Assignment Index Ordering for HARQ Feedback in Multi-Cell Scheduling
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Solution Overview
Problem
Wireless communication systems face challenges in determining the order of assignment indicator values for downlink transmissions when two scheduling serving cells schedule transmissions in the same scheduled serving cell during the same monitoring occasion, as existing rules may not be applicable or have limited applicability in such scenarios.
Innovation Solution
The proposed solution involves a method where a user equipment (UE) receives control information from multiple serving cells, identifies indexes associated with each serving cell, and determines the order of assignment indicator values based on these indexes, start times of scheduled transmissions, and monitoring occasions to construct a hybrid automatic repeat request (HARQ) feedback message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing ordering rules are applied to assignment indicator values from multiple scheduling serving cells, then the feedback message construction becomes straightforward, but the rules are not applicable or have limited applicability when two scheduling serving cells schedule transmissions in the same scheduled serving cell during the same monitoring occasion
Solution Approach 1:
The patent segments the determination of assignment indicator value order into multiple hierarchical levels: first by monitoring occasion, then by scheduling serving cell index, and finally by scheduled transmission start time. This segmentation allows existing rules to apply within each segment while providing a systematic method to handle the complex cross-cell scheduling scenario.
Solution Approach 2:
The patent introduces a new dimension for ordering assignment indicator values by incorporating the scheduling serving cell index as an additional sorting criterion. This multi-dimensional approach (monitoring occasion → serving cell index → transmission start time) resolves the contradiction by providing a comprehensive ordering framework that works across multiple serving cells.
2Productivity
If assignment indicator values from multiple scheduling serving cells are grouped into a single feedback message, then communication resource utilization is improved, but determining the order of these values becomes complex when existing rules are not applicable
Solution Approach 1:
The patent merges assignment indicator values from multiple scheduling serving cells into a single unified feedback message by establishing a comprehensive ordering rule that considers monitoring occasion, serving cell index, and transmission start time. This merging maintains resource efficiency while providing a systematic method to handle the complexity of multi-cell scheduling.
Solution Approach 2:
The patent performs preliminary ordering of assignment indicator values based on serving cell indexes and transmission start times before constructing the feedback message. This preliminary action simplifies the feedback construction process by pre-establishing the correct sequence of values to be reported.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may order assignment indicator values for transmissions for use by feedback information in a feedback message. The UE may receive, during a monitoring occasion, a first control information over a first serving cell and a second control information over a second serving cell, where each control information schedules a respective transmission for a scheduled serving cell. The UE may order assignment indicator values for the transmissions based on indexes associated with the first and second serving cells (e.g., scheduling serving cells), an index associated with the scheduled serving cell, a start time of the transmissions, or some combination thereof, among other examples. The assignment indicator values may be associated with hybrid automatic repeat request acknowledgement (HARQ/ACK) feedback, such that the UE may use the assignment indicator values to construct and transmit a feedback message.