Digital signal organized in self-contained data containers, especially for data transmission to selective call receivers
First Claim
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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Accused Products
Abstract
A digital signal to be received by a plurality of receivers, particularly restricted-range receivers, and divided into signal frames of which at least some include both a main data channel consisting of sub-channels, and a data transport path including at least one data channel consisting of separate data blocks dedicated to a single service and known as containers. Each container includes a header (41) consisting of a selection sub-header (44) containing, inter alia, data (46) for identifying a group of at least one container destination receiver, and a service sub-header (45) containing, inter alia, dedicated service data; a separately convolutionally coded working data field (42) containing source data for a given service; and an error detection and/or correction data field 943). Said selection sub-headers (44) are disconnected from the respective containers and collected in at least one dedicated service container subjected to simplified channel coding to enable the receivers to detect the presence of a container dedicated thereto by low-cost decoding analysis of said dedicated service container, said selection sub-headers (44) further containing access data (410) for determining the position of the corresponding container in said data path. The above-system enables the digital audio broadcasting (DAB) standard to be used for broadcasting paging data.
33 Citations
10 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10)
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9. A method for the broadcasting of a digital signal comprising the following acts:
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providing at least one identified source signal element designed to be received by at least one specific receiver; construction at least one data container corresponding to said identified source signal element, comprising the acts of; subdividing said signal source element into at least one data block of a predetermined size; specifically convolutionally encoding said data block; associating a selection sub-header with said data block, said selection sub-header containing at least data elements for the identification of at least one container destination receiver and a service sub-header containing at least data elements dedicated to the service; creating at least one special selection container in which there are said selection sub-headers disconnected from the corresponding headers; constructing a data path containing a plurality of containers, among them at least one special selection container; constructing a signal frame comprising in particular said data path; and transmitting said frame.
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Specification