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Content for  TS 22.278  Word version:  18.0.1

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7B Indirect 3GPP Communication  7B.1 Feature description  7B.2 General Requirements for Indirect 3GPP Communication  7C Requirements for relay UE selection for Evolved ProSe Remote UE access via an Evolved ProSe UE-to-Network Relay  7C.1 General  7C.2 Relay UE selection  8 Performance requirements for the Evolved Packet System 
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7B  Indirect 3GPP Communication |R16|  p. 31

7B.1  Feature description  p. 31

Indirect 3GPP Communication enables an Evolved ProSe Remote UE (e.g. wearable device, UE) to connect to the 3GPP network via an Evolved ProSe UE-to-Network Relay. The connection between the Evolved Prose Remote UE and the Evolved ProSe UE-to-Network Relay can use E-UTRA or WLAN.
The Evolved ProSe Remote UE has the functionality to directly connect to the EPC without an Evolved ProSe UE-to-Network Relay.The Evolved ProSe Remote UE will be visible to and controlled by the 3GPP network when connected via an Evolved ProSe UE-to-Network Relay. The Evolved ProSe Remote UE can use Indirect 3GPP Communication either in E-UTRAN coverage or out of E-UTRAN coverage.
The requirements listed in this clause (7B) exclude GSM and UMTS. Indirect 3GPP Communication to the 3GPP network shall not impact either of GSM and UMTS.
The Evolved ProSe Remote UE and the Evolved ProSe UE-to-Network Relay are served by the same PLMN.
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7B.2  General Requirements for Indirect 3GPP Communication  p. 31

The 3GPP system shall be capable of supporting Indirect 3GPP Communications between an Evolved ProSe Remote UE and the 3GPP network via an Evolved ProSe UE-to-Network Relay. This requirement applies to any Indirect 3GPP Communication between an Evolved ProSe Remote UE and Evolved ProSe UE-to-Network Relay, including ProSe Group Communication and ProSe Broadcast Communication.
There shall be a maximum of one Evolved ProSe UE-to-Network Relay between an Evolved ProSe Remote UE and E-UTRAN.
The connection between an Evolved ProSe Remote UE and an Evolved ProSe UE-to-Network Relay shall be able to use E-UTRA or WLAN.
The Evolved ProSe Remote UE supporting only E-UTRA can use Indirect 3GPP Communication either in E-UTRAN coverage or out of E-UTRAN coverage.
The Evolved ProSe Remote UE supporting E-UTRA and other RAT(s) can use Indirect 3GPP Communication either in E-UTRAN coverage or out of coverage of all supported 3GPP RAT(s) of the UE.
A UE shall be capable of acting as an Evolved ProSe UE-to-Network Relay between an Evolved ProSe Remote UE and E-UTRAN if it is authorised by the3GPP network to act as a relay and served by this E-UTRAN.
An authorised Evolved ProSe UE-to-Network Relay shall be capable of being enabled/disabled by the 3GPP network to act as a relay to/from E-UTRAN for other Evolved ProSe Remote UEs unable to access E-UTRAN.
The 3GPP network shall control the Evolved ProSe Remote UE via an Indirect 3GPP Communication using E-UTRA or WLAN. This requirement applies to any Indirect 3GPP Communication between an Evolved ProSe Remote UE and Evolved ProSe UE-to-Network Relay, including ProSe Group Communication and ProSe Broadcast Communication.
The 3GPP network shall be able to identify, authenticate, address and reach an Evolved ProSe Remote UE when it accesses the 3GPP network via an Indirect 3GPP Communication.
The 3GPP network shall manage the E-UTRA(N) resources used for the communication path between the Evolved ProSe Remote UE and the network when it accesses the 3GPP network via an Indirect 3GPP Communication.
The 3GPP network shall provide efficient use of E-UTRA radio spectrum (i.e., not increase interference or power consumption of the in-coverage UE when shared with out-of-coverage UEs).
The 3GPP network shall provide resource efficient management of shared radio spectrum for all users (e.g., Public Safety, commercial).
Based on the preference of the end-user of the Evolved ProSe UE-to-Network Relay, the 3GPP network shall be able to allow/disallow access from an Evolved ProSe Remote UE to the network via an Evolved ProSe UE-to-Network Relay.
The 3GPP system shall support the real time user traffic session (e.g. Multimedia telephony and/or real time video) for an Evolved ProSe Remote UE when the Evolved ProSe Remote UE is connected to the 3GPP network via an Indirect 3GPP Communication.
The 3GPP systems shall support small data services (e,g, CIoT, eMTC) for an Evolved ProSe Remote UE when the Evolved ProSe Remote UE uses an Indirect 3GPP Communication.
The 3GPP systems shall support data services (e,g, non-real time data) for an Evolved ProSe Remote UE when the Evolved ProSe Remote UE uses an Indirect 3GPP Communication.
The 3GPP system shall enable emergency calls via the Evolved ProSe Relay UE in case that the Evolved ProSe Remote UE supports emergency calls.
The 3GPP system shall be able to support the change for an Evolved ProSe Remote UE from a direct 3GPP communication to an Indirect 3GPP Communication and vice-versa.
The 3GPP network shall be able to ensure service continuity when the Evolved ProSe Remote UE changes from a direct 3GPP communication to an Indirect 3GPP Communication and vice-versa.
The 3GPP system shall be able to support QoS for a user traffic session even in Indirect 3GPP Communication using E-UTRA.
The support of Indirect 3GPP Communication shall not lead to a significant increase of complexity of the Evolved Prose Remote UE compared to direct communication to 3GPP network.
The use of Indirect 3GPP Communication should typically lead to a decrease in power consumption and shall not lead to an increase in power consumption at the Evolved ProSe Remote UE when compared to the Evolved ProSe Remote UE using the direct 3GPP communication for the same traffic.
An Evolved ProSe UE-to-Network Relay shall be able to relay data for a group of Evolved ProSe Remote UEs using ProSe Group Communications regardless of their group membership, if authorized by the 3GPP network.
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7C  Requirements for relay UE selection for Evolved ProSe Remote UE access via an Evolved ProSe UE-to-Network Relay |R16|  p. 32

7C.1  General  p. 32

At the time of remote UE selection of Evolved ProSe UE-to-Network Relay, there might be several Evolved ProSe UE-to-Network Relay capable UEs in proximity of the Evolved ProSe Remote UE, and available for discovery and relay connection establishment. The requirements listed in the following sub-sections relate to the selection of an appropriate Evolved ProSe UE-to-Network Relay to be used for Evolved ProSe Remote UE access to a 3GPP PLMN.
The 3GPP system shall support selection of one out of potentially several Evolved ProSe Relay capable UEs, in proximity of the Evolved ProSe Remote UE and available for discovery and relay connection establishment, through a 3GPP defined relay UE selection procedure.
The 3GPP system shall support selection of Evolved ProSe UE-to-Network Relays with subscriptions with the same owner as the subscription of the Evolved ProSe Remote UE as well as Evolved ProSe UE-to-Network Relays with subscriptions with a different owner than the subscription of the Evolved ProSe Remote UE.
The 3GPP system shall support pairing of an Evolved ProSe Remote UE and a specific Evolved ProSe UE-to-Network Relay to allow for fast remote connectivity setup with UE consent given, and/or MNO control applied, at the time of pairing.
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7C.2  Relay UE selection  p. 33

The 3GPP system shall support selection of an Evolved ProSe UE-to-Network Relay based on a combination of different criteria e.g.,
  • the subcriptions of Evolved ProSe UE-to-Network Relay and Evolved ProSe Remote UE,
  • the capabilities of the Evolved ProSe UE-to-Network Relay,
  • the QoS that is achieveable by selecting the Evolved ProSe UE-to-Network Relay,
  • the power consumption required by Evolved ProSe UE-to-Network Relay UE and Evolved ProSe Remote UE,
  • the pre-paired Evolved ProSse UE-to-Network Relay,
  • the 3GPP or non-3GPP access the Evolved ProSe UE-to-Network Relay uses to connect to the network, or
  • the 3GPP PLMN the Evolved ProSe UE-to-Network Relay connects to.
The 3GPP network shall be able to control Evolved ProSe UE-to-Network Relay selection either explicitly (e.g. by signalling) or implicitly (e.g. by provisioning of policies in the Evolved ProSe Remote UE and Evolved ProSe UE-to-Network Relay).
The 3GPP system shall support pre-configuration of Relay UE discovery information in addition to pre-configured PLMN selection information, needed for Relay UE selection, in the Evolved ProSe Remote UEs. It should include the applicable Relay UE identity to allow identification of to which Evolved ProSe Relay UE a specific set of information applies.
The 3GPP system shall support provisioning of information in the Evolved ProSe Remote UE (ME and/or USIM) used for relay UE selection.
The 3GPP system shall support having preferences stored in the Evolved ProSe Remote UE related to the relay UE selection criteria, configured/controlled by the home operator, user selectable, or a combination of both.
The 3GPP system shall support mechanisms for allowing an Evolved ProSe Remote UE to get information regarding which PLMN a specific Evolved ProSe UE-to-Network Relay connects to, prior to indirect 3GPP connection establishment.
The 3GPP system shall support mechanisms for allowing an Evolved ProSe Remote UE to get information regarding what PLMNs a specific Evolved ProSe UE-to-Network Relay connects to, in case of network sharing, prior to indirect 3GPP connection establishment.
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8  Performance requirements for the Evolved Packet System  p. 33

The Evolved Packet System comprises the Evolved Packet Core together with the evolved radio access network (E-UTRA and E-UTRAN).
The performance objectives for the Evolved Packet System include higher user data rates, reduced latency, improved system capacity and coverage, reduced network complexity and lower operating costs.
The Evolved Packet System shall meet or exceed the following performance criteria:
  1. The radio access network shall be capable of supporting instantaneous peak packet data rates of 100 Mbps on the radio access bearer downlink to the UE and 50 Mbps on the uplink.
  2. The Evolved Packet System shall be capable of providing lower user and control plane latency when compared to existing 3GPP access networks. The maximum delay should be comparable to that for fixed broadband Internet access technologies. [e.g. less than 5ms in ideal conditions]
  3. The system shall be capable of supporting large volumes of mixed e.g. voice, data and multimedia traffic. Enhanced load balancing and steering of roaming methods should be used to minimise cell congestion.
  4. The level of system complexity and mobility management signalling shall be optimised to reduce infrastructure and operating costs. UE power consumption shall also be minimised accordingly.
  5. For the Evolved Packet System the interruption time during handover of RT and NRT services shall be kept to minimum and shall not exceed the values defined in TR 25.913 [4].
  6. The Evolved Packet System shall be capable of providing low latency mobile broadband communication services with the following requirements:
    • maximum delay in the EPS of 10 ms for 98% packets,
    • 99,9999% reliability excluding the delayed packets.
  7. The Evolved Packet System shall be capable of providing low latency communication services with maximum delay in the EPS of 10 ms and 99,99% reliability.
  8. The Evolved Packet System shall be capable of providing ultra reliable low latency communication services (e.g., wireless road-side infrastructure backhaul as described in TS 22.261) with maximum delay in the EPS of 30 ms and 99,999% reliability.
  9. The Evolved Packet System shall be capable of providing ultra reliable low latency communication services with maximum delay in the EPS of 5 ms and 99,999% reliability.
  10. To support ultra reliable low latency communication services, the Evolved Packet System shall support the transmission over the radio interface of a packet of 32 bytes with a reliability of 99,999% and a user plane latency of 1ms, as described in TR 38.913.
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