5G Random Access Beam Redetermination Method
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G systems, mismatched beams between network devices and terminal devices during the random access process lead to failed transmissions, significantly affecting efficiency and causing delays.
Innovation Solution
A method where terminal devices determine beam information for groups of random access signals, retransmitting if no response is received, and network devices prohibit responses if beams do not match, allowing for beam re-determination and improved matching for successful signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If beamformed transmission is used in 5G random access, then transmission directionality and coverage are improved, but beam mismatch between network device and terminal device causes transmission failure
Solution Approach 1:
The terminal device performs beam sweeping and determines beam information for N groups of random access signals before actual transmission. The network device also pre-configures beam information for receiving signals. This preliminary beam alignment ensures that when random access signals are transmitted, the beam directions are already matched, preventing transmission failure due to beam mismatch.
Solution Approach 2:
The patent implements dynamic beam selection where the terminal device can choose from multiple beam options (N groups of signals with M signals each) based on current channel conditions. The beam information includes beam directions and corresponding time-frequency resources, allowing the system to adaptively select the best beam configuration for each random access attempt.
2Reliability
If the terminal device transmits multiple groups of random access signals with different beam information, then the probability of successful reception is improved, but the complexity of beam management increases
Solution Approach 1:
The patent combines multiple beam information configurations into N groups, where each group contains M random access signals. Instead of managing completely separate beam configurations, the system organizes them in a structured grouping where beam information is systematically associated with specific time-frequency resources, simplifying the management complexity while maintaining multiple beam options.
Solution Approach 2:
The random access signal transmission is segmented into N groups, with each group containing M signals using specific beam information. This segmentation allows the terminal device to systematically try different beam configurations in an organized manner, making beam management more tractable while still exploring multiple beam options to ensure successful reception.
3Loss of information
If the network device prohibits sending response messages when beams do not match, then unnecessary error responses are reduced, but the terminal device experiences longer delays in detecting transmission failure
Solution Approach 1:
The network device provides feedback to the terminal device about beam matching status. When the terminal device transmits random access signals using predetermined beam information, the network device can respond with acknowledgment or rejection based on whether the beams matched. This feedback mechanism allows the terminal device to quickly identify beam mismatch conditions and adjust its beam selection, reducing both unnecessary responses and detection delays.
Data Source
AI summary
A signal transmission method comprises: a terminal device determining beam information about N groups of random access signals, wherein the beam information about the N groups of random access signals is the same, and each group of random access signals comprises M random access signals, M and N being positive integers; if the terminal device sends the N groups of random access signals to a network device according to the beam information about the N groups of random access signals, while does not receive a response message sent by the network device for the N groups of random access signals, redetermining the beam information about the N groups of random access signals; and the terminal device re-transmitting at least one random access signal in the N groups of random access signals to the network device according to the redetermined beam information about the N groups of random access signals.