PHY-Layer HARQ With PPDU Receiver ID for Faster Retransmissions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless local area networks, HARQ operations at the PHY layer level face challenges due to potential time delays and MAC header damage during retransmissions, which can hinder efficient communication.
Innovation Solution
Incorporating receiver ID information at the PHY layer within the PPDU to facilitate immediate identification of HARQ operations and ensure accurate communication without relying on the MAC layer, thereby reducing time delays and MAC header damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If HARQ operation is performed at PHY layer level, then communication speed and efficiency are improved, but reliability deteriorates due to potential MAC header damage during retransmissions
Solution Approach 1:
The patent separates the receiver ID information from the MAC layer and places it at the PHY layer within the PPDU structure. This segmentation allows the PHY layer to independently identify the receiving STA without relying on the MAC header, thus maintaining reliability while enabling fast HARQ operations at the PHY layer.
Solution Approach 2:
The patent introduces an intermediary mechanism where the receiver ID information acts as a bridge between the PHY layer and MAC layer. This intermediary allows the PHY layer to perform HARQ operations independently while ensuring that the receiving STA can be correctly identified even when MAC header damage occurs during retransmissions.
2Measurement precision
If receiver ID information is included at MAC layer, then identification accuracy is maintained, but time delay increases due to additional processing steps
Solution Approach 1:
The patent places the receiver ID information in the PPDU at the PHY layer in advance, before the MAC layer processing occurs. This preliminary action allows the receiving STA to be identified immediately upon receiving the PPDU, eliminating the need for additional MAC layer processing steps and reducing time delay while maintaining identification accuracy.
3Adaptability or versatility
If MAC header is used for HARQ identification, then protocol compatibility is maintained, but communication efficiency decreases due to header damage in retransmissions
Solution Approach 1:
The patent segments the identification function from the MAC header and places it at the PHY layer. This segmentation allows HARQ operations to be performed efficiently at the PHY layer without relying on the MAC header, avoiding the problem of header damage during retransmissions while maintaining protocol compatibility through the use of standard PPDU structure.
Data Source
AI summary
The present disclosure relates to a method for a hybrid automatic repeat request (HARQ) operation at a physical (PHY) layer level in a wireless local area network (LAN) system or an apparatus for performing same. The method is characterized in receiving, from a transmitting station (STA), a physical protocol data unit (PPDU) including a receiver identifier (ID) which is a physical (PHY) layer signal, performing an error check on the PPDU, based on the error check, transmitting an HARQ feedback frame which is a PHY layer signal, and receiving a retransmission PPDU.