By Stefano Basagni; et al
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4. TECHNICAL CHALLENGES AND RESEARCH OVERVIEW 25 based routing algorithms. Proposed greedy forwarding algorithms include The Most Forward within Radius policy (MFR) , the Nearest with Forward Progress scheme (NFP)  and the compass routing scheme ; representative directed flooding algorithms include DREAM  and LAR ; and representative hierarchical routing algorithms include the Grid Routing  and the Terminode Routing protocols . In , the authors present a detailed discussion of applications of different routing protocols in various types of networks.
For example, when a region is dense in terms of nodes, only a small number of them need to be turned on in order to forward the traffic so that the overall network lifetime is optimized. Controlling the power of the transmitting node is the other main method for achieving power saving in ad hoc networks. Reduced transmission power also allows spatial reuse of frequencies, which can help increase the total throughput of network and minimize multiuser interference . In addition, the probability of intercept and detection is lower with reduced power, which is useful in military applications.
TCP provides an effective connection-oriented transport control protocol that provides the essential flow control and congestion control required to ensure reliable packet delivery. Because error rates in wired network are quite low, TCP uses packet loss as an indication of network congestion, and deals with this effectively by making corresponding transmission adjustment to its congestion window. The mobile multihop ad hoc environment brings fresh challenges to TCP protocol due to its frequent change in network topology, disconnections, variation in link capability, and high error rate.