Method and apparatus for reporting feedback information in wireless communication system
A method is provided for reporting feedback information of Multicast-Broadcast Single-Frequency Network (MBSFN) transmission by a user equipment in a wireless communication system. The user equipment receives configuration information for feedback information of the MBSFN transmission when the user equipment receives signals from a plurality of base stations based on the MBSFN transmission, and transmits the feedback information measured in a resource region according to the configuration information. The user equipment receives a common reference signal (CRS) of an antenna port 0 of an interference cell from the interference cell in an MBSFN area, and the feedback information is measured in the resource region considering a position of a symbol allocated the CRS of the antenna port 0 of the interference cell.
1. A method for reporting feedback information of Multicast-Broadcast Single-Frequency Network (MBSFN) transmission by a user equipment (UE) in a wireless communication system, the method comprising:
receiving configuration information for feedback information of the MBSFN transmission when the UE receives signals from a plurality of base stations based on the MBSFN transmission,
wherein the configuration information includes first information on a number of MBSFN subframes to be used for measurement and second information on a subframe offset informing a starting subframe for the measurement; and
transmitting the feedback information obtained from a resource region, based on the configuration information,
wherein the UE receives a common reference signal (CRS) of an antenna port 0 of an interference cell in an MBSFN area,
wherein the measurement is performed for a plurality of MBSFN subframes consecutively from the starting subframe, in the resource region, based on the first and the second information,
wherein the feedback information includes an average result value for measurement results obtained from the plurality of MBSFN subframes,
wherein each of the measurement results is obtained based on considering a position of a symbol allocated for the CRS of the antenna port 0 of the interference cell in each of the plurality of MBSFN subframes,
wherein a number of the plurality of MBSFN subframes used for obtaining the average result for the measurement is dynamically configured based on a velocity of the UE,
wherein a number of the plurality of MBSFN subframes configured when the UE is in a first velocity is smaller than a number of plurality of MBSFN subframes configured when the UE is in a second velocity, and
wherein the first velocity is a velocity faster than the second velocity.
2. The method of claim 1 , wherein when a cyclic prefix (CP) of the interference cell is an extended CP, each of the measurement results is based on an MBSFN received signal strength indicator (RSSI) measured in the position of the symbol in which the CRS of the antenna port 0 of the interference cell is transmitted.
3. The method of claim 2 , wherein each of the measurement results includes the MBSFN RSSI measured in a symbol 3 of a first slot, and a symbol 0 and a symbol 3 of a second slot in each of the plurality of MBSFN subframes.
4. The method of claim 1 , wherein when a cyclic prefix (CP) of the interference cell is a normal CP, each of the measurement results is based on an MBSFN received signal strength indicator (RSSI) measured in a symbol position at which an MBSFN symbol and all or a part of the symbol in which the CRS of the antenna port 0 of the interference cell are overlapped.
5. The method of claim 4 , wherein each of the measurement results includes the MBSFN RSSI measured in a symbol 3 and a symbol 4 of a first slot, and a symbol 0, a symbol 3 and a symbol 4 of a second slot in each of the plurality of MBSFN subframes.
6. The method of claim 1 , wherein each of the measurement results is based on an MBSFN received signal strength indicator (RSSI) measured in a symbol 3 and a symbol 4 of a first slot, and a symbol 0, a symbol 3 and a symbol 4 of a second slot in each of the plurality of MBSFN subframes, irrespective of a cyclic prefix (CP) of the interference cell.
7. The method of claim 1 , wherein each of the measurement results is based on an MBSFN received signal strength indicator (RSSI) measured in a symbol 3 of a first slot, and a symbol 0 and a symbol 3 of a second slot in each of the plurality of MBSFN subframes, irrespective of a cyclic prefix (CP) of the interference cell.
8. A user equipment (UE) for reporting feedback information of Multicast-Broadcast Single-Frequency Network (MBSFN) transmission in a wireless communication system, the UE comprising:
a transceiver; and at least one processor,
wherein the at least one processor is configured to:
control the transceiver to receive configuration information for feedback information of the MBSFN transmission when the UE receives signals from a plurality of base stations based on the MBSFN transmission,
wherein the configuration information includes first information on a number of MBSFN subframes to be used for measurement and second information on a subframe offset informing a starting subframe for the measurement, and
control the transceiver to transmit the feedback information obtained from a resource region, based on the configuration information,
wherein the UE receives a common reference signal (CRS) of an antenna port 0 of an interference cell in an MBSFN area,
wherein the measurement is performed for a plurality of MBSFN subframes consecutively sequentially from the starting subframe, in the resource region, based on the first and the second information,
wherein the feedback information includes an average result value for measurement results obtained from the plurality of MBSFN subframes,
wherein each of the measurement results is obtained based on considering a position of a symbol allocated for the CRS of the antenna port 0 of the interference cell in each of the plurality of MBSFN subframes,
wherein a number of the plurality of MBSFN subframes used for obtaining the average result for the measurement is dynamically configured based on a velocity of the UE,
wherein a number of the plurality of MBSFN subframes configured when the UE is in a first velocity is smaller than a number of plurality of MBSFN subframes configured when the UE is in a second velocity, and
wherein the first velocity is a velocity faster than the second velocity.
9. The UE of claim 8 , wherein when a cyclic prefix (CP) of the interference cell is an extended CP, each of the measurement results is based on an MBSFN received signal strength indicator (RSSI) measured in the position of the symbol in which the CRS of the antenna port 0 of the interference cell is transmitted.
10. The UE of claim 9 , wherein each of the measurement results includes the MBSFN RSSI measured in a symbol 3 of a first slot, and a symbol 0 and a symbol 3 of a second slot in each of the plurality of MBSFN subframes.
11. The UE of claim 8 , wherein when a cyclic prefix (CP) of the interference cell is a normal CP, each of the measurement results is based on an MBSFN received signal strength indicator (RSSI) measured in a symbol position at which an MBSFN symbol and all or a part of the symbol in which the CRS of the antenna port 0 of the interference cell are overlapped.
12. The UE of claim 11 , wherein each of the measurement results includes the MBSFN RSSI measured in a symbol 3 and a symbol 4 of a first slot, and a symbol 0, a symbol 3 and a symbol 4 of a second slot in each of the plurality of MBSFN subframes.
13. The UE of claim 8 , wherein each of the measurement results is based on an MBSFN received signal strength indicator (RSSI) measured in a symbol 3 and a symbol 4 of a first slot, and a symbol 0, a symbol 3 and a symbol 4 of a second slot in each of the plurality of MBSFN subframes, irrespective of a cyclic prefix (CP) of the interference cell.
14. The UE of claim 8 , wherein each of the measurement results is based on an MBSFN received signal strength indicator (RSSI) measured in a symbol 3 of a first slot, and a symbol 0 and a symbol 3 of a second slot in each of the plurality of MBSFN subframes, irrespective of a cyclic prefix (CP) of the interference cell.