CN1859636A

CN1859636A - System and method for realizing communication system intercommunication

Info

Publication number: CN1859636A
Application number: CNA2005100699483A
Authority: CN
Inventors: 罗龙
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2005-04-30
Filing date: 2005-04-30
Publication date: 2006-11-08
Also published as: WO2006116943A1

Abstract

The present invention discloses realizing communication system intercommunication system used for realizing intercommunication between PoC service communication system and peripheral communications system. Said system includes at least session control gateway, said session control gateway including signaling gateway and media gateway. The present invention n also provides realizing communication system intercommunication method, to make peripheral communications systematical user able to participate in PoC service.

Description

A kind of system and method for realizing communication system intercommunication

Technical field

The present invention relates to PTT on the cellular system (PoC) business field, particularly be applied in a kind of system and method for realizing communication system intercommunication between PoC service communication system and the Exterior Communications System.

Background technology

PTT (PTT) is a kind of semiduplex mechanics of communication, PTT business (PoC on the cellular system, PTT over Cellular) is the PTT business that on packet network, realizes of Open Mobile Alliance tissue (OMA) definition, adopts packet voice (VoIP) and half-duplex mode to realize.PoC service has been introduced a kind of brand-new communication pattern, and its internet protocol-based (IP) network, cost when satisfying calling in real time, can be accomplished the expense minimum well below common mobile phone speech business.

But the PoC service communication system still can not realize intercommunication with Exterior Communications System at present.At first, based on the PoC service communication system of SIP signaling and IP Media Stream and circuit type communication systems such as Public Switched Telephone Network system or global mobile communication (GSM) system signaling and media data alternately; Secondly, the communication system of non-PoC service is not all supported the management function of the group session information of PoC service, and can't get access to the group session information that is kept in the PoC service communication system, thereby can not successfully set up PoC session, transmission PoC Media Stream etc.; Once more, PoC service is realized half-duplex operation based on right to speak control (Floor Control) agreement, then just can't discern right to speak control signaling, also can't seize right to speak based on the communication system of full duplex technology, even therefore the both sides system can set up session and media stream, the business realizing effect is also unsatisfactory.

As seen, existing P oC service communication system can't realize intercommunication with the communication system of non-PoC service.Like this, be in as the user of signatory PoC service outside the scope of self signatory PoC service communication system, just can't set up PoC session, make troubles for contracted user's use, and the signatory user of non-PoC service more can't insert the PoC service communication system from other communication system, and these drawbacks will limit the expansion of PoC service greatly.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of system and method for realizing communication system intercommunication, makes PoC service communication system and Exterior Communications System realize intercommunication, makes the user who is in Exterior Communications System can use PoC service equally.

For achieving the above object, technical scheme of the present invention is achieved in that

The invention discloses a kind of system that realizes communication system intercommunication, be used to realize the intercommunication of PoC service communication system and Exterior Communications System, the system of this realization communication system intercommunication comprises:

SGW receives the signaling from PoC service communication system or Exterior Communications System, sends signaling to Exterior Communications System or PoC service communication system according to the described signaling that receives, and sends the medium control command to media gateway;

Media gateway, reception is from the media data of PoC service communication system or Exterior Communications System, described media data is carried out protocol conversion and is sent to Exterior Communications System or the PoC service communication system, set up the media delivery path according to medium control command from SGW.

Wherein, the system of described realization communication system intercommunication further comprises: the right to speak control gateway, reception sends the right to speak indication to described Exterior Communications System from the right to speak control signaling of PoC service communication system, and the right to speak indication that receives from described Exterior Communications System sends right to speak control signaling to the PoC service communication system.

Wherein, when the system of described realization communication system intercommunication was the controlled function entity CF of current PoC session, described right to speak control gateway further linked to each other with described media gateway; Described right to speak control gateway further receives from the right to speak control signaling of PoC service communication system with from the right to speak of described Exterior Communications System and indicates, authorize and discharge right to speak, send the right to speak indication to this media gateway according to the situation of authorizing or discharge right to speak, and send right to speak control signaling respectively and right to speak is indicated to PoC service communication system and described Exterior Communications System.

Wherein, this system further comprises: the cluster conversation attribute database, preserve the cluster conversation attribute of each group in the PoC service communication system; When the system of described realization communication system intercommunication is the CF of current PoC session, described SGW further links to each other with described cluster conversation attribute database, sends signaling and medium control command according to the cluster conversation attribute that extracts from this cluster conversation attribute database and from the group user information that the PoC service communication system receives.

Wherein, described Exterior Communications System is global mobile communication gsm system or public switched telephone network (PSTN) PSTN system.

The invention also discloses a kind of method that realizes communication system intercommunication, this method adopts the system of the realization communication system intercommunication that comprises described SGW and media gateway, and this method comprises:

A. SGW receive from the PoC service communication system or from the signaling of the call subscriber terminal of the Exterior Communications System of PoC service communication system intercommunication;

B. the signaling that described SGW receives according to steps A sends the called user terminal of signaling to described Exterior Communications System or PoC service communication system; This SGW sends the medium control command to media gateway according to the signaling that receives, and this media gateway is set up the media delivery path according to the medium control command that receives, and finishes PoC session control;

C. described media gateway receives the Media Stream from PoC service communication system or described Exterior Communications System, and the Media Stream that receives is carried out protocol conversion, and the Media Stream after will changing again is sent to described Exterior Communications System or Poc service communication system.

Wherein, the system of described realization communication system intercommunication further comprises: the cluster conversation attribute database; When the system of this realization communication system intercommunication is the CF of current PoC session; Among the step B, the method that the signaling that described basis receives sends signaling comprises: described SGW obtains the cluster conversation attribute and the group user information of current PoC session from described cluster conversation attribute database and the inquiry of PoC service communication system according to the group identification of current PoC session in the signaling that receives; Determine the called subscriber according to this cluster conversation attribute and group user information, the concurrent order of delivering letters is to determined each called user terminal; When determined called user terminal had both comprised terminal in the PoC service communication system, when also comprising the terminal in the described Exterior Communications System, described SGW sends signaling each called user terminal to determined PoC service communication system and the described Exterior Communications System.

Wherein, the system of described realization communication system intercommunication further comprises: the right to speak control gateway; This method further comprises: described right to speak control gateway receives from the right to speak control signaling of poC service communication system and/or from the right to speak of Exterior Communications System and indicates, the right to speak of determining to obtain the user of right to speak or discharging the user, send the right to speak indication to media gateway, each user terminal of current PoC session sends right to speak control signaling in described PoC service communication system, and/or each user terminal of current PoC session sends the right to speak indication in described Exterior Communications System; Among the step C, media gateway determines to obtain the user of right to speak according to the right to speak indication that receives, and only transmits the Media Stream of obtaining right to speak user's terminal from this.

Wherein, this method further comprises: when the announcement information of current PoC session sends the mode that adopts point to arrive multiple spot, described SGW receives the announcement information from PoC service communication system or Exterior Communications System, obtain the cluster conversation attribute and the group user information of current PoC session group from described cluster conversation attribute database and the inquiry of PoC service communication system according to the group identification of current PoC session in the announcement information that receives, determine reception user in PoC service communication system and/or the Exterior Communications System according to this cluster conversation attribute and group user information, the notice that mails to the opposite end communication system is carried out protocol conversion, send announcement information to determined each again and receive user terminal;

When the announcement information of current PoC session sends the mode that adopts point-to-point, described SGW receives the announcement information from PoC service communication system or Exterior Communications System, announcement information is carried out protocol conversion, send announcement information again to Exterior Communications System or PoC service communication system.

When wherein, the system of described realization communication system intercommunication is the participation functional entity PF of current PoC session or relay entity Relay; Among the step B, the method that the signaling that described basis receives sends signaling comprises: described SGW sends signaling to each called user terminal according to the called user information in the signaling that receives.

Wherein, the system of described realization communication system intercommunication further comprises: the right to speak control gateway; This method further comprises: described right to speak control gateway receives the right to speak control signaling from the PoC service communication system, according to the indication of described right to speak control signaling, the transmission right to speak is indicated each user terminal to current PoC session in the described Exterior Communications System; Perhaps, receive right to speak indication, send each user terminal of right to speak control signaling current PoC session to the PoC service communication system according to this right to speak indication from Exterior Communications System.

Wherein, this method further comprises: described SGW receives the announcement information from PoC service communication system or Exterior Communications System, announcement information is carried out protocol conversion, send announcement information each to Exterior Communications System or the PoC service communication system again and receive user terminal.

Wherein, when described call subscriber terminal was the terminal of Exterior Communications System, among the step B, described SGW further sent the call subscriber terminal of signaling to the Exterior Communications System.

Wherein, described Exterior Communications System is gsm system or PSTN system; The described signaling that receives from gsm system or PSTN system of steps A is carried to subscriber signal UUS signaling by short message SMS signaling or unstructured supplementary service data USSD signaling or user; The signaling that step B is described to mail to gsm system or PSTN system is carried by Telephone User Part TUP or ISUP ISUP or carrying independent call control BICC signaling; The described signaling that mails to the PoC service communication system of step B is carried by session initiation protocol SIP signaling.

Wherein, described Exterior Communications System is gsm system or PSTN system, and the indication of described right to speak is carried by SMS or USSD or UUS signaling, and described right to speak control signaling is carried by the right to speak control Floor Control signaling of PoC service.

Wherein, described Exterior Communications System is gsm system or PSTN system, the announcement information of described SGW and gsm system or PSTN system interaction is carried by SMS or USSD or UUS signaling, and the mutual announcement information of described SGW and PoC service communication system is carried by the notice Notify message of SIP.

By such scheme as can be seen, key of the present invention is:

Therefore, the system and method for realization communication system intercommunication provided by the present invention, make the intercommunication of Exterior Communications Systems such as PoC service communication system and gsm system or PSTN system become possibility, and needn't change the inside of existing PoC service communication system, gsm system or PSTN system.Not only can make user terminal in the Exterior Communications System and the user terminal in the PoC service communication system set up PoC session, transmission of media data, and system of the present invention can also realize the CF function in the PoC service, and user terminal inserts PoC service and uses more PoC service function in the Exterior Communications System thereby make things convenient for.

Description of drawings

Fig. 1 is each part logical relation schematic diagram in the system of the present invention;

Fig. 2 is system of the present invention during as PF or Relay, and a preferred embodiment handling process schematic diagram is set up in session in the inventive method;

Fig. 3 is system of the present invention during as PF or Relay, and right to speak is controlled a preferred embodiment handling process schematic diagram in the inventive method;

Fig. 4 is system of the present invention during as CF, and a preferred embodiment handling process schematic diagram is set up in session in the inventive method;

When Fig. 5 seized right to speak and system of the present invention as CF for the PoC terminal, right to speak was controlled a preferred embodiment handling process schematic diagram in the inventive method;

When Fig. 6 seized right to speak and system of the present invention as CF for the GSM terminal, right to speak was controlled a preferred embodiment handling process schematic diagram in the inventive method;

Fig. 7 for system of the present invention as CF and when adopting point to the send mode of multiple spot, announcement information sends a preferred embodiment handling process schematic diagram in the inventive method.

Embodiment

The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.

Main purpose of the present invention is: the user in the Exterior Communications System can be communicated with the user of PoC service communication system, and use PoC service jointly.Main design philosophy of the present invention is: be connected a kind of system that realizes communication system intercommunication between PoC service communication system and Exterior Communications System, this system comprises at least: the session control gateway.This session control gateway comprises at least: SGW and media gateway, receive signaling and media data respectively from PoC service communication system or Exterior Communications System, send signaling to Exterior Communications System or PoC service communication system according to the signaling that receives, the media data that receives is carried out protocol conversion and is sent to Exterior Communications System or the PoC service communication system; And SGW also sends the medium control command and controls media gateway and set up the media delivery path.Described signaling comprises: with the mutual session control signaling of PoC service communication system, and with the mutual call signaling of Exterior Communications System; Described session control signaling comprises: signaling, the pre-established signaling of session, session modification signaling, session release signaling etc. are set up in session, corresponding, described call signaling comprises: call set up signaling, calling release signaling etc.

Here, SGW is connected the PoC server of PoC service communication system with media gateway, and with Exterior Communications System in be used for command transmitting and media data the operation exchange node link to each other.System of the present invention can make PoC service communication system and multiple Exterior Communications System realize intercommunication, relatively be typically with PSTN system or gsm system and realize intercommunication, wherein, the service interaction node that directly links to each other with system of the present invention in the PSTN system is exactly the PSTN gateway exchange, and the service interaction node that directly links to each other with system of the present invention in the gsm system is exactly GMSC (gateway mobile switching center) (GMSC).This paper will mainly describe the PoC service communication system and the process of more typical PSTN system or gsm system intercommunication with regard to using system of the present invention, and still, Exterior Communications System of the present invention is not limited to gsm system and PSTN system.

Consider the half-duplex operation mechanism that is based on right to speak control that the PoC service communication system adopts, the above-mentioned session control gateway that comprises SGW and media gateway can make the Exterior Communications System terminal set up PoC session, participate in PoC service, therefore but this terminal can't be seized right to speak, can only answer voice and can't make a speech.Like this, be to realize the excellent communications effect, described session control gateway can further comprise: the right to speak control gateway can discern the terminal of Exterior Communications System to control signaling from the right to speak of PoC service communication system and also can be seized right to speak.This right to speak control gateway is used for sending right to speak according to the right to speak control signaling from the PoC server indicates to Exterior Communications System, sends right to speak control signaling to the PoC server according to the right to speak indication from Exterior Communications System.

The system of above-mentioned realization communication system intercommunication is applicable to following communication system intercommunication mode: the terminal use of Exterior Communications System registers in the PoC service communication system.According to the PoC service standard, in PoC session, must have a CF to come that all signalings and medium are carried out mechanism and handle, and each registered user's terminal all belongs to a PF, be responsible for forwarding, filtering information between CF and terminal or the like.And for a terminal, the PF that it belonged to may be same or different entities with current sessions CF.In the PoC service communication system, CF and PF are realized by the PoC server, realize that the PoC server of CF function is called as control (Controlling) PoC server, realize that the PoC server of PF function is called as participation (Participating) PoC server.Therefore, when adopting the mode of this kind system intercommunication, in PoC session, the participation functional entity (PF) and the controlled function entity (CF) of Exterior Communications System terminal are arranged in the PoC service communication system, and this moment, the system of this realization communication system intercommunication handled the data that receive as a kind of relay entity (Relay).

Except above-mentioned communication system intercommunication mode, also have a kind of intercommunication mode to be exactly: the Exterior Communications System terminal use is not the registered user of PoC service communication system.At this moment, the PF or the Relay of Exterior Communications System terminal may serve as in system of the present invention in some PoC cluster conversation.But the PoC cluster conversation is divided into several classes, and wherein the CF of interim cluster conversation is the PF of conversation starting terminal ownership, and fixedly the CF of group or chat (Chat) model group group session is the PF that management and group person's terminal is belonged to.So, system of the present invention realizes the CF function possibly in some session, in processes such as session foundation, media delivery, handle in conjunction with the group user information of PoC service, cluster conversation attribute etc., system then of the present invention should further comprise: the cluster conversation attribute database that is used to preserve the cluster conversation attribute, described SGW extracts the cluster conversation attribute from the cluster conversation attribute database when setting up session, and extract group user information from the PoC service communication system.Here, the difference of described PF and Relay is: Relay only is responsible for all signalings, medium are carried out necessary protocol conversion, do not relate to the concrete control to PoC service, and PF will carry out the conversation control function of PoC norm-setting.

Here, described group user information comprising from the shared XML document management server (Shared XDMS) in the PoC service communication system: terminal address of each group identification and each group member user etc. in the current PoC service communication system; Attribute information when each group of described cluster conversation attribute representation sets up session, comprise: current cluster conversation inserts maximum user terminal numbers, each Member Users institute role, the media capability of each user terminal, time limit of current cluster conversation or the like, be equivalent to the cluster conversation attribute information that PoC XML document management server (PoC XDMS) is preserved in the PoC service communication system, these cluster conversation attributes need be kept in the cluster conversation attribute database of the present invention in advance.

In addition, when system of the present invention during as CF, also to implement control to the right to speak of PoC session, therefore, right to speak control gateway wherein also will determine which terminal use obtains right to speak according to right to speak control signaling of coming self terminal and/or right to speak indication, and send right to speak and indicate to media gateway, media gateway only transmission obtains the Media Stream of the terminal of right to speak.

Fig. 1 is each part logical relation schematic diagram in the system of the present invention.Among Fig. 1, system of the present invention realizes is intercommunication between PoC service communication system and the gsm system.As shown in Figure 1, solid line partly is: when the GSM terminal use is PoC service communication system registered user, the present invention realizes that the system of communication system intercommunication forms structure, the system of this realization communication system intercommunication comprises the session control gateway, and it comprises: SGW, media gateway and right to speak control gateway.The PoC service communication system comprises: Shared XDMS, PoC server and PoC terminal, and wherein, Shared XDMS all links to each other with the PoC server with the PoC terminal; Described PoC server also is sent to SGW, media gateway and right to speak control gateway respectively with PoC terminal interaction right to speak control signaling, session control signaling and Media Stream.Gsm system comprises: GMSC and GSM terminal; Described GMSC will send to the GSM terminal from call signaling, Media Stream and the right to speak indication of signaling gateway, media gateway, right to speak control gateway respectively.Because the composition structure of PoC service communication system and gsm system inside there is no change, therefore, this paper does not describe for PoC service communication system and inner each part of gsm system.

Wherein, SGW receives from the session control signaling of PoC server or from the call signaling of GMSC, structure call signaling or session control signaling are sent to GMSC or PoC server respectively, send the medium control command to media gateway.Media gateway is set up the media distribution media transmission resources, is set up the media delivery path according to the medium control command that receives, and the Media Stream from PoC server or GMSC is carried out protocol conversion and is sent to MSC or the PoC server.The right to speak control gateway sends right to speak according to the right to speak control signaling from the PoC server and indicates to GMSC, sends right to speak control signaling to the PoC server according to the right to speak indication from GMSC.

When the non-PoC service communication system of GSM terminal use registered user, as shown in Figure 1, the system of communication system intercommunication of the present invention should add the cluster conversation attribute database shown in the dotted line on the basis of part shown in the above-mentioned solid line, and increases several dotted lines connections shown in Figure 1.Wherein, when system of the present invention during as the CF of Exterior Communications System terminal, SGW extracts the cluster conversation attribute after receiving session control signaling or call signaling from the cluster conversation attribute database, and, construct call signaling and/or session control signaling then and export GMSC to and/or the PoC server from Shared XDMS extraction group user information.The right to speak control gateway receives from the right to speak indication of GMSC and/or PoC server and/or right to speak control signaling, be responsible for authorizing and discharging right to speak, and further send right to speak according to the situation of authorizing or discharge right to speak and indicate to media gateway, thereby media gateway can determine to transmit the Media Stream of which terminal.

Above-mentioned shown in Figure 1 only be logic connecting relation between cluster conversation attribute database, SGW, media gateway, the right to speak control gateway, its physics realization mode will have multiple: one, these four parts are independent respectively is provided with; Two, wherein arbitrarily two or three partly integrated be same physical entity; Three, this is integrated in the same physical entity.But specifically adopt which kind of implementation, the present invention does not limit.

Only be that gsm system is an example below, the control of the PoC session in the inventive method, floor control process be illustrated respectively, and further elaborate the realization principle of system of the present invention in conjunction with Fig. 2 to Fig. 6 with the Exterior Communications System.

The control of described PoC session comprises: set up session, session pre-established, revise session, discharge flow processs such as session, setting up flow process with PoC session among Fig. 2 is that control is illustrated example to the PoC session in the inventive method.Because, the PoC terminal is by PoC server and system interaction session control signaling of the present invention and Media Stream, the GSM terminal is then by GMSC and system interaction call signaling of the present invention and Media Stream, and the processing of PoC server and GMSC is same as the prior art, be simplified illustration, among Fig. 2 and not shown PoC server and GMSC, also the processing of PoC server and GMSC is omitted in below describing.

Fig. 2 is system of the present invention during as PF or Relay, and a preferred embodiment handling process schematic diagram is set up in session in the inventive method.Among Fig. 2, step 201 is set up process to the session of step 205 when the caller of PoC terminal, and process is set up in step 206 to the session of step 212 during for the caller of GSM terminal.

When the caller of PoC terminal, concrete treatment step comprises:

Step 201: caller PoC terminal sends session by the PoC server and sets up the SGW of signaling to the session control gateway, and this session is set up and carried called GSM terminal iidentification in the signaling.

Here, the PoC session of PoC service communication system is set up usually based on Session Initiation Protocol, so the session of present embodiment is set up signaling and can be carried by invitation (INVITE) message of Session Initiation Protocol.

Step 202: the session that SGW receives from step 201 is set up to resolve the signaling and is obtained called GSM terminal iidentification.

Usually, the terminal iidentification of PoC service communication system is a Domain Name Form registering sites, and the terminal iidentification of gsm system is a phone number format.If called GSM terminal use is the PoC service registered user, then caller PoC terminal is when called GSM terminal initiation session is set up process, to set up the sign of carrying the Domain Name Form registering sites of this called GSM terminal in the PoC service communication system in the signaling in session, in such cases, SGW will be by the corresponding relation of terminal iidentification between pre-configured PoC service communication system and the PSTN system in this step, and the called GSM terminal iidentification of setting up the Domain Name Form registering sites in the signaling according to session obtains the called GSM terminal iidentification of phone number format.If called GSM terminal use is non-PoC service registered user, then caller PoC terminal is when called GSM terminal initiation session is set up process, to set up the sign of carrying the phone number format of this called GSM terminal in gsm system in the signaling in session, in such cases, SGW can directly be set up the called GSM terminal iidentification that obtains phone number format the signaling from session in this step.

Step 203: SGW is included in the called GSM terminal iidentification that step 202 obtains in the call set up signaling of gsm system, and sending this call set up signaling to GMSC, GMSC routes to called GSM terminal according to the called GSM sign in the call set up signaling with this call set up signaling.SGW also sends the media gateway of medium control command to the session control gateway when sending call set up signaling, the notice media gateway is that the current sessions allocation medium is handled resource.

Wherein, gsm system adopts the TUP/ISUP/BICC signaling to set up calling, so the call set up signaling of the described GSM of the mailing to terminal of present embodiment can be carried by initial address message (IAM) message of TUP/ISUP/BICC.Mutual medium control command can be based on agreement H.248 between SGW and the media gateway, and the medium control command in this step can be carried by establishment (Create) order H.248.

Step 204: called GSM terminal begins ring after receiving described IAM message, and the full message in return address (ACM) message is given SGW, SGW is SIP signaling 183 message of PoC service communication system with the ACM message conversion that receives, and this 183 message returned to described caller PoC terminal by the PoC server, indicate the circuit of the terminal called GSM terminal of this PoC to connect, and the beginning ring.The unlatching (Open) H.248 of SGW transmission is simultaneously ordered to media gateway, and the notice media gateway activates the media processing resources that step 203 is distributed, and prepares to handle the Media Stream of current sessions.

Step 205: behind the called PSTN terminal off-hook, return address response message (ANM) message is given SGW, SGW is converted to SIP signaling 200 OK message with the ANM that receives, and this 200 OK message sent to caller PoC terminal by the PoC server, thereby the terminal called GSM terminal of indication caller PoC is off-hook, and current PoC session is set up successfully.

When the caller of GSM terminal, concrete treatment step comprises:

Step 206: caller GSM terminal sends session by GMSC and sets up message to SGW, the content of text that message is set up in this session comprises the cluster conversation sign, and the content that SGW is set up message by the parsing session is learnt the group identification that need set up PoC session and learn current sessions.

Here, described session is set up message and can be carried by the signaling that gsm system multiple is used to send content of text, comprising: SMS, USSD, UUS etc.The content of text that these signalings are carried comprises the group identification of Domain Name Form registering sites.Such as: GSM terminal can send a content for the SMS of " INVITEgroup1@huawei.com " to SGW, group1@huawei.com is exactly a kind of group identification, thereby SGW will be set up PoC session as can be known according to INVITE, will set up the PoC session of which group as can be known according to group1@huawei.com.Therefore, for the present invention, this session is set up message and be can be described as a kind of call signaling.

Step 207: SGW is included in the described group identification of step 206 in the INVITE and is sent to called PoC terminal by the PoC server, and to media gateway transmission Create order H.248, the notice media gateway is that the current sessions allocation medium is handled resource.

Here, identical about the principle of SGW structure INVITE with the principle of existing PoC server constructs INVITE, be not described further at this.

Step 208: after called PoC terminal successfully receives described INVITE, return 183 message by the PoC server and give SGW, carried terminal media capability negotiation result in this message, thus inform that the called PoC terminal of SGW set up session connection.Then, SGW sends Open and orders to media gateway, and the notice media gateway activates the media processing resources that step 207 is distributed, and prepares the Media Stream of transmission current sessions.

Because, system of the present invention is as the PF or the Relay of current sessions, therefore, the CF that serves as current sessions by the PoC server, this PoC server receives the INVITE from SGW, and according to the group identification in this INVITE, inquires about the Shared XDMS that self connects and obtain this group user information, and can from PoC XDMS, obtain the cluster conversation attribute, thereby can send INVITE to each called PoC terminal.The processing of the described PoC server of this section all has a detailed description in the PoC service standard, so this paper no longer describes its realization principle in detail.

Step 209: behind the called PoC terminal off-hook, return 200 OK message by the PoC server and give SGW, the session of notice signaling gateway self is set up and is finished.

Step 210: SGW sends IAM message to caller GSM terminal, sets up with caller GSM terminal and calls out.

Step 211: caller GSM terminal is returned ACM message, the on of notice signaling gateway caller GSM terminated line, beginning ring.

Step 212: return ANM behind the caller GSM terminal off-hook and give SGW, thereby the foundation of whole PoC session is finished.

Though during the caller of GSM terminal, usually adopt the IAM signaling to make a call, but the IAM signaling can only be carried called subscriber's telephone number, and will carry the group identification of Domain Name Form registering sites when initiating PoC session at least, so IAM signaling and be not suitable for the initiation PoC session.So in the step 206, what caller GSM terminal sent is the signalings such as SMS that can transmit content of text, but caller GSM terminal is also set up and is called out, so needs in the step 210 to make it set up calling to caller GSM terminal transmission IAM signaling, thereby sets up PoC session.

To carry out PoC session pre-established or when revising PoC session or discharging PoC session etc. when using the inventive method, processing procedure and Fig. 2 are described basic identical, be the concrete message difference that described session control signaling and call signaling carries, therefore, this paper describes no longer one by one.

Fig. 3 is system of the present invention during as PF or Relay, and right to speak is controlled a preferred embodiment handling process schematic diagram in the inventive method.System of the present invention only is responsible for transmitting right to speak control signaling or right to speak indication during as PF or Relay, is realized the centralized control of right to speak by the PoC server.Wherein, described right to speak control signaling comprises: the request of request floor power, the request of release right to speak, and right to speak permission, right to speak take notice, the idle notice of right to speak or the like; Corresponding, described right to speak indication comprises: the request of request floor power, the request of release right to speak, right to speak permission, right to speak take indication, the idle indication of right to speak or the like.

Because right to speak control flow from the PoC terminal to the PoC server adopts existing realization flow, therefore, be to simplify to describe, among Fig. 3 and not shown PoC terminal, and omitted the GMSC that only is used to transmit the right to speak indication equally.Among Fig. 3, the floor control process of step 301 when step 305 is seized right to speak for the PoC terminal, step 306 floor control process when step 314 is seized right to speak for the GSM terminal.

When the PoC terminal was seized right to speak, concrete treatment step comprised:

Step 301:PoC terminal sends the request of request floor power to the PoC server, returns right to speak as the PoC server of CF and permits the terminal to PoC, and this PoC terminal obtains right to speak, and simultaneously, the PoC server also sends right to speak to the right to speak control gateway and takies notice.

Here, right to speak such as described request floor power request is controlled signaling and can be carried by the various signalings in the PoC service communication system right to speak control protocol.

Step 302: the right to speak control gateway sends right to speak by GMSC and takies and indicate each GSM terminal that participates in current PoC session to the gsm system.

Here, described right to speak takies the indication of right to speak such as indication and can be carried by signalings such as SMS, the USSD of gsm system or UUS.

Step 303: the described PoC terminal that obtains right to speak sends Media Stream to the PoC server as CF, this PoC server has right to speak and its Media Stream is sent to media gateway according to this PoC terminal, media gateway is the circuit type Media Stream with the RTP media stream transition that receives, and is sent to described each GSM terminal of step 302 by GMSC.At this moment, if the GSM terminal sends Media Stream to media gateway, media gateway can become the media stream transition that receives the RTP Media Stream and be sent to the PoC server, does not obtain its Media Stream of right to speak refusal transmission thereby adjudicate this GSM terminal as the PoC server of CF.

Step 304: the described PoC terminal that obtains right to speak sends and discharges the right to speak request to the PoC server as CF, and this PoC server transmission right to speak free time is notified to the right to speak control gateway.

Step 305: the right to speak control gateway sends the idle indication of right to speak to each GSM terminal that participates in current PoC session.

When the GSM terminal was seized right to speak, concrete treatment step comprised:

Step 306:GSM terminal sends request floor power by GMSC and asks to the right to speak control gateway, comprises this GSM terminal iidentification in this request.

Step 307: the right to speak control gateway sends the request of request floor power to the PoC server as CF, and this request comprises the described GSM terminal iidentification of step 306.

Step 308: described PoC server as CF sends right to speak and permits to the right to speak control gateway, comprises the described GSM terminal iidentification of step 306 in this right to speak permission.

Step 309: the right to speak control gateway sends right to speak by GMSC and permits that this GSM terminal obtains right to speak to the described GSM terminal of step 306 according to the GSM terminal iidentification in the right to speak permission.

Step 310: the described GSM terminal that obtains right to speak sends Media Stream to media gateway by GMSC, media gateway becomes the RTP Media Stream to be sent to PoC server as CF the circuit type media stream transition that receives, this PoC server is adjudicated this GSM terminal and is obtained right to speak, determines this Media Stream of transmission.

Step 311: the described GSM terminal that obtains right to speak sends and discharges the right to speak request to the right to speak control gateway, comprises this GSM terminal iidentification in this request.

Step 312: the right to speak control gateway sends and discharges the right to speak request to described PoC server as CF, comprises the described GSM terminal iidentification of step 311 in this request, and the PoC server discharges the right to speak of this GSM terminal according to this GSM terminal iidentification.

Step 313: the described PoC server transmission right to speak free time as CF is notified to the right to speak control gateway.

Step 314: the right to speak control gateway sends the idle indication of right to speak to the GSM terminal of described release right to speak and other GSM terminal that participates in current PoC session.

At this moment, if this GSM terminal sends Media Stream to media gateway, media gateway can become the media stream transition that receives the RTP Media Stream and be sent to the PoC server, thereby has discharged its Media Stream of refusal transmission as the right to speak that the PoC server of CF is adjudicated this GSM terminal.

Fig. 4 is system of the present invention during as CF, and a preferred embodiment handling process schematic diagram is set up in session in the inventive method.In like manner described with Fig. 2, be simplified illustration, among Fig. 2 and not shown PoC server and GMSC, also the processing of PoC server and GMSC is omitted in below describing.As shown in Figure 4, when the caller of GSM terminal, the concrete processing comprises:

Step 401: caller GSM terminal sends session and sets up message to SGW, the content of text that message is set up in this session comprises the cluster conversation sign, and SGW is set up the content of message and learnt and need set up PoC session and group identification that can current sessions by resolving session.Here, described session set up message can be by signaling bears such as SMS, USSD, UUS.

Step 402: SGW sends inquiry cluster conversation attribute request according to the described group identification of step 401 to the cluster conversation attribute database, and sends inquiry group user information request to Shared XDMS simultaneously.Cluster conversation attribute database and Shared XDMS return the cluster conversation attribute and the group user information of this group identification correspondence respectively to SGW.

Here, the cluster conversation attribute database has been preserved the session attribute information of each group in advance, and the user also can come the cluster conversation attribute information of this database of real-time update by the Web page that Internet logins this cluster conversation attribute database

Step 403: the cluster conversation attribute that SGW receives according to step 402 and the INVITE of each called PoC terminal of group user information structuring also are sent to each called PoC terminal by the PoC server.Simultaneously, SGW sends IAM message to caller GSM terminal, if also there is other GSM terminal in the current sessions except that caller GSM terminal, then also will sends IAM message to these other GSM terminals, thereby make a call to each GSM terminal of current sessions; SGW is also ordered to the Create that H.248 media gateway sends, and the notice media gateway is that the current sessions allocation medium is handled resource.

Step 404: after each called PoC terminal successfully receives described INVITE, return 183 message by the PoC server and give SGW, carried terminal media capability negotiation result in this message, thus inform that the called PoC terminal of SGW set up session connection.SGW sends Open and orders to media gateway, and the notice media gateway activates the media processing resources that step 403 is distributed, and prepares the Media Stream of transmission current sessions.

Step 405: behind each called PoC terminal off-hook, return 200 OK message by the PoC server and give SGW, show that the session foundation of self is finished.

In execution in step 404 and step 405, comprise each GSM terminal also the executed in parallel following steps 404 ' and the step 405 of the current sessions of caller GSM terminal ':

Step 404 ': caller GSM terminal is returned ACM message and is given SGW, notifies self circuit on, the beginning ring.Other GSM terminal in the current sessions except that caller GSM terminal is also returned ACM message to SGW respectively.

Step 405 ': return ANM behind the caller GSM terminal off-hook and give SGW, notify the session foundation of self to finish.In addition, if also there is other GSM terminal in the current sessions except that caller GSM terminal, then these other GSM terminals are also returned ACM message and ANM to SGW respectively.

When the caller of PoC terminal, the session of the inventive method is set up process and above-mentioned steps 401 to step 405 ' processing basic identical, different is:

Described step 401 becomes: caller PoC terminal sends INVITE to SGW, comprises the current group identification of setting up PoC session in this INVITE.

In the described step 403, SGW sends IAM message to all GSM terminals of current sessions, thereby makes a call to each GSM terminal of current sessions.If also there is other PoC terminal in the current sessions except that caller PoC terminal, then SGW also will send INVITE to these other PoC terminals.

When Fig. 5 seized right to speak and system of the present invention as CF for the PoC terminal, right to speak was controlled a preferred embodiment handling process schematic diagram in the inventive method.Among Fig. 5, system of the present invention carries out centralized control as CF to right to speak, be responsible for floor grant, send that right to speak takies or idle notice etc., the PoC server is as just the entity of transmitting right to speak control signaling, GMSC is also as just the entity of transmitting the right to speak indication in addition, describe for simplifying, omitted PoC server and GMSC among Fig. 5.As shown in Figure 5, the concrete processing comprises:

Step 501:PoC terminal sends request floor by the PoC server and weighs the right to speak control gateway of asking to the session control gateway, and this request comprises this PoC terminal iidentification.

Here, the right to speak control gateway may receive the request floor power request from PoC server and/or GMSC simultaneously, the right to speak control gateway will be distributed right to speak by rules such as terminal use's priority, and present embodiment is set and authorized this step described PoC terminal right to speak.

Step 502: the right to speak control gateway sends right to speak by the PoC server and permits to the described PoC terminal of step 501, and transmission PoC terminal takies the indication of right to speak to media gateway, comprise the sign of this PoC terminal in this right to speak indication, media gateway is preserved this sign that obtains the PoC terminal of right to speak.

Step 503: the right to speak control gateway takies indication to each GSM terminal transmission right to speak of current sessions.

Here, if also exist to remove other PoC terminal the PoC terminal of request right to speak in the current sessions, then the right to speak control gateway also will take notice to each other PoC terminal transmission right to speak.

Step 504: the described PoC terminal that obtains right to speak sends Media Stream to media gateway by the PoC server, media gateway is according to the terminal iidentification of preserving in advance of obtaining right to speak, judge that current PoC terminal has obtained right to speak, to become the circuit type Media Stream of gsm system from the media stream transition of the RTP form of PoC terminal, be sent to each GSM terminal of current sessions by GMSC; If also there is other PoC terminal except that the PoC terminal that obtains right to speak in the current sessions, then the right to speak control gateway also will directly send in the current sessions other PoC terminal except that this obtains the PoC terminal of right to speak with the RTP Media Stream by the PoC server.

At this moment, if other PoC terminal in GSM terminal or the current sessions except that the PoC terminal that obtains right to speak sends Media Stream to media gateway, media gateway will judge that this GSM terminal or this other PoC terminal do not obtain right to speak, thus the refusal media stream.

Step 505: the described PoC terminal that obtains right to speak sends by the PoC server and discharges the right to speak request to the right to speak control gateway, and this request comprises this PoC terminal iidentification.

Step 506: the right to speak of right to speak control gateway release steps 505 described PoC terminals, send the indication that the PoC terminal discharges right to speak to media gateway, this indication comprises the described PoC terminal iidentification of step 505, and media gateway discharges this PoC terminal iidentification of being preserved.

Step 507: the right to speak control gateway sends the idle indication of right to speak by GMSC to each GSM terminal of current sessions, and sends the idle notice of right to speak by the PoC server to the PoC terminal of the described release right to speak of step 505; If also there is other PoC terminal except that the PoC terminal that obtains right to speak in the current sessions, then the right to speak control gateway also will send the idle notice of right to speak by PoC server other PoC terminal except that the PoC terminal of described release right to speak in current sessions.

Step 508: when the PoC terminal of described release right to speak sent Media Stream once more to media gateway, media gateway judged that this PoC terminal does not obtain right to speak, and the Media Stream of this PoC terminal of refusal transmission.

When Fig. 6 seized right to speak and system of the present invention as CF for the GSM terminal, right to speak was controlled a preferred embodiment handling process schematic diagram in the inventive method.In like manner described with Fig. 5, describe for simplifying, omitted PoC server and GMSC among Fig. 6.As shown in Figure 6, the concrete processing comprises:

Step 601:GSM terminal sends request floor power by GMSC and asks to the right to speak control gateway, and the request of this application right to speak comprises this GSM terminal iidentification.

Here, the right to speak control gateway may receive the request floor power request from PoC server and/or GMSC simultaneously, the right to speak control gateway will be distributed right to speak by rules such as terminal use's priority, and present embodiment is set and authorized this step described GSM terminal right to speak.

Step 602: the right to speak control gateway sends right to speak and permits that this GSM terminal obtains right to speak to the described GSM terminal of step 601; The right to speak control gateway also sends indication that the GSM terminal takies right to speak to media gateway, and this indication comprises this GSM terminal iidentification, and media gateway is preserved this according to this indication and obtained the GSM terminal iidentification of right to speak; Simultaneously, if have other PoC terminal and/or GSM terminal except that the described GSM terminal that obtains right to speak in the current sessions, then the right to speak control gateway also sends right to speak by the PoC server to described other PoC terminal and takies notice, and/or takies indication by GMSC other GSM terminal transmission right to speak outside described other GSM terminal.

Step 603: the described GSM terminal that obtains right to speak sends Media Stream to media gateway by GMSC, the GSM terminal iidentification that this media gateway is preserved according to step 602 judges that this GSM terminal obtains right to speak, become the RTP Media Stream to be sent to each PoC terminal of current sessions the circuit type media stream transition of this GSM terminal, and/or this circuit type Media Stream directly is sent in the current sessions other GSM terminal except that this obtains the GSM terminal of right to speak by GMSC by the PoC server.

At this moment, if other GSM terminal in PoC terminal or the current sessions except that the described GSM terminal that obtains right to speak sends Media Stream to media gateway, media gateway will adjudicate this PoC terminal or other GSM terminal does not obtain right to speak, thus refusal this PoC terminal of transmission or other GSM terminal media stream.

Step 604: the described GSM terminal that obtains right to speak sends by GMSC and discharges the right to speak request to the right to speak control gateway, and the request of this application right to speak comprises this GSM terminal iidentification.

Step 605: the right to speak of right to speak control gateway release steps 604 described GSM terminals, and send the indication that the GSM terminal discharges right to speak to media gateway, comprise the described GSM terminal iidentification of step 604 in this indication, the described GSM terminal iidentification of obtaining right to speak that media gateway is preserved according to this indication release steps 602; The right to speak control gateway also sends the idle indication of right to speak by GMSC to the GSM terminal that described request discharges right to speak.

Simultaneously, if have other PoC terminal and/or GSM terminal except that the described GSM terminal that obtains right to speak in the current sessions, then the right to speak control gateway also sends the idle notice of right to speak by the PoC server to described other PoC terminal, and/or sends the idle indication of right to speak by GMSC other GSM terminal outside described other GSM terminal.

Step 606: the GSM terminal of described release right to speak sends Media Stream to media gateway, and media gateway judges that this GSM terminal does not obtain right to speak, its Media Stream of refusal transmission.

Except above-mentioned set up session, session pre-established, discharge functions such as session, right to speak control, system of the present invention can also realize announcement information (Notify) sending function of PoC session.Briefly, this announcement information just is equivalent to the SMS in the gsm system.Wherein, PoC service provides two kinds of announcement information send modes: one, point-to-point, promptly announcement information between terminal, transmit and and without the processing of CF; Two, put multiple spot, promptly announcement information at first is sent to CF, is concentrated by CF and distributes.

When the announcement information that adopts first kind of mode to carry out point-to-point sends, no matter system of the present invention serves as in current sessions is CF, PF, or Relay, it just plays the effect of forwarding, SGW receives the announcement information from PoC terminal or GSM terminal, and this announcement information is carried out being sent to each recipient GSM terminal or each recipient PoC terminal after the protocol format conversion.With the PoC terminal send announcement information be example in other words: SGW receives the announcement information of Session Initiation Protocol from the PoC terminal, according to the recipient GSM terminal iidentification in this announcement information this announcement information is converted to the announcement information of gsm system, as: SMS, UUSD, UUS etc.; Announcement information with this gsm system is sent to recipient GSM terminal by GMSC then.Wherein, if the recipient GSM terminal iidentification in the described announcement information is a Domain Name Form registering sites, SGW also will be converted to the GSM terminal iidentification of phone number format according to pre-configured GSM terminal iidentification with Domain Name Form registering sites, thereby GMSC could successfully route to announcement information recipient GSM terminal.

When the announcement information that adopts the second way to put multiple spot sends, if that system of the present invention serves as in current sessions is PF or Relay, system then of the present invention mainly is responsible for transmitting announcement information, and concrete processing method is described identical with the last period, no longer describes here; If that system of the present invention serves as in current sessions is CF, then the processing procedure relative complex is elaborated to this processing below in conjunction with Fig. 7.

Fig. 7 for system of the present invention as CF and when adopting point to the send mode of multiple spot, announcement information sends a preferred embodiment handling process schematic diagram in the inventive method.Among Fig. 7, system of the present invention concentrates announcement information as CF and distributes, and the PoC server is as just the entity of transmitting announcement information, and GMSC describes for simplifying also as just the entity of transmitting announcement information in addition, has omitted PoC server and GMSC among Fig. 7.As shown in Figure 7, the concrete processing comprises:

Step 701:PoC terminal sends the SGW of announcement information to the session control gateway by the PoC server, comprises the group identification of current sessions in this announcement information.

Step 702: SGW sends inquiry cluster conversation attribute request to the cluster conversation attribute database according to the described group identification of step 701, sends inquiry group user information request to Shared XDMS.

Step 703: cluster conversation attribute database and Shared XDMS return the cluster conversation attribute and the group user information of current sessions group respectively and give SGW.

Step 704: SGW determines according to the cluster conversation attribute and the group user information of current sessions which user terminal this announcement information should issue, and the announcement information that will convert gsm system then from the announcement information of PoC terminal to is distributed to each GSM terminal of current sessions by GMSC; If there is other PoC terminal except that the PoC terminal of described transmission announcement information in the current sessions, then SGW also will directly be distributed to described other PoC terminal with the announcement information of described PoC terminal by the PoC server.

When sending announcement information by the GSM terminal, handling process is identical with foregoing principle, is being the described inverse process of Fig. 7 just aspect the sending direction of announcement information and the conversion.

When application the present invention realized PoC service communication system and other Exterior Communications System intercommunication, the composition structure of system of the present invention was same as shown in Figure 1, and just the operation exchange node in the Exterior Communications System and the concrete entity of terminal representative change to some extent.Such as: when Exterior Communications System is the PSTN system, among Fig. 1, becomes the PSTN gateway exchange as the GMSC of operation exchange node, and become the PSTN terminal as Exterior Communications System terminal GSM terminal.At this moment, the processing of the inventive method also with Fig. 2 to shown in Figure 7 basic identical, the concrete message that different is in the Exterior Communications System concrete entity and information interaction are carried changes to some extent, but the handling process of entire method there is no change.So specific implementation process of the present invention was described when this paper no longer was other systems such as PSTN to Exterior Communications System, but all in protection scope of the present invention.

In sum, using system and method for the present invention can make the Exterior Communications System user terminal realize communicating by letter of signaling and media data with PoC service Communications System User terminal, cooperate and finish flow processs such as session control, right to speak control, announcement information transmission, and needn't be to existing PoC service communication system, and Exterior Communications System such as gsm system, PSTN system changes, and is significant for the wide spread of PoC service.

The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all be included in protection scope of the present invention.

Claims

1, a kind of system that realizes communication system intercommunication is used to realize the intercommunication of cellular system PTT PoC service communication system and Exterior Communications System, it is characterized in that the system of this realization communication system intercommunication comprises:

2, system according to claim 1 is characterized in that, the system of described realization communication system intercommunication further comprises:

The right to speak control gateway, reception sends the right to speak indication to described Exterior Communications System from the right to speak control signaling of PoC service communication system, and the right to speak indication that receives from described Exterior Communications System sends right to speak control signaling to the PoC service communication system.

3, system according to claim 2 is characterized in that, when the system of described realization communication system intercommunication was the controlled function entity CF of current PoC session, described right to speak control gateway further linked to each other with described media gateway;

Described right to speak control gateway further receives from the right to speak control signaling of PoC service communication system with from the right to speak of described Exterior Communications System and indicates, authorize and discharge right to speak, send the right to speak indication to this media gateway according to the situation of authorizing or discharge right to speak, and send right to speak control signaling respectively and right to speak is indicated to PoC service communication system and described Exterior Communications System.

4, system according to claim 1 is characterized in that, this system further comprises: the cluster conversation attribute database, preserve the cluster conversation attribute of each group in the PoC service communication system;

When the system of described realization communication system intercommunication is the CF of current PoC session, described SGW further links to each other with described cluster conversation attribute database, sends signaling and medium control command according to the cluster conversation attribute that extracts from this cluster conversation attribute database and from the group user information that the PoC service communication system receives.

5, system according to claim 1 is characterized in that, described Exterior Communications System is global mobile communication gsm system or public switched telephone network (PSTN) PSTN system.

6, a kind of method that realizes communication system intercommunication is characterized in that, this method adopts the system of the realization communication system intercommunication that comprises described SGW and media gateway, and this method comprises:

7, method according to claim 6 is characterized in that, the system of described realization communication system intercommunication further comprises: the cluster conversation attribute database; When the system of this realization communication system intercommunication is the CF of current PoC session;

Among the step B, the method that the signaling that described basis receives sends signaling comprises:

Described SGW obtains the cluster conversation attribute and the group user information of current PoC session from described cluster conversation attribute database and the inquiry of PoC service communication system according to the group identification of current PoC session in the signaling that receives; Determine the called subscriber according to this cluster conversation attribute and group user information, the concurrent order of delivering letters is to determined each called user terminal;

When determined called user terminal had both comprised terminal in the PoC service communication system, when also comprising the terminal in the described Exterior Communications System, described SGW sends signaling each called user terminal to determined PoC service communication system and the described Exterior Communications System.

8, method according to claim 7 is characterized in that, the system of described realization communication system intercommunication further comprises: the right to speak control gateway; This method further comprises:

Described right to speak control gateway receives from the right to speak control signaling of PoC service communication system and/or from the right to speak of Exterior Communications System and indicates, the right to speak of determining to obtain the user of right to speak or discharging the user, send the right to speak indication to media gateway, each user terminal of current PoC session sends right to speak control signaling in described PoC service communication system, and/or each user terminal of current PoC session sends the right to speak indication in described Exterior Communications System;

Among the step C, media gateway determines to obtain the user of right to speak according to the right to speak indication that receives, and only transmits the Media Stream of obtaining right to speak user's terminal from this.

9, method according to claim 7 is characterized in that, this method further comprises:

When the announcement information of current PoC session sends the mode that adopts point to arrive multiple spot, described SGW receives the announcement information from PoC service communication system or Exterior Communications System, obtain the cluster conversation attribute and the group user information of current PoC session group from described cluster conversation attribute database and the inquiry of PoC service communication system according to the group identification of current PoC session in the announcement information that receives, determine reception user in PoC service communication system and/or the Exterior Communications System according to this cluster conversation attribute and group user information, the notice that mails to the opposite end communication system is carried out protocol conversion, send announcement information to determined each again and receive user terminal;

When the announcement information of current PoC session sends the mode that adopts point-to-point, described SGW receives the announcement information from PoC service communication system or Exterior Communications System, announcement information is carried out protocol conversion, send announcement information each to Exterior Communications System or the PoC service communication system again and receive user terminal.

10, method according to claim 6 is characterized in that, when the system of described realization communication system intercommunication is the participation functional entity PF of current PoC session or relay entity Relay;

Described SGW sends signaling to each called user terminal according to the called user information in the signaling that receives.

11, method according to claim 10 is characterized in that, the system of described realization communication system intercommunication further comprises: the right to speak control gateway; This method further comprises:

Described right to speak control gateway receives the right to speak control signaling from the PoC service communication system, and according to the indication of described right to speak control signaling, the transmission right to speak is indicated each user terminal to current PoC session in the described Exterior Communications System; Perhaps, receive right to speak indication, send each user terminal of right to speak control signaling current PoC session to the PoC service communication system according to this right to speak indication from Exterior Communications System.

12, method according to claim 10 is characterized in that, this method further comprises:

Described SGW receives the announcement information from PoC service communication system or Exterior Communications System, and announcement information is carried out protocol conversion, sends announcement information each to Exterior Communications System or the PoC service communication system again and receives user terminal.

According to claim 7 or 10 described methods, it is characterized in that 13, when described call subscriber terminal was the terminal of Exterior Communications System, among the step B, described SGW further sent the call subscriber terminal of signaling to the Exterior Communications System.

According to claim 7 or 10 described methods, it is characterized in that 14, described Exterior Communications System is gsm system or PSTN system; The described signaling that receives from gsm system or PSTN system of steps A is carried to subscriber signal UUS signaling by short message SMS signaling or unstructured supplementary service data USSD signaling or user; The signaling that step B is described to mail to gsm system or PSTN system is carried by Telephone User Part TUP or ISUP ISUP or carrying independent call control BICC signaling; The described signaling that mails to the PoC service communication system of step B is carried by session initiation protocol SIP signaling.

15, according to Claim 8 or 11 described methods, it is characterized in that, described Exterior Communications System is gsm system or PSTN system, the indication of described right to speak is carried by SMS or USSD or UUS signaling, and described right to speak control signaling is carried by the right to speak control Floor Control signaling of PoC service.

16, according to claim 9 or 12 described methods, it is characterized in that, described Exterior Communications System is gsm system or PSTN system, the announcement information of described SGW and gsm system or PSTN system interaction is carried by SMS or USSD or UUS signaling, and the mutual announcement information of described SGW and PoC service communication system is carried by the notice Notify message of SIP.