Increasing real time services in multimedia environments has initiated a new phenomenon in data communication. This paper analyzes delay in multimedia environments focusing on multi-point to point communication [1]. We separate the playtime delay in a point-to-point transmission and propose an optimization scenario for each part. It is proved that sum of the normalized path delay for point-to-point connections is invariant and based on this property, the playtime for delay-sensitive media has been minimized. We have shown that in transmission media, priority queuing is an effective solution where in the receiver side, waiting time for playtime scheduling and queuing discipline are two main factors. It is shown that there is a compromise between packet loss and packet departure time in the receiver side where the acceptable packet loss can adjust the playtime delay adaptively. Theoretical analysis for priority assignment, queuing technique and performance evaluation in different classes of queuing with different playtime scheduling are given.

Keywords: Network Delay, Playtime Scheduling, Multimedia Services

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