End-to-end delay reduction technique for videoconferencing over wireless campus networks
Yong Liao, Xudong Chen, Guangze Xiong, Nan Sang, Hang Lei, Linghong Hu · IET International Conference on Wireless Mobile and Multimedia Networks Proceedings (ICWMMN 2006) · 2006
Videoconferencing not only needs intra-stream synchronization to ensure the reconstruction quality of the stream, but also has real time requirement to satisfy the natural interaction between participants. This paper analyzed the components of end-to-end delay in the videoconferencing over wireless campus network with the objective of understanding how to reduce the delay as much as possible. Then a network resynchronization delay reduction (NRDR) algorithm was proposed to determine the optimal queuing deadline for frames in the network resynchronization, which dominates the end-to-end delay. The NRDR synthetically considers three performance metrics: the queuing delay, the discard probability of frames due to deadline misses, and the variation of discarded frames, in the attempt to obtain a compromise between the end-to-end delay and the intra-stream synchronization quality. In the experiment, it was demonstrated that the NRDR is capable of providing the optimal synthesis performance, according to different requirements of videoconferencing participants. (4 pages)