WO2013010468A1

WO2013010468A1 - Method and device for transmitting channel state information

Info

Publication number: WO2013010468A1
Application number: PCT/CN2012/078696
Authority: WO
Inventors: 高雪娟; 沈祖康; 林亚男
Original assignee: 电信科学技术研究院
Priority date: 2011-07-19
Filing date: 2012-07-16
Publication date: 2013-01-24
Also published as: CN102255694A

Abstract

Disclosed in Embodiments of the present application are a method and device for transmitting the Channel State Information (CSI), involve technology field of wireless communication, and are used for feedback CSI of multiple downlink carriers at the same time to improve accuracy of downlink scheduling. In the present application, A User Equipment (UE) determines a CSI feedback bit number threshold of the current uplink sub-frame, and determines the total CSI feedback bit number of the multiple downlink carriers which demand to feed CSI back in the current uplink sub-frame. The UE judges whether said total CSI feedback bit number is larger than said CSI feedback bit number threshold; if yes, the CSI demanding to be fed back in the current uplink sub-frame is compressed; else, the CSI of said multiple downlink carriers are fed a Base Station (BS) back in the current uplink sub-frame. Obviously, the accuracy of the downlink scheduling is improved in the present application.

Description

Channel state information transmission method and device. The present application claims priority to Chinese Patent Application No. 201110202564.X, entitled "Channel State Information Transmission Method and Apparatus", filed on July 19, 2011, The entire contents are incorporated herein by reference.

Technical field

The present invention relates to the field of wireless communications, and in particular, to a channel state information transmission method and device.

Background technique

For the Long Term Evolution Advanced (LTE-A) system, in order to support a wider system bandwidth than the Long Term Evolution (LTE) system, some spectrum allocated to the existing system can be aggregated and made up. The large bandwidth is used by the long-term evolution multi-carrier system, that is, Carrier Aggregation (CA) technology. At this time, the uplink and downlink carriers in the system can be asymmetrically configured, that is, the user may occupy Nl ≥ 1 carriers for downlink transmission, and N2 ≥ 1 carriers for uplink transmission, as shown in FIG. 1 .

In the LTE-A Release 10 (Rel-10) CA system, in order to perform the carrier scheduling and the link adaptation process effectively, the eNodeB (evolved Node-B, eNB) needs to obtain multiple measurements by the user equipment (UE). The channel state information (CSI) of the downlink carrier is used for multi-carrier scheduling. The CSI may include a rank indicator (RI) information, a channel quality indicator (CQI) information, a precoding matrix indicator (PMI M message, and a precoding type indicator (PTI). Information, wherein the CQI information is further divided into wideband CQI (Wide-band CQI) information and sub-band CQI (Sub-band CQI) information. For each carrier in the UE aggregated carrier that is active, the UE may follow the following four types. Reporting Mode Sends periodic CSI on the Physical Uplink Control CHannel (PUCCH):

The first type, Mode 1 -0 (ie broadband CQI reporting mode, no PMI):

In the RI report subframe (only valid for transmission mode 3): The UE needs to report a type (Type) 3 report containing an RI value;

In the CQI reporting subframe: The UE needs to report a Type 4 report containing a wideband CQI value. The Type 4 report only contains the CQI value of the codeword 0, regardless of whether the RI value is greater than 1. For the transmission mode 3, the CQI value is based on the last report. The RI value is calculated, based on RI=1 for other transmission modes.

Second, Mode 1-1 (ie broadband CQI + single PMI reporting mode):

In the RI reporting subframe (only valid for transmission modes 4, 8, and 9): The UE needs to report a Type 3 report containing an RI value;

In the RI and the first PMI (first PMI) reporting subframe (only for transmission mode 9 in submode 1 (submode 1) and 8 CSI-RS (Channel State Information-Reference Signal) signal) Valid in the case of the port): The UE reports a Type 5 report containing the joint coding information of the RI value and the first PMI value; in the 4 subframes on the CQI and the PMI: the UE selects a PMI value from the codebook subset, and determines one Broadband

CQI value, which is assumed to be calculated using all of the selected single PMI values in all subbands. When RI>1, the CQI value further includes a 3-bit wideband spatial differential CQI value, indicating codeword 1 The difference between the CQI value and the CQI value of the code 0. For the transmission modes 4, 8, and 9, the CQI value is calculated based on the last reported RI value, and for other transmission modes, the calculation is based on RI=1; The situation is reported in the Type 2/2b/2c report:

For transmission modes 4 and 8: report a Type 2 ^ report including the above-mentioned wideband CQI value and a selected second PMI (second PMI) value;

For the transmission mode 9 configured in the submodel, the Type2b report including the above-mentioned broadband CQI value and a selected second PMI value is reported;

For the transmission mode 9 configured in submode2, the Type 2c 4 report including the above-mentioned wideband CQI value and the first PMI value and the second PMI value determined according to the single PMI selected above is reported.

Third, Mode 2-0 (ie sub-band CQI reporting mode, no PMI):

In the RI reporting subframe (only valid for transmission mode 3): The UE needs to report a Type 3 report containing an RI value; In the CQI reporting subframe: The UE needs to report a Type 4 report containing a wideband CQI value, regardless of the RI value. Whether it is greater than 1, the Type 4 report only contains the CQI value of codeword 0; for transmission mode 3, the CQI value is calculated based on the last reported RI value, and for other transmission modes, based on RI=1;

In the 4 subframes on the CQI of the selected subband: in each J bandwidth portion, the UE should select a preferred subband in the subband set containing Nj subbands, and report a CQI value including the preferred subband and The Type 1 · ί of the L-bit flag of the preferred sub-band, this CQI value only reflects the transmission on the selected sub-band in the bandwidth portion determined in the previous step, and the Type 1 report for each bandwidth portion will be The consecutive reporting timings are sequentially reported in round robin. Regardless of whether the RI value is greater than 1, the Type l report only contains the CQI value of the codeword 0. For the transmission mode 3, the selection of the preferred subband and the CQI value of the subband are based on the last time. The reported RI value is calculated, and for other transmission modes, it is calculated based on RI=1.

The fourth, Mode 2-1 (ie sub-band CQI + PMI reporting mode):

In the RI reporting subframe (if the number of ports of the CSI-RS is configured as 2 or 4, it is valid only for transmission modes 4, 8, and 9): The UE needs to report a Type 3 report containing an RI value;

In the RI reporting subframe in which the transmission mode 9 of the 8-port CSI-RS is configured: the UE reports a Type 6 report including an RI value and a PTI value;

In the wideband CQI and PMI reporting subframes: The UE selects a PMI value from the codebook subset, and further reports the CQI value and the PMI value according to the following conditions:

For transmission modes other than transmission mode 9: The UE shall report a Type 2 report, including: a wideband CQI value, which is assumed to be calculated using the selected single PMI value in all subbands, and one The selected wideband PMI (wideband PMI) value; when RI>1, a 3-bit wideband spatial difference is also included. CQI value;

For transmission mode 9: When PTI=0, the UE needs to report a Type2a report containing a selected first threshold; when PTI=1 or CSI-RS port is 2 or 4, the UE needs to upload a Type2b report. , including: a wideband CQI value, which is assumed to be calculated using the selected single PMI value in all subbands, and a selected second PMI value, when RI>1, including one 3-bit wideband spatial differential CQI value;

For transmission modes 4, 8, and 9, the CQI value is calculated based on the last reported RI value, and for other transmission modes, calculation is based on RI=1;

In the CQI reporting subframe of the selected sub-band: In each J bandwidth portion, the UE should select a preferred sub-band in the sub-band set containing Nj sub-bands, and further report the CQI value and the PMI value according to the following conditions:

For the transmission mode other than the transmission mode 9 in which the 8-port CSI-RS is configured: The UE sends a Typel report for each bandwidth part at each independent continuous reporting occasion, including: CQI value of the codeword 0 in the preferred subband And the L-bit flag of the preferred sub-band, the CQI value only reflects the transmission condition on the selected sub-band in the bandwidth portion determined in the previous step, and when RI>1, the sub-band spatial differential CQI value of the additional 3 bits is also included , representing a difference value between the sub-band CQI value of codeword 1 and the sub-band CQI value of codeword 0, and assuming that all sub-bands are calculated using the last reported single PMI value;

For the transmission mode 9 configured with 8-port CSI-RS: When PTI=0, the UE needs to report a Type2b report on each successive reporting opportunity, including: a wideband CQI value, which is assumed in all subbands. Both use a single PMI value to calculate, and a second PMI value selected from the codebook subset. When RI>1, a 3-bit wideband spatial differential CQI value is also included;

For transmission mode 9: When PTI=1, the UE sends one for each bandwidth part at each independent continuous time.

The Typela report includes: a CQI value of the codeword 0 in the preferred subband, and an L bit flag of the preferred subband, the CQI value only reflecting the transmission condition on the selected subband in the bandwidth portion determined in the previous step, when RI >1, an additional 3-bit subband spatial difference CQI value is also included, and is assumed to be calculated using the last reported single PMI value in all subbands, and a second PMI value selected from the codebook subset;

For transmission modes 4, 8 and 9, the preferred subband selection and subband CQI values are calculated based on the last reported RI value, and for other transmission modes, based on RI=1.

In summary, in the above four CSI reporting modes, 10 kinds of CSI types (Reporting Type) as shown in Table 1 are defined. In an uplink subframe, one carrier only has one Type in Table 1. Therefore, the maximum CSI feedback bit number of one carrier is 11 bits (where, for the subband CQI mode, the subband index L is at most 2). Bit). The transmission of periodic CSI in the LTE-ARel-10 system uses the PUCCH format (format) 2/2a/2b, and its maximum transmission capacity is 13 bits. Therefore, the Rel-10 system only supports feedback of one downlink carrier in one subframe. CSI. If there are multiple carriers in the current subframe, and the CSI needs to be fed back, the carrier with the highest Type priority is selected according to the Type priority, and the CSI corresponding to the carrier is the Type with the highest priority. Types 3, 5, 6 , 2a, second For Types 2, 2b, 2c, 4, the lowest priority is Types 1, la. If multiple carriers have the same high priority type at the same time, the CSI of the carrier reporting the minimum carrier number is selected according to the carrier number.

Table 1: The number of bits on each PUCCH CSI

PUCCH reporting mode

Mode Mode Mode Mode Reporting Type Reporting Mode Mode Status

1-1 2-1 1-0 2-0

(bits/BP) (bits/BP) (bits/BP) (bits/BP)

Sub-band RI = 1 NA 4+L NA 4+L

1

CQI RI > 1 NA 7+L NA 4+L

8 antenna ports RI = 1 NA 8+L NA NA

Sub-band

8 antenna ports 1 < RI

La CQI /

< 5 NA 9+L NA NA second PMI

8 antenna ports RI > 4 NA 7+L NA NA

2 antenna ports RI = 1 6 6 NA NA

Wideband 4 antenna ports RI = 1 8 8 NA NA

2

CQI/PMI 2 antenna ports RI > 1 8 8 NA NA

4 antenna ports RI > 1 11 11 NA NA

8 antenna ports RI < 3 NA 4 NA NA

Wideband 8 antenna ports 2 < RI

2a

First PMI < 8 NA 2 NA NA

8 antenna ports RI = 8 NA 0 NA NA

8 antenna ports RI = 1 8 8 NA NA

Wideband 8 antenna ports 1 < RI

2b CQI / < 4 11 11 NA NA second PMI 8 antenna ports RI = 4 10 10 NA NA

8 antenna ports RI > 4 7 7 NA NA

8 antenna ports RI = 1 8 - NA NA

Wideband 8 antenna ports 1 < RI

CQI 1 first < 4 11 - NA NA

2c

PMI 1 8 antenna ports 4 < RI

Second PMI < 7 9 - NA NA

8 antenna ports RI = 8 7 - NA NA

2-layer spatial

3 RI

Multiplexing 1 1 1 1 4-layer spatial

Multiplexing 2 2 2 2

8-layer spatial

Multiplexing 3 3 NA NA

Wideband

4 RI = 1 or RI>1 NA NA 4 4 CQI

8 antenna ports,

2-layer spatial 4

RI/ first multiplexing

5 NA NA NA PMI 8 antenna ports, 4 and

8-layer spatial 5

Multiplexing

8 antenna ports,

2-layer spatial NA 2 NA NA multiplexing

6 8 antenna ports,

RI/PTI 4-layer spatial NA 3 NA NA multiplexing

8 antenna ports,

8-layer spatial NA 4 NA NA multiplexing

Where antenna ports are antenna ports. The spatial multiplexing is spatial multiplexing, the layer is the number of transmission layers, and NA indicates that the reporting type is not supported in the corresponding mode.

In addition, in the LTE-A Rel-10 CA system, for a UE configured with multiple carriers, if only the primary carrier

(Primary Cell , Pcell ) If the data is received, the Rel-8/9 behavior is followed, that is, according to the configuration of the high-level parameter simultaneousAckNackAndCQI, whether or not to support the answer/no answer is determined.

Ac Ac Ac Ac Ac Ac Ac Ac Ac Ac Ac Ac Ac Ac Ac Ac Ac Ac Ac Ac Ac Ac Ac CP) transmits ACK/NACK and CSI at the same time. If it is not supported, the UE will drop the periodic CQI/PMI/RI and only feed back ACK/NACK. If data is received on multiple carriers, ACK/NACK and periodic CQI/ are not supported. The PMI/RI is transmitted simultaneously at the PUCCH. At this time, the UE always drops the periodic CQI/PMI/RI and only feeds back ACK/NACK _0.

In the process of implementing the present invention, the inventors have found that the following technical problems exist in the prior art: In the current LTE-A Rel-10 system, the UE cannot simultaneously perform periodic CSI on multiple downlink carriers in one uplink subframe, and the CSI of each carrier in the TDM mode can cause CSI feedback of some carriers. The period is large, and the feedback density of ACK/NACK and CSI in the LTE-A system is large. In the existing mechanism, the probability that the CSI is discarded and not reported is also large, so that the base station cannot obtain the CSI on these carriers in time. , thus affecting the accuracy of downlink scheduling. Summary of the invention

The embodiment of the invention provides a CSI transmission method and device, which are used to improve the accuracy of downlink scheduling.

A CSI transmission method, the method comprising:

The terminal determines a threshold of the number of CSI feedback bits in the current uplink subframe;

Determining, by the terminal, a total number of CSI feedback bits of the plurality of downlink carriers that need to feed back the CSI in the current uplink subframe; the terminal determining whether the total number of CSI feedback bits is greater than the CSI feedback bit number threshold; if yes, the The CSI that is fed back in the current uplink subframe is compressed, and the compressed CSI is fed back to the base station in the current uplink subframe; otherwise, the CSI of the multiple downlink carriers is fed back to the base station in the current uplink subframe.

A CSI receiving method, the method comprising:

Determining, by the base station, a threshold of a number of CSI feedback bits in the current uplink subframe of the terminal;

Determining, by the base station, that the terminal needs to feed back a total CSI bit number of multiple downlink carriers of the CSI in the current uplink subframe;

Determining, by the base station, whether the total number of CSI bits is greater than the CSI feedback bit number threshold; if yes, determining that the terminal compresses the CSI fed back in the current subframe, and determining that the terminal is in the current uplink The number of CSI bits actually fed back by the frame is the total number of CSI bits after the compression; otherwise, determining that the number of CSI bits actually fed back by the terminal in the current uplink subframe is the total number of CSI bits;

The base station decodes the CSI transmitted in the current uplink subframe according to the determined number of CSI bits actually fed back by the terminal in the current uplink subframe.

A terminal, the terminal comprising:

a determining module, configured to determine a CSI feedback bit number threshold in the current uplink subframe, and determine a total CSI feedback bit number of the plurality of downlink carriers that need to feed back the CSI in the current uplink subframe;

a processing module, configured to determine whether the total CSI feedback bit number determined by the determining module is greater than the CSI feedback bit number threshold; if yes, compress the CSI that needs to be fed back in the current uplink subframe, and The compressed CSI is fed back to the base station in the current uplink subframe; otherwise, the CSI of the multiple downlink carriers is simultaneously fed back to the base station in the current uplink subframe.

A base station, the base station comprising:

a determining module, configured to determine a CSI feedback bit number threshold of the terminal in the current uplink subframe, and determine a total CSI bit number of the plurality of downlink carriers that the terminal needs to feed back CSI in the current uplink subframe;

a determining module, configured to determine whether the total number of CSI bits determined by the determining module is greater than the CSI And determining, by the terminal, the CSI that is fed back in the current subframe, and determining that the number of CSI bits actually fed back by the terminal in the current uplink subframe is the compressed CSI total bit. The number of CSI bits actually measured by the terminal in the current uplink subframe is the total number of CSI bits;

The receiving module is configured to decode the CSI transmitted in the current uplink subframe according to the CSI bit number actually feedbacked by the terminal in the current uplink subframe determined by the determining module.

In the solution provided by the embodiment of the present invention, the terminal determines a CSI feedback bit threshold value in the current uplink subframe, and a total CSI feedback bit number of multiple downlink carriers that need to feed back CSI in the current uplink subframe, and then determines the Whether the total CSI feedback bit number is greater than the CSI feedback bit number threshold; if yes, compressing the CSI that needs to be fed back in the current uplink subframe, and feeding back the compressed CSI to the base station in the current uplink subframe; otherwise, The CSI of the multiple downlink carriers is fed back to the base station in the current uplink subframe. It can be seen that the present invention can adaptively determine whether the CSI needs to be compressed according to whether the total number of bits of the CSI of the multi-carrier exceeds the upper limit of the CSI transmission of the transmission scheme, and transmit as many downlinks as possible without exceeding the CSI transmission upper limit. The CSI of the carrier is used to improve the transmission efficiency of the CSI, so that the base station can obtain the CSI of the multi-carrier in time, and improve the accuracy of the downlink scheduling.

DRAWINGS

1 is a schematic diagram of a carrier aggregation system in the prior art;

2 is a schematic flowchart of a method according to an embodiment of the present invention;

3 is a schematic flowchart of another method according to an embodiment of the present invention;

4 is a schematic structural diagram of a device according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of another device according to an embodiment of the present invention.

detailed description

In order to improve the accuracy of the downlink scheduling, the embodiment of the present invention provides a CSI transmission method. In this method, the total number of CSI feedback bits of multiple downlink carriers that need to feed back CSI in the current uplink subframe is greater than the current uplink. When the CSI feedback bit number threshold in the frame is used, the CSI that needs to be fed back in the current uplink subframe is compressed and transmitted; and when the number of CSI feedback bits of the multiple downlink carriers that need to feed back the CSI in the current uplink subframe is not greater than When the CSI feedback bit number threshold in the current uplink subframe is transmitted, the CSIs of the multiple downlink carriers are simultaneously transmitted.

Referring to FIG. 2, a CSI transmission method provided by an embodiment of the present invention includes the following steps:

Step 20: The terminal determines a CSI feedback bit threshold in the current uplink subframe, and determines a total CSI feedback bit number of multiple downlink carriers that need to feed back the CSI in the current uplink subframe.

Step 21: The terminal determines whether the total CSI feedback bit number is greater than the CSI feedback bit number threshold; if yes, compresses the CSI that needs to be fed back in the current uplink subframe, and feeds back to the base station in the current uplink subframe. The compressed CSI; otherwise, the CSI of the multiple downlink carriers is fed back to the base station in the current uplink subframe.

Specifically, in step 20, the CSI feedback bit number threshold is obtained by the terminal through high-layer signaling or physical downlink control channel (PDCCH) signaling; or The threshold of the CSI feedback bit number is pre-agreed by the terminal and the base station; or

The CSI feedback bit number threshold is determined by the terminal according to a Physical Uplink Control Channel (PUCCH) format used by the CSI to transmit; or

The CSI feedback bit number threshold is a PUCCH format used by the terminal to transmit simultaneously with a positive acknowledgement (ACK)/negative acknowledgement (NACK) and/or a scheduling request (SR) according to CSI, and the same uplink with CSI. The number of bits of the ACK/NACK and/or SR transmitted simultaneously by the subframe is determined. For example, the CSI feedback bit number threshold is determined by the terminal according to the PUCCH format used for CSI and ACK/NACK simultaneous transmission, and the number of bits of ACK/NACK transmitted simultaneously with the CSI in the same uplink subframe; for example, The threshold of the number of CSI feedback bits is determined by the number of bits of the PUCCH format used by the terminal to transmit simultaneously with the CSI and the SR, and the number of bits of the SR that are simultaneously transmitted by the CSI in the same uplink subframe; for example, the number of CSI feedback bits The threshold is determined by the terminal according to the PUCCH format used for CSI and ACK/NACK and SR simultaneous transmission, and the number of bits of ACK/NACK and SR transmitted simultaneously with the CSI in the same uplink subframe.

Further, the CSI feedback bit number threshold is any integer that does not exceed the maximum number of transmission bits A of the PUCCH format used for transmitting the CSI; or

The CSI feedback bit number threshold is any integer that does not exceed AK bits, where A is the maximum number of transmission bits of the PUCCH format used for simultaneous transmission of CSI and ACK/NACK and/or SR, and K is on the same uplink as CSI. The number of ACK/NACK and/or SR bits transmitted simultaneously in a subframe. For example, A is the maximum number of transmission bits of the PUCCH format used for simultaneous transmission of CSI and ACK/NACK, and K is the number of bits of ACK/NACK transmitted simultaneously with the CSI in the same uplink subframe; for example, A is CSI and SR Simultaneous transmission of the maximum number of transmission bits of the PUCCH format used, K is the number of bits of the SR transmitted simultaneously with the CSI in the same uplink subframe; for example, A is the PUCCH format used for simultaneous transmission of CSI and ACK/NACK and SR. The maximum number of transmission bits, K is the number of ACK/NACK and SR bits transmitted simultaneously with the CSI in the same uplink subframe.

In step 20, the terminal determines the total number of CSI bits of multiple downlink carriers that need to be fed back in the current subframe, and the specific implementation may be as follows:

Determining, by the terminal, the CSI reporting type of each downlink carrier in the multiple downlink carriers, on the corresponding downlink carrier

The number of CSI feedback bits, the sum of the number of CSI feedback bits on each downlink carrier, is the total number of CSI bits that need to be fed back in the current subframe.

In step 21, the terminal compresses the CSI that needs to be fed back in the current uplink subframe, and the specific implementation may be as follows:

The terminal feeds back the priority of each downlink carrier of the CSI in the current uplink subframe and/or the priority of the CSI on the downlink carrier in the current uplink subframe, and needs to feed back the CSI in the current uplink subframe. The CSI of a part of the downlink carriers of the plurality of downlink carriers is discarded, so that the total number of bits of the remaining CSI is not greater than the CSI feedback bit number threshold, and the remaining CSI is taken as the compressed CSI. According to the priority of the downlink carrier and the priority of the CSI reporting type The combination between the two methods may include, but is not limited to, the following four methods:

In a first method, the terminal feeds back the priority of each downlink carrier in the plurality of downlink carriers of the CSI in the current uplink subframe, and the CSI needs to be fed back in the current uplink subframe according to the downlink carrier priority from low to high. The CSI of the low-priority downlink carrier of the multiple downlink carriers is discarded, so that the total number of bits of the remaining CSI is not greater than the CSI feedback bit number threshold, and the remaining CSI is used as the compressed CSI;

In the second method, the terminal feeds back the priority of the CSI reporting type of each downlink carrier of the CSI in the current uplink subframe according to the need, and the priority of the CSI reporting type is from low to high, and the current uplink is required. The CSI of the downlink carrier with the low priority CSI reporting type among the multiple downlink carriers that feed back the CSI in the frame is discarded, so that the total number of bits of the remaining CSI is not greater than the threshold of the CSI feedback bit number, and the remaining CSI is used as the compressed CSI; if the CSI reporting type of the remaining downlink carriers belongs to the same priority, and the total number of bits of the CSI of the remaining downlink carriers still exceeds the CSI feedback bit threshold, the terminal further according to the remaining The priority of the downlink carrier is discarded, and the CSI of the low-priority downlink carrier in the remaining downlink carriers is discarded in the order of the downlink carrier priority from low to high, so that the total number of remaining CSIs is not greater than the CSI. Feedback threshold number threshold, and the remaining CSI as the compressed CSI;

In the third method, the terminal feeds back the downlink carriers of the multiple downlink carriers of the CSI in the current uplink subframe as needed.

The priority of the CSI type will be required to be grouped into a group of downlink carriers having the same CSI on the CSI multiple downlink carriers in the current uplink subframe, for each CSI. The downlink carriers in the downlink carrier group corresponding to the priority of the type are discarded according to the priority of the downlink carrier, and the CSI of the low-priority downlink carrier is discarded in the order of the downlink carrier priority from low to high, so that the total of the remaining CSIs is discarded. The number of bits is not greater than the CSI feedback bit number threshold, and the remaining CSI is used as the compressed CSI; if there is at most one downlink carrier in the downlink carrier group corresponding to each CSI type priority, and If the total number of CSIs of the remaining downlink carriers still exceeds the CSI feedback bit threshold, the terminal further performs the remaining according to the priority of the CSI reporting type according to the priority of the CSI reporting type from low to high. The CSI of the downlink carrier with the low priority CSI reporting type in the downlink carrier is discarded, so that the total number of remaining CSI bits is not greater than the CSI inverse Feeding the number of bits threshold, and using the remaining CSI as the compressed CSI;

In a fourth method, the terminal feeds back the priority of the CSI on the downlink carrier of the CSI in the current uplink subframe, and needs to feed the CSI in the downlink subframe in the current uplink subframe. The downlink carriers having the same CSI reporting type priority are grouped into one group, and the downlink carrier group corresponding to the low priority CSI type is selected according to the order of the CSI reporting type priority from low to high, and the low priority is selected. The downlink carrier in the downlink carrier group corresponding to the level CSI · 艮艮 type discards the CSI of the low priority downlink carrier according to the priority of the downlink carrier according to the downlink carrier priority from low to high, so that the remaining CSI is discarded. The total number of bits is not greater than the CSI feedback bit number threshold, and the remaining CSI is taken as the compressed CSI.

Specifically, a priority of each downlink carrier in the multiple downlink carriers is predefined in the system (UE and base The station is pre-agreed; or, configured for higher layer signaling or PDCCH signaling; or, determined according to the number of the corresponding downlink carrier.

The priority of the CSI reporting type of each of the plurality of downlink carriers is predefined in the system (pre-defined by the UE and the base station); or configured for high layer signaling or PDCCH signaling; or, according to The CSI information type corresponding to the CSI report type is determined.

In step 21, the terminal may feed back the CSI to the base station through the PUCCH or the Physical Uplink Shared CHannel (PUSCH).

The PUCCH format used in the present invention may be: PUCCH format 2, or PUCCH format 2a, or PUCCH format 2b, or PUCCH format 3.

The CSI in the present invention may include: one or any combination of CQI information, PMI information, RI information, PTI information.

Referring to FIG. 3, an embodiment of the present invention further provides a CSI receiving method, where the method includes:

Step 30: The base station determines a threshold of a CSI feedback bit number of the terminal in the current uplink subframe, and determines that the terminal needs to feed back a total number of CSI bits of multiple downlink carriers of the CSI in the current uplink subframe.

Step 31: The base station determines whether the total CSI bit number is greater than the CSI feedback bit number threshold; if yes, determining that the terminal compresses the CSI fed back in the current subframe, and determining that the terminal is currently uplinking The number of CSI bits actually fed back by the subframe is the total number of CSI bits after the compression; otherwise, determining that the number of CSI bits actually fed back by the terminal in the current uplink subframe is the total number of CSI bits;

Step 32: The base station receives the CSI fed back by the terminal according to the determined number of CSI bits actually received by the terminal in the current uplink subframe.

Specifically, in step 30, the CSI feedback bit number threshold is determined by the base station itself, and is configured to the terminal by using high layer signaling or physical downlink control channel PDCCH signaling; or

The threshold of the CSI feedback bit number is pre-agreed by the base station and the terminal; or

The CSI feedback bit number threshold is determined by the base station according to the PUCCH format used by the terminal to transmit CSI; or

The CSI feedback bit number threshold is an ACK/NACK and/or that is transmitted by the base station according to CSI, ACK/NACK, and/or SR simultaneous transmission of the terminal and CSI in the same uplink subframe. The number of bits of the SR is determined.

The CSI feedback bit number threshold is any integer that does not exceed AK bits, where A is the maximum transmission bit number of the CIC and ACK/NACK and/or the PUCCH format used by the SR, and K is in the same uplink subframe as the CSI. The number of ACK/NACK and/or SR bits transmitted simultaneously. In step 30, the base station determines the total number of CSI bits of the plurality of downlink carriers that the terminal needs to feed back CSI in the current uplink subframe, and the specific implementation may be as follows:

The base station determines, according to the CSI reporting type of each downlink carrier of the multiple downlink carriers, the number of CSI feedback bits on the corresponding downlink carrier, and the sum of the number of CSI feedback bits on each downlink carrier, that is, the terminal needs to be in the current subframe. The total number of CSI bits in the feedback.

In step 31, the method for determining the total number of CSI bits after compression may be as follows:

The base station needs to prioritize the priority of each downlink carrier and/or the priority of the CSI reporting type of each downlink carrier, which is required by the terminal to feed back the CSI in the current uplink subframe, and the terminal needs to be in the current uplink. The CSI of the downlink carriers of the plurality of downlink carriers that are fed back to the CSI in the subframe is discarded, so that the total number of CSI bits of the remaining downlink carriers is not greater than the CSI feedback bit number threshold, and the total number of CSI bits of the remaining downlink carriers is As the total number of CSI bits after compression. The combination of the priority of the downlink carrier and the priority of the CSI reporting type may include, but is not limited to, the following four methods:

In a first method, the base station needs to forward the priority of each downlink carrier in the plurality of downlink carriers of the CSI in the current uplink subframe according to the terminal, and the terminal needs to be in the order of the downlink carrier priority from low to high. The CSI of the low-priority downlink carriers of the plurality of downlink carriers that are fed back to the CSI in the current uplink subframe is discarded, so that the total number of bits of the remaining CSI is not greater than the threshold of the CSI feedback bit number, and the remaining total number of CSI bits is used as The total number of CSI bits after compression;

In the second method, the base station according to the priority of the CSI reporting type of each downlink carrier in the downlink subframes that the terminal needs to feed back CSI in the current uplink subframe, according to the order of the CSI reporting type priorities from low to high, The terminal needs to discard the CSI of the downlink carrier with the low priority CSI reporting type among the multiple downlink carriers that feed back the CSI in the current uplink subframe, so that the total number of bits of the remaining CSI is not greater than the threshold of the CSI feedback bit number. And the total number of remaining CSI bits is used as the total number of bits of the compressed CSI; if the CSI reporting types of the remaining downlink carriers belong to the same priority, and the total number of CSIs of the remaining downlink carriers still exceeds the CSI The base station further discards the CSI of the low priority downlink carrier in the remaining downlink carriers according to the priority of the remaining downlink carriers according to the priority of the remaining downlink carriers, in descending order of the downlink carrier priorities. The total number of bits of the remaining CSI is not greater than the CSI feedback bit number threshold, and the remaining CSI total ratio is again As the total number of bits after compression CSI number;

In a third method, the base station needs to forward the CSI on the downlink carrier of the CSI in the current uplink subframe according to the priority of the terminal, and the terminal needs to be in the current uplink subframe. The downlink carriers having the same CSI reporting type priority among the multiple downlink carriers of the CSI are grouped into one group, and the downlink carriers in the downlink carrier group corresponding to each CSI reporting type priority are according to the priority of the downlink carrier, according to the downlink carrier. The CSI of the low-priority downlink carrier is discarded in the order of the priority from low to high, so that the total number of bits of the remaining CSI is not greater than the threshold of the CSI feedback bit number, and the remaining total number of CSI bits is used as the compressed CSI total number of bits; if each CSI is described Up to one downlink carrier in the downlink carrier group corresponding to the priority of the reporting type, and the remaining downlink carriers

The total number of bits of the CSI still exceeds the CSI feedback bit threshold, and the base station further performs the remaining according to the priority of the CSI type according to the priority of the CSI type, the order of priority from low to high. The CSI discarding of the downlink carrier of the 4 艮 type on the low-priority CSI in the downlink carrier is such that the total number of bits of the remaining CSI is not greater than the threshold of the CSI feedback bit number, and the remaining number of remaining CSI bits is used as the compressed Total number of CSI bits;

In a fourth method, the base station needs to forward the CSI on the downlink carrier of the CSI in the current uplink subframe according to the priority of the terminal, and the terminal needs to be in the current uplink subframe. The downlink carriers having the same CSI reporting type priority among the multiple downlink carriers of the CSI are grouped into one group, and the downlink carriers corresponding to the 4艮 type on the low priority CSI are selected according to the order of the CSI reporting type priorities from low to high. The downlink carrier in the downlink carrier group corresponding to the low-priority CSI reporting type is low-prioritized according to the priority of the downlink carrier according to the downlink carrier priority from low to high. The CSI of the downlink carrier of the level is discarded, so that the total number of bits of the remaining CSI is not greater than the threshold of the CSI feedback bit number, and the remaining CSI is taken as the compressed CSI.

Specifically, the priority of each downlink carrier in the multiple downlink carriers is predefined in the system (pre-defined by the base station and the UE); or configured for high layer signaling or PDCCH signaling; or The number of the downlink carrier is determined.

The priority of the CSI reporting type of each of the plurality of downlink carriers is pre-defined in the system (pre-defined by the base station and the UE); or configured for higher layer signaling or PDCCH signaling; or, according to The CSI information type corresponding to the CSI type is determined.

In step 32, the base station may receive the CSI through the PUCCH or the PUSCH.

In the method, the PUCCH format may be: PUCCH format 2, or PUCCH format 2a, or

PUCCH format 2b, or PUCCH format 3.

In the method, the CSI may include: one or any combination of CQI information, PMI information, RI information, and PTI information.

The interaction between the terminal side and the base station side is implemented as follows:

First, the terminal determines a CSI feedback bit number threshold in the current uplink subframe, and determines a total CSI feedback bit number of the plurality of downlink carriers that need to feed back CSI in the current uplink subframe; determining whether the total CSI feedback bit number is The SSI is greater than the CSI feedback bit threshold; if yes, the CSI that needs to be fed back in the current uplink subframe is compressed, and the compressed CSI is fed back to the base station in the current uplink subframe; otherwise, in the current uplink subframe The base station simultaneously feeds back CSIs of the multiple downlink carriers;

And determining, by the base station, a CSI feedback bit number threshold in the current uplink subframe, and determining a total CSI bit number of the plurality of downlink carriers that the terminal needs to feed back CSI in the current uplink subframe; determining the total CSI Whether the number of bits is greater than the CSI feedback bit number threshold; if yes, determining that the terminal compresses the CSI fed back in the current subframe, and determining that the number of CSI bits actually fed back by the terminal in the current uplink subframe is Compressed CSI The total number of bits; otherwise, it is determined that the number of CSI bits actually fed back by the terminal in the current uplink subframe is the total number of CSI bits; according to the number of CSI bits actually fed back by the terminal in the current uplink subframe, the current uplink The CSI transmitted in the subframe is decoded.

The invention will be specifically described below:

In the LTE-A CA system, when the UE aggregates multiple downlink carriers, the UE transmits the CSI according to the following manner: Step 1: The UE determines the CSI feedback bit number threshold according to the PUCCH format used by the CSI in the current subframe.

Here, the CSI feedback bit number threshold is related to the transmission capacity of the PUCCH format for transmitting CSI; may be any integer that does not exceed the transmission capacity; the value may be pre-agreed by the UE and the base station (predefined in the system) Or, configured for higher layer signaling or PDCCH signaling; or determined for the UE according to the PUCCH format used for transmitting CSI (according to the transmission capacity); or, for the UE, simultaneously transmitting according to CSI and ACK/NACK and/or SR The PUCCH format used (according to the transmission capacity) and the number of bits of ACK/NACK and/or SR transmitted simultaneously with the CSI in the same uplink subframe.

The PUCCH format may be PUCCH format 2/2a/2b/3 or extended PUCCH format 3, and other transmission schemes are not excluded;

For PUCCH format 2/2a/2b, the CSI feedback bit number threshold may be 12 or 13 bits;

For PUCCH format 3, the CSI feedback bit number threshold may be 20 or 21 bits;

Step 2: The UE determines the number of CSI feedback bits on each downlink carrier that needs to perform CSI feedback according to the CSI reporting type (Reporting Type) of each downlink carrier in the downlink carriers that need to perform CSI feedback in the current subframe, and then determines the number of CSI feedback bits on the downlink carrier that needs to perform CSI feedback. The total number of CSI feedback bits of multiple downlink carriers that need to feed back CSI in the current uplink subframe;

Step 3: The UE determines whether the total CSI feedback bit number is greater than the CSI feedback bit number threshold: if not greater than, the CSIs of the multiple downlink carriers are cascaded together, and the cascading is fed back to the base station in the current uplink subframe. If the CSI is greater, the CSI of the multiple downlink carriers needs to be compressed, and the compressed CSI is fed back to the base station in the current uplink subframe. The CSI of the multiple downlink carriers is compressed, and the following four methods may be used:

Method 1: According to the downlink carrier priority, the CSI of the downlink carrier with the higher priority is selected for transmission, and the CSI feedback information of the downlink carrier with the lower priority is discarded, until the total number of bits of the CSI feedback information does not exceed the CSI feedback bit. Number threshold

Preferably, the priority of the downlink carrier is defined by the downlink carrier number (Index), for example, the downlink carrier with the smallest downlink carrier number is the highest priority; or the downlink carrier priority is predefined in the system (that is, the UE and the base station pre-agreed Carrier priority); or, configure carrier priority through higher layer signaling or PDCCH signaling;

Method 2: According to the priority of the CSI reporting type, the CSI feedback information of the downlink carrier with the CSI reporting type with the higher priority is selected, and the CSI feedback information of the downlink carrier with the lower priority CSI reporting type is discarded. The total number of bits of the CSI feedback information does not exceed the CSI feedback bit number threshold; Preferably, the priority is defined according to the CSI information type transmitted in the reporting type; or the priority of the reporting type is predefined in the system (that is, the priority of the reporting type is pre-agreed by the UE and the base station); or, through high layer signaling or The PDCCH signaling configuration report type priority;

For example, the reporting type containing the RI information has the highest priority (such as Type 3, 5, 6), the second is the reporting type including the wideband CQI (such as Type 2, 2b, 2c, 4), and the second is the reporting type including the sub-band CQI ( Such as Type 1, 1a) or only the reporting type of PMI (such as Type 2a);

For example: The priority of the CSI reporting type in the system is: Types 3, 5, 6, 2a has the highest priority, followed by Types 2, 2b, 2c, 4, and the lowest priority is Types 1, la;

Method 3: Method 1 is combined with Method 2, and firstly, according to the method 2, the CSI feedback information of the downlink carrier having the low priority class 4艮 is discarded according to the priority of the CSI reporting type, when the CSI of the remaining downlink carrier is 4艮If the total number of bits of the CSI feedback information of the remaining downlink carriers exceeds the CSI feedback bit number threshold, the CSI of the downlink carrier with the lower carrier priority in the remaining downlink carriers is further discarded according to the method 1 Feedback information, until the total number of bits of the CSI feedback information does not exceed the CSI feedback bit number threshold;

Method 4: The method 1 is combined with the method 2, and the downlink carrier that needs to be fed back to the CSI is divided into several groups according to the priority of the CSI reporting type according to the method 2, for example, the reporting type is Types 3, 5 according to the priority of the reporting type. 6, 2a, the downlink carriers are grouped into one group, and the downlink carriers of the Types 2, 2b, 2c, and 4 are grouped into one group, and the downlink carriers of the Types 1 and 1 are grouped into one group; The method 1 is to discard the CSI feedback information of the downlink carrier with a lower carrier priority in each group until the total number of bits of the CSI feedback information does not exceed the threshold of the CSI feedback bit number; wherein the method 1 is used for each group, and the specific performance is as follows: The priority of the CSI reporting type is from low to high. Step 1 is used for the lower downlink carrier group of the plurality of downlink carrier groups after the above-mentioned grouping (that is, according to method 2, according to the CSI reporting type. Level, grouping the downlink carrier, and selecting a downlink carrier group corresponding to the CSI reporting type of the low priority; and then prioritizing the carrier in the group according to the method 1 The CSI feedback information of the lower-level downlink carrier is discarded, and the loop is repeated until the total number of bits of the CSI feedback information does not exceed the CSI feedback bit number threshold); or, the method 1 is used for the plurality of downlink carrier groups after the grouping (ie, First, according to method 2, according to the CSI type, the downlink carrier is grouped; then, for each downlink carrier group, according to method 1, the CSI feedback information of the downlink carrier with lower carrier priority in each group is discarded. , such a loop, until the total number of bits of the CSI feedback information does not exceed the CSI feedback bit number threshold), wherein if there is at most one downlink carrier in each group, and the total number of bits of the CSI feedback information of the remaining downlink carriers exceeds the CSI The feedback bit number threshold may be further used in the method 2, according to the priority of each group of carriers, preferentially discarding the CSI feedback information of the downlink carrier having the lower priority type, until the total of the CSI feedback information The number of bits does not exceed the CSI feedback bit number threshold;

It should be noted that the above four compression methods are merely examples, and the present invention does not exclude the use of other CSI compression schemes. The CSI includes one or any combination of CQI, PMI, RI, and PTI. It should be noted that the foregoing CSI generally refers to a periodic CSI. It should be noted that when there are both ACK/NACK and/or Scheduling Request (SR) in the uplink subframe in which the CSI is transmitted, the above method is also applicable, and can support multi-carrier CSI feedback information and ACK/NACK and / or SR joint encoding transmission, such as PUCCH format 2/2a/2b/3, or extended PUCCH format 3, or other schemes. The determining of the CSI feedback bit number threshold may be determined based on the ACK/NACK and/or the number of feedback bits K of the SR transmitted simultaneously with the CSI feedback information, that is, the maximum capacity of the scheme for transmitting CSI is A, then the CSI feedback bit The number threshold can be any positive integer that does not exceed the AK bit. For example, if there are both CSI and ACK/NACK in the current uplink subframe, and the number of ACK/NACK feedback bits defined in the system to be simultaneously transmitted with the CSI does not exceed 5 bits, if the current subframe is not an SR subframe, it is not used. For the subframe in which the scheduling request is transmitted, that is, K=5, and for PUCCH format 2/2a/2b, A=13, the CSI feedback bit number threshold may be defined as a positive integer of AK=8 or less, and for PUCCH format 3, A=21, the CSI feedback bit number threshold may be defined as a positive integer of AK=16 or less. If the current subframe is an SR subframe, that is, a subframe for transmitting a scheduling request, it is required to simultaneously transmit 1-bit SR information. That is, K=5+l=6, for PUCCH format 2/2a/2b, the CSI feedback bit number threshold may be defined as a positive integer of AK=7 or less, and for PUCCH format 3, the CSI feedback bit number threshold may be A positive integer defined as AK=15 or less than 15; for example, when the number of ACK/NACK feedback bits defined in the system for simultaneous transmission with CSI does not exceed 10 bits, for PUCCH format 3, A=21, if the current subframe is not SR subframe, that is, not a subframe for transmitting a scheduling request, that is, If K=10, the CSI feedback bit number threshold may be defined as 11. If the current subframe is an SR subframe, that is, a subframe for transmitting a scheduling request, it is required to simultaneously transmit 1-bit SR information, that is, K=10+l= Ll, then the CSI feedback bit number threshold can be defined as 10.

It should be noted that the foregoing high layer signaling may be Radio Resource Control (RRC) or Media Access Control (MAC) signaling.

It should be noted that the foregoing method is applicable not only to the transmission of the periodic CSI feedback information on the PUCCH, but also to the transmission of the periodic CSI feedback information on the PUSCH. The CSI feedback bit number threshold may be determined according to the PUCCH format used by the UE to transmit the CSI, or may be determined in advance according to the relevant configuration of the PUSCH or dynamically notified by the high layer signaling/PDCCH signaling.

It should be noted that the multi-carrier CSI transmission method in the foregoing LTE-A CA system can also be applied to a Coordinated Multi-Point Transmission (CoMP) scenario, and CSIs of multiple transmission points that need to be fed back in CoMP transmission. It can be equivalent to the CSI of the above multiple carriers.

Based on the same inventive concept, a terminal is also provided in the embodiment of the present invention. The principle of the terminal is similar to the CSI transmission method in the embodiment of the present invention. Therefore, the implementation of the terminal may refer to the implementation of the method, and the repeated description is not repeated.

Referring to FIG. 4, an embodiment of the present invention further provides a terminal, where the terminal includes:

a determining module 40, configured to determine a CSI feedback bit number threshold in a current uplink subframe, and determine a total CSI feedback bit number of multiple downlink carriers that need to feed back CSI in the current uplink subframe; The processing module 41 is configured to determine whether the total CSI feedback bit number determined by the determining module is greater than the CSI feedback bit number threshold; if yes, compress the CSI that needs to be fed back in the current uplink subframe, and The compressed CSI is fed back to the base station in the current uplink subframe; otherwise, the CSI of the multiple downlink carriers is simultaneously fed back to the base station in the current uplink subframe.

Further, the determining module 40 is specifically configured to:

Acquiring the CSI feedback bit number threshold by using high layer signaling or physical downlink control channel PDCCH signaling; or

Determining, according to a predetermined agreement between the terminal and the base station, a threshold of the CSI feedback bit number; or

The CSI feedback ratio threshold determined according to the physical uplink control channel PUCCH format format used by the CSI; or

Determining the CSI feedback according to the PUCCH format used for simultaneous transmission of the CSI with the acknowledgement ACK/negative acknowledgement NACK and/or the scheduling request SR and the number of bits of the ACK/NACK and/or SR simultaneously transmitted with the CSI in the same uplink subframe The number of bits threshold.

Further, the determining module 40 is further configured to:

Determining that the threshold of the CSI feedback bit number is not more than any integer of the maximum number of transmission bits A of the PUCCH format used for transmitting the CSI; or

Determining that the CSI feedback bit number threshold is any integer that does not exceed AK bits, where A is the maximum number of transmission bits of the PUCCH format used for CSI and ACK/NACK and/or SR simultaneous transmission, and K is the same as CSI. The number of ACK/NACK and/or SR bits transmitted simultaneously in the uplink subframe.

Further, the processing module 41 is configured to:

The priority of each downlink carrier in the plurality of downlink carriers that feed back the CSI in the current uplink subframe and/or the priority of the CSI on the downlink carrier in the current uplink subframe, and the CSI needs to be fed back in the current uplink subframe. The CSI of the downlink carriers of the plurality of downlink carriers is discarded, so that the total number of bits of the remaining CSIs is not greater than the CSI feedback bit number threshold, and the remaining CSI is used as the compressed CSI.

Further, the processing module 41 is configured to:

The priority of each downlink carrier in the plurality of downlink carriers of the CSI is fed back in the current uplink subframe according to the need, and the downlink carrier priorities are from low to high, and multiple downlink carriers that need to feed back CSI in the current uplink subframe are required. The CSI of the low-priority downlink carrier is discarded, so that the total number of bits of the remaining CSI is not greater than the threshold of the CSI feedback bit number, and the remaining CSI is used as the compressed CSI; or

According to the need to feed back the CSI of the CSIs of the downlink carriers in the current uplink subframe, the priorities of the CSIs of the downlink carriers are in the order of the CSI reporting type from low to high, and need to be in the current uplink subframe. The CSI of the downlink carrier with the low priority CSI reporting type of the multiple downlink carriers of the CSI is discarded, so that the total number of bits of the remaining CSI is not greater than the threshold of the CSI feedback bit number, and the remaining CSI is used as the compressed CSI. If the rest The CSI on the downlink carrier belongs to the same priority, and the total number of bits of the CSI of the remaining downlink carriers still exceeds the CSI feedback bit threshold, and further according to the priority of the remaining downlink carriers. And discarding the CSI of the low-priority downlink carrier in the remaining downlink carriers in an order that the downlink carrier priorities are from low to high, so that the total number of remaining CSIs is not greater than the CSI feedback bit threshold, and The remaining CSI is taken as the compressed CSI; or,

The priority of the CSI reporting type of each downlink carrier of the multiple downlink carriers that feed back the CSI in the current uplink subframe is required to be the same CSI in the multiple downlink carriers that need to feed back the CSI in the current uplink subframe. The downlink carriers of the type priority are grouped into one group, and the downlink carriers in the downlink carrier group corresponding to the priority of each CSI reporting type are based on the priority of the downlink carrier, and the low priority is in the order of the downlink carrier priority from low to high. The CSI of the downlink carrier of the level is discarded, so that the total number of bits of the remaining CSI is not greater than the threshold of the CSI feedback bit number, and the remaining CSI is taken as the compressed CSI; if each CSI is on the type priority If there is at most one downlink carrier in the corresponding downlink carrier group, and the total number of CSIs of the remaining downlink carriers still exceeds the CSI feedback bit threshold, the CSI reporting type priority is further according to the priority of the CSI reporting type. CSI of the downlink carrier having the low priority CSI reporting type among the remaining downlink carriers in order from low to high Discarding, such that the total number of bits of the remaining CSI is not greater than the threshold of the CSI feedback bit number, and the remaining CSI is used as the compressed CSI; or, multiple downlink carriers that feed back CSI in the current uplink subframe as needed The priority of the CSI reporting type of each downlink carrier is divided into a group, and the downlink carriers having the same CSI reporting type priority among the multiple downlink carriers that need to feed back the CSI in the current uplink subframe are grouped according to the CSI reporting type. The downlink carrier group corresponding to the 4艮 type on the low priority CSI is selected in the order of the low priority to the high priority, and the downlink carrier in the downlink carrier group corresponding to the 4艮 type on the low priority CSI is based on the priority of the downlink carrier. The CSI of the low-priority downlink carrier is discarded in the order of the downlink carrier priority from low to high, so that the total number of bits of the remaining CSI is not greater than the threshold of the CSI feedback bit number, and the remaining CSI is used as the compressed CSI.

Further, the processing module 41 is further configured to:

Determining a priority of each of the plurality of downlink carriers according to a pre-defined in the system; or determining, according to configuration information in the high layer signaling/PDCCH signaling, a priority of each downlink carrier in the multiple downlink carriers Level; or,

Determining a priority of each of the plurality of downlink carriers according to a number of the downlink carrier.

Further, the processing module 41 is further configured to:

Determining, according to a pre-defined in the system, a priority of a CSI reporting type of each downlink carrier of the multiple downlink carriers; or

Determining, according to the configuration information in the high layer signaling/PDCCH signaling, a priority of a CSI type of each of the plurality of downlink carriers; or

Determining, according to a CSI information type included in the CSI reporting type, each downlink carrier of the multiple downlink carriers The priority of the CSI report type.

Further, the processing module 41 is configured to: feed back CSI to the base station by using a PUCCH or a physical uplink shared channel PUSCH.

Further, the PUCCH format is: PUCCH format 2, or PUCCH format 2a, or PUCCH format 2b, or PUCCH format 3.

Further, the CSI includes: one or any combination of channel shield quantity indication CQI information, precoding matrix indication PMI information, rank indication RI information, precoding type indication PTI information.

Based on the same inventive concept, a base station is also provided in the embodiment of the present invention. The principle of the problem solved by the base station is similar to the CSI receiving method in the embodiment of the present invention. Therefore, the implementation of the base station may refer to the implementation of the method, and the repeated description is not repeated.

Referring to FIG. 5, an embodiment of the present invention further provides a base station, where the base station includes:

a determining module 50, configured to determine a CSI feedback bit number threshold of the terminal in the current uplink subframe, and determine a total CSI bit number of the multiple downlink carriers that the terminal needs to feed back CSI in the current uplink subframe;

The determining module 51 is configured to determine whether the total CSI bit number determined by the determining module is greater than the CSI feedback bit number threshold; if yes, determining that the terminal compresses the CSI fed back in the current subframe And determining, by the terminal, the number of CSI bits actually fed back by the terminal in the current uplink subframe is the total number of CSI bits after the compression; otherwise, determining that the number of CSI bits actually received by the terminal in the current uplink subframe is the total Number of CSI bits;

The receiving module 52 is configured to receive the CSI fed back by the terminal according to the number of CSI bits actually measured by the terminal in the current uplink subframe determined by the determining module.

Further, the determining module 50 is specifically configured to:

Determining the CSI feedback bit number threshold, and configuring the CSI feedback bit number threshold to the terminal by using high layer signaling or physical downlink control channel PDCCH signaling; or

Determining, according to a pre-arrangement of the base station and the terminal, the CSI feedback bit number threshold; or determining a threshold of the CSI feedback bit number according to a physical uplink control channel PUCCH format format used by the terminal to transmit CSI; or ,

And according to the CSI of the terminal and the acknowledgement ACK/negative acknowledgement NACK and/or the scheduling request SR, the used PUCCH format and the number of bits of the ACK/NACK and/or SR transmitted simultaneously with the CSI in the same uplink subframe, Determining the CSI feedback bit number threshold.

Further, the determining module 50 is further configured to:

Determining that the CSI feedback bit number threshold is any integer that does not exceed AK bits, where A is the maximum number of transmission bits of the PUCCH format used for CSI and ACK/NACK and/or SR simultaneous transmission, and K is the same as CSI The number of ACK/NACK and/or SR bits transmitted simultaneously in one uplink subframe.

Further, the determining module 51 is configured to:

The terminal needs to be in the current uplink subframe according to the priority of each of the downlink carriers that are required to feed back the CSI in the current uplink subframe and/or the priority of the CSI reporting type of each downlink carrier. The CSI of the downlink carrier of the plurality of downlink carriers of the CSI is discarded, so that the total number of CSI bits of the remaining downlink carriers is not greater than the CSI feedback bit number threshold, and the total number of CSI bits of the remaining downlink carriers is used. The total number of CSI bits after compression.

Further, the determining module 51 is configured to:

The terminal needs to feed back the priority of each downlink carrier in the plurality of downlink carriers of the CSI in the current uplink subframe, and the terminal needs to feed back in the current uplink subframe according to the downlink carrier priority from low to high. The CSI of the low-priority downlink carriers of the multiple downlink carriers of the CSI is discarded, so that the total number of bits of the remaining CSI is not greater than the CSI feedback bit number threshold, and the remaining CSI total bits are used as the compressed CSI total bits. Number; or,

According to the priority of the CSI reporting type of each of the downlink carriers that are required to feed back the CSI in the current uplink subframe, the terminal needs to be in the current order according to the CSI reporting type priority from low to high. The CSI of the downlink carrier with the low priority CSI reporting type among the multiple downlink carriers that feed back the CSI in the uplink subframe is discarded, so that the total number of bits of the remaining CSI is not greater than the threshold of the CSI feedback bit number, and the remaining CSI total The number of bits is the total number of bits of the CSI after compression; if the CSI reporting type of the remaining downlink carriers belongs to the same priority, and the total number of bits of the CSI of the remaining downlink carriers still exceeds the CSI feedback bit threshold, then further Determining, according to the priority of the remaining downlink carriers, the CSI of the low-priority downlink carriers in the remaining downlink carriers in order of the downlink carrier priorities from low to high, so that the total number of remaining CSIs is again Not more than the CSI feedback bit number threshold, and the remaining CSI total number of bits as the compressed CSI total bit ; Or,

The priority of the CSI reporting type of each downlink carrier of the plurality of downlink carriers that are required to feed back the CSI in the current uplink subframe, and the terminal needs to have the downlink carrier that feeds back the CSI in the current uplink subframe. The downlink carriers of the same CSI reporting type priority are grouped into groups, and the downlink carriers in the downlink carrier group corresponding to each CSI reporting type priority are according to the priority of the downlink carrier, and the downlink carrier priorities are in descending order. And discarding the CSI of the low-priority downlink carrier, so that the total number of bits of the remaining CSI is not greater than the CSI feedback bit number threshold, and the remaining CSI total number of bits is used as the compressed CSI total number of bits; If there is at most one downlink carrier in the downlink carrier group corresponding to the CSI type priority, and the total number of CSIs of the remaining downlink carriers still exceeds the CSI feedback bit threshold, further according to the CSI. The priority of the 艮 type, according to the order of the priority of the type 4 CXI from low to high, having the remaining downlink carriers The CSI of the 4 艮 type downlink carrier on the priority CSI is discarded, so that the total number of remaining CSI bits is not greater than the CSI feedback bit number threshold, and the remaining remaining CSI total bits are used as the compressed CSI total number of bits. Or,

CSI reporting type of each downlink carrier in multiple downlink carriers that feed back CSI in the current uplink subframe as needed Priority, the downlink carriers having the same CSI priority type in the plurality of downlink carriers that need to feed back the CSI in the current uplink subframe are grouped into one group, and the priority of the CSI reporting type is from low to high. The downlink carrier group corresponding to the low priority CSI type, the downlink carrier in the downlink carrier group corresponding to the low priority CSI type according to the priority of the downlink carrier, according to the downlink carrier The CSI of the low priority downlink carrier is discarded in the order of priority from low to high, such that the total number of bits of the remaining CSI is not greater than the CSI feedback bit number threshold, and the remaining CSI is taken as the compressed CSI.

Further, the determining module 51 is further configured to:

Determining a priority of each of the plurality of downlink carriers according to a pre-defined in the system; or determining, according to configuration information in the high layer signaling or the PDCCH signaling, a priority of each downlink carrier in the multiple downlink carriers Level; or,

Further, the determining module 51 is further configured to:

Determining, according to configuration information in the high layer signaling or the PDCCH signaling, each downlink carrier of the multiple downlink carriers

The priority of the CSI reporting type; or,

Determining a priority of a CSI reporting type of each downlink carrier of the multiple downlink carriers according to a CSI information type included in the CSI reporting type.

Further, the receiving module 52 is configured to: receive CSI by using a PUCCH or a physical uplink shared channel PUSCH.

In summary, the beneficial effects of the present invention include:

In the solution provided by the embodiment of the present invention, the terminal determines a CSI feedback bit threshold value in the current uplink subframe, and a total CSI feedback bit number of multiple downlink carriers that need to feed back CSI in the current uplink subframe, and then determines the Whether the total CSI feedback bit number is greater than the CSI feedback bit number threshold; if yes, compressing the CSI that needs to be fed back in the current uplink subframe, and feeding back the compressed CSI to the base station in the current uplink subframe; otherwise, The CSI of the multiple downlink carriers is fed back to the base station in the current uplink subframe. It can be seen that the present invention can adaptively determine whether the CSI needs to be compressed according to whether the total number of bits of the CSI of the multi-carrier exceeds the upper limit of the CSI transmission of the transmission scheme, and transmit as many downlinks as possible without exceeding the CSI transmission upper limit. The CSI of the carrier is used to improve the transmission efficiency of the CSI, so that the base station can obtain the CSI of the multi-carrier in time, and improve the accuracy of the downlink scheduling. The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the invention has been described, it will be apparent to those of ordinary skill in the art that <RTIgt; Therefore, the appended claims are intended to be construed as including the preferred embodiments and the modifications

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Rights request

A channel state information CSI transmission method, characterized in that the method comprises:

Determining, by the terminal, a total number of CSI feedback bits of multiple downlink carriers that need to feed back CSI in the current uplink subframe;

Determining, by the terminal, whether the total CSI feedback bit number is greater than the CSI feedback bit number threshold; if yes, compressing CSI that needs to be fed back in the current uplink subframe, and feeding back compression to the base station in the current uplink subframe The subsequent CSI; otherwise, the CSI of the multiple downlink carriers is fed back to the base station in the current uplink subframe.

2. The method of claim 1 wherein:

The CSI feedback bit number threshold is obtained by the terminal through high layer signaling or a physical downlink control channel PDCCH signal; or

The threshold of the CSI feedback bit number is pre-agreed by the terminal and the base station; or

The CSI feedback bit number threshold is determined by the terminal according to a physical uplink control channel PUCCH format used for transmitting CSI; or

The CSI feedback bit number threshold is a PUCCH format used by the terminal to simultaneously transmit a CSI with a positive acknowledgment ACK/negative acknowledgment NACK and/or a scheduling request SR, and an ACK/NACK that is simultaneously transmitted with the CSI in the same uplink subframe. / or the number of bits in the SR is determined.

3. The method of claim 2, wherein

The CSI feedback bit number threshold is any integer that does not exceed the maximum number of transmission bits A of the PUCCH format used for transmitting the CSI; or

The CSI feedback bit number threshold is any integer that does not exceed AK bits, where A is the maximum number of transmission bits of the PUCCH format used for simultaneous transmission of CSI and ACK/NACK and/or SR, and K is on the same uplink as CSI. The number of ACK/NACK and/or SR bits transmitted simultaneously in a subframe.

The method according to claim 1, wherein the terminal compresses the CSI that needs to be fed back in the current uplink subframe, including:

The terminal feeds back the priority of each downlink carrier in the plurality of downlink carriers of the CSI and/or the priority of the CSI on the downlink carrier in the current uplink subframe according to the need, and the required uplink in the current uplink The CSI of the downlink carriers of the plurality of downlink carriers that feed back the CSI in the frame is discarded, so that the total number of bits of the remaining CSI is not greater than the CSI feedback bit number threshold, and the remaining CSI is used as the compressed CSI.

The method according to claim 4, wherein the terminal feeds back the priority of each downlink carrier and/or the CSI reporting type of each downlink carrier in the plurality of downlink carriers of the CSI in the current uplink subframe as needed. The CSI of the downlink carrier of the plurality of downlink carriers that need to feed back the CSI in the current uplink subframe is discarded, so that the total number of bits of the remaining CSI is not greater than the threshold of the CSI feedback bit number, and the remaining CSI as compressed CSI, including:

The terminal feeds back the priority of each downlink carrier in the plurality of downlink carriers of the CSI in the current uplink subframe according to the requirement, and feeds back the CSI in the current uplink subframe according to the downlink carrier priority from low to high. The CSI of the low-priority downlink carrier of the multiple downlink carriers is discarded, so that the total number of bits of the remaining CSI is not greater than the CSI feedback bit number threshold, and the remaining CSI is used as the compressed CSI; or

The terminal feeds back the priority of the CSI reporting type of each downlink carrier of the plurality of downlink carriers of the CSI in the current uplink subframe according to the need, and the required priority is in the current uplink according to the order of the CSI reporting type priority from low to high. The CSI of the downlink carrier having the low priority CSI reporting type among the plurality of downlink carriers that feed back the CSI in the subframe is discarded, so that the total number of bits of the remaining CSI is not greater than the threshold of the CSI feedback bit number, and the remaining CSI is used as the compression. The CSI; if the CSIs of the remaining downlink carriers belong to the same priority, and the total number of CSIs of the remaining downlink carriers still exceeds the CSI feedback bit threshold, the terminal further The priority of the remaining downlink carriers is discarded according to the order in which the downlink carrier priorities are from low to high, so that the total number of remaining CSIs of the remaining downlink carriers is not Greater than the CSI feedback bit number threshold, and the remaining CSI is used as the compressed CSI; or

The terminal feeds back the priority of the CSI reporting type of each downlink carrier of the plurality of downlink carriers of the CSI in the current uplink subframe, and the same is needed for the multiple downlink carriers that need to feed back the CSI in the current uplink subframe. The downlink carriers of the CSI type-prioritized priority are grouped into one group, and the downlink carriers in the downlink carrier group corresponding to each CSI-type priority are classified according to the priority of the downlink carrier according to the downlink carrier priority. In a high order, the CSI of the low priority downlink carrier is discarded, such that the total number of bits of the remaining CSI is not greater than the CSI feedback bit number threshold, and the remaining CSI is taken as the compressed CSI; If there is at most one downlink carrier in the downlink carrier group corresponding to the CSI type priority, and the total number of CSIs of the remaining downlink carriers still exceeds the CSI feedback bit threshold, the terminal further reports according to the CSI. Priority of the type, having a low priority CSI among the remaining downlink carriers according to a CSI reporting type priority from low to high CSI reported type of downlink carriers discarded, so that the total number of bits available CSI again no greater than the remainder of the CSI feedback bit number threshold value, and the remaining as the CSI CSI again compressed; or

The terminal feeds back the priority of the CSI reporting type of each downlink carrier of the plurality of downlink carriers of the CSI in the current uplink subframe, and the same is needed for the multiple downlink carriers that need to feed back the CSI in the current uplink subframe. The downlink carriers of the CSI reporting type priority are grouped into one group, and the downlink carrier group corresponding to the low priority CSI type is selected according to the order of the CSI reporting type priority from low to high, and the low priority CSI is selected. The downlink carriers in the downlink carrier group corresponding to the upper 艮 type are discarded according to the priority of the downlink carrier, and the CSI of the low-priority downlink carrier is discarded in the order of the downlink carrier priority from low to high, so that the total of the remaining CSIs is discarded. The number of bits is not greater than the CSI feedback bit number threshold, and the remaining CSI is taken as the compressed CSI.

The method according to claim 4 or 5, wherein: each of the plurality of downlink carriers is downlink carrier Priority, which is predefined in the system; or configured for higher layer signaling or PDCCH signaling; or, determined according to the number of the corresponding downlink carrier.

The method according to claim 4 or 5, wherein the priority of the CSI reporting type of each of the plurality of downlink carriers is predefined in the system; or, the high layer signaling or the PDCCH The signaling is configured; or, determined according to the type of CSI information included in the CSI reporting type.

The method according to claim 1, wherein the terminal feeds back CSI to the base station through a PUCCH or a physical uplink shared channel PUSCH.

A channel state information CSI receiving method, characterized in that the method comprises:

The base station receives the CSI fed back by the terminal according to the determined number of CSI bits actually received by the terminal in the current uplink subframe.

10. The method of claim 9 wherein:

The CSI feedback bit number threshold is determined by the base station itself, and is configured to the terminal by using high layer signaling or physical downlink control channel PDCCH signaling; or

The CSI feedback bit number threshold is determined by the base station according to a physical uplink control channel PUCCH format used by the terminal to transmit CSI; or

The CSI feedback bit number threshold is a PUCCH format used by the base station to transmit simultaneously according to the CSI of the terminal and the acknowledgement ACK/negative acknowledgement NACK and/or the scheduling request SR, and simultaneously transmitted with the CSI in the same uplink subframe. The number of bits of ACK/NACK and/or SR is determined.

11. The method of claim 10, wherein

The method according to claim 9, wherein the method for determining the total number of CSIs after compression is determined Includes:

The base station needs to prioritize the priority of each downlink carrier and/or the priority of the CSI reporting type of each downlink carrier, which is required by the terminal to feed back the CSI in the current uplink subframe, and the terminal needs to be in the current uplink. The CSI of the downlink carriers of the plurality of downlink carriers that are fed back to the CSI in the subframe is discarded, so that the total number of CSI bits of the remaining downlink carriers is not greater than the CSI feedback bit number threshold, and the total number of CSI bits of the remaining downlink carriers is As the total number of CSI bits after compression.

The method according to claim 12, wherein the base station according to the priority of each downlink carrier and/or each downlink carrier of the plurality of downlink carriers that the terminal needs to feed back CSI in the current uplink subframe The CSI of the type of the downlink carrier that is required to feed back the CSI in the current uplink subframe is discarded, so that the total number of CSI bits of the remaining downlink carriers is not greater than The CSI feedbacks the number of bit thresholds, and uses the total number of CSI bits of the remaining downlink carriers as the total number of compressed CSI bits, including:

The base station needs to forward the priority of each downlink carrier in the plurality of downlink carriers of the CSI in the current uplink subframe according to the terminal, and the terminal needs to be in the current uplink according to the downlink carrier priority from low to high. Frame feedback

The CSI of the low-priority downlink carrier of the multiple downlink carriers of the CSI is discarded, so that the total number of bits of the remaining CSI is not greater than the CSI feedback bit number threshold, and the remaining CSI total bits are used as the compressed CSI total bits. Or the base station according to the CSI reporting type priority of each downlink carrier of the plurality of downlink carriers that the terminal needs to feed back CSI in the current uplink subframe, according to the order of CSI reporting type priority from low to high, The CSI discarding of the downlink carrier of the low priority CSI reporting type among the multiple downlink carriers that feed back the CSI in the current uplink subframe, so that the total number of bits of the remaining CSI is not greater than the threshold of the CSI feedback bit number And the total number of remaining CSI bits is taken as the total number of compressed CSI bits; if the remaining CSIs of the downlink carriers are of the same priority, and the total number of bits of the remaining downlink carriers is still If the CSI feedback bit threshold is exceeded, the base station further follows the downlink carrier priority according to the priority of the remaining downlink carriers. In a high order, the CSI of the low priority downlink carrier in the remaining downlink carriers is discarded, so that the total number of remaining CSI bits is not greater than the CSI feedback bit number threshold, and the remaining CSI total bits are again Number as the total number of CSI bits after compression; or,

The base station needs to feedback the priority of the CSI reporting type of each downlink carrier of the plurality of downlink carriers in the CSI in the current uplink subframe, and the terminal needs to feed back multiple downlinks of the CSI in the current uplink subframe. The downlink carriers having the same CSI-type priority in the carrier are grouped into one group, and the downlink carriers in the downlink carrier group corresponding to each CSI-type priority are classified according to the priority of the downlink carrier according to the downlink carrier. The CSI of the low-priority downlink carrier is discarded in the order of the priority from low to high, so that the total number of bits of the remaining CSI is not greater than the threshold of the CSI feedback bit number, and the remaining total number of CSI bits is used as the compressed a total number of CSI bits; if there is at most one downlink carrier in the downlink carrier group corresponding to the priority of each CSI reporting type, and the total number of CSIs of the remaining downlink carriers still exceeds the CSI feedback bit threshold, The base station further presses according to the priority of the CSI reporting type. The CSI of the downlink carrier having the 4艮 type on the low priority CSI is discarded in the order of the CSI uplink type priority from low to high, so that the total number of remaining CSI bits is not The value is greater than the CSI feedback bit number threshold, and the remaining CSI total number of bits is used as the total number of compressed CSI bits; or

The base station needs to feedback the priority of the CSI reporting type of each downlink carrier of the plurality of downlink carriers in the CSI in the current uplink subframe, and the terminal needs to feed back multiple downlinks of the CSI in the current uplink subframe. The downlink carriers having the same CSI reporting type priority in the carrier are grouped into one group, and the downlink carrier group corresponding to the 4艮 type on the low priority CSI is selected according to the order of the CSI reporting type priority from low to high. The downlink carrier in the downlink carrier group corresponding to the type of the CSI on the priority CSI is discarded according to the priority of the downlink carrier, and the CSI of the low priority downlink carrier is discarded in the order of the downlink carrier priority from low to high, so that the remaining CSI is discarded. The total number of bits is not greater than the CSI feedback bit number threshold, and the remaining CSI is taken as the compressed CSI.

The method according to claim 12 or 13, wherein the priority of each of the plurality of downlink carriers is predefined in the system; or, configured for higher layer signaling or PDCCH signaling Or, it is determined according to the number of the corresponding downlink carrier.

The method according to claim 12 or 13, wherein the priority of the CSI reporting type of each of the plurality of downlink carriers is predefined in the system; or, the high layer signaling or the PDCCH The signaling is configured; or, determined according to the type of CSI information included in the CSI reporting type.

The method according to claim 9, wherein the base station receives the CSI through a PUCCH or a physical uplink shared channel PUSCH.

17. A terminal, the terminal comprising:

The terminal according to claim 17, wherein the determining module is specifically configured to:

Determining, according to a physical uplink control channel PUCCH format used by the transmission CSI, the CSI feedback bit number threshold; or

According to the CSI, the PUCCH format used for simultaneous transmission of the acknowledgement ACK/negative acknowledgement NACK and/or the scheduling request SR, and the number of bits of the ACK/NACK and/or SR transmitted simultaneously with the CSI in the same uplink subframe are The CSI feedback bit number threshold is determined.

The terminal according to claim 18, wherein the determining module is further configured to: determine that the CSI feedback bit number threshold is not more than a maximum number of transmission bits A of a PUCCH format used for transmitting CSI. An integer; or,

Determining that the threshold of the number of CSI feedback bits is not more than any integer of A-K bits, where A is CSI and

ACK/NACK and/or SR simultaneously transmit the maximum number of transmission bits of the PUCCH format used, and K is the number of ACK/NACK and/or SR bits transmitted simultaneously with the CSI in the same uplink subframe.

The terminal according to claim 17, wherein the processing module is configured to:

The priority of each downlink carrier in the plurality of downlink carriers of the CSI and/or the priority of the CSI on the downlink carrier in the current uplink subframe is required, and the feedback needs to be fed back in the current uplink subframe. The CSI of some downlink carriers of the multiple downlink carriers of the CSI is discarded, so that the total number of bits of the remaining CSI is not greater than the CSI feedback bit number threshold, and the remaining CSI is taken as the compressed CSI.

The terminal according to claim 20, wherein the processing module is configured to:

The plurality of downlink carriers in the CSI are fed back in the current uplink subframe according to the priority of the downlink carrier, and the multiple CSIs are required to be fed back in the current uplink subframe according to the downlink carrier priority from low to high. The CSI of the low-priority downlink carrier in the downlink carrier is discarded, so that the total number of bits of the remaining CSI is not greater than the CSI feedback bit number threshold, and the remaining CSI is used as the compressed CSI; or

The priority of the 4th type of the CSI of each downlink carrier in the plurality of downlink carriers that feed back the CSI in the current uplink subframe is required, and the priority is in the current uplink according to the order of the CSI reporting type priority from low to high. The CSI of the downlink carrier with the low priority CSI reporting type among the multiple downlink carriers that feed back the CSI in the frame is discarded, so that the total number of bits of the remaining CSI is not greater than the threshold of the CSI feedback bit number, and the remaining CSI is used as the compressed CSI; if the remaining CSIs of the downlink carriers belong to the same priority, and the total number of bits of the CSI of the remaining downlink carriers still exceeds the CSI feedback bit threshold, further according to the remaining The CSI of the low-priority downlink carrier in the remaining downlink carriers is discarded, so that the total number of remaining CSIs is not greater than the CSI, in descending order of the downlink carrier priority. The number of feedback bits is thresholded, and the remaining CSI is taken as the compressed CSI; or

The priority of the CSI on each of the plurality of downlink carriers of the CSI is fed back in the current uplink subframe, and the same CSI is required in the multiple downlink carriers that need to feed back the CSI in the current uplink subframe. The downlink carriers of the priority type of the reporting type are grouped into one group, and the downlink carriers in the downlink carrier group corresponding to the priority of each CSI reporting type are lower according to the priority of the downlink carrier, in descending order of the downlink carrier priority. The CSI of the downlink carrier of the priority is discarded, so that the total number of bits of the remaining CSI is not greater than the threshold of the number of CSI feedback bits, and the remaining CSI is taken as the compressed CSI; if each CSI is preferentially typed At most one downlink carrier in the downlink carrier group corresponding to the level, and the total number of bits of the CSI of the remaining downlink carriers still exceeds the CSI feedback bit threshold, Further, according to the priority of the CSI reporting type, the CSI of the downlink carrier having the low priority CSI reporting type in the remaining downlink carriers is discarded in the order of the CSI reporting type priority from low to high, so that the remaining CSI is discarded again. The total number of bits is not greater than the CSI feedback bit number threshold, and the remaining CSI is taken as the compressed CSI; or

The CSI on the downlink carrier of the CSI is fed back in the current uplink subframe according to the priority of the CSI, and the plurality of downlink carriers that need to feed back the CSI in the current uplink subframe have the same The downlink carriers of the priority type of the CSI report are grouped into one group, and the downlink carrier group corresponding to the type of the lower priority CSI is selected according to the order of the priority of the CSI reporting type from low to high, and the low priority CSI is selected. The downlink carriers in the downlink carrier group corresponding to the type of the downlink carrier are discarded according to the priority of the downlink carrier, and the CSI of the low-priority downlink carrier is discarded in the order of the downlink carrier priority, so that the total number of remaining CSIs is discarded. Not more than the CSI feedback bit number threshold, and the remaining CSI is taken as the compressed CSI.

The terminal according to claim 20 or 21, wherein the processing module is further configured to: determine, according to a predefined definition in the system, a priority of each downlink carrier in the multiple downlink carriers; or, according to Determining, by the configuration information in the high layer signaling or the PDCCH signaling, a priority of each downlink carrier in the multiple downlink carriers; or

The terminal according to claim 20 or 21, wherein the processing module is further configured to: determine a priority of a CSI reporting type of each downlink carrier of the multiple downlink carriers according to a predefined definition in the system Or,

The priority of the CSI reporting type; or,

The CSI is fed back to the base station through the PUCCH or the physical uplink shared channel PUSCH.

25. A base station, the base station comprising:

a determining module, configured to determine whether the total CSI bit number determined by the determining module is greater than the CSI feedback bit number threshold; if yes, determining that the terminal compresses the CSI fed back in the current subframe, And determining, by the terminal, the number of CSI bits actually fed back by the terminal in the current uplink subframe is the total number of CSI bits after the compression; otherwise, determining that the number of CSI bits actually fed back by the terminal in the current uplink subframe is the total Number of CSI bits;

a receiving module, configured to determine, according to the determining module, a CSI ratio actually measured by the terminal in a current uplink subframe The special number receives the CSI fed back by the terminal.

The base station according to claim 25, wherein the determining module is specifically configured to:

Determining, according to a pre-arrangement of the base station and the terminal, the CSI feedback bit number threshold; or determining a threshold of the CSI feedback bit number according to a physical uplink control channel PUCCH format used by the terminal to transmit CSI; or

Transmitting the used PUCCH format according to the CSI of the terminal and the acknowledgement ACK/negative acknowledgement NACK and/or the scheduling request SR, and the number of bits of the ACK/NACK and/or SR simultaneously transmitted in the same uplink subframe as the CSI, Determining the CSI feedback bit number threshold.

The base station according to claim 26, wherein the determining module is further configured to:

Determining that the CSI feedback bit number threshold is not more than any integer of the maximum transmission bit number A of the PUCCH format used for transmitting the CSI; or

The base station according to claim 25, wherein the determining module is configured to:

The terminal needs to be in the current uplink subframe according to the priority of each of the downlink carriers that are required to feed back the CSI in the current uplink subframe and/or the priority of the CSI reporting type of each downlink carrier. The CSI of the downlink carrier of the plurality of downlink carriers of the CSI is discarded, so that the total number of CSI bits of the remaining downlink carriers is not greater than the threshold of the number of CSI feedback bits, and the total number of CSI bits of the remaining downlink carriers is used as a compressed The total number of CSI bits.

The base station according to claim 28, wherein the determining module is configured to:

According to the priority of the CSI reporting type of each of the downlink carriers that are required to feed back the CSI in the current uplink subframe, the terminal needs to be in the current order according to the CSI reporting type priority from low to high. The CSI of the downlink carrier with the low priority CSI reporting type among the multiple downlink carriers that feed back the CSI in the uplink subframe is discarded, so that the total number of bits of the remaining CSI is not greater than the threshold of the CSI feedback bit number, and the remaining CSI total The number of bits is the total number of bits of the CSI after compression; if the CSI reporting type of the remaining downlink carriers belongs to the same priority, and the total number of bits of the CSI of the remaining downlink carriers still exceeds the CSI feedback bit threshold, then further According to the remaining For the priority of the downlink carrier, the CSI of the low-priority downlink carrier in the remaining downlink carriers is discarded in the order of the downlink carrier priority from low to high, so that the total number of remaining CSI bits is not greater than The CSI feedback bit number threshold is used, and the remaining number of remaining CSI bits is used as the total number of compressed CSI bits; or

The priority of the CSI reporting type of each downlink carrier of the plurality of downlink carriers that are required to feed back the CSI in the current uplink subframe, and the terminal needs to have the downlink carrier that feeds back the CSI in the current uplink subframe. The downlink carriers of the same CSI reporting type priority are grouped into groups, and the downlink carriers in the downlink carrier group corresponding to each CSI reporting type priority are according to the priority of the downlink carrier, and the downlink carrier priorities are in descending order. And discarding the CSI of the low-priority downlink carrier, so that the total number of bits of the remaining CSI is not greater than the CSI feedback bit number threshold, and the remaining CSI total number of bits is used as the compressed CSI total number of bits; If there is at most one downlink carrier in the downlink carrier group corresponding to the CSI type priority, and the total number of CSIs of the remaining downlink carriers still exceeds the CSI feedback bit threshold, further according to the CSI. The priority of the 艮 type, according to the order of the priority of the type 4 CXI from low to high, having the remaining downlink carriers The CSI of the downlink carrier of the priority CSI is discarded, so that the total number of remaining CSI bits is not greater than the CSI feedback bit number threshold, and the remaining CSI total bits are used as the compressed CSI total bits. Number; or,

The priority of the 4th type of the CSI of each downlink carrier in the plurality of downlink carriers of the CSI is fed back in the current uplink subframe, and the terminal needs to have the same among the multiple downlink carriers that feed back the CSI in the current uplink subframe. The downlink carriers of the type 4 priority are classified into a group, and the downlink carrier group corresponding to the low priority CSI type is selected according to the order of the CSI reporting type priority from low to high, and the low priority is selected. The downlink carrier in the downlink carrier group corresponding to the level CSI · 艮艮 type discards the CSI of the low priority downlink carrier according to the priority of the downlink carrier according to the downlink carrier priority from low to high, so that the remaining CSI is discarded. The total number of bits is not greater than the CSI feedback bit number threshold, and the remaining CSI is taken as the compressed CSI.

The base station according to claim 28 or 29, wherein the determining module is further configured to: determine, according to a predefined definition in the system, a priority of each downlink carrier in the multiple downlink carriers; or, according to Determining, by the configuration information in the high layer signaling or the PDCCH signaling, a priority of each downlink carrier in the multiple downlink carriers; or

The base station according to claim 28 or 29, wherein the determining module is further configured to: determine a priority of a CSI reporting type of each downlink carrier of the multiple downlink carriers according to a predefined definition in the system Or,

The priority of the CSI reporting type; or,

Determining a priority of a CSI reporting type of each downlink carrier of the multiple downlink carriers according to a CSI information type included in the CSI reporting type. The base station according to claim 25, wherein the receiving module is configured to: receive CSI by using a PUCCH or a physical uplink shared channel (PUSCH).