A Guard Code Scheme for Handover Traffic Management in WCDMA Systems |
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Authors: | Dimitrios N Skoutas Saied M Abd El-atty Angelos N Rouskas |
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Institution: | (1) Department of Information and Communication Systems Engineering, University of the Aegean, Samos, 83200, Greece |
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Abstract: | A key performance indicator of mobile wireless networks is failure probability of handover calls. In this paper, we propose
a Call Admission Control policy which prioritizes handover calls over new calls in WCDMA systems. The OVSF code occupancy
of the system is modeled by a Markov chain and the differentiation between handover and new calls is performed at the code
level by introducing a “guard code” scheme. The scheme belongs to the well-known family of guard channel schemes and reserves
some code capacity to favor the continuation of handover calls over the new calls. As the management of the general case is
intractable, we solve certain numerical instances of the problem and manage to calculate several performance metrics like
new call blocking and handover failure probabilities and code utilization. We complete our study with simulation results in
the case of higher OVSF code tree capacity.
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Keywords: | Call admission control Guard code scheme Handover OVSF |
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