NR Retransmission Overhead Reduction via AMD PDU Sequence Number Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the New Radio (NR) system, the existing protocol leads to unnecessary overhead due to repeated polling for previously sent Acknowledged Mode Data (AMD) Protocol Data Units (PDUs), causing inefficient resource utilization.
Innovation Solution
A method where the transmission side stops transmitting detection indications for AMD PDUs when the Sequence Number (SN) of a specific PDU matches a predetermined value, resetting or restarting timers to manage retransmissions effectively, thereby reducing unnecessary overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission side repeatedly polls for previous AMD PDU to confirm receipt status, then the reliability of data transmission is improved, but unnecessary overhead is generated and resource utilization deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-delivering multiple AMD PDUs to the MAC layer before actual transmission. The RLC layer delivers a batch of PDUs (including future sequence numbers) to the MAC layer in advance, so that when these PDUs are transmitted and acknowledged, the RLC layer can immediately stop polling for those sequence numbers without needing to re-request delivery. This prevents the repeated polling overhead while maintaining reliable transmission confirmation.
2Reliability
If the detection retransmission timer is continuously maintained to query receiving situation, then the reliability of receiving status confirmation is improved, but the complexity of retransmission management increases and unnecessary overhead is generated
Solution Approach 1:
The patent applies preliminary action by pre-delivering multiple AMD PDUs to the MAC layer before actual transmission. The RLC layer delivers a batch of PDUs (including future sequence numbers) to the MAC layer in advance, so that when these PDUs are transmitted and acknowledged, the RLC layer can immediately stop polling for those sequence numbers without needing to re-request delivery. This prevents the repeated polling overhead while maintaining reliable transmission confirmation.
Solution Approach 2:
The patent applies dynamics by making the detection retransmission timer behavior adaptive rather than static. The timer is started or restarted when AMD PDU is delivered to MAC layer, and stopped when the corresponding SN is received in state report. This dynamic timer management adjusts the polling behavior based on actual transmission progress, reducing unnecessary complexity while maintaining reliable receiving status confirmation.
3Productivity
If pre-processing delivers multiple AMD PDUs to MAC layer in advance, then transmission efficiency is improved, but the transmission side may repeatedly poll for previously sent PDU within a period of time generating unnecessary overhead
Solution Approach 1:
The patent applies feedback by using the state report mechanism to inform the RLC layer about which AMD PDUs have been successfully received. When the RLC layer receives a state report containing the SN of an AMD PDU that was previously delivered to MAC layer, it uses this feedback to stop the detection retransmission timer and cease further polling for that SN. This feedback loop eliminates the repeated polling overhead while maintaining the efficiency benefits of pre-processing.
Data Source
AI summary
A method and device for retransmission processing are provided. The method includes that: a transmission side transmits a detection indication to a receiving side, the detection indication being used to indicate the receiving side to feed back a receiving state of multiple Acknowledged Mode Data (AMD) Protocol Data Units (PDU) sent by the transmission side; the transmission side receives a state report sent by the receiving side, the state report being used to indicate a receiving state of at least one AMD PDU in the multiple AMD PDUs; and if a Sequence Number (SN) of a first AMD PDU of the at least one AMD PDU is equal to a first value, the transmission side stops transmitting the detection indication for the multiple AMD PDUs to the receiving side, the first value being less than or equal to a maximum SN in the SNs of the multiple AMD PDUs. The method and device of the embodiments of the present application are advantageous in reducing unnecessary overhead.