Beam-Based Random Access Signaling for High-Frequency Links
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Solution Overview
Problem
Existing mobile communications systems lack effective solutions for beam-based receiving and sending of messages in the random access process, particularly in high-frequency communication with massive antennas, which are prone to interference and path loss.
Innovation Solution
A random access method that regulates beam selection by using a target beam from selectable beams for transmitting and receiving messages, such as Msg1, Msg2, Msg3, or Msg4, based on associative relationships or quasi-co-location with downlink and uplink beams, configured through dedicated RRC messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam-based receiving and sending is implemented in random access process, then transmission efficiency and accuracy are improved, but device complexity increases due to need for beam selection and management
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple beams with different characteristics (first beams with good downlink reference signal quality, second beams with good uplink reception, third beams with good downlink reception) before the random access process. The terminal device selects from these pre-configured beams based on stored beam information, avoiding the need for real-time beam measurement and selection during the random access procedure, thus reducing complexity while maintaining transmission efficiency.
Solution Approach 2:
The patent applies local quality by differentiating beams into multiple types with specific local characteristics: first beams optimized for downlink reference signal quality, second beams optimized for uplink reception, and third beams optimized for downlink reception. This allows the terminal device to select beams with appropriate local qualities for different random access message transmissions, improving transmission efficiency for each specific communication scenario.
2Measurement precision
If multiple beams are used for random access messages, then transmission accuracy is improved, but the process becomes more complex requiring beam quality assessment and selection
Solution Approach 1:
The patent applies preliminary action by having the network side pre-assess and configure multiple beams with different qualities before the terminal device needs to perform random access. The beam quality assessment is performed in advance by the network, and the results are stored and provided to the terminal device, eliminating the need for the terminal to perform complex real-time beam measurement and assessment.
Solution Approach 2:
The patent applies the intermediary principle by introducing beam information as an intermediary element that carries beam quality assessment results from the network side to the terminal device. This beam information includes identifiers and quality metrics, serving as a mediator that enables the terminal to make informed beam selection decisions without performing complex assessment procedures itself.
3Reliability
If beam selection is regulated with multiple criteria, then transmission success rate is improved, but processing time increases for beam determination
Solution Approach 1:
The patent applies preliminary action by pre-determining and storing beam information including quality metrics and identifiers before the random access process. When the terminal device needs to transmit random access messages, it simply retrieves pre-configured beam information and selects from pre-categorized beams (first, second, or third beams) based on stored criteria, significantly reducing the time required for beam determination compared to real-time assessment.
Solution Approach 2:
The patent applies dynamics by enabling flexible beam selection where the terminal device can dynamically choose from different beam types (first beams for downlink quality, second beams for uplink reception, third beams for downlink reception) based on the specific requirements of each random access message transmission, optimizing the balance between transmission success rate and processing time.
Data Source
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AI summary
This disclosure provides a random access method and a communications device. The method includes: transmitting a message in a random access process by using a target beam in selectable beams, where the message in the random access process is an Msg1, an Msg2, an Msg3, or an Msg4.