Stored media synchronization in wireless LANs

This paper proposes two schemes for synchronization of stored voice and video media units (MUs) in wireless LANs. The schemes, called nondistinctive and distinctive, are based on interleaving of the two kinds of MU. The former does not distinguish between voice and video MUs in the interleaved stream, while the latter does. To evaluate their performance and confirm the effectiveness in comparison with the scheme of no-control, we developed an experimental system using the ALTAIR wireless LAN. The mean square error of synchronization, total pause time, throughput and total output time of the three schemes were measured. As a result, we see that the control of intrastream synchronization is indispensable for heavy traffic and that the interleaving serves as an effective mechanism for inter-stream synchronization. Then, it is shown that the nondistinctive scheme with an appropriate size of the voice MU should be employed