Multiuser Access Trigger Frame Coordination for Uplink Resource Efficiency
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Solution Overview
Problem
In uplink multi-user orthogonal frequency division multiple access (OFDMA) systems, lack of coordination between user stations (STAs) leads to signal interference and access failures due to the use of the same resources for uplink access.
Innovation Solution
A method and apparatus where an access point (AP) broadcasts a trigger frame with a preset condition, and STAs send uplink access signals using resource groups allocated by the AP, with the AP determining if the identifier sequences match the allocated resource groups to ensure proper access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If STAs perform uplink access without coordination, then access flexibility is improved, but signal interference occurs and access success rate deteriorates
Solution Approach 1:
The access point performs preliminary actions by allocating resource groups and identifier sequences to STAs before uplink access. The AP sends trigger frames containing resource allocation information, and STAs prepare their identifier sequences in advance based on these allocations. This preliminary coordination prevents resource conflicts during actual access while maintaining flexibility in resource distribution.
Solution Approach 2:
The system implements feedback mechanisms where the access point monitors uplink signals and provides responses to STAs. The AP detects whether received identifier sequences match allocated resource groups and sends acknowledgment frames to inform STAs of their access status. This feedback loop enables coordinated access by allowing STAs to adjust their behavior based on AP decisions, resolving the contradiction between flexibility and reliability.
2Productivity
If STAs use the same resource for uplink sending, then resource utilization is improved, but signal interference increases and access fails
Solution Approach 1:
The access point segments the uplink resource space by creating multiple resource groups, where each group is assigned to specific STAs. Instead of allowing all STAs to use the same resource, the AP divides resources into distinct segments (resource groups) with unique identifier sequences. This segmentation eliminates signal interference while maintaining high resource utilization through efficient allocation of segmented resources to multiple users.
3Reliability
If the AP allocates resource groups to STAs, then access coordination is improved, but system complexity increases
Solution Approach 1:
The trigger frame structure is designed to be universal and multi-functional, serving both as a resource allocation mechanism and as a coordination signal. The same trigger frame carries resource group allocation information, identifier sequence assignments, and access timing instructions. This multi-functionality reduces system complexity by consolidating multiple control functions into a single standardized message format, avoiding the need for separate signaling protocols.
Data Source
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AI summary
The present invention relates to the field of wireless communications, and in particular, to a multiuser access method and apparatus. The method is: broadcasting, by an AP, a first trigger frame to a STA within coverage of the AP, where the first trigger frame carries a preset condition, to request a STA that meets the preset condition to send an uplink access signal in a specified time after receiving the first trigger frame; receiving, by the AP, an uplink access signal sent by at least one STA, where the uplink access signal includes an identifier sequence; and when determining that an identifier sequence included in a received uplink access signal is the same as an identifier sequence included in a resource group allocated by the AP to a STA that sends the uplink access signal, determining, by the AP, that the STA that sends the uplink access signal meets the preset condition. Therefore, uplink resource use efficiency is effectively improved.