Time division multiple access mobile wireless telecommunication system

• US 5,586,122 A
• Filed: 12/07/1994
• Issued: 12/17/1996
• Est. Priority Date: 12/10/1993
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd., Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Hitachi, Ltd., Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Ishida, Kazuhito, Horikawa, Izumi, Suzuki, Toshiro, Harakawa, Takao
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Patel, Ajit
• Application Number:
  US08/350,664
• Time in Patent Office: 741 Days
• Field of Search: 370/95.1, 370/95.3, 370/110.1, 370/98, 370/111, 370/85.6, 455/33.1, 455/54.1, 455/54.2, 455/58.1, 379/59, 379/60
• US Class Current: 370/347
• CPC Class Codes: H04J 4/00 Combined time-division and frequency-division multiplex systems H04J13/00 takes precedence ; data transmission H04L5/26; telemetry G08C15/00
• CPC Class Codes: H04W 48/10 using broadcasted information
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]

Abstract

In a time division multiple access mobile wireless telecommunication system, a base station has a plurality of frequencies with their priority order previously registered in a memory, selects, upon starting the operation, the frequency having the highest priority from frequencies not used by other wireless telecommunication systems, and initiates communications at the selected frequency. The base station also transmits a pilot signal representative of the priority for using the selected frequency in order to prevent other wireless telecommunication system from interrupting to use the frequency.

Claims

1. A time division multiple access mobile wireless telecommunication system comprising a plurality of personal stations and at least one base station, wherein:

said base station includes;

a memory in which a plurality of frequencies are registered with previously determined priority order;

frequency channel selecting means for selecting, from the frequencies registered in said memory, frequency which is not being utilized by any other wireless telecommunication system and has the highest priority, when said base station starts communication;

means for generating a pilot signal for claiming the priority for utilizing said selected frequency;

means for generating a common control signal for controlling said wireless telecommunication system;

means for inserting the pilot signal from said pilot signal generating means and the common control signal from said common control signal generating means respectively at intervals of a predetermined period, using said selected frequency, and for transmitting said pilot signal and said common control signal together with a communication signal to be transmitted, and

each of said personal stations includes;

means for receiving said pilot signal, said common control signal and said communication signal from said base station, said means for receiving operating in response to at least one of said common control signal and said pilot signal.

2. A system according to claim 1, wherein a plurality of said base stations are arranged to form a cluster.

3. A system according to claim 2, wherein said frequency channel selecting means further comprises:

system determining means for determining, when detecting the same frequency as that of a selected frequency channel, whether or not the selected frequency channel is a frequency channel assigned to the wireless telecommunication system to which the base station belongs, based on said common control signal and said pilot signal; and

means for determining an empty time slot for communications of the base station when said system determining means determines that the selected frequency channel is assigned to the wireless telecommunication system to which the base station belongs.

4. A system according to claim 1, wherein:

a communication frame of said wireless telecommunication system is divided into a plurality of sub-frames, and a carrier sense time in said frequency channel selecting means is set to be shorter than a period of said communication frame and at least as long as a period of one of said sub-frames.

5. A system according to claim 4, wherein:

each of said sub-frames includes a plurality of time slots, and said pilot signal is inserted into at least one time slot in every predetermined number of said sub-frames.