Modeling and Analysis of Dynamic Pilot Scheduling scheme for 5G Ultra-Dense Network

Recently, Ultra-Dense Network (UDN) has been evolved as one of the key enablers of future 5G wireless technologies. Thus with UDN, more users will be served simultaneously by densely deployed small cells in a confined geographical area. Such dense deployment however amplifies the problem of interference, frequent handover and frequent rescheduling of users in mobility case due to reuse of same radio resource after smaller distance. This paper describes the analysis of a dynamic pilot resource allocation scheme of UDN system where mobile users transmit periodically uplink (UL) pilot signals. Such periodic UL pilot transmission scheme enables user localization and channel estimation. The analysis considered the number of pilot resources needed to serve a given user density and how often the system has to reallocate pilot resources when interference conditions are changing for mobile users. The result on average time between consecutive reallocation of pilot resource of a mobile user gives a good insight on how timely the UDN system has to serve mobile users.