COMMUNICATION METHOD, COMMUNICATION DEVICE, AND COMMUNICATION SYSTEM

Abstract

[0009] Embodiments of the present application provide a communication method, a communication device, and a communication system. The communication method applied to a first device includes the steps of: transmitting a first signal to a second device, where the transmitted first signal has a first phase; and receiving a second signal from the second device, where the second signal and the first signal are two signals whose transmission directions are opposite to each other on a first transmission path, and the received second signal has a second phase, and the first and second phases are used to adjust a data signal on the first transmission path. Based on this technical solution, the phase difference between the first and second phases indicates the effect of two bidirectional transmissions on the phase of the first transmission path, and the first and second phases can be used to adjust the data signal to improve the reliability of data signal transmission on the first transmission path.

Description

[Technical Field]

[0001] TECHNICAL FIELD Embodiments of the present application relate to the field of communications, and more particularly to a communication method, a communication device, and a communication system. [Background technology]

[0002] With the development of communication technology, in order to improve the coverage capability of a network, a baseband unit (BU) and a radio unit (RU) may be located in different geographical locations to jointly provide services to users. However, due to the environmental influence on the transmission path between the RU and the BU, there may be a phase difference in the phase of the data signal transmitted between the RU and the BU. The phase difference may cause the receiving end of the data signal to be unable to correctly analyze the data signal.

[0003] Therefore, there is an urgent need for communication methods, baseband units, and radio units to improve the reliability of data transmission. Summary of the Invention [Means for solving the problem]

[0004] SUMMARY OF THE INVENTION The embodiments of the present application provide a communication method, a communication device, and a communication system to improve the reliability of data transmission.

[0005] According to a first aspect, there is provided a communication method, which can be performed by a first device or a chip in the first device, and includes the steps of: transmitting a first signal to a second device, the first signal having a first phase; and receiving a second signal from the second device, the second signal and the first signal being two signals having opposite transmission directions on a first transmission path, the received second signal having a second phase, and the first and second phases being used to adjust a data signal on the first transmission path.

[0006] Based on this technical solution, the phase of a first signal transmitted by a first device on a first transmission path is a first phase, and the phase of a second signal received on the first transmission path is a second phase. The second signal is generated by a second device based on the first signal, and the phase difference between the first phase and the second phase indicates the influence of the two bidirectional transmissions on the phase of the first transmission path, so that the first phase and the second phase can be used to adjust the data signal on the first transmission path, thereby improving the reliability of data signal transmission on the first transmission path.

[0007] In addition, the first signal and the second signal may be any signal transmitted and received between the first device and the second device. In a case where the first device and the second device handle data services, the first signal and the second signal may be data service signals that can be transmitted between the second device and the first device. In a case where the first device and the second device do not handle data services, the first signal and the second signal may be signals used for communication negotiation between the first device and the second device. In other words, in this embodiment, the phase can be measured using signals transmitted between the first device and the second device, and dedicated transmission resources do not need to be allocated to the first signal and the second signal for phase measurement. This can support frequent signal measurement, reduce the impact on service data transmission, and save consumption of transmission resources.

[0008] In relation to the first aspect, in some implementations of the first aspect, the method further includes a step of transmitting phase information to a second device, where the phase information is determined based on the first phase and the second phase, and the phase information is used to adjust the data signal.

[0009] Based on this technical solution, the second device and the first device have different design divisions of operations, so that, for example, in the ecpri transmission protocol, some baseband processing may be performed by the second device or the first device. In a scenario where the data signal is adjusted to be more suitable for execution by the second device, the first device may send phase information to the second device, so that this solution supports a flexible way of adjusting the data signal.

[0010] In relation to the first aspect, in some implementations of the first aspect, the phase information indicates a measured phase difference, and the measured phase difference is determined based on the first phase and the second phase, or the phase information indicates a variable phase difference, and the variable phase difference is determined based on the measured phase difference and a reference phase difference.

[0011] Based on this technical solution, when the phase information indicates a measured phase difference, the measured phase difference can be used to adjust the data signal of the first transmission path, thereby compensating for the influence of the first transmission path on the data signal transmitted between the first device and the second device, in order to improve the reliability of the data signal transmission.

[0012] When the phase information indicates a variable phase difference, the measured phase difference may not affect the analysis of the data signal. For example, the receiving end of the data signal may preconfigure a reference phase difference or may be informed of the reference phase difference and analyze the data signal based on the reference phase difference. If the difference between the measured phase difference and the reference phase difference is less than a certain threshold, the first device or the second device may no longer perform phase compensation on the data signal of the first transmission path based on the measured phase difference. If the difference between the measured phase difference and the reference phase difference is equal to or greater than a certain threshold, the first device may perform phase compensation on the data signal of the first transmission path based on the difference between the reference phase difference and the measured phase difference. Therefore, because the transmission distance of the transmission path usually does not change and other environmental factors such as temperature usually change slowly, it can be assumed that the effect of the transmission path on the phase of the data signal does not change or changes slightly over a certain period of time. Therefore, after the first device obtains the measured phase difference through measurement, the first device may compare the measured phase difference with the reference phase difference and adjust the data signal of the first transmission path based on the variable phase difference between the measured phase difference and the reference phase difference. Thus, the number or extent of compensation performed on the data signal can be reduced to improve the efficiency of the data signal transmission while improving the reliability of the data signal transmission.

[0013] In relation to the first aspect, in some implementations of the first aspect, the reference phase difference is a reference phase difference for signal transmission on a first transmission path, or the reference phase difference is a reference phase difference for signal transmission on a second transmission path, and the second transmission path is a transmission path different from the first transmission path.

[0014] Based on this technical solution, when the reference phase difference is a reference phase difference for signal transmission on a first transmission path, phase compensation is performed based on a variable phase difference obtained using the reference phase difference, thereby maintaining the influence of the first transmission path on the phase of the data signal at a constant level and improving the reliability of data signal transmission on the first transmission path.When the reference phase difference is a reference phase difference for signal transmission on a second transmission path, phase compensation is performed on the data signal of the first transmission path based on a variable phase difference obtained based on the reference phase difference, thereby matching the influences of the two transmission paths on the phase of the data signal and improving the reliability of coordination of multiple transmission paths.

[0015] In relation to the first aspect, in some implementations of the first aspect, the phase information indicates a corresponding value obtained by transforming a measured phase difference into at least one frequency point, or the phase information indicates a corresponding value obtained by transforming a varying phase difference into at least one frequency point.

[0016] Optionally, the information corresponding to each of the at least one frequency point indicates an amount of phase adjustment at the frequency point.

[0017] Based on this technical solution, the first device can convert the acquired measured phase difference or variable phase difference into at least one frequency point, thereby reducing the processing complexity of adjusting the data signal by the second device.

[0018] In relation to the first aspect, in some implementations of the first aspect, the data signal is adjusted based on the first phase and the second phase.

[0019] For example, the first device adjusts the data signal on the first transmission path based on the measured or varying phase difference.

[0020] In relation to the first aspect, in some implementations of the first aspect, adjusting the data signal based on the first phase and the second phase includes adjusting frequency domain information corresponding to the data signal based on the first phase and the second phase, adjusting time domain information corresponding to the data signal based on the first phase and the second phase, or adjusting clock information based on the first phase and the second phase, where the clock information is used to transmit the data signal.

[0021] Based on this technical solution, the first device may support multiple ways of conditioning data signals so that various application scenarios can be supported.

[0022] In relation to the first aspect, in some implementations of the first aspect, the step of transmitting the phase information to the second device includes a step of transmitting the phase information to the second device via a first interface, where the first interface is one of the following interfaces: a Common Public Radio Interface (CPRI) or an enhanced Common Public Radio Interface (eCPRI).

[0023] According to a second aspect, there is provided a communication method, which can be performed by a second device or a chip in the second device, including the steps of receiving a first signal from a first device and transmitting a second signal to the first device, the second signal and the first signal being two signals having opposite transmission directions on a first transmission path, the phase of the transmitted second signal being determined based on the phase of the received first signal, and the first signal and the second signal being used to adjust a data signal on the first transmission path.

[0024] Based on this technical solution, the phase of a first signal transmitted by a first device on a first transmission path is a first phase, and the phase of a second signal received on the first transmission path is a second phase. The second signal is generated by a second device based on the first signal, and the phase difference between the first phase and the second phase indicates the influence of the two bidirectional transmissions on the phase of the first transmission path, so that the first phase and the second phase can be used to adjust the data signal on the first transmission path, thereby improving the reliability of data signal transmission on the first transmission path.

[0025] In relation to the second aspect, in some implementations of the second aspect, the method further includes a step of receiving phase information from the first device, the phase information being determined based on the first signal and the second signal, and a step of adjusting a data signal of the first transmission path based on the phase information.

[0026] In relation to the second aspect, in some implementations of the second aspect, the phase information indicates a measured phase difference, and the measured phase difference is determined based on a first phase of a first signal transmitted by the first device and a second phase of a second signal received by the first device, or the phase information indicates a variable phase difference, and the variable phase difference is determined based on the measured phase difference and a reference phase difference.

[0027] In relation to the second aspect, in some implementations of the second aspect, the reference phase difference is a reference phase difference for signal transmission on a first transmission path, or the reference phase difference is a reference phase difference for signal transmission on a second transmission path, and the second transmission path is a transmission path different from the first transmission path.

[0028] In relation to the second aspect, in some implementations of the second aspect, the phase information indicates a corresponding value obtained by transforming a measured phase difference into at least one frequency point, or the phase information indicates a corresponding value obtained by transforming a varying phase difference into at least one frequency point.

[0029] In relation to the second aspect, in some implementations of the second aspect, the step of adjusting the data signal of the first transmission path based on the phase information includes a step of adjusting frequency domain information corresponding to the data signal based on the phase information, a step of adjusting time domain information corresponding to the data signal based on the phase information, or a step of adjusting clock information based on the phase information, wherein the clock information is used to transmit the data signal.

[0030] In relation to the second aspect, in some implementations of the second aspect, the step of receiving phase information from the first device includes a step of receiving phase information from the first device via a first interface, wherein the first interface is one of the following interfaces: Common Public Radio Interface CPRI or enhanced Common Public Radio Interface eCPRI.

[0031] The embodiment of the second aspect is a second device method corresponding to the embodiment of the first aspect. For the beneficial technical effects of the embodiment of the second aspect, please refer to the description of the related embodiment of the first aspect. The details will not be described again here.

[0032] According to a third aspect, there is provided a communication method, the method including: a first device transmitting a first signal to a second device; a phase of the first signal transmitted by the first device being a first phase; the second device transmitting a second signal to the first device; the second signal and the first signal being two signals having opposite transmission directions on a first transmission path; the phase of the second signal transmitted by the second device being determined based on the phase of the first signal received by the second device; the phase of the second signal received by the first device being a second phase; and the first phase and the second phase being used to adjust a data signal on the first transmission path.

[0033] Based on this technical solution, the phase of a first signal transmitted by a first device on a first transmission path is a first phase, and the phase of a second signal received on the first transmission path is a second phase. The second signal is generated by a second device based on the first signal, and the phase difference between the first phase and the second phase indicates the influence of the two bidirectional transmissions on the phase of the first transmission path, so that the first phase and the second phase can be used to adjust the data signal on the first transmission path, thereby improving the reliability of data signal transmission on the first transmission path.

[0034] In relation to the third aspect, in some implementations of the third aspect, a first device transmits phase information to a second device, the phase information is determined based on the first phase and the second phase, the phase information is used to adjust a data signal, and the second device adjusts the data signal of the first transmission path based on the phase information.

[0035] With respect to the third aspect, in some implementations of the third aspect, the first device adjusts the data signal based on the first phase and the second phase.

[0036] In relation to the third aspect, in some implementations of the third aspect, the first device transmitting the phase information to the second device includes the first device transmitting the phase information to the second device via a first interface, and the first interface being one of the following interfaces: Common Public Radio Interface CPRI or enhanced Common Public Radio Interface eCPRI.

[0037] The embodiment of the third aspect is a system method corresponding to the embodiment of the first aspect. For the beneficial technical effects of the embodiment of the third aspect, please refer to the description of the related embodiment of the first aspect. The details will not be described again here.

[0038] According to a fourth aspect, there is provided a communication device. The communication device includes a transceiver module and a processing module. The processing module is configured to generate a first signal. The transceiver module is configured to transmit the first signal to a second device, where the first signal transmitted by the first device has a first phase. The transceiver module is further configured to receive a second signal from the second device, where the second signal and the first signal are two signals having opposite transmission directions on a first transmission path, and the second signal received by the first device has a second phase, where the first phase and the second phase are used to adjust a data signal on the first transmission path.

[0039] Based on this technical solution, the phase of a first signal transmitted by a first device on a first transmission path is a first phase, and the phase of a second signal received on the first transmission path is a second phase. The second signal is generated by a second device based on the first signal, and the phase difference between the first phase and the second phase indicates the influence of the two bidirectional transmissions on the phase of the first transmission path, so that the first phase and the second phase can be used to adjust the data signal on the first transmission path, thereby improving the reliability of data signal transmission on the first transmission path.

[0040] In relation to the fourth aspect, in some implementations of the fourth aspect, the transceiver module is further configured to transmit phase information to the second device, the phase information being determined based on the first phase and the second phase, and the phase information being used to adjust the data signal.

[0041] In relation to the fourth aspect, in some implementations of the fourth aspect, the phase information indicates a measured phase difference, and the measured phase difference is determined based on the first phase and the second phase, or the phase information indicates a variable phase difference, and the variable phase difference is determined based on the measured phase difference and a reference phase difference.

[0042] In relation to the fourth aspect, in some implementations of the fourth aspect, the reference phase difference is a reference phase difference for signal transmission on a first transmission path, or the reference phase difference is a reference phase difference for signal transmission on a second transmission path, and the first transmission path is a transmission path different from the first transmission path.

[0043] In relation to the fourth aspect, in some implementations of the fourth aspect, the phase information includes corresponding information obtained by transforming the measured phase difference into at least one frequency point, or the phase information includes corresponding information obtained by transforming the varying phase difference into at least one frequency point.

[0044] With respect to the fourth aspect, in some implementations of the fourth aspect, the processing module is configured to adjust the data signal based on the first phase and the second phase.

[0045] In relation to the fourth aspect, in some implementations of the fourth aspect, the processing module is configured to adjust frequency domain information corresponding to the data signal based on the first phase and the second phase; the processing module is configured to adjust time domain information corresponding to the data signal based on the first phase and the second phase; or the processing module is configured to adjust clock information based on the first phase and the second phase, and the clock information is used to transmit the data signal.

[0046] In relation to the fourth aspect, in some implementations of the fourth aspect, the transceiver module is configured to transmit the phase information to the second device via a first interface, and the first interface is one of the following interfaces: a Common Public Radio Interface (CPRI) or an enhanced Common Public Radio Interface (eCPRI).

[0047] The embodiment of the fourth aspect is a first device corresponding to the embodiment of the first aspect. For the beneficial technical effects of the embodiment of the fourth aspect, please refer to the description of the related embodiment of the first aspect. The details will not be described again here.

[0048] According to a fifth aspect, there is provided a communication device. The communication device includes a transceiver module and a processing module. The transceiver module is configured to receive a first signal from a first device. The processing module is configured to generate a second signal, the first signal and the second signal being used to adjust a data signal on a first transmission path. The transceiver module is further configured to transmit the second signal, the second signal and the first signal being two signals having opposite transmission directions on the first transmission path, and the phase of the second signal transmitted by the transceiver module is determined based on the phase of the first signal received by the transceiver module.

[0049] Based on this technical solution, the phase of a first signal transmitted by a first device on a first transmission path is a first phase, and the phase of a second signal received on the first transmission path is a second phase. The second signal is generated by a second device based on the first signal, and the phase difference between the first phase and the second phase indicates the influence of the two bidirectional transmissions on the phase of the first transmission path, so that the first phase and the second phase can be used to adjust the data signal on the first transmission path, thereby improving the reliability of data signal transmission on the first transmission path.

[0050] In relation to the fifth aspect, in some implementations of the fifth aspect, the transceiver module is further configured to receive phase information from the first device, the phase information being determined based on the first signal and the second signal, and the processing module is further configured to adjust the data signal of the first transmission path based on the phase information.

[0051] In relation to the fifth aspect, in some implementations of the fifth aspect, the phase information indicates a measured phase difference, and the measured phase difference is determined based on a first phase of a first signal transmitted by the first device and a second phase of a second signal received by the first device, or the phase information indicates a variable phase difference, and the variable phase difference is determined based on the measured phase difference and a reference phase difference.

[0052] In relation to the fifth aspect, in some implementations of the fifth aspect, the reference phase difference is a reference phase difference for signal transmission on a first transmission path, or the reference phase difference is a reference phase difference for signal transmission on a second transmission path, and the second transmission path is a transmission path different from the first transmission path.

[0053] In relation to the fifth aspect, in some implementations of the fifth aspect, the phase information indicates a corresponding value obtained by transforming a measured phase difference into at least one frequency point, or the phase information indicates a corresponding value obtained by transforming a varying phase difference into at least one frequency point.

[0054] In relation to the fifth aspect, in some implementations of the fifth aspect, the processing module is configured to adjust frequency domain information corresponding to the data signal based on the phase information; the processing module is configured to adjust time domain information corresponding to the data signal based on the phase information; or the processing module is configured to adjust clock information based on the phase information, and the clock information is used to transmit the data signal.

[0055] In relation to the fifth aspect, in some implementations of the fifth aspect, the transceiver module is configured to receive phase information from the first device via a first interface, and the first interface is one of the following interfaces: a Common Public Radio Interface (CPRI) or an enhanced Common Public Radio Interface (eCPRI).

[0056] The embodiment of the fifth aspect is a device of the second device corresponding to the embodiment of the first aspect. For the beneficial technical effects of the embodiment of the fifth aspect, please refer to the description of the related embodiment of the first aspect. The details will not be described again here.

[0057] According to a sixth aspect, there is provided a communication method, which may be performed by a first device or a chip in the first device, and which includes the first device transmitting phase information to a second device, the phase information being used to adjust a data signal of a first transmission path, the first transmission path being a transmission path between the first device and the second device.

[0058] According to a seventh aspect, there is provided a communication method, the method may be performed by a second device or a chip within the second device, the method including: the second device receiving phase information from the first device; and the second device adjusting a data signal of a first transmission path based on the phase information, the first transmission path being a transmission path between the first device and the second device.

[0059] According to an eighth aspect, there is provided a communication method, the method being executed by a first radio frequency device or a chip in the first radio frequency device, the method including: the first radio frequency device transmitting a first signal to a second radio frequency device; the phase of the first signal transmitted by the first radio frequency device being a first phase; the first radio frequency device receiving a second signal from the second radio frequency device; the second signal and the first signal being two signals having opposite transmission directions on a first transmission path; the phase of the second signal received by the first radio frequency device being a second phase; and the first phase and the second phase being used to adjust a data signal on the first transmission path.

[0060] In relation to the eighth aspect, in some implementations of the eighth aspect, the method further includes the first radio frequency device transmitting phase information to the second radio frequency device, the phase information being determined based on the first signal and the second signal, and the first radio frequency device adjusting a data signal of the first transmission path based on the phase information.

[0061] In relation to the eighth aspect, in some implementations of the eighth aspect, the method further includes the first radio frequency device transmitting phase information to the baseband device, the phase information being determined based on the first signal and the second signal, and the phase information being used to adjust the data signal of the first transmission path.

[0062] According to a ninth aspect, there is provided a communications device, the communications device including a processor. The processor may be coupled to a memory and configured to execute instructions in the memory to perform the method of any one of the first aspect and possible implementations thereof. Optionally, the device further includes the memory. Optionally, the device further includes a communications interface, the processor being coupled to the communications interface.

[0063] In one embodiment, the device is the first device. When the device is the first device, the communication interface may be a transceiver or an input / output interface.

[0064] In another embodiment, the device is a chip or chip system configured in the first device. When the device is a chip configured in the first device, the communication interface may be an input / output interface. The chip system includes at least one chip and may further include other circuit structures and / or individual devices.

[0065] Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0066] According to a tenth aspect, there is provided a communications device, the communications device including a processor. The processor may be coupled to a memory and configured to execute instructions in the memory to perform the method of any one of the second aspect and possible implementations of the second aspect. Optionally, the device further includes the memory. Optionally, the device further includes a communications interface, the processor being coupled to the communications interface.

[0067] In one embodiment, the device is a second device. When the device is a second device, the communication interface may be a transceiver or an input / output interface.

[0068] In another embodiment, the device is a chip or chip system configured in a second device. When the device is a chip configured in a second device, the communication interface may be an input / output interface.

[0069] Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0070] According to an eleventh aspect, the present application provides a processor including an input circuit, an output circuit, and a processing circuit configured to receive signals via the input circuit and transmit signals via the output circuit such that the processor performs the method of the previous aspect.

[0071] In a specific implementation process, the processor may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a trigger, or various logic circuits, etc. An input signal received by an input circuit may be, for example, but not limited to, received and input by a receiver, and a signal output by an output circuit may be, for example, but not limited to, output to a transmitter and transmitted by the transmitter, and the input circuit and the output circuit may be the same circuit, which is used as an input circuit and an output circuit at different times. The specific implementation of the processor and various circuits is not limited in the embodiments of the present application.

[0072] According to a twelfth aspect, the present application provides a processing device including a communication interface and a processor. The communication interface is coupled to the processor. The communication interface is configured to input and / or output information. The information includes at least one of instructions or data. The processor is configured to execute a computer program such that the processing device performs the method of the previous aspect.

[0073] According to a thirteenth aspect, the present application provides a processing device including a processor and a memory, wherein the processor is configured to read instructions stored in the memory, receive signals using a receiver, and transmit signals using a transmitter, such that the processing device performs the method of the previous aspect.

[0074] Optionally, there are one or more processors. If there is a memory, there may be one or more memories.

[0075] Optionally, the memory may be integrated with the processor, or the memory and the processor may be located separately.

[0076] In a specific implementation process, the memory may be a non-transitory memory such as a read only memory (ROM). The memory and the processor may be integrated into one chip or may be separately located on different chips. The type of memory and the manner in which the memory and the processor are located are not limited in this embodiment of the present application.

[0077] It should be understood that in the related information exchange process, for example, sending instruction information may be a process of outputting instruction information from a processor, and receiving instruction information may be a process of inputting the received instruction information to a processor. Specifically, the information output by the processor may be output to a transmitter, and the input information received by the processor may be from a receiver. The transmitter and receiver may be collectively referred to as a transceiver.

[0078] The devices of the twelfth and thirteenth aspects may be a chip or a chip system. The processor may be implemented by hardware or software. When the processor is implemented by hardware, the processor may be a logic circuit or an integrated circuit. When the processor is implemented by software, the processor may be a general-purpose processor or may be implemented by reading software code stored in a memory. The memory may be integrated into the processor or may exist independently outside the processor.

[0079] According to a fourteenth aspect, the present application provides a computer program product. The computer program product includes a computer program (also called code or instructions). When the computer program is executed, the computer is enabled to perform the method of the aforementioned aspect.

[0080] According to a fifteenth aspect, the present application provides a computer-readable storage medium. The computer-readable storage medium stores a computer program (which may also be referred to as code or instructions). When the computer program runs on a computer, the computer is enabled to perform the method of the aforementioned aspect.

[0081] According to a sixteenth aspect, the present application provides a system including the first device and the second device described above. [Brief explanation of the drawings]

[0082] [Figure 1] 1 is a schematic diagram of a system to which a method according to an embodiment of the present application can be applied; [Figure 2] FIG. 2 is a schematic diagram of a functional division scheme for different interfaces applicable to an embodiment of the present application; [Figure 3] 1 is a schematic diagram of a system in which multiple connection methods are applicable according to an embodiment of the present application; [Figure 4] FIG. 1 is an illustration of a phase difference and a variable phase difference according to an embodiment of the present application. [Figure 5] 1 is a schematic flowchart of a communication method according to an embodiment of the present application; [Figure 6] 4 is a schematic flowchart of two methods for obtaining a reference phase difference by a baseband unit according to an embodiment of the present application; [Figure 7] 1 is a schematic flowchart of a method for communication between different wireless units according to an embodiment of the present application; [Figure 8] 2 is a schematic flowchart of a method for communication between different baseband units according to an embodiment of the present application; [Figure 9] FIG. 2 is an explanatory diagram of signal transmission between a baseband unit and a radio unit. [Figure 10] 1 is a schematic diagram of a possible structure of a communication device according to an embodiment of the present application; [Figure 11] 1 is a schematic diagram of a possible structure of a communication device according to an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0083] The following describes the technical solutions of the embodiments in this application with reference to the accompanying drawings.

[0084] The technical solutions in the embodiments of the present application may be applied to various communication systems, such as a long term evolution (LTE) system, a frequency division duplex (FDD) system, a time division duplex (TDD) system, a fifth generation (5G) system, a new radio (NR) system, a sixth generation (6G) system, or a future communication system. The 5G mobile communication system in the present application includes a non-standalone (NSA) 5G mobile communication system or a standalone (SA) 5G mobile communication system. Alternatively, the communication system may be a public land mobile network (PLMN), a device-to-device (D2D) communication system, a machine-to-machine (M2M) communication system, an Internet of things (IoT) communication system, a vehicle-to-everything (V2X) communication system, an unmanned aerial vehicle (UAV) communication system, or another communication system.

[0085] In addition, the network architectures and service scenarios described in the embodiments of the present application are intended to more clearly explain the technical solutions in the embodiments of the present application, and do not constitute limitations on the technical solutions provided in the embodiments of the present application. Those skilled in the art may know that with the development of network architectures and the emergence of new service scenarios, the technical solutions provided in the embodiments of the present application can also be applied to similar technical problems.

[0086] To facilitate understanding of the embodiments of the present application, the application scenario of the embodiments of the present application will be first described in detail with reference to FIG.

[0087] 1 is a schematic diagram of the structure of a communication system to which an embodiment of the present application can be applied. First, an apparatus that can be used in the communication system is described.

[0088] Radio unit (RU) 110: The radio unit 110 may perform functions such as intermediate frequency processing, radio frequency processing, and signal duplexing. For example, the radio unit 110 may be a remote radio unit (RRU), an active antenna unit (AAU), an open-radio unit (O-RU) in an open-radio access network (O-RAN), or another network element or communication device capable of processing intermediate frequency signals, radio frequency signals, or intermediate radio frequency signals.

[0089] Baseband unit (BU) 120: The baseband unit 120 may realize a function of processing a baseband signal. For example, the baseband unit 120 may be a baseband unit (BBU), a central unit (CU), a distributed unit (DU), an open-distributed unit (O-DU) in an O-RAN, or another network element or communication device capable of processing a baseband signal. A module configured to perform baseband processing in the baseband unit 120 may be referred to as a baseband board, and the number of baseband boards may be one or more.

[0090] The communication interface between the baseband unit 120 and the radio unit 110 may be referred to as a fronthaul interface. For example, the fronthaul interface may be a common public radio interface (CPRI), an eCPRI interface, or another interface defined in the future that is used to connect the baseband unit 120 and the radio unit 110. This is not particularly limited in this application.

[0091] Different interfaces may use different function division schemes. The following describes different interfaces using an example of an O-RAN system to which this embodiment of the present application is applicable.

[0092] FIG. 2 is a schematic diagram of a functional division scheme of different interfaces applicable to one embodiment of the present application.

[0093] See Figure 2. In the splitting scheme where a CPRI interface is adopted, in the downlink direction, the O-DU may have the functions of radio link control (RLC), medium access control (MAC), as well as coding, rate matching, scrambling, modulation, layer mapping, pre-coding, resource element mapping, inverse fast fourier transformation (IFFT), and cyclic prefix addition. Correspondingly, in the uplink direction, the O-DU may have the functions of inverse fast transformation (FFT), cyclic prefix removal, resource element de-mapping, channel estimation / equalization, inverse discrete Fourier transform (IDFT), demodulation, de-scrambling, rate de-matching, decoding, and medium access control (MAC), as well as radio link control (RLC). The O-RU has the corresponding functions for the downlink and radio frequency directions.

[0094] The eCPRI interface may use multiple baseband processing division schemes. The baseband division may be symmetric in the uplink and downlink directions, or asymmetric in the uplink and downlink directions. Figure 2 shows one of the schemes, which is not particularly limited in this application. In the division scheme used by the eCPRI interface shown in Figure 2, in the downlink direction, the O-DU may have the functions of radio link control (RLC), medium access control (MAC), as well as coding, rate matching, scrambling, modulation, and layer mapping. In the uplink direction, the O-DU may have the functions of channel estimation / equalization, inverse discrete Fourier transform (IDFT), demodulation, descrambling, rate dematching, decoding, and medium access control (MAC), as well as radio link control (RLC). In the downlink direction, the O-RU has the functions of precoding, resource element mapping, inverse fast Fourier transformation (IFFT), and cyclic prefix addition, as well as radio frequency.In the uplink direction, the O-RU has the functions of radio frequency, inverse fast transformation (FFT), cyclic prefix removal, and resource element de-mapping.

[0095] FIG. 3 is a schematic diagram of a system to which multiple connection methods can be applied according to an embodiment of the present application. The system may include multiple radio units in a direct connection method. See, for example, FIG. 3(a). The baseband unit 121 is directly connected to the radio unit 111 and the radio unit 112, respectively, and the baseband unit 111 communicates directly with the radio unit 112 via an interface (e.g., an ecpri interface). The system may also include multiple radio units in a cascade connection method. See, for example, FIG. 3(b). The baseband unit 122 is directly connected to the radio unit 113, and the radio unit 113 is directly connected to the radio unit 114, and the baseband unit 122 can communicate directly with the radio unit 113, and the baseband unit 122 and the radio unit 114 communicate with each other using the radio unit 113. The system may also include multiple baseband units. See, for example, FIG. 3(c). The baseband unit 123 and the baseband unit 124 are directly connected. The system may further include at least one radio unit (not shown), which may be connected with reference to the direct connection method described above, or may be connected with reference to the cascade connection method described above.

[0096] It should be understood that the above describes only some connection methods applicable to the embodiments of the present application. There may be other connection methods applicable to the embodiments of the present application, in which the radio unit and the baseband unit can communicate with each other, which are not particularly limited in the present application.

[0097] The environment of the transmission path between two network devices, for example, between the baseband unit 120 and the radio unit 110 shown in Fig. 1, may affect the phase of the data signal. To facilitate understanding of the embodiments of the present application, the following describes the phase difference and phase variation with reference to Fig. 4.

[0098] FIG. 4 is an explanatory diagram of a phase difference and a variable phase difference. Please refer to FIG. 4. An example is used in which a baseband unit transmits a signal based on a clock signal (e.g., a 122.88 MHz clock). Radio unit #1 receives signal 1 from the baseband unit at time t1. It can be seen that a phase difference (which may also be called phase drift) occurs between signal 1 after transmission and the clock signal. The phase difference may prevent the receiving end of signal 1 from correctly analyzing signal 1. In addition, as time passes, the environment of the transmission path between the baseband unit and radio unit #1 may also change. For example, the temperature or humidity changes on the transmission path between time t1 and time t2. Radio unit #1 receives signal 2 from the baseband unit at time t2, and signal 2 is still transmitted by the baseband unit based on the clock signal. However, please refer to FIG. 4. There is also a phase difference between signal 2 received by radio unit #1 and signal 1, which may be called a variable phase difference #1, i.e., a phase difference caused by phase fluctuation. The variable phase difference affects the stability of the data signal transmitted between the baseband unit and radio unit #1, further affecting the reliability of data signal transmission. When the baseband unit is connected to multiple radio units, for example, in a direct connection or cascade connection manner as shown in FIG. 3, the multiple radio units can cooperate with each other. However, because the transmission paths between the baseband unit and different radio units are different, the effects of the different transmission paths on the phase of the data signal may also be different. See, for example, FIG. 4. There is also a phase difference between signal 2 received from the baseband unit by radio unit #1 at time t2 and signal 3 received from the baseband unit by radio unit #2 at time t2. This phase difference may be referred to as variable phase difference #2, and variable phase difference #2 may affect the cooperation between radio unit #1 and radio unit #2. This reduces the reliability of data transmission. Therefore, embodiments of the present application provide a communication method, a communication device, and a communication system to improve the reliability of data transmission. The communication method will be described first below with reference to FIGS. 5 to 10.

[0099] The methods shown in Figures 5 to 6 may be applied to a first device and a second device. In Figures 5 and 6, an example in which baseband unit #1 is used as the first device and radio unit #1 is used as the second device is used for illustration purposes. The method shown in Figure 7 may be applied to different radio frequency devices. In Figure 8, radio unit #1 and radio unit #2 are used as illustration purposes. The method shown in Figure 8 may be applied to different control devices. In Figure 9, baseband unit #1 and baseband unit #2 are used as illustration purposes.

[0100] FIG. 5 is a schematic flowchart of a communication method according to an embodiment of the present application.

[0101] The method shown in FIG. 5 may be applied to a first device and a second device. For the sake of explanation, the following uses an example in which the first device is baseband unit #1 and the second device is wireless unit #1. Details will not be described below. The baseband unit #1 and wireless unit #1, e.g., the baseband unit 121 and wireless unit 111 shown in FIG. 3(a) and the baseband unit 122 and wireless unit 113 shown in FIG. 3(b), may be directly connected. Alternatively, the baseband unit #1 and wireless unit #1, e.g., the baseband unit 122 and wireless unit 114 shown in FIG. 3(b), may communicate with each other using another network device. Alternatively, the baseband unit #1 and the wireless unit #1 may use another connection method that allows the baseband unit #1 and the wireless unit #1 to communicate with each other. This is not particularly limited in this application.

[0102] S510: The baseband unit #1 transmits a first signal to the wireless unit #1, and in response, the wireless unit #1 receives the first signal from the baseband unit #1.

[0103] The phase of the first signal transmitted by baseband unit #1 is the first phase.

[0104] Baseband unit #1 may transmit a first signal to radio unit #1 via a first interface, which may be a cpri interface, an ecpri interface, or another interface defined in the future used for communication between the baseband unit and the radio unit.

[0105] The phase of the first signal transmitted by the baseband unit #1 may be determined based on the phase of the clock. For example, the first signal may be a signal obtained by clock modulation, a signal transmitted by a clock, or a signal carrying clock information.

[0106] For example, baseband unit #1 may transmit a first signal based on a local clock source (e.g., a 122.88 MHz system clock), where the frequency of the first signal is 122.88 MHz and the first phase is the initial phase carried by the clock source.

[0107] It should be noted that the first signal may be any signal received or transmitted between the baseband unit and the radio unit. After receiving the first signal, the radio unit may obtain the phase of the received first signal by clock data recovery (CDR). It can be understood that in a case where the baseband unit and the radio unit process data services, the first signal may be a data service signal that can be transmitted between the baseband unit and the radio unit, and in a case where the baseband unit and the radio unit do not process data services, the first signal may be a signal used for communication negotiation between the baseband unit and the radio unit. In other words, in this embodiment, the phase can be measured using a signal transmitted between the baseband unit and the radio unit, and dedicated transmission resources do not need to be allocated to the first signal for phase measurement, which can support frequent signal measurement, can reduce the impact on service data transmission, and can save consumption of transmission resources.

[0108] S520: The wireless unit #1 transmits a second signal to the baseband unit #1 based on the first signal, and in response, the baseband unit #1 receives the second signal from the wireless unit #1.

[0109] The second signal and the first signal are two signals whose transmission directions are opposite to each other on the first transmission path, and the phase of the second signal received by baseband unit #1 is the second phase.

[0110] It should be noted that the first transmission path is a transmission path between the radio unit #1 and the baseband unit #1, for example, an optical fiber transmission path between the radio unit #1 and the baseband unit #1. In addition, the first transmission path may be a transmission path supporting bidirectional signal transmission (e.g., an optical fiber supporting bidirectional signal transmission). Alternatively, the first transmission path may be two unidirectional physical transmission paths in approximately the same environment (e.g., two unidirectional optical fibers in the same environment). Specifically, the first signal and the second signal are transmitted over two different physical transmission paths, but the transmission environments of the two physical transmission paths are similar, for example, the transmission distance, temperature, and humidity of the transmission paths are similar. Therefore, the effect of transmission over the first transmission path on the phase of the first signal may be considered to be approximately the same as that on the phase of the second signal.

[0111] It should be further noted that the time when baseband unit #1 transmits the first signal is closely related to the time when radio unit #1 transmits the second signal, i.e., the time interval is short. In other words, within the time interval, the transmission environment of the first transmission path does not significantly affect the phase of the signal. Therefore, when it is determined that the phase of the signal transmitted on the first transmission path has changed, the phase change experienced when baseband unit #1 transmits the first signal can be considered to be approximately the same as the phase change experienced when radio unit #1 transmits the second signal. For example, if baseband unit #1 transmits the first signal and the phase of the first signal is delayed by one degree in the process of transmitting the first signal on the first transmission path, the phase of the second signal can also be considered to be delayed by one degree in the process of transmitting the second signal on the first transmission path.

[0112] In this embodiment of the present application, it can be understood that the phase difference, phase drift, or phase change refers to a directional phase amplitude change, for example, a lag amplitude or a lead amplitude, which will not be described in detail again below.

[0113] The radio unit #1 may generate a second signal based on the first signal using an optical propagation mirror and return the second signal to the baseband unit #1.

[0114] In a possible embodiment, the radio unit #1 may perform a phase locking process on the first signal to generate the second signal. The phase locking process may be understood as performing a specific circuit process on the first signal so that the phase of the first signal remains constant. For example, the radio unit #1 may include a phase locked loop (PLL) module, and the phase difference between the first signal input to the PLL module and the second signal output from the PLL module remains constant.

[0115] In a possible implementation, the second signal may be any signal received or transmitted between the baseband unit and the radio unit. After receiving the second signal, the baseband unit may obtain the phase of the received second signal through the CDR. In addition, it may be understood that the first signal and the second signal may be signals carrying different data. For example, after the clock of the first signal is restored by the CDR, the clock may be added to another uplink signal, i.e., the second signal. Therefore, the method in this embodiment of the present application can reduce the impact on service data transmission.

[0116] The baseband unit #1 may determine the phase difference based on the first phase of the transmitted first signal and the second phase of the received second signal. The baseband unit #1 may determine the phase difference in a number of ways. The method by which the baseband unit #1 determines the phase difference is not limited in this application. The following describes possible determination methods as examples.

[0117] For example, the baseband unit #1 may perform a modulation process separately on a first clock carried by the first signal and a second clock carried by the second signal, and obtain a measured phase difference using the phase difference obtained by comparing the signal modulated by the first clock with the signal modulated by the second clock. The modulation process may involve multiplying a clock and a modulating signal at frequency points to generate a new signal. For example, the baseband unit #1 may multiply the first clock used to transmit the first signal by the modulating signal at frequency points to obtain the signal modulated by the first clock. Correspondingly, the baseband unit #1 may recover the second signal to obtain the second clock, and may multiply the second clock and the modulating signal at frequency points to obtain the signal modulated by the second clock. The baseband unit #1 may determine the phase difference between the first signal and the second signal by comparing the phase difference between the two modulated signals.

[0118] In another example, the baseband unit #1 performs a frequency multiplication process separately on a first clock carried by a first signal and a second clock carried by a second signal, and obtains a measured phase difference using a delay obtained by comparing the clock obtained by frequency multiplication of the first clock with the clock obtained by frequency multiplication of the second clock. The frequency multiplication process means that a high-frequency clock is obtained by performing frequency multiplication on the clock so that the phase difference can be expressed using a delay difference.

[0119] In another example, the baseband unit #1 converts the first clock carried by the first signal and the second clock carried by the second signal into voltages separately using circuit processing, and then compares the voltages to obtain a voltage difference to determine a measured phase difference. Circuit processing may refer to a circuit in which the clock is used as an input, and the output voltage of the circuit may represent the phase of the clock. For example, the baseband unit #1 uses the first clock as an input signal to the circuit and measures the voltage amplitude of the output voltage. Correspondingly, the baseband unit #1 also uses the second clock as an input signal to the circuit and measures the voltage amplitude corresponding to the output voltage. The baseband unit #1 compares the two voltage amplitudes to determine the phase difference between the first signal and the second signal.

[0120] It can be understood that the phase difference between the first phase of the first signal transmitted by baseband unit #1 and the second phase of the second signal received by baseband unit #1 is caused by two transmissions on the first transmission path. Therefore, baseband unit #1 may process the phase difference determined in the above manner to obtain a measured phase difference caused by one transmission on the first transmission path. For example, baseband unit #1 may divide the difference between the first phase and the second phase by two as the measured phase difference. For example, if baseband unit #1 determines that the second signal is delayed by 8 degrees compared to the phase of the first signal, baseband unit #1 may determine that the measured phase difference is delayed by 4 degrees.

[0121] In a possible embodiment, the measured phase difference may be used to adjust the data signal of the first transmission path. Specifically, the baseband unit #1 or the radio unit #1 may perform phase compensation on the data signal of the first transmission path based on the measured phase difference to improve the reliability of the data signal transmission, thereby compensating for the data signal affected by the first transmission path transmitted between the baseband unit #1 and the radio unit #1.

[0122] In another possible embodiment, the measured phase difference may not affect the analysis of the data signal. For example, the receiving end of the data signal may preconfigure a reference phase difference or may be informed of the reference phase difference and analyze the data signal based on the reference phase difference. If the difference between the measured phase difference and the reference phase difference is less than a certain threshold, the baseband unit #1 or the radio unit #1 may no longer perform phase compensation on the data signal of the first transmission path based on the measured phase difference. If the difference between the measured phase difference and the reference phase difference is equal to or greater than a certain threshold, the baseband unit #1 may perform phase compensation on the data signal of the first transmission path based on the difference between the reference phase difference and the measured phase difference. When the reference phase difference is the reference phase difference of the first transmission path, the difference between the measured phase difference and the reference phase difference may be caused by environmental changes in the first transmission path, such as the variable phase difference #1 shown in FIG. 4. When the reference phase difference is a different transmission path (e.g., a second transmission path between baseband unit #1 and radio unit #2), the difference between the measured phase difference and the reference phase difference may be affected by the environmental difference between the first transmission path and the second transmission path, for example, the variable phase difference #2 shown in FIG. 4.

[0123] Therefore, because the transmission distance of the transmission path usually does not change and other environmental factors such as temperature usually change slowly, it can be assumed that the influence of the transmission path on the phase of the data signal does not change or changes slightly over a certain period of time. Therefore, after obtaining the measured phase difference through measurement, the baseband unit #1 can compare the measured phase difference with the reference phase difference and adjust the data signal of the first transmission path based on the varying phase difference between the measured phase difference and the reference phase difference. Therefore, the number or degree of compensation performed on the data signal can be reduced to improve the efficiency of data signal transmission while improving the reliability of data signal transmission. The following describes the method of obtaining the reference phase difference in step S530.

[0124] Optionally, in S530, the baseband unit #1 obtains a reference phase difference.

[0125] The reference phase difference is a reference phase difference for signal transmission on a first transmission path, or the reference phase difference is a reference phase difference for a second transmission path, where the first transmission path and the second transmission path are different transmission paths. To facilitate understanding of step S530, two methods by which the baseband unit #1 acquires a reference phase difference will be described below with reference to FIG. 6. Method a is used to acquire a reference phase difference for signal transmission on the first transmission path, and method b is used to acquire a reference phase difference for signal transmission on the second transmission path.

[0126] Method a: S531a: The baseband unit #1 transmits a third signal to the wireless unit #1, and in response, the wireless unit #1 receives the third signal from the baseband unit #1.

[0127] It should be noted that the point in time at which baseband unit #1 transmits the third signal to wireless unit #1 occurs before the point in time at which baseband unit #1 transmits the first signal to wireless unit #1.

[0128] The phase of the third signal transmitted by the baseband unit #1 is the third phase. The method of transmitting the third signal by the baseband unit #1 to the wireless unit #1 is the same as the method of transmitting the first signal in step S510. The details will not be described again here.

[0129] S532a: The wireless unit #1 transmits a fourth signal to the baseband unit #1 based on the third signal, and in response, the baseband unit #1 receives the fourth signal from the wireless unit #1.

[0130] The phase of the fourth signal received by the baseband unit #1 is the fourth phase. The method of transmitting the fourth signal by the radio unit #1 to the baseband unit #1 is the same as the method of transmitting the second signal in step S520. The details will not be described again here.

[0131] S533a: The baseband unit #1 determines a reference phase difference based on the third phase and the fourth phase.

[0132] The method by which the baseband unit #1 determines the reference phase difference based on the third and fourth phases is similar to the method by which the baseband unit #1 determines the measured phase difference based on the first and second phases, as described in step S520. For example, the reference phase difference is half the difference between the third and fourth phases. Details will not be described again here.

[0133] Therefore, the reference phase difference can be used as the reference phase difference of the first transmission path.

[0134] For example, baseband unit #1 may periodically transmit multiple signals to radio unit #1 and receive signals corresponding to the multiple signals from radio unit #1. The third signal may be the first signal of the multiple signals. Specifically, baseband unit #1 may use a measured phase difference obtained by an initial measurement as a reference phase difference and compare a measured phase difference obtained by a subsequent measurement with the reference phase difference to obtain a variable phase difference. The variable phase difference is used to adjust the data signal of the first transmission path.

[0135] For example, the phase of a signal initially transmitted by baseband unit #1 is an initial phase phase_0 conveyed by the clock source, and the phase based on the signal received by baseband unit #1 is phase_r_0. Since a phase difference phase_r_0-phase_0 is acquired during bidirectional transmission on the first transmission path, the phase change during unidirectional transmission on the first transmission path is delta_phase_0=(phase_r_0-phase_0) / 2, which can be set as the reference phase difference. Thereafter, baseband unit #1 may transmit and receive signals to and from radio unit #1 based on a preset period to acquire a measured phase difference, and determine a variable phase difference based on the measured phase difference and the reference phase difference. This allows baseband unit #1 or radio unit #1 to adjust the data signal of the first transmission path based on the variable phase difference. For example, if the phase of the signal transmitted by baseband unit #1 at the i-th time point is phase_0 and the phase of the signal received by baseband unit #1 is phase_r_i, the measured phase difference is (phase_r_i-phase_0) / 2 and the varying phase difference is (phase_r_i-phase_0) / 2-(phase_r_0-phase_0) / 2.

[0136] Therefore, in method a, the reference phase difference is the reference phase difference of the first transmission path, and phase compensation is performed using a variable phase difference obtained based on the reference phase difference, thereby maintaining the influence of the first transmission path on the phase of the data signal at a constant level and improving the reliability of data signal transmission on the first transmission path.

[0137] Method b: S531b: The baseband unit #1 transmits a fifth signal to the wireless unit #2, and in response, the wireless unit #2 receives the fifth signal from the baseband unit #1.

[0138] The phase of the fifth signal transmitted by the baseband unit #1 is the fifth phase, and the manner in which the baseband unit #1 transmits the fifth signal to the wireless unit #2 is the same as the manner in which the second signal is transmitted in step S510, and the details will not be described again here.

[0139] In a possible embodiment, the time when baseband unit #1 transmits the fifth signal to wireless unit #2 is the same as the time when baseband unit #1 transmits the first signal to wireless unit #1, or the interval between the time when baseband unit #1 transmits the fifth signal to wireless unit #1 and the time when baseband unit #1 transmits the first signal to wireless unit #1 is equal to or less than a certain threshold. Therefore, the measured phase difference and the reference phase difference are obtained by baseband unit #1, which synchronously transmits and receives signals with different wireless units, thereby improving the reliability of cooperative operation of multiple wireless units.

[0140] S532b: The wireless unit #2 transmits a sixth signal to the baseband unit #1 based on the fifth signal, and in response, the baseband unit #1 receives the sixth signal from the wireless unit #2.

[0141] The phase of the sixth signal received by baseband unit #1 is the sixth phase. The method of transmitting the sixth signal by wireless unit #2 to baseband unit #1 is the same as the method of transmitting the second signal in step S520. Details will not be described again here.

[0142] S533b: The baseband unit #1 determines a reference phase difference based on the fifth phase and the sixth phase.

[0143] The method by which the baseband unit #1 determines the reference phase difference based on the fifth and sixth phases is similar to the method by which the baseband unit #1 determines the measured phase difference based on the first and second phases, as described in step S520. For example, the reference phase difference is half the difference between the fifth and sixth phases. Details will not be described again here.

[0144] Therefore, in method b, the reference phase difference can be used as the reference phase difference of the second transmission path, and phase compensation is performed on the data signal of the first transmission path based on the variable phase difference obtained using the reference phase difference, so that the effects of the two transmission paths on the phase of the data signal can be matched and the reliability of cooperation between multiple wireless units can be improved.

[0145] The above describes two methods for determining the reference phase difference. In this embodiment of the present application, the reference phase difference may alternatively be a phase difference of the first transmission path or another transmission path that is pre-configured, generated based on the clock source of the baseband unit #1, or obtained by measurement in another manner. This is not particularly limited in the present application.

[0146] In this embodiment of the present application, the phase compensation of the data signal of the first transmission path may be performed by the baseband unit #1 or the radio unit #1. The following describes the methods in which the baseband unit #1 or the radio unit #1 adjusts the data signal. Method A is a method in which the baseband unit #1 adjusts the data signal, and Method B is a method in which the radio unit #1 adjusts the data signal.

[0147] It should be noted that in some scenarios, based on different design divisions of the operations of the radio unit #1 and the baseband unit #1, for example, in the ecpri transmission protocol, some baseband processing may be performed by the radio unit #1 or by the baseband unit #1. Phase compensation for the data signal of the first transmission path may also be performed jointly by the baseband unit #1 and the radio unit #1. The joint compensation scheme may be similar to that of Scheme A and Scheme B below, which will not be described again here.

[0148] Method A: S540A: The baseband unit #1 conditions the data signal of the first transmission path.

[0149] It can be understood that the data signal of the first transmission path includes a data signal transmitted by the baseband unit #1 to the radio unit #1 and a data signal transmitted by the radio unit #1 to the baseband unit #1.

[0150] In a possible embodiment, baseband unit #1 may adjust the data signal of the first transmission path based on the measured phase difference.

[0151] In another possible embodiment, the baseband unit #1 may adjust the data signal of the first transmission path based on the aforementioned varying phase difference.

[0152] The following will uniformly describe how baseband unit #1 adjusts the data signal based on the phase difference (measured phase difference or variable phase difference).

[0153] Method 1: The baseband unit #1 adjusts the frequency domain information corresponding to the data signal based on the phase difference.

[0154] For example, the baseband unit #1 may convert the phase difference into at least one frequency, specifically, determine a phase change for each frequency point at the at least one frequency point, and superimpose the phase change corresponding to the frequency point on each frequency point. The at least one frequency point may be any frequency point set by the system. For example, the at least one frequency point may be a frequency point established by the radio unit #1. This is not particularly limited in the present application.

[0155] The baseband unit #1 may perform the conversion based on the proportional relationship between the frequency corresponding to the phase difference (i.e., the measured frequency of the first signal and the second signal) and the frequency corresponding to each frequency point. For example, the phase difference phase of the 122.88 MHz frequency 122.88MHz However, the phase difference 4.9GHz =(4.9G / 122.88MHz)phase 122.88MHz is converted to a frequency point at 4.9 GHz frequency to obtain

[0156] In a possible embodiment, if the difference between the converted phase differences between two adjacent frequency points is less than a certain threshold, the baseband unit #1 may compensate for the same phase difference at the two frequency points. The same phase difference may be one of the two converted phase differences. Therefore, the amount of compensation calculation can be reduced and the efficiency of adjusting the data signal can be improved.

[0157] Method 2: Baseband unit #1 adjusts the time domain information corresponding to the data signal based on the phase difference.

[0158] For example, the baseband unit #1 may superimpose a corresponding phase difference at each of the at least one collection point. The at least one collection point may be any collection point set by the system. This is not particularly limited in the present application.

[0159] Method 3: The baseband unit #1 adjusts the clock information based on the phase difference, and the clock information is used to transmit the data signal.

[0160] For example, the baseband unit may adjust the phase conveyed by the local clock source such that the phase of the data signal transmitted based on the local clock source is compensated.

[0161] Therefore, in the method A, the baseband unit #1 may perform phase compensation on the data signal of the first transmission path based on the measured phase difference or the variable phase difference.

[0162] Method B: S541B: The baseband unit #1 transmits the phase information to the wireless unit #1, and in response, the wireless unit #1 receives the phase information from the baseband unit #1.

[0163] The phase information indicates a measured phase difference or a varying phase difference.

[0164] In a possible embodiment, the phase information further indicates to radio unit #1 to adjust the data signal of the first transmission path.

[0165] For example, the phase information may explicitly indicate a measured phase difference or a variable phase difference used to adjust the data signal. For example, the phase information may include a value of the measured phase difference or the variable phase difference. Alternatively, the phase information may indirectly or implicitly indicate a measured phase difference or a variable phase difference used to adjust the data signal. For example, the phase information includes values of a first phase and a second phase so that the wireless unit #1 can determine a measured phase difference based on the first phase and the second phase. In another example, the phase information includes a first phase, a second phase, and a reference phase difference so that the wireless unit #1 can determine a variable phase difference based on the first phase, the second phase, and the reference phase difference. It may be understood that when the wireless unit #1 preconfigures several phase values, for example, when the wireless unit #1 preconfigures the first phase, the phase information may not include the first phase. In another example, when the wireless unit #1 preconfigures a reference phase difference, the phase information may not include the reference phase difference, which can save transmission resources.

[0166] In a possible embodiment, baseband unit #1 may process the measured phase difference or the variable phase difference and then transmit the processed measured phase difference or the variable phase difference to radio unit #1. For example, if radio unit #1 may adjust frequency domain information of the data signal in Scheme 1, baseband unit #1 may convert the measured phase difference or the variable phase difference to at least one frequency point to generate information corresponding to each frequency point. The phase information includes information corresponding to at least one frequency point, and the information corresponding to each of the at least one frequency point indicates the amount of phase compensation for the frequency point. Therefore, the processing complexity of performing phase compensation by radio unit #1 can be reduced.

[0167] In a possible embodiment, baseband unit #1 may transmit phase information in a timestamp format. In other words, the phase information may indicate a measured phase difference or a variable phase difference using a timestamp. An example in which the phase information includes a value of a variable phase difference is used for explanation. Different time positions within a time unit are set to represent different phase values. For example, the length of the time unit is set to 10 ms, and a time mark at 1 ms in the time unit indicates a phase difference of 5 degrees, a time mark at 2 ms in the time unit indicates a phase difference of 10 degrees, and so on. The time mark may be one defined bit or specific data. This is not particularly limited in this application. Therefore, baseband unit #1 transmits phase information in a timestamp format, which can save transmission resources.

[0168] S542B: The wireless unit #1 adjusts the data signal of the first transmission path based on the phase information.

[0169] The wireless unit #1 may adjust the data signal of the first transmission path based on the measured phase difference or the variable phase difference. The method by which the wireless unit #1 adjusts the data signal is similar to the method by which the baseband unit #1 adjusts the data signal in step S540A. Details will not be described again here.

[0170] 5, the phase of a first signal transmitted by the baseband unit #1 on a first transmission path is a first phase, and the phase of a second signal received on the first transmission path is a second phase. The second signal is generated by the radio unit #1 based on the first signal, and the phase difference between the first phase and the second phase indicates the influence of the two bidirectional transmissions on the phase of the first transmission path. Therefore, the first phase and the second phase can be used to adjust the data signal on the first transmission path, and the reliability of the data signal transmission on the first transmission path can be improved.

[0171] In the technical solution shown in FIG. 5, it can be understood that the baseband unit #1 initiates phase measurement between the baseband unit #1 and the radio unit #1 to obtain a first phase of a transmitted first signal and a second phase of a received second signal. In a possible implementation, the phase measurement may be initiated by the radio unit #1. Specifically, the radio unit #1 transmits a first signal to the baseband unit #1, the baseband unit #1 transmits a second signal to the radio unit #1 based on the first signal, and the radio unit #1 obtains the first phase of the transmitted first signal and the second phase of the received second signal. The first phase and the second phase may be used by the baseband unit #1 or the radio unit #1 to perform phase compensation on the data signal of the first transmission path. This implementation is similar to the implementation described in FIG. 5. Details will not be described again here.

[0172] The above describes the adjustment of data signals in the first transmission path between baseband unit #1 and radio unit #1. In a possible embodiment, phase differences and phase variations may also occur for data signals in the third transmission path between radio unit #1 and radio unit #2. In the following, a method for adjusting data signals between different radio units will be described with reference to FIG. 7.

[0173] FIG. 7 is a schematic flowchart of a method for communication between different wireless units according to an embodiment of the present application.

[0174] S710: Wireless unit #1 transmits a seventh signal to wireless unit #2, and in response, wireless unit #2 receives a seventh signal from wireless unit #1.

[0175] Wireless unit #1 and wireless unit #2 may communicate with each other in a cascade connection manner as shown in FIG. 3, and the transmission path between wireless unit #1 and wireless unit #2 may be referred to as the third transmission path.

[0176] The phase of the seventh signal transmitted by wireless unit #1 is the seventh phase.

[0177] The method of transmitting the seventh signal by the wireless unit #1 to the wireless unit #2 is similar to the method of transmitting the first signal by the baseband unit #1 to the wireless unit #1 in step S510 of Fig. 5. The details will not be described again here.

[0178] S720: The wireless unit #2 transmits an eighth signal to the wireless unit #1 based on the seventh signal, and in response, the wireless unit #1 receives the eighth signal from the wireless unit #2.

[0179] The phase of the eighth signal received by baseband unit #1 is phase 8. The method of transmitting the eighth signal by wireless unit #2 to wireless unit #1 is similar to the method of transmitting the second signal by wireless unit #1 to baseband unit #1 in step S520 of Figure 5. The details will not be described again here.

[0180] Optionally, in S730, wireless unit #1 obtains a reference phase difference.

[0181] The method by which the wireless unit #1 acquires the reference phase difference is similar to the method by which the baseband unit #1 acquires the reference phase difference in step S530 of Fig. 5 and the method by which the baseband unit #1 acquires the reference phase difference in Fig. 6. The details will not be described again here.

[0182] The seventh phase and the eighth phase may be used to adjust the data signal of the third transmission path. For example, a measured phase difference between the seventh phase and the eighth phase may be used to perform phase compensation on the data signal of the third transmission path. In another example, a variable phase difference may be generated based on the seventh phase, the eighth phase, and a reference phase difference, and the variable phase difference may be used to perform phase compensation on the data signal of the third transmission path. Adjusting the data signal of the third transmission path may be performed by radio unit #1, radio unit #2, or baseband unit #1. Baseband unit #1 is a baseband unit that can communicate with radio unit #1 and radio unit #2. The following describes the three methods using examples.

[0183] Method α: S740α: The wireless unit #1 adjusts the data signal of the third transmission path based on the seventh phase and the eighth phase.

[0184] The manner in which the data signal is adjusted by the wireless unit #1 is similar to the manner in which the data signal is adjusted in step S540A of Fig. 5. The details will not be described again here.

[0185] Method β: S741β: The wireless unit #1 transmits the phase information to the wireless unit #2, and in response, the wireless unit #2 receives the phase information from the wireless unit #1.

[0186] The phase information indicates a measured phase difference between the seventh phase and the eighth phase, or a variable phase difference based on the seventh phase, the eighth phase, and a reference phase difference. The method by which wireless unit #1 transmits the phase information to wireless unit #2 is similar to the method by which baseband unit #1 transmits the phase information to wireless unit #1 in step S541B of FIG. 5. The details will not be described again here.

[0187] S742β: The wireless unit #2 adjusts the data signal of the third transmission path based on the fluctuation information.

[0188] The manner in which the data signal is adjusted by the wireless unit #2 is similar to the manner in which the data signal is adjusted in step S540A of Fig. 5. The details will not be described again here.

[0189] Method γ: S741γ: The wireless unit #1 transmits phase information to the baseband unit #1, and in response, the baseband unit #1 receives phase information from the wireless unit #1.

[0190] The phase information indicates a measured phase difference between the seventh phase and the eighth phase, or a variable phase difference based on the seventh phase, the eighth phase, and a reference phase difference. The method by which the wireless unit #1 transmits the phase information to the baseband unit #1 is similar to the method by which the baseband unit #1 transmits the phase information to the wireless unit #1 in step S541B of FIG. 5. The details will not be described again here.

[0191] S742γ: The baseband unit #1 adjusts the data signal of the third transmission path based on the fluctuation information.

[0192] The method of conditioning the data signal by baseband unit #1 is similar to the method of conditioning the data signal in step S540A of Fig. 5. The details will not be described again here.

[0193] Based on the technical solution shown in Figure 7, the phase of the seventh signal transmitted by wireless unit #1 on the third transmission path is the seventh phase, and the phase of the eighth signal received on the third transmission path is the eighth phase. The eighth signal is generated by wireless unit #2 based on the seventh signal, and the phase difference between the seventh phase and the eighth phase indicates the effect of two bidirectional transmissions on the phase of the third transmission path. Therefore, the seventh phase and the eighth phase can be used to adjust the data signal on the third transmission path, thereby improving the reliability of the data signal transmission on the third transmission path.

[0194] In a possible embodiment, multiple baseband units may cooperate with each other, and phase differences and phase variations may also occur with respect to the data signal of the fourth transmission path between baseband unit #1 and baseband unit #2. The following describes a method for adjusting data signals between different baseband units with reference to Figure 8.

[0195] FIG. 8 is a schematic flowchart of a method for communication between different baseband units according to an embodiment of the present application.

[0196] S810: The baseband unit #1 transmits a ninth signal to the baseband unit #2, and in response, the baseband unit #2 receives the ninth signal from the baseband unit #1.

[0197] The baseband unit #1 and the baseband unit #2 may communicate with each other in the connection manner shown in Fig. 3. The transmission path between the baseband unit #1 and the baseband unit #2 may be referred to as a fourth transmission path.

[0198] The phase of the ninth signal transmitted by baseband unit #1 is the ninth phase.

[0199] The method of transmitting the ninth signal by baseband unit #1 to baseband unit #2 is similar to the method of transmitting the first signal by baseband unit #1 to baseband unit #1 in step S510 of Figure 5. The details will not be described again here.

[0200] S820: Baseband unit #2 transmits a tenth signal to baseband unit #1 based on the ninth signal, and in response, baseband unit #1 receives the tenth signal from baseband unit #2.

[0201] The phase of the tenth signal received by baseband unit #1 is the tenth phase. The method of transmitting the tenth signal by baseband unit #2 to baseband unit #1 is similar to the method of transmitting the second signal by baseband unit #1 to baseband unit #1 in step 520 of Figure 5. The details will not be described again here.

[0202] Optionally, in S830, the baseband unit #1 obtains a reference phase difference.

[0203] The method by which the baseband unit #1 acquires the reference phase difference is similar to the method by which the baseband unit #1 acquires the reference phase difference in step S530 of Fig. 5 and the method by which the baseband unit #1 acquires the reference phase difference in Fig. 6. The details will not be described again here.

[0204] S840: The baseband unit #1 or the baseband unit #2 adjusts the data signal of the fourth transmission path based on the ninth phase and the tenth phase.

[0205] The ninth and tenth phases may be used to adjust the data signal of the fourth transmission path. For example, a measured phase difference between the eighth and tenth phases may be used to perform phase compensation on the data signal of the fourth transmission path. In another example, a variable phase difference may be generated based on the ninth and tenth phases and a reference phase difference, and the variable phase difference may be used to perform phase compensation on the data signal of the fourth transmission path. Adjusting the data signal of the fourth transmission path may be performed by baseband unit #1 or baseband unit #2. The execution method is similar to that of steps S540A, S541B, and S542B of FIG. 5. Details will not be described again here.

[0206] 8, the phase of the ninth signal transmitted by baseband unit #1 on the fourth transmission path is the ninth phase, and the phase of the tenth signal received on the fourth transmission path is the tenth phase. The tenth signal is generated by baseband unit #2 based on the ninth signal, and the phase difference between the ninth phase and the tenth phase indicates the effect of two bidirectional transmissions on the phase of the fourth transmission path. Therefore, the ninth phase and the tenth phase can be used to adjust the data signal on the fourth transmission path, thereby improving the reliability of data signal transmission on the fourth transmission path.

[0207] To facilitate understanding of the embodiments of the present application, the following describes the signal transmission method with reference to FIG. 9 , using an example in which a first signal and a second signal are transmitted and received between a first device and a second device in the manner shown in FIG. 5 .

[0208] FIG. 9 is an explanatory diagram of signal transmission between the baseband unit and the radio unit.

[0209] See FIG. 9. A first device may perform baseband processing on a downlink data signal to generate a first signal and package the processed data signal based on a local clock according to the CPRI protocol. The first signal carries an initial phase (i.e., a first phase) of the local clock, and the first device transmits the first signal to a second device using a serializer. The second device receives the first signal using a deserializer and recovers a clock signal and a data signal from the first signal according to the CPRI protocol. The recovered clock signal may lock the phase of the received first signal using a phase-locked loop, and an uplink data signal may be packaged according to the CPRI protocol based on the recovered clock signal and the uplink data signal that has undergone radio frequency processing to generate a second signal. The second signal carries the phase of the first signal received by the second device, and the second device transmits the second signal to the first device using a serializer. The first device receives the second signal using a deserializer and recovers a clock signal and a data signal from the second signal according to the cpri protocol. The recovered clock signal carries a second phase of the second signal received by the first device, so that the first phase and the second phase can be used to adjust the data signal transmitted between the first device and the second device. In addition, the downlink data signal recovered by the radio unit and the uplink data signal recovered by the baseband unit cannot be affected by the measurement process, i.e., the technical solution cannot affect the normal operation of the service data signal.

[0210] The method provided in the embodiment of the present application has been described in detail above with reference to Figures 5 to 9. The apparatus provided in the embodiment of the present application will be described in detail below with reference to Figures 10 and 11. It should be understood that the description of the apparatus embodiment corresponds to the description of the method embodiment. Therefore, for the contents not described in detail, please refer to the aforementioned method embodiment. For the sake of brevity, the details will not be described again here.

[0211] 10 and 11 are schematic diagrams of possible device structures according to embodiments of the present application. These devices may be configured to implement the functions of the first device (e.g., baseband unit #1) and the second device (e.g., radio unit #1) in the above-mentioned method embodiments, and thus can also realize the beneficial effects of the above-mentioned method embodiments. In the embodiments of the present application, the device may be the first device or the second device, or may be a module (e.g., a chip) used in the first device or the second device.

[0212] As shown in Figure 10, apparatus 1000 includes a processing module 1010 and a transceiver module 1020. Apparatus 1000 is configured to implement the functions of the first device and the second device in the method embodiment shown in Figure 5. Alternatively, apparatus 1000 may include modules configured to implement any function or operation of the first device or the second device in the method embodiment shown in Figure 5, and the modules may be implemented in whole or in part using software, hardware, firmware, or any combination thereof.

[0213] When the apparatus 1000 is configured to realize the functions of the first apparatus in the embodiment of the method shown in FIG. 5 , the processing module 1010 is configured to generate a first signal, the transceiver module 1020 is configured to transmit the first signal to the second apparatus, the phase of the first signal transmitted by the first apparatus being a first phase, the transceiver module 1020 is further configured to receive a second signal from the second apparatus, the second signal and the first signal being two signals whose transmission directions are opposite on the first transmission path, the phase of the second signal received by the first apparatus being a second phase, and the first phase and the second phase are used to adjust the data signal on the first transmission path.

[0214] Based on this technical solution, the phase of a first signal transmitted by a first device on a first transmission path is a first phase, and the phase of a second signal received on the first transmission path is a second phase. The second signal is generated by a second device based on the first signal, and the phase difference between the first phase and the second phase indicates the influence of the two bidirectional transmissions on the phase of the first transmission path, so that the first phase and the second phase can be used to adjust the data signal on the first transmission path, thereby improving the reliability of data signal transmission on the first transmission path.

[0215] For a more detailed description of the processing module 1010 and the transceiver module 1020, please directly refer to the relevant descriptions of the method embodiments shown in Figures 5 to 8. The details will not be described again here.

[0216] When the apparatus 700 is configured to realize the functions of the second device in the embodiment of the method shown in FIG. 5 , the transceiver module 1020 is configured to receive a first signal from the first device, the processing module 1010 is configured to generate a second signal, the first signal and the second signal being used to adjust a data signal of a first transmission path, the transceiver module 1020 is further configured to transmit the second signal, the second signal and the first signal being two signals whose transmission directions are opposite to each other on the first transmission path, and the phase of the second signal transmitted by the transceiver unit is determined based on the phase of the first signal received by the transceiver unit.

[0217] Based on this technical solution, the phase of a first signal transmitted by a first device on a first transmission path is a first phase, and the phase of a second signal received on the first transmission path is a second phase. The second signal is generated by a second device based on the first signal, and the phase difference between the first phase and the second phase indicates the influence of the two bidirectional transmissions on the phase of the first transmission path, so that the first phase and the second phase can be used to adjust the data signal on the first transmission path, thereby improving the reliability of data signal transmission on the first transmission path.

[0218] For a more detailed description of the processing module 1010 and the transceiver module 1020, please directly refer to the relevant description of the embodiment of the method shown in Figure 5. The details will not be described again here.

[0219] 11 , the device 1100 includes a processor 1110 and optionally further includes an interface circuit 1120. The processor 1110 and the interface circuit 1120 are coupled to each other. It may be understood that the interface circuit 1120 may be a transceiver or an input / output interface. Optionally, the device 1100 may further include a memory 1130 for storing instructions executed by the processor 1110, input data required by the processor 1110 to execute the instructions, or data generated after the processor 1110 executes the instructions.

[0220] When the device 1100 is configured to implement the functions of the first device in the method embodiments of Figures 5 and 6, the processor 1110 is configured to implement the functions of the processing module 1010 described above, and the interface circuit 1120 is configured to implement the functions of the transceiver module 1020 described above.

[0221] When the device 1100 is configured to implement the functions of the second device in the method embodiments of Figures 5 and 6, the processor 1110 is configured to implement the functions of the processing unit 1110 described above, and the interface circuit 1120 is configured to implement the functions of the transceiver module 1020 described above.

[0222] It may be understood that the processor in the embodiments of the present application may be a Central Processing Unit (CPU), another general-purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), another programmable logic device, a transistor logic device, a hardware component, or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor, etc.

[0223] In embodiments of the present application, the memory may be a random access memory (RAM), a flash memory, a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a register, a hard disk drive, a removable hard disk drive, a CD-ROM, or any other form of storage medium known in the art. For example, the storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium. Of course, the storage medium may be components of the processor. The processor and the storage medium may be located in an ASIC. In addition, the ASIC may be disposed in a network device or a terminal device. Of course, the processor and the storage medium may alternatively exist as discrete components within the network device or the terminal device.

[0224] All or part of the above-described embodiments may be implemented using software, hardware, firmware, or any combination thereof. When software is used to implement the embodiments, all or part of the embodiments may be realized in the form of a computer program product. The computer program product includes one or more computer programs and instructions. When the computer program or instructions are loaded and executed in a computer, the procedures or functions of the embodiments of the present application are executed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a terminal device, or another programmable device. The computer program or instructions may be stored in or transmitted by a computer-readable storage medium. The computer-readable storage medium may be any available medium accessible by a computer, or a data storage device such as a server incorporating one or more available media. The available medium may be a magnetic medium, such as a floppy disk, hard disk drive, or magnetic tape, an optical medium, such as a DVD, or a semiconductor medium, such as a solid-state disk (SSD).

[0225] In the embodiments of the present application, unless otherwise stated or there is no logical contradiction, the terms and / or descriptions between different embodiments are consistent and can be cross-referenced, and the technical features in different embodiments can be combined based on their internal logical relationships to form new embodiments.

[0226] It should be understood that in the embodiments of the present application, the numerals "first" and "second" etc. are merely used to distinguish between different objects, for example, to distinguish between different network devices, and do not constitute limitations on the scope of the embodiments of the present application. The embodiments of the present application are not limited thereto.

[0227] It should be further understood that in this application, both "when" and "if" mean that the network element performs the corresponding processing in an objective situation, but do not constitute a limitation on time, do not require the network element to have a decision action during implementation, and do not imply any other limitation.

[0228] It should be further understood that in the embodiments of the present application, "B corresponding to A" indicates that B is related to A and B can be determined based on A. However, it should be further understood that determining B based on A does not mean that B is determined based only on A. B may alternatively be determined based on A and / or other information.

[0229] It should also be understood that the term "and / or" in this specification only describes an association relationship for describing associated objects, and represents that three relationships may exist. For example, A and / or B may represent the following three cases: only A exists, both A and B exist, and only B exists. In addition, the symbol " / " in this specification generally indicates an "or" relationship between associated objects.

[0230] It should be further understood that in the embodiments of the present application, "indication" may include direct and indirect indications, or explicit and implicit indications. Information indicated by a specific message (e.g., the following topological information) is called referent information. In a specific implementation process, referent information may be indicated in multiple ways, for example, but not limited to, by directly indicating the referent information, for example, by indicating the referent information or an index of the referent information. Alternatively, referent information may be indicated indirectly by indicating other information, and there is an association relationship between the other information and the referent information. Alternatively, only a portion of the referent information may be indicated, and the other portions of the referent information may be known or pre-agreed upon. For example, specific information may be indicated using a pre-agreed arrangement order of each piece of information, thereby reducing indication overhead to a certain extent.

[0231] Unless otherwise specified, expressions used in this application similar to the expression "an item includes one or more of the following, i.e., one or more of A, B, and C" generally mean that the item can be any one of the following, i.e., A, B, C, A and B, A and C, B and C, A and B and C, A and A, A and A and A, A and A and B, A and A and C, A and B and B, A and C and C, B and B, B and B and B, B and B and C, C and C, C and C and C, and any other combination of A, B, and C. In the above description, three elements A, B, and C are used as examples to explain the optional case of an item. When the expression is "an item includes at least one of the following, i.e., at least one of A, B, ..., and X," in other words, when more elements are included in the expression, the case in which the item is applicable can also be obtained according to the above rules.

[0232] It can be understood that various numbers in the embodiments of the present application are only used for distinction to simplify the description, and are not used to limit the scope of the embodiments of the present application. The order numbers of the above processes do not mean the execution order. The execution order of the processes should be determined based on the functions and internal logic of the processes. [Explanation of symbols]

[0233] 1 signal 2 signals 3 signals 110 Wireless Unit 111 Wireless Unit 111 Baseband Unit 112 Wireless Unit 113 Wireless Unit 114 Wireless Unit 120 Baseband Unit 121 Baseband Unit 122 Baseband Unit 123 Baseband Unit 124 Baseband Unit 520 steps 700 equipment 1000 devices 1010 Processing Module 1020 Transceiver Module 1100 equipment 1110 processor 1110 Processing Unit 1120 Interface Circuit 1130 memory

Claims

1. 1. A communication method, the method being applied to a first device, the method comprising: transmitting a first signal to a second device, the first signal having a first phase; receiving a second signal from the second device, the second signal and the first signal being two signals having opposite transmission directions on a first transmission path, the first signal and the second signal being signals carrying different data, the second signal having a second phase, and the first phase and the second phase being used to adjust a data signal on the first transmission path; A method comprising:

2. The method comprises: transmitting phase information to the second device, the phase information being determined based on the first phase and the second phase, the phase information being used to adjust the data signal; The method of claim 1 further comprising:

3. the phase information indicates a measured phase difference, the measured phase difference being determined based on the first phase and the second phase; or The method of claim 2 , wherein the phase information indicates a varying phase difference, the varying phase difference being determined based on the measured phase difference and a reference phase difference.

4. 4. The method of claim 3, wherein the reference phase difference is a reference phase difference for signal transmission on the first transmission path, or the reference phase difference is a reference phase difference for signal transmission on a second transmission path, the second transmission path being a transmission path different from the first transmission path.

5. 4. The method of claim 3, wherein the phase information indicates a corresponding value of the measured phase difference calculated at at least one frequency, or the phase information indicates a corresponding value of the varying phase difference calculated at the at least one frequency.

6. The method comprises: adjusting the data signal based on the first phase and the second phase; The method of claim 1 further comprising:

7. adjusting the data signal based on the first phase and the second phase, adjusting frequency domain phase information corresponding to the data signal based on the first phase and the second phase; adjusting time-domain phase information corresponding to the data signal based on the first phase and the second phase; or adjusting clock information based on the first phase and the second phase, the clock information being used to transmit the data signal; 7. The method of claim 6, comprising:

8. The step of transmitting phase information to the second device comprises: transmitting the phase information to the second device via a first interface, the first interface being one of the following interfaces: Common Public Radio Interface CPRI or Enhanced Common Public Radio Interface eCPRI; 3. The method of claim 2, comprising:

9. 1. A communication method, the method being applied to a second device, the method comprising: receiving a first signal from a first device; transmitting a second signal to the first device, the second signal and the first signal being two signals with opposite transmission directions on a first transmission path, the first signal and the second signal being signals carrying different data, the phase of the transmitted second signal being determined based on the phase of the received first signal, and the first signal and the second signal being used to adjust the data signal on the first transmission path; A method comprising:

10. The method comprises: receiving phase information from the first device, the phase information being determined based on the first signal and the second signal; adjusting the data signal on the first transmission path based on the phase information; 10. The method of claim 9, further comprising:

11. the phase information indicates a measured phase difference, the measured phase difference being determined based on a first phase of the first signal transmitted by the first device and a second phase of the second signal received by the first device; or The method of claim 10 , wherein the phase information indicates a varying phase difference, the varying phase difference being determined based on the measured phase difference and a reference phase difference.

12. 12. The method of claim 11, wherein the reference phase difference is a reference phase difference for signal transmission on the first transmission path, or the reference phase difference is a reference phase difference for signal transmission on a second transmission path, the second transmission path being a transmission path different from the first transmission path.

13. 12. The method of claim 11, wherein the phase information indicates a corresponding value of the measured phase difference calculated at at least one frequency, or the phase information indicates a corresponding value of the varying phase difference calculated at the at least one frequency.

14. adjusting the data signal on the first transmission path based on the phase information, adjusting frequency domain phase information corresponding to the data signal based on the phase information; adjusting time domain phase information corresponding to the data signal based on the phase information; or adjusting clock information based on the phase information, the clock information being used to transmit the data signal; 11. The method of claim 10, comprising:

15. The step of receiving phase information from the first device comprises: receiving the phase information from the first device via a first interface, the first interface being one of the following interfaces: Common Public Radio Interface CPRI or Enhanced Common Public Radio Interface eCPRI; 10. The method of claim 9, comprising:

16. A communication device comprising modules configured to carry out the method according to any one of claims 1 to 8.

17. A communication device comprising modules configured to carry out the method of any one of claims 9 to 15.

18. 9. A communications device comprising a processor, the processor coupled to a memory, the memory configured to store computer programs or instructions, the processor configured to execute the computer programs or instructions to perform the method of any one of claims 1 to 8.

19. 16. A communications device comprising a processor, the processor coupled to a memory, the memory configured to store computer programs or instructions, the processor configured to execute the computer programs or instructions to perform the method of any one of claims 9 to 15.

20. A computer program comprising instructions, which when executed on a computer, enable the computer to carry out the method according to any one of claims 1 to 8.

21. A computer program comprising instructions, which when executed on a computer, enable the computer to carry out the method according to any one of claims 9 to 15.

22. 9. A computer readable storage medium containing a computer program, which when running on a computer enables the computer to carry out the method of any one of claims 1 to 8.

23. 16. A computer readable storage medium containing a computer program, which when running on a computer enables the computer to carry out the method of any one of claims 9 to 15.

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