IN2014CN01786A - - Google Patents

Download PDF

Info

Publication number
IN2014CN01786A
IN2014CN01786A IN1786CHN2014A IN2014CN01786A IN 2014CN01786 A IN2014CN01786 A IN 2014CN01786A IN 1786CHN2014 A IN1786CHN2014 A IN 1786CHN2014A IN 2014CN01786 A IN2014CN01786 A IN 2014CN01786A
Authority
IN
India
Prior art keywords
time offset
information regarding
wireless communication
antennas
predetermined threshold
Prior art date
Application number
Inventor
Tao Luo
Stefan Geirhofer
Peter Gaal
Original Assignee
Qualcomm Inc
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 Qualcomm Inc filed Critical Qualcomm Inc
Publication of IN2014CN01786A publication Critical patent/IN2014CN01786A/en

Links

Classifications

    • 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
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • 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
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/10—Monitoring; Testing of transmitters
    • H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
    • H04B17/104—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof of other parameters, e.g. DC offset, delay or propagation times
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/24—Monitoring; Testing of receivers with feedback of measurements to the transmitter
    • 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
    • H04B7/0667—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 delayed versions of same signal
    • H04B7/0671—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 delayed versions of same signal using different delays between antennas
    • 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
    • H04B7/0667—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 delayed versions of same signal
    • H04B7/0673—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 delayed versions of same signal using feedback from receiving side
    • 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
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • 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 signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • 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
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • 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
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • 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
    • H04B7/0665—Feed forward of transmit weights to the receiver

Abstract

A method (800) for wireless communication is provided which includes receiving first and second signals transmitted from first and second antennas respectively (802) determining a time offset between the first and second antennas based on the first and second signals (804) and reporting information regarding the time offset including information regarding the time offset as being above or below a predetermined threshold (806). Another method (900) for wireless communication is provided which includes generating channel state information feedback based on an assumption that the time offset is being compensated at a transmitter side. Yet another method (1000) for wireless communication is provided which includes receiving information regarding a time offset between multiple transmit antennas including information regarding the time offset as being above or below a predetermined threshold (1002) and adapting downlink transmissions to account for the time offset (1004).
IN1786CHN2014 2011-10-03 2012-10-02 IN2014CN01786A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US201161542644P 2011-10-03 2011-10-03
US13/633,103 US9209950B2 (en) 2011-10-03 2012-10-01 Antenna time offset in multiple-input-multiple-output and coordinated multipoint transmissions
PCT/US2012/058471 WO2013052491A2 (en) 2011-10-03 2012-10-02 Antenna time offset in multiple-input-multiple-output and coordinated multipoint transmissions

Publications (1)

Publication Number Publication Date
IN2014CN01786A true IN2014CN01786A (en) 2015-05-29

Family

ID=47992543

Family Applications (1)

Application Number Title Priority Date Filing Date
IN1786CHN2014 IN2014CN01786A (en) 2011-10-03 2012-10-02

Country Status (7)

Country Link
US (2) US9209950B2 (en)
EP (2) EP2879317A1 (en)
JP (2) JP6042439B2 (en)
KR (1) KR101552268B1 (en)
CN (1) CN103875198B (en)
IN (1) IN2014CN01786A (en)
WO (1) WO2013052491A2 (en)

Families Citing this family (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8249540B1 (en) 2008-08-07 2012-08-21 Hypres, Inc. Two stage radio frequency interference cancellation system and method
US9209950B2 (en) 2011-10-03 2015-12-08 Qualcomm Incorporated Antenna time offset in multiple-input-multiple-output and coordinated multipoint transmissions
EP2750439A4 (en) * 2011-10-14 2015-04-29 Ntt Docomo Inc Wireless communication system, wireless base station device, user terminal, and wireless communication method
BR112014010783A2 (en) 2011-11-04 2017-06-13 Intel Corp timing synchronization for downlink (dl) transmissions in coordinated multipoint systems (comp)
US8934326B2 (en) * 2011-11-07 2015-01-13 Qualcomm Incorporated Reference signal detection
US9008712B2 (en) * 2012-01-05 2015-04-14 Industrial Technology Research Institute Method and communication device for handling time offsets between communication device and transmission points
JP5943094B2 (en) * 2012-01-30 2016-06-29 富士通株式会社 Synchronization signal in wireless communication system
WO2014014396A1 (en) * 2012-07-20 2014-01-23 Telefonaktiebolaget L M Ericsson (Publ) Adjusting receive-transmit timing to compensate for switching errors in a communication system
WO2014027948A1 (en) * 2012-08-13 2014-02-20 Telefonaktiebolaget L M Ericsson (Publ) Method and apparatus for reference signal transmission and reception
WO2014058878A1 (en) * 2012-10-08 2014-04-17 Kyocera Corporation Advance communication resource notification in wireless communication systems having overlapping service areas
CN103973394B (en) * 2013-01-25 2018-07-17 索尼公司 The pattern notification method and device of public reference signal and determining method and apparatus
KR101466009B1 (en) * 2013-08-12 2014-12-03 (주)루먼텍 A method for high precision diversity synchronization and rf transmitting/receiving apparatus by using the same
EP2911462B1 (en) * 2014-01-31 2020-04-15 Avago Technologies International Sales Pte. Limited Time offset acquisition for dual connectivity
US10693623B2 (en) * 2014-01-31 2020-06-23 Apple Inc. Reference subframes for synchronization and cell measurements
CN103856947B (en) * 2014-02-07 2016-11-16 西安电子科技大学 The disturbance coordination method that a kind of combined channel selects and power controls
US10135586B2 (en) 2014-03-20 2018-11-20 Intel IP Corporation Reference signal enhancement for shared cell
US10027547B1 (en) * 2014-03-28 2018-07-17 EMC IP Holding Company LLC Autonomic self-optimization of protection storage
WO2015176266A1 (en) 2014-05-22 2015-11-26 Qualcomm Incorporated Periodic and aperiodic channel state information (csi) reporting for mimo
CN105471790B (en) * 2014-08-04 2020-05-15 北京三星通信技术研究有限公司 Cooperative transmission method, base station and terminal suitable for distributed antenna system
EP3189612A1 (en) * 2014-09-03 2017-07-12 Telefonaktiebolaget LM Ericsson (publ) Handling the ambiguity of the sending of hs-scch order in node b
KR102273529B1 (en) * 2015-02-27 2021-07-06 삼성전자 주식회사 Method and apparatus for adjusting signal of receiver
US10772055B2 (en) 2015-04-08 2020-09-08 Alcatel Lucent Base station synchronization
CN114513810A (en) 2015-04-16 2022-05-17 安德鲁无线系统有限公司 Uplink signal combiner and related methods and systems
JP6461718B2 (en) * 2015-06-05 2019-01-30 株式会社東芝 Management apparatus, system and method
US10034295B2 (en) * 2015-07-15 2018-07-24 Nokia Solutions And Networks Oy Coordination of downlink channel assignments for communication with cluster of access points in wireless network
US9832747B2 (en) * 2015-09-21 2017-11-28 Intel IP Corporation Mobile terminal device, mobile processing circuit and method of processing signals
US10158464B2 (en) * 2015-09-25 2018-12-18 Intel IP Corporation Mobile terminal devices, mobile processing circuits, and methods of processing signals
US11283536B2 (en) * 2015-09-25 2022-03-22 Telefonaktiebolaget Lm Ericsson (Publ) Method and network node for reducing interference in a wireless network
KR102328374B1 (en) * 2016-03-24 2021-11-18 포컬 포인트 포지셔닝 리미티드 A method, apparatus, computer program, chipset, or data structure for correlating digital signals and correlation codes.
MX2018012382A (en) 2016-06-03 2019-02-20 Panasonic Ip Corp America Transmitting device and transmitting method.
US10945147B2 (en) * 2016-09-28 2021-03-09 Telefonaktiebolaget Lm Ericsson (Publ) Dynamic CSI reporting type
KR102520779B1 (en) 2016-11-18 2023-04-11 도쿄엘렉트론가부시키가이샤 Compositional Emission Spectroscopy for Particle-Induced Arc Detection in Manufacturing Processes
WO2018161299A1 (en) * 2017-03-09 2018-09-13 华为技术有限公司 Wireless communication method, control device, node, and terminal device
CN108632979B (en) * 2017-03-20 2022-04-05 中兴通讯股份有限公司 Method, device and equipment for optimizing time synchronization error
WO2018201438A1 (en) * 2017-05-05 2018-11-08 Qualcomm Incorporated Communication scheme for small cyclic delay diversity reference signals
US10305537B2 (en) * 2017-06-23 2019-05-28 Qualcomm Incorporated Phase synchronization for reciprocity-based CoMP joint transmission with UE feedback of both co-phasing and slope
US11140673B2 (en) 2017-08-09 2021-10-05 Lg Electronics Inc. Method for reporting channel state information in wireless communication system, and apparatus therefor
CN110741583B (en) 2017-11-28 2022-01-21 Lg 电子株式会社 Method for reporting channel state information in wireless communication system and apparatus therefor
CN110035427B (en) 2018-01-12 2021-01-08 维沃移动通信有限公司 Time slot offset determination method and device
US20210314895A1 (en) * 2018-08-10 2021-10-07 Lg Electronics Inc. Method and apparatus for adjusting transmission timing by anchor node in wireless communication system
JP7315588B2 (en) * 2019-01-10 2023-07-26 株式会社Ｎｔｔドコモ Terminal, communication method, base station and system

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100316777B1 (en) 1999-08-24 2001-12-12 윤종용 Closed loop transmit antenna diversity method, base station apparatus and mobile station apparatus therefor in next generation mobile communication system
US6771706B2 (en) 2001-03-23 2004-08-03 Qualcomm Incorporated Method and apparatus for utilizing channel state information in a wireless communication system
US7116944B2 (en) 2002-02-07 2006-10-03 Lucent Technologies Inc. Method and apparatus for feedback error detection in a wireless communications systems
US10187133B2 (en) 2004-04-02 2019-01-22 Rearden, Llc System and method for power control and antenna grouping in a distributed-input-distributed-output (DIDO) network
EP1905172B1 (en) 2005-06-30 2017-06-21 Nokia Technologies Oy Apparatus, method and computer program product providing closed loop transmit antenna operation for systems using multiple antennas
US7738538B1 (en) 2005-08-01 2010-06-15 Ralink Technology Corporation Flexible and in-band signaling for nested preamble
EP2285012B1 (en) 2005-09-01 2012-12-19 Sharp Kabushiki Kaisha Transmission control method and apparatus using delays in multiple antenna systems
KR100902896B1 (en) 2006-08-18 2009-06-15 엘지전자 주식회사 Method For Transmitting and Receiving Signal For Error In Feedback Information
EP1919115A3 (en) * 2006-10-31 2014-01-29 NTT DoCoMo, Inc. Method, system, base station and user equipment for determining delay value of cyclic delay diversity
WO2008112255A2 (en) * 2007-03-13 2008-09-18 Interdigital Technology Corporation Cell reselection process for wireless communications
MX2009011411A (en) * 2007-04-27 2009-11-09 Ntt Docomo Inc Mobile communication system, base station device, mobile station device and propagation status gathering method.
US8917598B2 (en) 2007-12-21 2014-12-23 Qualcomm Incorporated Downlink flow control
KR20100035088A (en) 2008-09-25 2010-04-02 한국전자통신연구원 Cooperated communication method and base station thereof
JP5392268B2 (en) * 2009-01-05 2014-01-22 富士通株式会社 COMMUNICATION DEVICE, MOBILE STATION, AND COMMUNICATION CONTROL METHOD
US20110158164A1 (en) * 2009-05-22 2011-06-30 Qualcomm Incorporated Systems and methods for joint processing in a wireless communication
KR20170049615A (en) * 2009-06-23 2017-05-10 코닌클리케 필립스 엔.브이. Antenna configuration for co―operative beamforming
KR20100138264A (en) 2009-06-24 2010-12-31 주식회사 팬택 Method for compensating frequency attenuation using adaptive cyclic delay diversity, transmitting apparatus and method using the same, and receiving apparatus and method using the same
US8948028B2 (en) * 2009-10-13 2015-02-03 Qualcomm Incorporated Reporting of timing information to support downlink data transmission
JP5448962B2 (en) * 2009-12-14 2014-03-19 三菱電機株式会社 Wireless communication system, transmission control method, and receiving station
IT1398025B1 (en) 2010-02-12 2013-02-07 Andrew Llc DISTRIBUTED ANTENNA SYSTEM FOR MIMO COMMUNICATIONS.
JP5235201B2 (en) * 2010-03-05 2013-07-10 シャープ株式会社 Cellular communication system, base station apparatus, mobile station apparatus, communication control method, and communication control program
AU2011227860B2 (en) * 2010-03-17 2015-02-12 Qualcomm Incorporated Method and apparatus for providing channel state information-reference signal (CSI-RS) configuration information in a wireless communication system supporting multiple antennas
US9209950B2 (en) 2011-10-03 2015-12-08 Qualcomm Incorporated Antenna time offset in multiple-input-multiple-output and coordinated multipoint transmissions

Also Published As

Publication number Publication date
US9209950B2 (en) 2015-12-08
EP2879317A1 (en) 2015-06-03
JP2014535192A (en) 2014-12-25
WO2013052491A2 (en) 2013-04-11
KR101552268B1 (en) 2015-09-10
CN103875198A (en) 2014-06-18
JP6553014B2 (en) 2019-07-31
EP2764643A2 (en) 2014-08-13
CN103875198B (en) 2017-02-15
US9553702B2 (en) 2017-01-24
JP6042439B2 (en) 2016-12-14
US20130083780A1 (en) 2013-04-04
JP2017073795A (en) 2017-04-13
US20150131634A1 (en) 2015-05-14
WO2013052491A3 (en) 2013-07-18
KR20140056357A (en) 2014-05-09

Similar Documents

Publication Publication Date Title
IN2014CN01786A (en)
PH12018500996A1 (en) Power control for uplink transmissions
EP4283915A3 (en) Configuring reference signal transmission in wireless communications
WO2010124252A3 (en) Rank and precoding indication for mimo operation
WO2012036503A3 (en) Method and device for efficient feedback in wireless communication system that supports multiple antennas
WO2011129585A3 (en) Method and apparatus for efficient feedback in a wireless communication system that supports multiple antennas
WO2011028078A3 (en) Channel status information feedback method and apparatus in wireless communication system with relay station
PH12014502069A1 (en) Configuration of coordinated multipoint transmission hypotheses for channel state information reporting
EP3975609A3 (en) Interference measurement in wireless networks
MX2017000252A (en) Transmission timing control for d2d communication.
IN2014MN01898A (en)
WO2008097041A3 (en) Method for transmitting and receiving feedback information
IN2014CN01558A (en)
WO2012064100A3 (en) Method and terminal apparatus for transmitting a power status report in a wireless communication system
MX2010007696A (en) Ul/dl scheduling for full bandwidth utilization.
WO2009088225A3 (en) Method for transmitting and receiving channel state information periodically or aperiodically
WO2012105793A3 (en) Method of transmitting and receiving channel status information on multi-cell operation in a wireless communication system and apparatus for the same
MX2012014589A (en) Feedback processing method and system for uplink control signaling.
WO2012081881A3 (en) Method for transmitting and method for receiving a channel state information reference signal in a distributed multi-node system
WO2010135089A3 (en) Systems, apparatus and methods for interference management on downlink channels in wireless communication systems
WO2012044021A3 (en) Method and apparatus for efficient feedback in a wireless communication system that supports multiple antennas
WO2010093183A3 (en) Method for transmitting an uplink signal and feedback information, and relay apparatus using the method
WO2012138149A3 (en) Method and apparatus for scheduling in a wireless communication system.
WO2011084014A3 (en) Apparatus and method for enabling low latency transmissions in the uplink of a communication system
WO2010123297A2 (en) Method for transmitting feedback information and data using a precoding codebook for multicell cooperative communication in a wireless communication system