CN102056280B - Method and device for dispatching base station of TDD LTE (Time Division Duplex Long Term Evolution) system - Google Patents

Method and device for dispatching base station of TDD LTE (Time Division Duplex Long Term Evolution) system Download PDF

Info

Publication number
CN102056280B
CN102056280B CN 200910235963 CN200910235963A CN102056280B CN 102056280 B CN102056280 B CN 102056280B CN 200910235963 CN200910235963 CN 200910235963 CN 200910235963 A CN200910235963 A CN 200910235963A CN 102056280 B CN102056280 B CN 102056280B
Authority
CN
China
Prior art keywords
constantly
cqi
transmission rate
nominal transmission
value
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.)
Active
Application number
CN 200910235963
Other languages
Chinese (zh)
Other versions
CN102056280A (en
Inventor
刘晓峰
沈嘉
徐菲
魏贵明
万屹
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Spreadtrum Communications Shanghai Co Ltd
Research Institute of Telecommunications Transmission Ministry of Industry and Information Technology
Original Assignee
Research Institute of Telecommunications Transmission Ministry of Industry and Information Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Research Institute of Telecommunications Transmission Ministry of Industry and Information Technology filed Critical Research Institute of Telecommunications Transmission Ministry of Industry and Information Technology
Priority to CN 200910235963 priority Critical patent/CN102056280B/en
Publication of CN102056280A publication Critical patent/CN102056280A/en
Application granted granted Critical
Publication of CN102056280B publication Critical patent/CN102056280B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Mobile Radio Communication Systems (AREA)

Abstract

The invention relates to a method and device for dispatching a base station of a TDD LTE (Time Division Duplex Long Term Evolution) system. The method comprises the following steps of: (1) feeding back a precoding matrix index (PMI) and a channel quality indicator (CQI) at a t+1 moment to a base station side; (2) estimating a precoding matrix of the t+1 moment by the base station, judging whethera determinant value of the difference of precoding matrixes of the t+1 moment and the t moment is smaller than a preset threshold value or not and whether a coding matrix of the t+1 moment is equal to that of the t moment or not, if so, executing a step (3), and if not, determining that the nominal transmission rate of the t+1 moment of user equipment is a nominal transmission rate corresponding to the value of the channel quality indicator of the t+1 time; and (3) changing the nominal transmission rate of the user equipment at the moment according to the variation trend of the value of the channel quality indicator. The device comprises a feedback module, an estimating and judging module and a processing module. In the invention, the CQI, the PMI and the CSI (Channel State Information) are comprehensively considered so as to preferably improve the downlink quality.

Description

Base-station scheduling method and the device of a kind of TDD LTE system
Technical field
The present invention relates to communication technology base station scheduling field, particularly relate to base-station scheduling method and the device of TDD LTE system.
Background technology
The aerial access technology of 3G is improved and strengthened to Long Term Evolution project (LTE:Long Term Evolution), adopts OFDM and MIMO as the sole criterion of its wireless network evolution.The peak rate of descending 100Mbit/s and up 50Mbit/s can be provided under the 20MHz spectral bandwidth.Improved the performance of Cell Edge User, improved cell capacity and reduce system delay.LTE has defined LTE FDD (Frequency Division Duplexing) Frequency Division Duplexing (FDD) and LTE TDD (TimeDivision Duplexing) time division duplex dual mode simultaneously.
The channel model of LTE system is: suppose t down receiving signal constantly y t = H t V ^ t s t + n t , Y wherein tFor t receives signal, H constantly tBe channel matrix,
Figure G2009102359639D00012
Be the pre-coding matrix of transmitting terminal, s tBe to send signal, n tBe the AWGN noise of N for variance.s tTransmitted power be P t, the modulation of employing and coded system are M t
For the LTE system, subscriber equipment (UE) side feedback channel pre-coding matrix index (PMI) comes the assistant base station end to carry out the pre-coding matrix selection.The corresponding encoder matrix of a general PMI V → t ∈ V , Wherein V is PMI code book space.Be subjected to the feedback channel capacity limit, the PMI number is very limited, so the base station end is very limited according to the channel information that the UE feedback obtains.In addition, the UE side is also wanted feedback channel quality information indication (CQI), with indicating channel link-quality quality, thereby determines to give modulation and the coded system CQI of the transmission of UE side tGenerally speaking, CQI and PMI connect each other, and the CQI of different PMI correspondences often differs greatly.Therefore, how to utilize limited PMI information further to improve systematic function be a very large challenge to the base station end.
For the TDD system, base station side utilizes channel reciprocity can obtain part downlink channel condition information (CSI), supposes that base station side constantly should use pre-coding matrix to next
Figure G2009102359639D00021
Be estimated as But influenced by several factors, the channel information that base station side obtains neither be very accurate, can not directly use As
Figure G2009102359639D00024
Also need to take all factors into consideration the PMI feedback
Figure G2009102359639D00025
And CQI T+1Therefore, need a kind of combined scheduling method of taking all factors into consideration CQI, PMI, CSI.
Summary of the invention
At the defective that exists in the prior art and deficiency, the objective of the invention is to propose base-station scheduling method and the device of a kind of TDDLTE system, can take all factors into consideration CQI, PMI and CSI, improve downlink quality better, thereby promote the whole system performance.
In order to achieve the above object, the present invention proposes the base-station scheduling method of a kind of TDD LTE system, comprising:
Step 1: subscriber equipment is to base station side feedback t+1 pre-coding matrix index, CQI constantly, wherein, the corresponding encoder matrix of described pre-coding matrix index, the corresponding nominal transmission rate of the value of described CQI, wherein, t is any time;
Step 2: base station side is estimated t+1 pre-coding matrix constantly, and whether whether the determinant of judging the difference of the pre-coding matrix that pre-coding matrix that t+1 estimates constantly and t estimate constantly equal t pre-coding matrix index corresponding codes matrix constantly less than a predetermined threshold and t+1 pre-coding matrix index corresponding codes matrix constantly, if, execution in step 3; If not, described subscriber equipment t+1 nominal transmission rate constantly is the t+1 nominal transmission rate of the value correspondence of CQI constantly;
Step 3: the nominal transmission rate that changes described this moment of subscriber equipment according to the variation tendency of the value of described CQI:
If the value of described CQI is along with increase constantly becomes greatly gradually, then described subscriber equipment t+1 nominal transmission rate constantly is greater than the nominal transmission rate of the value correspondence of t+1 moment CQI;
If the value of described CQI is along with increase constantly diminishes gradually, then described subscriber equipment t+1 nominal transmission rate constantly is less than the nominal transmission rate of the value correspondence of t+1 moment CQI.
Preferred as technique scheme, base station side utilize channel reciprocity to obtain the part downlink channel condition information to estimate t+1 pre-coding matrix constantly.
Preferred as technique scheme, if the value of described CQI is along with increase constantly becomes greatly gradually in the described step 3, described subscriber equipment t+1 nominal transmission rate constantly is: the t+1 nominal transmission rate of the value correspondence of CQI constantly deducts the poor of described determinant divided by 1;
If the value of described CQI is along with increase constantly diminishes gradually, described subscriber equipment t+1 nominal transmission rate constantly is: t+1 constantly the value correspondence of CQI nominal transmission rate divided by 1 add the above determinant and.
Preferred as technique scheme, also comprise the control base station transmitting power, be specially: if described subscriber equipment is scheduled, and the determinant of the difference of the pre-coding matrix in the t+1 moment and t pre-coding matrix constantly equals t encoder matrix constantly less than a predetermined threshold and t+1 encoder matrix constantly, and the value of described CQI is along with increase constantly becomes greatly gradually, then base-station transmitting-power be the base station maximum transmission power divided by 1 add the above determinant with.
The present invention also proposes the base station scheduling device of a kind of TDD LTE system, comprising:
Feedback module is used for subscriber equipment to base station side feedback t+1 pre-coding matrix index, CQI constantly, wherein, the corresponding encoder matrix of described pre-coding matrix index, the corresponding nominal transmission rate of the value of described CQI, wherein, t is any time;
Estimate and judge module, be used for base station side and estimate t+1 pre-coding matrix constantly, and judge whether whether the determinant of the difference of the pre-coding matrix that pre-coding matrix that t+1 estimates constantly and t estimate constantly equal t moment pre-coding matrix index corresponding codes matrix less than a predetermined threshold and t+1 pre-coding matrix index corresponding codes matrix constantly;
Processing module is used for the result that judges when described estimation and judge module for not the time, and the nominal transmission rate in the described subscriber equipment t+1 moment is the nominal transmission rate of the value correspondence of t+1 moment CQI; The result who judges when described estimation and judge module changes the nominal transmission rate in described this moment of subscriber equipment according to the variation tendency of the value of described CQI when being, is specially:
If the value of described CQI is along with increase constantly becomes greatly gradually, then described subscriber equipment t+1 nominal transmission rate constantly is greater than the nominal transmission rate of the value correspondence of t+1 moment CQI;
If the value of described CQI is along with increase constantly diminishes gradually, then described subscriber equipment t+1 nominal transmission rate constantly is less than the nominal transmission rate of the value correspondence of t+1 moment CQI.
Preferred as technique scheme, described estimation and judge module utilize channel reciprocity to obtain the part downlink channel condition information to estimate the t+1 pre-coding matrix in the moment.
Preferred as technique scheme, if the value of described CQI is along with increase constantly becomes greatly gradually in the described processing module, described subscriber equipment t+1 nominal transmission rate constantly is: the t+1 nominal transmission rate of the value correspondence of CQI constantly deducts the poor of described determinant divided by 1;
If the value of described CQI is along with increase constantly diminishes gradually, described subscriber equipment t+1 nominal transmission rate constantly is: t+1 constantly the value correspondence of CQI nominal transmission rate divided by 1 add the above determinant and.
Preferred as technique scheme, described processing module also is used for the control base station transmitting power, be specially: if described subscriber equipment is scheduled, and the determinant of the difference of the pre-coding matrix in the t+1 moment and t pre-coding matrix constantly equals t encoder matrix constantly less than a predetermined threshold and t+1 encoder matrix constantly, and the value of described CQI is along with increase constantly becomes greatly gradually, then base-station transmitting-power be the base station maximum transmission power divided by 1 add the above determinant with.
Said method and device that the present invention proposes, making the base station take all factors into consideration the part downlink channel condition information that UE side feedack and the reciprocity by channel obtain dispatches, and can also carry out the transmitted power of base station side, thereby the raising downlink quality gets a promotion the whole system performance.
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.For the person of ordinary skill in the field, from detailed description of the invention, above-mentioned and other purposes of the present invention, feature and advantage will be apparent.
Description of drawings
Fig. 1 is the schematic diagram of the preferred embodiment of the base-station scheduling method of the TDD LTE system of the present invention's proposition;
Fig. 2 is the schematic diagram of the preferred embodiment of the base station scheduling device of the TDD LTE system of the present invention's proposition.
Embodiment
As shown in Figure 1, the preferred embodiment of the base-station scheduling method of a kind of TDD LTE of the present invention system comprises:
Step 1: user equipment (UE) feeds back t+1 pre-coding matrix index PMI, the channel quality indicator CQI of (t is any time) constantly to base station side, in general, and the corresponding encoder matrix of PMI The value CQI of a CQI T+1Corresponding nominal transmission rate T T+1
Step 21: base station side is estimated t+1 pre-coding matrix constantly
Figure G2009102359639D00052
Then, order D = | V ~ t + 1 - V ~ t | , It is the t pre-coding matrix constantly that base station side is estimated;
Step 22: if D is less than a predefined predetermined threshold D Th, and V → t + 1 = V → t Be that t+1 pre-coding matrix index corresponding codes matrix constantly equals t pre-coding matrix index corresponding codes matrix constantly, come execution in step 31 or step 32 according to the variation tendency of the value of described CQI; If there is one not satisfy execution in step 4;
Step 31: if the value of described CQI is along with increase constantly becomes greatly gradually, that is: n CQI feedback satisfies CQI T+1-CQI t＞0, CQI t-CQI T-1〉=0 ..., CQI T-n+1-CQI T-n〉=0, represent that then the channel quality of this channel is become better and better, and very stable, then when dispatching, described subscriber equipment t+1 nominal transmission rate constantly just can be greater than the nominal transmission rate T of the value correspondence of t+1 moment CQI T+1
Step 32: if the value of described CQI is along with increase constantly diminishes gradually, namely n CQI feedback satisfies CQI T+1-CQI t＜0, CQI t-CQI T-1≤ 0 ..., CQI T-n+1-CQI T-n≤ 0, then when dispatching, described subscriber equipment t+1 nominal transmission rate constantly just is less than the t+1 nominal transmission rate T of the value correspondence of CQI constantly T+1
Step 4: described subscriber equipment t+1 nominal transmission rate constantly just is the t+1 nominal transmission rate of the value correspondence of CQI constantly;
Wherein, base station side is utilized channel reciprocity to obtain part downlink channel condition information CSI to estimate t+1 pre-coding matrix constantly
Figure G2009102359639D00061
Base station side can obtain t channel response H constantly to the channel estimating of ascending pilot frequency constantly by t t, by to H tCarry out the SVD decomposition and can obtain H t=UAV, t+1 pre-coding matrix constantly can be selected the conjugate transpose of V for use, namely V ~ t + 1 = V * .
More specifically, if the value of described CQI is along with increase constantly becomes greatly gradually in the described step 3, described subscriber equipment t+1 nominal transmission rate constantly is: T T+1/ (1-D);
If the value of described CQI is along with increase constantly diminishes gradually, described subscriber equipment t+1 nominal transmission rate constantly is T T+1/ (1+D).
Except control to user equipment (UE) sends the transmission rate of data, the present invention can also comprise that the control base station for the transmitting power of this user equipment (UE), is specially: if described subscriber equipment is scheduled, and satisfy D less than predetermined threshold and V → t + 1 = V → t , If satisfy CQI T+1-CQI t＞0, CQI t-CQI T-1〉=0 ..., CQI T-n+1-CQI T-n〉=0, base-station transmitting-power P then T+1=P Max/ (1+D), P wherein MaxThe base station maximum transmission power.
As shown in Figure 2, the preferred embodiment of the base station scheduling device of a kind of TDD LTE system that the present invention proposes comprises:
Feedback module 201 is used for subscriber equipment to base station side feedback t+1 pre-coding matrix index, CQI constantly, wherein, the corresponding encoder matrix of described pre-coding matrix index, the corresponding nominal transmission rate of the value of described CQI, wherein, t is any time;
Estimate and judge module 202, be used for base station side and estimate t+1 pre-coding matrix constantly, and judge whether whether the determinant of the difference of the pre-coding matrix that pre-coding matrix that t+1 estimates constantly and t estimate constantly equal t moment pre-coding matrix index corresponding codes matrix less than a predetermined threshold and t+1 pre-coding matrix index corresponding codes matrix constantly;
Processing module 203 is used for the result that judges when described estimation and judge module for not the time, and the nominal transmission rate in the described subscriber equipment t+1 moment is the nominal transmission rate of the value correspondence of t+1 moment CQI; The result who judges when described estimation and judge module changes the nominal transmission rate in described this moment of subscriber equipment when being according to the variation tendency of the value of described CQI:
If the value of described CQI is along with increase constantly becomes greatly gradually, then described subscriber equipment t+1 nominal transmission rate constantly is greater than the nominal transmission rate of the value correspondence of t+1 moment CQI;
If the value of described CQI is along with increase constantly diminishes gradually, then described subscriber equipment t+1 nominal transmission rate constantly is less than the nominal transmission rate of the value correspondence of t+1 moment CQI.
Wherein, described estimation and judge module 202 utilize channel reciprocity to obtain the part downlink channel condition information to estimate t+1 pre-coding matrix constantly.
If the value of described CQI is along with increase constantly becomes greatly gradually in the described processing module 203, described subscriber equipment t+1 nominal transmission rate constantly is: the t+1 nominal transmission rate of the value correspondence of CQI constantly deducts the poor of described determinant divided by 1;
If the value of described CQI is along with increase constantly diminishes gradually, described subscriber equipment t+1 nominal transmission rate constantly is: t+1 constantly the value correspondence of CQI nominal transmission rate divided by 1 add the above determinant and.
Described processing module 203 also is used for the control base station transmitting power, be specially: if described subscriber equipment is scheduled, and the determinant of the difference of the pre-coding matrix in the t+1 moment and t pre-coding matrix constantly equals t encoder matrix constantly less than a predetermined threshold and t+1 encoder matrix constantly, and the value of described CQI is along with increase constantly becomes greatly gradually, then base-station transmitting-power be the base station maximum transmission power divided by 1 add the above determinant with.
By above preferred embodiment as can be seen, the present invention utilizes the channel reciprocity of TDD system, when dispatching, CQI, PMI and CSI have been taken all factors into consideration, improved the control to each user device transmissions speed better, quality and the efficient of down link are provided, thereby the whole system performance is got a promotion.
Though; the present invention clearly demonstrates by above embodiment and accompanying drawing thereof; yet under the situation that does not deviate from spirit of the present invention and essence thereof; the person of ordinary skill in the field works as can make various corresponding variations and correction according to the present invention, but these corresponding variations and correction all should belong to the protection range of claim of the present invention.

Claims (8)

1. the base-station scheduling method of a TDD LTE system is characterized in that, comprising:
Step 1: subscriber equipment is to base station side feedback t+1 pre-coding matrix index, CQI constantly, wherein, the corresponding encoder matrix of described pre-coding matrix index, the corresponding nominal transmission rate of the value of described CQI, wherein, t is any time;
Step 2: base station side is utilized channel reciprocity to obtain downlink channel condition information to estimate t+1 pre-coding matrix constantly, and whether whether the determinant of judging the difference of the pre-coding matrix that pre-coding matrix that t+1 estimates constantly and t estimate constantly equal t pre-coding matrix index corresponding codes matrix constantly less than a predetermined threshold and t+1 pre-coding matrix index corresponding codes matrix constantly, if, execution in step 3; If not, described subscriber equipment t+1 nominal transmission rate constantly is the t+1 nominal transmission rate of the value correspondence of CQI constantly;
Step 3: the variation tendency according to the value of described CQI changes described subscriber equipment t+1 nominal transmission rate constantly:
If the value of described CQI is along with increase constantly becomes greatly gradually, then described subscriber equipment t+1 nominal transmission rate constantly is greater than the nominal transmission rate of the value correspondence of t+1 moment CQI;
If the value of described CQI is along with increase constantly diminishes gradually, then described subscriber equipment t+1 nominal transmission rate constantly is less than the nominal transmission rate of the value correspondence of t+1 moment CQI.
2. base-station scheduling method according to claim 1 is characterized in that, base station side is utilized channel reciprocity to obtain the part downlink channel condition information to estimate t+1 pre-coding matrix constantly.
3. base-station scheduling method according to claim 1, it is characterized in that, if the value of described CQI is along with increase constantly becomes greatly gradually in the described step 3, described subscriber equipment t+1 nominal transmission rate constantly is: the t+1 nominal transmission rate of the value correspondence of CQI constantly deducts the poor of described determinant divided by 1;
If the value of described CQI is along with increase constantly diminishes gradually, described subscriber equipment t+1 nominal transmission rate constantly is: t+1 constantly the value correspondence of CQI nominal transmission rate divided by 1 add the above determinant and.
4. base-station scheduling method according to claim 1, it is characterized in that, also comprise the control base station transmitting power, be specially: if described subscriber equipment is scheduled, and the determinant of the difference of the pre-coding matrix in the t+1 moment and t pre-coding matrix constantly equals t encoder matrix constantly less than a predetermined threshold and t+1 encoder matrix constantly, and the value of described CQI is along with increase constantly becomes greatly gradually, then base-station transmitting-power be the base station maximum transmission power divided by 1 add the above determinant with.
5. the base station scheduling device of a TDD LTE system is characterized in that, comprising:
Feedback module is used for subscriber equipment to base station side feedback t+1 pre-coding matrix index, CQI constantly, wherein, the corresponding encoder matrix of described pre-coding matrix index, the corresponding nominal transmission rate of the value of described CQI, wherein, t is any time;
Estimate and judge module, be used for base station side and utilize channel reciprocity to obtain downlink channel condition information to estimate t+1 pre-coding matrix constantly, and judge whether whether the determinant of the difference of the pre-coding matrix that pre-coding matrix that t+1 estimates constantly and t estimate constantly equal t moment pre-coding matrix index corresponding codes matrix less than a predetermined threshold and t+1 pre-coding matrix index corresponding codes matrix constantly;
Processing module is used for the result that judges when described estimation and judge module for not the time, and described subscriber equipment t+1 nominal transmission rate constantly is the nominal transmission rate of the value correspondence of t+1 moment CQI; The result who judges when described estimation and judge module changes the nominal transmission rate in the described subscriber equipment t+1 moment according to the variation tendency of the value of described CQI when being, is specially:
If the value of described CQI is along with increase constantly becomes greatly gradually, then described subscriber equipment t+1 nominal transmission rate constantly is greater than the nominal transmission rate of the value correspondence of t+1 moment CQI;
If the value of described CQI is along with increase constantly diminishes gradually, then described subscriber equipment t+1 nominal transmission rate constantly is less than the nominal transmission rate of the value correspondence of t+1 moment CQI.
6. base station scheduling device according to claim 5 is characterized in that, described estimation and judge module utilize channel reciprocity to obtain the part downlink channel condition information to estimate t+1 pre-coding matrix constantly.
7. base station scheduling device according to claim 5, it is characterized in that, if the value of described CQI is along with increase constantly becomes greatly gradually in the described processing module, described subscriber equipment t+1 nominal transmission rate constantly is: the t+1 nominal transmission rate of the value correspondence of CQI constantly deducts the poor of described determinant divided by 1;
If the value of described CQI is along with increase constantly diminishes gradually, described subscriber equipment t+1 nominal transmission rate constantly is: t+1 constantly the value correspondence of CQI nominal transmission rate divided by 1 add the above determinant and.
8. base station scheduling device according to claim 5, it is characterized in that, described processing module also is used for the control base station transmitting power, be specially: if described subscriber equipment is scheduled, and the determinant of the difference of the pre-coding matrix in the t+1 moment and t pre-coding matrix constantly equals t encoder matrix constantly less than a predetermined threshold and t+1 encoder matrix constantly, and the value of described CQI is along with increase constantly becomes greatly gradually, then base-station transmitting-power be the base station maximum transmission power divided by 1 add the above determinant with.
CN 200910235963 2009-10-30 2009-10-30 Method and device for dispatching base station of TDD LTE (Time Division Duplex Long Term Evolution) system Active CN102056280B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200910235963 CN102056280B (en) 2009-10-30 2009-10-30 Method and device for dispatching base station of TDD LTE (Time Division Duplex Long Term Evolution) system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200910235963 CN102056280B (en) 2009-10-30 2009-10-30 Method and device for dispatching base station of TDD LTE (Time Division Duplex Long Term Evolution) system

Publications (2)

Publication Number Publication Date
CN102056280A CN102056280A (en) 2011-05-11
CN102056280B true CN102056280B (en) 2013-09-04

Family

ID=43960062

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 200910235963 Active CN102056280B (en) 2009-10-30 2009-10-30 Method and device for dispatching base station of TDD LTE (Time Division Duplex Long Term Evolution) system

Country Status (1)

Country Link
CN (1) CN102056280B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019148399A1 (en) 2018-01-31 2019-08-08 华为技术有限公司 Method and apparatus for reporting channel state information (csi)
WO2020042107A1 (en) * 2018-08-30 2020-03-05 Nokia Shanghai Bell Co., Ltd. Determination of downlink channel state information in massive mimo systems

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101388704A (en) * 2008-10-16 2009-03-18 北京创毅视讯科技有限公司 Transmission method and mobile communication system when overlapping uni-cast and multi-cast services
WO2009033358A1 (en) * 2007-09-12 2009-03-19 Sharp Kabushiki Kaisha Information feedback method, system, user device, and base station based on space, time and frequency domain
CN101557280A (en) * 2008-04-11 2009-10-14 株式会社Ntt都科摩 Method and device for selecting pre-coding matrix/vector in multi-input and multi-output system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8086242B2 (en) * 2007-03-21 2011-12-27 Broadcom Corporation Method and system for adaptive allocation of feedback resources for CQI and transmit pre-coding

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009033358A1 (en) * 2007-09-12 2009-03-19 Sharp Kabushiki Kaisha Information feedback method, system, user device, and base station based on space, time and frequency domain
CN101557280A (en) * 2008-04-11 2009-10-14 株式会社Ntt都科摩 Method and device for selecting pre-coding matrix/vector in multi-input and multi-output system
CN101388704A (en) * 2008-10-16 2009-03-18 北京创毅视讯科技有限公司 Transmission method and mobile communication system when overlapping uni-cast and multi-cast services

Also Published As

Publication number Publication date
CN102056280A (en) 2011-05-11

Similar Documents

Publication Publication Date Title
US20200366448A1 (en) System and method for link adaptation for low cost user equipments
US9980260B2 (en) Data transmission method and apparatus, and user equipment
EP2374230B1 (en) Method for estimating uplink control channel quality
CN110098852B (en) CSI definition and feedback mode for coordinated multipoint transmission
US9496939B2 (en) Adaptive transmission mode switching
EP2733983B1 (en) Method and apparatus for transmitting/receiving channel state information
US8861455B2 (en) Method and system for signaling configuration of physical uplink shared channel
EP2604083B1 (en) System and method for channel state information feedback in wireless communications systems
CN102035615B (en) MIMO-based downlink data transmission method, device and system
EP3386131A1 (en) Information transmission method and device
CN102448113B (en) Method and system for sending periodical channel state information
US20160134342A1 (en) Adaptive MIMO Feasibility feedback
US10791522B2 (en) Wireless communication method and device
CN102545987B (en) Multicell self-adaption cooperative transmission method on basis of delayed feedback
CN103814598A (en) Method and apparatus for estimating channel quality information, base station and network central processing device
US9723625B2 (en) Downlink transmission in a MU-MIMO system
WO2014113171A1 (en) Channel quality indication for fallback transmission mode over new carrier type
US20100142640A1 (en) Method and system for selecting a pre-coding matrix
CN109474981B (en) Power determination method, user equipment and base station
EP2262125B1 (en) Radio communications apparatus, radio communications method, and radio communications system
CN103475455A (en) MCS (modulation and coding scheme) grade acquisition method and apparatus thereof
CN102056280B (en) Method and device for dispatching base station of TDD LTE (Time Division Duplex Long Term Evolution) system
CN106160925A (en) The method and device strengthened for the CQI of multi-user's stacking transmission
CN102056311B (en) Base station scheduling method for improving MU-MIMO performance and device
CN102291217B (en) The dynamical feedback method and system of long-term channel status information

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
ASS Succession or assignment of patent right

Owner name: ZHANXUN COMMUNICATION (SHANGHAI) CO. LTD.

Effective date: 20141015

C41 Transfer of patent application or patent right or utility model
COR Change of bibliographic data

Free format text: CORRECT: ADDRESS; FROM: 100045 XICHENG, BEIJING TO: 100191 HAIDIAN, BEIJING

TR01 Transfer of patent right

Effective date of registration: 20141015

Address after: 100191 Haidian District, North Garden Road, No. 52 Telecommunications Research Institute, block B, level 6, Beijing

Patentee after: Research Institute of Telecommunications Transmission, Ministry of Industry and Information Technology

Patentee after: Zhanxun Communication (Shanghai) Co., Ltd.

Address before: 100045 Beijing city Xicheng District Yuetan Nan Street 11

Patentee before: Research Institute of Telecommunications Transmission, Ministry of Industry and Information Technology