Frequency hopping code division multiple access system and method

• US 5,459,759 A
• Filed: 08/29/1994
• Issued: 10/17/1995
• Est. Priority Date: 02/17/1993
• Status: Expired due to Term

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Schilling, Donald L.
• Primary Examiner(s): Swann, Tod R.
• Application Number:
  US08/297,449
• Time in Patent Office: 414 Days
• Field of Search: 455/33.1, 455/33.4, 379/59, 380/34, 375/1, 375/202
• US Class Current: 375/133
• CPC Class Codes: H04B 1/7156 Arrangements for sequence synchronisation
• CPC Class Codes: H04B 7/0857 using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
• CPC Class Codes: H04B 7/2634 for channel frequency control
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713
• CPC Class Codes: H04W 16/02 Resource partitioning among network components, e.g. reuse partitioning
• CPC Class Codes: H04W 16/12 Fixed resource partitioning
• CPC Class Codes: H04W 16/24 Cell structures
• CPC Class Codes: H04W 16/30 Special cell shapes, e.g. doughnuts or ring cells
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/51 based on terminal or device properties
• CPC Class Codes: H04W 74/00 Wireless channel access
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A frequency-hopping-communications system, assigned a system bandwidth B, with the system bandwidth B divided into N sets of frequencies, with each set of the N sets of frequencies not having the same frequencies as other sets of the N sets of frequencies, for communicating base-message data to a plurality of remote units. The frequency-hopping-communications system includes a plurality of base stations for communicating base-message data to the plurality of remote units. Each of the base stations has a coverage area divided into a plurality of N concentric regions which are divided into a plurality of N sectors, with each sector of each concentric region assigned one of the N sets of frequencies. For communicating with a selected-remote unit located within a particular sector of a particular-concentric region, each base station has a modulator for converting the base-message data to a form suitable for sending over radio waves, a frequency-hopping device for frequency hopping the converted-base-message data over a set of frequencies assigned to the particular sector of the particular-concentric region, thereby generating a frequency-hopped signal, a controller, responsive to the selected-remote unit being located in the particular sector of the particular-concentric region, for controlling the set of frequencies used by the frequency-hopping device, a power amplifier for amplifying the frequency-hopped signal from the base station to the remote unit, and a base antenna coupled to the power amplifier for radiating the frequency-hopped signal. Each of the remote units has a receiver for recovering from the frequency-hopped signal the base-message data.

Claims

1. A frequency-hopping-communications system, assigned a system bandwidth B, with the system bandwidth B divided into N sets of frequencies, with each set of the N sets of frequencies not having the same frequencies as other sets of the N sets of frequencies, for communicating base-message data to a plurality of remote units, said frequency-hopping-communications system comprising:

a plurality of base stations for communicating base-message data to the plurality of remote units, each of said plurality of base stations having a coverage area divided into a plurality of N concentric regions with each concentric region divided into a plurality of N sectors, with each sector of each concentric region assigned one of the N sets of frequencies, each of said plurality of base stations for communicating with a selected-remote unit located within a particular sector of a particular-concentric region, including,

base-modulator means for converting the base-message data to a form suitable for sending over radio waves;

base-hopping means for frequency hopping the converted-base-message data over a set of frequencies assigned to the particular sector of the particular-concentric region, thereby generating a frequency-hopped signal;

base-power means for amplifying the frequency-hopped signal;

a base antenna coupled to said base-power means for radiating the frequency-hopped signal from each of said plurality of base stations to said selected-remote unit, said base antenna including means for sectoring the coverage area into the plurality of N sectors; and

base-controller means, responsive to said selected-remote unit located within the particular sector of the particular-concentric region, for controlling the set of frequencies used by said base-hopping means for communicating with said selected-remote unit;

each of said plurality of remote units including,

a remote antenna; and

remote-receiver means for recovering from the frequency-hopped signal the base-message data.

2. The frequency-hopping-communications system as set forth in claim 1, wherein said remote-receiver means includes:

remote-acquisition-and-tracking means for acquiring and tracking the frequency-hopped signal, thereby generating a dehopped signal; and

remote-demodulator means, coupled to said remote-acquisition-and-tracking means, for demodulating the dehopped signal into the base-message data.

3. The frequency-hopping-communications system as set forth in claim 1 wherein:

said base-antenna means includes means for sectoring the coverage area into a plurality of sectors; and

said base-controller means, responsive to the selected-remote unit being located within a particular sector and the particular geographic region, controls the set of frequencies used by said base-hopping means for communicating with said selected-remote unit.

4. The frequency-hopping-communications system as set forth in claim 3 wherein said remote-receiver means includes:

remote-acquisition-and-tracking means for acquiring and tracking the frequency-hopped signal, thereby generating a dehopped signal; and

remote-demodulator means, coupled to said remote-acquisition-and-tracking means, for demodulating the dehopped signal into the base-message data.

5. The frequency-hopping-communications system as set forth in claim 1, further including forward-power means, responsive to the selected-remote unit being located within the particular-concentric region for controlling a power level of said base-power means for communicating with said selected-remote unit.

6. A frequency-hopping-communications system, assigned a system bandwidth B, with the system bandwidth B divided into N sets of frequencies, with each set of the N sets of frequencies not having the same frequencies as other sets of the N sets of frequencies, for communicating base-message data to a plurality of remote units, said frequency-hopping-communications system comprising:

a plurality of base stations for communicating base-message data to the plurality of remote units, each of said plurality of base stations having a coverage area divided into a plurality of N concentric regions with each concentric region divided into a plurality of N sectors, with each sector of each concentric region assigned one of the N sets of frequencies, each of said plurality of base stations for communicating with a selected-remote unit located within a particular sector of a particular-concentric region, including,

a base modulator for converting the base-message data to a form suitable for sending over radio waves;

a base hopping device, coupled to said base modulator, for frequency hopping the converted-base-message data over a set of frequencies assigned to the particular sector of the particular-concentric region, thereby generating a frequency-hopped signal;

a base controller, coupled to said base-hopping device and responsive to said selected-remote unit being located in the particular sector of the particular-concentric region, for controlling the set of frequencies used by said base-hopping device;

a base-power amplifier for amplifying the frequency-hopped signal; and

a base antenna including sectoring means for dividing the plurality of N concentric regions into the plurality of N sectors, said base antenna coupled to said base-power amplifier for radiating the frequency-hopped signal from each of said plurality of base stations to said selected-remote unit;

each of said plurality of remote units including,

a remote antenna; and

a remote receiver coupled to said remote antenna for recovering from the frequency-hopped signal the base-message data.

7. The frequency-hopping-communications system as set forth in claim 6, wherein said remote receiver includes:

a remote-acquisition-and-tracking circuit for acquiring and tracking the frequency-hopped signal, thereby generating a dehopped signal; and

a remote demodulator, coupled to said remote-acquisition-and-tracking circuit, for demodulating the dehopped signal into the base-message data.

8. The frequency-hopping-communications system as set forth in claim 6 wherein:

said base antenna includes means for sectoring the coverage area into a plurality of sectors; and

said base controller, responsive to the selected-remote unit being located within a particular sector and the particular geographic region, controls the set of frequencies used by said base-hopping for communicating with said selected-remote unit.

9. The frequency-hopping-communications system as set forth in claim 8 wherein said remote receiver includes:

a remote-acquisition-and-tracking circuit for acquiring and tracking the frequency-hopped signal, thereby generating a dehopped signal; and

a remote demodulator, coupled to said remote-acquisition-and-tracking circuit, for demodulating the dehopped signal into the base-message data.

10. The frequency-hopping-communications system as set forth in claim 6 further including forward-power means, responsive to the selected-remote unit being located within the particular-concentric region for controlling a power level of said base-power means for communicating with said selected-remote unit.

11. A frequency-hopping-communications method, assigned a system bandwidth B, with the system bandwidth B divided into N sets of frequencies, with each set of the N sets of frequencies not having the same frequencies as other sets of the N sets of frequencies, for communicating base-message data to a plurality of remote units, said frequency-hopping-communications method comprising the steps of:

communicating from a plurality of base stations base-message data to the plurality of remote units, each of said plurality of base stations having a coverage area divided into a plurality of N concentric regions with each concentric region divided into a plurality of N sectors, with each sector of each concentric region assigned one of the N sets of frequencies, each of said plurality of base stations for communicating with a selected-remote unit located within a particular sector of a particular-concentric region, including the steps of,

converting the base-message data to a form suitable for sending over radio waves;

frequency hopping the converted-base-message data over a set of frequencies assigned to the particular sector of the particular-concentric region, thereby generating a frequency-hopped signal;

controlling, in response to said selected-remote unit being located in the particular sector of the particular-concentric region, the set of frequencies used by each of said plurality of base stations;

amplifying the frequency-hopped signal;

transmitting the frequency-hopped signal from each of said plurality of base stations to said selected-remote unit;

receiving the frequency-hopped signal at said selected-remote unit; and

recovering, from the frequency-hopped signal, the base-message data.

12. The frequency-hopping-communications method as set forth in claim 11, wherein the step of receiving includes the steps of:

acquiring and tracking the frequency-hopped signal, thereby generating a dehopped signal; and

demodulating the dehopped signal into the base-message data.

13. The frequency-hopping-communications method as set forth in claim 11 further including the steps of:

sectoring the coverage area into a plurality of sectors; and

controlling, in response to the selected-remote unit being located within a particular sector and the particular geographic region, the set of frequencies for communicating with said selected-remote unit.

14. The frequency-hopping-communications method as set forth in claim 13 wherein the step of receiving includes the steps of:

acquiring and tracking the frequency-hopped signal, thereby generating a dehopped signal; and

demodulating the dehopped signal into the base-message data.

15. The frequency-hopping-communications method as set forth in claim 11 further including the step of controlling, in response to the selected remote unit being located within the particular-concentric region, a power level of said base station for communicating with said remote unit.

16. A frequency-hopping-communications system for communicating base-message data to a plurality of remote units, said frequency-hopping-communications system comprising:

a plurality of base stations for communicating base-message data to the plurality of remote units using a system bandwidth B, with the system bandwidth B divided into N sets of frequencies, with each set of the N sets of frequencies having frequencies different from frequencies in other sets of the N sets of frequencies, each of said plurality of base stations having a coverage area divided into a plurality of M sectors, with each of said plurality of M sectors divided into a plurality of N concentric regions, with each concentric region of each of said plurality of M sectors assigned one of the N sets of frequencies for communicating with a particular base station without frequency reuse within each of said plurality of M sectors, each of said plurality of base stations for communicating with a selected-remote unit located within a particular concentric region of a particular sector, each of said plurality of base stations including,

base-modulator means for converting the base-message data to a form suitable for sending over radio waves;

base-hopping means for frequency hopping the converted-base-message data over a set of frequencies assigned to the particular-concentric region of the particular sector, thereby generating a frequency-hopped signal using concentric-region-specific frequencies;

base-power means for amplifying the frequency-hopped signal;

a plurality of M-sector base antennas, coupled to said base-power means, for radiating the frequency-hopped signal from each of said plurality of base stations to said selected-remote unit, each of said plurality of M-sector base antennas for radiating to a specific sector of the plurality of M sectors, with a number of the plurality of M-sector base antennas being equal to a number of the plurality of M sectors; and

base-controller means, responsive to said selected-remote unit located within the particular-concentric region of the particular sector, for controlling the set of frequencies used by said base-hopping means for communicating with said selected-remote unit, with the set of frequencies having frequencies different from other sets of frequencies used in other concentric regions within the particular sector;

each of said plurality of remote units including,

a remote antenna; and

remote-receiver means for recovering from the frequency-hopped signal the base-message data.

17. A frequency-hopping-communications system for communicating base-message data to a plurality of remote units, said frequency-hopping-communications system comprising:

a plurality of base stations for communicating, using an assigned system bandwidth B, with the system bandwidth B divided into N sets of frequencies, with each set of the N sets of frequencies having frequencies different from other sets of the N sets of frequencies, base-message data to the plurality of remote units, each of said plurality of base stations having a coverage area divided into a plurality of M sectors, with each of said plurality of M sectors divided into a plurality of N concentric regions, with each concentric region of each of said plurality of M sectors assigned one of the N sets of frequencies for communicating with a particular base station without frequency reuse within each of said plurality of M sectors, each of said plurality of base stations for communicating with a selected-remote unit located within a particular concentric region of a particular sector, each of said plurality of base stations including,

a base modulator for converting the base-message data to a form suitable for sending over radio waves;

a base hopping device, coupled to said base modulator, for frequency hopping the converted-base-message data over a set of frequencies assigned to the particular-concentric region of the particular sector, thereby generating a frequency-hopped signal using concentric-region-specific frequencies;

a base controller, coupled to said base-hopping device and responsive to said selected-remote unit being located in the particular-concentric region of the particular sector, for controlling the set of frequencies used by said base-hopping device for communicating with said selected-remote unit, with the set of frequencies having frequencies different from other sets of frequencies used in other concentric regions within the particular sector;

a base-power amplifier for amplifying the frequency-hopped signal; and

a plurality of M-sector base antennas coupled to said base-power amplifier, for radiating the frequency-hopped signal from each of said plurality of base stations to said selected-remote unit, each of said plurality of M-sector base antennas for radiating to a specific sector of the plurality of M sectors, with a number of the plurality of M-sector base antennas being equal to a number of the plurality of M sectors;

each of said plurality of remote units including,

a remote antenna; and

a remote receiver coupled to said remote antenna for recovering from the frequency-hopped signal the base-message data.

18. The frequency-hopping-communications system as set forth in claim 17 further including forward-power means, responsive to the selected-remote unit being located within the particular-concentric region for controlling a power level of said base-power amplifier for communicating with said selected-remote unit.

19. A frequency-hopping-communications method for communicating base-message data to a plurality of remote units, said frequency-hopping-communications method comprising the steps of:

communicating from a plurality of base stations base-message data to the plurality of remote units using an assigned system bandwidth B, with the assigned system bandwidth B divided into N sets of frequencies, with each set of the N sets of frequencies having different frequencies from frequencies used in other sets of the N sets of frequencies, each of said plurality of base stations having a coverage area divided into a plurality of M sectors, with each of said plurality of M sectors divided into a plurality of N concentric regions, with each concentric region of each sector assigned one of the N sets of frequencies, each of said plurality of base stations for communicating with a selected-remote unit located within a particular concentric region of a particular sector, including the steps of,

converting the base-message data to a form suitable for sending over radio waves;

frequency hopping the converted-base-message data over a set of frequencies assigned to the particular concentric region of the particular sector, thereby generating a frequency-hopped signal using concentric-region-specific frequencies;

controlling, in response to said selected-remote unit being located in the particular concentric region of the particular sector, the set of frequencies used by each of said plurality of base stations for communicating with said selected-remote unit, with the set of frequencies having frequencies different from other sets of frequencies used in other concentric regions within the particular sector;

amplifying the frequency-hopped signal;

transmitting, using at least one of a plurality of M-sector base antennas for radiating to a specific sector, the frequency-hopped signal from each of said plurality of base stations to said selected-remote unit, with a number of the plurality of M-sector base antennas at each of said plurality of base stations being equal to a number of the plurality of M sectors at each of said plurality of base stations;

receiving the frequency-hopped signal at said selected-remote unit; and

recovering, from the frequency-hopped signal, the base-message data.

20. The frequency-hopping-communications method as set forth in claim 19 further including the step of controlling, in response to the selected-remote unit being located within the particular-concentric region, a power level of said plurality of base stations for communicating with said selected-remote unit.

21. A frequency-hopping-communications method for communicating base-message data to a plurality of remote units, said frequency-hopping-communications method comprising the steps of:

communicating from a base station base-message data to a plurality of remote units using an assigned system bandwidth B, with the assigned system bandwidth B divided into N sets of frequencies, with each set of the N sets of frequencies having different frequencies from frequencies used in other sets of the N sets of frequencies, the base station having a coverage area divided into a plurality of M sectors, with each of said plurality of M sectors divided into a plurality of N concentric regions, with each concentric region of each sector assigned one of the N sets of frequencies, the base station for communicating with a selected-remote unit located within a particular concentric region of a particular sector, including the steps of,

converting the base-message data to a form suitable for sending over radio waves;

frequency hopping the converted-base-message data over a set of frequencies assigned to the particular concentric region of the particular sector, thereby generating a frequency-hopped signal using concentric-region-specific frequencies;

controlling, in response to said selected-remote unit being located in the particular concentric region of the particular sector, the set of frequencies used by the base station for communicating with said selected-remote unit, with the set of frequencies having frequencies different from other sets of frequencies used in other concentric regions within the particular sector;

amplifying the frequency-hopped signal;

transmitting, using at least one of a plurality of M-sector base antennas for radiating to a specific sector, the frequency-hopped signal from the base station to said selected-remote unit, with a number of the plurality of M-sector base antennas at the base station being equal to a number of the plurality of M sectors at the base station;

receiving the frequency-hopped signal at said selected-remote unit; and

recovering, from the frequency-hopped signal, the base-message data.

22. A frequency-hopping-communications method for communicating base-message data to a remote unit, said frequency-hopping-communications method comprising the steps of:

communicating from a base station base-message data to a remote unit using an assigned system bandwidth B, with the assigned system bandwidth B divided into N sets of frequencies, with each set of the N sets of frequencies having different frequencies from frequencies used in other sets of the N sets of frequencies, the base station having a coverage area divided into a plurality of M sectors, with each of said plurality of M sectors divided into a plurality of N concentric regions, with each concentric region of each sector assigned one of the N sets of frequencies, the base station for communicating with the remote unit as located within a particular concentric region of a particular sector, including the steps of,

converting the base-message data to a form suitable for sending over radio waves;

frequency hopping the converted-base-message data over a set of frequencies assigned to the particular concentric region of the particular sector, thereby generating a frequency-hopped signal using concentric-region-specific frequencies;

controlling, in response to the remote unit being located in the particular concentric region of the particular sector, the set of frequencies used by the base station for communicating with the remote unit, with the set of frequencies having frequencies different from other sets of frequencies used in other concentric regions within the particular sector;

amplifying the frequency-hopped signal;

transmitting, using a particular one of a plurality of M-sector base antennas, the particular one of the plurality of M-sector base antennas for radiating to a specific sector, the frequency-hopped signal from the base station to the remote unit located in the specific sector, with a number of the plurality of M-sector base antennas at the base station being equal to a number of the plurality of M sectors at the base station;

receiving the frequency-hopped signal at the remote unit; and

recovering, from the frequency-hopped signal, the base-message data.