FR2 Random Access Beam Selection on PSCell Antenna Panels
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Solution Overview
Problem
Existing wireless communication systems face challenges in rapidly establishing and maintaining high-frequency range 2 (FR2) connections at user equipment due to high path loss and short range, necessitating improved beam training and antenna panel selection techniques.
Innovation Solution
A method for user equipment (UE) to receive reference signals on a primary secondary cell group (PSCell) to measure and select an antenna panel and beam for data reception, optimizing the random access procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional random access procedure is used for FR2 connection establishment, then the connection can be established, but the process is slow and inefficient due to extensive beam training requirements
Solution Approach 1:
The UE performs antenna panel and beam selection measurements during the random access procedure itself, rather than requiring separate preliminary beam training phases. The UE measures reference signals (SSB or CSI-RS) received during random access to identify the best antenna panel and beam, completing both connection establishment and beam selection in one integrated process.
Solution Approach 2:
The patent merges the beam training function with the random access procedure. Instead of treating them as separate sequential operations, the UE utilizes the random access phase to simultaneously perform connection establishment and beam/panel selection by measuring reference signals received during this procedure, thereby reducing overall setup time.
2Reliability
If extensive beam training is performed to ensure reliable FR2 connection, then connection reliability improves, but device complexity and processing overhead increase
Solution Approach 1:
The UE performs measurements on a limited set of reference signals transmitted during the random access procedure rather than conducting exhaustive beam sweeping across all possible beams. This partial measurement approach achieves sufficient beam alignment for reliable FR2 connection without the complexity of complete beam training.
Solution Approach 2:
The random access procedure serves multiple functions simultaneously: it establishes the cellular connection and performs beam/panel selection. The reference signals transmitted during random access are used both for connection setup and for beam measurement, eliminating the need for dedicated beam training resources and reducing overall system complexity.
3Productivity
If antenna panel and beam selection is performed during random access procedure, then connection setup time is reduced, but measurement precision requirements increase
Solution Approach 1:
The network configures specific reference signal parameters (such as CSI-RS resources or SSB configurations) optimized for both random access and beam measurement purposes. By adjusting reference signal transmission parameters like power, frequency resources, and time scheduling, the system achieves sufficient measurement precision within the compressed random access timeframe.
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 UE. The UE receives, on a primary cell (PCell), an indication indicating an addition of a primary secondary cell group (SCG) cell (PSCell). The UE initiates executing a random access procedure on the PSCell. While executing the random access procedure, the UE receives one or more reference signals on the PSCell; the UE measures the one or more reference signals to select an antenna panel and a beam to receive data on the PSCell; the UE receives, at the antenna panel, the data on the beam after the random access procedure is completed.