In-Vehicle DAS Signaling Reduction via Centralized Control
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Solution Overview
Problem
Conventional vehicular communication systems face challenges in providing high-quality mobile communication services at high speeds due to the limitations of large antenna arrays, which affect vehicle design and aerodynamics, leading to increased signaling overhead in distributed antenna systems (DAS).
Innovation Solution
The implementation of an in-vehicle DAS system using multiple small antenna units distributed within the vehicle, controlled by a central unit, which reduces signaling overhead by optimizing the transfer of information units based on decoding success and diversity of ray distribution, allowing for efficient cell selection and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large size antenna arrays are implemented for vehicular MIMO system, then high data rate/QoS for high speed UE is improved, but vehicle design and aerodynamics are worsened
Solution Approach 1:
The patent divides the large antenna array into multiple small antenna units distributed throughout the vehicle interior. Instead of implementing one large antenna array, the system segments it into several smaller units that can be integrated into the vehicle design without affecting aerodynamics, while collectively providing the required MIMO functionality for high data rates.
2Reliability
If multiple antenna units are distributed within the vehicle, then diversity gain is improved, but signaling overhead is worsened
Solution Approach 1:
The patent merges the control functions of multiple distributed antenna units into a single centralized unit (CU). The CU manages all distributed units (DUs) and handles the signaling operations centrally, thereby reducing the overall signaling overhead compared to having each DU independently managed. This consolidation maintains diversity gain while optimizing signaling efficiency.
3Reliability
If in-vehicle DAS system is implemented, then high quality mobile communication service at high speed is improved, but internal signaling burden is worsened
Solution Approach 1:
The patent introduces a centralized unit (CU) as an intermediary between the network and multiple distributed units (DUs). The CU acts as a mediator that manages all signaling operations, channel state information reporting, and coordination between DUs and the network. This intermediary structure reduces the internal signaling burden by centralizing control functions and simplifying the communication protocol between network and distributed antennas.
Data Source
AI summary
The present document is for a wireless communication with reduced internal signaling burden in the distributed antenna system (DAS). In the proposed method, a user equipment (UE) receives a first information unit from the network by a first distributed unit (DU) among multiple DUs distributed within the UE. The first DU reports reception information of the first information unit to a central unit (CU) of the UE, wherein the CU controls the multiple DUs. The first DU receives, from the CU, a direction regarding a transfer of the first information unit to the CU, and transfers the first information unit to the CU when the direction indicates a specific value.