Channel switching method and device

Abstract

The invention provides a channel switching method and device, and the method comprises the steps: a wireless device carries out the communication frame transmission on a first channel, and carries out the radar sensing on a second channel; the wireless device stops radar sensing on the second channel before performing communication frame transmission on the first channel; alternatively, before the wireless device performs radar sensing on the second channel, the wireless device stops performing communication frame transmission on the first channel. By implementing the method and the device, the wireless equipment can realize communication frame transmission and radar perception, and the radar perception performance is improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a channel switching method and device. Background Art

[0002] There are more and more wireless local area network (WLAN) devices. Usually, WLAN devices can communicate, such as sending and receiving communication frames. However, in many scenarios, there is a strong demand for using WLAN devices for radar perception. Therefore, how to enable WLAN devices to achieve both communication frame transmission and radar perception is an urgent problem to be solved. Summary of the invention

[0003] The present application provides a channel switching method and device, which can enable wireless devices to realize both communication frame transmission and radar perception.

[0004] In a first aspect, an embodiment of the present application provides a channel switching method, wherein the method may be performed by a wireless device, or may be performed by a component of the wireless device (such as a processor, a chip, or a chip system, etc.). The channel switching method may include:

[0005] The wireless device performs communication frame transmission on a first channel and performs radar sensing on a second channel;

[0006] The wireless device stops transmitting the communication frame on the first channel by performing radar sensing on the second channel; or the wireless device stops transmitting the communication frame on the first channel by performing radar sensing on the second channel.

[0007] By implementing the method described in the first aspect, the wireless device can perform communication frame transmission and radar sensing on different channels respectively, and before transmitting the communication frame on the first channel, stop performing radar sensing on the second channel, or, before performing radar sensing on the second channel, stop transmitting the communication frame on the first channel, so that the wireless device can achieve both communication frame transmission and radar sensing.

[0008] In a possible implementation manner, before performing radar sensing on the second channel, the method further includes:

[0009] The wireless device switches from the first channel to the second channel; the first channel and the second channel are different channels supported by the wireless device.

[0010] When this method is implemented, before the wireless device performs radar sensing on the second channel, the wireless device needs to switch from the first channel to the second channel. That is, the wireless device can achieve communication frame transmission and radar sensing on different channels through channel switching.

[0011] In a possible implementation manner, the first channel is a busy channel detected by the wireless device, and the second channel is an idle channel detected by the wireless device.

[0012] By implementing this method, when the first channel for the wireless device to transmit communication frames is detected to be busy, it switches to the second channel that is detected to be relatively idle for radar perception, thereby improving radar perception performance.

[0013] In a possible implementation manner, the wireless device performs radar sensing on the second channel, including:

[0014] The wireless device performs one or more radar sensing operations on the second channel, and one radar sensing operation includes sending a self-clearing-to-send Self-CTS frame and sending a radar signal associated with the Self-CTS frame.

[0015] By implementing this method, the wireless device can perform one or more radar sensing operations on the second channel, and the number of times the radar sensing operations are performed on the second channel can be flexibly realized.

[0016] In a possible implementation manner, after performing radar sensing on the second channel, the method further includes:

[0017] The wireless device switches from the second channel to the first channel and continues to transmit communication frames on the first channel.

[0018] To implement this method, after the wireless device performs radar sensing on the second channel, it needs to switch to the first channel to continue transmitting communication frames to ensure the transmission of communication frames.

[0019] In a possible implementation, a radar sensing process includes one or more cyclic processes, and the multiple cyclic processes are continuous in time;

[0020] A cyclic process includes a process of switching from the first channel to the second channel, performing radar sensing on the second channel, and switching from the second channel to the first channel;

[0021] The radar sensing process is a process including a preset number of radar sensing operations, the time interval between two adjacent radar sensing operations in the preset number of radar sensing operations is a first time interval, and the radar sensing operation includes sending a self-clearing Self-CTS frame and sending a radar signal associated with the Self-CTS frame.

[0022] When implementing this method, a radar sensing process may include one loop process, or include multiple loop processes. If a radar sensing process includes one loop process, that is, the wireless device switches from the first channel to the second channel, and performs a preset number of radar sensing operations on the second channel, and then switches to the first channel, thereby avoiding the waste of air interface resources caused by switching channels back and forth.

[0023] In a possible implementation manner, communication frame transmission on the first channel exists between two adjacent cycle processes among the multiple cycle processes.

[0024] When this method is implemented, there is communication frame transmission on the first channel between two adjacent cycle processes. In other words, each time the wireless device switches from the second channel to the first channel, it will transmit communication frames on the first channel, thereby making full use of resources and ensuring the timeliness of communication frame transmission as much as possible.

[0025] In a possible implementation manner, the second channel includes the first channel, and a bandwidth of the second channel is greater than a bandwidth of the first channel.

[0026] When this method is implemented, the second channel for radar perception includes the first channel for communication frame transmission, and the bandwidth of the second channel is larger than the bandwidth of the first channel. In other words, while ensuring that the channel for communication frame transmission remains unchanged, the radar perception channel is widened, thereby improving the radar perception performance.

[0027] In a possible implementation manner, a main channel on the first channel and a main channel on the second channel are the same.

[0028] By implementing this method, after the radar sensing channel is widened, the main channel remains unchanged, minimizing the impact on communication frame transmission.

[0029] In a possible implementation manner, before the wireless device transmits a communication frame on the first channel and performs radar sensing on the second channel, the wireless device further includes:

[0030] When the radar sensing service needs to be started, the wireless device adjusts the working bandwidth from the first bandwidth to the second bandwidth, where the first bandwidth is the bandwidth of the first channel and the second bandwidth is the bandwidth of the second channel.

[0031] When this method is implemented, the working bandwidth of the wireless device is originally the bandwidth of the first channel for communication frame transmission. When the radar sensing service needs to be started, the working bandwidth is widened to a larger second bandwidth, so that radar sensing is performed on the widened larger bandwidth, thereby improving radar sensing performance.

[0032] In a possible implementation manner, before the wireless device switches from the first channel to the second channel, or before the wireless device adjusts the working bandwidth from the first bandwidth to the second bandwidth, the method further includes:

[0033] The wireless device sends a first frame on the first channel, wherein the first frame includes first indication information; the first indication information is used to instruct the wireless device to stop transmitting communication frames on the first channel; or,

[0034] The first frame includes second indication information, and the second indication information is used to indicate the time for which the wireless device occupies the first channel. Before the end time of the wireless device occupying the first channel, the wireless device stops transmitting communication frames on the first channel.

[0035] In this implementation, before the wireless device switches from the first channel to the second channel, the wireless device sends a first frame, and uses the first indication information or the second indication information to avoid packet loss caused by other devices still sending data packets to the wireless device on the first channel after the wireless device switches to the second channel. Before the wireless device adjusts its working bandwidth, the wireless device also sends a first frame, and uses the first indication information or the second indication information to avoid packet loss caused by other devices still sending data packets to the wireless device on the first channel during the period when the wireless device adjusts its working bandwidth.

[0036] In a possible implementation manner, the wireless device is a station STA, and the method further includes:

[0037] The wireless device receives a first acknowledgment frame for the first frame on the first channel.

[0038] In the implementation of this method, the wireless device is a STA. After the STA sends the first frame, it needs to wait to receive the first confirmation frame for the first frame, and when the first confirmation frame is received, the wireless device switches from the first channel to the second channel, or when the wireless device receives the first confirmation frame, the working bandwidth is adjusted from the first bandwidth to the second bandwidth. The wireless device waits to receive the confirmation frame for the first frame, which can ensure that the receiving end receives the first frame, so that data will not be sent to the wireless device on the first channel after the wireless device switches to the second channel, or data will not be sent to the wireless device during the period when the wireless device adjusts the bandwidth, thereby improving the reliability of transmission.

[0039] In a possible implementation manner, after the wireless device switches from the second channel to the first channel, or after the wireless device adjusts the working bandwidth from the first bandwidth to the second bandwidth, the method further includes:

[0040] The wireless device sends a second frame on the first channel, wherein the second frame includes third indication information, and the third indication information is used to instruct the wireless device to start communication frame transmission on the first channel.

[0041] When this method is implemented, when the wireless device switches from the second channel to the first channel or adjusts the working bandwidth, the wireless device sends the second frame on the first channel, and uses the third indication information to let other devices know that they can transmit communication frames with the wireless device on the first channel, thereby flexibly controlling the time for communication frame transmission on the first channel.

[0042] In a possible implementation manner, the wireless device is a station STA, and the method further includes:

[0043] The wireless device receives a second acknowledgment frame for the second frame on the first channel.

[0044] In this implementation, the wireless device is a STA. After the wireless device sends the second frame, it needs to wait for the reception of the second confirmation frame for the second frame, and when the second confirmation frame is received, the wireless device can continue to transmit the communication frame on the first channel. Alternatively, when the wireless device receives the second confirmation frame, the wireless device can transmit the communication frame on the first channel and perform radar sensing on the second channel. Since the second confirmation frame is received, it can be guaranteed that the receiving device has received the first frame, and then perform the corresponding operation, which can improve the reliability of transmission.

[0045] In a possible implementation, the end time of the wireless device occupying the first channel is the time when the wireless device switches from the second channel to the first channel, or the end time of the wireless device occupying the first channel is after the time when the wireless device switches from the second channel to the first channel.

[0046] When this method is implemented, before the wireless device switches from the first channel to the second channel, the wireless device indicates through the second indication information in the first frame that the end time of the wireless device's occupation of the first channel is at least the time when the wireless device switches from the second channel to the first channel, thereby instructing other devices not to send data to the wireless device during the period of occupying the first channel, and there is no need to indicate again after switching from the second channel to the first channel, thereby saving air interface resources.

[0047] In a possible implementation, the end time of the wireless device occupying the first channel is the completion time of the wireless device adjusting the working bandwidth from the first bandwidth to the second bandwidth, or the end time of the wireless device occupying the first bandwidth is after the completion time of the wireless device adjusting the working bandwidth from the first bandwidth to the second bandwidth.

[0048] When this method is implemented, before the wireless device adjusts its working bandwidth, the wireless device indicates through the second indication information in the first frame that the end time of the wireless device's occupation of the first channel is at least the completion time of the wireless device adjusting its working bandwidth. This makes it easier to instruct other devices not to send data to the wireless device during the period of occupying the first channel, without the need to instruct again after the adjustment of the working bandwidth is completed, thereby saving air interface resources.

[0049] In a possible implementation, the method further includes:

[0050] In the case where the radar sensing service needs to be stopped, the wireless device adjusts the working bandwidth from the second bandwidth to the first bandwidth.

[0051] When this method is implemented, when the radar sensing service needs to be stopped, for example, after multiple radar sensing processes are completed, the radar sensing service needs to be stopped, the wireless device needs to adjust the working bandwidth from the second bandwidth to the first bandwidth to save bandwidth resources.

[0052] In a possible implementation manner, before the wireless device adjusts the working bandwidth from the second bandwidth to the first bandwidth, the method further includes:

[0053] The wireless device sends a third frame on the first channel, wherein the third frame includes first indication information; the first indication information is used to instruct the wireless device to stop transmitting communication frames on the first channel; or,

[0054] The third frame includes second indication information, where the second indication information is used to indicate the time that the wireless device occupies the first channel. Before the end time of the wireless device occupying the first channel, the wireless device stops transmitting communication frames on the first channel.

[0055] In this implementation, before the wireless device adjusts its working bandwidth, the wireless device sends a third frame and uses the first indication information or the second indication information to avoid packet loss caused by other devices still sending data packets to the wireless device on the first channel during the period when the wireless device adjusts its working bandwidth.

[0056] In a possible implementation manner, the wireless device is a station STA, and the method further includes:

[0057] The wireless device receives a third acknowledgment frame for the third frame on the first channel.

[0058] In implementing this method, the wireless device is a STA. After the wireless device sends the third frame, it waits to receive a third confirmation frame for the third frame, and when the third confirmation frame is received, the working bandwidth is adjusted from the second bandwidth to the first bandwidth, which can ensure that the receiving end receives the third frame, so that data will not be sent to the wireless device during the period when the wireless device adjusts the bandwidth, thereby improving the reliability of transmission.

[0059] In a possible implementation manner, after the wireless device adjusts the working bandwidth from the second bandwidth to the first bandwidth, the method further includes:

[0060] The wireless device sends a fourth frame on the first channel, wherein the fourth frame includes third indication information, and the third indication information is used to instruct the wireless device to start communication frame transmission on the first channel.

[0061] When this method is implemented, after the wireless device has adjusted its working bandwidth, the wireless device sends the fourth frame on the first channel, and uses the third indication information to let other devices know that they can transmit communication frames with the wireless device on the first channel, thereby flexibly controlling the time for communication frame transmission on the first channel.

[0062] In a possible implementation manner, the wireless device is a station STA, and the method further includes:

[0063] The wireless device receives a fourth acknowledgment frame for the fourth frame on the first channel.

[0064] In this implementation, the wireless device is a STA. After the wireless device sends the fourth frame, it needs to wait for receiving the fourth confirmation frame for the fourth frame. When the fourth confirmation frame is received, the wireless device can transmit the communication frame on the first channel and perform radar sensing on the second channel. Since the fourth confirmation frame is received, it can be guaranteed that the receiving device has received the fourth frame, and then the communication frame is transmitted, which can improve the reliability of transmission.

[0065] In a possible implementation, the end time of the wireless device occupying the first channel is the completion time of the wireless device adjusting the working bandwidth from the second bandwidth to the first bandwidth, or the end time of the wireless device occupying the first channel is after the completion time of the wireless device adjusting the working bandwidth from the second bandwidth to the first bandwidth.

[0066] When this method is implemented, before the wireless device adjusts its working bandwidth, the wireless device indicates through the second indication information in the third frame that the end time of the wireless device's occupation of the first channel is at least the completion time of the wireless device adjusting its working bandwidth. This makes it easier to instruct other devices not to send data to the wireless device during the period of occupying the first channel, without the need to instruct again after the adjustment of the working bandwidth is completed, thereby saving air interface resources.

[0067] In a second aspect, an embodiment of the present application provides a communication device, including:

[0068] a transceiver unit, configured to transmit communication frames on a first channel and to perform radar sensing on a second channel;

[0069] Before the wireless device transmits a communication frame on the first channel, it stops performing radar sensing on the second channel; or, before the wireless device performs radar sensing on the second channel, it stops performing communication frame transmission on the first channel.

[0070] In a possible implementation manner, the communication device further includes:

[0071] a processing unit, configured to switch from the first channel to the second channel;

[0072] The first channel and the second channel are different channels supported by the wireless device.

[0073] In a possible implementation manner, the first channel is a busy channel detected by the wireless device, and the second channel is an idle channel detected by the wireless device.

[0074] In a possible implementation manner, the processing unit is further configured to switch from the second channel to the first channel;

[0075] The transceiver unit is also used to continue transmitting communication frames on the first channel.

[0076] In a possible implementation, a radar sensing process includes one or more cyclic processes, and the multiple cyclic processes are continuous in time;

[0077] A cyclic process includes a process of switching from the first channel to the second channel, performing radar sensing on the second channel, and switching from the second channel to the first channel;

[0078] The radar sensing process is a process including a preset number of radar sensing operations, the time interval between two adjacent radar sensing operations in the preset number of radar sensing operations is a first time interval, and the radar sensing operation includes sending a self-clearing Self-CTS frame and sending a radar signal associated with the Self-CTS frame.

[0079] In a possible implementation manner, the second channel includes the first channel, and a bandwidth of the second channel is greater than a bandwidth of the first channel.

[0080] In a possible implementation manner, a main channel on the first channel and a main channel on the second channel are the same.

[0081] In a possible implementation, the processing unit is also used to, when it is necessary to start the radar sensing service, cause the wireless device to adjust the working bandwidth from a first bandwidth to a second bandwidth, where the first bandwidth is the bandwidth of the first channel and the second bandwidth is the bandwidth of the second channel.

[0082] In a possible implementation manner, the transceiver unit is further used to send a first frame on the first channel, where the first frame includes first indication information; the first indication information is used to instruct the wireless device to stop transmitting communication frames on the first channel; or,

[0083] The first frame includes second indication information, and the second indication information is used to indicate the time for which the wireless device occupies the first channel. Before the end time of the wireless device occupying the first channel, the wireless device stops transmitting communication frames on the first channel.

[0084] In a possible implementation manner, the wireless device is a station STA, and the transceiver unit is specifically configured to receive a first confirmation frame for the first frame on the first channel.

[0085] In a possible implementation, the transceiver unit is further used to send a second frame on the first channel, the second frame includes third indication information, and the third indication information is used to instruct the wireless device to start communication frame transmission on the first channel.

[0086] In a possible implementation manner, the transceiver unit is further configured to receive a second confirmation frame for the second frame on the first channel.

[0087] In a possible implementation, the end time of the wireless device occupying the first channel is the time when the wireless device switches from the second channel to the first channel, or the end time of the wireless device occupying the first channel is after the time when the wireless device switches from the second channel to the first channel.

[0088] In a possible implementation, the end time of the wireless device occupying the first channel is the completion time of the wireless device adjusting the working bandwidth from the first bandwidth to the second bandwidth, or the end time of the wireless device occupying the first channel is after the completion time of the wireless device adjusting the working bandwidth from the first bandwidth to the second bandwidth.

[0089] In a possible implementation manner, the processing unit is further configured to adjust the working bandwidth from the second bandwidth to the first bandwidth when it is necessary to stop the radar sensing service.

[0090] In a third aspect, an embodiment of the present application provides a communication device, the communication device comprising a processor, configured to execute the method in any possible implementation of the first aspect. Alternatively, the processor is configured to execute a program stored in a memory, and when the program is executed, the method in any possible implementation of the first aspect is executed.

[0091] In a possible implementation manner, the memory is located outside the above communication device.

[0092] In a possible implementation manner, the memory is located within the above-mentioned communication device.

[0093] In the embodiment of the present application, the processor and the memory may also be integrated into one device, that is, the processor and the memory may also be integrated together.

[0094] In a possible implementation manner, the communication device further includes a transceiver, where the transceiver is used to receive a signal or send a signal.

[0095] In a fourth aspect, an embodiment of the present application provides a communication device, which includes a logic circuit and an interface, wherein the logic circuit and the interface are coupled; the interface is used to receive information, and the logic circuit is used to perform processing operations.

[0096] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, which is used to store a computer program. When the computer-readable storage medium is run on a computer, the method shown in any possible implementation of the first aspect above is executed.

[0097] In a sixth aspect, an embodiment of the present application provides a computer program product, which includes a computer program or a computer code, and when the computer program product is run on a computer, the method shown in any possible implementation of the first aspect above is executed.

[0098] In a seventh aspect, an embodiment of the present application provides a computer program. When the computer program is run on a computer, the method shown in any possible implementation of the first aspect is executed.

[0099] In an eighth aspect, an embodiment of the present application provides a wireless communication system, which includes at least one wireless device.

[0100] The technical effects achieved by the second to eighth aspects mentioned above can refer to the technical effects of the first aspect or the beneficial effects in the method embodiments shown below, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0101] Figure 1 is a schematic diagram of a communication system provided in an embodiment of the present application;

[0102] Figure 2a is a schematic diagram of a radar sensing operation provided in an embodiment of the present application;

[0103] Figure 2b is a schematic diagram of a radar sensing process provided in an embodiment of the present application;

[0104] Figure 3 It is a flow chart of a channel switching method provided in an embodiment of the present application;

[0105] Figure 4a is a flow chart of another channel switching method provided in an embodiment of the present application;

[0106] Figure 4b It is a schematic diagram of the cycle process provided by the embodiment of the present application;

[0107] Figure 4c It is a radar sensing process timing diagram provided by an embodiment of the present application;

[0108] Figure 4d It is a radar sensing process timing diagram provided by an embodiment of the present application;

[0109] Figure 4e It is a radar sensing process timing diagram provided by an embodiment of the present application;

[0110] Figure 5a It is a flow chart of another channel switching method provided in an embodiment of the present application;

[0111] Figure 5bThis is a schematic diagram of a working bandwidth adjustment provided by an embodiment of the present application;

[0112] Figure 5c This is a schematic diagram of a working bandwidth adjustment provided by an embodiment of the present application;

[0113] Figures 6 to 8 It is a structural diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0114] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described below in conjunction with the accompanying drawings.

[0115] The terms "first" and "second" in the specification, claims and drawings of this application are only used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0116] The "embodiment" mentioned in this article means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It can be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0117] In the present application, "at least one (item)" means one or more, "more than one" means two or more, "at least two (items)" means two or three and more than three, and "and / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c".

[0118] The embodiment of the present invention can be applied to a wireless local area network (WLAN). The standard currently adopted by WLAN is the Institute of Electrical and Electronics Engineers (IEEE) 802.11 series. A WLAN may include multiple basic service sets (BSS), and the basic service set includes access point stations (AP) and non-access point stations (None Access Point Station, Non-AP STA). Each basic service set may include an AP and multiple Non-AP STAs associated with the AP.

[0119] AP is also called a wireless access point or hotspot. AP is an access point for mobile users to enter the wired network. It is mainly deployed in homes, buildings and parks. The typical coverage radius is tens of meters to hundreds of meters. Of course, it can also be deployed outdoors. AP is equivalent to a bridge connecting wired and wireless networks. Its main function is to connect various wireless network clients together and then connect the wireless network to Ethernet. Specifically, AP can be a terminal device or network device with a Wireless Fidelity (WiFi) chip. Optionally, AP can be a device that supports the 802.11ax standard. Further optionally, the AP can be a device that supports multiple WLAN standards such as 802.11ac, 802.11n, 802.11g, 802.11b and 802.11a.

[0120] Non-AP STA can be a wireless communication chip, a wireless sensor or a wireless communication terminal. For example: a mobile phone that supports WiFi communication function, a tablet computer that supports WiFi communication function, a set-top box that supports WiFi communication function, a smart TV that supports WiFi communication function, a smart wearable device that supports WiFi communication function, a vehicle communication device that supports WiFi communication function, and a computer that supports WiFi communication function. Optionally, the site can support the 802.11ax standard, and further optionally, the site supports multiple WLAN standards such as 802.11ac, 802.11n, 802.11g, 802.11b and 802.11a.

[0121] For the convenience of description, Non-AP STAs are collectively referred to as STAs in the following embodiments.

[0122] Figure 1The following is a system diagram of a typical WLAN deployment scenario, including an AP and three STAs. The AP communicates with STA1, STA2, and STA3 respectively.

[0123] Communication frames can be transmitted between AP and STA, and the communication frames can also be called WiFi service frames. In the embodiment of the present application, the AP or STA can also perform radar sensing. How to enable the AP or STA to perform both communication frame transmission and radar sensing? The implementation method proposed in the present application is that the AP or STA transmits communication frames on the first channel and performs radar sensing on the second channel, wherein before transmitting the communication frame on the first channel, the radar sensing on the second channel is stopped; or, before the AP or STA performs radar sensing on the second channel, the communication frame transmission on the first channel is stopped.

[0124] Before introducing the method of the present application in detail, some concepts involved in the present application are briefly introduced first.

[0125] 1. Primary radar sensing operation

[0126] In the embodiment of the present application, a radar sensing operation includes sending a self-clear to send (Self-CTS) frame and a radar signal associated with the Self-CTS frame. Figure 2a As shown, it is a schematic diagram of a radar sensing operation, which includes a Self-CTS frame and a radar signal that follows it. Self-CTS is a standard 802.11 control frame, and its function is to compete for and clear the channel for subsequent radar signal transmission, so the network allocation vector (NAV) of the Self-CTS frame should be set to protect until the moment when the radar signal transmission ends. Exemplarily, the time interval between the Self-CTS frame and the radar signal to be transmitted this time is less than or equal to a time interval, for example, the time interval is 16us. Exemplarily, the duration T1 of a radar sensing operation can range from 50 to 500us. It is understandable that it can also be other durations, which are not limited in this application.

[0127] 2. Primary radar perception process

[0128] In the embodiment of the present application, a radar sensing process is a process including a preset number of radar sensing operations, and the preset number of times may be pre-configured. The time interval between two adjacent radar sensing operations in the preset number of radar sensing operations is a first time interval, and a radar sensing operation includes sending a Self-CTS frame and sending a radar signal associated with the Self-CTS frame. For example, Figure 2bAs shown, it is a schematic diagram of a radar sensing process. The duration of a radar sensing operation can be T1, and the starting time interval between two adjacent radar sensing operations is T2. All T2 in a radar sensing process can be the same value or different values. The duration of all radar sensing operations in a radar sensing process is T3. Exemplarily, the value range of T1 can be 50 to 500us. The value range of T2 can be 1 to 10ms, and the value range of T3 can be 50us to 1000ms, which means that a radar sensing process is allowed to contain only one radar sensing operation.

[0129] The following examples describe the embodiments of the data transmission method of the present application. It should be noted that the various technical solutions (or embodiments) of the present application can be implemented independently or in combination based on certain internal connections. The present application is not limited thereto. And the various terms and definitions between the various embodiments can be referenced to each other. In each embodiment of the present application, different implementations can also be implemented in combination or independently.

[0130] Please refer to Figure 3 , which is a flow chart of a channel switching method provided in an embodiment of the present application. Figure 1 It can be a system architecture diagram applicable to the channel switching method. Figure 3 As shown, the method may include: 101-102, wherein the execution order of each step is not limited by the embodiment of the present application. The channel switching method of the embodiment of the present application may include some or all of the following steps:

[0131] 101. A wireless device transmits a communication frame on a first channel.

[0132] 102. The wireless device performs radar sensing on a second channel.

[0133] Wherein, before the wireless device transmits a communication frame on the first channel, it stops performing radar sensing on the second channel; or, before the wireless device performs radar sensing on the second channel, it stops performing communication frame transmission on the first channel.

[0134] The wireless device in the embodiment of the present application may be a STA, or may also be an AP. Alternatively, the communication frame may be replaced by a WiFi service frame.

[0135] In one implementation, the first channel and the second channel are different channels supported by the wireless device. Before the wireless device performs radar sensing on the second channel, it is necessary to switch from the first channel to the second channel, so as to perform radar sensing on the second channel. Exemplarily, when the wireless device detects that the first channel for communication frame transmission is busy, it can select a second channel detected as idle and perform radar sensing on the second channel. For example, the wireless device can detect whether the channel is idle or busy through Carrier Sense Multiple Access with Collision Avoidance (CSMA / CA).

[0136] Further optionally, the wireless device may switch from the second channel to the first channel and continue to transmit communication frames on the first channel.

[0137] The wireless device switches from the first channel to the second channel, and the wireless device stops transmitting communication frames on the first channel. The wireless device switches from the second channel to the first channel, and the wireless device stops performing radar sensing on the second channel. For a detailed description of this implementation, please refer to Figure 4a The description of the embodiments is omitted for now.

[0138] In another implementation, the second channel includes the first channel, and the bandwidth of the second channel is greater than the bandwidth of the first channel. For example, the wireless device adjusts the working bandwidth from the original first bandwidth to the second bandwidth, the first bandwidth is the bandwidth of the first channel used for communication frame transmission, and the second bandwidth is the bandwidth used for the second channel. After the wireless device adjusts the working bandwidth, communication frame transmission is performed on the first channel in a time-division manner, and radar sensing is performed on the second channel. For a detailed description of this implementation, please refer to Figure 5a The description of the embodiments is omitted for now.

[0139] It can be understood that the communication frame transmission in the embodiments of the present application may include receiving communication frames and / or sending communication frames.

[0140] Please refer to Figure 4a , which is a flow chart of another channel switching method provided in an embodiment of the present application. Figure 1 It can be a system architecture diagram applicable to the channel switching method. Figure 4aAs shown, the method may include: 201-204, wherein the execution order of each step is not limited in the embodiment of the present application. The channel switching method in the embodiment of the present application may include some or all of the following steps, for example, it may include steps 201-203 in steps 201-204, or it may include steps 202-step 204, etc., which are not limited in the present application, and each step is illustrated below by example:

[0141] 201. A wireless device transmits a communication frame on a first channel.

[0142] 202. A wireless device switches from a first channel to a second channel.

[0143] In some implementations, the first channel and the second channel are different channels supported by the wireless device. Exemplarily, the first channel is a busy channel detected by the wireless device, and the second channel is an idle channel detected by the wireless device.

[0144] Exemplarily, when radar sensing is required on the first channel, the wireless device switches from the first channel to the second channel.

[0145] In some implementations, in order to avoid packet loss caused by other devices still sending communication frames to the wireless device on the first channel after the wireless device switches to the second channel, before the wireless device switches from the first channel to the second channel, the wireless device sends a first frame on the first channel, and the first frame includes the first indication information or the second indication information. The first indication information and the second indication information are respectively described by examples below:

[0146] Exemplarily, the first indication information is used to instruct the wireless device to stop transmitting communication frames on the first channel, for example, the first indication information instructs the wireless device to enter a sleep state. Exemplarily, the first frame may be a null frame (i.e., a NULL frame), and the first indication information may be carried in a Power Saving (PS) field in the NULL frame. When the PS field includes a first identifier, it instructs the wireless device to stop transmitting communication frames on the first channel, for example, the first identifier may be 1.

[0147] Exemplarily, the second indication information is used to indicate the time when the wireless device occupies the first channel. Alternatively, the second indication information may indicate the end time when the wireless device occupies the first channel. Before the end time when the wireless device occupies the first channel, the wireless device stops transmitting communication frames on the first channel. Accordingly, other devices will not send communication frames to the wireless device before the end time when the wireless device occupies the first channel, thereby avoiding packet loss problems. As an example, the end time when the wireless device occupies the first channel is the time when the wireless device switches from the second channel to the first channel. As another example, the end time when the wireless device occupies the first channel may be after the time when the wireless device switches from the second channel to the first channel. For example, the first frame may be a Self-CTS frame, and the second indication information may be carried in the NAV in the Self-CTS frame. The value of the NAV must at least indicate the time when the wireless device switches from the second channel to the first channel.

[0148] In some embodiments, the wireless device is a STA. After sending the first frame, the wireless device may further receive a first confirmation frame for the first frame on the first channel, and the first confirmation frame may be an ACK (Acknowledgement) frame. When the wireless device receives the first confirmation frame for the first frame on the first channel, the wireless device switches from the first channel to the second channel. For example, if the first frame is a NULL frame, the first confirmation frame may be an ACK frame for the NULL frame.

[0149] 203. The wireless device performs radar sensing on the second channel.

[0150] In some embodiments, the wireless device may perform one or more radar sensing operations on the second channel, where one radar sensing operation includes sending a Self-CTS frame and sending a radar signal associated with the Self-CTS frame.

[0151] 204. The wireless device switches from the second channel to the first channel, and continues to transmit communication frames on the first channel.

[0152] In some embodiments, when the wireless device needs to transmit a communication frame, the wireless device switches from the second channel to the first channel and continues to transmit the communication frame on the first channel. For example, when the number of communication frames to be sent buffered by the wireless device is greater than or equal to a threshold, the wireless device needs to switch from the second channel to the first channel.

[0153] In some implementations, after the wireless device switches from the second channel to the first channel, the wireless device sends a second frame on the first channel, and the second frame includes third indication information, and the third indication information is used to indicate that the wireless device starts to transmit communication frames on the first channel. Exemplarily, the third indication information indicates that the wireless device is in an awake state. When the wireless device is in an awake state, communication frame transmission can be performed on the first channel. For example, the second frame can be a NULL frame, and the third indication information can be carried in the PS field in the NULL frame. When the PS field includes a second identifier, it indicates that the wireless device starts to transmit communication frames on the first channel. For example, the second identifier can be 0.

[0154] In some embodiments, the wireless device is a STA, and after sending the second frame, the wireless device may further receive a second confirmation frame for the second frame on the first channel, and the second confirmation frame may be an ACK frame. When the wireless device receives the second confirmation frame for the second frame on the first channel, the wireless device continues to transmit communication frames on the first channel. For example, if the second frame is a NULL frame, the second confirmation frame may be an ACK frame for the NULL frame.

[0155] In an embodiment of the present application, radar sensing is performed on a more idle channel by switching channels to obtain better sensing performance.

[0156] In the embodiment of the present application, the process of switching the wireless device from the first channel to the second channel, performing radar sensing on the second channel, and switching from the second channel to the first channel is called a cycle process. Figure 4b As shown, it is an example of a cyclic process. It can be understood that when radar sensing is performed on the second channel, one or more radar sensing operations can be performed. For the relevant description of the radar sensing operation, please refer to the description of the aforementioned embodiment, which will not be repeated here.

[0157] A radar sensing process may include one or more loop processes. If a radar sensing process includes multiple loop processes, the multiple loop processes are continuous in time. The multiple loop processes are continuous in time, which can be understood as the end of the previous loop process in the multiple loop processes is the starting point of the next loop process, such as Figure 4b As shown, taking two time-continuous cycle processes as an example, the end of the previous cycle process is switching from the second channel to the first channel, and the starting point of the next cycle process is switching from the first channel to the second channel.

[0158] For example, there is communication frame transmission between two adjacent cycle processes in multiple cycle processes. In other words, the previous cycle process ends with switching to the first channel. After the wireless device transmits the communication frame on the first channel, it can perform the next cycle process, that is, switch from the first channel to the second channel. Figure 4b As shown, there is communication frame transmission between two adjacent cycle processes.

[0159] The following examples illustrate that a radar sensing process includes one cycle or multiple cycles:

[0160] Method 1: A radar sensing process includes a cycle process.

[0161] Exemplarily, in this mode 1, when the wireless device performs radar sensing on the second channel, it may perform a preset number of radar sensing operations and then switch to the first channel. Exemplarily, this mode 1 may be applicable to wireless devices that do not have high requirements on WLAN latency and throughput.

[0162] Combine the following Figure 4c , the first frame and the second frame are NULL frames, as an example, the wireless device can be a STA, it can be understood that the first frame and the second frame can also be other frames, and this application does not limit it. Figure 4c As shown, it is a timing diagram of the radar sensing process. In a radar sensing process, the wireless device declares a sleep state through a NULL frame and switches from a first channel to a second channel. After performing radar sensing on the second channel, it switches from the second channel to the first channel and declares a wake-up state through a NULL frame. Figure 4c The horizontal axis in the middle represents time. All radar perceptions visible on the air interface are performed within the radar perception process. The communication frame transmission of this embodiment only exists in the T4 time between two adjacent radar perception processes, and does not exist in the radar perception process. The value range of T4 depends on the specific business requirements.

[0163] Combine the following Figure 4c Taking a radar sensing process as an example, the wireless device sends a NULL frame with a PS bit equal to 1 on the first channel. After the wireless device receives an ACK frame replied by the associated AP on the first channel, the wireless device switches from the first channel to the second channel with relatively less air interface occupancy. The wireless device performs radar sensing on the second channel, including sending a Self-CTS frame and a radar signal associated with the Self-CTS frame. After the radar sensing on the second channel is completed, the wireless device switches from the second channel to the first channel, and then sends a NULL frame with a PS bit equal to 0 on the first channel. The wireless device receives an ACK frame replied by the associated AP on the first channel.

[0164] For example, Figure 4cThe value range of T1 can be 50 to 500us. The starting time difference between two radar sensing operations can be T2, and the value range of T2 can be 1 to 10ms. The duration of all radar sensing operations in a radar sensing process can be T3, and the value range of T3 can be 50us to 1000ms.

[0165] Method 2: A radar sensing process includes multiple cycles.

[0166] For example, in mode 2, when the wireless device performs radar sensing on the second channel, it may be that one or more radar sensing operations are performed and then switched to the first channel. In the subsequent examples, performing a radar sensing operation on the second channel and then switching to the first channel is used as an example.

[0167] Combine the following Figure 4d and Figure 4e An example is given to illustrate that the radar perception process includes multiple cycles. Figure 4d In the example, the first and second frames are NULL frames. Figure 4e In the example, the first frame and the second frame are Self-CTS frames. It is understandable that the first frame and the second frame can also be other frames, which is not limited in this application. Figure 4d The wireless device can be a STA. Figure 4e The wireless device can be a STA or an AP.

[0168] like Figure 4d As shown in FIG. 1 , it is a timing diagram of the radar sensing process. In a radar sensing process, the wireless device declares the sleep state and the wake-up state through NULL frames multiple times to switch from the first channel to the second channel multiple times, and from the second channel to the first channel multiple times. After switching from the first channel to the second channel, one or more radar sensing operations can be performed on the second channel. Figure 4d A radar sensing operation is taken as an example. Figure 4d The horizontal axis in the middle represents time. All radar perceptions visible to the air interface are performed within the radar perception process. The communication frame transmission of this embodiment can exist within the T4 time between two adjacent radar perception processes, or it can exist within the radar perception process. The value range of T4 depends on the specific business requirements.

[0169] Combine the following Figure 4dTake a radar sensing process as an example. Before each radar sensing operation, the wireless device sends a NULL frame with a PS bit equal to 1 on the first channel. After the wireless device receives the ACK frame replied by the associated AP on the first channel, it switches from the first channel to the second channel with relatively less air interface occupancy. After each radar sensing operation, the wireless device first switches back to the first channel from the second channel, and then sends a NULL frame with a PS bit equal to 0 on the first channel. The wireless device receives the ACK frame replied by the associated AP on the first channel. When the wireless device receives the ACK frame replied by the AP, the wireless device can transmit communication frames on the first channel. Figure 4d In the case of a wireless device, the remaining air interface time between two adjacent radar sensing operations can be used for communication frame transmission. If the wireless device is not notified to the AP that it is in the awake state for some reason, the remaining air interface time between two radar sensing operations cannot be used for communication frame transmission.

[0170] For example, Figure 4d The value range of T1 can be 50 to 500us. The starting time difference between two radar sensing operations is T2, and the value range of T2 can be 1 to 10ms. The duration of all radar sensing operations in a radar sensing process is T3, and the value range of T3 can be 50us to 1000ms.

[0171] like Figure 4e The following is a timing diagram of the radar sensing process. In a radar sensing process, the wireless device can switch channels multiple times through Self-CTS. Before each wireless device performs radar sensing, it switches from the first channel to the second channel through the Self-CTS frame. After performing radar sensing on the second channel, it switches from the second channel to the first channel. For easy distinction, Figure 4e The Self-CTS frame that triggers channel switching is called the first Self-CTS frame, and the Self-CTS frame in the radar sensing operation is called the second Self-CTS frame. The horizontal axis in the figure represents time, and all radar sensing states visible to the air interface are performed within a radar sensing process. The communication frame transmission of this embodiment can exist within the T4 time between two adjacent radar sensing processes, or it can exist within the radar sensing process. The value range of T4 depends on specific business requirements.

[0172] Combine the following Figure 4e Take a radar sensing process as an example. Before each radar sensing operation, the wireless device sends the first Self-CTS frame on the first channel. The NAV of the first Self-CTS frame should be set to protect the time from switching from the second channel to the first channel, or after the time from switching from the second channel to the first channel. Figure 4eAs shown, the NAV of the first Self-CTS frame needs to be protected at least until the end time 1 of the channel occupancy, and the NAV of the second Self-CTS frame needs to be protected at least until the end time 2 of the channel occupancy. After sending the first Self-CTS frame on the first channel, the wireless device switches from the first channel to the second channel with relatively less air interface occupancy, and performs radar sensing operations on the second channel, including sending the second Self-CTS frame and the radar signal associated with the second Self-CTS frame on the second channel. The NAV of the second Self-CTS frame must be protected at least until the moment when the sending of the radar signal associated with the second Self-CTS frame ends. Figure 4d , Figure 4e The provided method is more concise and less airtime is wasted.

[0173] In some implementations, the process of sending a first Self-CTS frame on a first channel, switching from the first channel to a second channel, sending a second Self-CTS frame on the second channel, sending a radar signal associated with the second Self-CTS frame on the second channel, and switching from the second channel to the first channel can be referred to as a radar sensing operation, and the duration of a radar sensing operation is T1. For example, the value range of T1 is 150 to 600 us. The starting time difference between the two radar sensing operations is T2, and the value range of T2 can be 1 to 10 ms. All T2s in a radar sensing process can be the same value or different values. The duration of all radar sensing operations in a radar sensing process is T3, and the value range of T3 can be 150 us to 1000 ms, that is, a radar sensing process is allowed to include a radar sensing operation. It can be understood that the above-mentioned radar sensing operation is only an example.

[0174] Please refer to Figure 5a , which is a flow chart of another channel switching method provided in an embodiment of the present application. Figure 1 It can be a system architecture diagram applicable to the channel switching method. Figure 5a As shown, the method may include: 301-304, wherein the execution order of each step is not limited by the embodiment of the present application. The channel switching method of the embodiment of the present application may include some or all of the following steps, for example, it may include steps 301-303 in steps 301-304, etc., which is not limited by the present application, and each step is illustrated below by example:

[0175] 301. The wireless device adjusts the working bandwidth from a first bandwidth to a second bandwidth.

[0176] In some embodiments, the original working bandwidth of the wireless device is the first bandwidth, which is also the bandwidth of the first channel for the wireless device to transmit communication frames. When the radar sensing service needs to be started, the wireless device adjusts the working bandwidth from the first bandwidth to the second bandwidth, the second bandwidth is greater than the first bandwidth, and the second bandwidth is within the bandwidth range supported by the wireless device, that is, the working bandwidth is adjusted to a larger bandwidth supported by the wireless device.

[0177] As an example, the wireless device may adjust the working bandwidth from the first bandwidth to the second bandwidth before multiple radar sensing processes, such as Figure 5b As shown, before multiple radar sensing processes, the radar sensing service is started, and the working bandwidth is adjusted from the first bandwidth to the second bandwidth. As another example, the wireless device may also adjust the working bandwidth from the first bandwidth to the second bandwidth before each radar sensing process, and adjust the working bandwidth from the second bandwidth to the first bandwidth after each radar sensing process ends, which is not limited in this application.

[0178] In some implementations, in order to avoid packet loss caused by other devices still sending communication frames to the wireless device on the first channel during the period when the wireless device adjusts the working bandwidth, before the wireless device adjusts the working bandwidth from the first bandwidth to the second bandwidth, the wireless device sends a first frame on the first channel, and the first frame includes the first indication information or the second indication information. The first indication information and the second indication information are respectively described by examples below:

[0179] Exemplarily, the first indication information is used to instruct the wireless device to stop transmitting communication frames on the first channel. Exemplarily, the first indication information instructs the wireless device to enter a sleep state. For example, the first frame may be a NULL frame, and the first indication information may be carried in a PS field in the NULL frame. When the PS field includes a first identifier, the wireless device is instructed to stop transmitting communication frames on the first channel. For example, the first identifier may be 1.

[0180] Exemplarily, the second indication information is used to indicate the time when the wireless device occupies the first channel. Alternatively, the second indication information may indicate the end time when the wireless device occupies the first channel. Before the end time when the wireless device occupies the first channel, the wireless device stops transmitting communication frames on the first channel. Accordingly, other devices will not send communication frames to the wireless device before the end time when the wireless device occupies the first channel, thereby avoiding packet loss problems. As an example, the end time when the wireless device occupies the first channel is the completion time when the wireless device adjusts the working bandwidth from the first bandwidth to the second bandwidth. As another example, the end time when the wireless device occupies the first channel may be after the completion time when the wireless device adjusts the working bandwidth from the first bandwidth to the second bandwidth. For example, the first frame may be a Self-CTS frame, and the second indication information may be carried in the NAV in the Self-CTS frame. The value of the NAV must at least indicate the completion time when the wireless device adjusts the working bandwidth from the first bandwidth to the second bandwidth.

[0181] In some embodiments, the wireless device is a STA, and after sending the first frame, the wireless device may further receive a first confirmation frame for the first frame on the first channel, and the first confirmation frame may be an ACK frame. When the wireless device receives the first confirmation frame for the first frame on the first channel, the wireless device adjusts the working bandwidth from the first bandwidth to the second bandwidth.

[0182] In some implementations, after the wireless device adjusts the working bandwidth from the first bandwidth to the second bandwidth, the wireless device sends a second frame on the first channel, and the second frame includes third indication information, and the third indication information is used to indicate that the wireless device starts communication frame transmission on the first channel. Exemplarily, the third indication information indicates that the wireless device is in an awake state. When the wireless device is in the awake state, communication frame transmission can be performed on the first channel. For example, the second frame can be a NULL frame, and the third indication information can be carried in the PS field in the NULL frame. When the PS field includes a second identifier, it indicates that the wireless device can start communication frame transmission on the first channel. For example, the second identifier can be 0.

[0183] In some embodiments, the wireless device is a STA, and after sending the second frame, the wireless device may further receive a second confirmation frame for the second frame on the first channel, and the second confirmation frame may be an ACK frame. When the wireless device receives the second confirmation frame for the second frame on the first channel, the wireless device may perform steps 302 and 303.

[0184] In the embodiment of the present application, the adjusted second bandwidth is the bandwidth of the second channel for radar sensing of the wireless device. In some implementations, the main channel on the first channel is the same as the main channel on the second channel. In other words, when the wireless device adjusts the working bandwidth, the main channel is not changed.

[0185] 302. The wireless device transmits a communication frame on a first channel.

[0186] 303. The wireless device performs radar sensing on the second channel.

[0187] In some embodiments, the wireless device may transmit communication frames on the first channel and perform radar sensing on the second channel in a time-division manner. Before the wireless device transmits communication frames on the first channel, it needs to stop performing radar sensing on the second channel; before the wireless device performs radar sensing on the second channel, it needs to stop transmitting communication frames on the first channel. Figure 5b The timing diagram of a radar sensing process is shown in the figure. Figure 5b The horizontal axis in the middle represents time. After a radar sensing operation is performed on the second channel, radar sensing is stopped and communication frame transmission is performed on the first channel. Before starting the next radar sensing operation on the second channel, communication frame transmission on the first channel needs to be stopped.

[0188] 304. The wireless device adjusts the working bandwidth from the second bandwidth to the first bandwidth.

[0189] In the case where the radar sensing service needs to be turned off, the wireless device adjusts the working bandwidth from the second bandwidth to the first bandwidth to save bandwidth resources. As an example, after performing multiple radar sensing processes, the radar sensing service can be turned off and the working bandwidth can be adjusted from the second bandwidth to the first bandwidth. As another example, the wireless device can adjust the working bandwidth from the second bandwidth to the first bandwidth after each radar sensing process.

[0190] In some implementations, in order to avoid packet loss caused by other devices still sending communication frames to the wireless device on the first channel during the period when the wireless device adjusts the working bandwidth, before the wireless device adjusts the working bandwidth from the second bandwidth to the first bandwidth, the wireless device sends a third frame on the first channel, and the third frame includes the first indication information or the second indication information. The first indication information and the second indication information are respectively described by examples below:

[0191] Exemplarily, the first indication information is used to instruct the wireless device to stop transmitting communication frames on the first channel. Exemplarily, the first indication information instructs the wireless device to enter a sleep state. For example, the third frame may be a NULL frame, and the first indication information may be carried in a PS field in the NULL frame. When the PS field includes a first identifier, the wireless device is instructed to stop transmitting communication frames on the first channel. For example, the first identifier may be 1.

[0192] Exemplarily, the second indication information is used to indicate the time when the wireless device occupies the first channel. Exemplarily, the second indication information may indicate the end time when the wireless device occupies the first channel. Before the end time when the wireless device occupies the first channel, the wireless device stops transmitting communication frames on the first channel. Accordingly, other devices will not send communication frames to the wireless device before the end time when the wireless device occupies the first channel, thereby avoiding packet loss problems. As an example, the end time when the wireless device occupies the first channel is the completion time when the wireless device adjusts the working bandwidth from the second bandwidth to the first bandwidth. As another example, the end time when the wireless device occupies the first channel may be after the completion time when the wireless device adjusts the working bandwidth from the second bandwidth to the first bandwidth. For example, the third frame may be a Self-CTS frame, and the second indication information may be carried in the NAV in the Self-CTS frame, and the value of the NAV must at least indicate the completion time when the wireless device adjusts the working bandwidth from the second bandwidth to the first bandwidth.

[0193] In some embodiments, the wireless device is a STA, and after sending the third frame, the wireless device may further receive a third confirmation frame for the third frame on the first channel, and the third confirmation frame may be an ACK frame. When the wireless device receives the third confirmation frame for the third frame on the first channel, the wireless device adjusts the working bandwidth from the second bandwidth to the first bandwidth.

[0194] In some implementations, after the wireless device adjusts the working bandwidth from the second bandwidth to the first bandwidth, the wireless device sends a fourth frame on the first channel, and the fourth frame includes third indication information, and the third indication information is used to indicate that the wireless device starts to transmit communication frames on the first channel. Exemplarily, the third indication information indicates that the wireless device is in an awake state. When the wireless device is in an awake state, communication frame transmission can be performed on the first channel. For example, the second frame can be a NULL frame, and the third indication information can be carried in the PS field in the NULL frame. When the PS field includes a second identifier, it indicates that the wireless device can start to transmit communication frames on the first channel. For example, the second identifier can be 0.

[0195] In some embodiments, the wireless device is a STA, and after sending the fourth frame, the wireless device may further receive a fourth confirmation frame for the fourth frame on the first channel, and the fourth confirmation frame may be an ACK frame. When the wireless device receives the fourth confirmation frame for the fourth frame on the first channel, the wireless device may perform communication frame transmission on the first channel.

[0196] In this embodiment, the communication frame transmission is still transmitted on the first channel, and radar perception is performed on the second channel after the bandwidth is widened, thereby maximizing the radar perception performance and minimizing the impact on the communication frame transmission.

[0197] Combine the following Figure 5b and Figure 5c right Figure 5a To illustrate, in Figure 5b In the example, the first, second, third and fourth frames are NULL frames. Figure 5c The first frame, the second frame, the third frame and the fourth frame are taken as Self-CTS frames as an example.

[0198] like Figure 5b As shown, it is a schematic diagram of a working bandwidth adjustment provided by an embodiment of the present application, in Figure 5b All radar sensing operations visible to the air interface are performed within the radar sensing process. The communication frame transmission of this embodiment can exist within the T4 time between two adjacent radar sensing processes, or it can exist within the radar sensing process. The value range of T4 can depend on specific business requirements.

[0199] There is a radar service startup process before all radar sensing processes. In the radar service startup process, the wireless device first sends a NULL frame with a PS bit equal to 1. After the wireless device receives an ACK frame replied by the associated AP, the wireless device reconfigures the wireless device to work on a larger bandwidth while ensuring that the first channel used for communication frame transmission remains unchanged. The bandwidth of the first channel can be the first bandwidth, for example, the adjusted working bandwidth is the second bandwidth. After the wireless device adjusts the working bandwidth from the first bandwidth to the second bandwidth, it sends a NULL frame with a PS bit equal to 0, and the wireless device receives an ACK frame replied by the associated AP.

[0200] If the radar sensing function needs to be terminated, the wireless device starts the radar service shutdown process after all radar sensing processes. In the process, the wireless device first sends a NULL frame with the PS bit equal to 1. After the wireless device receives the ACK frame replied by the associated AP, it restores to the original first bandwidth while ensuring that the first channel used for communication frame transmission remains unchanged, that is, the wireless device adjusts the working bandwidth from the second bandwidth to the first bandwidth. After the bandwidth is adjusted, the wireless device sends a NULL frame with the PS bit equal to 0 again, and the wireless device receives the ACK frame replied by the associated AP.

[0201] The Self-CTS in the radar sensing operation of the embodiment of the present application must cover the entire newly configured working bandwidth, that is, the second bandwidth, in the form of non-high throughput duplication (Non-HighThroughout, Non-HT duliplicate). For example, when the bandwidth of the first channel is 80MHz during communication frame transmission, the adjusted second bandwidth is 160MHz, and the Self-CTS frame sent by the wireless device occupies 160MHz.

[0202] like Figure 5c As shown, it is a schematic diagram of a working bandwidth adjustment provided by an embodiment of the present application, in Figure 5c All radar sensing operations visible to the air interface are performed within the radar sensing process. The communication frame transmission of this embodiment can exist within the T4 time between two adjacent radar sensing processes, or it can exist within the radar sensing process. The value range of T4 can depend on specific business requirements.

[0203] There is a radar service startup process before all radar sensing processes. In the radar service startup process, the wireless device first sends a first Self-CTS frame. The NAV in the first Self-CTS frame must at least protect the completion time of the wireless device adjusting the working bandwidth from the first bandwidth to the second bandwidth. After the wireless device sends the first Self-CTS frame, it adjusts the working bandwidth from the first bandwidth to the second bandwidth.

[0204] If the radar sensing function needs to be terminated, the wireless device starts the radar service shutdown process after all radar sensing processes. In the process, the wireless device sends a third Self-CTS frame. The NAV in the third Self-CTS frame must at least protect the completion time of the wireless device adjusting the working bandwidth from the second bandwidth to the first bandwidth. After the wireless device sends the third Self-CTS frame, the wireless device adjusts the working bandwidth from the second bandwidth to the first bandwidth. The wireless device can continue to transmit communication frames on the first bandwidth.

[0205] The second Self-CTS in the radar sensing operation of the embodiment of the present application must cover the entire newly configured working bandwidth, that is, the second bandwidth, in the form of Non-HT duliplicate. For example, when the communication frame is transmitted, the bandwidth of the first channel is 80 MHz, and the adjusted second bandwidth is 160 MHz. The second Self-CTS frame sent by the wireless device occupies 160 MHz.

[0206] Figure 5b and Figure 5c The value range of T1 can be 50~500us. The starting time difference between two radar sensing operations is T2, and the value range of T2 can be 1~10ms. The duration of all radar sensing operations in a radar sensing process is T3, and the value range of T3 can be 50us~1000ms. For the definition of T1, T2, and T3, please refer to the above Figure 2b The description of the embodiments will not be repeated here.

[0207] The following is an introduction to the communication device provided in the embodiments of the present application.

[0208] The present application divides the functional modules of the communication device according to the above method embodiment. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or software functional modules. It should be noted that the division of modules in the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. Figures 6 to 8 The communication device according to the embodiment of the present application is described in detail.

[0209] Figure 6 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application, such as Figure 6 As shown, the communication device 1000 can correspondingly implement the functions or steps implemented by the wireless device in the above-mentioned various method embodiments. The communication device may include a processing unit 1200 and a transceiver unit 1100. Optionally, a storage unit may also be included, which can be used to store instructions (codes or programs) and / or data. The processing unit 1200 and the transceiver unit 1100 can be coupled to the storage unit. For example, the processing unit 1200 can read the instructions (codes or programs) and / or data in the storage unit to implement the corresponding method. The above-mentioned units can be independently set or partially or fully integrated. For example, the transceiver unit 1100 may include a sending unit and a receiving unit. The sending unit may be a transmitter, and the receiving unit may be a receiver. The entity corresponding to the transceiver unit 1100 may be a transceiver.

[0210] In some possible implementations, the communication device 1000 can implement the behaviors and functions of the wireless device in the above method embodiments. For example, the communication device 1000 can be a wireless device, or a component (such as a chip or circuit) used in a wireless device. The transceiver unit 1100 can be used to perform Figure 3 , Figure 4a , Figure 5a The processing unit 1200 is used to execute all operations except the receiving and sending operations performed by the wireless device.

[0211] In one possible design, the communication device 1000 includes: a processing unit 1200 and a transceiver unit 1100.

[0212] The transceiver unit 1100 is used to transmit communication frames on the first channel and to perform radar sensing on the second channel;

[0213] Before the transceiver unit 1100 transmits the communication frame on the first channel, it stops performing radar sensing on the second channel; or, before the transceiver unit 1100 performs radar sensing on the second channel, it stops performing communication frame transmission on the first channel.

[0214] In a possible implementation manner, the communication device further includes:

[0215] The processing unit 1200 is configured to switch from the first channel to the second channel;

[0216] The first channel and the second channel are different channels supported by the wireless device.

[0217] In a possible implementation manner, the first channel is a busy channel detected by the wireless device, and the second channel is an idle channel detected by the wireless device.

[0218] In a possible implementation, the processing unit 1200 is further configured to switch from the second channel to the first channel;

[0219] The transceiver unit 1100 is further configured to continue transmitting communication frames on the first channel.

[0220] In a possible implementation, a radar sensing process includes one or more cyclic processes, and the multiple cyclic processes are continuous in time;

[0221] A cyclic process includes a process of switching from the first channel to the second channel, performing radar sensing on the second channel, and switching from the second channel to the first channel;

[0222] The radar sensing process is a process including a preset number of radar sensing operations, the time interval between two adjacent radar sensing operations in the preset number of radar sensing operations is a first time interval, and the radar sensing operation includes sending a self-clearing Self-CTS frame and sending a radar signal associated with the Self-CTS frame.

[0223] In a possible implementation manner, the second channel includes the first channel, and a bandwidth of the second channel is greater than a bandwidth of the first channel.

[0224] In a possible implementation manner, a main channel on the first channel and a main channel on the second channel are the same.

[0225] In a possible implementation, the processing unit 1200 is also used to adjust the working bandwidth of the wireless device from a first bandwidth to a second bandwidth when it is necessary to start a radar sensing service, where the first bandwidth is the bandwidth of the first channel and the second bandwidth is the bandwidth of the second channel.

[0226] In a possible implementation, the transceiver unit 1100 is further configured to send a first frame on the first channel, where the first frame includes first indication information; the first indication information is used to instruct the wireless device to stop transmitting communication frames on the first channel; or,

[0227] The first frame includes second indication information, and the second indication information is used to indicate the time for which the wireless device occupies the first channel. Before the end time of the wireless device occupying the first channel, the wireless device stops transmitting communication frames on the first channel.

[0228] In a possible implementation manner, the wireless device is a station STA, and the transceiver unit 1100 is specifically configured to receive a first confirmation frame for the first frame on the first channel.

[0229] In a possible implementation, the transceiver unit 1100 is further used to send a second frame on the first channel, where the second frame includes third indication information, and the third indication information is used to instruct the wireless device to start communication frame transmission on the first channel.

[0230] In a possible implementation manner, the transceiver unit 1100 is further configured to receive a second confirmation frame for the second frame on the first channel.

[0231] In a possible implementation, the end time of the wireless device occupying the first channel is the time when the wireless device switches from the second channel to the first channel, or the end time of the wireless device occupying the first channel is after the time when the wireless device switches from the second channel to the first channel.

[0232] In a possible implementation, the end time of the wireless device occupying the first channel is the completion time of the wireless device adjusting the working bandwidth from the first bandwidth to the second bandwidth, or the end time of the wireless device occupying the first channel is after the completion time of the wireless device adjusting the working bandwidth from the first bandwidth to the second bandwidth.

[0233] In a possible implementation, the processing unit 1200 is further configured to adjust the working bandwidth from the second bandwidth to the first bandwidth when it is necessary to stop the radar sensing service.

[0234] Figure 6 The specific description and beneficial effects of the illustrated device embodiment can be referred to the description of the aforementioned method embodiment, which will not be repeated here.

[0235] The wireless device of the embodiment of the present application is described above, and the possible product forms of the wireless device are described below. It should be understood that any wireless device having the above Figure 6 Any product having the functions of the wireless device described above, or any product having the functions of the wireless device described above Figure 6 Any form of product with the functions of the wireless device described above falls within the protection scope of the embodiments of the present application. It should also be understood that the following description is only an example and does not limit the product form of the wireless device of the embodiments of the present application to this.

[0236] In one possible implementation, Figure 6 In the communication device shown, the processing unit 1200 may be one or more processors, the transceiver unit 1100 may be a transceiver, or the transceiver unit 1100 may also be a sending unit and a receiving unit, the sending unit may be a transmitter, the receiving unit may be a receiver, and the sending unit and the receiving unit are integrated into one device, such as a transceiver. In the embodiment of the present application, the processor and the transceiver may be coupled, etc., and the embodiment of the present application does not limit the connection method between the processor and the transceiver.

[0237] Figure 7 A schematic diagram of the structure of another communication device 2000 provided in an embodiment of the present application.

[0238] like Figure 7As shown, the communication device 2000 includes one or more processors 2200 and a transceiver 2100. The transceiver 2100 can implement the function of the transceiver unit 1100, and the processor 2200 can implement the function of the processing unit 1200.

[0239] exist Figure 7 In various implementations of the communication device shown, the transceiver may include a receiver and a transmitter, wherein the receiver is used to perform a receiving function (or operation) and the transmitter is used to perform a transmitting function (or operation). The transceiver is used to communicate with other devices / devices through a transmission medium.

[0240] Optionally, the communication device 2000 may also include one or more memories 2300 for storing program instructions and / or data. The memory 2300 is coupled to the processor 2200. The coupling in the embodiment of the present application is an indirect coupling or communication connection between devices, units or modules, which may be electrical, mechanical or other forms, and is used for information exchange between devices, units or modules. The processor 2200 may operate in conjunction with the memory 2300. The processor 2200 may execute program instructions stored in the memory 2300.

[0241] The specific connection medium between the transceiver 2100, the processor 2200 and the memory 2300 is not limited in the embodiment of the present application. Figure 7 The transceiver 2100, the processor 2200 and the memory 2300 are connected via a bus 2400. Figure 7 The connections between the other components are shown in bold lines, which are only for illustration and are not intended to be limiting. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 7 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0242] In the embodiments of the present application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc., and may implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor, etc.

[0243] In the embodiment of the present application, the memory may include, but is not limited to, non-volatile memory such as a hard disk drive (HDD) or a solid-state drive (SSD), a random access memory (RAM), an erasable programmable read-only memory (EPROM), a read-only memory (ROM) or a portable read-only memory (CD-ROM), etc. The memory is any storage medium that can be used to carry or store program codes in the form of instructions or data structures and can be read and / or written by a computer (such as a communication device shown in the present application), but is not limited thereto. The memory in the embodiment of the present application can also be a circuit or any other device that can realize a storage function, for storing program instructions and / or data.

[0244] The processor 2200 is mainly used to process the communication protocol and communication data, and to control the entire communication device, execute the software program, and process the data of the software program. The memory 2300 is mainly used to store the software program and data. The transceiver 2100 may include a control circuit and an antenna. The control circuit is mainly used to convert the baseband signal and the radio frequency signal and to process the radio frequency signal. The antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves. The input and output devices, such as a touch screen, a display screen, a keyboard, etc., are mainly used to receive data input by the user and output data to the user.

[0245] When the communication device is turned on, the processor 2200 can read the software program in the memory 2300, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor 2200 performs baseband processing on the data to be sent, and outputs the baseband signal to the RF circuit. The RF circuit performs RF processing on the baseband signal and then sends the RF signal outward in the form of electromagnetic waves through the antenna. When data is sent to the communication device, the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor 2200. The processor 2200 converts the baseband signal into data and processes the data.

[0246] In another implementation, the RF circuit and antenna may be arranged independently of the processor performing baseband processing. For example, in a distributed scenario, the RF circuit and antenna may be arranged remotely from the communication device.

[0247] It is understandable that the communication device shown in the embodiment of the present application may also have Figure 7The embodiments of the present application do not limit the number of components and the like. The methods executed by the processor and the transceiver shown above are only examples, and the specific steps executed by the processor and the transceiver can refer to the methods described above.

[0248] In another possible implementation, Figure 6 In the communication device shown, the processing unit 1200 may be one or more logic circuits, and the transceiver unit 1100 may be an input / output interface, or a communication interface, or an interface circuit, or an interface, etc. Alternatively, the transceiver unit 1100 may be a sending unit and a receiving unit, the sending unit may be an output interface, the receiving unit may be an input interface, and the sending unit and the receiving unit may be integrated into one unit, such as an input / output interface. Figure 8 As shown, Figure 8 The communication device shown includes a logic circuit 3001 and an interface 3002. That is, the processing unit 1200 can be implemented by the logic circuit 3001, and the transceiver unit 1100 can be implemented by the interface 3002. The logic circuit 3001 can be a chip, a processing circuit, an integrated circuit or a system on chip (SoC) chip, etc., and the interface 3002 can be a communication interface, an input / output interface, a pin, etc. For example, Figure 8 The above communication device is used as an example of a chip, and the chip includes a logic circuit 3001 and an interface 3002 .

[0249] In the embodiment of the present application, the logic circuit and the interface may also be coupled to each other. The embodiment of the present application does not limit the specific connection method between the logic circuit and the interface.

[0250] It can be understood that the communication device shown in the embodiment of the present application can implement the method provided in the embodiment of the present application in the form of hardware, or can implement the method provided in the embodiment of the present application in the form of software, etc., and the embodiment of the present application is not limited to this.

[0251] An embodiment of the present application further provides a wireless communication system, which includes an AP and a STA. The AP and the STA can be used to execute the method in any of the foregoing embodiments.

[0252] In addition, the present application also provides a computer-readable storage medium, which stores computer code. When the computer code runs on a computer, the computer executes the operations and / or processing performed by the wireless device in the method provided by the present application.

[0253] The present application also provides a computer program product, which includes a computer code or a computer program. When the computer code or the computer program runs on a computer, the operations and / or processing performed by the wireless device in the method provided by the present application are executed.

[0254] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, or it can be an electrical, mechanical or other form of connection.

[0255] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the technical effects of the solutions provided in the embodiments of the present application.

[0256] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0257] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or partly contributed to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a readable storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned readable storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program code.

[0258] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A channel switching method, characterized in that: include: The wireless device performs communication frame transmission on a first channel and performs radar sensing on a second channel; Before the wireless device transmits a communication frame on the first channel, it stops performing radar sensing on the second channel; or, before the wireless device performs radar sensing on the second channel, it stops performing communication frame transmission on the first channel.

2. The method according to claim 1, characterized in that Before performing radar sensing on the second channel, the method further includes: The wireless device switches from the first channel to the second channel; The first channel and the second channel are different channels supported by the wireless device.

3. The method according to claim 2, characterized in that The first channel is a busy channel detected by the wireless device, and the second channel is an idle channel detected by the wireless device.

4. The method according to claim 2 or 3, characterized in that After performing radar sensing on the second channel, the method further includes: The wireless device switches from the second channel to the first channel and continues to transmit communication frames on the first channel.

5. The method according to any one of claims 2 to 4, characterized in that: A radar sensing process includes one or more loop processes, and the multiple loop processes are continuous in time; A cyclic process includes a process of switching from the first channel to the second channel, performing radar sensing on the second channel, and switching from the second channel to the first channel; The radar sensing process is a process including a preset number of radar sensing operations, the time interval between two adjacent radar sensing operations in the preset number of radar sensing operations is a first time interval, and the radar sensing operation includes sending a self-clearing Self-CTS frame and sending a radar signal associated with the Self-CTS frame.

6. The method according to claim 1, characterized in that The second channel includes the first channel, and a bandwidth of the second channel is greater than a bandwidth of the first channel.

7. The method according to claim 6, characterized in that A primary channel on the first channel and a primary channel on the second channel are the same.

8. The method according to claim 6 or 7, characterized in that The wireless device transmits a communication frame on the first channel and, before performing radar sensing on the second channel, further includes: When the radar sensing service needs to be started, the wireless device adjusts the working bandwidth from the first bandwidth to the second bandwidth, where the first bandwidth is the bandwidth of the first channel and the second bandwidth is the bandwidth of the second channel.

9. The method according to any one of claims 2 to 5 or 8, characterized in that: Before the wireless device switches from the first channel to the second channel, or before the wireless device adjusts the working bandwidth from the first bandwidth to the second bandwidth, the method further includes: The wireless device sends a first frame on the first channel, wherein the first frame includes first indication information; the first indication information is used to instruct the wireless device to stop transmitting communication frames on the first channel; or, The first frame includes second indication information, and the second indication information is used to indicate the time for which the wireless device occupies the first channel. Before the end time of the wireless device occupying the first channel, the wireless device stops transmitting communication frames on the first channel.

10. The method according to claim 9, characterized in that The wireless device is a station STA, and the method further includes: The wireless device receives a first acknowledgment frame for the first frame on the first channel.

11. The method according to claim 4 or 8, characterized in that: After the wireless device switches from the second channel to the first channel, or after the wireless device adjusts the working bandwidth from the first bandwidth to the second bandwidth, the method further includes: The wireless device sends a second frame on the first channel, wherein the second frame includes third indication information, and the third indication information is used to instruct the wireless device to start communication frame transmission on the first channel.

12. The method according to claim 11, characterized in that The wireless device is a station STA, and the method further includes: The wireless device receives a second acknowledgment frame for the second frame on the first channel.

13. The method according to claim 9, characterized in that The end time when the wireless device occupies the first channel is the time when the wireless device switches from the second channel to the first channel, or the end time when the wireless device occupies the first channel is after the time when the wireless device switches from the second channel to the first channel.

14. The method according to claim 9, characterized in that The end time when the wireless device occupies the first channel is the completion time when the wireless device adjusts the working bandwidth from the first bandwidth to the second bandwidth, or the end time when the wireless device occupies the first channel is after the completion time when the wireless device adjusts the working bandwidth from the first bandwidth to the second bandwidth.

15. The method according to any one of claims 8 to 14, characterized in that: The method further comprises: In the case where the radar sensing service needs to be stopped, the wireless device adjusts the working bandwidth from the second bandwidth to the first bandwidth.

16. A communication device, characterized in that: Comprising means for performing the method as claimed in any one of claims 1 to 15.

17. A communication device, characterized in that: Including processors; The processor is coupled to a memory; The memory is used to store instructions; The processor is configured to execute the instructions so that the method according to any one of claims 1 to 15 is performed.

18. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store a computer program or instruction. When the computer program or instruction is executed, the method according to any one of claims 1 to 15 is executed.

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