IEEE 802.16e Mobile Station Sleep Mode Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The IEEE 802.16e system's standard power-saving mechanism fails to effectively manage power consumption when multiple service connections switch to a sleep mode, leading to premature battery drain due to frequent transitions between sleep and listening states.
Innovation Solution
A scheduled power-saving method that synchronizes service connections by determining synchronization conditions, matching sleep intervals, and adjusting sleep requests to extend the unavailable state of a mobile station, ensuring that low QoS insensitive connections align with high QoS sensitive connections already in sleep mode, thereby optimizing power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the standard power-saving mechanism is used when multiple service connections switch to sleep mode, then each connection independently manages its sleep/listening states, but the mobile station frequently transitions to available state consuming power
Solution Approach 1:
The patent merges the sleep mode management of multiple service connections by synchronizing their sleep intervals. When multiple connections are in sleep mode, the mobile station aligns their sleep intervals and extends the unavailable state, allowing the station to remain in low-power mode longer without missing critical service requests. This combining approach prevents frequent transitions to available state while maintaining service reliability.
2Use of energy by moving object
If service connections are synchronized to extend unavailable state, then power consumption is reduced, but service connection timing coordination complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-synchronizing sleep intervals before entering sleep mode. The mobile station determines appropriate sleep intervals in advance, aligns them with ongoing connections, and prepares synchronization parameters before transitioning to sleep mode. This preliminary coordination reduces the complexity of real-time synchronization management while achieving extended unavailable states for power savings.
3Use of energy by moving object
If sleep intervals are matched and extended, then the unavailable state is prolonged saving power, but the ability to respond to urgent service requests may be delayed
Solution Approach 1:
The patent implements dynamic sleep interval adjustment based on service connection characteristics. The mobile station monitors service requirements and dynamically adapts sleep interval lengths, extending them when service demands are low and reducing them when urgent requests are detected. This dynamic approach allows prolonged unavailable states for power savings while maintaining the ability to respond timely to urgent service requests.
Data Source
AI summary
A method for improving power saving performance of a mobile station in an IEEE 802.16e system is provided. The method includes a first process for determining whether a synchronization condition is satisfied, the synchronization condition being that a service connection newly requested to switch to a sleep mode is low QoS insensitive to delay and there are one or fewer service connection that is in a sleep mode and whose connection type is high QoS sensitive to delay among other service connections; a second process of transmitting to a base station a sleep request message for equalizing a start time of a sleep mode of the service connection to a start time of a next sleep interval of a service connection already in the sleep mode, matching a minimum sleep interval of the service connection to the next sleep interval of the service connection already in the sleep mode, and matching a maximum sleep interval of the service connection to a maximum sleep interval of the service connection already in the sleep mode, for sleep-mode synchronization among a plurality of service connections in a mobile station when the synchronization condition is satisfied; and a third process for switching the service connection to a sleep mode indicated by the sleep request message upon receipt of a sleep response message from a base station in response to the sleep request message.