Handover Access Control for SIPTO and LIPA Bearer Optimization
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Solution Overview
Problem
Existing handover procedures in wireless communication technologies, such as SIPTO and LIPA, often result in failed handovers due to insufficient access control, leading to wasted signaling and wireless resources, and may not ensure optimal bearers post-handover, affecting Quality of Service (QoS).
Innovation Solution
Incorporating an access control determination procedure before updating wireless bearer information, where the target core network node checks if the bearer supporting SIPTO or LIPA services is permitted to handover, and if not, notifies handover failure or deactivates the bearer to prevent resource wastage and ensure optimal bearer establishment post-handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the target core network node updates the wireless bearer information according to the target base station without access control verification, then the handover procedure is simple and fast, but the handover may fail when the target base station is not allowed to access the local gateway, causing wasted signaling and wireless resources
Solution Approach 1:
The patent applies preliminary action by performing access control verification before updating the wireless bearer information. The target core network node checks whether the target base station is allowed to access the local gateway through the user plane before committing to the handover. This preliminary check prevents failed handovers and waste of signaling resources, while maintaining a relatively simple overall procedure structure.
2Reliability
If the target core network node updates the wireless bearer information without checking access control permissions, then the handover execution is fast, but the Quality of Service may be degraded due to suboptimal bearer establishment
Solution Approach 1:
The patent performs the access control check as a preliminary action before finalizing the bearer establishment. The target core network node determines whether the target base station has permission to access the local gateway through the user plane before updating the wireless bearer information. This ensures optimal bearer establishment for QoS while the check is integrated into the existing handover timing to minimize additional delay.
3Loss of energy
If the handover procedure includes access control verification before updating bearer information, then resource wastage is reduced, but the handover procedure becomes more complex
Solution Approach 1:
The patent integrates the access control verification as a preliminary step within the existing handover procedure flow. The target core network node checks the access control permissions before updating wireless bearer information, which prevents unnecessary signaling exchanges and resource allocation for failed handovers. The verification is performed using existing signaling messages, minimizing the increase in procedural complexity while effectively reducing signaling resource wastage.
4Productivity
If the handover is performed without verifying bearer permissions, then the handover can be executed quickly, but the bearer establishment may be suboptimal affecting service quality
Solution Approach 1:
The patent performs the bearer permission verification as a preliminary action that is integrated into the handover execution flow. The target core network node checks whether the target base station is permitted to access the local gateway through the user plane before finalizing the bearer establishment. This approach maintains fast handover execution by using efficient verification methods while ensuring optimal bearer establishment for service quality.
Data Source
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AI summary
A handover method for supporting terminal mobility is provided. Before a target core network node updates bearer information according to a target base station to which a User Equipment (UE) performs the handover, an access control determination procedure is added. According to the access control determination information provided by the target base station, if it is determined that the bearer supporting a Selected Internet Protocol (IP) Traffic Offload (SIPTO) or Local IP Access (LIPA) service is permitted to perform the handover, the target core network node updates the bearer information. If it is determined that the bearer supporting the SIPTO or LIPA service is not allowed to perform the handover, the handover failure is notified with respect to the bearer not allowed to perform the handover, and the bearer information is not updated, thus the wasted signaling resource and wireless resource are reduced. Alternatively, during the handover to the target network by the UE or after the handover to the target network, the bearer release or deactivation is performed for the bearer not allowed to perform the handover, so that the UE can re-initiate the bearer establishment process with respect to the bearer not allowed to perform the handover, thus an optimized bearer is established and the Quality of Service (QoS) is ensured.