PSCell Access Signaling for Faster Data Forwarding Handover

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Solution Overview

Problem

The challenge in existing wireless communication systems is the inefficiency in data forwarding between the master node (MN) and the secondary node (SN) during the addition or change of a conditional primary secondary cell (PSCell) due to the MN's inability to quickly determine the target PSCell, leading to delayed data transmission and disrupted service continuity.

Innovation Solution

A method where a terminal device transmits first indication information to the master node, providing details about the target PSCell, allowing the MN to promptly identify and forward data to the SN, thereby enhancing service continuity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the terminal device waits for the network to provide target PSCell information, then the network can control the handover process, but the data forwarding is delayed and service continuity is disrupted

Engineering Contradiction:

Improveservice continuityVSAvoiddata forwarding delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The terminal device performs preliminary action by proactively transmitting first indication information containing target PSCell information to the master node before the actual handover execution. This allows the master node to prepare data forwarding paths in advance, eliminating the delay where the network would wait for terminal feedback about the target cell.

Inventive Principle:

Principle #10Preliminary action

2Speed

If the terminal device proactively provides target PSCell information, then data forwarding speed is improved, but the terminal device needs to make decisions about target cell selection

Engineering Contradiction:

Improvedata forwarding speedVSAvoidterminal device decision logic

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The terminal device transmits first indication information as feedback to the master node about the target PSCell it has identified. This feedback mechanism allows the terminal to share its cell selection decisions with the network, enabling the master node to immediately initiate data forwarding to the correct secondary node without delay.

Inventive Principle:

Principle #23Feedback

3Reliability

If the master node waits to determine target PSCell, then the network can optimize handover timing, but service continuity is disrupted due to delayed data transmission

Engineering Contradiction:

Improveservice continuityVSAvoiddata forwarding efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The terminal device transmits target PSCell information to the master node in advance, allowing the master node to perform preliminary data forwarding preparation. This eliminates the traditional approach where the network waits for terminal readiness before initiating data transfer, thereby improving both service continuity and data forwarding efficiency simultaneously.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12507138B2Cell accessing method, electronic device, and storage medium

Publication Date: 2025.12.23 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

Disclosed is a cell accessing method, comprising: a terminal device transmits first indication information to a primary node, the first indication information being used for indicating information of target primary and secondary cells to be accessed by the terminal device. Also disclosed are another cell accessing method, an electronic device, and a storage medium.