GARP Message Handover Optimization in LTE Networks
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Solution Overview
Problem
Existing LTE communication networks experience communication breaks during handover procedures of mobile terminals from one radio site to another, leading to unnecessary processing loads and potential disruptions in service.
Innovation Solution
A method that optimizes the handover procedure by transmitting the GARP message after the initialization step and relocation information exchanges, ensuring seamless connectivity maintenance by re-establishing logical connections between the PDN-GW gateway and the mobile terminal, thereby minimizing connection outage time and allowing for clean rollback in case of failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the GARP message is transmitted early during handover procedure, then connectivity is established faster, but connection outage time increases and reliability decreases due to potential failures
Solution Approach 1:
The patent applies preliminary action by transmitting the GARP message after the handover preparation is complete but before the handover is fully executed. The target base station prepares the connectivity environment in advance by sending the GARP message to announce the mobile terminal's IP address to the PDN network, so that when the handover completes, connectivity is already established without interruption.
Solution Approach 2:
The patent implements beforehand cushioning by establishing a rollback mechanism. If the handover fails after the GARP message has been transmitted, the system can roll back to the source base station without affecting the PDN network, as the GARP message will be superseded by a new one from the source station during the rollback procedure.
2Loss of time
If the GARP message is transmitted after handover preparation, then connection outage time is minimized, but processing load on network nodes increases
Solution Approach 1:
The patent extracts the GARP message transmission from the traditional handover signaling path and places it in the data plane between the target base station and the PDN network. This separates the connectivity announcement function from the control plane signaling, reducing the processing burden on core network nodes like the MME while maintaining fast handover.
3Adaptability or versatility
If standard LTE handover procedure is followed, then protocol compatibility is maintained, but traffic interruption occurs during handover
Solution Approach 1:
The patent introduces the GARP message as an intermediary mechanism between the LTE handover procedure and the PDN network. This message acts as a mediator that announces the mobile terminal's presence and IP address to the PDN network, enabling seamless connectivity transition without requiring changes to the core LTE protocol stack.
Data Source
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AI summary
Method for optimizing the procedure for transferring or handover of a mobile terminal of a first radio site to a second radio site in a decentralized network comprising several radio sites (101s, 101f) to which the mobile user T may be affiliated, the radio sites being linked together by means of a connection network R, in which the message GARP (219) allowing the maintaining of the connectivity of the mobile terminal T with the connection network R when the mobile terminal changes from the first radio site to the second radio site is transmitted during the "handover" procedure, after the step of initialization of entry of the user into the network and after the handover preparation procedure.