Method for regrouping multiple groups and device

TECHNICAL FIELD

0001Embodiments of the present invention relate to the field of communications technologies, and in particular, to a method for regrouping multiple groups and a device.

BACKGROUND

0002In actual application, there is a requirement, that is, an authorized mission critical push to talk (English: Mission critical push to talk over, MCPTT for short) user may temporarily group several MCPTT groups into a temporary group. For example, in some emergencies, a fire department and a public security department work together, and an on-scene commander may need to temporarily group the two MCPTT groups of the fire department and the public security department into a new large group. This MCPTT group regrouping function cannot be supported in the prior art yet.

SUMMARY

0003Embodiments of the present invention provide a method for regrouping multiple groups and a device, to enable mutual communication between user equipments (English: User Equipment, UE for short) used by MCPTT users in multiple MCPTT groups.

0004According to a first aspect, an embodiment of the present invention provides a method for regrouping multiple groups, including: <ul id="ul0001" list-style="none" compact="compact"><li>receiving, by a first group management functional entity, a group regrouping creation message sent by first UE, where the group regrouping creation message includes identifiers of N MCPTT groups, and the group regrouping creation message is used to request the first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped; the first group management functional entity is a group management functional entity in a home network of the first MCPTT user; and the first MCPTT user belongs to at least one MCPTT group of the N MCPTT groups; and</li><li>configuring, by the first group management functional entity, information about the temporary group, where the information about the temporary group includes: an identifier of the temporary group into which the N MCPTT groups are regrouped, and the identifiers of the N MCPTT groups.</li></ul>

0005In a first possible implementation of the first aspect, after the configuring, by the first group management functional entity, information about the temporary group, the method further includes: sending, by the first group management functional entity, a group regrouping complete message to the first UE.

0006With reference to the first aspect or the first possible implementation of the first aspect, in a second possible implementation of the first aspect, the information about the temporary group further includes at least one of the following: information about an MCPTT user in at least one MCPTT group of the N MCPTT groups, a priority of the temporary group, or a security level of the temporary group.

0007With reference to the first aspect or the first possible implementation of the first aspect or the second possible implementation of the first aspect, in a third possible implementation of the first aspect, the N MCPTT groups are MCPTT groups managed by the first group management functional entity.

0008With reference to the first aspect or the first possible implementation of the first aspect or the second possible implementation of the first aspect, in a fourth possible implementation of the first aspect, a first MCPTT group of the N MCPTT groups is not an MCPTT group managed by the first group management functional entity, and the first MCPTT group is at least one MCPTT group of the N MCPTT groups; before the configuring, by the first group management functional entity, information about the temporary group, the method further includes: <ul id="ul0002" list-style="none" compact="compact"><li>sending, by the first group management functional entity, the group regrouping creation message to a second group management functional entity, where the second group management functional entity is any group management functional entity that manages at least one MCPTT group of the first MCPTT group; and</li><li>receiving, by the first group management functional entity, a group regrouping response message sent by the second group management functional entity; and</li><li>the configuring, by the first group management functional entity, information about the temporary group includes: configuring, by the first group management functional entity, the information about the temporary group according to the group regrouping response message.</li></ul>

0009With reference to the fourth possible implementation of the first aspect, in a fifth possible implementation of the first aspect, the group regrouping response message further includes information about an MCPTT user in the at least one MCPTT group that is of the first MCPTT group and that is managed by the second group management functional entity.

0010With reference to the first aspect or any one of the first to the fifth possible implementations of the first aspect, in a sixth possible implementation of the first aspect, after the configuring, by the first group management functional entity, information about the temporary group, the method further includes: sending, by the first group management functional entity, group regrouping information to second UE, where the group regrouping information includes the identifier of the temporary group, the second UE is UE used by a second MCPTT user, and the second MCPTT user is any MCPTT user in the N MCPTT groups.

0011With reference to the sixth possible implementation of the first aspect, in a seventh possible implementation of the first aspect, when an MCPTT group to which the second MCPTT user belongs is not an MCPTT group managed by the first group management functional entity, the sending, by the first group management functional entity, group regrouping information to second UE includes: sending, by the first group management functional entity, the group regrouping information to a group management functional entity of the MCPTT group to which the second MCPTT user belongs, so that the group management functional entity of the MCPTT group to which the second MCPTT user belongs sends the group regrouping information to the second UE.

0012With reference to the sixth possible implementation of the first aspect or the seventh possible implementation of the first aspect, in an eighth possible implementation of the first aspect, the method further includes: <ul id="ul0003" list-style="none" compact="compact"><li>receiving, by the first group management functional entity, a group regrouping release message sent by the first UE, where the group regrouping release message includes the identifier of the temporary group, and the group regrouping release message is used to request the first group management functional entity to release the temporary group according to the identifier of the temporary group; and</li><li>sending, by the first group management functional entity, group regrouping release notification information to the second UE according to the group regrouping release message, where</li><li>the group regrouping release notification information includes the identifier of the temporary group; and the group regrouping release notification information is used to instruct the second UE to delete the group regrouping information according to the identifier of the temporary group.</li></ul>

0013With reference to the eighth possible implementation of the first aspect, in a ninth possible implementation of the first aspect, when an MCPTT group to which the second MCPTT user belongs is not an MCPTT group managed by the first group management functional entity, the sending, by the first group management functional entity, group regrouping release notification information to the second UE according to the group regrouping release message includes: sending, by the first group management functional entity according to the group regrouping release message, the group regrouping release notification information to a group management functional entity of the MCPTT group to which the second MCPTT user belongs, so that the group management functional entity of the MCPTT group to which the second MCPTT user belongs sends the group regrouping release notification information to the second UE.

0014With reference to the eighth possible implementation of the first aspect or the ninth possible implementation of the first aspect, in a tenth possible implementation of the first aspect, after the receiving, by the first group management functional entity, a group regrouping release message sent by the first UE, the method further includes: deleting, by the first group management functional entity, the information about the temporary group.

0015According to a second aspect, an embodiment of the present invention provides a method for regrouping multiple groups, including: <ul id="ul0004" list-style="none" compact="compact"><li>generating, by first UE, a group regrouping creation message, where the group regrouping creation message includes identifiers of N MCPTT groups, and the group regrouping creation message is used to request a first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped, where N is an integer greater than or equal to 2; the first MCPTT user belongs to at least one MCPTT group of the N MCPTT groups; and the first group management functional entity is a group function management entity in a home network of the first MCPTT user; and</li><li>sending, by the first UE, the group regrouping creation message to the first group management functional entity.</li></ul>

0016In a first possible implementation of the second aspect, after the sending, by the first UE, the group regrouping creation message to the first group management functional entity, the method further includes: receiving, by the first UE, a group regrouping complete message sent by the first group management functional entity.

0017With reference to the second aspect or the first possible implementation of the second aspect, in a second possible implementation of the second aspect, after the sending, by the first UE, the group regrouping creation message to the first group management functional entity, the method further includes: receiving, by the first UE, group regrouping information sent by the first group management functional entity, where the group regrouping information includes an identifier of the temporary group.

0018With reference to the second aspect or the first possible implementation of the second aspect or the second possible implementation of the second aspect, in a third possible implementation of the second aspect, after the sending, by the first UE, the group regrouping creation message to the first group management functional entity, the method further includes: <ul id="ul0005" list-style="none" compact="compact"><li>sending, by the first UE, a group regrouping release message to the first group management functional entity, where the group regrouping release message includes the identifier of the temporary group, and the group regrouping release message is used to request the first group management functional entity to release the temporary group according to the identifier of the temporary group;</li><li>receiving, by the first UE, group regrouping release notification information sent by the first group management functional entity, where the group regrouping release notification information includes the identifier of the temporary group; and</li><li>deleting, by the first UE, the group regrouping information according to the identifier of the temporary group in the group regrouping release notification information.</li></ul>

0019According to a third aspect, an embodiment of the present invention provides a method for regrouping multiple groups, including: <ul id="ul0006" list-style="none" compact="compact"><li>receiving, by a second group management functional entity, a group regrouping creation message that is sent by first UE and that is forwarded by a first group management functional entity, where the group regrouping creation message includes identifiers of N MCPTT groups, the group regrouping creation message is used to request the first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped, and the second group management functional entity manages at least one MCPTT group of the N MCPTT groups; the first group management functional entity is a group management functional entity in a home network of the first MCPTT user; and the first MCPTT user belongs to at least one MCPTT group of the N MCPTT groups; and</li><li>sending, by the second group management functional entity, a group regrouping response message to the first group management functional entity.</li></ul>

0020In a first possible implementation of the third aspect, the group regrouping response message further includes information about an MCPTT user in the at least one MCPTT group that is of the N MCPTT groups and that is managed by the second group management functional entity.

0021With reference to the third aspect or the first possible implementation of the third aspect, in a second possible implementation of the third aspect, after the sending, by the second group management functional entity, a group regrouping response message to the first group management functional entity, the method further includes: <ul id="ul0007" list-style="none" compact="compact"><li>receiving, by the second group management functional entity, group regrouping information sent by the first group management functional entity, where the group regrouping information includes an identifier of the temporary group; and</li><li>sending, by the second group management functional entity, the group regrouping information to second UE, where the second UE is UE used by a second MCPTT user, and the second MCPTT user is any MCPTT user in the at least one MCPTT group that is of the N MCPTT groups and that is managed by the second group management functional entity.</li></ul>

0022With reference to the second possible implementation of the third aspect, in a third possible implementation of the third aspect, the method further includes: <ul id="ul0008" list-style="none" compact="compact"><li>receiving, by the second group management functional entity, group regrouping release notification information sent by the first group management functional entity, where the group regrouping release notification information includes the identifier of the temporary group; and the group regrouping release notification information is used to instruct to delete the group regrouping information according to the identifier of the temporary group; and</li><li>sending, by the second group management functional entity, the group regrouping release notification information to the second UE.</li></ul>

0023With reference to the third possible implementation of the third aspect, in a fourth possible implementation of the third aspect, after the receiving, by the second group management functional entity, group regrouping release notification information sent by the first group management functional entity, the method further includes: deleting, by the second group management functional entity, the group regrouping information.

0024According to a fourth aspect, an embodiment of the present invention provides a group management functional entity, used as a first group management functional entity, including: <ul id="ul0009" list-style="none" compact="compact"><li>a transceiver unit, configured to receive a group regrouping creation message sent by first UE, where the group regrouping creation message includes identifiers of N MCPTT groups, and the group regrouping creation message is used to request the first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped; the first group management functional entity is a group management functional entity in a home network of the first MCPTT user; and the first MCPTT user belongs to at least one MCPTT group of the N MCPTT groups; and</li><li>a processing unit, configured to configure information about the temporary group, where the information about the temporary group includes: an identifier of the temporary group into which the N MCPTT groups are regrouped, and the identifiers of the N MCPTT groups.</li></ul>

0025In a first possible implementation of the fourth aspect, the transceiver unit is further configured to: after the processing unit configures the information about the temporary group, send a group regrouping complete message to the first UE.

0026With reference to the fourth aspect or the first possible implementation of the fourth aspect, in a second possible implementation of the fourth aspect, the information about the temporary group further includes at least one of the following: information about an MCPTT user in at least one MCPTT group of the N MCPTT groups, a priority of the temporary group, or a security level of the temporary group.

0027With reference to the fourth aspect or the first possible implementation of the fourth aspect or the second possible implementation of the fourth aspect, in a third possible implementation of the fourth aspect, the N MCPTT groups are MCPTT groups managed by the first group management functional entity.

0028With reference to the fourth aspect or the first possible implementation of the fourth aspect or the second possible implementation of the fourth aspect, in a fourth possible implementation of the fourth aspect, a first MCPTT group of the N MCPTT groups is not an MCPTT group managed by the first group management functional entity, and the first MCPTT group is at least one MCPTT group of the N MCPTT groups; the transceiver unit is further configured to: before the processing unit configures the information about the temporary group, send the group regrouping creation message to a second group management functional entity, where the second group management functional entity is any group management functional entity that manages at least one MCPTT group of the first MCPTT group; and receive a group regrouping response message sent by the second group management functional entity; and when configuring the information about the temporary group, the processing unit is specifically configured to configure the information about the temporary group according to the group regrouping response message.

0029With reference to the fourth possible implementation of the fourth aspect, in a fifth possible implementation of the fourth aspect, the group regrouping response message further includes information about an MCPTT user in the at least one MCPTT group that is of the first MCPTT group and that is managed by the second group management functional entity.

0030With reference to the fourth aspect or any one of the first to the fifth possible implementations of the fourth aspect, in a sixth possible implementation of the fourth aspect, the transceiver unit is further configured to: after the processing unit configures the information about the temporary group, send group regrouping information to second UE, where the group regrouping information includes the identifier of the temporary group, the second UE is UE used by a second MCPTT user, and the second MCPTT user is any MCPTT user in the N MCPTT groups.

0031With reference to the sixth possible implementation of the fourth aspect, in a seventh possible implementation of the fourth aspect, when an MCPTT group to which the second MCPTT user belongs is not an MCPTT group managed by the first group management functional entity, when sending the group regrouping information to the second UE, the transceiver unit is specifically configured to send the group regrouping information to a group management functional entity of the MCPTT group to which the second MCPTT user belongs, so that the group management functional entity of the MCPTT group to which the second MCPTT user belongs sends the group regrouping information to the second UE.

0032With reference to the sixth possible implementation of the fourth aspect or the seventh possible implementation of the fourth aspect, in an eighth possible implementation of the fourth aspect, the transceiver unit is further configured to: receive a group regrouping release message sent by the first UE, where the group regrouping release message includes the identifier of the temporary group, and the group regrouping release message is used to request the first group management functional entity to release the temporary group according to the identifier of the temporary group; and send group regrouping release notification information to the second UE according to the group regrouping release message, where the group regrouping release notification information includes the identifier of the temporary group; and the group regrouping release notification information is used to instruct the second UE to delete the group regrouping information according to the identifier of the temporary group.

0033With reference to the eighth possible implementation of the fourth aspect, in a ninth possible implementation of the fourth aspect, when an MCPTT group to which the second MCPTT user belongs is not an MCPTT group managed by the first group management functional entity, when sending the group regrouping release notification information to the second UE according to the group regrouping release message, the transceiver unit is specifically configured to send, according to the group regrouping release message, the group regrouping release notification information to a group management functional entity of the MCPTT group to which the second MCPTT user belongs, so that the group management functional entity of the MCPTT group to which the second MCPTT user belongs sends the group regrouping release notification information to the second UE.

0034With reference to the eighth possible implementation of the fourth aspect or the ninth possible implementation of the fourth aspect, in a tenth possible implementation of the fourth aspect, the processing unit is further configured to: after the transceiver unit receives the group regrouping release message sent by the first UE, delete the information about the temporary group.

0035According to a fifth aspect, an embodiment of the present invention provides UE, used as first UE, including: <ul id="ul0010" list-style="none" compact="compact"><li>a processing unit, configured to generate a group regrouping creation message, where the group regrouping creation message includes identifiers of N MCPTT groups, and the group regrouping creation message is used to request a first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped, where N is an integer greater than or equal to 2; the first MCPTT user belongs to at least one MCPTT group of the N MCPTT groups; and the first group management functional entity is a group function management entity in a home network of the first MCPTT user; and</li><li>a transceiver unit, configured to send the group regrouping creation message to the first group management functional entity.</li></ul>

0036In a first possible implementation of the fifth aspect, the transceiver unit is further configured to: after sending the group regrouping creation message to the first group management functional entity, receive a group regrouping complete message sent by the first group management functional entity.

0037With reference to the fifth aspect or the first possible implementation of the fifth aspect, in a second possible implementation of the fifth aspect, the transceiver unit is further configured to: after sending the group regrouping creation message to the first group management functional entity, receive group regrouping information sent by the first group management functional entity, where the group regrouping information includes an identifier of the temporary group.

0038With reference to the fifth aspect or the first possible implementation of the fifth aspect or the second possible implementation of the fifth aspect, in a third possible implementation of the fifth aspect, the transceiver unit is further configured to: after sending the group regrouping creation message to the first group management functional entity, send a group regrouping release message to the first group management functional entity, where the group regrouping release message includes the identifier of the temporary group, and the group regrouping release message is used to request the first group management functional entity to release the temporary group according to the identifier of the temporary group; and receive group regrouping release notification information sent by the first group management functional entity, where the group regrouping release notification information includes the identifier of the temporary group; and the processing unit is further configured to delete the group regrouping information according to the identifier of the temporary group in the group regrouping release notification information.

0039According to a sixth aspect, an embodiment of the present invention provides a group management functional entity, used as a second group management functional entity, including: <ul id="ul0011" list-style="none" compact="compact"><li>a receiving unit, configured to receive a group regrouping creation message that is sent by first UE and that is forwarded by a first group management functional entity, where the group regrouping creation message includes identifiers of N MCPTT groups, the group regrouping creation message is used to request the first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped, and the second group management functional entity manages at least one MCPTT group of the N MCPTT groups; the first group management functional entity is a group management functional entity in a home network of the first MCPTT user; and the first MCPTT user belongs to at least one MCPTT group of the N MCPTT groups; and</li><li>a sending unit, configured to send a group regrouping response message to the first group management functional entity.</li></ul>

0040In a first possible implementation of the sixth aspect, the group regrouping response message further includes information about an MCPTT user in the at least one MCPTT group that is of the N MCPTT groups and that is managed by the second group management functional entity.

0041With reference to the sixth aspect or the first possible implementation of the sixth aspect, in a second possible implementation of the sixth aspect, the receiving unit is further configured to: after the sending unit sends the group regrouping response message to the first group management functional entity, receive group regrouping information sent by the first group management functional entity, where the group regrouping information includes an identifier of the temporary group; and the sending unit is further configured to send the group regrouping information to second UE, where the second UE is UE used by a second MCPTT user, and the second MCPTT user is any MCPTT user in the at least one MCPTT group that is of the N MCPTT groups and that is managed by the second group management functional entity.

0042With reference to the second possible implementation of the sixth aspect, in a third possible implementation of the sixth aspect, the receiving unit is further configured to receive group regrouping release notification information sent by the first group management functional entity, where the group regrouping release notification information includes the identifier of the temporary group; and the group regrouping release notification information is used to instruct to delete the group regrouping information according to the identifier of the temporary group; and the sending unit is further configured to send the group regrouping release notification information to the second UE.

0043With reference to the third possible implementation of the sixth aspect, in a fourth possible implementation of the sixth aspect, the group management functional entity further includes: a processing unit, configured to: after the receiving unit receives the group regrouping release notification information sent by the first group management functional entity, delete the group regrouping information.

0044According to a seventh aspect, an embodiment of the present invention provides a group management functional entity, used as a first group management functional entity, including: <ul id="ul0012" list-style="none" compact="compact"><li>a transceiver, configured to receive a group regrouping creation message sent by first UE, where the group regrouping creation message includes identifiers of N MCPTT groups, and the group regrouping creation message is used to request the first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped; the first group management functional entity is a group management functional entity in a home network of the first MCPTT user; and the first MCPTT user belongs to at least one MCPTT group of the N MCPTT groups; and</li><li>a processor, configured to configure information about the temporary group, where the information about the temporary group includes: an identifier of the temporary group into which the N MCPTT groups are regrouped, and the identifiers of the N MCPTT groups.</li></ul>

0045In a first possible implementation of the seventh aspect, the transceiver is further configured to: after the processor configures the information about the temporary group, send a group regrouping complete message to the first UE.

0046With reference to the seventh aspect or the first possible implementation of the seventh aspect, in a second possible implementation of the seventh aspect, the information about the temporary group further includes at least one of the following: information about an MCPTT user in at least one MCPTT group of the N MCPTT groups, a priority of the temporary group, or a security level of the temporary group.

0047With reference to the seventh aspect or the first possible implementation of the seventh aspect or the second possible implementation of the seventh aspect, in a third possible implementation of the seventh aspect, the N MCPTT groups are MCPTT groups managed by the first group management functional entity.

0048With reference to the seventh aspect or the first possible implementation of the seventh aspect or the second possible implementation of the seventh aspect, in a fourth possible implementation of the seventh aspect, a first MCPTT group of the N MCPTT groups is not an MCPTT group managed by the first group management functional entity, and the first MCPTT group is at least one MCPTT group of the N MCPTT groups; the transceiver is further configured to: before the processor configures the information about the temporary group, send the group regrouping creation message to a second group management functional entity, where the second group management functional entity is any group management functional entity that manages at least one MCPTT group of the first MCPTT group; and receive a group regrouping response message sent by the second group management functional entity; and when configuring the information about the temporary group, the processor is specifically configured to configure the information about the temporary group according to the group regrouping response message.

0049With reference to the fourth possible implementation of the seventh aspect, in a fifth possible implementation of the seventh aspect, the group regrouping response message further includes information about an MCPTT user in the at least one MCPTT group that is of the first MCPTT group and that is managed by the second group management functional entity.

0050With reference to the seventh aspect or any one of the first to the fifth possible implementations of the seventh aspect, in a sixth possible implementation of the seventh aspect, the transceiver is further configured to: after the processor configures the information about the temporary group, send group regrouping information to second UE, where the group regrouping information includes the identifier of the temporary group, the second UE is UE used by a second MCPTT user, and the second MCPTT user is any MCPTT user in the N MCPTT groups.

0051With reference to the sixth possible implementation of the seventh aspect, in a seventh possible implementation of the seventh aspect, when an MCPTT group to which the second MCPTT user belongs is not an MCPTT group managed by the first group management functional entity, when sending the group regrouping information to the second UE, the transceiver is specifically configured to send the group regrouping information to a group management functional entity of the MCPTT group to which the second MCPTT user belongs, so that the group management functional entity of the MCPTT group to which the second MCPTT user belongs sends the group regrouping information to the second UE.

0052With reference to the sixth possible implementation of the seventh aspect or the seventh possible implementation of the seventh aspect, in an eighth possible implementation of the seventh aspect, the transceiver is further configured to: receive a group regrouping release message sent by the first UE, where the group regrouping release message includes the identifier of the temporary group, and the group regrouping release message is used to request the first group management functional entity to release the temporary group according to the identifier of the temporary group; and send group regrouping release notification information to the second UE according to the group regrouping release message, where the group regrouping release notification information includes the identifier of the temporary group; and the group regrouping release notification information is used to instruct the second UE to delete the group regrouping information according to the identifier of the temporary group.

0053With reference to the eighth possible implementation of the seventh aspect, in a ninth possible implementation of the seventh aspect, when an MCPTT group to which the second MCPTT user belongs is not an MCPTT group managed by the first group management functional entity, when sending the group regrouping release notification information to the second UE according to the group regrouping release message, the transceiver is specifically configured to send, according to the group regrouping release message, the group regrouping release notification information to a group management functional entity of the MCPTT group to which the second MCPTT user belongs, so that the group management functional entity of the MCPTT group to which the second MCPTT user belongs sends the group regrouping release notification information to the second UE.

0054With reference to the eighth possible implementation of the seventh aspect or the ninth possible implementation of the seventh aspect, in a tenth possible implementation of the seventh aspect, the processor is further configured to: after the transceiver receives the group regrouping release message sent by the first UE, delete the information about the temporary group.

0055According to an eighth aspect, an embodiment of the present invention provides UE, used as first UE, including: <ul id="ul0013" list-style="none" compact="compact"><li>a processor, configured to generate a group regrouping creation message, where the group regrouping creation message includes identifiers of N MCPTT groups, and the group regrouping creation message is used to request a first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped, where N is an integer greater than or equal to 2; the first MCPTT user belongs to at least one MCPTT group of the N MCPTT groups; and the first group management functional entity is a group function management entity in a home network of the first MCPTT user; and</li><li>a transceiver, configured to send the group regrouping creation message to the first group management functional entity.</li></ul>

0056In a first possible implementation of the eighth aspect, the transceiver is further configured to: after sending the group regrouping creation message to the first group management functional entity, receive a group regrouping complete message sent by the first group management functional entity.

0057With reference to the eighth aspect or the first possible implementation of the eighth aspect, in a second possible implementation of the eighth aspect, the transceiver is further configured to: after sending the group regrouping creation message to the first group management functional entity, receive group regrouping information sent by the first group management functional entity, where the group regrouping information includes an identifier of the temporary group.

0058With reference to the eighth aspect or the first possible implementation of the eighth aspect or the second possible implementation of the eighth aspect, in a third possible implementation of the eighth aspect, the transceiver is further configured to: after sending the group regrouping creation message to the first group management functional entity, send a group regrouping release message to the first group management functional entity, where the group regrouping release message includes the identifier of the temporary group, and the group regrouping release message is used to request the first group management functional entity to release the temporary group according to the identifier of the temporary group; and receive group regrouping release notification information sent by the first group management functional entity, where the group regrouping release notification information includes the identifier of the temporary group; and

0059the processor is further configured to delete the group regrouping information according to the identifier of the temporary group in the group regrouping release notification information.

0060According to a ninth aspect, an embodiment of the present invention provides a group management functional entity, used as a second group management functional entity, including: <ul id="ul0014" list-style="none" compact="compact"><li>a receiver, configured to receive a group regrouping creation message that is sent by first UE and that is forwarded by a first group management functional entity, where the group regrouping creation message includes identifiers of N MCPTT groups, the group regrouping creation message is used to request the first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped, and the second group management functional entity manages at least one MCPTT group of the N MCPTT groups; the first group management functional entity is a group management functional entity in a home network of the first MCPTT user; and the first MCPTT user belongs to at least one MCPTT group of the N MCPTT groups; and</li><li>a transmitter, configured to send a group regrouping response message to the first group management functional entity.</li></ul>

0061In a first possible implementation of the ninth aspect, the group regrouping response message further includes information about an MCPTT user in the at least one MCPTT group that is of the N MCPTT groups and that is managed by the second group management functional entity.

0062With reference to the ninth aspect or the first possible implementation of the ninth aspect, in a second possible implementation of the ninth aspect, the receiver is further configured to: after the transmitter sends the group regrouping response message to the first group management functional entity, receive group regrouping information sent by the first group management functional entity, where the group regrouping information includes an identifier of the temporary group; and the transmitter is further configured to send the group regrouping information to second UE, where the second UE is UE used by a second MCPTT user, and the second MCPTT user is any MCPTT user in the at least one MCPTT group that is of the N MCPTT groups and that is managed by the second group management functional entity.

0063With reference to the second possible implementation of the ninth aspect, in a third possible implementation of the ninth aspect, the receiver is further configured to receive group regrouping release notification information sent by the first group management functional entity, where the group regrouping release notification information includes the identifier of the temporary group; and the group regrouping release notification information is used to instruct to delete the group regrouping information according to the identifier of the temporary group; and the transmitter is further configured to send the group regrouping release notification information to the second UE.

0064With reference to the third possible implementation of the ninth aspect, in a fourth possible implementation of the ninth aspect, the group management functional entity further includes: a processor, configured to: after the receiver receives the group regrouping release notification information sent by the first group management functional entity, delete the group regrouping information.

0065According to the method for regrouping multiple groups and the device that are provided in the embodiments of the present invention, a first group management functional entity receives a group regrouping creation message sent by first UE, where the group regrouping creation message includes identifiers of N MCPTT groups, and the group regrouping creation message is used to request the first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped; and then configures information about the temporary group, where the information about the temporary group includes an identifier of the temporary group into which the N MCPTT groups are regrouped, and the identifiers of the N MCPTT groups, so as to regroup the N MCPTT groups. Therefore, an MCPTT user in the N MCPTT groups belongs to the temporary group into which the N MCPTT groups are regrouped, so that UEs used by MCPTT users that belong to the same temporary group into which the N MCPTT groups are regrouped can communicate with each other.

BRIEF DESCRIPTION OF DRAWINGS

0066To describe the technical solutions in the embodiments of the present invention or in the prior art more clearly, the following briefly describes the accompanying drawings required for describing the embodiments or the prior art. Apparently, the accompanying drawings in the following description show some embodiments of the present invention, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts. <ul id="ul0015" list-style="none" compact="compact"><li><figref idref="f0001">FIG. 1</figref> is a flowchart of Embodiment 1 of a method for regrouping multiple groups according to the present invention;</li><li><figref idref="f0001">FIG. 2</figref> is a flowchart of Embodiment 2 of a method for regrouping multiple groups according to the present invention;</li><li><figref idref="f0002">FIG. 3</figref> is a flowchart of Embodiment 3 of a method for regrouping multiple groups according to the present invention;</li><li><figref idref="f0002">FIG. 4</figref> is a flowchart of Embodiment 4 of a method for regrouping multiple groups according to the present invention;</li><li><figref idref="f0003">FIG. 5</figref> is a flowchart of Embodiment 5 of a method for regrouping multiple groups according to the present invention;</li><li><figref idref="f0003">FIG. 6</figref> is a flowchart of Embodiment 6 of a method for regrouping multiple groups according to the present invention;</li><li><figref idref="f0004">FIG. 7</figref> is a flowchart of Embodiment 7 of a method for regrouping multiple groups according to the present invention;</li><li><figref idref="f0004">FIG. 8</figref> is a schematic structural diagram of Embodiment 1 of a group management functional entity according to the present invention;</li><li><figref idref="f0004">FIG. 9</figref> is a schematic structural diagram of Embodiment 1 of UE according to the present invention;</li><li><figref idref="f0005">FIG. 10</figref> is a schematic structural diagram of Embodiment 2 of a group management functional entity according to the present invention;</li><li><figref idref="f0005">FIG. 11</figref> is a schematic structural diagram of Embodiment 3 of a group management functional entity according to the present invention;</li><li><figref idref="f0005">FIG. 12</figref> is a schematic structural diagram of Embodiment 2 of UE according to the present invention; and</li><li><figref idref="f0005">FIG. 13</figref> is a schematic structural diagram of Embodiment 4 of a group management functional entity according to the present invention.</li></ul>

DESCRIPTION OF EMBODIMENTS

0067To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

0068<figref idref="f0001">FIG. 1</figref> is a flowchart of Embodiment 1 of a method for regrouping multiple groups according to the present invention. As shown in <figref idref="f0001">FIG. 1</figref>, the method in this embodiment may include the following steps.

0069S 101: A first group management functional entity receives a group regrouping creation message sent by first UE, where the group regrouping creation message includes identifiers of N MCPTT groups, and the group regrouping creation message is used to request the first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped.

0070In this embodiment, the first group management functional entity is a group management functional entity in a home network of the first MCPTT user. The first group management functional entity receives the group regrouping creation message sent by the first UE. The group regrouping creation message includes the identifiers of the N MCPTT groups, and the group regrouping creation message is used to request the first group management functional entity to create, according to the identifiers of the N MCPTT groups, the temporary group which is initiated by the first MCPTT user and into which the N MCPTT groups are regrouped. Each MCPTT group includes at least one MCPTT user. The first MCPTT user belongs to at least one MCPTT group of the N MCPTT groups, that is, the first MCPTT user may belong to multiple MCPTT groups of the N MCPTT groups at the same time.

0071S102: The first group management functional entity configures information about the temporary group, where the information about the temporary group includes: an identifier of the temporary group into which the N MCPTT groups are regrouped, and the identifiers of the N MCPTT groups.

0072In this embodiment, after receiving the group regrouping creation message sent by the first UE, the first group management functional entity may regroup the N MCPTT groups into a group, where the group obtained after the regrouping is referred to as a temporary group. The first group management functional entity may further configure the identifier of the temporary group, and then the information about the temporary group may be generated. In this embodiment, the first group management functional entity completes configuring the information about the temporary group, indicating that the temporary group into which the N MCPTTs are regrouped has been created.

0073According to the method for regrouping multiple groups that is provided in the embodiment, a first group management functional entity receives a group regrouping creation message sent by first UE, where the group regrouping creation message includes identifiers of N MCPTT groups, and the group regrouping creation message is used to request the first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped; and then configures information about the temporary group, where the information about the temporary group includes an identifier of the temporary group into which the N MCPTT groups are regrouped, and the identifiers of the N MCPTT groups, so as to regroup the N MCPTT groups. Therefore, an MCPTT user in the N MCPTT groups belongs to the temporary group into which the N MCPTT groups are regrouped, so that UEs used by MCPTT users that belong to the same temporary group into which the N MCPTT groups are regrouped can communicate with each other.

0074Optionally, after configuring the information about the temporary group, the first group management functional entity may further send a group regrouping complete message to the first UE. The group regrouping complete message is used to indicate that the regrouping of the N MCPTT groups is completed. Correspondingly, the first UE receives the group regrouping complete message sent by the first group management functional entity, and learns that the regrouping of the N MCPTT groups is completed.

0075Optionally, the information about the temporary group, configured by the first group management functional entity, further includes at least one of the following: information about an MCPTT user in at least one MCPTT group of the N MCPTT groups, a priority of the temporary group, or a security level of the temporary group.

0076<figref idref="f0001">FIG. 2</figref> is a flowchart of Embodiment 2 of a method for regrouping multiple groups according to the present invention. As shown in <figref idref="f0001">FIG. 2</figref>, the method in this embodiment may include the following steps.

0077S201: First UE generates a group regrouping creation message, where the group regrouping creation message includes identifiers of N MCPTT groups, and the group regrouping creation message is used to request a first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped.

0078In this embodiment, the first UE is UE used by the first MCPTT user. When the first MCPTT user initiates regrouping of the N MCPTT groups, the first UE may determine that the first MCPTT user initiates the regrouping of the N MCPTT groups. The first UE may generate the group regrouping creation message. The group regrouping creation message is used to request the first group management functional entity to create the temporary group which is initiated by the first MCPTT user and into which the N MCPTT groups are regrouped. The first group management functional entity is a group function management entity in a home network of the first MCPTT user. N is an integer greater than or equal to 2. Each MCPTT group includes at least one MCPTT user. The first MCPTT user may belong to at least one MCPTT group at the same time, and therefore, an MCPTT group to which the first MCPTT user belongs is at least one MCPTT group of the N MCPTT groups.

0079S202: The first UE sends the group regrouping creation message to the first group management functional entity.

0080In this embodiment, after generating the group regrouping creation message, the first UE sends the group regrouping creation message to the first group management functional entity, so that after receiving the group regrouping creation message, the first group management functional entity configures, according to the group regrouping creation message, information about the temporary group into which the N MCPTT groups are regrouped, where the information about the temporary group includes an identifier of the temporary group, and the identifiers of the N MCPTT groups, so as to regroup the N MCPTT groups.

0081According to the method for regrouping multiple groups that is provided in this embodiment, first UE generates a group regrouping creation message, where the group regrouping creation message includes identifiers of N MCPTT groups, and the group regrouping creation message is used to request a first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped; and then sends the group regrouping creation message to the first group management functional entity, where the first group management functional entity is a group function management entity in a home network of the first MCPTT user, so that the first group management functional entity configures information about the temporary group, so as to regroup the N MCPTT groups. Therefore, an MCPTT user in the N MCPTT groups belongs to the temporary group into which the N MCPTT groups are regrouped, so that UEs used by MCPTT users that belong to the same temporary group into which the N MCPTT groups are regrouped can communicate with each other.

0082Optionally, after the first UE sends the group regrouping creation message to the first group management functional entity, the first UE receives a group regrouping complete message sent by the first group management functional entity. The group regrouping complete message is used to indicate that the regrouping of the N MCPTT groups is completed. Therefore, the first UE may learn, according to the group regrouping complete message, that the regrouping of the N MCPTT groups is completed.

0083Optionally, after sending the group regrouping creation message to the first group management functional entity, the first UE may further receive group regrouping information sent by the first group management functional entity. The group regrouping information includes the identifier of the temporary group into which the N MCPTT groups are regrouped.

0084Optionally, the information about the temporary group, configured by the first group management functional entity, further includes at least one of the following: information about an MCPTT user in at least one MCPTT group of the N MCPTT groups, a priority of the temporary group, or a security level of the temporary group. Therefore, the group regrouping information may further include at least one of the following: information about an MCPTT user in at least one MCPTT group of the N MCPTT groups, a priority of the temporary group, or a security level of the temporary group.

0085Optionally, information about an MCPTT user in at least one MCPTT group of the N MCPTT groups that is in the group regrouping information may include information about an MCPTT user in the at least one MCPTT group that is of the N MCPTT groups and that is managed by the first group management functional entity, or may include information about an MCPTT user in at least one MCPTT group that is of the N MCPTT groups and that is not an MCPTT group managed by the first group management functional entity.

0086<figref idref="f0002">FIG. 3</figref> is a flowchart of Embodiment 3 of a method for regrouping multiple groups according to the present invention. As shown in <figref idref="f0002">FIG. 3</figref>, in this embodiment, at least one MCPTT group of N MCPTT groups is not an MCPTT group managed by a first group management functional entity, where the at least one MCPTT group of the N MCPTT groups is referred to as a first MCPTT group, that is, the first group management functional entity manages an MCPTT group that is of the N MCPTT groups and that is not the first MCPTT group. The method in this embodiment may include the following steps.

0087S301: First UE generates a group regrouping creation message.

0088The group regrouping creation message includes identifiers of N MCPTT groups, and the group regrouping creation message is used to request a first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped. N is an integer greater than or equal to 2. The first UE is UE used by the first MCPTT user. The first MCPTT user belongs to at least one MCPTT group of the N MCPTT groups.

0089S302: The first UE sends the group regrouping creation message to a first group management functional entity.

0090Each MCPTT group includes at least one MCPTT user. The first group management functional entity is a group management functional entity in a home network of the first MCPTT user.

0091In this embodiment, for a specific implementation process of S301 and S302, refer to the related description in Embodiment 2 of the method in the present invention. Details are not described herein again.

0092The first MCPTT group is not an MCPTT group managed by the first group function management entity, and there is at least one group management functional entity that manages each MCPTT group of the first MCPTT group. Herein, any group management functional entity that manages the at least one MCPTT group of the first MCPTT group is used as an example, to perform S303 and S304. The any group management functional entity is referred to a second group management functional entity. Operations corresponding to another group management functional entity are similar. Details are not described herein again.

0093S303: The first group management functional entity sends a group regrouping creation message to a second group management functional entity.

0094S304: The second group management functional entity sends a group regrouping response message to the first group management functional entity.

0095In this embodiment, after the second group management functional entity receives the group regrouping creation message sent by the first group management functional entity, the second group management functional entity sends the group regrouping response message to the first group management functional entity, so that the first group management functional entity can receive the group regrouping response message sent by the second group management functional entity. The group regrouping response message may be used to indicate that the regrouping of the N MCPTT groups is completed.

0096Optionally, before sending the group regrouping response message to the first group management functional entity, the second group management functional entity may further determine to agree to regroup the N MCPTT groups, and this may specifically be: the group management functional entity asks for permission of an owner or an administrator or an MCPTT user of at least one MCPTT group that is of the first MCPTT group and that is managed by the group management functional entity.

0097S305: The first group management functional entity configures information about a temporary group according to the received group regrouping response message.

0098In this embodiment, although the foregoing only describes that the second group management functional entity sends the group regrouping response message to the first group management functional entity, another group management functional entity also sends a group regrouping response message to the first group management functional entity. Therefore, the first group management functional entity may receive a group regrouping response message sent by at least one group management functional entity, and then the first group management functional entity may configure the information about the temporary group.

0099Optionally, before performing S305, the first group management functional entity may further determine to agree on regrouping of the N MCPTT groups. An optional implementation may be: the first group management functional entity asks for permission of an owner or an administrator or an MCPTT user of an MCPTT group that is of the N MCPTT groups and that is not the first MCPTT group, where the MCPTT group that is of the N MCPTT groups and that is not the first MCPTT group is an MCPTT group managed by the first group management functional entity.

0100Optionally, the information about the temporary group, configured by the first group management functional entity, further includes at least one of the following: a priority of the temporary group, and a security level of the temporary group.

0101Optionally, the information about the temporary group, configured by the first group management functional entity, further includes: information about an MCPTT user in an MCPTT group that is of the N MCPTT groups and that is not the first MCPTT group.

0102Optionally, the group regrouping response message further includes information about an MCPTT user in at least one MCPTT group that is of the first MCPTT group and that is managed by the second group management functional entity; correspondingly, when configuring the information about the temporary group, the first group management functional entity may also add the information included in the group regrouping response message to the information about the temporary group, so that the information about the temporary group further includes the information about the MCPTT user in the at least one MCPTT group that is of the first MCPTT group and that is managed by the second group management functional entity.

0103For example, when there are two group management functional entities that manage the first MCPTT group, if both the two group management functional entities disallow the first group management functional entity to share information about an MCPTT user in an MCPTT group managed by either of the two group management functional entities, group regrouping response messages sent by the two group management functional entities do not include the information about an MCPTT user in an MCPTT group managed by either of the two group management functional entities. If both the two group management functional entities allow the first group management functional entity to share information about an MCPTT user in an MCPTT group managed by either of the two group management functional entities, group regrouping response messages sent by the two group management functional entities include the information about an MCPTT user in an MCPTT group managed by either of the two group management functional entities. If one of the two group management functional entities allows the first group management functional entity to share information about an MCPTT user in an MCPTT group managed by the one group management functional entity, while the other group management functional entity disallows the first group management functional entity to share information about an MCPTT user in an MCPTT group managed by the other group management functional entity, a group regrouping response message sent by the one group management functional entity includes the information about an MCPTT user in an MCPTT group managed by the one group management functional entity, while a group regrouping response message sent by the other group management functional entity does not include the information about an MCPTT user in an MCPTT group managed by the other group management functional entity.

0104In this embodiment, after configuring the information about the temporary group, the first group management functional entity may send group regrouping information to UE used by any MCPTT user in the N MCPTT groups. Herein, the any MCPTT user is referred to as a second MCPTT user, and UE used by the second MCPTT user is referred to as second UE. The second MCPTT user is used as an example for description, and the procedure for another MCPTT user is similar. Details are not described herein again.

0105S306: The first group management functional entity sends group regrouping information to second UE.

0106In this embodiment, after configuring the information about the temporary group, the first group management functional entity determines, according to the information about the temporary group, group regrouping information to be sent, and then sends the group regrouping information to the second UE. The group regrouping information includes an identifier of the temporary group.

0107Optionally, the group management information further includes the identifiers of the N MCPTT groups.

0108Optionally, the group regrouping information further includes information about an MCPTT user in the at least one MCPTT group of the N MCPTT groups, that is, the group regrouping information further includes the information about an MCPTT user in the at least one MCPTT group, in the information about the temporary group.

0109Optionally, the group regrouping information further includes a priority of the temporary group.

0110Optionally, the group regrouping information further includes a security level of the temporary group.

0111Optionally, the group regrouping information is the information about the temporary group.

0112In an optional implementation, if the first group management functional entity may obtain information about the second MCPTT user, the first group management functional entity sends the group regrouping information to the second UE according to the information about the second MCPTT user and the information about the temporary group. For example, when the first group management functional entity manages an MCPTT group to which the second MCPTT user in the N MCPTT groups belongs, the first group management functional entity may obtain the information about the second MCPTT user; or, when the first group management functional entity does not manage an MCPTT group to which the second MCPTT user in the N MCPTT groups belongs, the first group management functional entity may obtain the information about the second MCPTT user from the group management functional entity that manages the MCPTT group to which the second MCPTT user belongs.

0113In a second optional implementation, when an MCPTT group to which the second MCPTT user in the N MCPTT groups belongs is not an MCPTT group managed by the first group management functional entity, the first group management functional entity may send the group regrouping information to the second UE by using a group management functional entity of the MCPTT group to which the second MCPTT user belongs. Specifically, the first group management functional entity sends the group regrouping information to the group management functional entity of the MCPTT group to which the second MCPTT user belongs, where the group regrouping information includes the identifier of the temporary group. After receiving the group regrouping information, the group management functional entity of the MCPTT group to which the second MCPTT user belongs may send the group regrouping information to the second UE used by the second MCPTT user. The group management functional entity of the MCPTT group to which the second MCPTT user belongs may manage at least one MCPTT group of the N MCPTT groups, where the at least one MCPTT group may include at least one MCPTT user. Therefore, the group management functional entity of the MCPTT group to which the second MCPTT user belongs may further send the group regrouping information to UE used by an MCPTT user other than the second MCPTT user. Optionally, after receiving the group regrouping information, the group management functional entity of the MCPTT group to which the second MCPTT user belongs may store the group regrouping information.

0114S307: The first group management functional entity sends a group regrouping complete message to the first UE.

0115In this embodiment, for a specific implementation process of S307, refer to the related description in the foregoing method embodiments in the present invention. Details are not described herein again.

0116According to the method for regrouping multiple groups that is provided in this embodiment, first UE sends a group regrouping creation message to a first group management functional entity. The first group management functional entity sends the group regrouping creation message to group management functional entities of other MCPTT groups of the N MCPTT groups, and then receives group regrouping response messages sent by these group management functional entities. The first group management functional entity configures information about a temporary group according to the received group regrouping response messages, and sends, according to the information about the temporary group, group regrouping information to UE used by any MCPTT user in the N MCPTT groups, so as to regroup the N MCPTT groups. Therefore, an MCPTT user in the N MCPTT groups belongs to the temporary group into which the N MCPTT groups are regrouped, so that UEs used by MCPTT users that belong to the same temporary group into which the N MCPTT groups are regrouped can communicate with each other.

0117<figref idref="f0002">FIG. 4</figref> is a flowchart of Embodiment 4 of a method for regrouping multiple groups according to the present invention. As shown in <figref idref="f0002">FIG. 4</figref>, in this embodiment, N MCPTT groups are MCPTT groups managed by a first group management functional entity, that is, the first group management functional entity manages the N MCPTT groups. The method in this embodiment may include the following steps.

0118S401: First UE generates a group regrouping creation message.

0119The group regrouping creation message includes identifiers of N MCPTT groups, and the group regrouping creation message is used to request a first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped. N is an integer greater than or equal to 2. The first UE is UE used by the first MCPTT user. The first group management functional entity is a group management functional entity in a home network of the first MCPTT user.

0120S402: The first UE sends the group regrouping creation message to a first group management functional entity.

0121Each MCPTT group includes at least one MCPTT user.

0122In this embodiment, for a specific implementation process of S401 and S402, refer to the related description in Embodiment 3 of the method in the present invention. Details are not described herein again.

0123S403: The first group management functional entity configures information about a temporary group.

0124In this embodiment, the first group management functional entity is a group management functional entity that manages the N MCPTT groups. Therefore, the first group management functional entity may obtain information about an MCPTT user in the N MCPTT groups, and may configure an identifier of the temporary group into which the N MCPTT groups are regrouped, and then generate the information about the temporary group. The information about the temporary group includes: the identifier of the temporary group into which the N MCPTT groups are regrouped, the identifiers of the N MCPTT groups, and the information about the MCPTT user in the N MCPTT groups.

0125Optionally, the information about the temporary group further includes at least one of the following: a priority of the temporary group, and a security level of the temporary group.

0126S404: The first group management functional entity sends group regrouping information to second UE.

0127In this embodiment, the first group management functional entity may determine, according to the information about the temporary group, the group regrouping information that needs to be sent. A second MCPTT user is any MCPTT user in the N MCPTT groups, and UE used by the second MCPTT user is referred to as the second UE. The first group management functional entity manages the N MCPTT groups, and therefore, the first group management functional entity may obtain information about the second MCPTT user, and then send, according to the information about the second MCPTT user, the group regrouping information to the second UE. The first group management functional entity may further send the group regrouping information to UE used by an MCPTT user that is in the first MCPTT group and that is not the second MCPTT user. It should be noted that, the second MCPTT user may also be the first MCPTT user, and the second UE may also be the first UE.

0128Optionally, the group management information further includes the identifiers of the N MCPTT groups.

0129Optionally, the group regrouping information further includes information about an MCPTT user in the at least one MCPTT group of the N MCPTT groups, that is, the group regrouping information further includes the information about an MCPTT user in the at least one MCPTT group, in the information about the temporary group.

0130Optionally, the group regrouping information further includes a priority of the temporary group.

0131Optionally, the group regrouping information further includes a security level of the temporary group.

0132Optionally, the group regrouping information is the information about the temporary group.

0133S405: The first group management functional entity sends a group regrouping complete message to the first UE.

0134In this embodiment, for a specific implementation process of S405, refer to the related description in the foregoing method embodiments in the present invention. Details are not described herein again.

0135According to the method for regrouping multiple groups that is provided in this embodiment, first UE sends a group regrouping creation message to a first group management functional entity. The first group management functional entity configures information about a temporary group, and then sends, according to the information about the temporary group, group regrouping information to UE used by any MCPTT user in N MCPTT groups, so as to regroup the N MCPTT groups. Therefore, an MCPTT user in the N MCPTT groups belongs to the temporary group into which the N MCPTT groups are regrouped, so that UEs used by MCPTT users that belong to the same temporary group into which the N MCPTT groups are regrouped can communicate with each other.

0136<figref idref="f0003">FIG. 5</figref> is a flowchart of Embodiment 5 of a method for regrouping multiple groups according to the present invention. As shown in <figref idref="f0003">FIG. 5</figref>, based on the embodiment shown in <figref idref="f0002">FIG. 3</figref>, the method in this embodiment may further include the following steps.

0137S501: The first UE sends a group regrouping release message to the first group management functional entity.

0138In this embodiment, when the first UE determines that the first MCPTT user using the first UE initiates release of the temporary group into which the N MCPTT groups are regrouped, the first UE may send the group regrouping release message to the first group management functional entity. The group regrouping release message includes the identifier of the temporary group; and the group regrouping release message is used to request the first group management functional entity to release, according to the identifier of the temporary group, the temporary group into which the N MCPTT groups are regrouped.

0139S502: The first group management functional entity sends group regrouping release notification information to the second UE according to the group regrouping release message.

0140In this embodiment, after receiving the group regrouping release message sent by the first UE, the first group management functional entity sends the group regrouping release notification information to the second UE. The group regrouping release notification information includes the identifier of the temporary group, and the group regrouping release notification information is used to instruct the second UE to delete, according to the identifier of the temporary group, the received group regrouping information.

0141In an optional implementation, if the first group management functional entity may obtain information about the second MCPTT user, the first group management functional entity sends the group regrouping release notification information to the second UE according to the information about the second MCPTT user and the group regrouping release message. For example, when the first group management functional entity manages an MCPTT group to which the second MCPTT user in the N MCPTT groups belongs, the first group management functional entity may obtain the information about the second MCPTT user; or, when the first group management functional entity does not manage an MCPTT group to which the second MCPTT user in the N MCPTT groups belongs, the first group management functional entity may obtain the information about the second MCPTT user from the group management functional entity that manages the MCPTT group to which the second MCPTT user belongs.

0142In a second optional implementation, when an MCPTT group to which the second MCPTT user in the N MCPTT groups belongs is not an MCPTT group managed by the first group management functional entity, the first group management functional entity may send the group regrouping release notification information to the second UE by using a group management functional entity of the MCPTT group to which the second MCPTT user belongs. Specifically, the first group management functional entity sends the group regrouping release notification information to the group management functional entity of the MCPTT group to which the second MCPTT user belongs, where the group regrouping release notification information includes the identifier of the temporary group. After receiving the group regrouping release notification information, the group management functional entity of the MCPTT group to which the second MCPTT user belongs may send the group regrouping release notification information to the second UE used by the second MCPTT user. The group management functional entity of the MCPTT group to which the second MCPTT user belongs may manage at least one MCPTT group of the N MCPTT groups, where the at least one MCPTT group may include at least one MCPTT user. Therefore, the group management functional entity of the MCPTT group to which the second MCPTT user belongs may further send the group regrouping release notification information to UE used by an MCPTT user other than the second MCPTT user.

0143S503: The second UE deletes the group regrouping information according to the group regrouping release notification information.

0144After receiving the group regrouping release notification information sent by the group management functional entity of the MCPTT group to which the second MCPTT user belongs, the second UE deletes the group regrouping information according to the received group regrouping release notification information. As a result, the temporary group into which the N MCPTT groups are regrouped is released.

0145Optionally, the second UE may further send group regrouping release response information to the group management functional entity of the MCPTT group to which the second MCPTT user belongs, where the group regrouping release response information is used to indicate that the group regrouping information has been deleted. Alternatively, the group management functional entity of the MCPTT group to which the second MCPTT user belongs may send the group regrouping release response information to the first group management functional entity.

0146Optionally, after receiving the group regrouping release notification information, the group management functional entity of the MCPTT group to which the second MCPTT user belongs deletes, according to the group regrouping release notification information, the group regrouping information stored by the group management functional entity.

0147Optionally, the first group management functional entity may further send a group regrouping release complete message to the first UE. The group regrouping release complete message is used to indicate that the temporary group into which the N MCPTT groups are regrouped has been released.

0148Optionally, after receiving the group regrouping release message sent by the first UE, the first group management functional entity may delete, according to the group regrouping release message, the information about the temporary group stored by the first group management functional entity.

0149According to the method for regrouping multiple groups that is provided in this embodiment, first UE sends a group regrouping release message to a first group management functional entity. The first group management functional entity instructs, according to the group regrouping release message, UE of an MCPTT user in N MCPTT groups to delete group regrouping information, so as to release a temporary group into which the N MCPTT groups are regrouped.

0150<figref idref="f0003">FIG. 6</figref> is a flowchart of Embodiment 6 of a method for regrouping multiple groups according to the present invention. As shown in <figref idref="f0003">FIG. 6</figref>, based on the embodiment shown in <figref idref="f0002">FIG. 4</figref>, the method in this embodiment may further include the following steps.

0151S601: The first UE sends a group regrouping release message to the first group management functional entity.

0152In this embodiment, for a specific implementation process of S601, refer to the related description in Embodiment 5 of the method in the present invention. Details are not described herein again.

0153S602: The first group management functional entity sends group regrouping release notification information to the second UE.

0154In this embodiment, the second MCPTT user is any MCPTT user of the N MCPTT groups. For the second MCPTT user, refer to the related description in Embodiment 4 of the method in the present invention. Details are not described herein again. The first MCPTT group may obtain the information about the MCPTT user in the N MCPTT groups, and therefore, the first group management functional entity may send the group regrouping release notification information to the second UE according to the information about the second MCPTT user. The group regrouping release notification information includes the identifier of the temporary group. The group regrouping release notification information is used to instruct the second UE to delete the group regrouping information according to the identifier of the temporary group. The first group management functional entity may further send the group regrouping release notification information to UE used by an MCPTT user in the first MCPTT group other than the second MCPTT user.

0155S603: The second UE deletes the group regrouping information according to the group regrouping release notification information.

0156In this embodiment, after receiving the group regrouping release notification information sent by the first group management functional entity, the second UE deletes the group regrouping information according to the received group regrouping release notification information. Optionally, the second UE may further send group regrouping release response information to the first group management functional entity. The group regrouping release response information is used to indicate that the group regrouping information has been deleted.

0157Optionally, the first group management functional entity may further send a group regrouping release complete message to the first UE. The group regrouping release complete message is used to indicate that the temporary group into which the N MCPTT groups are regrouped has been released.

0158Optionally, after receiving the group regrouping release message sent by the first UE, the first group management functional entity may delete, according to the group regrouping release message, the information about the temporary group stored by the first group management functional entity.

0159According to the method for regrouping multiple groups that is provided in this embodiment, first UE sends a group regrouping release message to a first group management functional entity. The first group management functional entity instructs, according to the group regrouping release message, UE used by an MCPTT user in N MCPTT groups to delete group regrouping information, so as to release a temporary group into which the N MCPTT groups are regrouped.

0160<figref idref="f0004">FIG. 7</figref> is a flowchart of Embodiment 7 of a method for regrouping multiple groups according to the present invention. As shown in <figref idref="f0004">FIG. 7</figref>, the method in this embodiment may include the following steps.

0161S701: A second group management functional entity receives a group regrouping creation message that is sent by first UE and that is forwarded by a first group management functional entity, where the group regrouping creation message includes identifiers of N MCPTT groups, and the group regrouping creation message is used to request the first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped.

0162N is an integer greater than or equal to 2. Each MCPTT group includes at least one MCPTT user. The first group management functional entity is a group management functional entity in a home network of the first MCPTT user. The second group management functional entity manages at least one MCPTT group of the N MCPTT groups. The first MCPTT user belongs to at least one MCPTT group of the N MCPTT groups.

0163S702: The second group management functional entity sends a group regrouping response message to the first group management functional entity.

0164Optionally, the group regrouping response message further includes information about an MCPTT user in the at least one MCPTT group that is of the N MCPTT groups and that is managed by the second group management functional entity.

0165In this embodiment, for a specific implementation process of S701 and S702, refer to the description related to the second group management functional entity in Embodiment 3 of the method in the present invention. Details are not described herein again.

0166According to the method for regrouping multiple groups that is provided in this embodiment, the regrouping of the N MCPTT groups is completed. Therefore, a user in the N MCPTT groups belongs to the temporary group into which the N MCPTT groups are regrouped, so that UEs used by MCPTT users that belong to the same temporary group into which the N MCPTT groups are regrouped can communicate with each other.

0167Optionally, the second group management functional entity further receives group regrouping information sent by the first group management functional entity. The group regrouping information includes an identifier of the temporary group into which the N MCPTT groups are regrouped. Then, the second group management functional entity sends the group regrouping information to second UE, where the second UE is UE used by a second MCPTT user, and the second MCPTT user is any MCPTT user in the at least one MCPTT group that is of the N MCPTT groups and that is managed by the second group management functional entity. For a specific implementation process, refer to the description related to the group management functional entity of the MCPTT group to which the second MCPTT user belongs in Embodiment 3 of the method in the present invention. Details are not described herein again.

0168Optionally, after S702 is performed, the method further includes: receiving, by the second group management functional entity, group regrouping release notification information sent by the first group management functional entity, where the group regrouping release notification information includes the identifier of the temporary group; and sending the group regrouping release notification information to the second UE. Optionally, after receiving the group regrouping release notification information sent by the first group management functional entity, the second group management functional entity may delete, according to the group regrouping release notification information, the group regrouping information stored by the second group management functional entity. For a specific implementation process, refer to the related description in the Embodiment 5 of the method in the present invention. Details are not described herein again. In this way, the temporary group into which the N MCPTT groups are regrouped is released.

0169It should be noted that, the group management functional entity of the MCPTT group to which the second MCPTT user belongs indicates that the group management functional entity manages the MCPTT group to which the second MCPTT user belongs.

0170<figref idref="f0004">FIG. 8</figref> is a schematic structural diagram of Embodiment 1 of a group management functional entity according to the present invention. As shown in <figref idref="f0004">FIG. 8</figref>, the group management functional entity in this embodiment is used as a first group management functional entity, and may include: a transceiver unit 11 and a processing unit 12. The transceiver unit 11 is configured to receive a group regrouping creation message sent by first UE, where the group regrouping creation message includes identifiers of N MCPTT groups, and the group regrouping creation message is used to request the first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped; the first group management functional entity is a group management functional entity in a home network of the first MCPTT user; and the first MCPTT user belongs to at least one MCPTT group of the N MCPTT groups. The processing unit 12 is configured to configure information about the temporary group, where the information about the temporary group includes: an identifier of the temporary group into which the N MCPTT groups are regrouped, and the identifiers of the N MCPTT groups.

0171Optionally, the transceiver unit 11 is further configured to: after the processing unit 12 configures the information about the temporary group, send a group regrouping complete message to the first UE.

0172Optionally, the information about the temporary group further includes at least one of the following: information about an MCPTT user in at least one MCPTT group of the N MCPTT groups, a priority of the temporary group, or a security level of the temporary group.

0173In an optional implementation, the N MCPTT groups are MCPTT groups managed by the first group management functional entity.

0174In another optional implementation, a first MCPTT group of the N MCPTT groups is not an MCPTT group managed by the first group management functional entity, and the first MCPTT group is at least one MCPTT group of the N MCPTT groups; the transceiver unit 11 is further configured to: before the processing unit 12 configures the information about the temporary group, send the group regrouping creation message to a second group management functional entity, where the second group management functional entity is any group management functional entity that manages at least one MCPTT group of the first MCPTT group; and receive a group regrouping response message sent by the second group management functional entity; and when configuring the information about the temporary group, the processing unit 12 is specifically configured to configure the information about the temporary group according to the group regrouping response message.

0175Optionally, the group regrouping response message further includes information about an MCPTT user in the at least one MCPTT group that is of the first MCPTT group and that is managed by the second group management functional entity.

0176Optionally, the transceiver unit 11 is further configured to: after the processing unit 12 configures the information about the temporary group, send group regrouping information to second UE, where the group regrouping information includes the identifier of the temporary group, the second UE is UE used by a second MCPTT user, and the second MCPTT user is any MCPTT user in the N MCPTT groups.

0177Optionally, when an MCPTT group to which the second MCPTT user belongs is not an MCPTT group managed by the first group management functional entity, when sending the group regrouping information to the second UE, the transceiver unit 11 is specifically configured to: send the group regrouping information to a group management functional entity of the MCPTT group to which the second MCPTT user belongs, so that the group management functional entity of the MCPTT group to which the second MCPTT user belongs sends the group regrouping information to the second UE.

0178Optionally, the transceiver unit 11 is further configured to receive a group regrouping release message sent by the first UE, where the group regrouping release message includes the identifier of the temporary group, and the group regrouping release message is used to request the first group management functional entity to release the temporary group according to the identifier of the temporary group; and send group regrouping release notification information to the second UE according to the group regrouping release message, where the group regrouping release notification information includes the identifier of the temporary group; and the group regrouping release notification information is used to instruct the second UE to delete the group regrouping information according to the identifier of the temporary group.

0179Optionally, when an MCPTT group to which the second MCPTT user belongs is not an MCPTT group managed by the first group management functional entity, when sending the group regrouping release notification information to the second UE according to the group regrouping release message, the transceiver unit 11 is specifically configured to send, according to the group regrouping release message, the group regrouping release notification information to a group management functional entity of the MCPTT group to which the second MCPTT user belongs, so that the group management functional entity of the MCPTT group to which the second MCPTT user belongs sends the group regrouping release notification information to the second UE.

0180Optionally, the processing unit 12 is further configured to: after the transceiver unit 11 receives the group regrouping release message sent by the first UE, delete the information about the temporary group.

0181The group management functional entity in this embodiment may be configured to execute the technical solutions executed by the first group management functional entity in the foregoing method embodiments of the present invention. The implementation principle and technical effects thereof are similar to those of the method embodiments. Details are not described herein again.

0182<figref idref="f0004">FIG. 9</figref> is a schematic structural diagram of Embodiment 1 of UE according to the present invention. As shown in <figref idref="f0004">FIG. 9</figref>, the UE in this embodiment is used as first UE, and may include: a processing unit 21 and a transceiver unit 22. The processing unit 21 is configured to generate a group regrouping creation message, where the group regrouping creation message includes identifiers of N MCPTT groups, and the group regrouping creation message is used to request a first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped, where N is an integer greater than or equal to 2; the first MCPTT user belongs to at least one MCPTT group of the N MCPTT groups; and the first group management functional entity is a group function management entity in a home network of the first MCPTT user. The transceiver unit 22 is configured to send the group regrouping creation message to the first group management functional entity.

0183Optionally, the transceiver unit 22 is further configured to: after sending the group regrouping creation message to the first group management functional entity, receive a group regrouping complete message sent by the first group management functional entity.

0184Optionally, the transceiver unit 22 is further configured to: after sending the group regrouping creation message to the first group management functional entity, receive group regrouping information sent by the first group management functional entity, where the group regrouping information includes an identifier of the temporary group.

0185Optionally, the transceiver unit 22 is further configured to: after sending the group regrouping creation message to the first group management functional entity, send a group regrouping release message to the first group management functional entity, where the group regrouping release message includes the identifier of the temporary group, and the group regrouping release message is used to request the first group management functional entity to release the temporary group according to the identifier of the temporary group; and receive group regrouping release notification information sent by the first group management functional entity, where the group regrouping release notification information includes the identifier of the temporary group; and the processing unit 21 is further configured to delete the group regrouping information according to the identifier of the temporary group in the group regrouping release notification information.

0186The UE in this embodiment may be configured to execute the technical solutions executed by the first UE in the foregoing method embodiments of the present invention. The implementation principle and technical effects thereof are similar to those of the method embodiments. Details are not described herein again.

0187<figref idref="f0005">FIG. 10</figref> is a schematic structural diagram of Embodiment 2 of a group management functional entity according to the present invention. As shown in <figref idref="f0005">FIG. 10</figref>, the group management functional entity in this embodiment is used as a second group management functional entity, and may include: a receiving unit 31 and a sending unit 32. The receiving unit 31 is configured to receive a group regrouping creation message that is sent by first user equipment UE and that is forwarded by a first group management functional entity, where the group regrouping creation message includes identifiers of N MCPTT groups, the group regrouping creation message is used to request the first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped, and the second group management functional entity manages at least one MCPTT group of the N MCPTT groups; the first group management functional entity is a group management functional entity in a home network of the first MCPTT user; and the first MCPTT user belongs to at least one MCPTT group of the N MCPTT groups. The sending unit 32 is configured to send a group regrouping response message to the first group management functional entity.

0188Optionally, the group regrouping response message further includes information about an MCPTT user in the at least one MCPTT group that is of the N MCPTT groups and that is managed by the second group management functional entity.

0189Optionally, the receiving unit 31 is further configured to: after the sending unit 32 sends the group regrouping response message to the first group management functional entity, receive group regrouping information sent by the first group management functional entity, where the group regrouping information includes an identifier of the temporary group; and the sending unit 32 is further configured to send the group regrouping information to second UE, where the second UE is UE used by a second MCPTT user, and the second MCPTT user is any MCPTT user in the at least one MCPTT group that is of the N MCPTT groups and that is managed by the second group management functional entity.

0190Optionally, the receiving unit 31 is further configured to receive group regrouping release notification information sent by the first group management functional entity, where the group regrouping release notification information includes the identifier of the temporary group; and the group regrouping release notification information is used to instruct to delete the group regrouping information according to the identifier of the temporary group; and the sending unit 32 is further configured to send the group regrouping release notification information to the second UE.

0191Optionally, the group management functional entity in this embodiment may further include: a processing unit 33. The processing unit 33 is configured to: after the receiving unit 31 receives the group regrouping release notification information sent by the first group management functional entity, delete the group regrouping information.

0192The group management functional entity in this embodiment may be configured to execute the technical solutions executed by the second group management functional entity in the foregoing method embodiments of the present invention. The implementation principle and technical effects thereof are similar to those of the method embodiments. Details are not described herein again.

0193<figref idref="f0005">FIG. 11</figref> is a schematic structural diagram of Embodiment 3 of a group management functional entity according to the present invention. As shown in <figref idref="f0005">FIG. 11</figref>, the group management functional entity in this embodiment is used as a first group management functional entity, and may include: a transceiver 41 and a processor 42. The transceiver 41 is configured to receive a group regrouping creation message sent by first UE, where the group regrouping creation message includes identifiers of N MCPTT groups, and the group regrouping creation message is used to request the first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped; the first group management functional entity is a group management functional entity in a home network of the first MCPTT user; and the first MCPTT user belongs to at least one MCPTT group of the N MCPTT groups. The processor 42 is configured to configure information about the temporary group, where the information about the temporary group includes: an identifier of the temporary group into which the N MCPTT groups are regrouped, and the identifiers of the N MCPTT groups.

0194Optionally, the transceiver 41 is further configured to: after the processor 42 configures the information about the temporary group, send a group regrouping complete message to the first UE.

0195Optionally, the information about the temporary group further includes at least one of the following: information about an MCPTT user in at least one MCPTT group of the N MCPTT groups, a priority of the temporary group, or a security level of the temporary group.

0196Optionally, the N MCPTT groups are MCPTT groups managed by the first group management functional entity.

0197Optionally, a first MCPTT group of the N MCPTT groups is not an MCPTT group managed by the first group management functional entity, and the first MCPTT group is at least one MCPTT group of the N MCPTT groups; the transceiver 41 is further configured to: before the processor 42 configures the information about the temporary group, send the group regrouping creation message to a second group management functional entity, where the second group management functional entity is any group management functional entity that manages at least one MCPTT group of the first MCPTT group; and receive a group regrouping response message sent by the second group management functional entity; and when configuring the information about the temporary group, the processor 42 is specifically configured to configure the information about the temporary group according to the group regrouping response message.

0198Optionally, the group regrouping response message further includes information about an MCPTT user in the at least one MCPTT group that is of the first MCPTT group and that is managed by the second group management functional entity.

0199Optionally, the transceiver 41 is further configured to: after the processor 42 configures the information about the temporary group, send group regrouping information to second UE, where the group regrouping information includes the identifier of the temporary group, the second UE is UE used by a second MCPTT user, and the second MCPTT user is any MCPTT user in the N MCPTT groups.

0200Optionally, when an MCPTT group to which the second MCPTT user belongs is not an MCPTT group managed by the first group management functional entity, when sending the group regrouping information to the second UE, the transceiver 41 is specifically configured to: send the group regrouping information to a group management functional entity of the MCPTT group to which the second MCPTT user belongs, so that the group management functional entity of the MCPTT group to which the second MCPTT user belongs sends the group regrouping information to the second UE.

0201Optionally, the transceiver 41 is further configured to: receive a group regrouping release message sent by the first UE, where the group regrouping release message includes the identifier of the temporary group, and the group regrouping release message is used to request the first group management functional entity to release the temporary group according to the identifier of the temporary group; and send group regrouping release notification information to the second UE according to the group regrouping release message, where the group regrouping release notification information includes the identifier of the temporary group; and the group regrouping release notification information is used to instruct the second UE to delete the group regrouping information according to the identifier of the temporary group.

0202Optionally, when an MCPTT group to which the second MCPTT user belongs is not an MCPTT group managed by the first group management functional entity, when sending the group regrouping release notification information to the second UE according to the group regrouping release message, the transceiver 41 is specifically configured to send, according to the group regrouping release message, the group regrouping release notification information to a group management functional entity of the MCPTT group to which the second MCPTT user belongs, so that the group management functional entity of the MCPTT group to which the second MCPTT user belongs sends the group regrouping release notification information to the second UE.

0203Optionally, the processor 42 is further configured to: after the transceiver 41 receives the group regrouping release message sent by the first UE, delete the information about the temporary group.

0204The group management functional entity in this embodiment may be configured to execute the technical solutions executed by the first group management functional entity in the foregoing method embodiments of the present invention. The implementation principle and technical effects thereof are similar to those of the method embodiments. Details are not described herein again.

0205<figref idref="f0005">FIG. 12</figref> is a schematic structural diagram of Embodiment 2 of UE according to the present invention. As shown in <figref idref="f0005">FIG. 12</figref>, the UE in this embodiment is used as first UE, and may include: a processor 51 and a transceiver 52. The processor 51 is configured to generate a group regrouping creation message, where the group regrouping creation message includes identifiers of N MCPTT groups, and the group regrouping creation message is used to request a first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped, where N is an integer greater than or equal to 2; the first MCPTT user belongs to at least one MCPTT group of the N MCPTT groups; and the first group management functional entity is a group function management entity in a home network of the first MCPTT user. The transceiver 52 is configured to send the group regrouping creation message to the first group management functional entity.

0206Optionally, the transceiver 52 is further configured to: after sending the group regrouping creation message to the first group management functional entity, receive a group regrouping complete message sent by the first group management functional entity.

0207Optionally, the transceiver 52 is further configured to: after sending the group regrouping creation message to the first group management functional entity, receive group regrouping information sent by the first group management functional entity, where the group regrouping information includes an identifier of the temporary group.

0208Optionally, the transceiver 52 is further configured to: after sending the group regrouping creation message to the first group management functional entity, send a group regrouping release message to the first group management functional entity, where the group regrouping release message includes the identifier of the temporary group, and the group regrouping release message is used to request the first group management functional entity to release the temporary group according to the identifier of the temporary group; and receive group regrouping release notification information sent by the first group management functional entity, where the group regrouping release notification information includes the identifier of the temporary group; and the processor 51 is further configured to delete the group regrouping information according to the identifier of the temporary group in the group regrouping release notification information.

0209The UE in this embodiment may be configured to execute the technical solutions executed by the first UE in the foregoing method embodiments of the present invention. The implementation principle and technical effects thereof are similar to those of the method embodiments. Details are not described herein again.

0210<figref idref="f0005">FIG. 13</figref> is a schematic structural diagram of Embodiment 4 of a group management functional entity according to the present invention. As shown in <figref idref="f0005">FIG. 13</figref>, the group management functional entity in this embodiment is used as a second group management functional entity, and may include: a receiver 61 and a transmitter 62. The receiver 61 is configured to receive a group regrouping creation message that is sent by first user equipment UE and that is forwarded by a first group management functional entity, where the group regrouping creation message includes identifiers of N MCPTT groups, the group regrouping creation message is used to request the first group management functional entity to create, according to the identifiers of the N MCPTT groups, a temporary group which is initiated by a first MCPTT user and into which the N MCPTT groups are regrouped, and the second group management functional entity manages at least one MCPTT group of the N MCPTT groups; the first group management functional entity is a group management functional entity in a home network of the first MCPTT user; and the first MCPTT user belongs to at least one MCPTT group of the N MCPTT groups. The transmitter 62 is configured to send a group regrouping response message to the first group management functional entity.

0211Optionally, the group regrouping response message further includes information about an MCPTT user in the at least one MCPTT group that is of the N MCPTT groups and that is managed by the second group management functional entity.

0212Optionally, the receiver 61 is further configured to: after the transmitter 62 sends the group regrouping response message to the first group management functional entity, receive group regrouping information sent by the first group management functional entity, where the group regrouping information includes an identifier of the temporary group; and the transmitter 62 is further configured to send the group regrouping information to second UE, where the second UE is UE used by a second MCPTT user, and the second MCPTT user is any MCPTT user in the at least one MCPTT group that is of the N MCPTT groups and that is managed by the second group management functional entity.

0213Optionally, the receiver 61 is further configured to receive group regrouping release notification information sent by the first group management functional entity, where the group regrouping release notification information includes the identifier of the temporary group; and the group regrouping release notification information is used to instruct to delete the group regrouping information according to the identifier of the temporary group; and the transmitter 62 is further configured to send the group regrouping release notification information to the second UE.

0214Optionally, the group management functional entity in this embodiment may further include: a processor 63. The processor 63 is configured to: after the receiver 61 receives the group regrouping release notification information sent by the first group management functional entity, delete the group regrouping information.

0215The group management functional entity in this embodiment may be configured to execute the technical solutions executed by the second group management functional entity in the foregoing method embodiments of the present invention. The implementation principle and technical effects thereof are similar to those of the method embodiments. Details are not described herein again.

0216A person of ordinary skill in the art may understand that all or a part of the steps of the method embodiments may be implemented by a program instructing relevant hardware. The program may be stored in a computer readable storage medium. When the program runs, the steps of the method embodiments are performed. The foregoing storage medium includes: any medium that can store program code, such as a read-only memory (English: Read-Only Memory, ROM for short), a random access memory (English: Random Access Memory, RAM for short), a magnetic disk, or an optical disc.

0217Finally, it should be noted that the foregoing embodiments are merely intended for describing the technical solutions of the present invention, but not for limiting the present invention. Although the present invention is described in detail with reference to the foregoing embodiments, a person of ordinary skill in the art should understand that they may still make modifications to the technical solutions described in the foregoing embodiments or make equivalent replacements to some or all technical features thereof, without departing from the scope of the technical solutions of the embodiments of the present invention.