Terminal Resource Selection for High-Frequency Beam Coverage
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Solution Overview
Problem
In wireless communication systems using high frequency bands, such as those above 52.6 GHz, propagation loss is significant, requiring complex area designs for effective beam forming with narrow beam widths to compensate for this loss.
Innovation Solution
A terminal is equipped with a reception unit to receive a set of first resources including synchronization signals and broadcast channels from a base station, a control unit to determine the best resource based on reception quality, and a communication unit to execute a random access procedure using the determined resource.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam forming with narrow beam width is applied to compensate for propagation loss in high frequency bands, then signal quality is improved, but coverage area is reduced
Solution Approach 1:
The coverage area is divided into multiple sectors, each served by a narrow beam. Multiple narrow beams are transmitted from different antenna ports, and the terminal selects the best beam for communication. This segmentation allows the system to maintain narrow beam widths for signal quality while collectively covering a larger area through multiple beams.
Solution Approach 2:
The system transitions from a single-dimension coverage approach to a multi-dimensional beam space. By utilizing multiple antenna ports and spatial dimensions, the system can transmit multiple narrow beams simultaneously, each covering a specific spatial sector, thereby extending overall coverage while maintaining narrow beam benefits for signal quality.
2Reliability
If multiple resources are provided for synchronization signals and broadcast channels, then coverage control is improved, but device complexity increases
Solution Approach 1:
The base station pre-configures multiple resources for synchronization signals and broadcast channels, each associated with specific coverage areas. The terminal receives information about these pre-configured resources and their corresponding coverage characteristics, allowing it to select the appropriate resource before attempting access. This preliminary configuration reduces the complexity of real-time resource management.
Solution Approach 2:
The terminal autonomously determines which resource to use by evaluating reception quality metrics for each available resource and selecting the most suitable one based on pre-configured information. This self-service approach allows the terminal to independently make resource selection decisions without requiring complex centralized control, thereby managing system complexity while improving coverage control.
Data Source
AI summary
A terminal includes a reception unit that receives, from a base station, a set including a plurality of first resources that include at least a synchronization signal and optionally further include a broadcast channel, a control unit that determines which of the first resources included in the set is to be used based on a reception quality controlled for each of the first resources, and a communication unit that executes a random access procedure with the base station based on information included in the determined first resource.