Packet Duplication DRB Configuration for URLLC Reliability
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Solution Overview
Problem
In multi-connection and carrier aggregation scenarios, there is a need for a method to enable a base station to configure a packet duplication data radio bearer (DRB) for user equipment (UE) and for the UE to calculate and report transmittable data of a packet data convergence protocol (PDCP) entity, particularly in supporting packet duplication functions.
Innovation Solution
A method executed by user equipment (UE) and a base station, involving the reception and transmission of radio resource control (RRC) signaling with configuration information to establish a data radio bearer (DRB) supporting packet duplication, including configuring PDCP, RLC, and logical channels, and calculating and reporting transmittable data of the PDCP entity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If packet duplication function is supported in multi-connection and carrier aggregation scenarios, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the data transmission path by introducing multiple logical channels (first logical channel and second logical channel) that are independently configured and managed. Each logical channel can be separately activated or deactivated, allowing the system to divide the complex packet duplication function into manageable segments that can be controlled independently, thus reducing overall device complexity while maintaining reliability.
Solution Approach 2:
The patent implements dynamic configuration of packet duplication by allowing the network to activate or deactivate the packet duplication function through RRC signaling based on channel conditions and traffic requirements. This dynamic approach enables the system to adapt the complexity level according to actual needs, maintaining high reliability when necessary while reducing complexity when packet duplication is not required.
2Reliability
If packet duplication DRB is configured for UE, then data transmission reliability is improved, but buffer status reporting complexity increases
Solution Approach 1:
The patent segments the buffer status reporting by introducing separate buffer status indicators for the first logical channel and the second logical channel. Instead of managing a single complex buffer status for packet duplication DRB, the system divides the reporting into separate segments corresponding to each logical channel, making the buffer status management more manageable and less complex.
Solution Approach 2:
The patent introduces an intermediary mechanism where the MAC layer entities separately manage buffer status for each logical channel before aggregating or reporting to the network. This intermediary approach simplifies the overall buffer status reporting complexity by breaking down the complex packet duplication buffer management into separate, independently manageable components.
3Reliability
If multiple logical channels are configured for packet duplication, then transmission reliability is improved, but configuration complexity increases
Solution Approach 1:
The patent applies universality by designing the logical channel configuration to support both packet duplication and non-packet duplication scenarios using the same basic configuration framework. The first logical channel and second logical channel can be configured with similar parameters and structures, allowing the system to use a universal configuration approach that works for both packet duplication and regular transmission, thereby reducing configuration complexity.
Solution Approach 2:
The patent manages configuration complexity by dynamically changing parameters such as activating or deactivating the packet duplication function through RRC signaling. Instead of permanently configuring complex multi-channel settings, the system can adjust parameters like packet duplication activation status based on current transmission requirements, simplifying the configuration management while maintaining transmission reliability when needed.
Data Source
AI summary
The present application provides a method executed by user equipment (UE), comprising: receiving radio resource control (RRC) signaling, the RRC signaling comprising configuration information used for configuring, for the UE, a data radio bearer (DRB) supporting packet duplication; establishing a corresponding DRB according to the configuration information; and calculating transmittable data of a packet data convergence protocol (PDCP) entity for a logical channel corresponding to the established DRB. The present application also provides corresponding UE, a base station, and a corresponding method executed by a base station.