Patent ID: 6909898
Filing Date: 2005-06-21
Classification: H04B,H04W

Abstract:
1. A method for transferring data in a communication system, the communication system comprising a central station, a plurality of mobile units, and a plurality of radio base stations, wherein the central station communicates with each of the plurality of mobile units, the method comprising: receiving from each mobile unit registration information identifying a radio base station currently in communication with the mobile unit; storing the registration information in a registration database located at the central station, such that the registration database stores information identifying the particular radio base station currently communicating with each of the plurality of mobile units; receiving a request to transfer data to a selected group of the plurality of mobile units; transferring data from the central station to the selected group of mobile units using the radio base stations identified by the registration information stored in the registration database for each mobile unit in the selected group, and wherein the transferring step further includes: transmitting to a particular mobile unit a call request identifying data that the central station requests to transfer; receiving an acknowledgment signal from the particular mobile unit indicating whether the particular mobile unit can receive the requested data; and transferring the requested data to the mobile particular unit when the acknowledgment signal indicates that the particular mobile unit can receive the requested data.