Sidelink Groupcast Beam Selection to Cut Delay and Interference
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Solution Overview
Problem
Sidelink communication in groupcast services experiences transmission delays and increased power consumption due to unnecessary beam transmissions in omni-direction, leading to interference with other communication nodes.
Innovation Solution
Implement beamforming techniques to transmit sidelink signals and channels in specific directions based on feedback information, narrowing the transmission area and optimizing beam sweeping intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If beam sweeping scheme is used for groupcast service, then coverage area is improved, but transmission delay increases and power consumption increases
Solution Approach 1:
The transmitting terminal performs beam sweeping to transmit SS/PBCH blocks in advance before actual data transmission. This preliminary beam sweeping allows receiving terminals to identify suitable beams and report feedback information, enabling the transmitting terminal to determine optimal beams for subsequent groupcast transmission, thereby avoiding delays during actual data transmission.
Solution Approach 2:
Receiving terminals measure the quality of SS/PBCH blocks received through beam sweeping and report feedback information including beam indices and quality metrics to the transmitting terminal. The transmitting terminal uses this feedback to determine the optimal beam for groupcast transmission, ensuring efficient and targeted communication while minimizing transmission delays.
2Area of stationary object
If beam sweeping scheme is used for groupcast service, then coverage area is improved, but power consumption increases
Solution Approach 1:
Beam sweeping and SS/PBCH block transmission are performed in advance during idle periods or before groupcast services are activated. This preliminary action allows the system to establish beam directions and receive feedback without consuming excessive power during actual data transmission, as the optimal beam is already determined from prior measurements.
Solution Approach 2:
The feedback mechanism enables the transmitting terminal to identify the optimal beam direction based on receiving terminal reports. By using this feedback information, the transmitting terminal can concentrate transmission energy in specific directions rather than continuously sweeping beams, significantly reducing power consumption during groupcast transmission while maintaining coverage.
3Area of stationary object
If omni-directional beam transmission is used, then coverage area is improved, but interference to other communication nodes increases
Solution Approach 1:
Instead of using omni-directional beams for all transmissions, the system applies different beam characteristics to different spatial regions. Beam sweeping covers all directions to establish coverage, but actual groupcast transmission uses focused directional beams tailored to the specific locations of receiving terminals, thereby minimizing interference to other communication nodes while maintaining adequate coverage.
Solution Approach 2:
Receiving terminals report feedback information including their locations and preferred beam directions. The transmitting terminal uses this feedback to determine optimal beam directions for groupcast transmission, ensuring that energy is concentrated toward receiving terminals rather than being transmitted omnidirectionally, thus reducing interference to other communication nodes in different directions.
Data Source
AI summary
Disclosed are a method and a device for sidelink groupcast communication. A method for operating a transmitting terminal comprises the steps of: transmitting an SS/PBCH block for sidelink communication in all directions by using a beam sweeping method; receiving, from a plurality of receiving terminals, first feedback information about the SS/PBCH block; and transmitting a sidelink channel in a specific direction by using beams of the transmitting terminal that are determined on the basis of the first feedback information. Therefore, communication system performance can be improved.