Method and apparatus for triggering aperiodic feedback in coordinated multipoint transmission

1. An eNB, configured to trigger a User Equipment (UE) to aperiodically feed back channel state information, the eNB comprising:

a transmitter configured to transmit to the UE, a 1-bit or 2-bit downlink control information and feedback sets corresponding to the downlink control information preconfigured via Radio Resource Control (RRC) signaling, so that the UE aperiodically feeds back corresponding channel state information according to the downlink control information and the feedback sets corresponding to the downlink control information;

wherein the feedback sets corresponding to the downlink control information preconfigured via RRC signaling are classified according to configured channel state information; and

wherein the number of the feedback sets corresponding to the 1-bit downlink control information is 1, and the number of the feedback sets corresponding to the 2-bit downlink control information is 3 or 2.

2. The eNB according to claim 1 , wherein the downlink control information reuses 1 bit information or 2 bit information in a channel state information requesting domain in a format0 or format4;

when the downlink control information is 1 bit information, the feedback sets is one feedback set corresponding to downlink control information information 1; and

when the downlink control information is 2 bit information, the feedback sets are three feedback sets corresponding respectively to downlink control information 01, 10 and 11, or the feedback sets are two feedback sets corresponding respectively to downlink control information 10 and 11.

3. The eNB according to claim 1 , wherein each of the feedback sets is configured to indicate a channel state information set needing to be triggered, wherein the feedback sets are indicated via a bitmap of M bits of RRC signaling, where, M is a size of a channel state information set configured by the eNB for aperiodic feedback.

4. The eNB according to claim 1 , wherein the feedback sets are classified according to an interference type, each of the feedback sets is configured to indicate a channel state information set to which a possible interference type corresponds, wherein the feedback sets are indicated via 2 (N-1) bits of RRC signaling, where, N is a size of a measurement set of coordinated multipoint transmission.

5. A User Equipment (UE), comprising:

a receiver configured to receive 1-bit or 2-bit downlink control information and feedback sets corresponding to the downlink control information preconfigured via Radio Resource Control (RRC) signaling transmitted by an eNB; and

a transmitter configured to feed back aperiodically corresponding channel state information according to the downlink control information and the feedback sets corresponding to the downlink control information;

wherein the feedback sets corresponding to the downlink control information preconfigured via RRC signaling are classified according to configured channel state information; and

wherein the number of the feedback sets corresponding to the 1-bit downlink control information is 1, and the number of the feedback sets corresponding to the 2-bit downlink control information is 3 or 2.

6. An eNB, configured to trigger a User Equipment (UE) to aperiodically feed back channel state information, the eNB comprising:

a transmitter configured to transmit to the UE, 1-bit or 2-bit first downlink control information and feedback sets corresponding to the first downlink control information preconfigured via Radio Resource Control (RRC) signaling, so that the UE aperiodically feeds back channel state information of corresponding Carrier Aggregation (CA) according to the first downlink control information and the feedback sets corresponding to the first downlink control information; and to transmit to the UE, 1-bit or 2-bit second downlink control information and feedback sets corresponding to the second downlink control information preconfigured via RRC signaling, so that the UE aperiodically feeds back channel state information of corresponding Coordinated Multipoint Transmission (CoMP) according to the second downlink control information and the feedback sets corresponding to the second downlink control information;

wherein the feedback sets corresponding to the second downlink control information preconfigured via RRC signaling are classified according to configured channel state information; and

wherein the number of the feedback sets corresponding to the 1-bit first downlink control information is 1, the number of the feedback sets corresponding to the 1-bit second downlink control information is 1, the number of the feedback sets corresponding to the 2-bit first downlink control information is 3 or 2, and the number of the feedback sets corresponding to the 2-bit second downlink control information is 3 or 2.

7. A User Equipment (UE), comprising:

a receiver configured to receive 1-bit or 2-bit first downlink control information and feedback sets corresponding to the first downlink control information preconfigured via Radio Resource Control (RRC) signaling transmitted by an eNB;

a transmitter configured to feed back aperiodically channel state information of corresponding Carrier Aggregation (CA) according to the first downlink control information and the feedback sets corresponding to the first downlink control information;

wherein the receiver is further configured to receive 1-bit or 2-bit second downlink control information and preconfigured feedback sets corresponding to the second downlink control information transmitted by the eNB; and

wherein the transmitter is further configured to feed back aperiodically channel state information of corresponding Coordinated Multipoint Transmission (CoMP) according to the second downlink control information and the feedback sets corresponding to the second downlink control information;

wherein the preconfigured feedback sets corresponding to the second downlink control information are classified according to configured channel state information; and

wherein the number of the feedback sets corresponding to the 1-bit first downlink control information is 1, the number of the feedback sets corresponding to the 1-bit second downlink control information is 1, the number of the feedback sets corresponding to the 2-bit first downlink control information is 3 or 2, and the number of the feedback sets corresponding to the 2-bit second downlink control information is 3 or 2.

8. An eNB, configured to trigger a User Equipment (UE) to aperiodically feed back channel state information, the eNB comprising:

a transmitter configured to transmit to the UE, 2-bit downlink control information and feedback sets corresponding to the downlink control information preconfigured via Radio Resource Control (RRC) signaling, so that the UE aperiodically feeds back channel state information of corresponding Carrier Aggregation (CA) and Coordinated Multipoint Transmission (CoMP) according to the downlink control information and the feedback sets corresponding to the downlink control information;

wherein the preconfigured feedback sets corresponding to the downlink control information are classified according to configured channel state information;

wherein the preconfigured feedback sets corresponding to the downlink control information are indicated via RRC signaling, the RRC signaling comprising a carrier indication bit corresponding to each piece of configured channel state information;

and wherein the number of the feedback sets corresponding to the 2-bit downlink control information is 3 or 2.

9. A User Equipment (UE), comprising:

a receiver configured to receive 2-bit downlink control information and feedback sets corresponding to the downlink control information preconfigured via Radio Resource Control (RRC) signaling transmitted by an eNB; and

a transmitter configured to feed back aperiodically channel state information of corresponding Carrier Aggregation (CA) and Coordinated Multipoint Transmission (CoMP) according to the downlink control information and the feedback sets corresponding to the downlink control information;

wherein the preconfigured feedback sets corresponding to the downlink control information are classified according to configured channel state information;

wherein the preconfigured feedback sets corresponding to the downlink control information are indicated via RRC signaling, the RRC signaling comprising a carrier indication bit corresponding to each piece of configured channel state information;

and wherein the number of the feedback sets corresponding to the 2-bit downlink control information is 3 or 2.

10. An eNB, configured to trigger a User Equipment (UE) to aperiodically feed back channel state information, the eNB comprising:

a transmitter configured to transmit to the UE, 2-bit downlink control information and feedback sets corresponding to the downlink control information preconfigured via Radio Resource Control (RRC) signaling, so that the UE aperiodically feeds back channel state information of corresponding Carrier Aggregation (CA) and Coordinated Multipoint Transmission (CoMP) according to the downlink control information and the feedback sets corresponding to the downlink control information;

wherein the preconfigured feedback sets corresponding to the downlink control information are classified according to configured channel state information;

wherein the preconfigured feedback sets corresponding to the downlink control information are indicated via RRC signaling, the RRC signaling comprising a carrier indication bit for indicating configured carriers, and a channel state information indication bit for indicating configured channel state information corresponding to each configured carrier; and

wherein the number of the feedback sets corresponding to the 2-bit downlink control information is 3 or 2.

11. A User Equipment (UE), comprising:

a receiver configured to receive 2-bit downlink control information and feedback sets corresponding to the downlink control information preconfigured via Radio Resource Control (RRC) signaling transmitted by an eNB; and

a transmitter configured to feed back aperiodically channel state information of corresponding Carrier Aggregation (CA) and Coordinated Multipoint Transmission (CoMP) according to the downlink control information and the feedback sets corresponding to the downlink control information;

wherein the preconfigured feedback sets corresponding to the downlink control information are classified according to configured channel state information;

wherein the preconfigured feedback sets corresponding to the downlink control information are indicated via RRC signaling, the RRC signaling comprising a carrier indication bit for indicating configured carriers, and a channel state information indication bit for indicating configured channel state information corresponding to each configured carrier; and

wherein the number of the feedback sets corresponding to the 2-bit downlink control information is 3 or 2.

12. An eNB, configured to trigger a User Equipment (UE) to aperiodically feed back channel state information, the eNB comprising:

a transmitter configured to transmit to the UE, 2-bit downlink control information and feedback sets corresponding to the downlink control information preconfigured via Radio Resource Control (RRC) signaling, so that the UE aperiodically feeds back channel state information of corresponding Carrier Aggregation (CA) and Coordinated Multipoint Transmission (CoMP) according to the downlink control information and the feedback sets corresponding to the downlink control information;

wherein the preconfigured feedback sets corresponding to the downlink control information are classified according to configured channel state information;

wherein the preconfigured feedback sets corresponding to the downlink control information are indicated via RRC signaling, the RRC signaling comprising a carrier indication bit for indicating triggered aperiodically fed back carriers, and a carrier indication bit for indicating a carrier corresponding to each piece of configured channel state information; and

wherein the number of the feedback sets corresponding to the 2-bit downlink control information is 3 or 2.

13. A User Equipment (UE), comprising:

a receiver configured to receive 2-bit downlink control information and feedback sets corresponding to the downlink control information preconfigured via Radio Resource Control (RRC) signaling transmitted by an eNB; and

a transmitter configured to feed back aperiodically channel state information of corresponding Carrier Aggregation (CA) and Coordinated Multipoint Transmission (CoMP) according to the downlink control information and the feedback sets corresponding to the downlink control information;

wherein the preconfigured feedback sets corresponding to the downlink control information are classified according to configured channel state information;

wherein the preconfigured feedback sets corresponding to the downlink control information are indicated via RRC signaling, the RRC signaling comprising a carrier indication bit for indicating triggered aperiodically fed back carriers, and a carrier indication bit for indicating configured channel state information; and

wherein the number of the feedback sets corresponding to the 2-bit downlink control information is 3 or 2.

14. An eNB, configured to trigger a User Equipment (UE) to aperiodically feed back channel state information, the eNB comprising:

a transmitter configured to transmit to the UE, 2-bit downlink control information and feedback sets corresponding to the downlink control information preconfigured via Radio Resource Control (RRC) signaling, so that the UE aperiodically feeds back channel state information of corresponding Carrier Aggregation (CA) and Coordinated Multipoint Transmission (CoMP) according to the downlink control information and the feedback sets corresponding to the downlink control information;

wherein the preconfigured feedback sets corresponding to the downlink control information are classified according to configured channel state information;

wherein the preconfigured feedback sets corresponding to the downlink control information are indicated via RRC signaling, the RRC signaling comprising a carrier indication bit for indicating triggered carriers, and a channel state information indication bit for indicating fed back contents corresponding to all triggered carriers; and

wherein the number of the feedback sets corresponding to the 2-bit downlink control information is 3 or 2.

15. A User Equipment (UE), comprising:

a receiver configured to receive 2-bit downlink control information and feedback sets corresponding to the downlink control information preconfigured via Radio Resource Control (RRC) signaling transmitted by an eNB; and

a transmitter configured to feed back aperiodically channel state information of corresponding Carrier Aggregation (CA) and Coordinated Multipoint Transmission (CoMP) according to the downlink control information and the feedback sets corresponding to the downlink control information;

wherein the preconfigured feedback sets corresponding to the downlink control information are classified according to configured channel state information;

wherein the preconfigured feedback sets corresponding to the downlink control information are indicated via RRC signaling, the RRC signaling comprising a carrier indication bit for indicating triggered carriers, and a channel state information indication bit for indicating fed back contents corresponding to all triggered carriers; and

wherein the number of the feedback sets corresponding to the 2-bit downlink control information is 3 or 2.

16. An eNB, configured to trigger a User Equipment (UE) to aperiodically feed back channel state information, the eNB comprising:

a transmitter configured to transmit 1-bit downlink control information to the UE, so that the UE aperiodically feeds back corresponding channel state information according to the downlink control information and preconfigured feedback committed information corresponding to the downlink control information;

wherein the preconfigured feedback committed information corresponding to the downlink control information is feeding back first channel state information in an aperiodic feedback channel state information set.

17. A User Equipment (UE), comprising:

a receiver configured to receive 1-bit downlink control information transmitted by an eNB; and

a transmitter configured to feed back aperiodically corresponding channel state information according to the downlink control information and preconfigured feedback committed information corresponding to the downlink control information;

wherein the preconfigured feedback committed information corresponding to the downlink control information is feeding back first channel state information in an aperiodic feedback channel state information set.

18. An eNB, configured to trigger a User Equipment (UE) to aperiodically feed back channel state information, the eNB comprising:

a transmitter configured to transmit to the UE, 1-bit downlink control information and an anchor channel state information resource preconfigured via Radio Resource Control (RRC) signaling, so that the UE aperiodically feeds back corresponding channel state information according to the downlink control information and the anchor channel state information;

wherein the preconfigured anchor channel state information resource is at least one channel state information resource in an aperiodic feedback channel state information set; and

wherein the preconfigured anchor channel state information resource is indicated via RRC signaling, the RRC signaling comprising log 2 (N) bits, N bits, log 2 (M) bits, or M bits, for indicating the anchor channel state information resource; where N is the size of a Coordinated Multipoint Transmission (CoMP) measurement set, and M is the size of a channel state information set configured by the eNB for aperiodic feedback; wherein when the RRC signaling indicates the anchor channel state information resource via N bits or M bits, the indication is performed in a manner of a bitmap.

19. A User Equipment (UE), comprising:

a receiver configured to receive 1-bit downlink control information and an anchor channel state Information resource preconfigured via high-layer signaling transmitted by an eNB; and

a transmitter configured to feed back aperiodically corresponding channel state information according to the downlink control information and the anchor channel state information resource;

wherein the preconfigured anchor channel state information resource is at least one channel state information resource in an aperiodic feedback channel state information set;

and wherein the preconfigured anchor channel state information resource is indicated via Radio Resource Control (RRC) signaling, the RRC signaling comprising log 2 (N) bits, N bits, log 2 (M) bits, or M bits, for indicating the anchor channel state information resource; where N is the size of a Coordinated Multipoint Transmission (CoMP) measurement set, and M is the size of a channel state information set configured by the eNB for aperiodic feedback; wherein when the RRC signaling indicates the anchor channel state information resource via N bits or M bits, the indication is performed in a manner of a bitmap.