DRX Wakeup Signaling With Cell Indication for Lower Overhead
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Solution Overview
Problem
Existing wireless communication systems lack efficient mechanisms for UE to utilize wakeup signals (WUS) during discontinuous reception (DRX) cycles, limiting the conveyance of additional information and increasing signaling overhead.
Innovation Solution
Implementing various mechanisms such as WUS indicating physical cell identifiers (PCIs), default configurations, ACK/NACK resources, and downlink control information (DCI) to enhance wakeup signaling, reducing overhead and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If WUS is used to indicate additional information such as PCIs, then information communication is enhanced, but signaling overhead increases
Solution Approach 1:
The patent combines multiple functions into the WUS message: it simultaneously indicates whether the UE should wake up and conveys PCI information for cell identification. This merging allows additional information to be transmitted without requiring separate signaling messages, thereby enhancing information communication while managing signaling overhead efficiently.
Solution Approach 2:
The WUS is designed to serve multiple purposes: it acts as a wake-up indicator and simultaneously provides cell identification information through PCI indication. This multi-functionality allows the same signaling mechanism to convey different types of information, reducing the need for additional dedicated signaling channels.
2Adaptability or versatility
If multiple candidate cells are configured for UE, then mobility management is improved, but device complexity increases
Solution Approach 1:
The patent segments the cell configuration into a manageable structure where the UE is configured with multiple candidate cells, each identified by a unique PCI. The WUS message then indicates a specific subset of these candidate cells, allowing the UE to focus only on relevant cells during wake-up periods. This segmentation makes mobility management more efficient by organizing cells into configurable groups.
Solution Approach 2:
The patent implements dynamic cell selection where the set of active candidate cells can be changed through subsequent WUS messages. The network can dynamically update which PCIs are active without reconfiguring the entire cell list, allowing flexible adaptation to changing mobility conditions while maintaining a manageable configuration structure.
3Reliability
If WUS indicates PCIs with offset timing, then cell availability is improved, but processing complexity increases
Solution Approach 1:
The patent implements preliminary indication of PCIs in the WUS message, with the understanding that these cells will be available at a future offset time. This allows the network to prepare and indicate cell information in advance, ensuring cell availability when the UE wakes up, while the UE can process this information during its active period rather than requiring immediate processing.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, prior to a first on duration of a discontinuous reception cycle, a first indication that the UE is to remain in an inactive state of the discontinuous reception cycle during the first on duration. The UE may receive, prior to a second on duration of the discontinuous reception cycle, a second indication that the UE is to transition to an active state during the second on duration, wherein the second indication indicates, based at least in part on the first indication indicating that the UE is to remain in the inactive state during the first on duration, and one or more physical cell identifiers for the UE to communicate with while in the active state. The UE may identify the one or more physical cell identifiers indicated in the second indication.