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WO2002005448A1 - Gestion de ressources dans un systeme a sauts de frequence non coordonnes - Google Patents

Gestion de ressources dans un systeme a sauts de frequence non coordonnes Download PDF

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Publication number
WO2002005448A1
WO2002005448A1 PCT/EP2000/009274 EP0009274W WO0205448A1 WO 2002005448 A1 WO2002005448 A1 WO 2002005448A1 EP 0009274 W EP0009274 W EP 0009274W WO 0205448 A1 WO0205448 A1 WO 0205448A1
Authority
WO
WIPO (PCT)
Prior art keywords
traffic channel
communication unit
frequency hopping
slow
hopping traffic
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.)
Ceased
Application number
PCT/EP2000/009274
Other languages
English (en)
Inventor
Jacobus Haartsen
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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
Priority claimed from US09/666,298 external-priority patent/US7180903B1/en
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to AU2000279060A priority Critical patent/AU2000279060A1/en
Publication of WO2002005448A1 publication Critical patent/WO2002005448A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • 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
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2615—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using hybrid frequency-time division multiple access [FDMA-TDMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/04—Scheduled access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup

Definitions

  • the present invention relates to radio communication systems.
  • the present invention is related to communication systems which use frequency hopping in un-licensed frequency carriers.
  • a hybrid or combined communication channel which includes a Frequency Hopping (FH) channel for medium- range, low-rate services and a static or fixed frequency channel for short-range, high-rate services.
  • FH Frequency Hopping
  • the system may be considered generally based on the
  • Bluetooth air interface which defines a FH channel using a basic rate of 1 Mb/s in the 2.4 GHz ISM band.
  • a high rate static channel may be defined by selecting a broadband channel, e.g. 4 MHZ, which may be positioned at a spectral location which may be determined to have the least amount of interference.
  • the static channel may be determined by adaptive channel allocation based on receive signal strength measurements carried out by the radio units. Once a static channel of about 4 MHZ bandwidth has been selected in the manner described, high data rate communication, for example, between multiple slave may proceed directly over the fixed channel.
  • Communication over the FH channel is configured to avoid the frequency band occupied by the static channel in order to avoid mutual interference.
  • the parent application describes how the FH sequence used on the FH channel may be adapted to avoid the frequency band occupied by the static high-rate channel. It should be noted that since a typical Bluetooth-based system uses 79 channels, and since only 75 are generally required, the FH sequence can be adapted to avoid 4 carriers of 1 MHZ each. The combined bandwidth of the avoided channels represents 4 MHZ, thus fitting the requirement for the high-rate channel.
  • the FCC rules require systems to spread signal energy when operating in the 2.4 GHz ISM band at power levels higher than 0.75mW but lower than 1W.
  • Frequency hopping systems are further required to hop over at least 75 carriers, with the hop channel bandwidth restricted to 1 MHZ.
  • signal energy spreading may also be obtained using direct-sequence spread spectrum (DSSS), provided the spreading gain is at least 10.
  • DSSS direct-sequence spread spectrum
  • a method for communication using a plurality of time slots within a frequency spectrum is described.
  • solutions to the foregoing and other problems are achieved by establishing a fast frequency hopping traffic channel between a first and a second communication unit.
  • the fast frequency hopping traffic channel may have a set of the plurality of time slots, e.g. as may be associated with a TDMA communication environment, and a first set of hop carrier frequencies within the frequency spectrum associated therewith.
  • a slow frequency hopping traffic channel may then be established between a third and fourth communication unit. It should be noted that the slow frequency hopping traffic channel may have a second set of hop carrier frequencies within the frequency spectrum associated therewith.
  • one or more data packets may be communicated on one or more of the set of the plurality of time slots from the first commumcation unit to the second communication unit over the fast frequency hopping traffic channel at a rate of between 1-3 Mb/s.
  • the bandwidth associated with a fast frequency hopping channel may preferably be 1 MHZ.
  • Data packets may further be communicated from the third communication unit to the fourth communication unit on one or more of the set of the plurality of time slots over the slow frequency hopping traffic channel at a rate exceeding 5 Mb/s.
  • the bandwidth associated with the slow frequency hopping channel may be on the order of 4MHz.
  • the slow frequency hopping traffic channel may be established by establishing an initial location of the slow frequency hopping traffic channel according to a slow hop sequence.
  • the initial location may be, for example, a first 4 MHz band located within the frequency spectrum.
  • a time interval e.g. 100ms
  • the location of the slow frequency hopping traffic channel may be adapted according to the slow hop sequence and located at a new 4 MHZ band elsewhere in the frequency spectrum.
  • one or more data packets may be communicated on one or more of the first set of the plurality of time slots from the first communication unit to the second communication unit over the fast frequency hopping traffic channel such that the initial location and the adapted location are avoided. Accordingly, the number of hop carrier frequencies associated with the fast frequency hopping traffic channel is reduced, for example, by the size of the slow frequency hopping traffic channel.
  • the fast frequency hopping traffic channel may be established between the first, the second, and the third communication unit and the slow frequency hopping traffic channel may be established between the second and the third communication unit. During communication therebetween, the fast frequency hopping traffic channel avoids the location of the slow frequency hopping traffic channel.
  • the first communication unit may be a master communication unit
  • the second communication unit may a FFH slave unit
  • the third communication unit may be a SFH slave unit. While a single FFH and SFH unit are mentioned hereinabove, it should be noted that one or more of each type of slave unit may be used without departing from the invention.
  • a beacon packet may be periodically transmitted from the master to the FFH and SFH slave units over the fast frequency hopping traffic channel.
  • the beacon packet may indicate to the FFH and SFH slave units the location of the slow frequency hopping traffic channel by including such information therein.
  • FIG 1 is a diagram illustrating exemplary fast and slow frequency hopping in accordance with various exemplary embodiments of the present invention
  • FIG 2A is a block diagram illustrating exemplary frequency hopping selection and avoidance control in accordance with various exemplary embodiments of the present invention
  • FIG 2B is a block diagram further illustrating exemplary frequency hopping selection and avoidance control in accordance with various exemplary embodiments of the present invention
  • FIG 3 is a diagram illustrating exemplary communication sequences between and among a master and slow and fast frequency hopping slaves in accordance with various exemplary embodiments of the present invention
  • FIG 4 is a diagram illustrating exemplary communication sequences between a master and frequency hopping slaves and between a master and slaves on a static communication channel in accordance with various exemplary embodiments of the present invention.
  • FIG 1 series 100 of spectrum diagrams are illustrated. Spectral usage of FFH channels 101 and SFH channels 102 at different moments in time are shown. It should be noted that in accordance with various exemplary embodiment of the present invention,. FFH channel 101 hops at a rate of 1600 hops/s and SFH channel 102 hops at a much slower rate such as, for example, 10 hops/s. Accordingly, during a first 100ms interval, as may be represented by spectral interval 110, SFH channel 102 may be "semi" stationary relative to, for example, the much faster hopping FFH channel 101.
  • 4 MHZ channel 103 occupied by SFH channel 102 located, for example, at position 111 may be avoided in a manner similar as described in the parent application while taking into account the slow hopping of SFH channel 102 as will be described in greater detail hereinafter.
  • SFH channel 102 may occupy position 121 in another part of the band.
  • An FFH system transmitting on FFH channels 101 may now adapt its avoidance window to prevent mutual interference once between FFH channels 101 and SFH channel 102.
  • the carriers used by FFH channel 101 and SFH channel 102 are shown in FIG 1 in steps corresponding to, for example, the dwell time of SFH channel 102, e.g. 100ms.
  • FFH selection block 220 may use master identity 205 and master clock 201 at 1600 ticks/s, to select a hop sequence for FFH channel 101.
  • master identity 205 and SFH clock 202 which may initialized when SFH channel 102 is established and which may tick at lOticks/s, may be used by SFH selection block 210 to select a hop sequence for SFH channel 102.
  • the output of SFH selection block 210 may be SFH hop sequence 211 and may be fed to, for example, hop avoidance block 230 which using output from FFH selection block 220, e.g. intermediate FFH hop sequence 221, creates a window in a FFH spectrum range. More particularly, if FFH hop sequence 221 includes hop carrier which is within the frequency band indicated by SFH hop sequence 211, a different FFH carrier may be selected as been described by US 09/418,562, supra. Accordingly, a modified FFH hop sequence 231 may be generated as an output. It should be noted that master clock 201 may also be fed to hop avoidance block 230 in order to randomize the replacement of "forbidden" carriers by "allowed carriers".
  • SFH hop sequence 211 changes and a different set of carriers becomes forbidden for FFH hop sequence 221.
  • master clock 201 and SFH clock 202 are preferably derived from the same reference clock.
  • SFH selection block 210 is used as is shown in Figure 2B.
  • communicating units do not use a SFH selection box. Instead, as illustrated in FIG 3, master unit 310 for each new SFH channel tells, for example,
  • SFH slave units SFH slave X 340 and SFH slave Y 350 where to hop and tells FFH units such as, for example, FFH slave A 320 and FFH slave B 330 which hops to avoid.
  • Control of slave units in the foregoing manner may be accomplished by exploiting, for example, the beacon channel specified in Bluetooth and further described in the parent application.
  • the beacon channel specified in Bluetooth As was further described in the parent application, there is a strong interaction between, for example, a FFH piconet and a stationary channel. Communicating units on the stationary channel may remain connected to the FH piconet via the beacon channel established using beacon signals sent on the FH channel by the master.
  • beacon channel . 311 may be established and a packet may be sent thereupon which contains a frequency band to be used next by, for example, SFH slave X 340 and SFH slave Y 350. Since information on beacon channel 311 is broadcast to all units in range, FFH slave A 320 and FFH slave 330, for example, may use information associated with beacon channel 311 to open a window in the FFH sequence. As is further illustrated in FIG 3, information associated with beacon channel 311 may be transmitted at a periodic interval, for example every 100ms, by master 310.
  • FFH slave A 320, FFH slave B 330, SFH slave X 340 and SFH slave Y 350 may listen to beacon channel 311 to adjust their channel parameters. Further as illustrated in FIG 3, first beacon packet 312 sent by master 310 on beacon channel 311 may direct, for example, SFH slave X 340 and
  • FFH slave A 320 and FFH slave B 330 accordingly may receive first beacon packet 312 and use the information contained therein to ayoid carriers associated with band Bl.
  • Second beacon packet 313 may be sent by master 310 on beacon channel 311 to direct SFH slave X 340 and SFH slave Y to band B2 and to inform FFH slave A 320 and FFH slave B 330 to avoid carriers in band B2, and so on.
  • the SFH sequence may be generated within master 310 and may depend upon, for example, the identity of master 310 and/or a random or pseudo-random number.
  • beacon 311 is preferably transmitted by an anchor unit as has been described in an unpublished paper entitled "Method for networking in uncoordinated FH piconets," by J.C. Haartsen, Ericsson Disclosure Reference No. BT 12778.
  • An anchor unit may be used to coordinate and control a number of independent piconets. Individual piconets may further adjust respective FFH avoidance windows based on beacon information sent by the anchor unit.
  • communication scenario 400 may include master 410, FH slave A 420, FH slave B 430, HS slave X 440, and HS slave Y 450.
  • HS slave X 440 and HS slave Y 450 communicate on a static high speed traffic channel as may further be described in the parent application.
  • a FH channel may be established between, for example, master 410 and FH slave A 420, and between master 410 and FH slave B 430 during timeslots within exemplary intervals 411, 413, and 415.
  • HS slave X 440 and HS slave Y 450 may communicate on an HS channel during exemplary intervals 401, 402, and 403.
  • the HS channel may use a single carrier frequency chose using, for example, a dynamic channel allocation scheme or the like, and may use much smaller or shorter timeslots to better accommodate communication on the HS channel between HS slave X 440 and HS slave Y 450. It should further be noted that while FH channels and the static HS channel may use separate frequencies, timeslots may be aligned.
  • HS slave X 440 and HS slave Y 450 are fully aware of timing and hop sequences associated with communications on the FH channel and are configured to operate within the FH band. Accordingly, HS slave X 440 and HS slave Y 450 may, for example, suspend communications when the FH hop sequence overlaps with the HS frequency channel as illustrated, for example, in exemplary mtervals 412 and 414. As can be seen during the duration of an overlap, for example, between tl and t2 for interval 412 and between t3 and t4 for interval 414, HS slave X 440 and HS slave Y 450 may suspend transmission on the HS channel. More specifically, it can be seen that exemplary.hop carrier F-k+3 at interval 412 and hop carrier
  • any packets scheduled for transmission for example, by HS slave X 440 or HS slave Y 450 must be completed before tl or t3. Otherwise, transmission must be postponed until after t2 or t4.

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

Abstract

La présente invention concerne un procédé et un appareil permettant d'établir une communication, par utilisation de plusieurs intervalles de temps dans un spectre de fréquences. Un canal de trafic à sauts de fréquence rapides, qui présente un ensemble desdits plusieurs intervalles de temps et un premier ensemble de fréquences porteuses de sauts, est établi entre une première et une deuxième unité de communication. Un canal de trafic à sauts de fréquence lents, qui présente un second ensemble de fréquences porteuses de sauts, est établi entre la première et la deuxième unité de communication. Des paquets de données sont transmis sur un des intervalles de temps, à partir de la première unité de communication, vers la deuxième unité de communication, sur le canal de trafic à sauts de fréquence rapides, à un débit allant de 1 à 3 Mb/s. Des paquets de données sont transmis à partir de la première unité de communication, vers la deuxième unité de communication, sur le canal de trafic à sauts de fréquence lents, à un débit supérieur à 5 Mb/s. Certaines fréquences porteuses de sauts qui sont associées au canal de trafic à sauts de fréquence rapides sont réduites, afin de s'adapter au canal de trafic à sauts de fréquence lents. Le canal de trafic à sauts de fréquence rapides est établi entre la première unité de communication, la deuxième unité de communication et une troisième unité de communication et le canal de trafic à sauts de fréquence lents est établi entre la deuxième unité de communication et la troisième unité de communication. Le canal de trafic à sauts de fréquence rapides évite alors l'emplacement du canal de trafic à sauts de fréquence lents.
PCT/EP2000/009274 2000-07-10 2000-09-22 Gestion de ressources dans un systeme a sauts de frequence non coordonnes Ceased WO2002005448A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2000279060A AU2000279060A1 (en) 2000-07-10 2000-09-22 Resource management in uncoordinated frequency hopping system

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US21710200P 2000-07-10 2000-07-10
US60/217,102 2000-07-10
US22667500P 2000-08-22 2000-08-22
US60/226,675 2000-08-22
US09/666,298 US7180903B1 (en) 1999-05-10 2000-09-21 Resource management in uncoordinated frequency hopping system
US09/666,298 2000-09-21

Publications (1)

Publication Number Publication Date
WO2002005448A1 true WO2002005448A1 (fr) 2002-01-17

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WO (1) WO2002005448A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1732273A1 (fr) * 2005-06-10 2006-12-13 Broadcom Corporation Séparation de fréquences pour plusieurs dispositifs bluetooth résidants dans une plate-forme unique
US7638136B2 (en) 2003-03-04 2009-12-29 Intercell Ag Streptococcus pyogene antigens
US8372411B2 (en) 2003-04-15 2013-02-12 Intercell Ag S. pneumoniae antigens
WO2017143320A1 (fr) * 2016-02-19 2017-08-24 Texas Instruments Incorporated Canal de balise de large bande destiné aux systèmes de saut de fréquence
CN113348629A (zh) * 2018-12-29 2021-09-03 华为技术有限公司 通信方法和装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5926501A (en) * 1996-12-12 1999-07-20 Motorola, Inc. Method and apparatus for dynamic channel configuration
US6018543A (en) * 1997-05-21 2000-01-25 Itt Manufacturing Enterprises, Inc. Noisy channel avoidance method in a digital communication system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5926501A (en) * 1996-12-12 1999-07-20 Motorola, Inc. Method and apparatus for dynamic channel configuration
US6018543A (en) * 1997-05-21 2000-01-25 Itt Manufacturing Enterprises, Inc. Noisy channel avoidance method in a digital communication system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
KAROL M J ET AL: "TIME-FREQUENCY-CODE SLICING: EFFICIENTLY ALLOCATING THE COMMUNICATIONS SPECTRUM TO MULTIRATE USERS", IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY,IEEE INC. NEW YORK,US, vol. 46, no. 4, 1 November 1997 (1997-11-01), pages 818 - 826, XP000754819, ISSN: 0018-9545 *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7638136B2 (en) 2003-03-04 2009-12-29 Intercell Ag Streptococcus pyogene antigens
US8372411B2 (en) 2003-04-15 2013-02-12 Intercell Ag S. pneumoniae antigens
EP1732273A1 (fr) * 2005-06-10 2006-12-13 Broadcom Corporation Séparation de fréquences pour plusieurs dispositifs bluetooth résidants dans une plate-forme unique
US7647023B2 (en) 2005-06-10 2010-01-12 Broadcom Corporation Frequency separation for multiple bluetooth devices residing on a single platform
WO2017143320A1 (fr) * 2016-02-19 2017-08-24 Texas Instruments Incorporated Canal de balise de large bande destiné aux systèmes de saut de fréquence
US10091786B2 (en) 2016-02-19 2018-10-02 Texas Instruments Incorporated Wideband beacon channel for frequency hopping systems
US10813094B2 (en) 2016-02-19 2020-10-20 Texas Instruments Incorporated Wideband beacon channel for frequency hopping systems
US11477788B2 (en) 2016-02-19 2022-10-18 Texas Instruments Incorporated Wideband beacon channel for frequency hopping systems
CN113348629A (zh) * 2018-12-29 2021-09-03 华为技术有限公司 通信方法和装置
CN113348629B (zh) * 2018-12-29 2023-07-07 华为技术有限公司 通信方法和装置

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Publication number Publication date
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