A measurement-based approach for multilevel admission of heterogeneous traffic in wireless ad-hoc networks

General dynamics C4S has developed a QoS solution for the Army´s warfighter information network tactical (WIN-T). This solution is also being applied to other QoS applications in tactical networks. When using an encryption device, any information exchange between the LAN where call admission control (CAC) decisions are made, and the WAN where traffic shaping is made is prevented by the encryptor. This solution was developed and tested using OPNET modeler. The core of this solution is a measurement based admission control (MBAC) type algorithm. This MBAC algorithm regulates the flow of heterogeneous traffic entering a tactical wireless ad-hoc network based on a computed end-to-end congestion level. Traffic can be of different types (voice, video and data) and have multiple levels of importance (survivability) and different real-time requirements. The algorithm prioritizes the admission of calls/sessions (at a source node) based on the QoS attributes of each class of service and the condition of the path to the destination node.