Radio Relay Handover for Base Station Load Distribution
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Solution Overview
Problem
In high-load conditions, the throughput of radio terminals connected to a radio relay station declines due to the high load on the connected radio base station, even when the radio quality between the terminal and the relay station is excellent.
Innovation Solution
A radio communication system that includes a radio base station and a radio relay station, which implements handover mechanisms to distribute load by switching connection destinations when the base station load exceeds a threshold, prioritizing relay station handover over terminal handover, and using load and quality notifications to determine optimal handover candidates and execute handovers to alleviate base station load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay transmission is used to extend coverage and improve communication conditions, then the throughput of radio terminals in coverage holes is improved, but the load on the radio base station increases causing throughput degradation when load is high
Solution Approach 1:
The patent implements dynamic handover control where the radio base station monitors its load condition and dynamically decides whether to perform relay station handover or terminal handover. When load exceeds a threshold, the system dynamically switches to handover mode to redistribute traffic, thereby maintaining both communication quality and throughput under varying load conditions.
Solution Approach 2:
The system changes the operational parameter of connection topology by switching between direct connection mode (when load is low) and handover mode (when load is high). This parameter change allows the system to adapt to different load conditions, preventing throughput degradation while maintaining communication reliability.
2Productivity
If handover control is implemented to distribute load, then throughput is improved, but system complexity increases due to additional control mechanisms
Solution Approach 1:
The radio base station autonomously monitors its own load condition and makes handover decisions without requiring complex external control mechanisms. The system serves itself by internally managing load distribution through handover, reducing overall system complexity while maintaining throughput improvement.
Solution Approach 2:
The system implements a feedback mechanism where the radio base station continuously monitors load conditions and uses this feedback to trigger handover operations. This closed-loop control simplifies the decision-making process by relying on real-time load information, avoiding the need for complex predictive algorithms while still achieving load distribution and throughput improvement.
Data Source
AI summary
A radio communication system (1) is disclosed, in which a relay node (200) is connected to a radio base station (100A), radio terminals (300E-300G) are connected to the relay node (200), and the communication between each of the radio terminals (300E-300G) and the radio base station (100A) is relayed by the relay node (200). When the base station load, which is the load of the radio base station (100A), has exceeded a threshold value, the radio base station (100A) transmits, to the relay node (200), either the command of a relay handover in which the relay node (200) changes its connecting destination or the command of a terminal handover in which any one of the radio terminals (300E-300G) changes its connecting destination. The relay node (200) executes the relay handover in a case of receipt of the relay handover command from the radio base station (100A) or transfers the terminal handover command in a case of receipt of the terminal handover command from the radio base station (100A).