Uplink Scheduling Grant for Multi-Slot PUSCH Transmission
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Solution Overview
Problem
The New Radio (NR) standard faces challenges in efficiently managing Physical Downlink Control Channel (PDCCH) overhead due to the need for separate uplink scheduling grants for each slot, especially when scheduling multiple slots or mini-slots, which can lead to resource exhaustion and inefficiencies, particularly in scenarios with high numbers of user equipment (UEs) or long transmission bursts.
Innovation Solution
A method is introduced to reduce PDCCH overhead by enabling multi-slot and mini-slot scheduling through a single uplink scheduling grant, where the Downlink Control Information (DCI) includes indications for time domain resources, allowing for efficient determination and transmission across multiple slots or mini-slots, thereby optimizing resource allocation and reducing unnecessary waste of PDCCH resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate uplink scheduling grants are sent for each slot, then scheduling precision is improved, but PDCCH overhead increases and resources are exhausted
Solution Approach 1:
The patent combines multiple slot scheduling information into a single uplink scheduling grant. The DCI format includes a time domain resource assignment field that can indicate multiple slots using compact representations such as slot offset indicators and slot duration fields, allowing one grant to schedule multiple slots instead of requiring separate grants for each slot
Solution Approach 2:
The patent introduces a new dimension for resource indication by using slot offset indicators and slot duration fields in the DCI format. This allows the time domain resource assignment to specify multiple slots through numerical parameters rather than requiring separate grants, effectively compressing multiple scheduling decisions into a single dimensional space
2Adaptability or versatility
If multiple slots are scheduled with separate grants, then resource allocation flexibility is improved, but signaling efficiency deteriorates
Solution Approach 1:
The uplink scheduling grant is designed with multi-functional capability to handle diverse scheduling scenarios. The DCI format includes configurable fields such as slot offset indicators, slot duration fields, and mini-slot indicators that can be configured through higher layer parameters, allowing the same grant structure to adapt to different slot configurations and service requirements
Solution Approach 2:
The patent utilizes parameter changes in the DCI format to achieve flexible resource allocation. By modifying parameters such as slot offset values, slot duration, and mini-slot indicators based on higher layer configurations, the system can dynamically adjust resource allocation for different slots without changing the fundamental grant structure, thereby maintaining signaling efficiency
3Reliability
If separate grants are used for each transmission, then transmission reliability is improved, but resource utilization deteriorates
Solution Approach 1:
The patent implements preliminary action by providing a single uplink scheduling grant that pre-configures multiple slots in advance. The UE receives one grant containing time domain resource assignments for multiple slots, allowing the UE to prepare for multiple transmissions ahead of time without requiring separate grants for each slot, thus improving resource utilization while maintaining reliability
Data Source
AI summary
A method performed by a wireless device 410 is provided for receiving an uplink scheduling grant for a plurality of physical uplink shared channels (PUSCHs). The method includes receiving, from a network node 460, downlink control information (DCI). The DCI includes an indication corresponding to at least a time domain resource for each of the plurality of PUSCHs. Based on the indication, uplink scheduling grant resources are determined for the plurality of PUSCHs. At least one transmission is sent according to the determined uplink scheduling grant resources.