Uplink Control Information Transmission in Wireless Systems
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, there is a challenge in efficiently reporting channel state information (CSI) without causing collisions with ACK/NACK information, leading to decoding failures and increased overhead due to the limited capacity of PUCCH formats like PUCCH format 3.
Innovation Solution
The method involves transmitting CSI and ACK/NACK information together using PUCCH format 3, with a 1-bit ANE indicator to distinguish their presence, and applying bundling patterns to adjust payload size, ensuring CSI is only transmitted if there is sufficient remaining capacity, and using existing codebooks to manage payload constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSI and ACK/NACK information are transmitted separately using different PUCCH formats, then decoding reliability is maintained, but uplink control overhead increases and resource efficiency decreases
Solution Approach 1:
The patent combines CSI and ACK/NACK information into a single PUCCH format 3 transmission. The ACK/NACK information is mapped to first resource elements while CSI is mapped to second resource elements within the same PUCCH resource, allowing both information types to be transmitted together without requiring separate PUCCH formats, thereby reducing uplink control overhead while maintaining decoding reliability through proper resource element allocation and signaling.
2Productivity
If PUCCH format 3 capacity is increased to accommodate both CSI and ACK/NACK, then reporting efficiency improves, but payload size constraints are violated and decoding failures occur
Solution Approach 1:
The patent changes the parameter of resource element allocation by introducing a 1-bit indicator that signals whether ACK/NACK information is present. Based on this indicator, the base station can correctly interpret the payload structure: when the indicator shows ACK/NACK is present, the payload is interpreted as containing both ACK/NACK and CSI; when absent, only CSI is present. This allows efficient use of PUCCH format 3 capacity without violating payload size constraints.
3Adaptability or versatility
If a 1-bit indicator is added to distinguish ACK/NACK presence, then payload differentiation becomes possible, but the indicator itself consumes payload capacity
Solution Approach 1:
The patent implements self-service by making the 1-bit indicator part of the existing PUCCH format 3 structure, where the indicator bit is embedded within the payload itself. The base station uses this self-contained indicator to automatically determine how to interpret the remaining payload bits, eliminating the need for additional signaling resources or separate indication channels. This approach provides payload differentiation capability while minimizing the impact on available payload capacity.
Data Source
AI summary
Disclosed in the present application is a method for transmitting, by a terminal, uplink control information to a base station in a wireless communication system. In detail, the method includes the steps of: periodically transmitting, to a base station, first uplink control information including channel status information; and transmitting, to the base station, second unlink control information including response information to downlink data, wherein when the first uplink control information and the second uplink control information are transmitted at the same time, the channel status information is characterized in being included in the second uplink control information and the first uplink control information and the second uplink control information are characterized in being transmitted together with a first indicator for indicating whether the response information is included.