Method and user equipment for receiving downlink control information, and method and base station for transmitting downlink control information
A method for downlink control information (DCI) transmission/reception is provided. The method for DCI transmission comprises: receiving, by a user equipment, a narrowband physical downlink control channel (N-PDCCH) carrying the DCI. The N-PDCCH is received using at least one of two control channel element (CCEs) on the 1 resource block (RB) only. A first CCE of the two CCEs occupies 6 subcarriers of the lowest indices among the 12 subcarriers and a second CCE of the two CCEs occupies 6 subcarriers of the highest indices among the 12 subcarriers.
1. A method for receiving a signal by a user equipment (UE) in narrowband internet of things (NB-IoT), the method comprising:
receiving, by the UE, a narrowband physical downlink control channel (N-PDCCH) carrying downlink control information (DCI); and
receiving, by the UE, a physical downlink shared channel (PDSCH) based on the DCI,
wherein a channel bandwidth of the NB-IoT is limited to 200 kHz and comprising 1 resource block (RB) which comprises 12 subcarriers in a frequency domain,
wherein the N-PDCCH is received based on at least one of two control channel elements (CCEs) on the 1 RB,
wherein a first CCE of the two CCEs occupies 6 subcarriers with indices from 0 to 5 among the 12 subcarriers and a second CCE of the two CCEs occupies 6 subcarriers with indices from 6 to 11 among the 12 subcarriers, and
wherein the N-PDCCH is received based on monitoring a N-PDCCH candidate configured with the two CCEs in case that the N-PDCCH is received with repetition.
2. The method of to claim 1 , wherein the N-PDCCH is received based on monitoring a N-PDCCH candidate configured with the first CCE and a N-PDCCH candidate configured with the second CCE in case that the N-PDCCH is received with no repetition.
3. The method of claim 1 , wherein each of the first and second CCEs has no resource element group (REG) mapped to a corresponding CCE.
4. The method of claim 1 , wherein the N-PDCCH is rate-matched within a reference signal resource on the RB.
5. A method for transmitting a signal by a base station (BS) in narrowband internet of things (NB-IoT), the method comprising:
transmitting, to a user equipment (UE), a narrowband physical downlink control channel (N-PDCCH) carrying downlink control information (DCI); and
transmitting, to the UE, a physical downlink shared channel (PDSCH) based on the DCI,
wherein a channel bandwidth of the NB-IoT is limited to 200 kHz and comprising 1 resource block (RB) which comprises 12 subcarriers in a frequency domain,
wherein the N-PDCCH is transmitted based on at least one of two control channel elements (CCEs) on the 1 RB,
wherein a first CCE of the two CCEs occupies 6 subcarriers with indices from 0 to 5 among the 12 subcarriers and a second CCE of the two CCEs occupies 6 subcarriers with indices from 6 to 11 among the 12 subcarriers, and
wherein the N-PDCCH is transmitted based on a N-PDCCH candidate configured with the two CCEs in case that the N-PDCCH is transmitted with repetition.
6. The method of claim 5 , wherein the N-PDCCH is transmitted based on a first N-PDCCH candidate configured with the first CCE or a second N-PDCCH candidate configured with the second CCE in case that the N-PDCCH is transmitted with no repetition.
7. The method of claim 5 , wherein each of the first and second CCEs has no resource element group (REG) mapped to a corresponding CCE.
8. The method of claim 5 , wherein the N-PDCCH is rate-matched within a reference signal resource on the RB.
9. A user equipment (UE) for receiving a signal in narrowband internet of things (NB-IoT), the UE comprising:
a memory; and
at least one processor coupled with the memory and configured to:
receive, by the UE, a narrowband physical downlink control channel (N-PDCCH) carrying downlink control information (DCI); and
receive, by the UE, a physical downlink shared channel (PDSCH) based on the DCI,
wherein a channel bandwidth of the NB-IoT is limited to 200 kHz and comprising 1 resource block (RB) which comprises 12 subcarriers in a frequency domain,
wherein the N-PDCCH is received based on at least one of two control channel elements (CCEs) on the 1 RB,
wherein a first CCE of the two CCEs occupies 6 subcarriers with indices from 0 to 5 among the 12 subcarriers and a second CCE of the two CCEs occupies 6 subcarriers with indices from 6 to 11 among the 12 subcarriers, and
wherein the N-PDCCH is received based on monitoring a N-PDCCH candidate configured with the two CCEs in case that the N-PDCCH is received with repetition.
10. The UE of claim 9 , wherein the N-PDCCH is received based on monitoring a N-PDCCH candidate configured with the first CCE and a N-PDCCH candidate configured with the second CCE in case that the N-PDCCH is received configured with no repetition.
11. The UE of to claim 9 , wherein each of the first and second CCEs has no resource element group (REG) mapped to a corresponding CCE.
12. The UE of claim 9 , wherein the N-PDCCH is rate-matched within a reference signal resource on the RB.
13. A base station (BS) for transmitting a signal in narrowband internet of things (NB-IoT), the BS comprising:
a memory; and
at least one processor coupled with the memory and configured to:
transmit, to a user equipment (UE), a narrowband physical downlink control channel (N-PDCCH) carrying downlink control information (DCI); and
transmit, to the UE, a physical downlink shared channel (PDSCH) based on the DCI,
wherein a channel bandwidth of the NB-IoT is limited to 200 kHz and comprising 1 resource block (RB) which comprises 12 subcarriers in a frequency domain,
wherein the N-PDCCH is transmitted based on at least one of two control channel elements (CCEs) on the 1 RB,
wherein a first CCE of the two CCEs occupies 6 subcarriers with indices from 0 to 5 among the 12 subcarriers and a second CCE of the two CCEs occupies 6 subcarriers with indices from 6 to 11 among the 12 subcarriers, and
wherein the N-PDCCH is transmitted based on a N-PDCCH candidate configured with the two CCEs in case that the N-PDCCH is transmitted with repetition.
14. The BS of claim 13 , wherein the N-PDCCH is transmitted based on a first N-PDCCH candidate configured with the first CCE or a second N-PDCCH candidate configured with the second CCE in case that the N-PDCCH is transmitted configured with no repetition.
15. The BS of claim 13 , wherein each of the first and second CCEs has no resource element group (REG) mapped to a corresponding CCE.
16. The BS of claim 13 , wherein the N-PDCCH is rate-matched within a reference signal resource on the RB.