Single DCI Scheduling Full-Duplex Downlink Uplink
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Solution Overview
Problem
Conventional wireless communication systems require separate downlink and uplink control information (DCI) messages for scheduling, which is inefficient in full-duplex networks where downlink and uplink grants share many parameters, and can cause interference in half-duplex UEs.
Innovation Solution
A method and apparatus for transmitting a single DCI message that schedules both downlink and uplink communications in full-duplex networks, using a frequency domain resource allocation (FDRA) field to indicate whether the allocation is for downlink, uplink, or both, and applying a guard time between downlink reception and uplink transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate DCI messages are used for downlink and uplink scheduling, then compatibility with half-duplex UEs is maintained, but scheduling efficiency deteriorates in full-duplex networks
Solution Approach 1:
The system dynamically adapts between two DCI message formats: separate DCI messages for half-duplex UEs and a combined DCI message for full-duplex UEs. The network entity determines the UE's duplex capability and selectively applies the appropriate scheduling format, enabling optimal performance for each UE type without compromise.
Solution Approach 2:
The invention changes the parameter structure of DCI messages based on UE capability. For full-duplex UEs, a single DCI message contains both downlink grant and uplink grant parameters, while for half-duplex UEs, separate DCI messages are used. This parameter restructuring resolves the contradiction between scheduling efficiency and compatibility.
2Productivity
If a single DCI message schedules both downlink and uplink, then scheduling efficiency improves, but interference management complexity increases
Solution Approach 1:
The single DCI message is segmented into distinct downlink grant and uplink grant sections, each with clearly defined parameters. The frequency domain resource allocation field is further segmented to indicate whether resources are allocated for downlink, uplink, or both directions. This segmentation simplifies interference management by providing structured resource allocation information.
Solution Approach 2:
The frequency domain resource allocation field acts as an intermediary that mediates between downlink and uplink resource allocation. It contains indication information that resolves potential conflicts by specifying which resources are allocated for which direction, enabling efficient full-duplex scheduling while managing interference through structured resource separation.
3Productivity
If downlink and uplink resources overlap in time, then resource utilization improves, but self-interference increases
Solution Approach 1:
The system applies preliminary anti-action by introducing a guard time between downlink reception and uplink transmission when resources overlap in time. This guard time preemptively counteracts self-interference before it occurs, enabling safe time-division full-duplex operation and improving resource utilization without excessive interference.
Solution Approach 2:
The invention converts the potential harm of self-interference into a benefit by using the frequency domain resource allocation indication to systematically manage overlapping resources. The indication information transforms the chaotic interference problem into a structured resource allocation scheme, enabling controlled full-duplex operation that improves overall resource utilization.
Data Source
AI summary
A method for wireless communication by a user equipment (UE) includes receiving downlink control information (DCI) including an uplink grant and a downlink grant. The DCI indicates a time domain resource allocation (TDRA) and a frequency domain resource allocation (FDRA). The method also includes determining whether the DCI is a single direction DCI or a bi-directional DCI based on whether the FDRA points to an uplink sub-band, and/or a downlink sub-band. The method further includes communicating in accordance with the DCI.