TWI384896B - Mobile video telephony method - Google Patents

Description

Mobile video service method

The present invention is directed to a method for use in a third generation (3G) mobile telephone network that provides mobile video telephony services to inbound second generation (2G) roaming subscribers.

Background of the invention

Video telephony service is a new service in 3G mobile communication, allowing 3G mobile clients to send a video call to another 3G mobile terminal or fixed line video terminal or receive from these terminals. A video call. To enjoy this service, 3G customers should use 3G terminals with videophone performance equipment. In addition, such video telephony services should be subscribed and defined in a user profile with a video service parameter.

For a wideband code division multiple access (WCDMA), the video service parameter is defined as 3GPP TS 22.002. A video call (known in the art as a CS multimedia phone) is a bearer service that utilizes the service parameters, which is known as a synchronous transparent data service (BS30).

3G network routing 2G network evolved, and it allows 3G mobile users with 2G compatible mobile phones to automatically roam into 2G networks, and also allows 2G compatible services, such as voice services and short message services (short messages) Service, SMS). Vice versa, if a roaming connection between the 2G and 3G networks is established and the 2G mobile user is using a 3G compatible terminal, the 2G mobile user can also roam into the 3G network.

However, since the 2G network does not support the video telephony service, in the 2G network, the relevant service parameters for supporting the video telephony service are usually not defined. Therefore, a 2G inbound roaming client cannot update the video service parameter (synchronous transparent data service BS30) in the 3G network during roaming to enjoy the videophone service.

The present subject matter seeks to mitigate or at least alleviate such disadvantages by providing a 3G video telephony method.

Summary of invention

In accordance with the present invention, a method is provided for providing an active video telephony service to a third generation (2G) mobile telephone network for inbound roaming mobile telephone users in a third generation (3G) mobile telephone network, The method comprises the steps of: (a) providing a system server connected to the 3G and 2G networks; (b) the system server obtaining the location of the user in the 3G network; (c) the system server from the 2G A home location register of the network obtains a user profile having a feature list, the list including a 2G mobile phone number of the user; (d) by initiating a video call service and with a 3G The local mobile phone number replaces the 2G mobile phone number, the system server corrects the feature list of the user profile; and (e) the system server updates the user modified profile of the user at a mobile switching center of the 3G network So that the user can place an external video call in the 3G network.

Preferably, step (b) includes the mobile switching center determining the location of the user in the 3G network and then updating the user location at the system server.

More preferably, step (b) includes the subsequent verification of the user identification code by the system server based on the International Mobile Subscriber Identity (IMSI) associated therewith.

More preferably, step (b) includes the subsequent update of the user location by the system server at the home location register.

Preferably, step (d) includes initiating a video telephony service by adding a service parameter to the feature list of the user profile.

More preferably, the service parameter in step (d) is inserted into a Mobile Access Protocol (MAP) message "insert user profile" or is checked from the message, the message is sent from the system server to Action Exchange Center.

Preferably, steps (b) through (e) are performed during the user's roaming into the 3G network.

In a preferred embodiment, the mobile video telephony method comprises the steps of: (f) when there is a video call to the user, the system server sends a query to the user location in the start location register; And (g) the home location register provides the user location to the system server, based on which the system server can obtain a roaming number of the user to transmit the video call.

More preferably, the query in step (f) includes a request for routing information to send a short message service based on the 2G mobile phone number.

More preferably, the user location is included in the address of the mobile switching center.

More preferably, the query for retrieving the address from the home location register in step (f) includes the step of obtaining the user's international mobile subscriber identity from the system server based on the called number of the video call ( IMSI) and 2G mobile phone number; and send a Mobile Access Protocol (MAP) message "Route message to send short messages" to the home location register.

In particular, the system server includes a signaling server for relaying roaming messages, one for collecting relevant information from roaming messages, and signaling parameters for signaling parameters (signaling parameters) Manipulating application logics, simiting the sending of messages to the 2G network for call routing information, and cooperating with 3G networks for video incoming call routing An application server and a database server for storing information on the 2G network.

More specifically, the messaging server supports an SS7 Mobile Access Protocol (MAP) stack (3GPP TS 29.002 compliant) for decoding outgoing messages.

Preferably, the 3G local mobile telephone number in step (d) is specific to a particular International Mobile Subscriber Identity (IMSI) range of the 2G network.

Preferably, the 3G local mobile telephone number in step (d) is replaced with a 2G mobile telephone number in a mobile access protocol (MAP) message "insert user profile" field, the message being updated in step (e) The user profile being corrected.

Simple illustration

The present invention will now be described more specifically by way of example only, and with reference to the accompanying drawings, in which: FIG. 1 is a schematic signal flow diagram illustrating an initial embodiment of an active video telephony method of the present invention. The program; and Figure 2 is a similar schematic signal flow diagram illustrating the subsequent procedure of the mobile video telephony method of Figure 1.

Detailed description of the preferred embodiment

Referring to the drawings, a mobile video telephony method embodying the present invention is provided for providing a 3G video telephony service to a 2G mobile handset user in a visiting location of a 3G WCDMA mobile telephone network. A home location from a 2G GSM mobile phone network. The method can be used by a 3G mobile phone service provider that operates via a set of system servers 10 connected in a general telephone network.

System server 10 includes a number of signaling servers connected between a 3G WCDMA network and one or more roaming partners (ie, 2G GSM networks), typically used for roaming Send a message to start an international roaming service. At least some of the messaging servers support an SS7 MAP protocol (Mobile Access Protocol) stack (3GPP TS 29.002 compliant) for processing or encoding/decoding the messaging messages.

Also included is an application server for collecting relevant information from roaming messaging messages, executing application logic for signaling parameter manipulation, and simiting signaling for call routing information The GSM network, as well as video incoming call routing, operates in conjunction with the WCDMA network. It also includes a database server for storing information on individual 2G GSM networks, including specific users who have signed roaming and video telephony services.

In the 3G network, there is a mobile switching center or MSC 20 for exchange control, including a location location register for keeping the updated roaming user's details, such as its location (visiting location register) Or VLR 21, which is generally known in the art. The 2G network includes a home location register or HLR 30, which typically contains the same user details, as is also generally known in the art.

Figure 1 illustrates the initial roaming procedure of the mobile video telephony method of the present subject in steps 1 through 5.

After a 2G roaming user turns on the power of his 3G compatible mobile phone (step 1), the 3G MSC 20 will detect the new location of the user and then send an updated location (address) message to inform the relevant system server 10, The 2G user wants to roam into the 3G network (step 2). The system server 10 verifies the roaming user's identification code based on the International Mobile Subscriber Identity (IMSI) associated with the user to ensure that it is a signed user and then passes on the updated current. The address (at the VLR 21) is used to inform the 2G HLR 30 to which the user belongs (step 3).

In response to the notification, the 2G HLR 30 will check the user's roaming profile and then send a MAP message "Insert Subscriber Data" to the system server 10 to insert the user's feature list. User profile, which includes its 2G action number and an indication that no video telephony service is available (step 4).

Upon receipt of the user profile, the system server 10 will again verify the ID of the 2G inbound roamer. If the user does not have a video telephony service, and the visiting MSC (VMSC) 20 is associated with a 3G network, the system server 10 will join the video telephony service to the user's feature list and use a local 3G. The action number replaces the user's 2G action number (step 5).

The video telephony service of the WCDMA network is added or activated by defining a BS30 parameter in accordance with 3GPP TS 22.002. The BS 30 parameters are inserted into or checked from the MAP message "Insert Subscriber Data", which is sent from the system server 10 to the MSC 20.

The local 3G mobile number replaces the original 2G mobile number in the MAP message "Insert Subscriber Data" range for the MSC 20. Based on a signing basis, the 3G number is assigned to the GSM inbound roaming subscriber and is specific to the particular IMSI range of the 2G mobile network.

The modified user profile with the feature list is then inserted with another MAP message "Insert Subscriber Data", which includes the 3G action number, which is sent to the MSC 20 and on the MSC 20 It is updated so the user can place an outgoing video call.

After roaming into the 3G network, 2G inbound roaming users can now place an external video call to the network, as a result of the above process, especially by inserting a video telephony service and replacing the 2G mobile number with a local 3G mobile number. Another 3G user in the middle.

At this stage, since the video call is not supported in the 2G network, the incoming video call of the roaming 2G user will fail. The subject video call method solves this problem by querying the 3G roaming number to receive the incoming video call, which is sent to the HLR 30 in a Short Message Service (SMS) manner.

Figure 2 illustrates the subsequent procedures of the subject mobile video telephony method in steps 6 through 13.

In the access location, there is a Gateway Mobile Switching Centre or GMSC 40 for initializing receiving or terminating an incoming video call to the roaming 2G subscriber, the call dialing the aforementioned local 3G number (step 6 ). The GMSC 40 then sends an inquiry to the system server 10 for causing the 2G HLR 30 to dial the video call with the local 3G number (step 7). The query includes a MAP messaging message "Send Routing Information" to obtain the current location of the user.

In response, the system server 10 will first check the mapping of the local 3G number and convert the number to the roaming user's 2G mobile number. The process includes, based on the called number of the incoming video call, the user searching or retrieving the IMSI (International Mobile Subscriber Identity) from the associated database server 10 and its actions in the 2G home network. number.

The server 10 then sends a query to the 2G HLR 30 using a short message service (SMS) algorithm with the priority bit set to high, the query being a MAP message request based on the 2G action number "sending routing information for short messages" ('Send Routing Information for Short Message') (step 8). The 2G HLR 30 responds to the system server 10 with the user's current access MSC address (i.e., its current location) (step 9), which was previously determined by the VMSC 20 and updated at the HLR 30 (step 2).

After retrieving the user's current VMSC address, the system server 10 will check the VMSC address to see if the mobile incoming video call service is allowed in the Public Land Mobile Network (PLMN), depending on the storage. The data in the relevant database server.

If the incoming video call service is available, the system server 10 will send a MAP message "Provide Roaming Number" to the VMSC 20, the message including the bearer information of the video call type (BS30), and retrieved from it. The 3G roaming number used to forward the video call (step 10). If the incoming video call service is not available, the error is returned to the GMSC 40 of the WCDMA network by returning a response to the MAP message "Send Routing Information", according to the cause code "facility". The call will be rejected if the 'Facility is not supported in the PLMN'.

The VMSC 20 will reply to the system server 10 with the requested roaming number (step 11). The system server 10 then provides the roaming number to the GMSC 40 of the WCDMA network (step 12), which will then call the inbound 2G roaming client with the 3G roaming number to deliver the video call to him (step 13).

Therefore, in order to allow a 2G inbound roaming customer to enjoy video telephony services in a 3G mobile network, a BS30 service parameter is first added to the feature list of the user profile during roaming into the 3G network. The 2G inbound roaming client can then place and receive a video call by inserting the BS30 parameters and replacing the mobile number of the 2G inbound roamer with a 3G local mobile number.

The present invention is to be given by way of example only, and various modifications and/or changes may be made by those skilled in the art to the described embodiments without departing from the scope of the invention. be appointed.

1~13‧‧‧Steps

10‧‧‧System Server

20‧‧‧(3G)MSC/(3G)VMSC

21‧‧‧(3G)VIR

30‧‧‧(2G)HLR

40‧‧‧(3G)GMSC

1 is a schematic signal flow diagram illustrating an initial procedure of an embodiment of an active video telephony method of the present invention; and FIG. 2 is a similar schematic signal flow diagram illustrating the action of FIG. The subsequent procedure of the video telephony method.

1~5‧‧‧ steps

10‧‧‧System Server

20‧‧3G MSC

21‧‧3G VLR

30‧‧‧2G HLR

Claims (15)

An active video telephony service for providing mobile video telephony services to an inbound roaming mobile phone user from a second generation (2G) mobile telephone network in a third generation (3G) mobile telephone network, The method comprises the steps of: (a) providing a system server connected to the third and second generation networks; (b) obtaining, by the system server, the location of the user in the third generation network (c) obtaining, by the system server, a user profile having a feature list from a start location register of the second generation network, the feature list including a second generation mobile phone number of the user (d) correcting the feature list of the user profile by the system server by initiating the video telephony service and replacing the second generation mobile phone number with a third generation local mobile phone number; and (e) by The system server updates the user profile modified by the user in a mobile switching center of the third generation network, so that the user can place an external video call in the third generation network. The mobile video telephone service method of claim 1, wherein the step (b) comprises the step of: determining, by the mobile switching center, the location of the user in the third generation network, and then in the system The user location is updated in the server. The mobile video telephone service method of claim 2, wherein the step (b) comprises the following steps: subsequently based on the user An International Mobile Subscriber Identity (IMSI) that verifies the user's identification code by the system server. The mobile video telephone service method of claim 2, wherein the step (b) comprises the step of: subsequently updating the user location in the home location register by the system server. The mobile video telephone service method of claim 1, wherein the step (d) comprises the step of: initiating a video telephony service by adding a service parameter to the feature list of the user profile. The mobile video telephone service method of claim 5, wherein the service parameter in step (d) is inserted into a mobile access protocol (MAP) message "insert user profile" or from the MAP message Checked in "Insert User Profile", the MAP message "Insert User Profile" is sent from the system server to the mobile switching center. The mobile video telephone service method of claim 1, wherein the step (b) to the step (e) are performed while the user roams into the third generation network. The mobile video telephone service method according to any one of claims 1 to 7, comprising the following steps: (f) when a video call is sent to the user, the system server sends An inquiry of the user location in the home location register; and (g) providing the user location to the system server by the home location register, based on which the system server can obtain the use A roaming number for the transmission of the video call. The mobile video telephone service method according to claim 8, wherein the inquiry in the step (f) includes a request for routing information of the short message service based on the second generation mobile phone number. . The mobile video telephone service method of claim 8, wherein the user location is included in an address of the mobile switching center. The mobile video telephone service method of claim 10, wherein the query for retrieving the address from the home location register in step (f) comprises the step of: based on the video call The called number, obtains an International Mobile Subscriber Identity (IMSI) and the second generation mobile phone number of the user from the system server; and sends a Mobile Access Protocol (MAP) message "Send a short message route" Information is given to the home location register. The mobile video telephone service method according to any one of claims 1 to 7, wherein the system server includes a signaling server for relaying a roaming message; an application server And for collecting relevant information from the roaming messaging messages, performing application logic for signaling parameters, simulating signaling for the second generation network for call routing information, and routing the incoming calls to the video The three generations of networks work together; and a database server for storing information about the second generation network. The mobile video telephone service method according to claim 12, wherein the sending server supports the SS7 for decoding the sending messages. Mobile Access Protocol (MAP) stack (3GPP TS 29.002 compliance). The mobile video telephone service method according to any one of claims 1 to 7, wherein the third generation local mobile telephone number in the step (d) is exclusive to the second generation network. A specific International Mobile Subscriber Identity (IMSI) range. The mobile video telephone service method according to any one of claims 1 to 7, wherein the third generation local mobile telephone number in step (d) is replaced by a mobile access protocol (MAP). The second generation mobile phone number field in the message "Insert User Profile", the MAP message "Insert User Profile" updates the modified user profile in step (e).