CN115665888A

CN115665888A - Method for establishing Bluetooth connection, storage medium, chip, earphone and equipment system

Info

Publication number: CN115665888A
Application number: CN202211347069.2A
Authority: CN
Inventors: 刘境发
Original assignee: Shenzhen Zhongke Lanxun Technology Co ltd
Current assignee: Shenzhen Zhongke Lanxun Technology Co ltd
Priority date: 2022-10-31
Filing date: 2022-10-31
Publication date: 2023-01-31

Abstract

The invention relates to the technical field of earphones, and discloses a method for establishing Bluetooth connection, a storage medium, a chip, an earphone and an equipment system. The method comprises the following steps: the method comprises the steps of obtaining an identification frame transmitted by a master device, wherein the identification frame comprises a synchronization head, local clock time of the master device, offset time and a master Bluetooth address, determining that the local clock time of the master device is mapped to the master clock time on a time axis of the slave device according to the identification frame, generating connection information according to the master clock time and the master Bluetooth address, and controlling the slave device and the master device to establish Bluetooth connection according to the connection information. In the embodiment, the local clock time, the offset time and the master Bluetooth address of the master device are calibrated through the identification frame, and the slave device can generate the connection information according to the information carried by the identification frame so as to establish Bluetooth connection with the master device, so that the process of inquiring and paging required by classical Bluetooth connection can be replaced, and the Bluetooth connection efficiency and the connection speed can be improved.

Description

Method for establishing Bluetooth connection, storage medium, chip, earphone and equipment system

Technical Field

The invention relates to the technical field of earphones, in particular to a method for establishing Bluetooth connection, a storage medium, a chip, an earphone and an equipment system.

Background

In traditional classic bluetooth, a bluetooth connection is typically established by means of paging and page scanning. The master device first performs wireless channel matching with the slave devices in paging scanning by intensively transmitting ID packets, and after matching, the slave devices acquire clock information of the master device through FHS packets and establish Bluetooth connection with the master device. In the process of paging and paging scanning of classic bluetooth, due to the adoption of a frequency hopping mode of 32 wireless channels, the master device and the slave device are difficult to be matched at the same time under the same wireless channel and the same time window, so that the matching time of the master device and the slave device has higher randomness, and the bluetooth connection efficiency is not high.

Disclosure of Invention

An object of the embodiments of the present invention is to provide a method, a storage medium, a chip, an earphone, and an apparatus system for establishing a bluetooth connection, which aim to improve the problem of low efficiency of the existing bluetooth connection.

In a first aspect, an embodiment of the present invention provides a method for establishing a bluetooth connection, where the method is applied to a slave device, and the method includes:

acquiring an identification frame transmitted by a master device, wherein the identification frame comprises a synchronization head, local clock time of the master device, offset time and a master Bluetooth address;

determining local clock time of the master device to be mapped to master clock time on a time axis of the slave device according to the identification frame;

generating connection information according to the master clock time and the master Bluetooth address;

and controlling the slave equipment to establish Bluetooth connection with the master equipment according to the connection information.

Optionally, after the obtaining the identification frame, the method further includes:

controlling the slave device to enter a handshake state;

controlling the slave device to transmit a handshake request to the master device, so that the master device enters a handshake state according to the handshake request.

Optionally, the method further comprises:

in the handshake state, if a master handshake packet transmitted by the master equipment is received within a preset handshake time, the Bluetooth connection state is entered;

and transmitting a slave handshake packet to the master device according to the master handshake packet in the Bluetooth connection state, so that the master device enters the Bluetooth connection state according to the slave handshake packet.

Optionally, the method further comprises:

in the handshake state, if the master handshake packet transmitted by the master device is not received within the preset handshake time, the identification frame transmitted by the master device is monitored again.

Optionally, the determining, according to the identification frame, that the local clock time of the master device is mapped to the master clock time on the time axis of the slave device includes:

calculating the clock offset of the slave equipment relative to the master equipment according to the identification frame;

and determining that the local clock time of the master device is mapped to the master clock time on the time axis of the slave device according to the local clock time of the slave device and the clock offset.

Optionally, the calculating, according to the identification frame, a clock offset of the slave device with respect to the master device includes:

when the identification frame is received, determining an initial receiving time, wherein the initial receiving time is the time when the slave equipment receives the identification frame;

determining initial transmitting time according to the local clock time and the offset time of the master device;

and calculating the clock offset of the slave equipment relative to the master equipment according to the starting transmitting time and the starting receiving time.

Optionally, the connection information includes a connection access code and a frequency hopping sequence, and the controlling the slave device to establish a bluetooth connection with the master device according to the connection information includes:

calculating a connection access code according to the main Bluetooth address;

generating a frequency hopping sequence according to the master clock time and the master Bluetooth address;

and controlling the slave equipment to establish Bluetooth connection with the master equipment according to the frequency hopping sequence and the connection access code.

Optionally, the identification frame further includes connection additional information, and before controlling the slave device to establish a bluetooth connection with the master device, the method further includes:

and filtering the identification frames which do not meet the connection matching condition according to the connection additional information.

Optionally, the acquiring the identification frame transmitted by the master device includes:

selecting one predetermined wireless channel as a target wireless channel from a plurality of predetermined wireless channels in each transmission period;

and scanning the target wireless channel according to a preset frame scanning window to obtain an identification frame, wherein the scanning duration of the preset frame scanning window is greater than or equal to the sum of the emission period and the frame length of the identification frame.

In a second aspect, an embodiment of the present invention provides a method for establishing a bluetooth connection, where the method is applied to a master device, and includes:

transmitting an identification frame to a slave device, so that the slave device determines that the local clock time of the master device is mapped to the master clock time on the time axis of the slave device according to the identification frame, generates connection information according to the master clock time and the master Bluetooth address, and controls the slave device to establish Bluetooth connection with the master device according to the connection information, wherein the identification frame comprises the local clock time, the offset time and the master Bluetooth address of the master device.

Optionally, the transmitting the identification frame to the slave device includes:

determining a specified number of predetermined wireless channels in each transmission period;

and transmitting the identification frame to the slave equipment through each predetermined wireless channel in each transmission period.

Optionally, the method further comprises:

after each preset wireless channel finishes transmitting the identification frame, setting a scanning request window after the transmission finishing time of the identification frame;

and monitoring whether a handshake request transmitted from a device is received in the request scanning window.

Optionally, the method further comprises:

when the master device receives a handshake request transmitted by the slave device, controlling the master device to enter a handshake state;

and when the master device does not receive the handshake request transmitted by the slave device, controlling the master device to continue transmitting the identification frame.

Optionally, the method further comprises:

in a handshake state, alternately performing a transmission operation of a master handshake packet and a reception operation of a slave handshake packet, which is transmitted by the slave device, within a preset handshake time;

if the slave handshake packet is received within the preset handshake time, controlling the master device to enter a connection state;

and if the slave handshake packet is not received within the preset handshake time, controlling the master equipment to retransmit the identification frame.

In a third aspect, an embodiment of the present invention provides a storage medium, which is characterized by storing computer-executable instructions for causing an electronic device to execute the above method for establishing a bluetooth connection.

In a fourth aspect, an embodiment of the present invention provides a chip, including:

at least one processor; and the number of the first and second groups,

a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,

the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of establishing a bluetooth connection described above.

In a fifth aspect, an embodiment of the present invention provides a headset, including:

a Bluetooth module;

at least one processor in communication with the Bluetooth module; and the number of the first and second groups,

In a sixth aspect, an embodiment of the present invention provides an apparatus system, including:

a slave device, comprising a first bluetooth module, a first processor and a first memory, wherein the at least one first processor is in communication connection with the first bluetooth module and the first memory, respectively, wherein the first memory stores instructions executable by the at least one first processor, and the instructions are executed by the at least one first processor, so that the at least one first processor can execute the above method for establishing a bluetooth connection;

the master device comprises a second Bluetooth module, a second processor and a second memory, wherein the at least one second processor is respectively in communication connection with the second Bluetooth module and the second memory, the second memory stores instructions executable by the at least one second processor, and the instructions are executed by the at least one second processor, so that the at least one second processor can execute the above method for establishing Bluetooth connection.

In the method for establishing bluetooth connection provided by the embodiment of the present invention, an identification frame transmitted by a master device is obtained, where the identification frame includes a synchronization header, a local clock time of the master device, an offset time, and a master bluetooth address, the local clock time of the master device is determined to be mapped to the master clock time on a time axis of the slave device according to the identification frame, connection information is generated according to the master clock time and the master bluetooth address, and the slave device is controlled to establish bluetooth connection with the master device according to the connection information. In the embodiment, the local clock time, the offset time and the master Bluetooth address of the master device are calibrated through the identification frame, and the slave device can generate the connection information according to the information carried by the identification frame so as to establish Bluetooth connection with the master device, so that the process of inquiring and paging required by classical Bluetooth connection can be replaced, and the Bluetooth connection efficiency and the connection speed can be improved.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings which correspond to and are not to be construed as limiting the embodiments, in which elements having the same reference numeral designations represent like elements throughout, and in which the drawings are not to be construed as limiting in scale unless otherwise specified.

Fig. 1 is a schematic structural diagram of an equipment system according to an embodiment of the present invention;

FIG. 2 is a communication timing diagram of a classic Bluetooth communication protocol;

fig. 3 is a schematic structural diagram of an earphone system according to an embodiment of the present invention;

fig. 4 is a flowchart illustrating a method for establishing a bluetooth connection according to an embodiment of the present invention;

fig. 5 is a schematic diagram of transmitting an identification frame in three wireless channels according to an embodiment of the present invention;

fig. 6 is a schematic diagram of transmitting an identification frame in three predetermined wireless channels in each transmission period according to an embodiment of the present invention;

fig. 7 is a schematic diagram illustrating that a scanning request window is set after each predetermined wireless channel has transmitted an identification frame according to an embodiment of the present invention;

fig. 8 is a schematic diagram that illustrates a local clock of a master device being behind a local clock of a slave device according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a local clock time of a master device before a local clock of a slave device according to an embodiment of the present invention;

fig. 10 is a timing diagram of a master device and a slave device during an identification frame transmission phase, a handshake phase, and a connection phase according to an embodiment of the present invention;

fig. 11 is a schematic circuit structure diagram of an earphone according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if not conflicting, various features of the embodiments of the present invention may be combined with each other within the scope of the present invention. Additionally, while functional block divisions are performed in apparatus schematics, with logical sequences shown in flowcharts, in some cases, steps shown or described may be performed in sequences other than block divisions in apparatus or flowcharts. The terms "first", "second", "third", and the like used in the present invention do not limit data and execution order, but distinguish the same items or similar items having substantially the same function and action.

The embodiment of the invention provides an equipment system, which adopts a Bluetooth communication protocol, wherein the equipment system can be any type of system, for example, the equipment system is an earphone system, a sound system or an intelligent home system.

Referring to fig. 1, a device system 100 includes a slave device 11 and a master device 12. The slave device 11 comprises a first bluetooth module 111, a first processor 112 and a first memory 113, the at least one first processor 112 being in communication connection with the first bluetooth module 111 and the first memory 113, respectively, wherein the first memory 113 stores instructions executable by the at least one first processor 112, the instructions being executable by the at least one first processor 112 to enable the at least one first processor 112 to perform the method of establishing a bluetooth connection as set forth below.

With continued reference to fig. 1, the master device 12 includes a second bluetooth module 121, a second processor 122 and a second memory 123, and the at least one second processor 122 is communicatively connected to the second bluetooth module 121 and the second memory 123, respectively, wherein the second memory 123 stores instructions executable by the at least one second processor 122, and the instructions are executed by the at least one second processor 122, so that the at least one second processor 122 can execute the method for establishing a bluetooth connection, which is described below.

The classical bluetooth communication protocol is based on the local clock of the master device, wherein one local clock CLKN has a period of 312.5us, and the period of every two local clocks is called a slot, i.e. the period of one slot is 625us. Referring to fig. 2, the master device 12 transmits data in the even slots and receives data in the odd slots, and the slave device 11 correspondingly receives data in the odd slots and transmits data in the even slots.

In some embodiments, the device system 100 is a headphone system or a sound box system. Referring to fig. 3, the earphone system includes a first earphone 31, a second earphone 32 and a charging chamber 33, the charging chamber 33 includes two receiving slots, the two receiving slots respectively receive the first earphone 31 and the second earphone 32, and the charging chamber 33 can charge the first earphone 31 and/or the second earphone 32 placed in the receiving slots.

The first headset 31 and the second headset 32 may both be TWS headsets, wherein the first headset 31 and the second headset 32 may establish a bluetooth connection using the method of establishing a bluetooth connection set forth below, the first headset 31 and the second headset 32 communicating with each other based on the bluetooth communication connection.

In some embodiments, the first headset 31 may be a master device, and the second headset 32 may be a slave device, for example, the first headset 31 broadcasts its pairing information, the second headset 32 scans the pairing information of the first headset 31, and if the second headset 32 successfully authenticates the pairing information of the first headset 31, the second headset 32 may pair with the first headset 31.

In some embodiments, the first earpiece 31 may be a slave device and the second earpiece 32 may be a master device. For example, the second headset 32 broadcasts its pairing information, the first headset 31 scans the pairing information of the second headset 32, and if the first headset 31 successfully authenticates the pairing information of the second headset 32, the first headset 31 can pair with the second headset 32.

As another aspect of the embodiments of the present invention, an embodiment of the present invention provides a method for establishing a bluetooth connection, which is applied to a slave device. Referring to fig. 4, the method for establishing bluetooth connection includes:

s41: and acquiring an identification frame transmitted by the master equipment, wherein the identification frame comprises a synchronization head, the local clock time of the master equipment, the offset time and the master Bluetooth address.

In this step, the main device may be an earphone, a sound box, or other devices, wherein the earphone or the sound box may be a TWS earphone or a TWS sound box. The main device can transmit the identification frame by adopting any suitable communication mode, wherein the communication mode comprises a 6G communication mode, a 5G communication mode, a 4G communication mode, a 3G communication mode, a 2G communication mode, a CDMA communication mode, a ZigBee communication mode, a Bluetooth communication mode, a wireless broadband WiFi communication mode, an ultra-wideband UWB communication mode, a near field communication NFC communication mode, a GSM (global system for mobile communications), an infrared communication mode, an ISM (industrial scientific medical) communication mode, an RFID (radio frequency identification) communication mode, a UMTS/3GPPw/HSDPA (universal mobile telecommunications/high speed packet access) communication mode, a WiMAXwi-wi-Fi communication mode and the like.

The identification frame is a data frame at least encapsulating a synchronization header, a local clock time of the master device, an offset time and a master bluetooth address, please refer to table 1:

TABLE 1

SyncWord

CLKN_t

Offset

Address

The data structure of the identification frame is shown in table 1, where:

SyncWord is used to represent the sync header, which is used to represent the identification frame. CLKN _ t is used to represent the local clock time when the master device transmits the identification frame. The Offset is used for indicating the time of the initial transmission time Offset CLKN _ t time when the main device transmits the identification frame, the Offset time can be obtained by calculation before the transmission of the identification frame and filled into an Offset field in advance, and can also be latched into the Offset field in real time by a hardware timer according to the transmission time of the identification frame. The Address is used for representing a master Bluetooth Address, wherein the master Bluetooth Address is the Bluetooth Address of the master device.

In some embodiments, the sync header may be represented in any suitable manner, and may be a random number or a specific sequence agreed by the master and slave devices. In some embodiments, the local clock time CLKN _ t of the identification frame may be any local clock time in the master device, for example, the local clock time CLKN _ t of the master device may be the start time of CLK0 or CLK1 or CLK 2.

Referring to fig. 5, the master device transmits a first identification frame through the first wireless channel at the local clock time CLKN _ t plus the time corresponding to the first Offset time Offset 1. Then, the master device transmits a second identification frame through the second wireless channel at the time corresponding to the local clock time CLKN _ t plus the second Offset time Offset 2. Then, the master device transmits a third identification frame through the third wireless channel at the time corresponding to the local clock time CLKN _ t plus the third Offset time Offset 3.

In some embodiments, when the master device transmits the identification frame to the slave device, a specified number of predetermined wireless channels per transmission period may be determined, and the identification frame is transmitted to the slave device over each predetermined wireless channel per transmission period. The slave device selects one preset wireless channel from a plurality of preset wireless channels in each transmission period as a target wireless channel, and scans the target wireless channel according to a preset frame scanning window to obtain an identification frame. The main equipment can select a plurality of preset wireless channels to transmit the identification frame, so that the problem that a single wireless channel is easily interfered is effectively avoided.

In some embodiments, the specified number is less than the total number of channels specified by a classic bluetooth communication protocol when the master device transmits the identification frame using bluetooth communication. Wherein the predetermined wireless channel may be one of 79 wireless channels specified for a classic bluetooth communication protocol. It will be appreciated that when the master device transmits the identification frame using other communication means, the predetermined wireless channel may be a channel corresponding to that communication means and is not limited to the wireless channel specified by the classic bluetooth communication protocol.

The transmission period is a time interval of two adjacent transmission operations for transmitting the identification frame in the same predetermined wireless channel. The predetermined wireless channel is a channel selected to transmit the identification frame among a plurality of wireless channels. The specified number can be customized by the designer based on engineering experience, such as specifying a number of 3 or 4 or 5, and a total number of channels as specified by the classic bluetooth communication protocol of 79.

Referring to fig. 6, the master device selects 3 wireless channels from 79 wireless channels defined in the classic bluetooth communication protocol as predetermined wireless channels, and the 3 predetermined wireless channels are a first predetermined wireless channel, a second predetermined wireless channel and a third predetermined wireless channel, respectively.

The master device transmits a first identification frame a through a first predetermined wireless channel at an interval of a first Offset time Offset1, transmits a second identification frame B through a second predetermined wireless channel at an interval of a second Offset time Offset2, and transmits a third identification frame C through a third predetermined wireless channel at an interval of a third Offset time Offset3 at a local clock time CLKN _ t (N).

When none of the slave devices receives the first identification frame a, the second identification frame B, and the third identification frame C, the master device transmits the fourth identification frame D through the first predetermined wireless channel again at the interval of the first Offset time Offset1, transmits the fifth identification frame E through the second predetermined wireless channel again at the interval of the second Offset time Offset2, and transmits the sixth identification frame F through the third predetermined wireless channel again at the interval of the third Offset time Offset3 at the local clock time CLKN _ T (N + T). Wherein T is the emission period.

Similarly, when none of the slave devices receives the fourth identification frame D, the fifth identification frame E and the sixth identification frame F, the master device transmits the seventh identification frame G again through the first predetermined wireless channel at the local clock time CLKN _ T (N + 2T) at the interval of the first Offset time Offset1, transmits the eighth identification frame H again through the second predetermined wireless channel at the interval of the second Offset time Offset2, and transmits the ninth identification frame I again through the third predetermined wireless channel at the interval of the third Offset time Offset 3. Wherein T is the emission period.

The time between the local clock time CLKN _ T (N + T) and the local clock time CLKN _ T (N) is a first transmission period, and the time between the local clock time CLKN _ T (N + 2T) and the local clock time CLKN _ T (N + T) is a second transmission period. There are 3 predetermined wireless channels in the first transmission period or the second transmission period or the third transmission period, which are the first predetermined wireless channel, the second predetermined wireless channel and the third predetermined wireless channel, respectively.

In some embodiments, the present embodiment adjusts each transmission period according to a random delay algorithm, so as to avoid the problem that the transmission period is easy to attack due to the selection of a fixed transmission period.

In some embodiments, after each predetermined wireless channel finishes transmitting the identification frame, the master device sets a request scanning window after the transmission end time of the identification frame, and listens in the request scanning window whether a handshake request transmitted by the slave device is received.

Referring to fig. 7, after the master device transmits the first identification frame a on the first predetermined wireless channel, a first request scanning window W1 is set to monitor whether a handshake request transmitted from the slave device is received. Similarly, after the master device transmits the second identification frame B on the second predetermined wireless channel, a second request scanning window W2 is then set to monitor whether a handshake request transmitted by the slave device is received. After the master device transmits the third identification frame C on the third predetermined wireless channel, a third request scanning window W3 is then set to listen whether a handshake request transmitted by the slave device is received.

S42: and determining that the local clock time of the master device is mapped to the master clock time on the time axis of the slave device according to the identification frame.

In this step, the master clock time is the time when the local clock time of the master device is mapped onto the time axis of the slave device. Typically, the local clock of the master device and the local clock of the slave device are not aligned, for example, the local clock time CLKN _ nt0 of the master device may lead or lag the local clock CLKN _ st0 of the slave device.

Referring to fig. 8, a local clock time CLKN _ nt0 of the master device follows the local clock CLKN _ st0 of the slave device, wherein the local clock time CLKN _ nt0 of the master device is mapped to the master clock time CLKN _ nt0' on the time axis of the slave device.

Referring to fig. 9, a local clock time CLKN _ nt0 of the master device precedes a local clock CLKN _ st0 of the slave device, wherein the local clock time CLKN _ nt0 of the master device is mapped to a master clock time CLKN _ nt0 "on a time axis of the slave device.

S43: and generating connection information according to the master clock time and the master Bluetooth address.

In this step, the connection information is information for prompting the slave device to establish a bluetooth connection with the master device.

S44: and controlling the slave device to establish Bluetooth connection with the master device according to the connection information.

In this step, the slave device establishes a bluetooth connection with the master device according to the connection information. In some embodiments, the connection information includes a connection access code and a frequency hopping sequence, and controlling the slave device to establish a bluetooth connection with the master device according to the connection information includes: and calculating a connection access code according to the master Bluetooth address, generating a frequency hopping sequence according to the master clock time and the master Bluetooth address, and controlling the slave equipment to establish Bluetooth connection with the master equipment according to the frequency hopping sequence and the connection access code.

In the embodiment, the local clock time, the offset time and the master Bluetooth address of the master device are calibrated through the identification frame, and the slave device can generate the connection information according to the information carried by the identification frame so as to establish Bluetooth connection with the master device, so that the process of inquiring and paging required by classical Bluetooth connection can be replaced, and the Bluetooth connection efficiency and the connection speed can be improved.

Meanwhile, in the embodiment, a plurality of wireless channels with a small number are selected from 79 wireless channels specified by a classic bluetooth communication protocol as the predetermined wireless channels, so that the problem that a single wireless channel is easily interfered is effectively avoided.

In addition, compared with the traditional method that dense ID packets are transmitted to hit a smaller paging scanning window when paging is performed on 32 channels of Bluetooth, the method of the embodiment can improve the success rate of matching between the transmitting channel and the receiving channel, so that the timeliness of communication between the master device and the slave device can be ensured.

In some embodiments, the identification frame further includes connection additional information, and the controlling the slave device to establish the bluetooth connection with the master device according to the hopping sequence and the connection access code includes: and controlling the slave equipment to establish Bluetooth connection with the master equipment according to the frequency hopping sequence, the connection access code and the connection additional information.

Please refer to table 2:

TABLE 2

SyncWord

CLKN_t

Offset

Address

AddiInfo

The data structure of the identification frame is shown in table 2, where addiino is used to indicate connection additional information, and the connection additional information is used to indicate attribute information of the bluetooth connection.

In some embodiments, the connection additional information includes bluetooth name, TWS channel, support characteristics, pairing code, and the like. Before controlling the slave device to establish the bluetooth connection with the master device, the method for establishing the bluetooth connection further includes: and filtering the identification frames which do not meet the connection matching condition according to the connection additional information.

In some embodiments, the connection matching condition includes a name matching condition or a channel matching condition or a characteristic matching condition or a pairing code matching condition, and filtering the identification frame that does not satisfy the connection matching condition according to the connection additional information includes: determining a Bluetooth name or a TWS sound channel or characteristic information or a pairing code of the main equipment according to the connection additional information, judging whether the Bluetooth name of the main equipment meets a name matching condition or not, or whether the TWS sound channel of the main equipment meets the sound channel matching condition or not, or whether the characteristic information meets the characteristic matching condition or not, or whether the pairing code meets the pairing code matching condition or not, if so, retaining the identification frame encapsulated with the connection additional information, and if not, filtering the identification frame encapsulated with the connection additional information.

The slave device can quickly filter out incompatible master devices by connecting additional information, and reduce unnecessary communication, thereby effectively reducing the communication times in the connection process and improving the connection speed.

In some embodiments, acquiring the identification frame transmitted by the master device comprises the steps of:

s411: one of the predetermined wireless channels in each transmission period is selected as a target wireless channel.

S412: and scanning the target wireless channel according to a preset frame scanning window to obtain the identification frame, wherein the scanning duration of the preset frame scanning window is greater than or equal to the sum of the emission period and the frame length of the identification frame.

In S411, for example, the second predetermined wireless channel is selected as the target wireless channel among the first predetermined wireless channel, the second predetermined wireless channel and the third predetermined wireless channel.

In S412, the preset frame scanning window is a window that is configured in advance by the slave device and is used for monitoring the identification frame, and since the scanning duration of the preset frame scanning window is greater than or equal to the sum of the transmission period and the frame length of the identification frame, the slave device can monitor the target wireless channel for the scanning duration of the preset frame scanning window, so that the identification frame transmitted by the master device on the target wireless channel can be reliably monitored. Traditional bluetooth is through paging in order to establish the mode that the bluetooth is connected, because the matching of master slave equipment has certain randomness, is uncontrollable in the connection time, appears easily that master slave equipment is in the time overlength under the state of standing still when receiving the interference to bluetooth connection efficiency has been reduced. However, in the present embodiment, the target wireless channel is selected to monitor the identification frame with the scanning duration greater than or equal to the sum of the transmission period and the frame length of the identification frame, which can improve the reliability of receiving the identification frame and improve the bluetooth connection efficiency.

In some embodiments, after acquiring the identification frame, the method for establishing the bluetooth connection further comprises the following steps:

s45: the controlling slave enters a handshake state.

S46: and controlling the slave device to transmit a handshake request to the master device so that the master device enters a handshake state according to the handshake request.

In step S45, the handshake state is a state in which a handshake packet is transmitted to the counterpart, and the slave device automatically enters the handshake state after receiving the identification frame.

In step S46, after the slave device receives the identification frame, the slave device transmits a handshake request to the master device, where the handshake request is used to trigger the master device to enter the handshake request. When the master device receives a handshake request transmitted by the slave device, the master device enters a handshake state, and when the master device does not receive the handshake request transmitted by the slave device, the master device continues to transmit an identification frame.

For example, referring to fig. 10, the master device transmits identification frames a, B and C on the first to third predetermined wireless channels, respectively, wherein each time ten thousands of identification frames are transmitted on one predetermined wireless channel, a scanning request window is set behind the identification frames, which are scanning request windows W1 to W3, respectively. The slave device obtains the identification frame C by listening to the third predetermined radio channel, at which point the slave device enters a handshake state and transmits a handshake request Q1 to the master device. The master device listens to the handshake request Q1 within the request scan window W3, and then enters a handshake state according to the handshake request.

In some embodiments, the method of establishing a bluetooth connection further comprises the steps of:

s47: and in the handshake state, if a master handshake packet transmitted by the master equipment is received within the preset handshake time, the Bluetooth connection state is entered.

S48: and under the Bluetooth connection state, transmitting the slave handshake packet to the master device according to the master handshake packet so that the master device enters the Bluetooth connection state according to the slave handshake packet.

S49: in the handshake state, if the master handshake packet transmitted by the master device is not received within the preset handshake time, the identification frame transmitted by the master device is monitored again.

In S47, the preset handshake time may be customized by the designer according to engineering experience. The master handshake package is a handshake package transmitted by the master device and used for informing the slave device of entering a connection state. The Bluetooth connection state is a state of establishing Bluetooth connection according to the connection information. And when the slave device receives the master handshake packet within the preset handshake time, the slave device enters a Bluetooth connection state.

In S48, the slave handshake packet is a handshake packet transmitted by the slave device for notifying the master device of entering the connected state. When the slave device receives the master handshake packet, the slave device may transmit the slave handshake packet to the master device, and when the master device receives the slave handshake packet, the master device enters a bluetooth connection state.

In S49, since the slave device does not receive the master handshake packet within the preset handshake time, in order to avoid the standby time being too long, the slave device listens to the identification frame transmitted by the master device again.

Typically, the connection timeout period specified by the classic bluetooth protocol is 30 seconds, and if the connection process is disturbed, a long wait is entered before resuming the next connection retry. In the embodiment, a short preset handshake time (usually hundreds of milliseconds) is set in the handshake phase, so that a long wait time can be avoided when the handshake is unsuccessful, and thus the monitoring phase of the identification frame can be quickly returned to, and the next connection retry can be quickly performed.

In some embodiments, when the master device enters the handshake state, the master device alternates between transmitting operations of the master handshake packet and receiving operations of the slave handshake packet within a preset handshake time. If the slave handshake packet is received within the preset handshake time, the master device enters a connection state, and if the slave handshake packet is not received within the preset handshake time, the master device retransmits the identification frame.

In some embodiments, the preset handshake time includes a plurality of handshake duration combinations, a sum of times of the plurality of handshake duration combinations being equal to the preset handshake time. Each handshake duration combination comprises a transmission duration of the master handshake packet, a gap duration and a monitoring duration of the slave handshake packet which are arranged in sequence.

The master device alternately executes the transmitting operation of the master handshake packet and the receiving operation of the slave handshake packet within the preset handshake time comprises the following steps: the master device transmits the master handshake package in the ith master handshake package transmitting time, monitors whether the slave handshake package transmitted by the slave device is received in the ith slave handshake package monitoring time after the ith gap time, enters a Bluetooth connection state if the slave handshake package is received, and continues to execute the transmitting operation of the master handshake package and the receiving operation of the slave handshake package if the slave handshake package is not received. The ith master handshake packet transmitting time length, the ith gap time length and the ith slave handshake packet monitoring time length form an ith handshake time length combination.

For example, referring to fig. 10, in the handshake phase, the master device selects the ith master handshake packet transmission duration to transmit the master handshake packet, and listens whether the slave handshake packet is received in the ith slave handshake packet listening duration, where the slave device does not receive the master handshake packet due to factors such as the slave device not being turned on or the signal being weak. And then, the master device selects the (i + 1) th master handshake packet transmission time length to transmit the master handshake packet, and monitors whether the slave handshake packet is received or not in the (i + 1) th slave handshake packet monitoring time length. Until the master device selects the (i + 3) th master handshake packet to transmit the master handshake packet within the transmission duration, the slave device receives the master handshake packet, enters the Bluetooth connection state and returns the slave handshake packet, and the master device receives the slave handshake packet within the (i + 3) th slave handshake packet monitoring duration, so that the master device enters the Bluetooth connection state.

And then, when the slave equipment enters a Bluetooth connection state, controlling the slave equipment to establish Bluetooth connection with the master equipment according to the connection information in a Bluetooth stage.

In some embodiments, determining from the identification frame that the local clock instant of the master device maps to the master clock instant on the time axis of the slave device comprises the steps of:

s421: and calculating the clock offset of the slave equipment relative to the master equipment according to the identification frame.

S422: and determining the local clock time of the master device to be mapped to the master clock time on the time axis of the slave device according to the local clock time and the clock offset of the slave device.

In S421, the clock offset is used to indicate the deviation of the local clock time of the slave device from the master clock time of the master device, where the master clock time is the time mapped to the time axis of the slave device by the local clock time of the master device.

In S422, the slave device may access its own clock module to obtain the local clock time of the slave device. Then, the slave device can determine the master clock time according to the local clock time and the clock offset of the slave device, so that the slave device generates a frequency hopping sequence according to the master clock time and the master Bluetooth address, and controls the slave device to establish Bluetooth connection with the master device according to the frequency hopping sequence and the connection access code.

In some embodiments, calculating the clock offset of the slave device relative to the master device from the identification frame comprises the steps of:

s4211: when receiving the identification frame, determining a starting receiving time, wherein the starting receiving time is the time when the slave device receives the identification frame.

S4212: and determining the initial transmitting time according to the local clock time and the offset time of the master equipment.

S4213: and calculating the clock offset of the slave equipment relative to the master equipment according to the initial transmitting time and the initial receiving time.

In S4211, in some embodiments, determining the start reception time comprises: and determining the receiving time of the synchronous head of the identification frame received by the slave equipment, and determining the initial receiving time according to the receiving time and the data length of the synchronous head.

In S4212, the present embodiment extracts the local clock time CLKN _ t and the Offset time Offset of the host device from the tag frame, and then determines the initial transmission time according to the local clock time CLKN _ t and the Offset time Offset.

In S4213, the present embodiment subtracts the start receiving time from the start transmitting time to obtain the clock offset of the slave device with respect to the master device.

As described above, the identification frame provided in this embodiment includes the master bluetooth address of the master device, the local clock time of the master device, and the offset time, and the slave device can calculate the clock offset in real time to determine the master clock time of the master device. The slave device initiates a handshake request immediately after receiving the identification frame, and enters a handshake phase. Compared with the traditional method that the Bluetooth firstly handshakes through the ID packet and then informs the Bluetooth address and the local clock to the slave equipment through the subsequent FHS packet, the method reduces the process of secondary communication, reduces the possibility of interference and improves the success rate.

Generally speaking, the embodiment enables classic bluetooth connection within tens to hundreds of milliseconds by identifying the frame, thereby accelerating the connection speed and stability and enabling the connection time to be more controllable. By identifying the additional information of the frame, the embodiment can effectively filter invalid equipment, and greatly improve the speed of searching and identifying the equipment.

As another aspect of the embodiments of the present invention, an embodiment of the present invention provides a method for establishing a bluetooth connection, where the method is applied to a master device. The method for establishing the Bluetooth connection comprises the following steps: transmitting an identification frame to the slave equipment so that the slave equipment determines that the local clock time of the master equipment is mapped to the master clock time on the time axis of the slave equipment according to the identification frame, generating connection information according to the master clock time and a master Bluetooth address, and controlling the slave equipment to establish Bluetooth connection with the master equipment according to the connection information, wherein the identification frame comprises the local clock time, offset time and the master Bluetooth address of the master equipment.

In some embodiments, transmitting the identification frame to the slave device comprises: a specified number of predetermined wireless channels per transmission period is determined, wherein the specified number is less than the total number of channels prescribed by the classic bluetooth communication protocol, and an identification frame is transmitted to the slave device over each of the predetermined wireless channels during each transmission period.

In some embodiments, the method of establishing a bluetooth connection further comprises: after each preset wireless channel finishes transmitting the identification frame, a request scanning window is set after the transmission finishing time of the identification frame, and whether a handshake request transmitted by the slave equipment is received or not is monitored in the request scanning window.

In some embodiments, the method of establishing a bluetooth connection further comprises: and when the master equipment does not receive the handshake request transmitted by the slave equipment, the master equipment is controlled to continue transmitting the identification frame.

In some embodiments, the method of establishing a bluetooth connection further comprises: and in the handshake state, alternately executing the transmitting operation of the master handshake packet and the receiving operation of the slave handshake packet in preset handshake time, wherein the slave handshake packet is transmitted by the slave equipment, if the slave handshake packet is received in the preset handshake time, the master equipment is controlled to enter a connection state, and if the slave handshake packet is not received in the preset handshake time, the master equipment is controlled to retransmit the identification frame.

It should be noted that, in the foregoing embodiments, a certain order does not necessarily exist among the steps, and it can be understood by those skilled in the art according to the description of the embodiments of the present invention that, in different embodiments, the steps may have different execution orders, that is, may be executed in parallel, may also be executed interchangeably, and the like.

Referring to fig. 11, fig. 11 is a schematic circuit structure diagram of an earphone according to an embodiment of the present invention. As shown in fig. 11, the headset 110 includes a bluetooth module 111, one or more processors 112, and a memory 113. The processor 112 is respectively connected to the bluetooth module 111 and the memory 113 in a communication manner.

The memory 113, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as program instructions/modules corresponding to the method for establishing a bluetooth connection in the embodiments of the present invention. The processor 112 performs the functions of the method of establishing a bluetooth connection provided by the above-described method embodiments by executing non-volatile software programs, instructions, and modules stored in the memory 113.

The memory 113 may include high speed random access memory and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the memory 113 optionally includes memory located remotely from the processor 112, and such remote memory may be connected to the processor 112 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The program instructions/modules are stored in the memory 113 and, when executed by the one or more processors 112, perform the method of establishing a bluetooth connection in any of the method embodiments described above.

Embodiments of the present invention further provide a storage medium storing computer-executable instructions, which are executed by one or more processors, for example, one of the processors 112 in fig. 11, and enable the one or more processors to perform the method for establishing a bluetooth connection in any of the method embodiments.

The embodiment of the present invention further provides a chip, where the chip includes at least one processor and a memory communicatively connected to the at least one processor, where the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor, so that the at least one processor can execute the method for establishing a bluetooth connection in any of the above method embodiments.

Embodiments of the present invention further provide a computer program product, which includes a computer program stored on a non-volatile computer-readable storage medium, where the computer program includes program instructions, and when the program instructions are executed by an electronic device, the electronic device is caused to execute any one of the tool state monitoring methods.

The above-described embodiments of the apparatus or device are merely illustrative, wherein the unit modules described as separate parts may or may not be physically separate, and the parts displayed as module units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network module units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment may be implemented by software plus a general hardware platform, and may also be implemented by hardware. Based on such understanding, the technical solutions in essence or part contributing to the related art can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the method according to various embodiments or some parts of embodiments.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for establishing Bluetooth connection, which is applied to a slave device, is characterized by comprising the following steps:

according to the identification frame, determining that the local clock time of the master device is mapped to the master clock time on the time axis of the slave device;

2. The method of claim 1, wherein after obtaining the identification frame, further comprising:

controlling the slave device to enter a handshake state;

3. The method of claim 1, further comprising:

in a handshake state, if a master handshake packet transmitted by the master device is received within a preset handshake time, entering a Bluetooth connection state;

and transmitting a slave handshake package to the master device according to the master handshake package in the Bluetooth connection state, so that the master device enters the Bluetooth connection state according to the slave handshake package.

4. The method of claim 1, further comprising:

5. The method according to any one of claims 1 to 4, wherein the determining, according to the identification frame, that the local clock time of the master device is mapped to the master clock time on the time axis of the slave device comprises:

6. The method of claim 5, wherein calculating the clock offset of the slave device relative to the master device based on the identification frame comprises:

7. The method of any of claims 1 to 4, wherein the connection information comprises a connection access code and a frequency hopping sequence, and wherein controlling the slave device to establish a Bluetooth connection with the master device according to the connection information comprises:

calculating a connection access code according to the main Bluetooth address;

8. The method according to any one of claims 1 to 4, wherein the identification frame further comprises connection additional information, and before controlling the slave device to establish a Bluetooth connection with the master device, the method further comprises:

9. The method according to any one of claims 1 to 4, wherein the obtaining the identification frame transmitted by the master device comprises:

10. A method for establishing Bluetooth connection is applied to a main device, and is characterized by comprising the following steps:

11. The method of claim 10, wherein transmitting the identification frame to the slave device comprises:

12. The method of claim 10, further comprising:

and monitoring whether a handshake request transmitted from a device is received or not in the request scanning window.

13. The method of claim 10, further comprising:

14. The method of any one of claims 10 to 13, further comprising:

15. A storage medium having stored thereon computer-executable instructions for causing an electronic device to perform the method of establishing a bluetooth connection as claimed in any one of claims 1 to 9 or 10 to 14.

16. A chip, comprising:

at least one processor; and the number of the first and second groups,

the memory stores instructions executable by the at least one processor to cause the at least one processor to perform the method of establishing a bluetooth connection as claimed in any one of claims 1 to 9 or 10 to 14.

17. An earphone, comprising:

a Bluetooth module;

the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of establishing a bluetooth connection as claimed in any one of claims 1 to 9 or any one of claims 10 to 14.

18. An appliance system, comprising:

a slave device comprising a first bluetooth module, a first processor and a first memory, the at least one first processor being communicatively connected to the first bluetooth module and the first memory, respectively, wherein the first memory stores instructions executable by the at least one first processor, the instructions being executable by the at least one first processor to enable the at least one first processor to perform the method of establishing a bluetooth connection according to any one of claims 1 to 9;

a master device comprising a second bluetooth module, a second processor and a second memory, the at least one second processor being in communication with the second bluetooth module and the second memory, respectively, wherein the second memory stores instructions executable by the at least one second processor, the instructions being executable by the at least one second processor to enable the at least one second processor to perform the method of establishing a bluetooth connection according to any one of claims 10 to 14.