3 Definitions and abbreviations
36.4633GPPEvolved Universal Terrestrial Radio Access Network (E-UTRAN) and Wireless Local Area Network (WLAN)Release 17TSXw application protocol (XwAP)
3.1 Definitions
For the purposes of the present document, the terms and definitions given in TR 21.905 [1] 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 [1].
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 [9].
E-RAB: Defined in TS 36.401 [9].
LWA bearer: Defined in TS 36.300 [2].
LWIP-SeGW: Defined in TS 33.401 [17].
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 [2].
WT UE XwAP ID: Defined in TS 36.401 [9].
3.2 Abbreviations
For the purposes of the present document, the abbreviations given in TR 21.905 [1] 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 [1].
AC Access Category
DL Downlink
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
UL Uplink
WT WLAN Termination
Xw UP Xw User Plane