Method and apparatus for receiving downlink reference signal in wireless communication system
The present disclosure relates to a pre-5 th -Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4 th -Generation (4G) communication system such as Long Term Evolution (LTE). A method for operating a terminal in a wireless communication system, the method comprises determining a time-frequency structure of a downlink reference signal, and receiving, from a base station, the downlink reference signal according to the time-frequency structure.
1. A method performed by a terminal in a wireless communication system, the method comprising:
identifying a first time-frequency resource of a first demodulation reference signal (DMRS) for a master information block (MIB) based on information carried on synchronization signals;
identifying a subcarrier spacing of the first DMRS for the MIB based on the synchronization signals;
obtaining the first DMRS for the MIB based on the first time-frequency resource; and
obtaining a second DMRS for a physical downlink shared channel (PDSCH) based on configuration information for a second time-frequency resource of the second DMRS for the PDSCH,
wherein the configuration information for the second time-frequency resource of the second DMRS for the PDSCH is received via a higher layer signaling.
2. The method of claim 1 , wherein the first DMRS for the MIB is obtained based on the subcarrier spacing, and
wherein the subcarrier spacing of the first DMRS for the MIB is same as a subcarrier spacing of the synchronization signals.
3. The method of claim 1 , wherein a number of resource elements (REs) in time-domain and a number of REs in frequency-domain between REs of the second DMRS for the PDSCH are unchanged as a subcarrier spacing of the second DMRS for the PDSCH changes, and
wherein a length of cyclic prefix (CP) changes inversely as the subcarrier spacing of the second DMRS for the PDSCH changes.
4. The method of claim 1 , wherein the configuration information indicates the second time-frequency resource as a first type or a second type, and
wherein the second time-frequency resource is obtained based on the first type or the second type indicated by the configuration information.
5. The method of claim 1 , further comprising:
performing a first channel estimation based on the obtained first DMRS for the MIB;
obtaining the MIB based on a result of the first channel estimation;
performing a second channel estimation based on the obtained second DMRS for the PDSCH; and
obtaining the PDSCH based on a result of the second channel estimation.
6. A method performed by a base station in a wireless communication (Original) system, the method comprising:
transmitting a first demodulation reference signal (DMRS) for a master information block (MIB) based on a first time-frequency resource, wherein the first time-frequency resource is based on information carried on synchronization signals, and a subcarrier spacing of the first DMRS for the MIB is based on the synchronization signals; and
transmitting a second DMRS for a physical downlink shared channel (PDSCH) based on configuration information for a second time-frequency resource, wherein the configuration information for the second time-frequency resource of the second DMRS for the PDSCH is transmitted via a higher layer signaling.
7. The method of claim 6 , wherein the first DMRS for the MIB is transmitted based on the subcarrier spacing, and
wherein the subcarrier spacing of the first DMRS for the MIB is same as a subcarrier spacing of the synchronization signals.
8. The method of claim 6 , wherein a number of resource elements (REs) in time-domain and a number of REs in frequency-domain between REs of the second DMRS for the PDSCH are unchanged as a subcarrier spacing of the second DMRS for the PDSCH changes, and
wherein a length of cyclic prefix (CP) changes inversely as the subcarrier spacing of the second DMRS for the PDSCH changes.
9. The method of claim 6 , wherein the configuration information indicates the second time-frequency resource as a first type or a second type, and
wherein the second time-frequency resource is based on the first type or the second type indicated by the configuration information.
10. The method of claim 6 , wherein the first DMRS for the MIB is for a first channel estimation for the MIB, and
wherein the second DMRS for the PDSCH is for a second channel estimation for the PDSCH.
11. A terminal in a wireless communication system, the terminal comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
identify a first time-frequency resource of a first demodulation reference signal (DMRS) for a master information block (MIB) based on information carried on synchronization signals,
identify a subcarrier spacing of the first DMRS for the MIB based on the synchronization signals,
obtain the first DMRS for the MIB based on the first time-frequency resource, and
obtain a second DMRS for a physical downlink shared channel (PDSCH) based on configuration information for a second time-frequency resource of the second DMRS for the PDSCH,
wherein the configuration information for the second time-frequency resource of the second DMRS for the PDSCH is received via a higher layer signaling.
12. The terminal of claim 11 , wherein the first DMRS for the MIB is obtained based on the subcarrier spacing, and
wherein the subcarrier spacing of the first DMRS for the MIB is same as a subcarrier spacing of the synchronization signals.
13. The terminal of claim 11 , wherein a number of resource elements (REs) in time-domain and a number of REs in frequency-domain between REs of the second DMRS for the PDSCH are unchanged as a subcarrier spacing of the second DMRS for the PDSCH changes, and
wherein a length of cyclic prefix (CP) changes inversely as the subcarrier spacing of the second DMRS for the PDSCH changes.
14. The terminal of claim 11 , wherein the configuration information indicates the second time-frequency resource as a first type or a second type, and
wherein the second time-frequency resource is obtained based on the first or the second type indicated by the configuration information.
15. The terminal of claim 11 , wherein the controller is further configured to:
perform a first channel estimation based on the obtained first DMRS for the MIB,
obtain the MIB based on a result of the first channel estimation,
perform a second channel estimation based on the obtained second DMRS for the PDSCH, and
obtain the PDSCH based on a result of the second channel estimation.
16. A base station in a wireless communication system, the base station comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
transmit a first demodulation reference signal (DMRS) for a master information block (MIB) based on a first time-frequency resource, wherein the first time-frequency resource is based on information carried on synchronization signals, and a subcarrier spacing of the first DMRS for the MIB is based on the synchronization signals, and
transmit a second DMRS for a physical downlink shared channel (PDSCH) based on configuration information for a second time-frequency resource, wherein the configuration information for the second time-frequency resource of the second DMRS for the PDSCH is transmitted via a higher layer signaling.
17. The base station of claim 16 , wherein the first DMRS for the MIB is transmitted based on the subcarrier spacing, and
wherein the subcarrier spacing of the first DMRS for the MIB is same as a subcarrier spacing of the synchronization signals.
18. The base station of claim 16 , wherein a number of resource elements (REs) in time-domain and a number of REs in frequency-domain between REs of the second DMRS for the PDSCH are unchanged as a subcarrier spacing of the second DMRS for the PDSCH changes, and
wherein a length of cyclic prefix (CP) changes inversely as the subcarrier spacing of the second DMRS for the PDSCH changes.
19. The base station of claim 16 , wherein the configuration information indicates the second time-frequency resource as a first type or a second type, and
wherein the second time-frequency resource is based on the first type or the second type indicated by the configuration information.
20. The base station of claim 16 , wherein the first DMRS for the MIB is for a first channel estimation for the MIB, and
wherein the second DMRS for the PDSCH is for a second channel estimation for the PDSCH.