# US 2019/0380010 A1 · Multi-Group Call Setup Method and Device

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- Number: US 2019/0380010 A1
- Document ID: US20190380010A1
- Status: Published application
- Kind: A1
- Application number: 16/550,643
- Filed: 2019-08-26
- Published: 2019-12-12
- Earliest claimed: 2015-04-09
- Assignees: Huawei Technologies Co., Ltd.
- Applicants: Huawei Technnoloties Co., Ltd.
- Inventors: Yanmei Yang; Yizhuang Wu; Cuili Ge
- Web page: https://patentgrep.com/patent/US20190380010A1

## CPC

- H04W 4/08: User group management
- H04L 12/18: for broadcast or conference {, e.g. multicast}
- H04W 4/10: Push-to-Talk [PTT] or Push-On-Call services
- H04W 76/45: for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services
- H04W 84/08: Trunked mobile radio systems
- H04W 4/90: Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A multi-group call setup method and device are disclosed. The method includes determining, by a first MCPTT server, to set up a multi-group call involving N MCPTT groups, where N is an integer greater than or equal to 2, and sending, by the first MCPTT server, a call message to first UE, where the call message is used to add the first UE to the multi-group call, where a first MCPTT user is an associated user of the first UE, and where the first MCPTT user is an MCPTT user in the N MCPTT groups.

## Claims

### Claim 1

A multi-group call setup method, comprising:
receiving, from a second user equipment (UE), by a first mission critical push to talk (MCPTT) server of a temporary group comprising N MCPTT groups, a multi-group call setup message for setting up a multi-group call involving the N MCPTT groups, wherein the second UE is associated with a second MCPTT user which is an MCPTT user in a group of the N MCPTT groups, wherein N is an integer greater than or equal to 2; and
sending, by the first MCPTT server, a first paging message to a second MCPTT server of an MCPTT group to which a first MCPTT user belongs, wherein the first MCPTT user is an associated user of a first UE, wherein the MCPTT group to which the first MCPTT user belongs is a group in the N groups, and wherein the first paging message causes the second MCPTT server to send a second paging message to the first UE paging the first UE to join the multi-group call.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the method further comprises:
sending, by the second MCPTT server according to the first paging message, the second paging message to the first UE.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the multi-group call setup message comprises an identifier of the temporary group.

### Claim 4 (depends on 3)

The method according to claim 3, wherein the first paging message comprises the identifier of the temporary group.

### Claim 5 (depends on 4)

The method according to claim 4, wherein the first paging message further comprises an identifier of the first MCPTT user.

### Claim 6 (depends on 3)

The method according to claim 3, wherein the method further comprises:
obtaining, by the first MCPTT server, information about the temporary group according to the identifier of the temporary group, wherein the information about the temporary group comprises identifiers of the N MCPTT groups.

### Claim 7 (depends on 6)

The method according to claim 6, wherein the information about the temporary group further comprises information about an MCPTT user in at least one of the N MCPTT groups.

### Claim 8 (depends on 7)

The method according to claim 7, wherein the information about the MCPTT user comprises at least one of:
an identifier of the first MCPTT user; or
an identifier of the first MCPTT user and location information of the first MCPTT user.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the method further comprises:
receiving, by the second MCPTT server, from the first UE, a response message responsive to the second paging message, wherein the response message indicates that the first UE refuses or agrees to join the multi-group call.

### Claim 10

A mission critical push to talk (MCPTT) system, comprising:
a first MCPTT server of a temporary group comprising N MCPTT groups; and
a second MCPTT server of an MCPTT group to which a first MCPTT user belongs, wherein the MCPTT group to which the first MCPTT user belongs is a group in the N MCPTT groups, wherein N is an integer greater than or equal to 2;
wherein the first MCPTT server is configured to:
receive, from a second user equipment (UE), a multi-group call setup message for setting up a multi-group call involving the N MCPTT groups, wherein the second UE is associated with a second MCPTT user which is an MCPTT user in a group of the N MCPTT groups; and
send a first paging message to the second MCPTT server, wherein the first paging message causes the second MCPTT server to send a second paging message to a first UE paging the first UE to join the multi-group call, wherein the first UE is associated with the first MCPTT user.

### Claim at position 11 (depends on 10)

. The MCPTT system according to claim 10, wherein the second MCPTT server is configured to send the second paging message to the first UE according to the first paging message.

### Claim 12 (depends on 10)

The MCPTT system according to claim 10, wherein the multi-group call setup message comprises an identifier of the temporary group.

### Claim 13 (depends on 12)

The MCPTT system according to claim 12, wherein the first paging message comprises the identifier of the temporary group.

### Claim 14 (depends on 13)

The MCPTT system according to claim 13, wherein the first paging message further comprises an identifier of the first MCPTT user.

### Claim 15 (depends on 12)

The MCPTT system according to claim 12, wherein the first MCPTT server is further configured to obtain information about the temporary group according to the identifier of the temporary group, wherein the information about the temporary group comprises identifiers of the N MCPTT groups.

### Claim 16 (depends on 15)

The MCPTT system according to claim 15, wherein the information about the temporary group further comprises information about an MCPTT user in at least one of the N MCPTT groups.

### Claim 17 (depends on 16)

The MCPTT system according to claim 16, wherein the information about the MCPTT user comprises at least one of:
an identifier of the first MCPTT user; or
an identifier of the first MCPTT user and location information of the first MCPTT user.

### Claim 18 (depends on 10)

The MCPTT system according to claim 10, wherein the second MCPTT server is further configured to receive, from the first UE, a response message responsive to the second paging message, wherein the response message indicates that the first UE refuses or agrees to join the multi-group call.

### Claim 19

A multi-group call setup method, comprising:
receiving, from a second user equipment (UE), by a first mission critical push to talk (MCPTT) server of a temporary group comprising N MCPTT groups, a multi-group call setup message for setting up a multi-group call involving the N MCPTT groups, wherein the second UE is associated with a second MCPTT user which is an MCPTT user in a group of the N MCPTT groups, and wherein N is an integer greater than or equal to 2; and
sending, by the first MCPTT server, a first notification message to a second MCPTT server of an MCPTT group to which a first MCPTT user belongs, wherein the first notification message causes the second MCPTT server to send a second notification message to a first UE instructing the first UE to join the multi-group call, wherein the first MCPTT user is associated with the first UE, and wherein the MCPTT group to which the first MCPTT user belongs is a group in the N MCPTT groups.

### Claim 20 (depends on 19)

The method according to claim 19, wherein the method further comprises:
sending, by the second MCPTT server, the second notification message to the first UE according to the first notification message.