Abstract:
Embodiments of the present invention provide information sending and receiving methods and devices. The information sending method includes: determining, by a base station, a downlink subframe that is used to send first information to user equipment UE; and sending, by the base station, the first information to the UE by using the downlink subframe, where the downlink subframe is a first subframe, a second subframe, or a third subframe, where the first subframe includes at least two sub-physical resource block pairs, the second subframe includes at least two physical resource block pairs, and the third subframe includes at least one sub-physical resource block pair and at least one physical resource block pair. According to the embodiments of the present invention, an LTE communications system efficiently and flexibly supports various network architectures and various types of UEs.
Abstract:
A method for determining a calibration parameter of a zero intermediate frequency radio receiver, and a zero intermediate frequency radio receiver are provided. The method includes: obtaining a plurality of sub-band training signals, where a sum of the plurality of sub-band training signals is a fullband training signal; determining a sub-band calibration parameter corresponding to each of the plurality of sub-band training signals; determining a fullband calibration signal according to the plurality of sub-band training signals and the sub-band calibration parameter corresponding to each of the plurality of sub-band training signals; and performing coefficient fitting on the fullband training signal and the fullband calibration signal, to determine a fullband calibration parameter. Because sub-band calibration parameters are obtained according to a plurality of different sub-band training signals, aliasing between an image signal and a training signal is reduced. Therefore, a speed and precision of determining a calibration parameter can be improved.
Abstract:
A method for transmitting a sounding reference signal and a method and device for indicating a configuration are provided. A method for indicating a sounding reference signal configuration may include: generating at least two pieces of downlink control signaling DCI, where each of the at least two pieces of DCI includes a sounding reference signal SRS configuration information element; and transmitting the at least two pieces of DCI in a subframe to a terminal, so that the SRS configuration information elements in the at least two pieces of DCI are used to jointly indicate an SRS configuration. Solutions of embodiments of the present invention can improve accuracy and flexibility of indicating an SRS configuration.
Abstract:
Embodiments of the present disclosure provide a backoff window adjustment method, and an apparatus. In downlink transmission, a base station obtains a trigger condition for adjusting a length of a backoff window on a first channel, and adjusts the length of the backoff window of the base station on the first channel according to the obtained trigger condition for adjusting the length of the backoff window on the first channel. In uplink transmission, a user equipment (UE) obtains a trigger condition for adjusting a length of a backoff window on a first channel, and adjusts the length of the backoff window of the UE on the first channel according to the obtained trigger condition for adjusting the length of the backoff window on the first channel.
Abstract:
Embodiments of the present invention provide a data transmission method and a data transmission device. The data transmission device includes: a detection unit, configured to detect a first signal in a first cell; a determining unit, configured to determine a reference time point according to a first sequence of the detected first signal, where the reference time point is located in a first subframe of the first cell; where the determining unit is further configured to determine a position of a data channel according to the determined reference time point; and a receiving unit, configured to receive, according to the position of the data channel, control data and/or service data carried on the data channel. According to the embodiments of the present invention, resource utilization can be improved.
Abstract:
The present invention relates to the field of communications technologies, and in particular, to a data scheduling method and apparatus, so as to resolve a problem that performing data scheduling on a data node by different evolved NodeBs participating in CA may cause a case in which a range supported by a processing capability of the data node is exceeded, or may cause a case in which the data node cannot fully leverage a processing capability of the data node. The method includes: sending, by the data node, scheduling limitation indication information to a first communications node; receiving, by the data node, data scheduling information that is sent by the first communications node to the data node; and sending, by the data node, uplink data to the first communications node, or receiving, by the data node, downlink data sent by the first communications node according to the data scheduling information.
Abstract:
The present invention relates to the communications field, and discloses an information transmission method and a device, which can resolve a problem of excessively high overheads of scheduling signaling of data retransmission in an unlicensed spectrum. A specific solution is as follows: writing a data retransmission identifier of a first carrier into a preset field of a physical downlink control channel; generating a data scheduling instruction of the physical downlink control channel; sending, on a second carrier, the data scheduling instruction of the physical downlink control channel to a receiving device; and sending data that is on the first carrier on the second carrier according to the data scheduling instruction of the physical downlink control channel. The present invention is applied to information transmission.
Abstract:
Embodiments of the present invention disclose a node synchronization method and apparatus, and relate to the field of communications technologies, where the method includes: selecting, by a first node, at least one user equipment UE, where the UE is used to assist a second node to synchronize with the first node; and sending, by the first node, a notification message to the at least one UE, so that the at least one UE assists the second node to implement synchronization with the first node. The present invention is applicable to time synchronization between communications nodes.
Abstract:
A method for detecting an uplink signal includes: detecting, by a micro base station according to configuration information about an uplink signal sent by a UE, whether the uplink signal is received in an uplink receive window of a macro base station, where the macro base station and the micro base station have synchronized clock rates, there is a fixed time difference t1 between the uplink receive window of the macro base station and an uplink receive window of the micro base station, and |t1|≧0; and if it is detected that the uplink signal is not received in the uplink receive window of the macro base station, after the micro base station advances the uplink receive window of the macro base station by a length of at least one cyclic prefix, detecting, by the micro base station, the uplink signal, and sending the uplink signal to the macro base station.
Abstract:
A method for a terminal to transmit an uplink signal includes: receiving an instruction sent by a serving base station and used for determining transmit power; selecting an uplink power control formula from a plurality of uplink power control formulas according to the instruction; obtaining transmit power of an uplink signal by using the selected uplink power control formula; and transmitting an uplink signal by using the transmit power. An uplink power control formula is selected from a plurality of uplink power control formulas according to an instruction of a serving base station, so that a terminal is not only capable of selecting, according to a receiving manner, a corresponding uplink power control formula to determine a transmit signal, but also capable of using a corresponding uplink power control formula for a different configuration parameter of a non-periodical SRS to determine suitable transmit power to transmit an uplink signal.