Mobile Device DRX Autonomous Gap Scheduling for Cell Measurement
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently collecting system information and cell measurements from target cells without disrupting communication with the serving cell, particularly in femto base station environments, where the use of discontinuous reception (DRX) and autonomous gaps is not well-established.
Innovation Solution
A mobile communication device method and system that schedules an autonomous gap based on timing information to receive system information from target cells, using DRX gaps initially and switching to autonomous gaps when necessary to complete the measurement process within specified time limits, thereby minimizing communication disruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If DRX gaps are used to collect system information and cell measurements, then energy consumption is reduced and communication with serving cell is maintained, but the time available for measurement is limited and may not complete within required duration
Solution Approach 1:
The patent dynamically switches between DRX gaps and autonomous gaps based on measurement requirements. When DRX gaps are insufficient to complete measurements within the required time, the system transitions to using autonomous gaps, which provide longer measurement opportunities without the strict energy-saving constraints of DRX operation.
Solution Approach 2:
The measurement process is segmented into multiple phases: initial measurements during DRX gaps, followed by additional measurements during autonomous gaps if needed. This segmentation allows the system to first attempt energy-efficient measurement collection, then supplement with longer gaps only when necessary to meet timing requirements.
2Loss of time
If autonomous gaps are used to collect system information and cell measurements, then measurement time is increased and complete information can be obtained, but communication disruption with serving cell increases
Solution Approach 1:
The patent applies partial autonomous gaps rather than continuous gaps. The autonomous gap duration is carefully calculated to be just sufficient to obtain the remaining system information and complete measurements, minimizing communication disruption while ensuring measurement completeness.
Solution Approach 2:
The system performs preliminary measurements during DRX gaps before initiating autonomous gaps. This preliminary action reduces the amount of information that needs to be collected during autonomous gaps, thereby shortening the gap duration and reducing communication disruption.
3Use of energy by moving object
If measurement collection is delayed to use DRX gaps, then energy efficiency is improved, but the measurement may not be completed within the required time limit
Solution Approach 1:
The system continuously monitors measurement progress and provides feedback to the gap selection mechanism. When measurements initiated during DRX gaps are projected to complete within the required time, the system maintains DRX operation. When progress indicates potential timeout, the system switches to autonomous gaps to ensure reliable completion.
Solution Approach 2:
The measurement strategy dynamically adapts based on real-time measurement progress. The system transitions from a passive DRX-based approach to an active autonomous gap approach when measurement completion reliability becomes compromised, ensuring both energy efficiency and reliable completion.
Data Source
AI summary
A mobile communication device and a method thereof are provided. The method, adopted by a mobile communication device connected to a serving cell, including: receiving a measurement request for a first target cell; in response to the measurement request, acquiring first timing information of first system information for a first target cell; scheduling an autonomous gap substantially corresponding to occurrence of the first system information according to the first timing information; and initiating the autonomous gap to receive the first system information from the first target cell.