Abstract
QoS provisioning is a complex and challenging issue in mobile ad hoc networks, especially when there are multiple QoS constraints. In this paper, we propose an adaptive QoS routing scheme supported by cross-layer cooperation in ad hoc networks. The cross-layer mechanism provides up-to-date local QoS information for the adaptive routing algorithm, by considering the impacts of node mobility and lower-layer link performance. The multiple QoS requirements are satisfied by adaptively using forward error correction and multipath routing mechanisms, based on the current network status. The complete routing mechanism includes three parts: (1) a modified dynamic source routing algorithm that handles route discovery and the collection of QoS-related parameters; (2) a local statistical computation and link monitoring function located in each node; and (3) an integrated decision-making system to calculate the number of routing paths, coding parity length, and traffic distribution rates. Simulation results are presented to illustrate the overall performance of our scheme. Our results indicate that our adaptive routing scheme provides suitable QoS performance that is less sensitive to network conditions (i.e., node mobility, transmission power, channel characteristics, and the traffic pattern) than a nonadaptive routing strategy.
Highlights
A wireless ad hoc network consists of a collection of mobile nodes interconnected by multihop wireless paths with wireless transmitters and receivers
For QoS support in mobile ad hoc networks, we proposed an adaptive multipath routing scheme supported by a cross-layer cooperation mechanism
The adaptive routing is completed in a distributed manner based on local QoS performance provided by cross-layer mechanism
Summary
A wireless ad hoc network consists of a collection of mobile nodes interconnected by multihop wireless paths with wireless transmitters and receivers. Some proposed QoS routing algorithms [15, 16, 17] do consider multiple metrics, but without considering cross-layer cooperation Multipath routing is another type of QoS routing that has received much attention, since it can provide load balancing, fault tolerance, and higher aggregate bandwidth [12, 18, 19]. This approach decreases packet loss and end-to-end delay, it is only efficient and reliable if a relationship can be found between the number of paths and QoS constraints. The cross-layer mechanism provides information on link performance for the QoS routing It treats traffic distribution, wireless link characteristics, and node mobility in an integrated fashion.
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