FR2 Sidelink Beam Tracking Using Special-Slot Beam Sweeping
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Solution Overview
Problem
FR2 sidelink communications face challenges in beam tracking due to high mobility and line of sight obstructions, which affect link quality and throughput in mobile scenarios.
Innovation Solution
A novel beam tracking procedure for FR2 sidelink systems that involves beam measurement reference signals and special slots within resource pools for beam sweeping, allowing UEs to dynamically adjust beam direction and switch to higher quality beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming is used in FR2 sidelink communications to expand bandwidth and increase data rate, then data rate is improved, but beam tracking becomes more difficult due to high mobility and line of sight obstructions
Solution Approach 1:
The patent applies preliminary action by performing beam sweeping and beam measurement reference signal transmission before actual data communication. The transmitting UE sweeps through multiple beams in advance to identify suitable beams, and the receiving UE performs measurements on these beams beforehand. This preliminary beam establishment enables subsequent high-rate communication without requiring complex real-time beam tracking during data transmission, thus resolving the contradiction between high data rate and beam tracking complexity.
2Reliability
If beam tracking is performed continuously to maintain link quality in mobile scenarios, then link quality is improved, but latency increases due to the need for dynamic beam adjustment
Solution Approach 1:
The patent implements periodic action through configured beam measurement reference signals that are transmitted at regular intervals rather than continuously. The beam sweeping and measurement processes are performed periodically according to pre-configured parameters, allowing the system to maintain link quality through regular beam assessments while avoiding the latency penalties of continuous real-time beam tracking. This periodic approach balances reliability maintenance with time efficiency.
3Measurement precision
If multiple beam measurement reference signals are transmitted to cover all possible beam directions, then beam selection accuracy is improved, but resource overhead increases
Solution Approach 1:
The patent applies local quality by configuring beam measurement reference signals with different parameters for different spatial regions and scenarios. Instead of uniformly transmitting comprehensive beam measurements in all directions, the system adjusts the number, direction, and density of beam measurement reference signals based on local conditions such as UE mobility, spatial distribution, and channel characteristics. This localized optimization achieves sufficient beam selection accuracy while minimizing unnecessary resource overhead in each specific context.
Data Source
AI summary
A system and a method are disclosed for configuring one or more user equipment (UE) devices in a multi-UE arrangement to communicate according to a preferred frequency range 2 (FR2) sidelink (SL) configuration. The systems and method involve determining, by a first user equipment (UE), one or more beam measurement reference signals corresponding to one or more beamform configurations from a special slot within a regular resource pool and relating to one or more beamform configurations and configuring the first UE, based at least in part on the one or more beam measurement reference signals, to transmit and receive FR2 SL transmissions with the second UE according to at least a beamform configuration of the one or more beamform configurations.