CN109474321B

CN109474321B - Feedback of channel state information, resource allocation method, terminal, base station and device

Info

Publication number: CN109474321B
Application number: CN201710804822.9A
Authority: CN
Inventors: 李辉; 高秋彬; 塔玛拉卡·拉盖施; 陈润华; 苏昕; 缪德山; 黄秋萍; 王蒙军
Original assignee: Telecommunications Science and Technology Research Institute Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2017-09-08
Filing date: 2017-09-08
Publication date: 2021-01-22
Anticipated expiration: 2037-09-08
Also published as: CN109474321A; WO2019047782A1

Abstract

The invention provides a feedback of channel state information, a resource allocation method, a terminal, a base station and a device, wherein the feedback method comprises the following steps: measuring a target downlink channel and determining target CSI of the target downlink channel; decomposing the target CSI into a first CSI and a second CSI; wherein the first CSI comprises: the method comprises the steps that a target RI, a first PMI formed by information required by constructing a precoding matrix with RI equal to 1 in the target PMI and a first CQI calculated according to the first PMI are obtained; receiving a first indication signaling, and feeding back the first CSI on a first uplink channel resource allocated by a base station; and/or receiving a second indication signaling, and feeding back the second CSI on a second uplink channel resource allocated by the base station; the embodiment of the invention can ensure the accuracy of CSI feedback and the effective utilization of uplink channel resources.

Description

Feedback of channel state information, resource allocation method, terminal, base station and device

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method, a terminal, a base station, and an apparatus for channel state information feedback and resource allocation.

Background

In a MIMO (Multiple-Input Multiple-Output) system, when a terminal reports CSI (Channel State Information), load overhead changes dynamically.

And the terminal calculates the channel state information CSI through downlink channel measurement. The CSI includes RI (rank indication)/PMI (Precoding Matrix Indicator)/CQI (Channel Quality Indicator), and may further include a CSI-RS (Channel state information reference signal) resource indication CRI. In order to enable the terminal to report the CSI to the base station for scheduling by the base station, the base station needs to allocate uplink channel resources for the terminal to report the CSI. For a certain codebook configuration of the base station, the CSI load reported by the terminal will dynamically change with the difference of RI. In an LTE (long term evolution) system, for a Class a codebook or an Advanced CSI codebook, differences in CSI load caused by differences in RI are not large, and thus required uplink channel resources can be allocated according to the largest possible CSI feedback overhead.

A type I codebook and a type II codebook are defined in an NR (5G air interface) system. The feedback information structure of the type II codebook and the PMI feedback overhead at 32 ports are given in table 1 and table 2. Assuming that the number L of beam combinations of the codebook configured by the base station is 3, when the terminal performs CSI calculation, it may feedback RI 1 (using rank 1 codebook) or RI 2 (using rank 2 codebook). If the terminal determines RI to be 1, the total PMI is 192 bits, and if the terminal determines RI to be 2, the total PMI is 370 bits. This indicates that the dynamic range of its PMI varies greatly, and the overhead of the feedback of different RIs differs by 178 bits. Since the base station cannot know the load size of the CSI before obtaining the RI information, the base station can only allocate uplink channel resources to the terminal according to a certain possible load size. The allocation of the resources needs to ensure both the accuracy of feedback and the reasonable utilization of uplink resources.

Table 132 PMI feedback overhead (wideband part) for port type II codebook

PMI feedback overhead (subband portion) for table 232 port type II codebook

In summary, for the codebook defined by the NR system, the dynamic range of the load overhead is large, and if the uplink information resource is allocated according to the maximum overhead, a large waste of the resource may be caused. If the allocated uplink resource is small, the feedback accuracy cannot be guaranteed. Therefore, the conventional resource allocation method cannot meet the requirement of the NR system.

Disclosure of Invention

The invention aims to provide a feedback of channel state information, a resource allocation method, a terminal, a base station and a device, and aims to solve the problem that the existing resource allocation mode cannot meet the dynamic change of load overhead of the channel state information.

In order to solve the above problem, an embodiment of the present invention provides a method for feeding back channel state information CSI, including:

measuring a target downlink channel and determining target CSI of the target downlink channel; the target CSI includes: a target Rank Indication (RI), a target Precoding Matrix Indication (PMI) and a target Channel Quality Indication (CQI);

decomposing the target CSI into a first CSI and a second CSI; wherein the first CSI comprises: the method comprises the steps that a target RI, a first PMI formed by information required by constructing a precoding matrix with RI equal to 1 in the target PMI and a first CQI calculated according to the first PMI are obtained; the second CSI includes: the residual PMIs except the first PMI in the target PMI and the target CQI;

receiving a first indication signaling, and feeding back the first CSI on a first uplink channel resource allocated by a base station; and/or receiving a second indication signaling, and feeding back the second CSI on a second uplink channel resource allocated by the base station.

Wherein, if the target CSI further comprises: channel state information reference symbol resource indication, CRI;

the first CSI further comprises: the channel state information reference symbol resource indicates CRI.

Wherein, when the target RI is equal to 1, the target CSI is the first CSI, and the second CSI is null.

Wherein the target PMI comprises: twiddle factor, beam selection, strongest coefficient of each layer, bandwidth amplitude of each layer, subband amplitude of each layer and subband phase of each layer;

wherein, the number of layers contained in the target PMI is equal to the value of the target RI.

Wherein the first PMI comprises: the method comprises the steps of rotating factors, beam selection, the strongest coefficient of a first layer, the bandwidth amplitude of the first layer, the subband amplitude of the first layer and the subband phase of the first layer;

the remaining PMIs include: the strongest coefficients of the remaining layers other than the first layer, the bandwidth amplitudes of the remaining layers other than the first layer, the subband amplitudes of the remaining layers other than the first layer, and the subband phases of the remaining layers other than the first layer.

Wherein, the step of receiving the first indication signaling and feeding back the first CSI on the first uplink channel resource allocated by the base station includes:

receiving a first indication signaling;

integrally coding the first CSI to obtain a coded first CSI; or dividing the first CSI into a plurality of parts and independently coding each part to obtain coded first CSI;

and feeding back the coded first CSI on the first uplink channel resource allocated by the base station.

Wherein, the step of receiving the second indication signaling and feeding back the second CSI on the second uplink channel resource allocated by the base station includes:

receiving a second indication signaling;

integrally coding the second CSI to obtain coded second CSI; or dividing the second CSI into a plurality of parts and independently coding each part to obtain coded second CSI;

and feeding back the coded second CSI on a second uplink channel resource allocated by the base station.

The embodiment of the invention also provides a resource allocation method, which comprises the following steps:

allocating a first uplink channel resource to the terminal according to the overhead of the channel state information CSI with the rank indication RI equal to 1; the first uplink channel resource is used for the terminal to feed back first CSI;

and sending a first indication signaling for indicating the terminal to feed back the first CSI to the terminal, and allocating the first uplink channel resource to the terminal.

After the step of sending a first indication signaling for indicating the terminal to feed back the first CSI to the terminal and allocating the first uplink channel resource to the terminal, the method further includes:

receiving first CSI fed back by a terminal on a first uplink channel resource;

and analyzing the first CSI and determining the value of the target RI contained in the first CSI.

After the step of analyzing the first CSI and determining a value of a target RI included in the first CSI, the method further includes:

if the value of the target RI is greater than 1, acquiring the overhead of a second CSI;

allocating a second uplink channel resource to the terminal according to the overhead of the second CSI; the second uplink channel resource is used for the terminal to feed back second CSI;

and sending a second indication signaling for indicating the terminal to feed back the second CSI to the terminal, and allocating the second uplink channel resource to the terminal.

Wherein the overhead of the second CSI comprises:

a target precoding matrix corresponding to the target RI indicates the overhead of the rest PMIs except the first PMI in the PMI; wherein the first PMI is formed by information required for constructing a precoding matrix with RI equal to 1 in the target PMI;

and an overhead of the target channel quality indication CQI corresponding to the target RI.

if the value of the target RI is equal to 1, scheduling according to the first CSI;

and if the value of the target RI is greater than 1, modifying the target RI contained in the first CSI into 1, and scheduling according to the first CSI.

After the step of sending a second indication signaling for indicating the terminal to feed back the second CSI to the terminal and allocating the second uplink channel resource to the terminal, the method further includes:

receiving second CSI fed back by the terminal on a second uplink channel resource;

and combining the first CSI and the second CSI, and scheduling according to the combined CSI.

An embodiment of the present invention further provides a terminal, including: a transceiver, a memory, a processor and a computer program stored on the memory and executable on the processor, the processor being configured to read a program in the memory and perform the following processes:

the transceiver is used for receiving a first indication signaling and feeding back the first CSI on a first uplink channel resource allocated by a base station; and/or receiving a second indication signaling, and feeding back the second CSI on a second uplink channel resource allocated by the base station.

Wherein the transceiver is further configured to: receiving a first indication signaling;

the processor is further configured to perform the following process: integrally coding the first CSI to obtain a coded first CSI; or dividing the first CSI into a plurality of parts and independently coding each part to obtain coded first CSI;

the transceiver is further configured to feed back the encoded first CSI on the first uplink channel resource allocated by the base station.

Wherein the transceiver is further configured to: receiving a second indication signaling;

the processor is further configured to perform the following process: integrally coding the second CSI to obtain coded second CSI; or dividing the second CSI into a plurality of parts and independently coding each part to obtain coded second CSI;

the transceiver is further configured to feed back the encoded second CSI on a second uplink channel resource allocated by the base station.

An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the feedback method for CSI as described above are implemented.

The embodiment of the present invention further provides a feedback apparatus for CSI, including:

the measurement module is used for measuring a target downlink channel and determining target CSI of the target downlink channel; the target CSI includes: a target Rank Indication (RI), a target Precoding Matrix Indication (PMI) and a target Channel Quality Indication (CQI);

a decomposition module for decomposing the target CSI into a first CSI and a second CSI; wherein the first CSI comprises: the method comprises the steps that a target RI, a first PMI formed by information required by constructing a precoding matrix with RI equal to 1 in the target PMI and a first CQI calculated according to the first PMI are obtained; the second CSI includes: the residual PMIs except the first PMI in the target PMI and the target CQI;

a first feedback module, configured to receive a first indication signaling and feed back the first CSI on a first uplink channel resource allocated by a base station; and/or the second feedback module is configured to receive a second indication signaling, and feed back the second CSI on a second uplink channel resource allocated by the base station.

An embodiment of the present invention further provides a base station, including: a transceiver, a memory, a processor and a computer program stored on the memory and executable on the processor, the processor being configured to read a program in the memory and perform the following processes:

the transceiver is configured to send a first indication signaling for indicating the terminal to feed back the first CSI to the terminal, and allocate the first uplink channel resource to the terminal.

Wherein the transceiver is further configured to: receiving first CSI fed back by a terminal on a first uplink channel resource;

the processor is further configured to perform the following process: and analyzing the first CSI and determining the value of the target RI contained in the first CSI.

Wherein the processor is further configured to perform the following process:

the transceiver is further configured to send a second indication signaling for indicating the terminal to feed back the second CSI to the terminal, and allocate the second uplink channel resource to the terminal.

Wherein the overhead of the second CSI comprises:

Wherein the processor is further configured to perform the following process:

The transceiver is further configured to receive second CSI fed back by the terminal on a second uplink channel resource;

the processor is further configured to perform the following process:

An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the resource allocation method described above are implemented.

An embodiment of the present invention further provides a resource allocation apparatus, including:

the first allocation module is used for allocating first uplink channel resources to the terminal according to the overhead of the channel state information CSI with the rank indication RI equal to 1; the first uplink channel resource is used for the terminal to feed back first CSI;

a first sending module, configured to send, to a terminal, a first indication signaling for indicating that the terminal feeds back the first CSI, and allocate the first uplink channel resource to the terminal.

The technical scheme of the invention at least has the following beneficial effects:

in the channel state information feedback and resource allocation method, the terminal, the base station and the device of the embodiment of the invention, the terminal decomposes the CSI information into the first CSI and the second CSI, wherein the cost of the first CSI is the same as the cost of the complete CSI with RI equal to 1, and the base station can allocate the first uplink channel resource for the first CSI based on the cost of the complete CSI with RI equal to 1 and allocate the second uplink channel resource for the second CSI based on the fed back first CSI, thereby ensuring the precision of CSI feedback and also ensuring the effective utilization of the uplink channel resources.

Drawings

Fig. 1 is a flowchart illustrating steps of a method for feeding back CSI according to an embodiment of the present invention;

FIG. 2 is a flowchart illustrating steps of a resource allocation method according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram illustrating a feedback apparatus for CSI according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a resource allocation apparatus according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, an embodiment of the present invention provides a method for feeding back channel state information CSI, including:

step 11, measuring a target downlink channel, and determining a target CSI of the target downlink channel; the target CSI includes: a target Rank Indication (RI), a target Precoding Matrix Indication (PMI) and a target Channel Quality Indication (CQI);

step 12, decomposing the target CSI into a first CSI and a second CSI; wherein the first CSI comprises: the method comprises the steps that a target RI, a first PMI formed by information required by constructing a precoding matrix with RI equal to 1 in the target PMI and a first CQI calculated according to the first PMI are obtained; the second CSI includes: the residual PMIs except the first PMI in the target PMI and the target CQI;

step 13, receiving a first indication signaling, and feeding back the first CSI on a first uplink channel resource allocated by the base station; and/or, step 14, receiving a second indication signaling, and feeding back the second CSI on a second uplink channel resource allocated by the base station.

In the above embodiments of the present invention, the overhead of the target CSI is different according to different values of the target RI, and the target CSI is decomposed into the first CSI and the second CSI in step 12, where the first CSI includes: the method comprises the steps of a target RI, a first PMI formed by information required by constructing a precoding matrix with RI equal to 1 in the target PMI and a first CQI calculated according to the first PMI. According to the content included in the first CSI, the overhead of the first CSI is the same as the overhead of the complete CSI when RI is 1; in short, this step 12 divides the target CSI into a first CSI with fixed overhead and a second CSI with dynamically varying overhead.

For example, if the overhead of the complete CSI is the overhead occupied by transmitting 235-bit information when RI is equal to 1, if the target CSI includes a target RI equal to 1, the first CSI is the target CSI, the overhead is the overhead occupied by transmitting 235-bit information, and the second CSI is empty (that is, the overhead of the second CSI is 0). For another example, if the target CSI includes a target RI of 2, the overhead of the first CSI is the overhead of transmitting 235-bit information, and the overhead of the second CSI is the overhead of transmitting 218-bit information. For another example, if the target CSI includes a target RI equal to 3, the overhead of the first CSI is still the overhead of transmitting 235 bits of information, and the overhead of the second CSI is the overhead of transmitting information larger than 218 bits (e.g., 250 bits, etc.), which is not limited herein.

The base station side knows the rule for the terminal to decompose CSI in advance, and the rule may be predetermined by the terminal and the base station, may be notified to the base station by the terminal, may be notified to the terminal by the rule specified by the base station, and is not limited specifically herein.

Since the base station side knows the rule of the terminal for decomposing the CSI in advance, the base station side can respectively allocate uplink channel resources to the first CSI and the second CSI, the first uplink channel resources allocated by the base station are matched with the overhead of the first CSI, and the second uplink channel resources allocated by the base station are matched with the overhead of the second CSI, so that the terminal feeds back the first CSI to the base station on the first uplink channel resources, and when the second CSI is fed back to the base station on the second uplink channel resources, the CSI feedback accuracy can be ensured, and the effective utilization of the uplink channel resources can also be ensured.

Further, in the above embodiments of the present invention, if the target CSI further includes: channel state information reference symbol resource indication, CRI; the first CSI further comprises: the channel state information reference symbol resource indicates CRI. Wherein, CRI's English is called: the CSI-RS Resource Indicator can also be referred to as CSI-RS Resource Indicator for short. In short, if the target CSI includes a CRI, the CRI is resolved into the first CSI.

Preferably, in the above embodiment of the present invention, when the target RI is equal to 1, the target CSI is the first CSI, and the second CSI is null.

It should be noted that, in the embodiment of the present invention, values of the target RI are different, and the target PMI is used as a target PMI, where a large change in overhead difference is obtained, and an influence of the target PMI on the overhead of the target RI and the overhead of the target CQI is small and may be ignored. Specifically, the target PMI includes: twiddle factor, beam selection, strongest coefficient of each layer, bandwidth amplitude of each layer, subband amplitude of each layer and subband phase of each layer;

Specifically, if the value of the target RI is 1, the number of layers included in the target PMI is 1, which is generally referred to as a first layer; if the value of the target RI is 2, the number of layers included in the target PMI is 2, which is generally referred to as a first layer and a second layer; if the value of the target RI is 3, the number of layers included in the target PMI is 3, which is generally referred to as a first layer, a second layer, and a third layer, and is not enumerated here.

For example, if the value of the target RI is 2, the target PMI includes: a twiddle factor, a beam selection, a strongest coefficient of the first layer, a strongest coefficient of the second layer, a bandwidth amplitude of the first layer, a bandwidth amplitude of the second layer, a subband amplitude of the first layer, a subband amplitude of the second layer, a subband phase of the first layer, and a subband phase of the second layer.

For another example, if the value of the target RI is 3, the target PMI includes: the method comprises the steps of rotation factor, beam selection, the strongest coefficient of a first layer, the strongest coefficient of a second layer, the strongest coefficient of a third layer, the bandwidth amplitude of the first layer, the bandwidth amplitude of the second layer, the bandwidth amplitude of the third layer, the subband amplitude of the first layer, the subband amplitude of the second layer, the subband amplitude of the third layer, the subband phase of the first layer, the subband phase of the second layer and the subband phase of the third layer.

Accordingly, in the above embodiments of the present invention, the first PMI configured by information required for constructing a precoding matrix whose RI is equal to 1 in the target PMI includes: the method comprises the steps of rotating factors, beam selection, the strongest coefficient of a first layer, the bandwidth amplitude of the first layer, the subband amplitude of the first layer and the subband phase of the first layer; wherein, the first layer represents the layer corresponding to the precoding matrix with RI equal to 1.

The remaining PMIs of the target PMIs except the first PMI include: the strongest coefficients of the remaining layers other than the first layer, the bandwidth amplitudes of the remaining layers other than the first layer, the subband amplitudes of the remaining layers other than the first layer, and the subband phases of the remaining layers other than the first layer.

Preferably, step 13 in the above embodiment of the present invention includes:

receiving a first indication signaling;

integrally coding the first CSI to obtain a coded first CSI; or dividing the first CSI into a plurality of parts and independently coding each part to obtain coded first CSI; for example, a combination of the target RI and the first CQI is independently encoded; independently encoding the bandwidth amplitude of the first layer; independently encoding combinations of the twiddle factors, the beam selection, the strongest coefficients of the first layer, the subband amplitudes of the first layer, and the subband phases of the first layer;

Preferably, step 14 in the above embodiment of the present invention includes:

receiving a second indication signaling;

integrally coding the second CSI to obtain coded second CSI; or dividing the second CSI into a plurality of parts and independently coding each part to obtain coded second CSI; for example, independently encoding the bandwidth amplitude of the remaining layers except the first layer; independently encoding a combination of the strongest coefficients of the remaining layers other than the first layer, the subband amplitudes of the remaining layers other than the first layer, and the subband phases of the remaining layers other than the first layer;

To sum up, in the feedback method for CSI provided in the embodiment of the present invention, the target CSI is decomposed into the first CSI and the second CSI, the base station can optionally trigger the reporting of the first CSI or the second CSI through the dynamic signaling, and allocates the corresponding uplink channel resource when the dynamic signaling is triggered, thereby implementing the effective allocation of the uplink resource and the accurate feedback of the CSI.

As shown in fig. 2, an embodiment of the present invention further provides a resource allocation method, including:

step 21, allocating a first uplink channel resource to the terminal according to the overhead of the channel state information CSI with the rank indication RI equal to 1; the first uplink channel resource is used for the terminal to feed back first CSI;

step 22, sending a first indication signaling for indicating the terminal to feed back the first CSI to the terminal, and allocating the first uplink channel resource to the terminal.

Since the base station side knows the rule of decomposing the CSI by the terminal in advance, the base station side can determine that the overhead of the first CSI is the same as the overhead of the complete CSI when RI is 1, and the base station side can allocate the first uplink channel resource to the terminal at the overhead of the complete CSI where the rank indication RI is 1, where the first uplink channel resource is actually matched with the overhead of the first CSI, so that effective allocation of the uplink resource and accurate feedback of the first CSI information can be achieved.

Further, after step 22 in the above embodiment of the present invention, the method further includes:

step 23, receiving a first CSI fed back by the terminal on the first uplink channel resource;

and 24, analyzing the first CSI, and determining the value of the target RI contained in the first CSI.

Because the first CSI includes a target RI, the base station can further determine whether the second CSI exists after determining the value of the target RI. For example, if the value of the target RI is equal to 1, the second CSI is empty, the terminal does not need to report the second CSI, and the base station does not need to allocate a second uplink channel resource; for another example, if the value of the target RI is equal to 2, at this time, the base station may calculate the overhead of the second CSI, allocate a second uplink channel resource to the second CSI, and notify the terminal to report the second CSI through the dynamic instruction.

Specifically, after step 24, the method further includes:

if the value of the target RI is greater than 1, acquiring the overhead of a second CSI; wherein the overhead of the second CSI comprises: a target precoding matrix corresponding to the target RI indicates the overhead of the rest PMIs except the first PMI in the PMI; wherein the first PMI is formed by information required for constructing a precoding matrix with RI equal to 1 in the target PMI; and an overhead of the target channel quality indication CQI corresponding to the target RI.

And after determining the overhead of the second CSI, the base station allocates a second uplink channel resource to the terminal according to the overhead of the second CSI, wherein the first uplink channel resource is actually matched with the overhead of the second CSI, so that the effective allocation of the uplink resource and the accurate feedback of the first CSI can be realized.

Further, in the foregoing embodiment of the present invention, after step 24, the method further includes:

if the value of the target RI is equal to 1, scheduling according to the first CSI; and if the value of the target RI is equal to 1, the first CSI is shown to be complete CSI, and scheduling can be directly carried out on the basis of the first CSI.

If the value of the target RI is greater than 1, modifying the target RI contained in the first CSI into 1, and scheduling according to the first CSI; if the value of the target RI is greater than 1, it indicates that the first CSI is not the optimal CSI, but the base station may also perform scheduling based on the first CSI, and at this time, the value of the target RI included in the first CSI needs to be modified to 1.

Further, after the step of sending a second indication signaling for indicating the terminal to feed back the second CSI to the terminal and allocating the second uplink channel resource to the terminal, the method further includes:

merging the first CSI and the second CSI, and scheduling according to the merged CSI; and after the first CSI and the second CSI are combined, complete CSI information is obtained, and the complete CSI information can be used for scheduling.

In summary, in the embodiments of the present invention, the terminal decomposes the CSI information into the first CSI and the second CSI, where the overhead of the first CSI is the same as the overhead of the complete CSI whose RI is equal to 1, and the base station may allocate the first uplink channel resource to the first CSI based on the overhead of the complete CSI whose RI is equal to 1, and allocate the second uplink channel resource to the second CSI based on the fed-back first CSI, so that the accuracy of CSI feedback can be ensured, and the effective utilization of the uplink channel resources can also be ensured.

In order to more clearly describe the feedback method of the CSI and the resource allocation method provided by the present application, the following description is made with reference to examples, tables 3 and 4:

table 332 PMI feedback overhead (wideband portion) for port type II codebook

TABLE 432 PMI feedback overhead (wideband portion) for Port type II codebooks

Example one

The PMI of the Type II codebook of the 5G air interface comprises the following contents: twiddle factor, beam selection, strongest coefficient per layer, wideband amplitude per layer, subband amplitude per layer, and subband phase per layer. The number of layers is the rank number, which is also the value of RI. Assume that the base station configures a 32-port type II codebook, and the codebook parameter L is 3, and the number of feedback subbands is 10. The system predefines an RI overhead of 3 bits. When rank is 1 or 2, there is only one codeword (codeword), and the CQI of each subband is 4 bits. It may be determined that the remaining PMI information includes a strongest coefficient of the second layer, a wideband amplitude of the second layer, a subband amplitude of the second layer, and a subband phase of the second layer. The second CSI information includes the remaining PMI information and CQI information when RI is 2.

A terminal:

and the terminal performs channel measurement and calculates CSI information to obtain RI-2. The complete CSI information obtained at this time includes: RI, PMI information (including twiddle factor, beam selection, strongest coefficient of the first layer, strongest coefficient of the second layer, wideband amplitude of the first layer, wideband amplitude of the second layer, subband amplitude of the first layer, subband amplitude of the second layer, subband phase of the first layer, and subband phase of the second layer), and CQI.

The terminal determines that the first PMI information comprises a rotation factor, beam selection, a strongest coefficient of the first layer, wideband amplitude of the first layer, subband amplitude of the first layer and subband phase of the first layer in the PMI. The terminal further calculates CQI information corresponding to the first PMI information, which is referred to as first CQI information, based on the first PMI information. When 10 subbands are fed back, it is determined from tables 3 and 4 that the first PMI information is 192 bits. The terminal takes the RI, the first PMI information and the first CQI information as first CSI information, which includes 3+192+ 40-235 bits; and taking the CQI information in the remaining PMI information and the full CSI information as second CSI information, which includes 178+ 40-218 bits.

And receiving a base station signaling indication, and feeding back the first CSI information on the first uplink channel resource by the terminal. The RI and the first CQI may form a part to be encoded, the wideband amplitude of the first layer may be independently encoded, and the twiddle factor, the beam selection, the strongest coefficient of the first layer, the subband amplitude of the first layer, and the subband phase of the first layer may form a part to be encoded. And/or receiving a base station signaling indication, and feeding back the second CSI information on the second uplink channel resource by the terminal. The wideband amplitude of the second layer can be encoded independently, and the strongest coefficient of the second layer, the subband amplitude of the second layer, and the subband phase and CQI of the second layer can be encoded as one part.

A base station:

as can be seen from tables 3 and 4, the PMI load overhead obtained by the base station when RI is 1 at this time is 192 bits. Considering 3 bits of overhead of RI and 40 bits of CQI overhead of 10 subbands, the complete CSI information when RI is 1 is RI + PMI + CQI 3+192+40 is 235 bits. The base station allocates a first uplink channel resource for the terminal according to the overhead occupied by the transmission of 235-bit information.

And the base station indicates the terminal to feed back the first CSI information through signaling, and allocates a first uplink channel resource.

And the base station receives the first CSI information fed back by the terminal. Decoding the information to obtain the RI-2 fed back by the terminal. Meanwhile, the base station may determine that the remaining PMI information is 178 bits, and the overhead of the second CSI information is 178+ 40-218 bits. The base station allocates the second uplink channel resource to the terminal according to the overhead occupied by transmitting 218 bits of information.

And the base station indicates the terminal to feed back the second CSI information through signaling, and allocates a second uplink channel resource.

And the base station receives the second CSI information fed back by the terminal, combines the second CSI information with the first CSI information, and obtains complete CSI information for scheduling.

Example two

The PMI of the Type II codebook of the 5G air interface comprises the following contents: twiddle factor, beam selection, strongest coefficient per layer, wideband amplitude per layer, subband amplitude per layer, and subband phase per layer. The number of layers is the rank number, which is also the value of RI. Assume that the base station configures a 32-port type II codebook, and the codebook parameter L is 3, and the number of feedback subbands is 10. The system predefines an RI overhead of 3 bits. When rank is 1 or 2, there is only one codeword, and the CQI of each subband is 4 bits. It may be determined that the remaining PMI information includes a strongest coefficient of the second layer, a wideband amplitude of the second layer, a subband amplitude of the second layer, and a subband phase of the second layer. The second CSI information includes the remaining PMI information and CQI information when RI is 2.

A terminal:

And receiving a base station signaling indication, and feeding back the first CSI information on the first uplink channel resource by the terminal. The RI and the first CQI may form a part to be encoded, the wideband amplitude of the first layer may be independently encoded, and the twiddle factor, the beam selection, the strongest coefficient of the first layer, the subband amplitude of the first layer, and the subband phase of the first layer may form a part to be encoded.

A base station:

from table 3 and table 4, the base station obtains a PMI load overhead of 192 bits when RI is 1. Considering 3 bits of overhead of RI and 40 bits of CQI overhead of 10 subbands, the complete CSI information when RI is 1 is RI + PMI + CQI 3+192+40 is 235 bits. The base station allocates a first uplink channel resource for the terminal according to the overhead occupied by the transmission of 235-bit information.

And the base station receives the first CSI information fed back by the terminal. Decoding the information to obtain the RI-2 fed back by the terminal. And the base station revises the RI in the first CSI information to 1 and then uses the revised RI as complete CSI information for scheduling.

Example three

The PMI of the Type II codebook of the 5G air interface comprises the following contents: twiddle factor, beam selection, strongest coefficient per layer, wideband amplitude per layer, subband amplitude per layer, and subband phase per layer. The number of layers is the rank number, and is also the RI value. Assume that the base station configures a 32-port type II codebook, and the codebook parameter L is 3, and the number of feedback subbands is 10. The system predefines an RI overhead of 3 bits. RI-1 corresponds to one codeword, and CQI of each subband is 4 bits; and RI 2 corresponds to two codewords, each subband includes two CQIs, the CQI1 corresponding to the first codeword is 4 bits, and the CQI2 corresponding to the second codeword is 3 bits. It may be determined that the remaining PMI information includes a strongest coefficient of the second layer, a wideband amplitude of the second layer, a subband amplitude of the second layer, and a subband phase of the second layer. The second CSI information includes CQI information (CQI1 and CQI2) corresponding to two codewords when the remaining PMI information corresponds to RI 2.

A terminal:

and the terminal performs channel measurement and calculates CSI information to obtain RI-2. The complete CSI information obtained at this time includes: RI, PMI information (including twiddle factor, beam selection, strongest coefficient of the first layer, strongest coefficient of the second layer, wideband amplitude of the first layer, wideband amplitude of the second layer, subband amplitude of the first layer, subband amplitude of the second layer, subband phase of the first layer, and subband phase of the second layer), and CQI (including CQI1 and CQI 2).

The terminal determines that the first PMI information comprises a rotation factor, beam selection, a strongest coefficient of the first layer, wideband amplitude of the first layer, subband amplitude of the first layer and subband phase of the first layer in the PMI. The terminal further calculates CQI information corresponding to the first PMI information, referred to as first CQI information, based on the first PMI information, where the first CQI corresponds to a CQI of one codeword and is 4 bits per subband. When 10 subbands are fed back, it is determined from tables 3 and 4 that the first PMI information is 192 bits. The terminal takes the RI, the first PMI information and the first CQI information as first CSI information, which includes 3+192+ 40-235 bits; the CQI information (including CQI1 and CQI2) among the remaining PMI information and the full CSI information is taken as second CSI information, which includes 178+ 70-248 bits.

And receiving the base station signaling indication, and feeding back the second CSI information on the second uplink channel resource by the terminal. Wherein the wideband amplitude of the second layer may be encoded independently and the strongest coefficient of the second layer, the subband amplitude of the second layer, and the subband phase and CQI (including CQI1 and CQI2) of the second layer may be encoded as one part.

A base station:

And the base station receives the first CSI information fed back by the terminal. Decoding the information to obtain the RI-2 fed back by the terminal. Meanwhile, the base station may determine that the remaining PMI information is 178 bits, and the overhead of the second CSI information is 178+ 70-248 bits. And the base station allocates a second uplink channel resource for the terminal according to the overhead occupied by the 248-bit information transmission.

And the base station receives the second CSI fed back by the terminal, combines the second CSI with the first CSI received in the step 3, and obtains complete CSI for scheduling.

In summary, in the embodiments of the present invention, the terminal decomposes the target CSI into the first CSI and the second CSI, the base station may optionally trigger the reporting of the first CSI or the second CSI through the dynamic signaling, and allocate corresponding uplink channel resources when the dynamic signaling is triggered; preferably, the base station may allocate a first uplink channel resource to the first CSI based on the overhead of the complete CSI with RI equal to 1, and allocate a second uplink channel resource to the second CSI based on the fed-back first CSI, thereby ensuring both the accuracy of CSI feedback and the effective utilization of the uplink channel resources.

As shown in fig. 3, an embodiment of the present invention further provides a terminal, including: a transceiver 320, a memory 310, a processor 300, a user interface 330 and a computer program stored on the memory 310 and executable on the processor 300; the processor 300 is configured to read a program in a memory, and execute the following processes:

the transceiver 320 is configured to receive a first indication signaling, and feed back the first CSI on a first uplink channel resource allocated by a base station; and/or receiving a second indication signaling, and feeding back the second CSI on a second uplink channel resource allocated by the base station.

Preferably, in the above embodiment of the present invention, if the target CSI further includes: channel state information reference symbol resource indication, CRI;

Preferably, in the above embodiment of the present invention, the target PMI includes: twiddle factor, beam selection, strongest coefficient of each layer, bandwidth amplitude of each layer, subband amplitude of each layer and subband phase of each layer;

Preferably, in the above embodiment of the present invention, the first PMI includes: the method comprises the steps of rotating factors, beam selection, the strongest coefficient of a first layer, the bandwidth amplitude of the first layer, the subband amplitude of the first layer and the subband phase of the first layer;

Preferably, the transceiver 320 in the above embodiment of the present invention is further configured to: receiving a first indication signaling;

the processor 300 is further configured to perform the following process: integrally coding the first CSI to obtain a coded first CSI; or dividing the first CSI into a plurality of parts and independently coding each part to obtain coded first CSI;

the transceiver 320 is further configured to feed back the encoded first CSI on the first uplink channel resource allocated by the base station.

Preferably, in the above embodiments of the present invention, the transceiver 320 is further configured to: receiving a second indication signaling;

the processor 300 is further configured to perform the following process: integrally coding the second CSI to obtain coded second CSI; or dividing the second CSI into a plurality of parts and independently coding each part to obtain coded second CSI;

the transceiver 320 is further configured to feed back the encoded second CSI on the second uplink channel resource allocated by the base station.

It should be noted that, the terminal provided in the embodiments of the present invention is a terminal capable of executing the above feedback method of channel state information, and all embodiments of the above feedback method of channel state information are applicable to the terminal, and can achieve the same or similar beneficial effects.

An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process in the above-described embodiment of the method for feeding back CSI, and can achieve the same technical effect, and is not described herein again to avoid repetition. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

As shown in fig. 4, an embodiment of the present invention further provides a device for feeding back channel state information CSI, including:

a measurement module 41, configured to measure a target downlink channel and determine a target CSI of the target downlink channel; the target CSI includes: a target Rank Indication (RI), a target Precoding Matrix Indication (PMI) and a target Channel Quality Indication (CQI);

a decomposition module 42 configured to decompose the target CSI into a first CSI and a second CSI; wherein the first CSI comprises: the method comprises the steps that a target RI, a first PMI formed by information required by constructing a precoding matrix with RI equal to 1 in the target PMI and a first CQI calculated according to the first PMI are obtained; the second CSI includes: the residual PMIs except the first PMI in the target PMI and the target CQI;

a first feedback module 43, configured to receive the first indication signaling, and feed back the first CSI on the first uplink channel resource allocated by the base station; and/or the second feedback module 44 is configured to receive the second indication signaling, and feed back the second CSI on the second uplink channel resource allocated by the base station.

Preferably, if the target CSI further comprises: channel state information reference symbol resource indication, CRI;

Preferably, when the target RI is equal to 1, the target CSI is the first CSI, and the second CSI is null.

Preferably, the target PMI includes: twiddle factor, beam selection, strongest coefficient of each layer, bandwidth amplitude of each layer, subband amplitude of each layer and subband phase of each layer;

Preferably, the first PMI comprises: the method comprises the steps of rotating factors, beam selection, the strongest coefficient of a first layer, the bandwidth amplitude of the first layer, the subband amplitude of the first layer and the subband phase of the first layer;

Preferably, the first feedback module 43 comprises:

the first receiving submodule is used for receiving a first indication signaling;

the first coding submodule is used for carrying out integral coding on the first CSI to obtain a coded first CSI; or dividing the first CSI into a plurality of parts and independently coding each part to obtain coded first CSI;

and the first feedback submodule is used for feeding back the coded first CSI on the first uplink channel resource allocated by the base station.

Preferably, the second feedback module 44 includes:

the second receiving submodule is used for receiving a second indication signaling;

the second coding submodule is used for carrying out integral coding on the second CSI to obtain coded second CSI; or dividing the second CSI into a plurality of parts and independently coding each part to obtain coded second CSI;

and the second feedback submodule is used for feeding back the coded second CSI on the second uplink channel resource allocated by the base station.

As shown in fig. 5, an embodiment of the present invention further provides a base station, including: transceiver 520, memory 510, processor 500 and computer program stored on the memory 510 and executable on the processor 500 is configured to read a program in memory, perform the following process:

the transceiver 520 is configured to send a first indication signaling for indicating the terminal to feed back the first CSI, and allocate the first uplink channel resource to the terminal.

Preferably, in the above embodiments of the present invention, the transceiver 520 is further configured to: receiving first CSI fed back by a terminal on a first uplink channel resource;

the processor 500 is further configured to perform the following process: and analyzing the first CSI and determining the value of the target RI contained in the first CSI.

The processor 500 in the above embodiment of the present invention is further configured to perform the following processes:

The overhead of the second CSI in the above embodiments of the present invention includes:

In the above embodiment of the present invention, the transceiver 520 is further configured to receive a second CSI fed back by the terminal on a second uplink channel resource;

the processor is further configured to perform the following process:

It should be noted that, the base station provided in the embodiments of the present invention is a base station capable of executing the resource allocation method, and all embodiments of the resource allocation method are applicable to the base station and can achieve the same or similar beneficial effects.

An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process in the foregoing resource allocation method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

As shown in fig. 6, an embodiment of the present invention further provides a resource allocation apparatus, including:

a first allocating module 61, configured to allocate a first uplink channel resource to the terminal according to the overhead of the channel state information CSI with the rank indication RI equal to 1; the first uplink channel resource is used for the terminal to feed back first CSI;

a first sending module 62, configured to send a first indication signaling for indicating the terminal to feed back the first CSI to the terminal, and allocate the first uplink channel resource to the terminal.

Preferably, in the embodiment of the present invention, the base station further includes:

a first receiving module, configured to receive a first CSI fed back by a terminal on a first uplink channel resource;

and the first analysis module is used for analyzing the first CSI and determining the value of the target RI contained in the first CSI.

an obtaining module, configured to obtain an overhead of a second CSI if a value of the target RI is greater than 1;

a second allocating module, configured to allocate a second uplink channel resource to the terminal according to the overhead of the second CSI; the second uplink channel resource is used for the terminal to feed back second CSI;

and a second sending module, configured to send, to a terminal, a second indication signaling for indicating that the terminal feeds back the second CSI, and allocate the second uplink channel resource to the terminal.

Preferably, the overhead of the second CSI in the embodiment of the present invention includes:

a first scheduling module, configured to perform scheduling according to the first CSI if the value of the target RI is equal to 1;

and the second scheduling module is used for modifying the target RI contained in the first CSI into 1 if the value of the target RI is greater than 1, and performing scheduling according to the first CSI.

a second receiving module, configured to receive a second CSI fed back by the terminal on a second uplink channel resource;

and the third scheduling module is used for combining the first CSI and the second CSI and scheduling according to the combined CSI.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-readable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block or blocks.

These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for feeding back Channel State Information (CSI), comprising:

receiving a first indication signaling, and feeding back the first CSI on a first uplink channel resource allocated by a base station; and/or receiving a second indication signaling, and feeding back the second CSI on a second uplink channel resource allocated by the base station;

receiving a first indication signaling;

feeding back the coded first CSI on a first uplink channel resource allocated by the base station;

receiving a second indication signaling;

2. The feedback method of claim 1, wherein if the target CSI further comprises: channel state information reference symbol resource indication, CRI;

3. The feedback method of claim 1, wherein the target CSI is the first CSI and the second CSI is null when the target RI is equal to 1.

4. The feedback method of claim 1, wherein the target PMI comprises: twiddle factor, beam selection, strongest coefficient of each layer, bandwidth amplitude of each layer, subband amplitude of each layer and subband phase of each layer;

5. The feedback method of claim 4, wherein the first PMI comprises: the method comprises the steps of rotating factors, beam selection, the strongest coefficient of a first layer, the bandwidth amplitude of the first layer, the subband amplitude of the first layer and the subband phase of the first layer;

6. A method for resource allocation, comprising:

sending a first indication signaling for indicating the terminal to feed back the first CSI to the terminal, and allocating the first uplink channel resource to the terminal;

receiving first CSI fed back by a terminal on a first uplink channel resource;

analyzing the first CSI, and determining the value of a target RI contained in the first CSI;

sending a second indication signaling for indicating the terminal to feed back the second CSI to the terminal, and allocating the second uplink channel resource to the terminal;

7. The method of claim 6, wherein the overhead of the second CSI comprises:

8. The method of claim 6, wherein after the step of analyzing the first CSI and determining a value of a target RI included in the first CSI, the method further comprises:

9. A terminal, comprising: a transceiver, a memory, a processor, and a computer program stored on the memory and executable on the processor; wherein the processor is configured to read a program in the memory and execute the following processes:

the transceiver is used for receiving a first indication signaling and feeding back the first CSI on a first uplink channel resource allocated by a base station; and/or receiving a second indication signaling, and feeding back the second CSI on a second uplink channel resource allocated by the base station;

the transceiver is further configured to: receiving a first indication signaling;

the transceiver is further configured to feed back the coded first CSI on the first uplink channel resource allocated by the base station;

the transceiver is further configured to: receiving a second indication signaling;

10. The terminal of claim 9, wherein if the target CSI further comprises: channel state information reference symbol resource indication, CRI;

11. The terminal of claim 9, wherein the target CSI is the first CSI and the second CSI is null when the target RI is equal to 1.

12. The terminal of claim 9, wherein the target PMI comprises: twiddle factor, beam selection, strongest coefficient of each layer, bandwidth amplitude of each layer, subband amplitude of each layer and subband phase of each layer;

13. The terminal of claim 12, wherein the first PMI comprises: the method comprises the steps of rotating factors, beam selection, the strongest coefficient of a first layer, the bandwidth amplitude of the first layer, the subband amplitude of the first layer and the subband phase of the first layer;

14. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the feedback method of channel state information, CSI, according to any one of claims 1 to 5.

15. A device for feeding back channel state information CSI, comprising:

a first feedback module, configured to receive a first indication signaling and feed back the first CSI on a first uplink channel resource allocated by a base station; and/or the second feedback module is configured to receive a second indication signaling, and feed back the second CSI on a second uplink channel resource allocated by the base station;

wherein the first feedback module comprises:

the first feedback submodule is used for feeding back the coded first CSI on the first uplink channel resource allocated by the base station;

wherein the second feedback module comprises:

16. A base station, comprising: a transceiver, a memory, a processor, and a computer program stored on the memory and executable on the processor; wherein the processor is configured to read a program in the memory and execute the following processes:

the transceiver is configured to send a first indication signaling for indicating the terminal to feed back the first CSI to the terminal, and allocate the first uplink channel resource to the terminal;

the processor is further configured to perform the following process: analyzing the first CSI, and determining the value of a target RI contained in the first CSI;

wherein the processor is further configured to perform the following process:

the transceiver is further configured to send a second indication signaling for indicating the terminal to feed back the second CSI to the terminal, and allocate the second uplink channel resource to the terminal;

the processor is further configured to perform the following process:

17. The base station of claim 16, wherein the overhead of the second CSI comprises:

18. The base station of claim 16, wherein the processor is further configured to perform the following process:

19. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of the resource allocation method according to any one of claims 6 to 8.

20. A resource allocation apparatus, comprising:

a first sending module, configured to send a first indication signaling for indicating the terminal to feed back the first CSI to the terminal, and allocate the first uplink channel resource to the terminal;

wherein the resource allocation apparatus further comprises:

the first analysis module is used for analyzing the first CSI and determining a value of a target RI contained in the first CSI;

the resource allocation apparatus further includes:

a second sending module, configured to send a second indication signaling for indicating the terminal to feed back the second CSI to the terminal, and allocate the second uplink channel resource to the terminal;

the resource allocation apparatus further includes: