Uplink data transmission method in wireless communication system and apparatus for the same
A method for transmitting uplink (UL) data requiring low latency in a wireless communication system according to the present invention, the method performed by a user equipment comprises transmitting contention PUSCH resource block (CPRB) indication information used for identifying a particular UE and/or particular data to an eNB; transmitting UL data to the eNB through CPRB resources of a contention based PUSCH (CP) zone; and receiving a hybrid automatic retransmit request (HARQ) response with respect to the UL data from the eNB through a physical hybrid ARQ indicator channel (PHICH).
1. A method for transmitting uplink (UL) data in a wireless communication system, the method performed by a user equipment (UE), comprising:
transmitting, to a base station (BS), a preamble related to a physical random access channel (PRACH); and
transmitting, to the BS, the UL data on a resource for a physical uplink shared channel (PUSCH),
wherein a value indicating the preamble is mapped to the resource,
wherein the resource is mapped to multiple values, which indicate each of multiple preambles, among consecutive values, and
wherein a demodulation reference signal (DMRS) with respect to the PUSCH is associated with the preamble and the resource.
2. The method of claim 1 ,
wherein the resource comprises an area from which the PUSCH is transmitted without allocation of an UL grant, and
wherein the value indicating the preamble is mapped to the DMRS by being mapped to a DMRS cyclic shift (CS) value.
3. The method of claim 1 , wherein the preamble is transmitted on the PRACH.
4. The method of claim 2 , wherein the CS value is determined through the following equation:
CS value=[index of the preamble-index of the resource]/a total number of the resource ( N ).
5. The method of claim 4 , wherein the index of the resource is given by a remainder of the index of the preamble divided by N.
6. The method of claim 5 , wherein the CS value ranges from 0 to {(a maximum index of preamble+1)/N}−1 for the resource.
7. The method of claim 2 , further comprising:
receiving, from the BS, a hybrid automatic retransmit request (HARQ) response to the UL data on a physical hybrid ARQ indicator channel (PHICH),
wherein the PHICH is assigned for the UE according to the CS value.
8. The method of claim 1 ,
wherein the preamble and the UL data are transmitted from the same subframe or on consecutive subframes.
9. The method of claim 1 , wherein a location of the resource is determined based on an index of a frequency domain.
10. A method for receiving uplink (UL) data in a wireless communication system, the method performed by a base station (BS), the method comprising:
receiving, from the UE, a preamble related to a physical random access channel (PRACH); and
receiving, from the UE, the UL data on a resource for a physical uplink shared channel (PUSCH),
wherein a value indicating the preamble is mapped to the resource,
wherein the resource is mapped to multiple values, which indicate each of multiple preambles, among consecutive values, and
wherein a demodulation reference signal (DMRS) with respect to the PUSCH is associated with the preamble and the resource.
11. A user equipment (UE) for transmitting uplink (UL) data in a wireless communication system, comprising:
a transceiver for transmitting and receiving a radio signal; and
a processor coupled to the transceiver and configured to:
transmit, to a base station (BS), a preamble related to a physical random access channel (PRACH),
transmit, to the BS, the UL data on a resource for a physical uplink shared channel (PUSCH),
wherein a value indicating the preamble is mapped to the resource,
wherein the resource is mapped to multiple values, which indicate each of multiple preambles, among consecutive values, and
wherein a demodulation reference signal (DMRS) with respect to the PUSCH is associated with the preamble and the resource.
12. The UE of claim 11 ,
wherein the resource comprises an area from which the PUSCH is transmitted without allocation of an UL grant, and
wherein the value indicating the preamble is mapped to the DMRS by being mapped to a DMRS cyclic shift (CS) value.
13. The UE of claim 12 , wherein the preamble is transmitted on the PRACH.
14. The UE of claim 12 , wherein the CS value is determined through the following equation:
CS value=[index of the preamble-index of the resource]/a total number of the resource ( N ).
15. The UE of claim 14 , wherein the index of the resource is given by a remainder of the index of the preamble divided by N.
16. The UE of claim 15 , wherein the CS value ranges from 0 to {(a maximum index of preamble+1)/N}−1 for the resource.
17. The UE of claim 12 , wherein the processor is further configured to:
receive, from the BS, a hybrid automatic retransmit request (HARQ) response to the UL data on a physical hybrid ARQ indicator channel (PHICH);
wherein the PHICH is assigned for the UE according to the CS value.
18. The UE of claim 11 ,
wherein index of the preamble and the UL data are transmitted from the same subframe or on consecutive subframes.