Network interworking system and method for providing seamless voice service and short message service between wireless communication networks, and packet switch apparatus therefor

A network interworking system for connecting a voice call from a calling terminal in a mobile communication network that provides circuit-switched voice service to a called terminal in a wireless packet network that provides voice over Internet protocol (VoIP) service, the system comprising:

• a home location register (HLR) for registering therein location information of terminals and a subscriber profile;
• a mobile switching center (MSC) for transmitting a call connection request to a location of the called terminal, wherein the called terminal is detected through the HLR, upon receiving an origination message including a terminal identifier of the called terminal;
• a base station system (BSS) for receiving the origination message from the calling terminal in the mobile communication network and delivering the origination message to the MSC;
• a packet switch for transmitting a request message for voice call connection to the called terminal upon receiving a call connection request for the called terminal from the MSC;
• and
• an access network for receiving the request message from the packet switch in the wireless packet network and delivering the request message to the called terminal.

A network interworking method for connecting a voice call from a calling terminal in a wireless packet network that provides voice over Internet protocol (VoIP) service to a called terminal in a mobile communication network that provides circuit-switched voice service, the method comprising the steps of:

• registering location information of terminals and a subscriber profile in a home location register (HLR);
• transmitting an origination message including a terminal identifier of the called terminal to a packet switch in the wireless packet network;
• transmitting, by the packet switch, a call connection request to a location of the called terminal, wherein the called terminal is detected through the HLR based on the terminal identifier, upon receiving the origination message;
• and
• upon receiving the call connection request for the called terminal, transmitting a paging message for voice call connection to the called terminal by a mobile switching center (MSC) in the mobile communication network.

A network interworking method for connecting a voice call from a calling terminal in a mobile communication network that provides circuit-switched voice service to a called terminal in a wireless packet network that provides voice over Internet protocol (VoIP) service, the method comprising the steps of:

• registering location information of terminals and a subscriber profile in a home location register (HLR);
• transmitting an origination message including a terminal identifier of the called terminal to a mobile switching center (MSC) in the mobile communication network;
• transmitting a call connection request to a location of the called terminal, wherein the called terminal is detected through the HLR based on the terminal identifier;
• and
• upon receiving the call connection request for the called terminal, transmitting a request message for voice call connection to the called terminal by the packet switch in the wireless packet network.

A network interworking system for connecting a voice call from a calling terminal in a first wireless packet network that provides voice over Internet protocol (VoIP) service to a called terminal in a second wireless packet network that provides circuit-switched voice service, the system comprising:

• a home location register (HLR) for registering therein location information of terminals and a subscriber profile;
• a first packet switch in the first wireless packet network for transmitting a call connection request to a location of the called terminal, wherein the called terminal is detected through the HLR, upon receiving an origination message including a terminal identifier of the called terminal;
• a first access network for receiving the origination message from the calling terminal and delivering the received origination message to the first packet switch;
• a second packet switch in the second wireless packet network for transmitting a request message for voice call connection to the called terminal upon receiving a call connection request for the called terminal from the first packet switch;
• and
• a second access network for transmitting the request message from the second packet switch to the called terminal.

A network interworking method for connecting a voice call from a calling terminal in a first wireless packet network that provides voice over Internet protocol (VoIP) service to a called terminal in a second wireless packet network that provides circuit-switched voice service, the method comprising the steps of:

• registering location information of terminals and a subscriber profile in a home location register (HLR);
• transmitting an origination message including a terminal identifier of the called terminal to a first packet switch in the first wireless packet network;
• transmitting, by the first packet switch, a call connection request to a location of the called terminal, wherein the called terminal is detected through the HLR based on the terminal identifier, upon receiving the origination message;
• and
• upon receiving the call connection request for the called terminal, transmitting a request message for voice call connection to the called terminal by a second packet switch in the second wireless packet network.

A location registration method for a mobile terminal in a network interworking system including a packet switch, the method comprising the steps of:

• transmitting, by the mobile terminal, a session initiation protocol (SIP) registration request message including its own terminal identifier and electronic serial number (ESN) to the packet switch;
• transmitting, by the packet switch, a location registration request message including the terminal identifier and the ESN to a home location register (HLR) shared by a mobile communication network and a wireless packet network;
• determining, by the HLR, whether the mobile terminal is a registered terminal by analyzing the terminal identifier and the ESN and transmitting a location registration response message including the corresponding subscriber profile to the packet switch if the mobile terminal is a registered terminal;
• and
• registering, by the packet switch, a location of the mobile terminal in a visitor location register (VLR) based on the subscriber profile.

A network interworking system for providing short message service (SMS) service from a calling terminal in a wireless packet network to a called terminal in a circuit-switched mobile communication network, the system comprising:

• a home location register (HLR) for registering therein location information of terminals and a subscriber profile;
• a packet switch for, if an SMS message and an origination message including a terminal identifier of the called terminal are received from the calling terminal, transmitting a first delivery message including the SMS message and the terminal identifier;
• an SMS center (SMSC) for, upon receiving the first delivery message, transmitting a second delivery message including the SMS message and the terminal identifier to a location of the called terminal, wherein the called terminal is detected through the HLR;
• and
• a mobile switching center (MSC) for, upon receiving the second delivery message, transmitting a paging message indicating arrival of the SMS message to the called terminal.

A network interworking system for providing short message service (SMS) service from a calling terminal in a circuit-switched mobile communication network to a called terminal in a wireless packet network, the system comprising:

• a home location register (HLR) for registering therein location information of terminals and a subscriber profile;
• a mobile switching center (MSC) for, if an SMS message and an origination message including a terminal identifier of the called terminal are received from the calling terminal, transmitting a first delivery message including the SMS message and the terminal identifier;
• an SMS center (SMSC) for, upon receiving the first delivery message, transmitting a second delivery message including the SMS message and the terminal identifier to a location of the called terminal, wherein the called terminal is detected through the HLR;
• and
• a packet switch for, upon receiving the second delivery message, transmitting a request message indicating arrival of the SMS message to the called terminal.

A network interworking system for providing short message service (SMS) service from a calling terminal in a first wireless packet network to a called terminal in a second wireless packet network, the system comprising:

• a home location register (HLR) for registering therein location information of terminals and a subscriber profile;
• a first packet switch for, if an SMS message and an origination message including a terminal identifier of the called terminal are received from the calling terminal, transmitting a first delivery message including the SMS message and the terminal identifier;
• an SMS center (SMSC) for, upon receiving the first delivery message, transmitting a second delivery message including the SMS message and the terminal identifier to a location of the called terminal, wherein the called terminal is detected through the HLR;
• and
• a second packet switch for, upon receiving the second delivery message from the SMSC, transmitting a request message indicating arrival of the SMS message to the called terminal.

A network interworking method for providing short message service (SMS) service from a calling terminal in a wireless packet network to a called terminal in a circuit-switched mobile communication network, the method comprising the steps of:

• registering location information of terminals and a subscriber profile in a home location register (HLR);
• transmitting an origination message including an SMS message of the calling terminal and a terminal identifier of the called terminal to a packet switch in the wireless packet network;
• transmitting, by the packet switch, a first delivery message including the SMS message and the terminal identifier to an SMS center (SMSC) upon receiving the origination message;
• transmitting, by the SMSC, a second delivery message including the SMS message and the terminal identifier to a location of the called terminal, wherein the called terminal is detected through the HLR based on the terminal identifier, upon receiving the first delivery message;
• and
• transmitting, by the MSC, a paging message indicating arrival of the SMS message to the called terminal upon receiving the second delivery message.

A network interworking method for providing short message service (SMS) service from a calling terminal in a circuit-switched mobile communication network to a called terminal in a wireless packet network, the method comprising the steps of:

• registering location information of terminals and a subscriber profile in a home location register (HLR);
• transmitting an origination message including an SMS message of the calling terminal and a terminal identifier of the called terminal to a mobile switching center (MSC) in the mobile communication network;
• transmitting, by the MSC, a first delivery message including the SMS message and the terminal identifier to an SMS center (SMSC) upon receiving the origination message;
• transmitting, by the SMSC, a second delivery message including the SMS message and the terminal identifier to a location of the called terminal, wherein the called terminal is detected through the HLR based on the terminal identifier, upon receiving the first delivery message;
• and
• transmitting, by a packet switch, a request message indicating arrival of the SMS message to the called terminal upon receiving the second delivery message.

A network interworking method for providing short message service (SMS) service from a calling terminal in a first wireless packet network to a called terminal in a second wireless packet network, the method comprising the steps of:

• registering location information of terminals and a subscriber profile in a home location register (HLR);
• transmitting an origination message including an SMS message of the calling terminal and a terminal identifier of the called terminal to a first packet switch in the first wireless packet network;
• transmitting, by the first packet switch, a first delivery message including the SMS message and the terminal identifier to an SMS center (SMSC) upon receiving the origination message;
• transmitting, by the SMSC, a second delivery message including the SMS message and the terminal identifier to a location of the called terminal, wherein the called terminal is detected through the HLR, upon receiving the first delivery message;
• and
• transmitting, by a second packet switch in the second wireless packet network, a request message indicating arrival of the SMS message to the called terminal upon receiving the second delivery message.