Abstract:
A transmission method and a communications device, and the method includes sending a first data frame to a second communications device using an unlicensed carrier, and sending M second data frames to the second communications device using a licensed carrier, where at least one data frame in the M second data frames carries first information, the first information includes information required for detecting the first data frame by the second communications device, and M is an integer not less than 1. According to the transmission method and the communications device, the energy consumption of the communications device can be reduced.
Abstract:
Embodiments of the present invention disclose a data transmission method, including: obtaining, by a first device, N orthogonal frequency division multiplexing OFDM symbols, where the N OFDM symbols are used to carry control information and data; and sending, by the first device, a first subframe and a second subframe to a second device, where the first subframe or the second subframe carries the control information, the first subframe includes M OFDM symbols of the N OFDM symbols, the second subframe includes K OFDM symbols of the N OFDM symbols, N is a positive integer, M or K is zero or a positive integer, M is not greater than N, and K is not greater than N. The embodiments of the present invention further provide a first data transmission device.
Abstract:
A data transmission method, a device, and a system for data transmission includes a first device that determines a hybrid automatic repeat request (HARQ) process number of a first subframe according to an HARQ process number of a second subframe, the first device sends the first subframe and the second subframe to a second device, and the second subframe includes the HARQ process number of the second subframe.
Abstract:
The present disclosure provides an information transmission method, a device, and a system, and relates to the communications field, so as to resolve a prior-art problem that when an unlicensed spectrum is preempted to send data, a receive end cannot obtain a correct time resource sequence number, and cannot descramble information. A first device scrambles, according to a first scrambling code sequence, first data carried on a first time resource on an unlicensed carrier, where the first data is data that is sent by the first device to a second device, and the first scrambling code sequence is generated according to a sequence number of a second time resource on a licensed carrier or a first value; and the first device sends scrambled first data to the second device.
Abstract:
A synchronization method, an apparatus, and a system, which relate to the communications field and applied to synchronization signal transmission to implement synchronization of data frame transmission between devices on an unlicensed carrier are provided. The synchronization method is applied to synchronization on an unlicensed carrier. A network device sets a synchronization signal in a first subframe, and the network device sends the first subframe or the first subframe and a second subframe to user equipment, where the first subframe includes M orthogonal frequency division multiplexing (OFDM) symbols, the second subframe includes N OFDM symbols, M and N are positive integers, M>N, and the first subframe and the second subframe are subframes of an unlicensed carrier.
Abstract:
The present invention discloses an information transmission method, a device, and a system, which relates to the communications field, so as to resolve a prior-art problem that a receive end cannot determine a quantity of OFDMs included in an incomplete subframe, and cannot correctly receive the incomplete subframe. A specific solution is as follows: A network device determines one or more PHICH resources of a first subframe, where the one or more physical hybrid automatic repeat request indicator channel PHICH resources indicate a quantity of orthogonal frequency division multiplexing OFDM symbols included in a second subframe on an unlicensed carrier; and the network device sends the first subframe and the second subframe to user equipment. The present invention is used for information transmission.
Abstract:
Embodiments relate to the field of communications technologies, and in particular, to a device to device (D2D) signal frequency hopping method and a base station. The method includes: obtaining, by the base station, a first frequency hopping parameter, where the first frequency hopping parameter is a frequency hopping parameter of a physical uplink shared channel (PUSCH). The method also includes sending, by the base station, the first frequency hopping parameter to D2D user equipment, and instructing, by the base station, the D2D user equipment to use the first frequency hopping parameter to perform frequency hopping on a D2D signal.
Abstract:
Embodiments of the present invention provide a method for transmitting a data signal and a user equipment, where the method includes: acquiring, by a first user equipment, a scheduling assignment signal sent by a second user equipment and a scheduling assignment signal sent by at least one third user equipment, where the second user equipment is a user equipment that performs D2D communication with the first user equipment; determining, by the first user equipment, a first time adjustment amount according to a time adjustment amount included in the acquired scheduling assignment signal; and receiving, by the first user equipment according to the first time adjustment amount and subframe information that is included in the scheduling assignment signal sent by the second user equipment, a data signal sent by the second user equipment.
Abstract:
A method for transmitting information, a base station, and a user equipment, where the method includes determining, by a user equipment, a timing advance T of a signal before sending the signal; determining, by the user equipment, an indication N of a timing adjustment according to at least the T; and sending, by the user equipment, scheduling assignment signaling that carries the N. By using allocation of non-identical time-frequency resources to different user clusters, the scheduling assignment signaling that carries the timing advance sent by the user equipment can bear more useful information, thereby avoiding unnecessary waste.
Abstract:
This application relates to the field of wireless communications technologies, and discloses an encoding method and apparatus, to improve accuracy of reliability calculation and ordering for polarized channels. The method includes: obtaining a first sequence used to encode K to-be-encoded bits, where the first sequence includes sequence numbers of N polarized channels, the first sequence is same as a second sequence or a subset of the second sequence, the second sequence comprises sequence numbers of Nmax polarized channels, and the second sequence is the sequence shown in Sequence Q11 or Table Q11, K is a positive integer, N is a positive integer power of 2, n is equal to or greater than 5, K≤N, Nmax=1024; selecting sequence numbers of K polarized channels from the first sequence; and performing polar code encoding on K the to-be-encoded bits based on the selected sequence numbers of the K polarized channels.