RF Guidelines 900 - RF GUIDELINES, GSM 900 CME 20 R5...

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LV/R-96:269 Rev B 1996-09-06 1(27) RF GUIDELINES, GSM 900 CME 20 R5 Ericsson Radio Systems AB 1996 The contents of this product are subject to revision without notice due to continued progress in methodology, design and manufacturing. Ericsson assumes no legal responsibility for any error or damage resulting from usage of this product.
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CME 20 R5 2(27) LV/R-96:269 Rev B 1996-09-06
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RF GUIDELINES, GSM 900 CME 20 R5 LV/R-96:269 Rev B 1996-09-06 3(27) Contents 1 Revision history. .............................................................. 5 2 Introduction. ..................................................................... 5 3 Site equipment parameters. ............................................. 5 3.1 Nominal or worst case values . ........................................................... 5 3.2 BTS output power. ............................................................................ 6 3.3 Sensitivity. ........................................................................................ 8 3.4 Micro base station. ........................................................................... 8 3.5 Mobile station. .................................................................................. 8 3.6 Antenna near part. ............................................................................ 9 3.7 Repeaters. ..................................................................................... 13 3.8 Configurations . ............................................................................... 13 4 Cell coverage. ................................................................. 15 4.1 Wave propagation models for estimation. ......................................... 15 4.2 Minimum required signal strength. .................................................... 16 4.3 Fading Conditions. .......................................................................... 16 4.4 Interference Margin . ....................................................................... 18 4.5 Indoor coverage . ............................................................................ 19 4.6 In-car coverage. ............................................................................. 20 4.7 Interference levels . ......................................................................... 20 5 Cell planning. ................................................................. 23 5.1 Power budget. ................................................................................ 23 5.2 Power balance . .............................................................................. 24 5.3 Summary of coverage requirements. ................................................ 25 5.4 Cell size. ........................................................................................ 25 6 References. ..................................................................... 27 Appendix: 1. Curves of Jakes formula, Cumulative normal function 2. Simulated log-normal fading margins 3. Quick reference - cell planning CME 20, GSM 900 4. Example of RF-budget for 2 W MS, urban areas and typical case 5. Example of RF-budget for 2 W MS, rural areas and typical case
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CME 20 R5 4(27) LV/R-96:269 Rev B 1996-09-06
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RF GUIDELINES, GSM 900 CME 20 R5 LV/R-96:269 Rev B 1996-09-06 5(27) 1 Revision history Rev Date Description A 1996-06-19 Created A 1996-06-20 Minor changes B 1996-09-06 A number of minor changes 2 Introduction This document contains information about site equipment and cell planning policy for CME 20, GSM 900. 3 Site equipment parameters The GSM 900 system is required to operate in the following frequency band, with a carrier spacing of 200 kHz: Table 1. Frequency band of GSM 900. MS transmit, Base receive 890 - 915 MHz Base transmit, MS receive 935 - 960 MHz 3.1 Nominal or worst case values Discussions on the link budget have a tendency to focus on which type of figures to use; worst or nominal case. However, the following is a practical way to deal with this problem. Nominal values By nominal value is meant the expected value. For cell planning purposes nominal values are preferred, as the result will be more close to reality than with worst case values. Cell planning tools calculate the cell range expressed as a probability to reach an MS at the cell border. Using nominal values in the link budget will result in a variation around this probability figure among the different cells. For the total network however, the desired probability is achieved. However, the variation is not necessarily stochastic. That means, the mean performance is not guaranteed for a limited delivery of base stations.
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CME 20 R5 6(27) LV/R-96:269 Rev B 1996-09-06 Guaranteed values, worst case Dimensioning a system with guaranteed values will of course give a higher coverage probability at the cell border, but the network will be better than planned and consequently more costly. Guaranteed value means that under all circumstances, individual variation, temperature range, power supply levels, aging, etc. a unit will show at least guaranteed figures.
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This note was uploaded on 08/08/2011 for the course CS 310 taught by Professor Aartisingh during the Spring '11 term at National Institute of Technology, Calicut.

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RF Guidelines 900 - RF GUIDELINES, GSM 900 CME 20 R5...

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