CN102739378B - Adaptive virtual hybrid retransmission method applicable to satellite mobile communication system - Google Patents
Adaptive virtual hybrid retransmission method applicable to satellite mobile communication system Download PDFInfo
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Abstract
The invention discloses an adaptive virtual hybrid retransmission method applicable to a satellite mobile communication system. Firstly, a receiving end forecasts and estimates the channel quality during signal sending at a sending end according to a received pilot signal, jointly selects a correct transmission encoding and modulation mode with the maximum rate and a plurality of redundant versions of the same encoding block, which are sent at one time, and feeds back a selection result to the sending end; the sending end calculates the length of a transmission block on the basis of the number of available resource particles according to the selected encoding and modulation mode and an equivalent code rate corresponding to the number of the redundant versions of the encoding block, which are sent at one time, to finish channel encoding, rate matching and modulation; a channel adaptively sends one or more redundant versions at one time in a given time frequency resource block; and finally, the receiving end receives data, and then combines and decodes a plurality of possibly sent redundant versions according to a hybrid automatic repeat request (HARQ) decoding mode. By using the method, the reliability of a link is improved; and the method is applicable to the satellite mobile communication system which is large in transmission time delay and has a power limitation characteristic.
Description
Technical field
The present invention relates to link circuit self-adapting and mix retransmission mechanism, the particularly virtual hybrid repeat method of a kind of self adaptation (being HARQ), for improving the adaptive link method of satellite mobile communication link reliability.
Background technology
Compatible land mobile communication system is the development trend of satellite mobile communication.At present, propose some and be intended to realize satellite and the maximized innovative design of 4G ground air interface general character.These designs are for the particularity of satellite channel, and the nonlinear distortion that the power amplifier for example loading causes, large transmission delay and time diversity reduction etc., made necessary amendment and ensured other parts and ground scheme compatibility simultaneously.Therefore, under outstanding ground and satellite environment, the difference of mobile transmission model is very important.In fact in ground is disposed, by adopting chance scheduling, for the good time slot of each user's selective channel condition and bandwidth have been offset the temporal frequency selectivity decline of channel.But the feature of satellite link large propagation time delay, has hindered between user and ground based terminal and to have continued in time exchange between channel quality parameter and detectable signal.Thereby traditional HARQ and adaptive technique all can not directly apply to satellite communication system.
Summary of the invention
Object of the present invention is just to solve existing LTE technology and directly applies to the defect in satellite communication system, has proposed the virtual HARQ method of self adaptation of compatible LTE a kind of, has improved the link reliability of satellite communication system.
To achieve these goals, technical scheme of the present invention is achieved in that a kind of virtual hybrid repeat method of self adaptation that is applicable to satellite mobile communication system, comprises the following steps:
1) receiving terminal is according to the pilot signal receiving, and the channel quality of transmitting terminal signal delivery time is estimated in prediction; Associating selection can correctly be transmitted and the code modulation mode of speed maximum and the same encoding block redundancy version given figure once sending, and the indication information of selection result is fed back to transmitting terminal;
2) transmitting terminal according to selected code modulation mode and once send the corresponding equivalent code check of encoding block redundancy version given figure, calculate transport block length according to available resources population in given time/frequency source block, complete chnnel coding, rate-matched and modulation, realize the once transmission of single or multiple redundancy versions in given time/frequency source block channel self-adapting;
3) if transmitting terminal selects once to send multiple redundancy versions, receiving terminal merges decoding to multiple redundancy versions according to the virtual HARQ decoding process of self adaptation after receiving data.
Beneficial effect: this invention has realized expansion and the enhancing to 3GPP LTE Adaptive Modulation and Coding, has improved the reliability of link, is applicable to have the satellite mobile communication system of large propagation delay time and power limited feature.
Brief description of the drawings
Fig. 1 is the virtual hybrid repeat method flow chart of self adaptation that the present invention is applicable to satellite mobile communication system;
Fig. 2 is the schematic diagram of the constructing virtual HARQ of embodiment of the present invention institute method expansion code check;
Fig. 3 is the schematic diagram that the spectrum efficiency of embodiment of the present invention system in the time of K=9 increases with signal to noise ratio.
Embodiment
The virtual hybrid repeat method of self adaptation that is applicable to satellite mobile communication system, comprises the following steps:
1) receiving terminal is according to the pilot signal receiving, and the channel quality of transmitting terminal signal delivery time is estimated in prediction; Associating selection can correctly be transmitted and the code modulation mode of speed maximum and the multiple redundancy versions of same encoding block that once send, and the indication information of selection result is fed back to transmitting terminal;
2) transmitting terminal according to selected code modulation mode and once send the corresponding equivalent code check of encoding block redundancy version given figure, calculate transport block length according to available resources population in given time/frequency source block, complete chnnel coding, rate-matched and modulation, realize the once transmission of single or multiple redundancy versions in given time/frequency source block channel self-adapting;
3) if transmitting terminal selects once to send multiple redundancy versions, receiving terminal merges decoding to multiple redundancy versions according to the virtual HARQ decoding process of self adaptation after receiving data.
In described step 1), the channel quality that receiving terminal is estimated according to prediction, the encoding block redundancy version given figure of selecting modulation coding mode and once sending, mode is as follows:
The redundancy versions production method of the modulation coding mode of supporting according to system and same encoding block, determines and can be used for adaptively selected send mode set.The combination of the corresponding a kind of modulation coding mode of each send mode and a quantity forwarded of a kind of redundancy versions.
Obtain the frame error rate (BLER) of each possibility send mode (quantity forwarded of modulation coding mode and redundancy versions) under different signal to noise ratio (snr)s by link simulation, make SNR-BLER form and store.Based on above table, the adaptively selected of send mode can be realized as follows:
First calculate the equivalent SINR of available resource block according to the SINR of all sampling resource particle
eff, SINR
effcalculation expression as follows:
Wherein (n, k) represents the resource particle place OFDM symbol of sampling and the numbering of subcarrier, and N represents all sampling OFDM symbolic numbers, K represent to sample in the each symbol sum of subcarrier; SINR
n, krepresent the Signal to Interference plus Noise Ratio in sampling resource particle (n, k); I(x) be compression function, also referred to as information measure function, I
-1(x) be I(x) inverse function.
Then equivalent SINR
efflist of input, according to the frame error rate level of expecting, finds out this equivalence SINR
effsupported and there is modulation coding mode and the redundancy versions of high information rate and once send number.Specific implementation process can be as follows:
The corresponding information rate of all possible send mode (quantity forwarded of modulation coding mode and redundancy versions) is sorted from big to small, and the information rate calculation expression of each send mode is: information rate=order of modulation * code check/redundancy versions once sends number.Then by the various send modes of the descending sequential search of information rate, if the required SNR value of given BLER is greater than equivalent SINR in searched send mode SNR-BLER form
eff, represent this equivalence SINR
effcan not support this information rate, need to continue down search, until find supported information rate, under send mode corresponding to this information rate, the required SNR value of given BLER is less than or equal to equivalent SINR
eff.
Described step 2) in, specific implementation step is as follows: according to selected code modulation mode and once send the corresponding equivalent code check of encoding block redundancy version given figure, calculate transport block length based on available resources population in given time/frequency source block, based on the modulation coding mode of selecting, carry out chnnel coding and rate-matched according to the specification of 3GPP LTE/LTEA, generate needed multiple redundancy versions, modulation after multiple redundancy versions fields according to certain rules orthogonal mapping arrive whole Resource Block.
Described whole Resource Block can be the single TTI of 3GPP LTE specification, can be also continuous multiple TTI, or multiple TTI uniformly-spaced separating.
In described step 3), receiving terminal is receiving after the signal of described Resource Block, according to the mapping mode of redundancy versions, reception signal demapping corresponding each redundancy versions is also carried out respectively to soft demodulation, rate de-matching, then multiple redundancy versions are merged to decoding.
Below in conjunction with accompanying drawing, the invention will be further described.
Receiving terminal in example of the present invention is according to the pilot frequency sequence receiving, the channel quality of transmitting terminal signal delivery time is estimated in prediction, associating selection can correctly be transmitted and the coded modulation level of speed maximum and the multiple redundancy versions of same encoding block that once send, and the indication information of selection result is fed back to transmitting terminal.Transmitting terminal according to selected code modulation mode and once send the corresponding equivalent code check of encoding block redundancy version given figure, complete chnnel coding, rate-matched and modulation, realize the once transmission of single or multiple redundancy versions at continuous multiple TTI channel self-adapting.
Fig. 1 is the specific implementation step that the present invention is applicable to the virtual hybrid repeat method of self adaptation of satellite mobile communication system:
The pilot frequency sequence that step 1, user's receiving terminal send according to the satellite receiving adopts young waiter in a wineshop or an inn's variance LS algorithm or least mean-square error MMSE algorithm to estimate current channel information, and calculates the Signal to Interference plus Noise Ratio on pilot resources particle
Step 2, according to the equivalent SINR of the pilot resources particle snr computation available resource block calculating in step 1
eff, SINR
effcalculation expression as follows:
Wherein (n, k) represents the numbering of pilot resources particle place OFDM symbol and subcarrier, and N represents all OFDM symbolic numbers that contain pilot resources plum, and K represents the sum of pilot frequency locations subcarrier in each OFDM symbol; SINR
n, krepresent the Signal to Interference plus Noise Ratio on pilot resources particle (n, k); I(x) be compression function, also referred to as information measure function, I
-1(x) be I(x) inverse function;
Step 3, the equivalent SINR in step 2
effsignal to noise ratio-frame error rate form that input obtains by link level simulation, according to the frame error rate level of expecting, finds out this equivalence SINR
effsupported and there is modulation coding mode and the redundancy versions of high information rate and once send number; Specific implementation process can be as follows:
The corresponding information rate of all possible send mode (the corresponding a kind of modulation coding mode of every kind of mode and redundancy versions once send the combination of number) is sorted from big to small, and the information rate calculation expression of each send mode is: information rate=order of modulation * code check/redundancy versions once sends number; Then by the various send modes of the descending sequential search of information rate, if the required snr value of given BLER is greater than equivalent SINR in the signal to noise ratio of searched send mode and frame error rate form
eff, represent this equivalence SINR
effcan not support this information rate, need to continue down search, until find supported information rate, under send mode corresponding to this information rate, the required snr value of given BLER is less than or equal to equivalent SINR
eff.
The indication information that receiving terminal once sends number the modulation coding mode of selecting as stated above and redundancy versions feeds back to transmitting terminal; It is pointed out that the coded modulation level of supporting in 3GPP LTE/LTE-A standard has 27 kinds, corresponding 27 kinds of code checks; In the present invention, support the multiple redundancy versions in HARQ to send simultaneously or continuously, expanded the support quantity of equivalent code check; Because each encoding block in LTE can generate at most 4 redundancy versions, therefore can expand at most 108 kinds of equivalent code checks, as shown in Figure 2.
Step 4, transmitting terminal are according to modulation coding method and the corresponding equivalent code check of redundancy versions number selection result, resource particle sum based on available calculates transport block length, based on the modulating-coding level of selecting, carry out chnnel coding and rate-matched according to the specification of 3GPP LTE/LTEA, generate needed multiple redundancy versions, modulation after multiple redundancy versions fields according to certain rules orthogonal mapping arrive given time/frequency source block.Time/frequency source block can be single or continuous multiple TTI, or multiple TTI uniformly-spaced separating, to obtain as far as possible time diversity;
Step 5, receiving terminal, receiving after Resource Block signal, according to the mapping mode of redundancy versions, also carry out respectively soft demodulation, rate de-matching reception signal demapping corresponding each redundancy versions, and then multiple redundancy versions merge decoding.
The method providing from the embodiment of the present invention can find out, the embodiment of the present invention can not only compatible LTE, and the redundancy version given figure that can select adaptively modulation coding mode and send continuously, can under the condition that does not change transmitting terminal, reduce code check; The virtual HARQ technology that the embodiment of the present invention is used can significantly improve the correct probability receiving of information, improves the link reliability of satellite communication system.
Emulation platform and parameter setting
With reference to relevant criterion TS36.211, TS36.212 and TS36.213 in LTE
[1-3], utilize MATLAB and C language to build the emulation platform of Satellite Mobile Channels, foregoing invention is carried out to link level simulation assessment.The important parameter of some of them is as shown in the table.
In the emulation of satellite downlink, adopt the LTE frame structure of regular circulation prefix (CP), a subframe has 14 OFDM symbols, and taking a subframe (1ms) as 1 TTI, transmission bandwidth is 1.4MHz, accounts for altogether 6 Resource Block (RB).1 transmitting antenna of satellite configuration and telex network, user configures a reception antenna, and channel model is Rice channel model.
| Parameter | Parameter arranges |
| Carrier frequency | 2GHz |
| Transmission bandwidth | 1.4MHz |
| RB number | 6 |
| Sub-band division | 1 |
| Chnnel coding | Turbo coding |
| Antenna configuration | 1Tx1Rx |
| Channel | Rice channel, K=9 |
| Doppler frequency deviation | 200Hz |
| Channel estimating | Ideal communication channel is estimated |
| Feedback interval | 1TTI |
| Delay of feedback | 130TTIs |
The simulation result of Fig. 3 shows: in figure, provide respectively the self adaptation result that does not use HARQ to carry out speed expansion and use HARQ to carry out the result of speed expansion (extending to 108 kinds of equivalent code checks).Can see, adopt the spectrum efficiency that method that HARQ carries out speed expansion can effective system in middle low signal-to-noise ratio interval.The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of making within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (2)
1. the virtual hybrid repeat method of self adaptation that is applicable to satellite mobile communication system, is characterized in that, comprises the following steps:
1) receiving terminal is according to the pilot signal receiving, and the channel quality of transmitting terminal signal delivery time is estimated in prediction; Associating selection can correctly be transmitted and the code modulation mode of speed maximum and the multiple redundancy versions of same encoding block that once send, and the indication information of selection result is fed back to transmitting terminal;
2) transmitting terminal according to selected code modulation mode and once send the corresponding equivalent code check of encoding block redundancy version given figure, calculate transport block length according to available resources population in given time/frequency source block, complete chnnel coding, rate-matched and modulation, realize the once transmission of single or multiple redundancy versions in given time/frequency source block channel self-adapting;
3) if transmitting terminal selects once to send multiple redundancy versions, receiving terminal merges decoding to multiple redundancy versions according to the virtual HARQ decoding process of self adaptation after receiving data;
Described step 1) in, the channel quality that receiving terminal is estimated according to prediction, the encoding block redundancy version given figure of selecting modulation coding mode and once sending, mode is as follows:
The redundancy versions production method of the modulation coding mode of supporting according to system and same encoding block, determines and can be used for adaptively selected send mode set; The combination of the corresponding a kind of modulation coding mode of each send mode and a quantity forwarded of a kind of redundancy versions;
Obtain the frame error rate of each send mode under different signal to noise ratios by link simulation, make the form of signal to noise ratio and frame error rate and store, based on above table, the adaptively selected of send mode can be realized as follows:
First according to the equivalent SINR of the snr computation available resource block of all sampling resource particle
eff, SINR
effcalculation expression as follows:
Wherein (n, k) represents the resource particle place OFDM symbol of sampling and the numbering of subcarrier, and N represents all sampling OFDM symbolic numbers, K represent to sample in the each symbol sum of subcarrier; SINR
n, krepresent the Signal to Interference plus Noise Ratio in sampling resource particle (n, k); I (x) is compression function, also referred to as information measure function, I
-1(x) be the inverse function of I (x);
Then equivalent SINR
efflist of input, according to the frame error rate level of expecting, finds out this equivalence SINR
effsupported and there is modulation coding mode and the redundancy versions of high information rate and once send number; Specific implementation process can be as follows:
Corresponding all possible send mode information rate is sorted from big to small, and the information rate calculation expression of each send mode is: information rate=order of modulation * code check/redundancy versions once sends number; Then by the various send modes of the descending sequential search of information rate, if the required snr value of given BLER is greater than equivalent SINR in the signal to noise ratio of searched send mode and frame error rate form
eff, represent this equivalence SINR
effcan not support this information rate, need to continue down search, until find supported information rate, under send mode corresponding to this information rate, the required snr value of given BLER is less than or equal to equivalent SINR
eff;
Described step 2) in, specific implementation step is as follows: according to selected code modulation mode and once send the corresponding equivalent code check of encoding block redundancy version given figure, calculate transport block length based on available resources population in given time/frequency source block, based on the modulation coding mode of selecting, carry out chnnel coding and rate-matched according to the specification of 3GPP LTE/LTEA, generate needed multiple redundancy versions, modulation after multiple redundancy versions fields according to certain rules orthogonal mapping arrive whole Resource Block;
Described step 3) in, receiving terminal is receiving after the signal of described Resource Block, according to the mapping mode of redundancy versions, reception signal demapping corresponding each redundancy versions is also carried out respectively to soft demodulation, rate de-matching, then multiple redundancy versions are merged to decoding.
2. the virtual hybrid repeat method of self adaptation according to claim 1, is characterized in that, described whole Resource Block can be the single TTI of 3GPP LTE specification, can be also continuous multiple TTI, or multiple TTI uniformly-spaced separating.
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| CN108513363B (en) * | 2017-02-24 | 2022-02-11 | 中国移动通信有限公司研究院 | Information transmission method, user equipment and base station |
| CN107181575B (en) * | 2017-04-27 | 2020-06-30 | 工业和信息化部电信研究院 | Self-adaptive hybrid automatic retransmission method |
| CN109120373B (en) * | 2017-06-23 | 2021-02-12 | 华为技术有限公司 | Channel coding method, data receiving method and related equipment |
| US10862620B2 (en) * | 2017-09-25 | 2020-12-08 | Dolby Laboratories Licensing Corporation | Systems and methods to optimize the load of multipath data transportation |
| CN111490858B (en) * | 2019-01-29 | 2021-11-19 | 华为技术有限公司 | Adaptive transmission method, device and system for satellite communication |
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| FI20205925A1 (en) * | 2020-09-24 | 2022-03-25 | Nokia Technologies Oy | Rate adaptation |
| CN114124294A (en) * | 2021-04-13 | 2022-03-01 | 中兴通讯股份有限公司 | Adaptive modulation coding method, base station and storage medium |
| CN115701008A (en) * | 2021-07-15 | 2023-02-07 | 中兴通讯股份有限公司 | Data transmission method, data receiving method, device, electronic equipment and storage medium |
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