NR V2X Sidelink CSI Reporting With Latency-Bound Resource Selection
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Solution Overview
Problem
In NR V2X communication, there is a need for clear criteria for determining the time point of sidelink channel state information (SL CSI) reporting and resource selection, as well as defining priorities between SL CSI and SL data, and configuring hybrid automatic repeat request (HARQ) feedback, due to SL CSI information being directly generated in the MAC entity.
Innovation Solution
A method for a first device to receive latency bounds, select resources within a selection window, and transmit SL CSI using a MAC Control Element (CE) to a second device, addressing the timing and resource allocation issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SL CSI information is directly generated in the MAC entity, then the reporting flexibility and adaptability are improved, but the timing and resource allocation become uncertain and complex
Solution Approach 1:
The patent implements dynamic resource selection by allowing the UE to autonomously choose transmission resources within a configurable window based on current channel conditions and QoS requirements. The resource selection window and reporting periodicity are dynamically adjustable parameters that adapt to varying traffic patterns and channel states, resolving the complexity through flexible dynamic configuration rather than fixed rigid timing
Solution Approach 2:
The patent introduces configurable parameters including reporting periodicity, resource selection window size, and priority levels for different SL CSI reports. These parameters can be adjusted based on QoS requirements and channel conditions, transforming the complex timing and resource allocation problem into a manageable parameter optimization task with clear trade-offs between reporting frequency, latency, and resource consumption
2Reliability
If resource selection window is extended to ensure timely reporting, then the reporting reliability is improved, but the resource consumption and collision probability increase
Solution Approach 1:
The patent implements partial resource utilization by allowing UEs to select from a window of potential resources rather than allocating fixed resources to all UEs. The resource selection window is configured to provide sufficient options for reliable reporting while leaving many resources unused or shared, reducing overall resource consumption while maintaining reporting reliability through autonomous UE selection based on local channel conditions
3Loss of time
If SL CSI reporting priority is increased to meet latency requirements, then the latency performance is improved, but the data transmission throughput decreases
Solution Approach 1:
The patent applies local quality differentiation by assigning different priority levels to different SL CSI reports based on their specific QoS requirements and channel conditions. High-priority reports with strict latency requirements can preempt lower-priority data transmissions, while lower-priority reports allow more flexible scheduling. This localized priority assignment optimizes latency-critical reports without unnecessarily sacrificing overall data throughput
Data Source
AI summary
Proposed is a method for performing, by a first apparatus, wireless communication. The method may comprise the steps of: receiving, from a second apparatus, information about latency bound related to sidelink channel state information; selecting a resource to transmit the sidelink channel state information in a selection window, on the basis that a reserved resource does not exist in a time window for reporting the sidelink channel state information; and transmitting, to the second apparatus, an MAC CE including the sidelink channel state information in the time window through the selected resource. For example, the time window may be determined on the basis of the latency bound. For example, the selection window may be determined on the basis of at least one of the time window, a time offset value, or a requirement related to the sidelink channel state information.