Abstract:
A data transmission method, a base station, and a user equipment. The data transmission method includes determining, by a base station, a modulation and coding scheme level and the number of physical resource block pairs, selecting one transport block size (TBS) table from a first TBS table and a second TBS table, and determining a corresponding TBS, so that a coding rate can be increased when the base station transmits service data to the UE according to a TBS in the selected second TBS table.
Abstract:
Embodiments provide a control channel transmission method and apparatus. A control channel is mapped to an eREG. That corresponds to determined eREG information, among a designated number of eREGs in each unit physical resource block. Each eREG among the designated number of the eREGs is formed by a designated number of resource elements. The designated number of the resource elements are selected from corresponding resource elements at an Sth position in each group. S is a positive integer smaller than or equal to N. The control channel can be transmitted on the mapped eREG.
Abstract:
Embodiments of the present invention provide a reference signal transmission method and user equipment. The method includes: determining, by a first user equipment, a first identifier related to the first user equipment; determining, by the first user equipment, a first cyclic shift indication from to-be-selected cyclic shift indications according to the first identifier; determining, by the first user equipment, first reference signal according to the first cyclic shift indication and a preset base sequence; and sending, by the first user equipment, the first reference signal to second user equipment, thereby implementing reference signal transmission in D2D communication.
Abstract:
Embodiments of the present invention provide a method for detecting a device-to-device signal, a user equipment, and a base station. The method includes: receiving a first message; determining, according to the first message, a first timing advance for a first user equipment to detect a D2D signal sent by a second user equipment; determining a reference time according to a received reference signal; determining, according to the first timing advance and the reference time, a first time for detecting the D2D signal; and detecting the D2D signal at the first time. So that when the user equipment detects the D2D signal at the determined time for detecting a D2D signal, a D2D signal detection success rate can be improved.
Abstract:
A method includes: receiving, by a UE, a power control parameter set sent by a base station, where the power control parameter set includes at least one power control parameter group, where the power control parameter group includes at least one power control parameter; determining, by the UE, a first power control parameter group according to the power control parameter set; and determining, by the UE, a transmit power of the UE according to a power control parameter in the first power control parameter group. so that the UE obtains through calculation, according to the power control parameter in the first power control parameter group, the transmit power that satisfies a service currently initiated by the UE, and a communication range of the UE is ensured.
Abstract:
A communication control method, including receiving, by a first user equipment, a first message sent by a second user equipment; acquiring receive power of the first message; acquiring power parameter information of the second user equipment; obtaining a path loss value according to the power parameter information of the second user equipment and the receive power of the first message; and determining, according to the path loss value, whether direct communication is allowed between the first user equipment and the second user equipment. The embodiments of the present invention further provide a corresponding user equipment and system. According to the method, user equipment, and system in the embodiments of the present invention, control on direct communication between user equipment can be implemented.
Abstract:
Embodiments of the present invention provide a reference signal transmission method and user equipment. The method includes: determining, by a first user equipment, a first identifier related to the first user equipment; determining, by the first user equipment, a first cyclic shift indication from to-be-selected cyclic shift indications according to the first identifier; determining, by the first user equipment, first reference signal according to the first cyclic shift indication and a preset base sequence; and sending, by the first user equipment, the first reference signal to second user equipment, thereby implementing reference signal transmission in D2D communication.
Abstract:
Embodiments of the present disclosure relate to a communication access method and user equipment, where the method includes sending, by a first user equipment, a first channel access request message before determining to send first information, detecting, by the first user equipment in a reserved resource, a second channel access request message sent by another user equipment, and then, sending, by the first user equipment, the first information when it is determined that the second channel access request message sent by the other user equipment is not detected in the reserved resource or a second scheduling priority carried in the second channel access request message detected in the reserved resource is lower than the first scheduling priority. Therefore, competition with another user equipment for a channel resource is avoided, and a probability of a collision occurring when information is sent on a channel is reduced.
Abstract:
A device-to-device (D2D) communication method and an apparatus where the method includes acquiring, by a first device, a communication signal resource and timing information of the communication signal resource, where the communication signal resource is used for D2D communication, and receiving, by the first device, on the communication signal resource according to the timing information of the communication signal resource, a communication signal sent by a second device, and using the D2D communication method and the apparatus provided in the present disclosure, synchronization between user devices for D2D communication can be implemented such that users located in different cells can use a D2D proximity service.
Abstract:
A communication method includes: determining a correspondence between Y uplink subframes and X downlink subframes, where the Y uplink subframes are used to respectively transmit HARQ information that is corresponding to the X downlink subframes, at least one uplink subframe of the Y uplink subframes is an uplink subframe on an FDD carrier, and the X downlink subframes are downlink subframes in one radio frame on a TDD carrier; and communicating with UE according to the correspondence.