Improving ad hoc network performance using cross-layer information

Various OSI layers and network functions must be considered together while designing efficient networks to support new multimedia services. Use of cross layer approach challenging the traditional OSI layered design has currently been in vogue. Ad hoc network has emerged as an important trend of future wireless system that provide ubiquitous wireless access. In this research, we study the performance optimization challenges of ad hoc network and cross-layer processing to improve its performance. We implemented cross layer processing between physical (PHY), medium access control (MAC) and network (NET) layers using network simulator NS-2. The MAC layer adaptively selects a transmission data rate based on the channel signal strength information from physical layer. The MAC layer utilization is sent to DSR routing protocol as a congestion aware routing metric for optimal route discovery.