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TR 21.915  SA ★
Release 15 Description –
Summary of Rel-15 Work Items

3GPP‑Page   ETSI‑search   full‑ToC
use "3GPP‑Page" to get the Word version
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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

Here   Top
1  Scope  Word-p. 8
2  References
3  Definitions of terms, symbols and abbreviations
3.1  Terms
3.2  Symbols
3.3  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
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
5.5.2.1  Main NFs
5.5.2.2  Specificities of the 5G Core Network and associated NFs  Word-p. 16
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  The 5G Access Network  Word-p. 20
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
5.5.3.4.1  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
5.5.3.5.1  Overview
5.5.3.5.2  The Xn and X2 interfaces
5.5.3.5.3  The NG and S1 interfaces  Word-p. 24
5.5.3.5.4  The F1 interface  Word-p. 25
5.5.4  Radio Physical layer aspects
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  Other 5G aspects  Word-p. 36
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
5.6.1.3.1  Control Plane
5.6.1.3.2  User Plane
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
5.6.4.1  Data Charging in 5G System Architecture Phase 1
5.6.4.2  Other 5G System Charging aspects  Word-p. 44
6  Critical Communications  Word-p. 45
6.1  EPC support for E-UTRAN Ultra Reliable Low Latency Communication
6.2  Highly Reliable Low Latency Communication for LTE  Up
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
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
8  Vehicle-to-Everything Communications (V2X) Improvements  Word-p. 57
8.1  Enhancement of 3GPP support for V2X scenarios
8.2  Enhancements on LTE-based V2X Services
9  Improvements of Mission Critical (MC)  Word-p. 59
9.1  Enhancements to MCPTT  Up
9.2  Enhancements to MC Data  Word-p. 60
9.3  Enhancements to MC Video  Word-p. 62
9.4  Other Mission Critical Enhancements
9.4.1  MC Security Enhancements
9.4.2  MBMS usage for MC communication services  Word-p. 63
10  Features related to WLAN and unlicensed spectrum  Word-p. 64
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
11.1  Mobile Communication System for Railways
11.2  Northbound APIs related features  Word-p. 69
11.2.1  Common API Framework for 3GPP Northbound APIs
11.2.2  Northbound APIs for SCEF - SCS/AS Interworking  Word-p. 71
12  System enhancements  Word-p. 72
12.1  Control plane - user plane separation
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  Up
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
12.6.1  Architecture and interfaces
12.6.2  OTA requirements  Word-p. 84
12.7  OAM improvements  Word-p. 85
12.8  Other enhancements  Word-p. 87
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  LTE improvements  Word-p. 94
13.1  Further enhancements to Coordinated Multi-Point (CoMP) Operation for LTE  Up
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
13.8.1  Short processing time for 1 ms TTI
13.8.2  Short TTI  Word-p. 101
13.9  Enhanced LTE Support for Aerial Vehicles  Word-p. 105
13.10  Enhancing LTE CA Utilization  Word-p. 106
14  OAM improvements
14.1  Other 5G System Charging aspects
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
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
B.1  General
B.2  Direct method  Word-p. 115
B.3  Step by step method
C  Change history  Word-p. 118

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