LTE and Network Evolution

Transcription

1 ITU-T Workshop on Bridging the Standardization Gap and Interactive Training Session (Nadi, Fiji, 4 6 July 2011 ) LTE and Network Evolution JO, Sungho Deputy Senior Manager, SKTelecom Nadi, Fiji, 4 6 July 2011

2 Contents I. SKT s Network Strategy and LTE Data Traffic Explosion SKT s Network Evolution SKT s Network Strategy SKT s LTE Deployment Ⅱ. Technology Evolution and LTE Technology Evolution LTE Requirements LTE Network Architecture LTE Advanced Technology Ⅲ. Technical Challenges in LTE Deployment Seamless Operation Heterogeneous N/W & Network Automation(SON) Ⅳ. SKT s RAN Evolution: SCAN (Smart Cloud Access Network) Cloud Architecture Smart Network Technologies 1

3 Ⅰ. SKT s Network Strategy and LTE Data Traffic Explosion In recent years, SKT s analysis shows small increase in voice traffic, but explosive increase in data traffic due to popularization of smart devices. Voice Traffic Trend Data Traffic Trend Voice Traffic Saturation - CAGR for voice traffic increases by 5% - Increasing rate diminishes after 09 Voice (seconds/month, x 109) Data Traffic Explosion - CAGR for data traffic increases by 106% - Data traffic explosion after 09 (About 9 times increase from 09 to 10) Data (TB/month) 9 times Data Traffic Explosion is World-wide Trend 2

4 Ⅰ. SKT s Network Strategy and LTE SKT s Network Evolution SKT s mobile network has evolved by rapid adoption of new technologies, and LTE-based evolution is on-going to offer top-class services continuously in the era of data explosion. SKT s Network Evolution History Complementary solution for Hotspot LTE High quality voice and low-rate data services IS-95A/B 1996 World-first CDMA x EV-DO CDMA2000 1X World-first CDMA x/EV-DO WCDMA 2003 World-first WCDMA R4 Always First S-DMB 2005 World-first Satellite DMB WiBro HSDPA 2006 World-first Handset-based HSDPA HSUPA 2007 World-first 5.76Mbps HSUPA HSPA First HSPA+ in Korea Medium-rate data and new services (Video Call, Global Roaming) 2011 First LTE in Korea 4G Network evolution for high data rate service 2G 2.5G 3G 3.5G 4G 3

5 Ⅰ. SKT s Network Strategy and LTE SKT s Network Strategy SKT s network portfolio efficiently copes with the data traffic explosion by hierarchical multi-solution considering the traffic characteristics IS IS--95A/B 1X/DO IS-95A/B, CDMA 1X/EVDO IS-95A/B: Nationwide 1X/DO: 92% Population Seoul 800MHz (BW 15MHz) 38% of total subscribers WCDMA (HSPA) WiBro (Mobile WiMax) Nationwide coverage 2.1GHz (BW 30MHz) 62% of total subscribers 06 07~ Seoul Data Demand in Hot Zone (Campus, Home, Office, etc.) Cell Coverage Reduction for Higher Data Rate New Deployment Concept for Mobile Broadband Data Traffic JEJU Seoul SKT s strategy for Mobile Broadband Basic IP Service Voice Service Macro Micro Optimal Network Portfolio Pico High-speed Data Demand JEJU Metropolitan area (Seoul) Hot zones in major cities 2.3GHz (BW 27MHz) JEJU Multimedia IP Service WiFi/ WiBro LTE WCDMA/ CDMA Hot Spot Hot Zone Metropolitan Coverage Nationwide Coverage

6 Ⅰ. SKT s Network Strategy and LTE SKT s LTE Deployment In July of 2011, SKT will provide the First LTE Service in Korea. LTE will be used for dealing with high data traffic in metropolitan area over nationwide WCDMA/HSPA ( 11/ 12), then extended to nationwide coverage ( 13). SKT s LTE Plan 2011: First LTE service in Korea ( 11, July) with data card type terminal (Handset type terminal will be available in 2ndhalf of 11) First LTE service in Seoul ( 11) SKT s LTE Deployment 2012: Coverage extension to major cities 2013: Nationwide coverage ~ Seoul Network Development /Deployment Major city Nationwide Terminal Development /IOT Data Card Handset LTE coverage extension to Major Cities ( 12) 5

7 Ⅱ. Technology Evolution and LTE Technology Evolution CDMA-based mobile technology is evolving to OFDMA-based technology for high data rate service. LTE will provide 3~15 times peak data rate as compared to HSPA IMT2000 (3G) IMT Advanced (4G) 3GPP (Asynchronous) GSM DL 9.6kbps WCDMA HSDPA HSUPA HSPA+ LTE DL 384kbps DL 14Mbps DL 14Mbps DL 21Mbps DL 300Mbps LTE Advanced DL 1Gbps 3GPP2 (Synchronous) UL 9.6kbps IS95 DL 14.4kbps UL 64kbps UL 64kbps UL 5Mbps UL 5Mbps UL 150Mbps UL 500Mbps 1x cdma2000 DL 153.6kbps EVDO Rev.A Rev.B UMB DL 2.4Mbps DL 3.2Mkbps DL 14.7Mbps DL 300Mbps UL 14.4kbps UL 153.6kbps UL 153kbps UL 1.8Mbps UL 5.4Mbps UL 150Mbps CDMA-based technology OFDMA-based technology Mobile Broadband CDMA(Voice-oriented): Connectivity, Circuit, Soft Handover OFDMA(Data-oriented): Wider Bandwidth, Packet, Less Interference 6

8 Ⅱ. Technology Evolution and LTE LTE Requirements Peak data rate Capacity Latency Mobility Handover Spectrum 100 Mbps DL/ 50 Mbps UL within 20 MHz bandwidth (DL : 5bps/Hz, UL : 2.5bps/Hz, 2x2 MIMO default) Up to 200 active users in a cell (5 MHz) Less than 100 ms on control-plane(idle to Active) Less than 5ms on user plan(unload condition, one-way transmit time bw UE ~ RAN Edge node) Optimized for 0 ~ 15 km/h, 15 ~ 120 km/h supported with high performance Supported up to 350 km/h or even up to 500 km/h Hard Handover Flexibility: 1.4, 3, 5, 10, 15, 20 MHz User Equipment Duplex Support up to 20 MHz FDD, TDD 7

9 Ⅱ. Technology Evolution and LTE LTE Network Architecture EPC P-GW MME S-GW SAE System Architecture Evolution S1 Long-Term Evolution LTE enb enb enb X2 enb EPC: Evolved Packet Core MME: Mobility Management Entity P-GW: Packet Data Network Gateway S-GW: Serving Gateway 8

10 Ⅱ. Technology Evolution and LTE LTE-Advanced Technology LTE will evolve to LTE-A(Advanced) to enhance the capacity, QoS, and N/W flexibility. SKT will provide LTE-A service in LTE-A Technology Carrier Aggregation (Up to 100Mhz) Carrier Contiguous Aggregation CarrierAggregation Non-Contiguous Relay Station BS Relay for capacity increase Relay for coverage extension MIMO (up to 8 8) CoMP(BS Cooperation) BS B A BS A A BS BS Spatial Multiplexing Transmit Diversity Coordination 9

11 III. Technical Challenges in LTE Deployment Seamless Operation Seamless operation is one of most important issues for LTE deployment in multi-n/w environment N/W Selection N/W Redirection Selecting serving N/W based on customer profiles, operator policy and terminal types Redirecting requested calls into other N/W (e.g., CS Fallback) Seamless Handover Supporting continuity and mobility of voice/data calls Seamless Voice Service CS Fallback based on 3GPP-R9 standard/ IMS-based mvoip m-voip or Voice H/O Hot Zone/Nationwide Redirection LTE Nationwide WCDMA Data H/O m-voip & Hi-speed Data Voice & Low-speed Data Multi-Mode Multi-Band Terminal 10

12 III. Technical Challenges in LTE Deployment HetNet & SON Heterogeneous Network Network Automation (SON) Heterogeneous network maximizes the spatial reuse gain, and deals with non-uniform traffic. Network operation and management can be automated by SON technologies. Conventional (Voice-oriented) Self-Configuration Plug and Play Macro Cell Repeater Pico Cell Weak Spots (High Interference) Automated setup and configuration SON(Self Organizing Network) HetNet (Data-oriented) Pico WiFi Relay Biz. Cell Macro Cell Femto Self-Optimization Auto Tune Real-time network optimization Self-Healing Auto Repair Fast, autonomous failure mitigation Hot Zone 11

13 IV. SKT s RAN Evolution : SCAN Smart Cloud Access Network SKT s RAN(Radio Access Network) architecture is evolving to SCAN in order to reduce the network cost and enhance the capacity Cloud Access Network Cloud-based digital processing Centralized cloud DU BS virtualization by real-time cloud processing Resource sharing (pooling) Efficient maintenance Smart SCAN Cloud Smart Access Network BS cooperation in cloud architecture Interference management and Cooperative Tx/Rx Load balancing & Traffic optimization Software Defined Radio Self Optimization Network Cost Reduction Flexible Network Architecture Capacity Improvement Eco-Friendly Technology 12

14 IV. SKT s RAN Evolution : SCAN Evolution to Cloud Architecture Unified DU/RU Separate RU DU/RU Centralized DURU Cloud DU RU Cloud Architecture DU Cloud DU DU-RU Interface Distributed RU Core Network Centralized Digital Processing in Cloud DU First step: Separate DU/RU & Centralized DU Second step: BS virtualization by real-time cloud processing Flexible Network Architecture Efficient resource management via virtualization Flexible network configuration using open platform 13

15 IV. SKT s RAN Evolution : SCAN Smart Network Technology Evolution to Smart Network: Cloud-based BS cooperation, SDR, Self-optimization Cloud DU Monitoring of traffic and user QoS RU1 DU-RU Interface Cooperative Transmission Cell-edge User RU2 Central processing for BS cooperation Cloud-based BS Cooperation : Network Capacity Enhancement Cooperative Radio Resource Management Multi-cell Transmission based on Multi-antenna Scheme Load Balancing and traffic optimization SDR (Software Defined Radio) to support multi-technology 14

16 Thank You 15