Dynamic Frequency Allocation in OFDMA Cellular Networks

Abstract

The future mobile communication system can support not only voice but also multimedia applications such as data, image and video. It requires greater resources than the voice-oriented mobile system. We propose user and sub-channel priority based resource allocation for mobile multimedia services in the OFDMA systems. Our method is able to guarantee QoS continuity of realtime services and carry the maximum number of non-realtime subscriber. Simulation is focused on total throughput and blocking rate. The simulation results show that our proposed method provides a better performance than the conventional method.

Resource Allocation Scheme to Support QoS in Mobile Multimedia Networks

“…In addition, macrocells and femtocells can share some bands. As we consider an orthogonal frequencydivision multiple access (OFDMA)-based cellular network, these bands are divided into subchannels and further divided into frames, which are shown in Figure 2 [11][12][13][14][15]. ma R , sh R , and fe R denote resources dedicated to macrocells, resources shared among macrocells and femtocells, and resources dedicated to femtocells, respectively.…”

“…In order to prevent a shortage of resources in the face of handovers, our proposed scheme decreases the usage rate permitted to user services through secondary load control [14][15]. Figure 3…”

“…Primary load control is executed as shown in Figure 4 if resources run out at the occurrence of a handover [14][15]. It aims to secure subchannels for handover traffic of LL or LH class services by adjusting the transmission rate of HL or HH class services.…”