WO2007034461A2 - Systèmes sans fil multivoie comportant des voies de rendez-vous dynamiques - Google Patents

Systèmes sans fil multivoie comportant des voies de rendez-vous dynamiques Download PDF

Info

Publication number
WO2007034461A2
WO2007034461A2 PCT/IB2006/053483 IB2006053483W WO2007034461A2 WO 2007034461 A2 WO2007034461 A2 WO 2007034461A2 IB 2006053483 W IB2006053483 W IB 2006053483W WO 2007034461 A2 WO2007034461 A2 WO 2007034461A2
Authority
WO
WIPO (PCT)
Prior art keywords
wireless
channels
recited
network
stas
Prior art date
Application number
PCT/IB2006/053483
Other languages
English (en)
Other versions
WO2007034461A3 (fr
Inventor
Carlos De Morais Cordeiro
Chun-Ting Chou
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2007034461A2 publication Critical patent/WO2007034461A2/fr
Publication of WO2007034461A3 publication Critical patent/WO2007034461A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access

Definitions

  • the wireless communication bandwidth has significantly increased making the wireless medium a viable alternative to wired and optical fiber solutions .
  • wireless connectivity in data and voice communications continues to increase.
  • These devices include mobile telephones, portable computers in wireless networks (e.g., wireless local area networks (WLANS) , stationary computers in wireless networks, portable handsets, to name only a few.
  • WLANS wireless local area networks
  • wireless applications continue to grow, so do the numbers of devices, networks and systems vying for the communications spectrum.
  • there are dedicated or licensed portions as well as unlicensed portions of the communications spectrum. Because the unlicensed (public) bands of the spectrum may be accessed freely, these bands tend to be heavily populated by users. Contrastingly, recent studies indicate that only a small portion of the licensed band is being used.
  • the MC wireless networks may be implemented in dedicated portions of the communications spectrum.
  • the MC wireless network may operate in a spectrum normally dedicated for television transmission and reception. Thereby, certain portions of the communications band may be more fully utilized.
  • CMOS complementary metal-oxide-semiconductor
  • RC rendezvous channel
  • the MC wireless network were operating in a licensed or dedicated portion of the communications spectrum (e.g., television (TV) bands), and an incumbent device (s) began to broadcast over the channel occupied by the RC, the use of the RC by the devices of the MC wireless network must cease as the incumbent device has priority over the MC wireless network. This can result in a disruption in wireless communication over the network. Accordingly, what is needed is a wireless network and method that overcomes at least the shortcomings of the known networks described above.
  • a licensed or dedicated portion of the communications spectrum e.g., television (TV) bands
  • an incumbent device s
  • a wireless system includes a plurality of wireless devices and a plurality of wireless channels available to the plurality of wireless devices.
  • the wireless system also includes a rendezvous channel selected from among the plurality of wireless channels.
  • the wireless system is adapted to change the rendezvous channel to another one of the plurality of wireless channels.
  • a method of wireless communication includes scanning a plurality of wireless channels and selecting from the plurality of wireless channels a rendezvous channel for devices in a wireless network.
  • Fig. IA is a simplified schematic diagram of neighboring wireless networks in accordance with an example embodiment.
  • Fig. IB is a simplified schematic of neighboring wireless networks in accordance with an example embodiment.
  • Fig. 2 is a conceptual diagram of a multi-channel (MC) structure in accordance with an example embodiment.
  • Fig. 3 is a flow-chart of a method of wireless communication in accordance with an example embodiment.
  • Fig. 4 is a flow-chart of a method of wireless communication in accordance with an example embodiment.
  • the network may be a wireless network with a centralized architecture or a decentralized architecture.
  • the network may be one which functions under a MC Medium Access (MAC) layer, such as to be defined under IEEE 802.22, or as defined under IEEE 802.16, IEEE 802.11, or IEEE 802.15.
  • MAC Medium Access
  • the network may be a cellular network; a wireless local area network (WLAN) ; a wireless personal area network (WPAN) ; or a wireless regional area network (WRAN) protocols .
  • WLAN wireless local area network
  • WPAN wireless personal area network
  • WRAN wireless regional area network
  • the MAC protocol may be a time division multiple access (TDMA) protocol; a carrier sense multiple access (CSMA) protocol; a CSMA with collision avoidance (CSMA/CA) protocol; or a frequency division multiple access (FDMA) protocol.
  • TDMA time division multiple access
  • CSMA carrier sense multiple access
  • CSMA/CA CSMA with collision avoidance
  • FDMA frequency division multiple access
  • Fig. IA is a schematic view of a first wireless network 101 and a second (neighboring) wireless network 102 in accordance with an illustrative embodiment.
  • the first and second wireless networks 101, 102 are centralized networks.
  • the first wireless network 101 includes a first access point (AP) 103 and the second wireless network 102 includes a second AP 105.
  • the first wireless network 101 further comprises a plurality of wireless stations (STAs) 104, which also may be referred to as wireless devices.
  • the second wireless network 102 includes a plurality of STAs (devices) 106.
  • the first and second networks 101, 102 each may be one of the type of networks noted previously.
  • the STAs 104, 106 may be computers, mobile telephones, personal digital assistants (PDA) , or similar device that typically operates in such networks.
  • the STAs 104,106 may communicate bilaterally; and the APs 103,105 and respective devices 104,106 may communicate bilaterally.
  • STAs 104,106 are shown; this is merely for simplicity of discussion. Clearly, many other STAs 104,106 may be used. Finally, it is noted that the STAs 104,106 are not necessarily the same. In fact, a plethora of different types of STAs adapted to function under the chosen protocol may be used within the networks 101, 102.
  • the MAC layers of the first and second networks 101, 102 are MC MAC layers.
  • each of the STAs 104, 106 and each of the APs 103,105 may communicate in one of a plurality channels 201-204, which are shown in Fig. 2.
  • M-channels may be licensed or dedicated channels, for example as administered by the FCC of the U.S.A.
  • devices that are licensed to function in the plurality of channels referred to as incumbent devices
  • the incumbent devices have priority over the STAs 104, 106 and the APs 103, 105. That is, the incumbent devices can reclaim the licensed channels at any time, for example by initiating transmissions in these channels. Therefore, the STAs 104,106 and APs 103,105 are adapted to sense and detect the presence of incumbent devices and vacate the reclaimed channels in a timely fashion.
  • the N-channels and the M-channels may be unlicensed channels that may have priority access provisions, whereby certain (incumbent) devices have priority over other devices; notably the STAs 104, 106 and APs 103, 105.
  • the RC may again be occupied by the STAs 104,106 and the APs 103,105.
  • one of the channels 201-204 is selected to be the RC by the AP 103.
  • the second AP 105 selects one of the M channels to be the RC of the second network 102.
  • the APs 103, 105 may select another of their respective plurality of channels to be a backup RC to its respective RC.
  • the RC serves as a control channel for the STAs of a network.
  • a network is defined as one or more STAs that share a common RC.
  • the APs 103, 105 and the STAs 104,106 are adapted to communicate via respective channels of their networks.
  • the APs 103, 105 will transmit beacon frames having an RC field indicating which channel is the RC of its respective network and thus which channels is used as a coordination channel of the STAs 104,106.
  • the APs 103, 105 will transmit beacons when the RC channel is going to change or has changed.
  • Each of the STAs 104,106 operates in one of the respective channels of its network and transmits a beacon in the channel in which it is operating.
  • the STAs 104, 106 also scan the channels and to make measurements of the quality of service (QoS) of other channels, as well as to determine if STAs of neighboring networks are present.
  • the scanning can be periodic with a period being determined by channel dynamics. Alternatively, the scanning may be sporadic with the STAs only scanning the channels when the QoS of its current channel falls below a predetermined threshold.
  • the time an STA scans a particular channel also varies and depends on the ongoing activity in that channel.
  • the STAs 104,106 may change to a different channel, which provides a better QoS. Notably, the STAs 104, 106 may change to channels of neighboring networks.
  • a set of STAs may choose to switch to another RC. This set of STAs may effect the switch if, as a result of the switch, interference levels will decrease and the overall performance of the network will improve.
  • the STAs may switch to another RC if there are fewer STAs detected in the other RC.
  • the number of devices present in an RC may be gathered by monitoring the periodic beacon transmissions in the RC.
  • Fig. IB is a schematic diagram of a first wireless network 107 and a second (neighboring) wireless network 109 in accordance with an example embodiment.
  • the first and second networks 107, 109 are distributed wireless networks, which do not include an AP.
  • the first wireless network 107 includes a plurality of STAs 108 and the second network 109 includes a second plurality of STAs 110.
  • the STAs may be of the types described in connection with the networks of Fig. IA. Furthermore, there may be more or fewer STAs than shown in Fig. IB and the STAs are not necessarily the same.
  • the first and second distributed networks 107 Like the centralized networks of the example embodiment of Fig. IA, the first and second distributed networks 107,
  • each network 107, 109 each have a MC MAC layer.
  • the STAs 108, 110 of each network 107, 109 may communicate with one another via one of a plurality of wireless channels.
  • the plurality of wireless channels over which the STAs 108, 110 may communicate may be licensed or unlicensed and may the subjected to priority access by incumbent devices as noted previously.
  • the distributed networks 107,109 of Fig. IB have RCs that are used as control channels for respective networks, among other functions.
  • an STA 108 may be operating in a channel ( ⁇ k') and periodically transmits a beacon indicating this operation. If the STA has selected channel k to be the RC by methods described herein, it will include this in an RC field in a transmitted beacon frame .
  • the STAs 108,110 of the first and second networks 107,109 scan the respective plurality of channels in their network. This scanning gathers information of channel quality and beacon frames from other STAs . Based on this information, each STA 108,110 of the distributed networks 107, 109 can determine the presence of RCs used by other STAs as well as the QoS of the RCs. As described previously, the determination of RCs may be carried out based on interference level, number of devices, and similar information .
  • Fig. 3 is a flow-chart of a method of operation of wireless network having a centralized MC MAC in accordance with an example embodiment. Illustratively, the method of Fig. 3 may be applied to the centralized networks of the example embodiment shown in Fig. IA.
  • the AP selects the RC. This initially occurs at network start-up when the AP has no associated devices.
  • the AP scans the available channels and selects a channel that will provide suitable, if not optimal QoS.
  • the AP transmits a beacon frame including an RC field.
  • the RC field indicates the RC and the time that the AP will begin transmitting and receiving via the RC.
  • the AP may transmit the beacon frame at the beginning of a superframe and may intermittently transmit the beacon frame during the superframe to alert new STAs of the RC or dormant STAs of the RC as they awake.
  • the STAs scan the channels of the network seeking the rendezvous channel field from the beacon frame of the AP.
  • step 303 may commence before step 302 and may continue after step 302 is completed.
  • the scanning begins when devices move into the network, or when the devices wake-up after a dormant period, or both. If a particular STA detects the beacon frame including the RC field (e.g., transmitted per step 302), the scanning of the channels may terminate and the STA then functions according to the protocol set forth by the AP. It is noted that the scanning of the channels may resume at a later time. In a specific embodiment, the scanning may resume at a later time to allow an STA to identify APs with better signal quality, due to mobility, frequency of operation, and similar factors.
  • an STA may detect more than one beacon frame.
  • the STA exacts measurements from each channel.
  • the measurements include, but are not limited to: the frequency of operation; the received signal strength and the list of available channels.
  • the STA chooses the RC and AP. This may result in the STA' s joining another RC and thus another network.
  • one or more of the STAs 106 may receive better signal quality from AP 103 than from AP 105, and selects the RC of AP 103.
  • the particular STA 106 will select the RC of AP 103 and thus join the first wireless network 101 and leave the second wireless network 102.
  • the STAs may continue to scan the channels of its network or, if neighboring networks are present, the channels of the neighboring network, or both. This scanning may be continually or continuously done after the RC has been identified. Through this scanning, the STAs continues to garner information on the QoS of the scanned channels. Notably, this scanning may be effected autonomously by the STAs or via instructions from the AP via the RC, for example. The information gathered may be reported back to the AP, or used by the STAs to determine whether to switch to another channel for communication, or both. Additionally, the STAs may switch to another AP and RC as a result of this scanning.
  • the AP of a centralized wireless network may need to change the RC of its network. This decision may result from measurements taken during scans performed by the AP, or performed by the STAs in the network. Alternatively, an incumbent device may begin to transmit in the RC channel. This preemption by an incumbent device may occur with or without notice.
  • the AP transmits a beacon frame with an RC beacon field indicating that a new RC has been chosen.
  • the beacon frame may be sent in the beginning of a superframe or periodically during a superframe, or both, and includes the new RC and the time at which the AP will commence using the new RC.
  • the STAs switch to the new RC.
  • the AP may determine that the QoS of the present RC is below a set standard, or that another channel provides better QoS, or both. In this case, the AP transmits the beacon frame providing a new RC and an appointed time to switch to the new RC.
  • some or all of the network STAs may switch to the new RC.
  • an incumbent device such as a TV station
  • the AP will then provide the beacon frame with the new RC and time of the change to the new RC. Again, at the appointed time, some or all of the STAs may switch to the new RC.
  • a beacon frame is not or cannot be sent informing the STAs of a switch to another RC in the future.
  • the incumbent signal may require termination of the use of the RC before such a beacon frame can be sent.
  • the beacon frame is sent by the AP including the RC field with the new RC.
  • the STAs will receive the beacon frame including the new RC.
  • the STAs Upon receiving the beacon frame, the STAs will switch to the new RC at step 305.
  • a backup RC may be sent in the beacon field of the beacon frame by the AP.
  • This backup RC is identified in case a sudden switch to another RC is required or because the primary RC is unavailable for other reasons.
  • the STAs Upon recognizing that the primary RC is no longer available (e.g., via channel scanning), the STAs will switch to the backup RC.
  • the AP may then scan the available channels and select another backup channel in case the present RC becomes unavailable.
  • the AP designates the backup RC in the RC field.
  • steps 302-305 may be repeated as needed.
  • one or more STA may switch to another network, or take no action.
  • one or more STA may have scanned channels of a neighboring network and based on these measurements, switched to the neighboring AP and RC.
  • one or more STAs 104 may switch to AP 105 and its RC based on the QoS data garnered in the scans.
  • STAs of neighboring networks may elect to switch to the RC of the AP of the other network. Additionally, the AP of one network may transmit a beacon field indicating that a switch to the RC of the neighboring network is mandated. In this case, the AP and the STAs of one network, join the neighboring network. Notably, the AP joining the neighboring network becomes an STA of that network upon the switch.
  • the AP 103 may send a beacon frame to some or all of the STAs that they should switch to the RC of AP 105 and thus join that network. If one some of the STAs 104 are switched, the AP 103 continues to function as described in connection with Figs. IA, 2 and 3. However, if all of the STAs 104 and the AP 103 join the second wireless network 102, the first wireless network ceases to exist.
  • this switch from one network to a neighboring network is random in nature. As such, this minimizes the event that the first wireless network 101 and the second wireless network 102 switch simultaneously to each other RCs. While this does not disrupt the system operation, it would likely delay the joining of the two networks.
  • Fig. 4 is a flow-chart of a method of operation of wireless network having a distributed MC MAC in accordance with an example embodiment. Illustratively, the method of Fig. 4 may be applied to the distributed networks of the example embodiments shown in Fig. IB.
  • each STA of the distributed network scans the available plurality of channels, collects measurements and seeks beacon frames.
  • the measurements may be: the received signal strength; the profile of the transmitter; the number of transmitters; and the interference and noise level. If an STA receives a beacon frame including an RC field from one or more neighboring
  • the STA determines the optimal RC from the measurements from each RC channel detected from the various beacon frames .
  • the STA(s) select the best RC.
  • step 403 if the STA does not receive a beacon frame with an RC field in a predetermined scanning period, or if none of the RCs available are of a suitable QoS, the STA can select an RC from the plurality of available channels based on QoS data garnered during scanning.
  • the STAs continue scanning available channels and collect measurements of the QoS of these channels. As such, if a channel becomes available that provide a higher QoS, the STA may select this channel as the RC channel and then switch to this channel subsequently. Moreover, during this scanning, the STA (s) may detect beacon frames with RC fields sent by STAs of the same network or of a neighboring network. For example, during scanning, one of the STAs 108 of the first distributed wireless network 107 may receive a beacon frame from another STA 108 indicating in an RC field that another RC is being used by that STA.
  • an STA 108 of the first distributed wireless network 107 may receive a beacon frame from an STA 110 of the second distributed wireless network 109 indicating the RC being used by that network. If no beacon frame with an RC field is obtained during this scanning, no action is taken and the scanning continues.
  • step 405 the STA returns to its primary RC and sends an RC switch announcement in the primary RC.
  • the announcement is carried out in step 405 and includes the new RC channel information and the time of the switch. All STAs using the primary RC record this information and at the expiration of a timer, they switch to the new RC. Upon completion of this switch, the method repeats beginning at step 401.
  • the switch from one RC to another may be within a distributed network or may be a switch of one or more STAs from one network to a neighboring network.
  • the switch is relatively random and thus it is highly improbable that different sets of STAs having different RCs will switch simultaneously. For example, if STAs 110 elect to switch to the RC of STAs 108, it is highly unlikely that STAs 108 will elect to switch to the RC of STAs 110 at the same time. As such, after a finite period of time all STAs in the same neighborhood will likely converge to the same RC. Thereafter, beacons are sent by each STA indicating the RC thereby preventing the switching of STAs back and forth to different RCs .
  • step 405 may be carried out because an incumbent signal elects to occupy the RC being used. If this occurs, the STA designating the RC will scan for other available channels per step 401 and will select another RC. After this selection the beacon frame with the RC fields are sent per steps 402-404. Like the centralized network, the beacon frame may be transmitted before the switch, indicating the appointed time of the switch; or may be transmitted after the switch, if the switch is sudden. In the former case, some or all of the STAs will switch to the new RC at the appointed time. In the latter case, the STAs continue scanning and will receive the beacon frame with the RC field. Alternatively, a backup RC may be provided in previous RC fields and the STAs switch to the backup RC.
  • the MC-MAC methods and apparati of the example embodiment enable STAs in the same area to communicate concurrently in different channels without significantly interfering with each another. This characteristic is very desirable especially in high load scenarios and for QoS sensitive traffic.
  • the MC-MAC methods and apparati of the example embodiments may be implemented in dynamic environments where the availability and quality of channels vary over time (e.g., new wireless technologies designed for the TV bands) .
  • Other added benefits include the availability of a rendezvous channel for nodes in the same neighborhood allows for effective broadcast/multicast support, interference mitigation and channel bonding.

Landscapes

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

Abstract

La présente invention a trait à un système dans fil et un procédé comprenant une couche de commande d'accès au support multivoie.
PCT/IB2006/053483 2005-09-26 2006-09-25 Systèmes sans fil multivoie comportant des voies de rendez-vous dynamiques WO2007034461A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US72065705P 2005-09-26 2005-09-26
US60/720,657 2005-09-26

Publications (2)

Publication Number Publication Date
WO2007034461A2 true WO2007034461A2 (fr) 2007-03-29
WO2007034461A3 WO2007034461A3 (fr) 2007-07-12

Family

ID=37834239

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2006/053483 WO2007034461A2 (fr) 2005-09-26 2006-09-25 Systèmes sans fil multivoie comportant des voies de rendez-vous dynamiques

Country Status (1)

Country Link
WO (1) WO2007034461A2 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009045646A2 (fr) * 2007-08-15 2009-04-09 Shared Spectrum Company Systèmes et procédés pour radio cognitive présentant des caractéristiques adaptables
WO2009072087A1 (fr) 2007-12-06 2009-06-11 Koninklijke Philips Electronics, N.V. Procédé de gestion de canaux dans un réseau radio cognitif à spectre réparti
WO2009098566A1 (fr) * 2008-02-04 2009-08-13 Nokia Corporation Procédé et dispositif pour faire fonctionner une radio cognitive dans un système collaboratif encombré
GB2470372A (en) * 2009-05-19 2010-11-24 Toshiba Res Europ Ltd Channel access in a cognitive radio network
USRE43066E1 (en) 2000-06-13 2012-01-03 Shared Spectrum Company System and method for reuse of communications spectrum for fixed and mobile applications with efficient method to mitigate interference
EP2001176A3 (fr) * 2007-06-08 2013-01-23 Imec Procédé de configuration d'une communication multicanaux
US8997170B2 (en) 2006-12-29 2015-03-31 Shared Spectrum Company Method and device for policy-based control of radio
US9215710B2 (en) 2006-10-18 2015-12-15 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
US9854461B2 (en) 2007-08-15 2017-12-26 Shared Spectrum Company Methods for detecting and classifying signals transmitted over a radio frequency spectrum
CN114125968A (zh) * 2021-11-19 2022-03-01 深圳市联平半导体有限公司 无线终端的无线接入点的切换方法与装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002058341A2 (fr) * 2001-01-19 2002-07-25 Nokia Corporation Dispositif et procede associe permettant une selection dynamique des niveaux de frequence permettant de definir les canaux de communication dans un systeme de radiocommunication
US20030198200A1 (en) * 2002-04-22 2003-10-23 Cognio, Inc. System and Method for Spectrum Management of a Shared Frequency Band

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002058341A2 (fr) * 2001-01-19 2002-07-25 Nokia Corporation Dispositif et procede associe permettant une selection dynamique des niveaux de frequence permettant de definir les canaux de communication dans un systeme de radiocommunication
US20030198200A1 (en) * 2002-04-22 2003-10-23 Cognio, Inc. System and Method for Spectrum Management of a Shared Frequency Band

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CHIH-YUNG CHANG ET AL: "MCDA: An Efficient Multi-Channel MAC Protocol for 802.11 Wireless LAN with Directional Antenna" ADVANCED INFORMATION NETWORKING AND APPLICATIONS, 2005. AINA 2005. 19TH INTERNATIONAL CONFERENCE ON TAIPEI, TAIWAN 25-30 MARCH 2005, PISCATAWAY, NJ, USA,IEEE, 25 March 2005 (2005-03-25), pages 64-67, XP010789969 ISBN: 0-7695-2249-1 *
JAIN N ET AL: "A multichannel CSMA MAC protocol with receiver-based channel selection for multihop wireless networks" COMPUTER COMMUNICATIONS AND NETWORKS, 2001. PROCEEDINGS. TENTH INTERNATIONAL CONFERENCE ON 15-17 OCT. 2001, PISCATAWAY, NJ, USA,IEEE, 15 October 2001 (2001-10-15), pages 432-439, XP010562128 ISBN: 0-7803-7128-3 *

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE43066E1 (en) 2000-06-13 2012-01-03 Shared Spectrum Company System and method for reuse of communications spectrum for fixed and mobile applications with efficient method to mitigate interference
USRE44492E1 (en) 2000-06-13 2013-09-10 Shared Spectrum Company System and method for reuse of communications spectrum for fixed and mobile applications with efficient method to mitigate interference
USRE47120E1 (en) 2000-06-13 2018-11-06 Shared Spectrum Company System and method for reuse of communications spectrum for fixed and mobile applications with efficient method to mitigate interference
USRE44237E1 (en) 2000-06-13 2013-05-21 Shared Spectrum Company System and method for reuse of communications spectrum for fixed and mobile applications with efficient method to mitigate interference
USRE46905E1 (en) 2000-06-13 2018-06-19 Shared Spectrum Company System and method for reuse of communications spectrum for fixed and mobile applications with efficient method to mitigate interference
US9900782B2 (en) 2006-05-12 2018-02-20 Shared Spectrum Company Method and system for dynamic spectrum access
US9538388B2 (en) 2006-05-12 2017-01-03 Shared Spectrum Company Method and system for dynamic spectrum access
US10070437B2 (en) 2006-10-18 2018-09-04 Shared Spectrum Company Methods for using a detector to monitor and detect channel occupancy
US9215710B2 (en) 2006-10-18 2015-12-15 Shared Spectrum Company Methods for using a detector to monitor and detect channel occupancy
US9491636B2 (en) 2006-10-18 2016-11-08 Shared Spectrum Company Methods for using a detector to monitor and detect channel occupancy
US8997170B2 (en) 2006-12-29 2015-03-31 Shared Spectrum Company Method and device for policy-based control of radio
US10484927B2 (en) 2006-12-29 2019-11-19 Shared Spectrum Company Method and device for policy-based control of radio
EP2001176A3 (fr) * 2007-06-08 2013-01-23 Imec Procédé de configuration d'une communication multicanaux
US9854461B2 (en) 2007-08-15 2017-12-26 Shared Spectrum Company Methods for detecting and classifying signals transmitted over a radio frequency spectrum
WO2009045646A2 (fr) * 2007-08-15 2009-04-09 Shared Spectrum Company Systèmes et procédés pour radio cognitive présentant des caractéristiques adaptables
US10104555B2 (en) 2007-08-15 2018-10-16 Shared Spectrum Company Systems and methods for a cognitive radio having adaptable characteristics
WO2009045646A3 (fr) * 2007-08-15 2009-11-12 Shared Spectrum Company Systèmes et procédés pour radio cognitive présentant des caractéristiques adaptables
CN101889461A (zh) * 2007-12-06 2010-11-17 皇家飞利浦电子股份有限公司 分布式频谱认知无线电网络中的频道管理方法
KR101582525B1 (ko) 2007-12-06 2016-01-06 코닌클리케 필립스 엔.브이. 분산 스펙트럼 인지 라디오 네트워크에서 채널 관리 방법
JP2011507324A (ja) * 2007-12-06 2011-03-03 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 分散スペクトルコグニティブラジオネットワークのチャネル管理方法
KR20100106454A (ko) * 2007-12-06 2010-10-01 코닌클리케 필립스 일렉트로닉스 엔.브이. 분산 스펙트럼 인지 라디오 네트워크에서 채널 관리 방법
WO2009072087A1 (fr) 2007-12-06 2009-06-11 Koninklijke Philips Electronics, N.V. Procédé de gestion de canaux dans un réseau radio cognitif à spectre réparti
CN101911746A (zh) * 2008-02-04 2010-12-08 诺基亚公司 在拥塞的协作系统中操作认知无线电
US8391881B2 (en) 2008-02-04 2013-03-05 Nokia Corporation Method and apparatus to operate a cognitive radio in a crowded collaborative system
WO2009098566A1 (fr) * 2008-02-04 2009-08-13 Nokia Corporation Procédé et dispositif pour faire fonctionner une radio cognitive dans un système collaboratif encombré
GB2470372A (en) * 2009-05-19 2010-11-24 Toshiba Res Europ Ltd Channel access in a cognitive radio network
US8432823B2 (en) 2009-05-19 2013-04-30 Kabushiki Kaisha Toshiba Wireless communications method and apparatus
GB2470372B (en) * 2009-05-19 2011-09-28 Toshiba Res Europ Ltd Wireless communications method and apparatus
CN114125968A (zh) * 2021-11-19 2022-03-01 深圳市联平半导体有限公司 无线终端的无线接入点的切换方法与装置
CN114125968B (zh) * 2021-11-19 2024-03-29 深圳市联平半导体有限公司 无线终端的无线接入点的切换方法与装置

Also Published As

Publication number Publication date
WO2007034461A3 (fr) 2007-07-12

Similar Documents

Publication Publication Date Title
WO2007034461A2 (fr) Systèmes sans fil multivoie comportant des voies de rendez-vous dynamiques
EP2044798B1 (fr) Procédé et système d'émission et de réception de balises
Ghosh et al. Coexistence challenges for heterogeneous cognitive wireless networks in TV white spaces
US8873470B2 (en) Method of recovering communication access in dynamic spectrum access wireless systems
US8233444B2 (en) Spectrum management in dynamic spectrum access wireless systems
US9137805B2 (en) Spectrum management in dynamic spectrum access wireless systems
US9883486B2 (en) Multiple frequency band operation in wireless networks
US9078267B2 (en) Channel selection method for wireless networks
US7983298B2 (en) Multiple frequency band operation in wireless networks
EP3107340B1 (fr) Procédé et appareil de transmission de trame dans un réseau local sans fil
CN102860073B (zh) 多无线网络的共存
EP2571307A1 (fr) Procédé, appareil et programme d'ordinateur pour la gestion d'une période silencieuse pour la coexistence de réseaux sans fil
CN108028735B (zh) 无线网络中的复用消息传送
US20220394613A1 (en) Signal transmission method and device of terminal in wireless mobile communication system
KR20160133447A (ko) 피어-투-피어 트래픽 및/또는 액세스 포인트 트래픽을 멀티플렉싱하기 위한 방법들 및 장치
US20180263038A1 (en) Transmission power in adaptive cca and tpc based reuse
US20100226312A1 (en) Apparatus and method for transmitting coexistence beacon protocol packet in cognitive radio wireless communication system
EP3915310B1 (fr) Sélection de canal inter-réseau coopératif
WO2007083202A1 (fr) Procede de detection et d'evitement (daa) pour la protection de dispositifs de faible puissance
Mark Improving spectrum sensing performance by exploiting multiuser diversity
Xiang et al. Medium access control in cognitive radio networks
KR20240073883A (ko) Wi-fi 인식 절전

Legal Events

Date Code Title Description
NENP Non-entry into the national phase in:

Ref country code: DE

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 06821146

Country of ref document: EP

Kind code of ref document: A2

122 Ep: pct application non-entry in european phase

Ref document number: 06821146

Country of ref document: EP

Kind code of ref document: A2