WO2010078781A1

WO2010078781A1 - Ptt group talk control method, user terminal and network side device

Info

Publication number: WO2010078781A1
Application number: PCT/CN2009/075213
Authority: WO
Inventors: 刘作军
Original assignee: 华为终端有限公司
Priority date: 2008-12-29
Filing date: 2009-11-30
Publication date: 2010-07-15
Also published as: CN101459879A

Abstract

The embodiments of the invention disclose a Push-To-Talk PTT group talk control method, which comprises that a first control request message is sent to a network side device, while the first control request message carries a group identifier and the number of a user terminal; a first control response message returned by the network side device is received, while the first control response message carries a control state identifier for indicating the state of the user terminal. The embodiments of the invention disclose a user terminal and a network side device simultaneously. In the embodiments of the invention, after initiating a call, a master side can examine the state of each member in conversation in real-time, and control the talk group according to requirements during the call. The flexibility of PTT applications is improved, and PTT is suitable for broader application regions to satisfy application requirements of broader population.

Description

- PTT group call control method, user terminal and network side device This application claims to be submitted on December 29, 2008, the application number is 200810188019.8, and the invention name is "a PTT group call control method, system and device" Priority of the patent application, the entire contents of which is incorporated herein by reference. Technical field

The present invention relates to the field of communications technologies, and in particular, to a PTT group call control method, a user terminal, and a network side device. Background technique

PTT (Push To Talk) is a new application based on 3G networks and is a Voice over IP technology. Unlike traditional voice communication based on circuit switching, PTT implements voice communication in the form of digital exchange, converts voice signals into data packets and transmits them over the network, and finally converts the data packets into voice signals from the network side to complete a call. At the same time, since PTT is a kind of data application, data management can be used. For example, PTT users can establish a friend contact library, and can know who is talking, whether the contact object is in the service area, etc., and can also be extended. User-customized requirements. PTT can perform group multi-person conversations, and has the advantages of good signal quality and wide coverage, especially suitable for large-scale, large organizations and multi-populations.

In the process of implementing the present invention, the inventor has found that at least the following problems exist in the prior art: The current PTT group call can only perform group call only by setting a group in advance, and in particular, the application of the fixed group needs to be advanced on the network side. Settings, unable to achieve selective group calls through the mobile terminal. Moreover, once a group call is initiated, the members in the group cannot be effectively controlled in real time, and the status of the members in the group is invisible to other members, so the originating caller cannot know whether the members in the group are in this time. During the call, it will affect the effect of the group call. Summary of the invention

The embodiment of the invention provides a PTT group call control method, a user terminal and a network side device, so that the main control party can view the status of each member in the call in real time after the call is initiated, and can call the call during the call. Group control.

To achieve the above objective, an embodiment of the present invention provides a PTT group call control method, including:

Sending a first control request message to the network side device, where the first control request message carries the group identifier and the number of the user terminal;

Receiving a first control response message returned by the network side device, where the first control response message carries a control status identifier, where the control status identifier is used to indicate a status of the user terminal.

An embodiment of the present invention provides a PTT group call control method, including:

Receiving, by the master control user terminal, a first control request message, where the first control request message carries a group identifier and a number of the first user terminal;

And sending, according to the first control request message from the master user terminal, a second control request message to the first user terminal;

Receiving a second control response message returned by the first user terminal, where the second control response message carries state information of the first user terminal;

Returning, by the second control response message from the first user terminal, a first control response message to the control user terminal, where the first control response message carries a control status identifier, where the control status identifier is used to indicate The status of the first user terminal.

An embodiment of the present invention provides a user terminal, including:

a sending unit, configured to send a first control request message to the network side device, where the first control request message carries a group identifier and a number of another user terminal;

The receiving unit is configured to receive a first control response message that is returned by the network side device, where the first control response message carries a control status identifier, where the control status identifier is used to indicate a status of the another user terminal. The embodiment of the invention provides a network side device, including:

a first receiving unit, configured to receive a first control request message sent by the master user terminal, where the first control request message carries a group identifier and a number of the first user terminal;

a first sending unit, configured to send a second control request message to the first user terminal according to the first control request message received by the first receiving unit;

a second receiving unit, configured to receive a second control response message returned by the first user terminal, where the second response message carries status information of the first user terminal;

a second sending unit, configured to: return, according to the second control response message, a first control response message to the main control user terminal, where the first control response message carries a control status identifier, where the control status identifier is used to indicate The status of the first user terminal.

Compared with the prior art, the embodiment of the present invention has at least the following advantages:

In the embodiment of the present invention, the main controller can view the status of each member in the call in real time after initiating the call, and can control the call group as needed during the call, thereby enhancing the flexibility of the PTT application, so that the PTT can Suitable for a wider range of applications, to meet the needs of a wider range of people. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is merely some embodiments of the present invention, and those skilled in the art can obtain other drawings according to the drawings without any creative work.

1 is a flowchart of a group control of a master user terminal in an embodiment of the present invention; FIG. 2 is a flow chart of obtaining information of other user terminals in a group by a network side device according to an embodiment of the present invention;

3 is a flowchart of a user terminal that invites a user terminal not in a call to participate in the call in the embodiment of the present invention; 4 is a flowchart of a process in which a master user terminal cancels a user terminal that does not need to participate in a call to end the call in the embodiment of the present invention;

FIG. 5 is a flowchart of displaying group information of a master user terminal according to an embodiment of the present invention; FIG.

6 is a structural diagram of a PTT group call control system according to an embodiment of the present invention;

7 is a structural diagram of a user terminal according to an embodiment of the present invention;

FIG. 8 is a structural diagram of a network side device according to an embodiment of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

In the embodiment of the present invention, the user terminal receives the data from the network side device, and displays the user information of the current call; or adds a user to join the call or cancel the call of a certain user during the call. For example, during a call, a member who is not in the call needs to be invited to participate in the call, and the user can be selected and a call invitation can be sent to the user.

In the embodiment of the present invention, the main control user terminal controls the group, and the specific process is shown in FIG. 1 , which includes the following steps:

Step 101: The master control user terminal sends a first control request message to the network side device, where the first control request message carries the group identifier and the number of the first user terminal.

Step 102: The master control terminal receives the first control response message returned by the network side device, where the response message carries a control status identifier, where the control status identifier is used to indicate the status of the first user terminal.

The step 101 is specifically: sending an invite join message to the network side device, where the invite join message carries the group identifier and the number of the invited user terminal, that is, the first user terminal is the invited user terminal at this time; Step 102 Specifically: receiving a response message returned by the network side device, where The response message carries a join status identifier, where the join status identifier is used to indicate that the invited user terminal joins the group successfully or joins the group. In addition, the invite join message may further include a join type, which is used to indicate that the invited user terminal actively joins the group or passively joins the group.

The step 101 is specifically: sending a cancel call message to the network side device, where the cancel call message carries the group number and the cancelled user terminal number, that is, the first user terminal is the canceled user terminal; Step 102 is specifically: receiving a response message returned by the network side device, where the response message carries a cancellation status identifier, where the cancellation status identifier is used to indicate that the cancelled user terminal exits the group successfully or exits the group. failure.

Before the step 101, the method further includes: sending a request message to the network side device, where the message carries a group identifier; receiving a response message returned by the network side device, where the response message carries the group identifier corresponding to the group Other user terminal status information; display other user terminal status information in the group.

In the embodiment of the present invention, the master user terminal receives data from the network side device, and displays all user information in the current call group.

In the embodiment of the present invention, a PTT group call control method, as shown in FIG. 2, includes the following steps:

Step 201: The network side device receives a first control request message sent by the master user terminal, where the first control request message carries the group identifier and the number of the first user terminal.

Step 202: The network side device sends a second control request message to the first user terminal. Step 203: The network side device receives a second control response message returned by the first user terminal, where the response message carries State information of the first user terminal;

Step 204: The network side device returns a first control response message to the control user terminal, where the response message carries a control status identifier, where the control status identifier is used to indicate the status of the first user terminal.

The master user terminal invites other user terminals to join the group, that is, when the first user terminal is invited to join the user terminal of the group: Step 201 is specifically: receiving an invite join message sent by the master user terminal, where the invite join message carries a group identifier and a user terminal number invited to join the group;

The step 202 is specifically: sending an invitation to join the user to the invited user terminal. Step 203 is specifically: receiving the response message that is invited to join the user terminal, where the response message carries the invited user. Status information of the terminal;

Step 204 is specifically: returning the status information that is invited to join the user terminal to the master user terminal.

The invite join message may further include a join type, which is used to indicate that the invited user terminal actively joins the group or passively joins the group.

The master user terminal cancels the call of a user terminal in the group, that is, when the first user terminal is a user terminal that is canceled to join the group:

Step 201 is specifically: receiving a cancel call message sent by the master user terminal, where the cancel call message carries the group identifier and the number of the canceled user terminal;

Step 202 is specifically: sending, by the canceled user terminal in the group corresponding to the group identifier, the cancel call message;

Step 203 is specifically: receiving a response message returned by the canceled user terminal, where the response message carries state information of the canceled user terminal;

Step 204 is specifically: returning status information of the canceled user terminal to the master user terminal.

Before the step 201, the method further includes: receiving a request message sent by the master user terminal, where the message carries a group identifier; and returning a response message to the master user terminal, where the response message carries the group corresponding to the group identifier Status information of other user terminals in the group.

In the embodiment of the present invention, the master user terminal invites the user terminal that is not in the call to participate in the call, as shown in FIG. 3, and includes the following steps:

Step 301: The master user terminal MS receives a PTT Cal l connect notify message sent by the network side device (BS). Step 302: The MS sends a PTT Group update Req message to the network side device (BS). In step 303, the master user terminal receives the PTT Group update ACK message from the network side device, and completes the master user terminal and the network side device (BS). Group information update between;

The master user terminal can obtain the status of other user terminals in the group by parsing the PTT Group update ACK.

Step 304: The master user terminal in the call group sends a PTT Invite Req message to the network side device (BS), where the message carries the following information:

GroupID = group ID; DesNo = invited party number;

MsgType = Invite to join information; JoinType = Join type, including active join or passive join;

Step 305: The network side device receives the message sent by the master user terminal, and sends a late PTT Join later notify message to the invited user terminal, where the message carries the following information:

GroupID = group ID; JoinType = join type, including active join or passive join;

Step 306: The invited user terminal processes the late access. If the active user joins, the invited user terminal may choose to join or not join; if the passive join, the invited user terminal automatically joins the call. And returning a late access notification PTT Join later notify ACK message to the network side device, the message includes whether the call information is successfully joined, and is identified by the join status PTT JOIN STATUS, PTT JOIN STATUS is 0 for failure, and PTT JOIN STATUS is 1 for Success

Step 307: The network side device sends a status message PTT Invite ACK to the master user terminal, where the message includes the number of the invitee, DesNo, and JOIN STATUS, the JOIN STATUS is 0, indicating that the JOIN STATUS is 1 indicates success.

Step 308: The master user terminal updates the status of the user terminal in the group according to the return status information. In the embodiment of the present invention, the master user terminal can view the status of each member in the call in real time after initiating the call, and can invite the user terminal not in the call to participate in the call, and enhance the call.

The flexibility of PTT applications allows PTT to be applied to a wider range of applications to meet the needs of a wider range of people.

In the embodiment of the present invention, the master user cancels the call by the user terminal that does not need to participate in the call through the master user terminal, as shown in FIG. 4, and includes the following steps:

Step 401: The master user terminal MS receives a PTT Cal l connect notify message sent by the network side device (BS).

Step 402: The master user terminal MS sends a PTT Group update Req message to the network side device (BS).

Step 403: The master user terminal MS receives a PTT Group update ACK message from the network side device, and completes group information update between the master user terminal and the network side device (BS).

Step 404: The master user terminal MS sends a PTT Cancel talking Req message to the network side device; the message carries the following information:

GroupID = group ID; DesNo = canceled party number;

MsgType = cancel the call message;

Step 405: The network side device parses the message, and sends a PTT Quit notify message to the user terminal in the group that needs to be canceled, and interrupts the call of the canceled user terminal.

Step 406: The canceled user terminal returns a PTT Quit notify ACK to the network side device, where the message includes information indicating whether the cancellation is successful, and is identified by Cancel status, where Cancel status is 0, and Cancel status is 1;

Step 407: The network side device returns a cancel call message PTT Cancel talking ACK to the master user terminal, where the message includes the invitee's number DesNo, and the Cancel status, the Cancel status is 0, the table does not fail, and the Cancel status is 1 table is unsuccessful. ; Step 408: The master user terminal updates the status of the user terminal in the group according to the return status information.

In the embodiment of the present invention, the master user terminal can view the status of each member in the call in real time after the call is initiated, and the master controller can cancel the user terminal that does not need to participate in the call to end the call, and enhance the flexibility of the PTT application. Sexuality enables PTT to be applied to a wider range of applications to meet the needs of a wider range of people.

In the embodiment of the present invention, after receiving the PTT Group update ACK from the network side device, the main control user terminal displays the group information, and the process is as shown in FIG. 5, which includes the following steps:

Step 501: The master user terminal receives the PTT Group update ACK message.

Step 502: The master user terminal parses the PTT Group update ACK message, and separates the message header by extracting the message header;

Step 503, the master user terminal determines whether the parsing is successful, if successful, then proceeds to step 504, otherwise to step 505;

Step 504: The master user terminal invokes the display module to display the parsed group information. In step 505, the master user terminal prompts the user to update the group information.

The embodiment of the present invention provides a PTT group call control system. As shown in FIG. 6, the method includes: a master control user terminal 610, configured to send a first control request message to the network side device 620, where the message carries a group identifier and The number of the first user terminal is received; the first control response message returned by the network side device 620 is received, where the response message carries a control status identifier, where the control status identifier is used to indicate the status of the first user terminal; Receiving a first control request message sent by the master user terminal, the message carrying the group identifier and the number of the first user terminal; sending a second control request message to the first user terminal according to the first control request message, and receiving the message a second control response message returned by the user terminal, where the response message carries status information of the first user terminal, and returns a first control response message to the control user terminal according to the second control response message, where the response message is And carrying a control status identifier, where the control status identifier is used to indicate a status of the first user terminal. The embodiment of the invention provides a user terminal, which is a master user terminal, as shown in the figure.

And the sending unit 710 is configured to: send, by the sending unit 710, a first control request message to the network side device, where the first control request message carries the group identifier and the number of another user terminal, where the other user terminal is the foregoing a user terminal; the receiving unit 720, configured to receive a first control response message returned by the network side device, where the response message carries a control status identifier, where the control status identifier is used to indicate a status of the another user terminal.

among them,

The sending unit 710 includes a first sending unit, configured to send an invite adding message to the network side device, where the message carries the group identifier and the number of the invited user terminal;

The receiving unit 720 includes a first receiving unit, configured to receive a response message returned by the network side device, where the response message carries a join status identifier, where the join status identifier is used to indicate that the invited user terminal joins the group successfully or joins the group.

among them,

The sending unit 710 includes a second sending unit, configured to send a cancel call message to the network side device, where the message carries the group number and the cancelled user terminal number;

The receiving unit 720 includes a second receiving unit, configured to receive a response message returned by the network side device, where the response message carries a cancellation status identifier, where the cancellation status identifier is used to indicate that the canceled user terminal exits the group successfully or exits the group.

among them,

The sending unit 710 includes a third sending unit, configured to send a request message to the network side device, where the message carries the group identifier.

The receiving unit 720 includes a third receiving unit, configured to receive a response message returned by the network side device, where the response message carries other user terminal status information in the group corresponding to the group identifier;

The user terminal also includes: The parsing unit 730 is configured to parse status information of other user terminals in the group in the response message received by the receiving unit 720;

The display unit 740 is configured to display other user terminal status in the group parsed by the parsing unit 730.

The embodiment of the present invention provides a network side device, as shown in FIG. 8, including: a first receiving unit 810, configured to receive a first control request message sent by a master control user terminal, where the first control request message carries a group a group identifier and a number of the first user terminal; the first sending unit 820, configured to send a second control request message to the first user terminal according to the first control request message received by the first receiving unit; 830, configured to receive a second control response message returned by the first user terminal, where the response message carries state information of the first user terminal, and a second sending unit 840, configured to send, according to the second control response message, The master control terminal returns a first control response message, where the response message carries a control status identifier, where the control status identifier is used to indicate the status of the first user terminal.

among them,

The first receiving unit 810 includes a first receiving subunit, configured to receive an invite joining message sent by the controlling user terminal, where the invite joining message carries a group identifier and a number that is invited to join the user terminal;

The first sending unit 820 includes a first sending subunit, configured to send an invite joining message to the invited joining user terminal in the corresponding group of the group identifier;

The second receiving unit 830 includes a second receiving subunit, configured to receive the response message that is invited to join the user terminal, where the response message carries the status information that is invited to join the user terminal.

The second sending unit 840 includes a second sending subunit, and is configured to return the status information that is invited to join the user terminal to the controlling user terminal.

among them, The first receiving unit 810 includes a third receiving subunit, configured to receive a cancel call message sent by the master user terminal, where the cancel call message carries the group identifier and the number of the canceled user terminal;

The first sending unit 820 includes a third sending subunit, configured to send the canceled call message to the canceled user terminal in the group identifier corresponding group;

The second receiving unit 830 includes a fourth receiving subunit, configured to receive a response message returned by the canceled user terminal, where the response message carries state information of the canceled user terminal, and the second sending unit 840 includes And a fourth sending subunit, configured to return status information of the canceled user terminal to the master user terminal.

In the embodiment of the present invention, the master user terminal can view the status of each member in the call in real time after initiating the call, and can control the call group according to the need during the call, thereby enhancing the flexibility of the PTT application and making the PTT Can be applied to a wider range of applications to meet the needs of a wider range of people. In addition, the master controller can cancel the user terminal that does not need to participate in the call to end the call, or invite the user terminal not in the call to participate in the call.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by hardware, or can be implemented by means of software plus necessary general hardware platform, and the technical solution of the present invention can be implemented. Reflected in the form of a software product, the software product can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for making a computer device (may be A personal computer, server, or network device, etc.) performs the methods described in various embodiments of the present invention.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims

Claim

A push-to-talk PTT group call control method, comprising:

The method according to claim 1, wherein the first control request message is sent to the network side device, where the first control request message carries the group identifier and the number of the user terminal, specifically:

Sending an invite join message to the network side device, where the invite join message carries the group identifier and the number of the invited user terminal;

And receiving, by the network side device, a first control response message, where the first control response message carries a control status identifier, where the control status identifier is used to indicate a status of the user terminal, specifically:

Receiving a response message returned by the network side device, where the response message carries a join status identifier, where the join status identifier is used to indicate that the invited user terminal joins the group successfully or joins the group failure.

The method according to claim 2, wherein the invitation to join message further includes a join type, which is used to indicate that the invited user terminal actively joins the group or passively joins the group.

Sending a cancel call message to the network side device, where the cancel call message carries a group number and a canceled user terminal number; And receiving, by the network side device, a first control response message, where the first control response message carries a control status identifier, where the control status identifier is used to indicate a status of the user terminal, specifically:

Receiving a response message returned by the network side device, where the response message carries a cancellation status identifier, where the cancellation status identifier is used to indicate that the canceled user terminal fails to exit the group successfully or exits the group.

The method according to claim 1, wherein before the sending the first control request message to the network side device, the method further includes:

Sending a request message to the network side device, where the request message carries a group identifier;

Receiving a response message returned by the network side device, where the response message carries state information of other user terminals in the group corresponding to the group identity;

Display other user terminal status information in the group.

6. A PTT group call control method, comprising:

The method of claim 6, wherein the receiving, by the master control user terminal, the first control request message, the first control request message carries a group identifier and a number of the first user terminal, specifically for: Receiving an invitation joining message sent by the master user terminal, where the invitation joining message carries the group identifier and the user terminal number invited to join the group;

Sending, by the first user terminal, a second control request message, specifically:

Sending an invitation to join message to the invited user terminal in the group corresponding to the group identity; receiving the second control response message returned by the first user terminal, where the second control response message carries the first user The status information of the terminal is specifically as follows:

Receiving the response message that is invited to join the user terminal, where the response message carries the status information that is invited to join the user terminal;

Returning the first control response message to the main control user terminal, specifically:

Returning the status information invited to the user terminal to the master user terminal.

The method of claim 7, wherein the invitation to join message further includes a join type, which is used to indicate that the invited user terminal actively joins the group or passively joins the group.

The method according to claim 6, wherein the receiving the first control request message sent by the master user terminal, the first control request message carrying the group identifier and the number of the first user terminal, specifically For:

Receiving a cancel call message sent by the master user terminal, where the cancel call message carries the group identifier and the number of the canceled user terminal;

Sending, by the first user terminal, the second control request message, specifically:

Sending the cancel call message to the canceled user terminal in the corresponding group of the group identifier; receiving the second control response message returned by the first user terminal, where the second control response message carries the The status information of the first user terminal is specifically:

Receiving a response message returned by the canceled user terminal, where the response message carries state information of the canceled user terminal;

Returning the status information of the canceled user terminal to the master user terminal.

The method of claim 6, wherein the receiving the first control request message sent by the master user terminal further comprises:

Receiving a request message sent by the master user terminal, where the request message carries a group identifier, and returns a response message to the master user terminal, where the response message carries other user terminals in the group corresponding to the group identifier. status information.

11. A user terminal, comprising:

And a receiving unit, configured to receive a first control response message returned by the network side device, where the first control response message carries a control status identifier, where the control status identifier is used to indicate a status of the another user terminal.

12. The user terminal of claim 11 wherein:

The sending unit includes a first sending unit, configured to send an invite adding message to the network side device, where the invite joining message carries a group identifier and a number of the invited user terminal;

The receiving unit includes a first receiving unit, configured to receive a response message returned by the network side device, where the response message carries a join status identifier, where the join status identifier is used to indicate that the invited user terminal joins the group successfully. Or failed to join the group.

13. The user terminal of claim 11 wherein:

The sending unit includes a second sending unit, configured to send a cancel call message to the network side device, where the cancel call message carries a group number and a canceled user terminal number;

The receiving unit includes a second receiving unit, configured to receive a response message returned by the network side device, where the response message carries a cancellation status identifier, where the cancellation status identifier is used to indicate that the cancelled user terminal exits the group The group failed to successfully or exit the group.

14. The user terminal of claim 11 wherein:

The sending unit includes a third sending unit, configured to send a request message to the network side device, where the request message carries a group identifier; The receiving unit, including a third receiving unit, is configured to receive a response message returned by the network side device, where the response message carries state information of other user terminals in the group corresponding to the group identifier;

The user terminal further includes:

a parsing unit, configured to parse other user terminal status information in the group in the response message received by the receiving unit;

And a display unit, configured to display other user terminal status information in the group parsed by the parsing unit.

15. A network side device, comprising:

a first sending unit, configured to send, according to the first control request message received by the first receiving unit, a second control request message to the first user terminal;

a second receiving unit, configured to receive a second control response message that is returned by the first user terminal, where the second control response message carries status information of the first user terminal;

16. The network side device according to claim 15, wherein:

The first receiving unit includes a first receiving subunit, configured to receive an invite join message sent by the master user terminal, where the invite join message carries a group identifier and a number that is invited to join the user terminal;

The first sending unit includes a first sending subunit, configured to send an invite joining message to the invited user terminal in the group corresponding to the group identifier; The second receiving unit, including a second receiving subunit, is configured to receive the response message that is invited to join the user terminal, where the response message carries the status information that is invited to join the user terminal;

The second sending unit includes a second sending subunit, configured to return the status information that is invited to join the user terminal to the controlling user terminal.

17. The network side device according to claim 15, wherein:

The first receiving unit includes a third receiving subunit, configured to receive a cancel call message sent by the master user terminal, where the cancel call message carries a group identifier and a number of the canceled user terminal;

The first sending unit includes a third sending subunit, configured to send the canceled call message to the canceled user terminal in the group identifier corresponding group;

The second receiving unit, including a fourth receiving subunit, is configured to receive a response message returned by the canceled user terminal, where the response message carries state information of the canceled user terminal; And including a fourth sending subunit, configured to return status information of the canceled user terminal to the master user terminal.