Wireless Terminal LL Queue Control for Real-Time WLAN Latency
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Solution Overview
Problem
Existing wireless LAN systems struggle to suppress latency for real-time applications (RTAs) like video games and industrial robot control due to VO transmission queues being overwhelmed by high-priority data, leading to potential queue overflow and data discard.
Innovation Solution
Implementing a system with separate low-latency (LL) transmission queues (LL1, LL2, LL3) with stricter latency conditions than VO, prioritizing LL data through CSMA/CA with tailored access parameters, and managing data collisions to ensure timely transmission of RTA data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If RTA data is input to VO transmission queue to suppress latency, then transmission priority is improved, but queue overflow occurs and data is discarded
Solution Approach 1:
The patent segments the transmission queue system by introducing a dedicated LL transmission queue separate from the VO transmission queue. This segmentation allows RTA data to be transmitted through a specialized queue designed for low-latency requirements, preventing overflow in the VO queue while maintaining high transmission priority through CSMA/CA with tailored access parameters.
2Productivity
If VO transmission queue is used for RTA data, then transmission priority is improved, but queue size is exceeded
Solution Approach 1:
The patent creates a separate LL transmission queue specifically designed to handle RTA data with large sizes. This dedicated queue has appropriate capacity allocation for RTA workloads, preventing the VO queue from being overwhelmed while maintaining high transmission speed through prioritized CSMA/CA access.
Solution Approach 2:
The patent applies parameter changes by configuring CSMA/CA with tailored access parameters specifically for the LL queue. These parameters include adjusted arbitration interframe space (AIFS), contention window sizes, and transmission opportunity limits that optimize the queue's capacity and transmission efficiency for RTA data characteristics.
3Loss of time
If separate LL queues are implemented, then latency suppression is improved, but system complexity increases
Solution Approach 1:
The patent segments traffic handling into distinct queues (VO and LL) with dedicated management mechanisms. While this increases structural complexity, it simplifies the management logic for each queue type by applying specialized CSMA/CA parameters only where needed, rather than attempting to manage all traffic uniformly.
Solution Approach 2:
The patent introduces an intermediary classification mechanism that directs RTA data to the LL queue based on latency requirements. This intermediary layer manages the complexity by providing a clear decision boundary for queue selection, simplifying the overall system management through structured traffic classification and routing.
Data Source
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AI summary
A terminal (20) includes a transmission control unit (203). The transmission control unit (20) sets a plurality of LL transmission queues (113_LL1, 113_LL2, 113_LL3), into each of which is input low latency data, regarding which latency conditions relating to latency are stricter than predetermined latency conditions. The latency conditions demanded of the low latency data that is input are different from each other among the plurality of LL transmission queues (113_LL1, 113_LL2, 113_LL3).