Sidelink Resource Indication via Interference-Aware SCI

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Solution Overview

Problem

In wireless communications, existing sidelink systems fail to effectively account for interference in resource reservations, leading to decoding errors and inefficient use of network resources during sidelink communications.

Innovation Solution

A method where a transmitting UE indicates reserved resources to a receiving UE through sidelink control information, including a bitmap for interference levels, allowing the UE to buffer and perform soft combining of data packets even if the initial SCI is not decodable, thereby improving network efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a transmitting UE indicates future reserved resources in SCI without accounting for interference, then resource reservation is simplified, but decoding errors occur and network resource efficiency deteriorates

Engineering Contradiction:

Improveresource reservation indication complexityVSAvoiddecoding reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The transmitting UE performs preliminary interference assessment before indicating reserved resources in SCI. The UE evaluates potential interference levels on candidate resources and selectively indicates only those resources that meet interference thresholds, preventing receiving UEs from wasting processing efforts on highly interfered resources while maintaining reliable decoding.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback mechanisms where receiving UEs report interference observations and decoding outcomes to transmitting UEs. This feedback loop enables transmitting UEs to adjust their resource indication strategies dynamically, improving decoding reliability while optimizing resource utilization efficiency.

Inventive Principle:

Principle #23Feedback

2Ease of operation

If a transmitting UE indicates future reserved resources in SCI without accounting for interference, then the resource indication process is simpler, but network resource efficiency deteriorates due to decoding errors

Engineering Contradiction:

Improveresource indication easeVSAvoidnetwork resource efficiency

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts resource indication parameters based on observed interference conditions. When interference levels are low, more aggressive resource reservations are indicated to maximize throughput. When interference is high, the indication strategy becomes more conservative, selecting only high-quality resources. This adaptive parameter adjustment maintains ease of operation while optimizing network resource efficiency.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the transmitting UE transmits additional SCI to indicate previously used resources, then decoding reliability improves through interference awareness, but control message overhead increases

Engineering Contradiction:

Improvedecoding reliabilityVSAvoidcontrol message overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent extracts only the essential interference-related information from the full resource history and transmits it in additional SCI. Specifically, the transmitting UE identifies and reports only those previously used resources that are likely to cause or experience interference, rather than reporting all historical resources. This selective extraction maintains decoding reliability while minimizing control message overhead.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system applies partial action by transmitting additional SCI only when interference conditions warrant it. The transmitting UE monitors interference levels and selectively sends additional resource indication messages only when previously used resources are predicted to cause significant interference. This approach achieves sufficient decoding reliability without the excessive overhead of always transmitting complete resource histories.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS11812413B2Reserved resource indication for sidelink systems

Publication Date: 2023.11.07 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communications are described. One or more user equipments (UEs) may support reserved resource indications for sidelink systems. In some examples, a first UE may transmit a first sidelink control message to at least a second UE in a first transmission time interval (TTI), which may schedule a first set of time-frequency resources for a sidelink message. The first UE may transmit the sidelink message to the second UE using the first set of time frequency resources. After transmitting the sidelink message, the first UE may transmit a second sidelink control message to the second UE in a second TTI, which may indicate the first set of time-frequency resources used for transmission of the sidelink message. In some examples, the second UE may perform a decoding procedure for the sidelink message based on the second sidelink control message.