Sk Telecom Company, Ltd.

Jae-Young Ju

Young-Ho Joo

Hyun-Wook Kim

Young-Lak Kim

Sang-Yun Lee

Hee-Hyeok Hahm

Bum-Soo Shin

Kyeong-Hee Han

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

A method of handover in a wireless communication system in which an asynchronous system and a synchronous system are mixed is disclosed. The method comprises the steps of: the asynchronous system ordering a dual mode mobile terminal to perform a handover from the asynchronous system to the synchronous system; when the handover order is received at the mobile terminal, the mobile terminal transmitting a frame or a preamble through a reverse traffic channel to the synchronous system, reporting to the synchronous system that the handover is completed and initiating a timer of the mobile terminal which is set according to a predetermined time; the mobile terminal switching from an asynchronous vocoder into a synchronous vocoder when the timer expires; and the wireless communication system switching vocoders of asynchronous and synchronous MSCs when the report is received.

Inter-system handover

Growing community of inventors

Gunpo-si, South Korea

Jae-Young Ju