earticle

영어

In WiMAX networks, a base station (BS) sends DL-MAP and UL-MAP messages through downlink channel to represent transmission information, such as the size of slots/symbols and modulation/coding scheme (MCS), etc., for each of downlink and uplink data bursts. However, the MAP messages act as overheads. Particularly, in a service flow (SF) with the unsolicited grant service (UGS) schedule type, it is inefficient to allocate radio resources for transmitting the MAP messages on every grant interval because the grant interval and the requested bandwidth are fixed in UGS. In this paper, we propose an adaptive scheme using policy and charging control (PCC) architecture to reduce the MAP overheads in WiMAX networks, and prove the network capacity enhancements in the view of VoIP services.