The importance of accurate mobility models for mobile ad hoc network (MANET) evaluation is widely recognized in literature. Existing MANET mobility models can be generally classified into two categories: entity and group mobility models. The latter is of particular interest as group motion occurs commonly in scenarios where MANETs are deployed, such as firefighting and battlefield operations. This paper provides a systematic and critical review of recent group mobility models proposed for MANETs. It also discusses the potential of using or adapting these mobility models for other emerging network types.

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In this paper, we propose a new routing protocol called hybrid opportunistic routing (HOR) which takes the advantage of broadcast nature of wireless medium and replication-based data forwarding. The data packets are transmitted by broadcast-based forwarding if the destination node is within two-hop distance from sender or by replicationbased forwarding otherwise. By exploiting overhearing opportunity, nodes can build up knowledge about data packets. The adaptive nature of data forwarding and overhearing capability provide high data delivery with minimum buffer requirement in highly dynamic MANET. Simulation results prove that 1) proposed scheme increases data delivery by above 30% compared to traditional MANET routing and 2) it can achieve 98% data delivery with 17% of the total packets for buffer space compared to replication-based routing which requires 50% of the total packets for buffer space to maintain 89% of data delivery.