NTN Cell Reselection Delay in RRC Idle Mode
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in power consumption and reselection processes for CIoT devices connected to non-terrestrial network (NTN) cells, particularly when transitioning to Radio Resource Control (RRC) Idle mode, leading to repeated cycles of cell reselection and increased power consumption due to radio link failure procedures.
Innovation Solution
A method involving a core network node transmitting a signaling release message with additional fields to prevent re-selection of an NTN cell for a specific time, including NTN cell information to avoid and a timer, allowing the wireless terminal to skip reselecting the previous cell and transition to RRC_IDLE mode before discontinuous coverage, thereby reducing power consumption and avoiding repeated radio link failure procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless terminal performs cell reselection procedures after transitioning to RRC_IDLE mode, then the terminal can potentially reconnect to available cells, but this causes repeated cycles of radio link failure procedures and increases power consumption
Solution Approach 1:
The core network node performs preliminary action by transmitting a signaling release message before the NTN cell actually enters discontinuous coverage. This message includes NTN cell information to avoid and a timer value, preventing the wireless terminal from performing unnecessary cell reselection procedures that would lead to repeated radio link failure cycles and increased power consumption.
2Duration of action of stationary object
If the wireless terminal waits for discontinuous coverage to occur before transitioning to RRC_IDLE mode, then the terminal can maintain connection longer, but this causes repeated cycles of cell reselection and radio link failure procedures
Solution Approach 1:
The core network node transmits the signaling release message in advance, before discontinuous coverage actually occurs. This preliminary action allows the wireless terminal to transition to RRC_IDLE mode proactively, avoiding the time loss associated with waiting for coverage changes and preventing repeated cell reselection cycles.
Solution Approach 2:
The core network node provides feedback to the wireless terminal through the signaling release message, which includes NTN cell information to avoid and a timer value. This feedback mechanism enables the terminal to understand why it should avoid reselecting the NTN cell and how long to wait before attempting reconnection, optimizing the balance between connection duration and time loss.
3Loss of time
If the core network node releases connection immediately, then the wireless terminal can transition to RRC_IDLE mode quickly, but this may cause the terminal to reconnect to NTN cells that will soon enter discontinuous coverage
Solution Approach 1:
The core network node performs preliminary action by including NTN cell information to avoid and a timer value in the signaling release message. This allows the terminal to transition quickly to RRC_IDLE mode while simultaneously being guided to avoid reconnecting to NTN cells that will soon enter discontinuous coverage, balancing transition speed with connection stability.
Solution Approach 2:
The core network node provides feedback through the signaling release message, informing the terminal which NTN cells to avoid and for how long (via the timer value). This feedback mechanism prevents the terminal from reconnecting to cells that will soon become unavailable, ensuring connection stability while maintaining quick transition to idle mode.
Data Source
AI summary
A wireless terminal is described. The wireless terminal includes receiving circuitry configured to receive a signaling release message from a core network node. The wireless terminal delays re-selection of a non-terrestrial network (NTN) cell for a specific amount of time.