Efficient Resource Management and Mobility Support in Millimeter-Wave Cognitive Radio Networks

초록

Millimeter-wave (mmWave) communication is a key enabler of next-generation wireless networks, offering high data rates and flexible spectrum access through cognitive radio network (CRN) technologies. However, mmWave CRNs face significant mobility challenges due to directional beams, signal blockage, and dynamic primary user (PU) activity, which degrade handoff performance in high-mobility and dense scenarios. Existing handoff schemes are largely reactive and fail to jointly address mobility and spectrum dynamics while ensuring strict PU protection. In this work, we design a proactive mobility- and spectrum-aware handoff scheme for mmWave CRNs. The objective is to achieve seamless and reliable handoff management while preserving PU transmission rights. The proposed framework integrates risk-based handoff triggering, joint access-point beam and channel selection, and a make-before-break mechanism enabled by dual connectivity. This unified approach enables concurrent handling of mobility-induced and spectrum-induced handoff events within a single decision process. Simulation results demonstrate significant improvements in throughput, handoff interruption time, handoff stability, and PU collision probability compared with conventional reactive and greedy schemes, particularly under high mobility and dense deployment conditions. The proposed framework provides an effective and practical solution for mobility and spectrum management in beyond-5G and 6G mmWave CRNs.

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