PDCP Split Bearer Handling During Secondary Cell Group Deactivation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently handling packet data convergence protocol (PDCP) operations during secondary cell group (SCG) deactivation, leading to inefficiencies and potential data loss or disruption in LTE and NR networks.
Innovation Solution
Implementing mechanisms at both the user equipment (UE) and base station to manage PDCP entities and split radio bearers in response to SCG deactivation commands, ensuring seamless data handling and minimizing disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If SCG deactivation is implemented to improve network resource efficiency, then energy consumption and resource usage are optimized, but data transmission reliability and continuity are compromised
Solution Approach 1:
The patent applies preliminary action by flushing PDCP data buffers and initiating data redirection to alternative paths (MCG for SCG bearers, SCG for MCG bearers) before the SCG deactivation takes full effect. This ensures that data transmission continuity is maintained by proactively preparing alternative transmission paths, thus resolving the contradiction between resource efficiency and transmission reliability.
2Reliability
If PDCP entities are managed during SCG deactivation to prevent data loss, then data transmission reliability is improved, but system complexity and processing overhead increase
Solution Approach 1:
The patent applies discarding and recovering by flushing PDCP data buffers to discard potentially lost data, then recovering data transmission through redirection mechanisms where MCG takes over SCG bearer transmissions and SCG takes over MCG bearer transmissions. This systematic approach manages complexity by establishing clear data handling protocols while maintaining reliability.
Solution Approach 2:
The patent uses the PDCP entity as an intermediary that coordinates data redirection between MCG and SCG during deactivation. The PDCP layer acts as a mediator that manages the transition of data paths, simplifying the overall system complexity by centralizing the coordination logic at the PDCP layer rather than distributing it across multiple layers.
3Reliability
If data redirection is implemented during SCG deactivation to maintain continuity, then data transmission reliability is improved, but processing time and operational overhead increase
Solution Approach 1:
The patent implements preliminary action by flushing PDCP buffers and establishing alternative data paths before SCG deactivation is complete. This proactive approach minimizes processing time during the actual deactivation by having redirection mechanisms already in place, thus reducing the time loss while maintaining continuity.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, a secondary cell group (SCG) deactivation command indicating that an SCG associated with the UE is deactivated. The UE may perform an action associated with a packet data convergence protocol (PDCP) entity and a split radio bearer associated with the SCG based at least in part on receiving the SCG deactivation command. Numerous other aspects are described.