link Interference Management 13.4.1 PDSCH 13.4.2 Physical Downlink Control Channel Signalling Load and Number of Connected Users Dimensioning 13.5.1 Signalling Load 13.5.2 RRC-Connected Users Contents Load Balancing Capacity Bottleneck Analysis Summary References VoLTE Optimization Riku Luostari, Jari Salo, Jussi Reunanen and Harri Holma 14.1 Introduction Voice Options for LTE Smartphones Circuit Switched Fallback 14.3.1 Basic Concepts 14.3.2 CSFB Call Setup Time, Transition to Target RAT 14.3.3 CSFB Call Setup Success Rate 14.3.4 Return to LTE after CSFB Call Voice over LTE 14.4.1 Setup Success Rate and Drop Rate 14.4.2 TTI Bundling and RLC Segmentation 14.4.3 Semi-persistent Scheduling 14.4.4 Packet Bundling 14.4.5 Re-establishment with Radio Preparations 14.4.6 Voice Quality on VoLTE Single Radio Voice Call Continuity 14.5.1 Signalling Flows 14.5.2 Performance Summary References Inter-layer Mobility Optimization Jari Salo and Jussi Reunanen Introduction Inter-layer Idle Mode Mobility and Measurements 15.2.1 Initial Cell Selection and Minimum Criteria for UE to Camp on a Cell 15.2.2 Summary of Cell Reselection Rules 15.2.3 Idle Mode Measurements Inter-layer Connected Mode Measurements Inter-layer Mobility for Coverage-Limited Network 15.4.1 Basic Concepts 15.4.2 Mapping Throughput Target to SINR, RSRQ and RSRP 15.4.3 Inter-layer Mobility Example #1 (Non-equal Priority Non-equal Bandwidth LTE Layers) 15.4.4 Inter-layer Mobility Example #2 (Equal Priority Equal Bandwidth LTE Layers) Contents Inter-layer Mobility for Capacity-Limited Networks 15.5.1 Static Load Balancing via Mobility Thresholds 15.5.2 Dynamic Load Balancing via eNodeB Algorithms Summary References Smartphone Optimization Rafael Sanchez-Mejias, Laurent Noël and Harri Holma 16.1 Introduction Smartphone Traffic Analysis in LTE Networks 16.2.1 Data Volumes and Asymmetry 16.2.2 Traffic-Related Signalling 16.2.3 Mobility-Related Signalling 16.2.4 User Connectivity Smartphone Power Consumption Optimization 16.3.1 Impact of Downlink Carrier Aggregation 16