CN101692620A - Uplink SU-MIMO layer switching method in LTE-A - Google Patents
Uplink SU-MIMO layer switching method in LTE-A Download PDFInfo
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- CN101692620A CN101692620A CN200910023792A CN200910023792A CN101692620A CN 101692620 A CN101692620 A CN 101692620A CN 200910023792 A CN200910023792 A CN 200910023792A CN 200910023792 A CN200910023792 A CN 200910023792A CN 101692620 A CN101692620 A CN 101692620A
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Abstract
The invention discloses an uplink SU-MIMO layer switching method in LTE-A, belonging to the mobile communications field. The invention aims to solve the problem that retransmission is very limited to the improvement of user information throughput and the peak rate and high spectrum efficiency of users are hard to reach. The method comprises the following steps: mapping scrambled and modulated amplitude modulation symbol according to the layer mapping method of downlink Release-8 to one or more transmission layers; exchanging data of all transmission layers between different transmission layers according to modulation symbol level, SC-FDMA symbol level or time slot level; combining the data processed through layer exchanging with retransmission mode and transmitting different layer exchanging copies by transmitting terminal according to different retransmission times. The combination of layer exchanging and retransmission mode provided by the invention can increase the accuracy of data retransmission and has the advantage of reaching the peak rate and high spectrum efficiency of users, thus the method of the invention can be used in the fourth generation of mobile communication field.
Description
Technical field
The invention belongs to field of mobile communication, be specifically related to the layer switching method of up SU-MIMO among a kind of LTE-A.
Background technology
In existing senior Long Term Evolution LTE-A system, up multiple-input and multiple-output MIMO is considered to one of key technology among the LTE-A.In order to reach higher peak rate and spectrum efficiency, the space multiplexing technique of introducing up link is inevitable.Reach among the TR36.913 parameter demand with this about up link.In addition, with respect to the advanced techniques of relaying and multipoint cooperative and so on, uplink single user MIMO can be regarded as the first step from Long Term Evolution LTE to senior Long Term Evolution LTE-A upgrading.And in 3GPP meeting recently, some motions propose the performance that layer-switching technologies can improve the Single User MIMO up link.
At present, a kind of layer-switching technologies that is used for Single User MIMO up link 2 or 4 transmit antennas is entered on, layer-switching technologies can obtain certain diversity gain from each code stream, thereby the layer mapping method in the up link of raising user performance while LTE-A can use the mapping method same with down link Release-8.
In 56 and 57 meetings of 3GPP, reached following common recognitions about the layer exchange of uplink single user:
1. maximum code word numbers of transmitting terminal transmission are two;
Layer exchanged form by level and substantially buanch unit different be divided into following three kinds of structures:
First kind of layer exchange that structure is a modulation symbol level;
Second kind of layer exchange that structure is the SC-FDMA symbol level;
The third structure is timeslot-level layer exchange;
3. be not have the binding of HARQ-ACK space and do not have the mode of layer exchange and the binding of HARQ-ACK space is arranged and the comparison of the mode of layer exchange is arranged about the manner of comparison of layer switching performance;
Existing layer switching method about the up SU-MIMO of LTE-A, it mainly is the simple layer exchange that each transport layer is carried out at modulation symbol level, SC-FDMA symbol level and timeslot-level these three kinds of modes, when the transport block transmission mistake, by mixing automatic repeat requests mechanism HARQ, just transmit identical layer switch version at every turn when retransmitting and improve systematic function.
The core concept of this class layer switching method be through after the layer mapping with each transport layer based on modulation symbol level, SC-FDMA symbol level and timeslot-level the exchange, in case during the transport block transmission mistake, to utilize retransmission mechanism, resend the data of transmission last time, during each the re-transmission, the every layer swap data that antenna transmission is identical.Though it is simpler that this method implements for transmitting terminal and receiving terminal, can guarantee user's throughput to a certain extent, this method has the following disadvantages:
When the channel of the signal data of every layer of transmission experience is the relatively poor all the time slow fading channel of performance, when data transmission fault that transmitting terminal sends, need utilize retransmission mechanism, at this moment transmitted the last time that resends data will with transmitted data last time and on the identical traffic layer, transmit, experience similar channel status, cause the erroneous transmissions of data retransmission; Because it is very limited improving user throughput by re-transmission, thereby difficult user's peak rate and the higher spectrum efficiency of reaching.
Summary of the invention
The objective of the invention is to overcome above-mentioned existing problem, propose the layer switching method of up SU-MIMO among a kind of LTE-A,, improve user's peak rate and higher spectrum efficiency to guarantee the correctness of data retransmission.
Realize that the object of the invention technical scheme is: at first, will be mapped on one or more transport layer through the complex value modulation symbol of scrambling and modulation layer mapping method according to down link Release-8; Then, the data on all transport layers are carried out the exchange of each transport layer according to modulation symbol level, SC-FDMA symbol level or timeslot-level mode; At last, will combine with the re-transmission mode through the data of layer exchange, according to different number of retransmissions, transmitting terminal sends different layer exchange copies.Concrete constitution step comprises:
(1) according to the code word and the transport layer of transmitting terminal transmission, will be code word, be mapped on one or more transport layer through the complex value modulation symbol of scrambling and modulation;
(2) data on all transport layers are carried out the exchange of each transport layer according to modulation symbol level or SC-FDMA symbol level or timeslot-level mode, each layer data is mapped on the different virtual-antennas transmits, finish the layer exchange process that the user is transmitted data;
(3) will combine with the re-transmission mode through the data of layer exchange, when user's New Development error in data transmits, utilize mixed automatic retransmission mechanism, when retransmitting for the first time, the ground floor data that to transmit last time resend on second transport layer, launch by second antenna; The second layer data that to transmit last time resend on first transport layer, launch by first antenna.
The layer switching method of up SU-MIMO has following advantage among the designed LTE-A of the present invention:
1. utilize layer-switching technologies can from each code stream, obtain certain diversity gain, thereby improve user's throughput;
2. layer exchange combined with the re-transmission mode, both considered that re-transmission can reduce the Channel Transmission error rate and improve the characteristics of user performance to guarantee service quality, the channel conditions that has been experienced when having considered the signal data transmission again, thereby obtain more diversity gain, improve the correctness of data retransmission, reach user's peak rate and higher spectrum efficiency.
3. layer switching method is a static configuration, does not all have the raising of complexity for user and base station.
Description of drawings
Fig. 1 is a layer exchange flow chart of the present invention;
Fig. 2 is the layer exchange transmitting terminal schematic diagram among the present invention;
Fig. 3 is existing two numerals to four a transport layer mapping schematic diagram;
Fig. 4 is that modulation symbol level layer exchange of the present invention combines schematic diagram with number of retransmissions;
Fig. 5 is that timeslot-level layer exchange of the present invention combines schematic diagram with number of retransmissions;
Fig. 6 is a modulation symbol level layer exchange emulation schematic diagram of the present invention;
Fig. 7 is a timeslot-level layer exchange emulation schematic diagram of the present invention.
Embodiment
The layer switching method of the up SU-MIMO that the present invention proposes, in order to keep low peak-to-average force ratio value, layer exchange is to carry out in time domain.It mainly considers two aspects: be to carry out the exchange of different layers according to modulation symbol level and timeslot-level these two kinds of basic modes on the one hand; Be on the other hand when user data transmission makes a mistake,, on different layers, transmit transmitting data the last time that resends according to different number of retransmissions.
With reference to Fig. 1, layer exchange step of the present invention is as follows:
At first, determine the number of codewords and the transport layer number of transmitting terminal transmission; Adopt the layer mapping method of down link Release-8 then, finish the layer mapping of spatial reuse.
Wherein, code word refers to constitute the output of QAM modulation module through QAM modulation and FEC coded data stream; Transport layer indicates true QAM modulated data stream, is the output that code word arrives layer mapping block;
Concrete layer mapping process such as table 1, it is mapped to the complex value modulation symbol in each code word on one or more layer, and what be about to code word q duplicates modulation symbol d
(q)(0) ..., d
(0)(M
Symb (q)-1) is mapped to a layer x (i)=[x
(0)(i) ... x
(υ-1)(i)]
TOn,
υ presentation layer number wherein, M
Symb LayerIt is the modulation symbol number in each layer.
Table 1 is the layer mapping standard of existing down link spatial reuse:
2.1 according to level and Basic Transmission Unit, a mode of setting layer exchange is: modulation symbol level, SC-FDMA symbol level and timeslot-level three kinds, these three kinds of modes specifically describe as follows:
(a) the layer exchange of modulation symbol level
Being in a subframe, is that the unit carries out layer exchange with each transport layer data with the modulation symbol level.
(b) the layer exchange of SC-FDMA symbol level
Being in a subframe, is that the unit carries out layer exchange with each transport layer data with the SC-FDMA symbol level.
(c) timeslot-level layer exchanges
Being in a subframe, is that the unit carries out layer exchange with each transport layer data with timeslot-level.
2.2, then the data map of each transport layer is transmitted to different virtual-antennas with any exchange of carrying out each transport layer in modulation symbol level, SC-FDMA symbol level and timeslot-level these three kinds of modes.
If a) adopt the layer exchange of modulation symbol level mode, then earlier with first transport layer data and second transport layer data exchange, then first transport layer data is mapped on first antenna and transmits, second transport layer data is mapped on second antenna transmits.
B) if adopt the layer exchange of SC-FDMA symbol level mode, then earlier with first transport layer data and second transport layer data exchange, then first transport layer data is mapped on first antenna and transmits, second transport layer data is mapped on second antenna transmits.
C) if adopt the layer exchange of timeslot-level mode, then earlier with first transport layer data and second transport layer data exchange, then first transport layer data is mapped on first antenna and transmits, second transport layer data is mapped on second antenna transmits.
With two transport layers is example, and its process of transmitting is as follows:
(3.1) when user's New Development data transmission fault, utilize mixed automatic retransmission mechanism, when retransmitting user data for the first time, the ground floor user New Development data that will transmit last time resend on second transport layer, launch by second antenna.
(3.2) second layer user New Development data of transmission last time resend on first transport layer, launch by first antenna.
Above-mentioned steps 3.1 and 3.2 all is applicable to modulation symbol level, SC-FDMA symbol level and timeslot-level different transport layer exchanged forms.
Effect of the present invention can further specify by following emulation:
A. simulated conditions
The transmitting terminal block diagram of emulation of the present invention as shown in Figure 2, it uses two code words, four transport layers, four reception antennas of four transmit antennas, maximum retransmission is three times.Wherein the data of code word 1 are divided into two flow datas according to the odd number even number, are mapped to respectively on first and second transport layer, and the data of code word 2 are divided into two flow datas according to the odd number even number, are mapped to respectively on the 3rd and the 4th transport layer, as shown in Figure 3.
When adopting the transport layer exchanged form of modulation symbol level,, retransmit altogether three times if user side New Development data transmission fault then utilizes to mix automatically to retransmit; When retransmitting for the first time, transmit on transmission data map to the first antenna with the second layer, transmit on transmission data map to the second antenna of ground floor, transmit on three antennas of the 4th layer transmission data map to the, transmit on four antennas of the 3rd layer transmission data map to the; When retransmitting for the second time, to transmit on the 3rd layer transmission data map to the first antenna, transmit on the 4th layer transmission data map to the second antenna, transmit on three antennas of the transmission data map to the of ground floor, transmit on four antennas of the transmission data map to the of the second layer; When retransmitting for the third time, to transmit on the 4th layer transmission data map to the first antenna, transmit on the 3rd layer transmission data map to the second antenna, transmit on three antennas of the transmission data map to the of the second layer, transmit on four antennas of the transmission data map to the of ground floor, as shown in Figure 4.
When adopting timeslot-level transport layer exchanged form, if user side New Development data transmission fault, then utilize to mix automatically and retransmit, retransmit altogether three times, when retransmitting for the first time, transmit on transmission data map to the first antenna with the second layer, transmit on transmission data map to the second antenna of ground floor, transmit on three antennas of the 4th layer transmission data map to the, transmit on four antennas of the 3rd layer transmission data map to the; When retransmitting for the second time, to transmit on the 3rd layer transmission data map to the first antenna, transmit on the 4th layer transmission data map to the second antenna, transmit on three antennas of the transmission data map to the of ground floor, transmit on four antennas of the transmission data map to the of the second layer; When retransmitting for the third time, to transmit on the 4th layer transmission data map to the first antenna, transmit on the 3rd layer transmission data map to the second antenna, transmit on three antennas of the transmission data map to the of the second layer, transmit on four antennas of the transmission data map to the of ground floor, as shown in Figure 5.
B. simulation parameter setting
The concrete setting such as the table 2 of the link level parameter of emulation of the present invention:
| Uplink transmission mode | Open-Loop Spatial Multiplexing |
| Antenna configurations | ????4×4 |
| Channel model | ????SCM-C(3km/h) |
| Resource block assignments | Six Resource Block of each user |
| Layer exchanged form | Modulation symbol level is timeslot-level |
| Modulation coding mode | ????1/3+16QAM |
| Channel estimating | Ideal communication channel |
| System bandwidth | ????10MHz |
| The Turbo code cycle- |
10 times |
| The non-equilibrium gain of antenna (AGI) | ????0dB |
| Detection algorithm | ????MMSE |
| The |
2 |
| ????HARQ | The redundant merging |
| Maximum retransmission | ????3 |
The C simulation result
When adopting the transport layer exchanged form of modulation symbol level, the layer exchanged form of emulation comparison HARQ-ACK space binding, there is not the size of the layer exchanged form user throughput under different signal to noise ratios that does not have layer exchanged form and the present invention's proposition of HARQ-ACK space binding, as shown in Figure 6.
When adopting timeslot-level transport layer exchanged form, the layer exchanged form of emulation comparison HARQ-ACK space binding, there is not the size of the layer exchanged form user throughput under different signal to noise ratios that does not have layer exchanged form and the present invention's proposition of HARQ-ACK space binding, as shown in Figure 7.
Show by simulation result, layer exchange that bind in the HARQ-ACK space and the layer that do not add that does not have the HARQ-ACK space to bind exchange, user's throughput is approaching substantially under different signal to noise ratios, and this explanation layer exchange improves to user performance under the situation that reduces feedback quantity.Simultaneously, the present invention proposes layer exchange combined with the re-transmission mode, in different retransmission processes, use the method for different layers exchange copy, can obtain certain space diversity, guarantee the correctness of data retransmission, improve user's peak rate and higher spectrum efficiency.
In addition, the layer switching method that the present invention proposes is a static configuration, only need feed back 1 bit when retransmitting simultaneously, does not increase complexity and feedback quantity, and performance also has certain raising simultaneously.
Claims (5)
1. the layer switching method of up SU-MIMO among the LTE-A comprises the steps:
(1) according to the code word and the transport layer of transmitting terminal transmission, will be code word, be mapped on one or more transport layer through the complex value modulation symbol of scrambling and modulation;
(2) data on all transport layers are carried out the exchange of each transport layer according to modulation symbol level or SC-FDMA symbol level or timeslot-level mode, again the data map of each transport layer is transmitted to different virtual-antennas, finished the layer exchange process that the user is transmitted data;
(3) will combine with the re-transmission mode through the data of layer exchange, when user's New Development error in data transmits, utilize mixed automatic retransmission mechanism, when retransmitting for the first time, the ground floor data that to transmit last time resend on second transport layer, launch by second antenna; The second layer data that to transmit last time resend on first transport layer, launch by first antenna.
2. layer mapping method according to claim 1, wherein step (1) is described will be code word through the complex value modulation symbol of scrambling and modulation, be mapped on one or more transport layer, be that the complex value modulation symbol in each code word is mapped on one or more layer, what be about to code word q duplicates modulation symbol d
(q)(0) ..., d
(0)(M
Symb (q)-1) is mapped to a layer x (i)=[x
(0)(i) ..x
(υ-1)(i)]
TOn,
υ presentation layer number wherein, M
Symb LayerIt is the modulation symbol number in each layer.
3. layer mapping method according to claim 1, the modulation symbol level transport layer exchange and the transfer of data that relate to of step (2) wherein, be in a subframe, earlier with first transport layer data and second transport layer data exchange, again first transport layer data is mapped on first antenna and transmits, second transport layer data is mapped on second antenna transmits.
4. layer mapping method according to claim 1, the SC-FDMA symbol level transport layer exchange and the transfer of data that relate to of step (2) wherein, be in a subframe, earlier with first transport layer data and second transport layer data exchange, again first transport layer data is mapped on first antenna and transmits, second transport layer data is mapped on second antenna transmits.
5. layer mapping method according to claim 1, the exchange of timeslot-level transport layer and the transfer of data that relate to of step (2) wherein, be in a subframe, earlier with first transport layer data and second transport layer data exchange, again first transport layer data is mapped on first antenna and transmits, second transport layer data is mapped on second antenna transmits.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102281086A (en) * | 2010-06-10 | 2011-12-14 | 华为技术有限公司 | Transmission method for reference signal and device |
| CN106575985A (en) * | 2014-08-30 | 2017-04-19 | 华为技术有限公司 | Data processing apparatus and data processing method |
| CN107302422A (en) * | 2016-04-13 | 2017-10-27 | 电信科学技术研究院 | The data repeating method and equipment of a kind of multithread space division multiplexing |
| US10615916B2 (en) | 2018-04-06 | 2020-04-07 | At&T Intellectual Property I, L.P. | Retransmission of failed transport blocks for 5G or other next generation network |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101272364B (en) * | 2008-05-05 | 2012-09-05 | 中兴通讯股份有限公司 | Precoding indication method and device and control method based on MU-MIMO |
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2009
- 2009-09-04 CN CN2009100237923A patent/CN101692620B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102281086A (en) * | 2010-06-10 | 2011-12-14 | 华为技术有限公司 | Transmission method for reference signal and device |
| CN106575985A (en) * | 2014-08-30 | 2017-04-19 | 华为技术有限公司 | Data processing apparatus and data processing method |
| US10367560B2 (en) | 2014-08-30 | 2019-07-30 | Huawei Technologies Co., Ltd. | Data processing apparatus and data processing method |
| CN107302422A (en) * | 2016-04-13 | 2017-10-27 | 电信科学技术研究院 | The data repeating method and equipment of a kind of multithread space division multiplexing |
| US10615916B2 (en) | 2018-04-06 | 2020-04-07 | At&T Intellectual Property I, L.P. | Retransmission of failed transport blocks for 5G or other next generation network |
| US11206111B2 (en) | 2018-04-06 | 2021-12-21 | At&T Intellectual Property I, L.P. | Retransmission of failed transport blocks for 5G or other next generation network |
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