Beam-Specific Time Offset Determination via TC-RNTI
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Solution Overview
Problem
In satellite communication, determining a precise time offset between a terminal and a network device is challenging due to high-speed satellite movement, leading to inaccurate timing adjustments and unreliable data interaction, especially when multiple beams with different transmission delays are involved.
Innovation Solution
A method and device that utilize a temporary cell-radio network temporary identifier (TC-RNTI) in a message (MSG2) to determine a first time offset specific for a beam or user group, allowing terminals to compensate for transmission delays by correlating TC-RNTI values with predefined time offsets, and network devices to indicate support for these offsets, reducing resource overhead and improving data interaction reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single time offset is used for all beams, then device complexity is reduced, but measurement precision of transmission delay deteriorates
Solution Approach 1:
The patent segments the time offset parameter into beam-specific time offsets, where each beam has its own dedicated time offset value. This segmentation allows the system to accurately compensate for transmission delays specific to each beam while maintaining manageable complexity through structured management of multiple offset values.
Solution Approach 2:
The patent applies local quality by making time offsets specific to individual beams rather than uniform across all beams. Each beam receives a tailored time offset value that matches its specific transmission characteristics, improving precision without requiring complex global adjustment mechanisms.
2Measurement precision
If beam-specific time offsets are determined, then transmission delay compensation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-determining and configuring beam-specific time offset values before actual communication occurs. The network device prepares these offset values in advance based on beam characteristics, eliminating the need for complex real-time calculations and reducing operational complexity.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network device acts as a central coordinator that manages and distributes beam-specific time offset values to terminal devices. This intermediary approach simplifies the overall system by centralizing the complexity of managing multiple time offsets in one location rather than requiring each terminal to independently handle complex offset calculations.
3Adaptability or versatility
If multiple time offsets are supported, then adaptability to different beams is improved, but loss of information increases due to signaling overhead
Solution Approach 1:
The patent extracts the time offset information from general communication signaling and handles it through dedicated random access procedures. By separating time offset determination into a distinct phase using random access messages, the system reduces the burden on general signaling channels and minimizes information loss due to overhead.
Solution Approach 2:
The patent performs preliminary action by establishing beam-specific time offsets during the initial random access phase before regular data communication begins. This preliminary configuration ensures that time offset information is available before it is needed for data transmission, reducing the need for repeated signaling and minimizing information loss.
Data Source
AI summary
A method for determining a time offset is performed by a terminal. The method includes: determining, based on a value of a temporary cell-radio network temporary identifier (TC-RNTI) in a message 2 (MSG2), a first time offset specific for a beam or a first time offset specific for a user group.