User Terminal Uplink Control Information Scheduling Flexibility
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Solution Overview
Problem
In future radio communication systems, such as NR and 5G, the challenge lies in appropriately controlling uplink control information during repetition transmission of channels like PDSCH, especially when multiple pieces of downlink control information are used for scheduling.
Innovation Solution
A user terminal is designed with a receiving section to handle repeatedly transmitted downlink shared channels and a control section that manages acknowledgment signal transmissions using resources specified by at least one piece of downlink control information, even when transmissions are controlled by multiple pieces of DCI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate pieces of DCI are used for each PDSCH transmission to flexibly control repetition transmission, then scheduling flexibility is improved, but control of HARQ-ACK feedback becomes complex and communication quality may deteriorate
Solution Approach 1:
The patent merges multiple separate DCI messages into a single DCI that schedules multiple PDSCH repetitions. This single DCI contains resource allocation information that applies to all repeated transmissions, thereby reducing the complexity of HARQ-ACK feedback control while maintaining scheduling flexibility through the unified resource allocation mechanism.
Solution Approach 2:
The patent implements a universal DCI structure that serves multiple functions: it schedules multiple PDSCH repetitions across different slots and provides the basis for HARQ-ACK feedback control. This multi-functional DCI eliminates the need for separate control messages for each transmission, simplifying the overall control mechanism.
2Adaptability or versatility
If multiple pieces of DCI are used to control PDSCH transmissions in respective slots, then transmission control flexibility is improved, but determination of feedback timing for HARQ-ACK becomes difficult
Solution Approach 1:
The patent combines multiple DCI messages into one unified DCI that schedules all PDSCH repetitions. This unified approach establishes a single feedback timing determination basis, eliminating the ambiguity that arises when multiple separate DCI messages with different timing indications are used.
Solution Approach 2:
The patent performs preliminary resource allocation in the single DCI message, specifying the resource allocation that applies to all subsequent PDSCH repetitions. This preliminary action includes defining the feedback timing relationship, which is then consistently applied to all repeated transmissions, simplifying the timing determination process.
3Device complexity
If one piece of DCI is used to schedule PDSCH over multiple slots, then control complexity is reduced, but scheduling flexibility deteriorates
Solution Approach 1:
The patent implements a dynamic resource allocation mechanism within the single DCI structure. The resource allocation fields in the DCI are designed to accommodate variations across multiple slots, allowing the system to adapt to different scheduling requirements while maintaining a unified control approach. This dynamic capability preserves scheduling flexibility without requiring multiple separate DCI messages.
Data Source
AI summary
In order to appropriately control uplink control information even in a case of controlling repetition transmission by use of a plurality of pieces of downlink control information, a user terminal according to the present disclosure includes a receiving section that receives downlink shared channels repeatedly transmitted by use of a plurality of slots, and a control section that, in a case that transmissions of the downlink shared channels transmitted in the respective slots are controlled based on different pieces of downlink control information, controls transmissions of acknowledgment signals for the downlink shared channels repeatedly transmitted, using a resource specified by at least one piece of downlink control information.