Abstract:
A method of managing a terminal and controlling an interference in a small base station is provided. The small base station, including: an access preamble control unit to assign a unique preamble for each terminal registered in the small base station; a transmitting/receiving unit to receive a random access request message from each of the terminals through the unique preamble, to transmit a reply message to each of the terminals, and to receive information about each of the terminals and a Radio Resource Control (RRC) connection request Message from each of the terminals in response to the reply message; and a terminal verification unit to verify whether each of the terminals is a registered terminal using the information about each of the terminals.
Abstract:
Disclosed is a transmission system for transmitting reference signals with information on the state of a channel for extracting channel state information to a relay and a macro terminal. A base station transmits to the relay or the macro terminal the information on a sub-frame, which includes the channel state information reference signal. The relay and the macro terminal receive the channel state information reference signal using the information on the sub-frame. The relay and the macro terminal extract the channel state information using the channel state information reference signal, and transmit the extracted channel state information to the base station.
Abstract:
The present invention can effectively perform data transceiving between a relay station and a base station in a wireless communication system in which the relay station is positioned by determining transmission timing and frame configuration of backhaul downlink and backhaul uplink in consideration of at least one of the signal transmission times and the transceiving switch times of the relay station, and by conducting a transceiving process according to the determined timing and frame configuration.
Abstract:
The present invention provides a device and method for transmitting a relay synchronization signal on an LTE-A system based on orthogonal frequency division having a multi-hop relay. In one example of the present invention, the device for transmitting a relay synchronization signal employs a synchronization signal for synchronization between a relay and a base station, and for synchronising one relay and a lower relay, and also for synchronization with a terminal for the purpose of having one relay monitor a neighbouring base station or relay; the synchronization signal being employed in such a way as to generate a relay synchronization signal having low correlation properties and having the same PAPR characteristics as the synchronization signal, and also to generate a frame comprising a relay synchronization signal.
Abstract:
Provided is a method of transmitting and receiving data using a persistent allocation scheme in order to effectively support a voice service between a base station and a mobile terminal in a packet based mobile communication system. When an error occurs in transmitting a control information that indicates whether to use a radio resource using the persistent allocation scheme, the base station may retransmit the control information and thereby maintain a communication quality.
Abstract:
Disclosed is a carrier management method in a carrier aggregation environment of a mobile communication system. A method for managing carrier status according to the present invention is configured to transmit a deactivation message for a subcarrier from a base station to a terminal, and change a subcarrier to a deactivated status when the deactivation message is transmitted after a predetermined amount of time elapses. The terminal receives the deactivation message transmitted and used by the base to change the subcarrier to the deactivated status when a predetermined amount of time elapses after the deactivation message is transmitted. At this point, a predetermined value may be used as the predetermined amount of time, in order to prevent the mismatch of status information on a corresponding subcarrier that the base station and the terminal manage. Accordingly, a mismatch of a subcarrier status that the base station and the terminal manage may be prevented during subcarrier deactivation by means of the method for managing carrier status according to the present invention. Therefore, problems resulting from the mismatch of a subcarrier status by the base station and the terminal may be prevented.
Abstract:
The invention relates to a technology for decreasing or eliminating communication overhead in a communication system for communicating packet data. A gateway compresses IP header (331 ), UDP/Real-time, and Transport Protocol (RTP) header and associates with the data to transmit the data to a base station. The base station compresses the GTP related header (320) using a RObust Header Compression (ROHC) scheme. UDP/RTP header (332) is integrated with the plurality of data packets, generates SCTP header. The base station generates header decompression information, and inserts it into a Packet Data Convergence Protocol (PDCP) of the LTE L2 header (310) as a header compression (HC) header (335). The relay receives the data from the base station using the Layer (Ll) and the Layer (L2) of a 3GPP LTE protocol. The base station transmits, via the relay, the header decompression information to a terminal accessing the relay, and the terminal can decompress the compressed GTP header (323) using the header decompression information.
Abstract:
A type 1 system and a type 2 system are classified according to whether carrier aggregation is used. A shared component carrier is used for both a type 1 terminal and a type 2 terminal, whereas a dedicated component carrier is used only for the type 2 terminal. Also, a type 2 base station transmits broadcast information by using a shared component carrier. In this instance, the broadcast information includes the shared broadcast information used for both the type 1 terminal and the type 2 terminal and the dedicated broadcast information only for the type 2 terminal. Also, the type 2 base station indicates component carriers that are used by the type 2 terminal, by using a semi-static component carrier indicator or a dynamic component carrier indicator.
Abstract:
The present invention relates to a hierarchical transmission apparatus and method for a variable QoS, which may hierarchically transmit packet information using an available scheme and resource between a terminal and a base station, thereby supporting various QoSs in a cellular system. The hierarchical transmission method includes generating packet information, hierarchically encoding the packet information in accordance with a control parameter to generate a plurality of hierarchical packets, adapting a Multiple Input Multiple Output (MIMO) technique to the plurality of hierarchical packets to generate hierarchical packet information, and including a plurality of antennas to transmit the hierarchical packet information for each of the plurality of antennas.
Abstract:
Disclosed is a data transmission system using carrier aggregation. The data transmission system can assign radio resources using a corresponding relationship between downlink and uplink, and transmit data using the assigned radio resources.