User Equipment RACH Parameter Optimization via Feedback
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Solution Overview
Problem
Current user equipment in 5G New Radio (NR) systems faces challenges in accurately optimizing random access channel (RACH) parameters, which affects network performance and efficiency.
Innovation Solution
The user equipment (UE) includes a control unit and a transmitting unit that reports RACH-related parameters such as synchronization signal block quality, group of random access preambles, and power ramping information to the network, enabling more precise automated optimization of RACH parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE selects an SSB with RSRP larger than a threshold value and transmits a random access preamble, then the random access procedure can be initiated, but the accuracy of RACH parameter optimization is insufficient
Solution Approach 1:
The patent implements feedback by having the UE report RACH-related information (selected SSB index, RSRP values, preamble group, power ramping count) to the base station after completing the random access procedure. This feedback enables the base station to accurately optimize RACH parameters based on actual UE measurements and procedure outcomes, directly resolving the information loss problem and improving optimization accuracy.
Solution Approach 2:
The patent applies preliminary action by having the UE measure and select SSBs based on RSRP thresholds before initiating the random access procedure. The UE prepares measurement results and selects appropriate preambles in advance, which provides the base station with preliminary data for more accurate parameter optimization decisions.
2Reliability
If the number of RA Preambles assigned to each SSB is increased, then the probability of successful random access increases, but the network resource consumption increases
Solution Approach 1:
The patent implements dynamics by enabling the base station to dynamically adjust the number of RA Preambles assigned to each SSB based on feedback from multiple UEs about their selected SSBs, RSRP measurements, and random access outcomes. This dynamic adjustment allows the system to optimize preamble allocation in real-time, increasing success probability for heavily loaded SSBs while conserving resources for lightly loaded ones.
Solution Approach 2:
The patent applies parameter changes by modifying the RACH configuration parameters (number of preambles per SSB, RSRP thresholds, power ramping limits) based on aggregated feedback from UEs. The base station changes these parameters adaptively to balance access success rates with resource consumption, resolving the contradiction between reliability and resource usage.
3Reliability
If power ramping is performed multiple times to ensure successful random access, then the access reliability improves, but the random access procedure time increases
Solution Approach 1:
The patent applies preliminary action by having UEs measure RSRP of multiple SSBs and select the most appropriate SSB and preamble group before initiating the random access procedure. This preliminary measurement and selection process reduces the likelihood of failed access attempts, thereby reducing the need for repeated power ramping and shortening the overall procedure time while maintaining high reliability.
Solution Approach 2:
The patent implements dynamics by enabling the base station to dynamically adjust power ramping parameters and SSB/preamble assignments based on feedback from UEs about their access attempts and successes. This dynamic optimization allows the system to minimize unnecessary retransmissions and power ramping iterations, balancing access reliability with procedure time efficiency.
Data Source
AI summary
A UE (200) performs a random access procedure with a gNB (100). The UE (200) transmits to a network via a radio base station at least one of a synchronization signal block used for performing the random access procedure, a reception quality in the synchronization signal block, a group of random access preambles, and number of times for which power ramping was performed in the random access procedure.