WO2013159715A1 - 一种无线网络的发现方法及装置 - Google Patents

一种无线网络的发现方法及装置 Download PDF

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Publication number
WO2013159715A1
WO2013159715A1 PCT/CN2013/074706 CN2013074706W WO2013159715A1 WO 2013159715 A1 WO2013159715 A1 WO 2013159715A1 CN 2013074706 W CN2013074706 W CN 2013074706W WO 2013159715 A1 WO2013159715 A1 WO 2013159715A1
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Prior art keywords
message
network
probe request
request message
station
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PCT/CN2013/074706
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English (en)
French (fr)
Inventor
树贵明
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华为终端有限公司
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Publication date
Priority claimed from CN201210123899.7A external-priority patent/CN103379587B/zh
Application filed by 华为终端有限公司 filed Critical 华为终端有限公司
Priority to JP2015507356A priority Critical patent/JP5986292B2/ja
Priority to EP13781436.4A priority patent/EP2844018A4/en
Priority to SG11201510156UA priority patent/SG11201510156UA/en
Publication of WO2013159715A1 publication Critical patent/WO2013159715A1/zh
Priority to US14/522,962 priority patent/US9661561B2/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/16Discovering, processing access restriction or access information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/08Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/14Access restriction or access information delivery, e.g. discovery data delivery using user query or user detection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08Access point devices
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10Small scale networks; Flat hierarchical networks
    • H04W84/12WLAN [Wireless Local Area Networks]

Definitions

  • WiFi Wireless Fidelity
  • the WiFi STA can discover the network by sending an active scanning message by receiving a beacon message that is periodically broadcasted by the AP. If a WiFi STA needs to discover the WiFi AP existing in the vicinity as soon as possible, the WiFi STA may broadcast a probe request message (Report request), and carry the corresponding information of the requested one or more WiFi networks, that is, the WiFi AP, in the network probe request message.
  • the information identifier indicates that one or more APs that receive the Probe request in the proximity of the WiFi STA will reply to the STA with a probe response message, and include information about the WiFi AP requested by the STA in the probe response message.
  • each STA needs to scan multiple channels supported by itself when broadcasting a Probe request, send a Probe request through each channel, and wait to receive a Probe response generated by one or more AP responses in the neighboring area. It can be seen that each Probe request will cause multiple APs in the neighboring area to respond, resulting in multiple Probe responses. Therefore, for a scenario where a large number of STAs perform network discovery at almost the same time, in the network discovery phase, each channel of the STA will spend most of the time for transmitting the network discovery message Probe request and Probe response. It can be seen that the existing WiFi network discovery mechanism will cause a large number of Probe request/response messages to occupy the communication channel used by the STA and the AP, which greatly reduces the channel usage efficiency. Summary of the invention
  • an embodiment of the present invention provides a method and an apparatus for discovering a wireless network, so as to reduce a large number of network probe request messages sent by a STA due to network discovery in a wireless network discovery phase, and simultaneously reduce a network probe request message.
  • the generated probe response message improves channel usage efficiency.
  • An embodiment of the present invention provides a method for discovering a wireless network, including:
  • the station listens to the current channel before sending the first network probe request message to the access point;
  • the station When the station receives the second network probe request message sent by the other station on the current channel, the station delays sending the first network probe request message, or the station cancels sending the first network probe Request message.
  • the embodiment of the invention further provides a site, including:
  • a listening module configured to listen to a current channel before sending a first network probe request message to the access point, and trigger a message delay when receiving a second network probe request message sent by another station on the current channel Module
  • a message delay module configured to delay sending the first network probe request message
  • the message canceling submodule is configured to cancel sending the first network probe request message.
  • the network detection request message is not directly sent through the channel to perform active detection of the wireless network, but the current channel is firstly intercepted to determine the current channel. Whether the network probe request message sent by other stations is received, and when the current channel receives the network probe request message sent by other stations, the network probe request sent by the station for network discovery is reduced by delaying the sending of the network probe request message. The message, thereby reducing the probe response message generated by the network probe request message, improving channel usage efficiency.
  • FIG. 1 is a schematic flowchart of a method for discovering a wireless network according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a site according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a message delay module in FIG. 3;
  • FIG. 5 is a schematic structural diagram of another station according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of still another station according to an embodiment of the present invention. detailed description
  • the embodiment of the invention provides a method and a device for discovering a wireless network, so as to reduce a large number of network probe request messages sent by the STA for network discovery during the wireless network discovery phase, and reduce the number of network probe request messages generated by the network. Detect response messages to improve channel usage efficiency.
  • a flow of a method for discovering a wireless network according to an embodiment of the present invention includes the following steps:
  • Step 101 The station listens to the current channel before sending the first network probe request message to the access point.
  • Step 102 When the station receives the second network probe request message sent by another station on the current channel, the station delays sending the first network probe request message.
  • the first network probe request message specifically refers to a network probe request sent by the current station.
  • the message, the second network probe request message specifically refers to a network probe request message sent by another one or more stations.
  • the network when the station needs to perform the wireless network discovery, the network does not directly send the network probe request message through the channel to perform active detection of the wireless network, but firstly listens to the current channel to determine whether the current channel receives the other station to send.
  • the network probe request message when it is found that the network probe request message sent by another station is received on the current channel, reduces the network probe request message sent by the station due to network discovery by delaying the manner of sending the network probe request message, thereby reducing
  • the probe response message generated by the network probe request message improves channel usage efficiency.
  • the manner in which the station delays sending the first network probe request message refers to: the station sends the first channel sent by one or more other stations on the current channel. a network probe request message, when the station determines that the second network probe request message includes the network information identifier that is to be requested by itself, the preset time period from the receipt of the second network probe request message The first network probe request message is not sent, and waits for receiving a second probe response message sent by the neighboring wireless network access point.
  • the preset time refers to the maximum time required for the peripheral wireless network access point to send a probe response message to the site after receiving the network probe request message sent by a certain station.
  • the time value may be set by the wireless network access point itself; or set by the site that sends the network probe request message, and the corresponding time value is carried in the network probe request.
  • the method may further include:
  • the message for the wireless network discovery is sent by the neighboring wireless network access point, and includes a message carrying the wireless network information required by the station, and the message includes: a beacon message and the like.
  • the site determines that the one or more second network probe request messages sent by other stations received by the station does not include the network information identifier that is requested by the site, and does not receive other
  • the first network probe request message still needs to be sent after the preset time is reached.
  • the station does not receive the second probe response message sent by the neighboring wireless network access point within the preset time, and does not receive the message for wireless network discovery, and then arrives at the pre- After the time is set, the first network probe request message still needs to be sent.
  • the station that performs network discovery needs to listen to whether there is a network probe request message sent by another station on the channel before sending the network probe request message.
  • the station needs to parse each physical layer frame received and obtain a MAC (Media Access Control) layer frame contained in the physical layer frame, and pass the frame in the MAC layer frame header.
  • the type information determines whether the current MAC frame is a network probe request message, however, existing implementations may cause the station to consume more power.
  • the site adds indication information at the head of the physical frame of the sent message, where the indication information is used to indicate that the current message is a network probe. Request message. Specifically, the indication information is used to indicate whether the data part of the physical layer frame includes a Probe request of the MAC layer. In an actual application, the indication information may occupy one or more Bit bits of the physical frame header, and the determined value indicates whether the data part of the physical frame includes a Probe request of the MAC layer.
  • the site only needs to parse each The header portion of the physical layer frame can be used according to the indication information contained therein to know whether the physical layer frame includes a Probe request, thereby avoiding further parsing the data portion of the physical layer frame in order to obtain the included MAC layer frame content type. Operation, reducing the power consumption of the site.
  • the station passes the indication information of the header portion of a physical layer frame, and determines that the data portion of the physical layer frame includes a Probe request frame of the MAC layer, the Probe request frame needs to be obtained.
  • the content of the request information included in the request still needs to further parse the data portion of the physical layer frame to obtain the request information contained in the MAC layer frame.
  • the overall scheme will be described in detail below through specific examples.
  • the AP is an access point
  • STA1 and STA2 are two sites that perform network discovery in the AP coverage area.
  • STA1 In order to discover the WiFi network corresponding to the AP as soon as possible, STA1 is triggered to actively scan the WiFi network.
  • the specific process is as follows: The site management entity (SME) triggers the MAC layer to send a network probe request message Probe request through a scan request message (Scan request), and the site management entity carries a probe delay parameter in the Scan request message, indicating that the MAC layer is sending an active scan. Before the message Probe request, you need to wait for the time period specified by probe delay.
  • each STA needs to first monitor whether the channel is idle before using the channel to send a message, and starts the backoff time window when the channel is found to be idle, and continues to monitor the channel in the backoff time window, if Until the end of the backoff window, the channel is still idle and the Probe request is sent.
  • STA1 initiates a scan request by the site management entity at time t1, wherein the time specified by the Probe delay parameter carried in the Scan request and the backoff time are t3-tl, where the backoff time is relative to the Probe delay.
  • the time specified by the parameter is negligible. That is, STA1 will send a Probe request at time t3.
  • the Probe sends the Probe request, it usually carries one or more network information identifiers requested by itself in the Probe request.
  • the STA1 that is going to perform active network scanning receives other information during the (t3-tl) channel listening period Probe request sent by STA (such as STA2) (assuming no other messages can be received for network discovery during the period), as shown in Figure 2, it is assumed that STA1 receives the Probe request sent by STA2 at time t2, STA1 can further The Probe request message is parsed to obtain the information of the request carried by the STA2, and it is determined whether the network information identifier requested by the STA2 includes the network information identifier that the STA1 itself requests.
  • the STA1 delays sending the Probe request message and waits. Receive the Probe response message that the AP responds to STA2; if not, STA1 needs to continue to send the Probe request message before the time point t3.
  • STA1 receives the AP direction at time t4.
  • the probe response sent by STA2 can reduce the probe request message sent by STA1 in the network discovery phase and the resulting probe response sent by the AP to STA1.
  • the AP needs to respond to send a probe response within a preset time.
  • the preset time is (t5-t2).
  • STA1 is in the response probe response time specified by the AP (before t5), it has not received the probe response from the AP to STA2, and has not received other messages that can be used for network discovery (such as: If the access point AP broadcasts the Beacon message periodically, the AP actively sends or responds to other STA's probe response messages, etc., STA1 still needs the competitive channel to send the Probe request.
  • STA1 does not receive other messages that can be used for network discovery during the (t3-tl) channel listening period (such as a Beacon message periodically broadcast by the access point AP, AP active transmission or Responding to the probe response message of other STAs, etc.), but if other messages that can be used for network discovery are received during the channel listening period, such as the Beacon message periodically broadcast by the access point AP, the AP actively sends or responds to the probe of other STAs.
  • the response message, etc., and determining that the message contains the network information that it wants to request, that is, if the WiFi network that satisfies the requirement is found, STA1 may cancel the sending of the Probe request.
  • STA1 receives a Probe request sent by multiple other STAs before the time point t3, STA1 finds the network information identifiers of multiple STA requests after parsing the Probe requests, if found The union of the network information identifiers of the requests carried in the multiple Probe requests includes the network information identifiers to be requested by the STA1, and the STA1 may also delay sending the Probe request message and wait for the Probe response of the AP to respond to the STAs.
  • STA1 After receiving the Probe request of STA2 at time t2, STA1 does not receive the Probe response of the AP to STA2 before t5, but STA1 receives one or the AP sends to other STAs (non-STA2). If there are multiple Probe responses, and it contains the network information that STA1 itself wants to request, STA1 cancels the sending of the Probe request message.
  • STA1 still needs to be at t3.
  • STA1 does not receive the Probe request of STA2 during the (t3-tl) channel listening period, but STA1 receives other messages that can be used for network discovery, if it contains the network information that STA1 itself wants to request, STA1 cancels Send the Probe request, otherwise, STA1 still needs to send the Probe request before the t3 time.
  • the network when the station needs to perform wireless network discovery, the network does not directly send a network probe request message through the channel to perform active detection of the wireless network, but firstly listens to the current channel to determine whether the current channel is received.
  • a network probe request message sent to another station when it is found that the network probe request message sent by another station is received on the current channel, the network probe request message sent by the station due to network discovery is reduced by delaying the sending of the network probe request message. Therefore, the probe response message generated by the network probe request message is reduced, and the channel use efficiency is improved.
  • the present invention further provides a site embodiment, as shown in FIG. 3, which may specifically include:
  • the intercepting module 301 is configured to: when the first network probe request message is sent to the access point, the current channel is intercepted, and when the current network receives the second network probe request message sent by the other station, triggering the message Delay module
  • the message delay module 302 is configured to delay sending the first network probe request message.
  • the network probe request message is not directly sent through the channel to perform active detection of the wireless network, but firstly
  • the listening module listens to the current channel, determines whether the current channel receives the network probe request message sent by other stations, and when it finds that the current channel receives the network probe request message sent by other stations, uses the delay module to transmit the network through the delay module.
  • the method of detecting the request message reduces the network probe request message sent by the station due to the network discovery, thereby reducing the probe response message generated by the network probe request message, and improving the channel use efficiency.
  • the message delay module 302 includes:
  • a first message determining submodule 3021 configured to determine whether the second network probe request message includes a network information identifier that is to be requested by itself
  • the probe response message waiting sub-module 3022 is configured to: when the first message determining sub-module 3021 determines that the second network probe request message includes information to be requested by itself, receiving the second network probe request message
  • the first network probe request message is temporarily not sent within a preset preset time, and waits for receiving a second probe response message sent by the neighboring wireless network access point.
  • the foregoing apparatus may further include: a second message determining submodule 3031, configured to receive the second probe response message if the preset time Or other information for the wireless network discovery, determining whether the second probe response message or other message for wireless network discovery includes network information to be requested by the wireless network, wherein the message for wireless network discovery includes : beacon message;
  • a message cancellation sub-module 3032 configured to: when the second probe response message or other message for wireless network discovery includes network information that is to be requested by itself, after the preset time is reached, the message is not sent.
  • the first network probe request message is not sent.
  • the device may further include: a message sending module 304, configured to: if the second probe response message is received within the preset time, not received The message for the wireless network discovery, and determining that the second network probe request message does not include the network information identifier that is to be requested by the second network probe request message, and sending the first network probe request message after the preset time is reached. .
  • a message sending module 304 configured to: if the second probe response message is received within the preset time, not received The message for the wireless network discovery, and determining that the second network probe request message does not include the network information identifier that is to be requested by the second network probe request message, and sending the first network probe request message after the preset time is reached.
  • the foregoing message sending module may be further configured to: if the second probe response message is not received within the preset time, and the message for wireless network discovery is not received, then the After the preset time, the first network probe request message is sent.
  • the description is relatively simple, and the relevant parts can be referred to the description of the method embodiment.
  • the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, ie may be located One place, or it can be distributed to multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without any creative effort.
  • the program when executed, may include the flow of an embodiment of the methods described above.
  • the storage medium may be a magnetic disk, an optical disk, or a read-only storage memory.

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  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

本发明实施例公开了一种无线网络的发现方法和站点,其中,所述方法包括:站点在向接入点发送第一网络探测请求消息之前,对当前信道进行侦听;当所述站点在所述当前信道接收到其它站点发送的第二网络探测请求消息时,所述站点延迟发送所述第一网络探测请求消息。通过本发明实施例,能够实现在无线网络发现阶段,减少STA因进行网络发现而发送的大量网络探测请求消息,并同时减少由网络探测请求消息所产生的探测响应消息,提高信道使用效率。

Description

一种无线网络的发现方法及装置 本申请要求于 2012 年 4 月 25 日提交中国专利局、 申请号为 201210123899.7 , 以及 2012 年 4 月 25 日提交中国专利局、 申请号为 201210213398.8 的中国专利申请优先权, 其全部内容通过引用包含于本申 请中。 技术领域 本发明涉及无线通信技术领域, 更具体地说, 涉及一种无线网络的发 现方法及装置。 背景技术
现有 WiFi ( Wireless Fidelity, 无线保真)技术中, 针对大量 WiFi STA ( station, 站点) 同时进入 WiFi AP ( access point, 接入点)覆盖区 i或的应 用场景,相应 STA与 AP建立连接之前,首先需要确定周边存在哪些对应 WiFi 网络的 WiFi AP, 并从这些 WiFi AP中选择满足自身要求的 WiFi AP, 然后执 行与相应 WiFi AP所属 WiFi网络的连接过程。
按照现有规范, WiFi STA除可以通过接收 AP周期性广播发送的信标 ( Beacon )消息发现 AP外,还可以通过发送主动扫描消息的方式发现网络。 如果一个 WiFi STA需要尽快发现周边存在的 WiFi AP, WiFi STA可以广播 网络探测请求消息( Probe request ) , 并在网络探测请求消息中携带所请求 的一个或多个 WiFi网络即 WiFi AP的相关信息对应的信息标识 ,该 WiFi STA 邻近区域内接收到该 Probe request的一个或多个 AP将向 STA回复探测响应 消息( Probe response ) , 并在探测响应消息中包含 STA所请求的 WiFi AP的 相关信息。
现有技术中, 每个 STA在广播 Probe request时, 需要逐个扫描自身支持 的多个信道, 通过每一个信道发送 Probe request, 并等待接收邻近区域内一 个或多个 AP响应产生的 Probe response。可见,每个 Probe request将导致邻近 区域的多个 AP进行响应,从而产生多个 Probe response。 因此,对于大量 STA 几乎同一时间进行网络发现的场景,在网络发现阶段, STA的每个信道将有 大部分时间用于传输网络发现消息 Probe request及 Probe response。 由此可见, 对于大量 STA同时等待入网的应用场景, 现有的 WiFi网络 发现机制将导致大量的 Probe request/response消息占用 STA与 AP使用的通 讯信道, 大大降低了信道的使用效率。 发明内容
有鉴于此, 本发明实施例提供一种无线网络的发现方法及装置, 以实 现在无线网络发现阶段,减少 STA因进行网络发现而发送的大量网络探测请 求消息, 并同时减少由网络探测请求消息所产生的探测响应消息, 提高信 道使用效率。
本发明实施例提供一种无线网络的发现方法, 包括:
站点在向接入点发送第一网络探测请求消息之前, 对当前信道进行侦 听;
当所述站点在所述当前信道接收到其它站点发送的第二网络探测请求 消息时, 所述站点延迟发送所述第一网络探测请求消息,或者, 所述站点取 消发送所述第一网络探测请求消息。
本发明实施例还提供一种站点, 包括:
侦听模块, 用于在向接入点发送第一网络探测请求消息之前, 对当前 信道进行侦听, 当在所述当前信道接收到其它站点发送的第二网络探测请 求消息时, 触发消息延迟模块;
消息延迟模块, 用于延迟发送所述第一网络探测请求消息;
消息取消子模块, 用于取消发送所述第一网络探测请求消息。
同现有技术相比, 本发明实施例中站点在需要进行无线网络发现时, 并非直接通过信道发送网络探测请求消息进行无线网络的主动探测, 而是 首先对当前信道进行侦听, 确定当前信道是否接收到其它站点发送的网络 探测请求消息, 当发现当前信道接收到其它站点发送的网络探测请求消息 时, 通过延迟发送网络探测请求消息的方式, 减少站点因进行网络发现而 发送的网络探测请求消息, 从而减少由网络探测请求消息所产生的探测响 应消息, 提高信道使用效率。 附图说明 为了更清楚地说明本发明实施例的技术方案, 下面将对实施例或现有 技术描述中所需要使用的附图作简单地介绍, 显而易见地, 下面描述中的 附图仅仅是本发明的一些实施例, 对于本领域普通技术人员来讲, 在不付 出创造性劳动的前提下, 还可以根据这些附图获得其他的附图。
图 1为本发明实施例提供的无线网络的发现方法流程示意图; 图; ' 、 ' 、 ' 八 、 u ' 、 、: 图 3为本发明实施例提供的一种站点的结构示意图;
图 4为图 3中消息延迟模块的结构示意图;
图 5为本发明实施例提供的另一种站点的结构示意图;
图 6为本发明实施例提供的又一种站点的结构示意图。 具体实施方式
下面将结合本发明实施例中的附图, 对本发明实施例中的技术方案进 行清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而不是全部的实施例。 基于本发明中的实施例, 本领域普通技术人员在没 有做出创造性劳动前提下所获得的所有其他实施例, 都属于本发明保护的 范围。
本发明实施例提供了一种无线网络的发现方法及装置, 以实现在无线 网络发现阶段, 减少 STA因进行网络发现而发送的大量网络探测请求消息, 并同时减少由网络探测请求消息所产生的探测响应消息, 提高信道使用效 率。
为了便于对本发明实施例技术方案的充分理解, 下面将结合本发明实 施例中的附图, 对本发明实施例中的技术方案进行清楚、 完整的描述。
首先, 对本发明实施例提供的无线网络的发现方法进行如下说明。 如图 1 所示, 为本发明实施例提供的无线网络的发现方法的流程, 具 体包括以下步骤:
步骤 101、站点在向接入点发送第一网络探测请求消息之前,对当前信 道进行侦听;
步骤 102、当所述站点在所述当前信道接收到其它站点发送的第二网络 探测请求消息时, 所述站点延迟发送所述第一网络探测请求消息。
此处, 所述第一网络探测请求消息特指当前站点发送的网络探测请求 消息, 所述第二网络探测请求消息特指其它一个或多个站点发送的网络探 测请求消息。
本发明实施例中, 站点在需要进行无线网络发现时, 并非直接通过信 道发送网络探测请求消息进行无线网络的主动探测, 而是首先对当前信道 进行侦听, 确定当前信道是否接收到其它站点发送的网络探测请求消息, 当发现在当前信道接收到其它站点发送的网络探测请求消息时, 通过延迟 发送网络探测请求消息的方式, 减少站点因进行网络发现而发送的网络探 测请求消息, 从而减少由网络探测请求消息所产生的探测响应消息, 提高 信道使用效率。
需要说明的是, 在本发明的一个优选实施例中, 所述站点延迟发送所 述第一网络探测请求消息的实现方式指: 所述站点在当前信道接收到一个 或多个其它站点发送的第二网络探测请求消息, 当所述站点确定所述第二 网络探测请求消息中包含了自身所要请求的网络信息标识时, 则从接收到 所述第二网络探测请求消息开始的预设时间内暂不发送所述第一网络探测 请求消息, 并等待接收周边无线网络接入点发送的第二探测响应消息。
此处, 所述预设时间是指周边无线网络接入点在接收到某站点发送的 网络探测请求消息之后, 向该站点发送探测响应消息所需的最长时间。 具 体实施时, 上述时间值可以由无线网络接入点自身进行设置; 或者, 由发 送网络探测请求消息的站点进行设置, 并将相应时间值携带于网络探测请 求中。
此外, 在本发明的另一个优选实施例中, 所述站点延迟发送所述第一 网络探测请求消息之后, 还可以包括:
如果所述站点从接收到所述其它站点发送的所述第二网络探测请求消 息开始的预设时间内, 接收到周边无线接入点发送的第二探测响应消息或 其它用于无线网络发现的消息, 且确定所述第二探测响应消息或其它用于 无线网络发现的消息中包含自身要请求的网络信息, 则在到达上述预设时 间后, 不再发送所述第一网络探测请求消息。 其中, 所述用于无线网络发 现的消息由周边无线网络接入点发送, 其中包含携带站点所需的无线网络 信息的消息, 此类消息包括: 信标消息 (beacon )等。 当然, 本发明技术方案在具体实施时, 仍存在一些需要站点发送网络 探测请求消息的应用场景。 这些应用场景例如: 如果上述预设时间内, 站 点确定其所接收到的其它站点发送的一个或多个第二网络探测请求消息中 未包含自身所要请求的网络信息标识, 并且, 未接收到其它用于无线网络 发现的消息时, 则在到达所述预设时间后, 仍需发送所述第一网络探测请 求消息。
此外, 所述站点在上述预设时间内未接收到周边无线网络接入点发送 的所述第二探测响应消息, 且未接收到所述用于无线网络发现的消息, 则 在到达所述预设时间后, 仍需要发送所述第一网络探测请求消息。
上述发明实施例中, 要进行网络发现的站点, 在发送网络探测请求消 息之前, 需要侦听信道上是否有其他站点发送的网络探测请求消息。 根据 现有的规范, 站点就需要对接收到的每个物理层帧进行解析并获得物理层 帧中包含的 MAC ( Media Access Control, 介质访问控制)层帧, 并通过 MAC层帧头中的帧类型信息确定当前 MAC帧是否为网络探测请求消息, 然而, 现有的实现方式可能导致站点消耗更多的电量。 为了减少站点对非 网络探测请求消息的解析操作, 本发明实施例提供了如下的解决方案: 站 点在发送的消息的物理帧的头部增加指示信息, 该指示信息用于指示当前 消息为网络探测请求消息。 具体的, 该指示信息用于指示该物理层帧的数 据部分是否包含了 MAC层的 Probe request。 实际应用中, 该指示信息可以 占用物理帧头部的一个或多个 Bit位,通过确定的取值来指示该物理帧的数 据部分是否包含 MAC层的 Probe request„ 这样, 站点只需要解析每个物理 层帧的帧头部分, 就可以根据其包含的指示信息得知该物理层帧是否包含 Probe request, 从而避免为了获得包含的 MAC层帧内容类型, 而进一步去 解析物理层帧的数据部分的操作, 减少站点的电量消耗。 当然, 如果站点 在通过一个物理层帧的帧头部分的指示信息, 确定该物理层帧的数据部分 包含一个 MAC层的 Probe request帧后,需要获得该 Probe request帧中包含 的请求信息内容, 则仍然需要进一步解析该物理层帧的数据部分, 以便得 到 MAC层帧中包含的请求信息。 为了便于对本发明技术方案的理解, 下面通过具体的实例对整体方案 进行详细的介绍说明。
如图 2所示, 为两站点进行无线网络发现的应用场景示意图。 其中, AP为接入点, STA1、 STA2为 AP覆盖区域内进行网络发现的两个站点。
STA1为了尽快发现 AP对应的 WiFi网络, 被触发对 WiFi网络进行主动扫 描。具体过程为: 由站点管理实体(SME )通过扫描请求消息(Scan request ) 触发 MAC层发送网络探测请求消息 Probe request, 站点管理实体在 Scan request消息中携带 probe delay参数, 指示 MAC层在发送主动扫描消息 Probe request之前需要先等待 probe delay指定的时间段。 另外, 根据 WiFi 规范中的信道竟争机制, 每个 STA在使用信道发送消息之前需要先监听信 道是否空闲, 并在发现信道空闲时启动退避时间窗口, 并在退避时间窗口 内继续监听信道, 如果直到退避时间窗口结束, 信道仍然空闲则发送 Probe request„
本实施例中, 假定 STA1在 tl时间点由站点管理实体发起扫描请求, 其中, Scan request中携带的 Probe delay参数指定的时间与退避时间共为 t3-tl , 此处, 退避时间相对于 Probe delay参数指定的时间可忽略不计。 也 就是说, STA1将在 t3时间点发送 Probe request。 此外, STA在发送 Probe request时, 通常会在 Probe request中携带自己请求的一个或多个网络信息 标识。
为了减少网络发现阶段大量 STA发送的 Probe request消息, 以及由此 导致的更多的 probe response, 该应用场景下, 如果将要进行主动网络扫描 的 STA1在( t3-tl )信道监听时间段接收到了其它 STA (如 STA2)发送的 Probe request (假定期间没有接收到其它可被用于网络发现的消息),如图 2所示, 假定 STA1在 t2时间点接收到了 STA2发送的 Probe request, STA1可进一 步对该 Probe request消息进行解析, 获得 STA2在其中携带的请求的信息, 并判断 STA2请求的网络信息标识中是否包含了 STA1自身要请求的网络信 息标识,如果是,则 STA1延迟发送 Probe request消息,等待接收 AP向 STA2 响应的 Probe response消息; 如果否, 则 STA1需要继续在 t3时间点之前发 送 Probe request消息。 本实施例中假设 STA1在 t4时间点接收到了 AP向 STA2发送的 Probe response, 这样可以减少网络发现阶段的 STA1发送的 probe request消息, 以及由此导致的 AP向 STA1发送的 probe response。 才艮 据现有机制, 对于 STA发送的 probe request, AP需要在预设时间内响应发 送 probe response, 本实施例中, 该预设时间为 ( t5-t2 )。 那么, 如果 STA1 在 AP指定的响应 probe response的时间内 ( t5之前 ), 一直没有接 4丈到 AP 响应 STA2的 probe response, 而且, 并未接收到其它可被用于网络发现的 消息(如: 接入点 AP周期性广播的 Beacon消息、 AP主动发送或响应其他 STA 的 probe response 消息等), 则 STA1 仍然需要竟争信道发送 Probe request„
需要说明的是, 上述过程是假定 STA1在( t3-tl )信道监听时间段期间 没有接收到其它可被用于网络发现的消息 (如接入点 AP 周期性广播的 Beacon消息、 AP主动发送或响应其他 STA的 probe response消息等), 但 如果在信道监听时间段接收到了其它可被用于网络发现的消息, 如接入点 AP 周期性广播的 Beacon 消息、 AP 主动发送或响应其他 STA 的 probe response消息等, 并确定该消息中包含自身要请求的网络信息, 即发现了满 足需求的 WiFi网络, 则 STA1可取消发送 Probe request。
需要进一步说明的是, 上述应用场景下, 如果 STA1在 t3时间点之前 接收到多个其它 STA发送的 Probe request,则 STA1在解析该些 Probe request 获得多个 STA请求的网络信息标识后, 如果发现该多个 Probe request中携 带的请求的网络信息标识的并集包含了 STA1 要请求的网络信息标识, 则 STA1也可以延迟发送 Probe request消息,等待 AP向该些 STA响应的 Probe response。还需要说明的是, STA1在 t2时间点接收到 STA2的 Probe request 后, 如果在 t5之前未接收到 AP向 STA2响应的 Probe response, 但 STA1 接收到了 AP向其它 STA (非 STA2 )发送的一个或多个 Probe response, 而 且其中包含了 STA1自身要请求的网络信息,则 STA1取消发送 Probe request 消息。
当然, 上述应用场景下, 如果 STA1在(t3-tl )信道监听时间段期间没 有接收到 STA2的 Probe request, 而且 STA1也没有接收到其它可被用于网 络发现的消息, 则 STA1仍需要在 t3时间点之前发送 Probe request。 此外, 如果 STA1在(t3-tl )信道监听时间段期间没有接收到 STA2的 Probe request, 但是 STA1接收到其它可被用于网络发现的消息,如果其中包含了 STA1 自 身要请求的网络信息, 则 STA1取消发送 Probe request, 否则, STA1仍需 要在 t3时间点之前发送 Probe request。
由此可见, 上述实施例中, 站点在需要进行无线网络发现时, 并非直 接通过信道发送网络探测请求消息进行无线网络的主动探测, 而是首先对 当前信道进行侦听, 确定在当前信道是否接收到其它站点发送的网络探测 请求消息, 当发现在当前信道接收到其它站点发送的网络探测请求消息时, 通过延迟发送网络探测请求消息的方式, 减少站点因进行网络发现而发送 的网络探测请求消息, 从而减少由网络探测请求消息所产生的探测响应消 息, 提高信道使用效率。 相应上述方法实施例, 本发明还提供了一种站点实施例, 如图 3所示, 具体可以包括:
侦听模块 301 , 用于在向接入点发送第一网络探测请求消息之前,对当 前信道进行侦听, 当在所述当前信道接收到其它站点发送的第二网络探测 请求消息时, 触发消息延迟模块;
消息延迟模块 302, 用于延迟发送所述第一网络探测请求消息; 实施例中, 站点进行无线网络发现时, 并非直接通过信道发送网络探 测请求消息进行无线网络的主动探测, 而是首先通过侦听模块对当前信道 进行侦听, 确定当前信道是否接收到其它站点发送的网络探测请求消息, 当发现当前信道接收到其它站点发送的网络探测请求消息时, 通过消息延 迟模块, 釆用延迟发送网络探测请求消息的方式, 减少站点因进行网络发 现而发送的网络探测请求消息, 从而减少由网络探测请求消息所产生的探 测响应消息, 提高信道使用效率。
在本发明的一个优选实施例中, 如图 4 所示, 上述消息延迟模块 302 包括:
第一消息确定子模块 3021 , 用于确定所述第二网络探测请求消息中是 否包含自身所要请求的网络信息标识; 探测响应消息等待子模块 3022, 用于当所述第一消息确定子模块 3021 确定所述第二网络探测请求消息中包含自身所要请求的信息时, 则从接收 到所述第二网络探测请求消息开始的预设时间内暂不发送所述第一网络探 测请求消息, 并等待接收周边无线网络接入点发送的第二探测响应消息。
在本发明的另一个优选实施例中, 如图 5所示, 上述装置还可以包括: 第二消息确定子模块 3031 , 用于如果所述预设时间内, 接收到所述第 二探测响应消息或其它用于无线网络发现的消息, 则确定所述第二探测响 应消息或其它用于无线网络发现的消息中是否包含自身要请求的网络信 息, 其中, 所述用于无线网络发现的消息包括: 信标消息;
消息取消子模块 3032, 用于当所述第二探测响应消息或其它用于无线 网络发现的消息中包含自身要请求的网络信息时, 则在到达所述预设时间 后, 不再发送所述第一网络探测请求消息。
在另一种站点实施例中, 如图 6所示, 该装置具体还可以包括: 消息发送模块 304, 用于如果所述预设时间内,接收到所述第二探测响 应消息, 未接收到所述用于无线网络发现的消息, 且确定所述第二网络探 测请求消息中未包含自身所要请求的网络信息标识, 则在到达所述预设时 间后, 发送所述第一网络探测请求消息。
进一步, 上述消息发送模块还可以用于: 如果所述预设时间内, 未接 收到所述第二探测响应消息, 且未接收到所述用于无线网络发现的消息时, 则在到达所述预设时间后, 发送所述第一网络探测请求消息。 对于装置实施例而言, 由于其基本相应于方法实施例, 所以描述得比 较简单, 相关之处参见方法实施例的部分说明即可。 以上所描述的装置实 施例仅仅是示意性的, 其中所述作为分离部件说明的单元可以是或者也可 以不是物理上分开的, 作为单元显示的部件可以是或者也可以不是物理单 元, 即可以位于一个地方, 或者也可以分布到多个网络单元上。 可以根据 实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。 本 领域普通技术人员在不付出创造性劳动的情况下, 即可以理解并实施。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流 程, 是可以通过计算机程序来指令相关的硬件来完成, 所述的程序可存储 于计算机可读取存储介质中, 该程序在执行时, 可包括如上述各方法的实 施例的流程。 其中, 所述的存储介质可为磁碟、 光盘、 只读存储记忆体
RAM )等。
对所公开的实施例的上述说明, 使本领域专业技术人员能够实现或使 用本发明。 对这些实施例的多种修改对本领域的专业技术人员来说将是显 而易见的, 本文中所定义的一般原理可以在不脱离本发明实施例的精神或 范围的情况下, 在其它实施例中实现。 因此, 本发明实施例将不会被限制 于本文所示的这些实施例, 而是要符合与本文所公开的原理和新颖特点相 一致的最宽的范围。

Claims

权利要求
1、 一种无线网络的发现方法, 其特征在于, 包括:
站点在向接入点发送第一网络探测请求消息之前, 对当前信道进行侦 听;
当所述站点在所述当前信道接收到其它站点发送的第二网络探测请求 消息时, 所述站点延迟发送所述第一网络探测请求消息。
2、 根据权利要求 1所述的无线网络的发现方法, 其特征在于, 所述站 点延迟发送所述第一网络探测请求消息, 包括:
当所述站点确定所述第二网络探测请求消息中包含了自身所要请求的 网络信息标识时, 则从接收到所述第二网络探测请求消息开始的预设时间 内暂不发送所述第一网络探测请求消息, 并等待接收周边无线网络接入点 发送的第二探测响应消息。
3、根据权利要求 2所述的无线网络的发现方法,其特征在于,还包括: 如果所述预设时间内, 所述站点接收到所述第二探测响应消息或其它 用于无线网络发现的消息, 且确定所述第二探测响应消息或其它用于无线 网络发现的消息中包含自身要请求的网络信息,
则在到达所述预设时间后, 不再发送所述第一网络探测请求消息, 其 中, 所述用于无线网络发现的消息包括: 信标消息。
4、 根据权利要求 2或 3所述的无线网络的发现方法, 其特征在于, 还 包括:
如果所述预设时间内, 所述站点接收到所述第二探测响应消息, 未接 收到所述用于无线网络发现的消息, 且所述站点确定所述第二网络探测请 求消息中未包含自身所要请求的网络信息标识,
则在到达所述预设时间后, 发送所述第一网络探测请求消息。
5、 根据权利要求 2至 4中任一项所述的无线网络的发现方法, 其特征 在于, 还包括:
如果所述预设时间内, 所述站点未接收到所述第二探测响应消息, 且 未接收到所述用于无线网络发现的消息,
则在到达所述预设时间后, 发送所述第一网络探测请求消息。
6、 根据权利要求 1-5中任一项所述的无线网络的发现方法, 其特征在 于, 还包括:
所述站点根据其它站点发送的消息的物理帧头中携带的指示信息, 确 定所述其它站点发送的消息为第二网络探测请求消息, 其中, 所述指示信 息用于指示当前消息为第二网络探测请求消息。
7、 一种站点, 其特征在于, 包括:
侦听模块, 用于在向接入点发送第一网络探测请求消息之前, 对当前 信道进行侦听, 当在所述当前信道接收到其它站点发送的第二网络探测请 求消息时, 触发消息延迟模块;
消息延迟模块, 用于延迟发送所述第一网络探测请求消息。
8、根据权利要求 7所述的站点, 其特征在于, 所述消息延迟模块包括: 第一消息确定子模块, 用于确定所述第二网络探测请求消息中是否包 含自身所要请求的网络信息标识;
探测响应消息等待子模块, 用于当所述第一消息确定子模块确定所述 第二网络探测请求消息中包含自身所要请求的信息时, 则从接收到所述第 二网络探测请求消息开始的预设时间内暂不发送所述第一网络探测请求消 息, 并等待接收周边无线网络接入点发送的第二探测响应消息。
9、 根据权利要求 8所述的站点, 其特征在于, 还包括:
第二消息确定子模块, 用于如果所述预设时间内, 接收到所述第二探 测响应消息或其它用于无线网络发现的消息, 则确定所述第二探测响应消 息或其它用于无线网络发现的消息中是否包含自身要请求的网络信息, 其 中, 所述用于无线网络发现的消息包括: 信标消息;
消息取消子模块, 用于当所述第二探测响应消息或其它用于无线网络 发现的消息中包含自身要请求的网络信息时, 则在到达所述预设时间后, 不再发送所述第一网络探测请求消息。
10、 根据权利要求 8或 9所述的站点, 其特征在于, 还包括: 消息发送模块, 用于如果所述预设时间内, 接收到所述第二探测响应 消息, 未接收到所述用于无线网络发现的消息, 且确定所述第二网络探测 请求消息中未包含自身所要请求的网络信息标识, 则在到达所述预设时间 后, 发送所述第一网络探测请求消息。
11、 根据权利要求 10所述的站点, 其特征在于, 所述消息发送模块还 用于:
如果所述预设时间内, 未接收到所述第二探测响应消息, 且未接收到 所述用于无线网络发现的消息时, 则在到达所述预设时间后, 发送所述第 一网络探测请求消息。
12、 一种无线网络的发现方法, 其特征在于, 包括:
站点在向接入点发送第一网络探测请求消息之前, 对当前信道进行侦 听;
当所述站点在所述当前信道接收到其它站点发送的第二网络探测请求 消息时, 所述站点延迟发送所述第一网络探测请求消息,或者, 所述站点取 消发送所述第一网络探测请求消息。
13、 根据权利要求 12所述的无线网络的发现方法, 其特征在于, 所述 站点延迟发送所述第一网络探测请求消息, 包括:
当所述站点确定所述第二网络探测请求消息中包含了自身所要请求的 网络信息标识时, 则从接收到所述第二网络探测请求消息开始的预设时间 内暂不发送所述第一网络探测请求消息, 并等待接收周边无线网络接入点 发送的第二探测响应消息。
14、 根据权利要求 12所述的无线网络的发现方法, 其特征在于, 所述 站点取消发送所述第一网络探测请求消息, 具体包括:
如果预设时间内, 所述站点接收到第二探测响应消息或其它用于无线 网络发现的消息, 且确定所述第二探测响应消息或其它用于无线网络发现 的消息中包含自身要请求的网络信息,
则在到达所述预设时间后, 不再发送所述第一网络探测请求消息, 其 中, 所述其他用于无线网络发现的消息包括: 信标消息。
15、 根据权利要求 13或 14所述的无线网络的发现方法, 其特征在于, 还包括:
如果所述预设时间内, 所述站点接收到所述第二探测响应消息, 未接 收到所述其他用于无线网络发现的消息, 且所述站点确定所述第二网络探 测请求消息中未包含自身所要请求的网络信息标识,
则在到达所述预设时间后, 发送所述第一网络探测请求消息。
16、 根据权利要求 13至 15中任一项所述的无线网络的发现方法, 其 特征在于, 还包括:
如果所述预设时间内, 所述站点未接收到所述第二探测响应消息, 且 未接收到所述其他用于无线网络发现的消息,
则在到达所述预设时间后, 发送所述第一网络探测请求消息。
17、 根据权利要求 14至 16任一项所述的无线网络的发现方法, 其特 征在于, 所述预设时间为从所述站点接收到所述第二网络探测请求消息开 始的预设时间, 所述第二探测响应消息由周边无线网络接入点发送。
18、根据权利要求 12-17中任一项所述的无线网络的发现方法,其特征 在于, 还包括:
所述站点根据其它站点发送的消息的物理帧头中携带的指示信息, 确 定所述其它站点发送的消息为第二网络探测请求消息, 其中, 所述指示信 息用于指示当前消息为第二网络探测请求消息。
19、 一种站点, 其特征在于, 包括:
侦听模块, 用于在向接入点发送第一网络探测请求消息之前, 对当前 信道进行侦听, 当在所述当前信道接收到其它站点发送的第二网络探测请 求消息时, 触发消息延迟模块;
消息延迟模块, 用于延迟发送所述第一网络探测请求消息;
消息取消子模块, 用于取消发送所述第一网络探测请求消息。
20、 根据权利要求 19所述的站点, 其特征在于, 所述消息延迟模块包 括:
第一消息确定子模块, 用于确定所述第二网络探测请求消息中是否包 含自身所要请求的网络信息标识;
探测响应消息等待子模块, 用于当所述第一消息确定子模块确定所述 第二网络探测请求消息中包含自身所要请求的信息时, 则从接收到所述第 二网络探测请求消息开始的预设时间内暂不发送所述第一网络探测请求消 息, 并等待接收周边无线网络接入点发送的第二探测响应消息。
21、 根据权利要求 19所述的站点, 其特征在于, 还包括:
第二消息确定子模块, 用于如果所述预设时间内, 接收到所述第二探 测响应消息或其它用于无线网络发现的消息, 则确定所述第二探测响应消 息或其它用于无线网络发现的消息中是否包含自身要请求的网络信息, 其 中, 所述用于无线网络发现的消息包括: 信标消息;
所述消息取消子模块, 具体用于当所述第二探测响应消息或其它用于 无线网络发现的消息中包含自身要请求的网络信息时, 则在到达所述预设 时间后, 不再发送所述第一网络探测请求消息。
22、 根据权利要求 19或 20所述的站点, 其特征在于, 还包括: 消息发送模块, 用于如果所述预设时间内, 接收到所述第二探测响应 消息, 未接收到所述其他用于无线网络发现的消息, 且确定所述第二网络 探测请求消息中未包含自身所要请求的网络信息标识, 则在到达所述预设 时间后, 发送所述第一网络探测请求消息。
23、 根据权利要求 22所述的站点, 其特征在于, 所述消息发送模块还 用于:
如果所述预设时间内, 未接收到所述第二探测响应消息, 且未接收到 所述其他用于无线网络发现的消息时, 则在到达所述预设时间后, 发送所 述第一网络探测请求消息。
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