Content area
Full Text
Abstract: The mobility of the users in a cellular mobile environment is involving the use of the radio resources. The main aspect, which characterizes this attribute, is the hard handover and this must be carried out without blocking the existing calls of the static positioned users. Combining the two sets of users, namely static positioned users and mobile users, the resulting system must be able to manage the conflict situations, resulting in a minimum blocking probability, achieved with a centralized structure, or a distributed structure. Our work is introducing a minimal distributed structure that can be used to analyze the behavior of a cellular mobile system, based on the agents technology. The structure includes two agents and each of them implements the entire operations specific to a dynamic channel allocation scheme, into a cell. The third agent is added in order to manage the eventual hard handovers requests. This three agent minimal structure can be then multiplied in order to extend to, to simulate and to analyze various real conditions.
Keywords: cellular communications, hard handover, user mobility, channel management, Dynamic Channel Allocation Scheme, cost function, MASE technology, fixed agents, blocked call probability, forced call probability.
(ProQuest: ... denotes formulae omitted.)
I. INTRODUCTION
A. CELLULAR MOBILE ENVIRONMENT - HANDOVER
The handover mechanism is specific only to cellular systems, characterized by users mobility. There are many techniques involved in this mechanism, having the goal to reduce the blocking probability for the on going calls of the users which transit the radio cells bounds. These techniques are providing the reserved channels for handover situations, and they are introduced in [1] as Prioritized Channel Assignment. Also, these techniques can be applied on Fixed Channel Allocations Schemes, as well as to Dynamic Channel Allocation Schemes. In our work we analyzed the traffic in two cells, each cell having the Dynamic Channel Allocation Scheme management for static positioned users. Each cell can provide each other a mobile traffic, randomly generated, on a carrier to interference plus noise ratio - CINR basis. An agent analyzes the mobile traffic and makes the management of the radio channel resources associated to this traffic.
B. DYNAMIC CHANNEL ALLOCATION SCHEME
Channel Allocation Schemes are techniques meant to resolve the conflicts between multiple carriers in radio...