Rapidly Deployable Radio Networks (RDRN)

Recent Accomplishments [Project Start Date: mid-Summer 1994]

A technique critical to the rapid deployment and reconfiguration of high-speed, link-based radio networks has recently been developed by KU. The new technique determines all possible connected network topologies for an arbitrary set of nodes, subject to constraints imposed by interference among the directed-beam radio links. This technique, which is based on the mathematical theory of consistent labeling, has been implemented for demonstration purposes with a graphical user interface (GUI) using MATLAB.

The node position location element of the RDRN has been developed and implemented, and tested. Position location is obtained using the Global Positioning System and communicated using low speed packet radios.

Date: January 31, 1995

Technical Contact: Victor S. Frost, frost@eecs.ku.edu
Webmaster: Joseph B. Evans , evans@eecs.ku.edu

RDRN Objectives

The objective of the Rapidly Deployable Radio Network (RDRN) project is to create a high speed adaptive ATM-based wireless communication system. The objective of the architecture is to use an adaptive point-to-point topology to gain the advantages of ATM for wireless networks. Key elements of this system will be implemented to prove the viability. The system will be adaptable to its environment and automatically configure itself into a high capacity, fault tolerant, and reliable configuration. No central controller or management center will be required. The architecture is composed of three overlaid networks: (1) a low bandwidth, low power omni-directional network for location determination, switch coordination and management; (2) a "cellular like" system for multiple end-user access to the switch; and (3) a high capacity, highly directional, multiple beam network for switch-to-switch communication. Each switch consists of an adaptable and programmable high capacity radio, a phased array steerable antenna, and a communication network controller with switching capabilities. As part of the approach the switch initiates three activities: (1) it determines its location via the Global Positioning System (GPS) and begins broadcasting of its location on a low capacity channel, (2) it listens for other systems broadcasting their locations, and (3) it monitors the radio frequency environment to detect other communication nodes or interfering signals. As other nearby switches are detected, the local switch establishes a high capacity point-to-point RF link to these nearby nodes. Link coordination takes place over the low capacity, omni-directional link, while the local antenna is configured to steer its beams toward nearby switches, establishing the high capacity links. Spatial reuse also will be exploited for end-user/switch communications. Should a link between two nodes be broken due to equipment failure, link degradation, or one of the nodes simply moving out of range, the network controllers detect this topology change and initiate a reconfiguration of the network topology. The reconfiguration is carried out automatically in a distributed manner. The switches used in this effort will support virtual circuits based on Broadband Integrated Services Digital Network (B-ISDN) concepts, in particular, the ATM protocols. This means that communication nodes are compatible with the evolving telecommunications infrastructure.

Other RDRN Information

RDRN Home Page

RDRN Concept Figure

TISL Home Page