The current military tactical network not only utilizes voice communications but also utilizes data communications to achieve visualization of the battle field to insure victory. Especially applications like VoIP, and VTC have become necessary applications in the commercial environments as well as in the military environments. Recently the Korea Army is undertaking a project to deploy Tactical Information Communications Networks (TICN). To resolve the increasing demand for QoS in commercial network, which is an absolute necessity in the military network, the IETF has suggested a QoS solution called IntServ and DiffServ.
In case of IntServ method the QoS guarantee of VoIP is more than sufficient, but in order to demand for QoS the user has to request bandwidth in the network and also all routers in the network must maintain and regulate all sorts of traffic in order for the scalability to work. In addition if a user request bandwidth without any restriction, other users may suffer and the efficiency of the entire network drops. So if IntServ is deployed in the military network there must be a bandwidth request policing mechanism in order to work. In conclusion the IntServ QoS method is suitable for military network in which there are only few flows and where security and policing can be maintained, such as Intranet environments.
In case of DiffServ method QoS can be guaranteed using different queues and scheduling methods such as PQ and WFQ. The DiffServ method can be implemented using only queues and schedulers in the router, which makes scalability of the network easy. But DiffServ only works if the requested QoS service of the users is less than the actual services that can be provided by the network. Also if the traffic in the network exceeds pre-defined traffic levels QoS can not be guaranteed so there must be a good traffic definitions according to the applications used in the military tactical environments. The military network is a special network where the expansions of the networks rarely exist, so in reality the restrictions of DiffServ if deployed, in the military network will be minimal.
In this paper the QoS solutions created for the commercial networking environment such as IntServ and DiffServ has been simulated in the military tactical environment. Using All-IP solution network in the military tactical environment creates a low bandwidth network due to the mobile environments with high BER. Also due to the low bandwidth, high BER environment the priorities needed in the military tactical environment can not be satisfied. The simulation results showed managed IP network solutions such as IntServ and DiffServ gave sufficient QoS guarantees needed by the military. But since IntServ and DiffServ methods both have advantages and disadvantage, military tactical networks need an managed ip network which is a hybrid of IntServ and DiffServ. DiffServ scheduler needs imbedded scheduling method which uses PQ and WFQ too.
