METHOD AND APPARATUS FOR PERFORMING UPLINK/DOWNLINK TRANSMISSION IN A FLEXIBLE SUBFRAME

1 . A method performed by a User Equipment (UE) for performing UpLink/DownLink (UL/DL) transmission in a flexible subframe, comprising:

receiving downlink transmission configuration information in a flexible subframe that is different from configuration information of a subframe that has a fixed duplexing direction;

detecting downlink control information transmitted by a base station in the flexible subframe;

receiving downlink data corresponding to the downlink control information; and

reporting Hybrid Automatic Repeat reQuest (HARQ)-ACKnowledgment (ACK) for the downlink data and downlink Channel State Indication (CSI) information to the base station.

2 . The method of claim 1 , wherein receiving the downlink transmission configuration information subframe comprises at least one of:

when the flexible subframe adopts a subframe structure of a Multicast Broadcast Single Frequency Network (MBSFN), transmitting a Cell-specific Reference Signal (CRS) and downlink control information in a forepart of the flexible subframe, and transmitting one of a Physical Downlink Shared CHannel (PDSCH) subframe and a Physical Uplink Shared CHannel (PUSCH) in the data field of the flexible subframe;

transmitting no CRS in the flexible subframe, using all of Orthogonal Frequency Division Multiplexing (OFDM) symbols in the flexible subframe for one of the PDSCH transmission subframe and the PUSCH transmission; and

transmitting CRS according to a regular CRS structure in the whole subframe, and REs other than the CRS are available for downlink transmission, and transmission PUSCH in all OFDM symbols.

3 . The method of claim 2 , wherein when the flexible subframe adopts the subframe structure of the MBSFN, transmitting the CRS and the downlink control information in the forepart of the flexible subframe, and transmitting the PUSCH in the data field of the flexible subframe comprises at least one of:

obtaining the number of OFDM symbols used for downlink transmission according to a Physical Control Format Indicator CHannel (PCFICH);

configuring at least one OFDM symbol that includes the CRS at the forepart of the flexible subframe used for downlink transmission;

configuring at least one OFDM symbol that includes the CRS at the forepart of the flexible subframe used for downlink transmission, and configuring at least one OFDM symbol occupied by Physical HARQ Indicator CHannel (PHICH) transmission for downlink transmission;

configuring at least one OFDM symbol that includes the CRS of the flexible subframe for downlink transmission and configuring at least one OFDM symbol occupied by the PHICH transmission for downlink transmission when the flexible subframe is at a timing position of the PHICH;

configuring at least one OFDM symbol that includes the CRS of the flexible subframe for downlink transmission when the flexible subframe is not at the timing position of the PHICH; and

configuring the number of OFDM symbols dedicated for downlink transmission in a flexible subframe that is in a subframe structure of the MBSFN by using higher layer signaling.

4 . The method of claim 2 , further comprising:

configuring a cyclic period of a Zero Power Channel State Indication Reference Signal (ZP CSI-RS) which serves as Interference Measurement Resources (IMR), a subframe offset of the ZP CSI-RS and a Resource Element (RE) of a CSI-RS occupied by the ZP CSI-RS respectively for a flexible subframe and for a subframe dedicated for downlink transmission.

5 . The method of claim 2 , further comprising:

adopting, when the data field of the flexible subframe is for PDSCH transmission, configurations of RE mapping and Quasi Co-Location (QCL) of the PDSCH that are different from configurations of the subframe dedicated for downlink transmission for the flexible subframe.

6 . The method of claim 5 , wherein adopting configurations of RE mapping and the QCL of the PDSCH subframe comprises:

configuring a CRS RE in a subframe under four types of configurations of the subframe dedicated for downlink transmission is used for data transmission when no CRS is transmitted in the flexible subframe.

7 . The method of claim 5 , wherein performing RE mapping of the flexible subframe according to an MBSFN subframe when MBSFN information in the configuration information indicates that the flexible subframe is an MBSFN subframe, and

wherein using the CRS RE for data transmission when the MBSFN indication information indicates the flexible subframe is not an MBSFN subframe.

8 . The method of claim 5 , wherein configurations of a cyclic period and a subframe offset of a Zero Power Channel State Indication Reference Signal (ZP CSI-RS) for the flexible subframe are different from configurations of ZP CSI-RS for the subframe dedicated for downlink transmission.

9 . The method of claim 5 , wherein information for indicating Interference Measurement Resources (IMR) is added according to a predetermined configuration scheme and the UE is required to remove Resource Elements (REs) occupied by the IMR when performing rate matching and skip the REs occupied by IMR when performing RE mapping.

10 . The method of claim 2 , further comprising:

configuring N types of configuration information for PUSCH transmission; and

indicating which type of PUSCH transmission configuration is to be adopted in a DCI format scheduling uplink transmission, wherein N is greater than 1,

wherein the configuration information for the PUSCH transmission includes at least one of a start position of OFDM symbols for PUSCH transmission,

an indication of whether a cell-specific SRS symbol is configured,

a Time Advance (TA) for the PUSCH transmission, and

a Non-Zero Power Channel State Indication Reference Signal (NZP CSI-RS) for measuring downlink reference timing.

11 . The method of claim 2 , wherein when the data field in the flexible subframe is for PDSCH transmission,

wherein at least one parameter of an Enhanced Physical Downlink Control CHannel (EPDCCH) set that is different from at least one corresponding parameter of the subframe dedicated for downlink transmission is configured for the flexible subframe, and

wherein the at least one parameter of the EPDCCH set includes at least one of

a number of EPDCCH sets in which UE blind detection is configured,

a number of types of EPDCCH sets, a number of EPDCCH sets in each type of EPDCCH sets,

a number of Physical Resource Block (PRB) pairs and an index of a PRB pair occupied by an EPDCCH set,

a number of candidate EPDCCHs at each converging level in an EPDCCH set,

an OFDM symbol that is a start position of an EPDCCH transmission in an EPDCCH set, and

a Resource Element (RE) mapping scheme for an EPDCCH.

12 . The method of claim 2 , wherein when the data field in the flexible subframe is for PDSCH transmission, and

wherein configurations of Resource Element (RE) mapping and Quasi Co-Location (QCL) of Enhanced Physical Downlink Control CHannel (EPDCCH) applied to the flexible subframe are different from configurations applied to the subframe dedicated for downlink transmission or configurations of RE mapping and QCL of EPDCCH applied to the flexible subframe are identical to configurations applied to the subframe dedicated for downlink transmission by default.

13 . The method of claim 1 , further comprising:

measuring interferences in all of flexible subframes;

transmitting, in a first cell, no uplink signal on time-frequency resources used for interference measurement in the first cell; and

transmitting, in a second cell, PUSCH or PDSCH on the time-frequency resources used for interference measurement in the first cell,

wherein reporting the downlink CSI information to the base station comprises: reporting the downlink CSI information to the base station based on a result of the interference measurement.

14 . The method of claim 13 , further comprising:

configuring Interference Measurement Resources (IMR) in the flexible subframe, and avoiding performing uplink transmission in a Resource Element (RE) serving as the IMR in a current cell; or

configuring eIMR in the flexible subframe, such that the eIMR occupies only one out of every two sub carriers in an OFDM symbol, and providing availability for transmitting an uplink signal in each sub carrier of the OFDM symbol that is not occupied by the enhanced IMR (eIMR).

15 . The method of claim 13 , wherein

a flexible subframe is dedicated for downlink transmission over a time period when Interference Management Resources (IMR) are configured in the flexible subframe.

16 . A User Equipment (UE), the UE comprising:

a sending/receiving module configured to receive downlink transmission configuration information in a flexible subframe, send the configuration information to a configuring module, detect downlink control information sent by a base station in the flexible subframe, and receive downlink data corresponding to the downlink control information;

the configuring module configured to perform configurations for a flexible subframe that are different from configurations for a subframe whose duplexing direction is fixed; and

a feeding back module configured to report HARQ-ACK for the downlink data and CSI to the base station.