Method and apparatus for transmitting a signal in a wireless communication system
An embodiment of the present invention relates to a method in which a base station transmits a signal in a wireless communication system, comprising: a step of generating a reception acknowledgement response to the uplink data received from a terminal; and a step of mapping the reception acknowledgement response to a downlink time-frequency resource and transmitting the mapped result. The downlink time-frequency resource is located on a resource region excluding the control region indicated by a physical control format indicator channel, and associated with the index of the resource block with which the uplink data is transmitted.
1. A method for transmitting signals by a base station (BS) in a wireless communication system, comprising:
generating an Acknowledgement/Negative Acknowledgement (ACK/NACK) response in response to uplink (UL) data received from a user equipment (UE); and
mapping the ACK/NACK response to downlink (DL) resources, and transmitting the mapped ACK/NACK response,
wherein a time domain location of the DL resources is in a data region, which is a resource region, other than a control region indicated by a physical control format indicator channel (PCFICH), and
wherein a frequency domain location of the DL resources is determined in consideration of at least one UL resource block (RB) used for receiving the UL data
wherein a frequency domain location of the DL resources is represented by an index of a DL resource block (RB), and the index of the DL RB is determined by the following equation:
n PRB e-PHICH =n PRB PUSCH mod m
wherein n is an index value, n PRB e-PHICH is the index of the DL RB, n PRB PUSCH is an index of a UL RB having a lowest RB index value among at least one UL RB, and m is an integer representing a number of DL RBs.
2. The method according to claim 1 , wherein m is any one of the number of RBs contained in a given downlink bandwidth, and wherein m is a cell-specific parameter.
3. The method according to claim 1 , wherein if the ACK/NACK response and another ACK/NACK response for a another UE are mapped to the same DL RB, the ACK/NACK response and the another ACK/NACK response are generated using different orthogonal sequences.
4. The method according to claim 3 , wherein an index of an orthogonal sequence which is used for generating the ACK/NACK response is determined in consideration of n PRB PUSCH .
5. The method according to claim 3 , wherein an index of an orthogonal sequence which is used for generating the ACK/NACK response is determined by the following equation,
n e-PHICH seq =└n PRB PUSCH /m┘
where n e-PHICH seq is the index of the orthogonal sequence.
6. The method according to claim 1 , wherein if the ACK/NACK response and another ACK/NACK response for another UE are mapped to the same DL RB, the ACK/NACK response and the another ACK/NACK response are generated using different resource elements (REs).
7. The method according to claim 1 , wherein m is either the number of RBs allocated for DL data transmission to the UE or a UE-specific parameter.
8. The method according to claim 1 , wherein m is the number of RBs attempted to be decoded for the UE configured to obtain control information.
9. The method according to claim 1 , wherein:
the frequency domain location of the DL resources varies based on a group index, and
the group index is determined by the following equation:
n e-PHICH group =n PRB PUSCH mod l
where n e-PHICH group is the group index, n PRB PUSCH is an index of a UL RB having the lowest RB index among the at least one UL RB, and l is either the number of groups or a UE-specific parameter.
10. A method for receiving signals by a user equipment (UE) in a wireless communication system, comprising:
transmitting uplink (UL) data to a base station (BS); and
receiving an Acknowledgement/Negative Acknowledgement (ACK/NACK) response in response to the UL data on downlink (DL) resources,
wherein a time domain location of the DL resources is in a data region, which is a resource region, other than a control region indicated by a physical control format indicator channel (PCFICH), and
wherein a frequency domain location of the DL resources is represented by an index of a DL resource block (RB), and the index of the DL RB is determined by the following equation:
n PRB e-PHICH =n PRB PUSCH mod m
where n is an index value, n PRB e-PHICH is the index of the DL RB, n PRB PUSCH is an index of a UL RB having a lowest RB index value among at least one UL RB, and m is an integer representing a number of DL RBs.
11. A base station (BS) device for use in a wireless communication system comprising:
a transmission (Tx) module; and
a processor,
wherein the processor generates an Acknowledgement/Negative Acknowledgement (ACK/NACK) response in response to uplink (UL) data received from a user equipment (UE), and maps the ACK/NACK response to downlink (DL) resources and transmits the mapped ACK/NACK response,
wherein a time domain location of the DL resources is in a data region, which is a resource region, other than a control region indicated by a physical control format indicator channel (PCFICH), and
wherein a frequency domain location of the DL resources is represented by an index of a DL resource block (RB), and the index of the DL RB is determined by the following equation:
n PRB e-PHICH =n PRB PUSCH mod m
where n is an index value, n PRB e-PHICH is the index of the DL RB, n PRB PUSCH is an index of a UL RB having a lowest RB index value among at least one UL RB, and m is an integer representing a number of DL RBs.
12. A user equipment (UE) device for use in a wireless communication system comprising:
a reception (Rx) module; and
a processor,
wherein the processor receives an Acknowledgement/Negative Acknowledgement (ACK/NACK) response in response to a UL data transmitted to a base station (BS) on downlink (DL) resources,
wherein a time domain location of the DL resources is in a data region, which is a resource region, other than a control region indicated by a physical control format indicator channel (PCFICH), and
wherein a frequency domain location of the DL resources is represented by an index of a DL resource block (RB), and the index of the DL RB is determined by the following equation:
n PRB e-PHICH =n PRB PUSCH mod m
where n is an index value, n PRB e-PHICH is the index of the DL RB, n PRB PUSCH is an index of a UL RB having a lowest RB index value among the at least one UL RB, and m is an integer representing a number of DL RBs.