Base Station Signaling for UAV Flight Data in RRC_INACTIVE
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Solution Overview
Problem
Existing communication methods for unmanned aerial vehicles (UAVs) require transitioning to the RRC_CONNECTED state to transmit flight status information, which involves significant time delays due to the need to transition from RRC_IDLE or RRC_INACTIVE states.
Innovation Solution
A base station and wireless terminal configuration that allows for the transmission of flight-related information in the RRC_INACTIVE state through instruction-based communication, utilizing Small Data Transmission (SDT) to reduce the time required for information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UAV transitions to RRC_CONNECTED state to transmit flight status information, then the information can be transmitted reliably, but the transmission time increases significantly
Solution Approach 1:
The base station performs preliminary action by transmitting instruction information to the UE in RRC_INACTIVE state, enabling the UE to transmit flight status information directly without first transitioning to RRC_CONNECTED state. This preliminary instruction allows the UE to prepare and transmit data in the more efficient RRC_INACTIVE state, thereby reducing transmission time while maintaining reliability through the instructed transmission mechanism.
2Reliability
If the base station waits for UE to transition to RRC_CONNECTED state before receiving flight status information, then the connection is established properly, but the overall response time increases
Solution Approach 1:
The base station transmits instruction information to the UE while it is in RRC_INACTIVE state, performing the action before the UE would naturally transition to RRC_CONNECTED state. This allows the UE to transmit flight status information immediately upon receiving the instruction, eliminating the waiting time for connection establishment and significantly improving response speed while maintaining proper connection management.
Solution Approach 2:
The instruction information acts as an intermediary mechanism that enables the base station to control and trigger the transmission timing. Instead of passively waiting for the UE to transition to RRC_CONNECTED state, the base station actively sends instructions that mediate the transmission process, allowing the UE to transmit data in RRC_INACTIVE state and improving overall response speed.
3Use of energy by moving object
If the UE remains in RRC_INACTIVE state to save power, then energy consumption is reduced, but the ability to transmit information is limited
Solution Approach 1:
The base station performs preliminary action by transmitting instruction information to the UE in RRC_INACTIVE state, enabling the UE to transmit flight status information without transitioning to RRC_CONNECTED state. This allows the UE to maintain the low-power RRC_INACTIVE state while still achieving information transmission capability, thus resolving the contradiction between power saving and transmission productivity.
Data Source
AI summary
An object is to provide a base station capable of reducing a time required for a wireless terminal to transmit information related to a flight status. A base station according to the present disclosure includes: a transmission unit configured to transmit, to at least one wireless terminal, instruction information instructing to transmit flight-related information regarding the wireless terminal in an RRC INACTIVE state; and a reception unit configured to receive, from the wireless terminal that has received the instruction information, the flight-related information in the RRC INACTIVE state.