name: SRVCC
full_form: Single Radio Voice Call Continuity
context: In this phase the UTRAN reserves resources for the relocation. Then the source SGSN and source RNC are informed when the target RNC is ready. The SGSN starts bi-casting downlink N-PDUs as part of the Relocation preparation process. Figure 20: Control Plane â Preparation phase with only one SGSN Handling of abnormal conditions in the Preparation phase: If the SGSN decides to not accept the relocation from the source RNC after reception of message RELOCATION REQUIRED, the SGSN shall stop timer TRELOCalloc and send a RELOCATION PREPARATION FAILURE message to the source RNC. If the Iu signalling connection has been established or later becomes established, the SGSN shall also initiate the Iu Release procedure towards the target RNC with the cause value "Relocation Cancelled". If the target RNC can not accept the relocation of SRNS or a failure occurs during the Relocation Resource Allocation procedure in the target RNC, the target RNC shall send RELOCATION FAILURE message to the SGSN. The
description: Single Radio Voice Call Continuity (SRVCC) is a procedure that enables seamless handover of voice calls between different radio access technologies. The SRVCC Preparation procedure involves the RNC determining if an SRVCC operation is required and then initiating the procedure by sending an SRVCC CS KEYS REQUEST message to the source SGSN.
explanation: The abbreviation SRVCC is classified as a Procedure because the context describes it as a specific sequence of operations (SRVCC Preparation procedure) involving multiple network elements (RNC, SGSN), which is a characteristic of procedures in telecommunications.
section_title: 8.46.2	Successful Operation
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