Compared RF performance of 1.4 MHz-LTE and EVDO rev. A in rural environments at 450 MHztation
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Transcript of Compared RF performance of 1.4 MHz-LTE and EVDO rev. A in rural environments at 450 MHztation
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Compared RF performance of 1.4 MHz-LTE and EVDO rev. A
in rural environments at 450 MHz
Renny E. Badra Universidad Simn Bolvar
Caracas, Venezuela
at 2013 IEEE Vehicular Technology Conference -Fall
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This talk Motivation Methodology Baseline Performance Data Antenna Considerations Monte Carlo Simulations Results Conclusions
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Motivation Focus: wireless data access in rural environments Availability of wireless spectrum in the 450 MHz
o Excelent propagation conditions reduces the number of cells
Increased demand for and adoption of broadband cellular services (3G and 4G) o Long-Term Evolution (LTE) is widely acknowledged to be the fastest and most
efficient cellular technology that is commercially available today
o BUT: relatively narrow spectrum in the 450 MHz band (5 MHz or less) will force operators to implement the 3-MHz and/or 1.4-MHz versions of LTE
A key question pops up: how do these less efficient versions of LTE compare to already deployed and well-known 3G CDMA technologies such as EVDO (CDMA Evolution Data-Optimized) revision A?
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Methodology Work aimed at evaluating the RF performance of 1.4-
MHz LTE and EVDO rev A via numerical simulations o Two performance measures are considered: aggregated cell throughput
(spectral efficiency) and cell coverage
o Both links considered for stationary users
Same conditions applied to both technologies in order to make comparison fair.
Two cell planning scenarios are considered: isolated cells and fully embedded cells.
Simulation methodology based on: o collecting previously validated baseline performance data (bit rates vs.
SNR) for each technology, as reported in the literature
o using it in Monte Carlo simulations along with suitable propagation models
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Baseline Performance DataEV-DO rev. A Downlink
- 3GPP2, Recommended Minimum Performance Standards for cdma2000 High Rate Packet Data Access Terminal, C.S0033-D, v 1.0, April 2012.
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Baseline Performance Data1.4-MHz LTE Downlink Overhead
(not including signaling)
- H. Holma and A. Toskala, editors. LTE for UMTS OFDMA and SC-FDMA Based Radio Access. Wiley and Sons Ltd. UK. 2009.
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Baseline Performance Data1.4-MHz LTE Downlink
- Wei, Na et. al., LTE Capacity Compared to the Shannon Bound, in Vehicular Technology Conference, 2007. VTC2007-Spring. IEEE 65th. April 2007. pp. 1234 1238.- Dahman, E. et. al., The 3G Long-Term Evolution - Radio Interface Concepts and Performance Evaluation, in Vehicular Technology Conference, 2006. VTC 2006-Spring. IEEE 63rd. May 2006. pp. 137-141.- H. Holma and A. Toskala, editors. LTE for UMTS OFDMA and SC-FDMA Based Radio Access. Wiley and Sons Ltd. UK. 2009. - Zhang, L. Network Capacity, Coverage Estimation and Frequency Planning of 3GPP Long Term Evolution. Master thesis in Automatic Control at Linkpings Institute of Technology. Sweeden. 2006.
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Baseline Performance DataEV-DO rev. A Uplink
- 3GPP2, Recommended Minimum Performance Standards for cdma2000 High Rate Packet Data Access Network, C.S0032-D, v 1.0, April 2012.
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Baseline Performance Data1.4-MHz LTE Uplink Overhead
(not including signaling)
H. Holma and A. Toskala, editors. LTE for UMTS OFDMA and SC-FDMA Based Radio Access. Wiley and Sons Ltd. UK. 2009.
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Baseline Performance Data1.4-MHz LTE Uplink
- Wei, Na et. al., LTE Capacity Compared to the Shannon Bound, in Vehicular Technology Conference, 2007. VTC2007-Spring. IEEE 65th. April 2007. pp. 1234 1238.- Dahman, E. et. al., The 3G Long-Term Evolution - Radio Interface Concepts and Performance Evaluation, in Vehicular Technology Conference, 2006. VTC 2006-Spring. IEEE 63rd. May 2006. pp. 137-141.- H. Holma and A. Toskala, editors. LTE for UMTS OFDMA and SC-FDMA Based Radio Access. Wiley and Sons Ltd. UK. 2009. - Zhang, L. Network Capacity, Coverage Estimation and Frequency Planning of 3GPP Long Term Evolution. Master thesis in Automatic Control at Linkpings Institute of Technology. Sweeden. 2006.
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Antenna Considerations For the sake of simplicity, omnidirectional cells
considered throughout this work Downlink antenna configuration is 1x1 (SISO) for
both technologies o Many EVDO rev. A terminals support a 1x2 configuration o LTE specs support full 2x2 and 4x4 MIMO configurations (optional)
Uplink antenna configuration is 1x2 for both technologies o EVDO rev. A. specs do not support multiple transmit antennas o LTE specs supports full 2x2 and 4x4 MIMO configurations (optional)
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Monte Carlo SimulationsDownlink
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Monte Carlo SimulationsUplink
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Results: downlinkMulti-cell scenario
Isolated cell scenario
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Results: uplinkMulti-cell scenario
Isolated cell scenario
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Conclusions Fair comparison between technologies turned out
to be simpler to achieve for the downlink than for the uplink o Downlink MA schemes are orthogonal within a cell for both LTE and EVDO o Uplink EVDO MA scheme is non-orthogonal within a cell
Picture that emerges from this comparison is that of two essentially comparable technologies. each showing specific strengths and weaknesses
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Conclusions However, if we place emphasis on the two most
significant performance measures (downlink throughput and uplink coverage), 1.4-MHz LTE has a visible advantage over EVDO-revA, specially in the isolated cell scenarios: o LTE advantage in downlink throughput is over 50% for isolated cells, since
fractional reuse is no longer needed. o LTE advantage in uplink coverage is 5-22% in cell area confidence for
isolated cells, since transmission can benefit from reduced OFDM spectrum occupancy.
The LTE advantage over EVDO is not overwhelming, but could become so if: o MIMO techniques are applied to LTE links (not available for EVDO) o 3-MHz LTE is deployed instead of 1.4-MHz (still could fit in some 450 MHz
bands)
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Compared RF performance of 1.4 MHz-LTE and EVDO rev. A
in rural environments at 450 MHz
Renny E. Badra Universidad Simn Bolvar
Caracas, Venezuela
at 2013 IEEE Vehicular Technology Conference -Fall