Sidelink Beam Training Scheduling for Resource Conflict Reduction
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Solution Overview
Problem
In sidelink scenarios of the NR system, the reliability and effectiveness of beam training are reduced due to the transmit and receive ends being terminal devices, leading to reduced reliability and effectiveness of beam training, especially in scenarios like V2X communication where terminal devices may be communicating with multiple other devices, causing resource conflicts and half-duplex issues.
Innovation Solution
A sidelink beam training method that involves determining K first occasions with P time units for sending N beams, allowing the receive end to perform beam training with consistent understanding of time domain resources, and selecting unoccupied or minimally overlapping occasions to reduce resource conflicts and improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminal devices perform beam training in sidelink scenarios, then beamforming capability is enabled, but resource conflicts and half-duplex issues reduce reliability and effectiveness
Solution Approach 1:
The patent segments the beam training process into multiple occasions (first occasion, second occasion, etc.) with different time domain resources. Each occasion contains multiple time units for sending different beams. This segmentation allows the transmit end to send beams in an ordered manner across different occasions, reducing resource conflicts by distributing beam training transmissions across multiple time slots rather than concentrating them in a single resource block.
Solution Approach 2:
The patent implements preliminary sensing before beam training transmission. The transmit end performs sensing to detect whether time domain resources are occupied by other devices before selecting resources for beam training. This preliminary action prevents resource conflicts by avoiding already-occupied resources, thereby improving the reliability and effectiveness of beam training in sidelink scenarios.
2Productivity
If terminal devices send beams simultaneously in sidelink, then communication efficiency increases, but half-duplex issues reduce beam training effectiveness
Solution Approach 1:
The patent employs periodic action by structuring beam training transmissions in periodic occasions with defined time units. Each occasion contains multiple time units for sending different beams in sequence. This periodic structure ensures that beams are sent in an ordered, non-conflicting manner across time, maintaining communication efficiency while avoiding half-duplex issues through proper time domain resource allocation.
3Speed
If multiple beams are sent in the same time unit, then beam training speed increases, but resource conflicts increase
Solution Approach 1:
The patent resolves resource conflicts by transitioning from a single-time-unit transmission approach to a multi-dimensional time domain structure. Instead of sending multiple beams in the same time unit (one-dimensional approach), the patent distributes beams across multiple time units within different occasions (multi-dimensional approach). This dimensional expansion in the time domain allows faster beam training while avoiding resource conflicts through proper temporal separation.
Data Source
AI summary
A sidelink beam training method and apparatus. The method includes: determining K first occasions, where each of the K first occasions includes P time units, the P time units include N sending time units, K, P, and N are all positive integers greater than 1, and N is less than or equal to P; determining a first target occasion from the K first occasions; and sending N first beams in the N sending time units of the first target occasion, where the N first beams carry a first sidelink signal, and the first sidelink signal is used for beam training. According to the foregoing method, reliability and effectiveness of sidelink beam training can be improved.