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 gain 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 interleaving method in a mobile communication system is provided. The interleaving method includes encoding a plurality of bits to output encoded bits in a sequence, interleaving the encoded bits based on a modulation order to generate interleaved encoded bits comprising consecutive bits having a size based on the modulation order, the consecutive bits corresponding to consecutive bits of the encoded bits, scrambling the interleaved encoded bits with a scrambling code to generate scrambled bits, and modulating the scrambled bits based on the modulation order to output at least one symbol.
Abstract:
Methods and apparatus are described for a User Equipment (UE) to transmit and for a base station to receive a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) signal in a resource of a Physical Uplink Control CHannel (PUCCH). The HARQ-ACK signal is transmitted from the UE in response to a detection of a PDCCH transmitted from the base station and conveying a DCI format that, depending on the PDCCH type, can include a HARQ-ACK PUCCH Resource Offset (HPRO) information field. The UE and the NodeB determine the PUCCH resource depending on the PDCCH type and, if the DCI format includes the HPRO, also depending on a PDCCH transmission type.
Abstract:
Methods and apparatus are provided for transmitting a reference-signal and a data signal by a user equipment in a communication system. The data signal is generated. A sequence is determined for the reference-signal. The reference-signal is transmitted based on the sequence and the data signal through at least one resource block. The sequence is determined based on sequence-hopping if the number of resource blocks is equal to or greater than the predetermined value. The sequence is determined without sequence-hopping if the number of resource blocks is less than a predetermined value.
Abstract:
Methods and apparatus are described for a Relay Node (RN) that is transparent to User Equipments to transmit, together with a base station (Node B), Reference Signals (RS) to UEs, to receive RS from UEs, to perform transmissions of Transport Blocks (TBs) to the Node B or to UEs and receptions of TBs from the Node B or from UEs, where the transmissions of TBs from the RN are for retransmissions associated with a Hybrid Automatic Repeat reQuest (HARD) process for the same TBs, and enabling the Node B to obtain control information signaled from UEs while signaling from the RN interferers with that signaling of control information.
Abstract:
Disclosed is a method for monitoring a physical downlink control channel (PDCCH) in order to enable communication over a plurality of cells in a mobile communication system, including acquiring a cell index for a cell, wherein the cell index is user equipment (UE)-specific and is informed based on radio resource control (RRC) signaling, monitoring a first PDCCH on a common search space that is for system information and is defined on a single cell for the plurality of cells, monitoring a second PDCCH on a dedicated search space defined for the cell, wherein the cell is one among the plurality of cells, and the dedicated search space is defined for each of the plurality of cells, respectively, and receiving a physical downlink shared channel (PDSCH) on the cell based on the second PDCCH, wherein the cell index is associated with one downlink frequency configured by the RRC signaling.
Abstract:
Methods and apparatuses are provided for transmitting and receiving control information. A method for transmitting control information, performed by a base station, includes transmitting, to a terminal, information associated with a resource region carrying a control channel; transmitting, to the terminal, by upper layer signaling, a plurality of values associated with control channel candidates, each of the plurality of values corresponding to each of a plurality of numbers associated with CCEs constituting one control channel candidate, wherein the each of the plurality of values indicates a number of control channel candidates to be monitored by the terminal; determining a set of control channel candidates based on an ID of the terminal and at least one of the plurality of values associated with the control channel candidates; selecting at least one control channel candidate from among the set of control channel candidates; and transmitting the control information to the terminal through the at least one selected control channel candidate in the resource region.
Abstract:
An apparatus and method are provided for transmitting control information and data in an SC-FDMA communication system. The method includes placing a reference signal onto one middle symbol among a plurality of symbols in one slot, wherein the one slot is one of two slots in one subframe; placing CQI information onto at least one symbol of other symbols except for the one middle symbol; placing the data onto the other symbols except for the one middle symbol; placing a HARQ-ACK onto two symbols, wherein the two symbols are directly adjacent to the one middle symbol; and transmitting a signal including the reference signal, the data, the CQI information, and the HARQ-ACK. The HARQ-ACK is placed onto a position of at least part of the data. The symbols are SC-FDMA symbols, the one middle symbol is a 4th symbol, the two symbols are a 3rd symbol and a 5th symbol.
Abstract:
Methods and apparatuses are provided for transmitting and receiving a signal using a sequence in a wireless communication system. The method includes receiving, from a base station, information indicating whether sequence hopping is applied or not; transmitting, to the base station, the signal using a first sequence if a number of resource blocks allocated to the user equipment is less than a predetermined value; and transmitting, to the base station, the signal using a second sequence to which the sequence hopping is applied based on the received information if the number of the resource blocks allocated to the user equipment is greater than or equal to the predetermined value. The sequence hopping is performed using a pseudo-random function, and the sequence hopping is performed in a unit of a slot.
Abstract:
Methods and apparatuses are described for transmitting acknowledgement information in a communication system. A method includes receiving one or more data TBs in one or more downlink data channels over TTIs; generating acknowledgement information comprising four acknowledgement bits, jointly representing a state of reception results for the plurality of data TBs, if the UE is configured for reception of the downlink data channels from two cells, a number of the TTIs is three or four, and a number of the data TBs is greater than a number of the acknowledgement bits; generating acknowledgement information respectively representing a reception result for each data TB by a corresponding acknowledgement bit, if the UE is configured for reception of the downlink data channels from a single cell or two cells, and a number of the TTIs is one or two; encoding the acknowledgement bits; multiplexing the encoded acknowledgement bits with uplink data; and transmitting the multiplexed acknowledgement bits and the uplink data on an uplink data channel.