Section: A.31 Monitoring of user data transmission via WLAN for LWIP
Content: For LWIP, the IP Packets transferred between the UE and LWIP-SeGW are encapsulated using IPsec in order to provide security to the packets that traverse WLAN. The end to end path between the UE and eNB via the WLAN network is referred to as the LWIP tunnel. A single IPSec tunnel is used per UE for all the data bearers that are configured to send and/ or receive data over WLAN. Each data bearer may be configured so that traffic for that bearer can be routed over the IPsec tunnel in only downlink, only uplink, or both uplink and downlink over WLAN. The operator needs to know the performance regarding user data transmission via WLAN for LWIP.