Method for instructing CSI feedback signaling configuration and base station

Patent metadata

Field	Value
Publication number	US-9749991-B2
Application number	US-201314400029-A
Country	US
Kind code	B2
Filing date	Apr 26, 2013
Priority date	May 10, 2012
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

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.

First claim

What is claimed is:

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 assu

Assignees

• Guo Senbao
• Li Yu Ngok
• Zhang Junfeng
• Zte Corp

Inventors

• Guo Senbao
• Li Yu Ngok
• Zhang Junfeng

Classifications

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W52/243

  taking into account interferences · CPC title

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04B7/0626 Primary

  Channel coefficients, e.g. channel state information [CSI] · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title