Random Access NFRP Trigger Frame for Wireless Feedback Efficiency
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Solution Overview
Problem
The existing Null-Data-Packet (NDP) Feedback Report procedure in wireless communication networks suffers from low efficiency due to limited random access capabilities, resulting in unused or collided resource units, which decreases network efficiency, especially in dense environments.
Innovation Solution
A communication method that allows for random access to resource unit tone sets using a Null Data Packet Feedback Report Poll trigger frame with a predefined Association Identifier (AID) value, enabling feedback report responses from a larger group of stations and dynamically adjusting access schemes based on network conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the NDP Feedback Report procedure uses a limited set of continuous AIDs for polling stations, then the procedure can be implemented with existing standards, but the number of stations that can provide feedback is limited and does not adapt to dense networks
Solution Approach 1:
The invention segments the feedback collection process into two distinct phases: a first phase using random access to RU tone sets for initial feedback, and a second phase using scheduled access for additional feedback. This segmentation allows the system to handle a larger number of stations by dividing the task into manageable parts, improving adaptability without overwhelming complexity in a single mechanism.
Solution Approach 2:
The invention introduces dynamic AID assignment where AIDs are allocated based on station behavior and network conditions rather than fixed continuous ranges. The AP can dynamically assign AIDs to stations that have not yet provided feedback, allowing the system to adapt to varying numbers of stations in dense networks while maintaining manageable complexity through dynamic rather than static management.
2Productivity
If random access is provided to RU tone sets in the NDP Feedback Report procedure, then more stations can participate in feedback reporting, but collisions occur between stations transmitting on the same RU
Solution Approach 1:
The invention segments the RU tone sets into multiple groups and divides stations into different sets based on their AIDs. Stations are assigned to different RU tone set groups, and only stations in the same group can access a particular RU simultaneously. This segmentation reduces collisions by ensuring that stations with overlapping AID ranges do not contend for the same RU, thereby improving both productivity and reliability.
Solution Approach 2:
The invention applies different access rules to different RU tone sets based on local conditions. Each RU tone set is associated with specific AID ranges, and stations are granted access rights tailored to their local AID assignments. This local differentiation ensures that stations with similar AIDs access different RUs, reducing collisions while maintaining high participation rates.
3Reliability
If the AP polls stations using scheduled AIDs in the NDP Feedback Report procedure, then collisions are minimized, but stations with AIDs outside the polled range cannot provide feedback
Solution Approach 1:
The invention makes the feedback collection mechanism universal by allowing any station with a valid AID to participate in feedback reporting, regardless of whether the AID falls within the initial polled range. The system combines random access mechanisms with scheduled access, enabling stations with various AID assignments to provide feedback through appropriate channels, thereby achieving both completeness and efficiency.
Solution Approach 2:
The invention dynamically adjusts the polling strategy based on network conditions and station AID assignments. The AP can dynamically determine which stations need to be polled and assign them to appropriate RU tone sets or groups. This dynamic approach ensures that all stations with valid AIDs can provide feedback while maintaining efficient network operation, resolving the contradiction between completeness and efficiency.
Data Source
AI summary
The invention provides a random access mechanism for short feedback procedure. An AP provides a random-access NFRP trigger frame defining a random access for the stations to a plurality of RU tone sets. A non-AP station randomly selects a responding RU tone set from the plurality of RU tone sets and send a NDP feedback report response on the selected responding RU tone set. A dedicated backoff counter may be used for the purposes of contention to the random RU tone sets. A subsequent UL MU transmission can then be scheduled by the AP for the NDP responding stations. No unused RU is expected, improving the random-access network efficiency. Also, the number of non-AP stations that can be targeted by the random-access NFRP trigger frame can be easily increased.