JP3146714U - Apparatus for performing push-to-talk through session initiation protocol SIP and multicast RTP - Google Patents

Abstract

An apparatus for enforcing push-to-talk through a session initiation protocol and multicast RTP.
An utterance user end presses a "call" button and generates a PTT invitation message (through a SIP invitation or message). The PTT invitation message is transmitted to the SIP server 24 from the utterance user end. The PTT invitation message is transmitted from the SIP server 24 to the PTT server 28, the group list 29 stored in the PTT server 28 is checked, and a plurality of receiving user ends linked to the uttering user end are confirmed. The PTT server 28 sends a PTT invitation message to a plurality of receiving user ends. The PTT server 28 arbitrates the authentication / billing of each user end, converts the unicast authentication / billing and talk burst packet to multicast RTP, and then broadcasts it to all user ends.
[Selection] Figure 1

Description

  The present invention relates to a push-to-talk (PTT) device, and in particular, using a network infrastructure, a Session Initiation Protocol (SIP) Internet voice telephone (Voice over Internet Protocol, VoIP). It relates to technology for executing push-to-talk through the system.

Push-to-talk (PTT) technology is typically used in a walkie-talkie device.
When the user end speaks into the transceiver microphone, the transceiver button must be pressed and held down.
On the other hand, other user ends can hear it through their transceiver speakers.
With the development of mobile phone networks, recently, mobile phone companies such as 3G and GPRS networks are planning to provide PTT services in mobile phones.

In recent years, LANs (Local Area Networks, LANs), in particular, wireless LANs have spread dramatically, and the use of Internet voice telephones (VoIP) has been increasing as the Internet access population has increased.
The Session Initiation Protocol (SIP) is an immediate communication protocol used by VoIP, and can support other multimedia such as instant messages, images, online games, and the like.

Unfortunately, however, currently PTT communication sessions cannot be enforced through Session Initiation Protocol (SIP) Internet Voice Telephone (VoIP) technology using a large number of LANs.
Thus, users who wish to communicate through PTT can only use traditional transceivers or use mobile phones that provide this special service.
However, the traditional transceiver has a limited communication range, and there is a problem that a fee must be paid to execute a PTT communication session using a mobile phone.
Furthermore, since both cannot use the network, they cannot communicate with people all over the world through the network.

The present invention provides an apparatus for enforcing push-to-talk through Session Initiation Protocol (SIP) and Multicast RTP (Multicast RTP).
When the utterance user end presses a “Talk” button, a PTT invitation SIP message is generated, and the utterance user end transmits a unicast PTT invitation SIP message to the SIP server.
The SIP server transmits the PTT invitation message to the PTT server, checks a group list stored by the PTT server, and confirms a plurality of user ends linked to the uttering user end.
A unicast PTT invitation message is sent from the PTT server to the plurality of receiving user ends, and the PTT server receives the PTT invitation message from one or a plurality of receiving user ends of the plurality of user ends. Make sure.
The PTT server uses a unicast-multicast conversion mechanism of Real-time Transport Protocol (RTP) and handles call token management.
The user end that has obtained the authentication sends a unicast RTP PTT talk burst to the PTT server, which corresponds to the unicast RTP PTT talk burst received from the speaking user end, and The unicast RTP PTT talk burst is converted to a multicast RTP PTT talk burst.
Moreover, the PTT server broadcasts the multicast RTP PTT talk burst to the receiving user end.

In an embodiment of a push-to-talk (PTT) communication device using Session Initiation Protocol (SIP) Internet Voice Telephone (VoIP), the device comprises a speaking user end, a SIP server, and a PTT server.
The speaking user end generates a PTT invitation message (which can be a SIP invitation or a message).
The SIP server receives the PTT invitation message from the speaking user end.
The PTT server receives the PTT invitation message from the SIP server, and the PTT server routes the PTT invitation message to a plurality of receiving user ends.
The plurality of receiving user ends are linked to the speaking user end.
The group list is stored in the PTT server and checked.
In addition, the PTT server receives an acknowledgment of the PTT invitation message of one or many of the receiving user ends, and receives the uttering user end and the receiving user end confirming the PTT invitation message. During this period, a PTT communication session is established.

After setting up (initiating) the PTT communication session, all user ends in the group list can press the “call” button and send the unicast authentication-to-request RTP packet to the By sending to the PTT server, the PTT server selects the authenticated user end, converts the user end unicast authentication-solicited RTP to multicast RTP, and forwards it to all user ends. .
Only the source ID (Source ID) in the multicast RTP packet received by the user end that has acquired the authentication is from itself and can subsequently issue a talk burst.

Any user end wishing to talk can press the call button and send a unicast RTP PTT talk burst to the PTT server.
The PTT server converts the unicast RTP PTT talk burst into a multicast RTP PTT talk burst.
The PTT server also broadcasts the multicast RTP PTT talk burst to the receiving user end.

The user end of the group can send a SIP message to the PTT server at any time and request to join or leave the PTT communication session.
Whenever a subscribed user end requests to join or leave the PTT communication session, the PTT server will send out a multicast RTP message and notify all subscribed user ends.

The invention of claim 1 includes a plurality of user ends, a SIP server, and a PTT server, wherein the plurality of user ends includes a speaking user end and a receiving user end, and one of the speaking user ends is a PTT invitation message. Occur and
The SIP server receives a PTT invitation message from the utterance user end,
The PTT server sends a PTT invitation message received from the SIP server to a plurality of receiving user ends, and receives confirmation notification of one or a plurality of receiving user ends among the receiving user ends. A PTT communication session is set up between the uttering user end and the receiving user end that confirmed the PTT invitation message, and the PTT server stores a group list, and among them, a plurality of receiving users connected to the uttering user end At the end,
After launching a PTT communication session, all user ends in the group list can start a conversation, the speaking user end transmits a unicast RTP authentication-billing, and also follows the PTT server from the RTP PTT talk burst, The PTT server converts a unicast RTP to a multicast RTP authentication-solicited PTT talk burst, and the PTT server broadcasts the multicast RTP to the receiving user end through push-to-peer through a session initiation protocol SIP and multicast RTP.・ It is a device that executes a talk.
The device of claim 2 is a device for executing push-to-talk through the session initiation protocol SIP and multicast RTP according to claim 1, wherein each of the plurality of user ends has a call button, and the unicast RTP authentication− Push-to-talk through session initiation protocol SIP and multicast RTP, where it is possible to request authentication from a PTT server when generating a solicitation and talk burst and thus pressing the call button It is a device to execute.
The device of claim 3 is an apparatus for performing push-to-talk through the session initiation protocol SIP and multicast RTP according to claim 2, and when the speaking user end releases the call button, the PTT server is connected to the speaking user end. The apparatus is configured to execute push-to-talk through a session initiation protocol SIP and multicast RTP, which is characterized by regaining the authentication.
The device of claim 4 is a device for performing push-to-talk through the session initiation protocol SIP and multicast RTP according to claim 2, wherein the PTT server establishes a queue, and unicast RTP authentication from different user ends— The apparatus executes push-to-talk through a session initiation protocol SIP and multicast RTP, which stores and arbitrates billing packets.
The device according to claim 5 is an apparatus for performing push-to-talk through the session initiation protocol SIP and multicast RTP according to claim 4, wherein the queue in the PTT server applies a priority rule to prioritize different user ends. It is an apparatus for enforcing push-to-talk through session initiation protocol SIP and multicast RTP, which distributes the ranks and distributes the positions in the queue to them based on the individual priorities of the user end .
The device of claim 6 is an apparatus for performing push-to-talk through session initiation protocol SIP and multicast RTP according to claim 1, wherein the PTT server broadcasts multicast RTP PTT talk bursts to all user ends simultaneously. It is an apparatus that executes push-to-talk through the session initiation protocol SIP and multicast RTP.
The device of claim 7 is an apparatus for executing push-to-talk through the session initiation protocol SIP and multicast RTP according to claim 1, wherein the utterance user end transmits broadcast information using half-duplex communication. It is an apparatus that executes push-to-talk through the session initiation protocol SIP and multicast RTP.
The device of claim 8 is an apparatus for performing push-to-talk through the session initiation protocol SIP and multicast RTP according to claim 1, wherein the receiving user end supports an automatic response, and a PTT invitation message from the speaking user end. It is an apparatus for executing push-to-talk through a session initiation protocol SIP and multicast RTP characterized by automatically confirming reception.
The invention of claim 9 is an apparatus for enforcing push-to-talk through the session initiation protocol SIP and multicast RTP of claim 1, wherein the plurality of user ends conform to one or more IEEE 802.11x network standards. At least one of the wireless Internet telephones is a device that executes push-to-talk through the session initiation protocol SIP and multicast RTP.
The invention of claim 10 is an apparatus for executing push-to-talk through the session initiation protocol SIP and multicast RTP according to claim 1, wherein the plurality of user ends are Internet voice telephones. The device executes push-to-talk through SIP and multicast RTP.

  The present invention allows a user end of these phones to execute a PTT communication session by simply performing a simple software (or firmware) upgrade on an existing WiFi phone (Wireless Fidelity, WiFi) or VoIP phone. be able to. Furthermore, in the present invention, the user end can enter a multicast PTT communication session simply by adding a PTT server into the existing network infrastructure.

FIG. 1 is a block chart illustrating a state in which push-to-talk (PTT) communication is installed in a communication device 10 in an embodiment of the present invention. As shown in FIG. 1, a communication device 10 according to an embodiment of the present invention includes a session initiation protocol (SIP) server 24.
The SIP server 24 communicates with a plurality of Internet telephone user ends 20, 36, 38, 40 through, for example, a LAN, a wireless LAN, or an Internet computer network.
The SIP server 24 is connected to a public switched telephone network (PSTN) 44 through a gateway 42.
The Internet phone user end 20, 36, 38, 40 (communication device) is a wireless Internet phone, and the wireless Internet phone is at least one Internet phone that conforms to the IEEE 802.11x network standard (VoIP over Internet Protocol, VoIP), or It is preferably a WiFi telephone (Wireless Fidelity, WiFi).
Accordingly, the Internet telephone user ends 20, 36, 38, 40 are connected to the public telephone network (PSTN) 44 through the SIP server 24 and the gateway 42 to complete a normal telephone call.

The PTT communication session device includes a PTT server 28 that can establish or initiate a multicast PTT communication session in different Internet telephone user ends 20, 36, 38, 40.
In fact, any existing VoIP or WiFi phone can accept simple software or formware upgrades, thereby providing push-to-talk (PTT) communication capabilities.
At this time, the SIP server 24 also needs to accept the software or formware upgrade, so that the PTT communication session function can be provided in the law of the SIP VoIP communication system.

The PTT server 28 manages a PTT communication session and manages a group list 29 of different Internet phone user ends 20, 36, 38, 40.
Each group list 29 includes a list of special user ends, and all other user ends that can receive a multicast PTT communication session can be interconnected within this group.

If the Internet phone user end 20, 36, 38, 40 is upgraded and has a PTT communication session function, a specific “Talk” button is installed on each user end (communication device).
As a result, the PTT communication session is turned on and off.
The user end of the user who has previously pressed the “call” button sends an invitation message to the other user ends in the group to turn on the PTT communication session.
When a user tries to make a call with another user end in the group list 29,
The user can press and hold the designated “call” button while speaking.

FIG. 2 is used to explain the operation of the PTT communication session device of the present invention in more detail.
FIG. 2 is a flowchart illustrating a procedure for starting, joining, and leaving a multicast PTT communication session according to an embodiment of the present invention.
The steps included in this flowchart will be described below.
Step 100: Press the "call" button 21 on the A user end 20 (speaking user end) to generate a PTT message 22 (initial PTT message).
Step 102: The PTT message 22 is transmitted from the A user end 20 to the SIP server 24.
Step 104: Transmit the PTT message 26 from the SIP server 24 to the PTT server 28.
Step 106: Further, PTT messages 30, 32, 34 are transmitted from the PTT server 28 to the user ends 36, 38, 40 (or more receiving user ends) from B to D. The user ends 36, 38, and 40 are user ends confirmed from the group list 29 stored in the PTT server 28.
Step 108: The PTT server 28 receives an acknowledgment of receipt of the PTT message from one or many of the user ends 36, 38, 40 from B to D. The user end confirmed to receive the notification immediately joins the multicast PTT communication session. An offline user end can join a multicast PTT communication session by sending a SIP message to the PTT server.
Step 110: When a new user end wants to join a multipoint PTT communication session, or an already subscribed user end wants to leave a multicast PTT communication session, both user ends send a SIP message to the PTT. The server 28 is notified.
In response to this, the PTT server 28 notifies the modification information of the subscribed user end to all other subscribed user ends by multicast RTP packets.

If the receiving user end has an auto answering function, the user end automatically confirms reception of the PTT invitation message from the transmitting user end.
If an automatic answering function is not provided or a telephone of a certain user end is offline (not logged on to the SIP server 24), it can be confirmed using a manual operation.

When the number of user ends that frequently participate in the PTT communication session is increasing, the probability that two or more user end users will talk simultaneously increases.
The management of the PTT authentication shown in FIG.
For example, if the PTT server 28 receives unicast authentication-solicited RTP packets from the B user end and the C user end at the same time, the PTT server 28 uses the RTP packet queue 31 and at each time, the queue 31 According to the priority order, authentication requests received from different user ends are processed and arbitration is performed.
Queue 31 is a traditional first-in-first-out (FIFO) queue, or can be configured for user-end authentication claims based on user-end priorities, or a combination of the two Alternatively, other queue schemes can be used.
The PTT server 28 uses arbitration, decides to give authentication to its subscribed user end, and converts unicast authentication-solicited RTP to multicast authentication-solicited RPT.
It also abandons other authentication-billing RTP and then broadcasts to all users.

To further explain the authentication transmission scheme, FIG. 4 is used.
FIG. 4 is a flowchart illustrating a method of switching from unicast to multicast of authentication and talk burst RTP packets according to an embodiment of the present invention.
As shown in FIG. 4, when the user end obtains authentication from the PTT server 28, the user end transmits a multicast message to another user end.
The steps included in the above flowchart will be described below.
Step 150: Assuming that A user end 20, B user end 36, C user end 38, D user end 40 have all joined the PTT multicast communication and they are all preparing to initiate push-to-talk To do.
Step 152: The B user end 36 and the C user end 38 press the call button 50 to turn it on, and transmit an authentication-billing unicast RTP packet to the PTT server 28.
Step 154: The PTT server 28 selects one of the user ends (eg, C user end), and obtains authentication based on the FIFO principle.
Moreover, only the request of the C user end is transmitted and diverted to be multicast RTP and broadcast to all user ends.
Step 156: All user ends receive the multicast packet and check whether its source ID is itself.
If so, it means that the user end has obtained authentication, if so, it hears audio or the LED lights up.
Step 158: Subsequently, only the authenticated user end (C user end) can send the talk burst unicast RTP to the PTT server 28.
Moreover, the PTT server 28 converts the unicast RTP to the multicast RTP and broadcasts it to all user ends (including A, B, C, and D user ends).
Step 160: All user ends can hear the multicast RTP sudden discourse.

In the flowchart of step 156 above, the C user end 38 receives the authentication-billing RTP it generates. This is confirmation, and the authentication it receives is the message generated by the “call” button 50 that the user of the C user end 38 pressed at that time.
If two user ends are soliciting the authentication at the same time, only one of the user ends can receive the authentication and can generate a multicast authentication-solicited RTP.
In this embodiment, the users of the two user ends need to listen to the multicast RTP broadcast in step 156 and thus must check whether their user ends have obtained their authentication. .
Only the user end that obtained the authentication (eg, C user end) can issue a talk burst during step 158.
Moreover, the PTT server 28 converts the talk burst into multicast RTP and broadcasts it to all user ends.

During steps 158 and 160 described above, C user end 38 sends a unicast RPT PTT talk burst to PTT server 28.
Moreover, the PTT server 28 converts the unicast RPT PTT talk burst into a multicast RPT PTT talk burst and broadcasts the multicast RPT PTT talk burst to all subscribed user ends.
However, in other embodiments, the present invention can bypass the PTT server 28.
That is, in the embodiment described above, the C user end 38 can choose to route multicast RPT PTT talk bursts directly to all other subscriber user ends, and does not need to go through the PTT server 28.

Since the PTT communication session is a one-way broadcast, the message is broadcast using half-duplex communication.
Since the homogenous network basic structure used by the VoIP telephone call can also be used in the multicast PTT communication session, the multicast PTT communication session feels a latency similar to that of the VoIP telephone call. This is an acceptable delay.

As described above, the PTT server 28 manages the group list 29 and includes each group list 29.
Includes a group of participating member user clients.
The member user end can join or leave the group list 29 through the user interface managed by the PTT server 28.
For example, the user can log in to the PTT server 28 through the interface of the Internet site and create (or activate) a new group list 29. Alternatively, the current group list 29 can be deleted, or the existing group list 29 can be edited to increase or delete the member user end.

  As described above, the present invention can add a PTT server to an existing VoIP network, thereby providing a PTT function. SIP servers, VoIP phones, and WiFi phones can support this new function with a slight software (or firmware) upgrade. Therefore, the present invention can provide a SIP VoIP network that is simple and provides an effective technique and has a PTT communication session function.

4 is a block diagram of a PTT communication session device in an embodiment of the present invention. 4 is a flowchart illustrating a procedure for starting, joining, and leaving a PTT communication session according to an embodiment of the present invention. 5 is a block chart illustrating PTT authentication management in an embodiment of the present invention. 6 is a flowchart illustrating a method for switching from unicast to multicast of authentication and talk burst RTP packets in an embodiment of the present invention.

Explanation of symbols

10 Communication device 21 Call button 24 Session initiation protocol (SIP) server 20 User end 22 PTT message 26 PTT message 28 Push-to-talk (PTT) server 29 Group list 30 Push-to-talk (PTT) message 31 RTP packet queue (Queue)
32 PTT message 34 PTT message 36 B Internet telephone user end 38 C Internet telephone user end 40 D Internet telephone user end 42 Gateway 44 Public telephone network 50 Call button 100, 102, 104, 106, 108, 110, 150, 152, 154 156, 158, 160 steps

Claims (10)

Equipped with multiple user ends, SIP server, PTT server,
The plurality of user ends include an utterance user end and a reception user end, and one of the utterance user ends generates a PTT invitation message,
The SIP server receives a PTT invitation message from the utterance user end,
The PTT server sends a PTT invitation message received from the SIP server to a plurality of receiving user ends, and receives confirmation notification of one or a plurality of receiving user ends among the receiving user ends. A PTT communication session is set up between the uttering user end and the receiving user end that confirmed the PTT invitation message, and the PTT server stores a group list, and among them, a plurality of receiving users connected to the uttering user end At the end,
After launching a PTT communication session, all user ends in the group list can start a conversation, the speaking user end transmits a unicast RTP authentication-billing, and also follows the PTT server from the RTP PTT talk burst, The PTT server converts a unicast RTP to a multicast RTP authentication-solicited PTT talk burst, and the PTT server broadcasts the multicast RTP to the receiving user end through push-to-peer through a session initiation protocol SIP and multicast RTP. -A device that executes a talk.   2. The apparatus for performing push-to-talk through session initiation protocol SIP and multicast RTP according to claim 1, wherein each of the plurality of user ends has a call button, and generates the unicast RTP authentication-billing and talk burst. An apparatus for executing push-to-talk through the session initiation protocol SIP and multicast RTP, wherein the authentication can be requested from the PTT server when the call button is pressed in this way.   3. The apparatus for performing push-to-talk through session initiation protocol SIP and multicast RTP according to claim 2, wherein the PTT server regains the authentication from the speaking user end when the speaking user end releases the call button. A device that executes push-to-talk through the session initiation protocol SIP and multicast RTP.   3. The apparatus for performing push-to-talk through session initiation protocol SIP and multicast RTP according to claim 2, wherein the PTT server establishes a queue, unicast RTP authentication from different user ends—stores and arbitrates billing packets An apparatus for executing push-to-talk through a session initiation protocol SIP and multicast RTP.   5. The apparatus for enforcing push-to-talk through session initiation protocol SIP and multicast RTP according to claim 4, wherein the queue in the PTT server applies a priority rule, distributes priority to different user ends, and user An apparatus for enforcing push-to-talk through session initiation protocol SIP and multicast RTP, characterized in that based on the individual priorities of the ends, the positions in the queue are distributed to them.   2. The apparatus for performing push-to-talk through session initiation protocol SIP and multicast RTP according to claim 1, wherein the PTT server simultaneously broadcasts multicast RTP PTT talk bursts to all user ends. A device that enforces push-to-talk through protocols SIP and multicast RTP.   2. The apparatus for performing push-to-talk through session initiation protocol SIP and multicast RTP according to claim 1, wherein said utterance user end transmits broadcast information using half-duplex communication. A device that enforces push-to-talk through protocols SIP and multicast RTP.   2. The apparatus for performing push-to-talk through session initiation protocol SIP and multicast RTP according to claim 1, wherein said receiving user end supports automatic response and automatically confirms reception of a PTT invitation message from the speaking user end. An apparatus for performing push-to-talk through a session initiation protocol SIP and multicast RTP.   2. The apparatus for performing push-to-talk through session initiation protocol SIP and multicast RTP according to claim 1, wherein the plurality of user ends conform to one or more IEEE 802.11x network standards, at least one of them. A device that enforces push-to-talk through session initiation protocol SIP and multicast RTP, characterized in that it is a single wireless internet phone.   2. The apparatus for performing push-to-talk through session initiation protocol SIP and multicast RTP according to claim 1, wherein the plurality of user ends are Internet voice telephones. A device that performs two-talk.

Images