Portable cellular telephone using spread spectrum communication with mobile transceiver

• US 5,351,270 A
• Filed: 05/20/1993
• Issued: 09/27/1994
• Est. Priority Date: 05/20/1993
• Status: Expired due to Fees

• Current Assignee: Alcatel USA Sourcing L.P. (Nokia Corporation)
• Original Assignee: Stanford Telecommunications, Inc. (Nokia Corporation)
• Inventors: Schuchman, Leonard, Moses, Charles, Graham, Hatch, Bruno, Ronald
• Primary Examiner(s): Gregory, Bernarr E.
• Application Number:
  US08/064,629
• Time in Patent Office: 495 Days
• Field of Search: 375/1, 380/34, 379/56, 379/58-61, 455/33.1, 455/53.1, 455/54.1, 455/56.1
• US Class Current: 375/130
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

A portable cellular telephone system including a stationary transceiver for radio communication with a plurality of mobile transceivers within a geographic cell, a mobile transceiver within said geographic cell and having sufficient power to communicate with said stationary transceiver, and a portable transceiver of limited size for personal transport and use. The portable transceiver communicates with the mobile transceiver by spread spectrum techniques, and the mobile transceiver communicates with the stationary transceiver by frequency modulated radio transmission or by digital radio transmission.

Claims

1. A portable cellular telephone system comprising:

a stationary transceiver for radio communication with a plurality of mobile transceivers within a geographic cell;

a mobile transceiver within said geographic cell and having sufficient power to communicate with said stationary transceiver; and

a portable transceiver for personal transport and use, said portable transceiver having sufficient power for radio communication with said mobile transceiver when located within a limited distance of said mobile transceiver but insufficient power to communicate directly with said stationary transceiver, said mobile transceiver providing a radio link between said portable transceiver and said stationary transceiver,

said portable transceiver communicating with said mobile transceiver by spread spectrum communication using frequency bands allocated for unlicensed use.

2. The portable cellular telephone system as defined by claim 1 wherein said mobile transceiver communicates with said stationary transceiver by frequency modulation communication.

3. The portable cellular telephone system as defined by claim 1 wherein said mobile transceiver communicates with said stationary transceiver by digital radio communication.

4. In a portable cellular telephone system, a method of radio communication between a portable hand-held transceiver and a stationary transceiver in a geographic cell comprising the steps of:

providing an intermediate mobile transceiver within a limited distance of said portable transceiver for communicating with said portable transceiver and having sufficient power to communicate with said transceiver;

transmitting first radio waves between said mobile transceiver and portable transceiver; and

transmitting second radio waves between said mobile transceiver and said stationary transceiver by spread spectrum broadcast using frequency bands allocate for unlicensed use, whereby information transmitted from said portable transceiver is received by said mobile transceiver and retransmitted to said stationary transceiver.

5. The method as defined by claim 4 wherein said second radio waves are transmitted by frequency modulated broadcast.

6. The method as defined by claim 4 wherein said second radio waves are transmitted by digital radio broadcast.