Distributed admission control protocol for end-to-end QoS assurance in ad hoc wireless networks
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Distributed admission control protocol for end-toend QoS assurance in ad hoc wireless networks JooSang Youn1, Sangheon Pack2 and Yong-Geun Hong3*
Abstract To reserve end-to-end bandwidth in quality of service (QoS) supported wireless ad hoc networks, local bandwidth requirement should be carefully determined by considering the number of contending nodes in an interference range. In this article, we propose a novel admission control protocol, called DACP (distributed admission control protocol), which is implemented over a reactive ad hoc routing protocol with minimal overhead. DACP computes the required bandwidth for end-to-end band-width provision at each node and estimates the available bandwidth at the medium access control layer. After that, DACP makes a decision for admitting a flow in a per-hop basis. Extensive simulations are carried out via the OPNET simulator. The simulation results demonstrate that DACP not only provides guaranteed end-to-end resource but also reduces the control overhead to provide QoS support, compared with the existing admission control schemes. Keywords: admission control, ad hoc networks, quality-of-service, resource reservation
1 Introduction Over the last few years, research on quality of service (QoS) provisioning in wireless ad hoc networks has increased significantly. These networks can be adopted in commercial environments in which there are multimedia systems that enable users to access multimedia data, such as IP television and voice over IP (VoIP). Moreover, these multimedia systems need better service quality than best-effort service. To this end, an admission control scheme including resource reservation in wireless ad hoc networks should be devised to support the end-to-end bandwidth demanded by wireless multimedia applications. The existing works on QoS in wireless ad hoc networks explore QoS routing, QoS medium access control (MAC), power management, QoS provisioning model, and so on [1-4]. However, they are not appropriate solutions for providing users with QoS because of system complexity and implementation overhead. Instead, simple admission control with low complexity can be an alternative approach.
* Correspondence: [email protected] 3 Standards Research Center, ETRI, Daejeon 305-700, Korea Full list of author information is available at the end of the article
In this article, we propose a distributed admission control protocol (DACP). DACP is implemented over an ad hoc on-demand distance vector (AODV) routing protocol and uses a route request (RREQ) packet during the route discovery procedure for admission control. DACP utilizes Hello messages to calculate the number of contending nodes within the sender’s interference range, which can significantly reduce the network overhead. In addition, DACP achieves more accurate estimation of available local bandwidth by exploiting the interaction between IEEE 802.11 MAC and AODV routing protocol. Also, in point of the complexity of the proposed algorithm for admission control, DACP only use RREQ m
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