Local Call Switching in Multi-MSC Mobile Networks
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Solution Overview
Problem
The challenge of implementing local call local switch in mobile networks is hindered when a Base Station System (BSS) connects with multiple Mobile Switch Centers (MSCs), as neither MSC can accurately judge whether a call is local, leading to unsuccessful local switch attempts.
Innovation Solution
The method involves the calling side MSC and the called side MSC transferring access information to determine if a local switch can be triggered, including location and bearer circuit information, and informing the BSS to implement the local switch if conditions are met, thereby enabling the BSS to associate and loop voice bearers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a BSS connects with multiple MSCs to provide service coverage, then the service coverage and user accessibility are improved, but the ability to accurately judge whether a call is local deteriorates, leading to unsuccessful local switch attempts
Solution Approach 1:
The patent introduces an intermediary mechanism (access information transfer protocol between MSCs) that allows MSCs to share location data. When MSC1 receives a call setup request, it queries MSC2 for the called user's access information, enabling accurate local call judgment even when users are served by different MSCs. This intermediary information exchange resolves the contradiction by providing the missing location context without requiring users to be served by a single MSC.
Solution Approach 2:
The patent makes the MSC system universally capable of handling both local and roaming calls through a unified approach. By implementing a standardized access information transfer mechanism, any MSC can determine whether a call is local or roaming regardless of which MSCs the calling and called users are connected to. This multi-functional capability allows the system to maintain accurate local call judgment across multiple MSC connections.
2Loss of energy
If local switch is implemented to save transmission resources, then the transmission resource efficiency is improved, but the system complexity increases due to the need for accurate local call judgment across multiple MSCs
Solution Approach 1:
The patent applies preliminary action by having MSCs exchange access information (including location data) during the call setup phase, before the actual call traffic flows. This advance preparation allows the BSS to receive a definitive local/roaming determination early in the signaling process, enabling resource optimization decisions to be made before substantial transmission resources are consumed. The access information transfer happens proactively during setup, not reactively during call execution.
Solution Approach 2:
The patent implements a feedback mechanism where the BSS receives determination results from MSCs about whether a call is local or roaming, and uses this feedback to adjust its switching behavior. The BSS queries the MSC for local call determination, receives the result, and then either implements local switching or routes through the core network accordingly. This feedback loop enables automated, complexity-reduced decision-making at the BSS level based on MSC-provided information.
Data Source
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AI summary
The present invention provides a method for implementing local call local switch, including: a calling side MSC receiving a call setup request from a calling user, the calling side MSC and a called side MSC mutually transferring the access information of the calling user and the called user; the calling side MSC or the called side MSC judging whether a local switch can be triggered according to the access information of the opposite end user; when judging that a local switch can be triggered, the calling side MSC or the called side MSC informing BSS to implement the local switch. The present invention further provides a system for implementing local call local switch, which includes a MSC and a BSS, to provide the support to implementing local call local switch. The method and system for implementing local call local switch provided in the present invention judge a local call through the MSC, and then inform the BSS to implement a local switch, and solve the problem of an unsuccessful local switch which is caused by BSS connecting with multiple MSCs.