Wireless communication method and wireless communication device

1. A wireless communication method comprising:

identifying resource elements transmitting a reference signal in a Physical Resource Block (PRB), and

transmitting the reference signal and a data signal in the PRB, based on a coverage enhancement level represented by a number of transmission repetitions, wherein:

a number of the resource elements transmitting the reference signal in the PRB is determined by one or more of the coverage enhancement level, a channel type, and a coding rate of the data signal,

the data signal is used to transmit a System Information Block (SIB) 1, and usage of the resource elements transmitting the reference signal in the PRB is indicated by a Master Information Block (MIB) or is specified, and

usage of a plurality of resource elements transmitting a plurality of reference signals in a plurality of PRBs other than the PRB, for a plurality of SIBs other than the SIB1, is indicated by the SIB1.

2. The method according to claim 1 , wherein the number of resource elements transmitting the reference signal in the PRB for a larger coverage enhancement level is more than that for a smaller coverage enhancement level.

3. The method according to claim 1 , wherein at least a part of the reference signal transmitted in the PRB reuses existing Cell-specific Reference Signal (CRS), Demodulation Reference Signal (DMRS), Channel State Information Reference Signal (CSI-RS) and/or other existing reference signals.

4. The method according to claim 1 , wherein at least a part of the reference signal transmitted in the PRB is transmitted in resource elements used for transmitting the data signal.

5. The method according to claim 1 , wherein the number of resource elements transmitting the reference signal in the PRB for a higher coding rate is less than that for a lower coding rate.

6. The method according to claim 1 , wherein the data signal is used for transmitting Physical Downlink Shared Channel (PDSCH) or Physical Uplink Shared Channel (PUSCH), and the usage of resource elements for transmitting the reference signal in the PRB is indicated by Modulation and Coding Scheme (MCS) indicated in Downlink Control Information (DCI), which is transmitted in Physical Downlink Control Channel (PDCCH) or Enhanced Physical Downlink Control Channel (EPDCCH).

7. The method according to claim 1 , wherein the usage of resource elements transmitting the reference signal in the PRB is configured by Radio Resource Control (RRC), is predefined or is recommended by user equipment through Channel Quality Indicator (CQI).

8. The method according to claim 1 , wherein the usages of resource elements transmitting reference signals in PRBs for other SIBs are indicated by SIB1.

9. A wireless communication method comprising:

identifying resource elements transmitting a reference signal in a Physical Resource Block (PRB); and

receiving the reference signal and a data signal in the PRB transmitted based on a coverage enhancement level represented by the number of transmission repetitions, wherein:

a number of the resource elements transmitting the reference signal in the PRB is determined by one or more of the coverage enhancement level, a channel type, and a coding rate of the data signal,

the data signal is used to transmit a System Information Block (SIB) 1, and usage of resource elements transmitting the reference signal in the PRB is indicated by a Master Information Block (MIB) or is specified, and

usage of a plurality of resource elements transmitting a plurality of reference signals in a plurality of PRBs other than the PRB, for a plurality of SIBs other than the SIB1, is indicated by the SIB1.

10. The method according to claim 9 , wherein the number of resource elements transmitting the reference signal in the PRB for a larger coverage enhancement level is more than that for a smaller coverage enhancement level.

11. The method according to claim 9 , wherein the number of resource elements transmitting the reference signal in the PRB for a higher coding rate is less than that for a lower coding rate.

12. A wireless communication device comprising:

a transmitter which, in operation, transmits a reference signal and a data signal in a Physical Resource Block (PRB), based on a coverage enhancement level represented by a number of transmission repetitions, wherein:

the number of resource elements transmitting the reference signal in the PRB is determined by one or more of the coverage enhancement level, a channel type, and a coding rate of the data signal,

the data signal is used to transmit a System Information Block (SIB) 1, and usage of resource elements transmitting the reference signal in the PRB is indicated by a Master Information Block (MIB) or is specified, and

usage of a plurality of resource elements transmitting a plurality of reference signals in a plurality of PRBs other than the PRB, for a plurality of SIBs other than the SIB1, is indicated by the SIB1.

13. A wireless communication device comprising:

a receiver that receives a reference signal and a data signal in a Physical Resource Block (PRB) transmitted with a coverage enhancement level represented by a number of transmission repetitions, wherein:

the number of resource elements transmitting the reference signal in the PRB is determined by the coverage enhancement level, the channel type and/or the coding rate of the data signal,

the data signal is used to transmit a System Information Block (SIB) 1, and usage of resource elements transmitting the reference signal in the PRB is indicated by a Master Information Block (MIB) or is specified, and

usage of a plurality of resource elements transmitting a plurality of reference signals in a plurality of PRBs other than the PRB, for a plurality of SIBs other than first SIB1, is indicated by the SIB1.