Layered video multicast using fractional frequency reuse over wireless relay networks

Abstract

Nowadays, multimedia services over wireless networks are increasingly popular. With multicast, many mobile stations can join the same video group and share the same radio resource to efficiently increase frequency utilization. However, users may be located at different positions, and so suffer different degrees of path loss and interference, and receive a different signal-to-interference and noise ratio (SINR). Users at the cell-edge receiving a lower SINR may degrade the multicast efficiency. In this article, we propose four schemes that consider fractional frequency reuse (FFR) over relay networks in multi-cells. With FFR, users close to a base station (BS) are given more resources to improve the video quality. An efficient resource allocation scheme is also proposed. Compared to the conventional relay scheme, the proposed schemes can provide over 10% more video layers for all users and give better video quality for users near the BS.

Joint Resource Allocation and User Association for SVC Multicast Over Heterogeneous Cellular Networks

“…Their study did not involve MCS selection, and the target networks were two-hop relay networks. Lee et al [11] proposed a resource allocation scheme to increase frequency utilization, and they assumed that all RSs used the same MCS. Sheu et al [12] proposed an approximation algorithm for two-hop relay networks in which the data rate requirement for each user and the recipient user group of each BS/RS are predetermined.…”

“…⃗ m is not assigned to video layer l A dynamic programming based algorithm incorporating Eqs (11). to(13) can be easily implemented; we omit the details herein due to lack of space.The recursive steps show that µ( ⃗ m, l, ⃗ b) will be calculated at most once for each valid MCS tuple ⃗ m, 1 ≤ l ≤ L,and [0 0] ≤ ⃗ b ≤ [αB (1 − α)B],and the count for valid MCS tuples can be viewed as O(M ).…”