Multi-PDCP Data Duplication for Seamless Wireless Handover
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems experience service interruptions during network handover due to changes in security keys, which affect data transmission efficiency when using data duplication transmission based on a single PDCP entity.
Innovation Solution
Implementing a wireless communication method that utilizes at least two PDCP entities to serve the same upper-layer data, each with its own key, enabling data duplication and redundancy detection, and coordinating through SDAP entities to manage sequence numbers and conditions for seamless handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data duplication transmission is implemented using a single PDCP entity, then data transmission reliability is improved, but service interruption occurs during network handover due to security key changes
Solution Approach 1:
The patent divides the single PDCP entity into multiple PDCP entities (first PDCP entity and second PDCP entity), each with independent security keys. This segmentation allows the system to maintain multiple independent data transmission paths, so when handover occurs and one PDCP entity needs to be reconfigured, the other can continue operating without interruption.
Solution Approach 2:
The patent changes the security key parameter by assigning different security keys to different PDCP entities. During handover, only the security key of the affected PDCP entity needs to be changed, while the other PDCP entity maintains its original key and continues transmission, thus avoiding complete service interruption.
2Loss of time
If multiple PDCP entities are used to avoid service interruption during handover, then data transmission continuity is improved, but system complexity increases
Solution Approach 1:
The patent creates a copy of the PDCP entity structure (first PDCP entity and second PDCP entity) where the second entity serves as a standby or parallel transmission path. This copying approach allows seamless switching during handover while maintaining a relatively simple and symmetric structure that is easier to manage than completely asymmetric configurations.
Solution Approach 2:
The patent designs the multiple PDCP entities to be universally applicable for both normal data transmission and handover scenarios. Each PDCP entity can independently perform encryption, decryption, and data transmission functions, making the system more versatile and easier to manage during different operational states.
3Ease of operation
If each PDCP entity uses a separate security key, then handover smoothness is improved, but key management complexity increases
Solution Approach 1:
The patent performs preliminary configuration of multiple PDCP entities with their respective security keys before handover occurs. This advance preparation ensures that when handover is needed, the system can immediately switch to the pre-configured PDCP entity with the appropriate key, avoiding the need for complex real-time key generation and management during the critical handover moment.
Data Source
AI summary
A wireless communication method, applied to a communication device including at least two packet data convergence protocol (PDCP) entities, the at least two PDCP entities are used for serving identical upper layer data and the method includes: the communication device receives and/or transmits data by means of the at least two PDCP entities.