Radio connection system

• US 5,329,530 A
• Filed: 10/26/1992
• Issued: 07/12/1994
• Est. Priority Date: 10/25/1991
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Kojima, Susumu
• Primary Examiner(s): Safourek, Benedict V.
• Application Number:
  US07/966,866
• Time in Patent Office: 624 Days
• Field of Search: 370/39, 370/30, 370/85.7, 370/95.1, 370/95.3, 455/34.1, 455/34.2, 455/54.2, 455/56.1, 379/63
• US Class Current: 370/348
• CPC Class Codes: H04B 7/2643 using time-division multiple access [TDMA] H04B7/2615, H04B7/2618 take precedence
• CPC Class Codes: H04W 48/20 Selecting an access point
• CPC Class Codes: H04W 72/563 of the wireless resources

Abstract

A radio connection system capable of improving the number of successfully completed connections between base stations and mobile stations, without resorting to complicated control systems and, therefore, desirably obtaining dynamic channel assignment. A base station transmits a proposed available radio frequency to a mobile unit which has issued a connection request and then waits to receive an answer from the mobile unit in any slot timing at the proposed radio frequency. The mobile unit detects a time slot which it can use and returns an answer to the base station in that time slot.

Claims

1. An interconnection method for use with a radio connection system for a mobile communication system comprising a plurality of base stations and a plurality of mobile units connectable to said base stations over TDMA (Time Division Multiple Access) communication channels, said method comprising:

said radio base stations each assigning only a radio communication channel frequency and not assigning time slot information to one of said mobile units which has sent a connection request to the base station,

said each base station awaiting a response from the mobile unit at any time slot on said radio frequency, and assigning a time slot as a communication channel when said response is received, and

said mobile unit sensing a carrier on said radio frequency over at least one TDMA frame to find unoccupied time slots and sending said response to said base station in one of said unoccupied time slots.

2. An interconnection method for use with a radio connection system for a mobile communication system comprising a plurality of base stations and a plurality of mobile units connectable to said base stations over TDMA communication channels, said method comprising:

said radio base stations each assigning a radio communication channel frequency and an unoccupied time slot at said radio frequency to one of said mobile units which has sent a connection request to the base station,

said each base station awaiting a response from the mobile unit at any time slot on said radio frequency, and assigning a time slot as a communication channel when said response is received, and

said mobile station performing carrier-sensing on said radio frequency over at least one TDMA frame to find unoccupied time slots whether or not said time slot is unoccupied, and sending, if said time slot is unoccupied, said response to said base station in said time slot or, if said time slot is occupied, sending said response to said base station in one of said unoccupied time slots.

3. A connection method for use with a radio connection system for a mobile communication system comprising a plurality of base stations and a plurality of mobile units connectable to said base stations over TDMA communication channels, said method comprising:

said TDMA communication channels each being assigned to a respective one of said base stations and each being divided into an up-going and a down-going channel each having a plurality of time lots,

said base stations each reporting only a radio frequency to one of the said mobile units which has sent a connection request to the base station, awaiting a response from the mobile unit at said radio frequency, and assigning, as a communication channel, a time slot occurring when said response is received, and

said mobile unit detecting, when detecting unoccupied time slots after reception of a carrier of said radio frequency, time slots without a signal on both of said up-going and down-going channels, and transmitting said answer to said base station in said time slots.

4. A connection method for use with a radio connection system for a mobile communication system comprising a plurality of base stations and a plurality of mobile units connectable to said base stations over TDMA communication channels, said method comprising:

said TDMA communication channels each being assigned to a respective one of said base stations and being divided into an up-going and a down-going channel each having a plurality of time slots,

said base stations each reporting a radio frequency and an unoccupied time slot at said radio frequency to one of the said mobile units which has sent a connection request to the base station, awaiting a response from the mobile unit at said radio frequency, and assigning a time slot occurring when said answer is received as a communication channel, and

said mobile unit detecting, when detecting unoccupied time slots after receiving a carrier of said radio frequency, time slots without a signal on both of said up-going and down-going channels, and transmitting said response to said base station in said time slots.