Sidelink Beamforming Using QCL Reference Signals to Prevent Uu Interference
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Solution Overview
Problem
In V2X communications, the introduction of beamforming leads to potential interference issues with the Uu interface, which are not addressed in existing technologies, and there is a need for a unified solution applicable to various scenarios including massive MIMO and LTE multi-antenna systems to reduce complexity and costs.
Innovation Solution
A method and device for beamforming-based transmission in sidelink that ensures no interference between cellular and sidelink communications by using a unified solution, where a first identifier determines both the cellular and sidelink beams, and the first identifier is associated with a second identifier set to ensure Quasi Co-located Reference Signal resources are not spatially related, allowing simultaneous transmission without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming is introduced in V2X transmissions, then transmission quality and directionality are improved, but interference between different beams and with the Uu interface increases
Solution Approach 1:
The patent uses Quasi Co-located (QCL) reference signals as an intermediary mechanism to coordinate beamforming operations. By establishing QCL relationships between reference signals in different links, the system mediates the beamforming process to ensure that beams are properly aligned and spaced, thereby maintaining transmission quality while preventing harmful interference between beams and with the Uu interface.
Solution Approach 2:
The patent changes the parameter of reference signal configuration by introducing QCL relationships and associating identifiers across different links. By modifying how reference signals are configured and associated (through TCI states and identifier mappings), the system optimizes beamforming parameters to achieve high transmission quality while controlling interference levels.
2Productivity
If beamforming-based transmission is implemented in sidelink, then spectrum efficiency is improved, but system complexity increases
Solution Approach 1:
The patent applies universality by using the same QCL reference signal mechanism and identifier association approach for both cellular (Uu) and sidelink communications. This multi-functional approach allows the system to achieve beamforming-based spectrum efficiency improvements while avoiding the need for separate complex control mechanisms, thereby limiting the increase in system complexity.
Solution Approach 2:
The patent implements preliminary action by pre-configuring QCL relationships and identifier associations before actual beamforming transmission occurs. By establishing these relationships in advance through RRC signaling and MAC CE commands, the system prepares the beamforming framework beforehand, which simplifies the real-time transmission process and reduces operational complexity.
3Object-generated harmful factors
If identifiers are associated across cellular and sidelink channels, then interference is reduced, but signaling overhead increases
Solution Approach 1:
The patent merges the identifier management of cellular and sidelink channels by using the same TCI state identifiers and QCL reference signal associations across both links. This combining approach reduces interference through coordinated beam management while minimizing signaling overhead by reusing identifier spaces rather than creating separate identifier systems for each link.
Data Source
AI summary
The present disclosure provides a method and a device in a node for wireless communications. A node firstly receives a first signaling in a first link; and operates a first signal in a first link and transmits a second signal in a second link; the first signaling is used to determine a first identifier, the first identifier being used to indicate a first reference signal resource; the first reference signal resource is used to determine a spatial filter for a DMRS for a channel occupied by the first signal; the first identifier is used to determine a second identifier set; the second identifier set comprises a second identifier, the second identifier being used to indicate a second reference signal resource. The present disclosure improves the method and device for sidelink TCI design to optimize the system performance.