Abstract: A communication method and apparatus are provided, so that an access network device can configure an initial hyper frame number (HFN) and a reference sequence number (SN) for a terminal device in time when no data packet is received from a core network device. The method includes: A first core network device obtains an initial multicast/broadcast service (MBS) quality of service flow identifier (QFI) SN corresponding to a first MBS session, and sends the initial MBS QFI SN in a first procedure. The first procedure is a procedure before a the 1st data packet of the first MBS session is sent to an access network device. After receiving the initial MBS QFI SN in the first procedure, the access network device may determine an initial HFN and a reference SN based on the initial MBS QFI SN, and send the initial HFN and the reference SN to a terminal device.

Abstract: A communication method and apparatus are provided, relate to the field of communication technologies, and are used to alleviate a problem of how to set a PDCP window variable when a terminal device performs packet data convergence protocol PDCP entity suspending or PDCP entity re-establishment. The method may include: The terminal device receives, from a network device, first information indicating packet data convergence protocol PDCP suspending, and sets, to an initial value, a PDCP window variable associated with a radio bearer RB other than a first RB. The first RB may include a multicast and broadcast service radio bearer MRB.

Abstract: The disclosure provides communication methods and apparatuses. One example method includes that at least one data packet of a first service is received, where the at least one data packet includes a first data packet, and the first data packet is located at a first location in the at least one data packet. Then, the at least one data packet and first indication information are sent to a first network device, where the first indication information indicates the first location.

Abstract: Embodiments of this application provide example communication methods and apparatuses. One example method includes receiving, by a terminal device, N pieces of first information in N separate transmissions, where N is an integer greater than 1. The terminal device can then determine second information or transmission information of the second information based on at least a part of the N pieces of first information, where each of the N pieces of first information includes M bits, and M is an integer greater than or equal to 1.

Abstract: Methods and apparatuses for sending a multicast control channel are provided. One example method includes a terminal device receiving first configuration information, where the first configuration information indicates N modification periods, and N is an integer greater than 1. The terminal device determines, based on the first configuration information, a modification period corresponding to a first service, and monitors a modification notification of an MCCH based on the modification period corresponding to the first service. Therefore, in some instances, services with different latency sensitivities can correspond to different modification periods to meet latency requirements of different services and ensure an electricity saving effect of the terminal device.

Abstract: A radio resource control (RRC) connection resume method includes receiving, by a first network device, an RRC connection resume request message from a terminal device. The RRC connection resume request message is used to request to resume an RRC connection of the terminal device. The method also includes sending a first message to a second network device. The first message includes auxiliary information. The auxiliary information includes at least one of information used by the terminal device to perform redirection or information used by the terminal device to perform cell reselection, or the auxiliary information indicates that the first network device cannot respond to the RRC connection resume request message of the terminal device. The method further includes receiving an RRC release message from the second network device. The method additionally includes sending the RRC release message to 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: Embodiments of the present invention provide a group communication method and an apparatus. A base station is provided, including: a processor, configured to determine to start scheduling PTM transmission in a first cell, where the scheduling PTM transmission is used to enable UE in the first cell to receive data on a scheduling PTM transmission resource; and a transmitter, configured to: send configuration information of the scheduling PTM transmission to the UE in the first cell, where the configuration information is used to enable the UE in the first cell to receive data according to an indication of the configuration information; and send, on the scheduling PTM transmission resource, data according to the indication of the configuration information.

Abstract: A communication method, apparatus, and system are provided. The method may include: A terminal apparatus determines first indication information, where the first indication information indicates a status of a multicast/broadcast service, and the status of the multicast/broadcast service includes an inactive state; and the terminal apparatus stops, based on the first indication information, using a first radio network temporary identifier to monitor a physical downlink control channel corresponding to a multicast broadcast traffic channel. In the method, a network apparatus indicates the status of the multicast/broadcast service to the terminal apparatus. When determining that the status of the multicast/broadcast service is inactive, the terminal apparatus may not monitor the physical downlink control channel corresponding to the multicast broadcast traffic channel. This reduces power consumption of the terminal apparatus.

Abstract: A communication method and a communication apparatus are disclosed. The method includes: For a terminal device that enters a non-connected mode, when a network device pages the terminal device to receive a first multicast service, the network device may further indicate whether to provide the first multicast service for the terminal device in an RRC non-connected mode. The terminal device may perform at least one of the following based on the paging and indication of the network device: receiving the first multicast service in the RRC non-connected mode; or performing an RRC connection control procedure. According to the method, network congestion caused by simultaneous access of a large quantity of terminal devices can be avoided, and access of the terminal devices can be effectively managed.

Abstract: A mobility management method and an apparatus can improve continuity of a multicast service of a terminal device. The method includes: A source access network device sends, to a target access network device, a first message for requesting to hand over a first multicast service of a first terminal device to a first target cell, and the target access network device sends a second message to the source access network device as a response to the first message, where the second message includes first information indicating a first candidate cell, and the first candidate cell is a cell that provides a multicast service for a terminal device in an RRC non-connected mode. After receiving the second message, the source access network device sends, to the first terminal device, third information indicating a second candidate cell.

Abstract: A random access method and apparatus are provided. The method includes: a terminal device obtains a position of the terminal device and a position of a network device, the terminal device determines a time adjustment value based on the position of the terminal device and the position of the network device, and the terminal device sends a random access preamble based on the time adjustment value and a random access channel (RACH) resource configured by the network device. Based on this solution, the terminal device may determine the time adjustment value based on the position of the terminal device and the position of the network device, and adjust a time for sending the random access preamble on the RACH resource. This helps avoid a problem that random access preamble receiving time windows overlap, thereby increasing a success rate of accessing the network device by the terminal device.

Abstract: Embodiments of this application provide an information processing method, a communications device, a system, and a storage medium. The method includes: generating, by a network device, first configuration information of an uplink reference signal, where the first configuration information includes a first mapping relationship between an uplink reference signal resource and first information, the first information is information about a downlink reference signal of a location measurement unit LMU, and the LMU is an LMU other than a serving base station; and sending, by the network device, the first configuration information to a terminal. The terminal can send a positioning signal on a configured uplink reference signal resource as indicated by the first configuration information, so that the LMU corresponding to the first information corresponding to the uplink reference signal resource can receive the positioning signal, thereby implementing UTDOA positioning in an NR system.

Abstract: For data transmission when a communication manner between the network device and a plurality of terminal devices is switched from a unicast manner to a multicast manner, a data transmission method includes: A network device sends first indication information to a first terminal device, where the first indication information includes a first sequence number (SN), and the first indication information is used to indicate the first terminal device to receive a data packet in a multicast manner. The network device sends the data packet to the first terminal device and a second terminal device in the multicast manner based on the first SN.

Abstract: A first network device determines a first cell. The first network device sends a first message, where the first message includes an identifier of the first cell, and the identifier of the first cell is used to indicate a terminal device to perform cell reestablishment.

Abstract: A communication method and apparatus. A terminal device determines, based on first information received from a first network device, that a second network device has first time information, where the first time information is time information having precision that is higher than precision of second time information of the first network device. The terminal device obtains the first time information of the second network device based on the first information. The terminal device obtains high-precision time information to improve communication reliability.

Abstract: A terminal device receives a SIB of a SCell, where the SIB includes information used for obtaining an MCCH configuration of an MBS; and sends an MII message, where the MII message carries an identifier of an MBS service of interest to the terminal device. In this way, in some embodiments, for example, in a scenario in which the secondary cell can provide a broadcast service, the terminal device may report, based on the received SIB of the SCell, the identifier of the MBS service of interest to the terminal device.

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: Systems, modules, methods, and machine-readable storage media for Frequency Angular Resolving (FAR) are described. In an embodiment, the system comprises a transmitter and a receiver. In an embodiment, the transmitter comprises a source of electromagnetic radiation; a driver circuit configured to generate a drive signal at an oscillation frequency; an acousto-optical beam steering device optically coupled with the source of electromagnetic radiation and the driver circuit and configured to emit electromagnetic radiation at an emission angle as a function of the oscillation frequency. In an embodiment, the receiver comprises a radiation sensor optically coupled with the source of electromagnetic radiation. In an embodiment, the system comprises an electro-optic modulator optically coupled to the source of electromagnetic radiation, the electro-optic modulator configured to modulate a frequency of light emitted to the acousto-optical beam steering device.

Abstract: A first apparatus establishes a first radio link control RLC entity and a second RLC entity, where the first RLC entity and the second RLC entity are associated with a first packet data convergence protocol PDCP entity. The first apparatus sends first data through the first RLC entity and/or the second RLC entity. The first RLC entity corresponds to a unicast transmission mode, and the second RLC entity corresponds to a multicast transmission mode.