RLC Entity PDU Gap Detection for 5G Packet Recovery
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Solution Overview
Problem
In 5G networks, there is a challenge in providing a reliable Radio Link Control (RLC) status report based on a Packet Data Convergence Protocol (PDCP) configuration, particularly in managing packet reordering and recovery of missed packets in wireless network systems.
Innovation Solution
A method and system that detect a PDU gap using sequence numbers and a t-reordering timer to generate RLC status reports, sending ACK or NAK messages based on packet receipt within twice the t-reordering time, allowing for packet recovery or discard, and adjusting the RLC window accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RLC entity waits for packet arrival before sending status report, then packet recovery reliability is improved, but transmission delay increases
Solution Approach 1:
The RLC entity performs preliminary actions by detecting PDU gaps and initiating status report transmission proactively. When a PDU gap is detected, the RLC entity sends a status report indicating missing PDUs without waiting for the upper layer to request retransmission, thereby reducing transmission delay while maintaining recovery reliability
Solution Approach 2:
The invention implements feedback mechanisms where the RLC entity continuously monitors packet reception status, detects gaps using sequence numbers, and sends status reports with NACK messages for missing PDUs. This feedback loop enables the transmitter to retransmit missing packets promptly, improving both reliability and timing
2Reliability
If the RLC entity sends status report frequently to ensure packet recovery, then packet recovery reliability is improved, but signaling overhead increases
Solution Approach 1:
The invention extracts and reports only the essential information - specifically the status of missing PDUs identified through gap detection. Rather than reporting all received and missing PDUs, the status report focuses only on NACK messages for detected gaps, reducing signaling overhead while maintaining recovery reliability
Solution Approach 2:
The RLC entity performs partial status reporting by sending NACK messages only for specifically detected missing PDUs rather than comprehensive status reports. This selective reporting approach reduces signaling overhead while ensuring critical missing packets are recovered
3Manufacturing precision
If the RLC entity waits for upper layer indication before discarding packets, then packet delivery accuracy is improved, but buffer occupancy increases
Solution Approach 1:
The RLC entity performs preliminary discarding actions by detecting PDU gaps and determining that missing PDUs will not arrive within expected timeframes. The entity proactively discards stale packets from the buffer after gap detection and timeout, preventing buffer overflow while maintaining delivery accuracy through selective discarding of only those packets confirmed to be lost
Data Source
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AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The embodiments herein provide a for providing a RLC status report based on a configuration of a PDCP entity of a UE in a wireless network system.