Section: 4.7.1.6.4 Change of network mode of operation at A/Gb mode to Iu mode inter-system change
Content: Whenever an MS moves to a new RA supporting the Iu mode radio interface, the procedures executed by the MS depend on the network mode of operation in the old and new routing area. In case the MS is in state GMM-REGISTERED or GMM-ROUTING-AREA-UPDATING-INITIATED and is in operation mode: a) A or B in A/Gb mode, the MS shall change to operation mode A in Iu mode and shall execute: Table 4.7.1.6.8/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ] : Mode A or B in A/Gb mode changing to mode A in Iu mode b) C in A/Gb mode, an MS that changes to operation mode C in Iu mode shall execute a Normal Routing Area Update. (*) Intended to remove the Gs association in the MSC/VLR. (**) Intended to establish the Gs association in the MSC/VLR. (***) If the MS that needs only GPRS services and "SMS-only service" moves to a new routing area, see subclause 4.1.1.2.2. Further details are implementation issues.