Abstract:
A receiving apparatus of a UE transmits at least one channel information among a plurality of channel information to a transmitting apparatus of a base station according to an adaptive transmission method set for a received signal. In addition, the receiving apparatus transmits channel state information generated on the basis of the plurality of channel information to the transmitting apparatus with a relatively long interval. The transmitting apparatus transmits traffic data to the transmitting apparatus by using the received channel state information and at least one of channel information and one of a plurality of adaptive transmission methods. Accordingly, the amount of channel information transmitted to the transmitting apparatus can be modified in accordance with an adaptive transmission method set for a received signal, thereby minimizing the amount of channel information fed back from the receiving apparatus and increasing system capacity.
Abstract:
Disclosed is a method for partitioning resource spaces, and allocating physical channels and power in an OFDMA-based cellular system. A resource within a slot is partitioned into resource spaces in common in a plurality of adjacent cells, and the partitioned resource spaces are partitioned into resource sets according to sizes of physical channels in the adjacent cells. The physical channels classified by predetermined characteristics are respectively assigned to the partitioned resource sets within the resource space. Further, the resource space for transmitting traffic channels between two different cells is partitioned into resource spaces so that the traffic channels in the same subspace may be collided with each other, and a power control is applied between the collided channels to control the interference from the adjacent cells.
Abstract:
Disclosed is a downlink signal configuring method and device, and synchronization and cell search method and device using the same in a mobile communication system. A downlink frame has plural symbols into which pilot subcarriers are distributively arranged with respect to time and frequency axes. Initial symbol synchronization and initial frequency synchronization are estimated by using a position at which autocorrelation of a cyclic prefix of a downlink signal and a valid symbol of the downlink is maximized, and cell search and integer-times frequency synchronization are estimated by using pilot subcarriers included in the estimated symbol. Fine symbol synchronization, fine frequency synchronization, and downlink frame synchronization is estimated by using an estimated cell search result. Downlink frequency and time tracking is performed, cell tracking is performed by using a position set of pilot subcarriers inserted into the downlink frame, fine symbol synchronization tracking and fine frequency synchronization tracking are repeated by using the pilot subcarriers to perform the frequency and time tracking of the downlink frame.
Abstract:
Disclosed is a method for partitioning resource spaces, and allocating physical channels and power in an OFDMA-based cellular system. A resource within a slot is partitioned into resource spaces in common in a plurality of adjacent cells, and the partitioned resource spaces are partitioned into resource sets according to sizes of physical channels in the adjacent cells. The physical channels classified by predetermined characteristics are respectively assigned to the partitioned resource sets within the resource space. Further, the resource space for transmitting traffic channels between two different cells is partitioned into resource spaces so that the traffic channels in the same subspace may be collided with each other, and a power control is applied between the collided channels to control the interference from the adjacent cells.
Abstract:
Provided are a method for allocating physical layer control information for a multimedia broadcast multicast service (MBMS) and a method for receiving physical layer control information in a wireless communication system for an MBMS. The method for allocating physical layer control information for an MBMS includes generating physical layer control information for an MBMS (S301 ), and allocating the physical layer control information to a common search space and a specific search space (S303).
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:
Integrated handover authentication technology for a next generation network (NGN) environment to which wireless access technology and mobile IP based mobility control technology are applied is provided. In a method of operating a mobile terminal MN in order to perform the integrated handover authentication in the NGN environment including an access router PAR, a target router NAR, and an authentication(AAA) server. First, a handover authentication key HKNAR which is shared by the mobile terminal and the target router and protects a fast binding update (FBU) message between the mobile terminal and the target router is generated. Then, an authentication request message AAuthReq generated using the handover authentication key HKNAR is transmitted. Thereafter, an authentication success message AAuthResp is received in response to the authentication request message AAuthReq. Accordingly, hierarchical handover can be performed according to the localization of the mobility of the mobile terminal, thereby minimizing the overhead of the authentication (AAA) server.
Abstract:
The present invention relates to a decoding method and a decoding device for detecting a transmission signal in a multiple-input multiple-output (MIMO) system. In the method, a sorted QR decomposition for calculating a unitary matrix and an upper triangular matrix, the received signal is multiplied by a transpose matrix of the unitary matrix to calculate a vector, an initial detection lattice point and a minimum eigenvalue is calculated from the vector and the upper triangular matrix, and a maximum likelihood point is detected by using the initial detection lattice point and the minimum eigenvalue. In addition, a transmission signal detecting device includes a QR decomposition unit for performing a sorted QR decomposition for the received signal, a vector calculating unit for calculating a vector by multiplying the received signal by a transpose matrix of a unitary matrix, an initial detection lattice point detecting unit for calculating an initial detection lattice point, an eigenvalue extractor for calculating a minimum eigenvalue, and a maximum likelihood point detecting unit for detecting a maximum likelihood point by using the initial detection lattice point and the minimum eigenvalue.
Abstract:
A communication resource allocation method for solving resource request imbalance content in a cell is provided. Considering a propagation environment, the base station allocates a whispering resource to a whispering area, the whispering resource being one part of the communication resource and the whispering area being a peripheral area of the first base station, and allocates a speaking resource to a speaking area, the speaking resource being other parts of the communication resource and the speaking area being a border area of a cell. When the resource request of the whispering area is increased, the base station further allocates a part of the speaking resource to the whispering area or increases a ratio of the whispering resource. When the resource request of the speaking area is increased, the base station controls a threshold value for identifying the whispering and speaking areas or increases a ratio of the speaking resource.
Abstract:
The present invention relates to a multiple antenna transmitting/receiving apparatus that performs a hybrid automatic repeat request, and a retransmission method thereof. An initial transmission signal is encoded into the form of an initial transmission matrix and transmitted to the receiving apparatus, the initial transmission matrix corresponding to a linear dispersion code, with a result of error checking performed on the initial transmission signal by the receiving apparatus. When an error is detected in the initial transmission signal, a first retransmission signal is generated by encoding the initial transmission signal in the form of a retransmission matrix and transmitted to the receiving apparatus. The retransmission matrix is formed of constituent elements of the initial transmission matrix but different from the initial transmission matrix, and corresponds to a linear dispersion code having the same capacity and diversity gain as those of the initial transmission matrix.