5G NR Cell Re-selection Measurement Window Configuration
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Solution Overview
Problem
In 5G wireless communication systems, the high-frequency spectrum used for New Radio (NR) experiences poor Signal to Noise Ratio (SNR)/Signal to Interference and Noise Ratio (SINR) due to atmospheric penetration and diffraction attenuation, leading to inefficient cell re-selection measurements in RRC_IDLE and RRC_INACTIVE states, resulting in excessive energy consumption by User Equipment (UE) while monitoring downlinks for cell re-selection signals.
Innovation Solution
A method is introduced where a radio network node configures User Equipment (UE) with repetitive measurement windows that align with the transmission periods of Synchronization Signal (SS) Blocks, excluding periods with no signal transmissions, using configuration parameters such as window periodicity, offset, and duration, to optimize cell re-selection measurements and reduce unnecessary monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE continuously monitors downlink for cell re-selection signals in high-frequency spectrum, then cell re-selection reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic measurement windows where the UE monitors downlink signals only during specific time intervals rather than continuously. The measurement window is configured with a periodicity that aligns with the SS block transmission pattern, allowing the UE to enter low-power states between measurement windows while still capturing necessary cell re-selection information periodically.
2Measurement precision
If UE monitors downlink continuously for cell re-selection, then measurement precision is improved, but time efficiency deteriorates
Solution Approach 1:
The patent establishes periodic measurement windows that are synchronized with the SS block transmission periodicity. This allows the UE to concentrate monitoring efforts during specific time windows rather than spreading monitoring continuously, thereby maintaining measurement accuracy while reducing total monitoring time and enabling more efficient use of time resources.
3Reliability
If measurement window duration is increased to capture more SS blocks, then measurement reliability is improved, but energy consumption increases
Solution Approach 1:
The patent introduces dynamic measurement window configuration where the network can adjust the measurement window duration and periodicity based on deployment scenarios, SS block periodicity, and coverage conditions. This dynamic adjustment allows the system to optimize the balance between measurement reliability and energy consumption by extending measurement windows when needed and reducing them when conditions permit.
Data Source
AI summary
A radio network node, such as a gNodeB (gNB), a User Equipment (UE) and a method, for configuring the UE for camping on a cell in a radio network for Synchronization Signal (SS) Blocks based cell re-selection measurements for RRC_IDLE and RRC_INACTIVE states. The method includes providing information to the UE, including configuration parameters for a measurement window, the configuration parameters defining a window periodicity, offset and duration, for configuring the UE for the SS Blocks based cell re-selection measurements for RRC_IDLE and RRC_INACTIVE states. Radio Resource Control (RRC) signaling is used to convey the information to the UE prior to or in conjunction with switching the UE from RRC_CONNECTED state to RRC_INACTIVE or RRC_IDLE state, a RRCConnectionRelease message is used to convey the information to the UE and the information is also provided to the UE in system information (SI).