Cellular networks with spare base and satellite stations

• US 5,991,629 A
• Filed: 10/14/1997
• Issued: 11/23/1999
• Est. Priority Date: 10/14/1997
• Status: Expired due to Term

• Current Assignee: AT&T Corporation (AT&T, Inc.)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Rudrapatna, Ashok N., Agrawal, Prathima
• Primary Examiner(s): LOOMIS, PAUL A
• Application Number:
  US08/943,291
• Time in Patent Office: 770 Days
• Field of Search: 455/446, 455/445, 455/453, 455/436, 455/441, 455/422, 455/426, 455/432
• US Class Current: 455/446
• CPC Class Codes: H04W 16/06 Hybrid resource partitioning, e.g. channel borrowing
• CPC Class Codes: H04W 52/0225 using monitoring of external events, e.g. the presence of a signal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A cellular network includes a control station and a network of base stations installed one per cell with which one or more mobile stations can communicate as they roam through a cell. Redundantly deployed spare base stations are introduced along with the primary base station at a central area of each cell. The redundantly deployed spare base stations handle new calls when the associated primary base station is overloaded, participate in retransmission of data lost due to degraded channel conditions and congestion in the network, and assist in handoffs. Primary and spare satellite stations are deployed in regions marked by hills or valleys to augment the communicative capabilities of the primary and spare base stations.

Claims

1. A cellular network, comprising:

a network of cells through which one or more mobile stations can move;

a control station communicatively coupled to the network of cells;

a primary base station, which can communicate with one or more of the mobile stations, deployed in each of the network of cells;

a spare base station, which can communicate with one or more of the mobile stations, deployed in each of the network of cells;

a primary satellite station, which augments the primary and spare base stations, deployed to cover a region within the network of cells; and

a spare satellite station, which augments the primary satellite station, deployed in said region.

2. A cellular network as defined in claim 1, further comprising:

a programmable processor within the control station, wherein said processor is programmed to execute the step of;

assigning a call associated with a mobile station from one of the primary base stations to one of the spare base stations.

3. A cellular network as defined in claim 1, further comprising:

a memory within the control station.

4. A cellular network as defined in claim 3, further comprising:

a control program stored in the memory.

5. A cellular network as defined in claim 3, wherein:

the memory comprises an assignment buffer, a primary base station handoff buffer for each deployed primary base station, and a spare base station handoff buffer for each deployed spare base station.

6. A cellular network as defined in claim 4, wherein said control program comprising a set of instructions, which when performed by a processor, cause the processor to execute a series of steps comprising:

assigning a call associated with a mobile station from one of the primary base stations to one of the spare base stations.

7. A cellular network as defined in claim 1, wherein:

the primary and spare base stations are deployed in a central area of each of the network of cells.

8. A cellular network as defined in claim 1, wherein:

said region is defined by a plurality of the network of cells.

9. A method of routing a call, for use in a cellular network comprising a network of cells having a primary base station deployed in each of the network of cells, the method comprising the steps of:

deploying a spare base station along with each primary base station in a central area of each of the network of cells;

monitoring a call assigned to a particular one of the primary base stations and associated with a mobile station;

issuing a warning that the mobile station will cross a boundary between cells of the network; and

changing the assignment of said call from said particular one of the primary base stations to a particular spare base station based on the warning.

10. A method as defined in claim 9, further comprising the step of:

determining the position and velocity of the mobile station.

11. A method as defined in claim 9, further comprising the step of:

determining the assignment of the call based on a signal level and a bit error rate.

12. A method as defined in claim 9, further comprising the step of:

receiving a report from a spare base station deployed in one of the network of cells.

13. A method as defined in claim 9, further comprising the step of:

changing the assignment of the call from said particular spare base station to a second primary base station.

14. A method as defined in claim 9, further comprising the step of:

deploying at least one spare base station in each of the network of cells.

15. A method as defined in claim 9, further comprising the step of:

deploying a primary satellite station to cover a region within the network of cells, said primary satellite station augmenting the primary and spare base stations deployed in the network of cells.

16. A method as defined in claim 15, further comprising the step of:

deploying a spare satellite station in said region, said spare satellite station augmenting said primary satellite station.

17. A method as defined in claim 9, wherein:

a plurality of spare base stations are deployed in one cell.

18. A method as defined in claim 9, wherein:

a plurality of spare satellite stations are deployed per cell.

19. A method as defined in claim 9, wherein:

a plurality of primary base stations are covered by a lesser number of spare base stations.

20. A method as defined in claim 9, wherein:

a plurality of primary satellite stations are covered by a lesser number of spare satellite stations.