Patent ID: 8457073
Filing Date: 2013-06-04
Classification: H04B,H04W

Abstract:
1. A Base Station (BS) apparatus in a multi-hop relay Broadband Wireless Access (BWA) system, comprising: a receiver for receiving an activecast request message from a target Relay Station (RS), wherein the activecast request message is received if a strength of a signal, received from a Mobile Station (MS) to the target RS, measured by the target RS, is greater than or equal to a threshold; a controller for determining whether to perform activecasting which is a simultaneous multicasting scheme for the purpose of minimizing Relay Station to Relay Station (RS-to-RS) handover delay, on the MS performing RS-to-RS handover, upon receiving the activecast request message; a scheduler for allocating multicasting resources by taking into consideration a channel condition between the MS and a serving RS, when it is determined to perform activecasting; and a transmitter for multicasting a packet, which is to be transmitted to the MS, to the target RS and the serving RS by using the allocated multicasting resources.