TWI790542B - Radiation power automatically adjusting method for a radio-frequency device and device thereof - Google Patents

Abstract

Radiation power automatically adjusting method for a radio-frequency device and device thereof includes the following. Set the radio-frequency device at a radiation power to transmit a message. A server receives the message through at least one base station. The base station which transfers the message provides the received signal strength indication and the number of a repeat of the message. The server counts the number of the base station which transfers the message. Compute a link quality score of the radio-frequency device according to the received signal strength indication, the number of a repeat of the message, and the number of the base station which received the message. The radio-frequency device adjusts its radiation power to transmit messages according to the link quality score.

Description

Method for automatically adjusting transmission power of radio frequency device and radio frequency device

The invention relates to a radio frequency device, in particular to a method capable of automatically adjusting transmission power and the radio frequency device thereof.

Low-Power Wide-Area Network (LPWAN) is a network that uses a frequency band less than 1GHz and performs long-distance communication at a low bit rate. Its low transmission power consumption is very suitable for IoT devices network solutions.

In order to ensure that network coverage can receive messages sent by IoT devices without dead ends, network operators will reasonably increase the coverage density of base stations. When a radio frequency device using IoT sends a message, it is received by several nearby base stations. If the message is received by more than several base stations, and the Received Signal Strength Indication (RSSI) of the message is very good, the power used by the radio frequency device to send the message and the success rate of message reception will have marginal benefits Decrease phenomenon, and then cause unnecessary waste. For a radio frequency device that uses a battery as a power source, if the transmission power cannot be effectively utilized, the service life of the battery will be affected accordingly.

The invention is to provide a method for automatically adjusting the transmission power of a radio frequency device and the radio frequency device, so as to increase the battery life of the radio frequency device.

The method for automatically adjusting the transmitting power of a radio frequency device disclosed in the present invention includes setting the radio frequency device to output a message with the transmitting power. The server is provided to receive the information output by the radio frequency device from at least one base station. The base station that received the message provides the signal strength of the message. The base station that received the message provides the number of repetitions of the received message. The server counts the number of base stations that have received the message. Calculate the connection quality score of the RF device based on the signal strength of the message, the number of repetitions, and the number of base stations that received the message. The radio frequency device adjusts the transmission power according to the connection quality score.

The radio frequency device for automatically adjusting transmission power disclosed in the present invention includes a transmission unit and a control unit. The control unit controls the transmission unit to output a message with transmission power, so that the message is transmitted to the server through at least one base station, and the control unit further adjusts the transmission power according to the connection quality score. The connection quality score is calculated based on the signal strength of the message, the number of repetitions, and the number of base stations that received the message. The signal strength of the message is provided by the base station receiving the message, and the base station receiving the message provides the number of repetitions of the received message. The server detects the number of base stations that have received the message.

According to the method for automatically adjusting the transmit power of a radio frequency device and the radio frequency device disclosed in the present invention, the connection quality score is calculated through the signal strength of the signal provided by the base station, the number of repetitions of the message and the number of base stations receiving the message. Furthermore, the transmitting power of the radio frequency device is adjusted according to the connection quality score, so that the radio frequency device can reduce the power consumption of the radio frequency device while ensuring the signal reception rate, thereby increasing the battery life of the radio frequency device.

The above description of the disclosure and the following description of the implementation are used to demonstrate and explain the spirit and principle of the present invention, and provide a further explanation of the patent application scope of the present invention.

The detailed features and advantages of the present invention are described in detail below in the implementation mode, and its content is enough to make any person familiar with the related art understand the technical content of the present invention and implement it accordingly, and according to the content disclosed in this specification, the scope of the patent application and the drawings , anyone skilled in the art can easily understand the purpose and advantages of the present invention. The following examples are to further describe the concept of the present invention in detail, but not to limit the scope of the present invention in any way.

Please refer to FIG. 1 . FIG. 1 is a flow chart showing the steps of a method for automatically adjusting the transmit power of a radio frequency device according to an embodiment of the present invention. As shown in FIG. 1 , a radio frequency device refers to a device with a wireless communication function, and is equipped with an antenna to transmit collected or sensed information to the outside in a radial manner. Taking the application of the Internet of Things as an example, the radio frequency device can collect the user's energy information such as gas, water, and electricity, and then send it to the outside through the antenna. Another example is that the radio frequency device can use radiation to send out the collected environmental data such as ambient temperature and humidity, the status of people in the house, the status of home appliances, and the status of parking spaces. The energy consumption or environmental data sent externally is effectively processed into various instructions through calculation and judgment to control the corresponding devices or systems. For example, the energy company converts the user's consumption into the fee that the user should pay and the payment notice to notify the user to pay the corresponding energy fee. Another example is to process the ambient temperature and humidity into the intensity switching instructions of refrigerators, air conditioners, or dehumidifiers, so as to adjust the temperature and humidity to the optimum temperature and humidity for an environment with too cold or too hot, or an environment with too high or too low humidity.

In some embodiments, the radio frequency device can directly control the corresponding device or system according to the processed command, or distribute the command to the corresponding device or system after receiving the command, which is not limited in this embodiment. In other embodiments, the radio frequency device does not receive instructions to control other devices or systems, but receives instructions to control the settings of the radio frequency device itself, such as requiring the radio frequency device to adjust its message transmission power, transmission frequency, sleep time and other settings, but This is not the limit.

In step S101, the radio frequency device is set to output a message with transmission power. Specifically, in one embodiment, the initial transmit power of the radio frequency device can be set according to the maximum transmit power limited by the Internet of Things regulations of various countries. Take Japan's ISM (Industrial Scientific Medical) frequency band 923Mhz as an example, this frequency band requires the maximum conducted output power (Maximum Conducted Output Power) of the radio frequency device to be 13dBm, and the maximum gain (peak gain) of the radio frequency device with the antenna is 3dBi. In other words, the Equivalent Isotropically Radiated Power (EIRP) of the radio frequency device needs to be lower than 16dBm, that is, in step S101, the radio frequency device sets the maximum conduction output power as the initial transmit power output message. In this embodiment, the initial transmission power is, for example, the setting of the radio frequency device when it leaves the factory, or the transmission power of the radio frequency device outputting a message for the first time. The initial transmission power is used for illustration only, and the transmission power in step S101 is not limited to the initial transmission power. More specifically, the transmit power in step S101 refers to the power of the radio frequency device currently outputting messages.

In step S103, the providing server receives a message output from the radio frequency device from at least one base station. In other words, the server is the destination of the output messages from the radio frequency device. The information output by the radio frequency device will be transmitted to the server through more than one base station. In step S105, the base station receiving the message provides the signal strength of the message. In other words, when more than one base station receives the message sent by the radio frequency device, each base station that receives the message will provide the signal strength of the received message. Signal strength refers to a measurement value of wireless signal strength between a radio frequency device and a base station, such as a Received Signal Strength Indication (RSSI) of a signal, but is not limited thereto.

In step S107, the base station receiving the message provides the repetition times of the received message. That is to say, the radio frequency device can be set to repeatedly send each message multiple times, so as to increase the chance of the base station receiving the message. Therefore, a base station receiving a message output by an RF device may receive the message more than once. In one embodiment, the radio frequency device can send the same message three times at different frequencies within milliseconds to ensure the success rate of message reception, but not limited thereto. Since the base station receiving the message may receive more than one repeated message, the base station receiving the message will provide the signal strength of each received message in step S105. For example, when three base stations receive the message output by the radio frequency device, and the repetition times of the message received by the three base stations are three times, two times and two times respectively, the three base stations will respectively provide three Signal Strength, Two Signal Strengths, and Two Signal Strengths. In one embodiment, the base station transmits the signal strength and the repetition times of the received message to the server, but it is not limited thereto.

In step S109, the server counts the number of base stations that have received the message. When the base station receives the message output by the radio frequency device, each base station that receives the message will send the message to the server. The server receives the message and counts the number of base stations that have received the message. In this embodiment, the order of steps S105 to S109 is only for convenience of description, and does not limit the execution of steps S105 to S109 according to the order of description. For example, the base station can simultaneously provide the signal strength of the received message and the number of repetitions of the received message, which is not limited in this embodiment. Those with ordinary knowledge in the technical field of the present invention can design the sequence of steps S105 to S109 according to actual situations.

In step S111, the connection quality score of the radio frequency device is calculated according to the signal strength of the message, the number of repetitions and the number of base stations receiving the message. That is to say, step S111 judges the communication quality between the radio frequency device and the base station according to the signal strength of the message obtained from step S105 to step S109 , the number of repetitions and the number of base stations receiving the message. In one embodiment, step S111 may be performed by a server, or may be performed by a radio frequency device or other suitable devices, which is not limited in this embodiment. When executed by a radio frequency device or other suitable device, the signal strength of the message provided by the base station, the number of message repetitions and the number of base stations counted by the server are transmitted to the radio frequency device or other suitable device for calculation.

In step S113, the radio frequency device adjusts the transmission power according to the connection quality score. In order to ensure the success rate of receiving the message sent by the radio frequency device, the radio frequency device is set to repeatedly transmit the message multiple times, and it is also designed to allow multiple base stations to receive the message output by the radio frequency device. Therefore, as long as the server can receive the message from the radio frequency device, The connection quality benefits of radio frequency devices will gradually decrease. In other words, when the connection quality of the radio frequency device is good, moderately reducing the transmission power of the radio frequency device to maintain the connection quality of the radio frequency device at a certain level can not only achieve good benefits for the connection quality of the radio frequency device, but also The power consumption of the radio frequency device can be reduced, thereby increasing the battery life of the radio frequency device.

Please refer to FIG. 2 . FIG. 2 is a flow chart showing the steps of a method for automatically adjusting the transmit power of a radio frequency device according to another embodiment of the present invention. As shown in FIG. 2 , in step S201 , the radio frequency device is set to transmit power to output a message. In step S203, the providing server receives a message output from the radio frequency device from at least one base station. In step S205, the base station receiving the message provides the signal strength of the message. In step S207, the base station receiving the message provides the repetition times of the received message. In step S209, the server counts the number of base stations that have received the message. For the detailed description of the foregoing steps, reference may be made to the embodiment in FIG. 1 , and the order of steps S205 to S209 is also for convenience of description, and does not limit the execution of steps S205 to S209 in the order described. Those with ordinary knowledge in the technical field of the present invention can properly design the sequence of steps S205 to S209 according to the actual situation, which is not limited in this embodiment.

Next, in step S211, the average signal strength of the message is calculated according to the signal strength of the message and the number of repetitions. In one embodiment, the server calculates the average signal strength of the message according to the signal strength and repetition times of the message. The server can be calculated by the following calculation method:

In the above calculation formula, RSSIavg represents the average signal strength of the message, RSSIBS represents the signal strength provided by one of the base stations that received the message, and nbRepetitionBS represents the number of message repetitions provided by one of the base stations that received the message. The server adds the product of the signal strength of each base station receiving the message and the number of repetitions, and then divides it by the sum of the number of times each base station receives the message to obtain the average signal strength of the message. In other words, BS indicates the base station that has received the message, BS equal to 1 means the first base station that received the message, and BS equal to n means the nth base station that received the message. In one embodiment, the RSSIBS may be the average signal strength of multiple messages received by the base station, or may be the highest or lowest signal strength. For example, when one of the base stations receives three repeated messages, the RSSIBS provided by the base station can be the average signal strength of the three messages, or the highest signal strength among the three messages, or the lowest signal among the three messages strength.

In step S213, the ratio of the minimum received signal strength to the average received signal strength is calculated. In step S215, the connection quality score is calculated according to the ratio of the minimum received signal strength to the average signal strength and the number of base stations that have received the message. In one embodiment, step S213 and step S215 can be calculated by the following calculation formula at the same time.

表示最小接收訊號強度，numberAllBS表示接收到訊息的基地台數量。在此案例中最小接收訊號強度例如是-150dBm，於所屬技術領域具有通常知識者可以依照實際情況決定最小接收訊號強度的值，本實施例不予限制。 In the above calculation formula, Score represents the connection quality score,

Indicates the minimum received signal strength, numberAllBS indicates the number of base stations that received the message. In this case, the minimum received signal strength is, for example, -150dBm, and those skilled in the art can determine the value of the minimum received signal strength according to the actual situation, which is not limited in this embodiment.

In step S217, the radio frequency device adjusts the transmission power according to the connection quality score. According to step S207 and step S209, the radio frequency device is set to repeatedly transmit the message multiple times, and the base stations near the radio frequency device can all receive the message output by the radio frequency device, so as to ensure that the message sent by the radio frequency device is successfully received. Therefore, in order to avoid the gradual decline in the efficiency of the transmission power of the output message of the radio frequency device, when the connection quality of the radio frequency device is maintained at a certain level, reducing the transmission power of the radio frequency device can reduce unnecessary power consumption of the radio frequency device, thereby Increase the battery life of the radio frequency device.

In the embodiment of FIG. 2 , the description of calculating the connection quality score by the server from step S211 to step S215 is only for convenience of description, and does not limit that the server performs step S211 to step S215. In other embodiments, it can also be Steps S211 to S215 are performed by a radio frequency device or other equipment, which is not limited in this embodiment.

Please refer to FIG. 3 . FIG. 3 is a flow chart showing the steps of a method for automatically adjusting the transmit power of a radio frequency device according to yet another embodiment of the present invention. As shown in FIG. 3 , in step S301 , the radio frequency device is set to transmit power to output a message. In step S303, the providing server receives a message output from the radio frequency device from at least one base station. In step S305, the base station receiving the message provides the signal strength of the message. In step S307, the base station receiving the message provides the repetition times of the received message. In step S309, the server counts the number of base stations that have received the message. For the detailed description of the foregoing steps, reference may be made to the embodiment in FIG. 1 , and the order of steps S305 to S309 is also for convenience of description, and does not limit the execution of steps S305 to S309 in the order described. Those with ordinary knowledge in the technical field of the present invention can properly design the sequence of steps S305 to S309 according to the actual situation, which is not limited in this embodiment.

This embodiment provides another method for calculating the connection quality score. In step S311, the ratio of the signal strength to the signal strength plus a fixed value is calculated. In step S313, the power value is calculated. The power value means that the ratio calculated in step S311 is raised to the power of the number of repetitions. In step S315, the power value of each base station that received the message is multiplied to calculate the connection quality score. In one embodiment, step S311 to step S315 can be calculated by the following formula.

與

的比值將會得到一個大於1且接近1的數值。

越小，表示該基地台的訊號強度越大，

與

的比值也會更大。又，當一個基地台收到訊息的重複次數越多，

與

的比值再取重複次數的乘冪值就會越大，即

的值越大。當收到訊息的基地台數量越多，相乘接收到訊息的每一個基地台的乘冪值後的數值也會越高，即

越大，表示連線品質分數越高。 In the above calculation formula, Score represents the connection quality score, RSSIBS represents the signal strength provided by one of the base stations that received the message, and nFrames represents the number of message repetitions provided by one of the base stations that received the message. Specifically, because RSSIBS is usually a negative value, and according to the ISM regulations of various countries, the range of RSSIBS is -50dBm to -150dBm. therefore,

and

The ratio of will get a value greater than 1 and close to 1.

The smaller the value, the stronger the signal strength of the base station.

and

The ratio will also be larger. Also, when a base station receives more repetitions of the message,

and

The value of the ratio of the number of repetitions will be larger, that is,

The larger the value is. When the number of base stations receiving messages is larger, the value after multiplying the power value of each base station receiving messages will be higher, that is

The larger the value, the higher the connection quality score.

與

的比值為大於1且接近1的數值，也是固定值取1所得到的結果。於技術領域中具有通常知識者，可自行設計固定值的數值，本實施例不予限制。 In this embodiment, since RSSIBS is a negative value, therefore, dividing the absolute value of RSSIBS by the absolute value of RSSIBS minus a fixed value is equivalent to dividing RSSIBS by RSSIBS plus a fixed value, that is, in step S311, the signal strength and signal strength The ratio after adding the fixed value. In this embodiment, the fixed value subtracted from the absolute value of the signal strength is 1 only for convenience of description, and

and

The ratio of is a value greater than 1 and close to 1, which is also the result of taking a fixed value of 1. A person with ordinary knowledge in the technical field can design a fixed value by himself, which is not limited in this embodiment.

In step S317, the radio frequency device adjusts the transmit power according to the connection quality score. In other words, when the connection quality of the radio frequency device is maintained at a certain level, reducing the transmit power of the radio frequency device can reduce unnecessary power consumption of the radio frequency device, thereby increasing the battery life of the radio frequency device.

Please refer to FIG. 4 together. FIG. 4 is a flow chart of the steps of the method for automatically adjusting the transmitting power of the radio frequency device according to another embodiment of the present invention. As shown in FIG. 4 , in step S401 , the radio frequency device is set to transmit power to output a message. In step S403, the providing server receives a message output from the radio frequency device from at least one base station. In step S405, the base station receiving the message provides the signal strength of the message. In step S407, the base station receiving the message provides the repetition times of the received message. In step S409, the server counts the number of base stations that have received the message. In step S411, the connection quality score of the radio frequency device is calculated according to the signal strength of the message, the number of repetitions and the number of base stations receiving the message. For a detailed description of the foregoing steps, reference may be made to the embodiment in FIG. 1 . The order of steps S405 to S409 is for convenience of description, and does not limit the execution of steps S405 to S409 according to the order of description.

In addition, in step S411 , the method of calculating the connection quality score of the radio frequency device according to the signal strength of the message, the number of repetitions and the number of base stations receiving the message can refer to the description of the embodiment in FIG. 2 and FIG. 3 . In addition to the way of calculating the connection quality score in the embodiment shown in FIG. 2 and FIG. 3 , a person with ordinary knowledge in the technical field of the present invention can properly design other calculation connections according to the signal strength of the message, the number of repetitions, and the number of base stations receiving the message. The manner of the quality score is not limited in this embodiment.

Next, in step S413, it is determined whether the connection quality score is greater than a threshold. In one embodiment, the threshold value may be a minimum connection quality score at which the message output by the radio frequency device can be guaranteed to be received. In actual operation, for example, an experiment is obtained to obtain the success rate of receiving a message from multiple radio frequency devices under the same connection quality score. Or experiment a radio frequency device under different connection frequency scores, respectively output the success rate of receiving multiple messages, and judge the threshold value accordingly. When the receiving success rate of the output message of the radio frequency device is not greater than the receiving success rate of the previous smaller connection quality score, the previous smaller connection quality score can be set as the threshold value of the connection quality score. That is to say, when the connection quality score of the radio frequency device is at the threshold value, the transmission power used for outputting messages will achieve better benefits.

In other embodiments, the method of setting the threshold value of the connection quality score may also be to test the reception status of the output message of the radio frequency device in different environments, and average the connection quality score of the message being actually received, so as to set the threshold value . Alternatively, the threshold value may be set to 80% of the highest connection quality score. This embodiment does not limit the setting method of the threshold value. However, since the ISM frequencies stipulated by various countries are not the same, the setting of the threshold value will also be adjusted according to the ISM frequency stipulated in the region where the radio frequency device is located or the frequency range for setting the output message.

In step S415, when the connection quality score is greater than the threshold value, the radio frequency device adjusts the transmission power according to the power adjustment value. In one embodiment, after the server judges the connection quality score of the radio frequency device and determines the transmit power value that can be set by the radio frequency device, the power adjustment value is calculated, and the power adjustment value is transmitted to the radio frequency device and provided to the radio frequency device Set transmit power. In another embodiment, the server may also transmit the connection quality score of the radio frequency device to the radio frequency device, and the radio frequency device may judge the power adjustment value by itself and adjust the transmit power. This embodiment is not limited.

Taking a practical example, the current connection quality score of the radio frequency device may be affected by unexpected conditions in the environment. According to the current connection quality score, the transmission power of the radio frequency device is adjusted to the transmission power value corresponding to the current connection quality score, which may affect the receiving status of the next output message of the radio frequency device. Therefore, in one embodiment, when the connection quality score of the radio frequency device exceeds the threshold value, the radio frequency device may only lower the transmit power by one unit, such as 1dBm, but not limited thereto. In addition, the radio frequency device can also adjust the transmission power without depending on the connection quality score once. In one embodiment, for example, average the connection quality score of the message output by the radio frequency device within 24 hours, and adjust the transmission power once after obtaining the average connection quality score.

Specifically, when the radio frequency device is preparing to adjust the transmission power, it will output a return request to the server, for example, a message indicating the server to respond to the message code. When the server receives the message including the message code, the server will send a response message to the radio frequency device. The response message includes relevant information instructing the radio frequency device to adjust the transmission power, such as an average connection quality score or a power adjustment value, so that the radio frequency device can adjust the transmission power accordingly after receiving the message. Those with ordinary knowledge in the technical field can configure how the radio frequency device receives messages from the server according to the communication protocol or the actual communication method, which is not limited in this embodiment.

In step S417, when the connection quality score is not greater than the threshold value, the radio frequency device does not adjust the transmission power. In an actual situation, when the connection quality score is equal to the threshold value, it can be considered that the transmit power of the radio frequency device has achieved a good benefit, so there is no need to adjust the transmit power of the radio frequency device. When the connection quality score is less than the threshold value, it means that the current connection quality of the radio frequency device is no longer suitable for lowering the transmission power, so no further adjustment is required. In other embodiments, when the connection quality score is less than the threshold value, the radio frequency device may also increase the transmit power according to the power adjustment value, which is not limited in this embodiment.

Please refer to FIG. 5 , which is a functional block diagram of a radio frequency device according to an embodiment of the present invention. As shown in FIG. 5 , the radio frequency device 5 has at least a control unit 51 , a transmission unit 53 and an antenna 55 . The control unit 51 is, for example, a microcontroller (Microcontroller Unit, MCU) or other suitable controllers, used to control and integrate other units inside the radio frequency device 5 . The control unit 51 can set the transmission power of the transmission unit 53 to output the message, and make the message output through the antenna 55, and transmit to the server through at least one base station. For example, if the antenna 55 is required to output information at a power of 16 dBm, the control unit 51 will set the conduction output power of the transmission unit 53 according to the maximum peak gain (peak gain) of the antenna 55 . In other words, the control unit 51 controls the transmission unit 53 to output messages with transmission power.

When the server receives the message output from the radio frequency device 5 from the base station, the base station that receives the message provides the signal strength of the message and the number of repetitions of the received message. Specifically, the radio frequency device 5 can send the same message three times at different frequencies within milliseconds, and all nearby base stations that receive the signal can receive the message and send it to the server, thereby ensuring the success rate of message reception. In practice, each base station that receives a message will receive more than one repeated message, and the base station will provide the signal strength of each received message and the number of repetitions of the received message to the server, but not to the server device is limited. In other embodiments, the base station may also average the signal strength of the received message, and send the average signal strength and the repetition times of the received message to the server, which is not limited in this embodiment.

In addition, the server also counts the number of base stations that have received the message, and calculates the connection quality score of the radio frequency device 5 according to the signal strength of the message, the number of repetitions and the number of base stations that have received the message. In one embodiment, the connection quality score of the radio frequency device 5 is transmitted to the control unit 51 through the antenna 55 and the transmission unit 53, so that the control unit 51 adjusts the transmission power of the transmission unit 53 according to the connection quality score. In another embodiment, the server determines the power adjustment value according to the connection quality score, and transmits it to the control unit 51 through the antenna 55 and the transmission unit 53 , so that the control unit 51 controls and adjusts the transmission power of the transmission unit 53 . The method for automatically adjusting the transmission power of the radio frequency device 5 in this embodiment has actually been disclosed in the above-mentioned embodiments, and those with ordinary knowledge in the technical field can refer to the above-mentioned content for modification and implementation, and this embodiment will not repeat the description .

Based on the above, the embodiment of the present invention provides a method for automatically adjusting the transmission power of a radio frequency device and a radio frequency device, and calculates the connection quality score through the signal strength of the message provided by the base station, the number of repetitions of the message, and the number of base stations receiving the message , so that the radio frequency device can adjust the transmission power of the output message according to its connection quality score, so that the transmission power can achieve a better use efficiency. Maintain the marginal effect between the power used to send messages and the success rate of message reception, reduce the phenomenon of diminishing marginal effects, reduce unnecessary waste of power, increase the use time of power, reduce the frequency of battery replacement, and make radio frequency devices in the material Networking is more flexible.

Although the present invention is disclosed by the aforementioned embodiments, they are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, all changes and modifications are within the scope of patent protection of the present invention. For the scope of protection defined by the present invention, please refer to the appended scope of patent application.

S101～S113, S201～S217, S301～S317, S401～S417: steps 5: RF device 51: Control unit 53:Transmission unit 55: Antenna

FIG. 1 is a flow chart illustrating the steps of a method for automatically adjusting the transmit power of a radio frequency device according to an embodiment of the present invention. FIG. 2 is a flow chart showing the steps of a method for automatically adjusting the transmit power of a radio frequency device according to another embodiment of the present invention. FIG. 3 is a flow chart showing the steps of a method for automatically adjusting the transmit power of a radio frequency device according to yet another embodiment of the present invention. FIG. 4 is a flow chart showing the steps of a method for automatically adjusting the transmit power of a radio frequency device according to another embodiment of the present invention. FIG. 5 is a functional block diagram of a radio frequency device according to an embodiment of the present invention.

Claims (16)

A method for automatically adjusting the transmission power of a radio frequency device, comprising: Setting a radio frequency device to output a message with a transmission power; providing a server to receive the message output by the radio frequency device from at least one base station; the base station receiving the message provides the signal strength of the message; receiving the message The base station provides the number of repetitions received by the message; the server counts the number of base stations that have received the message; based on the signal strength of the message, the number of repetitions and the number of base stations that have received the message, calculate the serial number of the radio frequency device a line quality score; and the radio frequency device adjusts the transmitting power according to the connection quality score. The method for automatically adjusting the transmitting power of a radio frequency device as described in Claim 1, wherein in the step of calculating the connection quality score of the radio frequency device according to the signal strength of the message, the number of repetitions and the number of base stations receiving the message, include: calculating the average signal strength of the message based on the signal strength and the number of repetitions of the message; calculating a ratio of a minimum received signal strength to the average signal strength; and based on the ratio of the minimum received signal strength to the average signal strength and receiving the The number of base stations of the message is used to calculate the connection quality score. The method for automatically adjusting the transmitting power of a radio frequency device as described in Claim 1, wherein in the step of calculating the connection quality score of the radio frequency device according to the signal strength of the message, the number of repetitions and the number of base stations receiving the message, Including: calculating the ratio of the signal strength to the signal strength plus a fixed value; calculating a power value, the power value being the power of the ratio taking the number of repetitions; and multiplying each of the received messages The power value of the base station is used to calculate the connection quality score. The method for automatically adjusting the transmit power of a radio frequency device as described in Claim 1, wherein the step of adjusting the transmit power of the radio frequency device according to the connection quality score includes: when the connection quality score is greater than a threshold value, The radio frequency device reduces the transmission power by a fixed adjustment value; and when the connection quality score is not greater than the threshold value, the radio frequency device does not adjust the transmission power. The method for automatically adjusting the transmit power of a radio frequency device as described in Claim 1, wherein the step of adjusting the transmit power of the radio frequency device according to the connection quality score includes: when the connection quality score is greater than a threshold value, The radio frequency device adjusts the transmission power according to a power adjustment value; and when the connection quality score is not greater than the threshold value, the radio frequency device does not adjust the transmission power. The method for automatically adjusting the transmitting power of a radio frequency device as described in claims 4 and 5, wherein the threshold value is related to the area where the radio frequency device is located. The method for automatically adjusting the transmission power of a radio frequency device as described in claim 1, wherein when the message output by the radio frequency device includes a message code indicating that the server responds, the adjustment is based on the connection quality score of the radio frequency device The step of transmitting power further includes: when the server receives the message including the message code, the server sends a response message to the radio frequency device, and the response message instructs the radio frequency device to adjust the transmission power. The method for automatically adjusting the transmitting power of a radio frequency device as described in claim 1, wherein the connection quality score is an average connection quality score of multiple messages output by the radio frequency device. A radio frequency device for automatically adjusting transmission power, comprising: a transmission unit; and a control unit, which controls the transmission unit to output a message with a transmission power, so that the message is transmitted to a server through at least one base station, and the control unit The transmit power is further adjusted according to a connection quality score; wherein, the connection quality score is calculated based on the signal strength of the message, the number of repetitions and the number of base stations receiving the message, and the signal strength of the message is determined by the received The base station of the message provides, and the base station that receives the message provides the repetition times of receiving the message, and the server detects the number of base stations that receive the message. The radio frequency device for automatically adjusting transmission power as described in Claim 9, wherein the connection quality score is further calculated based on the ratio of a minimum received signal strength to an average signal strength of the message and the number of base stations receiving the message, the The average signal strength is calculated based on the signal strength and repetition times of the message. The radio frequency device for automatically adjusting transmission power as described in Claim 9, wherein the connection quality score is obtained by multiplying a power value of each base station that receives the message, and the power value is obtained by taking the message After the ratio of the signal strength to the signal strength plus a fixed value, the ratio is obtained by taking the power of the number of repetitions. The radio frequency device for automatically adjusting transmission power as described in Claim 9, wherein when the connection quality score is greater than a threshold value, the control unit reduces the transmission power with a fixed adjustment value, and when the connection quality score is not greater than the When the threshold value is exceeded, the control unit does not adjust the transmitting power. The radio frequency device for automatically adjusting transmission power as described in Claim 9, wherein when the connection quality score is greater than a threshold value, the control unit adjusts the transmission power according to a power adjustment value, and when the connection quality score is not greater than When the threshold value is reached, the control unit does not adjust the transmit power. The radio frequency device for automatically adjusting transmission power as described in claims 12 and 13, wherein the threshold value is related to the area where the radio frequency device is located. The radio frequency device for automatically adjusting transmission power as described in claim 9, wherein when the message output by the transmission unit includes a message code indicating that the server responds, the transmission unit waits to receive a response message that the server responds to, The response message instructs the control unit to adjust the transmit power. The radio frequency device for automatically adjusting transmission power as described in Claim 9, wherein the connection quality score is an average connection quality score of multiple messages output by the transmission unit.

Images