LTE Radio Network Planning Tutorial from IS-Wireless

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Dr Slawomir Pietrzyk, CEO of IS-Wireless, delivered a tutorial entitled: LTE Radio Network Planning during the Networking 2012 conference which was held in Prague, Czech Republic, on the 21st of May, 2012.

Abstract:
LTE radio interface (i.e., E-UTRA) is build around OFDMA, SC-FDMA and MIMO. This is a different set of radio transmission techniques than the one used in the previous 3GPP standards (such as GERAN or UTRAN). OFDMA and SC-FDMA allow to utilize the parallelism in the frequency domain and to manage the spectral resource with the high level of granularity. MIMO provides yet another domain, namely space. These schemes cause the radio planning process for LTE to be different from the previous standards. In this tutorial, we highlight the most important differences in the radio interface architecture, draw conclusions on how they impact the process of radio network planning and formulate a basic set of recommendations on how to deal with these differences.

To learn more about our LTE/LTE-Advanced course portfolio, please follow the link: http://is-wirelesstraining.com/trainings

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LTE Radio Network Planning Tutorial from IS-Wireless

  1. 1. LTE Radio Network Planning Tutorial
  2. 2. LTE Radio Network Design Overall Picture Title Step 1: Initial planning Step 2: Detailed planning Our scope of interest Step 3: Parameter planning Step 4: Verification and acceptance Roll-out / network optimization / extensionCopyright by Innovative Solutions. All rights reserved.Copyright by IS-Wireless. All rights reserved. www.is-wireless.com
  3. 3. Tools in the Planning Process Link Level Simulator Title System settings/Environment: • System BW • Channel (CIR, CFR) • Number of Antennas • PAPR, Synchronization, Channel estimation algorithms, etc Link Level Simulator Outputs Inputs • Performance of channel coding/BER • User allocations • EVM • MCS • Performance of algorithms • MIMO operation • Visualization (Time and frequency • User/control data plots, BER curves, MCS curves: Input data System settings throughput vs SNIR) Example: Frequency response Channel coding/modulation Output. Provides the possibility to adjust/evaluate: Radio Channel - algorithms of sync, channel estimation, - application in various channel conditions, - RF emission, filtering Sync/Estim Output. Channel decoding Output.Copyright by Innovative Solutions. All rights reserved.Copyright by IS-Wireless. All rights reserved. www.is-wireless.com
  4. 4. Tools in the Planning Process RNP Tool Title System settings/Environment: • Chosen and tuned propagation models • Chosen and tuned traffic models • Geographical data – digital map (elevation, land usage, …) Inputs Outputs • Site locations and configuration RNP Tool • Coverage (field strength, Rx power level, • Antenna models (patterns) best server) • Available frequencies and BWs • Capacity (interference, SNIR, data rates) • Spectrum reuse method • Visualization (coverage/capacity maps, • MCS mapping (from Link Level) statistics) Example: SINR map Map Network parameters Pathloss Output. Rx_Lev Output. Usually Static Simulations Provides the possibility to adjust/evaluate: Best server Output. - Site locations, powers, spectrum reuse methods, frequency planning, C/I Output. - parameter configuration. MCS Bit/rates Output. mappingCopyright by Innovative Solutions. All rights reserved.Copyright by IS-Wireless. All rights reserved. www.is-wireless.com
  5. 5. Tools in the Planning Process System Level Simulator Title System settings/Environment: • System BW • System parameters configuration (CellIDs, frequencies) • Channel, traffic, user distribution models, etc Inputs Outputs • Coverage (from RNP tool) System Level Simulator • Utilization of resources • Capacity (from RNP tool) • Dynamic/Semi-static • Site location (from RNP tool) coverage/SNIR/Bitrates • QoS • Blocked users • User positions • Visualization (SNIR/Spectral • RRM algorithms efficiency, resource utilization) • Mobility performance Traffic demands/QoS Input from RNP Example: Spectral efficiency UE position Position adjustment Random fading RRM alg. Usually Dynamic Simulations Provides the possibility to adjust/evaluate: Conn. Est. - different RRM algorithms, - power control algorithms - traffic shaping methods, Power/datarate Output. - interference management schemes - fade margins, UE power margins Interference Output.Copyright by Innovative Solutions. All rights reserved.Copyright by IS-Wireless. All rights reserved. www.is-wireless.com
  6. 6. E-UTRA Radio Frame Downlink Title 1 Radio Frame (10 ms) PBCH – 4 OFDM symbols (0-3) PDSCH – rest REs 1 subframe (1 ms) 1 slot (0.5 ms) in slot 1 in subframe 0 OFDM Symbol 7 OFDM Symbols 2 PRB 12 SC 72 62BW SCs SCs DC RE RS OFDM Subcarrier Guard Band for P-SS and S-SS Control Region: First 1-3 OFDM Symbols in subframe Synchronization Signal: PCFICH – OFDM symbol 0, 2 OFDM symbols (5-6) in slot 0 and 10 PHICH – OFDM symbol 0 P-SS – OFDM symbol 6 in slot 0 and 10 PDCCH – the rest S-SS – OFDM symbol 5 in slot 0 and 10Copyright by Innovative Solutions. All rights reserved.Copyright by IS-Wireless. All rights reserved. www.is-wireless.com
  7. 7. E-UTRA Resource Allocation Title OFDMA/SCFDMA Combined with TDMA f Pt BW R1 R2 R3 12x15kHz TTI=1ms tCopyright by Innovative Solutions. All rights reserved.Copyright by IS-Wireless. All rights reserved. www.is-wireless.com
  8. 8. LTE Link Budget General Rules Title EIRP N+I SNIR Pt Pr TX RX P_sens GAINS, LOSSES, MARGINS Link budget Pr = Pt + GAINS - LOSSES - MARGINS Question: what is the cell edge criterion? Distance d - Max throughput at the cell edge - Basic connectivity (i.e., lowest possible MCS) - Ref RX sensitivity requirement SNIR_minCopyright by Innovative Solutions. All rights reserved.Copyright by IS-Wireless. All rights reserved. www.is-wireless.com
  9. 9. LTE Link Budget Example Link Budget in Downlink Title Parameter Value Comment A Max eNB TX power 46 dBm B Cable loss 3 dB C CP loss 1 dB eNB TX D eNB antenna gain max 19 dBi E EIRP max 61 dBm =A–B–C+D BW_RX 1.8 MHz F Noise power -102 dBm G SNIR_min 5 dB From MCS tables UE RX H UE antenna gain 0 dBi I Min required RX power -97 dBm =F+G-H J total path loss 158 dBm =E–I K Other gains, losses, margins - 10 dB Shadowing, fast fading, multiantenna L Maximum Allowed Propagation Loss 148 dBm =J+K Cell range 3.5 kmCopyright by Innovative Solutions. All rights reserved.Copyright by IS-Wireless. All rights reserved. www.is-wireless.com
  10. 10. LTE Coverage Title Site Coverage Area and Inter-Site Distance After determiation of cell range (radius) d we can estimate the site coverage area * Omni 2-sectors 3-sectors Site_area 2.6 * d2 1.3 * d2 1.95 * d2 Intersite_distance 0.87 * d 2* d 1.5 * d #sites = deployment_area / site_area GRID to be entered into the RF Planning tool for verification * Source: J. Laiho, A. Wacker, T. Novosad, „Radio Network Planning and Optimization for UMTS”, Wiley, 2002, pp 83Copyright by Innovative Solutions. All rights reserved.Copyright by IS-Wireless. All rights reserved. www.is-wireless.com
  11. 11. Title Backup slidesCopyright by Innovative Solutions. All rights reserved.Copyright by IS-Wireless. All rights reserved. www.is-wireless.com
  12. 12. LTE/LTE-Advanced course portfolio List of IS-Wireless’ courses Title Contact Us: Email: info@is-wireless.com www.is-wireless.comCopyright by Innovative Solutions. All rights reserved.Copyright by IS-Wireless. All rights reserved. www.is-wireless.com

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