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Content for  TS 36.465  Word version:  16.0.0

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1  ScopeWord‑p. 5

The present document specifies the Xw user plane protocol being used over the Xw interface for LTE/WLAN Aggregation (LWA) and LTE WLAN Radio Level Integration with IPsec Tunnel (LWIP).

2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 36.300: "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2".
[3]
TS 29.281: "General Packet Radio System (GPRS) Tunnelling Protocol User Plane (GTPv1-U)".
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3  Definitions and abbreviations

3.1  Definitions

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.
LTE-WLAN Aggregation:
Defined in TS 36.300.
LWA bearer:
Defined in TS 36.300.
LWA PDU:
in LTE-WLAN Aggregation, a PDU with DRB ID generated by LWAAP entity for transmission over WLAN.
LWIP bearer:
Defined in TS 36.300.
LWIP option:
Defined in TS 36.300.
LWIP PDU:
in LTE WLAN Radio Level Integration with IPsec Tunnel, a PDU generated by LWIPEP entity for transmission over WLAN
WLAN Termination:
Defined in TS 36.300.
Xw:
logical interface between eNB and WT.
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3.2  AbbreviationsWord‑p. 6

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.
eNB
E-UTRAN Node
LWA
LTE-WLAN Aggregation
LWIP
LTE WLAN Radio Level Integration with IPsec Tunnel
WT
WLAN Termination

4  General

4.1  General aspects

The Xw user plane (Xw UP) protocol is located in the User Plane of the Radio Network layer over the Xw interface.
In LWA option, the Xw UP protocol is used to convey control information related to the user data flow management of E-RABs. The WT flow control feedback may support indication of successful transmission towards a UE, or successful delivery to the UE, as defined in TS 36.300.
In LWIP option, the Xw UP protocol is used to convey control information related to the user data flow management of each UE. The WT flow control feedback may support indication of successful transmission towards a UE, as defined in TS 36.300.
Each Xw UP protocol instance is associated to one E-RAB only.
This version of the present document defines the Xw UP protocol in the context of LTE-WLAN Aggregation and LWIP option, more specifically, for UE user data setup for LWIP operation or for Xw user data bearers setup for E-RABs configured with the LWA bearer option.
If configured, Xw UP protocol instances exist at the eNB and the WT between which the Xw user data bearers are setup.
In this version of the present document, Xw UP protocol data is conveyed by GTP-U protocol means, more specifically, by means of the "Xw RAN Container" GTP-U extension header as defined in TS 29.281.
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