CN100544466C - Realize the cellular system and the method for PTT service - Google Patents

Realize the cellular system and the method for PTT service Download PDF

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Publication number
CN100544466C
CN100544466C CN200510005349.5A CN200510005349A CN100544466C CN 100544466 C CN100544466 C CN 100544466C CN 200510005349 A CN200510005349 A CN 200510005349A CN 100544466 C CN100544466 C CN 100544466C
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poc
media
control unit
call control
module
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CN1816179A (en
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罗龙
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2006/000145 priority patent/WO2006081758A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/102—Gateways
    • H04L65/1043—Gateway controllers, e.g. media gateway control protocol [MGCP] controllers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/40—Support for services or applications
    • H04L65/403—Arrangements for multi-party communication, e.g. for conferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
    • H04L67/63—Routing a service request depending on the request content or context

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephonic Communication Services (AREA)

Abstract

The invention discloses a kind of cellular system of realizing the PTT PoC service, this system comprises call control layer and medium processing layer; Comprise PoC media processing units in the described medium processing layer greater than one; Described call control layer is used for the mutual signaling with user terminal UE, sends the media processing resources request for allocation to the medium processing layer; After described medium processing layer receives described request, wherein the PoC media processing units greater than on the media delivery path provides media processing resources according to described media processing resources request for allocation for current PoC session, and is the UE media stream in the current PoC session group.The present invention also provides a kind of method that realizes PoC service, uses PoC service network architecture of the present invention and method and can realize PoC service control and separating of carrying.

Description

Realize the cellular system and the method for PTT service
Technical field
The present invention relates to PTT on a kind of cellular system (PoC) service technique, particularly realize the cellular system and the method for PoC service.
Background technology
At present, 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, be existing mobile system and traditional voice calling system can't provide, its internet protocol-based (IP) network, cost is well below common mobile phone speech business, when satisfying calling in real time, can accomplish the expense minimum.
In the PoC service network, mainly comprise five kinds of entities: one, subscriber terminal equipment (UE) is used to move the application software of PoC client; Two, IP Multimedia System (IMS) core, it comprises a plurality of initial session protocols (SIP) agency and registrar, realizes the interface of SIP signaling decompress(ion), mandate, maintenance registration and the SIP dialog state and the charge system of SIP signalling route, user terminal; Three, groups of users/contact list management server is used to realize the management of user's group, contact list and access list; Four, PoC server (PoC Server), SIP, real-time transport protocol (rtp)/real-time Transmission control (RTCP) data flow that is used to terminate, and realize that SIP dialog is handled, group access control, group conversation are handled, user capture control, do not bother function, resource control, calling user identification, speech quality feedback, billing interface and voice distribution etc.; Five, state showing server (PresenceServer) is used for management and record active user and network state.
Wherein, PoC Server is the whole controlled entity in the PoC service network, the main SIP signaling of being responsible for handling in the PoC service session foundation/dispose procedure is finished medium and is handled and distribute, obtain and carry out session/user's strategy, carries out right to speak control (Floor Control) or the like in conversation procedure.Here, described strategy comprises: the PoC service implementation strategy of user's CAMEL-Subscription-Information, operator configuration, capability negotiation obtains when setting up from the session group control information of groups of users/contact list management server and user conversation medium processing policy or the like.Figure 1A is the annexation schematic diagram of basic processing unit and UE in the existing PoC network architecture, and this figure is described the basic processing unit of existing PoC network architecture from PoC Server aspect, and therefore, this basic processing unit is PoC Server.Wherein, solid line presentation medium flow transmission path, dotted line represents that signaling connects.Shown in Figure 1A, PoC Server and UE are that UE sets up PoC session by mutual SIP signaling, and are responsible for the media flow transmission after session is set up simultaneously.
According to above description as seen, existing P oC Server is integrated in signaling and medium processing all over the body, and like this, the technical sophistication degree that PoC Server realizes is inevitable quite high, also will seriously limit it simultaneously and further expand traffic handing capacity.Therefore, not only when setting up the PoC service network, the realization cost of PoC Server is higher; And, no matter when the business function upgrading/deployment of signaling level, still when the exchange of media capacity upgrade of medium level, all need the PoC Server that upgrades, make that the device upgrade cost is higher; And during the subsequent expansion volume of business, the dilatation leeway of PoC Server is less, often needs to dispose another set of new PoC Sever equipment and handles Added Business, can not effectively guarantee system reliability.
In addition, because the signaling and the Media Stream of PoC service must pass through PoC Server route, like this, on PoC Server aspect, signaling adopts identical transmission path with Media Stream.In PoC service, for the session of a group, PoC Server is from being divided into two classes in logic: Controlling PoCServer and Participating PoC Server.Described Participating PoC Server is used for receiving the SIP signaling from the IMS territory and resolves, and signaling is routed to the ControllingPoC Server of current sessions by the IMS territory; Described Controlling PoC Server is used for that process is set up in session and carries out integral body control, and session carried out integrated management, according to the SIP signaling that receives the service attribute of calling/called and current sessions is analyzed, by the IMS territory SIP signaling is distributed to called, and the duplicating and distribute of responsible current sessions Media Stream.
Fig. 2 A forms structural representation for existing PoC network architecture, and Fig. 2 A mainly describes the transmission path of signaling and Media Stream in the existing PoC service.Wherein, solid line presentation medium flow transmission path, dotted line represents that signaling connects.Shown in Fig. 2 A, UE1 is sent to the SIP signaling by participation (Participating) PoCServer under self control (Controlling) the PoC Server of current sessions, this Controlling PoC Server resolves the SIP signaling that receives, and again signaling is sent to UE2 by the Participating PoC Server under the callee UE2.After PoC session is set up, Media Stream between UE1 and the UE2 need transmit by the path identical with the signaling transmission, that is: Media Stream is from UE1, pass through Participating PoC Server1, Controlling PoC Server, Participating PoC Server2 successively, finally arrive UE2.
But the transmission path of Media Stream might not be identical with the node in the signaling transmission path, such as: Media Stream also may be finished transmission course without Participating PoC Server1 and/or Participating PoCServer2 among Fig. 2 A.So, some signaling transmission path is redundant for Media Stream, and, the corresponding usually a large amount of recipient UE of the transmission of each Media Stream in the PoC session, here illustrational only is the redundant transmission situation that is produced during at corresponding recipient UE, this shows that the media flow transmission mechanism in the existing PoC network architecture will produce the redundant route of broad medium stream.
In sum, the networking structure of existing PoC service, especially the treatment mechanism on PoC Server aspect, preferable realization basis can't be provided for the development of following PoC service, not only when expanding, business goes wrong easily as mentioned above, and also will be difficult during with the network integration that control separates with other carrying at the PoC service network.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of cellular system of realizing PoC service, PoC service branch signaling and two levels of medium can be handled, thereby realize PoC service carrying and separating of controlling.
Another object of the present invention is to provide a kind of method that realizes PoC service, can set up the PoC service session, and realize media delivery based on PoC network architecture of the present invention.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses a kind of cellular system of realizing PoC service, this cellular system comprises:
Call control layer is used for the mutual signaling with user terminal UE, sends the media processing resources request for allocation to the medium processing layer;
The medium processing layer provides media processing resources according to described media processing resources request for allocation for current PoC session, and is the UE media stream in the current PoC session group.
Wherein, described call control layer is made up of one or more PoC Call Control Unit; Described medium processing layer is made up of one or more PoC media processing units;
Described PoC Call Control Unit with the mutual call signaling of UE, sends the media processing resources request for allocation to described PoC media processing units;
Described PoC media processing units provides media processing resources according to the media processing resources request for allocation from the PoC Call Control Unit for current PoC session, and is the UE media stream in the current PoC session group.
Wherein, in one or more PoC Call Control Unit of described composition call control layer, have a PoC Call Control Unit at least as the control PoC Call Control Unit in the PoC session, this control PoC Call Control Unit comprises:
The relay and control module receives from the call signaling of UE and is forwarded to centralized control module, will be distributed to UE from the call signaling of centralized control module;
Centralized control module, according to from the call signaling of relay and control module from tactful processing module fetch strategy information, and according to this policy information structure call signaling and export the relay and control module to, send the media processing resources request for allocation to the PoC media processing units;
The strategy processing module receives policy information and preservation from external entity, and the media strategy information in this policy information is sent to the PoC media processing units.
Wherein, described PoC media processing units from the request of control PoC Call Control Unit receiving media processing resource allocation is control PoC media processing units, and this control PoC media processing units comprises:
The relay media module receives from the Media Stream of UE and is forwarded to the centralized media module, will be distributed to UE from the Media Stream of centralized media module;
The centralized media module, reception is from the media processing resources request for allocation of centralized control module, distribute and the startup media processing resources, to be forwarded to medium process module from the Media Stream of relay media module, extract media strategy information according to Media Stream from the media strategy module from the relay media module, and press these media strategy information transmission medium and handle indication to medium process module, will be sent to the relay media module from the Media Stream of medium process module;
The media strategy module receives described media strategy information from described tactful processing module and preserves;
Medium process module is handled indication according to described medium and is extracted media strategy information from the media strategy module, and by this media strategy information to handling from the Media Stream of centralized media module, the Media Stream after will handling again is sent to the centralized media module.
Wherein, when described call control layer is made up of an above PoC Call Control Unit, in this above PoC Call Control Unit, except that described control PoC Call Control Unit, also have a PoC Call Control Unit at least as the participation PoC Call Control Unit in the PoC session, this participation PoC Call Control Unit comprises:
The relay and control module, reception is from the call signaling of control PoC Call Control Unit in UE or the current PoC session,, and determine call signaling is forwarded to control PoC Call Control Unit or UE in the current PoC session from tactful processing module fetch strategy information according to this call signaling according to this policy information;
The strategy processing module receives policy information from external entity and preserves.
Wherein, in the described participation PoC Call Control Unit: described relay and control module further sends the media processing resources request for allocation to the PoC media processing units; Described tactful processing module further is sent to the PoC media processing units with the media strategy information in the policy information of being preserved.
Wherein, described PoC media processing units from the request of participation PoC Call Control Unit receiving media processing resource allocation is participation PoC media processing units, and this participation PoC media processing units comprises:
The relay media module, reception is from the media processing resources request for allocation of relay and control module, distribute and the startup media processing resources, the Media Stream of the PoC media processing units that reception is connected from UE or control PoC Call Control Unit also is forwarded to medium process module, from the media strategy module, extract media strategy information according to this Media Stream, send medium by this media strategy information and handle indication, will and export PoC media processing units or the UE that control PoC Call Control Unit is connected to from the Media Stream of medium process module to medium process module;
The media strategy module, the tactful processing module receiving media policy information from described participation PoC Call Control Unit is also preserved;
Medium process module is handled indication according to described medium and is extracted media strategy information from the media strategy module, and to handling from the Media Stream of relay media module, the Media Stream after will handling again is sent to the relay media module by this media strategy information.
Wherein, between described call control layer and medium processing layer, further comprise:
Media control layer is identified for transmitting the PoC media processing units of current PoC session Media Stream according to the media processing resources request for allocation from the PoC Call Control Unit, and sends the media processing resources assignment commands to determined PoC media processing units;
Described PoC media processing units is handled resource according to the media processing resources assignment commands allocation medium that receives.
Wherein, described media control layer is made up of one or more PoC media control unit;
Described PoC media control unit, be used for according to the PoC media processing units that is identified for transmitting current PoC session Media Stream from the media processing resources request for allocation of PoC Call Control Unit, and send the media processing resources assignment commands to determined PoC media processing units.
Wherein, in one or more PoC Call Control Unit of described composition call control layer, have a PoC Call Control Unit at least as the control PoC Call Control Unit in the PoC session, this control PoC Call Control Unit comprises:
The relay and control module receives from the call signaling of UE and is forwarded to centralized control module, will be distributed to UE from the call signaling of centralized control module;
Centralized control module, according to from the call signaling of relay and control module from tactful processing module fetch strategy information, and according to this policy information structure call signaling and export the relay and control module to, send the media processing resources request for allocation to the PoC media control unit that self connects;
The strategy processing module receives policy information and preservation from external entity, and the media strategy information in this policy information is sent to the PoC media processing units by the PoC media control unit that self connects.
Wherein, described reception is a control PoC media processing units by the PoC media processing units of the media processing resources assignment commands that control PoC Call Control Unit triggers, and this control PoC media processing units comprises:
The relay media module receives from the Media Stream of UE and is forwarded to the centralized media module, will be distributed to UE from the Media Stream of centralized media module;
The centralized media module, reception is from the media processing resources assignment commands of PoC media control unit, distribute and the startup media processing resources, to be forwarded to medium process module from the Media Stream of relay media module, extract media strategy information according to Media Stream from the media strategy module from the relay media module, and press these media strategy information transmission medium and handle indication to medium process module, will be sent to the relay media module from the Media Stream of medium process module;
The media strategy module receives described media strategy information from described PoC media control unit and preserves;
Medium process module is handled indication according to described medium and is extracted media strategy information from the media strategy module, and by this media strategy information to handling from the Media Stream of centralized media module, the Media Stream after will handling again is sent to the centralized media module.
Wherein, when described call control layer is made up of an above PoC Call Control Unit, in this above PoC Call Control Unit, except that described control PoC Call Control Unit, also have a PoC Call Control Unit at least as the participation PoC Call Control Unit in the PoC session, this participation PoC Call Control Unit comprises:
The relay and control module, reception is from the call signaling of control PoC Call Control Unit in UE or the current PoC session,, and determine call signaling is forwarded to control PoC Call Control Unit or UE in the current PoC session from tactful processing module fetch strategy information according to this call signaling according to this policy information;
The strategy processing module receives policy information from external entity and preserves.
Wherein, in the described participation PoC Call Control Unit: described relay and control module further sends the media processing resources request for allocation to the PoC media control unit that self connects; Described tactful processing module further is sent to the PoC media processing units with the media strategy information in the policy information of being preserved by this PoC media control unit.
Wherein, described reception is to participate in the PoC media processing units by the PoC media processing units of the media processing resources assignment commands that participates in the triggering of PoC Call Control Unit, and this participation PoC media processing units comprises:
The relay media module, reception is from the media processing resources assignment commands of PoC media control unit, distribute and the startup media processing resources, the Media Stream of the PoC media processing units that reception is connected from UE or control PoC Call Control Unit also is forwarded to medium process module, from the media strategy module, extract media strategy information according to this Media Stream, send medium by this media strategy information and handle indication, will and export PoC media processing units or the UE that control PoC Call Control Unit is connected to from the Media Stream of medium process module to medium process module;
The media strategy module is from described PoC media control unit receiving media policy information and preservation;
Medium process module is handled indication according to described medium and is extracted media strategy information from the media strategy module, and to handling from the Media Stream of relay media module, the Media Stream after will handling again is sent to the relay media module by this media strategy information.
Wherein, described control PoC Call Control Unit further comprises:
Notification handler module from external entity reception notification information, from described tactful processing module fetch strategy information, and is distributed to UE by this policy information with announcement information according to this announcement information.
Wherein, described participation PoC Call Control Unit further comprises:
Notification handler module from control PoC Call Control Unit reception notification information, from described tactful processing module fetch strategy information, and is determined the information of issuing a notice to UE according to this policy information according to this announcement information.
The invention also discloses a kind of method that realizes PoC service, this method is applied to comprise in the network architecture of call control layer and medium processing layer, described call control layer is made up of the PoC Call Control Unit, described medium processing layer is made up of the PoC media processing units, it is characterized in that this method comprises:
A. calling party UE sends session foundation and asks the Call Control Unit to PoC;
The B.PoC Call Control Unit is set up request structure media processing resources request for allocation according to this session, and is each callee UE structure session foundation request of current sessions; The session request of setting up of being constructed is distributed to each callee UE, the media processing resources request for allocation of being constructed is sent to the PoC media processing units of self-management, and described PoC media processing units is handled resource according to this media processing resources request for allocation allocation medium;
C. calling party and callee's UE is by PoC media processing units media stream.
Wherein, same PoC Call Control Unit under described calling party UE and each the callee UE, and be the control PoC Call Control Unit of current sessions.
In the steps A, described PoC Call Control Unit is a PoC Call Control Unit under the calling party UE, and is the control PoC Call Control Unit of current sessions;
Among the step B, the PoC Call Control Unit that request and media processing resources request for allocation are set up in described structure session is the described control of a steps A PoC Call Control Unit;
The participation PoC Call Control Unit that in the PoC Call Control Unit under each callee UE one or more PoC Call Control Unit to be arranged be current sessions;
Other PoC Call Control Unit in the PoC Call Control Unit under each callee UE except that described participation PoC Call Control Unit is the described control of a steps A PoC Call Control Unit;
Described control PoC Call Control Unit with the method that the session request of setting up of being constructed is distributed to each callee UE is:
When the PoC Call Control Unit under the callee UE was participation PoC Call Control Unit, the described control of steps A PoC Call Control Unit was sent to this callee UE by this participation PoC Call Control Unit with the session request of setting up;
When the PoC Call Control Unit under the callee UE was the described control of steps A PoC Call Control Unit, this control PoC Call Control Unit directly was sent to this callee UE with the session request of setting up.
Wherein, the PoC Call Control Unit under the calling party UE is the participation PoC Call Control Unit of current sessions;
In the steps A, the method that described calling party UE sends session foundation request is: calling party UE is sent to the session request of setting up that receives by current participation PoC Call Control Unit the control PoC Call Control Unit of current sessions;
Among the step B, described PoC Call Control Unit is current control PoC Call Control Unit, and the PoC Call Control Unit under each UE of described callee is this control PoC Call Control Unit.
Wherein, the PoC Call Control Unit under the described calling party UE is the participation PoC Call Control Unit of current sessions;
In the steps A, the method that described calling party UE sends session foundation request is: calling party UE is sent to the session request of setting up that receives by current participation PoC Call Control Unit the control PoC Call Control Unit of current sessions;
Among the step B, the PoC Call Control Unit that request and media processing resources request for allocation are set up in described structure session is current control PoC Call Control Unit;
The participation PoC Call Control Unit that in the PoC Call Control Unit under each callee UE one or more PoC Call Control Unit to be arranged be current sessions;
Other PoC Call Control Unit in the PoC Call Control Unit under each callee UE except that described participation PoC Call Control Unit is current control PoC Call Control Unit;
Described control PoC Call Control Unit with the method that the session request of setting up of being constructed is distributed to each callee UE is:
When the PoC Call Control Unit under the callee UE was participation PoC Call Control Unit, current control PoC Call Control Unit was sent to this callee UE by this participation PoC Call Control Unit with the session request of setting up;
When the PoC Call Control Unit under the callee UE was current control PoC Call Control Unit, this control PoC Call Control Unit directly was sent to this callee UE with the session request of setting up.
Among the step B, described PoC media processing units according to the method for handling resource from the media processing resources request for allocation allocation medium of control PoC Call Control Unit is:
Described control PoC Call Control Unit is after receiving session foundation request and before request is set up in the transmission session, structure media processing resources request for allocation also sends to described PoC media processing units, and this PoC media processing units is that current sessions is divided useable medium processing resource according to this media processing resources request for allocation; This control PoC Call Control Unit is after the response message that receives the session foundation request that self has sent, send media processing resources and start request to this PoC media processing units, this PoC media processing units activates the useable medium of self having divided and handles resource; Perhaps, described control PoC Call Control Unit is after the response message that receives the session foundation request that self has sent, construct media processing resources request for allocation and media processing resources startup request and send to described PoC media processing units according to this session request of setting up, this PoC media processing units is that useable medium processing resource is divided and activated to current sessions.
Among the step C, described PoC media processing units is the PoC media processing units that described control PoC Call Control Unit is managed.
Wherein, this method further comprises: one or more in the described participation PoC Call Control Unit participate in the PoC Call Control Unit, set up request structure media processing resources request for allocation and send to the PoC media processing units of management separately according to the session that receives, this PoC media processing units is handled resource according to this media processing resources request for allocation allocation medium;
Among the step C, described PoC media processing units comprises: PoC media processing units and described one or more that described control PoC Call Control Unit is managed participate in the PoC media processing units that the PoC Call Control Unit is managed.
Wherein, described PoC media processing units according to the method for handling resource from the media processing resources request for allocation allocation medium that participates in the PoC Call Control Unit is:
Described participation PoC Call Control Unit is after receiving session foundation request and before request is set up in the transmission session, structure media processing resources request for allocation also sends to described PoC media processing units, and this PoC media processing units is that current sessions is divided useable medium processing resource according to this media processing resources request for allocation; This participation PoC Call Control Unit is after the response message that receives the session foundation request that self has sent, send media processing resources and start request to this PoC media processing units, this PoC media processing units activates the useable medium of self having divided and handles resource; Perhaps, described participation PoC Call Control Unit is after the response message that receives the session foundation request that self has sent, construct media processing resources request for allocation and media processing resources startup request and send to described PoC media processing units according to this session request of setting up, this PoC media processing units is that useable medium processing resource is divided and activated to current sessions.
By such scheme as can be seen, key of the present invention is: whole PoC service network is divided into call control layer and medium processing layer, wherein, the PoC Call Control Unit of forming call control layer, with the mutual signaling of UE, PoC session is carried out integral body control, send the media processing resources request for allocation to the medium processing layer; The PoC media processing units of forming the medium processing layer then provides media processing resources according to the media processing resources request for allocation that receives for current PoC session, finishes the transmission of Media Stream in the PoC session.
Therefore, the network architecture of realization PoC service provided by the present invention and method can be separated the media bearer and the signaling control of PoC service, and the transmission path of Media Stream is no longer dependent on the signaling process node, thereby has significantly reduced the redundant route of Media Stream; And, because media control layer can manage concentratedly whole media processing resources, therefore can determine the media flow transmission path of current sessions flexibly according to factors such as the media processing capacity of the processing resource status of current PoC media processing units, UE and operator's media resource configurations; In addition, medium are handled and to be carried out at different network entities respectively with signaling process, are more prone to realize the single capacity upgrade of medium in the network or signaling, also are convenient to PoC service and realize fusion with the NGN network that carrying and control are separated.
Description of drawings
Figure 1A is for having now in the PoC network architecture as the PoC Server of basic processing unit and the annexation schematic diagram of UE;
Figure 1B is the annexation schematic diagram of basic processing unit in the PoC network architecture of the present invention and UE;
Fig. 2 A forms structural representation for existing PoC network architecture;
Fig. 2 B forms structural representation for PoC network architecture of the present invention;
Fig. 3 A forms structural representation for basic processing unit one preferred embodiment as control role (Controlling Role) in the PoC network architecture of the present invention;
Fig. 3 B is for forming structural representation as basic processing unit one preferred embodiment that participates in role (Participating Role) in the PoC network architecture of the present invention;
Fig. 4 is the inventive method one preferred embodiment handling process schematic diagram;
Fig. 5 is another preferred embodiment handling process schematic diagram of the inventive method.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
The invention provides a kind of cellular system of realizing PoC service, comprising: call control layer and medium processing layer, finish calling control and the medium processing capacity of PoC Server in the existing network respectively.Described call control layer with the mutual signaling of UE, carries out integral body control to PoC session, sends the media processing resources request for allocation to the medium processing layer; The medium processing layer provides media processing resources according to described media processing resources request for allocation for current PoC session, finishes the transmission of Media Stream in the PoC session.Described call control layer and medium processing layer are made up of one or more PoC Call Control Unit and one or more PoC media processing units respectively, and by described PoC Call Control Unit and PoC media processing units finish place layer separately inter-process and with the information interaction of outside.
In order to realize that the media processing resources in the medium processing layer is concentrated, managed flexibly, the present invention has also further increased media control layer between described call control layer and medium processing layer, be used for the media processing resources of medium processing layer is managed concentratedly, after receiving the media processing resources request for allocation of PoC Call Control Unit, be defined as current sessions and distribute which PoC media processing units, send the media processing resources assignment commands then to determined PoC media processing units; This determined PoC media processing units is handled resource according to the media processing resources assignment commands allocation medium that receives again.
Below in conjunction with Figure 1B and Fig. 2 B formation to the basic processing unit in the PoC network architecture of the present invention, and the relation between each level is described in the overall network framework.Because, the present invention is only improved the PoC Server aspect in the existing PoC service network, for other major part in the described network of background technology: UE, IMS, groups of users/contact list management server and Presence Server do not do change, therefore, do not describe for this part this paper that does not do change.
Figure 1B is the annexation schematic diagram of basic processing unit in the PoC network architecture of the present invention and UE.Wherein, solid line presentation medium flow transmission path, dotted line represents that signaling connects.Shown in Figure 1B, this basic processing unit comprises: PoC Call Control Unit, PoC media control unit and PoC media processing units.Wherein, the mutual SIP signaling of PoC Call Control Unit and UE, and send H.248 media processing resources request for allocation to the PoC media control unit according to the SIP signaling that receives; This PoC media control unit is according to the processing resource status of self registered PoC media processing units, sends the media processing resources assignment commands to the PoC media processing units by signaling H.248; This PoC media processing units is handled resource for the current sessions allocation medium, and UE can use this PoC media processing units media stream thereby PoC session is set up the back.
Fig. 2 B forms structural representation for PoC network architecture of the present invention.Wherein, solid line presentation medium flow transmission path, dotted line represents that signaling connects.Shown in Fig. 2 B, this network architecture is divided into three levels: call control layer, media control layer and medium processing layer, described call control layer is made up of the PoC Call Control Unit, and described media control layer is made up of the PoC media control unit, and described medium processing layer is made up of the PoC media processing units.According to the characteristics of PoC service standard, PoC Call Control Unit of the present invention also is divided into two classes: Participating PoC Call Control Unit and Controlling PoC Call Control Unit also have belongingness between UE and the PoC Call Control Unit simultaneously.Among Fig. 2 B, at call control layer, UE1 is sent to the SIP signaling by the Participating PoC Call Control Unit 1 under self the Controlling PoC Call Control Unit of current sessions, this Controlling PoC Call Control Unit is resolved the SIP signaling that receives, and by the Participating PoC Call Control Unit under the callee UE2 2 signaling is sent to UE2 again.Simultaneously, Controlling PoC Call Control Unit also sends H.248 media processing resources request for allocation to the PoC media control unit according to the SIP signaling that receives; This PoC media control unit is determined the PoC media processing units that current sessions should use according to the operating position of current self registered PoC media processing units, and send H.248 media processing resources assignment commands to determined PoC media processing units, thereby this PoC media processing units can be distributed available media processing resources for current sessions.Then, at the medium processing layer, can be between UE1 and the UE2 by this PoC media processing units interactive media stream.As seen, the transmission path of current media stream is: from UE1, through the PoC media processing units, arrive UE2 then, compare with the media flow transmission path of five processing nodes of comprising shown in Fig. 2 A: UE1, Participating PoC Server1, Controlling PoCServer, Participating PoC Server2 and UE2, redundant route significantly reduces.
Here, when setting up PoC session, Controlling PoC Call Control Unit must be that current sessions distributes a PoC media processing units by the PoC media control unit that self connects, this PoC media processing units also needs Media Stream is duplicated and to distribute according to called subscriber's situation of current sessions except being responsible for processing such as Media Stream forwardings, code/decode format conversion, rate adapted.Simultaneously, the factors such as disposal ability of deployment of the media processing resources of the media processing capacity of the distribution situation of UE, UE, operator and PoC media processing units when setting up at various sessions, Participating PoC Call Control Unit 1 and/or Participating PoC Call Control Unit 2 also may distribute other PoC media processing units to come media stream by the PoC media control unit that self connects.
Shown in Fig. 2 B, Participating PoC Call Control Unit 1 can distribute PoC media processing units 1 by the PoC media control unit 1 that self connects, and Participating PoC Call Control Unit 2 also can distribute PoC media processing units 2 by the PoC media control unit 2 that self connects.Like this, multiple combined situation has just appearred in the media flow transmission path among Fig. 2 B.Wherein, the PoC media processing units is necessary, and 2 of PoC media processing units 1 and PoC media processing units are selectable.Therefore, the maximum situation of the processing node that comprises in the transmission path is for comprising five processing nodes, shown in chain-dotted line among Fig. 2 B, transmission path in such cases is: from UE1, pass through PoC media processing units 1, PoC media processing units, PoC media processing units 2 successively, and finally arrive UE2.In the network architecture of the present invention, between two UE during media stream at most through five processing nodes, with in the existing PoC network architecture during two UE media streams the node number of process identical, so, with respect to prior art, generally, PoC network architecture of the present invention can reduce the redundancy in media flow transmission path in various degree.
But, the PoC media processing units that Participating PoC Call Control Unit is distributed is not carried out duplicating and distribution processor of Media Stream, that is to say: the PoC media processing units that Participating PoC Call Control Unit is distributed, compare the function difference of the two realization with the PoC media processing units that Controlling PoC Call Control Unit is distributed.Therefore, the present invention is called Participating PoC media processing units with the PoC media processing units that Participating PoC Call Control Unit distributes, the PoC media processing units that Controlling PoC Call Control Unit is distributed is called Controlling PoC media processing units, then PoC media processing units 1 and PoC media processing units 2 are called Participating PoC media processing units 1 and Participating PoC media processing units 2 among Fig. 2 B, and the PoC media processing units is called Controlling PoC media processing units.In a word, for a PoC session, processing entities on the media flow transmission path must comprise the Controlling PoC media processing units that Controlling PoC Call Control Unit is distributed, the Participating PoC media processing units that also may exist other Participating PoC Call Control Unit to be distributed on this media flow transmission path, be used for being responsible for processing such as Media Stream forwarding, code/decode format conversion, rate adapted, but do not participate in duplicating and distribution processor of Media Stream.
In Fig. 2 B illustrated embodiment, UE1 and UE2 belong to the Participating PoC Call Control Unit of current sessions respectively; Equally, according to the PoC service standard, the PoC Call Control Unit that UE1 and/or UE2 belonged to also may be for the Controlling PoC Call Control Unit of current sessions, then at call control layer, UE1 and/or UE2 directly and Controlling PoC Call Control Unit carry out Signalling exchange.In addition, the network architecture in the present embodiment comprises: call out control, medium control and medium and handle three levels.If the network size that PoC service is used is little, when the complexity of allocation medium processing resource was not high, network architecture also can only comprise: call control layer and medium processing layer.At this moment, the PoC Call Control Unit directly links to each other with the PoC media processing units, and needs the corresponding relation between pre-configured PoC Call Control Unit of network and the PoC media processing units, and other syndeton is constant, no longer describes in detail here.
According to above description as seen, in network architecture of the present invention, the signaling that the transmission path of Media Stream and session are set up in the process is also irrelevant through which processing node, Media Stream the processing node that should pass through then decide by the media processing capacity of UE and PoC media processing units, the medium correlative factors such as media resource deployment of operator, realize that really the control of media bearer and signaling is separated.
Below in conjunction with Fig. 3 A and Fig. 3 B structure is formed in the inside of basic processing unit in the PoC network architecture of the present invention and describe, described basic processing unit comprises: PoC Call Control Unit, PoC media control unit and PoC media processing units.For same basic processing unit physically, its role (Role) in different PoC session may be different, such as: in a certain session, be Controlling Role, and be Participating Role in another session.Wherein, basic processing unit as Controlling Role comprises Controlling PoC Call Control Unit and Controlling PoC media processing units, and comprise Participating PoC Call Control Unit and Participating PoC media processing units as the basic processing unit of Participating Role, the function difference of these two kinds of basic processing units, this paper will be described these two kinds of basic processing units respectively.
Fig. 3 A forms structural representation for basic processing unit one preferred embodiment as Controlling Role in the PoC network architecture of the present invention.This basic processing unit comprises: Controlling PoC Call Control Unit, PoC media control unit and Controlling PoC media processing units.This ControllingPoC Call Control Unit comprises: concentrate (Focus) control module, relaying (Relay) control module and tactful processing module.Because, medium in the PoC session send and need handle according to group information, user signing contract information etc., and, the media processing capacity of each UE may be different, therefore safeguard current sessions corresponding strategies information by tactful processing module in the Controlling PoC Call Control Unit, described policy information comprises: media capability information of user signing contract information, group information, session control information, UE or the like.In addition, Controlling PoC Call Control Unit also needs to send the announcement information from UE or network side, and therefore, Controlling PoC Call Control Unit also further comprises the notification handler module that is used to transmit announcement information.Accordingly, this Controlling PoC medium process module comprises: Relay media module, Focus media module, media strategy module and medium process module.
In Controlling PoC Call Control Unit side: the Relay control module, reception is from SIP and the Floor Control signaling of UE and forward it to the Focus control module, receives SIP and Floor Control signaling and is distributed to each UE from the Focus control module.The strategy processing module, receive UE or operator's configured strategy information from external entity, usually preserve this policy information with XML (extensible Markup Language) (XML) file format, and the media strategy information of inciting somebody to action wherein is sent to described media strategy module by the PoC media control unit, wherein group information, user signing contract information etc. are offered notification handler module, and UE also can inquire about the policy information of being preserved by the interface of PoC client and this strategy processing module simultaneously.Notification handler module receives from the UE of current sessions group or the announcement information of operator from external entity, according to the policy information that extracts from tactful processing module announcement information is handed down to each UE this group.The Focus control module, reception is from the SIP and the FloorControl call signaling of Relay control module, resolve the SIP signaling, according to policy informations such as the group information that extracts from tactful processing module, session control information, construct new SIP signaling and be distributed to each called UE of current sessions, finish the right to speak control of current sessions and right to speak information is sent to the Focus media module by the PoC media control unit according to Floor Control signaling simultaneously by the Relay control module; In addition, described Focus control module also sends H.248 media processing resources request for allocation to the PoC media control unit, send H.248 media processing resources assignment commands to the Focus media module by this PoC media control unit, this Focus control module is also according to the analysis result of situation and the SIP signaling of Floor Control, and the right to speak information of current sessions and the user profile that participates in session are sent to the Focus media module by the PoC media control unit.
Wherein, the policy information that Controlling PoC Call Control Unit relates to is main relevant with the group of current sessions, this policy information has been described the business game that should carry out each user in this group, comprise: the UE number that this group inserts at most, media processing capacity of each UE or the like, described media strategy information spinner will refer to the media capability information of current participation session UE, comprising: voice encoding and decoding format, speed etc.
In Controlling PoC media processing units side: the Relay media module receives from the Media Stream of UE and is forwarded to the Focus media module, from Focus media module receiving media stream and be distributed to each UE that participates in session.The media strategy module is from media strategy information and the preservation of PoC media control unit reception from tactful processing module.The Focus media module before media delivery, is finished the registration of self place PoC media processing units alternately by H.248 message and PoC media control unit, receives the media resource assignment commands from the PoC media control unit, and allocation medium is handled resource; When media delivery, reception is from the Media Stream of Relay media module, according to media strategy information of extracting from the media strategy module and the right to speak information that receives from the PoC media control unit, judge whether Media Stream to be distributed and how to distribute and construct medium and handle indication, then this medium are handled indication and Media Stream is sent to medium process module, receive the Media Stream after processing and be distributed to each UE from this medium process module simultaneously by the Relay media module.Medium process module, receiving media stream, and handle indication according to the medium of Focus media module, extract in the media strategy module related media policy information to Media Stream duplicate, processing such as voice encoding and decoding format conversion, rate adapted, the Media Stream after will handling then sends to the Focus media module.
Fig. 3 B forms structural representation for basic processing unit one preferred embodiment as Participating Role in the PoC network architecture of the present invention.This basic processing unit comprises: Participating PoC Call Control Unit, PoC media control unit and Participating PoC media processing units.This Participating PoC Call Control Unit comprises: Relay control module, tactful processing module.In order to realize the forwarding from UE or network side announcement information, this Participating PoC Call Control Unit also further comprises notification handler module; Accordingly, this PoC media processing units comprises: Relay media module, media strategy module and medium process module.
Wherein, the Relay control module, reception is from the SIP and the Floor Control signaling of UE or Controlling PoC Call Control Unit, the fetch strategy information from tactful processing module according to this SIP signaling and Floor Control signaling, and be forwarded to outside UE or Controlling PoC Call Control Unit by this policy information and with signaling, also send H.248 media processing resources request for allocation simultaneously to the PoC media control unit.The strategy processing module, receive UE or operator's configured strategy information from external entity, preserve this policy information with the XML file format, and the media strategy information of inciting somebody to action wherein is sent to described media strategy module by the PoC media control unit, wherein group information, user signing contract information etc. are offered notification handler module, and UE also can inquire about the policy information of being preserved by the interface of PoC client and this strategy processing module simultaneously.Notification handler module from described control PoC Call Control Unit reception notification information, is handed down to each UE according to the policy information that extracts from tactful processing module with announcement information.The PoC media control unit, finish the registration of Participating PoC media processing units with the mutual H.248 signaling of Relay media module, reception is from the media processing resources request for allocation H.248 of Relay control module and send H.248 media processing resources assignment commands to the Relay media module, will be forwarded to the media strategy module from the media strategy information of tactful processing module.The Relay media module, reception is from the Media Stream of UE or Controlling PoC media processing units, extract media strategy information according to this Media Stream from the media strategy module, send medium by this media strategy information and handle to indicate and be forwarded to medium process module, be transmitted to described Controlling PoC media processing units or UE from medium process module receiving media stream and with it to medium process module and with Media Stream.Medium process module is handled indication according to the medium that receive and is extracted media strategy information from the media strategy module, and the Media Stream of receiving by this media strategy information butt joint carries out processing such as encoding and decoding speech conversion, rate adapted and exports to the Relay media module.
Here, the UE of the current calling that the policy information that Participating PoC Call Control Unit relates to is mainly managed with this Participating PoC Call Control Unit is relevant, this policy information has been described the business game that this UE should carry out in different sessions, comprise: the session numbers that this UE inserts at most, this UE role and media capability information or the like in different sessions, described media strategy information spinner will refer to the media capability information of this UE, comprising: language code/decode format, speed etc.
The basic processing unit as Participating Role shown in Fig. 3 B possesses signaling control and media processing capacity simultaneously, and in the overall network framework, also exist some only to possess the basic processing unit as Participating Role of signaling control ability, this kind basic processing unit only comprises Participating PoC Call Control Unit, it is basic identical that structure is formed in the inside of Participating PoC Call Control Unit shown in this Participating Poc Call Control Unit and Fig. 3 B, different is: the Relay control module needn't with the request of PoC media control unit interactive media processing resource allocation, tactful processing module needn't with PoC media control unit interactive media policy information.
Above-mentioned Fig. 3 A and Fig. 3 B are depicted as the composition structure of the basic processing unit in the three-decker PoC network architecture that possesses call control layer, media control layer and medium processing layer of the present invention.In the PoC network architecture that only possesses call control layer and medium processing layer of the present invention, basic identical shown in the composition of basic processing unit and Fig. 3 A and Fig. 3 B, different is, lack the PoC media control unit in the basic processing unit, then the PoC Call Control Unit information that mails to the PoC media processing units need not to handle through the PoC media control unit, but directly send by the PoC Call Control Unit, specifically be exactly: Focus control module in the Controlling PoC Call Control Unit sends the Focus media module of media processing resources request for allocation to the Controlling PoC media processing units, tactful processing module in the Controlling PoC Call Control Unit sends the media strategy module of media strategy information to the Controlling PoC media processing units, Relay control module in the Participating PoC Call Control Unit sends the Relay media module of media processing resources request for allocation to the Participating PoC media processing units, and the tactful processing module in the Participating PoC Call Control Unit sends the media strategy module of media strategy information to the Participating PoC media processing units.Other syndeton is constant, therefore is not described further here.
Because, PoC service is a kind of back-to-back user agent (B2BUA, Back to Back UserAgent) business of type, therefore can think: Controlling PoC Call Control Unit is logically by two user agent (UA, User Agent) form, these two UA set up session with caller and called subscriber respectively and carry out back-to-back mutual.Like this, in fact the session of the calling and called of setting up in PoC service is made up of two parts: at call control layer, be made up of to each called UE to Controlling PoC Call Control Unit and Controlling PoC Call Control Unit calling UE; At the medium processing layer, form to each called UE to Controlling PoC media processing units and Controlling PoC media processing units by calling UE.And between described UE and Controlling PoC Call Control Unit and between Controlling PoC media processing units and the UE, the transmission of call signaling and Media Stream may be transmitted processing through Partricipating PoC Call Control Unit and Partricipating PoC media processing units.
So, this paper describes for simplifying, with the wherein repeating process omission of Partricipating PoC Call Control Unit and Partricipating PoC media processing units, information interaction between Controlling PoC Call Control Unit, Controlling PoC media processing units and the UE is described as: Controlling PoC Call Control Unit is from UE receipt of call signaling and be distributed to UE, and the ControllingPoC media processing units is from UE receiving media stream and be distributed to UE.But this does not also mean that call signaling and the middle processing without Partricipating PoC Call Control Unit and PartricipatingPoC media processing units of Media Stream, here this is illustrated especially.
Based on above-described network architecture, and basic processing unit is formed structure in the network architecture, the present invention also provides a kind of method that realizes PoC service, the PoC Call Control Unit of forming call control layer is after the session foundation request that receives from UE, set up the analysis result of request according to this session, thereby structure and the distribution session request of setting up set up PoC session for other UE of current sessions group; Simultaneously, according to pre-configured media processing resources of operator and the media processing capacity of each relevant UE, the PoC Call Control Unit can send the relevant PoC media processing units of media processing resources request for allocation to the medium processing layer, this PoC media processing units is handled resource for the current sessions allocation medium, thereby in the media delivery process of current sessions, this PoC media processing units can be finished the media flow transmission of current group.
In order to manage media processing resources concentratedly, the present invention also provides the media control layer of being made up of the PoC media control unit, described PoC Call Control Unit at first is issued to the PoC media control unit with the media processing resources request for allocation, select the PoC media processing units by this PoC media control unit according to the operating position of the PoC media processing units of current self-management, and send the media processing resources assignment commands to selected PoC media processing units, again by this PoC media processing units according to the call allocation media processing resources that receives.
Fig. 4 is the inventive method one preferred embodiment handling process schematic diagram.In the present embodiment, UE1 is a calling part user, UE2 is callee user, UE1 and UE2 belong to Participating PoC Call Control Unit 1 and Participating PoC Call Control Unit 2 respectively, and, pre-configured according to operator, Participating PoC Call Control Unit 1 is that current sessions distributes ParticipatingPoC media processing units 1 and Participating PoC media processing units 2 with the PoC media control unit that Participating PoC Call Control Unit 2 all should be connected by self.
Because, the PoC Call Control Unit is when distributing the PoC media processing units for session, all at first send the media processing resources request for allocation to the PoC media control unit, send the media processing resources assignment commands to the PoC media processing units by the PoC media control unit again, this media processing resources assignment commands indication PoC media processing units allocation medium is handled resource.Therefore, describe for simplifying, among Fig. 4 the processing between PoC Call Control Unit and the PoC media control unit is omitted, and the PoC media control unit of ControllingPoC Call Control Unit and connection thereof is collectively referred to as the Controlling PoC Control Unit, Participating PoC Call Control Unit 1 and the PoC media control unit that connects thereof are collectively referred to as Participating PoC Control Unit 1, Participating PoC Call Control Unit 2 and the PoC media control unit that connects thereof are collectively referred to as Participating PoC Control Unit 2.
As shown in Figure 4, the concrete processing comprises:
Step 401:UE1 sends session and sets up the Participating PoC Control Unit 1 of request under self, and this request comprises: calling and called user profile, calling subscriber's media capability information etc.
Here, the described session request of setting up is carried by invitation (INVITE) message of SIP, and this request also can be carried by other message of Session Initiation Protocol or the message of other agreement, and the present invention does not limit this.
Step 402～step 403: the PoC media control unit in this Participating PoC Control Unit 1 is according to the media resource information of self preserving, the Participating PoC media processing units of selecting self to connect 1 is handled the Media Stream of current sessions, send the media processing resources assignment commands then to Participating PoC media processing units 1, this Participating PoC media processing units 1 echo reply is given this PoC media control unit.
Here, described media processing resources assignment commands and response message are respectively by the establishment of agreement (Create) message H.248 with reply (Res) message and carry, can be carried by other message of Session Initiation Protocol or the message of other agreement, the present invention does not limit this yet.
Wherein, each PoC media control unit all will be safeguarded media resource information after startup, this information essential record: in the sign of the registered PoC media processing units of this PoC media control unit, the resource user mode of each PoC media processing units and media processing capacity separately thereof.After each PoC media processing units powers on, all self identification, media resource user mode and media processing capacity are reported the PoC media control unit by message H.248, thus the registration process of finishing.After the PoC media control unit receives media processing resources request for allocation from the PoC Call Control Unit, be defined as current sessions according to the media resource user mode of each PoC media processing units and media processing capacity and distribute which PoC media processing units; Each PoC media processing units will be divided the available link resource for current sessions after the media processing resources assignment commands that receives from the PoC media control unit, then the link circuit resource sign of being divided is reported the PoC media control unit.After the PoC media control unit receives and starts request from the media processing resources of PoC Call Control Unit, send the media processing resources starting command to the PoC media processing units, the available link state of resources that this PoC media processing units has been divided self according to this media processing resources starting command is revised as activation, and amended Link State reported the PoC media control unit, promptly activate the useable medium of having divided and handle resource.Therefore, the PoC media control unit can real-time servicing media resource information.
Step 404:Participating PoC Control Unit 1 is forwarded to this INVITE according to the group information in the INVITE Controlling PoC Control Unit of current sessions group.
Step 405～step 406: the Controlling PoC media processing units 0 that the PoC media control unit in this Controlling PoC Control Unit connects according to the media resource Information Selection self of self preserving is handled the Media Stream of current sessions, send Create message then to Controlling PoC media processing units 0, this Controlling PoC media processing units 0 is returned Res message and is given this PoC media control unit.
In the Controlling of Controlling PoC Control Unit PoC Call Control Unit, the Relay control module is responsible for from outside reception message and is transmitted to the Focus control module, and will send to external entity from the message of Focus control module.After the Focus control module receives INVITE, resolve calling and called user profile and cluster group information in this message, determine which called subscriber to set up session by extract policy information from tactful processing module, notify the PoC media control unit that self connects to handle Resources allocation then for these users' medium with; This PoC media control unit is according to the media resource Information Selection Controlling PoC media processing units of self maintained, and sending the Focus media module of Create message to this Controlling PoC media processing units, this Focus media module is divided available media processing resources for current sessions again.Simultaneously, the media strategy information that described tactful processing module also will be relevant with current sessions is sent to media strategy module in the ControllingPoC media processing units by this PoC media control unit.Thereby, when media delivery, the Focus media module can be controlled right to speak, media stream transition and distribution etc. according to the media strategy information of extracting from the media strategy module, medium process module also can be handled indication according to the medium of Focus media module, read in the media strategy module media strategy information to Media Stream duplicate, processing such as code/decode format conversion, rate adapted.
Step 407: in the Controlling PoC Call Control Unit of described Controlling PoC Control Unit, the Focus control unit is according to the called party information in the INVITE that receives, be respectively each called structure INVITE, and will wherein be sent to the affiliated Participating PoC Control Unit 2 of UE2 for the INVITE that UE2 constructed.
Here, described UE2 is one of them called subscriber, described step 407 is to the processing at a called subscriber UE2 of being treated to of step 414, set up process for whole PoC session, the called subscriber has more than one, therefore all will carry out described step 407 to step 414 at each called subscriber.
Step 408～step 409: the PoC media control unit in this Participating PoC Control Unit 2 is according to the media resource information of self preserving, the Participating PoC media processing units of selecting self to connect 2 is handled the Media Stream of current sessions, send Create message then to ParticipatingPoC media processing units 2, this Participating PoC media processing units 2 is returned Res message and is given this PoC media control unit.
Step 410～step 411:Participating PoC Control Unit 2 is transmitted to UE2 with the INVITE that receives, and UE2 accepts current calling, returns the affirmation message of 200OK and gives ParticipatingPoC control unit 2.
Wherein, message transmission/the reception of Participating PoC Control Unit is undertaken by the Relay control module of ParticipatingPoC Call Control Unit wherein, the Relay control module is after receiving INVITE or 200OK message simultaneously, and also the media processing resources that sends H.248 to the PoC media control unit is distributed or media processing resources startup request.Here, described media processing resources is distributed or media processing resources startup request specifically by which kind of message in which kind of agreement is carried, and the present invention does not limit.
Step 412～step 414: after the PoC media control unit in this Participating PoC Control Unit 2 receives media resource startup request, send the media processing resources starting command to Participating PoC media processing units 2, this Participating PoC media processing units 2 echo reply is again given this PoC media control unit; Then, this PoC media control unit returns to Relay control module in this Participating PoC Control Unit 2 with response message, this Relay control module is returned 200 OK message again and is given the Controlling PoC Control Unit, thereby the described INVITE of step 407 is replied.
Here, described media processing resources starting command and replying respectively by the H.248 modification of agreement (Modify) message and Res message is carried, and the present invention does not limit this request and replys specifically and by which kind of message of which kind of agreement carried.
Wherein, the Controlling PoC Call Control Unit in the Controlling PoC Control Unit also will return affirmation (ACK) message to UE2 after receiving 200 OK message, owing to handle no positive connection so not shown with the present invention; In addition, the Focus control module in the described Controlling PoC Call Control Unit will be distributed or media processing resources startup request to the media processing resources that H.248 the PoC media control unit sends after receiving described INVITE or 200 OK message.
After PoC media control unit in step 415～step 417:Controlling PoC Control Unit receives and starts request from the media processing resources of Focus control module, send Modify message to Controlling PoC media processing units 0, this Controlling PoC media processing units 0 is returned Res message again and is given this PoC media control unit; Then, this Controlling PoC Control Unit returns 200 OK message and gives Participating PoC Control Unit 1, thereby the described INVITE of step 404 is replied.
Here, be not that all called subscribers all can accept current calling, participate in current sessions, therefore, the Controlling PoC Control Unit needs to determine that according to the 200 OK message that receive which called subscriber accepts current calling, and with this advisory Controlling PoC media processing units 0, this Controlling PoC media processing units 0 will be prepared the user of these call accepteds is carried out the medium processing.
Step 418～step 419: after the PoC media control unit in this Participating PoC Control Unit 1 receives and starts request from the media processing resources of Relay control module, send Modify message to Participating PoC media processing units 1, this Participating PoC media processing units 1 is returned Res message again and is given this PoC media control unit;
Step 420～step 421:Participating PoC Control Unit 1 returns 200OK message to UE1, the described INVITE of step 401 is replied, UE1 sends ACK message again, sets up process thereby finish current PoC session, can begin media flow transmission.Thereby Media Stream passes through Participating PoC media processing units 1, Controlling PoC media processing units 0 and Participating PoC media processing units 2 successively from UE1, finally arrives UE2 and transmits.
Among the described embodiment of Fig. 4, the node on the pre-configured current sessions media flow transmission of the network path comprises: Participating PoC media processing units 1, Controlling PoC media processing units 0 and Participating PoC media processing units 2.According to the Internet resources configuring condition, the media flow transmission path node that is disposed may not comprise yet: Participating PoC media processing units 1 and/or Participating PoC media processing units 2, but Controlling PoC media processing units 0 must comprise.If do not comprise Participating PoC media processing units 1, then the media flow transmission path is: UE1, Controlling PoC media processing units 0, Participating PoC media processing units 2, UE2, if do not comprise Participating PoC media processing units 2, then the media flow transmission path is: UE1, Participating PoC media processing units 1, Controlling PoC media processing units 0, UE2, if do not comprise Participating PoC media processing units 1 and Participating PoC media processing units 2, then the media flow transmission path is: UE1, Controlling PoC media processing units 0, UE2.This shows that compared with prior art, the present invention can reduce the redundant route of Media Stream in various degree.
In the foregoing description, PoC Control Unit sends the media processing resources assignment commands to the PoC media processing units after receiving INVITE, by the PoC media processing units is that current sessions is divided useable medium processing resource, send media processing resources starting command to the PoC media processing units called after returning 200 OK message, activate the media processing resources of being divided by the PoC media processing units.Similar with this processing thought, the present invention also provides another kind of processing thinking: after PoC Control Unit also can and obtain 200 OK message at the INVITE that receives, send media processing resources assignment commands and media processing resources starting command to the PoC media processing units, divide and activate useable medium by the PoC media processing units and handle resource, the treatment step order of then tackling above-mentioned Fig. 4 adjusts slightly, the concrete processing as shown in Figure 5.
Fig. 5 is another preferred embodiment handling process schematic diagram of the inventive method, and the relation among the figure between each processing entities is described identical with Fig. 4, and concrete the processing comprises:
Step 501～502:UE1 sends INVITE to the Controlling PoC Control Unit by the Participating PoC Control Unit under self 1, this Controlling PoC Control Unit is resolved this INVITE, and constructs INVITE for each called subscriber.
The following stated step 503 to step 510 is the processing at a called subscriber, the present invention is directed to each called subscriber all with execution in step 503 to step 510.
Step 503～step 505:Controlling PoC Control Unit will be sent to UE2 by the Participating PoC Control Unit 2 under the UE2 from the INVITE as the UE2 structure, and UE2 returns 200OK message again and gives Participating PoC Control Unit 2.
Step 506～step 510:Participating PoC Control Unit 2 sends Create message to Participating PoC media processing units 2, and media processing resources is divided in request; After the Res message that obtains Participating PoC media processing units 2, Participating PoC Control Unit 2 sends Modify message to Participating PoC media processing units 2, the media processing resources that requesting activation is divided, this Participating PoC media processing units 2 is returned Res message authentication resource and is activated; Then, Participating PoC Control Unit 2 returns 200 OK message again and gives the ControllingPoC control unit, and the described INVITE of step 503 is replied.
Step 511～step 515:Controlling PoC Control Unit learns that according to the 200 OK message that receive the called subscriber accepts the situation of current calling, send Create message to Controlling PoC media processing units 0 according to this call accepted situation then, media processing resources is divided in request; After the Res message that obtains Controlling PoC media processing units 0, the Controlling PoC Control Unit sends Modify message to Controlling PoC media processing units 0, the media processing resources that requesting activation is divided, this Controlling PoC media processing units 0 is returned Res message authentication resource and is activated; Then, the Controlling PoC Control Unit returns 200 OK message again and gives Participating PoC Control Unit 1, and the described INVITE of step 502 is replied.
Step 516～step 519:Participating PoC Control Unit 1 sends Create message to Participating PoC media processing units 1, and media processing resources is divided in request; After the Res message that obtains Participating PoC media processing units 1, Participating PoC Control Unit 1 sends Modify message to Participating PoC media processing units 1, the media processing resources that requesting activation is divided, this Participating PoC media processing units 1 is returned Res message authentication resource and is activated.
Step 520～step 521:Participating PoC Control Unit 1 returns 200 OK message and gives UE1, the described INVITE of step 501 is replied, UE1 sends ACK message to Participating PoC Control Unit 1 then, confirm that finishing session sets up process, can begin media flow transmission.
After setting up PoC session by said method, can pass through Participating PoC media processing units 1 between UE1 and the UE2, Controlling PoC media processing units 0, Participating PoC media processing units 2 media streams, wherein, Controlling PoC media processing units 0 is responsible for duplicating of Media Stream in the session and is distributed, if except that UE2, also have other called subscriber, just also may have other Participating PoC media processing units, then Controlling PoC media processing units 0 is distributed to each called subscriber with the Media Stream that the duplicated Participating PoC media processing units by each called subscriber's correspondence.
Among the described embodiment of above-mentioned Fig. 4 and Fig. 5, the Participating PoC Call Control Unit 1 under UE1 and the UE2 and the Controlling PoC Call Control Unit of Participating PoC Call Control Unit 2 and current sessions are three different entities.In actual applications, if the PoC Call Control Unit under the UE1 is exactly this Controlling PoC Call Control Unit, then without processing relevant with Participating PoC Control Unit 1 in the execution graph, and UE1 directly is sent to Media Stream Controlling PoC media processing units 0; If the PoC Call Control Unit under the UE2 is exactly a Controlling PoC Call Control Unit, then without processing relevant with Participating PoC Control Unit 2 in the execution graph, and UE2 directly is sent to Media Stream Controlling PoC media processing units 0; Obviously, if UE1 and UE2 all belong to Controlling PoC Call Control Unit, then without processing relevant in the execution graph, and only come media stream between UE1 and the UE2 by Controlling PoC media processing units 0 with Participating PoC Control Unit 1 and Participating PoC Control Unit 2.
That is to say: in the signaling process that session is set up, the method that calling party UE1 sends session foundation request is: if UE1 belongs to Participating PoC Call Control Unit 1, then UE1 is sent to the session request of setting up by this Participating PoC Call Control Unit 1 the Controlling PoC Call Control Unit of current sessions; If UE1 belongs to Controlling PoC Call Control Unit, then UE1 directly is sent to this Controlling PoC Call Control Unit with the session request of setting up.In addition, Controlling PoC Call Control Unit with the method that the session request of setting up of being constructed is distributed to callee UE2 is: if UE2 belongs to Participating PoC Call Control Unit 2, then Controlling PoC Call Control Unit is sent to UE2 by this Participating PoC Call Control Unit 2 with the session request of setting up; If UE2 belongs to Controlling PoC Call Control Unit, then Controlling PoC Call Control Unit directly is sent to UE2 with the session request of setting up.When the PoC session media stream, must come Media Stream is duplicated and distribution etc. focuses on by the Controlling media processing units 0 that Controlling PoC Call Control Unit connects.
Owing to also may have other called subscriber outside UE2, the situation that may occur in session foundation, the media delivery between above-mentioned UE1 and the UE2 is equally applicable to UE1 and other user.Such as: except that described called subscriber UE2, also there is called subscriber UE3, no matter whether the PoC Call Control Unit under UE1 and/or the UE2 is Controlling PoC Call Control Unit, the PoC Call Control Unit under this UE3 may or be the ControllingPoC Call Control Unit for Participating PoC Call Control Unit equally.And, handle the aspects such as configuration of resource, PoC media processing units in session foundation, allocation medium, be directed to the processing of UE3 with at identical with the treatment mechanism of UE2, if that is: UE3 belongs to Participating PoC Call Control Unit, the processing the when processing that then is directed to UE3 belongs to Participating PoC Call Control Unit 2 with above-mentioned UE2 is identical; If UE3 belongs to Controlling PoC Call Control Unit, the processing the when processing that then is directed to UE3 belongs to Controlling PoC Call Control Unit with above-mentioned UE2 is identical, is not repeated in this description at this.
In sum, using PoC network architecture of the present invention and method can separate the control that has PoC Server in the PoC service network now with carrying, and handle respectively by call control layer in the PoC network architecture of the present invention and medium processing layer, also increase media control layer media processing resources is managed concentratedly.The present invention is shared a plurality of processing nodes with original PoC Server to the integrated treatment function of PoC service and is carried out, and being easier to each processing node is the System Expansion reserved resource.Network architecture of the present invention not only makes the transmission path of Media Stream shorten greatly, and media delivery node distribution and signaling process node are relatively independent, the paces of the following PoC service and the NGN network integration have also further been accelerated in the upgrading of easier like this realization systemic-function.
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 (22)

1, a kind of cellular system of realizing the PTT PoC service is characterized in that, this system comprises call control layer, media control layer and medium processing layer; Comprise PoC media processing units in the described medium processing layer greater than one;
Described call control layer is used for the mutual signaling with user terminal UE, sends the media processing resources request for allocation to described media control layer;
Described media control layer is used for the media resource of described medium processing layer is managed, after receiving described media processing resources request for allocation, determine the PoC media processing units that current PoC session uses according to the media resource operating position of current self registered PoC media processing units, and send the media processing resources assignment commands to the described PoC media processing units of determining;
After PoC media processing units in the described medium processing layer receives described media processing resources assignment commands, provide media processing resources according to described media processing resources assignment commands for current PoC session, and be the UE media stream in the current PoC session group.
2, system according to claim 1 is characterized in that, described call control layer is made up of one or more PoC Call Control Unit;
Described PoC Call Control Unit with the mutual call signaling of UE, sends the media processing resources request for allocation to described media control layer.
3, system according to claim 2, it is characterized in that, in one or more PoC Call Control Unit of described composition call control layer, have a PoC Call Control Unit at least as the control PoC Call Control Unit in the PoC session, this control PoC Call Control Unit comprises:
The relay and control module receives from the call signaling of UE and is forwarded to centralized control module, will be distributed to UE from the call signaling of centralized control module;
Centralized control module, according to from the call signaling of relay and control module from tactful processing module fetch strategy information, and according to this policy information structure call signaling and export the relay and control module to, send the media processing resources request for allocation to media control layer, media control layer sends the media processing resources assignment commands to the PoC media processing units;
The strategy processing module receives policy information and preservation from external entity, and the media strategy information in this policy information is sent to the PoC media processing units.
4, system according to claim 3 is characterized in that, is control PoC media processing units from the PoC media processing units of described media control layer receiving media processing resource allocation order, and this control PoC media processing units comprises:
The relay media module receives from the Media Stream of UE and is forwarded to the centralized media module, will be distributed to UE from the Media Stream of centralized media module;
The centralized media module, reception is from the media processing resources assignment commands of described media control layer, distribute and the startup media processing resources, to be forwarded to medium process module from the Media Stream of relay media module, extract media strategy information according to Media Stream from the media strategy module from the relay media module, and press these media strategy information transmission medium and handle indication to medium process module, will be sent to the relay media module from the Media Stream of medium process module;
The media strategy module receives described media strategy information from described tactful processing module and preserves;
Medium process module is handled indication according to described medium and is extracted media strategy information from the media strategy module, and by this media strategy information to handling from the Media Stream of centralized media module, the Media Stream after will handling again is sent to the centralized media module.
5, system according to claim 3, it is characterized in that, when described call control layer is made up of an above PoC Call Control Unit, in this above PoC Call Control Unit, except that described control PoC Call Control Unit, also have a PoC Call Control Unit at least as the participation PoC Call Control Unit in the PoC session, this participation PoC Call Control Unit comprises:
The relay and control module, reception is from the call signaling of control PoC Call Control Unit in UE or the current PoC session,, and determine call signaling is forwarded to control PoC Call Control Unit or UE in the current PoC session from tactful processing module fetch strategy information according to this call signaling according to this policy information;
The strategy processing module receives policy information from external entity and preserves.
6, system according to claim 5, it is characterized in that, in the described participation PoC Call Control Unit: described relay and control module further sends the media processing resources request for allocation to described media control layer, and described media control layer sends the media processing resources order to the PoC media processing units; Described tactful processing module further is sent to the PoC media processing units with the media strategy information in the policy information of being preserved.
7, system according to claim 6 is characterized in that, for participating in the PoC media processing units, this participation PoC media processing units comprises from the PoC media processing units of described media control layer receiving media processing resource allocation order:
The relay media module, reception is from the media processing resources assignment commands of described media control layer, distribute and the startup media processing resources, the Media Stream of the PoC media processing units that reception is connected from UE or control PoC Call Control Unit also is forwarded to medium process module, from the media strategy module, extract media strategy information according to this Media Stream, send medium by this media strategy information and handle indication, will export PoC media processing units or UE that control PoC Call Control Unit is connected to from the Media Stream of medium process module to medium process module;
The media strategy module, the tactful processing module receiving media policy information from described participation PoC Call Control Unit is also preserved;
Medium process module is handled indication according to described medium and is extracted media strategy information from the media strategy module, and to handling from the Media Stream of relay media module, the Media Stream after will handling again is sent to the relay media module by this media strategy information.
8, system according to claim 2 is characterized in that, described media control layer is made up of one or more PoC media control unit;
Described PoC media control unit, after being used to receive media processing resources request for allocation from the PoC Call Control Unit, be identified for transmitting the PoC media processing units of current PoC session Media Stream according to the media resource operating position of current self registered PoC media processing units, and send the media processing resources assignment commands to determined PoC media processing units.
9, system according to claim 8, it is characterized in that, form in one or more PoC Call Control Unit of call control layer, have a PoC Call Control Unit at least as the control PoC Call Control Unit in the PoC session, this control PoC Call Control Unit comprises:
The relay and control module receives from the call signaling of UE and is forwarded to centralized control module, will be distributed to UE from the call signaling of centralized control module;
Centralized control module, according to from the call signaling of relay and control module from tactful processing module fetch strategy information, and according to this policy information structure call signaling and export the relay and control module to, send the media processing resources request for allocation to the PoC media control unit that self connects;
The strategy processing module receives policy information and preservation from external entity, and the media strategy information in this policy information is sent to the PoC media processing units by the PoC media control unit that self connects.
10, system according to claim 9 is characterized in that, described reception is a control PoC media processing units by the PoC media processing units of the media processing resources assignment commands that the PoC media control unit sends, and this control PoC media processing units comprises:
The relay media module receives from the Media Stream of UE and is forwarded to the centralized media module, will be distributed to UE from the Media Stream of centralized media module;
The centralized media module, reception is from the media processing resources assignment commands of PoC media control unit, distribute and the startup media processing resources, to be forwarded to medium process module from the Media Stream of relay media module, extract media strategy information according to Media Stream from the media strategy module from the relay media module, and press these media strategy information transmission medium and handle indication to medium process module, will be sent to the relay media module from the Media Stream of medium process module;
The media strategy module receives described media strategy information from described PoC media control unit and preserves;
Medium process module is handled indication according to described medium and is extracted media strategy information from the media strategy module, and by this media strategy information to handling from the Media Stream of centralized media module, the Media Stream after will handling again is sent to the centralized media module.
11, system according to claim 9, it is characterized in that, when described call control layer is made up of an above PoC Call Control Unit, in this above PoC Call Control Unit, except that described control PoC Call Control Unit, also have a PoC Call Control Unit at least as the participation PoC Call Control Unit in the PoC session, this participation PoC Call Control Unit comprises:
The relay and control module, reception is from the call signaling of control PoC Call Control Unit in UE or the current PoC session,, and determine call signaling is forwarded to control PoC Call Control Unit or UE in the current PoC session from tactful processing module fetch strategy information according to this call signaling according to this policy information;
The strategy processing module receives policy information from external entity and preserves.
12, system according to claim 11 is characterized in that, in the described participation PoC Call Control Unit: described relay and control module further sends the media processing resources request for allocation to the PoC media control unit that self connects; Described tactful processing module further is sent to the PoC media processing units with the media strategy information in the policy information of being preserved by this PoC media control unit.
13, system according to claim 12 is characterized in that, described reception is to participate in the PoC media processing units by the PoC media processing units of the media processing resources assignment commands that the PoC media control unit sends, and this participation PoC media processing units comprises:
The relay media module, reception is from the media processing resources assignment commands of PoC media control unit, distribute and the startup media processing resources, the Media Stream of the PoC media processing units that reception is connected from UE or control PoC Call Control Unit also is forwarded to medium process module, from the media strategy module, extract media strategy information according to this Media Stream, send medium by this media strategy information and handle indication, will export PoC media processing units or UE that control PoC Call Control Unit is connected to from the Media Stream of medium process module to medium process module;
The media strategy module is from described PoC media control unit receiving media policy information and preservation;
Medium process module is handled indication according to described medium and is extracted media strategy information from the media strategy module, and to handling from the Media Stream of relay media module, the Media Stream after will handling again is sent to the relay media module by this media strategy information.
According to claim 3,4,5,6,7,9,10,11,12 or 13 described systems, it is characterized in that 14, described control PoC Call Control Unit further comprises:
Notification handler module from external entity reception notification information, from described tactful processing module fetch strategy information, and is distributed to UE by this policy information with announcement information according to this announcement information.
According to claim 5,6,7,11,12 or 13 described systems, it is characterized in that 15, described participation PoC Call Control Unit further comprises:
Notification handler module from control PoC Call Control Unit reception notification information, from described tactful processing module fetch strategy information, and is determined the information of issuing a notice to UE according to this policy information according to this announcement information.
16, a kind of method that realizes PoC service, this method is applied to comprise in the network architecture of call control layer, media control layer and medium processing layer, described call control layer is made up of the PoC Call Control Unit, described media control layer is made up of the PoC media control unit, described medium processing layer is made up of the PoC media processing units greater than, it is characterized in that this method comprises:
A. calling party UE sends session foundation and asks the Call Control Unit to PoC;
The B.PoC Call Control Unit is set up request structure media processing resources request for allocation according to this session, and is each callee UE structure session foundation request of current sessions; The session request of setting up of being constructed is distributed to each callee UE, the media processing resources request for allocation of being constructed is sent to the PoC media control unit that is connected; After the PoC media control unit receives the media processing resources request for allocation, determine the PoC media processing units that current PoC session uses according to the media resource operating position of current self registered PoC media processing units, and send the media processing resources assignment commands to the described PoC media processing units of determining; This PoC media processing units is handled resource according to this media processing resources assignment commands allocation medium;
C. calling party and callee's UE is by the PoC media processing units media stream on the media delivery path.
17, method according to claim 16 is characterized in that, same PoC Call Control Unit under described calling party UE and each the callee UE, and be the control PoC Call Control Unit of current sessions.
18, method according to claim 16 is characterized in that, in the steps A, described PoC Call Control Unit is a PoC Call Control Unit under the calling party UE, and is the control PoC Call Control Unit of current sessions;
Among the step B, the PoC Call Control Unit that request and media processing resources request for allocation are set up in described structure session is the described control of a steps A PoC Call Control Unit;
The participation PoC Call Control Unit that in the PoC Call Control Unit under each callee UE one or more PoC Call Control Unit to be arranged be current sessions;
Other PoC Call Control Unit in the PoC Call Control Unit under each callee UE except that described participation PoC Call Control Unit is the described control of a steps A PoC Call Control Unit;
Described control PoC Call Control Unit with the method that the session request of setting up of being constructed is distributed to each callee UE is:
When the PoC Call Control Unit under the callee UE was participation PoC Call Control Unit, the described control of steps A PoC Call Control Unit was sent to this callee UE by this participation PoC Call Control Unit with the session request of setting up;
When the PoC Call Control Unit under the callee UE was the described control of steps A PoC Call Control Unit, this control PoC Call Control Unit directly was sent to this callee UE with the session request of setting up.
19, method according to claim 16 is characterized in that, the PoC Call Control Unit under the calling party UE is the participation PoC Call Control Unit of current sessions;
In the steps A, the method that described calling party UE sends session foundation request is: calling party UE is sent to the session request of setting up that receives by current participation PoC Call Control Unit the control PoC Call Control Unit of current sessions;
Among the step B, described PoC Call Control Unit is current control PoC Call Control Unit, and the PoC Call Control Unit under each UE of described callee is this control PoC Call Control Unit.
20, method according to claim 16 is characterized in that, the PoC Call Control Unit under the described calling party UE is the participation PoC Call Control Unit of current sessions;
In the steps A, the method that described calling party UE sends session foundation request is: calling party UE is sent to the session request of setting up that receives by current participation PoC Call Control Unit the control PoC Call Control Unit of current sessions;
Among the step B, the PoC Call Control Unit that request and media processing resources request for allocation are set up in described structure session is current control PoC Call Control Unit;
The participation PoC Call Control Unit that in the PoC Call Control Unit under each callee UE one or more PoC Call Control Unit to be arranged be current sessions;
Other PoC Call Control Unit in the PoC Call Control Unit under each callee UE except that described participation PoC Call Control Unit is current control PoC Call Control Unit;
Described control PoC Call Control Unit with the method that the session request of setting up of being constructed is distributed to each callee UE is:
When the PoC Call Control Unit under the callee UE was participation PoC Call Control Unit, current control PoC Call Control Unit was sent to this callee UE by this participation PoC Call Control Unit with the session request of setting up;
When the PoC Call Control Unit under the callee UE was current control PoC Call Control Unit, this control PoC Call Control Unit directly was sent to this callee UE with the session request of setting up.
According to each described method of claim 17 to 20, it is characterized in that 21, among the step B, the method that described PoC media processing units is handled resource according to this media processing resources assignment commands allocation medium is:
Described control PoC Call Control Unit is after receiving session foundation request and before request is set up in the transmission session, structure media processing resources request for allocation also sends to described PoC media control unit, described PoC media control unit sends the media processing resources assignment commands to described PoC media processing units, and this PoC media processing units is that current sessions is divided useable medium processing resource according to this media processing resources assignment commands; This control PoC Call Control Unit is after the response message that receives the session foundation request that self has sent, send media processing resources and start request to the PoC media control unit, the PoC media control unit sends the media processing resources starting command to this PoC media processing units, and this PoC media processing units activates the useable medium of self having divided and handles resource; Perhaps,
Described control PoC Call Control Unit is after the response message that receives the session foundation request that self has sent, set up request structure media processing resources request for allocation and media processing resources startup request and send to the PoC media control unit according to this session, PoC media control unit transmission media processing resources assignment commands and media processing resources starting command are to described PoC media processing units, and this PoC media processing units is that useable medium processing resource is divided and activated to current sessions.
According to each described method of claim 17 to 20, it is characterized in that 22, among the step C, described PoC media processing units is the PoC media processing units that described control PoC Call Control Unit is managed.
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