Adaptive Beam Width and Direction Adjustment for mmWave Random Access
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Solution Overview
Problem
In mobile communication systems using mmWave, the high propagation loss and short wavelength lead to reduced radio wave reach and coverage, causing communication difficulties due to mismatched beam directions between base stations and terminals, especially when beamforming is employed.
Innovation Solution
A method and apparatus that allow both transmitters and receivers to adaptively adjust the beam direction and width during retransmission, considering criteria such as beam gain history and previous transmission failure history, to improve retransmission success probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If beamforming is used in mmWave communication, then transmission distance and data rate are improved, but communication reliability deteriorates due to beam mismatch between transmitter and receiver
Solution Approach 1:
The patent applies dynamics by making the beam configuration adaptive rather than static. The transmitter and receiver dynamically adjust beam direction and width based on real-time communication conditions, including retransmission scenarios. This allows the system to maintain high data rates through focused beams while improving reliability by adapting to beam mismatch conditions during random access and retransmission
Solution Approach 2:
The patent changes physical parameters of the beam including direction angle and beam width. By adjusting these parameters based on communication state (initial access vs. retransmission), the system optimizes both data rate and reliability. The receiver and transmitter exchange information about beam parameters and adjust them to achieve reliable communication while maintaining high speed
2Length of stationary object
If a narrow beam is used to increase beam gain, then transmission distance is improved, but coverage area is reduced
Solution Approach 1:
The system dynamically adjusts beam width based on communication phase. During initial random access, a wider beam provides broader coverage to ensure the receiver can detect the transmission. During retransmission, when the beam direction is already established, the beam width is narrowed to increase gain and extend transmission distance, thus dynamically balancing coverage and range
3Stability of the object's composition
If beam direction is fixed to maintain stable communication, then communication stability is improved, but adaptability to channel changes deteriorates
Solution Approach 1:
The patent implements dynamic beam adjustment where the transmitter and receiver adapt beam direction based on communication feedback. During retransmission, if the initial beam fails, the system adjusts the beam direction to alternative angles while maintaining stable communication through coordinated changes at both ends. This dynamic adaptation maintains stability through systematic adjustment rather than random changes
Data Source
AI summary
A method for setting a beam in a mobile communication system includes determining at least one of a beam width and a beam direction in consideration of a criteria value in response to a failure of a random access attempt, and retransmitting a beam based on the determined at least one of the beam width or the beam direction. The criteria value includes at least one of a beam gain history of a candidate beam combination and a previous transmission failure history.