CN110535483B

CN110535483B - Communication module and terminal

Info

Publication number: CN110535483B
Application number: CN201910684514.6A
Authority: CN
Inventors: 曾伟才; 阳美文; 叶桦; 杜英强; 刘道明
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-07-26
Filing date: 2019-07-26
Publication date: 2021-01-15
Anticipated expiration: 2039-07-26
Also published as: CN110535483A; WO2021017965A1

Abstract

The embodiment of the application provides a communication module and a terminal, which can split the communication function of the terminal to a plurality of communication modules. And 1 communication module is a main module, and the rest communication modules are auxiliary modules. The main module is provided with BB circuitry and, correspondingly, RFICs for the sub-modules, without the need for the sub-modules to be provided with such circuitry. Therefore, when the terminal simultaneously comprises the secondary module and the main module, the FEM circuit arranged on the secondary module, the BB circuit arranged on the main module and the RFIC form a radio frequency channel, so that the communication function of the secondary module is realized, the cost of the terminal is reduced, the size of a single communication module is reduced, and the communication module can meet the requirements of a mounting process. In addition, because the communication functions supported by the plurality of communication modules are different, the communication modules of the terminal can be flexibly set according to the requirements of the user on the communication functions, so that the configuration flexibility of the communication modules is improved, the cost of the terminal is further reduced, and the user experience is also improved.

Description

Communication module and terminal

Technical Field

The embodiment of the application relates to a communication technology, in particular to a communication module and a terminal.

Background

The internet of vehicles, namely the internet of things of vehicles, is characterized in that vehicles in driving are used as information sensing objects, communication between vehicles and X (such as vehicle-to-vehicle, vehicle-to-person, vehicle-to-road, vehicle-to-service platform and the like) is realized by means of vehicle-mounted equipment on the vehicles, the overall intelligent driving level of the vehicles is improved, safe, comfortable, intelligent and efficient driving feeling and traffic service are provided for users, meanwhile, the traffic operation efficiency is improved, and the intelligent level of social traffic service is improved. It can be seen that the internet of vehicles exhibits the following features: the Internet of vehicles can provide guarantee for the distance between the vehicles, and the probability of collision accidents of the vehicles is reduced; the Internet of vehicles can help the vehicle owner to navigate in real time, and the efficiency of traffic operation is improved through communication with other vehicles and a network system.

The vehicle-mounted terminal for realizing the communication of the Internet of vehicles mainly comprises a communication module, a bottom plate and an antenna. The communication module is used for providing a communication function for the vehicle-mounted terminal. At present, some vehicle-mounted terminals realize the communication function of a multi-mode multi-frequency communication system through one communication module, and the communication function of a dual-card dual-active (DSDA) system, so that the requirements of users on a mobile network can be better met. However, the above two communication functions are realized by one communication module, which results in a large size of a single communication module, which is difficult to meet the requirements of the mounting process, and also fails to meet the flexible requirements of users for the communication functions.

Therefore, how to set the communication module of the vehicle-mounted terminal is an urgent problem to be solved.

Disclosure of Invention

The embodiment of the application provides a communication module and a terminal, which can meet the flexible requirements of a user on the communication function of the terminal and the requirements of a mounting process of the communication module.

In a first aspect, an embodiment of the present application provides a terminal, where the terminal includes: the terminal includes: a first communication module and a first antenna. Wherein the first communication module comprises: the calibration circuit comprises a baseband circuit, a first radio frequency integrated circuit, a first radio frequency front end module circuit, a second radio frequency integrated circuit and a calibration circuit.

The first receiving end of the baseband circuit is connected with the first receiving end of the first radio frequency integrated circuit, the second receiving end of the first radio frequency integrated circuit is connected with the sending end of the first radio frequency front end module circuit, the second sending end of the first radio frequency integrated circuit is connected with the receiving end of the first radio frequency front end module circuit, and the public end of the first radio frequency front end module circuit is connected with the first antenna. And the second receiving end of the baseband circuit is connected with the first transmitting end of the second radio frequency integrated circuit, and the second transmitting end of the baseband circuit is connected with the first receiving end of the second radio frequency integrated circuit.

The first control end of the baseband circuit is connected with the control end of the second radio frequency integrated circuit, the second control end of the baseband circuit is connected with the control end of the calibration circuit, the reference signal receiving sending end of the second radio frequency integrated circuit is connected with the receiving end of the calibration circuit, and the power measuring end of the second radio frequency integrated circuit is connected with the sending end of the calibration circuit. The baseband circuit is configured to calibrate the reception reference signal and the power measurement reference signal of the second rf integrated circuit through the calibration circuit.

As a possible implementation manner, the terminal further includes: a second communication module and a second antenna. Wherein the second communication module comprises a second radio frequency front end module circuit. The second receiving end of the second radio frequency integrated circuit is connected with the sending end of the second radio frequency front end module circuit, the second sending end of the second radio frequency integrated circuit is connected with the receiving end of the second radio frequency front end module circuit, the common end of the second radio frequency front end module circuit is connected with the first transceiving end of the calibration circuit, and the second transceiving end of the calibration circuit is connected with the second antenna. The baseband circuit is further configured to calibrate the transmit power parameter and the receive power parameter of the second rf integrated circuit through the calibration circuit.

Optionally, the calibration circuit and the second communication module are both multiple, and each calibration circuit corresponds to one second communication module.

The communication function of the terminal is split into a plurality of communication modules through the method, wherein 1 communication module is a main module, and the rest communication modules are auxiliary modules. The main module is provided with BB circuitry and, correspondingly, RFICs for the sub-modules, without the need for the sub-modules to be provided with such circuitry. Therefore, when the terminal simultaneously comprises the secondary module and the main module, the FEM circuit arranged on the secondary module, the BB circuit arranged on the main module and the RFIC form a radio frequency channel, so that the communication function of the secondary module is realized, the cost of the terminal is reduced, the size of a single communication module is reduced, and the communication module can meet the requirements of a mounting process. In addition, because the communication functions supported by the plurality of communication modules are different, the communication modules of the terminal can be flexibly set according to the requirements of the user on the communication functions, so that the configuration flexibility of the communication modules is improved, the cost of the terminal is further reduced, and the user experience is also improved.

As a possible implementation, the first communication module further includes a power management integrated circuit. The power management integrated circuit is used for supplying power to the first communication module and the second communication module. Through the mode, the size of the second communication module can be further reduced, so that the area sum of the communication modules on the terminal can be reduced, the size of the bottom plate for bearing the communication modules on the terminal can be reduced, and the size of the terminal is reduced.

As a possible implementation, the first communication module further includes a storage circuit. The storage circuit is connected with the read-write end of the baseband circuit and can provide a storage function.

As a possible implementation manner, the baseband circuit may perform radio frequency calibration on the second radio frequency integrated circuit, or perform radio frequency calibration on a sub-module corresponding to the second radio frequency integrated circuit, as follows:

calibration for received reference signals: the baseband circuit may control the second rf integrated circuit to send a receiving reference signal of a preset sending power to the calibration circuit according to the receiving frequency of the second rf integrated circuit, and obtain a first mapping relationship between the receiving power and the sending power of the receiving reference signal of the second rf integrated circuit.

For receive power parameter calibration: the baseband circuit may control the second rf integrated circuit to send, through the calibration circuit, a calibrated receive reference signal corresponding to a preset sending power to the second rf front-end module circuit according to the first mapping relationship. The second rf integrated circuit may detect the receive power of the calibrated received reference signal returned by the second rf front-end module circuit. The baseband circuit may obtain a third mapping relationship between the transmission power and the reception power of the calibrated received reference signal.

Calibration for power measurement reference: the signal source is connected with the first transceiving end of the calibration circuit. The signal source may send the power measurement reference signal to the second rf integrated circuit through the calibration circuit according to a preset received power of the power measurement reference signal of the second rf integrated circuit. The second rf integrated circuit may receive a power measurement reference signal and obtain a received power of the received power measurement reference signal. The baseband circuitry may obtain a second mapping relationship of transmit power and receive power of a power measurement reference signal of the second radio frequency integrated circuit.

For transmit power parameter calibration: the baseband circuit may control the second rf integrated circuit to send a calibrated power measurement reference signal corresponding to a preset sending power to the second rf front-end module circuit according to the second mapping relationship. The second rf integrated circuit may detect the received power of the calibrated power measurement reference signal returned by the second rf front-end module circuit through the calibration circuit. The baseband circuit may obtain a fourth mapping relationship between the transmission power and the reception power of the calibrated power measurement reference signal.

After the first to fourth mapping relationships are obtained, when a subsequent terminal performs communication, the power actually required may be obtained according to the mapping relationships to perform signal processing.

As a possible implementation, the calibration circuit may include: a first switch and a coupler. A first end of the first switch is connected to the first end of the coupler, a second end of the first switch is grounded, a third end of the first switch is a receiving end of the calibration circuit, and a fourth end of the first switch is a second transceiving end of the calibration circuit. The second end of the coupler is the first transceiving end of the calibration circuit, the third end of the coupler is grounded, and the fourth end of the coupler is the transmitting end of the calibration circuit. Through the calibration circuit, the baseband circuit can carry out radio frequency calibration on the second radio frequency integrated circuit, so that the secondary module corresponding to the second radio frequency integrated circuit can realize a communication function.

As a possible implementation, the second radio frequency integrated circuit may include: the device comprises a sending unit, a mixer, an amplifier and a second switch. The transmitting unit is connected with a first end of the second switch sequentially through the frequency mixer and the amplifier, a second end of the second switch is a reference signal receiving transmitting end of the second radio frequency integrated circuit, and a third end of the second switch is a second transmitting end of the second radio frequency integrated circuit. The transmitting unit is configured to provide a receiving reference signal when a path between the first end of the second switch and the second end of the second switch is turned on. Through the second radio frequency integrated circuit, the baseband circuit can carry out radio frequency calibration on the second radio frequency integrated circuit, so that the secondary module corresponding to the second radio frequency integrated circuit can realize a communication function.

In a second aspect, an embodiment of the present application provides a communication module, where the communication module is a first communication module, and the first communication module includes: the calibration circuit comprises a baseband circuit, a first radio frequency integrated circuit, a first radio frequency front end module circuit, a second radio frequency integrated circuit and a calibration circuit.

The first receiving end of the baseband circuit is connected with the first receiving end of the first radio frequency integrated circuit, the second receiving end of the first radio frequency integrated circuit is connected with the sending end of the first radio frequency front end module circuit, the second sending end of the first radio frequency integrated circuit is connected with the receiving end of the first radio frequency front end module circuit, and the public end of the first radio frequency front end module circuit is connected with the first antenna of the terminal. And the second receiving end of the baseband circuit is connected with the first transmitting end of the second radio frequency integrated circuit, and the second transmitting end of the baseband circuit is connected with the first receiving end of the second radio frequency integrated circuit.

As a possible implementation manner, a second receiving end of the second radio frequency integrated circuit is connected to a sending end of a second radio frequency front end module circuit of a second communication module of the terminal, a second sending end of the second radio frequency integrated circuit is connected to a receiving end of the second radio frequency front end module circuit, a common end of the second radio frequency front end module circuit is connected to a first transceiving end of the calibration circuit, and a second transceiving end of the calibration circuit is connected to the second antenna. The baseband circuit is further configured to calibrate the transmit power parameter and the receive power parameter of the second rf integrated circuit through the calibration circuit.

As a possible implementation manner, the calibration circuit and the second communication module are both multiple, and each calibration circuit corresponds to one second communication module.

As a possible implementation, the first communication module further includes a power management integrated circuit. The power management integrated circuit is used for supplying power to the first communication module and the second communication module.

As a possible implementation, the first communication module further includes a storage circuit. The storage circuit is connected with the read-write end of the baseband circuit.

As a possible implementation, the calibration circuit may include: a first switch and a coupler. A first end of the first switch is connected to the first end of the coupler, a second end of the first switch is grounded, a third end of the first switch is a receiving end of the calibration circuit, and a fourth end of the first switch is a second transceiving end of the calibration circuit. The second end of the coupler is the first transceiving end of the calibration circuit, the third end of the coupler is grounded, and the fourth end of the coupler is the transmitting end of the calibration circuit.

As a possible implementation, the second radio frequency integrated circuit may include: the device comprises a sending unit, a mixer, an amplifier and a second switch. The transmitting unit is connected with a first end of the second switch sequentially through the frequency mixer and the amplifier, a second end of the second switch is a reference signal receiving transmitting end of the second radio frequency integrated circuit, and a third end of the second switch is a second transmitting end of the second radio frequency integrated circuit. The transmitting unit is configured to provide a receiving reference signal when a path between the first end of the second switch and the second end of the second switch is turned on.

The beneficial effects of the communication module provided in the second aspect and each possible implementation manner of the second aspect may refer to the beneficial effects brought by each possible implementation manner of the first aspect and the first aspect, which are not described herein again.

In a third aspect, an embodiment of the present invention further provides a radio frequency calibration method, where the radio frequency calibration method may be applied to a terminal provided in each possible implementation manner of the foregoing first aspect and first aspect, and/or a first communication module provided in each possible implementation manner of the foregoing second aspect and second aspect, and the method may calibrate a reception reference signal and a power measurement reference signal of the second radio frequency integrated circuit through the calibration circuit.

As a possible implementation, the method may further include: and calibrating the transmission power parameter and the receiving power parameter of the second radio frequency integrated circuit through the calibration circuit.

For example, according to the receiving frequency of the second rf integrated circuit, the second rf integrated circuit is controlled to send a receiving reference signal with a preset sending power to the calibration circuit, and a first mapping relationship between the receiving power and the sending power of the receiving reference signal of the second rf integrated circuit is obtained.

For another example, according to the first mapping relationship, the second rf integrated circuit is controlled to send a calibrated receiving reference signal corresponding to a preset sending power to the second rf front-end module circuit through the calibration circuit. And after the second radio frequency integrated circuit detects the calibrated receiving power of the receiving reference signal returned by the second radio frequency front-end module circuit, acquiring a third mapping relation between the transmitting power and the receiving power of the calibrated receiving reference signal.

For another example, the signal source is connected to the first transceiving end of the calibration circuit, and after the signal source transmits the power measurement reference signal to the second rf integrated circuit through the calibration circuit according to the preset receiving power of the power measurement reference signal of the second rf integrated circuit, and the second rf integrated circuit receives the power measurement reference signal and obtains the receiving power of the received power measurement reference signal, the second mapping relationship between the transmitting power and the receiving power of the power measurement reference signal of the second rf integrated circuit is obtained.

For another example, the second rf integrated circuit may be controlled to send the calibrated power measurement reference signal corresponding to the preset sending power to the second rf front-end module circuit according to the second mapping relationship. And after the second radio frequency integrated circuit detects the receiving power of the calibrated power measurement reference signal returned by the second radio frequency front-end module circuit through the calibration circuit, acquiring a fourth mapping relation between the sending power and the receiving power of the calibrated power measurement reference signal.

In a fourth aspect, an embodiment of the present application provides a terminal, where the terminal includes: a processor, a memory, a receiver, a transmitter; the receiver and the transmitter are both coupled to the processor, the processor controlling the receiving action of the receiver, the processor controlling the transmitting action of the transmitter;

wherein the memory is to store computer executable program code, the program code comprising instructions; when executed by a processor, the instructions cause the terminal to perform the method as provided by the third aspect or each possible implementation of the third aspect.

In a fifth aspect, embodiments of the present application provide a communication apparatus, which includes a unit, a module, or a circuit configured to perform the method provided in the third aspect or each possible implementation manner of the third aspect. The communication device may be a terminal device, or may be a module of the terminal device, for example, a chip of the terminal device.

In a sixth aspect, embodiments of the present application provide a computer program product comprising instructions that, when executed on a computer, cause the computer to perform the method of the third aspect or the various possible implementations of the third aspect.

In a seventh aspect, this application provides a computer-readable storage medium, which stores instructions that, when executed on a computer, cause the computer to perform the method in the third aspect or various possible implementations of the third aspect.

In an eighth aspect, an embodiment of the present application provides a chip, where a computer program is stored on the chip, and when the computer program is executed by the chip, the method in the third aspect or the various possible implementations of the third aspect is implemented.

The embodiment of the application provides a communication module and a terminal, and the communication function of the terminal is split into a plurality of communication modules through the method, wherein 1 communication module is a main module, and the rest communication modules are auxiliary modules. The main module is provided with BB circuitry and, correspondingly, RFICs for the sub-modules, without the need for the sub-modules to be provided with such circuitry. Therefore, when the terminal simultaneously comprises the secondary module and the main module, the FEM circuit arranged on the secondary module, the BB circuit arranged on the main module and the RFIC form a radio frequency channel, so that the communication function of the secondary module is realized, the cost of the terminal is reduced, the size of a single communication module is reduced, and the communication module can meet the requirements of a mounting process. In addition, because the communication functions supported by the plurality of communication modules are different, the communication modules of the terminal can be flexibly set according to the requirements of the user on the communication functions, so that the configuration flexibility of the communication modules is improved, the cost of the terminal is further reduced, and the user experience is also improved.

Drawings

FIG. 1 is a first schematic structural diagram of a conventional vehicle-mounted terminal;

FIG. 2 is a schematic structural diagram of a conventional vehicle-mounted terminal;

fig. 3 is a schematic structural diagram of a terminal according to an embodiment of the present application;

FIG. 4 is a schematic diagram of a calibration circuit according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of an RFIC according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of another terminal provided in the embodiment of the present application;

fig. 7 is a schematic diagram of a received reference signal calibration according to an embodiment of the present application;

fig. 8 is a schematic diagram of an MRX reference signal calibration provided in an embodiment of the present application;

fig. 9 is a schematic diagram of a calibration of a received power parameter according to an embodiment of the present application;

fig. 10 is a schematic diagram of a transmit power parameter calibration according to an embodiment of the present application.

Detailed Description

Fig. 1 is a first schematic structural diagram of a conventional in-vehicle terminal. As shown in fig. 1, the vehicle-mounted terminal for implementing communication in the internet of vehicles mainly includes a communication module, a bottom plate, an antenna 1, an antenna 2, and an antenna 3. Wherein, communication module includes: a baseband (BB) chip, a PMIC (power management integrated circuit) chip, two Radio Frequency Integrated Circuit (RFIC) chips (i.e., an RFIC0 chip and an RFIC1 chip), three RF front-end module (FEM) chips (i.e., an RF FEM0 chip, an RF FEM1 chip, and an RF FEM2 chip), a read-only memory (ROM), and the like. It should be understood that, in some embodiments, the FEM may also be directly used to represent the rf front-end module, and how to simply refer to the rf front-end module does not affect the embodiments of the present application. The following embodiments are described by taking an example in which the FEM represents the rf front-end module.

And the BB chip is used for synthesizing a baseband signal to be transmitted or decoding a received baseband signal. The BB circuit can be implemented, for example, by a BB chip.

The RFIC0 chip and the RFIC1 chip are used for converting a baseband signal to be transmitted into a radio frequency signal or converting a received radio frequency signal into a baseband signal.

And the PMIC chip is used for supplying power to the chip which needs to be supplied with power on the communication module. It should be understood that the PMIC chip needs to be connected to every chip on the communication module that needs to be powered. For simplicity, fig. 1 only illustrates the connection between the PMIC chip and the BB chip.

The FEM0 chip, the FEM1 chip and the FEM2 chip are used for amplifying and processing radio-frequency signals to be transmitted by the antenna so as to improve the transmission efficiency of the antenna.

And the ROM is used for providing a storage function.

The BB chip, the RFIC0 chip, the FEM0 chip and the antenna 0 form a radio frequency channel, which is used for realizing communication of communication systems except a cellular vehicle to electrical (C-V2X) communication system in one multi-mode multi-frequency communication system. For example, at least two communication systems are as follows: 2G communication system, 3G communication system, 4G communication system, 5G communication system and the like. The BB chip, the RFIC1 chip, the FEM1 chip and the antenna 1 form a radio frequency channel for realizing communication of a communication system other than the C-V2X communication system in another multi-mode multi-frequency communication system, so that the communication module can have a Dual Serial Dual Active (DSDA) function. The BB chip, the RFIC1 chip, the FEM2 chip and the antenna 2 form a radio frequency channel, which is used for realizing communication of a cellular vehicle to electrical (C-V2X) communication system in a multi-mode multi-frequency communication system.

As can be seen from the above description, the communication module of the vehicle-mounted terminal shown in fig. 1 has a function of supporting a multi-mode multi-frequency communication system and a communication function of a DSDA, so that the requirement of a user on a mobile network can be better met. However, the way of implementing the two communication functions by one communication module results in a large size of a single communication module, which is difficult to meet the requirements of the mounting process. For example, when the communication module is mounted on the bottom plate of the vehicle-mounted terminal in a welding manner, the communication module is large in size, and is prone to bending deformation during welding and heating, so that the communication module cannot be attached to the bottom plate (i.e., cannot be coplanar), poor welding occurs, and the requirements of a mounting process cannot be met.

In addition, different users may have different demands on the communication function of the in-vehicle terminal. For example, some users may need the vehicle-mounted terminal to support only the function of a communication system other than the C-V2X communication system in the multi-mode multi-frequency communication system, and some users may need the vehicle-mounted terminal to support the DSDA function, so that the communication module shown in fig. 1 cannot meet the flexible requirements of the users.

In view of these problems, the prior art provides another implementation manner of a communication module, which can install the communication module a and/or the communication module B according to the requirement of the user on the communication function of the vehicle-mounted terminal. Fig. 2 is a schematic structural diagram of a conventional in-vehicle terminal. As shown in fig. 2, the in-vehicle terminal includes a communication module a and a communication module B as an example. Wherein, communication module A includes: BB0 chip, PMIC0 chip, RFIC0 chip, FEM0 chip and ROM 0. The communication module B includes: BB1 chip, PMIC1 chip, RFIC1 chip, FEM1 chip, FEM2 chip, ROM1, etc. The PMIC0 chip is used to power the chips on the communication module a that require power. And the PMIC1 chip is used for supplying power to the chip needing power supply on the communication module B. The functionality of the individual chips can be seen from the description of the individual chips in fig. 1.

The BB0 chip, the RFIC0 chip, the FEM0 chip and the antenna 0 form a radio frequency channel, and the radio frequency channel is used for realizing communication of communication modes except a C-V2X communication mode in one-path multi-mode multi-frequency communication mode. The BB1 chip, the RFIC1 chip, the FEM1 chip and the antenna 1 form a radio frequency channel for realizing communication of a communication system except for a C-V2X communication system in another multi-mode multi-frequency communication system, so that the communication module can have a DSDA function. The BB1 chip, the RFIC1 chip, the FEM2 chip and the antenna 2 form a radio frequency channel for realizing communication of a C-V2X communication system in a multi-mode multi-frequency communication system.

As can be seen from the above description, the communication module a has a communication function of supporting a communication system other than the C-V2X communication system in the multi-mode multi-frequency communication system, the communication module B has a communication function of supporting the multi-mode multi-frequency communication system, and the communication module a and the communication module B can be added together to implement the function of the multi-mode multi-frequency communication system, and the function of the DSDA. In this way, the communication module a and/or the communication module B can be installed according to the user's demand for the communication function of the in-vehicle terminal. For example, some users may only install the communication module a when the vehicle-mounted terminal only supports the communication function of the communication system other than the C-V2X communication system in the multi-mode multi-frequency communication system. Or, when some users may need the vehicle-mounted terminal to support the DSDA function, the communication module a and the communication module B may be installed.

As for the communication module a and the communication module B, each communication module includes fewer chips than the communication module shown in fig. 1, and therefore, the size of a single communication module is smaller than that of the communication module shown in fig. 1, which can meet the requirements of the mounting process. However, since both communication modules are provided with the BB chip, the ROM, and the PMIC chip, etc., the sum of the areas of the two communication modules is large. When the vehicle-mounted terminal comprises the communication module A and the communication module B, a larger bottom plate is required for bearing, so that the volume of the vehicle-mounted terminal is larger, and the cost of the vehicle-mounted terminal is higher.

That is, although the communication module shown in fig. 2 is arranged in a manner that can meet the requirements of the mounting process, it can also meet the requirements of different users for different communication functions of the vehicle-mounted terminal. However, the volume of the vehicle-mounted terminal is large, the cost of the vehicle-mounted terminal is high, and the requirements of actual use cannot be met.

In view of the foregoing problems, embodiments of the present application provide an implementation manner of a communication module, which splits a communication function into a plurality of communication modules. Compared with the implementation of the communication module shown in fig. 2, 1 of the plurality of communication modules according to the embodiment of the present application is a main module, and the remaining communication modules are sub-modules. The communication module as the main module is provided with BB circuits and RFICs corresponding to the sub-modules, and the communication module as the sub-module does not need to be provided with these circuits. Therefore, when the terminal simultaneously comprises the secondary module and the main module, the FEM circuit arranged on the secondary module, the BB circuit arranged on the main module and the RFIC arranged on the main module form a radio frequency channel, so that the communication function of the secondary module is realized, the BB circuit and the RFIC do not need to be separately arranged on the secondary module, the cost of the terminal is reduced, the size of a single communication module is also reduced, and the communication module can meet the requirements of a mounting process. In addition, because the communication functions supported by the plurality of communication modules are different, the communication modules of the terminal can be flexibly set according to the requirements of users on the communication functions.

It should be understood that the Terminal according to the embodiments of the present application may also be referred to as a Terminal, a Terminal device, a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), or the like. The terminal device may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving) (also may be referred to as a vehicle-mounted terminal), a wireless terminal in remote surgery (remote medical supply), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like.

The technical solutions of the embodiments of the present application are described in detail below with reference to some embodiments. The following several embodiments may be combined with each other and may not be described in detail in some embodiments for the same or similar concepts or processes.

Fig. 3 is a schematic structural diagram of a terminal according to an embodiment of the present application. As shown in fig. 3, the terminal may include: a first communication module and a first antenna. The first communication module may be a main module of the terminal, and includes: the apparatus includes a BB circuit, a first RFIC, a first FEM circuit, a second RFIC, and a calibration circuit. Wherein the BB circuit is configured to synthesize, i.e., transmit, baseband signals or decode received baseband signals. The first RFIC and the second RFIC are configured to convert a baseband signal to be transmitted into a radio frequency signal, or convert a received radio frequency signal into a baseband signal. The first FEM circuit is used for amplifying and processing the radio frequency signal to be transmitted by the antenna.

The first receiving end of the BB circuit is connected with the first receiving end of the first RFIC, the second receiving end of the first RFIC is connected with the transmitting end of the first FEM, the second transmitting end of the first RFIC is connected with the receiving end of the first FEM, and the common end of the first FEM is connected with the first antenna. Thus, the BB circuit, the first RFIC, the first FEM circuit, and the first antenna form a radio frequency path (first radio frequency path for short) for implementing a communication function of the terminal. Taking the terminal as a vehicle-mounted terminal as an example, the first radio frequency channel may implement a communication function of a communication system other than the C-V2X communication system in the multi-mode multi-frequency communication system, or may implement a communication function of the C-V2X communication system.

The second receiving end of the BB circuit is connected to the first transmitting end of the second RFIC, and the second transmitting end of the BB circuit is connected to the first receiving end of the second RFIC. When a secondary module (i.e. a second communication module) is connected with the main module, the BB circuit and the second RFIC can realize the communication function of the secondary module together with the secondary module. Taking the terminal as a vehicle-mounted terminal as an example, assuming that the first communication module implements a communication function of a communication system other than the C-V2X communication system in the multi-mode multi-frequency communication system (which may also be referred to as a first radio frequency channel that may implement a communication function of a communication system other than the C-V2X communication system in the multi-mode multi-frequency communication system), the second communication module implements a communication function of the C-V2X communication system, or implements a communication function of a communication system other than the C-V2X communication system in the multi-mode multi-frequency communication system, so as to implement a DSDA communication function together with the first communication module.

Due to hardware deviation between devices on the communication module, radio frequency receiving parameters and transmitting parameters of the communication module are deviated. Therefore, before the communication module is shipped, the communication module needs to be calibrated by radio frequency. In this embodiment, in order to ensure that radio frequency calibration can be performed for the sub-module in which the BB circuit and RFIC are not provided, a calibration circuit is further provided on the first communication module as the main module. A first control terminal of a BB circuit of the first communication module is connected to a control terminal of the second RFIC, a second control terminal of the BB circuit is connected to a control terminal of the calibration circuit, a reference signal receiving transmit terminal of the second RFIC is connected to a receive terminal of the calibration circuit, and a power Measurement (MRX) terminal of the second RFIC is connected to a transmit terminal of the calibration circuit. The BB circuit of the first communication module may calibrate the reception reference signal and the MRX reference signal of the second RFIC by the calibration circuit.

With continued reference to fig. 3, optionally, when the second communication module is installed as a secondary module on the terminal according to the user's requirement for the communication function, the terminal may further include: a second communication module and a second antenna. Wherein the second communication module comprises: a second FEM. A second receiving end of the second RFIC is connected to the transmitting end of the second FEM, a second transmitting end of the second RFIC is connected to the receiving end of the second FEM, a common end of the second FEM is connected to the first transceiving end of the calibration circuit, and a second transceiving end of the calibration circuit is connected to the second antenna. The BB circuit, the second RFIC, the second FEM circuit, the calibration circuit, and the second antenna can form a radio frequency path (referred to as a second radio frequency path for short) for implementing a communication function of the sub-module.

After the second communication module is mounted on the terminal as a sub-module, the BB circuit of the first communication module may calibrate the transmission power parameter and the reception power parameter of the second RFIC by the calibration circuit. Therefore, through the calibration twice, the radio frequency calibration of the second radio frequency channel corresponding to the sub-module can be completed, so that the power of the signal transmitted through the second radio frequency channel can meet the communication requirement when the terminal communicates through the sub-module.

It should be understood that, the first radio frequency path on the first communication module also needs to be subjected to radio frequency calibration accordingly, but since the first communication module is provided with all circuits (i.e. the BB circuit, the RFIC, the first FEM circuit, and the like) on the first radio frequency path, the first communication module may directly complete radio frequency calibration before leaving the factory, and this part of the content may refer to a radio frequency calibration manner of a communication module in the prior art, and will not be described again.

In addition, fig. 3 is a schematic diagram illustrating a second communication module as an example. It is to be understood that the number of the second communication modules may be determined according to the fact that the communication function of the terminal is split among several communication modules. Taking the terminal as the aforementioned vehicle-mounted terminal shown in fig. 2 as an example, the communication function of the vehicle-mounted terminal can be split into 3 communication modules. 1 first communication module (i.e., primary module), and 2 second communication modules (i.e., secondary modules). For example, the first communication module is used for realizing the communication function of a communication system except for a C-V2X communication system in a multi-mode multi-frequency communication system, one second communication module realizes the communication function of a C-V2X communication system, and the other second communication module realizes the communication function of a communication system except for a C-V2X communication system in the multi-mode multi-frequency communication system, so as to realize the communication function of DSDA together with the first communication module.

It should be noted that, when the communication function of the terminal is split into a plurality of second communication modules, a calibration circuit corresponding to each second communication module needs to be arranged on the first communication module serving as the main module, so as to calibrate the radio frequency parameters of the second communication module. Accordingly, the RFIC section is not limited to a case where one second RFIC may be shared by the plurality of second communication modules, or at least two RFICs may be provided according to actual circumstances.

Optionally, PMICs for supplying power may be respectively disposed on the first communication module and the second communication module. Alternatively, a PMIC is provided only on the first communication module, which not only supplies power to the circuitry on the first communication module, but also needs to supply power to the circuitry on the second communication module. For example, to power the FEM circuitry on the second communication module. Fig. 3 is a schematic diagram illustrating an example in which only the PMIC is provided in the first communication module, and the schematic diagram illustrates only the connection of the PMIC with the BB circuit and the memory circuit. However, as will be appreciated by those skilled in the art, in this example, the PMIC requires a connection to circuitry on each of the first and second communication modules that requires power. For example, the PMIC is connected to each circuit to be powered through a power supply port of each circuit to be powered on the first communication module and the second communication module, and provides the required voltage for the circuit to be powered. Through the mode, the size of the second communication module can be further reduced, so that the area sum of the communication modules on the terminal can be reduced, the size of the bottom plate for bearing the communication modules on the terminal can be reduced, and the size of the terminal is reduced.

Optionally, the first communication module further includes: and the storage circuit is connected with the read-write end of the BB circuit and is used for providing a storage function.

The following describes how to correct the rf parameters of the second rf path corresponding to the sub-module.

First, reference signal calibration

The calibration of the reference signal may be performed when the first communication module is not already provided on the backplane of the terminal. That is, when the terminal has not been assembled using the first communication module, calibration of the reference signal can be performed. Wherein the reference signal calibration comprises: a reference signal calibration and an MRX reference signal calibration are received. The implementation may be, for example, as follows:

1. receive reference signal calibration

In calibrating the received reference signal, the BB circuitry may control the RX _ CAL transmit of the second RFIC to communicate with the receive of the calibration circuitry. At the same time, the tester will connect the measurement device to the first transceiving end of the calibration circuit.

The BB circuit is specifically configured to control the second RFIC to send a reception reference signal of preset transmission power to the calibration circuit according to a reception frequency of the second RFIC. At this time, the measurement device may measure, at the first transceiving end of the calibration circuit, the received power of the received reference signal transmitted by the second RFIC, that is, may obtain the first mapping relationship between the received power and the transmitted power of the received reference signal of the second RFIC. The first mapping relationship may be input to the BB circuit by a tester and stored in the memory circuit by the BB circuit. Alternatively, the first mapping relationship may be directly input to the memory circuit by a tester for storage, and the subsequent BB circuit may obtain the first mapping relationship from the memory circuit.

It should be understood that, when calibrating the received reference signal, it is necessary to obtain a first mapping relationship corresponding to each frequency point that needs to be used by the second communication module corresponding to the second RFIC when implementing the communication function. That is to say, the second communication module needs to use several frequency points, and then obtains the first mapping relationship corresponding to the several frequency points.

2. MRX reference signal calibration

When the MRX reference signal is calibrated, a signal source capable of transmitting a signal needs to be externally connected. The signal source may be connected to the first transceiving end of the calibration circuit, and the BB circuit may control the MRX end of the second RFIC and the transmitting end of the calibration circuit to communicate with each other.

The signal source may transmit, through the calibration circuit, an MRX reference signal to a second RFIC according to a preset reception power of the MRX reference signal of the second RFIC. The second RFIC may obtain a received power of the received MRX reference signal after receiving the MRX reference signal.

The BB circuit is specifically configured to obtain a second mapping relationship between the transmission power and the reception power of the power measurement reference signal of the second rf integrated circuit. The second mapping relationship may be input to the BB circuit by a tester and stored in the memory circuit by the BB circuit. Alternatively, the second mapping relationship may be directly input to the memory circuit by a tester for storage, and the subsequent BB circuit may obtain the second mapping relationship from the memory circuit.

It should be understood that, when calibrating the received reference signal, it is necessary to obtain a second mapping relationship corresponding to each frequency point that needs to be used by the second communication module corresponding to the second RFIC when implementing the communication function. That is to say, the second communication module needs to use several frequency points, and then the second mapping relationship corresponding to the several frequency points is obtained.

A second part: power parameter calibration

After the first communication module and the second communication module are installed on the bottom plate of the terminal, that is, after the terminal is assembled by using the first communication module and the second communication module, after the terminal is powered on, the power parameter calibration of the second communication module can be performed. The power parameter calibration comprises the following steps: the method comprises the steps of receiving power parameter calibration and transmitting power parameter calibration. The implementation may be, for example, as follows:

1. receive power parameter calibration

In calibrating the receive power parameter, the BB circuitry may control the RX _ CAL transmit of the second RFIC to communicate with the receive of the calibration circuitry. At this time, the BB circuit may control the second RFIC to transmit a calibrated reception reference signal corresponding to a preset transmission power to the second FEM circuit through the calibration circuit according to the first mapping relationship. The second RFIC detects a received power of the calibrated received reference signal returned by the second FEM circuit. The BB circuit may obtain a third mapping relationship between the transmission power and the reception power of the calibrated received reference signal. The third mapping relationship may be stored in the memory circuit by the BB circuit.

It should be understood that, when calibrating the received power parameter, the received power parameter of each frequency point needs to be calibrated at each frequency point that the second communication module corresponding to the second RFIC needs to use when implementing the communication function.

2. Transmit power parameter calibration

When the transmission power parameter is calibrated, the BB circuit may control the MRX terminal of the second RFIC and the transmitting terminal of the calibration circuit to communicate. At this time, the BB circuit may control the second RFIC to transmit a calibrated MRX reference signal corresponding to a preset transmission power to the second FEM circuit according to the second mapping relationship. The second RFIC may detect a received power of the calibrated MRX reference signal returned by the second FEM circuit through the calibration circuit. The BB circuit is specifically configured to obtain a fourth mapping relationship between the transmission power and the reception power of the calibrated MRX reference signal. The fourth mapping relationship may be stored in the memory circuit by the BB circuit.

It should be understood that, when calibrating the received power parameter, it is necessary to calibrate the received power parameter and the transmission power parameter of each frequency point, which is required to be used by the second communication module corresponding to the second RFIC when implementing the communication function. The method for calibrating the received power parameter and the transmit power parameter of each frequency point may refer to the above calibration of the transmit power parameter and the calibration of the receive power parameter, which is not described herein again.

By the method, radio frequency calibration of the second radio frequency channel corresponding to the second communication module can be completed, and when the subsequent terminal performs communication, the actually required power can be obtained according to the mapping relation to perform signal processing, so that the power of the signal transmitted through the second radio frequency channel can meet the communication requirement when the terminal performs communication through the secondary module. In addition, the radio frequency calibration work is split into two parts, one part is completed before the first communication module is installed on the bottom plate of the terminal, namely, the radio frequency calibration work is completed on a production line for producing the first communication module, the other part of the radio frequency calibration work is performed after the first communication module and the second communication module are both installed on the bottom plate of the terminal, and the terminal is assembled, so that the radio frequency calibration time on the production line can be shortened.

It should be understood that the above-mentioned radio frequency calibration of the second communication module includes, but is not limited to, the above-mentioned calibration contents, and may also involve calibration of other radio frequency parameters. Calibration with respect to other rf parameters can be implemented along the calibration method listed in the above embodiments. For example, a part of the calibration work is completed before the first communication module is installed on the bottom plate of the terminal, and another part of the calibration work is completed after the first communication module and the second communication module are both installed on the bottom plate of the terminal.

The calibration circuit involved in the first communication module may be an existing circuit having a calibration function. Fig. 4 is a schematic diagram of a calibration circuit according to an embodiment of the present disclosure. As shown in fig. 4, optionally, in some embodiments, the calibration circuit may include: a first switch S1 and a coupler. A first terminal a of the first switch S1 is connected to the first terminal M of the coupler, a second terminal D of the first switch S1 is grounded, a third terminal C of the first switch S1 is a receiving terminal of the calibration circuit, and a fourth terminal B of the first switch S1 is a second transceiving terminal of the calibration circuit. The second end N of the coupler is the first transceiving end of the calibration circuit, the third end X of the coupler is grounded, and the fourth end Y of the coupler is the transmitting end of the calibration circuit. Optionally, the second terminal D of the first switch S1 may be grounded through a resistor R1, and/or the third terminal X of the coupler may be grounded through a resistor R2. Through resistance ground connection, can realize the circuit matching, avoid the unsettled condition of pin to appear. The sizes of the R1 and the R2 can be set according to actual requirements.

The first RFIC involved in the first communication module may be any existing circuit having a radio frequency function, and the second RFIC may be any existing circuit having a radio frequency function and transmitting and receiving a reference signal. Fig. 5 is a schematic structural diagram of an RFIC according to an embodiment of the present application. As shown in fig. 5, optionally, as a possible implementation manner, the second RFIC includes: a transmitting unit, a mixer, an amplifier, a second switch S2. The transmitting unit is connected to the first end E of the second switch S2 sequentially through the mixer and the amplifier, the second end F of the second switch S2 is an RX _ CAL transmitting end of the second RFIC, and the third end G of the second switch S2 is a second transmitting end of the second RFIC. Wherein the transmitting unit is configured to provide a receiving reference signal when a path between the first terminal E of the second switch S2 and the second terminal F of the second switch S2 is turned on.

Optionally, the second RFIC may further include: and an MRX unit for receiving the MRX reference signal and detecting a received power of the received MRX reference signal. In this example, the receiving end of the MRX unit is the MRX end of the second RFIC.

Optionally, the second RFIC may further include: and the receiving unit is used for receiving and processing the radio frequency signal received on the second radio frequency path. In this example, the receiving end of the receiving unit is a second receiving end of a second RFIC.

The following describes a terminal provided in an embodiment of the present application with a specific example.

Fig. 6 is a schematic structural diagram of another terminal provided in the embodiment of the present application. As shown in fig. 6, the terminal is an in-vehicle terminal, and the communication function of the in-vehicle terminal includes: communication function of multimode multi-frequency communication system, communication function of DSDA. In this example, the communication function of the in-vehicle terminal is split into 3 communication modules, namely a communication module a, a communication module B and a communication module C.

The communication module A is a main module and comprises: BB circuit, RFIC0, FEM0 circuit, RFIC1, calibration circuit 1, calibration circuit 2, PMIC circuit, and memory circuit. The connection relationship of each circuit can be referred to the description of the foregoing embodiments, and is not described herein again. The BB circuit, the RFIC0 circuit, the FEM0 circuit and the antenna 0 of the vehicle-mounted terminal of the communication module A form a radio frequency path (referred to as a radio frequency path 1 for short) for realizing the communication function of the communication system except the C-V2X communication system in the multi-mode multi-frequency communication system. For example, at least two communication systems are as follows: 2G communication system, 3G communication system, 4G communication system, 5G communication system and the like.

As a possible implementation manner, the functions of the BB circuit may be implemented by a BB chip, the RFIC0 and the RFIC1 may be RFICs shown in fig. 5, and the functions of the RFIC0 and the RFIC1 may be implemented by an RFIC chip, for example. The calibration circuit 1 and the calibration circuit 2 may be as shown in fig. 4, and the functions of the calibration circuit 1 and the calibration circuit 2 may be realized by a calibration chip, for example. The function of the PMIC circuit may be realized by a PMIC chip, for example, and the function of the memory circuit may be realized by a ROM, for example. The FEM0 circuit may include, for example: for radio frequency front end devices such as a Power Amplifier (PA), a Low Noise Amplifier (LNA), a duplexer/filter, and an antenna switch, the connection relationship of each device may refer to the prior art, and is not described herein again. The function of the FEM0 circuit may be implemented by a FEM chip, for example.

The communication module B is a sub-module and comprises an FEM1 circuit. The BB circuit, the RFIC1 circuit, the calibration circuit 1, the FEM1 circuit of the communication module A and the antenna 1 of the vehicle-mounted terminal form a radio frequency path (radio frequency path 2 for short) for realizing the communication function of the communication system except the C-V2X communication system in the multi-mode multi-frequency communication system. The FEM1 circuit may include, for example: the connection relationship of the rf front-end devices such as the PA, the LNA, the duplexer/filter, and the antenna switch can be referred to the prior art, and is not described herein again. The function of the FEM1 circuit may be implemented by a FEM chip, for example.

The communication module C is a sub-module including the FEM2 circuit. The BB circuit of the communication module A, the RFIC1 circuit, the calibration circuit 2, the FEM2 circuit and the antenna 2 of the vehicle-mounted terminal form a radio frequency path (radio frequency path 3 for short) for realizing the communication function of the C-V2X communication system. The FEM2 circuit may include, for example: the connection relationship of the rf front-end devices such as the PA, the LNA, the filter, the antenna switch, etc. can be referred to the prior art, and is not described herein again. The function of the FEM2 circuit may be implemented by a FEM chip, for example.

The PMIC of the communication module a needs to supply power to the FEM1 circuit and the FEM2 circuit in addition to the BB circuit, the RFIC0, the FEM0 circuit, the RFIC1, the calibration circuit 1, the calibration circuit 2, and the memory circuit.

When the communication module B and/or the communication module C as the sub-module can be mounted on the chassis of the in-vehicle terminal before the communication module a as the main module is mounted on the chassis according to the user's requirement, the communication module a as the main module can control the communication module B and/or the communication module C as the sub-module to provide a communication function and control the communication module B and/or the communication module C as the sub-module to complete radio frequency calibration so that the communication module B and/or the communication module C meet the communication requirement. Fig. 6 is a schematic diagram illustrating an example in which a communication module a, a communication module B, and a communication module C are mounted on a chassis of the in-vehicle terminal. It should be understood that, for the purpose of making the drawings intuitive and concise, fig. 6 simply shows the connection manner of the communication module a and the communication module B, the connection manner of the communication module a and the communication module C, the specific connection manner of the communication module a and the communication module B, and the specific connection manner of the communication module a and the communication module C may refer to the connection manner of the first communication module and the second communication module described above, and will not be described again here. Optionally, the connection between the communication module a and the communication module B, and the connection between the communication module a and the communication module C may be implemented by a wire running on a bottom plate of the vehicle-mounted terminal. For example, the power terminals, the control terminals, and the rf terminals (i.e., ports for sending and receiving rf signals) of the main module and the sub-module are wired on the backplane.

The communication module a may be configured to perform the rf calibration of the rf path 1, the calibration of the MRX reference signal required by the sub-module, and the calibration of the reception reference signal before the communication module a is mounted on the backplane of the in-vehicle terminal, for example, before the communication module a is shipped from a factory.

The following describes how to calibrate the MRX reference signal and calibrate the received reference signal required by the communication module B, taking the communication module a and the communication module B as an example.

A reception reference signal calibration section:

fig. 7 is a schematic diagram of a calibration of a received reference signal according to an embodiment of the present disclosure. As shown in fig. 7, a calibration circuit 1 and a test point TP (i.e., the first transceiving end of the calibration circuit 1) are added to a communication module a as a main module, and the description of the calibration circuit 1 can refer to the description of fig. 4. The RFIC1 circuitry on communications module a may be described with reference to the description of fig. 5 above.

In calibrating the received reference signal, the BB circuit of the communication module a may control the E terminal of the switch S2 of the RFIC1 to communicate with the F terminal, and control the a terminal of the switch S1 of the calibration circuit 1 to communicate with the C terminal. At the same time, the tester connects the measuring device (i.e. spectrometer) to the test point TP, forming a path shown by a dashed line in fig. 7.

Taking the working frequency point B1 as an example, a tester may configure a control word corresponding to each receiving frequency of B1 in the BB circuit, so that the BB circuit may control the transmitting unit of the RFIC1 to transmit a receiving reference signal of preset transmitting power to the calibration circuit 1 by transmitting the control word corresponding to each receiving frequency to the RFIC 1. The predetermined transmission power is equal to the reception power corresponding to the control word. At this time, the spectrometer may measure the actual received power of the received reference signal transmitted by the RFIC1 at the TP terminal, that is, may obtain the first mapping relationship between the received power and the transmitted power of the received reference signal of the RFIC 1.

For example, the BB circuit may transmit a control word APC0 to the RFIC1 to control the transmission unit of the RFIC1 to transmit the reception reference signal of the power corresponding to the APC0 to the calibration circuit 1. Accordingly, the spectrometer can measure the actual received power of the received reference signal transmitted by the RFIC1 at the TP port as P0, recorded as (APC0, P0). The reception power corresponding to the APC0 is the same as the transmission power of the reception reference signal transmitted by the transmitting unit of the RFIC1, and therefore the control word may also indicate the transmission power. Accordingly, (APC0, P0) can also be regarded as a mapping relation between the received power and the transmitted power of the received reference signal.

Then, the BB circuit may transmit the control word APC1 to the RFIC1 to control the transmission unit of the RFIC1 to transmit the reception reference signal of the power corresponding to the APC1 to the calibration circuit 1. Accordingly, the spectrometer can measure the actual received power of the received reference signal transmitted by the RFIC1 at the TP port as P1, recorded as (APC1, P1). By analogy, a first mapping relation between the received power and the transmitted power of the received reference signal of the RFIC1 can be obtained. The first mapping relationship may be, for example, as follows: { (APC0, P0), (APC1, P1) … … }. The first mapping relationship may be input to the BB circuit by a tester and stored in the memory circuit by the BB circuit. Alternatively, the first mapping relationship may be directly input to the memory circuit by a tester for storage, and the subsequent BB circuit may obtain the first mapping relationship from the memory circuit. At this point, calibration of the received reference signal is completed.

It should be understood that, when calibrating the received reference signal, it is necessary to obtain, at each frequency point that the communication module B needs to use when implementing the communication function, a first mapping relationship corresponding to the frequency point. Taking the frequency point where the communication module B needs to use the 2G communication system, the frequency point where the 3G communication system is located, the frequency point where the 4G communication system is located, and the frequency point where the 5G communication system is located as an example, in this example, the above-described manner needs to be adopted to respectively obtain the first mapping relationship corresponding to the frequency point where the 2G communication system is located, the first mapping relationship corresponding to the frequency point where the 3G communication system is located, the first mapping relationship corresponding to the frequency point where the 4G communication system is located, and the first mapping relationship corresponding to the frequency point where the 5G communication system is located.

MRX reference signal calibration section:

fig. 8 is a schematic diagram of an MRX reference signal calibration according to an embodiment of the present disclosure. As shown in fig. 8, when the MRX reference signal is calibrated, a signal source capable of transmitting a signal needs to be externally connected. The signal source may be connected to the calibration circuit 1 through the test point TP, and the BB circuit may control the a terminal and the D terminal of the switch S1 of the calibration circuit 1 to communicate. Since the D terminal is grounded through a resistor (which may be 50 ohms, for example), the signal source may form a path with the MRX unit of RFIC1 through a coupler, as shown by the dashed line in fig. 8.

The signal source may transmit the MRX reference signal to the RFIC1 through the calibration circuit 1 according to a preset reception power of the MRX reference signal of the RFIC 1. The RFIC1 may obtain the received power of the received MRX reference signal after receiving the MRX reference signal. Taking the example of MRX comprising a plurality of gears, each gear requires a different power for processing signals requiring a different gain. Then in this example, the signal source may input to the TP an MRX reference signal for the power required for each gear of MRX. The RFIC1 may obtain the received power of the MRX reference signal after receiving the MRX reference signal corresponding to the current gear.

Taking the working frequency point B1 as an example, the signal source may input the MRX reference signal of the power a0 required by MRX step 0 of the working frequency point B1 to TP. After receiving the MRX reference signal corresponding to the current gear 0, the RFIC1 may obtain the received power M0 of the received MRX reference signal, and record the received power as (DAC0, M0). The DAC0 may be a control word corresponding to power a 0. The signal source may then input to TP an MRX reference signal of power a1 required for MRX gear 1 at operating frequency B1. After receiving the MRX reference signal corresponding to the current gear 1, the RFIC1 may obtain the received power M1 of the received MRX reference signal, and record the received power as (DAC1, M1). By analogy, a second mapping relation between the transmission power and the reception power of the MRX reference signal of the RFIC1 corresponding to the working frequency point B1 can be obtained. The second mapping relationship may be, for example, as follows: { (DAC0, M0), (DAC1, M1) … … }. The second mapping may be input to the BB circuit by a tester. Alternatively, the second mapping relationship may be directly input to the memory circuit by a tester for storage, and the subsequent BB circuit may obtain the second mapping relationship from the memory circuit. At this point, the calibration of the MRX reference signal is completed. The second mapping relationship may also be stored in a table form, and when stored in a table form, the second mapping relationship may also be referred to as an MRX reference signal parameter table.

It should be understood that, when the MRX reference signal is calibrated, it is necessary to obtain, at each frequency point that the communication module B needs to use when implementing the communication function, a second mapping relationship corresponding to the frequency point. Taking the frequency point where the communication module B needs to use the 2G communication system, the frequency point where the 3G communication system is located, the frequency point where the 4G communication system is located, and the frequency point where the 5G communication system is located as an example, in this example, the above-described manner needs to be adopted to respectively obtain the second mapping relationship corresponding to the frequency point where the 2G communication system is located, the second mapping relationship corresponding to the frequency point where the 3G communication system is located, the second mapping relationship corresponding to the frequency point where the 4G communication system is located, and the second mapping relationship corresponding to the frequency point where the 5G communication system is located.

After the calibration of the receiving reference signal and the calibration of the MRX reference signal are completed, and the communication module a as the main module and the communication module B as the sub module are subsequently mounted on the bottom board of the in-vehicle terminal, and after the in-vehicle terminal is assembled and powered on, the BB circuit of the communication module a as the main module may control the sub module to complete the calibration of the receiving power parameter and the calibration of the transmitting power parameter, which may be implemented as follows:

a reception power parameter calibration section:

fig. 9 is a schematic diagram of a calibration of a received power parameter according to an embodiment of the present disclosure. As shown in fig. 9, when calibrating the received power parameter, the BB circuit of the communication module a may control the terminal E of the switch S2 of the RFIC1 to communicate with the terminal F, and control the terminal a of the switch S1 of the calibration circuit 1 to communicate with the terminal C, forming a path shown by a dotted line in fig. 9.

The BB circuit may control the RFIC1 to transmit a calibrated reception reference signal corresponding to a preset transmission power to the FEM1 circuit through the calibration circuit 1 according to the first mapping relationship. The RFIC1 detects the receive power of the calibrated receive reference signal returned by the FEM1 circuit. The BB circuit may thereby obtain a third mapping relationship between the transmission power and the reception power of the calibrated received reference signal.

Taking the first mapping relationship corresponding to the operating frequency point B1 as { (APC0, P0), (APC1, P1) … … } as an example, in this example, the BB circuit may control the transmitting unit of the RFIC1 to transmit the calibrated received reference signal with power of P0 to the FEM1 circuit through the calibration circuit 1 according to the first mapping relationship. The receiving unit of the RFIC1 may detect the receive power RSSI0 of the calibrated received reference signal returned by the FEM1 circuit, recorded as (APC0, RSSI0, P0). According to the same method, a mapping relation between each transmission power and the reception power of the calibrated received reference signal may be obtained, so as to obtain a third mapping relation. The third mapping relationship may be, for example, { (APC0, RSSI0, P0), (APC1, RSSI1, P1) … … } as follows. The third mapping may be stored by the BB circuit into a memory circuit. At this point, the calibration of the received power parameter is completed.

It should be understood that, when calibrating the received power parameter, it is necessary to obtain, at each frequency point that the communication module B needs to use when implementing the communication function, a third mapping relationship corresponding to the frequency point. Taking the frequency point where the communication module B needs to use the 2G communication system, the frequency point where the 3G communication system is located, the frequency point where the 4G communication system is located, and the frequency point where the 5G communication system is located as an example, in this example, the above-described manner needs to be adopted to respectively obtain the third mapping relationship corresponding to the frequency point where the 2G communication system is located, the third mapping relationship corresponding to the frequency point where the 3G communication system is located, the third mapping relationship corresponding to the frequency point where the 4G communication system is located, and the third mapping relationship corresponding to the frequency point where the 5G communication system is located.

A transmission power parameter calibration section:

fig. 10 is a schematic diagram of a transmit power parameter calibration according to an embodiment of the present application. As shown in fig. 10, when calibrating the transmission power parameter, the BB circuit of the communication module a may control the terminal E of the switch S2 of the RFIC1 to communicate with the terminal G, and control the terminal a of the switch S1 of the calibration circuit 1 to communicate with the terminal D, forming a path shown by a dotted line in fig. 10.

The BB circuit may control the RFIC1 to transmit a calibrated MRX reference signal corresponding to a preset transmission power to the FEM1 circuit according to the second mapping relationship. The RFIC1 may detect the received power of the calibrated MRX reference signal returned by the FEM1 circuit through the calibration circuit 1. The BB circuit is specifically configured to obtain a fourth mapping relationship between the transmission power and the reception power of the calibrated MRX reference signal.

Taking the second mapping relationship corresponding to the operating frequency point B1 as an example, the BB circuit may send the control word DAC0 to the RFIC1 to control the transmitting unit of the RFIC1 to send the calibrated MRX reference signal of the power corresponding to the DAC0 to the calibration circuit 1, where the signal is output from the transmitting end of the RFIC1 to the PA, duplexer, etc. of the communication module B, and returns to the MRX end of the RFIC1 through the coupler of the calibration circuit 1, and the MRX unit of the RFIC1 reads the power MR0 of the MRX reference signal. Through the second mapping relation corresponding to the working frequency point B1, the actual transmission power value M0 corresponding to the DAC0 may be obtained and recorded as (DAC0, MR0, M0). And traversing all the control words in the second mapping relation according to the same method to obtain a fourth mapping relation. The fourth mapping relationship may be, for example, as follows: { (DAC0, MR0, M0), (DAC1, MR0, M1) … … }. The fourth mapping may be stored by the BB circuit into a memory circuit. At this point, the calibration of the transmit power parameter is completed.

After the first to fourth mapping relationships are obtained, when the subsequent terminal performs communication at the frequency point, the actually required power may be obtained according to the mapping relationships to perform signal processing, so as to ensure that the power of the signal transmitted through the second radio frequency channel meets the communication requirement when the terminal performs communication through the communication function provided by the communication module B.

It should be understood that, when the transmit power parameter is calibrated, it is necessary to obtain, at each frequency point that the communication module B needs to use when implementing the communication function, a fourth mapping relationship corresponding to the frequency point. Taking the frequency point where the communication module B needs to use the 2G communication system, the frequency point where the 3G communication system is located, the frequency point where the 4G communication system is located, and the frequency point where the 5G communication system is located as an example, in this example, the above-described manner needs to be adopted to respectively obtain the fourth mapping relationship corresponding to the frequency point where the 2G communication system is located, the fourth mapping relationship corresponding to the frequency point where the 3G communication system is located, the fourth mapping relationship corresponding to the frequency point where the 4G communication system is located, and the fourth mapping relationship corresponding to the frequency point where the 5G communication system is located.

It should be understood that the above radio frequency calibration of the communication module B includes, but is not limited to, the above illustrated calibration contents, and may also involve calibration of other radio frequency parameters. Calibration with respect to other rf parameters can be implemented along the calibration method listed in the above embodiments. For example, a part of the calibration work is completed before the communication module a is mounted on the bottom plate of the in-vehicle terminal, that is, a production line for producing the communication module a is completed, and another part of the calibration work is completed after the communication module a and the communication module B are mounted on the bottom plate of the in-vehicle terminal and the terminal is assembled, which are similar to each other in implementation principle and will not be described again.

It should be understood that, when the vehicle-mounted terminal is installed with the communication module C, the communication module a may calibrate the radio frequency of the communication module C in the above-described manner of calibrating the communication module B, which is similar to the above-described implementation manner and is not described herein again. And finishing the radio frequency calibration of all communication modules on the vehicle-mounted terminal. And then, after the vehicle-mounted terminal is restarted, the communication function is realized.

The terminal provided by the embodiment of the application can split the communication function of the terminal to a plurality of communication modules. And 1 of the communication modules is a main module, and the rest of the communication modules are auxiliary modules. The communication module as the main module is provided with BB circuits and RFICs corresponding to the sub-modules, and the communication module as the sub-module does not need to be provided with these circuits. Therefore, when the terminal simultaneously comprises the secondary module and the main module, the FEM circuit arranged on the secondary module, the BB circuit arranged on the main module and the RFIC arranged on the main module form a radio frequency channel, so that the communication function of the secondary module is realized, the BB circuit and the RFIC do not need to be separately arranged on the secondary module, the cost of the terminal is reduced, the size of a single communication module is also reduced, and the communication module can meet the requirements of a mounting process. In addition, because the communication functions supported by the plurality of communication modules are different, the communication modules of the terminal can be flexibly set according to the requirements of the user on the communication functions, so that the configuration flexibility of the communication modules is improved, the cost of the terminal is further reduced, and the user experience is also improved.

The embodiment of the present application further provides a communication module, which has the structure of the first communication module of the terminal, and can implement the method for implementing the radio frequency calibration implemented by the first communication module, which is not described herein again.

The embodiment of the present application further provides a radio frequency calibration method, which can be applied to the first communication module of the terminal or the BB circuit in the first communication module, so that the first communication module can implement the calibration of the radio frequency of the secondary module, and the implementation manner thereof is similar to the manner described above, and is not described again.

The term "plurality" herein means two or more. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship; in the formula, the character "/" indicates that the preceding and following related objects are in a relationship of "division".

It is to be understood that the various numerical references referred to in the embodiments of the present application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of the present application.

It should be understood that, in the embodiment of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiment of the present application.

Claims

1. A terminal, characterized in that the terminal comprises: a first communication module and a first antenna; wherein the first communication module comprises: the radio frequency calibration circuit comprises a baseband circuit, a first radio frequency integrated circuit, a first radio frequency front end module circuit, a second radio frequency integrated circuit and a calibration circuit;

a first receiving end of the baseband circuit is connected with a first sending end of the first radio frequency integrated circuit, a first sending end of the baseband circuit is connected with a first receiving end of the first radio frequency integrated circuit, a second receiving end of the first radio frequency integrated circuit is connected with a sending end of the first radio frequency front end module circuit, a second sending end of the first radio frequency integrated circuit is connected with a receiving end of the first radio frequency front end module circuit, and a common end of the first radio frequency front end module circuit is connected with the first antenna;

a second receiving end of the baseband circuit is connected with a first transmitting end of the second radio frequency integrated circuit, and a second transmitting end of the baseband circuit is connected with a first receiving end of the second radio frequency integrated circuit;

a first control end of the baseband circuit is connected with a control end of the second radio frequency integrated circuit, a second control end of the baseband circuit is connected with a control end of the calibration circuit, a reference signal receiving sending end of the second radio frequency integrated circuit is connected with a receiving end of the calibration circuit, and a power measuring end of the second radio frequency integrated circuit is connected with a sending end of the calibration circuit;

the baseband circuit is used for calibrating the receiving reference signal and the power measurement reference signal of the second radio frequency integrated circuit through the calibration circuit;

wherein, the terminal further includes: a second communication module and a second antenna; wherein the second communication module comprises: a second radio frequency front end module circuit;

a second receiving end of the second radio frequency integrated circuit is connected with a sending end of the second radio frequency front end module circuit, a second sending end of the second radio frequency integrated circuit is connected with a receiving end of the second radio frequency front end module circuit, a common end of the second radio frequency front end module circuit is connected with a first transceiving end of the calibration circuit, and a second transceiving end of the calibration circuit is connected with the second antenna;

the baseband circuit is further configured to calibrate the transmit power parameter and the receive power parameter of the second rf integrated circuit through the calibration circuit.

2. The terminal of claim 1, wherein:

the baseband circuit is specifically configured to control the second rf integrated circuit to send a receiving reference signal with a preset sending power to the calibration circuit according to the receiving frequency of the second rf integrated circuit, and obtain a first mapping relationship between the receiving power and the sending power of the receiving reference signal of the second rf integrated circuit.

3. The terminal of claim 2, wherein:

the baseband circuit is specifically configured to control the second rf integrated circuit to send, according to the first mapping relationship, a calibrated receive reference signal corresponding to the preset sending power to the second rf front-end module circuit through the calibration circuit;

the second rf integrated circuit is specifically configured to detect the receiving power of the calibrated receiving reference signal returned by the second rf front-end module circuit;

the baseband circuit is specifically configured to obtain a third mapping relationship between the transmission power and the reception power of the calibrated reception reference signal.

4. The terminal of claim 3, wherein a signal source is connected to the first transceiving terminal of the calibration circuit;

the signal source is used for sending a power measurement reference signal to a second radio frequency integrated circuit through the calibration circuit according to the preset receiving power of the power measurement reference signal of the second radio frequency integrated circuit;

the second radio frequency integrated circuit is used for receiving the power measurement reference signal and acquiring the received power of the received power measurement reference signal;

the baseband circuit is specifically configured to obtain a second mapping relationship between the transmission power and the reception power of the power measurement reference signal of the second radio frequency integrated circuit.

5. The terminal of claim 4, wherein:

the baseband circuit is specifically configured to control the second radio frequency integrated circuit to send a calibrated power measurement reference signal corresponding to the preset received power to the second radio frequency front-end module circuit according to the second mapping relationship;

the second rf integrated circuit is specifically configured to detect a received power of the calibrated power measurement reference signal returned by the second rf front-end module circuit through the calibration circuit;

the baseband circuit is specifically configured to obtain a fourth mapping relationship between the transmission power and the reception power of the calibrated power measurement reference signal.

6. The terminal of claim 5, wherein the calibration circuit comprises: a first switch and a coupler;

a first end of the first switch is connected to a first end of the coupler, a second end of the first switch is grounded, a third end of the first switch is a receiving end of the calibration circuit, and a fourth end of the first switch is a second transceiving end of the calibration circuit;

the second end of the coupler is the first transceiving end of the calibration circuit, the third end of the coupler is grounded, and the fourth end of the coupler is the transmitting end of the calibration circuit.

7. The terminal of claim 6, wherein the second radio frequency integrated circuit comprises: the device comprises a sending unit, a mixer, an amplifier and a second switch;

the transmitting unit is connected with a first end of the second switch sequentially through the frequency mixer and the amplifier, a second end of the second switch is a reference signal receiving transmitting end of the second radio frequency integrated circuit, and a third end of the second switch is a second transmitting end of the second radio frequency integrated circuit;

the transmitting unit is configured to provide a receiving reference signal when a path between the first end of the second switch and the second end of the second switch is turned on.

8. The terminal of any of claims 1-7, wherein the first communication module further comprises: a power management integrated circuit;

the power management integrated circuit is used for supplying power to the first communication module and the second communication module.

9. A terminal according to any of claims 1 to 7, wherein there are a plurality of said calibration circuits and a plurality of said second communication modules, one for each of said calibration circuits.

10. The terminal of any of claims 1-7, wherein the first communication module further comprises: a storage circuit;

the storage circuit is connected with the read-write end of the baseband circuit.