An enhanced HeRO scheme for VoD with heterogeneous receivers in wireless networks

In Video-on-Demand system, periodic broadcasting is the most bandwidth-efficient method to provide clients with popular videos. Many broadcasting schemes have been proposed to reduce server´s bandwidth as well as client´s waiting time. However, most of the schemes assume clients to have enough reception bandwidth, which is impractical since client´s reception bandwidth varies, especially in wireless network environment. In order to solve this heterogeneous receiving problem, Reception Bandwidth Adaptable (RBA) schemes and Reception Bandwidth Limited (RBL) schemes are presented. In this paper, we propose an Enhanced Heterogeneous Receiver-Oriented scheme (HeRO-3) to solve this problem. By revising the channel design of the FB scheme part in HeRO scheme, clients with 3 or more reception channels can watch the video with much lower waiting time. Also, similar to HeRO scheme, it maintains a low buffer requirement of about 25% of video size. The performance result of HeRO-3 scheme is also presented and compared with other heterogeneous receiving schemes in this paper.