Enhanced DRX Paging Intervals for Shared Spectrum Power Efficiency
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Solution Overview
Problem
Current wireless communication systems operating in shared frequency bands face challenges with inefficient paging mechanisms, leading to increased power consumption and imperfect transmission scheduling due to reliance on longer idle times and imperfect information about data availability for devices.
Innovation Solution
The implementation of an enhanced discontinuous reception (DRX) design that includes multiple or extended paging intervals and the use of paging queue status indications, such as pending and empty indications, to optimize reception windows and reduce power consumption by allowing devices to adjust their reception based on pending data, thereby improving transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If devices use longer idle times in traditional DRX, then power consumption is reduced, but transmission scheduling efficiency deteriorates due to imperfect information about data availability
Solution Approach 1:
The base station provides feedback to the UE through paging queue status indications (empty indication, pending indication) that inform the UE about the presence or absence of pending data. This feedback mechanism allows the UE to make informed decisions about extending its awake period, resolving the contradiction between power savings and scheduling efficiency by eliminating the need for conservative long idle times.
Solution Approach 2:
The base station performs preliminary actions by determining whether data is pending for the UE before the UE enters idle mode, and communicates this information through paging queue status indications. This preliminary action allows the UE to adjust its DRX behavior in advance, avoiding unnecessary wake-ups while ensuring timely data reception, thus improving both power efficiency and scheduling performance.
2Measurement precision
If devices monitor for pages continuously, then transmission scheduling accuracy is improved, but power consumption increases
Solution Approach 1:
The UE dynamically adjusts its monitoring behavior based on received paging queue status indications. When an empty indication is received, the UE can extend its awake period to monitor for additional pages with high accuracy. When a pending indication is received, the UE extends monitoring to ensure it doesn't miss important data. This dynamic adjustment resolves the contradiction by adapting monitoring precision to actual network conditions rather than using fixed continuous monitoring.
Solution Approach 2:
The system changes the parameter of monitoring duration based on the paging queue status indication received from the base station. The UE transitions between different monitoring states (extended awake period vs. normal DRX cycle) depending on whether empty or pending indications are received, optimizing the balance between scheduling accuracy and power consumption for each specific scenario.
3Reliability
If devices extend awake periods to monitor for pages, then paging reliability is improved, but power consumption increases
Solution Approach 1:
The base station provides feedback through paging queue status indications that enable the UE to extend its awake period only when necessary. The empty indication signals that no data is pending, allowing the UE to extend monitoring for potential new pages while the pending indication triggers extension to ensure reliable reception of existing pending data. This feedback-driven approach improves paging reliability without causing unnecessary power consumption during periods when no data is available.
Data Source
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Figure 3A~3C
AI summary
Methods, systems, and devices for wireless communication are described. A base station may transmit a configuration for enhanced paging to a UE being served by a cell over a shared frequency band. The enhanced paging may include multiple paging intervals for each paging cycle. The UE may enable reception for a paging interval and determine whether the UE receives a downlink transmission. The UE may lengthen a paging interval or enable reception during a second paging interval based in part on determining whether the UE receives a downlink transmission. In some examples, the UE may receive a paging queue status indication indicating that paging information will be transmitted during a paging interval or a later interval, or indicating that no paging information is present at a serving cell.