What are main parameters involved in Uplink power control for PUSCH and PUCCH in LTE eNodeB?

4G LTE
1

Hi All.

What are main parameters involved in Uplink power control for PUSCH and PUCCH in LTE eNodeB?

Vendor is Huawei.

2

Better check in Hedex, complete parameters there, with explanation.

3

Thanks. But I don’t have access to it.

I do have a dump.

And I need to understand which parameter defines the target Uplink power for UE.

4

Physical Uplink Shared Channel (PUSCH) and Physical Uplink Control Channel (PUCCH) in LTE eNodeB (Evolved Node B) include:

  1. Target Received Power (P0): This parameter represents the target power level at the eNodeB receiver for a reference channel quality. It is the power level at which the mobile device should ideally transmit to achieve the desired signal quality at the eNodeB. The eNodeB uses this parameter to set the initial power level for a UE (User Equipment).
  2. Path Loss Compensation (alpha): This parameter is used to compensate for the path loss between the mobile device and the eNodeB. It is applied to adjust the power level based on the distance between the UE and the eNodeB.
  3. Open Loop Power Control (OLPC): OLPC adjusts the UE’s transmit power based on the received signal strength at the eNodeB without explicit feedback from the eNodeB to the UE. The UE adjusts its power level based on the downlink reference signal received power (RSRP).
  4. Closed Loop Power Control (CLPC): CLPC involves feedback from the eNodeB to the UE regarding the quality of the received signal. The UE adjusts its transmit power based on this feedback to maintain a desired signal-to-interference-plus-noise ratio (SINR) or signal-to-noise ratio (SNR).
  5. Power Control Adjustment Step (delta_PUCCH): This parameter defines the step size used to adjust the transmission power for PUCCH. It is the increment or decrement in dB applied to the power control commands sent by the eNodeB to the UE.
  6. Power Control Range (PCMAX and PCMIN): These parameters define the maximum and minimum allowable transmit power levels for the UE. The UE’s transmit power is constrained within this range to avoid excessive interference or inadequate signal quality.
  7. SINR-to-Tx Power Mapping (PCFICH, PHICH, PUSCH, PUCCH): These parameters define the mapping between the target SINR (Signal-to-Interference-plus-Noise Ratio) and the corresponding transmit power for various channels (e.g., PCFICH, PHICH, PUSCH, PUCCH).

And the Uplink power control parameters are shared within below:

  1. Open Loop Power Control (OLPC):
  • In OLPC, the UE autonomously adjusts its transmit power based on the received signal strength at the eNodeB.
  • The UE continually monitors the downlink reference signal received power (RSRP) and adapts its transmit power level without explicit feedback from the eNodeB.
  1. Closed Loop Power Control (CLPC):
  • CLPC involves feedback from the eNodeB to the UE regarding the quality of the received uplink signal.
  • The eNodeB calculates power control commands based on measurements of the uplink channel quality, typically represented by the received Signal-to-Interference-plus-Noise Ratio (SINR) or Signal-to-Noise Ratio (SNR).
  • The UE adjusts its transmit power level in response to the power control commands to maintain the desired quality.
  1. Target Received Power (P0):
  • P0 is the target power level at the eNodeB receiver for a reference channel quality.
  • It represents the power level at which the UE should ideally transmit to achieve the desired signal quality at the eNodeB.
  • P0 is configured by the network operator during network planning and optimization.
  1. Path Loss Compensation (alpha):
  • Alpha is used to compensate for the path loss between the UE and the eNodeB.
  • It adjusts the UE’s transmit power based on the estimated path loss to equalize the received power at the eNodeB.
  1. Power Control Commands (TPC):
  • TPC commands are sent by the eNodeB to the UE to instruct it to increase, decrease, or maintain its transmit power level.
  • TPC commands are typically conveyed through dedicated control channels, such as the Physical Uplink Control Channel (PUCCH) or Physical Uplink Shared Channel (PUSCH).
  1. Power Control Step Size (delta_PUCCH, delta_PUSCH):
  • These parameters define the step size by which the UE adjusts its transmit power in response to power control commands.
  • The step size determines the granularity of power adjustments made by the UE.
  1. Power Control Ranges (PCMAX and PCMIN):
  • PCMAX and PCMIN specify the maximum and minimum allowable transmit power levels for the UE.
  • The UE’s transmit power is constrained within this range to prevent excessive interference or inadequate signal quality.
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