In this paper we compare strategies for joint radio link buffer management and scheduling for wireless video streaming. Based on previous work in this area [8], we search for an optimal combination of scheduler and drop strategy for different end-to-end streaming options including timestamp-based streaming and ahead-of-time streaming, both with variable initial playout delay. We will show that a performance gain versus the two best drop strategies in Liebl et al. [8], i.e. drop the HOL packet or drop the packet with the lowest priority starting from HOL, is possible: Provided that some basic side-information on the structure of the incoming video stream is available, a more sophisticated drop strategy removes packets from an HOL group of packets in such a way that the temporal dependencies usually present in video streams are not violated. This advanced buffer management scheme yields significant improvements for almost all investigated scheduling algorithms and streaming options. In addition, we will demonstrate the importance of fairness among users when selecting a suitable scheduler, especially if ahead-of-time streaming is to be applied: Given a reasonable initial playout delay at the streaming media client, both the overall achievable quality averaged over all users, as well as the individual quality of users with bad channel conditions can be increased significantly by trading off fairness with maximum throughput of the system.

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based, the resource assignment in WiMAX is not frequency Abstract-In 2004 the 3GPP has started to standardize the new selective which for sure is simpler, but also less efficient. The system "Long Term Evolution". The key advantages are higher time granularity on which the resource allocation is re-decided, data rates, smaller latency, simpler network architecture and is Ims. This period is called transmission time interval (TTI) higher spectral efficiency. in LTThe worldwide first live demonstration of LTE using our realinLT e. time simulation platform was given in September 2006. From that This opens a new dimension to the MAC scheduler, time the network simulator has been continuously enhanced with compared with HSPA or WiMAX. The new degree of freedom new functionality also considering latest progress in 3GPP has to be exploited to increase spectral efficiency whilst standardization. The simulator shows the behavior of a future guaranteeing QoS for very individual users. Note that the LTE network for various scenarios, under different load scheduler is the only entity responsible for QoS, since only conditions. Real-time IP traffic is passed through the simulator . .demonstrating the user perception of future applications with sharedichannel staedubywthe MAC a r la different QoS configurations (e.g. video streaming and gaming). Concluding, the MAC scheduler will be the key to a properly In particular, the aspect of radio resource management including working system (satisfied users) with high spectral efficiency scheduling functionality is highlighted and comprehensively (satisfied mobile network operators).illustrated via an elaborate graphical user interface.ii. DEMONSTRATOR

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