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後卓越計畫 進度報告 楊舜仁老師實驗室 2007.06.04

後卓越計畫 進度報告 楊舜仁老師實驗室 2007.06.04. Motivation. An MBMS source entity shall provide multiple classes of service quality for a single MBMS stream due to Device heterogeneity Diversity of subscriber preference Other issues such as change of available bandwidth

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後卓越計畫 進度報告 楊舜仁老師實驗室 2007.06.04

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  1. 後卓越計畫 進度報告 楊舜仁老師實驗室 2007.06.04

  2. Motivation • An MBMS source entity shall provide multiple classes of service quality for a single MBMS stream due to • Device heterogeneity • Diversity of subscriber preference • Other issues such as change of available bandwidth • Scalable coding technique cab be adopted for MBMS service delivery. • How to properly transmit the layer-encoded MBMS data through UMTS radio network is much challenging.

  3. The proposed DC Scheme Scheme I Scheme II Our Scheme

  4. The Channel Allocation Policies of our DC Scheme • The abuse of the DCH channels would impact the system performance especially for normal phone calls. • In order to allocate the DCH appropriately, the channel allocation for our DC scheme should be priority-based. • Phone calls are assigned to a higher priority than MBMS sessions. • Preemption : Reclaim the allocated DCH from an ongoing MBMS session • Re-allocation : Distribute the released DCH resources to one or more MBMS sessions . • Four policies to maintain the preemption and re-allocation lists • Random • First-Come-First-Serve (FCFS) • Service-Class Oriented (SCO) • Power-Aware SCO (PAS)

  5. Analytic Model – Region-Independent (SCO) • The power consumption of DCH channels is assumed to be insensitive to the regions of the DCH users. • The overall DCH resources of a NodeB can be modeled based on the channel viewpoint. • Assumptions and notations • 3 service classes are provided. • Besides the three FACHs, a NodeB supports c DCH channels. New MBMS session arrival rate in region i New call arrival rate Arrival rate of handoff MBMS sessions for class-j devices to region i Arrival rate of handoff calls Mean call holding time Mean MBMS session holding time in region i Mean cell residence time Mean region residence time for MBMS sessions in region i All exponential distributed !!

  6. Analytic Model – Region-Dependent (PAS) • The power consumption of DCHs is region-sensitive. • Assumptions • Besides those allocated for the three MBMS FACH channels, a NodeB supports total PWt power resources. • The power required of supporting a DCH for a phone call in region i is • The power required of supporting a DCH for a MBMS session in region i is The arrival rate of new calls to region i of a cell The mean residence time of a phone-call user in region i

  7. Comparison of Analytical model and Simulation

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