US Patent No: 4,628,152

Number of patents in Portfolio can not be more than 2000

Method and apparatus for transmission of telephone calls to a portable, wireless telephone set

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ATTORNEY / AGENT: (SPONSORED)
 

Importance

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Abstract

A method and an equipment for wireless transmission of telephone calls between a stationary unit (1) connected to a telephone set (3) at a short distance from the stationary unit provides that all pairs of units (1, 3) have access to a plurality of common duplex radio speech channels for transmission of calls, and to a common radio signalling channel for transmission of signals referring to connection and disconnection of the speech channels. The radio speech channels are assigned after adaptive channel scanning in that they are listened to before a call, and a channel selected which is idle with respect to calls. The selection of an idle channel takes place automatically with the use of radio receivers (12, 25), channel selectors (15, 28) and circuits (16, 29) incorporated in both units.

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First Claim

Related Publications

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Patent Owner(s)

Patent OwnerAddressTotal Patents
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)STOCKHOLM6728

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Akerberg, Dag E Kungsangen, SE 11 457

Cited Art

Patent Info (Count) # Cites Year
 
PORTAPHONE AG (1)
4,467,141 Telecommunication system with radio line 8 1982
 
U.S. PHILIPS CORPORATION (1)
4,228,319 Automatic radio telephone system 20 1978

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
HYSKY TECHNOLOGIES, INC. (4)
5,765,112 Low cost wide area network for data communication using outbound message specifying inbound message time and frequency 17 1995
5,734,963 Remote initiated messaging apparatus and method in a two way wireless data communications network 80 1995
5,589,844 Automatic antenna tuner for low-cost mobile radio 23 1995
5,640,442 Technique for determining propagating and clear frequency to be used in wide area wireless data communications network 26 1996
 
NEC CORPORATION (3)
4,768,218 Radio key telephone system having a common signaling channel 40 1987
4,837,801 Base station capable of monitoring occurrence of interference on every transmission 8 1987
4,744,101 Cordless telephone system 14 1987
 
BELL CANADA INTERNATIONAL INC. (2)
5,276,908 Call set-up and spectrum sharing in radio communication on systems with dynamic channel allocation 75 1990
5,497,505 Call set-up and spectrum sharing in radio communication on systems with dynamic channel allocation 86 1993
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (2)
5,928,329 System for automatic synchronization of common file between portable computer and host computer via communication channel selected from a plurality of usable channels therebetween 124 1997
6,317,797 System for automatic synchronization of common file between portable computer and host computer via communication channel established with user approval of charge to be incurred 61 1998
 
KABUSHIKI KAISHA TOSHIBA (2)
4,802,200 Radio telephone system control apparatus and method 36 1986
4,897,864 Control method and appartus for a radio telephone system 7 1988
 
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) (2)
4,731,812 Installation with portable, wireless telephone sets 18 1986
6,236,860 Method for performing handover and roaming in a radio communication environment 25 1998
 
APPLICATIONS ELECTRONIQUE TECHNIQUES AVANCEES "A.E.T.A." (1)
4,866,753 Telephone installation having a radio link 1 1988
 
AT&T BELL LABORATORIES (1)
5,018,187 Mobile telephone intrasystem and intersystem enhanced handoff method and apparatus for limiting trunk switching connections 24 1990
 
ERICSSON INC. (1)
5,526,402 Radio personal communications system and method for initiating communications between a base station and a cellular terminal 34 1995
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (1)
5,212,806 Distributed control methods for management of migrating data stations in a wireless communications network 88 1990
 
MOTOROLA, INC. (1)
4,737,978 Networked cellular radiotelephone systems 141 1986
 
NORTEL NETWORKS LIMITED (1)
4,771,448 Private cellular system 159 1987
 
PALM, INC. (1)
5,666,530 System for automatic synchronization of common file between portable computer and host computer via communication channel selected from a plurality of usable channels there between 314 1992
 
PLESSEY U.K. (1)
4,750,198 Cellular radiotelephone system providing diverse separately-accessible groups of channels 40 1986
 
QUALCOMM INCORPORATED (1)
5,799,254 Method and apparatus for providing a dial tone to a telephone within a wireless local loop system 31 1997
 
ROCKSTAR BIDCO, LP (1)
5,345,597 Call set-up in a radio communication system with dynamic channel allocation 35 1993
 
SANYO ELECTRIC CO., LTD. (1)
4,741,019 Cordless telephone 17 1985
 
SHARP KABUSHIKI KAISHA (1)
5,253,287 Method of operating cordless telephone system 10 1991
 
SONY CORPORATION (1)
4,768,219 Cordless telephone 29 1987
 
THOMSON CONSUMER ELECTRONICS, INC. (1)
6,041,240 Clear channel selection system for a cordless telephone 20 1997
 
VERIZON SERVICES CORP. (1)
5,751,789 SNID with wireless backup 79 1995
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (2)
4,825,456 Telephone system/paging system interface 55 1988
6,380,860 Portable wireless cellular fire alarm system apparatus and method 35 1999