Transceiver Sequence Number Comparison for PDU Retransmission
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Solution Overview
Problem
In the 3GPP LTE system, the lack of reordering for RLC status PDUs leads to out-of-order reception, causing previously acknowledged PDUs to be negatively acknowledged, resulting in unnecessary retransmissions that waste radio resources and increase network interference.
Innovation Solution
A method and apparatus for a transceiver that identifies and compares sequence numbers (SNs) in received status PDU reports with previously acquired ACKed SNs to prevent retransmission of PDUs that have already been acknowledged, ensuring only unacknowledged PDUs are retransmitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If status PDU reports are not reordered, then device complexity is reduced, but reliability deteriorates due to out-of-order reception causing unnecessary retransmissions
Solution Approach 1:
The patent applies preliminary action by storing previously received status PDU reports and their associated sequence numbers before processing current reports. This allows the system to check against historical data to determine if a NACKed PDU was previously acknowledged, preventing unnecessary retransmissions while avoiding complex reordering mechanisms.
2Reliability
If all NACKed PDUs are retransmitted, then reliability is improved by ensuring delivery, but productivity deteriorates due to unnecessary retransmissions of already acknowledged data
Solution Approach 1:
The patent implements feedback by comparing sequence numbers from current and previously stored status PDU reports. When a NACKed PDU is identified, the system checks whether it was previously acknowledged by comparing its sequence number against historical ACKed PDU records. This feedback mechanism prevents redundant retransmissions of already delivered data, improving radio resource efficiency while maintaining reliable delivery.
3Ease of operation
If status PDU reports are processed in received order, then ease of operation is maintained, but loss of information occurs when older reports with NACKs for already ACKed PDUs are acted upon
Solution Approach 1:
The system performs preliminary storage of status PDU report data including sequence numbers before processing. This preliminary action enables the processing step to reference historical information and identify duplicate NACKs for already ACKed PDUs, preventing loss of information about previous acknowledgments while maintaining simple processing operations.
Data Source
AI summary
The present invention relates to a method and to a transceiver (100) of a telecommunications system capable in exchanging protocol data units (PDUs) with another transceiver(s). Each PDU being identified using a sequence number. The transceiver, according to the present invention, is arranged to receive from the other transceiver a status report indicating positively acknowledged PDUs and negatively acknowledged PDUs. The transceiver (100) is further configured to compare sequence numbers in the report with previously acquired sequence numbers from previous reports and to prevent retransmissions of one or several PDUs based on the comparison.