Patent ID: 7266381
Filing Date: 2007-09-04
Classification: H04W

Abstract:
1. A method of filtering calls between a mobile network provided with frequency channels and mobile telephones registered with this mobile network, when the mobile telephones are located in a control area (N 0 ), the mobile network comprising a plurality of cells (Zi) associated with respective relays (Ri) each transmitting data specific to their associated cell through a beacon channel among one of the frequency channels of the mobile network, the method comprising the steps of: parametering in neighboring cells of the control area of a frequency channel of the mobile network corresponding to a transmission channel of a transmitter (D) associated with said control area; transmitting on a transmission channel of said transmitter (D) through a BCCH logical channel; accepting the transmission of said transmitter by the mobile telephones located within said control area (N neutralizing the incoming calls to mobiles having selected/reselected the transmitter of said control area; and associating no receiver with said transmitter (D), so that when a mobile telephone transmits an access request on the RACH logical channel of said transmission channel, a reselection of neighboring cells will be automatically initiated, for want of any response, said transmitter (D) being associated with reception means suitable for decoding the contents of random access messages transmitted by the mobile telephones located within the control area (N wherein said transmitter is never connected to the mobile network so as to operate completely autonomously, the reception means associated with the transmitter (D) are capable of identifying the CHANNEL REQUEST type access request messages transmitted by a mobile telephone seeking to be connected to the mobile network, the transmitter is also associated with a memory including a call types file, and with means for determining the reason for the access request of a mobile telephone, and the transmitter receiving a CHANNEL REQUEST type access request: so that the outgoing call from the mobile telephone will only be routed to the mobile network if the reason for the call corresponds to a determined reason.