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