PDCP SDU Reception Handling Through Delivery State Updates

Solution Overview

Problem

Current wireless communication technologies lack efficient mechanisms for handling packet data convergence protocol (PDCP) service data unit (SDU) reception, particularly in extended reality (XR) services, leading to delays and unnecessary power consumption due to non-consecutive PDCP SDU delivery.

Innovation Solution

Implementing a delivery state variable update function in user equipment (UE) and network nodes to manage PDCP SDU delivery, including configurations and indications for updating delivery state variables and reordering timers, ensuring timely and efficient delivery of PDCP SDUs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If non-consecutive PDCP SDU delivery is used, then flexibility in data transmission is improved, but latency and power consumption increase

Engineering Contradiction:

Improveflexibility in data transmissionVSAvoidlatency

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The network side performs preliminary actions by determining which PDCP SDUs have been successfully received and storing this delivery state information before the UE needs to deliver data to upper layers. This allows the UE to skip unnecessary reordering delays and directly deliver consecutive SDUs based on the pre-determined state, reducing latency while maintaining flexibility.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The network provides feedback to the UE about the delivery state of PDCP SDUs through signaling messages. This feedback mechanism allows the UE to adjust its delivery behavior accordingly, delivering data consecutively when the network confirms receipt, thereby reducing latency and power consumption while maintaining transmission flexibility when needed.

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If non-consecutive PDCP SDU delivery is used, then flexibility in data transmission is improved, but power consumption increases

Engineering Contradiction:

Improveflexibility in data transmissionVSAvoidpower consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The network side performs preliminary actions by determining which PDCP SDUs have been successfully received and storing this delivery state information before the UE needs to deliver data to upper layers. This allows the UE to skip unnecessary reordering delays and directly deliver consecutive SDUs based on the pre-determined state, reducing latency while maintaining flexibility.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The network provides feedback to the UE about the delivery state of PDCP SDUs through signaling messages. This feedback mechanism allows the UE to adjust its delivery behavior accordingly, delivering data consecutively when the network confirms receipt, thereby reducing latency and power consumption while maintaining transmission flexibility when needed.

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If traditional PDCP SDU reception handling is used, then protocol compatibility is maintained, but processing efficiency decreases

Engineering Contradiction:

Improveprotocol compatibilityVSAvoidprocessing efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent segments the PDCP SDU delivery process into two parts: (1) traditional reordering-based delivery for maintaining protocol compatibility, and (2) a new delivery state variable-based mechanism for efficient consecutive delivery. This segmentation allows the system to use the most efficient method while preserving compatibility with existing protocols.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The network side performs preliminary actions by determining which PDCP SDUs have been successfully received and storing this delivery state information before the UE needs to deliver data to upper layers. This allows the UE to skip unnecessary reordering delays and directly deliver consecutive SDUs based on the pre-determined state, reducing latency while maintaining flexibility.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250317797A1Methods and apparatuses for a PDCP SDU reception handling operation

Publication Date: 2025.10.09 LENOVO (BEIJING) LTD

AI summary

Embodiments of the subject application relate to methods and apparatuses for a packet data convergence protocol (PDCP) service data unit (SDU) reception handling operation. According to an embodiment of the subject application, a user equipment (UE) includes a processor and a transceiver coupled to the processor; and the processor is configured to: receive a configuration for enabling an update function of a delivery state variable associated with a first packet data convergence protocol (PDCP) service data unit (SDU) not delivered by a PDCP entity of a data radio bearer (DRB) to an upper layer of the UE via the transceiver from a network; and enable the update function of the delivery state variable for the PDCP entity of the DRB based on the configuration.