TDMA radio network with provision for a group call channel for designated satellite stations
First Claim
1. A radio transmission system comprising at least one base station, each base station having a radio coverage zone, and a plurality of satellite stations at least one of which is situated in a radio coverage zone of said one base station, each base station being operative to transmit information to a satellite station in its coverage zone via an assigned time division multiplex (TDM) time slot in a down frequency transmission channel, each satellite station being operative to transmit information via an assigned TDM time slot in an up frequency transmission channel;
- characterized in that, upon request by said one satellite station, said one base station is operative to assign a particular TDM time slot in one of said frequency channels as a group call channel for exchange of information between satellite stations in a designated group which includes said one satellite station, without further intervention by said one base station.
1 Assignment
0 Petitions
Accused Products
Abstract
The radio transmission system includes at least one base station (RA or RB) and at least one satellite station (M1, . . . , M7) situated in a coverage zone (ZA, ZB) of the base station in which the base station can send information to a satellite station by a down transmission channel (FRAM), while one transmission channel is used in which the satellite stations are authorized to transmit. For establishing a group call at the request of a satellite station, the base station allocates a group call channel to the requesting station so that exchange of information can take place directly between the mobile stations which are included in the group call.
12 Citations
3 Claims
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1. A radio transmission system comprising at least one base station, each base station having a radio coverage zone, and a plurality of satellite stations at least one of which is situated in a radio coverage zone of said one base station, each base station being operative to transmit information to a satellite station in its coverage zone via an assigned time division multiplex (TDM) time slot in a down frequency transmission channel, each satellite station being operative to transmit information via an assigned TDM time slot in an up frequency transmission channel;
- characterized in that, upon request by said one satellite station, said one base station is operative to assign a particular TDM time slot in one of said frequency channels as a group call channel for exchange of information between satellite stations in a designated group which includes said one satellite station, without further intervention by said one base station.
- View Dependent Claims (2, 3)
Specification