Abstract
This study presents performance of call admission control and resource reservation schemes based on the mobility of the users in WCDMA cellular systems. In order to guarantee the handoff dropping probability, the mobility of the user is predicted based on a realistic mobility model. The mobility prediction scheme used in this study is used to estimate the set of candidate cells into which the mobile may move in the near future and calculates the likeliness value for each candidate cell. It also estimates the time slot at which the mobile may enter into the candidate cells based on the distance between the current location of the mobile and the candidate cell center distance. Based on the mobility prediction, resource is reserved in terms of Interference Guard margin (IGM) to guarantee some target handoff dropping probability. The admission threshold is adaptively controlled to achieve a better balance between guaranteeing handoff-dropping probability and maximizing resource utilization. Simulation results show that the call admission control scheme with mobility based resource reservation scheme outperforms well when compared with the fixed reservation scheme.
Highlights
The wide-band CDMA (W-CDMA) technology has emerged as the main air interface for 3G wireless systems, which promises to provide a transmission rate from 144Kbps to 2Mbps, enabling multimedia services as those provided by broadband wired networks
The Radio Resource Management (RRM) module in the cellular network system is responsible for efficient utilizing of air interface resources and guarantees a certain QoS level to different users according to their traffic profiles
The mobility-aware weighted sum plays an important role in the reservation estimation (RRE) process so that the effect of different mobility is taken into consideration
Summary
The wide-band CDMA (W-CDMA) technology has emerged as the main air interface for 3G wireless systems, which promises to provide a transmission rate from 144Kbps to 2Mbps, enabling multimedia services as those provided by broadband wired networks. The performance of call admission control scheme with a dynamic resource reservation scheme in terms of Interference guard margin for multimedia traffic is analysed. The set of candidate cells is estimated based on the mobility prediction and the reservation in some of the candidate cells may be redundant and will increase the call blocking rate unnecessarily.
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