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

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

  1. 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. 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. 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. 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. 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. 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. 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. 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. 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. 10. Thank You!