The differentiated techniques to co deploy in the macro and small cell layers

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Presented by Changyoung Kim, SK Telecom on December 4, 2012 in 5th Small Cells Americas, Dallas, TX

Presented by Changyoung Kim, SK Telecom on December 4, 2012 in 5th Small Cells Americas, Dallas, TX

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  • 1. The Differentiated Techniques to Co-Deploy in the Macro and Small Cell Layers SK Telecom / December 4, 2012 Changyoung Kim 5th Small Cells Americas, Dallas, TX WINNER
  • 2. 1 Table of Contents I. LTE Traffic and Service Usage II. LTE Small Cell Solutions III. Unique Solutions IV. Future Plan for the Small Cell
  • 3. 2 Data Service Usage Pattern & Growth Rate Ⅰ. LTE Traffic and Service Usage SKT’s Mobile Traffic Trends  Dramatic increase of mobile traffic - Due to the increasing number of smartphone users and the spread of LTE July 2010 Dec. 2010 June 2011 Dec. 2011 June 2012 297 2,303 5,880 10,447 16,657 (Unit: Terabyte / Month) Multimedia (34.7%) Web Portal (33%) App. Market (13.6%) Etc. (13.5%) SNS (5.2%) [ LTE Traffic Volume Ratio, June 2012 ] Growth Rate (After Oct. 2011) Multimedia x 115 Web Portal x 96.7 App. Market x 31.9 SNS x 135 • SKT has acquired over 6M subscribers in just 1.3 years after launch, firmly establishing it’s position as the LTE Market leader in Korea and playing a key role in popularization of LTE • With the spread of LTE smartphone users, usage patterns such as Mobile multimedia, SNS have been dramatically increased and will keep growing at a rapid pace
  • 4. 3 II. LTE Small Cell Solutions Interference ManagementSKT LTE Femto Internet Coverage Extension Hot zone Data Offloading Aggregation/ Security GW Macro Data Offloading EMS/SON Server Macro eNB Info. Femto-Cell ICIC Server Premium In-building Service  Capacity enhancement/data offloading in in-building hot zones - Connected to LTE Core via Public broadband N/W - IPSec provides security functions  High-quality mobility and flexible N/W configuration by adapting Femto GW  Femto-Cell ICIC server will provide the performance enhancement in the cell edge - Frequency selective scheduling and power control will be applied from information exchange between Femto to Femto or Femto to Macro  Rel-8/9 CoMP (DL Coordinated Scheduling) has been applied based on A-SCAN (Cloud-RAN) - UL-CoMP trial with interference rejection combining in Oct. 2012, and commercialization will be in 2013 - Evolution to Rel-11/12 CoMP (Joint Transmission/Dynamic Point Selection)  eICIC has been trialed in July 2012, and plan to be commercialized in 2013 • Small cell is the most powerful way to increase N/W capacity, but efficient interference management schemes should be supported
  • 5. 4 III. Unique Solutions 1. X2 I/F between Macro and Femto • Although X2 I/F between Macro and Femto are being developed in 3GPP, SK Telecom already commercialized LTE Femto with X2 I/F on June, 2012 • With X2 I/F, Femto has secured a stable H/O between the Femto and Macro by processing a greater number of H/O message and increasing the rate of H/O success by 6.5%P LTE Femto Network Topology  X2 I/F Management - X2 setup and eNB configuration update - Information management used for SON and connection process on SCTP between Femto – FGW – eNB  X2 Mobility Management - Process of H/O messages(Request/Ack/Failure) - UE X2AP ID mapping, E-RAB Setting  Transfer X2 Load Information - Broadcast load information of Macro to all Femtos included in FGW  X2 User Plane - DL data forwarding between Macro – Femto - TEID & IP mapping Main Features of X2 FGW
  • 6. 5 III. Unique Solutions 2. Interference Mitigation Solution • A centralized interference coordination system and femtocells with proprietary message interface for ICIC • Coordinates inter-cell interference between femtocells with resource partitioning • Protects macrocells downlink/uplink from interference of femtocells Femto to Macro Interference ControlFemto to Femto Interference Control  Flexible ICIC Interface - Resource partitioning for ICIC can be operated in time or frequency domain - Depending on backhaul latency and server load, FFR can be applied in both static and dynamic modes  FFR based ICIC Scheme - FICS assigns sub-band sets for CCU and CEU after considering the relation between adjacent Femtos  Femto Tx Power Control - Rough power control based on periodic N/W listening - Fine power control based on CQI statistics from F’s UEs - Rapid power adjustment for Macro UE protection based on abrupt UL interference level  UL Power Control Parameter Adjustment - M’s UL protection based on X2(HII, OI) message listening Subband for CCU Subband for CCU Subband for CCU Cell-A Cell-B Cell-C Subband for CEUpwr FICS (Femtocell IC System) HeNB Macro eNB Adjacent eNB Info. DL/ UL Power Control Parameters Uplink High Interference/ Overload Information X2 Interface Macro UEMacro UE Macro eNBs Femto Gateway (X2 proxy)
  • 7. 6 III. Unique Solutions 3. Smart Interworking Femto with SON • A centralized optimization system of H/O and coverage parameters between Macro and Femto (& Femto and Femto) • A centralized management system to configure PCI and to avoid RSI collision between Macro and Femto (& Femto and Femto) Interworking Process between Femto and SON Server SKT SONFMS Macro EMSOperator  Input the default PCI/RSI and longitude/latitude for new Femto  After Femto starts up with initial information, register neighbor list using sniffing  Transfer data what gets during work sniffing  Register PCI of the Femto in the Macro Neighbor  Assign PCI/RSI  Update PCI/RSI  Transfer Sniffing and PCI data Femto  Transfer Initial PLD
  • 8. 7 III. Unique Solutions 4. FRS(Femto Repeater System) • FRS can be used to extend in-building coverage without interference between Femtos • It has a system having separated DU and RU(Advantage to extend coverage) • It has no H/O zone within RUs(Advantage at the existing Femto cell edge) • When an operator wants to change the service frequency, it is supported just by replacing RU Topology using FRSTopology using only Femto  Conventional - It can service only small cell - Interference rise between Femtos - Low data speed at the overlap region - Bad RF quality frequent H/O between Femtos  Advanced - It can service relatively large size cell - There is no interference between RUs - Uniform data speed in the most of service region - There is no H/O between RUs
  • 9. 8 ’12.1Q ’12.2Q ’12.3Q ’12.4Q 2013 ~ 850MHz LTE Femto commercialization FICS(Femto Interference Coordination System) Carrier Aggregation planned  World’s first LTE Femto commercialized in June 2012  3GPP Rel.9 based(32UE, 2x2 MIMO, Dual-band Wi-Fi, PoE, NTP)  World’s first FICS trialed in September 2012  Verified improved T/P between Femtos(25%), between Femto – Macro(15%)  Development in 2013  speed and capacity improvement by binding dual bandwidths IV. Future Plan for the Small Cell : Trial : Commercialization LTE Femto • SK Telecom commercialized world first LTE Femto cell in 2012 and plans to launch Carrier Aggregation technology at the Femto in 2013 LTE Femto (Residential) FRS
  • 10. Thank You!