Sk Telecom Company, Ltd.

Bum-Soo Shin

Sang-Yun Lee

Hee-Hyeok Hahm

Kyeong-Hee Han

Jae Young Ju

Young Ahn Ryu

Young-Ho Joo

Hyun Ki Hong

Jae-Young Ju

Soo Jin Kim

Young-Ho Ju

The present invention relates to a method of performing handover from an asynchronous mobile communication network to a synchronous mobile communication network. If the access network of the asynchronous mobile communication network () requests handover to an MSC () of the asynchronous mobile communication network, the MSC requests/receives subscriber information of the mobile communication terminal from a dual-stack HLR (), and transmits a handover request message to the synchronous mobile communication network (). The MSC () of the synchronous mobile communication network assigns a forward channel to the mobile communication terminal. The asynchronous mobile communication network () transmits a handover instruction message to the asynchronous RF device of the mobile communication terminal. Accordingly, the mobile communication terminal sets up a synchronous RF device, connects to the synchronous mobile communication network through reverse channel assignment and synchronization. The mobile communication terminal transmits a handover completion message to the synchronous mobile communication network.

Hand over method from asynchronous mobile communication network to synchronous mobile communication network

In the mobile communication system, asynchronous and synchronous Mobile Switching Centers (MSCs) are interconnected via an Interworking Interoperability Function (IIF), and are connected to a Dual stack Home Location Register (D-HLR). The D-HLR stores and manages asynchronous subscription and synchronous subscription information of the mobile communication terminal. The IIF stores and manages the synchronous mobile communication system information, receives the synchronous subscription information of the mobile communication terminal from the D-HLR, transmits synchronous system information and the synchronous subscription information of the mobile communication terminal to the synchronous MSC and receives a response from the synchronous MSC, and requests the asynchronous MSC to release a wireless connection when the mobile communication terminal and the synchronous mobile communication system are interconnected and notification of completion of the handover is provided.

Mixed mobile communication system of asynchronous communication network and synchronous communication network having handover function of mobile communication terminal, and handover method in the same

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Seoul, South Korea

Bum-Soo Shin