WO2001052436A9 - Systeme dynamique a sauts de frequence - Google Patents

Systeme dynamique a sauts de frequence

Info

Publication number
WO2001052436A9
WO2001052436A9 PCT/US2001/000501 US0100501W WO0152436A9 WO 2001052436 A9 WO2001052436 A9 WO 2001052436A9 US 0100501 W US0100501 W US 0100501W WO 0152436 A9 WO0152436 A9 WO 0152436A9
Authority
WO
WIPO (PCT)
Prior art keywords
defined frequency
bands
control signal
frequency band
transmitter
Prior art date
Application number
PCT/US2001/000501
Other languages
English (en)
Other versions
WO2001052436A1 (fr
Inventor
W Kurt Dobson
Dirk Ostermiller
Sy Prestwich
Todor Cooklev
Original Assignee
Aware Inc
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 Aware Inc filed Critical Aware Inc
Priority to EP01906518A priority Critical patent/EP1245083A4/fr
Priority to CA002394751A priority patent/CA2394751A1/fr
Priority to AU34417/01A priority patent/AU3441701A/en
Priority to KR1020027008793A priority patent/KR20020063299A/ko
Priority to JP2001552543A priority patent/JP2003520488A/ja
Publication of WO2001052436A1 publication Critical patent/WO2001052436A1/fr
Publication of WO2001052436A9 publication Critical patent/WO2001052436A9/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7136—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/715—Interference-related aspects
    • H04B2001/7154—Interference-related aspects with means for preventing interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff

Definitions

  • This invention relates generally to wireless communication systems utilizing frequency hopping.
  • the Bluetooth standard is available at www.bluetooth.com and is incorporated here as a reference in its entirety.
  • U-NII Unlicensed National Information Infrastructure
  • Frequency hopping systems are currently the most popular and a lot of work has been done in frequency-hopping systems.
  • This patent describes an arrangement for a frequency-hopping wireless local area network (WLAN) where there is a controller base station which controls the carrier frequency hop timing of the other base stations. This is convenient for some frequency-hopping WLANs, but does not solve the fundamental problem of coexistence.
  • WLAN wireless local area network
  • a system, where at least one transceiver searches for a set of usable frequencies and communicates this set to the other transceivers on the network, and employs frequency-hopping in this set of frequencies is disclosed in US Patent 5,214,788, assigned to Thomson-CSF of Puteaux, France, and incorporated here as a reference in its entirety.
  • Each of the base stations has a coverage area divided into a plurality of N concentric regions, with each concentric region assigned one of the N sets of frequencies.
  • WLAN wireless personal area network
  • WLAN devices installed in typical home and office spaces, etc., and is based on assumptions that the different systems are less likely to be used simultaneously. This does nothing to solve the coexistence problem, and is, furthermore, wrong in home networking applications, where all systems are likely to be used at the same time.
  • Fig. 1 illustrates the operation of an exemplary frequency hopping systems.
  • the 2.4 GHz ISM band is 83.5 MHz wide, between 2.4 and 2.4835 GHz, everywhere except in Spain, France, and Japan. (Here we describe the operation in the USA and Europe, a substantially similar method of operation can be constructed for Spain, France and Japan).
  • time instant tl only a lMHz-wide band around fl is used.
  • time instant t2 another lMHz-wide band is used, centered around another frequency.
  • the hopping is performed according to a pseudo-random sequence, known only to the transmitter and the intended receiver.
  • the hopping sequence is derived from the device address of the master of the connection.
  • the master of the connection is the device that temporarily controls the communication, all devices are physically the same and are able to assume the role of masters. Since the hopping sequence is not known to other receivers, hopping is considered secure. Furthermore, if one of the narrowband 1 MHz- wide channels is jammed, for example fl, the next channel is very likely to be good.
  • the operation of the system according to the first embodiment of the present invention is as follows.
  • the master of the connection monitors the signal-to-noise ratio in all channels. Then it finds a channel that has the highest signal-to-noise ratio and communicates this to the other devices. Further communication takes place on the selected channel without frequency hopping to other channels. Should the signal-to- noise ration on this channel deteriorate gradually or suddenly to the point it can no longer be used for reliable communication, the frequency hopping within the entire band is restored by the master issuing a command to the slaves. Then, another attempt is made to find a single channel that can be reliably used for communication. In this system frequency hopping is used only during establishment of a connection, or when a change in the frequency channel needs to be implemented. At all other times frequency hopping is not performed.
  • the U- ⁇ II bands are governed in the U.S. by FCC Part 15.401 through 15.407 and the regulations are given in Table 2 and non-spread operation in these bands is also possible. Also, while here we are mainly concerned with regulations in the United States, similar regulations exist in the other countries. Thus the applicability of the present invention is not limited to the United States, and the implementation of a system according to this embodiment would be substantially similar everywhere in the world.
  • the first embodiment of the present invention has a number of advantages.
  • the other channels can be used by other wireless systems, which may or may not be frequency-hopping.
  • some of the other wireless systems can be high-rate orthogonal frequency-division multiplexing (OFDM) systems.
  • OFDM orthogonal frequency-division multiplexing
  • the proposed here solution is the simplest and most economical way to achieve coexistence among wireless communication systems. While sophisticated error-correcting coding and equalization may improve the performance of all wireless systems, even when they face the "big stick” policy, the complexity and cost would be significant and perhaps prohibitive in high-volume applications.
  • the proposed here implementation replaces the "big stick" policy with the "good citizen” policy.
  • the devices can hop in a narrower band.
  • the invention can be implemented by restricting the value of the integer K to a closed subset of the set ⁇ 0, ..., 78 ⁇ .
  • the rest of the band is made available for other wireless systems. This also achieves the objectives of the present invention, and - since frequency hopping continues to be employed albeit in a narrower band - the devices can transmit typically at a higher power than non-spread devices, according to the appropriate regulations.
  • a wireless transceiver e.g. the master of the connection will determine which subband of the entire band to use, on the basis of the vacant portion of the spectrum. For example, if there is another wireless system in operation in the same band, which is also a "good citizen", most of the channels will offer a high signal-to-noise ratio.
  • the transceiver can select those that offer the highest signal-to-noise ratio.
  • Another instance of the second embodiment is where the transceiver selects a number of channels, depending on the requirements for the particular application. Thus a higher data rate can be obtained.
  • the operation of the wireless system according to this second embodiment is dynamic, and if the conditions on the selected channels deteriorate, e.g.
  • the system returns to hopping in the entire band, and selects another set of good channels.
  • the system may select a new set of channels without returning to hopping in the entire band. This can happen, for example, if conditions have deteriorated on only some of the channels, such that other channels still offer acceptable signal-to-noise ratio.
  • the master of the connection can communicate the new set of channels to the other transceivers using only the available good channels.
  • Another part of the second embodiment is that when there is a change in the number of channels used power may be adjusted to levels allowed by the appropriate regulatory agencies, if necessary.
  • One implementation of the second embodiment can be easily devised in the important special case of Bluetooth. This standard supports different number of hop frequencies according to the country of operation.
  • Japan for example, has only 23 MHz available in this ISM band.
  • the hop frequencies for Japan are already a closed subset of the set ⁇ 0, ..., 78 ⁇ .
  • Bluetooth devices have a built-in capability to hop on four different set of channels. This can facilitate the implementation, at least for the US and the rest of the world, of the second embodiment of the present invention.
  • the devices will be managed by a wireless hub or a spectrum-managing controller.
  • this spectrum- managing controller will find a suitable channel or a set of channels and will communicate them to the devices.
  • the spectrum-managing controller will dynamically monitor and manage the frequency band of interest.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un système à sauts de fréquence, dans lequel la largeur de bande de saut de fréquence est modifiée en réponse à une modification de conditions de canal ou de commande. On peut également modifier la puissance de sortie en même temps que la bande de fonctionnement, de sorte que ledit système satisfait à tout moment aux exigences de régularité du pays dans lequel il fonctionne.
PCT/US2001/000501 2000-01-08 2001-01-08 Systeme dynamique a sauts de frequence WO2001052436A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP01906518A EP1245083A4 (fr) 2000-01-08 2001-01-08 Systeme dynamique a sauts de frequence
CA002394751A CA2394751A1 (fr) 2000-01-08 2001-01-08 Systeme dynamique a sauts de frequence
AU34417/01A AU3441701A (en) 2000-01-08 2001-01-08 Dynamic frequency-hopping system
KR1020027008793A KR20020063299A (ko) 2000-01-08 2001-01-08 동적 주파수-호핑 시스템
JP2001552543A JP2003520488A (ja) 2000-01-08 2001-01-08 動的周波数ホッピングシステム

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US17544900P 2000-01-08 2000-01-08
US60/175,449 2000-01-08

Publications (2)

Publication Number Publication Date
WO2001052436A1 WO2001052436A1 (fr) 2001-07-19
WO2001052436A9 true WO2001052436A9 (fr) 2002-07-18

Family

ID=22640252

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/000501 WO2001052436A1 (fr) 2000-01-08 2001-01-08 Systeme dynamique a sauts de frequence

Country Status (6)

Country Link
EP (1) EP1245083A4 (fr)
JP (1) JP2003520488A (fr)
KR (1) KR20020063299A (fr)
AU (1) AU3441701A (fr)
CA (1) CA2394751A1 (fr)
WO (1) WO2001052436A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7474677B2 (en) 2003-08-12 2009-01-06 Bose Corporation Wireless communicating
US8442019B2 (en) 2003-08-12 2013-05-14 Bose Corporation Method and apparatus for avoiding wireless audio signal transmission interferences
PT1880560E (pt) 2005-06-15 2010-12-07 Huawei Tech Co Ltd Processo e sistema para a atribuição de recursos de comunicações
US8243773B2 (en) * 2006-05-26 2012-08-14 Itron, Inc. Clear-channel system and related applications
US10013381B2 (en) 2006-08-31 2018-07-03 Bose Corporation Media playing from a docked handheld media device
US10089702B2 (en) 2014-01-17 2018-10-02 Airbnb, Inc. Location based ranking of real world locations

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2277231B (en) * 1984-05-12 1995-03-15 Racal Res Ltd Communications system
US5668828A (en) * 1992-05-08 1997-09-16 Sanconix, Inc. Enhanced frequency agile radio
US5287384A (en) * 1992-10-15 1994-02-15 Lxe Inc. Frequency hopping spread spectrum data communications system
US5459759A (en) * 1993-02-17 1995-10-17 Interdigital Technology Corporation Frequency hopping code division multiple access system and method
US5335249A (en) * 1993-07-29 1994-08-02 Seattle Silicon Corporation Method and apparatus for spread spectrum communications
US5459760A (en) * 1993-11-05 1995-10-17 Matsushita Electric Industrial Co., Ltd. Transmitting and receiving apparatus
US5579306A (en) * 1994-09-01 1996-11-26 Ericsson Inc. Time and frequency slot allocation system and method
US5528623A (en) * 1994-10-26 1996-06-18 American Wireless Corporation Cordless telephone system having automatic control of transmitter power and frequency in response to changing conditions
JP3284074B2 (ja) * 1996-03-25 2002-05-20 キヤノン株式会社 無線通信システム及びその制御方法、無線通信装置及びその制御方法
JPH10271037A (ja) * 1997-03-19 1998-10-09 Fujitsu General Ltd スペクトラム拡散無線通信装置
JPH10271041A (ja) * 1997-03-24 1998-10-09 Brother Ind Ltd 無線通信装置

Also Published As

Publication number Publication date
EP1245083A4 (fr) 2003-06-04
KR20020063299A (ko) 2002-08-01
AU3441701A (en) 2001-07-24
WO2001052436A1 (fr) 2001-07-19
EP1245083A1 (fr) 2002-10-02
CA2394751A1 (fr) 2001-07-19
JP2003520488A (ja) 2003-07-02

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