CN101179770A - Method and system for call transfer controlled by switch in mobile communication system - Google Patents

Abstract

The present invention provides a method and system for an exchange in a mobile communication system to control call transfer, wherein the method includes: step 1, when the called user has subscribed to the call transfer service and needs call transfer, the mobile switching center from the home Obtain the forwarding number registered in the home location register by the called user in the location register; step 2, after the mobile switching center has obtained the forwarding number, further obtain the number information and current attribution information of the called user, and forward User's number information and current attribution information; and step 3, the mobile switching center judges whether the connection condition is satisfied according to the number information of the called subscriber and the current attribution information and the number information of the forwarding user and the current attribution information, and If the connection condition is met, the call from the calling user to the forwarded user is connected; otherwise, the call transfer is rejected. Therefore, adopting the method and system of the present invention can effectively reduce the possibility of wrong forwarding of users.

Description

Method and system for call transfer controlled by switch in mobile communication system

technical field

The present invention relates to a mobile communication system, more particularly, to a method and system for an exchange in the mobile communication system to control call transfer.

Background technique

With the popularity of mobile terminal equipment (such as mobile phones), users are no longer satisfied with simple call services, and will sign some supplementary services with rich content with mobile operators, and the call forwarding service is one of them. Call forwarding, also known as incoming call forwarding, is a network function, that is, when the user's phone cannot be answered or is unwilling to answer the call, the incoming call can be forwarded to other phone numbers, including:

Unconditionally transfer incoming calls, regardless of the state of the mobile phone, unconditionally transfer all incoming calls to a pre-booked phone number;

If the user is busy transferring incoming calls, when the called mobile phone is already on the phone and cannot connect to the current call, the incoming call will be transferred to a pre-reserved phone number;

Subscriber No Answer Forwarding, that is, when the subscriber's mobile phone is ringing, but the subscriber does not answer the call within the predetermined time, the incoming call is forwarded to a pre-reserved telephone number; and

Unreachable transfer, if a normal call cannot be realized because the user's mobile phone is turned off or not in the effective service area, all calls to the user will be transferred to his preset phone number.

Fig. 1 is a flow chart of the basic processing of forwarding on no answer according to the prior art.

Fig. 2 is a flowchart of ordinary call processing according to the prior art.

As shown in Figure 1 and Figure 2, the process of forwarding on no answer includes the following steps:

S102, the calling user A initiates a call to the called user B, and the mobile switching center (Mobile Switching Center, MSC) connects the call;

S104, the terminal of the called user B starts to enter the ringing state, waiting for the user to answer, and at the same time, the MSC starts the no-answer timer for this call;

S106, judging whether the called user answers the call within the time length set by the no-response timer, if answered, then go to S108, otherwise go to S110;

S108, if the user answers the call, the subsequent processing is the same as the normal call flow (as shown in Figure 2);

S110, the no-answer timer will overtime, and the MSC stops the ringing of the B subscriber and sends a "calling incomplete" message to the Visitor Location Register (VLR);

S112. After receiving the "call not completed" message from the MSC, the VLR starts to interact with the Home Location Register (HLR) to obtain the supplementary service subscription information of the B number;

S114, judging whether the supplementary service information signed by the called user includes "transfer if user does not answer", if not included, go to S116, otherwise go to S118;

S116, if the user does not subscribe to the service of "transfer without user answer", the VLR returns the "incoming call rejection" message to the MSC, and the call will be released;

S118, if the user has subscribed to the "User No Answer Forwarding" service, the VLR will return the "Incoming Call Response" message to the MSC, which carries the call forwarding number C preset by User B. When the MSC receives the "Incoming Call Response" message, the call forwarding service is triggered, the MSC saves the number of user C carried in the message, releases the call between user A and user B and directly starts to connect the call between user A and user C; and

S120, the terminal of user C rings, user C answers the call from calling user A, the call enters a stable conversation state, and finally one party hangs up, the call is released, and the process ends.

In this process, it is worth noting that the called user B, as a user in the mobile communication network system, may roam abroad or roam out of the long-distance area, and the user usually sends his own long-distance area number (for example, the C number described above) as the number for call forwarding. In this way, after the user roams to other long-distance areas, if the call is not answered (for example, the user does not hear the ringtone), the call transfer is triggered, and the call will be transferred back to a certain number in the original long-distance area, and the user At this time, it may be impossible to answer at all, and if C is answered by other people, it should be a kind of useless answer, which wastes the user's tariff, and the network resources between the long-distance area switches are also occupied in vain. Therefore, it can be said that the call forwarding service provides a certain degree of convenience for users, but at the same time, there are some disadvantages in the basic processing of this service that need to be solved.

Contents of the invention

In order to solve the problems in the prior art, the present invention proposes a method for an exchange in a mobile communication system to control call transfer, the method comprising: Step 1, when the called user has signed a call transfer service and needs call transfer, The mobile switching center obtains the forwarding number registered in the home location register by the called user from the home location register; step 2, after the mobile switching center has obtained the forwarding number, further obtains the number information and the current attribution of the called user information, and the number information and current attribution information of the forwarding subscriber; If the connection condition is satisfied, the call from the calling user to the forwarded user is connected, otherwise, the call transfer is rejected.

Wherein, step 1 includes: the mobile switching center sends a forwarding request message to the home location register to request a forwarding number; and after the home location register receives the forwarding request message, returns the forwarding number to the mobile switching center.

Step 2 includes: when the calling user initiates a call to the called user, the mobile switching center receives the call setup message of the calling user, and sends an incoming call message to the access location register; when the access location register receives the incoming call message Afterwards, message interaction will be carried out with the home location register to obtain the number information of the called user and the current home information of the called user. The paging message of the place and number information is sent to the mobile switching center to page the called user; the mobile switching center obtains the long-distance area message of the called user's current home through the current home of the called user; and in the mobile switching center from During the process of acquiring the forwarded-to number, the home location register synchronously acquires the number information of the forwarded-to number and the current attribution information.

According to the method of the present invention, the connection condition includes at least one of the following: the forwarding number is not an international number, the called party is not an international roaming user, the current home of the forwarding number and the current home of the called number are in the same toll area The internal, forwarding number and called number are in the same network.

In addition, the home location register stores the user's number information and the user's current home location information.

The present invention also proposes a system in which an exchange in a mobile communication system controls call transfer. The system includes: a device for obtaining a forward-to-number, located on a mobile switching center, used when the called user has signed a call transfer service and needs to call When transferring, obtain the forwarding number registered in the home location register by the called user from the home location register; the device for obtaining number information and attribution information is located on the mobile switching center, and is used to After the number is transferred, the number information and current attribution information of the called user are obtained, as well as the number information and current attribution information of the forwarded user; Whether the current attribution information, the number information of the forwarding user and the current attribution information meet the connection conditions, and if the connection conditions are met, the call from the calling user to the forwarding user is connected; otherwise, the call transfer is rejected .

Wherein, the device for obtaining the forwarding number includes: a requesting module, configured to send a forwarding request message to the home location register, and request a forwarding number; The number is returned to the requesting module.

The device for obtaining number information and attribution information includes: a call message sending module, used to receive a call setup message of the calling user when the calling user initiates a call to the called user, and send an incoming call message to the access location register; Obtaining the called user location module, when the access location register receives the incoming call message, it is used for message interaction with the home location register to obtain the called number information and the current attribution information of the called user, and if the access location register Judging that the calling user is allowed to call the called user, sending a paging message containing the user's attribution and number information to the mobile switching center to page the called user; obtaining the long distance area information module of the called user, through the called user's The current attribution is used to obtain the long-distance area information of the called user's current attribution; and the module for obtaining the forwarding user information is used to obtain the forwarding number synchronously during the process of obtaining the forwarding number from the home location register by the device for obtaining the forwarding number. The number information of the number and the current attribution information.

According to the system of the present invention, the connection conditions include at least one of the following: the forwarding number is not an international number, the called party is not an international roaming user, the current home of the forwarding number and the current home of the called number are in the same toll area The internal and forwarded numbers and the called number are in the same network.

In addition, the home location register stores the user's number information and the user's current home location information.

Therefore, by adopting the method and system of the present invention, the possibility of wrong forwarding of mobile users can be effectively reduced, communication charges can be saved for users, and user satisfaction can be improved. At the same time, it also reduces the useless occupation of valuable network resources among the exchange offices in each long-distance area, improves the use efficiency of the network, and can bring obvious economic and social benefits.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:

Fig. 1 is a basic processing flowchart of forwarding on no answer according to the prior art;

Fig. 2 is a flow chart of ordinary call processing according to the prior art;

Figure 3 is a flow chart of the method according to the invention;

Figure 4 is a flowchart of an embodiment of a method according to the invention; and

FIG. 5 is a block diagram of a system for switch-controlled call forwarding according to the present invention.

Detailed ways

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

Figure 3 is a flow chart of the method according to the invention.

As shown in Figure 3, the following steps are included:

S302. When the called user has subscribed to the call forwarding service and needs call forwarding, the mobile switching center obtains the forwarding number registered in the home location register by the called user from the home location register;

S304, after the mobile switching center has obtained the forwarding number, further obtain the number information and current attribution information of the called user, as well as the number information and current attribution information of the forwarding user; and

S306. The mobile switching center judges whether the connection condition is satisfied according to the number information of the called user and the current attribution information and the number information and the current attribution information of the forwarding user, and connects the calling user if the connection condition is satisfied. Call forwarded to the user, otherwise, reject the call forwarding.

Wherein, S302 includes: the MSC sends a forwarding request message to the HLR to request a forwarding number; and after the HLR receives the forwarding request message, returns the forwarding number to the MSC.

S304 includes: when the calling user initiates a call to the called user, the mobile switching center receives the call setup message of the calling user, and sends an incoming call message to the access location register; after the access location register receives the incoming call message , will interact with the home location register to obtain the number information of the called user and the current home location information of the called user. The paging message of the number information is sent to the mobile switching center to page the called user; the mobile switching center obtains the long-distance area message of the called user's current home through the current home of the called user; During the process of acquiring the forwarded-to number, the location register simultaneously acquires the number information of the forwarded-to number and the current attribution information.

According to the method of the present invention, the connection condition includes at least one of the following: the forwarding number is not an international number, the called party is not an international roaming user, the current home of the forwarding number and the current home of the called number are in the same toll area , and the forwarding number and called number are in the same network.

In addition, the home location register stores the user's number information and the user's current home location information.

Figure 4 is a flowchart of an embodiment of a method according to the invention.

As shown in Figure 4, the following steps are included:

S402, when the user subscribes to the call forwarding service and meets the conditions for triggering the call forwarding, the MSC starts to apply to the HLR for obtaining the forwarding (ie, call forwarding) number;

S404. After receiving the call forwarding number C returned by the HLR, the MSC further obtains the number information and current attribution information of user B and user C;

S406, determine whether the call forwarding number C is an international number, if yes, turn to S408, if not, continue to execute S410;

S408, rejecting the call forwarding service, and releasing the call;

S410, judging whether the called user B is an international roaming user, if yes, go to S412, if not, go to S414;

S412, rejecting the call forwarding service, and releasing the call;

S414, judging whether the current home of the call forwarding number C and the current home of the called number B are in the same toll area, if not, go to S416, if they are, go to S418;

S416, rejecting the call forwarding service, and releasing the call;

S418, judging whether the call forwarding number C and the called number B are in the same network, that is, the mobile network code (Mobile Network Code, MNC) is the same, if not, go to S420, if in, then go to S422;

S420, rejecting the call forwarding service and releasing the call; and

S422, continue the call between number A and number C, and the subsequent process is the same as the normal forwarding.

Further, S402 includes the following steps:

The MSC sends a forwarding request message to the HLR to request a forwarding number; and

After receiving the forwarding number request message, the HLR returns the forwarding number registered by the user to the MSC.

Further, in S404, relevant information of the called user and the call forwarding user may be obtained respectively through the following processing steps:

Acquisition of called user information:

When the calling user initiates a call, the MSC will receive a "call setup" message from the calling user, and then send an "incoming call" message to the VLR;

The HLR stores various types of numbers and the current location information of the user. If the VLR allows this call after analysis, the VLR will interact with the HLR to obtain the type information of the called number and the current location information of the called number and send the call to the HLR. The MSC sends a "paging" message for paging the called party, which contains the user's attribution and number information; and

The MSC can obtain information about the toll area to which the called user currently belongs through the user's current LAI.

Obtaining call transfer user information:

When the MSC acquires the forwarding number from the HLR, the MSC acquires the number information and the current attribution information of the call forwarding number synchronously.

FIG. 5 is a block diagram of a system 500 for switch-controlled call forwarding according to the present invention.

As shown in Figure 5, the system includes:

Obtaining the forwarding number device 502, located on the mobile switching center, used to obtain the forwarding number registered in the home location register by the called user from the home location register when the called user has subscribed to the call forwarding service and needs call forwarding. Number;

The device 504 for obtaining number information and location information is located on the mobile switching center, and is used to obtain the number information and current location information of the called user, as well as the number of the forwarding user after the device for obtaining the forwarding number has obtained the forwarding number information and current attribution information; and

Judging means 506, located on the mobile switching center, for judging whether the number information and current attribution information of the called subscriber and the number information and current attribution information of the forwarding subscriber meet the connection conditions, and if the connection conditions are met, Next, connect the call from the calling user to the forwarding user, otherwise, reject the call transfer.

Wherein, the device 502 for obtaining the forwarding number includes: a request module 5022, configured to send a forwarding request message to the HLR to request a forwarding number; and a response module 5024, configured to Return the forwarding number to the requesting module.

The device 504 for obtaining number information and location information includes: a sending call message module 5042, configured to receive a call setup message of the calling user when the calling user initiates a call to the called user, and send an incoming call message to the access location register message; obtain the called user location module 5044, when the access location register receives the incoming call message, it is used to carry out message interaction with the home location register to obtain the called number information and the current attribution information of the called user, and if the access The incoming location register judges that the calling user is allowed to call to the called user, and the paging message containing the user's attribution and number information is sent to the mobile switching center to page the called user; obtain the called user long-distance area information module 5046, through The current attribution of the called user is to obtain the long-distance area information of the current attribution of the called user; and the module 5048 for obtaining the forwarding-to user information is used to synchronize Obtain the number information and current attribution information of the forwarded-to number.

According to the system of the present invention, the connection conditions include at least one of the following: the forwarding number is not an international number, the called party is not an international roaming user, the current home of the forwarding number and the current home of the called number are in the same toll area The internal and forwarded numbers and the called number are in the same network.

In addition, the home location register stores the user's number information and the user's current home location information.

The method and device of the present invention are also applicable to other types of forwarding, for example, forwarding when the user is busy.

To sum up, the method and system of the present invention can effectively reduce the possibility of wrong forwarding for mobile users, save communication charges for users, and improve user satisfaction. At the same time, it also reduces the useless occupation of valuable network resources among the exchange offices in each long-distance area, improves the use efficiency of the network, and can bring obvious economic and social benefits.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. the method that shifts of the switch controlling call in the mobile communication system is characterized in that described method comprises:

Step 1, when the signatory call transfer service of called subscriber, and when needing calling transfer, mobile switching centre obtains the transferred number of being registered by described called subscriber in described attaching position register from attaching position register;

Step 2 after described mobile switching centre has obtained described transferred number, is further obtained described called subscriber's number information and current information of home location, and the number information of forwarding subscriber and current information of home location; And

Step 3, described mobile switching centre judges whether to satisfy on-condition according to described called subscriber's the described number information and the described number information and the described current information of home location of described current information of home location and described forwarding subscriber, and satisfying under the situation of described on-condition, the calling subscriber that continues is to the calling of described forwarding subscriber, otherwise, refuse this calling transfer.

2. method according to claim 1 is characterized in that, described step 1 comprises:

Described mobile switching centre changes request message before described attaching position register sends, ask described transferred number; And

After described attaching position register receives to change request message before described, described transferred number is returned to described mobile switching centre.

3. method according to claim 1 is characterized in that, described step 2 comprises:

When described calling subscriber initiated calling to described called subscriber, described mobile switching centre received described calling subscriber's call setup message, and sends the Incoming message related to calls to the on-position register;

After described on-position register is received described incoming call message, to carry out interacting message with described attaching position register, obtain described called subscriber's number information and described called subscriber's current information of home location, if described on-position register is judged the calling of the described calling subscriber of permission to described called subscriber simultaneously, the beep-page message that will comprise user ascription area and number information sends to described mobile switching centre with the described called subscriber of paging;

Described mobile switching centre obtains the trunk zone message of the current ownership place of described called subscriber by described called subscriber's current ownership place; And

Obtain the process of described transferred number from described attaching position register in described mobile switching centre, obtain the described number information and the described current information of home location of described transferred number synchronously.

4. method according to claim 1, it is characterized in that, described on-condition comprises following at least a: described transferred number be not international number, described called subscriber be not the described current ownership place of the described current ownership place of international roaming user, described transferred number and described called number in same trunk zone, and described transferred number and described called number are in same network.

5. according to each described method in the aforementioned claim, it is characterized in that described home location register stores user's number information and described user's current information of home location.

6. the system that shifts of the switch controlling call in the mobile communication system is characterized in that described system comprises:

Obtain the transferred number device, be positioned in the mobile switching centre, be used for signatory call transfer service, and when needing calling transfer, from attaching position register, obtain the transferred number of in described attaching position register, registering by described called subscriber as the called subscriber;

Obtain number information and return the ground massaging device, be positioned in the described mobile switching centre, be used for described obtain the transferred number device and obtained described transferred number after, obtain described called subscriber's number information and current information of home location, and the number information of forwarding subscriber and current information of home location; And

Judgment means, be positioned in the described mobile switching centre, be used to judge whether described called subscriber's the described number information and the described number information and the described current information of home location of described current information of home location and described forwarding subscriber satisfy on-condition, and satisfying under the situation of described on-condition, the calling subscriber that continues is to the calling of described forwarding subscriber, otherwise, refuse this calling transfer.

7. system according to claim 6 is characterized in that, the described transferred number device that obtains comprises:

Request module is used for changeing request message before described attaching position register sends, and asks described transferred number; And

Respond module after described attaching position register receives to change request message before described, is used for described transferred number is returned to the described request module.

8. system according to claim 6 is characterized in that, describedly obtains number information and the information of home location device comprises:

Send the message related to calls module, when described calling subscriber initiates calling to described called subscriber, be used to receive described calling subscriber's call setup message, and send the Incoming message related to calls to the on-position register;

Obtain called subscriber's position module, after described on-position register is received described incoming call message, be used for carrying out interacting message with described attaching position register, obtain described called number information and described called subscriber's current information of home location, if described on-position register judges that allowing described calling subscriber to arrive described called subscriber ground calls out simultaneously, the beep-page message that will comprise user ascription area and number information sends to described mobile switching centre with the described called subscriber of paging;

Obtain called subscriber's trunk zone information module,, be used to obtain the trunk zone information of the current ownership place of described called subscriber by described called subscriber's current ownership place; And

Obtain the forwarding subscriber information module, obtain the process of described transferred number from described attaching position register, be used for obtaining synchronously the described number information and the described current information of home location of described transferred number at the described transferred number device that obtains.

9. system according to claim 6, it is characterized in that described on-condition comprises following at least a: described transferred number be not international number, described called subscriber be not the described current ownership place of the described current ownership place of international roaming user, described transferred number and described called number in same trunk zone and described transferred number and described called number in same network.

10. according to each described system in the claim 6 to 9, it is characterized in that described home location register stores user's number information and described user's current information of home location.

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