RAN slicing as enabler for low latency services
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1 RAN slicing as enabler for low latency services Presented by A. Maeder, NOKIA Bell Labs Contributions by Z. Li, P. Rost, C. Sartori, A. Prasad, C. Mannweiler ITG Fachgruppentreffen Dresden, June 10 th,
2 Outline Low latency-services Which services are we talking of? Requirements What is RAN slicing and why do we need it? Principles of RAN slicing Architecture enablers Enabling low latency services in a common infrastructure Outlook 2
3 Low-latency use cases Automotive 3 <3ms Hazard 4x more cars possible Safer and faster individual transport cooperation Industry 4.0 Computation Real-time monitoring Augmented reality Coordination 0.5ms 10ms Control Real-time remote avatar <10ms Real-time remote diagnosis 3
4 Diversity of use cases 20 Gbps peak data rates Extreme Mobile Broadband 100 Mbps avg. goodput x more devices Capacity for everyone x more traffic M2M ultra low cost 10 years on battery Smart city cameras 3D video / 4K screens Flexibility for the unknown Work in the cloud VR gaming Industry 4.0 Remote control of robot Ultra reliability <1 ms latency Massive machine type communication Sensor NW # of Devices Cost Power Mission critical broadcast Autonomous driving Critical machine type communication 4
5 Mobile Network Topology Larger European operator Diverse x-haul, network topologies, aggregation scenarios = potential site for data center /aggregation/local breakout point RRHs macro small cells tree edge cloud Local breakout and functions aggregation site Internet chain Operator services macro edge cloud CN functions small cells star macro macro ring pre-aggregation central gateways Internet Distance and latency to radio access increases 5 x small cells x macro sites x1.000 pre-aggregation sites x100 aggregation sites x10 central gateways
6 Network and RAN slicing Flexibility to support different use cases in the same physical network Enhanced Mobile Broad Band Slice Radio front end Radio front end RAN higher layers (embb) IoT Slice Low Latency Slice Gateway RAN higher layers (IoT) Gateway Internet/ domain Radio front end RAN higher layers (URLLC) Gateway UE Access Edge Aggregation Core 6
7 Isolation requirements Isolation of radio resources: in order to fulfil slice-specific service level agreements (SLAs). Function of the QoS framework and can be enforced by resource scheduling on MAC or on higher layers. Isolation of processing resources for network functions, e.g. if network functions are operating in a virtualized environment. Cryptographic isolation between slices, by providing cryptographic keys to the corresponding encryption function in RAN. 7
8 Network Management and Orchestration (NMO) Multiplexing Policy Function (across multiple MNOs) Multiplexing Policy Function (MNO specific) Slice MNO1, MBB Slice MNO2, MBB Slice MNO1, IOT Slice MNO3, IOT Slice MNO1, cmtc Slice MNO4, cmtc RAN slicing basic concept MNO specific scheduling RRC PDCP RLC MAC PHY IF* IF* IF* IF* IF* IF* MUX PHY-L MNO specific scheduling RRC PDCP RLC MAC PHY RRC MNO specific scheduling MUX PDCP RRC RRC MNO specific scheduling RLC 1 RLC 2 MAC 1 MAC 2 PHY 1 PHY 2 Air Interface PHY 3 MUX PDCP 3 RRC 3 RLC 3 MAC 3 PHY 3 Core Network Domain Radio Access Network Domain Example A: RAN Slicing down to PHY Example B: RRC Slicing and PDPC based MC Example C: No RAN Slicing, MAC based MC 8
9 Basic architecture concept in 5G CP Radio access point 1 Radio flow A RAN MC-Anchor Slice A UP traffic flow A Control signaling User device MC-Anchor Radio access point 2 Radio flow B RRC NSSF Slice B traffic flow B Control signaling Policy/Key NSSF: Network Slice Selection Function 9
10 User 1 User 1 frequency User 5 User 1 User 1 User 1 Mapping to lower layers Exploiting air interface flexibility User 2 time User 4 User 3 t f Different TTI length per tile as enabler for slices with lowlatency requirements User 2 User 3 User 5 User 4 However, trade-off with cell capacity (multi-user diversity gains) need to be considered Short TTI Long TTI 10
11 Where does delay come from? Buffering UE BS switches Router Server Air interface: - Frame alignment/tti - Resource request (UL) - RACH (UL) - HARQ On all nodes: - Processing delay - Packet buffering - Multiplexing (e.g., TDM) On all links: - Transmission delay - Duplex (e.g., TDD) 11
12 Air interface latency in 5G FDD, 0.125ms subframe length, 0.1ms processing in DL, 0.15ms in UL Downlink Target: 0.5ms in UL and DL ~ 0.45ms Uplink ~ 1.2 ms ~ 0.9 ms Source: NOKIA Networks, R ; URLLC U-Plane Latency Analysis 12
13 What to do in 5G? Air interface: - Shorter TTI/subframe (0.125 ms) - Bi-directional subframes - Shorter processing times (10x reduction) - Robust coding/no or low #HARQ retransmissions - Resource pre-allocation (e.g., semipersistent scheduling avoid resource request) - Enhanced random access (e.g. 1 or 3 step instead of 5 step) - -aware RRM - Enhanced mobility mechanisms - Device-to-device communication - Multi-connectivity schemes On all nodes: - Reduced processing delay (10x reduction) - Priority queuing very small buffers - Low number of hops to reduce instances of processing and buffering - Path switching instead of packet switching E2E architecture view - Functions close at network edge - Mobile edge computing optimized for lowlatency - Local area routing - End-to-end QoS enforcement - Resource isolation and/or dedicated infrastructure for lowlatency - Centralized resource coordination 13
14 Support for low-latency in unified architecture Scenario: support of mobile broadband and ultra low latency Internet Flow 1: Mobile Broad Band ugw MSM May be located in RAN cloud Split bearer at secondary node Low-latency, high reliablility service cloud Flow 2 V2X NG1-U NG1-U NG1-C NG1-C NG1-C NG1-U ugw 5G-NB X2* anchor X2* anchor Uu* Uu* 14
15 Summary and Outlook Network and RAN slicing are key concepts for 5G Enables flexibility for different use cases in the same network Reduces management and maintenance efforts Low latency services enabled by function optimization and deployment flexibility Configuration and optimization across all RAN functions New resource management schemes needed Flexible architecture concepts to support different use cases 15
16 People & Things Possibilities Versatile radio System of systems Practicalities Potentials Key to the programmable world 16 Nokia 2016
17 References [1] NGMN Alliance, Description of Network Slicing Concept, January 2016 [2] NOKIA Networks, R ; URLLC U-Plane Latency Analysis, 3GPP RAN1#85, May 2016 [3] 3GPP, TR V.0.3.0; Study on Scenarios and Requirements for Next Generation Access Technologies, May
18 Definitions Source: NGMN 18
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