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WO2003034777A1 - Procede de commutation dynamique de voies de transmission - Google Patents

Procede de commutation dynamique de voies de transmission Download PDF

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Publication number
WO2003034777A1
WO2003034777A1 PCT/EP2002/011419 EP0211419W WO03034777A1 WO 2003034777 A1 WO2003034777 A1 WO 2003034777A1 EP 0211419 W EP0211419 W EP 0211419W WO 03034777 A1 WO03034777 A1 WO 03034777A1
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WO
WIPO (PCT)
Prior art keywords
frame
time
message
isdn
telephony
Prior art date
Application number
PCT/EP2002/011419
Other languages
German (de)
English (en)
Inventor
Guenther Schauer
Armin Tannhaeuser
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2003034777A1 publication Critical patent/WO2003034777A1/fr

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Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13039—Asymmetrical two-way transmission, e.g. ADSL, HDSL
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13103—Memory
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13106—Microprocessor, CPU
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13174—Data transmission, file transfer
    • 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
    • H04Q2213/13202—Network termination [NT]
    • 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
    • H04Q2213/13215—Code checking, CRC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13216—Code signals, frame structure
    • 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
    • H04Q2213/1332—Logic circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13332—Broadband, CATV, dynamic bandwidth allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1336—Synchronisation

Definitions

  • the subject of the registration relates to a method for operating time-division-based telephony and ISDN data connections with an ATM-based data connection via an SDSL / SHDSL transport system on a subscriber line.
  • telephony connections and / or ISDN connections can be operated simultaneously with data connections on the subscriber line and can be set up and terminated individually and independently of one another.
  • the assignment or withdrawal of the additional channel should not result in data loss in the ATM channel.
  • This principle of intensive use of transmission channels is known as dynamic channel allocation or dynamic rate repartitioning / DRR.
  • the object of the invention is to provide a method which optimizes the second-mentioned method.
  • FIG. 1 shows a division of an SDSL / SHDSL frame
  • FIG. 2 shows three examples of the assignment of time slots in an SDSL / SHDSL frame
  • FIG. 3 shows two examples of a time slot switchover
  • FIG. 4 shows an example according to the invention for a channel assignment and switching procedure between an LT and an NT in normal operation, the time grid for the upstream direction from NT to LT being shown in broken lines.
  • FIG. 5 shows an example according to the invention for a message structure for channel assignment and switching
  • Figure ⁇ > an example according to the invention for a message table
  • Figure 7 shows an example of a frame control unit.
  • Data transport using an SDSL / SHDSL frame is considered for the following considerations.
  • useful information bits, signaling bits and operational bits are transmitted at defined bit positions.
  • FIG. 1 shows the division of an SDSL / SHDSL standard
  • the frame is divided into four useful information blocks PL1, PL2 1 , PL3 and PL4, which are referred to as payload blocks.
  • Each payload block PL1, PL2, PL3, PL4 is in turn subdivided into 12 payload sub-blocks P01 to P12, P13 to P24, P25 to P36 and P37 to P48.
  • Each sub-block can be divided into up to 7 Z-channels with 8 kbit / s each and up to 36 B-channels with 64 kbit / s each.
  • Each Z time slot contains 1 bit position and each B time slot contains 8 bit positions.
  • Signaling bits and operational bits for telephony and ISDN connections can be transmitted in a number of Z time slots and / or adjacent B time slots that is defined as required when the SDSL / SHDSL connection is configured.
  • the information bits of the Bl and B2 channels of an ISDN connection are transmitted in two successive B time slots of an SDSL frame.
  • the digitized signals of the telephony connections are also transmitted in B time slots, with exactly one B time slot being assigned to each telephony connection.
  • the number of telephony B time slots and ISDN B time slot pairs required is also specified when the SDSL / SHDSL connection is configured.
  • the dates of the ATM connections are combined in a further configured number of 64 kbit / s time slots.
  • the total number of B-time slots is determined by the transmission speed of the current SDSL / SHDSL system and, according to the standard, is between 3 and 36 as indicated in FIG. 1.
  • overhead data (data beyond the useful information) are accommodated, which contain individual bit positions for operational information and, with approximately 3.3 kbit / s transport capacity, the eoc channel.
  • the frame contains a 14-bit wide frame word (sync word) for synchronization and finally two bits at the end of the frame to adjust the frame length.
  • the SDSL / SHDSL connection is configured, for example in a so-called handshaking procedure, predetermined numbers of time slots for signaling connections, including operational information, for the telephony connections reserved for the ISDN connections and for a broadband connection, in particular an ATM connection.
  • FIG. 2 shows further examples of such time slot assignments.
  • the first example shows 2 time slots, each with 1 bit (Z time slots) for signaling, 5 additional time slots, each with 8 bits (B time slots) for time-division-based telephony applications, and the remaining time slots for one
  • the next example shows a channel division into the areas of signaling, then ISDN instead of telephony, and still ATM, while the last example shows a simultaneous use of telephony, ISDN and ATM services. Not all reserved telephony and ISDN channels are always occupied during operation. According to the invention, a further method for using the temporarily unoccupied telephony and ISDN time slots is specified below, as a result of which the transport capacity of the ATM connection is increased.
  • Time slots can be temporarily allocated to an ATM-based service. For example, if a telephony subscriber hangs up on the SDSL / SHDSL connection after a call and goes on-hook, the 64 kbit / s time slot that is temporarily no longer required is released for the digitized voice with the command to disconnect the telephony connection. This time slot is directly functionally assigned to the ATM time slot area. This is illustrated in the first example of FIG.
  • the enlarged ATM area does not form a closed time slot block since there is, for example, another active telephony time slot between the preset area and the activated time slot.
  • the B-channel time slot pair of an ISDN connection after it has been released by the command to disconnect the connection, is connected to the ATM area without further routing.
  • time slots or time slot pairs temporarily disconnected from the telephony and ISDN area remain assigned to the ATM area until they are required again in their preset area as a result of a connection request for telephony and ISDN.
  • Commands of the ETSI EN 300 347-1 standard can be used, for example, to initiate the channel assignment procedures for the ATM connection or back into the telephony or ISDN area.
  • FIG. 1 An example according to the invention for an assignment and switchover procedure in normal operation without a transmission-related disruption of the procedure control is shown in FIG. It is controlled on the network side by the SDSL / SHDSL-LT (LT - Line Termination), whereby the subscriber-side NT (NT - Network Termination) has the slave function.
  • SDSL / SHDSL-LT LT - Line Termination
  • NT - Network Termination subscriber-side NT
  • FIG. 5 shows an example according to the invention for the structure of the messages for the assignment and switchover procedure.
  • the messages are organized in bytes. They contain: Byte 1: 4 bits for the message names ("Name”) and 4 bits for the time interval that is required by a frame control unit for the circuit steps to convert to an SDSL / SHDSL frame with a changed channel assignment (framer "setup") , Byte 2: 8 bits for the sequence number ⁇ n> when repeating messages.
  • Bytes 3 to 6 32 bits for the identification of up to 32 time slots for telephony and / or ISDN connections.
  • the order of the bits continuously corresponds to the order of the B-channel time slots in the SDSL / SHDSL frame.
  • B channels temporarily assigned and newly assigned to the ATM area are identified by 1, in contrast channels in 5 of the basic setting for telephony or ISDN or channels to be switched back by 0.
  • Z channels are used to transmit the messages, which are described in the explanation of FIG. 1 are.
  • one or more bytes can be added after the 6th byte to identify further time slots.
  • 3 * 48 bit transmission capacity is required for the 6 20-byte message sent three times.
  • 3 Z channels are required, as described in the explanation for FIG. 1.
  • a Z channel offers 48 bits since each of the 48 sub-blocks contains 1 Z bit in the frame.
  • 2 bytes per message and thus one of the three Z channels are saved. This is advantageous for applications that manage with 16 time slots for telephony and / or ISDN connections.
  • FIG. 6 contains the totality of the messages in a message table. The functions of the messages are explained in the procedure descriptions.
  • FIG. 7 shows an example of a frame control unit in which in particular the current time slot assignment of the frame is processed. The procedure in detail:
  • the procedure is started by the Master LT with Demand ⁇ 1>, cf. Figure 4.
  • Sending and receiving time of the frame with Demand ⁇ 1> define the clock grid for the frames in the downstream direction from LT to NT.
  • NT replies upstream from NT to LT as soon as possible with the message Demand Ack ⁇ 1>.
  • the frame with this message defines the clock pattern upstream in NT and LT.
  • Demand ⁇ 1> identifies in byte 3 and the subordinate bytes of a message the time slots to be switched over or temporarily switched over at this point in time.
  • NT takes over these identification drawings and reflects them : back to LT with Demand Ack ⁇ 1>.
  • the channel assignment for forming the new frame is thus defined at both ends of the SDSL / SHDSL connection.
  • each side must know both changeover times. For this purpose, each side communicates its own changeover or setup time in bit positions 5 to 8 of the first message byte to the opposite side. Each side chooses the longer of the two changeover times as the lead time. The time of transmission of the first downstream frame with a new channel assignment is thus fixed on both sides. In the example of FIG. 4, a frame length was selected for the lead time.
  • NT replies with the message Exee Ack ⁇ 1>.
  • the frame with Exee Ack " ⁇ 1> ' for upstream defines the reference points for the first frame with a new channel assignment, with the same lead time as for downstream.
  • interference immunity the fail-safe property. This is understood to mean that the procedure does not remain in an indefinite intermediate state after line failures, but runs automatically to the end and returns to its idle state. This is shown in detail below.
  • a disturbance affects the progress of the procedure if the disturbance of a frame prevents the majority decision 2 from 3 for a procedure message. If there is no majority decision 2 out of 3 in the disturbed downstream frame with Demand ⁇ 1>, NT remains in the idle state with the message Monitor ⁇ 0>.
  • the first correctly received message Demand ⁇ n> is answered with Demand Ack ⁇ n>.
  • the first correctly received message Demand Ack ⁇ m> is not answered with Exee ⁇ m> but, as in the undisturbed case, with Exee ⁇ 1>, since Exee ⁇ 1> defines the reference and changeover points for the first new frame. This means that the changeover times are only determined when a LT is received in the LT.
  • Demand Ack ensures that NT is ready to carry out the switching process as well. This has the advantage that information loss due to one-sided switching is avoided. One-sided switching is additionally prevented by NT indicating that it may not be ready to carry out the switching process when it detects demand for the first time with the “Demand Nack ⁇ 1> message.
  • the lead time which by definition is downstream with Exee ⁇ 1> and upstream with E-xec Ack ⁇ 1>, is delayed by p - 1 frame lengths activated.
  • Each lead time is always chosen equal to the larger frame changeover time. If the changeover time of the frame control unit in the NT is shorter, the difference to the lead time acts as a buffer: If the Exec delay p - 1 is not greater than this difference, the frame control unit is activated in good time.
  • the frame control unit is activated late, so that the first new downstream frames arriving after the end of the lead time are processed in the NT until the frame control unit is changed over, with the old, that is no longer suitable, time slot assignment, what to Loss of information leads.
  • the frames below then automatically meet the appropriate framer.
  • the required fail-safe condition is thus fulfilled.
  • the same applies analogously to the upstream frames if instead of Exee Ack ⁇ 1> only Exee Ack ⁇ q> is correctly received in the LT.
  • the lead time i.e. the time interval between the reference points defined by Exee ⁇ 1> or E-xec Ack ⁇ 1> and the associated switchover points is greater than the longer changeover time of the frame control units
  • a buffer is obtained for the event a late detection of Exee or Exee Ack due to a fault.
  • the buffer size measured in frame lengths, then specifies how many disturbed Exec frames or Exec Ack frames may occur without disturbing the frame handling. Only additional faulty Exec frames or Exec Ack frames then lead to loss of information before the frame control unit has changed over to the new time slot structure.
  • the procedure runs automatically in the undisturbed final state as required for the fail-safe capability.
  • the processing of almost simultaneously arriving orders for the channel switchover for establishing a connection for a telephony and / or the ISDN connection is further accelerated: the switchover procedure can be interrupted and restarted during the demand phase, in order to include channel switching orders that arrived at short notice and not to delay until the end of the current procedure.
  • the upstream / downstream orientation of the messages is reversed.
  • connection establishment protocols can also be used to initiate the switchover procedure, which are not to be completed in the LT but in the NT.
  • the following advantages are achieved with the present invention compared to the method [3]:
  • the procedure [3] divides the area of the 32 time slots into four parts, which can only be processed in four successive switching procedures.
  • orders that arrive shortly after the start of the procedure in the demand phase can be taken into account immediately by canceling and restarting the procedure.
  • Switch buffer for lossless frame switching in the event of faults In contrast to the present invention, the method [3] does not offer such a buffer.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

L'invention concerne un procédé appelé répartition dynamique de débit ou DRP (Dynamic Rate Repartitioning), qui permet, dans le cadre d'une ligne SDSL/SHDSL d'une liaison DSL correspondante, de commuter des voies de transmission temporairement non utilisées de liaisons téléphoniques ou ISDN sur une liaison ATM simultanément active, afin d'accroître son débit de données. La commutation intervient simultanément au sein de l'émetteur et du récepteur, si l'on ne tient pas compte du temps de propagation sur la ligne de raccordement.
PCT/EP2002/011419 2001-10-12 2002-10-11 Procede de commutation dynamique de voies de transmission WO2003034777A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP01124525 2001-10-12
EP01124525.5 2001-10-12

Publications (1)

Publication Number Publication Date
WO2003034777A1 true WO2003034777A1 (fr) 2003-04-24

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999049608A2 (fr) * 1998-03-25 1999-09-30 Paradyne Corporation Appareil et procede de reaffectation des bandes vocales de multiplexage temporel pour la transmission de donnees
WO2000077991A1 (fr) * 1999-06-15 2000-12-21 Infinitec Communications, Inc. Optimisation de largeur de bande dans un systeme de porteuse a boucle numerique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999049608A2 (fr) * 1998-03-25 1999-09-30 Paradyne Corporation Appareil et procede de reaffectation des bandes vocales de multiplexage temporel pour la transmission de donnees
WO2000077991A1 (fr) * 1999-06-15 2000-12-21 Infinitec Communications, Inc. Optimisation de largeur de bande dans un systeme de porteuse a boucle numerique

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
"G. 994.1 Handshake procedures for Digital Subscriber Line Transceivers", 1 February 2001, ITU, XP002196569 *
"TS 101 524 V1.1.2 Access transmission system on metalic access cables; Symmetrical single pair high bitrate Digital Subscriber Line (SDSL)", 1 August 2001, ETSI, XP002196570 *
SORBARA,MASSIMO: "Recommendation for a 1-bit Z channel for DRR", ETSI: SDSL,TM-06022, TD54R1, 013T54R1, 14 September 2001 (2001-09-14), XP002196709 *
TANNHAEUSER, ARMIN: "Dynamic Rate Repartitioning", ETSI: SDSL TM-06022, TD15,012T15, 18 May 2001 (2001-05-18), XP002196708 *

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