Mobile communication system

• US 5,159,596 A
• Filed: 06/26/1990
• Issued: 10/27/1992
• Est. Priority Date: 06/26/1989
• Status: Expired due to Fees

• Current Assignee: Iwatsu Electric Company Limited
• Original Assignee: Iwatsu Electric Company Limited
• Inventors: Itoh, Sadao
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Jung, Min
• Application Number:
  US07/543,560
• Time in Patent Office: 854 Days
• Field of Search: 370/50, 370/95.1, 370/95.3, 370/109, 379/60, 379/63, 455/33, 455/56, 455/33.1, 455/33.4
• US Class Current: 370/329
• CPC Class Codes: H04B 7/2643 using time-division multiple access [TDMA] H04B7/2615, H04B7/2618 take precedence
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 28/16 Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 74/085 collision avoidance
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: H04W 88/16 Gateway arrangements
• CPC Class Codes: H04W 92/02 Inter-networking arrangements

Abstract

A mobile communication system based on a time division communication system comprising: mobile radio units for transmitting and receiving time-compressed and segmented signals by a radio channel allocated to time slots; radio base stations to which a communicable time slot is previously allocated so as to communicate using only a specific time slot of those time slots of the radio channel when the mobile radio units moves across one of service areas that are disposed so as to overlap at least partially with one another, the time slot allocated to one radio base station being different from that allocated to another radio base station; and gateway exchange units for exchanging communications between the mobile radio units and the radio base stations and for connecting the radio base stations to a public switched telephone network.

Claims

1. A mobile communication system using a time division communication system, comprising:

mobile radio means for transmitting and receiving timecompressed and segmented signals through a radio channel allocated to a plurality of time slots;

a plurality of radio base stations each having a service area which is disposed to overlap at least partially with one another, each of said radio base stations being provided with a predetermined communicable time slot previously allocated thereto so as to communicate with said mobile radio means using only a specific time slot of said time slots of said radio channel when said mobile radio means moves across one of said service areas, said predetermined communicable time slot allocated to one of said radio base stations being different from that allocated to the other radio base stations adjacent thereto; and

gateway exchange means for exchanging communications between said mobile radio means and said radio base stations and for connecting said radio base stations to a public switched telephone network.

2. A mobile communication system according to claim 1, in which said gateway exchange means generates a synchronous signal, and said time slots transmitted through said radio channel are synchronized with said synchronous signal.

3. A mobile communication system according to claim 1, in which said radio base station sends a radio signal by using only the time slot allocated to said radio base station.