WO1997047156A2 - Communication system comprising a network and call processor - Google Patents
Communication system comprising a network and call processor Download PDFInfo
- Publication number
- WO1997047156A2 WO1997047156A2 PCT/GB1997/001528 GB9701528W WO9747156A2 WO 1997047156 A2 WO1997047156 A2 WO 1997047156A2 GB 9701528 W GB9701528 W GB 9701528W WO 9747156 A2 WO9747156 A2 WO 9747156A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- network
- call
- end stations
- controller
- communication system
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/30—Peripheral units, e.g. input or output ports
- H04L49/3081—ATM peripheral units, e.g. policing, insertion or extraction
-
- 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
- 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
- H04L2012/5614—User Network Interface
- H04L2012/5615—Network termination, e.g. NT1, NT2, PBX
-
- 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
- H04L2012/5614—User Network Interface
- H04L2012/5616—Terminal equipment, e.g. codecs, synch.
-
- 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
- H04L2012/563—Signalling, e.g. protocols, reference model
Definitions
- the invention relates to a communication system and is particularly concerned with communication systems for handling voice and video communications.
- a communication system comprises a network connecting two or more end stations and operating in accordance with a network protocol to make and break connections between the end stations; and a call controller connected to the network, the call controller being responsive to call handling requests to generate instructions which cause the network to carry out the call handling requests while operating in accordance with the network protocol.
- the invention separates the primary low level connection features of a network, which consist essentially of the ability to make and break a connection between end stations, from higher level functions.
- the call controller is able to instruct the network or end stations to generate an appropriate combination of primitive make and break instructions so as to effect a call handling request.
- This enables the communication system to emulate a conventional voice communication system, for example, such as a PABX, which conventionally provides the user with a wide range of call handling facilities such as call transfer, call back and the like.
- the call controller will comprise a central unit but in some applications, more than one call controller could be provided, for example each call controller being associated with a local group of end stations. In a further example, the call controller could be distributed amongst all the end stations thus allowing the end stations to establish overlaid signalling channels to one another directly. In that case, the end stations will each contain software which implements higher level functions through a sequence of make-connection and break- connection commands to the network, under control of the overlaid signalling passing through the overlaid signalling channels which they establish between them.
- each active end station is permanently connected for message communication with the call controller although in some cases, in particular where the call controller is distributed amongst the end stations, the end stations are only connected to the call controller for exchange of call handling requests when a call handling request needs to be passed.
- the low level instructions to make or break connections from the call controller will be directed to one or more of the end stations but in some cases, the instructions could be directed to part of the network itself such as a network switch.
- the network can comprise any conventional communication network, primarily adapted for use as a local area network, for example an ATM network.
- the call handling requests from the call controller will typically include one or more ATM addresses of end stations together with a make/break connection instruction.
- token ring addresses are passed.
- the end stations will typically comprise data/voice processing apparatus such as a PC but may also include transfer devices such as gateways to other communication systems. In particular, this allows the communication system to be connected to other voice communication systems such as the public switched telephone network.
- a call controller for connection to a network of a communication system according to the first aspect of the invention, the call controller comprising processing means responsive to call handling requests to generate and convey suitable instructions to the network to cause the network to carry out the call handling requests while operating in accordance with the network protocol.
- a communication system comprises a network connecting two or more end stations and operating in accordance with a network protocol to make and break connections between the end stations, each end station including at least one information handling device; and a device controller for controlling the connection and configuration of the information handling devices both within and between the end stations.
- the device controller prefferably select particular information handling devices from the same or different end stations to process data in accordance with a particular data processing requirement.
- the information handling devices comprise any device which is capable of sending, receiving, or both sending and receiving, information traffic such as multimedia traffic. Examples include voice and video cards, network interface cards, a camera and a video screen.
- the third aspect of the present invention is particularly suited for use with the first and second aspects of the invention since this allows a call connection to be set up which takes account of changes in format of data generated at one end station and received at another end station as well as allowing the devices within an end station to be selected depending upon the type of data being transmitted.
- the device controller can select one or more devices within the end station for handling the particular type of data (voice or video) which is being transmitted.
- a data compression device could be provided connected to the network, through which data is routed by the device controller, but which is located at an end station which does not itself initiate or receive calls.
- the device controller will include a store which contains information indicating for each end station the devices available so that the device controller can determine what devices are available at each end station involved in a connection and thus configure appropriate selections of devices.
- the information in the store may be updated dynamically as devices register and deregister with the device controller.
- FIG. 1 is a schematic diagram of an example of a communication system; and, Figure 2 is a schematic diagram illustrating the remote control of local devices.
- the communication system shown in Figure 1 comprises a number of end stations of which four 1-4 are shown. Each end station is connected to an ATM network 5 of conventional form and so the details are not shown in Figure 1.
- the end stations 1-3 have a similar construction. Each of the end stations 1-3 comprises a voice handling card IA, 2A, 3A connected to a telephone handset IB, 2B, 3B.
- a keyboard 1C, 2C, 3C is connected to an input interface ID, 2D, 3D.
- the voice card IA, 2A, 3A and input interface ID, 2D, 3D are connected to a network interface card IE, 2E, 3E each of which is connected to the network 5.
- the components IA, ID, IE are mounted within a PC having a processor IF.
- the end stations 2,3 have processors 2F and 3F.
- the end station 4 comprises a wide area network (WAN) gateway which connects the network 5 with another network 6 such as a PSTN which provides communication to a large number of telephones such as a telephone 7.
- WAN wide area network
- a central call controller 8 is provided which communicates with the network 5 and thus with the end stations 1-4.
- the call controller 8 includes a processor 9 and a store 10.
- each active end station connected to the network 5 that is any end station which is able to receive or transmit calls, maintains an open channel of communication with the central controller 8 via the network 5. Physically, this channel of communication will be via a single connection from the end station to the network 5 although logically this channel must be distinguished from a channel which will be opened to carry voice or video data as will be described below. In this example, we will consider a call to be made between a user at end station 1 and a user at end station 2.
- the user at end station 1 enters an address, such as a telephone number, through the keyboard 1C of end station 2. This address is conveyed via the interface ID and interface IE through the network 5 along the open message channel to the central controller 8.
- the central controller 8 receives the message and determines that the user at end station 1 wishes to open a voice communication channel with the user at end station 2.
- the processor 9 determines the ATM address of the end station 2 and transmits this address back to the end station 1 together with an instruction to cause the processor IF to construct an ATM message which will open a voice channel with the end station 2. This process will be conventional and utilise a conventional ATM protocol.
- the user at end station 1 can speak to the user at end station 2 via the network 5 with speech data being passed using the ATM protocol, the central controller playing no part in this communication.
- the termination of the call will be notified back to the controller 8 which maintains a continuous monitoring of the performance of all the end stations attached to the network 5.
- the controller 8 will then issue an instruction to the end station to terminate the voice channel with the end station 2 using the ATM protocol.
- the advantage of the invention lies in the ability for permitting users of the end stations to request higher level functions other than simple make and break connection. For example, consider the situation in which the user of end station 1 wishes to transfer his call so that the user at end station 2 is connected to the user at end station 3. To achieve this, the user at end station 1 enters a "transfer call" instruction through the keyboard 1C which is transmitted through the message channel to the central controller 8.
- the central controller 8 then instructs the end station 1 to break the connection with the end station 2 and instructs the end station 2 to make a connection via the ATM protocol with the end station 3.
- the call then continues between the end stations 2 and 3. It is important to recognise that the network infrastructure does not need to understand “transfer” as a function, even in its external interfaces, but merely needs to provide make and break connection primitives.
- the connection of a call was carried out by the end station 1 which had initiated the call connection instruction.
- the central controller 8 could instruct the end station 2 to make the connection with the end station 1.
- the controller 8 could instruct a switch within the network 5 to make connections with each of the end stations 1,2. This is sometimes known as "proxy signalling" within ATM.
- proxy signalling within ATM.
- a single, central controller 8 is provided, more than one central controller could be used, particularly where there are groups of end stations in geographically remote locations.
- the end stations will then contain the software which implements higher level functions through a sequence of make-connection and break- connection commands to the network infrastructure, under control of the overlaid signalling passing through the overlaid signalling channels which they establish between them.
- the controller 8 will treat this in a similar way to the other end stations but where a call is to be connected from one of the end stations 1-3 through the gateway 4 to the network 6, the central controller 8 will initially notify the gateway 4 to expect a call and the address of the final destination. Once the gateway 4 has determined that the final destination has been accessed, it will then notify the central controller 8 which in turn will notify the originating end station to set up a connection between itself and the gateway 4 using the ATM protocol.
- each end station is treated as a single unit by the controller 8.
- controller 8 controls individual devices within the end stations.
- local interfaces exist to allow manipulation of the device. Examples of such devices would include a sound- card; a video camera; and compression hardware.
- “Device control” consists of the ability to address these local device APIs. The basic primitives of device control are:
- a network- interface device is simply another device. When it creates a source it is collecting a traffic stream from the network, and conversely when it creates a sink it is delivering a traffic stream to the network. It's "make source” and “make sink” primitives may be parameterised by the remote network address to which it is to attach for the purposes of sending and receiving data respectively.
- a particular network end station may have several network-interface devices (indeed, they can be added and removed dynamically, as can other devices) , and hence can have several network addresses.
- the network-interface is not a privileged device but simply one among several.
- the control of devices is to be done remotely, by a centralised server resource.
- This server could be implemented in a distributed manner, but logically it is a central resource sitting at the centre of the network.
- Control server 8 Devices, including network-interface devices, make themselves known to the control server 8. This registration process conveys to the control server the type of the device, and also subsequently permits messages to travel between the call control server and the network stations. These messages can contain instructions for the control of the registered device(s) at the given network station.
- devices When devices register with a control server, they will be assigned to a particular user or group of users. This may be done on the basis of information provided by the device software, or by preconfigured information at the server, or both.
- FIG. 2 illustrates in a schematic block diagram form the logical arrangement of devices and control.
- an end station is shown as comprising video software 20, sound software 21 and network traffic streaming software 22.
- These software components 20-22 are connected to a local traffic stream passing system 23.
- Each software unit is also connected to a message delivery system 24 which passes messages from the central controller (not shown) .
- These messages arrive in a similar manner to that shown in Figure 1 through the network and thus through a network interface card 25, a network protocol stack 26 and a message passing layer 27.
- the central controller 8 is able to select which of the software units 20-22 is to be used and in what manner (i.e. as a sink or source) .
- the central controller 8 When local device control is used in conjunction with the call control system described with respect to Figure 1, a wide variety of different call connection functions can be set up by the central controller 8. Thus, when a call is requested, the central controller will instruct the connection of the call using its own rule system by manipulating the many local devices registered with it. The central controller may choose which devices it wishes to use during a call on any criteria it desires, including, but not only, making the best quality connection, making a connection of lowest cost, load balancing between different routes, taking note of which devices belong to users in the call and requests for a particular type of connection from the user.
- call control applications which asks for calls to be made and for things to be done to calls
- devices including network-streaming software, which are manipulated by the central controller to form the initiation of the call.
- a single network protocol stack 26 is shown. However, there could be more than one protocol stack providing links with different networks such as A to and Ethernet and these links could be through separate network interface cards or through a single card, for example in the case where an ATM network can be operated in the native mode and also while emulating TCPIP protocol.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Communication Control (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10500339A JPH11510984A (en) | 1996-06-07 | 1997-06-06 | Communication system including network and call processor |
EP97925156A EP0843947A2 (en) | 1996-06-07 | 1997-06-06 | Communication system comprising a network and call processor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9611886.4A GB9611886D0 (en) | 1996-06-07 | 1996-06-07 | Communication system |
GB9611886.4 | 1996-06-07 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1997047156A2 true WO1997047156A2 (en) | 1997-12-11 |
WO1997047156A3 WO1997047156A3 (en) | 1998-02-19 |
Family
ID=10794876
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1997/001528 WO1997047156A2 (en) | 1996-06-07 | 1997-06-06 | Communication system comprising a network and call processor |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0843947A2 (en) |
JP (1) | JPH11510984A (en) |
CA (1) | CA2225532A1 (en) |
GB (1) | GB9611886D0 (en) |
WO (1) | WO1997047156A2 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0315158A2 (en) * | 1987-11-02 | 1989-05-10 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for controlling terminals on communication network |
EP0421779A2 (en) * | 1989-10-06 | 1991-04-10 | Matsushita Electric Industrial Co., Ltd. | Communication device |
EP0423730A2 (en) * | 1989-10-17 | 1991-04-24 | Matsushita Electric Industrial Co., Ltd. | Electronic device with data transmission function |
EP0641133A2 (en) * | 1993-08-27 | 1995-03-01 | AT&T Corp. | Multimedia call configuration system |
-
1996
- 1996-06-07 GB GBGB9611886.4A patent/GB9611886D0/en active Pending
-
1997
- 1997-06-06 WO PCT/GB1997/001528 patent/WO1997047156A2/en not_active Application Discontinuation
- 1997-06-06 JP JP10500339A patent/JPH11510984A/en active Pending
- 1997-06-06 CA CA002225532A patent/CA2225532A1/en not_active Abandoned
- 1997-06-06 EP EP97925156A patent/EP0843947A2/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0315158A2 (en) * | 1987-11-02 | 1989-05-10 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for controlling terminals on communication network |
EP0421779A2 (en) * | 1989-10-06 | 1991-04-10 | Matsushita Electric Industrial Co., Ltd. | Communication device |
EP0423730A2 (en) * | 1989-10-17 | 1991-04-24 | Matsushita Electric Industrial Co., Ltd. | Electronic device with data transmission function |
EP0641133A2 (en) * | 1993-08-27 | 1995-03-01 | AT&T Corp. | Multimedia call configuration system |
Non-Patent Citations (4)
Title |
---|
LYNDON Y ONG ET AL: "CENTRALIZED AND DISTRIBUTED CONTROL FOR MULTIMEDIA CONFERENCING" PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC), GENEVA, MAY 23 - 26, 1993, vol. 1 - 2 - 03, 23 May 1993, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages 197-201, XP000371092 * |
MUKASA T ET AL: "PROPOSALS OF CALL MODELING FOR INTELLIGENT NETWORK OVER BROADBAND ISDN" GLOBECOM '95. IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE, SINGAPORE, NOV. 14 - 16, 1995, vol. 2, 14 November 1995, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages 1265-1271, XP000622991 * |
PENKLER D M ET AL: "EVOLVING OPEN INTELLIGENT NETWORKS FOR GLOBAL AND BROADBAND SERVICES" ANNUAL REVIEW OF COMMUNICATIONS, vol. 48, 1 January 1994, pages 557-569, XP000543205 * |
WAN-TEH CHANG ET AL: "CALL PROCESSING AND SIGNALING IN A DESKTOP MULTIMEDIA CONFERENCING SYSTEM" COMMUNICATION FOR GLOBAL USERS, INCLUDING A COMMUNICATIONS THEORY MINI CONFERENCE ORLANDO, DEC. 6 - 9, 1992, vol. 1 - 2 - 03, 6 December 1992, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages 225-229, XP000357789 * |
Also Published As
Publication number | Publication date |
---|---|
GB9611886D0 (en) | 1996-08-07 |
WO1997047156A3 (en) | 1998-02-19 |
JPH11510984A (en) | 1999-09-21 |
CA2225532A1 (en) | 1997-12-11 |
EP0843947A2 (en) | 1998-05-27 |
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