Millimeter-Wave Beam Alignment Using RSRP-Guided Terminal Rotation
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Solution Overview
Problem
The challenge of ensuring optimal alignment between receive and transmit beams in millimeter wave communication systems is critical due to high frequency attenuation and susceptibility to rain fade, affecting transmit and receive gains and overall coverage and mobility.
Innovation Solution
A method and device for beam alignment that involves receiving multiple receive beams, determining the optimal receive beam based on RSRP, calculating the required rotation angle and direction to align the peak direction beam with the transmit beam, and adjusting the terminal device's location to form an optimal beam pair, aided by display prompts for user guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If millimeter wave is used for high bandwidth and low latency communication, then data transmission rate is improved, but beam alignment becomes difficult due to strong attenuation and susceptibility to rain fade
Solution Approach 1:
The system performs preliminary beam alignment by determining rotation angles and directions before actual data transmission. The terminal device calculates the required rotation to align its peak direction beam with the transmit beam, ensuring optimal alignment is established in advance to overcome millimeter wave attenuation and reliability issues
Solution Approach 2:
The system uses RSRP (Reference Signal Received Power) measurements as feedback to determine the optimal receive beam. Based on the RSRP values, the terminal device identifies which receive beam provides the strongest signal and uses this information to calculate the necessary rotation for aligning the peak direction beam with the transmit beam
2Reliability
If multiple receive beams are used to ensure beam alignment, then receive gain is improved, but device complexity increases
Solution Approach 1:
The terminal device autonomously determines the rotation angle and rotation direction needed to align its peak direction beam with the transmit beam. The device calculates this information based on the optimal receive beam identification, eliminating the need for complex network-controlled beam management and reducing overall system complexity while maintaining high receive gain
Data Source
AI summary
A beam alignment method includes receiving, at a current location by using a plurality of receive beams, a transmit beam from a network device, and determining reference signal received power (RSRP) of each of the plurality of receive beams; selecting an optimal receive beam from the plurality of receive beams based on the RSRP; determining, based on the optimal receive beam, a rotation angle and a rotation direction for a terminal device to align a peak direction beam with the transmit beam; and adjusting a location of the terminal device based on the rotation angle and the rotation direction, and forming an optimal beam pair by using the peak direction beam and the transmit beam at an adjusted location.