PUCCH Format 3 for Large Payload CSI Transmission

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Solution Overview

Problem

Current methods for transmitting channel state information (CSI) 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 performance degradation and increased overhead, especially in scenarios with multiple serving cells.

Innovation Solution

The use of physical uplink control channel (PUCCH) format 3 for transmitting CSI, which enables the transmission of a larger number of bits using quadrature phase shift keying (QPSK) modulation, allows for multiplexing multiple user equipment (UEs) and employs spatial orthogonal resource transmit diversity (SORTD) and frequency hopping across slots to enhance performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If PUSCH is used for transmitting multi-cell periodic CSI, then the transmission capacity is improved, but the multiplexing capability deteriorates (only one UE can be multiplexed)

Engineering Contradiction:

Improvetransmission capacityVSAvoidmultiplexing capability

Core Design Contradiction:

Quantity of substanceVSAdaptability or versatility

Solution Approach 1:

The patent segments the uplink control information transmission by introducing a new PUCCH format (Format 3) specifically designed for large payload CSI feedback. This separates the control channel functionality from the shared data channel, allowing multiple UEs to be multiplexed on PUCCH resources while PUSCH remains available for data transmission, thus resolving the multiplexing limitation without sacrificing transmission capacity.

Inventive Principle:

Principle #1Segmentation

2Device complexity

If PUSCH is used for CSI transmission, then the transmission format is simplified, but transmit diversity is lost (no transmit diversity scheme available)

Engineering Contradiction:

Improvetransmission format complexityVSAvoidtransmit diversity

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent introduces PUCCH Format 3 as an intermediary specialized channel between the CSI feedback requirement and the uplink transmission resources. This new format acts as a mediator that provides both the simplified transmission structure needed for control information and the transmit diversity capabilities (through multiple antenna ports and orthogonal resources) that were missing from PUSCH-based solutions.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If intra-subframe frequency hopping is implemented, then frequency diversity gain is improved, but the implementation complexity increases (most UEs do not apply it)

Engineering Contradiction:

Improvefrequency diversity gainVSAvoidimplementation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements dynamic frequency hopping across slots within a subframe for PUCCH Format 3 transmissions. The frequency position changes between slots, providing frequency diversity gain to improve reliability. This dynamic resource allocation is configured through RRC signaling and allows UEs to benefit from frequency diversity without requiring complex intra-subframe hopping implementations, as the hopping pattern is predetermined and standardized.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP2880789B1Uplink control information transmission with large number of bits

Publication Date: 2019.09.25 INTEL CORP

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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.