Topology-aided and Load-aware QoS Routing (TLQR) in Wireless Ad Hoc Networks

In recent years, the convenience of wireless networks has been brought into our daily lives, and
there are many network applications like media conferencing requiring guaranteed qualities
such as bounded delay and minimum bandwidth. To ensure the quality of each communi-
cation in a wireless ad hoc network, the number of concurrent connections may not be very
large. It will be a challenge to maximizing the ad hoc network utilization while guaranteeing
the quality of service (QoS) at the same time.
In order to satisfy the required end-to-end bandwidth of each communication in wireless
ad hoc networks, we provide a distributed admission control scheme to determine whether a
wireless node is capable to relay data for others. We estimate the capability of transmission
of each wireless node when the node receives a routing message. In this way, we can establish
better routes to make communications with QoS support.
Furthermore, we try to make the spacial reuse better to maximize the utilization of a
wireless ad hoc network. There are many researches showing that if the transmission range
of each wireless node is properly assigned, the total amount of network throughput can be
improved dramatically. We dynamically adjust the transmission range of each wireless node
when the local tra±c condition changes, so that we can adopt more connections in this
network.
The experimental results show, by simply applying the admission control mechanism
on the naive °ooding routing, we can improve the total amount of end-to-end throughput
around 7{25%; and the improvement can be further achieved about 14{39% if we apply the
admission control scheme and the transmission range adjustment mechanism simultaneously.