Trigger Frame AID12 Subfield Configuration for EHT Resource Allocation
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Solution Overview
Problem
Current wireless LAN standards face challenges in providing super-high speed services for new multimedia applications, particularly in efficiently signaling multi-user information and resource allocation across different terminal generations within a wireless communication system.
Innovation Solution
A terminal and method for transmitting a trigger-based physical layer protocol data unit (PPDU) that includes a communication module and a processor, which receives a frame from an access point indicating PPDU transmission, and configures the AID12 subfield to allocate resources for uplink orthogonal frequency division multiple access (OFDMA)-based random access, allowing for efficient resource allocation across legacy and next-generation terminals using the same trigger frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single trigger frame is used to allocate resources for both legacy HE terminals and next-generation EHT terminals, then device complexity is reduced and backward compatibility is improved, but the ability to efficiently signal multi-user information and allocate resources specifically for EHT terminals deteriorates
Solution Approach 1:
The trigger frame is segmented into a common information field applicable to all terminals and user information fields specific to individual terminals. This segmentation allows the frame to simultaneously support both HE and EHT terminals while maintaining efficient multi-user signaling through the user information fields that can be selectively populated based on terminal type and resource allocation requirements.
Solution Approach 2:
The trigger frame structure is designed with universal applicability through the common information field that provides baseline parameters for all terminals, while the user information fields can be configured to serve specific terminal types. This multi-functionality enables a single frame format to handle both legacy HE and next-generation EHT terminals without requiring separate frame structures.
2Productivity
If the AID12 subfield is used to indicate PPDU format for EHT terminals, then signaling efficiency is improved, but compatibility with legacy HE terminals that do not support EHT deteriorates
Solution Approach 1:
The AID12 subfield is configured with specific value ranges to indicate different PPDU formats. By assigning particular values to represent EHT PPDU format while maintaining other values for legacy formats, the system achieves efficient signaling for EHT terminals while preserving compatibility with legacy HE terminals that interpret the same field differently based on their capability.
Solution Approach 2:
The interpretation of the AID12 subfield values is dynamic rather than static. Legacy HE terminals interpret the field based on their supported formats, while EHT terminals interpret it to identify EHT PPDU format. This dynamic interpretation allows the same signaling mechanism to serve both terminal types without requiring explicit compatibility markers.
Data Source
AI summary
Disclosed is a method for transmitting and receiving a PPDU in a wireless communication system. A terminal receives, from an access point (AP), a frame indicating transmission of a PPDU to one or more terminals and transmits the PPDU on the basis of an AID12 subfield included in the frame. In this case, if the PPDU indicated to be transmitted by the frame is an extremely high throughput (EHT) PPDU, a value of the AID12 subfield is configured to one of multiple values excluding at least one specific value, and the at least one specific value is used to allocate a resource for an uplink orthogonal frequency division multiple access (OFDMA)-based random access (UORA) of at least one terminal supporting high efficiency (HE).