CN103200685A - Feedback method initiatively scanning user terminal and access point - Google Patents

Feedback method initiatively scanning user terminal and access point Download PDF

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Publication number
CN103200685A
CN103200685A CN2012100047009A CN201210004700A CN103200685A CN 103200685 A CN103200685 A CN 103200685A CN 2012100047009 A CN2012100047009 A CN 2012100047009A CN 201210004700 A CN201210004700 A CN 201210004700A CN 103200685 A CN103200685 A CN 103200685A
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China
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user terminal
described
response message
sweep time
timer
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CN2012100047009A
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Chinese (zh)
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CN103200685B (en
Inventor
杨国瑞
姚宗明
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华为技术有限公司
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Priority to CN201210004700.9A priority Critical patent/CN103200685B/en
Priority claimed from CN201210143250.1A external-priority patent/CN103200646B/en
Publication of CN103200685A publication Critical patent/CN103200685A/en
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Abstract

The invention provides a feedback method initiatively scanning a user terminal and an access point, and relates to the field of communication. According to the feedback method initiatively scanning the user terminal and the access point, a timer can be arranged in the access point, cached tentative response message is deleted after the timer reaches to a preset time, and furthermore, expenditure in channel resource is reduced. The feedback method initiatively scanning the user terminal comprises the following steps that a tentative request message from the user terminal is received, wherein the tentative request message includes a scanning time preset by the user terminal; a tentative response message of the tentative request message is generated and cached; according to the received scanning time preset by the user terminal, the timer corresponding to the user terminal is set and started; after the facts that the timer reaches the preset scanning time and the tentative response message is not sent to the user terminal are judged, the cached tentative response message is deleted.

Description

A kind of feedback method and access point to the user terminal active scan

Technical field

The present invention relates to the communications field, relate in particular to a kind of feedback method to the user terminal active scan and access point.

Background technology

At WLAN (Wireless Local Area Networks, WLAN) in, Basic Service Set (Basic Service Set, BSS) be the element of WLAN, when user terminal need insert basic service set networks, need by scanning discovery basic service set networks and its access point (Access Point, AP).Scan method is divided into active scan and two kinds of patterns of drive sweep, wherein when the user terminal scan pattern that has the initiative, send probe request message by clean culture or broadcasting to access point at channel, in the regular hour, wait for then corresponding, by the probe response information that access point sends, initiatively find basic service set networks in this way and obtain the associated attribute of this basic service set networks.Comprise service set identifier (Service Set Identifier in the described probe request message that user terminal sends, SSID) and BSSID (Basic Service Set Identifier, BSSID), access point is after receiving this probe request message, namely feed back corresponding probe response message to user terminal if satisfy following condition: if described SSID be asterisk wildcard SSID or with extended service set (Extended Service Set, ESS) SSID is complementary, and described BSSID is asterisk wildcard BSSID or is the BSSID of access point.

Yet, in the prior art, when access point feeds back probe response message to user terminal, be not to send probe response message to user terminal at once, but described tentative messages is arranged in the transmit queue, obtain the chance that sends message by the mode of distributed contention then.But the time of user terminal wait-for-response is certain, after user terminal finishes this scan channel, because access point does not know that the user leaves, may still continue to send tentative messages to user terminal, causes the channel resource waste.

Summary of the invention

Embodiments of the invention provide a kind of feedback method to the user terminal active scan and access point, can be by timer be set in access point, after timer reaches Preset Time, remove the probe response information of buffer memory, further, reduced the expense of channel resource.

For achieving the above object, embodiments of the invention adopt following technical scheme:

On the one hand, the embodiment of the invention provides a kind of feedback method to the user terminal active scan, comprising:

Reception is from the probe request message of user terminal, and described probe request message comprises the sweep time that described user terminal is default;

Generation and buffer memory are to the probe response message of described probe request message;

The sweep time default according to the described user terminal that receives, arrange and open the timer corresponding to described user terminal;

Judging that described timer reaches described default sweep time, and after described probe response message is not sent to described user terminal, removing the described probe response message of buffer memory.

On the one hand, the embodiment of the invention provides a kind of access point, comprising:

Receiver is used for receiving the probe request message from user terminal, and described probe request message comprises the sweep time that described user terminal is default;

Buffer is used for generation and buffer memory to the probe response message of described probe request message;

Timer arranges the unit, is used for the sweep time default according to the described user terminal that receives, and arranges and open the timer corresponding to described user terminal;

Processor is used for when judging that described timer reaches described default sweep time, and after described probe request message is not sent to described user terminal, removes the described probe response message of buffer memory.

A kind of feedback method and access point to the user terminal active scan that the embodiment of the invention provides, by receiving from probe request message user terminal, that comprise the sweep time that user terminal is default, in generation and the probe response message of buffer memory to this probe request message, the sweep time default according to user terminal, arrange and open the timer corresponding to user terminal, and then, when judging that timer reaches default sweep time, and after probe request message is not sent to user terminal, remove the probe response message of buffer memory.By this scheme, access point can pass through to arrange the timer corresponding to user terminal, and after timer reaches Preset Time, cancellation is to user terminal transmission probe response message, remove the probe response information of buffer memory, further, reduced the expense of channel resource.

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

The feedback method schematic flow sheet one to the user terminal active scan that Fig. 1 provides for the embodiment of the invention;

The feedback method schematic flow sheet two to the user terminal active scan that Fig. 2 provides for the embodiment of the invention;

The access point that Fig. 3 provides for the embodiment of the invention.

Embodiment

In below describing, in order to illustrate rather than in order limiting, to have proposed the detail such as particular system structure, interface, technology, understand the present invention in order to cut thoroughly.Yet, not it will be clear to one skilled in the art that in having other embodiment of these details and can realize the present invention yet.In other situation, omit the detailed description to well-known device, circuit and method, in order to avoid unnecessary details hinders description of the invention.

The various technology of Miao Shuing can be used for various wireless communication systems herein, current 2G for example, 3G communication system and next generation communication system, global system for mobile communications for example, code division multiple access system, time-division multiple address system, Wideband Code Division Multiple Access (WCDMA), fdma system, orthogonal frequency division multiple access system, single-carrier system, General Packet Radio Service System, long evolving system, and other these type of communication systems.

In conjunction with terminal and/or base station and/or base station controller various aspects are described herein.

Subscriber equipment, can be that wireless terminal also can be catv terminal, wireless terminal can be to point to the equipment that the user provides voice and/or data connectivity, has the portable equipment of wireless connections function or is connected to other treatment facilities of radio modem.Wireless terminal can communicate through wireless access network and one or more core net, wireless terminal can be portable terminal, as mobile phone (or being called " honeycomb " phone) with have the computer of portable terminal, for example, can be portable, pocket, hand-hold type, mobile device built-in computer or vehicle-mounted, they and wireless access network exchange language and/or data.For example, equipment such as Personal Communications Services phone, cordless telephone, Session initiation Protocol phone, Wireless Local Loop way station, personal digital assistant.Wireless terminal also can be called system, subscriber unit, subscriber station, mobile radio station, travelling carriage, distant station, access point, remote terminal, access terminal, user terminal, user agent, subscriber equipment or subscriber's installation.

Base station (for example, access point) can refer in the Access Network on the interface aloft the equipment by one or more sectors and wireless terminal communications.Air frame and IP grouping that the base station can be used for receiving are changed mutually, and as the router between the remainder of wireless terminal and Access Network, wherein the remainder of Access Network can comprise Internet protocol (IP) network.The base station also tunable to the attribute management of air interface.

In addition, term " system " and " network " often are used interchangeably in this article herein.Herein term " and/or ", only be a kind of incidence relation of describing affiliated partner, can there be three kinds of relations in expression, for example, A and/or B, can represent: individualism A exists A and B, these three kinds of situations of individualism B simultaneously.In addition, character "/" herein, generally represent forward-backward correlation to as if a kind of " or " relation.

The embodiment of the invention provides a kind of feedback method to the user terminal active scan, and as shown in Figure 1, this method comprises:

S101, access point receive the probe request message from user terminal, and probe request message comprises the sweep time that user terminal is default.

In WLAN, BSS is the element of WLAN, when user terminal need insert basic service set networks, at first finds basic service set networks and its corresponding access point by scan mechanism, and this scene is referred to as AP detection.When user terminal starts AP detection, user terminal is at first at management entity (Station Management Entity, SME) generate scan request primitive, MAC layer management entity (MAC Layer Management Entity, MLME) receive described scan request primitive after, determine scan pattern and scans content according to the indication information of scan request primitive, for example, user terminal is active scan or drive sweep, and the channel list of user terminal scanning, and the minimum and maximum scan channel time etc.And then if scan pattern is set at aggressive mode, then the MLME of user terminal can send probe request message at the channel that described primitive is determined, the access point AP of beginning detection operations on this channel; If when having the described access point of work on this channel, then access point receives the probe request message from user terminal, the scan channel temporal information that can comprise user terminal in the described probe request message, particularly, the described remaining scan channel time of scan channel time indicating user terminal, can be the maximum channel sweep time of indicating in the described scan request primitive, this probe request message can also comprise SSID and BSSID.

Exemplary, the default information element that can be arranged on probe request message sweep time of user terminal (Information Element, IE) in, perhaps, the time domain field that also can be arranged on probe request message sweep time that user terminal is default.

S102, access point generation and buffer memory are to the probe response message of probe request message.

Access point need judge probe request message after the probe request message that receives from user terminal, particularly, can judge the SSID of probe request message and BSSID etc.If described SSID is asterisk wildcard SSID or is complementary with the SSID of ESS, and described BSSID is asterisk wildcard BSSID or is the BSSID of access point, access point can generate the probe response message corresponding to probe request message so, and with described probe response message be arranged in the transmit queue with etc. to be sent.Exemplary, this probe response message can be the probe response message of clean culture or multicast mode.

Access point can be opened the timer corresponding to this user terminal when judging that response condition is set up, described timer can arrange according to the sweep time of carrying in the probe request message.

The sweep time that S103, access point are preset according to the user terminal that receives, arrange and open the timer corresponding to user terminal.

Access point is in generation and the probe response message of buffer memory to probe request message, sweep time that can be default according to user terminal in the probe response message, arrange and open the timer corresponding to this user terminal, particularly, can use user terminal identification to accord with arranging timer corresponding to user terminal, further, the user terminal identification symbol can be MAC (Medium/Media Access Control, medium access control) address, and this timer can be the probe response timer.

S104, access point are judging that timer reaches default sweep time, and after probe response message is not sent to user terminal, remove the probe response message of buffer memory.

Timer picks up counting, and access point can judge that timer arrives default sweep time, and after the probe response message of buffer memory also is not sent to user terminal, removes the probe response message of buffer memory.

Exemplary, the timing mode of timer can have a lot, its initial value can be set to zero, and then employing increases progressively the mode of counting, when the clocking value of timer reaches user terminal default sweep time, and after probe response message is not sent to user terminal, remove the probe response message of buffer memory; Its initial value also can be set to user terminal default sweep time, and then adopts the mode of countdown, when the clocking value of timer exhausts, when namely clocking value is zero, and after probe response message is not sent to user terminal, removes the probe response message of buffer memory.

A kind of feedback method to the user terminal active scan that the embodiment of the invention provides, by receiving from probe request message user terminal, that comprise the sweep time that user terminal is default, in generation and the probe response message of buffer memory to this probe request message, the sweep time default according to user terminal, arrange and open the timer corresponding to user terminal, and then, when judging that timer reaches default sweep time, and after probe request message is not sent to user terminal, remove the probe response message of buffer memory.By this scheme, access point can pass through to arrange the timer corresponding to user terminal, and after timer reaches Preset Time, cancellation is to user terminal transmission probe response message, remove the probe response information of buffer memory, further, reduced the expense of channel resource.

The embodiment of the invention provides a kind of feedback method to the user terminal active scan, and as shown in Figure 2, this method comprises:

S201, user terminal send probe request message at channel, and this probe request message comprises the sweep time that user terminal is default, and open and sound out timer.

The sweep time that the user terminal that comprises in the probe request message that user terminal sends is default, can be used to indicate user terminal in maximum time that this channel scans, should can be default sweep time but be not limited to maximum channel sweep time, it also can be the time that user terminal sets in advance, should can in the information element of probe request message, indicate default sweep time, also can be in the time domain/id field indication of probe request message mac frame head, its position is not limit.

What need replenish is that when user terminal scanned this channel, the physical layer of user terminal can be intercepted this channel, if occur the message that other websites send on this channel, then can generate the primitive of channel busy; After user terminal is opened the exploration timer, when the clocking value of souning out timer reaches minimum channel during sweep time, if the physical layer of user terminal does not generate the primitive of channel busy, then mean the access point that does not have work on this channel, user terminal then finishes the scanning to this channel so, if the physical layer of user terminal has generated the primitive of channel busy, user terminal then continues this channel is scanned so.

S202, access point receive the probe request message from user terminal.

What need to replenish is, in the probe request message of user terminal, not only can comprise the sweep time that user terminal is default, can also comprise SSID and BSSID.

Wherein, SSID is service set, the SSID technology can be divided into a WLAN (wireless local area network) several sub-networks that need the different identity checking, each sub-network all needs independently authentication, have only the user terminal by authentication just can enter corresponding sub-network, prevent that uncommitted user from entering present networks.BSSID is BSSID, the MAC Address that refers to user terminal at an access point at an infrastructure mode BSS by the WLAN (wireless local area network) normalized definition.This zone has defined each BSS uniquely.

S203, access point generation and buffer memory are to the probe response message of described probe request message.

Access point can be judged probe request message after the probe request message that receives from user terminal, particularly, can judge SSID and the BSSID of probe request message.If being the SSID of asterisk wildcard SSID or this SSID and ESS, this SSID is complementary, and this BSSID is that asterisk wildcard BSSID or this BSSID are the BSSID of access point, access point can generate the probe response message to this probe request message so, and this probe response message of buffer memory, the buffer memory form can be for being arranged in the transmit queue particularly.Exemplary, the probe response message that this probe response message is clean culture or multicast.

The sweep time that S204, access point are preset according to the user terminal that receives, arrange and open the timer corresponding to user terminal.

Access point is in generation and the probe response message of buffer memory to probe request message, sweep time that can be default according to user terminal in the probe response message, arrange and open the timer corresponding to this user terminal, particularly, can use user terminal identification to accord with arranging timer corresponding to user terminal, further, the user terminal identification symbol can be MAC Address.

S205, access point are judging that timer reaches default sweep time, and after probe response message is not sent to user terminal, remove the probe response message of buffer memory.

Access point is followed distributed contention mechanism, send the probe response message in the transmit queue, reach the sweep time that user terminal is preset up to timer, timer picks up counting, if timer does not reach default sweep time, then be buffered in the transmit queue and sound out response message and wait for and be sent to user terminal, if access point is judging that timer arrives default sweep time, and after the probe response message of buffer memory also is not sent to user terminal, the access point cancellation sends probe response message to user terminal, and removes the probe response message of buffer memory.

For the exploration timer of user terminal, when reaching default sweep time, can be maximum channel sweep time this sweep time, and user terminal can be handled the probe response message that receives, and finish scan channel.

Exemplary, the timing mode of timer can have a lot, its initial value can be set to zero, and then employing increases progressively the mode of counting, when the clocking value of timer reaches user terminal default sweep time, and after probe response message is not sent to user terminal, remove the probe response message of buffer memory; Its initial value also can be set to user terminal default sweep time, and then adopts the mode of countdown, when the clocking value of timer exhausts, when namely clocking value is zero, and after probe response message is not sent to user terminal, removes the probe response message of buffer memory.

Same, the timing mode of souning out timer can have a lot, its initial value can be set to zero, and then employing increases progressively the mode of counting, when the clocking value of souning out timer reaches the sweep time that user terminal is preset, the probe response message that user terminal processes receives, and finish the scanning of this channel; Its initial value also can be set to user terminal default sweep time, and then adopts the mode of countdown, when the clocking value of souning out timer exhausts, and when namely clocking value is zero, the probe response message that user terminal processes receives, and finish the scanning of this channel.

A kind of feedback method to the user terminal active scan that the embodiment of the invention provides, by receiving from probe request message user terminal, that comprise the sweep time that user terminal is default, in generation and the probe response message of buffer memory to this probe request message, the sweep time default according to user terminal, arrange and open the timer corresponding to user terminal, and then, when judging that timer reaches default sweep time, and after probe request message is not sent to user terminal, remove the probe response message of buffer memory.By this scheme, access point can pass through to arrange the timer corresponding to user terminal, and after timer reaches Preset Time, cancellation is to user terminal transmission probe response message, remove the probe response information of buffer memory, further, reduced the expense of channel resource.

The embodiment of the invention provides a kind of access point 1, as shown in Figure 3, comprising:

Receiver 10 is used for receiving the probe request message from user terminal, and described probe request message comprises the sweep time that described user terminal is default;

Buffer 11 is used for generation and buffer memory to the probe response message of described probe request message;

Timer arranges unit 12, is used for the sweep time default according to the described user terminal that receives, and arranges and open the timer corresponding to described user terminal;

Processor 13 is used for when judging that described timer reaches described default sweep time, and after described probe request message is not sent to described user terminal, removes the described probe response message of buffer memory.

Further, user terminal default sweep time is maximum channel sweep time.

Further, the information element that is arranged on probe request message sweep time that user terminal is default, or the default time domain field that is arranged on probe request message sweep time of user terminal.

Further, probe response message is the probe response message of clean culture or multicast.

Further, timer arranges unit 12 and specifically is used for, use the setting of user terminal identification symbol corresponding to the described timer of described user terminal, the initial value of described timer is set to described default sweep time, and the timing mode of described timer is set to the timing of successively decreasing, particularly, the user terminal identification symbol can be MAC Address.

Further, processor 13 concrete being used for exhausts at the clocking value of judging described timer, and after described probe response message is not sent to described user terminal, removes the described probe response message of buffer memory.

A kind of access point that the embodiment of the invention provides, by receiving from probe request message user terminal, that comprise the sweep time that user terminal is default, in generation and the probe response message of buffer memory to this probe request message, the sweep time default according to user terminal, arrange and open the timer corresponding to user terminal, and then, when judging that timer reaches default sweep time, and after probe request message is not sent to user terminal, remove the probe response message of buffer memory.By this scheme, access point can pass through to arrange the timer corresponding to user terminal, and after timer reaches Preset Time, cancellation is to user terminal transmission probe response message, remove the probe response information of buffer memory, further, reduced the expense of channel resource.

The those skilled in the art can be well understood to, be the convenience described and succinct, only the division with above-mentioned each functional module is illustrated, in the practical application, can as required the above-mentioned functions distribution be finished by different functional modules, the internal structure that is about to device is divided into different functional modules, to finish all or part of function described above.The system of foregoing description, the concrete course of work of device and unit can not repeat them here with reference to the corresponding process among the preceding method embodiment.

In several embodiment that the application provides, should be understood that, disclosed system, apparatus and method can realize by other mode.For example, device embodiment described above only is schematic, for example, the division of described module or unit, only be that a kind of logic function is divided, during actual the realization other dividing mode can be arranged, for example a plurality of unit or assembly can in conjunction with or can be integrated into another system, or some features can ignore, or do not carry out.Another point, the shown or coupling each other discussed or directly to be coupled or to communicate to connect can be by some interfaces, the indirect coupling of device or unit or communicate to connect can be electrically, machinery or other form.

Described unit as separating component explanation can or can not be physically to separate also, and the parts that show as the unit can be or can not be physical locations also, namely can be positioned at a place, perhaps also can be distributed on a plurality of network element.Can select wherein some or all of unit to realize the purpose of present embodiment scheme according to the actual needs.

In addition, each functional unit in each embodiment of the present invention can be integrated in the processing unit, also can be that the independent physics in each unit exists, and also can be integrated in the unit two or more unit.Above-mentioned integrated unit both can adopt the form of hardware to realize, also can adopt the form of SFU software functional unit to realize.

If described integrated unit is realized with the form of SFU software functional unit and during as independently production marketing or use, can be stored in the computer read/write memory medium.Based on such understanding, part or all or part of of this technical scheme that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprise that some instructions are with so that a computer equipment (can be personal computer, server, the perhaps network equipment etc.) or processor (processor) carry out all or part of step of the described method of each embodiment of the present invention.And aforesaid storage medium comprises: various media that can be program code stored such as USB flash disk, portable hard drive, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD.

The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.

Claims (14)

1. the feedback method to the user terminal active scan is characterized in that, comprising:
Reception is from the probe request message of user terminal, and described probe request message comprises the sweep time that described user terminal is default;
Generation and buffer memory are to the probe response message of described probe request message;
The sweep time default according to the described user terminal that receives, arrange and open the timer corresponding to described user terminal;
Judging that described timer reaches described default sweep time, and after described probe response message is not sent to described user terminal, removing the described probe response message of buffer memory.
2. the feedback method to the user terminal active scan according to claim 1 is characterized in that, be maximum channel sweep time the sweep time that described user terminal is preset.
3. the feedback method to the user terminal active scan according to claim 1, it is characterized in that, described user terminal is arranged in the information element of described probe request message default sweep time, or the default time domain field that is arranged on described probe request message sweep time of described user terminal.
4. the feedback method to the user terminal active scan according to claim 1 is characterized in that, the probe response message that described probe response message is clean culture or multicast.
5. the feedback method to the user terminal active scan according to claim 1 is characterized in that, arranges and open the timer corresponding to described user terminal the sweep time that the described user terminal that described basis receives is default, comprising:
Use the setting of user terminal identification symbol corresponding to the described timer of described user terminal, the initial value of described timer is set to described default sweep time, and the timing mode of described timer is set to the timing of successively decreasing.
6. the feedback method to the user terminal active scan according to claim 5 is characterized in that, described user terminal identification symbol is medium access control (MAC) address.
7. according to claim 1 or 4 described feedback methods to the user terminal active scan, it is characterized in that, judging that described timer reaches described default sweep time, and after described probe response message is not sent to described user terminal, remove the described probe response message of buffer memory, comprising:
Exhaust at the clocking value of judging described timer, and after described probe response message is not sent to described user terminal, remove the described probe response message of buffer memory.
8. an access point is characterized in that, comprising:
Receiver is used for receiving the probe request message from user terminal, and described probe request message comprises the sweep time that described user terminal is default;
Buffer is used for generation and buffer memory to the probe response message of described probe request message;
Timer arranges the unit, is used for the sweep time default according to the described user terminal that receives, and arranges and open the timer corresponding to described user terminal;
Processor is used for when judging that described timer reaches described default sweep time, and after described probe request message is not sent to described user terminal, removes the described probe response message of buffer memory.
9. access point according to claim 8 is characterized in that, be maximum channel sweep time the sweep time that described user terminal is preset.
10. access point according to claim 8, it is characterized in that, the information element that is arranged on described probe request message sweep time that described user terminal is default, or the default time domain field that is arranged on described probe request message sweep time of described user terminal.
11. access point according to claim 8 is characterized in that, the probe response message that described probe response message is clean culture or multicast.
12. access point according to claim 8, it is characterized in that, described timer arranges the unit and specifically is used for, use the setting of user terminal identification symbol corresponding to the described timer of described user terminal, the initial value of described timer is set to described default sweep time, and the timing mode of described timer is set to the timing of successively decreasing.
13. access point according to claim 12 is characterized in that, described user terminal identification symbol is medium access control (MAC) address.
14. according to Claim 8 or 12 described access points, it is characterized in that, described preparation implement body is used for exhausting at the clocking value of judging described timer, and after described probe response message is not sent to described user terminal, removes the described probe response message of buffer memory.
CN201210004700.9A 2012-01-09 2012-01-09 Feedback method initiatively scanning user terminal and access point CN103200685B (en)

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CN201210143250.1A CN103200646B (en) 2012-01-09 2012-01-09 A kind of method of terminal and terminal active scan
CN201210004700.9A CN103200685B (en) 2012-01-09 2012-01-09 Feedback method initiatively scanning user terminal and access point
CN201510831197.8A CN105376837B (en) 2012-01-09 2012-01-09 A kind of method of terminal and terminal active scan
PCT/CN2013/070024 WO2013104271A1 (en) 2012-01-09 2013-01-04 Feedback method for actively scanning user terminal and access point
US14/327,427 US9603082B2 (en) 2012-01-09 2014-07-09 Feedback method for active scanning of user terminal, and access point

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