EP1999870A2 - Regroupement par un émetteur-récepteur à réutilisation du spectre, de segments de voie disjoints à bande relativement étroite (voix) du spectre radio destiné à des applications de communication rf à large bande - Google Patents

Regroupement par un émetteur-récepteur à réutilisation du spectre, de segments de voie disjoints à bande relativement étroite (voix) du spectre radio destiné à des applications de communication rf à large bande

Info

Publication number
EP1999870A2
EP1999870A2 EP07752756A EP07752756A EP1999870A2 EP 1999870 A2 EP1999870 A2 EP 1999870A2 EP 07752756 A EP07752756 A EP 07752756A EP 07752756 A EP07752756 A EP 07752756A EP 1999870 A2 EP1999870 A2 EP 1999870A2
Authority
EP
European Patent Office
Prior art keywords
bandwidth
channels
disjoint
sub
overall
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.)
Withdrawn
Application number
EP07752756A
Other languages
German (de)
English (en)
Other versions
EP1999870A4 (fr
Inventor
Edward C. Gerhardt
Paul G. Greenis
William R. Highsmith
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.)
Investors Life Insurance Corp
Original Assignee
Data Flow Systems 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
Priority claimed from US11/532,306 external-priority patent/US7920538B2/en
Application filed by Data Flow Systems Inc filed Critical Data Flow Systems Inc
Publication of EP1999870A2 publication Critical patent/EP1999870A2/fr
Publication of EP1999870A4 publication Critical patent/EP1999870A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/02—Hybrid access

Definitions

  • the present invention relates in general to communication systems and subsystems thereof, and is particularly directed to a radio frequency (RF) communications spectrum usage methodology, that takes advantage of the clear channel assessment and frequency-hopping functionality of the spectral reuse transceiver disclosed in the above-identified '753 application, to effectively aggregate a plurality of disjoint, relatively narrowband (e.g., voice) RF channels into an overall bandwidth for accommodating relatively wideband applications, such as, but not limited to the transmission of data and/or video.
  • RF radio frequency
  • a number of (primary) RF spectrum users such as, but not limited to, public service entities (e.g., police, fire, and utility service organizations) , have been licensed by the Federal Communications Commission (FCC) to use one or more, relatively narrowband, radio channels, which were originally intended to support analog voice services (such as push-to-talk radio communications) .
  • FCC Federal Communications Commission
  • the channels that have been allocated to a given licensee will likely, over time, include a plurality of different bandwidth segments, such as one or more of 50 KHz, 25 KHz, 12.5 KHz and 6.25 KHz segments, which are not necessarily and are not expected to be mutually spectrally contiguous.
  • the channels which a primary user will have been licensed to use will typically be separated from one another by one or more other channels or bandwidth segments (gaps 13) that have been licensed to other (primary/licensed) users.
  • the spectral disparity among the licensed channels results from the fact that they have been sequentially licensed to various users in response to incremental allocation requests, on the one hand, and due to the evolution of tighter spectral efficiency requirements that have been promulgated by the FCC to meet the continuously increasing demand for bandwidth.
  • a principal concern of these licensees is the efficient utilization of their allocated bandwidth.
  • a substantial number of licensees currently employ fixed-frequency, or manually channelized, radios.
  • these radios are relatively inexpensive, they offer poor utilization of the radio channels where they use a dedicated frequency, or pair of frequencies; if the radio is used only ten-percent of the time, ninety-percent of the available bandwidth is wasted.
  • additional radios could share the various channels of overall allocated segments of bandwidth by employing a ' listen-before-talk 1 user discipline.
  • Trunked radios offer an improvement over these stand-alone radio designs, since they are able to signal a repeater station, which then select a clear channel for the caller. While there I are a number of trunking protocols that may be employed, they all share a disadvantage that is also shared by other push-to-talk mechanisms - channelization of the radios cannot be changed, and efficiency of band usage may be low.
  • the radios described above and other similar radios are inflexible, in that they can be used only for a single, relatively narrowband, channel (such as a 12.5 KHz, 25 KHz or 50 KHz channel) , and must remain on that channel for the duration of the communication session - which prevents efficient utilization of the user's allocated bandwidth. Moreover, being relatively narrow bandwidth devices, these radios are unable to provide relatively high bandwidth services, such as Ethernet and Internet Protocol (IP) digital services.
  • IP Internet Protocol
  • advantage is taken of the clear channel detection and frequency agile functionality of the spectral reuse transceiver of the '753 application to determine which ones of a plurality of disjoint primary channels (that have been licensed to the user or to one or more other users that have agreed to share their licensed channel allocations) are not being used (e.g., have released the push-to-talk buttons of their radios) and, based upon this lack of use detection, to effectively 'aggregate' these multiple disjoint channels into an overall totality of potentially available bandwidth, the spectral extent of which is at least sufficient to meet a prescribed, relatively high bandwidth requirement (such as, but not limited to the transmission of data and/or video) , that could not otherwise be satisfied by a conventional, single channel radio.
  • a prescribed, relatively high bandwidth requirement such as, but not limited to the transmission of data and/or video
  • Figure 1 diagrammatically illustrates a non-limiting example of a distribution of relatively narrowband communication channels of differing bandwidths that may be licensed to a primary user of such channels;
  • Figure 3 diagrammatically illustrates the manner in which the plurality of disjoint, different bandwidth user channels of the channel distribution example of Figure 1 is aggregated into an overall bandwidth or channel space that is subdivided into a plurality of sub-channels, in accordance with the methodology of the present invention.
  • the invention essentially involves enabling the spectral reuse transceiver disclosed in the above- referenced '753 application to perform additional functionality - that of effecrtively aggregating a plurality of disjoint, relatively narrowband (e.g., voice) RF channels into an overall totality of potentially available bandwidth, that is considerably wider than any individual licensed narrowband channel, and is able to accommodate relatively wideband applications, such as, but not limited to the transmission of data and/or video.
  • relatively narrowband e.g., voice
  • this additional functionality is readily implemented by simply setting the configuration parameters that are used by the communications controller of the transceiver disclosed in the "753 application to control the operation of the transceiver.
  • the architecture of the transceiver of the "753 application remains unchanged.
  • the present invention has been illustrated in the drawings by readily understandable diagrammatic illustrations, which include a generalized network architecture diagram, and a channel aggregation and sub-channel sub-division diagram, that show only those details that are pertinent to the invention, so as not to obscure the disclosure with details which will be readily apparent to one skilled in the art having the benefit of the description herein.
  • the network includes a hub, or 'master* terminal unit site 10, and a plurality of 'remote 1 terminal unit (RTU) sites 12, at which spectral reuse transceivers of the type disclosed in the '753 application are located.
  • RTU 'remote 1 terminal unit
  • the architecture of the transceiver is unchanged.
  • the spectral activity-based link utilization control mechanism employed by the transceiver's communication controller confines its clear channel assessment routine to particularly identified primary channels, in particular, those (typically disjoint) primary channels that have been licensed to one or more prescribed primary users of a given user band (e.g., the 217-220 MHz band), and an aggregation of the respective bandwidth segments effectively produces an overall bandwidth that enables the radio to be used for wideband applications.
  • a given user band e.g., the 217-220 MHz band
  • the master site periodically initiates a clear channel assessment routine that compiles a list of primary channels available for use in wideband applications by the primary user(s), based upon an examination of only primary communication channels which have been licensed to a specifically identified primary user or users.
  • This primary channel allocation information which is directly obtainable from the FCC, is used to establish, a priori, configuration parameters of the transceivers of the prescribed primary user(s), so that the clear channel assessment routine will be confined to only the pre-specified channels of interest.
  • the primary channels of the compiled list will thus be those channels of the aggregated band which are not being currently used, and are therefore available to subdivided into sub-channels that may be assembled in respective sub-sets of sub-channels for use in a wideband application by the primary channel user(s).
  • one or more primary users is meant that the invention may be used to aggregate not only primary channels that have been licensed to a single user, but primary channels that have licensed to plural users who have decided to 'pool' their resources, in order to increase bandwidth capacity.
  • city and county . emergency service providers may decide to aggregate their primary channels into- a single aggregated band.
  • channels are channels. The transceiver operates on whatever channels are identified in accordance with its configuration parameters.
  • each remote user site sequentially steps through and monitors the current list of clear channels (of the 'aggregated' band) that it has previously obtained from the master unit, in accordance with a pseudo random hopping sequence that is known, a priori, by all the users of the aggregated band, for a message that may be transmitted to it by the master site.
  • a pseudo random hopping sequence that is known, a priori, by all the users of the aggregated band, for a message that may be transmitted to it by the master site.
  • each such user's transceiver scans all (6.25 KHz) sub-channels, or frequency bins, within the aggregated band for the presence of RF energy. Any bin containing energy above a prescribed threshold is marked as a non-clear channel, while the remaining channels of the aggregated band are marked as clear channels available for wideband signaling applications.
  • a remote site Whenever a remote site notices a change in its clear channel assessment, it reports this to the master at the first opportunity.
  • the master site When the master site has received clear channel lists from all the remote sites, it logically combines all of the clear channel lists from all the interrogated remote transceivers to produce a composite clear channel list.
  • This composite clear channel list is stored in the master site's transceiver and is broadcast to all of the remote transceivers over a prescribed one of the clear channels that is selected in accordance with a PN sequence through which clear channels are selectively used among the users of the aggregated channel band.
  • the clear channel list When the clear channel list is received at a respective remote transceiver, it is stored.
  • the master site's transceiver transmits an initialization message on an a priori established clear channel (preamble channel) , which each of the remote transceivers monitors.
  • This initialization message contains the aggregate clear channel list, the preamble channel (and the next preamble channel) , a PN sequence tap list, and the PN seed that defines the initial channel and hopping sequence for the duration of an upcoming transmit burst.
  • a remote transceiver Once a remote transceiver has received an initialization message, that transceiver transitions to normal multiple access mode, as described in the '753 application. For further details of the transceiver with which the invention may be employed, attention may be directed to the '753 application.
  • Figure 3 illustrates the manner in which the plurality of disjoint and differing bandwidth (50 KHz, 25 KHz, 12.5 KHz and 6.25 KHz) primary user channel segments of the example of Figure 1, described above, are 'aggregated 1 in accordance with the present invention into a composite channel space 15, as well as the subdivision of this aggregation of primary channels into an associated plurality of equal bandwidth (e.g., 6.25 KHz) narrowband subchannels within a sub-divided channel space 16.
  • an associated plurality of equal bandwidth e.g., 6.25 KHz
  • being disjoint user channels means that, within the overall radio band 11, there are one or more additional segments 12 of interleaved bandwidth, not allocated to primary channel licensees, that occupy one or more portions of the radio frequency spectrum between two or more of the primary channels 14 that have been allocated to a prescribed user (or users) .
  • the interleaved (non-user channel) bandwidth segments 12 cause a fragmentation of the user's overall licensed bandwidth into relatively small bandwidth segments 14, which limits the potential utilization of the overall user channel bandwidth by a conventional fixed- frequency, or manually channelized, radio, described above.
  • this confinement of the transceiver's operational spectrum may be represented as an aggregation of the individual bandwidths of such channels into a composite channel space 15, in which the respective narrow bandwidth channels 14 within band 11 are shown as being mutually spectrally contiguous with one another, in order to illustrate the considerable overall bandwidth that is available within these channels.
  • the respective disjoint channels 14 of the primary user channel band 11 of Figure 1 are shown as being effectively 'mapped' into mutually abutting relationship as an aggregated channel space 15 comprising user channels 25 - 20 - 20 - 21 - 20 - 21 - 22, which, as a whole, represent an overall bandwidth that is considerably wider than any one of the disjoint channels.
  • the aggregated channel space 15 is subdivided into a plurality of relatively narrowband • subchannels lying within the sub-divided channel space 16. It.
  • a relatively wideband signal such as but not limited to a digital data or video signal (the data rate of which is considerably wider than any individual one of of the disjoint narrowband channels 14) is modulated, and among which the transceiver hops during a communication session with the hub or master site, in the manner described in the above-referenced '753 application.
  • a relatively wideband signal such as but not limited to a digital data or video signal (the data rate of which is considerably wider than any individual one of of the disjoint narrowband channels 14) is modulated, and among which the transceiver hops during a communication session with the hub or master site, in the manner described in the above-referenced '753 application.
  • the composite spectral representation of the channel space 15 does not mean that the channels 14 themselves have been spectrally shifted or changed so that they become mutually contiguous. The user channels 14 remain unchanged. Rather the composite spectral space illustrates the overall or total bandwidth that the transceiver of the '753 application is
  • each sub-channel within the sub-divided channel space 16 has a bandwidth corresponding to that of the narrowest channel bandwidth segment of all the aggregated user channels.
  • the narrowest user channel bandwidth segment is 6.25 KHz wide; therefore, each sub-channel within sub-divided channel space 16 is a 6.25 KHz wide sub-channel.
  • the single 6.25 KHz wide user channel 25 of channel space 15 will produce a single 6.25 KHz hopped subchannel 24, while each of the 12.5 KHz user channels 20 of channel space 15 will produce a pair of mutually contiguous 6.25 KHz hopped sub-channels 17.
  • each 25 KHz user channel 21 within channel space 15 will produce four subchannels, that include two 'outer 1 6.25 KHz sub-channels 18 that are contiguous with the 'outer' edges of their associated 25 KHz user channel, and two 'inner' 6.25 KHz sub-channels 19, that are contiguous with the center frequency of their associated 25 KHz user channel.
  • the 50 KHz user channel 22 of channel space 15 produces two pairs of mutually contiguous 'inner' 6.25 KHz sub-channels 22, and two pairs of contiguous 'outer' 6.25 KHz sub-channels 23.
  • the channel space 15 of the illustrated example is shown comprising allocated user channels that have been aggregated from channels lying in a single band, it is to be understood that the continuous channel space may be aggregated from user channels lying in a plurality of bands, without a loss in generality.
  • the term 'band' is not limited to any particular portion or portions of the radio frequency spectrum. For example, it may cover the entire range of UHF frequencies (the UHF band) . In addition, or alternatively, it may also encompass administrative or regulatory subdivisions of larger bands, such as the 420-450 MHz UHF band, or the yet smaller police band within the 420-450 MHz band.
  • transceiver Since the functionality of the transceiver described in the '753 application includes its ability to selectively frequency hop among all (6.25 KHz) sub-channels, or any selected number or sub-set, of the sub-channels of the (aggregated) channel space in a controlled manner, and to modulate an information signal of interest upon these hopped sub-channels, in accordance with the aggregation methodology of the present invention, that transceiver is able to optimize its utilization of the total available bandwidth of all of the disjointed user channels that have been mapped into the aggregated channel space. This provides a significant performance advantage over conventional fixed-frequency or manually agile radios.
  • the selective frequency-hopping radio of the '753 application is able to selectively hop among (the sub-divided sub-channels of) the entire aggregated allocation of user channels, it is able to provide a significant gain in throughput efficiency gain afforded by packet multiplexing.
  • conventional analog push-to-talk radios may be unable to complete a call, if the required allocation is not available. Namely, if no 25 KHz user channel is available for a conventional 25 KHz radio, that radio will be unable to place a call, even if there are two or more 12.5 KHz user channels available.
  • the selective frequency-hopping radio of the "753 application used in the methodology is able to frequency hop among any of the sub-channels within the aggregated channel space, it is readily able to access the (25 KHz) bandwidth required to complete the call.
  • digital radios can provide voice, video and data service capabilities at adjustable- or selectable qualities of service and voice or image quality.
  • spare capacity in the aggregated network may be used for a variety of data services, including Ethernet bridging and IP, which are not be readily available in conventional or trunked analog voice services.
  • the methodology of the present invention enables the functionality of the spectral reuse radio described in the '753 application to aggregate the various licensed users' bandwidths, so that users may enjoy these and other services .
  • one organization may have only conventional or trunked analog radios, and therefore have no access to digital services, such as Ethernet-bridging, IP (Internet Protocol) applications and others.
  • digital services such as Ethernet-bridging, IP (Internet Protocol) applications and others.
  • spectral reuse transceiver system described in the '753 application to aggregate multiple disjoint bandwidth segments, users are able to enjoy digital services. Users can employ the aggregated bandwidth to • the extent that is appropriate to a respective organization. For example, users of the aggregated bandwidth may continue to use their analog radios in a normal manner as well as for IP applications. Similarly, users may replace some or all of their analog radios with the radio described in the '753 application, and configured in accordance with the invention to aggregate bandwidth, to take advantage of digital services and more throughput, as needed.
  • an allocated user band that is shared by a collection of organizations which, individually, may have a relatively small allocation- but, as a whole, has a relatively large allocation, is the 450- 470 MHz band in the United States.
  • This band is available to various public safety groups, such as firefighters and police, as well as some businesses and other applications. Aggregating some or all of the band allows all participants in the aggregated bandwidth to have access to a much larger range of dynamic bandwidth and provides for a host of new applications.
  • One such application involves pooling all public safety allocations; this enables various public safety organizations to continue to use their present radio assets, while adding new ones as needed for new services.
  • An example of such a new service is to provide critical imagery data, such as building drawings, to fire department personnel in real time, prior to having fire-fighters enter a distressed building.
  • Providing imagery data generally requires the use of IP service, which is currently unavailable to many public safety organizations. For example, pooling multiple public service allocations that provide an aggregated bandwidth on the order of 200 KHz will accommodate multiple sub-sets of forty (4 KB) sub-channels, the composite bandwidth of each of which is 160 kilobits, which will readily transport data and/or imagery.
  • the bandwidth aggregation methodology of the invention may also be used to provide a digital network for providing communications between different public safety organizations (inter-operability) . It is presently estimated that such communications will not be widely available in the United States until the year 2023- at a cost of US $60 billion, without a significant change in current planning.
  • Using the present invention to aggregate public safety bandwidth allocations enables inter-operability at the network layer, rather than the physical layer. This provides a significant advantage, since achieving inter-operability using established network protocols (such as IP) is much more obtainable than requiring all devices (from various manufacturers) to have the same radio physical layer.
  • Using the invention to aggregate public safety bandwidth for Internet access will allow police to quickly acquire information about a suspect driver, for example. Providing Internet access in this manner will also supply a conduit for the above-referenced example of making building drawing images available to fire department personnel.
  • the invention may also be used to aggregate disjointed public safety bandwidth into what may be termed an 'Event Coordination Channel'.
  • a channel may be used to provide a special service through which various public safety organizations may obtain information about a public safety 'event 1 , such as a fire, explosion, or hostage situation.
  • this Event Coordination Channel comprises a single service that is available to all public service organizations, and serves to produce more complete and consistent information, compared to multiple, parallel services (or worse, no such service) .
  • Such an aggregation of bandwidth allows commonly available content management systems (CMSs) having various security levels to be shared, so as to jointly produce event information as it becomes available.
  • CMSs content management systems
  • the users of this service may select from a list of events on the radio access device to view the information for a specific event.
  • ESN electronic serial number
  • the ESNs may contain sub-fields which identify, for example, the organization, classes and subclasses within the organization.
  • the radios' repeaters may operate in a repeater-to- repeater mode, as a backup, in case wired-connectivity between repeaters becomes unavailable. This provides increased robustness to the network.
  • the repeaters may continuously poll their neighbors over the wired network and fall back to (possibly reduced bandwidth) radio connections.
  • Another advantage of the invention is that it allows users outside the licensed group to employ the pooled bandwidth on a secondary- use basis. This provides higher utilization of radio bandwidth.
  • the ESN mechanism may be used to disable secondary users during a public emergency.
  • the interference-detection (clear channel assessment) functionality of the spectral reuse transceiver of the '753 application may also be employed to enable sharing of the continuous channel space resulting from the aggregation of the disjointed user channels by a mixture of conventional and digital radios.
  • the interference-detection functionality of the spectral reuse transceiver may be used to detect the activity of conventional radios that employ user channels within the aggregated band on an equal basis with other radios in the aggregated band.
  • Licensees may be motivated to allow a mixture of analog and digital radios due to the • cost of complete equipment replacement; thus, some analog radios may continue to operate without change, while the network enjoys the advantages of the present invention, improving spectral efficiency for new installations or replacement radios in a phased replacement program.
  • the bandwidth usage control methodology of the present invention enables that receiver to effectively 'aggregate' disjoint user channels into an overall totality of potentially available bandwidth, the spectral extent of which is at least sufficient to meet a prescribed, relatively high bandwidth requirement (such as, but not limited to the transmission of data and/or video) , that could not otherwise be satisfied by a conventional, single channel-based radio.
  • the frequency agile capability of the spectral reuse transceiver of the '753 application is employed to selectively hop among subchannels of respectively different sub-channel subsets, that are pseudo-randomly assembled from among all of the available sub-channels into which the aggregate band has been subdivided.

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

Abstract

Une méthodologie de commande de l'utilisation de la largeur de bande utilise la détection de la voie libre et la fonctionnalité d'agilité de fréquence d'un émetteur-récepteur à réutilisation du spectre pour 'regrouper' de manière efficace les voies d'utilisateur disjointes sous forme d'une largeur de bande globale dont l'étendue spectrale est au moins suffisante pour correspondre à un besoin élevé en largeur de bande (tel que, mais sans limitation, pour la transmission de données/vidéo) qui ne peut être obtenue par une voie radio unique, classique.
EP07752756A 2006-03-20 2007-03-09 Regroupement par un émetteur-récepteur à réutilisation du spectre, de segments de voie disjoints à bande relativement étroite (voix) du spectre radio destiné à des applications de communication rf à large bande Withdrawn EP1999870A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US78410506P 2006-03-20 2006-03-20
US11/532,306 US7920538B2 (en) 2003-12-08 2006-09-15 Spectral reuse transceiver-based aggregation of disjoint, relatively narrow bandwidth (voice) channel segments of radio spectrum for wideband RF communication applications
PCT/US2007/006078 WO2007108963A2 (fr) 2006-03-20 2007-03-09 Regroupement par un émetteur-récepteur à réutilisation du spectre, de segments de voie disjoints à bande relativement étroite (voix) du spectre radio destiné à des applications de communication rf à large bande

Publications (2)

Publication Number Publication Date
EP1999870A2 true EP1999870A2 (fr) 2008-12-10
EP1999870A4 EP1999870A4 (fr) 2011-09-14

Family

ID=38522999

Family Applications (4)

Application Number Title Priority Date Filing Date
EP07752756A Withdrawn EP1999870A4 (fr) 2006-03-20 2007-03-09 Regroupement par un émetteur-récepteur à réutilisation du spectre, de segments de voie disjoints à bande relativement étroite (voix) du spectre radio destiné à des applications de communication rf à large bande
EP07752772A Withdrawn EP2002567A4 (fr) 2006-03-20 2007-03-09 Mécanisme de commande de saut de fréquence intelligent permettant d'atténuer le déclenchement de circuits de réglage de radios silencieuses par des émissions de sous canal d'émetteur récepteur à réutilisation spectrale
EP07753333A Withdrawn EP2005654A4 (fr) 2006-03-20 2007-03-16 Techniques pour générer et utiliser une carte de réservation
EP07753332A Withdrawn EP2011252A4 (fr) 2006-03-20 2007-03-16 Protocole d'incursion permettant d'accéder aux voies

Family Applications After (3)

Application Number Title Priority Date Filing Date
EP07752772A Withdrawn EP2002567A4 (fr) 2006-03-20 2007-03-09 Mécanisme de commande de saut de fréquence intelligent permettant d'atténuer le déclenchement de circuits de réglage de radios silencieuses par des émissions de sous canal d'émetteur récepteur à réutilisation spectrale
EP07753333A Withdrawn EP2005654A4 (fr) 2006-03-20 2007-03-16 Techniques pour générer et utiliser une carte de réservation
EP07753332A Withdrawn EP2011252A4 (fr) 2006-03-20 2007-03-16 Protocole d'incursion permettant d'accéder aux voies

Country Status (5)

Country Link
EP (4) EP1999870A4 (fr)
CN (4) CN101507157A (fr)
AU (6) AU2007227711A1 (fr)
CA (4) CA2647023A1 (fr)
WO (2) WO2007109170A2 (fr)

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US8155649B2 (en) 2006-05-12 2012-04-10 Shared Spectrum Company Method and system for classifying communication signals in a dynamic spectrum access system
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US8055204B2 (en) * 2007-08-15 2011-11-08 Shared Spectrum Company Methods for detecting and classifying signals transmitted over a radio frequency spectrum
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US8184653B2 (en) 2007-08-15 2012-05-22 Shared Spectrum Company Systems and methods for a cognitive radio having adaptable characteristics
US8027249B2 (en) 2006-10-18 2011-09-27 Shared Spectrum Company Methods for using a detector to monitor and detect channel occupancy
US9538388B2 (en) 2006-05-12 2017-01-03 Shared Spectrum Company Method and system for dynamic spectrum access
EP2319260A2 (fr) 2008-08-19 2011-05-11 Shared Spectrum Company Procédé et système d'accès à un spectre dynamique à l'aide de détecteurs de spécialité et d'une mise en réseau améliorée
FR2969436A1 (fr) 2010-12-21 2012-06-22 France Telecom Protection contre la detection de signaux d alerte
US10159073B2 (en) * 2015-07-20 2018-12-18 Rockwell Collins, Inc. Systems and method for adaptive frequency management utilizing multiple frequency sets
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AU2011250677A1 (en) 2011-12-01
WO2007109169A3 (fr) 2008-11-27
EP2005654A4 (fr) 2011-03-09
WO2007109170A3 (fr) 2008-10-09
WO2007109170A2 (fr) 2007-09-27
CA2647023A1 (fr) 2007-09-27
EP1999870A4 (fr) 2011-09-14
CN101502024A (zh) 2009-08-05
EP2011252A4 (fr) 2011-11-30
WO2007109169A9 (fr) 2009-01-08
AU2007227711A1 (en) 2007-09-27
CA2646736A1 (fr) 2007-09-27
EP2002567A4 (fr) 2011-08-17
AU2007227708A1 (en) 2007-09-27
EP2005654A2 (fr) 2008-12-24
CN101507146A (zh) 2009-08-12
AU2011250678A1 (en) 2011-12-01
EP2011252A2 (fr) 2009-01-07
WO2007109169A2 (fr) 2007-09-27
EP2002567A2 (fr) 2008-12-17
CN101507157A (zh) 2009-08-12
AU2007227452A1 (en) 2007-09-27
CA2645424A1 (fr) 2007-09-27
CA2647022A1 (fr) 2007-09-27
AU2007227451A1 (en) 2007-09-27
CN101461189A (zh) 2009-06-17

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