Terminal PUCCH Repetition Using OCC for Reliable UCI Recognition
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Solution Overview
Problem
In Rel-17 NR systems, uplink control information (UCI) transmitted via the PUCCH may not be recognized properly by the network due to inappropriate transmission, limiting coverage.
Innovation Solution
A terminal applies a cyclic shift based on orthogonal cover codes (OCC) to a physical uplink control channel (PUCCH) using configuration information, defining a new PUCCH format for sequence-based long PUCCH transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional PUCCH transmission method is used, then the transmission structure is simple, but the UCI cannot be recognized properly by the network due to coverage limitations
Solution Approach 1:
The patent applies parameter changes by introducing cyclic shifts based on orthogonal cover codes (OCC) to modify the PUCCH transmission characteristics. Specifically, different OCCs are applied to different symbol positions within the PUCCH, creating distinct cyclic shift patterns that enable the network to properly recognize UCI even in coverage-limited scenarios. This transforms the transmission parameters to improve reliability without fundamentally changing the PUCCH structure.
Solution Approach 2:
The patent segments the PUCCH transmission by applying different orthogonal cover codes to different symbol positions (e.g., even symbols vs. odd symbols). This segmentation allows the network to process and recognize UCI from different parts of the transmission independently, improving overall recognition accuracy while maintaining a structured approach to the transmission format.
2Length of moving object
If the PUCCH transmission is extended to more than two symbols, then the coverage is enhanced, but the transmission may not be recognized properly without appropriate formatting
Solution Approach 1:
The patent changes the transmission parameters by applying orthogonal cover codes across multiple symbol positions in the extended PUCCH format. This allows the longer transmission to maintain proper recognition by the network, as the OCC-based cyclic shifts provide distinctive patterns that enable reliable UCI detection even when the PUCCH spans more than two symbols.
Solution Approach 2:
The patent employs periodic application of orthogonal cover codes across the extended PUCCH symbols. By systematically applying different OCCs to different symbol positions in a periodic manner, the transmission maintains structured patterns that facilitate network recognition while utilizing the extended time duration to improve coverage.
Data Source
AI summary
A terminal, as disclosed, includes: a receiver that receives configuration information related to repetitive transmissions of a physical uplink control channel (PUCCH); and a processor that applies a number of repetitions configured by the configuration information to the PUCCH. The repetitive transmissions of the PUCCH include a first repetitive transmission and a second repetitive transmission. The processor applies different parameters to the first repetitive transmission and the second repetitive transmission. When the repetitive transmissions of the PUCCH cross slots, the repetitive transmissions of the PUCCH have a contiguous phase. In other aspects, a radio communication method, a base station, and a system are also disclosed.