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
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 colocated
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 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 NM/EM of the eNB gets the required WLAN information for the cases that the WLAN nodes are
managed by 3GPP or non-3GPP management system
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 alarm information needs to be enhanced to support FM (Fault Management) for LWA and LWIP
The study also makes conclusions on the preferred solution(s), and provides recommendations for the normative work
based on the conclusions of the study.