Method and apparatus for transmitting/receiving channels in mobile communication system supporting massive MIMO
A channel transmission/reception method and an apparatus for transmitting/receiving channels between a base station and a mobile terminal efficiently in a mobile communication supporting massive Multiple Input Multiple Output (MIMO) transmission are provided. The method includes determining a resource to which a Demodulation Reference Signal (DMRS) addressed to a terminal is mapped within a resource block, the DMRS resource being positioned in at least one of a first resource set capable of being allocated for DMRS and a second resource set symmetric with the first resource set on a time axis, and transmitting the DMRS and DMRS allocation information to the terminal.
1. A method of a base station in a mobile communication system supporting massive multiple input multiple output (MIMO), the method comprising:
determining a demodulation reference signal (DMRS) which is allocated to a terminal, a resource of the DMRS being positioned in at least one of a first multi-symbol resource set and a second multi-symbol resource set symmetric with the first multi-symbol resource set on a time axis, such that an axis of symmetry is a center of a subframe;
transmitting DMRS allocation information to the terminal; and
transmitting the DMRS and data to the terminal,
wherein the DMRS allocation information comprises a size of the DMRS resource capable of being allocated to the terminal, an allocated DMRS group, and at least one allocated DMRS antenna port within the allocated DMRS group,
wherein the DMRS group is capable of being allocated to one of the first multi-symbol resource set and the second multi-symbol resource set,
wherein the terminal that is capable of determining a total amount of resources allocated for DMRS transmission based on the DMRS allocation information, and
wherein a number of a resource element for a DMRS antenna port corresponding to the terminal is identified based on a number of consecutive resource blocks allocated to the terminal.
2. The method of claim 1 , wherein the resource block includes at least one DMRS group and the at least one DMRS group of the resource block comprises up to 4 orthogonal DMRSs, and one DMRS group is formed by shifting another DMRS group on at least one of time and frequency axes.
3. The method of claim 1 , wherein the DMRS allocation information is transmitted through one of a physical layer signaling and a higher layer signaling.
4. A method of a terminal in a mobile communication system supporting massive multiple input multiple output (MIMO), the method comprising:
receiving demodulation reference signal (DMRS) allocation information from a base station;
identifying a DMRS which is allocated to the terminal based on the DMRS allocation information, a resource of the DMRS being positioned in at least one of a first multi-symbol resource set and a second multi-symbol resource set symmetric with the first multi-symbol resource set on a time axis, such that an axis of symmetry is a center of a subframe; and
receiving the DMRS and data from the base station based on the DMRS allocation information,
wherein the DMRS allocation information comprises a size of the DMRS resource capable of being allocated to the terminal, an allocated DMRS group, and at least one allocated DMRS antenna port within the allocated DMRS group,
wherein the DMRS group is capable of being allocated to one of the first multi-symbol resource set and the second multi-symbol resource set,
wherein the terminal is capable of determining a total amount of resources allocated for DMRS transmission based on the DMRS allocation information, and
wherein a number of a resource element for a DMRS antenna port corresponding to the terminal is identified based on a number of consecutive resource blocks allocated to the terminal.
5. The method of claim 4 , wherein the resource block includes at least one DMRS group and the at least one DMRS group of the resource block comprises up to 4 orthogonal DMRSs, and one DMRS group is formed by shifting another DMRS group on at least one of time and frequency axes.
6. The method of claim 4 ,
wherein the DMRS allocation information is transmitted through physical layer signaling, and
wherein the terminal assumes that the DMRS resource capable of being allocated to the terminal, with exception of a resource for the DMRS group allocated to the terminal, is not used for DMRS and data transmission.
7. The method of claim 4 ,
wherein the terminal is notified of the DMRS resource size through higher layer signaling,
wherein the terminal is notified of the allocated DMRS group and allocated DMRS antenna port through physical layer signaling, and
wherein the terminal receives the data on the resource with exception of the DMRS resource capable of being allocated for DMRS.
8. The method of claim 4 , further comprising receiving the data on a resource with exception of a resource for the allocated DMRS group determined based on the DMRS allocation information within the resource block.
9. An apparatus of a base station in a mobile communication system supporting massive multiple input multiple output (MIMO), the apparatus comprising:
a transceiver configured to transmit and receive signals and data to and from a terminal; and
a controller configured to:
control to determine a demodulation reference signal (DMRS) which is allocated to a terminal, a resource of the DMRS being positioned in at least one of a first multi-symbol resource set and a second multi-symbol resource set symmetric with the first multi-symbol resource set on a time axis, such that an axis of symmetry is a center of a subframe,
transmit DMRS allocation information to the terminal, and
transmit the DMRS and data to the terminal,
wherein the DMRS allocation information comprises a size of the DMRS resource capable of being allocated to the terminal, an allocated DMRS group, and at least one allocated DMRS antenna port within the allocated DMRS group,
wherein the DMRS group is capable of being allocated to one of the first multi-symbol resource set and the second multi-symbol resource set,
wherein the terminal is capable of determining a total amount of resources allocated for DMRS transmission based on DMRS resources information included in the DMRS allocation information, and
wherein a number of a resource element for a DMRS antenna port corresponding to the terminal is identified based on a number of consecutive resource blocks allocated to the terminal.
10. The apparatus of claim 9 , wherein the resource block includes at least one DMRS group and the at least one DMRS group of the resource block comprises up to 4 orthogonal DMRSs, and one DMRS group is formed by shifting another DMRS group on at least one of time and frequency axes.
11. The apparatus of claim 9 , wherein the DMRS allocation information is transmitted through one of a physical layer signaling and a higher layer signaling.
12. An apparatus of a terminal in a mobile communication system supporting massive multiple input multiple output (MIMO), the apparatus comprising:
a transceiver configured to transmit and receive signals and data to and from a base station; and
a controller configured to:
control to receive demodulation reference signal (DMRS) allocation information from a base station,
identify a DMRS which is allocated to the terminal based on the DMRS allocation information, a resource of the DMRS being positioned in at least one of a first multi-symbol resource set and a second multi-symbol resource set symmetric with the first multi-symbol resource set on a time axis, such that an axis of symmetry is a center of a subframe, and
receive the DMRS and data from the base station based on the DMRS allocation information,
wherein the DMRS allocation information comprises a size of the DMRS resource capable of being allocated to the terminal, an allocated DMRS group, and at least one allocated DMRS antenna port within the allocated DMRS group,
wherein the DMRS group is capable of being allocated to one of the first multi-symbol resource set and the second multi-symbol resource set,
wherein the terminal is capable of determining a total amount of resources allocated for DMRS transmission based on the DMRS allocation information, and
wherein a number of a resource element for a DMRS antenna port corresponding to the terminal is identified based on a number of consecutive resource blocks allocated to the terminal.
13. The apparatus of claim 12 , wherein the resource block includes at least one DMRS group and the at least one DMRS group of the resource block comprises up to 4 orthogonal DMRSs, and one DMRS group is formed by shifting another DMRS group on at least one of time and frequency axes.
14. The apparatus of claim 12 ,
wherein the DMRS allocation information is transmitted through physical layer signaling, and
wherein the terminal assumes that the DMRS resource capable of being allocated to the terminal, with exception of a resource for the DMRS group allocated to the terminal, is not used for DMRS and data transmission.
15. The apparatus of claim 12 ,
wherein terminal is notified of the DMRS resource size through higher layer signaling,
wherein the terminal is notified of the allocated DMRS group and allocated DMRS antenna port through physical layer signaling, and
wherein the terminal receives the data on the DMRS resource with exception of the DMRS resource capable of being allocated for DMRS.
16. The apparatus of claim 12 , wherein the controller controls receiving the data on a resource with exception of a resource for the allocated DMRS group determined based on the DMRS allocation information within the resource block.