CN101917745B - Capability negotiation system, apparatus and method in a telecommunications network - Google Patents

Capability negotiation system, apparatus and method in a telecommunications network Download PDF

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Publication number
CN101917745B
CN101917745B CN2010101570358A CN201010157035A CN101917745B CN 101917745 B CN101917745 B CN 101917745B CN 2010101570358 A CN2010101570358 A CN 2010101570358A CN 201010157035 A CN201010157035 A CN 201010157035A CN 101917745 B CN101917745 B CN 101917745B
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preference
media gateway
ability
node
network
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CN101917745A (en
Inventor
L·格拉夫
M·霍利斯
P·霍利斯
N·迪基克
D·德尼科罗
S·特里尔
C·格罗维斯
S·拉姆斯特伦
I·赖蒂纳
L·卡里
J·诺格拉-罗德里格茨
B·丁勒
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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Priority claimed from GB9911441A external-priority patent/GB2350257A/en
Priority claimed from GB9914654A external-priority patent/GB2351414A/en
Priority claimed from GB9914700A external-priority patent/GB2351416B/en
Priority claimed from GB9915366A external-priority patent/GB2352127A/en
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
    • H04M7/0072—Speech codec negotiation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/06—Arrangements for interconnection between switching centres using auxiliary connections for control or supervision, e.g. where the auxiliary connection is a signalling system number 7 link
    • H04M7/063—Arrangements for interconnection between switching centres using auxiliary connections for control or supervision, e.g. where the auxiliary connection is a signalling system number 7 link where the telephone network is a network other than PSTN/ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • H04Q3/0025—Provisions for signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5603—Access techniques
    • H04L2012/5604—Medium of transmission, e.g. fibre, cable, radio
    • H04L2012/5607—Radio
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5629—Admission control
    • H04L2012/5631—Resource management and allocation
    • H04L2012/5632—Bandwidth allocation
    • H04L2012/5634—In-call negotiation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
    • H04L2012/5652—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly
    • H04L2012/5653—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly using the ATM adaptation layer [AAL]
    • H04L2012/5656—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly using the ATM adaptation layer [AAL] using the AAL2
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5671—Support of voice
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/24—Negotiation of communication capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/2281—Call monitoring, e.g. for law enforcement purposes; Call tracing; Detection or prevention of malicious calls
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13034—A/D conversion, code compression/expansion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13098—Mobile subscriber
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13176—Common channel signaling, CCS7
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13196—Connection circuit/link/trunk/junction, bridge, router, gateway
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13204—Protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13209—ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1329—Asynchronous transfer mode, ATM
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13339—Ciphering, encryption, security
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13345—Intelligent networks, SCP
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1338—Inter-exchange connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13389—LAN, internet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/02—Inter-networking arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/24—Interfaces between hierarchically similar devices between backbone network devices

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephonic Communication Services (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

A method of negotiating a call capability between signaling points in a telecommunications system. The method comprises sending a capability preference or prioritised list of preferences from an originating signaling point to a terminating signaling point or signaling transfer point, at the call control level. A capability acceptance is returned from the terminating signaling point or signaling transfer point to the originating signaling point at the Call Control level, if the terminating signaling point or signaling transfer point accepts a preference sent by the originating signaling point.

Description

The system, equipment and the method that are used for the capability negotiation of communication network
The application Chinese patent application No.00810481.6 of the same name that to be applicant Ellison Telephone Co., Ltd submit on May 9th, 2000 divides an application.
Technical field
The present invention relates to the capability negotiation method in the communication network, especially but not necessarily relate to the negotiation of suitable audio coder ﹠ decoder (codec).
Background technology
The communication network of today depends on Signaling System 7(SS-7) (SS7) to a great extent, with it as the control call connection with process in the network basis of signaling information transmission between the signalling point.Generally, one or more application of given signalling point will utilize SS7 to follow the peer application of other signalling point to communicate by letter with User Part with User Part.The example of User Part has ISUP (ＩＳＤＮUser Part) and TUP (Telephone User Part), and the example of applying portion has INAP (intelligent network application part) and MAP (MAP).Tradition SS7 protocol stack comprises message transfer part MTP1, MTP2 and MTP3, and it formats signaling message for the transmission on the physical layer, also will realize various routing functions.
In communication network, substitute traditional Signaling System Number 7 with non-standard (namely Telecoms is non-traditional) signalling mechanism the Telecoms people are very interesting.Do like this is in order to raise the efficiency, to save cost.People have considered much to utilize Internet Protocol (IP) network command transmitting information between signalling point.The advantage of ip network is them by utilizing packet switching to utilize fully transfer resource, and because this technology has obtained being widely used so cost relatively low (comparing with the special communication technology).People are interesting other transmission technology mechanism that adopts also, comprises AAL1/2/5, FR etc.
The ISUP standard that is used for foundation and control call connection in communication network is closely connected with Signaling System 7(SS-7), can't directly it be used for other non-standard transmission technology, for example internet protocol negotiation AAL2.Like this, comprise that several normal structures of ITU-T, ETSI and ANSI are considering to control the signaling protocol standard of calling at present, it is irrelevant with these transmission mechanisms.It can be regarded as from this agreement and separate, only follow the carrying person who sets up " pipeline " parameter by user plane data to control function and transmit between node, they are transmission mechanism special uses.The New Deal that is called with the irrelevant calling control (TICC) of transmission has kept CCF, for example is the business (for example call out and shift) that the calling between given caller and the callee activates, and the Route Selection of whole user plane data.
Produced an open interface at the new network architecture of calling out and the separation of carrying person's key-course obtains between controlling call entity and carrying person's controlled entity, these entities are called respectively media gateway controller and media gateway.Later on this open interface is called X-CP, its example has the MEGACO work of IETF and H.248 working of ITU seminar 16 (SG16).
Traditional fixed telephone network adopts pulse code modulation to come the transmission user panel data, such as the speech between the network node, fax etc.On the other hand, modern Cellular Networks usually adopts one or more encoder/decoder (being called " codec ") to come the compressed voice signal, effectively transmits by air interface and in cellular network inside.When between two networks (perhaps terminal) of supporting difference or multi-language coding-decoding device, having call to connect, can between these terminals, hold consultation to determine to adopt suitable codec.If do not carry out this negotiation, just need in the enterprising line code conversion of the interface of these networks, namely convert another speech coding to from a kind of phonetic code.Consider from resource view, code conversion is of a high price, and it can reduce voice quality significantly, increases the processing time delay.Therefore codec negotiation is best selection.
Except codec negotiation, in conventional telecommunication network, usually need to hold consultation for other function and parameter.For example, may need security capabilities is held consultation, for example between the node of communication network or terminal, carry out voice encryption and data encryption.
Summary of the invention
The present invention relates to a kind of signalling point, be used for telecommunication system in another one signalling point consultation call ability, calling control wherein and carrying person's key-course are by the control of agreement independently, this signalling point comprises:
Be used on call control layer the parts to terminating signalling point or signaling transfer point transmitting capacity preference or preference priority inventory; And
Be used at the parts of call control layer reception from the approval of the ability of terminating signalling point or signaling transfer point, the preference that signalling point sends if terminating signalling point or signaling transfer point acceptance are started is with regard to the approval of transmitting capacity;
If wherein the selection of call control layer ability had influence on carrying person's key-course, this signalling point is by notice carrying person key-course, and the selection of the ability of the described call control layer is made a response.
The present invention relates to a kind of media gateway controller of telecommunication system, calling control wherein and carrying person's key-course are by independently agreement control, and this device comprises:
Be used for the parts from a reciprocity media gateway controller receiving ability preference or preference priority inventory, wherein said ability preference or preference priority inventory with will be relevant in the connection that telecommunication system is set up;
Be used for communicating with media gateway by the control of media gateway controller, with the parts of the availability of the preference determining to be received at the media gateway; And
According in the determined availability of media gateway, ability preference approval message is returned the parts of described reciprocity media gateway controller.
The present invention relates to a kind of media gateway of telecommunication system, calling control wherein and carrying person's key-course are by independently agreement control, and this device comprises:
Be used for the parts from media gateway controller receiving ability preference or preference priority inventory, wherein said ability preference or preference priority inventory with will be relevant in the connection that telecommunication system is set up,
Select the parts of preference according to the availability of the preference on the media gateway; With
Be used for sending selected preference to the parts of described media gateway controller.
The present invention relates to a kind of method of media gateway controller of operating telecommunication system, calling control wherein and carrying person's key-course are by independently agreement control, and the method comprises the following steps:
From a reciprocity media gateway controller receiving ability preference or preference priority inventory, wherein said ability preference or preference priority inventory with will be relevant in the connection that telecommunication system is set up;
Communicate with the media gateway by media gateway controller control, with the availability of the preference determining on the media gateway, to be received; And
According in the determined availability of media gateway, ability preference approval message is returned described reciprocity media gateway controller.
The present invention relates to a kind of method of media gateway of operating telecommunication system, calling control wherein and carrying person's key-course are by independently agreement control, and the method comprises the following steps:
From media gateway controller receiving ability preference or preference priority inventory, wherein said ability preference or preference priority inventory with will be relevant in the connection that telecommunication system is set up,
Availability according to the preference on the media gateway is selected preference; And send selected preference to described media gateway controller.
Description of drawings
Fig. 1 illustrates a plurality of signalling points in the communication network; With
Fig. 2 (situation A) illustrates the signaling flow between the signalling point shown in Figure 1 in first embodiment of the present invention;
Fig. 2 (case B) illustrates the signaling flow between the signalling point shown in Figure 1 in second embodiment of the present invention;
Fig. 3 is the communication network that comprises media gateway controller and media gateway;
Fig. 4 is a flow chart for the general ability negotiations process of network shown in Figure 3;
Fig. 5 illustrates the signaling flow of the intermediate node that negotiations process relates between origination node and the end-node;
Fig. 6 illustrates other one group of signaling flow of an intermediate node that relates in the process of holding consultation between origination node and the end-node;
Fig. 7 illustrates the telecommunication system of Known designs;
Fig. 8 illustrates a telecommunication system;
Fig. 9 illustrates that the codec negotiation process relates in the system shown in Figure 8, first group of signal in first embodiment of the present invention; With
Figure 10 illustrates second group of signal that the codec negotiation process relates in the system shown in Figure 8 in second embodiment of the present invention.
Embodiment
Drawn a part of communication network in Fig. 1, it comprises two signalling points, is called later on node A and C.These two nodes may be telephone exchanges for example, and they may belong to same Virtual network operator, also can belong to heterogeneous networks operator.In this example, node A is the origination node that calling party's (not drawing) connects, and node C represents the end-node that the callee connects.Each signalling point comprises that one is called out control (CC) part and carrying person's control (BC) part, that is to say, calling control and carrying person control function and be separated into two independently protocol layers.Call control department divides formation a call control layer, and it is responsible for calling out Route Selection and the control function that shifts with other.Carrying person's control section is responsible for setting up pipeline at carrying person's control section, and definite carrying person's control section is used for the size of the pipeline of transmission user panel data.
Consider now carrying person's key-course, it comprises carrying person's network, and it can be a for example ip network.In this ip network, one or more carrying person's exchange point is arranged, although only drawn such point (Node B) among Fig. 1.For ip network, these carrying person's exchange points will be the Internet Protocol routers.Obviously, if carrying person's network is an ATM or AAL2 network, carrying person's exchange point will be respectively ATM or AAL2 switch so.
If the calling party sends calling, for example by picking up his phone, just (namely calling party) receives information to the signalling point node A that starts from the source at call control layer, and carrying person's resource requirement is described.The signalling point that starts on the basis of source information and/or signalling point and home network ability thereof is determined must be with an option inventory of terminating signalling point node C negotiation.
Node A lists possible selection subsequently in the message of dividing to call control department, it wishes to utilize this message to consult a concrete ability (the node C among Fig. 1).This message illustrates the preference degree of each option.
Node C utilizes node A to select the best option that its supports for the priority of each option appointment in this inventory, that is to say, if its support node A has shown the another one option in the inventory of more liking, node A does not just select this option.Node C tells which option node A has chosen.
If this negotiation result can affect carrying person's articulamentum, just must take adequate measures at carrying person's layer, change negotiation result.This is finished by carrying person's control protocol.Two kinds of situations might occur: forward bearer person revises (the situation A in the picture) or backward carrying person revises (case B among Fig. 2).
An example of the ability that can hold consultation in order to upper method is codec capabilities.Generally speaking, all be to convert speech coding to PCM in radio access network, because this is unique phonetic matrix that traditional fixed telephone network allows.But, because conversion can destroy voice quality significantly, so some cellular standards (for example GSM, PDC) have been specified avoided the method changed when connecting between two compatible terminals (two GSM terminals that for example have identical codec).Because most current portable terminals are supported several codecs, so these methods also adopt the codec negotiation mode, but it has some serious shortcoming with general negotiation mechanism comparison given here.
Audio coder ﹠ decoder (codec) or be closely connected (in PDC with mobile environment, codec is a service of MAP (MAP) agreement) or it the use of hardware and transfer resource is not optimized (in GSM, codec negotiation is the part without tandem work agreement).Be always voice and connect distribution two code converters (TRAU) and a 64kbps channel, and no matter in fact whether change).At present, different mobile standards solve this problem with different modes, and before this without any solution.
The another one ability example that may need to hold consultation is security capabilities (voice encryption, data encryption etc.).People are very interested in this in public telecommunication network, and the foreseeable future more can be like this.But the protection user plane information has several different methods.Adopt at present multiple encryption algorithms and DEA, and many new algorithms occurred.Therefore, need to consult the mode of security capabilities in public telecommunication network, the present invention just can provide this mode.
Above description has related to carrying person's key-course and call control layer.Fig. 3 illustrates to have the telecommunication system that control and carrying person's key-course are called out in division in further detail.This call control layer comprises a plurality of media gateway controllers (MGC_A, MGC_B and MGC_C), and carrying person's key-course then comprises a plurality of media gateways (MG_1～MG_6).First media gateway (MG_1, MG_6) provides a carrying person to connect at an AAL2 network, and second media gateway (MG_2, MG_5) then provides a carrying person to connect at an ip network.The 3rd media gateway (MG_3, MG_4) provides carrying person to connect at a STM network.As can be seen from Figure 3, each media gateway controller is used for by two or three media gateways of an open interface control (X-CP_1～X-CP_3).
As mentioned above, capability negotiation carries out at call control layer, namely carries out between media gateway controller.In addition, X-CP offers device is controlled their media gateway controller media gateway support for media gateways " notice " ability and option (for example ability equals compressed voice, and option equals the codec inventory).Whether X-CP also generator makes the media gateway can carry out capability negotiation, thereby the assurance ability selects to be not only the ability based on the gateway appointment, also current available based on these abilities.If can not use, the media gateway just might not have the resource support, and it follows media gateway controller to consult the option that obtains.For example, media gateway controller need to provide Intelligent network service for calling, and it need to be with interior notice.If media gateway controller is selected a codec in person on the basis of the codec that the media gateway is supported, the media gateway just might can't obtain a TRAU for such codec at present.So the media gateway can be refused this connection, causes dropped calls.
How to address this problem in order illustrating, to consider that media gateway controller receives to connect first from a reciprocity media gateway controller to set up this situation of message, this first message comprise with the relevant option inventory of concrete ability that can consult.The media gateway controller of receipt message is read the inventory of receiving, and deletes it and know the option that this media gateway is not supported from this inventory.This media gateway controller sends to the media gateway by the option inventory that the X-CP interface will be revised subsequently.
The media gateway of receipt message is selected the current option with limit priority that can support of this gateway.What of the needed resource of this option of support the media gateway adjust subsequently, and by the X_CP interface this selection is sent to media gateway controller.Receive after the selected option, media gateway controller is told above-described reciprocity media gateway controller with this selection.
Above-described general ability negotiations process will further be illustrated with reference to flow process shown in Figure 4 below.
In some countries, local government all requires operator to allow monitored call according to law.In order to support Lawful Interception, operator all needs freely to access the user plane data (actual speech or other data that namely so-called " pipeline " transmits on this one deck of carrying person) of each calling in their networks usually.Introduced after the TICC, can come transmission user panel data (for example ATM, IP etc.) with multiple technologies, they support the user plane data that transmission is encrypted.Therefore, unless the Lawful Interception point can be determined security feature and codec (Code And Decode) characteristic of user plane data, otherwise just can not monitored call.Therefore, codec and encryption (safety) algorithm that each BC part (two BC node between) of calling is used need to be known by operator.
On the other hand, the translation of security algorithm and code conversion meeting reduce significantly the service quality of calling and bring extra delay.So, need to reduce the quantity of end-to-end code changeover point of (if possible just avoiding) each calling and the quantity of security algorithm transfer point.
A kind of method that addresses this problem is described below with reference to operating sequence shown in Figure 5.The call control department of node A (seeing Fig. 1) divides and sends message first and divide to the call control department of Node B, and it comprises the column selection item that node A supports, also has the priority of each option.Although this method is particularly suitable for TICC, it is that it also can be used in independently agreement protocol, and this represents with abbreviation UPCN (User Part capability negotiation) in Fig. 5.
Next the call control department of Node B divides and sends message first and divide to the call control department of node C, and it comprises the column selection item that node A and Node B are all supported, and the priority of each option.So node C selects the option with limit priority that its supports, and return first message to Node B, comprising the option of choosing.Node B then sends the first message option that explanation is chosen to node A.
Fig. 5 illustrates two kinds of operating sequences, is designated as situation A and case B.In situation A, if the call control layer that carrying person's layer is described in the above is subject to consulting impact, node A just takes adequate measures at carrying person's layer.For example, node A may need to change the size of supporting the needed pipeline of selected option.Next send first BC message from node A to Node B, needed parameter is described.Node B receives and analyzes the option of choosing, if carrying person's layer is subject to this negotiation impact, just takes adequate measures at carrying person's layer.Then send first BC message from Node B to node C, the needed parameter of carrying person's layer between Node B and the node C is described.
For case B, the sequence of operation of carrying person's layer finishes at node A from node C.Node C analyzes the option of choosing, and takes adequate measures at carrying person's layer, if carrying person's layer is subject to consulting impact.Send first BC message from node C to Node B, which parameter illustrates needs.The option that the Node B analysis is chosen, and take appropriate measures at carrying person's layer, if carrying person's layer is subject to consulting impact.Then send first BC message from Node B to node A, all parameters that need are described.
Be understood that and can select one in situation A and case B, other situation also is fine certainly.For this reason, should be understood that agreement between node A and the Node B can be different from the agreement between Node B and the node C, for example these agreements can be respectively ATM and IP.May need to revise the parameter that carrying person's layer connects between a pair of node, and not need to revise other to the parameter between the node.
Should be understood that above-described negotiations process can be also can be in calling is carried out when setting up calling.Latter event can be that for example the user wishes to start encryption in calling procedure.
This program can reduce counting in the network that needs the change general ability.Particularly, above-described method can be used in to make through the code conversion of the end-to-end calling of a plurality of CC part and counts or the conversion of security algorithm point is counted minimum.This method can be used in the calling by one or more network.
GCN mechanism comprises allows the CC node that starts comprise the priority of option inventory and they, the option that allows end-node utilize the priority of origination node explanation to select its to support.Machinery of consultation above-mentioned is useful when just holding consultation between two CC nodes.Here the change of suggestion expands to GCN mechanism the situation that plural CC node is arranged in the negotiation.That is to say, call out through belonging to a plurality of CC nodes of one or more telecom operators.This change relates to the following sequence of operation:
1. option inventory and priority data that the CC node that starts is supported it send to each node.
2. the option inventory received of the CC node analysis of process, the option that deletion is not supported from this inventory is transmitted to next node with this inventory.
3. option inventory and the priority received of terminating CC node analysis is selected the option with limit priority that its supports.
If carry out Lawful Interception, Lawful Interception point (node of namely monitoring) thus safety and the coding characteristic that can receive user plane data can monitored calls.
For the new architecture shown in Figure 1 of suggestion, call control protocol wherein is independent of transmission mechanism, and TICC is necessary for to call out and carries out codec negotiation before the user-plane transmissions connection is set up.Reason is that the amount of the needed transfer resource of support call depends on the codec (result who namely depends on the codec negotiation process) of choosing for this calling.In some cases, select a codec for calling out at the very start, but because change has occured environment, must change codec in the latter half of calling out.Two kinds of situations that this situation can occur are:
1) in order automatically or on the basis of calling party's input to provide notice or call redirection to interact with intelligent network (IN) to the callee.Must select first codec that notice is provided.Then call out and shift/redirect to an other side, use second codec.
2) (CFNR) shifted in no-reply call, and it is a kind of so-called auxiliary activities.At first between A and B, negotiate first codec, then this calling is transmitted to C, because B fails to reply in predetermined time in length.On the basis of the needs of C, need second codec.
Obvious superincumbent situation 1) and 2) in, and in other relevant situation, must set up a call connection at transmission mechanism according to the codec of selecting at first and transmit notice, tone etc.When changing codec subsequently, need to revise call connection and support new codec.
Below with reference to Fig. 6, the signaling procedure for the network that utilizes the TICC agreement is described, it can set up the end-to-end call connection for audio call, and call source wherein is signaling node A ad initio, passes at first first Node B or signalling point.This is called out and is passed to subsequently some other terminating signalling point node C.Here the process of explanation relates to the activation of intelligent network business, calling party wherein connects with an intelligent network network node at first, it plays one section message of prerecording to the calling party, then just give last terminating signalling point with this call-delivery, perhaps give CFNR professional, calling is transferred to a new terminating signalling point when the callee who connects with initial terminating signalling point fails answering call in this case.
This signaling sequence may further comprise the steps:
1. node A is established to the calling of Node B.For codec X is selected in this calling.
2. utilizing the transfer resource that is suitable for selected codec to set up transmission between node A and Node B connects.
3. Node B will be called out and be shifted/redirect to node C.Node C does not support codec X and selects codec Y.
4. Node B requesting node A selects the codec of this calling to change over codec Y from codec X.
5. if necessary, the transmission of revising between node A and the Node B connects, to adapt to codec Y.Fig. 6 has illustrated at forward and has connected the both of these case of making amendment and transmitting connection in reverse modification to transmitting.
6. setting up the transmission that is suitable for codec Y between Node B and node C connects.
7.TICC set up calling (TICC ACM+TICC ANM).
TICC is based upon on the ISUP basis, so the signaling message title derives from ISUP.But ISUP does not comprise codec negotiation, does not comprise the codec update routine yet, therefore needs a new TICC message (TICC revises request/affirmation) to provide codec to revise ability.
Obviously, Fig. 6 has just illustrated the modification that node A is connected to forward between the Node B and the transmission of being connected, but at forward be connected the transmission connection modification that also can carry out other.Also have, can also can oppositely set up the transmission connection at forward.
Mechanism described herein can be used in and set up the audio call connection between the signalling point more than three or node.For example, starting between signalling point node A and the original terminating signalling point Node B and/or between original terminating signalling point Node B and last terminating signalling point node C, one or more is being arranged through node.Can also find out, can will call out from node C and further be transferred to another one signalling point (namely node D).Do like this and need to hold consultation, whether be suitable for node D to determine codec Y, if can not between node A and the Node B and the transmission between Node B and the node C connect and make amendment.This process just can extend to any one new node.
Traditional public switch telephone network (PSTN) is encoded to speech data with digital form, transmits with pulse-code modulation (PCM) mode.On the other hand, the digital mobile telephone network network is used more advanced coding techniques, and for example CELP and adaptive multi-rate (AMR) coding is compared with pulse-code modulation, and it can realize higher compression ratio.In many mobile networks, the Code And Decode of voice is finished in portable terminal.If calling is to carry out between two portable terminals registering in same network, just can be from end-to-end transfer encoding speech data.
If calling out is the terminal that mails to the user of " outside " network among mobile networks from the portable terminal of registering, the end-to-end transmission of coded voice data just might be not all right, and concrete condition depends on external network that the mobile network that starts is coupled together with external network or the actual conditions (situation for call connection externally-originated network also is like this) of all go-betweens.
Consider telecommunication system shown in Figure 7, wherein drawn two third generation universal mobile telecommunications system (UMTS) network 1 and 2, they are connected to each other by a traditional public switch telephone network/ISDN networks 3.In the network of universal mobile communication system 1 and 2 each comprises the universal mobile telecommunications system terrestrial radio access network (UTRAN) 4 of network controller (RNC) 5 and base station (BTS) 6.UTRAN 5 is at portable terminal (not drawing) and carry out transmitting between the mobile switching centre (MSC) 7 of call connection the compressed voice data.
Lets call is derived from a user of one of network of universal mobile communication system 1, is a user of mailing to another one network of universal mobile communication system 2.Utilize corresponding process node 8 to provide connection by public switch telephone network 3 for this calling, one of them node is the gateway mobile switching centre (GMSC) of network of universal mobile communication system 1 and 2.Point out as top, public switch telephone network 3 utilizes pulse code modulation that speech data is encoded.All speech datas by public switch telephone network 3 transmission are that the form that majority of network can be understood is very important.For example, allow public switch telephone network 3 operator notice can be inserted an audio call, realize voice alert service etc., and allow the operator of public switch telephone network 3 for the security purpose supervising connections for calling, it is necessary doing like this.Therefore data are passed to before the public switch telephone network 3, it is necessary in the gateway mobile switching centre 8 of network of universal mobile communication system 1 and 2 speech data being carried out " code conversion ", namely speech data is become the pulse-code modulation form from mobile network's speech coding format conversion.Equally, the pulse-code modulation data received of gateway mobile switching centre 8 must convert suitable mobile network's speech coding form to.
The code conversion meeting consumes General Mobile switching center 8 considerable processing resources, but also can cause obvious voice quality to descend.In order to address this problem at least in part, the voice of introducing in the General Mobile switching center 8 without tandem equipment (TFO) can be connected.The speech data of output is continued to convert to the pulse-code modulation mode, but the lowest order of each pulse-code modulation sample " is stolen " without the tandem equipment.The peculiar enough bandwidth of the ratio of stealing from channel (namely 8kbps) are transmitted original coded data.Re-assembly coded data at the terminating network of universal mobile communication system without the tandem equipment, be transmitted to relevant UTRAN, abandon simultaneously the pulse-code modulation data (until it is revised by public switch telephone network, for example passing through to add operator notification) of receiving.In this way, so that public switch telephone network 3 can use the pulse-code modulation data, can effectively to coded voice data carry out end-to-end transmission simultaneously without tandem work.
If the middle device in public switch telephone network/integrated services digital network changes the pulse-code modulation bit stream, without detecting this variation in the tandem equipment, and " get back to " and transmit the pulse-code modulation encoded voice between without the tandem equipment, that is to say that they no longer transmit compressed speech data.
The audio coder ﹠ decoder (codec) that the mobile network can use depends on which type of network it is, might depend on that also which type of terminal is the terminal of using this network be.Obviously, the end-to-end use of single codec can only be when two networks can both use identical codec.Suppose the gateway mobile switching centre of two mobile communications networks until which type of ability the codec of their belonging networks has, they just can be held consultation, and find the codec that can both accept.In ETSI suggestion GSM 08.62 (version 7.0.0 announced in 1998), provided suitable agreement.
A problem can occur when attempting realizing without tandem work in the sort of mobile network shown in Figure 7, be positioned at mobile network's edge this time without the tandem equipment, namely be positioned at UTRAN outside (traditional is positioned at radio access network without the tandem equipment).For in these networks without between the tandem equipment, the codec without consulting between tandem equipment and the radio access network comes exchange message without any way at present.
Fig. 8 has drawn an improved system architecture, wherein the gateway mobile switching centre of two network of universal mobile communication system combines without tandem equipment 9, and Fig. 9 then illustrates in the corresponding universal mobile telecommunications system mobile telephone network and sets up the signaling of calling out between two nodes.
Call set up signaling in the network of universal mobile communication system is carried out calling out control (for example TICC) layer, and initial address message (IAM) starts call setup by sending first from mobile switching centre to relevant gateway mobile switching centre.This initial address message utilizes general ability to consult the number of parameters that (GCN) mechanism is determined call connection.Particularly, IAM comprises an inventory of the codec that the network of universal mobile communication system that starts is supported, also comprises first-selected codec information.A codec is selected by the gateway mobile switching centre that starts from the codec inventory that sends, and tells mobile switching centre with its selection in message (codec 1 is selected).Then, connect to support the codec chosen with enough bandwidth at carrying person's layer.
In order to carry out end-to-end codec negotiation, suggestion is added GCN in the ISDN User Part to.This end-to-end codec negotiation meeting is so that end points uses the possibility of identical codec maximum.If end points uses same speech coding algorithm, just can not reduce speech quality because of unnecessary code conversion by pulse-code modulation network delivery compressed voice without tandem work.So just can by make support compressed voice start and terminating network in carrying person's minimum number of needing save transmission (for example AAL2 or IP carrying person are transmitted).
How Fig. 9 explanation utilizes GCN enhancement mode isup message to transmit signaling between two network of universal mobile communication system.In the terminating network of universal mobile communication system, utilize TICC to send an IAM from gateway mobile switching centre to mobile switching centre.Mobile switching centre accepts codec 1 in this case, and reuses TICC and tell gateway mobile switching centre with this point.So, setting up carrying person's layer at the terminating network of universal mobile communication system connects.Public switch telephone network is accepted the gateway mobile switching centre that this situation is told originators with codec.Because the codec of initial suggestion is accepted, connect so there is no need in the network of universal mobile communication system that starts, to change carrying person's layer at all.If but changed codec, just must tell mobile switching centre this situation from originators gateway mobile switching centre, thereby can revise the old connection of carrying person, for example increase the bandwidth that connects.In Fig. 9, ACM has drawn an address and has finished message, and ANM has drawn a response message.
Figure 10 illustrates second embodiment of the present invention.This scheme depends on optional codec mismatch solution and detects incompatible codec without the optimizer in the tandem work agreement.When detecting incompatible codec without the tandem equipment, it just triggers a codec update routine and revises the codec that terminal is used.Provide the rule (namely selecting which codec) that solves the codec mismatch problems without tandem work.Trigger subsequently the TICC signaling without tandem work agreement and revise the codec of calling out use, thereby make the codec of two terminals compatible.The network of universal mobile communication system that starts the at first codec of suggestion changes and can requirement revise carrying person's layer connection of setting up in two network of universal mobile communication system.
Above-described embodiment can make because the phonetic code conversion that there is no need that middle pulse-code modulation network causes is minimum, simultaneously so that the optimum allocation of user plane equipment (for example code conversion unit) and/or user-plane resources (for example bandwidth) becomes possibility with the service layer that supports certain calling in the public telecommunication network.
In the existing network of supporting the pulse-code modulation coded speech and new network, need to consult codec in order to make the code change that there is no need in the voice path minimum.When the calling of universal mobile telecommunications system and the user of global mobile communication system decline that their voice quality can not there is no need when supporting the existing pulse-code modulation core network without tandem work.When GCN mechanism is introduced the TICC agreement, probably realize (APM user) with a kind of clearing method.
Those of skill in the art can understand and can carry out various modifications and can not depart from scope of the present invention above-described embodiment.

Claims (5)

1. signalling point, be used for telecommunication system in another one signalling point consultation call ability, calling control wherein and carrying person's key-course are by independently agreement control, this signalling point comprises:
Be used on call control layer the parts to terminating signalling point or signaling transfer point transmitting capacity preference or preference priority inventory; And
Be used at the parts of call control layer reception from the approval of the ability of terminating signalling point or signaling transfer point, the preference that signalling point sends if terminating signalling point or signaling transfer point acceptance are started is with regard to the approval of transmitting capacity;
If wherein the selection of call control layer ability had influence on carrying person's key-course, described signalling point is by notice carrying person key-course, and the selection of the ability of the described call control layer is made a response.
2. the media gateway controller of a telecommunication system, calling control wherein and carrying person's key-course are by independently agreement control, and this device comprises:
Be used for the parts from a reciprocity media gateway controller receiving ability preference or preference priority inventory, wherein said ability preference or preference priority inventory with will be relevant in the connection that telecommunication system is set up;
Be used for communicating with media gateway by the control of media gateway controller, with the parts of the availability of the preference determining to be received at the media gateway; And
According in the determined availability of media gateway, ability preference approval message is returned the parts of described reciprocity media gateway controller.
3. the media gateway of a telecommunication system, calling control wherein and carrying person's key-course are by independently agreement control, and this device comprises:
Be used for the parts from media gateway controller receiving ability preference or preference priority inventory, wherein said ability preference or preference priority inventory with will be relevant in the connection that telecommunication system is set up,
Select the parts of preference according to the availability of the preference on the media gateway; With
Be used for sending selected preference to the parts of described media gateway controller.
4. the method for the media gateway controller of an operating telecommunication system, calling control wherein and carrying person's key-course are by independently agreement control, and the method comprises the following steps:
From a reciprocity media gateway controller receiving ability preference or preference priority inventory, wherein said ability preference or preference priority inventory with will be relevant in the connection that telecommunication system is set up;
Communicate with the media gateway by media gateway controller control, with the availability of the preference determining on the media gateway, to be received; And
According in the determined availability of media gateway, ability preference approval message is returned described reciprocity media gateway controller.
5. the method for the media gateway of an operating telecommunication system, calling control wherein and carrying person's key-course are by independently agreement control, and the method comprises the following steps:
From media gateway controller receiving ability preference or preference priority inventory, wherein said ability preference or preference priority inventory with will be relevant in the connection that telecommunication system is set up,
Availability according to the preference on the media gateway is selected preference; And
Send selected preference to described media gateway controller.
CN2010101570358A 1999-05-17 2000-05-09 Capability negotiation system, apparatus and method in a telecommunications network Expired - Lifetime CN101917745B (en)

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GB9911441.5 1999-05-17
GB9911441A GB2350257A (en) 1999-05-17 1999-05-17 Capability negotiation in a telecommunications network
GB9914654A GB2351414A (en) 1999-06-22 1999-06-22 Call set-up in a telecommunications network
GB9914654.0 1999-06-22
GB9914700.1 1999-06-23
GB9914700A GB2351416B (en) 1999-06-23 1999-06-23 Negotiating telecommunications protocol options
GB9915366A GB2352127A (en) 1999-07-02 1999-07-02 Speech coding in a telecommunication system
GB9915366.0 1999-07-02
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GB9921647A GB2350261A (en) 1999-05-17 1999-09-15 Capability negotiation in a telecommunications network

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