In an embodiment, a system for detection of trains at railroad crossings is provided. The system comprises a field-deployed detection and reporting device comprising a microphone, a communication module, a microprocessor, and an application. When executed on the microprocessor, the application receives data describing sounds captured by the microphone and identifies frequencies of a first received sound. The application also transmits, based on the identified frequencies and a formula, a first message via the communication module. The first received sound is generated by a warning bell sounded at the railroad crossing. The first message is received by a backend server that issues a first broadcast based on receipt of the first message. The application further determines that the first received sound discontinues. Based on the determination, the application sends a second message via the module to the backend server which issues a second broadcast that the crossing is reopened.

In an embodiment, a system for detection of trains at railroad crossings is provided. The system comprises a field-deployed detection and reporting device comprising a microphone, a communication module, a microprocessor, and an application. When executed on the microprocessor, the application receives data describing sounds captured by the microphone and identifies frequencies of a first received sound. The application also transmits, based on the identified frequencies and a formula, a first message via the communication module. The first received sound is generated by a warning bell sounded at the railroad crossing. The first message is received by a backend server that issues a first broadcast based on receipt of the first message. The application further determines that the first received sound discontinues. Based on the determination, the application sends a second message via the module to the backend server which issues a second broadcast that the crossing is reopened.

A wireless communication method of a wireless communication apparatus for supporting a plurality of radio access technologies (RATs) including receiving a first downlink signal corresponding to a first RAT and a second downlink signal corresponding to a second RAT from a base station through a first frequency band, decoding the first downlink signal, detecting the second downlink signal based on a result of decoding of the first downlink signal, and decoding the detected second downlink signal to acquire data included in the second downlink signal may be provided.

A wireless communication method of a wireless communication apparatus for supporting a plurality of radio access technologies (RATs) including receiving a first downlink signal corresponding to a first RAT and a second downlink signal corresponding to a second RAT from a base station through a first frequency band, decoding the first downlink signal, detecting the second downlink signal based on a result of decoding of the first downlink signal, and decoding the detected second downlink signal to acquire data included in the second downlink signal may be provided.

A system information indication method and apparatus and a communication system. In the embodiments of this disclosure, by indicating a correspondence between an area related ID or a system information related index and system information, and/or notifying information on a change of the area related ID or system information related index, a case may be avoided where a UE needs still to obtain system information from a network side when system information of a current cell is stored, thereby efficiently lowering power consumption of the UE in acquiring the system information.

A signal multiplexing apparatus and method using layered division multiplexing are disclosed. A signal multiplexing apparatus according to an embodiment of the present invention includes a combiner configured to generate a multiplexed signal by combining a core layer signal and an enhanced layer signal at different power levels; a power normalizer configured to reduce the power of the multiplexed signal to a power level corresponding to the core layer signal; a time interleaver configured to generate a time-interleaved signal by performing interleaving that is applied to both the core layer signal and the enhanced layer signal; and a frame builder configured to generate a broadcast signal frame using the time-interleaved signal and L1 signaling information.

A signal multiplexing apparatus and method using layered division multiplexing are disclosed. A signal multiplexing apparatus according to an embodiment of the present invention includes a combiner configured to generate a multiplexed signal by combining a core layer signal and an enhanced layer signal at different power levels; a power normalizer configured to reduce the power of the multiplexed signal to a power level corresponding to the core layer signal; a time interleaver configured to generate a time-interleaved signal by performing interleaving that is applied to both the core layer signal and the enhanced layer signal; and a frame builder configured to generate a broadcast signal frame using the time-interleaved signal and L1 signaling information.

Techniques are described for expediting a generation of a means of communication between two people associated with different organizations. A first person associated with a communication platform may submit a request to the communication platform to generate an invitation to communicate via the communication platform. The first person may provide the invitation to a second person directly or via the communication platform. Responsive to receiving an indication that the second person has accepted the invitation, the communication platform may generate the means of communication between the first person and the second person. The communication platform may update respective user interfaces to include the means of communication. The communication platform may process messages and/or data between the first person and the second person that is input on the respective user interface and sent via the means of communication.

Techniques are described for expediting a generation of a means of communication between two people associated with different organizations. A first person associated with a communication platform may submit a request to the communication platform to generate an invitation to communicate via the communication platform. The first person may provide the invitation to a second person directly or via the communication platform. Responsive to receiving an indication that the second person has accepted the invitation, the communication platform may generate the means of communication between the first person and the second person. The communication platform may update respective user interfaces to include the means of communication. The communication platform may process messages and/or data between the first person and the second person that is input on the respective user interface and sent via the means of communication.

Wireless communications systems and methods related to acknowledgement/negative-acknowledgement (ACK/NACK) feedback operations for multicast communications are provided. A first user equipment (UE) receives, from a base station (BS), a multicast feedback configuration indicating a first resource configuration for a negative-acknowledgement (NACK) feedback mode; and a second resource configuration for an acknowledgement/negative-acknowledgement (ACK/NACK) feedback mode. The first UE receives, from the BS, a first multicast communication. The first UE transmits, to the BS, a NACK feedback for the first multicast communication based on the first resource configuration. The first UE receives, from the BS, a second multicast communication. The first UE transmits, to the BS, an ACK feedback or a NACK feedback for the second multicast communication based on the second resource configuration.