Destination buffer analysis for packets rejection obliteration in multi-channel networks

In this paper we study a multi-channel network, each station of which is equipped with a network interface that has a receiver buffer of multiple packets. In this way, each station is able to receive multiple packets per time instant. We adopt a synchronous access protocol which is affected by the collisions over the multiple channels and the destination conflicts. The proposed protocol performance crucially depends on the size of the receiver buffer since it determines the packet rejection probability at destination. An analytical probabilistic model based on a Markovian process is adopted for the performance measures derivation by means of closed mathematical formulas. The proposed protocol is compared to relative ones that either totally ignore the receiver collisions or assume a receiver buffer of a single packet capacity. The numerical results show that the increase of the receiver buffer size improves the performance decisively, resulting in higher throughput and lower delay and rejection probability. Also, it is shown that the appropriate receiver buffer size per station in order for the rejections at destination to be effectively eliminated is not unlimited but is limited to three packets for 0.1% accepted maximum level of rejection probability. (C) 2019 The Franklin Institute. Published by Elsevier Ltd. All rights reserved

A Mobile QoS Interpretation, Definition and Maintenance Framework for 3rd Generation Mobile Systems

The Universal Mobile Telecommunication System (UMTS), viewed as the wireless access part of a backbone ATMbased broadband services fixed network (B-ISDN), serves the goal for future integrated communications. One of the major issues for the deployment of UMTS high-bandwidth and real-time multimedia applications, is the specification of acceptable Quality of Service (QoS) requirements for mobile users. In wired ATM networks, a traffic contract guarantees the connection the network should provide to a fixed user. Due to the relatively unpredictable nature of user roaming into a non-homogenous system with different wireless cell structures like UMTS, the concept of an initial traffic contract may become meaningless. This paper addresses these issues and proposes an overall framework for the interpretation, definition and adaptation of a mobile QoS for third generation ATM-based systems like UMTS. 1. Introduction A key characteristic of ATM networks is their ability to provide statistical..

Enhanced Cellular Network Performance with Adaptive Coverage based on Position Location of Mobile Terminals

Radio resource management is one of the most challenging issues in wireless systems of present and future generation. Lack of bandwidth, increased number of subscribers and high data-rate services, often cause congestion situations in wireless systems. One of the main concerns of cellular operators is to adopt intelligent mechanisms to overcome these network shortcomings. To achieve this, an efficient traffic monitoring is required. Position location of mobile terminals is one of the means to combine measurements performed by the users and their location, resulting in a monitoring system, which consists of databases with a set of network performance indicators. This information can be exploited in a way to predict traffic overload and reconfigure the system on-the-fly. In this paper we tackle the issue of resource management and we describe an adaptive coverage system that is capable to adjust radio resources in an efficient way for the network. Our main concern is to show the potential of the location-based system improvement, the adaptive coverage system architecture and the appropriate antennas that are used