CN115277323A - Data frame transmission method, device, chip, storage medium and Bluetooth equipment - Google Patents
Data frame transmission method, device, chip, storage medium and Bluetooth equipment Download PDFInfo
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- CN115277323A CN115277323A CN202210876978.9A CN202210876978A CN115277323A CN 115277323 A CN115277323 A CN 115277323A CN 202210876978 A CN202210876978 A CN 202210876978A CN 115277323 A CN115277323 A CN 115277323A
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Abstract
The embodiment of the application discloses a data frame transmission method, a data frame transmission device, a chip, a storage medium and Bluetooth equipment. The method comprises the following steps: modulating a first sequence of a data frame based on a first modulation mode; the data frame comprises a first sequence and a second sequence, the first sequence corresponds to a data part of the data frame, the second sequence corresponds to a preamble part of the data frame, and the first modulation mode corresponds to the bandwidth of the wireless communication channel; the modulated first sequence and the modulated second sequence are transmitted over a wireless communication channel.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a data frame transmission method, apparatus, chip, storage medium, and bluetooth device.
Background
With the rapid development of mobile communication technology, bluetooth (Bluetooth) is becoming a common data transmission mode between electronic devices (for example, portable devices such as mobile phones, tablet computers, notebook computers, palm computers, wireless earphones, smart speakers, smart watches, and the like), and short-distance wireless data transmission is realized between electronic devices, which is convenient, rapid, flexible and safe.
However, the data transmission rate is limited to the low data transmission rate in the bluetooth transmission in the prior art, and the continuous data transmission requirement cannot be met.
Disclosure of Invention
The embodiment of the application provides a data frame transmission method, a data frame transmission device, a chip, a storage medium and Bluetooth equipment, and improves data transmission rate.
The technical scheme of the embodiment of the application is realized as follows:
in a first aspect, an embodiment of the present application provides a data frame transmission method, where the method includes: modulating a first sequence of a data frame based on a first modulation mode; wherein the data frame comprises a first sequence and a second sequence, the first sequence corresponding to a data portion of the data frame, the second sequence corresponding to a preamble portion of the data frame, and the first modulation scheme corresponding to a bandwidth of a wireless communication channel; transmitting the modulated first sequence and the modulated second sequence over the wireless communication channel.
In a second aspect, an embodiment of the present application provides another data frame transmission method, where the method includes: receiving a first modulation sequence and a second modulation sequence over a wireless communication channel; demodulating the first modulation sequence based on a first modulation mode; wherein the first modulation scheme corresponds to a bandwidth of a wireless communication channel; the first modulation sequence corresponds to a data portion of a data frame and the second modulation sequence corresponds to a preamble portion of the data frame.
In a third aspect, an embodiment of the present application provides an apparatus for transmitting a data frame, where the apparatus includes: the modulation module is used for modulating a first sequence of the data frame based on a first modulation mode; wherein the data frame includes a first sequence and a second sequence, the first sequence corresponding to a data portion of the data frame, the second sequence corresponding to a preamble portion of the data frame, the first modulation corresponding to a bandwidth of a wireless communication channel; a transmission module to transmit the modulated first sequence and the modulated second sequence over the wireless communication channel.
In a fourth aspect, an embodiment of the present application provides another data frame transmission apparatus, where the apparatus includes: a receiving module, configured to receive a first modulation sequence and a second modulation sequence through a wireless communication channel; a demodulation module, configured to demodulate the first modulation sequence based on a first modulation manner; wherein the first modulation mode corresponds to a bandwidth of a wireless communication channel; the first modulation sequence corresponds to a data portion of a data frame and the second modulation sequence corresponds to a preamble portion of the data frame.
In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and when being executed by a first processor, the computer program implements the data frame transmission method according to the first aspect; or, when being executed by the second processor, the method for transmitting data frames according to the second aspect is implemented.
In a sixth aspect, an embodiment of the present application provides a chip, where the chip includes a first processor configured to: modulating a first sequence of the data frame based on a first modulation mode; wherein the data frame includes a first sequence and a second sequence, the first sequence corresponding to a data portion of the data frame, the second sequence corresponding to a preamble portion of the data frame, the first modulation corresponding to a bandwidth of a wireless communication channel; transmitting the modulated first sequence and the modulated second sequence over the wireless communication channel.
In a seventh aspect, an embodiment of the present application provides a chip, where the chip includes a second processor, and the second processor is configured to: receiving a first modulation sequence and a second modulation sequence over a wireless communication channel; demodulating the first modulation sequence based on a first modulation mode; wherein the first modulation scheme corresponds to a bandwidth of a wireless communication channel; the first modulation sequence corresponds to a data portion of a data frame and the second modulation sequence corresponds to a preamble portion of the data frame.
In an eighth aspect, an embodiment of the present application provides a bluetooth device, where the bluetooth device includes a memory and a processor, the memory stores a computer program that is executable on the processor, and the processor, when executing the computer program, implements the data frame transmission method according to the first aspect and the second aspect.
The embodiment of the application provides a data frame transmission method, a data frame transmission device, a chip, a storage medium and Bluetooth equipment. According to the scheme provided by the embodiment of the application, a first sequence of a data frame is modulated based on a first modulation mode; the data frame comprises a first sequence and a second sequence, the first sequence corresponds to a data part of the data frame, the second sequence corresponds to a preamble part of the data frame, and the first modulation mode corresponds to the bandwidth of the wireless communication channel; the modulated first sequence and the modulated second sequence are transmitted over a wireless communication channel. The two modulation modes are adopted to respectively modulate the leading part and the data part of the data frame, thereby improving the modulation performance.
Drawings
Fig. 1 is an exemplary schematic diagram of a BR frame format provided in an embodiment of the present application;
fig. 2 is an exemplary schematic diagram of an EDR frame format according to an embodiment of the present application;
figure 3 is an exemplary diagram of a BLE 1M frame format provided in an embodiment of the present application;
figure 4 is an exemplary diagram of a BLE2M frame format provided in an embodiment of the present application;
figure 5 is an exemplary diagram of a BLE LR 125K frame format provided in an embodiment of the present application;
figure 6 is an exemplary diagram of a BLE LR 500K frame format provided in an embodiment of the present application;
fig. 7 is a flowchart illustrating optional steps of a data frame transmission method according to an embodiment of the present application;
fig. 8 is an exemplary diagram of a BT frame format according to an embodiment of the present application;
fig. 9 is a flowchart illustrating optional steps of another data frame transmission method according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of an alternative data frame transmission apparatus according to an embodiment of the present application;
fig. 11 is an alternative structural diagram of another data frame transmission apparatus according to an embodiment of the present application;
fig. 12 is a schematic structural diagram of a bluetooth device according to an embodiment of the present application;
fig. 13 is a schematic structural diagram of another bluetooth device according to an embodiment of the present application.
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. It should be understood that some embodiments described herein are only for explaining the technical solutions of the present application, and are not intended to limit the technical scope of the present application.
In order to better understand the data frame transmission method provided in the embodiment of the present application, prior to introducing the technical solution of the embodiment of the present application, a description is given to a related technology.
The bluetooth technical scheme has evolved continuously from the initial realization of short-distance communication to the current communication requirement for the interconnection of everything. The scene that this application embodiment was used is bluetooth data transmission before the electronic equipment, and in an application scene, establish the bluetooth between intelligent motion bracelet and the smart mobile phone and be connected, can be fast with the information that collects in the motion processes such as running, swimming, bike, transmit terminal equipment such as smart mobile phone through the bluetooth channel on, the user can be better real time monitoring motion's situation. In another kind of application scenario, connect the bluetooth and connect between intelligent motion bracelet, smart mobile phone and the intelligent wrist-watch three, and the intelligent wrist-watch is as central pivot, can receive the motion information of collecting from the intelligent motion bracelet through the bluetooth channel, can also be as a display device, receives mail, SMS etc. that come from the smart mobile phone through the bluetooth channel.
The frame structure (which may also be referred to as a frame format) used in the related art mainly includes a Basic Rate (BR) frame format, an Enhanced Data Rate (EDR) frame format, a Bluetooth Low Energy (BLE) frame format, and the like. Which are described separately below.
Exemplarily, as shown in fig. 1, fig. 1 is an exemplary schematic diagram of a BR frame format provided in an embodiment of the present application, where the BR frame format includes the following fields: a Preamble (Preamble), a frame synchronization word (Sync word), a trailer (trailer), a header (header), and a payload (payload), where the header may include indication information indicating a length of bluetooth data (e.g., audio data), and the payload is used to carry the bluetooth data. The lengths of the fields Preamble, sync word, trailer, header and payload are 4 microseconds (us), 64us, 4us, 54us and Mus, where M is a positive integer and can be set by a person skilled in the art according to actual conditions. The BR frame format is that the modulation mode of the whole data packet is Gaussian Frequency Shift Keying (GFSK) modulation, and the data packet structure includes three fields of a GFSK Access code (GFSK Access code), a header and a payload. The Access code includes preamble, sync word and trailer three-part fields. The GFSK Access code is used for identifying a GFSK modulation mode. GFSK modulation carries one bit (bit) of information in a time unit. The BR modulation scheme is the original bluetooth scheme, and has a low transmission rate of only 1megabits per second (Mbps). Mbps is a unit of transmission rate and represents the number of bits transmitted per second, and 1Mbps represents 1000000 bits (bits) transmitted per second.
Exemplarily, as shown in fig. 2, fig. 2 is an exemplary schematic diagram of an EDR frame format provided in an embodiment of the present application, where the EDR frame format includes the following fields: preamble (Preamble), GFSK frame synchronization word (GFSK Sync word), trailer (trailer) corresponding to GFSK modulation, header (header), guard interval section (Guard interval), frame synchronization word (Sync word), payload (payload), trailer (trailer) corresponding to DPSK modulation. The corresponding lengths of the fields Preamble, GFSK Sync word, trailer, header, guard interval, sync word, payload and trailer are 4us, 64us, 4us, 54us, 5us, 11us, mus and 2us, wherein M is a positive integer, and can be set by a person skilled in the art according to actual conditions. The Preamble, the GFSK Sync word, and the trailer field are modulated by a GFSK modulation scheme, belong to a GFSK Access code (GFSK Access code), and are used to identify the GFSK modulation scheme, and the Preamble, the payload, and the trailer are modulated by a Differential Phase Shift Keying (DPSK) modulation scheme. The EDR modulation mode improves the disadvantages of the BR modulation scheme, and the data transmission rate is increased to 2Mbps or 3Mbps, but the power consumption thereof is large.
Illustratively, the BLE frame formats include a BLE 1M frame format, a BLE2M frame format, a BLE LR 125k frame format, and a BLE LR 500k frame format, as shown in fig. 3 and fig. 4, fig. 3 is an exemplary schematic diagram of a BLE 1M frame format provided in an embodiment of the present application, fig. 4 is an exemplary schematic diagram of a BLE2M frame format provided in an embodiment of the present application, and each of the BLE 1M frame format and the BLE2M frame format includes the following fields: preamble (Preamble), BLE Access code (BLE Access code), header (header), payload (payload). In the BLE 1M frame format, the fields Preamble, BLE Access code, header, payload correspond to 8us, 32us, 16us, mus. The modulation mode of BLE 1M frame format is the same as BR frame format, the modulation mode of the data packet is GFSK modulation, and in order to reduce power consumption, the lengths of the Aceess code and header fields are both shortened, and the frame format is shown in fig. 3. To increase the transmission rate, the BLE2M frame format is extended, the BLE2M frame format and the modulation method are similar to those of the BLE 1M frame format, but the channel bandwidth is 2 megahertz (MHz), and the frame format is shown in fig. 4. The BLE 1M modulation scheme optimizes the defect of high power consumption and reduces the power consumption, but the transmission rate is only 1Mbps, and the continuous and stable transmission requirement of audio data cannot be met. In the BLE2M frame format, the lengths of fields Preamble, BLE Access code, header, and payload are 8us, 16us, 8us, and M/2us, where M is a positive integer and can be set by a person skilled in the art according to actual situations. The BLE2M modulation scheme improves the transmission rate by 1 time by increasing the signal bandwidth, so that the transmission of audio data is more stable. But the data transmission rate is still very low, only 2Mbps.
For example, to improve the bluetooth transmission distance, the BLE frame format is extended to a BLE LR 125K frame format and a BLE LR 500K frame format, as shown in fig. 5 and 6, fig. 5 is an exemplary schematic diagram of a BLE LR 125K frame format provided in an embodiment of the present application, fig. 6 is an exemplary schematic diagram of a BLE LR 500K frame format provided in an embodiment of the present application, the frame formats provided in fig. 5 and 6 are suitable for Long distance (Long Range LR) transmission, and both the BLE LR 125K frame format and the BLE LR 500K frame format include the following fields: preamble (Preamble), BLE Access code (BLE Access code), CI rate (CI rate), custom field 1 (TERM 1), packet Header (Packet Header), payload (payload), custom field 2 (TERM 2). In the BLE LR 125K frame format, the length of Preamble, BLE Access code, CI rate, TERM1, packet Header, payload, TERM2 corresponds to 80us, 256us, 16us, 24us, 128us, M × 8us, 24us. In the BLE LR 500K frame format, the lengths of Preamble, BLE Access code, CI rate, TERM1, packet Header, payload, and TERM2 are 80us, 256us, 16us, 24us, 32us, M × 2us, and 6us, where M is a positive integer, and can be set by a person skilled in the art according to actual situations. Wherein TERM1 adopts 125 kbit per second coding mode, TERM2 adopts 125kb/s or 500kb/s coding mode, and kb/s represents the number of bits transmitted per second. The data transmission rate of both the BLE LR 125K modulation scheme and the BLE LR 500K modulation scheme is very low, and the requirements of high-rate data transmission still cannot be met, for example, bluetooth application scenarios such as lossless audio data transmission, hardware-fast OTA (Over-the-Air) upgrade, and the like.
An embodiment of the present application provides a data frame transmission method, as shown in fig. 7, fig. 7 is a flowchart illustrating steps of the data frame transmission method provided in the embodiment of the present application, where the data frame transmission method includes the following steps:
s101, modulating a first sequence of a data frame based on a first modulation mode; the data frame includes a first sequence and a second sequence, the first sequence corresponding to a data portion of the data frame, the second sequence corresponding to a preamble portion of the data frame, and the first modulation scheme corresponding to a bandwidth of the wireless communication channel.
S102, transmitting the modulated first sequence and the modulated second sequence through a wireless communication channel.
In some embodiments, the wireless communication channel is a bluetooth channel and the data frames are bluetooth data frames.
In this embodiment, the data frame transmission method may be applied to electronic devices that establish bluetooth connection, and the embodiment of this application takes bluetooth data transmission between a first device and a second device as an example for description. The data frame transmission method shown in fig. 7 may be applied to a first device, where the first device and a second device are both electronic devices, for example, a smart phone, a notebook computer, a palm computer, a bluetooth headset, a smart speaker, a smart watch, smart glasses, a smart bracelet, a watch, a bluetooth keyboard, a bluetooth mouse, a handwriting pen, a portable media playing device, other wearable devices, and the like.
In the embodiment of the present application, the first modulation scheme is a data modulation scheme, and may include a scheme having 2NPhase Shift Keying (PSK) modulation of Phase states, N being an integer greater than or equal to 2, is a form of Phase modulation (Phase modulation) used to express a series of discrete states, an evolution of frequency modulation (frequency modulation), the Phase of which is adjusted to encode the bits of digital information into each word Phase change (Phase Shift). Each time unit, e.g., a time domain symbol (symbol), corresponding to the phase shift keying modulation scheme may encode N bits (bits), which improves the data transmission rate.
According to the scheme provided by the embodiment of the application, a first sequence of a data frame is modulated based on a first modulation mode; the data frame comprises a first sequence and a second sequence, the first sequence corresponds to a data part of the data frame, the second sequence corresponds to a preamble part of the data frame, and the first modulation mode corresponds to the bandwidth of the wireless communication channel; the modulated first sequence and the modulated second sequence are transmitted over a wireless communication channel. The two modulation modes are adopted to respectively modulate the leading part and the data part of the data frame, thereby improving the modulation performance.
In some embodiments, the first modulation scheme comprises phase shift keying modulation; the second sequence is modulated based on gaussian frequency shift keying.
In this embodiment, the data frame includes a first sequence and a second sequence, and the first sequence and the second sequence are modulated by different modulation schemes (a first modulation scheme and a second modulation scheme), respectively. For example, the second modulation scheme may be Gaussian Frequency Shift Keying (GFSK), and the like, and the embodiment of the present application is not limited thereto. The second sequence is used for identifying the frame format corresponding to the first modulation mode, so that the second equipment demodulates the modulated second sequence to obtain the second sequence when demodulating, thereby identifying the first modulation mode adopted when the first sequence is modulated, and then demodulating the modulated first sequence according to the first modulation mode to obtain the first sequence.
For example, the first modulation scheme may include 4-phase shift keying QPSK with 4 phase states, which may also be referred to as quadrature phase shift keying, where one time domain symbol carries 2 bits of data, that is, one time domain symbol may transmit 2 bits of data; in four phases, "00", "01", "10" and "11", respectively; and a QPSK modulation mode is adopted, so that the data transmission rate is ensured.
Illustratively, the first modulation scheme may include 8Phase Shift Keying (8 PSK) with 8Phase states, which may also be referred to as eight-Phase Shift Keying (octaphase Shift Keying), where one time domain symbol represents 3 bits and one time domain symbol is transmitted to transmit 3 bits of data; expressed in eight phases are "000", "001", "010", "011", "100", "101", "110" and "111", respectively. 8PSK corresponds to PSK of 8 states. QPSK is used for half of the states, i.e., 4, and 16PSK is used for 2 times. Because 8PSK has 8 states, each time domain symbol (symbol) of 8PSK can encode 3 bits (bits), and the same time domain symbol can carry more bits, thereby increasing the rate of transmitting audio data, and thus supporting the transmission of high-definition audio data.
Illustratively, the first modulation mode may include 16PSK with 16 phase states, where one time domain symbol represents 4 bits, and one time domain symbol is transmitted to transmit 4 bits of data; the sixteen phases are denoted "0000", "0001", "0010", "0011", "0100", "0101", "0110", "0111", "1000", "1001", "1010", "1011", "1100", "1101", "1110" and "1111", respectively.
Illustratively, the first modulation scheme may include 32PSK with 32 phase states, one time domain symbol representing 5 bits, and one time domain symbol being transmitted for transmitting 5 bits of data. The first modulation scheme may comprise 64 phase shift keying 64PSK with 64 phase states, one time domain symbol representing 6 bits, and one time domain symbol being transmitted for 6bit data transmission.
In the embodiment of the application, the second sequence is modulated according to the second modulation mode, and is used for identifying the channel coding mode of the first modulation mode, and the second modulation mode adopts a GFSK modulation mode consistent with a BLE modulation scheme, so that the second sequence is well compatible with the BLE modulation scheme, the identification speed of the signal coding mode is increased, and the data transmission efficiency is improved.
In some embodiments, the bluetooth data frame includes a second sequence, a gap sequence and a first sequence, the gap sequence being located between the second sequence and the first sequence, the gap sequence being used for phase smoothing between the first modulation scheme and the second modulation scheme. As shown in fig. 8, fig. 8 is an exemplary schematic diagram of a BT frame format provided in an embodiment of the present application, where the BT frame format is an improvement on an original frame format, and the BT frame format includes a preamble signal and a data signal. The preamble corresponds to the second sequence, the data signal corresponds to the first sequence, and the preamble includes the following fields: a Preamble (Preamble), an Access code (Access code), a Header (Header), and a data signal including a frame synchronization word (Sync word), a payload (payload), and a trailer (trailer). The BT frame format also includes a guard interval portion (guard), which may also be referred to as an interval sequence. The length of Preamble, access code, header, guard, sync word, payload, trailer is 8us, 32us, 5us, nus, M2 us, 6us. N and M are positive integers which can be set by a person skilled in the art according to actual conditions.
In this embodiment of the application, the header in fig. 8 may include indication information for indicating a length of bluetooth data (e.g., audio data), sync word is used for synchronizing the first device and the second device, and payload is used for carrying the bluetooth data. Taking the example that the bluetooth data is audio data, the audio data carried in the payload may include audio data obtained by encoding the original audio data, and may also include audio data that has been encrypted and integrity-checked.
In the embodiment of the present application, since the phase modulation schemes corresponding to different modulation schemes are different, for example, GFSK is a continuous phase frequency modulation, and 8PSK is a form of phase modulation, and is used to express a series of discrete states, the bluetooth data frame further includes a gap sequence (guard), which may also be referred to as a guard gap. Illustratively, the guard may have a length of 5us, starting from the end of the last bit of the Header (Header) of the GFSK to the interval starting from the first bit of the frame sync word (sync word) of 8PSK, and is used for phase smoothing between the GFSK and 8PSK.
In the embodiment of the application, a guard of 5us is arranged between the preamble signal and the 8PSK sync word and used for phase smoothing between different modulation modes, so that the accuracy of data modulation is improved.
The embodiment of the application divides the frame format into two parts: the Preamble signal (namely, preamble, access code and Header) adopts a GFSK modulation mode, is the same as a BLE modulation scheme and can be well compatible with the BLE modulation scheme, the flexibility and the applicability of the modulation mode are improved, the modulation of the Preamble signal corresponding to the GFSK modulation mode can use original hardware equipment without updating the equipment, and therefore hardware resources are saved. Meanwhile, the data signal adopts an 8PSK modulation mode, so that the data transmission rate is improved.
In some embodiments, the first sequence includes a sync word, and the length of time of the sync word is determined based on a bandwidth of the wireless communication channel.
In the embodiment of the present application, the BT frame format in the embodiment of the present application extends the channel bandwidth supported by the BT signal from the original 1 megahertz (MHz) to 2MHz and 4MHz. The first sequence (corresponding to the data signal in fig. 8) further includes a frame sync word, where the frame sync word in fig. 8 is used for synchronizing the first device and the second device, and the time length of the sync word may be determined based on the bandwidth of the wireless communication channel, i.e., different lengths are set according to different channel bandwidth modes, and for example, the length of the frame sync word may be set to 30us for a 1MHz channel bandwidth (i.e., N in fig. 8 takes a value of 30); for a 2MHz channel bandwidth, the length of the frame sync word is set to 60us (i.e., N in fig. 8 is 60); the length of the frame sync word is set to 60us or 120us for a 4MHz channel bandwidth (i.e., N of fig. 8 takes the value of 60us or 120 us).
In some embodiments, before S101 in fig. 7, the data frame transmission method further includes S100.
S100, determining a coding mode of the first sequence based on the bandwidth of the wireless communication channel.
In some embodiments, the bandwidth of the wireless communication channel is a bluetooth channel bandwidth when the first device and the second device are in bluetooth communication.
In the embodiment of the present application, the BR modulation mode and the EDR modulation mode in the related art are based on a channel bandwidth (Band Width) of 1MHz, and the bandwidth mode of the BT scheme provided in the embodiment of the present application is maximally extended to 4MHz from the original 1MHz or 2MHz, that is, the supported channel bandwidths include 1MHz, 2MHz, and 4MHz. Different channel bandwidths support different modulation modes, and the first sequence can be further encoded before being modulated. And determining the coding mode of the first sequence according to the bandwidth of the wireless communication channel, thereby improving the application scene of the data frame transmission method.
In some embodiments, the above S100 may include the following three examples. Example one, when the bandwidth of the wireless communication channel is 1mhz, determining that the coding mode of the first sequence is trellis coded modulation; namely, the first modulation mode is determined as TCM and 8PSK hybrid modulation mode. Example two, in the case that the bandwidth of the wireless communication channel is 2mhz, determining that the coding mode of the first sequence is trellis coded modulation or reed solomon coding; namely, the first modulation mode is determined as TCM and 8PSK mixed modulation or RS code and 8PSK mixed modulation mode. Example three, when the bandwidth of the wireless communication channel is 4mhz, determining not to encode the first sequence, or determining that the encoding mode of the first sequence is trellis code modulation or reed solomon coding; namely, the first modulation mode is determined as TCM and 8PSK mixed modulation, RS code and 8PSK mixed modulation mode, or 8PSK.
In this embodiment of the present application, for different channel bandwidths, different first modulation manners may be adopted, and for the same channel bandwidth (for example, a 2MHz channel bandwidth and a 4MHz channel bandwidth), different first modulation manners may be adopted, as shown in table 1, where table 1 is a bluetooth frame format parameter provided in this embodiment of the present application. Table 1 shows 6 bluetooth frame formats.
TABLE 1
In the embodiment of the present application, the payload in fig. 8 may set different modulation schemes according to different channel bandwidth modes, which are described below. With the combination of table 1, for a 1MHz channel bandwidth, 2/3 code rate TCM and 8PSK mixed modulation are utilized to enable the data transmission rate to reach 2Mbps and the receiving sensitivity to reach-97 dBm. For 2MHz channel bandwidth, two modulation modes are included, namely 2/3 code rate TCM and 8PSK hybrid modulation and 5/6 code rate RS and 8PSK hybrid modulation, so that the transmission rate respectively reaches 4Mbps and 5Mbps, and the receiving sensitivity respectively reaches-95 dBm and-92 dBm. For a 4MHz channel bandwidth, three modulation modes are included: 2/3 code rate TCM and 8PSK mixed modulation, 5/6 code rate RS and 8PSK mixed modulation and 8PSK modulation, the data transmission rate can respectively reach 8Mbps,10Mbps and 12Mbps, and the receiving sensitivity can respectively reach-93 dBm, -89dBm and-84 dBm.
In the embodiment of the application, compared with the EDR modulation mode, the highest data transmission rate is increased by 4 times. Different sync word lengths are set according to different channel bandwidths, different modulation modes of payload are set according to different channel bandwidth modes, different rates are provided by various Bluetooth frame formats, different Bluetooth channel conditions in practical application can be met, and a diverse modulation scheme is provided for self-adaptive data rate transmission.
In the embodiment of the present application, the receiving sensitivity in table 1 is represented by a Bit Error Rate (BER), the embodiment of the present application provides 6 format numbers, and the corresponding receiving sensitivity is-97 dBm, -95dBm, -92dBm, -93dBm, -89dBm, -84dbm, dBm is a pure count unit and represents an absolute value of a reference power, and the 6 format numbers cover most scenes in display application, and support both bluetooth high-speed transmission under a short-distance high signal-to-noise ratio condition (for example, the highest 12Mbps transmission Rate) and a longer coverage range (for example, the highest-97 dBm sensitivity).
In the embodiment of the present application, a device may flexibly adjust a current transmission format according to an actual channel condition, for example, for a bluetooth transmission process, when a receiving sensitivity is higher, an effective working distance covered by the device (an effective working distance between a bluetooth transmitting device and a receiving device) is longer, and a corresponding bluetooth transmission rate is lower, for example, for an EDR modulation mode, when the receiving sensitivity is-97 dBm, a corresponding transmission rate may only be 1Mbps, whereas according to the BT scheme provided in the embodiment of the present application, when the receiving sensitivity is-97 dBm, a corresponding transmission rate reaches 2Mbps, and while stable bluetooth transmission is ensured, a higher data rate is provided as much as possible.
In the embodiment of the present application, as can be seen from table 1 above, the data transmission rate of the BT scheme provided in the embodiment of the present application is greatly improved compared with that of the bluetooth technology in the related art. Illustratively, the highest data transmission rate (12 Mbps data transmission rate corresponding to format code 6) is 4 times the fastest rate format in the related art (e.g., 3Mbps transmission rate corresponding to EDR 3M modulation mode). The lowest data transmission rate (2 Mbps data transmission rate corresponding to format coding 1) is 2 times of the bluetooth basic rate (1 Mbps transmission rate corresponding to BR modulation mode) in the related art. The embodiment of the application can meet the requirement of high-throughput data transmission.
In some embodiments, S100 described above may also be implemented in the following manner. Determining a modulation mode set according to the channel bandwidth; the modulation mode set comprises a plurality of candidate modulation modes related to the data transmission rate; determining a first modulation mode in a modulation mode set according to the channel state information; the channel state information reflects the Bluetooth channel quality of the first device and the second device during Bluetooth communication, and the Bluetooth channel quality is positively correlated with the data transmission rate.
In the embodiment of the application, the channel state information reflects the quality of the bluetooth channel, and the better the quality of the bluetooth channel is, the higher the data transmission rate can be applied to. For the channel condition with a short distance and a low sensitivity requirement, a modulation mode corresponding to a high data transmission rate may be selected, for example, a 4MHz channel bandwidth may be selected, and an 8PSK modulation mode is adopted, where the data transmission rate is 12Mbps. For the channel condition with longer distance, the modulation mode corresponding to higher sensitivity and lower data transmission rate is properly selected, for example, 1MHz channel bandwidth can be selected, and the TCM and 8PSK mixed modulation with 2/3 code rate is used to modulate the bluetooth data frame, so that the data transmission rate reaches 2Mbps, and compared with the 1Mbps transmission rate corresponding to the BR modulation mode, the data transmission rate is still improved.
In the embodiment of the present application, different channel bandwidths correspond to multiple modulation modes, and the multiple modulation modes correspond to different data transmission rates, so that the embodiment of the present application determines multiple candidate modulation modes that can be selected according to the channel bandwidths, and then determines a first modulation mode among the multiple candidate modulation modes according to the channel state information, so that the selected first modulation mode meets the condition of the current bluetooth channel, thereby improving the data transmission rate and reasonably utilizing resources. Meanwhile, adaptive adjustment between different modulation formats (for example, 2/3 rate TCM and 8PSK hybrid modulation) can be realized, and adaptive rate (auto rate) transmission is realized.
In some embodiments, the channel state information may be determined in the following manner. Receiving Reference Signal (RS) power transmitted by the second device; determining a received signal-to-noise ratio according to the reference signal power; and determining the channel state information according to the received signal-to-noise ratio. The reference signal power represents the signal power actually transmitted by the second device, and the received signal-to-noise ratio is calculated according to the reference signal power and the actual received power of the first device. The received signal-to-noise ratio is positively correlated with the throughput of the Bluetooth channel, and the quality of the Bluetooth channel is reflected. Therefore, according to the channel state information, a proper data transmission rate (namely, a proper first modulation mode) is selected for data frame transmission, and the data transmission rate is improved.
In some embodiments, the first modulation scheme in S101 in fig. 7 may be further determined by: receiving a data transmission request sent by second equipment; and determining a first modulation mode according to the data transmission request.
In this embodiment of the present application, the first modulation scheme may be determined by the second device, and then sent to the first device, and the first device modulates the bluetooth data frame according to the first modulation scheme. The second device determines the first modulation mode according to the demodulation requirement of the second device, for example, the demodulation mode which can be identified and executed by the second device, and sends the first modulation mode to the second device in a data transmission request mode. It is to be understood that the second device may also determine the first modulation scheme by using a method of determining the first modulation scheme with the first device, for example, determining the first modulation scheme according to the channel bandwidth and/or the channel state information.
In the embodiment of the application, the first device determines the first modulation mode through the data transmission request sent by the second device, so that the diversity of data transmission is improved.
The embodiment of the application also provides a data frame transmission method, which is executed by the second device. I.e. the data frame transmission process is explained from the demodulation process of the second device. As shown in fig. 9, fig. 9 is a flowchart of steps of another data frame transmission method according to an embodiment of the present application, where the data frame transmission method includes the following steps:
s201, receiving a first modulation sequence and a second modulation sequence through a wireless communication channel, where the first modulation sequence corresponds to a data portion of a data frame, and the second modulation sequence corresponds to a preamble portion of the data frame.
S202, demodulating the first modulation sequence based on the first modulation mode; the first modulation scheme corresponds to a bandwidth of the wireless communication channel.
In this embodiment of the application, fig. 9 and fig. 7 respectively illustrate a data frame transmission method from a demodulation process of the second device and a modulation process of the first device, and for specific descriptions of embodiments of the data frame transmission method implemented in S201 and S202 in fig. 9 and achieved technical effects, reference may be made to fig. 7, which is not repeated herein.
In some embodiments, the second modulation sequence is demodulated based on gaussian frequency shift keying.
In some embodiments, before S201 in fig. 9, the data frame transmission method further includes the following steps. And sending a data transmission request to the first equipment, wherein the data transmission request is used for determining the first modulation mode.
In order to implement the data frame transmission method according to the embodiment of the present application, an embodiment of the present application further provides a data frame transmission device, as shown in fig. 10, where fig. 10 is an optional schematic structural diagram of the data frame transmission device according to the embodiment of the present application, and the data frame transmission device 100 includes: a modulation module 1001, configured to modulate a first sequence of a data frame based on a first modulation mode; the data frame comprises a first sequence and a second sequence, the first sequence corresponds to a data part of the data frame, the second sequence corresponds to a preamble part of the data frame, and the first modulation mode corresponds to the bandwidth of the wireless communication channel; a transmitting module 1002 for transmitting the modulated first sequence and the modulated second sequence over a wireless communication channel.
In some embodiments, the first modulation scheme comprises phase shift keying modulation;
the modulation module 1001 is further configured to modulate the second sequence based on gaussian frequency shift keying.
In some embodiments, the first sequence comprises a sync word; the data frame transmission apparatus 100 further includes a determination module 1003;
a determining module 1003 for determining the time length of the synchronization word based on the bandwidth of the wireless communication channel.
In some embodiments, the determining module 1003 is further configured to determine a coding scheme of the first sequence based on a bandwidth of the wireless communication channel.
In some embodiments, the determining module 1003 is further configured to determine that the coding mode of the first sequence is Trellis Coded Modulation (TCM) when the bandwidth of the wireless communication channel is 1 MHz; under the condition that the bandwidth of a wireless communication channel is 2MHz, determining that the coding mode of the first sequence is TCM or Reed Solomon coding RS code; and under the condition that the bandwidth of the wireless communication channel is 4MHz, determining not to encode the first sequence, or determining the encoding mode of the first sequence to be TCM or RS code.
In some embodiments, the wireless communication channel is a bluetooth channel.
In order to implement the data frame transmission method according to the embodiment of the present application, an embodiment of the present application further provides a data frame transmission device, as shown in fig. 11, where fig. 11 is an optional structural schematic diagram of another data frame transmission device according to the embodiment of the present application, and the data frame transmission device 110 includes: a receiving module 1101, configured to receive a first modulation sequence and a second modulation sequence through a wireless communication channel, where the first modulation sequence corresponds to a data portion of a data frame, and the second modulation sequence corresponds to a preamble portion of the data frame; a demodulation module 1102, configured to demodulate the first modulation sequence based on a first modulation scheme, where the first modulation scheme corresponds to a bandwidth of a wireless communication channel.
In some embodiments, the first modulation scheme comprises phase shift keying modulation;
the demodulation module 1102 is further configured to demodulate the second modulation sequence based on gaussian frequency shift keying.
It should be noted that, when the data frame transmission device provided in the foregoing embodiment performs data frame transmission, only the division of the program modules is taken as an example, and in practical applications, the above processing may be distributed to different program modules according to needs, that is, the internal structure of the device is divided into different program modules to complete all or part of the above-described processing. In addition, the data frame transmission apparatus and the data frame transmission method provided by the above embodiments belong to the same concept, and specific implementation processes and beneficial effects thereof are detailed in the method embodiments and are not described herein again. For technical details not disclosed in the embodiments of the apparatus, reference is made to the description of the embodiments of the method of the present application for understanding.
Embodiments of the present application further provide a chip, where the chip includes a first processor, where the first processor is configured to: modulating a first sequence of a data frame based on a first modulation mode; the data frame comprises a first sequence and a second sequence, the first sequence corresponds to a data part of the data frame, the second sequence corresponds to a preamble part of the data frame, and the first modulation mode corresponds to the bandwidth of the wireless communication channel; the modulated first sequence and the modulated second sequence are transmitted over a wireless communication channel.
Embodiments of the present application further provide another chip, where the chip includes a second processor, and the second processor is configured to: receiving a first modulation sequence and a second modulation sequence over a wireless communication channel; demodulating the first modulation sequence based on the first modulation mode; wherein the first modulation mode corresponds to a bandwidth of the wireless communication channel; the first modulation sequence corresponds to a data portion of the data frame and the second modulation sequence corresponds to a preamble portion of the data frame.
In this embodiment of the present application, fig. 12 is a schematic diagram of a component structure of a bluetooth device according to the embodiment of the present application, and as shown in fig. 12, a device 120 according to the embodiment of the present application includes a first processor 1201 and a first memory 1202 storing an executable computer program, where the first processor 1201 is configured to implement a data frame transmission method executed by a first device side in the embodiment of the present application when executing the executable computer program stored in the first memory 1202. In some embodiments, the bluetooth device 120 may further include a first communication interface 1203, and a first bus 1204 for connecting the first processor 1201, the first memory 1202, and the first communication interface 1203.
In this embodiment, the first bus 1204 is used to connect the first communication interface 1203, the first processor 1201 and the first memory 1202, so as to realize mutual communication among these devices.
In this embodiment of the present application, fig. 13 is a schematic diagram of another bluetooth device composition structure proposed in this embodiment of the present application, and as shown in fig. 13, the device 130 proposed in this embodiment of the present application includes a second processor 1301, a second memory 1302 storing an executable computer program, and the second processor 1301 is configured to implement the data frame transmission method executed by the second device side in this embodiment of the present application when executing the executable computer program stored in the second memory 1302. In some embodiments, the bluetooth device 130 may further include a second communication interface 1303 and a second bus 1304 for connecting the second processor 1301, the second memory 1302 and the second communication interface 1303.
In this embodiment of the application, the second bus 1304 is used to connect the second communication interface 1303, the second processor 1301 and the second memory 1302, so as to implement mutual communication between these devices.
In this embodiment, the first Processor 1201 and the second Processor 1301 may be at least one of an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a ProgRAMmable Logic Device (PLD), a Field ProgRAMmable Gate Array (FPGA), a Central Processing Unit (CPU), a controller, a microcontroller, and a microprocessor. It is understood that the electronic devices for implementing the above processor functions may be other devices, and the embodiments of the present application are not limited in particular.
In addition, each functional module in this embodiment may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware or a form of a software functional module.
Based on the understanding that the technical solutions of the present embodiment substantially or partially contribute to the prior art, or all or part of the technical solutions may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the method of the present embodiment. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
An embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and is configured to implement, when executed by a first processor, the data frame transmission method according to any embodiment executed by a first device; for implementing the data frame transmission method according to any of the embodiments performed on the second device side as described above when executed by the second processor.
For example, the program instructions corresponding to a data frame transmission method in this embodiment may be stored on a storage medium such as an optical disc, a hard disk, a usb disk, or the like, and when the program instructions corresponding to a data frame transmission method in the storage medium are read or executed by an electronic device, the data frame transmission method according to any of the above embodiments may be implemented.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of implementations of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart block or blocks and/or flowchart block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks in the flowchart and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application.
Claims (14)
1. A method for transmitting data frames, the method comprising:
modulating a first sequence of a data frame based on a first modulation mode; wherein the data frame comprises a first sequence and a second sequence, the first sequence corresponding to a data portion of the data frame, the second sequence corresponding to a preamble portion of the data frame, and the first modulation scheme corresponding to a bandwidth of a wireless communication channel;
transmitting the modulated first sequence and the modulated second sequence over the wireless communication channel.
2. The method of claim 1, wherein the first modulation scheme comprises phase shift keying modulation; the method further comprises the following steps:
modulating the second sequence based on Gaussian frequency shift keying.
3. The method of claim 1, wherein the first sequence comprises a sync word, the method further comprising:
determining a time length of the synchronization word based on a bandwidth of the wireless communication channel.
4. The method according to any one of claims 1-3, further comprising:
determining a coding scheme for the first sequence based on a bandwidth of the wireless communication channel.
5. The method of claim 4, wherein determining the coding of the first sequence based on the bandwidth of the wireless communication channel comprises:
determining that the coding mode of the first sequence is trellis coded modulation under the condition that the bandwidth of the wireless communication channel is 1 MHz;
determining that the coding mode of the first sequence is the trellis coded modulation or Reed Solomon coding under the condition that the bandwidth of the wireless communication channel is 2 MHz;
and when the bandwidth of the wireless communication channel is 4MHz, determining not to encode the first sequence, or determining that the encoding mode of the first sequence is the trellis coded modulation or the Reed Solomon encoding.
6. A method according to any of claims 1-3, wherein the wireless communication channel is a bluetooth channel.
7. A method for transmitting a data frame, the method comprising:
receiving a first modulation sequence and a second modulation sequence over a wireless communication channel;
demodulating the first modulation sequence based on a first modulation mode;
wherein the first modulation scheme corresponds to a bandwidth of a wireless communication channel; the first modulation sequence corresponds to a data portion of a data frame and the second modulation sequence corresponds to a preamble portion of the data frame.
8. The method of claim 7, wherein the first modulation scheme comprises phase shift keying modulation; the method further comprises the following steps:
demodulating the second modulation sequence based on Gaussian frequency shift keying.
9. An apparatus for transmitting data frames, the apparatus comprising:
the modulation module is used for modulating a first sequence of the data frame based on a first modulation mode; wherein the data frame includes a first sequence and a second sequence, the first sequence corresponding to a data portion of the data frame, the second sequence corresponding to a preamble portion of the data frame, the first modulation corresponding to a bandwidth of a wireless communication channel;
a transmission module to transmit the modulated first sequence and the modulated second sequence over the wireless communication channel.
10. An apparatus for transmitting data frames, the apparatus being applied to a second device, the apparatus comprising:
a receiving module, configured to receive a first modulation sequence and a second modulation sequence through a wireless communication channel;
a demodulation module, configured to demodulate the first modulation sequence based on a first modulation manner; wherein the first modulation scheme corresponds to a bandwidth of a wireless communication channel; the first modulation sequence corresponds to a data portion of a data frame and the second modulation sequence corresponds to a preamble portion of the data frame.
11. A computer-readable storage medium, in which a computer program is stored which, when executed by a first processor, carries out the method of any one of claims 1 to 6;
or for implementing the method of claim 7 or 8 when executed by a second processor.
12. A chip, wherein the chip comprises a first processor configured to:
modulating a first sequence of a data frame based on a first modulation mode; wherein the data frame includes a first sequence and a second sequence, the first sequence corresponding to a data portion of the data frame, the second sequence corresponding to a preamble portion of the data frame, the first modulation corresponding to a bandwidth of a wireless communication channel;
transmitting the modulated first sequence and the modulated second sequence over the wireless communication channel.
13. A chip, wherein the chip comprises a second processor configured to:
receiving a first modulation sequence and a second modulation sequence over a wireless communication channel;
demodulating the first modulation sequence based on a first modulation mode;
wherein the first modulation mode corresponds to a bandwidth of a wireless communication channel; the first modulation sequence corresponds to a data portion of a data frame and the second modulation sequence corresponds to a preamble portion of the data frame.
14. A bluetooth device, characterized in that the bluetooth device comprises a memory and a processor;
the memory stores a computer program operable on the processor;
the processor, when executing the computer program, implements the method of any of claims 1-8.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024021690A1 (en) * | 2022-07-25 | 2024-02-01 | 哲库科技(上海)有限公司 | Data frame transmission method and apparatus, chip, computer readable storage medium, bluetooth device, program, and program product |
| WO2024021706A1 (en) * | 2022-07-25 | 2024-02-01 | 哲库科技(上海)有限公司 | Data frame transmission method and apparatus, and chip, computer-readable storage medium, bluetooth device, program and program product |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024021690A1 (en) * | 2022-07-25 | 2024-02-01 | 哲库科技(上海)有限公司 | Data frame transmission method and apparatus, chip, computer readable storage medium, bluetooth device, program, and program product |
| WO2024021706A1 (en) * | 2022-07-25 | 2024-02-01 | 哲库科技(上海)有限公司 | Data frame transmission method and apparatus, and chip, computer-readable storage medium, bluetooth device, program and program product |
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