摘要:
A system and method for state synchronization between a base station and a mobile station in a mobile communication system. A count value indicative of a state change of the base station is received. The received current count value is compared with a previous count value previously received and stored. If the current count value is different from the previous count value, the mobile station performs a network entry procedure with the base station.
摘要:
A method and apparatus for selecting a Relay Station (RS) for a Mobile Station (MS) of a communication system are provided. The communication system is provided with the MS, a serving Base Station (BS) for providing the MS with a service and RSs for relaying signals of the MS and the BS. The MS receives RS information for increasing system capacity from the serving BS, measures reference signal strength of an RS indicated in the RS information, and selects an associated RS as a target RS for relaying a signal when the measured reference signal strength satisfies a condition.
摘要:
A scanning apparatus and method in a multi-hop relay Broadband Wireless Access (BWA) communication system are provided. In the scanning method, a Mobile Subscriber Station (MSS) sends a scan request message requesting scanning to a Base Station (BS) via a Relay Station (RS). The BS sends a scan response message containing information for the scanning of the MSS to the MSS via the RS. The BS then sends a scan notify message indicating the scanning of the MSS to the RS.
摘要:
A transmitter for minimizing a PAPR in OFDM communication system. The transmitter includes: a precoder for coding input symbols so that a signal rotation is generated, and generating a complex vector including the coded symbols; an encoder for performing a frequency-space mapping for the symbols generated as the complex vector according to a predetermined scheme; a random mapper for randomly mapping the symbols for which the frequency-space mapping has been performed on a frequency plane through at least one transmit antenna; an Inverse Fast Fourier Transform (IFFT) unit for performing an IFFT for the symbols for which the frequency-space mapping has been performed; and a gradient algorithm unit for receiving IFFTed signals from the IFFT unit and reducing the PAPR.
摘要:
An apparatus and method for transmitting/receiving channel quality information (CQI) in a communication system having a frame including subchannels corresponding to the same frequency reuse factor or different frequency reuse factors. A base station (BS) allocates at least one of the subchannels in the frame to a subscriber station (SS), and sends a transmission request for a CQI for a subchannel desired to be received, to the SS. The SS measures channel quality for individual subchannels requested by the BS in response to the CQI request, and transmits the measured channel quality to the BS.
摘要:
Disclosed is a method for transmitting a reference signal for identification of each cell in a communication system including a plurality of cells each of which is identified by a cell identifier. The method includes receiving a cell identifier, and generating a block code corresponding to the cell identifier using a predetermined block code generator matrix, and generating a first part sequence using the block code; selecting a second part sequence in accordance with the cell identifier; generating a reference signal of a frequency domain using the first part sequence and the second part sequence; converting the reference signal of the frequency domain to a reference signal of a time domain through an Inverse Fast Fourier Transform operation and transmitting the reference signal of the time domain in a predetermined reference signal transmission interval.
摘要:
A method for controlling a sleep mode operation by a mobile station (MS) in a communication system. In the sleep mode operation control method, after entering a sleep mode, the MS transitions to an awake state in a listening interval. When there is data to transmit or receive to/from a base station (BS) in the awake state, the MS causes a neutral interval following the listening interval to transition to the awake state, and transmits or receives the data. The neutral interval is an interval where transition to the awake state and sleep state is available according to the data transmission/reception of the MS operating in the sleep mode.
摘要:
A apparatus and method for estimating a channel condition of a forward link by a mobile station in a mobile communication system including the mobile station and a base station for performing an operation of transmitting/receiving data using a plurality of subcarriers having mutual orthogonality. The method comprises measuring carrier-to-interference ratio (C/I) values of the subcarriers using a signal received from the base station; determining from the received signal a subcarrier for transmitting feedback information in a given coherence bandwidth; generating feedback information to be transmitted over the determined subcarrier; and transmitting the generated feedback information to the base station as information for estimating a channel condition of the forward link.
摘要:
An apparatus and method for processing a handover complete signal in a multi-hop relay BWA communication system are provided in which a BS detects a source node of a Mobile Station (MS), when the MS completes network reentry, and transmits a handover complete message for the MS to the source node.
摘要:
Disclosed are an apparatus and method of a Relay Station (RS) in a multihop relay Broadband Wireless Access (BWA) communication system. The method includes an RS for receiving a signal level threshold of the MS from a Base Station (BS), measuring a signal level of the MS, and transmitting the MS signal level to the BS when the measured signal level is greater than the signal level threshold; and the BS for transmitting the MS signal level threshold to one or more RSs and receiving MS signal levels from the RSs.