WO2016070567A1 - Procédé et dispositif de traitement/régulation de messages en liaison descendante, et support de stockage apparenté - Google Patents

Procédé et dispositif de traitement/régulation de messages en liaison descendante, et support de stockage apparenté Download PDF

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Publication number
WO2016070567A1
WO2016070567A1 PCT/CN2015/075976 CN2015075976W WO2016070567A1 WO 2016070567 A1 WO2016070567 A1 WO 2016070567A1 CN 2015075976 W CN2015075976 W CN 2015075976W WO 2016070567 A1 WO2016070567 A1 WO 2016070567A1
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Prior art keywords
message
downlink
downlink message
control module
uplink
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PCT/CN2015/075976
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English (en)
Chinese (zh)
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黄河
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中兴通讯股份有限公司
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    • 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

Definitions

  • the present invention relates to the field of communications, and in particular, to a downlink message processing/control method, apparatus, and related computer storage medium.
  • WLAN Wireless Local Area Networks
  • the initial version of the 802.11 standard was completed in 1997.
  • the main idea is derived from the Ethernet defined by the 802.3 protocol. Therefore, the Media Access Control (MAC) of 802.11 adopts the same simple distributed connection as Ethernet.
  • Incoming protocol that is, Carrier Sense Multiple Access (CSMA).
  • CSMA Carrier Sense Multiple Access
  • each station (Station, referred to as STA) in the network can independently determine the transmission and reception of data frames.
  • STA Service
  • Each station first listens to the media before sending data: when the media is idle, the station can Send data; when the media is busy, the site needs to postpone sending data.
  • an access point (Access Point, referred to as AP) broadcast carrying service.
  • the Service Set Identifier (SSID) Beacon the STA learns the existence of the wireless network by receiving these Beacon frames and reading the SSID.
  • the STA sends a probe request for detecting the 802.11 wireless network, and receives the probe request.
  • the AP of the probe request may feed back a Probe Response carrying the SSID to the STA, and the STA may know the existence of a certain wireless network after receiving the probe response.
  • multiple APs broadcast multiple Beacon frames carrying different SSIDs or feed back multiple Probe Responses carrying different SSIDs the STA can know that there are multiple different wireless networks using the 802.11 protocol at the current location.
  • the wireless networks established by multiple APs belong to the same Extended Service Set (ESS)
  • the wireless networks they establish will use the same SSID.
  • multiple Probe responses sent to the STA by multiple APs (assumed to be N APs) carry the exact same information. If these messages can be correctly received by the STA, the N-1 of the N Probe Response messages are redundant because the STA carries the last N-1 Probe Response message and the STA receives the first message. The information in the Probe Response message is exactly the same. In other words, the time when the last N-1 Probe Response messages sent by multiple APs occupy the media is invalid.
  • the number of STAs increases, the number of Probe Requests sent by the STAs will also increase, which will cause the AP to send more Probe Responses and take up more media time. And if you don't send these messages, the media can be used to send more data, which improves the effective throughput of the network. the amount.
  • the AP replies to the STA that multiple repeated network probe responses occupy excessive media time, resulting in a problem that the effective throughput of the network is reduced. No effective solution was given.
  • embodiments of the present invention provide a downlink message processing/control method, apparatus, and related computer storage medium, which can at least improve network throughput.
  • a downlink message processing method which is applied to an AP side, and includes: an uplink message sent by a current access point (AP) receiving station (STA) to a plurality of APs with the same request content.
  • the request content is that the requesting multiple APs returns a downlink message in response to the uplink message, and the STA is a non-AP type STA; the current AP sends the uplink message to the preset downlink message control module, so that the downlink message control module determines the uplink message according to the uplink message.
  • the current AP receives the indication message of the downlink message from the current AP, the current AP receives the indication message sent by the downlink message control module, and if the content of the indication message is sent, the current AP sends the downlink message to the STA.
  • the setting manner of the downlink message control module includes: setting the inside of the AP; or setting in a separate physical device, where the physical device includes: a router, a switch, or an access controller (AC).
  • the physical device includes: a router, a switch, or an access controller (AC).
  • the current AP sends an uplink message to the preset downlink message control module, including: the current AP determines whether the uplink message meets the following conditions: the receiver address carried in the uplink message is a broadcast address; or the receiver carried by the uplink message
  • the basic service set (BSS) flag (BSSID) whose address is a multicast address and is established on the current AP belongs to the multicast address; the received power of the current AP receiving the uplink message is higher than the power threshold for correctly demodulating the uplink message; If the result is yes, the current AP sends an uplink message and a related message to the downlink message control module, where the related message packet is configured when the downlink message control module is set inside the current AP.
  • the current AP receives the received power of the uplink message, the receiving time of the current AP receiving the uplink message, and the identifier of the current AP.
  • the related message includes: receiving the uplink message by the current AP. Power and the identity of the current AP.
  • the uplink message and the downlink message are in accordance with the frame format of the medium access control layer (MAC) frame defined by the IEEE 802.11 protocol, and the receiver address carried in the uplink message is a broadcast address or a multicast address.
  • MAC medium access control layer
  • the uplink message is a Probe Request message
  • the downlink message is a Probe Response message
  • a downlink message processing apparatus which is located at an access point (AP), and includes: a receiving module, configured to receive, by a station (STA), a request for the same uplink sent to multiple APs. a message, wherein the request content is a request for a plurality of APs to return a downlink message in response to the uplink message, the STA is a non-AP type STA, and the sending module is configured to send the uplink message to a preset downlink message control module, so that the downlink message is controlled.
  • the module determines, according to the uplink message, whether the current AP sends an indication message to the STA to the STA.
  • the processing module is configured to receive the indication message sent by the downlink message control module, and send the downlink to the STA if the content of the indication message is sent. Message.
  • the setting manner of the downlink message control module includes: setting the inside of the AP; or setting in a separate physical device, where the physical device includes: a router, a switch, or an access controller (AC).
  • the physical device includes: a router, a switch, or an access controller (AC).
  • the sending module includes: a determining unit, configured to determine whether the uplink message meets the following conditions: the receiver address carried in the uplink message is a broadcast address; or the receiver address carried in the uplink message is a multicast address and is in the current AP.
  • the basic service set (BSS) flag (BSSID) established on the network belongs to the multicast address; the received power of the current AP receiving the uplink message is higher than the power threshold capable of correctly demodulating the uplink message; and the sending unit is configured to determine the judgment result of the module.
  • BSS basic service set
  • the uplink message and the related message are sent to the downlink message control module, where
  • the related message includes: the received power of the current AP receiving the uplink message, the receiving time of the current AP receiving the uplink message, and the identifier of the current AP, when the downlink message control module is set in an independent physical
  • the related message includes: the received power of the current AP receiving the uplink message and the identifier of the current AP.
  • the uplink message and the downlink message are in accordance with the frame format of the medium access control layer (MAC) frame defined by the IEEE 802.11 protocol, and the receiver address carried in the uplink message is a broadcast address or a multicast address.
  • MAC medium access control layer
  • the uplink message is a Probe Request message
  • the downlink message is a Probe Response message
  • a downlink message control method including: a preset downlink message control module receives an uplink message sent by multiple access points (APs) with the same request content, where The message is sent by the receiving station (STA) to the multiple APs.
  • the content of the request is that the multiple APs are requested to return the downlink message in response to the uplink message, and the STA is a non-AP type STA; the downlink message control module receives the downlink message according to the actual situation of the multiple APs.
  • the target AP that needs to return a downlink message to the STA is determined from the multiple APs; the downlink message control module sends an indication message to the target AP, where the indication message is used to indicate that the target AP sends the downlink message to the STA.
  • the setting manner of the downlink message control module includes: setting the inside of the AP; or setting in a separate physical device, where the physical device includes: a router, a switch, or an access controller (AC).
  • the physical device includes: a router, a switch, or an access controller (AC).
  • the downlink message control module determines, according to the actual situation that the multiple APs receive the downlink message, the target AP that needs to return the downlink message to the STA, and adopts one of the following two methods: mode one, in the downlink If the message control module is set in the internal of the AP, after waiting for the predetermined time interval, if the downlink message control module set in the current AP receives the uplink message sent by the other AP, the downlink message control module determines that the other AP receives the uplink message. Whether the current time is earlier than or equal to the time when the current AP receives the uplink message.
  • the downlink message control module selects the AP with the highest received power from all the APs that receive the uplink message.
  • the target AP sends an indication message to the AP with the highest received power.
  • the uplink message and the downlink message are in accordance with the frame format of the medium access control layer (MAC) frame defined by the IEEE 802.11 protocol, and the receiver address carried in the uplink message is a broadcast address or a multicast address.
  • MAC medium access control layer
  • the uplink message is a Probe Request message
  • the downlink message is a Probe Response message
  • a downlink message control apparatus including: a preset downlink message control module, where the downlink message control module includes: a receiving module configured to receive multiple access points (APs) Sending an uplink message with the same content of the request, where the uplink message is sent by the receiving station (STA) to the multiple APs, and the content of the request is that the multiple APs are requested to return a downlink message in response to the uplink message, and the STA is a non-AP type STA;
  • the module is configured to: determine, according to the actual situation that the multiple APs receive the downlink message, the target AP that needs to return the downlink message to the STA, and the sending module, configured to send the indication message to the target AP, where the indication message is used
  • the target AP is instructed to send a downlink message to the STA.
  • the setting manner of the downlink message control module includes: setting the inside of the AP; or setting in a separate physical device, where the physical device includes: a router, a switch, or an access controller (AC).
  • the physical device includes: a router, a switch, or an access controller (AC).
  • the determining module includes: a first processing unit configured to: after the downlink message control module is set inside the AP, after waiting for a predetermined time interval, if the downlink message control module set in the current AP receives the other
  • the uplink message sent by the AP determines other APs. Whether the time of receiving the uplink message is earlier than or equal to the time when the current AP receives the uplink message. If the judgment result is no and the power of the current AP receiving the uplink message is greater than or equal to the power of the other AP to receive the uplink message, it is determined that the current AP belongs to the target AP.
  • the second processing unit is configured to select the received power from all the APs that receive the uplink message after waiting for the predetermined time interval in the case that the downlink message control module is set in the independent physical device.
  • the largest AP acts as the target AP and sends an indication message to the AP with the highest received power.
  • the uplink message and the downlink message are in accordance with the frame format of the medium access control layer (MAC) frame defined by the IEEE 802.11 protocol, and the receiver address carried in the uplink message is a broadcast address or a multicast address.
  • MAC medium access control layer
  • the uplink message is a Probe Request message
  • the downlink message is a Probe Response message
  • the embodiment of the present invention further provides a first type of computer storage medium, wherein the first type of computer storage medium stores a first set of computer executable instructions, and the first set of computer executable instructions are used to perform the foregoing application to the AP Side downlink message processing/control method.
  • the embodiment of the present invention further provides a second computer storage medium, wherein the second computer storage medium stores a second set of computer executable instructions, and the second set of computer executable instructions are used to perform the foregoing application to the downlink.
  • the downlink message processing/control method, the device, and the computer storage medium provided by the embodiment of the present invention can prevent the AP from replying to the STA with a duplicate Probe Response message, and reducing the time occupied by the invalid Probe Response message.
  • the effect of increasing the effective throughput of the network is achieved.
  • FIG. 1 is a flowchart of a downlink message processing method according to an embodiment of the present invention
  • FIG. 2 is a structural block diagram of a downlink message processing apparatus according to an embodiment of the present invention.
  • FIG. 3 is a block diagram showing the structure of a preferred downlink message processing apparatus according to an embodiment of the present invention.
  • FIG. 4 is a flowchart of a downlink message control method according to an embodiment of the present invention.
  • FIG. 5 is a structural block diagram of a downlink message control apparatus according to an embodiment of the present invention.
  • FIG. 6 is a structural block diagram of a preferred downlink message control apparatus according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of an independent setting of a downlink message control module according to a preferred embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a downlink message control module being disposed inside an AP according to a preferred embodiment of the present invention.
  • 9A is a flowchart of an uplink message sent by an AP receiving a STA when a downlink message control module is independently set according to a preferred embodiment of the present invention
  • 9C is a flowchart of indicating that an AP sends a message to a STA sent by an AP receiving a downlink message control module when the downlink message control module is independently set according to a preferred embodiment of the present invention
  • FIG. 10 is a message processing flowchart of a downlink message control module being set inside an AP according to a preferred embodiment of the present invention
  • FIG. 11 is a schematic structural diagram of each module in a system for improving air interface utilization according to a preferred embodiment of the present invention.
  • Figure 12 is a schematic illustration of various modules in a system for improving air interface utilization in accordance with a preferred embodiment of the present invention.
  • the embodiment of the invention provides a downlink message processing method, which can be applied to an AP.
  • side. 1 is a flowchart of a downlink message processing method according to an embodiment of the present invention. As shown in FIG. 1, the method includes the following steps (step S102 - step S106):
  • Step S102 The current access point (AP) receives an uplink message sent by the station (STA) to the multiple APs with the same request content, where the request content is that the requesting multiple APs returns a downlink message in response to the uplink message, and the STA is a non-AP class. STA.
  • Step S104 The current AP sends an uplink message to the preset downlink message control module, so that the downlink message control module determines, according to the uplink message, whether an indication message of the downlink message is sent by the current AP to the STA.
  • Step S106 The current AP receives the indication message sent by the downlink message control module, and if the content of the indication message is sent, the current AP sends a downlink message to the STA.
  • the downlink message control module can determine whether to forward the downlink message for the feedback to the STA for the AP that forwards the uplink message, so that the other party does not need to reply to the STA for the downlink message, and the AP is reduced to the STA.
  • the number of messages thereby increasing the idle time of the air interface.
  • the setting manner of the downlink message control module may include the following two types: (1) being set inside the AP; or (2) being set in an independent physical device, where Equipment includes: routers, switches, or access controllers (ACs).
  • Equipment includes: routers, switches, or access controllers (ACs).
  • the physical device is not limited thereto, and for example, other network devices having a network relay function are also possible.
  • step S104 the uplink message is sent to the AP to the preset downlink message control module, which can be implemented in this manner:
  • the current AP determines whether the uplink message satisfies the following conditions: the receiver address carried by the uplink message is a broadcast address; or the receiver address of the uplink message is a multicast address and the basic service set (BSS) flag established on the current AP (BSSID) belongs to the multicast address; the received power of the current AP receiving the uplink message is higher than the power threshold capable of correctly demodulating the uplink message;
  • BSS basic service set
  • the current AP sends the uplink message and the related message to the downlink message control module, where when the downlink message control module is set inside the current AP, the related message includes: receiving, by the current AP, the uplink message. The power, the receiving time of the current AP receiving the uplink message, and the identifier of the current AP.
  • the related message includes: the received power of the current AP receiving the uplink message and the identifier of the current AP. That is to say, when the setting mode of the downlink message control module is different, the content of the related message is different.
  • the uplink message and the downlink message are in accordance with a frame format of a medium access control layer (MAC) frame defined by the IEEE 802.11 protocol, where the receiver address carried in the uplink message is a broadcast address. Or multicast address.
  • the uplink message may be a Probe Request message
  • the downlink message may be a Probe Response message.
  • the uplink message and the downlink message may also be other types of messages.
  • FIG. 2 is a structural block diagram of a downlink message processing apparatus according to an embodiment of the present invention. As shown in FIG. 2, the apparatus includes: a receiving module 10, a sending module 20, and a processing module 30. among them:
  • the receiving module 10 is configured to receive an uplink message sent by the station (STA) to the multiple APs with the same request content, where the request content is a request for the multiple APs to return a downlink message in response to the uplink message, and the STA is a non-AP type STA.
  • STA station
  • the receiving module 10 is configured to receive an uplink message sent by the station (STA) to the multiple APs with the same request content, where the request content is a request for the multiple APs to return a downlink message in response to the uplink message, and the STA is a non-AP type STA.
  • the sending module 20 is configured to send the uplink message to the preset downlink message control module, so that the downlink message control module determines, according to the uplink message, whether the current AP sends an indication message of the downlink message to the STA.
  • the processing module 30 is configured to receive the indication message sent by the downlink message control module, and send the downlink message to the STA if the content of the indication message is sent.
  • the setting manner of the downlink message control module may include the following two types: (1) being set inside the AP; or (2) being disposed in an independent physical device, where Physical devices include: routers, switches, or access controllers (ACs).
  • Physical devices include: routers, switches, or access controllers (ACs).
  • an embodiment of the present invention further provides a preferred downlink message processing apparatus.
  • 3 is a structural block diagram of a preferred downlink message processing apparatus according to an embodiment of the present invention. As shown in FIG. 3, in the preferred downlink message processing apparatus:
  • the sending module 20 can progress one step including: a determining unit 22 and a transmitting unit 24, wherein:
  • the determining unit 22 is configured to determine whether the uplink message satisfies the following conditions: the receiver address carried in the uplink message is a broadcast address; or the receiver address carried in the uplink message is a multicast address and the basic service set established on the current AP ( The BSS) flag belongs to the multicast address; the received power of the current AP receiving the uplink message is higher than the power threshold for correctly demodulating the uplink message.
  • the sending unit 24 is configured to send the uplink message and the related message to the downlink message control module if the determination result of the determining unit 22 is YES, wherein when the downlink message control module is set inside the current AP, the related message includes The receiving power of the current AP receiving the uplink message, the receiving time of the current AP receiving the uplink message, and the identifier of the current AP.
  • the related message includes: the receiving power of the current AP receiving the uplink message. And the identity of the current AP.
  • the uplink message and the downlink message that can be processed comply with the frame format of the Medium Access Control Layer (MAC) frame defined by the IEEE 802.11 protocol, where the receiver address carried in the uplink message is Broadcast address or multicast address. Further, the uplink message is a Probe Request message, and the downlink message is a Probe Response message.
  • MAC Medium Access Control Layer
  • the receiving module 10, the sending module 20, the processing module 30, the determining unit 22, and the sending unit 24 may each be a central processing unit (CPU). Or digital signal processing (DSP, Digital Signal Processor), or microprocessor (MPU, Micro Processor Unit), or Field Programmable Gate Array (FPGA).
  • CPU central processing unit
  • DSP Digital Signal Processor
  • MPU Micro Processor Unit
  • FPGA Field Programmable Gate Array
  • the embodiment of the invention further provides a downlink message control method.
  • 4 is a flowchart of a downlink message control method according to an embodiment of the present invention. As shown in FIG. 4, the method includes the following steps (step S402 - step S406):
  • Step S402 the preset downlink message control module receives an uplink message sent by multiple access points (APs) with the same request content, where the uplink message is sent by the receiving station (STA) to multiple APs, and the request content is requested.
  • the APs return downlink messages in response to the uplink message, and the STAs are non-AP class STAs.
  • Step S404 The downlink message control module determines, according to the actual situation that the multiple APs receive the downlink message, the target AP that needs to return the downlink message to the STA from the multiple APs.
  • Step S406 The downlink message control module sends an indication message to the target AP, where the indication message is used to indicate that the target AP sends the downlink message to the STA.
  • the downlink message control module can determine which APs or which APs need to feed back the downlink messages to the STAs from multiple APs that receive the uplink message, so that multiple APs can repeatedly prevent the downlink messages from being fed back to the STAs. Reduce the occupation of media time and provide network throughput.
  • the setting manner of the downlink message control module may include the following two types: (1) being set inside the AP; or (2) being set in an independent physical device, where Equipment includes: routers, switches, or access controllers (ACs).
  • Equipment includes: routers, switches, or access controllers (ACs).
  • the downlink message control module can also be set in other network relay devices.
  • step S404 in a preferred embodiment of the embodiment of the present invention, the following manner may be implemented:
  • the downlink message control module determines other Whether the time when the AP receives the uplink message is earlier than or equal to the time when the current AP receives the uplink message. If the judgment result is no and the power of the current AP receiving the uplink message is greater than or equal to the power of the other APs to receive the uplink message, it is determined that the current AP belongs to the target AP. And send an indication message to the current AP.
  • the downlink message control module selects the AP with the highest received power as the target AP from all the APs that receive the uplink message, and The indication message is sent to the AP with the highest received power.
  • the selection of the two implementation manners is mainly determined according to the setting manner of the downlink message control module, and the first method is applicable to the internal situation of the downlink message control module being set in the AP, and the second method is applicable to the downlink.
  • the message control module is set in a separate physical device.
  • the uplink message and the downlink message that can be controlled by the downlink message control module are in accordance with the frame format of the Medium Access Control Layer (MAC) frame defined by the IEEE 802.11 protocol, where the uplink message carries The recipient address is a broadcast address or a multicast address. Further, the uplink message is a Probe Request message, and the downlink message is a Probe Response message.
  • MAC Medium Access Control Layer
  • FIG. 5 is a structural block diagram of a downlink message control apparatus according to an embodiment of the present invention.
  • the apparatus includes: a preset downlink message control module, where the downlink message control module includes: a receiving module 40, a determining module 50, and a sending Module 60. among them:
  • the receiving module 40 is configured to receive an uplink message sent by multiple access points (APs) with the same request content, where the uplink message is sent by the receiving station (STA) to multiple APs, and the content is requested.
  • the STA is a non-AP class STA.
  • the determining module 50 is configured to determine, from the plurality of APs, a target AP that needs to return a downlink message to the STA according to the actual situation that the multiple APs receive the downlink message.
  • the sending module 60 is configured to send an indication message to the target AP, where the indication message is used to indicate that the target AP sends the downlink message to the STA.
  • the setting manner of the downlink message control module may include the following two types: (1) being set inside the AP; or (2) being set in an independent physical device, where the physical device includes: a router and a switch. Or access controller (AC).
  • the physical device includes: a router and a switch.
  • access controller AC
  • FIG. 6 is a structural block diagram of a preferred downlink message control apparatus according to an embodiment of the present invention. As shown in Figure 6, in the preferred downlink message control device:
  • the determining module 50 may further include: a first processing unit 52 and a second processing unit 54, wherein:
  • the first processing unit 52 is configured to: when the downlink message control module is set inside the AP, after waiting for the predetermined time interval, if the downlink message control module set in the current AP receives the uplink message sent by the other AP, determining Whether the time when the other AP receives the uplink message is earlier than or equal to the time when the current AP receives the uplink message. If the judgment result is no and the power of the current AP receiving the uplink message is greater than or equal to the power of the other AP to receive the uplink message, it is determined that the current AP belongs to the target. The AP sends an indication message to the current AP.
  • the second processing unit 54 is configured to: when the downlink message control module is set in the independent physical device, select the AP with the highest received power as the target AP from all the APs that receive the uplink message after waiting for the predetermined time interval. And sending an indication message to the AP with the highest received power.
  • controllable uplink message and the downlink message conform to the frame format of the Medium Access Control Layer (MAC) frame defined by the IEEE 802.11 protocol, wherein the receiver address carried in the uplink message Is a broadcast address or a multicast address.
  • MAC Medium Access Control Layer
  • the uplink message is Probe Request message
  • the downlink message is a Probe Response message.
  • the receiving module 40, the determining module 50, the transmitting module 60, the first processing unit 52, and the second processing unit 54 may each be processed by a central processing unit (CPU), or digital signal processing (DSP), or microprocessor. (MPU), or Field Programmable Gate Array (FPGA), etc.
  • CPU central processing unit
  • DSP digital signal processing
  • MPU microprocessor
  • FPGA Field Programmable Gate Array
  • the AP may send the uplink message to the downlink message control module, and according to an instruction of the downlink message control module, determine whether to respond to the downlink message of the STA for the downlink message.
  • the power of the uplink message arriving at the receiving antenna of the AP should be higher than the first threshold (ie, the above power threshold, the first threshold is the power strength of the radio frame of the 802.11 protocol that the AP receiver can normally demodulate, generally -85 dBm).
  • the AP can correctly demodulate the message.
  • the downlink message control module determines which AP sends the uplink message to the uplink message.
  • the STA replies to the downlink message.
  • FIG. 7 is a schematic diagram of the independent setting of the downlink message control module according to a preferred embodiment of the present invention, that is, the case (1): the downlink message control module may be a separate physical device (for example, a router) independent of the AP.
  • a switch or an access controller (Access Controller, abbreviated as AC) the downlink message control module and the AP can be directly connected or connected through Ethernet. In this case, all APs only need downlink messages.
  • the control module performs signaling interaction.
  • FIG. 8 is a diagram showing a downlink message control module disposed in accordance with a preferred embodiment of the present invention.
  • the internal diagram of the AP that is, the situation (2):
  • the downlink message control module can also be a module inside the AP.
  • the APs can be directly connected or connected through Ethernet. In this case, each AP needs to be located in the AP.
  • the downlink message control module in other APs performs signaling interaction, and the APs can be synchronized by means of a Global Positioning System (GPS).
  • GPS Global Positioning System
  • FIG. 9A is a flowchart of an uplink message sent by an AP receiving an STA when the downlink message control module is independently set according to a preferred embodiment of the present invention. As shown in FIG. 9A, the process includes:
  • S9A01 The AP receives the uplink message sent by the STA and executes S9A02.
  • S9A02 If the address of the uplink message is a broadcast address or a multicast address, the BSSID of the basic service set (Basic Service Set, BSS) established on the local AP belongs to the multicast address, and the received signal strength of the uplink message is higher than
  • the first threshold ie, the above power threshold, the first threshold is that the AP receiver can normally demodulate the power strength of the 802.11 protocol radio frame, generally -85 dBm
  • the AP executes S9A03; otherwise, the process ends.
  • the AP sends the uplink message sent by the STA, the received power of the uplink message sent by the STA, and the flag of the AP to the downlink message control module.
  • FIG. 9B is a flowchart of a downlink message control module receiving an uplink message forwarded by an AP when the downlink message control module is independently set according to a preferred embodiment of the present invention. As shown in FIG. 9B, the process includes:
  • S9B01 The downlink control module receives the uplink message of the STA sent by the AP, and executes S9B02.
  • the downlink control module determines whether a timer for the STA is set according to the first transmission delay (the first transmission delay is a transmission delay of transmitting signals between APs in a network connecting different APs), if Yes, execute S9B03, if no, execute S9B04.
  • the downlink control module selects the uplink message of the STA.
  • An AP that receives the strongest power indicates that the AP replies to the STA with a downlink message, then stops the timer for the STA set according to the first transmission delay, and clears the timer.
  • S9B04 The downlink control module starts a timer for the STA according to the first transmission delay.
  • FIG. 9C is a flowchart of the AP receiving the downlink message control module and instructing the AP to reply to the STA by the downlink message control module according to a preferred embodiment of the present invention. As shown in FIG. 9C, the process includes:
  • S9C01 The AP receives an instruction from the downlink message controller to return a downlink message to the STA, and executes S9C02.
  • S9C02 The AP replies to the STA with a downlink message.
  • FIG. 10 is a message processing flowchart of a downlink message control module being set in an AP according to a preferred embodiment of the present invention. As shown in FIG. 10, the process includes:
  • S1001 The AP receives the uplink message sent by the STA, and executes S1002.
  • S1002 If the address of the uplink message is a broadcast address or a multicast address, and the BSSID of the BSS established on the AP belongs to the multicast address, and the received signal strength of the uplink message is higher than the first received power threshold, the AP performs S1003. ; otherwise, the process ends.
  • the AP sends the uplink message, the time when the uplink message is received, the received power strength of the uplink message, and the identifier of the AP to the downlink message control module of the local AP and other APs.
  • the downlink message control module of the AP waits for the first transmission delay when receiving the uplink message of the STA received by the AP (the first transmission delay is a transmission delay of the signal transmitted between the APs in the network connected to different APs) After that, it is judged whether the uplink message received by the STA has been received from other APs: if not, then S1008 is performed; if yes, then S1005 is performed.
  • S1005 Determine whether there is a time when the other AP receives the message earlier than the time when the AP receives the uplink message: Yes, the present invention ends; otherwise, S1006 is performed.
  • S1006 It is determined whether other APs and the AP receive the same time of the uplink message, if If yes, execute S1007; if no, execute S1008.
  • S1007 Determine whether the received power strength of the uplink message received by the AP is greater than or equal to the received power strength of the uplink message received by the other AP, and if yes, execute S1008; if not, the process ends.
  • the downlink message control module of the AP instructs the AP to reply to the STA for the downlink message.
  • the AP After receiving the instruction that the AP downlink message control module instructs the STA to reply to the downlink message, the AP returns a downlink message to the STA according to the definition of IEEE80.211. If the AP does not receive an instruction from the AP downlink control module to reply to the STA for the downlink message, the AP does not reply to the STA.
  • the following preferred embodiment 1 and the preferred embodiment 2 provide a system for improving the air interface utilization rate. It should be noted that the system provided by the two preferred embodiments may include the foregoing embodiment as a downlink message processing/control device. The downlink message processing/control method provided by the above embodiment can also be implemented.
  • FIG. 11 is a schematic structural diagram of each module in a system for improving air interface utilization according to a preferred embodiment of the present invention.
  • the downlink message control module is located in a router that connects different APs.
  • the STA When the STA wants to scan the WLAN network in its area, it will listen to the Beacon frame sent by the AP, and send a broadcast message Probe Request.
  • the received request power of the Probe Request message sent by the STA at the receiving antennas of AP1 and AP2 is higher than the power required to correctly demodulate the message -85 dBm.
  • the distance between AP1 and STA is 1000 meters, and the distance between AP2 and STA is 2000 meters.
  • the propagation speed of radio waves in the air is 300000000 m/s, so the time required for the Probe Request sent by the STA to reach AP1 is 3.33us, and the time required to reach AP2 is 6.66us.
  • AP1 when it receives the Probe Request message sent by the STA and correctly demodulates it, it finds that the message is a broadcast message, and AP1 sends the message to the downlink message control module; for AP2, when it receives the STA.
  • the Probe Request message is correctly demodulated, it is found that the message is a broadcast message, and AP2 sends the message to the downlink message control module.
  • AP1 Since AP1 receives the Probe Request sent by the STA before AP2, AP1 sends a Probe Request message to the downlink message control module before AP2.
  • the downlink message control module When the downlink message control module receives the Probe Request sent by the AP1, it does not receive the message of the other AP (ie, AP2). Therefore, the downlink message control module commands the AP1 to reply to the STA for the downlink message.
  • the downlink message control module When the downlink message control module receives the Probe Request sent by the AP2, the downlink message control module does not respond to the message sent by the AP2 because the Probe Request message sent by the AP1 has been received before.
  • the AP1 After receiving the instruction of the downlink message control module to return the downlink message to the STA, the AP1 generates a Probe Response message according to the 802.11 protocol, and sends the message to the STA.
  • AP2 does not receive the instruction of the downlink message control module, so no message is sent to the STA.
  • FIG. 12 is a schematic diagram of each module in a system for improving air interface utilization according to a preferred embodiment of the present invention.
  • the AP includes a downlink message control module, and different APs pass through. Ethernet connection.
  • the STA When the STA wants to scan the WLAN network in its area, it will listen to the Beacon frame sent by the AP, and send a broadcast message Probe Request.
  • the Probe Request message sent by the STA there are two APs: AP1 and AP2.
  • the Probe Request message sent by the STA is connected to the receiving antennas of AP1 and AP2.
  • the received power is higher than the power required to properly demodulate the message -85dBm.
  • the distance between AP1 and STA is 1000 meters, and the distance between AP2 and STA is 2000 meters. Since the propagation speed of radio waves in the air is 300,000,000 m/s, the time required for the Probe Request sent by the STA to reach AP1 is 3.33 s, and the time required to reach AP 2 is 6.66 us.
  • AP1 when it receives the Probe Request message sent by the STA and correctly demodulates it, it finds that the message is a broadcast message, and AP1 sends the message and the time of receiving the message and the received power strength to the AP.
  • the downlink message control module sends the message to the AP2 downlink message control module; The time when the message is received and the downlink message control module that receives the power strength and sent to the AP, and simultaneously sent to the downlink message control module of the AP1.
  • AP1's downlink message control module waits for 20us (5us is required for transmitting a minimum frame of 64 bytes on a 100M Ethernet network, and the switch delay is generally 6-11us). If the AP1 downlink control module receives this time, The Probe Request sent by AP2 determines the time when both AP1 and AP2 receive the STA Probe Request message. Since the AP1 is closer to the STA than the AP2, the AP1 receives the Probe Request sent by the STA 3.33us earlier than the AP2. Therefore, the downlink message control module of the AP1 receives the command AP1 to reply the downlink message to the STA.
  • the AP2 downlink message control module After receiving the Probe Request message sent by the AP2, the AP2 downlink message control module waits for 20us. Since the AP1 is closer to the STA than the AP2, the AP1 receives the Probe Request sent by the STA 3.33us earlier than the AP2. Therefore, the downlink message control module of AP2 does not command AP2 to reply to the STA for the downlink message.
  • the foregoing preferred embodiment may enable the AP that is closest to the STA to reply to the STA with a downlink message, and the other APs do not reply the downlink message to the STA, thereby preventing the AP from replying to the STA with repeated downlink messages, reducing invalidity.
  • the downlink message occupies the time of the media, thereby increasing the throughput of the IEEE 802.11 wireless network.
  • the embodiment of the present invention further provides a first type of computer storage medium, wherein the first type of computer storage medium stores a first set of computer executable instructions, and the first set of computer executable instructions are used to perform the foregoing application to the AP Side downlink message processing/control method.
  • the embodiment of the present invention further provides a second computer storage medium, wherein the second computer storage medium stores a second set of computer executable instructions, and the second set of computer executable instructions are used to perform the foregoing application to the downlink.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • the current AP receives an uplink message sent by the STA to the multiple APs with the same request content; the current AP sends the uplink message to the preset downlink message control. a module, so that the downlink message control module determines, according to the uplink message, whether an indication message of the downlink message is sent by the current AP to the STA; the current AP receives the indication message sent by the downlink message control module, and if the content of the indication message is sent, The current AP sends a downlink message to the STA.
  • the AP can prevent the AP from replying to the repeated Probe Response message to the STA, and reduce the time that the media is occupied by the invalid Probe Response message, thereby achieving the effect of improving the effective throughput of the network.

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

Abstract

La présente invention concerne, dans un mode de réalisation, un procédé et dispositif de traitement/régulation de messages en liaison descendante, ainsi qu'un support de stockage apparenté. Le procédé comporte les étapes suivantes: un AP actuel reçoit un message en liaison montante présentant le même contenu de demande envoyé à une pluralité d'AP par une station (STA), le contenu de demande demandant à la pluralité d'AP de renvoyer un message en liaison descendante en réponse au message en liaison montante, la STA étant une STA d'un type autre qu'avec AP; l'AP actuel envoie le message en liaison montante à un module prédéfini de régulation de messages en liaison descendante, afin de permettre au module de régulation de messages en liaison descendante de déterminer, d'après le message en liaison montante, si l'AP actuel envoie un message d'instructions du message en liaison descendante à la STA; l'AP actuel reçoit le message d'instructions envoyé par le module de régulation de messages en liaison descendante, et si le contenu du message d'instructions prescrit une opération d'émission, l'AP actuel envoie le message en liaison descendante à la STA.
PCT/CN2015/075976 2014-11-07 2015-04-07 Procédé et dispositif de traitement/régulation de messages en liaison descendante, et support de stockage apparenté WO2016070567A1 (fr)

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