PDCP Duplication Control for 5G Radio Link Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the 5G communication system, managing radio links effectively during packet duplication and increasing data transmission efficiency while handling maximum retransmissions, as well as generating security keys and performing integrity checking in non-standalone structures, are challenging tasks.
Innovation Solution
The method involves performing PDCP duplication through multiple logical channels, retransmitting packets upon request, and deactivating duplication when the maximum number of retransmissions is reached, along with generating security keys and integrity checking in NSA structures using specific key derivation algorithms and integrity protection mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCP duplication is performed to transmit identical PDCP PDU through multiple logical channels, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the packet transmission by duplicating PDCP PDUs across multiple logical channels (first and second logical channels). Each channel independently transmits copies of the same data, allowing the system to divide the transmission task into separate paths. This segmentation improves reliability by providing multiple independent transmission routes while managing complexity through structured channel separation.
Solution Approach 2:
The patent applies local quality by assigning different characteristics to different logical channels. Each logical channel can have independent quality parameters, transmission priorities, and error protection levels. This allows the system to optimize each channel's performance characteristics locally while maintaining overall system reliability through duplication.
2Reliability
If the number of retransmissions is increased to ensure data delivery, then reliability is improved, but loss of time increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring the maximum number of retransmissions and establishing retransmission thresholds before actual data transmission begins. The system proactively sets up the retransmission mechanism with predetermined limits, allowing it to respond quickly during transmission without requiring complex real-time decisions about whether to retransmit.
Solution Approach 2:
The patent employs feedback mechanisms where the receiving end sends acknowledgments or negative acknowledgments to the transmitting end based on received PDCP PDUs. This feedback loop allows the system to intelligently control retransmissions - only retransmitting when necessary and stopping when the maximum retransmission count is reached, thereby balancing reliability with time efficiency.
3Reliability
If packet duplication is continuously performed to maintain transmission reliability, then reliability is improved, but use of energy increases
Solution Approach 1:
The patent implements periodic action by controlling PDCP duplication to be activated or deactivated based on transmission conditions and retransmission counters. Rather than continuously duplicating packets, the system periodically evaluates whether duplication is necessary and adjusts its operation accordingly, deactivating duplication when reliability requirements are met or when retransmission limits are reached.
Solution Approach 2:
The patent applies discarding and recovering by discarding duplicate PDCP PDUs when the maximum retransmission number is reached or when acknowledgment is received. The system recovers resources by stopping duplication operations once the transmission objective is achieved, thereby reducing unnecessary energy consumption while maintaining transmission reliability during critical phases.
Data Source
AI summary
The purpose of the present invention is to provide a method for increasing data transmission efficiency when performing packet duplication. A method for a terminal in a wireless communication system according to the present invention comprises the steps of: performing protocol data convergence protocol (PDCP) duplication in which an identical PDCP protocol data unit (PDU) is transmitted to a base station through each of a first logical channel and a second logical channel; when a request for retransmission of the PDCP PDU which has been transmitted through the second logical channel is received from the base station, retransmitting the PDCP PDU to the base station; and when the PDCP PDU has been retransmitted a predetermined number of times or more, receiving, from the base station, information indicating deactivation of the PDCP duplication.