Multiclass Calls Research Articles

Power-based admission control for multiclass calls in QoS-sensitive CDMA networks

In this letter, we propose a power-based call admission control (CAC) scheme to accommodate multiclass traffic by directly extending the number-based CAC scheme in multicode CDMA networks, and develop some related mathematical properties. Against the conventional findings, we demonstrate that complete partitioning (CP) of the received signal power at a basestation for each traffic class can be an approach as useful as complete sharing (CS) in accommodating an appropriate number of users. The main advantage of CP scheme over CS scheme is its simplicity in resource management

Priority-Determined Multiclass Handoff Scheme With Guaranteed Mobile QoS in Wireless Multimedia Networks

The provision of multiclass services is gaining wide acceptance and will be more ubiquitous in future wireless and mobile systems. The crucial issue is to provide the guaranteed mobile quality of service (QoS) for arriving multiclass calls. In multimedia cellular networks, we should not only minimize the dropping rate of handoff calls, but also control the blocking rate of new calls at an acceptable level. This paper proposes a novel multiclass call-admission-control mechanism that is based on a dynamic reservation pool for handoff requests. In this paper, we propose the concept of servicing multiclass connections based on priority determination through the combined analysis of mobile movement information and the desired QoS requirements of multimedia traffic. A practical framework is provided to determine the occurrence time of handoff-request reservations. In our simulation experiments, three kinds of timers are introduced for controlling the progress of discrete events. Our simulation results show that the individual QoS criteria of multiclass traffic such as the handoff call-dropping probability can be achieved within a targeted objective and the new-call-blocking probability is constrained to be below a given level. The proposed scheme is applicable to channel allocation of multiclass calls over high-speed wireless multimedia networks.

Multimedia call admission control in mobile networks: a dynamical reservation-pool approach

The effective delivery of Multimedia traffic in next generation mobile cellular communication environment will become an increasingly important issue as cell sizes shrink to accommodate continuously large demand for high capacity. To provide the guaranteed mobile QoS for arriving multi-class calls, we should not only consider the regular latency requirement, but also minimize the dropping rate of handoff calls while at the same time controlling the blocking rate of new calls. In this paper, a new multi-class call admission control mechanism is proposed that is based on dynamically forming a reservation-pool for handoff requests. The prerequisite of this scheme is that wireless components can estimate future trajectory of mobile hosts with high degree of accuracy, which is possible in today’s increasingly improved position location techniques such as GPS. In this work, we first develop the notion of servicing various multi-class connections based on priority determined using the combined analysis of mobile movement information and the desired QoS requirements of multimedia traffic. We also provide a practical framework for determining the occurrence time of handoff request reservations. For our simulation experiments, three kinds of timers are introduced for controlling the progress of discrete events. The simulation results show that the individual QoS criteria of multi-class traffic such as the handoff call dropping probability can be achieved within a targeted objective and the new call blocking probability is constrained to be below a given level. The proposed scheme is applicable to channel allocation of multi-class calls over high-speed multimedia wireless ATM networks.

Performance analysis of queueing strategies for multiple priority calls in multiservice personal communications services

Supporting multiple priority calls, we propose the queueing strategies which efficiently manage the queue to reduce the blocking probability with multiclass calls in multiservice personal communications services (MPCS). The two queueing schemes are proposed and are shown the analytic model with ( n+1) class calls. Numerical results demonstrate that the two proposed schemes show the improved performance compared to the previous scheme with two types of traffic in terms of the blocking probability. The proposed schemes are flexibly adaptable to MPCS.

Performance analysis and optimization of a cyclic-service tandem queueing system with multi-class customers

This paper analyzes a special single-server tandem queueing system with feedback, which appears in call processing for multi-class calls (tasks) in telecommunication systems. Explicit expressions are derived for joint queue-length generating functions and the mean total sojourn time spent by a call (task) in the tandem queueing system. Using the interchange argument and the extended Kleinrock's conservation law, an optimal task scheduling strategy (called as the K/ h rule) is obtained to minimize a cost function defined by the individual mean total sojourn times of multi-class tasks.