Supporting transmission of stream media over wireless mobile networks is often difficult because packets may be lost due to the rerouting of packets during handoff, and also because bursts of packet loss may occur during handoff due to the disparity in the amount of available bandwidth among different cells. In this paper, we propose an end-to-end multipath handoff scheme that provides smooth handoff for stream media in wireless networks with different amounts of available bandwidth from cell to cell. In the proposed scheme, multiple paths are established during handoff to reach a mobile destination node. The stream media sources are equipped with an adaptive multilayer encoder, and important layers in the encoded video stream are duplicated and transmitted over multiple paths during handoff. The effectiveness of the proposed multipath handoff scheme is verified and compared with existing schemes through extensive simulations. The simulation results show that the proposed scheme provides higher throughput and better quality for stream media.
Bibliographical noteFunding Information:
Manuscript received February 14, 2003; revised October 15, 2003. This work was supported in part by the National Science Foundation under Grant ANI-0083074 and Grant ANI-9903427, in part by the Defense Advanced Research Projects Agency (DARPA) under Grant MDA972-99-1-0007, in part by AFOSR under Grant MURI F49620-00-1-0330, and in part by grants from the University of California MICRO Program, California State University of Northridge Research and Sponsored Projects, Hitachi, Hitachi America, Novell, Nippon Telegraph and Telephone Corporation (NTT), NTT Docomo, Fujitsu, Korea Research Foundation through BK21, and NS-Solutions. This paper was presented in part at WMASH’03, San Diego, CA, September 2003.
- Congestion avoidance
- Multilayer video encoder
- Slow start
- Stream media
- Wireless networks