Abstract: This application provides a cell selection method and a terminal device, and relates to the communication field. In a cell selection process, a requirement on a capability of the terminal device is lowered. The method includes: The terminal device obtains a target signal of a target cell; and when the terminal device continuously successfully obtains a target signals, the terminal device determines the target cell as a cell on which camping is allowed, where a is a positive integer greater than a threshold b, and the cell on which camping is allowed is a cell that meets a cell selection criterion requirement of the terminal device; or when a quantity of target signals continuously successfully obtained by the terminal device is less than or equal to a threshold b, the terminal device determines the target cell as a cell on which camping is not allowed.

Abstract: A communication method and apparatus trigger a terminal device with a low complexity capability to activate a power saving mode and reduce signaling overheads in a power saving configuration process. The method may include the terminal device receiving first information from a network device and activates a power saving mode. The first information is received either as broadcast signal, a multicast signal, or a paging message. The first information includes power saving duration information indicating power saving duration, and duration for which the terminal device is in the power saving mode is less than or equal to the power saving duration.

Abstract: This application discloses a random access method and an apparatus. The method includes: A first device sends first information to a terminal device within coverage. When a first service or first signaling initiated by the terminal exists in the terminal device, a first access resource may be selected from an access resource in the first information, and then an access request message is sent to the first device on the first access resource. It may be determined, based on response information of the first device, that the first service or the first signaling can be transmitted to the first device. The terminal device determines a time at which the terminal device needs to perform access, reducing an uplink service processing delay.

Abstract: A communication method and apparatus are provided, and relate to the field of communication technologies, to prevent terminal devices from being repeatedly read while performing inventory on the terminal devices at a plurality of coverage levels. This reduces power consumption of the terminal devices, and improves an inventory rate. The method may include: When indicating a terminal device to perform access, a network device may also indicate an identifier of an event or a session that triggers access; the terminal device initiates access; and when receiving a second access indication triggered by a same event or session, the terminal device may determine not to make a response. In this way, the terminal device is not repeatedly read based on a same event/session/coverage level.

Abstract: Embodiments of this application provide a communication method, apparatus, and system, and provide an access procedure in which a device actively initiates access. The communication method includes: A first device sends configuration information to a second device, where the configuration information is used by the second device to determine a first time domain resource and/or a first frequency domain resource for sending a first message when the second device actively initiates access, and the first message is used by the second device to request to access the first device. When failing to receive the first message from the second device on the first time domain resource and/or the first frequency domain resource, the first device sends a second message to the second device, where the second message indicates the second device to access the first device again.

Abstract: A communication method and apparatus are provided, and relate to the field of communication technologies, to support a radio frequency identification RFID system in segmenting data based on a segmentation mechanism, simplify the segmentation mechanism, and reduce segmentation overheads. The method may be applied to the RFID system. A first protocol layer of a terminal device obtains first information that indicates a transport block size. If a size of a first data packet is greater than the transport block size, the first protocol layer segments the first data packet based on the transport block size, to obtain a plurality of first segmented data packets, and sends the plurality of first segmented data packets. The first data packet is a data packet received by the first protocol layer from a previous protocol layer. A size of the first segmented data packet is less than or equal to the transport block size.

Abstract: This application provides a paging method and an apparatus. In the paging method, a first core network device sends first signaling to a first device, indicating to the first device to page a terminal device. The first device may send second signaling, where the second signaling may indicate information about a first flag. The information about the first flag indicates that a type of a flag of a to-be-paged terminal device is a first type and/or a state of the flag is a first state, to determine the to-be-paged terminal device. In this way, a mechanism for paging the terminal device is provided, and there is no need to determine which terminal device is to be paged. This helps simplify the process of paging the terminal device.

Abstract: A communication method and apparatus are provided. The method includes: A network device sends first signaling, indicating a terminal device to initiate random access on a first random access occasion; after receiving the first signaling, if the terminal device cannot complete the random access or data transmission after the random access, for example, stored energy of the terminal device is insufficient, the terminal device may send first indication information to the network device, indicating that a first terminal device cannot complete the random access or data transmission after the random access; and after receiving the first indication information, the network device may send second signaling, indicating the terminal device to initiate random access on a next random access occasion (namely, a second random access occasion) after the first random access occasion.

Abstract: The technology of this application relates to a paging method and an apparatus. A first device sends first signaling used to page a terminal device. The first signaling includes memory information or an identifier of the terminal device, to indicate the to-be-paged terminal device. In addition, the terminal device may further determine a first resource based on the first signaling, to send uplink data by using the first resource. The first device may also receive, on the first resource, the uplink data from the terminal device. The terminal device may determine the first resource based on the first signaling is equivalent to the first device allocating a resource to the terminal device. In this way, steps needing to be performed for data transmission between the terminal device and the first device are reduced.

Abstract: A network device sends first indication information to a first terminal; and the first terminal sends a system information request based on the first indication information, where the first indication information indicates to send the system information request based on first resource configuration information by using a Msg 1; or the first indication information indicates to send the system information request by using a Msg 3.

Abstract: A communication method and a communication apparatus. The method includes: sending first indication information to a terminal device, where the first indication information indicates one or more wake-up resources; receiving second indication information from a core network device, where the second indication information indicates to wake up the terminal device; determining a first wake-up resource based on the one or more wake-up resources; and sending wake-up information to the terminal device on the first wake-up resource, where the wake-up information is used to wake up the terminal device to receive a paging message or is used to wake up the terminal device to initiate random access. This can ensure that the terminal device can always monitor the wake-up information when there is wake-up signal coverage, and a problem of high-power consumption of the terminal device in a paging process is further resolved.

Abstract: This disclosure provides a communication method and a communication apparatus. In some aspects, a network device receives first indication information from a core network device, where the first indication information indicates the network device to trigger, after receiving uplink data from a first terminal device, a second terminal device to access the network device. After the network device receives first uplink data from the first terminal device, the network device triggers the second terminal device to access the network device. According to the method, complexity of data transmission and processing procedures of an inventory taking procedure transplanted to a cellular network can be reduced, so that an inventory taking rate of terminal devices and a communication capacity of a system are effectively improved.

Abstract: A terminal device camps on a first cell in an idle state or an inactive state. The terminal device measures the first cell based on a first non-cell defining synchronization signal/physical broadcast channel block (NCD-SSB) frequency, and measures a second cell based on the first NCD-SSB frequency and/or a cell defining synchronization signal/physical broadcast channel block (CD-SSB) frequency. The terminal device performs cell reselection based on a measurement result of the first cell and a measurement result of the second cell.

Abstract: The present disclosure discloses example communications methods and apparatuses. One example method includes obtaining effective carrier indication information from a network device. An effective carrier frequency is obtained based on the effective carrier indication information, where the effective carrier indication information includes first information, second information, and third information. The first information includes first indication information, second indication information, or third indication information. The first indication information is used to indicate that carriers are not paired, the second indication information is used to indicate that carriers are paired, the third indication information is used to indicate a paired carrier frequency spacing, the second information is used to indicate a start carrier frequency, and the third information is used to indicate a frequency domain location of an effective carrier relative to a start carrier.

Abstract: Embodiments of this disclosure provide a paging method and an associated communication apparatus, medium, and chip. According to embodiments of this disclosure, an access network device sends information including an address of the access network device and an identifier of a terminal device to a core network device. The core network device determines an area for paging based on the address of the access network device, and sends a paging message including the identifier of the terminal device to the access network device. The access network device sends a radio access network paging message to the terminal device. In this manner, the area in which paging needs to be performed by the core network device can be reduced, thereby avoiding a waste of unnecessary paging resources.

Abstract: Embodiments of this application provide an identification method and apparatus. The method includes: A first device sends a first command to at least one device, where the at least one device includes a second device, the first command is used to obtain first prefix information, the first prefix information includes k bits, and k is an integer greater than or equal to 1. The first device receives a first random number from the second device, where the first random number corresponds to the first prefix information. The first device determines, based on the first random number, that the second device accesses the first device. This application provides the method for identifying the second device by the first device. This can identify the second device, and implement inventory and random access of the second device.

Abstract: A communication method includes determining, by an access network device, that first information from a terminal device is not received in a first bandwidth part (BWP). The first BWP is an active BWP for the terminal device. The first BWP does not include common search space (CSS) used to transmit a system information block (SIB). The first information is associated with a system information update. The communication method also includes sending, by the access network device, updated system information to the terminal device in the first BWP in response to determining that the first information is not received.

Abstract: Embodiments of this application disclose a method for waking up a terminal device in a communication network, an apparatus, and a readable storage medium. The method includes: after a terminal device enters an idle state or an inactive state, when the terminal device detects that a doze condition is met, the terminal device enters a doze state from the idle state or the inactive state. During a first time period after the terminal device enters the doze state, if the terminal device does not receive wake-up information or detects that signal quality of the wake-up information is less than or equal to a first threshold, the terminal device enters a wake-up state from the doze state.

Abstract: A communication method and device. The method includes: inventory indication information sent by a network device to a terminal device includes information for determining a target terminal device. The inventory indication information indicates that the network device selects the target terminal device to initiate a random access request, or the inventory indication information indicates that the network device supports the target terminal device in initiating a random access request. In this way, the network device may select, based on target terminal devices of different types, or target terminal devices having different capabilities, a target device to perform random access, thereby improving random access efficiency of a second device and performance of subsequent data transmission of the target terminal device.

Abstract: This application discloses a communication method and a communication apparatus. The method includes: A first access network device receives paging capability information from a core network device or a second access network device, determines a paging area based on the paging capability information, and sends a paging message to a terminal device in the determined paging area. The paging capability information indicates one or more of the following capabilities: a maximum transmit power supported by the terminal device on a first frequency band; a bandwidth configuration supported by the terminal device; whether the terminal device supports a frequency offset of 7.5 kHz; a type of the terminal device; or a number of Rx chains supported by the terminal device. In other words, the paging capability information indicates a plurality of paging capabilities of the terminal device.