3 Definitions and abbreviations
36.4633GPPEvolved Universal Terrestrial Radio Access Network (E-UTRAN) and Wireless Local Area Network (WLAN)Release 17TSXw application protocol (XwAP)
For the purposes of the present document, the terms and definitions given in TR 21.905  and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 .
Elementary Procedure: XwAP protocol consists of Elementary Procedures (EPs). An XwAP Elementary Procedure is a unit of interaction between an eNB and WT. An EP consists of an initiating message and possibly a response message. Two kinds of EPs are used:
– Class 1: Elementary Procedures with response (success or failure),
– Class 2: Elementary Procedures without response.
eNB UE XwAP ID: Defined in TS 36.401 .
E-RAB: Defined in TS 36.401 .
LWA bearer: Defined in TS 36.300 .
LWIP-SeGW: Defined in TS 33.401 .
UE-associated signalling: Refers to XwAP messages associated to one UE, and which use the respective UE-associated logical Xw connection.
UE-associated logical Xw connection: The UE-associated logical Xw connection transports UE-associated signalling. The identities WT UE XwAP ID and eNB UE XwAP ID are used to identify the particular UE-associated logical Xw connection that a message relates to.
WLAN Termination: Defined in TS 36.300 .
WT UE XwAP ID: Defined in TS 36.401 .
For the purposes of the present document, the abbreviations given in TR 21.905  and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905 .
AC Access Category
eNB E-UTRAN NodeB
EP Elementary Procedure
EPC Evolved Packet Core
E-RAB E-UTRAN Radio Access Bearer
E-UTRAN Evolved UTRAN
IE Information Element
IKE Internet Key Exchange
LWA LTE/WLAN Aggregation
LWIP LTE/WLAN Radio Level Integration with IPsec Tunnel
LWIP-SeGW LWIP Security GateWay
PDCP Packet Data Convergence Protocol
RCLWI RAN Controlled LTE-WLAN Interworking
SN Sequence Number
TAC Tracking Area Code
UE User Equipment
WT WLAN Termination
Xw UP Xw User Plane