Analysis of Quality of Service Performances of Connection Admission Control Mechanisms in OFDMA IEEE 802.16 Network using BMAP Queuing

TL;DR

This paper analyzes QoS performance of connection admission control mechanisms in OFDMA IEEE 802.16 networks using BMAP queuing, providing analytical models and performance comparisons for threshold-based and queue-aware CAC.

Contribution

It introduces a queuing analytical framework for CAC mechanisms in OFDMA networks considering BMAP arrivals, and compares their QoS performances.

Findings

Queue-aware CAC reduces connection blocking probability.

Threshold-based CAC improves queue throughput.

Both mechanisms impact packet delay and dropping probability.

Abstract

In this paper, we consider a single-cell IEEE 802.16 environment in which the base station allocates subchannels to the subscriber stations in its coverage area. The subchannels allocated to a subscriber station are shared by multiple connections at that subscriber station. To ensure the Quality of Service (QoS) performances, two Connection Admission Control (CAC) mechanisms, namely, threshold-based and queue-aware CAC mechanisms are considered at a subscriber station. A queuing analytical framework for these admission control mechanisms is presented considering Orthogonal Frequency Division Multiple Access (OFDMA) based transmission at the physical layer. Then, based on the queuing model, both the connection-level and the packet-level performances are studied and compared with their analogues in the case without CAC. The connection arrival is modeled by a Poisson process and the packet arrival for a connection by Batch Markov Arrival Process (BMAP). We determine analytically and numerically different QoS performance measures (connection blocking probability, average number of ongoing connections, average queue length, packet dropping probability, queue throughput and average packet delay).