Abstract: Embodiments of this application provide a data transmission method and apparatus. The method includes: receiving data sent by a terminal in an inactive state, where the data includes to-be-sent data sent by the terminal and identification information of the terminal; determining an anchor base station of the terminal based on the identification information; and sending the data to the anchor base station, so that the anchor base station sends the data to a core-network device. The uplink data of the terminal is forwarded to the anchor base station by using a serving base station and through an interaction between the anchor base station and the serving base station that currently provides an air interface resource for the terminal, and is then transmitted to a core network.

Abstract: The present disclosure relates to data transmission methods, network devices, and terminal devices. One example data transmission method includes receiving, by a first network node, a first report from a terminal device, where the first report is used to indicate an uplink data volume of a buffer of the terminal device, and sending, by the first network node, first indication information to a second network node, where the first indication information includes information about the uplink data volume of the buffer of the terminal device, or the first indication information is used to indicate a relationship between the uplink data volume of the buffer of the terminal device and a predefined data volume threshold.

Abstract: A method, a base station, and a system for sending radio resource control (RRC) signaling are provided. The method includes a pico base station and a macro base station participate in configuration and generation of an RRC reconfiguration message; the pico base station establishes only one RRC entity that is used to generate a configuration parameter or an RRC entity; the RRC reconfiguration message cooperatively generated by the pico base station and the macro base station is uniformly sent by the macro base station to a user equipment (UE). According to the application, the UE can support an RRC reconfiguration message sent by the pico base station, only by establishing a signaling radio bearer (SRB) corresponding to the macro base station. Accordingly, design complexity and costs are lowered.

Abstract: A counting method and a communications apparatus are provided. The method includes: determining to retransmit a first protocol layer data packet; and if the retransmission is retransmission for the first time, initializing a retransmission counter associated with the first protocol layer data packet; or if the retransmission is not retransmission for the first time and the first protocol layer data packet is not pending for retransmission, updating the retransmission counter or keeping a value of the retransmission counter unchanged. In this way, RLF can be correctly triggered, to reduce a quantity of times of unnecessary RLF triggering and reduce overheads.

Abstract: A communications method and apparatus. The communications method includes: transmitting a first request to a network device through a first resource, where the first request is used to request beam failure recovery of a first cell or is used to request system information of the first cell, the first resource is a resource of a second cell, and the first cell and the second cell are serving cells of a same terminal; and receiving a first response corresponding to the first request from the network device. Therefore, when a terminal has a plurality of serving cells, the terminal may transmit a request across cells (or across carriers), to improve transmission reliability.

Abstract: Embodiments of this application provide a data processing method, an access device, and a terminal device. The data communication method includes: A first access network device receives a handover request message from a second access network device, where the handover request message is to request a terminal device to hand over from a cell of the second access network device to a cell of the first access network device. The first access network device determines that robust header compression ROHC restriction processing needs to be performed. The data communication method further includes: The first access network device receives at least one packet from the second access network device and performs the ROHC restriction processing on a second packet in the at least one packet. The method can avoid a decompression failure of a terminal.

Abstract: A random access method and apparatus are provided. In this application, a terminal may obtain first-type random access resources and second-type random access resources, where the first-type random access resources are used for first-type random access, and the second-type random access resources are used for second-type random access; the terminal sends a first message to a network device, to initiate the first-type random access; the terminal receives a backoff indicator from the network device, where the backoff indicator is used to indicate a time value, and the time value is used to determine a backoff time range; and when the first-type random access fails, the terminal performs random-access-resource selection in target-type random access resources within backoff duration selected from the backoff time range, where the target-type random access resources include the first-type random access resources or the second-type random access resources.

Abstract: This application provides an uplink transmission method and a communication apparatus. When a terminal device does not obtain a TA value in a two-step random access process, the terminal device can transmit, based on a preset TA value or a maintained TA value, uplink data on an uplink transmission resource assigned in the second step of random access, or perform, based on a preset TA value or a maintained TA value, a feedback for downlink data transmitted on a downlink transmission resource assigned in the second step of random access. In this way, uplink synchronization can be implemented when no TA value is assigned in a random access process.

Abstract: A data transmission, by a terminal device, is described that improves data transmission efficiency while ensuring a transmission latency. The data transmission method includes sending a first transport block to a radio access device for X times by using a shared resource that is configured by the radio access device for at least one terminal, where the terminal is one of the at least one terminal, and X>0. The method further includes determining a dedicated resource allocated by the radio access device to the terminal, and sending the first transport block to the radio access device for Y times by using a target resource. The target resource includes the dedicated resource, and Y?0.

Abstract: A terminal device flexibly configures a time length of a first timer (a downlink hybrid automatic repeat request (HARQ) round trip time timer or an uplink HARQ round trip time timer) based on different application scenarios. A wireless communication method includes: obtaining feature information of a first air interface format and/or feature information of first transmission data; and determining a time length of a first timer based on the feature information of the first air interface format and/or the feature information of the first transmission data, where the first timer is used to indicate that monitoring a physical downlink control channel (PDCCH) is not required within the time length of the first timer.

Abstract: This application provides a random access method and a communications apparatus, so that a terminal device can determine a type of random access to be performed. The method includes: determining at least one random access preamble from at least one 2-step random access preamble, or determining one type of random access preamble from at least one 2-step random access preamble and at least one 4-step random access preamble, and performing random access by using the determined random access preamble.

Abstract: A method for a handover of a mobile station performed by a source base station and a target base station. The target base station receives a handover request message, from the source base station, in which includes QoS information of the mobile device, radio bearer identifier information of the source base station, and a first mapping relationship between a flow and a radio bearer of the source base station, the target base station acknowledges with a handover acknowledgement message. Therefore resource preparation at the target base station during a handover procedure is improved.

Abstract: A communication method is provided. In the method, if a first logical channel of a terminal device does not have an uplink resource for carrying a scheduling request (SR) and the terminal device is in a first SR state, remaining, by the terminal device, in the first SR state and/or a first buffer status report (BSR) state until data of the first logical channel and/or a BSR are/is sent, where the BSR is used to indicate buffer status information of a logical channel group including the first logical channel. When a logical channel of the terminal device does not have an uplink resource for carrying the scheduling request, a problem that the terminal device cannot obtain an uplink transmission resource can be resolved.

Abstract: This application provides a data transmission method. The method includes: A terminal device receives indication information from a network device, where the indication information includes a bit sequence, a value of an ith bit in the bit sequence indicate a usage status of an ith logical channel in M logical channels associated with a radio bearer, and a duplication transmission function is configured for the radio bearer; the terminal device transmits data based on the indication information through at least one logical channel associated with the radio bearer; and because the M logical channels are sorted based on IDs of cell groups associated with the M logical channels and IDs of the M logical channels, the ith bit in the bit sequence included in the indication information indicates the usage status of the ith logical channel in the M logical channels.

Abstract: A network access management method and apparatus for a terminal device. The access network device determines a second access network device based on a current location of a terminal device and network access planning information, where the network access planning information has an identifier of a cell on a movement path of the terminal device, sends a handover request message to the second access network device, the handover request message having a context of the terminal device and the network access planning information, receives handover configuration information used for searching and selecting a cell of the second access network device, and includes an identifier of the cell that belongs to the second access network device and that is in the network access planning information, and sends the handover configuration information to the terminal device.

Abstract: A communication method and apparatus is provided, to properly schedule retransmission of an uplink resource in a scenario in which uplink resources overlap in time domain. The method includes: determining, by a terminal, that a priority of a first uplink resource is higher than a priority of a second uplink resource in the first uplink resource and the second uplink resource that have an overlapping part in time domain; and when determining to send a signal by using the first uplink resource on the overlapping part, indicating, by the terminal to a network device, whether a MAC PDU is formed for the second uplink resource or whether data is stored in a corresponding buffer for the second uplink resource.

Abstract: A method includes: triggering, by a terminal device, a scheduling request (SR); in response to determining that a physical uplink control channel (PUCCH) carrying the SR and a physical uplink shared channel (PUSCH) carrying a first data packet overlap in time domain of a first uplink resource and a processing status of the PUSCH on the first uplink resource is processing completed, sending, based on the processing status of the PUSCH on the first uplink resource, the PUCCH on an overlapping time domain resource. According to the method, when the PUCCH carrying the SR and the PUSCH overlap in time domain of the first uplink resource, the terminal device considers the processing status of the PUSCH on the first uplink resource, and may determine, based on the processing status of the PUSCH on the first uplink resource, to send the PUCCH or the PUSCH on the overlapping time domain resource.

Abstract: A communication method enables a base station to allocate a radio resource to a data packet of a time sensitive networking (TSN) network in a scenario in which the TSN network transmits the data packet through a 5G network. The method includes: obtaining, by an access network device, a first traffic pattern, and allocating a radio resource to a first traffic based on the first traffic pattern. The first traffic pattern includes time information of the first traffic with respect to a first clock. The first clock is a clock used by a first network. The access network device belongs to the first network. The time information includes a time point and/or a period at/in which a data packet of the first traffic arrives at the first network.

Abstract: This application provides a communication method, apparatus, and system. The method includes: determining first information, where the first information includes one or more types of information about an associated beam for a random access success of the terminal device, or, information about an associated uplink carrier for a random access success of the terminal device, and/or includes information about a random access channel RACH resource for a random access failure of the terminal device, and the random access failure of the terminal device includes one or more of a 2-step random access failure, a 4-step random access failure, a dedicated RACH resource random access failure, or a common RACH resource random access failure; and sending the first information.

Abstract: Embodiments of this application provide a communication method and a communications apparatus. The communication method includes: when a radio bearer RB needs to be established between a network device and a terminal device, the network device includes a first node and a second node, and functional entities corresponding to the RB include one PDCP entity and more than two RLC entities corresponding to the PDCP entity. The method includes: determining, by the first node, configuration information, where the configuration information is used to instruct the second node to establish N tunnels, the tunnel is used to transmit PDCP data or RLC data between the first node and the second node, and N is an integer greater than or equal to 2; and transmitting, by the first node, the configuration information to the second node.