Dimensioning, configuration and deployment of Radio Access Networks. part 5: HSPA and LTE HSDPA. Shared Channel Transmission

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1 HSDPA Dimensioning, configuration and deployment of Radio Access Networks. part 5: HSPA and LTE Enhanced Support for Downlink Packet Data Higher Capacity Higher Peak data rates Lower round trip delay Part of release 5 Similar to cdma2000 EV DO Shared Channel Transmission Higher order Modulation Fast Link adaptation Fast hybrid ARQ (MIMO to be considered for later releases) Shared Channel Transmission HSDPA - Shared channel transmission Efficient code and power utilization by dynamically sharing radio resources among multiple users Time domain (TTI = 2 ms) Code domain (up to 15 codes) Not all UEs are capable to receive data in consecutive TTI (Minimum inter-tti > 1) CC are not orthogonal due to multipath propagation self interference generated in the cell affecting capacity SF=1 SF=2 SF=4 SF=8 SF=16 Channelization codes allocated for HS-DSCH transmission 8 codes (example) TTI Shared channelization codes User #1 User #2 User #3 User #4

2 Channel coding and throughput Higher order Modulation Channel coding at rates 1/4-3/4 Dynamically changed Allows for higher peak data rates QPSK 480kbps channel bit rate per code 16QAM 960kbps channel bit rate per code Requires higher SNIR Smaller cells Shared channel transmission Radio channel conditions changes fast due to: Interference variations Path loss and shadowing Multipath fading HS-DSCH channel rate control = constant power Adaptive channel coding Adaptive modulation (QPSK <-> 16QAM) Fast adaptation - TTI=2 ms Available rate is adjusted by selecting a Transport Format and Resource Combination (TFRC) The achievable rate dependent on: Available HS power Radio conditions UE category Available # HS codes 16QAM availability Load Fast link adaptation Modulation, coding and data rate Modulation QPSK 16QAM Coding rate Throughput 5 CC Throughput 10 CC Throughput 15 CC 1/4 600 kbps 1.2 Mbps 1.8 Mbps 2/4 1.2 Mbps 2.4 Mbps 3.6 Mbps 3/4 1.8 Mbps 3.6 Mbps 5.4 Mbps 2/4 2.4 Mbps 4.8 Mbps 7.2 Mbps 3/4 3.6 Mbps 7.2 Mbps 10.8 Mbps 4/4 4.8 Mbps 9.6 Mbps 14.4 Mbps

3 SINR vs throughput Capacity management overview 3G RAN Throughput is a function of modulation, coding and SNIR - DL power - DL codes - UL interference Channel elements in NodeB Transmission (x E1) RNC Air interface limitations HW limitations Power control and rate control Deployment strategy example RNC Power control Constant bit rate 384 kbps 384 kbps 384 kbps 384 kbps R99 Power controlled Mature phase Deployment phase f2: R99 + HS f2: R99 + HS f2: R99 + HS RNC 5Mbps 3Mbps Rate control Constant DL power 0.5Mbps 1Mbps R5 Rate controlled Initial phase f1: R99 Hot spots Dense urban Urban Suburban f1: R99 Rural

4 data1 data2 data3 data4 HSPA and LTE = Mobile Broadband HSPA High-Speed Packet Access ( Turbo-3G ) Gradually improved performance in existing 3G networks LTE 4G Mobile Broadband A SHORT SUMMARY ON BEHALF OF ERICSSON LTE Long-Term Evolution ( 4G ) Significantly higher performance and user experience in a wide range of spectrum allocations Packet-switched services only Fulfills IMT-Advanced requirements WCDMA HSDPA HSPA HSPA evolution LTE LTE-Advanced Stefan Parkvall Requirements Studies Spec s LTE 4G Mobile Broadband From early studies LTE Basic Radio-Access Principles OFDM transmission Testbed 2007, 20 MHz, 2x2 MIMO LTE Testbed 2007 via trials Multi-antenna support Channel-dependent scheduling ICIC Hybrid ARQ Dual-layer beamforming Positioning Multi-antenna extensions Relaying m Bandwidth flexibility FDD and TDD support MBMS Carrier Aggregation Rel-8 Rel-9 Rel-10 to commercial operation! Basic LTE functionality Enhancements & extensions Further extensions IMT-Advanced compliant

5 Transmission Scheme Multi-antenna Transmission Downlink OFDM Parallel transmission on large number of narrowband subcarriers Uplink DFTS-OFDM DFT-precoded OFDM IFFT Cyclic-prefix insertion DFT precoder DFT OFDM modulator IFFT Cyclic-prefix insertion Diversity for improved system peformance (robustness) Beam-forming for improved coverage (less cells to cover a given area) Benefits: Avoid own-cell interference Robust to dispersion Main drawback Power-amplifier efficiency Tx signal has single-carrier properties Improved power-amplifier efficiency Improved battery life Reduced PA cost Critical for uplink Equalizer needed Rx Complexity Not critical for uplink SDMA for improved capacity (more users per cell) Multi-layer transmisson ( MIMO ) for higher data rates in a given bandwidth The multi-antenna technique to use depends on what to achieve Spectrum Flexibility Supported Frequency Bands Operation in differently-sized spectrum allocations Core specifications support any bandwidth from 1.4 to 20 MHz Radio requirements defined for a limited set of spectrum allocations ITU: General Mobile IMT IMT IMT IMT Band 34 Band 38 Band 3 Band 33 Band 1 Band 7 Band Band MHz 3 MHz 5 MHz 10 MHz 6 RB ( 1.4 MHz) 15 MHz 20 MHz 100 RB ( 20 MHz) Support for paired and unpaired spectrum allocations with a single radio-access technology economy-of-scale Regional Band 4 Band (Band 37) Band 35 Band Band Band 11 & 21 (Japan) Band 9 (Japan) Local Band 39 (China) Legend: FDD Half-duplex FDD (terminal-side only) TDD Paired Uplink Paired Downlink Unpaired

6 data1 data2 data3 data4 Supported Frequency Bands LTE Continuous Evolution ITU: 698 IMT 960 OFDM transmission Band 8 General Multi-antenna support ICIC Dual-layer beamforming Multi-antenna extensions Band 20 Regional Band 17 Band 12 Band Band 14 Band 5 Channel-dependent scheduling Bandwidth flexibility Hybrid ARQ FDD and TDD support Positioning MBMS Relaying Carrier Aggregation Rel-8 Rel-9 Rel-10 Band 18 &19 (Japan) Local Basic LTE functionality Enhancements & extensions Further extensions IMT-Advanced compliant Legend: Paired Uplink Paired Downlink Relaying Rel-10 Repeater Possible already in Rel-8, simply amplifies and retransmits recevied signal Relaying (added in Rel-10) Relay = small base station connected to RAN using LTE radio resources Mainly interesting if fibre/microwave backhaul is more expensive than using LTE spectrum HetNets What? Low power nodes placed throughout a macro-cell layout Heterogeneous Networks Why? High data rates dense infrastructure...but non-uniform user distribution Macro for coverage, pico for high data rates How? Relay cell Donor cell Conventional Independent pico cells Relay Independent relay cells Relay connected to macro RRU Remote pico antenna, processing in macro No new pico cells

7 The Wireless Evolution More Reading Open the 3GPP specifications... Additional functionality and capabilities Everything is connected Improved performance New application areas 50 billion devices Need for new business models?...or read The Book! Available in English, Chinese, Korean and Japanese.

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