WO2017193278A1

WO2017193278A1 - Configuration method for csi-rs, feedback method and device for csi, and communication system

Info

Publication number: WO2017193278A1
Application number: PCT/CN2016/081541
Authority: WO
Inventors: 郤伟; 周华
Original assignee: 富士通株式会社; 郤伟; 周华
Priority date: 2016-05-10
Filing date: 2016-05-10
Publication date: 2017-11-16

Abstract

A configuration method for a CSI-RS, a feedback method and device for CSI, and a communication system. In the configuration method, a relevance is introduced into a CSI-RS configuration for beam selection, that is, dividing selectable beams into several groups. CSI-RS configurations corresponding to the beams in the same group are related to each other. Once a CSI-RS configuration is notified by means of signalling, a user equipment can indirectly arrive at CSI-RS configurations corresponding to other beams in the group. Thus, the signalling overhead for notifying a CSI-RS configuration can be greatly reduced.

Description

CSI-RS configuration method, CSI feedback method, device and communication system

Technical field

The present invention relates to the field of communications, and in particular, to a CSI-RS configuration method, a CSI feedback method, a device, and a communication system.

Background technique

As we all know, the existing wireless spectrum is already crowded. In order to cope with the ever-increasing wireless traffic and the emerging new services, people have to explore wireless spectrum resources with higher frequency and higher bandwidth, such as centimeter wave and millimeter wave. However, the higher the frequency, the greater the attenuation. In order to overcome severe transmission loss, a large number of antennas, that is, large-scale antenna arrays, can be deployed at the transmitting end and the receiving end of the high-frequency communication link. This results in a larger beamforming gain against severe transmission attenuation.

Although the usual digital domain beamforming technology has higher precision and greater flexibility, it is not feasible to configure one RF link for each antenna element considering the cost and power consumption of the RF link. On the other hand, analog domain beamforming is less accurate and less flexible. Taken together, a compromise is to configure a limited number of RF links for large-scale antenna arrays. In this way, beamforming requires analog domain beamforming at the RF front end combined with digital domain beamforming at the baseband back end, ie hybrid beamforming.

In order to achieve a large beamforming gain, a closed loop beamforming scheme is typically employed. To this end, the receiving end needs to feed back the side information of the channel link to the transmitting end. For a wireless cellular system, the user equipment needs to feed back channel state information (CSI) to the base station. Especially for large-scale antenna arrays using hybrid beamforming technology, CSI feedback is more important.

In the existing multi-antenna system, the user equipment feeds back channel quality information and spatial information to the base station. Regarding spatial information feedback, there are currently two mechanisms: feedback based on precoding matrix indicator (PMI) and feedback based on beam selection, respectively corresponding to the 3rd Generation Partnership Project (3GPP). ) Type A (class A) and type B (class B) in the term. In the PMI-based feedback mechanism, the user equipment first estimates the complete channel matrix according to the reference signal, and then finds the codeword that matches it best in the predefined codebook, and feeds back the codeword number (ie, PMI) to the base station. . In a feedback mechanism based on beam selection, a base station configures different beamforming vectors for different antenna ports or different resources of a channel state information reference signal (CSI-RS). Precoded. The user equipment measures the different antenna ports or different resource configurations according to the configuration of the reference signal, and the antenna port or resource configuration number that maximizes the measured signal strength, that is, the channel state information reference signal resource indication (CRI, CSI-RS Resource Indicator) ) Feedback to the base station. Thereby, the base station obtains an optimal beamforming vector of the user equipment.

It should be noted that the above description of the technical background is only for the purpose of facilitating a clear and complete description of the technical solutions of the present invention, and is convenient for understanding by those skilled in the art. The above technical solutions are not considered to be well known to those skilled in the art simply because these aspects are set forth in the background section of the present invention.

Summary of the invention

However, the inventors have found that existing CSI configurations and feedback schemes have many problems and do not meet the needs of hybrid beamforming systems. Such as:

1) In hybrid beamforming, beam selection includes two stages of analog beam selection and digital beam selection. According to the current CSI-RS configuration method, beam selection in hybrid beamforming is bound to generate a large number of CSI processes. At the same time, it also causes a large amount of CSI-RS configuration signaling overhead and CSI feedback overhead.

2) According to the existing beam selection scheme, each user equipment feeds back only one CRI for one CSI process. If two user equipments do not select the same analog beam in the analog beam selection phase, the two user equipments cannot perform multiuser multiple input multiple output (MU-MIMO) transmission. In fact, if two user equipments select two spatially adjacent analog beams in the analog beam selection phase, it is still beneficial to perform MU-MIMO transmission on the two user equipments. In other words, the user equipment only feeds back one CRI for one CSI process, which limits the probability of MU-MIMO transmission, and thus reduces the efficiency of spectrum usage.

In order to solve the problem that the existing CSI configuration and the feedback solution cannot meet the requirements of the hybrid beamforming system, the embodiment of the present invention provides a CSI-RS configuration method, a CSI feedback method, a device, and a communication system.

According to a first aspect of the present invention, a method for configuring a channel state information reference signal is provided, which is applied to a base station, where the method includes:

The base station sends a configuration of a channel state information reference signal for one beam to the user equipment by using configuration signaling, where the one beam is included in one beam group, and the channel state information reference signal corresponding to the beam in the one beam group The configuration is related to each other.

According to a second aspect of the present invention, a method for feeding back channel state information is provided, which is applied to a user equipment, where the method includes:

The user equipment receives, by the base station, a configuration of a channel state information reference signal for one beam, where the one beam is included in one beam group, and the channel state information reference signals corresponding to the beams in the one beam group are configured to each other Related

Determining, by the user equipment, a configuration of a channel state information reference signal of other beams in the beam group in which the beam is located according to a configuration of a channel state information reference signal of the one beam;

The user equipment feeds back channel state information to the base station according to a configuration of a channel state information reference signal of each beam in the beam group.

According to a third aspect of the present invention, a device for configuring a channel state information reference signal is provided in a base station, where the device includes:

a configuration unit, configured to send, by using configuration signaling, a configuration of a channel state information reference signal for a beam, where the one beam is included in one beam group, and the channel state information reference corresponding to the beam in the one beam group The configuration of the signals is related to each other.

According to a fourth aspect of the present invention, a device for providing channel state information is provided in a user equipment, where the device includes:

a receiving unit, configured to receive, by the base station, a configuration of a channel state information reference signal for one beam, where the one beam is included in one beam group, and the channel state information reference signals corresponding to the beams in the one beam group are configured to each other Related

a determining unit, configured to determine a configuration of a channel state information reference signal of other beams in the beam group in which the beam is located according to a configuration of a channel state information reference signal of the one beam;

And a feedback unit that feeds back channel state information to the base station according to a configuration of a channel state information reference signal of each beam in the beam group.

According to a fifth aspect of the embodiments of the present invention, there is provided a base station, wherein the base station comprises the apparatus of the foregoing third aspect.

According to a sixth aspect of the embodiments of the present invention, a user equipment is provided, wherein the user equipment comprises the user equipment according to the foregoing fourth aspect.

According to a seventh aspect of the embodiments of the present invention, a communication system is provided, where the communication system includes a base station and a user equipment, where

The base station is configured to: send, by using configuration signaling, a configuration of a channel state information reference signal for one beam to the user equipment, where the one beam is included in one beam group, and the beam in the one beam group corresponds to The configuration of the channel state information reference signals are related to each other;

The user equipment is configured to: receive a configuration of a channel state information reference signal of the beam, and determine a configuration of a channel state information reference signal of other beams in the beam group where the beam is located, according to each beam in the beam group The channel state information reference signal is configured to feed back channel state information to the base station.

The beneficial effects of the embodiments of the present invention are as follows: the method, the device, or the system in the embodiment of the present invention, the CSI-RS configuration signaling overhead and the feedback overhead can be greatly reduced, the MU-MIMO transmission probability is increased, and the base station side has the channel quality. The accuracy of the compensation (CQI, Channel Quality Indicator) is improved, and the efficiency of the spectrum can be effectively improved.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and the drawings, in which <RTIgt; It should be understood that the embodiments of the invention are not limited in scope. The embodiments of the present invention include many variations, modifications, and equivalents within the scope of the appended claims.

Features described and/or illustrated with respect to one embodiment may be used in one or more other embodiments in the same or similar manner, in combination with, or in place of, features in other embodiments. .

It should be emphasized that the term "comprising" or "comprises" or "comprising" or "comprising" or "comprising" or "comprising" or "comprises"

DRAWINGS

The elements and features described in one of the figures or one embodiment of the embodiments of the invention may be combined with the elements and features illustrated in one or more other figures or embodiments. In the accompanying drawings, like reference numerals refer to the

The accompanying drawings are included to provide a further understanding of the embodiments of the invention Obviously, the drawings in the following description are only some of the embodiments of the present invention, and those skilled in the art can obtain other drawings according to the drawings without any inventive labor. In the drawing:

1 is a schematic diagram of a large-scale antenna array using hybrid beamforming techniques;

2 is a schematic diagram of a method of configuring a channel state information reference signal of Embodiment 1;

Figure 3 is a schematic diagram of a beam when n = 1;

4 is a schematic diagram of a beam when the analog beamforming vectors are the same when n=2;

Figure 5 is a schematic illustration of a set of beams having the same axial direction but different digital beamforming dimensions;

6 is a schematic diagram of a feedback method of channel state information of Embodiment 2;

7 is a schematic diagram of a configuration apparatus of a channel state information reference signal of Embodiment 3;

8 is a schematic diagram showing the system configuration of a base station according to Embodiment 3;

9 is a schematic diagram of a feedback device for channel state information of Embodiment 4;

10 is a schematic diagram showing the system configuration of a user equipment of Embodiment 4;

11 is a schematic diagram of a communication system of Embodiment 5.

detailed description

The foregoing and other features of the present invention will be apparent from the The specific embodiments of the present invention are disclosed in the specification and the drawings, which are illustrated in the embodiment of the invention The invention includes all modifications, variations and equivalents falling within the scope of the appended claims. Various embodiments of the present invention will be described below with reference to the accompanying drawings. These embodiments are merely exemplary and are not limiting of the invention.

In the present application, a base station may be referred to as an access point, a broadcast transmitter, a Node B, an evolved Node B (eNB), etc., and may include some or all of their functions. The term "base station" will be used herein. Each base station provides communication coverage for a particular geographic area.

In this application, a mobile station or device may be referred to as a "user equipment" (UE). A UE may be fixed or mobile and may also be referred to as a mobile station, terminal, access terminal, subscriber unit, station, and the like. The UE may be a cellular telephone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless telephone, a car, and the like.

As mentioned before, the existing CSI configuration and feedback scheme cannot meet the requirements of the hybrid beamforming system. To this end, the embodiment of the present invention proposes a new CSI configuration and feedback method for the hybrid beamforming system. According to the solution, the CSI-RS configuration signaling overhead and the feedback overhead can be greatly reduced, the MU-MIMO transmission probability is increased, and the accuracy of the CQI compensation and prediction is improved by the base station side, thereby effectively improving the spectrum usage efficiency. .

For convenience of description, in the embodiment of the present invention, a large-scale antenna array employing hybrid beamforming technology is configured, which is configured with N _d radio frequency links, each of which connects and controls N _a antenna elements. The analog beamforming vector of an RF link is recorded as

Where C _a is a predefined analog beamforming codebook. For digital beamforming, digital beamforming vectors can have different dimensions, given the flexible mapping of antenna ports and RF links. Here, "dimension" refers to the number of radio links corresponding to one antenna port, that is, the number of radio links participating in forming one beam. For n-dimensional digital beamforming, the beamforming vector can be expressed as

among them,

The codebook used for n-dimensional digital beamforming, n = 1, ..., N _d . Codebook size is

In particular, one-dimensional digital beamforming (n = 1) refers to the case where one antenna port corresponds to one radio frequency link. In this case, hybrid beamforming has actually degenerated into pure analog beamforming.

1 is a schematic diagram of a large-scale antenna array using hybrid beamforming technology. As shown in FIG. 1, in this example, four RF links are configured for one antenna port (AP), that is, N _d = 4 The dimension of digital beamforming is 4, and each RF link connects and controls five antenna elements, that is, N _a = 5.

The embodiments of the present invention will be described below with reference to the accompanying drawings.

Example 1

The present embodiment provides a method for configuring a channel state information reference signal (CSI-RS), which is applied to a base station, and FIG. 2 is a schematic diagram of the method in this embodiment. As shown in FIG. 2, the method includes:

Step 201: The base station sends a configuration of a channel state information reference signal for one beam to the user equipment by using configuration signaling, where the one beam is included in one beam group, and the channel state information corresponding to the beam in the one beam group is referenced. The configuration of the signals is related to each other.

In this embodiment, the user equipment may be, for example, the terminal of the hybrid beamforming system, but the invention is not limited thereto. For example, the user equipment may also be a terminal of another network system. The embodiment of the present invention is only described by taking a hybrid beamforming system as an example, but is not limited thereto, and can be applied to any system that performs channel state information reference signal (CSI-RS) configuration.

In this embodiment, the base station may be a macro base station (for example, an eNB), and the user equipment is served by a macro cell (for example, a macro cell) generated by the macro base station. The base station in the embodiment of the present invention may also be a micro base station, where the user equipment is used by the user equipment. A microcell generated by the micro base station (for example, a Pico cell) provides a service. The embodiment of the present invention is not limited thereto, and a specific scenario may be determined according to actual needs.

In this embodiment, the selectable beams are divided into groups, and the configurations of the CSI-RSs corresponding to the beams in the same group are related to each other. As long as the configuration of one CSI-RS is notified by signaling, the user equipment can indirectly The configuration of the CSI-RS corresponding to other beams in the group is derived, so that the signaling overhead of notifying the configuration of the CSI-RS can be greatly reduced.

In this embodiment, the beam is characterized by a beamforming vector. Therefore, the grouping of beams is also a grouping of beamforming vectors, which can be configured statically or semi-statically, or can be preset, for example, when the device is shipped from the factory. The preset is good, and the embodiment is not limited thereto. Therefore, in this embodiment, as shown in FIG. 2, the method further includes:

Step 200: The base station divides all available beams into multiple beam groups, and configurations of channel state information reference signals corresponding to beams in each beam group are related to each other.

In an embodiment of the present embodiment, the beams satisfying the following conditions are divided into the same beam group: the beam axis directions are different, the analog beamforming vectors may be the same or different; and the dimensions of the digital beamforming are the same. That is, in this embodiment, the beam in each beam group satisfies the above conditions.

For example, the available beams can be divided into N _d groups according to the dimensions of digital beamforming, and the nth group is composed of vectors with digital beamforming dimension n, namely:

Where G _n is a set of beam vectors in the nth beam group,

For digital beamforming vectors, w _a,j are analog beamforming vectors,

For the Kronecker product,

For the digital beamforming codebook, c _a is the analog beamforming codebook, i and j are the numbers of the digital beamforming vector and the analog beamforming vector in the respective codebooks, n is the digital beamforming dimension, and N _d is the RF chain. The number of roads.

3 is a schematic diagram of a beam when n=1, as shown in FIG. 3, when n=1, G ₁ =C _a is the analog beamforming codebook itself, and the hybrid beamforming is degraded into analog beamforming, and analog beamforming is performed. Each of the analog beamforming vectors in the codebook forms a beam. The analog beamforming codebook includes five analog shaping vectors as an example. A total of five beams are formed. The axes of the beams are different, but the dimensions of the digital beamforming are n. The same, therefore, the five beams can be divided into the same beam group.

4 is a schematic diagram of a beam when the analog beamforming vectors are the same when n=2. As shown in FIG. 4, when n=2, the beam formed by the hybrid beamforming is narrower than the beam formed by the analog beamforming, but Still in the envelope of the analog beam, but due to the increase in power, the actual beam is beyond the envelope of the analog beam, and will not be described here. As shown in FIG. 4, in this embodiment, the beam directions formed by the hybrid beamforming are different, but the dimensions of the digital beamforming are the same, and therefore, the beams can be divided into the same beam group. Figure 4 shows only the beam when the analog beamforming vectors are the same, for analog beamforming. The beams with different vectors can be divided into the same beam group because they satisfy the same direction of the axis and the digital beamforming dimensions are the same.

The beam grouping of the embodiment is described by taking n=1 and n=2 as an example. The case where n is another value is similar to this and will not be described again.

In another embodiment of the present embodiment, beams that satisfy the following conditions are divided into the same beam group: the beam axis directions are the same, the analog beamforming vectors are the same; and the dimensions of the digital beamforming are different. That is, in this embodiment, the beam in each beam group satisfies the above conditions.

In this embodiment, depending on the direction of the beam axis, the available beams can be divided into |C _a |·C groups, for example:

Wherein, G _i,j is a beam set having the same beam axis as the axis of the beam determined by the j-th codeword in the analog beamforming codebook and the i-th codeword in the n-dimensional digital beamforming codebook.

For digital beamforming vectors, w _a,j are analog beamforming vectors,

For the Kronecker product,

FIG. 5 is an example of a beam packet of the present embodiment. As shown in FIG. 5, in this embodiment, beams having the same axis but different dimensions are divided into the same beam group.

In this embodiment, each of the available beams needs to be equipped with a CSI-RS port or resource. The beam-based grouping also needs to be grouped by the CSI-RS. Therefore, each beam group corresponds to a group. a configuration of the channel state information reference signal, for example, the configuration of the set of channel state information reference signals may be a group of ports corresponding to one or more channel state information reference signal resources, the set of ports being related to each other; The configuration of the set of channel state information reference signals may also be one or more ports corresponding to a group of CSI-RS resources, and the set of CSI-RS resources have a correlation with each other.

Thus, in each beam group, the configurations of the channel state information reference signals corresponding to the respective beams are related to each other. The base station only needs to notify the configuration of the CSI-RS of one beam by signaling, and the user equipment can derive the configuration of the CSI-RS corresponding to other beams in the beam group where the beam is located according to the law. In other words, the base station can use the lowest The signaling overhead is used to inform the user equipment of the configuration of the CSI-RS of a set of beams.

Through the method of this embodiment, the CSI-RS configuration signaling overhead is reduced.

Example 2

The present embodiment provides a channel state information (CSI) feedback method, which is applied to a user equipment, and is a user equipment side processing corresponding to the method of Embodiment 1, wherein the same content as Embodiment 1 is no longer used. Repeat the instructions.

FIG. 6 is a schematic diagram of an embodiment of the method of this embodiment. As shown in FIG. 6, the method includes:

Step 601: The user equipment receives, by the base station, a configuration of a channel state information reference signal for one beam, where the one beam is included in one beam group, and the channel state information reference signal corresponding to the beam in the one beam group is configured. Related to each other;

Step 602: The user equipment determines, according to the configuration of the channel state information reference signal of the one beam, a configuration of a channel state information reference signal of other beams in the beam group where the beam is located.

Step 603: The user equipment feeds back channel state information to the base station according to a configuration of a channel state information reference signal of each beam in the beam group.

In this embodiment, the manner and strategy for beam grouping have been described in Embodiment 1, and the contents thereof are incorporated herein, and details are not described herein again.

In this embodiment, as described above, since the configurations of the CSI-RSs belonging to the beams in the same beam group have correlation, the user equipment can derive the beam according to the configuration of the CSI-RS transmitted by the base station for one beam. The CSI-RS configuration of other beams in the beam group is located, and channel measurement is performed accordingly, and then the corresponding CSI is fed back to the base station, which saves CSI configuration signaling overhead and feedback overhead.

In step 603, the user equipment may perform channel measurement according to the configuration of the CSI-RS of each beam, and feed back corresponding measurement results to the base station by using the channel state information reference signal. This embodiment does not limit the manner and feedback mode of the channel measurement, and may refer to the prior art.

In this embodiment, the channel state information is corresponding to each CSI process.

In an embodiment of this embodiment, the channel state information may include two or more channel state information reference signal resource indications (CRIs) corresponding to each CSI process in addition to the conventional content.

In the present embodiment, in the hybrid beamforming system, there are two cases when performing MU-MIMO transmission, and the analog beamforming vectors are the same or different. The two use digital beamforming and analog beamforming to distinguish users. For the latter, the paired user equipment must have better spatial isolation to ensure that the two can be easily distinguished in the spatial dimension. For example, the optimal analog beam selected by two user equipments is two spatially adjacent analog beams. Moreover, the sub-optimal analog beam of one of the user equipments is the optimal analog beam of the other user equipment. Display However, from the perspective of spectrum efficiency, the two user equipments should perform MU-MIMO transmission. However, according to the existing CSI feedback mechanism, that is, a user equipment feeds back only one CRI for a CSI process, the base station has no way to know that the two user equipments have selected different optimal analog beams, but both are in space. The dimensions are so close. As long as the optimal analog beams selected by the two user equipments are different, there is no opportunity for MU-MIMO transmission. Obviously, the existing CSI feedback mechanism limits MU-MIMO transmission and reduces the efficiency of spectrum usage. With this embodiment, one user equipment feeds back two or more CRIs for one CSI process, thereby increasing the probability of MU-MIMO transmission.

In another implementation manner of this embodiment, the channel state information may further include a channel quality indicator (CQI) corresponding to each CSI process and a dimension of digital beamforming corresponding to the CQI.

In this embodiment, digital beamforming with different dimensions is adopted, and the user equipment obtains different CQIs. If only one CQI is fed back, the base station cannot know the dimension of the digital beamforming corresponding to the CQI, thereby causing confusion. Moreover, the base station may make an error when predicting the CQI that can be achieved by the actual transmission based on the CQI fed back by the user. In order to avoid the occurrence of this situation, in the embodiment, when the user equipment feeds back the CSI, in addition to the CQI, the user equipment additionally feeds back the digital beamforming dimension corresponding to the CQI, thereby improving the compensation and prediction of the CQI by the base station. The accuracy of the spectrum effectively improves the efficiency of the spectrum.

In this embodiment, the information of the dimension may include any one of the following, but is not limited thereto:

a digital beamforming dimension corresponding to a maximum channel quality indication;

a digital beamforming dimension corresponding to a minimum channel quality indication;

a digital beamforming dimension corresponding to an intermediate channel quality indication;

A digital beamforming dimension that corresponds to the channel quality indicating a minimum quantization error.

With the method of the embodiment, the CSI-RS configuration signaling overhead and the feedback overhead can be greatly reduced, the MU-MIMO transmission probability is increased, and the accuracy of the CQI compensation and prediction is improved by the base station side, thereby effectively improving the spectrum. Use efficiency.

Example 3

The embodiment provides a channel state information reference signal (CSI-RS) configuration device, and the device is configured in a base station. The principle of solving the problem is similar to the method of the first embodiment. Therefore, the specific implementation may refer to the implementation. The implementation of the method of Example 1 is not repeated here.

7 is a schematic diagram of a configuration apparatus of the channel state information reference signal (CSI-RS), as shown in FIG. 7, The apparatus 700 includes: a configuration unit 701, configured to send, by using configuration signaling, a configuration of a channel state information reference signal for one beam to a user equipment, where the one beam is included in one beam group, and the beam in the one beam group The configurations of the corresponding channel state information reference signals are related to each other.

In one embodiment, the beams in one beam set satisfy the following conditions: the axial directions are different, and the dimensions of the digital beamforming are the same.

In another embodiment, the beams in one beam set satisfy the condition that the axial directions are the same and the dimensions of the digital beamforming are different.

In this embodiment, as shown in FIG. 7, the apparatus 700 may further include: a grouping unit 702, which divides all available beams into a plurality of beam groups, and channel states corresponding to beams in each beam group The configuration of the information reference signals is related to each other.

In the present embodiment, as described above, the beams in each beam group satisfy the following conditions: the axial directions are different, and the dimensions of the digital beamforming are the same. Alternatively, the beams in each beam set satisfy the following conditions: the axial directions are the same, and the dimensions of the digital beamforming are different.

In this embodiment, each beam group corresponds to a configuration of a set of channel state information reference signals. The set of channel state information reference signals is configured as a set of ports corresponding to one or more channel state information reference signal resources. Or refer to one or more ports corresponding to the signal resources for a set of channel state information.

With the apparatus of this embodiment, the CSI-RS configuration signaling overhead is reduced.

The embodiment further provides a base station configured with a channel state information reference signal (CSI-RS) configuration apparatus 700 as described above.

FIG. 8 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in FIG. 8, base station 800 can include a central processing unit (CPU) 801 and memory 802; and memory 802 is coupled to central processing unit 801. The memory 802 can store various data; in addition, a program for information processing is stored, and the program is executed under the control of the central processing unit 801 to receive various information transmitted by the user equipment and to transmit the request information to the user equipment.

In one embodiment, the functionality of the configuration device 700 of the channel state information reference signal may be integrated into the central processor 801. The central processing unit 801 can be configured to implement the configuration method of the channel state information reference signal described in Embodiment 1.

For example, the central processing unit 801 can be configured to: send configuration of a channel state information reference signal for one beam to a user equipment by configuring signaling, the one beam being included in one beam group, in the one beam group The configurations of the channel state information reference signals corresponding to the beams are related to each other.

In another embodiment, the configuration apparatus 700 of the channel state information reference signal may be configured separately from the central processing unit 801. For example, the configuration apparatus 700 of the channel state information reference signal may be configured as a chip connected to the central processing unit 801 through the center. The control of the processor 801 implements the functions of the configuration device 700 of the channel state information reference signal.

In addition, as shown in FIG. 8, the base station 800 may further include: a transceiver 803, an antenna 804, and the like; wherein the functions of the foregoing components are similar to those of the prior art, and details are not described herein again. It is to be noted that the base station 800 does not have to include all of the components shown in FIG. 8; in addition, the base station 800 may also include components not shown in FIG. 8, and reference may be made to the prior art.

With the base station of this embodiment, the CSI-RS configuration signaling overhead is reduced.

Example 4

The present embodiment provides a channel state information (CSI) feedback device, which is configured in a user equipment. The principle of the device is similar to the method of the second embodiment, and the specific implementation may refer to the method of the second embodiment. Implementation, where the content is the same, will not be repeated.

9 is a schematic diagram of a feedback device for channel state information (CSI) of the present embodiment. As shown in FIG. 9, the device 900 includes a receiving unit 901, a determining unit 902, and a feedback unit 903.

In this embodiment, the receiving unit 901 is configured to receive, by the base station, a configuration of a channel state information reference signal for one beam, where the one beam is included in one beam group, and the beam in the one beam group corresponds to The configuration of the channel state information reference signals is related to each other; the determining unit 902 is configured to determine, according to the configuration of the channel state information reference signals of the one beam, the configuration of the channel state information reference signals of other beams in the beam group in which the beam is located. The feedback unit 903 is configured to feed back channel state information to the base station according to a configuration of a channel state information reference signal of each beam in the beam group.

In this embodiment, the channel state information includes the following information corresponding to each CSI process: two or more channel state information reference signal resource indications (CRIs).

In this embodiment, the channel state information includes the following information corresponding to each CSI process: a channel quality indicator and a dimension of the digital beamforming corresponding to the channel quality indicator. The information of the dimension may be any one of the following: a digital beamforming dimension corresponding to the maximum channel quality indicator; a digital beamforming dimension corresponding to the minimum channel quality indicator; a digital beamforming dimension corresponding to the intermediate channel quality indicator; The channel quality indicates the digital beamforming dimension with the smallest quantization error.

With the device of the embodiment, the CSI-RS configuration signaling overhead and the feedback overhead can be greatly reduced, the MU-MIMO transmission probability is increased, and the accuracy of the CQI compensation and prediction is improved by the base station side, thereby effectively improving the spectrum. Use efficiency.

The embodiment further provides a user equipment, which is provided with a feedback device 900 of channel state information (CSI) as described above.

FIG. 10 is a schematic block diagram showing the system configuration of the user equipment 1000 according to the embodiment of the present invention. As shown in FIG. 10, the user device 1000 can include a central processor 1001 and a memory 1002; the memory 1002 is coupled to the central processor 1001. It should be noted that the figure is exemplary; other types of structures may be used in addition to or in place of the structure to implement telecommunications functions or other functions.

In one embodiment, the functionality of the feedback device 900 of channel state information (CSI) may be integrated into the central processor 1001. The central processing unit 1001 can be configured to implement the feedback method of the channel state information described in Embodiment 2.

For example, the central processing unit 1001 may be configured to: receive, by the base station, a configuration of a channel state information reference signal for one beam, where the one beam is included in one beam group, and the beam in the one beam group corresponds to The configurations of the channel state information reference signals are related to each other; determining, according to the configuration of the channel state information reference signals of the one beam, the configuration of channel state information reference signals of other beams in the beam group in which the beam is located; according to the beam group The channel state information reference signal configuration of each beam is fed back to the base station for channel state information.

In another embodiment, the feedback device 900 of the channel state information may be configured separately from the central processing unit 1001. For example, the feedback device 900 of the channel state information may be configured as a chip connected to the central processing unit 1001 through the central processing unit 1001. The function of the feedback device 900 to implement channel state information is controlled.

As shown in FIG. 10, the user equipment 1000 may further include: a communication module 1003, an input unit 1004, an audio processing unit 1005, a display 1006, and a power source 1007. It should be noted that the user equipment 1000 does not necessarily have to include all the components shown in FIG. 10; in addition, the user equipment 1000 may also include components not shown in FIG. 10, and reference may be made to the prior art.

As shown in FIG. 10, central processor 1001, also sometimes referred to as a controller or operational control, may include a microprocessor or other processor device and/or logic device that receives input and controls each of user devices 1000. The operation of the part.

The memory 1002 may be, for example, a buffer, a flash memory, a hard drive, a removable medium, or a volatile memory. One or more of a reservoir, a non-volatile memory, or other suitable device. The above information related to CSI configuration and feedback can be stored, and a program for executing related information can be stored. And the central processing unit 1001 can execute the program stored by the memory 1002 to implement information storage or processing and the like. The functions of other components are similar to those of the existing ones and will not be described here. The various components of user device 1000 may be implemented by special purpose hardware, firmware, software, or a combination thereof without departing from the scope of the invention.

With the user equipment in this embodiment, the CSI-RS configuration signaling overhead and feedback overhead can be greatly reduced, the MU-MIMO transmission probability is increased, and the accuracy of the CQI compensation and prediction is improved by the base station side, thereby effectively improving The efficiency of the spectrum.

Example 5

The embodiment provides a communication system, including the base station as described in Embodiment 3 and the user equipment as described in Embodiment 4.

11 is a schematic diagram showing the structure of a communication system according to an embodiment of the present invention. As shown in FIG. 11, the communication system 1100 includes a base station 1101 and a user equipment 1102. The base station 1101 may be the base station 800 described in Embodiment 3; the user equipment 1102 may be the user equipment 1000 described in Embodiment 4.

For example, the base station 1101 may be configured to: send, by using configuration signaling, a configuration of a channel state information reference signal for one beam to the user equipment, where the one beam is included in one beam group, and the one beam group The configurations of the channel state information reference signals corresponding to the beams are related to each other; the user equipment 1102 can be configured to: receive a configuration of the channel state information reference signals of the beams, and determine channel states of other beams in the beam group in which the beams are located And configuring the information reference signal to feed back the channel state information to the base station according to the configuration of the channel state information reference signal of each beam in the beam group.

Since the base station and the user equipment have been described in detail in the foregoing embodiments, the contents thereof are incorporated herein, and are not described herein again.

Through the communication system of the embodiment, the CSI-RS configuration signaling overhead and the feedback overhead can be greatly reduced, the MU-MIMO transmission probability is increased, and the accuracy of the CQI compensation and prediction is improved by the base station side, thereby effectively improving The efficiency of the spectrum.

An embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a configuration device or a base station of a channel state information reference signal, the program causes configuration of the channel state information reference signal The configuration method of the channel state information reference signal described in Embodiment 1 is performed in the base station or the base station.

An embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes a configuration device or a base station of a channel state information reference signal to perform configuration of a channel state information reference signal described in Embodiment 1. method.

The embodiment of the present invention further provides a computer readable program, wherein the program causes the feedback device or user equipment of the channel state information to execute an embodiment when the program is executed in a feedback device or user equipment of channel state information 2 The feedback method of channel state information.

The embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes a feedback device of the channel state information or a feedback method of the channel state information described in Embodiment 2 to be performed in the user equipment.

The above apparatus and method of the present invention may be implemented by hardware or by hardware in combination with software. The present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps. The present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like.

The resource allocation method in the resource allocation apparatus described in connection with the embodiment of the present invention may be directly embodied as hardware, a software module executed by a processor, or a combination of both. For example, one or more of the functional block diagrams shown in FIG. 7 or FIG. 9 and/or one or more combinations of functional block diagrams may correspond to respective software modules of a computer program flow, or may correspond to respective hardware modules. . These software modules may correspond to the respective steps shown in FIG. 1 or FIG. 4, respectively. These hardware modules can be implemented, for example, by curing these software modules using a Field Programmable Gate Array (FPGA).

The software module can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. A storage medium can be coupled to the processor to enable the processor to read information from, and write information to, the storage medium; or the storage medium can be an integral part of the processor. The processor and the storage medium can be located in an ASIC. The software module can be stored in the memory of the mobile terminal or in a memory card that can be inserted into the mobile terminal. For example, if a device (such as a mobile terminal) uses a larger capacity MEGA-SIM card or a large-capacity flash memory device, the software module can be stored in the MEGA-SIM card or a large-capacity flash memory device.

One or more of the functional block diagrams described with respect to FIG. 7 or FIG. 9 and/or one or more combinations of functional block diagrams may be implemented as a general purpose processor, digital signal processor (DSP) for performing the functions described herein. An application specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof. One or more of the functional block diagrams described with respect to FIG. 5 or FIG. 7 and/or one or more combinations of functional block diagrams may also be implemented as a combination of computing devices, eg, a combination of a DSP and a microprocessor, multiple micro A processor, one or more microprocessors in communication with the DSP, or any other such configuration.

The present invention has been described in connection with the specific embodiments thereof, and it should be understood by those skilled in the art that A person skilled in the art can make various modifications and changes to the invention in accordance with the principles of the invention, which are also within the scope of the invention.

Claims

A device for configuring a channel state information reference signal is configured in a base station, where the device includes:

a configuration unit, configured to send, by using configuration signaling, a configuration of a channel state information reference signal for a beam, where the one beam is included in one beam group, and the channel state information reference corresponding to the beam in the one beam group The configuration of the signals is related to each other.
The apparatus of claim 1, wherein the beams in the one beam set satisfy the condition that the axial directions are different and the dimensions of the digital beamforming are the same.
The apparatus of claim 1, wherein the beams in the one beam set satisfy the condition that the axial directions are the same and the dimensions of the digital beamforming are different.
The apparatus of claim 1 wherein said apparatus further comprises:

A grouping unit that divides all available beams into a plurality of beam groups, and configurations of channel state information reference signals corresponding to beams in each beam group are related to each other.
The apparatus of claim 4, wherein the beams in each beam set satisfy the condition that the axial directions are different and the dimensions of the digital beamforming are the same.
The apparatus of claim 4, wherein the beams in each beam set satisfy the condition that the axial directions are the same and the dimensions of the digital beamforming are different.
The apparatus of claim 4 wherein each beam set corresponds to a configuration of a set of channel state information reference signals.
The apparatus of claim 7, wherein the set of channel state information reference signals is configured as a set of ports corresponding to one or more channel state information reference signal resources.
The apparatus of claim 7, wherein the set of channel state information reference signals is configured as one or more ports corresponding to a set of channel state information reference signal resources.
A feedback device for channel state information is configured on a user equipment, where the device includes:

a receiving unit, configured to receive, by the base station, a configuration of a channel state information reference signal for one beam, where the one beam is included in one beam group, and the channel state information reference signals corresponding to the beams in the one beam group are configured to each other Related

a determining unit, configured to determine a configuration of a channel state information reference signal of other beams in the beam group in which the beam is located according to a configuration of a channel state information reference signal of the one beam;

And a feedback unit that feeds back channel state information to the base station according to a configuration of a channel state information reference signal of each beam in the beam group.
The apparatus of claim 10, wherein the channel state information comprises: the following information corresponding to each channel state information process:

Two or more channel state information references signal resource indications.
The apparatus of claim 11, wherein the channel state information comprises: following information corresponding to each channel state information process:

The channel quality indicator and the dimension of the digital beamforming corresponding to the channel quality indicator.
The apparatus of claim 12, wherein the information of the dimension is any one of the following:

a digital beamforming dimension corresponding to a maximum channel quality indication;

a digital beamforming dimension corresponding to a minimum channel quality indication;

a digital beamforming dimension corresponding to an intermediate channel quality indication;

A digital beamforming dimension that corresponds to the channel quality indicating a minimum quantization error.
The apparatus of claim 10, wherein the channel state information comprises: the following information corresponding to each channel state information process:

The channel quality indicator and the dimension of the digital beamforming corresponding to the channel quality indicator.
The apparatus of claim 14, wherein the information of the dimension is any one of the following:

a digital beamforming dimension corresponding to a maximum channel quality indication;

a digital beamforming dimension corresponding to a minimum channel quality indication;

a digital beamforming dimension corresponding to an intermediate channel quality indication;

A digital beamforming dimension that corresponds to the channel quality indicating a minimum quantization error.
A communication system including a base station and user equipment, wherein

The base station is configured to: send, by using configuration signaling, a configuration of a channel state information reference signal for one beam to the user equipment, where the one beam is included in one beam group, and the beam in the one beam group corresponds to The configuration of the channel state information reference signals are related to each other;

The user equipment is configured to: receive a configuration of a channel state information reference signal of the beam, and determine a configuration of a channel state information reference signal of other beams in the beam group where the beam is located, according to each beam in the beam group The channel state information reference signal is configured to feed back channel state information to the base station.