Wireless burst switching
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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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Wireless burst switching

Wireless Burst Switching

Simulation and Analysis

Ming-fei Guo and Yi Zhang

Supervisor: Min-you Wu


Definition

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


Situation wireless burst switching optimize burst size

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


Situation wireless burst switching

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


Simulation design 1

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


Simulation design 2

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


Simulation design 3

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


Simulation result

Simulation result

Two configurations


3 node topology with multiple tcp agents 1

3-node topology with multiple TCP agents(1)

Burst- assembly time=1ms

Throughput for 100Mbps sessions


3 node topology with multiple tcp agents 2

3-node topology with multiple TCP agents(2)

Burst- assembly time=1ms

Throughput for 20Mbps sessions


3 node topology with multiple tcp agents 3

3-node topology with multiple TCP agents(3)

Burst drop probability=0.0002

Delay for 100Mbps sessions


3 node topology with multiple tcp agents 31

3-node topology with multiple TCP agents(3)

Burst drop probability=0.0002

Delay for 20Mbps sessions


8 node topology 1

8-node topology(1)


8 node topology 2

8-node topology(2)

Burst size=20KByte

Throughput for 100Mbps sessions


8 node topology 3

8-node topology(3)

Burst size=20KByte

Throughput for 100Mbps sessions


Conclusion

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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