Abstract—A low complexity solution to the 60 GHz link-blockage problem is proposed based on the codebook beam switching technique. The directional link is easily blocked by a moving person, which is regarded as one of the severe problems in 60 GHz communication. Codebook based beam switching is a feasible technique to resolve the link-blockage by switching the beams from the blocked path to a backup reflection path. Typically, the selection of the best reflection path is crucial. Based on beam training mechanism, an ordered beam pair list (OBPL) of reflection paths is proposed for more accurate path selection and rapid link switching. Based on the OBPL, a complete and closed-form beam switching process is developed, which can apply for blockages of both LOS path and reflection NLOS paths. The link-blockage detection and LOS link-recovery detection are investigated. Theoretical analysis and numerical results show that for IEEE 802.15.3c indoor channel model, the proposed scheme has a good performance in complexity, applicability and system throughput.