WO2012096532A3 - 무선 통신 시스템에서 채널상태정보 측정 자원 설정 방법 및 장치 - Google Patents

무선 통신 시스템에서 채널상태정보 측정 자원 설정 방법 및 장치 Download PDF

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Publication number
WO2012096532A3
WO2012096532A3 PCT/KR2012/000303 KR2012000303W WO2012096532A3 WO 2012096532 A3 WO2012096532 A3 WO 2012096532A3 KR 2012000303 W KR2012000303 W KR 2012000303W WO 2012096532 A3 WO2012096532 A3 WO 2012096532A3
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WO
WIPO (PCT)
Prior art keywords
wireless communication
communication system
status information
channel status
information measuring
Prior art date
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Ceased
Application number
PCT/KR2012/000303
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English (en)
French (fr)
Other versions
WO2012096532A2 (ko
Inventor
서한별
김기준
김병훈
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LG Electronics Inc
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LG Electronics Inc
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Publication date
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Priority to US13/979,303 priority Critical patent/US9264915B2/en
Priority to EP12734658.3A priority patent/EP2665201A4/en
Priority to KR1020137017563A priority patent/KR101868626B1/ko
Publication of WO2012096532A2 publication Critical patent/WO2012096532A2/ko
Publication of WO2012096532A3 publication Critical patent/WO2012096532A3/ko
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/345—Interference values
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

본 발명은 무선 통신 시스템에 대한 것으로, 보다 상세하게는 무선 통신 시스템에서 채널상태정보 측정 자원을 설정하는 방법 및 장치가 개시된다. 본 발명에 따르면 채널상태정보 측정에 대한 가상 레퍼런스 자원을 설정함으로써, 보다 정확하고 효율적으로 채널상태정보를 송수신하는 방안이 제공된다.
PCT/KR2012/000303 2011-01-14 2012-01-12 무선 통신 시스템에서 채널상태정보 측정 자원 설정 방법 및 장치 Ceased WO2012096532A2 (ko)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US13/979,303 US9264915B2 (en) 2011-01-14 2012-01-12 Method and device for setting channel status information measuring resource in a wireless communication system
EP12734658.3A EP2665201A4 (en) 2011-01-14 2012-01-12 Method and device for setting channel status information measuring resource in a wireless communication system
KR1020137017563A KR101868626B1 (ko) 2011-01-14 2012-01-12 무선 통신 시스템에서 채널상태정보 측정 자원 설정 방법 및 장치

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US201161432596P 2011-01-14 2011-01-14
US61/432,596 2011-01-14
US201161505090P 2011-07-06 2011-07-06
US61/505,090 2011-07-06
US201161524741P 2011-08-17 2011-08-17
US61/524,741 2011-08-17

Publications (2)

Publication Number Publication Date
WO2012096532A2 WO2012096532A2 (ko) 2012-07-19
WO2012096532A3 true WO2012096532A3 (ko) 2012-09-20

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PCT/KR2012/000303 Ceased WO2012096532A2 (ko) 2011-01-14 2012-01-12 무선 통신 시스템에서 채널상태정보 측정 자원 설정 방법 및 장치

Country Status (4)

Country Link
US (1) US9264915B2 (ko)
EP (1) EP2665201A4 (ko)
KR (1) KR101868626B1 (ko)
WO (1) WO2012096532A2 (ko)

Families Citing this family (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012099412A2 (ko) * 2011-01-23 2012-07-26 엘지전자 주식회사 무선 통신 시스템에서 중계기의 상향링크 신호 전송 방법 및 장치
EP2698928A4 (en) * 2011-04-13 2014-11-19 Lg Electronics Inc TRANSMITTING-RECEIVING METHOD OF CHANNEL STATE INFORMATION AND TRANSCEIVER
US10085164B2 (en) * 2011-04-28 2018-09-25 Qualcomm Incorporated System and method for managing invalid reference subframes for channel state information feedback
CN102891710B (zh) * 2011-07-20 2015-12-02 华为技术有限公司 一种获取信道状态信息的方法及装置
CN102932112B (zh) * 2011-08-11 2015-11-25 华为技术有限公司 一种多天线传输的方法及装置
WO2013055152A1 (en) * 2011-10-12 2013-04-18 Samsung Electronics Co., Ltd. Method and apparatus for transmitting and receiving feedback information in a mobile communication system
KR101890419B1 (ko) * 2012-01-16 2018-08-21 삼성전자주식회사 기준신호를 송수신하기 위한 방법 및 장치
US20130242766A1 (en) * 2012-03-14 2013-09-19 Qualcomm Incorporated Pre-sib2 channel estimation and signal processing in the presence of mbsfn for lte
CN110365382B (zh) * 2012-05-10 2022-06-21 中兴通讯股份有限公司 Csi反馈信令的指示配置方法及基站
DK2847918T3 (en) * 2012-05-10 2019-01-28 Ericsson Telefon Ab L M Methods and devices for CSI reporting
US9204317B2 (en) 2012-05-11 2015-12-01 Telefonaktiebolaget L M Ericsson (Publ) Methods and arrangements for CSI reporting
WO2013183946A1 (ko) * 2012-06-05 2013-12-12 엘지전자 주식회사 채널 상태 정보를 보고하는 방법 및 장치
CN103858398A (zh) * 2012-08-01 2014-06-11 华为技术有限公司 数据解调方法与系统、以及用户设备
US9839009B2 (en) 2012-08-03 2017-12-05 Qualcomm Incorporated Methods and apparatus for processing control and/or shared channels in long term evolution (LTE)
US9137810B2 (en) 2012-09-07 2015-09-15 Kt Corporation Transmitting configuration information of interference measurement resource, and measuring interference
KR101972945B1 (ko) * 2012-09-18 2019-04-29 삼성전자 주식회사 무선 통신 시스템에서 채널 상태 정보 송수신 방법 및 장치
US9609537B2 (en) * 2012-09-28 2017-03-28 Qualcomm Incorporated Randomization procedure for assigning interference measurement resources in wireless communication
WO2014058170A1 (ko) * 2012-10-09 2014-04-17 주식회사 케이티 다운링크에서의 간섭을 측정하는 방법 및 그 장치
KR20140078236A (ko) * 2012-12-17 2014-06-25 주식회사 팬택 다중 안테나 시스템에서 자원 요소의 설정 또는 전송장치 및 방법
WO2014104854A1 (ko) * 2012-12-30 2014-07-03 엘지전자 주식회사 다중 셀 무선 통신 시스템에서 무선 자원 정보 공유 방법 및 이를 위한 장치
CN103944668B (zh) * 2013-01-18 2019-05-10 北京三星通信技术研究有限公司 一种处理灵活子帧的上下行传输的方法和设备
WO2014110816A1 (zh) * 2013-01-18 2014-07-24 华为技术有限公司 测量方法、小区测量方法、装置及通信节点
EP2962485B1 (en) * 2013-03-01 2019-08-21 Intel IP Corporation Wireless local area network (wlan) traffic offloading
EP2963967B1 (en) * 2013-04-09 2021-09-22 Huawei Technologies Co., Ltd. Measurement method, base station and user equipment
US20160080963A1 (en) * 2013-05-08 2016-03-17 Interdigital Patent Holdings, Inc. Methods, systems and apparatuses for network assisted interference cancellation and suppression in long-term evolution (lte) systems
CN105493433B (zh) * 2013-08-29 2019-01-01 Lg 电子株式会社 在支持机器型通信的无线接入系统中发送信道状态信息的方法和装置
WO2015163642A1 (ko) * 2014-04-25 2015-10-29 엘지전자 주식회사 채널 상태 보고를 위한 방법 및 이를 위한 장치
EP3219140B1 (en) * 2014-11-14 2020-07-08 Interdigital Patent Holdings, Inc. Methods and procedures for channel measurements and reporting mechanisms
US9867175B2 (en) * 2014-12-03 2018-01-09 Qualcomm Incorporated Transmit antenna diversity scheme
CN106301509B (zh) * 2015-05-21 2020-01-17 电信科学技术研究院 一种信道状态信息反馈方法和终端
US10979924B2 (en) 2016-03-30 2021-04-13 Idac Holdings, Inc. Systems and methods for reference signal measurements in wireless systems
CN110476449B (zh) 2017-03-24 2023-02-21 瑞典爱立信有限公司 用于amm测量的csi-rs
US10833897B2 (en) 2017-05-04 2020-11-10 At&T Intellectual Property I, L.P. Employing modulation layer mapping to improve performance of MIMO communication systems
US11245444B2 (en) * 2017-06-16 2022-02-08 Telefonaktiebolaget Lm Ericsson (Publ) Channel state information for reference signals in a wireless communication system
WO2021162517A1 (ko) * 2020-02-13 2021-08-19 엘지전자 주식회사 무선 통신 시스템에서 채널 상태 정보 송수신 방법 및 장치
CN118044164A (zh) * 2021-09-27 2024-05-14 现代自动车株式会社 通信系统中的资源分配方法和装置

Family Cites Families (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7120431B1 (en) * 1999-02-12 2006-10-10 Lucent Technologies Inc. System and method for adjusting antenna radiation in a wireless network
KR100742456B1 (ko) * 2003-02-17 2007-07-25 교세라 가부시키가이샤 무선 장치
DE602005004619T2 (de) * 2005-11-04 2009-04-30 Alcatel Lucent Zuweisung von Frequenzen mit begrenzter Leistung zur Verbesserung von Interzellinterferenzen
US8009574B2 (en) * 2006-09-25 2011-08-30 Lantiq Deutschland Gmbh Power level settings for transmission lines
KR101349830B1 (ko) * 2008-03-05 2014-01-09 엘지전자 주식회사 간섭 측정 방법
EP2945451B1 (en) * 2008-04-04 2016-06-08 Telefonaktiebolaget LM Ericsson (publ) Interference reduction in a communication network by scheduling and link adaptation
US7760702B2 (en) * 2008-08-29 2010-07-20 Motorola, Inc. Automatic repeat request (ARQ) protocol for a multihop cooperative relay communication network
US8185057B2 (en) * 2008-12-30 2012-05-22 Telefonaktiebolaget L M Ericsson (Publ) Uplink channel quality feedback reduction in a mobile communication system
KR101614085B1 (ko) * 2008-12-31 2016-04-20 인텔렉추얼디스커버리 주식회사 Ｏｆｄｍａ ｔｄｄ 시스템에서의 상향링크 전력 제어 방법
CN102356577B (zh) * 2009-03-16 2017-06-06 太阳专利信托公司 无线电接收装置、无线电发送装置和无线电通信方法
BR112012003360A2 (pt) * 2009-08-14 2017-02-14 Nokia Corp formas flexíveis para configurações do subquadro de backhaul de downlink / uplink em um sistema de retransmissão.
JP2011049829A (ja) * 2009-08-27 2011-03-10 Kyocera Corp 無線基地局、無線端末、無線中継局、無線基地局システム、無線通信システムおよび無線通信方法
US8942192B2 (en) * 2009-09-15 2015-01-27 Qualcomm Incorporated Methods and apparatus for subframe interlacing in heterogeneous networks
US20110085519A1 (en) * 2009-10-09 2011-04-14 Nokia Corporation Spreading Code Allocation
US8942171B2 (en) * 2009-11-30 2015-01-27 Optis Wireless Technology, Llc Technique for performing physical layer measurements
US8824384B2 (en) * 2009-12-14 2014-09-02 Samsung Electronics Co., Ltd. Systems and methods for transmitting channel quality information in wireless communication systems
CA2790291C (en) * 2010-01-20 2017-08-15 Telefonaktiebolaget L M Ericsson (Publ) Antenna port mapping method and device for demodulation reference signals
KR101604702B1 (ko) * 2010-01-25 2016-03-18 엘지전자 주식회사 분산 안테나 시스템에서의 신호 송수신 방법 및 장치
EP2534876B1 (en) * 2010-02-10 2018-08-15 Beijing Xiaomi Mobile Software Co., Ltd. Method and device for data processing in a wireless network
KR20110095823A (ko) * 2010-02-19 2011-08-25 엘지전자 주식회사 무선 통신 시스템에서 복수의 레이어들을 복수의 안테나 포트들에 맵핑하는 방법 및 장치
CN101834629B (zh) * 2010-04-06 2014-10-22 中兴通讯股份有限公司 一种指示传输参数的方法及系统
EP2579668B1 (en) * 2010-05-24 2016-10-26 NTT DoCoMo, Inc. Mobile station, radio base station, and communications control method
WO2011150549A1 (en) * 2010-06-01 2011-12-08 Nokia Corporation Apparatus and method for selection of beam groups and subset of beams in communication system
KR101712380B1 (ko) * 2010-06-14 2017-03-06 삼성전자주식회사 인지적 간섭 제어 방법 및 장치
US9173205B2 (en) * 2010-08-13 2015-10-27 Lg Electronics Inc. Method and base station for transmitting downlink signal and method and equipment for receiving downlink signal
US8706041B2 (en) * 2010-09-16 2014-04-22 Dynamic Invention Llc Multiple-input, multiple-output cognitive radio
KR101901927B1 (ko) * 2010-09-28 2018-09-27 엘지전자 주식회사 무선 통신 시스템에서 셀간 간섭 조정 방법 및 장치
US9014024B2 (en) * 2010-10-04 2015-04-21 Qualcomm Incorporated Devices for determining a reference subframe and determining a mode
KR101780503B1 (ko) * 2010-10-06 2017-09-21 언와이어드 플래넷 인터내셔널 리미티드 데이터 송수신 방법 및 장치
US8886190B2 (en) * 2010-10-08 2014-11-11 Qualcomm Incorporated Method and apparatus for measuring cells in the presence of interference
EP2637332A4 (en) * 2010-11-05 2017-11-15 Samsung Electronics Co., Ltd Method and device for activating secondary carrier in wireless communication system for using carrier aggregation technique
US8837301B2 (en) * 2010-11-08 2014-09-16 Motorola Mobility Llc Interference measurements in enhanced inter-cell interference coordination capable wireless terminals
CN102792747B (zh) * 2010-11-11 2017-07-07 联发科技股份有限公司 用来在通信系统内配置信道状态信息测量的方法与通信装置
CN107046677B (zh) * 2010-12-14 2020-10-09 Lg 电子株式会社 用于测量ue的位置的技术
CA2823749C (en) * 2011-01-07 2016-07-12 Nokia Siemens Networks Oy Channel quality indicator reporting
EP2475127A1 (en) * 2011-01-10 2012-07-11 Panasonic Corporation Channel state information reporting for component carriers for which no channel state information was calculated
CN102907131B (zh) * 2011-01-10 2016-08-10 联发科技股份有限公司 决定实施信道状态信息测量的时间的方法及通讯装置

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
"3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures (Release 10)", 3GPP TS 36.213 V10.0.1, December 2010 (2010-12-01), XP050462385 *
"CSI measurement reference", 3GPP TSG RAN WG1 MEETING #63, R1-106361, 19 November 2010 (2010-11-19), XP050489736 *
"Details of restricted CSI measurements", 3GPP TSG RAN WG1 MEETING #63, 18 November 2010 (2010-11-18), XP050468215 *
"Remaining issues on eICIC for Rel-10", 3GPP TSG RAN WG1 MEETING #63,R1-106184, 19 November 2010 (2010-11-19), XP050489634 *
"Signaling and UE Behaviors for Resource-Specific CSI Measurements", 3GPP TSG RAN WG1 MEETING #63, R1-105852, 19 November 2010 (2010-11-19), XP050489419 *

Also Published As

Publication number Publication date
EP2665201A4 (en) 2017-05-17
WO2012096532A2 (ko) 2012-07-19
KR101868626B1 (ko) 2018-06-18
KR20140029365A (ko) 2014-03-10
EP2665201A2 (en) 2013-11-20
US9264915B2 (en) 2016-02-16
US20130301465A1 (en) 2013-11-14

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