IAB CU-UP Local Processing for Low-Latency Data Transmission
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Solution Overview
Problem
In integrated access and backhaul (IAB) networks, service data transmission to and from UE through IAB nodes and core networks results in significant delays, failing to meet the requirements of low-latency services.
Innovation Solution
Implementing a local data network deployment by integrating a CU-UP within the IAB node, allowing service data to be processed locally, thereby reducing transmission delays by offloading data through a locally connected IAB CU-UP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If service data is transmitted through IAB nodes and core networks, then data transmission can be achieved, but transmission delay increases significantly
Solution Approach 1:
The network is segmented into multiple IAB nodes (IAB donor, IAB node 1, IAB node 2) with distributed CU-UP units. Each CU-UP can independently process data locally, breaking the single centralized processing path into multiple parallel paths, thereby reducing transmission delay while maintaining manageable complexity through modular architecture
Solution Approach 2:
The patent introduces a new dimension of local data processing by deploying CU-UP units at distributed IAB nodes rather than relying solely on centralized core network processing. This dimensional shift from centralized to distributed processing enables local breakout of data traffic, significantly reducing transmission delay
2Reliability
If data is processed through the core network, then comprehensive service processing is achieved, but low-latency service requirements cannot be met
Solution Approach 1:
Different IAB nodes are equipped with CU-UP units that can locally process data according to their specific needs. The IAB donor CU-UP, IAB node 1 CU-UP, and IAB node 2 CU-UP each have the capability to process data locally, providing localized quality of service that meets low-latency requirements while maintaining overall network reliability
Solution Approach 2:
The CU-UP units act as intermediaries between the IAB nodes and the core network. They can handle data processing locally when low latency is required, while still maintaining connectivity to the core network for comprehensive service processing, thus mediating between local speed requirements and centralized reliability
Data Source
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AI summary
This application discloses a data transmission method and apparatus, to process a service through a locally deployed data network, thereby reducing a service delay and meet a requirement of a low-delay service. The method is applied to a first integrated access and backhaul IAB donor, and includes: receiving a first message from a core network element, where the first message carries an identifier of a first protocol data unit PDU session and a first data network name DNN associated with the identifier of the first PDU session, and the first DNN indicates a local data network corresponding to a first IAB node; the first IAB node includes a first IAB central unit-user plane CU-UP, a first IAB-distributed unit DU, and a first IAB-mobile terminal MT; and the first IAB CU-UP is connected to the local data network; and notifying the first IAB CU-UP to establish the first PDU session.