In the tactical network scenario mobile nodes are require to attain high degree of mobility without the aid of prior network infrastructure. To access the efficient and reliable communication it must be based on tactic scenario like specified area, task specified unit etc. in real time. The performance of this system in real time is very difficult to do because of it need field test, several hundred devices as well manpower. The evaluation of algorithm and protocol simulation is another alternative to evaluate the performance of tactical network. The simulative performance evaluation relies on models used in the network. This paper basically provides survey and categorization of the mobility model on account of mobility metrics, as well as analysis of those models which meet the tactical scenario requirement tabulated in table 2.

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Free space optical (FSO) communication involves the use of optical or laser beams to send the information through the atmosphere. The key towards our vision is the use of FSO technology which in contrast to traditional wireless of RF technologies has lower interference footprint, can support longer range and offers higher bandwidth. In this paper we review the recent advances made in the field of data security for the FSO link along with certain aspects of FSO which make this technology most secure than the other existing technologies and discuss future research direction needed to bring FSO to the realm of practice.