PUCCH Format 3 Power Control Parameter Determination in TDD Systems
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Solution Overview
Problem
In LTE-A systems, there is no effective method for determining the power control parameter n HARQ for PUCCH format 3 transmission, especially in TDD systems, which hinders efficient power control and accurate transmission of ACK/NACK response information.
Innovation Solution
A PUCCH power control method where the UE determines n HARQ by summing the number of received PDSCHs with corresponding PDCCHs, SPS subframes, and DCI indicating SPS release, and uses dual RM encoding for PUCCH format 3 transmission, mapping ACK/NACK response information into bit sequences for efficient power control and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If PUCCH format 3 transmission is employed in LTE-A systems, then the capacity to transmit ACK/NACK response information is improved, but the method for determining power control parameter n HARQ becomes complex and unavailable especially in TDD systems
Solution Approach 1:
The patent defines specific calculation methods for power control parameters (n HARQ , n CQI , n SR ) based on different PUCCH formats and transmission scenarios. By establishing clear parameter calculation rules for PUCCH format 3, the patent resolves the complexity issue while maintaining enhanced information capacity.
Solution Approach 2:
The patent segments the power control parameter determination into distinct components: n HARQ for HARQ-ACK information, n CQI for channel quality indicator, and n SR for scheduling request. This segmentation allows independent calculation and management of each parameter, simplifying the overall power control mechanism for PUCCH format 3.
2Reliability
If dual RM encoding scheme is used for PUCCH format 3, then the transmission reliability of response information is improved, but the encoding complexity increases
Solution Approach 1:
The patent implements dynamic selection between single RM encoding and dual RM encoding schemes based on the number of ACK/NACK bits and configuration parameters. When the number of bits exceeds a threshold or specific conditions are met, dual RM encoding is activated to enhance reliability, otherwise single RM encoding is used to reduce complexity.
Solution Approach 2:
The patent performs preliminary determination of the encoding scheme based on pre-defined criteria (number of ACK/NACK bits, PUCCH format configuration) before actual transmission. This preliminary action allows the system to prepare the appropriate encoding method in advance, avoiding real-time complexity while ensuring reliability when needed.
Data Source
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AI summary
The disclosure provides a physical uplink control channel (PUCCH) power control method. A user equipment (UE) determines a power control parameter nHARQ for a PUCCH format 3 transmission and performs power control on the PUCCH format 3 based on the nHARQ. The disclosure also provides a PUCCH power control apparatus. According to the disclosure, for a TDD system, the power control parameter nHARQ for the PUCCH format 3 transmission may be determined, which efficiently solves the problem regarding power control when feedback is performed in PUCCH format 3.