There is a need to support narrowband TDD frame structure for narrowband communications. The present disclosure provides a solution by supporting one or more narrowband TDD frame structure(s) for narrowband communications. In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may determine a narrowband communication frame structure comprising a FDD frame structure or a TDD frame structure and a narrowband TDD frame structure configuration for narrowband communications from a group of narrowband TDD frame structures configurations. The apparatus may determine one or more narrowband carriers and subframes within the one or more narrowband carriers to transmit at least one of a BCH or a SIB1 based on the narrowband communication frame structure or the TDD frame structure configuration. The apparatus may transmit a PSS, an SSS, and at least one of a BCH or an SIB1 using the narrowband TDD frame structure determined for the narrowband communications. In one aspect, a carrier used for transmitting the BCH and/or the SIB may be different than a carrier used to transmit one or more of the PSS or the SSS. In another aspect, a narrowband carrier used for transmitting the BCH may be different than a narrowband carrier used to transmit one or more of the PSS or the SSS.

Methods and systems for coordinating simultaneous transmission by two or more access points over a single channel of a wireless medium are disclosed. In one aspect, a method includes determining, by a first access point, a time when the first access point and a second access point will transmit simultaneously over the channel, and transmitting, by the first access point, over the channel at the time.

The present disclosure describes a method, an apparatus, and a computer-readable medium for use in providing reverse time alignment in a wireless network. For example, the method may include obtaining a first timing value from a serving node and a second timing value from each of one or more non-serving nodes of the UE, computing one or more timing differences between the first timing value and each of one or more second timing values, and reporting the one or more timing differences to the serving node. Additionally, the disclosure describes a method, an apparatus and a computer-readable medium for use in providing time alignment in a consolidated multi-point (CoMP) transmission network by obtaining of a CoMP transmission network timing information from a plurality of user equipments (UEs) and storing the timing information for each of the plurality of UEs for communicating with the first node.

The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for receiving a MAC CE for contention-based PUSCH in a wireless communication system, the method comprising: configuring a CB grant and a CB-RNTI associated with the CB grant; transmitting a MAC PDU including an identifier of the UE and CB grant occupancy information using the CB grant; receiving a CB MAC CE including the CB grant occupancy information indicated by a PDCCH addressed to the CB-RNTI in response to the MAC PDU transmission; and transmitting next uplink data using the CB grant during time duration indicated by the CB grant occupancy information if the identifier of the UE is included in the CB MAC CE.

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive a downlink (DL) signal from a base station on one or more DL beam(s). The UE may identify a selected DL beam of the one or more DL beam(s) for communications from the base station to the UE. The UE may transmit a scheduling request message to the base station using at least one of a resource or a waveform selected based at least in part on the selected DL beam.

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive a downlink (DL) signal from a base station on DL beam(s). The UE may identify a selected DL beam of the DL beam(s) for communications from the base station to the UE. The UE may transmit a random access channel (RACH) message to the base station using at least one of a resource or a RACH waveform selected based at least in part on the selected DL beam.

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive a downlink (DL) signal from a base station on one or more DL beam(s). The UE may identify a selected DL beam of the one or more DL beam(s) for communications from the base station to the UE. The UE may transmit a beam recovery or beam tracking message to the base station using at least one of a resource or a waveform selected based at least in part on the selected DL beam.

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive a downlink (DL) signal from a base station on one or more DL beam(s). The UE may identify of a nature of correspondence between one or more receive beams at the UE and one or more transmit beams at the UE. The UE may identify a selected DL beam of the one or more DL beam(s) for communications from the base station to the UE. The UE may transmit a random access channel (RACH) message to the base station using a resource and/or a RACH waveform selected based on the selected DL beam based at least in part on the selected DL beam and the nature of correspondence.

A wireless apparatus (e.g., wireless access node, wireless device) and a method are described herein that use a block-wise Code Division Multiple Access (CDMA) scheme overlaid to a Time Division Multiple Access (TDMA) structure to communicate over a physical channel with another wireless apparatus (e.g., wireless device, wireless access node).

In a mobile communication system using a code division multiple access (CDMA) method, spreading code detection and frame/slot timing synchronization (cell search) is conducted by using a long code masked symbol. The spreading factor of the long code masked symbol is set to a value lower than spreading factors of other ordinary symbols. As a result, it becomes possible to reduce the circuit scale and power dissipation of the mobile terminal and raise the speed of cell search.