A multicast broadcast service controller is disclosed. The MBSC processes multicast broadcast data streams for transmission to access service network gateways or base stations. The MBSC includes a MBSC core processor for establishing time synchronization information used by the access service network gateways or base stations to synchronously transmit data streams. The MBSC core processor selects streams for transmission in a time diversity interval (TDI) and builds multicast broadcast (MBS) region content based on the selected streams and configuration information. The MBS region content includes timing synchronization information, resource information and MBS region content location information. A MBS region distribution module (MRD) transmits the MBS region content to the access service network gateways or base stations.

Utilizing a fast Fourier transform (FFT) to cancel a non-liner phase response of a digital infinite impulse response (IIR) lowpass filter is presented herein. An apparatus generates, via the digital IIR lowpass filter, respective discrete time domain orthogonal frequency-division multiplexing (OFDM) based digital output values comprising non-linear phase distortion; in response to removing respective cyclic prefix values from the respective discrete time domain OFDM based digital output values to obtain a group of discrete time domain OFDM based digital output values, generates, based on such values via a digital FFT, respective frequency domain OFDM based digital output values comprising a non-linear phase response of the digital FFT; and based on the non-linear phase response of the digital IIR lowpass filter, applies phase compensation to the respective frequency domain OFDM based digital output values to obtain frequency compensated frequency domain OFDM based digital output values comprising a linear phase response.

An apparatus for transmitting broadcasting signal using transmitter identification and method using the same are disclosed. An apparatus for transmitting broadcasting signal according to an embodiment of the present invention includes a waveform generator configured to generate a host broadcasting signal; a transmitter identification signal generator configured to generate a transmitter identification signal for identifying a transmitter; and a combiner configured to inject the transmitter identification signal into the host broadcasting signal in a time domain so that the transmitter identification signal is transmitted synchronously with the host broadcasting signal.

A self-contained operation using a time-unit configuration taking into consideration HARQ processes is performed. In base station, transmission section transmits a downlink signal in a downlink transmission region in a time unit composed of the downlink transmission region, an uplink transmission region, and a gap interval that is a switching point from the downlink transmission region to the uplink transmission region; and reception section receives an uplink signal in the uplink transmission region in the time unit. Each time unit includes the downlink transmission region and the uplink transmission region for each of HARQ processes.

Methods, systems, and devices for wireless communications are described. A device may receive an indication of a subcarrier spacing (SCS) for communications in a plurality of transmission time intervals (TTIs), where a TTI include a set of symbols, a corresponding set of cyclic prefixes, and a padding duration. The device may receive a control signal indicating a configuration for the padding duration, at least a portion of which may be reallocated as one or more additional symbols with corresponding one or more additional cyclic prefixes. In some examples, the one or more additional cyclic prefixes and at least a first portion of the set of cyclic prefixes may be reduced in duration in comparison with a remaining portion of the set of cyclic prefixes. The device may communicate during the padding duration using the one or more additional symbols and the corresponding one or more additional cyclic prefixes.

This disclosure provides methods, devices and systems for generating a secure long training field (LTF). In some implementations, the secure LTF may include a randomized bit sequence that is difficult, if not impossible, to replicate by any device other than the transmitting device and the intended receiving device. For example, the transmitting device may use a block cipher or stream cipher to generate a pseudorandom bit sequence and may select a subset of bits of the pseudorandom bit sequence to be mapped to a sequence of modulation symbols representing an LTF symbol of the secure LTF. More specifically, each of the modulation symbols is mapped to a respective one of a number of subcarriers spanning a bandwidth of the secure LTF. The transmitting device may further transmit a physical layer convergence protocol (PLCP) protocol data unit (PPDU) that includes the secure LTF to the receiving device.

A terminal includes a reception unit configured to receive data from another terminal, a control unit configured to identify, based on a pair of cyclic shifts, a resource in which a channel is arranged, the channel being used for transmitting and receiving a response related to a retransmission control corresponding to the data, and a transmission unit configured to transmit the response related to the retransmission control corresponding to the data using the identified resource. The pair of the cyclic shifts or an index given to the pair of cyclic shifts is determined based on a phase rotation.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may indicate support of an extended cyclic prefix (ECP), where a duration of the ECP or transmitting the ECP is based on the indication. In some cases, the UE may receive an uplink grant to transmit an uplink message with an indication of the ECP, and the UE may transmit the ECP and uplink message according to a timeline based in part on the ECP. Additionally or alternatively, an uplink channel allocation indicated in the uplink grant may include a starting point for the ECP, where the UE transmits the ECP at the starting point. In some cases, the UE may multiplex uplink control information (UCI) in the uplink channel based on a timeline that is based in part on the ECP.

Embodiments of the present disclosure relate to methods, devices and computer readable media for communication on unlicensed band. In example embodiments, a method includes determining, at a terminal device, a time interval preceding a start symbol for uplink transmission. The method further includes determining, based on a first signal generating operation for the start symbol, a second signal generating operation for the time interval. The method further includes transmitting, to a network device over the time interval, a signal generated based on the second signal generating operation.

Apparatus and methods for sounding reference signal (SRS) switching are provided. In certain embodiments, a controller internal to the power amplifier module initiates a sequence of instructions, in response to a single command, that cause the antenna switch to actuate for transmission of the sounding reference signal symbol to a second antenna. The user equipment notifies the base station associated with the mobile device to withhold blanking symbols before and after a sounding reference signal symbol.