PUCCH Resource Allocation for Low-Latency UE-Initiated CSI Reporting
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Solution Overview
Problem
Existing wireless communication systems lack efficient mechanisms for user equipment (UE)-initiated reporting of channel state information (CSI) and beam management, leading to increased latency and potential link failures due to suboptimal resource allocation and lack of timely UE-initiated reporting.
Innovation Solution
The system enables UE-initiated reporting by determining event instances and PUCCH resources for transmitting CSI reports, allowing the UE to proactively manage beam conditions and channel states without waiting for network requests, using predefined rules or network configurations for resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If network-initiated CSI reporting is used, then resource allocation is controlled by the network, but latency increases and reporting responsiveness deteriorates
Solution Approach 1:
The network pre-configures UE with multiple PUCCH resources and event thresholds before actual reporting is needed. When an event occurs, the UE can immediately select and use the appropriate pre-configured resource without waiting for network allocation, reducing latency while maintaining network oversight through configuration.
Solution Approach 2:
The system transitions from static network-controlled resource allocation to dynamic UE-autonomous selection among pre-configured resources. The UE dynamically selects the appropriate PUCCH resource based on real-time event detection and configured criteria, enabling faster response while the network maintains control through initial configuration.
2Productivity
If UE autonomously selects PUCCH resources without network configuration, then reporting speed increases, but resource allocation accuracy and network coordination deteriorate
Solution Approach 1:
The network performs preliminary configuration by providing the UE with a set of pre-configured PUCCH resources and associated parameters (time windows, event thresholds, resource mappings). This preliminary setup enables the UE to autonomously and accurately select appropriate resources when events occur, combining fast autonomous decision-making with network-coordinated accuracy.
Solution Approach 2:
The network provides feedback in the form of configured event thresholds and resource mappings that guide UE autonomous selection. The UE uses this feedback information to make accurate resource selections based on detected events, ensuring both speed and accuracy aligned with network intentions.
3Measurement precision
If event evaluation time window is extended, then measurement accuracy improves, but reporting time and system responsiveness worsen
Solution Approach 1:
The network pre-configures specific time windows and event thresholds for different event types before actual measurement occurs. The UE evaluates events within these pre-defined time windows rather than using unlimited duration, achieving sufficient measurement accuracy for reliable event detection while maintaining system responsiveness through bounded evaluation periods.
Solution Approach 2:
The system changes the parameter of time window duration based on event type and network configuration. Different events have different pre-configured time windows, allowing the system to optimize between measurement accuracy and responsiveness by selecting appropriate time parameters for each specific event scenario.
Data Source
AI summary
Methods and apparatuses for resource allocation for user equipment (UE)-initiated reporting. A method performed by a user equipment (UE) includes receiving first information related to one or more first reference signals (RSs), receiving second information related to an event, and receiving third information related to one or more physical uplink control channel (PUCCH) resources. The method further includes determining, based on the first and second information, an event instance for a first transmission occasion (TO) of a first RS from the one or more first RSs, determining, based on the second information and the event instance, a time window starting from the first TO to evaluate the event, and determining, based on the second information and the time window, the event. The method further includes determining, based on the third information and the event, a PUCCH resource from the one or more PUCCH resources and transmitting, on the PUCCH resource, an indicator to initiate a channel state information (CSI) report.