Uplink Control Information Decoding in Unlicensed Band PUSCH
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Solution Overview
Problem
In wireless communication systems, especially in unlicensed bands, user equipment (UE) faces challenges in transmitting uplink control information (UCI) without an uplink grant, leading to difficulties for the base station in decoding UCI and data due to lack of resource allocation information.
Innovation Solution
The method involves generating and transmitting first UCI with information needed to decode data and second UCI, including ACK/NACK information, through a physical uplink shared channel (PUSCH), with specific mapping strategies to improve decoding performance, such as positioning UCI relative to demodulation reference signals (DMRS) and using resource allocation methods like SLIV to optimize transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE transmits uplink data without an uplink grant in unlicensed band, then transmission flexibility and resource utilization are improved, but the base station cannot properly decode the uplink data and control information due to lack of resource allocation information
Solution Approach 1:
The UE performs channel sensing and resource selection before transmission, and includes decoding information (such as resource allocation indicators, modulation and coding scheme indicators) in the transmitted data packet. This preliminary preparation enables the base station to decode the transmission without requiring prior grant allocation, resolving the contradiction between transmission flexibility and decoding reliability.
2Productivity
If UE multiplexes uplink control information with uplink data for transmission, then transmission efficiency is improved, but the base station experiences difficulty in decoding both data and control information simultaneously
Solution Approach 1:
The patent segments the multiplexed transmission into distinct logical parts: data portion and control information portion. Each segment is independently encoded and structured with its own decoding information. The base station can separately decode each segment using the provided decoding parameters, maintaining decoding accuracy while achieving transmission efficiency through multiplexing.
Solution Approach 2:
Different quality parameters are applied to different parts of the transmission. The control information portion uses more robust modulation and coding schemes with dedicated decoding information, while the data portion uses efficient coding. This local differentiation ensures both control information and data can be accurately decoded despite being transmitted together.
3Reliability
If UE includes comprehensive decoding information in first UCI, then base station can successfully decode data and control information, but the size and complexity of control information increases
Solution Approach 1:
The patent designs a universal decoding information structure that serves multiple functions: it identifies resource allocation, indicates modulation and coding schemes, and provides demultiplexing information. This multi-functional approach consolidates what would otherwise require multiple separate control messages into a single compact first UCI, achieving high decoding success rates without proportionally increasing complexity.
Data Source
AI summary
A method by which a terminal transmits uplink control information (UCI) in an unlicensed band and a device using the method are provided. The method generates data and first UCI including information necessary to decode the data, and transmits, to a base station, the data and the first UCI through a physical uplink shared channel (PUSCH) in an unlicensed band, wherein the first UCI further includes information necessary to decode the second UCI when second UCI is transmitted to the base station together with the data and the first UCI through the PUSCH.