DRX Synchronization for Multi-Numerology Mobile Systems
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Solution Overview
Problem
Mobile communication systems with multiple subcarrier spacings face challenges in synchronizing Discontinuous Reception (DRX) operations due to differences in numerologies between User Equipment (UE) and Base Stations, leading to inefficiencies in data transfer and scheduling.
Innovation Solution
A method and apparatus for facilitating data transfer in OFDM-based mobile communication systems with multiple subcarrier spacings, where the terminal performs DRX based on parameters configured by the base station, including determining specific subframes and points in time for monitoring the Physical Downlink Control Channel (PDCCH) using configured timers and offsets, ensuring synchronized DRX operations across different numerologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple subcarrier spacings are used to support various QoS requirements, then system adaptability is improved, but synchronization between UE and Base Station becomes more difficult
Solution Approach 1:
The patent applies local quality by configuring different DRX parameters (drx-StartOffset, drx-CycleLength, onDurationTimer) specifically for each subcarrier spacing value. This allows each numerology to have optimized DRX settings tailored to its characteristics, resolving the synchronization issue while maintaining multiple subcarrier spacings for different QoS requirements
Solution Approach 2:
The Base Station performs preliminary action by pre-configuring DRX parameters for multiple subcarrier spacings before actual data transmission. The UE receives and stores these configurations in advance, enabling synchronized DRX operation when switching between different numerologies without real-time negotiation delays
2Reliability
If DRX parameters are configured for each subcarrier spacing, then DRX synchronization is improved, but signaling overhead increases
Solution Approach 1:
The patent creates a universal DRX configuration structure where a single RRC message can contain DRX parameters applicable to multiple subcarrier spacings. The Base Station configures a master DRX configuration that can be selectively applied to different numerologies, reducing redundant signaling while maintaining synchronization across multiple subcarrier spacings
3Adaptability or versatility
If onDurationTimer is started at different points in time for different subcarrier spacings, then scheduling flexibility is improved, but false alarms in SPS operations increase
Solution Approach 1:
The Base Station performs preliminary action by pre-calculating and configuring the correct onDurationTimer start points for each subcarrier spacing in the DRX configuration. This ensures that when the UE activates SPS, the timing is already optimized for each numerology, preventing false alarms while maintaining scheduling flexibility
Solution Approach 2:
The system implements feedback mechanisms where the Base Station monitors SPS operation accuracy and can adjust DRX parameters for different subcarrier spacings based on observed false alarm rates, optimizing the balance between scheduling flexibility and reliability
Data Source
AI summary
Data transfer method and apparatus for use in a mobile communication system are provided. Method to perform discontinuous reception includes receiving DRX configuration information from the base station, determining a specific subframe based on parameters included in the configuration information, determining a specific point of time within the subframe based on a parameter included in the configuration information, starting onDurationTimer at the determined point of time of the determined subframe and monitoring PDCCH when the onDurationTimer is running.