Mobile-to-Mobile Beam Management in mmW V2X
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Solution Overview
Problem
In millimeter wave (mmW) vehicle-to-everything (V2X) communications, establishing and maintaining aligned transmit/receive beams is challenging due to the mobility of both transmitter and receiver, which affects the stability and efficiency of beam management in 5G networks.
Innovation Solution
A mobile-to-mobile beam management approach is proposed, where synchronization signal block (SSB) transmitters and receivers adapt beam directions based on quasi-collocation (QCL) flags and windows, allowing for dynamic adjustment of beam associations to maintain communication links even when the gNB is mobile, by transmitting and receiving SSBs on different beam directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming is used to compensate for high path loss in mmW communications, then data transfer rates are improved, but beam alignment stability deteriorates due to transmitter and receiver mobility
Solution Approach 1:
The patent implements dynamic beam management where the receiver continuously monitors beam alignment quality and triggers realignment procedures when degradation is detected. The system adapts beam directions in real-time based on mobility conditions, transitioning from static beamforming to dynamic beam tracking to maintain both high data rates and alignment stability
Solution Approach 2:
The patent establishes a feedback mechanism where the receiver measures beam alignment quality and communicates this information back to the transmitter. This feedback loop enables the transmitter to adjust beam directions based on actual channel conditions, resolving the contradiction between maintaining high throughput and adapting to mobility-induced alignment changes
2Productivity
If directional beam communication is used to achieve high data rates, then communication efficiency is improved, but the complexity of beam management increases due to need for accurate alignment
Solution Approach 1:
The patent implements self-service beam management where the receiver autonomously determines beam alignment quality and triggers realignment procedures without requiring complex centralized control. The system uses locally available measurements and pre-configured beam patterns to perform beam adjustments, reducing the complexity of beam management while maintaining high communication efficiency
3Reliability
If beam realignment procedures are frequently performed to maintain alignment under mobility, then beam alignment stability is improved, but loss of time increases due to interruption of data transfer
Solution Approach 1:
The patent applies partial realignment actions by adjusting only the necessary beam parameters rather than performing complete beam sweeps. The system uses incremental beam adjustments based on measured alignment degradation, performing minimal necessary realignment to maintain stability while reducing the time lost to realignment procedures
Data Source
AI summary
Disclosed are techniques for transmit/receive (TX/RX) beam association in millimeter wave (mmW) vehicle-to-everything (V2X) communications. In conventional wireless systems, a node (e.g., gNB) that manages wireless resources is typically stationary. This means that transmissions from the network node over the same TX beam using the same antenna array orientation can be assumed to be quasi-collocated (QCLed) and communications may be established using fixed-to-mobile beam management approach. However, if the transmitting node is mobile, a quasi-collocation (QCL) assumption may not be valid. To address issues due to mobility of the nodes that manage wireless resources, a mobile-to-mobile beam management approach is proposed.