3GPP TSG SA2 Meeting 166 - Introduction of Store and Forward feature in EPC

Sep 2, 2026

Document defines key 3GPP concepts and terminology used in the Store and Forward feature introduction for EPC. It specifies and clarifies terms including MME Pool Area, Serving GW Service Area, PDN Connection and its association to APN, and related defaults such as Default Bearer and Default APN. The text also covers special attachment modes (eCall Only Mode), emergency-attached UE, LIPA and SCEF-related PDN connections, plus correlations for local user-plane paths, and explains presence reporting areas and RAN user-plane congestion.

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Definitions and abbreviations

Definitions

3GPP TSG- DOCPROPERTY TSG/WGRef \* MERGEFORMAT SA2 Meeting # DOCPROPERTY MtgSeq \* MERGEFORMAT 166 DOCPROPERTY MtgTitle \* MERGEFORMAT DOCPROPERTY Tdoc# \* MERGEFORMAT S2-2411844 DOCPROPERTY Location \* MERGEFORMAT Orlando, DOCPROPERTY Country \* MERGEFORMAT United States, DOCPROPERTY StartDate \* MERGEFORMAT 18th Nov 2024 - DOCPROPERTY EndDate \* MERGEFORMAT 22nd Nov 2024 (was S2-2410989) FIRST CHANGE 3 Definitions and abbreviations 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]. MME Pool Area: An MME Pool Area is defined as an area within which a UE may be served without need to change the serving MME. An MME Pool Area is served by one or more MMEs ("pool of MMEs") in parallel. MME Pool Areas are a collection of complete Tracking Areas. MME Pool Areas may overlap each other. Serving GW Service Area: A Serving GW Service Area is defined as an area within which a UE may be served without need to change the Serving GW. A Serving GW Service Area is served by one or more Serving GWs in parallel. Serving GW Service Areas are a collection of complete Tracking Areas. Serving GW Service Areas may overlap each other. PDN Connection: The association between a PDN represented by an APN and a UE, represented by one IPv4 address and/or one IPv6 prefix (for IP PDN Type) or by the UE Identity (for Non-IP and Ethernet PDN Types). Default Bearer: The EPS bearer which is first established for a new PDN connection and remains established throughout the lifetime of the PDN connection. Default APN: A Default APN is defined as the APN which is marked as default in the subscription data and used during the Attach procedure and the UE requested PDN connectivity procedure when no APN is provided by the UE. eCall Only Mode: A UE configuration option that allows the UE to attach at EPS and register in IMS to perform only eCall Over IMS, and an IMS call to a non-emergency MSISDN or URI for test and/or terminal reconfiguration services. For a short period following either such call, an incoming call (e.g. callback from a PSAP or HPLMN operator) or other incoming session (e.g. for USIM reconfiguration) is possible. At other times when the UE is configured in this mode, the UE is required to refrain from any signalling to a network. Use of eCall Only Mode is configured in the USIM for the UE. PDN Connection to the SCEF: The association between a UE, represented by the UE Identity, and a PDN represented by an APN to external packet data network via SCEF to allow transfer of Non-IP data. It includes establishment and persistence of T6 connection between MME and SCEF (see TS 29.128 [79]). Emergency attached UE: A UE which only has bearer(s) related to emergency bearer service. NOTE 1: The above term is equivalent to the term "attached for emergency bearer services" as specified in TS 24.301 [46]. LIPA PDN connection: a PDN Connection for local access (e.g. for IP or Ethernet access) for a UE connected to a HeNB. en-gNB: As defined in TS 37.340 [85]. SIPTO at local network PDN connection: a PDN connection for SIPTO at local network for a UE connected to a (H)eNB. Correlation ID: For a LIPA PDN connection, Correlation ID is a parameter that enables direct user plane path between the HeNB and L-GW. SIPTO Correlation ID: For a SIPTO at local network PDN connection, SIPTO Correlation ID is a parameter that enables direct user plane path between the (H)eNB and L-GW when they are collocated. Local Home Network: A set of (H)eNBs and L-GWs in the standalone GW architecture, where the (H)eNBs have IP connectivity for SIPTO at the Local Network via all the L-GWs. Local Home Network ID: An identifier that uniquely identifies a Local Home Network within a PLMN. Presence Reporting Area: An area defined within 3GPP Packet D

FAQs

What is an MME Pool Area in this document?

An MME Pool Area is an area where a UE can be served without changing the serving MME, and it is served by one or more MMEs in parallel. It is a collection of complete Tracking Areas and may overlap with other pool areas.

What does PDN Connection mean and how is it associated with the UE?

PDN Connection is the association between a PDN represented by an APN and a UE represented by an IPv4 address and/or an IPv6 prefix for IP PDN types, or by the UE identity for non-IP and Ethernet PDN types.

What is eCall Only Mode and what signaling limitation does it impose?

eCall Only Mode is a UE configuration option that allows attachment at EPS and IMS registration to perform only eCall over IMS, plus an IMS call for non-emergency test or terminal reconfiguration services. When configured in this mode, the UE must refrain from any signaling to the network except for the allowed incoming call/session during the short period described.

Sep 2, 2026

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