CN114930731A

CN114930731A - Transmission mode determination method for power line communication and related device

Info

Publication number: CN114930731A
Application number: CN202080091877.XA
Authority: CN
Inventors: 孔令晓; 钟威; 李华; 潘稻; 白宇冰; 黄丽
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-02-26
Filing date: 2020-02-26
Publication date: 2022-08-19
Anticipated expiration: 2040-02-26
Also published as: WO2021168706A1; CN114930731B

Abstract

The embodiment of the application discloses a method for determining a sending mode of power line communication and a related device, wherein the method comprises the following steps: a sending end sends a first detection frame comprising a first frequency band on a first channel, correspondingly, a receiving end receives the first detection frame on the first channel, and determines a first channel capacity of the first channel in the first frequency band based on the first detection frame; a receiving end acquires a reference bandwidth and determines a first sending mode according to the first channel capacity and the reference bandwidth; the receiving end sends first indication information comprising the first sending mode to the sending end; and after receiving the first indication information, the sending end communicates with the receiving end by adopting the first sending mode. By adopting the embodiment of the application, a 200M SISO mode is added besides a 100M MIMO mode, and mode selection is carried out according to different services and scenes, so that the performance and stability of a PLC system are improved, and system transmission with large bandwidth is realized.

Description

Method for determining transmission mode of power line communication and related device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method for determining a transmission mode of power line communications and a related apparatus.

Background

The Power Line Communication (PLC) is also called power line carrier communication, and is also called a power line network, which refers to a communication method for performing voice or data transmission by using a power line as an information transmission medium. The transmitting end of the PLC technology loads a high-frequency signal carrying information on a current and then transmits the high-frequency signal by using a power line, and the receiving end separates the high-frequency signal from the current and transmits the high-frequency signal to a computer or a telephone to realize information transmission.

The existing PLC technology is 100MHz bandwidth. In order to improve the transmission capability of the PLC, in recent years, based on a Single Input Single Output (SISO) PLC with a bandwidth of 100MHz, a multi-input multi-output (MIMO) PLC that realizes two channels by using a Protection Earth (PE) line is proposed. The maximum system capacity of a MIMO PLC can be doubled for the same bandwidth (here 100MHz) as a SISO PLC, and the memory resources of the chip required for the MIMO PLC are doubled as compared to the SISO PLC.

In the PLC, the influence of power line noise on the channel capacity is reduced with the increase of frequency, and the frequency band above 100MHz is hardly interfered by power line noise (here, noise caused by the change of the operating state or the insertion and extraction of an electric appliance (for example, a brush motor, a switching power supply, a fluorescent lamp, a halogen lamp, or other various household appliances) connected to a line is mainly referred to). Therefore, in the frequency band below 100MHz, due to the change of the operating state of the electrical appliance, the plugging and unplugging of the electrical appliance, and the like, the noise of the power line changes continuously in the whole power line period, and the channel capacity of the power line changes continuously. When the PLC is influenced by a large-interference electric appliance, even PLC equipment is disconnected or networking cannot be performed, and the stability of a PLC system is poor.

Disclosure of Invention

The embodiment of the application provides a method and a related device for determining a sending mode of power line communication, wherein a 200M SISO mode is added besides a 100M MIMO mode, and mode selection is performed according to different services and scenes, so that the performance and stability of a PLC (programmable logic controller) system are improved, and system transmission with large bandwidth is realized.

The present application is described below in terms of various aspects, it being understood that the following embodiments and advantages of the various aspects may be referred to one another.

In a first aspect, an embodiment of the present application provides a method for determining a transmission mode of power line communication, where the method is applied to a receiving end of the power line communication, and the method includes: a sending end sends a first detection frame comprising a first frequency band on a first channel, correspondingly, a receiving end receives the first detection frame on the first channel, and determines a first channel capacity of the first channel in the first frequency band based on the first detection frame; a receiving end acquires a reference bandwidth and determines a first sending mode according to the first channel capacity and the reference bandwidth; the receiving end sends first indication information comprising the first sending mode to the sending end; and after receiving the first indication information, the sending end communicates with the receiving end by adopting the first sending mode.

The two channels are a digital differential channel formed by a live wire and a zero wire and a digital differential channel formed by a live wire and a protective ground wire, and for convenience of description, the two channels are respectively described by a first channel and a second channel. The first channel may be a channel with the minimum target power adjustment value among the 2 channels, and since the target power adjustment value may reflect the attenuation on the channel, the smaller the target power adjustment value is, the smaller the attenuation on the channel is, the first channel is also a channel with small attenuation. The first sending mode is a sending mode which is determined by the receiving end and needs to be adopted by the sending end, and the first indication information is used for indicating the sending end to adopt the first sending mode to communicate with the receiving end. The first indication information may be bandwidth (bandplay) information, and the first indication information may be carried in a frame header of an acknowledgement frame or a link control data unit frame. The first frequency band may be 100MHz-200 MHz.

The receiving end of the embodiment of the application determines the first channel capacity in the first frequency band through the first detection frame, compares the size relationship between the first channel capacity and the reference bandwidth to judge which sending mode the sending end should adopt, and informs the sending end of which sending mode the sending end should adopt for communication, so that mode selection can be performed according to different services and scenes, and the performance and stability of a PLC system are improved.

With reference to the first aspect, in a possible implementation manner, the reference bandwidth is a preset service bandwidth. The receiving end determines a first sending mode according to the first channel capacity and the reference bandwidth, and specifically comprises the following steps: and if the first channel capacity is larger than or equal to the preset service bandwidth, which indicates that the stable and unchangeable first channel capacity meets the stable bandwidth requirement required by the service, determining that the first sending mode determined by the receiving end is a single-input single-output SISO mode of the second frequency band. The second frequency band comprises a first frequency band and a third frequency band, the first frequency band, the second frequency band and the third frequency band are continuous frequency bands, the minimum value in the first frequency band is larger than or equal to the maximum value of the third frequency band, the minimum value in the second frequency band is smaller than or equal to the minimum value of the third frequency band, and the maximum value in the second frequency band is larger than or equal to the maximum value of the first frequency band. Optionally, the second frequency band may be 0-200MHz, the first frequency band may be 100-200 MHz, and the third frequency band may be 0-100 MHz. The preset service bandwidth may be a stable bandwidth set according to different service requirements.

The embodiment of the present application provides a scheme for implementing mode selection according to a service by comparing the size between the channel capacity (i.e., the first channel capacity) in the first frequency band and the preset service bandwidth to select a mode.

With reference to the first aspect, in a possible implementation manner, before the receiving end determines the first channel capacity of the first channel in the first frequency band based on the first sounding frame, the method further includes: the receiving end receives a second detection frame sent by the sending end on a second channel, and receives a third detection frame sent by the sending end on the first channel and a fourth detection frame sent by the second channel at the same time; the receiving end determines a first signal-to-noise ratio of the first channel in a third frequency band based on the first detection frame, determines a second signal-to-noise ratio of the second channel in the third frequency band based on the second detection frame, and determines a third signal-to-noise ratio of two channels formed by the first channel and the second channel in the third frequency band based on the third detection frame and the fourth detection frame; if the first signal-to-noise ratio is greater than or equal to the third signal-to-noise ratio or the second signal-to-noise ratio is greater than or equal to the third signal-to-noise ratio, it is indicated that the system gain of the single channel is better than the system gain of the dual channel at this time, that is, the dual channel cannot provide the system multiplexing gain, and the receiving end determines that the first sending mode is the SISO mode of the second frequency band.

Wherein the transmission time of the first sounding frame is different from the transmission time of the second sounding frame. The second frequency band comprises a first frequency band and a third frequency band, the first frequency band, the second frequency band and the third frequency band are continuous frequency bands, the minimum value in the first frequency band is larger than or equal to the maximum value of the third frequency band, the minimum value in the second frequency band is smaller than or equal to the minimum value of the third frequency band, and the maximum value in the second frequency band is larger than or equal to the maximum value of the first frequency band. Optionally, the second frequency band may be 0 to 200MHz, the first frequency band may be 100MHz to 200MHz, and the third frequency band may be 0 to 100 MHz.

The receiving end of the embodiment of the application respectively determines the signal-to-noise ratio of a single channel (namely, a first signal-to-noise ratio and a second signal-to-noise ratio) and the signal-to-noise ratio of a double channel (namely, a third signal-to-noise ratio) according to different detection frames sent by the sending end, compares the magnitude relation between the signal-to-noise ratio of the single channel and the signal-to-noise ratio of the double channel, uses the single channel for communication when the signal-to-noise ratio of the single channel is larger than or equal to the signal-to-noise ratio of the double channel, namely when the system gain of the single channel is better than the system gain of the double channel, can increase a 200M SISO mode outside a 100M MIMO mode, and realizes the system transmission of large bandwidth.

With reference to the first aspect, in a possible implementation manner, the target power adjustment value of the first channel is smaller than the target power adjustment value of the second channel, which indicates that the attenuation on the first channel is smaller than the attenuation on the second channel. The target power adjustment value of the first channel is determined based on preamble symbols included in the first probe frame, and the target power adjustment value of the second channel is determined based on preamble symbols included in the second probe frame.

With reference to the first aspect, in one possible implementation, the method further includes: and when the first transmission mode is a SISO mode of a second frequency band, the receiving end transmits second indication information to the transmitting end, wherein the second indication information is used for indicating the transmitting end to communicate with the receiving end through the first channel. Optionally, the receiving end may send the second indication information before the receiving end sends the first indication information, or after the receiving end sends the first indication information, the receiving end may also send the first indication information and the second indication information at the same time, which is not limited in this embodiment of the application. The second indication information may be channel information, and the second indication information may be carried in a header of an acknowledgment frame or a link control data unit frame.

After the receiving end determines that the first sending mode is the SISO mode of the second frequency band, the receiving end informs the sending end of adopting the first channel with the minimum attenuation in the two channels for communication, and the performance and the stability of the PLC system can be further improved.

With reference to the first aspect, in one possible implementation, the first indication information is first bandwidth information corresponding to the first transmission mode. Optionally, if the first transmission mode is a 200M SISO mode, the first bandwidth information is 200 MHz; if the first transmission mode is a MIMO mode of 100M, the first bandwidth information is 100 MHz.

With reference to the first aspect, in a possible implementation manner, the reference bandwidth is a preset minimum bandwidth. The receiving end determines a first sending mode according to the first channel capacity and the reference bandwidth, and specifically comprises the following steps: if the first channel capacity is smaller than the preset minimum bandwidth, it indicates that high-frequency (i.e., within 100MHz-200MHz) attenuation is large, and a good high-frequency gain cannot be obtained, and in this case, in an attenuation limited scenario, the first transmission mode determined by the receiving end is a multiple-input multiple-output MIMO mode of the third frequency band. The second frequency band comprises a first frequency band and a third frequency band, the first frequency band, the second frequency band and the third frequency band are continuous frequency bands, the minimum value in the first frequency band is larger than or equal to the maximum value of the third frequency band, the minimum value in the second frequency band is smaller than or equal to the minimum value of the third frequency band, and the maximum value in the second frequency band is larger than or equal to the maximum value of the first frequency band. Optionally, the second frequency band may be 0 to 200MHz, the first frequency band may be 100MHz to 200MHz, and the third frequency band may be 0 to 100 MHz. The preset minimum bandwidth may be a minimum required bandwidth in the first frequency band (100MHz-200MHz) or the second frequency band (0-200 MHz).

The embodiment of the application performs mode selection by comparing the channel capacity (i.e. the first channel capacity) in the first frequency band with the preset minimum bandwidth, and provides a scheme for implementing mode selection according to a scene (attenuation limited scene).

With reference to the first aspect, in a possible implementation manner, the reference bandwidth includes a preset traffic bandwidth and a preset minimum bandwidth. The receiving end determines a first sending mode according to the first channel capacity and the reference bandwidth, and the method specifically comprises the following steps: if the first channel capacity is greater than or equal to the preset minimum bandwidth and the first channel capacity is smaller than the preset service bandwidth, the receiving end determines the second channel capacity of the first channel in the second frequency band based on the first signal-to-noise ratio; the receiving end determines the third channel capacity of the double channels formed by the first channel and the second channel in the third frequency band based on the third signal-to-noise ratio; if the second channel capacity is greater than or equal to the third channel capacity, which indicates that the gain of 100M MIMO is less than the gain of 200M SISO due to noise influence, and a noise-limited scenario is present, the first transmission mode determined by the receiving end is the SISO mode of the second frequency band. Wherein the second frequency band comprises the first frequency band and the third frequency band. Optionally, the second frequency band may be 0-200MHz, the first frequency band may be 100-200 MHz, and the third frequency band may be 0-100 MHz.

When the channel capacity (namely, the first channel capacity) of the receiving end in the first frequency band is greater than the preset minimum bandwidth and less than the preset service bandwidth, the size relationship between the single-channel system capacity (namely, the second channel capacity) and the dual-channel system capacity (namely, the third channel capacity) is further compared, and when the single-channel system capacity is greater than or equal to the dual-channel system capacity, namely, the gain of 100M MIMO is less than the gain of 200M SISO due to noise influence, or in a noise-limited scene, a single channel is used for communication, so that the stability of a PLC system can be improved.

With reference to the first aspect, in one possible implementation, the method further includes: if the second channel capacity is smaller than the third channel capacity and the second channel capacity is greater than or equal to the preset service bandwidth, which indicates that the channel capacity of the first channel in the second frequency band (0-200MHz) can provide the stable bandwidth required by the service, the receiving end determines that the first transmission mode is the SISO mode of the second frequency band.

The receiving end of the embodiment of the application selects a single channel to communicate when the single channel system capacity (namely, the second channel capacity) is smaller than the double channel system capacity (namely, the third channel capacity) and meets the stable bandwidth required by the service, so that the stability of a PLC system can be improved, and the system transmission with large bandwidth can be realized.

With reference to the first aspect, in one possible implementation, the method further includes: if the second channel capacity is smaller than the third channel capacity and/or the preset service bandwidth, which indicates that the channel capacity of the first channel in the second frequency band (0-200MHz) cannot provide the stable bandwidth required by the service, the receiving end determines a second transmission mode, which is an MIMO mode of the third frequency band; and the receiving end sends third indication information to the sending end, wherein the third indication information is used for indicating the sending end to communicate with the receiving end by adopting the second sending mode.

When the single-channel system capacity (namely the second channel capacity) is smaller than the double-channel system capacity (namely the third channel capacity) and the single-channel system capacity does not meet the stable bandwidth required by the service, the receiving end selects to use double channels for communication, and the performance of the PLC system can be ensured.

In a second aspect, an embodiment of the present application provides another method for determining a transmission mode of power line communication, where the method is applied to a receiving end of the power line communication, and the method includes: a sending end sends a first detection frame comprising a first frequency band on a first channel; a sending end receives first indication information; and the sending end communicates with the receiving end by adopting the first sending mode indicated by the first indication information according to the first indication information. Wherein the first sounding frame is used to determine a first channel capacity of the first channel within the first frequency band. The first indication information is used for indicating a first transmission mode, and the first transmission mode is determined according to the first channel capacity and the reference bandwidth.

The two channels are a digital differential channel formed by a live wire and a zero wire and a digital differential channel formed by a live wire and a protective ground wire, and for convenience of description, the two channels are respectively described by a first channel and a second channel. The first channel may be a channel with the smallest target power adjustment value among the 2 channels, and since the target power adjustment value may reflect the attenuation condition on the channel, the smaller the target power adjustment value, the smaller the attenuation on the channel, so the first channel is also a channel with small attenuation. The first sending mode is a sending mode which is determined by the receiving end and needs to be adopted by the sending end, and the first indication information is used for indicating the sending end to adopt the first sending mode to communicate with the receiving end. The first indication information may be bandwidth (bandplan) information, and the first indication information may be carried in a header of an acknowledgement frame or a link control data unit frame. The first frequency band may be 100MHz-200 MHz.

The sending end of the embodiment of the application sends the first detection frame to the receiving end, so that the receiving end determines the first channel capacity in the first frequency band based on the first detection frame, compares the size relation between the first channel capacity and the reference bandwidth to judge which sending mode the sending end should adopt, and informs the sending end of which sending mode to adopt for communication, the sending end adopts the sending mode informed by the receiving end to communicate with the receiving end, mode selection can be carried out according to different services and scenes, and performance and stability of a PLC system are improved.

With reference to the second aspect, in a possible implementation manner, the reference bandwidth is a preset service bandwidth. And when the first channel capacity is greater than or equal to the preset service bandwidth, the stable and unchangeable first channel capacity meets the requirement of the stable bandwidth required by the service, and the first sending mode indicated by the first indication information received by the sending end is a SISO mode of the second frequency band. Wherein the second frequency band comprises the first frequency band and a third frequency band. The second frequency band comprises a first frequency band and a third frequency band, the first frequency band, the second frequency band and the third frequency band are continuous frequency bands, the minimum value in the first frequency band is larger than or equal to the maximum value of the third frequency band, the minimum value in the second frequency band is smaller than or equal to the minimum value of the third frequency band, and the maximum value in the second frequency band is larger than or equal to the maximum value of the first frequency band. Optionally, the second frequency band may be 0 to 200MHz, the first frequency band may be 100MHz to 200MHz, and the third frequency band may be 0 to 100 MHz. The preset service bandwidth may be a stable bandwidth set according to different service requirements.

With reference to the second aspect, in a possible implementation manner, the first probe frame is used to determine a first signal-to-noise ratio of the first channel in a third frequency band. After the transmitting end transmits a first sounding frame including a first frequency band on a first channel, the method further includes: a sending end sends a second detection frame of a second frequency band on a second channel, wherein the second detection frame is used for determining a second signal-to-noise ratio of the second channel in the third frequency band; a sending end simultaneously sends a third detection frame in the third frequency band on the first channel and a fourth detection frame in the third frequency band on the second channel, wherein the third detection frame and the fourth detection frame are used for determining a third signal-to-noise ratio of two channels formed by the first channel and the second channel in the third frequency band; and under the condition that the first signal-to-noise ratio is greater than or equal to the third signal-to-noise ratio or the second signal-to-noise ratio is greater than or equal to the third signal-to-noise ratio, the first sending mode indicated by the first indication information received by the sending end is a SISO mode of the second frequency band.

Wherein the transmission time of the first sounding frame is different from the transmission time of the second sounding frame. The second frequency band comprises the first frequency band and the third frequency band, the first frequency band, the second frequency band and the third frequency band are continuous frequency bands, the minimum value in the first frequency band is larger than or equal to the maximum value of the third frequency band, the minimum value in the second frequency band is smaller than or equal to the minimum value of the third frequency band, and the maximum value in the second frequency band is larger than or equal to the maximum value of the first frequency band. Optionally, the second frequency band may be 0-200MHz, the first frequency band may be 100-200 MHz, and the third frequency band may be 0-100 MHz.

With reference to the second aspect, in one possible implementation manner, the target power adjustment value of the first channel is greater than the target power adjustment value of the second channel, which indicates that the attenuation on the first channel is smaller than the attenuation on the second channel. The target power adjustment value of the first channel is determined based on preamble symbols included in the first probe frame, and the target power adjustment value of the second channel is determined based on preamble symbols included in the second probe frame.

With reference to the second aspect, in one possible implementation, the method further includes: the sending end receives second indication information; and the sending end communicates with the receiving end on the first channel according to the second indication information. The second indication information may be channel information, and the second indication information may be carried in a header of an acknowledgement frame or a link control data unit frame.

With reference to the second aspect, in one possible implementation, the first indication information is first bandwidth information corresponding to the first transmission mode. Optionally, if the first transmission mode is a 200M SISO mode, the first bandwidth information is 200 MHz; if the first transmission mode is a MIMO mode of 100M, the first bandwidth information is 100 MHz.

With reference to the second aspect, in a possible implementation manner, the reference bandwidth is a preset minimum bandwidth. When the first channel capacity is smaller than the preset minimum bandwidth, it is indicated that high-frequency (i.e., within 100MHz-200MHz) attenuation is large, and a good high-frequency gain cannot be obtained, and in this case, an attenuation-limited scenario is obtained, and the first transmission mode indicated by the first indication information received by the transmitting end is a multiple-input multiple-output MIMO mode in the third frequency band. The second frequency band comprises a first frequency band and a third frequency band, the first frequency band, the second frequency band and the third frequency band are continuous frequency bands, the minimum value in the first frequency band is larger than or equal to the maximum value of the third frequency band, the minimum value in the second frequency band is smaller than or equal to the minimum value of the third frequency band, and the maximum value in the second frequency band is larger than or equal to the maximum value of the first frequency band. Optionally, the second frequency band may be 0 to 200MHz, the first frequency band may be 100MHz to 200MHz, and the third frequency band may be 0 to 100 MHz. The preset minimum bandwidth may be a minimum required bandwidth in the first frequency band (100MHz-200MHz) or the second frequency band (0-200 MHz).

With reference to the second aspect, in a possible implementation manner, the first signal-to-noise ratio is used to determine a second channel capacity of the first channel in the second frequency band, and the third signal-to-noise ratio is used to determine a third channel capacity of a dual channel formed by the first channel and the second channel in the third frequency band; when the second channel capacity is greater than or equal to the third channel capacity, it is described that the gain of 100M MIMO is smaller than the gain of 200M SISO due to noise influence, and in this case, the scenario is noise-limited, and the first transmission mode indicated by the first indication information received by the transmitting end is the SISO mode of the second frequency band. The second frequency band includes the first frequency band and the third frequency band. Wherein the second frequency band comprises the first frequency band and the third frequency band. Optionally, the second frequency band may be 0-200MHz, the first frequency band may be 100-200 MHz, and the third frequency band may be 0-100 MHz.

With reference to the second aspect, in a possible implementation manner, when the second channel capacity is smaller than the third channel capacity and is greater than or equal to the preset service bandwidth, the first transmission mode indicated by the first indication information received by the transmitting end is a SISO mode of the second frequency band.

With reference to the second aspect, in one possible embodiment, the method further includes: when the second channel capacity is smaller than the third channel capacity and/or the preset service bandwidth, the sending end receives third indication information, where the third indication information is used to indicate a second sending mode, and the second sending mode is a MIMO mode of the third frequency band; and the sending end communicates with the receiving end by adopting the second sending mode according to the second indication information.

In a third aspect, an embodiment of the present application provides a transmission mode determining apparatus, where the transmission mode determining apparatus includes a unit and/or a module for performing the transmission mode determining method for power line communication provided in the first aspect and/or any one of the possible implementations of the first aspect, so that beneficial effects (or advantages) of the transmission mode determining method for power line communication provided in the first aspect can also be achieved.

In a fourth aspect, embodiments of the present application provide another transmission mode determining apparatus, where the transmission mode determining apparatus includes a unit and/or a module for performing the transmission mode determining method for power line communication provided in the second aspect and/or any one of the possible implementations of the second aspect, so that the beneficial effects (or advantages) of the transmission mode determining method for power line communication provided in the second aspect can also be achieved.

In a fifth aspect, the present application provides a receiving device, which may include a processor, a transceiver, and a memory, where the memory is used to store a computer program, the transceiver is used to transceive various information, probe frames, or data frames, and the computer program includes program instructions that, when executed by the processor, cause the receiving device to execute the method for determining a transmission mode of power line communication according to the first aspect or any one of the possible implementations of the first aspect. The transceiver may be a radio frequency module in the receiving device, or a combination of the radio frequency module and an antenna, or an input/output interface of a chip or a circuit.

In a sixth aspect, the present application provides a transmitting device, which may include a processor, a transceiver, and a memory, where the memory is used to store a computer program, the transceiver is used to transceive various information, probe frames, or data frames, and the computer program includes program instructions that, when executed by the processor, cause the transmitting device to execute the method for determining a transmission mode of power line communication according to the second aspect or any one of the possible implementations of the second aspect. The transceiver may be a radio frequency module in the transmitting device, or a combination of the radio frequency module and an antenna, or an input/output interface of a chip or a circuit.

In a seventh aspect, an embodiment of the present application provides a communication system, including a receiving device and a sending device, where: the receiving apparatus is the transmission mode determining apparatus described in the third aspect or the receiving apparatus described in the fifth aspect, and the transmitting apparatus is the transmission mode determining apparatus described in the fourth aspect or the transmitting apparatus described in the sixth aspect.

In an eighth aspect, an embodiment of the present application provides a computer-readable storage medium, where computer program instructions are stored on the computer-readable storage medium, and when the computer-readable storage medium is run on a computer, the computer is caused to execute the method for determining a transmission mode of power line communication described in the first aspect or any one of the possible implementation manners of the first aspect.

In a ninth aspect, the present application provides another computer-readable storage medium, which stores computer program instructions that, when executed on a computer, cause the computer to execute the method for determining a transmission mode of power line communication described in any one of the second aspect and the possible implementation manner of the second aspect.

In a tenth aspect, an embodiment of the present application provides a program product containing instructions, which when executed, causes the method for determining a transmission mode of power line communication described in the first aspect or any one of the possible implementations of the first aspect to be performed.

In an eleventh aspect, the present application provides a program product containing instructions, which when executed, causes the transmission mode determination method for power line communication described in the second aspect or any one of the possible implementation manners of the second aspect to be executed.

In a twelfth aspect, an embodiment of the present application provides a chip including a processor. The processor is configured to read and execute a program stored in the memory to execute one or more of the first aspect or the second aspect, or a transmission mode determination method for power line communication provided in one or more of any possible implementation manners of the first aspect or the second aspect. Optionally, the chip further comprises a memory, and the memory is connected with the processor through a circuit or a wire. Further optionally, the chip further comprises a communication interface, and the processor is connected to the communication interface. The communication interface is used for receiving data and/or information needing to be processed, and the processor acquires the data and/or information from the communication interface, processes the data and/or information and outputs a processing result through the communication interface. The communication interface may be an input output interface.

Alternatively, the processor and the memory may be physically separate units, or the memory and the processor may be integrated together.

By implementing the embodiment of the application, a 200M SISO mode can be added besides a 100M MIMO mode, and mode selection is carried out according to different services and scenes, so that the performance and stability of a PLC system are improved, and system transmission with large bandwidth is realized.

Drawings

Fig. 1 is a schematic diagram of a physical layer frame format defined by the g.hn standard;

fig. 2 is a system architecture diagram of a power line communication system provided by an embodiment of the present application;

fig. 3 is a schematic flowchart of a transmission mode determination method for power line communication according to an embodiment of the present application;

fig. 4 is a schematic diagram of a first transmission mode determination process provided in an embodiment of the present application;

fig. 5 is a data interaction flow chart of power line communication provided by an embodiment of the present application;

fig. 6 is a schematic structural diagram of a transmission mode determining apparatus according to an embodiment of the present application;

fig. 7 is another schematic structural diagram of a transmission mode determining apparatus according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

In order to better understand the method for determining the transmission mode of power line communication provided in the embodiments of the present application, the following briefly describes the frame format, the signal-to-noise ratio, and the channel capacity provided in the embodiments of the present application:

frame format

The g.hn standard is a set of protocol specifications about power lines (power lines), telephone lines and coaxial cables, and can perform resource integration on existing twisted-pair lines, coaxial cables and power lines to realize unified transmission, thereby significantly reducing installation and operation costs.

Referring to fig. 1, fig. 1 is a schematic diagram of a physical layer frame format defined by the g.hn standard. As shown in fig. 1, the frame format defined by the g.hn standard includes a preamble (preamble), a header (header), a channel estimation (additional channel estimation symbol (ACE symbol)), and one or more payloads (payloads). Wherein the frame header comprises 1 to 2 symbols and the channel estimation comprises 1 to 7 ACE symbols. preamble symbols are used for frame synchronization and adjustment of target power, ACE symbols are used for channel estimation, and payload is used for carrying user data.

Optionally, valid user data is carried on payload of the data frame. The pseudo-random binary sequence is carried on the payload of the sounding frame, and the pseudo-random binary sequence carried on the payload symbol of the sounding frame is used for estimating the signal-to-noise ratio.

The frame format provided by the embodiment of the application is compatible with the physical layer frame format defined by the G.hn standard. In the frame format provided by the embodiment of the application, 2 effective bits are added in a frame header of the frame format defined by the G.hn standard, wherein one effective bit is used for indicating bandwidth (bandplay) information or sending mode information, and the other effective bit is used for indicating channel information.

Second, signal-to-noise ratio (SNR)

Signal-to-noise ratio refers to the ratio of signal to noise in an electronic device or system. The signal refers to an electronic signal from the outside of the device to be processed by the device, the noise refers to an irregular additional signal (or information) which does not exist in the original signal generated after passing through the device, and the additional signal does not change along with the change of the original signal. The measurement unit of the SNR is decibel (dB), and the calculation method satisfies the formula (1-1):

SNR＝10lg(Ps/Pn)，(1-1)

where Ps denotes the effective power of the signal, Pn denotes the effective power of the noise, and lg (x) denotes the base-10 logarithm. In some possible embodiments, the equation (1-1) may also be converted into a voltage amplitude ratio relationship, i.e., SNR is 20lg (Vs/Vn). Vs represents the "effective value" of the signal voltage, and Vn represents the "effective value" of the noise voltage.

Third, channel capacity (channel capacity)

The channel capacity refers to the maximum information rate of the channel for transmitting information without errors, and the unit is bit per second (bit/s) or bit per symbol (bit/symbol). According to a Shannon (Shannon) channel capacity formula, which is called a Shannon formula for short, the channel capacity C satisfies the formula (1-2):

C＝Blog ₂ (1+SNR)，(1-2)

where B denotes the channel bandwidth and SNR denotes the signal-to-noise ratio.

The foregoing briefly explains the frame format, the signal-to-noise ratio, and the channel capacity provided in the embodiments of the present application, and a system architecture of the transmission mode determination method for power line communication provided in the embodiments of the present application will be briefly described below.

The method for determining the transmission mode of the power line communication can be applied to a power line communication system. The power line communication system generally uses the existing power line and socket in a home or office to build a network, connect personal computers, broadband internet access devices, set-top boxes, audio devices, monitoring devices and other intelligent electrical devices, and transmit data, voice or video through the power line.

Referring to fig. 2, fig. 2 is a system architecture diagram of a power line communication system provided in an embodiment of the present application. As shown in fig. 2, the plc system includes at least 2 plc modems (the plc modem 100 and the plc modem 200 of fig. 2). The Modem for power line communication is a Modem (Modem) for broadband internet access through a power line, and is commonly referred to as a Modem. Each of the at least 2 plc modems may be connected via a power line. The power line includes live (L), neutral (N) and Protection Earth (PE), and live and neutral can form a digital differential channel, and live and protection earth can form another digital differential channel. The plc modem 100 and the plc modem 200 may communicate using two channels.

Since power line communication is performed by using a power line as a medium, noise in the power line is an important factor affecting data transmission. A typical noise source of the power line communication system is an electric appliance connected to a line, such as a brush motor, a switching power supply, a fluorescent lamp, a halogen lamp, or other various household appliances. Due to the change of the working state of the electric appliance or the plugging and unplugging of the electric appliance and the like, the noise in the power line can be continuously changed in the whole power line period, so that the channel capacity is continuously changed. When the PLC is influenced by a large-interference electric appliance, the PLC can even be disconnected or cannot be networked. Research shows that the noise on the power line has frequency selectivity, the power line noise interference is large in the frequency range of 0-100MHz, and the frequency range above 100MHz is hardly interfered by the power line noise.

Therefore, an embodiment of the present application provides a method for determining a transmission mode of power line communication, which adds a 200M SISO mode in addition to a 100M MIMO mode, and selects a mode according to different services and scenes, so as to improve performance and stability of a PLC system and implement large-bandwidth system transmission.

In some possible embodiments, the maximum system capacity of a MIMO PLC can be doubled for the same bandwidth as a SISO PLC, which also requires twice as much chip memory resources as a SISO PLC. Based on the dual-channel 100M MIMO PLC mode, the dual-channel storage resources can be spliced to realize the compatible 200M SISO PLC mode, so that the 200M SISO mode is supported under the condition of not increasing a storage chip. The transmitting end and the receiving end provided by the embodiment of the application not only support a 100M MIMO PLC mode, but also support a 200M SISO PLC mode; at the same time, the sending end can only select one mode to communicate with the receiving end.

In some feasible implementations, there are 2 channels between the transmitting end and the receiving end of the embodiment of the present application, which are a digital differential channel formed by the live line and the null line, and a digital differential channel formed by the live line and the protection ground line, respectively. For convenience of description, 2 channels between the transmitting end and the receiving end are described as a first channel and a second channel, respectively.

It is to be understood that the channel mentioned in the embodiments of the present application refers to a power line channel for transmitting data, and for the convenience of distinguishing from a channel in an analog communication system, the embodiments of the present application describe the power line channel for transmitting data by using the channel.

Referring to fig. 3, fig. 3 is a schematic flowchart of a transmission mode determination method for power line communication according to an embodiment of the present disclosure. In the embodiment of the present application, the transmitting end may be the plc modem 100 in fig. 2, and the receiving end may be the plc modem 200 in fig. 2; alternatively, the sending end in this embodiment may be the power line communication modem 200 in fig. 2, and the receiving end may be the power line communication modem 100 in fig. 2, which is not limited in this embodiment. As shown in fig. 3, the transmission mode determination method for power line communication includes, but is not limited to, the following steps:

s101, a sending end sends a first detection frame of a second frequency band on a first channel. Accordingly, the receiving end receives the first sounding frame of the second frequency band on the first channel.

And S102, the sending end sends a second detection frame of a second frequency band on a second channel. Accordingly, the receiving end receives the second sounding frame of the second frequency band on the second channel.

S103, the sending end sends a third detection frame of a third frequency band on the first channel and sends a fourth detection frame of the third frequency band on the second channel at the same time. Accordingly, the receiving end receives the third sounding frame of the third frequency band on the first channel and the fourth sounding frame of the third frequency band on the second channel at the same time.

S104, the receiving end determines a first signal-to-noise ratio of the first channel in the third frequency band based on the first detection frame.

S105, the receiving end determines a second signal-to-noise ratio of the second channel in the third frequency band based on the second detection frame.

S106, the receiving end determines a third signal-to-noise ratio of the two channels formed by the first channel and the second channel in a third frequency band based on the third detection frame and the fourth detection frame.

In some possible embodiments, the second frequency range is 0 to 200MHz, and the third frequency range is 0 to 100 MHz. The second frequency band comprises a first frequency band and a third frequency band, the first frequency band, the second frequency band and the third frequency band are continuous frequency bands, the minimum value of the first frequency band is larger than or equal to the maximum value of the third frequency band, the minimum value of the second frequency band is smaller than or equal to the minimum value of the third frequency band, and the maximum value of the second frequency band is larger than or equal to the maximum value of the first frequency band. The first frequency range is 100MHz to 200 MHz.

In some possible embodiments, the transmitting end transmits the first sounding frame of the second frequency band on the first channel, and does not transmit the sounding frame on the second channel. Accordingly, the receiving end receives the first sounding frame of the second frequency band on the first channel, and does not receive any sounding frame on the second channel. And the receiving end analyzes the received payload (payload) in the first detection frame and estimates a single-stream signal-to-noise ratio (first signal-to-noise ratio) of the first channel in the third frequency band (within 0-100 MHz). Optionally, the first signal-to-noise ratio SNR _{sgl_1} Satisfies the formula (2-1):

wherein N is the total number of subcarriers in the third frequency band (0-100MHz),

the signal-to-noise ratio corresponding to the k-th subcarrier in the N subcarriers on the first channel. The spacing between each of the N subcarriers is 24.414 KHz.

Similarly, the sending end sends the second sounding frame of the second frequency band on the second channel, and does not send the sounding frame on the first channel. Accordingly, the receiving end receives the second sounding frame of the second frequency band on the second channel, and does not receive any sounding frame on the first channel. And the receiving end analyzes the received payload (payload) in the second detection frame and estimates a single-stream signal-to-noise ratio (second signal-to-noise ratio) of the second channel in the third frequency band (within 0-100 MHz). It is to be understood that the transmission time of the first sounding frame is different from that of the second sounding frame.

Optionally, a second signal-to-noise ratio SNR _{sgl_2} Satisfies formula (2-2):

the snr corresponding to the kth subcarrier of the N subcarriers on the second channel. The spacing between each of the N subcarriers is 24.414 KHz.

Similarly, the sending end sends the sounding frame of 100M MIMO on the two channels formed by the first channel and the second channel, that is, sends the third sounding frame of the third frequency band on the first channel and sends the fourth sounding frame of the third frequency band on the second channel at the same time. Accordingly, the receiving end receives the third sounding frame of the third frequency band on the first channel and the fourth sounding frame of the third frequency band on the second channel at the same time. And the receiving end analyzes the payload (payload) in the received third detection frame and the fourth detection frame, and estimates the double-current signal-to-noise ratio (third signal-to-noise ratio) of the double channels in the third frequency band (within 0-100 MHz).

Optionally, a third signal-to-noise ratio SNR _dul Satisfies the formula (2-3):

and the signal-to-noise ratio corresponding to the k-th subcarrier in the N subcarriers on the two channels formed by the first channel and the second channel. The spacing between each of the N subcarriers is 24.414 KHz.

Optionally, the signal-to-noise ratio corresponding to the k-th subcarrier in the N subcarriers on the dual channels

Satisfies the formula (2-4):

wherein the content of the first and second substances,

is the signal-to-noise ratio corresponding to the k-th sub-carrier of the first channel under the MIMO channel,

the signal-to-noise ratio corresponding to the k-th subcarrier of the second channel under the MIMO channel. Due to the crosstalk effect in the MIMO channel, the single-stream SNR of a channel in MIMO mode is not equal to the single-stream SNR of the channel in SISO mode, i.e.

It should be noted that the bandwidth (bandplan) information of the first sounding frame and the second sounding frame is 200M, and the bandwidth information of the third sounding frame and the fourth sounding frame is 100M. Specifically, a header (header) of the probe frame in the embodiment of the present application includes a valid bit for indicating bandplay information and a valid bit for indicating channel information. For example, if the valid bit in the header for indicating the bandplay information is 1, it indicates that the bandplay information is 100M or indicates a 100M MIMO mode; if the valid bit for indicating the bandplay information is 0, it indicates that the bandplay information is 200M or indicates a 200M SISO mode. If the valid bit used for indicating the channel information in the header is 1, the first channel is indicated; and if the effective bit for indicating the channel information is 0, the second channel is represented.

In some possible embodiments, the sending end may send a probe frame (probe frame) periodically, may send the probe frame when the sending end is powered on for the first time, and may trigger the sending end to send the probe frame when the receiving end detects that the signal-to-noise ratio in the channel changes.

S107, if the first signal-to-noise ratio is larger than or equal to the third signal-to-noise ratio or the second signal-to-noise ratio is larger than or equal to the third signal-to-noise ratio, the receiving end determines that the first sending mode is the SISO mode of the second frequency band.

In some possible embodiments, the second frequency range is 0 to 200MHz, the third frequency range is 0 to 100MHz, and the first frequency range is 100MHz to 200 MHz. The second frequency band comprises the first frequency band and the third frequency band, the first frequency band, the second frequency band and the third frequency band are continuous frequency bands, the minimum value of the first frequency band is larger than or equal to the maximum value of the third frequency band, the minimum value of the second frequency band is smaller than or equal to the minimum value of the third frequency band, and the maximum value of the second frequency band is larger than or equal to the maximum value of the first frequency band.

In some possible embodiments, the receiving end obtains the first SNR _{sgl_1} The second SNR _{sgl_2} And the third SNR _dul The first signal-to-noise ratio SNR can then be compared _{sgl_1} Second signal-to-noise ratio SNR _{sgl_2} And the third SNR _dul The magnitude relationship between them. If the first signal-to-noise ratio is greater than or equal to the third signal-to-noise ratio (i.e., SNR) _{sgl_1} ≥SNR _dul ) Or the second signal-to-noise ratio is greater than or equal to the third signal-to-noise ratio (i.e., SNR) _{sgl_2} ≥SNR _dul ) If the system gain (or system capacity, or channel capacity) of the single channel is better than the system gain of the dual channels at this time, that is, the dual channels cannot provide the system multiplexing gain, the receiving end determines to adopt the SISO mode of the second frequency band, that is, the SISO mode of the second frequency band is the first transmission mode. When the system gain of the single channel is better than that of the double channels, the receiving end uses the single channel to carry out communication, and can realize the system transmission with large bandwidth.

In some possible embodiments, if both the first signal-to-noise ratio and the second signal-to-noise ratio are less than the third signal-to-noise ratio (i.e., SNR) _{sgl_1} <SNR _dul And SNR _{sgl_2} <SNR _dul ) At this time, the system gain (or the system capacity, or the channel capacity) of the single channel is worse than the system gain of the dual channels, that is, the dual channels can provide the system multiplexing gain, the receiving end may directly determine to adopt the MIMO mode of the third frequency band, that is, the MIMO mode of the third frequency band is the first transmission mode. If the receiving end determines the first based on the detection frameThe sending mode is the same as the currently adopted sending mode, namely the sending end does not switch the sending mode, and still adopts the current sending mode to communicate with the receiving end. If the first sending mode determined by the receiving end based on the detection frame is different from the currently adopted sending mode, the sending end is switched to the first sending mode from the currently adopted sending mode to communicate with the receiving end.

In some possible embodiments, after the receiving end determines to use the SISO mode of the second frequency band, the receiving end may obtain a preset target power. The receiving end estimates a target power adjustment value of the first channel based on the preamble symbol included in the first probe frame, and may estimate a target power adjustment value of the second channel based on the preamble symbol included in the second probe frame. The receiving end may compare the target power adjustment value of the first channel with the target power adjustment value of the second channel. If the target power adjustment value of the first channel is smaller than the target power adjustment value of the second channel, which indicates that the attenuation on the first channel is smaller than the attenuation on the second channel, the receiving end determines that the transmission channel of the 200M SISO mode is the first channel. If the target power adjustment value of the first channel is greater than the target power adjustment value of the second channel, which indicates that the attenuation on the second channel is less than that on the first channel, the receiving end determines that the transmission channel of the 200M SISO mode is the second channel.

The receiving end returns an Acknowledgement (ACK) frame for each received data frame, and since the sounding frame is a broadcast frame, it is not necessary to return an ACK frame, and information is fed back through a Link Control Data Unit (LCDU) frame. The receiving end may transmit the first indication information and the second indication information to the transmitting end through an ACK frame or an LCDU) frame. The first indication information may be bandwidth information corresponding to a SISO mode of the second frequency band. And the sending end analyzes the received ACK or LCDU frame to obtain the first indication information and the second indication information, and communicates with the receiving end on a first channel indicated by the second indication information by adopting the SISO mode of the second frequency band indicated by the first indication information. Specifically, a header (header) of the ACK or LCDU frame also includes a valid bit for indicating bandplay information and a valid bit for indicating channel information. For convenience of description, an effective bit in the frame header for indicating the bandplay information is referred to as a first bit, and an effective bit in the frame header for indicating the channel information is referred to as a second bit. The receiving end writes the first indication information into the first bit of the ACK frame, writes the second indication information into the second bit of the ACK frame, and sends the ACK frame to the sending end aiming at the received data frame. And the sending end analyzes the frame header of the ACK frame to obtain the first indication information and the second indication information. For example, the first indication information is 0 for indicating the 200M SISO mode, and the second indication information is 1 for indicating that the channel information is the first channel. Or, the receiving end writes the first indication information into a first bit of the LCDU frame, writes the second indication information into a second bit of the LCDU frame, and returns the LCDU frame to the transmitting end for each received probe frame. The sending end analyzes the frame header of the LCDU frame to obtain the first indication information and the second indication information.

If the first indication information analyzed by the sending end is 0 (used for indicating a 200M SISO mode), the sending end determines that the second indication information is valid, that is, the sending end adopts the 200M SISO mode to communicate with the receiving end on a channel indicated by the second indication information. If the first indication information analyzed by the sending end is 1 (used for indicating a 100M MIMO mode), the sending end determines that the second indication information is invalid, which indicates that the sending end defaults to use dual channels, i.e., the sending end adopts the 100M MIMO mode to communicate with the receiving end on the dual channels.

Optionally, before the receiving end sends the first indication information and the second indication information to the sending end through the ACK frame, the receiving end receives a 100M MIMO data frame sent by the sending end on a dual channel formed by the first channel and the second channel, that is, receives the first data frame of the third frequency band on the first channel and receives the second data frame of the third frequency band on the second channel at the same time. The receiving end writes the first indication information into a first bit of the ACK frame, writes the second indication information into a second bit of the ACK frame, and returns the ACK frame to the transmitting end respectively aiming at the first data frame and the second data frame. Wherein, the frame headers of the first data frame and the second data frame comprise a first bit of 1, indicating a 100M MIMO sending mode.

Optionally, the target power adjustment value AGC of the first channel _{sgl_1} Satisfying the formula (2-5), the target power adjustment value AGC of the second channel _{sgl_2} Satisfies the formula (2-6):

AGC _{sgl_1} ＝P _tag /P _{sgl_1} ，(2-5)

AGC _{sgl_2} ＝P _tag /P _{sgl_2} ，(2-6)

wherein, P _tag Is a preset target power, P _{sgl_1} Received signal power, P, of preamble symbols included for a first sounding frame on a first channel _{sgl_2} The received signal power of the preamble symbol included for the second sounding frame on the second channel.

In some possible embodiments, when the transmitting end communicates with the receiving end in the 200M SISO mode on the first channel, the second channel of the two channels formed by the first channel and the second channel remains connected, but does not transmit data.

And S108, if the first signal-to-noise ratio and the second signal-to-noise ratio are both smaller than the third signal-to-noise ratio, the receiving end determines a target power adjustment value of the first channel based on the preamble symbol included in the first detection frame, and determines a target power adjustment value of the second channel based on the preamble symbol included in the second detection frame.

S109, if the target power adjustment value of the first channel is smaller than the target power adjustment value of the second channel, the receiving end determines the first channel capacity of the first channel in the first frequency band based on the first sounding frame.

In some possible embodiments, if the first signal-to-noise ratio and the second signal-to-noise ratio are both less than the third signal-to-noise ratio (i.e., SNR) _{sgl_1} <SNR _dul And SNR _{sgl_2} <SNR _dul ) In this case, the system gain (or system capacity, or channel) of a single channel will be describedCapacity) is worse than the system gain of the dual channels, i.e. the dual channels can provide the system multiplexing gain, but the channel capacity within 100MHz is greatly affected by noise and is unstable, so that it is necessary to further determine which transmission mode is adopted by combining the scene and the service.

Therefore, when the first signal-to-noise ratio and the second signal-to-noise ratio are both smaller than the third signal-to-noise ratio, the receiving end determines the first received signal power on the first channel (i.e., P in formula (2-5)) based on the preamble symbol included in the first probe frame _{sgl_1} ) And determining the second received signal power on the second channel (i.e. P in equation (2-6)) based on the preamble symbol included in the second sounding frame _{sgl_2} ). The receiving end can obtain the preset target power (i.e. P in the formula (2-5) and the formula (2-6)) _tag ) And a ratio between the target power and the first received signal power may be determined as a target power adjustment value for the first channel, and a ratio between the target power and the second received signal power may be determined as a target power adjustment value for the second channel. The receiving end may compare the target power adjustment value of the first channel with the target power adjustment value of the second channel. If the target power adjustment value of the first channel is smaller than the target power adjustment value of the second channel, which indicates that the attenuation on the first channel is smaller than the attenuation on the second channel, the receiving end may analyze the payload (payload) in the received first sounding frame, determine the signal-to-noise ratio of the first channel in the first frequency band (100MHz-200MHz) based on the analysis result, and determine the first channel capacity of the first channel in the first frequency band according to the shannon formula.

If the target power adjustment value of the first channel is greater than the target power adjustment value of the second channel, which indicates that the attenuation on the second channel is less than the attenuation on the first channel, the receiving end may analyze the payload (payload) in the received second sounding frame, determine the signal-to-noise ratio of the second channel in the first frequency band (100MHz-200MHz) based on the analysis result, and determine the first channel capacity of the second channel in the first frequency band according to the shannon formula.

For convenience of description, the embodiments of the present application take the example that the target power adjustment value of the first channel is smaller than the target power adjustment value of the second channel.

Optionally, a first channel capacity C _st Satisfies the formula (2-7):

wherein M is the total number of subcarriers in the first frequency band (100MHz-200MHz),

is the signal-to-noise ratio corresponding to the k-th subcarrier in the M subcarriers in the first channel. The spacing between each of the M subcarriers is 24.414 KHz.

It can be understood that due to the characteristics of the power line noise, the channel capacity in the frequency band of 100MHz-200MHz is not substantially interfered by the change of the working state of the electric appliance or the plugging and unplugging of the electric appliance, and once the networking positions of the transmitting end and the receiving end are determined, the attenuation of the line is stable and unchanged, and then the bandwidth in the frequency band of 100MHz-200MHz is a stable and unchanged bandwidth. I.e. when the line attenuation is stable and constant, the first channel capacity C _st And is also stable and unchanged.

As an alternative embodiment, the sending end sends the first sounding frame of the third frequency band on the first channel, and does not send the sounding frame on the second channel. Accordingly, the receiving end receives the first sounding frame of the third frequency band on the first channel, and does not receive any sounding frame on the second channel. The receiving end estimates a single stream signal-to-noise ratio (first signal-to-noise ratio) of the first channel in the third frequency band based on the first probe frame. The sending end sends the second detection frame of the third frequency band on the second channel, and does not send the detection frame on the first channel. Accordingly, the receiving end receives the second sounding frame of the third frequency band on the second channel, and does not receive any sounding frame on the first channel. And the receiving end estimates a single-stream signal-to-noise ratio (second signal-to-noise ratio) of the second channel in the third frequency band based on the second detection frame. The sending end sends the sounding frame of 100M MIMO on the two channels formed by the first channel and the second channel, that is, sends the third sounding frame of the third frequency band on the first channel and the fourth sounding frame of the third frequency band on the second channel at the same time. Accordingly, the receiving end receives the third sounding frame of the third frequency band on the first channel and the fourth sounding frame of the third frequency band on the second channel at the same time. And the receiving end estimates the double-current signal-to-noise ratio (third signal-to-noise ratio) of the double channels in the third frequency band based on the third detection frame and the fourth detection frame.

If the first signal-to-noise ratio is greater than or equal to the third signal-to-noise ratio or the second signal-to-noise ratio is greater than or equal to the third signal-to-noise ratio, the receiving end determines that the first transmission mode is the SISO mode of the second frequency band. If the first signal-to-noise ratio and the second signal-to-noise ratio are both smaller than the third signal-to-noise ratio, the receiving end determines a target power adjustment value of the first channel based on the preamble symbol included in the first probe frame, and determines a target power adjustment value of the second channel based on the preamble symbol included in the second probe frame. If the target power adjustment value of the first channel is smaller than the target power adjustment value of the second channel, the receiving end may send, to the sending end, indication information for indicating the first channel. And after receiving the indication information indicating the first channel, the transmitting end transmits a fifth sounding frame of the second frequency band on the first channel. Accordingly, the receiving end receives the fifth sounding frame of the second frequency band on the first channel.

The receiving end determines the first channel capacity of the first channel in the first frequency band based on the fifth detection frame. The second frequency band includes the first frequency band and the third frequency band.

S110, the receiving end determines a first sending mode according to the first channel capacity and the reference bandwidth.

In some possible embodiments, the reference bandwidth may include a preset minimum bandwidth. The preset minimum bandwidth may be a minimum required bandwidth in the first frequency band (100MHz-200MHz) or the second frequency band (0-200 MHz). The reference bandwidth may further include a preset service bandwidth. The preset service bandwidth may be a stable bandwidth set according to different service requirements. For example, a normal high definition video requires a stable bandwidth of 10M to 20M, and a 4K (ultra high definition) video requires a stable bandwidth of 40M to 50M.

In some possible embodiments, please refer to fig. 4 together, and fig. 4 is a schematic diagram of a first sending mode determination process provided in the embodiment of the present application. In the above step S110, the determining of the first transmission mode may include the steps of:

s1101, if the first channel capacity is smaller than the preset minimum bandwidth, the receiving end determines that the first transmission mode is the MIMO mode of the third frequency band.

In some possible embodiments, the receiving end may obtain the preset minimum bandwidth C _min And may compare the first channel capacities C _st And the preset minimum bandwidth C _min The magnitude relationship between them. If the first channel capacity is less than the predetermined minimum bandwidth (i.e., C) _st <C _min ) If the attenuation of the high frequency (i.e., within 100MHz-200MHz) is large, and a good high frequency gain cannot be obtained, and the attenuation is limited at this time, the receiving end may determine to adopt the 100M MIMO mode, that is, determine that the first transmission mode is the MIMO mode of the third frequency band.

Optionally, if the first channel capacity is greater than or equal to the preset minimum bandwidth (i.e. C) _st ≥C _min ) If the high frequency gain can be obtained because the high frequency attenuation is small, the receiving end may directly determine to adopt the 200M SISO mode, that is, determine that the first transmission mode is the SISO mode of the second frequency band.

It should be noted that after the receiving end determines the first transmission mode, the mode selection is not performed, that is, the subsequent steps are not performed, such as step S1102-step S1107 are not performed.

S1102, if the first channel capacity is greater than or equal to the preset minimum bandwidth and the first channel capacity is greater than or equal to the preset service bandwidth, the receiving end determines that the first transmission mode is the SISO mode of the second frequency band.

At one endIn some possible embodiments, if the first channel capacity is greater than or equal to the predetermined minimum bandwidth (i.e. C) _st ≥C _min ) Then the receiving end can obtain the preset service bandwidth C _nd And may compare the first channel capacity C _st And the preset service bandwidth C _nd The magnitude relationship between them. If the first channel capacity is greater than or equal to the predetermined traffic bandwidth (i.e., C) _st ≥C _nd ) If the stable and unchangeable first channel capacity meets the stable bandwidth requirement required by the service, the receiving end may determine to adopt the 200M SISO mode, that is, determine that the first transmission mode is the SISO mode of the second frequency band.

Optionally, when the receiving end acquires the preset service bandwidth, the receiving end may identify a service type based on a local area network Switch (LAN Switch, LSW), a Data Link Layer (DLL), and a Physical (PHY) layer, and acquire the preset service bandwidth corresponding to the service type. In one embodiment, LSW coordinates with upper software to identify service packets, adds the service packets into queues with different priorities, schedules the service packets in the queues with different priorities and sends the service packets into DLL for processing; DLL distributes time slots and polling scheduling for different services; the PHY layer distinguishes preset service bandwidth set by the service flow sent by the DLL. For example, if the service type is a normal high-definition video, the service bandwidth is preset to be 10M; if the service type is 4K (ultra high definition) video, the preset service bandwidth is 40M.

Optionally, if the first channel capacity is smaller than the preset service bandwidth (i.e. C) _st <C _nd ) If the stable and unchangeable first channel capacity does not meet the stable bandwidth requirement required by the service, the receiving end may directly determine to adopt the 100M MIMO mode, that is, determine that the first transmission mode is the MIMO mode of the third frequency band.

S1103, if the first channel capacity is greater than or equal to the preset minimum bandwidth and the first channel capacity is smaller than the preset service bandwidth, the receiving end determines a second channel capacity of the first channel in the second frequency band based on the first signal-to-noise ratio.

And S1104, the receiving end determines the third channel capacity of the dual channels in the third frequency band based on the third signal-to-noise ratio.

In some possible embodiments, if the first channel capacity is greater than or equal to the preset minimum bandwidth and the first channel capacity is smaller than the preset traffic bandwidth (i.e. C) _min ≤C _st <C _nd ) Then, the receiving end may calculate the channel capacity corresponding to the first snr (i.e., the channel capacity of the first channel in the third frequency band) according to the shannon formula. The receiving end may determine a sum of the channel capacity corresponding to the first signal-to-noise ratio and the first channel capacity as a second channel capacity of the first channel in the second frequency band (0-200 MHz). The receiving end may calculate a third channel capacity (i.e., a channel capacity of a dual channel formed by the first channel and the second channel in a third frequency band) corresponding to the third snr according to a shannon formula.

Optionally, the first signal-to-noise ratio SNR _{sgl_1} Corresponding channel capacity C _{sgl_1} Satisfying the formula (2-8), third SNR _dul Corresponding third channel capacity C _dul Satisfies the formula (2-9):

wherein N is the total number of subcarriers in the third frequency band (0-100 MHz). The second channel capacity C ₂₀₀ Is a first signal-to-noise ratio SNR _{sgl_1} Corresponding channel capacity C _{sgl_1} And a first channel capacity C _st Sum, i.e. C ₂₀₀ ＝C _{sgl_1} +C _st 。

It is understood that, if the target power adjustment value of the first channel is greater than the target power adjustment value of the second channel, step S1103 may be executedReplacing the steps as follows: if the first channel capacity is greater than or equal to the preset minimum bandwidth and the first channel capacity is smaller than the preset service bandwidth (namely C) _min ≤C _st <C _nd ) Then, the receiving end may calculate the channel capacity corresponding to the second snr (i.e., the channel capacity of the second channel in the third frequency band) according to the shannon formula. The receiving end may determine a sum of the channel capacity corresponding to the second snr and the first channel capacity as a second channel capacity of the second channel in the second frequency band (0-200 MHz). Wherein the second signal-to-noise ratio SNR _{sgl_2} Corresponding channel capacity C _{sgl_2} Satisfies the formula (2-10):

and N is the total number of subcarriers in the third frequency band (0-100 MHz). The second channel capacity C ₂₀₀ Is a second signal-to-noise ratio SNR _{sgl_2} Corresponding channel capacity C _{sgl_2} With a first channel capacity C _st Sum, i.e. C ₂₀₀ ＝C _{sgl_2} +C _st 。

S1105, if the second channel capacity is greater than or equal to the third channel capacity, the receiving end determines that the first transmission mode is the SISO mode of the second frequency band.

In some possible embodiments, after determining the second channel capacity and the third channel capacity, the receiving end may compare the second channel capacity C with each other ₂₀₀ With the third channel capacity C _dul The magnitude relationship between them. If the second channel capacity is greater than or equal to the third channel capacity (i.e., C) ₂₀₀ ≥C _dul ) It is noted that, because of the noise effect, the gain of the 100M MIMO is smaller than the gain of the 200M SISO, and in this case, the noise is limited, the receiving end may determine to adopt the 200M SISO mode, that is, determine that the first transmission mode is the SISO mode of the second frequency band.

Optionally, if the first stepThe two channel capacity is less than the third channel capacity (i.e., C) ₂₀₀ <C _dul ) If the gain of 100M MIMO is greater than that of 200M SISO, the receiving end may directly determine to adopt the 100M MIMO mode, that is, determine that the first transmission mode is the MIMO mode in the third frequency band.

S1106, if the second channel capacity is smaller than the third channel capacity and the second channel capacity is greater than or equal to the preset service bandwidth, the receiving end determines that the first transmission mode is the SISO mode of the second frequency band.

S1107, if the second channel capacity is smaller than the third channel capacity and the second channel capacity is smaller than the preset service bandwidth, the receiving end determines that the second transmission mode is the MIMO mode of the third frequency band.

In some possible embodiments, if the second channel capacity is less than the third channel capacity (i.e., C) ₂₀₀ <C _dul ) The receiving end can compare the second channel capacity C ₂₀₀ And the preset service bandwidth C _nd The magnitude relationship between them. If the second channel capacity is greater than or equal to the predetermined traffic bandwidth (C) ₂₀₀ ≥C _nd ) To illustrate that the channel capacity of the first channel in the second frequency band (0-200MHz) can provide a stable bandwidth required by the service, the receiving end may determine to adopt the 200M SISO mode, i.e., determine that the first transmission mode is the SISO mode of the second frequency band. If the second channel capacity is less than the predetermined traffic bandwidth (C) ₂₀₀ <C _nd ) In this case, the receiving end may determine to adopt a 100M MIMO mode, that is, determine that the second transmission mode is the MIMO mode of the third frequency band (0-200 MHz).

The receiving end judges the scene (such as an attenuation limited scene or a noise limited scene) where the PLC system is located based on the channel capacity of the single channel and/or the double channels, judges whether the channel capacity of the single channel can provide stable bandwidth required by the service or not, selects the sending mode accordingly, can adaptively and flexibly select the sending mode based on the scene and the service, improves the performance and stability of the PLC system, and simultaneously realizes system transmission with large bandwidth.

S111, the receiving end sends the first indication information to the sending end. Accordingly, the transmitting end receives the first indication information.

And S112, the transmitting end communicates with the receiving end by adopting a first transmitting mode according to the first indication information.

In some possible embodiments, the first indication information may be carried in a header of an ACK or LCDU frame. The first indication information may be used to indicate the first transmission mode.

In some possible embodiments, if the first transmission mode indicated by the first indication information is a 100M MIMO mode, the receiving end may transmit the first indication information to the transmitting end through an ACK or LCDU frame. The first indication information is bandwidth information corresponding to a 100M MIMO mode. The sending end analyzes the received ACK or LCDU frame to obtain the first indication information, and can communicate with the receiving end by adopting a 100M MIMO mode on the double channels formed by the first channel and the second channel. Specifically, the receiving end writes the first indication information into a first bit of an ACK or LCDU frame, and sends the ACK or LCDU frame to the sending end. The sending end analyzes the frame header of the ACK or LCDU frame to obtain the first indication information. And the transmitting end communicates with the receiving end by adopting the first transmitting mode indicated by the first indication information on the double channels. For example, the first indication information is 1, which indicates a 100M MIMO mode, and two channels are used by default.

In other possible embodiments, if the first transmission mode indicated by the first indication information is a 200M SISO mode, the receiving end may transmit the first indication information and the second indication information to the transmitting end through an ACK or LCDU frame. The first indication information is bandwidth information corresponding to a 200M SISO mode, and the second indication information is used for indicating a first channel. And the sending terminal analyzes the received ACK or LCDU frame to obtain the first indication information and the second indication information, and communicates with the receiving terminal by adopting the SISO mode of the second frequency band indicated by the first indication information on the first channel indicated by the second indication information. Specifically, the receiving end writes the first indication information into a first bit of the ACK or LCDU frame, writes the second indication information into a second bit of the ACK or LCDU frame, and sends the ACK or LCDU frame to the sending end. The sending end analyzes the frame header of the ACK or LCDU frame to obtain the first indication information and the second indication information. And the sending end communicates with the receiving end by adopting the first sending mode indicated by the first indication information on the channel indicated by the second indication information. For example, the first indication information is 0 for indicating the 200M SISO mode; the second indication information is 1, and is used for indicating that the channel information is the first channel.

In some possible embodiments, after determining the second transmission mode, the receiving end may send the third indication information to the sending end through an ACK or LCDU frame. The third indication information is used to indicate the MIMO mode of the third band. The sending end analyzes the received ACK or LCDU frame to obtain the third indication information, and may communicate with the receiving end in a 100M MIMO mode on the dual channels formed by the first channel and the second channel.

In the embodiment of the application, the receiving end determines the channel capacity of a single channel, a double channel or a single channel at high frequency based on different detection frames sent by the sending end, judges the scene (such as an attenuation limited scene or a noise limited scene) where the PLC system is located based on the channel capacity of the single channel, the double channel or the single channel at high frequency, and judges whether the channel capacity of the single channel can provide stable bandwidth required by a service, so as to select a sending mode. If the sending mode determined by the receiving end is the same as the initial sending mode, the mode switching is not carried out; and if the sending mode determined by the receiving end is different from the initial sending mode, triggering mode switching. According to the embodiment of the application, a 200M SISO mode can be added in addition to a 100M MIMO mode, a sending mode is flexibly selected in a self-adaptive manner based on scenes and services, the performance and the stability of a PLC system are improved, and meanwhile, system transmission with large bandwidth is realized.

As an alternative embodiment, the receiving end may perform block error rate (BLER) and snr estimation based on the data frame sent by the sending end. If the BLER of the PLC system is increased or the SNR changes frequently, which indicates that the interference of a current collector of the PLC system is large at the moment, the receiving end directly determines to adopt a 200M SISO mode. The receiving end may feed back the 200M SISO mode to the transmitting end, and after receiving the 200M SISO mode fed back by the receiving end, the transmitting end may transmit a 200M SISO sounding frame. After receiving the 200M SISO sounding frame, the receiving end estimates the channel capacity based on the 200M SISO sounding frame. The block error rate refers to the percentage of the erroneous code blocks in all the transmitted code blocks.

As another alternative, the child nodes where the sender and the receiver are located may be registered with their corresponding parent nodes. The parent node can monitor the on-line or off-line of the registered child node through a heartbeat mechanism, and can monitor whether the child node is registered successfully or not. If the node where the sending end or the receiving end is located (the physical entity corresponding to the node is the power modem) frequently goes up and down or fails in registration, which indicates that the interference of the power receiver of the PLC system is large at the moment, the receiving end directly determines to adopt the 200M SISO mode. The receiving end may feed back the 200M SISO mode to the transmitting end, and after receiving the 200M SISO mode fed back by the receiving end, the transmitting end may transmit a 200M SISO sounding frame. After receiving the 200M SISO sounding frame, the receiving end estimates the channel capacity based on the 200M SISO sounding frame.

As another alternative embodiment, taking the current transmission mode of the PLC system as a 100M MIMO mode as an example, data interaction between the transmitting end and the receiving end during the power line communication process is described.

Referring to fig. 5, fig. 5 is a data interaction flow chart of power line communication provided by an embodiment of the present application. As shown in FIG. 5, the data interaction flow diagram includes, but is not limited to, the following steps:

and S1, the transmitting end transmits the 100M MIMO data frame on the double channels. Accordingly, the receiving end receives the 100M MIMO data frame.

S2, the receiving end analyzes the frame header of the 100M MIMO data frame to obtain the first bandwidth information.

S3, the receiving end analyzes the payload of the 100M MIMO data frame according to the mode indicated by the first bandwidth information, so as to obtain the first user data carried on the payload of the 100M MIMO data frame.

And S4, the receiving end determines the sending mode.

And S5, if the sending mode determined by the receiving end is different from the current sending mode, the receiving end writes the second bandwidth information of the determined sending mode into the frame header of the ACK or LCDU frame, and writes the channel information into the frame header of the ACK or LCDU frame.

And S6, the receiving end returns an ACK frame or an LCDU frame to the sending end on the double channels. Accordingly, the transmitting end receives the ACK or LCDU frame.

And S7, the sending end analyzes the frame header of the ACK or LCDU frame to obtain second bandwidth information.

And S8, the sending end communicates with the receiving end by adopting the mode indicated by the second bandwidth information on the channel indicated by the communication information.

Wherein, the above-mentioned double channels refer to the first channel and the second channel. The header of the data frame, ACK or LCDU frame includes a valid bit (i.e., a first bit) for indicating bandplay information and a valid bit (i.e., a second bit) for indicating channel information. The first bit in the frame header of the 100M MIMO data frame is 1, which is used for indicating 100M or representing 100M MIMO mode, and two channels are used by default. The first bit in the header of the ACK or LCDU frame is 0, which is used to indicate 200M or indicate 200M SISO mode; the second bit is 1 for indicating the first channel. The first bandwidth information is 100M, and the second bandwidth information is 200M. The channel information is used for indicating the first channel, and the target power adjustment value of the first channel is smaller than that of the second channel.

The step S4 can refer to the method for determining the transmission mode of the power line communication shown in fig. 3, and will not be described herein again.

Optionally, if the receiving end determines the transmission mode based on the probe frame in step S4, step S5-step S7 are: if the sending mode determined by the receiving end is different from the current sending mode, the receiving end writes second bandwidth information of the determined sending mode into a frame header of an LCDU frame, and writes channel information into the frame header of the LCDU frame; the receiving end returns an LCDU frame on a channel (where the channel may be dual channel, or may be a first channel or a second channel) for the received probe frame, and accordingly, the transmitting end receives the LCDU frame; and the sending end analyzes the frame header of the LCDU frame to obtain second bandwidth information. If the receiving end determines the transmission mode based on the BLER or SNR of the 100M MIMO data frame in step S4, step S5-step S7 are: if the sending mode determined by the receiving end is different from the current sending mode, the receiving end writes second bandwidth information of the determined sending mode into a frame header of the ACK frame and writes channel information into the frame header of the ACK frame; the receiving end returns an ACK frame on double channels aiming at the 100M MIMO data frame, and correspondingly, the sending end receives the ACK frame; and the sending end analyzes the frame header of the ACK frame to obtain second bandwidth information.

The step S6 is specifically: and the receiving end respectively sends the ACK or LCDU frame comprising the second bandwidth information on the first channel and the second channel.

The step S8 is specifically: the transmitting end transmits a 200M SISO data frame on the first lane. Accordingly, the receiving end receives the 200M SISO data frame. And the receiving end analyzes the frame header of the 200M SISO data frame to obtain second bandwidth information. And the receiving end analyzes the effective load of the 200M SISO data frame according to the mode indicated by the second bandwidth information to obtain second user data carried on the effective load of the 200M SISO data frame.

Optionally, if the sending mode determined by the receiving end is the same as the current sending mode, the receiving end directly returns an ACK frame on the dual channels for the 100M MIMO data frame, or returns an LCDU frame on the channels for the received probe frame. The first bit in the header of the ACK or LCDU frame is 1, indicating that the current transmission mode is a 100M MIMO mode. The ACK or LCDU frame is used to acknowledge that communication continues using the current transmission mode.

The foregoing describes in detail a transmission mode determining method for power line communication according to an embodiment of the present application, and in order to better implement the foregoing scheme according to the embodiment of the present application, the embodiment of the present application further provides a corresponding apparatus or device.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a transmission mode determining apparatus according to an embodiment of the present application. As shown in fig. 6, the transmission mode determination apparatus 1 may include:

a transceiver module 11, configured to receive a first probe frame sent by a sending end on a first channel; a first determining module 12, configured to determine, based on the first probe frame received by the transceiver module 11, a first channel capacity of the first channel in a first frequency band; a second determining module 13, configured to determine a first sending mode according to the first channel capacity and the reference bandwidth determined by the first determining module 12; the transceiver module 11 is further configured to send first indication information to a sending end, where the first indication information is used to instruct the sending end to communicate with the sending mode determining apparatus 1 in the first sending mode.

There are 2 channels between the transmitting end and the transmitting mode determining apparatus 1, which are respectively a digital differential channel formed by the live wire and the zero wire, and a digital differential channel formed by the live wire and the protective earth wire, and for convenience of description, the channels are respectively described as a first channel and a second channel. The first channel may be a channel with the smallest target power adjustment value among the 2 channels, and since the target power adjustment value may reflect the attenuation condition on the channel, the smaller the target power adjustment value, the smaller the attenuation on the channel, so the first channel is also a channel with small attenuation. The first sending mode is a sending mode that needs to be adopted by the sending end determined by the sending mode determining apparatus 1, and the first indication information is used to instruct the sending end to adopt the first sending mode to communicate with the sending mode determining apparatus 1. The first indication information may be bandwidth (bandplay) information, and the first indication information may be carried in a frame header of an acknowledgement frame or a link control data unit frame. The first frequency band may be 100MHz-200 MHz.

In some possible embodiments, the reference bandwidth is a preset service bandwidth; the second determining module 13 is specifically configured to, when the first channel capacity determined by the first determining module 12 is greater than or equal to the preset service bandwidth, determine that the first sending mode is a single-input single-output SISO mode of a second frequency band, where the second frequency band includes the first frequency band and a third frequency band, the first frequency band, the second frequency band, and the third frequency band are all continuous frequency bands, a minimum value in the first frequency band is greater than or equal to a maximum value in the third frequency band, a minimum value in the second frequency band is less than or equal to a minimum value in the third frequency band, and a maximum value in the second frequency band is greater than or equal to a maximum value in the first frequency band. Optionally, the second frequency band may be 0-200MHz, the first frequency band may be 100-200 MHz, and the third frequency band may be 0-100 MHz. The preset service bandwidth may be a stable bandwidth set according to different service requirements. The preset service bandwidth may be a stable bandwidth set according to different service requirements.

In some possible embodiments, the transmission mode determining apparatus 1 further includes a third determining module 14 and a fourth determining module 15. The transceiver module 11 is further configured to receive a second probe frame sent by the sending end on a second channel, and receive a third probe frame sent by the sending end on the first channel and a fourth probe frame sent by the second channel at the same time, where a sending time of the first probe frame is different from a sending time of the second probe frame; the third determining module 14 is configured to determine a first signal-to-noise ratio of the first channel in a third frequency band based on the first probe frame received by the transceiver module 11, determine a second signal-to-noise ratio of the second channel in the third frequency band based on the second probe frame received by the transceiver module 11, and determine a third signal-to-noise ratio of two channels formed by the first channel and the second channel in the third frequency band based on the third probe frame and the fourth probe frame received by the transceiver module 11; the fourth determining module 15 is configured to determine that the first transmission mode is a SISO mode in the second frequency band when the first signal-to-noise ratio determined by the third determining module 14 is greater than or equal to the third signal-to-noise ratio determined by the third determining module 14 or the second signal-to-noise ratio determined by the third determining module 14 is greater than or equal to the third signal-to-noise ratio. The second frequency band includes the first frequency band and the third frequency band. Optionally, the second frequency band may be 0 to 200MHz, the first frequency band may be 100MHz to 200MHz, and the third frequency band may be 0 to 100 MHz.

In some possible embodiments, the target power adjustment value of the first channel is smaller than the target power adjustment value of the second channel, the target power adjustment value of the first channel is determined based on the preamble symbol included in the first probe frame, and the target power adjustment value of the second channel is determined based on the preamble symbol included in the second probe frame.

In some possible embodiments, the transceiver module 11 is further configured to send second indication information to the sending end, where the second indication information is used to instruct the sending end to communicate with the sending mode determination apparatus 1 through the first channel.

In some possible embodiments, the first indication information is first bandwidth information corresponding to the first transmission mode.

In some possible embodiments, the reference bandwidth is a preset minimum bandwidth. The second determining module 13 is specifically configured to determine that the first sending mode is a multiple-input multiple-output MIMO mode of the third frequency band when the first channel capacity determined by the first determining module 12 is smaller than the preset minimum bandwidth.

In some possible embodiments, the reference bandwidth includes a preset traffic bandwidth and a preset minimum bandwidth. The second determining module 13 includes a first determining unit 131, a second determining unit 132, and a third determining unit 133. The first determining unit 131 is configured to determine, when the first channel capacity is greater than or equal to the preset minimum bandwidth and the first channel capacity is smaller than the preset service bandwidth, a second channel capacity of the first channel in the second frequency band based on the first signal-to-noise ratio; the second determining unit 132 is configured to determine, based on the third signal-to-noise ratio determined by the third determining module 14, a third channel capacity of a dual channel formed by the first channel and the second channel in the third frequency band; the third determining unit 133 is configured to determine that the first transmission mode is the SISO mode of the second frequency band when the second channel capacity determined by the first determining unit 131 is greater than or equal to the third channel capacity determined by the second determining unit 132. The second frequency band includes the first frequency band and the third frequency band. Optionally, the second frequency band may be 0-200MHz, the first frequency band may be 100-200 MHz, and the third frequency band may be 0-100 MHz. The preset service bandwidth may be a stable bandwidth set according to different service requirements.

In some possible embodiments, the third determining unit 133 is further configured to: when the second channel capacity determined by the first determining unit 131 is smaller than the third channel capacity of the second determining unit 132 and the second channel capacity is greater than or equal to the preset service bandwidth, it is determined that the first transmission mode is a SISO mode of the second frequency band.

In some possible embodiments, the transmission mode determining apparatus 1 further includes a fifth determining module 16. The fifth determining module 16 is configured to determine a second sending mode when the second channel capacity determined by the first determining unit 131 is smaller than the third channel capacity and/or the preset service bandwidth determined by the second determining unit 132, where the second sending mode is an MIMO mode of the third frequency band; the transceiver module 11 is further configured to send third indication information to the sending end, where the third indication information is used to instruct the sending end to communicate with the sending mode determining apparatus 1 in the second sending mode.

The first determining module 12, the second determining module 13, the third determining module 14, the fourth determining module 15, and the fifth determining module 16 may be one module: and (5) a processing module.

In specific implementation, implementation of each module or unit may also correspond to corresponding description of the receiving end in the embodiments shown in fig. 3 to fig. 5, and execute the method and the function executed by the receiving end in the embodiments described above.

In this embodiment of the application, the transmission mode determining apparatus 1 determines the channel capacity of a single channel, a dual channel, or a single channel at high frequency based on different probe frames transmitted by a transmitting end, determines a scene (such as an attenuation limited scene or a noise limited scene) where a PLC system is located based on the channel capacity of the single channel, the dual channel, or the single channel at high frequency, and determines whether the channel capacity of the single channel can provide a stable bandwidth required by a service, thereby selecting a transmission mode. A200M SISO mode can be added besides a 100M MIMO mode, a sending mode is flexibly selected in a self-adaptive mode based on scenes and services, the performance and the stability of a PLC system are improved, and meanwhile, the system transmission with large bandwidth is realized.

Referring to fig. 7, fig. 7 is another schematic structural diagram of a transmission mode determining apparatus according to an embodiment of the present application. As shown in fig. 7, the transmission mode determining device 2 may include:

a transceiver module 21, configured to send a first probe frame including a first frequency band on a first channel, where the first probe frame is used to determine a first channel capacity of the first channel in the first frequency band; the transceiver module 21 is further configured to receive first indication information, where the first indication information is used to indicate a first sending mode, and the first sending mode is determined according to the first channel capacity and a reference bandwidth; the communication module 22 is configured to communicate with a receiving end in the first sending mode according to the first indication information received by the transceiver module 21.

For convenience of description, the first channel and the second channel are used for description respectively. The first channel may be a channel with the smallest target power adjustment value among the 2 channels, and since the target power adjustment value may reflect the attenuation condition on the channel, the smaller the target power adjustment value, the smaller the attenuation on the channel, so the first channel is also a channel with small attenuation. The first transmission mode is a transmission mode that the receiving end determines that the transmission mode determining apparatus 2 needs to adopt, and the first indication information is used to indicate the transmission mode determining apparatus 2 to adopt the first transmission mode to communicate with the receiving end. The first indication information may be bandwidth (bandplan) information, and the first indication information may be carried in a header of an acknowledgement frame or a link control data unit frame. The first frequency band may be 100MHz-200 MHz.

In some possible embodiments, the reference bandwidth is a preset traffic bandwidth. When the first channel capacity is greater than or equal to the preset service bandwidth, the first transmission mode indicated by the first indication information received by the transceiver module 21 is a SISO mode of the second frequency band. The second frequency band comprises the first frequency band and a third frequency band, the first frequency band, the second frequency band and the third frequency band are continuous frequency bands, the minimum value in the first frequency band is larger than or equal to the maximum value of the third frequency band, the minimum value in the second frequency band is smaller than or equal to the minimum value of the third frequency band, and the maximum value in the second frequency band is larger than or equal to the maximum value of the first frequency band. Optionally, the second frequency band may be 0-200MHz, the first frequency band may be 100-200 MHz, and the third frequency band may be 0-100 MHz. The preset service bandwidth may be a stable bandwidth set according to different service requirements.

In some possible embodiments, the first probe frame is used to determine a first signal-to-noise ratio of the first channel in the third frequency band. The transceiver module 21 is further configured to send a second sounding frame in a second frequency band on a second channel, where the second sounding frame is used to determine a second signal-to-noise ratio of the second channel in the third frequency band, and a sending time of the first sounding frame is different from a sending time of the second sounding frame; the transceiver module 21 is further configured to simultaneously send a third sounding frame in the third frequency band on the first channel and send a fourth sounding frame in the third frequency band on the second channel, where the third sounding frame and the fourth sounding frame are used to determine a third snr of a dual channel formed by the first channel and the second channel in the third frequency band; when the first snr is greater than or equal to the third snr or the second snr is greater than or equal to the third snr, the first transmission mode indicated by the first indication information received by the transceiver module 21 is a SISO mode of the second frequency band. The second frequency band includes the first frequency band and the third frequency band. Optionally, the second frequency band may be 0 to 200MHz, the first frequency band may be 100MHz to 200MHz, and the third frequency band may be 0 to 100 MHz.

In some possible embodiments, the target power adjustment value of the first channel is greater than the target power adjustment value of the second channel, the target power adjustment value of the first channel is determined based on the preamble symbols included in the first sounding frame, and the target power adjustment value of the second channel is determined based on the preamble symbols included in the second sounding frame.

In some possible embodiments, the transceiver module 21 is further configured to receive a second indication message; the communication module 22 is further configured to communicate with a receiving end on the first channel according to the second indication information.

In some possible embodiments, the reference bandwidth is a preset minimum bandwidth. When the first channel capacity is smaller than the preset minimum bandwidth, the first transmission mode indicated by the first indication information received by the transceiver module 21 is a MIMO mode in a third frequency band.

In some possible embodiments, the first snr is used to determine a second channel capacity of the first channel in the second frequency band, and the third snr is used to determine a third channel capacity of a dual channel formed by the first channel and the second channel in the third frequency band; when the second channel capacity is greater than or equal to the third channel capacity, the first transmission mode indicated by the first indication information received by the transceiver module 21 is a SISO mode of a second frequency band, where the second frequency band includes the first frequency band and the third frequency band.

In some possible embodiments, when the second channel capacity is smaller than the third channel capacity and the second channel capacity is greater than or equal to the predetermined service bandwidth, the first transmission mode indicated by the first indication information received by the transceiver module 21 is a SISO mode of the second frequency band.

In some possible embodiments, the transceiver module 21 is further configured to receive third indication information when the second channel capacity is smaller than the third channel capacity and/or the preset service bandwidth, where the third indication information is used to indicate a second transmission mode, and the second transmission mode is a MIMO mode of the third frequency band; the communication module 22 is further configured to communicate with the receiving end in the second sending mode according to the second indication information.

In specific implementation, implementation of each module or unit may also correspond to corresponding description of the sending end in the embodiments shown in fig. 3 to fig. 5, and execute the method and the function executed by the sending end in the foregoing embodiments.

In this embodiment, the transmission mode determining device 2 transmits a first probe frame to the receiving end, so that the receiving end determines a first channel capacity in a first frequency band based on the first probe frame, and compares a size relationship between the first channel capacity and a reference bandwidth to determine which transmission mode the transmission mode determining device 2 should adopt, and informs the transmission mode determining device 2 of which transmission mode to use for communication, the transmission mode determining device 2 adopts the transmission mode notified by the receiving end to communicate with the receiving end, a 200M SISO mode may be added in addition to the 100M MIMO mode, and mode selection is performed according to different services and scenes, thereby improving performance and stability of the PLC system.

Referring to fig. 8, fig. 8 is a schematic structural diagram of a communication device according to an embodiment of the present disclosure. As shown in fig. 8, a communication device 1000 according to an embodiment of the present disclosure includes a processor 1001, a memory 1002, a transceiver 1003, and a bus system 1004. The communication apparatus provided in the embodiments of the present application may be any one of a receiving device and a transmitting device.

The processor 1001, the memory 1002, and the transceiver 1003 are connected by a bus system 1004.

The memory 1002 stores programs. In particular, the program may include program code including computer operating instructions. The memory 1002 includes, but is not limited to, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), or a portable read-only memory (CD-ROM). Only one memory is shown in fig. 8, but of course, the memory may be provided in plural numbers as needed. The memory 1002 may also be a memory in the processor 1001, which is not limited herein.

The memory 1002 stores elements, executable units or data structures, or subsets thereof, or expanded sets thereof:

and (3) operating instructions: including various operational instructions for performing various operations.

Operating the system: including various system programs for implementing various basic services and for handling hardware-based tasks.

The processor 1001 controls the operation of the communication device 1000, and the processor 1001 may be one or more Central Processing Units (CPUs), and in the case where the processor 1001 is one CPU, the CPU may be a single-core CPU or a multi-core CPU.

In a particular application, the various components of the communications device 1000 are coupled together by a bus system 1004, where the bus system 1004 may include a power bus, a control bus, a status signal bus, etc., in addition to a data bus. For clarity of illustration, however, the various buses are labeled as bus system 1004 in FIG. 8. For ease of illustration, it is only schematically drawn in fig. 8.

Any one of fig. 3 to fig. 5 provided in the foregoing embodiments of the present application, or a method of a receiving end disclosed in each of the foregoing embodiments; or any one of fig. 3 to fig. 5 provided in the foregoing embodiments of the present application, or the method of the transmitting end of each of the foregoing embodiments may be applied to the processor 1001, or implemented by the processor 1001. The processor 1001 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 1001. The processor 1001 may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 1002, and the processor 1001 reads the information in the memory 1002 and, in conjunction with the hardware thereof, performs the method steps of the receiving end described in any one of fig. 3 to 5; or in combination with hardware thereof, perform the method steps of the sender described in any of fig. 3-5.

Embodiments of the present application also provide a computer program product, which includes computer program code to, when run on a computer, cause the computer to execute the method steps of the receiving end described in fig. 3-5; or cause the computer to perform the method steps of the transmitting end described in fig. 3-5, when the computer program code is run on the computer.

The embodiment of the application also provides a device which can be a chip. The chip includes a processor. The processor is configured to read and execute a computer program stored in the memory to perform the transmission mode determination method for power line communication in any possible implementation manner of fig. 3. Optionally, the chip further comprises a memory, and the memory is connected with the processor through a circuit or a wire. Further optionally, the chip further comprises a communication interface, and the processor is connected to the communication interface. The communication interface is used for receiving data and/or information needing to be processed, the processor acquires the data and/or information from the communication interface, processes the data and/or information, and outputs a processing result through the communication interface. The communication interface may be an input output interface.

In another embodiment of the present application, there is also provided a communication system including a receiving device and a transmitting device. For example, the receiving device may be a receiving end in the embodiments shown in fig. 3 to fig. 5, and the sending device may be a sending end in the embodiments shown in fig. 3 to fig. 5.

One of ordinary skill in the art will appreciate that all or part of the processes in the methods of the above embodiments may be implemented by hardware related to instructions of a computer program, which may be stored in a computer-readable storage medium, and when executed, may include the processes of the above method embodiments. And the aforementioned storage medium includes: various media capable of storing program codes, such as ROM or RAM, magnetic or optical disks, etc.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A transmission mode determination method for power line communication, comprising:

a receiving end receives a first detection frame sent by a sending end on a first channel, and determines a first channel capacity of the first channel in a first frequency band based on the first detection frame;

the receiving end determines a first sending mode according to the first channel capacity and the reference bandwidth;

and the receiving terminal sends first indication information to the sending terminal, wherein the first indication information is used for indicating the sending terminal to communicate with the receiving terminal by adopting the first sending mode.
The method of claim 1, wherein the reference bandwidth is a preset traffic bandwidth;

the receiving end determines a first sending mode according to the first channel capacity and the reference bandwidth, and the method comprises the following steps:

if the first channel capacity is greater than or equal to the preset service bandwidth, the first sending mode determined by the receiving end is a single-input single-output (SISO) mode of a second frequency band, and the second frequency band comprises the first frequency band and a third frequency band.
The method according to claim 1 or 2, characterized in that the method further comprises:

the receiving end receives a second detection frame sent by the sending end on a second channel, and receives a third detection frame sent by the sending end on the first channel and a fourth detection frame sent by the sending end on the second channel, wherein the sending time of the first detection frame is different from the sending time of the second detection frame;

the receiving end determines a first signal-to-noise ratio of the first channel in a third frequency band based on the first detection frame, determines a second signal-to-noise ratio of the second channel in the third frequency band based on the second detection frame, and determines a third signal-to-noise ratio of two channels formed by the first channel and the second channel in the third frequency band based on the third detection frame and the fourth detection frame;

if the first signal-to-noise ratio is greater than or equal to the third signal-to-noise ratio, or the second signal-to-noise ratio is greater than or equal to the third signal-to-noise ratio, the receiving end determines that the first transmission mode is a SISO mode of a second frequency band, where the second frequency band includes the first frequency band and the third frequency band.
The method of claim 3, wherein the target power adjustment value of the first channel is smaller than the target power adjustment value of the second channel, and wherein the target power adjustment value of the first channel is determined based on preamble symbols included in the first sounding frame, and wherein the target power adjustment value of the second channel is determined based on preamble symbols included in the second sounding frame.
The method of claim 4, further comprising:

and the receiving end sends second indication information to the sending end, wherein the second indication information is used for indicating the sending end to communicate with the receiving end through the first channel.
The method according to any of claims 1-5, wherein the first indication information is first bandwidth information corresponding to the first transmission mode.
The method of claim 1, wherein the reference bandwidth is a preset minimum bandwidth;

the receiving end determines a first sending mode according to the first channel capacity and a preset reference bandwidth, and the method comprises the following steps:

and if the first channel capacity is smaller than the preset minimum bandwidth, the first sending mode determined by the receiving end is a multiple-input multiple-output (MIMO) mode of a third frequency band.
The method of claim 4, wherein the reference bandwidth comprises a preset traffic bandwidth and a preset minimum bandwidth;

the receiving end determines a first sending mode according to the first channel capacity and the reference bandwidth, and the method comprises the following steps:

if the first channel capacity is greater than or equal to the preset minimum bandwidth and the first channel capacity is smaller than the preset service bandwidth, the receiving end determines a second channel capacity of the first channel in the second frequency band based on the first signal-to-noise ratio;

the receiving end determines a third channel capacity of a double channel formed by the first channel and the second channel in the third frequency band based on the third signal-to-noise ratio;

if the second channel capacity is greater than or equal to the third channel capacity, the first transmission mode determined by the receiving end is a SISO mode of a second frequency band, where the second frequency band includes the first frequency band and the third frequency band.
The method of claim 8, further comprising:

and if the second channel capacity is smaller than the third channel capacity and is greater than or equal to the preset service bandwidth, the receiving end determines that the first sending mode is a SISO mode of a second frequency band.
The method according to claim 8 or 9, characterized in that the method further comprises:

if the second channel capacity is smaller than the third channel capacity and/or the preset service bandwidth, the receiving end determines a second transmission mode, wherein the second transmission mode is an MIMO mode of the third frequency band;

and the receiving end sends third indication information to the sending end, wherein the third indication information is used for indicating the sending end to communicate with the receiving end by adopting the second sending mode.
A transmission mode determination method for power line communication, comprising:

a sending end sends a first detection frame comprising a first frequency band on a first channel, wherein the first detection frame is used for determining the first channel capacity of the first channel in the first frequency band;

the sending end receives first indication information, wherein the first indication information is used for indicating a first sending mode, and the first sending mode is determined according to the first channel capacity and the reference bandwidth;

and the sending end communicates with a receiving end by adopting the first sending mode according to the first indication information.
The method of claim 11, wherein the reference bandwidth is a preset traffic bandwidth;

and under the condition that the capacity of the first channel is greater than or equal to the preset service bandwidth, a first sending mode indicated by the first indication information received by the sending end is a SISO mode of a second frequency band, wherein the second frequency band comprises the first frequency band and a third frequency band.
The method of claim 11 or 12, wherein the first sounding frame is used to determine a first signal-to-noise ratio of the first channel within a third frequency band;

the method further comprises the following steps:

the sending end sends a second detection frame of a second frequency band on a second channel, the second detection frame is used for determining a second signal-to-noise ratio of the second channel in a third frequency band, and the sending time of the first detection frame is different from the sending time of the second detection frame;

the sending end sends a third detection frame in the third frequency band on the first channel and sends a fourth detection frame in the third frequency band on the second channel at the same time, and the third detection frame and the fourth detection frame are used for determining a third signal-to-noise ratio of the two channels formed by the first channel and the second channel in the third frequency band;

and under the condition that the first signal-to-noise ratio is greater than or equal to the third signal-to-noise ratio or the second signal-to-noise ratio is greater than or equal to the third signal-to-noise ratio, a first sending mode indicated by the first indication information received by the sending end is a SISO mode of a second frequency band, and the second frequency band comprises the first frequency band and the third frequency band.
The method of claim 13, wherein the target power adjustment value for the first channel is greater than the target power adjustment value for the second channel, and wherein the target power adjustment value for the first channel is determined based on preamble symbols included in the first sounding frame, and wherein the target power adjustment value for the second channel is determined based on preamble symbols included in the second sounding frame.
The method of claim 14, further comprising:

the sending end receives second indication information;

and the sending end communicates with the receiving end on the first channel according to the second indication information.
The method according to any of claims 11-15, wherein the first indication information is first bandwidth information corresponding to the first transmission mode.
The method of claim 11, wherein the reference bandwidth is a preset minimum bandwidth;

and under the condition that the capacity of the first channel is smaller than the preset minimum bandwidth, the first sending mode indicated by the first indication information received by the sending end is a multi-input multi-output (MIMO) mode of a third frequency band.
The method of claim 14, wherein the first signal-to-noise ratio is used to determine a second channel capacity of the first channel in the second frequency band, and wherein the third signal-to-noise ratio is used to determine a third channel capacity of a dual channel formed by the first channel and the second channel in the third frequency band;

and when the second channel capacity is greater than or equal to the third channel capacity, a first transmission mode indicated by the first indication information received by the transmitting end is a SISO mode of a second frequency band, where the second frequency band includes the first frequency band and the third frequency band.
The method of claim 18, wherein a first transmission mode indicated by the first indication information received by the transmitting end is a SISO mode of a second frequency band when the second channel capacity is smaller than the third channel capacity and the second channel capacity is greater than or equal to the preset service bandwidth.
The method of claim 18 or 19, further comprising:

when the second channel capacity is smaller than the third channel capacity and/or the preset service bandwidth, the sending end receives third indication information, where the third indication information is used to indicate a second sending mode, and the second sending mode is an MIMO mode of the third frequency band;

and the sending end communicates with a receiving end by adopting the second sending mode according to the second indication information.
A transmission mode determination apparatus, comprising:

the receiving and sending module is used for receiving a first detection frame sent by a sending end on a first channel;

a first determining module, configured to determine, based on a first probe frame received by the transceiver module, a first channel capacity of the first channel in a first frequency band;

a second determining module, configured to determine a first sending mode according to the first channel capacity and the reference bandwidth determined by the first determining module;

the transceiver module is further configured to send first indication information to the sending end, where the first indication information is used to indicate that the sending end uses the first sending mode to communicate with the sending mode determining apparatus.
The apparatus of claim 21, wherein the reference bandwidth is a preset traffic bandwidth;

the second determining module is specifically configured to determine that the first sending mode is a single-input single-output SISO mode of a second frequency band when the first channel capacity determined by the first determining module is greater than or equal to the preset service bandwidth, where the second frequency band includes the first frequency band and a third frequency band.
The apparatus according to claim 21 or 22, wherein the transceiver module is further configured to receive a second probe frame sent by the sender on a second channel, and receive a third probe frame sent by the sender on the first channel and a fourth probe frame sent by the sender on the second channel at the same time, where a sending time of the first probe frame is different from a sending time of the second probe frame;

the device further comprises:

a third determining module, configured to determine a first signal-to-noise ratio of the first channel in a third frequency band based on a first probe frame received by the transceiver module, determine a second signal-to-noise ratio of the second channel in the third frequency band based on a second probe frame received by the transceiver module, and determine a third signal-to-noise ratio of a dual channel formed by the first channel and the second channel in the third frequency band based on a third probe frame and a fourth probe frame received by the transceiver module;

a fourth determining module, configured to determine that the first sending mode is a SISO mode of a second frequency band when the first signal-to-noise ratio determined by the third determining module is greater than or equal to the third signal-to-noise ratio determined by the third determining module or the second signal-to-noise ratio determined by the third determining module is greater than or equal to the third signal-to-noise ratio, where the second frequency band includes the first frequency band and the third frequency band.
The apparatus of claim 23, wherein the target power adjustment value for the first channel is less than the target power adjustment value for the second channel, and wherein the target power adjustment value for the first channel is determined based on preamble symbols included in the first sounding frame, and wherein the target power adjustment value for the second channel is determined based on preamble symbols included in the second sounding frame.
The apparatus of claim 24, wherein the transceiver module is further configured to send second indication information to the sender, and the second indication information is used to indicate that the sender communicates with the sending mode determining apparatus through the first channel.
The apparatus according to any of claims 21-25, wherein the first indication information is first bandwidth information corresponding to the first transmission mode.
The apparatus of claim 21, wherein the reference bandwidth is a preset minimum bandwidth;

the second determining module is specifically configured to determine that the first sending mode is a multiple-input multiple-output MIMO mode of a third frequency band when the first channel capacity determined by the first determining module is smaller than the preset minimum bandwidth.
The apparatus of claim 24, wherein the reference bandwidth comprises a preset traffic bandwidth and a preset minimum bandwidth;

the second determining module includes:

a first determining unit, configured to determine, based on the first signal-to-noise ratio, a second channel capacity of the first channel in the second frequency band when the first channel capacity is greater than or equal to the preset minimum bandwidth and the first channel capacity is smaller than the preset service bandwidth;

a second determining unit, configured to determine, based on a third signal-to-noise ratio determined by the third determining module, a third channel capacity of two channels formed by the first channel and the second channel in the third frequency band;

a third determining unit, configured to determine that the first transmission mode is a SISO mode of a second frequency band when the second channel capacity determined by the first determining unit is greater than or equal to the third channel capacity determined by the second determining unit, where the second frequency band includes the first frequency band and the third frequency band.
The apparatus of claim 28, wherein the third determining unit is further configured to:

and when the second channel capacity determined by the first determining unit is smaller than the third channel capacity of the second determining unit and is greater than or equal to the preset service bandwidth, determining that the first transmission mode is a SISO mode of the second frequency band.
The apparatus of claim 28 or 29, further comprising:

a fifth determining module, configured to determine a second sending mode when the second channel capacity determined by the first determining unit is smaller than a third channel capacity and/or the preset service bandwidth determined by the second determining unit, where the second sending mode is an MIMO mode of the third frequency band;

the transceiver module is further configured to send third indication information to the sending end, where the third indication information is used to indicate that the sending end uses the second sending mode to communicate with the sending mode determining apparatus.
A transmission mode determination apparatus, comprising:

a transceiver module, configured to send a first probe frame including a first frequency band on a first channel, where the first probe frame is used to determine a first channel capacity of the first channel in the first frequency band;

the transceiver module is further configured to receive first indication information, where the first indication information is used to indicate a first transmission mode, and the first transmission mode is determined according to the first channel capacity and a reference bandwidth;

and the communication module is used for communicating with a receiving end by adopting the first sending mode according to the first indication information received by the receiving and sending module.
The apparatus of claim 31, wherein the reference bandwidth is a preset traffic bandwidth;

and when the first channel capacity is greater than or equal to the preset service bandwidth, a first transmission mode indicated by the first indication information received by the transceiver module is a SISO mode of a second frequency band, where the second frequency band includes the first frequency band and a third frequency band.
The apparatus of claim 31 or 32, wherein the first sounding frame is configured to determine a first signal-to-noise ratio of the first channel in a third frequency band;

the transceiver module is further configured to send a second sounding frame in a second frequency band on a second channel, where the second sounding frame is used to determine a second signal-to-noise ratio of the second channel in the third frequency band, and a sending time of the first sounding frame is different from a sending time of the second sounding frame;

the transceiver module is further configured to simultaneously transmit a third sounding frame in the third frequency band on the first channel and a fourth sounding frame in the third frequency band on the second channel, where the third sounding frame and the fourth sounding frame are used to determine a third signal-to-noise ratio of a dual channel formed by the first channel and the second channel in the third frequency band;

when the first signal-to-noise ratio is greater than or equal to the third signal-to-noise ratio or the second signal-to-noise ratio is greater than or equal to the third signal-to-noise ratio, a first transmission mode indicated by the first indication information received by the transceiver module is a SISO mode of a second frequency band, where the second frequency band includes the first frequency band and the third frequency band.
The apparatus of claim 33, wherein the target power adjustment value for the first channel is greater than the target power adjustment value for the second channel, and wherein the target power adjustment value for the first channel is determined based on preamble symbols included in the first sounding frame and the target power adjustment value for the second channel is determined based on preamble symbols included in the second sounding frame.
The apparatus of claim 34, wherein the transceiver module is further configured to receive a second indication message;

the communication module is further configured to communicate with the receiving end on the first channel according to the second indication information.
The apparatus according to any of claims 31-35, wherein the first indication information is first bandwidth information corresponding to the first transmission mode.
The apparatus of claim 31, wherein the reference bandwidth is a preset minimum bandwidth;

and under the condition that the first channel capacity is smaller than the preset minimum bandwidth, the first sending mode indicated by the first indication information received by the transceiver module is a multiple-input multiple-output (MIMO) mode of a third frequency band.
The apparatus of claim 34, wherein the first signal-to-noise ratio is configured to determine a second channel capacity of the first channel in the second frequency band, and wherein the third signal-to-noise ratio is configured to determine a third channel capacity of a dual channel formed by the first channel and the second channel in the third frequency band;

when the second channel capacity is greater than or equal to the third channel capacity, the first transmission mode indicated by the first indication information received by the transceiver module is a SISO mode of a second frequency band, where the second frequency band includes the first frequency band and the third frequency band.
The apparatus of claim 38, wherein if the second channel capacity is smaller than the third channel capacity and the second channel capacity is greater than or equal to the preset traffic bandwidth, the first transmission mode indicated by the first indication information received by the transceiver module is SISO mode of the second frequency band.
The apparatus of claim 38 or 39, wherein the transceiver module is further configured to receive third indication information when the second channel capacity is smaller than the third channel capacity and/or the preset traffic bandwidth, where the third indication information is used to indicate a second transmission mode, and the second transmission mode is a MIMO mode of the third frequency band;

the communication module is further configured to communicate with a receiving end in the second sending mode according to the second indication information.
A receiving device comprising a processor, a transceiver and a memory, wherein the memory is configured to store a computer program comprising program instructions that, when executed by the processor, cause the receiving device to perform the method of any one of claims 1-10.
A transmitting device comprising a processor, a transceiver, and a memory, wherein the memory is configured to store a computer program comprising program instructions that, when executed by the processor, cause the transmitting device to perform the method of any of claims 11-20.
A communication system comprising a receiving device and a transmitting device, wherein:

the receiving device is the apparatus of any one of claims 21-30;

the transmitting device is the apparatus of any one of claims 31-40.
A computer-readable storage medium, having stored therein computer program instructions, which when run on the computer, cause the computer to perform the method of any one of claims 1-10.
A computer-readable storage medium, having stored therein computer program instructions which, when run on the computer, cause the computer to perform the method of any one of claims 11-20.