Broadcast TWT Negotiation Using Traffic And Load Information
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Solution Overview
Problem
The IEEE 802.11ax Standard lacks mechanisms for an access point (AP) to know traffic characteristics of client stations during target wake time (TWT) negotiations and for client stations to know load information about broadcast TWT schedules, leading to inefficient scheduling that affects system throughput and power consumption.
Innovation Solution
Client stations provide traffic characteristic information during TWT negotiations, and APs share load information about broadcast TWT schedules through beacon frames, enabling more accurate scheduling that aligns with traffic demands and reduces load imbalance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If TWT schedules are negotiated without traffic characteristic information, then negotiation complexity is reduced, but scheduling efficiency and system throughput deteriorate
Solution Approach 1:
Client stations provide traffic characteristic information to the AP in advance during the TWT negotiation phase, enabling the AP to pre-calculate and optimize TWT schedules based on actual traffic needs before scheduling begins. This preliminary provision of information allows efficient scheduling without adding complexity to the negotiation process itself.
Solution Approach 2:
The patent implements a feedback mechanism where client stations communicate their traffic characteristics to the AP, which then uses this information to adjust and optimize TWT schedules. The AP leverages this feedback to make informed scheduling decisions that improve system throughput while maintaining manageable negotiation complexity.
2Ease of operation
If TWT schedules are negotiated without load information, then scheduling decisions are simpler, but load balance and power saving efficiency deteriorate
Solution Approach 1:
The AP provides load information about broadcast TWT schedules to client stations through feedback mechanisms. This enables client stations to make informed decisions about which schedules to join based on current network conditions, optimizing power saving efficiency while keeping the decision process straightforward through information provision rather than complex negotiation.
Solution Approach 2:
Client stations autonomously make scheduling decisions based on load information provided by the AP, without requiring complex multi-way negotiations. Each client station independently evaluates the provided load information and selects appropriate TWT schedules, simplifying the operation while achieving good load balance and power saving.
3Speed
If broadcast TWT schedules are established without load information, then setup process is faster, but load balance among client stations deteriorates
Solution Approach 1:
The AP collects and processes load information about broadcast TWT schedules in advance before client stations make joining decisions. This preliminary gathering of load information enables the AP to provide accurate scheduling guidance to client stations, achieving good load balance without slowing down the overall setup process.
Solution Approach 2:
The AP acts as an intermediary that collects load information from the network and translates it into scheduling recommendations for client stations. This intermediary role enables efficient load balancing by processing information centrally and distributing optimized scheduling decisions to multiple clients simultaneously, maintaining fast setup speed while achieving precise load balance.
Data Source
AI summary
A first communication device generates a beacon frame that includes i) parameters of a broadcast target wake time (TWT) schedule and ii) information regarding a quantity of client stations that have currently joined the broadcast TWT schedule. The first communication device transmits the beacon frame to inform one or more second communication devices of i) the parameters of the broadcast TWT schedule and ii) the quantity of client stations that have currently joined the broadcast TWT schedule.