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Broadcast channel seizure with allocated single traffic channel per occupied cell in a cellular system
| Details |
Inventors: Yarwood, Anthony Charles;
Assignee: British Telecommunications public limited company (London, GB)
Primary Examiner: Eisenzopf; Reinhard J.
Assistant Examiner: Bhattacharya; Sam
Attorney, Agent or Firm: Nixon & Vanderhye P.C.
In a cellular radio system the facility is provided for a call to be broadcast from a control center (for example an emergency service controller), or from any mobile unit to all of the others. Each cell allocates a single channel to the broadcast service, irrespective of the number of mobile units in the cell. This allows more efficient use of the available channels than the use of a separate channel for each mobile unit. In one embodiment no channel is allocated to a cell unless at least one mobile unit responds to a paging signal in that cell. Paging may continue throughout a broadcast call to allow a channel to be allocated when a mobile unit enters a previously unoccupied cell or to allow release of a channel should all mobiles leave a previously occupied cell. The broadcast facility can be provided on a cellular network which also supports other mobile units which do not receive the broadcast service, and whose operation is not affected by it. |
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DETAILED DESCRIPTION According to a first aspect of the invention, there is provided a cellular radio system comprising a switching center and a plurality of radio base stations each having an associated plurality of traffic channels for servicing an associated cell, and a plurality of mobile units, characterized in that for each of a plurality of the radio base stations one of the associated channels can be dedicated to a broadcast service, and a selected group of at least some of the mobile units each have means for establishing the channel associated with the broadcast service, so that a call from the switching center can be transmitted by a base station over the dedicated channel to the selected group of mobile radio units within the respective cell.
In one embodiment of the invention, each base station within the cellular system has a channel permanently dedicated to the broadcast service.
In an alternative embodiment each base station comprises means for transmitting a paging signal, each mobile unit of the selected group having means for transmitting a response to the paging signal, and means for dedicating a channel to the broadcast service at only those base stations which receive one or more such responses.
According to a second aspect of the invention, there is provided a cellular radio system comprising: a switching center and a plurality of radio base stations each having an associated plurality of traffic channels for serving an associated cell, and a plurality of mobile units, characterized in that for each of a plurality of the radio base stations one of the associated channels can be dedicated to a broadcast service, and a selected group of at least some of the mobile units each have means for establishing the channel associated with the broadcast service, so that a call from the switching center can be transmitted by a base station over the dedicated channel to the selected group of mobile radio units within the respective cell, each base station comprising means for transmitting a paging signal and means for dedicating a channel to the broadcast service at only those base stations which receive one or more responses to the paging signal, each mobile unit of the selected group having means for transmitting such a response to the paging signal
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