With the ever-increasing demand on mobile broadband services, LTE and WLAN integration, as one way of utilizing unlicensed spectrum, remains to be important for 3GPP operators.
3GPP has defined the LWA (LTE-WLAN Aggregation) and LWIP (LTE/WLAN Radio Level Integration Using IPsec Tunnel) as the key solutions for LTE and WLAN integration, see TS 36.300
The LWA and LWIP allow the UE in RRC_CONNECTED to be configured by the eNB to utilize the radio resources of WLAN.
The LWA aggregates the user data at PDCP (Packet Data Convergence Protocol) level, and delivers the LWAAP (LTE-WLAN Aggregation Adaptation Protocol) PDUs between eNB and WT (WLAN Termination). LWA supports both co-located and non-co-located deployment scenarios.
LWIP integrates the LTE and WLAN at IP level, and connects the eNB and WLAN over IP. The IP Packets (user data) transferred between the UE and LWIP-SeGW are encapsulated using IPsec to provide security to the packets that traverse WLAN. The IP packets are then transported between the LWIP-SeGW and eNB.
The present document studies the OAM aspects of LWA and LWIP.
The present document studies the following OAM aspects of LWA (for both co-located and non-co-located deployment scenarios) and LWIP, based on the solutions defined by 3GPP RAN WGs:
the WLAN related information needs to be configured to the eNB to support LWA and LWIP.
how the 3GPP management system manages the WT function for the case that the WT function is implemented in a non-3GPP NE (e.g., WLAN AC, WLAN AP).
the management model for WT for co-located and non-co-located LWA deployment scenarios.
the performance measurements to monitor the LWA and LWIP.
the FM (Fault Management) of LWA and LWIP.
The study also makes conclusions on the potential solution(s), and provides recommendations for the normative work based on the conclusions of the study.