Trigger Frame User Info List for Multi-RU Allocation
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Solution Overview
Problem
Existing WLAN systems, such as IEEE 802.11ax, can only allocate one resource unit (RU) to one station (STA), limiting the efficiency of resource utilization and preventing STAs from knowing how many uplink resources are allocated to them.
Innovation Solution
The proposed solution involves a method where a transmitting STA receives a trigger frame containing a user information list with multiple user information fields, allowing it to allocate multiple RUs to one receiving STA. The STA can then transmit data through these allocated RUs, enabling efficient resource utilization and allowing the STA to determine its allocated uplink resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If only one RU is allocated to one STA in existing WLAN systems, then the system structure remains simple and easy to manage, but resource utilization efficiency is limited and STAs cannot know how many uplink resources are allocated to them
Solution Approach 1:
The user information list is segmented into multiple user information fields, where each field corresponds to a specific RU allocation. The trigger frame is divided into multiple segments (common information field, user information list, padding field) to organize the complex allocation information systematically. This segmentation allows multiple RUs to be allocated to one STA while maintaining structured management.
Solution Approach 2:
The patent introduces a new dimension in resource allocation by allowing one STA to occupy multiple RUs simultaneously across different frequency resources. This transforms the traditional one-to-one mapping into a many-to-one mapping from RU to STA, effectively utilizing frequency domain resources without increasing time slot complexity.
2Productivity
If multiple RUs are allocated to one STA, then data transmission efficiency improves, but the complexity of resource allocation signaling and processing increases
Solution Approach 1:
The trigger frame structure is designed with multi-functionality to handle both single-RU and multi-RU allocations uniformly. The user information list can accommodate multiple user information fields, each describing an RU allocation, allowing the same signaling mechanism to serve different allocation scenarios without requiring separate protocols.
Solution Approach 2:
The access point (AP) acts as an intermediary that manages the complex resource allocation and translates it into structured trigger frames. The AP processes the resource allocation decisions and encapsulates them in the trigger frame format, shielding STAs from the complexity of resource management while enabling efficient multi-RU allocations.
3Loss of time
If STAs do not read the rest of the User Info field after finding their allocation, then processing time is reduced, but STAs cannot determine how much uplink resources are allocated to them
Solution Approach 1:
The trigger frame includes a RU allocation field in the common information field that provides preliminary information about the total number of RUs allocated. STAs can use this preliminary information to quickly determine their total uplink resource allocation without needing to parse the entire user information list, reducing processing time while maintaining information completeness.
Data Source
AI summary
In a wireless local area network system, a transmitting station (STA) may receive a trigger frame including a user information list. The user information list comprises first and second user information fields, wherein the first user information field includes information related to a first resource unit (RU) for the transmitting STA, and the second user information field may include information related to the second RU for the transmitting STA. The transmitting STA may transmit first data through the first RU and transmit second data through the second RU.