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420 results about "Personal area network" patented technology

A personal area network (PAN) is a computer network for interconnecting devices centered on an individual person's workspace. A PAN provides data transmission among devices such as computers, smartphones, tablets and personal digital assistants. PANs can be used for communication among the personal devices themselves, or for connecting to a higher level network and the Internet where one master device takes up the role as gateway. A PAN may be wireless or carried over wired interfaces such as USB.

Stream classification service-based communication method and apparatus

A stream classification service-based communication method and an apparatus are applied to a wireless local area network system that supports 802.11 series protocols, for example, a next-generation Wi-Fi protocol of IEEE 802.11ax, such as 802.11be, Wi-Fi 7, or EHT, or for another example, a next-generation protocol of 802.11be, Wi-Fi 8, or UHR, and can be further applied to a UWB-based wireless personal area network system, a sensing system, and the like. The method includes: a receiving end sends a measurement request, and correspondingly, a transmitting end receives the measurement request. The measurement request includes an identifier of a stream classification service (SCS) stream. The transmitting end sends a measurement report, and correspondingly, the receiving end receives the measurement report. The measurement report includes the identifier of the SCS stream and QoS measurement data of the SCS stream.
Owner:HUAWEI TECH CO LTD

Systems and methods for accident detection and notification

Systems and methods for accident detection and notification are described. In some embodiments, an Information Handling System (IHS) may include: an Embedded Controller (EC); and a memory coupled to, or integrated into, the EC, where the memory includes program instructions that, upon execution by the EC, cause the EC to: receive sensor data from a sensor; determine, based at least in part on the sensor data, that an accident occurred to the IHS; and in response to the determination, issue a notification. In some embodiments, to issue the notification, the program instructions, upon execution, further cause the EC to: transmit information to a second IHS via a personal area network (PAN).
Owner:DELL PROD LP

Communication method based on physical layer protocol data unit and apparatus

Disclosed are a communication method based on a PPDU and an apparatus. This application is applied to a wireless local area network system that supports 802.11 series protocols such as a next-generation Wi-Fi protocol of IEEE 802.11ax, for example, 802.11be, Wi-Fi 7, or EHT, and a next-generation Wi-Fi protocol of 802.11be or Wi-Fi 8, and may be further applied to a UWB-based wireless personal area network system, a sensing (sensing) system, and the like. The method includes: A transmit end generates the PPDU, and sends the PPDU. Correspondingly, a receive end receives the PPDU, and processes the PPDU. The PPDU may include an L-STF, an L-LTF, an L-SIG field, and a first STF.
Owner:HUAWEI TECH CO LTD

Audio playback management of multiple concurrent connections

Examples described herein relate to management of concurrent audio streams from different sources. Portable playback devices, such as wearable wireless headphones and earbuds, as well as portable battery-powered speakers, may include multiple network interfaces for connection to different types of networks, such as an 802.11-compatible network interface for connection to wireless local area networks (e.g., Wi-Fi® networks) and an 802.15-compatible network interface for connection to a mobile device via a personal area network (Bluetooth®). Via such connections, the playback devices may receive two or more concurrent streams. By managing these streams according to playback policies, the portable playback devices may play the user's intended audio without necessarily requiring user input to explicitly select among the concurrent streams.
Owner:SONOS INC

Communication method and communication device

The embodiment of the invention provides a communication method, which is applied to a wireless local area network system supporting an IEEE (Institute of Electrical and Electronic Engineers) 802.11 ax next generation Wi-Fi protocol, such as 802.11 be, Wi-Fi 7 or EHT, and then 802.11 series protocols such as 802.11 be next generation, Wi-Fi 8, UHR, Wi-Fi AI and the like, and can also be applied to a wireless personal local area network system and a sensing system based on UWB (Ultra Wideband). The method comprises the following steps: inputting a high-frequency constellation mapping symbol into a subcarrier mapper; and the subcarrier mapper is used for reordering the high-frequency constellation mapping symbols. For communication transmission in a high-frequency band scene, an appropriate subcarrier mapper can be designed, and constellation mapping symbols are reordered based on the subcarrier mapper.
Owner:HUAWEI TECH CO LTD

Communication method and communication device

The invention provides a communication method, which can be applied to a WLAN (Wireless Local Area Network) system supporting an IEEE 802.11 be next generation, Wi-Fi 8 and other 802.11 series protocols, and can also be applied to a UWB (Ultra Wideband)-based wireless personal area network system and a sensing system. The method comprises: in a scene of channel competition, before a certain station sends a delay signal indicating that other stations wait for a period of time and then perform channel competition, a CFO is calibrated according to a first PPDU finally received before the delay signal is sent. According to the embodiment of the invention, the CFO is calibrated based on the finally received PPDU, so that a plurality of delay signals cannot be normally received by other stations due to overlarge CFO deviation in a scene that the plurality of stations all send the delay signals.
Owner:HUAWEI TECH CO LTD

Communication method and communication device

The invention provides a communication method, which can be applied to a WLAN (Wireless Local Area Network) system supporting an IEEE (Institute of Electrical and Electronic Engineers) 802.11 ax next-generation Wi-Fi (Wireless Fidelity) protocol, such as 802.11 be, Wi-Fi 7 or EHT, and then 802.11 series protocols, such as 802.11 be next-generation, Wi-Fi 8 and the like, can also be applied to IEEE 802.11 bf and a next-generation protocol thereof, and can also be applied to a UWB (Ultra Wideband)-based wireless personal area network system, a sensing system and the like. The method comprises the following steps: in a scene in which a multi-link device participates in proxy sensing measurement, a proxy sensing initiating end sends a request message for requesting to establish proxy sensing measurement to a proxy sensing response end, and the request message comprises first indication information for indicating a link mapped by a first sensing response end. By carrying the information indicating the link in the request message, proxy sensing measurement is established under the scene that the multi-link equipment participates in proxy sensing.
Owner:HUAWEI TECH CO LTD

Phase determination method and device

The invention discloses a phase determination method and device, and is applied to the technical field of communication, for example, the phase determination method and device are applied to a WPAN (Wireless Personal Area Network) system based on UWB (Ultra Wideband), such as an 802.15. 4a protocol, an 802.15. 4 z protocol or an 802.15. 4 ab protocol and the like in 802.15 series protocols, and are also applied to a sensing system and the like. The method comprises the following steps: after generating a first frame, a sending end sends the first frame; thereby, a receiving end may receive the first frame and determine phase information based on the first frame. Wherein the first frame can comprise a first CTS, the first CTS comprises at least two fragment groups, the time interval between adjacent fragments in each fragment group is a first time interval, and the time interval between adjacent fragment groups is a second time interval. And the coverage range of the first frame is effectively improved.
Owner:HUAWEI TECH CO LTD

External hanging type motion sensing control system and motion sensing control method for shooting games and training

The invention discloses an external hanging type motion sensing control system for shooting games and training. The external hanging type motion sensing control system comprises a data acquisition module, a data processing module, a power management module, an output display module, a personal area network interaction module and a cloud service module. The data acquisition module is used for acquiring data required for resolving the spatial attitude of a user through a sensor; the data processing module processes the collected sensor data, maps the sensor data into the actual state and operation of a user, and stores and manages user-defined control parameters; the power supply management module is used for supplying power to the somatosensory control equipment and managing the power supply of the somatosensory control equipment; the output display module is used for displaying the state information of the somatosensory control equipment; the personal area network interaction module is used for communication and information interaction; and the cloud service module is used for a user to customize sensor parameter mapping and equipment information management through a mobile phone. The invention further provides a somatosensory control method which has a wide application scene.
Owner:EAST CHINA NORMAL UNIV

Communication method and communication apparatus

This application provides a communication method and apparatus. In the method, a first symbol set is introduced into a protocol data unit, to provide sufficient switching time for a Wi-Fi device to switch from a first running mode to a second running mode. This ensures data receiving performance of the Wi-Fi device. This application is applied to a wireless local area network system that supports 802.11 series protocols such as a next-generation Wi-Fi protocol of IEEE 802.11ax like 802.11be, Wi-Fi 7, or an extremely high throughput (EHT), a next-generation protocol of 802.11be like Wi-Fi 8, and Wi-Fi AI; and is alternatively applied to a UWB-based wireless personal area network system, a sensing system, or the like.
Owner:HUAWEI TECH CO LTD

Communication method and device and computer readable storage medium

The embodiment of the invention relates to the field of communication, in particular to a communication method and device and a computer readable storage medium, which can be applied to a sensing system and can also be applied to a system conforming to IEEE (Institute of Electrical and Electronic Engineers) 802.11 system standards, such as 802.11 bf, 802.11 ax, 802.11 be or next generation standards, or a wireless personal local area network system based on UWB (Ultra-Wideband). The method comprises the following steps: a first device obtains first information, wherein the first information comprises sensing information of at least one third device capable of sensing switching with a second device; and the first device sends the first information to the second device. According to the communication method provided by the embodiment of the invention, the efficiency of sensing the switching process can be improved.
Owner:HUAWEI TECH CO LTD

Communication method and communication device

The invention provides a communication method, which can be applied to a WLAN (Wireless Local Area Network) system supporting an IEEE (Institute of Electrical and Electronic Engineers) 802.11 ax next generation Wi-Fi protocol, such as 802.11 be, Wi-Fi 7 or EHT, and then 802.11 series protocols such as 802.11 be next generation, Wi-Fi 8 and the like, and can also be applied to a UWB (Ultra Wideband)-based wireless personal area network system and a sensing system. The method comprises the steps that a source MLD obtains information of a relay MLD through a low-frequency communication link, the relay MLD is set through the low-frequency communication link, and therefore information can be transmitted to a target MLD through the relay MLD on a high-frequency communication link, and relay transmission is achieved. According to the communication method, the source MLD obtains the information of the relay MLD through the low frequency, and the relay MLD is set through the low frequency, so that the low frequency assists the high frequency to establish the relay transmission, the relay transmission establishment overhead is reduced, and the relay transmission performance is improved.
Owner:HUAWEI TECH CO LTD

Information interaction method and device in UWB system

The invention relates to an information interaction method and device in a UWB system, and the method comprises the steps: enabling two communication parties to interact a control message, which is used for indicating a frequency band overlapping rate between adjacent channels in a channel set for frequency band splicing; when the frequency band overlapping ratio belongs to the overlapping ratio set S1, the channel set is a sequential channel; and when the frequency band overlapping rate belongs to the overlapping rate set S2, the channel set is an out-of-order channel. According to the invention, better compromise between the transmission time and the transmission power in the frequency band splicing process can be realized. The application is applied to a WPAN (Wireless Personal Area Network) system, a sensing system and the like based on UWB (Ultra Wideband), and comprises 802.15 series protocols, such as 802.15. 4 ab or a next-generation system thereof and the like. The method can be applied to a WLAN (Wireless Local Area Network) system of 802.11 series protocols such as a 802.11 ax next-generation protocol, such as 802.11 be or EHT (Evolved Huang Transform), a 802.11 be next-generation protocol, Wi-Fi (Wireless Fidelity) 8, UHR (Ultra High Ratio), Wi-Fi AI (Wireless Fidelity) and the like.
Owner:HUAWEI TECH CO LTD

Multi-link communication method and multi-link device

The invention provides a multi-link communication method and multi-link equipment, which are applied to a wireless local area network system supporting IEEE (Institute of Electrical and Electronic Engineers) 802.11 ax next generation Wi-Fi (Wireless Fidelity) protocols, such as 802.11 be and Wi-Fi 7, and then 802.11 be next generation, such as Wi-Fi 8 and the like, and can also be applied to a wireless personal local area network system based on ultra-bandwidth. The method comprises: a first multi-link device sends a wireless frame comprising indication information to a second multi-link device, the indication information being used for indicating that the first multi-link device supports a cross-link capability, the second multi-link device can determine that the first multi-link device supports the cross-link capability based on the indication information, and further, the second multi-link device determines that the first multi-link device supports the cross-link capability. The first multi-link device and the second multi-link device can carry out more effective uplink and downlink service transmission on a high frequency band based on the cross-link capability supported by the first multi-link device.
Owner:HUAWEI TECH CO LTD

Communication method and communication device

The invention provides a communication method, which can be applied to a WLAN (Wireless Local Area Network) system supporting an IEEE (Institute of Electrical and Electronic Engineers) 802.11 ax next generation Wi-Fi protocol, such as 802.11 be, Wi-Fi 7 or EHT, and then 802.11 series protocols such as 802.11 be next generation, Wi-Fi 8 and the like, and can also be applied to a UWB (Ultra Wideband)-based wireless personal area network system and a sensing system. The method comprises the following steps: a first station determines that a plurality of first PPDUs need to be sent to a second station through a high-frequency communication link for beam training, receives a first stop frame through a low-frequency communication link after the first station sends part of the first PPDUs, and stops sending the unsent first PPDUs in response to the first stop frame. The transmission of the PPDU in the beam training process is actively stopped through the low-frequency link transmission stop frame, and the beam training efficiency is improved.
Owner:HUAWEI TECH CO LTD

Information interaction method and device in UWB system

The invention relates to an information interaction method and device in a UWB system, and the method comprises the steps: transmitting / receiving perception control information, determining a channel based on the perception control information, and enabling the channel to meet a predefined condition. By adopting the method and the device, a sensing scheme, such as sensing measurement based on frequency band splicing, can be perfected, and the sensing performance is improved. The application is applied to a WPAN (Wireless Personal Area Network) system, a sensing system and the like based on UWB (Ultra Wideband), and comprises 802.15 series protocols, such as 802.15. 4 ab or a next-generation system thereof and the like. The method can be applied to a WLAN (Wireless Local Area Network) system, and can also be applied to a next-generation protocol (such as 802.11 be, Wi-Fi 7 or EHT) of 802.11 ax, or a next-generation protocol (such as Wi-Fi 8, UHR and 11bn) of 802.11 be, or Wi-Fi AI, millimeter wave and the like.
Owner:HUAWEI TECH CO LTD

Communication method, communication device and communication system

A communication method, a communication device and a communication system are applied to a wireless local area network system supporting an IEEE 802.11 ax next generation Wi-Fi protocol, such as 802.11 be, Wi-Fi 7 or EHT, and 802.11 series protocols, such as 802.11 bn or Wi-Fi 8, 802.11 ay and 802.11 aj, of the 802.11 be next generation, and can also be applied to a UWB-based wireless personal local area network system, a sensing system and the like. A first communication device generates a PPDU and sends the PPDU, and correspondingly, a second communication device receives the PPDU and analyzes the PPDU. Wherein the bandwidth used for transmitting the PPDU can comprise 128 subcarriers, and the number of pilot frequency subcarriers in the 128 subcarriers is larger than 6. According to the method, the packet error rate is effectively reduced.
Owner:HUAWEI TECH CO LTD

Communication method and communication device

The invention provides a communication method and device, and the method can be applied to a WLAN system which supports an IEEE 802.11 ax next generation Wi-Fi protocol, such as 802.11 be, Wi-Fi 7 or EHT, and then 802.11 series protocols such as 802.11 be next generation, Wi-Fi 8 and the like, and can also be applied to a UWB-based wireless personal area network system, a sensing system and the like. The method comprises the following steps: a sending end generates a physical layer protocol data unit (PPDU) and sends the PPDU to a receiving end; wherein the PPDU comprises a first field, the first field is used for bearing a first sequence, the first sequence is used for a receiving end to perform channel estimation, the first sequence corresponds to a first bandwidth, and the first bandwidth is greater than 320 MHz. According to the scheme, the channel estimation sequence corresponding to the bandwidth larger than 320 MHz is designed to support signal transmission in a large-bandwidth (such as 640 MHz, 480 MHz and the like) scene.
Owner:HUAWEI TECH CO LTD

Communication method and device

A communication method and device are suitable for the technical field of communication, such as a wireless local area network system supporting an IEEE 802.11 ax next generation Wi-Fi protocol, such as 802.11 be, Wi-Fi 7 or EHT, a 802.11 be next generation, such as 802.11 bn or Wi-Fi 8 or UHR, and 802.11 series protocols such as an integrated millimeter wave (IMMW) protocol, and can also be applied to a UWB-based wireless personal local area network system, a sensing system and the like. The communication method may comprise the steps that a first communication device generates a PPDU and sends the PPDU; the second communication device then receives the PPDU and learns that the transmission mode of the PPDU is a partial bandwidth MU-MIMO transmission mode based on the PPDU. According to the method, the throughput rate of the user is effectively improved, and the transmission efficiency is improved.
Owner:HUAWEI TECH CO LTD

Communication method and device

The invention provides a communication method and device, which can be applied to a wireless personal local area network system based on an ultra wide band, including 802.15 series protocols, such as a 802.15. 4a protocol, a 802.15. 4 z protocol or a 802.15. 4 ab protocol and the like, and can also support a next generation Wi-Fi protocol of IEEE 802.11 ax, such as 802.11 be, Wi-Fi 7 or ultrahigh throughput, such as 802.11 b. The method comprises the following steps: a sending device sends a first signal to a receiving device, the first signal is used for indicating N bits, the value of each bit is determined by the high-low relationship between the average energy in two pulse burst intervals, and the receiving device determines to wake up the receiving device according to the first signal. According to the embodiment of the invention, the one-bit information is transmitted by adopting the two pulse burst intervals, and the receiving equipment can correctly demodulate the first signal, so that the receiving equipment can be effectively awakened.
Owner:HUAWEI TECH CO LTD

Communication method and apparatus

Embodiments of this application are applied to a wireless local area network system that supports 802.11 series protocols, for example, a next-generation Wi-Fi protocol of IEEE 802.11ax, such as 802.11be, Wi-Fi 7, or EHT, or for another example, a next-generation protocol of 802.11be or Wi-Fi 8, and may be further applied to an ultra-wideband UWB-based wireless personal area network system or a sensing (sensing) system. Embodiments of this application provide a communication method and apparatus. The method includes: generating a synchronization header field based on a sequence set, where the sequence set includes at least one of the following sequences: a sequence with a length of 127, a sequence with a length of 31, a sequence with a length of 91, or a sequence with a length of 64; and sending the synchronization header field.
Owner:HUAWEI TECH CO LTD

Communication method and related device

A communication method and a related device are applied to a wireless local area network system supporting an IEEE 802.11 ax next generation Wi-Fi protocol, such as 802.11 be, Wi-Fi 7 or EHT, such as 802.11 be next generation, Wi-Fi 8, UHR, Wi-Fi AI and other 802.11 series protocols, and can also be applied to an ultra-bandwidth-based wireless personal local area network system and a sensing system. The AP MLD sends at least one first frame on at least one first link; the first frame indicates the effective starting time of the service identifier and link mapping; when the service identifier and the link mapping indicate that the second link is closed, the time for closing the second link by the AP MLD is not earlier than the time point Tb; when the service identifier and the link mapping indicate that the second link is opened, the time for opening the second link by the AP MLD is not later than the time point Ta; ta is earlier than Tb. The communication reliability can be improved.
Owner:HUAWEI TECH CO LTD

Communication method and communication apparatus

This application relates to the communication field, and in particular, to a communication method and apparatus. This solution may be applied to a WLAN system that supports 802.11 series protocols, and may be further applied to a UWB-based wireless personal area network system and a sensing system. In the method, a first station of a first multi-link device exchanges a TDLS setup request frame and a TDLS setup response frame with a first station of a second multi-link device via a first access point. The TDLS setup request frame is used to request to set up a first TDLS direct link and a second TDLS direct link. In this way, a plurality of TDLS direct links can be set up between two multi-link devices. Because the plurality of links may be used to transmit information, communication efficiency can be improved.
Owner:HUAWEI TECH CO LTD

Communication method and device

A communication method and device are applied to a wireless local area network system supporting an IEEE 802.11 ax next generation Wi-Fi protocol, such as 802.11 be, Wi-Fi 7 or EHT, and 802.11 series protocols, such as 802.11 bn or Wi-Fi 8, 802.11 ay, 802.11 aj and the like, of the 802.11 be next generation, and can also be applied to a UWB-based wireless personal local area network system, a sensing system and the like. A first communication device generates and transmits a PPDU. The second communication device receives and analyzes the PPDU. A pilot frequency value carried by a pilot frequency subcarrier corresponding to a data field in the PPDU is determined based on a PPDU bandwidth and Nss group pilot frequency initial values, at least two groups of pilot frequency initial values in the Nss group pilot frequency initial values are different, and each group of pilot frequency initial values can comprise M pilot frequency initial values. And the utilization rate of the processing circuit is effectively improved.
Owner:HUAWEI TECH CO LTD

Angle of arrival of personal area network devices using a switched beam antenna

A method and apparatus for measuring the angle of arrival AOA of Classic Bluetooth Basic Rate (BR) packets, using a switched beam antenna SBA is described. Paging packets are transmitted and wide antenna beams, quadrants, are selected in turn until the paging response is received. After transmitting the synchronization packet and the temporary connection is established, narrow antenna beams are selected, in sequences and the average signal strength for each beam is recorded, for each sequence. The beam with the highest signal strength is returned as the AOA. Based upon which beam recorded the highest signal strength, the next sequence of antenna beams is selected.
Owner:SR TECH INC

Communication method and device

A communication method and device are applied to a wireless local area network system supporting an IEEE 802.11 ax next generation Wi-Fi protocol, such as 802.11 be, Wi-Fi 7 or EHT, and 802.11 series protocols, such as 802.11 bn or Wi-Fi 8, 802.11 ay, 802.11 aj and the like, of the 802.11 be next generation, and can also be applied to a UWB-based wireless personal local area network system, a sensing system and the like. A first communication device sends a PPDU, and a second communication device receives the PPDU. The PPDU corresponds to at least one target user, the PPDU comprises a data field corresponding to the target user and a parameter NSD corresponding to the target user, and the short is determined by an RU / MRU used for transmitting the data field and an MCS of the data field. The coding and decoding time is effectively shortened, and the coding and decoding efficiency is improved.
Owner:HUAWEI TECH CO LTD

Communication method for UWB and related product

This application discloses a communication method for a UWB and a related product. This application can be applied to a UWB-based wireless personal area network system, a sensing system, a positioning system, a ranging system, or a communication system, and can be further applied to a wireless local area network system that supports 802.11 series protocols such as a next-generation Wi-Fi protocol of IEEE 802.11ax, for example, 802.11be or Wi-Fi 7, and a next-generation protocol of 802.11be, for example, Wi-Fi 8. The method includes: generating a first message including a first bitmap, where an ith bit in the first bitmap corresponds to an ith UWB device, and when the ith bit is set to a specified value, the ith bit indicates a location of parameter configuration information of the ith UWB device in a first DPL; and sending the first message.
Owner:HUAWEI TECH CO LTD

Communication method and related apparatus

A communication method and a related apparatus, which are applied to wireless local area network systems supporting IEEE 802.11ax next-generation Wi-Fi protocols, such as 802.11be, Wi-Fi 7 or EHT, and 802.11 series protocols such as 802.11be next-generation, Wi-Fi 8, UHR and Wi-Fi AI, and can also be applied to ultra-wideband-based wireless personal area network systems and sensing systems. An AP MLD sends at least one first frame on at least one first link, wherein the first frame indicates the effective start time of traffic identifier to link mapping; when the traffic identifier to link mapping indicates that a second link is closed, the time when the AP MLD closes the second link is not earlier than a time point Tb; when the traffic identifier to link mapping indicates that the second link is opened, the time when the AP MLD starts the second link is not later than a time point Ta; and Ta is earlier than Tb. The present application can improve the communication reliability.
Owner:HUAWEI TECH CO LTD

PPDU transmission method and apparatus

This application relates to a physical layer protocol data unit (PPDU) transmission method and an apparatus. The method includes: sending a PPDU with a physical layer header (PHR) field including two parts, one part indicates a data rate of the other part. According to embodiments of this application, demodulation performance of the PHR field can be improved, and transmission duration can be reduced. This application is applied to a ultra-wideband (UWB)-based wireless personal area network (WPAN) system, a sensing system, and the like, including 802.15 series protocols, for example, the 802.15.4a protocol, the 802.15.4z protocol, or the 802.15.4ab protocol. This application is further applied to a wireless local area network system that can support 802.11 series protocols such as a next-generation Wi-Fi protocol of 802.11ax like 802.11be, Wi-Fi 7, or EHT, and a next generation of 802.11be like Wi-Fi 8.
Owner:HUAWEI TECH CO LTD

Communication Method and Apparatus

This application is applied to a UWB-based wireless personal area network system, including 802.15 series protocols, for example, the 802.15.4a protocol, the 802.15.4z protocol, or the 802.15.4ab protocol; a wireless local area network system that can support 802.11 series protocols such as a next-generation Wi-Fi protocol of IEEE 802.11ax, like 802.11be, Wi-Fi 7, or EHT, and a next-generation protocol of 802.11be, like Wi-Fi 8; a sensing system; or the like. Embodiments of this application provide a communication method and an apparatus. According to this application, a transmit end may send a first frame, and then a receive end may determine, based on the first frame, an available narrowband channel that can be used to transmit an NB signal.
Owner:HUAWEI TECH CO LTD