Abstract

User Equipment (UE) paging and location tracking are influenced by the underling state handling model. There are recent proposals to introduce a new RRC state called RRC Inactive as a main state for inactive UEs in 5th Generation (5G) cellular systems. One of the characteristics of the new state is that the interface between the Radio Access Network (RAN) and Core Network (CN) is kept. Considering this characteristic, there are proposals for a RAN controlled paging and location tracking schemes for RRC Inactive UEs. In this paper, we show that this approach is not always beneficial, especially for high mobility UEs. Instead, we propose a hybrid paging and location tracking scheme where both RAN and CN are involved in the paging and location tracking of RRC Inactive UEs. This is done transparently to the UE. We further propose a hierarchical paging and location tracking scheme to reduce the signaling overhead from paging and location tracking updates. The scheme is applicable to both RAN based and CN based paging and location tracking schemes.

Highlights

  • Paging is a system access functionality that is triggered by the network to locate a User Equipment (UE)

  • In URA_PCH, the paging is done on a group of cells level called UTRAN Registration Area (URA) where the UE may move without updating its location

  • The Radio Access Network (RAN) is partitioned into small areas that consists of a group of cells that belong to a single gNB or multiple gNBs, where a gNB is a base station that provides a 5th Generation (5G) radio interface

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Summary

INTRODUCTION

Paging is a system access functionality that is triggered by the network to locate a User Equipment (UE). The identifier S-Temporary Mobile Subscriber Identity (S-TMSI) is typically used as UE identifier in the paging message Another aspect regarding paging and location area update design is the minimization of the signaling load that arises from the procedures. It proposes a hybrid scheme where either RAN initiated or CN initiated paging can be used, e.g. depending on the mobility status of the UE. The paper proposes a hierarchical paging and location tracking scheme to minimize the signaling load from paging and location tracking updates irrespective of the entity involved in the procedures.

OVERVIEW OF RRC INACTIVE STATE
RAN INITIATED PAGING
CN INITIATED PAGING
Performance comparison of RAN-initiated and CNinitiate paging schemes
Hybrid paging scheme
SIGNALLING REDUCTION THROUGH HIERARCHICAL
Findings
CONCLUSION
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