Abstract:
A method of transmitting control information in a multiple antenna system includes obtaining a channel quality indicator (CQI) of a first layer, obtaining a differential value between a CQI of a second layer and the CQI of the first layer, transmitting the CQI of the first layer, and transmitting the differential value.
Abstract:
A method of transmitting feedback information in a wireless communication system is disclosed. More specifically, the method comprises a mobile station (MS) which determines whether to transmit feedback information to a base station (BS) without solicitation from the BS. After determining to do so, the MS transmits a request message to request the BS to allocate an uplink resource for transmitting at least one unsolicited header and thereafter receives the uplink resource allocation from the BS. Lastly, the MS transmits the at least one unsolicited header via the allocated uplink resource.
Abstract:
A method for transmitting a reference signal, a method for establishing a reference-signal transmission pattern, and a method for establishing a block are disclosed. The reference-signal density is adjusted according to the request degree of the channel estimation performance, and then the reference signal is transmitted to a destination. As a result, the apparatus prevents prevent resources from being unnecessarily wasted, and acquires a high channel estimation performance as necessary, resulting in an increased production yield of a system.
Abstract:
A method and device for wirelessly communicating between a mobile communication terminal and a base station, including exchanging a physical resource unit (PRU) between the base station and the mobile communication terminal, the PRU having a plurality of OFDMA symbols. Each 1th symbol includes: n1 pilots allocated per a predetermined pilot allocation scheme, the remaining LDRU·(PSC−n1) data subcarriers renumbered in order, from 0 to LDRU (PSC−n1)−1, with logically contiguous renumbered subcarriers grouped into LDRU·Lpair, 1 pairs and renumbered 0 to LDRU·Lpair, 1−1, and logically contiguous formed tone pairs (i·Lpair, 1; (i+1)·Lpair, 1−1) having a predetermined permutation formula applied to mapp into ith distributed LRUs, where i=0, 1, . . . , LDRU−1.
Abstract:
A mode adaptation method for performing mode switching between a single-user MIMO (SU-MIMO) mode and a multi-user MIMO (MU-MIMO) mode includes receiving, by the base station, a preferred MIMO mode related information from a mobile station; determining a MIMO mode based on the preferred MIMO mode related information; reporting the MIMO mode to the mobile station; and receiving a feedback information of the MIMO mode from the mobile station.
Abstract:
A method for efficiently transmitting and receiving downlink control information is disclosed. The method includes, at an base station, receiving feedback information including a preceding matrix index (PMI) from an user equipment (UE) and transmitting precoding information having a predetermined bit number according to the number of antenna ports and a transmission mode of the base station. The preceding information of a predetermined transmission mode in the preceding information includes confirmation information indicating that the base station uses a PMI which is recently received from the UE. At this time, if the confirmation information is transmitted via a specific resource block (RB) of an nth subframe, the PMI which is recently received is received via a resource block of an n−xth subframe or a subframe prior to the n−xth subframe corresponding to the specific resource block. In addition, “x” is a predetermined integer or an integer determined by upper layer signaling of a physical layer or higher.
Abstract:
A method for generating a subframe including resource distribution information is disclosed. The method for generating a subframe includes arranging resource allocation information in a subframe by sequentially allocating a localized permutation and a distributed permutation, and arranging a subframe control header including a resource unit index in a predetermined location by a system parameter, wherein the resource unit index indicates a frequency resource location of the resource allocation information. When both the localized permutation and the distributed permutation are used, a resource distribution method is transmitted to a user equipment. Therefore, an effect of the distributed permutation can be maximized without a great influence on the performance of the localized permutation, and a problem of decoding failure or latency can be prevented.
Abstract:
A method for transmitting/receiving signals in a mobile communication system, a pilot configuration of a mobile communication system capable of transmitting much more data using a conventional pilot signal, a channel estimation method, and a receiving method are disclosed. A method for transmitting a signal equipped with a training symbol in a mobile communication system which includes a transmission end capable of transmitting an output signal equipped with a training symbol for channel estimation of a reception end, includes the steps of: a) adding training symbols having the same amplitude to data symbols transmitted via subcarriers, and calculating the output signal transmitted via the subcarriers; and b) transmitting the calculated output signal via the subcarriers.
Abstract:
A method for reducing inter-cell interference and a method for transmitting a signal by a collaborative MIMO scheme, in a communication system having a multi-cell environment are disclosed. An example of a method for transmitting, by a mobile station, precoding information in a collaborative MIMO communication system includes determining a precoding matrix set including precoding matrices of one more base stations including a serving base station, based on signal strength of the serving base station, and transmitting information about the precoding matrix set to the serving base station. A mobile station in an edge of a cell performs a collaborative MIMO mode or inter-cell interference mitigation mode using the information about the precoding matrix set collaboratively with neighboring base stations.
Abstract:
A method of transmitting information in a wireless communication system is disclosed. More specifically, the method includes a base station (BS) which receives data from a mobile subscriber station (MSS) via an uplink channel. Using the antennas) received data, the BS determines quality of the uplink channel. Thereafter, the BS transmits feedback information to the MSS. Here, the feedback information is based on the determined quality of the uplink channel.