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WO2000079742A1 - Preemption et preseance a plusieurs niveaux dans un reseau separe de commande d'appel et de support - Google Patents

Preemption et preseance a plusieurs niveaux dans un reseau separe de commande d'appel et de support Download PDF

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Publication number
WO2000079742A1
WO2000079742A1 PCT/AU2000/000695 AU0000695W WO0079742A1 WO 2000079742 A1 WO2000079742 A1 WO 2000079742A1 AU 0000695 W AU0000695 W AU 0000695W WO 0079742 A1 WO0079742 A1 WO 0079742A1
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WO
WIPO (PCT)
Prior art keywords
network
termination
indication
properties
mlpp
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/AU2000/000695
Other languages
English (en)
Inventor
Mark Alan Hollis
Leslie Gary Graf
Juan Noguera-Rodriguez
Stephen Christopher Terrill
Christian Norman Groves
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to EP00936562A priority Critical patent/EP1192771A1/fr
Priority to AU52022/00A priority patent/AU5202200A/en
Publication of WO2000079742A1 publication Critical patent/WO2000079742A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • H04Q3/0025—Provisions for signalling

Definitions

  • the present invention relates to signaling in a telecommunications system. More particularly, the invention relates to standardising signalling over multi-vendor telecommunication infrastructures. BACKGROUND TO THE INVENTION
  • non-STM transport technologies e.g. ATM, IP, FR, etc
  • Figures 1 a and 1 b show the evolution from current integrated CC/BC public network protocols (e.g. ISUP) (figure 1a) to the separated CC/BC solution (figure 1b).
  • ISUP integrated CC/BC public network protocols
  • FIG 1a in current public NNI protocols: call and bearer control are integrated inside the same protocol, i.e. each node in the network must have call and bearer control capabilities.
  • FIG 1 b in separated CC and BC call and bearer control are performed by different protocols.
  • a single CC protocol is needed for the various transport technologies (e.g. ATM, IP, etc.). Only some nodes (e.g. nodes at the edge of a network) need to couple the CC and BC, for instance for a specific call, other nodes, only need BC capabilities (e.g. transit nodes inside an operator's network).
  • a new interface is required between the CC function and BC function.
  • a new protocol is also thus required to enable coupling between the CC and BC functions when a node is implemented in a separated environment.
  • the common term for this protocol is a 'Media Gateway Control Protocol', and which is being developed by ITU Study Group 16 (H.248, previously known as H.GCP) (reference: ITU-T H.248, Gateway Control Protocol) and in IETF MEGACO (MGCP) working group (reference: IETF ⁇ RFC2805> Media Gateway Control protocol architecture and requirements).
  • H.248 previously known as H.GCP
  • MGCP IETF MEGACO
  • the CC function is known as 'Media Controller (MC)'
  • the BC function is known as 'Media Gateway (MG)'.
  • Figure 2 shows a Media Gateway Control Protocol in separated CC & BC
  • the Media Gateway Control Protocol describes resources in the BC function in terms of contexts and terminations. Terminations can be reserved and used at a later time.
  • a termination represents a physical endpoint and can be assigned different characteristics, for example: the transport type (Circuit, IP, ATM) media or codec type (GSM, G.711 ) priority
  • a context groups a number of terminations to describe a path or call through the BC function.
  • the MLPP information In today's public telecommunications networks based on ISUP, the MLPP information, which has two parts - precedence and pre-emption, is signalled in Initial Address Messages (IAM), Release Message (REL), Address Complete Message (ACM) and Call Progress Message (CPG).
  • IAM Initial Address Messages
  • REL Release Message
  • ACM Address Complete Message
  • CPG Call Progress Message
  • the Precedence parameter is used to identify the precedence level, the network and MLPP service domain, and whether a path has been reserved or path reservation is allowed. In prior art arrangements, this is handled at the CC level.
  • the MLPP information In the new architecture of separated CC and BC, the MLPP information needs to be also implemented partly at the CC and BC level. If the BC level implements the functionality that is required for MLPP, the Media Gateway Control Protocol needs to be updated to carry to the MLPP information between the CC and BC functions.
  • the Media Gateway Control Protocol today allows a termination to be reserved and assigned and a priority given, however, it does not have the capability to: express that a reserved termination is for 'pre-emption reserved for reuse' express that a termination belongs to an MLPP service domain express that a termination belongs to a certain 'Network Identity' Without the ability to express these parameters, the BC function is considered not able to implement the necessary functionality for the MLPP supplementary service to operate in a separated BC and CC network.
  • An object of the present invention is to alleviate at least one disadvantage of the prior art arrangement.
  • the present invention provides a method of operating a MLPP supplementary service in a separated BC and CC network, in which there is provided in the BC functionality, at least one of the following properties: a) an indication of the termination's membership of a domain or group (i.e. MLPP service domain) b) an indication of why a termination is reserved (e.g. pre-emption reserved for reuse) c) an indication of which network a termination is assigned (e.g.
  • the properties are additional termination properties.
  • the present invention also provides a separated Call Control (CC) and Bearer Control (BC) network, operating a MLPP supplementary service, which includes a means of implementing BC functionality having context and termination, a first indicating means to indicate membership of a domain or group by the termination, a second indicating means to indicate why the termination is reserved, and a third indicating means to indicate to which network the termination is assigned.
  • CC Call Control
  • BC Bearer Control
  • the network above is used in conjunction with a TICC Transport
  • the present invention may be implemented in a UMTS core network.
  • the present invention is based on the realisation that in a new separated architecture, because the CC and BC are split, there is a requirement to provide additional properties, such as termination properties.
  • a further realisation is that in a gateway, the signalling information including protocols can be interworked to a new protocol or the protocol may be transferred through the gateway.
  • the invention stems from recognising that, in interworking or transferring, a number (one or more), commands can be added to enable provision of certain desired properties.
  • the Media Gateway Control Protocol describes several commands to create, modify, subtract and query the properties associated with a termination and/or context. To ensure correct operation of the MLPP supplementary services additional termination properties such as the following can be added:
  • An indication of why a termination is reserved e.g. pre-emption reserved for reuse
  • An indication of which network a termination is assigned e.g. Network
  • the invention can be implemented by way of the following Media
  • Figure 1a illustrates a public network configuration in which call control (CC) and bearer control (BC) protocols are tightly coupled
  • Figure 1 b illustrates a network configuration that allows for splitting of call control(CC) and bearer control (BC) into separated protocols
  • Figure 2 illustrates a Media Gateway Control Protocol in a separated CC & BC architecture
  • Figure 3 illustrates H.248 connection model highlighting Terminations and Contexts. DETAILED DESCRIPTION OF CERTAIN EMBODIMENTS
  • a protocol is required to enable coupling between the CC and BC functions when a node is implemented in a separated environment.
  • the common term for this protocol is a 'Media Gateway Control Protocol'.
  • Figure 2 shows a Media Gateway Control Protocol in separated CC and BC Architecture.
  • the Media Gateway Control Protocol describes resources in the BC function in terms of context and termination. Terminations can be reserved and used at a later time.
  • a termination represents a physical endpoint or resource and can be assigned different characteristics, for example: the transport type (Circuit, IP, ATM) media or codec type (GSM, G.711 ) priority
  • a context groups a number of terminations to describe a path or call through the BC function.
  • a context is an association between a number of terminations. The context describes the topology (who hears/sees whom) and the media mixing and/or switching parameters if more than two terminations are involved in the association.
  • a termination may be removed from a context with a Subtract command, and a termination may be moved from one context to another with a Move command.
  • a termination exists in one and only one context at a time.
  • the maximum number of terminations in a context is a MG property.
  • Media gateways that offer only point-to-point connectivity might allow at most two terminations per context.
  • Media gateways that support multipoint conferences might allow three or more terminations per context.
  • the attributes of contexts are:
  • Context ID • The topology (who hears/sees whom)
  • the topology of a context describes the flow of media between the terminations within a context.
  • the mode of a termination (send/receive/7) describes the flow of the media at the ingress/egress of the media gateway.
  • the priority is used for a context in order to provide the MG with information about a certain precedence handling for a context.
  • the MGC can also use the priority to control autonomously the traffic precedence in the MG in a smooth way in certain situations (e.g. restart), when a lot of contexts must be handled simultaneously.
  • An indicator for an emergency call is also provided to allow a preference handling in the MG.
  • FIG. 3 illustrates three possible services of a connection model suitable for the protocol of figure 2 and is not meant to be an all-inclusive illustration.
  • the asterisk box in each of the contexts represents the logical association of terminations implied by the context.
  • the connections illustrated by paths A, B, C represent, for example, a conference with a 3 party communication.
  • the scenario of paths D & E represent, for example, call hold and the scenario of paths F & G represent a 2 party communication.
  • the examples are not the only scenarios applicable to figure 3 as would be understood by those skilled in the art.
  • the Multilevel Precedence and Pre-emption (MLPP) service needs to be supported by separated CC and BC networks also.
  • the Multilevel Precedence and Pre-emption (MLPP) supplementary service provides a prioritised call handling service. This service has two parts - precedence and pre-emption. Precedence involves assigning a priority level to a call. Pre-emption involves the seizing of resources, which are in use by a call of a lower precedence, by a higher level precedence call in the absence of idle resources. Users in networks that do not support this service will not be affected by this service.
  • the MLPP service is provided as a network provider's option to a domain of a network.
  • the domain can be the whole network or a subset of the network.
  • the MLPP service applies to all network resources in the domain that is in common use.
  • the maximum precedence level of a subscriber is set at the subscription time by the service provider based on the subscriber's need. The subscriber may select a precedence level up to and including the maximum subscribed to precedence level on a per call basis.
  • Precedence calls (MLPP calls that have a higher precedence than the lowest level of precedence) that are not responded to by the called party (e.g. call unanswered and/or unacknowledged, called party busy with call of equal or higher precedence, or called party busy and non-pre-emptable) are diverted to a predetermined alternate party.
  • This alternate party may be another subscriber or a network operating position.
  • Pre-emption may take one of two forms. First, the called party may be busy with a lower precedence call which must be pre-empted in favour of completing the higher precedence all from the calling party. Second, the network resources may be busy with calls some of which are of lower precedence than the call requested by the calling party. One or more of these lower precedence calls must be preempted to complete the higher precedence call. There are at least three characteristics of pre-emption:
  • Any party whose connection was terminated (whether that resource is reused of not) must receive a distinctive pre-emption notification.
  • Any called party of an active call that is being pre-empted by a higher precedence call should be required to acknowledge the pre-emption before being connected to the new calling party.
  • the present invention seeks to incorporate additional termination properties such as: An indication of the termination's membership of a domain or group (i.e.
  • An indication of why a termination is reserved (e.g. pre-emption reserved for reuse)
  • An indication of which network a termination is assigned (e.g. Network
  • Gateway Control Protocol command application programming interface API
  • API Gateway Control Protocol command application programming interface
  • the Media Gateway Control Protocol has a number of network applications including but not limited to:
  • Circuit Switched Networks And could be realised, for example but not limited to, equipment such as: trunking gateways access gateways access servers base stations ⁇ Mobile Switching Centres (MSCs)
  • MSCs Mobile Switching Centres
  • Gateway Mobile Switching Centre (GMSCs) residential gateways transit switches local switches
  • Specific applications of the invention include a UMTS core network, H.323 VoIP and/or SIP (Session initiation Protocol) based VoIP networks.
  • the present invention has application to MLPP used with a TICC or BICC protocol in separated CC and BC networks.
  • Example realisations of the present invention are as shown below. The options are exemplary and not expansive. Thus, other realisations are contemplated within the scope of the present invention.
  • EXAMPLE REALISATIONS Option 1 Add (Termination Id,
  • Terminationld Circuit23/MLPPdomain/NI2.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention concerne la signalisation dans un système de télécommunications. D'une manière spécifique, l'invention concerne la normalisation de la signalisation via des infrastructures de télécommunication hétérogènes. L'invention concerne également un procédé et un système permettant de faire fonctionner un service supplémentaire MLPP dans un réseau séparé de commande de support et d'appel, dont la fonctionnalité de commande de support comporte au moins une des propriétés suivantes: a) une indication de l'appartenance de la terminaison à un domaine ou à un groupe (par exemple, domaine de service MLPP), b) une indication de la raison pour laquelle la terminaison est réservée (par exemple, préemption réservée pour réutilisation), c) une indication du réseau auquel est attribuée une terminaison (par exemple, identité de réseau). De préférence, ces propriétés sont des propriétés de terminaison supplémentaires.
PCT/AU2000/000695 1999-06-23 2000-06-20 Preemption et preseance a plusieurs niveaux dans un reseau separe de commande d'appel et de support Ceased WO2000079742A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP00936562A EP1192771A1 (fr) 1999-06-23 2000-06-20 Preemption et preseance a plusieurs niveaux dans un reseau separe de commande d'appel et de support
AU52022/00A AU5202200A (en) 1999-06-23 2000-06-20 Multilevel precedence and pre-emption in a call and bearer separated network

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPQ1163A AUPQ116399A0 (en) 1999-06-23 1999-06-23 Multilevel precedence and pre-emption in a call and bearer separated networks
AUPQ1163 1999-06-23

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WO2000079742A1 true WO2000079742A1 (fr) 2000-12-28

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AU (1) AUPQ116399A0 (fr)
WO (1) WO2000079742A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003032655A1 (fr) * 2001-10-08 2003-04-17 Telefonaktiebolaget L M Ericsson (Publ) Procede et systeme pour la gestion d'appel dans un systeme de telecommunications
CN1305282C (zh) * 2003-11-13 2007-03-14 中兴通讯股份有限公司 媒体网关和媒体网关控制器内部的预编解码方法
CN1315311C (zh) * 2003-01-28 2007-05-09 华为技术有限公司 传送网关上下文中端点的方法
WO2008006317A1 (fr) 2006-07-06 2008-01-17 Huawei Technologies Co., Ltd. Système et procédé pour accès multiservice
WO2008022576A1 (fr) * 2006-08-11 2008-02-28 Huawei Technologies Co., Ltd. Système de réseau d'accès à commande et transport séparés et procédé de transmission correspondant
CN100477830C (zh) * 2003-10-10 2009-04-08 诺基亚西门子网络两合公司 在“移动终端的源自pstn/isdn”呼叫中使用的传输业务中的反向信令的方法

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WO1999016256A1 (fr) * 1997-09-24 1999-04-01 Bell Canada Procede et appareil d'acheminement d'appels dynamique dans un reseau intelligent
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WO1999005590A2 (fr) * 1997-07-25 1999-02-04 Starvox, Inc. Appareil et procede pour passerelle vocale integree
WO1999016256A1 (fr) * 1997-09-24 1999-04-01 Bell Canada Procede et appareil d'acheminement d'appels dynamique dans un reseau intelligent
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003032655A1 (fr) * 2001-10-08 2003-04-17 Telefonaktiebolaget L M Ericsson (Publ) Procede et systeme pour la gestion d'appel dans un systeme de telecommunications
CN1315311C (zh) * 2003-01-28 2007-05-09 华为技术有限公司 传送网关上下文中端点的方法
CN100477830C (zh) * 2003-10-10 2009-04-08 诺基亚西门子网络两合公司 在“移动终端的源自pstn/isdn”呼叫中使用的传输业务中的反向信令的方法
CN1305282C (zh) * 2003-11-13 2007-03-14 中兴通讯股份有限公司 媒体网关和媒体网关控制器内部的预编解码方法
WO2008006317A1 (fr) 2006-07-06 2008-01-17 Huawei Technologies Co., Ltd. Système et procédé pour accès multiservice
EP2040431A4 (fr) * 2006-07-06 2009-08-05 Huawei Tech Co Ltd Système et procédé pour accès multiservice
US7934004B2 (en) 2006-07-06 2011-04-26 Huawei Technologies Co., Ltd. System and method for multi-service access
WO2008022576A1 (fr) * 2006-08-11 2008-02-28 Huawei Technologies Co., Ltd. Système de réseau d'accès à commande et transport séparés et procédé de transmission correspondant

Also Published As

Publication number Publication date
EP1192771A1 (fr) 2002-04-03
AUPQ116399A0 (en) 1999-07-15

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