How to improve LTE throughput through PA PB and RS power?

4G LTE
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1

Dear All.

How to improve LTE throughput through PA PB and RS power?

Understanding PA and PB
Understanding PA and PB1080×847 64.3 KB

2

You can reduce RS power to increase PA and PB but you will reduce the coverage.

1 Like
3

What are the parameters as Pa,Pb in Ericsson to control the power under the site ?

4

'You Can Keep Pa and Pb=0 and RS Power Depend on You Hardware like 212 or 182.

So You can get better power for PDSCH.

5

Adjusting PA and PB values can significantly impact 4G throughput

Understanding PA and PB

  • PA (Power Allocation): Controls the power offset between reference signals and PDSCH (Physical Downlink Shared Channel) symbols without reference signals. A negative PA value means less power is allocated to PDSCH symbols.
  • PB (Power Boosting): Determines the power offset between PDSCH symbols with and without reference signals. A higher PB value means more power is allocated to PDSCH symbols without reference signals.

Optimizing PA and PB for Better Throughput

  • Recommended Settings: Setting PA to -3 and PB to 1 can optimize performance and improve throughput. This configuration allows for efficient power distribution between control and data channels.
  • RRU Utilization: If the Remote Radio Unit (RRU) is underutilized, increasing PA without changing RS power can improve throughput. However, if the RRU is fully utilized, increasing RS power may negatively impact throughput.
  • Coverage and Throughput Trade-off: Reducing RS power can increase PA and PB, improving throughput, but may reduce coverage. Increasing RS power can extend coverage but may decrease throughput if the RRU is fully utilized.

Best Practices

  • Monitor RRU Power: Ensure the RRU supports the configured power settings to avoid site downtime.
  • Adjust Based on Network Conditions: Optimize PA and PB settings based on specific network conditions, such as frequency band and hardware capabilities.
  • Test and Validate: Use tools like the PDSCH Power Config Tool to calculate optimal settings and validate performance ² ³.

Some optimal PA and PB configurations include:

  • (PA, PB) = (0, 0)
  • (PA, PB) = (-3, 1)
  • (PA, PB) = (-4.77, 2)
  • (PA, PB) = (-6, 3)

Keep in mind that the ideal settings may vary depending on your specific network configuration and requirements.

Understanding PA and PB
Understanding PA and PB1080×847 64.3 KB

LinkedIn: :point_down:

6

How RS Power calculated? as Default value 18.2dBm kept ,(RRU Power is 120W per 1T, so 480W total RRU power for 4T4R) then Pa can increase which impact throughput?