後卓越計畫 進度報告 楊舜仁老師實驗室 2007.06.04
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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 - PowerPoint PPT PresentationTRANSCRIPT
Slide 1
後卓越計畫進度報告楊舜仁老師實驗室2007.06.04
Slide 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.
Layered Coder
D
D
D
+
+
Layer 1
Layer 2
Layer 3
32kbps
96kbps
64kbps
Slide 3
The proposed DC Scheme
Layer 1 (Base Layer) Data
Layer 3 Data
Layer 2 Data
Region with , and
Region with
Region with and
Service Class 3
Service Class 1
Service Class 2
UE1
UE5
UE4
UE6UE3
UE2
DCH
DCH*2
DCH
R1
R3
R2
UE1
UE2
UE5
UE4
UE6UE3
UE1
UE2
UE5
UE4
UE6UE3 R1
R3
R2
Scheme I Scheme II Our Scheme
Slide 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)
Slide 5
Analytic Model – Region-Independent (SCO) The power consumption of DCH channels is assumed to be insensitive to the r
egions 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.
n )(,
ijm
h )(,i
jh
m/1n/1
n/1 )(/1 im
New call arrival rateNew MBMS session arrival rate in region i
Arrival rate of handoff callsArrival rate of handoff MBMS sessions for class-j devices to region i
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 !!
Slide 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
)(in
)(/1 in
Slide 7
Comparison of Analytical model and Simulation