Radio Base Station Carrier Shutdown via Power Reduction
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Solution Overview
Problem
Existing radio base station technologies face challenges in turning off the output power for a frequency carrier with minimal disturbance to active users, especially when higher order modulations are used, leading to increased call drops and congestion in random access control channels.
Innovation Solution
The method involves using multiple modulation schemes in a radio base station, gradually reducing the output power spectrum density and disabling the modulation scheme with the highest required power density before turning off the output power, allowing for a controlled handover of users to alternative cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the output power of a frequency carrier is turned off suddenly for maintenance, then the maintenance operation can be performed, but all active UEs in the cell will lose connections and start searching for alternative cells, leading to congestion in random access control channels and increased disconnection times
Solution Approach 1:
The system performs preliminary actions by gradually reducing the output power spectrum density before completely turning off the frequency carrier. This gradual reduction allows UEs to detect the power decrease and initiate handover procedures to neighboring cells in advance, preventing sudden connection losses and random access channel congestion when maintenance is performed
Solution Approach 2:
The system dynamically adjusts the output power spectrum density from a high initial value through gradual reduction to a low final value before turning off the carrier. This dynamic power adjustment process enables continuous adaptation during the transition period, allowing UEs to smoothly migrate to alternative cells while maintaining connection stability
2Reliability
If the output power is gradually reduced before turning off to trigger handovers, then fewer UEs remain connected and call-drop rates are reduced, but the maintenance operation is delayed due to the gradual reduction process
Solution Approach 1:
The system changes the output power spectrum density parameter from its initial value through a controlled gradual reduction process to a lower value before complete shutdown. This parameter change triggers UEs to perform handovers based on power measurements, reducing call-drop rates while the process is optimized to minimize maintenance setup time
3Adaptability or versatility
If multiple modulation schemes are used with different power spectrum density requirements, then the system can optimize for different service requirements, but the complexity of power management increases when turning off the carrier
Solution Approach 1:
The system segments the modulation schemes based on their power spectrum density requirements, identifying which schemes require higher power and which require lower power. This segmentation allows the system to selectively disable appropriate modulation schemes during the gradual power reduction process, managing complexity through structured categorization
Data Source
AI summary
The present invention relates to a method and arrangements in a radio base station for turning off the output power for a frequency carrier of a cell. The radio base station is configured to use at least two different modulation schemes. Each of the modulation schemes requires a different output power spectrum density for the frequency carrier. The method in the radio base station comprises reducing (410) the available output power spectrum density for the frequency carrier gradually, and disabling (420) the modulation scheme with the highest required output power spectrum density, before the available output power spectrum density falls below said highest required output power spectrum density. It also comprises turning off (430) the output power for the frequency carrier before the available output power spectrum density falls below the highest required output power spectrum density of the at least one remaining non-disabled modulation scheme.