Slot Logic for Wireless Beacon Collision Reduction
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently coordinating device communications during beacon intervals, particularly in minimizing collisions and optimizing power consumption.
Innovation Solution
The implementation of slot logic in access points to determine time slot schedules for beacon intervals, along with the use of synch frames to synchronize devices with the channel, helps to reduce collisions and minimize power consumption by allowing devices to wake up only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If devices wake up frequently to access the channel, then communication responsiveness is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic beacon intervals with designated wake-up opportunities at specific time slots within each beacon interval. Devices wake up periodically at these scheduled opportunities rather than continuously or randomly, enabling them to stay in doze state for extended periods while maintaining the ability to access the channel when needed. This periodic structure resolves the contradiction by providing regular communication opportunities without requiring continuous device activation.
Solution Approach 2:
The access point transmits beacon frames in advance that contain wake-up opportunity information and channel access parameters. Devices use this preliminary information to plan their wake-up times and channel access strategies beforehand, allowing them to enter doze state with confidence that they will wake up at appropriate moments. This preliminary action eliminates the need for frequent or continuous wake-ups, reducing power consumption while maintaining responsiveness.
2Productivity
If multiple devices access the channel simultaneously, then communication efficiency is improved, but collision probability increases
Solution Approach 1:
The patent divides the beacon interval into multiple discrete time slots and assigns different wake-up opportunities to different devices or device groups. This segmentation of the channel access timeline allows multiple devices to access the channel in an organized sequence rather than simultaneously, reducing collision probability while maintaining overall communication efficiency through the coordinated multi-slot structure.
Solution Approach 2:
The patent introduces and utilizes the contention window parameter that devices adjust based on collision experience. When collisions occur, devices increase their contention window size, which randomizes their backoff times and spreads out their access attempts. This dynamic parameter adjustment changes the access pattern from potentially collision-prone simultaneous attempts to distributed temporal separation, resolving the contradiction between efficiency and collision avoidance.
3Use of energy by moving object
If devices stay in doze state continuously, then power consumption is reduced, but channel access latency increases
Solution Approach 1:
The patent establishes periodic beacon intervals with guaranteed wake-up opportunities at specific time slots. Devices can remain in doze state between these periodic opportunities, minimizing power consumption, while the regular interval structure ensures that latency is bounded and predictable. Devices know exactly when to wake up based on the beacon interval timing, avoiding both continuous operation and excessive waiting.
Solution Approach 2:
The access point monitors channel conditions and device behavior, then adjusts beacon interval parameters and wake-up opportunity timing based on observed latency requirements and collision patterns. This feedback mechanism ensures that the doze state duration is optimized - long enough to save power but not so long that it creates excessive latency. The system dynamically balances power savings and access speed based on real-world performance.
Data Source
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Figure 1E~1F
AI summary
Logic to coordinate communications of wireless communications devices to attenuate collisions, such as through coordination of communications by implementing slot logic in an access point. The slot logic may determine a time slot schedule for beacon intervals and may further transmit a synch frame at the time slot boundaries. If the channel is busy, the slot logic may not send the synch frame. The slot logic may also comprise distribution logic to determine a probability of collisions and to instruct one or more of the devices to spread out their channel accesses across beacons intervals to reduce the chance of collisions. A station associated with the access point may comprise synch logic to wake up at a slot boundary and wait for a synch frame or any other packets to synch to the medium.