Abstract: Embodiments of the present invention provide a cell selection and reselection method and apparatus, so as to resolve a problem existing in the prior art that repeated reception of data by using an existing cell selection and reselection method causes a waste of resources and an increase in power consumption. The cell selection method includes: measuring signal quality of a cell, and acquiring a coverage class offset value that is preconfigured by a network side for the cell; and selecting a target cell according to the signal quality of the cell and the acquired coverage class offset value of the cell.

Abstract: Embodiments of this application provide a method for transmitting positioning assistance data and a device. The method includes: receiving, by a network device, at least one positioning assistance data message sent by a positioning server, where the at least one positioning assistance data message is used to carry positioning assistance data; and broadcasting, by the network device, a system message to a terminal device, where the system message is used by the terminal device to obtain the positioning assistance data. According to the embodiments of this application, the network device broadcasts the system message to broadcast the positioning assistance data. In this way, a problem of low efficiency of transmitting existing centralized positioning assistance data can be resolved, and a problem in the prior art that a positioning server needs to perform signaling communication with each terminal device in a unicast transmission scenario can be avoided, thereby reducing signaling overheads.

Abstract: A base station encodes antenna configuration information of a neighboring cell of a first cell, and sends encoded information relating to the antenna configuration information of the neighboring cell to a user equipment (UE). The UE is capable of communicating with the base station in the first cell. The UE receives the encoded information; decodes the antenna configuration information of the neighboring cell from the encoded information; and performs determination of predetermined time-frequency resource according to the antenna configuration information of the neighboring cell. The predetermined time-frequency resource is used by a base station of the neighboring cell for transmitting pilot measurement information.

Abstract: Embodiments of this application provide a random access method. The method includes: determining, by a terminal device, a second access carrier based on a pre-obtained access carrier information list and information about a first access carrier that is indicated by a base station and that can be used for access, where the access carrier information list includes information about all carriers that support random access; and then performing, by the terminal device, random access on the second access carrier. This reduces a probability of a collision between the terminal device and the another terminal device, and avoids interference on use of the another terminal device.

Abstract: Disclosed are systems and methods that include embodiments to determine a system frame number (SFN) of a radio frame using a first identifier related to the UE, a discontinuous reception (DRX) period length of the UE, and a parameter indicating a quantity of paging occasions within the DRX period length. A second identifier can be sent in a downlink control channel within a radio sub-frame of the radio frame, and a paging message is associated with the second identifier. This systems and methods may also include embodiments to determine a position of the radio sub-frame within the radio frame associated with the SFN with reference to a quantity of radio sub-frames suitable for the paging in the radio frame, the identifier related to the UE, and a parameter derived from the DRX period length of the UE.

Abstract: This application provides a data transmission link establishment apparatus. The apparatus includes: a selection unit, configured to select a target node; a determining unit, configured to determine a backhaul node that needs to establish a data transmission link with the target node selected by the selection unit; a setting unit, configured to set protocol stack roles, in the data transmission link, of the target node and the backhaul node that is determined by the determining unit; and a configuration unit, configured to perform configuration on the target node and the backhaul node according to the protocol stack roles that are set by the setting unit, to establish the data transmission link between the target node and the backhaul node.

Abstract: The present disclosure discloses a link re-establishment method, an apparatus, and a system. The method includes: obtaining, by user equipment UE, a MAC of the UE based on a NAS integrity key and a first MAC generation parameter, where the first MAC generation parameter includes an identifier of the UE; sending, by the UE, a re-establishment request message to a target RAN, where the re-establishment request message includes the MAC and the first MAC generation parameter; and receiving, by the UE, a re-establishment response message of the target RAN. The UE triggers, by sending the re-establishment request message, a CP functional entity to perform authentication on the UE. This resolves a prior-art problem that an excessively long time is consumed to re-establish a connection to a target RAN by using an RAU procedure, increases a speed of re-establishing a connection between UE and a network, and improves user experience.

Abstract: The present disclosure relates to information transmission methods. One example method includes obtaining, by a positioning center, coverage indication information, where the coverage indication information is used to indicate a coverage enhancement level of user equipment UE, indicate that UE is at a first coverage enhancement level, or to indicate that UE requests to reduce a quantity of to-be-measured cells, and sending, by the positioning center, positioning measurement configuration information to the UE, where the positioning measurement configuration information is determined by the positioning center based on the coverage indication information, and the positioning measurement configuration information is used to perform positioning measurement configuration on the UE.

Abstract: Embodiments of this application provide a method for transmitting positioning assistance data and a device. The method includes: receiving, by a network device, at least one positioning assistance data message sent by a positioning server, where the at least one positioning assistance data message is used to carry positioning assistance data; and broadcasting, by the network device, a system message to a terminal device, where the system message is used by the terminal device to obtain the positioning assistance data. According to the embodiments of this application, the network device broadcasts the system message to broadcast the positioning assistance data. In this way, a problem of low efficiency of transmitting existing centralized positioning assistance data can be resolved, and a problem in the prior art that a positioning server needs to perform signaling communication with each terminal device in a unicast transmission scenario can be avoided, thereby reducing signaling overheads.

Abstract: A multicast service transmission method and a device, the method comprising determining, by a core network device, a coverage requirement of a to-be-transmitted multicast service, transmitting, by the core network device, the coverage requirement to an access network device, where the coverage requirement is used to determine a transmission parameter used to transmit the multicast service to a terminal device, receiving, by the access network device, the coverage requirement, determining, by the access network device according to the coverage requirement, the transmission parameter, and transmitting, by the access network device, the multicast service to the terminal device according to the transmission parameter.

Abstract: Embodiments of the present application provide a communication method. The method is applied to a random access process and includes: receiving indication information sent by a network device, where the indication information includes at least one piece of the following information: access probability information of each of a plurality of carriers, access control information of at least one of the plurality of carriers, overload indication information of at least one of the plurality of carriers, power boost information of at least one of the plurality of carriers, and access indication information of one of the plurality of carriers; and determining, based on the indication information, one carrier from the plurality of carriers as a target carrier to perform random access.

Abstract: Embodiments of the present invention disclose a paging method, a core network device, a base station, and user equipment. The method includes: determining, by the core network device, reference frame information when the core network device determines that a synchronization occasion arrives, where the reference frame information includes a radio frame number; and sending, by the core network device, the reference frame information to a base station in a paging area, so that the base station synchronizes a radio frame in the base station according to the reference frame information. The embodiments of the present invention can reduce problems that UE cannot listen for a paging message.

Abstract: Embodiments of this application provide a data processing method and a related device, to effectively ensure that a terminal in the Narrowband Internet of Things can completely receive, after accessing a target base station, downlink data that is not completely received before handover or reselection, in other words, to effectively ensure that the downlink data of the terminal is not lost, thereby ensuring mobility of the terminal in connected mode. Technical solutions provided in the embodiments of this application are as follows: A core network device obtains a first indication message, where the first indication message is used to indicate that a terminal completes a cell change or a cell reselection. The core network device sends downlink data to a target base station, where the target base station is a base station to which the terminal is connected after completing the cell change or the cell reselection.

Abstract: Embodiments of this application provide a cell obtaining method and a terminal to reduce power consumption of the terminal. Technical solutions provided in the embodiments of this application are as follows: When a terminal is connected to a current source serving cell, the terminal obtains a first quality parameter of the current source serving cell; if the first quality parameter is less than a first preset threshold, the terminal determines a measurement cell set; the terminal measures each measurement cell in the measurement cell set to obtain each corresponding second quality parameter; and the terminal determines a target serving cell based on the second quality parameter.

Abstract: Embodiments can provide a transmission method and a wireless communications device. For achieving such, a multicast coverage level of a multicast service can be determined by a group communication application server. The multicast coverage level may be a coverage level used when a network device corresponding to the cell transmits the service in multicast mode. A multicast transmission indicator can be sent, by the group communication application server, to a network device of the multicast service through a BM-SC, an MME, and an MCE. The multicast coverage level indication information may correspond to the multicast coverage level.

Abstract: Embodiments of the present invention provide a radio access control method. The method includes that a terminal device receives access control information sent by an access network device, wherein the access control information indicates a barred service type and a barred data transmission attribute to the terminal device; and the terminal device determines whether to send a radio resource control (RRC) connection request to the access network device based on the barred service type and the barred data transmission attribute; wherein the data transmission attribute comprises a transmission scheme type, the transmission scheme type is used to indicate a transmission scheme used by the terminal device for transmitting service data used by the terminal device. Thereby improving network resource utilization.

Abstract: Embodiments of this application disclose a resource scheduling method, an access network device, and user equipment, to reduce a quantity of times of applying for an uplink resource by using a random access process, reduce additional signaling overheads brought to the user equipment, and reduce power consumption of the user equipment. The method part in the embodiments of this application includes: determining, by an access network device, a target time interval in which user equipment monitors a downlink control channel; and sending, by the access network device, uplink resource scheduling information to the user equipment by using the downlink control channel in the target time interval.

Abstract: The present disclosure provides a method and an apparatus for determining a transmission solution. The method includes: obtaining, by a base station, a transmission solution switching instruction of UE, where the transmission solution switching instruction of the UE is used to instruct to switch a transmission solution of the UE from user plane transmission to control plane transmission or from control plane transmission to user plane transmission, and configuring, by the base station, a switched-to transmission solution with the UE based on the transmission solution switching instruction. The base station obtains the transmission solution switching instruction by using statuses of the UE or a core network device, and configures the switched-to transmission solution with the UE, so that switching of the transmission solution of the UE is implemented, without a need of performing re-attach to the core network device and tracking area update by the UE.

Abstract: The method includes: A terminal device sends an access request to a cell to which the terminal device belongs, monitors a downlink control channel, and receives an access response message based on scheduling information on the downlink control channel, further, if the access response message carries a backoff access identifier, the terminal device determines the backoff parameter corresponding to the backoff access identifier in the access response message based on a correspondence that is pre-stored and that is between the backoff access identifier and a backoff parameter, the terminal device determines backoff duration based on the backoff parameter and an access resource interval period corresponding to the terminal device; and sends an access request to the cell after the backoff duration.

Abstract: A machine type communication (MTC) scheduling method, a base station, and a user equipment (UE). An embodiment of a method in the embodiments of the present disclosure includes sending, by a base station, first downlink control information (DCI) to the UE in an air-interface idle mode in a cell, where the first DCI includes a first resource indicator corresponding to a first identifier of target UE, and the first identifier identifies, during resource scheduling, the target UE in the air-interface idle mode that is scheduled by the base station, and sending, by the base station, a first data packet to the target UE according to the first resource indicator.