Patent ID: 8750247
Filing Date: 2014-06-10
Classification: H04W

Abstract:
1. A mobile communication system comprising: a base station which applies a high-speed downlink packet transmission scheme in downlink and an enhanced uplink packet transmission scheme in uplink between the base station and one or more mobile stations, wherein a serving cell managed by the base station and providing the high-speed downlink packet transmission scheme for a specified mobile station and a serving cell managed by the base station and providing the enhanced uplink packet transmission scheme for the specified mobile station are configured to be changed, based on a cell change notification signal, to a new serving cell managed by a new base station capable of communicating with the specified mobile station using at least the high-speed downlink packet transmission scheme, wherein the cell change notification signal is transmitted by the specified mobile station when a condition for changing the serving cell in the high-speed downlink packet transmission scheme is satisfied whether or not a condition for changing the serving cell in the enhanced uplink packet transmission scheme is satisfied, wherein the cell change notification signal includes a request to change the serving cell used in the high-speed downlink packet transmission scheme for the specified mobile station and a request to change the serving cell used in the enhanced uplink packet transmission scheme for the specified mobile station, wherein the new base station communicates with the specified mobile station using the enhanced uplink packet transmission scheme in a case where the new base station is also capable of communicating using the enhanced uplink packet transmission scheme, and wherein the new base station communicates with the specified mobile station using a non-enhanced uplink packet transmission scheme in a case where the new base station is not capable of communicating using the enhanced uplink packet transmission scheme.