In recent years, we have witnessed a huge interest in the study of channel allocation and handoff strategies for cellu lar systems to ensure continuous services that guarantee QoS to mobile users. In this paper, we have a detailed d iscussion of different categories of wireless channel allocation schemes. The basic purpose of the study is to provide a comprehensive review of d ifferent categories of channel allocation algorith ms in cellu lar systems and to recommend future direct ions of research in the area. The paper g ives a survey of published papers for discussing channel allocation schemes for cellular system. The QoS is always a major concern fo r the services offered through cellular systems and it is observed that there are always trade-offs among various parameters of the QoS of these services. There are many published papers which have taken care of d ifferent QoS parameters such as call b locking probability, call dropping probability along with other performance parameters. This paper provides details of the d ifferent categories of channel allocation schemes including static channel allocation, dynamic channel allocation and hybrid channel allocation studied in literature. A lso in this paper, we explore the different channel allocation strategies, including the scenarios in which channel allocation strategies based on centralized channel control, distributed channel control, mutual exclusion algorith ms and genetic algorith ms, are used. Also, we have summarizes trade-offs between different channel allocation schemes in terms of their co mplexity and performance. In this paper, channel allocation in different context of co mple x situations such as the ones arising in offering mu ltimed ia based services and other arising in the channel allocation for mobile base station systems and use of power management in channel allocation are exp lained. This paper also examines different handoff handling provision and prioritizat ion schemes proposed in the literature for cellu lar systems.
The growing demand of radio spectrum to facilitate the primary/secondary users in a cellular network is a challenging task. Many channel allocation models, applying cognition, have been proposed to increase the radio spectrum utilization. The proposed model peruses three types of users: primary users (PUs), opportunistic primary users (OPUs), and secondary users (SUs) that use the radio resources in collocated primary base stations. Out of these users, the opportunistic primary users and secondary users may request for handover as per their requirements. The objective of the model is to enhance the radio spectrum utilization by the opportunistic utilization of radio resources by OPUs and by enabling cognitive radio base stations to collect free channel information dynamically. The cognitive radio base station maintains the centralized free channel at collocated primary base stations to facilitate the SUs opportunistically. The proposed channel allocation technique maintains the Quality of Experience (QoE) of the users as well. The performance analysis of the model is done by simulation which diversifies the importance of the proposed model in the view of minimum blocked services.
Cellular communication has changed the dimensions of communication by offering the ease of ubiquity to the users. The bandwidth available for a cellular system is always limited. With the increase in multimedia applications and ever increasing demand of wireless devices supporting higher data rate flow, cellular systems, in general, always face scarcity of channels. In cellular systems, utilization of channels has been one of the very important areas of research along with power management, location tracking etc. Efficient and effective allocation of channels for cellular networks has become an extremely important topic of recent research. The different types of emerging services require real time support and uninterrupted communication, having more strict QoS requirements. In this paper we have explored different issues and challenges involved in channel allocations in cellular systems and also highlighted some of the channel allocation schemes proposed in the literature.
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