摘要:
Methods and apparatuses associated with multi-phase wireless handshaking. A user terminal enters handshaking with an access point. The access point may respond to an access request of the user terminal with an access assignment, and alternatively, with a message indicating an assignment will not be presently given. The handshaking process could then be completed at a later time.
摘要:
Methods and apparatuses associated with multi-phase wireless handshaking. A user terminal enters handshaking with an access point. The access point may respond to an access request of the user terminal with an access assignment, and alternatively, with a message indicating an assignment will not be presently given. The handshaking process could then be completed at a later time.
摘要:
An apparatus and method for separating data units from a received concatenated burst in a wireless communication system, and an apparatus and method for generating a concatenated data unit during transmission. If a reception end receives the burst, it determines if each data of the burst is a header of the data unit, such that it can separate the data unit from the burst. A transmission end designates individual starting points of data units to be equal to an integer multiple position of a predetermined size, and constructs a concatenated format of the data units, such that it generates the burst.
摘要:
A spatial modulation method and transmitting and receiving apparatuses using the spatial modulation method in a MIMO system are provided. The spatial modulation method uses an index of an activated antenna and a signal modulation constellation as an information source. The spatial modulation method is applied to the transmitting apparatus. The receiving apparatus uses a spatial modulation detection method in which a channel path gain is repeatedly multiplied to detect the spatially modulated signal efficiently.
摘要:
A method and system for transmitting and receiving data to prevent Adjacent Channel Interference (ACI) in a Cognitive Radio (CR) communication system are provided, in which a second system using a second frequency band measures a first channel interference that a first frequency band used by a first system causes to the second frequency band, determines a frequency spreading parameter according to the first channel interference, measures a second channel interference that the second frequency band causes to the first frequency band, receives link information from the first system according to the second channel interference, determines a power allocation map according to the link information and transmits and receives data according to the frequency spreading parameter and the power allocation map.
摘要:
A signaling method between a cognitive radio (CR) base station and a CR terminal in a CR environment, and a channel division method used for the signaling method, includes: detecting a channel usage of an incumbent system, which communicates with a CR base station; sensing an outband channel to communicate with the CR base station; receiving an EOS, which is broadcasted from the CR base station via the outband channel according to a predetermined period; and transmitting a sensing report signal with respect to the channel to the CR base station.
摘要:
A signaling method between a cognitive radio (CR) base station and a CR terminal in a CR environment, and a channel division method used for the signaling method, includes: detecting a channel usage of an incumbent system, which communicates with a CR base station; sensing an outband channel to communicate with the CR base station; receiving an EOS, which is broadcasted from the CR base station via the outband channel according to a predetermined period; and transmitting a sensing report signal with respect to the channel to the CR base station.
摘要:
A transport control method in a transmitter of a wireless communication system, which includes a transport layer having a congestion control function of transmitting data in a segment basis and retransmitting a segment if an RTO timer expires before receipt of an ACK segment is received in response to transmission of the segment and a MAC layer for detecting receipt of an ACK segment through a wireless link and transporting the detected ACK segment to the transport layer, includes temporarily storing received ACK segments in the MAC layer; detecting an average transmission rate of data segments; and transporting the stored ACK segments to the transport layer at the average transmission rate. Accordingly, by controlling an upward transport rate of a received ACK message by referring to an RTO value of a TCP in a MAC layer, unnecessary retransmission can be prevented by a congestion control function.
摘要:
Disclosed is a communication system for a software upgrade, including a user terminal (UT) for transmitting an IP address assignment request message containing software information of the UT an upgrade-providing server including upgrade data regarding every software of the UT; and a server for determining whether or not software upgrade of the UT is necessary with reference to the software information when the request message is received, and transmitting an address and upgrade information of the upgrade-providing server to the UT when the software upgrade is necessary.
摘要:
An apparatus and method for allocating a channel using an auction algorithm in a wireless communication system. The method includes measuring a data rate of each channel; selecting one of the channels, when information on the channels is received from a base station, using the received information on the channels and the measured data rate; and determining a bidding price of the selected channel. Performance of the entire system can be improved by reducing complexity as well as guaranteeing an optimal value in the channel allocation.