PUCCH Format 3 Transmission for Large Uplink Control Information
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Solution Overview
Problem
Current methods for transmitting uplink control information (UCI) with a large number of bits in wireless communications, such as using the physical uplink shared channel (PUSCH), face challenges like limited multiplexing capabilities and lack of transmit diversity, which can lead to dropped channel state information (CSI) and suboptimal performance.
Innovation Solution
The use of physical uplink control channel (PUCCH) format 3, which enables the transmission of up to 48 encoded bits per subframe using quadrature phase shift keying (QPSK) modulation, allowing for multiplexing of five UEs and employing spatial orthogonal resource transmit diversity (SORTD) and frequency hopping across slots to enhance block error rate (BLER) performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If PUSCH-based transmission is used for multi-cell periodic CSI, then the transmission capacity is improved, but the multiplexing capability deteriorates (only one UE can be multiplexed)
Solution Approach 1:
The patent transitions from PUSCH-based transmission to PUCCH format 3 transmission, representing a dimensional change in the physical channel layer. This enables multiple UEs to be multiplexed on the same time-frequency resources through code division multiplexing, thereby improving multiplexing capability while maintaining transmission capacity for large number of CSI bits
2Device complexity
If PUSCH-based transmission is used for multi-cell periodic CSI, then the transmission format is simplified, but the transmit diversity is lost (no transmit diversity scheme available)
Solution Approach 1:
The patent changes the transmission parameters by using PUCCH format 3 instead of PUSCH, which enables the application of transmit diversity schemes such as cyclic shift diversity and orthogonal cover code diversity. These parameter changes maintain relatively simple transmission formats while restoring transmit diversity capabilities through code-domain separation
3Device complexity
If intra-subframe frequency hopping is not applied, then the implementation complexity is reduced, but the frequency diversity gain is lost
Solution Approach 1:
The patent implements frequency hopping across slots within a subframe, creating a periodic action pattern where the transmission frequency changes between slots. This provides frequency diversity gain by transmitting the same data on different frequency resources, while keeping the implementation complexity manageable through standardized hopping patterns configured by higher layers
Data Source
AI summary
Embodiments of the present disclosure describe devices, methods, computer-readable media and systems configurations for transmitting periodic channel state information having large payload sizes. Other embodiments may be described and claimed.