Network Access Assistance for Satellite Wake-Up Cell Selection
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Solution Overview
Problem
In non-terrestrial networks, terminals experience increased power consumption and communication delay due to the need to scan all frequency points for network access after waking up from a disconnected state, as serving and neighboring cell information becomes invalid due to satellite movement.
Innovation Solution
Providing assistance information to terminals to facilitate targeted cell selection or reselection based on predicted cell locations, reducing the need to scan all frequency points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal scans all frequency points to select an appropriate network after waking up from disconnected state, then the terminal can ensure reliable network access, but the power consumption increases and access time is extended
Solution Approach 1:
The network device performs preliminary actions by predicting the terminal's location after discontinuous reception and pre-calculating the target cell information. This assistance information is provided to the terminal before the terminal needs to access the network, allowing the terminal to skip the exhaustive frequency scanning process and directly access the predicted target cell, thereby reducing power consumption while maintaining access reliability
Solution Approach 2:
The network device acts as an intermediary by generating and providing assistance information that mediates between the terminal and the network access process. This assistance information contains predicted target cell details that guide the terminal's access, replacing the need for the terminal to independently scan all frequencies, thus reducing energy consumption while ensuring reliable connection
2Reliability
If the terminal scans all frequency points to select an appropriate network after waking up from disconnected state, then the terminal can ensure reliable network access, but the communication delay increases
Solution Approach 1:
The network device performs preliminary location prediction and target cell calculation before the terminal initiates network access. By providing assistance information containing the predicted target cell information in advance, the terminal can immediately access the network without performing time-consuming frequency scans, thereby significantly reducing access delay while maintaining connection reliability
Solution Approach 2:
The assistance information acts as an intermediary that bridges the terminal and network access process. It contains pre-calculated target cell information that enables the terminal to bypass the exhaustive frequency scanning procedure, thus reducing communication delay while ensuring reliable network access
3Adaptability or versatility
If the satellite moves to a different location, then the terminal can maintain mobility and coverage, but the previously obtained serving cell and neighboring cell information becomes invalid
Solution Approach 1:
The network device uses feedback about satellite movement and terminal location to dynamically update and provide accurate target cell information. By continuously tracking satellite position changes and calculating the terminal's likely location after discontinuous reception, the network device generates up-to-date assistance information that remains valid despite satellite mobility, thus maintaining both terminal mobility and information accuracy
Solution Approach 2:
The system dynamically changes parameters such as satellite position, terminal location prediction, and target cell identification based on real-time conditions. By updating these parameters and providing fresh assistance information, the system maintains cell information validity even as satellites move, thereby supporting terminal mobility without information obsolescence
Data Source
AI summary
A method and a device for network access assistance are disclosed. A network device sends assistance information to a terminal. The assistance information is configured to be used by a terminal to access a network when waking up from a disconnected state. The terminal receives the assistance information sent by the network device. The terminal accesses the network according to the assistance information, in response to waking up from the disconnected state.