DRX Cycle Extension for MTC Paging Power Optimization
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Solution Overview
Problem
Current DRX cycle design for mobile terminals is not efficient for machine type communication (MTC) user equipment, leading to high power consumption due to frequent monitoring of paging messages, as existing mechanisms do not account for the sparse and small data packets characteristic of MTC traffic.
Innovation Solution
The proposed solution extends the DRX cycle by adjusting the system frame number (SFN) cycle and UE-specific paging cycle, allowing for longer paging cycles and increased SFN wrap-around length, synchronized between the mobile terminal and network, to reduce power consumption and distribute paging loads more evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors PDCCH frequently to receive paging messages, then the paging message reception reliability is improved, but the power consumption increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) where the UE periodically monitors PDCCH for paging messages instead of continuous monitoring. The UE wakes up at specific paging occasions (PO) determined by DRX parameters and sleeps at other times, achieving periodic action that reduces power consumption while maintaining paging message reception capability.
Solution Approach 2:
The patent introduces dynamic DRX parameter configuration where the network can adjust DRX cycle lengths, paging occasions, and other parameters based on UE traffic patterns and network conditions. This allows the monitoring frequency to be dynamically optimized between power saving and reliability requirements.
2Device complexity
If the default paging cycle is used, then the system complexity is reduced, but the power consumption for MTC devices increases
Solution Approach 1:
The patent applies different paging cycle configurations to different device types. MTC devices can be configured with extended DRX cycles and customized paging occasions suitable for their sparse traffic patterns, while other devices use standard configurations. This local quality differentiation allows power optimization for MTC without affecting other devices.
Solution Approach 2:
The patent changes key paging parameters including DRX cycle length, paging occasion timing, and SFN offsets to create extended paging cycles for MTC devices. These parameter changes enable MTC devices to monitor paging less frequently, reducing power consumption while maintaining connectivity for their specific traffic characteristics.
3Use of energy by moving object
If the UE-specific paging cycle is configured, then the power consumption is reduced, but the device complexity increases
Solution Approach 1:
The patent performs preliminary configuration of UE-specific DRX parameters during initial attachment or tracking area update procedures. The network pre-configures appropriate DRX cycles and paging occasions based on anticipated MTC traffic patterns, so the device can immediately benefit from power savings without complex real-time calculations or adjustments.
Data Source
AI summary
A method and device for monitoring paging signals are provided. A method of DRX cycle extension for a mobile terminal in an IDLE mode is provided. The method is used to extend the current DRX cycle. A longer paging cycle is designed by extending a UE-specific paging cycle or introducing a new coefficient in system information. A method for extending the SFN is proposed in the invention. A boundary and a serial number of the SFN in the longer wrap around are indicated by the SI. To avoid a situation in which the high paging load occurs in certain paging frames or subframes, the UE_ID is extended in the invention. The proposed mechanism can flexibly adjust the paging cycle and the SFN extension to meet the actual requirements. The long DRX cycle can save a lot of power consumption of the mobile terminals in the IDLE mode.