Autonomous RLC Retransmission for Wireless Delay Reduction
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Solution Overview
Problem
In wireless communication systems, existing methods for RLC retransmission are delayed due to the reliance on Negative RLC feedback (NACK) from the receiver, which can lead to increased transmission delay and inefficiency, especially in scenarios requiring fast retransmission.
Innovation Solution
The implementation of an autonomous RLC retransmission method where the AM RLC transmitter retransmits a RLC PDU even if no Negative RLC feedback (NACK) is received, based on specific conditions such as channel quality, HARQ failure, or priority of data, allowing for immediate retransmission without waiting for feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AM RLC transmitter waits for Negative RLC feedback (NACK) from the receiver before retransmitting, then the retransmission reliability is improved, but the transmission delay increases
Solution Approach 1:
The transmitter performs preliminary retransmission based on predicted channel conditions or pre-configured criteria before receiving actual NACK feedback. This allows the retransmission to occur proactively rather than waiting for the feedback loop, thereby reducing delay while maintaining reliability through pre-planned retransmission triggers.
Solution Approach 2:
The system skips the waiting period for NACK feedback by implementing autonomous retransmission mechanisms that decide to retransmit based on local conditions such as channel quality indicators or pre-defined thresholds. This rushes through the feedback waiting time and directly performs retransmission when needed.
2Loss of time
If the AM RLC transmitter performs autonomous retransmission without waiting for NACK feedback, then the transmission delay is reduced, but the risk of unnecessary retransmission increases
Solution Approach 1:
The system uses alternative feedback mechanisms such as channel quality indicators (CQI), hybrid ARQ acknowledgments, or implicit feedback from the receiver to guide autonomous retransmission decisions. This feedback allows the transmitter to make informed retransmission decisions without waiting for explicit NACK messages, reducing energy waste on unnecessary retransmissions.
Solution Approach 2:
The transmitter dynamically adjusts retransmission parameters such as threshold values, retransmission probability, or timing based on changing channel conditions. This adaptive parameter adjustment ensures that autonomous retransmissions are performed only when channel conditions warrant them, avoiding unnecessary energy consumption while maintaining low latency.
3Productivity
If the system implements autonomous RLC retransmission based on multiple conditions, then the transmission efficiency is improved, but the device complexity increases
Solution Approach 1:
The autonomous retransmission control is segmented into multiple independent evaluation modules, each responsible for a specific condition (e.g., channel quality check, HARQ status check, priority level check). This modular segmentation allows the system to evaluate multiple conditions efficiently without creating a monolithic complex control structure, thereby improving transmission efficiency while managing device complexity.
Solution Approach 2:
The system implements a universal control framework that handles multiple retransmission scenarios and conditions through a single integrated mechanism. This multi-functional approach consolidates various retransmission decisions into one unified control structure, improving overall transmission efficiency across different scenarios without proportionally increasing device complexity.
Data Source
AI summary
The present invention relates to methods and devices for performing autonomous RLC retransmission in a wireless communication system. The methods involve and the devices perform transmitting a RLC PDU to a RLC receiver on a first transmission opportunity. When the RLC PDU is transmitted, a check is performed to determine if a condition for performing a RLC PDU retransmission procedure is met. If the condition is met, the RLC PDU is stored in a re-transmitter buffer and re-transmitted during consecutive transmission opportunities following the first transmission opportunity.