QoS for Wireless Networks

Dynamic P2P (peer-to-peer) networking is next to unique invention in
the history of Internet. The massive implementation and application of such systems
could be comprised to the growth of Internet itself. Quality-of-Service is a set of
service requirements to be met by the network.The motivation of this particular research is to review the field of Quality-of-Service
routing.

The International Journal of Computer Networks & Communications (IJCNC) is a bi monthly open access peer-reviewed journal that publishes articles which contribute new results in all areas of Computer Networks & Communications.The journal focuses on all technical and practical aspects of Computer Networks & data Communications.

In this paper, a simulation tool is presented, suitable for evaluating the performance of the 802.11e contention-based access. 802.11e is a very recent amendment to the IEEE 802.11 standard, describing the MAC layer enhancements required for Quality of Service (QoS) provision. Aim of the developed simulator is to provide an accurate and efficient tool for evaluating significant parameters of the 802.11e protocol, mainly in terms of traffic differentiation for QoS support. To evaluate the accuracy and demonstrate the use of the simulation tool, a number of simulations are performed, following the basic 802.11e interoperability test procedures.

Wireless Ad-Hoc Mesh Networks are characterized by static nodes connected in a mesh topology. A routing protocol discovers and maintains the route for successful transmission of data in a network. The routing protocol should also provide load balancing and fault tolerance for improved network performance. In Free Space Optical networks (FSO) line of sight (LOS) should be maintained between the two communicating nodes. In a multihop scenario maintaining LOS during routing is a challenge. In this paper we propose a routing protocol Quality of Service-Directional Routing Protocol (QDRP)-which assures a certain level of performance to a data flow in terms of delay and implemented on FSO MANET. Through simulations it is observed that QDRP chooses the path with the least delay and performs satisfactorily under varying node densities and transmission rates achieving end to end delay of .14 s and packet delivery percentage of 96% when simulated for an area of 1300 m *1300 m for 100 nodes. T...

Wireless Ad-Hoc Mesh Networks are characterized by static nodes connected in a mesh topology. A routing protocol discovers and maintains the route for successful transmission of data in a network. The routing protocol should also provide load balancing and fault tolerance for improved network performance. In Free Space Optical networks (FSO) line of sight (LOS) should be maintained between the two communicating nodes. In a multihop scenario maintaining LOS during routing is a challenge. In this paper we propose a routing protocol Quality of Service-Directional Routing Protocol (QDRP)-which assures a certain level of performance to a data flow in terms of delay and implemented on FSO MANET. Through simulations it is observed that QDRP chooses the path with the least delay and performs satisfactorily under varying node densities and transmission rates achieving end to end delay of .14 s and packet delivery percentage of 96% when simulated for an area of 1300 m *1300 m for 100 nodes. This work explores the potential of the proposed routing protocol for free space optical mesh networks. QDRP is compared with ORRP (Orthogonal Rendezvous Routing Protocol) and AODV (Ad-Hoc on Demand Distance Vector), a reactive protocol which is also implemented in free space optical environment. We support our conclusions that QDRP gains in terms of packet delivery percentage, end to end delay and goodput.