described outer shroud is adjusted parameter acquiring unit and is used for, and the RI reporting according to described terminal the last time and former frame base station send the different value condition of the RI that data are used, respectively statistics of error rate BLER obtain the value that outer shroud is adjusted parameter Δ MCS;
Described handover decisions unit is further used for, and when the value of outer shroud adjustment parameter Δ MCS is less than 0, the spectrum efficiency estimating described in judging is higher than the spectrum efficiency of send mode corresponding to the RI of former frame base station use.
Further, described handover decisions unit also for, the RI that statistics reported when described terminal the last time equals 2 and former frame base station sends the number of times that RI that data are used equals 1, when the spectrum efficiency that surpasses the send mode that RI that predetermined threshold and described terminal the last time report is corresponding when the number of times of statistics is greater than spectrum efficiency corresponding to the spendable maximum MCS of diversity mode, determine that this frame of base station adopts the RI that described terminal the last time reports to send data.
Below with reference to application example, adaptive method for switching of the present invention is done to introduce more specifically.
Application example 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, there is no numerical value in window; Base station previous frame sends to UE the RI=1 that data are used, 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 last time of the service condition of previous frame RI and RI, enter handoff algorithms flow process A, flow process A is divided into following 4 steps:
Steps A 1: first, finding with the corresponding relation of spectrum efficiency the spectrum efficiency that CQI=5 is corresponding according to CQI 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, determine 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 final base station sends data is:
MCS use＝max(min((7+(-1))，28)，0)＝6
Steps A 3: this frame of base station is used RI to equal 1 transmission data.
Steps A 4:UE feeds back the ACK/NACK of this frame for calculating BLER1 and outer loop parameter Δ MCS1.
Application example 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 window are respectively { 2.4621,2.4621,2.9470,3.3106,3.5530}.Base station previous frame sends to UE the RI=1 that data are used, and the RI=2 that UE the last time reports, the CQI=3 reporting.
Report situation according to the last time of the service condition of previous frame RI and RI, enter handoff algorithms flow process C, flow process C is divided into the following steps:
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 { average of 2.4621,2.9470,3.3106,3.5530,0.4848} is 2.5515.
Contrast condition, satisfies condition 2, therefore continue to carry out C4, C5 and C6.
Step C4: this frame of base station is used RI to equal 2, uses MCS sM=1 sends data.
Step C5: initialization outer loop parameter, i.e. Δ MCS4=0, BLER4 adds up again, and corresponding ACK/NACK empties with it, C_R1R2=0, T_R2=0, and data in the window in emptying step C3.
Step C6:UE feeds back the ACK/NACK information of this frame for calculating BLER2 and obtaining outer loop parameter Δ MCS2.
These are only 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; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art can make according to the present invention various corresponding changes and distortion, 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 said method can come instruction related hardware to complete by program, described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits.Correspondingly, each the module/unit in above-described embodiment can adopt the form of hardware to realize, and 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 (6)

1. an adaptive method for switching, is characterized in that, described method comprises:
The order designator RI reporting when terminal the last time and former frame base station send RI that data are used when inconsistent, estimate the spectrum efficiency of the send mode that RI that described terminal the last time reports is corresponding, if the spectrum efficiency of the send mode that the RI that this spectrum efficiency estimating is used higher than former frame base station is corresponding, this frame of base station adopts the RI that described terminal the last time reports to send data;
When the value of outer shroud adjustment parameter Δ MCS is less than 0, the spectrum efficiency estimating described in judging is higher than the spectrum efficiency of send mode corresponding to the RI of former frame base station use;
The RI that statistics reported when described terminal the last time equals 2 and former frame base station sends the number of times that RI that data are used equals 1, when the spectrum efficiency that surpasses the send mode that RI that predetermined threshold and described terminal the last time report is corresponding when the number of times of statistics is greater than spectrum efficiency corresponding to the spendable maximum MCS of diversity mode, this frame of base station adopts the RI that described terminal the last time reports to send data.
2. the method for claim 1, is characterized in that,
The RI that the RI reporting when described terminal the last time is used with former frame base station transmission data is consistent; Or, the RI that the RI that described terminal the last time reports and former frame base station transmission data are used is inconsistent, but when this spectrum efficiency estimating is equal to or less than the spectrum efficiency of the send mode that the RI of former frame base station use is corresponding, this frame of base station still adopts the RI that former frame is used to send data.
3. the method for claim 1, is characterized in that, the RI reporting according to described terminal the last time and former frame base station send the different value condition of the RI that data are used, respectively statistics of error rate BLER obtain the value of described Δ MCS.
4. a self adaptation switched system, is characterized in that, is applied to long evolving system LTE downlink transfer mode 3, and described system comprises order designator comparing unit and the handover decisions unit in base station, also comprises outer shroud adjustment parameter acquiring unit, wherein:
Described order designator comparing unit, whether consistent with the RI that former frame base station sends data use for the order designator RI that comparison terminal the last time reports, if inconsistent, by inconsistent result notice handover decisions unit;
Described outer shroud is adjusted parameter acquiring unit, sends the different value condition of the RI that data are used for the RI that reports according to described terminal the last time and former frame base station, respectively statistics of error rate BLER obtain the value that outer shroud is adjusted parameter Δ MCS;
Described handover decisions unit, be used for receiving after described inconsistent result, estimate the spectrum efficiency of the send mode that RI that described terminal the last time reports is corresponding, if the spectrum efficiency of the send mode that the RI that this spectrum efficiency estimating is used higher than former frame base station is corresponding, determines that this frame of base station adopts the RI that described terminal the last time reports to send data; While being also less than 0 for the value as outer shroud adjustment parameter Δ MCS, the spectrum efficiency that judgement estimates is higher than the spectrum efficiency of send mode corresponding to the RI of former frame base station use; Be further used for, the RI that statistics reported when described terminal the last time equals 2 and former frame base station sends the number of times that RI that data are used equals 1, when the spectrum efficiency that surpasses the send mode that RI that predetermined threshold and described terminal the last time report is corresponding when the number of times of statistics is greater than spectrum efficiency corresponding to the spendable maximum MCS of diversity mode, determine that this frame of base station adopts the RI that described terminal the last time reports to send data.
5. system as claimed in claim 4, is characterized in that,
It is consistent that described order designator comparing unit also sends for, the RI that described terminal the last time reports if judge and former frame base station the RI that data are used, and consistent result notified to described handover decisions unit;
Described handover decisions unit also for, according to described consistent result, determine that this frame of base station still adopts the RI that former frame is used to send data.
6. system as claimed in claim 4, is characterized in that,
Described handover decisions unit also for, receive after described inconsistent result, if described in the spectrum efficiency that estimates be equal to or less than the spectrum efficiency of the send mode that the RI that uses former frame base station is corresponding, determine that this frame of base station still adopts the RI that former frame is used to send data.
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