LTE Handover Location Reporting via Source eNB Forwarding
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Solution Overview
Problem
In the LTE system, the target eNB often fails to receive location reporting control messages from the MME, resulting in the inability to report location information of UE after handover to another serving cell, leading to incomplete location reporting.
Innovation Solution
The source eNB initiates a handover procedure and sends location reporting information to the target eNB via a handover request message, ensuring the target eNB acquires and reports the UE's location information to the MME through a path switch request, using the X2 or S1 interface, or during handovers from GERAN/UTRAN to LTE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MME sends location reporting control messages to eNB to query current location information of UE, then the MME can obtain location information of UE, but the target eNB does not receive the location reporting control message after handover, resulting in inability to report location information
Solution Approach 1:
The source eNB stores location reporting control information received from the MME before handover occurs. When initiating handover to the target eNB, the source eNB includes this stored location reporting control information in the handover request message, ensuring the target eNB receives it in advance and can perform location reporting without needing to receive a separate control message from the MME after handover.
Solution Approach 2:
The source eNB acts as an intermediary that receives location reporting control information from the MME and forwards it to the target eNB through the handover request message. This intermediary role ensures the location reporting control information is successfully transmitted to the target eNB even though the target eNB does not directly receive control messages from the MME during handover.
2Productivity
If the MME initiates a dedicated location reporting procedure by sending location reporting control messages, then location information can be reported, but the procedure is incomplete and cannot achieve reporting after handover
Solution Approach 1:
The location reporting control information is merged with the handover request message. Instead of being a separate control message that the target eNB would need to receive independently, the location reporting control information is combined into the handover request message, ensuring it is delivered to the target eNB as part of the handover procedure.
3Reliability
If the target eNB is expected to report location information after handover, then complete location reporting is achieved, but the target eNB cannot know whether it is necessary to report location information without receiving the control message
Solution Approach 1:
The target eNB receives location reporting control information in advance through the handover request message from the source eNB. This preliminary action allows the target eNB to know beforehand whether it needs to perform location reporting, eliminating the need for additional signaling after handover to convey this information.
Data Source
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AI summary
A method for reporting location information of user is disclosed in the present invention, which is configured for achieving the report of a location information of User Equipment (UE) during the procedure that UE is handed over to another serving cell, and includes the following steps: a source evolved Node B (eNB) initiates a handover procedure; during the handover procedure, the source eNB sends the location reporting information to a target eNB, the target eNB acquires the location information of UE based on the location reporting information and reports it to a Mobility Management Entity (MME) corresponding to the target eNB. According to the present invention, it is possible for the source eNB to notify the target eNB based on a handover request of UE that the target eNB should report the location information after the UE is handed over to another serving cell, so that the target eNB can report the location information of UE to MME during the handover procedure of the serving cells. The present invention simplifies the signalling flow and is simple to be implemented.