Antenna system for a cellular telephone network

• US 6,434,406 B2
• Filed: 12/05/2000
• Issued: 08/13/2002
• Est. Priority Date: 04/02/1991
• Status: Expired due to Term

• Current Assignee: Cellco Partnership, Inc. (Verizon Communications Inc.)
• Original Assignee: Cellco Partnership, Inc. (Verizon Communications Inc.)
• Inventors: Lee, William Chien-Yeh
• Primary Examiner(s): LE, THANH C
• Application Number:
  US09/731,324
• Publication Number:
  US 20010003096A1
• Time in Patent Office: 616 Days
• Field of Search: 455/426, 455/436, 455/432, 455/433, 455/434, 455/435, 455/450, 455/452, 455/56, 455/562, 370/329, 370/331, 370/334
• US Class Current: 455/562.1
• CPC Class Codes: H04B 7/022 Site diversity; Macro-diversity using two or more spaced independent antennas H04B7/04
• CPC Class Codes: H04B 7/0491 using two or more sectors, i.e. sector diversity
• CPC Class Codes: H04B 7/0802 using antenna selection H04B7/0868 takes precedence; antenna beam directivity switching H01Q3/24
• CPC Class Codes: H04B 7/0837 using pre-detection combining H04B7/0868 takes precedence
• CPC Class Codes: H04B 7/26 at least one of which is mobile
• CPC Class Codes: H04W 16/00 Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
• CPC Class Codes: H04W 16/12 Fixed resource partitioning
• CPC Class Codes: H04W 16/24 Cell structures
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 16/32 Hierarchical cell structures
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/0466 the resource being a scrambling code
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A cellular telephone system is described of the type wherein a plurality of contiguous cells, each having an assigned set of identification codes, are arranged with means for maintaining continuous communication with mobile telephones moving from cell to cell. The system allows multiple access by including means for assigning at least one of the in the assigned set of identification codes to more than one mobile telephone. A unique identification code is assigned to a mobile telephone located in the cell. A signal having a unique identification code is generated for identifying the mobile telephone. The signal is coupled to the zones. A combiner is also provided for combining signals from all of the zones in the cell. A receiver is coupled to the combiner for retrieving the signals having the code. According to another aspect of the invention, the signal coupled to the zones is delayed so that the transmission of the signal among the plurality of antenna sets is delayed by a preselected amount so as to reduce interference caused by successive reception of signals.

Claims

1. A cellular telephone system, wherein the cellular telephone system comprises a plurality of cells, each of the cells being comprised of at least one zone, comprising:

each of the cells including a plurality of antennae coupled to a cell-site transceiver for transmitting and receiving radio frequency (RF) signals for communicating with the cellular transceivers within the cell, wherein each of the cellular transceivers uses a different identification code but an identical assigned frequency for encoding and transmitting the RF signals, respectively;

each of the cells including a combiner, coupled to the antennae, for maintaining communication with the cellular transceivers by selectively coupling the cell-site transceiver to a first set of the antennae for communicating with the cellular transceivers in a first one of the zones and selectively coupling the cell-site transceiver to a second set of the antennae for communicating with the cellular transceivers in a second one of the zones, as the cellular transceivers move from the first one of the zones to the second one of the zones within the cell and as the cellular transceivers move from the second one of the zones to the first one of the zones within the cell; and

each of the cells including a controller, coupled to the antennae and to the combiner, for maintaining communications with the cellular transceivers by changing the identification codes for the cellular transceivers as they move from the cell to another cell and as they move from another cell to the cell.

2. The system of claim 1, wherein the first set of the antennae is located in the first one of the zones and a second set of the antennae is located in the second one of the zones.

3. The system of claim 1, wherein the first set of the antennae and the second set of the antennae comprise identical ones of the antennae.

4. The system of claim 1, wherein the first set of the antennae and the second set of the antennae comprise different ones of the antennae.

5. The system of claim 1, wherein the combiner selectively couples more than one of the antennae in the cell to the cell-site transceiver.

6. The system of claim 1, wherein the combiner selectively couples more than one of the antennae in each of the zones to the cell-site transceiver.

7. The system of claim 1, wherein the antennae are located within the cell.

8. The system of claim 7, wherein the antennae are located on a periphery of the cell and are positioned to substantially limit propagation of the RF signals to the cell.

9. The system of claim 7, wherein the antennae are located in one or more of the zones.

10. The system of claim 9, wherein the antennae are located on a periphery of the zone and are positioned to substantially limit propagation of the RF signals to the zone.

11. The system of claim 9, wherein the zones are arranged in a manner that creates linear coverage for the cell.

12. The system of claim 1, wherein the combiner includes a monitor for measuring one or more characteristics of the RF signal received by the antennae and for selectively coupling the cell-site transceiver to the antennae based on the measured characteristics.

13. A method for communicating within a cellular telephone system, comprising:

dividing a region into a plurality of cells and dividing each cell into one or more zones, wherein each of the cells includes a plurality of antennae coupled to a cell-site transceiver for transmitting and receiving radio frequency (RF) signals for communicating with the cellular transceivers within the cell, and each of the cellular transceivers uses a different identification code but an identical assigned frequency for encoding and transmitting the RF signals, respectively;

maintaining communication with the cellular transceivers by selectively coupling the cell-site transceiver to a first set of the antennae for communicating with the cellular transceivers in a first one of the zones and selectively coupling the cell-site transceiver to a second set of the antennae for communicating with the cellular transceivers in a second one of the ones, as the cellular transceivers move from the first one of the zones to the second one of the zones within the cell and as the cellular transceivers move from the second one of the zones to the first one of the zones within the cell; and

maintaining communications with the cellular transceivers by changing the identification codes for the cellular transceivers as they move from the cell to another cell and as they move from another cell to the cell.

14. The method of claim 13, wherein the first set of the antennae is located in the first one of the zones and a second set of the antennae is located in the second one of the zones.

15. The method of claim 13, wherein the first set of the antennae and the second set of the antennae comprise identical ones to the antennae.

16. The method of claim 13, wherein the first set of the antennae and the second set of the antennae comprise different ones of the antennae.

17. The method of claim 13, wherein the maintaining step (b) comprises selectively coupling more than one of the antennae in the cell to the cell-site transceiver.

18. The method of claim 13, wherein the maintaining step (b) comprises selectively coupling more than one of the antennae in each of the zones to the cell-site transceiver.

19. The method of claim 13, wherein the antennae are located within the cell.

20. The method of claim 19, wherein the antennae are located on a periphery of the cell and the positioned to substantially limit propagation of the RF signals to the cell.

21. The method of claim 19, wherein the antennae are located in one or more of the zones.

22. The method of claim 21, wherein the antennae are located on a periphery of the zone and are positioned to substantially limit propagation of the RF signals to the zone.

23. The method of claim 21, wherein the zones are arranged in a manner to create linear coverage for the cell.

24. The method of claim 13, maintaining step (b) further comprises measuring one or more characteristics of the RF signal received by the antennae and selectively coupling the cell-site transceiver to the antennae based on the measured characteristics.