An Enhanced Feedback-Base Downlink Packet Scheduling Algorithm for Mobile TV in WIMAX Networks

Abstract

With high speed access network technology like WIMAX, there is the need for efficient management of radio resources where the throughput and Qos requirements for Multicasting Broadcasting Services (MBS) for example TV are to be met. An enhanced feedback-base downlink Packet scheduling algorithm that can be used in IEEE 802.16d/e networks for mobile TV "one way traffic"(MBS) is needed to support many users utilizing multiuser diversity of the broadband of WIMAX systems where a group of users(good/worst channels) share allocated resources (bandwidth). This paper presents such enhanced downlink packet scheduler for mobile TV traffics in IEEE 806.16, whereby network Physical Timing Slots (PSs) resource blocks are allocated in a dynamic way to mobile TV subscribers considering the Channel State information CSI (CQI) feedback. It also considers users with worst/weak channels with the aim of improving system throughput while system coverage is being guaranteed. Change in the PSs bandwidth allocation to users and different number of users per cell sector are use to check the algorithm. Simulation results show our proposed algorithm performed better than other algorithms (blind algorithms) in terms of improvement in system throughput performance. Further work like above can be done for another traffic e.g. gaming traffics utilizing broadband technology of WIMAX.

IEEE 802.16 E&M SYSTEMS BANDWIDTH RESOURCE ALLOCATION PERFORMANCE INVESTIGATION

“…The enhanced WiMAX system uses some advanced technologies such as MIMO technology, OFDMA (Orthogonal Frequency Division Multiple Access), and AMC (Adaptive Modulation and coding), hence by using the previous technologies can affect and enhance the bandwidth usage. Due to the increasing size of users which forces the system to allocate enough bandwidth and resources for their demanding services [3], therefore, it will use the full link bandwidth for The high priority applications and makes other applications starve for more bandwidth resulting in a high increase in the packet dropping.…”

“…It can be shown from [3] and [4] that the approaches in both IEEE 802.16 E & M mainly focus on increasing the service priority and serve the data of RT applications first. While giving the non-real-time NRT applications some priority for its data services as much allowed as possible, in this paper a method will be used and demonstrated named as a Minimum Resource Allocation (RA) which it means allocating and reserving for the required bandwidth, every service flow as its minimum demand, but still one of the downsides of this technique is that the remaining unused bandwidth will be lost if it will not be reserved or used.…”