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Digital signal organized in self-contained data containers, especially for data transmission to selective call receivers

  • US 5,875,178 A
  • Filed: 02/03/1997
  • Issued: 02/23/1999
  • Est. Priority Date: 04/19/1994
  • Status: Expired due to Fees
First Claim
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1. A digital signal designed to be received by a plurality of receivers, at least one of the receivers having limited autonomy, of the type organized in signal frames, each signal frame comprising a main service channel organized into sub-channels characterized in that at least certain of said frames further comprise at least one data channel organized into blocks of independent data elements dedicated to a single service, called containers, each container comprising:

  • a header constituted by a selection sub-header containing inter alia data elements for identifying a group of at least one container destination receiver, and a service sub-header containing inter alia data dedicated to the service;

    a useful data field containing source data elements corresponding to a given service; and

    an error detection and/or correction data field,said selection sub-headers being disconnected from their containers and assembled in at least one specialized service container subjected to a simplified channel encoding so that said receivers can detect the presence of a container that is dedicated to it by the low-cost analysis of the decoding of said specialized service container,said selection sub-headers further containing access data elements enabling the position of the corresponding container in said data path to be determined,each container independently undergoing a specific convolutional encoding.

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