PDCP Version Change Data Transmission in Wireless Systems
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Solution Overview
Problem
Data loss or redundancy occurs when changing the packet data convergence protocol (PDCP) version in wireless communication systems, particularly during inter-system network structures like 4G to 5G transitions, due to the necessity of data radio bearer release and addition procedures.
Innovation Solution
The method involves configuring various data transmission modes in base stations to prevent data loss by resequencing and retransmitting data packets, using acknowledged and unacknowledged modes, and employing sequence number management to ensure data delivery without duplication or loss during PDCP version changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PDCP version is changed through data radio bearer release and addition procedure, then PDCP version compatibility is improved, but data loss occurs during the procedure
Solution Approach 1:
The source base station performs preliminary actions by determining which data packets have been successfully received by the terminal before PDCP version change. This includes identifying transmitted packets and receiving acknowledgments, then preparing transfer information for packets that need to be retransmitted by the target base station, preventing data loss during the version transition.
Solution Approach 2:
The source base station acts as an intermediary by generating and transmitting transfer information about data packets to the target base station. This intermediary action ensures that the target base station has the necessary information to retransmit packets that were not successfully received, bridging the gap between source and terminal during the PDCP version change.
2Adaptability or versatility
If data radio bearer release and addition procedure is performed, then PDCP version change is achieved, but transmission interruption occurs
Solution Approach 1:
The invention maintains continuity of useful action by ensuring that data transmission continues without interruption during PDCP version change. The target base station uses transfer information from the source base station to immediately retransmit necessary packets, eliminating gaps in data transmission that would otherwise occur during the bearer release and addition procedure.
3Adaptability or versatility
If PDCP version is changed in inter system network structure, then network evolution is enabled, but data redundancy occurs
Solution Approach 1:
The invention uses feedback mechanisms where the source base station receives acknowledgment information from the terminal about which data packets were successfully received. This feedback allows the source base station to accurately determine which packets need to be transferred to the target base station for retransmission, preventing both data loss and unnecessary data redundancy during PDCP version change.
Data Source
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AI summary
The present disclosure relates to a communication technique for converging a 5G communication system for supporting a higher data transfer rate beyond a 4G system with an loT technology, and a system therefor. The present disclosure may be applied to intelligent services (for example, smart home, smart buildings, smart cities, smart cars or connected cars, health care, digital educations, retail business, security and safety-related services, etc.) on the basis of a 5G communication technology and an IoT-related technology. A method for transmitting data by a first communication device in the case of a packet data convergence protocol (PDCP) version change in a wireless communication system according to an embodiment of the present invention comprises the steps of: checking whether the PDCP version of a first PDCP entity for the first communication device is changed from the PDCP version of a second PDCP entity for a second communication device; when the PDCP version of the first PDCP entity is changed, identifying first data transmitted by the second PDCP entity to a radio link control (RLC) entity for the second communication device; and transmitting second data to a third communication device on the basis of the first data and a data transmission mode configured for the first communication device.