HARQ Process Number Segmentation in Single DCI Scheduling
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Solution Overview
Problem
In the context of LTE networks, asynchronous re-transmission control of uplink data in unlicensed bands faces challenges when multi-subframe scheduling is performed using single Downlink Control Information (DCI), leading to inadequate re-transmission control in both unlicensed and licensed bands.
Innovation Solution
A user terminal is equipped with a receiving section for DCI and a control section that determines the HARQ process number (HPN) for each subframe based on the HPN field in the DCI, enabling appropriate asynchronous re-transmission control of uplink data across multiple subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-subframe scheduling is performed using single DCI in unlicensed band, then scheduling efficiency is improved, but asynchronous re-transmission control of UL data cannot be appropriately performed
Solution Approach 1:
The patent segments the HARQ process number field into multiple parts: a first value indicating a base HARQ process number, and a second value indicating an offset. This segmentation allows the system to represent multiple HARQ process numbers using a compact structure within the single DCI, thereby enabling appropriate asynchronous re-transmission control while maintaining scheduling efficiency.
2Loss of information
If single DCI is used to schedule UL data transmission in multiple subframes, then control signaling overhead is reduced, but HARQ process identification becomes ambiguous
Solution Approach 1:
The patent introduces a new dimensional structure for HARQ process identification by combining a base HARQ process number with an offset value. This dimensional approach allows the system to encode multiple HARQ process identifiers within the constraints of the DCI format, reducing control signaling overhead while maintaining precise HARQ process identification through the composite indexing mechanism.
Data Source
AI summary
In scheduling transmission of UL data in a plurality of subframes using single DCI, asynchronous re-transmission control of this UL data is appropriately performed. A user terminal according to an aspect of the present invention includes a receiving section that receives downlink control information (DCI) and a control section that controls transmission of an uplink shared channel in each of a plurality of subframes based on the DCI. The control section determines an HARQ process number (HPN) to use in each of the plurality of subframes based on a HPN field included in the DCI.