Uplink Frame Transmission via OFDMA Trigger Frames
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless local area network (WLAN) systems face limitations in efficiently transmitting uplink frames, particularly in scenarios where multiple stations (STAs) need to communicate without a central management entity, leading to restricted bandwidth usage and reduced throughput due to the primary channel rule, which limits the allocation of wider bandwidth to terminals.
Innovation Solution
The implementation of an OFDMA-based method for uplink transmission, where the access point (AP) allocates different frequency resources to each STA, and the use of a trigger frame with association identifier information to manage resource units (RUs) for random access, allowing multiple terminals to use multiple channels simultaneously without the constraints of the primary channel rule.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the primary channel rule is used to manage uplink transmissions, then channel management is simplified, but bandwidth allocation is restricted and throughput is reduced
Solution Approach 1:
The patent segments the uplink transmission channel into multiple independent resource units (RUs) that can be allocated to different STAs simultaneously. Instead of using a single primary channel for all transmissions, the available bandwidth is divided into multiple sub-channels, allowing parallel transmissions and improving overall throughput while maintaining manageable complexity through structured resource allocation.
Solution Approach 2:
The patent transitions from a single-dimensional primary channel approach to a multi-dimensional resource allocation scheme. By introducing frequency-domain segmentation into the channel management structure, the system can allocate different frequency resources to different STAs, effectively adding a frequency dimension to channel management and enabling simultaneous multiple access without proportionally increasing management complexity.
2Reliability
If a central management entity (AP) is used to allocate resources, then uplink transmission coordination is improved, but systems without AP cannot efficiently manage random access
Solution Approach 1:
The patent enables STAs to perform self-service in resource allocation by allowing them to autonomously select resource units for transmission based on predefined rules and channel conditions. This self-service mechanism allows STAs in AP-less scenarios to independently manage their random access transmissions without requiring centralized coordination, thereby maintaining adaptability while ensuring reliable transmission through structured resource unit selection.
3Productivity
If wider bandwidth is allocated to multiple terminals, then throughput is improved, but channel management complexity increases
Solution Approach 1:
The patent segments the wide bandwidth into multiple manageable resource units (RUs), each of which can be independently allocated to different STAs. This segmentation transforms the complex task of managing wide bandwidth into simpler, discrete resource unit allocations, allowing the system to utilize wider bandwidth for improved throughput while keeping the management complexity manageable through standardized RU allocation procedures.
Data Source
AI summary
According to an embodiment of the present specification, a method for transmitting an uplink frame in a wireless local area network (WLAN) system and performed by a user station (STA) includes: receiving from an access point (AP) a trigger frame comprising association identifier information for orthogonal frequency division multiple access (OFDMA)-based random access and allocation information indicating a resource unit, wherein the association identifier information indicates any one of a first value irrelevant to whether being associated with the AP, a second value for a first STA group associated with the AP, and a third value for a second STA group un-associated with the AP; and performing a countdown operation according to the association identifier information based on a backoff value which is set in a backoff counter of the user STA in order to transmit the uplink frame.