Uplink Retransmission Strategy for Wireless Gap Intervals
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Solution Overview
Problem
In wireless communications, the sharing of radio resources among multiple RAT modules can lead to gap intervals where essential UL grant messages and feedback messages are missed, resulting in inefficient UL data retransmission due to unknown retransmission parameters.
Innovation Solution
A communications apparatus analyzes feedback messages to determine the preferred retransmission type of a peer device and records it, allowing it to decide whether to retransmit UL data based on this type when the initial feedback message is not received, thereby adapting retransmission strategies during gap intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If radio resources are shared among multiple RAT modules, then resource utilization efficiency is improved, but feedback messages and UL grant messages may be missed during gap intervals
Solution Approach 1:
The patent applies preliminary action by predicting whether feedback messages or UL grant messages will be missed during gap intervals before actual transmission occurs. The system determines in advance whether a feedback message corresponding to first uplink data will be missed, and based on this prediction, proactively decides to perform retransmission using stored second uplink data, thereby preventing data loss before it happens.
2Loss of time
If feedback messages are missed during gap intervals, then retransmission timing is delayed, but retransmission efficiency deteriorates due to unknown retransmission parameters
Solution Approach 1:
The patent applies beforehand cushioning by storing second uplink data in advance in the buffer memory before the gap interval occurs. When feedback messages are missed during the gap, the system can immediately retrieve and retransmit the pre-stored second uplink data without needing to wait for retransmission parameters, thus cushioning against the potential delay and efficiency loss.
Solution Approach 2:
The patent applies copying by creating and storing a copy of uplink data (second uplink data) in the buffer memory before transmission. This copied data can be retrieved and retransmitted independently when feedback messages are missed, allowing the system to bypass the normal retransmission parameter dependency and maintain efficiency despite timing delays.
3Duration of action of moving object
If retransmission is performed without knowing retransmission parameters, then transmission continuity is maintained, but data integrity may be compromised
Solution Approach 1:
The patent applies preliminary action by determining and storing appropriate retransmission parameters (second uplink data) before the gap interval occurs. When retransmission is needed, the system uses these pre-determined parameters rather than attempting to obtain them after the gap, thus maintaining both transmission continuity and data integrity through advance preparation.
Data Source
AI summary
A communications apparatus includes a radio transceiver and a processor. The radio transceiver receives a plurality of feedback messages from a peer device. The feedback messages are transmitted by the peer device to indicate a result of UL data transmission. The processor analyzes content of the feedback messages to determine a preferred retransmission type of the peer device and records the preferred retransmission type of the peer device in a memory device. When the radio transceiver receives a first UL grant message indicating transmission of a first UL data and the processor determines that a forthcoming first feedback message corresponding to the transmission of the first UL data is unable to be received, the processor determines whether to retransmit the first UL data according to the preferred retransmission type of the peer device.