CA2350558A1 - Method for transmitting information signals in the subscriber - Google Patents

Method for transmitting information signals in the subscriber

Info

Publication number
CA2350558A1
CA2350558A1 CA 2350558 CA2350558A CA2350558A1 CA 2350558 A1 CA2350558 A1 CA 2350558A1 CA 2350558 CA2350558 CA 2350558 CA 2350558 A CA2350558 A CA 2350558A CA 2350558 A1 CA2350558 A1 CA 2350558A1
Authority
CA
Grant status
Application
Patent type
Prior art keywords
transmission
method
speed
information signals
frame structure
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.)
Abandoned
Application number
CA 2350558
Other languages
French (fr)
Inventor
Torsten Vogeler
Holger Gothe
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.)
Siemens AG
Original Assignee
Siemens Aktiengesellschaft
Torsten Vogeler
Holger Gothe
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

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025Transmission of mode-switching indication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/02Details
    • H04J3/06Synchronising arrangements
    • H04J3/0635Clock or time synchronisation in a network
    • H04J3/0638Clock or time synchronisation among nodes; Internode synchronisation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/02Details
    • H04J3/12Arrangements providing for calling or supervisory signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/16Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1605Fixed allocated frame structures
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/04Selecting arrangements for multiplex systems for time-division multiplexing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/16Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1694Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q2213/00Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13039Asymmetrical two-way transmission, e.g. ADSL, HDSL
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q2213/00Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13216Code signals, frame structure
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q2213/00Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13292Time division multiplexing, TDM
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q2213/00Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13298Local loop systems, access network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q2213/00Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1336Synchronisation

Abstract

Transmission speeds are becoming increasingly faster, requiring transmission techniques that enable optimal utilization of the relevant transmission medium. Cables are used as a transmission medium in loops. Transmission rates need to be adapted to the bandwidth of the cable, even during operation.
Transmission methods used in prior art can only meet such requirements to a limited extent. The invention provides a remedy to this problem by transmitting information signals (D) and control signals (SCM) in a frame structure with variably adjustable speeds and the control signals (M) can be used to adapt the transmission speed to the cable and to meet the requirements of subscribers.

Description

n5/02/fti p9~19 FAX BELL BOYD & LOYh LLC

Description Method for transmitting information signdl~ in the subsc~iLer line domain.
The invention relates tV a method in acc.ort3anCe with the prechard~terizing clause of patent claim 1.
A3 transmission speeds ountinually increase, It is »seiul to use tran3miESion techniques which permit optimum utilizafiinn Of the transmission medium. Tn the subscriber liue domain, the transmission mediul'n used io cablca. Opt~mmm u'CiliZaLiVii is achieved when the transmission rate has been mafi.c:hed to the Rdmclwidth. of the cable. This circumstac~~:e has alroady been taken into account in the bit-oriented UEH l.tansmission techniqt~P_ With this tZan3mis3ion technique, however, it is not por~oible to transmit additional iuFormation, sur_.h as COntr01 icitvimation fox the user data, for example.
In additi~m, the IISDL transmission method is known as a stxuctttrPd baseband tectmi~ue in the prior art. However, t~tie transmi33ion rate cannot. be matched to the cable with this method, wlii~l~ means that the necessary clrcuiL r:vmplenity and costs are high for all GJ subscribers (even wi f:h a short cable or low demandE on the transrni5siom rate).
The in«Pnt:l. on is based um the obj cct of demonstrW rug a way of being ahle Lo tran5u~i L
information sir~nals In vtm subscriber line domain dynamically at different srppds between l.wo transmission devices.
The object ie achieved, nn the ba5i~ of the precharart:Prizirig clause ~f patent claim 1, by t-.he c:liaracteri~ing features of said Claim.
~i~J~p3/01~1 p5/p2/01 p9~2p FAY BELL BOYh & Loth LLr -. Ifl ppd/pip Oiie advantage of the iriVenLiu~i is, in particular, the provi5iun of a frame str»ri-.ure for various transmicEion ratP~, Within which frame structu.rp the 3.ndividual information is transmitted. Iri ~l~is context, the framel pss UI_;ri teehnolugy used iri the grior art has been extended by frames. In this frame structure, besides the actual user ciatu, information fnr hyte-oriertt_ea transmiosion, a man2gpment channel for the interchangQ of control lnfot~tudLion and a CP,C
1(7 channel for d5'essing the quality of the transmission operation are also transmitted i1i addition. These individual i L~111s Of information can be transmitted az various n x H4 kbit/s transmis5iu~~ fates u3ing one and Lhe scttue stZUCture.
Z5 Tn Addition, this frame structure oan be used Lu transmit an B kHz information item concurrently at any dpsirpd transmission rate. This information item is used, by way of example, in t.hp ISDN for selec~iy individml 64 kbit/s chantiel~ ~H cha,nnela) . In the 20 malxagament channel, control intorrnation can lj~
i nterchariged. This itilu.emation can be used, by way ~f Example, fox changing over the transmission rate dutiiig operation.
Advantageous developmpn~:s of the ittveiil.ioti are specified in the subclaims.
The invention is c~xplairied iri more d~Lail below with the aid of ati exemplary embodiment.
In the drawi nr~
Fi~uie 1 show3 the typical stx'itr-.ttlre Of a 30 ~ubscr~.ber line npi:work, Figure 2 showy the frame strur.t~~rP according t0 the invention.
Figure 1 showE, as a tyr~.ral appliCatiori, a molt; gl pxer MUX. which iS (:UlltlCC.ted t0 c7 plurality of 35 ~ul:racriber terminalE T1...Tn via nnnnPCtloris Vi...Vn. The 1 at~ter are in zhe fUL'ill Vf permanent connections in thi s cacc. This mAans that Z

45/n2/f~i ng ~ 2p F~ -- BELL BOYD & LpyD LLr_. - I~ 4~5/01~
GIt 98 P 47J Cl the actual data trarismi~sion is maintained conStanLly.
The connection ie set ur or clearmi down only duri ng inotallation or when tJte speed is changer.! over.
The permanent ~~nneCtionS are now used fi.n transmi t. the user data wing an fl7SL transtc~ission tectlttique, in each r2se at ariy desired transmission ratp_ In this context, the sending and receiving LLdn5mia3ion devirPS have the Same level of ani-.horization .1=or setting up or clearing down a connection. This means that there is no prioritization as in the ease of the known HUSL tZ'ditsmi3sion tcohnique, for Pxample. Trte influenco of erronPOUs settings is thus Significantly rRrluced.
FirJtlrp Z Shows ttie structure of the clat~a LrailSmission method EDSL. Tti this context, user information U, frame ittforxnation S for distingtllshinq indivivlual 64 )cbit/s channel s, management .itiLormation M
and mnni Coring lnfort«.Lion C far ass~ssing the quality of Lhe tran3miaeion medium are tran9mit~~d. To this end, spPrtrames era provided in the data transmission tuethod EDSL. A superframP holds $ sir~ylr frame3. Each _ surprframe is allOC:ated 384 uacr data hi t.s and the additional bits. An externally supYlied fl kH' clock signal synchroni~ca the supcrframe. The s»perframe i5 2~ designed such that, at various trausmi5aion rates, it is given the c:urrect pooition with .r.PSpect Lo the 8 kHa cloclc signal, which can be output with the correct phase aqaitt at the reception end_ The surertrame 1S triygcred at the tratzsmissi c~ri 3U end as a zGSUlt of the 8 kHz er.3gps' being counLea. The length of 't_he Counter .cwquired for this purPcsP iS
Orietil.e~:l toward the lowest speed. Thus, by way of examrlP, a Superframe contains a total a.f 4E3 bytes (6 x 0 bytcc) at a transmissiOT1 Speed oL n x 64 Jcbit/s 35 (n = 'I , ~, 4, g, J,6) , since the most 8 kHz edges per superframc appear at i:his speed. Rl. the next highsst .spaPd, Lhe l.Ligger puloc is prodttc~.pd only with each second frame etc., which is qenetally adequate.

45/02/01 49x24 FAX BELL BOYI1 & LOYD LLC- - Ifl 448/414 At the receiver end, Lhe suporframe information itr~m i_s used .iii inverted form for outputting the 8 kHz cluok signal. To ~:hi3 erid, the counter PrnduCine~ the ~t kHz ClOCk ~iynal i~ in turn triggered Ly the start of the euperframe, which is lilcewise ariPquate. At a trarismlssiuii rate of 6d kt~i t/s, the Liiggering occurs after each 4lith 8 kHz period.
Tlre auperframe is termed by a frame sync wr~r~1 which rPrmits unique allocation of the single frames and, to this end, is evaluated and monitored by the synchrnni2ation devi~c at the recept-i~n end. By ~luanging the frame structure (e.g. doubling the lengths), it is also poosibl~ to implement otlm~ n multiplex of 64 khit/s, A single frame has 52 bits in this case. OL the 52 bits, a total nt 4f3 user datz~ bits arc provided and 4 tufther bits. The latter include the sync bit S, 2 management bits M and a CRC hi l: C. The latter is ~ispd for error ~uu~eitoring. Eight sync hi is form the frame oync woxd which is received and evaluated at ~:he reception end. If the rec~ei~rar receives d frame sync word in full, the frame structure can be restorr~d_ The text below c~emoristrates how the transmission speed is cliaugGd during the transmission operation.
Hy way of example, it may be assumed that iuLvx:mation Signals are transmitted Letween the mu 1 t i pleXer MUX duct crne of the terminal s Tl . . . '1'" ( a . q .
Tq) at a particular speed. Iri this cane, transmission takes place ita Loth dircctions_ S~.~hSequeritly, the information signals noW need t~ Lc transmitted at a higher speed. Tlic change in speed will. be conLLUlled from the multirJpx2r MUX; 1t w~ulrl also be possible tn control iL .Crom the terminal T~_ The multiplexes MUX now informs the terminal T4, vid the management channel M, that l,lic tran3miseion speed i s to be incweased. At the same time ~s this, 05/02/01 09~2n FAX - BELL BOYD & LOYD LLC IQ 007/010 GFv 98 P 4'710 a timer chip :is initlateci, and when it haS tun gut, the speed is increa:.od in the multiYlexer. The terminal receives the infolmatiun item relating Lo the opeed increase via the management chanml M. The terminal Ta ~ubsequeni-.ly retuiw' an acknowledgement signal to the multiplexer MUX. At the same time as thin, the tr~rmi.nal T9 inc.rpaseS the speed.
When one of tr,P tran5uti.ssion devices i ncreases the speed, Whettmr it be the mul t.iplex device ox the Lerminal, the synchronism im the remote station , 1s lost_ To this extent, the rem~r.e station necdE to search for new synchronism. Ti11.5 13 done by virtue of the sync wvi~l being received. It the new synchror~ism 1'ms been found, t.hP iriformatlon signalE can hp serif at 1.5 an increased speed.
In the ease of ~zroneou;, transmission (e.q. U11 acCOUrit oL lack of bandwidth iri Ll.i~ cable), the receiver is not able to correct distortions in the received signal to an adpguaLe extent, and the synn word is not TeCOqni~~d. The synchronism between the [lacuna) is thus lost-. After a prescribed time, the original speed is adopted again.

Claims (4)

1. is method for selectively changing the transmission speed between two transmission devices, having a subscriber line network which links a first transmission devices (MUX) to a plurality of further transmission devices (T l...T n) and via which information signals and control signals are routed, characterized in that information signals and control signals are inserted into a frame structure, in that the frame structure has a management channel (M) in which information relating to the increase in the transmission speed is communicated to the remote station, in that the sending transmission device transmits the information signals at an increased transmission speed, as a result of which the synchronism with the remote station is lost, in that, upon receiving the information transmitted in the management channel (M), the remote station itself increases the speed until the synchronism with the sending transmission device is restored.
2. The method as claimed in claim 1, characterized in that the frame structure is formed from at least one superframe having a plurality of single frames.
3. The method as claimed in claim 1, characterized in that the first transmission device is in the form of a multiplex device (MUX).
4. The method as claimed in claim 1, characterized in that the further transmission devices are in the form of subscriber terminate (T l...T n).
CA 2350558 1998-11-04 1999-11-02 Method for transmitting information signals in the subscriber Abandoned CA2350558A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19850870.0 1998-11-04
DE19850870 1998-11-04
PCT/DE1999/003499 WO2000027162A3 (en) 1998-11-04 1999-11-02 Method for transmitting information signals in loops

Publications (1)

Publication Number Publication Date
CA2350558A1 true true CA2350558A1 (en) 2000-05-11

Family

ID=7886694

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2350558 Abandoned CA2350558A1 (en) 1998-11-04 1999-11-02 Method for transmitting information signals in the subscriber

Country Status (3)

Country Link
EP (1) EP1125388A2 (en)
CA (1) CA2350558A1 (en)
WO (1) WO2000027162A3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10035389B4 (en) * 2000-07-20 2005-11-10 Siemens Ag Method for data transmission in the access area
JP4423292B2 (en) * 2004-07-12 2010-03-03 富士通株式会社 Radio bearer control method and radio base station

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5537410A (en) * 1994-09-15 1996-07-16 Oki Telecom Subsequent frame variable data rate indication method
US5974106A (en) * 1995-09-01 1999-10-26 Motorola, Inc. Method and apparatus for multirate data communications
EP0960549B1 (en) * 1997-02-17 2003-10-22 Siemens Aktiengesellschaft Method and circuitry for transmitting digital data using an enhanced isdn technique

Also Published As

Publication number Publication date Type
WO2000027162A3 (en) 2000-08-31 application
WO2000027162A2 (en) 2000-05-11 application
EP1125388A2 (en) 2001-08-22 application

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