CN102055745B - Signaling gateway and processing method of media path optimization thereof - Google Patents
Signaling gateway and processing method of media path optimization thereof Download PDFInfo
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- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
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Abstract
The invention discloses a signaling gateway and a processing method of media path optimization thereof. The method comprises: the signaling gateway adds node information containing coder and decoder information to a forwarded SDP (signal data processor) request when the SDP request is received and forwarded; and when an SDP response is received, if the SDP response has no node information or has invalid node information, signaling gateway judges whether an addressable domain exists according to zero or one or more node information in the received SDP request, if the addressable domain exists,whether the selected coder information is in a coder and decoder list is judged, and if the selected code information is in the coder and decoder list, the node information is contained in the forwarded SDP response when the SDP response is forwarded. In the invention, through adding the node information containing coder and decoder information in the SDP request, the signaling gateway can acquire a complete coder and decoder list, the incorrect judgment problem of the coder and decoder information in the prior art is solved, and the processing method of the media path optimization of the signaling gateway is easy to realize.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to the processing method of a kind of SGW and optimization media path thereof.
Background technology
IP Multimedia System (IP Multimedia Core Network Subsystem, abbreviate IMS as) be by third generation partner program (3rd Generation Partnership Proiect, abbreviation 3GPP) a kind of IP-based network framework that proposes, this system constructing a kind of opening and service environment flexibly, support multimedia application, can provide abundant multimedia service for the user.
IMS can be divided into key-course and operation layer, wherein, key-course mainly comprises conversation control function (the Call Session Control Function that triggers and control for business, abbreviate CSCF as), and CSCF can be divided into proxy CSCF (Proxy CSCF abbreviates P-CSCF as), inquiry CSCF (Interrogating CSCF, abbreviate I-CSCF as) and serving CSCF (Serving CSCF, abbreviate S-CSCF as), wherein, I-CSCF and S-CSCF are optional.And operation layer mainly comprises a series of application server (Application Server abbreviates AS as), and being used for providing concrete service business, AS can be entity independently, also may reside among the S-CSCF.Its operational mode is: key-course (S-CSCF) calls the business on the AS according to user's professional triggering of CAMEL-Subscription-Information control, realizes business function.
Simultaneously, the gateway device that also has various processing IMS signalings and medium in the IMS network, access control gateway (Access Gateway such as P-CSCF and control thereof, abbreviate AGW as), mutual boundary Control function (Interworking Border Control Function, abbreviate I-BCF as) and control mutual borde gateway (Interworking Border Gateway, abbreviate I-BGW as), session border control (the Session Border Control of signaling and media gateway unification, abbreviate SBC as), ALG (Application Layer Gateway, abbreviate ALG as) and control transport gateway (Transmit Gateway, be called for short TrGW) etc., the effect of these gateways mainly is that media path is carried out segmentation, thereby the intercommunication between the realization heterogeneous networks, such as the intercommunication between public network equipment and private network device, also has the intercommunication that has the inter-entity of different coding function by the code conversion realization, for the convenience of describing, all SGWs can be called ALG, its media gateway of controlling is called TrGW, also the gateway device of handling IMS signaling and medium can be referred to as the signaling media gateway, such as, P-CSCF and AGW can be considered as a signaling media gateway.
Because the final purpose of session is to realize that medium connect, therefore need in session, consult media resource information, the agreement of consulting media resource information in the IMS system is Session Description Protocol (SessionDescription Protocol, abbreviate SDP as), the alternant way of agreement is request response pattern, i.e. SDP request must have a SDP to respond (refusing unless make a mistake), SDP request and the content of responding all are media resource information, media resource information comprises medium owner information (comprising address information), the medium link address, medium type and the media port relevant with medium type and codec information etc., in the content that SDP responds, medium quantity, medium quantity during type and order must be asked with SDP, type and order are identical.The content of SDP agreement is by conversation initialized protocol (Session Initiation Protocol, SIP) message body of message is carried, reciprocal process is independent of the request of SIP and responds pattern, that is to say the request of SIP or receive the response in can carry SDP request, also can carry SDP and respond, also can not carry the SDP protocol contents.
Below convenience in order to describe, only listed ALG and TrGW entity among the figure, other IMS entities are route SIP signaling message only, does not influence the description of this article.
Figure 1A is that the IMS media path optimizes schematic diagram, described different media paths and signaling paths accordingly between IMS calling terminal UE1 and the IMS terminal called UE2.
Shown in Figure 1A, the media path that existing calling procedure is set up is: UE1, TrGW1a, TrGW2, TrGW3, TrGW4, UE2, and the media path after optimizing is: UE1, TrGW1b, TrGW4, UE2, media path after the optimization has been lacked than the media path of not optimizing, two TrGW have been lacked, thereby the media path of optimizing more saves resource, and is also more efficient.Wherein SGW ALG1 is controlling TrGW1a and TrGW1b, and ALG2 is controlling TrGW2, and ALG3 is controlling TrGW3, and ALG4 is controlling TrGW4.
The flow chart that Figure 1B optimizes for the existing IMS media path, corresponding with the schematic diagram of Figure 1A, mainly may further comprise the steps:
Step 101, UE1 send SDP to UE2 asks to consult media resource information, such as the call signaling by transmission SIP, be INVITE (invitation) request, carry this SDP request with the message body of this SIP request, the content of SDP request is the media resource information of UE1;
Step 102, the SDP request arrives SGW ALG1, SGW ALG1 selects TrGW1a as media gateway, control the media resource information in this media gateway use SDP request, and branch is used in the media resource that connects far-end, ALG1 also can control the media resource information in the media gateway TrGW1b use SDP request simultaneously, and branch is used in the media resource that connects far-end, ALG1 replaces the media resource information of SDP request with the media resource information that is used for the connection far-end of TrGW1a, nodal information with ALG1 control adds this SDP request back forwarding SDP request then, this nodal information comprises the input field information of TrGW1a, the input field information that also can comprise TrGW1b, the quantity information that also includes codec in the nodal information, the SDP request can ask to transmit by carrying this SDP such as forwarding SIP signaling;
Step 106, SDP request arrive UE2, and UE2 uses the media resource information in the SDP request, and send the SDP response, carry the media resource information of UE2, respond such as " 200OK " by the SIP signaling, carry this SDP response with the message body that this SIP responds, this SDP response arrives ALG4;
Step 107～108, ALG4 are according to receiving that the nodal information in the SDP request judges whether TrGW4 is the media path node, present embodiment TrGW4 is path node, it can be direct-connected with TrGW1b, and then judge according to the codec quantity of ALG1 in the codec information of receiving and the nodal information whether the codec that UE2 selects is supported by ALG1, if the medium link address information of in the SDP response of transmitting, carrying TrGW4 then, if not then directly transmitting the SDP response, this SDP response arrives ALG3;
Step 109～110, identical with step 107～108, ALG3 judges whether TrGW3 is the media path node, and present embodiment TrGW3 is not path node, therefore directly transmits the SDP response;
Step 111～112, identical with step 107～108, ALG2 judges whether TrGW2 is the media path node, and present embodiment TrGW2 is not path node, therefore directly transmits the SDP response;
Step 113～114, identical with step 107～108, ALG1 judges whether TrGW1a or TrGW1b are the media path node, present embodiment TrGW1b is path node, therefore ALG1 control TrGW1b uses the medium link address information of the TrGW4 that carries in the SDP response, and transmits the SDP response of the medium link address information of band TrGW1b;
So far, the media path of optimization is just set up, and media path is UE1, TrGW1b, TrGW4, UE2.
But by above-mentioned description as can be known, existing optimization media path method for building up has only been considered the quantity information of codec, and it can not reflect the variation of codec fully.If deleted the encoder information that certain ALG1 supports such as ALG2, it is second codec, the codec information that UE2 receives is this deleted codec information not, if UE2 has selected second codec information, this moment, ALG4 can judge that the codec that UE2 selects supported by ALG1, thereby select the media path of optimization, the result is communication failure.
Shown in Fig. 1 C, for the flow chart of the existing IMS media path optimization schematic diagram of makeing mistakes, corresponding with the flow chart of Figure 1B, above-described problem has been described, ALG1 supports encoder a and b, and ALG2 has deleted second codec b, and has added codec c, UE2 has selected codec c, the codec information that ALG4 and UE2 see all is b and c, and ALG4 judges that ALG1 supports 2 codecs, so think that ALG1 supports b and c, and the actual ALG1 of being does not support c, and the result is communication failure.
Summary of the invention
The technical problem to be solved in the present invention is exactly the processing method that proposes a kind of SGW and optimize media path, to solve in the prior art problem to the incorrect judgement of codec information.
In order to solve the problems of the technologies described above, the invention provides the processing method that a kind of SGW is optimized media path, comprising:
When receiving the SDP request and transmitting, SGW adds the nodal information that comprises codec information in the SDP request of described forwarding;
When receiving the SDP response, if described SDP response is not with nodal information or is with invalid nodal information, then SGW has judged whether addressable territory according to zero or one or more nodal informations in the SDP request that receives, if have then judge the codec information selected whether in codec list, if nodal information would be covered in the SDP response of described forwarding when transmitting the SDP response; Wherein, SGW obtains described codec list according to the codec information in zero or the one or more nodal informations in the described SDP request that receives;
When receiving the SDP response, if described SDP response band nodal information, the nodal information during then SGW responds according to the SDP that receives judges whether relevant with it, then transmits the SDP response as relevant, otherwise transmits the SDP response with described nodal information.
Further, said method also can have following characteristics:
Described SGW adds the nodal information that comprises codec information in the step in the described SDP request to, described SGW with input field information, medium link address information and receive or the SDP request that sends in the content information of all codecs add in the SDP request of described forwarding as the content of described nodal information;
Described SGW obtains in the step of described codec list according to the codec information in zero or the one or more nodal informations in the described SDP request of receiving, described SGW obtains codec list by the codec information in the nodal information that comprises its addressable territory that finds.
Further, said method also can have following characteristics:
Described SGW adds the nodal information that comprises codec information in the step in the described SDP request to, described SGW with input field information, medium link address information, it is received or the SDP that sends request in the quantity information of codec and the codec information of described SGW deletion add to as the content of described nodal information in the SDP request of described forwarding, the codec information of wherein said SGW deletion comprises content information and the positional information of codec;
Described SGW obtains in the step of described codec list according to the codec information in zero or the one or more nodal informations in the described SDP request of receiving, the codec information of described SGW by undeleting obtains codec list.
Further, said method also can have following characteristics:
When described SGW covers nodal information in the described SDP response, the nodal information of described interpolation comprises medium link address information, also comprises the input field information of described SGW and/or the nodal information corresponding sequence number information that comprises its addressable territory that finds.
Further, said method also can have following characteristics:
Described SGW judges whether relevant with it according to the nodal information in the SDP response that receives, further comprise as the relevant step of then transmitting the SDP response:
Described SGW judges whether relevant with it according to the nodal information in the SDP response that receives, as relevant, then judged whether addressable territory according to zero or one or more nodal informations in the SDP request that receives, if have then judge the codec information selected whether in codec list, if would add nodal information in the SDP response of described forwarding when transmitting the SDP response.
Further, said method also can have following characteristics:
Described SGW judges whether that according to the nodal information in the SDP response that receives relative step comprises:
If the input field in the described nodal information comprises the addressable territory of described SGW, and/or the sequence number in the described nodal information is identical with the sequence number of described SGW nodal information of interpolation in the SDP of described transmission request, and then described SGW is judged relevant with it.
In order to solve the problems of the technologies described above, the present invention also provides a kind of SGW, comprises SDP request transceiver module and SDP response transceiver module,
Described SDP request transceiver module is used for receiving the SDP request and transmits, and the nodal information that comprises codec information is added in the SDP request of described forwarding;
Described SDP response transceiver module is used for receiving the SDP response, if described SDP response is not with nodal information or is with invalid nodal information, zero or one or more nodal informations during then the SDP that receives according to SDP request transceiver module asks have judged whether addressable territory, if have then judge the codec information selected whether in codec list, if nodal information would be covered in the SDP response of described forwarding when transmitting the SDP response; If described SDP response band nodal information, the nodal information in then responding according to the SDP that receives judges whether relevant with it, then transmits the SDP response as relevant, otherwise transmits the SDP response with described nodal information; And described SDP response transceiver module is used for obtaining described codec list according to the codec information in zero or the one or more nodal informations of described SDP request of receiving.
Further, above-mentioned SGW also can have following characteristics:
Described SDP request transceiver module be further used for input field information, medium link address information and receive or the SDP request that sends in the content information of all codecs add in the SDP request of described forwarding as the content of described nodal information;
Described SDP response transceiver module is further used for obtaining codec list by the codec information in the nodal information that comprises its addressable territory that finds.
Further, above-mentioned SGW also can have following characteristics:
Described SDP request transceiver module be further used for input field information, medium link address information, it is received or the SDP request that sends in the quantity information of codec and the codec information of described SGW deletion add to as the content of described nodal information in the SDP request of described forwarding, the codec information of wherein said SGW deletion comprises content information and the positional information of codec;
Described SDP response transceiver module is further used for the codec information by undeleting, and obtains codec list.
Further, above-mentioned SGW also can have following characteristics:
Described SDP response transceiver module is further used for judging whether relevant with it according to the nodal information in the SDP response that receives, as relevant, then judged whether addressable territory according to zero or one or more nodal informations in the SDP request that receives, if have then judge the codec information selected whether in codec list, if would add nodal information in the SDP response of described forwarding when transmitting the SDP response.
The present invention makes SGW can know complete codec list by add the nodal information that comprises codec information in SDP request, has solved in the prior art problem to the incorrect judgement of codec information, and has been easy to realize.
Description of drawings
Figure 1A optimizes schematic diagram for the IMS media path;
The flow chart that Figure 1B optimizes for the existing IMS media path;
Fig. 1 C is the flow chart of the existing IMS media path optimization schematic diagram of makeing mistakes;
Fig. 2 is the flow chart of the embodiment of the invention one;
Fig. 3 is the flow chart of the embodiment of the invention two;
Fig. 4 is the SGW schematic diagram of the embodiment of the invention.
Embodiment
When calling terminal sends the SDP request through one or more SGWs to terminal called, and terminal called is when returning the SDP response through described one or more SGWs to calling terminal, and SGW is transmitted described SDP request or SDP response.
When receiving the SDP request and transmitting, SGW adds the nodal information that comprises codec information in the SDP request of described forwarding;
When receiving the SDP response, if described SDP response is not with nodal information or is with invalid nodal information, then SGW has judged whether addressable territory according to zero or one or more nodal informations in the SDP request that receives, if have then judge the codec information selected whether in codec list, if nodal information would be covered in the SDP response of described forwarding when transmitting the SDP response; Wherein, SGW obtains described codec list according to the codec information in zero or the one or more nodal informations in the described SDP request that receives;
When receiving the SDP response, if described SDP response band nodal information, the nodal information during then SGW responds according to the SDP that receives judges whether relevant with it, then transmits the SDP response as relevant, otherwise transmits the SDP response with described nodal information.
Wherein, preferably, mode one, described SGW adds the nodal information that comprises codec information in the step in the described SDP request to, described SGW with input field information, medium link address information and receive or the SDP request that sends in the content information of all codecs add in the SDP request of described forwarding as the content of described nodal information; Described SGW obtains in the step of described codec list according to the codec information in zero or the one or more nodal informations in the described SDP request of receiving, described SGW obtains codec list by the codec information in the nodal information that comprises its addressable territory that finds.
Preferably, mode two, described SGW adds the nodal information that comprises codec information in the step in the described SDP request to, described SGW with input field information, medium link address information, it is received or the SDP that sends request in the quantity information of codec and the codec information of described SGW deletion add to as the content of described nodal information in the SDP request of described forwarding, the codec information of wherein said SGW deletion comprises content information and the positional information of codec; Described SGW obtains in the step of described codec list according to the codec information in zero or the one or more nodal informations in the described SDP request of receiving, the codec information of described SGW by undeleting obtains codec list.
When described SGW covers nodal information in the described SDP response, the nodal information of described interpolation comprises medium link address information, also comprises the input field information of described SGW and/or the nodal information corresponding sequence number information that comprises its addressable territory that finds.
Preferably, described SGW judges whether relevant with it according to the nodal information in the SDP response that receives, further comprise as the relevant step of then transmitting the SDP response:
Described SGW judges whether relevant with it according to the nodal information in the SDP response that receives, as relevant, then judged whether addressable territory according to zero or one or more nodal informations in the SDP request that receives, if have then judge the codec information selected whether in codec list, if would add nodal information in the SDP response of described forwarding when transmitting the SDP response; , then do not transmit and directly transmit described SDP response in the decoder tabulation if codec information uncorrelated or that select is on the permanent staff.
Described SGW judges whether in the relative step according to the nodal information in the SDP response that receives, if the input field in the described nodal information comprises the addressable territory of described SGW, and/or the sequence number in the described nodal information is identical, then relevant with it with the sequence number of described SGW nodal information of interpolation in the SDP of described transmission request.
The present invention is described in detail below in conjunction with drawings and the specific embodiments.
Embodiment one
Figure 2 shows that corresponding to the flow chart of the embodiment of the invention of Figure 1A, mainly may further comprise the steps:
Step 201, identical with step 101 among Figure 1B;
Step 202, the SDP request arrives SGW ALG1, codec a and b are carried in the SDP request, SGW ALG1 also supports codec a and b, ALG1 selects TrGW1a as media gateway, control the media resource information in this media gateway use SDP request, and branch is used in the media resource that connects far-end, ALG1 also can control the media resource information in the media gateway TrGW1b use SDP request simultaneously, and branch is used in the media resource that connects far-end, ALG1 replaces the media resource information of SDP request with the media resource information that is used for the connection far-end of TrGW1a, then with the nodal information of ALG1 control (comprise that ALG1 receives or the SDP request that sends in the content information of all codecs) transmit the SDP request after adding the node listing information of this SDP request, this nodal information comprises the near-end input field information of TrGW1a, the far-end input field information that also can comprise TrGW1b, the content information that also comprises sequence number and all codecs in the nodal information, the SDP request can ask to transmit by carrying this SDP such as forwarding SIP signaling;
Wherein, the content information of all codecs in the SDP request that receive or that send of adding is made an appointment;
In an embodiment, for convenience of description, represent the combination of zero or one or more nodal informations with node listing information, that is: node listing information is made up of one or more nodal informations usually, also can be sky, when asking to arrive ALG1 such as SDP in this example, this node listing information may be sky, does not namely have nodal information;
Step 206, identical with step 106 among Figure 1B, UE2 has selected codec a;
Step 207～208, ALG4 judges whether the input field of TrGW4 according to the node listing information in the SDP request of receiving, thereby judge TrGW4 certain media gateway before whether can be direct-connected, the near-end input field of present embodiment TrGW4 is identical with the far-end input field of TrGW1b, it is the far-end that the near-end of TrGW4 can direct-connected TrGW1b, and then obtain codec list according to node listing information, the codec list of supporting according to ALG1 (being the codec list that TrGW1b supports) judges that the codec information of UE2 selection is whether in this codec list, if then the codec of UE2 selection is supported (namely being supported by TrGW1b) by ALG1.Present embodiment adds nodal information and also sends in the SDP response for supporting that then selecting TrGW1b is the media path node, and wherein nodal information comprises the sequence number corresponding to ALG1, input field information and the medium link address information of TrGW4;
Step 209～210, ALG3 are according to the nodal information that carries in the response of receiving, judge whether sequence number wherein is relevant with ALG3, or whether input field adds identical in the node listing information to ALG3, judging in the present embodiment is false, TrGW3 certain media gateway after can not be direct-connected is then transmitted the SDP response of carrying nodal information;
Step 211～212, ALG2 are according to the nodal information that carries in the response of receiving, judge whether sequence number wherein is relevant with ALG2, or whether input field adds identical in the node listing information to ALG2, judging in the present embodiment is false, TrGW2 certain media gateway after can not be direct-connected is then transmitted the SDP response of carrying nodal information;
Step 213～214, ALG1 are according to the nodal information that carries in the response of receiving, judge whether sequence number wherein is relevant with ALG1, or whether input field adds identical in the node listing information to ALG1, judge in the present embodiment and set up, TrGW1b certain media gateway after can be direct-connected, medium link address information in the nodal information during then ALG1 control TrGW1b use SDP responds, and send not with the SDP response of nodal information, this SDP responds the medium link address information of carrying TrGW1b;
So far, the media path of optimization is just set up, and media path is UE1, TrGW1b, TrGW4, UE2.
If TrGW1a and TrGW1b are combined into a TrGW1a in the present embodiment, the far-end input field information that ALG1 can not add TrGW1b in the step 202 then, if ALG2 adopts the mode of judging input field in step 211～212, then judge and set up (because of the far-end input field of TrGW1a and the near-end input field of TrGW2 are identical at this moment), owing to be the near-end input field of TrGW2, ALG2 judges that the TrGW before it can be direct-connected with certain TrGW afterwards, then do not use the medium link address information in the nodal information in the SDP response, and transmission does not respond with the SDP of nodal information, or the SDP response is with invalid nodal information, namely medium link address wherein is that the optimization path is continued to seek with the signaling media gateway before informing in the invalid address, the medium link address information in the nodal information is carried in this SDP response, thereby can make TrGW1a and TrGW4 direct-connected.
Embodiment two
Figure 3 shows that corresponding to the flow chart of the present embodiment of Figure 1A, mainly may further comprise the steps:
Step 301, identical with step 101 among Figure 1B;
Step 302, the SDP request arrives SGW ALG1, codec a and b are carried in the SDP request, SGW ALG1 supports codec a and b, ALG1 selects TrGW1a as media gateway, control the media resource information in this media gateway use SDP request, and branch is used in the media resource that connects far-end, ALG1 also can control the media resource information in the media gateway TrGW1b use SDP request simultaneously, and branch is used in the media resource that connects far-end, ALG1 replaces the media resource information of SDP request with the media resource information that is used for the connection far-end of TrGW1a, then with the nodal information of ALG1 control (comprise that ALG1 receives or the SDP request that sends in the quantity information of codec) transmit the SDP request after adding the node listing information of this SDP request, this nodal information comprises the near-end input field information of TrGW1a, the far-end input field information that also can comprise TrGW1b, also comprise the quantity information of sequence number and codec and the codec information of deletion in the nodal information, such as the codec name and with respect to the position of other codecs, the ALG1 that adds in the present embodiment receive or the SDP that sends request in the quantity of codec be 2, the codec information that does not have deletion, the SDP request can ask to transmit by carrying this SDP such as forwarding SIP signaling;
Wherein, the quantity information of all codecs in the SDP request that receive or that send of adding is made an appointment;
Step 306, identical with step 106 among Figure 1B, UE2 has selected codec a;
Step 307～308, ALG4 judges whether the input field of TrGW4 according to the node listing information in the SDP request of receiving, thereby judge TrGW4 certain media gateway before whether can be direct-connected, the near-end input field of present embodiment TrGW4 is identical with the far-end input field of TrGW1b, it is the far-end that the near-end of TrGW4 can direct-connected TrGW1b, and then the codec information that undeletes, the codec a that is about to deletion in the present embodiment places first, thereby obtain codec list (a, b, c, a), and obtain the codec list (a that ALG1 support according to the quantity information 2 of ALG1 codec in the node listing information, b), judge codec information that UE2 selects whether in this codec list, namely ALG4 judges whether the codec that UE2 selects is supported by ALG1, and present embodiment is support, then add nodal information and in the SDP response, also send, wherein comprise the sequence number corresponding to ALG1, the input field information of TrGW4 and medium link address information;
In the present embodiment, if ALG3 does not add codec a, and ALG4 does not add codec a yet, UE2 just can not select a, and may select c, this moment, ALG4 can be judged as the codec that ALG1 does not support that UE2 selects, thereby can not TrGW4 and TrGW1b is direct-connected.
Step 309～310, ALG3 are according to the nodal information that carries in the response of receiving, judge whether sequence number wherein is relevant with ALG3, or whether input field adds identical in the node listing information to ALG3, judging in the present embodiment is false, TrGW3 certain media gateway after can not be direct-connected is then transmitted the SDP response of carrying nodal information;
Step 311～312, ALG2 are according to the nodal information that carries in the response of receiving, judge whether sequence number wherein is relevant with ALG2, or whether input field adds identical in the node listing information to ALG2, judging in the present embodiment is false, TrGW2 certain media gateway after can not be direct-connected is then transmitted the SDP response of carrying nodal information;
Step 313～314, ALG1 is according to the nodal information that carries in the response of receiving, judge whether sequence number wherein is relevant with ALG1, or whether input field adds identical in the node listing information to ALG1, judge in the present embodiment and set up, TrGW1b certain media gateway after can be direct-connected, medium link address information in the nodal information during then ALG1 control TrGW1b use SDP responds, and transmission is not with nodal information with SDP response or the SDP response of nodal information, medium link address wherein is that the optimization path is continued to seek with the SGW before informing in the invalid address, the medium link address information that TrGW1b is carried in this SDP response;
So far, the media path of optimization is just set up, and media path is UE1, TrGW1b, TrGW4, UE2.
As shown in Figure 4, the SGW of the embodiment of the invention comprises SDP request transceiver module and SDP response transceiver module,
Described SDP request transceiver module is used for receiving the SDP request and transmits, and the nodal information that comprises codec information is added in the SDP request of described forwarding;
Described SDP response transceiver module is used for receiving the SDP response, if described SDP response is not with nodal information or is with invalid nodal information, zero or one or more nodal informations during then the SDP that receives according to SDP request transceiver module asks have judged whether addressable territory, if have then judge the codec information selected whether in codec list, if nodal information would be covered in the SDP response of described forwarding when transmitting the SDP response; If described SDP response band nodal information, the nodal information in then responding according to the SDP that receives judges whether relevant with it, then transmits the SDP response as relevant, otherwise transmits the SDP response with described nodal information; And described SDP response transceiver module is used for obtaining described codec list according to the codec information in zero or the one or more nodal informations of described SDP request of receiving.
Described SDP request transceiver module be further used for input field information, medium link address information and receive or the SDP request that sends in the content information of all codecs add in the SDP request of described forwarding as the content of described nodal information; Described SDP response transceiver module is further used for obtaining codec list by the codec information in the nodal information that comprises its addressable territory that finds.
Described SDP request transceiver module be further used for input field information, medium link address information, it is received or the SDP request that sends in the quantity information of codec and the codec information of described SGW deletion add to as the content of described nodal information in the SDP request of described forwarding, the codec information of wherein said SGW deletion comprises content information and the positional information of codec; Described SDP response transceiver module is further used for the codec information by undeleting, and obtains codec list.
Described SDP response transceiver module is further used for judging whether relevant with it according to the nodal information in the SDP response that receives, as relevant, then judged whether addressable territory according to zero or one or more nodal informations in the SDP request that receives, if have then judge the codec information selected whether in codec list, if would add nodal information in the SDP response of described forwarding when transmitting the SDP response.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. a SGW is optimized the processing method of media path, comprising:
When receiving the SDP request and transmitting, SGW adds the nodal information that comprises codec information in the SDP request of described forwarding;
When receiving the SDP response, if described SDP response is not with nodal information or is with invalid nodal information, then SGW has judged whether addressable territory according to zero or one or more nodal informations in the SDP request that receives, if have then judge the codec information selected whether in codec list, if nodal information would be covered in the SDP response of described forwarding when transmitting the SDP response; Wherein, SGW obtains described codec list according to the codec information in zero or the one or more nodal informations in the described SDP request that receives;
When receiving the SDP response, if described SDP response band nodal information, the nodal information during then SGW responds according to the SDP that receives judges whether relevant with it, then transmits the SDP response as relevant, otherwise transmits the SDP response with described nodal information.
2. the method for claim 1 is characterized in that,
Described SGW adds the nodal information that comprises codec information in the step in the described SDP request to, described SGW with input field information, medium link address information and receive or the SDP request that sends in the content information of all codecs add in the SDP request of described forwarding as the content of described nodal information;
Described SGW obtains in the step of described codec list according to the codec information in zero or the one or more nodal informations in the described SDP request of receiving, described SGW obtains codec list by the codec information in the nodal information that comprises its addressable territory that finds.
3. the method for claim 1 is characterized in that,
Described SGW adds the nodal information that comprises codec information in the step in the described SDP request to, described SGW with input field information, medium link address information, it is received or the SDP that sends request in the quantity information of codec and the codec information of described SGW deletion add to as the content of described nodal information in the SDP request of described forwarding, the codec information of wherein said SGW deletion comprises content information and the positional information of codec;
Described SGW obtains in the step of described codec list according to the codec information in zero or the one or more nodal informations in the described SDP request of receiving, the codec information of described SGW by undeleting obtains codec list.
4. the method for claim 1 is characterized in that,
When described SGW covers nodal information in the described SDP response, the nodal information that adds comprises medium link address information, also comprises the input field information of described SGW and/or the nodal information corresponding sequence number information that comprises its addressable territory that finds.
5. the method for claim 1 is characterized in that,
Described SGW judges whether relevant with it according to the nodal information in the SDP response that receives, further comprise as the relevant step of then transmitting the SDP response:
Described SGW judges whether relevant with it according to the nodal information in the SDP response that receives, as relevant, then judged whether addressable territory according to zero or one or more nodal informations in the SDP request that receives, if have then judge the codec information selected whether in codec list, if would add nodal information in the SDP response of described forwarding when transmitting the SDP response.
6. as claim 1 or 5 described methods, it is characterized in that,
Described SGW judges whether that according to the nodal information in the SDP response that receives relative step comprises:
If the input field in the described nodal information comprises the addressable territory of described SGW, and/or the sequence number in the described nodal information is identical with the sequence number of described SGW nodal information of interpolation in the SDP of described transmission request, and then described SGW is judged relevant with it.
7. a SGW is characterized in that, comprises SDP request transceiver module and SDP response transceiver module,
Described SDP request transceiver module is used for receiving the SDP request and transmits, and the nodal information that comprises codec information is added in the SDP request of described forwarding;
Described SDP response transceiver module is used for receiving the SDP response, if described SDP response is not with nodal information or is with invalid nodal information, zero or one or more nodal informations during then the SDP that receives according to SDP request transceiver module asks have judged whether addressable territory, if have then judge the codec information selected whether in codec list, if nodal information would be covered in the SDP response of described forwarding when transmitting the SDP response; If described SDP response band nodal information, the nodal information in then responding according to the SDP that receives judges whether relevant with it, then transmits the SDP response as relevant, otherwise transmits the SDP response with described nodal information; And described SDP response transceiver module is used for obtaining described codec list according to the codec information in zero or the one or more nodal informations of described SDP request of receiving.
8. SGW as claimed in claim 7 is characterized in that,
Described SDP request transceiver module be further used for input field information, medium link address information and receive or the SDP request that sends in the content information of all codecs add in the SDP request of described forwarding as the content of described nodal information;
Described SDP response transceiver module is further used for obtaining codec list by the codec information in the nodal information that comprises its addressable territory that finds.
9. SGW as claimed in claim 7 is characterized in that,
Described SDP request transceiver module be further used for input field information, medium link address information, it is received or the SDP request that sends in the quantity information of codec and the codec information of described SGW deletion add to as the content of described nodal information in the SDP request of described forwarding, the codec information of wherein said SGW deletion comprises content information and the positional information of codec;
Described SDP response transceiver module is further used for the codec information by undeleting, and obtains codec list.
10. SGW as claimed in claim 7 is characterized in that,
Described SDP response transceiver module is further used for judging whether relevant with it according to the nodal information in the SDP response that receives, as relevant, then judged whether addressable territory according to zero or one or more nodal informations in the SDP request that receives, if have then judge the codec information selected whether in codec list, if would add nodal information in the SDP response of described forwarding when transmitting the SDP response.
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| CN 200910212357 CN102055745B (en) | 2009-11-06 | 2009-11-06 | Signaling gateway and processing method of media path optimization thereof |
| PCT/CN2010/078296 WO2011054277A1 (en) | 2009-11-06 | 2010-11-01 | Signaling gateway and processing method for optimizing media path thereof |
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| CN 200910212357 CN102055745B (en) | 2009-11-06 | 2009-11-06 | Signaling gateway and processing method of media path optimization thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101119370A (en) * | 2007-08-24 | 2008-02-06 | 中兴通讯股份有限公司 | Call management system, method and IMS terminal for IMS terminal |
| WO2008083470A1 (en) * | 2007-01-08 | 2008-07-17 | Natural Convergence Inc. | Method and system for mediated codec negotiation |
| CN101292495A (en) * | 2005-10-21 | 2008-10-22 | 西门子公司 | Signalling for establishing an H.324 videotelefony connection between a media gateway and a controller |
| CN101415249A (en) * | 2007-10-16 | 2009-04-22 | 华为技术有限公司 | Method, system and apparatus for negotiating data business signaling of session initialization protocol |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101292495A (en) * | 2005-10-21 | 2008-10-22 | 西门子公司 | Signalling for establishing an H.324 videotelefony connection between a media gateway and a controller |
| WO2008083470A1 (en) * | 2007-01-08 | 2008-07-17 | Natural Convergence Inc. | Method and system for mediated codec negotiation |
| CN101119370A (en) * | 2007-08-24 | 2008-02-06 | 中兴通讯股份有限公司 | Call management system, method and IMS terminal for IMS terminal |
| CN101415249A (en) * | 2007-10-16 | 2009-04-22 | 华为技术有限公司 | Method, system and apparatus for negotiating data business signaling of session initialization protocol |
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