The present invention relates to a method, system, client device, gateway device and computer program product for maintaining a state information in an intermediate network function (20), wherein the state information expires after a predetermined idle period. Detecting means (16; 36) are provided for detecting an idle state of a connection. In response to the detecting means, a transport protocol used for encapsulating data is changed from a first protocol with a first predetermined idle period to a second protocol with a second predetermined idle period, said second predetermined idle period being longer than said first predetermined idle period. Alternatively, a connection parameter is provided to a device (10) for a parallel second connection in a set-up negotiation via said first connection. This connection parameter is then used for setting up a parallel second connection to the device (10) based on the second transport protocol used for encapsulating data with the second predetermined idle period. Then, an information linking the first and second connections is transmitted from the device (10) to the data network, wherein the second connection is used for transmitting a wake-up notification to the device (10) in response a detected idle state. Both alternatives provide the advantage of reduced keep-alive signaling and thus enhanced battery efficiency.
展开▼
