Peer-to-peer QoS negotiation for WLAN latency
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Solution Overview
Problem
Current WLAN systems lack an efficient mechanism for resource allocation and Quality of Service (QoS) negotiation, particularly for latency-sensitive applications, leading to challenges in delivering timely and high-priority traffic.
Innovation Solution
The proposed solution involves a first station (STA) transmitting a request frame to an access point (AP) that includes QoS requirements for itself and potentially other associated STAs, allowing the AP to allocate transmission opportunities (TXOP) and manage resource allocation efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional WLAN resource allocation mechanisms are used, then system complexity is reduced, but QoS negotiation efficiency and latency performance deteriorate
Solution Approach 1:
The patent implements Target Wake Time (TWT) service periods that pre-schedule transmission opportunities for STAs before actual data transmission occurs. The AP and STAs negotiate and establish TWT parameters in advance, creating predetermined wake times and service periods for upcoming transmissions. This preliminary scheduling reduces latency by eliminating contention and wait times during actual data transfer, while the complexity is confined to the initial negotiation phase rather than every transmission.
Solution Approach 2:
The patent introduces dynamic resource allocation through Trigger Frames that allow the AP to reallocate transmission opportunities within established TWT service periods. The system transitions from static pre-scheduled allocations to dynamic adjustments based on actual traffic conditions, QoS requirements, and network state. This enables the system to adapt to changing conditions without abandoning the structured framework of TWT, balancing latency reduction with operational flexibility.
2Productivity
If multi-link operation (MLO) is implemented to reduce latency and increase throughput, then transmission performance improves, but system complexity increases
Solution Approach 1:
The patent combines multiple wireless links into a unified Multi-Link Device (MLD) architecture where the AP MLD coordinates resource allocation across all links. Instead of treating each link independently with separate management protocols, the system merges link management into a single coordinated framework. The AP MLD can allocate Transmission Opportunities (TXOPs) across multiple links simultaneously, achieving higher throughput while centralizing control to manage complexity.
Solution Approach 2:
The patent creates a universal resource allocation mechanism that operates across all links and all STAs uniformly. The TWT and Trigger Frame protocols serve multiple functions: they schedule transmissions, negotiate QoS, allocate resources, and coordinate multi-link operations through a single standardized interface. This multi-functional approach eliminates the need for separate management protocols for each link or STA type, reducing overall system complexity while maintaining high throughput capabilities.
3Reliability
If QoS negotiation is performed for each STA individually, then QoS requirements are precisely met, but negotiation overhead and time consumption increase
Solution Approach 1:
The patent merges QoS negotiation for multiple STAs into a single joint negotiation process. When a STA sends a QoS request, the AP evaluates the requirements of that STA along with other associated STAs and their traffic patterns, then returns a unified QoS response that addresses all parties. This combined negotiation reduces the number of separate negotiation exchanges, cutting down negotiation time and overhead while maintaining reliable QoS fulfillment through comprehensive multi-STA evaluation.
Solution Approach 2:
The patent performs preliminary QoS negotiation during the TWT service period establishment phase, before actual data transmission begins. By negotiating QoS parameters in advance as part of the TWT setup, the system eliminates the need for repeated QoS negotiations during ongoing transmissions. The AP and STAs agree on QoS expectations, transmission opportunities, and resource allocations beforehand, ensuring reliable QoS fulfillment while minimizing negotiation time overhead.
Data Source
AI summary
A first station (STA) in a wireless network transmits, to an access point (AP), a stream classification service (SCS) request for itself and on behalf of a second STA. The first STA receives, from the AP, a first SCS response for the SCS request for the first STA and a second SCS response for the SCS request for the second STA. The first STA or the second STA may receive a trigger frame granting a transmission opportunity (TXOP) via the AP, if the AP accepts the SCS request associated with that STA. Subsequently, the first STA or the second STA that receives the trigger frame may perform communication with the AP.