5G Forum: Current Status and Activities

Transcription

1 5G Forum: Current Status and Activities 한영남, 5G Forum 운영위원장 June 23, 2014

2 Contents Introduction Innovative Technologies Key Requirements R&D in Korea Key Wireless Network technologies Key Core Network technologies Conclusions

3 Innovative Technologies in a nutshell 1G: FDMA Frequency reuse (cellular concept) 5G Technology: R&D in Korea 2G: TDMA & CDMA Power Control Diversity 3G: WCDMA Asynchronous cell search (w/o GPS) 4G: OFDMA Cooperative Communication Massive MIMO 法古創新

4 Multiple Access 1G 2G 3G 4G 5G FDMA TDMA OFDMA FDD TDD CDMA FH/SSMA DS/SSMA WCDMA

5 Modulation/Coding 1G 2G 3G 4G 5G QPSK/DQPSK DS/SS Smart code (repetition) Smart code (repetition) OCQPSK FH/SS OCQPSK ST coding ST MIMO coding H-ARQ MIMO MU-MIMO/ Massive MIMO

6 Network topology 1G 2G 3G 4G 5G Frequency reuse (cellular) Macro cell Smart code (repetition) Micro/ Pico cell OCQPSK FFR femto cell Soft/softer HO Cooperative coding ST / Relay MIMO CoMP /eicic /F-eICIC

7 Operating Frequency How the Bands are allocated? Need-based Ex.: AMPS (20MHz + 5MHz) very awkward allocation (870~890) MHz for 2 operators A, B/824~825, 845~946.5 (A) 846.5~849(B) added: UL(DL) 825 (A) 835 (B) (A) 880 (B) 890 Some vacant spectrum slot allocation/a soln. at a time Problem Existing solutions + A solution for another problem A solution for all? Solution? Frequency refarming vs. Flexible spectrum access

8 Key Requirements Velocity: 1 Gbps/user anytime, anywhere Data rate: a few bits up to 50 Gbps(DL) Efficiency: 1000 Capacity Radio resource: Bandwidth Energy: less than 1000X Connectedness: Latency: less than 1 msec Variety: up to 600 Km/hr Services: From voice, multimedia to Hologram Mobility: Standstill to very high speed train (350 Km/hr) Applicability and reliability Always reliably connected for any application

9 5G Wireless Network Technologies (1/6) Higher Bandwidth System and 3D-Beamforming User plane latency 10ms Peak data rate >50 Gbps Beam-tracking (>50 Gbps per Cell) Peak data rate 1Gbps User plane latency 1ms Frequency band 4G frequencies (up to 100 MHz) mmwave based NRAT (1 GHz) [Adaptive Beamforming] Beam switching (>50 Gbps per Cell) [Switched Beamforming]

10 5G Wireless Network Technologies (2/6): Frequency, Quadrature Amplitude Modulation (FQAM)

11 Power 5G Wireless Network Technologies (3/6): Advanced Multiple Accesses (e.g.: NOMA) Concept: Non-Orthogonal Multiple Access MS 1 Non-Orthogonal Multiple Access BS MS 2 NOMA with Beamforming MS 3 Power allocation MS 3 MS 1 MS 2 Subcarrier Index (Frequency) N i i i m m k k m k 1 y h w x n i: user x s s scu scu wcu wcu k k k k k m: beam ID Power allocation factors: scu wcu 1 k k Signals For Zero-forcing BF, h h scu m scu m w n 0, for 1, for m m n n

12 5G Wireless Network Technologies (4/6): Moving Wireless Backhaul Mobile Hot Spot Network (MHN) mmwave for Backhaul sub 6 GHz (WLAN or femto) for Access Sub 6 GHz access link Inside vehicle Small cell mdu mgw Public Internet mgw: MHN Gateway, mdu: MHN Digital Unit, mru: MHN Radio Unit, mte: MHN Terminal Equipment

13 5G Wireless Network Technologies (5/6): Advanced Small Cell (Mobile Personal Cell: m-pc) Network Infra Domain 5G Micro/Pico Mobile Core 4G Internet Femto WiFi High Speed Mobile Backhaul Fixed PC Proximity Personal Cloud HUB Personal Cell Domain High Mobility M-PC Portable m-pc Local Breakout/ Content Caching offloading Side-haul for local direct routing Terminal Domain Direct D2D 및 Direct D2D & Indirect D2D Indirect D2D 지원 - Dynamic interference control - Cooperative communication

14 5G Wireless Network Technologies (6/6)

15 Considerations on Core Network Support both wire-line and wireless accesses Separated control plane from data plane and implemented in a virtualized manner Efficient radio resource management Fully distributed network architecture with a single level of hierarchy GW-GW interface for seamless mobility between 5G-GW s Multiple types of service of a user traffic over multiple RATs BS/GW co-located content/service cache for low latency

16 Example 5G Services M2M service AAA Location Mgmt D2D Logical GW Virtualized Control Plane Mobility Fine-grain Geo Location Policy & Charging Radio Info Resource Status & Topo. Net. Virtualization Control (e.g., SDN controller) Sensor Macro Cell Relay station Personal Cell Type1 WLAN RRH Content Cache Macro BS 5G-GW Data plane Content & Service Cache Internet Small Cell BS D2D Wire-line Terminal AP Type2 WLAN 5G-GW Data Plane D2D

17 5G Core Network Technologies (1/5) Mobile cloud network Technology Overview On-demand resource partition/ allocation/ management (Mobile as a Service) Cloud RAN virtualization/ RAN sharing and mobile core node virtualization Smart content delivery network (SDN) Radio-aware streaming delivery (e.g. DASH) Content-aware delivery Motivation Difficult to deploy new services Cloud network concept/ims depression/ 3 rd Party service High CAPEX/OPEX for operators Just bit pipe network Inefficiency in content delivery Bottleneck in mobile core for massive multimedia contents Transmission delay through core networks Follow-me cloud (e.g. LBS-based)

18 5G Core Network Technologies (2/5) Motivation Hierarchical EPC with fixed P-GW is not scalable for traffic explosion Distributed data plane for traffic explosion Virtualization technologies in distributed manner Need to convert to the distributed architecture Technology Overview Ultra Flat Architecture(UFA) with logical GW and distributed SW for traffic & signaling explosion Ultra Flat Data plane architecture Mobile Core Signaling using distributed cloud Distributed signaling with Detection & Control of signaling explosion

19 5G Core Network Technologies (3/5) Application Server Anchor Point Change Idle Session Clean-up multiple IP address IP1 IP1+IP2 IP1+IP2+IP3 Motivation No way to support the frequent seamless inter- GW handover in the distributed architecture In current architecture, change of P-GW and IP address of UE only by a re-attachment The fixed anchoring point leads the inefficient routing in core network Technology Overview Enable UE to have seamless inter-gw mobility without limitation on GW dependency Multiple GW mobility of UE Idle session detection and termination Management and control of multiple IP addresses in an interface of UE Multiple mobile tunnel management for a UE

20 5G Core Network Technologies (4/5) Difficult to interwork among heterogeneous/multi radio access Independent identifier Motivation Various access methods/authentication Multiple auth-key and security session Service continuity on edge core GW Inefficient access control and data routing path Independent radio resource management at each RAT Technology Overview Convergence of multiple accesses Optimal convergent network design Unified access control/ authentication/ securitykey distribution Optimal functional block design for multiple accesses Efficient handover to support optimal routing path on multi-rats Common radio resource management

21 5G Core Network Technologies (5/5) Motivation Support only a simple handover method between multi-rats Network-controlled HO based on radio conditions Difficult to support user preference Deficiency of optimal RAT selection algorithm Technology Overview Peer-level multi-path management Multi-APN support GW-level multi-path management Semi-static multi-radio resource/session management Multi-RAT carrier aggregation Lossless HO among multi-rat s Dynamic scheduling on multi radio resource

22 Conclusions 5G High Level Requirements, Service & technology vision 1 Gbps/user anywhere anytime in 2020s Enabling technologies of 5G core and wireless network being considered Related white papers will be available by the end of this year

23 Thank You!! 謝謝