Three-cell wireless communication system

• US 5,402,413 A
• Filed: 04/08/1991
• Issued: 03/28/1995
• Est. Priority Date: 04/08/1991
• Status: Expired due to Term

• Current Assignee: Intel Corporation
• Original Assignee: Omnipoint Corp. (Deutsche Telekom AG)
• Inventors: Dixon, Robert C.
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): FAILE, ANDREW I
• Application Number:
  US07/682,050
• Time in Patent Office: 1,450 Days
• Field of Search: 455/33.1, 455/33.2, 455/33.4, 455/54.1, 455/56.1, 379/59, 379/60, 375/1, 370/18, 370/95.1, 370/95.3
• US Class Current: 370/335
• CPC Class Codes: H04B 2201/70702 Intercell-related aspects
• CPC Class Codes: H04J 13/16 Code allocation
• CPC Class Codes: H04W 16/02 Resource partitioning among network components, e.g. reuse partitioning
• CPC Class Codes: H04W 16/12 Fixed resource partitioning

Abstract

A wireless communication system including a repeated pattern of cells, in which base station transmitters and user station transmitters for each cell may be assigned a spread-spectrum code for modulating radio signal communication in that cell. Radio signals used in that cell are spread across a bandwidth sufficiently wide that both base station receivers and user station receivers in an adjacent cell may distinguish communication which originates in one cell from another. Adjacent cells may use distinguishable frequencies and distinguishable codes, but it is sufficient if adjacent cells use distinguishable frequencies and identical codes. A repeated pattern of cells allows the codes each to be reused in a plurality of cells.

Claims

1. A time division multiple access wireless communication system, comprising

a repeated pattern of three cells, each cell having a base station;

and

a user station;

wherein said base station and said user station communicate using time division multiple access;

wherein transmitters in a first cell are assigned a first spread-spectrum code for modulating radio communication in said first cell;

whereby radio signals used in said first cell are spread across a bandwidth sufficiently wide that receivers in a second cell, said second cell being adjacent to said first cell, may distinguish communication which originates in said first cell from communication which originates in said second cell; and

whereby said first spread-spectrum code is reused in a plurality of cells such that said first cell in said pattern using said first spread-spectrum code is not adjacent to any other cell using said first spread-spectrum code.

2. A time division multiple access wireless communication system as in claim 1, wherein said repeated pattern comprises a configuration which is repeated along three mutually orthogonal axes.

3. A time division multiple access wireless communication system as in claim 1, wherein said user station transmitters emit data communication messages which include station identification information.

4. A time division multiple access wireless communication system as in claim 1, wherein said codes are assigned dynamically for each cell.

8. A time division multiple access wireless communication system as in claim 1, wherein said codes comprise a set of codes with minimal cross-correlation attributes.

16. A time division multiple access wireless communication system as in claim 1, wherein said repeated pattern consists essentially of three classes of cells.

17. A time division multiple access wireless communication system as in claim 1, wherein said repeated pattern consists essentially of a first class of cells, a second class of cells, and a third class of cells;

wherein no member of said first class is adjacent to another member of said first class, no member of said second class is adjacent to another member of said second class, and no member of said third class is adjacent to another member of said third class;

said first class being assigned a first spread-spectrum code, said second class being assigned a second spread-spectrum code, and said third class being assigned a third spread-spectrum code.

5. A time division multiple access wireless communication system, comprising

a repeated pattern of cells, each cell having a base station;

and

a user station;

wherein said base station and said user station communicate using time division multiple access;

wherein transmitters in a first cell are assigned a first spread-spectrum code for modulating radio communication in said first cell;

whereby radio signals used in said first cell are spread across a bandwidth sufficiently wide that receivers in a second cell, said second cell being adjacent to said first cell, may distinguish communication which originates in said first cell from communication which originates in said second cell;

whereby said first spread-spectrum code is reused in a plurality of cells such that said first cell in said pattern using said first spread-spectrum code is not adjacent to any other cell using said first spread-spectrum code; and

wherein said codes are assigned dynamically for each cell by each of a plurality of independent communication systems, after accounting for use by other systems.

6. A time division multiple access wireless communication system as in claim 5, wherein said use is concurrent use.

7. A time division multiple access wireless communication system as in claim 5, wherein said use is prior use.

9. A time division multiple access wireless communication system as in claim 6,

wherein said codes comprise a limited number of predetermined codes;

and

wherein said repeated pattern consists essentially of three classes of cells.

10. A time division multiple access wireless communication system as in claim 9, wherein said limited number is three.

11. A time division multiple access wireless communication system as in claim 9, further comprising means for frequency division in said base stations.

12. A time division multiple access wireless communication system as in claim 11, wherein a plurality of frequencies are assigned dynamically.

13. A time division multiple access wireless communication system as in claim 11, wherein a plurality of frequencies are assigned dynamically by each of a plurality of independent communication systems, after accounting for use by other systems.

14. A time division multiple access wireless communication system as in claim 13, wherein said use is concurrent use.

15. A time division multiple access wireless communication system as in claim 13, wherein said use is prior use.