User Terminal Spatial Resource Determination for Uplink Control
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Solution Overview
Problem
In future radio communication systems, determining an appropriate spatial resource for the uplink control channel is challenging, leading to potential reductions in communication quality unless the uplink control channel is transmitted using an appropriate spatial resource.
Innovation Solution
A user terminal receives multiple entries of information related to spatial resources for the uplink control channel using a higher layer and specifies at least one entry using a downlink shared channel, with control over transmission acknowledgment information based on feedback timing and application timing to ensure appropriate spatial resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user terminal transmits uplink control channel using beamforming spatial resources, then communication quality can be improved, but it is difficult to determine the appropriate spatial resource without causing reduction in communication quality
Solution Approach 1:
The base station performs preliminary action by notifying the user terminal of spatial resource information (such as beamforming parameters or spatial relation information) through higher layer signaling (RRC signaling) or physical downlink control channel (PDCCH) signaling. This advance notification enables the user terminal to determine appropriate spatial resources for uplink control channel transmission without complex real-time calculations, thereby improving communication quality while reducing determination complexity
Solution Approach 2:
The base station acts as an intermediary by providing spatial resource information that mediates between the network's beamforming configuration and the user terminal's uplink transmission. The base station translates complex spatial resource requirements into notifyable information (such as SRS resource indicators or TCI state information) that the user terminal can directly apply, simplifying the spatial resource determination process while ensuring optimal communication quality
2Adaptability or versatility
If the user terminal determines spatial resource and uplink control channel resource separately, then flexibility in resource allocation is improved, but coordination between feedback timing and spatial resource application timing becomes complex
Solution Approach 1:
The patent merges the determination processes of spatial resources and uplink control channel resources by establishing that both are notified through the same downlink signaling (PDCCH or RRC). The spatial resource information and uplink control channel resource information are provided together in coordinated fashion, ensuring that feedback timing and spatial resource application timing are automatically aligned without requiring separate coordination mechanisms
Solution Approach 2:
The base station performs preliminary coordination by notifying both spatial resource information and uplink control channel resource information in advance through higher layer signaling or physical downlink control channel signaling. This preliminary notification includes timing information that enables the user terminal to apply both resources at the appropriate time without complex real-time coordination, maintaining flexibility while reducing timing coordination complexity
Data Source
AI summary
To determine an appropriate spatial resource for an uplink control channel. A user terminal includes a receiving section that receives a plurality of entries of information related to a spatial resource for an uplink control channel by using a higher layer, and receives specification information specifying at least one entry among the plurality of entries by using a downlink shared channel, and a control section that controls transmission of delivery acknowledgment information for the downlink shared channel, based on feedback timing of the delivery acknowledgment information and application timing of the spatial resource based on the specification information.