Transport Layer Address Update in Split Radio Network Architecture
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Solution Overview
Problem
The existing split radio network architecture faces challenges in efficiently reconfiguring transport layer tunnel endpoints during integrated access backhaul topology adaptation, leading to inefficient air interface resource utilization and potential service interruptions due to the need for multiple messages to update each transport layer tunnel or user plane bearer.
Innovation Solution
A method is introduced where a single message updates multiple transport layer addresses by indicating both the old and new transport layer addresses, allowing the central unit to update all associated tunnels or bearers simultaneously, thereby relocating multiple endpoints efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple messages are sent to update each transport layer tunnel or user plane bearer individually, then the transport layer address update is complete and accurate, but the signalling overhead increases and the handover process is delayed
Solution Approach 1:
The patent combines multiple individual address update messages into a single aggregated update message that contains transport layer address information for multiple tunnels or bearers. This merging approach reduces the number of separate signalling transactions while ensuring all necessary address updates are delivered reliably to the migrating IAB node, thereby reducing handover delay without compromising update completeness.
Solution Approach 2:
The update message is designed to serve multiple functions simultaneously: it updates transport layer addresses for multiple tunnels, notifies the migrating IAB node of the address changes, and enables the donor CU to efficiently reconfigure the transport network. This multi-functional message structure reduces overall signalling overhead while maintaining reliable address propagation across the IAB topology.
2Reliability
If multiple messages are sent to update each transport layer tunnel or user plane bearer, then the address update is reliable, but the air interface resource utilization becomes inefficient
Solution Approach 1:
The patent merges multiple address update operations into a single consolidated message transmitted over the air interface. This reduces the number of separate radio resource allocations and transmissions required, thereby improving air interface resource utilization efficiency while maintaining reliable delivery of all address update information through the unified message structure.
3Ease of operation
If individual messages are used for each transport layer tunnel update, then the update process is simple and straightforward, but the signalling overhead increases significantly
Solution Approach 1:
The patent combines multiple individual update messages into a single aggregated message that efficiently carries transport layer address information for multiple tunnels or bearers. This merging reduces the total quantity of signalling messages and data transmitted, thereby reducing signalling overhead while maintaining operational simplicity through a unified update mechanism that the donor CU can process in a single operation.
Data Source
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AI summary
A radio network equipment central unit (20, 1700) receives a message (15) that indicates an update to a transport layer address of a radio network equipment distributed unit (10, 1600) from an old transport layer address (12A) to a new transport layer address (12B). The message (15) indicates the old transport layer address (12A) and indicates the new transport layer address (12B). The message (15) may be received from the radio network equipment distributed unit (10, 1600), or from a distributed unit of an integrated access backhaul donor. Regardless, for each of multiple user plane bearers or transport layer tunnels that are associated with the old transport layer address (12A), the radio network equipment central unit (20, 1700) may update a transport layer address of that bearer or tunnel from the old transport layer address (12A) to the new transport layer address (12B).