Non-AP Station TXOP Sharing via MU-RTS Trigger Frames
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Solution Overview
Problem
Wireless communication systems face challenges in managing data transmission opportunities (TXOP) in scenarios with multiple devices of varying capabilities, leading to congestion, suboptimal channel utilization, and quality of service (QoS) issues, particularly in environments with devices like VR HMDs and edge servers, where end-to-end latency is critical.
Innovation Solution
A non-access point station (STA) shares its obtained TXOP with another STA or an access point (AP) using Multi-User Request-To-Send Transmission (MU-RTS) TXOP sharing mechanisms, such as MU-RTS TXS frames, to facilitate efficient data transmission and reduce latency, by allocating time in control frames or piggybacking allocations in uplink data frames, ensuring priority and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple devices with varying capabilities share the same communication channel, then device connectivity is improved, but channel congestion increases and utilization becomes suboptimal
Solution Approach 1:
The patent segments the communication channel into multiple virtual channels or time slots, allowing different devices with varying capabilities to access the channel without full congestion. This segmentation enables simultaneous operations for multiple devices while maintaining manageable interference levels and optimizing overall channel utilization.
Solution Approach 2:
The patent implements dynamic channel allocation and access control mechanisms that adapt to the varying capabilities and data transmission needs of different devices. The system dynamically adjusts transmission parameters, priority levels, and channel access rights based on real-time conditions, enabling efficient resource distribution among diverse devices.
2Reliability
If TXOP is allocated to ensure fair access for all devices, then QoS is improved, but transmission latency increases
Solution Approach 1:
The patent applies different TXOP allocation strategies tailored to the specific needs of individual devices or device groups. High-priority devices or those with critical latency requirements receive optimized TXOP assignments with reduced wait times, while other devices receive standard allocation. This localized quality adjustment maintains QoS fairness while minimizing overall latency.
Solution Approach 2:
The patent implements preliminary TXOP reservations and pre-allocation mechanisms where devices can reserve transmission opportunities in advance or where the system pre-allocates TXOPs based on predicted traffic patterns. This preliminary action reduces the need for contention-based delays and ensures low-latency transmission for critical data flows while maintaining fair access for all devices.
3Productivity
If TXOP sharing is implemented to improve efficiency, then channel access is optimized, but coordination complexity increases
Solution Approach 1:
The patent introduces an intermediary coordination mechanism, such as a central controller or distributed coordinator, that manages TXOP sharing decisions and reduces the coordination burden on individual devices. This intermediary handles the complex scheduling and conflict resolution centrally or locally, allowing devices to focus on simple data transmission while maintaining efficient channel access through automated coordination.
Data Source
AI summary
A non-access point station (STA1) configured for transmission opportunity (TXOP) sharing operations in a wireless local area network (WLAN) may allocate time in a TXOP obtained by the STA1 to an access point station (AP) or another non-AP STA (STA2) using a Multi-User Request-To-Send Transmission TXOP sharing (MU-RTS TXS) trigger frame subvariant.