TRP Physical Layer Sublayers for Multi-DU Scheduling
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Solution Overview
Problem
Current mobile communication systems face challenges in providing reliable high-speed service data using base stations with a distributed radio access structure, particularly in maintaining signal quality at the boundary of transmission/reception points (TRPs) and ensuring seamless handover between TRPs.
Innovation Solution
The method involves a TRP operation that receives scheduling information and data from distributed units (DUs) and transmits them simultaneously to terminals through different physical layers, with the ability to switch connections between DUs based on scheduling messages, utilizing PHY-Low-S and PHY-Low-Comm sublayers for efficient data transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a distributed base station structure with multiple TRPs is deployed to expand coverage area, then the radio communication coverage area increases, but signal quality degradation occurs at TRP boundaries requiring complex handover management
Solution Approach 1:
The base station is segmented into multiple Transmission Reception Points (TRPs) that can be geographically distributed. Each TRP operates as an independent transmission unit with its own physical layer processing capabilities, allowing the coverage area to be expanded by adding more TRPs without requiring a complete base station relocation.
Solution Approach 2:
Multiple TRPs are merged into a single logical base station through a unified higher-layer controller that coordinates scheduling and resource allocation across all TRPs. This merging allows seamless handover between TRPs by maintaining a unified view of terminal resources and scheduling information, thereby preserving signal quality at boundaries.
2Productivity
If multiple DUs are connected to a single TRP to increase data transmission capacity, then the data transmission speed increases, but the device complexity increases due to multiple physical layer connections
Solution Approach 1:
The patent introduces a hierarchical dimension to the physical layer structure, creating PHY-Low-S and PHY-Low-Comm sublayers. This dimensional organization allows multiple DUs to connect to a single TRP through structured sublayer interfaces, increasing data transmission capacity while managing complexity through systematic layering rather than ad-hoc connections.
Solution Approach 2:
The PHY-Low-Comm sublayer acts as an intermediary between multiple PHY-Low-S sublayers and the upper physical layer. This intermediary structure consolidates multiple DU connections through a common interface, enabling high-speed data transmission from multiple DUs while reducing the apparent complexity at the TRP level by providing a unified access point.
3Ease of operation
If scheduling information is centralized in one DU to simplify resource management, then the ease of operation improves, but the response time for data transmission increases due to centralized processing bottleneck
Solution Approach 1:
The patent implements local quality by enabling each DU to generate and process scheduling information independently for its connected terminals. This distributed scheduling approach allows each DU to make local resource allocation decisions without waiting for centralized processing, thereby reducing scheduling response time while maintaining resource management coordination through inter-DU communication.
Solution Approach 2:
The system implements feedback mechanisms where DUs exchange scheduling information and resource status with each other and with the TRP. This feedback loop enables coordinated resource management across multiple DUs, allowing each DU to operate autonomously with local scheduling decisions while maintaining overall resource optimization through continuous information exchange.
Data Source
AI summary
An operation method of a transmission and reception point (TRP) constituting a base station may include: receiving, from a first distributed unit (DU) and through a first physical layer, scheduling information of a first terminal and first data to be transmitted to the first terminal; receiving, from a second DU and through the first physical layer, scheduling information of a second terminal to be provided to the second terminal and second data to be transmitted to the second terminal; and simultaneously transmitting the first data and the second data to the first terminal and the second terminal, respectively, through a second physical layer based on the scheduling information of the first terminal and the scheduling information of the second terminal.