The aim of this project is to make a computer program and game which simulates the call admission control policy* in a multi-service mobile network. The computer program will be demonstrated to secondary school students in Secondary Schools Science Talks to show the working principle of the mobile network.

Incoming water droplets are generated. The water droplet will move toward until it reaches the pipe switch. Water droplets will be blocked or unblocked depending on the water level in the bucket and the position of the control laser beam. If the water level is lower than the position of the control laser beam, water droplets can pass through the pipe switch and vice versa. However, the pipe switch cannot work perfectly. Water can leaks out from it. The probability of water leakage of the thin and thick water pipe switches is one sixth of the incoming water droplet flow rate. If the water droplet can pass through the pipe switch, it will continue to drop until it reaches the bucket. It will become a part of the water in the bucket if the bucket has not overflowed. The value of the water level of the bucket will increase immediately. However, if the bucket has overflowed, the water droplet will discard and cannot get into the bucket. It will bounce into the bucket which collects all discarded water droplets. Small and large water droplets will be collected in two buckets differently. The game will be terminated if the water levels of the dropping bucket of small or large water droplet meets the condition of game over which is mentioned below. As the bucket is leaky, water will leak from the bucket. Outgoing water droplets are generated by the generation method which is mentioned above. Once a water droplet is generated,  the value of the water level of the bucket will decrease immediately.

Mr. Woo successfully developed mobile network simulation experiment into userfriendly game which has been added as one of the topics of mini-lecture series for secondary school visit. Also, this experiment has been shown during the HKUST Outreach Day 2007.


* K. Y. Michael Wong, Y. Keung, C. Li and Bo Li, "Dynamic Call Admission Control with QoS Guarantee for Voice/Data Integrated Cellular Networks", Proceedings of the IEEE International Conference on Communications (ICC2004), 20-24 June 2004, Paris, Vol. 7, 4248-4252 (2004)