CN112152649B - Radio frequency circuit, terminal device, signal transmission method, and storage medium - Google Patents

Abstract

Embodiments of the present application disclose a radio frequency circuit, a terminal device, a signal transmission method, and a storage medium. The radio frequency circuit includes a transmission module, a first transmission path, a second transmission path, and a control unit; the control unit is used for In a communication mode, the transmitting module is controlled to transmit the transmitting signal to the first transmitting channel; the first transmitting channel is used to process the transmitting signal transmitted by the transmitting module, and send the processed transmitting signal to the network device; the control unit also uses When in the second communication mode, the transmitting module is controlled to transmit the transmitting signal to the second transmitting channel, and the transmitting signal in the second communication mode does not interfere with the receiving signal; the second transmitting channel is used to transmit the transmitting module The transmit signal is sent to the network device. The above-mentioned radio frequency circuit, terminal device, signal transmission method and storage medium can reduce the insertion loss of the transmission signal on the transmission path, and reduce the power consumption during signal transmission.

Description

Radio frequency circuit, terminal equipment, signal transmission method and storage medium

technical field

The present application relates to the field of communication technologies, and in particular, to a radio frequency circuit, a terminal device, a signal transmission method, and a storage medium.

Background technique

With the rapid development of communication technology, 5G (5th generation mobile networks, fifth generation mobile communication technology) has gradually entered the life of Internet users, and more and more terminal devices support access to 5G networks. In order to support the transmission of 5G signals, the terminal equipment needs to improve the traditional radio frequency module, adding devices to the radio frequency module to support the transmission of 5G signals, which leads to an increase in the insertion loss on the transmission path. How to reduce the power consumption during signal transmission has become a problem. issues that need to be addressed urgently.

SUMMARY OF THE INVENTION

Embodiments of the present application disclose a radio frequency circuit, a terminal device, a signal transmission method, and a storage medium, which can reduce the insertion loss of a transmission signal on a transmission path and reduce power consumption during signal transmission.

The embodiment of the present application discloses a radio frequency circuit, which includes a transmission module, a first transmission channel, a second transmission channel, and a control unit. The transmission module is electrically connected to the first transmission channel and the second transmission channel, respectively. The control unit is electrically connected to the launch module, and the number of devices included in the second path is smaller than the number of devices included in the first path;

the control unit, configured to control the transmission module to transmit a transmission signal to the first transmission channel when in the first communication mode;

The first transmission path is used to process the transmission signal transmitted by the transmission module, and send the processed transmission signal to the network device, so as to suppress the transmission signal in the first communication mode from affecting the received signal. interference;

The control unit is further configured to control the transmitting module to transmit transmit signals to the second transmit path when in the second communication mode, and the transmit signals in the second communication mode do not interfere with the received signals;

The second transmission path is used for sending the transmission signal transmitted by the transmission module to the network device.

An embodiment of the present application discloses a terminal device including the above circuit.

The embodiment of the present application discloses a signal transmission method, which is applied to a terminal device, and the method includes:

When the terminal device is in the first communication mode, the transmission signal is processed through the first transmission path, and the processed transmission signal is sent to the network device, so as to suppress the transmission signal in the first communication mode from the reception signal interference;

When the terminal device is in the second communication mode, a transmission signal is sent to the network device through a second transmission channel, wherein the transmission signal in the second communication mode does not interfere with the received signal, and the second channel The number of included devices is smaller than the number of devices included in the first via.

An embodiment of the present application discloses a terminal device, which includes a memory and a processor, where a computer program is stored in the memory, and when the computer program is executed by the processor, the processor implements the above method.

The embodiment of the present application discloses a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, implements the above-mentioned method.

The radio frequency circuit, terminal device, signal transmission method, and storage medium disclosed in the embodiments of the present application, when in the first communication mode, process the transmission signal through the first transmission path, and send the processed transmission signal to the network device, thereby enabling Suppress the interference of the transmitted signal in the first communication mode to the received signal. When in the second communication mode, since the transmitted signal in the second communication mode does not interfere with the received signal, the transmission can be transmitted to the network device through the second transmission path. The signal can distinguish the communication mode. In different communication modes, different transmission channels are used to send the transmission signal. When it is not necessary to suppress the interference of the transmission signal to the received signal, the transmission signal can be sent through the second transmission channel with fewer devices, which can The insertion loss of the transmit signal on the transmit path is reduced, and the power consumption during signal transmission is reduced.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is an application scenario diagram of a signal transmission method in an embodiment;

2 is a structural block diagram of a radio frequency circuit in one embodiment;

3 is a structural block diagram of a radio frequency circuit in another embodiment;

4 is a structural block diagram of a first transmission path in one embodiment;

5 is a structural block diagram of a radio frequency circuit in another embodiment;

6 is a structural block diagram of a radio frequency circuit in another embodiment;

7 is a structural block diagram of a terminal device in one embodiment;

8 is a flowchart of a signal transmission method in one embodiment;

9 is a block diagram of a signal transmission apparatus in one embodiment;

FIG. 10 is a structural block diagram of a terminal device in another embodiment.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

It should be noted that the terms "comprising" and "having" in the embodiments of the present application and the accompanying drawings and any modifications thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally also includes For other steps or units inherent to these processes, methods, products or devices.

It will be understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first transmit path may be referred to as a second transmit path, and similarly, a second transmit path may be referred to as a first transmit path, without departing from the scope of this application. Both the first transmission path and the second transmission path are transmission paths for radio frequency signals, but they are not the same transmission path.

FIG. 1 is an application scenario diagram of a signal transmission method in an embodiment. As shown in FIG. 1, a communication connection is established between the terminal device 110 and the network device 120. Optionally, the terminal device 110 can establish a communication connection with the network device 120 through the fourth-generation, fifth-generation and other communication technologies. It is not limited in the embodiments of the present application.

In some embodiments, the terminal device 110 may be referred to as user equipment (user equipment, UE). The terminal device can be a personal communication service (PCS) phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (personal digital assistant) assistant, PDA) and other equipment, the terminal equipment can also be a mobile phone, a mobile station (mobile station, MS), a terminal equipment (mobile terminal), a notebook computer, etc., the terminal equipment 110 can be connected via a radio access network (radio access network, RAN) communicates with one or more core networks. For example, the terminal device 110 may be a mobile phone (or referred to as a "cellular" phone) or a computer with a terminal device, etc. For example, the terminal device 110 may also be a portable, pocket-sized, hand-held, computer-built-in or vehicle-mounted mobile device , they exchange voice and/or data with the radio access network. The terminal device 110 may also be a handheld device with a wireless communication function, a computing device, or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future evolving network, etc., which is not limited in the implementation of this application.

In some embodiments, the network device 120 may be an evolved base station in a long term evolution (LTE) system, an NR communication system, or an authorized auxiliary access long-term evolution (LAA-LTE) system (evolutional node B, may be referred to as eNB or e-NodeB for short) macro base station, micro base station (also called "small base station"), pico base station, access point (AP), transmission point (TP) Or a new generation base station (new generation Node B, gNodeB) and so on. The above-mentioned network device 120 may also be other types of network devices in the future evolution network, which is not limited in the implementation of this application.

In related technologies, 5G has two major deployment schemes: NSA (non-standalone, non-independent networking) and SA (standalone, independent networking). At this stage, most 5G deployment schemes adopt NSA. networks, the fourth generation of mobile communication technology) base stations are transformed to realize the transmission of 5G signals. In order to improve the data transmission rate and ensure the stability of signal transmission, the terminal equipment can adopt multi-connection technologies such as ENDC (E-UTRAN, new radio dual connectivity), CA (Carrier Aggregation, carrier aggregation). Among them, ENDC is a dual connection of 4G and 5G, the terminal equipment is connected to 4G base station and 5G base station at the same time, and supports the transmission of 4G signal and 5G signal at the same time; CA technology can aggregate multiple carriers together, thereby improving the uplink and downlink transmission rate. For multi-connection technologies such as ENDC and CA, different frequency band combinations can be used to support transmitting signals in multiple (at least two) different frequency bands.

For some specific frequency band combinations, the terminal equipment may have the problem of self-interference, and the transmitted signal may have problems such as harmonic interference to the received signal. For example, taking the combination of the B3 (transmitting frequency 1710-1785MHz (megahertz)) band and the N78 (frequency 3300-3800MHz) band as an example, the second harmonic of the transmitted signal in the B3 band will affect the received signal in the N78 band (B3 The second harmonic of the frequency band falls exactly within the frequency band of N78). In order to solve this problem, it is necessary to add filters, combiners and other devices to the transmission path after the power amplifier (Power Amplifier, PA) to meet the 5G radio frequency index requirements. However, the target terminal equipment can support dozens of frequency bands, and some frequency band combinations meet the requirements of radio frequency, and also need to pass through the transmission path including filters, combiners and other devices, resulting in an increase in the insertion loss of the transmission path and the power consumption of the PA. Increase.

Embodiments of the present application provide a radio frequency circuit, a terminal device, a signal transmission method, and a storage medium, which can distinguish communication modes. In different communication modes, different transmission paths are used to send transmission signals, and there is no need to suppress the effect of transmission signals on received signals. When interference occurs, the transmit signal can be sent through the second transmit channel with fewer devices, which can reduce the insertion loss of the transmit signal on the transmit channel and reduce the power consumption during signal transmission.

FIG. 2 is a structural block diagram of a radio frequency circuit in one embodiment. As shown in FIG. 2 , in one embodiment, the radio frequency circuit 200 may include a control unit 210 , a transmission module 220 , a first transmission path 230 and a second transmission path 240 . The control unit 210 is electrically connected to the transmitting module 220, and the transmitting module 220 is electrically connected to the first transmitting channel 230 and the second transmitting channel 240, respectively.

The control unit 210 is configured to control the transmission module 220 to transmit the transmission signal to the first transmission path 230 when in the first communication mode.

The first transmission path 230 is used to process the transmission signal transmitted by the transmission module 220 and send the processed transmission signal to the network device, so as to suppress the interference of the transmission signal in the first communication mode to the reception signal.

Alternatively, the control unit may be a baseband chip, a modem chip, or the like. The control unit 210 can acquire the current communication mode, which can be used to represent the current communication mode between the terminal device and the network device. In some embodiments, the communication modes may include, but are not limited to, ENDC mode, AC mode, single carrier mode, and the like. Among them, the ENDC mode is a 4G and 5G dual-connection mode, and the terminal device establishes a communication connection with the 4G network device and the 5G network device at the same time. The AC mode is the aggregation of multiple carriers under the same network access technology, and the terminal equipment establishes communication connections with network equipment in different cells under the same macro station. The single-carrier mode is to perform single-carrier signal transmission only on one frequency band, and a terminal device establishes a communication connection with a network device.

For multi-connection modes such as ENDC mode, AC mode, etc., one or more different frequency band combinations can be defined. At present, there are multiple frequency bands such as LB (Low Band, low frequency)/MB (Middle Band, medium frequency)/HB (High Band, high frequency) for LTE worldwide, and 5G also has multiple frequency bands such as LB/MB/HB/SUB6G. Therefore, for multi-connection modes such as ENDC mode and AC mode, there may be many different frequency band combinations. B3 (transmission frequency 1710-1785MHz)+N78 (frequency 3300-3800MHz), etc. For AC mode, it can include B1+B3, B2+B39 (frequency 1880-1920MHz), etc., which is not limited here.

For some frequency band combinations, there may be a problem of self-interference, that is, the transmitted signal of the first frequency band will interfere with the received signal of the second frequency band, and the interference may include but not limited to harmonic interference, that is, the transmission of the first frequency band The multiple of the frequency band (the multiple can be a positive integer greater than or equal to 2) will fall into the receiving frequency band of the second frequency band. In the embodiments of the present application, the first communication mode may refer to a communication mode in which a transmitted signal interferes with a received signal, and may include, but is not limited to, the ENDC mode and the AC mode with the above-mentioned frequency band combination with self-interference problem.

After acquiring the current communication mode, the control unit 210 can determine whether the current communication mode is the first communication mode or the second communication mode. In some embodiments, the respective first communication modes and the respective second communication modes may be written into the driver file. When the control unit 210 receives the network access instruction, it can determine the selected network connection mode (such as ENDC mode, AC mode, single carrier mode, etc.) according to the network access instruction, and the transmission frequency band in the network connection mode , receiving frequency band, etc., so that the communication mode that matches the selected network connection mode, transmitting frequency band, and receiving frequency band can be found in the driver file. If the matched communication mode belongs to the first communication mode, the current communication mode is determined to be the first communication mode, and if the matched communication mode belongs to the second communication mode, the current communication mode is determined to be the second communication mode.

As another implementation manner, after determining the network connection mode to be selected and used, the control unit 210 can determine whether the network connection mode is a multi-connection mode such as ENDC, AC, etc., and if so, can further obtain the transmission in the network connection mode. Frequency band and receiving frequency band, and determine whether there is harmonic interference according to the transmitting frequency band and receiving frequency band. If the multiple of the transmitting frequency band is within the receiving frequency band, it is determined that there is harmonic interference, and the current communication mode can be determined as the first communication mode. If there is no harmonic interference, or the network connection mode is not the multi-connection mode, it may be determined that the current communication mode is the second communication mode.

If the current communication mode is the first communication mode, the transmitting module 220 can be controlled to transmit signals to the first transmitting channel 230 . The first transmission path 230 may include processing the transmission signal transmitted by the transmission module 220. Optionally, the processing may include filtering out components in the transmission signal that may interfere with the received signal, and the obtained processed transmission signal will not Interference is generated to the received signal, so that the interference of the transmitted signal in the first communication mode to the received signal can be suppressed.

In some embodiments, the transmitting module 220 may include a radio frequency transceiver and a PA, and the control unit 210 performs encoding, modulation, etc. on the data signal to be sent to obtain a transmitting signal, and sends the transmitting signal to the PA through the radio frequency transceiver . The PA can amplify the transmitted signal to obtain enough power and current, so that the transmitted signal can be converted into electromagnetic waves and radiated out through the antenna. In the first communication mode, the transmission module 220 can send the amplified transmission signal to the first transmission path 230 . Optionally, the radio frequency circuit 200 may further include an antenna (not shown in FIG. 1 ), and the first transmission path 230 may be electrically connected to the antenna. After the first transmission path 230 performs interference suppression processing on the transmission signal, the processed The transmitted signal is sent to the antenna, which is then converted into electromagnetic waves and radiated by the antenna, and the network device can receive the transmitted signal.

The control unit 210 is further configured to control the transmit module 220 to transmit transmit signals to the second transmit path 240 when in the second communication mode, and the transmit signals in the second communication mode do not interfere with the receive signals.

The second transmission path 240 is used for sending the transmission signal transmitted by the transmission module 220 to the network device.

The second communication mode may refer to a communication mode in which the transmitted signal does not interfere with the received signal, and may include, but is not limited to, the ENDC mode, AC mode, and single-carrier mode of frequency band combinations without self-interference problems, for example, B1 of the ENDC mode The frequency band combination of (transmission frequency 1920-1980MHz) + N41 (frequency 2496MHz-2690MHz) will not cause harmonic interference, and the frequency band combination itself has met the radio frequency requirements, so it can be determined as the second communication mode. For another example, the transmitted signals of some frequency bands in the single-carrier mode also meet the radio frequency requirements, and can also be determined as the second communication mode and the like.

If the current communication mode is the second communication mode, the transmission module 220 can send the transmission signal to the second transmission channel. Since the transmission signal in the second communication mode does not interfere with the reception signal, it is not necessary to perform the transmission signal to the reception signal. The generated harmonic interference is suppressed, so the second transmit path 240 may include fewer components than the first transmit path 230 . In some embodiments, the second transmission path 240 can also be electrically connected to the antenna. The second transmission path 240 can directly transmit the transmission signal sent by the PA in the transmission module 220 to the antenna, and then the antenna is converted into electromagnetic waves and radiated out. The network device can then receive the transmitted signal.

Different transmission channels can be used for different communication modes. On the premise that the frequency band/frequency band combination itself meets the requirements of the radio frequency index, signals can be sent directly through fewer transmission channels of the device, instead of using the same transmission channel in all communication modes. The transmit channel can solve the problem of sacrificing the channel insertion loss of other frequency band combinations, single carrier mode, etc.

As a specific implementation manner, the second transmission path 240 may be a pure impedance circuit, the second transmission path 240 may not include any device, and the transmission signal sent by the transmission module 210 can be directly transmitted to the antenna after passing through the second transmission path 240, It can effectively reduce the insertion loss caused by the transmission signal in the second communication mode, and reduce the transmission current of the PA. Under the same PA transmission power, the second transmission path 240 can output higher power, which can make the radio frequency sent by the antenna. The coverage of the signal is wider.

In the embodiment of the present application, when the first communication mode is in the first communication mode, the transmission signal is processed through the first transmission path, and the processed transmission signal is sent to the network device, so that the transmission signal in the first communication mode can be suppressed from receiving the transmission signal. Signal interference, when in the second communication mode, since the transmitted signal in the second communication mode does not interfere with the received signal, the signal can be transmitted to the network device through the second transmission channel, and the communication mode can be distinguished. Different communication modes Different transmission channels are used to send the transmission signal. When it is not necessary to suppress the interference of the transmission signal to the received signal, the transmission signal can be sent through the second transmission channel with fewer devices, which can reduce the insertion loss of the transmission signal on the transmission channel and reduce the power consumption during signal transmission.

FIG. 3 is a structural block diagram of a radio frequency circuit in another embodiment. As shown in FIG. 3 , in one embodiment, the above-mentioned radio frequency circuit 200 further includes a switch module 250 . The switch module 250 can be electrically connected to the transmission module 220 , the first transmission path 230 and the second transmission path 240 respectively. The control unit 210 may be electrically connected to the switch module 250 .

The control unit 210 is further configured to send a first switching signal to the switch module 250 when in the first communication mode. The switch module 250 is configured to switch to the first closed state according to the first switch signal when receiving the first switch signal, so as to make the transmission module 220 and the first transmission path 230 conduct.

In some embodiments, the transmit path can be selected through physical device control. When in the first communication mode, the control unit 210 may control the switch module 250 to switch to the first closed state. In the first closed state, the transmitting module 220 is connected to the first transmitting channel 230 , the transmitting module 220 is disconnected from the second transmitting channel 240 , and the transmitting module 220 can be transmitted through the first transmitting channel 230 transmit a signal.

The control unit 210 is further configured to send a second switching signal to the switch module 250 when in the second communication mode. The switch module 250 is further configured to switch to the second closed state according to the second switch signal when receiving the second switch signal, so that the transmission module 220 and the second transmission path 240 are connected.

When in the second communication mode, the control unit 210 may control the switch module 250 to switch to the second closed state. In the second closed state, the transmission module 220 is disconnected from the first transmission channel 230 , the transmission module 220 and the second transmission channel 240 are connected, and the transmission module 220 can be transmitted through the second transmission channel 240 transmit a signal.

As an embodiment, the switch module 250 may include a single-pole double-throw switch, and the control unit 210 may control the closed state of the single-pole double-throw switch through the first switching signal and the second switching signal, respectively. Optionally, the first end of the SPDT switch can be connected to the transmitting module 220 , the second end can be connected to the first transmitting channel 230 , and the third end can be connected to the second transmitting channel 240 . The control unit 210 can control the first end and the second end of the SPDT switch to close in the first communication mode, and can control the first end and the third end of the SPDT switch to close in the second communication mode.

As another implementation manner, the switch module 250 may also include a first switch and a second switch, wherein the first switch may be connected to the transmitting module 220 and the first transmitting channel 230 respectively, and the second switch may be respectively connected to the transmitting module 220 and the second transmission channel 240 are connected. In the first communication mode, the control unit 210 can control the first switch to be closed and the second switch to be open, and in the second communication mode, it can control the second switch to be closed and the first switch to be open. It should be noted that, the switch module 250 may also use other switch devices, and is not limited to the above-mentioned modes.

In some embodiments, the control unit 210 can also directly control the transmission path of the transmission module 210 to transmit the transmission signal in different communication modes by means of program control.

In the embodiment of the present application, the adopted transmission channel can be selected and switched through the switch module, and the switching is performed directly in a physical manner, the switching logic is simple and convenient, and the accuracy is higher.

FIG. 4 is a structural block diagram of a first transmission path in an embodiment. As shown in FIG. 4 , in one embodiment, the first transmit path 230 may include a filter-type device 232 , a switch-type device 234 , a combiner 236 and a test socket 238 , wherein the filter-type device 232 may be respectively connected with the switch-type device 232 . The similar device 234 and the transmitting module 220 are electrically connected, and the combiner 236 can be electrically connected to the switching device 234 and the test socket 238 respectively.

The filter device 232 can be used to filter the transmit signal transmitted by the transmit module 220 .

In one embodiment, the filter device 232 may include a first filter, and the first filter may be used to perform a first filtering process on the transmit signal transmitted by the transmit module 220 to attenuate harmonics in the transmit signal. In the first communication mode, the multiple of the transmitting frequency band is in the receiving frequency band, and the harmonics generated by the transmitting signal will cause interference to the receiving end. The first filter can suppress the harmonic interference caused by the transmit signal in the first communication mode to the receive signal, prevent the sensitivity of the receiving end from decreasing, and make the transmit signal meet the requirements of the radio frequency index. Optionally, the first filter can include a harmonic filter, which can eliminate harmonics in the transmitted signal that will interfere with the received signal, such as the ENDC mode of B3+N78, the second harmonic of the transmitted signal in the B3 frequency band. The second harmonic will interfere with the received signal in the N78 frequency band, and the harmonic filter can eliminate the second harmonic of the transmitted signal in the B3 frequency band.

It should be noted that the filter-type device 232 may also include other filters, such as band-pass filters, etc., and is not limited to the above-mentioned first filter.

The switch device 234 can be used to support uplink sounding reference signal (Sounding Reference Signal, SRS) functions, and the SRS can perform channel quality and estimation, beam management, etc., to assist in uplink scheduling, uplink power control, and the like.

The combiner 236 can be used to combine multiple transmit signals of different frequency bands and output them to the antenna. The combined transmit signal can be transmitted to the network device through one antenna without switching between multiple different antennas. .

The test seat 238 can be used to test the performance, electrical connection, etc. of each device on the transmission path, so as to ensure that each device meets the functional index.

It should be noted that, the first emission path 230 may also include other devices, which are not limited to those shown in FIG. 4 , and may also be omitted for some devices (eg, the test socket 238 ).

As shown in FIG. 5 , in one embodiment, the first transmission channel 230 may include a first sub-channel 510 and a second sub-channel 520 , wherein the first sub-channel 510 may be electrically connected to the transmission module 220 , and the first sub-channel 510 may be electrically connected to the transmission module 220 . The passage 520 can be electrically connected with the transmitting module 220 , further, the first sub-pass 510 can be electrically connected with the switch module 250 , and the second sub-pass 510 can be electrically connected with the switch module 250 .

In one embodiment, the first sub-channel 510 is used to support the transmission signal of the first network standard, and the second sub-channel 520 is used to support the transmission signal of the second network standard, and the first network standard is different from the second network standard. The network standard refers to the type of network to be accessed. The first sub-channel 510 and the second sub-channel 520 can respectively support signal transmission of different network standards. For example, the first sub-channel 510 can be used to transmit 4G signals, and the second sub-channel 520 It can be used to transmit 5G signals, etc., but not limited to this.

In another embodiment, the first sub-channel 510 is used to support the transmission signal of the first transmission frequency band, and the second sub-channel 520 is used to support the transmission signal of the second transmission frequency band, and the first transmission frequency band is different from the second transmission frequency band. In the first communication mode, a combination of multiple different frequency bands is usually used, and the first sub-channel 510 and the second sub-channel 520 can respectively support signal transmission of different transmission frequency bands. For example, the first sub-channel 510 can be used to transmit LB and MB signals. , the second sub-channel 520 can be used to transmit HB signals and the like.

Optionally, the first sub-channel 510 and the second sub-channel 520 may be electrically connected to the same antenna, or may be connected to different antennas respectively, wherein the first sub-channel 510 is electrically connected to the first antenna, and the second sub-channel is electrically connected to the first antenna. The two antennas are electrically connected. Signals of different network standards or different frequency bands are transmitted through different antennas, which can improve the success rate and stability of signal transmission.

Optionally, the devices included in the first sub-channel 510 and the second sub-channel 520 may be the same or different. For example, the first communication mode is an ENDC mode with a frequency band combination of B3+N78, wherein the first sub-channel 510 can be used for Supports the transmission of signals in the B3 frequency band, and the second sub-channel 520 can be used to support the transmission of signals in the N78 frequency band. Since the transmitted signal of the B3 frequency band will cause harmonic interference to the received signal of the N78, the first sub-channel 510 may include the first sub-channel 510. filter, and the second sub-pass may not include the first filter.

Optionally, the first sub-via 510 and the second sub-via 520 can also share some specific devices. For example, the first sub-via 510 and the second sub-via 520 can share the above-mentioned combiner and test socket. The device can combine the transmitted signals of the two sub-channels and transmit them to the same antenna, and transmit signals to the network equipment through the antenna, which can reduce the hardware cost.

In some embodiments, the first transmit path 230 may not only include two sub-paths, but may include a larger number of sub-paths for supporting signal transmission in different frequency bands under different network standards. For example, sub-path 1 supports LB in 4G , MB signals, sub-channel 2 supports HB signals in 4G, sub-channel 3 supports LB and MB signals in 5G, and sub-channel 4 supports HB signals in 5G, etc., but not limited to this. The specific number of sub-channels can be set according to implementation requirements.

In the embodiment of the present application, the first transmission channel may include sub-channels for supporting different network standards or different frequency bands, and using different sub-channels to transmit signals of different network standards or different frequency bands in the first communication mode can reduce the The interference of the transmitted signal between the network standard or different frequency bands ensures the stability of the signal transmission.

In some embodiments, the second transmission path 240 may not be a pure impedance circuit, and one or more devices may be included in the second transmission path 240 . FIG. 6 is a structural block diagram of a radio frequency circuit in another embodiment. As shown in FIG. 6 , the second transmission path 240 may include a second filter 242 , and the second filter may be electrically connected to the transmission module 220 . Further, the second filter 242 may be electrically connected with the switch module 250 .

In the second communication mode, the switch module 250 is in the second closed state, and the transmission module 220 and the second transmission path 240 are connected. The second filter 242 is configured to perform a second filtering process on the transmit signal transmitted by the transmit module 220 to attenuate components in the transmit signal other than the target transmit frequency band. The target transmission frequency band is the transmission frequency band in the second communication mode.

Optionally, the second filter 242 may include a band-pass filter, and the band-pass filter may be used to allow the transmission signal of the target transmission frequency band to pass, and filter out the components of the transmission signal other than the target transmission frequency band, which can reduce the second transmission. The transmitted signal transmitted on the channel is interfered by signals of other frequency bands, which improves the success rate and stability of transmission.

In some embodiments, in order to save hardware cost, the first transmit path 230 and the second transmit path 240 may share components. Exemplarily, the first transmission path 230 and the second transmission path 240 can share the test socket 238. If the second transmission path 240 is a pure impedance circuit, one end of the pure impedance circuit can be connected to the switch module 250, and the other end is connected to the first transmission path 250. A test socket 238 in the transmit path 230 is connected. In the second communication mode, the transmission signal sent by the transmission module 220 can directly reach the test socket 238 through the pure impedance circuit, and then be transmitted to the antenna.

Optionally, as shown in FIG. 6 , the second transmission path 240 includes a second filter 242 , and the second filter 242 can be electrically connected to the test socket 238 of the first transmission path 230 . After the second filter 242 performs the second filtering process on the transmit signal sent by the transmit module 220, the filtered transmit signal can be sent to the test socket 238, and then transmitted to the antenna.

In some embodiments, the second transmission path 240 may also include sub-paths for supporting transmission signals of different network standards or different frequency bands. The sub-channels are set in a similar manner, and are not repeated here. Using different sub-channels to transmit signals of different network standards or different frequency bands in the second communication mode can reduce the interference of transmitted signals between different network standards or different frequency bands, and ensure the stability of signal transmission.

In the embodiment of the present application, in the second communication mode, the transmission signal may be filtered by the second filter in the second transmission path 240 to filter out signals outside the transmission frequency band in the second communication mode, which ensures that The success rate and stability of signal transmission.

As shown in FIG. 7 , in one embodiment, a terminal device 700 is provided, which may include the radio frequency circuit 200 described in the foregoing embodiments.

As shown in FIG. 8 , in one embodiment, a signal transmission method is provided, which can be applied to the above-mentioned terminal equipment, and the terminal equipment can include the radio frequency circuit 200 described in the above-mentioned various embodiments. The signal transmission method may include the following steps:

Step 810: When the terminal device is in the first communication mode, the transmission signal is processed through the first transmission path, and the processed transmission signal is sent to the network device to suppress the transmission signal in the first communication mode from affecting the received signal. interference.

Step 820, when the terminal device is in the second communication mode, send a transmission signal to the network device through the second transmission path. Wherein, the transmitted signal in the second communication mode does not interfere with the received signal, and the number of devices included in the second channel is smaller than the number of devices included in the first channel.

In the embodiment of the present application, when the first communication mode is in the first communication mode, the transmission signal is processed through the first transmission path, and the processed transmission signal is sent to the network device, so that the transmission signal in the first communication mode can be suppressed from receiving the transmission signal. Signal interference, when in the second communication mode, since the transmitted signal in the second communication mode does not interfere with the received signal, the signal can be transmitted to the network device through the second transmission channel, and the communication mode can be distinguished. Different communication modes Different transmission channels are used to send the transmission signal. When it is not necessary to suppress the interference of the transmission signal to the received signal, the transmission signal can be sent through the second transmission channel with fewer components, which can reduce the insertion loss of the transmission signal on the transmission channel and reduce the power consumption during signal transmission.

In one embodiment, step 810 includes: when the terminal device is in the first communication mode, controlling the switch module to switch to a first closed state, so that the transmission module is connected to the first transmission path, and the first transmission path The transmission signal transmitted by the transmission module is processed, and then the processed transmission signal is sent to the network device.

Step 820 includes: when the terminal device is in the second communication mode, controlling the switch module to switch to the second closed state, so that the transmission module is connected to the second transmission path, and the transmission module is transmitted through the second transmission path. The signal is processed, and the processed transmission signal is sent to the network device.

In the embodiment of the present application, the adopted transmission channel can be selected and switched through the switch module, and the switching is performed directly in a physical manner, the switching logic is simple and convenient, and the accuracy is higher.

In one embodiment, the step of processing the transmission signal transmitted by the transmission module through the first transmission path includes: performing a first filtering process on the transmission signal through a first filter in the first transmission path, so as to attenuate the transmission signal in the transmission signal. The harmonics in the transmitted signal are in the receiving frequency band in the first communication mode.

In one embodiment, the first transmit channel includes a first sub-channel and a second sub-channel.

Step 810 includes: when the terminal device is in the first communication mode, processing the transmission signal of the first network standard/first transmission frequency band through the first sub-channel, sending the processed transmission signal to the network device, and using the first sub-channel to process the transmission signal of the first network standard/first transmission frequency band. The second sub-channel processes the transmission signal of the second network standard/second transmission frequency band, and sends the processed transmission signal to the network device.

In the embodiment of the present application, the first transmission channel may include sub-channels for supporting different network standards or different frequency bands, and using different sub-channels to transmit signals of different network standards or different frequency bands in the first communication mode can reduce the The interference of the transmitted signal between the network standard or different frequency bands ensures the stability of the signal transmission.

In one embodiment, the second transmit path includes a second filter. Step 820 includes: when the terminal device is in the second communication mode, performing a second filtering process on the transmit signal through a second filter in the second transmit path, so as to attenuate components in the transmit signal except the target transmit frequency band, and send the signal to the transmit signal. The network device sends the filtered transmission signal.

In the embodiment of the present application, in the second communication mode, the transmission signal can be filtered by the second filter in the second transmission path, so as to filter out the signal outside the transmission frequency band in the second communication mode, which can ensure the signal Transmission success rate and stability.

As shown in FIG. 9 , in one embodiment, a signal transmission apparatus 900 is provided, which can be applied to the above-mentioned terminal equipment, and the terminal equipment can include the radio frequency circuit 200 described in the above-mentioned various embodiments. The signal transmission device 900 may include a first transmission module 910 and a second transmission module 920 .

The first transmission module 910 is configured to process the transmission signal through the first transmission path when the terminal device is in the first communication mode, and send the processed transmission signal to the network device to suppress transmission in the first communication mode Signal interference to the received signal.

The second transmission module 920 is configured to send a transmission signal to the network device through the second transmission path when the terminal device is in the second communication mode. Wherein, the transmitted signal in the second communication mode does not interfere with the received signal, and the number of devices included in the second channel is smaller than the number of devices included in the first channel.

In the embodiment of the present application, when the first communication mode is in the first communication mode, the transmission signal is processed through the first transmission path, and the processed transmission signal is sent to the network device, so that the transmission signal in the first communication mode can be suppressed from receiving the transmission signal. Signal interference, when in the second communication mode, since the transmitted signal in the second communication mode does not interfere with the received signal, the signal can be transmitted to the network device through the second transmission channel, and the communication mode can be distinguished. Different communication modes Different transmission channels are used to send the transmission signal. When it is not necessary to suppress the interference of the transmission signal to the received signal, the transmission signal can be sent through the second transmission channel with fewer devices, which can reduce the insertion loss of the transmission signal on the transmission channel and reduce the power consumption during signal transmission.

In one embodiment, the first transmission module 910 is further configured to control the switch module to switch to the first closed state when the terminal device is in the first communication mode, so that the transmission module is connected to the first transmission path, and the A transmission channel processes the transmission signal transmitted by the transmission module, and then sends the processed transmission signal to the network device.

The second transmission module 920 is further configured to control the switch module to switch to the second closed state when the terminal device is in the second communication mode, so that the transmission module is connected to the second transmission path, and the transmission mode is connected to the transmission mode through the second transmission path. The transmission signal transmitted by the group is processed, and then the processed transmission signal is sent to the network device.

In the embodiment of the present application, the adopted transmission channel can be selected and switched through the switch module, and the switching is performed directly in a physical manner, the switching logic is simple and convenient, and the accuracy is higher.

In one embodiment, the first transmitting module 910 is further configured to perform a first filtering process on the transmitting signal through the first filter in the first transmitting channel, so as to attenuate the harmonics in the transmitting signal, and the harmonics in the transmitting signal in the receive frequency band in the first communication mode.

In one embodiment, the first transmit channel includes a first sub-channel and a second sub-channel. The first transmitting module 910 includes a first transmitting unit and a second transmitting unit.

The first transmission unit is configured to process the transmission signal of the first network standard/first transmission frequency band through the first sub-channel when the terminal device is in the first communication mode, and send the processed transmission signal to the network device.

The second transmission unit is configured to process the transmission signal of the second network standard/second transmission frequency band through the second sub-channel, and send the processed transmission signal to the network device.

In the embodiment of the present application, the first transmission channel may include sub-channels for supporting different network standards or different frequency bands, and using different sub-channels to transmit signals of different network standards or different frequency bands in the first communication mode can reduce the The interference of the transmitted signal between the network standard or different frequency bands ensures the stability of the signal transmission.

In one embodiment, the second transmitting module 920 is further configured to perform a second filtering process on the transmitted signal through the second filter in the second transmission path when the terminal device is in the second communication mode, so as to attenuate the content of the transmitted signal. components other than the target transmit frequency band, and send the filtered transmit signal to the network device.

In the embodiment of the present application, in the second communication mode, the transmission signal can be filtered through the second filter in the second transmission path, so as to filter out the signal outside the transmission frequency band in the second communication mode, which can ensure the signal Transmission success rate and stability.

FIG. 10 is a structural block diagram of a terminal device in another embodiment. As shown in FIG. 10, the terminal device may include: a radio frequency module 1010, a memory 1020, an input unit 1030, a display unit 1040, a sensor 1050, an audio circuit 1060, a WiFi (Wireless Fidelity, wireless fidelity) module 1070, a processor 1080, and Power supply 1090 and other components. Those skilled in the art can understand that the structure of the terminal device shown in FIG. 10 does not constitute a limitation on the terminal device, and the terminal device may include more or less components than the one shown, or combine some components, or different components layout.

The radio frequency module 1010 can be used for receiving and sending signals during sending and receiving of information or during a call. In particular, after receiving the downlink information of the base station, it is processed by the processor 1080; in addition, it sends the designed uplink data to the base station. Generally, the radio frequency module 1010 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier (LNA), a duplexer, and the like. In addition, the radio frequency module 1010 can also communicate with the network and other devices through wireless communication. The above wireless communication can use any communication standard or protocol, including but not limited to global system of mobile communication (GSM), general packet radio service (GPRS), code division multiple access (code division multiple access) , CDMA), wideband code division multiple access (WCDMA), long term evolution, email, short message service (short messaging service, SMS) and the like.

The memory 1020 may be used to store software programs and modules, and the processor 1080 executes various functional applications and data processing of the terminal device by running the software programs and modules stored in the memory 1020 . The memory 1020 may mainly include a stored program area and a stored data area, wherein the stored program area may store an operating system, an application program required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; Data (such as audio data, phone book, etc.) created by the use of the terminal device, etc. Additionally, memory 1020 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The input unit 1030 may be used to receive input numerical or character information, and generate key signal input related to user settings and function control of the terminal device. Specifically, the input unit 1030 may include a touch panel 1032 and other input devices 1034 . The touch panel 1032, also referred to as a touch screen, collects touch operations by the user on or near it (such as the user's finger, stylus, etc., any suitable object or attachment on or near the touch panel 1032). operation), and drive the corresponding connection device according to the preset program. Optionally, the touch panel 1032 may include two parts, a touch detection device and a touch controller. Among them, the touch detection device detects the user's touch orientation, detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into contact coordinates, and then sends it to the touch controller. To the processor 1080, and can receive the command sent by the processor 1080 and execute it. In addition, the touch panel 1032 can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic waves. In addition to the touch panel 1032 , the input unit 1030 may also include other input devices 1034 . Specifically, other input devices 1034 may include, but are not limited to, one or more of physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, joysticks, and the like.

The display unit 1040 may be used to display information input by the user or information provided to the user and various menus of the terminal device. The display unit 1040 may include a display panel 1042. Alternatively, the display panel 1042 may be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like. Further, the touch panel 1032 can cover the display panel 1042, and when the touch panel 1032 detects a touch operation on or near it, it transmits it to the processor 1080 to determine the type of the touch event, and then the processor 1080 determines the type of the touch event according to the touch event. Type provides corresponding visual output on display panel 1042. Although in FIG. 10 , the touch panel 1032 and the display panel 1042 are used as two independent components to realize the input and input functions of the terminal device, but in some embodiments, the touch panel 1032 and the display panel 1042 may be integrated And realize the input and output functions of the terminal equipment.

The terminal device may also include at least one sensor 1050, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor, wherein the ambient light sensor may adjust the brightness of the display panel 1042 according to the brightness of the ambient light, and the proximity sensor may turn off the display panel 1042 and the display panel 1042 when the terminal device is moved to the ear. / or backlight. As a kind of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in all directions (generally three axes), and can detect the magnitude and direction of gravity when stationary, and can be used for applications that identify the attitude of terminal devices (such as horizontal and vertical screen switching, related games, magnetometer attitude calibration), vibration recognition related functions (such as pedometer, tapping), etc.; as for other sensors such as gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc. that can be configured on the terminal device, here No longer.

The audio circuit 1060, the speaker 1062, and the microphone 1064 can provide an audio interface between the user and the terminal device. The audio circuit 1060 can convert the received audio data into an electrical signal, and transmit it to the speaker 1062, and the speaker 1062 converts it into a sound signal and outputs it; After receiving, it is converted into audio data, and then the audio data is output to the processor 1080 for processing, and then sent to, for example, another terminal device through the radio frequency module 1010, or the audio data is output to the memory 1020 for further processing.

WiFi is a short-distance wireless transmission technology. The terminal device can help users to send and receive emails, browse web pages, and access streaming media through the WiFi module 1070. It provides users with wireless broadband Internet access.

The processor 1080 is the control center of the terminal device, using various interfaces and lines to connect various parts of the entire terminal device, by running or executing the software programs and/or modules stored in the memory 1020, and calling the data stored in the memory 1020. , perform various functions of the terminal equipment and process data, so as to monitor the terminal equipment as a whole. Optionally, the processor 1080 may include one or more processing units; preferably, the processor 1080 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, etc. , the modem processor mainly deals with wireless communication. It can be understood that, the above-mentioned modulation and demodulation processor may not be integrated into the processor 1080.

In one embodiment, the modulation and demodulation processor and the radio frequency module 1010 may form a radio frequency circuit in this embodiment of the present application, the radio frequency module 1010 may be provided with a first transmission path and a second transmission path, and the modulation and demodulation processor may be used as a Control unit in radio frequency circuits.

The terminal device also includes a power supply 1090 (such as a battery) for supplying power to various components. Preferably, the power supply can be logically connected to the processor 1080 through a power management system, so as to manage charging, discharging, and power consumption management functions through the power management system. Although not shown, the terminal device may also include a camera, a Bluetooth module, and the like, which will not be repeated here.

In one embodiment, the computer program stored in the memory 1020, when executed by the processor 1080, causes the processor 1080 to implement the methods described in the above embodiments.

The embodiments of the present application disclose a computer-readable storage medium, which stores a computer program, wherein, when the computer program is executed by a processor, the methods described in the foregoing embodiments are implemented.

The embodiments of the present application disclose a computer program product, the computer program product includes a non-transitory computer-readable storage medium storing a computer program, and the computer program can be executed by a processor to implement the methods described in the foregoing embodiments.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium , when the program is executed, it may include the flow of the above-mentioned method embodiments. The storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM), or the like.

Any reference to a memory, storage, database or other medium as used herein may include non-volatile and/or volatile memory. Suitable nonvolatile memory may include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM), which acts as external cache memory. By way of illustration and not limitation, RAM is available in various forms such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous Link (Synchlink) DRAM (SLDRAM), Memory Bus (Rambus) Direct RAM (RDRAM), Direct Memory Bus Dynamic RAM (DRDRAM), and Memory Bus Dynamic RAM (RDRAM).

It is to be understood that reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic associated with the embodiment is included in at least one embodiment of the present application. Thus, appearances of "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily necessarily referring to the same embodiment. Furthermore, the specific features, structures or characteristics may be combined in any suitable manner in one or more embodiments. Those skilled in the art should also know that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present application.

In the various embodiments of the present application, it should be understood that the size of the sequence numbers of the above-mentioned processes does not imply an inevitable sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, and should not be implemented in the present application. The implementation of the examples constitutes no limitation.

The units described above as separate components may or may not be physically separated, and components displayed as units may or may not be object units, and may be located in one place or distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

The above-mentioned integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer-accessible memory. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the whole or part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a memory , including several requests to cause a computer device (which may be a personal computer, a server, or a network device, etc., specifically a processor in the computer device) to execute some or all of the steps of the above methods in the various embodiments of the present application.

A radio frequency circuit, a terminal device, a signal transmission method, and a storage medium disclosed in the embodiments of the present application have been described in detail above. The principles and implementations of the present application are described with specific examples. The descriptions of the above embodiments are only Used to help understand the methodology of the present application and its core ideas. At the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific embodiments and application scope. To sum up, the content of this specification should not be construed as a limitation to the present application.

Claims (10)

1. A radio frequency circuit is characterized by comprising a transmitting module, a first transmitting path, a second transmitting path and a control unit, wherein the transmitting module is electrically connected with the first transmitting path and the second transmitting path respectively;

the control unit is configured to control the transmitting module to transmit a transmitting signal to the first transmitting path when the control unit is in a first communication mode, where the transmitting signal in the first communication mode interferes with a received signal;

the first transmitting path is used for filtering components which can interfere with a received signal in a transmitting signal transmitted by the transmitting module, and sending the processed transmitting signal to network equipment so as to inhibit the interference of the transmitting signal in the first communication mode on the received signal;

the control unit is further configured to control the transmitting module to transmit a transmitting signal to the second transmitting access when the control unit is in the second communication mode, where the transmitting signal does not interfere with a receiving signal in the second communication mode;

and the second transmitting path is used for transmitting the transmitting signal transmitted by the transmitting module to the network equipment.

2. The circuit of claim 1, wherein the rf circuit further comprises a switch module electrically connected to the transmit module, the first transmit path and the second transmit path, respectively, and the control unit is electrically connected to the switch module;

the control unit is further used for sending a first switching signal to the switch module when the control unit is in a first communication mode;

the switch module is used for switching to a first closed state according to the first switching signal when receiving the first switching signal, so that the transmitting module is conducted with the first transmitting channel;

the control unit is further configured to send a second switching signal to the switch module when the control unit is in a second communication mode;

the switch module is further configured to switch to a second closed state according to the second switching signal when receiving the second switching signal, so that the transmitting module is conducted with the second transmitting path.

3. The circuit of claim 1, wherein the first transmit path comprises a first filter electrically connected to the transmit module;

the first filter is configured to perform first filtering processing on a transmission signal transmitted by the transmission module to attenuate a harmonic in the transmission signal, where the harmonic in the transmission signal is in a reception frequency band in the first communication mode.

4. The circuit of any one of claims 1 to 3, wherein the first transmission path comprises a first sub-path and a second sub-path, the first sub-path is electrically connected to the transmission module, and the second sub-path is electrically connected to the transmission module;

the first sub-channel is used for supporting a transmitting signal of a first network standard, the second sub-channel is used for supporting a transmitting signal of a second network standard, and the first network standard is different from the second network standard; or

The first sub-path is configured to support a transmission signal of a first transmission frequency band, the second sub-path is configured to support a transmission signal of a second transmission frequency band, and the first transmission frequency band is different from the second transmission frequency band.

5. The circuit of claim 1, wherein the second transmit path is a pure impedance circuit.

6. The circuit of claim 1, wherein the second transmit path includes a second filter, the second filter being electrically connected to the transmit module;

the second filter is configured to perform second filtering processing on the transmission signal transmitted by the transmission module to attenuate components in the transmission signal except for a target transmission frequency band, where the target transmission frequency band is a transmission frequency band in the second communication mode.

7. A terminal device, characterized in that it comprises a circuit according to any one of claims 1 to 6.

8. A signal transmission method is applied to a terminal device, and comprises the following steps:

when the terminal equipment is in a first communication mode, filtering components which can generate interference on a received signal in a transmitting signal through a first transmitting path, and sending the processed transmitting signal to network equipment so as to inhibit the interference of the transmitting signal in the first communication mode on the received signal;

and when the terminal equipment is in a second communication mode, transmitting a transmitting signal to the network equipment through a second transmitting path, wherein the transmitting signal in the second communication mode does not generate interference on a receiving signal, and the number of devices in the second transmitting path is smaller than that in the first transmitting path.

9. A terminal device, comprising a memory and a processor, the memory having stored therein a computer program which, when executed by the processor, causes the processor to carry out the method of claim 8.

10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method of claim 8.

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