By Stefano Basagni; et al
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4. TECHNICAL CHALLENGES AND RESEARCH OVERVIEW 27 decreases by 50% when the traffic moves from the one-hop to the two-hop path . The study in [36, 102] further shows that when the number of hops is small, the throughput decreased with increased number of hops, and was stabilized by effective pipelining only when the number of hops became large enough. Finally, different TCP implementations can result in different TCP performance; for example, conflicts between TCP data packets and TCP ACKs can cause TCP performance to degrade when window size is greater than 1 packet [104, 105].
2. Ad Hoc Routing The highly dynamic nature of mobile ad hoc networks results in frequent changes and unpredictability in network topologies, adding difficulty and complexity to routing among the mobile nodes within the network. These added challenges, coupled with the critical importance of routing protocols in establishing communications among mobile nodes, make the routing area perhaps the most active research area within the MANET domain. Especially over the last few years, numerous routing protocols and algorithms have been proposed and their performance under various network environments and traffic conditions closely studied and compared.
According to the CSMA scheme, C senses the medium and finds it busy because of B’s transmission, and, therefore, refrains from transmitting to D, although this transmission would not cause a collision at A. The exposed-terminal problem may thus result in loss of throughput. 5. Exposed-terminal problem. D 20 MOBILE AD HOC NETWORKING WITH A VIEW OF 4G WIRELESS: IMPERATIVES AND CHALLENGES The very early access protocols such as Aloha, CSMA, Bram and, TDMA introduced in the 1970s  were primarily intended as solutions to multiaccess channels, such as any broadcast media, similar to early LANs, and quickly proved inadequate to effectively deal with the needs of current-day ad hoc network applications.