Heterogeneous Wireless Handover via Pre-Set Context
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Solution Overview
Problem
Current handover processes between heterogeneous wireless communication networks, such as from Wi-Fi to LTE, result in significant packet delay, failing to meet the requirements of services like real-time gaming and remote medical applications that demand lower latency.
Innovation Solution
Implementing a method where a terminal monitors signal intensity and pre-sets the context for data flows before handover, allowing for efficient data bearer setup and reduced NAS message transmission time by reporting changes in wireless communication conditions to the network controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional handover process is used between heterogeneous wireless networks, then network connection is established, but packet delay increases significantly
Solution Approach 1:
The patent applies preliminary action by pre-establishing context information for data flows before the actual handover occurs. The terminal monitors signal intensity and triggers context setup in advance, allowing the network controller to prepare data bearer configurations before the handover moment, thereby reducing packet delay while maintaining connection reliability.
2Productivity
If data bearer setup is performed during handover, then data transmission is enabled, but handover processing time increases
Solution Approach 1:
The patent implements preliminary action by triggering data bearer setup procedures in advance based on predicted handover conditions. The terminal monitors signal intensity thresholds and initiates context information exchange with the network controller before actual handover occurs, enabling data transmission to be ready without increasing processing time.
Solution Approach 2:
The patent employs feedback mechanisms where the terminal continuously monitors signal intensity and reports changes to the network controller. This feedback loop enables dynamic adjustment of handover timing and context setup, optimizing the balance between data transmission readiness and processing time.
3Loss of information
If NAS message transmission is used for handover, then context information is exchanged, but transmission time increases
Solution Approach 1:
The patent applies preliminary action by exchanging context information through NAS messages in advance of the actual handover event. The terminal and network controller establish necessary information exchange before handover occurs, reducing the transmission time required during the handover process itself while ensuring complete information transfer.
Data Source
AI summary
The present invention relates to a handover method between heterogeneous wireless communication techniques and a device for same. A wireless access device is capable of: transmitting to a terminal condition information related to conditions required for the terminal to carry out a predetermined reporting action; establishing wireless connection with the terminal, when a request from the terminal due to the reporting action has been received; providing to a network controller of a core network a message according to the reporting action; receiving from the network controller context information of the terminal for establishing security and data bearers; establishing a data bearer for each data flow to be handed over by using the context information, when a request for data transmission/reception according to the handover has been received from the terminal; and receiving data from the terminal.