Random Access Power Control in Multi-Cell Heterogeneous Networks
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Solution Overview
Problem
Current mobile communication systems face challenges in power control for random access preambles when multiple cells or transmission/reception points coexist, leading to signal collisions and inefficient data transmission.
Innovation Solution
A method for setting and controlling random access transmission power by a base station and User Equipment (UE) to optimize power settings for uplink random access, involving the transmission of downlink signals with power information and indication of random access to a second base station, allowing for effective power control in multi-cell environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a typical power control scheme is used in a multi-cell environment, then the system structure remains simple, but signal collisions occur and transmission efficiency deteriorates
Solution Approach 1:
The power control scheme is segmented into cell-specific components, where each cell independently determines and signals its random access preamble transmission power parameters to UEs. This allows differentiated power control for each cell while maintaining overall system coordination, resolving the contradiction between transmission efficiency and scheme complexity.
Solution Approach 2:
The patent implements local quality by allowing each cell to have its own power control parameters (preambleInitialReceivedTargetPower, powerRampingStep) tailored to specific cell conditions such as path loss and interference levels. This localized optimization improves transmission efficiency without requiring complete redesign of the overall power control architecture.
2Reliability
If random access preamble transmission power is not properly controlled, then device operation remains simple, but signal collisions increase and reliability deteriorates
Solution Approach 1:
The base station performs preliminary action by pre-calculating and signaling the appropriate random access preamble transmission power parameters to UEs before the actual random access attempt. This includes providing preambleInitialReceivedTargetPower and powerRampingStep values that guide UE power control, thereby improving random access reliability while keeping UE operation simple.
Solution Approach 2:
The patent implements feedback mechanisms where the base station monitors random access success rates and adjusts power control parameters accordingly. The base station signals updated power parameters to UEs based on observed collision patterns and path loss conditions, improving reliability while maintaining ease of operation through automated adjustments.
Data Source
AI summary
The present disclosure relates to a method and a device for random access power control. Such a method for random access power control present disclosure may include setting, by a first base station, random access preamble transmission power required for a random access of a terminal with a second base station and transmitting by the first base station, to the terminal, a downlink signal including information on the set transmission power and information indicating the random access of the second base station.