15 Inter-layer Mobility Optimization

Jari Salo and Jussi Reunanen

  1. 15.1 Introduction
  2. 15.2 Inter-layer Idle Mode Mobility and Measurements
  3. 15.3 Inter-layer Connected Mode Measurements
  4. 15.4 Inter-layer Mobility for Coverage-Limited Network
  5. 15.5 Inter-layer Mobility for Capacity-Limited Networks
  6. 15.6 Summary
  7. References

15.1 Introduction

In most networks LTE will be deployed on multiple frequency bands and carrier frequencies. For this reason the design and optimization of mobility parameters between LTE layers and different radio access technologies (RATs) easily develops into an unmanageable tangle of cell change rules controlled by a large number of interdependent parameters. In order to easily maintain and optimize complex multi-layer networks it is therefore beneficial to have some kind of systematic – and preferably simple – approach to the management of mobility parameters. The purpose of this chapter is to summarize some potentially useful concepts and information for handling mobility in multi-layer LTE networks.

The mobility design problem can be split into two regimes: coverage and capacity-limited cases. During initial LTE network roll-out the main emphasis is on guaranteeing continuous service coverage for the subscribers. In this phase the average network utilization is low, and the mobility thresholds can be set assuming that service level is limited by radio conditions rather than network capacity.

At a later stage, when parts of the network become heavily utilized, ...

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