PHY Layer Semi-Persistent Uplink Data Retransmission
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Solution Overview
Problem
In communication systems, when the PHY layer fails to send data on semi-persistent uplink resources, the MAC layer overwrites buffered data, leading to low data transmission performance as the previously buffered data is directly lost.
Innovation Solution
Implement a method where if the PHY layer has not sent first data on a first semi-persistent uplink resource, the PHY layer sends second data on a second semi-persistent uplink resource, which is either the first data buffered in the HARQ process or corresponding data, thereby avoiding data loss and improving transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the MAC layer overwrites buffered data when PHY layer fails to send data, then the system can quickly allocate resources for new data transmission, but the previously buffered data is directly lost leading to low data transmission performance
Solution Approach 1:
The patent applies preliminary action by having the PHY layer check whether data has been successfully sent before the MAC layer overwrites the buffered data. The PHY layer performs a preliminary verification of transmission status and, if necessary, retransmits the buffered data on alternative resources before the MAC layer proceeds with overwriting, thus preventing data loss while maintaining system efficiency
Solution Approach 2:
The patent implements feedback by establishing a status check mechanism where the PHY layer reports back to the MAC layer whether data transmission was successful. This feedback loop allows the MAC layer to determine whether to overwrite buffered data based on actual transmission outcomes, preventing premature overwriting and data loss while maintaining high productivity
2Reliability
If the PHY layer retransmits buffered data on alternative resources, then data loss is prevented, but the system complexity increases due to additional resource management
Solution Approach 1:
The patent applies self-service by enabling the PHY layer to autonomously handle retransmission of buffered data when transmission fails. The PHY layer independently checks transmission status, identifies alternative semi-persistent uplink resources, and performs retransmission without requiring complex MAC layer intervention, thus improving reliability while minimizing system complexity
Solution Approach 2:
The patent segments the data transmission function into distinct responsibilities: the PHY layer handles transmission and retransmission of buffered data, while the MAC layer manages higher-layer protocols. This segmentation allows the PHY layer to independently manage retransmission on alternative resources, improving reliability without significantly increasing overall system complexity
Data Source
AI summary
A data sending method and a terminal are provided. The method includes: if a PHY layer has not sent first data on a first semi-persistent uplink sending resource after a MAC layer of the terminal transmits the first data to the PHY layer, the PHY layer sends second data on a second semi-persistent uplink sending resource, where the second data is the first data buffered in a hybrid automatic repeat request (HARQ) process, or the second data is data corresponding to the first data buffered in the HARQ process.