Wide area radio communication network system and method

• US 5,448,753 A
• Filed: 08/12/1993
• Issued: 09/05/1995
• Est. Priority Date: 09/05/1988
• Status: Expired due to Fees

• Current Assignee: Time Space Radio AB
• Original Assignee: Joakim Nelson, Karl-Axel Ahl
• Inventors: Nelson, Joakim, Ahl, Karl-Axel
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): Pham, Chi H.
• Application Number:
  US08/104,944
• Time in Patent Office: 754 Days
• Field of Search: 455/16, 455/33.1-33.4, 455/34.1, 455/25, 455/51.1, 455/51.2, 455/56.1, 455/63, 342/359, 342/367, 370/58.1, 370/59, 370/85.7, 370/85.8
• US Class Current: 455/422.1
• CPC Class Codes: H04W 16/28 using beam steering

Abstract

A method and system in a wide area radio communications network. The network has at least two central stations, each central station being assigned to at least one peripheral station. According to the method radio transmission at specific frequencies between stations positioned along an arbitrary line is coordinated during all time intervals. The stations are provided with timers, transmitters and receivers for transmitting and receiving during predetermined time intervals in a predetermined direction.

Claims

1. A method of communication in a wide area radio communication network, said network comprising at least two central stations, each central station being assigned to at least one peripheral station, each central station and each peripheral station having means for transmitting radio energy and receiving radio energy, means arranged in said central stations for communicating to and from said central stations radio signals in predetermined transmission directions during predetermined time intervals, said means for communicating including a directed antenna system, each central station transmitting and receiving radio signals to cover a service area, said method including the steps of:

(a) dividing a total service area coverage of each central station into different geographical sub-service area segments covered during selected time segments;

(b) operating each central station in different sub-areas by controlling said directed antenna system to operate in said sub-service area segment during predetermined time intervals;

(c) storing in each of said central stations information about distance and direction to each assigned peripheral station;

(d) distributing from each central station to each assigned peripheral station coordination signal information, said information including timing compensation with respect to the distance between said central station and said peripheral station assigned thereto, and including actual time intervals selected by said central station for sending information to said central station from said peripheral station; and

(e) coordinating in each central station reception of information transmitted from each assigned peripheral station at said time intervals by directing during said time intervals the antenna of said central station towards said peripheral station.

2. The method according to claim 1 further including the step of communicating signals organized in a time division structure consisting of a time frame structure which is subdivided into a plurality of time slots, between each of said central stations and other stations.

3. The method according to claim 2, further including the step of in each peripheral station adjusting, within selected time slots to be used for the communication between a central station and each assigned peripheral station the transmission time with respect to the distance between said stations, to maintain said time frame structure.

4. The method according to claim 1, further including the step of optimizing with respect to a combination of optimum radio signal strength and minimal disturbance, the transfer of radio signals through the antenna systems of said central station.

5. The method according to claim 1, further including the step of directing an antenna lobe of a directed antenna system towards the antenna systems of said central station.

6. The method according to claim 1, further including the step of applying error detection measures to information transferred between each central station and any assigned peripheral station, in order to measure transmission quality.

7. The method according to claim 6, further including the step of correcting detected errors by redirecting said directed antenna systems to improve transmission quality between said central station and assigned peripheral station.

8. The method according to claim 6, further including the step of initiating a change of time slot selection in the communication between respective central station and assigned peripheral station when errors are detected.

9. The method according to claim 6, further including the step of initiating a change of frequency when errors are detected.

10. The method according to claim 6, further including the step of initiating application of error correction measures when errors are detected.

11. The method according to claim 1 wherein signals transferred between each central station and any peripheral station include elements for error correction.

12. The method according to claim 2, further including the step of synchronizing the time frame structure of a first central station and the time frame structure of a second central station.

13. The method according to claim 1, further including the step of controlling the level of transmitted radio energy from at least said central station to its assigned peripheral station to achieve a predetermined level of transmission quality.

14. The method according to claim 2, further including the step of utilizing a common frequency band for all stations for providing radio capacity to each central station and its associated peripheral station time frames of each central station and its assigned peripheral station being separated into more than one time slot, and each frame being separated in a send and a receive time interval, each of said time intervals representing a consecutive number of time slots.

15. The method according to claim 1 wherein said peripheral station is stationary during communication with said central station.

16. The method according to claim 1 wherein said peripheral station is movable during communication with said central station.

17. The method according to claim 1, further including the step of coordinating said division of a service area of a first central station into different geographical subservice area segments in selected time segments and a corresponding division in a second central station to avoid interference, said first and second central stations having overlapping service areas and utilizing overlapping frequency bands.

18. The method according to claim 2, further including the step of using different separate frequency bands for transmitting and receiving, respectively, radio signals in each central station and each peripheral station.

19. The method according to claim 1, further including the step of storing said distributed information including timing compensating data and time intervals in said peripheral station receiving said information.

20. A system for communicating in a wide area radio communication network, said network comprising at least two central stations, and a plurality of peripheral stations, each central station being assigned to at least one peripheral station,

each said central station comprising:

means for transmitting and receiving radio signals to and from any assigned peripheral station assigned thereto, said means including a controllable directional antenna system,

means for controlling said directional antenna system in specific directions during selected specific time segments in at least two directions,

means for storing position data including distance and direction to at least said associated peripheral station; and

each of said peripheral stations comprising;

means for transmitting and receiving radio signals to and from any associated central station,

means for receiving timing information and distance information, and

means for storing said timing and distance information in each peripheral station for controlling the timing of transmitting radio signals to said central station on the basis of said timing and distance information.