UE-Centric Clustering in Cell-Free Networks
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Solution Overview
Problem
Current wireless communication systems face challenges in providing uniform service quality, seamless mobility, and improved latency, throughput, and capacity, especially in cell-edge scenarios and as user equipment (UE) moves through the network.
Innovation Solution
The implementation of a cell-free wireless communication system that dynamically creates and maintains UE-centric clusters of base stations, allowing for adaptive distribution of communication functionalities and RRC connection management without the need for traditional cell boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cell-based networks are used, then network infrastructure is simplified, but service quality uniformity and mobility performance deteriorate
Solution Approach 1:
The network is segmented into multiple distributed access points instead of traditional cell structures. Each access point serves a specific geographic area or user group, enabling fine-grained control and uniform service quality across the network without requiring complex cell boundary management
Solution Approach 2:
The system dynamically forms and reconfigures clusters of access points based on user equipment movement and network conditions. This dynamic clustering allows the network to adapt to mobility requirements while maintaining simplified infrastructure, resolving the contradiction between service quality uniformity and architectural complexity
2Loss of time
If traditional handover mechanisms are used, then connection management is straightforward, but handover delays and service continuity deteriorate
Solution Approach 1:
The system performs preliminary cluster formation and resource allocation before user equipment needs to move. By pre-establishing clusters and preparing resources in advance, handover delays are minimized while connection management remains straightforward through automated cluster-based control
Solution Approach 2:
A cluster management function acts as an intermediary that handles connection management tasks. This mediator coordinates cluster formation, resource allocation, and handover decisions, reducing handover delays while maintaining operational simplicity through centralized cluster-level management
3Productivity
If cell-free clustering is implemented, then coverage uniformity and capacity improve, but system complexity and coordination overhead increase
Solution Approach 1:
The cluster management function performs multiple tasks including cluster formation, resource allocation, coordination, and handover management. This multi-functional approach improves network capacity by optimizing resource utilization across clusters while reducing overall system complexity by consolidating management functions
Solution Approach 2:
The system dynamically adjusts cluster parameters such as size, composition, and resource allocation based on network conditions and user requirements. By changing these parameters adaptively, the network achieves high capacity while managing coordination complexity through standardized parameter-based control mechanisms
Data Source
AI summary
Systems and methods for clustering in cell-free networks are described herein. A cluster of one or more base stations provides radio access network (RAN) functionality to a user equipment (UE) within the wireless communication system in a cell-free manner (e.g., without using a base-station-centric cell context, as in prior wireless communication systems). A cluster that is serving a UE comprises one or more connected base stations (cBSs) that actively serve the UE. A clustering control function (CCF) of the network establishes and maintains the cluster that is serving one or more UEs. Herein, messaging systems and messaging types used by the CCF, base station(s), and UE(s) within this cell-free context are discussed. Initial clustering methods used by a CCF to form a cluster for a UE are discussed. Further, clustering update methods used by a CCF to maintain/modify a cluster for a UE are discussed.