上游充通大￥ SHANGHAI JIAO TONG UNIVERSITY Mobility Weakens the Distinction between Multicast and Unicast xinbing I Wang Dept.of Electronic Engineering Shanghai Jiao Tong University Shanghai,China
Mobility Weakens the Distinction between Multicast and Unicast Xinbing Wang Dept. of Electronic Engineering Shanghai Jiao Tong University Shanghai, China
Outline 上浒充通大学 SHANGHAI JIAO TONG UNIVERSITY ▣Introduction >Previous works Motivation System model and main idea The impact of mobility on capacity for restricted mobility model The impact of mobility on delay for restricted mobility model ▣Discussion Conclusion and future direction 2
2 Outline ❑ Introduction ➢ Previous works & Motivation ❑ System model and main idea ❑ The impact of mobility on capacity for restricted mobility model ❑ The impact of mobility on delay for restricted mobility model ❑ Discussion ❑ Conclusion and future direction
Previous Works Motivation 上浒充通大￥ What is multicast? SHANGHAI JIAO TONG UNIVERSITY One source to m destinations oo Data copy is necessary One copy may be sent to multiple destinations The number of flows is reduced comparing with unicast 0 0o0 O a Xiangyang Li [1] [1]X.Li,"Multicast Capacity of Large Scale Wireless Ad Hoc Networks",IEEE/ACM Trans.Networking,Vol.17,No.3,pp. 950-961,Jan.2008.(citation:234) 3
Previous Works & Motivation What is multicast? ➢ One source to m destinations 3 ✓ Data copy is necessary ✓ One copy may be sent to multiple destinations ✓ The number of flows is reduced comparing with unicast Xiangyang Li [1] [1] X. Li, “Multicast Capacity of Large Scale Wireless Ad Hoc Networks”, IEEE/ACM Trans. Networking, Vol.17, No. 3, pp. 950-961, Jan. 2008.(citation:234)
Previous Works Motivation 上浒充通大￥ The multicast uses SHANGHAI JIAO TONG UNIVERSITY Video sources Video clients Live Video distribution ntemet and mobile networks Collaborative groupware Periodic Data Delivery- Stock quotes,sports scores, "Push"technology magazines,newspapers,adverts Hub site Any Applications with Server/Web-site multiple receivers replication (1-to-many) Branch Branch office Branch office office Resource Discovery Reducing Network/ more than multiple Resource Overhead point-to-point flows Distributed Interactive Wargames,virtual reality Simulation (DIS) 4
Previous Works & Motivation The multicast uses 4 Any Applications with multiple receivers (1-to-many) Collaborative groupware Reducing Network/ Resource Overhead Live Video distribution Server/Web-site replication Resource Discovery Periodic Data Delivery – "Push" technology Stock quotes, sports scores, magazines, newspapers, adverts more than multiple point-to-point flows Distributed Interactive Simulation (DIS) Wargames, virtual reality Video sources Internet and mobile networks Video clients Hub site Branch office Branch office Branch office
Previous Works Motivation 上游充通大 The essential difference between multicast and unicast SHANGHAI JIAO TONG UNIVERSITY The flow aggregation in multicast case (multiple flows with different destinations can be aggregated,and therefore only one flow is enough) Number of flows multi-unicast multicast > Due to the flow aggregation,the number of flows is reduced (11-5 in this example)by the multicast scheduling comparing with the multi-unicast case. 5
Previous Works & Motivation The essential difference between multicast and unicast ➢ The flow aggregation in multicast case (multiple flows with different destinations can be aggregated, and therefore only one flow is enough) ➢ Due to the flow aggregation, the number of flows is reduced (11→5 in this example) by the multicast scheduling comparing with the multi-unicast case. 5 multi-unicast multicast Number of flows