DRX Cycle Configuration for Heterogeneous Network Paging Reliability
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Solution Overview
Problem
In heterogeneous networks (HetNets), user equipment (UE) faces challenges in reliably detecting paging occasions due to interference from aggressor cells, which can lead to increased battery consumption and failure to meet ETWS/CMAS monitoring requirements when limited to reading paging only during on-duration periods that fit into restricted subframes.
Innovation Solution
Configuring the Discontinuous Reception (DRX) cycle to 5*2^n subframes and setting the DRX start offset to align on-duration periods with paging occasions protected by restricted subframes, allowing UE to read paging during active time and reducing unnecessary wake-ups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If UE is limited to reading paging only during on-duration periods that fit into restricted subframes, then interference from aggressor cells is reduced, but ETWS/CMAS monitoring requirements cannot be met and battery consumption increases
Solution Approach 1:
The patent dynamically configures the DRX cycle length to be a multiple of the restricted subframe pattern period, allowing the on-duration to be flexibly positioned within the restricted subframe pattern. This dynamic configuration enables the system to adapt to different traffic conditions and interference patterns while ensuring that paging occasions are properly aligned with protected subframes, thereby meeting both interference reduction and monitoring reliability requirements
Solution Approach 2:
The patent changes the DRX cycle parameter to be a multiple of the restricted subframe pattern period (e.g., 10, 20, 40, 80, 160, 320 subframes). This parameter change ensures that the on-duration periodically aligns with restricted subframes, allowing the UE to read paging during protected periods while maintaining reliable ETWS/CMAS monitoring without excessive battery consumption
2Reliability
If UE reads paging frequently to meet monitoring requirements, then ETWS/CMAS monitoring reliability is improved, but battery consumption increases
Solution Approach 1:
The patent implements periodic action by configuring the DRX cycle to be a multiple of the restricted subframe pattern period, creating a periodic alignment between on-duration and protected subframes. This periodic structure allows the UE to read paging at optimal intervals that meet monitoring requirements while minimizing wake-ups, thereby reducing battery consumption compared to continuous or frequent paging checks
3Reliability
If DRX cycle is configured to align with restricted subframes, then paging detection reliability is improved, but device complexity increases
Solution Approach 1:
The patent simplifies the configuration by defining the DRX cycle as a multiple of the restricted subframe pattern period using a standardized set of values (10, 20, 40, 80, 160, 320 subframes). This parameter relationship provides a clear, rule-based configuration method that reduces complexity compared to arbitrary DRX cycle settings, while ensuring proper alignment between on-duration and protected subframes for reliable paging detection
Data Source
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AI summary
A method for operating a UE in a wireless communications network is provided. The method comprises attempting, by a UE configured to operate in a DRX mode and with time domain measurement resource restrictions, to read a paging message in a paging occasion in a restricted subframe during DRX active time.