Uplink Control Information Payload Management in 5G xPUCCH
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face challenges in efficiently managing uplink control information (UCI) payload sizes, which can exceed the maximum allowable payload size supported by physical uplink control channel (PUCCH) formats, leading to potential data loss and inefficient resource allocation.
Innovation Solution
The proposed solution involves a dropping rule for UCI, a scheduling request (SR) transmission scheme, enhancement of beam refinement reference signal (BRRS) scheduling, and the use of new downlink control information (DCI) formats to request CSI and beam-related information, ensuring proper alignment and prioritization of UCI components based on payload size and network requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the UCI payload size is increased to include more control information, then the completeness of control information is improved, but the PUCCH format capacity is exceeded leading to data loss
Solution Approach 1:
The UCI payload is segmented into multiple parts based on priority levels. High-priority information (such as HARQ-ACK) is transmitted first, followed by medium-priority (CSI), and then low-priority (beam-related information) information. This segmentation allows the system to fit the UCI payload within PUCCH format capacity while maintaining transmission of critical control information.
Solution Approach 2:
Different portions of the UCI payload are assigned different priority levels and transmission qualities. Critical information receives higher priority and is protected from dropping, while less critical information can be dropped when capacity is exceeded. This local quality differentiation ensures that the most important control information is always transmitted reliably.
2Loss of information
If all UCI information is transmitted without prioritization, then the information completeness is improved, but the resource allocation efficiency deteriorates
Solution Approach 1:
The system performs preliminary prioritization and classification of UCI information before transmission. By pre-establishing priority rules and categorizing information (HARQ-ACK, CSI, beam-related), the system prepares the payload structure in advance, enabling efficient resource allocation and avoiding the need for complex real-time decisions during transmission.
Solution Approach 2:
The system dynamically adjusts transmission parameters based on the prioritized UCI payload structure. When the total payload exceeds PUCCH capacity, the system changes the transmission parameter by selectively dropping lower-priority information while maintaining higher-priority information, thereby optimizing resource utilization while preserving essential control data.
3Quantity of substance
If the PUCCH payload capacity is increased to accommodate larger UCI payloads, then the UCI transmission capability is improved, but the device complexity increases
Solution Approach 1:
Instead of increasing fixed PUCCH payload capacity, the system dynamically adapts the effective payload size through prioritization-based dropping rules. The PUCCH format remains standardized with fixed capacity, but the actual transmitted payload dynamically adjusts based on priority levels and capacity availability, avoiding the need for multiple complex PUCCH formats.
Solution Approach 2:
The standardized PUCCH format serves multiple functions by accommodating different priority levels of UCI information within its fixed capacity. Rather than creating specialized PUCCH formats for different payload sizes, the universal PUCCH format with prioritization rules handles various UCI composition scenarios, reducing overall system complexity.
Data Source
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AI summary
A physical uplink control channel format is determined based on a determined uplink control information (UCI) payload size. Enhancement of uplink control channel on a 5G physical uplink control channel (xPUCCH) based on UCI payload size can be accomplished by (1) a dropping rule if UCI payload size exceeds the maximum allowable payload size supported by xPUCCH format; (2) a scheduling request (SR) transmission scheme when combined with other UCI information; (3) enhancement on beam refinement reference signal (BRRS) scheduling; and (4) downlink control information (DCI) requests for the transmission of channel state information (CSI) report and beam related information by itself.