DRX Control During RRC Reestablishment in LTE
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Solution Overview
Problem
The LTE standard does not specify whether to retain or change discontinuous reception settings for user equipment during RRC connection reestablishment or handover procedures, leading to uncertainties in resuming DRX operations.
Innovation Solution
A method and apparatus for controlling discontinuous reception (DRX) by determining the appropriate time to resume DRX after RRC connection reestablishment or handover, involving the transmission of RRC connection reestablishment or reconfiguration messages to update DRX settings, and using a DRX controller to manage the resumption of DRX operations based on received messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DRX operation is interrupted during RRC connection reestablishment or handover, then communication reliability is improved, but power consumption increases due to continuous monitoring
Solution Approach 1:
The patent implements dynamic DRX configuration that adapts during RRC connection reestablishment and handover procedures. The DRX parameters are adjusted based on the current network state and user equipment conditions, allowing the system to transition between continuous monitoring and discontinuous reception modes dynamically, thereby resolving the contradiction between reliability and power consumption
Solution Approach 2:
The patent changes DRX parameters (such as drx-OnDurationTimer, drx-InactivityTimer, drx-SlotOffset) during RRC connection reestablishment and handover procedures. By modifying these parameters according to network conditions and procedure requirements, the system maintains communication reliability while optimizing power consumption through appropriate DRX operation
2Use of energy by moving object
If DRX settings are retained during RRC connection reestablishment, then power consumption is reduced, but communication efficiency deteriorates due to potential configuration mismatches
Solution Approach 1:
The patent implements feedback mechanisms where the network provides DRX configuration information to the user equipment during RRC connection reestablishment and handover. The network monitors the DRX operation status and adjusts configurations based on feedback from the user equipment, ensuring that DRX settings remain optimal for both power saving and communication efficiency
Solution Approach 2:
The patent performs preliminary DRX configuration updates before critical communication events. By proactively adjusting DRX parameters during RRC connection reestablishment and handover procedures, the system prevents configuration mismatches that would otherwise occur, maintaining both power efficiency and communication performance without requiring reactive corrections
3Use of energy by moving object
If DRX operation continues without updates during handover, then power consumption is minimized, but device complexity increases due to synchronization issues
Solution Approach 1:
The patent uses the RRC layer as an intermediary to manage DRX operations during handover. The RRC connection reconfiguration messages serve as the intermediary mechanism that carries DRX configuration updates from the network to the user equipment, simplifying the synchronization process and reducing device complexity while maintaining power efficiency
Data Source
AI summary
A method and apparatus is configured to control a discontinuous reception (DRX) in a mobile communication system. The method includes: interrupting the DRX operation when a radio resource control (RRC) connection reestablishment procedure is initiated; transmitting an RRC connection reestablishment request message from the user equipment to an evolved node B (ENB); receiving an RRC connection reestablishment message from the ENB to the user equipment; and resuming, if the received RRC connection reestablishment message contains new DRX setting information, the interrupted DRX operation according to the new DRX setting information. The DRX operation can be interrupted or resumed at a proper time point when an RRC connection is reestablished or reconfigured or a handover is performed, thereby reducing power consumption in the user equipment.