Near-term digital radio

NTDR nodes being prepared for trials, February 1998. Initial, large-scale trials of the NTDR network, February 1998.

The Near-term digital radio (NTDR) program provided a prototype mobile ad hoc network (MANET) radio system to the United States Army, starting in the 1990s. The MANET protocols were provided by Bolt, Beranek and Newman; the radio hardware was supplied by ITT.[1] These systems have been fielded by the United Kingdom as the High-capacity data radio (HCDR) and by the Israelis as the Israeli data radio. They have also been purchased by a number of other countries for experimentation.

The NTDR protocols consist of two components: clustering and routing. The clustering algorithms dynamically organize a given network into cluster heads and cluster members. The cluster heads create a backbone; the cluster members use the services of this backbone to send and receive packets. The cluster heads use a link-state routing algorithm to maintain the integrity of their backbone and to track the locations of cluster members.

The NTDR routers also use a variant of Open Shortest Path First (OSPF) that is called Radio-OSPF (ROSPF). ROSPF does not use the OSPF hello protocol for link discovery, etc. Instead, OSPF adjacencies are created and destroyed as a function of MANET information that is distributed by the NTDR routers, both cluster heads and cluster members. It also supported multicasting.[2]

## References

1. ↑ L. Williams, L. Emory, "Near Term Digital Radio - a first look", Proceedings of the 1996 Tactical Communications Conference. Ensuring Joint Force Superiority in the Information Age, 30 April-2 May 1996.
2. ↑ B. Welsh, N. Rehn, B. Vincent, J. Weinstein, and S. Wood, "Multicasting with the near term digital radio (NTDR) in the Tactical Internet", IEEE Military Communications Conference Proceedings, MILCOM 98, 19-21 Oct. 1998.

* Ruppe, R; Griswald, S; Walsh, P; Martin, R (2 December 1997). "Near term digital radio (NTDR) system". pp. 1282–1287 vol.3. doi:10.1109/MILCOM.1997.644974. https://www.researchgate.net/publication/3726890_Near_term_digital_radio_NTDR_system. Retrieved 18 January 2018.

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