Adaptive Random Access Power Control for LTE Delay
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Solution Overview
Problem
In LTE systems, the fixed random access power control parameters for user equipment (UE) lead to uncontrollable delays during the random access process, as they cannot be adaptively adjusted according to actual needs.
Innovation Solution
An apparatus and method that collect random access information from multiple UEs, determine probabilities of successful random access, and adjust power control parameters such as preamble initial received target power and power ramping step to optimize the random access process, ensuring the delay is within an expected range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed random access power control parameters are used, then the system is simple to operate, but the delay in random access process becomes uncontrollable
Solution Approach 1:
The patent implements dynamic adjustment of random access power control parameters by introducing a parameter adjustment module that modifies parameters such as preambleInitialReceivedTargetPower and powerRampingStep based on real-time random access success rates and path loss conditions. This transforms the static parameter configuration into a dynamic adaptive system that responds to changing channel conditions and access traffic patterns.
Solution Approach 2:
The patent establishes a feedback mechanism where the base station collects random access information from multiple UEs, calculates random access success rates, and uses this feedback to adjust power control parameters. The feedback loop continuously monitors access performance and modifies parameters to maintain optimal random access delay within expected ranges.
2Device complexity
If fixed power control parameters are used, then the device complexity is low, but the adaptability to actual needs is poor
Solution Approach 1:
The patent implements a self-service mechanism where the base station autonomously adjusts power control parameters based on observed random access performance. The system automatically collects UE random access information, calculates success rates, determines appropriate parameter adjustments, and applies modifications without requiring manual intervention, thereby achieving high adaptability with controlled complexity.
Solution Approach 2:
The patent changes key power control parameters including preambleInitialReceivedTargetPower, powerRampingStep, and deltaPreamble based on calculated random access success rates and path loss conditions. This parameter adaptation enables the system to respond to varying channel conditions and traffic patterns while maintaining manageable complexity through standardized adjustment algorithms.
3Loss of time
If adaptive adjustment of power control parameters is implemented, then the delay control in random access process is improved, but the device complexity increases
Solution Approach 1:
The patent segments the parameter adjustment process into distinct functional modules: a random access information obtaining module that collects UE data, a statistics collecting module that aggregates access attempts and successes, a probability determining module that calculates success rates, and a parameter adjustment module that modifies control parameters. This segmentation manages complexity by organizing the adaptive control function into manageable, specialized components.
Solution Approach 2:
The patent introduces intermediary computational elements including path loss calculation modules that determine channel conditions, random access success rate calculators that assess performance, and threshold comparison mechanisms that trigger parameter adjustments. These intermediaries mediate between raw observed data and final parameter modifications, enabling controlled adaptation without excessive complexity.
Data Source
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AI summary
The present invention provides an apparatus and a method for adjusting a control parameter, which can adaptively adjust a power control parameter and further control a delay of UE in a random access process to be within an expected range. The method in the present invention includes: obtaining, by a base station, random access information reported by multiple user equipments UEs, where the random access information includes a contention conflict indication and a quantity of times of sending a preamble; collecting, by the base station, statistics on the random access information whose contention conflict indication indicates a non-contention conflict; determining, by the base station, a first random access probability according to the random access information whose contention conflict indication indicates a non-contention conflict, where the first random access probability represents a probability of random access in which the quantity of times of sending a preamble is 1; and adjusting, by the base station, a first random access power control parameter according to the first random access probability, where the first random access power control parameter is a preamble initial received target power.