Method and apparatus for coexistance of device-to-device communications and cellular communications in mobile communications system
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure provides a method and an apparatus for coexistence of device-to-device communications and cellular communications in a mobile communications system.
1. A method performed by a terminal in a communication system, the method comprising:
receiving, from a base station, configuration information for a channel state information reference signal (CSI-RS), the configuration information including information on a number of CSI-RS antenna ports, a type of code division multiplexing (CDM), and a plurality of CSI-RS configurations, wherein a CSI-RS configuration is associated with locations of CSI-RS resource elements (REs) of the CSI-RS configuration;
receiving, from the base station, the CSI-RS based on the configuration information for the CSI-RS;
obtaining channel state information (CSI) based on the received CSI-RS; and
transmitting, to the base station, the CSI,
wherein in case that the number of CSI-RS antenna ports is 24 or 32 and the type of CDM indicates CDM-8, the CSI-RS is based on a plurality of RE sets for a plurality of CDM-8 patterns, respectively, and an RE set includes 8 REs in a subframe, and
wherein the 8 REs are composed of a plurality of REs from each of the plurality of CSI-RS configurations.
2. The method of claim 1 , wherein the 8 REs of the RE set for a CDM-8 pattern include 4 REs from different CSI-RS configurations.
3. A method performed by a base station in a communication system, the method comprising:
transmitting, to a terminal, configuration information for a channel state information reference signal (CSI-RS), the configuration information including information on a number of CSI-RS antenna ports, a type of code division multiplexing (CDM), and a plurality of CSI-RS configurations, wherein a CSI-RS configuration is associated with locations of CSI-RS resource elements (REs) of the CSI-RS configuration;
transmitting, to the terminal, the CSI-RS based on the configuration information for the CSI-RS; and
receiving, from the terminal, channel state information (CSI) corresponding to the CSI-RS,
wherein in case that the number of CSI-RS antenna ports is 24 or 32 and the type of CDM indicates CDM-8, the CSI-RS is based on a plurality of RE sets for a plurality of CDM-8 patterns, respectively, and an RE set includes 8 REs in a subframe, and
wherein the 8 REs are composed of a plurality of REs from each of the plurality of CSI-RS configurations.
4. The method of claim 3 , wherein the 8 REs of the RE set for a CDM-8 pattern include 4 REs from different CSI-RS configurations.
5. A terminal in a communication system, the terminal comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
receive, from a base station, configuration information for a channel state information reference signal (CSI-RS), the configuration information including information on a number of CSI-RS antenna ports, a type of code division multiplexing (CDM), and a plurality of CSI-RS configurations, wherein a CSI-RS configuration is associated with locations of CSI-RS resource elements (REs) of the CSI-RS configuration,
receive, from the base station, the CSI-RS based on the configuration information for the CSI-RS,
obtain channel state information (CSI) based on the received CSI-RS, and
transmit, to the base station, the CSI,
wherein in case that the number of CSI-RS antenna ports is 24 or 32 and the type of CDM indicates CDM-8, the CSI-RS is based on a plurality of RE sets for a plurality of CDM-8 patterns, respectively, and an RE set includes 8 REs in a subframe, and
wherein the 8 REs are composed of a plurality of REs from each of the plurality of CSI-RS configurations.
6. The terminal of claim 5 , wherein the 8 REs of the RE set for a CDM-8 pattern include 4 REs from different CSI-RS configurations.
7. A base station in a communication system, the base station comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
transmit, to a terminal, configuration information for a channel state information reference signal (CSI-RS), the configuration information including information on a number of CSI-RS antenna ports, a type of code division multiplexing (CDM), and a plurality of CSI-RS configurations, wherein a CSI-RS configuration is associated with locations of CSI-RS resource elements (REs) of the CSI-RS configuration,
transmit, to the terminal, the CSI-RS based on the configuration information for the CSI-RS; and
receiving, from the terminal, channel state information (CSI) corresponding to the CSI-RS,
wherein in case that the number of CSI-RS antenna ports is 24 or 32 and the type of CDM indicates CDM-8, the CSI-RS is based on a plurality of RE sets for a plurality of CDM-8 patterns, respectively, and an RE set includes 8 REs in a subframe, and
wherein the 8 REs are composed of a plurality of REs from each of the plurality of CSI-RS configurations.
8. The base station of claim 7 , wherein the 8 REs of the RE set for a CDM-8 pattern include 4 REs from different CSI-RS configurations.
9. The method of claim 1 , wherein the number of antenna ports is 32, 4 CSI-RS configurations are configured for 32-antenna port CSI-RS.
10. The method of claim 9 , wherein 8 REs of a first CDM-8 group include 2 REs of antenna port 15 and 16 of 4 CSI-RS configurations,
8 REs of a second CDM-8 group include 2 REs of antenna port 17 and 18 of 4 CSI-RS configurations,
8 REs of a third CDM-8 group include 2 REs of antenna port 19 and 20 of 4 CSI-RS configurations, and
8 REs of a fourth CDM-8 group include 2 REs of antenna port 21 and 22 of 4 CSI-RS configurations.
11. The method of claim 3 , wherein the number of antenna ports is 32, 4 CSI-RS configurations are configured for 32-antenna port CSI-RS.
12. The method of claim 11 , wherein 8 REs of a first CDM-8 group include 2 REs of antenna port 15 and 16 of 4 CSI-RS configurations,
8 REs of a second CDM-8 group include 2 REs of antenna port 17 and 18 of 4 CSI-RS configurations,
8 REs of a third CDM-8 group include 2 REs of antenna port 19 and 20 of 4 CSI-RS configurations, and
8 REs of a fourth CDM-8 group include 2 REs of antenna port 21 and 22 of 4 CSI-RS configurations.
13. The terminal of claim 5 , wherein the number of antenna ports is 32, 4 CSI-RS configurations are configured for 32-antenna port CSI-RS.
14. The terminal of claim 13 , wherein 8 REs of a first CDM-8 group include 2 REs of antenna port 15 and 16 of 4 CSI-RS configurations,
8 REs of a second CDM-8 group include 2 REs of antenna port 17 and 18 of 4 CSI-RS configurations,
8 REs of a third CDM-8 group include 2 REs of antenna port 19 and 20 of 4 CSI-RS configurations, and
8 REs of a fourth CDM-8 group include 2 REs of antenna port 21 and 22 of 4 CSI-RS configurations.
15. The base station of claim 7 , wherein the number of antenna ports is 32, 4 CSI-RS configurations are configured for 32-antenna port CSI-RS.
16. The base station of claim 15 , wherein 8 REs of a first CDM-8 group include 2 REs of antenna port 15 and 16 of 4 CSI-RS configurations,
8 REs of a second CDM-8 group include 2 REs of antenna port 17 and 18 of 4 CSI-RS configurations,
8 REs of a third CDM-8 group include 2 REs of antenna port 19 and 20 of 4 CSI-RS configurations, and
8 REs of a fourth CDM-8 group include 2 REs of antenna port 21 and 22 of 4 CSI-RS configurations.