Sleep-state for mobile terminal and service initiation for mobile terminals in sleep-state

A method performed by a communication apparatus in a second access network capable of communicating with a mobile terminal capable of communicating with a core network via a first access network or the second access network, wherein radio access technology of the first access network is different from radio access technology of the second access network, the method comprising the steps of:

• forwarding, by the communication apparatus, a paging request to the mobile terminal, wherein the paging request addressed to the mobile terminal is to be routed through the first access network but is rerouted through the second access network when the mobile terminal is attached to the second access network;
• receiving, by the communication apparatus, a message from the mobile terminal through the second access network in response to the paging request, the message requesting a service to be delivered through the first access network;
• and
• transmitting, by the communication apparatus, a handover command through the second access network to the mobile terminal, the handover command directing the mobile terminal to perform handover to the first access network and to connect to the first access network.