Jacobus Cornelius Haartsen

Radio personal communications system and method for allocating frequencies for communications between a cellular terminal and a base station

Base station which relays cellular verification signals via a telephone wire network to verify a cellular radio telephone

Radio personal communications system and method for initiating communications between a base station and a cellular terminal

Radio personal communications system and method for selecting a frequency for use in communications between a base station and a cellular terminal

Multiple user base stations and methods for radio personal communications systems

Secure radio personal communications system and method

Automatic repeat request(ARQ) data communications method and apparatus

Data and message retrieval communications system including remote receive-only communication unit

Attribution de voies dans des systemes de communications a mobiles perfectionnes dotes de programmes fixes

Kanalzuweisung in Mobilkommunikationssystemen mit einem erweiterten festen Plan