Dynamic Panel Switching in Random Access Procedures
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Solution Overview
Problem
Current wireless communication networks face challenges in efficiently managing random access procedures across multiple transmission reception points (TRPs) and panels, leading to suboptimal performance due to complexities in beam management and resource allocation.
Innovation Solution
The implementation of a method that enables dynamic panel switching and resource allocation strategies within the random access procedure, utilizing advanced beam management techniques and CSI-RS mapping to optimize channel state information and improve uplink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional random access procedures are used in multi-TRP/multi-panel networks, then implementation simplicity is maintained, but access efficiency and reliability deteriorate due to inability to handle multiple panels and beam management complexities
Solution Approach 1:
The patent segments the random access procedure into distinct phases: panel determination phase where the UE identifies which panel to use based on downlink beam measurements, and random access execution phase where the selected panel transmits preamble and receives response. This segmentation separates the complex beam management logic from the standard random access流程, improving access efficiency while managing complexity through structured separation of concerns.
Solution Approach 2:
The patent implements preliminary beam measurement and panel determination actions before the actual random access procedure. The UE measures downlink reference signals (CSI-RS or SSB) from multiple TRPs in advance, determines the optimal panel for uplink transmission, and prepares the selected panel for random access. This preliminary action ensures that when random access is triggered, the UE already has the optimal panel identified, improving access efficiency without adding complexity during the critical access moment.
2Reliability
If multiple panels are activated for random access, then access reliability improves through diversity, but resource allocation complexity increases
Solution Approach 1:
The patent implements dynamic panel selection where the UE determines which panel to use for random access based on real-time downlink beam measurements and channel conditions. The selected panel can change dynamically depending on the measured signal quality from different TRPs. This dynamic approach provides reliability through diversity while managing resource allocation complexity by activating only one panel at a time for the random access procedure, rather than simultaneously managing multiple panels.
Solution Approach 2:
The patent changes the panel selection parameter based on downlink measurement results. The UE measures reference signal received power (RSRP) or other channel quality metrics from multiple TRPs, and selects the panel associated with the TRP having the best measurement. This parameter-based selection mechanism improves reliability by adapting to channel conditions while simplifying resource allocation compared to fixed multi-panel activation, as only the selected panel's resources are allocated for the random access procedure.
3Measurement precision
If panel-specific random access resources are allocated, then access precision improves, but network configuration complexity increases
Solution Approach 1:
The patent implements a universal random access resource allocation mechanism where the same physical random access channel (PRACH) resources can be used by multiple panels, but the UE selects which panel to use based on beam measurements. The network configures panel-specific parameters (such as panel IDs and associated TRP identifiers) that guide the UE's selection, rather than allocating completely separate physical resources for each panel. This universal approach improves beam alignment precision through accurate panel selection while reducing network configuration complexity compared to dedicated per-panel resource allocation.
Data Source
AI summary
A wireless device transmits a first preamble of a random access procedure via a first antenna panel. The wireless device may also receive a random access response corresponding to the first preamble and indicating a second antenna panel. The wireless device may further switch, based on the random access response, from the first antenna panel to the second antenna panel. The wireless device transmits, via the second antenna panel, an uplink transport block for the random access procedure.