Layer 2 Split Assembly for Cell-Free Uplink Coordination
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Solution Overview
Problem
Traditional cell-based wireless communication systems face limitations in capacity, coverage inconsistencies, scalability, and increased latency, especially in densely populated urban areas, leading to congestion and reduced service quality.
Innovation Solution
Implementing a cell-free architecture with distributed transmission and reception points (TRPs) communicatively coupled to edge nodes, which are connected to a central processing unit, allowing for a more uniform signal distribution and reduced latency by bringing users closer to network access points, and splitting L2 functionalities between distributed units and a central unit to optimize communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a traditional cell-based wireless communication system is used, then the network structure is simple and easy to implement, but the network capacity is limited and coverage inconsistencies occur in densely populated areas
Solution Approach 1:
The patent segments the traditional monolithic base station into multiple distributed access points (APs) that are geographically dispersed. Each AP serves a specific local area, and multiple APs cooperate to serve a single user equipment (UE). This segmentation enables the network to handle higher capacity demands in densely populated areas while maintaining uniform coverage, as the load is distributed across multiple APs rather than concentrated in a single cell.
2Productivity
If more base stations are deployed to increase network capacity, then the network capacity improves, but the latency increases due to more hops in signal transmission
Solution Approach 1:
The patent introduces a new architectural dimension by distributing access points across multiple geographic locations rather than concentrating them in fixed cell centers. This spatial distribution allows users to connect to the nearest AP, reducing the number of signal hops and transmission latency while simultaneously increasing network capacity through parallel processing at multiple APs.
3Reliability
If a cell-free architecture with distributed access points is implemented, then the signal distribution becomes uniform and latency is reduced, but the device complexity and coordination requirements increase
Solution Approach 1:
The patent merges the functionality of multiple distributed access points into a unified virtual base station through centralized coordination. The centralized unit (CU) consolidates control functions, resource allocation, and signal processing across all distributed units (DUs), simplifying the coordination complexity while maintaining the benefits of distributed architecture for uniform signal distribution and reduced latency.
4Ease of operation
If traditional cellular architecture is used, then the network architecture is centralized and easy to manage, but the mobility support and seamless handover become challenging in high-speed scenarios
Solution Approach 1:
The patent implements a dynamic architecture where the set of active access points serving a user equipment changes continuously based on user mobility and channel conditions. Unlike traditional static cell boundaries, the cell-free architecture dynamically adjusts which APs serve which users, enabling seamless mobility support in high-speed scenarios while maintaining simplified network management through centralized control.
Data Source
AI summary
Embodiments herein provide methods, systems, and apparatuses for layer 2 (L2) functionality split for a cell-free architecture. In some embodiments a central unit may receive segments of an uplink packet data unit (PDU) via multiple edge L2 nodes. The segments may be sent by a user equipment (UE). The central unit may perform assembly of the segments of the uplink PDU from the multiple edge L2 nodes. Upon successful assembly, the central unit may send the multiple edge L2 nodes an assembly success report to inform MAC schedulers at the multiple edge L2 nodes about the successful assembly.