[특허]Methods and systems for mobile terminal assisted handover in an private radio communications network

[미국특허] Methods and systems for mobile terminal assisted handover in an private radio communications network 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04L-009/00
출원번호	US-0705724 (1996-08-30)
발명자 / 주소	Haartsen Jacobus Cornelis,SEX
출원인 / 주소	Telefonaktiebolaget, L.M. Ericsson, SEX
대리인 / 주소	Myers Bigel Sibley & Sajovec, P.A.
인용정보	피인용 횟수 : 41 인용 특허 : 7

초록 ▼

Mobile assisted handover of an encrypted traffic connection between linked base stations of a private radio communications network are provided in a system including a plurality of base stations and a mobile terminal. The mobile terminal detects a signal quality of a received beacon transmission from a private base station of the private radio communications network while an encrypted traffic connection is underway with another base station of the private radio communications network. The beacon transmissions are received and a signal quality detected during idle frames of the ongoing traffic connection. The mobile terminal may also detect signal quality of the ongoing traffic connection and transmit it to the base station. The detected signal quality and identification of the beacon transmitting private base station are provided to the private radio communications network which determines whether a handover should be initiated. Depending upon which of the forwarding or receiving base stations current TDMA frame number will be used for encryption of a handed over encrypted traffic connection, a reference TDMA frame number is exchanged between the forwarding and receiving base station. If the receiving base station TDMA reference number is to be used, it is forwarded to the mobile terminal on a control channel of the ongoing encrypted traffic connection from the forwarding base station. The transfer takes place within a single multiframe of the TDMA protocol of the private radio communications network and, after correction for any delays in transfer of the TDMA reference number, handover takes place in the following multiframe.

대표청구항 ▼

[ That which is claimed:] [1.] A private radio communications network with mobile assisted handover between linked base stations of the private radio communications network having a TDMA protocol of an encrypted traffic connection between the private radio communications network and a mobile terminal, comprising:a first base station including:communications control means for controlling radio communications according to said TDMA protocol including means for defining a traffic channel and a beacon channel corresponding to an idle frame of said traffic channel, said communications control means including means for handing over said encrypted traffic connection;encryption means for encrypting said traffic connection using an encryption algorithm having an output dependent on a reference TDMA frame number;transceiver means for transmitting and receiving said encrypted traffic connection on said traffic channel; and,means for transmitting radio beacon transmissions free of a TDMA frame number on said beacon channel;a second base station of said private radio communications network linked to said first base station including:communications control means for controlling radio communications according to said TDMA protocol including means for defining a traffic channel and a beacon channel corresponding to an idle frame of said traffic channel and further including means for synchronizing said traffic channel and said beacon channel of said second base station with said traffic channel and said beacon channel of said first base station, said communications control means of said second base station including means for receiving said handed over encrypted traffic connection from said first base station;encryption means for encrypting said traffic connection using said encryption algorithm having an output dependent on a reference TDMA frame number;transceiver means transmitting and receiving said encrypted traffic connection on said traffic channel; and,means for transmitting radio beacon transmissions free of a TDMA frame number on said beacon channel; and,a mobile terminal including:transceiver means for transmitting and receiving said encrypted traffic connection on said traffic channel of said first base station;encryption means for encrypting said traffic connection using said encryption algorithm having an output dependent on a reference TDMA frame number;means for receiving said transmitted radio beacon transmissions free of a TDMA frame number on said beacon channel of said second base station during an idle frame of said traffic connection with said first base station; and,wherein said means for initiating handover includes means for exchanging a current reference TDMA frame number with said second base station.

이 특허에 인용된 특허 (7) 인용/피인용 타임라인 분석

Uddenfeldt Jan-Erik (Vllingby SEX), Handover method for mobile radio system.
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Malek Charles J. (Crystal Lake IL) Gravunder Greg G. (Kenosha WI), Method and apparatus for maintaining continuous synchronous encryption and decryption in a wireless communication system.
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Raith Krister A. (Durham NC) Dent Paul W. (Stehag SEX), Method of and apparatus for selective resynchronization in a digital cellular communications system.
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Dent Paul W. (Stehag SEX) Haartsen Jacobus C. (Staffanstorp SEX), Radio personal communications system and method for allocating frequencies for communications between a cellular termina.
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Dent Paul (Stehag SEX), Resynchronization of encryption systems upon handoff.
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O\Connor James M. (North Richland Hills TX) Schorman Eric R. (Bedford TX) Reed John D. (Arlington TX) Rohani Kamyar (Fort Worth TX), Signal transmission synchronization in a communication system.
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Dahlin Jan E. Å. S. (Jrflla SEX) Ghisler Walter (Upplands Vsby SEX) Persson Bengt Y. (Djursholm SEX), Synchronizing method in a mobile radio system.
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이 특허를 인용한 특허 (41) 인용/피인용 타임라인 분석

Jacobus C. Haartsen NL, Access technique of channel hopping communications system.
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Holcman,Alejandro R.; Hunter,Andrew T.; Jain,Nikhil, Apparatus and method of using a ciphering key in a hybrid communications network.
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Gremmelmaier Ulrich,DEX, Arrangement and method for mobile communications having an IP link.
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Rosenhed,Mikael, Base transceiver station automatic encryption handling.
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Townend, Jonathan Richard; Lobley, Nigel Clive, Cellular mobile telephone network operation.
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Munday Peter R,GBX ; Goetz Ian,GBX ; Gannon Stephen M,GBX, Cellular radio location system.
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Dent, Paul W., Communication system with a mobile terminal supporting mobile assisted signal strength measurements for a plurality of networks and methods for operating the same.
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Isokangas, Jari; Sarkkinen, Sinikka, Controlling communications between stations.
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Husak, Jan; Lahner, Frank; Thamm, Peter, Energy and time-efficient set-up of a wireless communication system.
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Westerberg Erik,SEX, Limiting access to private networks in cellular communications systems.
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Yoshizawa, Kensuke; Ohmi, Shinichiro; Yamaguchi, Tsuyoshi, Master station in communications system and access control method.
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Funato, Daichi; Watanabe, Fujio; Miki, Toshio, Method and apparatus for dormant mode support with paging.
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Funato, Daichi; Watanabe, Fujio; Miki, Toshio, Method and apparatus for dormant mode support with paging.
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Funato, Daichi; Watanabe, Fujio; Miki, Toshio, Method and apparatus for dormant mode support with paging.
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Funato, Daichi; Watanabe, Fujio; Miki, Toshio, Method and apparatus for dormant mode support with paging.
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Jeong,Moo Ryong; Watanabe,Fujio; Kawahara,Toshiro, Method and apparatus for dormant mode support with paging.
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Holcman, Alejandro R., Method and apparatus for effecting handoff between different cellular communications systems.
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Nagaraja, Sumeeth; Yavuz, Mehmet; Meshkati, Farhad; Radulescu, Andrei D.; Chevallier, Christophe, Method and apparatus for facilitating a beacon-assisted handover to a home Node-B for users on an active call.
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Nagaraja, Sumeeth; Yavuz, Mehmet; Meshkati, Farhad; Radulescu, Andrei Dragos; Chevallier, Christophe, Method and apparatus for facilitating a beacon-assisted handover to a home node-B for users on an active call.
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Rose, Gregory G., Method and apparatus for initializing a new stream cipher during handoff.
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Quick, Jr., Roy Franklin; Ho, Sai Yiu Duncan, Method and apparatus for message integrity in a CDMA communication system.
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Tiedemann, Jr., Edward G., Method and apparatus for performing idle handoff in a multiple access communication system.
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Tiedemann, Jr.,Edward G., Method and apparatus for performing idle handoff in a multiple access communication system.
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Rose, Gregory G., Method and apparatus for re-synchronization of a stream cipher during handoff.
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Rose,Gregory G., Method and apparatus for re-synchronization of a stream cipher during handoff.
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Christensson, Anders; Bergström, Andreas; Schliwa-Bertling, Paul, Method and arrangement in a telecommunication system.
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Heinonen,Tomi; Nyberg,Kaisa, Method and system for access point roaming.
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Rudolf, Marian, Method and system for improved beacon acquisition performance with time slot and antenna sector reuse.
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Schorman Eric Reed ; Rozanski ; Jr. Walter Joseph ; Clark Michael Paul, Method and system for optimizing a traffic channel in a wireless communications system.
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Fiat, Lionel, Method for enhanced handover detection for mobile networks, a mobile terminal, an access point and program modules therefor.
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Laroia, Rajiv; Li, Junyi; Lane, Frank A., Methods and apparatus for performing handoffs in a multi-carrier wireless communications systems.
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Kobylinski Richard A. ; Majmundar Milap V., Mobile assisted handoff system and method.
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Kobylinski, Richard A.; Majmundar, Milap V., Mobile assisted handoff system and method.
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Kobylinski,Richard A.; Majmundar,Milap V., Mobile assisted handoff system and method.
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Kobylinski,Richard A.; Majmundar,Milap V., Mobile assisted handoff system and method.
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Posti Harri,FIX, Radio system for cordless subscriber line interface.
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Yi Cheng SE; Lars Bjorup SE; Martin Jakob Rinman SE; Karl Dan Gustav Jerrestam SE, Reuse of security associations for improving hand-over performance.
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Benoist, Sebire, Rotating synchronization channel (SCH) transmission.
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Klingler, Eric; Tedeschi, Jeffrey, Synchronization of encryption in a wireless communication system.
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Ala-Laurila, Juha; Hansen, Harri; Salvela, Juha, Transfer of security association during a mobile terminal handover.
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Panasik, Carl M.; Siep, Thomas M., Wireless network circuits, systems, and methods for frequency hopping with reduced packet interference.
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[미국특허] Methods and systems for mobile terminal assisted handover in an private radio communications network 원문보기