Section: 4.7.1.6.3 Change of network mode of operation at Iu mode to A/Gb mode inter-system change
Content: Whenever an MS moves to a new RA supporting the A/Gb 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 in Iu mode, an MS that changes to GPRS operation mode A or B in A/Gb mode shall execute: Table 4.7.1.6.5/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ] : Mode A in Iu mode changing to GPRS mode A or B in A/Gb mode b) C in Iu mode, the MS shall change to GPRS operation mode C in A/Gb mode and shall execute the normal Routing Area Update procedure. c) CS in Iu mode, the MS shall execute the normal Location Update procedure. (*) 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.