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Wireless Burst Switching

Wireless Burst Switching. Simulation and Analysis Ming-fei Guo and Yi Zhang Supervisor: Min-you Wu. Definition. WBS : Wireless Burst Switching Interact between TCP and physical layers for data transmission over WBS. TCP layer. IP layer. W BS layer. Modified wireless MAC.

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Wireless Burst Switching

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  1. Wireless Burst Switching Simulation and Analysis Ming-fei Guo and Yi Zhang Supervisor: Min-you Wu

  2. Definition • WBS : Wireless Burst Switching • Interact between TCP and physical layers for data transmission over WBS TCP layer IP layer WBS layer Modified wireless MAC

  3. Burstification of IP packets into Data Bursts (DBs) IP packets BHP BHP BHP Processing of Burst Header Packets (BHPs) SituationWireless Burst Switching : Optimize burst size IP router Channel Group (CG) Wireless link WBS edge router control (CCG) data (DCG) WBS core router

  4. Bursts disassembly DB DB DB IP packets DBs are routed in the domain SituationWireless Burst Switching IP router WBS Ingress edge router WBS core router

  5. Simulation design(1) • Edge routers • Divided into ingress node and egress node, responsible for burst-assembly and disassembly respectively • Packets on a common ingress node to a common egress node are aggregated into burst • Burst generation is triggered upon either the max burst size or the burst time-out • Burst header packet (BHP) is sent ahead of corresponding data burst for an offset time

  6. Simulation design(2) • Core routers • Process BHP to get information about the coming data burst • Search a specific list to see if the reservation for the data burst can be made • If it is availble, route for BHP according to the routing table formed by shortest path routing algorithm and set neighbors’ lists • Otherwise buffer BHP to wait for an vacancy on the list and modified the offset time

  7. Simulation design(3) • Not based on 802.11, but a simplified mac • 802.11 is a contention-based protocol • Wbs requires link scheduling and reservation • A simple mac is used to realize basic mac layer functions and provides an reservation mechanism, which allocates last available unused channel to the burst • Use multiple channels • Control header and data use different channels • MIMO is supposed to be available

  8. Simulation result Two configurations

  9. 3-node topology with multiple TCP agents(1) Burst- assembly time=1ms Throughput for 100Mbps sessions

  10. 3-node topology with multiple TCP agents(2) Burst- assembly time=1ms Throughput for 20Mbps sessions

  11. 3-node topology with multiple TCP agents(3) Burst drop probability=0.0002 Delay for 100Mbps sessions

  12. 3-node topology with multiple TCP agents(3) Burst drop probability=0.0002 Delay for 20Mbps sessions

  13. 8-node topology(1)

  14. 8-node topology(2) Burst size=20KByte Throughput for 100Mbps sessions

  15. 8-node topology(3) Burst size=20KByte Throughput for 100Mbps sessions

  16. Conclusion • Identify the impact of data burst length,burst assembly time and data burst drop rate • Higher drop probabilities resulted in poorer performance and degradation is severe for DP as low as 0.003 • Lower drop probabilities, increasing burst size resulted in higher throughput and increased delay • For higher drop probabilities, there is no significant gain with increasing burst size • Increasing timeout value does not result in significant performance degradation for three node topology with multiple TCP agents, while some degradation is observed for the eight-node toplogy

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