CAC and routing for multi-service networks with blocked wide-band calls delayed, part I

exact link MDP framework

Document identifier:
Access full text here:10.1002/ett.1056
Keyword: Natural Sciences, Computer and Information Sciences, Naturvetenskap, Data- och informationsvetenskap, Call admission control and routing of delayed calls (exact MDP model)
Publication year: 2006
Relevant Sustainable Development Goals (SDGs):
SDG 9 Industry, innovation and infrastructure
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In this paper, we study the call admission control (CAC) and routing issue in multi-service networks. Two categories of calls are considered: a narrow-band (NB) with blocked calls cleared and a wide-band (WB) with blocked calls delayed. The objective function is formulated as reward maximisation with penalty for delay. The optimisation is subject to quality of service (QoS) constraints and, possibly, grade of service (GoS) constraints. A suboptimal solution is achieved by applying Markov decision process (MDP) theory together with a two-level approximation. First, the network is decomposed into a set of links assumed to have independent Markov and reward processes respectively. Second, the dimensions of the link Markov and reward processes are reduced by aggregation of the call classes into call categories. The CAC and routing policy is computed by the policy iteration algorithm from MDP theory. The numerical results show that the proposed CAC and routing method, based on the exact link MDP framework, is able to find an efficient trade-off between reward loss and average call set-up delay, outperforming conventional methods such as the least loaded routing (LLR).


Ernst Nordström

Högskolan Dalarna; Datateknik
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Zbigniew Dziong

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