Dynamic queuing system based on GPS

• US 5,722,081 A
• Filed: 05/21/1996
• Issued: 02/24/1998
• Est. Priority Date: 05/22/1995
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Tamura, Takakazu
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): Le, Thanh
• Application Number:
  US08/651,874
• Time in Patent Office: 644 Days
• Field of Search: 455/33.1, 455/34.1, 455/51.1, 455/51.2, 455/53.1, 455/54.1, 455/56.1, 455/67.1, 455/67.3, 455/67.6, 455/422, 455/423, 455/502, 455/503, 455/507, 455/517 , 455/524, 375/354, 375/356, 370/503, 370/507
• US Class Current: 455/502
• CPC Class Codes: H04H 20/67 Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency
• CPC Class Codes: H04W 84/022 One-way selective calling networks, e.g. wide area paging

Abstract

The object of the present invention is to perform synchronizing adjustment of reception timings of radio waves at a reception point without the necessity of an approach line and a receiving station from an exchange to a receiver and without being influenced by a condition of approach lines to all radio base stations. Exchange 10 is connected to GPS 20 and includes, in the inside thereof, approach line supervision unit 75 for supervising a condition of the approach lines and calculating transmission delay times from the condition of the approach lines, transmission time setting unit 15 for setting a time at which transmission radio waves should arrive at an overlap zone, data base 30 in which position information of the overlap zone is stored, and a controller 35 for transmitting information to the radio base stations. Radio base station 40-1 is connected to GPS 50-1 and includes, in the inside thereof, controller 46-1 for outputting a transmission message, and delay calculation unit 45-1 for calculating a radio wave arrival time from a transmitter to the overlap zone.

Claims

1. A dynamic queuing system based on a GPS comprising:

an exchange having a GPS apparatus, and a plurality of radio base stations connected to said exchange through respective approach lines and each having a GPS apparatus, wherein

said exchange includes

approach line supervision means for supervising the condition of said respective approach lines,

transmission time setting means for determining a transmission request time at which transmission radio waves from said radio base stations should arrive at an overlap zone between said radio base stations based on information from said GPS apparatus of said exchange and said approach line supervision means,

information storage means in which position information of said overlap zone is stored, and

first control means for adding information outputted from said transmission time setting means and said information storage means to a transmission message and transmitting the transmission message with the information to said radio base stations, and wherein

each of said radio base stations includes

delay calculation means for calculating, based on the position information of said overlap zone, a transmission time of a transmission signal to said overlap zone, and

second control means for transmitting a signal at a time earlier than the transmission request time by the transmission time.

2. A dynamic queuing system based on a GPS according to claim 1 wherein:

said first and second means have a storage function.

3. A dynamic queuing system based on a GPS according to claim 1 or 2, wherein:

the information regarding the transmission request time and said overlap zone is added to a header of and transmitted together with the transmission message.

4. A dynamic queuing system based on a GPS according to claim 1 or 2, wherein:

the transmission request time is obtained by adding a maximum value among times required when a transmission signal sent out from said exchange arrives at said overlap zone through a plurality of the said radio base stations to the transmission time for radio waves received from said exchange.

5. A dynamic queuing system based on a GPS according to claim 3, wherein the information regarding the transmission request time and said overlap zone is added to a header of and transmitted together with the transmission message.