Global Communications Conference (GLOBECOM), December 2013. Small Cell Optimization Harri Holma, Klaus Pedersen, Claudio Rosa, Anand Bedekar and Hua Wang Introduction HetNet Mobility Optimization Inter-site Carrier Aggregation with Dual Connectivity Ultra Dense Network Interference Management Power Saving with Small Cell On/Off Multivendor Macro Cell and Small Cells Summary References 8.1 Introduction This chapter presents the optimization of small cells focusing especially on the radio resource management. The optimization considers the following aspects: Mobility: improvement of the reliability of high-speed mobility in the dense small cell environment. Data rates: utilization of the macro and small cell resources simultaneously for the maxi- mization of user data rates. Interference management and capacity: minimization of interference between small cell layers in order to maximize the network capacity. Power savings: minimization of the total network power consumption. Multivendor case: operation and optimization of macro and small cell layers from different vendors. LTE Small Cell Optimization: 3GPP Evolution to Release 13, First Edition. Edited by Harri Holma, Antti Toskala and Jussi Reunanen. © 2016 John Wiley & Sons, Ltd. Published 2016 by John Wiley & Sons, Ltd. LTE Small Cell Optimization Section 8.2 presents the mobility optimization and Section 8.3 the performance of inter-site carrier aggregation where user equipment (UE) has simultaneous connection to the macro and small cells and can receive data simultaneously from both layers. Section 8.4 illustrates the optimization of the very dense small cell networks, also called ultra dense networks (UDN). The power savings are discussed in Section 8.5 and multivendor cases in Section 8.6. The chapter is summarized in Section 8.7. 8.2 HetNet Mobility Optimization The long-term evolution (LTE) mobility is network controlled and UE assisted for radio resource control (RRC) connected mode UEs, while RRC Idle mode behaviour relies on UE autonomous cell selection