Front-haul Transport Network with Variable Delay Channels
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Solution Overview
Problem
Current front-haul transport networks (FTNs) face challenges in meeting low transmission delay requirements and optimizing resource utilization, leading to inefficient use of resources and increased costs for fault location and maintenance.
Innovation Solution
The implementation of an FTN comprising an access-type front-haul transport node (FTN-ACC) and an aggregation-type front-haul transport node (FTN-AGG), which establish multiple transmission channels with varying delays, allowing for selection based on data requirements, thereby optimizing resource utilization and meeting delay requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If optical fiber direct connection is used to connect each RRU and BBU pool, then transmission delay requirement is satisfied, but the number of optical fiber pairs increases and resource utilization rate decreases
Solution Approach 1:
Multiple RRUs share a common transmission channel through the FTN-ACC aggregation node, merging multiple individual connections into a shared infrastructure. This reduces the total number of optical fiber pairs required while maintaining low transmission delay through direct connection architecture.
Solution Approach 2:
The FTN-ACC serves as an intermediary aggregation node that consolidates traffic from multiple RRUs before forwarding to the BBU pool. This mediator structure enables resource sharing while preserving direct connection performance characteristics.
2Quantity of substance
If color optical fiber direct connection is used to share optical fibers among multiple RRUs, then resource utilization rate improves, but transmission delay requirement cannot be satisfied due to wavelength allocation complexity
Solution Approach 1:
The patent extracts the wavelength allocation and multiplexing complexity from the transmission path by using direct optical fiber connections without complex color code multiplexing. This simplifies the transmission architecture and reduces transmission delay while maintaining resource efficiency through aggregation.
Solution Approach 2:
The network is segmented into two functional layers: the access layer (FTN-ACC) that provides direct low-delay connections to RRUs, and the aggregation layer (FTN-AGG) that optimizes resource utilization. This segmentation allows each layer to optimize for its specific function without compromising the other.
3Device complexity
If existing transport network (OTN or PTN) is used to provide front-haul transport bearer, then device complexity is reduced, but transmission delay exceeds the required threshold due to node processing delay
Solution Approach 1:
The FTN-ACC acts as a specialized intermediary node that provides aggregation functionality with minimized processing delay, serving as a bridge between the simple direct connection architecture and the BBU pool requirements.
Solution Approach 2:
The patent changes the processing delay parameter by designing the FTN-ACC with simplified forwarding logic that bypasses complex OTN/PTN processing protocols, achieving sub-100us end-to-end delay while maintaining aggregation capabilities.
Data Source
AI summary
A front-haul transport network and a data transmission method, the front-haul transport network including: an access type front-haul transport node (FTN-ACC), used for connecting to a remote radio unit (RRU); an aggregate type front-haul transport node (FTN-AGG), one end of which is connected to the FTN-ACC and the other end of which is connected to baseband processing units (BBUs); at least two transmission channels having different transmission delays are established between the FTN-ACC and the FTN-AGG, the FTN-ACC and/or the FTN-AGG being specifically used for selecting a corresponding transmission channel for carrying out transmission according to time delay requirements for data.