Method for instructing CSI feedback signaling configuration and base station

• US 9,749,991 B2
• Filed: 04/26/2013
• Issued: 08/29/2017
• Est. Priority Date: 05/10/2012
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Guo, Senbao, Li, Yu Ngok, Zhang, Junfeng
• Primary Examiner(s): Mian, Omer S
• Application Number:
  US14/400,029
• Publication Number:
  US 20150098347A1
• Time in Patent Office: 1,586 Days
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A method for instructing CSI feedback signaling configuration and base station are provided, the method comprising: a base station side notifies a terminal side, via the first higher layer signaling of a UE-Specific, a CSI-RS resource for measuring CSI, the CSI-RS resource comprising at least one of: the time frequency position of the CSI-RS resource in a subframe, the aerial port number configuration of the CSI-RS resource, a period and a subframe offset of the CSI-RS resource, the sequence identifier of the CSI-RS resource, and the power control information of the CSI-RS resource; the base station side instructs the terminal side to feed back the CSI corresponding to the CSI-RS resource. In the present invention, the base station side flexibly configures the terminal side to feed back various kinds of CSI information, thus enabling the base station side to flexibly and dynamically acquire the CSI, and in turn realizing precise link self-adaption and data transmission, and reducing the uplink feedback overhead and measurement complexity of the terminal side.

Claims

1. A method for instructing channel state information (CSI) feedback signaling configuration, comprising:

a base station notifying a terminal, via the first higher layer signaling of a UE-Specific search space, a plurality of CSI reference signal (CSI-RS) resources for measuring CSI, wherein the higher layer is a layer higher than physical layer in an open system interconnection (OSI) layer model and wherein the CSI-RS resources comprises at least one of;

corresponding time frequency positions of the CSI-RS resources in a respective subframe, aerial port number configuration of the CSI-RS resources, a period and a subframe offset of the CSI-RS resources, a sequence identifier of the CSI-RS resources, and power control information of the CSI-RS resources; and

the base station instructing the terminal to feed back the CSI corresponding to the CSI-RS resources;

wherein the step of the base station instructing the terminal to feed back the CSI corresponding to the CSI-RS resources comprises;

the base station dynamically instructing, through a physical layer dynamic signaling, the terminal to select and feedback corresponding CSI via feedback triggering signaling bits in DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling, and via a resource position where DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling which belongs to the terminal and is blindly detected by the terminal side is located;

wherein the feedback triggering signaling bits in DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling are 2 bits or 1 bit, in the case of 2 bits, where 00 represents no CSI of any CSI-RS resource is triggered, and 01-11 respectively represent triggering CSI of two different aggregation modes of the CSI-RS resources and interference assumptions of the CSI-RS resources;

wherein the resource position where DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling is located comprises at least one of;

(i) a first combination and a second combination of a starting position of a corresponding CCE, a corresponding aggregation level, and a corresponding offset CCE number of the resource position with respect to an initial blind detection position, wherein each of the first combination and second combination indicates a respective different one of the two different aggregation modes and interference assumptions of the CSI-RS resources, and (ii) a corresponding system frame number, wherein the system frame number being odd indicates a different one of two different aggregation modes and interference assumptions than the system frame number being even;

wherein before the step of the base station instructing the terminal side to feed back the CSI corresponding to the CSI-RS resource, the method further comprising;

the base station notifying the terminal, via a second higher layer signaling of the UE-Specific search space, a candidate configuration set of CSI needing to be fed back in the multiple CSI-RS resources, wherein the candidate configuration set indicates at least two sets of CSI-RS resources for measuring CSI.

2. The method according to claim 1, wherein the step of the base station notifying the terminal, via the second higher layer signaling of the UE-Specific search space, a candidate configuration set of CSI needing to be fed back in the multiple CSI-RS resources comprises:

the base station using a bitmap to notify the terminal the candidate configuration set, wherein the length of the bitmap is 3 or 4 or 7 or 8, and each bit in the bitmap corresponds to a different aggregation and interference assumption measurement feedback mode of CSI-RS resources configured.

3. The method according to claim 1, wherein the number of the CSI-RS resources is 2 or 3.

4. The method according to claim 1, wherein when the number of the CSI-RS resources is 2 or 3, the feedback triggering signaling bit of DCI Format 0 or DCI format 4 or the random access response or uplink scheduling grant signaling is 1 bit, and the terminal is instructed;

via the resource position where DCI Format 0 or DCI format 4 or the random access response or uplink scheduling grant signaling is located and the feedback triggering signaling 1 bit, to feed back CSI of different aggregation modes and interference assumptions of the CSI-RS resources.

5. The method according to claim 1, wherein when the number of the CSI-RS resources is 2 or 3, the base station notifies the terminal, via the second higher layer signaling of the UE-Specific search space, N pieces of candidate CSI of different aggregation modes and/or interference assumptions of the CSI-RS resources, where N>

0.

6. A base station, comprising a hardware processor and a memory, and the hardware processor is configured to execute the programming modules stored in the memory, wherein the programming modules comprise:

a first notification module, configured to notify a terminal, via the first higher layer signaling of a UE-Specific search space, a plurality of CSI reference signal (CSI-RS) resource for measuring channel state information (CSI), the higher layer is a layer higher than physical layer in an open system interconnection (OSI) layer model and the CSI-RS resources comprising at least one of;

corresponding time frequency positions of the CSI-RS resources in a respective subframe, aerial port number configuration of the CSI-RS resources, a period and a subframe offset of the CSI-RS resources, a sequence identifier of the CSI-RS resource, and power control information of the CSI-RS resources;

an instruction module, configured to instruct the terminal to feed back the CSI corresponding to the CSI-RS resources; and

wherein instructing comprises using a dynamic instruction sub-module, configured to dynamically instruct, through a physical layer dynamic signaling, the terminal to select and feedback corresponding CSI, via feedback triggering signaling bits in DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling, and via a resource position where DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling which belongs to the terminal and is blindly detected by the terminal is located;

a second notification module, configured to notify, before the instructing, the terminal side, via a second higher layer signaling of the UE-Specific search space, a candidate configuration set of CSI needing to be fed back in the multiple CSI-RS resources, wherein the candidate configuration set indicates at least two sets of CSI-RS resources for measuring CSI;

wherein the feedback triggering signaling bits in DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling are 2 bits, where 00 represents no CSI of any CSI-RS resources is triggered, and 01-11 respectively represent CSI of two different aggregation modes and interference assumptions of the CSI-RS resource are triggered;

the resource position where DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling is located comprises at least one of;

(i) a first combination and a second combination of a starting position of a corresponding CCE, a corresponding aggregation level, and a corresponding offset CCE number of the resource position with respect to an initial blind detection position, wherein each of the first combination and second combination indicates a respective different one of the two different aggregation modes and interference assumptions of the CSI-RS resources, and (ii) a corresponding system frame number, wherein the system frame number being odd indicates a different one of two different aggregation modes and interference assumptions than the system frame number being even.

7. The base station according to claim 6, wherein the second notification module comprises;

a candidate notification sub-module, configured to notify the terminal side the candidate configuration set via a bitmap, wherein the length of the bitmap is 3 or 4 or 7 or 8, and each bit in the bitmap corresponds to a different aggregation and interference assumption measurement feedback mode of CSI-RS resources configured.

8. A terminal, comprising a hardware processor and a memory, and the hardware processor is configured to execute the programming modules stored in the memory, wherein the programming modules comprise:

a first receiving module, configured to receive a plurality of CSI reference signal (CSI-RS) resources for measuring channel state information (CSI) from a base station via a first higher layer signaling of a UE-Specific search space, the higher layer is a layer higher than physical layer in an open system interconnection (OSI) layer model and the CSI-RS resources comprising at least one of;

a corresponding time frequency positions of the CSI-RS resources in a respective subframe, aerial port number configuration of the CSI-RS resources, a period and a subframe offset of the CSI-RS resources, a sequence identifier of the CSI-RS resource, and power control information of the CSI-RS resources;

a selection module, configured to select and feedback CSI corresponding to the CSI-RS resources according to the received first higher layer signaling;

a dynamic receiving sub-module, configured to receive instructions, through a physical layer dynamic signaling, to select and feedback corresponding CSI via feedback triggering signaling bits in DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling, and via a resource position where DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling which belongs to the terminal and is blindly detected by the terminal side is located; and

a second receiving module, configured to receive, before receiving the instructions, a candidate configuration set of CSI needing to be fed back in the multiple CSI-RS resources from the base station via a second higher layer signaling of the UE-Specific search space, wherein the candidate configuration set indicates at least two sets of CSI-RS resources for measuring CSI;

wherein the feedback triggering signaling bits in DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling are 2 bits, where 00 represents no CSI of any CSI-RS resources is triggered, and 01-11 respectively represent CSI of two different aggregation modes and interference assumptions of the CSI-RS resource are triggered;

wherein the resource position where DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling is located comprises at least one of;

(i) a first combination and a second combination of a starting position of a corresponding CCE, a corresponding aggregation level, and a corresponding offset CCE number of the resource position with respect to an initial blind detection position, wherein each of the first combination and second combination indicates a respective different one of the two different aggregation modes and interference assumptions of the CSI-RS resources, and (ii) a corresponding system frame number, wherein the system frame number being odd indicates a different one of two different aggregation modes and interference assumptions than the system frame number being even.

9. The base station according to claim 8, wherein the second receiving module comprises:

a candidate receiving sub-module, configured to obtain the candidate configuration set of the terminal side by receiving a bitmap, wherein the length of the bitmap is 3 or 4 or 7 or 8, and each bit in the bitmap corresponds to a different aggregation and interference assumption measurement feedback mode of CSI-RS resources configured.