Trigger Frame Duration Signaling for WLAN Uplink Resource Allocation
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Solution Overview
Problem
Wireless local-area networks (WLANs) face challenges in efficiently managing bandwidth and response times due to multiple devices sharing resources, with legacy devices often limited by their communication protocols and hardware, and the need to operate with both new and legacy protocols.
Innovation Solution
Implementing a method for signaling uplink frame duration in WLANs using a trigger frame that includes a duration field, allowing HE stations to transmit UL PPDUs based on the indicated length, and enabling legacy devices to defer using the wireless medium, thereby optimizing resource allocation and reducing contention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple devices share the same wireless resources, then network coverage and device compatibility are improved, but bandwidth utilization and response times deteriorate
Solution Approach 1:
The patent segments the wireless medium access into two distinct mechanisms: scheduled access for HE devices (which can decode trigger frames and transmit at specific times) and contention-based access for legacy devices. This segmentation allows different device types to operate in separate time/frequency resources, improving overall bandwidth utilization while maintaining compatibility with both legacy and advanced devices
Solution Approach 2:
The trigger frame acts as an intermediary mechanism that coordinates uplink transmissions. It contains duration information that mediates between HE devices (which use scheduled access) and legacy devices (which use contention-based access), allowing the system to manage resource allocation efficiently while maintaining compatibility across different device types
2Ease of operation
If legacy devices use contention-based access, then protocol simplicity is maintained, but network contention and resource conflicts increase
Solution Approach 1:
The patent applies local quality by allowing legacy devices to maintain their simple contention-based access protocol in specific scenarios (when they cannot decode trigger frames), while HE devices use the more efficient scheduled access mechanism. Each device type operates with the access method best suited to its capabilities, optimizing overall network performance without requiring legacy devices to change their simple protocol
3Productivity
If HE devices use scheduled access with trigger frames, then bandwidth efficiency is improved, but device complexity and protocol requirements increase
Solution Approach 1:
The system dynamically adapts the access method based on device capabilities. HE devices that can decode trigger frames use scheduled access for efficient bandwidth utilization, while legacy devices continue using contention-based access. The trigger frame itself is dynamic, containing duration information that adjusts resource allocation in real-time based on network conditions and device types present
Data Source
AI summary
Computing readable media, apparatuses, and methods for signaling UL frame duration in wireless local-area networks. An apparatus of a wireless device is disclosed. The apparatus comprising processing circuitry, the processing circuitry configured to: encode a trigger frame for an uplink (UL) multi-user (MU) communication, the trigger frame including a media access control (MAC) portion including one or more station identifications and a length field to indicate an UL physical layer convergence procedure (PLCP) protocol data unit (PPDU) (UL-PPDU) length, the MAC portion further including a duration field to indicate a time period for other stations to set network allocation vectors. The processing circuitry further configured to: configure the access point to transmit the trigger frame, and decode UL-PPDUs from one or more stations identified by the one or more stations identifications, where a length of each of the UL-PPDUs is to be in accordance with the UL-PPDU length.