Radio Link Setup Signaling With Validity Windows
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Solution Overview
Problem
In cellular communication systems, especially in mobile environments, existing technologies face challenges in seamlessly maintaining radio links due to the mobility of terminal devices and access nodes, leading to potential radio link failures.
Innovation Solution
A method where a network node selects candidate cells for link setup, determines a validity window based on mobility parameters, and transmits this information to the terminal device, allowing it to initiate link setup within the defined time frame, thereby reducing the likelihood of radio link failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radio link setup is performed in mobile environments without validity window information, then terminal devices can attempt link setup at any time, but radio link failures occur due to mobility of terminal devices and access nodes
Solution Approach 1:
The network node performs preliminary actions by determining the validity window for candidate cells before the terminal device attempts link setup. The network node calculates when the terminal device will be in coverage of candidate cells based on mobility information, and prepares the validity window information in advance. This preliminary determination of the validity window ensures that the terminal device only attempts link setup when the candidate cell will be valid, preventing radio link failures due to mobility.
2Reliability
If terminal devices select candidate cells without validity window information, then cell selection is simple, but link setup fails when the selected cell is no longer valid due to mobility
Solution Approach 1:
The network node acts as an intermediary that determines the validity window for candidate cells on behalf of the terminal device. Instead of requiring the terminal device to perform complex calculations involving mobility information, coverage area predictions, and timing synchronizations, the network node computes these parameters using its superior position knowledge and mobility data, then provides the simplified validity window information to the terminal device. This intermediary approach maintains terminal device simplicity while achieving reliable link setup.
3Loss of time
If the network node provides candidate cell information without validity window, then signaling is minimal, but the terminal device cannot determine when to initiate link setup successfully
Solution Approach 1:
The network node extracts the essential timing information from complex mobility calculations and coverage predictions, isolating only the critical validity window parameter that the terminal device needs. Instead of transmitting detailed mobility data, coverage area calculations, or timing synchronization information, the network node extracts and transmits only the pre-calculated validity window, which contains all necessary timing information for successful link setup initiation.
Data Source
AI summary
This document discloses a solution for providing a terminal device with one or more candidate cells for link setup. A network node providing the candidate cell(s) may compute a validity window for each candidate cell and indicate the validity window(s) to the terminal device. The terminal device may then perform the link setup with a candidate cell within the respective validity window of the candidate cell.