QoS issues in ad hoc wireless networks

Abstract

Ad hoc wireless networks consist of mobile nodes interconnected by multihop communication paths. Unlike conventional wireless networks, ad hoc networks have no fixed network infrastructure or administrative support. The topology of the network changes dynamically as mobile nodes join or depart the network or radio links between nodes become unusable. This article addresses some of the quality of service issues for ad hoc networks which have recently started to receive increasing attention in the literature. The focus is on QoS routing. This is a complex and difficult issue because of the dynamic nature of the network topology and generally imprecise network state information. We present the basic concepts and discuss some of the recent results. The article concludes with some observations on the open areas for further investigation.

Quality- Of- Survey Routing Solutions forMobile Ad HocNetworks: A Review

“…• Treatment of network topology (flat, hierarchical, or location-aware) • Approach to route discovery (proactive, reactive, hybrid, or predictive) On the other hand, in [6] they are classified in three different ways, based upon • The interaction between the route discovery and QoS provisioning mechanism (coupled or decoupled)• The interaction with the MAC layer (either independent or dependent) • Again, on the approach to route discovery. In general, depending upon at which layer of TCP/IP protocol suite the QoS provisioning is implemented, one can classify methods of QoS provisioning into the following categories:…”

QoS Routing in Multi-hop Wireless Networks: A New Model and Algorithm

“…In this hostile network environment the challenge of providing Quality of Service (QoS) guarantees to traffic flows has attracted attention by the research community [6] [7] and several algorithms have been proposed [8]- [14]. QoS routing algorithms proposed so far for MANETs are tailored to specific MAC (Medium Access Control) layers able to provide information on resource availability and to control resources assigned to traffic flows.…”

A Qos Based Mac Protocol for Wireless Ad-Hoc Network

“…Several CDMA-based MAC protocols for MANETs have been proposed in the literature [1,2,3,4]. These protocols, in general, are based on random channel access, whereby a terminal with a packet to transmit can proceed immediately with its transmission (starting, possibly, with an RTS/CTS exchange), irrespective of the state of the channel.…”

“…Many types of wireless services have become available, including cellular systems, satellite communication networks, and wireless local area networks (WLANs) [1,2]. The increasing popularity of WLANs and wireless devices has led to greater interest in wireless ad hoc networks.…”