The document provides an overview of LTE (Long Term Evolution) network architecture and transmission schemes. It describes the simplified LTE network elements including eNB, MME, S-GW and P-GW. It explains the downlink transmission scheme using OFDMA and reference signal structure. It also covers uplink transmission using SC-FDMA, control and data channels as well as frame structure in both FDD and TDD modes.

1. Arief Hamdani Gunawan 21 November 2009

7. 3G deployment in the world China Mobile NTT DoCoMo （ 2010 ） KDDI Verizon （ 2009 ） AT&T W （ 2010 ） Vodafone （ 2011 ） T-Mobile （ 2010 ） China Telecom HSPA+ DL>40MBps; UL>10Mbps TD-HSDPA 2.8~8.4Mbps TD-HSUPA 2.2~6.6Mbps WCDMA 384Kbps HSDPA 1.8/3.6Mbps HSDPA 7.2Mbps HSUPA 1.4~5.8Mbps LTE TDD DL:100Mbps UL:50Mbps TD-HSPA+ DL:>25.2Mbps UL:>19.2Mbps EV-DO Rel. 0 DL: 2.4Mbps UL:153.6kbps cdma2000 1x 153.6kbps D0 Rel. A DL: 3.1Mbps UL: 1.8Mbps Do Rev B (Multi Carrier DO) DL ： 46.5Mbps UL: 27Mbps LTE FDD DL:100Mbps UL:50Mbps LTE TDD1 LTE TDD2

8. Trend of B3G ITU IMT-Advanced(4G) UMB ＋ 100Mbps-1Gbps 100Mbps~ 1Gbps LTE+ FDD/TDD DL:100Mbps UL:50Mbps LTE-FDD WIMAX 3GPP 3GPP2 B3G EV-DO Rel. 0 DL: 2.4Mbps UL:153.6kbps cdma2000 1x 153.6kbps D0 Rel. A DL: 3.1Mbps UL: 1.8Mbps Do Rev B （ 多载波 DO ） DL ： 46.5Mbps UL: 27Mbps UMB DL: 100Mbps UL: 50Mbps TD-HSPA+ DL:>25.2Mbps UL:>19.2Mbps TD-HSDPA 2.8~8.4Mbps TD-HSUPA 2.2~6.6Mbps HSPA+ DL>40MBps; UL>10Mbps WCDMA 384Kbps HSDPA 1.8/3.6Mbps HSDPA 7.2Mbps HSUPA 1.4~5.8Mbps GREAN ~600kbps GPRS/EDGE ~ 200kbps LTE-TDD DL:100Mbps UL:50Mbps 16m 100Mbps~1Gbps Mobile WiMAX Wave1 15Mbps Mobile WiMAX Wave2 30Mbps

9. 4G Technologies Mobile WiMAX 3GPP IP E2E Network IP E2E Network CKT Switched Network OFDMA - Based CDMA - Based IMT- Advanced 2008 2009 2010 2011 2012

10. Evolution of UMTS FDD and TDD driven by data rate and latency requirements

11. LTE Network Architecture

12. LTE will Ensure the Success of Mobile Internet

13. LTE Offers 10-30x Improvement on cost/performance vs. existing technologies

14. LTE – The Right Solution for Mobile Internet

15. What’s Happening in Mobile Internet World -- Device Providers --

16. LTE Key Parameters

19. Simplified LTE network elements and interfaces 3GPP TS 36.300 Figure 4: Overall Architecture eNB = E-UTRAN Node B All radio interface-related functions MME = Mobile Management entity – Manages mobility, UE identity, and security parameters. S-GW = Serving Gateway – Node that terminates the interface towards E-UTRAN. P-GW = PDN (Packet Data Network) Gateway – Node that terminates the interface towards PDN.

21. PDCP = Packet Data Convergence Protocol RRC = Radio Resource Control RLC = Radio Link Control

22. Protocol

31. System architecture evolution

33. SAE architecture [3GPP TS 23.401] Evolved Packet Core S11 S2 S3 S4 S7 S6 SGi S1 Gb Iu Rx+ X1 X1 X2 Evolved RAN aGW S5 GERAN UTRAN GPRS Core MME UPE SAE GW PCRF Operator IP services (including IMS, PSS, ...) Non-3GPP IP Access eNB eNB PDN SAE GW HSS

34. SAE architechture [3GPP TS 23.401] S1 TBD S8 X2 Operator IP service, including IMS S11 S11 S5 SGi Evolved RAN IASA aGW = MME/UPE S6a S7 TBD eNB TBD eNB aGW eNB SAE GW PDN SAE GW HSS PCRF aGW

38. Functions S1

41. GTP-U tunneling SAE GW UPE eNB Server UE L1 L2 X1 S1 S11 SGi S5 PDN SAE GW Header compression & encryption Radio L1 MAC PDCP IPv6/v4 u Application TCP/UDP RLC L1 L2 IP UDP GTP-U L2 L1 IP UDP GTP-U L2 L1 IP UDP GTP-U L2 L1 IPv6/v4 TCP/UDP Application L1 L2 IP UDP GTP-U L2 L1 IP UDP GTP-U L2 L1 IP UDP GTP-U L2 L1 Radio L1 MAC RLC PDCP ENC

42. Non-3GPP access tunneling PDN SAE GW HA AP Server UE IP L2 L1 IPv6/v4 TCP/UDP Application L1 L2 WLAN S2 SGi L2 L1 IP MIP IPv4/6 IP UDP IP MIP IPv4/6 UDP IP L2 L1 IP L2 L1 L1 L2 L1 L2

44. Channel Mapping

45. LTE Physical Signals

46. LTE Physical Channels

51. FDD (left) and TDD (right) frequency bands defined in the 3GPP (May 2009)

59. OFDMA time-frequency multiplexing

63. The LTE downlink physical resource based on OFDM

64. Parameters for downlink generic frame structure

67. Downlink reference signal structure

69. P-SCH and S-SCH structure

72. DL Physical Channel Processing

73. LTE frame structure type 1 (FDD), downlink

74. LTE frame structure type 2 (TDD)

79. OFDMA and SC-FDMA

81. SC-FDMA in comparison with OFDMA and DS-CDMA/FDE

82. SC-FDMA signal generation Localized vs. distributed FDMA

83. Uplink Slot Structure

84. Parameters for uplink generic structure

88. UL Physical Channel Processing

90. Spatial Multiplexing Spatial multiplexing allows to transmit different streams of data simultaneously on the same downlink resource block(s). These data streams can belong to one single user (single user MIMO / SU-MIMO) or to different users (multi user MIMO / MU-MIMO). While SU-MIMO increases the data rate of one user, MU-MIMO allows to increase the overall capacity. Spatial multiplexing is only possible if the mobile radio channel allows it.

91. LTE MIMO concept

93. LTE cooperative MIMO

94. Collaborative/Network MIMO overview Coordinate transmission and reception of signals among multiple bases. Reduces intercell interference and improves cell-edge performance and overall throughput. Collaborative MIMO : share user data and long-term noncoherent channel information. Coherent network MIMO : share user data and short-term coherent channel information.

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