UCI Transmission on Unlicensed Spectrum via Segmentation
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Solution Overview
Problem
In current NR systems, when transmitting UCI on multiple unlicensed BWPs, the challenge arises in ensuring effective transmission of piggybacked UCI when PUSCH is only sent on sub-bands that pass LBT, leading to potential performance degradation.
Innovation Solution
The method involves splitting UCI into a first control information block for repeated transmission and a second control information block, where the first block indicates the sub-band occupied by the second block, allowing for enhanced transmission performance without excessive payload increase, and selecting the best-performing sub-band based on LBT results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UCI is piggybacked on PUSCH for transmission, then uplink transmitting power is guaranteed and PAPR is not increased, but UCI transmission performance degrades when PUSCH is only transmitted on sub-bands that pass LBT
Solution Approach 1:
The patent segments UCI into two separate blocks: a first control information block transmitted repeatedly across multiple sub-bands, and a second control information block transmitted once on a selected sub-band. This segmentation allows critical UCI to be transmitted even when PUSCH transmission is restricted to only some sub-bands, resolving the contradiction between reliability and power utilization.
Solution Approach 2:
The patent performs preliminary channel listening on all K sub-bands before transmission to identify which sub-bands are idle. Based on this preliminary information, the system selects optimal sub-bands for transmitting the second control information block and determines repetition patterns for the first block, ensuring reliable UCI delivery while adapting to actual channel conditions.
2Reliability
If UCI transmission follows PUSCH transmission mode (transmitted only on sub-bands that pass LBT), then implementation is simple, but UCI transmission performance is negatively impacted
Solution Approach 1:
By dividing UCI into two blocks with different transmission strategies, the patent achieves improved reliability without requiring complete redesign of the transmission mechanism. The first block uses simple repetition while the second block uses selective transmission, balancing complexity and performance.
Solution Approach 2:
The patent changes transmission parameters dynamically based on LBT results: the number of repetitions for the first control information block is adjusted according to the number of idle sub-bands, and the sub-band selection for the second block is determined by channel conditions. This allows adaptive optimization without complex reconfiguration.
3Reliability
If UCI is split into multiple blocks with repeated transmission, then transmission robustness is improved, but UCI payload increases
Solution Approach 1:
The patent segments UCI into two blocks with different redundancy levels: the first block contains critical information transmitted repeatedly for robustness, while the second block contains additional information transmitted once to avoid excessive payload increase. This selective segmentation optimizes the balance between reliability and payload size.
Solution Approach 2:
Different parts of the UCI are treated differently: the first control information block is designed for high reliability through repetition on sub-bands that passed LBT, while the second block is transmitted once on a selected sub-band. This local differentiation ensures critical information is protected without unnecessarily increasing overall payload.
Data Source
AI summary
A method and a device for use in wireless communication nodes are disclosed in the present disclosure. A first node firstly performs channel listening to determine that K1 sub-bands out of K sub-bands are idle; and then transmits a first control information block and a second control information block on a first channel; the first channel occupies the K1 sub-bands of the K sub-bands; K1 repetitions of the first control information block are respectively transmitted by the K1 sub-bands, while the second control information block is transmitted only once on the first channel; the first control information block is used to indicate a sub-band occupied by the second control information block. The present disclosure categorizes UCI and transmits in different ways, so that different groups of UCI can be mutually indicated, thus enhancing the uplink transmission efficiency and performance on Unlicensed Spectrum.