Abstract:
Methods and apparatus for power scaling for multi-carrier wireless terminals are disclosed. Methods and mechanisms are provided for power scaling when a multi-carrier WTRU reaches its maximum output power.
Abstract:
A method and apparatus for selecting an enhanced dedicated channel (E-DCH) transport format combination (E-TFC) in Cell_FACH state and idle mode are disclosed. A wireless transmit/receive unit (WTRU) transmits a random access channel (RACH) preamble and receives an index to an E-DCH resource in response to the RACH preamble. The WTRU may estimate a power headroom based on the maximum WTRU transmit power, power offset value, and the last successfully transmitted RACH preamble transmit power. The WTRU restricts an E-TFC based on the estimated power headroom, and selects an E-TFC based on a set of supported E-TFCs. The WTRU then generates, and transmits, a protocol data unit (PDU) based on the selected E-TFC.
Abstract:
A method and apparatus for radio link synchronization and power control in CELL_FACH state and idle mode are disclosed. A wireless transmit/receive unit (WTRU) transmits a random access channel (RACH) preamble and receives an acquisition indicator acknowledging the RACH preamble via an acquisition indicator channel (AICH) and an index to an enhanced dedicated channel (E-DCH) resource. The WTRU determines a start of an E-DCH frame. An F-DPCH timing offset is defined with respect to one of the RACH access slot and an AICH access slot carrying the acquisition indicator. A relative F-DPCH timing offset may be signaled to the WTRU and the WTRU may determine a start of an E-DCH frame based on the relative F-DPCH timing offset and timing of an AICH access slot including the acquisition indicator. The WTRU may transmit a dedicated physical control channel (DPCCH) power control preamble before starting an E-DCH transmission.
Abstract:
A wireless transmit/receive unit (WTRU) sending a first data signal via an enhanced dedicated channel (E-DCH) is provided. The WTRU may reconfigure physical channel parameters based on a reconfiguration message. The WTRU may subsequently send a second data signal without performing a synchronization procedure.
Abstract:
A wireless communication network may include multiple cells for communicating with a WTRU. One cell may be a macrocell, while another may be a small cell, such as a picocell or a femtocell. Interference control may be performed for controlling communications performed by multiple cells. Inter-cell interference in the downlink and/or uplink may be addressed by time domain resource partitioning. A control channel may be precoded separate from other uplink channels in beamforming. Multiple blank subframes may be included in communications to reduce interference with other communications on the network. Control channel power may be controlled based on WTRU measurements. Transmission power on the control channel may be adjusted based on a difference between a serving cell measurement and a non-serving cell measurement taken at the WTRU.
Abstract:
A method and an apparatus for utilizing multiple carriers are disclosed. A wireless transmit/receive unit (WTRU) capable of receiving on a single downlink carrier at a time may tune the receiver to one downlink carrier and switch the downlink carrier in accordance with a configured pattern. The WTRU may switch the carrier from an anchor carrier to a non-anchor carrier at a high speed shared control channel (HS-SCCH) sub-frame boundary, and switches back at an end of a subsequent high speed physical downlink shared channel (HS-PDSCH) subframe. The WTRU may switch the carrier at an HS-PDSCH sub-frame boundary. A WTRU capable of receiving on multiple downlink carriers simultaneously may tune the receiver to an anchor carrier and a supplementary carrier, and switch the supplementary carrier to another carrier based on a carrier switching order. The carrier switching order may be received via an HS-SCCH or via layer 2 signaling.
Abstract:
A wireless transmit/receive unit (WTRU) may configure at least one first state variable for controlling discontinuous reception (DRX) associated with a first group of cells, and at least one second state variable for controlling DRX associated with a second group of cells. In a further example, the first group of cells includes a plurality of cells and the second group of cells includes a different plurality of cells. The WTRU may perform a first DRX operation on the first group of cells based on the at least one first state variable. Also, the WTRU may a second DRX operation on the second group of cells based on the at least one second state variable. Further, the WTRU may receive a first order for DRX activation for the first group of cells. Moreover, the WTRU may activate DRX for the first group of cells based on the first order.
Abstract:
Methods, devices, and systems for congestion control in a wireless communications system. Some embodiments including receiving a plurality of zone configurations, receiving, for each of the plurality of zone configurations, a channel busy ration (CBR) threshold and a mapping of zone identities (IDs) to resource pools; and measuring a CBR of a resource pool with which the WTRU is currently configured. If the measured CBR meets a CBR threshold of a first zone configuration of the plurality, the WTRU is configured with the first zone configuration, with a zone ID based on the first zone configuration and apposition of the WTRU, and with a resource pool base on the mapping and configured zone ID.
Abstract:
Systems, methods, and instrumentalities are disclosed herein associated with the estimation of an obstacle location. A WTRU may receive configuration information regarding reference signal (RS) resources, and transmit an RS (e.g., a sounding reference signal for positioning) using a configured resource. The WTRU may receive a signal reflected from an obstacle based on the transmission of the RS and the WTRU may perform a measurement of the reflected signal. The WTRU may report a result of the measurement to a network device to assist the network device with determining the location of the obstacle.
Abstract:
Systems, methods, and instrumentalities are disclosed to manage interference caused by D2D communications. A wireless transmit receive unit (WTRU) may include a processor. The processor may be configured to perform one or more of the following. The processor may determine to send information using a device-to-device transmission via a resource pool from a plurality of resource pools. Each resource pool may be associated with a range of reference signal receive power (RSRP) values. The processor may determine a RSRP measurement of a cell associated with the WTRU. The processor may select a resource pool from the plurality of resource pools based on the RSRP measurement of the cell. The RSRP measurement of the cell may be within the range of RSRP values associated with the selected resource pool. The processor may send the information using the selected resource pool.