3 Definitions and abbreviations

22.2783GPPService requirements for the Evolved Packet System (EPS)TS

3.1 Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 [2] and the following apply.

Communication Range: The range between UEs and /or between UEs and eNBs such that ProSe Communication is possible.

Evolved Packet System: is an evolution of the 3G UMTS characterized by higher-data-rate, lower-latency, packet-optimized system that supports multiple RATs. The Evolved Packet System comprises the Evolved Packet Core together with the evolved radio access network (E-UTRA and E-UTRAN).

Firewall: a functional entity which blocks or permits the flow of various traffic types based on a set of policy rules and definitions

EPC Path: the user plane communication path through EPC.

Open ProSe Discovery: is ProSe Discovery without explicit permission from the ProSe-enabled UE being discovered.

ProSe Broadcast Communication: a one-to-all ProSe Communication, between all authorized UEs in proximity, by means of a common ProSe Communication Path established between these UEs.

ProSe E-UTRA Communication: a ProSe Communication using a ProSe E-UTRA Communication path.

ProSe-assisted WLAN direct communication: a ProSe Communication using a ProSe-assisted WLAN direct communication path.

ProSe Communication path: the communication path supporting ProSe Communication. The communication path of a ProSe E-UTRA Communication (ProSe E-UTRA Communication path) could be established e.g. directly between the ProSe-enabled UEs using E-UTRA, or routed via local eNB(s). The communication path of a ProSe-assisted WLAN direct communication (ProSe-assisted WLAN direct communication path) is established directly between the ProSe-enabled UEs using WLAN.

ProSe Group Communication: a one-to-many ProSe Communication, between more than two UEs in proximity, by means of a common ProSe Communication path established between the UEs.

Evolved ProSe UE-to-Network Relay: is a form of relay in which a UE supports Indirect 3GPP Communication between an Evolved ProSe Remote UE and the network, using E-UTRA or WLAN between the Evolved ProSe Remote UE and the Evolved ProSe UE-to-Network Relay.

ProSe UE-to-UE Relay: is a form of relay in which a Public Safety ProSe-enabled UE acts as a ProSe E-UTRA Communication relay between two other Public Safety ProSe-enabled UEs.

Evolved ProSe Remote UE: is a UE that is connected to an Evolved ProSe UE-to-Network Relay using an Indirect 3GPP Communication.

ProSe-enabled Network: a network that supports ProSe Discovery and/or ProSe Communication.

Proximity: proximity is determined ("a UE is in proximity of another UE") when given proximity criteria are fulfilled. Proximity criteria can be different for discovery and communication.

Range Class: Rough indication of distance for use in ProSe Discovery, for example, based on geographical distance, radio conditions.

Restricted ProSe Discovery: ProSe Discovery that only takes place with explicit permission from the ProSe-enabled UE being discovered.

Service Continuity: The uninterrupted user experience of a service that is using an active communication (e.g. an ongoing voice call) when a UE undergoes a radio access technology change or a CS/PS domain change without, as far as possible, the user noticing the change.

NOTE: In particular Service Continuity encompasses the possibility that after a RAT / domain change the user experience is maintained by a different telecommunication service (e.g. tele- or bearer service) than before the RAT / domain change.

Service Reachability: Functionality to enable user access to PLMN IP-based services from outside of the PLMN’s domain via non-3GPP access technologies that have IP traffic-flow restrictions (e.g. such as firewall functions that only allow HTTP traffic).

Indirect 3GPP Communication: The signalling and communication between a UE and 3GPP network, where there is an Evolved ProSe UE-to-Network Relay between the Evolved ProSe Remote UE and the 3GPP network.

3.2 Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 [2] and the following apply.

GW Gateway

GWCN Gateway Core Network

HD High Definition

MNO Mobile Network Operator

MOCN Multi-Operator Core Network

MPS Multimedia Priority Service

ProSe Proximity Services

RCS Rich Communication Services

SHE Service Hosting Environment

SGW/PGW Serving Gateway / Packet data network Gateway