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Multimedia communications

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  • Electrical and electronic engineering [2]
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Soft, vertical handover of streamed video
Author(s): G. Cunningham, P. Perry, L. Murphy
Source: Fifth IEE International Conference on 3G Mobile Communication Technologies (3G 2004) The Premier Technical Conference for 3G and Beyond, 2004, p. 432 - 436
Type: ConferencePaper
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The delay and jitter of an RTP (real time protocol) stream transported by TCP over WLAN are examined as candidates for assisting handover between networks. Jitter was found to be a good indicator of when a mobile is close to the edge of a WLAN cell and was used to spawn a vertical handover mechanism. The implemented handover scheme used an averaged delay difference to complete the handover of the video stream.

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Novel GPRS simulator for testing MAC protocols
Author(s): H. Graja, P. Perry, D. Todinca, J. Murphy
Source: Fourth International Conference on 3G Mobile Communication Technologies, 2003, p. 409 - 412
Type: ConferencePaper
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A simple, effective model of a GPRS/GSM cell is developed that can give a clear insight into the behaviour of MAC layer scheduling algorithms for a definable cohort of users. Users are defined in terms of their QoS class, their mobility characteristics and their traffic characteristics. The channel model is a C/I statistical model that has a variable mean value that is generated from a two state Markov model for each user. As an example, a weighted round robin scheduling algorithm is analysed within this simulated environment to predict its effect on traffic flow and user perceived network performance. Results presented show that the scheduling algorithm can simply and effectively implement QoS differentiation and reduce the perceived delay for real time streaming users, thereby improving the user perceived performance of the network.

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