PDU Session Handover via Dual-Path Establishment

Solution Overview

Problem

Cross-base station handovers in wireless communication networks cause temporary interruptions in data transmission due to the need to disconnect old sessions before establishing new ones, leading to delays and interruptions on the air interface.

Innovation Solution

Implementing a first type transmission and handover process on PDU sessions, where data packets are copied through multiple paths and prioritized with specific QoS parameters, and establishing paths with both base stations before handover, allowing uninterrupted air interface handovers in single-pass or dual-pass modes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional handover process is used, then session establishment is simplified, but data transmission interruption increases

Engineering Contradiction:

Improvedata transmission continuityVSAvoidhandover interruption time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by establishing the new session at the target base station before the actual handover occurs. The core network element establishes a second path to the target base station in advance, so that when handover is needed, the new session is already ready and data transmission can continue without interruption. This resolves the contradiction by preparing the new session beforehand, eliminating the need to wait for session establishment during the handover process.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent segments the handover process into distinct phases: first establishing the new session at the target base station, then executing the handover. By separating the session establishment from the handover execution, the system can perform these operations in parallel or in a coordinated manner that minimizes interruption. The segmentation allows the new session to be set up independently before the actual data transmission switches paths.

Inventive Principle:

Principle #1Segmentation

2Speed

If single-pass handover is used, then handover speed increases, but data transmission interruption increases

Engineering Contradiction:

Improvehandover speedVSAvoiddata transmission interruption time

Core Design Contradiction:

SpeedVSLoss of time

Solution Approach 1:

The patent applies preliminary action by establishing the new session at the target base station before the actual handover occurs. The core network element establishes a second path to the target base station in advance, so that when handover is needed, the new session is already ready and data transmission can continue without interruption. This resolves the contradiction by preparing the new session beforehand, eliminating the need to wait for session establishment during the handover process.

Inventive Principle:

Principle #10Preliminary action

3Ease of manufacture

If path establishment is performed during handover, then session setup is simplified, but handover delay increases

Engineering Contradiction:

Improvesession setup simplicityVSAvoidhandover delay

Core Design Contradiction:

Ease of manufactureVSLoss of time

Solution Approach 1:

The patent applies preliminary action by establishing the new session at the target base station before the actual handover occurs. The core network element establishes a second path to the target base station in advance, so that when handover is needed, the new session is already ready and data transmission can continue without interruption. This resolves the contradiction by preparing the new session beforehand, eliminating the need to wait for session establishment during the handover process.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP3761703B1Session processing method and device, computer storage medium

Publication Date: 2023.06.28 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

Figure 1
Figure 2(a)
Figure 2(b)

AI summary

Provided is a session processing method and device, computer storage medium, wherein the method comprises: performing a first type transmission and/or a first type handover process on the PDU session and/or the data stream in the PDU session, wherein the first type of transmission comprises: the network side and the terminal side perform data copy type transmission on the data packet through multiple paths, and/or perform the first priority transmission on the data packet, the first priority transmission refers to that the transmitted data stream corresponds to a set of specific QoS parameters; wherein the first type of handover process comprises: before the air interface data radio bearer is handover from the first base station to the second base station, the second core network element completes the establishment of a first path with the first base station and the establishment of a second path with the second base station; after the air interface data radio bearer is handover from the first base station to the second base station, the second core network element releases the first path with the first base station.