Controller-Managed Aggregator Nodes for Cellular Coverage Extension
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Solution Overview
Problem
Cellular networks face challenges in efficiently managing capacity and coverage, particularly at cell edges, where interference and resource allocation issues arise due to varying user activity and mobility, leading to suboptimal performance and potential call drops.
Innovation Solution
A controller entity facilitates the initialization of an aggregator functionality in communication devices, which involves obtaining measurement information, determining aggregator parameters such as Physical layer Cell Identity (PCI), and transmitting these parameters to enable the device to provide radio coverage, thereby managing network resources dynamically and extending coverage without requiring additional equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If additional base station equipment is deployed to extend coverage, then coverage area is improved, but network cost and device complexity increase
Solution Approach 1:
The patent enables communication devices to perform dual functions: acting as regular user equipment and as aggregator nodes providing base station functionality. This allows existing devices to extend coverage without requiring additional dedicated base station equipment, directly resolving the contradiction between coverage area and device complexity
Solution Approach 2:
The system allows communication devices to autonomously initialize and operate as aggregators by obtaining configuration parameters from the controller and self-organizing to provide coverage extension. This eliminates the need for manual deployment and configuration of additional base stations, reducing both complexity and cost while extending coverage
2Reliability
If more network resources are allocated to cell edge users, then coverage quality is improved, but network capacity and resource availability deteriorate
Solution Approach 1:
The patent divides the network into multiple aggregator nodes distributed across the coverage area. Each aggregator serves a localized group of users, segmenting the resource allocation problem. This allows resources to be distributed efficiently across multiple points rather than concentrating all resources at the cell edge, improving coverage quality while preserving overall network capacity
Solution Approach 2:
The system introduces a hierarchical dimension to resource allocation by creating multiple aggregation layers. Users can be served directly by the base station or indirectly through aggregator nodes, adding a spatial dimension to resource distribution. This enables better resource utilization by serving cell edge users through nearby aggregators rather than requiring direct high-power transmission from the central base station
3Ease of operation
If handover procedures are simplified for mobility, then user mobility is improved, but call drop rate increases
Solution Approach 1:
The system performs preliminary configuration of aggregator nodes before users need to hand over. Aggregators are pre-initialized with necessary parameters and integrated into the network in advance, so when mobility handover is required, the target aggregator is already ready to accept the connection, preventing call drops while maintaining simple handover procedures
Solution Approach 2:
The controller entity acts as an intermediary that coordinates handover procedures between users and aggregators. It manages the selection, configuration, and activation of appropriate aggregators based on user location and network conditions, ensuring seamless handovers without increasing complexity at the user device level
4Reliability
If aggregator functionality is initialized with centralized control, then network coordination is improved, but initialization time and controller load increase
Solution Approach 1:
The controller performs preliminary selection and configuration of aggregators in advance, determining which devices will serve as aggregators and pre-calculating their parameters. This preliminary action reduces the coordination overhead during actual operation, allowing fast activation when users need service while maintaining centralized control for reliability
Solution Approach 2:
The system implements dynamic aggregator initialization where the controller adapts its coordination level based on network conditions. In normal conditions, aggregators operate with pre-configured parameters requiring minimal coordination. When network conditions change or new aggregators are needed, the controller dynamically adjusts coordination intensity, balancing initialization time and coordination reliability
Data Source
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AI summary
A cellular telecommunications network architecture is described where certain UEs are configured to assist the network to improve coverage in regions of poor radio conditions. These UEs provide an opportunistic, temporary cell in addition to wireless wide area communications provided by a macrolayer cellular telecommunications infrastructure. In order that the temporary cells of these UEs are compatible with the macrolayer cellular telecommunications infrastructure, they are initially configured by a controller with values for parameters that are variously fixed for all such UEs; assigned from reserved pools of parameter values; and determined in accordance with UE measurements and reports.