Mobile radio network for nationwide communications

• US 4,845,504 A
• Filed: 04/08/1987
• Issued: 07/04/1989
• Est. Priority Date: 04/08/1987
• Status: Expired due to Term

• Current Assignee: The Whitaker Corporation (Meggitt PLC)
• Original Assignee: M/A Com
• Inventors: Ong, Chong K., Roberts, Carlos V., Puente, John G.
• Primary Examiner(s): Blum, Theodore M.
• Application Number:
  US07/035,791
• Time in Patent Office: 818 Days
• Field of Search: 342/457, 342/460, 455/52, 455/54
• US Class Current: 342/457
• CPC Class Codes: H04B 7/26 at least one of which is mobile
• CPC Class Codes: H04L 1/16 in which the return channel carries supervisory signals, e.g. repetition request signals
• CPC Class Codes: H04L 1/1867 Arrangements specially adapted for the transmitter end
• CPC Class Codes: H04W 16/24 Cell structures
• CPC Class Codes: H04W 74/06 using polling

Abstract

A mobil radio communication network utilizing meteor burst communication medium. A master station communicates with a plurality of mobile radio stations using digital messaging. Each of the master stations generates polling data sent over a plurality of sectors to identify mobile radio stations to which messages are to be transmitted. Messages for transmission are composed at the master station, and when an acknowledgement is received in one of a plurality of receive sectors at the master station from the polling command, the messages are subsequently transmitted. Transmission of a message following receipt of an acknowledgement occurs only over a transmit sector containing the received acknowledgement signal. Messages may be composed in each of the mobile radio stations and sent digitally to the master station which responds by sending an acknowledgement over the transmit sector which is coextensive with the receive sector having processed the acknowledgement signal.

Claims

1. A meteor burst communication system for communicating with a plurality of mobile radio stations from a single location comprising:

a master transmit station for composing digital data messages, said master transmit station including a plurality of transmitters at one location for transmitting said digital data messages in a plurality of azimuth transmit sectors;

a master receive station located at said transmit station site, said receive station having a plurality of azimuth receive sectors coextensive with said transmit sectors; and

a host computer for initiating transmission of digital polling signals from said transmit station in said plurality of transmit sectors until an acknowledge signal is received from a polled mobile radio station in one of said receive sectors and identifying said receive sector, and said master station transmitting a subsequent digital message in lieu of said polling signal in one of said transmit sectors which includes said one receive sector, without transmitting said subsequent message in all said transmit sectors.

2. The communication system of claim 1 further comprising means for scanning each receive sector in elevation.

3. The communication system of claim 2 wherein said receive sectors scanning means is inhibited when a signal is being received in said sector.

4. The communication system of claim 2 wherein said means for scanning scans each receive sector in azimuth.

5. The meteor burst communication system of claim 1 further comprising means for inhibiting steering of said beam when a signal from a mobile unit is detected in a receive sector containing said beam.

10. The meteor burst communication system of claim 1 wherein said azimuth transmit sectors are time multiplexed on an alternate basis to avoid co-sector interference.

6. A meteor burst master radio station for communicating with a plurality of mobile radio station units comprising:

a master radio station having a plurality of azimuth transmit sectors at one master radio station site for transmitting digital messages to said mobile radio units and receiving digital messages in a plurality of azimuth receive sectors, said station originating in all of said transmit sectors a polling command identifying each mobile radio unit for which a message is to be transmitted;

a plurality of receive sectors greater in number than said transmit sectors at aid one master radio station site for receiving incoming messages from said mobile radio units, said receive sectors processing and decoding each received message;

a master station controller connected to route outbound messages to one or more of said azimuth transmit sectors, and connected to each of said receive sectors for receiving incoming messages identifying which of said receive sectors contains each incoming message, said master station controller including a host computer programmed to poll each of said mobile radio units in a plurality of transmit sectors for which a digital message is destined to detect the presence of an acknowledge signal sent by said mobile radio units, and to send each digital outbound message to said acknowledging mobile radio station in only one of said transmit sectors which contains an identified receive sector.

7. The meteor burst master radio station of claim 6 wherein said master radio station and mobile radio station transmit on different frequencies.

8. The meteor burst communication system of claim 7 wherein said master station transmits an acknowledge signal to each mobile radio station which transmits a message.

9. The meteor burst communication system of claim 6 wherein said host computer tallies each received acknowledge signal, and initiates a change in polarization for said transmit sectors when the rate of received acknowledge signals per transmitted polling message falls below a predetermined rate.

11. A meteor burst communication system for communicating with a plurality of mobile radio stations comprising:

a master transmit station for composing digital data messages, said master station including a transmitting antenna array forming a plurality of transmit sectors comprising individual azimuth sectors which form a composite transmit pattern;

a plurality of transmitters connected to said transmitting antenna array, each forming with said array a separate transmit sector, and having an input for receiving a digital message for transmission over said sector;

a master receive station located at said transmit station, said receive station including a receiving antenna array forming a plurality of receive sectors greater in number than said transmit sectors, forming a composite receive pattern coextensive with said composite transmit pattern;

a plurality of receivers connected to said receiving antenna array for receiving radio frequency signals in an individual receive sector, and demodulating data contained in said radio frequency signals; and

,

a host computer connected to supply digital messages for transmission to said mobile radio stations and receive digital messages from said receivers, said host computer transmitting messages to said mobile radio stations over a transmit sector containing a mobile station identified to receive a particular message, and transmitting over the transmit sectors containing other mobile radio stations'"'"' messages destined for said other stations.

12. The meteor burst communication system of claim 11 wherein said host computer initiates polling commands over all of said transmit sectors to determine the location of mobile units which are to receive a digital message, and identifies an individual receive sector which produces an acknowledging signal from a polled mobile unit.

13. The meteor burst communication system of claim 12, wherein a transmit sector containing said identified individual receive sector, is identified by said computer, and said digital message is sent to a transmitter which uses said identified transmit sector.

14. The meteor burst communication system of claim 12, wherein each of said receive sectors includes a receive beam which is steerable within a receive sector.

16. The meteor burst communication system of claim 13, wherein said host computer initiates a subsequent polling command in transmit sectors which were previously in communication with a mobile radio station being polled.

17. The meteor burst communication system of claim 14 wherein said receive beam is steerable in elevation.

18. The meteor burst communication system of claim 12 wherein said mobile stations each include a position location unit for periodically reporting to said master station a geographical position for said mobile unit.

15. The meteor burst communicating system of claim 15 wherein said receive beam is steerable in both azimuth and elevation.