US Patent No: 5,109,528

Number of patents in Portfolio can not be more than 2000

Handover method for mobile radio system

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Abstract

The invention relates to a method in mobile radio systems in which the responsibility for transmitting message information to a mobile station is handed over from a first base station transmitter to a second base station transmitter. In this method, the same radio channel is used, if possible, before and after the handover for transmitting message information to the mobile station. If the same radio channel can be utilized, the handover takes place without the mobile station being informed beforehand of the handover by a special signal or order or the like. In digital mobile ratio systems with digital transmission of message information by digital modulation of the radio signals, the transmission is preferably started from a second base station transmitter before the transmission is terminated from a first base station transmitter. During a certain transmission time substantially the same message information is transmitted to the mobile station from both the first and second base station transmitters.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)STOCKHOLM6840

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Uddenfeldt, Jan-Erik Hasselby, SE 4 270

Cited Art

Patent Info (Count) # Cites Year
 
GENERAL ELECTRIC COMPANY (2)
4,718,081 Method and apparatus for reducing handoff errors in a cellular radio telephone communications system 101 1986
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BBC Brown, Boveri & Company, Limited (1)
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Hopeman, III; A. A. (1)
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LUCENT TECHNOLOGIES INC. (1)
4,697,260 Method of and arrangement for transmitting messages in a digital radio transmission system 67 1985
 
MOTOROLA, INC. (1)
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4,211,894 Transmitter multiplexing system for a land mobile communication system 30 1978
 
The Tokyo Electric Power Co., Ltd. (1)
4,955,082 Mobile communication system 82 1989

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
KINETO WIRELESS, INC. (66)
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6,647,426 Apparatus and method for integrating an unlicensed wireless communications system and a licensed wireless communications system 109 2002
7,308,263 Apparatus for supporting the handover of a telecommunication session between a licensed wireless system and an unlicensed wireless system 50 2002
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7,634,269 Apparatus and method for extending the coverage area of a licensed wireless communication system using an unlicensed wireless communication system 9 2004
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7,565,145 Handover messaging in an unlicensed mobile access telecommunications system 13 2005
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7,515,575 Intelligent access point scanning with self-learning capability 5 2005
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7,904,084 Intelligent access point scanning with self-learning capability 1 2009
8,041,335 Method and apparatus for routing of emergency services for unauthorized user equipment in a home Node B system 8 2009
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8,160,588 Method and apparatus for supporting the handover of a telecommunication session between a licensed wireless system and an unlicensed wireless system 0 2010
8,045,493 Mechanisms to extend UMA or GAN to inter-work with UMTS core network 0 2010
 
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5,745,856 Radio receiver for demodulating both wideband and narrowband modulated signals 14 1997
6,259,927 Transmit power control in a radio communication system 58 1997
RE36078 Handover method for mobile radio system 11 1997
6,405,048 Method and system for autonomously allocating frequencies to a radio system sharing frequencies with an overlapping macro radio system 25 1998
6,085,108 Modified downlink power control during macrodiversity 59 1998
6,519,248 Packet data network having distributed database 27 1998
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QUALCOMM INCORPORATED (17)
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5,933,787 Method and apparatus for performing handoff between sectors of a common base station 63 1996
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NETMOTION WIRELESS, INC. (9)
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NOKIA CORPORATION (5)
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ALCATEL CIT (1)
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ALCATEL N.V. (1)
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HITACHI, LTD. (1)
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MOTOROLA, INC. (1)
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