CN102307083A - Aperiodic Feedback of Channel State Information and Its Scheduling Method, Device and System - Google Patents

Abstract

The invention discloses a non-periodic feedback of channel state information and a scheduling method, a device and a system thereof, which are used for the non-periodic feedback of the channel state information supporting the transmission of an enhanced downlink physical control channel (E-PDCCH). The method specifically comprises the following steps: receiving a downlink signaling, wherein the downlink signaling is used for triggering aperiodic feedback of channel state information supporting transmission of an enhanced downlink physical control channel (E-PDCCH); obtaining channel state information to be fed back based on an estimated value of a downlink channel, wherein the channel state information comprises sub-band CQI information corresponding to sub-bands divided by available resources transmitted by the configured E-PDCCH; and sending the channel state information to a base station side at the set time after receiving the downlink signaling.

Description

Aperiodic Feedback of Channel State Information and Its Scheduling Method, Device and System

technical field

The present invention relates to the field of communication technology, in particular to a non-periodic feedback of channel state information and its scheduling method, device and system.

Background technique

In the long-term evolution (LTE, long-tern evolution) system, the physical downlink control channel (PDCCH, physical downlink control channel) is sent in each wireless subframe, and shared with the physical downlink channel (PDSCH, physical downlink shared channel) A multiplexing relationship of time division multiplexing (TDM, timedivision multiplexing) is formed. PDCCH is transmitted through the first N orthogonal frequency division multiplexing (OFDM, orthogonal frequency division multiplexing) symbols of a downlink subframe, where N may be 1, 2, 3, 4, and N=4 is only allowed to appear in the system In a system with a bandwidth of 1.4MHz.

Fig. 1 schematically shows the multiplexing relationship between a control region and a data region in a downlink subframe. As shown in Figure 2, the control region for transmitting PDCCH in the LTE system is composed of logically divided control channel elements (CCE, control channel element), where the mapping from CCE to resource element (RE, resource element) adopts a fully interleaved Way. The transmission of downlink control information (DCI, downlink control information) is also based on the unit of CCE. A DCI for a user equipment (UE, user equipment) can be sent in N consecutive CCEs. The possible value of N in the LTE system 1, 2, 4, 8, called CCE aggregation level (Aggregation Level). The UE performs PDCCH blind detection in the control area to search whether there is a PDCCH sent for it. The blind detection uses the radio network temporary identifier (RNTI, radio network temporary identifier) of the UE to decode different DCI formats and CCE aggregation levels. Try, if the decoding is correct, DCI for that UE is received. Each downlink subframe in the discontinuous reception (DRX, discontinuous reception) state of the LTE UE needs to perform blind detection on the control area to search for the PDCCH.

Due to technologies such as multi-user multiple-input multiple-output (MU-MIMO, multi-user multiple-input multiple-output), coordinated multi-point (CoMP, coordinated multiple point), carrier aggregation and the remote end of the same cell identifier (identifier, ID) With the introduction of configurations such as remote radio head (RRH) and 8 antennas, the capacity and transmission efficiency of the physical downlink shared channel of the LTE-Advanced system will be greatly improved; while relatively early LTE versions (such as Rel-8/ 9), the physical downlink control channel of the LTE-Advanced system has not benefited from the new technology and has been improved.

On the one hand, the application of new technology enables PDSCH to provide data transmission for more users at the same time, which will greatly increase the demand for PDCCH channel capacity; on the other hand, the user-specific reference signal (UE-RS, user- Specific reference signal) and new technologies such as relay PDCCH (R-PDCCH, Relay-PDCCH) applied in relay backhaul (Relaybackhaul) provide applicable technologies and experience for the enhancement of PDCCH.

In order to solve the limited capacity of the downlink control channel and improve the transmission efficiency of downlink control information, a solution is: while retaining the original PDCCH domain, transmit the enhanced PDCCH in the PDSCH domain in the downlink subframe. The original PDCCH domain still adopts the existing transmission and reception technology, and uses the original PDCCH resources. For example, transmit diversity is used when transmitting, and blind detection technology is adopted based on the cell-specific reference signal (CRS, cell-specific reference signal) when receiving. The DCI is blindly detected in the search space and the user-specific search space, occupying the first N OFDM symbols for transmission, where the possible values of N are 1, 2, 3, 4, and N=4 is only allowed to appear in the system bandwidth of 1.4MHz In the system, this part of the PDCCH domain is called the legacy PDCCH domain. The enhanced PDCCH domain can use more advanced sending and receiving technologies, such as precoding when sending, detection based on DM-RS when receiving, occupying time-frequency resources outside the legacy PDCCH domain for transmission, and using part of the original PDSCH resources, Multiplexed with PDSCH through frequency division, this part of the PDCCH domain is called Enhanced PDCCH domain. The scheme in which the Enhanced PDCCH and the PDSCH are multiplexed by means of frequency division multiplexing (FDM, frequency division multiplexing) is called FDM E-PDCCH.

The resource position used by the PDSCH can be indicated through the downlink control information DCI in the PDCCH. For the enhanced PDCCH, one method is to indicate the resource position used by the E-PDCCH only through high-layer signaling. Since the interaction period of the high-layer signaling is long, if the exact E-PDCCH resource location is indicated by the high-layer signaling, the E-PDCCH cannot fully obtain the frequency selectivity gain. Therefore, in general, high-layer signaling will allocate a set of available resources for E-PDCCH. During transmission, the base station can select some resources for E-PDCCH within the range of available resources configured by high-layer based on the channel state information fed back by the UE. When the UE receives E-PDCCH resources, it can perform E-PDCCH blind detection within the range of available resources configured by higher layers. In this way, a compromise between blind detection complexity and scheduling freedom is obtained.

Fig. 2 is an enhanced PDCCH structure. Referring to Fig. 2, to support enhanced PDCCH transmission, corresponding channel state information feedback is required. For example, the channel quality indicator (CQI) is used for user scheduling, determining the aggregation level and/or adjusting the modulation and coding scheme (modulation and coding scheme, MCS) and/or MU-MIMO pairing, etc., the precoding matrix indicator (precoding matrix indicator, PMI) is used to determine beamforming, multi-user scheduling, MU-MIMO pairing, etc., and RI information can be used to determine the number of layers used for data transmission, etc.

Currently, the LTE/LTE-A system supports five aperiodic feedback modes of channel state information, as shown in Table 1.

Table 1: CQI and PMI Feedback Types for PUSCH CSI reporting Modes

Among them, Mode 1-2 is wideband CQI feedback. Due to the small amount of E-PDCCH data, it may only occupy a small time-frequency resource and requires higher transmission reliability, which requires more accurate channel information feedback. Existing Mode 1 -2 Cannot provide E-PDCCH with CQI information with smaller granularity in the frequency domain, so it is not suitable for channel state information feedback of E-PDCCH transmission;

Modes 2-0 and 2-2 are used to feed back the subband CQI (or PMI/CQI) and wideband CQI (or PMI/CQI) selected by the user. On the one hand, if a set of available resources is configured by high-level and combined with UE blind detection to determine E - In the way of PDCCH resource location, the subband CQI selected by the UE is not necessarily within the range of available resources configured by the upper layer. At this time, it is impossible to provide PMI and/or CQI information with smaller frequency domain granularity for E-PDCCH; On the one hand, the size of the subband and BP (bandwidth part) corresponding to the subband CQI in modes 2-0 and 2-2 is related to the system bandwidth, as shown in Table 2, without considering the available resources configured by the upper layer . Since the amount of E-PDCCH data is small, the frequency domain resources occupied by it may be much smaller than the subband size in the current subband CQI feedback. Therefore, modes 2-0 and 2-2 cannot well support E-PDCCH transmission;

Table 2: Subband Size(k) vs. Downlink System Bandwidth

Mode 3-0 and Mode 3-1 are used for wideband CQI (or CQI/PMI) and subband CQI feedback. The same problem as in modes 2-0 and 2-2, the subband CQI corresponds to the system bandwidth and does not consider the available resources configured by the upper layers. In addition, Mode 3-1 does not include subband PMI reporting, which cannot meet the requirements of the E-PDCCH for smaller granularity PMI feedback.

In the feedback mode including RI feedback, the rank indication (RI, rankindication) value fed back for PDSCH transmission may be high (maximum RI=8), and only low-rank (Rank) or even rank=1 transmission is required, When the feedback PMI is high Rank, and the number of data layers supported by E-PDCCH transmission is lower than the feedback RI value, PMI can only be obtained through the codebook nesting feature, and the PMI information at this time is often not for low Rank spatial channels Information quantization is not good, which will cause poor transmission performance of the E-PDCCH.

To sum up, the enhanced PDCCH transmission can increase the PDCCH capacity and improve the PDCCH transmission efficiency by utilizing the original PDSCH resources and using beamforming and other transmission technologies. Compared with ordinary data transmission, the enhanced PDCCH may only occupy a small amount of time-frequency resources due to the small amount of data, only require low Rank or even Rank=1 transmission, and require higher transmission reliability, thus requiring a more accurate channel Information feedback, etc., specifically:

Mode 1-2 cannot meet the requirement of E-PDCCH for channel state information feedback with smaller frequency domain granularity;

The selected subbands in mode 2-0 and mode 2-2 are not necessarily within the available resource range of the E-PDCCH configured by the upper layer, and at this time, it is also impossible to meet the channel state information feedback requirements of the E-PDCCH with a smaller granularity in the frequency domain; However, the RI fed back in Mode 2-2 may be higher than the maximum number of Ranks that can be supported by E-PDCCH transmission. At this time, the low Rank PMI quantization performance obtained by using the nesting feature will be lost.

Modes 3-0 and 3-1 cannot meet the requirements of E-PDCCH for PMI feedback with smaller granularity.

Therefore, the existing feedback mode designed for ordinary data transmission will not be suitable for enhanced PDCCH transmission.

Contents of the invention

The present invention provides an aperiodic feedback of channel state information and its scheduling method, device and system, enabling the aperiodic feedback of channel state information supporting enhanced downlink physical control channel E-PDCCH transmission.

An aperiodic feedback method of channel state information provided by an embodiment of the present invention includes:

receiving downlink signaling, where the downlink signaling is used to trigger aperiodic feedback of channel state information supporting enhanced downlink physical control channel E-PDCCH transmission;

Obtain channel state information to be fed back based on the estimated value of the downlink channel, where the channel state information includes subband CQI information corresponding to the subbands divided into the configured available resources for E-PDCCH transmission;

Sending the channel state information to the base station side at a set time after receiving the downlink signaling.

An aperiodic feedback method for scheduling channel state information provided by an embodiment of the present invention includes:

Sending downlink signaling to the terminal side, where the downlink signaling is used to trigger aperiodic feedback of channel state information supporting enhanced downlink physical control channel E-PDCCH transmission;

The channel state information fed back by the terminal side is received, where the channel state information includes subband CQI information corresponding to the subbands into which the configured available resources for E-PDCCH transmission are divided.

An aperiodic feedback device for scheduling channel state information provided by an embodiment of the present invention includes:

A scheduling unit, configured to send downlink signaling to the terminal side, where the downlink signaling is used to trigger aperiodic feedback of channel state information supporting enhanced downlink physical control channel E-PDCCH transmission;

The receiving unit is configured to receive channel state information fed back by the terminal side, where the channel state information includes subband CQI information corresponding to subbands into which the configured available resources for E-PDCCH transmission are divided.

An aperiodic feedback device for channel state information provided by an embodiment of the present invention includes:

A receiving unit, configured to receive downlink signaling, where the downlink signaling is used to trigger aperiodic feedback of channel state information supporting enhanced downlink physical control channel E-PDCCH transmission;

A channel estimation unit, configured to obtain channel state information to be fed back based on the estimated value of the downlink channel, the channel state information including the subband CQI information corresponding to the subbands divided into the available resources of the configured E-PDCCH transmission;

The sending unit is configured to send the channel state information to the base station side at a set time after receiving the downlink signaling.

An aperiodic feedback system for scheduling channel state information provided by an embodiment of the present invention includes:

The base station is configured to send downlink signaling to the terminal side, and the downlink signaling is used to trigger aperiodic feedback of channel state information supporting enhanced downlink physical control channel E-PDCCH transmission; receive channel state information fed back by the terminal side;

The terminal is used to receive downlink signaling, and the downlink signaling is used to trigger aperiodic feedback of channel state information supporting enhanced downlink physical control channel E-PDCCH transmission; obtain the channel state to be fed back based on the estimated value of the downlink channel Information, the channel state information includes the subband CQI information corresponding to the subbands divided into the available resources of the configured E-PDCCH transmission; at the set time after receiving the downlink signaling, send the channel state information.

In the embodiment of the present invention, after receiving the downlink signaling used to trigger the aperiodic feedback of the channel state information supporting the enhanced downlink physical control channel E-PDCCH transmission, the terminal side obtains the channel to be fed back based on the estimated value of the downlink channel State information, and the channel state information includes the subband CQI information corresponding to the subbands divided into the available resources of the configured E-PDCCH transmission, so as to adapt to the enhanced PDCCH transmission, occupying less time and frequency resources, requiring low Rank and The feature of high feedback accuracy, therefore, can better support enhanced PDCCH transmission.

Description of drawings

FIG. 1 is a schematic diagram of a multiplexing relationship between a control region and a data region in a downlink subframe;

FIG. 2 is a schematic structural diagram of an enhanced PDCCH;

FIG. 3 is a schematic flowchart of a method for aperiodic feedback of channel state information in this embodiment;

FIG. 4 is a schematic flow chart of an aperiodic feedback method for scheduling channel state information according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a device corresponding to the method shown in FIG. 3 according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a device corresponding to the method shown in FIG. 4 according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a system implementing aperiodic feedback of scheduling information status information according to an embodiment of the present invention.

Detailed ways

In view of the characteristics that the enhanced PDCCH transmission occupies less time-frequency resources and requires low Rank and high feedback accuracy, in this embodiment, the terminal side receives downlink signaling, and the downlink signaling is used to trigger the transmission of the enhanced E-PDCCH. Aperiodic feedback of channel state information; based on the estimated value of the downlink channel, the channel state information to be fed back is obtained, including the subband CQI information corresponding to the subbands divided into the available resources of the configured E-PDCCH transmission; Sending the channel state information to the base station side at a set time after receiving the downlink signaling.

In this embodiment, on the base station side, the downlink signaling is sent to the terminal side, and the downlink signaling is used to trigger aperiodic feedback of channel state information supporting enhanced downlink physical control channel E-PDCCH transmission; receiving the channel state fed back by the terminal side Information, the channel state information includes subband CQI information corresponding to subbands included in the configured available resources for E-PDCCH transmission.

Wherein, the configured available resources for E-PDCCH transmission may be divided into M subbands, where M is an integer, and M>=1.

Referring to FIG. 3, the aperiodic feedback method of channel state information in this embodiment is equivalent to the processing process of the terminal, and specifically includes:

Step 301: Receive downlink signaling, where the downlink signaling is used to trigger aperiodic feedback of channel state information supporting enhanced downlink physical control channel E-PDCCH transmission.

Step 302: Obtain channel state information to be fed back based on the estimated value of the downlink channel, where the channel state information includes subband CQI information corresponding to the subbands into which the configured available resources for E-PDCCH transmission are divided.

Step 303: Send the channel state information to the base station side at a set time after receiving the downlink signaling.

The configured available resources for E-PDCCH transmission include M consecutive resource parts in the frequency domain, there are frequency domain intervals between the resource parts in the continuous frequency domain, and each resource part in the continuous frequency domain is a subband.

The channel state information may also include subband PMI information or wideband PMI information, the subband PMI information includes subband PMI calculated based on RI=1, and the wideband PMI information includes wideband PMI calculated based on RI=1 . Here, RI=1 is an assumed value adopted by the terminal side, and other preset fixed values may also be adopted. At this time, the subband CQI is calculated based on RI=1 and the determined PMI value.

When the channel state information may further include wideband PMI information, the wideband range may be the downlink system wideband or the total bandwidth of available resources for E-PDCCH transmission configured.

Based on the solutions of the foregoing embodiments, the channel state information may further include reported RI information, and the value range of the RI information is RI information<=N, where N is a natural number. For example: N=2.

The channel state information may also include PMI information and subband CQI information calculated based on the reported RI, for example: when Rank=1 and Rank=2, the corresponding PMI information and subband CQI information. The PMI information is subband PMI information or wideband PMI information; or, the PMI information includes subband PMI information and wideband PMI information.

Specifically, the channel state information may be sent to the base station side through a physical uplink control channel PUSCH.

When the channel state information includes subband CQI information, the PUSCH includes a subfield for carrying the CQI information. This mode is recorded as: PUSCH mode e-0-1, as shown in Table 3a, includes 1 PUSCH field for reporting subband CQI. Wherein, B _subCQI represents the number of bits included in each subband CQI.

field Bit width Subband CQI M*B _subCQI

Table 3a

When the channel state information includes subband PMI information and subband CQI information, the PUSCH includes a subfield for carrying subband CQI information and subband PMI information, denoted as PUSCH modee-1-1, as shown in Table As shown in 3b, it includes a PUSCH field for reporting subband PMI/CQI. Wherein, the PMI and CQI are calculated based on RI=1, the subband CQI is calculated based on the subband PMI, and B _subPMI indicates the number of bits included in each subband PMI.

field Bit width Subband CQI M ^* B _subCQI Subband PMI M ^* B _subPMI

Table 3b

Of course, when the channel state information includes subband PMI information and subband CQI information, it may also include a subfield for carrying subband PMI information and a subfield for carrying subband CQI information.

When the channel state information includes RI information, subband PMI information, and subband CQI information, the PUSCH may include a subfield for carrying RI information, and a subfield for carrying subband PMI information and subband CQI information. Subdomains. Denoted as PUSCH mode e-1-2, it includes two PUSCH fields, which are used to report RI and subband PMI/CQI respectively. As shown in Table 3c, it is the RI reporting field, and the bit bandwidth is 1. Referring to Table 3d, the subband PMI/CQI reporting field includes subband CQI and subband PMI when RI=1 and R1=2. Among them, B _subPMI represents the number of bits contained in each sub-band PMI calculated based on RI=1, B _subCQI represents the number of bits contained in each sub-band CQI calculated based on RI=1, and B _subPMI2 represents the number of bits contained in each sub-band PMI calculated based on RI=2. The number of bits included in subband PMI, B _subCQI2 indicates the number of bits included in each subband CQI calculated based on RI=2.

field Bit width RI 1

Table 3c

field Bit width subband CQI on assumption of RI＝1 M*B _subCQI subband CQI on assumption of RI＝2 M*B _subCQI2 Subband PMI on assumption of RI＝1 M*B _subPMI Subband PMI on assumption of RI＝2 M*B _subPMI2

Table 3d

As another embodiment, specifically, the channel state information may include RI, wideband PMI, subband PMI, and subband CQI, which are denoted as PUSCH mode e-1-3. The RI reporting domain is the same as Table 3c. The subband PMI/CQI and wideband PMI reporting fields are shown in Table 3e.

field Bit width subband CQI on assumption of RI＝1 M*B _subCQI subband CQI on assumption of RI＝2 M*B _subCQI2 Subband PMI on assumption of RI＝1 M*B _subPMI wideband PMI on assumption of RI＝2 B _subPMI2

Table 3e

As another embodiment, specifically, the channel state information may include RI, subband PMI, and subband CQI, which are denoted as PUSCH mode e-1-4. The RI reporting domain is the same as Table 3c. The subband PMI/CQI reporting fields are shown in Table 3e. Wherein, B _subPMIx represents the number of bits contained in each sub-band PMI calculated based on the reported RI, and B _subCQIx represents the number of bits contained in each sub-band CQI calculated based on the reported RI.

field Bit width subband CQI on assumption of RI M ^* B _subCQIx Subband PMI on assumption of RI M ^* B _subPMIx

Table 3f

Referring to FIG. 4 , an aperiodic feedback method for scheduling channel state information according to an embodiment of the present invention is equivalent to a processing method on the base station side, and specifically includes the following steps:

Step 401: Send downlink signaling to the terminal side, where the downlink signaling is used to trigger aperiodic feedback of channel state information supporting enhanced downlink physical control channel E-PDCCH transmission;

Step 402: Receive channel state information fed back from the terminal side, where the channel state information includes subband CQI information corresponding to the subbands into which the configured available resources for E-PDCCH transmission are divided.

The channel state information also includes subband PMI information. The subband PMI information includes the subband PMI calculated based on RI=1.

The channel state information also includes wideband PMI information, and the wideband range is the downlink system wideband or the total bandwidth of available resources for E-PDCCH transmission configured. The subband PMI information includes wideband PMI calculated based on RI=1.

The channel state information further includes reported RI information, and the value range of the RI information is RI information<=N, where N is a natural number.

The channel state information also includes PMI information and subband CQI information calculated based on the reported RI, for example: when Rank=1 and Rank=2, the corresponding PMI information and subband CQI information. Wherein, the PMI information is subband PMI information or wideband PMI information; or, the PMI information includes subband PMI information and wideband PMI information.

The base station side can receive the channel state information through the physical uplink control channel PUSCH.

When the channel state information includes subband CQI information, the PUSCH includes a subfield for carrying the CQI information. Specifically, the subband CQI information is obtained from the corresponding subfield.

When the channel state information includes subband PMI information and subband CQI information, the PUSCH includes a subfield for carrying subband CQI information and subband PMI information; or includes a subfield for carrying subband PMI information field, and a subfield for carrying subband CQI information. Obtain subband CQI information, or subband CQI information and subband subband PMI information from corresponding subfields.

When the channel state information includes RI information, subband PMI information and subband CQI information, the PUSCH includes a subfield for carrying RI information, and a subfield for carrying subband PMI information and subband CQI information field; or include a subfield for carrying RI information, subband PMI information and subband CQI information. Subband CQI information, subband PMI information, and RI information are obtained from corresponding subfields.

Corresponding channel state information is received from the PUSCH subfield. Specifically, it is the same as the subfield of the channel state information transmitted by the terminal side, and details are not repeated here.

Referring to FIG. 5, the device for aperiodic feedback of channel state information provided by this embodiment is equivalent to a terminal, including:

The receiving unit 51 is configured to receive downlink signaling, and the downlink signaling is used to trigger aperiodic feedback of channel state information supporting enhanced downlink physical control channel E-PDCCH transmission;

The channel estimation unit 52 is configured to obtain channel state information to be fed back based on the estimated value of the downlink channel, the channel state information including the subband CQI information corresponding to the subbands divided into the available resources of the configured E-PDCCH transmission ;

The sending unit 53 is configured to send the channel state information to the base station side at a set time after receiving the downlink signaling.

The sending unit may be configured to send the channel state information to the base station side through a physical uplink control channel PUSCH.

Specifically, various implementation manners of the configured available resources for E-PDCCH transmission, the channel state information, and the subfield information in the PUSCH are the same as the method shown in FIG. 3 , and will not be repeated here.

Referring to FIG. 6 , an aperiodic feedback device for scheduling channel state information in this embodiment is equivalent to a base station, and specifically includes: a scheduling unit 61 and a receiving unit 62 .

A scheduling unit 61, configured to send downlink signaling to the terminal side, where the downlink signaling is used to trigger aperiodic feedback of channel state information supporting enhanced downlink physical control channel E-PDCCH transmission;

The receiving unit 62 is configured to receive channel state information fed back by the terminal side, where the channel state information includes subband CQI information corresponding to subbands into which the configured available resources for E-PDCCH transmission are divided.

Specifically, various implementation manners of the channel state information and the subfield information in the PUSCH are the same as the method shown in FIG. 4 , and will not be repeated here.

The receiving unit 62 may receive the channel state information through a physical uplink control channel PUSCH.

Referring to FIG. 7 , an aperiodic feedback system for scheduling channel state information in this embodiment includes: a base station 71 and a terminal 72 .

The base station 71 is configured to send downlink signaling to the terminal side, and the downlink signaling is used to trigger aperiodic feedback of channel state information supporting enhanced downlink physical control channel E-PDCCH transmission; the receiving unit is used to receive terminal side feedback channel state information;

The terminal 72 is configured to receive downlink signaling, the downlink signaling is used to trigger aperiodic feedback of channel state information supporting enhanced downlink physical control channel E-PDCCH transmission; based on the estimated value of the downlink channel, obtain the channel to be fed back State information, the channel state information includes the subband CQI information corresponding to the subbands divided into the available resources of the configured E-PDCCH transmission; at the set time after receiving the downlink signaling, send it to the base station side The channel state information.

Specifically, the interaction between the terminal and the base station, as well as the various implementations of the configured available resources for E-PDCCH transmission, the channel state information, and the subfield information in the PUSCH are the same as those shown in FIG. 3 and FIG. 4 The method shown is the same and will not be repeated here.

This embodiment is designed for the characteristics that the enhanced PDCCH transmission occupies less time-frequency resources, requires low Rank and high feedback accuracy, so as to better support the enhanced PDCCH transmission.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (33)

1. A method for aperiodic feedback of channel state information, characterized in that the method comprises: receiving downlink signaling, where the downlink signaling is used to trigger aperiodic feedback of channel state information supporting enhanced downlink physical control channel E-PDCCH transmission; Obtain channel state information to be fed back based on the estimated value of the downlink channel, where the channel state information includes the subband channel quality indicator CQI information corresponding to the division of the configured available resources for E-PDCCH transmission into subbands; Sending the channel state information to the base station side at a set time after receiving the downlink signaling. 2. The method according to claim 1, wherein the configured available resources for E-PDCCH transmission are divided into M subbands, wherein M is an integer, and M>=1. 3. The method according to claim 2, wherein the available resources of the configured E-PDCCH transmission include M consecutive resource parts in the frequency domain, and there is a frequency domain interval between the resource parts in the continuous frequency domain, Each continuous resource part in the frequency domain is a subband. 4. The method according to claim 1, wherein the channel state information further includes subband precoding matrix indication PMI information, and the subband PMI information includes subband PMI calculated based on rank RI being equal to 1. 5. The method according to claim 1, wherein the channel state information also includes wideband PMI information, and the wideband range is the total bandwidth of available resources for downlink system wideband or configured E-PDCCH transmission, and the The broadband PMI information includes the broadband PMI calculated based on RI equal to 1. 6. The method according to claim 1, wherein the channel state information further includes reported RI information, and the value range of the RI information is RI information<=N, where N is a natural number. 7. The method according to any one of claims 1 to 6, wherein the channel state information further includes PMI information and subband CQI information calculated based on the reported RI, wherein, The PMI information is subband PMI information or wideband PMI information; or, the PMI information includes subband PMI information and wideband PMI information. 8. The method according to claim 1, wherein the channel state information is sent to the base station side through a physical uplink control channel (PUSCH). 9. The method of claim 8, wherein The PUSCH includes a subfield for carrying subband CQI information; When the channel state information further includes subband PMI information, the PUSCH includes a subfield for carrying subband CQI information and subband PMI information; or includes a subfield for carrying subband PMI information, and a subfield for carrying subband CQI information; When the channel state information further includes RI information and subband PMI information, the PUSCH includes a subfield for carrying RI information, and a subfield for carrying subband PMI information and subband CQI information; When the channel state information further includes RI information, subband PMI information and wideband PMI information, the PUSCH includes a subfield for carrying RI information, and a subfield for carrying subband PMI information, wideband PMI information and subband PMI information. Subfield with CQI information. 10. An aperiodic feedback method for scheduling channel state information, characterized in that the method comprises: Sending downlink signaling to the terminal side, where the downlink signaling is used to trigger aperiodic feedback of channel state information supporting enhanced downlink physical control channel E-PDCCH transmission; The channel state information fed back by the terminal side is received, where the channel state information includes subband CQI information corresponding to the subbands into which the configured available resources for E-PDCCH transmission are divided. 11. The method according to claim 10, wherein the channel state information further includes subband PMI information, and the subband PMI information includes subband PMI calculated based on RI=1. 12. The method according to claim 10, wherein the channel state information further comprises wideband PMI information, and the wideband range is the total bandwidth of the downlink system wideband or configured E-PDCCH transmission available resources, the The subband PMI information includes wideband PMI calculated based on RI=1. 13. The method according to claim 10, 11 or 12, wherein the channel state information further includes reported RI information, and the value range of the RI information is RI information<=N, where N is a natural number. 14. The method according to claim 13, wherein the channel state information further comprises PMI information and subband CQI information calculated based on the reported RI, wherein, The PMI information is subband PMI information or wideband PMI information; or, the PMI information includes subband PMI information and wideband PMI information. 15. The method according to claim 10, wherein the channel state information is received through a physical uplink control channel (PUSCH). 16. The method of claim 15, wherein, The PUSCH includes a subfield for carrying subband CQI information; When the channel state information also includes subband PMI information, the PUSCH includes a subfield for carrying subband CQI information and subband PMI information; or includes a subfield for carrying subband PMI information, and A subfield for carrying subband CQI information; When the channel state information further includes RI information and subband PMI information, the PUSCH includes a subfield for carrying RI information, and a subfield for carrying subband PMI information and subband CQI information; When the channel state information includes RI information, subband PMI information and wideband PMI information, the PUSCH includes a subfield for carrying RI information, and a subfield for carrying subband PMI information, wideband PMI information and subband CQI information subdomain. 17. A device for aperiodic feedback of channel state information, comprising: A receiving unit, configured to receive downlink signaling, where the downlink signaling is used to trigger aperiodic feedback of channel state information supporting enhanced downlink physical control channel E-PDCCH transmission; A channel estimation unit, configured to obtain channel state information to be fed back based on the estimated value of the downlink channel, the channel state information including the subband CQI information corresponding to the subbands divided into the available resources of the configured E-PDCCH transmission; The sending unit is configured to send the channel state information to the base station side at a set time after receiving the downlink signaling. 18. The apparatus according to claim 17, wherein the configured available resource for E-PDCCH transmission is divided into M subbands, wherein M is an integer, and M>=1. 19. The device according to claim 18, wherein the configured available resources for E-PDCCH transmission include M resource parts with continuous frequency domains, and there are frequency domain intervals between the resource parts with continuous frequency domains, Each continuous resource part in the frequency domain is a subband. 20. The apparatus according to claim 17, wherein the channel state information further includes subband PMI information, and the subband PMI information includes subband PMI calculated based on RI=1. 21. The device according to claim 17, wherein the channel state information further includes wideband PMI information, and the wideband range is the downlink system wideband or the total bandwidth of available resources for E-PDCCH transmission configured, the The broadband PMI information includes the broadband PMI calculated based on RI=1. 22. The device according to claim 17, wherein the channel state information further includes RI information, and the value range of the RI information is RI information<=N, where N is a natural number. 23. The apparatus according to claim 22, wherein the channel state information further comprises PMI information and subband CQI information calculated based on the reported RI, wherein, The PMI information is subband PMI information or wideband PMI information; or, the PMI information includes subband PMI information and wideband PMI information. 24. The device according to claim 17, wherein the sending unit is configured to send the channel state information to the base station side through a physical uplink control channel (PUSCH). 25. The apparatus of claim 24, wherein The PUSCH includes a subfield for carrying subband CQI information; When the channel state information further includes subband PMI information, the PUSCH includes a subfield for carrying subband CQI information and subband PMI information; or includes a subfield for carrying subband PMI information, and a subfield for carrying subband subband CQI information; When the channel state information further includes RI information and subband PMI information, the PUSCH includes a subfield for carrying RI information, and a subfield for carrying subband PMI information and subband CQI information; When the channel state information includes RI information, subband PMI information and wideband PMI information, the PUSCH includes a subfield for carrying RI information, and a subfield for carrying subband PMI information, wideband PMI information and subband CQI information subdomain. 26. An aperiodic feedback device for scheduling channel state information, characterized in that it comprises: A scheduling unit, configured to send downlink signaling to the terminal side, where the downlink signaling is used to trigger aperiodic feedback of channel state information supporting enhanced downlink physical control channel E-PDCCH transmission; The receiving unit is configured to receive channel state information fed back by the terminal side, where the channel state information includes subband CQI information corresponding to subbands into which the configured available resources for E-PDCCH transmission are divided. 27. The apparatus according to claim 26, wherein the channel state information further includes subband PMI information, and the subband PMI information includes PMI calculated based on RI=1. 28. The device according to claim 26, wherein the channel state information further includes broadband PMI information, and the broadband range is the total bandwidth of available resources for downlink system broadband or configured E-PDCCH transmission, so The broadband PMI information includes the PMI calculated based on RI=1. 29. The device according to claim 26, 27 or 28, wherein the channel state information further includes RI information, and the value range of the RI information is RI information<=N, where N is a natural number. 30. The apparatus according to claim 27, wherein the channel state information further comprises PMI information and subband CQI information calculated based on the reported RI. 31. The device according to claim 26, wherein the receiving unit is configured to receive the channel state information through a Physical Uplink Control Channel (PUSCH). 32. The apparatus of claim 29, wherein The PUSCH includes a subfield for carrying subband CQI information; When the channel state information further includes subband PMI information, the PUSCH includes a subfield for carrying subband CQI information and subband PMI information; or includes a subfield for carrying subband PMI information, and a subfield for carrying subband CQI information; When the channel state information further includes RI information and subband PMI information, the PUSCH includes a subfield for carrying RI information, and a subfield for carrying subband PMI information and CQI information; or includes A subfield for carrying RI information, subband PMI information and subband CQI information. 33. An aperiodic feedback system for scheduling channel state information, characterized in that it comprises: The base station is configured to send downlink signaling to the terminal side, and the downlink signaling is used to trigger aperiodic feedback of channel state information supporting enhanced downlink physical control channel E-PDCCH transmission; the receiving unit is used to receive feedback from the terminal side channel status information; The terminal is used to receive downlink signaling, and the downlink signaling is used to trigger aperiodic feedback of channel state information supporting enhanced downlink physical control channel E-PDCCH transmission; obtain the channel state to be fed back based on the estimated value of the downlink channel Information, the channel state information includes the subband CQI information corresponding to the subbands divided into the available resources of the configured E-PDCCH transmission; at the set time after receiving the downlink signaling, send the channel state information.

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