WO1992010884A1 - Tdma ranging - Google Patents
Tdma ranging Download PDFInfo
- Publication number
- WO1992010884A1 WO1992010884A1 PCT/GB1991/002198 GB9102198W WO9210884A1 WO 1992010884 A1 WO1992010884 A1 WO 1992010884A1 GB 9102198 W GB9102198 W GB 9102198W WO 9210884 A1 WO9210884 A1 WO 9210884A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ranging
- time
- outstations
- head end
- traffic
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
Definitions
- the present invention concerns digital communication systems and is particularly concerned with multistation Demand Assigned Time Division Multiple Access Systems in which a population of outstations communicate with a head end via a common transmission medium.
- Demand Assigned Time Division Multiple Access will be referred to as DA-TDMA Systems.
- digital information is communicated from the head end to the outstations in such a manner that all the outstations receive the same stream of digital information and select their traffic from it under the command of the head end. Traffic is only sent to and from an outstation when and to the extent that, there is a demand for it, e.g. in a DA-TDMA system forming part of the Public Switched Telephone Network when a call is to be sent to or from an outstation.
- ranging In order to achieve this there must be knowledge within the system of the times of flight of bursts of digital information from each outstation to the head end.
- the process of gaining this information and putting it to use so as to avoid overlap is known as "ranging".
- the repetition rate and accuracy required of the ranging process depends on the nature of the system, that is whether it is static, mobile, radio, cable T.V., optical etc.
- TDMA systems are multipoint radio, optical and co-axial cable systems with fixed or quasi-fixed outstations.
- rate of change of range is very low and a common technique is to "range-in" an outstation when it first wishes to communicate and subsequently to observe the rel tive time of reception of information bursts at the head end and, if necessary, marginally correct it by sending messages to the outstation during the subsequent period of communication by the outstation.
- the present invention is concerned with carrying out the initial ranging-in of an outstation on "installation".
- a "dead time” or “guard time” is kept clear in the uplink specifically for the purpose of ranging and an outstation transmits a pulse or short train, when commanded to do so by the head end, within this guard time.
- the time of arrival of this pulse or short pulse train at the head end is then measured by the head end and information sent to the outstation to transmit its uplink traffic bursts data at a specific time so as to avoid overlap with the traffic from other outstations.
- ranging information is transmitted from outstations on the uplink at a low level at the same time as the wanted uplink data using a long digital sequence with a high autocorrelation function.
- This ranging information signal is kept low enough in level so as not to interfere with the normal uplink data reception.
- a separate part of the receiver is employed which determines the range using a correlator to identify the most likely time of arrival of this low level digital sequence.
- the first method results in a quantity of unavailable transmission time and can also involve digital storage and delay of the uplink traffic.
- the second option is complex and involves considerable digital processing. It also normally requires multiple transmissions of the ranging signal.
- a ranging system for a multistation Demand Assigned Time Division Multiple Access (DA-TDMA) System in which a population of outstations communicate with a head end via a common transmission medium, the ti eslots of the DA-TDMA System being demand assigned so that there is a traffic dependent amount of free time in the uplink time frames and wherein the free time is consolidated and made available for ranging-in outstations.
- DA-TDMA Demand Assigned Time Division Multiple Access
- Figure 1 is a block diagram showing a head end and some associated outstations
- Figure 2 is a timing diagram.
- FIG. 1 of the drawings shows a head end 1 connected to a plurality of outstations 0S1, 0S2, 0S3.
- the system can be increased by the addition of other outstations as is indicated.
- Figure 2 is a timing diagram showing how bursts Bl, B2, B3....of main traffic signals from outstations tp the head end may be programmed to arrive sequentially at the head end once the times tdl, td2....tdn are known.
- the timeslots are demand assigned and thus are only present when required for traffic purposes.
- the free time must be sufficiently long to cover the uncertainty in range to reach the furthest outstation; a maximum range to the furthest outstation is a necessary characteristic of the system.
- the second way during periods of high traffic is to use "camp-on busy" i.e. for the head end to progressively reserve time on the system as calls are terminated until enough free time is available. Once the outstation is ranged-in, the system is released for normal traffic to use again. Both these ways require that the head end initiates the ranging procedure.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Time-Division Multiplex Systems (AREA)
- Radar Systems Or Details Thereof (AREA)
- Measurement Of Optical Distance (AREA)
- Mobile Radio Communication Systems (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Radio Relay Systems (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP92900453A EP0561880B1 (en) | 1990-12-12 | 1991-12-11 | Tdma ranging |
DE69127631T DE69127631T2 (en) | 1990-12-12 | 1991-12-11 | DISTANCE MEASUREMENT IN A T.D.M.A. SYSTEM |
JP4501717A JPH06503692A (en) | 1990-12-12 | 1991-12-11 | TDMA distance setting |
FI931783A FI931783A (en) | 1990-12-12 | 1993-04-20 | TDMA RANGORDNING |
US08/294,139 US5559805A (en) | 1990-12-12 | 1994-08-22 | Outstation ranging in demand assignment, time division multiple access, communication system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB909026932A GB9026932D0 (en) | 1990-12-12 | 1990-12-12 | Tdma ranging |
GB9026932.5 | 1990-12-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992010884A1 true WO1992010884A1 (en) | 1992-06-25 |
Family
ID=10686862
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1991/002198 WO1992010884A1 (en) | 1990-12-12 | 1991-12-11 | Tdma ranging |
Country Status (14)
Country | Link |
---|---|
EP (1) | EP0561880B1 (en) |
JP (1) | JPH06503692A (en) |
CN (1) | CN1057414C (en) |
AT (1) | ATE158124T1 (en) |
AU (1) | AU641070B2 (en) |
CA (1) | CA2090108A1 (en) |
DE (1) | DE69127631T2 (en) |
DK (1) | DK0561880T3 (en) |
ES (1) | ES2106166T3 (en) |
FI (1) | FI931783A (en) |
GB (3) | GB9026932D0 (en) |
NZ (1) | NZ240858A (en) |
PT (1) | PT99787A (en) |
WO (1) | WO1992010884A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0661836A1 (en) * | 1993-12-31 | 1995-07-05 | Alcatel Standard Electrica, S.A. | Method and device for automatic synchronisation of data bursts |
WO1995034149A1 (en) * | 1994-06-02 | 1995-12-14 | Amati Communications Corporation | Method and apparatus for coordinating multi-point-to-point communications in a multi-tone data transmission system |
GB2290680A (en) * | 1994-06-22 | 1996-01-03 | Northern Telecom Ltd | Marshalling outstations in a TDMA telecommunications system |
US5933454A (en) * | 1994-06-02 | 1999-08-03 | Amati Communications Corporation | Multi-carrier data transmissions system using an overhead bus for synchronizing multiple remote units |
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 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5680394A (en) * | 1995-07-11 | 1997-10-21 | Amati Communications Corporation | Time division duplexed high speed data transmission system and method |
WO2000072488A1 (en) * | 1999-05-21 | 2000-11-30 | Fujitsu Limited | Digital subscriber's line transmitting method and device |
US7212540B2 (en) * | 2001-04-05 | 2007-05-01 | Nortel Networks Limited | Time slot scheduling for shared-medium communications networks |
CA2449154A1 (en) * | 2002-11-14 | 2004-05-14 | Hughes Electronics Corporation | Systems and methods for selecting a transmission rate and coding scheme for use in a satellite communications |
DE10308953A1 (en) * | 2003-02-28 | 2004-09-09 | Siemens Ag | Communication in a data network |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0318911A2 (en) * | 1987-11-30 | 1989-06-07 | Nec Corporation | Frame-interval fault detection in a demand assignment TDMA communication system |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59169229A (en) * | 1983-03-16 | 1984-09-25 | Fujitsu Ltd | Duplex switch control system |
FR2581493B1 (en) * | 1985-05-03 | 1987-07-10 | Trt Telecom Radio Electr | MULTIPLEX INFORMATION TRANSMISSION SYSTEM |
JPH0712161B2 (en) * | 1986-11-28 | 1995-02-08 | 日本電気株式会社 | Multi-directional multiplex communication system |
ATE78643T1 (en) * | 1987-05-06 | 1992-08-15 | British Telecomm | REGULATION OF OPTICAL SYSTEMS. |
-
1990
- 1990-12-12 GB GB909026932A patent/GB9026932D0/en active Pending
-
1991
- 1991-12-04 NZ NZ240858A patent/NZ240858A/en unknown
- 1991-12-11 WO PCT/GB1991/002198 patent/WO1992010884A1/en active IP Right Grant
- 1991-12-11 CA CA002090108A patent/CA2090108A1/en not_active Abandoned
- 1991-12-11 DK DK92900453.9T patent/DK0561880T3/en active
- 1991-12-11 DE DE69127631T patent/DE69127631T2/en not_active Expired - Lifetime
- 1991-12-11 GB GB9126350A patent/GB2252882B/en not_active Expired - Fee Related
- 1991-12-11 ES ES92900453T patent/ES2106166T3/en not_active Expired - Lifetime
- 1991-12-11 GB GB9126332A patent/GB2252701B/en not_active Expired - Lifetime
- 1991-12-11 JP JP4501717A patent/JPH06503692A/en active Pending
- 1991-12-11 AT AT92900453T patent/ATE158124T1/en not_active IP Right Cessation
- 1991-12-11 EP EP92900453A patent/EP0561880B1/en not_active Expired - Lifetime
- 1991-12-11 AU AU90534/91A patent/AU641070B2/en not_active Ceased
- 1991-12-12 PT PT99787A patent/PT99787A/en not_active Application Discontinuation
- 1991-12-12 CN CN91111508.0A patent/CN1057414C/en not_active Expired - Lifetime
-
1993
- 1993-04-20 FI FI931783A patent/FI931783A/en not_active Application Discontinuation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0318911A2 (en) * | 1987-11-30 | 1989-06-07 | Nec Corporation | Frame-interval fault detection in a demand assignment TDMA communication system |
Non-Patent Citations (2)
Title |
---|
IBM TECHNICAL DISCLOSURE BULLETIN. vol. 10, no. 7, 7 December 1967, NEW YORK US pages 923 - 924; H.L.BLASBALG ET AL: 'Ranging for Multiple Access Satellite Communications System' * |
PROCEEDINGS OF THE IEEE vol. 65, no. 3, March 1977, NEW-YORK,US pages 434 - 443; P.P.NUSPL: 'Synchronization Methods for TDMA' * |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2078179A2 (en) * | 1993-12-31 | 1995-12-01 | Alcaltel Standard Electrica S | Method and device for automatic synchronisation of data bursts. |
EP0661836A1 (en) * | 1993-12-31 | 1995-07-05 | Alcatel Standard Electrica, S.A. | Method and device for automatic synchronisation of data bursts |
US5553077A (en) * | 1993-12-31 | 1996-09-03 | Alcatel N.V. | Method and device for automatic synchronisation of data bursts |
AU690933B2 (en) * | 1993-12-31 | 1998-05-07 | Alcatel N.V. | Synchronisation of data bursts |
US7068678B2 (en) | 1994-06-02 | 2006-06-27 | Texas Instruments Incorporated | Method and apparatus for coordinating multi-point to point communications in a multi-tone data transmission system |
WO1995034149A1 (en) * | 1994-06-02 | 1995-12-14 | Amati Communications Corporation | Method and apparatus for coordinating multi-point-to-point communications in a multi-tone data transmission system |
AU695092B2 (en) * | 1994-06-02 | 1998-08-06 | Amati Communications Corporation | Method and apparatus for coordinating multi-point-to-point communications in a multi-tone data transmission system |
US7079549B2 (en) | 1994-06-02 | 2006-07-18 | Texas Instruments Incorporated | Method and apparatus for coordinating multi-point to point communications in a multi-tone data transmission system |
US5933454A (en) * | 1994-06-02 | 1999-08-03 | Amati Communications Corporation | Multi-carrier data transmissions system using an overhead bus for synchronizing multiple remote units |
GB2290680A (en) * | 1994-06-22 | 1996-01-03 | Northern Telecom Ltd | Marshalling outstations in a TDMA telecommunications system |
GB2290680B (en) * | 1994-06-22 | 1998-11-18 | Northern Telecom Ltd | Telecommunications system |
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 |
US7110370B2 (en) | 1997-10-22 | 2006-09-19 | Texas Instruments Incorporated | Method and apparatus for coordinating multi-point to point communications in a multi-tone data transmission system |
Also Published As
Publication number | Publication date |
---|---|
AU641070B2 (en) | 1993-09-09 |
ES2106166T3 (en) | 1997-11-01 |
GB9126350D0 (en) | 1992-02-12 |
CA2090108A1 (en) | 1992-06-13 |
DK0561880T3 (en) | 1998-03-23 |
CN1057414C (en) | 2000-10-11 |
DE69127631D1 (en) | 1997-10-16 |
EP0561880B1 (en) | 1997-09-10 |
GB9126332D0 (en) | 1992-02-12 |
GB2252701A (en) | 1992-08-12 |
JPH06503692A (en) | 1994-04-21 |
GB2252882A (en) | 1992-08-19 |
EP0561880A1 (en) | 1993-09-29 |
AU9053491A (en) | 1992-07-08 |
NZ240858A (en) | 1993-11-25 |
CN1063005A (en) | 1992-07-22 |
FI931783A0 (en) | 1993-04-20 |
GB9026932D0 (en) | 1991-01-30 |
FI931783A (en) | 1993-04-20 |
GB2252882B (en) | 1995-04-12 |
DE69127631T2 (en) | 1998-01-22 |
GB2252701B (en) | 1995-04-26 |
PT99787A (en) | 1993-11-30 |
ATE158124T1 (en) | 1997-09-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5355368A (en) | Method for allocating time slots for transmission in a half-duplex time division multiple access point-to-multipoint bidirectional transmission network | |
US5293380A (en) | Frame synchronization system among multiple radio base stations for TDMA digital mobile communications system | |
US5619504A (en) | Telecommunication system and a main station for use in such a system | |
US4694453A (en) | System for adjusting signal transmission timing in time-division multiplexing signal transmission | |
US4513416A (en) | System for adjusting a time axis by using a control and an adjustment time slot in a satellite station of a TDMA network | |
US4071711A (en) | Telephone subscriber distribution system | |
AU641070B2 (en) | TDMA ranging | |
US3683116A (en) | Terrestrial interface unit | |
GB2195870A (en) | Communication system with dynamically variable frame length | |
EP0092237B1 (en) | Repeater station for use in a radio relay system to protect time deviations of time slots | |
CA2075524C (en) | Method of operation of remote data/control apparatus with controlled response timing | |
SE502168C2 (en) | Method and apparatus of a radio communication system | |
GB1112589A (en) | A wireless communication system utilizing a stationary satellite | |
KR970003531B1 (en) | Communication system using the distributed switching method for time division multiplexing of voice and data information | |
EP0479950B1 (en) | Synchronization and equalization in a tdma cellular system | |
US5808766A (en) | Method for measuring a signal transmission delay time, central station, terminal station and network to perform this method | |
US5559805A (en) | Outstation ranging in demand assignment, time division multiple access, communication system | |
EP0587664B1 (en) | Communications network and method | |
CA2192100C (en) | Detection of a low level marshalling sequence | |
AU3806195A (en) | Ranging process for point-to-multipoint communication systems | |
GB2111351A (en) | Communication systems | |
JPS56128049A (en) | Data communication system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AU CA FI JP US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB GR IT LU MC NL SE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1992900453 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2090108 Country of ref document: CA |
|
WWE | Wipo information: entry into national phase |
Ref document number: 931783 Country of ref document: FI |
|
WWP | Wipo information: published in national office |
Ref document number: 1992900453 Country of ref document: EP |
|
WWG | Wipo information: grant in national office |
Ref document number: 1992900453 Country of ref document: EP |