CN1326412C - Method for selecting media-flow carrying path - Google Patents
Method for selecting media-flow carrying path Download PDFInfo
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- CN1326412C CN1326412C CNB2004100455817A CN200410045581A CN1326412C CN 1326412 C CN1326412 C CN 1326412C CN B2004100455817 A CNB2004100455817 A CN B2004100455817A CN 200410045581 A CN200410045581 A CN 200410045581A CN 1326412 C CN1326412 C CN 1326412C
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Abstract
The present invention provides a selection method for a medium stream carrying path. The present invention comprises that a user terminal judges whether a called party to be called belongs to an accessed network which the called party is on or not, and if truth, the called party continues to access the network, else the access of the network is ended. The user terminal judges whether the grouping connection through an access network gateway GPRS supporting node exists or not, and if truth, the existing grouping connection or the other activated grouping connection through the access network gateway GPRS supporting node is used as the medium stream carrying path, else the activated grouping connection through the access network gateway GPRS supporting node is used as the medium stream carrying path. The user terminal uses the medium stream carrying path and the called party to carry out medium stream interaction. The present invention can reduce the transmission time delay of a medium stream and simultaneously lower the transmission fault rate of the medium stream.
Description
Technical field
The present invention relates to the mobile multimedia communication technical field, relate in particular to the system of selection in a kind of media stream bearing path.
Background technology
Along with the continuous development of mobile multimedia communication technology, mobile IP multimedia communication service has occupied more and more important position.Mobile IP multimedia communication service mainly realizes that by IP Multimedia System (IMS, IP Multimedia Subsystem) and packet domain subsystem (PS, Packet Subsystem) wherein IMS is used to control the whole process of mobile IP multimedia communication; And mutual Media Stream all is to carry by PS between IMS control signaling and the user.
In IP Multimedia System IMS, mainly comprise following functional entity:
Call state controlled entity (CSCF, Call State Control Function) is a topmost functional entity among the IMS;
Agent call State Control entity (P-CSCF, Proxy-Call State Control Function), be subscriber equipment (UE, User Equipment) message of Fa Songing first contact point in IMS, be used to finish agent functionality, receive initial session protocol (SIP, the Session InitiationProtocol) message of UE transmission and carry out inter-process as far as possible, and then the sip message after will handling is transmitted processing;
Query call State Control entity (I-CSCF, Interrogating Call State Control Function), being mainly used in the network security aspect handles, finish network concealed function, I-CSCF inquired about and is defined as this user according to user profile when the user registered provides the service call State Control entity of service (S-CSCF, Serving-Call State Control Function);
S-CSCF notes user's call state, finishes this user's CCF, and S-CSCF is a topmost operation controlling entity among the IMS, and different S-CSCF is owing to the application server difference that is connected, and the service control function of finishing is also different.
With reference to Fig. 1, this figure is that UE uses the GGSN visit of accesses network to provide the process schematic diagram of the S-CSCF of service for it in the prior art; When mobile UE10 roams into accesses network 1, Gateway GPRS Support Node (the GGSN of accesses network 1 will be used, Gateway GPRS Support Node) 11 transmits the P-CSCF12 of IMS control signaling to accesses network 1, transmit S-CSCF20 in the home network 2 of this UE10 of IMS control signaling by the P-CSCF12 of accesses network 1 then, the S-CSCF20 in the home network 2 provides IMS business according to the IMS control signaling that receives for this UE10.
With reference to Fig. 2, this figure is that UE uses the GGSN visit of home network to provide the process schematic diagram of the S-CSCF of service for it in the prior art; When mobile UE10 roams into accesses network 1, use the GGSN11 in the network of self home 2 to transmit IMS control signaling to the P-CSCF12 in the home network 2, and then transmit IMS by P-CSCF12 and control signaling to the S-CSCF20 in the home network 2, S-CSCF20 provides IMS business according to the IMS control signaling that receives for this UE10.
And user terminal UE and the P-CSCF of home network between carry out mutual IMS control signaling before, at first to set up block data protocol context (the PDP Context of UE and network side, Packet DataProtoco1 context) connects, to be used for carrying IMS control signaling and the medium stream information between UE and the P-CSCF.Wherein by the serving GPRS support node (SGSN of UE to network side, Serving GPRSSupport Node) carries the APN (APN that UE initiatively selects in the activation PDP Context request message of Fa Songing, Access Point Name), the GPRS of network side calculates to determine to use the GGSN of accesses network to connect P-CSCF according to the APN that UE is sent, and also is to use the GGSN of home network to connect P-CSCF.
And,, also might use the GGSN of home network to connect P-CSCF so just may cause network side may use the GGSN of accesses network to connect P-CSCF because UE is that self initiatively chooses to the APN that the GPRS of network side sends.
With reference to Fig. 3, this figure uses the GGSN of home network to communicate mutual Media Stream to handle schematic diagram between the entity of UE and accesses network in the prior art; If when using the GGSN of home network to connect P-CSCF, when UE conducts interviews to the entity in the accesses network 13, the Media Stream that UE sends at first will arrive the GGSN11 of home network 2, and then is fed back to the entity 13 in the accesses network of accesses network 1 by GGSN11.
With reference to Fig. 4, this figure uses the GGSN of accesses network to communicate mutual Media Stream to handle schematic diagram between the entity of UE and accesses network in the prior art; When UE conducted interviews to the entity in the accesses network 13, the Media Stream that UE sends directly arrived the GGSN11 of accesses network 1, fed back to entity 13 in the accesses network by the GGSN11 of accesses network 1 again.
This shows, if use PDP Context path by the GGSN foundation of home network, there is the circuitous problem in path in mutual Media Stream between the entity in UE and the accesses network, and the circuitous transmission bandwidth of not only can wasting in this path, and simultaneously may also can be different owing to the IP address assignment scheme of accesses network and home network, cause when carrying out interactive media stream between the entity in UE and the accesses network, need carry out that network address translation is handled or the protocol conversion process of borde gateway equipment etc. to Media Stream, thereby can cause the time-delay of media flow transmission, also can increase the transmission fault rate of Media Stream.And if when requiring UE to use between PDP Context path that the GGSN of accesses network sets up and the entity in the accesses network interactive media stream, then can avoid above-mentioned these problems.
Summary of the invention
The technical problem to be solved in the present invention is the system of selection that proposes a kind of media stream bearing path, so that user terminal can use interactive media stream between Gateway GPRS Support Node in the accesses network and the entity in the accesses network, to avoid the circuitous of media stream bearing path.
For addressing the above problem, the present invention proposes the system of selection in a kind of media stream bearing path, comprise step:
(1) user terminal judges whether the callee who will call out belongs to the accesses network at self place, if continue step (2); Otherwise finish;
(2) user terminal judges whether to exist the grouping through the accesses network Gateway GPRS Support Node to connect, if the grouping connection of described existence or the grouping that utilizes active information to activate in addition through the accesses network Gateway GPRS Support Node are connected as the media stream bearing path; Otherwise the grouping that utilizes active information to activate through the accesses network Gateway GPRS Support Node connects as the media stream bearing path;
(3) user terminal will be used to indicate and self send the callee to based on the information of the address in described media stream bearing path;
(4) to utilize described media stream bearing path and callee to carry out Media Stream mutual for user terminal.
User terminal is judged according to callee's user totem information or address information in the wherein said step (1).
User terminal is judged according to the corresponding APN of grouping connection of described existence in the wherein said step (2); Or
Address information according to the corresponding Gateway GPRS Support Node of the grouping connection of described existence is judged.
The process that wherein activates the grouping connection described in the step (2) further comprises:
User terminal sends the serving GPRS support node of the activation request message of the APN that comprises corresponding accesses network Gateway GPRS Support Node to the visit network;
The serving GPRS support node of accesses network obtains the address information of accesses network Gateway GPRS Support Node by the APN that receives is resolved; And
The grouping of setting up through the accesses network Gateway GPRS Support Node connects.
In addition, activating the process of dividing into groups to connect described in the step (2) can further include:
Serving GPRS Support Node is provided with the APN of self network gateway GPRS Support Node correspondence;
User terminal sends and activates the Serving GPRS Support Node of request message to the visit network;
The Serving GPRS Support Node of accesses network is resolved the address information that obtains the accesses network Gateway GPRS Support Node to the APN that is provided with after receiving and activating request message; And
The grouping of setting up through the accesses network Gateway GPRS Support Node connects.
It is wherein said that to be used to indicate self be the IP address information based on the information of the address in described media stream bearing path.
Wherein said callee is called user terminal or is application server.
The system of selection in media stream bearing of the present invention path the callee that accesses network was wanted and belonged to user terminal carry out Media Stream mutual before, at first judge whether to exist the grouping connection through accesses network GGSN to exist by user terminal, the grouping of using already present grouping connection or other to activate process accesses network GGSN when existing connects as the media stream bearing path; And when not existing, the grouping that activates through accesses network GGSN connects as the media stream bearing path; To carry out Media Stream through the grouping connection of accesses network GGSN and callee mutual so that user terminal always is to use.Thereby avoided therefore having reduced the transmission delay of Media Stream, reduced the transmission fault rate of Media Stream simultaneously owing to the media stream bearing path of using grouping through user terminal home network GGSN to connect to carry out Media Stream to cause alternately is circuitous.
Description of drawings
Fig. 1 is that UE uses the GGSN visit of accesses network to provide the process schematic diagram of the S-CSCF of service for it in the prior art;
Fig. 2 is that UE uses the GGSN visit of home network to provide the process schematic diagram of the S-CSCF of service for it in the prior art;
Fig. 3 uses the GGSN of home network to communicate mutual Media Stream to handle schematic diagram between the entity of UE and accesses network in the prior art;
Fig. 4 uses the GGSN of accesses network to communicate mutual Media Stream to handle schematic diagram between the entity of UE and accesses network in the prior art;
Fig. 5 activates the processing procedure schematic diagram by the PDP Context that user terminal is initiated;
Fig. 6 is the specific embodiment process chart of the system of selection in media stream bearing of the present invention path.
Embodiment
In the 2.G mobile communication system or in the 3G mobile communication system, use GPRS (GPRS, when General Packet Radio Service) network carries out mobile IP multimedia communication, by user terminal (UE, User Equipment) activation block data protocol context (the PDP Context of Fa Qiing, Packet Data Protocol context) process belongs to standard technique to describe in standard.Wherein preserve user's face in the PDP Context information and carried out all information that the tunnel is transmitted, also comprised user's face IP address, Tunnel Identifier and the service quality Q OS etc. of radio network controller (RNC, Radio Network Controller)/GGSN.And PDP Context can carry medium stream information mutual between the user; Also can carry the control signaling information between user terminal UE and the network side.
For the system of selection that makes media stream bearing of the present invention path illustrates more perfectly and clear, at first briefly introduce the PDP Context activation of initiating by UE here.With reference to Fig. 5, this figure activates the processing procedure schematic diagram by the PDP Context that user terminal is initiated; Specific as follows by the PDPContext activation that user terminal UE initiates:
Step S1, UE send by wireless access network UTRAN and activate the Serving GPRS Support Node (SGSN, ServingGPRS Support Node) of request message Activate PDPContext Requested to the GPRS network side; Wherein include PDP Type information, PDP Type address information, APN APN and QOS Requested information etc. among the activation request message Activate PDP ContextRequested of Fa Songing.
Step S2, SGSN obtain the APN APN that comprises among the activation request message Activate PDP Context Requested of reception, and the APN that obtains is carried out address resolution, obtain the GGSN address information of this APN correspondence; And the GGSN address information that obtains according to parsing sends to this GGSN and creates PDP Context request message Create PDP Context Request; Wherein SGSN carries out address resolution to APN, may obtain the GGSN address information in this UE home network, also might obtain the GGSN address information in this UE accesses network;
Step S3, after GGSN receives and creates PDP Context request message Create PDP ContextRequest, PDP Context distribution address for the user, and the transmission of the SGSN in step S2 establishment PDP Context response message, wherein mainly comprise PDP ADDRESS information, GGSN ADDRESS information and the UE IP address information on the PDPContext of this activation etc. in the establishment PDP Context response message of SGSN feedback;
After step S4, SGSN receive and create PDP Context response message, send activation response message Activate PDP Context Accept to user terminal; Wherein activate and also consist predominantly of PDP ADDRESS information, GGSN ADDRESS information and the UE IP address information on the PDP of this activation Context etc. among the response message Activate PDPContext Aceept; Activation request process to this user terminal UE is finished, and UE has set up PDP Context with network side and has been connected;
Step S5, the subsequent user terminal UE just can use above-mentioned activation PDP Context to connect to come carrying media stream information or control signaling information as one in GPRS network grouping.
Wherein carry out between user terminal UE and the callee Media Stream when mutual or and network side when controlling Signalling exchange, can use same PDP Context grouping to connect; Also can use different PDPContext groupings to connect to come carrying media stream and control signaling respectively; And UE can use the PDP Context grouping of a plurality of activation to connect to carry and the callee between mutual Media Stream.
Specify the concrete enforcement link of the system of selection in media stream bearing of the present invention path below, with reference to Fig. 6, this figure is the specific embodiment process chart of the system of selection in media stream bearing of the present invention path.Wherein before the system of selection in media stream bearing of the present invention path is carried out, may have following state between user terminal and the network: user terminal UE has activated a PDP Context grouping and has connected, to be used as the bearer path of communication starting stage control signaling, wherein UE activates the process of PDP Context grouping connection with reference to foregoing description; The PDPContext grouping that is used for bearer control signalling that wherein this has activated connects may be by the GGSN of this UE home network, the also GGSN in the network that might visit at present by this UE, network side selects the GGSN of which network to send entrained APN information in this activation PDP Context request message according to this UE.
Under the situation of existing network framework, signaling and business processing flow, user terminal UE for and belong to mutual Media Stream between the callee of self accesses network of living in to set up the main process in optimum media stream bearing path as follows:
Step S10, this UE judge whether the callee that self will call out belongs to the accesses network at self place; Wherein UE can judge according to callee's user totem information or address information; Can learn the network system information that the callee is affiliated as UE by identification callee's user totem information (as domain name xxx@sina.com) or callee's number information; If, execution in step S20; Otherwise the selection that finishes this media stream bearing path is handled.
Step S20, this UE judge whether to exist the PDP Context grouping through accesses network GGSN to connect; Wherein this UE can judge according to the pairing APN APN of this PDP Context that has existed grouping connection; Also can connect pairing GGSN address information according to this PDP Context that has existed grouping judges; If judge that drawing the PDP Context grouping that exists through accesses network GGSN connects execution in step S30; If there is no the PDPContext grouping through accesses network GGSN connects, then execution in step S40.
Step S30, this UE utilize the PDP Context grouping of the process accesses network GGSN that has existed to connect, and are used as the media stream bearing path; Also can activate in addition PDPContext grouping through accesses network GGSN and connect that to be used as the media stream bearing path (be that user terminal UE and accesses network side at least once activate PDP Context request again and handle, connect to set up at least one PDP Context grouping, to be used for carrying Media Stream mutual between the calling and called).
Step S40, the PDP Context grouping that this UE activates through accesses network GGSN connects, being used as the media stream bearing path (is that user terminal UE and accesses network side at least once activate PDPContext request processing again, connect to set up at least one PDP Context grouping, to be used for carrying Media Stream mutual between the calling and called).
Wherein among step S30 and the step S40, the APN parameter that UE comprises in the activation PDP Context request message that accesses network sends can determine accesses network to use the GGSN of accesses network also to be to use the GGSN of home network, therefore user terminal can be by choosing the APN corresponding with accesses network GGSN, and the APN that chooses is encapsulated into to activate sends to accesses network in the PDP Context request message and get final product;
If user terminal UE does not understand the APN information of accesses network, then can in the activation PDP context request message that sends to accesses network, not carry the APN parameter, but obtain the APN request (the APN parameter is the part of user signing contract information) of accesses network by the SGSN of accesses network according to user's CAMEL-Subscription-Information in advance; Perhaps network side uses default APN parameter, and that default APN parameter correspondence is the GGSN of user terminal access network among the general SGSN.SGSN in the accesses network resolves the GGSN address information that can obtain in the accesses network by APN, can activate new PDP context grouping then by the GGSN of UE place accesses network and connect, to be used as the media stream bearing path.
Step S50, UE with self based on newly-established media stream bearing path the IP address send to callee's (because the PDP context of corresponding each activation grouping connects, user terminal UE can be assigned to different IP addresses).
Step S60, in the accesses network at this UE place, this user terminal UE utilizes among step S30 or the step S40 formed media stream bearing path to come that to carry out Media Stream mutual with the callee.
When the user roams into other accesses network, and with this accesses network in callee's (possible called user terminal, also may be the application server in the accesses network) when communicating, after the principle that the system of selection in employing the invention described above media stream bearing path is narrated, can be implemented in that to carry out Media Stream in the accesses network mutual, and do not need home network by user terminal, avoided the circuitous phenomenon in media flow transmission path, bring optimum media stream bearing path, saved the transmitted in packets bandwidth greatly.Correspondingly, also just avoided because the IP address assignment scheme of accesses network and home network may be different, and when carrying out media communication between two networks that cause, work such as the network address conversion processing that need carry out or Border Gateway Protocol conversion processing, therefore reduce the propagation delay time of Media Stream, and reduced the incidence of transmission fault.So the system of selection in media stream bearing of the present invention path will bring great improvement for voice communication service and some multimedia data communication business that real-time is had relatively high expectations.
Explanation by the front it will be apparent to those skilled in the art that, can also make various variations within the scope of the invention.Though described a preferred embodiment of the present invention in detail, obviously the present invention also has many variations and change in the scope that claims are put down in writing.
Claims (7)
1, the system of selection in a kind of media stream bearing path is characterized in that, comprises step:
(1) user terminal judges whether the callee who will call out belongs to the accesses network at self place, if continue step (2); Otherwise finish;
(2) user terminal judges whether to exist the grouping through the accesses network Gateway GPRS Support Node to connect, if the grouping connection of described existence or the grouping that utilizes active information to activate in addition through the accesses network Gateway GPRS Support Node are connected as the media stream bearing path; Otherwise the grouping that utilizes active information to activate through the accesses network Gateway GPRS Support Node connects as the media stream bearing path;
(3) user terminal will be used to indicate and self send the callee to based on the information of the address in described media stream bearing path;
(4) to utilize described media stream bearing path and callee to carry out Media Stream mutual for user terminal.
2, the system of selection in media stream bearing according to claim 1 path is characterized in that, user terminal is judged according to callee's user totem information or address information in the described step (1).
3, the system of selection in media stream bearing according to claim 1 path is characterized in that,
User terminal is judged according to the corresponding APN of grouping connection of described existence in the described step (2); Or
Address information according to the corresponding Gateway GPRS Support Node of the grouping connection of described existence is judged.
4, the system of selection in media stream bearing according to claim 1 path is characterized in that, utilizes active information to activate the process that grouping connects described in the step (2) and further comprises:
User terminal sends the serving GPRS support node of the activation request message of the APN that comprises corresponding accesses network Gateway GPRS Support Node to the visit network;
The serving GPRS support node of accesses network obtains the address information of accesses network Gateway GPRS Support Node by the APN that receives is resolved; And
The grouping of setting up through the accesses network Gateway GPRS Support Node connects.
5, the system of selection in media stream bearing according to claim 1 path is characterized in that, utilizes active information to activate the process that grouping connects described in the step (2) and further comprises:
Serving GPRS Support Node is provided with the APN of self network gateway GPRS Support Node correspondence;
User terminal sends and activates the Serving GPRS Support Node of request message to the visit network;
The Serving GPRS Support Node of accesses network is resolved the address information that obtains the accesses network Gateway GPRS Support Node to the APN that is provided with after receiving and activating request message; And
The grouping of setting up through the accesses network Gateway GPRS Support Node connects.
6, the system of selection in media stream bearing according to claim 1 path is characterized in that, described to be used to indicate self be the IP address information based on the information of the address in described media stream bearing path.
According to the system of selection in claim 1,2 or 6 described media stream bearing paths, it is characterized in that 7, described callee is called user terminal or is application server.
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| CNB2004100455817A CN1326412C (en) | 2004-06-07 | 2004-06-07 | Method for selecting media-flow carrying path |
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| CNB2004100455817A CN1326412C (en) | 2004-06-07 | 2004-06-07 | Method for selecting media-flow carrying path |
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| CN1326412C true CN1326412C (en) | 2007-07-11 |
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| CN101388828B (en) * | 2007-09-10 | 2011-07-13 | 电信科学技术研究院 | Method and device for bearing activation by evolution packet switching system |
| CN101394580B (en) * | 2007-09-21 | 2012-01-25 | 电信科学技术研究院 | Method, apparatus, MME and communication system for EPS bearing management |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996003831A1 (en) * | 1994-07-26 | 1996-02-08 | Motorola Inc. | System, method and multipoint control unit for multipoint multimedia conferencing |
| KR20030047102A (en) * | 2001-12-07 | 2003-06-18 | 삼성전자주식회사 | Method for selecting the optimal ggsn by sgsn in gprs |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996003831A1 (en) * | 1994-07-26 | 1996-02-08 | Motorola Inc. | System, method and multipoint control unit for multipoint multimedia conferencing |
| KR20030047102A (en) * | 2001-12-07 | 2003-06-18 | 삼성전자주식회사 | Method for selecting the optimal ggsn by sgsn in gprs |
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