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LTE-A : 4G Wireless Broadband Networks

LTE-A : 4G Wireless Broadband Networks. 中山大學 電機系 許蒼嶺教授. 行動通信標準演進. 1x EVDO. HRPDA. CDMA 2000-1X. 1x EVDV Rel. C. 1x EVDV Rel. D. Evolution of Wireless Access Technologies. 4G Air Interfaces. Wide Area. Mobile. 3GPP2. MOBILE BROADBAND. LTE. UMTS. GPRS. EDGE. GSM. HSPA.

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LTE-A : 4G Wireless Broadband Networks

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  1. LTE-A : 4G Wireless Broadband Networks 中山大學 電機系 許蒼嶺教授

  2. 行動通信標準演進

  3. 1x EVDO HRPDA CDMA 2000-1X 1x EVDV Rel. C 1x EVDV Rel. D Evolution of Wireless Access Technologies 4G Air Interfaces Wide Area Mobile 3GPP2 MOBILE BROADBAND LTE UMTS GPRS EDGE GSM HSPA 3GPP 802.16e (Mobile WIMAX) Mobile Industry Coverage/Mobility Nomadic Metro Area 802.16a/d (Fixed NLOS) Fixed Wireless Industry 802.11n (smart antennas) 802.11 Mesh extns. 802.16 (Fixed LOS) DSL Experience Dial Up Local Area Fixed 802.11b/a/g Data Rates (kbps) 100,000 + Higher Data Rate / Lower Cost per Bit

  4. 3GPP

  5. 3GPP Radio Access Milestones

  6. Application services IMS Layer Mobility, Policy and Administration Services Core network EPC Access technologies connection gateways Access Technologies Devices Operator’s Service Stack LTE WiFi WiMAX DSLAM

  7. Population penetration of mobile, fixed and broadband across Asia-Pacific

  8. TDMA/OFDM/OFDMA

  9. Modulations & Channel Size Uplink Mandarory US European Downlink Mandarory Access Range: QPSK > QAM-16 > QAM-64 Data Rate: QAM-64 > QAM-16 > QPSK

  10. Frame Durations with TDD Frame Structure 0.5/1/2 ms

  11. Number of PS in 16-QAM • Frame duration = 1 ms • Signal (Baud) rate = 16 Mbauds/sec • 4 bits in a signal (baud) using 16-QAM • Ts=LT, Data rate, R = LS = 4 x16 = 64 Mbps • Number of PS (Physical Slot) • (64 Mbps x 1 ms) / 16 bits = 4000 • Assume every PS = 16 bits

  12. 4G: LTE-A vs IEEE 802.16m • ITU-R’s IMT-Advanced (4G) requirements • up to 1 Gbps in static or low mobility environment • up to 100 Mbps in high-speed mobile environment • Multicarrier is the technology to utilize wider bandwidth for parallel data transmission across multiple RF carriers. • IEEE 802.16m • LTE-A • Carrier Aggregation (CA) • Component Carrier (CC)

  13. IEEE 802.16m OFDMA Parameters

  14. 802.16m Guard Bands

  15. Baud Rate B: baud rate, number of symbols in one second S: number of symbols in an OFDMA frame T: OFDMA frame duration N: number of carriers in an OFDMA frame B = ( ) x N

  16. Data Rate vs Baud Rate R: data rate (bps) M: number of different signal elements in MCS B: baud rate, number of symbols in one second R = B x

  17. LTE Frame Structure Assume total BW = 30 Mhz and 64-QAM One sub-carrier = 15 Khz Total sub-carriers = 30 MHz/15 Khz = 2000 sub-carriers Total capacity (Data rate) = 2000 x 14000 symbols/sec x 6 bits/symbol = 168 Mbps One OFDMA frame (10 msec) = 10 sub-frames One sub-frame (1 msec) = 2 slots One slot (0.5 msec) = 7 symbols Symbol rate = 7/0.5 msec = 14000 symbols/sec One RE = One symbol x one sub-carrier One RB = 7 symbols x N sub-carriers

  18. Frame time = 5 msec , Number of carriers = 192 Data Rate = (360/5 msec)x192= 13.824 Mbps

  19. LTE-A Enhanced Multicast Broadcast Service (EMBS)

  20. Channel Coding Systematic bits Turbo coding 1/3 Mapping to the circular buffer Systematic bits Parity bits

  21. 不同重傳次數的HARQ封包 RV=0 RV=1 RV=2 RV=3 1st transmission 2nd transmission 3rd transmission 4th transmission Coding rate=3/4

  22. HARQ在Uplink的運作流程 ERROR MN BS NACK ACK success ERROR 1st transmission 2nd transmission || 3rd transmission + 4th transmission MN’s HARQ buffer BS’s HARQ buffer

  23. LTE-A: E-MBS Deployment with Broadcast Only and Mixed Carrier

  24. LTE-A: Carrier Types • From the perspective of an advanced MS (AMS) • Primary carriers • exchanges traffic and control signals with an advanced BS (ABS) • mobility, state, and context • Secondary carriers • An ABS can additionally assign secondary carrier(s) to an AMS • Controlled by the ABS through the primary carrier

  25. LTE-A: Carrier Types • From the perspective of an ABS • Fully configured carrier • carrying all control channels • synchronization, broadcast, multicast, and unicast control channels • both single-carrier and multicarrier AMSs can be served • Partially configured carrier • primarily to support downlink only transmission • only for frequency-division duplex (FDD) deployment • a dedicated EMBS carrier is one example

  26. Multicarrier Frame Structure(LTE-A and WiMAX 802.16m) • An example of multicarrier frame structure with legacy support.

  27. Multicarrier Transceiver Architectures (LTE-A) • Basic concept of subcarrier alignment.

  28. Multicarrier Transceiver Architectures (LTE-A) • Different types of AMS transceiver architecture for multicarrier aggregation.

  29. Network Entry (LTE-A) • Network entry procedure for multicarrier support. • AAI: Advanced Air Interface

  30. Activation and Deactivation ofAssigned Carriers (LTE-A) • Multilevel carrier management scheme.

  31. Handover (LTE-A)

  32. Relay Related Connections

  33. Fractional Frequency Reuse (FFR) for Directional Antenna

  34. CA Scenarios and Component Carrier (CC) Types (LTE-A) • Example of carrier aggregation scenarios: • a) contiguous aggregation of five component carriers with equal bandwidth • b) non-contiguous aggregation of component carriers with different bandwidths

  35. Primary and Secondary CCs (LTE-A) • UE served bPCell/SCell configuration for different y the same eNB

  36. LWA/LTE-U/LAA/LSA • LWA (LTE WiFi Aggregation) • Co-allocated and Non-co-allocated mode • Build UDP/TCP tunnel on the top of PDCP • LTE-U (Unlicensed): • CSAT (Carrier Sense Adaptive Transmission) • LAA (License-Assisted Access) • 在2016/3的3GPP Release 13中正式定名為LAA • LBT (Listen Before Talk) • LAA-FDD (Rel. 13): 只有Downlink可以使用Unlicensed band • LAA-TDD (Rel. 14): Uplink/Downlink都可使用Unlicensed band • LSA (License-Shared Access):2.3Ghz Licensed Band • LSA controller • LSA incumbent • LSA repository

  37. LSA 互連實驗室 電信技術中心頻譜共享實驗室 台灣大學動態頻譜接取實驗室 LSA Controller ETSITS 103 379? Http NTU LSA Spectrum Repository/GLDB LSA Repository LSA Controller Http LSA Incumbent Http/PAWS 1.8GHz Network Manager Co-RAN Sharing Coordination OAM 網路管理系統 演進節點基地台 eNodeB Short Interval Secondary Auction Platform 2.3GHz EPC 演進封包核心網路 用戶終端 UE Incumbent: SFE100 TEST transmitternsmitter 核心網路 Core Network 接取網路 Access Network 中山大學行動寬頻示範教學實驗室

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