CN1057414C - 时分多路存取系统的编制系统 - Google Patents

时分多路存取系统的编制系统 Download PDF

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CN1057414C
CN1057414C CN91111508.0A CN91111508A CN1057414C CN 1057414 C CN1057414 C CN 1057414C CN 91111508 A CN91111508 A CN 91111508A CN 1057414 C CN1057414 C CN 1057414C
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CN1063005A (zh
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戴维·莱斯利·赫德利
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M (DGP1) Ltd
Ericsson GmbH
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/02Details
    • H04J3/06Synchronising arrangements
    • H04J3/0635Clock or time synchronisation in a network
    • H04J3/0682Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Measurement Of Optical Distance (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)

Abstract

在多站按需分配时分多路存取系统中,数字信息从主站传送到多个分站,同此所有分路收到同样的数字信息流并从中选取它们的通信信息,当对分站有命令时,通信信息可以送到分站和从分站发出。
当分站对主站随意排布时,必须知道信息脉冲的传送时间,这样信息可以依次到达主站。通信信息从属空闲时间是链路时间帧的一部分,能使分站的编制可以实行。

Description

时分多路存取系统的编制系统
本发明涉及数字通信系统,特别是涉及具有多个站的按需分配时分多路存取系统,此系统中的多个分站通过常用的传输媒体与主站通讯。以下叙述对按需分配时分多路存取称之为DA-YDMA系统。在这个系统中,从主站到分站(outstation)的数字信息传递是以所有的分站都收到相同的数字信息流并在主站的命令下,从中选取它们的通信信息这样一种方式进行的。只有下命令给分站,通讯信息才传送到分站和接收分站的通讯信息,即在DA-TDMA系统中,当一个呼叫送到分站或从分站发来时,它就成为公用电话交换网的一部分。这样的系统的一个特点是分站到主站的距离可以是随意的和未事先安排的。从主站到分站的数字信息传递称为下行传送,对下行传送来说主站与分站之间的距离的随意安排不成为问题。另一个从分站到主站的数字信息传送方向称之为上行传送,这种传送存在一个问题。这是因为对上行传送必须进行编制,使得在某一时间传送的信息不会重迭而彼此干扰。一个众所周知的方法是从进行通信的每一个分站在通信时传送载有通信信息的信息脉冲,这些脉冲依次到达主站,传送在时间上不发生重迭。
为了达到这一点,在系统中必须知道从每一分站到主站的数字信息脉冲的传送时间。获取这样的信息的方法并使用它来防止重迭称之为“编制”(ranging)。编制方法所要求的重复率和精确性取块于系统的特性,即它是静止的,移动的,无线电的,电缆电视的,光学的等等。
这样的TDMA系统的一个实例是有固定或准固定分站的多点的无线电的,光学和同轴电缆传输媒体的系统。在这样一个网络中,编制的变化率是很低的,并且当一个分站首先要求通讯时,用一种通常的技术把它“编制进来”(range-in),随后在主站监视接收的信息脉冲的相对时间,如果有必要,在分站通信的随后时间里发送消息给分站对分站送的信息脉冲在一定程度上进行校正。
本发明涉及到把一个在“系统”上的分站进行初始编制进来的过程。
处理这个问题有两个已知的方法。在第一方法中,特别是为要编制这一目的,在上行链路中要保持有空置的“无信号时间”或“保护时间”。在这个保护时间内,当主站命令一个分站如何动作后,一个分站发送一个脉冲或短脉冲串。这个脉冲或短脉冲串到达主站的时间被主站计量,并且将一个信息送到分站,要分站在一个特定时间传送它的上行链路通信信息脉冲数据,以避免和其它分站的通信信息重迭。在第二个方法中,在上行链路中从分站发出的编制的信息以低电平传送,同时所需要的上行链路数据用有高度自相关性的长数字系列进行传送。编制的信息信号的电平足够低,使之不能干扰正常的上行链路数据接收。在主站,接收器的决定编制的分离器件通过相关器确定该低电平数字系列的最可能的到达时间。
这两种已知系统都有缺点,特别在有多点的光学的,无线电的和同轴电缆的TDMA系统中是如此。第一种方法是因为有相当多的无效传送时间并且也涉及到数字存储和上行链路通信信息的延迟。第二种方法很复杂,并牵涉很多的数字处理,它一般也需要编制的信号的多路传送。
本发明是从GB No.9026932.5的申请中划分出来的。较早的一个申请No.参照No.GPT/3526)依据上面的申请提出了优先权申请。
依据本发明,提供了一个对于多站的按需分配时分多路存取(DA-TDMA)系统的编制系统。在DA-TDMA系统中,通过常用的传输媒体使多个分站与主站通讯,并且需要设定DA-TDMA系统的时隙,能够在上行链路时间帧内有一个通信信息从属的空闲时间。空闲时间包含在上行链路时间帧内,使分站的编制可以实行。
本发明现用举例的方法并结合附图描述。其中:
图1是表示一个主站以及和它相连的分站的框图;
图2是时序图。
现参照图1,图中:
HE:……主站,
OS1……,OSN:从1到N的分站;
d1,……dn:主站至OS1……OSN的距离;
它表示主站HE和数个分站OS1、OS2、OS3相连。如图所示系统可增加其它的分站。
图2是对序图,图中:
B1……BN:从分站OS1,……,OSN送出的脉冲;
td1,……,tdn:从分站OS1,……,OSN送出的脉冲B1,……,BN的编程的延迟时间;
tf1,……,tfn:对于距离是d1,……,dn的分站OS1,……,OSN脉冲信号B1,……,BN的传送时间;
当时间td1,td2,……tdn是已知时,它表示从分站发出到主站的主要通信信号B1,B2,B3……可以编程使它们依次到达主站。
在DA-TDMA系统中,时隙需要设定,当需要通信时才出现。在这种情况下,在上行链路(和下行链路)时间帧内要有一定的通信信息从属未占用时间。它使上行链路时间帧可以编制,使上行链路时间帧内总有一个从属的并成为它不可分割的一部分的足够长的“空闲”时间。空闲时间可以用于分站的编制。为了达到这一点,空闲时间必须足够长,能掩盖到达最远的分站的范围带来的不确定性;到最远的分站的最大范围是系统的必要特性。有两种方法保证空闲时间足够长。第一并且是最简单的,是等到通讯量降低,然后主站发出一个重复呼叫要分站编制进来。从开始到生效这样的过程最多要几十毫秒。这样的进程主站的网络管理控制一般都能匹配,当知道某一特定的分站要进行通讯,一旦分站编制进来开始工作,管理控制能自动生效。
第二种方法,当在繁忙的通信时间可以使用“等待——忙”,即系统中的主站在连续的工作时间下停止呼叫一直等到有足够的空闲时间。一旦分站编制进来,系统又回到正常通信可使用状态。这两种方法都要主站启动编制程序。

Claims (2)

1、一个用于多站按需分配时分多路存取系统(DA-TDMA)的编制系统,其中,多个分站通过常用的传输媒体与主站通信,且该DA-TDMA系统的时隙是按需分配的,其特征在于,在上行链路时间帧内有一个基于通信量的空闲时间,该空闲时间是集中在一起的并可用于将分站编制进来。
2、如权利要求1的编制系统,其特征在于,时间被保存起来用于上行链路上的编制操作而呼叫被停止直到有足够的时间用于编制;一旦编制进行,系统恢复正常操作。
CN91111508.0A 1990-12-12 1991-12-12 时分多路存取系统的编制系统 Expired - Lifetime CN1057414C (zh)

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GB9026932.5 1990-12-12
GB909026932A GB9026932D0 (en) 1990-12-12 1990-12-12 Tdma ranging

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JP (1) JPH06503692A (zh)
CN (1) CN1057414C (zh)
AT (1) ATE158124T1 (zh)
AU (1) AU641070B2 (zh)
CA (1) CA2090108A1 (zh)
DE (1) DE69127631T2 (zh)
DK (1) DK0561880T3 (zh)
ES (1) ES2106166T3 (zh)
FI (1) FI931783A (zh)
GB (3) GB9026932D0 (zh)
NZ (1) NZ240858A (zh)
PT (1) PT99787A (zh)
WO (1) WO1992010884A1 (zh)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN100454910C (zh) * 2003-02-28 2009-01-21 西门子公司 数据网络中的通信

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ES2078179B1 (es) * 1993-12-31 1997-10-16 Alcaltel Standard Electrica S Metodo y dispositivo de sincronizacion automatica de rafagas de datos.
US5625651A (en) * 1994-06-02 1997-04-29 Amati Communications, Inc. Discrete multi-tone data transmission system using an overhead bus for synchronizing multiple remote units
CA2440667A1 (en) * 1994-06-02 1995-12-14 Krista S. Jacobsen Method and apparatus for coordinating multi-point to point communications in a multi-tone data transmission system
GB2290680B (en) * 1994-06-22 1998-11-18 Northern Telecom Ltd Telecommunications system
US5680394A (en) * 1995-07-11 1997-10-21 Amati Communications Corporation Time division duplexed high speed data transmission system and method
US6937623B2 (en) 1997-10-22 2005-08-30 Texas Instruments Incorporated Method and apparatus for coordinating multi-point to point communications in a multi-tone data transmission system
DE69937401T2 (de) * 1999-05-21 2008-07-24 Fujitsu Ltd., Kawasaki Verfahren und vorrichtung zur nachrichtenübertragung über eine digitale teilnehmeranschlussleitung
US7212540B2 (en) 2001-04-05 2007-05-01 Nortel Networks Limited Time slot scheduling for shared-medium communications networks
CA2449065A1 (en) * 2002-11-14 2004-05-14 Hughes Electronics Corporation Systems and methods for transmitting internet protocol data via satellite

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JPS59169229A (ja) * 1983-03-16 1984-09-25 Fujitsu Ltd 二重化切換制御方式
FR2581493B1 (fr) * 1985-05-03 1987-07-10 Trt Telecom Radio Electr Systeme de transmission d'informations par voie multiplex
JPH0712161B2 (ja) * 1986-11-28 1995-02-08 日本電気株式会社 多方向多重通信システム
ATE78643T1 (de) * 1987-05-06 1992-08-15 British Telecomm Regelung von optischen systemen.
CA1304841C (en) * 1987-11-30 1992-07-07 Shigeru Sugihara Frame-interval fault detection in a demand assignment tdma communication system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100454910C (zh) * 2003-02-28 2009-01-21 西门子公司 数据网络中的通信

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GB9026932D0 (en) 1991-01-30
FI931783A0 (fi) 1993-04-20
GB9126332D0 (en) 1992-02-12
DE69127631T2 (de) 1998-01-22
JPH06503692A (ja) 1994-04-21
ES2106166T3 (es) 1997-11-01
NZ240858A (en) 1993-11-25
DK0561880T3 (da) 1998-03-23
GB2252882B (en) 1995-04-12
EP0561880B1 (en) 1997-09-10
CN1063005A (zh) 1992-07-22
ATE158124T1 (de) 1997-09-15
AU9053491A (en) 1992-07-08
AU641070B2 (en) 1993-09-09
GB9126350D0 (en) 1992-02-12
CA2090108A1 (en) 1992-06-13
GB2252701B (en) 1995-04-26
FI931783A (fi) 1993-04-20
GB2252882A (en) 1992-08-19
WO1992010884A1 (en) 1992-06-25
GB2252701A (en) 1992-08-12
DE69127631D1 (de) 1997-10-16
PT99787A (pt) 1993-11-30
EP0561880A1 (en) 1993-09-29

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