Method and apparatus for triggering aperiodic feedback in coordinated multipoint transmission

Patent metadata

Field	Value
Publication number	US-2016174201-A1
Application number	US-201614995779-A
Country	US
Kind code	A1
Filing date	Jan 14, 2016
Priority date	Jun 18, 2012
Publication date	Jun 16, 2016
Grant date	—

Abstract

Embodiments of the present invention provide a method and apparatus for triggering aperiodic feedback in coordinated multipoint transmission. The method includes: transmitting, by an eNB to UE, dynamic control information (DCI) and preconfigured feedback sets corresponding to the DCI, so that the UE aperiodically feeds back corresponding channel state information (CSI) according to the DCI and the feedback sets corresponding to the DCI; wherein the preconfigured feedback sets corresponding to the DCI are classified according to a triggered transmitting point or a CSI-RS of non-zero power, or are classified according to configured CSI, or are classified according to an interference type. With the method and apparatus of the embodiments of the present invention, a relatively good tradeoff between flexibility of aperiodic CSI feedback and signaling load in a CoMP transmission process or a joint transmission process of CoMP and CA may be achieved.

First claim

What is claimed is:

1 . An eNB, configured to trigger a User Equipment (UE) to aperiodically feed back Channel State Indication (CSI), the eNB comprising:
a transmitter configured to transmit to the UE which is configured in Coordinated Multipoint Transmission (CoMP) mode, 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 CSI 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 CSI,
wherein 1 bit information or 2 bit information is used in a CSI request field in the downlink control information for uplink transmission;
when the CSI request field is 1 bit information, the feedback sets is one feedback set corresponding to a value of the CSI request field 1; and
when the CSI request field is 2 bit information, the feedback sets are three feedback sets corresponding respectively to values of the CSI request field01, 10 and 11, or the feedback sets are two feedback sets corresponding respectively to the values of the CSI request field 10 and 11.

2 . The eNB according to claim 1 , wherein each of the feedback sets is configured to indicate a CSI 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 CSI set configured by the eNB for aperiodic feedback.

3 . A User Equipment (UE), comprising:
a receiver configured to receive 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 Indication (CSI) 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 CSI
wherein 1 bit information or 2 bit information is used in a CSI request field in the downlink control information for uplink transmission;
when the CSI request field is 1 bit information, the feedback sets is one feedback set corresponding to a value of the CSI request field 1; and
when the CSI request field is 2 bit information, the feedback sets are three feedback sets corresponding respectively to values of the CSI request field 01, 10 and 11, or the feedback sets are two feedback sets corresponding respectively to the values of the CSI request field 10 and 11.

4 . The UE according to claim 3 , wherein each of the feedback sets is configured to indicate a CSI 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 CSI set configured by the eNB for aperiodic feedback.

5 . An eNB, configured to trigger a User Equipment (UE) to aperiodically feed back Channel State Indication (CSI), the eNB comprising:
a transmitter configured to transmit to the UE, downlink control information and feedback sets corresponding to the downlink control information configured via Radio Resource Control (RRC) signaling, so that the UE aperiodically feeds back CSI 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 feedback sets corresponding to the downlink control information configured via RRC signaling are classified according to configured CSI,
wherein the 1 bit information or 2 bit information is used in a CSI request field in the downlink control information for uplink transmission;
when the CSI request field is 1 bit information, the feedback sets is one feedback set corresponding to a value of the CSI request field 1; and
when the CSI request field is 2 bit information, the feedback sets are three feedback sets corresponding respectively to values of the CSI request field 01, 10 and 11, or the feedback sets are two feedback sets corresponding respectively to the values of the CSI request field 10 and 11.

6 . The eNB according to claim 5 , wherein each of the feedback sets is configured to indicate a CSI 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 CSI set configured by the eNB for aperiodic feedback.

7 . The eNB according to claim 5 , wherein the configured 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 CSI.

8 . The eNB according to claim 5 , wherein the configured 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 CSI indication bit for indicating configured CSI corresponding to each configured carrier.

9 . A User Equipment (UE), comprising:
a receiver configured to receive downlink control information and feedback sets corresponding to the downlink control information configured via Radio Resource Control (RRC) signaling transmitted by an eNB; and a transmitter configured to feed back aperiodically Channel State Indication (CSI) of corresponding Carrier Aggregation (CA) and Coordinated Multipoint Transmission (CoMP) according to the downlink control information and the feedback sets corresponding to the DCI; wherein the configured feedback sets corresponding to the DCI are classified according to configured CSI, wherein 1 bit information or 2 bit information is used in a CSI request field in the downlink control information for uplink transmission; when the CSI request field is 1 bit information, the feedback sets is one feedback set corresponding to a value of CSI request field 1; and when the CSI request field is 2 bit information, the feedback sets are three feedback sets corresponding respectively to values of CSI request field 01, 10 and 11, or the feedback sets are two feedback sets corresponding respectively to the values of CSI request field 10 and 11.

10 . The UE according to claim 9 , wherein the receiver is configured to receive 2-bit DCI;
wherein the RRC signaling comprising a carrier indication bit corresponding to each piece of configured CSI; and wherein the number of the feedback sets corresponding to the 2-bit CSI request field is 3 or 2.

11 . The UE according to claim 9 , wherein the receiver is configured to receive 2-bit CSI request field; and
wherein the configured 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 CSI indication bit for indicating configured CSI corresponding to each configured carrier; and wherein the number of the feedback sets corresponding to the 2-bit CSI request field is 3 or 2.

12 . The UE according to claim 9 , wherein each of the feedback sets is configured to indicate a CSI 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 CSI set configured by the eNB for aperiodic feedback.

Assignees

• Fujitsu Ltd

Inventors

• Zhang Yi
• Wang Yi
• Zhang Jian
• Zhou Hua
• Wu Jianming

Classifications

• H04L1/0026

  Transmission of channel quality indication · CPC title

• H04L1/0027

  Scheduling of signalling, e.g. occurrence thereof · CPC title

• H04B7/0647

  Variable feedback rate · CPC title

• H04L5/0035

  Resource allocation in a cooperative multipoint environment · CPC title

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title