Femto Base Station LDO Cycle Management for Interference Control
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Solution Overview
Problem
Current femto base station operation methods lack detailed descriptions for switching conditions and LDO cycle determination, leading to inefficient management in mobile wireless access systems supporting femto-cells.
Innovation Solution
A method for femto base station operation that involves transmitting LDO pattern information, including AI and UAI lengths, and using modulo calculations to set the start of the LDO cycle, with the ability to adjust cycles based on user equipment and system information, and switching to normal operation mode upon receiving specific request signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the femto BS operates in LDO mode with fixed AI and UAI intervals, then interference with neighbor cells is minimized, but the system cannot adapt to varying communication environments and UE requirements
Solution Approach 1:
The patent applies dynamics by making the AI and UAI intervals variable rather than fixed. The femto BS dynamically adjusts the LDO cycle parameters based on real-time conditions such as UE presence, traffic patterns, and network load. This allows the system to adapt to varying communication environments while maintaining interference minimization during UAI periods.
Solution Approach 2:
The patent changes the parameters of the LDO cycle by allowing AI and UAI lengths to be dynamically modified. The system can adjust these parameters based on communication requirements, UE mobility patterns, and network conditions, transforming a static operation mode into a flexible adaptive mechanism.
2Reliability
If the femto BS continuously monitors all UEs in normal operation mode, then service quality is maintained, but energy consumption increases and interference with neighbor cells increases
Solution Approach 1:
The patent implements periodic action through the LDO mode, where the femto BS alternates between active monitoring periods (AI) and inactive periods (UAI). During UAI, the BS stops transmitting and receiving signals, significantly reducing energy consumption and interference while maintaining service quality through periodic check-ins during AI periods.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining the LDO cycle as a repeating pattern of AI and UAI intervals. This continuous cycling allows the system to maintain service quality through regular monitoring while achieving energy savings during inactive periods, balancing reliability and energy efficiency.
3Object-affected harmful factors
If the LDO cycle is set with long AI and UAI intervals, then the BS can minimize interference and save energy, but the response time to UE requests increases
Solution Approach 1:
The patent applies dynamics by allowing the AI and UAI intervals to be adjusted based on real-time conditions. When UE requests are detected or network conditions require faster response, the system can shorten the UAI interval or extend the AI interval, dynamically balancing interference minimization with response time requirements.
Solution Approach 2:
The patent implements feedback mechanisms where the femto BS monitors UE status, traffic conditions, and network load to adjust LDO cycle parameters. This feedback loop allows the system to respond to changing conditions by modifying AI and UAI lengths, ensuring adequate response time while maintaining interference minimization during normal operation.
Data Source
AI summary
A method for opearation of femto base station (BS) is provided. The method includes: transmitting the first low duty operation (LDO) pattern information, which includes length information of an available interval (AI) where the femto BS is activated and length information of an unavailable interval (UAI) where the femto BS is inactivated, to user equipment (UE) and operating based on the first LDO pattern where the first LDO cycle, a sequence of the AI and the UAI, is repeatedly arranged. The first LDO pattern information further including a superframe offset as information for leading a start point of the first LDO cycle.