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WO2018012765A1 - Procédé permettant de changer automatiquement de canal dans un système lan sans fil et appareil correspondant - Google Patents

Procédé permettant de changer automatiquement de canal dans un système lan sans fil et appareil correspondant Download PDF

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Publication number
WO2018012765A1
WO2018012765A1 PCT/KR2017/006878 KR2017006878W WO2018012765A1 WO 2018012765 A1 WO2018012765 A1 WO 2018012765A1 KR 2017006878 W KR2017006878 W KR 2017006878W WO 2018012765 A1 WO2018012765 A1 WO 2018012765A1
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WIPO (PCT)
Prior art keywords
channel
sta
channel change
change
qos
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Ceased
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PCT/KR2017/006878
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English (en)
Korean (ko)
Inventor
신종화
송영금
정양석
허시영
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KT Corp
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KT Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/543—Allocation or scheduling criteria for wireless resources based on quality criteria based on requested quality, e.g. QoS
    • 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
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
    • H04W72/569—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient of the traffic information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to a method and apparatus for automatically changing a channel in a WLAN system. More specifically, the present invention relates to a station due to interference or the like when an access point (AP) automatically changes a channel in a WLAN system. The present invention relates to an automatic channel changing method and apparatus for minimizing service disconnection that may occur in a station (hereinafter, STA).
  • STA station
  • a wireless LAN is a method of communicating over a network using radio waves without using a cable.
  • the emergence of wireless LAN has emerged as an alternative to solve the difficulties of installation, maintenance, and movement due to cabling, and the necessity is increasing due to the increase of mobile users.
  • a channel change is performed through a process as shown in FIG. 1 to maintain service quality.
  • the AP may change the channel to a new channel after determining the channel change, but a case in which the CSA frame transmitted by the AP may not reach the STA and may be lost due to interference or the like may occur. have.
  • the AP moves to a new channel, while an STA that does not receive a CSA frame cannot change a channel to a new channel, and the STA finds an AP for a predetermined time, and if the AP does not exist in the corresponding channel, The channel must be scanned again to find and reassociate the AP.
  • the STA has a problem in that the service disconnection occurs in the STA during the time for determining that the AP disappears, the time for rescanning the AP through the full channel scan, and the time for reconnection to the AP.
  • the present invention is to solve the above problems, even if the AP fails to change the channel even though the AP transmits a channel change notification message to the STA in the WLAN system, the service disconnection for the STA occurs
  • An object of the present invention is to provide an automatic channel changing method and apparatus for minimizing the number of channels.
  • the method may further include generating a list of QoS_STA lists for generating a list of STAs requiring QoS guarantee among the STAs connected to the AP, wherein the determining of channel change comprises: the STA included in the QoS_STA list being selected by the STA. It may be determined whether a channel change is completed with two channels.
  • the generating of the QoS_STA list may include: determining whether the corresponding STA is an STA requiring QoS guarantee based on the type of data packet received from the STA; If the STA is an STA requiring QoS guarantee, the STA may include adding to the QoS_STA list.
  • the generating of the QoS_STA list may further include allocating priorities based on the types of data packets received from the STA requiring the QoS guarantee.
  • the re-notifying of the channel change may include: The QoS_STA may retransmit the channel change notification message more preferentially.
  • the corresponding STA completes the channel change to the second channel in a preset second time range.
  • the channel change determination step and the channel change re-notification step may be repeatedly performed.
  • the method may further include: when the STA satisfies at least one or more of a condition in which the signal quality in the first channel is less than or equal to a first reference value and a signal quality in the second channel is greater than or equal to a second reference value, the STA is assigned to the STA.
  • the method may further include transmitting a control message for transmitting the control message so as not to switch to the low power mode.
  • the channel change determining step may determine whether a data packet is received from an STA on the second channel.
  • the channel change re-notification step may change the channel to the first channel for a time shorter than a beacon frame period, retransmit the channel change notification message to the corresponding STA, and change the channel to the second channel again. have.
  • a channel changer that determines and performs a channel change from the first channel to the second channel; A channel change notification unit for transmitting a channel change notification message to an associated STA (Station) based on the channel change determination; And a channel change determining unit determining whether the STA completes the channel change to the second channel for a preset first time after changing the channel to the second channel, and changing the channel change to the second channel. If the STA fails to complete the channel change to the second channel for a preset first time, the AP changes the channel to the first channel, retransmits the channel change notification message to the corresponding STA, and then the second channel. You can change the channel to 2 channels.
  • the apparatus further includes a QoS_STA list generation unit for generating a list of STAs requiring QoS guarantee among the STAs connected to the AP, wherein the channel change determining unit changes the channel of the STA included in the QoS_STA list into the second channel. It can be determined whether or not to complete.
  • the STA mode control unit may further include a control message for transmitting the control message.
  • FIG. 1 illustrates a procedure of a method performed when a channel change notification message transmitted from a conventional AP does not reach an STA.
  • FIG. 2 shows each configuration of a wireless LAN system according to the present invention.
  • FIG. 3 is a flowchart illustrating an automatic channel change method in a WLAN system according to a first embodiment of the present invention.
  • FIG. 4 illustrates an example of a channel change notification message according to the present invention.
  • FIG. 5 is a flowchart illustrating an automatic channel change method in a WLAN system according to a second embodiment of the present invention.
  • FIG. 6 illustrates a part of an order of an automatic channel changing method in a WLAN system according to a third embodiment of the present invention.
  • FIG. 7 illustrates a part of an order of an automatic channel changing method in a WLAN system according to a fourth embodiment of the present invention.
  • FIG. 8 illustrates a configuration of an automatic channel change AP in a WLAN system according to the present invention.
  • first and second may be used to describe various components, but the components are not limited by the terms, and the terms are used to distinguish one component from another component. Used only as
  • FIG. 2 shows each configuration of a wireless LAN system according to the present invention.
  • the WLAN system may include an AP 100, a STA 200, and a communication network 10 wirelessly connecting the AP 100 and the STA 200. have.
  • the AP 100 is a functional entity that provides data through a wireless medium for an associated station (STA) associated with it. Since the WLAN environment is constantly changing, the AP 100 periodically measures the signal quality in each channel for stable data transmission to the STA 200, and based on the corresponding measurement value, the channel to a channel having a better condition. The change can be determined. In addition, since the AP 100 may provide data only to the STA 200 existing on the same channel, the STA 200 may transmit a channel change notification message to the combined STA 200 after determining a channel change. Also, channel change related information may be provided to enable channel change.
  • STA station
  • the AP 100 may separately store and manage a list of STAs requiring QoS guarantee from among the STAs 200.
  • the AP 100 may transmit a control message for partially controlling the operation of the STA 200.
  • the STA 200 is a functional medium including a medium access control (MAC) conforming to the IEEE 802.11 standard and a physical layer interface to a wireless medium.
  • the concept includes all of the STA. However, in the present invention, it is assumed that the STA 200 is a non-AP STA for convenience of description.
  • the STA 200 receives data from the AP 100 and operates according to the function of each STA 200. As shown in FIG. 2, the STA 200 may include an IPTV, a PC, a laptop, a smart phone, and the like.
  • the communication network 10 mediates data transmission and reception between the AP 100 and the STA 200, and may include a wired network and a wireless network.
  • the communication network 10 is assumed to be a wireless network.
  • the communication network 10 may include a local area network (LAN), a metropolitan area network (MAN), a wide area network (WAN), and the like.
  • LAN local area network
  • MAN metropolitan area network
  • WAN wide area network
  • the communication network 10 according to the present invention is not limited to the networks listed above, but may include a known wireless data network.
  • FIG. 3 is a flowchart illustrating an automatic channel change method in a WLAN system according to a first embodiment of the present invention.
  • the AP 100 determines a channel change and transmits a channel change notification message (S320). Thereafter, the method may include determining whether to change a channel for each STA 210 and 220 (S330), and resending the channel change notification message to the STA 210 that has not completed channel change (S330).
  • S330 determining whether to change a channel for each STA 210 and 220
  • S330 resending the channel change notification message to the STA 210 that has not completed channel change
  • the AP 100 may determine the channel change when a predetermined channel change condition is satisfied while periodically measuring the signal quality of each channel of the WLAN system.
  • the signal quality may include delay, packet loss, jitter, bandwidth, throughput, reliability, availability, and the like.
  • the channel change condition may mean whether data load, interference, signal strength, etc. satisfy a preset condition.
  • the AP 100 Upon determining the channel change, the AP 100 transmits a channel change notification message to the STA 200 that is associated with the current channel (first channel) before performing the actual channel change.
  • the channel change notification message may include identification information about a channel (second channel) to be changed, a channel change time, and the like.
  • CSA channel switch announcement
  • the channel switch notification element may include a channel switch mode, a new channel number, a channel switch count, and the like.
  • step S320 of Figure 3 despite the transmission of the channel change notification message of the AP 100, the channel change notification message is not properly received by some STA 210 due to interference in the WLAN environment. Cases may occur.
  • step S320 after the AP 100 completes the channel change to the second channel, the information included in the channel change notification message by the STA 200 that has been associated with the AP 100. It may be determined whether or not to complete the channel change to the second channel for a predetermined first time by. That is, it is determined whether a data packet is received from the STA 200 during the first time.
  • the first time may be set in consideration of a delay variation or jitter of a packet, a buffer size, and the like, and a time taken for several data packets to reach the AP 100 from the STA 200. It may be set in consideration.
  • the data packet transmission period may be set based on the data packet transmission period of the longest STA.
  • the STA 220 receiving the channel change notification message in the previous step S320 completes the channel change to the second channel based on the channel change notification message received from the AP 100.
  • the AP 100 may perform data transmission / reception (WLAN Data) smoothly.
  • WLAN Data data transmission / reception
  • the STA 210 that has not received the channel change notification message due to interference or the like is present on a different channel from the AP 100, smooth data transmission and reception are impossible.
  • the AP 100 determines that the STA 210 has failed to change the channel based on the absence of a data packet received from the STA 210 during the first time.
  • step S340 the AP 100 changes the channel back to the first channel for the STA 210 that has not completed the channel change to the second channel, retransmits the channel change notification message to the STA 210, and again.
  • the channel may be changed to the second channel.
  • the steps S330 and S340 are performed until the corresponding STA 210 completes the channel change. May be repeated.
  • the AP 100 when the AP 100 performs the step S340 for the STA 210 that fails to change the channel, the AP 100 should not interfere with data transmission and reception with the STA 220 that has completed the channel change, so the step S340 is a beacon. ) Is preferably performed for a time shorter than the period of the frame.
  • a second time is set in advance, and although the steps S330 and S340 are repeatedly performed within the second time range, the STA 210 channels. If the change is not completed, the step S330 and S340 may not be performed any more. At this time, if the time taken to repeatedly perform steps S330 and S340 is longer than the service disconnection time in FIG. 1, the object of the present invention may not be achieved, and thus, the second time is set within the service disconnection time. It is preferable.
  • FIG. 5 illustrates an example of a procedure of an automatic channel changing method in a WLAN system according to a second embodiment of the present invention.
  • the AP 100 in the automatic channel change method in the WLAN system according to the second embodiment of the present invention, the AP 100 generates a QoS_STA list (S510), determines a channel change, and transmits a notification message. And a step S520 of determining whether to change the channel for the QoS_STA 210 after the channel change, and resending the channel change notification message to the QoS_STA 210 that has not completed the channel change (S540). can do.
  • the AP 100 and the STAs 210 and 220 in the WLAN system are transmitting and receiving data (WLAN Data) on the first channel.
  • the AP 100 may generate a list of STAs (hereinafter, referred to as QoS_STAs) for which quality of service (QoS) guarantee is required. More specifically, when the AP 100 and the STAs 210 and 220 are initially associated with each other, the STA is based on the characteristics and types of data packets received from the STAs 210 and 220 to the AP 100. It is determined whether it is QoS_STA, and if the corresponding STA is QoS_STA, the identification information is stored in the QoS_STA list.
  • QoS_STAs quality of service
  • an STA generating traffic such as a Real Time Protocol (RTP) packet, AC_VI, AC_VO, and the like may be determined as QoS_STA.
  • RTP Real Time Protocol
  • the QoS_STA 210 is stored in the QoS_STA list, and the STA 220 is not stored.
  • the STA (QoS_STA) requiring the QoS guarantee may include an STA that should allocate radio communication resources preferentially to another STA, an STA that plays a high capacity multimedia, and the like.
  • the IPTV 210 including the set top box may be classified as QoS_STA.
  • the IPTV 210 requires transmission and reception of high-capacity data such as video and audio, and STA STAs 220a and 220b have different user inconveniences when data transmission and reception are not smooth in relation to the AP 100 due to interference or the like. This is because it is comparable to 220c).
  • step S520 is the same as step S320, detailed description thereof will be omitted. However, it is assumed that the channel change notification message has not reached both the QoS_STA 210 and the STA 220.
  • the AP 100 may not determine whether the channel is changed for all connected STAs 210 and 220, but may determine whether the second channel is changed only for the QoS_STA included in the QoS_STA list. In FIG. 5, both the QoS_STA 210 and the STA 220 have failed to change the channel, but the AP 100 may determine that only the QoS_STA 210 has changed the channel.
  • step S540 the AP 100 changes the channel back to the first channel for the QoS_STA 210 that has not completed the channel change to the second channel and retransmits the channel change notification message to the QoS_STA 210.
  • the channel may be changed back to the second channel.
  • the STA 220 may not retransmit the channel change notification message.
  • steps S530 and S540 may be repeatedly performed for a preset second time, and in particular, step S540 may be performed for a shorter time than a period of a beacon frame.
  • FIG. 6 illustrates a part of an order of an automatic channel changing method in a WLAN system according to a third embodiment of the present invention.
  • the STA 200 is further subdivided to allocate priorities and retransmit the channel change notification message according to the priority. It is about.
  • step S510 when the AP and the STA are connected, the AP receives a data packet from the STA (S511).
  • the STA determines whether the corresponding STA is a QoS_STA based on the characteristics and types of the received data packet, allocates a priority according to preset DB information, and stores the identification information in the QoS_STA list.
  • the priority may be set such that higher priority is assigned to data traffic such as video and audio sensitive to latency or data traffic having a high loss rate.
  • Steps S520 and S530 are the same as those described with reference to FIG. 5, and thus will be omitted.
  • step S540 the AP 100 changes the channel back to the first channel for the QoS_STA 210 that has not completed the channel change to the second channel (S541), and prioritizes each STA stored in the QoS_STA list. Based on the higher priority, the channel change notification message may be retransmitted (S542), and the channel may be changed back to the second channel (S543).
  • FIG. 7 illustrates a part of an order of an automatic channel changing method in a WLAN system according to a fourth embodiment of the present invention.
  • the AP continuously measures the channel environment in the WLAN system, determines a channel change when a specific channel change condition is satisfied, and transmits a channel change notification message to an STA connected to the AP. However, at this time, if the STA receiving the channel change notification message is operating in a low power mode, the probability of not receiving the channel change notification message increases.
  • the AP may transmit a control message to the STA to control the STA from operating in a low power mode.
  • the channel change is performed when the signal quality in the current channel is lower than the third reference value or when the signal quality in a channel other than the current channel is better than the fourth reference value.
  • the AP 100 measures signal quality of all channels on the first channel (S710). Determining whether the signal quality of the current channel (first channel) is deteriorating or the signal quality of another channel (second channel) other than the current channel is improving to such an extent (S720). It may be configured to include a step (S730) for transmitting.
  • the AP measures the signal quality of the current channel that is transmitting and receiving data with the STA and the signal quality of a channel other than the current channel.
  • the signal quality may include delay, packet loss, jitter, bandwidth, throughput, reliability, availability, and the like.
  • Step S720 is a step of determining when the AP has a high probability of determining a channel change, more specifically, determining whether a signal quality of a first channel is equal to or less than a first reference value (S721) and at least one other than the first channel.
  • the method may include determining whether the signal quality of the second channel is greater than or equal to the second reference value (S722).
  • the first reference value may be greater than the third reference value
  • the second reference value may be smaller than the fourth reference value.
  • the method of determining the point of time when the AP has a high probability of determining a channel change is not limited to steps S721 and S722, and may further consider various variables such as a change amount of signal quality in each channel.
  • operation S722 may be performed before operation S721.
  • a control message may be transmitted to the STA connected to the AP to prevent operation in the low power mode. Furthermore, it may be determined whether to transmit the control message by further considering the remaining battery capacity or the power supply state of the STA.
  • FIG. 8 illustrates a configuration of an automatic channel changing apparatus in a wireless LAN system according to the present invention.
  • the automatic channel change AP 100 generates a channel change unit 110, a channel change notification unit 120, a channel change determination unit 130, and a QoS_STA list. It may be configured to include the unit 140 and the STA mode control unit. Additionally, the DB 300 may further include the QoS_STA list, a channel change condition, priority information according to a data packet, and the like.
  • the channel changer 110 may determine and perform a channel change from a current channel to which the AP 100 is transmitting / receiving data to a channel other than the current channel.
  • the channel change may be performed when the signal quality of the current channel and other channels other than the current channel are measured, and the measured signal quality satisfies a preset condition.
  • the channel change notification unit 120 may transmit a channel change notification message to the STA connected to the AP based on the channel change determination.
  • the channel change notification message may include information such as identification information about a channel to be changed, channel change time, and the like.
  • the channel change determination unit 130 may determine whether the STA completes the channel change to the channel to be changed for a preset first time. More specifically, it may be determined whether a channel of the corresponding STA is changed based on a data packet received from the STA during the preset first time.
  • the first time may be set in consideration of a delay variation or jitter of a packet, a buffer size, and the like, and a time taken for several data packets to reach the AP 100 from the STA 200. It may be set in consideration.
  • the data packet transmission period may be set to the data packet transmission period of the longest STA 200.
  • the QoS_STA list generation unit 140 determines whether the corresponding STA is a STA (QoS_STA) requiring QoS guarantee based on the characteristics and types of data packets received from the STA when the AP and the STA are associated. If the corresponding STA is QoS_STA, the identification information is stored in the QoS_STA list. Furthermore, priority may be allocated and stored according to QoS_STA.
  • QoS_STA STA
  • the STA mode controller 150 may control the STA not to operate in the low power mode by transmitting a control message to the STA connected to the AP.
  • the STA operates in the low power mode, it is difficult to properly receive the channel change notification message. Therefore, the STA does not operate in the low power mode before transmitting the channel change notification message by determining a time when the AP has a high probability of determining the channel change. It is not allowed.

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

Abstract

La présente invention concerne un procédé et un appareil permettant de changer automatiquement de canal dans un système LAN sans fil. L'invention concerne un procédé de changement de canal automatique comprenant : une étape de notification de changement de canal permettant de déterminer un changement de canal d'un premier canal vers un second canal et de transmettre un message de notification de changement de canal à une station (STA) associée à un point d'accès (AP) par l'AP ; une étape de détermination d'achèvement de changement de canal permettant, après le changement de canal, de déterminer si la STA a également achevé le changement de canal vers le second canal dans un premier temps prédéfini ; et une étape de re-notification de changement de canal permettant, lorsque la STA n'a pas achevé le changement de canal vers le second canal, de modifier le canal vers le premier canal pour retransmettre le message de notification de changement de canal à la STA pertinente et rechanger le canal vers le second canal. Par conséquent, la présente invention peut réduire au minimum une interruption de service d'une STA, laquelle peut se produire lorsqu'un message indique qu'un changement de canal n'atteint pas normalement la STA pertinente en raison d'une interférence, bien qu'un AP d'un système LAN sans fil ait effectué automatiquement le changement de canal.
PCT/KR2017/006878 2016-07-15 2017-06-29 Procédé permettant de changer automatiquement de canal dans un système lan sans fil et appareil correspondant Ceased WO2018012765A1 (fr)

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US10980025B2 (en) * 2019-01-31 2021-04-13 Charter Communications Operating, Llc Methods and apparatus for frequency transition management in a quasi-licensed wireless system
KR102102835B1 (ko) * 2019-03-26 2020-04-22 시큐어레터 주식회사 Wips 센서

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US20070104137A1 (en) * 2005-11-04 2007-05-10 Hon Hai Precision Industry Co., Ltd. Channel switch method
US20100039973A1 (en) * 2006-12-18 2010-02-18 Koninklijke Philips Electronics N. V. Qos sceduling methods for wlans with heterogenous applications
US20100103850A1 (en) * 2008-10-23 2010-04-29 Motorola, Inc. Method and apparatus for channel selection in a wireless communication system
US20160007247A1 (en) * 2013-03-10 2016-01-07 Lg Electronics Inc. Method for performing channel switch in network converging plurality of communication systems and apparatus for same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030153334A1 (en) * 2001-11-28 2003-08-14 Tomoaki Hokao Channel switching method and mobile communication terminal using the same
US20070104137A1 (en) * 2005-11-04 2007-05-10 Hon Hai Precision Industry Co., Ltd. Channel switch method
US20100039973A1 (en) * 2006-12-18 2010-02-18 Koninklijke Philips Electronics N. V. Qos sceduling methods for wlans with heterogenous applications
US20100103850A1 (en) * 2008-10-23 2010-04-29 Motorola, Inc. Method and apparatus for channel selection in a wireless communication system
US20160007247A1 (en) * 2013-03-10 2016-01-07 Lg Electronics Inc. Method for performing channel switch in network converging plurality of communication systems and apparatus for same

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