Communication method and apparatus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In satellite communication scenarios, IoT terminal devices face challenges in maintaining uplink synchronization for extended periods due to the expiration of GNSS information, leading to potential radio link failures and service interruptions.
Innovation Solution
A communication method that configures a measurement window for GNSS signal measurement and a random access occasion, allowing non-contention-based random access to maintain synchronization without frequent GNSS signal measurements, thereby reducing power consumption and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal device uses GNSS information for uplink synchronization in satellite communication, then synchronization accuracy is improved, but the GNSS information expires after a certain period leading to synchronization failure
Solution Approach 1:
The network device performs preliminary actions by configuring measurement windows and random access occasions before the GNSS information expires. The terminal device is instructed to perform GNSS signal measurement in predetermined time windows and initiate random access procedures at configured occasions, ensuring synchronization is maintained proactively before expiration occurs.
Solution Approach 2:
The system implements feedback mechanisms where the network device monitors the synchronization status and GNSS information validity, and dynamically adjusts measurement window configurations and random access occasion timings. This closed-loop feedback ensures that synchronization maintenance actions are timely and adaptive to actual system conditions.
2Reliability
If the terminal device performs frequent GNSS signal measurements to maintain synchronization, then synchronization reliability is improved, but power consumption increases
Solution Approach 1:
Instead of continuous or frequent GNSS signal measurements, the system implements periodic measurement at specifically configured measurement windows. The terminal device only activates GNSS signal measurement during these predetermined time intervals, significantly reducing power consumption while maintaining synchronization reliability through timely updates.
Solution Approach 2:
The terminal device autonomously manages synchronization by utilizing the configured measurement windows and random access occasions without requiring continuous network control. The device self-determines when to perform GNSS signal measurement and when to initiate random access procedures, optimizing power consumption while maintaining synchronization.
3Reliability
If the terminal device initiates random access procedures frequently to maintain synchronization, then synchronization is maintained, but system complexity increases
Solution Approach 1:
The network device performs preliminary configuration by setting up measurement windows and random access occasions in advance. This pre-configuration eliminates the need for frequent ad-hoc random access procedures, as the terminal device knows exactly when and where to perform synchronization maintenance actions, thereby reducing system complexity.
Solution Approach 2:
The system introduces intermediary elements including measurement windows and random access occasions as mediators between the terminal device and the synchronization maintenance process. These intermediaries structure and coordinate the synchronization procedures, making the system more manageable and less complex by providing clear temporal and procedural frameworks.
Data Source
AI summary
The present disclosure relates to communication methods and apparatuses. In one example method, a first communication apparatus receives a first message and a second message from a second communication apparatus, and determines a random access occasion based on the second message, where the first message is used to configure a measurement window of a GNSS signal for the first communication apparatus, the measurement window is used by the first communication apparatus to perform GNSS signal measurement, and an offset of a start location of the random access occasion relative to a start location of the measurement window is within a preset range.