CA2145165A1 - Handoff Monitoring in Cellular Communication Networks Using Slow Frequency Hopping - Google Patents

Handoff Monitoring in Cellular Communication Networks Using Slow Frequency Hopping

Info

Publication number
CA2145165A1
CA2145165A1 CA2145165A CA2145165A CA2145165A1 CA 2145165 A1 CA2145165 A1 CA 2145165A1 CA 2145165 A CA2145165 A CA 2145165A CA 2145165 A CA2145165 A CA 2145165A CA 2145165 A1 CA2145165 A1 CA 2145165A1
Authority
CA
Canada
Prior art keywords
base station
frequency hopping
mobile
transmission
stations
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.)
Granted
Application number
CA2145165A
Other languages
French (fr)
Other versions
CA2145165C (en
Inventor
Chia-Chi Huang
David F. Bantz
Frederic J. Bauchot
Kadathur S. Natarajan
Anand Narasimhan
Michele M. Wetterwald
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of CA2145165A1 publication Critical patent/CA2145165A1/en
Application granted granted Critical
Publication of CA2145165C publication Critical patent/CA2145165C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Abstract

Methods for handoff in a wireless communication network comprised of a local area network connected to a plurality of base stations, each of which has a geographic area, defined as a cell, within which mobile stations can communicate with a base station, with each such base station being capable of performing bidirectional wireless communication with one or more of said mobile stations under control of a controller, with communication between base stations and mobile stations being performed by frequency hopping, with there being n available frequency hopping channels in a fixed frequency band, with each channel being of a same fixed duration and having a fixed frequency different than another channel. The handoff method employs structure and techniques for determining by a mobile station that the quality of transmission between it and a current base station has degraded below a predetermined performance level, structure and technique for said mobile station to listen to each of successive frequency channels for a duration substantially less than said fixed duration of a channel until it senses a transmission from another base station, and structure and techniques for transferring control of said mobile station to said another base station in response to the sensed transmission.
CA002145165A 1994-04-12 1995-03-20 Handoff monitoring in cellular communication networks using slow frequency hopping Expired - Fee Related CA2145165C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/226,724 US5448569A (en) 1994-04-12 1994-04-12 Handoff monitoring in cellular communication networks using slow frequency hopping
US226,724 1994-04-12

Publications (2)

Publication Number Publication Date
CA2145165A1 true CA2145165A1 (en) 1995-10-13
CA2145165C CA2145165C (en) 1999-03-02

Family

ID=22850142

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002145165A Expired - Fee Related CA2145165C (en) 1994-04-12 1995-03-20 Handoff monitoring in cellular communication networks using slow frequency hopping

Country Status (5)

Country Link
US (1) US5448569A (en)
EP (1) EP0677940B1 (en)
JP (1) JP3202883B2 (en)
CA (1) CA2145165C (en)
DE (1) DE69531076T2 (en)

Families Citing this family (109)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5815811A (en) * 1989-06-29 1998-09-29 Symbol Technologies, Inc. Preemptive roaming in a cellular local area wireless network
WO1995003657A1 (en) * 1993-07-21 1995-02-02 Fujitsu Limited Atm exchange
HU220989B1 (en) 1994-05-05 2002-07-29 Sprint Communications Company, LP Method and telecommunications system for processing telecommunication calls
US6633561B2 (en) 1994-05-05 2003-10-14 Sprint Communications Company, L.P. Method, system and apparatus for telecommunications control
JP3326292B2 (en) * 1994-05-24 2002-09-17 株式会社東芝 Communication device and communication method thereof
JP3047767B2 (en) * 1995-03-20 2000-06-05 株式会社日立製作所 Wireless LAN system
US5873036A (en) * 1995-04-12 1999-02-16 Watkins-Johnson Company Apparatus and method for improving cellular communication by associating users on a mobile platform with a common platform identifier
GB9508696D0 (en) * 1995-04-28 1995-06-14 At & T Corp Method for connecting roaming stations in a source routed bridged local area network
US5781582A (en) * 1995-05-04 1998-07-14 Interwave Communications International Ltd. Frequency agile transceiver with multiple frequency synthesizers per transceiver
JP2713228B2 (en) * 1995-05-16 1998-02-16 日本電気株式会社 Mobile wireless communication method
JP3036407B2 (en) * 1995-09-12 2000-04-24 トヨタ自動車株式会社 Mobile radio communication system
US6058289A (en) * 1995-09-26 2000-05-02 Pacific Communication Sciences, Inc. Method and apparatus for low power mobile unit for cellular communications system
US6580700B1 (en) * 1995-10-27 2003-06-17 Symbol Technologies, Inc. Data rate algorithms for use in wireless local area networks
US5841764A (en) * 1995-10-30 1998-11-24 Ericsson Inc. Method and apparatus for permitting a radio to originate and receive data messages in a data communications network
US5812777A (en) * 1995-12-28 1998-09-22 Compaq Computer Corporation Remote terminal operation
FI102447B (en) * 1996-02-06 1998-11-30 Nokia Telecommunications Oy Method of establishing connection, subscriber terminal and radio system
GB2314734B (en) * 1996-06-28 2000-11-01 Motorola Ltd Method and apparatus for monitoring channels
US5812930A (en) * 1996-07-10 1998-09-22 International Business Machines Corp. Information handling systems with broadband and narrowband communication channels between repository and display systems
US6119006A (en) 1997-01-03 2000-09-12 Siemens Information And Communication Systems, Inc. System and method for calendar-based cellular smart switching
US6477374B1 (en) 1997-01-03 2002-11-05 Siemens Information And Communication Networks, Inc. Apparatus and method for calendar based call routing
FI107008B (en) * 1997-04-22 2001-05-15 Nokia Networks Oy Multimode terminal network connection in a mobile communication system
US6141555A (en) * 1997-06-09 2000-10-31 Nec Corporation Cellular communication system, and mobile and base stations used in the same
DE19738340C2 (en) 1997-09-02 2001-03-15 Siemens Ag Roaming of mobile parts in at least partially asynchronous wireless telecommunication networks, especially DECT networks
KR20000007433A (en) * 1998-07-03 2000-02-07 윤종용 Method for realizing preference of mobile radio combiner in frequency hopping system
US6311059B1 (en) * 1999-02-05 2001-10-30 Nec Corporation Mobile radio station
US6490446B1 (en) * 1999-04-09 2002-12-03 Telefonaktiebolaget Lm Ericsson (Publ) Uncoordinated frequency hopping cellular system
US6556553B1 (en) 1999-04-12 2003-04-29 Intermec Ip Corp. Method for determining when a communication device should rate shift or roam in a wireless environment
US7180903B1 (en) * 1999-05-10 2007-02-20 Telefonaktiebolaget Lm Ericsson (Publ) Resource management in uncoordinated frequency hopping system
US7027773B1 (en) 1999-05-28 2006-04-11 Afx Technology Group International, Inc. On/off keying node-to-node messaging transceiver network with dynamic routing and configuring
WO2000074402A1 (en) * 1999-05-28 2000-12-07 Afx Technology Group International, Inc. Wireless transceiver network employing node-to-node data messaging
US8041359B1 (en) * 1999-08-02 2011-10-18 Alcatel Lucent Method for maintaining a communication link in wireless network groups
FI108769B (en) * 2000-04-07 2002-03-15 Nokia Corp Connecting an access point in a wireless communication system
US6430395B2 (en) * 2000-04-07 2002-08-06 Commil Ltd. Wireless private branch exchange (WPBX) and communicating between mobile units and base stations
EP1670234A3 (en) * 2000-05-19 2006-08-30 Lucent Technologies Inc. Wireless LAN with load balancing
US7043286B1 (en) * 2000-06-13 2006-05-09 Leason Holding Company, Llc. Extrinsic signal to shunt an acoustic driver in a cellular telephone, pager or the like
DE10061692C1 (en) * 2000-12-12 2002-06-27 Fraunhofer Ges Forschung Base station, handset and communication network
US7065063B2 (en) * 2001-04-11 2006-06-20 Research In Motion Limited System and method for balancing communication traffic loading between adjacent base stations in a mobile communications network
JP2002320260A (en) * 2001-04-19 2002-10-31 Toshiba Corp Mobile communication terminal
JP4161782B2 (en) * 2002-04-18 2008-10-08 松下電器産業株式会社 Mobile node and mobile communication method
EP1387537B1 (en) * 2002-08-02 2014-03-12 Broadcom Corporation Interoperability of a network interface protocol with an internet interface protocol
US6993335B2 (en) * 2002-11-15 2006-01-31 Motorola, Inc. Apparatus and method for mobile/IP handoff between a plurality of access technologies
KR100489683B1 (en) * 2002-12-02 2005-05-17 삼성전자주식회사 Apparatus for controlling the load balance in multi-access points and method thereof
DE10311967B4 (en) * 2003-03-18 2005-06-23 Infineon Technologies Ag Method for field strength determination
US6980535B2 (en) * 2003-08-28 2005-12-27 Motorola, Inc. Passive probing for handover in a local area network
US7092353B2 (en) * 2003-10-17 2006-08-15 Qualcomm Incorporated Carrier search methods and apparatus
US7221927B2 (en) 2004-02-13 2007-05-22 Trapeze Networks, Inc. Station mobility between access points
WO2006068556A1 (en) * 2004-12-21 2006-06-29 Telefonaktiebolaget Lm Ericsson (Publ) Blind handover using load compensated measurements
DE112006000618T5 (en) 2005-03-15 2008-02-07 Trapeze Networks, Inc., Pleasanton System and method for distributing keys in a wireless network
US7724703B2 (en) 2005-10-13 2010-05-25 Belden, Inc. System and method for wireless network monitoring
US8638762B2 (en) 2005-10-13 2014-01-28 Trapeze Networks, Inc. System and method for network integrity
US7573859B2 (en) 2005-10-13 2009-08-11 Trapeze Networks, Inc. System and method for remote monitoring in a wireless network
US7551619B2 (en) 2005-10-13 2009-06-23 Trapeze Networks, Inc. Identity-based networking
WO2007044986A2 (en) * 2005-10-13 2007-04-19 Trapeze Networks, Inc. System and method for remote monitoring in a wireless network
ES2274716B1 (en) * 2005-10-25 2008-05-01 Vodafone España, S.A. SYSTEM AND PROCEDURE TO ASSIST A MOBILE TERMINAL IN THE RESELECTION OR TRANSFER OF CELLS BETWEEN DIFFERENT TECHNOLOGIES.
US8250587B2 (en) 2005-10-27 2012-08-21 Trapeze Networks, Inc. Non-persistent and persistent information setting method and system for inter-process communication
US8135407B2 (en) * 2005-12-09 2012-03-13 Telefonaktiebolaget Lm Ericsson (Publ) Network evaluated hard hardover using predictions
US20070160007A1 (en) * 2006-01-11 2007-07-12 Li-Chun Wang Method and device for cost-function based handoff determination using wavelet prediction in vertical networks
US20070198682A1 (en) * 2006-02-22 2007-08-23 Pazhyannur Rajesh S Method and system for seamless media handover across devices
KR101257110B1 (en) * 2006-04-12 2013-04-22 삼성전자주식회사 Apparatus and method for determining packet service reconnection time
US7558266B2 (en) 2006-05-03 2009-07-07 Trapeze Networks, Inc. System and method for restricting network access using forwarding databases
US8966018B2 (en) 2006-05-19 2015-02-24 Trapeze Networks, Inc. Automated network device configuration and network deployment
US7577453B2 (en) 2006-06-01 2009-08-18 Trapeze Networks, Inc. Wireless load balancing across bands
US9191799B2 (en) 2006-06-09 2015-11-17 Juniper Networks, Inc. Sharing data between wireless switches system and method
US9258702B2 (en) 2006-06-09 2016-02-09 Trapeze Networks, Inc. AP-local dynamic switching
US8818322B2 (en) 2006-06-09 2014-08-26 Trapeze Networks, Inc. Untethered access point mesh system and method
US7912982B2 (en) 2006-06-09 2011-03-22 Trapeze Networks, Inc. Wireless routing selection system and method
US7844298B2 (en) 2006-06-12 2010-11-30 Belden Inc. Tuned directional antennas
US7724704B2 (en) 2006-07-17 2010-05-25 Beiden Inc. Wireless VLAN system and method
US8340110B2 (en) 2006-09-15 2012-12-25 Trapeze Networks, Inc. Quality of service provisioning for wireless networks
US8072952B2 (en) 2006-10-16 2011-12-06 Juniper Networks, Inc. Load balancing
US7974235B2 (en) * 2006-11-13 2011-07-05 Telecommunication Systems, Inc. Secure location session manager
US7873061B2 (en) 2006-12-28 2011-01-18 Trapeze Networks, Inc. System and method for aggregation and queuing in a wireless network
JP2008236079A (en) * 2007-03-16 2008-10-02 Kyocera Corp Wireless communication equipment and wireless communication method
WO2008122754A1 (en) * 2007-04-05 2008-10-16 British Telecommunications Public Limited Company Channel selection in a wireless network
US8902904B2 (en) 2007-09-07 2014-12-02 Trapeze Networks, Inc. Network assignment based on priority
US8509128B2 (en) 2007-09-18 2013-08-13 Trapeze Networks, Inc. High level instruction convergence function
US8743887B2 (en) * 2007-10-09 2014-06-03 Qualcomm Incorporated Methods and apparatus for mobility support and IP multimedia subsystem (IMS) registration in a multimode network environment
US8780857B2 (en) * 2007-10-09 2014-07-15 Qualcomm Incorporated Methods and apparatus for mobility support between network domains
EP2991402B1 (en) 2007-11-20 2018-09-19 Interdigital Patent Holdings, Inc. Method and apparatuses for performing handover
US8238942B2 (en) 2007-11-21 2012-08-07 Trapeze Networks, Inc. Wireless station location detection
US8150357B2 (en) 2008-03-28 2012-04-03 Trapeze Networks, Inc. Smoothing filter for irregular update intervals
US8474023B2 (en) 2008-05-30 2013-06-25 Juniper Networks, Inc. Proactive credential caching
US8978105B2 (en) 2008-07-25 2015-03-10 Trapeze Networks, Inc. Affirming network relationships and resource access via related networks
US8218600B2 (en) * 2008-08-22 2012-07-10 Siemens Aktiengesellschaft Frequency hopping network with a guaranteed handoff delay
US8238298B2 (en) 2008-08-29 2012-08-07 Trapeze Networks, Inc. Picking an optimal channel for an access point in a wireless network
US8483129B2 (en) * 2008-11-17 2013-07-09 Xg Technology, Inc. RTP voice packets for base station hand-off in mobile IP telephony
US20130121205A1 (en) * 2009-01-26 2013-05-16 Floyd Backes Method for Selecting an Optimum Access Point in a Wireless Network on a Common Channel
KR101609393B1 (en) * 2009-11-19 2016-04-05 삼성전자주식회사 Method and apparatus of allocating femto cell information for handover in a wireless communication
US8542836B2 (en) 2010-12-01 2013-09-24 Juniper Networks, Inc. System, apparatus and methods for highly scalable continuous roaming within a wireless network
US20130279472A1 (en) 2012-04-06 2013-10-24 Suitable Technologies, Inc. System for wireless connectivity continuity and quality
US20130279487A1 (en) 2012-04-06 2013-10-24 Suitable Technologies, Inc. System for wireless connectivity continuity and quality
US20130279479A1 (en) 2012-04-06 2013-10-24 Suitable Technologies, Inc. Method for wireless connectivity continuity and quality
US20130265885A1 (en) 2012-04-06 2013-10-10 Suitable Technologies, Inc. Method for wireless connectivity continuity and quality
US9320074B2 (en) 2012-04-06 2016-04-19 Suitable Technologies, Inc. Method for wireless connectivity continuity and quality
US20130265958A1 (en) 2012-04-06 2013-10-10 Suitable Technolgies, Inc. System for wireless connectivity continuity and quality
US20130279411A1 (en) 2012-04-06 2013-10-24 Suitable Technologies, Inc. Method for wireless connectivity continuity and quality
US9344935B2 (en) * 2012-04-06 2016-05-17 Suitable Technologies, Inc. System for wireless connectivity continuity and quality
US20130343344A1 (en) 2012-04-06 2013-12-26 Suitable Technologies, Inc. Method for wireless connectivity continuity and quality
US20130279473A1 (en) 2012-04-06 2013-10-24 Suitable Technologies, Inc. Method for wireless connectivity continuity and quality
US9307568B2 (en) 2012-04-06 2016-04-05 Suitable Technologies, Inc. System for wireless connectivity continuity and quality
US9320076B2 (en) 2012-04-06 2016-04-19 Suitable Technologies, Inc. System for wireless connectivity continuity and quality
US20160164976A1 (en) 2012-09-24 2016-06-09 Suitable Technologies, Inc. Systems and methods for remote presence
EP3080940B1 (en) * 2013-12-12 2017-11-29 Telefonaktiebolaget LM Ericsson (publ) Network node, wireless device and methods for handling evaluation of a secondary cell for a wireless device
CN111818663B (en) * 2015-12-08 2022-07-22 华为技术有限公司 Data sending method, base station and terminal equipment
DE102017206236A1 (en) * 2017-04-11 2018-10-11 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. SPECIFIC HOPPING PATTERN FOR TELEGRAM SPLITTING
GB2567622B (en) 2017-10-12 2022-02-09 Airspan Ip Holdco Llc Metrics using parameters for multiple radio configurations
US11714127B2 (en) 2018-06-12 2023-08-01 International Business Machines Corporation On-chip spread spectrum characterization
US11146307B1 (en) * 2020-04-13 2021-10-12 International Business Machines Corporation Detecting distortion in spread spectrum signals
US11693446B2 (en) 2021-10-20 2023-07-04 International Business Machines Corporation On-chip spread spectrum synchronization between spread spectrum sources

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4829519A (en) * 1987-06-09 1989-05-09 Scotton Geoffrey R Automatic cell transfer system with error rate assessment
US5042082A (en) * 1989-06-26 1991-08-20 Telefonaktiebolaget L. M. Ericsson Mobile assisted handoff
SE466081B (en) * 1990-04-26 1991-12-09 Ericsson Telefon Ab L M PROCEDURES FOR HANDOFFS IN A MOBILE RADIO SYSTEM
US5276906A (en) * 1990-09-27 1994-01-04 Motorola, Inc. Radiotelephone system incorporating two thresholds for handoff
US5212806A (en) * 1990-10-29 1993-05-18 International Business Machines Corporation Distributed control methods for management of migrating data stations in a wireless communications network
US5181200A (en) * 1990-10-29 1993-01-19 International Business Machines Corporation Handoff method and apparatus for mobile wireless workstation
JP2679442B2 (en) * 1991-04-17 1997-11-19 日本電気株式会社 Digital mobile communication system
US5123029A (en) * 1991-06-21 1992-06-16 International Business Machines Corporation Broadcast-initiated bipartite frame multi-access protocol
US5267261A (en) * 1992-03-05 1993-11-30 Qualcomm Incorporated Mobile station assisted soft handoff in a CDMA cellular communications system
US5287384A (en) * 1992-10-15 1994-02-15 Lxe Inc. Frequency hopping spread spectrum data communications system
GB9226707D0 (en) * 1992-12-22 1993-02-17 Ncr Int Inc Wireless local area network system with mobile station handover

Also Published As

Publication number Publication date
DE69531076D1 (en) 2003-07-24
US5448569A (en) 1995-09-05
DE69531076T2 (en) 2004-05-06
EP0677940A3 (en) 1995-11-29
CA2145165C (en) 1999-03-02
JP3202883B2 (en) 2001-08-27
JPH07297841A (en) 1995-11-10
EP0677940B1 (en) 2003-06-18
EP0677940A2 (en) 1995-10-18

Similar Documents

Publication Publication Date Title
CA2145165A1 (en) Handoff Monitoring in Cellular Communication Networks Using Slow Frequency Hopping
KR100222631B1 (en) Handoff method of mobile terminal
CA2267029A1 (en) Method of preventing interference of adjacent frequencies in a cellular system by selection between adjacent carrier frequency and non-adjacent carrier frequency
KR960027578A (en) How to transfer handover of wireless transmissions to a mobile terminal and how to assign channels to mobile terminals
TW343419B (en) Adaptive neighbor cell list
WO2003060631A3 (en) Soft handoff in a wireless communication system
CA2205714A1 (en) Scheme for controlling transmission powers during soft handover in a cdma mobile communication system
CA2264125A1 (en) Method of controlling transmission power in a cellular type mobile communication system
FI964882A (en) Channel scanning in a cellular telephone system
WO2004015877A3 (en) Method of creating and utilizing diversity in a multiple carrier communication system
EP2040388A3 (en) Method and system for mobile communications
EP0654952A3 (en) Method and apparatus for dynamic channel allocation for wireless communication
CA2187412A1 (en) Method for Setting Up Perch Channels in Mobile Communication by Cellular System
WO1997031433A3 (en) Method and apparatus for dynamically selecting the length of mobile station burst communications on the reverse digital control channel
WO2000054437A3 (en) Method and apparatus for maximizing the use of available capacity in a communication system
WO1996021998A3 (en) Radio system for cordless subscriber line interface
EP0954194A3 (en) Soft handoff method for a mobile radio communication system
WO2003049409A3 (en) System and method utilizing dynamic beam forming for wireless communication signals
CA2333176A1 (en) Cellular radiotelephone systems and methods that broadcast a common control channel over multiple radio frequencies
ATE223123T1 (en) STRATEGY FOR DIVERSITY TRANSMISSION IN MOBILE/INDOOR CELLULAR RADIO COMMUNICATION
CN100452900C (en) Method of microcell management in mobile communication system using centralized base station
CA2295555A1 (en) Handoff method in a mobile communication system supporting transmission diversity
GB2375460B (en) Cellular radio communication systems and methods and equipment for use therein
MY118048A (en) Mobile telephone systems
AU7295200A (en) Handover performed within a base station controller

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed
MKLA Lapsed

Effective date: 20100322