| 摘要 |
In accordance with a first aspect of the present invention, there is provided a method of signalling in a communications network comprising a user equipment, a first radio access network, a second radio access network and a core network, the core network comprising a first packet switched network control node communicatively coupled to the first radio access network, a circuit switched network control node communicatively coupled to the first radio access network, and a second packet switched network control node communicatively coupled to the second radio access network, wherein the second packet switched network control node is capable of forming an association with the circuit switched network control node, in dependence on the user equipment performing an update to the second radio access network, to enable one or more features which employ said circuit switched network control node, the method comprising: receiving a first update of the user equipment from the first radio access network towards the first packet switched network control node; subsequent to the receipt of said first update, receiving an update of the user equipment from the second radio access network towards the second packet switched network control node; sending a context-related message from the second packet switched network control node to the first packet switched network control node, the context-related message comprising association requirement context data indicating an association requirement between the second packet switched network control node and the circuit switched network control node; and receiving a further update of the user equipment from the first radio access network towards the first packet switched network control node, wherein said context-related message is sent before said further update of the user equipment from the first radio access network is received. This has an advantage that the sending of the context-related association requirement context data is independent of the further update of the user equipment towards the first packet switched network control node. The sending of the association requirement context data may thus be reliably achieved even if the receipt of the further update causes suppression of the sending of context-related messages. |
