DRX Measurement Reporting for Handover Reliability
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Solution Overview
Problem
In wireless communication systems, particularly in LTE-A, the discontinuous reception (DRX) technology leads to handover failures and wireless link failures due to the use of outdated measurement reports when the DRX cycle is longer than the time to trigger, causing signal quality changes between cells, which affects mobility performance.
Innovation Solution
A method is introduced to determine the validity of the first time to trigger for measurement events in DRX mode, using a second time to trigger if the first is invalid, allowing the user equipment (UE) to perform measurements in subsequent activated states and report only valid measurement reports, thereby avoiding outdated reports and improving handover success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If DRX technology is used to reduce power consumption, then energy efficiency is improved, but measurement reports become outdated causing handover failures
Solution Approach 1:
The patent applies dynamics by making the time to trigger parameter adaptable and adjustable based on UE activity state. When UE transitions between active and idle states, the time to trigger is dynamically adjusted to be shorter during active states (enabling timely handovers) and can be extended during idle states (reducing unnecessary measurements). This dynamic adjustment resolves the contradiction by allowing the system to maintain reliable handovers during active periods while reducing power consumption during idle periods.
Solution Approach 2:
The patent changes the parameter of time to trigger based on UE activity conditions. Specifically, when the UE is in an active state and data transmission is detected, the time to trigger is set to a first value (shorter duration). When the UE is in an idle state, the time to trigger is set to a second value (longer duration). This parameter change strategy allows the system to balance between handover reliability during active communication and power savings during idle periods, resolving the technical contradiction.
2Use of energy by moving object
If DRX cycle is extended to save power, then energy consumption is reduced, but measurement accuracy deteriorates due to signal quality changes
Solution Approach 1:
The patent makes the measurement timing dynamic by adjusting the time to trigger parameter according to UE activity state. During active states, a shorter time to trigger ensures measurements are taken frequently enough to capture signal quality changes accurately. During idle states, the extended time to trigger reduces unnecessary measurements while the system still maintains acceptable measurement accuracy for handover decisions. This dynamic approach resolves the contradiction between energy savings and measurement precision.
Solution Approach 2:
The patent applies preliminary action by performing measurements and evaluations during active states when the UE is already powered on and communicating. The system proactively updates measurement reports during these active periods, so that when the UE enters idle state, the most recent accurate measurements are available. This preliminary measurement action during active states ensures measurement precision is maintained without requiring continuous measurements during idle states, thus saving energy while preserving accuracy.
3Reliability
If UE monitors PDCCH continuously to ensure data reception, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic action through DRX operation, where the UE alternates between active monitoring periods and idle sleep periods. During active periods, the UE monitors PDCCH for data transmissions. During idle periods, the UE enters sleep mode to save power. The time to trigger parameter is adjusted to ensure that when the UE wakes from idle state, measurements are performed timely to maintain handover reliability. This periodic monitoring approach resolves the contradiction by balancing power savings during idle periods with reliable data reception during active periods.
Data Source
AI summary
The present disclosure discloses a method for reporting a measurement report of a measurement event, including: determining that a measurement event is generated in a user equipment (UE) in an activated state of discontinuous reception (DRX) mode; judging whether a first time to trigger corresponding to the measurement event is valid when it is determined that there is a measurement event generated; using, when it is judged that the first time to trigger is valid, the first time to trigger to time the measurement event; using, when it is judged that the first time to trigger is invalid, a second time to trigger to time the measurement event, such that the UE is in next one or next several activated states of DRX mode after the generation of the measurement event. The present disclosure can improve a success rate of mobility handover between cells or wireless link quality.