Uplink Control Information Transmission Power Determination
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Solution Overview
Problem
In wireless communication systems, particularly in OFDMA and MIMO technologies, efficiently transmitting uplink control information, such as periodic CSI and ACK/NACK, in the same subframe poses challenges due to the need for accurate power determination to ensure reliable transmission.
Innovation Solution
The method involves determining transmission power based on the number of bits for periodic CSI and ACK/NACK, using specific power control equations that account for the PUCCH format-dependent values, allowing for reliable joint transmission of these control information types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If periodic CSI and ACK/NACK are simultaneously transmitted in the same subframe, then the uplink control information transmission capacity is improved, but the transmission power determination becomes complex and reliability decreases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the PUCCH format based on the number of bits to be transmitted. When periodic CSI and ACK/NACK are simultaneously transmitted, the system selects PUCCH format 2, 2a, or 2b depending on whether SR is also transmitted and the bit length requirements. This parameter adaptation ensures reliable transmission by matching the control channel format to the specific transmission scenario, resolving the contradiction between transmission capacity and reliability.
2Productivity
If PUCCH format is selected based on transmission content, then transmission efficiency is improved, but the complexity of power determination increases
Solution Approach 1:
The patent implements dynamics by making the PUCCH format selection adaptive rather than static. The format is dynamically chosen based on real-time transmission requirements: format 2 for CSI-only, format 2a for CSI+ACK/NACK without SR, and format 2b for CSI+ACK/NACK with SR. This dynamic adaptation allows the system to optimize transmission efficiency for each scenario while managing complexity through standardized format definitions.
Solution Approach 2:
The patent applies segmentation by dividing the uplink control information transmission into distinct format categories. Each PUCCH format (2, 2a, 2b) is designed for specific combinations of control information types, creating segmented transmission paths. This segmentation simplifies power determination by providing clear rules for each segment, reducing the overall complexity despite supporting multiple transmission scenarios.
3Adaptability or versatility
If multiple types of uplink control information are multiplexed, then resource utilization is improved, but the accuracy of power control decreases
Solution Approach 1:
The patent applies local quality by providing different power control treatments for different types of uplink control information within the same transmission. When multiple UCI types are multiplexed, the system calculates power adjustments specific to each format type (2, 2a, 2b) based on their respective bit lengths and transmission requirements. This localized power control approach maintains accuracy by tailoring the power determination to the specific multiplexing scenario rather than using a generic method.
Data Source
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AI summary
The present invention relates to a method at a base station relating to receiving at least one type of uplink control information (UCI) in a physical uplink control channel (PUCCH) format 3, wherein transmission power of the PUCCH format 3 is based on a PUCCH format dependent value, the at least one type of UCI includes acknowledgement/not-acknowledgement (ACK/NACK) information, or, ACK/NACK information and scheduling request (SR) information, and the at least one type of UCI does not include periodic channel state information (CSI) information.