Base Station Cell State Transition for DRX Alignment
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately controlling radio measurements in terminals connected to cells in sleep or power saving states, leading to erroneous detection of radio link failures or beam failures.
Innovation Solution
A base station is designed to transition a cell to a state where downlink signal transmission is restricted, and it sends a signal to the terminal with information indicating this state transition, ensuring the measurement control in the terminal aligns with the cell's state, particularly aligning with a multiple of the terminal's discontinuous reception (DRX) cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the cell transitions to a sleep state or power saving state to reduce energy consumption, then energy efficiency is improved, but measurement accuracy deteriorates due to restricted downlink signal transmission
Solution Approach 1:
The patent applies periodic action by configuring the cell sleep cycle to be equal to or greater than a multiple of the terminal's DRX cycle. This synchronization ensures that the cell transitions to sleep state only when the terminal is in dormant period, and becomes active when the terminal needs to perform measurements, thus maintaining measurement accuracy while achieving energy savings during terminal dormant periods.
2Use of energy by moving object
If the cell transitions to a sleep state to reduce energy consumption, then energy efficiency is improved, but system reliability deteriorates due to erroneous detection of radio link failures
Solution Approach 1:
The patent implements feedback by having the base station transmit information about the cell state transition to the terminal. The terminal uses this feedback to adjust its measurement behavior, knowing when the cell is in sleep state and when it is active, thereby avoiding erroneous detection of radio link failures during sleep periods while maintaining reliable detection when the cell is active.
3Use of energy by moving object
If downlink signal transmission is restricted in sleep state to save energy, then energy efficiency is improved, but information transmission capability deteriorates
Solution Approach 1:
The patent applies dynamics by making the cell state configurable and time-dependent. The base station can dynamically adjust the cell sleep cycle and transition between active and sleep states based on traffic conditions and terminal requirements. This dynamic adjustment allows the system to optimize energy consumption while ensuring downlink signal transmission capability is available when needed.
Data Source
AI summary
A base station includes: a control unit that determines to cause a state of a cell to transition to a second state in which transmission of a downlink signal in the cell is restricted; and a transmitter that transmits, to a terminal, a first signal that includes first information that indicates that the cell is to transition to the second state, wherein a period of the second state is equal to or greater than a multiple of a cycle of a discontinuous reception (DRX) state of the terminal.