EP1021006A2 - Réseau de télécommunication - Google Patents

Réseau de télécommunication Download PDF

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Publication number
EP1021006A2
EP1021006A2 EP99440365A EP99440365A EP1021006A2 EP 1021006 A2 EP1021006 A2 EP 1021006A2 EP 99440365 A EP99440365 A EP 99440365A EP 99440365 A EP99440365 A EP 99440365A EP 1021006 A2 EP1021006 A2 EP 1021006A2
Authority
EP
European Patent Office
Prior art keywords
sub
center
transmission channels
transmission
centers
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.)
Withdrawn
Application number
EP99440365A
Other languages
German (de)
English (en)
Other versions
EP1021006A3 (fr
Inventor
Gert Grammel
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.)
Alcatel Lucent SAS
Nokia Inc
Original Assignee
Alcatel SA
Nokia Inc
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 Alcatel SA, Nokia Inc filed Critical Alcatel SA
Publication of EP1021006A2 publication Critical patent/EP1021006A2/fr
Publication of EP1021006A3 publication Critical patent/EP1021006A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/76—Wired systems
    • H04H20/77—Wired systems using carrier waves
    • H04H20/78—CATV [Community Antenna Television] systems

Definitions

  • the invention relates to a point-to-multipoint transmission network according to the preamble of claim 1.
  • a point-to-multipoint transmission network usually has a central office from which information is transmitted to several sub-centers. Several end points are connected to the sub-centers.
  • a typical point-to-multipoint transmission network is, for example Cable television distribution network, in which television signals from a central, the So-called head station to a variety of terminals to which the television sets the participants are connected, are transmitted.
  • Point-to-multipoint transmission networks are also increasing made back channel capable, so that bidirectional transmissions possible are. E.g. becomes a return channel for implementing service request, the so-called service on demand or telephony, the so-called Cable telephony required.
  • a center 0 is with two nodes 1 and 2 connected. Each node is e.g. a so-called access node.
  • the node 1 is with four sub-centers 11, 12, 13, 14 connected.
  • the node 2 is four Sub-centers 15, 16, 17, 18 connected. To each sub-center 11, 12, 13, 14, 15, 16, 17, 18 several end points are connected, for example 8.
  • the center 0 is thus indirect with 64 end points connected.
  • a transmission channel must be provided for each terminal. Consequently 64 transmission channels would have to be provided by the head office.
  • the control center 0 in FIG. 2 contains a cross-connect CC0 and one Processor ⁇ P0.
  • a cross-connect is an electronic component with multiple inputs and multiple outputs, with each input on each output can be switched. Using a cross-connect switching functions can thus be taken over.
  • the Cross-Connect CC0 has 2m inputs and 2m outputs; m is one natural number, in the example 8, and represents the number of Transmission channels. 8 transmission channels are provided to node 1, and another 8 nodes 2.
  • the processor ⁇ P0 is as a microprocessor or as Digital signal processor designed and used to control the cross-connect CC0.
  • the node 1 has a processor ⁇ P1 and a cross-connect CC1.
  • the Cross-Connect CC1 has m inputs and 4k outputs; k is a natural one Number, in example 8.
  • the Cross-Connect CC1 is used by the Central office 0 of a sub-central office 11, 12, 13, 14 connected to node 1 assigned transmission channels so that they the respective Reach sub-center 11, 12, 13, 14.
  • the Cross-Connect is controlled CC1 via the processor ⁇ P1, via a control line, not shown is connected to the processor ⁇ P0 of the control center 0, and from it the receives the necessary information.
  • the cross-connect can e.g. also as Multiplexer be executed.
  • Each sub-center 11, 12, 13, 14 is connected to node 1 via a k Logical transmission line connected line. With everyone Sub-center 11, 12, 13, 14 is one by a fixed wiring Channel permanently assigned to a terminal.
  • Node 2 has a processor ⁇ P2 and a cross-connect CC2 connected to the sub-centers 15, 16, 17, 18.
  • the construction and the Functioning of node 2 in connection with sub-centers 15, 16, 17, 18 is similar to the structure and operation of node 1 in Connection with the sub-centers 11, 12, 13, 14, so that on the above Description is referenced.
  • FIGS. 1 and 2 An 8x32 Cross Connect is required for each transmission channel.
  • Cross Connects are usually executed symmetrically, so that a 32x32 Cross Connect is necessary. However, this leaves 24 Inputs of the Cross Connect are not connected, so that it is not fully utilized is.
  • the object of the invention is to provide an alternative point-to-multipoint To create transmission network.
  • the task is solved by a point-to-multipoint transmission network according to claim 1.
  • the point-to-multipoint transmission network is in particular characterized in that each sub-center each of the n transmission channels provided by the control center are freely accessible and a predetermined assignment of groups of transmission channels predetermined sub-centers did not take place.
  • An assignment of Transmission channels at sub-centers are simple by checking the busy state of a transmission channel and the direct assignment of the transmission channel if it is still unoccupied is.
  • the rigid, predetermined distribution of the available Transmission channels in groups to only certain sub-centers can be accessed in favor of a single pool of Transmission channels, in which all available transmission channels are abandoned. This gives maximum flexibility in assignment and optimal use of the available transmission channels reached.
  • the number of required fluctuates Transmission channels due to the increased number with the center connected end points less, so the number of transmission channels can be easily adapted to the needs.
  • one can Extension of the transmission network by adding more Terminals, e.g. by another sub-center or by another Connection of end points to an existing sub-control center (up to n End points to a sub-center) in a simple manner, e.g. through the provision of further transmission channels by the head office. It is in particular, no change in the topology of the transmission network required, which cause increased costs and interrupt the operation would.
  • Hardware end points can be saved in the node.
  • the 32x32 is omitted Cross Connect in the node. If necessary, it can be replaced by an 8x8 Cross Connect become.
  • the point-to-multipoint transmission network from FIG. 3 includes one Central 0 and several, in the exemplary embodiment eight with central 0 connected sub-centers 11, 12, 13, 14, 15, 16, 17, 18, the Central 0 is suitable, via an interface 2n logical Transmission channels for the transmission of information from the control center 0 to provide to the sub-centers 11, 12, 13, 14, 15, 16, 17, 18, whereby n is a natural number greater than two, in the exemplary embodiment 8.
  • n is a natural number greater than two, in the exemplary embodiment 8.
  • the center 0 is thus indirect with 64 end points connected.
  • a transmission channel for each terminal to provide is a transmission channel for each terminal to provide.
  • all 64 participants of the 64 end stations will never make calls at the same time, so that with suitable interchangeable Allocation of transmission channels also a smaller number of Transmission channels to provide a telephone and / or Data service is sufficient for the 64 end points.
  • On the transmission network therefore finds a concentration from the point of view of the end points, for example of 4: 1 instead, so that the control center 0 therefore only 16 transmission channels for 64 endpoints. This is due to the logical representation of the point-to-multipoint transmission network illustrated in FIG. 4.
  • Each sub-center 11, 12, 13, 14 has a processing device, which is suitable for each of the n via node 1 from the central office 0 to receive provided logical transmission channels.
  • the Processing device transmits a request to the authorized Access to a transmission channel to control center 0.
  • Control center 0 points the respective sub-center 11, 12, 13, 14 an unoccupied Transmission channel from the n provided transmission channels optionally to.
  • Each sub-center 11, 12, 13, 14 is each of the n Transmission channels freely accessible, so that each sub-center 11, 12, 13, 14 each of the n transmission channels can also be assigned without that a predetermined assignment of groups of transmission channels at predetermined sub-centers 11, 12, 13, 14.
  • the control center 0 in FIG. 4 contains one as a cross-connect CC0 trained processing device with 2n inputs and 2n logic Outputs to provide the 2n logical transmission channels.
  • Each Sub-center 11, 12, 13, 14, 15, 16, 17, 18 includes one as a cross-connect trained processing device with n logic inputs to receive the n logical transmission channels and n logical Exits to the end points.
  • the agreement between the Outputs of control center 0 and the inputs of sub-control centers 11, 12, 13, 14, 15, 16, 17, 18 is useful so that each sub-control center 11, 12, 13, 14, 15, 16, 17, 18 access any transmission channel can.
  • the control center 0 contains a processor ⁇ P0 for controlling its cross-connect CC0 and to check the busy status of Transmission channels as well as for the allocation of unoccupied Transmission channels.
  • the processor is, for example, a microprocessor or digital signal processor.
  • the processor ⁇ P0 is suitable for assigning an unoccupied one Transmission channel to a sub-center 11, 12, 13, 14, 15, 16, 17, 18 via two control lines to sub-centers 11, 12, 13, 14, 15, 16, 17, 18 to transmit.
  • Each sub-center 11, 12, 13, 14, 15, 16, 17, 18 includes a processor to control your cross-connect and Receiving the assignment sent from the control center 0.
  • each sub-center 11, 12, 13, 14, 15, 16, 17, 18 has between 1 and k outputs to connect the Cross-Connect with 1 to k Connect end points, where k is a natural number less than or equal to n, e.g. 8th.
  • Switched node 1 Between control center 0 and sub control centers 11, 12, 13, 14 is an optional Switched node 1, which contains a processor ⁇ P1, which is suitable the assignment of unused transmission channels to the sub-centers 11, 12, 13, 14 to be received by the control center 0 and to the To forward sub-centers 11, 12, 13, 14, if necessary by performing a Protocol implementation or adaptation. Furthermore node 1 has optional the possibility of channel 0 occupied by the control center via an internal Switch Cross Connect. This enables a cheap one Sorting / redistribution of the channels for sub-centers 11, 12, 13, 14.
  • control center 0 and sub control centers 15, 16, 17, 18 is an optional Node 2 switched, which contains a processor ⁇ P2, which is suitable the assignment of unused transmission channels to sub-centers 15, 16, 17, 18 to be received from the control center 0 and to the sub-control centers 15, 16, 17, 18 forward.
  • ⁇ P2 a processor
  • the transmission channels are optionally designed as bidirectional channels.
  • the from control center 0 to sub-control centers 11, 12, 13, 14, 15, 16, 17, 18 information to be transmitted is, for example, analog or digital telephone signals and / or data signals.
  • the control center 0 provides logical 2n via an interface Transmission channels for the transmission of information from the control center 0 ready for sub-centers 11, 12, 13, 14, 15, 16, 17, 18; n is one natural number greater than two, e.g. 8.
  • Each sub-center 11, 12, 13, 14, 15, 16, 17, 18 requests authorized access to one of the 2n if necessary Transmission channels at control center 0 on. This is done e.g. by Sending out a bit string containing a frame password, the address of the Sub-center and the number of transmission channels required includes. For example, one connected to sub-center 14 requires Terminal two transmission channels for the transmission of image and Sound signals, e.g.
  • the central 0 has the each terminal via the respective sub-control center 11, 12, 13, 14 one unused transmission channel from the n provided Transmission channels optionally.
  • a predetermined assignment of Groups of transmission channels to predetermined sub-centers 11, 12, 13, 14 does not take place.
  • a resulting assignment could e.g.
  • the end points therefore have the option of a variable number at any time of transmission channels via their sub-control centers at control center 0 to request the transmission channels requested in assigns unused transmission channels and the assignment in one Table noted to provide an overview of the transmission channels used to create, whereupon the transfer can start.
  • the control center switches the affected transmission channels free again.
  • a node 1 can be switched, which e.g.
  • TDM (A) Time Division Multiple Access
  • CDM (A) Code Division Multiple Access. This can bring organizational benefits.
  • the two cross-connects (Node 1, 2) each with 32 logical inputs and 32 logical Outputs, possibly eight cross-connects (sub-centers 11, 12, 13, 14, 21, 22, 23, 24) with 8 logical inputs and 8 logical outputs, eleven Processors (center 0, nodes 1, 2, sub-centers 11, 12, 13, 14, 21, 22, 23, 24) and a cross-connect (control center 0) with 16 logical Outputs are required in the transmission network according to the invention 3 and 4 only eight cross-connects (sub-centers 11, 12, 13, 14, 15, 16, 17, 18) each with 8 logic inputs and 8 logic inputs Outputs, nine processors (control center 0, sub-control centers 11, 12, 13, 14, 15, 16, 17, 18) and a cross-connect (control center 0) with 16 logical Outputs required.
  • This represents a significant saving in hardware represents, whereby the transmission network of Fig. 3 and 4 essential can be manufactured more cost-effectively. Maintenance is also through the Savings simplified.
  • Control center 0 has a Cross Connect CC0 with 32 inputs and 32 outputs and a microprocessor ⁇ P0.
  • the node 1 has one Cross Connect CC1 with 32 inputs and 32 outputs and one Microprocessor ⁇ P1.
  • Central 0 and node 1 are over 32 logical channels connected to each other, which are split into four times 8.
  • On the Participant side is node 1 with a total of 16 sub-centers connected, of which 4 are shown 11, 12, 13, 14. Four sub-centers there are 8 channels available. At each sub-center are maximum 8 end points can be connected. This means that there are 128 indirect end points with the Central 0 connected.
  • the 32x32 Cross Connect CC1 in node 1 is full busy. Each terminal can access 8 transmission channels.
  • the Allocation of transmission channels is flexible as required.
  • the invention can be applied both to electrical Networks as well as applied to optical networks and to hybrid networks become.
  • the fiber optic coaxial cable network can serve as a hybrid network are used, which is already used as a cable television distribution network is used.
  • the center then serves as the head-end station, the sub-centers as optical network terminations.
  • Telephony over the cable television distribution network is also known as Cable Telephony.
  • a numerical example is in particular with respect to FIG. 3 specified.
  • the number of transmission channels from node 1 to the Sub-centers 11, 12, 13, 14 and the number of transmission channels from node 2 to sub-centers 15, 16, 17, 18 is 8 in each case Numbers are selected as examples and can be varied.
  • the number the transmission channels from node 1 to sub-centers 11, 12, 13, 14 does not necessarily have to be the number of transmission channels from node 2 correspond to the sub-centers 15, 16, 17, 18. Both numbers can have different values.
  • the number of transmission channels from Node 1 to sub-centers 11, 12, 13, 14 need not necessarily be the Number of transmission channels from headquarters 0 to node 1 correspond. Both numbers can have different values.
  • So can be the number of transmission channels from node 1 to the Sub-centers 11, 12, 13, 14 both higher and lower than that Number of transmission channels selected from control center 0 to node 1 become.
  • the number of transmission channels from node 2 to the Sub-centers 15, 16, 17, 18 do not necessarily have to be the number of Correspond to transmission channels from headquarters 0 to node 2. Both Numbers can have different values. So the number of Transmission channels from node 2 to sub-centers 15, 16, 17, 18 both higher and lower than the number of transmission channels from headquarters 0 can be selected to node 2.
  • Nodes 1 and 2 then become for example controlled and instructed by the control center 0, channels toggle to cheap assignments between node 1; 2 and Sub-centers 11, 12, 13, 14; 15, 16, 17, 18 to be able to realize.
  • nodes 1 and 2 work independently. You are then, for example suitable, n channels assigned by the control center to m channels toggle; with m not equal to n. For m ⁇ n every node is then in the Location Connection requests from headquarters or sub-headquarters to be rejected if no more channels are available.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Telephonic Communication Services (AREA)
  • Small-Scale Networks (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
EP99440365A 1999-01-15 1999-12-20 Réseau de télécommunication Withdrawn EP1021006A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999101285 DE19901285A1 (de) 1999-01-15 1999-01-15 Punkt-zu-Mehrpunkt Übertragungsnetz
DE19901285 1999-01-15

Publications (2)

Publication Number Publication Date
EP1021006A2 true EP1021006A2 (fr) 2000-07-19
EP1021006A3 EP1021006A3 (fr) 2005-09-21

Family

ID=7894304

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99440365A Withdrawn EP1021006A3 (fr) 1999-01-15 1999-12-20 Réseau de télécommunication

Country Status (6)

Country Link
EP (1) EP1021006A3 (fr)
JP (1) JP2000232445A (fr)
CN (1) CN1261246A (fr)
AU (1) AU6543399A (fr)
CA (1) CA2295467A1 (fr)
DE (1) DE19901285A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107248873B (zh) * 2017-05-31 2019-05-17 西安诺瓦电子科技有限公司 跳频通信方法和油价牌系统

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5136581A (en) * 1990-07-02 1992-08-04 At&T Bell Laboratories Arrangement for reserving and allocating a plurality of competing demands for an ordered bus communication network
US5740075A (en) * 1994-09-12 1998-04-14 Bell Atlantic Network Services, Inc. Access subnetwork controller for video dial tone networks
US5850400A (en) * 1995-04-27 1998-12-15 Next Level Communications System, method, and apparatus for bidirectional transport of digital data between a digital network and a plurality of devices
US6052377A (en) * 1996-05-28 2000-04-18 Matsushita Electric Co., Ltd. Access control method in communication system

Also Published As

Publication number Publication date
EP1021006A3 (fr) 2005-09-21
DE19901285A1 (de) 2000-07-20
JP2000232445A (ja) 2000-08-22
CN1261246A (zh) 2000-07-26
CA2295467A1 (fr) 2000-07-15
AU6543399A (en) 2000-07-20

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