1 A Multimedia Architecture for 802.11b network Berthou, P.; Gayraud, T.; Alphand, O.; Prudhommeaux, C.; Diaz, M.; Wireless Communications and Networking,

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Presentation transcript:

1 A Multimedia Architecture for b network Berthou, P.; Gayraud, T.; Alphand, O.; Prudhommeaux, C.; Diaz, M.; Wireless Communications and Networking, WCNC IEEE, Volume: 3, March 2003 Page(s): NCNU CSIE MCL network group, Group Meeting

2 Outline Introduction Introduction Multimedia Communication in Multimedia Communication in Wireless Networks Wireless Networks A Multimedia Architecture For b A Multimedia Architecture For b Performance Evaluation Performance Evaluation Conclusion Conclusion

3 Multimedia Communication in Wireless Networks Multimedia communication QoS requirements Multimedia communication QoS requirements Quality of service in b networks Quality of service in b networks (1) Dynamic Rate Shifting (1) Dynamic Rate Shifting (2) A difficult cohabitation btw low and (2) A difficult cohabitation btw low and high rates high rates (3) drawbacks for multimedia (3) drawbacks for multimedia communication communication

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10 i.e Mbps/user for delivering the same amount of data (1534 bytes)

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12 A Multimedia Architecture For b Disabling DRS in multimedia context Disabling DRS in multimedia context Performance Enhancing Proxy to restore QoS Performance Enhancing Proxy to restore QoS A strategic location A strategic location Limitation Limitation

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15 Performance Evaluation testbed: testbed: 11 Mbps WLAN + wire WAN 11 Mbps WLAN + wire WAN network delay: network delay: WLAN: 10ms, WAN: 100ms WLAN: 10ms, WAN: 100ms every 10s, reliability decreased every 10s, reliability decreased (BER:0  ) (BER:0  ) TCP throughput: TCP throughput: # delivered packets /s # delivered packets /s

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19 Conclusion The b dynamic rate shifting mechanism is proposed to be disabled and replaced by a Performance Enhancing Proxy at the wireless network edge. The b dynamic rate shifting mechanism is proposed to be disabled and replaced by a Performance Enhancing Proxy at the wireless network edge. This multimedia architecture could be a cheap solution for the already deployed b networks.