PUCCH Power Control Using PRACH Ramp-Up to Prevent Uplink Congestion
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Solution Overview
Problem
When a base station configures a power configuration field corresponding to the PUCCH in an RRC setup message, the power ramp-up during random access is reset to 0, causing a steep decrease in transmit power, leading to sending failures on the PUCCH and congestion in uplink data transmission.
Innovation Solution
The PRACH transmit power ramp-up is adjusted based on the PRACH transmit power ramp-up and/or the value of the power configuration field to determine a target power adjustment value for the PUCCH, using predefined thresholds and formulas to maintain stable transmit power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the base station configures a power configuration field corresponding to the PUCCH in an RRC setup message, then the transmit power control is standardized and simplified, but the PUCCH transmit power decreases steeply causing sending failures and congestion
Solution Approach 1:
The UE performs preliminary calculation of the power adjustment value before the PUCCH transmission. By pre-calculating the power adjustment based on the power ramp-up during random access and the power configuration field, the UE ensures that the PUCCH transmit power is adequately set before actual transmission, preventing power deficiency and transmission failures
Solution Approach 2:
The patent changes the parameter used for PUCCH transmit power calculation by introducing a power adjustment value that combines the power ramp-up from random access and the power configuration field. This parameter change ensures that the transmit power reflects both the random access history and the configured power levels, preventing steep power decreases
2Device complexity
If the power ramp-up during random access is reset to 0, then the power configuration is simplified, but the PUCCH transmit power decreases causing uplink congestion and system disconnection
Solution Approach 1:
The patent merges the power ramp-up information from random access with the power configuration field in a unified power adjustment value. By combining these two parameters, the system maintains the simplicity of power control while ensuring that the PUCCH transmit power reflects both the random access history and configured levels, preventing uplink congestion
Solution Approach 2:
The patent uses the power ramp-up information as feedback to adjust the PUCCH transmit power. The power ramp-up during random access serves as feedback about the actual transmission conditions, which is then used to calculate an appropriate power adjustment value for subsequent PUCCH transmissions, preventing power deficiency and congestion
Data Source
AI summary
This application provides a method and an apparatus for controlling transmit power of a PUCCH, and a user equipment. The method includes: obtaining a PRACH transmit power ramp-up when random access between the user equipment and a base station succeeds; adjusting, when a radio resource control setup message sent by the base station includes a power configuration field corresponding to the PUCCH, the PRACH transmit power ramp-up based on the PRACH transmit power ramp-up and/or a value of the power configuration field; determining, based on an adjusted PRACH transmit power ramp-up, a power adjustment value of the PUCCH; and determining, based on a preset PUCCH transmit power calculation formula, the value of the power configuration field, and the power adjustment value, target transmit power of the PUCCH. In this way, the power adjustment value of the PUCCH is flexibly adjusted, so that congestion in uplink data transmission is avoided.