TR 21.915
SA
★
Release 15 Description –
Summary of Rel-15 Work Items
use "3GPP‑Page" to get the Word version
use "ETSI‑search" to get the PDF version
for a better overview, the Table of Contents (ToC) is reproduced
use "ETSI‑search" to get the PDF version
for a better overview, the Table of Contents (ToC) is reproduced
V15.0.0 (PDF)
2019/09 120 p.
Rapporteur: Mr. Sultan, Alain
The present document provides a summary of each Release 15 Feature or, whenever needed, of each significant Work Item.
The information provided in this document is limited to an overview of each Feature, explaining briefly its purpose and the main lines of the system's behaviour to execute the Feature.
More information is available by consulting the 3GPP Ultimate web site, as explained in "Annex C: Process to get further information".
full Table of Contents for TR 21.915 Word version: 15.0.0
1 Scope Word-p. 8
2 References
3 Definitions of terms, symbols and abbreviations
4 Rel-15 Executive Summary Word-p. 9
5 The 5G System (5GS) - Phase 1
5.1 Work organisation for 5GS
5.2 The 5GS service aspects
5.3 Overview of the 5GS architecture Word-p. 10
6 Critical Communications Word-p. 45
5.3.1 Introduction Word-p. 11
5.3.2 The NSA versus SA architecture
5.3.3 Overview of the Core Network Word-p. 12
5.3.4 Overview of the Access Network Word-p. 13
5.3.5 References for 5GS Stage 2
5.5 One step deeper into the 5GS Word-p. 14
5.5.1 Functional split between Radio and Core
5.5.2 The 5G Core Network Word-p. 15
5.6 Other 5G aspects Word-p. 36
5.5.2.1 Main NFs
5.5.2.2 Specificities of the 5G Core Network and associated NFs Word-p. 16
5.5.3 The 5G Access Network Word-p. 20
5.5.2.2.1 Local hosting of services and Edge Computing
5.5.2.2.2 Network slicing
5.5.2.2.3 Unified access control Word-p. 17
5.5.2.2.4 Support of 3GPP and non-3GPP access
5.5.2.2.5 Policy framework and QoS support
5.5.2.2.6 Network capability exposure Word-p. 18
5.5.2.2.7 Other specific services
5.5.2.2.8 Other 5G specificities
5.5.2.3 CN protocols
5.5.3.1 Introduction
5.5.3.2 Overview of the AN Control Plane Word-p. 21
5.5.3.3 Overview of the AN User Plane Word-p. 22
5.5.3.4 The higher layers of the AN
5.5.4 Radio Physical layer aspects
5.5.3.4.1 Layer 2 related aspects: MAC, RLC, PDCP user plane, PCP control plane, and SDAP
5.5.3.4.2 RRC related aspects Word-p. 23
5.5.3.5 The Access Network interfaces
5.5.4.1 Numerologies, waveform and frame structure
5.5.4.2 Physical Channels and Signals in NR Word-p. 26
5.5.4.3 Initial access and mobility Word-p. 27
5.5.4.4 MIMO aspects Word-p. 29
5.5.4.5 PDCCH and PDSCH Word-p. 30
5.5.4.6 PUCCH and PUSCH Word-p. 31
5.5.4.7 Scheduling/HARQ Word-p. 32
5.5.4.8 Carrier Aggregation, Bandwidth Parts, and LTE/NR dual connectivity Word-p. 33
5.5.4.9 NR-LTE co-existence
5.5.4.10 Supplementary Downlink
5.5.4.11 Supplementary Uplink
5.5.4.12 UL TPC
5.5.5 Frequency aspects Word-p. 34
5.6.1 5G AN connected to 4G AN: NSA and EDCE5
5.6.1.1 Overview
5.6.1.2 CN impacts: EPC enhancements to support 5G New Radio via Dual Connectivity (EDCE5)
5.6.1.3 AN impacts: NSA radio protocol architecture Word-p. 38
5.6.2 LTE connectivity to 5G-CN (4G AN with 5G CN) Word-p. 39
5.6.3 Security aspects of the 5G System - Phase 1 Word-p. 40
5.6.4 Charging and OAM aspects of 5G System - Phase 1 Word-p. 43
6.1 EPC support for E-UTRAN Ultra Reliable Low Latency Communication
6.2 Highly Reliable Low Latency Communication for LTE 
7 Machine-Type of Communications (MTC) and Internet of Things (IoT) Word-p. 49
7.1 Improvements of Machine-Type of Communications (MTC) and Internet of Things (IoT)
7.2 Further enhancements for Extended Coverage GSM for support of Cellular Internet of Things Word-p. 51
8 Vehicle-to-Everything Communications (V2X) Improvements Word-p. 57
9 Improvements of Mission Critical (MC) Word-p. 59
7.2.1 Introduction
7.2.2 Energy Efficient Paging Reception with EC Paging Indication channel
7.2.3 Deferred System Information Acquisition in EC operation and for PEO Word-p. 52
7.3 Even further enhanced MTC for LTE Word-p. 53
7.3.1 Support for new use cases
7.3.2 Reduced latency
7.3.3 Reduced UE power consumption Word-p. 54
7.3.4 Increased spectral efficiency
7.3.5 Improved access control Word-p. 55
7.4 Other MTC related work
74.1 AT Commands for CIoT-Ext
74.2 Battery Efficient Security for very low Throughput MTC Devices
9.1 Enhancements to MCPTT
9.2 Enhancements to MC Data Word-p. 60
9.3 Enhancements to MC Video Word-p. 62
9.4 Other Mission Critical Enhancements
10 Features related to WLAN and unlicensed spectrum Word-p. 64
9.2 Enhancements to MC Data Word-p. 60
9.3 Enhancements to MC Video Word-p. 62
9.4 Other Mission Critical Enhancements
10.1 WLAN direct discovery
10.2 Voice services over WLAN Word-p. 65
10.3 Unlicensed Spectrum Offloading System
10.4 Enhancements to LTE operation in unlicensed spectrum Word-p. 66
10.5 Other functionalities related to WLAN and unlicensed spectrum Word-p. 67
11 Other new features Word-p. 68
12 System enhancements Word-p. 72
12.1 Control plane - user plane separation
13 LTE improvements Word-p. 94
12.1.1 Separation of CP and UP for Split Option 2 of NR
12.1.2 Management Enhancement for EPC Control and User Plane Separation (CUPS) Word-p. 73
12.2 Quality of Experience (QoE) related Features Word-p. 74
12.3 Security-related improvements Word-p. 75
12.4 Virtual Reality (VR), TV, Codec and multimedia-related improvements
12.4.1 Test Methodologies for the Evaluation of Perceived Listening Quality in Immersive Audio Systems
12.4.2 Addition of HDR to TV Video Profiles Word-p. 76
12.4.3 Virtual Reality Profiles for Streaming Media
12.4.4 FEC and ROHC Activation for GCSE over MBMS Word-p. 78
12.4.5 Media Handling Aspects of 5G Conversational Services
12.5 Codec and multimedia-related improvements Word-p. 79
12.5.1 Receive acoustic output test in the presence of background noise
12.5.2 Server and Network Assisted DASH for 3GPP Multimedia Services
12.5.3 SAND for MBMS Word-p. 80
12.5.4 Framework for Live Uplink Streaming Word-p. 81
12.5.5 Further video enhancements for LTE Word-p. 82
12.5.6 Speech quality with ambient noise
12.6 Active Antenna System (AAS) Word-p. 83
12.7 OAM improvements Word-p. 85
12.8 Other enhancements Word-p. 87
12.5.2 Server and Network Assisted DASH for 3GPP Multimedia Services
12.5.3 SAND for MBMS Word-p. 80
12.5.4 Framework for Live Uplink Streaming Word-p. 81
12.5.5 Further video enhancements for LTE Word-p. 82
12.5.6 Speech quality with ambient noise
12.8.1 Simplified HS-SCCH for UMTS
12.8.2 Increased number of E-UTRAN data bearers Word-p. 89
12.8.3 Increasing the number of EPS bearers Word-p. 90
12.8.4 Enhancement of background data transfer
12.8.5 Enhanced VoLTE performance
12.8.6 DL interference mitigation for UMTS Word-p. 91
12.8.7 Enhanced Calling Name Service Word-p. 92
12.8.8 PS Data Off Phase 2 Word-p. 93
13.1 Further enhancements to Coordinated Multi-Point (CoMP) Operation for LTE
13.2 Enhancements for high capacity stationary wireless link and introduction of 1024 QAM for LTE DL Word-p. 95
13.3 UE requirements for network-based CRS interference mitigation for LTE Word-p. 96
13.4 Bluetooth®/WLAN measurement collection in LTE Minimization of Drive Tests (MDT) Word-p. 97
13.5 UL data compression in LTE Word-p. 98
13.6 UE Positioning Accuracy Enhancements for LTE
13.7 UE requirements for LTE DL 8Rx antenna ports Word-p. 99
13.8 Shortened TTI and processing time for LTE Word-p. 100
13.9 Enhanced LTE Support for Aerial Vehicles Word-p. 105
13.10 Enhancing LTE CA Utilization Word-p. 106
14 OAM improvements
13.2 Enhancements for high capacity stationary wireless link and introduction of 1024 QAM for LTE DL Word-p. 95
13.3 UE requirements for network-based CRS interference mitigation for LTE Word-p. 96
13.4 Bluetooth®/WLAN measurement collection in LTE Minimization of Drive Tests (MDT) Word-p. 97
13.5 UL data compression in LTE Word-p. 98
13.6 UE Positioning Accuracy Enhancements for LTE
13.7 UE requirements for LTE DL 8Rx antenna ports Word-p. 99
13.8 Shortened TTI and processing time for LTE Word-p. 100
13.9 Enhanced LTE Support for Aerial Vehicles Word-p. 105
13.10 Enhancing LTE CA Utilization Word-p. 106
14.1 Other 5G System Charging aspects
15 Work Items for which no summary is needed Word-p. 110
A Structure of 5GS Rel-15 3GPP work Word-p. 112
B Process to get further information Word-p. 114
C Change history Word-p. 118
14.1.1 Service Based Interface for 5G Charging
14.1.2 Charging for IMS over 5G System Architecture Phase 1 Word-p. 107
14.1.3 SMS Charging in 5G System Architecture Phase 1
14.2 Management and virtualization aspects of 5G networks and network slicing Word-p. 108
