Non-Terrestrial Network TAC Signaling for Selective Updates
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing power consumption and signaling overhead, particularly in scenarios involving cell movements and tracking area code changes, which can lead to unnecessary system information updates and increased power consumption.
Innovation Solution
A base station is equipped with a transceiver and circuitry that controls the transmission of a TAC indicator and a trigger indicator, preventing unnecessary system information updates when a cell moves to a new tracking area code, thereby optimizing power usage and reducing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station transmits a trigger indicator whenever system information changes (including TAC changes due to cell movement), then the system information update procedure is reliably triggered, but unnecessary power consumption and signaling overhead increase
Solution Approach 1:
The patent introduces a new parameter (trigger indicator) that changes state based on the type of system information update. When TAC changes occur due to cell movement, the trigger indicator is suppressed or set to a specific value, allowing the UE to distinguish between genuine system information changes requiring updates and routine TAC changes due to mobility. This parameter differentiation resolves the contradiction by enabling selective triggering.
2Reliability
If the base station transmits a trigger indicator whenever system information changes (including TAC changes due to cell movement), then the system information update procedure is reliably triggered, but signaling overhead increases
Solution Approach 1:
The patent modifies the trigger indicator parameter to encode different types of system information changes. By setting the trigger indicator to specific values or suppressing its transmission based on whether the change is due to cell movement or genuine system information modification, the signaling overhead is reduced while maintaining reliability for actual updates.
3Reliability
If the base station periodically transmits TAC indicator in system information, then the TAC information is reliably provided to UEs, but signaling overhead increases
Solution Approach 1:
The patent implements periodic transmission of TAC indicator in system information, allowing UEs to acquire TAC information at regular intervals without requiring continuous broadcasting. This periodic action reduces signaling overhead compared to continuous transmission while maintaining reliability for mobile UEs that can track changes over time.
Solution Approach 2:
The TAC indicator is transmitted as a specific parameter within the system information framework, allowing efficient encoding and periodic updates. By changing only the TAC parameter when necessary rather than retransmitting entire system information messages, signaling overhead is minimized while maintaining information reliability.
Data Source
AI summary
The present disclosure provides a base station, comprising a transceiver; and circuitry which, in operation, controls the transceiver to serve a cell associated with a first tracking area code, TAC, periodically transmit, in system information, a TAC indicator indicating at least one TAC associated with the cell, and transmit a trigger indicator for triggering a transceiver device to perform a system information update procedure when a content of the system information changes, wherein the circuitry, in operation, prevents the transceiver from transmitting the trigger indicator in a case where the cell is being associated with a second TAC due to a movement of the cell.