WO1999025083A1 - A method and arrangement for wireless data transmission - Google Patents
A method and arrangement for wireless data transmission Download PDFInfo
- Publication number
- WO1999025083A1 WO1999025083A1 PCT/SE1998/000842 SE9800842W WO9925083A1 WO 1999025083 A1 WO1999025083 A1 WO 1999025083A1 SE 9800842 W SE9800842 W SE 9800842W WO 9925083 A1 WO9925083 A1 WO 9925083A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- adaptation circuit
- dab
- information
- memory
- computer
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/86—Arrangements characterised by the broadcast information itself
-
- 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
- H04H20/71—Wireless systems
- H04H20/72—Wireless systems of terrestrial networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H2201/00—Aspects of broadcast communication
- H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
- H04H2201/20—Aspects of broadcast communication characterised by the type of broadcast system digital audio broadcasting [DAB]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
Definitions
- the present invention relates to a method and to an arrangement for wireless, data transmission. More specifically, the invention relates to the transmission of data by digital broadcasting transmissions.
- the present invention relates primarily to a method and to an arrangement for transmitting data from one computer to one or more other computers with the aid of a radio transmitter and one or more receivers, so as to enable data to be transmitted in applications using equipment produced in accordance with the international standard DAB (Digital Audio Broadcast).
- DAB Digital Audio Broadcast
- Frequencies are at present allotted to land-based DAB transmissions over the whole of Europe.
- the frequency spaces primarily used are TV channels in VHF band 111.
- Each DAB channel can transmit 2.304 Mbit/s gross, which corresponds, for instance, from five to six high-quality stereo programmes .
- COFDM Coded Orthogonal
- Frequency Division Multiplex which enables all transmitters in a region-covering network to send the same signals on the same frequency without creating interference problems due to co-channel interference.
- the entire bit stream in the DAB signal is transmitted in frames that have a typical duration of 96 ms.
- Each frame combines data from three channels, namely from the main service channel MSC, from the fast information channel FIC and from the synchronization channel.
- the main service channel MSC may contain both service information, ISO/MPEG-coded audio signals and general data transmission in packet mode or stream mode.
- a so-called multiplex controller determines how the various information components shall be combined.
- This control information is sent separately in the fast information channel FIC.
- the mutual division between the information components can be controlled dynamically in accordance with requirements.
- the information channel FIC also discloses how data in the main service channel shall be interpreted at each moment in time.
- the entire main service channel MSC can be used, in principle, for data transmission, giving a net bit rate of 1.2 to 1.5 Mbit/s.
- the DAB standard is primarily intended to enable six to seven high-quality stereo radio programmes to be transmitted in each DAB channel of about 2 Mhz, although the distribution of the content of a DAB channel, called an ensemble, can be allocated dynamically and used for purposes other than the transmission of digitalized and compressed sound channels.
- the standard also provides space for the transmission of data in greater or smaller parts of a DAB channel, either with a limited transmission requirement in the form of packet switched data quantities in a simpler case, or for the highest data rate of up to 2 Mbit/s when the entire ensemble is disposed for data transmission in a stream mode.
- the DAB system should be capable of transmitting digital data from one computer to one or more other computers, at a rate of up to 1.5 Mbit/s.
- the present invention solves this problem and enables data to be transferred between computers with the aid of the DAB system.
- the cost of transmitting ether-carried information with the aid of the present invention can be drastically reduced while many receivers can be reached simultaneously.
- a receiver need not be stationary but can be mobile.
- Information concerning a rescue service, emergency service, or a police service could be sent to mobile units, i.e. to rescue vehicles and police cars. Such transmission would facilitate the co-ordination of personnel, etc., in rescue operations and police operations of comprehensive magnitude, by virtue of all parties concerned receiving updated information simultaneously.
- the present invention thus relates to a method for the wireless transmission of data between one computer and one or more other computers with the aid of the DAB system or a corresponding system for the digital, wireless transmission of data, wherein the transmitting computer is connected to a DAB transmitter, wherein the receiving computer or the receiving computers is/are connected to a respective DAB receiver, and wherein the method is characterized in that information outputted intermittently from the transmitting computer is stored intermediately in a memory in a first adaptation circuit, between the transmitting computer and the DAB transmitter, in that information is fed from said memory to the DAB transmitter essentially continuously under the control of an outfeed oscillator in the adaptation circuit, in that transmitted information is received by a DAB receiver and fed into a memory in a second adaptation circuit under the control of an input oscillator in said second adaptation circuit, in that the two oscillators operate on the same or essentially the same frequency, and in that the receiving computer is caused to take information intermittently from the memory store in the second adaptation circuit.
- the invention also relates to an arrangement that has the main features defined in Claim 5.
- Figure 1 is a block schematic illustrating a transmitter side and a receiver side.
- Shown in the Figure is an arrangement for the wireless transmission of data between a computer 1 and one or more other computers 2 with the aid of the DAB system or a corresponding system for the wireless transmission of digital data.
- a corresponding system may be a system for digital TV transmissions.
- the transmitting computer 1 is connected to a known DAB transmitter 3 that ha_s a transmitter antenna 5.
- the receiving computer or computers 2 is/are connected to a respective known DAB receiver 4 that has a receiver antenna 6.
- the inventive arrangement includes a first adaptation circuit 7 between the transmitting computer 1 and the DAB transmitter 3.
- the adaptation circuit 7 is adapted for the intermediate storage of information outputted intermittently from the transmitting computer 1 in a memory 8 belonging to said adaptation circuit.
- the memory may be a RAM memory or a FIFO memory.
- the adaptation circuit is also adapted to take information from the memory 8 and feed this information to the DAB transmitter 3 generally continuously under the control of an outfeed oscillator 9 in the adaptation circuit 7.
- the oscillator 9 controls the outfeed of information from the memory 8 to the DAB transmitter 3, via an outfeed circuit 10 of some suitable known kind.
- a second adaptation circuit 11 is provided between respective DAB receivers 4 and receiving computers 2.
- This second adaptation circuit 11 is adapted to feed information received by the DAB receiver 4 into a memory store 12 in the second adaptation circuit under the control of an infeed oscillator 13 in said second adaptation circuit.
- the oscillator 13 controls the infeed of information from the DAB receiver 4 to the memory 12, via an infeed circuit 14 of some suitable known kind.
- the memory 12 may be a RAM memory or a FIFO memory .
- the two oscillators 9, 13 are adapted to operate at mutually the same frequency, or at essentially the same frequency, in accordance with the DAB standard.
- the receiving computer 2 is adapted to fetch information intermittently from the memory 12 in the second adaptation circuit.
- the oscillator 13 in the second adaptation circuit 11 is adapted to be synchronized with the oscillator 9 in the first adaptation circuit, by locking the frequency of the second oscillator 13 to a reference included in the received signal. This can be achieved by including in the second adaptation circuit 11 a microprocessor 15 that functions to detect the signal received by the DAB receiver and to decode a predetermined part of said received signal that constitutes said reference and therewith activate the oscillator 13.
- the microprocessor 15 is adapted to determine from a FIC (Fast Information Channel) in the DAB system those parts of the received signal that contain data.
- the microprocessor is also adapted to store received data in the memory 12 of said adaptation circuit.
- the microprocessor 15 includes software that causes the received information to be structured and stored in the memory 12 in a form that enables a standard PC 2 to fetch information from the memory 12.
- the software can be installed in the personal computer, PC.
- the microprocessor 15 in the second adaptation circuit 11 is adapted to identify information that is relevant to the receiving computer 2 and that includes identification of address information and possibly also authorization.
- the possibility of detecting authorization is achieved by programming the microprocessor so that it will only feed received information into the memory 12 when the information received includes an authorization code.
- This authorization can be given, for instance, by providing a subscriber that has a DAB receiver with a smart card that is read by a card reader 16 connected to the microprocessor 15 and containing said authorization code.
- the microprocessor is, in this regard, adapted to compare an authorization code received by the DAB receiver with the authorization code entered by means of the smart card.
- This embodiment can be used, for instance, when the information transmitted includes various types of news. Only subscribers that have paid for their subscription and therewith obtained a smart card which includes a valid authorization code can receive the transmitted information.
- the information to be transmitted is stored intermediately in the memory of the first adaptation circuit.
- the information to be transmitted is sent via the DAB system in a more or less continuous form, whereas information is delivered intermittently from the transmitting computer 1 , as before mentioned.
- the information is outputted to the DAB transmitter from said memory 8 essentially continuously and under the control of the outfeed oscillator 9.
- Transmitted information is thus received by the DAB receiver in an essentially continuous form, and is fed into the memory in the second adaptation circuit 11 under the control of the infeed oscillator 13.
- the receiving computer is then caused to fetch information intermittently from the memory in the second adaptation circuit.
- the present invention thus enables information to be transmitted via the DAB system, or some corresponding system for the wireless transmission of data, at high speed and in a more or less continuous form between standard computers, such as typical personal computers, PCs, which are not constructed to output and input data essentially continuously but, instead, constructed to output and input information in bursts .
- the present invention thus solves the problem mentioned in the introduction.
- Adaptation circuits 7, 11 have been described in the aforegoing. These circuits may be physically separate units or may comprise an electronic card that can be mounted in a PC or some other computer. Naturally, the invention does not solely apply to personal computers and can be applied to all types of computers.
- the adaptation circuit may, of course, be constructed in many different ways for achieving the aforedescribed function. It will be obvious to the person skilled in this art that the structural design of the adaptation circuits can vary.
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Circuits Of Receivers In General (AREA)
- Transceivers (AREA)
- Communication Control (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002309119A CA2309119A1 (en) | 1997-11-10 | 1998-05-07 | A method and arrangement for wireless data transmission |
EP98921988A EP1032993A1 (en) | 1997-11-10 | 1998-05-07 | A method and arrangement for wireless data transmission |
JP2000519965A JP2001523063A (en) | 1997-11-10 | 1998-05-07 | Method and apparatus for transmitting wireless data |
AU74628/98A AU745196B2 (en) | 1997-11-10 | 1998-05-07 | A method and arrangement for wireless data transmission |
NO20002411A NO321683B1 (en) | 1997-11-10 | 2000-05-09 | Procedure and arrangement for wireless data transfer between computers using a DAB system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9704101-6 | 1997-11-10 | ||
SE9704101A SE512756C2 (en) | 1997-11-10 | 1997-11-10 | Method and device for wireless data transmission |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999025083A1 true WO1999025083A1 (en) | 1999-05-20 |
Family
ID=20408920
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1998/000842 WO1999025083A1 (en) | 1997-11-10 | 1998-05-07 | A method and arrangement for wireless data transmission |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1032993A1 (en) |
JP (1) | JP2001523063A (en) |
AU (1) | AU745196B2 (en) |
CA (1) | CA2309119A1 (en) |
NO (1) | NO321683B1 (en) |
SE (1) | SE512756C2 (en) |
WO (1) | WO1999025083A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101459483B (en) * | 2007-12-10 | 2012-06-06 | 联想(北京)有限公司 | Method, transmission point and system for implementing urban digital broadcast |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5132989A (en) * | 1989-10-27 | 1992-07-21 | U.S. Philips Corporation | Method of transmitting a sequence of m binary words of "p" bits and transmission arrangement implementing this method |
GB2313981A (en) * | 1996-06-06 | 1997-12-10 | Roke Manor Research | High speed wireless internet connection for portable computers |
-
1997
- 1997-11-10 SE SE9704101A patent/SE512756C2/en not_active IP Right Cessation
-
1998
- 1998-05-07 JP JP2000519965A patent/JP2001523063A/en active Pending
- 1998-05-07 WO PCT/SE1998/000842 patent/WO1999025083A1/en active IP Right Grant
- 1998-05-07 CA CA002309119A patent/CA2309119A1/en not_active Abandoned
- 1998-05-07 EP EP98921988A patent/EP1032993A1/en not_active Withdrawn
- 1998-05-07 AU AU74628/98A patent/AU745196B2/en not_active Ceased
-
2000
- 2000-05-09 NO NO20002411A patent/NO321683B1/en not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5132989A (en) * | 1989-10-27 | 1992-07-21 | U.S. Philips Corporation | Method of transmitting a sequence of m binary words of "p" bits and transmission arrangement implementing this method |
GB2313981A (en) * | 1996-06-06 | 1997-12-10 | Roke Manor Research | High speed wireless internet connection for portable computers |
Non-Patent Citations (1)
Title |
---|
SERGE FDIDA, MICHELE MORGANTI, EUROPEAN CONFERENCE ON MULTIMEDIA APPLICATIONS, SERVICES AND TECHNIQUES - ECMAST' 97, 21-23 May 1997, (Milan, Italy), pages 593-607. * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101459483B (en) * | 2007-12-10 | 2012-06-06 | 联想(北京)有限公司 | Method, transmission point and system for implementing urban digital broadcast |
Also Published As
Publication number | Publication date |
---|---|
SE512756C2 (en) | 2000-05-08 |
SE9704101L (en) | 1999-05-11 |
NO321683B1 (en) | 2006-06-19 |
NO20002411L (en) | 2000-06-30 |
NO20002411D0 (en) | 2000-05-09 |
JP2001523063A (en) | 2001-11-20 |
CA2309119A1 (en) | 1999-05-20 |
AU7462898A (en) | 1999-05-31 |
SE9704101D0 (en) | 1997-11-10 |
EP1032993A1 (en) | 2000-09-06 |
AU745196B2 (en) | 2002-03-14 |
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