PDU Set Information Forwarding During Handover
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in maintaining reliable PDU Set communication during handover events, leading to potential data loss and disruptions in services like extended reality (XR) applications due to the lack of efficient PDU Set state information transfer between source and target cells.
Innovation Solution
The method involves the transfer of PDU Set information and buffered data from the source cell to the target cell during handover, enabling the target cell to maintain PDU Set state and continue communication seamlessly, using mechanisms like Xn handover requests or NG AP handover messages to ensure uninterrupted service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If handover is performed without PDU Set information transfer, then handover speed is improved, but PDU Set communication reliability deteriorates
Solution Approach 1:
The source base station performs preliminary actions by collecting and forwarding PDU Set information (including PDU Set ID, first PDU sequence number, and second PDU sequence number) to the target base station before the handover is completed. This ensures that the target base station already has the necessary information to maintain PDU Set communication reliability when the handover occurs.
2Loss of substance
If PDU Set information is transferred during handover, then data loss is reduced, but handover complexity increases
Solution Approach 1:
The patent extracts only the essential PDU Set information (PDU Set ID, first PDU sequence number, and second PDU sequence number) from the complete PDU Set data structure and transfers only this extracted information to the target base station. This selective extraction reduces the amount of data transferred and simplifies the handover process while still preventing data loss.
Solution Approach 2:
The source base station acts as an intermediary by collecting PDU Set information from the network side and forwarding it to the target base station through the handover message. This intermediary role simplifies the overall handover complexity by centralizing the information transfer task at the source base station rather than requiring direct coordination between multiple network elements.
3Duration of action of stationary object
If buffered data is forwarded to target cell, then service continuity is improved, but signaling overhead increases
Solution Approach 1:
The patent applies local quality by providing detailed PDU Set information (including specific sequence numbers) only for the particular PDU Sets that are in transition during handover, rather than transferring information for all PDU Sets. This localized approach ensures service continuity for affected PDU Sets while minimizing the overall signaling overhead.
Data Source
AI summary
A target cell receives a handover message originating from a source cell for a user equipment (UE) and receives buffered data for one or more protocol data unit (PDU) Sets in transition between the source cell and the UE. The target cell receives PDU Set information for the one or more PDU Sets and communicates with the UE based on the PDU Set information for the one or more PDU Sets. A source cell sends or receives a portion of a PDU Set with a UE. The apparatus initiates a handover of the UE to a target cell, provides buffered data for the PDU Set to the target cell, and provides PDU Set information for the PDU Set to the target cell.