Carrier Aggregation Across Digital Units in Mobile Systems
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Solution Overview
Problem
Current mobile communication systems are limited in radio capacity optimization and cannot perform carrier aggregation between radio units connected to different digital units and using different frequencies, restricting the expansion of carrier aggregation capabilities.
Innovation Solution
A mobile communication system is developed that includes multiple digital units connected to a core system, with a blade server performing resource allocation and radio units physically separated from the digital units, allowing carrier aggregation between radio units connected to different digital units using different frequencies through specific protocols like RRC, PDCP, PHY, MAC, and RLC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radio units are remotely separated from digital units to form independent RUs, then flexibility in cell design is improved, but carrier aggregation capability is limited to RUs connected to the same DU
Solution Approach 1:
A centralized controller is introduced as an intermediary component that coordinates between multiple digital units and radio units. The controller enables carrier aggregation across RUs connected to different DUs by managing resource allocation and signal processing coordination, thus resolving the limitation without compromising the remote separation architecture.
Solution Approach 2:
The system architecture is designed to support multiple carrier aggregation scenarios simultaneously - both within the same DU and across different DUs. The controller provides universal management capabilities that adapt to various deployment configurations, making the system versatile while maintaining enhanced CA functionality.
2Device complexity
If all processing units are installed in a single base station, then system integration is simplified, but radio capacity optimization is limited
Solution Approach 1:
The base station processing units are segmented into distributed digital units that can be independently deployed. This segmentation enables flexible resource allocation across multiple cells while maintaining manageable system complexity through modular architecture, thereby improving radio capacity optimization capabilities.
Solution Approach 2:
The system transitions from a single-base-station vertical integration to a multi-dimensional distributed architecture where digital units and radio units can be independently positioned and scaled. This dimensional change allows for optimized resource allocation across geographic spaces while maintaining integration through the centralized controller.
3Productivity
If carrier aggregation is implemented between RUs using different frequencies, then data transmission capacity is improved, but system complexity increases
Solution Approach 1:
The centralized controller serves as a mediator that manages the complexity of multi-frequency carrier aggregation by providing unified resource allocation and coordination. This intermediary approach enables high data transmission capacity across different frequencies while keeping individual node complexity manageable through centralized intelligence.
Data Source
AI summary
A mobile communication system for providing carrier aggregation between digital units, and a method for processing a signal in the system are provided.The mobile communication system includes: a plurality of digital units connected to a core system and configured to process a radio digital signal; a blade server connected to at least two or more digital units and configured to perform resource allocation on signals processed by the connected digital units; and a plurality of radio units physically separated from the digital units, configured to convert and amplify digital signals received from the digital units, and transmit the same to a terminal, and configured to receive a signal transmitted from the terminal and transmit the received signal to the digital units. In the system, a mobile communication service is provided to the terminal by using carrier aggregation between radio units respectively connected to at least two or more digital units and using different frequencies.