Method and apparatus for allocating uplink resources
A method and an apparatus for allocating uplink resources includes transmitting an uplink grant (UL Grant) for an unlicensed component carrier (UCC) to a plurality of terminals, wherein the UL Grant for a first terminal among the plurality of terminals includes a resource allocation information in which a transmission timing of the uplink data of a second terminal among the plurality of terminals is considered.
1. A method for transmitting a physical uplink shared channel (PUSCH) by a terminal, the method comprising:
receiving an uplink resource information from a base station through an unlicensed band; and
transmitting the PUSCH by using a partial subframe belonging to an uplink resource of the unlicensed band corresponding to the uplink resource information, the partial subframe including fewer symbols than a full subframe,
wherein the uplink resource information indicates an ending symbol of the partial subframe carrying the PUSCH.
2. The method of claim 1 , further comprising: transmitting a special signal for preventing other devices from occupying the unlicensed band before the PUSCH is transmitted when the unlicensed band is occupied by the terminal.
3. The method of claim 1 , further comprising:
performing a clear channel assessment (CCA) after receiving an uplink grant, wherein the uplink grant includes the uplink resource information; and
transmitting the PUSCH when the unlicensed band is occupied after the CCA.
4. The method of claim 3 , wherein the performing of the CCA includes: selecting a symbol for the CCA from among a plurality of symbols in a subframe; and performing the CCA at the selected symbol, wherein the selected symbol is located before the partial subframe.
5. The method of claim 1 , wherein the ending symbol of the partial subframe is a last symbol of a first slot of the partial subframe.
6. The method of claim 1 , wherein: the partial subframe includes resources of a demodulation reference signal (DM-RS) used of the PUSCH.
7. The method of claim 6 , wherein: the partial subframe includes the resources of the DM-RS when the partial subframe has at least predetermined number of symbols.
8. A terminal for transmitting a physical uplink shared channel (PUSCH), the terminal comprising:
a processor, a memory, and a radio frequency (RF) unit,
wherein the processor executes a program stored in the memory to perform:
receiving, by using the RF unit, an uplink resource information from a base station through an unlicensed band; and
transmitting, by using the RF unit, the PUSCH by using a partial subframe belonging to an uplink resource of the unlicensed band corresponding to the uplink resource information,
wherein the uplink resource information indicates an ending symbol of the partial subframe carrying the PUSCH, and the partial subframe including fewer symbols than a full subframe.
9. The terminal of claim 8 , wherein the processor executes the program to further perform:
performing a clear channel assessment (CCA) after receiving an uplink grant, wherein the uplink grant includes the uplink resource information; and
transmitting, by using the RF unit, the PUSCH when the unlicensed band is occupied after the CCA.
10. The terminal of claim 9 , wherein the processor executes the program to further perform: transmitting, by using the RF unit, a special signal for preventing other devices from occupying the unlicensed band between the CCA and the transmission of the PUSCH.
11. The terminal of claim 10 , wherein when the processor performs the performing of the CCA, the processor performs:
selecting a symbol for the CCA from among a plurality of symbols in a subframe; and
performing the CCA at the selected symbol, wherein the selected symbol is located before the partial subframe.
12. The method of claim 8 , wherein the ending symbol of the partial subframe is a last symbol of a first slot of the partial subframe.
13. The method of claim 8 , wherein: the partial subframe includes resources of a demodulation reference signal (DM-RS) used of the PUSCH.
14. The method of claim 13 , wherein: the partial subframe includes the resources of the DM-RS when the partial subframe has at least predetermined number of symbols.