Connection optimization for communications in multiple access environment

A system for optimizing an establishment of a communication connection between a mobile node and a correspondent node in a packet based communication network which includes a plurality of call session control function elements and a server of the mobile node constituting a communication subsystem infrastructure, the system comprising:

• means for performing an application level communication connection setup procedure between the mobile node and the correspondent node via the communication subsystem infrastructure by transmitting and receiving application level signaling messages between the correspondent node and the mobile node;
• means for producing and transmitting, during the application level communication connection setup procedure, a trigger signal from an application layer to a network layer in the mobile node wherein the trigger signal comprises the address of the correspondent node;
• and
• means for performing, in response to the trigger signal, an network level route optimization procedure during the application level communication connection setup procedure.

A network node usable in a packet based communication network which includes a plurality of call session control function elements and a server of the network node constituting a communication subsystem infrastructure, wherein an establishment of a communication connection between the network node and a correspondent node in the packet based communication network is optimized, the network node comprising:

• means for performing an application level communication connection setup procedure between the network node and the correspondent node via the communication subsystem infrastructure by transmitting and receiving application level signaling messages between the correspondent node and the network node;
• means for producing and transmitting, during the application level communication connection setup procedure, a trigger signal from an application layer to a network layer in the network node wherein the trigger signal comprises the address of the correspondent node;
• and
• means for performing, in response to the trigger signal, a network level route optimization procedure during the application level communication connection setup procedure.