Graduate Thesis Or Dissertation
 

Analysis of new protocols for computer communication networks

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/fx719q907

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  • An advanced forward 'area tactical radar network, now under conceptual development by the Air Force Electronic Systems Division, can be viewed as a novel form of computer network but with other unique problems resulting from the specialized nature of the application. The proposed network will link together a number of short-range radars, each with associated data processing equipment, so that each radar site has a complete file of tracks for all targets seen by any radar in the network. In addition, the communication network is expected to be used for transmission of a variety of other types of command and control messages. A new class of adaptive routing protocols for computer communication networks have been developed in this thesis, using the radar network as a basis, but applicable to any computer comrnunication network. These new routing protocols utilize new techniques for searching out and using both reciprocal paths (paths over which messages can travel in either direction) and non-reciprocal paths (paths over which messages can travel in only one direction) for directed message routing. The computations required by the new routing protocols are carried out in a distributed manner at each network node. The only information on network structure which a node needs to store in order to carry out any of the routing computations is the identity of its neighbors. A GPSS simulation model of a 13 node radar network was used to determine the steady state characteristics of the new routing protocols in an undamaged network, from which a performance model was developed, and to determine the transient characteristics of the new routing protocols while adapting to various cases of network damage. The transient tests indicate that each of the new routing algorithms possess varying degrees of adaptability to network damage. Some of the new routing algorithms were shown to possess the capability to adapt to extreme cases of network damage. Further transient tests indicated that when some of the new routing algorithms are combined with acknowledgement techniques, complete protocols which reliably deliver all messages to their destinations, even following severe network damage, are formed. The new protocols developed in this thesis are suitable for use in conventional computer communication networks. Overhead comparisons with an ARPA type routing protocol indicate that the new routing protocols developed in this thesis generally require less overhead for large networks with low connectivity.
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