CN101453470A - Session description protocol capability information obtaining method, system and network entity - Google Patents
Session description protocol capability information obtaining method, system and network entity Download PDFInfo
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- CN101453470A CN101453470A CNA2008101896726A CN200810189672A CN101453470A CN 101453470 A CN101453470 A CN 101453470A CN A2008101896726 A CNA2008101896726 A CN A2008101896726A CN 200810189672 A CN200810189672 A CN 200810189672A CN 101453470 A CN101453470 A CN 101453470A
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Abstract
The invention relates to communication technology, in particular to a method, a system and a network entity for acquiring capability information of a session description protocol, so as to solve the problem that one communication party can not acquire the capability information of the session description protocol of the other communication party in the prior art. The technical proposal realizes that one communication party acquires the capability information of the session description protocol of the other communication party through information interaction between two communication parties, in particular applied under an H.248 protocol, and can conveniently realize that a media gateway controller can acquire the capability information of the session description protocol between the communication parties correspondingly from a media gateway through expanding relevant attribute parameters.
Description
Technical field
The present invention relates to the communication technology, particularly a kind of session description protocol capability information obtaining method, system and network entity.
Background technology
MGC (Media Gateway Controller, Media Gateway Controller) and MG (Media Gateway, media gateway) are two key members in the packet network.MGC is responsible for CCF, and MG is responsible for the service bearer function, realize by this calling out separating of control plane and service bearer plane, thus abundant shared network resource, simplified apparatus upgrading and professional expansion reduce development and maintenance cost greatly.For example shown in Figure 1, be MG among the NGN (Next Generation Network, next generation network) and MGC networking schematic diagram, wherein, the communication protocol between the MG is RTP (Real-time Transport Protocol, RTP) agreement; H.248/MeGaCo present widely used communication protocol have (Gateway Control Protocol, gateway control protocol) and two kinds of agreements of MGCP (MediaGateway Control Protocol, MGCP) between MG and the MGC.Wherein, MGCP version 1 is by IETF (Internet Engineering Task Force, the Internet engineering duty group) works out and revise in October, 1999 in January, 2003, H.248/MeGaCo version 1 is by IETF and ITU (InternationalTelecommunications Union, International Telecommunications Union) revises in common formulation of in November, 2000 and in June, 2003, H.248 version 2 is worked out and is revised in March, 2004 in May, 2002 by ITU, and H.248 version 3 is worked out in September, 2005 by ITU.
To be example H.248, the various resources on the MG are terminal (Tennination) by abstract representation.Terminal is divided into physics (Physical) terminal and interim (Ephemeral) terminal again, on behalf of some, the former have the physical entity of semipermanent existence, TDM (Time Division Multiplex for example, time division multiplexing) passage etc., the public resource that on behalf of some provisional application, the latter discharge with the back, for example rtp streaming etc.Represent MG integral body with root (Root) terminal in addition.Combination between the terminal is context (Context) by abstract representation.Context can comprise a plurality of terminals, thereby describes the correlation of terminal room with topology (Topology).For also related terminal not taking place, be called the contextual special context of sky (Null) by one and comprise with other terminal.
Based on this abstract model of agreement, in fact continuing of calling be exactly to terminal and contextual operation.This operation is finished by the order between MGC and the MG (Command) request (Request) and response (Reply).Command type comprises interpolation (Add), revises (Modify), deletes (Subtract), moves (Move), audit value (AuditValue), auditability (AuditCapabilities), circular (Notify), service change (ServiceChange).Command parameter is also referred to as descriptor (Descriptor), is classified as attribute (Property), signal (Signal), incident (Event), statistics (Statistic) etc.Parameter with professional correlation polymerization in logic becomes bag (Package).
H.248 use Local (local terminal) and Remote (far-end) descriptor to consult media parameter, what wherein define in the Local descriptor is the parameter of local terminal receiving media, and the Remote descriptor definition is the parameter of far-end receiving media, for example receiver address, receiving port, medium type etc.H.248 the SDP (Session Description Protocol) of the RFC2327 that default use is worked out based on IETF in Local and Remote descriptor describes these media parameter.Yet IETF work out in addition have RFC3266 be in order to support IPv6 to the renewal that RFC2327 did, and IETF revises SDP in the RFC4566 that works out recently, this has caused the change of agreement grammer.
Along with RFC3266 and RFC4566 also will be applied in H.248, realize that the MG of the different RF C that these are relevant with SDP will be endowed different SDP abilities, comprise SDP parameter and the possible value of these parameters that may support.MGC need understand these SDP abilities of MG, could use these abilities in to the control of MG effectively.Though allow MGC that Local on the MG and Remote descriptor are audited in the present H.248 agreement, do not provide the mechanism that MGC obtains MG associated SDP ability information.
Summary of the invention
The invention provides a kind of session description protocol capability information obtaining method, system and network entity, in order to solve the problem that the side that communicates by letter in the prior art can't obtain the opposing party's session description protocol capability information.
The invention provides a kind of session description protocol capability information obtaining method, comprising:
First network entity is to the session description protocol capability information of described second network entity of the second network entity request;
Described second network entity response described request returns to described first network entity with the session description protocol capability information of local terminal.
In the described method, described session description protocol capability information comprises the value of Session Description Protocol property parameters and this Session Description Protocol property parameters correspondence.
Further, described method comprises the steps: that also the session description protocol capability information of described second network entity that described second network entity will receive is saved in this locality.
Wherein, pass through H.248 protocol communication between described first network entity and second network entity.
Under agreement H.248, the request that described first network entity sends to second network entity can be the session description protocol capability audit command request of corresponding property parameters respectively of the first network entity desire request that carries;
Described second network entity is according to described audit command request, the session description protocol capability information of the local terminal of the first network entity desire request is carried in the command response of this command request and returns to described first network entity.
Under agreement H.248, the request that described first network entity sends to second network entity can be the audit command request of the property parameters sign that carries all session description protocol capability correspondences of representative request;
Described second network entity responds described audit command request, all session description protocol capability information of local terminal is carried in the command response of this command request and returns to described first network entity.
Wherein, be provided with the property parameters of described session description protocol capability correspondence in the described command response, the session description protocol capability information of described second network entity is set to the value of corresponding property parameters.
The present invention also provides a kind of session description protocol capability Information Acquisition System, comprises first network entity and second network entity, wherein:
Comprise in described first network entity: to the module of the session description protocol capability information of described second network entity of the second network entity request;
Comprise in described second network entity: respond the request of described first network entity, the session description protocol capability information of local terminal is returned to the module of described first network entity.
Further, also comprise in described first network entity: first memory module of preserving the session description protocol capability information of described second network entity.
Further, comprise also in described first network entity that first transceiver module sends described request;
Also comprise in described second network entity: second transceiver module receives described request and sends described information.
Wherein, described first network entity is a Media Gateway Controller, and described second network entity is a media gateway, passes through H.248 protocol communication between this Media Gateway Controller and the media gateway.
Beneficial effect of the present invention is as follows:
A kind of session description protocol capability information obtaining method provided by the invention, system, by bipartite interacting message, realized that communication one side obtains its session description protocol capability information from the opposing party, when under agreement H.248, using especially, by the expansion corresponding attribute parameters, can realize easily that Media Gateway Controller obtains session description protocol capability information between corresponding from media gateway.
Description of drawings
Fig. 1 is MG and a MGC networking schematic diagram among the NGN;
Fig. 2 is the main schematic flow sheet of first kind of session description protocol capability information obtaining method of the present invention;
Fig. 3 is a kind of primary structure schematic diagram of session description protocol capability Information Acquisition System of the present invention and network entity.
Embodiment
A kind of session description protocol capability information obtaining method provided by the invention comprises:
First network entity is to the session description protocol capability information of the second network entity request, second network entity;
The second network entity response request returns to first network entity with the session description protocol capability information of local terminal.
When between first network entity and second network entity during, the defined SDP parameter of RFC4566 can be defined as extended attribute (Property) parameter H.248 respectively in registration (Registry) type of IANA (the Internet assigned numbering tissue) by protocol communication H.248.These SDP parameter types comprise:
● host-host protocol (proto)
● bandwidth statement (bwtype)
● network type (nettype)
● address style (addrtype)
● key (enckey)
● session level Attribute domain (att-filed (session level))
● session and media-level attributes territory (att-field (both session and media level))
● only media-level attributes territory (att-field (media level only))
● unknown level Attribute domain (att-field (unknown level)).
Above-mentioned property parameters is represented the value that can be associated with its pairing registration type respectively, and data type is character string (String) tabulation, is provided with in SOT state of termination, is read-only parameter.
As shown in Figure 2, H.248 realizing that the main flow process of said method of the present invention comprises the steps: under the agreement
Step S201, first network entity send the audit command request to second network entity, carry the property parameters of above-mentioned each SDP ability correspondence of the first network entity desire request in the audit command request;
Under agreement H.248, the request that described first network entity sends to second network entity can be the SDP ability audit command request of corresponding property parameters respectively of the first network entity desire request that carries; Described second network entity is according to described audit command request, the SDP ability information of the local terminal of the first network entity desire request is carried in the command response of this command request and returns to described first network entity.
Under agreement H.248, described first network entity can also send to the request of second network entity can for example carry an asterisk wildcard for the audit command request of the property parameters sign that carries all SDP ability correspondences of representative request; Described second network entity responds described audit command request, all SDP ability information of local terminal is carried in the command response of this command request and returns to described first network entity.
Step S202, second network entity be according to the audit command request, the SDP ability information of the first network entity desire request local terminal is carried in the command response of this command request and returns to first network entity;
Wherein, be provided with the property parameters of above-mentioned each SDP ability correspondence of the first network entity desire request in the command response, the SDP ability information of second network implementation is set to the value of corresponding property parameters respectively; Perhaps according to described asterisk wildcard, be provided with second the network entity all property parameters and the corresponding value of each SDP ability correspondence of support in the command response, the value of the unsupported property parameters correspondence of second network entity is empty.
The session description protocol capability information of second network entity that step S203, first network entity will receive is saved in this locality.
A kind of application scenarios of technique scheme is: first network entity is MGC, second network entity is MG, typically, in order to determine the SDP ability of MG, comprise SDP parameter and the possible value of these parameters that to support, MGC should send the audit command request to MG at above-mentioned property parameters, audit value (AuditValue) command request for example, and MG will will return to MGC with value that each property parameters of being audited may be associated in corresponding command response then.MGC also can use wildcard (Wildcard) to come above-mentioned all properties parameter is audited simultaneously.If the pairing SDP parameter of the property parameters that MG does not support certain to be audited, its value tabulation with this property parameters may be associated that returns to MGC is sky so.MGC just can obtain the SDP ability of MG by these property parameters of auditing thus.
For example the bag called after SDP ability (SDP Capability) under the property parameters of these expansions is wrapped, with the property parameters of host-host protocol (proto) registration type correspondence also called after host-host protocol (proto), with the property parameters of address style (addrtype) registration type correspondence also called after address style (addrtype).MGC sends at the host-host protocol (proto) of SDP ability (SDP Capability) bag and audit value (AuditValue) command request of address style (addrtype) property parameters to MG, MG just is placed on own host-host protocol RTP and the TCP that is supported in the tabulation as the possible value of host-host protocol (proto) property parameters in corresponding command response, the own address style IP4 that is supported is placed in the tabulation as the possible value of address style (addrtype) property parameters, returns to MGC together.MGC just can recognize that the transport-type that MG supports is RTP or TCP thus, and address style is IPv4.
As shown in Figure 3, the present invention also provides a kind of session description protocol capability Information Acquisition System, comprises first network entity 300 and second network entity 400, wherein:
Comprise in first network entity 300: first transceiver module 301;
Also comprise in first network entity 300: by the module of first transceiver module 301 to the session description protocol capability information of the second network entity request, second network entity, for example request module among Fig. 3 302;
Also comprise in first network entity 300: first memory module 303 of preserving the session description protocol capability information of second network entity;
Comprise in second network entity 400: second transceiver module 401;
Also comprise in second network entity 400: respond the request of first network entity 300, the session description protocol capability information of local terminal is returned to the module of first network entity 300, respond module 402 for example shown in Figure 3 by second transceiver module 401.
Wherein, the first above-mentioned network entity is a Media Gateway Controller, and second network entity is a media gateway, passes through H.248 protocol communication between this Media Gateway Controller and the media gateway.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (18)
1, a kind of session description protocol capability information obtaining method is characterized in that, comprises the steps:
First network entity is to the session description protocol capability information of described second network entity of the second network entity request;
Described second network entity response described request returns to described first network entity with the session description protocol capability information of local terminal.
2, the method for claim 1 is characterized in that, described session description protocol capability information comprises the session description protocol parameters supported and the value of this session description protocol parameters correspondence.
3, the method for claim 1 is characterized in that, passes through H.248 protocol communication between described first network entity and second network entity.
4, method as claimed in claim 3 is characterized in that:
The request that described first network entity sends to second network entity is the audit command request that carries the session description protocol capability information of the first network entity desire request;
Described second network entity is according to described audit command request, the session description protocol capability information of the local terminal of the first network entity desire request is carried in the command response of this command request and returns to described first network entity.
5, method as claimed in claim 4 is characterized in that, is provided with the corresponding respectively property parameters of described session description protocol capability in the described command request.
6, method as claimed in claim 3 is characterized in that:
The request that described first network entity sends to second network entity is the audit command request that carries the sign of all session description protocol capability information of representative request;
Described second network entity responds described audit command request, all session description protocol capability information of local terminal is carried in the command response of this command request and returns to described first network entity.
7, as claim 4 or 6 described methods, it is characterized in that, be provided with the corresponding respectively property parameters of described session description protocol capability in the described command response, the session description protocol capability information of described second network entity is set to the value of corresponding property parameters.
8, method as claimed in claim 7 is characterized in that, in the described command response, the value of the unsupported property parameters correspondence of second network entity is empty.
9, the method for claim 1 is characterized in that, described first network entity is a Media Gateway Controller, and described second network entity is a media gateway.
10, a kind of session description protocol capability Information Acquisition System comprises first network entity and second network entity, it is characterized in that:
Comprise in described first network entity: to the module of the session description protocol capability information of described second network entity of the second network entity request;
Comprise in described second network entity: respond the request of described first network entity, the session description protocol capability information of local terminal is returned to the module of described first network entity.
11, system as claimed in claim 10 is characterized in that, also comprises in described first network entity: first memory module of preserving the session description protocol capability information of described second network entity.
12, system as claimed in claim 11 is characterized in that:
Comprise also in described first network entity that first transceiver module sends described request;
Also comprise in described second network entity: second transceiver module receives described request and sends described information.
13, system as claimed in claim 10 is characterized in that, described first network entity is a Media Gateway Controller, and described second network entity is a media gateway, passes through H.248 protocol communication between this Media Gateway Controller and the media gateway.
14, a kind of network entity comprises first transceiver module, it is characterized in that, described network entity also comprises: by the module of described first transceiver module to this opposite end session description protocol capability information of Correspondent Node request.
15, network entity as claimed in claim 14 is characterized in that, also comprises in the described network entity: first memory module of preserving the session description protocol capability information of described second network entity.
As claim 14 or 15 described network entities, it is characterized in that 16, described network entity is a Media Gateway Controller.
17, a kind of network entity comprises second transceiver module, it is characterized in that, described network entity also comprises: the module that sends the session description protocol capability information of local terminal by described second transceiver module.
18, network entity as claimed in claim 17 is characterized in that, described network entity is a media gateway.
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| CNA2008101896726A CN101453470A (en) | 2006-10-16 | 2006-10-16 | Session description protocol capability information obtaining method, system and network entity |
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| CNA2008101896726A CN101453470A (en) | 2006-10-16 | 2006-10-16 | Session description protocol capability information obtaining method, system and network entity |
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| CNA2006101319908A Division CN101166179A (en) | 2006-10-16 | 2006-10-16 | Acquisition method, system and network entity for session description protocol capability information |
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Application publication date: 20090610 |