CN101185291A - Enhanced scanning for access entities - Google Patents
Enhanced scanning for access entities Download PDFInfo
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- CN101185291A CN101185291A CNA2006800185938A CN200680018593A CN101185291A CN 101185291 A CN101185291 A CN 101185291A CN A2006800185938 A CNA2006800185938 A CN A2006800185938A CN 200680018593 A CN200680018593 A CN 200680018593A CN 101185291 A CN101185291 A CN 101185291A
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Abstract
The invention proposes a method for detecting an access entity in a network comprising the access entity and a device for wireless communication, wherein the detection is performed with respect to a changeable parameter, and for each specified parameter the following steps are performed: buffering data packets to be transmitted between the device for wireless communication and the access entity, performing the scan process, by the device for wireless communication, based on the specified parameter, and transmitting the buffered packets between the device for wireless communcation and the access entity. The invention also proposes a corresponding device for wireless communication.
Description
Technical field
The present invention relates to be used for method of wireless communication and equipment, can carry out inserting the scanning of entity with equipment by this method.
Background technology
The present invention relates to the network that the Wireless Telecom Equipment in the network can connect with one of some different access entities.An example is WLAN (WLAN), and wlan device wherein (being also referred to as workbench (STA)) can be connected to different access point (AP).In this situation, wlan device may be roamed between different AP.When roaming in wlan network, the user need carry out background active directed scan operation in order usually, in order to the available WLAN access point of finding to roam into.
In other words, when such wlan device was prepared roaming, it carried out initiatively direct scan of backstage usually, in order to find to belong to the available WLAN access point of same wlan network (having consolidated network title (SSID (service is provided with identifier))).A scan operation of being carried out by wlan device may spend about 1 second.
Scan operation both can be initiatively also can be passive.In active scan operation, explore frame (probe frame) is sent out and wait-for-response, and in the drive sweep operation, wlan device is monitored specific Frame, for example from the beacon frame of access point.
Active scan operation is shown in Figure 6.In each channel, carry out this operation.Especially, at wlan device (terminal also promptly) with operate between the access point on the frequency 1 and carry out transfer of data.Then, in order to carry out scan operation, frequency is adjusted to frequency 2.On this frequency, probe requests thereby is sent to wireless medium.Under the situation that the access point that runs on the frequency 2 can be used, this access point will be replied by probe response.Frequency 3 is repeated this process ..., up to reaching frequency N.
When carrying out scan operation, can not carry out the transmission and the reception of data M PDU (MAC (medium access control) protocol Data Unit), this will be to being similar to the directly influence of application generation that real-time requires that has of voice.
Summary of the invention
Therefore, the objective of the invention is to solve the above-mentioned problem, and in to the scanning process that inserts entity, minimize for delay with application that real-time requires.
This purpose is solved comprising the method that the network that inserts entity and Wireless Telecom Equipment detects this access entity by being used for, wherein said detection is carried out at transformable parameter, and carry out following steps: packet waiting for transmission between buffer memory Wireless Telecom Equipment and the access entity for each designated parameters, carry out scanning process by this Wireless Telecom Equipment based on this designated parameters, and the grouping that transmission is buffered between this Wireless Telecom Equipment and this access entity.
Selectively, this purpose is solved by being used to connect the Wireless Telecom Equipment that inserts entity, this Wireless Telecom Equipment comprises the checkout gear of the access entity that is used for detecting network, wherein said detection is carried out at transformable parameter, and this checkout gear is suitable for carrying out the following sequence of operation for each designated parameters: will insert the packet of entity transmission to this Wireless Telecom Equipment to inserting entity transmission indication from this with buffer memory, carry out scanning process based on this designated parameters, and receive the packet that is buffered from this access entity.
Therefore, according to the present invention, Frame is buffered (in inserting entity and/or Wireless Telecom Equipment), makes and can carry out scanning process at a designated parameters.After the scanning, the grouping that transmission is buffered.Parameter for example can be channel and/or frequency.In other words, the process above can carrying out at a channel makes and carries out scanning process at a channel, and after this, transmits the grouping that is buffered.After this, grouping is carried out scan operation by buffer memory once more and at one other channel.
Therefore, the delay that is caused by scanning is lowered to minimum.In other words, according to the present invention, the interference of data business is minimized.
Other favourable progress illustrates in the dependent claims.
Especially, Wireless Telecom Equipment can be connected on the specific access entity, and can insert entity at other and carry out described detection.In other words, in this example, when the roaming of Wireless Telecom Equipment, carry out and detect with corpse.
And parameter can comprise the sign of frequency and/or channel and/or ad hoc wireless networks.In other words, can carry out the aforesaid operations sequence at specific channel and/or specific wireless network identification (for example, SSID (service is provided with identifier)) at specific frequency.
After carrying out the buffer memory step, can carry out following steps: in specific access device, from the Wireless Telecom Equipment receiving data frames, this Frame comprises and indicates the indication that Frame will be buffered, and the Frame that will mail to this Wireless Telecom Equipment is by this specific access device buffer memory.Above-mentioned indication can be the power management bit that is set up.
In addition, receive from Wireless Telecom Equipment indicate the indication of finishing at the scanning process of designated parameter after, the grouping that is buffered can be sent to this Wireless Telecom Equipment.This indicates, and completed specific indication for example can be the reception of poll frame (Poll frame) at the scanning process of parameter, and this poll frame is the frame that power management bit is cleared.
Wireless Telecom Equipment itself has under the situation that will be sent to the frame that inserts entity in scanning process, and these frames can be buffered in this equipment, and after scanning process, these frames that are buffered can be sent to the access entity.
Scanning process can comprise the step that sends explore frame and wait-for-response.In other words, scanning process can be an active scan.
Selectively, scanning process can comprise the step of waiting for the reception particular frame.This for example can be a drive sweep, and wherein particular frame is the beacon frame from access point.
And network can be a wireless lan (wlan), and inserting entity can be access point (AP), and Wireless Telecom Equipment can be a wlan device.
In addition, detection can be activated after receiving from the request as Wireless Telecom Equipment host's main process equipment.
The checkout gear of Wireless Telecom Equipment can comprise control module, transceiver, antenna and memory.
The method according to this invention can be implemented as the computer program that is used for treatment facility, and this computer program comprises the software code part that is used to carry out steps of a method in accordance with the invention on treatment facility when this program is moved.This computer program can comprise the computer-readable medium (is readable for treatment facility) that stores the software code part on it.
Especially, treatment facility can be the part of wlan device, makes computer program can be stored in the memory of wlan device.
Description of drawings
The present invention will be described with reference to the accompanying drawings, wherein:
Fig. 1 shows the essential structure of the WLAN that comprises wlan device and some access points,
Fig. 2 shows the flow chart of the process of carrying out according to one embodiment of the present invention in wlan device,
Fig. 3 shows the flow chart of the process of carrying out according to the embodiment of the present invention in access point,
Fig. 4 has illustrated the WLAN host A PI framework that can use in embodiments of the present invention,
Fig. 5 shows terminal according to the embodiment of the present invention, and
Fig. 6 shows the signaling flow of carrying out scanning at a plurality of channels.
Embodiment
Hereinafter, preferred implementation of the present invention will be described with reference to the drawings.
According to this preferred implementation, the present invention is applied in the wireless lan (wlan) that for example has the structure of form as shown in Figure 1.Especially, wlan device 4 (as the example of Wireless Telecom Equipment) is connected with the first access point AP1 (as the example that inserts entity) by radio (radio), with reference number 1 expression AP1.In this situation, suppose that the user of wlan device is intended to roaming.For this reason, need to carry out scan operation, for example such as the access point of an access point AP2 and access point AP3 (inserting the example of an entity) class as other to detect other access point.
It is to be noted, wlan device can be inserted in the notebook or PDA (personal digital assistant) in WLAN card, mobile phone, be inserted into USB (USB) rod in the USB port of notebook or fixing personal computer or similar devices.In these cases, notebook and fixing personal computer are the examples of main process equipment.In addition, wlan device itself can be to have phone or the similar devices that plate carries the functional notebook of (on-board) WLAN, supports WLAN.In these cases, wlan device and main process equipment are disposed within the entity, and can only separate in logic.
According to present embodiment, when preparing roaming, the scan operation of wlan device is carried out as follows:
At first, send scan request from main process equipment.According to the scan request of present embodiment is at for example enhancing scan request of the scan request of definition in IEEE 802.11, and this scan request command wlan device begins to scan with the available BSS (basic service setting) that determines may to select after a while to add and the characteristic of IBSS (independent basic service setting).
For each channel (as scanning institute's example at the parameter of carrying out), wlan device will mail to the frame of this wlan device to the frame that connected AP (for example, the AP1 in Fig. 1 example) transmission power management bit is set in order to notify this AP buffer memory.Then this equipment begins the active direct scan (scanning process also promptly) of every next channel.When finishing at the scanning process of this channel, it can stop caching frame wlan device notice AP, and will mail to AP from any possible frame in the transmit queue of wlan device self.Defined as IEEE 802.11 defined MinChannelTime and MaxChannelTime (as the parameter of scan request), the time of a channel of scanning needs about 20-75 millisecond usually.
It is to be noted that defined as IEEE 802.11, power management bit is a defined field in the frame control field of the header of frame.
According to present embodiment, proposed such semanteme is added among the scan request, make to allow wireless device to send and receive MPDU at its interchannel that is scanning.After wlan device has scanned a channel, it will add back coupled AP, and allow send and receive MPDU before scanning moving to next channel.
This will be hereinafter referring to figs. 2 and 3 in flow chart describe.
Fig. 2 shows the scan operation of describing from the angle of wlan device.In step S1, be provided with and carry out the channel of scanning process thereon.In step S2, will be sent to the power management bit set of the Frame of AP, and send this and be grouped into AP.As previously mentioned, this will indicate this AP: the follow-up grouping that this wlan device is mail in plan should be buffered.In step S3, the mode of operation of wlan device is set in wlan device, is buffered so that will mail to the frame of this AP subsequently.
In step S4, carry out actual scanning process at particular channel (channel that is provided with among the step S1 also promptly).According to present embodiment, scanning process is initiatively.In other words, be similar to the mode shown in Fig. 6, probe requests thereby is sent to wireless medium (WM), and checks probe response.But, scanning process only is performed at a channel.
After this, process advances to step S5, in this step wlan device for example by transmission join request (as defined among the IEEE 802.11) add once more as described in AP (AP1 among Fig. 1).Then, wlan device can receive those by the grouping of this AP buffer memory, and can send the grouping that those are buffered in the transmit queue of wlan device oneself.
In step S6, check that the channel of whether all expectations all was examined.If no, process turns back to step S1, new channel is set in this step and repeats the step of back.If the channel of all expectations all was examined, then this process finishes.
It is to be noted that all checked condition of all channels is an example of the stop condition among the step S6.Replacedly, also have other stop condition, for example find suitable AP.In other words, in this situation, in active scan process, received probe response, and (for example determine AP, AP3 among Fig. 1) provides the connectivity that is fit to (also promptly, enough transmission qualities, transmission quality can measure by the received signal intensity from AP).
At the flow chart shown in Fig. 3, scanning process is described below from the angle of the access point (for example, the AP1 among Fig. 1) that wlan device connected.This process for example can be triggered when receiving frame at every turn.
In step S11, AP checks the frame (frame that is sent by wlan device also promptly) that whether has received power management bit and be set in the step S3 of Fig. 2.If do not receive such frame, then process finishes.But, if receive such frame, then process advances to step S12, and the subsequent frame that will mail to this wlan device in this step is buffered.
In step S13, check the other frame whether received from wlan device: this frame comprises and indicates the indication that the frame that is buffered can be sent to wlan device now, also, and the completed indication of scanning process.According to present embodiment, this indication is a poll frame.If do not receive such frame, process turns back to step S12.And if received poll frame from wlan device, process advances to step S14 so, the frame that is buffered in this step is sent to wlan device.And, at the buffer memory of wlan device own under the situation of frame, these frames also can be received.
In order to receive MPDU from AP, equipment uses PS (economize on electricity) poll frame, and monitoring is from the more multidata position (as defined among the IEEE 802.11) of received MPDU, to be used to determining whether that the PS that need send other discusses inquiry message to receive other MPDU or the like.In this was implemented, at least one PS poll frame always can be produced, to be used for the frame of equipment detection from AP.Depend on AP whether buffer memory at the data of this equipment, equipment sends or does not send the PS opinion and askes frame.
Selectively, can be transmitted from the transmit queue of wlan device after at the scanning process of a channel by the frame of wlan device buffer memory or MPDU (MAC (medium access control) protocol Data Unit), power management bit is cleared so that indicate a scanning process to finish in these frames or MPDU.
Especially, according to present embodiment, for scan logic operation the duration (channel of all expectations is scanned), the power management bit of Tx MPDU (sending to the MPDU of AP from WLAN) always is set.If there is not more channel to scan, depend on desired 802.11 energy-saving modes of wlan device (STA) (by the decision of WLAN host driven) so with this position, position or zero clearing, because last Tx MPDU can be used to notify the change about wlan device 802.11 energy-saving modes at AP.In addition, be under the situation of sky in the Tx formation, use special frames (802.11 empty Frame) to notify AP change usually about the wlan device powder source management mode.
Therefore, according to present embodiment, be minimized at delay with application that real-time requires.It is used for the host A PI (API) of WLAN MAC by introducing and revises the wlan device firmware code to allow the specifying enhancing scan request to be achieved, and this enhancing scan request allows wlan device to be requested the MPDU that transmits and receive data when carrying out scan operation.
Host A PI and wlan device firmware code will be described in conjunction with Fig. 4 hereinafter, and wherein Fig. 4 shows the logical construct of main process equipment A and wlan device C.
Main process equipment A as wlan device C host comprises that WLAN main frame MAC drives A1, and this A1 is the MAC layer software (SW) of higher level.In the MAC of this higher level layer, carrying out the MAC code does not have the hard real time requirement, perhaps has than its each layer real-time requirement still less down.WLAN host A PI A2 above-mentioned is provided to the connection of wlan device internet adapter software (SW) A3.This wlan device internet adapter software is converted to the specific order of wlan device with the defined logic WLAN operation of WLAN host A PI, and vice versa.
Main process equipment A and wlan device C transmit interface B (for example, being comprised at wlan device under the situation among the USB rod that will be inserted into the computer USB interface, is USB) by physics and are connected.In wlan device, carry out the MAC layer software (SW) of lower level, and as mentioned above, this MAC layer software is realized by the wlan device firmware code.
In other words, in fact WLAN MAC is divided into two part: part MAC in practice and is implemented as based on the hardware with firmware (also promptly, the lower level MAC layer software of wlan device), and part MAC is based on software (higher level MAC layer software also promptly).Usually the MAC function based on software is not a real-time function, so time requirement is lower.
In strengthening scan request, can introduce additional field or parameter, it is (also be according to the mode of present embodiment that these fields or parameter are specified this scan operation, each only at a channel) processed still should be processed according to known before mode (also promptly, at all channels).This parameter for example can be called as " separating scanning " (SplitScan), and can be Boolean variable.This title shows that actual scan operation separates, promptly at each channel.Selectively, also has other form.
Fig. 5 shows the module map according to the terminal of present embodiment.Terminal 5 comprises antenna 51, transceiver 52, control module 53 and memory 54.Particularly, control module 53 is carried out the code (also promptly, operating based on scanning, the decision of institute's received frame) that is stored in the memory 54.Thus, as previously mentioned, control module 53 is carried out the order of giving transceiver 52, in order to operate in the specified scan pattern of present embodiment.Transceiver 52 can be understood that at least a portion and the physical layer of WLAN MAC layer according to present embodiment.
In addition, the present invention also is applied to and can receives order so that the chip that the WLANMAC chip is operated as mentioned above by host A PI.According to wlan device of the present invention can be to comprise WLAN MAC and WLAN PHY layer, be used for the memory of storing software and in order to the equipment of the processor of carrying out this software.
The invention is not restricted to above-mentioned execution mode, and various modification all is possible.
For example, in the above-described embodiment, the PS poll is used to trigger downstream data traffic.Yet instead U-APSD (the automatic power-save delivery of non-scheduling) also can be used as upstream data packet, and it triggers downstream data traffic then.
And according to above-mentioned execution mode, the transmission of MPDU and reception all are performed.Yet as selection, transmission can be only to carry out to send or receive.In other words, wlan device will transmit MPDU from its transmit queue when power management bit is set, and ask the data that receive but will can not discuss, and perhaps selectively, it will be discussed and ask with the reception data, but can not send MPDU.
The optional mode of other of above-mentioned execution mode is to carry out data when transmitting with AP between the scanning process, and notify this AP: this equipment has entered 802.11 and waken powder source management mode up.Concrete, according to IEEE 802.11, in order to change powder source management mode, the frame of wlan device by the success initiated by wlan device exchanges notifies AP.Power management bit indication powder source management mode (awakening mode (AM) or economize on electricity (PS)) in the frame control field of the frame that in this exchange, sends by wlan device, also, WLAN after the entire frame exchange completes successfully with the powder source management mode of employing.
And, the invention is not restricted to WLAN, need to carry out scan operation with in other wireless network that detects suitable access entity but can be used in.
In addition, in the superincumbent execution mode, channel and/frequency be described to scan carry out at parameter.Yet, also have the parameter that other is fit to.Selectively, such parameter can also be SSID (service is provided with identifier), carries out active scan in such mode in the tabulation of SSID, and wherein probe requests thereby all is sent out on each SSID at every turn.Request can occur on same frequency or other channel.
The example of roaming has been described in the superincumbent execution mode in addition.Yet the present invention also is implemented in the situation of other workbench in for example Wireless Telecom Equipment (for example wlan device or workbench) start and search self-organizing (AdHoc) network.In this case, the buffer memory that has been sent to the data of other workbench (for example, access point) only occurs over just in the wlan device.By this way, can quicken establishment of connection.In this case, might wlan device be established to the first possible AP or the connection of other workbench, so that some data that are buffered are transmitted.It is at the interim connection of channel set of expection before scanning process is finished that this connection can be considered.After having set up this interim connection, wlan device can continue to search for/scan at other workbench and AP on other channel, to find for example at the workbench AP that better quality of connection is provided than an AP aspect the signal quality.The standard of measurement of signal quality can be signal to noise ratio and the signal strength signal intensity that receives.Search/scanning continues in the channel set of expection according to the present invention, and this process can comprise a plurality of aforesaid interim connections.
The present invention also can realize by computer program.Computer program, also, computer code can be stored on the medium such as storage card, RAM (random access storage device) or ROM (read-only memory) or hard drive.For example, this computer program can be stored in the memory 54 shown in Fig. 5.
Claims (30)
1. one kind is used for comprising that the network that inserts entity and Wireless Telecom Equipment detects the method that inserts entity, and wherein said detection is carried out at transformable parameter, and carries out following steps for each designated parameters:
Packet waiting for transmission between buffer memory Wireless Telecom Equipment and the access entity;
Carry out scanning process by described Wireless Telecom Equipment based on described designated parameters; And
The described grouping that is buffered of transmission between described Wireless Telecom Equipment and described access entity.
2. according to the method described in the claim 1, wherein said Wireless Telecom Equipment is connected with specific access entity, and described detection inserts entity at other and carries out.
3. according to the method described in the claim 1, wherein said parameter comprises the sign of frequency and/or channel and/or ad hoc wireless networks.
4. according to the method described in the claim 2, wherein in described buffer memory step, comprise step:
Receive the Frame from described cordless communication network equipment in specific access device, described Frame comprises and indicates the indication that frame will be buffered, and
Will mail to the Frame of described Wireless Telecom Equipment by described specific access device buffer memory.
5. according to the method described in the claim 4, wherein said indication is the power management bit that is set.
6. according to the method described in the claim 1, wherein in described transmitting step, comprise step:
Receive from described Wireless Telecom Equipment indicate the completed indication of described scanning process at described designated parameter after, the described grouping that is buffered is sent to described Wireless Telecom Equipment.
7. according to the method described in the claim 6, the wherein said completed indication of described scanning process that indicates at described parameter is the reception of poll frame.
8. according to the method described in the claim 6, the wherein said completed indication of described scanning process that indicates at described parameter is the frame that power management bit is cleared.
9. according to the method described in the claim 1, wherein:
In described buffer memory step, the frame that will be sent to described access entity is buffered in described Wireless Telecom Equipment, and
In described transmitting step, the described frame that is buffered is sent to described access entity.
10. according to the method described in the claim 1, wherein said scanning process comprises step:
Send explore frame, and
Wait-for-response.
11. according to the method described in the claim 1, wherein said scanning process comprises step:
Wait for and receive particular frame.
12. according to the method described in the claim 1, wherein said network is a wireless lan (wlan), described access entity is that access point (AP) and described Wireless Telecom Equipment are wlan devices.
13. according to the method described in the claim 1, wherein said detection is activated after receiving from the request as described Wireless Telecom Equipment host's main process equipment.
14. one kind is used to connect the Wireless Telecom Equipment that inserts entity, comprise and be used for detecting the checkout gear that inserts entity at network, wherein said detection is carried out at transformable parameter, and described checkout gear is suitable for carrying out the following sequence of operation at designated parameters:
Send indication to inserting entity, with buffer memory will be from described access entity transmission to described Wireless Telecom Equipment packet,
Carry out scanning process based on described designated parameters, and
Receive the described grouping that is buffered from described access entity.
15. according to the equipment described in the claim 14, wherein said Wireless Telecom Equipment is connected with specific access entity, and described scanning process inserts entity at other and carries out.
16. according to the equipment described in the claim 14, wherein said parameter comprises the sign of frequency and/or channel and/or ad hoc wireless networks.
17. according to the equipment described in the claim 14, wherein said indication is the power management bit that is set.
18. according to the equipment described in the claim 14, also comprise the buffer storage that is used for will being sent to the frame of described access entity at described scanning process buffer memory, and
Be used for after described scanning process, the described frame that is buffered being sent to the device of described access entity.
19. according to the equipment described in the claim 14, wherein said checkout gear is suitable for sending explore frame and wait-for-response in described scanning process.
20. according to the equipment described in the claim 14, wherein said checkout gear is suitable for waiting for the reception particular frame.
21. according to the equipment described in the claim 14, also comprise the device that is used for after described scanning process indication being included in the frame that will be sent to described access entity, described indication indicates at the described scanning process of a parameter and has finished and the described grouping that is buffered can send to described Wireless Telecom Equipment from described access entity.
22. according to the equipment described in the claim 21, the wherein said completed indication of described scanning process that indicates at described parameter is to send poll frame.
23. according to the equipment described in the claim 21, the wherein said completed indication of described scanning process that indicates at described parameter is the frame that power management bit is cleared.
24. according to the equipment described in the claim 14, wherein said network is a wireless lan (wlan), described access entity is that access point (AP) and described Wireless Telecom Equipment are wlan devices.
25., also comprise being used to receive from as the request of described Wireless Telecom Equipment host's main process equipment and start the device of described detection in response to the reception of this request according to the equipment described in the claim 14.
26. according to the equipment described in the claim 14, wherein said checkout gear comprises control module (53), transceiver (52), antenna (51) and memory (54).
27. at Wireless Telecom Equipment described above and that illustrate in the accompanying drawings.
28. a computer program that is used for treatment facility comprises being used for the software code part that enforcement of rights requires the step of 1-13 described in each on described treatment facility when described program is moved.
29. according to the computer program described in the claim 28, wherein said computer program comprises the computer-readable medium that stores described software code part thereon.
30. according to the computer program described in the claim 28, wherein said treatment facility is the part of wlan device.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP05011723.3 | 2005-05-31 | ||
| EP05011723 | 2005-05-31 | ||
| GB0515627.8 | 2005-07-29 |
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| CN101185291A true CN101185291A (en) | 2008-05-21 |
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| CNA2006800185938A Pending CN101185291A (en) | 2005-05-31 | 2006-05-23 | Enhanced scanning for access entities |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105210428A (en) * | 2013-05-15 | 2015-12-30 | 高通股份有限公司 | Access point response to PS-Poll |
| CN111095992A (en) * | 2017-07-27 | 2020-05-01 | 萨兰达有限公司 | Wireless network with beacon |
| CN111757423B (en) * | 2019-09-20 | 2021-04-06 | 广州极飞科技有限公司 | Wireless communication method, device, electronic equipment and computer readable storage medium |
-
2006
- 2006-05-23 CN CNA2006800185938A patent/CN101185291A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105210428A (en) * | 2013-05-15 | 2015-12-30 | 高通股份有限公司 | Access point response to PS-Poll |
| CN111095992A (en) * | 2017-07-27 | 2020-05-01 | 萨兰达有限公司 | Wireless network with beacon |
| CN111095992B (en) * | 2017-07-27 | 2023-07-11 | 萨兰达有限公司 | Wireless network with beacons |
| CN111757423B (en) * | 2019-09-20 | 2021-04-06 | 广州极飞科技有限公司 | Wireless communication method, device, electronic equipment and computer readable storage medium |
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Open date: 20080521 |