PDCCH SCell Dormancy Signaling for Lower Delay and Power Use
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Solution Overview
Problem
Existing wireless communication systems face challenges in reducing application delay times after secondary cell (SCell) dormancy indications, leading to inefficient power consumption and performance in user equipment (UEs).
Innovation Solution
Implementing a physical downlink control channel (PDCCH) with SCell dormancy indications to manage UE behavior, allowing for scheduled data transmission and selecting between dormancy and non-dormancy modes based on system configuration, along with using PDCCH wake-up signals (PDCCH WUS) to indicate dormancy behavior outside active DRX cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the PDCCH provides only the SCell dormancy indication (first case), then power consumption is reduced through dormancy behavior, but application delay time increases
Solution Approach 1:
The patent applies preliminary action by providing the dormancy indication in advance through the PDCCH before the UE needs to switch to dormancy behavior. This allows the UE to prepare for the state transition earlier, reducing the actual application delay time while still achieving power savings through timely dormancy activation.
Solution Approach 2:
The patent implements dynamics by making the PDCCH configuration flexible and adaptable. The system can dynamically adjust between providing only dormancy indications or providing both indications and data based on current system conditions, allowing optimization of the balance between power consumption and delay time depending on the operational context.
2Loss of time
If the PDCCH provides the SCell dormancy indication and schedules data (second case), then application delay time is reduced, but power consumption increases
Solution Approach 1:
The system dynamically selects between the first case (dormancy indication only) and the second case (dormancy indication plus data scheduling) based on current operational requirements. When low delay is critical, the system uses the second case; when power saving is prioritized, it uses the first case, allowing flexible optimization of the trade-off.
Solution Approach 2:
The patent changes the parameter of PDCCH content configuration based on system needs. By adjusting what information is included in the PDCCH (only dormancy indication or both dormancy indication and data), the system can control the balance between power consumption and application delay time to match current operational priorities.
3Use of energy by moving object
If SCell dormancy indication is used to manage UE behavior, then power efficiency is optimized, but device complexity increases
Solution Approach 1:
The PDCCH is designed to serve multiple functions: it can provide dormancy indications, schedule data, or do both depending on configuration. This multi-functionality reduces the need for separate dedicated signaling mechanisms, thereby limiting the increase in device complexity while still achieving power efficiency through dormancy management.
Solution Approach 2:
The UE uses the existing PDCCH structure to obtain dormancy indications without requiring additional dedicated signaling resources. By leveraging the already-present PDCCH mechanism for dual purposes (data scheduling and dormancy indication), the system achieves power efficiency while minimizing additional complexity in the UE device.
Data Source
AI summary
Aspects of the disclosure relate to wireless communications utilizing dormancy indications for secondary cells (SCells) and determining application delay times based on the dormancy indications.