CDMA code address data routing system and method
AssigneeSpace Systems/Loral, Inc.
InventorDavid P. Grybos
Life of this patent
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Abstract
Communications apparatus, such as a multibeam satellite communications system on-board a satellite, or terrestrial communications system, and methods that use a data routing technique that is based on the assignment of one or more codes corresponding to a destination beam. In particular, data routing is performed based on a CDMA code. The communications apparatus and methods allow simplified processing of the data address and routing of the data.
Claims18
Communication apparatus comprising:
- a communication system;
- a plurality of user terminals communicate with each other by way of the communication system;
- and
- a network control center controls the communication system and communicates by way of the communication system with the user terminals, and wherein the network control center transmits status messages to the communication system and user terminals that assign a unique CDMA code to each destination address;
- and wherein each user terminal utilizes a spreading code appropriate for where it is located to receive and despread messages destined for it.
A data routing method that provides a communication link between a plurality of ground-based user terminals, and that comprises a network control center that communicates by way of the communication system with the user terminals, the method comprising the steps of:
- generating status messages at the network control center that assign a unique CDMA code to each destination address;
- transmitting status messages from the network control center to the user terminals;
- obtaining, at each user terminal, an appropriate code address from the status messages broadcast from the network control center;
- and
- using a spreading code at each user terminal that is associated with the code address to selectively receive and despread messages destined for it.
A data routing method for use with a satellite-based multibeam communication system that provides a communication link between a plurality of ground-based user terminals, and that comprises a network control center that communicates by way of the multibeam communication system with the user terminals, the method comprising the steps of:
- generating status messages at the network control center that assign a unique CDMA code to each destination beam address;
- transmitting status messages from the network control center to the user terminals;
- obtaining, at each user terminal, an appropriate code address from the status messages broadcast from the network control center;
- and
- using a spreading code at each user terminal that is associated with the code address that is appropriate for the downlink beam in which it is located to selectively receive and despread messages destined for it.
The method recited in claim further comprising the step of transmitting a reference signal from the network control center to the user terminals to aid power and code time synchronization at the user terminals.
Dependencies are inferred from the claim text.