Since some mobile nodes have a tightly-coupled movement behavior in mobile ad hoc networks, there are some demands for the architecture to efficiently support a multicast routing among mobile nodes with tightly-coupled group mobility. Mobile nodes tha...
Since some mobile nodes have a tightly-coupled movement behavior in mobile ad hoc networks, there are some demands for the architecture to efficiently support a multicast routing among mobile nodes with tightly-coupled group mobility. Mobile nodes that belong to the set of nodes with tightly-coupled movement behavior have the same mission in some applications. We define a logical cooperative entity as the set of nodes with the same mission and the tightly-coupled group mobility in this domain. As this definition, the tightly-coupled group mobility is actually a quite general mobility pattern in the real world, especially in military application scenarios and disaster recovery environments. Traditional ad hoc multicast protocols which consider characteristics of the loosely-coupled movement behavior cannot efficiently support those applications. Therefore, the multicast protocol that supports the tightly-coupled group mobility becomes a new challenge in mobile ad hoc networks.
Several researches have recently been proposed, such as M-LANMAR, to support group mobility in mobile ad hoc networks. This protocol supports group mobility in mobile ad hoc networks where all nodes are classified to the set of nodes with the similar mobility pattern. It is specialized multicast protocol suitable for mobile ad hoc networks only with the groups of moving nodes. So, we need a generalized multicast protocol supporting tightly-coupled group mobility in mobile ad hoc networks where groups of moving nodes and individually moving nodes coexist generally. We also need a multicast architecture that can effectively simplify problem of scalability and protocol overhead, which all multicast protocols are usually faced with, to be suitable for mobile ad hoc networks with groups of moving nodes and individually moving nodes all together.
We can regard the set of nodes with the same mobility pattern as a logical cooperative entity with the multiple interfaces by applying conventional hierarchical architecture as well as cluster concept. This technique can easily manage a multicast routing by simplifying the group mobility of groups of moving nodes. Mobile nodes composed of a logical cooperative entity play a role of the entity's interface dynamically and make a cooperative relationship all together within the entity. In this thesis, we propose a new multicast architecture and multicast routing protocols, called Logical Cooperative entity-based Multicast Architecture (LOCOMA), by utilizing previous ad hoc multicast protocols efficiently. The proposed architecture uses a logical cooperative entity concept, two-tiered hierarchical overlay multicast, and stateless multicast with a geometric location.
To demonstrate the performance of LOCOMA protocols, we perform simulation. With simulation results, we can identify that our proposed protocol outperforms existing protocols and supports the scalability and the efficient data transmission utilizing the characteristics of the group mobility.