Mobile Assisted Sleep Mode Channel Monitoring
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Solution Overview
Problem
Current mobile sleep modes in wireless networks, such as Enhanced UMTS and 802.16e, face inefficiencies in battery conservation and data transmission due to poor radio conditions upon waking, leading to increased latency and retransmissions, as well as the inability to communicate channel conditions until awake, resulting in suboptimal battery savings and potential missed communications.
Innovation Solution
A method for aperiodic mobile assisted sleep mode, where the mobile receives a channel condition threshold and monitors channel conditions, waking up only when conditions exceed the threshold, allowing for efficient battery conservation and optimized data exchange by sending an awake indication message with channel quality information, thereby reducing unnecessary wake-ups and retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the mobile enters paging state with discontinuous reception to conserve battery charge, then battery life is extended, but data transmission latency increases and communication reliability deteriorates when radio conditions are poor upon waking
Solution Approach 1:
The mobile station performs preliminary channel condition monitoring during sleep mode before entering paging state. By assessing channel conditions in advance and comparing them against a threshold, the mobile can determine whether to wake up immediately or delay waking until conditions improve, thus avoiding latency caused by poor radio conditions while still conserving battery charge during extended sleep periods.
Solution Approach 2:
The system dynamically adjusts the wake-up timing based on real-time channel condition assessments. Instead of fixed periodic wake-ups, the mobile can delay waking until channel conditions meet a threshold, creating a dynamic adaptation mechanism that optimizes both battery conservation and transmission timing based on current radio environment.
2Reliability
If the mobile wakes up at predetermined intervals in paging state, then the mobile can check for network paging messages, but data transmission may occur in non-optimum radio conditions leading to retransmissions and reduced efficiency
Solution Approach 1:
The mobile station performs preliminary channel quality assessment during sleep mode by monitoring channel conditions and comparing them to a threshold value. This preliminary action allows the mobile to determine the optimal wake-up timing, ensuring that data transmission occurs only when radio conditions are favorable, thereby avoiding retransmissions and improving transmission efficiency while maintaining reliable communication.
Solution Approach 2:
The system implements feedback through threshold-based channel condition monitoring. The mobile continuously assesses channel quality and uses this feedback to make informed decisions about wake-up timing. When channel conditions exceed the threshold, the mobile wakes up for efficient data transmission; otherwise, it remains in sleep mode, creating a feedback-driven optimization loop.
3Productivity
If the mobile continuously monitors channel conditions while in sleep mode, then the mobile can identify optimal wake-up times for data transmission, but energy consumption during sleep mode increases
Solution Approach 1:
The mobile station performs partial channel condition monitoring during sleep mode rather than continuous monitoring. By sampling channel conditions at reduced frequency and only performing full assessments when necessary, the mobile achieves sufficient optimization for determining wake-up timing while minimizing the energy consumption associated with monitoring activities during sleep state.
Data Source
AI summary
Disclosed is a method for mobile assisted sleep mode to reduce current drain in packet based mobile systems. The method comprising the step of receiving (102) from a network a channel condition threshold. Then, monitoring (104) a channel condition while in sleep mode. Then exiting (110) sleep mode in response to the determination (108) that the monitored channel condition is greater than the channel condition threshold.