Random Access Completion Detection During LTM Cell Switching
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Solution Overview
Problem
In scenarios where a random access triggered by the Physical Downlink Control Channel (PDCCH) order during L1L2 Triggered Mobility (LTM) cell switch results in the absence of a random access response (RAR), the terminal device and network device are unable to determine whether the random access is completed, hindering further processing such as re-initiating random access or providing network services.
Innovation Solution
A method for the terminal device and network device to perform first preset processing, including starting response windows and determining completion based on receiving a response message within a specified time, and adjusting processing strategies based on trigger messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal device sends a random access preamble during LTM cell switch without receiving a random access response, then the cell switch process continues, but the terminal and network device cannot determine whether random access is completed
Solution Approach 1:
The patent introduces a feedback mechanism where the terminal device monitors for response messages (RAR or LTM cell switch command) within a configured response window after sending the random access preamble. This feedback loop enables both terminal and network device to determine random access completion status, resolving the information loss problem while maintaining efficient cell switching.
2Adaptability or versatility
If the terminal device cannot determine random access completion, then it cannot perform further processing such as re-initiating random access or obtaining network services
Solution Approach 1:
The patent configures a response window in advance before the terminal device sends the random access preamble. This preliminary setup ensures that the terminal and network device have a predefined mechanism to determine random access completion status, enabling timely further processing such as re-initiating random access or obtaining network services without unnecessary delays.
3Reliability
If the network device cannot complete random access with the terminal, then it cannot execute connection configuration or provide services
Solution Approach 1:
The patent establishes a bidirectional feedback mechanism where both terminal and network device monitor for response messages within the configured response window. This ensures both parties have consistent knowledge of random access completion status, enabling reliable connection configuration and service provisioning while maintaining efficient resource utilization.
Data Source
AI summary
A processing method includes: performing, via a terminal device, a first preset processing in response to sending a random access preamble, and determining whether a preset process is completed according to a preset strategy. Through the technical solution of the present application, the terminal device and/or the network device can determine whether random access is completed in the target cell, so as to perform further processing, such as having a corresponding processing flow after determining that the random access is not completed.