WO2023236166A1 - Dispositifs et procédés de coopération d'ap dans un réseau de communication sans fil - Google Patents

Dispositifs et procédés de coopération d'ap dans un réseau de communication sans fil Download PDF

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Publication number
WO2023236166A1
WO2023236166A1 PCT/CN2022/097991 CN2022097991W WO2023236166A1 WO 2023236166 A1 WO2023236166 A1 WO 2023236166A1 CN 2022097991 W CN2022097991 W CN 2022097991W WO 2023236166 A1 WO2023236166 A1 WO 2023236166A1
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WO
WIPO (PCT)
Prior art keywords
transmission
ull
station
announcement message
ull transmission
Prior art date
Application number
PCT/CN2022/097991
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English (en)
Inventor
Oren Hencinski
Doron Ezri
Ohad Klausner
Chun PAN
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Huawei Technologies Co., Ltd.
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Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to PCT/CN2022/097991 priority Critical patent/WO2023236166A1/fr
Publication of WO2023236166A1 publication Critical patent/WO2023236166A1/fr

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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
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • H04W72/512—Allocation or scheduling criteria for wireless resources based on terminal or device properties for low-latency requirements, e.g. URLLC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/27—Control channels or signalling for resource management between access points

Definitions

  • the present invention relates to wireless communications. More specifically, the present invention relates to devices and methods for access point, AP, cooperation in a wireless communication network.
  • Wireless communication networks such as IEEE 802.11 based WLANs
  • IEEE 802.11 based WLANs have become popular at an unprecedented rate.
  • conventional Internet applications such as email, file transfer, and web browsing
  • wireless communication networks such as IEEE 802.11 based WLANs
  • real time applications such as enterprise applications in the industry safety domain, increasing the demand for low latency connections.
  • WLANs deployed in the enterprise domains often comprise a plurality of access points, APs, wherein due to the limited unlicensed spectrum (both at 5 GHz and 2.4 GHz) it is often necessary to allocate the same channel to more than one AP.
  • the amendment IEEE 802.11ax introduces OFDMA transmission which may lead to long multi-user, MU, transmission in the order of 5 ms and longer.
  • MU OFDAM downlink transmission is started in another basic serving set, OBSS, this generates a huge delay for other APs operating on the same channel resulting in a large latency, which may be disadvantageous for numerous applications, such as enterprise applications in the industry safety domain.
  • an access point for a wireless communication network, in particular an IEEE 802.11 based WLAN.
  • the AP is configured to communicate with a non-AP station associated with the AP and at least one further OBSS AP of the wireless communication network associated with one or more further non-AP stations.
  • the AP comprises a processing circuitry configured to schedule an ultra-low latency, ULL, transmission to the non-AP station associated with the AP at an ULL transmission time:
  • the AP comprises a communication interface configured to send an ULL transmission announcement message (herein also referred to as an OBSS pre-emptive transmission request) to the at least one further OBSS AP.
  • the ULL transmission announcement message comprises information about the ULL transmission time for preventing the at least one further OBSS AP to transmit at the ULL transmission time.
  • the communication interface is further configured to start the ULL transmission to the non-AP station associated with the AP at the scheduled ULL transmission time without waiting for an ACK message from the at least one further OBSS AP in response to the ULL transmission announcement message.
  • an improved AP for a wireless communication network allowing for low latency communication.
  • Embodiments disclosed herein allow improving the time-sharing interference mitigation capabilities, in particular in enterprise/industry deployments with a plurality of densely spaced APs. By better mitigating the Wi-Fi time sharing OBSS interference, embodiments disclosed herein allow reducing the latency to the order of a few milliseconds, which is essential for numerous applications, for instance, applications in the industry safety domain.
  • the communication interface is configured to start the ULL transmission to the non-AP station associated with the AP at the ULL transmission time, once a backoff timer has expired.
  • the ULL transmission time is substantially equal to the time, when the backoff timer expires, e.g. when the backoff timer reaches zero.
  • the communication interface is configured to send the ULL transmission announcement message to the at least one further AP via a wired or wireless connection.
  • the processing circuitry is configured to determine a first transmission power of the further OBSS AP at the AP and the communication interface is configured to send the ULL transmission announcement message to the further OBSS AP, if the first transmission power is larger than a first transmission power threshold.
  • the communication interface is further configured to receive from the non-AP station information about a second transmission power of the further OBSS AP at the non-AP station and to send the ULL transmission announcement message to the further OBSS AP, if the second transmission power is larger than the first transmission power threshold and smaller than a second transmission power threshold, wherein the second transmission power threshold is larger than the first transmission power threshold.
  • a method of operating an access point, AP configured to communicate with a non-AP station associated with the AP and at least one further OBSS AP associated with one or more further non-AP stations.
  • the method comprises the steps of:
  • the ULL transmission announcement message comprises information about the ULL transmission time for preventing the at least one further OBSS AP to transmit at the ULL transmission time
  • the method according to the second aspect of the present disclosure can be performed by the AP according to the first aspect of the present disclosure.
  • further features of the method according to the second aspect of the present disclosure result directly from the functionality of the AP according to the first aspect of the present disclosure as well as its different implementation forms described above and below.
  • an access point configured to communicate with a non-AP station associated with the AP and at least one further OBSS AP associated with one or more further non-AP stations.
  • the AP comprises a communication interface configured to receive an ULL transmission announcement message from the at least one further OBSS AP, wherein the ULL transmission announcement message comprises information about a ultra-low latency, ULL, transmission time scheduled for a ULL transmission of the at least one further OBSS AP to the one or more further non-AP stations.
  • the AP comprises a processing circuitry configured to abort, in response to receiving the ULL transmission announcement message, a current transmission to the non-AP station ongoing at the ULL transmission time.
  • the communication interface is configured to receive the ULL transmission announcement message to the at least one further AP via a wired or wireless connection.
  • the communication interface is configured to resume the current transmission in a subsequent transmission opportunity.
  • a method of operating an access point, AP comprising the steps of:
  • the ULL transmission announcement message comprises information about an ULL transmission time scheduled for a ULL transmission of the at least one further OBSS AP to the one or more further non-AP stations;
  • the method according to the fourth aspect of the present disclosure can be performed by the AP according to the third aspect of the present disclosure.
  • further features of the method according to the fourth aspect of the present disclosure result directly from the functionality of the AP according to the third aspect of the present disclosure 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 an exemplary wireless communication network, including an AP and a further AP according to an embodiment
  • Fig. 2 shows a timing diagram illustrating the interaction between an AP and a further AP in a wireless communication network according to an embodiment
  • FIG. 3 shows a flow diagram illustrating processing steps implemented by an AP according to an embodiment
  • Fig. 4 shows a flow diagram illustrating processing steps implemented by a further AP according to an embodiment.
  • 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 an exemplary wireless communication network 100, in a particular local area network, WLAN 100, based on the IEEE 802.11 framework of standards.
  • the wireless communication network 100 comprises an access point, AP, 110 associated, by way of example with two non-AP stations 117, which, as illustrated in figure 1, may comprise a smartphone, laptop computer or another type of wireless communication device.
  • AP access point
  • non-AP stations 117 may comprise a smartphone, laptop computer or another type of wireless communication device.
  • the two non-AP stations 117 may communicate with further networks connected to the AP 110, in particular the Internet.
  • the AP 110 comprises a processing circuitry 111 and a communication interface 113, in particular a wireless communication interface 113, for example 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 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 wireless communication network 100 comprises at least one further AP 130 associated, by way of example with one non-AP station 137, which, as illustrated in figure 1, may comprise a smartphone, laptop computer or another type of wireless communication device.
  • the non-AP station 137 may communicate with further networks connected to the further AP 130, in particular the Internet.
  • the further AP 130 and its associated non-AP station 137 define an overlapping basic service set (OBSS) relative to the BSS defined by the AP 110 and its associated non-AP stations 117.
  • OBSS overlapping basic service set
  • the further AP 130 comprises a processing circuitry 131 and a communication interface 133, in particular a wireless communication interface 133, for example in accordance with the IEEE 802.11 framework of standards.
  • the processing circuitry 131 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 arrays (FPGAs) , digital signal processors (DSPs) , or general-purpose processors.
  • the further AP 130 may further comprise a memory 135 configured to store executable program code which, when executed by the processing circuitry 131, causes the further AP 130 to perform the functions and methods described herein.
  • the AP 110 is configured to communicate with the at least one further OBSS AP 130 of the wireless communication network 100 via a communication channel 120, which may be a wired or a wireless communication channel 120, such as a wired backbone connection or the air interface.
  • a communication channel 120 which may be a wired or a wireless communication channel 120, such as a wired backbone connection or the air interface.
  • the processing circuitry 111 of the AP 110 (referred to as AP 2 in figure 2) is configured to schedule an ultra-low latency, ULL, transmission to one or more of its associated non-AP stations 117 at an ULL transmission time.
  • the communication interface 113 of the AP 110 is configured to send an ULL transmission announcement message (in figure 2 referred to as an OBSS pre-emptive transmission request) to the at least one further OBSS AP 130 (referred to as AP 1 in figure 2) .
  • the ULL transmission announcement message comprises information about the ULL transmission time for preventing the at least one further OBSS AP 130 to transmit at the scheduled ULL transmission time.
  • the communication interface 113 of the AP 110 is further configured to start the ULL transmission to the one or more of its associated non-AP stations 117 at the scheduled ULL transmission time without waiting for an ACK message from the at least one further OBSS AP 130.
  • an exemplary scheduled ULL transmission time is indicated by the dashed line.
  • the communication interface 133 of the further AP 130 is configured to receive the ULL transmission announcement message from the AP 110, wherein, as already described above, the ULL transmission announcement message comprises the information about the ULL transmission time scheduled for the ULL transmission of AP 110 to the one or more of its associated non-AP stations 117.
  • the processing circuitry 131 of the further AP 130 is configured to abort any current transmission to its associated non-AP station 137, which would not end before the ULL transmission time. This is illustrated in figure 2, where, in response to receiving the ULL transmission announcement message from the AP 110, the processing circuitry 131 of the AP 130 stops the current transmission 201, 203 (e.g.
  • the communication interface 113 of the AP 110 may start the ULL transmission 205 to the one or more of its associated non-AP stations 117 at the scheduled ULL transmission time without having to wait for an ACK message from the further AP 130.
  • the communication interface 113 of the AP 110 is configured to start the ULL transmission to the non-AP stations 117 associated with the AP 110 at the ULL transmission time, once a backoff timer has expired.
  • the ULL transmission time is substantially equal to the time, when the backoff timer expires, e.g. when the backoff timer reaches zero.
  • the processing circuitry 111 of the AP 110 is configured to determine a first transmission power of the further OBSS AP 130 at the AP 110 and the communication interface 113 of the AP 110 is configured to send the ULL transmission announcement message 205 to the further OBSS AP 130, if the first transmission power is larger than a first transmission power threshold. In other words, if the transmission power of the further AP 130 received by the AP 110 is small enough, it may not be necessary to send the ULL transmission announcement message 205 to the further OBSS AP 130.
  • the communication interface 113 of the AP 110 is further configured to receive from one or more of its associated non-AP stations 117 information about a second transmission power of the further OBSS AP 130 at the non-AP stations 117 associated with the AP 110 and to send the ULL transmission announcement message 205 to the further OBSS AP 130, if the second transmission power is larger than the first transmission power threshold and smaller than a second transmission power threshold, wherein the second transmission power threshold is larger than the first transmission power threshold.
  • the AP 110 may define an OBSS pre-emptive transmission group of further APs, including the further AP 130.
  • the AP 110 may send the ULL transmission announcement message only to those further APs, which are received by the AP 110 above a specific SR threshold, i.e. the first transmission power threshold, such as greater than -62 dBm, and/or to those further APs, which are received below the first transmission power threshold but with high probability leading to low SIR at the non-AP station (s) 117 (as defined by the second power transmission threshold) .
  • the AP 110 may be configured to receive reports about the transmission power of the further AP (s) 130 from its associated non-AP station (s) 117.
  • the further AP 130 should immediately abort any ongoing transmissions. Depending on its capabilities the further AP 130 may abort any ongoing transmission at one of the following boundaries: MAC MSDU, MAC MPDU, PHY LDPC block and/or PHY Symbol.
  • FIG. 3 shows a flow diagram illustrating processing steps of a method 300 implemented by the AP 110 according to an embodiment for operating the AP 110.
  • the method 300 comprises a step 301 of scheduling an ULL transmission to the one or more non-AP stations 117 associated with the AP 110 for an ULL transmission time.
  • the method 300 comprises a step 303 of sending an ULL transmission announcement message to the at least one further OBSS AP 130, wherein the ULL transmission announcement message comprises information about the ULL transmission time for preventing the at least one further OBSS AP 130 to transmit at the scheduled ULL transmission time.
  • the method 300 further comprises a step 305 of starting the ULL transmission 205 to the non-AP station (s) 117 associated with the AP 110 at the ULL transmission time without waiting for an ACK message from the at least one further OBSS AP 130 in response to the ULL transmission announcement message.
  • FIG. 4 shows a flow diagram illustrating processing steps of a method 400 implemented by the further AP 130 according to an embodiment for operating the further AP 130.
  • the method 400 comprises a step 401 of receiving an ULL transmission announcement message from the AP 110, wherein the ULL transmission announcement message comprises information about a ULL transmission time scheduled for a ULL transmission of the AP 110 to one or more of its associated non-AP stations 117.
  • the method 400 comprises a step 403 of aborting, in response to receiving the ULL transmission announcement message from the AP 110, a current transmission 201 to its associated non-AP station (s) 137 ongoing at the ULL transmission time.
  • the method 400 may comprise a further step of resuming the aborted transmission 201 by the further AP 130 in a subsequent transmission opportunity.
  • 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 invention 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.

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

Abstract

L'invention concerne un point d'accès, AP, (110) et un autre AP (130). L'AP (110) est conçu pour communiquer avec une station non-AP (117) associée à l'AP (110) et à l'autre AP (130). L'AP (110) comprend une circuiterie de traitement (111) conçue pour planifier une transmission à très faible latence, ULL, à la station non AP (117) associée à l'AP (110) pendant un temps de transmission ULL. De plus, L'AP (110) comprend une interface de communication (113) conçue pour envoyer un message d'annonce de transmission ULL à l'autre AP (130). Le Message d'annonce de transmission ULL comprend des informations concernant le temps de transmission ULL. L'interface de communication (113) est en outre conçue pour démarrer la transmission ULL vers la station non-AP (117) associée à l'AP (110) au moment du temps de transmission ULL.
PCT/CN2022/097991 2022-06-10 2022-06-10 Dispositifs et procédés de coopération d'ap dans un réseau de communication sans fil WO2023236166A1 (fr)

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PCT/CN2022/097991 WO2023236166A1 (fr) 2022-06-10 2022-06-10 Dispositifs et procédés de coopération d'ap dans un réseau de communication sans fil

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PCT/CN2022/097991 WO2023236166A1 (fr) 2022-06-10 2022-06-10 Dispositifs et procédés de coopération d'ap dans un réseau de communication sans fil

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018175420A1 (fr) * 2017-03-20 2018-09-27 Convida Wireless, Llc Planification et commande dans une nouvelle radio en ayant recours à une indication de pré-emption
WO2019032844A1 (fr) * 2017-08-10 2019-02-14 Intel IP Corporation Indication de préemption pour nouvelle radio

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018175420A1 (fr) * 2017-03-20 2018-09-27 Convida Wireless, Llc Planification et commande dans une nouvelle radio en ayant recours à une indication de pré-emption
WO2019032844A1 (fr) * 2017-08-10 2019-02-14 Intel IP Corporation Indication de préemption pour nouvelle radio

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
CATT: "Further design considerations for DL pre-emption indication", 3GPP DRAFT; R1-1712422, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Prague, Czechia; 20170821 - 20170825, 20 August 2017 (2017-08-20), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051315238 *
FUJITSU: "Discussion on Preemption Indicator for Multiplexing eMBB and URLLC in Downlink", 3GPP DRAFT; R1-1701920 PREEMPTION BASED MULTIPLEXING FOR EMBB AND URLLC, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Athens, Greece; 20170213 - 20170217, 12 February 2017 (2017-02-12), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051209082 *
NOKIA, ALCATEL-LUCENT SHANGHAI BELL: "On indication for downlink punctured / preemptive scheduling", 3GPP DRAFT; R1-1703327_PUNCTURED SCHEDULING_FINAL, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Athens, Greece; 20170213 - 20170217, 12 February 2017 (2017-02-12), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051210457 *

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