PDCP Discard Timer Handling for Multi-Modal Data Synchronization
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Solution Overview
Problem
Existing radio access networks struggle to maintain synchronization of multi-modal data in immersive multi-modal virtual reality applications, leading to asynchronous user experiences due to the lack of precise synchronization between different media components, which negatively impacts user perception.
Innovation Solution
Implementing a method of packet data convergence protocol (PDCP) discard management in user equipment (UE) that sets discard timers for PDCP service data units (SDUs) based on radio resource control configurations and discards SDUs if they share specific parameters, such as multi-modal service identifiers (MMSIDs), to avoid unnecessary transmissions of obsolete data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If discard timers are set for individual PDCP SDUs, then data transmission timeliness is improved, but transmission overhead increases due to separate timer management for each SDU
Solution Approach 1:
The patent merges multiple individual discard timers into a single unified discard timer that manages multiple PDCP SDUs. When the first PDCP SDU is discarded due to timer expiration, the same discard timer value is applied to the second PDCP SDU with the same parameter, eliminating the need for separate timer management while maintaining timely discard functionality.
Solution Approach 2:
The discard timer is designed with multi-functionality to serve multiple PDCP SDUs with the same parameter. A single timer instance can discard multiple SDUs by checking their parameters and applying the same discard decision, making the timer system more efficient and less complex.
2Reliability
If all PDCP SDUs are transmitted regardless of synchronization status, then data completeness is improved, but synchronization precision deteriorates due to transmission of obsolete data
Solution Approach 1:
The system performs preliminary checks on PDCP SDU parameters before transmission. By comparing parameters of multiple SDUs and identifying those with matching parameters, the system proactively determines which SDUs should be discarded to maintain synchronization, preventing obsolete data from being transmitted in the first place.
Solution Approach 2:
The patent implements a feedback mechanism where the transmission status and parameter matching results of PDCP SDUs are continuously monitored. When an SDU is discarded, this information feeds back into the system to influence the handling of subsequent SDUs with the same parameters, ensuring synchronization is maintained through iterative parameter comparison and discard decisions.
3Manufacturing precision
If parameter-based discard decision is implemented, then synchronization precision is improved, but processing complexity increases due to parameter comparison operations
Solution Approach 1:
The patent applies parameter-based discard decisions locally to specific groups of PDCP SDUs that share the same parameter. Instead of implementing a complex global analysis of all SDUs, the system performs simple parameter comparisons within local groups, making the processing more manageable and efficient while maintaining synchronization precision.
Data Source
AI summary
A method of packet data convergence protocol (PDCP) discard management and a user equipment are provided. The method includes: obtaining a plurality of PDCP service data units (SDUs), wherein the plurality of PDCP SDUs comprises a first PDCP SDU corresponding to a first parameter and a second PDCP SDU corresponding to a second parameter; setting a discard timer for the first PDCP SDU according to a radio resource control configuration received from a base station; discarding the first PDCP SDU after the discard timer has expired and determining whether the second parameter is the same as the first parameter; and in response to the second parameter being the same as the first parameter, discarding the second PDCP SDU.