LTE Routing Area Update (RAU) Procedure
By RF Wireless Expert Team
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This document describes the Routing Area Update (RAU) procedure in an LTE system. RAU stands for Routing Area Update within the LTE network. We’ll cover both scenarios: RAU without a Serving Gateway (S-GW) change and RAU with an S-GW change.
RAU Procedure Without S-GW Change
Figure 1: RAU Procedure without S-GW change
Figure 1 illustrates the message flow between the different entities within the E-UTRAN (Evolved Universal Terrestrial Radio Access Network) during a Routing Area Update procedure where the Serving Gateway remains the same.
RAU Procedure With S-GW Change
Figure 2: RAU Procedure with S-GW change
Figure 2 depicts the message flow between E-UTRAN entities during an RAU procedure when the Serving Gateway is changed.
REFERENCE: 3GPP TS 23.401 version 11.3.0 Release 11
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