NTN Mobile-Terminated Paging with Pre-Alert Delay for Uplink Access
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Solution Overview
Problem
Wireless communications systems face challenges in establishing reliable mobile-terminated calls in non-terrestrial networks due to poor uplink connections, especially in locations with weak signal strength, leading to failed random access channel procedures.
Innovation Solution
Implementing delay times and pre-paging alerts in user equipment (UE) to improve channel conditions, allowing users to reposition for better signal strength before establishing connections, and utilizing priority-based messaging for high-priority communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE immediately attempts to establish an uplink connection upon receiving a paging message, then the response time is reduced, but the connection establishment may fail due to poor uplink channel conditions
Solution Approach 1:
The network node transmits a pre-paging alert before the actual paging message to give the UE advance warning. This preliminary action allows the UE to prepare for the upcoming paging response by potentially improving its uplink channel conditions (e.g., by moving to a location with better signal strength) before the connection establishment attempt is required.
Solution Approach 2:
The system dynamically adjusts the timing of the paging response based on channel conditions. Instead of using a fixed immediate response, the UE can delay its connection establishment attempt until channel conditions improve, making the system adaptive to varying radio environments rather than rigid.
2Reliability
If the UE delays the uplink connection establishment to improve channel conditions, then the connection reliability is improved, but the response time increases
Solution Approach 1:
The pre-paging alert serves as a preliminary notification that allows the UE to begin channel improvement actions (such as user repositioning) before the actual paging response is needed. This advance warning enables the system to trade time strategically - the delay is planned and purposeful rather than reactive.
Solution Approach 2:
The system provides a time cushion between the pre-paging alert and the expected paging response. This cushion time is intentionally built into the system to allow channel conditions to improve before the critical connection establishment attempt, buffering against the risk of failure without excessively increasing overall response time.
3Reliability
If the network transmits a pre-paging alert to enable UE repositioning, then coverage and channel quality are improved, but the network signaling overhead increases
Solution Approach 1:
The paging process is segmented into two distinct parts: a pre-paging alert and a subsequent paging message. This segmentation allows the network to provide advance notice to UEs that may need to reposition, while keeping the actual paging traffic separate. The alert can be transmitted using efficient signaling mechanisms.
Solution Approach 2:
The pre-paging alert acts as an intermediary message that facilitates the overall paging process. Rather than directly transmitting the full paging message, the network uses this intermediate alert to trigger channel improvement actions, reducing the likelihood of failed connection attempts and potentially reducing the need for retransmissions.
4Reliability
If the UE waits for user input before establishing connection, then the user can improve positioning for better signal, but the connection establishment time increases
Solution Approach 1:
The pre-paging alert triggers user action in advance, allowing the user to reposition the UE before the connection establishment is actually required. This preliminary user engagement, prompted by the alert, enables physical repositioning that improves signal strength without adding critical delay to the connection process.
Solution Approach 2:
The system allows dynamic user intervention based on the pre-paging alert. The user can choose to reposition the UE during the delay period, making the system adaptable to the user's ability to physically move the device. This dynamic approach balances automated operation with user-assisted optimization.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. In some examples, a user equipment (UE) may receive, from a network node, a paging message indicating information for communication between the network node and the UE. In some examples, the UE may receive, from a network node, a downlink alert message indicating a paging message for subsequent transmission to the UE. The UE may identify a delay based on receiving the paging message or the downlink alert message, a measurement of a communication link satisfying a threshold, or any combination thereof. The UE may establish an uplink connection with the network node based at least in part on an expiration of the delay. The UE may communicate the information using the uplink connection.