Section: 6.3.11 Handling of Reliable Data Service
Content: If the UE supports Reliable Data Service (see 3GPP TS 24.250[ Protocol for Reliable Data Service; Stage 3 ]  [51]), the UE may request data transfer using Reliable Data Service for a PDN connection in the Extended protocol configuration options IE during attach and UE-requested PDN connectivity procedures (see clause 5.5.1 and 6.5.1). The Reliable Data Service may only be used with PDN connections for which the "Control plane only" indicator is set or with PDN connections using the control plane CIoT EPS optimization when the MME does not move such PDN connections to the user plane. The SCEF or P-GW shall inform the UE about the acceptance of UE's request for Reliable Data Service usage during the activation of the default bearer of a PDN connection (see clause 6.4.1) in the Extended protocol configuration options IE in the ACTIVATE DEFAULT EPS BEARER CONTEXT REQUEST message. If the SCEF or P-GW accepts the use of Reliable Data Service to transfer data for the specified PDN connection, the UE shall use this PDN connection exclusively for data transfer using Reliable Data Service; otherwise the UE shall not use this PDN connection for data transfer using Reliable Data Service.