When we talk about GSM Rf planning then first thing into mind is Link Budget,here i write about why link Budget analysis in GSM
Link budget analysis provides:
- Coverage design thresholds
- EIRP needed to balance the path
- Maximum allowable path loss
- It is important that the uplink and downlink paths be balanced, otherwise not enough signal will survive the transmission process to achieve the required signal to noise ratio (SNR) or the bit-error-rate (BER).
- Path imbalance results from the facts that the gains and losses in the uplink and downlink paths are not the same.
- The calculations have to be done separately on the uplink and the downlink.
The RF Path
INPUTS
- Base station and Mobile receiver Sensitivity Parameters
- Minimum acceptable Signal to Noise ratio
- Environmental / Thermal Noise
- Receiver Noise figure
- Antenna gain at the base station and mobile station.
- Hardware Losses (Cable , Connectors, Combiners, Duplexers etc)
- Target Coverage reliability.
- Fade margins.
OUTPUTS
- Base station ERP
- Maximum allowable path loss
- Cell size estimates
- Cell count estimates