Wireless Client Power Management for Control Message Reception
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Solution Overview
Problem
Wireless clients operating in power-save modes often miss control messages due to being in a power-OFF state during transmissions, leading to potential disruptions in network operation and increased power consumption when trying to reduce power-OFF durations.
Innovation Solution
A wireless station computes future time instances for control message transmissions and ensures it is in a power-ON state during these times, aligning its power cycles with beacon frames and control message intervals to receive essential updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a wireless client operates in power-save mode with extended power-OFF durations to reduce power consumption, then energy savings are improved, but the client may miss control messages transmitted by the access point, leading to network operation disruptions
Solution Approach 1:
The access point transmits control messages to the wireless client during predetermined wake intervals when the client is guaranteed to be in the power-ON state. By scheduling message delivery in advance during these known active periods, the system ensures reliable message receipt without requiring the client to remain continuously powered ON, thus maintaining power savings while ensuring control messages are delivered before the client enters power-OFF state
Solution Approach 2:
The system employs acknowledgment mechanisms where the wireless client confirms receipt of control messages during its wake intervals. The access point can detect whether messages were successfully received and adjust future message scheduling accordingly, creating a feedback loop that maintains reliability while optimizing power consumption patterns
2Reliability
If a wireless client reduces power-OFF durations to ensure receipt of control messages, then reliability of message receipt is improved, but power savings are reduced
Solution Approach 1:
The wireless client operates in periodic power-save cycles with defined wake intervals and power-OFF periods. During wake intervals, the client is powered ON to receive control messages and data. By structuring operation as periodic cycles rather than continuous operation, the system achieves reliable message receipt during wake periods while maintaining significant power savings during extended power-OFF durations between cycles
Solution Approach 2:
The access point schedules and transmits control messages during predetermined wake intervals before the client enters power-OFF state. This preliminary scheduling ensures messages are delivered in advance during known active periods, eliminating the need for extended power-OFF durations and maintaining both reliability and power efficiency
3Reliability
If a wireless client remains in power-ON state continuously to receive all control messages, then reliability of message receipt is improved, but power consumption increases
Solution Approach 1:
Instead of continuous power-ON operation, the client employs periodic power cycles with wake intervals synchronized to control message transmission schedules. The client powers ON only during these periodic wake intervals to receive messages, then enters power-OFF state for the remainder of the cycle, achieving reliable message receipt while dramatically reducing average power consumption compared to continuous operation
Solution Approach 2:
The access point preliminarily schedules control message transmission during predetermined wake intervals when the client is known to be active. This advance scheduling eliminates the need for continuous client operation, as messages are delivered in advance during coordinated wake periods, enabling the client to enter power-OFF state immediately after receiving messages
Data Source
AI summary
A wireless station (A) is operated in a power-save mode, in which the station is alternately in power-ON and power-OFF states to reduce power consumption. Wireless station (A) computes at least some future time instances at which another wireless station (B) is expected to start transmitting control messages. Wireless station (A) is ensured to be in the power-ON state in corresponding time intervals encompassing durations of at least some of such future transmissions of control messages by wireless station (B), and is thereby enabled to receive the control messages. In an embodiment, the control messages correspond to group key message updates in which values of a decryption key are transmitted, wireless station (A) being a wireless client, wireless station (B) being an access point, with wireless stations (A) and (B) operating in a wireless network consistent with IEEE 802.11 specifications, and communication between wireless stations (A) and (B) being encrypted.