Beam Signal Scheduling for SFN Cell-Edge Coverage in NR
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Solution Overview
Problem
The power loss at the cell edge in SFN technology cannot meet the coverage requirements of NR network deployment for user equipment (UE).
Innovation Solution
A beam signal transmission method involving network-side nodes that determine mode information for sending beams, ensuring coordination and synchronization among nodes, allowing transmission signals to be sent sequentially in a time division manner to superpose received signals at the cell edge, enhancing signal power using SFN technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SFN technology is used to increase signal power at cell edge, then receiving performance is improved, but coverage requirements for NR network deployment cannot be met due to power loss
Solution Approach 1:
The patent segments the cell coverage area into multiple beam coverage areas, with each beam covering a specific directional sector. Instead of using a single omnidirectional signal, the system divides the coverage into multiple directional beams that can be transmitted simultaneously, allowing the cell edge to receive signals from multiple beams rather than relying solely on SFN power superposition.
Solution Approach 2:
The patent introduces spatial dimensionality by using multiple beams from different directions to cover the cell area. Each beam provides coverage from a specific angular sector, creating a three-dimensional coverage structure (azimuth, elevation, and time) that enhances signal availability at the cell edge without relying exclusively on power superposition from SFN.
2Area of stationary object
If beamforming technology is used to divide cell coverage into multiple beam areas, then directional coverage is improved, but signal power at cell edge remains insufficient
Solution Approach 1:
The patent merges multiple beam signals that cover different directional sectors to provide comprehensive cell coverage. By coordinating multiple beams to cover the entire cell area simultaneously, the system ensures that any point in the cell, including the cell edge, can receive signals from at least one beam, while cell edge areas may receive signals from multiple beams that can be combined for enhanced power.
3Device complexity
If traditional non-SFN technology is used, then signal transmission is simpler, but signals from other cells become interference rather than beneficial superposition
Solution Approach 1:
The patent applies local quality by configuring different beam transmission parameters for different spatial locations and directions. Each beam is optimized for its specific coverage area, with parameters such as beam width, direction, and time allocation tailored to local requirements. This allows the system to achieve SFN-like benefits in specific local areas without requiring complex coordination across the entire network.
Data Source
AI summary
A beam signal transmission method, a beam signal transmission apparatus, a network-side node and a terminal are provided. The method includes: obtaining mode information about a plurality of sending beams of a first network-side node; sending transmission signals sequentially through each beam in a time division manner in one sending period according to the plurality of beams indicated by the mode information.