Trigger Frame Resource Unit Allocation for Wi-Fi Direct Link
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Solution Overview
Problem
The 802.11ax standard is not adapted to handle bandwidth-demanding communication services like video-based applications in high-density environments, leading to increased latency and collisions due to competition between direct link and multi-user transmission schemes.
Innovation Solution
Integrating direct link transmissions into the access point's scheduling policy by using a trigger frame that allocates resource units for both data transmission and acknowledgment, allowing non-AP stations to respond within the same MU transmission opportunity, reducing the need for separate medium access and signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct link transmissions are performed separately from MU transmissions, then direct link communication can be established, but latency increases and collisions occur due to competition for medium access
Solution Approach 1:
The patent merges direct link transmissions with MU transmissions by integrating them into a single coordinated framework. The AP schedules both direct link and MU transmissions within the same transmission opportunities, allowing stations to switch between transmission modes without leaving the protected time window. This eliminates the need for separate medium access procedures and reduces collisions between direct link and MU transmissions.
Solution Approach 2:
The AP performs preliminary scheduling of direct link transmissions within the MU transmission framework. By pre-allocating resource units and determining transmission parameters before the actual transmission occurs, the system avoids last-minute medium access decisions that could lead to collisions and latency. The AP's centralized control enables proactive coordination of all transmissions.
2Adaptability or versatility
If all communications go through the AP in MU transmissions, then centralized scheduling is achieved, but air time is doubled and medium access time increases
Solution Approach 1:
The patent segments the communication flow by allowing direct link transmissions to occur between stations without returning to the AP. Instead of AP→Station→AP (double air time), direct links enable AP→Station→Direct Link Station, eliminating the return trip to AP for certain traffic types. This segmentation reduces air time while maintaining AP's scheduling authority through resource unit allocation.
3Ease of operation
If separate medium access is used for direct link and MU transmissions, then each transmission type can be independently controlled, but collisions increase and throughput decreases
Solution Approach 1:
The patent creates a universal transmission framework where the AP's scheduling mechanism handles both MU and direct link transmissions through a common procedure. The same trigger frame structure, resource unit allocation, and transmission coordination apply to both transmission types. This multi-functional approach eliminates the need for separate control mechanisms while increasing throughput through reduced collisions and streamlined medium access.
Data Source
AI summary
Aspects of the present disclosure generally relate to enhanced multi-user (MU) uplink (UL) protocols in wireless networks that allow non-UL transmissions to be performed simultaneously with triggered MU UL transmissions. A station may send a trigger frame triggering MU transmissions with an appropriate signaling to allow non-UL transmissions, i.e. transmission to another station, in a resource unit of the MU transmission. Examples of non-UL transmissions include Direct Link transmissions as well as downlink (DL) transmissions. The present disclosure regards how acknowledgment of or response to such transmissions can be efficiently performed. A response resource unit to be used within a MU transmission by the DiL/DL destination station to send a response to the (DiL/DL) data transmission may be signaled in the trigger frame triggering the DiL/DL transmissions in appropriate resource units.