13Initial Access, RRC and Mobility

Mårten Ericson1, Panagiotis Spapis2, Mikko Säily3, Klaus Pedersen4, Yinan Qi5, Nicolas Barati6, Tommy Svensson7, Mehrdad Shariat8, Marco Giordani9, Marco Mezzavilla10, Mark Doll11, Honglei Miao12 and Chan Zhou2

1 Ericsson Research, Sweden

2 Huawei German Research Center, Germany

3 Nokia Bell Labs, Finland

4 Nokia Bell Labs, Denmark

5 Samsung Electronics R&D Institute, UK

6 New York University, USA

7 Chalmers University of Technology, Sweden

8 Samsung Electronics R&D Institute, UK

9 University of Padova, Italy

10 New York University, USA

11 Nokia Bell Labs, Germany

12 Intel, Germany

With contributions from Hao Guo, Nima Jamaly, Behrooz Makki, Mikael Sternad and Anna Wigren.

13.1 Introduction

This chapter covers the control plane (CP) procedures for the access of a user equipment (UE) to the network. In general, the system access is a rather complex procedure, and depending on the used mechanisms and the requirements it may be an inefficient process resulting in waste of resources. The 5th generation (5G) CP functions for the system access have the same purpose as in older generations of mobile systems, such as Wideband Code Division Multiple Access (WCDMA) and Global System for Mobile Communications (GSM). However, new requirements in 5G, for instance related to latency and energy efficiency, raise the need for different and more efficient approaches.

To easier understand the role of the CP functions, consider the events in Figure 13‐1, which depicts a UE's life ...

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