U.S. patent application number 15/665270 was filed with the patent office on 2017-12-14 for broadcasting, and scanning for wireless communication.
The applicant listed for this patent is Beijing Zhigu Rui Tuo Tech Co., Ltd. Invention is credited to Jia Liu.
Application Number | 20170359786 15/665270 |
Document ID | / |
Family ID | 50363762 |
Filed Date | 2017-12-14 |
United States Patent
Application |
20170359786 |
Kind Code |
A1 |
Liu; Jia |
December 14, 2017 |
BROADCASTING, AND SCANNING FOR WIRELESS COMMUNICATION
Abstract
Resulting in a reduction of communication power consumption, a
broadcasting method can comprise sending a broadcasting packet by
using a current power and listening; when a request is detected by
means of listening, recording the current power as a historical
power, and decreasing the current power; and determining whether a
current broadcasting event is ended, if the current broadcasting
event is ended, determining the historical power as a reference
working power, and otherwise, returning to the broadcasting and
listening. A scan method can comprise: performing scan and
listening; when a broadcasting packet is detected by means of
listening, if a request has been sent to a sender of the
broadcasting packet and a received signal strength of the
broadcasting packet changes, adjusting a first transmit power; and
sending the request to the sender of the broadcasting packet
according to the adjusted first transmit power.
Inventors: |
Liu; Jia; (Beijing,
CN) |
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Applicant: |
Name |
City |
State |
Country |
Type |
Beijing Zhigu Rui Tuo Tech Co., Ltd |
Beijing |
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CN |
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|
Family ID: |
50363762 |
Appl. No.: |
15/665270 |
Filed: |
July 31, 2017 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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15100294 |
May 27, 2016 |
9756582 |
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PCT/CN2014/090436 |
Nov 6, 2014 |
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15665270 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W 52/245 20130101;
H04W 52/143 20130101; H04W 52/228 20130101; H04W 52/322 20130101;
H04W 4/80 20180201 |
International
Class: |
H04W 52/32 20090101
H04W052/32; H04W 52/22 20090101 H04W052/22; H04W 52/14 20090101
H04W052/14; H04W 52/24 20090101 H04W052/24 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 30, 2013 |
CN |
201310632405.2 |
Claims
1. A method, comprising: performing, by a device comprising a
processor, a scan and listening; in response to a broadcasting
packet being detected by the listening, a request being determined
to have been sent to a sender of the broadcasting packet and a
received signal strength of the broadcasting packet being
determined to have changed, adjusting a first transmit power to an
adjusted first transmit power; and sending the request to the
sender of the broadcasting packet according to the adjusted first
transmit power.
2. A method, comprising: performing, by a device comprising a
processor, a scan and listening; in response to a broadcasting
packet being detected by the listening, a request being determined
to have been sent to a sender of the broadcasting packet and
information about a second transmit power comprised in the
broadcasting packet being determined to have changed, adjusting a
first transmit power to an adjusted first transmit power; and
sending the request to the sender of the broadcasting packet
according to the adjusted first transmit power.
3. The method of claim 2, further comprising: when the first
transmit power is to be adjusted, updating related information
comprised in the request resulting in updated related information,
wherein the updated related information is sent to the sender of
the broadcasting packet according to the adjusted first transmit
power.
4. The method of claim 1, further comprising: determining whether a
current scan window is ended, and in response to the current scan
window being determined not to have ended, returning to the scan
and the listening.
5. The method of claim 1, wherein the broadcasting packet comprises
a power adjustment rule.
6. The method of claim 5, wherein the adjusting the first transmit
power comprises adjusting the first transmit power according to the
power adjustment rule.
7. The method of claim 1, wherein the request is a connection
request or a scan request.
8. The method of claim 1, wherein the wireless communication is a
Bluetooth communication or a ZigBee communication.
9. A device, comprising: a memory that stores executable modules;
and a processor, coupled to the memory, that executes the
executable modules to perform operations of the apparatus, the
executable modules comprising: a scan and listening module
configured to perform scan and listening; an adjustment module
configured to, when the scan and listening module detects a
broadcasting packet via the listening if a request has been sent to
a sender of the broadcasting packet, and a received signal strength
of the broadcasting packet has been determined to have changed,
adjust a first transmit power; and a request sending module
configured to send the request to the sender of the broadcasting
packet according to the first transmit power as adjusted.
10. A device, comprising: a memory that stores executable modules;
and a processor, coupled to the memory, that executes the
executable modules to perform operations of the apparatus, the
executable modules comprising: a scan and listening module
configured to perform scan and listening; an adjustment module
configured to, when the scan and listening module detects a
broadcasting packet by means of listening, and if a request has
been sent to a sender of the broadcasting packet and information
about a second transmit power comprised in the broadcasting packet
has been determined to have changed, adjust a first transmit power;
and a request sending module configured to send the request to the
sender of the broadcasting packet according to the first transmit
power as adjusted.
11. The scan device of claim 10, wherein the executable modules
further comprise: an information update module configured to, in
response to a request to adjust the first transmit power, update
related information comprised in the request, wherein the request
sending module is configured to send, to the sender of the
broadcasting packet according to the first transmit power as
adjusted, the request comprising the updated related
information.
12. The scan device of claim 10, wherein the scan device is a
Bluetooth device or a ZigBee device.
13. A computer readable storage device, comprising at least one
executable instruction, which, in response to execution, causes a
device comprising a processor to perform operations, comprising:
performing a scan and listening; when a broadcasting packet is
detected by means of the listening, if a request has been sent to a
sender of the broadcasting packet and a received signal strength of
the broadcasting packet changes, adjusting a first transmit power
resulting in an adjusted first transmit power; and sending the
request to the sender of the broadcasting packet according to the
adjusted first transmit power.
14. A device, comprising a processor and a memory, the memory
storing executable instructions, the processor being connected to
the memory through a communication bus, and when the scan device
for wireless communications operates, the processor executes the
executable instructions stored in the memory, causing the device to
perform operations, comprising: performing a scan and listening;
when a broadcasting packet is detected by means of the listening,
if a request has been sent to a sender of the broadcasting packet
and a received signal strength of the broadcasting packet changes,
adjusting a first transmit power resulting in an adjusted first
transmit power; and sending the request to the sender of the
broadcasting packet according to the adjusted first transmit
power.
15. A computer readable storage device, comprising at least one
executable instruction, which, in response to execution, causes a
device comprising a processor to perform operations, comprising:
performing a scan and listening; when a broadcasting packet is
detected by means of the listening, if a request has been sent to a
sender of the broadcasting packet and information about a second
transmit power comprised in the broadcasting packet changes,
adjusting a first transmit power resulting in an adjusted first
transmit power; and sending the request to the sender of the
broadcasting packet according to the adjusted first transmit
power.
16. A device, comprising a processor and a memory, the memory
storing executable instructions, the processor being connected to
the memory through a communication bus, and when the scan device
for wireless communications operates, the processor executes the
executable instructions stored in the memory, causing the device to
perform operations, comprising: performing a scan and listening;
when a broadcasting packet is detected by the listening, if a
request has been sent to a sender of the broadcasting packet and
information about a second transmit power comprised in the
broadcasting packet has been determined to have changed, adjusting
a first transmit power resulting in an adjusted first transmit
power; and sending the request to the sender of the broadcasting
packet according to the adjusted first transmit power.
Description
RELATED APPLICATION
[0001] The present application is a continuation application of,
and claims priority to each of, U.S. patent application Ser. No.
15/100,294, filed on May 27, 2016, and entitled "Broadcasting, and
Scanning for Wireless Communication", which is a national phase
application under 35 U.S.C. 371 of PCT Patent Application No.
PCT/CN2014/090436, filed on Nov. 6, 2014 which claims the benefit
of priority to Chinese Patent Application No. 201310632405.2, filed
on Nov. 30, 2013. The entire contents of the referenced
applications are hereby incorporated by reference herein.
TECHNICAL FIELD
[0002] The present application relates to the field of
communications, and in particular, to a broadcasting for wireless
communication, and scanning for wireless communication.
BACKGROUND
[0003] In a wireless communications network, a common application
scenario is as follows: a first wireless device scans many other
wireless devices to discover a second wireless device, a data
connection is established and maintained between the first wireless
device and the second wireless device, and when data needs to be
transmitted, data transmission is performed. For example, a smart
phone of a user may discover a smart watch by means of Bluetooth
scan, and then a communication connection is established and
maintained; when receiving an SMS message, the smart phone can send
the SMS message to the watch so that the watch displays the SMS
message.
[0004] Using a Bluetooth Low Energy (BLE) profile as an example, a
wireless device discovery process involves different device roles
and operation procedures thereof, which comprise:
[0005] 1) A slave device role, which serves as an advertiser to
execute a broadcasting process. In this period, a slave device
keeps entering broadcasting events, as shown in FIG. 1. An interval
period T.sub.a exists between start times of neighboring
broadcasting events, and the interval period consists of a
broadcasting interval (advInterval) having a fixed length and a
broadcasting delay (advDelay) of which the length is generated
randomly. In a broadcasting event, the adviser separately sends
packet data units (PDUs), namely, broadcasting packets, on
broadcasting channels 37, 38, and 39.
[0006] 2) A master device role, which serves as an
initiator/scanner to execute an initiating/scan process. As shown
in FIG. 2, the initiating/scan process comprises a scan interval
(scanInterval) that appears repeatedly, where each interval
comprises a scan window (scan Window). In different scan windows, a
radio frequency module of the master device listens on the
broadcasting channels 37, 38, and 39, and receives a broadcasting
PDU on a corresponding channel; outside the scan window, the master
device performs regular scheduling, or turns off the radio
frequency module. If the initiator/scanner receives a broadcasting
PDU, it means that the master device successfully discovers a
corresponding advertiser device. An initiator may directly send a
connection request (CONN_REQ) to agree with an advertiser on
information such as a time point for initial sending and receiving,
an interval between different sending and receiving operations, and
a frequency hopping channel and frequency hopping mode used,
thereby establishing a connection. A scanner may send a scan
request (SCAN_REQ), to require the advertiser to reply so as to
provide more related information.
[0007] It can be seen that, a discovery process between wireless
devices is a mutual probing process, which does not involve
determining of a transmit power, and this is not favorable to
reducing power consumption of communication between wireless
devices.
SUMMARY
[0008] An example, non-limiting objective of one or more
embodiments of the present application is to provide a broadcasting
method and device for wireless communication, and a scan method and
device for wireless communication, so as to reduce power
consumption of communication between wireless devices.
[0009] According to an aspect of one or more embodiments of the
present application, a broadcasting method for wireless
communication is provided, and the method comprises:
[0010] a broadcasting and listening step: sending a broadcasting
packet by using a current power and listening;
[0011] a power decreasing step: when a request is detected by means
of listening, recording the current power as a historical power,
and decreasing the current power; and
[0012] a power determining step: determining whether a current
broadcasting event is ended, if the current broadcasting event is
ended, determining the historical power as a reference working
power, and otherwise, returning to the broadcasting and listening
step.
[0013] According to another aspect of one or more embodiments of
the present application, a scan method for wireless communication
is provided, and the method comprises:
[0014] a scan and listening step: performing scan and
listening;
[0015] an adjustment step: when a broadcasting packet is detected
by means of listening, if a request has been sent to a sender of
the broadcasting packet and a received signal strength of the
broadcasting packet changes, adjusting a first transmit power;
and
[0016] a request sending step: sending the request to the sender of
the broadcasting packet according to the adjusted first transmit
power.
[0017] According to another aspect of one or more embodiments of
the present application, a scan method for wireless communication
is provided, and the method comprises:
[0018] a scan and listening step: performing scan and
listening;
[0019] an adjustment step: when a broadcasting packet is detected
by means of listening, if a request has been sent to a sender of
the broadcasting packet and information about a second transmit
power and comprised in the broadcasting packet changes, adjusting a
first transmit power; and
[0020] a request sending step: sending the request to the sender of
the broadcasting packet according to the adjusted first transmit
power.
[0021] According to another aspect of one or more embodiments of
the present application, a broadcasting device for wireless
communication is provided, and the broadcasting device
comprises:
[0022] a broadcasting and listening module, configured to send a
broadcasting packet by using a current power and listen;
[0023] a power decreasing module, configured to: when the
broadcasting and listening module detects a request by means of
listening, record the current power as a historical power, and
decrease the current power; and
[0024] a power determining module, configured to determine whether
a current broadcasting event is ended, and if the current
broadcasting event is ended, determine the historical power as a
reference working power.
[0025] According to another aspect of one or more embodiments of
the present application, a scan device for wireless communication
is provided, and the scan device comprises:
[0026] a scan and listening module, configured to perform scan and
listen;
[0027] an adjustment module, configured to: when the scan and
listening module detects a broadcasting packet by means of
listening, if a request has been sent to a sender of the
broadcasting packet and a received signal strength of the
broadcasting packet changes, adjust a first transmit power; and
[0028] a request sending module, configured to send the request to
the sender of the broadcasting packet according to the adjusted
first transmit power.
[0029] According to another aspect of one or more embodiments of
the present application, a scan device for wireless communication
is provided, and the scan device comprises:
[0030] a scan and listening module, configured to perform scan and
listen;
[0031] an adjustment module, configured to: when the scan and
listening module detects a broadcasting packet by means of
listening, if a request has been sent to a sender of the
broadcasting packet and information about a second transmit power
comprised in the broadcasting packet changes, adjust a first
transmit power; and
[0032] a request sending module, configured to send the request to
the sender of the broadcasting packet according to the adjusted
first transmit power.
[0033] According to another aspect of one or more embodiments of
the present application, a computer readable storage device is
provided, and the computer readable storage device comprises at
least one executable instruction, which, in response to execution,
causes a broadcasting device for wireless communications comprising
a processor to perform operations, comprising:
[0034] a broadcasting and listening step: sending a broadcasting
packet by using a current power and listening;
[0035] a power decreasing step: when a request is detected by means
of listening, recording the current power as a historical power,
and decreasing the current power; and
[0036] a power determining step: determining whether a current
broadcasting event is ended, if the current broadcasting event is
ended, determining the historical power as a reference working
power, and otherwise, returning to the broadcasting and listening
step.
[0037] According to another aspect of one or more embodiments of
the present application, a broadcasting device for wireless
communications is provided, the broadcasting device for wireless
communications characterized by comprising a processor and a
memory, the memory storing computer executable instructions, the
processor being connected to the memory through a communication
bus, and when the broadcasting device for wireless communications
operates, the processor executing the computer executable
instructions stored in the memory, so that the broadcasting device
for wireless communications executes operations, comprising:
[0038] a broadcasting and listening step: sending a broadcasting
packet by using a current power and listening;
[0039] a power decreasing step: when a request is detected by means
of listening, recording the current power as a historical power,
and decreasing the current power; and
[0040] a power determining step: determining whether a current
broadcasting event is ended, if the current broadcasting event is
ended, determining the historical power as a reference working
power, and otherwise, returning to the broadcasting and listening
step.
[0041] According to another aspect of one or more embodiments of
the present application, a computer readable storage device is
provided, the computer readable storage device comprises at least
one executable instruction, which, in response to execution, causes
a scan device for wireless communications comprising a processor to
perform operations, comprising:
[0042] a scan and listening step: performing scan and
listening;
[0043] an adjustment step: when a broadcasting packet is detected
by means of listening, if a request has been sent to a sender of
the broadcasting packet and a received signal strength of the
broadcasting packet changes, adjusting a first transmit power; and
a request sending step: sending the request to the sender of the
broadcasting packet according to the adjusted first transmit
power.
[0044] According to another aspect of one or more embodiments of
the present application, a scan device for wireless communications
is provided, the scan device for wireless communications
characterized by comprising a processor and a memory, the memory
storing computer executable instructions, the processor being
connected to the memory through a communication bus, and when the
scan device for wireless communications operates, the processor
executing the computer executable instructions stored in the
memory, so that the scan device for wireless communications
executes operations, comprising:
[0045] a scan and listening step: performing scan and
listening;
[0046] an adjustment step: when a broadcasting packet is detected
by means of listening, if a request has been sent to a sender of
the broadcasting packet and a received signal strength of the
broadcasting packet changes, adjusting a first transmit power;
and
[0047] a request sending step: sending the request to the sender of
the broadcasting packet according to the adjusted first transmit
power.
[0048] According to another aspect of one or more embodiments of
the present application, a computer readable storage device is
provided, the computer readable storage device comprises at least
one executable instruction, which, in response to execution, causes
a scan device for wireless communications comprising a processor to
perform operations, comprising:
[0049] a scan and listening step: performing scan and
listening;
[0050] an adjustment step: when a broadcasting packet is detected
by means of listening, if a request has been sent to a sender of
the broadcasting packet and information about a second transmit
power comprised in the broadcasting packet changes, adjusting a
first transmit power; and
[0051] a request sending step: sending the request to the sender of
the broadcasting packet according to the adjusted first transmit
power.
[0052] According to another aspect of one or more embodiments of
the present application, a scan device for wireless communications
is provided, the scan device for wireless communications
characterized by comprising a processor and a memory, the memory
storing computer executable instructions, the processor being
connected to the memory through a communication bus, and when the
scan device for wireless communications operates, the processor
executing the computer executable instructions stored in the
memory, so that the scan device for wireless communications
executes operations, comprising:
[0053] a scan and listening step: performing scan and
listening;
[0054] an adjustment step: when a broadcasting packet is detected
by means of listening, if a request has been sent to a sender of
the broadcasting packet and information about a second transmit
power comprised in the broadcasting packet changes, adjusting a
first transmit power; and
[0055] a request sending step: sending the request to the sender of
the broadcasting packet according to the adjusted first transmit
power
[0056] In a broadcasting method and a broadcasting device of one or
more embodiments of the present application, after a request is
detected by means of listening, a broadcasting event is not ended
immediately; instead, broadcasting and listening are continued
after a power value is decreased, until the current broadcasting
event is ended, so that a finally determined reference working
power is closer to a minimum power of the broadcasting device while
ensuring communication, where the reference working power may be
used as a working power of a communication connection, or may be
used as a basis for selecting a connection object by a device,
which is beneficial to reducing communication power
consumption.
[0057] In a scan method and a scan device of one or more
embodiments of the present application, when a broadcasting packet
is received, a communication connection is not established
immediately or more information is not acquired from a sender of
the broadcasting packet immediately; instead, it is determined
whether a first transmit power used for sending the request needs
to be adjusted, and if the first transmit power needs to be
adjusted, the request is sent to the sender of the broadcasting
packet after the first transmit power is adjusted. By adjusting the
first transmit power, the first transmit power is closer to a
minimum power of the scan device while ensuring communication, and
the finally obtained first transmit power can be used as a
reference working power. A scan method provides a data support for
reducing communication power consumption, and is beneficial to
reducing communication power consumption.
BRIEF DESCRIPTION OF THE DRAWINGS
[0058] FIG. 1 is a flowchart of a broadcasting method for wireless
communication according to an embodiment of the present
application;
[0059] FIG. 2 is a flowchart of a broadcasting method for wireless
communication according to another embodiment of the present
application;
[0060] FIG. 3 is a flowchart of a scan method for wireless
communication according to an embodiment of the present
application;
[0061] FIG. 4 is a flowchart of a scan method for wireless
communication according to another embodiment of the present
application;
[0062] FIG. 5 is a schematic structural diagram of modules of a
broadcasting device according to an embodiment of the present
application;
[0063] FIG. 6 is a schematic structural diagram of modules of a
broadcasting device according to another embodiment of the present
application;
[0064] FIG. 7a is a schematic structural diagram of modules of an
example scan device according to an embodiment of the present
application;
[0065] FIG. 7b is a schematic structural diagram of modules of
another example scan device according to an embodiment of the
present application;
[0066] FIG. 8a is a schematic structural diagram of modules of an
example scan device according to another embodiment of the present
application;
[0067] FIG. 8b is a schematic structural diagram of modules of
another example scan device according to another embodiment of the
present application;
[0068] FIG. 9 is a hardware schematic structural diagram of a
broadcasting device according to an embodiment of the present
application; and
[0069] FIG. 10 is a hardware schematic structural diagram of a scan
device according to an embodiment of the present application.
DETAILED DESCRIPTION
[0070] The following describes specific example embodiments of the
present application in further detail with reference to the
accompanying drawings and embodiments. The following embodiments
are used to describe the present application, but are not intended
to limit the scope of the present application.
[0071] Persons skilled in the art may understand that, technical
terms such as "first" and "second" in the present application are
merely used to distinguish different steps, devices, modules, or
the like, and the technical terms neither represent any specific
technical meaning nor indicate any certain logical sequence.
[0072] In addition, in one or more of the embodiments of the
present application, sequence numbers of the following steps do not
indicate an execution sequence of steps; the execution sequence of
the steps depends on functions and internal logic of the steps, and
should not constitute any limitation on the implementation process
of the embodiments of the present application.
[0073] In many application scenarios, one device may discover
another device by using a high transmit power, and establish a
wireless communication connection, so as to transmit data. In order
to reduce communication power consumption, after the wireless
communication connection is established, the device may decrease
the transmit power thereof to an appropriate value, where the
appropriate value is generally between a maximum power and a
minimum power of the device, and it is favorable that the
appropriate value can just ensure effective communication. By means
of such power adjustment, communication power consumption can be
reduced to a certain extent. However, before the power is adjusted,
the problem of high power consumption still exists. If a power
value that just can be used for effective communication of the
device is determined before establishment of a communication
connection, for example, during a device discovery process, and the
determined power value is used as a reference working power for
communication of the device after the connection is established,
the communication power consumption can be further reduced.
[0074] Therefore, an embodiment of the present application provides
a broadcasting method for wireless communication. As shown in FIG.
1, the method comprises the following steps:
[0075] S120: A broadcasting and listening step: send a broadcasting
packet by using a current power and listen.
[0076] S140: A power decreasing step: when a request is detected by
means of listening, record the current power as a historical power,
and decrease the current power.
[0077] S160: A power determining step: determine whether a current
broadcasting event is ended, if the current broadcasting event is
ended, determine the historical power as a reference working power,
and otherwise, return to the broadcasting and listening step.
[0078] In a broadcasting method according to an embodiment of the
present application, first, a broadcasting packet is sent by using
a high power; after a request is detected by means of listening, a
broadcasting event is not ended immediately; instead, broadcasting
and listening are continued after a power value is decreased, until
the current broadcasting event is ended, so that a finally
determined reference working power is closer to a minimum power of
a sender of the broadcasting packet while ensuring communication,
where the reference working power may be used as a working power of
a communication connection, or may be used as a basis for selecting
a connection object by a device, which is beneficial to reducing
communication power consumption.
[0079] Specifically, in Step S140, the request may be a connection
request sent by an initiator, or a scan request sent by a
scanner.
[0080] The decreasing the current power may be decreasing the
current power according to a power adjustment algorithm, where the
power adjustment algorithm may be, for example, at least one of a
dynamic programming algorithm, a prediction algorithm, and a search
algorithm. For example, a simple search algorithm is that, a fixed
step value is subtracted from the current power each time.
[0081] Optionally, the broadcasting packet may comprise the power
adjustment algorithm, so that a receiver of the broadcasting packet
may cooperate with a sender of the broadcasting packet when the
sender sends the request (a connection request or scan request),
for example, delaying sending of the request.
[0082] In Step S160, each broadcasting event generally comprises
predetermined times of broadcasting packet sending, and after the
predetermined times of broadcasting packet sending are completed,
whether the request is received or not, the broadcasting event is
ended. By using BLE communication as an example, each broadcasting
event thereof generally comprises three times of broadcasting
packet sending, and therefore, in the method, the value of the
current power can be adjusted twice at most, and a reference
working power obtained after the adjustment can be close to the
minimum power. It is understood by persons skilled in the art that,
if each broadcasting event can comprise more times of broadcasting
packet sending, the reference working power can be closer to the
minimum power, thereby making it easier to reduce communication
power consumption.
[0083] In addition, to ensure that the reference working power can
be obtained in Step S160, an initial value of the current power
should be large enough, so that the request can be detected by
means of listening after first broadcasting.
[0084] In an example embodiment of a method of the present
application, to ensure that a sender of the request can determine,
according to the received broadcasting packet, a power for sending
the request, the broadcasting packet optionally comprises the
current power. According to the current power, and a signal
strength when the broadcasting packet is received, the sender of
the request can calculate a corresponding path loss. Based on the
path loss, the sender of the request can determine a transmit power
ensuring that the request is just received correctly, and then
sends the request by using the transmit power, thereby further
reducing the communication power consumption.
[0085] Referring to FIG. 2, in an example embodiment of the present
application, Step S140 further comprises: modifying the power
adjustment algorithm according to the request. For example, when
the sender of the broadcasting packet supports multiple power
adjustment algorithms, while the sender of the request only
supports one of the power adjustment algorithms, the sender of the
request may describe, in the request, the power adjustment
algorithm supported by the sender of the request, and after
receiving the request, the sender of the broadcasting packet may
modify the power adjustment algorithms to be the power adjustment
algorithm supported by the sender of the request. By means of the
foregoing modification, the sender of the broadcasting packet and
the sender of the request may cooperate with each other,
facilitating quick acquisition of a reference working power close
to the minimum power.
[0086] In addition, as shown in FIG. 2, the method further
comprises the following step:
[0087] S150: A power increasing step: when no request is detected
by means of listening, increase the current power. Generally, the
method is started with a high current power, and then, the current
power is decreased gradually according to Step S140; that no
request is detected by means of listening may be caused by an
excessively low current power. For example, assuming that a
broadcasting packet sent by a broadcasting device by using minimum
3 dB can be just detected by another scan device by means of
listening, when the broadcasting device sends the broadcasting
packet by using 8 dB in the first time, the broadcasting device can
receive a request; when the broadcasting device sends the
broadcasting packet by using 4 dB in the second time, the
broadcasting device can still receive a request; when the
broadcasting device sends the broadcasting packet by using 2 dB in
the third time, the broadcasting device cannot receive a request
due to an excessively low power. In this case, by increasing the
current power appropriately, the probability of detecting a request
by means of listening by the broadcasting device can be increased.
Optionally, the current power may be increased according to the
power adjustment algorithm.
[0088] In addition, if a request is detected by means of listening
before the power is decreased, while no request is detected by
means of listening after the power is decreased, it indicates that
by using the power which is before being decreased, namely, the
historical power, the request can be detected by means of
listening. Therefore, to obtain a reference working power close to
the minimum power, the increased current power is less than or
equal to the historical power. Still using the foregoing
assumption, when increasing the current power, the broadcasting
device may try to increase the current power to 2.5 dB or 3 dB, but
it is unnecessary to increase the current power to 4.5 dB, because
it has been proved that at 4 dB, a request can be received.
[0089] In conclusion, in a broadcasting method according to an
embodiment of the present application, after a request is detected
by means of listening, broadcasting and listening may be continued
after a power is gradually decreased according to a power
adjustment algorithm, and when no request can be obtained by means
of listening, broadcasting and listening may be continued after the
power is increased according to the power adjustment algorithm. In
addition, the power adjustment algorithm may be modified according
to the received request, and by performing a series of adjustment
on a transmit power of the broadcasting packet, a finally
determined reference working power is close to a minimum power of a
sender of the broadcasting packet while ensuring communication,
which provides a data support for reducing communication power
consumption, and is beneficial to reducing communication power
consumption in the field of communications, such as Bluetooth and
ZigBee.
[0090] In addition, an embodiment of the present application
further provides a computer-readable medium, comprising a computer
readable instruction when the following operations are executed:
executing operations of steps S120, S140 and S160 of the method in
the embodiment shown in the above FIG. 1.
[0091] Referring to FIG. 3, an embodiment of the present
application further provides a scan method for wireless
communication, and the scan method comprises the following
steps:
[0092] S320: A scan and listening step: perform scan and
listen.
[0093] S340: An adjustment step: when a broadcasting packet is
detected by means of listening, if a request has been sent to a
sender of the broadcasting packet and a received signal strength of
the broadcasting packet changes, adjust a first transmit power.
[0094] S360: A request sending step: send the request to the sender
of the broadcasting packet according to the adjusted first transmit
power.
[0095] In a scan method according to an embodiment of the present
application, when receiving a broadcasting packet, a request sender
does not establish a communication connection immediately or
acquire more information from a sender of the broadcasting packet
immediately; instead, the request sender determines whether a first
transmit power used for sending a request needs to be adjusted; and
if a request has been sent to the sender of the broadcasting packet
and a received signal strength of the broadcasting packet changes,
after adjusts the first transmit power, and then sends the request
to the sender of the broadcasting packet. By adjusting the first
transmit power, the first transmit power is closer to a minimum
power of the request sender, and the finally obtained first
transmit power can be used as a reference working power. The scan
method provides a data support for reducing communication power
consumption, which is beneficial to reducing communication power
consumption.
[0096] According to the prior art, when the sender of the
broadcasting packet does not receive any request, and broadcasting
times do not cause a broadcasting event to end, the sender of the
broadcasting packet continues to send the broadcasting packet;
after the sender of the broadcasting packet receives a request, the
broadcasting event is ended. To implement the method of the present
application, it may be set that, for a common broadcasting packet
sender, when it does not receive any request and broadcasting times
do not cause a broadcasting event to end, the common broadcasting
packet sender continues to send the broadcasting packet by using an
unchanged power; and for a broadcasting packet sender capable of
adjusting a power, as described in the present application, when it
does not receive any request and broadcasting times do not cause a
broadcasting event to end, the broadcasting packet sender of the
present application continues to send the broadcasting packet after
increasing the power, and when it receives a request and
broadcasting times do not cause the broadcasting event to end, the
broadcasting packet sender of the present application continues to
send the broadcasting packet after decreasing the power.
[0097] Therefore, when the request sender receives the broadcasting
packet from the sender of the broadcasting packet again after
sending the request to the sender of the broadcasting packet (that
is, the broadcasting packet from the same broadcasting packet
sender is received at least twice), and the transmit power of the
broadcasting packet changes, it indicates that the sender of the
broadcasting packet receives the request, and is adjusting the
transmit power.
[0098] When the position of the sender of the broadcasting packet
is relatively fixed, for example, the sender of the broadcasting
packet is a server or a desktop computer, in this case, if a
received signal strength of the broadcasting packet changes, it can
be considered that the sender of the broadcasting packet actively
adjusts the transmit power. This indicates that the sender of the
broadcasting packet expects to obtain, by adjusting the transmit
power, a reference working power that can ensure communication and
is close to a minimum power of the sender of the broadcasting
packet. In this case, the request sender may also adjust the first
transmit power, so that the first transmit power is closer to a
minimum power of the request sender.
[0099] During adjustment on the first transmit power, the first
transmit power may be adjusted according to a change trend of a
second transmit power. For example, when the second transmit power
decreases, the first transmit power is decreased, and when the
second transmit power increases, the first transmit power is
increased. When the second transmit power decreases, it indicates
that the sender of the broadcasting packet receives the request
previously sent by the request sender, and therefore, the request
sender may try a lower transmit power; when the second transmit
power increases, it indicates that the sender of the broadcasting
packet does not receive the request previously sent by the request
sender, and therefore, the request sender should try a higher
transmit power.
[0100] In addition, optionally, the broadcasting packet may
comprise a power adjustment algorithm; when the first transmit
power needs to be adjusted, the first transmit power may be
adjusted according to the power adjustment algorithm. The power
adjustment algorithm may be an adjustment algorithm used by the
sender of the broadcasting packet to adjust the transmit power of
itself, and the request sender may make reference to the power
adjustment algorithm for the broadcasting packet, to adjust the
first transmit power.
[0101] Referring to FIG. 4, in another embodiment of the present
application, before Step S360, the method further comprises:
[0102] S350: An update step: when the first transmit power needs to
be adjusted, update related information comprised in the
request.
[0103] Correspondingly, in Step S360, the request comprising the
updated related information is sent to the sender of the
broadcasting packet according to the adjusted first transmit
power.
[0104] When the request sender sends the request to the sender of
the broadcasting packet for multiple times, if information about a
connection establishment time and comprised in the request is not
updated, in the case where a connection needs to be established,
the request sender and the sender of the broadcasting packet may
need multiple connection attempts before successfully establishing
a connection. Therefore, the related information herein may
comprise the information about a connection establishment time.
[0105] After Step S360, the method further comprises the following
step:
[0106] S370: A window determining step: determine whether a current
scan window is ended, and if the current scan window is not ended,
return to the scan and listening step.
[0107] In Step S370, each scan window may comprise unfixed times of
scanning. Using BLE communication as an example, a Bluetooth device
executing scan may be constantly in a scan window when there is no
other task except a scan task; when another task is assigned to the
Bluetooth device according to scheduling, the Bluetooth device ends
the scan window. It can be understood by persons skilled in the art
that, if more times of scan can be executed in each scan window,
the first transmit power may have more chances to be adjusted, and
therefore, the first transmit power can be closer to the minimum
power, making it easier to reduce communication power
consumption.
[0108] In conclusion, in a scan method according to an embodiment
of the present application, when receiving a broadcasting packet, a
request sender may determine, according to a request sending
history and a received signal strength of the broadcasting packet,
whether a first transmit power for sending a request needs to be
adjusted, and if the first transmit power needs to be adjusted,
adjusts the first transmit power, then sends the request to a
sender of the broadcasting packet, and repeats the foregoing
process before a current scan window is ended. By adjusting the
first transmit power, the first transmit power is close to a
minimum power of the request sender while ensuring communication,
and the finally obtained first transmit power can be used as a
reference working power. The scan method provides a data support
for reducing communication power consumption, and is beneficial to
reducing communication power consumption in fields of
communications such as Bluetooth and ZigBee.
[0109] In addition, an embodiment of the present application
further provides a computer-readable medium, comprising a computer
readable instruction when the following operations are executed:
executing operations of steps S320, S340 and S360 of the method in
the embodiment shown in the above FIG. 3.
[0110] An embodiment of the present application provides another
scan method for wireless communication, and the scan method
comprises the following steps:
[0111] S420: A scan and listening step: perform scan and
listen.
[0112] S440: An adjustment step: when a broadcasting packet is
detected by means of listening, if a request has been sent to a
sender of the broadcasting packet and information about a second
transmit power comprised in the broadcasting packet changes, adjust
a first transmit power.
[0113] S460: A request sending step: send the request to the sender
of the broadcasting packet according to the adjusted first transmit
power.
[0114] In a scan method according to an embodiment of the present
application, when receiving a broadcasting packet, a request sender
does not establish a communication connection immediately or
acquire more information from a sender of the broadcasting packet
immediately; instead, the request sender determines whether a first
transmit power used for sending a request needs to be adjusted; and
if a request has been sent to the sender of the broadcasting packet
and information about a second transmit power and comprised in the
broadcasting packet changes, adjusts the first transmit power and
then sends the request to the sender of the broadcasting packet. By
adjusting the first transmit power, the first transmit power is
closer to a minimum power of the request sender while ensuring
communication, and the finally obtained first transmit power can be
used as a reference working power. The scan method provides a data
support for reducing communication power consumption, and is
beneficial to reducing communication power consumption.
[0115] Similar to the foregoing embodiment, to implement the method
of the present application, it may be set that, for a common
broadcasting packet sender, when it does not receive any request
and broadcasting times do not cause a broadcasting event to end,
the common broadcasting packet sender continues to send the
broadcasting packet by using an unchanged power; and for a
broadcasting packet sender capable of adjusting a power, as
described in the present application, when it does not receive any
request and broadcasting times do not cause a broadcasting event to
end, the broadcasting packet sender of the present application
continues to send the broadcasting packet after increasing the
power, and when it receives a request and broadcasting times do not
cause the broadcasting event to end, the broadcasting packet sender
of the present application continues to send the broadcasting
packet after decreasing the power.
[0116] Therefore, when the request sender receives the broadcasting
packet from the sender of the broadcasting packet again after
sending the request to the sender of the broadcasting packet (that
is, the broadcasting packet from the same broadcasting packet
sender is received at least twice), and the transmit power of the
broadcasting packet changes, it indicates that the sender of the
broadcasting packet receives the request, and is adjusting the
transmit power.
[0117] In this embodiment, the broadcasting packet comprises
information about a second transmit power, that is, comprises
information about a transmit power of the broadcasting packet;
after receiving the broadcasting packet, the request sender reads
the information about the second transmit power in the broadcasting
packet, and if the information about the second transmit power
changes, it indicates that the sender of the broadcasting packet
expects to obtain, by adjusting the transmit power, a reference
working power close to a minimum power of the sender of the
broadcasting packet. In this case, the request sender may also
adjust the first transmit power, so that the first transmit power
is closer to the minimum power of the request sender.
[0118] Similar to the foregoing embodiment, during adjustment on
the first transmit power, the first transmit power may be adjusted
according to a change trend of the second transmit power. For
example, when the second transmit power decreases, the first
transmit power is decreased, and when the second transmit power
increases, the first transmit power is increased. When the second
transmit power decreases, it indicates that the sender of the
broadcasting packet receives the request previously sent by the
request sender, and therefore, the request sender may try a lower
transmit power; when the second transmit power increases, it
indicates that the sender of the broadcasting packet does not
receive the request previously sent by the request sender, and
therefore, the request sender should try a higher transmit
power.
[0119] In addition, optionally, the broadcasting packet may
comprise a power adjustment algorithm; when the first transmit
power needs to be adjusted, the first transmit power may be
adjusted according to the power adjustment algorithm. The power
adjustment algorithm may be an adjustment algorithm used by the
sender of the broadcasting packet to adjust the transmit power of
itself, and the request sender may make reference to the power
adjustment algorithm of the broadcasting packet, to adjust the
first transmit power.
[0120] Before Step S460, the method further comprises the following
step:
[0121] S450: An update step: when the first transmit power needs to
be adjusted, update related information comprised in the
request.
[0122] Correspondingly, in Step S460, the request comprising the
updated related information is sent to the sender of the
broadcasting packet according to the adjusted first transmit
power.
[0123] When the request sender sends the request to the sender of
the broadcasting packet for multiple times, if information about a
connection establishment time and comprised in the request is not
updated, in the case where a connection needs to be established,
the request sender and the sender of the broadcasting packet may
need multiple connection attempts before successfully establishing
a connection. Therefore, the related information herein may
comprise the information about a connection establishment time.
[0124] After Step S460, the method may further comprise:
[0125] S470: A window determining step: determine whether a current
scan window is ended, and if the current scan window is ended,
return to the scan and listening step.
[0126] In Step S470, each scan window may comprise unfixed times of
scanning. Using BLE communication as an example, a Bluetooth device
executing scan may be constantly in a scan window when there is no
other task except a scan task; when another task is assigned to the
Bluetooth device according to scheduling, the Bluetooth device ends
the scan window. It can be understood by persons skilled in the art
that, if more times of scan can be executed in each scan window,
the first transmit power may have more chances to be adjusted, and
therefore, the first transmit power can be closer to the minimum
power, making it easier to reduce communication power
consumption.
[0127] In conclusion, in a scan method according to an embodiment
of the present application, when receiving a broadcasting packet, a
request sender may determine, according to a request sending
history and information about a second transmit power and comprised
in the broadcasting packet, whether a first transmit power for
sending a request needs to be adjusted, and if the first transmit
power needs to be adjusted, adjusts the first transmit power, then
sends the request to a sender of the broadcasting packet, and
repeats the foregoing process before a current scan window is
ended. By adjusting the first transmit power, the first transmit
power is close to a minimum power of the request sender while
ensuring communication, and the finally obtained first transmit
power can be used as a reference working power. The scan method
provides a data support for reducing communication power
consumption, and is beneficial to reducing communication power
consumption in fields of communications, such as Bluetooth and
ZigBee.
[0128] In addition, an embodiment of the present application
further provides a computer-readable medium, comprising a computer
readable instruction when the following operations are executed:
executing operations of steps S420, S440 and S460 of the method in
the embodiment above.
[0129] FIG. 5 is a schematic structural diagram of modules of a
broadcasting device for wireless communication according to an
embodiment of the present application. The broadcasting device 500
may be a Bluetooth device, a ZigBee device, or the like, for
example, the broadcasting device 500 may be a Bluetooth headset, a
smart phone, or a smart glass.
[0130] As shown in FIG. 5, the broadcasting device 500 may
comprise: a broadcasting and listening module 510, a power
decreasing module 520, and a power determining module 530.
[0131] The broadcasting and listening module 510 is configured to
send a broadcasting packet by using a current power and listen.
[0132] The power decreasing module 520 is configured to: when the
broadcasting and listening module 510 detects a request by means of
listening, record the current power as a historical power, and
decrease the current power.
[0133] The power determining module 530 is configured to determine
whether a current broadcasting event is ended, and if the current
broadcasting event is ended, determine the historical power as a
reference working power.
[0134] Specifically, the request may be a connection request sent
by an initiator, or a scan request sent by a scanner.
[0135] The decreasing the current power may be decreasing the
current power according to a power adjustment algorithm, where the
power adjustment algorithm may be, for example, at least one of a
dynamic programming algorithm, a prediction algorithm, and a search
algorithm. For example, a simple search algorithm is that, a fixed
step value is subtracted from the current power each time.
[0136] Optionally, the broadcasting packet may comprise the power
adjustment algorithm, so that a receiver of the broadcasting packet
may cooperate with a sender of the broadcasting packet when the
sender sends the request (a connection request or scan request),
for example, delaying sending of the request.
[0137] Each broadcasting event generally comprises predetermined
times of broadcasting packet sending, and after the predetermined
times of broadcasting packet sending are completed, whether the
request is received or not, the broadcasting event is ended. By
using BLE communication as an example, each broadcasting event
thereof generally comprises three times of broadcasting packet
sending, and therefore, in the method, the value of the current
power can be adjusted twice at most, and a reference working power
obtained after the adjustment can be close to the minimum power. It
is understood by persons skilled in the art that, if each
broadcasting event can comprise more times of broadcasting packet
sending, the reference working power can be closer to the minimum
power, thereby making it easier to reduce communication power
consumption.
[0138] Referring to FIG. 6, in another embodiment of the present
application, the broadcasting device 500 may further comprise: a
power increasing module 540 and an algorithm modification module
550.
[0139] The power increasing module 540 is configured to: when the
broadcasting and listening module does not detect any request by
means of listening, increase the current power. Generally, that no
request is detected by means of listening may be caused by an
excessively low current power. In this case, by increasing the
current power appropriately, the probability of detecting a request
by means of listening can be increased. Optionally, the current
power may be increased according to the power adjustment
algorithm.
[0140] In addition, if a request is detected by means of listening
before the power is decreased, while no request is detected by
means of listening after the power is decreased, it indicates that
by using the power which is before being decreased, namely, the
historical power, the request can be detected by means of
listening. Therefore, to obtain a reference working power close to
the minimum power, the increased current power is less than or
equal to the historical power.
[0141] The algorithm modification module 550 is configured to: when
the broadcasting and listening module detects the request by means
of listening, modify the power adjustment algorithm according to
the request. For example, when the broadcasting device supports
multiple power adjustment algorithms, while a sender of the request
only supports one of the power adjustment algorithms, the sender of
the request may describe, in the request, the power adjustment
algorithm supported by the sender of the request, and after
receiving the request, the broadcasting device may modify the power
adjustment algorithms to be the power adjustment algorithm
supported by the sender of the request. By means of the foregoing
modification, the broadcasting device and the request sender may
cooperate with each other, which facilitates quick acquisition of a
reference working power close to the minimum power.
[0142] FIG. 7a is a schematic structural diagram of modules of a
scan device for wireless communication according to an embodiment
of the present application. The scan device 700 may be a Bluetooth
device, a ZigBee device, or the like, for example, the scan device
700 may be a Bluetooth headset, a smart phone, or a smart
glass.
[0143] As shown in FIG. 7a, the scan device 700 may comprise: a
scan and listening module 710, an adjustment module 720, and a
request sending module 730.
[0144] The scan and listening module 710 is configured to perform
scan and listen.
[0145] The adjustment module 720 is configured to: when the scan
and listening module 710 detects a broadcasting packet by means of
listening, if a request has been sent to a sender of the
broadcasting packet and a received signal strength of the
broadcasting packet changes, adjust a first transmit power.
[0146] The request sending module 730 is configured to send the
request to the sender of the broadcasting packet according to the
adjusted first transmit power.
[0147] Specifically, in this embodiment, the request may be a
connection request or a scan request.
[0148] According to the prior art, when the broadcasting device
does not receive any request, and broadcasting times do not cause a
broadcasting event to end, the broadcasting device continues to
send the broadcasting packet; after the broadcasting device
receives a request, the broadcasting event is ended. To implement
the method of the present application, it may be set that, for a
common broadcasting device, when it does not receive any request
and broadcasting times do not cause a broadcasting event to end,
the broadcasting device continues to send the broadcasting packet
by using an unchanged power; and for an broadcasting device capable
of adjusting a power, as described in the present application, when
it does not receive any request and broadcasting times do not cause
a broadcasting event to end, the broadcasting device of the present
application continues to send the broadcasting packet after
increasing the power, and when it receives a request and
broadcasting times do not cause the broadcasting event to end, the
broadcasting device of the present application continues to send
the broadcasting packet after decreasing the power.
[0149] Therefore, when the scan device receives the broadcasting
packet from the broadcasting device again after sending the request
to the broadcasting device (that is, the broadcasting packet from
the same broadcasting device is received at least twice), and the
transmit power of the broadcasting packet changes, it indicates
that the broadcasting device receives the request, and is adjusting
the transmit power.
[0150] When the position of the broadcasting device is relatively
fixed, for example, the broadcasting device is a server or a
desktop computer, in this case, if a received signal strength of
the broadcasting packet changes, it can be considered that the
broadcasting device actively adjusts the transmit power. This
indicates that the broadcasting device expects to obtain, by
adjusting the transmit power, a reference working power that can
ensure communication and is close to a minimum power of the
broadcasting device. In this case, the scan device may also adjust
the first transmit power, so that the first transmit power is
closer to a minimum power of the scan device.
[0151] When the first transmit power needs to be adjusted, the
adjustment module 720 may adjust the first transmit power according
to a change trend of a second transmit power. For example, when the
second transmit power decreases, the first transmit power is
decreased, and when the second transmit power increases, the first
transmit power is increased. When the second transmit power
decreases, it indicates that the broadcasting device receives the
request previously sent by the scan device, and therefore, the scan
device may try a lower transmit power; when the second transmit
power increases, it indicates that the broadcasting device does not
receive the request previously sent by the scan device, and
therefore, the scan device should try a higher transmit power.
[0152] Referring to FIG. 7b, in another embodiment of the present
application, the scan device 700 may further comprise:
[0153] an information update module 740, configured to: when the
first transmit power needs to be adjusted, update related
information comprised in the request.
[0154] When the scan device sends the request to the broadcasting
device for multiple times, if information about a connection
establishment time and comprised in the request is not updated, in
the case where a connection needs to be established, the scan
device and the broadcasting device may need multiple connection
attempts before successfully establishing a connection. Therefore,
the related information herein may comprise the information about a
connection establishment time.
[0155] The request sending module 730 sends, to the sender of the
broadcasting packet according to the adjusted first transmit power,
the request comprising the updated related information.
[0156] FIG. 8a is a schematic structural diagram of modules of a
scan device for wireless communication according to another
embodiment of the present application. The scan device 800 may be a
Bluetooth device, a ZigBee device, or the like, for example, the
scan device 800 may be a Bluetooth headset, a smart phone, or a
smart glass.
[0157] As shown in FIG. 8a, the scan device 800 may comprise: a
scan and listening module 810, an adjustment module 820, and a
request sending module 820.
[0158] The scan and listening module 810 is configured to perform
scan and listen.
[0159] The adjustment module 820 is configured to: when scan and
listening module 810 detects a broadcasting packet by means of
listening, if a request has been sent to a sender of the
broadcasting packet and information about a second transmit power
and comprised in the broadcasting packet changes, adjust a first
transmit power.
[0160] The request sending module 830 is configured to send the
request to the sender of the broadcasting packet according to the
adjusted first transmit power.
[0161] Specifically, in this embodiment, the request may be a
connection request or a scan request.
[0162] Similar to the foregoing embodiment, in order to implement
the method of the present application, it may be set that, for a
common broadcasting device, when it does not receive any request
and broadcasting times do not cause a broadcasting event to end,
the broadcasting device continues to send the broadcasting packet
by using an unchanged power; and for a broadcasting device capable
of adjusting a power, as described in the present application, when
it does not receive any request and broadcasting times do not cause
a broadcasting event to end, the broadcasting device of the present
application continues to send the broadcasting packet after
increasing the power, and when it receives a request and
broadcasting times do not cause the broadcasting event to end, the
broadcasting device of the present application continues to send
the broadcasting packet after decreasing the power.
[0163] Therefore, when the scan device receives the broadcasting
packet from the broadcasting device again after sending the request
to the broadcasting device (that is, the broadcasting packet from
the same broadcasting device is received at least twice), and the
transmit power of the broadcasting packet changes, it indicates
that the broadcasting device receives the request, and is adjusting
the transmit power.
[0164] In this embodiment, the broadcasting packet comprises
information about a second transmit power, that is, comprises
information about a transmit power of the broadcasting packet;
after receiving the broadcasting packet, the scan device reads the
information about the second transmit power in the broadcasting
packet, and if the information about the second transmit power
changes, it indicates that the broadcasting device expects to
obtain, by adjusting the transmit power, a reference working power
that can ensure communication and is close to a minimum power of
the broadcasting device. In this case, the scan device may also
adjust the first transmit power, so that the first transmit power
is closer to a minimum power of the scan device.
[0165] During adjustment on the first transmit power, the
adjustment module 820 may adjust the first transmit power according
to a change trend of the second transmit power. For example, when
the second transmit power decreases, the first transmit power is
decreased, and when the second transmit power increases, the first
transmit power is increased. When the second transmit power
decreases, it indicates that the broadcasting device receives the
request previously sent by the scan device, and therefore, the scan
device may try a lower transmit power; when the second transmit
power increases, it indicates that the broadcasting device does not
receive the request previously sent by the scan device, and
therefore, the scan device should try a higher transmit power.
[0166] Referring to FIG. 8b, in another embodiment of the present
application, the scan device 800 may further comprise:
[0167] an information update module 840, configured to: when the
first transmit power needs to be adjusted, update related
information comprised in the request.
[0168] When the scan device sends the request to the broadcasting
device for multiple times, if information about a connection
establishment time and comprised in the request is not updated, in
the case in which a connection needs to be established, the scan
device and the broadcasting device may need multiple connection
attempts before successfully establishing a connection. Therefore,
the related information herein may comprise the information about a
connection establishment time.
[0169] The request sending module 830 sends, to the sender of the
broadcasting packet according to the adjusted first transmit power,
the request comprising the updated related information.
[0170] A hardware structure of the broadcasting device of this
embodiment is shown in FIG. 9. The specific embodiment of the
present application does not limit the specific implementation of
the broadcasting device. Referring to FIG. 9, the broadcasting
device 900 may comprise:
[0171] a processor 910, a communications interface 920, a memory
930, and a communication bus 940.
[0172] The processor 910, the communications interface 920, and the
memory 930 communicate with each other through the communication
bus 940.
[0173] The communications interface 920 is configured to
communicate with another network element such as a scan device.
[0174] The processor 910 is configured to execute a program 932,
and specifically may execute related steps in the method embodiment
shown in FIG. 3.
[0175] Specifically, the program 932 may comprise program code, and
the program code comprises a computer operation instruction.
[0176] The processor 910 may be a central processing unit (CPU) or
an application specific integrated circuit (ASIC), or configured as
one or more integrated circuits for implementing an embodiment of
the present application.
[0177] The memory 930 is configured to store the program 932. The
memory 930 may comprise a high-speed random access memory (RAM),
and may also comprise a non-volatile memory, for example, at least
one magnetic disk memory. The program 932 specifically may execute
the following steps:
[0178] a broadcasting and listening step: sending a broadcasting
packet by using a current power and listening;
[0179] a power decreasing step: when a request is detected by means
of listening, recording the current power as a historical power,
and decreasing the current power; and a power determining step:
determining whether a current broadcasting event is ended, if the
current broadcasting event is ended, determining the historical
power as a reference working power, and otherwise, returning to the
broadcasting and listening step.
[0180] For specific implementation of each step in the program 932,
reference may be made to a corresponding step or module in the
foregoing embodiment, and description is not repeated herein. It
can be clearly understood by persons skilled in the art that, to
make the description convenient and concise, for specific working
processes of the device and modules described above, reference may
be made to descriptions of corresponding processes in the foregoing
method embodiment, and description is not repeated herein.
[0181] A hardware structure of the scan device according to this
embodiment is shown in FIG. 10. The specific embodiment of the
present application does not limit the specific implementation of
the scan device. Referring to FIG. 10, the scan device 1000 may
comprise:
[0182] a processor 1010, a communications interface 1020, a memory
1030, and a communication bus 1040.
[0183] The processor 1010, the communications interface 1020, and
the memory 1030 communicate with each other through the
communication bus 1040.
[0184] The communications interface 1020 is configured to
communicate with another network element such as a broadcasting
device.
[0185] The processor 1010 is configured to execute a program 1032,
and specifically may execute related steps in the method embodiment
shown in FIG. 1.
[0186] Specifically, the program 1032 may comprise program code,
where the program code comprises a computer operation
instruction.
[0187] The processor 1010 may be a CPU or an ASIC, or configured as
one or more integrated circuits for implementing an embodiment of
the present application.
[0188] The memory 1030 is configured to store the program 1032. The
memory 1030 may comprise a high-speed RAM, and may also comprise a
non-volatile memory, for example, at least one magnetic disk
memory. The program 1032 specifically may execute the following
steps:
[0189] a scan and listening step: performing scan and
listening;
[0190] an adjustment step: when a broadcasting packet is detected
by means of listening, if a request has been sent to a sender of
the broadcasting packet and a received signal strength of the
broadcasting packet changes, adjusting a first transmit power;
and
[0191] a request sending step: sending the request to the sender of
the broadcasting packet according to the adjusted first transmit
power.
[0192] Alternatively, the program 1032 specifically may execute the
following steps:
[0193] a scan and listening step: performing scan and
listening;
[0194] an adjustment step: when a broadcasting packet is detected
by means of listening, if a request has been sent to a sender of
the broadcasting packet and information about a second transmit
power and comprised in the broadcasting packet changes, adjusting a
first transmit power; and
[0195] a request sending step: sending the request to the sender of
the broadcasting packet according to the adjusted first transmit
power.
[0196] For specific implementation of each step in the program
1032, reference may be made to a corresponding step or module in
the foregoing embodiment, and description is not repeated herein.
It can be clearly understood by persons skilled in the art that, to
make the description convenient and concise, for specific working
processes of the device and modules described above, reference may
be made to descriptions of corresponding processes in the foregoing
method embodiment, and description is not repeated herein.
[0197] Those of ordinary skill in the art may realize that, the
exemplary units and method steps described with reference to the
embodiments disclosed in this specification can be implemented by
electronic hardware, or a combination of computer software and
electronic hardware. Whether these functions are implemented as
hardware or software depends upon the particular application and
design constraint conditions of the technical solution. Persons
skilled in the art can use different methods to achieve the
described functions for each particular application, but it should
not be considered that such implementation goes beyond the scope of
the present application.
[0198] If implemented in the form of a software functional unit and
sold or used as an independent product, the functions can be stored
in a computer-readable storage medium. Based on such understanding,
the technical solution of the present application essentially or
the part which contributes to the prior art or a part of the
technical solution can be embodied in the form of a software
product, and the computer software product is stored in a storage
medium, and comprises several instructions for instructing a
computer device (for example, a personal computer, a controller, or
a network device) to execute all or some steps of the method
described in each embodiment of the present application. The
foregoing storage medium comprises various media capable of storing
program code, such as a USB flash disk, a removable hard disk
drive, a read-only memory (ROM), a RAM, a magnetic disk, or an
optical disc.
[0199] The above example embodiments are only used to describe the
present application, instead of limiting the present application;
various modifications and variations can be made by those of
ordinary skill in the art without departing from the spirit and
scope of the present application. Therefore, all equivalent
technical solutions also belong to the scope of the present
application, and the patent protection scope of the present
application should be subject to the claims.
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