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Channel conditions of Mobile Stations (MSs) are time variant and location dependent due to fading and shadowing multiuser diversity effect. Since lot of users independently lacked, within the given time some division of users will likely have channel conditions strongly. The scheduling opportunistic takes advantage of the instantaneous channel conditions to derive the instantaneous data rates of each MS. Superposition Coding (SC) provides a channel gain threshold for enhanced layer based on user selection ratio and power allocation coefficient which can optimize system throughput dynamically. It provides enhanced QoS and efficiency for layered video multicast over Mobile WiMAX based on an opportunistic multicasting optimization formulation, to Minimizes resource usage and the scheduled users are determined to maximize full utility.
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