Network Device Cell Working State Duration for UE Measurement Accuracy
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Solution Overview
Problem
User equipment experiences erroneous measurement and synchronization results due to the default assumption that small cells always send cell-specific reference signals, even when disabled, leading to inaccurate measurement and synchronization in densely deployed small cell environments.
Innovation Solution
A method and apparatus that involve a network-side device acquiring and indicating the duration of a cell's working state, including semi-static and dynamic enabled-disabled states, to inform user equipment when to perform measurement and synchronization, ensuring accuracy by aligning these tasks with the cell's signal sending periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the small cell is disabled to save energy and reduce interference, then energy consumption and signal interference are reduced, but the user equipment performs measurement and synchronization using erroneous assumptions leading to measurement accuracy degradation
Solution Approach 1:
The network side device performs preliminary action by determining the working state duration of the cell in advance and notifying the user equipment before the cell switches to disabled state. This allows the user equipment to adjust its measurement and synchronization timing proactively, ensuring accurate measurements are performed only when the cell is actually transmitting signals, thus resolving the measurement accuracy issue while maintaining energy-saving disabled states.
2Object-generated harmful factors
If the small cell is disabled when user equipment does not need service data transmission, then energy is saved and signal interference is reduced, but the user equipment cannot perform accurate measurement and synchronization
Solution Approach 1:
The network side device provides feedback to the user equipment by notifying the working state duration of the cell. This feedback mechanism enables the user equipment to understand when the cell will be enabled or disabled, allowing it to perform measurement and synchronization only during periods when the cell is actually transmitting signals. This resolves the contradiction by eliminating harmful interference through disabling while maintaining measurement accuracy through informed timing.
3Adaptability or versatility
If the user equipment performs measurement in each downlink subframe assuming the cell always sends CRS, then measurement coverage is maintained, but measurement results become erroneous when the cell is disabled
Solution Approach 1:
The solution introduces dynamic adaptability by making the user equipment's measurement behavior dependent on the notified working state duration of the cell. Instead of statically measuring in every downlink subframe, the user equipment dynamically adjusts its measurement timing based on the cell's actual transmission schedule. This dynamic approach maintains measurement coverage while ensuring reliability, as measurements are performed only when the cell is guaranteed to be transmitting signals.
Data Source
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AI summary
The present invention relates to the field of mobile communications technologies, and in particular, to a method and an apparatus for supporting user equipment in task execution, which are used to resolve a problem that a result of measurement and/or synchronization performed by user equipment is erroneous. The method for supporting user equipment in task execution provided in the present invention includes: acquiring, by a first network-side device, duration of a cell working state, where the duration of the cell working state includes duration for which a cell performs signal sending and/or duration for which the cell does not perform signal sending; and determining, by the first network-side device, a time for user equipment to perform measurement and/or synchronization, where the time for the user equipment to perform measurement is within a range of duration for which a to-be-measured cell performs signal sending, and the time for the user equipment to perform synchronization is within a range of duration for which a serving cell performs signal sending. The present invention not only can ensure accuracy of a result of measurement and/or synchronization performed by UE, but also can implement disabling of a cell when the cell has no service.