[go: up one dir, main page]

WO2025214611A1 - Dispositifs et procédés de transition de bss fiable dans un réseau sans fil - Google Patents

Dispositifs et procédés de transition de bss fiable dans un réseau sans fil

Info

Publication number
WO2025214611A1
WO2025214611A1 PCT/EP2024/060009 EP2024060009W WO2025214611A1 WO 2025214611 A1 WO2025214611 A1 WO 2025214611A1 EP 2024060009 W EP2024060009 W EP 2024060009W WO 2025214611 A1 WO2025214611 A1 WO 2025214611A1
Authority
WO
WIPO (PCT)
Prior art keywords
channel
enhanced
upr
stations
frame
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/EP2024/060009
Other languages
English (en)
Inventor
Oren Hencinski
Yotam KATZMAN
Michael Montemurro
Stephen Mccann
Arik Klein
Ohad Klausner
Shahar PATURY
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
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 Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to PCT/EP2024/060009 priority Critical patent/WO2025214611A1/fr
Publication of WO2025214611A1 publication Critical patent/WO2025214611A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • 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
    • 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
    • H04W88/10—Access point devices adapted for operation in multiple networks, e.g. multi-mode access points

Definitions

  • the present disclosure relates to wireless communications. More specifically, the present disclosure relates to devices, in particular access points (APs) and non-AP stations, and methods for reliable BSS transition in a wireless communication network, in particular a WLAN or Wi-Fi network.
  • APs access points
  • non-AP stations non-AP stations
  • reliable BSS transition in a wireless communication network in particular a WLAN or Wi-Fi network.
  • a handover (referred to as BSS transition) or roaming process is not well defined in wireless networks based on the IEEE 802.11 framework of standards.
  • the non-AP station usually selects the AP to associate with.
  • the non-AP station When the non-AP station is entering the coverage area of new WLAN, it first scans at least part of the available spectrum (e.g. the 2.4 GHz, 5 GHz, 6 GHz frequency bands) in order to select the best AP to associate with.
  • the non-AP station may move back to a Scan state to discover candidate APs operating in the same channel.
  • the non-AP station After scanning the spectrum, the non-AP station selects and (re)associates to one of the candidate APs.
  • discovery of networks and candidate APs impacts battery life.
  • the scan operations are restricted (due to the operation width of each band) to reduce power consumption of the non-AP STAs during scanning.
  • a non-AP station may use an active Scan mode or a passive Scan mode.
  • the passive Scan mode the non-AP station listens on the scanned channel and discovers an AP through the reception of Beacon frames.
  • This passive Scan mode requires a higher dwell time, i.e. the time spent by the non-AP station on a channel listening to receive a Beacon or Probe Response frame, per channel (typically in the order of 100ms per channel), but on the other hand does not interfere with the AP activity.
  • the non-AP station sends a Probe Request frame (typically with the RA set to the broadcast address) to discover APs that respond with a Probe Response frame.
  • the active Scan mode is more efficient than the passive Scan mode, because the dwell time is significantly reduced (typically in the order of 15-20ms per channel).
  • OOB Out Of Band
  • Probe Request Storm In a deployment with a large number of stations or a densely deployed wireless network with coverage discontinuities, many stations actively scanning concurrently can lead to an excessive number of Probe Request and Probe Response frames on the channel, thereby substantially congesting the medium. This is referred to as a Probe Request Storm and leads to high inefficiency of the AP services. This congestion of the medium also can result in frame transmission errors causing scanning non-AP stations to initiate roaming procedures, so that Probe Request storms can also result in an unstable network becoming even more unstable.
  • APs access points
  • non-AP stations non-AP stations
  • an access point for communication with one or more non-AP stations associated with the AP via a first Wi-Fi, i.e. WLAN operating channel in a Wi-Fi network.
  • a first Wi-Fi i.e. WLAN operating channel in a Wi-Fi network.
  • WLAN and Wi-Fi are used interchangeably and refer to a wireless local area network in accordance with the IEEE 802.11 framework of standards.
  • the AP is configured to transmit one or more Enhanced Unsolicited Probe Response, Enhanced UPR, frames to one or more further non-AP stations associated with a further AP via a second Wi-Fi operating channel, wherein the further AP communicates with the one or more further non-AP stations associated with the further AP via the second Wi-Fi operating channel.
  • Each Enhanced UPR frame comprises an indication, for instance, a channel number of the first Wi-Fi operating channel.
  • the AP after transmitting the one or more Enhanced UPR frames to the one or more further non-AP stations associated with the further AP via the second Wi-Fi operating channel, the AP is configured to switch back to the first Wi-Fi operating channel for communicating with the one or more non-AP stations associated with the AP via the first Wi-Fi operating channel.
  • each Enhanced UPR frame is an Enhanced UPR broadcast frame and is transmitted in a broadcast manner.
  • the AP is an AP multilink device, MLD, configured to communicate via a plurality of channels/links simultaneously, wherein the AP MLD is configured to advertise an affiliated AP link disablement using a HD-To-Link mapping (TTLM) element in the Beacon and Probe Response frames transmitted by any of its affiliated APs on the first WLAN operating channel, before switching to the second WLAN operating channel and transmitting the one or more Enhanced UPR frames to the one or more further non-AP stations associated with the further AP or one or more non-AP STAs affiliated with non-AP MLDs that are associated with the further AP MLDs via the second WLAN operating channel.
  • TTLM HD-To-Link mapping
  • the AP is not a multilink device, and is configured to initiate a Quiet Channel Element by transmitting a Quiet Channel Element in a Beacon frame on the first WLAN operating channel, before switching to the second WLAN operating channel and transmitting the one or more Enhanced UPR frames to the one or more further non-AP stations associated with the further AP via the second WLAN operating channel.
  • the AP is configured to transmit an AP Announcement Policy indication to one or more further neighbouring APs, wherein the AP Announcement Policy defines a policy for transmitting Enhanced UPR frames on the first Wi-Fi operating channel of the AP or on any of the channels used by the APs affiliated with the AP MLD.
  • the AP Announcement Policy indication comprises one or more of the following: a disallow flag for indicating whether transmitting Enhanced UPR frames is allowed on the first Wi-Fi operating channel of the AP or on any of the channels used by the APs affiliated with the AP MLD; a minimum time interval between the transmission of two successive Enhanced UPR frames on a specific channel; and a validity time of a current set of transmission parameters.
  • the AP is configured to transmit the AP Announcement Policy indication as part of each Enhanced UPR frame and/or as part of a regularly transmitted beacon frame.
  • the indication of the first WLAN operating channel contained in the Enhanced UPR frame comprises a channel number of the first WLAN operating channel.
  • the Enhanced UPR frame further comprises an indication of an AP operating class of the AP and/or an indication of a difference between the transmission power of the AP in the first WLAN operating channel and the transmission power of the AP in the second WLAN operating channel.
  • the AP in response to a request from the one or more non-AP stations associated with the AP, the AP is configured to send a request to the further AP for soliciting the further AP to transmit an Enhanced UPR frame via the first WLAN operating channel to the one or more non-AP stations associated with the AP.
  • a method for operating an access point, AP, for communication with one or more non-AP stations associated with the AP via a first WLAN operating channel in a WLAN.
  • the method comprises: transmitting one or more Enhanced Unsolicited Probe Response, Enhanced UPR, frames to one or more further non- AP stations associated with a further AP, via a second WLAN operating channel, wherein the further AP communicates with the one or more further non-AP stations associated with the further AP, via the second WLAN operating channel, and wherein each Enhanced UPR frame comprises an indication, for instance, of a channel number of the first WLAN operating channel.
  • the method according to the second aspect can be performed by the AP according to the first aspect.
  • further features of the method according to the second aspect result directly from the functionality of the AP according to the first aspect, as well as its different implementation forms described above and below.
  • a non-access point, non-AP, station wherein the non-AP station is associated with an AP via a first WLAN operating channel in a WLAN.
  • the non-AP station is configured to receive from a further AP one or more Enhanced Unsolicited Probe Response, Enhanced UPR, frames via the first WLAN operating channel, wherein the further AP communicates with one or more further non-AP stations associated with the further AP, via a second WLAN operating channel, and wherein each Enhanced UPR frame comprises an indication, for instance, of a channel number of the second WLAN operating channel.
  • the non-AP station is configured to perform a Basic Service Set, BSS, transition, i.e. to re-associate with the further AP based on the indication of the second WLAN operating channel and other parameters of the BSS operating on the second WLAN channel, such as BSSID, SSID and the like.
  • BSS Basic Service Set
  • transition i.e. to re-associate with the further AP based on the indication of the second WLAN operating channel and other parameters of the BSS operating on the second WLAN channel, such as BSSID, SSID and the like.
  • the non-AP station is configured to obtain, e.g. determine a signal strength measure, in particular a Received Signal Strength Indication, RSSI, of each Enhanced UPR frame at the non-AP station and to perform the BSS transition, i.e. to re-associate with the further AP based on the indication of the second WLAN operating channel, if the signal strength measure, in particular the RSSI, indicates that the signal strength of the Enhanced UPR frame is above a pre-defined threshold value.
  • a signal strength measure in particular a Received Signal Strength Indication, RSSI
  • each Enhanced UPR frame is an Enhanced UPR broadcast frame that is transmitted in a broadcast manner.
  • the indication of the second Wi-Fi operating channel contained in the Enhanced UPR frame comprises a channel number of the second WLAN operating channel.
  • the Enhanced UPR frame further comprises an indication of an AP operating class of the further AP and/or an indication of a difference between the transmission power of the further AP in the first Wi-Fi operating channel and the transmission power of the further AP in the second WLAN operating channel.
  • the non-AP station is configured to send a request to the AP for soliciting, i.e. triggering the AP to send a request to the further AP for soliciting, i.e. triggering the further AP to transmit an Enhanced UPR frame via the second WLAN operating channel to the non-AP station associated with the AP.
  • a method for operating a non-access point, non-AP, station for communication with an AP via a first WLAN operating channel in a WLAN.
  • the method according to the fourth aspect comprises receiving from a further AP one or more Enhanced Unsolicited Probe Response, UPR, frames via a first WLAN operating channel, wherein the further AP communicates with one or more further non-AP stations associated with the further AP, via a second WLAN operating channel, and wherein each Enhanced UPR frame comprises an indication, for instance, of a channel number of the second WLAN operating channel.
  • UPR Enhanced Unsolicited Probe Response
  • the method according to the fourth aspect can be performed by the non-AP station according to the third aspect.
  • further features of the method according to the fourth aspect result directly from the functionality of the non-AP station according to the third aspect, as well as its different implementation forms described above and below.
  • a computer program product comprising program code which causes a computer or a processor to perform the method according to the second aspect or the method according to the fourth aspect, when the program code is executed by the computer or the processor.
  • Fig. 1 shows a schematic diagram illustrating a wireless communication network, in particular a WLAN network including an AP according to an embodiment operating on one channel with a plurality of associated non-AP stations and a further AP operating on another channel with a further plurality of associated non-AP stations;
  • Fig. 2a shows a signal exchange between a first and a second AP according to an embodiment implemented as an AP with a plurality of non-AP stations associated with a further AP for a BSS transition;
  • Fig. 2b shows a signal exchange between a first and a second AP according to an embodiment implemented as an AP MLD with a plurality of non-AP stations associated with a further AP for a BSS transition;
  • Fig. 3 illustrates the structure of an Enhanced UPR frame as transmitted by an AP according to an embodiment
  • Fig. 4 shows a signal exchange between an AP according to an embodiment and a further AP for exchanging an AP Announcement Policy
  • Fig. 5 shows a signal exchange between an AP according to an embodiment and a further AP for exchanging an AP Announcement Policy as part of an Enhanced UPR frame;
  • Fig. 6 shows a flow diagram illustrating steps of a method according to an embodiment for operating an AP: and Fig. 7 shows a flow diagram illustrating steps of a method according to an embodiment for operating a non-AP station.
  • a disclosure in connection with a described method may also hold true for a corresponding device or system configured to perform the method and vice versa.
  • a corresponding device may include one or a plurality of units, e.g. functional units, to perform the described one or plurality of method steps (e.g. one unit performing the one or plurality of steps, or a plurality of units each performing one or more of the plurality of steps), even if such one or more units are not explicitly described or illustrated in the figures.
  • a specific apparatus is described based on one or a plurality of units, e.g.
  • a corresponding method may include one step to perform the functionality of the one or plurality of units (e.g. one step performing the functionality of the one or plurality of units, or a plurality of steps each performing the functionality of one or more of the plurality of units), even if such one or plurality of steps are not explicitly described or illustrated in the figures. Further, it is understood that the features of the various exemplary embodiments and/or aspects described herein may be combined with each other, unless specifically noted otherwise.
  • FIG. 1 shows a wireless communication system 100, in particular a wireless communication network in accordance with the IEEE 802.11 framework of standards (also referred to as a Wi-Fi network 100).
  • the Wi-Fi network 100 comprises an access point, AP, 110 in communication with a plurality of non-AP stations HOa-c associated with the AP 110 via a first WLAN channel 118.
  • the Wi-Fi network 100 further comprises at least one further AP 120 in communication with a further plurality of non-AP stations 120a-c associated with the further AP 120 via a second WLAN channel 128.
  • the at least one further AP 120 is operating on a different W-Fi channel than the AP 110.
  • the non-AP stations HOa-c and the further non-AP stations 120a-c may comprise smartphones, laptop computers, tablet computers, desktop computers or other types of wireless devices.
  • the AP 110 may comprise a processing circuitry 111 and a communication interface 113, in particular a wireless communication interface 113 enabling communication in accordance with the IEEE 802.11 framework of standards.
  • the processing circuitry 111 may be implemented in hardware and/or software and may comprise digital circuitry, or both analog and digital circuitry.
  • Digital circuitry may comprise components such as application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), digital signal processors (DSPs), or general-purpose processors.
  • the AP 110 may further comprise a memory 115 configured to store executable program code which, when executed by the processing circuitry 111, causes the AP 110 to perform the functions and methods described herein.
  • the further AP 120 may comprise a processing circuitry 121 and a communication interface 123, in particular a wireless communication interface 123 enabling communication in accordance with the IEEE 802.11 framework of standards.
  • the processing circuitry 121 may be implemented in hardware and/or software and may comprise digital circuitry, or both analog and digital circuitry.
  • Digital circuitry may comprise components such as application-specific integrated circuits (ASICs), field- programmable gate arrays (FPGAs), digital signal processors (DSPs), or general-purpose processors.
  • the AP 120 may further comprise a memory 125 configured to store executable program code which, when executed by the processing circuitry 121, causes the further AP 120 to perform the functions and methods described herein.
  • each of the non-AP stations 1 lOa-c, 120a-c may comprise a processing circuitry and a communication interface (not illustrated in figure 1 ), in particular a wireless communication interface enabling a communication in accordance with the IEEE 802.11 framework of standards.
  • the processing circuitry may be implemented in hardware and/or software and may comprise digital circuitry, or both analog and digital circuitry.
  • Digital circuitry may comprise components such as application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), digital signal processors (DSPs), or general-purpose processors.
  • Each non-AP station HOa-c, 120a-c may further comprise a memory (not illustrated in figure 1 ) configured to store executable program code which, when executed by the processing circuitry of the non-AP station, causes the non-AP station to perform the functions and methods described herein.
  • STA Station (may be an AP STA or a non-AP STA)
  • the AP 110 is configured to transmit via its communication interface 113 one or more Enhanced Unsolicited Probe Response, Enhanced UPR, frames (herein also referred to as UPR+ frames) 140a-n to the further non-AP stations 120a-c associated with a further AP 120 via the second WLAN channel 128, i.e. the WLAN channel 128 being used by the further AP 120 for communicating with its associated non-AP stations 120a-c.
  • each Enhanced UPR frame 140a- n comprises an indication 142, for instance, a channel number of the first WLAN channel 118 used by the AP 110 for communicating with its associated non-AP stations HOa-c.
  • the AP 110 may assist the non-AP stations 120a-c associated with the AP 120 in selecting a candidate AP without the need for a conventional scanning procedure.
  • the AP 110 may be configured to periodically pause its operating WLAN channel 118, switch to the operating WLAN channel 128 of the neighbouring AP 120, send the one or more Enhanced UPR frames 140a-n, and then switch back to its original operating WLAN channel 118.
  • each Enhanced UPR frame 140a-n may include additional information about the operating channel 118 of the AP 110 as well as other parameters of the BSS, such as a BSSID, a SSID, and the like.
  • the non- AP stations 120a-c may establish and maintain a Neighbour AP candidate list without leaving the operating channel 128 with the currently associated AP 120 for selecting the most suitable AP candidate for a BSS transition.
  • each Enhanced UPR frame 140a-n will be transmitted in a broadcast manner so that all non-AP stations 120a-c (might be from different APs on the same channel) that successfully receive the Enhanced UPR frames 140a-n may update their candidate APs list, thus significantly reducing the need for off-channel scanning for the non-AP stations.
  • the non-AP stations, 120a-c may be configured to obtain a signal strength measure, such as a Received Signal Strength Indication, RSSI, of each Enhanced UPR frame 140a-n and to perform the BSS transition to a candidate AP based on the indication of the AP’s operating channel, if the signal strength measure indicates that the signal strength of the Enhanced UPR frame 140a-n is above a pre-defined threshold value.
  • a signal strength measure such as a Received Signal Strength Indication, RSSI
  • Figure 2a shows a signal exchange between the AP 110 (referred to as API 1 in figure 2a) and a further AP 130 (referred to as AP7 in figure 2a) according to an embodiment with the plurality of non-AP stations 120a-c associated with the further AP 120 (referred to as AP6 in figure 2a).
  • the operating channel of AP 110 is channel 36
  • the operating channel of AP 130 is channel 64
  • the operating channel of the AP 120 and its associated non-AP stations 120a-c is channel 52.
  • the AP 110 is configured to initiate a Quiet Channel Element on its operating channel (see 118 in figure 1 ) by means of a Quiet Channel Element that is added to a Beacon frame 201 , before switching to the operating channel of the AP 120 (see stage 203 in figure 2a), transmitting the one or more Enhanced UPR frames 140a-n to the non-AP stations 120a- c associated with the AP 120 via the operating channel, and switching back to the operating channel (see stage 207 in Figure 2a). Based on the one or more Enhanced UPR frames 140a-n each non-AP station 120a-c currently associated with the AP 120 may update their candidate APs list (see stage 205 in figure 2a), as already described above.
  • the same process may be performed by the further AP 130 so that the further AP 130 may be added to the candidate APs list of each non-AP station 120a-c (see stage 215 in figure 2a) currently associated with the AP 120.
  • the further AP 130 may be added to the candidate APs list of each non-AP station 120a-c (see stage 215 in figure 2a) currently associated with the AP 120.
  • the AP 110 may select the AP 110 to perform the BSS transition to (see 223 of figure 2a) and send a Reassociation Request frame to the selected AP 110 (see 225 of figure 2a).
  • FIG. 2b shows a variant of figure 2a, where the AP 110 and the further AP 130 are implemented as a respective AP Multi Link Device, MLD, 110, 130.
  • MLD AP Multi Link Device
  • each AP MLD110, 130 is configured to advertise an affiliated AP link disablement on its operating channel, before transmitting the one or more Enhanced UPR frames 140a-n to the one or more further non-AP stations 120a-c associated with the further AP 120 via the second operating channel (see 128 in figure 1). More specifically, each AP MLD110, 130 is configured to send an advertised TTLM in the Beacon and Probe Response frames 201, 211 prior to leaving its operating channel.
  • the AP MLD 110, 130 After the AP MLD 110, 130 has send the one or more Enhanced UPR frames 140a-n and returned to its operating channel, the AP MLD 110, 130 sends an advertised TTLM in the Beacon and Probe Response frames 209, 219 to its associated non-AP stations.
  • the AP MLDs 110, 130 have the inherent advantage that while sending the one or more Enhanced UPR frames 140a-n on the operating channel of the AP 120, the AP MLDs 110, 130 may still serve their own associated BSS non-AP stations via one of its other links.
  • non-AP stations 1 lOa-c, 120a-c that are not actively communicating with their associated AP 110, 120 may be in power-save mode on the operating channel used for transmitting the one or more Enhanced UPR frames 140a-n.
  • the AP MLD 110, 130 is configured to use the beacon frame timing for the AP operating on the channel used for the one or more Enhanced UPR frames 140a-n in that AP MLD 110, 130 may align the time to move to that operating channel with Beacons and transmit the one or more Enhanced UPR frames 140a-n either just before or just after the Beacon frame and broadcast traffic.
  • FIG. 3 illustrates the structure of an Enhanced UPR frame 140a as transmitted by the AP 110 according to an embodiment.
  • the conventional Unsolicited Probe Response (UPR) frame has been introduced in 802.1 lax as a means for in In-band discovery in the 6GHz band.
  • a conventional UPR frame contains the same information as a beacon frame and is sent by an AP on its own operating channel.
  • the Enhanced UPR frame or UPR+ frame 140a illustrated in figure 3 comprises the same information elements and fields as a conventional UPR frame.
  • the Enhanced UPR frame or UPR+ frame 140a illustrated in figure 3 comprises the indication 142 of the operating channel of the AP 110 sending the Enhanced UPR frame 140a.
  • the Enhanced UPR frame or UPR+ frame 140a comprises in addition to the fields of a conventional UPR frame the following fields: an AP operating class field (1 Byte), wherein the AP operating class field contains an enumerated value from 802.11 Annex E, specifying the operating class in which the channel is valid; a channel number field (1 Byte); and a field (1 Byte) containing an AP Tx power delta between the original channel and the current UPR+ channel, which allows the receiving non-AP stations to make a more informed decision when selecting a new AP to associate with.
  • these fields may be part of the AP channel info field 142, which, in turn, may be part of the CF parameter set field 141 of the Enhanced UPR frame 140a.
  • Figure 4 shows a signal exchange between the AP 110 according to an embodiment and the further AP 120 for exchanging an AP Announcement Policy.
  • the AP 110 may better control the activity of other APs, such as the AP 120, on its own operating channel so that, for instance, the AP 110 may proactively prevent being flooded with Enhanced UPR frames 140a-n from neighbouring APs, such as the AP 120.
  • the operating channel of AP 110 is channel 52
  • the operating channel ofthe AP 120 is channel 64.
  • Figure 5 shows a variant of the embodiment of figure 4, where the AP Announcement Policy is exchanged as part of an Enhanced UPR frame 140a-n.
  • the AP Announcement Policy is defined by a Neighbour AP Announcement Policy (NAAP) field that may include the following sub-fields (as indicated by 401 , 411 and 421 in figure 4 and 501 and 521 in figure 5): a disallow flag indicating whether Enhanced UPR frames 140a-n are allowed or not on this operating channel; a minimal interval between announcements; and/or a validity time of current parameters.
  • NAAP Neighbour AP Announcement Policy
  • the AP 110 is configured to advertise the AP Announcement Policy defined by the NAAP field as part of its beacon frames.
  • any neighbouring AP such as the AP 120, starts sending Enhanced UPR frames 140a-n on the channel of the AP 110, it is configured to first listen to the beacon frames of the AP 110 (indicated by 403, 405, 413 and 415 ), so that it can follow the AP Announcement Policy of the AP 110. In case there are more than one AP on the channel, neighbouring APs may be configured to follow the stricter policy. Another alternative would be to align the Enhanced UPR frames 140a-n at, say N (e.g. 10) TUs after a Beacon and PS group-addressed traffic delivery.
  • N e.g. 10
  • figure 5 shows a variant of the embodiment of figure 4, where the AP Announcement Policy defined by the NAAP field is exchanged as part of an Enhanced UPR frame 140a-n.
  • the AP 110 includes the AP Announcement Policy in the Enhanced UPR frames (indicated by 511 and 531 ) it transmits on the operating channel of the AP 120.
  • the neighbouring APs that receive the Enhanced UPR frame, e.g. the AP 120 do not have to wait and “catch” the other AP’s Beacon before starting to transmit Enhanced UPR frames 140a-n.
  • the flow of Enhanced UPR frames 140a-n described for the embodiments above is highly efficient, it still consumes time and temporarily degrades the AP performance.
  • neighbouring APs may be configured to cooperate in the following way.
  • the AP 120 receives an indication that one (or more) of its associated non-AP stations 120a-c requires UPR+ information from neighbouring APs, such as the AP 110
  • the AP 120 may be configured to indicate to the neighbouring AP 110 that their Enhanced UPR frames 140a-n are required on the operating channel 128 of the AP 120.
  • this embodiment allows cooperation between the APs 110, 120 that minimizes the performance degradation due to the UPR+ flow.
  • a non-AP station 120a-c may inform its associated AP 120 that it would like to start and gathering the UPR+ information from neighbouring APs, such as the AP 110, by sending a UPR+ request frame to the AP 120.
  • the non-AP station 120a-c may request the UPR+ information for a specific operating band or for all operating bands.
  • the AP 120 may either approve or reject the request based upon its own performance requirements or policy.
  • the non-AP station 120a-c may be configured to perform a conventional active or passive scan. As will be appreciated, this embodiment allows the AP 120 to allow the existence of UPR+ in its own channel only when required by its own non-AP stations 120a-c.
  • FIG. 6 shows a flow diagram illustrating steps of a method 600 according to an embodiment for operating the AP 110 for communication with the one or more non-AP stations 11 Oa-c associated with the AP 110 via the first channel 118 in the WLAN 100.
  • the method 600 comprises a step 601 of transmitting the one or more Enhanced Unsolicited Probe Response, Enhanced UPR, frames 140a-n to the one or more further non-AP stations 120a-c associated with the further AP 120 via the second channel 128, wherein the further AP 120 communicates with the one or more further non-AP stations 120a-c associated with the further AP 120 via the second channel 128 and wherein, as already described in great detail above, each Enhanced UPR frame 140a-n comprises an indication 142, for instance, a channel number of the first channel 118.
  • FIG. 7 shows a flow diagram illustrating steps of a method 700 according to an embodiment for operating each of the non- AP stations 1 lOa-c for communication with the AP 110 via the first channel 118 in the WLAN 100.
  • the method 700 comprises a step 601 of receiving from the further AP 120 the one or more Enhanced Unsolicited Probe Response, UPR, frames 140a-n via the first channel 118, wherein the further AP 120 communicates with the one or more further non-AP stations 120a-c associated with the further AP 120 via the second channel 128 and wherein, as already described in great detail above, each Enhanced UPR frame 140a-n comprises an indication 142, for instance, a channel number of the second channel 128.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the described embodiment of an apparatus is merely exemplary.
  • the unit division is merely logical function division and may be another division in an actual implementation.
  • a plurality of units or components may be combined or integrated into another system, or some features may be ignored or not performed.
  • the displayed or discussed mutual couplings or direct couplings or communication connections may be implemented by using some interfaces.
  • the indirect couplings or communication connections between the apparatuses or units may be implemented in electronic, mechanical, or other forms.
  • the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • functional units in the embodiments of the disclosure may be integrated into one processing unit, or each of the units may exist alone physically, or two or more units are integrated into one unit.

Landscapes

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

Abstract

Un point d'accès, AP, (110) est divulgué ici pour une communication avec une ou plusieurs stations non AP (110a-c) associées à l'AP (110) par l'intermédiaire d'un premier canal (118) dans un réseau Wi-Fi (100). L'AP (110) est configuré pour transmettre une ou plusieurs trames de réponse de sonde non sollicitée améliorée, UPR améliorée (140a-n) à une ou plusieurs autres stations non-AP (120a-c) associées à un autre AP (120) par l'intermédiaire d'un second canal (128), l'autre AP (120) communiquant avec la ou les autres stations non-AP (120a-c) associées à l'autre AP (120) par l'intermédiaire du second canal (128) et chaque trame d'UPR améliorée (140a-n) comprenant une indication du premier canal (118).
PCT/EP2024/060009 2024-04-12 2024-04-12 Dispositifs et procédés de transition de bss fiable dans un réseau sans fil Pending WO2025214611A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2024/060009 WO2025214611A1 (fr) 2024-04-12 2024-04-12 Dispositifs et procédés de transition de bss fiable dans un réseau sans fil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2024/060009 WO2025214611A1 (fr) 2024-04-12 2024-04-12 Dispositifs et procédés de transition de bss fiable dans un réseau sans fil

Publications (1)

Publication Number Publication Date
WO2025214611A1 true WO2025214611A1 (fr) 2025-10-16

Family

ID=90735005

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2024/060009 Pending WO2025214611A1 (fr) 2024-04-12 2024-04-12 Dispositifs et procédés de transition de bss fiable dans un réseau sans fil

Country Status (1)

Country Link
WO (1) WO2025214611A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150350974A1 (en) * 2014-05-30 2015-12-03 Qualcomm Incorporated Enhancement for bss transition, load balancing and ap selection
EP2742618B1 (fr) * 2011-08-11 2016-07-06 LG Electronics Inc. Procédé et appareil de sélection de fréquence dynamique dans un système de réseau local sans fil
WO2021207474A1 (fr) * 2020-04-08 2021-10-14 Qualcomm Incorporated Indications précoces de mise à jour critiques pour dispositifs à liaisons multiples
US20230053972A1 (en) * 2021-08-23 2023-02-23 Qualcomm Incorporated Non-simultaneous transmit-receive (nstr) soft access point (ap) multi-link device (mld)

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2742618B1 (fr) * 2011-08-11 2016-07-06 LG Electronics Inc. Procédé et appareil de sélection de fréquence dynamique dans un système de réseau local sans fil
US20150350974A1 (en) * 2014-05-30 2015-12-03 Qualcomm Incorporated Enhancement for bss transition, load balancing and ap selection
WO2021207474A1 (fr) * 2020-04-08 2021-10-14 Qualcomm Incorporated Indications précoces de mise à jour critiques pour dispositifs à liaisons multiples
US20230053972A1 (en) * 2021-08-23 2023-02-23 Qualcomm Incorporated Non-simultaneous transmit-receive (nstr) soft access point (ap) multi-link device (mld)

Similar Documents

Publication Publication Date Title
AU2022207565B2 (en) Multi-link reconfiguration method and apparatus
EP1861957B1 (fr) Methode et systeme pour annoncer des points d'accès candidats dans un reseau sans fil
US9414268B2 (en) User equipment and a radio network node, and methods therein for device-to-device communication
US8867487B2 (en) Wireless communication methods and components that implement handoff in wireless local area networks
US8588146B2 (en) Method and apparatus for channel selection in a wireless communication system
EP3720074A1 (fr) Procédé et appareil de configuration de signal synchrone
US8743766B2 (en) Method and system for network discovery and selection in wireless network systems
CN104081815A (zh) 用于无线网络的请求-响应过程
EP2149206A1 (fr) Système et procédé d'émission/réception d'informations de bs voisines dans un système de communication
EP3020227B1 (fr) Système de wlan et procédé et appareil de transfert utilisés dans celui-ci
WO2022022390A1 (fr) Procédé et dispositif de transmission de service de multidiffusion appliqués à de multiples liaisons
EP4356651A1 (fr) Liaison de gestion pour fonctionnement à liaisons multiples
US20240334310A1 (en) Method, device, and system for assistant cell configuration in wireless networks
US20230232268A1 (en) Measurement method, measurement apparatus, terminal, and network device
US20250056253A1 (en) Systems and methods for performing clustering updates in cell-free networks
US20250056622A1 (en) Systems and methods for performing initial clustering in cell-free networks
US20250294630A1 (en) Communication technique between multi-link devices
WO2025214611A1 (fr) Dispositifs et procédés de transition de bss fiable dans un réseau sans fil
CN108174422A (zh) 高低频切换方法、配置终端的方法及装置
CN116782152A (zh) 一种多链路数据处理方法、装置及设备
CN101523958A (zh) 通过满负荷信息来补充移动无线通信系统的相邻小区清单
US20250031267A1 (en) Method and apparatus for determining uplink transmission timing for srs transmission in one or more cells in mobile wireless communication system
CN120835287A (zh) 一种扩展服务集转移方法和装置
CN117692992A (zh) 多链路设备及其相关方法
WO2024092648A1 (fr) Procédé de communication sans fil, équipement terminal et dispositif réseau

Legal Events

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

Ref document number: 24719515

Country of ref document: EP

Kind code of ref document: A1