Sidelink UE Channel State Reporting Window Configuration

Solution Overview

Problem

Wireless communication systems face challenges in efficiently transmitting and receiving channel state reports, particularly when insufficient reference signals are received, affecting the reliability and latency of sidelink communications in 5G networks.

Innovation Solution

A method and apparatus for sidelink user equipment (UE) in a wireless communication system that receives a physical sidelink shared channel (PSSCH) including a channel state information reference signal (CSI-RS) and transmits a CSI report within a predetermined window, with configurable parameters such as resource pool, service type, quality of service (QoS), block error rate (BLER), speed, CSI payload size, and subchannel size, allowing for adaptive reporting based on detected CSI-RS availability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If channel state reporting is performed frequently to improve reliability, then reporting accuracy improves, but signaling overhead and latency increase

Engineering Contradiction:

Improvechannel state reporting reliabilityVSAvoidreporting latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements dynamic channel state reporting where the reporting behavior adapts based on detected channel conditions. The UE determines whether to perform channel state reporting based on comparing reference signal received power against thresholds, allowing the system to adjust reporting frequency dynamically rather than using fixed periodic reporting, thus balancing reliability improvement with latency control.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the reporting parameter (whether to perform channel state reporting) based on detected channel conditions. By monitoring reference signal received power and comparing against configured thresholds, the system adjusts the reporting parameter dynamically, enabling reliable reporting only when channel conditions warrant it, thereby reducing unnecessary reporting latency and overhead.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If channel state reporting is performed frequently to improve reliability, then reporting accuracy improves, but signaling overhead increases

Engineering Contradiction:

Improvechannel state reporting reliabilityVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent implements dynamic channel state reporting where the reporting behavior adapts based on detected channel conditions. The UE determines whether to perform channel state reporting based on comparing reference signal received power against thresholds, allowing the system to adjust reporting frequency dynamically rather than using fixed periodic reporting, thus balancing reliability improvement with overhead reduction.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the reporting parameter (whether to perform channel state reporting) based on detected channel conditions. By monitoring reference signal received power and comparing against configured thresholds, the system adjusts the reporting parameter dynamically, enabling reliable reporting only when channel conditions warrant it, thereby reducing unnecessary signaling overhead.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If reference signal resources are increased to improve channel state detection accuracy, then measurement precision improves, but resource consumption increases

Engineering Contradiction:

Improvechannel state detection accuracyVSAvoidreference signal resources

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent applies partial action by configuring multiple reference signal resources with different priorities and characteristics. The UE selectively uses reference signals based on detection success and channel conditions rather than always using all available reference signals, thereby achieving sufficient measurement precision without consuming all available reference signal resources continuously.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent changes the effective reference signal resources used based on detection conditions. When reference signal detection fails, the system adjusts by attempting alternative reference signals or adjusting measurement parameters, thereby optimizing the balance between measurement precision and resource consumption dynamically rather than using a fixed configuration.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20220077993A1Method and apparatus for sidelink terminal to transmit and receive signal related to channel state report in wireless communication system

Publication Date: 2022.03.10 LG ELECTRONICS INC

AI summary

A method of transmitting and receiving a signal by a sidelink user equipment (UE) in a wireless communication system includes receiving a physical sidelink shared channel (PSSCH) including a channel state information reference signal (CSI-RS) and transmitting a channel state information (CSI) report based on the CSI-RS within a predetermined window. A parameter related to the predetermined window is independently configured with respect to at least one of a resource pool, a service type, a priority, a quality of service (QoS) parameter, a block error rate (BLER), a speed, a CSI payload size, a subchannel size or a frequency resource region size.