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A proactive selection method for dynamic access points grouping in user-centric UDN

Network densification is a promising solution to fulfill network capacity requirement and transmission rate for beyond 5G and 6G wireless communications. Ultra-dense network (UDN) integrates heterogeneous network resources and coordinates technologies on quality of service controlling, to provide users with flexible service. However, dense deployment reduces coverage radius of the cell, resulting in an increase on handover frequency, which makes a serious impact on service continuity. In this paper, we propose a proactive selection method for dynamic access points grouping (DAPGing) in accordance with "user-centric" philosophy, which selects target Access Points (AP) and reduces handover times to ensure communication continuity. This method includes two criteria: 1) the user's sojourn time, which is determined by analyzing the AP coverage area; 2) neighbor relationship between APs, which is determined by coverage area and signal strength characteristics between neighboring APs. Therefore, candidate APs become the proactive selected ones to update the AP group. Stochastic geometry is used to build system model and performance metrics are analyzed, including AP group coverage probability and average update frequency. Experimental analysis shows that the proposed proactive selection method brings similar coverage probability to traditional handover method, while average update frequency is reduced more than 20% selection criteria.