KR20050114565A - Apparatus and method for paging the subscriber in ptt service network - Google Patents

Abstract

The present invention is to facilitate a call when any push-to-talk (PTT) service subscriber calls a plurality of subscribers, and when the calling party wants to call a plurality of subscribers, Transmit a call message including all information about the plurality of called party subscribers, and the PTT over Cellular (PoC) server receiving the call message transmits the call message to each of the plurality of called party subscribers included in the call message. The present invention proposes an apparatus and method for subscriber calling in a PTT service network.

Description

Apparatus and method for calling subscriber in PPT service network {APPARATUS AND METHOD FOR PAGING THE SUBSCRIBER IN PTT SERVICE NETWORK}

The present invention relates to a subscriber calling apparatus and method in a PTT service network, and more particularly, to a subscriber calling apparatus and method capable of calling a plurality of subscribers.

PTT (Push To Talk) service is an instant messenger service like a radio service. PTT service is a service that allows the subscriber to communicate immediately by pressing the switch of the terminal as the meaning of the word immediately, it can provide a relatively very fast communication service compared to the standby time of the general mobile phone. In addition, in the case of targeting a group in the PTT service, one PTT service subscriber can hear many other subscribers using their own terminals, which means that the phone has overcome the limitation of one-to-one communication. have. Subscribers to the PTT service can designate small and medium-sized groups on a conversational basis, and of course, one-on-one wireless communication is also possible.

PTT is based on SIP (Session Initiation Protocol), which is a text-based application level protocol. SIP has been adopted by many systems because of its simple structure and extensibility compared to the existing protocol. . SIP is the signaling protocol used to literally connect sessions. SIP can be used for video telephony, multimedia, and online game connectivity, as well as Internet telephony. Adopted as a standard RFC, starting with RFC 2543, it is now updated to RFC 3261.

Hereinafter, a PTT service network for providing a PTT service to a subscriber will be described with reference to the accompanying drawings.

1 is a configuration diagram of a PTT service network.

1 is a PoC (PTT over Cellular) network that implements a PTT service based on a cellular network. As shown in FIG. 1, the PoC service network includes a PTT over Cellular (PoC) client (100), an access network (110), a SIP / IP core (120), a PoC server (130), and a Group and List Management Server (GLMS). 140), Presence Server 150 and Remote PoC Network (160).

Here, the PoC client 100 is a terminal requesting a service and transmits or receives a paging message. Unless otherwise stated, the term PoC client 100 is used in the same sense as a PTT service subscriber.

An access network 110 refers to an access network of an existing cellular network. For example, a base station transceiver system (BTS), a base station controller (BSC) and a packet data switching network (PDSN) of the IS-95 and the CDMA 2000 may correspond to the access network. Through such an access network, the PoC client 100 can access the PoC network based on IP.

The Session Initiation Protocol / Internet Protocol (SIP / IP) core 120 performs message delivery and registration procedures of the PoC client 100 with respect to the PoC service network. The SIP / IP core 120 is connected with the PDSN of the access network 110. SIP / IP core 120 may also be referred to as a proxy.

The PoC server 130 receives a SIP message from the SIP / IP core 120 and performs call processing corresponding to a service after interworking with the GLMS 140.

The Group and List Management Server (GLMS) 140 stores member information about a group registered by the PoC client 100, that is, information of a PTT service subscriber. The GLMS 140 transmits the group member information (for example, subscriber ID, terminal number, etc.) to the PoC server 130 at the request of the PoC server 130.

Presence server 150 is a server that stores status information, such as whether a PTT service subscriber is online and its location, and notifies users who want this information by registering / maintaining their current location. To enable immediate communication services.

Components of such a PTT service network may be connected by It, Itn, Is, If, In, Im, Ik, Ipl and Ips interfaces, as shown in FIG. Where It and Itn are interfaces used for floor control and media processing. Is is an interface used for session signaling between the PoC client 100 and the SIP / IP core 120. If is an interface used for session signaling between the SIP / IP core 120 and the PoC server 130. In is an interface used for session signaling between the SIP / IP core of the calling party and the SIP / IP core of the called party. Im is the interface used for group management for PoC clients. Ik is an interface used for group management for the PoC server 130. Finally, Ipl and Ips are interfaces used to provide subscriber access information to GLMS 140 and SIP / IP core 120.

The remote PoC network 160 connected to the PoC server 130 and the SIP / IP core 120 through the Itn and In interfaces has the same configuration of the PoC client 100 to the Presence Server 150 described above.

On the other hand, the PTT service provides an Instant Personal Alert service (hereinafter referred to as "calling service") that allows any subscriber to call another subscriber. In the calling service, when the service subscriber sends an Alert request message from the PTT client 100 to the PTT server 120 to call another PTT service subscriber, the calling subscriber transmits the calling message to the called subscriber through the SIP / IP core 120. . The call service provided by the PTT service will be described with reference to FIG. 2 below.

2 is a signal flow diagram according to a subscriber call in a PTT service network.

As shown in FIG. 2, the PoC client 100 receives an Alert Request message, which is one of SIP messages, from a subscriber (hereinafter, referred to as a "calling party subscriber") who wants to call another PTT service subscriber in step 201. The message received in step 203 is transmitted to the SIP / IP core 120. In step 205, the SIP / IP core 120 transmits a message received from the PoC client 100 to the PoC server 130. In step 207, the PoC server 130 transmits the message received from the SIP / IP core 120 to which the calling party belongs to the SIP / IP to which the PTT service subscriber (hereinafter referred to as "called party") to which the calling party belongs. Transmit to IP core 200. In step 209, the SIP / IP core 200 transmits a message received from the PoC server 130 to the PoC client 210 to which the called party subscriber belongs.

The PoC client 210 receiving the message from the SIP / IP core 200 transmits an Alert Indication message to the called party's subscriber in step 211. In addition, the PoC client 210 transmits a 200 OK message to the SIP / IP core 200 indicating that the called party subscriber is called in step 213. A 200 OK message is sent from the PoC server 130 to the SIP / IP core 120 to which the calling party belongs from the PoC server 130 from the SIP / IP core 200 to which the called party belongs to inform the result of the call. , From the SIP / IP core 120 to the PoC client 100, to the PoC client 100. Upon receiving the 200 OK message, which is a response of the call message, from the SIP / IP core 120, the PoC client 100 notifies the first subscriber of the result of the call by transmitting an Alert Delivery Indication message to the calling subscriber in step 221.

As shown in Fig. 2, in the conventional PTT service network, the call target was a single subscriber. Thus, in order for any PTT service subscriber to call a plurality of subscribers, a call message must be individually transmitted to each of a plurality of subscribers to be called. That is, when any calling party wants to call a plurality of called party subscribers, all of the called party subscribers who want to call the process of calling a single called party subscriber shown in FIG. 2 should be performed. .

In such a conventional calling method, a problem arises that the calling party that wants to call a plurality of called party subscribers has to transmit a call message to each of the called party subscribers. In addition, since each call message occupies a resource for transmission, a problem arises that waste of unnecessary resources occurs.

Accordingly, an object of the present invention to solve such problems is to provide a subscriber calling method in a PTT service network that can easily call a plurality of called party subscribers.

Another object of the present invention is to provide a subscriber calling method in a PTT service network that can efficiently call a plurality of called party subscribers without wasting resources in the PTT service network.

In order to achieve the above objects, the present invention provides a method for calling multiple subscribers in a PTT service network, characterized in that a plurality of called subscribers are collectively called in a PTT service network.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The present invention is directed to sending a paging message to a plurality of subscribers simultaneously when any PTT service subscriber calls a plurality of subscribers. Through the present invention, a subscriber can transmit a call message to all of a plurality of designated subscribers by transmitting a call message once. In addition, through the present invention, it is possible to provide a function of calling members of a predetermined group defined in the PTT service.

To this end, the subscriber station calling apparatus in the PTT service network proposed by the present invention includes a calling party terminal transmitting a call message that designates a plurality of called party subscriber terminals as a call target, and a call message from the calling party subscriber terminal. If the received call message is a message designating a plurality of called party subscriber stations, a push to talk (PTT) including a PoC server for transmitting a call message to each of a plurality of called party subscriber stations specified in the call message. A subscriber station calling device in a service network.

In addition, the subscriber station call method in the PTT service network proposed by the present invention includes a first process of receiving a call message sent by a calling party subscriber station, and the received call message calls a plurality of called party subscriber stations. A push to talk (PTT) including a second process of determining whether the message is a message, and a third process of transmitting a call message to each of the plurality of called party subscriber terminals if the message is a message calling a plurality of called party subscriber terminals. Calling subscriber station in service network.

This invention can be applied in the PTT service network shown in FIG. The network to which the present invention is applied will be described with reference to FIG. 1 as follows.

1 is a block diagram of a PTT service network for applying the present invention.

The PoC client 100 of FIG. 1 is a subscriber station requesting a service and transmits or receives a call message. In the present invention, since the origination and reception for the call is made through the subscriber terminal, unless otherwise stated, the term "subscriber" will be used in the meaning of the subscriber terminal. An access network 110 refers to an access network of an existing cellular network. The PoC client 100 can access the PoC service network through the access network. The Session Initiation Protocol / Internet Protocol (SIP / IP) core 120 performs message delivery and registration procedures of the PoC client 100 with respect to the PoC service network. The PoC server 130 receives a SIP message from the SIP / IP core 120 and performs call processing corresponding to a service after interworking with the GLMS 140. The Group and List Management Server (GLMS) 140 stores member information about a group registered by the PoC client 100. The GLMS 140 transmits the member information of the group to the PoC server 130 at the request of the PoC server 130. Presence Server 150 stores the state of the service subscriber.

The remote PoC network 160 has the same configuration of the PoC client 100 to the Presence Server 150. The called party subscriber may be located in the same PTT service network as the calling party subscriber, or may exist in another remote PoC network 160.

The components of the PTT service network include session signaling between the PoC client 100 and the SIP / IP core 120, It and Itn, which are interfaces used for floor control and media processing. Is an interface used for communication, If is an interface used for session signaling between the SIP / IP core 120 and the PoC server 130, and a session between the SIP / IP core of the calling party and the SIP / IP core of the called party. In the interface used for signaling, Im, an interface used for group management for PoC clients, Ik, an interface used for group management for PoC server 130, and subscriber access information GLMS 140 ) And Ipl and Ips, which are interfaces used to provide to the SIP / IP core 120. The call message used in the present invention may also be transmitted through the interfaces. Hereinafter, the signals mentioned while explaining the present invention will be clear that all are SIP messages.

On the other hand, in order to simultaneously call a plurality of called party subscribers, a plurality of called party subscribers to be called should be designated in a call message transmitted when the calling party constructs a call message.

A method of designating a plurality of called party subscribers in a paging message includes a method according to the first embodiment of transmitting a group ID including a group ID which is already set and information of the members stored in the GLMS 140 in the paging message; For example, the method according to the second embodiment of transmitting information including information on each called party subscriber to be called by the ad-hoc method is included in the call message. A call message format according to each embodiment will be described with reference to FIG. 3 below.

FIG. 3 is a diagram in accordance with the present invention, illustrating a message format including information of called subscribers for collectively calling a plurality of subscribers.

As shown in FIG. 3, in the first embodiment of the present invention, a group ID is included in the destination field of the call message by including the group ID instead of the called party subscriber ID. As such, the PoC server 130 receiving the call message including the group ID from the PoC client 100 transmits the call message to each member belonging to the group. On the other hand, PoC server 130 uses GLMS 140 to obtain information of the members belonging to the group, which will be described in detail in the transmission of the call message according to the present invention to be described later.

In addition, in the case of an Ad-hocGroupRequest according to the second embodiment of the present invention, a plurality of called party subscribers can be designated as Refer-To Content in the context of a paging message. That is, in the second embodiment, information of each of the called party subscribers is included in the call message.

Meanwhile, the call message illustrated in FIG. 3 is a message conforming to SIP (Sessin Initiation Protocol). In addition, since other headers and parameters are the same as those used in the conventional PTT service, description thereof will be omitted.

As shown in FIG. 3, the PoC server 130 receiving the SIP message including the Alerted Global Group Identity in the destination field of the header of the call message, that is, the call message including the group ID according to the first embodiment of the present invention. The GLMS 140 uses GLMS 140 to obtain information about members included in the group, that is, called subscribers. The PoC server 130 receiving the call message including the group ID performs a query on the GLMS 140 to obtain a member list belonging to the group ID. Upon receiving the group member list from the GLMS 140, the PoC server 130 copies the contents to be sent to the called party subscribers from the received call message and designates each member as the called party subscriber to be called. Create a message and send it to each member.

Meanwhile, in the second embodiment, the PoC server 120 receives a call message including information of each of the plurality of destination subscribers from the PoC client 100. Thus, PoC server 120 does not need to use GLMS 140 to obtain information of called party subscribers. The PoC server 120 receiving the call message according to the second embodiment transmits a call message to each of the called party subscribers using the information of the called party subscribers included in the received call message.

A signal flow according to a first embodiment of the present invention will be described with reference to FIG. 4 below.

4 is a signal flow diagram according to a process of collectively calling a plurality of subscribers according to the present invention.

In step 401, the PoC client 100 transmits a call message including the group IDs of the called party subscribers to the PoC server 130. When the PoC server 130 determines that the received call message is a group call message by referring to a destination field of a header of the received call message, the PoC server 130 queries GLMS 140 and corresponds to the group ID included in the call message. Obtain information about group members. At this time, the PoC server 130 uses the SUBSCRIBE message to obtain information. That is, the PoC server 130 transmits a SUBSCRIBE message including the group ID included in the call message received to the GLMS 140 in step 403.

Upon receiving the SUBSCRIBE message from the PoC server 130, the GLMS 140 transmits a 200 OK message to the PoC server 130 as a response signal to the SUBSCRIBE message in step 405. In addition, after retrieving the member information included in the received group ID from the stored group member information, the GLMS 140 transmits a NOTIFY message including the member list according to the search result to the PoC server 130 in step 407. Send.

The PoC server 130 receiving the NOTIFY message from the GLMS 140 transmits a 200 OK signal to the GLMS 140 as a response signal to the NOTIFY message in step 409. Next, the PoC server 130 transmits a call message to each of the called party subscribers (Alerted Client 1 to Alerted Client n) included in the member list with reference to the member list obtained from the GLMS 140 in step 411. The called party subscribers receiving the call message from the PoC server 130 transmit a 200 OK signal to the PoC server 130 as a response signal to the call message in step 413.

On the other hand, in the second embodiment of the present invention, since the call message received by the PoC server 130 includes information of the called party subscribers, the PoC server 130 receiving the call message is a member of the group, that is, the called party. There is no need to query GLMS 140 for information about subscribers. Therefore, in the signal flow according to the second embodiment of the present invention, the query process of steps 403 to 409 illustrated in FIG. 4 may be omitted.

On the other hand, between the first embodiment and the second embodiment, while the first embodiment makes the calling process easier by calling a predetermined group, it is not possible to call the destination subscribers not designated as a group, Since the second embodiment has to designate each of the called party subscribers to call, the calling process is more cumbersome, but there is a difference that a call can be freely performed even for the called party subscribers not designated in advance. The calling party subscriber who wants to perform the subscriber call according to the present invention may select and use a suitable method from the first embodiment or the second embodiment.

In the case of applying the present invention as described above, a separate call message is transmitted from the PoC server 130 to the called party subscribers, but includes information on a plurality of called party subscriptions from the calling party subscriber to the PoC server 130. One call message is sent. Therefore, it is possible to save transmission resources compared to the conventional calling method in which a plurality of call messages are transmitted even in a section from the originating subscriber to the PoC server 130.

As described above, the following effects may be obtained by applying the present invention to the call message function delivered only between individual subscribers. First, the calling party subscriber can call a plurality of called party subscribers with only one call message transmission. Second, unnecessary waste of transmission resources can be prevented. Third, the service provider can increase the profit by providing an extended service using the components of the existing PTT service network.

1 is a block diagram of a push to talk (PTT) service network.

2 is a signal flow diagram of a subscriber call in a PTT service network.

3 is a diagram in accordance with the present invention, the message format used to collectively call a plurality of called party subscribers.

4 is a signal flow diagram according to a subscriber calling process of collectively calling a plurality of called party subscribers in accordance with the present invention.

Claims (11)

An apparatus for calling a subscriber station in a PTT service network, A calling party subscriber station for transmitting a call message for designating a plurality of called party subscriber stations as a call destination; A PoC server that receives a call message from the calling party subscriber station and transmits a call message to each of a plurality of called party subscriber stations specified in the call message if the received call message is a message designating a plurality of called party subscriber stations. Subscriber terminal calling device in a push to talk (PTT) service network comprising a. 2. The apparatus of claim 1, wherein the calling party subscriber station transmits a call message including an ID of a group including the plurality of called party subscriber stations. 2. The apparatus of claim 1, wherein the calling party subscriber station transmits a call message including information of the plurality of called party subscriber stations. The apparatus of claim 1, further comprising a Group and List Management Server (GLMS) for storing information of a predetermined group of PTT service subscriber stations. The called party subscriber of claim 4, wherein the PoC server is a message included in the group from the GLMS if the call message received from the calling party subscriber terminal is a message including an ID of a group including a plurality of called party subscriber terminals. Subscriber terminal calling device in the PTT service network to obtain information about the terminals. The apparatus of claim 5, wherein the PoC server transmits a group ID included in the call message to the GLMS and requests information of called subscriber stations included in the group. The terminal of claim 1, wherein the PoC server uses information of the called party subscriber terminals included in the message if the call message received from the calling party subscriber terminal is a message including information on a plurality of called party subscriber stations. Subscriber station calling device in a PTT service network for transmitting a call message to each of the called subscriber stations. In the subscriber station call method in a PTT service network, A first step of receiving a call message sent by the calling party subscriber station; Determining whether the received call message is a message for calling a plurality of called subscriber stations; If the message is a message for calling a plurality of called party subscriber stations, a method of calling a subscriber station in a push to talk (PTT) service network comprising a third step of transmitting a call message to each of the plurality of called party subscriber stations; . 10. The method of claim 8, wherein if it is determined that the call message received in the second process is a message specifying a plurality of called party subscriber stations, the message includes an ID of a group including a plurality of called party subscriber stations. And determining whether the message includes information on a plurality of called party subscriber stations. 10. The method of claim 9, wherein the group ID is included in a destination field of a header of the received paging message. 10. The receiver of claim 9, wherein when the message is determined to be a message including an ID of a group including a plurality of called party subscriber terminals, a called party subscriber included in the group from GLMS storing information of a group of PTT service subscriber stations. The method of calling multiple subscriber stations in a PTT service network further comprising the step of obtaining information of the terminals.