Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Utility Patent
1998-03-24
2001-01-02
Trost, William G. (Department: 2744)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S519000, C455S522000, C455S524000
Utility Patent
active
06169906
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to communication systems, including but not limited to transmitting messages in a dispatch call.
BACKGROUND OF THE INVENTION
The basic operation and structure of a two-way wireless communication system, such as a cellular telephone system or a land mobile communication system, is well known. Two-way wireless communication systems typically comprise one or more communication units (e.g., vehicle-mounted or portable communication units in a land mobile system and communication unit/telephones in a cellular system), also known as mobile stations, and one or more repeaters, also known as base stations or base transceiver stations, that transceive information via radio frequency (RF) communication resources. These communication resources may be narrow band frequency modulated channels, time division multiplex slots, frequency pairs, code division multiple access (CDMA) resources, and so forth. Two-way wireless communication systems may be organized as trunked communication systems, where a plurality of communication resources is allocated amongst a group of users by assigning the repeaters on a communication-by-communication basis within an RF coverage area.
Two-way wireless communication systems service many different types of calls, including one-to-one calls, telephone interconnect calls, and dispatch calls. Dispatch calls may be useful when it is desired for a large number of users to communicate at one time. Many cellular systems, however, do not support dispatch calls because dispatch calls are generally one-to-many calls, that may require a large number of communication resources in order to reach all of the members of the talkgroup for which the dispatch call is targeted. For example, if a particular system has 10 cells, and at least one member of the targeted talkgroup is present in each of those cells, then a communication resource from each cell must be allocated to support the dispatch call. Further, dispatch calls may be longer calls, often reaching lengths of 15 or more minutes, making such allocation of a communication resource very costly in terms of resources.
Accordingly, there is a need for a method of providing dispatch calls on a two-way wireless communication system, and in particular a two-way wireless cellular communication system, such that a more efficient use of communication resources support the dispatch call.
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Davis Temica M.
Jacobs Jeffrey K.
Lukasik Susan L.
Motorola Inc.
Trost William G.
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