Method and device for configuring and sending downlink CSI reference signal

1. A method for configuring and sending a downlink CSI reference signal, comprising the following steps:

an eNB configuring the downlink CSI reference signal and sending configuration information of the downlink CSI reference signal to a UE, wherein the configuration information comprises a starting subframe number and/or a cycle of the downlink CSI reference signal, and wherein the configuration information is sent with signalling which identifies the starting subframe number and the cycle of the downlink CSI reference signal, in a combined or separate manner; and

the eNB sending the downlink CSI reference signal to the UE according to the configuration information of the downlink CSI reference signal, wherein the configurations of the cycle and the starting subframe number of the downlink CSI reference signal are prevented from interfering with PBCH/P-SCH/S-SCH channels.

2. The method of claim 1 , characterized in that the eNB determines the cycle of the downlink CSI reference signal based on configurations of antenna ports and/or measurement requirements of the eNB.

3. The method of claim 1 , characterized in that the cycle of the downlink CSI reference signal is configurable or constant.

4. The method of claim 1 , characterized in that the starting subframe number of the downlink CSI reference signal is cell-specific.

5. The method of claim 1 , characterized in that the starting subframe number of the downlink CSI reference signal is configurable or constant.

6. The method of claim 1 , characterized in that the downlink CSI reference signal of all ports correspond to the same starting subframe number.

7. The method of claim 1 , characterized in that the signalling comprises implicit signalling and/or explicit signalling.

8. A method for receiving and measuring, comprising:

a UE receiving configuration information of a downlink CSI reference signal from an eNB, wherein the configuration information comprises a starting subframe number and/or a cycle of the downlink CSI reference signal, wherein the configuration information is sent with signalling which identifies the starting subframe number and the cycle of the downlink CSI reference signal, in a combined or separate manner, and wherein the configurations of the cycle and the starting subframe number of the downlink CSI reference signal have been prevented from interfering with PBCH/P-SCH/S-SCH channels; and

the UE obtaining the downlink CSI reference signal according to the configuration information and performing channel measurements.

9. A device for configuring and sending, comprising a configuring module and a sending module, wherein

the configuring module is configured for configuring a downlink CSI reference signal; and

the sending module is configured for sending configuration information of the downlink CSI reference signal to a UE, wherein the configuration information comprises a starting subframe number and/or a cycle of the downlink CSI reference signal, wherein the configuration information is sent with signalling which identifies the starting subframe number and the cycle of the downlink CSI reference signal, in a combined or separate manner, and wherein the configurations of the cycle and the starting subframe number of the downlink CSI reference signal are prevented from interfering with PBCH/P-SCH/S-SCH channels.

10. The device of claim 9 , characterized in that, the configuring module determines the cycle of the downlink CSI reference signal based on configurations of antenna ports and/or measurement requirements of an eNB.

11. The device of claim 9 , characterized in that the cycle of the downlink CSI reference signal is configurable or constant.

12. The device of claim 9 , characterized in that the starting subframe number of the downlink CSI reference signal is cell-specific.

13. The device of claim 12 , characterized in that the starting subframe number of the downlink CSI reference signal is configurable or constant.

14. The device of claim 9 , characterized in that the downlink CSI reference signal of all ports correspond to the same starting subframe number.

15. The device of claim 9 , characterized in that the signalling comprises implicit signalling and/or explicit signalling.

16. A device for receiving and measuring, comprising a receiving module and a measuring module, wherein

the receiving module is configured for receiving configuration information of a downlink CSI reference signal from an eNB, wherein the configuration information comprises a starting subframe number and/or a cycle of the downlink CSI reference signal, wherein the configuration information is sent with signalling which identifies the starting subframe number and the cycle of the downlink CSI reference signal, in a combined or separate manner, and wherein the configurations of the cycle and the starting subframe number of the downlink CSI reference signal have been prevented from interfering with PBCH/P-SCH/S-SCH channels; and

the measuring module is configured for obtaining the downlink CSI reference signal according to the configuration information and performing channel measurements.