LTE-A Implementation Scenarios: RF Planning Comparison

LTE-A Implementation Scenarios: RF Planning Comparison

Mohammed Jaloun (EMI School, Morocco) and Zouhair Guennoun (EMI School, Morocco)
DOI: 10.4018/jmcmc.2012010103
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Abstract

This paper covers most aspects of LTE Radio Frequency (RF) system planning; this study has been extended to cover different implementation scenario for LTE-Advance. It explains the parameters that comprise the 4G cellular RF Link Budget and the basic propagation models in order to perform a RF Planning for LTE. Cell coverage has been estimated for different spectrum band and bandwidth and different modulation and coding schemes (MCS).
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Like any wireless system, radio frequency link budget need to be calculating for LTE to in order to estimate the coverage of the sites and ultimately determine how many sites is required (Enigmatic Consulting, 2007).

Figure 2 resumes the link budget calculation that will be followed during this paper.

Figure 2.

General radio link budget

In order to calculate the link budget, the radio path losses and the equipment output powers and sensitivities must be taken into account for both directions.

Effective Radiated Power

In radio telecommunications, Effective Radiated Power (ERP) is determined by subtracting system losses and adding system gains. ERP takes into consideration transmitter power output (TPO), transmission line attenuation (electrical resistance and RF radiation), RF connector insertion losses, and antenna directivity and is calculated as in Table 1.

Table 1.
Effective radiated power calculation
ParameterReferenceValue
Transmit RF Power, dBm2.1.1TxPowerdb
Tx Diversity Gain, dB2.1.2GTxDG
Transmitter Loss, dB2.1.3LTx_LL
Antenna gain, dBi2.1.4TxGainsdb
Effective Radiated Power, dBmTXERP = TxPower + GTxDG - LTx_LL + TxGainsdb
  • 2.1.1. Transmit RF Power: Is the power at the output of the equipment, in the downlink direction, it is associated with the eNode-B and in the Uplink direction, the transmit power is associated with the UE.

  • 2.1.2. Transmit Diversity Gain: In LTE, more than 2 antennas could be used to transmit information, this will lead to coverage improvement and the gain obtained from transmits diversity is obtained from the equation:NT is the number of transmit antennas

  • 2.1.3. Transmitter Loss: It includes all the losses between the output eNodB and the antenna such the feeder loss, filters and duplexer’s losses.

  • 2.1.4. Transmit Antenna Gain: is the Gain of transmitter antenna, it is a function of the horizontal pattern, vertical pattern, and number of elements that make up the antenna array. In our link budget we have assumed that all LTE-A deployment scenarios will have the same antenna gains of 16 dBi for the eNode-B and 0 dBi for the UE as stated in Evaluation methodology proposed for LTE-A in 3rd Generation Partnership Project (2008, pp. R1-084026).

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