CN107888324A - By mobile station, the feedback and method of reseptance of base station execution, mobile station and base station - Google Patents

Abstract

Embodiments of the present invention provide a channel feedback method performed by a mobile station, a channel feedback receiving method performed by a base station, and the corresponding mobile station and base station. The method for channel state feedback performed by a mobile station according to an embodiment of the present invention includes: when a base station triggers a first type of channel state information (CSI) feedback, determining whether the mobile station uses the first type of CSI feedback , and generate a feedback type determination result; send feedback type information indicating the feedback type determination result to the base station; and send channel state feedback to the base station according to the feedback type determination result.

Description

Feedback and reception method performed by mobile station, base station, mobile station and base station

technical field

The present application relates to the field of wireless communication, and specifically relates to a method for channel feedback performed by a mobile station, a method for receiving channel feedback performed by a base station, and the corresponding mobile station and base station.

Background technique

In the field of wireless communication, Channel State Information (CSI, Channel State Information) refers to channel attributes of a communication link. It describes the attenuation factor of the signal on each transmission path, that is, the value of each element in the channel gain matrix H, such as signal scattering, environmental attenuation, distance attenuation and other information. CSI can make the communication system adapt to the current channel conditions, and provides a guarantee for high-reliability and high-speed communication. The feedback of CSI is generally that the mobile station detects the channel state and acquires the CSI, and then periodically or aperiodically reports the acquired CSI to the base station.

In the Rel-14 version of 3GPP LTE, a more advanced codebook may be introduced on the basis of the traditional codebook, for example, a linear combination codebook (linear combination codebook) becomes a possible solution. In order to support these more advanced codebook introduction schemes, the mobile station needs to send more feedback information parameters in the CSI feedback to meet the further requirements of the LTE system.

Contents of the invention

According to one aspect of the present invention, there is provided a channel state feedback method performed by a mobile station, including: when a base station triggers a first type of channel state information (CSI) feedback, determining whether the mobile station uses the first type One type of CSI feedback, and generating a feedback type determination result; sending feedback type information indicating the feedback type determination result to a base station; and sending channel state feedback to the base station according to the feedback type determination result.

According to another aspect of the present invention, there is provided a channel state feedback receiving method performed by a base station, comprising: sending a first type of channel state information (CSI) feedback trigger to a mobile station; receiving feedback type information sent from the mobile station ; and determining the type of channel state feedback sent by the mobile station according to the feedback type information.

According to still another aspect of the present invention, a mobile station is provided, including: a determination unit configured to determine whether the mobile station uses the first type of channel state information (CSI) feedback when the base station triggers the first type of channel state information (CSI) feedback. type of CSI feedback, and generate a feedback type determination result; a sending unit configured to send feedback type information indicating the feedback type determination result to a base station, and send channel state feedback to the base station according to the feedback type determination result.

According to yet another aspect of the present invention, a base station is provided, including: a sending unit configured to send a first type of channel state information (CSI) feedback trigger to a mobile station; a receiving unit configured to receive feedback sent from the mobile station type information; and a determining unit configured to determine, according to the feedback type information, the type of channel state feedback sent by the mobile station.

According to the channel feedback method performed by the mobile station, the channel feedback receiving method performed by the base station, and the corresponding mobile station and base station according to the above aspects of the present invention, the mobile station can determine the feedback type of the channel state and determine according to the determined feedback type. The feedback type determines the result, so as to send corresponding channel state feedback to the base station. The channel state feedback in the present invention may include amplitude and phase information capable of supporting linearly combined codebooks. In addition, the improved channel state reporting mechanism in the present invention can bring performance gain, and can save overhead by avoiding unnecessary channel state reports, so the channel feedback and receiving method according to the present invention can balance the gain and overhead.

Description of drawings

The above and other objects, features and advantages of the present invention will become clearer by describing the embodiments of the present invention in detail with reference to the accompanying drawings.

FIG. 1 shows a schematic diagram of channel feedback and reception operations of a base station and a mobile station for a traditional codebook;

Fig. 2 shows a schematic diagram of the channel feedback and receiving operation of the base station and the mobile station in the embodiment of the present invention after the linear combination codebook is introduced;

FIG. 3 shows a flowchart of a channel state feedback method according to an embodiment of the present invention;

FIG. 4 shows a schematic diagram of channel resources occupied by supplementary PMI information and supplementary CQI information in an embodiment of the present invention;

Fig. 5 shows the information transmission process of the periodic and aperiodic mixed channel state feedback method in the embodiment of the present invention;

FIG. 6 shows the information transmission process of the periodic channel state feedback method in the embodiment of the present invention;

Fig. 7 shows the information transmission process of the periodic channel state feedback method in the embodiment of the present invention;

FIG. 8 shows a schematic diagram of channel resources occupied by the aperiodic channel state feedback method CTI in an embodiment of the present invention;

FIG. 9 shows the information transmission process of the aperiodic channel state feedback method in the embodiment of the present invention;

FIG. 10 shows the information transmission process of the aperiodic channel state feedback method in the embodiment of the present invention;

FIG. 11 shows an example of a feedback mode of an aperiodic channel state feedback method in an embodiment of the present invention;

FIG. 12 shows a flowchart of a method for receiving channel state feedback in an embodiment of the present invention;

Fig. 13 shows a structural block diagram of a mobile station in an embodiment of the present invention;

Fig. 14 shows a structural block diagram of a base station in an embodiment of the present invention.

Detailed ways

The method for channel feedback performed by a mobile station, the method for receiving channel feedback performed by a base station, and the corresponding mobile station and base station according to the embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, like reference numerals denote like elements throughout. It should be understood that the embodiments described herein are illustrative only and should not be construed as limiting the scope of the present invention.

FIG. 1 shows a schematic diagram of channel feedback and reception operations of a base station and a mobile station for a traditional codebook in Rel.13. In Rel.13, for the traditional codebook and only one beam is supported, the channel state feedback method is the traditional feedback method.

When the linear combination codebook is introduced, the feedback methods adopted by the mobile station will include the traditional feedback method and the first type of feedback method, that is, the improved feedback method. These two feedback methods are respectively aimed at the traditional codebook and Linear combination codebook.

In the present invention, the method of using the mobile station to judge the channel state feedback method is used to judge the channel feedback method of the mobile station. Fig. 2 shows a schematic diagram of the channel feedback and reception operation of the base station and the mobile station in the embodiment of the present invention after the linear combination codebook is introduced, wherein the mobile station determines the feedback mode it adopts.

Specifically, the present invention proposes the following embodiments.

First, a channel state feedback method performed by a mobile station according to an embodiment of the present invention is described with reference to FIG. 3 . FIG. 3 shows a flowchart of the channel state feedback method 300 .

As shown in FIG. 3, in step S301, when the base station triggers the first type of channel state information (CSI) feedback, determine whether the mobile station uses the first type of channel state feedback, and generate a feedback type determination result. As mentioned above, the first type of channel state feedback here is an improved channel state information feedback manner corresponding to the linear combination codebook. When the base station triggers the first type of channel state information (CSI) feedback, the mobile station first measures the channel state, and then determines whether the mobile station uses the first type of channel state feedback or not according to the measurement result of the channel state. Use the first type of channel state feedback (that is, use the traditional channel state feedback, the second type of channel state feedback), and generate a feedback type determination result. The measurement of the channel state by the mobile station can be periodic or aperiodic.

In step S302, send feedback type information indicating the feedback type determination result to the base station; and send channel state feedback to the base station according to the feedback type determination result.

The feedback type information here may be sent to the base station periodically or aperiodically. For example, the feedback type information is periodically sent to the base station by using a physical uplink control channel (PUCCH), or the feedback type information is sent aperiodically to the base station by using a physical uplink shared channel (PUSCH).

The foregoing sending the feedback type information indicating the feedback type determination result to the base station and sending the channel state feedback to the base station according to the feedback type determination result can be performed independently. Wherein, sending the feedback type information indicating the feedback type determination result to the base station may be periodic or aperiodic; and sending channel state feedback to the base station according to the feedback type determination result may also be periodic Periodically or non-periodically, the two do not affect each other.

In a preferred embodiment, the channel state feedback method described in the present invention can be performed periodically and aperiodically. Specifically, after the base station triggers the first type of channel state feedback, it may use the PUCCH to periodically send feedback type information indicating the feedback type determination result to the base station. Specifically, the mobile station may use a channel state feedback type indication (CTI) to send feedback type information indicating the feedback type determination result to the base station. The CTI is a new channel state type indicator, and is used to indicate whether the feedback type of the channel state is the traditional channel state feedback or the first type of channel state feedback. It may include two bits to indicate the combination beam number—for example, 00, 01, 10, and 11 represent the number of beams 1-4 respectively; it may also include one bit to indicate the channel state feedback type— For example, 0 represents the second type of channel state feedback, and 1 represents the first type of channel state feedback.

When the mobile station determines to use the first type of channel state feedback, it can send the first channel state feedback to the base station. The sending of the first channel state feedback may be aperiodic. The parameters of the first channel state feedback may include CSI-RS resource indicator (CRI, CSI-RS resource indicator), rank (RI), precoding matrix indicator (PMI, precoding matrix indicator), channel quality indicator (CQI, channel quality indication) and the coefficient (coefficient) for the linear combination codebook, where the coefficient includes phase and amplitude. When sending the parameters of the first channel state feedback, the PMI and the coefficient can be sent separately, or the coefficient and PMI2 can be combined and sent to include Coefficient of PMI2.

When it is determined that the mobile station does not use the first type of channel state feedback, send a second channel state feedback to the base station, and the parameters of the second channel state feedback may include a CSI-RS resource indicator (CRI, CSI-RS resource indicator) , rank (RI), precoding matrix indicator (PMI, precoding matrix indicator), channel quality indicator (CQI, channel quality indication), the parameters of the second channel state feedback may be different from the parameters of the first channel state feedback. The first channel state feedback is sent to the base station aperiodically, and the second channel feedback is sent to the base station periodically. The first channel feedback is independent of the second channel feedback.

In another preferred embodiment of the present invention, the channel state feedback method can also be performed periodically and aperiodically. Specifically, after the base station triggers the first type of channel state feedback, it uses the PUCCH to periodically send feedback type information indicating the result of the feedback type determination to the base station. Specifically, the mobile station can use the channel state feedback type indication (CTI ) sending feedback type information indicating the feedback type determination result to the base station. Moreover, regardless of the feedback result of the CTI, the mobile station also periodically sends the second channel state feedback to the base station.

In addition, when it is determined that the mobile station uses the first type of channel state feedback, the method in this embodiment further includes: sending the first channel state feedback to the base station aperiodically, and the first channel state feedback includes State feedback supplementary information included in the second channel state feedback. Specifically, the state feedback supplementary information may include: supplementary PMI information, supplementary CQI information, and coefficients. As shown in Figure 4, in the aperiodic first channel state feedback, supplementary PMI information and supplementary CQI information can be placed in the area shown by the ellipse in the figure, adjacent to the original PMI and CQI, to more accurately represent the first A channel state feedback information.

Fig. 5 shows the information transmission process of the periodic and aperiodic mixed channel state feedback method represented by the aforementioned two preferred embodiments. The base station triggers the first type of channel state information feedback, the mobile station determines the result of the feedback type determination through channel detection, and sends it to the base station through CTI, and then sends the parameters of the channel state feedback to the base station according to the feedback type determination result.

In yet another preferred embodiment of the present invention, the channel state feedback method can be performed periodically. Specifically, after the base station triggers the first type of channel state feedback, it uses the PUCCH to periodically send the feedback type information indicating the result of the feedback type determination to the base station, and the mobile station can use the channel state feedback type indication (CTI) to send the feedback type information to the base station. Sending the feedback type information indicating the feedback type determination result may also use a precoding type indicator (PTI) to send the feedback type information indicating the feedback type determination result to the base station. The PTI is an existing type indicator in the PUCCH, and the embodiment of the present invention can indicate different feedback types of the channel state by appropriately expanding the original PTI. For example, the PTI can be extended to 3 bits to indicate the number of feedback beams: the last two bits are used to indicate the number of combined beams, or the last bit is used to indicate the type of channel state feedback.

When it is determined that the mobile station uses the first type of channel state feedback, periodically send the first channel state feedback to the base station; when it is determined that the mobile station uses the second type of channel state feedback, periodically send the first channel state feedback to the base station; The base station sends second channel state feedback. The relevant parameters of the first channel state feedback and the second channel state feedback are as described above, and will not be repeated here. Likewise, in the first type of channel state feedback, the PMI and the coefficients may be sent separately, or the coefficients and the PMI may be combined to send PMI2 including the coefficients.

In the implementation process of periodically feeding back CSI, when information overflows, subsampling, adding a new feedback type (feedback type) and using PUCCH format (format) 3 can be used to avoid information overflow.

Specifically, for a new type of feedback, the following formula can be used to express:

(10×n _f +|n _s /2|-N _{OFFSET,coefficients} ) mod(Q×N _pd )=0,

In the formula, n _f is the frame, n _s is the time slot in the frame, N _{OFFSET,coefficients} is the offset of the coefficient report after the PMI2 index (index) is reported, N _pd is the period of the coefficient report, and Q is the coefficient report The multiple value of the period.

For PUCCH format 3, CSI now supports format 2 and format 3 in PUCCH. The overhead of PUCCH format 2 is a maximum of 11 bits, while the overhead of PUCCH format 3 is a maximum of 22 bits. Therefore, PUCCH format 3 can be used to support larger load.

FIG. 6 and FIG. 7 show the information transmission process of the periodic channel state feedback method represented by the above-mentioned embodiments. 6 uses PTI to report feedback type information to the base station, and FIG. 7 uses CTI to report feedback type information to the base station. Specifically, in FIG. 6, the base station triggers the first type of channel state information feedback through a signal and configures the reporting instance (reporting instance), which includes the position and period configured in the subframe, and the mobile station determines the feedback type through channel detection. The result is sent to the base station through the PTI, and then the parameters of the channel state feedback are sent to the base station according to the feedback type determination result. The flow in FIG. 7 is similar to that in FIG. 6, except that the mobile station sends the detected feedback type determination result to the base station through the CTI.

In yet another preferred embodiment of the present invention, the channel state feedback method can be performed aperiodically. Specifically, feedback type information indicating the feedback type determination result may be sent to the base station aperiodically, and channel state feedback may be sent to the base station according to the feedback type determination result. Wherein, after the base station triggers the first type of channel state feedback, it aperiodically sends the feedback type information indicating the feedback type determination result to the base station. When it is determined that the mobile station uses the first type of channel state feedback, aperiodically sending the first channel state feedback to the base station; when it is determined that the mobile station does not use the first type of channel state feedback, Send the second channel state feedback to the base station aperiodically. The parameters that are fed back are the same as those described above, and will not be repeated here. For aperiodic channel state feedback, the PMI and the coefficients can be sent separately, or the coefficients and the PMI can be combined to send the PMI including the coefficients. In addition, the channel state feedback may include a rank indication (RI), and the mobile station may send the feedback type information using resources adjacent to the resources configured to send the rank indication. For example, the mobile station can send feedback type information to the base station by using a Channel State Feedback Type Indicator (CTI), and the CTI can be placed in the area shown by the oval in Figure 8, adjacent to the RI.

FIG. 9 and FIG. 10 show the information transmission process of the aperiodic channel state feedback method represented by the above embodiments. Wherein, FIG. 9 sends PMI and beam coefficients respectively, while FIG. 10 sends PMI2 including the combination of coefficients. Specifically, the base station triggers the first type of channel state information feedback, the mobile station determines the feedback type determination result through channel detection, and sends it to the base station through CTI, and then sends the parameters of the channel state feedback to the base station according to the feedback type determination result.

The aperiodic channel state feedback method in the embodiment of the present invention adds a new feedback mode (mode) for wideband (wideband) feedback and/or subband (subband) feedback. Wherein, the linearly combined beam coefficient/PMI may be fed back only on the subband, or the linearly combined beam coefficient/PMI may be fed back on both the wideband and the subband. Several examples of feedback modes are shown in FIG. 11 , and FIG. 11 shows schematic diagrams of feedback in different modes (1-3, 2-3, 3-3). When it is necessary to report coefficients including phase and amplitude, a new aperiodic feedback mode (indicated by cqi-ReportModeAperiodic ) needs to be introduced on the basis of the traditional feedback mode.

In the channel state feedback method provided by the embodiment of the present invention, the mobile station can determine the feedback type of the channel state and determine the feedback type determination result according to the determined feedback type, so as to send corresponding channel state feedback to the base station. The channel state feedback in the embodiment of the present invention may include amplitude and phase information capable of supporting a linearly combined codebook. In addition, the improved channel state reporting mechanism in the embodiments of the present invention can bring performance gains and save overhead by avoiding unnecessary channel state reports, so the channel feedback method according to the present invention can balance gains and overheads.

Next, a channel state feedback receiving method performed by a base station according to an embodiment of the present invention is described with reference to FIG. 12 . FIG. 12 shows a flowchart of the method 1200 for receiving channel state feedback.

As shown in Fig. 12, in step S1201, a first type of channel state information (CSI) feedback trigger is sent to the mobile station. When the base station needs to determine the channel state feedback type of the mobile station, it will first send the first type of channel state feedback trigger to the mobile station, so as to trigger the mobile station to perform channel detection and generate a feedback determination result. The feedback type may include a first type of channel state feedback and a second type of channel state feedback. Here, the first type of channel state feedback is the improved channel state information feedback method corresponding to the linear combination codebook, and the second type of channel state feedback is the traditional channel state feedback method.

In step S1202, the feedback type information sent from the mobile station is received.

In this step, after the mobile station obtains the feedback type determination result, it will send feedback type information indicating the feedback type determination result to the base station. The base station will receive this feedback type information sent by the mobile station.

In step S1203, the type of the channel state feedback sent by the mobile station is determined according to the feedback type information. The base station analyzes the feedback type information sent by the mobile station and determines the feedback type of the mobile station accordingly. Both the feedback type information and the channel state feedback sent by the mobile station to the base station can be periodic or aperiodic. When the above information is sent to the base station periodically, it will occupy the Physical Uplink Control Channel (PUCCH) for information transmission, and when the above information is sent to the base station aperiodically, it will occupy the Physical Uplink Shared Channel (PUSCH) for transmission . Specifically, the mobile station may use a channel state feedback type indication (CTI) to send feedback type information indicating the feedback type determination result to the base station. CTI is a new channel state type indicator, which is used to indicate whether the channel state feedback type is traditional channel state feedback or the first type of channel state feedback; the existing precoding type indication (PTI) can also be used in PUCCH Sending feedback type information indicating the feedback type determination result to the base station.

Optionally, the base station may receive the channel state feedback sent by the mobile station according to the determined type of the channel state feedback. Wherein, when the mobile station determines to use the first type of channel state feedback, it may send the first channel state feedback to the base station. The parameters of the first channel state feedback may include CSI-RS resource indication (CRI, CSI-RS resource indicator), rank (RI), precoding matrix indicator (PMI, precoding matrix indicator), channel quality indication (CQI, channel quality indication ) and the coefficient (coefficient) for the linear combination codebook, wherein the coefficient includes phase and amplitude, when sending the parameters of the first channel state feedback, the PMI and the coefficient can be sent separately, or the coefficient can be combined with the PMI to send the coefficient The PMI2. When the mobile station determines not to use the first type of channel state feedback, it will send the second channel state feedback to the base station, and the parameters of the second channel state feedback may include a CSI-RS resource indicator (CRI, CSI-RS resource indicator) , rank (RI), precoding matrix indicator (PMI, precoding matrix indicator), channel quality indicator (CQI, channel quality indication), the parameters of the second channel state feedback may be different from the parameters of the first channel state feedback.

In the channel state feedback receiving method provided by the embodiment of the present invention, the base station does not need to determine the feedback type of the channel state of the mobile station, but is determined by the mobile station itself according to channel detection, and the base station only needs to receive the channel state feedback type information determined by the mobile station And corresponding channel state feedback is received accordingly, thereby improving the transmission performance and communication efficiency of the wireless communication system. The channel state feedback in the embodiment of the present invention may include amplitude and phase information supporting a linear combination codebook, and can support a new generation of 3GPP LTE standard.

Next, a mobile station according to an embodiment of the present invention will be described with reference to FIG. 13 . FIG. 13 shows a block diagram of a mobile station 1300 according to an embodiment of the present invention.

As shown in FIG. 13 , the mobile station includes a determining unit 1310 and a sending unit 1320 . In addition to these two units, the mobile station 1300 may also include other components, however, since these components are irrelevant to the content of the embodiment of the present invention, illustration and description thereof are omitted here. In addition, since the specific details of the following operations performed by the mobile station 1300 according to the embodiment of the present invention are the same as those described above with reference to FIGS. 3-11 , repeated descriptions of the same details are omitted here to avoid repetition.

The determining unit 1310 in the mobile station 1300 of FIG. 13 is configured to determine whether the mobile station uses the first type of channel state information (CSI) feedback when the base station triggers the first type of channel state information (CSI) feedback, and generate feedback Type determines the result. As mentioned above, the first type of channel state feedback here is an improved channel state information feedback manner corresponding to the linear combination codebook. When the base station triggers the first type of channel state information (CSI) feedback, the channel state is first measured by a measurement unit (not shown in the figure), and then the determination unit 1310 is used to determine the first The type of channel state feedback still does not use the first type of channel state feedback (that is, use the traditional channel state feedback, the second type of channel state feedback), and generate a feedback type determination result. The measurement of the channel state by the mobile station can be periodic or aperiodic.

The sending unit 1320 is configured to send feedback type information indicating the feedback type determination result to the base station; and send channel state feedback to the base station according to the feedback type determination result.

The feedback type information here may be sent to the base station periodically or aperiodically. When the feedback type information is sent to the base station periodically, it will occupy the Physical Uplink Control Channel (PUCCH) for information transmission, and when the feedback type information is sent to the base station aperiodically, it will occupy the Physical Uplink Shared Channel (PUSCH) to send.

Wherein, in a preferred embodiment, the sending unit 1320 can feed back the channel state periodically and aperiodically. Specifically, after the base station triggers the first type of channel state feedback, the sending unit 1320 may use the PUCCH to periodically send feedback type information indicating the feedback type determination result to the base station. Specifically, the sending unit 1320 may use a channel state feedback type indication (CTI) to send feedback type information indicating the feedback type determination result to the base station. The CTI is a new channel state type indicator, and is used to indicate whether the feedback type of the channel state is the traditional channel state feedback or the first type of channel state feedback. The CTI is fed back together with the original PTI and rank (RI) in the PUCCH. It may include two bits to indicate the combination beam number (combination beam number)—for example, 00,01,10,11 represent the number of beams 1-4 respectively; it may also include one bit to indicate the channel state feedback type— - For example, 0 represents the second type of channel state feedback, and 1 represents the first type of channel state feedback.

When the determining unit 1310 determines to use the first type of channel state feedback, the sending unit 1320 may send the first channel state feedback to the base station. The sending of the first channel state feedback may be aperiodic. The parameters of the first channel state feedback may include CSI-RS resource indicator (CRI, CSI-RS resource indicator, rank (RI), precoding matrix indicator (PMI, precoding matrix indicator), channel quality indicator (CQI, channel quality indication) And for the coefficient (coefficient) of the linear combination codebook, wherein the coefficient includes phase and amplitude, when sending the parameters of the first channel state feedback, the PMI and the coefficient can be sent separately, or the coefficient and the PMI can be combined to send the coefficient containing the coefficient PMI2.

When the determining unit 1310 determines that the mobile station does not use the first type of channel state feedback, the sending unit 1320 sends the second channel state feedback to the base station, and the parameters of the second channel state feedback may include CSI-RS resource indication (CRI , CSI-RS resource indicator), rank (RI), precoding matrix indicator (PMI, precoding matrix indicator), channel quality indicator (CQI, channel quality indication), the parameters of the second channel state feedback and the parameters of the first channel state feedback Parameters can be different. The first channel state feedback is sent to the base station aperiodically, and the second channel feedback is sent to the base station periodically. The first channel feedback is independent of the second channel feedback.

In another preferred embodiment of the present invention, the sending unit 1320 is also capable of periodically and aperiodically feeding back the channel state. Specifically, after the base station triggers the first type of channel state feedback, the sending unit 1320 uses the PUCCH to periodically send feedback type information indicating the result of the feedback type determination to the base station. Specifically, the sending unit 1320 can use the channel state feedback The type indication (CTI) sends feedback type information indicating the result of determining the feedback type to the base station. Moreover, regardless of the CTI feedback result, the sending unit 1320 also periodically sends the second channel state feedback to the base station.

In addition, when the determining unit 1310 determines that the mobile station uses the first type of channel state feedback, the sending unit 1320 is further configured to aperiodically send the first channel state feedback to the base station, and the first channel state feedback Including state feedback supplementary information not included in the second channel state feedback. Specifically, the state feedback supplementary information may include: supplementary PMI information, supplementary CQI information, and coefficients. As shown in Figure 4, in the aperiodic first channel state feedback, supplementary PMI information and supplementary CQI information can be placed in the area shown by the ellipse in the figure, adjacent to the original PMI and CQI, to more accurately represent the first A channel state feedback information.

Fig. 5 shows the information transmission process of the mobile station represented by the aforementioned two preferred embodiments. Wherein, the base station triggers the first type of channel state information feedback, the determining unit 1310 in the mobile station determines the feedback type determination result through channel detection, and sends the CTI to the base station through the sending unit 1320, and then the sending unit 1320 sends the channel state information according to the feedback type determination result Each parameter of status feedback is sent to the base station.

In yet another preferred embodiment of the present invention, the mobile station can periodically feed back the channel state. Specifically, after the base station triggers the first type of channel state feedback, the sending unit 1320 uses the PUCCH to periodically send feedback type information indicating the result of the feedback type determination to the base station. Specifically, the sending unit 1320 can use the channel state feedback The type indication (CTI) sends the feedback type information indicating the feedback type determination result to the base station, and the precoding type indication (PTI) may also be used to send the feedback type information indicating the feedback type determination result to the base station. The PTI is an existing type indicator in the PUCCH, and the embodiment of the present invention can indicate different feedback types of the channel state by appropriately expanding the original PTI. For example, the PTI can be extended to 3 bits to indicate the number of feedback beams: the last two bits are used to indicate the number of combined beams, or the last bit is used to indicate the type of channel state feedback.

When the determining unit 1310 determines that the mobile station uses the first type of channel state feedback, the sending unit 1320 periodically sends the first channel state feedback to the base station; when the determining unit 1310 determines that the mobile station uses the second type of channel state feedback During channel state feedback, the sending unit 1320 periodically sends the second channel state feedback to the base station. The relevant parameters of the first channel state feedback and the second channel state feedback are as described above, and will not be repeated here. Likewise, in the first type of channel state feedback, the PMI and the coefficients may be sent separately, or the coefficients and the PMI may be combined to send PMI2 including the coefficients.

During the implementation of the periodic channel state feedback, when the information overflows, the information overflow can be avoided by subsampling, adding a new feedback type (feedback type) and adopting PUCCH format (format)3.

Fig. 6 and Fig. 7 show the information transmission process of the mobile station represented by the above embodiments. Wherein, in FIG. 6 , the mobile station uses PTI to report feedback type information to the base station, and in FIG. 7 , the mobile station uses CTI to report feedback type information to the base station. Specifically, in FIG. 6, the base station triggers the first type of channel state information feedback through a signal and configures a reporting instance (reporting instance), which includes the position, period, etc. configured in the subframe, and the determination unit 1310 in the mobile station detects Determine the feedback type determination result, and send the PTI to the base station through the sending unit 1320, and then the sending unit 1320 sends each parameter of channel state feedback to the base station according to the feedback type determination result. The flow in FIG. 7 is similar to that in FIG. 6 , except that the sending unit 1320 sends the detected feedback type determination result to the base station through the CTI.

In yet another preferred embodiment of the present invention, the mobile station can feed back the channel state aperiodically. Specifically, the sending unit 1320 may aperiodically send feedback type information indicating the feedback type determination result to the base station, and send channel state feedback to the base station according to the feedback type determination result. Wherein, after the base station triggers the first type of channel state feedback, the sending unit 1320 aperiodically sends feedback type information indicating the feedback type determination result to the base station. When the determining unit 1310 determines that the mobile station uses the first type of channel state feedback, the sending unit 1320 aperiodically sends the first channel state feedback to the base station; when the determining unit 1310 determines that the mobile station does not use the During the first type of channel state feedback, the sending unit 1320 aperiodically sends the second channel state feedback to the base station. The parameters that are fed back are the same as those described above, and will not be repeated here. For aperiodic channel state feedback, the PMI and the coefficients can be sent separately, or the coefficients and the PMI can be combined to send the PMI including the coefficients. In addition, the channel state feedback may include a rank indication (RI), and the sending unit 1320 in the mobile station may use resources adjacent to the resources configured to send the rank indication to send the feedback type information. For example, the sending unit 1320 may send feedback type information to the base station by using a Channel State Feedback Type Indicator (CTI), and the CTI may be placed in the area shown by the oval in FIG. 8 , adjacent to the RI.

Figure 9 and Figure 10 show the information transmission process of the mobile station represented by the above embodiments. Wherein, in FIG. 9 , the PMI and the beam coefficient are respectively sent by the sending unit 1320 , while in FIG. 10 , the PMI2 including the product of the coefficient and is sent by the sending unit 1320 . Specifically, the base station triggers the first type of channel state information feedback, the determination unit 1310 in the mobile station determines the feedback type determination result through channel detection, and sends the CTI to the base station through the sending unit 1320, and then the sending unit 1320 sends the CTI to the base station according to the feedback type determination result Each parameter of the channel state feedback is sent to the base station.

The aperiodic channel state feedback of the mobile station in the embodiment of the present invention introduces a new feedback mode (mode) for wideband (wideband) feedback and/or subband (subband) feedback. Wherein, the mobile station may only feed back the linearly combined beam coefficient/PMI on the sub-band, or may feed back the linearly combined beam coefficient/PMI on the wideband and the sub-band together. Several examples of feedback modes are shown in FIG. 11 , and FIG. 11 shows schematic diagrams of channel feedback in different modes (1-3, 2-3, 3-3).

The mobile station provided by the embodiment of the present invention can determine the feedback type of the channel state and determine the feedback type determination result according to the determined feedback type, so as to send corresponding channel state feedback to the base station. The channel state feedback sent by the mobile station in the embodiment of the present invention may include amplitude and phase information capable of supporting a linearly combined codebook. In addition, the improved channel state reporting mechanism in the embodiments of the present invention can bring performance gains, and can save overhead by avoiding unnecessary channel state reports, so the mobile station in the embodiments of the present invention can balance the gains and overheads.

Next, a base station according to an embodiment of the present invention will be described with reference to FIG. 14 . Fig. 14 shows a block diagram of a base station 1400 according to an embodiment of the present invention. As shown in FIG. 14 , the base station 1400 includes a sending unit 1410 , a receiving unit 1420 and a determining unit 1930 . In addition to these three units, the base station 1400 may also include other components. However, since these components are irrelevant to the content of the embodiment of the present invention, illustration and description thereof are omitted here. In addition, since the specific details of the following operations performed by the base station 1400 according to the embodiment of the present invention are the same as those described above with reference to FIG. 12 , repeated descriptions of the same details are omitted here to avoid repetition.

The sending unit 1410 in FIG. 14 is configured to send a first type of channel state information (CSI) feedback trigger to the mobile station. When the base station needs to determine the channel state feedback type of the mobile station, the sending unit 1410 first sends the first type of channel state feedback trigger to the mobile station, so as to trigger the mobile station to perform channel detection and generate a feedback determination result. The feedback type may include a first type of channel state feedback and a second type of channel state feedback. Here, the first type of channel state feedback is the improved channel state information feedback method corresponding to the linear combination codebook, and the second type of channel state feedback is the traditional channel state feedback method.

The receiving unit 1420 is configured to receive feedback type information sent from the mobile station. After obtaining the feedback type determination result, the mobile station will send feedback type information indicating the feedback type determination result to the base station. The receiving unit 1420 will receive the feedback type information sent by the mobile station.

The determining unit 1430 is configured to determine, according to the feedback type information, the type of channel state feedback sent by the mobile station. The determining unit 1430 analyzes the feedback type information sent by the mobile station and determines the feedback type of the mobile station accordingly. Both the feedback type information and the channel state feedback sent by the mobile station to the base station can be periodic or aperiodic. When the above information is sent to the base station periodically, it will occupy the Physical Uplink Control Channel (PUCCH) for information transmission, and when the above information is sent to the base station aperiodically, it will occupy the Physical Uplink Shared Channel (PUSCH) for transmission . Specifically, the mobile station may use a channel state feedback type indication (CTI) to send feedback type information indicating the feedback type determination result to the base station. CTI is a new CSI type indicator, which is used to indicate whether the feedback type of the channel state is the traditional channel state feedback or the first type of channel state feedback; the existing precoding type indication (PTI) can also be used in the PUCCH to The base station sends feedback type information indicating the feedback type determination result.

Optionally, the receiving unit 1420 may also receive channel state feedback sent by the mobile station according to the determined type of channel state feedback. Wherein, when the mobile station determines to use the first type of channel state feedback, it may send the first channel state feedback to the base station. The parameters of the first channel state feedback may include CSI-RS resource indicator (CRI, CSI-RSresource indicator, rank (RI), precoding matrix indicator (PMI, precoding matrix indicator), channel quality indicator (CQI, channel quality indication) And for the coefficient (coefficient) of the linear combination codebook, wherein the coefficient includes phase and amplitude, when sending the parameters of the first channel state feedback, the PMI and the coefficient can be sent separately, or the coefficient and the PMI can be combined to send the coefficient containing the coefficient PMI2. When the mobile station determines not to use the channel state feedback of the first type, it will send the second channel state feedback to the base station, and the parameters of the second channel state feedback may include CSI-RS resource indication (CRI, CSI-RS resource indicator), rank (RI), precoding matrix indicator (PMI, precoding matrix indicator), channel quality indication (CQI, channel quality indication), the parameters of the second channel state feedback may be different from the parameters of the first channel state feedback.

According to the base station provided by the embodiment of the present invention, it does not need to determine the feedback type of the channel state of the mobile station, but is determined by the mobile station itself according to channel detection, and the base station in the embodiment of the present invention only needs to receive the channel state feedback type determined by the mobile station Information and receive corresponding channel state feedback accordingly, thereby improving the transmission performance and communication efficiency of the wireless communication system. In the embodiment of the present invention, the channel state feedback received by the base station may include amplitude and phase information supporting a linear combination codebook, and can support a new generation of 3GPP LTE standard.

The above operations of the mobile station 1300 and the base station 1400 may be implemented by hardware, or by a software module executed by a processor, and further may be implemented by a combination of the two.

Software modules can be arranged in storage media of any format, such as RAM (Random Access Memory), Flash, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM) , registers, hard disks, removable disks, and CD-ROMs.

Such a storage medium is coupled to the processor such that the processor can write information to, and read information from, the storage medium. Such storage media can also be accumulated in the processor. Such a storage medium and a processor may be arranged in an ASIC. Such an ASIC may be arranged in the mobile station 1300 and the base station 1400 . Such a storage medium and a processor may be arranged in the mobile station 1300 and the base station 1400 as discrete components.

Therefore, the present invention has been explained in detail by using the above-mentioned embodiments; however, it should be clear to those skilled in the art that the present invention is not limited to the logically explained embodiments. The invention can be implemented in corrected, modified modes without departing from the scope of the invention defined by the claims. Therefore, the description of the specification is intended to explain examples only, and does not impose any limiting meaning on the present invention.

Claims (22)

1. a kind of channel state feedback method performed by mobile station, including：

When base station triggers during the channel condition information of the first kind (CSI) feedback, determine the mobile station whether using described The CSI feedback of the first kind, and generate feedback kind and determine result；

The feedback type information for indicating that the feedback kind determines result is sent to base station；And

Determine that result sends channel state feedback to the base station according to the feedback kind.

2. the method for claim 1, wherein

Sent to base station and indicate that the feedback kind determines that the feedback type information of result includes：The first kind in base station triggers CSI feedback after, the feedback type information for indicating that the feedback kind determines result is periodically sent to base station；

Determine that result sends channel state feedback to the base station and included according to the feedback kind：When it is determined that the mobile station makes During with the CSI feedback of the first kind, the first channel state feedback is sent to base station.

3. method as claimed in claim 2, determine that result is anti-to base station transmission channel status according to the feedback kind Feedback also includes：

When it is determined that the mobile station without using the first kind CSI feedback when, to base station send second channel feedback of status, Wherein

The first channel state feedback aperiodically is sent to the base station,

First channel feedback is fed back independently of the second channel.

4. method as claimed in claim 2, in addition to：

In base station triggers after the CSI feedback of the first kind, second channel feedback of status periodically is sent to base station, wherein

The first channel state feedback aperiodically is sent to base station, and

First channel state feedback includes the feedback of status side information being not included in the second channel feedback of status.

5. method as claimed in claim 2, wherein when it is determined that the mobile station uses the CSI feedback of the first kind, Sending the first channel state feedback to base station includes：

When it is determined that the mobile station uses the CSI feedback of the first kind, periodically the first channel shape is sent to base station State is fed back.

6. method as claimed in claim 5, wherein sending the feedback kind for indicating that the feedback kind determines result to base station Information includes：

Indicate that (PTI) sends the feedback type information for indicating that the feedback kind determines result to base station using precoding type.

7. the method as described in claim 1, wherein

The feedback type information for indicating that the feedback kind determines result is aperiodically sent to base station, and according to described anti- Feedback type determines that result sends channel state feedback to the base station.

8. method as claimed in claim 7, wherein

The channel state feedback includes order instruction,

Sent to base station and indicate that the feedback kind determines that the feedback type information of result includes：

Using neighbor configuration the feedback type information is sent to send the resource of the resource of the order instruction.

9. the method as described in any one in claim 1-5 and 7-8, indicate that the feedback kind is true wherein being sent to base station Determining the feedback type information of result includes：

The feedback type information for indicating that the feedback kind determines result is sent to base station using CSI feedback type instruction (CTI).

10. the method as described in any one in claim 1-5 and 7-8, wherein the channel of the first kind when base station triggers When status information (CSI) is fed back, determine whether the mobile station is included using the CSI feedback of the first kind：

When base station triggers during the channel condition information of the first kind (CSI) feedback, channel status is measured；And

According to the measurement result of channel status, determine whether the mobile station uses the CSI feedback of the first kind.

11. a kind of channel state feedback method of reseptance performed by base station, including：

The channel condition information (CSI) that the first kind is sent to mobile station feeds back triggering；

Receive the feedback type information sent from mobile station；And

Determine the mobile station to the type of the channel state feedback of transmission according to the feedback type information.

12. a kind of mobile station, including：

Determining unit, when channel condition information (CSI) feedback of the first kind has been configured to when base station triggers, determines the movement Whether platform uses the CSI feedback of the first kind, and generates feedback kind and determine result；

Transmitting element, it is configured to send the feedback type information for indicating that the feedback kind determines result to base station, and according to The feedback kind determines that result sends channel state feedback to the base station.

13. mobile station as claimed in claim 12, wherein

The transmitting element after the CSI feedback of the first kind, periodically sends to base station in base station triggers and indicates the feedback Type determines the feedback type information of result, and when it is determined that the mobile station uses the CSI feedback of the first kind, to Base station sends the first channel state feedback.

14. mobile station as claimed in claim 13, wherein

The transmitting element be additionally configured to when it is determined that the mobile station without using the first kind CSI feedback when, to base station Second channel feedback of status is sent, wherein

The transmitting element aperiodically sends the first channel state feedback to the base station,

First channel feedback is fed back independently of the second channel.

15. mobile station as claimed in claim 13, wherein

After the transmitting element has been additionally configured in base station triggers the CSI feedback of the first kind, periodically the is sent to base station Two channel state feedbacks, wherein

The transmitting element aperiodically sends the first channel state feedback to base station, and

First channel state feedback includes the feedback of status side information being not included in the second channel feedback of status.

16. mobile station as claimed in claim 13, wherein

The transmitting element is periodically sent out when it is determined that the mobile station uses the CSI feedback of the first kind to base station Send the first channel state feedback.

17. mobile station as claimed in claim 16, wherein

The transmitting element is sent to base station using precoding type instruction (PTI) and indicates that the feedback kind determines the anti-of result Present type information.

18. mobile station as claimed in claim 12, wherein

The transmitting element aperiodically sends the feedback type information for indicating that the feedback kind determines result to base station, with And determine that result sends channel state feedback to the base station according to the feedback kind.

19. mobile station as claimed in claim 18, wherein

The channel state feedback includes order instruction,

The transmitting element sends the feedback type information using neighbor configuration to send the resource of the resource of the order instruction.

20. the mobile station as described in any one in claim 12-16 and 18-19, wherein

The transmitting element is sent to base station using CSI feedback type instruction (CTI) and indicates that the feedback kind determines result Feedback type information.

21. the mobile station as described in any one in claim 12-16 and 18-19, in addition to：

Measuring unit, when being configured to when base station triggers channel condition information (CSI) feedback of the first kind, channel status is entered Row measurement, wherein

Whether the determining unit determines the mobile station using the first kind according to the measurement result of channel status CSI feedback.

22. a kind of base station, including：

Transmitting element, the channel condition information (CSI) for being configured to send the first kind to mobile station feed back triggering；

Receiving unit, it is configured to receive the feedback type information sent from mobile station；And

Determining unit, it is configured to determine the mobile station to the class of the channel state feedback of transmission according to the feedback type information Type.