WO2017011091A1 - Procédé et agencement pour améliorer des performances de scrutation et d'itinérance d'un client mobile par récupération de paramètres de scrutation et d'itinérance de points d'accès connectés à un système de distribution - Google Patents

Procédé et agencement pour améliorer des performances de scrutation et d'itinérance d'un client mobile par récupération de paramètres de scrutation et d'itinérance de points d'accès connectés à un système de distribution Download PDF

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Publication number
WO2017011091A1
WO2017011091A1 PCT/US2016/035985 US2016035985W WO2017011091A1 WO 2017011091 A1 WO2017011091 A1 WO 2017011091A1 US 2016035985 W US2016035985 W US 2016035985W WO 2017011091 A1 WO2017011091 A1 WO 2017011091A1
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WO
WIPO (PCT)
Prior art keywords
client
aps
parameter
aggregated
over
Prior art date
Application number
PCT/US2016/035985
Other languages
English (en)
Inventor
Yadukishore KODICHERLA
Rajiv Shirirang JOSHI
Raj Kiran
Sandeep Ramakrishnan
Mark LUKSICH
Marco Belli
Rajendiran SUBRAMANI
Original Assignee
Symbol Technologies, Llc
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 Symbol Technologies, Llc filed Critical Symbol Technologies, Llc
Publication of WO2017011091A1 publication Critical patent/WO2017011091A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/14—Access restriction or access information delivery, e.g. discovery data delivery using user query or user detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • 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]

Definitions

  • the present invention relates generally to a distribution system (DS) having a plurality of interconnected access points (APs) and a mobile client that wants to roam between one of the APs (current AP) with which the client is currently exchanging data, to one of the other APs (target AP) to which the client wishes to exchange data after roaming, and, more particularly, to a method of, and an arrangement for, enhancing scan and roam performance of the mobile client by retrieving scan and roam parameters, such as channel information and/or information elements (IEs), from the other APs, especially in delay-sensitive communications applications, such as Internet Protocol (IP) networks over which voice and/or video (VoIP) are carried.
  • IEs channel information and/or information elements
  • LAN wireless local area network
  • DS distribution system
  • APs access points
  • a mobile, wireless communications client e.g., a smartphone, a tablet, a laptop or portable computer, a personal digital assistant, a wearable communications device, a handheld and/or vehicular radio, or an analogous supplicant device, to securely exchange voice and/or video communications data with one of the APs (current AP), after authentication, association, and key derivation, over at least one communications channel, i.e., a designated frequency band in the radio communications spectrum.
  • Certain channels are shared by certain radar systems, such as weather, airport, road, industrial, and military radars. These radar systems generate mission-critical radar signals that are granted a higher transmission priority than wireless LAN communications by governmental regulation.
  • DFS dynamic frequency selection
  • each wireless device i.e., each AP and the client, must be able to sense the presence of a radar signal on a particular channel or channels, and then take action to insure that the client does not use that channel for communications if a radar signal is present.
  • the client must passively scan the channels, one at a time, typically for about 105ms, and listen either for beacons sent periodically by the APs on each channel, or for probe responses sent by the APs on each channel.
  • the client is not permitted to actively scan any DFS channel on which a radar signal is present. Even if there is no radar signal on the DFS channel and the client heard a beacon during the passive scan on that channel, then the client can actively scan on the channel for a maximum period of ten seconds from the point of time that it heard the beacon.
  • the time taken to successively passively scan multiple channels is significant for VoIP applications where a delay on the order of fifty milliseconds is generally considered the highest amount of delay that can be introduced and tolerated in a voice call or video session.
  • the client moves from the current AP, generally referred to as roaming, and wishes to exchange data with another of the APs (target AP) whose transmission signal quality is better than that of the current AP, then the client must be sure that there is no radar signal on the channel of the target AP.
  • this involves passively scanning all the channels, one after another, typically for about 105ms each, as described above, in order to find the candidate APs and select the channel having no radar signal and the best transmission signal quality.
  • the time taken to successively passively scan multiple channels negatively impacts on the roam handoff time and can interrupt the continuity of the voice call or video session.
  • FIG. 1 is a circuit topology of an arrangement by which a mobile client retrieves AP parameters from other APs over a DS in accordance with the present disclosure.
  • FIG. 2 is a connection and time sequence diagram of the arrangement of FIG. 1 in which the retrieved AP parameters are channels in accordance with the present disclosure.
  • FIG. 3 is a connection and time sequence diagram of the arrangement of FIG. 1 in which the retrieved AP parameters are IEs in accordance with the present disclosure.
  • One aspect of the present disclosure generally relates to a distribution system (DS) having a mobile client, e.g., a smartphone, a tablet, a laptop or portable computer, a personal digital assistant, a wearable communications device, a handheld and/or vehicular radio, or an analogous supplicant device, wanting to roam away from a current access point (AP) with which the client is currently exchanging data, and, more particularly, to a method of enhancing scan and roam performance by retrieving scan and roam parameters, e.g., channel information and/or information elements (IEs), from other APs interconnected with the current AP over the DS.
  • scan and roam parameters e.g., channel information and/or information elements (IEs)
  • the method is performed by the client discovering candidate APs that are available for roaming from among the other APs, by the client combining information from the candidate APs to construct an aggregated scan assist (SA) parameter request frame, and by the client sending the aggregated SA parameter request frame to an SA handler over a wireless connection.
  • SA handler is preferably located in the current AP, but may be located in one of the other APs, or a controller of the DS, or the DS, or in the cloud.
  • the SA handler sends an individual SA parameter request message based on the aggregated SA parameter request frame to each candidate AP over the DS, receives an individual SA parameter response message from each candidate AP over the DS, and forwards either individual SA parameter response frames, or an aggregated SA parameter response frame, to the client over the wireless connection.
  • the client also selects a target AP from the candidate APs based on the SA parameter response frame(s), and exchanges data with the target AP after roaming.
  • a plurality of the channels are dynamic frequency selection (DFS) channels designated to carry radar signals of higher priority than the data exchanged by the client.
  • DFS dynamic frequency selection
  • the SA handler forwards individual SA parameter response frames based on the individual SA parameter response messages to the client.
  • the client determines the absence of radar signals on the DFS channels based on the individual SA parameter response frames, sends probe request frames on the DFS channels having no radar signals, receives probe response frames on the DFS channels having no radar signals, roams, and exchanges data with the target AP over one of the DFS channels having no radar signals.
  • the client itself will periodically send the aggregated SA parameter request frame to the SA handler over the wireless connection, and then the SA handler, as before, sends the individual SA parameter request message based on the aggregated SA parameter request frame to each candidate AP over the DS, receives the individual SA parameter response message from each candidate AP over the DS, and forwards the individual SA parameter response frames to the client over the wireless connection in response to each aggregated SA parameter request frame sent by the client.
  • the client sends the aggregated SA parameter request frame to the SA handler over the wireless connection with a request for unsolicited periodic parameter response messages from the other APs, and the SA handler sends the individual SA parameter request message based on the aggregated SA parameter request frame to each candidate AP over the DS, receives the periodic individual SA parameter response message from each candidate AP over the DS, and forwards the periodic individual SA parameter response messages over the wireless connection.
  • the SA handler combines the individual SA parameter response messages to construct an aggregated SA parameter response frame, and sends the aggregated SA parameter response frame to the client.
  • the client uses the retrieved IEs for various purposes, such as selecting the target AP.
  • Still another aspect of the present disclosure relates to an arrangement for enhancing scan and roam performance by retrieving scan and roam parameters in a distribution system (DS) having a plurality of interconnected APs, a mobile client currently exchanging data with one of the APs (current AP) and wanting to roam away from the current AP, and a scan assist (SA) handler.
  • the client is configured to discover candidate APs that are available for roaming from among others of the APs, and to combine information from the candidate APs to construct an aggregated SA parameter request frame.
  • the SA handler is configured to receive the aggregated SA parameter request frame sent by the client over a wireless connection, to send an individual SA parameter request message based on the aggregated SA parameter request frame to each candidate AP over the DS, to receive an individual SA parameter response message from each candidate AP over the DS, and to forward either individual SA parameter response frames, or an aggregated SA parameter response frame, to the client over the wireless connection.
  • the client is further configured to select a target AP from the candidate APs based on the SA parameter response frame(s), and to exchange data with the target AP after roaming.
  • the client need no longer successively and passively scan multiple channels, one after another, to learn which DFS channels are valid for transmission, i.e., not carrying radar signals. Instead, an aggregated SA channel information request frame is constructed and sent to the SA handler that, in turn, sends an individual SA channel information request message to each AP, receives an individual SA channel information response message from each AP, and forwards individual SA channel response frames based on the individual SA channel information response messages to the client.
  • an aggregated SA IE request frame is constructed and sent to the SA handler that, in turn, sends an individual SA IE request message to each AP, receives an individual SA IE response message from each AP, constructs an aggregated SA IE response frame from the received individual SA IE response messages, and sends the aggregated SA IE response frame to the client.
  • the aforementioned time taken to learn which DFS channels are valid for transmission, i.e., not carrying radar signals, is greatly reduced, and the client can now readily perform roaming in a rapid, reliable, efficient, high quality, and consistent manner.
  • an arrangement in accordance with this disclosure includes a wired or wireless, distribution system (DS) having a plurality of interconnected access points (APs), which are separately identified as API, AP2, AP3, ... , APN, where N is any whole number; a mobile, wireless communications client currently exchanging data with one (e.g., API) of the APs, hereinafter sometimes referred to as the current AP; and a real or virtual controller interconnected to all the APs.
  • the client is shown in FIG.
  • the client in FIG. 1 is currently exchanging data with the current AP, and wishes to roam along the illustrated roaming direction to another (e.g., AP3) of the APs, hereinafter sometimes referred to as the target AP, in order to exchange data with the target AP after roaming.
  • AP3 another (e.g., AP3) of the APs, hereinafter sometimes referred to as the target AP, in order to exchange data with the target AP after roaming.
  • Each AP is a wireless router and acts as a bridge to the DS.
  • FIG. 2 A connection and time sequence diagram is depicted in FIG. 2 to explain the operation of the arrangement of FIG. 1.
  • the client, the current AP, and the target AP are arranged along the top of FIG. 2, and the various functions performed by each are set forth as one proceeds down the figure towards the bottom of FIG. 2.
  • the client is currently exchanging data with the current AP, because the client had already sent an authentication request frame to the current AP, then had already received an authentication response frame from the current AP, then had already sent an association request frame to the current AP, and then had already received an association response frame from the current AP.
  • keys in accordance with the IEEE 802. IX standard were derived and exchanged between the client and the current AP, thereby enabling the data to be securely exchanged.
  • the client before the client decides to roam away from the current AP, the following steps are performed.
  • the client discovers candidate APs that are available on DFS channels for roaming from among the other APs. This can be accomplished by having the client request a neighbor list of the other APs that neighbor the current AP in accordance with the IEEE 802.11k standard, or by having the client scan the other APs by passively listening for beacons from the other APs, or for probe responses from the other APs resulting from an active scan.
  • the client combines basic service set identifier (BSSID) information, i.e., the AP address, from the candidate APs to construct an aggregated scan assist (SA) channel information request frame, and sends the aggregated SA channel information request frame to an SA handler over a wireless connection.
  • BSSID basic service set identifier
  • SA aggregated scan assist
  • the SA handler receives the aggregated SA channel information request frame from the client, sends an individual SA channel information request message based on the aggregated SA channel information request frame to each candidate AP over the DS, receives an individual SA channel information response message from each candidate AP over the DS, and forwards an individual SA channel information response frame based on the individual SA channel information response message from each candidate AP to the client over the wireless connection.
  • the SA handler could also be located elsewhere, for example, in any of the other APs, or in a real or virtual controller in the DS, or in the DS itself, or in the cloud.
  • a plurality of the channels are dynamic frequency selection (DFS) channels designated to carry radar signals of higher priority than the data exchanged by the client.
  • DFS dynamic frequency selection
  • API may be exchanging data with the client over channel 52, and AP2 may be on DFS channel 56, and AP3 may be on DFS channel 60.
  • the client determines the validity of DFS channels 56, 60 for transmission which, in turn, confirms the presence or absence of radar signals on the DFS channels 56, 60 based on the received individual SA channel information response frames.
  • the client actively scans those DFS channels by sending probe request frames to the APs on the DFS channels 56, 60, by receiving probe response frames from the APs on the DFS channels 56, 60, and selects which of the APs on the DFS channels 56, 60 is best suited to roam to. This selection can be based on various factors. For example, if the client determines that AP3 on channel 60 has the highest received signal strength indication (RSSI) from the APs on DFS channels 56, 60, then the client will select AP3 as the target AP, and exchange data with the target AP over DFS channel 60.
  • RSSI received signal strength indication
  • the exchange of data with the target AP occurs after a roam and key derivation in the case of a secured network (see FIG. 1). If a radar signal is detected on one of the DFS channels 56, 60, as indicated by the channel information in a received individual SA channel information response frame, then the client will not select the AP on that channel.
  • the aggregated SA channel information request frame to the SA handler may have included a request for unsolicited periodic channel information responses from the other APs.
  • the SA handler forwards the periodic individual SA channel information response frames to the client over the wireless connection in response to the request.
  • An active scan is permitted on a DFS channel carrying no radar signal for a period of T seconds, typically 10 seconds.
  • the individual SA channel information response frames may be sent every "M" seconds, where M ⁇ T.
  • the client may itself send the aggregated SA channel request frame periodically to the SA handler over the wireless connection. In that case, the SA handler forwards the individual SA channel response frames over the wireless connection to the client in response to each aggregated SA channel request frame sent by the client.
  • FIG. 3 depicts a connection and time sequence diagram analogous to that shown in FIG. 2, except the scan and roam parameters to be retrieved is not channel information, but information elements (IEs) of the other APs.
  • the IEs are descriptive information about the APs, and, for example, may include the service set identity (SSID), the supported data rates, one or more physical (PHY) parameter sets, an optional contention-free parameter set, an optional independent basic service set (IBSS) parameter set, and an optional traffic indication map.
  • the client uses BSS information from the candidate APs to construct an aggregated SA IE request frame, and sends the aggregated SA IE request frame, and preferably a single such frame, to the SA handler over a wireless connection.
  • the SA handler receives the aggregated SA IE request frame from the client, sends an individual SA IE request message based on the aggregated SA IE request frame to each candidate AP over the DS, receives an individual SA IE response message from each candidate AP over the DS, constructs an aggregated SA IE response frame from the individual SA IE response messages, and sends the aggregated SA IE response frame, and preferably a single such frame, to the client over the wireless connection.
  • the above steps have all been performed prior to the client deciding to roam.
  • the client selects which of the other candidate APs is best suited to roam to. This selection can be based on various factors. For example, if the client determines that AP3 has the highest received signal strength indication (RSSI) from among all of the candidate APs, then the client will select AP3 as the target AP. As another example, this selection can be based on the aggregated SA IE response frame.
  • RSSI received signal strength indication
  • Each of the aggregated request and response frames described above is formatted in one or more packets with multiple data fields, at least one of the fields being designated as an SA parameter aggregate field containing information about all the candidate APs (AP2, AP3, ... , APN).
  • the information includes, among other things, the address and parameters of each one of the candidate APs (AP2, AP3, ... , APN).
  • a includes ... a
  • or “contains ... a” does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises, has, includes, or contains the element.
  • the terms “a” and “an” are defined as one or more unless explicitly stated otherwise herein.
  • the terms “substantially,” “essentially,” “approximately,” “about,” or any other version thereof, are defined as being close to as understood by one of ordinary skill in the art, and in one non-limiting embodiment the term is defined to be within 10%, in another embodiment within 5%, in another embodiment within 1%, and in another embodiment within 0.5%.
  • the term “coupled” as used herein is defined as connected, although not necessarily directly and not necessarily mechanically.
  • a device or structure that is “configured” in a certain way is configured in at least that way, but may also be configured in ways that are not listed.
  • processors such as microprocessors, digital signal processors, customized processors, and field programmable gate arrays (FPGAs), and unique stored program instructions (including both software and firmware) that control the one or more processors to implement, in conjunction with certain non-processor circuits, some, most, or all of the functions of the method and/or apparatus described herein.
  • processors or “processing devices”
  • FPGAs field programmable gate arrays
  • unique stored program instructions including both software and firmware
  • an embodiment can be implemented as a computer-readable storage medium having computer readable code stored thereon for programming a computer (e.g., comprising a processor) to perform a method as described and claimed herein.
  • Examples of such computer-readable storage mediums include, but are not limited to, a hard disk, a CD-ROM, an optical storage device, a magnetic storage device, a ROM (Read Only Memory), a PROM (Programmable Read Only Memory), an EPROM (Erasable Programmable Read Only Memory), an EEPROM (Electrically Erasable Programmable Read Only Memory) and a Flash memory.

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

Abstract

Un client mobile échangeant des données avec un point d'accès (AP) courant récupère des paramètres de scrutation et d'itinérance d'autres AP par une découverte d'AP candidats qui sont disponibles aux fins d'itinérance, combine des informations des AP candidats pour construire une trame de demande de paramètre de scrutation assistée (SA) agrégée, et envoie la trame de demande de paramètre SA agrégée à un gestionnaire de SA. Le gestionnaire de SA envoie à chaque AP candidat un message de demande de paramètre SA individuel sur la base de la trame de demande de paramètre SA agrégée, reçoit de chaque AP candidat un message de réponse de paramètre SA individuel, et transmet au client une trame de réponse de paramètre SA soit agrégée, soit individuelle. Le client sélectionne un AP cible parmi les AP candidats sur la base de la trame de réponse de paramètre et échange des données avec l'AP cible après l'itinérance.
PCT/US2016/035985 2015-07-10 2016-06-06 Procédé et agencement pour améliorer des performances de scrutation et d'itinérance d'un client mobile par récupération de paramètres de scrutation et d'itinérance de points d'accès connectés à un système de distribution WO2017011091A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN2097/DEL/2015 2015-07-10
IN2097DE2015 2015-07-10

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070064660A1 (en) * 2005-09-16 2007-03-22 Qi Emily H Techniques for enhanced transition from access point to access point by a mobile wireless device
US20090252127A1 (en) * 2008-04-02 2009-10-08 Hari Narayanan Rangarajan Building wireless routing structures using out of band signaling
WO2010139058A1 (fr) * 2009-06-04 2010-12-09 Research In Motion Limited Procédés et appareils destinés à être utilisés pour faciliter la communication d'informations de réseau voisin à un terminal mobile à l'aide d'un protocole compatible radius
US20140112327A1 (en) * 2012-10-19 2014-04-24 Futurewei Technologies, Inc. System and Method for Efficient Communications System Scanning
WO2014106434A1 (fr) * 2013-01-03 2014-07-10 Huawei Technologies Co., Ltd. Système et procédé de découverte efficace de protocole de demande de réseau d'accès (anqp) de multiples points d'accès (ap)

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070064660A1 (en) * 2005-09-16 2007-03-22 Qi Emily H Techniques for enhanced transition from access point to access point by a mobile wireless device
US20090252127A1 (en) * 2008-04-02 2009-10-08 Hari Narayanan Rangarajan Building wireless routing structures using out of band signaling
WO2010139058A1 (fr) * 2009-06-04 2010-12-09 Research In Motion Limited Procédés et appareils destinés à être utilisés pour faciliter la communication d'informations de réseau voisin à un terminal mobile à l'aide d'un protocole compatible radius
US20140112327A1 (en) * 2012-10-19 2014-04-24 Futurewei Technologies, Inc. System and Method for Efficient Communications System Scanning
WO2014106434A1 (fr) * 2013-01-03 2014-07-10 Huawei Technologies Co., Ltd. Système et procédé de découverte efficace de protocole de demande de réseau d'accès (anqp) de multiples points d'accès (ap)

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