Advanced Concepts 5G

Transcription

1 Advanced Concepts 5G Background Applications & Requirements Radio Technology Candidates Networking Trends Status and Timeline Parts of the presentation are taken from material that has been provided by M. Meyer (Ericsson Research, Germany) and M. Lott (DoCoMo Euro-Labs, Germany)

2 5G Background Currently, there is a dramatic change of the mobile communication landscape Data hungry applications requiring further increase of bandwidth Emergency of M2M with huge number of connected devices New applications with extreme low latency requirements Although 4G can fulfill many of these requirements there are significant limitations lying in the applied methods and system structure Access scheme and resource management provide limits in network capacity, which are hard to overcome Frame structure and network topology cause latency limit > 20ms Transmission techniques are further advancing Increase in signal processing capabilities allow new approaches, which were impossible in past communication systems Availability of modern components (amplifier, mixers, etc.) allow cost efficient use also on higher frequency bands, esp. > 10 GHz In consequence, many research activities have been started in Europe, North America and Asia on next generation mobile communication systems So far (2015), the meaning of 5G not fully defined Target: 5G mobile communication systems emerge around

3 5G Use Cases and Examples Source: NGNM 5G White paper, NGNM Alliance, Feb

4 Key Capabilities Source: Recommendation ITU-R M , ITU, Sep Enhancement of key capabilities from IMT-Advanced to IMT-2020 Key capabilities in different usage scenarios 4

5 5G Requirements and Performance Targets High System Capacity 1000 x improvement [MBps/km 2 ] High Data Rates x increase even in high mobility Reduced Latency Latency < 1ms end-to-end Massive Device Connectivity 100 x improvement even in crowded areas Energy Saving & Cost Reduction Network & Terminals incl. backhaul 5

6 Directions of Evolution The 5G Cube Network Density [sites/km 2 ] Network densification Higher frequencies Advanced beamforming curr. cap. 5G Spectrum Efficiency [MBps/MHz/site] Massive MIMO Flexible Multi-Access/ Duplexing Reduction of control overhead Available Spectrum [MHz] Spectrum extension Licensed/ unlicensed access Traffic Capacity [MBps/km 2 ] 6

7 New Spectrum for 5G From sub-ghz to mm-wave Lower frequencies for full-area coverage Complementary use of higher frequencies Extreme traffic capacity and data rates in dense scenarios 7

8 OFDM as a Base for Physical Layer Flexibility Modifying characteristics by digital signal processing 8

9 Enhanced Multiple-Access Schemes Application of non-orthogonal access schemes, e.g. NOMA or SCMA Usage of advanced interference cancellation techniques Exploitation of pathloss differences between the users Random access based data transmission 9

10 Duplex Arrangement FDD dominating in lower (licensed) bands Coverage benefits Avoids some nasty interference situations (BS BS, device device) TDD more relevant for higher bands targeting very wide bandwidths in dense deployments Easier to find unpaired spectrum More dynamic traffic variations Access nodes and devices becoming more similar 10

11 Beam-Forming Applications 5G air-interface optimized for beam-formed operation Beam-centric design considerations: Self-contained transmissions allowing for rapid beam re-direction Beam mobility Mobility between beams rather than nodes System plane matched to beam-formed user plane 11

12 Device-to-Device Communication D2D communication as well-integrated part of the overall wireless access solution Direct peer-to-peer D2D communication as an overall more efficient mode Direct D2D communication as a means to extend coverage (device based relaying) High-speed inter-device communication provides joint transmission and/or reception between multiple devices (cooperative devises) 12

13 Ultra Lean Design Minimize network transmissions not directly related to user-data delivery Resources are treated as undefined unless explicitly indicated otherwise Advantages Reduce interference Higher achievable data rates Enhanced network energy performance Future-proof design 13

14 Decoupling of User Data and System Control Information Scale user-plane capacity independently of system control resources Well-matched to beam-formed radio-interface design Well-aligned with ultra-lean design 14

15 5G Wireless Access Evolution of existing technology + New radio-access technology LTE will be integral part of the overall 5G radio solution Application of selected 5G technologies also to LTE-Advanced 15

16 5G Technologies Interworking 5G shall tightly interwork with existing 4G networks Offers a smooth way for migration to 5G Dual connectivity Initial deployment on higher bands for extreme traffic capacity and data rates LTE on lower bands for full coverage and robust mobility Smooth introduction of 5G in new spectrum User-plane aggregation Migration into legacy bands while retaining full bandwidth availability for new devices Smooth migration of new RAT into legacy bands 16

17 SDN & NFV as Enablers for 5G Network Function Virtualization (NFV) is complementary to Software Defined Networking (SDN) SDN: Abstraction and programmability of virtualized transport NFV: Realization of network functions on commodity IT servers by means of virtualization and cloud technologies SDN and NFV provide means to fulfill future requirements of a 5G architecture Open interfaces To help integrate different components holistically HW independency Possible due to decoupling of SW and HW Pre-standardization by ETSI NFV-ISG Source: Network Functions Virtualisation Introductory White Paper, ETSI,

18 Software Defined Networking 18

19 Network Function Virtualisation (NFV) Source: Network Functions Virtualisation Introductory White Paper, ETSI,

20 SDN & NFV Properties Benefits CAPEX reduction Use of high volume industry standard hardware (e.g. x86-based servers) Open interface for holistic integration of components & applications Multi-vendor ecosystem for HW, platform and telco applications (avoiding vendor lock-in) Multiplexing gain: Optimization of resource sharing between different services OPEX reduction Quick & easy deployment of new services Dynamic and flexible resource allocation (scale-in/ scale-out) Energy efficient operation (shut-down of unused resources) Resiliency Fault tolerance - resource usage by different geographical areas Auto-healing Challenges Significant overheads: processing power, signaling, etc. Increased complexity of operation Handling of latency for delay critical items 20

21 Mobile Network Architecture Evolution Path 21

22 5G Status Currently (Dec. 2015), 5G is still in a research stage with various activities Europe: METIS, HORIZON 2020, METIS-II, North-America: many university programs Asia: activities in Japan, China and South-Korea Cooperation between university research groups, manufacturers and operators just started Many 5G research centers around the world In Europe: Public-Private-Partnership (PPP) projects Demonstration of some 5G capabilities: 10 GBps, 1 ms, Also focus on new applications such as IoT, Car2x, Operators are already defining their requirements for the new system White papers from 4G Americas, NGNM The ITU-R is working on the requirements Preparation for World Radio Conference GPP has just started their work on 5G First RAN workshop on 5G in Sep The requirements and scope of the new radio interface will be established by RAN in a new SI starting in December 2015 There shall be new SI on system architecture to be approved by SA 22

23 5G Timeline Phased Approach NGMN and ITU aligned, with an initial 5G in 2 nd Half

24 5G Literature and References 5G research papers G. Fettweis, S. Alamouti: 5G: Personal Mobile Internet beyond What Cellular Did to Telephony, IEEE Com. Mag., Feb. 2014, pp A. Osseiran et al: Scenarios for 5G Mobile and Wireless, Communications: The Vision of the METIS Project, IEEE Com. Mag., May 2014, pp E. Dahlman et al: 5G Wireless Access: Requirements and Realization, IEEE Com. Mag., Dec. 2014, pp G. Wunder et al: 5GNOW: Non-Orthogonal, Asynchronous Waveforms for Future Mobile Applications, IEEE Com. Mag., Feb. 2014, pp P.K. Agyapong et al: Design Consideration for a 5G Network Architecture, IEEE Com. Mag., Nov. 2014, pp G white papers NGMN Alliance: 5G White Paper, Feb G Americas: 5G Technology Evolution Recommendations, Oct ITU-R: IMT Vision Framework and overall objectives of the future development of IMT for 2020 and beyond, Recommendation ITU-R M , Sep