Abstract:
A method apparatus and system for efficiently transmitting and receiving channels are provided in a wireless communication system based on Orthogonal Frequency Division Multiplexing (OFDM). A multiplexing scheme differs according to a channel when a transmitter transmits a packet data channel, a common control channel and a control channel designated for a particular user. Uncoded 1-bit information is broadly dispersed in frequency and time domains using multiplexing technology for maximizing diversity in in a channel for transmitting information of at least one bit to a particular user like an acknowledgement (ACK) channel. The transmitter converts a sequence obtained by multiplexing multiple bits to be transmitted to a plurality of users to parallel signals, and broadly disperses the parallel signals in the time and frequency domains. When the uncoded 1-bit information is transmitted, reception reliability is improved because channel coding and transmission are efficiently performed using a small amount of resources.
Abstract:
An apparatus and method are provided for transmitting a DM RS associated with a PUSCH in a communication system. The method includes allocating a CS for a DM RS of a UE, and an OCC; transmitting DCI including a plurality of IEs over PDCCHs, where each of the plurality of IEs respectively includes information indicating the CS for the DM RS and the OCC; and receiving, from the UE, the DM RS associated with the PUSCH. A DM-RS sequence is acquired based on the CS for the DM RS and the OCC identified from the information indicating the CS for the DM RS and the OCC, the CS is a value for determining a cyclic shift of a reference sequence, and the CS corresponds to a predetermined OCC, and the information indicating the CS for the DM RS and the OCC consists of 3 bits.
Abstract:
A method and apparatus for transmitting, by a user equipment, a hybrid automatic repeat request acknowledgement (HARQ-ACK) are provided. The method includes identifying power of the HARQ-ACK based on transmission power control information in first downlink control information; identifying a resource for transmission of the HARQ-ACK based on transmission power control information in second downlink control information with a downlink assignment index (DAI) value greater than 1; and transmitting the HARQ-ACK based on the resource.
Abstract:
A method and apparatus are provided for transmitting data, acknowledgement information, and channel quality indicator (CQI) information. The method includes mapping a reference signal on a middle symbol in a slot; mapping the acknowledgement information on two symbols in the slot, which are directly adjacent to the middle symbol; mapping the CQI information and the data on symbols in the slot except for the middle symbol; and transmitting the reference signal, the acknowledgement information, the CQI information, and the data on the symbols.
Abstract:
Methods and apparatus are provided for the transmission of physical downlink control signaling. In one method, a User Equipment (UE) receives information associated with a physical resource block (PRB) for enhanced physical downlink control channel (EPDCCH) from a base station. Based on either first information received on physical control format indicator channel (PCFICH) or second information received on higher layer signaling, the UE determines a starting orthogonal frequency division multiple (OFDM) symbol on which EPDCCH transmission starts. The UE receives control information on the EPDDCH based on the information associated with the PRB and the determined starting OFDM symbol.
Abstract:
Disclosed are a method and apparatus for wireless communication by and in a base station (BS) and a user equipment (UE). The method by the UE includes determining a first power for transmitting both first data and control information on a first physical uplink shared channel (PUSCH), determining a second power for transmitting second data on a second PUSCH, reducing the second power if a sum of the determined first power and the determined second power exceeds a predetermined value, and transmitting the first data and the control information on the first PUSCH using the determined first power, and transmitting the second data on the second PUSCH using the reduced second power.
Abstract:
Methods and apparatuses are provided for controlling an uplink transmission power in wireless communication system. Information is received indicating a reference downlink carrier among a plurality of downlink carriers for measuring a pathloss. The pathloss of the indicated reference downlink carrier is measured. A transmit power control (TPC) command is received. The uplink transmission power is determined based on the TPC command and the measured pathloss. Data is transmitted using the determined uplink transmission power.
Abstract:
Methods and apparatus are described for User Equipment (UE) to concurrently transmit Uplink Control Information (UCI) and data information to a Node B. The Node B can configure the UE to transmit UCI together with data information in a Physical Uplink Shared CHannel (PUSCH) or separate from data information in a Physical Uplink Control CHannel (PUCCH). The UE may also determine whether to transmit UCI together with data information in the PUSCH or separate from data information in the PUCCH based on criteria involving a ratio of PUSCH resources for UCI transmission over the total PUSCH resources, a Modulation and Coding Scheme (MCS) for the data information, an absolute power difference between PUCCH and PUSCH transmissions, whether the PUSCH transmission uses frequency hopping, and/or whether spatial multiplexing is used for the data transmission.
Abstract:
A method and apparatus are provided for allocating code resources to ACK/NACK channel indexes, when UEs need ACK/NACK transmission in a wireless communication system in which a predetermined number of orthogonal cover Walsh codes is selected from among available orthogonal cover Walsh codes, at least one subset is formed, having the selected orthogonal cover Walsh codes arranged in an ascending order of cross interference, subsets are selected for use in first and second slots of a subframe, and the orthogonal cover Walsh codes of the subset selected for each slot and ZC sequence cyclic shift values are allocated to the ACK/NACK channel indexes.
Abstract:
A data transceiving method of a terminal in a mobile communication system is provided. The data transceiving method includes receiving a Time Division Duplex (TDD) configuration modification message including TDD configuration modification time information from a base station, modifying a TDD configuration based on the TDD configuration modification time information, transmitting, to the base station, at least one of a data channel and a response channel by taking into consideration a transmission period between the data channel and the response channel. and the transmission period is determined for mapping first subframes for transmitting at least one of a data channel and a response channel before the TDD configuration modification, onto second subframes for transmitting at least one of a data channel and a response channel after the TDD configuration modification.