WO2015003367A1

WO2015003367A1 - Method for feeding back channel state information (csi), user equipment, and base station

Info

Publication number: WO2015003367A1
Application number: PCT/CN2013/079228
Authority: WO
Inventors: 高驰; 刘建琴; 刘鹍鹏; 吴强
Original assignee: 华为技术有限公司
Priority date: 2013-07-11
Filing date: 2013-07-11
Publication date: 2015-01-15
Also published as: CN105165083A

Abstract

Disclosed are a method for feeding back CSI, a user equipment, and a base station. The method comprises: determining a CSI set, the CSI set comprising first CSI and second CSI, a resource granularity of the first CSI being a physical resource block (PRB) pair occupied by an enhanced physical downlink control channel (EPDCCH), and the resource granularity of the first CSI being different from that of the second CSI; and sending the CSI set to a base station. According to the method for feeding back CSI, the user equipment and the base station in the embodiments of the present invention, the user equipment feeds back CSI of an EPDCCH to the base station, so that the base station can optimize the EPDCCH according to the CSI of the EPDCCH, thereby improving a channel state of the EPDCCH, improving cell coverage, saving a time-frequency resource of a system, and improving the whole performance of the system.

Description

Method for feeding back channel state information CSI, user equipment and base station

Embodiments of the present invention relate to the field of communications, and more particularly, to a method, a user equipment, and a base station for feeding back channel state information CSI. Background technique

In wireless communication systems, link adaptation technology and Multiple-input and Multiple-output (MIMO) technology can significantly improve the data throughput of the system. In the link adaptation technology, the transmitting end dynamically adjusts the modulation mode and the coding rate according to the channel quality indicator (CQI) fed back by the receiving end, so that the system increases the data transmission under the premise of satisfying certain detection performance. rate. The MIMO system uses multiple antennas at both ends of the transceiver, and transmits multiple independent data streams through spatial multiplexing technology to increase the data transmission rate. The number of independent data streams is called rank. In addition, the Long Term Evolution (LTE) system defines a transmission mode based on closed-loop spatial multiplexing to improve the performance of the system. The closed-loop spatial multiplexing uses a codebook-based precoding technique, that is, a pre-designed one. A codebook containing all possible precoding matrices may be indicated by an index of the codebook, which is referred to as a Precoding Matrix Indicator ("PMI").

In the future evolution of the LTE system, in order to further improve the system performance, some resources are allocated on the traditional data transmission resource for transmitting control signaling, and the newly allocated part of the resource is called an enhanced physical downlink control channel (Enhanced Physical Downlink). Control Channel, referred to as "EPDCCH". Compared with the traditional Physical Downlink Control Channel ("PDCCH"), the EPDCCH can adopt a precoding technology based on Demodulation Reference Signals (DMRS). The resource allocation mode of the EPDCCH is that the base station allocates one or two EPDCCH resource sets for each user equipment, and each EPDCCH resource set includes a plurality of resource blocks ("PRB").

The user equipment (User Equipment, referred to as "UE") may estimate the downlink MIMO channel based on the downlink reference signal, and determine an optimal rank, precoding matrix, and channel quality information based on the channel estimation, and the user equipment may also respectively correspond to the downlink MIMO channel. Rank indicator (Rank lndicator, abbreviation Feedback to the base station for "RT", PMI, and CQI, the feedback of the RI, PMI, and CQI is collectively referred to as CSI feedback. The specific feedback content of the UE depends on the transmission mode, for example, the PMI only needs feedback in the closed-loop transmission mode, and the UE is When the CQI is fed back, the feedback PMI may be required at the same time, which is recorded as CQI/PML. However, the CSI feedback in the prior art is optimized for the Physical Downlink Shared Channel (PDSCH), and there is no optimization for the EPDCCH transmission. The CSI feedback makes the EPDCCH transmission unable to reach a better state. The UE farther from the base station may not be able to receive the control signaling sent by the base station, thereby affecting the cell coverage and system performance, and in addition, the channel state is better. Compared with the EPDCCH, the EPDCCH with a poor channel state needs to occupy more time-frequency resources when transmitting the same signaling, thereby causing waste of system resources.

The embodiments of the present invention provide a method for feeding back CSI, a user equipment, and a base station, which can improve the channel state of the EPDCCH.

In a first aspect, a method for feeding back CSI is provided, including: determining a CSI set, where the CSI set includes a first CSI and a second CSI, where a resource granularity of the first CSI is a physical resource occupied by an enhanced physical downlink control channel EPDCCH. a block PRB pair, and the resource sizes of the first CSI and the second CSI are different; the CSI set is sent to the base station.

With reference to the first aspect, in a first possible implementation, the resource granularity of the second CSI is a system bandwidth, where the first CSI includes a CSI obtained based on a PRB pair occupied by the EPDCCH; or a resource granularity of the second CSI. For system wideband, the first CSI is a difference between the determined CSI and the second CSI based on the PRB pair occupied by the EPDCCH.

With reference to the first aspect, in a second possible implementation manner, the resource granularity of the second CSI is a system subband.

With reference to the second possible implementation of the first aspect, in a third possible implementation, the first CSI includes a CSI obtained based on a first PRB pair occupied by the EPDCCH, where the second CSI includes A PRB determines the CSI for a system subband outside the subband.

With reference to the second possible implementation of the first aspect, in a fourth possible implementation, the first CSI is determined based on the first PRB pair occupied by the EPDCCH and is based on the first

The difference between the PRB and the CSI determined by the subband.

In a second aspect, a method for feeding back CSI is provided, including: receiving a CSI set sent by a user equipment UE, where the CSI set includes a first CSI and a second CSI, and the resource granularity of the first CSI The physical resource block PRB pair occupied by the enhanced physical downlink control channel EPDCCH, and the resource granularity of the first CSI and the second CSI are different; according to the CSI set, the channel state of the downlink channel between the base station and the UE is determined.

With reference to the second aspect, in a first possible implementation, the resource granularity of the second CSI is a system bandwidth, where the first CSI includes a CSI obtained based on a PRB pair occupied by the EPDCCH; or a resource granularity of the second CSI. For system wideband, the first CSI is a difference between the determined CSI and the second CSI based on the PRB pair occupied by the EPDCCH.

With reference to the second aspect, in a second possible implementation, the resource granularity of the second CSI is a system subband.

With reference to the second possible implementation manner of the second aspect, in a third possible implementation manner, the first CSI includes a CSI obtained based on a first PRB pair occupied by the EPDCCH, where the second CSI includes A PRB determines the CSI for a system subband outside the subband.

With reference to the second possible implementation manner of the second aspect, in a fourth possible implementation manner, the first CSI is determined by using a first PRB pair occupied by the EPDCCH and a subband based on the first PRB pair Determine the difference in CSI.

In a third aspect, a user equipment (UE) is provided, including: a determining module, configured to determine a CSI set, where the CSI set includes a first CSI and a second CSI, where a resource granularity of the first CSI is an enhanced physical downlink control channel (EPDCCH) And the resource module of the first CSI and the second CSI are different in granularity; the sending module is configured to send the CSI set determined by the determining module to the base station.

With reference to the third aspect, in a first possible implementation, the resource granularity of the second CSI is a system bandwidth, where the first CSI includes a CSI obtained based on a PRB pair occupied by the EPDCCH; or a resource granularity of the second CSI. For system wideband, the first CSI is a difference between the determined CSI and the second CSI based on the PRB pair occupied by the EPDCCH.

With reference to the third aspect, in a second possible implementation manner, the resource granularity of the second CSI is a system subband.

With reference to the second possible implementation manner of the third aspect, in a third possible implementation manner, the first CSI includes a CSI obtained based on a first PRB pair occupied by the EPDCCH, where the second CSI includes A PRB determines the CSI for a system subband outside the subband.

With reference to the second possible implementation manner of the third aspect, in a fourth possible implementation manner, the first CSI is determined based on the first PRB pair occupied by the EPDCCH, and is based on the first The difference in the CSI determined by the PRB for the subband.

In a fourth aspect, a base station is provided, including: a receiving module, configured to receive a CSI set sent by a user equipment UE, where the CSI set includes a first CSI and a second CSI, where a resource granularity of the first CSI is an enhanced physical downlink The control resource EPDCCH occupies a physical resource block PRB pair, and the first CSI and the second CSI have different resource granularities; and the determining module is configured to determine, according to the CSI set received by the receiving module, a downlink between the base station and the UE The channel state of the channel.

With reference to the fourth aspect, in a first possible implementation, the resource granularity of the second CSI is a system bandwidth, where the first CSI includes a CSI obtained based on a PRB pair occupied by the EPDCCH; or a resource granularity of the second CSI. For system wideband, the first CSI is a difference between the determined CSI and the second CSI based on the PRB pair occupied by the EPDCCH.

With reference to the fourth aspect, in a second possible implementation, the resource granularity of the second CSI is a system subband.

With reference to the second possible implementation manner of the fourth aspect, in a third possible implementation, the first CSI includes a CSI obtained based on a first PRB pair occupied by the EPDCCH, where the second CSI includes A PRB determines the CSI for a system subband outside the subband.

With reference to the second possible implementation manner of the fourth aspect, in a fourth possible implementation manner, the first CSI is a CSI determined based on a first PRB pair occupied by the EPDCCH and a subband based on the first PRB pair Determine the difference in CSI.

Based on the foregoing technical solution, the method for feeding back CSI, the user equipment, and the base station according to the embodiment of the present invention, the user equipment feeds back the CSI of the EPDCCH to the base station, so that the base station can optimize the EPDCCH according to the CSI of the EPDCCH, thereby improving the EPDCCH. The channel state enhances the coverage of the cell and saves the system's time-frequency resources, improving the overall performance of the system. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention or the description of the prior art will be briefly described below. Obviously, the drawings described below are only the present invention. For some embodiments, other drawings may be obtained from those of ordinary skill in the art without departing from the drawings.

FIG. 1 is a schematic flowchart of a method for feeding back channel state information CSI according to an embodiment of the present invention. FIG. 2 is a schematic flowchart of a method for feeding back CSI according to another embodiment of the present invention.

FIG. 3 is a schematic block diagram of a user equipment UE according to an embodiment of the present invention. 4 is a schematic block diagram of a base station according to an embodiment of the present invention.

FIG. 5 is a schematic block diagram of a user equipment UE according to another embodiment of the present invention.

FIG. 6 is a schematic block diagram of a base station according to another embodiment of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without making creative labor are within the scope of the present invention.

It should be understood that the technical solutions of the embodiments of the present invention can be applied to various communication systems, such as: Global System of Mobile communication ("GSM") system, Code Division Multiple Access (Code Division Multiple Access, referred to as "CDMA") system, Wideband Code Division Multiple Access ("WCDMA") system, General Packet Radio Service ("GPRS"), Long Term Evolution (Long Term Evolution, Referred to as "LTE" system, LTE frequency division duplex ("FDD") system, LTE time division duplex ("TDD"), universal mobile communication system (Universal Mobile Telecommunication) System, referred to as "UMTS", and Worldwide Interoperability for Microwave Access (WiMAX) communication systems.

It should also be understood that in the embodiment of the present invention, a user equipment (User Equipment, referred to as "UE") may be referred to as a terminal (Mobile), a mobile station (Mobile Station, referred to as "MS"), and a mobile terminal (Mobile Terminal). The user equipment can communicate with one or more core networks via a Radio Access Network (RAN), for example, the user equipment can be a mobile telephone (or "cellular" telephone). Computers with mobile terminals, etc., for example, the user devices can also be portable, pocket-sized, handheld, computer-integrated or in-vehicle mobile devices that exchange voice and/or data with the wireless access network.

It should also be understood that, in the embodiment of the present invention, the base station may be a base station (Base Transceiver Station, abbreviated as "BTS") in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be in LTE. The evolved base station (evolved Node B, abbreviated as "eNB" or "e-NodeB") is not limited by the present invention.

1 shows an illustration of a method 100 of feeding back channel state information CSI in accordance with an embodiment of the present invention. The intentional flow chart, the method can be performed by the user equipment UE. As shown in FIG. 1, the method 100 includes:

S110. Determine a CSI set, where the CSI set includes a first CSI and a second CSI, where a resource granularity of the first CSI is a physical resource block PRB pair occupied by an enhanced physical downlink control channel EPDCCH, and the first CSI and the second CSI has different resource granularities;

S120. Send the CSI set to a base station.

Therefore, according to the method for feeding back CSI, the user equipment feeds back the CSI of the EPDCCH to the base station, so that the base station can optimize the EPDCCH according to the CSI of the EPDCCH, thereby improving the channel state of the EPDCCH and enhancing the coverage of the cell. The scope and save the system's time-frequency resources, improve the overall performance of the system.

In this embodiment of the present invention, the CSI set includes a first CSI and a second CSI, where a resource granularity of the first CSI is different from a resource granularity of the second CSI. Specifically, the first CSI is determined by performing measurement on the EPDCCH, and the resource granularity thereof is a PRB pair, and the second CSI may be determined by performing measurement on the PDSCH and the resource granularity thereof may be subband or broadband, optionally The CSI set may also include other resource granularity CSI, and the embodiment of the present invention is not limited thereto.

The first CSI may include at least one of the following: RI, PMI, and CQI, and the second CSI may also include at least one of the following: RI, PMI, and CQI, but the embodiment of the present invention is not limited thereto.

In the embodiment of the present invention, the UE feeds back the CSI for the EPDCCH while feeding back the CSI for the PDSCH, which can save the signaling overhead caused by the CSI feedback and further improve the system performance.

In the embodiment of the present invention, the UE may periodically feed back the CSI to the base station, and may also trigger the CSI to the base station, for example, when the UE receives the indication information sent by the base station to indicate the feedback CSI of the UE. Feedback is made, but embodiments of the invention are not limited thereto.

In addition, the foregoing CSI may be a CSI obtained directly based on a PRB pair occupied by the EPDCCH, or may be a CSI obtained by processing a CSI directly obtained by a PRB pair occupied by the EPDCCH, for example, directly obtained based on the PRB pair. The difference between the CSI and the second CSI, but the embodiment of the present invention is not limited thereto.

Optionally, the EPDCCH may occupy at least one EPDCCH resource set, and each EPDCCH resource set in the at least one EPDCCH resource set may include at least one PRB pair, and accordingly, the first CSI may include only one EPDCCH resource set based The determined CSI of the PRB may also include CSIs respectively determined based on the PRB pairs of the two or more EPDCCH resource sets, that is, at least one EPDCCH resource set that the UE may occupy for the EPDCCH. And performing feedback, wherein, when the UE feeds back the first EPDCCH resource set occupied by the EPDCCH, the first CSI may include CSI respectively determined according to all PRB pairs in the first EPDCCH resource set, for example, the An EPDCCH resource set includes N PRB pairs, where N is an integer greater than 0, the first CSI may include N CSI values, and each CSI value is determined based on one of the N PRB pairs, respectively. The embodiment of the invention is not limited thereto.

Correspondingly, the first CSI is used to feed back at least one EPDCCH resource set occupied by the EPDCCH, but the embodiment of the present invention is not limited thereto.

Optionally, the resource granularity of the second CSI may be a system bandwidth, and the first CSI may be directly obtained based on the PRB pair occupied by the EPDCCH, or may be a CSI directly obtained based on the PRB pair occupied by the EPDCCH. The difference of the second CSI, the embodiment of the present invention is not limited thereto.

Correspondingly, the resource granularity of the second CSI is a system bandwidth, and the first CSI includes a CSI obtained based on a PRB pair occupied by the EPDCCH; or

The resource granularity of the second CSI is a system bandwidth, and the first CSI is a difference between the determined CSI and the second CSI based on the PRB pair occupied by the EPDCCH.

In this embodiment of the present invention, the UE may obtain the first CSI in multiple manners. Optionally, the first CSI may be a CSI obtained based on the PRB pair occupied by the EPDCCH and a sequence number of the CSI obtained based on the system broadband. The difference may also be a difference between the CSI obtained by the PRB pair occupied by the EPDCCH and the absolute value of the CSI obtained based on the system wideband, for example, the absolute value of the CQI, but the embodiment of the present invention is not limited thereto.

Optionally, as another embodiment, the resource granularity of the second CSI may be a system subband, where the system subband may include k consecutive PRBs, where k is an integer greater than 0, and accordingly, The resource granularity of the second CSI is a system subband.

Optionally, the second CSI may include CSI obtained separately according to each subband of the system, or may only include CSI obtained based on a partial subband of the system, and the embodiment of the present invention is not limited thereto.

Optionally, when the resource granularity of the second CSI is a system subband, the first CSI may include a CSI directly obtained based on a PRB pair occupied by the EPDCCH, and may also include a CSI directly obtained based on the PRB pair occupied by the EPDCCH. The difference of the second CSI, the embodiment of the present invention is not limited thereto.

Correspondingly, the first CSI includes a CSI obtained based on a first PRB pair occupied by the EPDCCH, and the second CSI includes a CSI determined based on a system subband other than the subband in which the first PRB pair is located. Wherein, when the first CSI includes the CSI obtained based on the first PRB pair, the second CSI does not include the CSI obtained based on the subband in which the first PRB pair is located, in other words, when the second CSI includes a system based When the first sub-band obtains the CSI, the first CSI does not include the CSI obtained based on the PRB included in the first sub-band, but the embodiment of the present invention is not limited thereto.

Optionally, as another embodiment, the first CSI is based on the first occupied by the EPDCCH.

The difference between the determined CSI of the PRB pair and the CSI determined based on the subband in which the first PRB pair is located.

The sub-band of the first PRB pair refers to a sub-band including the first PRB pair. In addition, the embodiment of the present invention may obtain the second CSI in multiple manners. Optionally, the second CSI may be a CSI obtained by using the first PRB pair and the CSI obtained by the first PRB pair. The difference may also be a difference between the CSI obtained by the first PRB pair and the absolute value of the CSI obtained by the subband in the first PRB pair, for example, the difference between the absolute values of the CQI, but the embodiment of the present invention is not limited thereto. this.

The method for feeding back CSI according to an embodiment of the present invention is described in detail above with reference to FIG. 1. From the perspective of a base station, a method for feeding back CSI according to an embodiment of the present invention will be described in detail below.

FIG. 2 is a schematic flowchart of a method 200 for feeding back CSI according to another embodiment of the present invention. The method may be performed by any suitable device, for example, by a network element such as a base station, a base station controller, or a network side server. For convenience of description, the following is a description of the method 200 performed by the base station, but the embodiment of the present invention is not limited thereto. As shown in FIG. 2, the method 200 includes:

S210, receiving a CSI set sent by the user equipment UE, where the CSI set includes a first CSI and a second CSI, where the resource granularity of the first CSI is a physical resource block PRB pair occupied by the enhanced physical downlink control channel EPDCCH, and the first The resource granularity of the CSI and the second CSI are different;

S220. Determine, according to the CSI set, a channel state of a downlink channel between the base station and the UE. Therefore, according to the method for feeding back CSI, the user equipment feeds back the CSI of the EPDCCH to the base station, so that the base station can optimize the EPDCCH according to the CSI of the EPDCCH, thereby improving the channel state of the EPDCCH and enhancing the coverage of the cell. The scope and save the system's time-frequency resources, improve the overall performance of the system. Optionally, the resource granularity of the second CSI is a system bandwidth, where the first CSI includes a CSI obtained based on a PRB pair occupied by the EPDCCH; or

Optionally, the resource granularity of the second CSI is a system subband.

Optionally, as another embodiment, the first CSI includes a CSI obtained based on a first PRB pair occupied by the EPDCCH, where the second CSI includes determining a system subband based on a subband other than the first PRB pair. CSI.

Optionally, as another embodiment, the first CSI is a difference between a CSI determined based on a first PRB pair occupied by the EPDCCH and a CSI determined based on a subband in which the first PRB pair is located.

It should be understood that the size of the sequence numbers of the above processes does not imply a sequence of executions, and the order of execution of the processes should be determined by its function and internal logic, and should not be construed as limiting the implementation process of the embodiments of the present invention.

The method of feeding back CSI according to an embodiment of the present invention is described in detail above with reference to FIG. 1 to FIG. 2, and a base station and a user equipment according to an embodiment of the present invention will be described below with reference to FIG. 3 to FIG.

FIG. 3 shows a schematic block diagram of a user equipment UE 300 according to an embodiment of the present invention, as shown in the figure.

As shown in FIG. 3, the UE 300 includes:

The determining module 310 is configured to determine a CSI set, where the CSI set includes a first CSI and a second CSI, where the resource granularity of the first CSI is a physical resource block PRB pair occupied by the enhanced physical downlink control channel EPDCCH, and the first CSI Different from the resource granularity of the second CSI;

The sending module 320 is configured to send, to the base station, the CSI set determined by the determining module 310. Therefore, the user equipment according to the embodiment of the present invention feeds back the CSI of the EPDCCH to the base station by using the user equipment, so that the base station can optimize the EPDCCH according to the CSI of the EPDCCH, thereby improving the channel state of the EPDCCH, and enhancing the coverage of the cell. Save time and frequency resources of the system and improve the overall performance of the system.

Optionally, the resource granularity of the second CSI is a system bandwidth, and the first CSI includes

CSI obtained by the PRB pair occupied by the EPDCCH; or The resource granularity of the second CSI is a system bandwidth, and the first CSI is a difference between the determined CSI and the second CSI based on the PRB pair occupied by the EPDCCH.

Optionally, as another embodiment, the resource granularity of the second CSI is a system subband.

User equipment 300 according to an embodiment of the present invention may correspond to user equipment in a method of indicating a pilot state according to an embodiment of the present invention, and the above and other operations and/or functions of respective modules in user equipment 300 are respectively implemented in order to implement a map. The corresponding flow of each method in 1 will not be repeated here for brevity.

Therefore, the user equipment according to the embodiment of the present invention feeds back to the base station through the user equipment.

The CSI of the EPDCCH enables the base station to optimize the EPDCCH according to the CSI of the EPDCCH, thereby improving the channel state of the EPDCCH, enhancing the coverage of the cell, saving the system time-frequency resources, and improving the overall performance of the system.

FIG. 4 shows a schematic block diagram of a base station 400 according to an embodiment of the present invention. As shown in FIG. 4, the base station 400 includes:

The receiving module 410 is configured to receive a CSI set sent by the user equipment UE, where the CSI set includes a first CSI and a second CSI, where the resource granularity of the first CSI is a physical resource block PRB pair occupied by the enhanced physical downlink control channel EPDCCH, And the resource granularity of the first CSI and the second CSI are different;

The determining module 420 is configured to determine, according to the CSI set received by the receiving module 410, a channel state of a downlink channel between the base station and the UE.

Therefore, the base station according to the embodiment of the present invention feeds back the CSI of the EPDCCH to the base station by using the user equipment, so that the base station can optimize the EPDCCH according to the CSI of the EPDCCH, thereby improving the channel state of the EPDCCH, enhancing the coverage of the cell, and saving The system's time-frequency resources enhance the overall performance of the system.

Optionally, the resource granularity of the second CSI is a system bandwidth, where the first CSI includes a CSI obtained based on a PRB pair occupied by the EPDCCH; or

The resource granularity of the second CSI is a system bandwidth, and the first CSI is based on the EPDCCH. The difference between the determined CSI and the second CSI for the PRB pair used.

The base station 400 according to an embodiment of the present invention may correspond to a user equipment in a method for indicating a pilot state according to an embodiment of the present invention, and the above and other operations and/or functions of respective modules in the base station 400 are respectively implemented in FIG. The corresponding processes of the various methods are not repeated here for brevity.

FIG. 5 shows a schematic block diagram of a user equipment UE 500 according to another embodiment of the present invention. As shown in FIG. 5, the UE 500 includes: a processor 510, a memory 520, a bus system 530, and a transmitter 540. The processor 510, the memory 520 and the transmitter 540 are connected by a bus system 530 for storing instructions. The processor 510 calls the instruction stored in the memory 520 through the bus system 530 for determining CSI. And the CSI set includes a first CSI and a second CSI, where the resource granularity of the first CSI is a physical resource block PRB pair occupied by the enhanced physical downlink control channel EPDCCH, and the resource granularity of the first CSI and the second CSI The transmitter 540 is configured to send the CSI set determined by the processor 510 to the base station.

Therefore, the user equipment according to the embodiment of the present invention feeds back the CSI of the EPDCCH to the base station by using the user equipment, so that the base station can optimize the EPDCCH according to the CSI of the EPDCCH, thereby improving the channel state of the EPDCCH, and enhancing the coverage of the cell. Save time and frequency resources of the system and improve the overall performance of the system.

It should be understood that, in the embodiment of the present invention, the processor 510 may be a central processing unit (Central Processing Unit, abbreviated as "CPU"), and the processor 510 may also be other general-purpose processors, digital signal processors (DSPs). An application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, and the like. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The memory 520 can include read only memory and random access memory and provides instructions and data to the processor 510. A portion of the memory 520 may also include a non-volatile random access memory. For example, the memory 520 can also store information of the device type.

The bus system 530 may include a power bus, a control bus, and a status signal bus in addition to the data bus. However, for clarity of description, various buses are labeled as bus system 530 in the figure.

In an implementation process, the steps of the above method may be completed by an integrated logic circuit of hardware in the processor 510 or an instruction in the form of software. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software modules can be located in random memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, etc., which are well established in the art. The storage medium is located in the memory 520. The processor 510 reads the information in the memory 520 and completes the steps of the above method in combination with the hardware. To avoid repetition, it will not be described in detail here.

The CSI obtained by the PRB pair occupied by the EPDCCH; or

User equipment 500 according to an embodiment of the present invention may correspond to a user equipment in a method of indicating a pilot state according to an embodiment of the present invention, and the above and other operations and/or functions of respective modules in user equipment 500 are respectively implemented for The corresponding flow of each method in 1 will not be repeated here for brevity.

Therefore, the user equipment according to the embodiment of the present invention feeds back the CSI of the EPDCCH to the base station by using the user equipment, so that the base station can optimize the EPDCCH according to the CSI of the EPDCCH, thereby improving the channel state of the EPDCCH, and enhancing the coverage of the cell. Savings department The time-frequency resources of the system improve the overall performance of the system.

FIG. 6 shows a schematic block diagram of a base station 600 according to another embodiment of the present invention. As shown in FIG. 6, the base station 600 includes: a processor 610, a memory 620, a bus system 630, and a receiver 640. The processor 610, the memory 620, and the receiver 640 are connected by a bus system 630. The memory 620 is configured to store an instruction, and the processor 610 calls the instruction stored in the memory 620 through the bus system 630. Specifically, the The receiver 640 is configured to receive a CSI set sent by the user equipment UE, where the CSI set includes a first CSI and a second CSI, where the resource granularity of the first CSI is a physical resource block PRB pair occupied by the enhanced physical downlink control channel EPDCCH, and The resource size of the first CSI and the second CSI are different; the processor 610 is configured to determine, according to the CSI set received by the receiver 640, a channel state of a downlink channel between the base station and the UE.

It should be understood that in the embodiment of the present invention, the processor 610 may be a central processing unit (Central)

Processing Unit (referred to as "CPU"), the processor 610 can also be other general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), off-the-shelf programmable gate arrays (FPGAs), or other programmable logic. Devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

The memory 620 can include read only memory and random access memory and provides instructions and data to the processor 610. A portion of memory 620 may also include non-volatile random access memory. For example, the memory 620 can also store information of the device type.

The bus system 630 may include a power bus, a control bus, and a status signal bus in addition to the data bus. However, for clarity of description, various buses are labeled as bus system 630 in the figure.

In the implementation process, each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 610 or an instruction in a form of software. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software modules can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory 620, and the processor 610 reads the information in the memory 620 and combines the information. The hardware completes the steps of the above method. To avoid repetition, it will not be described in detail here.

The base station 600 according to an embodiment of the present invention may correspond to user equipment in a method for indicating a pilot state according to an embodiment of the present invention, and the above and other operations and/or functions of respective modules in the base station 600 are respectively implemented in FIG. The corresponding processes of the various methods are not repeated here for brevity.

It should be understood that in the embodiments of the present invention, the term "and/or" is merely an association relationship describing an associated object, indicating that there may be three relationships. For example, A and / or B, can mean: A exists separately, there are A and B, and there are three cases of B alone. In addition, the character " /" in this article generally indicates that the contextual object is an "or" relationship.

Those skilled in the art will appreciate that the various method steps and elements described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, in order to clearly illustrate hardware and software. Interchangeability, the steps and composition of the various embodiments have been generally described in terms of function in the foregoing description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. Different methods may be used to implement the described functionality for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

It will be apparent to those skilled in the art that, for convenience and brevity of description, the above For a specific working process of the system, the device, and the unit, refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided herein, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.

The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a USB flash drive, a mobile hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a disk or a CD. A variety of media that can store program code.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any equivalent person can be easily conceived within the technical scope of the present invention. Modifications or substitutions are intended to be included within the scope of the invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Rights request

1. A method of feedback channel state information CSI, characterized by including:

Determine a CSI set, the CSI set includes a first CSI and a second CSI, the resource granularity of the first CSI is a physical resource block PRB pair occupied by the enhanced physical downlink control channel EPDCCH, and the first CSI and the The resource granularity of the second CSI is different;

Send the CSI set to the base station.

2. The method according to claim 1, wherein the resource granularity of the second CSI is system bandwidth, and the first CSI includes CSI obtained based on the PRB pair occupied by the EPDCCH; or

The resource granularity of the second CSI is system bandwidth, and the first CSI is based on the

The difference between the CSI determined by the PRB pair occupied by EPDCCH and the second CSI.

3. The method according to claim 1, characterized in that the resource granularity of the second CSI is a system subband.

4. The method according to claim 3, characterized in that, the first CSI includes CSI obtained based on the first PRB pair occupied by the EPDCCH, and the second CSI includes CSI obtained based on the first PRB pair except where the first PRB pair is located. CSI determined by system subbands outside the subband.

5. The method according to claim 3, characterized in that, the first CSI is the difference between the CSI determined based on the first PRB pair occupied by the EPDCCH and the CSI determined based on the subband where the first PRB pair is located. .

6. A method for feeding back channel state information CSI, characterized by including:

Receive a CSI set sent by the user equipment UE, where the CSI set includes first CSI and second CSI, the resource granularity of the first CSI is a pair of physical resource blocks (PRB) occupied by the enhanced physical downlink control channel EPDCCH, and the third The resource granularity of the first CSI and the second CSI are different; according to the CSI set, the channel state of the downlink channel between the base station and the UE is determined.

7. The method according to claim 6, wherein the resource granularity of the second CSI is system bandwidth, and the first CSI includes CSI obtained based on the PRB pair occupied by the EPDCCH; or

The resource granularity of the second CSI is system bandwidth, and the first CSI is the difference between the CSI determined based on the PRB pair occupied by the EPDCCH and the second CSI.

8. The method according to claim 6, wherein the resource granularity of the second CSI is a system subband.

9. The method according to claim 8, characterized in that, the first CSI includes CSI obtained based on the first PRB pair occupied by the EPDCCH, and the second CSI includes CSI obtained based on the first PRB pair except where the first PRB pair is located. CSI determined by system subbands outside the subband.

10. The method according to claim 8, characterized in that, the first CSI is the difference between the CSI determined based on the first PRB pair occupied by the EPDCCH and the CSI determined based on the subband where the first PRB pair is located. .

11. A user equipment UE, characterized in that it includes:

Determining module, configured to determine a CSI set, the CSI set includes a first CSI and a second CSI, the resource granularity of the first CSI is a physical resource block PRB pair occupied by the enhanced physical downlink control channel EPDCCH, and the third CSI The resource granularity of the first CSI and the second CSI are different;

A sending module, configured to send the CSI set determined by the determining module to the base station.

12. The UE according to claim 11, wherein the resource granularity of the second CSI is system bandwidth, and the first CSI includes CSI obtained based on the PRB pair occupied by the EPDCCH; or

13. The UE according to claim 11, wherein the resource granularity of the second CSI is a system subband.

14. The UE according to claim 13, characterized in that, the first CSI includes CSI obtained based on the first PRB pair occupied by the EPDCCH, and the second CSI includes CSI obtained based on the first PRB pair except where the first PRB pair is located. CSI determined by system subbands outside the subband.

15. The UE according to claim 13, wherein the first CSI is the difference between the CSI determined based on the first PRB pair occupied by the EPDCCH and the CSI determined based on the subband where the first PRB pair is located. .

16. A base station, characterized in that it includes:

A receiving module, configured to receive a CSI set sent by the user equipment UE. The CSI set includes a first CSI and a second CSI. The resource granularity of the first CSI is a pair of physical resource blocks (PRB) occupied by the enhanced physical downlink control channel EPDCCH. , and the resource granularity of the first CSI and the second CSI is different;

A determining module, configured to determine the channel status of the downlink channel between the base station and the UE according to the CSI set received by the receiving module.

17. The base station according to claim 16, wherein the resource granularity of the second CSI is system bandwidth, and the first CSI includes CSI obtained based on the PRB pair occupied by the EPDCCH; or

18. The base station according to claim 16, characterized in that the resource granularity of the second CSI is a system subband.

19. The base station according to claim 18, characterized in that, the first CSI includes CSI obtained based on the first PRB pair occupied by the EPDCCH, and the second CSI includes CSI obtained based on the first PRB pair except where the first PRB pair is located. CSI determined by system subbands outside the subband.

20. The base station according to claim 18, characterized in that, the first CSI is the difference between the CSI determined based on the first PRB pair occupied by the EPDCCH and the CSI determined based on the subband where the first PRB pair is located. .