Abstract:
Example resource allocation methods and apparatus are described. One example method includes that a terminal device receives downlink control information sent by a network device, where the downlink control information includes a resource allocation field, the resource allocation field includes formula (I)+5 bits. The terminal device determines the first resource indication value, and determines, based on the first resource indication value, a starting resource block allocated in the uplink bandwidth and a length LCRBs of consecutive resource blocks allocated in the uplink bandwidth, where M≤LCRBs≤6, and M is a positive integer greater than 1. The terminal device sends data on resources corresponding to the starting resource block and the length of the consecutive resource blocks. The methods and the devices provided in the embodiments of this application may be used in a communications system, for example, V2X, LTE-V, V2V, the Internet of Vehicles, MTC, LTE-M, M2M, or the Internet of Things.
Abstract:
Embodiments of the present invention provide an information transmission method and device. The method includes: reporting, by a UE, a CQI value to an eNB; receiving, by the UE, an MCS value sent by the eNB, where the MCS value is determined by the eNB according to the CQI value; and receiving, by the UE, PDSCH data according to the MCS value, where the CQI value and the MCS value are determined according to a second set of tables, where a modulation scheme that can be supported by the second set of tables is higher than 64QAM. The embodiments of the present invention can improve system performance and reduce waste of feedback resources.
Abstract:
A physical random access channel enhanced transmission method, a network device, and a terminal are disclosed, where implementation of the terminal is used as an example, and the terminal includes: a processor, configured to determine level information of physical random access channel PRACH enhanced transmission; and to determine a first characteristic parameter that is of PRACH enhanced transmission and that is related to the determined level information of PRACH enhanced transmission, where the first characteristic parameter includes transmit power and a preamble format; and a transmitter, configured to perform PRACH enhanced sending according to the first characteristic parameter determined by the processor.
Abstract:
Embodiments of the present invention provide a method for transmitting a pilot signal, a method for receiving a pilot signal, a user equipment (UE), and a base station. A method includes: determining a first downlink subframe according to an uplink and downlink ratio relationship, where the first downlink subframe is a first downlink subframe after a transition from uplink to downlink; transmitting a pilot signal to a UE in the first downlink subframe. Another method includes: determining, according to a preset transmit period and a subframe offset number, a second downlink subframe for transmitting a pilot signal, and transmitting the pilot signal to a UE in the second downlink subframe. According to the technical solution of the present invention, time domain resources occupied by a pilot signal are reduced, therefore, the overhead of transmitting the pilot signal is reduced.
Abstract:
The embodiments of the application disclose a ranging method including: sending a first ranging frame on a first channel, where the first ranging frame carries first ranging information through at least one first symbol; receiving a second ranging frame from a second node on the first channel, where the second ranging frame carries second ranging information through at least one second symbol; receiving first channel state information that is from the second node and corresponds to the first channel; determining second channel state information corresponding to the first channel based on the at least one second symbol; and determining channel state information corresponding to the first channel based on the first channel state information and the second channel state information, where the channel state information corresponding to the first channel is used to measure a distance between a sender of the first ranging frame and the second node.
Abstract:
Embodiments of this application belong to the field of communication technologies. In the method, a first node may send first measurement configuration information to a second node, where the first measurement configuration information indicates to measure synchronization information of a third node on a first channel. Further, the second node may obtain the synchronization information, and the first node receives the synchronization information from the second node, where the synchronization information may indicate one or more of the following information of the third node: time synchronization information, frequency synchronization information, synchronization communication domain set information, RSRP, RSRQ, SINR, or RSSI. In this way, time-frequency synchronization between different nodes in a communication system can be implemented, interference between the different nodes can be effectively reduced, and system communication performance can be improved.
Abstract:
A method includes: receiving first information from a first node through a first network, where the first information includes PLMN information that is of a second network and that is supported by the first node, a core network connection type that is of the second network and that is supported by the first node, a backhaul type of the first node in the second network, and a service type that is provided by a core network of the second network and that is supported by the first node; and determining, based on the first information, whether to access the second network via the first node, where the first network is a short-range communication network, and the second network is a cellular network or a macro coverage network.
Abstract:
An information transmission method and apparatus are provided, to reduce feedback overheads of a master node to a slave node. The information transmission method and apparatus are applied to intelligent driving or assisted driving. The method in embodiments of this application includes: each of a plurality of second nodes sends a first message to a first node. Each second node may send at least one first message, and there are N first messages in total. After receiving the N first messages, the first node may send, in multicast mode on a first resource, a second message that includes N pieces of first feedback information that are in a one-to-one correspondence with the N first messages. The method in this application may be applied to the internet of vehicles, for example, vehicle-to-everything V2X, long term evolution-vehicle LTE-V, or vehicle-to-vehicle V2V.
Abstract:
This application provides a signal transmission method and apparatus, applied to automatic driving, assisted driving, and the like. The method includes: A first device generates a first signal, where the first signal includes a first part and a second part, the second part is modulated in a phase shift keying PSK modulation scheme, the second part is encoded by using polar code, the first part is used to transmit a preconfigured sequence, a predefined sequence, or a sequence generated according to a predefined rule, and the second part is used to transmit control information. The first device sends the first signal to a second device. The second device obtains the control information. The PSK modulation scheme can improve sensitivity of a signal receive end, and improve anti-noise and anti-interference capabilities. In addition, the second part is encoded by using the polar code, which can improve anti-noise and anti-interference performance.
Abstract:
Example data transmission methods and devices are described. In one example method, data and attribute information of the data are received at a transmitting end from at least one data source. The original data is segmented based on the attribute information to obtain a plurality of data sections. A respective check code for each of the plurality of data sections is calculated based on each of the plurality of data sections. A plurality of coded blocks are sent. The plurality of coded blocks are received at a receiving end. A check is performed on data sections included in the plurality of coded blocks by using check codes included in the plurality of coded blocks. At least a data section that is successful in the check is provided for a user.