Mobile Device Sleep Interval Negotiation for Power Conservation
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Solution Overview
Problem
There is a need to improve the standby capability of mobile communications devices by effectively managing wake and sleep intervals without adversely impacting user satisfaction, especially when transitioning between circuit-switched and packet-switched networks or wireless local area networks.
Innovation Solution
A method where a mobile device negotiates a first sleep interval with an access point and then adjusts it to a longer second sleep interval based on negotiations with other entities, allowing for extended sleep periods while buffering data to reduce power consumption and prevent data loss during handoffs between networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile device uses a shorter sleep interval to check for data frequently, then data delivery reliability is improved, but power consumption increases
Solution Approach 1:
The access point buffers data in advance during periods when the mobile device is in sleep mode, so that when the device wakes up, the data is already ready for immediate delivery. This preliminary buffering action eliminates the need for frequent wake-ups to check for data, resolving the contradiction between reliability and power consumption.
Solution Approach 2:
The access point acts as an intermediary between the network and the mobile device. It receives data from the network and stores it temporarily, then delivers it to the mobile device when the device is awake. This intermediary buffering mechanism allows the device to sleep longer without compromising data delivery reliability.
2Use of energy by moving object
If the mobile device extends the sleep interval to save power, then power consumption is reduced, but data loss risk increases during network handoffs
Solution Approach 1:
The access point performs preliminary data buffering during the extended sleep interval, preparing data for delivery before the mobile device needs to wake up. This ensures that even with longer sleep intervals, data is not lost during network handoffs or transition periods.
Solution Approach 2:
The system uses feedback mechanisms where the mobile device notifies the access point of its wake-up times, and the access point adjusts buffering strategies accordingly. This feedback loop ensures data is buffered appropriately during extended sleep intervals while maintaining delivery reliability.
3Ease of operation
If the mobile device frequently wakes up to check for data, then user responsiveness is improved, but battery life decreases
Solution Approach 1:
Data is buffered in advance by the access point during mobile device sleep periods, so when the device wakes up, data is immediately available for delivery. This eliminates the need for frequent wake-ups to check for data, thereby extending battery life while maintaining user responsiveness.
Solution Approach 2:
Instead of continuous or frequent checking, the system uses periodic wake-ups at optimized intervals. The mobile device wakes up periodically to check for data, but the access point's buffering capability allows for longer intervals between wake-ups, extending battery life while maintaining acceptable user responsiveness.
Data Source
AI summary
The disclosure is directed to a mobile communication device that is capable of accessing different types of networks such as a circuit-switched network and a packet-switched network. While communicating over the packet-switched network, the device negotiates a sleep interval that is longer than the ordinary interval available using the packet-switched network. In this manner, the device wakes less frequently and thereby conserves power. A buffering system is included so that data directed towards the device while it is asleep may be buffered for later delivery when the device awakens.