In order to provide a transmission device and transmission method with which a response signal for random access preamble transmitted from a preamble transmission device is efficiently transmitted, setting unit in base station sets a first resource candidate group, which enables terminal capable of receiving a latch response transmitted by demodulation reference signal (DMRS) transmission to be selected, and a second resource candidate group, which enables terminal incapable of receiving a latch response transmitted by DMRS transmission but capable of receiving a latch response transmitted by cell-specific reference signal (CRS) transmission to be selected. Control unit selects DMRS transmission as the latch response transmission method when a resource in which latch preamble has been received is included in the first candidate group, but selects CRS transmission as the latch response transmission method when the resource is included in the second resource candidate group.

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 embodiments disclose a method of determining guard period for downlink-to-uplink switching in an access point of a time division duplex radio communication network. For each of a plurality of terminal devices served by the access point, the method comprising obtaining measurement information on uplink transmission delay of the terminal device due to the downlink-to-uplink switching and propagation delay; determining a time length of a guard period with respect to the terminal device based on the measurement information; assigning a time period scheduled for transmitting a uplink subframe with the time length as the guard period with respect to the terminal device; and informing the terminal device of the assignment.

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.

A communication network includes and a communication method uses a communication node configured to use a time division multiple access protocol to allow communication in the network. The time division multiple access protocol is configured to allocate time slots. The communication node includes a main transceiver and an auxiliary transceiver. The communication node is configured to listen for a synchronization signal using the main transceiver during a first window and to listen for a synchronization signal during a second window using the auxiliary transceiver.

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.

One disclosure of the present specification provides a method for receiving EPDCCH by an MTC device. The method comprises: a step for determining a first search space and a second search space for receiving EPDCCH on a first subframe and a second subframe, respectively, from among N-number of subframes, if a bundle of EPDCCHs in which the same EPDCCH is repeated on the N-number of subframes should be received, wherein each of the first and second search spaces is determined on the basis of the number of EPDCCH candidates, and determined by any one of a first case, a second case and a third case classified on the basis of a DCI format and whether a CP being used is a normal CP or an extended CP; and a step for decoding the EPDCCH in the second search space if the cases for determining the first search space and the second search space are the same.