Common-Carrier Sidelink-Uplink Superposition for Interference Cancellation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing concurrent sidelink and uplink transmissions, particularly in vehicle-to-everything (V2X) networks, where simultaneous communication with base stations and other devices is hindered by interference and resource allocation inefficiencies.

Innovation Solution

A method for wireless communication devices to transmit a superposition transmission on a common carrier, including a base layer for uplink signals to a base station and an enhanced layer for sidelink signals, with interference assistance information to cancel the base layer, utilizing power split factors and modulation and coding schemes determined by the base station.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a common carrier is shared between uplink and sidelink communications, then spectrum utilization efficiency is improved, but interference between the two types of transmission increases

Engineering Contradiction:

Improvespectrum utilization efficiencyVSAvoidinterference between uplink and sidelink transmissions

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the transmitted signal into distinct layers: a base layer for uplink communication and an enhanced layer for sidelink communication. This segmentation allows both types of transmission to share the common carrier while maintaining distinguishable signal structures that can be independently decoded, thereby resolving the interference issue while preserving spectrum efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The enhanced layer for sidelink communication is nested within the base layer for uplink communication on the same time-frequency resources. The sidelink signal is superimposed on the uplink signal, creating a hierarchical signal structure where one signal type is embedded within another, enabling both to coexist on the shared carrier without mutual exclusion.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Adaptability or versatility

If superposition transmission is used to combine uplink and sidelink signals, then concurrent communication capability is improved, but signal processing complexity increases

Engineering Contradiction:

Improveconcurrent communication capabilityVSAvoidsignal processing complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The base station provides interference assistance information to the wireless communication device, which includes details about the base layer signal characteristics. This feedback mechanism enables the receiving device to accurately reconstruct and cancel the base layer signal, simplifying the extraction of the enhanced layer while maintaining the concurrent communication capability.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The base station acts as an intermediary that provides interference assistance information, enabling the wireless communication device to perform interference cancellation. This intermediary role simplifies the receiving device's processing by providing pre-computed interference characteristics, reducing the computational burden required to separate the superimposed signals.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If interference assistance information is transmitted to enable signal cancellation, then communication reliability is improved, but overhead on the common carrier increases

Engineering Contradiction:

Improvesignal cancellation accuracyVSAvoidoverhead information on common carrier

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The interference assistance information includes only the necessary parameters for accurate signal cancellation, such as base layer signal characteristics and interference properties. This partial information approach provides sufficient data for reliable signal separation without transmitting excessive overhead, optimizing the balance between cancellation accuracy and spectral efficiency.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12376141B2Superposition transmission of sidelink and uplink

Publication Date: 2025.07.29 QUALCOMM INC

AI summary

Aspects relate to mechanisms for a wireless communication device to generate a superposition transmission of a sidelink signal to be transmitted to at least one receiving wireless communication device and an uplink signal to be transmitted to a base station. The wireless communication device may transmit the superposition transmission on resources allocated by the base station on a common carrier utilized for both sidelink and uplink transmissions. The superposition transmission includes a base layer corresponding to the uplink signal and an enhanced layer corresponding to the sidelink signal. The wireless communication device may further generate and transmit interference assistance information to the receiving wireless communication device for use by the receiving wireless communication device in canceling the base layer from the superposition transmission.