An apparatus may determine a cyclic prefix (CP) length for a signal for a communication link based on a dynamic indication. The CP length may be determined from a plurality of CP lengths. The apparatus may communicate the signal using the determined CP length. Determining the CP length may be further based on at least one of a modulation and coding scheme, a subcarrier spacing, a service type, a communication link direction, a rank number, a type or a capability of the node, or a number of nodes scheduled in the same transmit time interval. Determining the CP length may include determining a first CP length for a first symbol of a plurality of symbols in the TTI, and determining a second CP length, different than the first CP length, for a second symbol of the plurality of symbols in the TTI. Various additional and alternative aspects are described herein.

A system and method for calibrating digital pre-distortion in a wireless device. A pre-distortion circuit may output a first training signal while a power amplifier of the wireless device is on, to generate a first feedback signal. The first feedback signal may be fed back to the pre-distortion circuit via a receive path of the wireless device. The pre-distortion circuit may output a second training signal while the power amplifier is off, to generate a second feedback signal. The second feedback signal may be fed back to the pre-distortion circuit via the receive path. The pre-distortion circuit may then determine one or more pre-distortion coefficients based on the first and second feedback signals.

A system and method for calibrating digital pre-distortion in a wireless device. A pre-distortion circuit may output a first training signal while a power amplifier of the wireless device is on, to generate a first feedback signal. The first feedback signal may be fed back to the pre-distortion circuit via a receive path of the wireless device. The pre-distortion circuit may output a second training signal while the power amplifier is off, to generate a second feedback signal. The second feedback signal may be fed back to the pre-distortion circuit via the receive path. The pre-distortion circuit may then determine one or more pre-distortion coefficients based on the first and second feedback signals.

Techniques for implementing MIMO communication in accordance with reciprocity based precoding are provided. The present disclosure relates to a base station for implementing multi-antenna transmission that includes a communication control unit configured to control multi-antenna transmission with user equipment and a channel state estimation unit configured to estimate a channel state with the user equipment based on an uplink reference signal from the user equipment. The communication control unit causes the user equipment to transmit the uplink reference signal in an uplink shared channel in an uplink subframe.

Techniques for implementing MIMO communication in accordance with reciprocity based precoding are provided. The present disclosure relates to a base station for implementing multi-antenna transmission that includes a communication control unit configured to control multi-antenna transmission with user equipment and a channel state estimation unit configured to estimate a channel state with the user equipment based on an uplink reference signal from the user equipment. The communication control unit causes the user equipment to transmit the uplink reference signal in an uplink shared channel in an uplink subframe.

In order to avoid interference efficiently and control the amount of radio resources that are not used for interference avoidance, the present invention provides a radio base station connected to a neighbor radio base station via inter-radio base station interface. The radio base station has: a radio communication section that performs radio communication with a user terminal using a UL/DL configuration indicating a configuration of uplink and downlink subframes in a radio frame; an interference detecting section that measures and detects interference that the radio base station suffers from; and a selecting section that uses an interference detection result as a basis to determine which to apply to each subframe, between a resource allocation-unrestricted scheme and an inter-cell uplink/downlink orthogonalization scheme.

A method and device for transmitting a service are disclosed. A terminal device receives position information of specific radio frames in a time unit, and position information of a specific subframe in each of the specific radio frames in the time unit from a base station. Every 2.sup.m radio frames in the time unit include one specific radio frame, the position information of the specific radio frames in the time unit comprises a value of a period of the specific radio frames in the time unit, and a length of the period is 2.sup.m radio frames, where m is a nonnegative integer. The terminal device receives the service carried in the specific subframe in one or more of the specific radio frames from the base station in accordance with the position information of the specific radio frames and the position information of the specific subframe.

A method and device for transmitting a service are disclosed. A terminal device receives position information of specific radio frames in a time unit, and position information of a specific subframe in each of the specific radio frames in the time unit from a base station. Every 2.sup.m radio frames in the time unit include one specific radio frame, the position information of the specific radio frames in the time unit comprises a value of a period of the specific radio frames in the time unit, and a length of the period is 2.sup.m radio frames, where m is a nonnegative integer. The terminal device receives the service carried in the specific subframe in one or more of the specific radio frames from the base station in accordance with the position information of the specific radio frames and the position information of the specific subframe.

Embodiments of the present application are for use in solving the problem of high probability of collisions occurring among existing node devices. Disclosed are a method and device for information submission and resource allocation in the V2X system. The resource allocation method comprises: a network side device assigns a subframe resource to a node device just accessing a cell and notifies the node device just accessing the cell of the assigned subframe resource; for node devices already accessing the cell, the network side device determines colliding node devices, reassigns subframe resources to the colliding node devices, and respectively notifies the colliding node devices of the reassigned subframe resources. Because employed is a solution in which resources are scheduled collectively by a network side device for node devices accessing a cell, in addition to ensuring time-division multiplexing of resources among a node device and other node devices having needs for communication in the surrounding, thus increasing system capacity, timely and effective solution of resource collisions among colliding node devices is also allowed, thus increasing the performance of communication among system node devices.

Embodiments of the present application are for use in solving the problem of high probability of collisions occurring among existing node devices. Disclosed are a method and device for information submission and resource allocation in the V2X system. The resource allocation method comprises: a network side device assigns a subframe resource to a node device just accessing a cell and notifies the node device just accessing the cell of the assigned subframe resource; for node devices already accessing the cell, the network side device determines colliding node devices, reassigns subframe resources to the colliding node devices, and respectively notifies the colliding node devices of the reassigned subframe resources. Because employed is a solution in which resources are scheduled collectively by a network side device for node devices accessing a cell, in addition to ensuring time-division multiplexing of resources among a node device and other node devices having needs for communication in the surrounding, thus increasing system capacity, timely and effective solution of resource collisions among colliding node devices is also allowed, thus increasing the performance of communication among system node devices.