CN102843210B - Self-adaptive rank selection method - Google Patents
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Abstract
The invention provides a self-adaptive rank selection method. The self-adaptive rank selection method comprises the following steps of: A) acquiring the instantaneous rank information of a current frame; B) judging whether the instantaneous rank information of the current frame is the same with the actual rank information of the current frame or not, if so, keeping the count value of a rank change accumulator unchanged, otherwise, adding 1 to the count value of the rank change accumulator; C) judging whether the instantaneous rank information within a feedback period is accumulated or not, if so, implementing the step D), otherwise, returning to the step A); and D) calculating the ratio of the count value of the rank change accumulator to the number of frames in the feedback period, judging whether the ratio is larger than a first threshold value which is preset or not, if so, updating the rank information in the next transmission period, otherwise, keeping the rank information in the next transmission period unchanged. According to the scheme provided by the invention, an appropriate rank can be selected precisely.
Description
Technical field
The present invention relates to wireless communication system, particularly relate to the system of selection of a kind of self adaptation order.
Background technology
Order, is generally used for the data fluxion of descriptive system transmission in a communications system.In LTE system, current R9 release protocol supports 8 kinds of transmission modes, and namely transmission mode 1 (TM1, Transmission Mode1) is to transmission mode 8 (TM8).Wherein, TM5 belongs to multi-user, puts aside; TM1, TM2, TM6, TM7 only support single current transfer of data, and TM3, TM4, TM8 had both supported single current transfer of data, supported double-flow data transmission again.TM3 can support cyclic delay diversity (CDD, the Cyclic DelayDiversity) transmission of double fluid, also can support that the space frequency block coding (SFBC, space-frequencyblock codes) of single current transmits; TM4 belongs to Closed-Loop Spatial Multiplexing pattern, can support single current and stream transmission.TM8 equally both can support that single current also supported stream transmission, and for time division duplex (TDD) LTE system, order instruction (RI, Rank Information) reports and can join, not necessarily.
Adopt the mode of transmitting diversity to improve signal receiving performance for TM3, SFBC pattern, especially when low signal-to-noise ratio, relative to the CDD pattern for long time delay system, the systematic function of SFBC pattern is better.For TM4, TM4 stream transmission is (as situations such as interference between existence stream) under poor channel circumstance, due to the power reduction of each stream, precoding simultaneously also cannot accomplish orthogonality completely, so its performance may be good not as the performance of single-stream transmission; But under good channel circumstance, due to the increase of transmitting data stream number, higher power system capacity can be reached than single-stream transmission.Because channel circumstance is change, so how according to current channel circumstance, determine that reasonably transmits the major issue that fluxion also becomes the solution of LTE system needs.
The system of selection of self adaptation order is used for studying how to determine rational transmission rank according to current channel status, i.e. data fluxion; Meanwhile, consider the adjustment of associated parameter (modulation coding mode (MCS) etc.), ensure the throughput-maximized and stability of a system of entire system.In current LTE system, the system of selection of general self adaptation order is used in TM3, TM4.The switching sending SFBC and CDD pattern is carried out, for carrying out the switching of space division multiplexing list double fluid during TM4 for TM3.
The system of selection of existing self adaptation order is mainly based on the self adaptation order system of selection of maximum capacity, and Basic practice is: by judging the channel status under current channel condition, obtains the channel capacity that order is 1 or 2 transmission; The size of more described channel capacity, determines according to comparative result the order that next time, transmission used.The method embodies maximum capacity criterion as much as possible.But according to agreement, it is periodic that the feedback of the RI of physically based deformation ascending control channel (PUCCH) reports, the channel information of the single frame of simple consideration, the channel status of (as in one-period) cannot be embodied a period of time, carry out order and select also just cannot reach rational precision.
Summary of the invention
The invention provides the system of selection of a kind of self adaptation order, can accurately select suitable order.
A kind of self adaptation order system of selection that the embodiment of the present invention proposes comprises the steps:
The instantaneous order information of A, acquisition present frame;
B, judge that whether the instantaneous order information of present frame is identical with the order information of present frame reality, if so, keep the count value of order change accumulator constant, otherwise, order is changed the count value cumulative 1 of accumulator;
C, judge whether the instantaneous order information of accumulating a feedback cycle, if so, perform step D, otherwise return steps A;
The ratio of D, the calculating order change count value of accumulator and the frame number of feedback cycle, judge whether this ratio is greater than the first threshold value preset, if so, in next transmission cycle by order information updating, otherwise order information remains unchanged in next transmission cycle.
Preferably, described first threshold value is 60%.
Preferably, described steps A comprises further:
A1, estimate the signal to noise ratio of present channel, the order calculating present channel respectively according to signal to noise ratio is the order of 1 Shannon Capacity and present channel is 2 Shannon Capacities;
The percentage of A2, to calculate the order of present channel be the order of 2 Shannon Capacities and present channel to be the difference of 1 Shannon Capacity relative to the order of present channel be 1 Shannon Capacity;
A3, judge whether described percent value is greater than the second threshold value preset, if so, judge that instantaneous order information is as 2, otherwise judge that instantaneous order information is as 1.
Preferably, described second threshold value is 20%.
Preferably, judged result described in step B is yes, performs following steps:
Judge whether that order is 2 and double fluid can transmit data is less than alpha times of single current and can transmits data, if so, order is changed the count value cumulative 1 of accumulator, otherwise, keep the count value of order change accumulator constant.
Preferably, described alpha value is 1.05.
Preferably, be that order becomes 2 from 1 by order information updating described in step D, comprise further after order information updating:
In two streams, better the CQI grade of data flow lowers 3, is set to CQI1, and AMC outer shroud Dynamic gene is decided to be original m doubly;
On better data flow CQI grade basis, adjust the CQI grade CQI2 of another stream according to formula CQI2 ≈ CQI1-Δ SNR/2, Δ SNR is the difference of the signal to noise ratio of these two streams.
Preferably, described m value is 1.
Preferably, be that order becomes 1 from 2 by order information updating described in step D, comprise further after order information updating:
Single current CQI grade, when stream transmission, maximum CQI grade basis raises 2, and AMC outer shroud Dynamic gene is decided to be original n doubly simultaneously.
Preferably, described n value is 1.2.
As can be seen from the above technical solutions, the program takes into full account order feedback cycle feature, increases order information change accumulator, by limiting accumulator trigger condition and adding up order information change in one-period, the judgment criterion of last Corpus--based Method weight, determines the feedback order information in next cycle.Its technique effect is in the process of carrying out next cycle order feedback, consider the channel status of all descending sub frames in this cycle, and determine whether next transmission rank information changes, and order selection algorithm precision is high by certain criterion, more can embody channel status in a feedback cycle.
In the scheme that preferred embodiment of the present invention provides, in the process calculating current instantaneous order information, introduce the interference effect factor, between the stream that may exist multiple stream transmission, interference is included in multiple stream transmission Shannon Capacity statistics, by increasing instantaneous order information decision threshold, carrying out instantaneous order information and judging.Its technique effect is the impact considering the factors such as interference that stream transmission may exist, and the initial order information avoiding every subframe to determine is forbidden, and beats frequent.
Preferred embodiment scheme of the present invention is also according to feedback order information relatively last periodic transfer order information change, the initial condition of each data flow of the next transmission cycle of dynamic conditioning: modulation system, code rate, outer shroud regulatory factor etc., make it approach current order information characteristic as far as possible.Its technique effect is: consider other parameter adjustment that self adaptation order selection algorithm relates to simultaneously, when such as order becomes 2 from 1, how the initial condition of newly-increased data flow is determined, and original data stream is owing to adding a data flow, each data flow power reduces by half and can mutually disturb, and the state information before it also should do corresponding adjustment.In like manner, when order becomes 1 from 2, owing to decreasing a data flow, so power increases and is no longer subject to its interference by remaining traffic, ensuing transmission state also should adjust timely, avoids selecting to regulate slowly by AMC, can shorten on the one hand data stream transmitting stabilization time, on the other hand, stability and the throughput thereof of system data transmission can also be improved accordingly.
Accompanying drawing explanation
Fig. 1 is the basic procedure schematic diagram of the self adaptation order system of selection that the embodiment of the present invention proposes;
Fig. 2 is a kind of schematic flow sheet obtaining instantaneous order that the embodiment of the present invention proposes;
Fig. 3 is the Comparative result schematic diagram of the only scheme of application enhancements one and the emulation experiment of prior art;
Fig. 4 is the Comparative result schematic diagram of the only scheme of application enhancements two and the emulation experiment of prior art;
Fig. 5 is the Comparative result schematic diagram of the only scheme of application enhancements three and the emulation experiment of prior art;
Fig. 6 is application enhancements one, improves the Comparative result schematic diagram of two and the improvement technical scheme of three and the emulation experiment of prior art.
Embodiment
The self adaptation order system of selection that the present invention proposes mainly comprises three aspects relative to the improvement of prior art:
Improve one, in the process calculating current instantaneous order information, introduce the interference effect factor, between the stream that may exist multiple stream transmission, interference is included in multiple stream transmission Shannon Capacity statistics, by increasing instantaneous order information decision threshold, carrying out instantaneous order information and judging.
Improve two, by consider merely single frame order information change into statistics one-period in order information change, Corpus--based Method result determines the feedback order information in next cycle.
Improve three, according to feedback order information relatively last periodic transfer order information change, the initial condition of each data flow of the next transmission cycle of dynamic conditioning: modulation system, code rate, outer shroud regulatory factor etc., make it approach current order information characteristic as far as possible.
For making the feature of technical solution of the present invention and technique effect clearly, below by way of specific embodiment, the present invention is described in detail.
The basic procedure of the self adaptation order system of selection that the embodiment of the present invention proposes as shown in Figure 1, comprises the steps:
Step 101: the instantaneous order information obtaining present frame.
Instantaneous order refers to according to channel capacity maximization principle, may channel capacity corresponding to value be calculated out by each judging the order of present frame.The concrete grammar obtaining instantaneous order has a lot, and Fig. 2 shows wherein a kind of mode, comprises the steps:
Step 201: terminal, according to channel estimating, obtains current equivalent channel state information.
Below illustrate the estimation how carrying out signal to noise ratio (SNR).
Wherein H=U ∑ V
h, ∑=diag (λ
1, λ
2... λ
n) be diagonal matrix so when order is 1, can obtain:
When order is 2, obtain the signal to noise ratio of these two streams respectively:
Step 202: according to described equivalent channel state information, the order calculating present channel be respectively 1 and order be the Shannon Capacity of 2.
Shannon Capacity formula is:
C＝B*log2(1+SNR)
Wherein, C is the Shannon Capacity of channel, and B is channel width.
Power system capacity C1 when can to calculate order be respectively 1 and 2 by Shannon Capacity formula and C2.
Step 203: introduce the interference effect factor, judge current suitable instantaneous order information.
Disturb because stream transmission exists between certain stream, so when carrying out the selection of relevant order, introduce an interference effect factor decision threshold as instantaneous order information, if the double-current capacity obtained is less than, equals or slightly larger than single current capacity, the order information of so adjudicating present frame is still 1; When the difference of double-current capacity and single current capacity is greater than threshold value A relative to the percentage (i.e. (double-current capacity-single current capacity)/single current capacity × 100%) of single current Shannon Capacity, just judge that instantaneous order information is as 2, otherwise judge that instantaneous order information is as 1.In the embodiment of the present invention, this threshold value A is set to 20%.In actual applications, also according to actual conditions, this threshold value A can be set to other values.
Consider that stream transmission two code words cannot accomplish the imperfection of complete orthogonality and receiving terminal algorithm, according to above-mentioned criterion, only have (C2-C1)/C1 > 20%, just judge that the instantaneous order information of present frame is 2, otherwise instantaneous order information is 1.
Step 102: judge that whether the instantaneous order information of present frame is identical with the order information of present frame reality, if so, performs step 103; Otherwise go to step 104.
Step 103: judge whether that order is 2 and double fluid can transmit data is less than alpha times of single current and can transmits data, if so, then performs step 104, otherwise performs step 105.
Wherein, double fluid can transmit data to be determined by modulation system corresponding to current C QI grade and code check, the corresponding 16QAM (each symbol 4bit) of such as CQI8,0.4785 code check, and namely each stream symbol effectively transmits data is 4*0.4785=1.914; It is 2*1.914=3.828 that double fluid can transmit data.In like manner, single current can adjust thresholding threshold2 according to the preferably first-class CQI grade of double fluid and CQI and determines (single current CQI=max (CQI1 by transmitted bit, CQI2)+threshold2), in the present embodiment, alpha and threshold2 respectively value is 1.05 and 3.
Step 104: the count value cumulative 1 order being changed accumulator.Described order change accumulator is an initial value is the counter of 0, and its count value shows that the order needs having how many frames adjust.
Can find out according to above step, need cumulative order to change the count value of accumulator under having two kinds of situations: the first situation is that the instantaneous order information of present frame is different from the order information of present frame reality; The second situation is that the instantaneous order information of present frame is identical with the order information of present frame reality and order is 2, but double fluid can transmit data is not more than alpha times of single current and can transmits data.
Step 105: judge whether the instantaneous order information of accumulating a feedback cycle, if so, performs step 106, otherwise, return step 101.
Step 106: the ratio adding up order information change number and order Information Statistics number in a feedback cycle, judge whether this ratio is greater than the threshold value C preset, if so, perform order information updating in the next transmission cycle of step 107, namely original order is 1 and becomes 2, and originally order is 2 and becomes 1; Otherwise perform step 108, in next transmission cycle, order remains unchanged.Preferably, described threshold value C is taken as 60%.In actual applications, also according to actual conditions, threshold value C can be set to other values.Described transmission cycle can equal feedback cycle, also can be greater than feedback cycle.
Described order information change number is the count value of current order change accumulator; Order Information Statistics number is the number of the order information in an integration period, equals the effective descending sub frame number in an integration period.After step 206 is finished, order is changed the counting value returns of accumulator.
Also there is certain impact to other singal reporting code in the change of order, such as modulation system, code rate, and relevant adaptive modulation coding method etc.Switch to example with single current to double fluid, single-stream transmission uses whole power resources due to this stream, disturbs without between stream, its modulation system supported, code rate is also higher; But during stream transmission, two flow points enjoy power resource, so the modulation coding mode carrying out the actual support of transfer of data declines to some extent.The change of self adaptation order system of selection is reckoned without on the impact of other singal reporting codes in prior art.Such as, modulation coding mode higher when two streams all use single-stream transmission when being switched to double fluid, although a relatively stable value finally can be converged on by follow-up Adaptive Modulation and Coding (AMC) system of selection, but the initial transmission after each order change, the impact that can be subject to the factors such as channel quality indicates (CQI) inaccurate causes hydraulic performance decline in a transmission cycle, especially complicated at channel, order switches frequently in situation, and this impact more so.
Based on above-mentioned factor, embodiment of the present invention scheme, after step 107, can further include following steps:
Step 109: according to order information change situation, adjusts other initial state information of next transmission cycle, as MCS etc.
The object of step 109 is according to up-to-date feedback order information, and other relevant parameter of dynamic conditioning makes it approach current order feature as far as possible, and guarantee system is stablized as early as possible, improves systematic function.
When data fluxion changes, as become 2 from 1, or become 1 from 2, originally the modulation coding mode of use is no longer applicable to new transmission conditions, determines that rational modulation coding mode not only can improve systematic function as much as possible, can strengthen the stability of system data transmission simultaneously, saving overhead is also had very great help, especially complicated at channel condition, order information change is frequently in situation, and the meeting that this advantage should embody is more obvious.
By to the Adaptive Modulation and Coding Algorithm Analysis based on MI-ESM, the change of the relevant SNR that the inter-stage changes such as each CQI are corresponding is about 2dB, and when single current becomes double fluid, each stream power is thought and reduced by half, the power loss of about the 3dB that so can have an appointment; The statistics variations situation analysis of MCS change when being simultaneously 1 and 2 to fixing order, when carrying out stream transmission, considers the impact of interference etc., regulates each data flow initial transmission state.Specific as follows:
If order becomes 2 from 1, adjust as follows:
Step one: in two streams, better the CQI grade of data flow lowers 3, be set to CQI1, adaptive modulation and coding (AMC, Adaptive Modulation and Coding) outer shroud Dynamic gene is decided to be original m doubly, avoids CQI grade to lower the improper impact on throughput of system.
Step 2: according to the difference (the difference DELTA SNR reflection by the SNR of two streams) of two streams, on better data flow CQI grade basis, carry out corresponding CQI2 adjustment according to CQI change of rank; I.e. CQI2 ≈ CQI1-Δ SNR/2.
If order becomes 1 from 2, adjust as follows:
Single current CQI grade when stream transmission, maximum CQI grade basis was raised for 2 (being equivalent to consider the SNR change of about 4dB), and AMC outer shroud Dynamic gene is decided to be original n doubly simultaneously, avoids CQI grade to raise the improper impact on throughput of system.
Note, CQI is after adjustment, and minimum is 1, highest order 15.
In the emulation of current embodiment, get m=1; N=1.2.
The each parameter of each thresholding of this programme is the empirical value provided based on current simulated conditions and algorithm, if algorithm or other condition change, relevant threshold value also should do corresponding adjustment.
Can find out, technical solution of the present invention mainly comprises three aspects relative to the improvement of prior art, and these three aspects can reach following beneficial effect respectively:
1, Shannon Capacity is being utilized to calculate in the process of current instantaneous order information, introduce the interference effect factor, between the stream that may exist multiple stream transmission, interference is included in multiple stream transmission Shannon Capacity statistics, by increasing instantaneous order information decision threshold, carrying out instantaneous order information and judging.Its technique effect is the impact considering the factors such as interference that stream transmission may exist, and the initial order information avoiding every subframe to determine is forbidden, and beats frequent;
2, take into full account order feedback cycle feature, increase order information change accumulator, by limiting accumulator trigger condition and adding up order information change in one-period, the judgment criterion of last Corpus--based Method weight, determine the feedback order information in next cycle.Its technique effect is in the process of carrying out next cycle order feedback, consider the channel status of all descending sub frames in this cycle, and determine whether next transmission rank information changes, and order selection algorithm precision is high by certain criterion, more can embody channel status in a feedback cycle;
3, according to feedback order information relatively last periodic transfer order information change, the initial condition of each data flow of the next transmission cycle of dynamic conditioning: modulation system, code rate, outer shroud regulatory factor etc., make it approach current order information characteristic as far as possible.Its technique effect is: consider other parameter adjustment that self adaptation order selection algorithm relates to simultaneously, when such as order becomes 2 from 1, how the initial condition of newly-increased data flow determines (modulation system, code rate, carry out the outer shroud regulatory factor etc. of MCS selection), and original data stream is owing to adding a data flow, will inevitably produce interference to it, the state information before it also should do corresponding adjustment.In like manner, when order becomes 1 from 2, owing to decreasing a data flow, so remaining traffic no longer will be subject to its interference, ensuing transmission state also should adjust timely, avoids selecting to regulate slowly by AMC, can shorten on the one hand data stream transmitting stabilization time, on the other hand, stability and the throughput thereof of system data transmission can also be improved accordingly.
Result below by way of emulation experiment proves above-mentioned beneficial effect.Fundamental simulation parameter and channel parameter are distinguished as shown in Table 1 and Table 2:
| Parameter name | Value |
| DL_Nt | 8 |
| DL_Nr | 2 |
| Carrier frequency | 2.6GHz |
| System bandwidth | 20MHz |
| CP type | Normal CP |
| UL/DL configures (UL_DL_Config) | 1 |
| Special subframe configures | 7 |
| CFI | 3 |
| CU number of resource blocks | 8RB |
| ChanEstiType_Cell | (MMSE) |
| ChanEstiType_UE | (LS) |
| ChanMeasureType | (non-ideal) |
| SRS channel estimating | LSPP |
| Equalization algorithm | MMSE |
| Coded system | Turbo |
| UE translational speed | 3km/h |
Table 1
| Parameter name | Value |
| ChanModel | SCME |
| DisOfMsAntennas | 0.65λ |
| DisOfBsAntennas | 0.65λ |
| ChannelScenario | UMa |
| ScmOptions | ′polarized′ |
| FixedAnglesUsed | ′yes′ |
| FixedPdpUsed | ′yes′ |
| BsUrbanMacroAS | ′eight′ |
| ChannelContinuity | 0 |
| LowerSampling | 1 |
Table 2
At channel kept stable, change slowly environment, because RI information is in a stable state for a long time, adopting the present invention program to promote effect to systematic function is not clearly.But under channel variation faster scene, because RI conversion is comparatively frequent, it is comparatively obvious that this algorithm relates to that interference factor, periodic state statistics and MCS be correlated with that the impact of adjusting module can embody.(method0 represents prior art to provide several simulation result as example below, methodl represents the embodiment of the present invention), wherein Fig. 3-5 sets forth the gain of the improvement project hinge structure applying separately an aspect in technical solution of the present invention, and Fig. 6 gives the gain that rear hinge structure is applied in these three aspects simultaneously.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (9)
1. the system of selection of self adaptation order, is characterized in that, comprises the steps:
The instantaneous order information of A, acquisition present frame; Comprise:
A1, estimate the signal to noise ratio of present channel, the order calculating present channel respectively according to signal to noise ratio is the order of 1 Shannon Capacity and present channel is 2 Shannon Capacities;
The percentage of A2, to calculate the order of present channel be the order of 2 Shannon Capacities and present channel to be the difference of 1 Shannon Capacity relative to the order of present channel be 1 Shannon Capacity;
A3, judge whether described percent value is greater than the second threshold value preset, if so, judge that instantaneous order information is as 2, otherwise judge that instantaneous order information is as 1;
B, judge that whether the instantaneous order information of present frame is identical with the order information of present frame reality, if so, keep the count value of order change accumulator constant, otherwise, order is changed the count value cumulative 1 of accumulator;
C, judge whether the instantaneous order information of accumulating a feedback cycle, if so, perform step D, otherwise return steps A;
The ratio of D, the calculating order change count value of accumulator and the frame number of feedback cycle, judge whether this ratio is greater than the first threshold value preset, if so, in next transmission cycle by order information updating, otherwise order information remains unchanged in next transmission cycle.
2. method according to claim 1, is characterized in that, described first threshold value is 60%.
3. method according to claim 1, is characterized in that, described second threshold value is 20%.
4. method according to claim 1, is characterized in that, judged result described in step B is yes, performs following steps:
Judge whether that order is 2 and double fluid can transmit data is less than alpha times of single current and can transmits data, if so, order is changed the count value cumulative 1 of accumulator, otherwise, keep the count value of order change accumulator constant.
5. method according to claim 1, is characterized in that, described alpha value is 1.05.
6. the method according to any one of claim 1 to 5, is characterized in that, is that order becomes 2 from 1, comprises further after order information updating described in step D by order information updating:
In two streams, better the CQI grade of data flow lowers 3, is set to CQI1, and AMC outer shroud Dynamic gene is decided to be original m doubly;
On better data flow CQI grade basis, adjust the CQI grade CQI2 of another stream according to formula CQI2 ≈ CQI1-Δ SNR/2, Δ SNR is the difference of the signal to noise ratio of these two streams.
7. method according to claim 6, is characterized in that, described m value is 1.
8. the method according to any one of claim 1 to 5, is characterized in that, is that order becomes 1 from 2, comprises further after order information updating described in step D by order information updating:
Single current CQI grade, when stream transmission, maximum CQI grade basis raises 2, and AMC outer shroud Dynamic gene is decided to be original n doubly simultaneously.
9. method according to claim 8, is characterized in that, described n value is 1.2.
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