CN103368628B - Double-current beam forming method based on code books in TD-LTE system - Google Patents
Double-current beam forming method based on code books in TD-LTE system Download PDFInfo
- Publication number
- CN103368628B CN103368628B CN201310304092.8A CN201310304092A CN103368628B CN 103368628 B CN103368628 B CN 103368628B CN 201310304092 A CN201310304092 A CN 201310304092A CN 103368628 B CN103368628 B CN 103368628B
- Authority
- CN
- China
- Prior art keywords
- overbar
- rsqb
- lsqb
- weight
- antenna
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000011159 matrix material Substances 0.000 claims abstract description 16
- 238000012937 correction Methods 0.000 claims abstract description 15
- 238000012935 Averaging Methods 0.000 claims abstract description 4
- 125000004122 cyclic group Chemical group 0.000 claims description 9
- QLBALZYOTXGTDQ-VFFCLECNSA-N PGI2-EA Chemical compound O1\C(=C/CCCC(=O)NCCO)C[C@@H]2[C@@H](/C=C/[C@@H](O)CCCCC)[C@H](O)C[C@@H]21 QLBALZYOTXGTDQ-VFFCLECNSA-N 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000010606 normalization Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Landscapes
- Mobile Radio Communication Systems (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Provided is a double-current beam forming method based on code books in a TD-LTE system. The double-current beam forming method includes the steps of selecting TD-LTE 8 antenna code books, carrying out antenna correction compensation, computing a channel estimated value H after the antenna correction compensation according to an original channel estimated value and an up-going correction weight, judging whether user terminal antennas are transmitted in turns, if yes, judging whether the H is successfully matched, if yes, combining a matrix [H1,H2] and estimating normalized initial phases of M RB channels according to antennas, and changing the combined matrix into [H(1), H(2)], judging granularity of a figurative weight, setting the weight granularity to be m RB, if m>1, averaging channel estimated values of m RB and searching the double-current beam forming code book weight; if m=1, searching the double-current beam forming code book weight, traversing all RB and then finishing operation. According to the double-current beam forming method based on the code books in the TD-LTE system, the beam forming code book is preset on a base station side, two orthorhombic code book weights are searched according to user channel information, therefore, quick forming is achieved, and wireless performance of the TD-LTE system is improved.
Description
Technical Field
The invention belongs to the technical field of antennas, and particularly relates to a codebook-based double-current beam forming method in a TD-LTE system.
Background
In 2000, the TD-SCDMA mobile communication standard which is the leading standard in China is officially accepted by ITU and 3GPP as one of the 3G international standards, which is a major breakthrough in the technical history of telecommunication in China, the TD-LTE standard which is a subsequent evolution scheme of the TD-SCDMA standard is also favored by the mobile communication industry, and under the positive promotion of the government and related manufacturers in China, the TD-LTE-Advanced submitted in China is officially listed as the IMT-Advanced (4G) international standard through evaluation. Compared with the 3G technology, the LTE system has the following characteristics: (1) the communication rate and the spectrum efficiency are improved; the method comprises the following steps of (1) ensuring the service quality, expanding the service providing capability, providing more services with lower cost and better user experience, (3) more flexibly configuring the system bandwidth, (4) definitely proposing that the system provides an optimized condition for low-speed users and simultaneously improves the throughput of cell edge users on the basis of supporting high-speed movement.
The mimo technology is a technology for performing spatial diversity using multiple transmit and receive antennas. It uses discrete multi-antenna, which can effectively decompose the communication link into many parallel sub-channels, thus greatly increasing the capacity. In the downlink of TD-LTE, the multi-antenna transmission mode mainly includes technologies such as transmit diversity, beamforming, space-time and coding, and multi-user multiple-input multiple-output. The TD-LTE system supports rich application scenarios, and defines 9 transmission modes of downlink services to ensure that a technical scheme for performance optimization can be selected in various environments. Wherein, the transmission mode 7, the transmission mode 8 and the transmission mode 9 are beam forming modes.
The working principle of the beamforming is to generate a radiation pattern with a certain directivity by utilizing the strong correlation of a spatial channel and the interference principle of waves, so that the main lobe of the radiation pattern is self-adaptively pointed to a user, thereby improving the signal-to-noise ratio and obtaining obvious array gain. The purpose of beamforming is to expand the signal coverage, improve the edge throughput, and suppress interference. How to effectively and efficiently generate the beam forming weight to match the change of the channel so as to improve the throughput of the system, and the method becomes the unique standard for measuring the beam forming algorithm.
The LTE R9 extends beamforming to dual-stream transmission, thereby realizing the combination of beamforming and spatial multiplexing techniques. The double-current beam forming technology is applied to the condition that signal scattering bodies are sufficient, the intelligent antenna technology and the multi-input multi-output spatial multiplexing are combined, the characteristics of wide coverage, large cell capacity and small interference of the traditional single-current beam forming technology can be kept, the reliability of edge users can be improved, and meanwhile the throughput of central users of the cell can be effectively improved. A new dual-port dedicated pilot is defined in LTE R9 and new control signaling is introduced, with the antenna configuration being 8 x 2.
The calculation complexity is higher based on the method that singular value decomposition is mainly adopted for downlink beamforming of the TD-LTE system at present.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a codebook-based double-current beamforming method in a TD-LTE system, which is simple, can realize double-current beamforming, has low complexity of double-current beamforming and low information feedback between subsystems.
The technical scheme adopted for solving the technical problems comprises the following steps:
on the basis of single-stream beamforming based on a codebook, a double-stream beamforming method based on the codebook is provided, the method reduces the complexity of double-stream beamforming of a TD-LTE system relative to a common singular value decomposition method, and a beamforming codebook of a TD-LTE8 antenna is designed as follows:
wherein,
k is a natural number of 0 to 15,
vi=[1 ej2π*2*i/32ej4π*2*i/32ej6π*2*i/32]T
vj=[1 ej2π*2*j/32ej4π*2*j/32ej6π*2*j/32]T
wherein i is 0,1, …, 15; j is 0,1, …, 15.
The TD-LTE8 antenna beamforming codebook selects a total of 16 × 16 × 16.
1. Antenna correction and compensation for 8 antenna of TD-LTE systemBased on the original channel estimateCalculating the channel estimation after antenna correction compensation according to the uplink correction weightWhere n is the RB number index, kaRxThe index is an antenna index, u is a user index, i is a transmitting antenna index of the user u, and the value of i is 1 or 2; RB is a resource block;
2. and (3) judging whether the user terminal antenna is transmitted in turn, if so, turning to the step (3), and if not, turning to a single-flow weight to construct a double-flow weight state.
3. And judging whether the user channel matrix H is successfully paired, wherein H is an 8 multiplied by 1 channel matrix, if the user channel matrix H is successfully paired, turning to the step 4, and if the user channel matrix H is not successfully paired, turning to a single-stream weight to construct a double-stream weight state.
4. Combined matrix [ H1,H2]And normalizing the initial phase for the channel estimation values of M RBs according to the antennas, respectively, and the combination matrix becomes [ H ](1),H(2)];
5. Judging the granularity of the shaped weight, setting the granularity of the shaped weight as m RBs, averaging the channel estimation values of the m RBs if m is greater than 1, and searching the weight of the double-current beam-forming codebook; and if m is 1, directly searching the weight of the double-current beamforming codebook.
6. And ending after traversing all RBs.
The method has the advantages of simply and efficiently realizing the double-current beam forming of the TD-LTE system, reducing the information feedback among TD-LTE subsystems and reducing the complexity of system realization.
Drawings
Fig. 1 is a flowchart of overall processing of dual-stream beamforming based on a codebook in a TD-LTE system.
Fig. 2 is a diagram of the antenna configuration of the base station and the user terminal.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, but the present invention is not limited to these examples.
Example 1
The method for double-current beamforming based on the codebook in the TD-LTE system of the embodiment includes the following steps:
the antenna arrangement of the base station and the user terminal is as shown in fig. 2.
This embodiment processes RB number M to take a value of 8.
The beam forming design of the TD-LTE8 antenna codebook is as follows:
k is a natural number of 0 to 15,
vi=[1 ej2π*2*i/32ej4π*2*i/32ej6π*2*i/32]T
vj=[1 ej2π*2*j/32ej4π*2*j/32ej6π*2*j/32]T
wherein i is 0,1, …, 15; j is 0,1, …, 15;
the codebook selects a total of 16 × 16 × 16.
The first step is as follows: start 11, antenna calibration Compensation 12, for TPerforming antenna correction compensation on 8 antennas of the D-LTE system according to the original channel estimation valueCalculating the channel estimation after antenna correction compensation according to the uplink correction weight
Wherein n is the RB number index kaRxThe index is an antenna index, u is a user index, i is a transmitting antenna index of the user u, and the value of i is 1 or 2; RB is a resource block; (the invention adopts the processing mode consistent with the single antenna transmission at the antenna side of the user terminal)
Note: uplink correction weightThe calculation method comprises the following steps that after the average H of each subcarrier on each channel is obtained, the amplitude-phase characteristics of each subcarrier are obtained, and by taking a certain channel as a reference, the amplitude-phase inconsistency of each channel relative to the reference channel is calculated by an online correction method, so that the compensation coefficient, namely the correction weight, of each antenna channel is obtained;
the second step is that: judging whether the user terminal antenna is sent out in turn 13, if the user terminal antenna is sent out in turn, switching to the third step, and if the user terminal antenna is not sent out in turn, switching to a single-flow weight construction double-flow weight state 14;
the third step: judging whether H is successfully paired 15, if so, switching to the fourth step, and if not, switching to a single-flow weight construction double-flow weight state 16; the method for constructing the double-flow weight by the single-flow weight is as follows;
setting the weight granularity m as 1RB or setting the weight granularity m as 1RB
1. Weighted by a single streamSearch method acquisition, PMI1(I1,J1,K1);
2. Querying and searching a predetermined codebook, finding and PMI1(I1,J1,K1) Orthogonal elements, constituting a codebook set Q, assuming that there are L elements in this codebook set;
3. performing loop traversal search L times on L codebooks in a codebook set Q, and searching for i, j, k which satisfy the following formula and are recorded as PMI2(I2,J2,K2)
Wherein, when m is 1, the cyclic Loop is 1: m, when M >1, Loop ═ 1: [ M/M ], in the embodiment, the value of M is 8, and other positive integers can be adopted;
the fourth step: combined matrix [ H1, H2]17, normalizing the channel estimation values of M RBs according to the antennas respectively to obtain an initial phase, and changing the combination matrix into H(1),H(2)]18, the specific method is as follows:
1. determine the phase θ of the first antenna per RB
2. Per RB normalization by antenna 1 phase
Wherein, the cyclic Loop is 1: m;
the fifth step: judging the granularity 19 of the shaped weight, setting the granularity of the shaped weight as m RBs, if m is greater than 1, firstly averaging the channel estimation values of the m RBs (step 20), and then searching a double-current beam-shaped codebook weight 21; if m is 1, directly searching a double-current beamforming codebook weight 24, wherein the specific method is as follows;
when the weight granularity m is 1RB
1. In order to simplify the search space, the search is performed in 3 groups of 16 codebooks of i, j and k, and PMI serial numbers i, j and k satisfying the following formula are respectively searched and recorded as PMIs1(I1,J1,K1)25
Search 16 times to obtain I1Wherein index1 is 4 antennas corresponding to port 0;
search 16 times to obtain J1;
Search 16 times to obtain K1;
Wherein index2 is 4 antennas corresponding to port1, so far, PMI1(I1,J1,K1) Has already searched for;
2. querying and searching a predetermined codebook, finding and PMI1(I1,J1,K1) Orthogonal elements form a codebook set Q, and L elements are assumed in the codebook set Q;
3. circulating L codebooks in a codebook set Q, traversing and searching for L times, searching PMI serial numbers i, j and k meeting the following formula and marking as PMI2(I2,J2,K2)
When the weight granularity m >1RB
1. Channel estimation H for m RBs(i)The values are averaged and the calculation formula is as follows
Wherein jj is 1, 2, …, KaTx,KaTxFor the base station transmitting antenna index, i is the user transmitting antenna index, i takes 1 or 2, and the cyclic Loop is 1: [ M/M ]];
2. To simplify the search space, 3 sets of 16 codebooks of i, j, k are searched, and PMI numbers i, j, k 22 satisfying the following formula are searched respectively
Search 16 times to obtain I1In, index1 is 4 antennas corresponding to port 0;
search 16 times to obtain J1In, index2 is 4 antennas corresponding to port 1;
search 16 times to obtain K1;
Wherein, the cyclic Loop is 1: [ M/M ]
3. Querying and searching a predetermined codebook, finding and PMI1(I1,J1,K1) Orthogonal elements form a codebook set Q, and L elements are assumed in the codebook set Q;
4. circulating L codebooks in a codebook set Q, traversing and searching for L times, searching for i, j and k meeting the following formula, and recording the i, j and k as PMI2(I2,J2,K2)
Wherein, the cyclic Loop is 1: [ M/M ]
And a sixth step: and judging whether all RBs 23, 26 are traversed or not, and finally ending 27.
Claims (1)
1. A double-current beam forming method based on a codebook in a TD-LTE system is characterized by comprising the following steps:
selecting a TD-LTE8 antenna beamforming codebook:
k is a natural number of 0 to 15,
vi=[1 ej2π*2*i/32ej4π*2*i/32ej6π*2*i/32]T
vj=[1 ej2π*2*j/32ej4π*2*j/32ej6π*2*j/32]T
wherein i is 0,1, …, 15; j is 0,1, …, 15;
the TD-LTE8 antenna beam forming codebook selects a total of 16 × 16 × 16;
(1) performing antenna correction compensation on 8 antennas of the TD-LTE system according to the original channel estimation valueCalculating the channel estimation after antenna correction compensation according to the uplink correction weightWhere n is the RB number index, kaRxThe index is an antenna index, u is a user index, i is a transmitting antenna index of the user u, and the value of i is 1 or 2; RB is a resource block;
(2) judging whether the user terminal antenna is transmitted in turn, if so, turning to the step (3), and if not, turning to a single-flow weight to construct a double-flow weight state;
(3) judging whether the user channel matrix H is successfully paired, wherein H is an 8 multiplied by 1 channel matrix, if the user channel matrix H is successfully paired, the step (4) is carried out, and if the user channel matrix H is not successfully paired, the step is carried out, and the step is carried out, the step is;
(4) combined matrix [ H1,H2]And normalizing the initial phase for the channel estimation values of M RBs according to the antennas, respectively, and the combination matrix becomes [ H ](1),H(2)];
The specific method comprises the following steps:
a. determine the phase θ of the first antenna per RB
b. Per RB normalization by antenna 1 phase
Wherein, the cyclic Loop is 1: m;
(5) judging the granularity of the shaped weight, setting the granularity of the shaped weight as m RBs, averaging the channel estimation values of the m RBs if m is greater than 1, and searching the weight of the double-current beam-forming codebook; if m is 1, directly searching a double-current beam forming codebook weight;
when the weight granularity m is 1 RB:
a. in order to simplify the search space, the search is performed in 3 groups of 16 codebooks of i, j and k, and PMI serial numbers i, j and k satisfying the following formula are respectively searched and recorded as PMIs1(I1,J1,K1)
Search 16 times to obtain I1Wherein index1 is 4 antennas corresponding to port 0;
search 16 times to obtain J1;
Search 16 times to obtain K1;
Wherein index2 is 4 antennas corresponding to port1, so far, PMI1(I1,J1,K1) Has already searched for;
b. querying and searching a predetermined codebook, finding and PMI1(I1,J1,K1) Orthogonal elements, groupsA codebook set Q is formed, and L elements are assumed in the codebook set Q;
c. circulating L codebooks in a codebook set Q, traversing and searching for L times, searching PMI serial numbers i, j and k meeting the following formula and marking as PMI2(I2,J2,K2)
② when the weight granularity m is more than 1RB
a. Channel estimation H for m RBs(i)The values are averaged and the calculation formula is as follows
Wherein jj is 1, 2, …, KaTx,KaTxFor the base station transmitting antenna index, i is the user transmitting antenna index, i takes 1 or 2, and the cyclic Loop is 1: [ M/M ]];
b. In order to simplify the search space, 3 groups of 16 codebooks of i, j and k are searched, and PMI serial numbers i, j and k meeting the following formula are respectively searched;
search 16 times to obtain I1In, index1 is 4 antennas corresponding to port 0;
search 16 times to obtain J1In, index2 is 4 antennas corresponding to port 1;
search 16 times to obtain K1;
Wherein, the cyclic Loop is 1: [ M/M ]
c. Querying and searching a predetermined codebook, finding and PMI1(I1,J1,K1) Orthogonal elements form a codebook set Q, and L elements are assumed in the codebook set Q;
d. circulating L codebooks in a codebook set Q, traversing and searching for L times, searching for i, j and k meeting the following formula, and recording the i, j and k as PMI2(I2,J2,K2)
Wherein, the cyclic Loop is 1: [ M/M ];
(6) and ending after traversing all RBs.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201310304092.8A CN103368628B (en) | 2013-07-18 | 2013-07-18 | Double-current beam forming method based on code books in TD-LTE system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201310304092.8A CN103368628B (en) | 2013-07-18 | 2013-07-18 | Double-current beam forming method based on code books in TD-LTE system |
Publications (2)
Publication Number | Publication Date |
---|---|
CN103368628A CN103368628A (en) | 2013-10-23 |
CN103368628B true CN103368628B (en) | 2017-05-03 |
Family
ID=49369261
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201310304092.8A Expired - Fee Related CN103368628B (en) | 2013-07-18 | 2013-07-18 | Double-current beam forming method based on code books in TD-LTE system |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN103368628B (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106571860A (en) * | 2015-10-10 | 2017-04-19 | 中兴通讯股份有限公司 | Uplink data channel multi-antenna combining method and apparatus |
CN107872262B (en) * | 2016-09-19 | 2021-11-09 | 中兴通讯股份有限公司 | Method and device for improving data forming gain, base station and communication system |
CN106712824A (en) * | 2016-12-29 | 2017-05-24 | 陕西尚品信息科技有限公司 | Interference processing method based on MIMO self-organizing network |
CN111226397B (en) * | 2017-11-10 | 2022-05-17 | 上海诺基亚贝尔股份有限公司 | Method and device for digital predistortion processing in beamforming |
CN111385008B (en) * | 2018-12-29 | 2022-09-30 | 中兴通讯股份有限公司 | Beamforming method, base station and computer readable storage medium |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101594176A (en) * | 2008-05-27 | 2009-12-02 | 大唐移动通信设备有限公司 | The equipment of dual-layer beam forming method, device and the transmission of support dual-layer beam forming |
WO2011091588A1 (en) * | 2010-01-27 | 2011-08-04 | 中兴通讯股份有限公司 | Weight obtaining method and apparatus for dual-current multiple input multiple output beamforming, data transmission method and apparatus for dual-current multiple input multiple output beamforming |
CN102595385A (en) * | 2012-03-02 | 2012-07-18 | 电信科学技术研究院 | Downlink transmission method and device |
WO2012109784A1 (en) * | 2011-02-14 | 2012-08-23 | 富士通株式会社 | Mobile terminal, femto base station, macro base station, communication system and communication method |
-
2013
- 2013-07-18 CN CN201310304092.8A patent/CN103368628B/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101594176A (en) * | 2008-05-27 | 2009-12-02 | 大唐移动通信设备有限公司 | The equipment of dual-layer beam forming method, device and the transmission of support dual-layer beam forming |
WO2011091588A1 (en) * | 2010-01-27 | 2011-08-04 | 中兴通讯股份有限公司 | Weight obtaining method and apparatus for dual-current multiple input multiple output beamforming, data transmission method and apparatus for dual-current multiple input multiple output beamforming |
WO2012109784A1 (en) * | 2011-02-14 | 2012-08-23 | 富士通株式会社 | Mobile terminal, femto base station, macro base station, communication system and communication method |
CN102595385A (en) * | 2012-03-02 | 2012-07-18 | 电信科学技术研究院 | Downlink transmission method and device |
Non-Patent Citations (3)
Title |
---|
LTE-Advanced***中双流波束赋形方案分析;郑斌等;《中国电子科学研究学报》;20101220;第5卷(第6期);全文 * |
LTE***中波束赋形技术的研究;陈柏宇;《中国优秀硕士学位论文全文数据库 信息科技辑》;20130315(第3期);全文 * |
TD-LTE***下行多用户波束赋形技术;何桂龙;《中国优秀硕士学位论文全文数据库 信息科技辑》;20110315(第3期);全文 * |
Also Published As
Publication number | Publication date |
---|---|
CN103368628A (en) | 2013-10-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US11451274B2 (en) | Adaptive downlink multi user multiple input multiple output (MU-MIMO)precoding using uplink signal subspace tracking for active antenna systems AAS | |
US9325390B2 (en) | Wireless communications system and precoding method | |
US8295213B2 (en) | Method, system and apparatus for uplink space transmission of TDD system | |
CN102571301B (en) | Dual-codebook-based multi-user adaptive feedback method | |
CN104871437B (en) | Channel reciprocity compensation method and device in FDD system | |
CN112751592B (en) | Method and communication device for reporting channel state information | |
CN104396170A (en) | Method and apparatus for feedback in 3d mimo wireless systems | |
CN105723627A (en) | Methods and a device for multi-resolution precoding matrix indicator feedback | |
Kudo et al. | A channel state information feedback method for massive MIMO-OFDM | |
US9270350B2 (en) | OFDM communication system, method and device for transceiving signal | |
JP2011518466A (en) | Signal transmission method for reducing feedback overhead and feedback information transmission method therefor | |
JP6208370B2 (en) | Channel information feedback method, base station and terminal | |
CN103368628B (en) | Double-current beam forming method based on code books in TD-LTE system | |
CN103716263B (en) | Based on the parallel efficient pilot frequency system offset in large-scale multi-antenna system | |
Slock | Location aided wireless communications | |
CN105075139A (en) | Method for transmitting signal in multi-antenna wireless communication system and apparatus for same | |
US8615049B2 (en) | Method and apparatus for controlling co-channel interference in a wireless communication system | |
JP2020504465A (en) | Advanced CSI reporting for hybrid class A / B operation | |
EP3602829A1 (en) | Codebook implementation in a user equipment and base station system | |
US9088315B2 (en) | Radio communications system and method performed therein | |
Ratajczak et al. | Two-way relaying for 5G systems: Comparison of network coding and MIMO techniques | |
CN102291201B (en) | Low-complexity codebook searching method of dual-codebook-oriented structure | |
CN101964696A (en) | Pre-coding matrix selecting method and system for space division multiplexing | |
CN103188006B (en) | A kind of downlink collaboration multipoint transmission method and system | |
CN103312393B (en) | A kind of uplink coordinated multipoint iterations and system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170503 Termination date: 20180718 |
|
CF01 | Termination of patent right due to non-payment of annual fee |