NTN Paging Response via TN Cell Reselection and Priority Selection
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transitioning wireless transmit/receive units (WTRUs) between non-terrestrial networks (NTN) and terrestrial networks (TN) for paging and response, particularly in managing cell reselection and resource allocation based on priority and signal quality.
Innovation Solution
A WTRU receives a paging message from an NTN node indicating target TN cells with priority and timing information, selects a TN cell based on priority, signal quality, and frequency differences, and sends an access request using specified uplink resources, with mechanisms for timer-based retries and subsequent monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a WTRU monitors paging on NTN and receives a paging message indicating response on TN, then the WTRU can respond to paging in a different network type, but the WTRU must perform cell reselection and manage multiple network parameters which increases complexity
Solution Approach 1:
The patent introduces a paging message as an intermediary carrier that conveys target cell information, priority indicators, and timing advance values from the NTN network to the WTRU. This intermediary structure enables the WTRU to understand and execute the network transition without directly managing complex interworking protocols, thereby reducing device complexity while maintaining adaptability.
Solution Approach 2:
The patent applies preliminary action by providing the WTRU with target TN cell information, priority values, and timing advance parameters in advance through the paging message, before the WTRU actually performs cell reselection. This allows the WTRU to prepare for the network transition with all necessary parameters already configured, simplifying the reselection process and reducing operational complexity.
2Reliability
If the WTRU selects TN cell based on priority information and signal quality, then the connection reliability is improved, but the selection process requires evaluating multiple parameters increasing processing complexity
Solution Approach 1:
The patent applies local quality by introducing priority information that is specific to each target TN cell indicated in the paging message. Instead of requiring the WTRU to evaluate all possible cells uniformly, the network provides prioritized information for specific candidate cells, allowing the WTRU to focus its evaluation on predetermined targets with known quality characteristics, thereby improving reliability while reducing processing complexity.
Solution Approach 2:
The patent changes the parameter representation by introducing priority indicators and timing advance values in the paging message that transform the cell selection process. Rather than requiring complex real-time evaluation of multiple radio parameters, the WTRU receives pre-processed priority information that directly guides cell selection, simplifying the decision-making process while ensuring reliable connection establishment.
3Productivity
If the WTRU sends access request using specified uplink resources with timing information, then the resource allocation efficiency is improved, but the WTRU must accurately apply timing advance values which increases precision requirements
Solution Approach 1:
The patent applies preliminary action by providing the WTRU with timing advance values and uplink resource allocations in advance through the paging message, before the WTRU sends the access request. This allows the WTRU to pre-configure its transmission timing and resource usage, ensuring efficient resource allocation while reducing the precision burden during actual transmission since the timing parameters are already determined and provided by the network.
Data Source
AI summary
Method and apparatus are described herein for paging and responding in different networks, i.e. a non-terrestrial network, NTN, to a terrestrial network, TN. A wireless transmit/receive unit, WTRU, e.g., camping in an idle or inactive state, monitors for paging on a NTN network. The WTRU receives a paging message on the NTN. The paging message provided an indication to respond on a TN network. The WTRU performs a cell reselection to the TN. The WTRU responds to the paging on the NTN network by sending a paging response message on the TN network.