on the service for the user and the qos of the tunnel for the ms in wlan next the aaa server may initiate 207 the pdp context establishment in the network nodes of the core network an exemplary context establishment procedure 207 is illustrated in fig4 the aaa server may request 401 the pdg to activate pdp contexts related to the tunnels established for a user in the 3g network for this purpose the pdg may determine 402 the pdp context parameters from the wlan tunnel settings such as the qos parameters associated thereto it should be noted that this context activation in the gsns of the 3g network may not only based on the qos parameters of the tunnel in the wlan for the user but also based on the subscription level of the individual user additional parameters for performing the pdp context activation may be included in the message see 401 from the ma server to the pdg the pdg may aggregate amongst others the imsi sgsn address apn pdp address qos requested and qos negotiated in a request message and may send 403 the request to the ggsn to create and activate a pdp context the ggsn 39 s address may for example be determined by the pdg based on the apn received from the aaa server the ggsn may create a pdp context for the 3g idle user according to the received parameters and in addition a pdp context activation is initiated 404 406 from the ggsn to the sgsn on reception of the pdp context activation message from the ggsn the sgsn establishes the contexts for.