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Satellite communication system for local-area coverage
| Details |
Inventors: Chennakeshu, Sandeep; Rydbeck, Nils; Hassan, Amer; Reinhold, Stanley L.; Irvin, David R.;
Assignee: Ericsson Inc. (Research Triangle Park, NC)
Primary Examiner: Chin; Wellington
Assistant Examiner: Woldetatios; Yemane
Attorney, Agent or Firm: Burns, Doane, Swecker & Mathis, L.L.P.
A communication system provides efficient satellite communication in rural, remote, or sparsely populated areas, or in areas lacking a conventional telephone infrastructure, or in special purpose uses such as airport coverage. Subscribers in such areas communicate with the satellite via a simple, highly modular entry node located in a local area to be served. Subscriber units provide subscribers with access to the system. The subscriber units are connected to the entry node via local access loops provided by point-to-point wireless links between the subscriber units and the entry node. The entry node internally switches local traffic among subscribers and connects traffic to outside circuits, via wireless links with the satellite, as appropriate. The outside circuits are provided by the cooperative working of the satellite, an entry-node controller, and an earth station. The wireless links between the satellite and the entry node and the local access loops may operate at the same or different frequencies. If they operate at different frequencies, a frequency translator in the entry node controller matches the different frequencies. A subscriber unit may be used to provide the subscribers with access to the system such that speech compression and decompression takes place in the subscriber unit itself to avoid the effects of tandem coder/decoders. |
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DETAILED DESCRIPTION FIG.
2 illustrates a communication system in accordance with the invention.
Subscriber units 110 provide subscribers with access to the communication system, and each unit 110 may comprise, for example, a conventional cordless telephone.
The subscriber units 110 are connected to a simple, highly modular entry node 600 by respective local access loops, which are illustrated in FIG.
2 as wireless radio links between the subscriber units 110 and an antenna 625 for the entry node 600.
The local access loops may operate, for example, according to the Digital European Cordless Telecommunications (DECT) standard, the Global System for Mobile Communication (GSM) standard, or other known or compatible standards for wireless communications, such as the standards used for specialized private mobile radio applications.
Although FIG.
2 illustrates the local access loops as wireless radio loops, it will be appreciated that the local access loops may include terrestrial optical fiber, coaxial cable, or copper wire loops.
In addition, it will be appreciated that the subscriber units 110 may include conventional wireline and other telephones.
Traffic from the subscriber units 110 is carried to and from the satellite system 200 by the entry node 600, which is located in a local area to be served by the system.
The entry node 600 internally switches local traffic among the subscribers and connects traffic between the subscribers in the local area and outside circuits through the satellite system as appropriate.
The entry node 600 communicates with the satellite system 200 via a suitable antenna 675, and the satellite system communicates with an earth station 400 via an antenna 450.
A communication interface 520 connects the earth station 400 to a remote network, such as a PSTN, a public land mobile network (PLMN), a public switched data network (PSDN), or other remote network, and thus facilitates communication between the subscribers in the local area of the entry node 600 and the outside circuits of the remote network
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