WLAN Interframe Space Time Selection Protocol
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Solution Overview
Problem
Wireless network devices face challenges in minimizing power consumption and avoiding collisions in infrastructure and ad-hoc modes, particularly when multiple networks overlap, leading to inefficiencies in data transmission and increased power usage.
Innovation Solution
Implementing a wireless network device with a control module that determines a default interframe space (IFS) time based on beacon data, allowing for the selection of a shorter IFS time when specific conditions are met, and a power management module that transitions between active and inactive modes to conserve power and reduce collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If client stations use standard IFS time for data transmission, then collision avoidance is maintained, but power consumption increases due to longer awake time
Solution Approach 1:
The patent applies dynamics by making the IFS time adjustable rather than fixed. The system dynamically selects between a first IFS time (shorter) and a second IFS time (longer) based on network conditions and transmission requirements, allowing optimization between power consumption and collision avoidance in real-time
Solution Approach 2:
The patent changes the parameter of IFS time by introducing multiple possible values (first IFS time and second IFS time) that can be selected based on different conditions. This parameter variation enables the system to reduce awake time and power consumption while maintaining acceptable collision avoidance through conditional selection
2Use of energy by moving object
If client stations remain in active mode continuously, then data transmission reliability is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic action through the beacon-based synchronization mechanism. Client stations wake up periodically at beacon times to check for data and transmit, then enter low power mode until the next beacon. This periodic activity pattern reduces average power consumption while maintaining transmission reliability through structured access windows
Solution Approach 2:
The patent applies preliminary action by having client stations wake up and listen for beacons before actually needing to transmit data. The beacon notification allows stations to prepare for data transmission in advance, enabling them to remain in low power mode longer while still ensuring reliable data exchange when needed
3Productivity
If multiple wireless networks operate simultaneously, then network utilization increases, but collisions between networks occur
Solution Approach 1:
The patent uses feedback mechanisms where beacon transmissions provide information about network status and transmission opportunities. This feedback allows client stations to make informed decisions about when to transmit, reducing collisions between multiple networks while maintaining high utilization through coordinated access
Data Source
AI summary
A wireless network device in a wireless network that includes a plurality of wireless network devices comprises n RF transceiver that transmits and receives data packets and that periodically transmits or receives a beacon. A control module communicates with the RF transceiver, determines a group identifier and a station identifier based on the beacon, and selects one of a default IFS time and a second IFS time based on a data packet received.