Multi-Stage Wakeup Signaling for Passive Device Energy Readiness
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in managing power consumption and latency for passive devices that operate on intermittent energy sources, leading to unnecessary power expenditure and communication failures due to insufficient energy levels.
Innovation Solution
Implementing multi-stage wakeup signaling with energy handshake messages, including first and second-stage wakeup indicators and notifications, configured with repetition factors and periodicity, to manage energy levels and communication readiness in passive devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive devices continuously monitor for communications, then communication availability is improved, but power consumption increases
Solution Approach 1:
The network sends a first-stage wakeup indicator before the actual communication data arrives, allowing the passive device to prepare in advance. The device can then wake up from low-power state at the appropriate time to receive communications, ensuring availability while minimizing power consumption by not continuously monitoring.
Solution Approach 2:
The wakeup signaling is divided into multiple stages: a first-stage wakeup indicator that provides early notification, and a second-stage wakeup notification that confirms actual communication timing. This segmentation allows the passive device to manage its power state more effectively by knowing when to wake up partially vs. fully.
2Loss of time
If passive devices wake up frequently to check for communications, then response time is improved, but energy depletion occurs
Solution Approach 1:
The first-stage wakeup indicator is sent in advance before the on-duration, giving the passive device head notice to wake up only when necessary. This eliminates the need for frequent wake-ups while maintaining responsive communication, as the device wakes up precisely when there is actual data to transmit or receive.
Solution Approach 2:
The passive device sends a wakeup notification in response to receiving the wakeup indicator, creating a feedback mechanism. The network then sends a second-stage wakeup notification based on this feedback, ensuring the device wakes up only when both sides are ready to communicate, optimizing both response time and energy usage.
3Use of energy by moving object
If multi-stage wakeup signaling is implemented, then power efficiency is improved, but system complexity increases
Solution Approach 1:
The complex wakeup process is segmented into distinct stages with clear functions: first-stage indicator for early notification, wakeup notification from the device, and second-stage indicator for confirmation. This segmentation makes the overall complex system more manageable by breaking it into simpler, well-defined components.
Solution Approach 2:
The wakeup notification from the passive device acts as an intermediary that bridges the network and the device's power management system. This intermediary mechanism simplifies the interaction by providing a clear signal that the device is ready, reducing the complexity of power state management while maintaining efficiency.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. The network may implement multi-stage energy handshake messages (e.g., wakeup indicators (WUIs and multi-stage wakeup notifications (WUNs))). The first-stage WUI and first-stage WUN may include minimal information (e.g., a sequence-based signal). Second stage WUIs may include an amount of data buffering for the UE, or an expected amount of time of communications during a next on duration. Second-stage WUNs may include confirmation that the UE 115 will receive the buffered data, or an indication of an amount of time required (e.g., a number of duty cycles or a number of seconds) to have enough energy to communicate. In some examples, the UE 115 may transmit WUNs prior to receiving WUIs. In some examples, the UE 115 may receive a multicast message prior to receiving a WUI.