Beam Recovery Request Handling in 5G High-Frequency Bands
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Solution Overview
Problem
In high-frequency bands used for 5G mobile communications, signal path loss increases, and existing methods fail to efficiently manage beam recovery requests due to terminal device movement or environmental changes, leading to communication failures.
Innovation Solution
A method for receiving beam recovery requests involves sending signals using both first and second-level beams, where the network device sends notification messages with index information to the terminal device, allowing it to determine the correct time-frequency resources for initiating beam recovery requests, thereby ensuring accurate signal alignment and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If beamforming is used in high frequency band to improve signal strength, then received signal power increases, but path loss increases greatly
Solution Approach 1:
The patent segments the beam management process into distinct phases: initial beam establishment using wide beams, followed by beam refinement using narrow beams. This segmentation allows the system to first acquire signal strength through wide coverage, then focus energy to compensate for high path loss in frequency bands above 6 GHz.
Solution Approach 2:
The patent implements dynamic beam adjustment mechanisms where the network device and terminal device continuously adapt beam directions and widths based on channel conditions, terminal movement, and environmental changes. This dynamic adaptation ensures optimal signal strength is maintained despite varying path loss conditions.
2Reliability
If terminal device moves or rotates or environment changes, then beam alignment may be maintained initially, but beam failure occurs over time
Solution Approach 1:
The patent implements periodic beam failure detection and recovery procedures. The terminal device periodically monitors beam quality metrics, and when degradation is detected, it initiates beam recovery requests. This periodic monitoring ensures reliable detection of beam failures caused by terminal movement or environmental changes.
Solution Approach 2:
The patent establishes feedback mechanisms where the terminal device reports beam quality information to the network device, which then adjusts beams accordingly. This closed-loop feedback system maintains beam alignment stability by continuously adapting to terminal movement and environmental variations.
3Ease of operation
If network device uses adjusted beam for communication, then signal directionality improves, but terminal device cannot learn time-frequency resource for beam recovery request
Solution Approach 1:
The patent applies preliminary action by having the network device pre-configure and notify the terminal device of time-frequency resources for beam recovery requests before beam adjustment occurs. This advance notification ensures the terminal device has the necessary resource information even after beam directions are changed, preventing information loss.
Solution Approach 2:
The patent uses notification messages as an intermediary carrier to transmit time-frequency resource information from the network device to the terminal device. This intermediary mechanism ensures that even when beam configurations change, the terminal device receives updated resource allocation information through the notification message channel.
Data Source
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AI summary
Embodiments of this application provide a method for sending a message. The method is applied to a terminal device and includes: sending a request sequence to a network device; receiving a response message sent by the network device, where the response message indicates a time-frequency resource that the network device allocates to the terminal device in response to the request sequence; and sending an indication message to the network device on the time-frequency resource, where the indication message indicates that the request sequence is used for at least one of the following: requesting beam recovery, requesting data scheduling, and requesting beam adjustment.