CN115499037A - Bluetooth device, equipment system and channel switching method thereof - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/713—Frequency hopping
- H04B2201/71346—Bluetooth
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The application discloses a Bluetooth device, an equipment system and a channel switching method thereof. The Bluetooth device comprises at least two Bluetooth chips which are coupled with each other, wherein one Bluetooth chip is set as a master Bluetooth chip, and the rest Bluetooth chips are set as slave Bluetooth chips. The equipment system comprises the Bluetooth device and at least two Bluetooth equipment. The channel switching method comprises the following steps: acquiring channel quality information of each Bluetooth device; selecting at least two channels with the same number as at least two Bluetooth devices from preset optional channels; and allocating the selected at least two channels to the communication links corresponding to the at least two Bluetooth devices in a one-to-one correspondence manner. By the mode, when the Bluetooth device is communicated with the at least two Bluetooth devices, the power consumption and the computer resource consumption of the Bluetooth device are effectively reduced.
Description
Technical Field
The present application relates to the field of bluetooth technologies, and in particular, to a bluetooth device, a system thereof, and a channel switching method.
Background
When a bluetooth device is connected to another electronic device via bluetooth, a channel selection method in a bluetooth communication system is usually that one master bluetooth device corresponds to one slave bluetooth device, or one master bluetooth device corresponds to a plurality of slave bluetooth devices. When the bluetooth chip of the main bluetooth device continuously performs frequency hopping to select a channel, the computing resource consumption of the bluetooth chip is increased, and the system power consumption is further increased (the power consumption of the main bluetooth device is accelerated).
Disclosure of Invention
Embodiments of the present application provide a bluetooth device, an apparatus system, and a channel switching method thereof, which enable at least two communication links established by the bluetooth device and at least two bluetooth apparatuses to independently perform frequency hopping, enhance anti-interference capability of the bluetooth device, and reduce power consumption of the system.
In a first aspect, an embodiment of the present application provides a bluetooth apparatus, where the bluetooth apparatus includes at least two bluetooth chips coupled to each other, the at least two bluetooth chips are configured to establish a communication link with at least two bluetooth devices, each bluetooth chip is configured to establish a communication link with at least one bluetooth device, and different bluetooth chips respectively establish communication links with different bluetooth devices. Wherein, one of at least two bluetooth chips sets up to the main bluetooth chip, and remaining bluetooth chip sets up to the slave bluetooth chip. The main Bluetooth chip is used for acquiring channel quality information of the environment where the at least two Bluetooth devices are respectively located, selecting at least two channels with the same number as the at least two Bluetooth devices from preset optional channels based on the acquired channel quality information, and allocating the selected at least two channels to the communication links corresponding to the at least two Bluetooth devices one to one.
In a second aspect, an embodiment of the present application provides a bluetooth device system, where the bluetooth device system includes the bluetooth apparatus and at least two bluetooth devices, and the bluetooth apparatus establishes communication links with the bluetooth apparatus respectively.
In a third aspect, an embodiment of the present application provides a bluetooth channel switching method, which is applied to the bluetooth device described above. The switching method comprises the following steps: acquiring channel quality information of the environment in which at least two Bluetooth devices are respectively located; selecting at least two channels with the same number as at least two Bluetooth devices from preset optional channels based on the acquired channel quality information; and allocating the selected at least two channels to the communication links corresponding to the at least two Bluetooth devices in a one-to-one correspondence manner.
The beneficial effect of this application is: different from the prior art, the bluetooth apparatus provided by the present application includes at least two bluetooth chips coupled to each other, one of the bluetooth chips is a master bluetooth chip, and the other bluetooth chips are slave bluetooth chips, and each bluetooth chip establishes a communication link with a corresponding bluetooth device. And the master Bluetooth chip distributes channels to the Bluetooth devices corresponding to the master Bluetooth chip and the slave Bluetooth chips to independently carry out frequency hopping. The at least two Bluetooth chips are arranged, and the main Bluetooth chip is used for channel allocation, so that when the Bluetooth device is communicated with more than two Bluetooth devices, the defects that the computing resource consumption and the system power consumption of the Bluetooth chip are increased due to the fact that only one Bluetooth chip is used for continuously carrying out frequency hopping are avoided, and the Bluetooth device has a wider application scene.
Drawings
FIG. 1 is a schematic diagram of a system configuration of an embodiment of a Bluetooth device communication system of the present application;
FIG. 2 is a schematic block diagram of a circuit structure of an embodiment of a Bluetooth device of the present application;
FIG. 3 is a diagram illustrating an operation mode of the Bluetooth chip of the Bluetooth device shown in FIG. 2;
fig. 4 is a flowchart illustrating an embodiment of a bluetooth channel switching method of the bluetooth device shown in fig. 2.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.
The following embodiments of the bluetooth device communication system of the present application describe an exemplary architecture of the bluetooth device communication system 10.
Referring to fig. 1, fig. 1 is a schematic diagram of a system configuration of a bluetooth device communication system 10 according to an embodiment of the present application.
The bluetooth device communication system 10 includes a bluetooth apparatus 11 and at least two bluetooth devices 12. At least two bluetooth devices 12 establish communication links with the bluetooth apparatus 11, respectively. After the bluetooth apparatus 11 and the at least two bluetooth devices 12 establish a communication link connection, data transmission such as files, pictures, videos, and audios may be performed respectively. The bluetooth apparatus 11 may also be referred to as a master device, and the at least two bluetooth devices 12 may also be referred to as slave devices. In fig. 1, two bluetooth devices 12 respectively establish two communication links with the bluetooth apparatus 11, and in other embodiments, more than two bluetooth devices 12 respectively establish more than two communication links with the bluetooth apparatus 11.
The bluetooth device 11 may be an electronic device including at least two bluetooth chips, such as a bluetooth adapter, a smart phone, a PC (Personal Computer), a PDA (Personal Digital Assistant or tablet Computer), a printer, and a facsimile. The bluetooth device 12 may be a smart phone, a PC (Personal Computer), a PDA (Personal Digital Assistant or tablet Computer), a bluetooth sound, a bluetooth headset, a bluetooth keyboard, a bluetooth mouse, a bluetooth Digital album, an intelligent vacuum cleaner, an intelligent electric fan, an intelligent robot, an intelligent television, a wearable device worn on a limb or embedded in clothes or accessories, or other electronic devices that can implement a bluetooth function.
The Bluetooth device 11 operates in the 2.4GHz ISM (Industrial Scientific Medical Band) Band. The ISM band is mainly open to the major fields of industry, science and medicine, and the frequency band is 2.400-2483.5GHz. Bluetooth divides the ISM band into smaller channels, also called channels (channels), which are data signal transmission channels using radio electromagnetic waves as transmission carriers. The bluetooth apparatus 11 communicates with at least two bluetooth devices 12 on different channels, respectively. The bluetooth apparatus 11 and the at least two bluetooth devices 12 communicate with each other through a Frequency-Hopping Spread Spectrum (FHSS). Frequency hopping refers to a method of spreading a spectrum by using a pseudo-random code sequence to perform frequency shift keying so that a carrier frequency is continuously hopped. That is, the master and slave devices that communicate use the same channel.
ISM belongs to the unlicensed (Free License) frequency band, which is used by most wireless local area networks, zigBee, some cordless phones, and some military or civil communications, and radio waves of, for example, microwave ovens and high pressure sodium lamps are also in this frequency range. If various devices are in the operating environment of ISM band, the bluetooth apparatus 11 is easily subjected to electromagnetic interference during communication. To overcome the interference, the bluetooth technology further uses an Adaptive Frequency Hopping (AFH) technology for communication. Adaptive frequency hopping refers to adding frequency adaptive control and power adaptive control in addition to the functions necessary for conventional frequency hopping (frequency hopping techniques as described above) communications. In the frequency self-adaptive control, the interfered frequency point in the frequency hopping frequency set is removed from the frequency hopping map in the frequency hopping communication process, so that the frequency hopping communication is carried out on the non-interfered usable frequency point, and the quality of receiving signals in the frequency hopping communication is greatly improved. The power adaptive control means that in an adaptive frequency hopping system, each master device and each slave device mutually obtain reliable communication with the minimum transmission power so as to increase the concealment of the system as much as possible.
The bluetooth apparatus 11 can establish at least two communication links with at least two bluetooth devices 12 in the ISM band, and perform radio electromagnetic wave communication through the adaptive frequency hopping switching channel on the at least two communication links, thereby avoiding the disadvantage of performing blind frequency hopping communication on multiple channels, such as electromagnetic wave interference of other devices.
The Bluetooth Special Interest Group (SIG) has evolved different Bluetooth protocol version specifications from the first formal version 1.0A to the subsequent versions 1.1, 2.0, 3.0, 4.0, 5.0, 5.2, etc. in 1999. Where version 4.0 was previously referred to as the classic bluetooth version and version 4.0 was later referred to as the Low Energy (LE) bluetooth version. Bluetooth devices supporting different bluetooth protocol versions all use the 2.4GHz ISM band. But differs in that different bluetooth version protocols divide the operating frequency of the bluetooth device into different channels. The operating frequency of a device supporting the classic bluetooth protocol (e.g., prior to release 4.0) is divided into 79 channels in the ISM frequency range, each occupying a 1MHz bandwidth. While the operating frequency of devices supporting LE mode (e.g., after release 4.0) is divided into 40 channels in the ISM frequency range, each occupying a 2MHz bandwidth. The number of channels supporting the bluetooth low energy mode is reduced by half at the same total bandwidth. At certain transmission rates, the bluetooth low energy version reduces the signal-to-noise ratio requirement by increasing the channel bandwidth. The 40 channels defined by the bluetooth low energy version are divided into three types: broadcast (advertising), periodic (periodic) and data (data) channels. The broadcast channel uses all 40 channels to discover devices, initiate connections, and broadcast data. Of which 3 channels, called primary broadcast channels, are used for initial broadcast and all conventional broadcast activities; the remaining 37 channels are referred to as secondary broadcast channels and are primarily used for data communication. The bluetooth low energy version of the protocol can thus use 37 channels for frequency hopping communications. The classic bluetooth version protocol is different from bluetooth low energy and does not distinguish between broadcast channels, periodic channels and data channels. The classic bluetooth version of the protocol can thus use 79 channels for frequency hopping communications.
In some embodiments, the bluetooth device communication system 10 includes a bluetooth apparatus 11 and at least two bluetooth devices 12, and the bluetooth apparatus 11 and the at least two bluetooth devices 12 each support a bluetooth protocol that is a classic bluetooth version. In this case, the bluetooth apparatus 11 and the at least two bluetooth devices 12 perform adaptive frequency hopping communication in 79 channels. In other embodiments, the bluetooth apparatus 11 and the at least two bluetooth devices 12 included in the bluetooth device communication system 10 may also support a bluetooth protocol of a bluetooth low energy version. In this case, the bluetooth apparatus 11 and the at least two bluetooth devices 12 perform adaptive frequency hopping communication in 37 channels. Of course, in some embodiments, the bluetooth apparatus 11 and the at least two bluetooth devices 12 included in the bluetooth device communication system 10 may support the bluetooth protocol of the classic bluetooth version and the bluetooth protocol of the low power bluetooth version, respectively. For example, the bluetooth apparatus 11 supports both the bluetooth protocol of the classic bluetooth version and the bluetooth protocol of the low power bluetooth version, while one of the bluetooth devices 12 may support the bluetooth protocol of the classic bluetooth version and the remaining bluetooth devices 12 may support the bluetooth protocol of the low power bluetooth version. In this case, the bluetooth apparatus 11 and one of the bluetooth devices 12 perform adaptive frequency hopping communication in 79 channels, and the remaining bluetooth devices 12 perform adaptive frequency hopping communication in 37 channels.
Referring to fig. 2, fig. 2 is a schematic block diagram of a circuit structure of an embodiment of a bluetooth device 11 according to the present application.
The bluetooth apparatus 11 comprises at least two bluetooth chips 111 coupled to each other, and the at least two bluetooth chips 111 are used for establishing a communication link with one of the at least two bluetooth devices 12. Each bluetooth chip 111 is configured to establish a communication link with at least one bluetooth device 12, and different bluetooth chips 111 establish communication links with different bluetooth devices 12. Among them, one of at least two bluetooth chips 111 is set as a master bluetooth chip 1111, and the remaining bluetooth chips 111 are set as slave bluetooth chips 1112. The master bluetooth chip 1111 is configured to at least acquire channel quality information of an environment in which the at least two bluetooth devices 12 are respectively located, select at least two channels having the same number as the at least two bluetooth devices 12 from preset selectable channels based on the acquired channel quality information, and allocate the selected at least two channels to communication links corresponding to the at least two bluetooth devices 12 in a one-to-one correspondence manner.
The bluetooth chip 111 is an SOC (system on chip) system of the bluetooth device 11, and may include a Central Processing Unit (CPU), which is a core for operation and control of the bluetooth device 11 and is a final execution Unit for information Processing and program operation. The bluetooth chip 111 may be an integrated circuit chip having an adaptive frequency hopping control function. Bluetooth chip 111 may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the like. The master bluetooth chip 1111 and the slave bluetooth chip 1112 may be any SOC that implements the same function. Of course, the master bluetooth chip 1111 may be any SOC that implements more functions and executes more complex instructions, and the slave bluetooth chip 1112 may implement more simple functions than the master bluetooth chip 1111. In one embodiment, the bluetooth device 11 is provided with two bluetooth chips 111, one of which is provided as a master bluetooth chip 1111 and the other is a slave bluetooth chip 1112. In other embodiments, the bluetooth apparatus 11 may further include other numbers of bluetooth chips 111, such as 3, 4, etc. When the bluetooth device 11 is provided with other numbers of bluetooth chips 111, one of the bluetooth chips is a master bluetooth chip 1111, and the rest is a slave bluetooth chip 1112. In other words, when the bluetooth device 11 sets the number of the bluetooth chips 111 to be greater than two, there is only one master bluetooth chip 1111, and the rest are slave bluetooth chips 1112. For example, when the number of the bluetooth chips 111 is 3, one of the bluetooth chips is set as the master bluetooth chip 1111, and the remaining two bluetooth chips are the slave bluetooth chips 1112.
Optionally, the at least two bluetooth chips 111 may be electrically connected through an I2C or SPI connection. The I2C bus is a bidirectional two-wire synchronous serial bus. The I2C bus consists of two wires: serial Data (SDA) and Serial Clock (SCL). Corresponding pins of at least two bluetooth chips 111 are connected to these two wires, thereby forming a small network. The I2C bus supports three transmission modes. Can reach 100kbit/s under the standard mode; can reach 400kbit/s under the fast mode; and 3.4Mbit/s can be achieved in the high-speed mode. The outputs of at least two bluetooth chips 111 connected to the I2C bus are designed with open drains or open collectors, and perform wired-and logic. The low level of I2C represents 0 and the high level represents 1. When the plurality of bluetooth chips 111 simultaneously transmit data on the bus, if one of the bluetooth chips is 0, the bus is 0. When SCL is in high level, SDA data is effective, and sampling can be carried out; when SCL is low, SDA is operated for level shifting. The SPI (Serial Peripheral Interface) is a high-speed full-duplex synchronous communication bus, and occupies only four wires on the pins of the chip, thereby saving the pins of the chip and saving space on the layout of the circuit board. The SPI interface typically uses 4 wires: the device comprises a serial clock line, a master input/slave output data line, a master output/slave input data line and a low-level effective slave selection line.
Specifically, the bluetooth device 11 further includes at least one radio frequency circuit 112. The at least two bluetooth chips 111 are respectively coupled to the at least one rf circuit 112. In some embodiments, the bluetooth apparatus 11 may further set the number of the radio frequency circuits 112 to be equal to at least two bluetooth chips 111, and one radio frequency circuit 112 is correspondingly connected to one bluetooth chip 111. For example, the bluetooth device 11 may be provided with three bluetooth chips 111 and three radio frequency circuits 112. In other embodiments, the number of the radio frequency circuit 112 provided in the bluetooth apparatus 11 may be different from the number of the at least two bluetooth chips 111.
The radio frequency circuitry 112 may include radio frequency receive circuitry 1121 and radio frequency transmit circuitry 1122. The rf receiving circuit 1121 mainly performs filtering, mixing demodulation, decoding, and other processing on the received rf signal. The rf transmitting circuit 1122 mainly performs modulation, transmission conversion, power amplification on the transmitted rf signal, and transmits the rf signal through an antenna. When the bluetooth apparatus 11 communicates with at least two bluetooth devices 12, the bluetooth apparatus 11 continuously changes the used channel through the radio frequency circuit 112, and the at least two connected bluetooth devices 12 follow the same channel change rule so that the bluetooth apparatus 11 and the at least two bluetooth devices 12 communicate on the same channel.
Optionally, the bluetooth device 11 further comprises at least one memory 113. The at least one memory 113 is coupled to the at least two bluetooth chips 111, respectively. The memory 113 is used for storing various types of instructions, data, and other information. The memory 113 may be located outside the bluetooth chip 111, or may be integrated into one of the bluetooth chips 111, or each bluetooth chip 111 may be integrated with the memory 113. In some embodiments, the bluetooth apparatus 11 may further set the number of the memories 113 to be identical to at least two bluetooth chips 111. For example, the bluetooth device 11 may be provided with three bluetooth chips 111 and three memories 113. In other embodiments, the memory 113 provided in the bluetooth apparatus 11 may be different from the number of the at least two bluetooth chips 111. For example, the bluetooth device 11 is provided with only one memory 113, and all the bluetooth chips 111 share one memory 113.
Alternatively, when the number of the at least two bluetooth chips 111 and the radio frequency circuits 112 provided by the bluetooth device 11 is the same (i.e., the same), the master bluetooth chip 1111 and the remaining slave bluetooth chips 1112 thereof correspond to one radio frequency circuit 112 respectively. The radio frequency circuits 112 are arranged in accordance with the number of the bluetooth chips 111, so that the master bluetooth chip 1111 and the slave bluetooth chip 1112 can independently perform adaptive frequency hopping communication. For example, in one embodiment, the bluetooth device communication system 10 includes a bluetooth apparatus 11 and two bluetooth devices 12. Wherein the bluetooth arrangement 11 supports both the bluetooth protocol of the classic bluetooth version and the bluetooth protocol of the low-power bluetooth version. While one of the bluetooth devices 12 may support the classic bluetooth version of the bluetooth protocol and the other bluetooth device 12 may support the low power bluetooth version of the bluetooth protocol. The bluetooth device 11 is provided with two bluetooth chips 111 and two rf circuits 112, wherein one of the bluetooth chips is a master bluetooth chip 1111, the master bluetooth chip 111 corresponds to one rf circuit 112, the other bluetooth chip 1112, and the slave bluetooth chip 111 corresponds to the other rf circuit 112. The master bluetooth chip 1111 of the bluetooth apparatus 11 performs adaptive frequency hopping communication in 79 channels with one of the bluetooth devices 12 through the corresponding radio frequency circuit 112, and the slave bluetooth chip 1112 of the bluetooth apparatus 11 performs adaptive frequency hopping communication in 37 channels with the other bluetooth device 12 through the corresponding radio frequency circuit 112.
Further, the current master bluetooth chip 1111 is configured to notify one of the slave bluetooth chips 1112 as a master bluetooth chip and the current master bluetooth chip 1111 as a slave bluetooth chip 1112 when the preset operation saturation state is reached. In this case, the slave bluetooth chip 1112 and the master bluetooth chip 1111 may be SOCs implementing the same function. The master bluetooth chip 1111 and the slave bluetooth chip 1112 are configured to be switchable, so that all bluetooth chips 111 can be fully utilized, and the processing efficiency of the bluetooth chip 111 and the fault tolerance and recovery capability after the master bluetooth chip 1111 fails are improved.
For example, in an application scenario, the bluetooth device communication system 10 includes a bluetooth apparatus 11 and three bluetooth devices 12, the bluetooth apparatus 11 is a smart phone, and the three bluetooth devices 12 are a bluetooth headset, a smart television and a smart printer, respectively. The intelligent mobile phone supports both the Bluetooth protocol of the classic Bluetooth version and the Bluetooth protocol of the low-power Bluetooth version, the Bluetooth earphone can support the Bluetooth protocol of the classic Bluetooth version, and the intelligent television and the intelligent printer can support the Bluetooth protocol of the low-power Bluetooth version. The smart phone is provided with two bluetooth chips 111 and two radio frequency circuits 112, wherein one of the two bluetooth chips 111 is a master bluetooth chip 1111, the master bluetooth chip 111 corresponds to one radio frequency circuit 112, the other bluetooth chip 1112 is a slave bluetooth chip 1112, and the slave bluetooth chip 111 corresponds to the other radio frequency circuit 112. The master bluetooth chip 1111 of the smart phone communicates with the bluetooth headset and the smart television at 79 and 37 channels at intervals, and the slave bluetooth chip 1112 of the smart phone communicates with the smart printer at 37 channels through the corresponding radio frequency circuit 112. The smart phone establishes a communication link with the bluetooth headset and the smart television and transmits audio and video uninterruptedly, and the slave bluetooth chip 1112 only establishes a communication link with the smart printer and transmits data uninterruptedly, so that the master bluetooth chip 1111 reaches a preset operation saturation state. In this case, the master bluetooth chip 1111 of the smart phone informs the other slave bluetooth chip 1112 as the master bluetooth chip 1111 (i.e., the slave bluetooth chip 1111 before switching establishes a communication link with the bluetooth headset after switching in addition to the communication link with the smart printer), and the current master bluetooth chip 1111 as the slave bluetooth chip 1112 (i.e., the master bluetooth chip 1111 before switching establishes a communication link with only the smart tv after switching).
Referring to fig. 3, fig. 3 is a schematic diagram of an embodiment of an operating mode of the bluetooth chip 111 of the bluetooth device 11 shown in fig. 2.
The master bluetooth chip 1111 is configured to obtain channel quality information of an environment in which each slave bluetooth chip 1112 is located and channel quality information of an environment in which each of the at least two bluetooth devices 12 is located, so as to select at least two channels.
The channel quality information is obtained by performing comprehensive evaluation calculation on a Packet Loss Rate (PLR), a Received Signal Strength (RSSI), a Cyclic Redundancy Check (CRC), a Hybrid Error Correction (HEC), and a Forward Error Correction (FEC). The packet loss rate is defined as the rate that has been processed by the link layer of the transmitting end but has not been successfully transmitted to an upper SDU (Service Data Unit) by the receiving end, and therefore, the packet loss rate parameter actually represents the upper limit of the packet loss rate under the non-congestion condition. The received signal strength is a received signal strength indicator, and the distance between a signal point and a receiving point is measured according to the strength of the received signal, so that positioning calculation is carried out according to corresponding data to judge the connection quality and judge whether to increase the broadcast transmission strength. It is implemented after the reverse channel baseband receive filter. It decays with increasing distance, usually negative, with values closer to zero indicating higher signal strength. The received signal strength is continuously too low, which means that the uplink signal received by the master device is too weak, which may result in demodulation failure. The strength of the received signal is continuously too high, which means that the received uplink signals are too strong, and the mutual interference is too large, which also affects the signal demodulation. Cyclic redundancy error correction is a channel coding technique that generates a short fixed bit check code from data, such as network packets or computer files, and is used primarily to detect or check errors that may occur after data transmission or storage. It uses the principle of division and remainder to detect the error. Forward error correction provides automatic error correction and error detection capability for originating transmissions. After receiving the code, the receiving end checks the error condition, if the error is within the error correction capability range of the code, the error is automatically corrected, if the error exceeds the error correction capability of the code, but can be detected, the receiving end requests the transmitting end to retransmit through a feedback channel. The mixed error correction mode is a compromise between forward error correction and error detection retransmission mode in the aspects of real-time performance and decoding complexity, and can achieve a lower error rate and be more suitable for a high-speed data transmission system with large loop delay. Forward error correction is an error control method, which refers to a technique that a signal is encoded according to a certain algorithm before being sent into a transmission channel, a redundant code with the characteristics of the signal is added, and the received signal is decoded at a receiving end according to a corresponding algorithm, so that an error code generated in the transmission process is found out and corrected. Before the connection between the bluetooth apparatus 11 and the bluetooth device 12 is performed, information between both parties is exchanged according to a Link Manager Protocol (LMP). The link management protocol information includes the minimum number of channels to be used by the bluetooth device 11 and the bluetooth apparatus 12. Each channel is evaluated according to the gate limit of packet loss rate, cyclic redundancy error correction of payload, hybrid error correction, forward error correction error parameters. The bluetooth device 12 also automatically detects crc errors of the data packets when measuring crc errors, and determines whether the data packets are correct. The bluetooth device 11 forms a classification table according to the format of the link management protocol, and then the frequency hopping of the bluetooth device 11 is performed according to the classification table. The bluetooth apparatus 11 notifies all bluetooth devices 12 through a link management protocol command, exchanges channel quality information, and the channels are divided into good channels, bad channels, and unused channels. The bluetooth device 11 determines which channels are available and which are not. Since there is a sudden interference in the environment, the classification table of the frequency hopping is periodically updated and the mutual communication between the bluetooth device 11 and the bluetooth apparatus 12 is performed in time.
Further, the master bluetooth chip 1111 is configured to obtain channel quality information of an environment where the master bluetooth chip 1111 is located, channel quality information of an environment where each slave bluetooth chip 1112 is located, and channel quality information of an environment where each of the at least two bluetooth devices 12 is located. That is, in addition to acquiring the channel quality information of the environment in which each slave bluetooth chip 1112 is located and the channel quality information of the environment in which each of the at least two bluetooth devices 12 is located, the master bluetooth chip 1111 may also acquire the channel quality information of the environment in which it is located for selecting the at least two channels.
In one embodiment, the bluetooth device communication system 10 comprises a bluetooth apparatus 11 and two bluetooth devices 12, wherein the bluetooth apparatus 11 and the two bluetooth devices 12 both support a bluetooth protocol of the bluetooth low energy version. The bluetooth device 11 is provided with two bluetooth chips 111 and two rf circuits 112, wherein one of the bluetooth chips is a master bluetooth chip 1111, the master bluetooth chip 111 corresponds to one rf circuit 112, the other bluetooth chip 1112, and the slave bluetooth chip 111 corresponds to the other rf circuit 112. The master bluetooth chip 1111 of the bluetooth apparatus 11 obtains four pieces of channel quality information, which are the channel quality information of the environment where the master bluetooth chip 1111 is located, the channel quality information of the environment where the slave bluetooth chip 1112 is located, and the channel quality information of the two bluetooth devices 12. The bluetooth apparatus 11 selects two channels from the 37 channels in which the master bluetooth chip 111 communicates with one of the bluetooth devices 12, wherein one channel is allocated to the communication link corresponding to the master bluetooth chip 1111, and the other channel is allocated to the communication link corresponding to the slave bluetooth chip 1112 and the other bluetooth device 12.
Specifically, before the master bluetooth chip 111 acquires the channel quality information of the environment where the master bluetooth chip is located, the channel quality information of the environment where each slave bluetooth chip is located, and the channel quality information of the environment where each of the at least two bluetooth devices is located, each slave bluetooth chip 1112 may receive the channel quality information of the environment where it is located, which is sent by the corresponding bluetooth device 12, and acquire the channel quality information of the environment where it is located, and send each channel quality information that it receives and acquires to the master bluetooth chip 1111.
For example, in the present embodiment, the bluetooth device 11 is provided with one master bluetooth chip 1111 and one slave bluetooth chip 1112. There are two bluetooth devices 12 to be connected to the bluetooth arrangement 11. The bluetooth apparatus 11 and the bluetooth device 12 both support the bluetooth protocol of the bluetooth low energy version. Further, the slave bluetooth chip 1112 receives the channel quality information of the environment where the corresponding bluetooth device 12 is located, acquires the channel quality information of the environment where the slave bluetooth device is located, and sends the two pieces of channel quality information to the master bluetooth chip 1111. The master bluetooth chip 1111 receives the channel quality information of its own environment transmitted from the bluetooth chip 1112 and the channel quality information of the environment in which its corresponding bluetooth device 12 is located. The master bluetooth chip 1111 obtains the channel quality information of the environment where it is located and the channel quality information of the environment where its corresponding bluetooth device 12 is located. In other words, the master bluetooth chip 1111 acquires four pieces of channel quality information. The master bluetooth chip 1111 selects two channels from the 37 channels according to the four channel quality information, and allocates the two selected channels to the respective communication links established by the bluetooth device 12 corresponding to the master bluetooth chip 1111 and the bluetooth device 12 corresponding to the slave bluetooth chip 1112 in a one-to-one correspondence.
Referring to fig. 3, the master bluetooth chip 1111 is configured to generate a channel allocation notification after selecting at least two channels, where the channel allocation notification is used to indicate that the selected at least two channels are allocated to the communication links corresponding to the at least two bluetooth devices 12 in a one-to-one correspondence.
Specifically, the master bluetooth chip 1111 is configured to send a channel allocation notification to each slave bluetooth chip 1112. The master bluetooth chip 1111 is configured to send a channel assignment notification assigned for its corresponding communication link to the corresponding bluetooth device 12, so that the bluetooth device 12 hops to one of the at least two assigned channels in the corresponding communication link. The master bluetooth chip 1111 may send the channel allocation notification to each slave bluetooth chip 1112 through an I2C or SPI circuit. The master bluetooth chip 1111 notifies the corresponding bluetooth device 12 of a channel allocation notification through a PDU (Protocol Data Unit) of an adaptive frequency hopping request (LMP _ set _ AFH), so that the bluetooth device 12 hops to the allocated channel in the corresponding communication link. The Protocol Data Unit PDU (Protocol Data Unit) refers to a Data Unit transmitted between peer layers. The PDU of the physical layer of the PDU is a data bit (bit), the PDU of the data link layer is a data frame (frame), the PDU of the network layer is a data packet (packet), the PDU of the transport layer is a data segment (segment), and the other PDU of the higher layer is data (data). The PDU in which the master bluetooth chip 1111 notifies the corresponding bluetooth device 12 of the channel allocation notification may be a packet.
Further, the slave bluetooth chip 1112 is configured to, upon receiving the channel assignment notification, notify the corresponding bluetooth device 12 of the assigned channel through the PDU of the adaptive frequency hopping request for its corresponding communication link, so that the bluetooth device 12 hops to another of the assigned at least two channels in the corresponding communication link.
With continued reference to fig. 3, the main bluetooth chip 1111 is optionally configured to select at least two channels with the signal quality at the front among the preset alternative channels based on the acquired channel quality information. The signal quality of the main bluetooth chip 1111 is located in at least two channels in the front row, which is convenient for the bluetooth apparatus 11 to effectively resist interference when performing frequency hopping communication with at least two bluetooth devices 12.
Further, the master bluetooth chip 1111 is configured to allocate the best signal quality of the at least two channels to the communication link corresponding to the master bluetooth chip 1111, and allocate the remaining channels of the at least two channels to the communication links corresponding to the slave bluetooth chips 1112, respectively. Since the main bluetooth chip 1111 is generally used to perform a main task of the bluetooth device 11, one of at least two channels having the best signal quality is allocated to a communication link corresponding to the main bluetooth chip 1111, so that the main bluetooth chip 1111 can perform more efficient communication.
Specifically, the main bluetooth chip 1111 performs comprehensive evaluation calculation by the acquired channel quality information through packet loss rate, received signal strength, cyclic redundancy error correction, hybrid error correction, and forward error correction, and divides the channel into a good channel, a bad channel, and an unused channel. The master bluetooth chip 1111 determines those channels are available, and after those channels are unavailable, assigns the best signal quality one of the at least two channels to the communication link corresponding to the master bluetooth chip 1111, and assigns the remaining channels of the at least two channels to the communication links corresponding to the slave bluetooth chips 1112, respectively. Since there will be burst interference in the environment, the master bluetooth chip 1111 periodically updates the classification table of frequency hopping. For example, after a certain period of time, the master bluetooth chip 1111 re-performs the evaluation calculation by the acquired channel quality information, so that the bluetooth device 11 and the bluetooth apparatus 12 perform the frequency hopping communication between the high quality channels.
Referring to fig. 4, fig. 4 is a flowchart illustrating an embodiment of a bluetooth channel switching method of the bluetooth device 11 shown in fig. 2.
Step S11: and acquiring the channel quality information of the environment in which the at least two Bluetooth devices are respectively positioned.
Specifically, the bluetooth apparatus 11 may acquire channel quality information of an environment in which it is located and channel quality information of an environment in which the corresponding bluetooth device 12 is located through the master bluetooth chip 1111 and the slave bluetooth chip 1112. Step S11 may include the following specific steps:
s111: and acquiring the channel quality information of the environment where the Bluetooth equipment corresponding to the slave Bluetooth chip is located.
Specifically, channel quality information of the environment in which the corresponding bluetooth device 12 with which the link connection is established is located is acquired from the bluetooth chip 1112.
S112: and acquiring the channel quality information of the environment where the slave Bluetooth chip is located.
Among them, the bluetooth chip 111 that acquires the channel quality information of the environment where the slave bluetooth chip 1112 is located is the master bluetooth chip 1112.
S113: and the slave Bluetooth chip sends the received and acquired channel quality information to the master Bluetooth chip.
That is, the slave bluetooth chip 1112 transmits both the channel quality information of its own environment and the channel quality information of the bluetooth device 12 with which a communication link is established to the master bluetooth chip 1111.
S114: and acquiring the channel quality information of the environment where the Bluetooth equipment corresponding to the main Bluetooth chip is located.
Specifically, the master bluetooth chip 1111 acquires channel quality information of the corresponding bluetooth device 12 with which the link connection is established.
S115: and acquiring the channel quality information of the environment where the main Bluetooth chip is located.
The bluetooth chip 111 that acquires the channel quality information of the environment where the master bluetooth chip 1111 is located is the master bluetooth chip 1111.
Therefore, the master bluetooth chip 1111 acquires the channel quality information of its own environment, the channel quality information of the environment in which the slave bluetooth chip 1112 is located, and the channel quality information of the environment in which each of the at least two bluetooth devices 12 is located. For example, when the bluetooth device communication system 10 includes a bluetooth apparatus 11 and two bluetooth devices 12. The bluetooth device 11 is provided with two bluetooth chips 111, one of which is set as a master bluetooth chip 1111, and the other is a slave bluetooth chip 1112. In this case, the master bluetooth chip acquires four pieces of channel quality information in total. In other embodiments, for example, when the bluetooth device communication system 10 includes the bluetooth apparatus 11 and three bluetooth devices 12, wherein the bluetooth apparatus 11 is provided with two bluetooth chips 111, the master bluetooth chip 1111 acquires five pieces of channel quality information in total.
Step S12: and selecting at least two channels with the same number as the at least two Bluetooth devices from the preset optional channels based on the acquired channel quality information.
Specifically, the master bluetooth chip 1111 selects at least two channels, which are the same as the number of the at least two bluetooth devices 12, according to the total channel quality information it acquires. Wherein, the at least two channels may be two channels with optimal quality comprehensively evaluated through packet loss rate, received signal strength, cyclic redundancy error correction, hybrid error correction and forward error correction. For example, the bluetooth device communication system 10 includes a bluetooth apparatus 11 and two bluetooth devices 12, and the bluetooth apparatus 11 and the two bluetooth devices 12 each support a bluetooth low energy version protocol. The bluetooth device 11 is provided with two bluetooth chips 111, one of which is set as a master bluetooth chip 1111, and the other is a slave bluetooth chip 1112. In this case, the main bluetooth chip 1111 acquires four pieces of channel quality information in total, and the main bluetooth chip 1111 selects two channels having the best quality among the 37 channels.
Step S13: and allocating the selected at least two channels to the communication links corresponding to the at least two Bluetooth devices in a one-to-one correspondence manner.
Specifically, the bluetooth device 11 may perform step S13 by specifically:
step S131: and allocating the optimal channel to the Bluetooth device corresponding to the main Bluetooth chip.
The bluetooth device 11 assigns an optimal channel of at least two channels to the corresponding bluetooth apparatus 12 that establishes a communication link with the master bluetooth chip 1111 through the master bluetooth chip 1111 to perform communication.
Step S132: and allocating the suboptimal channel to the Bluetooth device corresponding to the slave Bluetooth chip.
The bluetooth apparatus 11 allocates the remaining suboptimal channel of the at least two channels to the corresponding bluetooth device 12 that establishes the communication link with the slave bluetooth chip 1112 through the master bluetooth chip 1111 to communicate. When the main bluetooth chip 1111 reaches the preset operation saturation state, the following steps may be performed:
step S133: and informing one of the slave Bluetooth chips to be used as a master Bluetooth chip, and informing the current master Bluetooth chip to be used as a slave Bluetooth chip.
Alternatively, the bluetooth device 11 is provided with one master bluetooth chip 1111 and a plurality of slave bluetooth chips 1112. When the master bluetooth chip 1111 reaches the preset operation saturation state, one of the slave bluetooth chips 1112 having the lowest processing frequency may be used as the master bluetooth chip 1111. Thus, the utilization rate of all the bluetooth chips 111 can be improved.
For example, when the bluetooth device communication system 10 includes the bluetooth apparatus 11 and the three bluetooth devices 12, the bluetooth apparatus 11 and the three bluetooth devices 12 each support a classic bluetooth version protocol. The bluetooth device 11 is provided with three bluetooth chips 111, one of which is set as a master bluetooth chip 1111, and the other two of which are slave bluetooth chips 1112. In this case, the master bluetooth chip 1111 acquires six pieces of channel quality information in total, and the master bluetooth chip 1111 selects three channels having the best quality among the 79 channels. The master bluetooth chip 1111 may allocate the best channel of the three channels to the bluetooth device 12 corresponding to the master bluetooth chip 1111, allocate a second best channel of the three channels to the bluetooth device 12 corresponding to the slave bluetooth chip 1112, and allocate the third best channel of the three channels to the bluetooth device 12 corresponding to another slave bluetooth chip 1112. When the master bluetooth chip 1111 is operating in saturation, one of the slave bluetooth chips 1112 having the lowest processing frequency is selected as the master bluetooth chip 1111. And the current master bluetooth chip 1111 becomes the slave bluetooth chip 1112.
To sum up, the bluetooth device 11 provided by the present application is provided with at least two bluetooth chips 111, one of which is a master bluetooth chip 1111, and the rest are slave bluetooth chips 1112. Each bluetooth chip 111 establishes a communication link with a corresponding bluetooth device 12, respectively. The bluetooth device 12 corresponding to the master bluetooth chip 1111 and each slave bluetooth chip 1112 is allocated with a channel by the master bluetooth chip 1111 to perform frequency hopping independently, so as to avoid the computer resource consumption and system power consumption increased by only arranging a single bluetooth chip 111 to perform frequency hopping. And the anti-interference capability of the communication process can be improved when each communication link independently carries out frequency hopping on each channel.
The above description is only an example of the present application, and is not intended to limit the scope of the present application, and all equivalent structures or equivalent processes performed by the present application and the contents of the attached drawings, which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A bluetooth apparatus, comprising at least two bluetooth chips coupled to each other, wherein the at least two bluetooth chips are configured to establish a communication link with at least two bluetooth devices, each bluetooth chip is configured to establish the communication link with at least one bluetooth device, and different bluetooth chips respectively establish the communication links with different bluetooth devices;
wherein, one of the at least two Bluetooth chips is set as a master Bluetooth chip, and the rest Bluetooth chips are set as slave Bluetooth chips; the main Bluetooth chip is used for at least acquiring channel quality information of the environment where the at least two Bluetooth devices are respectively located, selecting at least two channels with the same number as the at least two Bluetooth devices from preset optional channels based on the acquired channel quality information, and allocating the selected at least two channels to the communication links corresponding to the at least two Bluetooth devices in a one-to-one correspondence manner.
2. The Bluetooth device of claim 1,
the master bluetooth chip is configured to at least obtain the channel quality information of the environment in which each of the slave bluetooth chips is located and the channel quality information of the environment in which each of the at least two bluetooth devices is located, so as to select the at least two channels.
3. The Bluetooth device of claim 2,
the master bluetooth chip is configured to obtain the channel quality information of an environment in which the master bluetooth chip is located, the channel quality information of an environment in which each of the slave bluetooth chips is located, and the channel quality information of an environment in which each of the at least two bluetooth devices is located, so as to select the at least two channels.
4. The Bluetooth device of claim 2,
each slave bluetooth chip is configured to receive the channel quality information of the environment where the corresponding bluetooth device is located, acquire the channel quality information of the environment where the slave bluetooth chip is located, and send each piece of the received and acquired channel quality information to the master bluetooth chip.
5. The Bluetooth device of claim 1,
the main Bluetooth chip is used for generating a channel allocation notice after the at least two channels are selected, and the signal allocation channel is used for indicating that the selected at least two channels are allocated to the communication links corresponding to the at least two Bluetooth devices in a one-to-one correspondence manner;
the master Bluetooth chip is used for sending the channel allocation notification to each slave Bluetooth chip; the main Bluetooth chip is used for sending the channel allocation notice allocated to the corresponding communication link to the corresponding Bluetooth device, so that the Bluetooth device hops to one of the at least two allocated channels in the corresponding communication link;
the slave Bluetooth chip is configured to send the channel allocation notification allocated to the corresponding communication link to the corresponding Bluetooth device after receiving the channel allocation notification, so that the Bluetooth device hops to another of the at least two allocated channels in the corresponding communication link.
6. The Bluetooth device of claim 1,
the master bluetooth chip is configured to allocate one of the at least two channels with the best signal quality to the communication link corresponding to the master bluetooth chip, and allocate the remaining channels of the at least two channels to the communication links corresponding to the slave bluetooth chips, respectively.
7. The Bluetooth device of claim 1,
the current master Bluetooth chip is used for informing one of the slave Bluetooth chips to be used as a master Bluetooth chip when a preset working saturation state is reached, and the current master Bluetooth chip is used as a slave Bluetooth chip.
8. The Bluetooth device of claim 1,
the channel quality information is obtained by carrying out comprehensive evaluation calculation through packet loss rate, received signal strength, cyclic redundancy error correction, hybrid error correction and forward error correction.
9. A bluetooth device system, comprising:
the bluetooth device of any one of claims 1-8;
and the at least two Bluetooth devices are respectively used for establishing communication links with the Bluetooth device.
10. A bluetooth channel switching method, applied to the bluetooth device according to any one of claims 1-8, the method comprising:
acquiring channel quality information of the environment in which at least two Bluetooth devices are respectively located;
selecting at least two channels with the same number as the at least two Bluetooth devices from preset optional channels based on the acquired channel quality information;
and correspondingly allocating the selected at least two channels to the communication links corresponding to the at least two Bluetooth devices.
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