RLC Recovery via MAC Feedback for Wireless Retransmission Delays
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Solution Overview
Problem
Wireless communication systems face delays in data transmission due to the lack of efficient retransmission mechanisms, particularly in scenarios where maximum retransmission attempts are reached without acknowledgment, leading to increased round-trip times and reduced throughput.
Innovation Solution
Configuring a maximum retransmission number and implementing a method where the transmitter's upper protocol layer initiates retransmissions based on input from the lower protocol layer, even if no acknowledgment is received, and utilizing a reordering timer to manage sequence number gaps, thereby reducing transmission delays and enhancing throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitter waits for acknowledgment before retransmitting data, then transmission reliability is improved, but transmission delay increases
Solution Approach 1:
The upper protocol layer proactively initiates retransmission before the lower layer receives acknowledgment, performing the retransmission action in advance based on predicted needs rather than waiting for confirmation
Solution Approach 2:
The system implements feedback mechanisms where the upper layer monitors lower layer transmission status and uses this information to trigger proactive retransmissions, creating a closed-loop control system that balances reliability and delay
2Reliability
If the maximum retransmission number is increased, then transmission reliability is improved, but system complexity increases
Solution Approach 1:
The system pre-configures the maximum retransmission number and establishes proactive retransmission triggers in advance, avoiding the need for complex real-time decision-making about whether to continue retransmitting
Solution Approach 2:
The system changes the retransmission parameter from a dynamic decision variable to a pre-configured constant value, simplifying the control logic while maintaining reliability through predictable retransmission behavior
3Loss of time
If the transmitter proactively retransmits without waiting for NACK, then transmission delay is reduced, but risk of redundant transmissions increases
Solution Approach 1:
The upper layer uses feedback from the lower layer transmission status to intelligently trigger proactive retransmissions only when necessary, avoiding redundant transmissions by monitoring actual acknowledgment patterns
Solution Approach 2:
The system dynamically adjusts its retransmission behavior based on real-time conditions, switching between waiting for acknowledgment and proactive retransmission modes depending on the specific transmission context and lower layer feedback
Data Source
AI summary
A wireless communication system and method are presented for reducing retransmission delays between a UE and an eNB. The UE is configured to establish a communication link to the eNB according to an interface protocol comprising at least a MAC layer and a RLC layer. The RLC layer is notified with at least a PDU data based on input from the MAC layer if no HARQ ACK is received when a maximum retransmission number is reached. A sequence number (SN) of the PDU may then be retransmitted from the RLC layer to the eNB.