UE Beam Selection for Msg3 Transmission Reliability
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Solution Overview
Problem
Wireless communication networks face interference issues due to multiple base stations and user equipment (UE) transmissions, degrading performance, especially as demand for mobile broadband access increases, leading to congested networks and reduced reliability in Msg3 transmissions.
Innovation Solution
A method and apparatus for determining a selected beam for Msg3 transmissions in wireless communication systems, where a UE transmits PRACH transmissions using multiple beams and receives an indication from the network node to select the best beam for subsequent Msg3 transmissions, enhancing reliability by minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple beams are used for PRACH transmission to improve reliability, then the reliability of Msg3 transmission is improved, but the device complexity increases
Solution Approach 1:
The UE performs preliminary beam sweeping and transmission of multiple PRACH messages using different beams before the actual Msg3 transmission. The network node evaluates these preliminary transmissions and provides feedback on the best beam, allowing the UE to select the optimal beam for subsequent Msg3 transmissions without having to complexly determine the best beam in real-time during the actual communication.
Solution Approach 2:
The network node provides feedback information to the UE indicating which beam performed best for PRACH transmission. This feedback mechanism simplifies the UE's task by directly providing the beam selection recommendation, eliminating the need for the UE to independently complexly analyze and determine the optimal beam for Msg3 transmission.
2Reliability
If beam selection is performed to reduce interference, then the signal quality is improved, but the time required for beam determination increases
Solution Approach 1:
The beam evaluation and selection process is performed in advance during the PRACH transmission phase before the actual Msg3 communication begins. By completing the complex beam determination task preliminarily, the system avoids time-consuming beam analysis during the critical Msg3 transmission window, thus reducing latency.
Solution Approach 2:
The network node provides timely feedback on beam performance after receiving PRACH transmissions. This feedback mechanism allows the UE to quickly identify the best beam without requiring extensive real-time analysis, thereby reducing the time needed for beam determination while maintaining high signal quality.
3Reliability
If multiple PRACH transmissions are sent using different beams to ensure reliable reception, then the reception reliability is improved, but the transmission time increases
Solution Approach 1:
The system transmits multiple PRACH messages using different beams in a structured periodic manner, with the network node receiving and evaluating each transmission. This periodic transmission approach allows the network to systematically assess beam performance while managing transmission time efficiently, as each periodic transmission can be processed and feedback provided in a timely manner.
Solution Approach 2:
The network node provides feedback after receiving PRACH transmissions, enabling the UE to identify the best beam quickly. This feedback mechanism allows the system to achieve reliable reception through multiple beam transmissions while minimizing total transmission time by avoiding unnecessary prolonged transmission periods.
Data Source
AI summary
This disclosure provides systems, methods, and devices for wireless communication that support determination of a UE beam for Msg3 transmission. In a first aspect, a method of wireless communication includes transmitting, to a network node, a first physical random access channel (PRACH) transmission and one or more repetitions of the first PRACH transmission using a plurality of beams, receiving, from the network node, a response to the first PRACH transmission comprising an indication of a selected beam of the plurality of beams, determining the selected beam based on the indication of the selected beam and based on transmission of the first PRACH transmission and one or more repetitions of the first PRACH transmission using the plurality of beams, and transmitting one or more message three (Msg3) transmissions to the network node using the selected beam.