Beam switching support to resolve link-blockage problem in 60 GHz WPANs

In this paper, we propose a solution to resolve link blockage problem in 60 GHz WPANs. Line-of-Sight (LOS) link is easily blocked by a moving person, which is concerned as one of the severe problems in 60 GHz systems. Beamforming is a feasible technique to resolve link blockage by switching the beam path from LOS link to a Non-LOS (NLOS) link. We propose and evaluate two kinds of Beam Switching (BS) mechanisms: instant decision based BS and environment learning based BS. We examine these mechanisms in a typical indoor WPAN scenario. Extensive simulations have been carried out, and our results reveal that combining angle-of-arrival with the received signal to noise ratio could make better decision for beam switching. Our work provides valuable observations for beam switching during point-to-point communication using 60 GHz radio.

[1]  Jun Horikoshi,et al.  Prediction of Millimeter-Wave Multipath Propagation Characteristics in Mobile Radio Environment , 1999 .

[2]  Peter F. M. Smulders,et al.  On the Design of Low-Cost 60-GHz Radios for Multigigabit-per-Second Transmission over Short Distances [Topics in Radio Communications] , 2007, IEEE Communications Magazine.

[3]  G. E. Zein,et al.  Influence of the human activity on wide-band characteristics of the 60 GHz indoor radio channel , 2004, IEEE Transactions on Wireless Communications.

[4]  Jens Zander,et al.  Infrastructure density and frequency reuse for user-deployed wireless LAN systems at 17 GHz in an office environment , 2001, ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240).

[5]  Upamanyu Madhow,et al.  Millimeter Wave WPAN: Cross-Layer Modeling and Multi-Hop Architecture , 2007, IEEE INFOCOM 2007 - 26th IEEE International Conference on Computer Communications.

[6]  Takeshi Manabe,et al.  Estimation of propagation-path visibility for indoor wireless LAN systems under shadowing condition by human bodies , 1998, VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151).

[7]  Maxime Flament,et al.  Virtual cellular networks for 60 GHz wireless infrastructure , 2003, IEEE International Conference on Communications, 2003. ICC '03..

[8]  Chin-Sean Sum,et al.  Beam Codebook Based Beamforming Protocol for Multi-Gbps Millimeter-Wave WPAN Systems , 2009, GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference.

[9]  Chia-Chin Chong,et al.  An Overview of Multigigabit Wireless through Millimeter Wave Technology: Potentials and Technical Challenges , 2007, EURASIP J. Wirel. Commun. Netw..