Micro Cell Base Station Emergency Handover Access Control
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Solution Overview
Problem
Existing handover procedures in radio communications fail to successfully transfer a UE's emergency service to a micro cell base station when the UE lacks access permission, leading to handover failures.
Innovation Solution
A method and system that allow a micro cell base station to reject non-emergency services and hand over emergency services to a cell it is located in, even if the UE is not a member of the closed subscriber group, by receiving Handover Request messages without performing access control or after access control fails, ensuring emergency service handover to a micro cell base station with no permission access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If access control is performed on the UE before handover to a closed-mode micro cell base station, then security and access permission are maintained, but emergency service handover fails when the UE is not a member of the CSG
Solution Approach 1:
The patent applies dynamics by making the access control mechanism flexible rather than static. The micro cell base station dynamically adjusts its access control behavior based on the service type: it enforces CSG membership verification for normal services but suspends this verification for emergency services. This dynamic adaptation allows the system to maintain security for regular operations while enabling critical emergency handovers, thereby resolving the contradiction between access control reliability and emergency service accessibility
Solution Approach 2:
The patent changes the access control parameter (CSG verification status) based on the service type parameter. When the service type is identified as emergency service, the system changes the access control parameter from 'verified' to 'suspended', allowing handover without CSG membership verification. This parameter change mechanism enables the system to adapt access control strictness according to service priorities, resolving the contradiction between maintaining access control and enabling emergency handover
2Reliability
If the micro cell base station rejects handover requests from non-member UEs, then closed subscriber group security is maintained, but emergency services cannot be handed over
Solution Approach 1:
The patent makes the handover acceptance mechanism dynamic by introducing service type as a decision variable. The micro cell base station dynamically switches between two modes: rejecting non-member UEs for normal services to maintain CSG security, and accepting non-member UEs for emergency services to ensure adaptability. This dynamic behavior allows the system to simultaneously maintain security and accommodate emergency needs
Solution Approach 2:
The patent changes the handover acceptance parameter based on the service type. For emergency services, the system changes the acceptance parameter from 'reject' to 'accept' regardless of CSG membership status. This parameter change enables the system to maintain CSG security for normal operations while becoming adaptable to emergency service requirements, resolving the contradiction between security and versatility
3Reliability
If the handover procedure follows standard access control protocols, then normal service handover is reliable, but emergency service handover fails due to access permission checks
Solution Approach 1:
The patent segments the handover procedure into two distinct paths: a standard path for normal services that includes full access control verification, and an emergency path that bypasses access control verification. By segmenting the procedure, the system can maintain reliable access control for normal services while enabling rapid emergency handovers without the time loss associated with verification failures
Solution Approach 2:
The patent applies preliminary action by having the micro cell base station identify the service type before completing the access control verification process. When emergency service is detected in the handover request, the system takes preliminary action to suspend access control verification, preventing the time loss that would occur if standard verification procedures were completed. This preliminary identification and suspension mechanism resolves the contradiction between procedural reliability and time efficiency
Data Source
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AI summary
Embodiments of the present invention provide a handover method and apparatus. The method mainly includes: when an access mode of a micro cell base station is a closed mode, receiving, by the micro cell base station, a Handover Request message sent by a core network node of a first domain, where the Handover Request message carries a member state indication of the user equipment indicating a non-member and the user equipment has an emergency service in the first domain; and rejecting, by the micro cell base station, a bearer of a non-emergency service of the user equipment in the first domain, and handing over the emergency service of the user equipment in the first domain to a cell in which the micro cell base station is located. The embodiments of the present invention can ensure that an emergency service of a UE is handed over to a cell of a micro cell base station to which the UE has no permission for accessing.