| Summary: | 碩士 === 國立臺灣師範大學 === 資訊教育學系 === 96 === Wireless traffics tend to vary temporally and spatially. In order to support QoS guarantee in such environments, an admission control is necessary. We propose SINR-based admission control schemes for CDMA/TDM networks. The first scheme attempts to move the service of one accepted user to a neighbor cell, in order to accommodate a new service request into a full loaded cell. The user chosen for reallocation is essentially based on relative SINR values. This scheme is, however, number-based, which does not wholly exploit disparate received SINR values for reducing block probabilities. To release the “number” constraint, the second scheme attempts to use “packet delay” as an admission criterion which is designed to involve the use of the exponential rule. The performance of proposed schemes is evaluated in terms of blocking rate, effective service rate, and packet delay, all obtained by computer simulation.
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