Sidelink S-SSB Frequency Hopping Against Narrowband Interference

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Solution Overview

Problem

Sidelink synchronization signals (S-SS/PSBCH blocks) are often corrupted by high-power narrowband interferers, leading to synchronization failures in wireless sidelink communications, especially in spectrum sharing scenarios or due to intentional jamming, which disrupts the detection of synchronization signals by neighboring WTRUs.

Innovation Solution

Implementing a method where WTRUs receive configuration information for multiple S-SS/PSBCH transmissions on different frequencies and times, and perform beam sweeping across various directions to enhance synchronization signal detection and mitigate interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If S-SS/PSBCH blocks are transmitted on a single frequency location, then the transmission is simple and deterministic, but the reception is vulnerable to high-power narrowband interferers causing synchronization failures

Engineering Contradiction:

Improvesynchronization signal detection reliabilityVSAvoidinterference from narrowband interferers

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent divides the single S-SS/PSBCH transmission into multiple transmissions at different frequency locations. Instead of one vulnerable transmission, the synchronization signal is segmented across multiple frequency resources, so that if one frequency is interfered with, others can still be detected successfully.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces frequency diversity by transmitting S-SS/PSBCH blocks at multiple frequency locations rather than a single frequency. This adds a frequency dimension to the transmission, creating multiple independent paths for signal detection and reducing vulnerability to frequency-specific interference.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If multiple S-SS/PSBCH transmissions are configured on different frequencies and times, then the resilience against interference is improved, but the device complexity and configuration overhead increase

Engineering Contradiction:

Improvesynchronization signal detection reliabilityVSAvoidconfiguration and monitoring complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs periodic S-SS/PSBCH transmissions at different frequency locations within a defined transmission period. This periodic structure provides predictable patterns for WTRUs to monitor, reducing complexity compared to entirely random transmissions while maintaining diversity benefits.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The network configures WTRUs in advance with the multiple frequency locations and transmission timing for S-SS/PSBCH blocks. This preliminary configuration allows WTRUs to prepare their reception parameters beforehand, reducing real-time processing complexity despite the multiple transmission points.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250358752A1S_SSB frequency hopping for robust sidelink in contested and congested environments

Publication Date: 2025.11.20 INTERDIGITAL PATENT HOLDINGS INC

AI summary

Methods are described for ensuring robust S-SS/PSBCH blocks (S-SSBs) reception on the sidelink in the presence of high-power narrowband interference include frequency hopped S-SSB transmission to mitigate high-power narrowband interference such that if one frequency location of S-SSBs is corrupted by the high-power narrowband interference, the other frequency location(s) of the S-SSBs may not be affected.