Non-AP STA Trigger Frames for Low-Latency TXOP Sharing
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Solution Overview
Problem
Current wireless communication systems using CSMA/CA lack the ability to efficiently support low latency delivery for real-time applications and do not allow non-AP stations to share their TXOP with other stations, leading to increased contention times and difficulty in meeting Quality-of-Service (QoS) requirements for real-time traffic.
Innovation Solution
A WLAN protocol where non-AP stations can obtain and share TXOPs, allowing them to inform the AP of buffer status and QoS requirements, enabling the AP to schedule transmissions during the shared TXOP to meet these needs, and supporting peer-to-peer transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If CSMA/CA random channel access is used, then channel access is simple and decentralized, but contention time becomes significant and latency requirement cannot be met
Solution Approach 1:
The patent segments the channel access process into two distinct modes: random access mode for general traffic and scheduled access mode for real-time traffic. This segmentation allows real-time applications to bypass the time-consuming random contention process by obtaining TXOPs through trigger frames, thereby reducing latency while maintaining the simplicity of random access for other traffic types.
Solution Approach 2:
The patent implements preliminary action by allowing STAs to request trigger frames in advance and by enabling the AP to pre-configure scheduled access parameters. This preliminary setup eliminates the need for real-time contention when real-time packets need transmission, as the access schedule is established beforehand, thus meeting strict latency requirements.
2Device complexity
If non-AP STA obtains TXOP alone, then transmission control is simple, but QoS requirement cannot be satisfied for multiple STAs
Solution Approach 1:
The patent introduces the AP as an intermediary that mediates between multiple STAs and the channel access mechanism. The AP receives trigger frame requests from STAs, collects buffer status information, and schedules TXOPs accordingly. This intermediary approach enables the AP to manage QoS requirements for multiple STAs while keeping the overall control mechanism relatively simple through centralized coordination.
Solution Approach 2:
The patent implements feedback mechanisms where STAs report their buffer status to the AP, and the AP uses this information to adjust TXOP allocations. This feedback loop ensures that QoS requirements are met by dynamically adapting the transmission schedule based on actual buffer conditions, while maintaining manageable control complexity through automated decision-making.
3Productivity
If TXOP sharing is enabled, then multiple STAs can transmit simultaneously reducing contention time, but protocol complexity increases
Solution Approach 1:
The patent makes the trigger frame mechanism universal by allowing any STA to request a trigger frame for TXOP sharing, not just APs. This multi-functional approach enables both AP-initiated and STA-initiated scheduled access, increasing throughput efficiency while managing protocol complexity through a unified trigger frame-based control structure that handles various access scenarios.
Data Source
AI summary
A wireless communication apparatus, system or method for operation on a network utilizing CSMA/CA, in which non-AP stations can share their TXOP. After obtaining a TXOP, a non-AP station informs the AP to share the TXOP within its BSS. The AP collects buffer status and the QoS requirements of the buffer from the stations and arranges transmissions during the shared TXOP to satisfy the QoS requirement of the buffer reported by the STAs. The non-AP station can also share its TXOP through the AP using trigger frames or other mechanisms. The AP station may be part of a multi-link device and the AP can arrange transmissions on multiple links of an MLD.