Signal collision detection method and signal transmitting and receiving device

Abstract

A signal collision detection method comprises the following steps: (a) executing a first detection action by a signal transmitting and receiving device; (b) according to the step (a), if the signal conflict does not occur in the target frequency band, transmitting a target signal, and if the signal conflict possibly occurs, not transmitting the target signal; (c) after the target signal is transmitted in the step (b), executing a second detection action; (d) according to the step (c), if the signal conflict may occur in the target frequency band, executing a third detection action to detect whether the signal conflict may occur in the target frequency band; and (e) according to the step (d), if the signal conflict does not occur in the target frequency band, retransmitting the target signal, and if the signal conflict may occur, not retransmitting the target signal.

Description

Technical Field

[0001] This invention relates to a signal collision detection method and a signal transmission and reception device, and particularly to a signal collision detection method and a signal transmission and reception device that can avoid signal interference from the circuit itself and has high efficiency in signal collision detection. Background Technology

[0002] In modern society, wireless communication systems are quite widespread and diverse. Besides common civilian wireless communication systems such as 5G and Wi-Fi, microwave sensing devices (such as radar) are also common wireless communication systems. Microwave sensing devices are often used in potentially urgent communications, such as military or weather-related situations. Therefore, to avoid signal transmission conflicts between different systems (e.g., using overlapping frequency bands), signal collision detection is performed. However, microwave sensing devices typically send pulse signals, so allocating too much frequency band to microwave sensing devices to avoid signal collisions could result in wasting too much available frequency. Summary of the Invention

[0003] The purpose of this invention is to provide a more accurate and efficient method for detecting signal collisions.

[0004] Another objective of this invention is to provide a signal transmission and reception device that can detect signal collisions more accurately and efficiently.

[0005] An embodiment of the present invention discloses a signal collision detection method, which is used in a signal transmission and reception device, comprising: (a) performing a first detection action with the signal transmission and reception device to detect whether a signal collision may occur in a target frequency band to generate a first detection result; (b) if the first detection result indicates that the signal collision will not occur in the target frequency band, then transmitting a target signal with the signal transmission and reception device; if the first detection result indicates that the signal collision may occur in the target frequency band, then not transmitting the target signal with the signal transmission and reception device; (c) after transmitting the target signal in step (b), then transmitting the target signal with the signal transmission and reception device. (d) If the second detection result indicates that the target frequency band may experience the signal collision, the signal receiving device performs a third detection action to detect whether the target frequency band may experience the signal collision; and (e) If the third detection result indicates that the target frequency band will not experience the signal collision, the signal receiving device retransmits the target signal; if the third detection result indicates that the target frequency band may experience the signal collision, the signal receiving device does not retransmit the target signal.

[0006] Another embodiment of the present invention discloses a signal transmission and reception device, comprising: a transmission circuit; a receiving circuit; and a processing circuit, which is configured to control the transmission circuit and the receiving circuit to perform the following steps: (a) the receiving circuit performs a first detection action to detect whether a signal conflict may occur in the target frequency band to generate a first detection result; (b) if the first detection result indicates that the signal conflict will not occur in the target frequency band, then the transmission circuit transmits the target signal; if the first detection result indicates that the signal conflict may occur in the target frequency band, then the transmission circuit does not transmit the target signal; (c) the transmission circuit transmits the target signal in step (b). After receiving the target signal, the receiving circuit performs a second detection action to detect whether the target frequency band may experience signal conflict, thereby generating a second detection result; (d) if the second detection result indicates that the target frequency band may experience signal conflict, the receiving circuit performs a third detection action to detect whether the target frequency band may experience signal conflict; and (e) if the third detection result indicates that the target frequency band will not experience signal conflict, the transmitting circuit retransmits the target signal; if the third detection result indicates that the target frequency band may experience signal conflict, the transmitting circuit does not retransmit the target signal.

[0007] The present invention's method of performing detection actions before and after transmitting the target signal has several advantages. For example, when the transmitting circuit TX transmits the target signal, it may cause noise in the receiving circuit RX, which will affect the accuracy of the receiving circuit RX during detection. Performing detection actions before and after transmitting the target signal can increase the accuracy of the detection action. Furthermore, for example, the LNA 203 in the receiving circuit RX may amplify the noise. Performing detection actions after transmitting the target signal avoids the noise caused to the receiving circuit RX by the transmitting circuit TX during target signal transmission. Therefore, the LNA 203 can have a larger amplification factor, thereby improving the efficiency of the energy detection circuit 211 in detecting signal energy. Attached Figure Description

[0008] Figure 1 A block diagram depicting a signal transmission and reception apparatus according to an embodiment of the present invention. Figure 2 Depicting embodiments according to the present invention Figure 1 The transmission and receiving circuits are shown in more detail. Figure 3 as well as Figure 4 Schematic diagrams depicting the operation of signal transmission and reception devices according to different embodiments of the present invention. Figure 5 A flowchart depicting the operation of a signal transmission and reception device according to an embodiment of the present invention is provided. Figure 6A schematic diagram illustrating a second detection action performed only after a predetermined time has elapsed since the transmission of the target signal, according to an embodiment of the present invention. Figure 7 A flowchart depicting a signal collision detection method according to an embodiment of the present invention is provided. Detailed Implementation

[0009] The present invention will be described below with reference to several embodiments. Please note that the terms "first," "second," and similar descriptions used in the following description are only used to define different elements, parameters, data, signals, or steps, and are not intended to limit their order. For example, the first device and the second device may be devices with the same structure but different from each other.

[0010] Figure 1 A block diagram depicting a signal transmission and reception apparatus according to an embodiment of the present invention is shown. Figure 1 As shown, the signal transceiver 100 includes a transmitting circuit TX, a receiving circuit RX, and a processing circuit 103. The transmitting circuit TX is used to transmit the target signal TS, while the receiving circuit RX is used to receive the reflected signal RS. This reflected signal RS can be generated by the target signal TS being reflected by the target object 101. In the following embodiments, the signal transceiver 100 is a self-transmitting and self-receiving radar, i.e., a microwave sensing device, but it is not limited thereto. The processing circuit 103 is used to control the operation of the signal transceiver 100.

[0011] Figure 2 Depicting embodiments according to the present invention Figure 1 A schematic diagram of the transmission and receiving circuits in the image. (See attached diagram.) Figure 2 As shown, the receiving circuit RX includes a receiving antenna 201, an LNA (Low Noise Amplifier) ​​203, a mixer 205, a filter 207, an ADC (Analog to Digital Converter) 209, an energy detection circuit 211, a dechirp circuit 213, and a radar signal processing circuit 215. The transmitting circuit TX includes a transmitting antenna 217, a power amplifier 219, a mixer 221, a filter 223, a DAC 225, and a radar signal generation circuit 227. Mixers 205 and 221 adjust the frequency of the signal to the frequencies required by the receiving circuit RX and the transmitting circuit TX, respectively.

[0012] The radar signal generation circuit 227 generates a signal, which is processed by the DAC 225, filter 223, mixer 221, and power amplifier 219 before being transmitted via the transmitting antenna 217 as the target signal TS. The receiving antenna 201 receives the reflected signal RS, which is processed by the LNA 203, mixer 205, filter 207, and ADC 209 before being further processed by the dechirp circuit 213 and the radar signal processing circuit 215. The energy detection circuit 211 is used for detection, and its detailed operation will be described below.

[0013] Please note, Figure 2 This is merely an example; the signal transmission and reception devices used in this invention are not limited to... Figure 2 The example shown. Furthermore, Figure 2 The components shown are not limited to standalone circuits or devices; they can also achieve the same function through software or firmware. Furthermore, all components can be integrated into fewer components or further broken down into more components.

[0014] Figure 3 as well as Figure 4 Schematic diagrams depicting the operation of signal transmission and reception devices according to different embodiments of the present invention are provided. Figure 3 In this embodiment, the receiving circuit RX performs a first detection action CD_1 to detect whether signal interference may occur in the target frequency band, thereby generating a first detection result. In this embodiment, it is... Figure 2 The energy detection circuit 211 in the circuit detects the energy of the signal. If the signal energy is greater than the collision threshold, it indicates that there is signal interference in the target frequency band (i.e., a signal may be using at least a portion of the target frequency band). The first detection result is that a signal collision may occur in the target frequency band, therefore the transmission circuit TX does not transmit the target signal. Conversely, if the signal energy is less than the collision threshold, meaning there is no signal interference or minimal interference in the target frequency band, the first detection result is that a signal collision will not occur in the target frequency band. If the first detection result indicates that a signal collision will not occur in the target frequency band, the target signal (e.g., [missing information]) is transmitted via the transmission circuit TX. Figure 3 (Frame 1 in the text). However, the present invention is not limited to detecting whether signal collisions may occur in the target frequency band by detecting energy.

[0015] After transmitting the target signal, the receiving circuit RX performs a second detection action CD_2 to detect whether signal collisions may occur in the target frequency band, generating a second detection result. The transmitting circuit TX then decides whether to retransmit the target signal based on the second detection result. Figure 3 In this embodiment, since there is no signal interference or the signal interference is very low, that is, the second detection result is that there will be no signal conflict in the target frequency band, the target signal can be transmitted smoothly without having to retransmit the target signal.

[0016] And in Figure 4 In this embodiment, the second detection result represents the potential for signal interference in the target frequency band. Figure 4 If the signal is indicated by a slash (indicated in the image), the receiving circuit RX performs a third detection action CD_3 to detect whether a signal collision might occur in the target frequency band, thus generating a third detection result. The third detection action CD_3 and the second detection action CD_2 can be separated by a time interval, which may vary depending on the functional strength or condition of the device or circuit. If the third detection result indicates that a signal collision will not occur in the target frequency band, the target signal is then transmitted via the transmission circuit TX (e.g., frame 1 is transmitted again). If the third detection result indicates that a signal collision might occur in the target frequency band, the target signal is not transmitted via the transmission circuit TX.

[0017] exist Figure 4 In one embodiment, after the receiving circuit RX retransmits the target signal through the transmitting circuit TX, it can perform a fourth detection action CD_4 to detect whether a signal collision might occur in the target frequency band, thus generating a fourth detection result. The transmitting circuit TX will then decide whether to retransmit the target signal based on the fourth detection result. The detailed actions of the fourth detection action CD_4 are the same as those of the second detection action CD_2, and therefore will not be repeated here. However, in other embodiments, the detection action can be performed only before transmitting the target signal and not after transmitting the target signal; that is, only the third detection action CD_3 is performed without the fourth detection action CD_4. In this embodiment, if the retransmission of the target signal fails too many times, the transmission of the current target signal (frame 1) is abandoned. If transmission is successful (e.g., ...), the target signal is transmitted without further action. Figure 3 (Example of the embodiment), successful retransmission (e.g.) Figure 4 After the current target signal is transmitted (as in the embodiment described above) or transmission is stopped, the transmission circuit TX can transmit the next target signal (e.g., frame 2). The rules for transmitting, retransmitting, or stopping frame 2 are the same as those for frame 1, and therefore will not be repeated here.

[0018] Figure 5 A flowchart depicting the operation of a signal transmission and reception device according to an embodiment of the present invention includes the following steps:

[0019] Step 501

[0020] start.

[0021] Step 503

[0022] The transmission circuit TX receives an indication of the target signal. For example, in... Figure 3 and Figure 4 In one embodiment, the instruction of receiving transmission frame 1 is received.

[0023] Step 505

[0024] Set the TX retransmission count value to 0.

[0025] Step 507

[0026] Perform signal energy detection, i.e., perform the aforementioned first detection action CD_1.

[0027] Step 509

[0028] Confirm whether the signal energy is less than the collision threshold, that is, confirm whether the channel is idle and no signal collision will occur. If yes, proceed to step 511; otherwise, proceed to step 513.

[0029] Step 511

[0030] After waiting for a while, return to step 507.

[0031] Step 513

[0032] The transmission circuit TX transmits the target signal.

[0033] Step 515

[0034] Has the target signal been transmitted completely? If yes, proceed to step 517; otherwise, stay at step 515 until transmission is complete.

[0035] Step 517

[0036] Perform the second detection action CD_2.

[0037] Step 519

[0038] Confirm whether the signal energy is less than the collision threshold, that is, confirm whether the channel is idle and no signal collision will occur. If yes, proceed to step 521; otherwise, proceed to step 523.

[0039] Step 521

[0040] The target signal was successfully transmitted.

[0041] Step 523

[0042] If a signal conflict is detected, the target signal is retransmitted.

[0043] Step 525

[0044] Determine if the number of retransmissions is less than the retransmission threshold. If yes, proceed to step 527; otherwise, proceed to step 529.

[0045] Step 527

[0046] TX resends the count value +1 and proceeds to step 507.

[0047] Step 529

[0048] The transmission of the target signal has stopped, indicating that the transmission of the target signal has failed.

[0049] In this embodiment, the second detection action CD_2 is performed only after a predetermined time has elapsed since the receiving circuit RX completes the first detection action CD_1 and the transmitting circuit TX completes the transmission of the target signal. In this embodiment, the second detection action CD_2 is the time before the receiving circuit RX enters a stable state (or the time of the unstable state) after the transmitting circuit TX starts transmitting the target signal and the receiving circuit RX simultaneously begins its receiving action. In the stable state, the transmitting circuit TX does not perform a transmission action, but the receiving circuit RX performs a receiving action. Figure 6 A schematic diagram illustrating that, according to an embodiment of the present invention, a second detection action is performed only after a predetermined time has elapsed since the transmission of the target signal. Figure 6 As shown, within time T1, the transmitting circuit TX transmits the target signal while the receiving circuit RX simultaneously performs a receiving operation. After time T1, the transmitting circuit TX and the receiving circuit RX begin to switch and prepare to enter a stable state. Within the predetermined time TP, the receiving circuit RX has not yet entered a stable state. As mentioned earlier, in the stable state, the transmitting circuit TX does not perform a transmitting operation, but the receiving circuit RX performs a receiving operation. Within time T2, the receiving circuit RX enters a stable state and can therefore perform the aforementioned detection operation.

[0050] As mentioned earlier, the possibility of signal conflict can be determined by whether the signal energy within a predetermined frequency band exceeds a conflict threshold. The conflict threshold can be set using various methods. In this embodiment, it is determined based on the following equation: SNR = Pmin Pnoise

[0051] Where SNR is the minimum signal-to-noise ratio of the receiving circuit RX, and Pmin is the minimum signal energy that the energy detection circuit 211 can detect. Therefore, Pnoise is the maximum noise value that the receiving circuit RX can accept. Thus, in this embodiment, the collision threshold is the noise threshold; when it is greater than Pnoise, a signal collision is determined to be possible.

[0052] Based on the foregoing embodiments, a signal collision detection method can be obtained, which can be used in applications such as... Figure 1 The signal transmission and reception device shown. Figure 7 A flowchart illustrating a signal collision detection method according to an embodiment of the present invention is shown, comprising the following steps:

[0053] Step 701

[0054] The signal transmission and reception device 100 performs the first detection action CD_1 to detect whether signal conflict may occur in the target frequency band and generate the first detection result.

[0055] Step 703

[0056] If the first detection result indicates that the signal conflict will not occur in the target frequency band, the target signal is transmitted using the signal transmission and reception device. If the first detection result indicates that the signal conflict may occur in the target frequency band, the target signal is not transmitted using the signal transmission and reception device.

[0057] Step 705

[0058] After transmitting the target signal in step 703, the signal transmission and reception device performs the second detection action CD_2 to detect whether signal conflict may occur in the target frequency band and generate a second detection result.

[0059] Step 707

[0060] If the second detection result indicates that the target frequency band may experience signal conflict, the signal transmission and reception device performs a third detection action CD_3 to detect whether the target frequency band may experience signal conflict.

[0061] Step 709

[0062] If the third detection result indicates that the signal conflict will not occur in the target frequency band, the target signal will be retransmitted by the signal transmission and reception device. If the third detection result indicates that the signal conflict may occur in the target frequency band, the target signal will not be retransmitted by the signal transmission and reception device.

[0063] The present invention's method of performing detection actions before and after transmitting the target signal has several advantages. For example, when the transmitting circuit TX transmits the target signal, it may cause noise in the receiving circuit RX, which will affect the accuracy of the receiving circuit RX during detection. Performing detection actions before and after transmitting the target signal can increase the accuracy of the detection action. Furthermore, for example, the LNA 203 in the receiving circuit RX may amplify the noise. Performing detection actions after transmitting the target signal avoids the noise caused to the receiving circuit RX by the transmitting circuit TX during target signal transmission. Therefore, the LNA 203 can have a larger amplification factor, thereby improving the efficiency of the energy detection circuit 211 in detecting signal energy. The above description is only a preferred embodiment of the present invention. Any equivalent changes and modifications made to the scope of the present invention should be included in the scope of the present invention. Symbol Explanation

[0064] 100 Signal Transmission and Reception Device 103 Processing Circuit 201 Receiving Antenna 203LNA 205 Mixer 207 Filter 209ADC 211 Energy Detection Circuit 213 Frequency modulation demodulation circuit 215 Radar Signal Processing Circuit 217 Transmission Antenna 219 Power Amplifier 221 Mixer 223 filter 225DAC 227 Radar signal generation circuit Steps 501-529 Steps 701-709 CD_1 First Detection Action CD_2 Second Detection Action CD_3 Third Detection Action CD_4 Fourth Detection Action T1, T2 time TP Booking Time TS target signal RS reflected signal TX transmission circuit RX receiver circuit

Claims

1. A method for detecting signal collision, comprising: (a) performing a first detection operation on a signal transceiving device to detect whether a target frequency band is likely to experience a signal collision to produce a first detection result; (b) transmitting a target signal from the signal transceiving device if the first detection result indicates that the target frequency band is not likely to experience the signal collision, and not transmitting the target signal from the signal transceiving device if the first detection result indicates that the target frequency band is likely to experience the signal collision; (c) performing a second detection operation on the signal transceiving device to detect whether the target frequency band is likely to experience the signal collision after the step (b) transmits the target signal to produce a second detection result; (d) performing a third detection operation on the signal transceiving device to detect whether the target frequency band is likely to experience the signal collision if the second detection result indicates that the target frequency band is likely to experience the signal collision; and (e) retransmitting the target signal from the signal transceiving device if the third detection result indicates that the target frequency band is not likely to experience the signal collision, and not retransmitting the target signal from the signal transceiving device if the third detection result indicates that the target frequency band is likely to experience the signal collision.

2. The method of claim 1, further comprising: performing a fourth detection operation on the signal transceiving device to detect whether the target frequency band is likely to experience the signal collision after the step (e) retransmits the target signal for a predetermined time. The signal transceiving device is a microwave sensing device.

3. The signal collision detection method of claim 1, wherein, 4. The method of claim 3, wherein the signal transceiving device is a self- transmitting and self-receiving radar. The first detection operation, the second detection operation and the third detection operation are detecting signal energy on the target frequency band.

5. The signal collision detection method of claim 1, wherein, The step (c) performs the second detection operation after a predetermined time after the signal transceiving device transmits the target signal.

6. The signal collision detection method of claim 1, wherein, The signal transceiving device comprises a receiving circuit and a transmitting circuit, and the predetermined time is a time before the receiving circuit enters a stable state after the step (c) transmits the target signal by the transmitting circuit and the receiving circuit simultaneously performs a receiving operation.

7. The signal collision detection method of claim 6, wherein, The target signal is a frame.

8. The signal collision detection method of claim 1, wherein, 9. A signal transceiving device, comprising: a transmitting circuit; and Receiving circuitry a processing circuit to control the transmitting circuit and the receiving circuit to perform the following steps: (a) performing a first detection operation on the receiving circuit to detect whether a target frequency band is likely to experience a signal collision to produce a first detection result; (b) transmitting a target signal from the transmitting circuit if the first detection result indicates that the target frequency band is not likely to experience the signal collision, and not transmitting the target signal from the transmitting circuit if the first detection result indicates that the target frequency band is likely to experience the signal collision; ​ (c) after said step (b) transmitting said target signal, performing a second detection action by said receiving circuit to detect whether said signal collision is likely to occur in said target frequency band to generate a second detection result; (d) if said second detection result represents that said signal collision is likely to occur in said target frequency band, performing a third detection action by said receiving circuit to detect whether said signal collision is likely to occur in said target frequency band; and (e) if said third detection result represents that said signal collision is not likely to occur in said target frequency band, retransmitting said target signal by said transmitting circuit, and if said third detection result represents that said signal collision is likely to occur in said target frequency band, not retransmitting said target signal by said transmitting circuit.

10. The signal transmitting and receiving apparatus of claim 9, further comprising: after said step (e) retransmitting said target signal for a predetermined time, performing a fourth detection action by said receiving circuit to detect whether said signal collision is likely to occur in said target frequency band.

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