Communication Device Dormancy via Session End Resend
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Solution Overview
Problem
Existing wireless communication devices face challenges in reducing power consumption after a data session has ended, leading to prolonged battery drain due to the inability to quickly transition to a low-power state, especially when network responses to session end messages are unreliable or delayed.
Innovation Solution
A method and apparatus that allow a communication device to selectively resend a message indicating the end of a data session to a radio network controller, based on whether data was communicated during a predetermined time period, enabling faster transition to a low-power state by monitoring channel activity and providing state information to applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the device waits for network confirmation before transitioning to low-power state, then reliability of session end is improved, but power consumption increases and transition speed decreases
Solution Approach 1:
The device sends a session end message to the network in advance and simultaneously starts a timer, rather than waiting passively for network confirmation. This preliminary action allows the device to proactively initiate the session end process and transition to low-power state after the timer expires, reducing power consumption while maintaining reliability through the timer-based confirmation mechanism.
Solution Approach 2:
The device implements a feedback mechanism by monitoring whether data is transferred during the timer period after sending the session end message. If no data transfer occurs by the time the timer expires, the device confidently transitions to low-power state. This feedback loop ensures reliable session end detection while avoiding unnecessary delays, thus balancing reliability and power consumption.
2Use of energy by moving object
If the device transitions to low-power state quickly after sending session end message, then power consumption is reduced, but reliability decreases if network response is delayed or lost
Solution Approach 1:
The device sends the session end message to the network in advance and simultaneously starts a timer, rather than waiting passively for network confirmation. This preliminary action allows the device to proactively initiate the session end process and transition to low-power state after the timer expires, reducing power consumption while maintaining reliability through the timer-based confirmation mechanism.
Solution Approach 2:
The device compensates for potential network delays or message losses by implementing a timer mechanism that provides a cushion of time. If the network does not respond within the timer period, the device assumes the session end message was received and acted upon, preventing indefinite waiting and ensuring reliable transition to low-power state even when network responses are delayed or lost.
3Speed
If the device monitors channel activity to determine whether to resend session end message, then transition speed to low-power state is improved, but device complexity increases
Solution Approach 1:
The device uses its existing channel activity detection capabilities, which are already part of normal wireless communication operations, to determine whether to resend the session end message. Rather than implementing a separate monitoring system, the device leverages its own operational data (whether data was transferred during the timer period) to make intelligent decisions about message resending, thus achieving faster transition to low-power state without significantly increasing device complexity.
Data Source
AI summary
A method includes receiving a dormancy request from an application executing at a communication device. In response to the dormancy request, a message is sent from the communication device to a radio network controller. The message indicates that a data session has ended. After expiration of a time period following sending of the message, state information is provided to the application. The state information indicates whether the communication device is in a low-power state.