PDCCH Monitoring Mapping for Mixed-Numerology Subslot Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing control channel monitoring occasions for different numerologies and sub-slot-based control channels, particularly in scenarios where subcarrier spacings for physical uplink control channels, physical downlink shared channels, and physical downlink control channels differ, leading to inefficiencies in feedback transmission.
Innovation Solution
The proposed solution involves a user equipment (UE) receiving a DCI message indicating a time slot or time subslot for feedback transmission, with the UE monitoring a set of PDCCH monitoring occasions based on subcarrier spacing mappings and transmitting feedback according to a codebook size determined by the quantity of these occasions, allowing for efficient feedback transmission despite differing subcarrier spacings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different subcarrier spacings are used for PUCCH, PDSCH, and PDCCH, then system flexibility and adaptability are improved, but feedback transmission efficiency deteriorates due to misalignment in monitoring occasions
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the feedback codebook size based on the number of PDCCH monitoring occasions. When different subcarrier spacings are used for PUCCH, PDSCH, and PDCCH, the system changes the codebook size parameter to match the actual number of monitoring occasions, thereby resolving the inefficiency caused by parameter mismatch while maintaining the flexibility of different subcarrier spacing configurations.
2Productivity
If codebook size is dynamically adjusted based on PDCCH monitoring occasions, then feedback transmission efficiency is improved, but system complexity increases due to additional mapping relationships
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously determine the feedback codebook size based on the counted PDCCH monitoring occasions within the feedback window. The UE independently establishes the mapping between monitoring occasions and codebook entries without requiring complex network coordination, thereby improving efficiency while managing complexity through self-determination at the UE side.
3Loss of time
If PUCCH is scheduled in subslots while PDCCH and PDSCH are scheduled in slots, then latency is reduced for feedback transmission, but synchronization complexity increases across different time granularities
Solution Approach 1:
The patent applies segmentation by dividing the feedback transmission process into two distinct time granularities: slot-level scheduling for PDCCH and PDSCH, and subslot-level scheduling for PUCCH. This segmentation allows feedback to be transmitted at the finer subslot granularity, reducing latency, while the slot-level scheduling maintains broader synchronization. The system manages the complexity by clearly separating the timing relationships at different granularity levels.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. The method may include a user equipment (UE) receiving, in a first time slot, a downlink control information (DCI) message indicating second time slot or first time subslot for transmitting feedback according to a codebook size. The feedback may be transmitted in a physical uplink control channel (PUCCH) associated with a physical downlink shared channel (PDSCH) scheduled by a physical downlink control channel (PDCCH). Corresponding subcarrier spacings (SCSs) for at least two of the PUCCH, the PDSCH, and the PDCCH may be different. The PUCCH may be scheduled as time subslots whereas both the PDSCH and the PDCCH may be scheduled as time slots. Further, the UE may monitor a set of one or more PDCCH monitoring occasions (PMOs) based on a mapping in accordance with a corresponding SCS, the PUCCH being scheduled as time subslots, or both, for feedback transmission.