DRX Reference Signal Scheduling for Fast UE Resynchronization
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Solution Overview
Problem
The process of monitoring for reference signals in disconnected mode is inefficient, requiring significant time and power consumption for wireless communication devices to re-synchronize with the network.
Innovation Solution
Implementing sporadically-on transmissions of reference signals configured by the network, allowing devices to monitor for these signals prior to the ON period of the DRX cycle, reducing the time and power required for synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors for reference signals continuously to maintain synchronization in disconnected mode, then synchronization reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) cycles where the UE alternates between active monitoring periods and sleep periods. During ON durations, the UE monitors for reference signals to maintain synchronization, while during OFF durations, monitoring is suspended to save power. This periodic action resolves the contradiction by providing synchronization only when necessary rather than continuously.
Solution Approach 2:
The UE performs synchronization operations in advance before the ON period begins. The wireless interface is transitioned to active state提前, allowing the UE to acquire timing reference and synchronize with the network before data reception starts, reducing the need for prolonged monitoring during the ON period.
2Reliability
If the UE transitions the wireless interface to active state earlier to receive data during ON period, then data reception reliability is improved, but power consumption increases
Solution Approach 1:
The UE transitions the wireless interface from inactive to active state before the ON period begins, allowing time for re-synchronization and preparation to receive data. This preliminary action ensures the interface is ready for immediate data reception when the ON period starts, improving reliability without requiring the interface to remain active throughout the entire OFF period.
Solution Approach 2:
The wireless interface dynamically transitions between inactive and active states based on the DRX cycle timing. The interface is activated only when needed (before ON periods) and deactivated during OFF periods, optimizing the balance between readiness for data reception and power conservation through dynamic state changes.
3Speed
If the UE monitors for reference signals prior to ON period to maintain synchronization, then synchronization speed is improved, but power consumption increases
Solution Approach 1:
The UE performs reference signal monitoring and synchronization operations before the ON period begins, during the transition from inactive to active state. This preliminary synchronization ensures that when the ON period starts, the UE is already synchronized and ready for immediate data reception, improving synchronization speed while limiting power consumption to only the brief transition period rather than the entire ON duration.
Data Source
AI summary
A method of operating a wireless communication device (101) includes, when operating in a connected mode (301), prior to a transition (309) to a disconnected mode (302, 303): receiving, from a communications network (100), at least one downlink message (4021, 4011) comprising configuration information indicative of at least one configuration of a sporadically-on transmission (900) of a reference signal (901, 4001). The method also includes, when operating in the disconnected mode (302, 303) in accordance with a discontinuous reception cycle (390): monitoring for the reference signal (901, 4001) sporadically transmitted by the communications network (100) in accordance with the at least one configuration. The reference signal (901, 4001) is suitable for maintaining synchronization in a further communication with the communications network (100) during an on-period (396) of the discontinuous reception cycle.