PHY Layer Data Retransmission via Unified FARQ Protocol
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Solution Overview
Problem
In mobile communication systems, the separate data retransmission functions performed by the MAC and PHY layers using ARQ and HARQ schemes lead to increased signaling load, delay, and redundant data transmission, as both layers independently handle ACK and NACK information, resulting in inefficient data retransmission.
Innovation Solution
The integration of data retransmission functions between the MAC and PHY layers using a Fast Automatic Retransmission Request (FARQ) scheme, where the PHY layer performs data retransmission and ACK/NACK information transmission, while the MAC layer does not, minimizing signaling load and preventing redundant data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate data retransmission functions are performed by MAC and PHY layers using ARQ and HARQ schemes, then data transmission reliability is improved, but signaling load and delay increase
Solution Approach 1:
The patent merges the separate ARQ and HARQ retransmission functions into a unified FARQ scheme at the PHY layer. The PHY layer now handles both automatic retransmission requests and hybrid ARQ operations, eliminating the need for separate MAC layer ARQ processing. This consolidation reduces the number of independent signaling paths and decision points, thereby reducing overall signaling delay while maintaining transmission reliability through the combined retransmission mechanisms.
Solution Approach 2:
The patent extracts the ARQ retransmission function from the MAC layer and relocates it to the PHY layer. By removing the separate MAC layer ARQ processing and integrating it into the PHY layer's HARQ framework, the system eliminates redundant signaling operations. The PHY layer now independently manages all retransmission decisions, reducing the signaling overhead and delay associated with inter-layer coordination while preserving data transmission reliability.
2Reliability
If both MAC and PHY layers independently handle ACK and NACK information, then data transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines the independent ACK/NACK handling mechanisms of the MAC and PHY layers into a single unified process at the PHY layer. Instead of maintaining separate recognition and processing paths for ARQ and HARQ acknowledgments, the system now uses a single FARQ mechanism that handles all retransmission control functions. This merger reduces the complexity of the retransmission system by eliminating redundant components while maintaining comprehensive data transmission reliability through the integrated approach.
3Reliability
If separate ARQ and HARQ schemes are used at MAC and PHY layers, then data transmission reliability is improved, but redundant data transmission occurs
Solution Approach 1:
The patent extracts the ARQ retransmission function from the MAC layer and consolidates it with the HARQ function at the PHY layer. By removing the separate MAC layer ARQ operation, the system eliminates the redundancy of transmitting the same data through both ARQ and HARQ mechanisms. The unified FARQ scheme at the PHY layer manages all retransmission needs, preventing duplicate data transmissions while maintaining comprehensive error correction and acknowledgment handling for reliable data transmission.
Data Source
AI summary
In retransmitting data at high speed by a PHY layer in a mobile communication system, when data to be transmitted to the receiver is received from the MAC layer of the transmitter, the PHY layer of the transmitter transmits the data to the PHY layer of the receiver, receives first information representing normal reception or abnormal reception of the data from the PHY layer of the receiver, notifies the MAC layer of the transmitter of the normal reception of the data when the first information represents the normal reception, and retransmits the data to the PHY layer of the receiver when the first information represents the abnormal reception.