| 摘要 |
The application relates to session management in wireless communication networks, in particular LTE networks, where a PDN connection is disconnected locally by a user equipment UE while in LTE coverage. The standards assume that the network and the UE are always in sync. However, there may be situations, not anticipated by the standards, which may lead to the UE being out of sync with the network. For example, the UE might disconnect locally, e.g. via closure of a browser on the UE), and does not inform the network, e.g. because the UE was instructed to stop sending messages on a PDN for a predetermined time period. Therefore, when the UE request to reconnect to a PDN, the network may reject the UEs request as it still thinks that the UE is connected to the PDN. The problem is solved in that in the given situation the UE performs a tracking area update TAU procedure (812) before it requests to reconnect to the PDN (814). Another solutions foresees to start a TAU procedure whenever unexpected active radio bearer contexts exist. |
