FREQUENCY HOPPING IN STAGGERED MULTI-HOPPED MULTI-SUBNET ENVIRONMENT

Abstract

Multi-Hopping is becoming increasingly important method for routing data among nodes in wireless Ad-Hoc networks due to the fact that Ad-Hoc networks are usually setup in real time without any specific configuration. The multi-hopping techniques used in wireless AdHoc networks along with frequency hopping have several advantages in today’s world that makes it ideal for situations in which security is of utmost importance. This is in part due to the fact that frequency hopping has inherent immunity from jamming and eavesdropping which is increased in a staggered multi-hop multi-subnet environment. Due to the increasing importance of multi-hopping in wireless Ad-Hoc networks new algorithms are beginning proposed regularly on all levels of the ISO layer stack. In this MS Thesis we have developed and implemented a new technique for frequency hopping in staggered Multi-Hop Multi-Subnet environment. The method implements the synchronization of frequency hopping and time division multiple access in a staggered multihop multi-subnet environment for an Ad-Hoc network. The technique implemented in this paper works on the ISO Datalink layer (layer 2) and is used initially for synchronizing source, destination radios and two hops between them for different groups of radios in different subnets out of n radios, during this time all of the radios are communicating in different time slots on the same frequency hopping pattern. Then it moves on to synchronize the transfer of data between the groups of radios in different subnets where the radios in the different subnets communicate with their own staggered frequency hopping pattern for multiple access which further strengthens the security of such networks. In our simulations we have successfully synchronized frequency hopping in staggered multi-hopped multi-subnet environment among n radios.