Networked repeater

• US 6,052,558 A
• Filed: 04/28/1997
• Issued: 04/18/2000
• Est. Priority Date: 04/28/1997
• Status: Expired due to Term

• Current Assignee: CDC Propriete Intellectuelle
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Cook, Dean Lawrence, Andresen, Michael J., Corman, David Warren
• Primary Examiner(s): Vo, Nguyen
• Assistant Examiner(s): Aoki, Makoto
• Application Number:
  US08/842,102
• Time in Patent Office: 1,086 Days
• Field of Search: 455/12.1, 455/13.1, 455/13.2, 455/427, 455/562, 455/524
• US Class Current: 455/12.1
• CPC Class Codes: H04B 7/18536 Shadowing compensation therefor, e.g. by using an additional terrestrial relay

Abstract

Cellular communication systems (20) use repeaters (50) to communicate with subscriber units (24) otherwise shadowed from base stations (22). A networked repeater (50) is provided for use in a cellular communication system with low-earth orbit satellites (22) and mobile subscriber units (24). Networked repeater (50) includes a base transceiver module (54) for communicating with the base stations (22) and a plurality of subscriber transceiver modules (56), each of which communicates with subscriber units (24). The base transceiver module (54) is located so as to be unshadowed, i.e. able to have unimpeded communication with at least one of the satellites (22). The subscriber transceiver module (56) is located so as to provide unshadowed communication with the subscriber units (24) that would otherwise be shadowed, i.e. unable to have unimpeded communication with any of the satellites (22).

Claims

1. A networked repeater for a mobile radio communication system, wherein said networked repeater comprises:

a base transceiver module for communicating with a plurality of mobile base stations, each mobile base station located on a satellite moving with respect to earth'"'"'s surface, said base transceiver having a base antenna located to achieve substantially unimpeded communications with at least one of said mobile base stations;

a subscriber transceiver module having a subscriber antenna for communicating with a mobile subscriber unit, said subscriber transceiver module being physically separated from said base transceiver module;

a data link for communicating between said base transceiver module and said subscriber transceiver module, wherein when direct communication between said mobile subscriber unit and said one mobile base station becomes impeded as a result of the movement of said mobile base stations, said direct communication with said one mobile base station is handed-off to said subscriber transceiver module and said base station transceiver module provides communications between said one mobile base station and said subscriber transceiver module over said data link;

a controller protocol converter coupled to said data link for restructuring overhead data communicated between said one mobile base station and said mobile subscriber unit in response to the handing-off of said mobile subscriber unit to said subscriber transceiver module, and

wherein prior to the handing-off, the mobile subscriber unit communicates with the mobile base station over a first channel, and wherein after the handing-off, said base transceiver module communicates with the mobile base station over said first channel, and wherein after the handing-off the controller protocol converter further restructures said overhead data to allocate a different channel for communicating between said subscriber transceiver module said mobile subscriber unit, the first channel and the different channel being non-interfering channels,

wherein when direct communication between one of the mobile subscriber units and said one mobile base station subsequently becomes unimpeded as a result of the movement of said mobile base stations, communication between said mobile subscriber unit and said subscriber transceiver module is handed-off to said mobile base station, and said subscriber unit transceiver module refrains from providing communications with said one mobile subscriber unit.

2. A networked repeater as claimed in claim 1 wherein said subscriber transceiver module comprises:

a transceiver control assembly;

a plurality of transceiver head-end assemblies, each of said transceiver head-end assemblies having a subscriber antenna; and

an RF combining network for communicating between said transceiver control assembly and each of said transceiver head-end assemblies.

3. A networked repeater as claimed in claim 2 wherein said subscriber antenna in each of said transceiver head-end assemblies is located so as to provide substantially unimpeded communication with said mobile subscriber unit where said mobile subscriber unit does not have unimpeded communication with said base station.

4. A networked repeater as claimed in claim 1 wherein:

said mobile subscriber unit is a first subscriber unit; and

said subscriber transceiver module simultaneously communicates with a plurality of said mobile subscriber units wherein said plurality of said mobile subscriber units includes said first subscriber unit.

5. A networked repeater as claimed in claim 4 wherein subscriber units communicate with said mobile base stations over subscriber links:

said base transceiver module communicates with said mobile base station via a base-repeater link; and

said controller protocol converter causes said base-repeater link to simulate said subscriber links.

6. A mobile radio communication system comprising:

a plurality of mobile base stations, each located on a satellite moving with respect to earth'"'"'s surface; and

a substantially-stationary networked repeater having a base transceiver module and a base antenna for directly communicating with at least one of said mobile base stations, said base antenna located to achieve substantially unimpeded communications with said at least one of said mobile base stations, wherein,

mobile subscriber units are configured for communicating with said mobile base stations and said substantially-stationary networked repeater, and wherein

the substantially-stationary networked repeater comprises;

a plurality of subscriber transceiver modules, each having a subscriber antenna for communicating with mobile subscriber units; and

a data link coupling the plurality of subscriber transceiver modules with the base transceiver, the plurality of subscriber transceiver modules being geographically separated from the base transceiver, wherein when direct communication between one of the mobile subscriber units and said one mobile base station becomes impeded as a result of the movement of said mobile base stations, said direct communication with said one mobile base station is handed-off to one of said subscriber transceiver modules, and said base station transceiver module providing communications between said one mobile base station and said one subscriber transceiver module over said data link,

and wherein when direct communication between one of the mobile subscriber units and said one mobile base station subsequently becomes unimpeded as a result of the movement of said mobile base stations, communication between said mobile subscriber unit and said one subscriber transceiver module is handed-off to said mobile base station, and said one subscriber unit transceiver module refraining from providing communications with said one mobile subscriber unit.

7. A mobile radio communication system as claimed in claim 6 wherein said substantially-stationary networked repeater further comprises:

a controller protocol converter coupled to said data link for restructuring overhead data communicated between said one mobile base station and said one mobile subscriber unit in response to the handing-off of said one mobile subscriber unit to said one subscriber transceiver module,

wherein prior to the handing-off, the mobile subscriber unit communicates with the mobile base station over a first channel, and

wherein after the handing-off, said base transceiver module communicates with the mobile base station over said first channel, and wherein after the handing-off the controller protocol converter further restructures said overhead data to allocate a different channel for communicating between said subscriber transceiver module said mobile subscriber unit, the first channel and the different channel being non-interfering channels.

8. A mobile radio communication system as claimed in claim 7 wherein:

a downcast signal is transmitted by said mobile base station to said mobile subscriber unit through said substantially-stationary networked repeater, said downcast signal containing communications data which includes said overhead data;

said base transceiver module comprises a downcast receiver element coupled to a base antenna and configured to receive said downcast signal from said mobile base station through said base antenna;

said subscriber transceiver module comprises a downcast transmitter element coupled to a subscriber antenna and configured to transmit said downcast signal to said mobile subscriber unit through said subscriber antenna;

said downcast receiver element is additionally configured to demodulate said downcast signal to extract said communications data;

said controller protocol converter is configured to accept said communications data from said downcast receiver element, restructure said overhead data to produce restructured communications data, and pass said restructured communications data to said downcast transmitter element; and

said downcast transmitter element is additionally configured to modulate said restructured communications data to produce said downcast signal.

9. A mobile radio communication system as claimed in claim 7 wherein:

an upcast signal is transmitted by said mobile subscriber unit to said mobile base station through said substantially-stationary networked repeater, said upcast signal containing communications data which includes said overhead data;

said subscriber transceiver module comprises an upcast receiver element coupled to a subscriber antenna and configured to receive said upcast signal from said mobile subscriber unit through said subscriber antenna;

said base transceiver module comprises an upcast transmitter element coupled to a base antenna and configured to transmit said upcast signal to said mobile base station through said base antenna;

said upcast receiver element is additionally configured to demodulate said upcast signal to extract said communications data;

said controller protocol converter is configured to accept said communications data from said upcast receiver element, restructure said overhead data to produce restructured communications data, and pass said restructured communications data to said upcast transmitter element; and

said upcast transmitter element is additionally configured to modulate said restructured communications data to produce said upcast signal.

10. A mobile radio communication system as claimed in claim 6 wherein said mobile radio communication system is configured to:

allocate channels to each of said mobile base stations within said plurality, wherein said allocation of channels substantially prevents interference between said mobile base stations; and

allocate channels to said substantially-stationary networked repeater to prevent interference between said substantially-stationary networked repeater and said mobile base stations.

11. A mobile radio communication system as claimed in claim 10 wherein said mobile radio communication system is configured to periodically update said allocations of channels to each of said mobile base stations and to said substantially-stationary networked repeater, wherein said update maintains said prevention of interference.