Method and Apparatus for Handover Management

A method performed by a second mobility management function in a second system, comprising:

• receiving a forward relocation request from a first mobility management function in a first system during a handover from the first system to the second system, wherein the forward relocation request comprises mobility management context for single radio voice call continuity (SRVCC);
• determining a SRVCC operation possible indication indicating whether both a user equipment and the second mobility management function are SRVCC-capable based at least partly on the mobility management context for SRVCC;
• and
• sending a handover request message comprising the SRVCC operation possible indication to an access network node in the second system.

An apparatus configured to implement a first mobility management function in a first system, the apparatus comprising:

• a processor;
• and
• a memory coupled to the processor, said memory containing instructions executable by said processor, whereby said processor is operative to:
• obtain mobility management context for single radio voice call continuity (SRVCC);
• and
• send a forward relocation request from the first mobility management function to a second mobility management function in a second system during a handover from the first system to the second system, wherein the forward relocation request comprises mobility management context for the SRVCC.

An apparatus configured to implement a second mobility management function in a second system, the apparatus comprising:

• a processor;
• and
• a memory coupled to the processor, said memory containing instructions executable by said processor, whereby said processor is operative to:
• receive a forward relocation request from a first mobility management function in a first system during a handover from the first system to the second system, wherein the forward relocation request comprises mobility management context for single radio voice call continuity (SRVCC);
• based at least partly on the mobility management context for SRVCC, determine a SRVCC operation possible indication indicating whether both a user equipment and the second mobility management function are SRVCC-capable;
• and
• send a handover request message comprising the SRVCC operation possible indication to an access network node in the second system.

An access network node in a second system, comprising:

• a processor;
• and
• a memory coupled to the processor, said memory containing instructions executable by said processor, whereby said access network node is operative to:
• receive a handover request message from a second mobility management function in the second system during a handover from a first system to the second system, wherein the handover request message comprises a single radio voice call continuity (SRVCC) operation possible indication indicating whether both a user equipment and the second mobility management function are SRVCC-capable;
• and
• based on the SRVCC operation possible indication, trigger SRVCC from the second system to a third system after the handover from the first system to the second system.