Abstract
Abstract Wireless mobile ad hoc networks (MANETs) have emerged as a key technology for next-generation wireless networking. Because of their advantages over other wireless networks, MANETs are undergoing rapid progress and inspiring numerous applications. However, many technical issues are still facing the deployment of this technology, and one of the most challenging aspects is the quality of service (QoS) provisioning for multimedia real-time applications. MANETs are expected to offer a diverse range of services to support real-time traffic and conventional data in an integrated fashion. Because of the diversified QoS requirements of these services, QoS models are needed for an efficient usage of network resources. One of the most crucial mechanisms for providing QoS support is admission control (AC). AC has the task of estimating the state of network's resources and thereby to decide which application data flows can be admitted without promising more resources than are available and thus violating previously made guarantees. In order to provide a better understanding of the AC research challenges in MANETs, this paper presents a detailed investigation of current state-of-the-art AC models in ad hoc networks. A brief outline of the admission function, feedback to route failures, as well as the advantages and drawbacks of each discussed model are given.
Highlights
Mobile ad hoc networks (MANETs) offer unique advantages and flexibility for certain environments and strategic applications
In order to provide a better understanding of the admission control (AC) research challenges in MANETs, this paper presents a detailed investigation of current works regarding AC models for ad hoc networks
The admission control decision in MANETs is typically based on some predefined criteria, which depends on the network traffic state and the characteristics of incoming sessions
Summary
Mobile ad hoc networks (MANETs) offer unique advantages and flexibility for certain environments and strategic applications. Not relying on complex and expensive infrastructure, which is required by their traditional counterparts, MANETs can operate in several environments where conventional networks fail [1,2] Such perceived benefits elicited urgent attention in the early days among military and rescue agencies in the use of ad hoc networks, especially under disorganized or hostile environments. The purpose of any QoS support model is to offer services with guarantees in terms of delay, bandwidth, jitter, or packet loss To provide such guarantees in dynamic ad hoc networks, the media access control (MAC) layer is responsible for bandwidth allocation at individual devices, while the network layer must consider resources along the whole path of transmission [7]. AC is a key component in multimedia systems, which needs to allow the bandwidth to be used by flows only when it is available
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