MTC Device DRX Cycle Optimization for Power and Stability
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Solution Overview
Problem
In mobile communication systems, MTC devices face challenges in minimizing power consumption while stably receiving and transmitting messages, as existing methods can lead to increased power consumption and instability due to short or long paging cycles.
Innovation Solution
Implementing a method that uses Discontinuous Reception (DRX) cycles with multiple monitoring and non-monitoring intervals, where messages are repeated within these cycles, allowing MTC devices to monitor active occasions for paging messages through physical downlink control and shared channels, optimizing power usage and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MTC devices use short paging cycles to frequently monitor for messages, then message reception stability is improved, but power consumption increases
Solution Approach 1:
The patent implements DRX (Discontinuous Reception) cycles that periodically switch between monitoring and non-monitoring states. The network configures specific monitoring occasions within each DRX cycle, allowing the MTC device to wake up only at predetermined times to check for paging messages, then return to sleep mode. This periodic monitoring approach ensures messages are reliably delivered at scheduled intervals while dramatically reducing power consumption compared to continuous monitoring.
2Use of energy by moving object
If MTC devices use long paging cycles to reduce power consumption, then power consumption is minimized, but message reception stability deteriorates
Solution Approach 1:
The patent segments the long paging cycle into multiple shorter DRX cycles, each containing specific monitoring occasions. Instead of using a single long interval between message checks, the system divides the time into multiple manageable DRX cycles with configured monitoring and non-monitoring intervals. This segmentation allows the device to maintain reasonable message reception stability by checking at multiple points throughout the extended period while still achieving lower overall power consumption compared to continuous monitoring.
Solution Approach 2:
The patent introduces dynamic adjustment capabilities where the network can configure different DRX cycle lengths, monitoring interval durations, and numbers of monitoring occasions based on traffic conditions and device state. This dynamic configuration allows the system to adapt the monitoring frequency - using shorter effective cycles when messages are likely and longer cycles when traffic is low - thereby balancing power consumption and message reception stability according to actual needs.
3Reliability
If MTC devices continuously monitor for messages, then message reception is ensured, but power consumption increases and battery life decreases
Solution Approach 1:
The patent replaces continuous monitoring with periodic DRX cycles that have clearly defined monitoring occasions and non-monitoring intervals. The device is configured to wake up only at specific monitoring occasions within each DRX cycle to check for paging messages on the PDCCH, then return to sleep mode during non-monitoring intervals. This periodic approach ensures messages are received at scheduled times while minimizing power consumption by keeping the receiver off during non-monitoring periods.
4Reliability
If MTC devices monitor at every paging occasion, then message reception reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements partial monitoring where the device monitors only at specific configured occasions within each DRX cycle rather than at every possible paging occasion. The network configures a subset of monitoring occasions that are sufficient for reliable message delivery based on traffic patterns and QoS requirements. This partial monitoring approach achieves adequate message reception reliability for MTC applications while consuming significantly less power than monitoring at every occasion.
Data Source
AI summary
A method of receiving a message by a wireless device in a mobile communication system is disclosed. The present invention comprises obtaining information of a first cycle, the first cycle including a monitoring interval and a non-monitoring interval; and monitoring at least one active occasion within the monitoring interval for receiving the message, wherein the message is repeated within the monitoring interval.