Interference-based capacity analysis in CDMA cellular systems (original) (raw)
2003 IEEE Wireless Communications and Networking, 2003. WCNC 2003.
In multiple cellular CDMA systems, the channel capacity heavily depends upon the interference caused by the signal power of other users. In this paper, we exactly quantify the cell capacity by focusing on not only the number of users but also the location of active users. To inspect the effect of multicell CDMA environments, we model three 1/6 cells divided by 60 • sector antennas and analyze the increased interference when a user is added to the unit of cell. Based on the capacity analysis, we propose a new call admission control scheme that uses the location information of users. Whenever a new user arrives, our scheme checks whether the admittance of that user can occur within the cell capacity. If the user is far away from the base station, it will have less chance of acceptance because it creates more interference, resulting in reduced capacity. Our scheme allows more users to enter the network if they generate less interference. Therefore it has the effect of increased system capacity without sacrificing the QoS of all the other active users. Through simulations we show that the performance is improved by 10 to 20% in terms of the number of active users that can be accomodated.
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