PRACH Resource Configuration for REDCAP Devices
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Solution Overview
Problem
Current methods for determining PRACH resources in REDCAP NR devices fail to accurately represent coverage enhancement requirements due to variations in the number of antennas used for RSRP measurement, leading to unstable signal transmission and inefficient power consumption.
Innovation Solution
A method where PRACH resources are determined based on both the number of antennas and channel measurement results, adjusting RSRP threshold ranges to ensure accurate coverage enhancement levels, thereby reducing deviations and improving resource selection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PRACH resources are determined based only on channel measurement results without considering the number of antennas, then the determination process is simple, but the accuracy of coverage enhancement requirements is poor
Solution Approach 1:
The patent applies parameter changes by introducing the number of antennas as an additional parameter for determining PRACH resources. Different antenna configurations (1 antenna, 2 antennas, 4 antennas) are associated with different RSRP threshold ranges, allowing the system to adapt the resource selection criteria based on the specific antenna capability of the REDCAP NR device. This resolves the contradiction by improving measurement precision through parameter differentiation while maintaining a structured determination process.
2Reliability
If coverage enhancement level is determined without considering antenna variations, then the resource selection process is simple, but signal transmission stability is poor
Solution Approach 1:
The patent applies local quality by assigning different RSRP threshold ranges to different antenna configurations. Each antenna scenario (1, 2, or 4 antennas) has its own specific threshold values, allowing the system to tailor the coverage enhancement determination to the local characteristics of the device's antenna capability. This ensures reliable signal transmission by matching the resource selection criteria to the specific hardware configuration.
3Reliability
If inappropriate PRACH resources are selected, then resource selection is fast, but power consumption increases and signal transmission becomes unstable
Solution Approach 1:
The patent uses parameter changes to establish different RSRP threshold ranges for different antenna configurations, enabling accurate identification of coverage enhancement requirements. By correctly matching PRACH resources to the device's antenna capability and channel conditions, the system avoids both over-enhancement (wasting power) and under-enhancement (causing transmission failures), thus optimizing the trade-off between reliability and power consumption.
Data Source
AI summary
A method for resource configuration is performed by a user equipment (UE), and includes: determining physical random access channel (PRACH) resources based on a number of antennas of the UE and a channel measurement result.