Information transmission system
First Claim
1. An information transmission system, comprising at least one primary station and a plurality of secondary stations, whereinsaid primary station comprises means for transmitting traffic information in packets during traffic time periods, and control information during control time slots interspersed among the traffic time periods,each secondary station comprises means for receiving information transmitted by the primary station, the respective means for receiving comprised in one secondary station being one receiving means,characterized in that, responsive to receipt of a plurality of traffic information to be transmitted respectively to a plurality of said secondary stations including said one secondary station, during one of said control time slots said means for transmitting (a) transmits a plurality of identifier signals respectively identifying each secondary station for which succeeding traffic information is intended, including one identifier signal identifying said one secondary station;
- (b) for each identifier signal transmitted, provides a respective location code, independent of characteristics of the respective identifier signal, corresponding to a respective traffic time slot within a succeeding traffic time period; and
(c) during each said respective traffic time slot transmits said traffic information for the respective secondary station identified by said respective identifier signal,said one secondary station comprises means for deenergizing said one receiving means, for reenergizing said one receiving means during the control slots and then deenergizing said one receiving means, andmeans, responsive to reception of said one identifier signal, for again reenergizing said one receiving means during at least a part of said succeeding traffic time period.
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Accused Products
Abstract
An information transmission system comprises a primary station and a number of secondary stations, information being transmitted from the primary station during traffic time periods which are interspersed in time with control time slots. The control time slots contain control data (CD) which contains a number of identifying indications (CMD1,CMD2,CMD3,CMD4) which each may include an address relating to a secondary station for which succeeding traffic information is intended. The identifying indications may be configured in a number of different ways, for example (E1), it may contain an address (A) and a traffic position identifier (XN). It may also contain, for example (E2), a channel identifier (CH). The information in the control slots allows secondary stations, which may be powered down for substantial periods of time, to prepare for reception of succeeding information if an address identifying that secondary station is included in the control data (CD).
159 Citations
16 Claims
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1. An information transmission system, comprising at least one primary station and a plurality of secondary stations, wherein
said primary station comprises means for transmitting traffic information in packets during traffic time periods, and control information during control time slots interspersed among the traffic time periods, each secondary station comprises means for receiving information transmitted by the primary station, the respective means for receiving comprised in one secondary station being one receiving means, characterized in that, responsive to receipt of a plurality of traffic information to be transmitted respectively to a plurality of said secondary stations including said one secondary station, during one of said control time slots said means for transmitting (a) transmits a plurality of identifier signals respectively identifying each secondary station for which succeeding traffic information is intended, including one identifier signal identifying said one secondary station; - (b) for each identifier signal transmitted, provides a respective location code, independent of characteristics of the respective identifier signal, corresponding to a respective traffic time slot within a succeeding traffic time period; and
(c) during each said respective traffic time slot transmits said traffic information for the respective secondary station identified by said respective identifier signal,said one secondary station comprises means for deenergizing said one receiving means, for reenergizing said one receiving means during the control slots and then deenergizing said one receiving means, and means, responsive to reception of said one identifier signal, for again reenergizing said one receiving means during at least a part of said succeeding traffic time period. - View Dependent Claims (2, 3, 4, 5, 6)
- (b) for each identifier signal transmitted, provides a respective location code, independent of characteristics of the respective identifier signal, corresponding to a respective traffic time slot within a succeeding traffic time period; and
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7. A secondary station for use in an information transmission system comprising at least one primary station and a plurality of secondary stations, wherein the primary station transmits traffic information in packets during traffic time periods, and transmits control information during control time slots interspersed among the traffic time periods;
- said control information includes respective identifier signals at respective positions in said control slot, and a respective location code, independent of characteristics of the respective identifier signal, corresponding to a location within a succeeding traffic time period; and
each identifier signal corresponds to a respective one of a plurality of said secondary stations to which traffic information is to be transmitted, andwherein said secondary station comprises receiving means for receiving information transmitted by the primary station, characterized in that said secondary station comprises means for deenergizing said receiving means, for reenergizing said receiving means during the control time slots and then deenergizing said receiving means, and means, responsive to reception of the respective identifier signal identifying said secondary station during said control time slots, for again reenergizing said receiving means during at least a part of said succeeding traffic time period corresponding to said location code. - View Dependent Claims (8, 9, 10)
- said control information includes respective identifier signals at respective positions in said control slot, and a respective location code, independent of characteristics of the respective identifier signal, corresponding to a location within a succeeding traffic time period; and
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11. A primary station for an information transmission system, for transmitting information to selected ones of a plurality of secondary stations,
said primary station comprising means for transmitting traffic information in packets during traffic time periods, and control information during control time slots interspersed among the traffic time periods, characterized in that said primary station comprises means for storing a plurality of traffic information packets and a corresponding plurality of intended destinations for the respective traffic information packets, means for selecting at least two of said intended destinations to be said ones of said secondary stations, characterized in that, responsive to receipt of a plurality of traffic information to be transmitted respectively to a plurality of said secondary stations including said one secondary station, said means for transmitting (a) during a given said control time slot, transmits at least two identifier signals respectively identifying said ones of said secondary stations; - (b) for each identifier signal transmitted, provides a respective location code, independent of characteristics of the respective identifier signal, corresponding to a respective traffic time slot within a succeeding traffic time period; and
(c) during each said respective traffic time slot transmits said traffic information for the respective secondary station identified by said respective identifier signal. - View Dependent Claims (12, 13, 14, 15, 16)
- (b) for each identifier signal transmitted, provides a respective location code, independent of characteristics of the respective identifier signal, corresponding to a respective traffic time slot within a succeeding traffic time period; and
Specification