scholarly journals A New QoS Management Scheme for VoIP Application over Wireless Ad Hoc Networks

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Said El brak ◽  
Mohamed El brak ◽  
Driss Benhaddou
Keyword(s):  
Ad Hoc Networks ◽  
Wireless Ad Hoc Networks ◽  
Ad Hoc ◽  
Voice Quality ◽  
Management Scheme ◽  
Integrated Environment ◽  
Hoc Networks ◽  
Application Requirements ◽  
New Applications

Nowadays, mobile ad hoc networks (MANETs) have to support new applications including VoIP (voice over IP) that impose stringent QoS (quality of service) constraints and requirements. However, VoIP applications make a very inefficient use of the MANET resources. Our work represents a first step toward improving aspects at the network layer by addressing issues from the standpoint of adaptation, claiming that effective adaptation of routing parameters can enhance VoIP quality. The most important contribution is the adaptive OLSR-VA algorithm which provides an integrated environment where VoIP activity is constantly detected and routing parameters are adapted in order to meet the application requirements. To investigate the performance advantage achieved by such algorithm, a number of realistic simulations (MANET scenarios) are performed under different conditions. The most important observation is that performance is satisfactory in terms of the perceived voice quality.

Cross-Layered Secure and QoS Aware Design of VOIP over Wireless Ad-Hoc Networks

2013 ◽  
Vol 9 (4) ◽  
pp. 23-45 ◽  
Author(s):  
Shahin Vakilinia ◽  
Mohammadhossein Alvandi ◽  
Mohammadreza Khalili Shoja ◽  
Iman Vakilinia
Keyword(s):  
Ad Hoc Networks ◽  
Wireless Ad Hoc Networks ◽  
Ad Hoc Network ◽  
Ad Hoc ◽  
Denial Of Service ◽  
Cross Layer ◽  
Wireless Ad Hoc Network ◽  
Cross Layer Design ◽  
Hoc Networks

In this paper, Cross-layer design has been used to provide quality of service (QoS) and security at the same time for VOIP over the wireless ad-hoc network. In this paper the authors extend their previous work (i.e. Multi-path Multi-Channel Protocol Design for Secure QoS-Aware VOIP in Wireless Ad-Hoc Networks) by adding transport and application layers considerations. The goal of this paper is to support QoS and security of VOIP simultaneously. Simulation results shows that the proposed cross-layered protocol stack design significantly improve QoS parameters of the VOIP calls under the jamming or Denial-of-service attacks.

scholarly journals MWAHCA: A Multimedia Wireless Ad Hoc Cluster Architecture

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Juan R. Diaz ◽  
Jaime Lloret ◽  
Jose M. Jimenez ◽  
Sandra Sendra
Keyword(s):  
Ad Hoc Networks ◽  
Wireless Ad Hoc Networks ◽  
Network Architecture ◽  
Ad Hoc ◽  
Video Data ◽  
Performance Study ◽  
Cluster Architecture ◽  
Multimedia Streams ◽  
Hoc Networks

Wireless Ad hoc networks provide a flexible and adaptable infrastructure to transport data over a great variety of environments. Recently, real-time audio and video data transmission has been increased due to the appearance of many multimedia applications. One of the major challenges is to ensure the quality of multimedia streams when they have passed through a wireless ad hoc network. It requires adapting the network architecture to the multimedia QoS requirements. In this paper we propose a new architecture to organize and manage cluster-based ad hoc networks in order to provide multimedia streams. Proposed architecture adapts the network wireless topology in order to improve the quality of audio and video transmissions. In order to achieve this goal, the architecture uses some information such as each node’s capacity and the QoS parameters (bandwidth, delay, jitter, and packet loss). The architecture splits the network into clusters which are specialized in specific multimedia traffic. The real system performance study provided at the end of the paper will demonstrate the feasibility of the proposal.

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