TWT Multi-Connection Mechanism for Non-Overlapping AP Scheduling
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Solution Overview
Problem
The increasing number of wireless devices leads to high levels of interference and channel contention in wireless communication networks, which degrades network performance and limits the ability to meet user demands, despite advancements in IEEE 802.11ax standards like MU-MIMO and OFDMA, as existing power save mechanisms struggle with multi-AP connections and overlapping beacon slots.
Innovation Solution
Implementing a Target Wake Time (TWT) based multi-connection mechanism that allows stations to negotiate non-overlapping TWT service periods with multiple Access Points (APs), enabling efficient power saving and scheduling by determining unique wake-up times for each AP connection, thereby reducing contention and packet drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stations use traditional power save mechanisms with beacon listening, then they can maintain connection with APs, but channel contention and interference increase due to overlapping beacon slots from multiple APs
Solution Approach 1:
The patent implements periodic TWT service periods where stations wake up at predetermined, non-overlapping time intervals to communicate with different APs. This periodic scheduling eliminates continuous beacon listening and ensures that stations are awake and listening to data from only one AP at a given moment, thereby reducing channel contention and interference while maintaining reliable connections.
Solution Approach 2:
The patent dynamically negotiates TWT service periods between stations and multiple APs, allowing the wake-up schedule to be adapted based on traffic requirements and network conditions. This dynamic scheduling enables stations to optimize their wake-up times for each AP connection, improving reliability while minimizing interference with other APs.
2Adaptability or versatility
If stations maintain connections with multiple APs simultaneously, then roaming and redundancy are improved, but packet drops occur due to overlapping TWT service periods
Solution Approach 1:
The patent segments the communication schedule by dividing TWT service periods into distinct, non-overlapping time slots for different APs. This segmentation ensures that when a station is awake and listening to data from one AP, it is not simultaneously listening to another AP, thereby eliminating packet drops caused by overlapping service periods while maintaining multi-AP connections for roaming and redundancy.
3Reliability
If stations continuously listen to beacons from multiple APs, then connection awareness is maintained, but power consumption increases
Solution Approach 1:
The patent replaces continuous beacon listening with periodic TWT service periods where stations wake up only at predetermined times to communicate with APs. This periodic operation maintains connection awareness through scheduled communications while dramatically reducing power consumption by keeping the radio in sleep mode between service periods.
Data Source
AI summary
Systems, methods, and computer readable mediums for a TWT based multi-connection mechanism include sending, by a station, a first request for a first Target Wake Time (TWT) session with a first access point, wherein the first TWT session is established, determining, by the station and based on the first TWT session, a timing for a second TWT session such that a plurality of service periods of the first TWT session do not overlap with a plurality of service periods of the second TWT session, sending, by the station, a second request for the second Target Wake Time (TWT) session with a second access point, and wherein the second. TWT session is established, and receiving, by the station, data from the first AP during a service period of the first TWT session and data from the second AP during a service period of the second TWT session.