UE Beam Sweeping Using Orthogonal Scrambling Codes
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Solution Overview
Problem
In high mobility environments, traditional beam sweeping operations in wireless communication systems are often incomplete due to the time required to sweep multiple beams, which can be obsolete before completion, especially at high speeds or angular speeds.
Innovation Solution
A method is introduced where a user equipment (UE) configures orthogonal scrambling codes for its antenna panels and performs a beam sweeping operation using a set of high-level beams, specifically the narrowest beams in the hierarchy, to quickly measure signal strength across multiple beams simultaneously, allowing for faster beam selection and communication establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional beam sweeping operations are performed using multiple beams in sequence, then comprehensive beam coverage is achieved, but the time required for beam sweeping increases, causing beams to become obsolete before completion in high mobility environments
Solution Approach 1:
The patent applies partial action by performing beam sweeping only on high-level beams (coarse granularity) rather than all beams in the hierarchy. This selective approach reduces the number of beams that need to be swept while still achieving sufficient beam selection accuracy for high mobility scenarios, thereby reducing time loss without completely sacrificing reliability.
Solution Approach 2:
The patent segments the beam hierarchy into high-level beams (coarse granularity) and lower-level beams (fine granularity). By performing beam sweeping only on the high-level segment and using the selected high-level beam for communication, the system avoids the time-consuming process of sweeping all beams while maintaining acceptable performance in high mobility environments.
2Loss of time
If beam sweeping is performed quickly using high-level beams only, then time loss is reduced and beams remain valid, but the precision of beam selection may be insufficient
Solution Approach 1:
The patent performs beam sweeping partially on high-level beams only, accepting reduced precision in exchange for significantly reduced time loss. In high mobility scenarios, this partial approach is sufficient because the beam selection needs to be good enough for current communication, and finer precision would only add unnecessary time delays.
Solution Approach 2:
The patent dynamically adapts the beam sweeping granularity based on mobility conditions. For high mobility scenarios, it uses coarse high-level beams for quick selection. The system can transition between different beam hierarchy levels dynamically, adjusting the measurement precision to match the current mobility state and time constraints.
3Measurement precision
If lower level beam refinement is performed to improve beam selection precision, then measurement precision is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent segments the beam processing into two distinct stages: high-level beam sweeping (coarse selection) and optional lower-level beam refinement (fine selection). By default, only the high-level segment is performed, reducing device complexity. The lower-level refinement segment can be optionally activated when time permits and higher precision is needed, allowing the system to manage complexity dynamically.
Solution Approach 2:
The patent applies partial action by performing only the necessary portion of beam refinement based on system conditions. When time is constrained or mobility is high, it performs only high-level beam sweeping, avoiding the excessive complexity of full lower-level refinement. This selective approach optimizes the balance between precision and complexity.
Data Source
AI summary
An apparatus (e.g., a UE) may be configured to configure a plurality of orthogonal scrambling codes corresponding to a plurality of antenna panels of the UE and perform, for a first SSB transmission, a beam sweeping operation over a set of first beams for each antenna panel in the plurality of antenna panels, where, for a transmitted first signal in each symbol of the first SSB transmission, each antenna panel in the plurality of antenna panels receives the transmitted first signal via a beam in the set of first beams using an orthogonal scrambling code in the plurality of orthogonal scrambling codes corresponding to the antenna panel.