On Maximizing the Throughput of Opportunistic Multicast in Wireless Cellular Networks with Erasure Codes

摘要

In this paper, we focus on designing opportunistic multicast scheduling (OMS) schemes that can maximize per-user throughput in a wireless network using erasure codes. We first design a maximal OMS (M-OMS) scheme for homogeneous networks where users experience i.i.d. channel conditions. We then build an analytical model to study the throughput performance of M-OMS. Given the channel statistical information of the users, we derive the upper bound on per-user throughput by solving a semidefinite optimization problem. For heterogeneous networks with non-i.i.d. channel conditions, we propose a modified M-OMS scheme which uses the average user channel condition as the weighting factor to improve the fairness among users. simulation results show that on average our proposed M-OMS schemes have about 15% throughput gain over the existing OMS scheme under the i.i.d. case; while for the non-i.i.d. case, the throughput gain can be as high as 100%.