Section: 4.3.20.2.2 Attach for RN preconfiguration
Content: The RN attaches to the E-UTRAN/EPC as a UE at power-up (i.e. the RN shall not include the RN indication in the RRC Connection establishment signalling). The eNodeB treats the RN as a normal UE when performing MME selection. Because the eNodeB does not indicate that this is a RN in the S1 interface Initial UE message, the MME does not perform any further RN specific actions (e.g. it ignores any indication from the HSS that "this subscription includes a permission to operate as a RN"). The authentication of the "RN acting as an UE" is performed by the MME during this attach procedure, using the information obtained from the HSS. The MME performs the S-GW and P-GW selection as for a normal UE. NOTE: It is the responsibility of the HSS operator to ensure that the RN subscription includes an APN configuration that ensures that the RN subscription cannot be used for other purposes, e.g. only a single APN is configured for the use of RNs in phase I, and, that this APN is reserved for RNs only. The RN retrieves initial RN configuration parameters as user plane traffic, across the SGi reference point, from RN OAM (e.g. list of DeNB cells and selected PLMN). After this operation is complete, the RN detaches from the network using the normal UE initiated detach procedure, see clause 5.3.8.2.1 and the RN triggers Phase II.