Supporting Multiple Content Variants in the Multimedia Broadcast Multicast Service

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Supporting Multiple Content Variants in the
Multimedia Broadcast / Multicast Service

• G. Xylomenos, K. Katsaros
• Athens University of Economics and Business
• IST B-Bone Project

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Overview

• MBMS fundamentals
• MCV MBMS
• Content variant generation/forwarding
• Performance evaluation analysis
• Performance evaluation simulation
• Performance evaluation CN
• Performance evaluation RAN
• Conclusions

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MBMS fundamentals

• Multimedia Broadcast / Multicast Service
• Part of 3GPP Release 6
• Broadcast and Multicast modes
• Multicast is subscription oriented
• Allows resource sharing in CN and RAN
• CN hierarchical routing
• RAN PtP or PtM radio bearers
• Service properties are defined by the BM-SC
• All subscribers receive the same content

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MCV MBMS

• Multiple Content Variant (MCV) MBMS
• Extension of standard MBMS
• Multiple variants of the same content
• Satisfies different user terminals
• Satisfies different user budgets
• More receivers means more revenues
• The BM-SC advertises available variants
• Signaling extensions
• The user simply asks for one variant
• Extra field in request messages
• Join, Create Context Registration

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MCV MBMS

• UE context per user per group state
• Bearer context per group state
• Each node asks its parent for data
• Request a variant to satisfy all your children
• Use layered coding or transcoding

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Content variant generation/forwarding

• Layered coding
• Encoding at the sender only
• Base layer and enhancement layers
• Each variant consists of some layers
• Drop layers to reduce quality
• Transcoding
• Encoding at each node
• Each variant is transcoded from the original
• Transcode with fewer bits to reduce quality
• Simulator implementation
• Three variants (LQ/MQ/HQ) with layered coding

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Performance evaluation analysis

• Scope user plane overhead
• Control plane see related work
• Alternatives for comparison
• L/M/HQ MBMS send all layers to all UEs
• LQ MBMS send base layer only to all UEs
• MCV MBMS selective forwarding of layers
• Analytical evaluation packets received
• Separate analysis for CN RAN
• Parameterized by number of nodes
• Application to specific topology
• Same parameters as in the simulation

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Performance evaluation simulation

• Simulator evaluation Opnet 11.0
• Detailed implementation of MCV MBMS
• Simple tree topology with 1 40 UEs
• Statistics for total and per node traffic

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Performance evaluation CN

• MCV MBMS closer to L/M/HQ MBMS
• Close agreement with analysis for gt 10 UEs

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Performance evaluation RAN

• MCV MBMS closer to LQ MBMS
• Perfect match between analysis and simulation

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Conclusions

• MCV MBMS multiple content variants
• Simple extension of standard MBMS
• Satisfies additional users with low cost
• Especially economical over the RAN
• Related work control plane overhead
• Analytical results (European Wireless 2006)
• Simulation results (IST Summit 2006)
• Future work
• Simulate detailed power consumption
• Calculate bandwidth savings over WCDMA

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Thank you!Any questions?