Light Connected Mode for 5G IoT Signaling Overhead Reduction
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Solution Overview
Problem
Current mobile communication systems face inefficiencies in terminal operation modes, particularly in reducing signaling overhead during handover and paging procedures, and in supporting IoT applications, where existing modes do not effectively facilitate light connection, asynchronous HARQ, and efficient reconnection in varying network conditions.
Innovation Solution
The introduction of a light connected mode as a new terminal operation mode, enabling efficient resume ID usage for fast reconnection, semi-persistent scheduling for V2V communication, and asynchronous Hybrid Repeat Request (HARQ) mode in 5G communication systems, along with base station-controlled LTE-WLAN interworking and NarrowBand IoT (NB-IoT) technologies to manage resource allocation and context transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a terminal frequently transitions between idle and connected modes, then the terminal can maintain up-to-date network information, but signaling overhead increases due to repeated handover and paging procedures
Solution Approach 1:
The base station performs preliminary actions by storing the terminal's context information and sending a paging message before the terminal actually needs to reconnect. This allows the terminal to quickly resume communication without going through full connection establishment procedures, reducing signaling overhead while maintaining network information updates.
Solution Approach 2:
The system dynamically manages terminal states by introducing a light connected mode that allows terminals to maintain partial connectivity. The base station can selectively store and retrieve terminal contexts based on activity patterns, optimizing the balance between information freshness and signaling reduction in real-time.
2Use of energy by moving object
If a terminal enters idle mode to conserve energy, then power consumption decreases, but reconnection speed to the network slows down
Solution Approach 1:
The base station performs preliminary actions by pre-storing terminal context information when the terminal is still active. When the terminal needs to reconnect from idle mode, the base station already has the necessary context ready, enabling fast reconnection without requiring the terminal to consume extra energy for context retrieval procedures.
Solution Approach 2:
The base station creates a copy of the terminal's context information and stores it locally. This copy allows the terminal to quickly resume communication from idle mode without needing to retrieve full context from remote servers, significantly reducing reconnection time while the terminal remains in low-power idle state.
3Productivity
If the base station stores terminal context information, then reconnection efficiency improves, but base station memory requirements and complexity increase
Solution Approach 1:
The base station implements local quality by selectively storing terminal context information based on specific criteria such as terminal activity patterns, service requirements, and base station capacity. Not all terminals receive the same level of context storage, allowing the base station to optimize memory usage and complexity while maintaining high reconnection efficiency for prioritized terminals.
4Reliability
If the system uses traditional connected mode for all terminal operations, then network control and monitoring are maximized, but signaling overhead and network load increase
Solution Approach 1:
The system segments terminal operation modes into traditional connected mode and light connected mode. In light connected mode, only essential context information is maintained at the base station, allowing reduced signaling overhead for specific operations while full connected mode remains available for operations requiring comprehensive network control. This segmentation allows the system to optimize for each operational scenario.
Solution Approach 2:
The light connected mode implements partial action by maintaining only the necessary minimum context information at the base station rather than full connection state. This partial maintenance of connectivity allows the system to reduce signaling overhead for routine operations while still providing adequate network control, reserving full connected mode for operations requiring complete monitoring and control.
Data Source
AI summary
The present disclosure relates to a communication technology and system for integrating a 5G communication system with IoT technologies to achieve a data rate higher than those of 4G systems. The present disclosure is applicable to intelligent services based on the 5G communication technologies and IoT technologies (e.g., smart home, smart building, smart city, smart car or connected car, health care, digital education, retail business, and security and safety services). The present disclosure proposes a method for supporting a light connected mode as a new terminal operation mode in addition to the idle mode and connected mode to facilitate operations of the terminals and base stations in a mobile communication system.