Tactical Wireless Communications and Networks: Design Concepts and Challenges

9.2 Measurement Based Resource Management

In the absence of any information flow from the cipher text side to the plain text IP layer, one needs to consider managing the resources of the encrypted core, at the plain text IP layer, solely based on measurements. We assume that if congestion, packet loss, or packet delay occur at the encrypted core, the cipher text IP layer cannot pass any information to the plain text side due to HAIPE constraints (we will cover how encrypted core information allowed through the HAIPE can be utilized for better resource management techniques). measurement based resource management (MBRM) relies on user packets to collect statistics about the state of the encrypted core. If the plain text IP layer at node a can measure packet loss, delay, delay variation, and so on. of the packet flow coming from node b, then node a knows the status of the encrypted core path from b to a. Node a can then send a feedback token² to node b so that node b can know the status of the path from node a to node b and from node b to node a. The collected measurements can be used for protocols such as:

• Call admission control (CAC)—a technique known as measurement based admission control (MBAC).
• TCP proxy flow control—throttles back or forth a data flow from a TCP session at the plain text enclave through a TCP proxy technique as explained in this chapter.
• Voice proxy state—but VoIP should have a fixed rate flow; this chapter presents a technique to control the flow in terms ...