Near-Term Digital Radio (NTDR) trials at Fort Huachuca - February 1998 - 1

Near-Term Digital Radio (NTDR) trials at Fort Huachuca - February 1998 - 2

The Near-term digital radio (NTDR) program provided a prototype

mobile ad hoc network A wireless ad hoc network (WANET) or mobile ad hoc network (MANET) is a decentralized type of wireless network. The network is ad hoc because it does not rely on a pre-existing infrastructure, such as routers in wired networks or access points ...

(MANET) radio system to the United States Army, starting in the 1990s. The MANET protocols were provided by

Bolt, Beranek and Newman Raytheon BBN (originally Bolt Beranek and Newman Inc.) is an American research and development company, based next to Fresh Pond in Cambridge, Massachusetts, United States. In 1966, the Franklin Institute awarded the firm the Frank P. Brown ...

; the radio hardware was supplied by ITT. These systems have been fielded by the United Kingdom as the

High-capacity data radio High-capacity data radio (HCDR) is a development of the Near-Term Digital Radio (NTDR) for the UK government as a part of the Bowman communication system. It is a secure wideband 225–450 MHz UHF radio system that provides a self-managing ...

(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 Routing is the process of selecting a path for traffic in a network or between or across multiple networks. Broadly, routing is performed in many types of networks, including circuit-switched networks, such as the public switched telephone netw ...

. The clustering

algorithm In mathematics and computer science, an algorithm () is a finite sequence of rigorous instructions, typically used to solve a class of specific Computational problem, problems or to perform a computation. Algorithms are used as specificat ...

s 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 Open Shortest Path First (OSPF) is a routing protocol for Internet Protocol (IP) networks. It uses a link state routing (LSR) algorithm and falls into the group of interior gateway protocols (IGPs), operating within a single autonomous sys ...

(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.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.

References

* {{cite web, last1=Ruppe, first1=R, last2=Griswald, first2=S, last3=Walsh, first3=P, last4=Martin, first4=R, title=Near term digital radio (NTDR) system, url=https://www.researchgate.net/publication/3726890_Near_term_digital_radio_NTDR_system, accessdate=18 January 2018, pages=1282–1287 vol.3, doi=10.1109/MILCOM.1997.644974, date=2 December 1997 Wireless networking