Methods, devices and systems are provided for performing for multi-user (MU) transmission. A wireless transmit/receive unit (WTRU) may be configured to receive a frame, decode the received frame and determine whether the received frame is a null data packet (NDP) multi-user (MU) media access control (MAC) physical layer convergence protocol (PLCP) protocol data unit (PPDU) (NDP MU MAC PPDU) based on meeting an NDP condition. The NDP MU MAC PPDU may correspond to an MU transmission and may include a PLCP header which includes an NDP signal (SIG) field having MU control information. Based on the received frame meeting the NDP condition, the WTRU may be further configured to process the NDP SIG field, generate a response based on the NDP SIG field and the MU control information, and transmit the response.

A method and apparatus reduce latency of Long Term Evolution (LTE) uplink transmissions. An indication can be sent to a user equipment. The indication can indicate a set of frequency domain resource blocks for possible physical uplink shared channel transmission in an uplink subframe. A physical uplink shared channel can be received in a selected subset of resource blocks in the uplink subframe. The subset of resource blocks can be selected from the set of frequency domain resource blocks for possible physical uplink shared channel transmission based on a selection criterion. The selection criterion can use at least a resource set size acquired from the indication, a modulo function, and an identifier associated with the user equipment.

In M2M communication, data transmission is performed 4 msec after control information for dynamic scheduling is received from a base station apparatus, and the data transmission that needs immediacy has more overhead. In a case where a transmission apparatus performs data transmission to a reception apparatus, there are a first transmission mode in which a data signal based on a transmission parameter included in the received control information is transmitted, and a second transmission mode in which the control signal information is not received, and the data signal is transmitted without the reception apparatus being notified of a transmission timing of the data signal. In a case where transmission of an SR is possible and in a case where data communication is possible with the first transmission mode and the second transmission mode, the transmission apparatus configures different transmission powers in accordance with the transmission modes.

According to one embodiment, a base station includes a licensed band transmitting unit, a determining unit, and an unlicensed band transmitting unit. The licensed band transmitting unit transmits, to a terminal, a control signal for specifying a resource in a shared band to be used for data transmission by the terminal. The determining unit determines whether the resource in the shared band is idle or busy. The unlicensed band transmitting unit transmits a permission signal for permitting transmission in the shared band when the determining unit determines that the resource in the shared band is idle. The control signal or the permission signal includes an offset indicating a time from the permission signal to a start of transmission of data from the terminal to the base station with reference to the permission signal transmitted from the unlicensed band transmitting unit.

A method is provided for receiving aperiodic channel state information (CSI). A base station (BS) transmits, to a user equipment (UE), an uplink downlink control information (DCI) format. The BS receives, from the UE, aperiodic CSI through a physical uplink shared channel (PUSCH) if the BS triggers an aperiodic CSI report using a CSI request field included in the uplink DCI format. The CSI request field is either a 1-bit field or a multi-bit field. When the UE is configured with only one cell, the 1-bit field is included in the uplink DCI. When the UE is configured with more than one channel state information-reference signal (CSI-RS), the multi-bit field is included in the uplink DCI.

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.

A method of managing an access attempt for accessing a cellular network (82) is described. The method is performed by a communication device (40) and comprises sending (84), to a radio network node (60) of the cellular network (82), an access request message for requesting access to the cellular network (82), and receiving (88), from the radio network node (60), an access response message for the access request message. The access response message comprises a wait indication indicating to wait for a resumption indication before resuming the access attempt. The resumption indication indicates to resume the access attempt, and the method also comprises, in response to the received wait indication, waiting (90) to resume the access attempt. The communication device (40) is in an idle mode and the access response message is received after a random access response message. Alternatively, the communication device (40) is in a connected mode and the resumption indication is received via a physical downlink control channel. Therefore load control of load associated with the access attempt of the communication device (40) may be accomplished in a fast, easy and flexible way.

Disclosed are method for transmitting and receiving frame in wireless local area network and apparatus for the same. A communication method performed in a first station, the communication method comprises receiving, through a channel from an access point, a first frame notifying a first period for transmission or reception of a frame; and processing the first frame, wherein a second period exists between the first frame and the first period, and wherein the second period is a contention period during which stations are allowed to contend for the channel. Therefore, performance of WLAN can be enhanced.

A method comprising: receiving at a source serving node (505) an identifier associated with a group of random access channel preambles for allocation by the source serving node (505), the group of random access channel preambles having been reserved at a serving node (503) from available random access channel preambles for the serving node (503); allocating at least one from the group of random access channel preambles, in response to determining a handover from the source serving node (505) to a target serving node (507); and transmitting (515) a message to the target serving node (507), the message comprising the at least one from the group of random access channel preambles.

Some of the present implementations provide a method for a user equipment (UE) for performing a random access (RA) procedure. The method receives, at the UE, an RA configuration and a reference signal received power (RSRP) threshold. The method then determines whether a detected RSRP exceeds the RSRP threshold once the RA procedure is initiated. If the detected RSRP exceeds the RSRP threshold, the method performs a two-step RA procedure.