RACH Procedure Selection Using MPE-Adjusted RSRP Thresholds
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Solution Overview
Problem
Conventional random access channel (RACH) procedure selection in wireless communications systems is inefficient due to reliance on unreliable reference signal received power (RSRP) metrics, which fail to account for maximum permissible exposure (MPE) restrictions, leading to suboptimal procedure selection and performance.
Innovation Solution
A user equipment (UE) dynamically selects between two-step and four-step RACH procedures based on exposure conditions, using MPE restrictions and SSB-based RSRP thresholds to adjust transmission power and procedure choice, ensuring compliance with MPE regulations and optimizing channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional RACH procedure selection based on RSRP metrics is used, then the selection process is simple, but the reliability of procedure selection deteriorates due to failure to account for MPE restrictions
Solution Approach 1:
The UE determines MPE restrictions and selects appropriate RSRP thresholds before performing RACH procedure selection. This preliminary determination of exposure conditions and corresponding threshold selection ensures that the RACH procedure selection accounts for MPE restrictions from the outset, improving reliability without adding significant complexity to the selection process itself.
2Reliability
If MPE restrictions are accounted for in RACH procedure selection, then the reliability of procedure selection improves, but the complexity of the selection process increases
Solution Approach 1:
The patent changes the parameter used for RACH procedure selection from a single RSRP threshold to multiple RSRP thresholds corresponding to different MPE restriction conditions. The UE determines its MPE restriction status and selects the appropriate threshold from the set, enabling reliable procedure selection that accounts for exposure conditions while maintaining a systematic and manageable selection process.
3Object-affected harmful factors
If UE transmits at lower power to comply with MPE restrictions, then MPE compliance is achieved, but the performance of RACH procedure deteriorates
Solution Approach 1:
The UE dynamically adapts its RACH procedure selection based on real-time MPE restriction conditions. When MPE restrictions are detected, the UE selects from a set of RSRP thresholds specifically configured for restricted power conditions, ensuring that the procedure selection is optimized for the current transmission power level. This dynamic adaptation maintains RACH performance despite lower transmission power requirements.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some implementations, a UE may determine that a maximum permissible exposure (MPE) restriction applies to UE transmissions, and the UE may transmit at a lower power to meet the restriction. The UE may be configured to account for lower power transmission when selecting between a two-step or a four-step random access channel (RACH) procedure. In some cases, the UE may identify a RACH procedure selection rule for selecting between the two-step RACH procedure and the four-step RACH procedure based on whether an exposure condition (e.g., MPE restriction) is identified. The selection rule may indicate one or more synchronization signal block based reference signal received power thresholds to be used by the UE to select between the two-step RACH procedure and four-step RACH procedure. The UE may perform the selected RACH procedure.