Flexible Reference Signal Reception for Wireless Coexistence

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Solution Overview

Problem

Existing wireless communication systems face inflexibility in managing reference signals due to strict adherence to predefined signaling structures, which hinders dynamic coexistence between new and legacy standards, especially in scenarios involving overlapping bandwidths and varying numerology sets, leading to challenges in cell detection and interference management.

Innovation Solution

A multilevel approach for receiving reference signals that includes flexible placement of synchronization signals in time-frequency resources, combined with two-step measurement procedures, allowing for increased cell IDs without increasing detection hypotheses, and coordinated PSS/SSS frequency resources to manage interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Difficulty of detecting and measuring

If synchronization signals are transmitted within the center 6 physical resource blocks (PRBs) of a transmission channel bandwidth, then it makes it easier to locate and identify the synchronization signals, but it restricts the location of the synchronization signals in a predetermined way which makes the system less flexible in terms of introducing a new type of service and avoiding strong interference

Engineering Contradiction:

Improveease of locating and identifying synchronization signalsVSAvoidflexibility in introducing new services and avoiding interference

Core Design Contradiction:

Difficulty of detecting and measuringVSAdaptability or versatility

Solution Approach 1:

The patent segments the synchronization signal transmission into multiple levels: a first level with signals transmitted at predetermined locations (center 6 PRBs) for easy detection, and a second level with signals transmitted at flexible locations for new services. This segmentation allows the system to maintain both the ease of locating synchronization signals and the flexibility to introduce new services with different numerology sets.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a multilevel approach that adds a dimensional layer to synchronization signal transmission. Instead of a single fixed location, the system operates in multiple transmission dimensions (predetermined locations and flexible locations), allowing simultaneous support for legacy services and new services with different numerology sets without interference.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If a predetermined signaling structure is strictly adhered to for synchronization signals, then the system maintains consistency and ease of detection, but it makes the system less flexible in terms of enabling shared spectrum access with other radio access technologies

Engineering Contradiction:

Improveconsistency of signaling structureVSAvoidflexibility in shared spectrum access

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies dynamics by making the synchronization signal transmission structure adaptable rather than static. The system dynamically selects between predetermined locations (for consistency and reliability) and flexible locations (for shared spectrum access with other radio access technologies). This dynamic approach allows the system to maintain reliability when needed while enabling flexibility for spectrum sharing scenarios.

Inventive Principle:

Principle #15Dynamics

3Device complexity

If the system uses a fixed approach for cell detection with predetermined synchronization signal locations, then the detection process is simplified, but it increases interference to primary and secondary synchronization signals and reduces system flexibility

Engineering Contradiction:

Improvesimplicity of cell detection processVSAvoidinterference to synchronization signals

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces an intermediary multilevel transmission approach between the fixed predetermined locations and flexible new service locations. This intermediary structure allows the system to maintain simple detection processes for legacy signals while preventing interference to synchronization signals by providing separate transmission paths for different services with different numerology sets.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP3479624B1Method and apparatus for receiving reference signals in support of flexible radio communication

Publication Date: 2025.10.01 MOTOROLA MOBILITY LLC

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AI summary

A method and apparatus (110) include receiving (702) a measurement configuration by higher layer signaling, where the higher layer signaling is above the physical layer. The measurement configuration includes at least information of frequency location of synchronization signals, a carrier frequency, and a maximum allowed measurement bandwidth (706). A measurement reference signal is then received (712) based on the received measurement configuration, and a measurement based on the received measurement reference signal is performed (716).