Virtual UE Scheme for Distributed Antenna Data Retransmission
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Solution Overview
Problem
Current wireless communication systems face challenges in providing high throughput and stable links for vehicles with high mobility, especially due to aesthetic and aerodynamic issues with large antenna arrays, and inefficiencies in data retransmission processes.
Innovation Solution
The implementation of a virtual UE scheme using a distributed antenna system (DAS) that allocates hybrid automatic retransmission request (HARQ) process identifiers and switches virtual users in units of transmission time intervals (TTIs) to ensure high-rank communication and spatial diversity, allowing for flexible data retransmission and improved link stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large antenna array is installed outside vehicle to provide high quality service to high speed moving vehicle, then communication quality is improved, but aesthetic problems and aerodynamic problems occur
Solution Approach 1:
The patent divides the large antenna array into multiple distributed antenna units (DUs) that are separately installed at different locations (e.g., roof, trunk, bumper). Each DU transmits a portion of the overall signal, collectively providing high-quality communication service while avoiding the need for a single large antenna array that would cause aesthetic and aerodynamic issues.
2Reliability
If data retransmission is performed for first data packet received through first DU group, then data reliability is improved, but system complexity increases due to virtual user switching
Solution Approach 1:
The patent creates a virtual user (VU) as a logical copy or representation of the actual user equipment (UE) when communicating through distributed antenna units. This virtual user abstraction simplifies the management of data retransmission across multiple DUs by providing a unified interface, thereby reducing system complexity while maintaining data reliability through coordinated retransmission protocols.
Data Source
AI summary
Disclosed is a retransmitted data reception method comprising the steps of: receiving a first data packet from a base station through a first DU group including one or more DUs; receiving a second data packet, which is retransmitted for the first data packet, through a second DU group including another one or more of the DUs; and combining the first data packet and the second data packet so as to decode the combined data packet, wherein control information corresponding to the second data packet includes an HARQ process ID for notifying that the second data packet is retransmitted for the first data packet.