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University of California, Riverside Research Project 1 Directional Neighbor Discovery in 60 GHz Indoor Wireless Networks ABSTRACT The unlicensed 60 GHz band brings the promise of multi-gigabit data rates to support new applications such as high definition video over wireless links. Signal propagation in the 60 GHz band significantly differs from that in the traditionally used 2.4 and 5 GHz bands. The propagation and penetration losses in the 60 GHz band are much higher. Furthermore, the signals are often reflected in indoor settings. Previous physical layer studies show that the use of directional antennas can significantly help in coping with these effects. In this paper, we address the problem of neighbor discovery in the 60 GHz band. We account for not only discovery via direct line-of-sight paths, but also via refleected beams. To the best of our knowledge, none of the previous efforts on higher layer protocols for use with directional antennas account for reflections. We consider two approaches for neighbor discovery (a) direct discovery where each node explicitly discovers its neighbors and, (b) gossip-based discovery where nodes exchange information with regards to their already discovered neighbors. We develop analytical models to capture the performance of the two approaches and validate the models via simulations in indoor settings with obstacles that reflect the transmitted signals. As one might expect, the gossip based discovery incurs a lower neighbor-discovery latency than direct discovery. We examine the impact of system parameters such as varying beamwidth and node density. Our study provides insights on the right choice of system parameters for efficient neighbor discovery in the 60 GHz regime. J. Ning, T. S. Kim, S. V. Krishnamurthy and C. Cordeiro. Directional Neighbor Discovery in 60 GHz indoor wireless networks. ACM International Conference on Modeling,Analysis and Simulation of Wireless and Mobile Systems (MSWiM), Tenerife, Spain,October 2009. (a) Proposed analytical models for two neighbor discovery approaches operating in 60 GHz indoor wireless networks. (b) Performed simulations and validated the analysis. (c) Examined the impact of various system parameters on the discovery efficiency. Research Project 2 (a) Performed simulations to quantify the network performance degradation in the presence of packet replay based attacks. (b) Performed simulations to demonstrate the effect of the prevention system with UDP and TCP flows in large scale networks. OPNET Technologies, Inc. is a leading provider of solutions for managing networks and applications. OPNET's best-in-class solutions address application troubleshooting, application monitoring, network monitoring, network configuration management, capacity management, and network simulation. OPNET’s solutions have been operationally proven in thousands of customer environments worldwide, including corporate and government enterprises, government and defense agencies, network service providers, and network equipment manufacturers. For more information about OPNET and its products, visit www.opnet.com. |
