Communication system using movable radio terminals

• US 5,333,174 A
• Filed: 03/15/1991
• Issued: 07/26/1994
• Est. Priority Date: 03/30/1990
• Status: Expired due to Fees

• Current Assignee: Small Power Communication Systems Research Laboratories Co., Ltd.
• Original Assignee: Small Power Communication Systems Research Laboratories Co., Ltd.
• Inventors: Nagasawa, Zenichiro, Sato, Risaburo
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): LOOMIS, PAUL A
• Application Number:
  US07/670,010
• Time in Patent Office: 1,229 Days
• Field of Search: 379/56, 379/58, 379/63, 379/144, 379/155, 455/31, 455/33.1, 370/50, 370/109
• US Class Current: 455/422.1
• CPC Class Codes: H04W 84/02 Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
• CPC Class Codes: H04W 84/16 WPBX [Wireless Private Branch Exchange]

Abstract

A system according to the present invention comprises a telephone switchboard 20 and first coupling distributors 17-19, which are arranged in a central telephone exchange 13, second coupling distributors 10-12 arranged in areas provided with public telephones 1-3, and connected to the first coupling distributors through transmission path 14-16, movable radio terminals 21-26, and base stations 4-6, connected to the second coupling distributors, for relaying radio signals between the radio terminals and the central station. The transmission path 14-16 are used for transmitting signals between the base stations and the central station, as well as between the public telephones and the telephone switchboard.

Claims

1. A communication system, comprising:

a public telephone;

a central telephone exchange connected to said public telephone through a telephone line;

mobile terminals;

a base station, established in an area proximate to said public telephone, for receiving and transmitting radio signals from and to said mobile terminals and for converting said received radio signals from said mobile terminals to signals to be transmitted over said telephone line to said central telephone exchange and for converting signals transmitted over said telephone line by said central telephone exchange to said base station into said transmitted radios signals;

wherein a telephone switchboard is arranged in said central telephone exchange, and the communion system further comprises;

a first coupling distributor, arranged in said central telephone exchange and connected to said telephone switchboard, for distributing a transmission path of said telephone line to at least one of the base station and said public telephone;

at least one telephone area provided with said public telephone; and

a second coupling distributor having two ends and arranged in said telephone area, one end connected to said public telephone and another end connected to said base station;

said transmission path of said telephone line being used for transmitting voice and data signals between said base station and said telephone switchboard, as well as between said public telephone and said telephone switchboard.

2. The communication system according to claim 1, further comprising:

at least one common-use center connected to a first coupling distributor through a first dedicated line; and

at least one user center connected to said at least one common-use center through a second dedicated line;

and wherein said mobile terminals are registered in said common-use center, and different kinds of signals indicative of voice and data are simultaneously transmitted between said movable radio terminals and said at least one user center.

3. The communication system according to claim 2, wherein when a plurality of calls are made during a same period by said mobile terminals, said at least one common-use center restricts a number of said movable radio terminals able to communicate with said at least one user center, and determines a priority order of the calls.