Discovery Reference Signal Beam Switching for Coverage Alignment
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Solution Overview
Problem
Next-generation wireless communication systems face challenges in supporting diverse user environments and increased communication capacity due to the need for precise beam alignment with very short wavelengths, which limits coverage when using narrow beams and reduces throughput with wide beams.
Innovation Solution
A method for transmitting a discovery reference signal (DRS) that allows for adaptive selection between a switching mode for narrow beams and a repetition mode for wide beams, enabling greater coverage by controlling beam direction and power allocation across multiple time resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a narrow beam is transmitted using very short wavelength, then beamforming gain and coverage are increased, but it becomes necessary to align beam direction precisely which reduces ease of operation
Solution Approach 1:
The system dynamically switches between switching mode and repetition mode based on service requirements. In switching mode, narrow beams are transmitted with precise alignment for maximum coverage. In repetition mode, wide beams are transmitted without precise alignment requirements, making the system adaptable to different operational conditions and reducing overall alignment difficulty.
Solution Approach 2:
The beam width parameter is changed based on the selected transmission mode. Narrow beams (small beam width parameter) are used in switching mode for coverage enhancement, while wide beams (large beam width parameter) are used in repetition mode for ease of operation. This parameter adjustment resolves the contradiction between coverage and alignment difficulty.
2Ease of operation
If a wide beam is transmitted using the same transmit power, then ease of operation is improved, but coverage to be supported is reduced
Solution Approach 1:
The system dynamically selects between switching mode (narrow beam) and repetition mode (wide beam) based on service requirements. When coverage is prioritized, switching mode with narrow beams is selected. When ease of operation is prioritized, repetition mode with wide beams is selected. This dynamic selection resolves the contradiction between coverage and ease of operation.
3Area of stationary object
If narrow beam transmission mode is used, then coverage is enhanced, but device complexity increases due to mode selection and switching requirements
Solution Approach 1:
The base station dynamically selects between switching mode and repetition mode based on service requirements and channel conditions. The wireless device is configured with the selected mode through RRC signaling, enabling the device to appropriately receive and process DRS signals. This dynamic mode selection with proper configuration management resolves the contradiction between coverage enhancement and device complexity.
4Device complexity
If repetition mode with wide beam is used, then device complexity is reduced, but coverage and service reliability are reduced
Solution Approach 1:
The system dynamically selects between switching mode and repetition mode based on service requirements. When service reliability is prioritized, switching mode with narrow beams and precise alignment is selected. When device complexity reduction is prioritized, repetition mode with wide beams is selected. This dynamic selection based on service requirements resolves the contradiction between device complexity and service reliability.
Data Source
AI summary
A method and a device for transmitting a discovery reference signal (DRS) are provided. The device selects, as a DRS transmission mode, either a switching mode for transmitting a narrow beam or a repeating mode for transmitting a wide beam. The narrow beam covers greater coverage than that of the wide beam. The device transmits the DRS in a plurality of time resources according to the selected DRS transmission mode.