CN1435984A - Method for assisting calling completion using short message - Google Patents

Abstract

The invention discloses a method for assisting call completion by using short messages, which is characterized in that: when a calling user initiates a call, a call completion request is generated at the same time, if the system cannot successfully connect to the called party, the request is placed in the request queue, and when Once the user can connect again, according to the situation of the request queue, send a short message to the calling user, and inform the calling user that the called party can be connected. It is convenient and cheap to use the tool of short message to assist the completion of the call, and the notification process is automatically initiated by the network without manual intervention.

Description

The Method of Utilizing Short Messages to Assist Call Completion

Technical field:

The invention relates to a method for assisting call completion by using short messages.

Background technique:

In a communication system, especially in a wireless communication network, due to various reasons such as the user moves out of the service area, the user is busy, and the user has turned off the phone, the called user often cannot be connected. Because the calling user does not know when the called party can be connected, he often adopts the method of repeatedly dialing the called party after a period of time, but often fails. The processing load of the network reduces the connection rate.

In order to successfully complete the call connection when the user cannot complete the call temporarily, in the GSM communication system, a variety of supplementary services are provided to complete the call. The following lists several supplementary services in the GSM protocol, and describes the application of these protocols for the call completion function:

1. CCBS (Completion Call to Busy Subscriber)

The application of CCBS is as follows: when calling user A calls user B, if user B is busy, user A can request a CCBS supplementary service to user B from the network. Afterwards, the network constantly monitors user B. When user B is idle, the network automatically calls A, and after user A accepts the CCBS call, the network initiates a CCBS call to user B. In this way, by using the CCBS supplementary service, when user B is idle, user A can automatically complete the call in time, which saves the pain of repeated calls.

2. Call Forwarding

There are four types of forwarding: forwarding unconditional, forwarding on busy, forwarding on no answer, and forwarding unreachable. The main purpose of unconditional forwarding is to reduce communication costs, avoid interruptions, improve communication quality, etc., not to complete calls, and will not be discussed in this article. The main purpose of the three types of forwarding on busy, forwarding on no answer, and forwarding on unreachable is to complete calls and obtain information in a timely manner. Forward on busy is to transfer the call to other called users or to the voice mailbox when the called party is busy. The main possible situation of forwarding on no answer is that the called user is not with the mobile phone, is in a noisy environment, cannot hear the ringing tone, and is unwilling to answer the call. The call is transferred to other called users or to the voice mailbox. Unreachable forwarding When the called party has turned off the phone or left the service area, if it is impossible to connect to the called party, the call is transferred to other called party or to the voice mailbox. After forwarding to the voice mailbox, the user can actively query the voice mailbox and retrieve information. Some voice mailboxes will automatically initiate a call to the called user, or send a short message to the called user, and the notification will compare the information extracted from the voice mailbox.

3. Call Waiting

Call waiting is when the called mobile user is talking, the network can prompt the called user that a new call is coming, the called user can choose: 1 ignore the new call 2 reject the new call 3 answer the new call, if the user chooses To answer the new call, the purpose of completing the call is achieved.

4. Calling line identification presentation

Caller ID display is the most widely used service in the GSM network. This service itself cannot provide the function of completing the call. When the caller ID is successful, the user must be in the service area, so the caller ID is required to complete the call. The situation of the function is rare, and the application situation of more is that the user may not bring a mobile phone, causing the call to be unanswered. The user can check the unanswered phone numbers in the mobile phone, call back selectively, and complete the unfinished calls before. The present invention cannot assist in realizing the call completion function in the case of no answer, so the caller display is a beneficial supplement.

5. Short Message

Users of the GSM network can send or receive digital or text messages of limited length, and a short message can transmit up to 160 English characters or 70 Chinese characters. A notable feature of the mobile station receiving the short message SM-MT is that the network knows whether the called party has received the short message. If not, the network will save the message. Once the network finds that the called party can be connected, the message can be resent to ensure The message can be received by the user. The short message mainly uses the signaling channel to transmit information, occupies less resources, is cheap, and is more and more widely used. The short message itself cannot provide the function of completing the call. The present invention mainly uses the short message as a convenient and cheap tool to transmit information, and informs the calling user that the called party can be connected. After the calling party obtains the information, he can dial the called party again. , to complete a previously incomplete call.

Although many of the above supplementary services of GSM can partially achieve the purpose of completing calls, any of them has limited capabilities. The applications and shortcomings of these protocols for call completion functions are as follows:

CCBS service: CCBS service can ensure that the user completes the call in the first time when the called party is busy, but the shortcomings of CCBS are obvious. CCBS can only handle the called busy situation, and cannot handle the user shutdown or the user leaving the service area. and so on. As a supplementary service, CCBS is very complicated to implement and has a complicated process. It needs the support of MSC/VLR, HLR and other systems, and all offices need to support ISUP signaling. It is not widely used. On the man-machine interface, users may not be too comfortable with it.

Call forwarding service: Call forwarding can deal with situations such as busy users and unreachable users. It should be a good means of completing calls. But there are also some disadvantages: the user has to pre-arrange the forwarded number, and this pre-arrangement requires the user to have good predictability, or the user's activities are very regular. Otherwise, it is necessary to frequently register the forwarding-to number. For forwarding on busy and forwarding on unreachable, it is likely that other people are required to help the called user to complete the call, but it is likely that the call cannot be replaced by others. There are so many unknowns involved in forwarding to someone else that the absolute majority of forwards are to voicemail. The called user can automatically retrieve the information at a later time. But a lot of communication requires two-way communication, and the voice mailbox method cannot achieve the purpose of two-way communication, and the user also needs to pay the cost of the voice mailbox and forwarding fees. Operators need to purchase necessary voice mailbox equipment, which increases costs.

Call waiting is also a means of completing calls, and its application is simple. Generally, HLR, MSC and other equipment on the network currently support it, and it is widely used. But it can only be applied in a special case where the user is busy.

Invention content:

The purpose of the present invention is to solve the above problems and provide a method for using short messages to assist call completion. In the case that the call cannot be successfully connected, the called user can be automatically notified of the message that someone has called, and it is convenient and cheap. .

In order to achieve the above object, the present invention proposes a method for using short messages to assist call completion, which is characterized in that: when the calling user initiates a call, a call completion request is generated at the same time, if the system cannot successfully connect to the called party, the request is placed in the In the request queue, once the user can be connected again, according to the situation of the request queue, send a short message to the calling user, and inform the calling user that the called party can be connected.

Due to the adoption of the above scheme, when the call cannot be completed, the called user is actually in the monitored state. When the called user becomes idle or returns to the service area and other reasons, the called user can be called again and can be connected. The network notifies the calling user at the first time. At this time, the calling user can choose to re-initiate the call according to the received information to complete the communication that was not completed before. Because at the first time, the calling user can know that the called party can be connected and can communicate in time. After the calling user has such a service, he knows that he can communicate with the called party in the fastest time, so there is no need to stop Land trial call, improving the connection rate and reducing the network load. It is convenient and cheap to use the tool of short message to assist the completion of the call, and the notification process is automatically initiated by the network without manual intervention.

Description of drawings:

Figures 1 and 2 are schematic diagrams of a user shutdown situation.

Fig. 3, Fig. 4, Fig. 5 and Fig. 6 are schematic diagrams of the situation that the called user is not in the service area.

Fig. 7 and Fig. 8 are schematic diagrams of the situation that the user is busy.

Detailed ways:

The present invention will be further described in detail through several specific embodiments in the mobile network and in conjunction with the accompanying drawings. The list of abbreviations used in the description (including the figures) is as follows:

MSC: Mobile Switching Center

VLR: Visitor Location Register

HLR: Home Location Register

GSM: Global Digital Mobile Communications Network

CCBS: Completion Call to Busy Subscriber

SM-MT: Short Message

ISUP: Integrated Service Data Network User Part/Protocol (ISDN User Part)

MAP: Mobile Application Part

MSRN: Roaming Number

MS: mobile station (ie user)

SC: short message center

SRI: get routing information

PRN: Provide a roaming number

SRI_ACK: Get routing information response signal

PRN_ACK: Provide roaming number response signal

Set-up: initiate

Disconnect: Disconnect the stitches

IAI: Initial Address Message

ACM? Address Full Message

ANC? answer

Alerting ringing

Connect: continue

Connect ack: connection response

Call confirmed: call confirmed

REL: release

Paging: paging

USSD: Unstructured Supplementary Services

VMSC: Visit Mobile Switching Center

CDMA: Code Division Multiple Access

WCDMA: Wideband Code Division Multiple Access

CDMA2000: Code Division Multiple Access 2000

PSTN: Public Switched Telecommunications Network

The basic process is: when the calling user initiates a call, a request for completing the call is generated at the same time. If the system cannot successfully connect to the called party, the request is placed in the request queue. Once the user can be connected again, according to the status of the request queue , send a short message to the calling user, and inform the calling user that the called party can be connected. According to the actual situation, it needs to be divided into three situations, 1 is the situation that the user turns off the phone, at this time, it can be divided into two situations according to whether the user is in the front VLR after returning to the service area; 2 is the situation that the user leaves the service area, the It is further divided into the situation of pre-paging and the situation of ordinary paging, and the situation of pre-paging and ordinary paging is divided into two situations respectively according to whether the user is in the front VLR after returning to the service area, and 3 is the situation that the user is busy; There are 7 different types in total.

Embodiment 1: Figures 1 and 2 describe the situation when the user turns off the phone, wherein Figure 1 is the situation when the phone is turned off, and Figure 2 is the process after the called user turns on the phone. Its process includes:

1) when the calling user (A) calls the called user (B), a call request is generated and completed; 2) when a roaming number (MSRN), the visitor location register (VLR (B)) where the called user (B) is located sends the calling Call the number and complete the call request registration in the visitor location register (VLR (B)); 3) because the visitor location register (VLR (B)) finds that the user has shut down, the call fails; 4) when the called user ( B) when starting up, notify its mobile switching center/visitor location register (MSC/VLR (B)); 5) this visitor location register (VLR (B)) finds that there is a call request to be completed, then utilizes the original preserved data, Initiate a short message to the original calling user (A), indicating that the called user (B) can now be connected.

If the user is no longer in the original visitor location register (VLR (B)) after rebooting, then the 4th), 5) steps are changed to:

Embodiment 2: Figures 3-6 describe the situation that the user is not in the service area, wherein Figure 3 is the situation where the called party is not in the service area and pre-paging, Figure 4 is the situation where the called party is not in the service area and is in normal paging, Figure 5 It is the situation that the called party returns to the same MSC (or VLR) and assists the call to complete. Fig. 6 shows the situation that the called party returns to the service area but assists the call to complete after another MSC (or VLR).

Therefore, it is divided into four specific cases:

Situation 1: Pre-paging and location update are in the same VLR, as shown in Figure 3 and Figure 5, the process is as follows:

1) when the calling user (A) calls the called user (B), a call request is generated and completed; 2) when a roaming number (MSRN), the visitor location register (VLR (B)) where the called user (B) is located sends the calling 3) because of adopting pre-paging, this visitor location register (VLR (B)) initiates paging; Because the called user is not in the service area, Paging failure, this call failure; 4) after the called user returns to the service area, initiate a location update to notify the visitor location register (VLR); 5) at this time, the location update is in the same visitor location register (VLR), then After the location update is completed, the visitor location register (VLR) checks whether the call request is completed, and if so, utilizes the data saved originally to initiate a short message to the calling user (A), and the called user (B) can receive the short message. The caller (A) is notified of the communication.

Situation 2: the situation that pre-paging, location update are not in the same VLR, see Fig. 3, Fig. 6, the 5th) step in its flow process should be changed into: 5) at this moment, if location update is not in the same VLR (VLR ), then in the location update process, the home location register (HLR) where the called subscriber (B) is located notifies the visitor location register (VLR) where the called subscriber (B) was before to delete the subscriber data, and the visitor location register (VLR) Find that there is a call request to complete, then utilize the data saved originally to initiate a short message to the calling user (A), and notify the calling user (A) that the called user (B) can be connected.

Situation 3: Common paging, the situation of location update in the same VLR, see Fig. 4, Fig. 5, the 3rd) step in its flow process should be changed (relative to situation 1): 3) because adopting common paging, visiting location The register (VLR) distributes the roaming number (MSRN), waits for the arrival of the initial address message (IAI) in the call connection message, and initiates paging. Because the user is not in the service area, the paging fails and the call also fails.

Situation 4: common paging, the situation that location update is not in the same VLR, see Fig. 4, Fig. 6, the 3rd) step in its flow process should be changed (relative to situation 2): 3) because adopting common paging, visiting location The register (VLR) distributes the roaming number (MSRN), waits for the arrival of the initial address message (IAI) in the call connection message, and initiates paging. Because the user is not in the service area, the paging fails and the call also fails.

Embodiment 3: Figures 7 and 8 describe the busy situation of the called user, wherein Figure 7 shows the situation when the user is busy, and Figure 8 shows the situation after the user changes from busy to idle. Its process is:

1) when the calling user (A) calls the called user (B), a call request is generated and completed; 2) when a roaming number (MSRN), the visitor location register (VLR (B)) where the called user (B) is located sends the calling 3) after the call is connected to the called end office, the called user is busy and the call fails; 4) when the called user (B) completes the previous When entering the idle state, the visitor location register (VLR (B)) where the called user (B) is located finds that there is a call completion request, then uses the original saved data to initiate a short message to user A, and the called party The calling subscriber (A) is notified that the subscriber (B) is available.

In the present invention, in order to realize the notification of the unconnected incoming call, some simple functions need to be added to each functional entity. In order to support these functions, it is also necessary to simply modify the standard protocol of GSM, as follows:

1 user data

This function is not open to any user. It is necessary to add support for call completion data in the user data of the HLR. When updating the location, the data is inserted into the VLR. In order for the user to selectively perform the call completion function, the call completion data should include two parts: one is whether the call completion service is registered, and the other is the default activation mode of the call completion service, whether it is default activation or default prohibition. If the default activation mode is adopted, all calls not connected by the calling user will receive short messages when the called user can be connected. If the default mode is disabled, the user can temporarily decide which call can activate this function. The advantage of the default prohibition is that the user can prevent the interruption of too many short messages caused by himself.

2 Activation, deactivation and query of call completion function

Users can decide to deactivate and activate this function by themselves, and can also query this function. This function can be accomplished by using the supplementary service flow of the current GSM network. Through this flow, it is possible to change whether the service can be started, and to change the default activation mode of the service. In the case that the current mobile phone does not support this service, USSD can be used to activate, deactivate and query functions, but the man-machine interface may not be friendly enough. If the user decides the active mode when registering, for example, the default disabled mode, these functions can be omitted.

3 Activation of the call completion function

When the default activation mode is adopted, this function is automatically activated. When the default prohibition mode is adopted, the function can be activated by *XX* called number. If you directly dial the called number, the function will not be activated. .

4 The call completes the transfer of data

In the previous description, it is necessary to transmit the calling number and the start call completion mark through MAP signaling. The calling MSC generates these data and puts them in the routing information SRI message, and the called HLR transparently transmits these in the PRN message. The data and the called VMSC will start the function of sending short messages according to the data and the specific situation.

5 Start of SMS sending

The VMSC where the called user is located starts the sending of the short message according to the situation, which has been clearly described in the previous flow chart and will not be described here.

The above improvements to the functional entity make the present invention realize the following three key factors, thereby making the realization of the present invention possible: 1. The MSC where the calling user A is located can start the call completion function according to the subscription data, and set These data are transmitted to the VMSC of the called office. 2. The VMSC where the called party is located can save the calling number according to the situation of the user. 3. The VMSC at the called office can send a short message to the calling party for timely communication when it detects that the user can continue to communicate according to the situation of the called user.

The present invention can be applied in GSM network, CDMA network, WCDMA network and CDMA2000 network of the third generation. But the present invention is not only applicable to the mobile network, at present, because the public switching communication network PSTN network also can adopt short message to carry out information transfer, if the SC of PSTN and the SC of mobile network can be merged, this function is easy to be used in the fixed network Realization, as long as the fixed network can complete this function through some signaling coordination, and such signaling coordination can be realized through a simple dialing process. This only requires: the two networks can send short messages to each other, can store call completion requests in each other, and can transmit signaling to each other.

In a communication network, especially a mobile communication network, many supplementary services are designed to complete calls. But to sum up, each business has its own advantages and disadvantages, and can only be applied in a narrow range. The present invention is applied in many situations, and can solve the situations that the user is busy, the user shuts down the phone and the user is not in the service area. Secondly, the present invention is simple to implement, and mainly utilizes the mature technology of short messages, which is relatively easy for users to accept. The most prominent feature of the present invention is that the calling user can get connected to the called user at the first time, thereby selectively communicating with the user, thereby greatly facilitating the user and saving the user's time. This feature is only available in CCBS services, which cannot be compared with other services. A user with this function knows that the network will notify him when to call, and will not repeat multiple calls, thus reducing the load on the network, improving the connection rate, optimizing the overall network, and is also very beneficial to the operator.

Claims (10)

1. A method for using short messages to assist call completion, characterized in that: when the calling user initiates a call, a call completion request is generated simultaneously, if the system cannot successfully connect to the called party, the request is put into the request queue, and when the user Once it can be connected again, according to the situation of the request queue, send a short message to the calling user, and inform the calling user that the called party can be connected. 2. The method for assisting call completion by using short messages as claimed in claim 1, characterized in that: when the calling user initiates a call, first check whether the calling user has registered the function of assisting call completion, only the calling user has registered the function function, the completion call request is generated. 3. The method for using short messages to assist call completion as claimed in claim 2, characterized in that: the process is completed in the mobile network, and when the call is initiated, the call completion request is passed through the Mobile Application Protocol (MAP) message The order is delivered to the end office of the visited mobile switching center (VMSC) where the called party is located. If the system cannot successfully connect to the called party, the request is stored in the request queue of the visited mobile switching center (VMSC). 4. The method for using short messages to assist call completion as claimed in any one of claims 1-3, characterized in that: the process is completed in the mobile network, and when the called user shuts down the phone, its The implementation process is as follows: 1) when the calling user (A) calls the called user (B), a call request is generated and completed; 2) when the roaming number (MSRN) is located, the VLR (B) where the called user (B) is )) register the calling number and complete call request in the visitor location register (VLR (B)); 3) because the visitor location register (VLR (B)) finds that the user has shut down, the call fails; 4) when When the called subscriber (B) starts the machine, notify its mobile switching center/visitor location register (MSC/VLR (B)); Save the data, initiate a short message to the original calling user (A), and notify the calling user (A) that the called user (B) can be connected. 5. The method for using short messages to assist call completion as claimed in any one of claims 1-3, characterized in that: the process is completed in the mobile network, and when the called user shuts down the phone, its The implementation process is as follows: 1) when the calling user (A) calls the called user (B), a call request is generated and completed; 2) when the roaming number (MSRN) is located, the VLR (B) where the called user (B) is )) register the calling number and complete call request in the visitor location register (VLR (B)); 3) because the visitor location register (VLR (B)) finds that the user has shut down, the call fails; 4) when When the called user (B) turns on the phone, notify its mobile switching center/visitor location register (MSC/VLR (B)); 5) at this moment, if the startup is not in the same visitor location register (VLR), the The home location register (HLR) where the user (B) is located initiates a location update process, and the home location register (HLR) notifies the visitor location register (VLR (B)) where the called user (B) was before to delete the user data, and the visitor location register (VLR (B)) finds that there is a call completion request, then utilizes the data saved originally to initiate a short message to the calling user (A), and notifies the calling user (A) that the called user (B) can be connected. ). 6. The method for using short messages to assist call completion as claimed in any one of claims 1-3, characterized in that: the process is completed in the mobile network, when the called user is not in the service area, pre-finding In the case of a call, the implementation process is as follows: 1) When the calling user (A) calls the called user (B), a call request is generated and completed; 2) When the roaming number (MSRN) is used, the visiting The location register (VLR (B)) registers the calling number and the completion call request in the visitor location register (VLR (B)); call; because the called user is not in the service area, the paging fails, and this call fails; 4) after the called user returns to the service area, initiate a location update to notify the visitor location register (VLR); 5) at this time, if the location update In the same visitor location register (VLR), after the location update is completed, the visitor location register (VLR) checks whether a call request is completed, and if so, uses the original saved data to initiate a short message to the calling party (A) message to notify the calling user (A) that the called user (B) can be connected. 7. The method for using short messages to assist call completion as claimed in any one of claims 1-3, characterized in that: the process is completed in the mobile network, when the called user is not in the service area, pre-finding In the case of a call, the implementation process is as follows: 1) When the calling user (A) calls the called user (B), a call request is generated and completed; 2) When the roaming number (MSRN) is used, the visiting The location register (VLR (B)) registers the calling number and the completion call request in the visitor location register (VLR (B)); call; because the called user is not in the service area, the paging fails, and this call fails; 4) after the called user returns to the service area, initiate a location update to notify the visitor location register (VLR); 5) at this time, if the location update If they are not in the same visitor location register (VLR), then during the location update process, the home location register (HLR) where the called user (B) is located notifies the visitor location register (VLR) where the called user (B) was previously located to delete the user data , the visitor location register (VLR) finds that there is a call completion request, then utilizes the data saved originally to initiate a short message to the calling user (A), and notifies the calling user that the called user (B) can be connected (A). 8. The method for using short messages to assist call completion as claimed in any one of claims 1-3, characterized in that: said process is completed in the mobile network, when the called user is not in the service area In the case of a call, the implementation process is as follows: 1) When the calling user (A) calls the called user (B), a call request is generated and completed; 2) When the roaming number (MSRN) is used, the visiting The location register (VLR (B)) registers the calling number and the call completion request into the visitor location register (VLR (B)); 3) because of the general paging, the visitor location register (VLR) assigns a roaming number (MSRN) , after waiting for the arrival of the initial address message (IAI) in the call connection message, initiate paging, because the user is not in the service area, the paging fails, and the call also fails; 4) After the called user returns to the service area, initiate a location update notification Visitor Location Register (VLR); 5) now, if the location update is in the same Visitor Location Register (VLR), after the location update is completed, the Visitor Location Register (VLR) checks whether there is a call request to be completed, and if so, utilizes the original Save the data, initiate a short message to the calling user (A), and notify the calling user (A) that the called user (B) can be connected. 9. The method for using short messages to assist call completion as claimed in any one of claims 1-3, characterized in that: said process is completed in the mobile network, when the called user is not in the service area In the case of a call, the implementation process is as follows: 1) When the calling user (A) calls the called user (B), a call request is generated and completed; 2) When the roaming number (MSRN) is used, the visiting The location register (VLR (B)) registers the calling number and the call completion request into the visitor location register (VLR (B)); 3) because of the general paging, the visitor location register (VLR) assigns a roaming number (MSRN) , after waiting for the arrival of the initial address message (IAI) in the call connection message, initiate paging, because the user is not in the service area, the paging fails, and the call also fails; 4) After the called user returns to the service area, initiate a location update notification Visitor location register (VLR); 5) at this time, if the location update is not in the same visitor location register (VLR), then in the location update process, the home location register (HLR) where the called subscriber (B) is located notifies the called subscriber (B) previously located visitor location register (VLR) deletes user data, and this visitor location register (VLR) finds that there is a call request to be completed, then utilizes the data preserved originally, initiates a short message to calling subscriber (A), will The called user (B) is notified of the availability of the caller (A). 10. The method for using short messages to assist call completion as claimed in any one of claims 1-3, characterized in that: the process is completed in the mobile network, and when the called user is busy, its The implementation process is as follows: 1) When the calling user (A) calls the called user (B), a call request is generated and completed; 2) When the roaming number (MSRN) is used, the visitor location register (VLR (B) where the called user (B) is located )) register the calling number and complete the call request in the visitor location register (VLR (B)); 3) after the call is connected to the called end office, the called user is busy and the call fails; 4) when the called user ( B) Complete the previous call and enter the idle state, the visitor location register (VLR (B)) where the called user (B) is located finds that there is a call completion request, then utilizes the original saved data to initiate a short message to user A , and notify the calling user (A) that the called user (B) can be connected.

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