Abstract:
Disclosed are a BBU power configuring method and a BBU which determine required power which is requested by a BBU to an RRH to transmit a downlink signal to a terminal based on RRH power headroom information in a cloud LAN environment in which the RRH and the BBU are separated and transmit a power allocation change request message for making a request for changing transmission power of other BBUs connected to the RRH to the other BBUs.
Abstract:
A method of transmitting signals by a transmitting side device having multiple antennas (hereinafter ‘N antennas’) is disclosed. In this method, the transmitting side device transmits reference signals (RSs) via M antenna among the N antennas, where M≦N, where one or more of M and a sequence of antenna numbers used for transmitting RSs informs a receiving side device of first information for data transmission, and where the RSs are used by the receiving side device for identifying second information for channel estimation. Transmitting side device transmits data to the receiving side device according to the first information.
Abstract:
A method for providing scalable service in a wireless communication system is disclosed. In this method, the transmitting side device transmits base layer signals and enhancement layer signals for one scalable service to a user equipment (UE) based on a HARQ (Hybrid Automatic Repeat Request) scheme. The base layer signals can be independently used at the UE without the enhancement layer signals. On the other hand, the enhancement layer signals cannot be used at the UE without the base layer signals. The transmitting side device also retransmits the base layer signals before a retransmission of the enhancement layer signals when there are both of the base layer signals and the enhancement layer signals to be retransmitted based on the HARQ scheme.
Abstract:
A method and apparatus for performing transmit (Tx) power control in a convergence network of a plurality of communication systems. A method for performing transmit power control (TPC) in a plurality of communication system convergence networks includes receiving, by a first entity of a first communication system, a TPC information request message requesting information associated with transmit power control (TPC) from a second entity of a second communication system; upon receiving a request of the TPC information request message, transmitting a first TPC information reporting message, which includes a maximum transmit (Tx) power value of the first entity and an interference signal value caused by a neighbor entity of the first entity, to the second entity; receiving a TPC command message, which includes information of the maximum Tx power value of the first entity adjusted based on the maximum Tx power value of the first entity and the interference signal value, from the second entity; and adjusting the maximum Tx power value of the first entity based on the information regarding the adjusted maximum Tx power of the first entity.
Abstract:
Disclosed are a method for transceiving a preamble in a wireless access system that supports a carrier aggregation/multi cells, and an apparatus for the same. More particularly, the method of the present invention comprises a step of transmitting a preamble to a terminal via an extension carrier that does not operate as a single carrier but operates only as a portion of a carrier aggregation. The preamble is generated based on a pseudo-random sequence.
Abstract:
The present invention relates to a method for transmitting information for synchronization of a user equipment by a base station in a wireless communication system and apparatus for the same. In one embodiment of the present invention, a source base station transmits a request message requesting uplink synchronization information according to a predetermined reference to a target base station, receives a response message including the synchronization information from the target base station in response to the requested message, and transmits the received synchronization information to one or more user equipments which are to move to a cell serviced by the target base station. The synchronization information is used when the user equipments move to the cell serviced by the target base station without a process of acquiring the synchronization information.
Abstract:
The present invention relates to a wireless access system and provides methods and apparatuses for controlling and supporting dynamic cell on or off. In an embodiment of the present invention, a method for supporting on or off of a second cell at a first cell in a wireless access system includes receiving a cell on/off state indicator message indicating on or off of the second cell from the second cell, adjusting a handover offset of the second cell, taking into account interference caused by the on or off of the second cell, and transmitting handover offset information about the adjusted handover offset to at least one of the second cell and a first User Equipment (UE).
Abstract:
Here, operation for 3D beam forming is disclosed. UE, receiving reference signals from one or more base stations (eNBs), may report feedback information comprising precoding matrix information to the one or more eNBs. The precoding matrix information indicates a first type precoding matrix for a horizontal direction and a second type precoding matrix for a vertical direction. eNBs may transmit signals, which are precoded based on a third type precoding matrix for beam forming both on the horizontal direction and the vertical direction.
Abstract:
The present invention relates to a method and an apparatus for generating a signal for low latency in a wireless communication system. The method, according to one embodiment of the present invention, for a communication device generating a situation-reporting signal for low latency and transmitting the signal to a base station in a wireless communication system comprises the steps of: generating the situation-reporting signal on the basis of a pre-set, specific situation recognized by the communication device; and transmitting the generated situation-reporting signal to the base station, wherein the situation-reporting signal may be generated so as to have a subcarrier spacing which is a pre-set number of times larger than a subcarrier spacing of a legacy communication system, the pre-set number being an integer.
Abstract:
Here, operation for 3D beam forming is disclosed. UE, receiving reference signals from one or more base stations (eNBs), may report feedback information comprising precoding matrix information to the one or more eNBs. The precoding matrix information indicates a first type precoding matrix for a horizontal direction and a second type precoding matrix for a vertical direction. eNBs may transmit signals, which are precoded based on a third type precoding matrix for beam forming both on the horizontal direction and the vertical direction.