Power control method and device for visible light communication

Abstract

The embodiment of the invention discloses a power control method and device for visible light communication. The method is applied to sending equipment. The method comprises the following steps: determining a target power mode in at least one power mode for visible light communication according to uplink and downlink time slot configuration information and a synchronization signal block (SSB) configuration period; adjusting the sending power of an optical signal according to the power configuration information corresponding to the target power mode; wherein the power configuration information corresponding to each power mode in the at least one power mode is used for adjusting the sending power of the optical signal to a preset range of power fluctuation; the preset range is determined according to a frequency threshold value and / or a depth threshold value of power fluctuation.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technologies, and in particular, to a method and device for power control of visible light communication. Background Art

[0002] Light source flicker has an important impact on human health. For example, some short-term visible flickers (usually in the range of 3 Hertz (Hz) to 70 Hz) can cause health problems such as epilepsy, and some flickers with frequencies higher than the perceivable frequency may cause health problems such as vision loss and headaches.

[0003] Visible light communication uses high-speed bright and dark flicker signals that can be seen by the naked eye emitted by fluorescent lamps or light-emitting diodes, etc. to transmit information. Compared with wireless local area networks, visible light communication systems can use indoor lighting equipment to replace wireless local area network base stations to transmit signals, and simultaneously achieve the dual functions of lighting and communication. According to the configuration of the physical layer of the fifth-generation mobile communication technology (5G, 5th Generation Mobile Communication Technology), there will be power differences between different downlink signals, between uplink time slots or symbols and downlink time slots or symbols, and between the time slots or symbols called and the time slots or symbols not called in the downlink time slots. These power differences may cause health hazards due to the light source flicker in visible light communication. Therefore, when performing visible light communication based on the 5G communication standard, it is necessary to consider how to avoid the problem of light stroboscopic caused by power fluctuations. Summary of the Invention

[0004] To solve the existing technical problems, embodiments of the present invention provide a method and device for power control of visible light communication.

[0005] To achieve the above object, the technical solution of the embodiments of the present invention is realized as follows:

[0006] In a first aspect, embodiments of the present invention provide a method for power control of visible light communication, which is applied to a sending device; the method includes:

[0007] Determine a target power mode in at least one power mode for visible light communication according to the uplink and downlink time slot configuration information and the synchronization signal block (SSB, Synchronization Signal / PBCH Block) configuration period;

[0008] Adjust the transmission power of the optical signal according to the power configuration information corresponding to the target power mode;

[0009] Wherein, the power configuration information corresponding to each power mode in the at least one power mode is used to adjust the transmission power of the optical signal to a preset range of power fluctuations; the preset range is determined according to the frequency threshold and / or depth threshold of power fluctuations.

[0010] In the above solution, the uplink and downlink time slot configuration information includes the number of time slot patterns corresponding to the uplink and downlink time slot ratio and the period of each time slot pattern; the sum of the periods of each time slot pattern is the uplink and downlink time slot ratio period; determining the target power mode in at least one power mode for visible light communication according to the uplink and downlink time slot configuration information and the SSB configuration period includes: when the uplink and downlink time slot configuration information and the SSB configuration period meet the first condition, determining that the target power mode is the first power mode; wherein, the first condition at least includes: the SSB configuration period is an integer multiple of the uplink and downlink time slot ratio period, and the SSB configuration period is less than or equal to the reciprocal of the frequency threshold.

[0011] In the above solution, adjusting the transmission power of the optical signal according to the power configuration information corresponding to the target power mode includes: when it is determined that the target power mode is the first power mode, adjusting the first transmission power of the SSB to the transmission power of the secondary synchronization signal SSS, and adjusting the transmission powers of multiple downlink signals, and the transmission power of each adjusted downlink signal is less than the first transmission power; adjusting the transmission power of the first time period to 0; the first time period includes the uplink time slot or symbol within the uplink and downlink time slot ratio period and the flexible time slot or symbol adjacent to the uplink time slot or symbol.

[0012] In the above solution, determining the target power mode in at least one power mode for visible light communication according to the uplink and downlink time slot configuration information and the SSB configuration period includes: when the uplink and downlink time slot configuration information and the SSB configuration period do not meet the first condition but meet the second condition, determining that the target power mode is the second power mode; wherein, the second condition at least includes: the sum of the periods of two consecutive time slot patterns is less than or equal to the reciprocal of the frequency threshold.

[0013] In the above solution, adjusting the transmission power of the optical signal according to the power configuration information corresponding to the target power mode includes: when it is determined that the target power mode is the second power mode, adjusting the transmission power of the second time period to the maximum transmission power of the downlink signal, wherein the second time period includes the uplink time slot or symbol within the period of the first time slot pattern in two consecutive time slot patterns and the flexible time slot or symbol adjacent to the uplink time slot or symbol; adjusting the transmission powers of the third time period and the fourth time period to 0; wherein, the third time period includes the uplink time slot or symbol within the period of the second time slot pattern in two consecutive time slot patterns and the flexible time slot or symbol adjacent to the uplink time slot or symbol, and the fourth time period includes the time slot or symbol in the downlink time slot or symbol that is not called.

[0014] In the above solution, determining the target power mode from at least one power mode for visible light communication according to the uplink and downlink time slot configuration information and the SSB configuration period includes: when the uplink and downlink time slot configuration information and the SSB configuration period do not meet the first condition and do not meet the second condition, determining that the target power mode is the third power mode.

[0015] In the above solution, adjusting the transmission power of the optical signal according to the power configuration information corresponding to the target power mode includes: when it is determined that the target power mode is the third power mode, obtaining the maximum transmission power of the downlink signal, and determining the second transmission power according to the maximum transmission power and the depth threshold; adjusting the transmission power in the fifth time period to the second transmission power; wherein, the fifth time period includes unused time slots or symbols in the downlink time slot or symbol, the uplink time slot or symbol, and flexible time slots or symbols adjacent to the uplink time slot or symbol.

[0016] In the above solution, the multiple downlink signals at least include a Channel State Information-Reference Signal (CSI-RS), a DeModulation-Reference Signal (DM-RS), and a Physical Downlink Shared Channel (PDSCH); adjusting the transmission power of the multiple downlink signals includes: adjusting the transmission power of each downlink signal based on the power offset parameter corresponding to each downlink signal.

[0017] In a second aspect, an embodiment of the present invention provides a power control device for visible light communication, which is applied to a transmitting device; the device includes a mode determination module and a power adjustment module; wherein,

[0018] The mode determination module is configured to determine a target power mode from at least one power mode for visible light communication according to the uplink and downlink time slot configuration information and the SSB configuration period;

[0019] The power adjustment module is configured to adjust the transmission power of the optical signal according to the power configuration information corresponding to the target power mode;

[0020] Wherein, the power configuration information corresponding to each power mode in the at least one power mode is used to adjust the transmission power of the optical signal to a preset range of power fluctuations; the preset range is determined according to the frequency threshold and / or depth threshold of the power fluctuations.

[0021] In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the steps of the above-mentioned power control method for visible light communication are implemented.

[0022] In a fourth aspect, an embodiment of the present invention provides a transmitting device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the steps of the above-mentioned power control method for visible light communication are implemented.

[0023] The power control method and device for visible light communication provided by the embodiments of the present invention can pre-configure power configuration information corresponding to at least one power mode. The power configuration information corresponding to each power mode can adjust the transmission power of the optical signal to a preset range that meets the power fluctuation specification. When specifically performing power control, the target power mode can be determined from the at least one power mode according to the uplink time slot configuration information and the SSB configuration period of the visible light communication, and the transmission power of the optical signal can be adjusted according to the power configuration information of the target power mode. Thus, for various stroboscopic problems that may occur in visible light communication, different power configuration information is used to adjust the lighting power and transmission power in visible light communication, avoiding the problem that the light source fluctuation caused by visible light communication does not meet the specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram for comparing the signal amplitude in 5G communication with the signal amplitude in visible light communication in the related art;

[0025] Figure 2 It is a schematic diagram of semi-static configuration of time slot ratio in the related art;

[0026] Figure 3 It is a schematic diagram of dynamic configuration of time slot ratio in the related art;

[0027] Figure 4 It is a schematic diagram of the power difference between the called time slot or symbol and the non-called time slot or symbol in the related art;

[0028] Figure 5 It is a schematic flowchart of the power control method for visible light communication according to the embodiment of the present invention;

[0029] Figure 6 It is a schematic diagram of the power fluctuation period according to the embodiment of the present invention;

[0030] Figure 7 It is a schematic diagram of the light source power fluctuation requirement according to the embodiment of the present invention;

[0031] Figure 8 It is a schematic diagram of the power fluctuation of the first power mode according to the embodiment of the present invention;

[0032] Figure 9 Schematic diagram of power fluctuation in the second power mode of the embodiment of the present invention;

[0033] Figure 10 Schematic diagram of power fluctuation in the third power mode of the embodiment of the present invention;

[0034] Figure 11 Flowchart of an application example of the power control method for visible light communication in the embodiment of the present invention;

[0035] Figure 12 Schematic diagram of the composition structure of the power control device for visible light communication in the embodiment of the present invention;

[0036] Figure 13 Schematic diagram of the structure of the transmitting device in the embodiment of the present invention. Detailed implementation manners

[0037] Before elaborating on the power control method for visible light communication in the embodiment of the present invention in detail, a brief description of light source flicker in related technologies is first given.

[0038] Light source flicker has an important impact on human health. For example, some briefly visible flickers (usually in the range of 3 Hz to 70 Hz) can cause epilepsy, and there are also some flickers with frequencies higher than the human-perceivable frequency, which can cause health problems such as vision decline and headache.

[0039] Table 1

[0040] Fluctuation frequency f Fluctuation depth FPF limit / % f ≤ 9 Hz FPF ≤ 0.288 9 Hz ≤ f ≤ 3125 Hz FPF ≤ f × 0.08 / 2.5 f > 3125 Hz Unrestricted

[0041] Table 1 shows the regulations on the depth of light source fluctuation in the national standard GB / T 31831-2015. In Table 1, the depth of fluctuation FPF = 100% × (A - B) / (A + B), where A is the maximum light output within a fluctuation period, and B is the minimum light output within a fluctuation period.

[0042] As can be seen from Table 1, for the stroboscopic effect of the light source, two key parameters mainly need to be controlled, namely the fluctuation range of power (related to the fluctuation depth) and the fluctuation period of power (related to the frequency). When the fluctuation frequency is greater than 3125 Hz (i.e., the time length is shorter than 320 microseconds μs), the fluctuation depth of the wave power does not need to be considered. According to the frame structure configuration of the 5G communication standard in the related technology, when the subcarrier spacing is from 15 kilohertz (kHz) to 240 kHz, the time length of the symbol is between 8.92 μs and 71.35 μs, and this fluctuation time length is less than the aforementioned 320 μs. Therefore, the voltage fluctuations of different symbols can be ignored; the time length of the slot is between 62.5 μs and 1 millisecond (ms). Among them, when the subcarrier bandwidth is less than or equal to 30 kHz, the time length of its slot is greater than 320 μs. At this time, if there is optical power fluctuation between different slots, the resulting stroboscopic effect cannot be ignored. Applied to visible light communication, when the communication frequency rises to the visible light band, due to the reduction in the number of multipaths and the increase in Doppler frequency shift, there is a possibility that the subcarrier spacing will be further expanded, and there may be non-compliant optical power fluctuations between slots or symbols.

[0043] Under the 5G communication standard, the downlink power fluctuations of visible light communication mainly come from the following situations:

[0044] One is due to different power settings between the transmitted signals. In 5G communication, the downlink power adopts a static allocation method. The downlink signals can include SSB, CSI-RS, DM-RS, PDSCH, etc. These signals will be set with different power biases by the higher layer when transmitted. The transmission opportunities (such as symbols) corresponding to these signals often exist on certain specific orthogonal frequency division multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) symbols and do not continuously occupy the entire slot.

[0045] Specifically, the power (EPRE, Energy Per Resource Element) of each resource block of the secondary synchronization signal (SSS, Secondary Synchronization Signal), physical broadcast channel (PBCH, Physical Broadcast Channel), and the DM-RS signal in PBCH in SSB is considered to be the same and is determined by the higher layer signaling parameter SS-PBCH-BlockPower. However, the EPRE of the primary synchronization signal (PSS, Primary Synchronization Signal) may have a power deviation of 0 or 3 decibels (dB) from that of SSS.

[0046] The power offset of CSI-RS is controlled by the high-layer signaling parameter powerControlOffsetSS, which represents the power offset between CSI-RS and the EPRE of PBCH in SSB, and its value is one of -3dB, 0dB, 3dB, and 6dB.

[0047] The power offset of PDSCH is controlled by the high-layer signaling parameter powerControlOffset, which represents the power offset between the EPRE of PDSCH and that of non-zero CSI-RS, and its value is an integer between -8dB and 15dB.

[0048] The power offset of DM-RS is set according to the number of "DM-RS code division multiplexing (CDM) groups without data". When the numbers of "DM-RS CDM groups without data" are 1, 2, and 3 respectively, the power offsets of DM-RS are automatically adjusted to 0dB, -3dB, and -4.77dB respectively.

[0049] The second is due to the power gap between the uplink and downlink time slots or symbols. Figure 1 It is a schematic diagram for comparing the signal amplitudes in 5G communication and visible light communication in the related art. As Figure 1 shown in the upper half, in the 5G system, the downlink signal is a radio frequency signal formed by up-converting the baseband signal, all of which are AC signals; while in the visible light communication system, since visible light can only be driven by a positive voltage (or positive current), a DC signal needs to be added as a bias. As Figure 1 shown in the lower half, the overall power of the downlink communication signal in visible light communication will be increased. When in the uplink time slot, if the AC signal is directly removed and only the DC bias signal is retained, the difference between the power of the DC signal and the power of the AC signal will form the stroboscopic effect of the light source.

[0050] Specifically, the time slot ratio of 5G communication is mainly divided into semi-static configuration and dynamic configuration. Figure 2 It is a schematic diagram of the semi-static configuration of the time slot ratio in the related art. Figure 3 It is a schematic diagram of the dynamic configuration of the time slot ratio in the related art. Refer to Figure 2 and Figure 3 In the semi-static configuration mode, it can be configured through the parameter tdd-UL-DL-ConfigurationCommon in the cell message sent to the User Equipment (UE), as Figure 2As shown in the figure, after the downlink time slot, a part of the downlink symbols is set by the parameter nrofDownlinkSymbols, and before the uplink time slot, a part of the uplink symbols is set by the parameter nrofUplinkSymbols. The downlink symbols are in the front part of the entire time slot, and the uplink symbols are in the rear part of the entire time slot. Among them, the maximum values of the parameters nrofDownlinkSymbols and nrofUplinkSymbols are both 13. For example, when the subcarrier spacing is 30 kHz, the maximum power fluctuation period (0.5 ms) is reached, which has exceeded the 320 μs required by the light source stroboscopic. For the UE-level dedicated indication time slot, it is indicated by the parameter tdd-UL-DL-ConfigurationDedicated, and it can only be configured on the flexible time slot configured by the cell.

[0051] As Figure 3 shown, after the high layer indicates the SlotFormatIndicator, the dynamic configuration can determine the uplink and downlink symbol ratios of different time slots according to the provisions in the downlink control information (DCI, Downlink Control Information) format 2_0 and the relevant communication protocols. Refer to Figure 3 , the dynamic configuration of the time slot ratio can only be applied to the flexible time slot after two levels of semi-static time slot ratio configuration.

[0052] Thirdly, it is due to the power difference between the called time slot or symbol and the non-called time slot or symbol. Figure 4 It is a schematic diagram of the power difference between the called time slot or symbol and the non-called time slot or symbol in the related technology. As Figure 4 shown, although the uplink and downlink time slots have been allocated, not all downlink time slots will be called. When the downlink time slot or symbol is not called, there will be a certain DC bias power or no DC bias remaining in this time slot or symbol, which will cause stroboscopic in the downlink time slot.

[0053] That is to say, the power biases of different downlink signals are different, such as the power of the data units in SSB, DM-RS, CSI-RS, and PDSCH; the power in the uplink time slot or symbol is different from that in the downlink time slot or symbol. When visible light is used for downlink transmission, there is no power output from the visible light source in the uplink time slot, and in the relevant communication standards, when setting the uplink and downlink time slot or symbol ratios, two methods of semi-static allocation at the cell level and dynamic allocation at the user level according to DCI are adopted, but the stroboscopic requirements are not considered during the allocation; there are called and non-called time slots or symbols in the downlink time slot. When this time slot or symbol is not called, the power decreases, which will form a power difference and cause stroboscopic.

[0054] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are part of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work fall within the scope of protection of the present invention.

[0055] In the description of the present invention, it should be noted that the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. These terms are only used to distinguish one element (or threshold or application or instruction or operation) from another element (or threshold or application or instruction or operation). For example, the first operation can be called the second operation, and the second operation can also be called the first operation without departing from the scope of the present invention. The first operation and the second operation are both operations, but they are not the same operation.

[0056] The term "and / or" in the embodiments of the present invention refers to any and all possible combinations including one or more of the associated listed items. It should also be noted that when used in this specification, "including / containing" specifies the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, and / or components and / or their groups.

[0057] The steps in the embodiments of the present invention do not necessarily need to be processed in the order described. The steps can be shuffled and rearranged as required, or the steps in the embodiments can be deleted, or steps can be added to the embodiments. The step descriptions in the embodiments of the present invention are only optional order combinations and do not represent all possible order combinations of the steps in the embodiments of the present invention. The step order in the embodiments cannot be considered a limitation on the present invention.

[0058] The embodiments of the present invention provide a power control method for visible light communication, and the method is applied to a sending device. Figure 5 It is a schematic flowchart of the power control method for visible light communication according to the embodiments of the present invention. As Figure 5 shown, the method includes:

[0059] Step 101: Determine a target power mode from at least one power mode for visible light communication according to the uplink and downlink time slot configuration information and the SSB configuration period;

[0060] Step 102: Adjust the transmission power of the optical signal according to the power configuration information corresponding to the target power mode; wherein, the power configuration information corresponding to each power mode in the at least one power mode is used to adjust the transmission power of the optical signal to a preset range of power fluctuations; the preset range is determined according to the frequency threshold and / or depth threshold of the power fluctuations.

[0061] In each embodiment of the present invention, the transmitting device may include a lighting fixture, such as a light-emitting diode (LED) fixture. Without affecting normal lighting, the transmitting device may carry a digital signal obtained by adjusting information onto the lighting fixture. For example, the lighting fixture emits rapid light pulses for wireless information transmission.

[0062] In this embodiment, to ensure that the power fluctuation caused by visible light communication does not affect human health, the transmitting device may set at least one power mode. The power fluctuation ranges of the transmitting device may be different under different power modes, and the power fluctuation range under each power mode is related to the frequency threshold and / or depth threshold of the power fluctuation. It can be understood that the frequency threshold and the depth threshold in this embodiment are parameters related to the light source flicker. For example, they can be determined according to the light source fluctuation depth requirements shown in Table 1. The power fluctuation ranges of the transmitting device under different power modes are all determined according to the frequency threshold and / or depth threshold to ensure that the visible light communication complies with the light source fluctuation specifications or requirements.

[0063] In the related art, the power fluctuation of a light source can be described by the fluctuation power ratio. The fluctuation power ratio is defined as v PFP = 100%×(A - B) / (A + B), where A represents the maximum value of the light output power within a power fluctuation period of the light source, and B represents the minimum value of the light output power within a power fluctuation period of the light source. Figure 6 is a schematic diagram of the power fluctuation period of the embodiment of the present invention. As Figure 6 shown, within a power fluctuation period, it can be abstracted into a high-power period and a low-power period. A can be taken as the Figure 6 high-power average value, and B can be taken as the Figure 6 low-power average value.

[0064] Figure 7 is a schematic diagram of the light source power fluctuation requirement of the embodiment of the present invention. As Figure 7 shown, the horizontal axis is the power fluctuation frequency f PFP , which is the reciprocal of the power fluctuation period, and the vertical axis is the fluctuation power ratio v PFP . In each embodiment of the present invention, the fluctuation frequency corresponding to a fluctuation power ratio of 100% is defined as the frequency threshold f PFP,max of the power fluctuation. When the power fluctuation frequency is greater than f PFP,max , the limitation of the fluctuation power ratio does not need to be considered. At the same time, the upper limit of the fluctuation power of the stroboscopic period is defined as the depth threshold v PFP,1 of the power fluctuation. When v PFP < v PFP,1 , there is no limitation on the power fluctuation period, that is, the power fluctuation no longer affects human health at this time.

[0065] Referring to Figure 7 , taking the requirements of the national standard for lamp source flicker shown in Table 1 as an example, when the frequency of power fluctuation is lower than a certain limit value, the corresponding fluctuation power ratio should also be within the corresponding value range, that is Figure 7 The shaded part in is the value range that meets the requirements of the light source in the national standard. For other specifications or requirements for lamp source flicker, the corresponding frequency threshold and depth threshold of power fluctuation can also be determined according to the specifications or requirements, which will not be elaborated here.

[0066] It can be understood that the preset range of power fluctuation in this embodiment can be determined based on the frequency threshold. For example, the power fluctuation frequency is greater than the frequency threshold f PFP,max ; alternatively, the preset range of the power fluctuation can be determined based on the depth threshold. For example, the fluctuation power ratio is less than the depth threshold v PFP,1 ; alternatively, the preset range of the power fluctuation can also be determined based on the frequency threshold and the depth threshold. For example, the power fluctuation frequency is less than the frequency threshold f PFP,max , and the fluctuation power ratio is less than the depth threshold v PFP,1 .

[0067] In this embodiment, the preset range of power fluctuation can be determined in advance according to the frequency threshold and / or depth threshold of power fluctuation, and the power configuration information of at least one power mode of the sending device can be further configured with reference to the preset range, so that each power configuration information can adjust the optical signal transmission power of the sending device to within this preset range. In addition, at least one power mode in this embodiment is also related to the uplink and downlink time slot configuration and the SSB configuration period. Different uplink and downlink time slot configuration relationships and / or SSB configuration periods can adopt different power modes.

[0068] In some embodiments, the uplink and downlink time slot configuration information may include at least one of the following: the number of time slot patterns corresponding to the uplink and downlink time slot ratio, the period of each time slot pattern, the uplink and downlink time slot ratio period, etc. The SSB configuration period is the transmission period of the SSB configuration, which can be configured by the high-layer signaling parameter ssb-periodicityServingCell.

[0069] As an example, the uplink and downlink time slot configuration information may include the uplink and downlink time slot ratio period; determining the target power mode among at least one power mode for visible light communication according to the uplink and downlink time slot configuration information and the SSB configuration period may include: determining the target power mode according to the proportional relationship between the uplink and downlink time slot ratio period and the SSB configuration period.

[0070] The power control method for visible light communication according to the embodiments of the present invention can pre-configure power configuration information corresponding to at least one power mode. The power configuration information corresponding to each power mode can adjust the transmission power of the optical signal to a preset range that meets the power fluctuation specification. When specifically performing power control, the target power mode can be determined from the at least one power mode according to the uplink time slot configuration information and the SSB configuration period of the visible light communication, and the transmission power of the optical signal can be adjusted according to the power configuration information of the target power mode. Thus, for various stroboscopic problems that may occur in visible light communication, different power configuration information is used to adjust the illumination power and transmission power in visible light communication, avoiding the problem that the light source fluctuation caused by communication does not meet the specification.

[0071] In an alternative embodiment of the present invention, the uplink and downlink time slot configuration information includes the number of time slot patterns corresponding to the uplink and downlink time slot ratio and the period of each time slot pattern; the sum of the periods of the respective time slot patterns is the uplink and downlink time slot ratio period; the determining of the target power mode from at least one power mode for visible light communication according to the uplink and downlink time slot configuration information and the SSB configuration period may include: when the uplink and downlink time slot configuration information and the SSB configuration period meet a first condition, determining the target power mode as the first power mode; wherein, the first condition at least includes: the SSB configuration period is an integer multiple of the uplink and downlink time slot ratio period, and the SSB configuration period is less than or equal to the reciprocal of the frequency threshold.

[0072] In one embodiment, the number of time slot patterns corresponding to the uplink time slot ratio is 1, and the period of this time slot pattern is T duration , that is, the uplink and downlink time slot ratio period is T duration ; in this embodiment, the SSB configuration period is an integer multiple of the uplink and downlink time slot ratio period, that is:

[0073] T SSB = nT duration , where n is an integer greater than 0;

[0074] the SSB configuration period is less than or equal to the reciprocal of the frequency threshold, that is:

[0075] T SSB ≤ 1 / f PFP,max

[0076] where T SSB represents the SSB configuration period.

[0077] In another embodiment, the number of time slot patterns corresponding to the uplink time slot ratio is 2, and the periods of the two time slot patterns are T duration,1 、T duration,2 , and the uplink and downlink time slot ratio period is Tduration,1 +T duration,2 ; In this embodiment, the SSB configuration period is an integer multiple of the uplink-downlink time slot ratio period, that is:

[0078] T SSB = n(T duration,1 +T duration,2 ), where n is an integer greater than 0;

[0079] The SSB configuration period is less than or equal to the reciprocal of the frequency threshold, that is:

[0080] T SSB ≤ 1 / f PFP,max

[0081] where T SSB represents the SSB configuration period.

[0082] This embodiment designs the first power mode in combination with the periodic transmission principle of the SSB signal. The first power mode needs to ensure that at least one uplink period is included within one SSB configuration period, and this SSB configuration period meets the frequency threshold requirement of power fluctuation.

[0083] In an alternative embodiment of the present invention, adjusting the transmission power of the optical signal according to the power configuration information corresponding to the target power mode may include: when it is determined that the target power mode is the first power mode, adjusting the first transmission power of the SSB to the transmission power of the SSS, and adjusting the transmission powers of multiple downlink signals, and the adjusted transmission power of each downlink signal is less than the first transmission power; adjusting the transmission power in the first time period to 0; the first time period includes the uplink-downlink time slot ratio period, the uplink time slot or symbol, and the flexible time slot or symbol adjacent to the uplink time slot or symbol.

[0084] In this embodiment, the power configuration information corresponding to the first power mode can be used to adjust the first transmission power of the SSB to the transmission power of the SSS, adjust the transmission powers of multiple downlink signals to be less than the first transmission power, and adjust the transmission power within the uplink-downlink time slot ratio period, the uplink time slot or symbol, and the flexible time slot or symbol adjacent thereto to 0.

[0085] Figure 8 is the power fluctuation schematic diagram of the first power mode of the embodiment of the present invention, as Figure 8As shown, in the first power mode, the high-power signal is the SSB signal, and the low-power signal includes the uplink period and the illumination signal within its flexible time slot or symbol (i.e., within the first time period), that is, the transmission signal within the uplink-downlink time slot ratio period, the uplink time slot or symbol, and the flexible time slot or symbol adjacent to the uplink time slot or symbol. It can be understood that after determining that the target power mode is the first power mode in this embodiment, it is necessary to adjust the first transmission power of the SSB signal to the transmission power of the SSS, and at the same time, it is also necessary to adjust the transmission power of multiple downlink signals. The transmission power of each adjusted downlink signal is less than the first transmission power, such as Figure 8 the signal transmission power within other downlink OFDM symbols in

[0086] It should be noted that in each embodiment of the present invention, "power" can refer to the average power value (within a short period of time). For example, the first transmission power can refer to the average power value of the SSB signal.

[0087] In this embodiment, in combination with the periodic transmission principle of the SSB signal, the first power mode is designed. In the first power mode, the power of the SSB signal is used as the high power within the power fluctuation period, and other uplink time slots or symbols and their adjacent flexible time slots or symbols may not emit light, achieving energy conservation while ensuring that the light source of visible light communication has no harmful stroboscopic effect.

[0088] In an alternative embodiment of the present invention, the multiple downlink signals at least include CSI-RS, DM-RS, and PDSCH; adjusting the transmission power of the multiple downlink signals may include: adjusting the transmission power of each downlink signal based on the power offset parameter corresponding to each downlink signal.

[0089] Exemplarily, in the related art, the power offset of CSI-RS is controlled by the parameter powerControlOffsetSS, which represents the power offset between CSI-RS and the EPRE of PBCH in SSB, and the range is {-3dB, 0dB, 3dB, 6dB}. Therefore, in this embodiment, the adjustment value of the power offset parameter corresponding to CSI-RS is -3dB or 0dB; the power offset of PDSCH is controlled by the parameter powerControlOffset, which represents the power offset between the EPRE of PDSCH and non-zero CSI-RS, and the range is an integer between -8dB and 15dB. Therefore, in this embodiment, the adjustment range of the power configuration parameter of PDSCH is an integer between -8dB and 0dB.

[0090] The power control method for visible light communication in this embodiment ensures that within one SSB configuration period in the first power mode, there is at least one uplink and downlink configuration period, and the SSB configuration period needs to be less than or equal to the reciprocal of the frequency threshold. The transmission power of visible light in all flexible time slots and uplink time slots included in the SSB is adjusted to 0. At the same time, it is ensured that the transmission power of the SSB is the maximum value of the transmission power of all downlink signals. There is no need to supplement additional DC power on other downlink symbols or time slots, nor to transmit additional lighting power on uplink symbols or time slots, saving energy while avoiding harmful stroboscopic effects.

[0091] In an alternative embodiment of the present invention, determining the target power mode among at least one power mode for visible light communication according to the uplink and downlink time slot configuration information and the SSB configuration period may include: when the uplink and downlink time slot configuration information and the SSB configuration period do not meet the first condition but meet the second condition, determining the target power mode as the second power mode; wherein, the second condition at least includes: the sum of the periods of two consecutive time slot patterns is less than or equal to the reciprocal of the frequency threshold.

[0092] In one embodiment, the number of time slot patterns corresponding to the uplink time slot ratio is 1, and the period of this time slot pattern is T duration , that is, the uplink and downlink time slot ratio period is T duration ; in this embodiment, the sum of the periods of two consecutive time slot patterns is less than or equal to the reciprocal of the frequency threshold, that is:

[0093] 2T duration ≤1 / f PFP,max

[0094] It can be understood that in this embodiment, when T SSB ≠nT duration and / or T sSB >1 / f PFP,max 、and 2T duration ≤1 / f PFP,max Under such circumstances, the target power mode is determined as the second power mode.

[0095] In another embodiment, the number of time slot patterns corresponding to the uplink time slot ratio is 2, and the periods of the two time slot patterns are T duration,1 、T duration,2 , the uplink and downlink time slot ratio period is T duration,1 +T duration,2 ; in this embodiment, the sum of the periods of two consecutive time slot patterns is less than or equal to the reciprocal of the frequency threshold, that is:

[0096] T duration,1 +T duration,2≤1 / f PFP,max

[0097] It can be understood that in this embodiment, when T SSB ≠n(T duration,1 +T duration,2 ) and / or T SSB >1 / f PFP,max , and T duration,1 +T duration,2 ≤1 / f PFP,max , the target power mode is determined to be the second power mode.

[0098] In some alternative embodiments, determining the target power mode among at least one power mode for visible light communication according to the uplink and downlink time slot configuration information and the SSB configuration period may include: determining the target power mode to be the second power mode when the uplink and downlink time slot configuration information and the SSB configuration period meet a second condition; wherein the second condition at least includes: the sum of the periods of two consecutive time slot patterns is less than or equal to the reciprocal of the frequency threshold.

[0099] In this embodiment, for the case where the subcarrier width of future visible light communication is further increased, resulting in a further reduction in the uplink and downlink time slot ratio period, the second power mode needs to ensure that there are two uplink periods within one power fluctuation period, that is, one power fluctuation period includes two uplink and downlink time slot ratio combinations.

[0100] In an alternative embodiment of the present invention, adjusting the transmission power of the optical signal according to the power configuration information corresponding to the target power mode may include: when determining that the target power mode is the second power mode, adjusting the transmission power of the second time period to the maximum transmission power of the downlink signal, where the second time period includes the period of the first time slot pattern in two consecutive time slot patterns, the uplink time slot or symbol, and the flexible time slot or symbol adjacent to the uplink time slot or symbol; adjusting the transmission power of the third time period and the fourth time period to 0; where the third time period includes the period of the second time slot pattern in two consecutive time slot patterns, the uplink time slot or symbol, and the flexible time slot or symbol adjacent to the uplink time slot or symbol, and the fourth time period includes the unused time slot or symbol in the downlink time slot or symbol.

[0101] In this embodiment, the power configuration information corresponding to the second power mode can be used to adjust the transmission power of the second time period to the maximum transmission power of the downlink signal, and adjust the transmission power of the third time period and the fourth time period to 0.

[0102] The second power mode takes the time periods corresponding to two consecutive time slot patterns as one power fluctuation period. Figure 9 For the power fluctuation schematic diagram of the second power mode of the embodiment of the present invention, asFigure 9 As shown, within a power fluctuation period, since there are two uplink periods, the transmission power of one of the uplink periods and its adjacent flexible time slots or symbols (i.e., the second period) (i.e., Figure 9 the maximum average power value of the illumination signal in the uplink period) can be adjusted to the maximum transmission power P of the downlink signal AC,max , where P AC,max = max{P PSS , P CSI-RS , P PDSCH} + P DC , P PSS , P CSI-RS and P PDSCH respectively represent the EPRE of the PSS signal, CSI-RS signal, and PDSCH signal, and P DC is the power of the DC bias signal; the transmission power of the other uplink period and its adjacent flexible time slots or symbols (i.e., the third period) (i.e., Figure 9 the minimum average power of the illumination signal in the uplink period) is adjusted to 0; in addition, the transmission power of the unused time slots or symbols (i.e., the fourth period) in the downlink time slots or symbols is also adjusted to 0. Thus, by forcibly reducing the transmission power of one of the uplink periods, the power fluctuation period can be made controllable.

[0103] The power control method for visible light communication according to the embodiment of the present invention ensures that the ratio period of two consecutive allocated uplink and downlink time slots is less than or equal to the reciprocal of the frequency threshold in the second power mode. At the same time, within the ratio period of two consecutive allocated uplink and downlink time slots, the flexible time slots in the previous period and the visible light in the uplink time slots are transmitted at a power greater than or equal to the maximum AC signal power in visible light communication, and the transmission power of the flexible time slots and the visible light in the uplink time slots in the latter period is adjusted to 0, which can reduce the baseband transmission power while ensuring no stroboscopic effect, achieving the purpose of baseband energy saving.

[0104] In an alternative embodiment of the present invention, determining the target power mode among at least one power mode for visible light communication according to the uplink and downlink time slot configuration information and the SSB configuration period may include: determining that the target power mode is the third power mode when the uplink and downlink time slot configuration information and the SSB configuration period do not satisfy the first condition and do not satisfy the second condition.

[0105] The third power mode of this embodiment can be for the remaining cases that do not satisfy the first condition and do not satisfy the second condition. Exemplarily, the number of time slot patterns corresponding to the uplink time slot ratio is 1, and the time slot pattern period is T duration , that is, the ratio period of the uplink and downlink time slots is T duration ; in this embodiment, it can be in T SSB ≠ nTduration and / or T SSB >1 / f PFP,max 、and 2T duration >1 / f PFP,max In the case of, determine the target power mode as the third power mode.

[0106] Alternatively, the number of time slot patterns corresponding to the uplink time slot ratio is 2, and the periods of the two time slot patterns are T duration,1 、T duration,2 , and the uplink and downlink time slot ratio period is T duration,1 +T duration,2 ; In this embodiment, it can be in T SSB ≠n(T duration,1 +T duration,2 ) and / or T SSB >1 / f PFP,max 、and T duration,1 +T duration,2 >1 / f PFP,max In the case of, determine the target power mode as the third power mode.

[0107] In an alternative embodiment of the present invention, adjusting the transmission power of the optical signal according to the power configuration information corresponding to the target power mode may include: in the case of determining that the target power mode is the third power mode, obtaining the maximum transmission power of the downlink signal, and determining the second transmission power according to the maximum transmission power and the depth threshold; adjusting the transmission power of the fifth time period to the second transmission power; wherein, the fifth time period includes unused time slots or symbols in the downlink time slot or symbol, uplink time slots or symbols, and flexible time slots or symbols adjacent to the uplink time slots or symbols.

[0108] This embodiment solves the stroboscopic problem from the perspective of power. The power configuration information corresponding to the third power mode can be used to adjust the transmission power of the fifth time period to the second transmission power determined by the maximum transmission power of the downlink signal and the depth threshold.

[0109] The transmitting device uses an alternating current signal when there is a signal to be transmitted, and the power of the alternating current signal is P AC , where P AC =P Base +P DC , P Base represents the baseband signal power, and P DC represents the direct current bias signal power, so as to ensure that P AC is a positive value. Figure 10 is the power fluctuation schematic diagram of the third power mode of the embodiment of the present invention, as Figure 10 shown, the second transmission power P unused is used in the unused OFDM symbols or time slotsTransmit an optical signal, and adjust the transmission power P within the uplink time slot or symbol and its adjacent flexible time slot or symbol UL (i.e., Figure 10 the average power of the illumination signal within the uplink period in unused ) to P as well.

[0110] As an implementation manner, determining the second transmission power according to the maximum transmission power and the depth threshold may be determined according to the following formula:

[0111]

[0112] where P AC,max is the maximum transmission power of the downlink signal, and P AC,max can be determined according to the EPRE of the PSS signal, CSI-RS signal, and PDSCH signal respectively (i.e., P PSS , P CSI-RS , and P PDSCH ) and the power P of the DC bias signal DC . For example, P AC,max = max{P PSS , P CSI-RS , P PDSCH}+ P DC .

[0113] The power control method for visible light communication in this embodiment configures the same transmission power on the downlink unused OFDM symbols or time slots, the uplink time slots, and the flexible time slots in the third power mode, and the transmission power and the communication power on the downlink used OFDM symbols or time slots should meet the requirements of the power fluctuation broken line model of the power LED light source. It is not necessary to adjust the idle downlink signals and uplink illumination power when different symbols are called or different signals are transmitted. The light source power when transmitting signals is a DC signal power of a certain intensity, avoiding health problems caused by power fluctuations, and having universality.

[0114] Based on the foregoing embodiments, the embodiments of the present invention further provide a power control method for visible light communication. In this embodiment, the at least one power mode may include at least one of the first power mode, the second power mode, and the third power mode.

[0115] As an optional implementation manner, the at least one power mode may only include the third power mode. The power configuration information corresponding to the third power mode is used to adjust the transmission power of the optical signal to a preset range of power fluctuations; the preset range is determined according to the frequency threshold and / or depth threshold of power fluctuations; the power control method for visible light communication may include:

[0116] Determine that the target power mode is the third power mode; obtain the maximum transmission power of the downlink signal, and determine the second transmission power according to the maximum transmission power and the depth threshold; adjust the transmission power in the fifth time period to the second transmission power; wherein, the fifth time period includes unused time slots or symbols in downlink time slots or symbols, uplink time slots or symbols, and flexible time slots or symbols adjacent to the uplink time slots or symbols. It can be understood that the third power mode in this embodiment can be applied to any situation of visible light communication.

[0117] As another alternative embodiment, at least one power mode may include the first power mode and the third power mode; wherein, the power configuration information corresponding to the first power mode or the third power mode is used to adjust the transmission power of the optical signal to a preset range of power fluctuations; the preset range is determined according to the frequency threshold and / or the depth threshold of the power fluctuations; the power control method for visible light communication may include:

[0118] When the uplink and downlink time slot configuration information and the SSB configuration period meet the first condition, determine that the target power mode is the first power mode; adjust the first transmission power of the SSB to the transmission power of the secondary synchronization signal SSS, and adjust the transmission power of multiple downlink signals, and the adjusted transmission power of each downlink signal is less than the first transmission power; adjust the transmission power in the first time period to 0; the first time period includes within the uplink and downlink time slot ratio period, uplink time slots or symbols, and flexible time slots or symbols adjacent to the uplink time slots or symbols; wherein, the first condition at least includes: the SSB configuration period is an integer multiple of the uplink and downlink time slot ratio period, and the SSB configuration period is less than or equal to the reciprocal of the frequency threshold; the uplink and downlink time slot configuration period includes the number of time slot patterns corresponding to the uplink and downlink time slot ratio and the period of each time slot pattern; the sum of the periods of each time slot pattern is the uplink and downlink time slot ratio period;

[0119] When the uplink and downlink time slot configuration information and the SSB configuration period do not meet the first condition, determine that the target power mode is the third power mode; obtain the maximum transmission power of the downlink signal, and determine the second transmission power according to the maximum transmission power and the depth threshold; adjust the transmission power in the fifth time period to the second transmission power; wherein, the fifth time period includes unused time slots or symbols in downlink time slots or symbols, uplink time slots or symbols, and flexible time slots or symbols adjacent to the uplink time slots or symbols.

[0120] As yet another alternative embodiment, at least one power mode may include the second power mode and the third power mode; wherein, the power configuration information corresponding to the second power mode or the third power mode is used to adjust the transmission power of the optical signal to a preset range of power fluctuations; the preset range is determined according to a frequency threshold and / or a depth threshold of the power fluctuations; the power control method for visible light communication may include:

[0121] When the uplink and downlink time slot configuration information satisfies the second condition, determine that the target power mode is the second power mode; adjust the transmission power of the second time period to the maximum transmission power of the downlink signal, wherein the second time period includes within the period of the first time slot pattern in two consecutive time slot patterns, the uplink time slot or symbol, and the flexible time slot or symbol adjacent to the uplink time slot or symbol; adjust the transmission power of the third time period and the fourth time period to 0; wherein, the third time period includes within the period of the second time slot pattern in two consecutive time slot patterns, the uplink time slot or symbol, and the flexible time slot or symbol adjacent to the uplink time slot or symbol, and the fourth time period includes the time slot or symbol not called in the downlink time slot or symbol; wherein, the second condition at least includes: the sum of the periods of two consecutive time slot patterns is less than or equal to the reciprocal of the frequency threshold; the uplink and downlink time slot configuration period includes the number of time slot patterns corresponding to the uplink and downlink time slot ratio and the period of each time slot pattern; the sum of the periods of each time slot pattern is the uplink and downlink time slot ratio period;

[0122] When the uplink and downlink time slot configuration information does not satisfy the second condition, determine that the target power mode is the third power mode; obtain the maximum transmission power of the downlink signal, and determine the second transmission power according to the maximum transmission power and the depth threshold; adjust the transmission power of the fifth time period to the second transmission power; wherein, the fifth time period includes the time slot or symbol not called in the downlink time slot or symbol, the uplink time slot or symbol, and the flexible time slot or symbol adjacent to the uplink time slot or symbol.

[0123] The power control scheme for visible light communication in the embodiments of the present invention will be described below in conjunction with specific application scenarios.

[0124] In this example, the transmitting device can operate in three power modes: a communication high power mode (i.e., the first power mode in the foregoing embodiments), an illumination high power mode (i.e., the second power mode in the foregoing embodiments), and a direct-through mode (i.e., the third power mode in the foregoing embodiments). The three power modes will be briefly introduced below respectively.

[0125] In the direct-through mode, specifically, reference may be made to Figure 10, the transmitting device needs to use the same transmission power on the unused OFDM symbols or time slots in the downlink and on the uplink time slots and their adjacent flexible time slots, and the transmission power should meet the requirements of the power fluctuation broken line model of the power of the LED light source in the downlink-called OFDM symbols or time slots. The advantage of this mode is that it is not necessary to adjust the idle downlink signals and uplink lighting power when calling different symbols or transmitting different signals, and the power of a DC signal with a certain intensity is used as the light source power when transmitting signals. However, the disadvantage is that in order to avoid light source strobing, continuous DC power is required, which will lead to increased energy consumption.

[0126] In the high-power lighting mode, specifically refer to Figure 9 , it is necessary to ensure that the ratio period of two consecutive allocated uplink and downlink time slots is less than or equal to the reciprocal of the frequency threshold. At the same time, within the ratio period of two consecutive allocated uplink and downlink time slots, the visible light in the flexible time slots and uplink time slots in the previous period needs to be transmitted with a power greater than or equal to the maximum AC signal power in visible light communication, and the transmission power of the visible light in the flexible time slots and uplink time slots in the latter period is 0. This mode forcibly reduces the power in one of the uplink periods to achieve the purpose of controllable power fluctuation period. The advantage is that it can reduce the power of the baseband transmission while ensuring no strobing, achieving the purpose of baseband energy saving.

[0127] In the high-power communication mode, specifically refer to Figure 8 , it is necessary to ensure that an SSB configuration period contains at least one uplink and downlink configuration period, and the SSB configuration period needs to be less than or equal to the reciprocal of the frequency threshold. At the same time, the transmission power of the visible light in all flexible time slots and uplink time slots in the uplink and downlink configuration periods included in the SSB is 0, and the transmission power of the SSB is the maximum value of the transmission power of all downlink signals. The advantage of this mode is that it is not necessary to add additional DC power for supplementation on other downlink symbols or time slots, nor is it necessary to transmit additional lighting power on uplink symbols or time slots, ensuring energy saving while ensuring that the light source has no harmful strobing.

[0128] Figure 11 This is a flowchart of an application example of the power control method for visible light communication according to an embodiment of the present invention. As Figure 11 shown, this process includes:

[0129] Step 201, obtain the number of cell-level uplink and downlink time slot patterns (patterns). If the number of patterns is 1, execute step 202. If the number of patterns is 2, execute step 203;

[0130] Step 202, determine whether the following two conditions are both satisfied:

[0131] T SSB = nT duration, where n is an integer greater than 0;

[0132] T SSB ≤1 / f PFP,max

[0133] If both of the above two conditions are satisfied, enter the communication high-power mode (i.e., the first power mode); otherwise, execute step 204.

[0134] Step 203: Determine whether the following two conditions are both satisfied:

[0135] T SSB = n(T duration,1 +T duration,2 ), where n is an integer greater than 0;

[0136] T SsB ≤1 / f PFP,max

[0137] If both of the above two conditions are satisfied, enter the communication high-power mode (i.e., the first power mode); otherwise, execute step 205.

[0138] Step 204: Determine whether the following condition is satisfied:

[0139] T duration ≤1 / f PFP,max

[0140] If the above condition is satisfied, execute step 206; otherwise, enter the direct-through mode (i.e., the third power mode).

[0141] Step 205: Determine whether the following condition is satisfied:

[0142] T duration,1 +T duration,2 ≤1 / f PFP,max

[0143] If the above condition is satisfied, enter the lighting high-power mode (i.e., the second power mode); otherwise, enter the direct-through mode (i.e., the third power mode).

[0144] Step 206: Determine whether the following condition is satisfied:

[0145] 2T duration ≤1 / f PFP,max

[0146] If the above condition is satisfied, enter the lighting high-power mode (i.e., the second power mode); otherwise, enter the direct-through mode (i.e., the third power mode).

[0147] In the above process, after entering the communication high-power mode, the following operations need to be performed: Set the downlink SSB power to P SSS(i.e., the second transmission power), adjust the power bias range in other RRC signaling. Among them, the power offset parameter powerControlOffsetSS corresponding to CSI-RS is adjusted to -3 dB or 0 dB, and the power offset parameter powerControlOffset corresponding to PDSCH is adjusted to an integer between -8 dB and 0 dB, ensuring that the transmission power of other downlink symbols is less than P SSS ; Set the power of the uplink period (i.e., the first time period, including uplink time slots or symbols and their adjacent flexible time slots or symbols) to P UL = 0.

[0148] After entering the high-power lighting mode, perform the following operations: Set the power of the unused downlink symbols or time slots (i.e., the fourth time period) to P unused = 0; Set the power of the uplink period to P UL,min = 0; Set the uplink lighting power (i.e., the transmission power in the second time period) in the first pattern of the power fluctuation period to P UL,max , where P UL,max = P Aa,max = max{P PSS , P CSI-RS , P PDSCH} + P DC , and set the uplink lighting power in the second pattern (in the third time period) to P UL,min .

[0149] After entering the direct mode, perform the following operations: Set the power of the unused downlink symbols or time slots (in the fifth time period) to P unused and the following conditions need to be met:

[0150]

[0151] At the same time, set the lighting power P UL of the uplink period (in the fifth time period) to P unused = P UL .

[0152] This example introduces the light source stroboscopic standard into visible light communication. By adjusting the lighting power and transmission power on the uplink and downlink time slots and flexible time slots of visible light communication, a direct mode for solving the stroboscopic problem from the power perspective is designed; in addition, considering that the visible light subcarrier width may further increase in the future and the uplink and downlink time slot ratio period may decrease, a high-power lighting mode is designed for this, which can avoid stroboscopic in visible light communication; finally, combined with the periodic transmission principle of SSB signals, a communication high-power mode is designed, with the SSB signal power designed as high power and other uplink time slots or flexible time slots not emitting light, ensuring energy conservation while also ensuring that the light source has no stroboscopic.

[0153] An embodiment of the present invention further provides a power control device for visible light communication, and the device is applied to a transmitting device. Figure 12 It is a schematic structural diagram of the composition of the power control device for visible light communication according to the embodiment of the present invention. As Figure 12 shown, the power control device 300 for visible light communication includes a mode determination module 301 and a power adjustment module 302; wherein,

[0154] The mode determination module 301 is configured to determine a target power mode from at least one power mode for visible light communication according to the uplink and downlink time slot configuration information and the SSB configuration period;

[0155] The power adjustment module 302 is configured to adjust the transmission power of the optical signal according to the power configuration information corresponding to the target power mode;

[0156] Wherein, the power configuration information corresponding to each power mode in the at least one power mode is used to adjust the transmission power of the optical signal to a preset range of power fluctuations; the preset range is determined according to a frequency threshold and / or a depth threshold of power fluctuations.

[0157] In an alternative embodiment of the present invention, the uplink and downlink time slot configuration information includes the number of time slot patterns corresponding to the uplink and downlink time slot ratios and the periods of each time slot pattern; the sum of the periods of each time slot pattern is the uplink and downlink time slot ratio period; the mode determination module 301 is configured to determine the target power mode as the first power mode when the uplink and downlink time slot configuration information and the SSB configuration period meet a first condition; wherein, the first condition at least includes: the SSB configuration period is an integer multiple of the uplink and downlink time slot ratio period, and the SSB configuration period is less than or equal to the reciprocal of the frequency threshold.

[0158] In an alternative embodiment of the present invention, the power adjustment module 302 is configured to, when determining that the target power mode is the first power mode, adjust the first transmission power of the SSB to the transmission power of the secondary synchronization signal SSS, and adjust the transmission powers of multiple downlink signals, and the adjusted transmission power of each downlink signal is less than the first transmission power; adjust the transmission power of the first time period to 0; the first time period includes the uplink time slot or symbol within the uplink and downlink time slot ratio period and the flexible time slot or symbol adjacent to the uplink time slot or symbol.

[0159] In an alternative embodiment of the present invention, the mode determination module 301 is configured to determine that the target power mode is the second power mode when the uplink-downlink time slot configuration information and the SSB configuration period do not satisfy the first condition but satisfy the second condition; wherein the second condition at least includes: the sum of the periods of two consecutive time slot patterns is less than or equal to the reciprocal of the frequency threshold.

[0160] In an alternative embodiment of the present invention, the power adjustment module 302 is configured to, when it is determined that the target power mode is the second power mode, adjust the transmission power of the second time period to the maximum transmission power of the downlink signal, where the second time period includes within the period of the first time slot pattern in two consecutive time slot patterns, the uplink time slot or symbol, and the flexible time slot or symbol adjacent to the uplink time slot or symbol; adjust the transmission power of the third time period and the fourth time period to 0; where the third time period includes within the period of the second time slot pattern in two consecutive time slot patterns, the uplink time slot or symbol, and the flexible time slot or symbol adjacent to the uplink time slot or symbol, and the fourth time period includes the unused time slot or symbol in the downlink time slot or symbol.

[0161] In an alternative embodiment of the present invention, the mode determination module 301 is configured to determine that the target power mode is the third power mode when the uplink-downlink time slot configuration information and the SSB configuration period do not satisfy the first condition and do not satisfy the second condition.

[0162] In an alternative embodiment of the present invention, the power adjustment module 302 is configured to, when it is determined that the target power mode is the third power mode, obtain the maximum transmission power of the downlink signal, determine a second transmission power according to the maximum transmission power and the depth threshold; adjust the transmission power of the fifth time period to the second transmission power; where the fifth time period includes the unused time slot or symbol in the downlink time slot or symbol, the uplink time slot or symbol, and the flexible time slot or symbol adjacent to the uplink time slot or symbol.

[0163] In an alternative embodiment of the present invention, the plurality of downlink signals at least include CSI-RS, DM-RS, and PDSCH; the power adjustment module 302 is configured to adjust the transmission power of each downlink signal based on the power offset parameter corresponding to each downlink signal.

[0164] In the embodiments of the present invention, the mode determination module 301 and the power adjustment module 302 in the power control device 300 for visible light communication can both be implemented by a central processing unit (CPU), a digital signal processor (DSP), a microcontroller unit (MCU), or a field-programmable gate array (FPGA) in the sending device in practical applications.

[0165] It should be noted that: when the power control device for visible light communication provided in the above embodiments performs power control, only the division of the above program modules is used for illustration. In practical applications, the above processing can be allocated to different program modules according to needs, that is, the internal structure of the device is divided into different program modules to complete all or part of the above-described processing. In addition, the power control device for visible light communication provided in the above embodiments and the embodiments of the power control method for visible light communication belong to the same concept. For the specific implementation process, please refer to the method embodiments and will not be elaborated here.

[0166] Figure 13 It is a schematic structural diagram of the sending device according to the embodiments of the present invention, as Figure 13 shown, the sending device 400 includes: at least one processor 401, a memory 402, and at least one network interface 403. Each component in the sending device 400 is coupled together through a bus system 404. It can be understood that the bus system 404 is used to realize the connection and communication between these components. In addition to the data bus, the bus system 404 also includes a power bus, a control bus, and a status signal bus. However, for the sake of clarity, in Figure 13 all kinds of buses are labeled as the bus system 404.

[0167] It can be understood that the memory 402 can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a ferromagnetic random access memory (FRAM), a flash memory, a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM); the magnetic surface memory can be a disk memory or a tape memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as a static random access memory (SRAM), a synchronous static random access memory (SSRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDR SDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a sync link dynamic random access memory (SLDRAM), a direct rambus random access memory (DRRAM).The memory 402 described in the embodiments of the present invention is intended to include, but is not limited to, these and any other suitable types of memories.

[0168] The memory 402 in the embodiments of the present invention is used to store various types of data to support the operation of the sending device 400. Examples of such data include: any computer programs for operating on the sending device 400, such as programs implementing the power control method for visible light communication in the embodiments of the present invention.

[0169] The methods disclosed in the above embodiments of the present invention can be applied to or implemented by the processor 401. The processor 401 may be an integrated circuit chip with signal processing capabilities. In the implementation process, the steps of the above methods can be completed by the integrated logic circuit in the hardware of the processor 401 or instructions in software form. The above processor 401 may be a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 401 can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. The general-purpose processor may be a microprocessor or any conventional processor, etc. Combining the steps of the methods disclosed in the embodiments of the present invention, it can be directly embodied as being executed and completed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software module may be located in a storage medium, which is located in the memory 402. The processor 401 reads the information in the memory 402 and combines its hardware to complete the steps of the foregoing methods.

[0170] In an exemplary embodiment, the sending device 400 can be implemented by one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontroller units (MCUs), microprocessors, or other electronic components for executing the foregoing methods.

[0171] In an exemplary embodiment, the embodiment of the present invention further provides a computer-readable storage medium, such as a memory 402 including a computer program, and the computer program can be executed by a processor 401 of a sending device 400 to complete the steps described in the foregoing method. The computer-readable storage medium may be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface memory, optical disc, or CD-ROM; or it may be various devices including one or any combination of the foregoing memories, such as mobile phones, computers, tablet devices, personal digital assistants, etc.

[0172] In several method embodiments provided by the present application, the methods disclosed can be combined arbitrarily without conflict to obtain new method embodiments.

[0173] In several product embodiments provided by the present application, the features disclosed can be combined arbitrarily without conflict to obtain new product embodiments.

[0174] In several method or device embodiments provided by the present application, the features disclosed can be combined arbitrarily without conflict to obtain new method embodiments or device embodiments.

[0175] In several embodiments provided by the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined, or can be integrated into another system, or some features can be ignored, or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed with each other can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical, or other forms.

[0176] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0177] In addition, in each embodiment of the present invention, each functional unit can be all integrated in a processing unit, or each unit can be separately used as a unit, or two or more units can be integrated in a unit; the above integrated unit can be implemented in the form of hardware, or in the form of a hardware plus a software functional unit.

[0178] Those of ordinary skill in the art will understand that all or part of the steps to implement the above method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps including those of the above method embodiments. The aforementioned storage medium includes various media that can store program codes, such as removable storage devices, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs.

[0179] Alternatively, if the above integrated units of the present invention are implemented in the form of software functional modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the embodiments of the present invention, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media that can store program codes, such as removable storage devices, ROM, RAM, magnetic disks, or optical discs.

[0180] As described above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A power control method for visible light communication, characterized in that, the method is applied to a transmitting device; the method includes: determining a target power mode among at least one power mode for visible light communication according to the uplink-downlink time slot configuration information and the synchronization signal block (SSB) configuration period; adjusting the transmission power of the optical signal according to the power configuration information corresponding to the target power mode; wherein, the power configuration information corresponding to each power mode in the at least one power mode is used to adjust the transmission power of the optical signal to a preset range of power fluctuations; the preset range is determined according to the frequency threshold and / or depth threshold of the power fluctuations.

2. The method according to claim 1, characterized in that, the uplink-downlink time slot configuration information includes the number of time slot patterns corresponding to the uplink-downlink time slot ratio and the period of each time slot pattern; the sum of the periods of the respective time slot patterns is the uplink-downlink time slot ratio period; the determining a target power mode among at least one power mode for visible light communication according to the uplink-downlink time slot configuration information and the SSB configuration period includes: when the uplink-downlink time slot configuration information and the SSB configuration period meet a first condition, determining the target power mode as a first power mode; wherein, the first condition at least includes: the SSB configuration period is an integer multiple of the uplink-downlink time slot ratio period, and the SSB configuration period is less than or equal to the reciprocal of the frequency threshold.

3. The method according to claim 1 or 2, characterized in that, the adjusting the transmission power of the optical signal according to the power configuration information corresponding to the target power mode includes: when it is determined that the target power mode is the first power mode, adjusting the first transmission power of the SSB to the transmission power of the secondary synchronization signal (SSS), and adjusting the transmission powers of a plurality of downlink signals, and the adjusted transmission power of each downlink signal is less than the first transmission power; adjusting the transmission power of a first time period to 0; the first time period includes the uplink-downlink time slot ratio period, the uplink time slot or symbol, and the flexible time slot or symbol adjacent to the uplink time slot or symbol.

4. The method according to claim 2, characterized in that, the determining a target power mode among at least one power mode for visible light communication according to the uplink-downlink time slot configuration information and the SSB configuration period includes: when the uplink-downlink time slot configuration information and the SSB configuration period do not meet the first condition but meet a second condition, determining the target power mode as a second power mode; wherein, the second condition at least includes: the sum of the periods of two consecutive time slot patterns is less than or equal to the reciprocal of the frequency threshold.

5. The method according to claim 1 or 4, characterized in that, the adjusting the transmission power of the optical signal according to the power configuration information corresponding to the target power mode includes: In the case where the target power mode is determined to be the second power mode, adjust the transmission power in the second time period to the maximum transmission power of the downlink signal, where the second time period includes the period of the first time slot pattern in two consecutive time slot patterns, an uplink time slot or symbol, and a flexible time slot or symbol adjacent to the uplink time slot or symbol; Adjust the transmission power in the third time period and the fourth time period to 0; where the third time period includes the period of the second time slot pattern in two consecutive time slot patterns, an uplink time slot or symbol, and a flexible time slot or symbol adjacent to the uplink time slot or symbol, and the fourth time period includes an unused time slot or symbol in a downlink time slot or symbol.

6. The method according to claim 4, characterized in that, Determining the target power mode among at least one power mode for visible light communication according to the uplink and downlink time slot configuration information and the SSB configuration period includes: In the case where the uplink and downlink time slot configuration information and the SSB configuration period do not satisfy the first condition and do not satisfy the second condition, determine that the target power mode is the third power mode.

7. The method according to claim 1 or 6, characterized in that, Adjusting the transmission power of the optical signal according to the power configuration information corresponding to the target power mode includes: In the case where the target power mode is determined to be the third power mode, obtain the maximum transmission power of the downlink signal, and determine the second transmission power according to the maximum transmission power and the depth threshold; Adjust the transmission power in the fifth time period to the second transmission power; where the fifth time period includes an unused time slot or symbol in a downlink time slot or symbol, an uplink time slot or symbol, and a flexible time slot or symbol adjacent to the uplink time slot or symbol.

8. The method according to claim 3, characterized in that, The multiple downlink signals at least include a channel state information reference signal CSI-RS, a demodulation reference signal DM-RS, and a physical downlink shared channel PDSCH; Adjusting the transmission power of the multiple downlink signals includes: Adjust the transmission power of each downlink signal based on the power offset parameter corresponding to each downlink signal.

9. A power control device for visible light communication, characterized in that, The device is applied to a transmitting device; the device includes a mode determination module and a power adjustment module; where, The mode determination module is configured to determine a target power mode among at least one power mode for visible light communication according to the uplink and downlink time slot configuration information and the SSB configuration period; The power adjustment module is configured to adjust the transmission power of the optical signal according to the power configuration information corresponding to the target power mode; Wherein, the power configuration information corresponding to each power mode in the at least one power mode is used to adjust the transmission power of the optical signal to a preset range of power fluctuations; the preset range is determined according to a frequency threshold and / or a depth threshold of power fluctuations.

10. A computer-readable storage medium, on which a computer program is stored, characterized in that, When the program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

11. A transmitting device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein: when the processor executes the program, the steps of the method according to any one of claims 1 to 8 are implemented.

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