Aperiodic CSI Scheduling with Separate PUCCH and HARQ ACK in URLLC
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Solution Overview
Problem
Existing communication systems struggle to efficiently handle ultra-reliable low-latency communications (URLLC) by timely updating channel state information (CSI) due to limitations in triggering and scheduling aperiodic CSI reports, which are crucial for adapting to changing channel conditions.
Innovation Solution
The method involves triggering aperiodic CSI reports using a downlink grant to determine separate physical uplink control channel (PUCCH) resources for CSI transmission and hybrid automatic repeat request (HARQ) acknowledgment, with distinct transmission powers based on downlink control information (DCI), allowing for timely and reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aperiodic CSI reports are triggered using traditional scheduling methods, then channel state information can be updated, but the latency and reliability performance deteriorates due to inability to transmit CSI and HARQ ACK separately and timely
Solution Approach 1:
The patent segments the uplink control information by determining separate PUCCH resources for ACSI transmission and HARQ ACK transmission. This allows the two types of control information to be transmitted independently on different resources, enabling timely CSI updates without being constrained by HARQ ACK timing requirements, thus reducing latency while maintaining reliability for URLLC communications.
2Productivity
If separate PUCCH resources are determined for ACSI and HARQ ACK transmission, then transmission timing and reliability are improved, but device complexity increases due to additional resource determination and power calculation
Solution Approach 1:
The patent applies preliminary action by determining the separate PUCCH resources for ACSI and HARQ ACK transmission in advance, based on the downlink grant that triggers the aperiodic CSI report. The network entity configures and indicates these resources beforehand, allowing the user equipment to efficiently transmit both control information types without complex real-time scheduling decisions, thus improving communication efficiency while managing device complexity.
Data Source
AI summary
Methods and apparatus are provided, in which a downlink (DL) grant is received (902) triggering an aperiodic channel state information (ACSI) report and a physical downlink shared channel (PDSCH) transmission being scheduled. A first physical uplink control channel (PUCCH) resource for ACSI transmission and a second PUCCH resource for hybrid automatic repeat request (HARQ) acknowledgment (ACK) transmission corresponding to the scheduled PDSCH are determined (904). A first PUCCH transmission power for the ACSI transmission using the first PUCCH resource and a second transmission power for the HARQ ACK transmission using the second PUCCH resource are determined (906) based on downlink control information (DCI) of the DL grant.