Full-Duplex PPDU Preemption for High-Priority WLAN Traffic
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Solution Overview
Problem
High priority traffic is often hindered by ongoing lower priority data transmissions in wireless networks, particularly in Full Duplex (FD) stations that simultaneously transmit and receive.
Innovation Solution
Mechanisms are introduced to allow higher priority traffic to request and preempt ongoing lower priority transmissions by detecting third-party transmissions using punctured resources and reserved channel indications, enabling full duplex communication between stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Full Duplex communication is implemented to simultaneously transmit and receive, then communication efficiency is improved, but high priority traffic is hindered by ongoing lower priority transmissions
Solution Approach 1:
The patent applies preliminary action by having the low priority station indicate its ongoing transmission in advance through a indication field in the PPDU preamble. This allows the high priority station to detect the ongoing transmission before it completes, enabling preemptive suspension of the low priority transmission to accommodate high priority traffic.
Solution Approach 2:
The patent implements feedback through a preemption response mechanism where the low priority station receives a response frame from the high priority station indicating whether to suspend transmission. This feedback loop enables dynamic adjustment of transmission behavior based on priority requirements.
2Stability of the object's composition
If ongoing low priority PPDU transmission is allowed to complete, then transmission continuity is maintained, but high priority traffic cannot be transmitted
Solution Approach 1:
The patent applies dynamics by making the transmission process adjustable and flexible. The low priority station can dynamically suspend its transmission based on priority indicators and preemption responses, transitioning from a static continuous transmission model to a dynamic priority-based model that adapts to changing network conditions.
Solution Approach 2:
The indication field in the PPDU preamble provides advance notice of the low priority transmission's presence, allowing the high priority station to prepare for potential preemption and suspend the low priority transmission when necessary to accommodate high priority traffic.
3Reliability
If preemption mechanism is added to interrupt ongoing transmissions, then high priority traffic delivery is improved, but protocol complexity increases
Solution Approach 1:
The patent merges the preemption indication functionality into the existing PPDU preamble structure by adding an indication field that reuses existing fields (such as duration or other control fields). This integration approach minimizes additional complexity while achieving the preemption functionality.
Solution Approach 2:
The response frame mechanism serves multiple functions: it communicates preemption decisions, manages transmission suspension, and maintains protocol compatibility. This multi-functionality reduces the need for separate dedicated structures for each function.
Data Source
AI summary
A wireless local area network (WLAN) having stations (STAs) using Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) in which at least some stations support Full Duplex (FD) transmission. Mechanisms are described in which a STA can send a preemption request to a station performing ongoing transmissions. The preempted STA detects a preemption request of this preempting STA. The preempted STA interrupts its ongoing transmission; if it has determined to accept the preemption request. Thus, the preempting STA preempts the transmission of the preempted STA, to send a preemptive transmission, after receiving notification that the preempted STA has interrupted its ongoing transmission.