Sidelink Beam Management in 5G FR2 Using PSFCH Feedback
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G New Radio (NR), face challenges in beam management for sidelink communications in frequency range 2 (FR2), where UEs have multiple beams that cannot be simultaneously transmitted, necessitating a reliable beam management method for initial beam pairing, beam maintenance, and beam failure recovery.
Innovation Solution
The proposed solution involves a method where a first UE transmits reference signals using multiple transmission beams and receives a beam report from a second UE on a Physical Sidelink Feedback Channel, allowing the first UE to select optimal transmission and reception beams for sidelink communication. This includes configuring Channel State Information Reference Signal (CSI-RS) resource mapping and indicating its time and frequency domain locations, enabling efficient beam management and communication establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple transmission beams are used for sidelink communication in FR2, then beam coverage and communication reliability are improved, but beam management complexity and time for beam selection increase
Solution Approach 1:
The patent implements beam management through feedback mechanisms where the second UE measures reference signals from multiple transmission beams and reports beam quality metrics back to the first UE. This feedback enables the first UE to select optimal transmission and reception beams based on actual channel conditions, improving communication reliability while managing complexity through systematic information exchange.
Solution Approach 2:
The patent employs preliminary beam pairing procedures where reference signals are transmitted across multiple beams before actual data communication begins. This preliminary action allows both UEs to identify optimal beam pairs in advance, establishing reliable beam configurations that can be used for subsequent sidelink communication, thereby improving reliability without adding complexity during active communication.
2Reliability
If beam pairing procedures are performed before link establishment, then communication reliability is improved, but link establishment time increases
Solution Approach 1:
The patent performs beam pairing procedures as a preliminary step before formal link establishment between UEs. During this preliminary phase, reference signals are transmitted and measured to identify optimal beam configurations. By completing beam pairing beforehand, the patent ensures reliable beam selection is already determined when link establishment occurs, improving communication reliability while managing the time penalty through efficient pre-planning.
Solution Approach 2:
The patent implements dynamic beam management where beam configurations can be adjusted and updated during communication. This dynamic approach allows the system to adapt to changing channel conditions and maintain reliability without requiring complete re-establishment of links, effectively balancing the trade-off between reliability and establishment time through flexible, real-time beam optimization.
Data Source
AI summary
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a first UE. The first UE transmits a plurality of reference signals (RSs) using a plurality of transmission beams on a sidelink. The first UE receives, from a second UE, a beam report carried on a Physical Sidelink Feedback Channel (PSFCH). The beam report indicates beam qualities generated by the second UE based on measurements of the plurality of RSs. The first UE selects a transmission beam and a reception beam based on the beam qualities. The first UE establishes a sidelink communication with the second UE using the selected transmission beam and the selected reception beam on the sidelink.