Priority scheme for multimedia communications on TCP/IP networks

Pao Yue-kong Library Electronic Theses Database

Priority scheme for multimedia communications on TCP/IP networks


Author: Cheng, Chi-kin
Title: Priority scheme for multimedia communications on TCP/IP networks
Degree: M.Sc.
Year: 1997
Subject: Video compression
TCP/IP (Computer network protocol)
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Pages: [iii], 74, [40] : ill. ; 30 cm
Language: English
InnoPac Record:
Abstract: A network transporting multimedia traffic must support connections with different delay requirements. Non-real-time traffic, such as data retrieval, requires guaranteed accurate delivery but is less sensitive to delay. On the other hand, Real-time traffic, such as video and voice, has stringent delay and loss requirements. The loss of a single video cell can cause a video stream to become de-synchronized and result in many subsequent video cells being discarded on arrival at the destination. This will cause serious degradation on video quality. In order to provide a good quality of video service, a well-defined network should be established. This project is going to enhance the Internet Protocol (IP) layer in TCP/IP in order to reduce delay jitter in sending video in the global Internet. Therefore user can obtain a good quality of video service. The delay jitter of video data transmission can be solved by priority method. In this method, video data is assigned to have the highest priority, so that it can be transmitted across several networks quickly. In addition, other issues are also taken into account, such as communication traffic condition and user preference. This thesis, a simple but efficient priority scheme is developed for video transmission over TCP/IP networks. The system is designed so as to provide: (1) low delay of video transmission and (2) a user selectable speed of video. In our proposed scheme, the number of packets in router buffer is one of the parameters in setting the priority for the incoming packets. If the router buffer is almost full, the next incoming packet will be given a lower priority. This is the same as the first come first served (FIFO) method. Besides, user preference means user can specify a desired quality of service. As a whole, our proposed priority scheme is adjusted by three parameters: (a) class of incoming packet, (b) router buffer occupancy and (c) user preference A simple algorithm is then derived for setting the priority of the incoming packets by using the three parameters. Simulations using real video data are used to evaluate the proposed priority scheme. Under a certain network condition such total bandwidth of network, an optimal set of parameters is selected. Using the optimal set of parameters, the transmission delay of video packet can be reduced by about 50% without affecting much on other types of traffic like voice and data.

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