US 8,014,773 B2Granted

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

AssigneeSK Telecom Co., Ltd.

InventorsJae Young Ju, Sang-Yun Lee, Hee-Hyeok Hahm, Soo Jin Kim, Bum-Soo Shin, Kyeong-Hee Han, Young-Ho Ju, Hyun Ki Hong, Young Ahn Ryu

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Abstract

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.

Claims23

Dependent claims

A mobile communication system in which an asynchronous mobile communication system coexist with a synchronous mobile communication system, the asynchronous mobile communication system including a node B, a radio network controller (RNC) and an asynchronous Mobile Switching Center (MSC), and the synchronous mobile communication system including a Base Transceiver Station (BTS), a Base Station Controller (BSC) and a synchronous MSC, the mobile communication system enabling handover of a Dual Band Dual Mode (DBDM) mobile communication terminal and capable of communicating with the asynchronous and synchronous mobile communication systems, during voice communication, reception alerting, or waiting for a response after origination of a call, wherein:

the asynchronous and synchronous MSCs are connected to each other via an Interworking Interoperability Function (IIF), and are connected to a Dual stack Home Location Register (D-HLR);
the D-HLR configured to store and manage asynchronous subscription information and synchronous subscription information of the mobile communication terminal;
and
the IIF configured to store and manage synchronous mobile communication system information, receive the synchronous subscription information of the mobile communication terminal from the D-HLR at a request of the asynchronous MSC for handover, transmit the synchronous mobile communication system information and the synchronous subscription information of the mobile communication terminal to the synchronous MSC and receive a response from the synchronous MSC, thereby setting up a relay line between the asynchronous MSC and the synchronous MSC, and request the asynchronous MSC to release a wireless connection when the mobile communication terminal and the synchronous mobile communication system are connected to each other and notification of completion of the handover is provided by the synchronous MSC.

1 more element

A handover method for performing handover of a DBDM mobile communication terminal, capable of communicating with asynchronous and synchronous mobile communication systems, during voice communication, or reception alerting, or while waiting for a response after origination of a call in a mobile communication system in which the asynchronous mobile communication system coexist with the synchronous mobile communication system, the asynchronous mobile communication system including a node B, a radio network controller (RNC) and an asynchronous MSC, and the synchronous mobile communication system including a BTS, a BSC, and a synchronous MSC, the asynchronous and synchronous MSCs being connected to each other via an IIF, the asynchronous and synchronous MSCs being connected to a D-HLR, the method comprising the steps of:

the RNC transmitting a handover request message to the asynchronous MSC at a request of the mobile communication terminal for handover;
the asynchronous MSC transmitting the handover request message to the IIF;
the IIF requesting and receiving subscriber information of the mobile communication terminal from the D-HLR;
the IIF directing the synchronous MSC to perform the handover, and the synchronous MSC requesting the handover to the BSC/BTS;
the BTS/BSC assigning a forward traffic channel to the mobile communication terminal, and transmitting a response message for the request for the handover to the synchronous MSC;
the synchronous MSC transmitting a response message for a handover direction message to the IIF, and the IIF transmitting a response message for the handover request to the asynchronous MSC, thereby setting up a relay line between the asynchronous MSC and the synchronous MSC;
the asynchronous MSC reporting completion of assignment of resources for the handover by transmitting a resource assignment completion message to the RNC;
the RNC directing the mobile communication terminal to perform the handover via the node B;
the mobile communication terminal switching to a mode for connecting to the synchronous mobile communication system;
the IIF transmitting an access signal to the asynchronous MSC;
the mobile communication terminal transmitting frames and a preamble to the BTS/BSC via a reverse traffic channel and reporting completion of the handover to the BTS/BSC;
the BTS/BSC reporting the completion of the handover to the synchronous MSC, the synchronous MSC notifying the IIF of the completion of the handover;
and
the IIF requesting the asynchronous MSC to release a connection, and the connection between the asynchronous MSC and the node B/RNC being released.

11 more elements

Dependencies are inferred from the claim text.