IAB Adaptation Layer Segmentation for 5G Bearer Aggregation
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Solution Overview
Problem
Current 5G network architectures face challenges in efficiently managing bearer aggregation due to limitations in routing and channel management, particularly in densely deployed mmWave systems with sparse fiber deployment, leading to suboptimal network performance and increased complexity.
Innovation Solution
The implementation of an integrated access backhaul network architecture that splits the adaptation layer into two parts, with one layer operating above the Radio Link Control (RLC) layer for routing and the other below for bearer aggregation, allowing for flexible configuration modes to optimize data aggregation and routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single adaptation layer is used for both routing and bearer aggregation, then the network architecture is simpler, but routing efficiency and bearer aggregation performance are suboptimal
Solution Approach 1:
The adaptation layer is segmented into two separate layers: a first adaptation layer positioned above the RLC layer for routing functions, and a second adaptation layer positioned below the RLC layer for bearer aggregation functions. This segmentation allows each layer to be optimized for its specific function, improving overall routing efficiency and bearer aggregation performance while maintaining manageable complexity through clear functional separation.
2Adaptability or versatility
If bearer aggregation is performed above the RLC layer, then routing flexibility is improved, but the demand for logical channel identifiers increases
Solution Approach 1:
By segmenting the adaptation layer into two separate layers positioned at different locations relative to the RLC layer, the patent enables routing flexibility at the upper layer while using the lower layer for bearer aggregation that can operate with existing logical channel identifier structures, thus balancing adaptability with resource efficiency.
Solution Approach 2:
The patent introduces a vertical dimension to the adaptation layer architecture by placing adaptation functions at two different vertical positions (above and below RLC layer). This dimensional change allows routing operations to occur at the upper adaptation layer with full flexibility, while bearer aggregation at the lower layer can operate more efficiently with constrained identifier resources.
3Ease of manufacture
If fiber deployment is sparse in densely deployed mmWave systems, then deployment cost is reduced, but network performance and reliability deteriorate
Solution Approach 1:
The dual adaptation layer structure acts as an intermediary mechanism that enables efficient bearer aggregation and routing over wireless backhaul links. This intermediary architecture compensates for the absence of dense fiber deployment by optimizing data transmission and aggregation at the protocol layer, thereby maintaining network performance and reliability while allowing sparse physical infrastructure deployment.
Data Source
AI summary
In a 5G network, an integrated access and backhaul (IAB) deployment in a 5G network, can enable aggregation of multiple user equipment (UE) bearers into backhaul bearers based on factors such as route information of UE bearers and quality of service of UE bearers. Additionally, an adaptation layer can be configured to perform aggregation of data from UE bearers into backhaul bearers either above or below a radio link control layer. Thus, aggregation of data from UE bearers into backhaul bearers can be performed either above the RLC or below the RLC to take advantage of benefits from both options.