PDCP Duplication Deactivation via MAC CE Signaling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G NR IIoT, there is a challenge in managing PDCP duplication deactivation, particularly in determining how a PDCP entity should transmit PDCP PDUs after PDCP duplication is deactivated, especially when multiple RLC entities are configured but only some are activated, and ensuring efficient data transmission in carrier aggregation and dual connectivity scenarios.
Innovation Solution
A method in user equipment and base station where a MAC control element (MAC CE) is used to deactivate PDCP duplication, with primary path indication information received from the base station guiding the transmission of PDCP PDUs to either a primary path or activated RLC entities, and data splitting methods employed based on the number of activated RLC entities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple RLC entities are configured for PDCP duplication, then the reliability of data transmission is improved, but the device complexity increases
Solution Approach 1:
The patent implements dynamic activation and deactivation of RLC entities through MAC CE signaling. The base station can dynamically control which RLC entities are active for data transmission, allowing the system to adapt between using multiple RLC entities for high reliability and using fewer entities to reduce complexity based on current transmission requirements
Solution Approach 2:
The patent segments the data transmission path by configuring multiple RLC entities that can be independently activated or deactivated. This segmentation allows selective activation of specific RLC entities based on channel conditions and reliability requirements, managing complexity by not keeping all entities active simultaneously
2Reliability
If PDCP duplication is activated, then the reliability of data transmission is improved, but the loss of energy increases due to unnecessary duplicate transmissions
Solution Approach 1:
The patent employs dynamic control of PDCP duplication through MAC CE signaling, allowing the base station to activate or deactivate duplication based on current channel conditions and reliability requirements. This prevents continuous duplicate transmissions when reliability is already sufficient, thereby reducing energy consumption
Solution Approach 2:
The system changes the operational parameters of PDCP duplication dynamically. When channel conditions are good, the system can reduce or deactivate duplication to save energy. When conditions deteriorate, duplication is activated to maintain reliability, thus optimizing the trade-off between reliability and energy consumption
3Productivity
If PDCP duplication is deactivated, then the resource utilization is improved, but the difficulty of detecting and measuring the transmission path increases
Solution Approach 1:
The patent configures primary path indication information in advance through RRC signaling before PDCP duplication is deactivated. This preliminary configuration ensures that when duplication is deactivated, the UE already knows which path to use for transmission, eliminating ambiguity and making path detection straightforward
Solution Approach 2:
The patent introduces MAC CE signaling as an intermediary mechanism that clearly indicates the activation or deactivation state of PDCP duplication and identifies the active transmission paths. This intermediary signaling resolves the ambiguity that would otherwise exist when switching between duplicated and non-duplicated transmission modes
Data Source
AI summary
Provided in the present invention are user equipment and a method thereof, and a base station and a method thereof. The method in user equipment comprises: receiving, from a base station, a MAC control element (MAC CE) for deactivating a packet data convergence protocol (PDCP) duplication; and deactivating the PDCP duplication based on the received MAC CE.