MSC Paging Control During WCDMA to LTE Handover
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Solution Overview
Problem
The existing mobile communication systems face delays and failures in paging message processing during handover from a WCDMA network to an LTE network, particularly due to the time required for network switching, which can result in missed or delayed paging responses during inbound calls.
Innovation Solution
The proposed solution involves a paging message processing method where the MSC system determines the existence of an MME system, transmits paging messages over appropriate interfaces, and processes inbound calls by handing over control to the MME system once location registration is complete, ensuring timely delivery of paging responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network switching from LTE to WCDMA is performed using CSFB function, then the UE can handle CS calls, but the network switching takes several seconds causing paging message processing delay
Solution Approach 1:
The MSC system proactively determines whether the UE is in the process of network switching before transmitting paging messages. By checking the switching state in advance and selecting the appropriate transmission path (direct IU interface or via MME), the system avoids paging delays without waiting for the switching to complete
Solution Approach 2:
The MME system acts as an intermediary for paging message transmission when the UE is undergoing network switching. Instead of directly paging the UE through the IU interface (which would be delayed), the MSC sends paging messages through the MME, which can deliver them once the UE completes switching to LTE
2Productivity
If paging message is transmitted over IU interface during network switching, then the paging can be sent directly, but the paging response may be delayed or lost due to ongoing switching
Solution Approach 1:
The system dynamically selects the paging transmission path based on the UE's current state. When network switching is detected, the path changes from direct IU interface transmission to MME-mediated transmission, optimizing both speed and reliability according to real-time conditions
Solution Approach 2:
The system changes the transmission parameter (path selection) based on the switching state parameter. When switching is detected, the transmission path parameter is changed from IU interface to MME route, ensuring reliable delivery while maintaining efficiency
3Reliability
If the UE delays paging response transmission during network switching, then the switching can complete, but the paging response is delayed
Solution Approach 1:
The MME serves as an intermediary that receives and forwards paging messages after the UE completes network switching. This allows the UE to finish switching without delay while ensuring paging messages are delivered through a reliable path once switching is complete
Data Source
AI summary
A paging message processing method is capable of handling paging message processing delay in handover from a Wideband Code Division Multiple Access (WCDMA) network to a Long Term Evolution (LTE) network. A Mobile Switching Center (MSC) includes determines, when an inbound call occurs, whether a Mobility Management Entity (MME) system exists; transmits, when no MME exists, a paging message over an IU interface; determines, when no response message is received, whether a location registration request is received form the MME; transmits, when the location registration request is received, a location registration response to the MME system to deliver the paging message via the MME system; and processes, when a paging response is received, the inbound call. In a heterogeneous network handover from a WCDMA network to an LTE network, the MSC hands over the paging procedure control to the MME immediately so as to facilitate processing the inbound call.