NDP Feedback Report for Unassociated STA Channel Access
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Solution Overview
Problem
Current null data packet (NDP) feedback report mechanisms in wireless communications do not allow unassociated station devices (STAs) to make resource requests or access the medium, leading to high latency in dense environments where access points (APs) dominate channel access, hindering unassociated STAs' ability to transmit pre-association frames.
Innovation Solution
Modifying the NDP feedback report protocol to enable unassociated STAs to signal their intent to access the medium by using reserved allocations within the NDP feedback report mechanism, allowing them to transmit energy and request channel access, and adjusting the trigger frame to indicate available allocations for unassociated STAs, thereby facilitating their access through enhanced distributed channel access (EDCA).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If APs dominate channel access using current NDP feedback report mechanisms, then channel access control is maintained, but unassociated STAs experience high latency and cannot access the medium
Solution Approach 1:
The patent segments the feedback report mechanism by introducing a specific feedback type (e.g., feedback type 0) that unassociated STAs can use to request channel access. This segmentation allows different STA types (associated vs. unassociated) to use different feedback mechanisms, enabling unassociated STAs to access the medium without disrupting the overall channel access control structure.
Solution Approach 2:
The patent introduces an intermediary mechanism where the AP sends a trigger frame that explicitly invites unassociated STAs to provide feedback. This trigger frame acts as an intermediary signal that mediates between the AP's channel access control and the unassociated STAs' need to access the medium, allowing controlled opportunities for unassociated STAs to transmit.
2Adaptability or versatility
If the NDP feedback report protocol is modified to allow unassociated STAs to signal access intent, then channel access opportunities increase, but protocol complexity increases
Solution Approach 1:
The patent makes the NDP feedback report mechanism universal by enabling it to serve both associated and unassociated STAs. The same feedback report structure and trigger frame mechanism are used for both STA types, with the distinction made through feedback type indicators. This multi-functionality allows the protocol to handle different STA types without requiring entirely separate mechanisms, thus limiting the increase in complexity.
Solution Approach 2:
The patent changes parameters within the existing protocol structure, specifically introducing a feedback type parameter that indicates whether the feedback comes from an associated or unassociated STA. This parameter change allows the protocol to adapt to different STA types without fundamentally altering the protocol structure, thereby achieving versatility with minimal complexity increase.
3Duration of action of moving object
If contention periods are reserved based on number of requesting STAs, then sufficient transmission time is ensured, but resource allocation complexity increases
Solution Approach 1:
The patent applies preliminary action by having unassociated STAs indicate their channel access intent in advance through the feedback report mechanism. The AP receives these indications and prepares the appropriate contention periods and resource allocations before the actual transmission occurs. This preliminary indication allows the AP to plan resource allocation efficiently without requiring complex real-time decisions.
Solution Approach 2:
The patent uses feedback mechanisms where unassociated STAs provide information about their transmission needs through structured feedback reports. The AP uses this feedback to determine the number of contention periods needed and allocate resources accordingly. This feedback-driven approach allows dynamic resource allocation based on actual demand without requiring the AP to pre-allocate resources for all possible scenarios, thus limiting complexity increase.
Data Source
AI summary
This disclosure describes systems, methods, and devices related to null data packet (NDP) feedback report. A device may cause to send an NDP feedback report frame to one or more station devices, wherein the NDP feedback report frame comprises one or more resource allocations. The device may identify an allocation response using a first allocation of the one or more resource allocations from a first station device. The device may determine to assign one or more timeslots as contention based resources based on the allocation response.