KR102594361B1 - Method and apparatus for transmitting/receiving harq-ack in an enhanced carrier aggregation system - Google Patents

Abstract

The present invention discloses a method for transmitting a hybrid automatic repeat request acknowledgment (HARQ-ACK) in an enhanced carrier aggregation system, wherein a user equipment (UE) transmits a physical downlink control channel (PDCCH)/enhanced physical downlink transmission from a base station. receive a downlink control channel (EPDCCH) and a physical downlink shared channel (PDSCH); The UE releases the uplink downlink allocation index (UL DAI) obtained from the uplink grant (UL grant) and the downlink semi-persistent scheduling received in the HARQ-ACK bundling window. Physical uplink shared channel (PUSCH) of the current uplink subframe, based on the number of PDCCH/EPDCCH subframes and PDSCH subframes indicating, or based on the number of cells or transmission modes configured for the UE or determine the number of bits of HARQ-ACK feedback information of cells configured for the UE to be transmitted on a physical uplink control channel (PUCCH); Additionally, the UE transmits HARQ-ACK feedback information of all the cells on PUSCH or PUCCH of the current uplink subframe. By implementing the present invention, HARQ-ACK information can be appropriately fed back in a carrier aggregation (CA) system with multiple cells with different transmission modes and settings.

Description

Method and apparatus for transmitting and receiving an HARQ reception acknowledgment signal in a wireless communication system supporting carrier aggregation {METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING HARQ-ACK IN AN ENHANCED CARRIER AGGREGATION SYSTEM}

The present invention relates to wireless communication systems, and more particularly to a method and apparatus for transmitting a hybrid automatic repeat request acknowledgment (HARQ-ACK) in an improved carrier aggregation system.

Long term evolution (LTE) systems support two types of duplex: frequency division duplex (FDD) and time division duplex (TDD). Figure 1 is a frame structure of a TDD system. Each radio frame is 10 ms long and is equally divided into two half-frames, each 5 ms long. Each half-frame includes eight timeslots each of 0.5 ms in length and three specific fields: downlink pilot timeslot (DwPTS), guard period (GP), and uplink pilot timeslot (UpPTS). The total length of the three specific fields is 1ms. Each subframe consists of subframe k containing two consecutive timeslots, namely timeslot 2k and timeslot 2k+1. As shown in Table 1, the TDD system supports seven different TDD downlink and uplink configurations. In Table 1, “D” represents a downlink subframe, “U” represents an uplink subframe, and “S” represents a specific subframe containing three specific fields. Table 1 below shows an example of LTE TDD UL/DL settings.

setting switch-point cycle subframe number 0 One 2 3 4 5 6 7 8 9 0 5ms D S U U U D S U U U One 5ms D S U U D D S U U D 2 5ms D S U D D D S U D D 3 10ms D S U U U D D D D D 4 10ms D S U U D D D D D D 5 10ms D S U D D D D D D D 6 10ms D S U U U D S U U D

For a TDD system, as shown in Figure 2, the physical downlink shared channel (PDSCH) and the downlink quasi-fixed scheduling (SPS) release physical downlink control channel (PDCCH)/enhanced physical downlink control channel (EPDCCH) Since HARQ-ACK is transmitted in an uplink subframe, the number of downlink subframe(s) in which its HARQ-ACK is transmitted in an uplink subframe is referred to as the HARQ-ACK bundling window size.

For a TDD system, DL SPS release PDCCH/EPDCCH for PDSCH scheduling and DL downlink downlink control information (DCI) included in PDCCH/EPDCCH include a 2-bit downlink allocation index (DL DAI) field. DL DAI is a counter transmitted from the base station (eNB) to the user terminal (UE), and is used to indicate the total number of PDCCHs/EPDCCHs and DL SPS released PDCCHs/EPDCCHs of the eNB that scheduled the PDSCH in the bundling window. The DAI value in the first DL DCI transmitted by the eNB in the bundling window is 1, the DAI value in the second DL DCI transmitted by the eNB in the bundling window is 2, and the like. Based on the value of the DL DCI field, the UE can determine whether it has missed previous DL DCI(s) in the same bundling window, and depending on whether it has missed the DL DCI, HARQ-ACK feedback information in the same bundling window. You can determine the access method for transmitting. Additionally, for TDD UL/DL settings 1, 2, 3, 4, 5, or 6, UL DCI format 0/4 for physical uplink shared channel (PUSCH) scheduling transmits PDSCHs. Contains a 2-bit UL DAI field indicating the number of subframes used and the sum of the number of subframes used to transmit DL SPS release PDCCHs/EPDCCHs in the current bundling window, and also HARQ-ACK feedback information If is transmitted on PUSCH, it is used to determine the number of HARQ-ACK bits. For TDD UL/DL setting 0, Uplink Downlink Control Information (UL DCI) format 0/4 for PUSH scheduling is a downlink subframe scheduling PUSCHs of two uplink subframes. In this case, it indicates whether the PUSCH of one uplink subframe or the PUSCH of two uplink subframes is scheduled, and if the downlink subframe schedules the PUSCH of one uplink subframe, which uplink subframe is scheduled? It includes a 2-bit uplink index (UL index) field indicating whether the PUSCH of the link subframe is scheduled.

For FDD system, since the number of downlink subframes in which its HARQ-ACK is transmitted in an uplink subframe is 1, therefore, DL SPS release for PDSCH scheduling PDCCH/EPDCCH or DL DCI included in PDCCH/EPDCCH It does not include a 2-bit DL DAI field, and UL DCI format 0/4 for PUSCH scheduling does not include a 2-bit UL DAI field.

To improve transmission speeds for users, an LTE-A (LTE advanced) system has been proposed. In an LTE-A system, carrier aggregation (CA) is achieved by aggregating multiple component carriers (CCs) that make up the uplinks and downlinks in the communication system to support higher transmission rates. By this, a relatively large operating bandwidth is obtained. For example, 100MHz bandwidth can be supported by integrating five 20MHz CCs. Here, each CC is referred to as a cell. In the case of the UE, the base station can configure the UE to operate on multiple CCs, where one CC is the primary CC (PCC or Pcell) and the other CCs are referred to as secondary CCs (SCCs or Scells).

To more fully utilize certain resources, including unlicensed spectrum resources, the UE may use a CA system that aggregates more than 5 CCs, for example, a CA system that aggregates up to 32 cells. And, accordingly, a larger operating bandwidth can be obtained.

In a TDD system, if data in multiple downlink subframes is scheduled to transmit HARQ-ACK feedback information corresponding to data in multiple downlink subframes of the same cell in uplink subframe n, DL DAI information must be indicated, and as shown in Figure 3, DL DAI information of different cells is indicated individually.

An approach to feedback HARQ-ACK feedback information by the UE is physical uplink control channel (PUCCH) format 3, which can support up to 5 cells. The base station can schedule PUSCH resources for the UE by transmitting an uplink grant (UL grant) in the PDCCH. The value of UL DAI in the UL grant is used to determine the number of bits of HARQ-ACK feedback information transmitted using the PUCCH format 3 access method.

This is a case where the UE is set to PUCCH format 3 and transmits HARQ-ACK for HARQ-ACK transmission on PUCCH or PUSCH, where HARQ-ACK transmission on PUSCH is PDCCH/EPDCCH in which the UL DAI field does not exist. is scheduled by, or if HARQ-ACK transmission on the PUSCH is not scheduled by the detected PDCCH/EPDCCH, the UE is configured by two cells, and the size of the bundling window of the two cells is M. It is assumed that In this case, for cells with single input and multiple output (SIMO) transmission mode, the number of bits needed to transmit their HARQ-ACK feedback information is M; For cells with multiple input and multiple output (MIMO) transmission mode, the number of bits for HARQ-ACK feedback information to be transmitted for all of the UE's cells calculated according to the size of the bundling window of the cells. , if N (e.g., 20) or less, the number of bits required to transmit the HARQ-ACK feedback information of that cell is M*2: or, for cells with MIMO transmission mode, the size of the bundling window of those cells. If the number of bits for HARQ-ACK feedback information to be transmitted in all of the UE's cells calculated according to is greater than N (e.g., 20), the number of bits required to transmit the HARQ-ACK feedback information of that cell is M am.

If the UE is configured with PUCCH format 3 and transmits HARQ-ACK to transmit HARQ-ACK on the PUSCH scheduled by PDCCH/EPDCCH in which the UL DAI field is present, the UE is configured by two cells, The value of UL DAI is assumed to be M. In this case, for cells with SIMO transmission mode, the number of bits needed to transmit their HARQ-ACK feedback information is M; In a cell with MIMO transmission mode, if the number of bits of HARQ-ACK feedback information to be transmitted in all of the UE's cells calculated according to the value of UL DAI is N (e.g., 20) or less, the HARQ-ACK of that cell The number of bits needed to transmit feedback information is M*2; Or, in a cell with a MIMO transmission mode, if the number of bits of HARQ-ACK feedback information to be transmitted in all of the UE's cells calculated according to the value of UL DAI is greater than N (e.g., 20), the HARQ of that cell The number of bits required to transmit -ACK feedback information is M.

If the UE is configured with too many cells, for example up to 32 cells, cell-specific DL DAI may be introduced to direct scheduling of data of multiple cells within the same subframe. As shown in FIG. 4, this cell-specific DL DAI is not intended to indicate data transmission of multiple downlink subframes scheduled on the same cell, but rather indicates data transmission of multiple cells scheduled on one subframe. It is used to indicate. For example, for cells that need to feed back HARQ-ACK information in subframe n, the value of DL DAI is equal to the number of transmitted DL grants. The UL DCI for PUSCH scheduling includes a UL DAI field, and the value of UL DAI is equal to the total number of transmitted PDSCHs and DL SPS released PDCCHs/EPDCCHs. For the FDD system, the number of HARQ-ACK bits of all cells that need to feed back HARQ-ACK information in subframe n is referred to as the total number of HARQ-ACK bits. Because they exist in the same subframe, if the transmission modes of different cells are different, the number of HARQ-ACK bits of these different cells will also vary, and if the transmission modes of different cells are the same, the number of HARQ-ACK bits of these different cells will be different. The number of ACK bits is also the same. Additionally, if the HARQ-ACK of all different cells are spatially bundled, the number of HARQ-ACK bits of these different cells are the same, regardless of whether the transmission modes of these different cells are the same.

The present invention provides a method and device for transmitting and receiving HARQ acknowledgment response information in a wireless communication system supporting carrier aggregation.

According to an embodiment of the present invention, a method for a terminal to transmit HARQ acknowledgment information in a wireless communication system supporting carrier aggregation (CA) includes the process of receiving a downlink signal from a base station, and receiving the downlink signal from the downlink signal. Based on at least one of the obtained UL DAI, the number of downlink subframes, the number of cells configured for the terminal, and the transmission mode, the number of bits of HARQ acknowledgment information for the cells configured for the terminal It includes a process of determining and transmitting an uplink subframe containing the HARQ acknowledgment information for the cells.

In addition, according to an embodiment of the present invention, a terminal that transmits HARQ acknowledgment information in a wireless communication system supporting carrier aggregation (CA) includes a transceiver for transmitting and receiving signals, and a downlink signal from a base station, to the cells configured for the terminal, based on at least one of the Uplink Downlink Allocation Index (UL DAI), the number of downlink subframes, the number of cells configured for the terminal, and the transmission mode, obtained from the downlink signal. and a controller that determines the number of bits of HARQ acknowledgment information for the cells and controls transmission of an uplink subframe containing the HARQ acknowledgment information for the cells.

In addition, a method for transmitting HARQ-ACK (hybrid automatic repeat request acknowledgment) in an improved carrier aggregation system according to an embodiment of the present invention includes:

A user equipment (UE) receiving a physical downlink control channel (PDCCH)/enhanced physical downlink control channel (EPDCCH) and a physical downlink shared channel (PDSCH) transmitted from a base station;

The UE releases the uplink downlink allocation index (UL DAI) obtained from the uplink grant (UL grant) and the downlink semi-persistent scheduling received in the HARQ-ACK bundling window. Physical uplink shared channel (PUSCH) of the current uplink subframe, based on the number of PDCCH/EPDCCH subframes and PDSCH subframes indicating, or based on the number of cells or transmission modes configured for the UE or determining the number of bits of HARQ-ACK feedback information of cells configured for the UE to be transmitted on a physical uplink control channel (PUCCH); and

and the UE transmitting HARQ-ACK feedback information of all of the cells on PUSCH or PUCCH of the current uplink subframe.

When the current uplink subframe is in a secondary cell (Scell), determining the number of bits of the HARQ-ACK feedback information includes:

Including determining the number of HARQ-ACK bits to be fed back according to the number of PDCCH/EPDCCH subframes and PDSCH subframes indicating downlink SPS release received in the UL DAI and the HARQ-ACK bundling window, The UL/DL downlink control information (DCI) format scrambled by the cell radio network temporary identifier (C-RNTI) of the UE in the specific PDCCH/EPDCCH search space of the Scell of the UE includes UL DAI and DL DAI; or

When the current uplink subframe is in a primary cell (Pcell), determining the number of bits of the HARQ-ACK feedback information is,

Depending on the number of cells of the UE, determining the number of HARQ-ACK bits to be fed back, wherein the UL scrambled by the C-RNTI of the UE in the common and specific PDCCH/EPDCCH search spaces of the Pcell of the UE /DL DCI formats include UL DAI and DL DAI.

If the current uplink subframe is in a Scell, or the current uplink subframe is in a Pcell, and the current uplink subframe is scheduled by UL DCI in a UE-specific PDCCH/EPDCCH, the HARQ -Determining the number of bits of ACK feedback information determines the number of HARQ-ACK bits to be fed back according to the UL DAI, the PDCCH/EPDCCH subframes indicating the downlink SPS release, and the PDSCH subframes. Including determining, wherein the UL/DL DCI format scrambled by the C-RNTI of the UE in a specific PDCCH/EPDCCH search space of the Scell or Pcell of the UE includes UL DAI and DL DAI; also

If the current uplink subframe is in a Pcell and the current uplink subframe is scheduled by UL DCI in the common PDCCH, determining the number of bits of the HARQ-ACK feedback information is determined by the cell of the UE. Determining the number of HARQ-ACK bits to be fed back, according to the number of bits; Here, the UL/DL DCI format scrambled by the C-RNTI of the UE in the common PDCCH search space of the UE's Pcell includes UL DAI and DL DAI.

The UE transmits HARQ-ACK feedback information of all cells on the PUSCH of the current uplink subframe,

When counting that the DL DAI starts from the Scell, placing the HARQ-ACK bit of the Pcell first, and then placing the HARQ-ACK bits of all Scells in ascending order of the values of the DL DAI; and

Including when counting that the DL DAI starts from the Scell,

The UE detects a PDCCH for PDSCH scheduling and a PDCCH indicating DL SPS release in the common search space of the Pcell or a UE-specific search space, and detects a PDCCH for PDSCH scheduling and a PDCCH indicating DL SPS release. The PDCCH for PDSCH scheduling in the UE-specific search space and the PDCCH indicating DL SPS release do not include a DL DAI field, and the transmission mode of the Pcell is a single input and multiple output (SIMO) transmission mode. , If the transmission mode of the Pcell is a multiple input and multiple output (MIMO) transmission mode, but the HARQ-ACK of the Pcell is spatially bundled, the HARQ-ACK bit of the Pcell is placed at the very front, and then the DL DAI Arrange the HARQ-ACK bits of all Scells in ascending order of values; also

The UE detects a PDCCH for PDSCH scheduling and a PDCCH indicating DL SPS release in the UE-specific search space of the Pcell, and the UE-specific search in which the PDCCH for PDSCH scheduling and a PDCCH indicating DL SPS release are detected If the PDCCH for scheduling the PDSCH in space and the PDCCH indicating release of the DL SPS include a DL DAI field, arrange the HARQ-ACK bits of all Pcells and Scells in ascending order of the values of the DL DAI;

If the UE fails to detect the PDCCH/EPDCCH for PDSCH scheduling and the PDCCH/EPDCCH indicating DL SPS release in the common search space of the Pcell and the UE-specific search space, the Pcells in ascending order of the values of the DL DAI and HARQ-ACK bits of Scells; also

If the UE has downlink SPS transmission in a Pcell, and the transmission mode of the Pcell is MIMO transmission mode and is not spatially bundled, the HARQ-ACK bits of the UE are: {HARQ-ACK bit of the SPS PDSCH of the Pcell , NACK, HARQ-ACK bits of the Scells arranged in ascending order of the values of the DL DAI}, or {HARQ-ACK bits of the Scells arranged in ascending order of the values of the DL DAI, NACK, of the Pcell arranged as the HARQ-ACK bits of the SPS PDSCH,

Here, for an undetected PDSCH or a PDCCH/EPDCCH indicating undetected DL SPS release, the corresponding HARQ-ACK bit is set to NACK.

If the UE is set to PUCCH format 3 or format X and transmits HARQ-ACK, and the HARQ-ACK is transmitted on the PUCCH, or the UE transmits the HARQ-ACK on the PUSCH and If the HARQ-ACK transmission in the PUSCH is scheduled by a PDCCH/EPDCCH for which the UL DAI field is not present, or if the HARQ-ACK transmission in the PUSCH is not scheduled by a detected PDCCH/EPDCCH, the HARQ-ACK Determining the number of bits of feedback information determines the total number of bits of HARQ-ACK feedback information of all of the cells to be transmitted by the UE in the current uplink subframe according to the configured transmission modes of all of the cells. It includes doing.

The UE is set to PUCCH format 3 or format In the case of scheduling, determining the number of bits of the HARQ-ACK feedback information is determined according to the value of the UL DAI field carried in the PDCCH/EPDCCH on which the UE schedules the current uplink subframe. It includes determining the number of bits of HARQ-ACK feedback information, and also determining the number of the PDCCH/EPDCCH subframes and the PDSCH subframes indicating DL SPS release received in the HARQ-ACK bundling window.

The method further includes determining the number M of bits required to transmit HARQ-ACK feedback information of all of the cells according to the transmission modes of all of the cells configured for the UE, wherein the SIMO transmission mode is The number of bits required to transmit HARQ-ACK feedback information of a cell with the MIMO transmission mode is 1, and the number of bits necessary to transmit HARQ-ACK feedback information of a cell with the MIMO transmission mode is 2;

When M is less than or equal to a preset positive integer N, when the HARQ-ACK feedback information of all the cells is transmitted, the HARQ-ACK information of all the cells is not spatially bundled; Additionally, the value of the UL DAI field carried in the PDCCH/EPDCCH scheduling the current UL subframe is counted according to transmission blocks; also

If M is greater than a preset positive integer N, when the HARQ-ACK feedback information of all the cells is transmitted, the HARQ-ACK information of the cell whose transmission mode is MIMO transmission mode is spatially bundled; Additionally, the value of the UL DAI field carried in the PDCCH/EPDCCH scheduling the current uplink subframe is counted according to the number of cells.

The method further includes determining, based on higher layer signaling or physical layer signaling, whether the HARQ-ACK transmission of a serving cell whose transmission mode is MIMO transmission mode should be spatially bundled;

If according to the higher layer signaling or the physical layer signaling, it is determined that the HARQ-ACK transmission of a serving cell whose transmission mode is MIMO transmission mode is not spatially bundled, scheduling the current uplink subframe The value of the UL DAI field carried in the PDCCH/EPDCCH is counted according to transmission blocks; also

If according to the higher layer signaling or the physical layer signaling, it is determined that the HARQ-ACK transmission of the serving cell whose transmission mode is MIMO transmission mode is spatially bundled, scheduling the current uplink subframe The value of the UL DAI field carried in the PDCCH/EPDCCH is counted according to the transmission blocks according to the number of cells.

The physical layer signaling is one bit added to the DL DCI used by the PDCCH/EPDCCH for scheduling the PDSCH, or an existing bit in the DL DCI, and the HARQ-ACK of the UE is spatially bundled is configured to indicate whether or not it should be done; or

The physical layer signaling is one bit added to the UL DCI used by the PDCCH/EPDCCH scheduling the PUSCH, or an existing bit in the UL DCI, and the UE's HARQ-ACK is spatially bundled It is configured to indicate whether it should be done or not.

The UE determines the number B ^DL of bits of the HARQ-ACK feedback information according to the value of the UL DAI field and the number of PDSCH subframes and PDCCH/EPDCCH subframes,

If the HARQ-ACK is not spatially bundled, B ^DL =W _DAI U ^L + (2 ^L ) *ceiling((2a+bW _DAI ^{U L} )/ (2 ^L )); Also,

When the HARQ-ACK is spatially bundled, B ^DL =W _DAI ^UL + (2 ^L ) *ceiling((a+bW _DAI ^UL )/(2 ^L ));

Here, W _DAI ^UL is the value of the UL DAI field obtained from the UL grant in the PDCCH/EPDCCH, ceiling() is a rounded up function, and ""A is the value of serving cells with MIMO transmission mode. Indicates the total number of PDSCHs and PDCCHs/EPDCCHs indicating DL SPS release, and "L" is the number of bits of UL DAI in the UL grant, or the total number of bits of DAI/reference DAI obtained from DL DCI. It is a number, and “/” represents “or”.

The method further includes carrying DL DAIs in PDCCHs/EPDCCHs for PDSCH scheduling of all or some of the cells of the UE or in PDCCHs/EPDCCHs indicating DL SPS release;

The value of DL DAI indicates the number of PDCCHs/EPDCCHs transmitted to the current cell within the bundling window or the number of transmission blocks scheduled by PDCCHs/EPDCCHs transmitted to the current cell within the bundling window. for indicating numbers; Or, for serving cells with MIMO transmission mode, the value of the DL DAI represents the number of PDCCHs/EPDCCHs transmitted up to the current cell within the bundling window, or for serving cells with SIMO transmission mode, the The value of DL DAI represents the number of transmission blocks scheduled up to the current cell within the bundling window, where within the bundling window, serving cells with the MIMO transmission mode are transmitted before serving cells with the SIMO transmission mode. The DL DCI in the PDCCH/EPDCCH of the serving cell with the MIMO transmission mode carries an indicator indicating whether the HARQ-ACK of the serving cell with the MIMO transmission mode is spatially bundled.

If the UE is configured to PUCCH format 3 or format determine the number of bits of the HARQ-ACK feedback information of all of the cells to be transmitted in a link subframe; also

The method further includes determining a time and frequency resource weighting factor to transmit the HARQ-ACK according to the UL DAI included in the PDCCH/EPDCCH scheduling the current uplink subframe; also

When the HARQ-ACK feedback information of all of the cells is transmitted, the number of time and frequency resources occupied to feed back the HARQ-ACK feedback information is determined according to the time and frequency resource weighting coefficient.

Determining the number of bits of the HARQ-ACK feedback information of all of the cells to be transmitted in the current uplink subframe includes:

calculating the number M of bits required for the UE to transmit the HARQ-ACK feedback information of all of the cells according to the transmission modes of all of the cells; Here, for a cell with a SIMO transmission mode, the number of bits of the HARQ-ACK feedback information of the cell with the SIMO transmission mode is 1, and for a cell with a MIMO transmission mode, the HARQ of the cell with the MIMO transmission mode is 1. -The number of bits of ACK feedback information is 2;

If M is less than or equal to a preset positive integer N, determine that the number of bits required to transmit the HARQ-ACK feedback information of all of the cells in the current uplink subframe is M; Also, when the HARQ-ACK feedback information of all of the cells is transmitted, the HARQ-ACK feedback information of all of the cells is not spatially bundled; also

If M is greater than a preset positive integer N, determine that the number of bits required to transmit the HARQ-ACK feedback information of all of the cells in the current UL subframe is M'; Also, when the HARQ-ACK feedback information is transmitted, spatially bundling the HARQ-ACK information of the cell with the MIMO transmission mode; Here, M' is a calculated value, and the numbers of bits of HARQ-ACK feedback information of the cell with the SIMO transmission mode and the cell with the MIMO transmission mode are all 1.

Determining the number of bits of the HARQ-ACK feedback information of all of the cells to be transmitted in the current uplink subframe includes:

According to upper layer signaling or physical layer signaling, determine whether HARQ-ACK of a serving cell with MIMO transmission mode should be spatially bundled;

According to the set transmission mode of each cell, determine the number of bits of HARQ-ACK feedback information of each cell; In accordance with the determination that the HARQ-ACK of the serving cell with the MIMO transmission mode should be spatially bundled for transmission, the number of bits of the HARQ-ACK feedback information of the serving cell with the MIMO transmission mode and the SIMO The number of bits of the HARQ-ACK feedback information of the serving cell with the transmission mode is all 1; Also, if it is determined that the HARQ-ACK of the serving cell with the MIMO transmission mode should not be spatially bundled, the number of bits of the HARQ-ACK feedback information of the serving cell with the MIMO transmission mode is 2 and , the number of bits of the HARQ-ACK feedback information of the serving cell with the SIMO transmission mode is 1; also

Summing the number of bits of HARQ-ACK feedback information of all serving cells, and having the sum result as the total number of bits of HARQ-ACK feedback information of all of the cells to be transmitted in the current uplink subframe. .

An apparatus for transmitting HARQ-ACK in an improved carrier aggregation system, comprising a receiving unit, a bit number determination unit, and a transmitting unit,

The receiving unit receives a Physical Downlink Control Channel (PDCCH)/Enhanced Physical Downlink Control Channel (EPDCCH) and a Physical Downlink Shared Channel (PDSCH) transmitted from the base station;

The bit number determination unit determines the physical uplink shared channel (PUSCH) or physical uplink control channel of the current uplink subframe according to the uplink downlink allocation index (UL DAI) obtained from the uplink grant (UL grant). Determine the number of bits of HARQ-ACK feedback information of cells configured for the UE to be transmitted on (PUCCH) and, depending on transmission modes or the number of cells configured for the UE, be received in the HARQ-ACK bundling window determine the number of PDCCH/EPDCCH subframes and PDSCH subframes indicating downlink quasi-fixed scheduling release; also

The transmitting unit transmits the HARQ-ACK feedback information of all of the cells on the PUSCH or the PUCCH of the current uplink subframe.

As can be seen from the above technical solutions, the present invention is such that a UE receives PDCCH/EPDCCH and PDSCH transmitted from a base station; The UE, PDCCH/EPDCCH subframes and PDSCH subframes indicating downlink semi-persistent scheduling release received in the UL DAI and HARQ-ACK bundling window obtained from the UL grant Bits of HARQ-ACK feedback information of cells configured for the UE to be transmitted on the PUSCH or PUCCH of the current uplink subframe, based on the number, or based on the number of cells or transmission modes configured for the UE determine the number; Additionally, the UE transmits HARQ-ACK feedback information of all the cells on PUSCH or PUCCH of the current uplink subframe. According to the above-described process, the number of bits of HARQ-ACK feedback information of all cells to be transmitted in the uplink subframe can be appropriately determined, and thus HARQ-ACK information can be appropriately fed back.

1 is a diagram showing the structure of an LTE FDD frame,
Figure 2 is a diagram showing the structure of an LTE TDD frame;
3 is a schematic diagram of DL DAI information in a TDD system;
4 is a schematic diagram of cell-specific DL DAI information;
Figure 5 is a diagram for explaining the HARQ-ACK method in a wireless communication system supporting carrier aggregation according to an embodiment of the present invention;
6 is a first schematic diagram of a bundling window in a TDD system according to an embodiment of the present invention;
7 is a second schematic diagram of a bundling window in a TDD system according to an embodiment of the present invention;
Figure 8 is a diagram for explaining a DL DAI counting method according to an embodiment of the present invention.

In order to further clarify the purpose, technical method, and advantages of the present invention, the present invention will be described in detail below with reference to the attached drawings and examples.

Figure 5 is a diagram for explaining the HARQ-ACK method in a wireless communication system supporting carrier aggregation according to an embodiment of the present invention.

Referring to FIG. 5, Step 501: The UE receives information about PDCCH/EPDCCH and PDSCH transmitted from the base station.

Step 502: Uplink downlink assignment index (UL DAI) obtained from the UL grant, and PDSCH subframes and PDCCH/EPDCCH subframes indicating downlink SPS release received in the HARQ-ACK bundling window Based on the number, or the number of all cells configured, or based on the transmission modes of the configured cells, the UE determines the HARQ-to be transmitted by each cell configured for the UE in the PUSCH or in the PUCCH of the current uplink subframe. Determines the number of bits of ACK feedback information.

Specifically, the UE can determine the number of bits of HARQ-ACK feedback information to be transmitted in the PUSCH based on the UL DAI and also PDSCH subframes and PDCCH indicating downlink SPS release received in the HARQ-ACK bundling window. /EPDCCH The number of subframes can be determined. Additionally, the UE may determine the number of HARQ-ACK feedback information to be transmitted on PUCCH based on the number of all configured cells, or may determine transmission modes of all configured cells.

Step 503: The UE transmits HARQ-ACK feedback information of each cell on PUSCH or PUCCH of the current uplink subframe.

Hereinafter, the technical solution of the present invention will be described in more detail through several embodiments.

Example 1

The UE is configured by a plurality of FDD cells. Let us first explain the designs of DL DAI and UL DAI. In this specification, when PUCCH is scheduled, UL DAI does not exist, and when PUSCH is scheduled, UL DAI may or may not exist.

To indicate scheduling of data of multiple cells in the same downlink subframe, PDCCHs/EPDCCHs for PDSCH scheduling of some or all of the cells and DL DCIs of PDCCHs/EPDCCHs indicating downlink SPS release By introducing cell-specific DL DAI, it indicates the number of transmitted PDCCHs/EPDCCHs or the number of transmission blocks (TB) scheduled up to the current cell. By introducing UL DAI in the UL DCIs for PUSCH scheduling for some or all of the cells, or based on the UE's current number of cells, the number of HARQ-ACK bits to be transmitted on the PUSCH can be calculated.

In the conventional FDD system (3GPP Rel12), all downlink DCI formats do not contain the DL DAI bit field, and also all uplink DCI formats do not contain the UL DAI bit field, therefore, in the conventional FDD system Uplink and downlink DCI formats need to be optimized.

According to one implementation of the present invention, uplink and downlink DCI formats in a conventional FDD system can be optimized in the following manner. In the Pcell configured for the UE, the uplink and downlink DCI formats scrambled by the UE's cell radio network temporary identity (C-RNTI) are unaltered in common and specific PDCCH/EPDCCH search spaces. remains in state, and in the Scell configured for the UE, the UL DAI field and the DL DAI field are introduced in the uplink and downlink DCI formats, respectively, scrambled by the UE's C-RNTI in the UE-specific PDCCH/EPDCCH search space; , where the UL/DL DAI field includes N bits (eg, N=2 or 3). In this case, when the uplink subframe that feeds back HARQ-ACK is in the PCell, the number of HARQ-ACK bits to be fed back is determined based on the number of cells of the UE, and the uplink subframe that feeds back HARQ-ACK is determined based on the number of cells of the UE. If the frame is located in a Scell, the number of HARQ-ACK bits to be fed back is determined based on the UL DAI. If the number of HARQ-ACKs to be fed back is determined based on UL DAI, the number of PDSCH subframes and PDCCH/EPDCCH subframes indicating downlink SPS release received in the HARQ-ACK bundling window must also be considered. The same applies to the following, which will not be explained in detail.

According to another implementation of the invention, in a Pcell configured for a UE, the uplink and downlink DCI formats scrambled by the UE's C-RNTI in the common PDCCH search space remain unchanged; Additionally, the UL DAI field and DL DAI field are introduced in the uplink and downlink DCI formats scrambled by the UE's C-RNTI in the UE-specific PDCCH/EPDCCH search space in the Pcell configured for the UE, and the Scell configured for the UE In the UE-specific PDCCH/EPDCCH search space, uplink and downlink DCI formats are respectively scrambled by the UE's C-RNTI, where the UL/DL DAI field is introduced with N bits (e.g., N=2 or 3). In this case, if the uplink subframe feeding back HARQ-ACK is in a Pcell and the uplink subframe is scheduled by UL DCI in a UE-specific PDCCH/EPDCCH, or if the uplink subframe feeding back HARQ-ACK is In the case of Scell, the number of HARQ-ACK bits to be fed back is determined according to the UL DAI, otherwise, the number of HARQ-ACK bits to be fed back is determined according to the number of cells of the UE.

Let us explain the following several HARQ-ACK transmission methods for Pcell and Scell.

Method 1:

The method for arranging HARQ-ACK bits is as follows. DL DAIs are counted from the Scell configured for the UE, and if the transmission mode of the Pcell is SIMO transmission mode, or if the transmission mode of the Pcell is MIMO transmission mode but the HARQ-ACK of the Pcell is spatially bundled, The HARQ-ACK bit of the Pcell is placed in the first place, and the transmission mode of the Pcell is MIMO transmission mode, but when the HARQ-ACK of the Pcell is spatially bundled, the HARQ-ACK bits of the Pcell are placed in the first and second places. , and the HARQ-ACK bits of Scells are arranged in ascending order of DL DAIs. HARQ-ACK information of PDCCH/EPDCCH indicating release of undetected PDSCH and undetected downlink SPS is set to NACK.

For example, if the UE does not detect a PDCCH/EPDCCH for PDSCH scheduling in a Pcell and also fails to detect a PDCCH/EPDCCH indicating downlink SPS release, and there is no DL SPS transmission from any Pcell in that subframe, And if the transmission mode of the Pcell is a SIMO transmission mode, or the transmission mode of the Pcell is a MIMO transmission mode and thus spatially bundled, the UE's HARQ-ACK may be arranged as follows: {NACK, based on DL DAIs HARQ-ACK bits of sorted Scells}. If the UE fails to detect the PDCCH/EPDCCH for PDSCH scheduling in the Pcell and also fails to detect the PDCCH/EPDCCH indicating downlink SPS release, if there is no downlink SPS transmission of any Pcell in that subframe, and the Pcell's If the transmission mode is a MIMO transmission mode and thus spatially bundled, the UE's HARQ-ACK may be arranged as follows: {NACK, NACK, HARQ-ACK bits of Scells sorted based on DL DAIs}. When the UE detects the PDCCH/EPDCCH for PDSCH scheduling in the Pcell, and the transmission mode of the Pcell is MIMO transmission mode and is not spatially bundled, the UE's HARQ-ACK may be arranged as follows: {Pcell's HARQ-ACK bit of PDSCH codeword 0, HARQ-ACK bit of PDSCH codeword 1 of Pcell, HARQ-ACK bits of Scell sorted based on DL DAIs}. If the UE has a downlink SPS PDSCH transmission in the Pcell, and if the transmission mode of the Pcell is transmission mode and thus not spatially bundled, the UE's HARQ-ACK may be arranged as follows: {of the SPS PDSCH of the Pcell HARQ-ACK bits, NACK, HARQ-ACK bits of Scells sorted based on DL DAIs}, or {HARQ-ACK bits of Scells sorted based on DL DAIs, NACK, of SPS PDSCH of Pcell HARQ-ACK bits}

Method 2：

The method for arranging HARQ-ACK bits is as follows.

Assuming that DL DAIs are counted from the Pcell configured for the UE, when the UE detects a PDCCH for PDSCH scheduling and a PDCCH indicating downlink SPS release in the common search space of the Pcell or in the specific search space of the Pcell ( In the UE-specific search space of the Pcell, the PDCCH/EPDCCH for PDSCH scheduling and the PDCCH/EPDCCH indicating DL SPS release do not include the DL DAI field), and the transmission mode of the Pcell is SIMO transmission mode, or the transmission mode of the Pcell If the mode is MIMO transmission mode but HARQ-ACK is spatially bundled, the HARQ-ACK bit of the Pcell is placed in the first place, and the HARQ-ACK bits of the Scells are placed in ascending order of DL DAIs. And when the UE detects a PDCCH/EPDCCH for PDSCH scheduling and a PDCCH/EPDCCH indicating downlink SPS release in the UE-specific search space of the Pcell (in the UE-specific search space of the Pcell, PDCCH/EPDCCH for PDSCH scheduling and (PDCCH/EPDCCH indicating DL SPS release includes a DL DAI field), HARQ-ACK bits of Pcell and Scell are arranged in ascending order of DL DAI.

If it is assumed that the UE does not detect the PDCCH/EPDCCH for PDSCH scheduling and the PDCCH/EPDCCH indicating downlink SRS release in the common search space of the Pcell and the UE-specific search space, the HARQ-ACK bits of the Pcell and Scell DL DAIs are arranged in ascending order; Additionally, the HARQ-ACK information of the undetected PDSCH and undetected PDCCH/EPDCCH indicating downlink SPS release is set to NACK.

If the UE has downlink SPS transmission in the Pcell, and if the transmission mode of the Pcell is a MIMO transmission mode and thus is not spatially bundled, the UE's HARQ-ACK may be arranged as follows: {of the SPS PDSCH of the Pcell HARQ-ACK bits, NACK, HARQ-ACK bits of Scells deployed based on DL DAIs}, or {HARQ-ACK bits of Scells deployed based on DL DAIs, NACK, of SPS PDSCH of Pcell HARQ-ACK bits}.

Example 2

The processing mode of this embodiment relates to situations where HARQ-ACK is transmitted on PUCCH or on PUSCH. For situations where HARQ-ACK is transmitted on PUCCH, UL DAI is not included; And in the case of a situation where HARQ-ACK is transmitted on PUSCH, UL DAI may or may not be included.

Assuming that the UE is configured by multiple FDD cells, if the transmission mode configured by the UE for the cell is SIMO transmission mode, a downlink subframe corresponds to one transmission block and its transmitted HARQ-ACK becomes 1 bit; Additionally, when the transmission mode set for the cell by the UE is the MIMO transmission mode, the downlink subframe corresponds to two transmission blocks, and its transmitted HARQ-ACK becomes 2 bits. Here, the bundling window is counted in a specific cell, and the size of the bundling window indicates the number of downlink subframes of all cells in which HARQ-ACK feedback information is transmitted on the same PUCCH. That is, as shown in FIG. 6, when the number of downlink subframes in which the HARQ-ACK is transmitted in an uplink subframe is 4, the size of the bundling window is 4. Alternatively, the size of the bundling window indicates the number of transmission blocks in downlink subframes of all cells in which HARQ-ACK feedback information is transmitted on the same PUCCH. That is, as shown in FIG. 7, the number of downlink subframes in which the HARQ-ACK is transmitted in an uplink subframe is four, where two cells are in SIMO transmission mode and two cells are in MIMO transmission mode. In this case, the number of HARQ-ACK bits to be transmitted in the uplink subframe is 1+1+2+2=6, and the size of the bundling window is 6.

The transmission modes set for different cells, in which HARQ-ACK feedback information is transmitted in the same uplink subframe, may be different. Therefore, some cells may be set to SIMO transmission mode, a situation where the HARQ-ACK feedback information of the downlink subframe of each cell is 1 bit, and some cells may be set to MIMO transmission mode, and each cell In a situation where the HARQ-ACK feedback information of the downlink subframe is 2 bits, how are DL DAIs counted in PDCCHs/EPDCCHs for PDSCH scheduling within the bundling window and PDCCHs/EPDCCHs indicating SPS release? must be taken into consideration.

One method for DL DAI counting is to indicate the number of PDCCHs/EPDCCHs transmitted up to the current cell within the bundling window, where each PDCCH/EPDCCH schedules a PDSCH or indicates downlink SPS release, and also, UL DAI indicates the number of PDSCHs and PDCCHs/EPDCCHs that indicate downlink SPS release scheduled by the eNB in the current subframe. This method for DL DAI counting can be applied to a situation where all cells are set to SIMO transmission mode or are set to MIMO transmission mode and HARQ-ACK is spatially bundled. The DAI value in the first DL DCI transmitted by the eNB in the bundling window is 1, the DAI value in the second DL DCI transmitted by the eNB in the bundling window is 2, and the like. According to the value of the DL DAI field, the UE can determine whether previous DL DCI(s) were missed in the same bundling window, and also HARQ-ACK feedback information in the same bundling window depending on whether the DL DCI was missed. You can decide how to transmit.

Another method for DL DAI counting is to indicate the number of transmission blocks scheduled by PDCCHs/EPDCCHs transmitted up to the current cell within the bundling window, where each PDCCH/EPDCCH of a cell with SIMO transmission mode is One transmission block is scheduled, and each PDCCH/EPDCCH of a cell with MIMO transmission mode schedules two transmission blocks. This method for DL DAI counting is in a situation where the UE is set by both cells with SIMO transmission mode and cells with MIMO transmission mode, and the HARQ-ACK of cells with MIMO transmission mode is not spatially bundled. It can be applied. Additionally, UL DAI indicates the number of transmission blocks scheduled by the eNB in the current subframe. When the cell of the 1st DL DCI is set to SIMO transmission mode, the value of DAI in the 1st DL DCI transmitted by the eNB in the bundling window is 1, and the cell of the 1st DL DCI is set to MIMO transmission mode. When set, the value of DAI in the first DL DCI transmitted by the eNB in the bundling window is 2. When the cell of the first DL DCI is set to SIMO transmission mode, and when the cell of the second DL DCI is set to SIMO transmission mode, the value of DAI in the second DL DCI transmitted by the eNB in the bundling window becomes 2; When the cell of the first DL DCI is set to SIMO transmission mode, and when the cell of the second DL DCI is set to MIMO transmission mode, the value of DAI in the second DL DCI transmitted by the eNB in the bundling window becomes 3; Additionally, when the cell of the first DL DCI is set to MIMO transmission mode, and when the cell of the second DL DCI is set to SIMO transmission mode, the DAI in the second DL DCI transmitted by the eNB in the bundling window The value becomes 3; When the cell of the first DL DCI is set to MIMO transmission mode, and when the cell of the second DL DCI is set to MIMO transmission mode, the value of DAI in the second DL DCI transmitted by the eNB in the bundling window This becomes 4, and others are like this. Depending on the value of the DL DAI field, the UE can determine whether previous DL DCI(s) were missed in the same bundling window, and also HARQ-ACK feedback information in the same bundling window depending on whether the DL DCI was missed. You can decide how to transmit.

Another method for DL DAI counting is that, within the bundling window, first serving cells with MIMO transmission mode set by the UE are placed in front, then serving cells with SIMO transmission mode set by the UE are placed. This arrangement can be done when the base station configures the indices of the serving cells. That is, according to the ascending order of the indices of the serving cells, first serving cells with MIMO transmission mode are deployed, and then serving cells with SIMO transmission mode are deployed. In this case, the indices of serving cells are also referred to as DL DAI sort indices of serving cells. Or, the indices of serving cells are not placed in this order. In this case, if the base station determines the DL DAI when scheduling serving cells, it sorts the serving cells. That is, the base station deploys serving cells with MIMO transmission mode in the front, and then deploys serving cells with SIMO transmission mode, which are referred to as DL DAI alignment indices of the serving cells. DL DAI sort indices of serving cells do not include Pcell. For a serving cell with a MIMO transmission mode and a serving cell with a SIMO transmission mode, the meaning of the number of bits and the values of DL DAIs is different, and this will be described in detail below.

For DL DAI included in the DL DCI of PDSCH for scheduling a serving cell with MIMO transmission mode, the number of bits it occupies is P-1 (P is a positive integer, e.g. P=3), and DL The value of DAI is used to indicate how many PDCCHs/EPDCCHs have been transmitted to the current cell within the bundling window, and 1-bit physical layer signaling in DL DCI requires the UE's HARQ-ACK to be spatially bundled. It is used to indicate whether or not there is. A specific indication method using physical layer signaling may be, for example, an indication value of physical layer signaling of "0" to express that the UE's HARQ-ACK is not spatially bundled; The physical layer signaling indication value of "1" may indicate that the UE's HARQ-ACK is spatially bundled. The indication values of the physical layer signaling in the PDCCHs/EPDCCHs for scheduling the PDSCHs of all serving cells with the UE's MIMO transmission mode are the same.

In the case of DL DAI included in the DL DCI of PDSCH for scheduling a serving cell with SIMO transmission mode, the number of bits it occupies is P, and the value of DL DAI is how many transmission blocks are transmitted up to the current cell in the bundling window. Indicates whether scheduled PDCCHs/EPDCCHs are scheduled, where each PDCCH/EPDCCH in a cell with SIMO transmission mode schedules one transmission block, and each PDCCH/EPDCCH in a cell with MIMO transmission schedules two transmission blocks. Scheduling is considered. This method for DL DAI counting can be applied to situations where the UE is configured by both cells with SIMO transmission mode and cells with MIMO transmission mode, where the HARQ-ACK of the serving cell with MIMO transmission mode is spatially It may or may not be bundled. UL DAI indicates the total number of transmission blocks scheduled by the eNB in the current subframe.

Figure 8 is a diagram for explaining the DL DAI counting method according to an embodiment of the present invention.

Referring to Figure 8, for example, P=3, the UE schedules two serving cells with MIMO transmission mode, and then schedules three serving cells with SIMO transmission mode. The DL DAI in the DL DCI for scheduling the first serving cell with MIMO transmission mode is 2 bits, its value is 1, and the 1-bit physical layer signaling in the DL DCI is “0”, which is Indicates that the UE's HARQ-ACK is not spatially bundled; Also, the DL DAI in the DL DCI for scheduling the second serving cell with MIMO transmission mode is 2 bits, its value is 2, and the 1-bit physical layer signaling in the DL DCI is “0”, This indicates that the UE's HARQ-ACK is not spatially bundled; Then the DL DAI in the DL DCI for scheduling the first serving cell with SIMO transmission mode is 3 bits, its value is 5; DL DAI in DL DCI for scheduling the second serving cell with SIMO transmission mode is 3 bits, its value is 6; DL DAI in DL DCI for scheduling the third serving cell with SIMO transmission mode is 3 bits, and its value is 7.

In this way, by using the value of the DL DAI field, the UE can determine whether it has missed previous DL DCI(s) and send HARQ-ACK feedback information depending on whether there is a DL DCL loss in the same bundling window. You can also decide how to transmit.

The value of UL DAI in the UL grant is used to determine the number of bits to transmit HARQ-ACK feedback information on PUSCH using PUCCH format 3, or the value of UL DAI in the UL grant is used to determine the number of bits to transmit HARQ-ACK feedback information in PUSCH using PUCCH format It is used to determine the number of bits for transmitting HARQ-ACK feedback information on PUSCH.

When the UE is configured with PUCCH format 3 and transmits HARQ-ACK, or when the UE is configured with PUCCH format For cells with SIMO transmission mode, the HARQ-ACK transmission in the PUSCH is scheduled by a PDCCH/EPDCCH without a UL DAI field, or the HARQ-ACK transmission in the PUSCH is not scheduled by a detected PDCCH/EPDCCH, The number of bits needed to transmit its HARQ-ACK feedback information is 1; Also, for a cell with MIMO transmission mode, the number of bits needed to transmit its HARQ-ACK feedback information is 2. The number M of bits required to transmit HARQ-ACK feedback information in all cells configured for the UE in an uplink subframe can be calculated based on the transmission modes of all cells configured for the UE.

If the calculated number M of bits required to transmit HARQ-ACK feedback information of all of the UE's cells is less than or equal to N depending on the transmission modes of the configured cells (e.g., in the case of PUCCH format 3, N= 20), HARQ-ACK information of all cells does not need to be spatially bundled. Based on this, for a cell with SIMO transmission mode, when HARQ-ACK transmission is actually performed, the number of bits of its HARQ-ACK feedback information is 1; Also, in the case of a cell with MIMO transmission mode, when HARQ-ACK transmission is actually performed, the number of bits of its HARQ-ACK feedback information is 2. In this case, DL DAI in PDCCH/EPDCCH for PDSCH scheduling is counted according to transmission blocks. That is, the number of bits of HARQ-ACK feedback information of all cells finally determined to be transmitted on the PUSCH of the current uplink subframe is M.

If the calculated number M of bits required to transmit HARQ-ACK feedback information of all cells of the UE is greater than N according to the transmission modes of the configured cells (e.g., in the case of PUCCH format 3, N = 20) , HARQ-ACK information of a configured cell with MIMO transmission mode needs to be spatially bundled. Therefore, for a cell with SIMO transmission mode, when HARQ-ACK is actually performed, the number of bits of its HARQ-ACK feedback information is 1; Additionally, in the case of a cell with MIMO transmission mode, when HARQ-ACK is actually performed, the number of bits of its HARQ-ACK feedback information is 1. Also, in this case, DL DAI in PDCCH/EPDCCH for PDSCH scheduling is counted according to the number of these cells. That is, the finally determined number of bits of HARQ-ACK feedback information of all cells transmitted in the PUSCH of the current uplink subframe is M', that is, the total number of cells.

Assuming that the UE is configured with 6 cells, and all of these 6 cells are FDD cells with 2 cells configured to SIMO transmission mode and the other 4 cells configured to MIMO transmission mode, HARQ-ACK configured for the UE The transmission format is PUCCH format 3, and the number of bits of HARQ-ACK feedback information of 6 cells is 2+4*2=10<20, therefore, HARQ-ACK of cells set to MIMO transmission mode will be spatially bundled. There is no need, and the number of bits of HARQ-ACK feedback information of a cell set to SIMO transmission mode is 1, and the number of bits of HARQ-ACK feedback information of a cell set to MIMO transmission mode is 2. Below, assuming that the UE is configured with 16 cells, and all of these 16 cells are FDD cells, with 10 cells configured to SIMO transmission mode and the other 6 cells configured to MIMO transmission mode, the The HARQ-ACK transmission format is PUCCH format 3, and the number of bits of HARQ-ACK feedback information of 16 cells is 10+6*2=22>20. Therefore, HARQ-ACK of cells set to MIMO transmission mode is spatial It needs to be bundled, and the number of bits of HARQ-ACK feedback information of a cell set to SIMO transmission mode is 1, and the number of bits of HARQ-ACK feedback information of a cell set to MIMO transmission mode is 1.

When the UE is set to PUCCH format 3 and transmits HARQ-ACK, or when the UE is set to PUCCH format X and transmits HARQ-ACK, HARQ-ACK is transmitted on PUSCH, and HARQ-ACK transmission on PUSCH is It is scheduled by PDCCH/EPDCCH where the UL DAI field is present, and for a cell with SIMO transmission mode, the number of bits needed to transmit its HARQ-ACK feedback information is 1; For a cell with MIMO transmission mode, the number of bits transmitting its HARQ-ACK feedback information is 2. The number M of bits of HARQ-ACK feedback information of all cells configured for the UE to be transmitted in the uplink subframe is calculated based on the transmission modes of all of the cells configured for the UE. If the number M of bits of HARQ-ACK feedback information of all cells configured for the UE calculated according to the transmission modes of the cells is less than or equal to N (e.g., in the case of PUCCH format 3, N = 20), the cells All HARQ-ACK information does not need to be spatially bundled. Therefore, for a cell with SIMO transmission mode, when HARQ-ACK transmission is actually performed, the number of bits of its HARQ-ACK feedback information is 1; Also, for a cell with MIMO transmission mode, when HARQ-ACK transmission is actually performed, the number of bits of its HARQ-ACK feedback information is 2. In this case, UL DAI counts according to transmission blocks, and the number of bits of HARQ-ACK feedback information transmitted by the UE is the value of UL DAI.

Assuming that the UE is configured with 6 cells, and all of these 6 cells are FDD cells with 2 cells configured to SIMO transmission mode and the other 4 cells configured to MIMO transmission mode, HARQ-ACK configured for the UE The transmission format is PUCCH format 3, and the number of bits of HARQ-ACK information of 6 cells is 2+4*2=10<20, therefore, HARQ-ACK of cells set to MIMO transmission mode needs to be spatially bundled. There is no, the number of bits of HARQ-ACK feedback information of a cell with SIMO transmission mode is 1, and the number of bits of HARQ-ACK feedback information of a cell with MIMO transmission mode is 2. In this case, when the value of UL DAI is 6, the number of HARQ-ACK bits to be transmitted on PUSCH is 6.

The number M of bits for transmitting HARQ-ACK feedback information of all cells configured for the UE in the uplink subframe is calculated according to the transmission modes of all cells configured for the UE. If the number M of bits required to transmit HARQ-ACK feedback information of all cells configured for the UE according to the transmission mode information of all cells configured for the UE is greater than N (e.g., in the case of PUCCH format 3, N=20), HARQ-ACK information of cells set to MIMO transmission mode must be spatially bundled. Therefore, for a cell with SIMO transmission mode, when HARQ-ACK transmission is actually performed, the number of bits of its HARQ-ACK feedback information is 1, and for a cell with MIMO transmission mode, HARQ-ACK transmission is 1. When actually performed, the number of bits of its HARQ-ACK feedback information is 1. Below, a method for determining the number of bits of HARQ-ACK feedback information transmitted by the UE will be described. In this case, UL DAI counts based on the number of cells, and the number of bits of HARQ-ACK feedback information that needs to be transmitted by the UE is the value of UL DAI.

Assuming that the UE is configured with 16 cells, and all of these 16 cells are FDD cells with 10 cells configured to SIMO transmission mode and the other 6 cells configured to MIMO transmission mode, HARQ-ACK configured for the UE The transmission format is PUCCH format 3, and the number of bits of HARQ-ACK feedback information of 16 cells is 10+6*2=22>20. Therefore, HARQ-ACK of cells set to MIMO transmission mode will be spatially bundled. There is a need, and the number of bits of HARQ-ACK feedback information of a cell with SIMO transmission mode is 1, and the number of bits of HARQ-ACK feedback information of a cell with MIMO transmission mode is 2. In this case, when the value of UL DAI is 13, the number of HARQ-ACK bits to be transmitted on PUSCH is 13.

As described above, in the case of HARQ-ACK transmission on PUSCH, whether the UE's HARQ-ACK needs to be spatially bundled depends on the total number of HARQ-ACK bits calculated based on the cells configured for the UE and It depends on whether the transmission modes set for those cells are greater than N and is independent of the value of UL DAI. Meanwhile, in the case of HARQ-ACK transmission on PUCCH, whether the UE's HARQ-ACK needs to be spatially bundled is determined based on the HARQ-ACK bit calculated based on the cells configured for the UE and the transmission modes configured for the UE. It depends on whether the total number of is greater than N.

Another way to determine whether the UE's HARQ-ACK needs to be spatially bundled is to determine whether the higher layer signaling settings or the HARQ-ACK of the serving cell with MIMO transmission mode requires the physical layer signaling to be spatially bundled. This includes the UE's HARQ-ACK transmission on PUCCH and the UE's HARQ-ACK transmission on PUSCH. The indication by using physical layer signaling is to add 1 bit or re-interpret the bits of the conventional field in DL DCI used by PDCCH/EPDCCH for PDSCH scheduling so that the UE's HARQ-ACK is spatially bundled. can indicate whether it needs to be used, or by using physical layer signaling, to add 1 bit or re-bit the conventional field in the UL DCI used by PDCCH/EPDCCH for PUSCH scheduling. By interpretation, it may indicate whether the UE's HARQ-ACK needs to be spatially bundled. A specific indication method using physical layer signaling is that an indication value of physical layer signaling of "0" indicates that the UE's HARQ-ACK is not spatially bundled; Additionally, the physical layer signaling indication value of "1" may indicate that the UE's HARQ-ACK is spatially bundled. The indication values of physical layer signaling in PDCCHs/EPDCCHs for UE's PDSCH scheduling are the same. Below, this method will be described.

If higher layer signaling configures HARQ-ACK for serving cells with MIMO transmission mode that need to be spatially bundled, or for cells with SIMO transmission mode if physical layer signaling indicates this, HARQ-ACK transmission When this is performed, the number of bits of its HARQ-ACK feedback information is 1; Also, for a cell with MIMO transmission mode, when HARQ-ACK transmission is performed, the number of bits of its HARQ-ACK feedback information is 1. In this case, DL DAI in PDCCH/EPDCCH for PDSCH scheduling is counted according to the number of cells. In situations where UL DAI does not exist (i.e., the UE is set to PUCCH format 3 or format X and transmits HARQ-ACK, and this HARQ-ACK is transmitted on PUSCH, or the UE transmits HARQ-ACK on PUSCH) In this case, the HARQ-ACK transmission on the PUSCH is scheduled by the PDCCH/EPDCCH for which the UL DAI field is not present, or the HARQ-ACK transmission on the PUSCH is not scheduled by the detected PDCCH/EPDCCH), or the HARQ-ACK transmission to be transmitted The number of ACK bits is determined according to the transmission modes of each cell; Also, in a situation where UL DAL exists (i.e., the UE is set to PUCCH format 3 or format A method for determining the number of HARQ-ACK bits to be transmitted by the UE according to the value of UL DAI is where UL DAI counts according to the number of cells, and the number of HARQ-ACK bits to be transmitted by the UE is UL DAI, This is the same as the above-described method of determining the number of HARQ-ACK bits according to UL DAI.

Assuming that the UE is configured with 16 cells, and all of these 16 cells are FDD cells with 10 cells configured to SIMO transmission mode and the other 6 cells configured to MIMO transmission mode, HARQ-ACK configured for the UE The transmission format is PUCCH format 3, the number of bits of HARQ-ACK feedback information of a cell with SIMO transmission mode is 1, the HARQ-ACK of a cell set to MIMO transmission mode needs to be spatially bundled, and the MIMO transmission mode The number of bits of HARQ-ACK feedback information of a cell with is 1. In this case, when UL DAI is 13, the number of HARQ-ACK bits to be transmitted on PUSCH is 13.

It is assumed that higher layer signaling sets up HARQ-ACK of the serving cell with MIMO transmission mode that does not need to be spatially bundled, or that physical layer signaling indicates this. For a cell with SIMO transmission mode, when HARQ-ACK transmission is actually performed, the number of bits of its HARQ-ACK feedback information is 1; Also, in the case of a cell with MIMO transmission mode, when HARQ-ACK transmission is actually performed, the number of bits of its HARQ-ACK feedback information is 2. In this case, DL DAI in PDCCH/EPDCCH for PDSCH scheduling is counted according to transmission blocks. In situations where UL DAI does not exist (i.e., the UE is set to PUCCH format 3 or format X and transmits HARQ-ACK, HARQ-ACK transmission is performed on PUCCH, or the UE transmits HARQ-ACK on PUSCH In this case, the HARQ-ACK transmission on the PUSCH is scheduled by the PDCCH/EPDCCH for which the UL DAI field is not present, or the HARQ-ACK transmission on the PUSCH is not scheduled by the detected PDCCH/EPDCCH), the HARQ to be transmitted -The total number of ACK bits is determined according to the transmission modes of each cell; Also, in a situation where UL DAI exists (i.e., the UE is set to PUCCH format 3 or format X and transmits HARQ-ACK, and HARQ transmission on PUSCH is scheduled by PDCCH/EPDCCH where the UL DAI field is present) , UL DAI counts according to transmission blocks, and the number of bits of HARQ-ACK feedback information to be transmitted by the UE is UL DAI, which is the same as the above-described method of determining the number of HARQ-ACK bits according to UL DAI. do.

Assuming that the UE is configured with 6 cells, and all 6 cells are FDD cells, 2 cells are configured with SIMO transmission mode and the other 4 cells are configured with MIMO transmission mode, HARQ- The ACK transmission format is PUCCH format 3, the number of bits of HARQ-ACK feedback information of a cell with SIMO transmission mode is 1, and the HARQ-ACK of a cell set to MIMO transmission mode does not need to be spatially bundled, and MIMO transmission The number of bits of HARQ-ACK feedback information of a cell with the mode is 2. In this case, when the value of UL DAI is 6, the number of HARQ-ACK bits to be transmitted on PUSCH is 6.

Below, we will describe how the UE determines the number of HARQ-ACK bits, B ^DL , based on the detected PDCCH/EPDCCH, the number of PDSCHs, and the value of UL DAI. If HARQ-ACK is not spatially bundled, the following equation (1) becomes:

where W _DAI ^UL is the value of the UL DAI obtained by the UE from the UL grant of the PDCCH/EPDCCH, or the value of the sum DAI or reference DAI obtained by the UE from the PDCCH/EPDCCH, where the sum DAI value or the reference DAI The value is a reference value used to calculate the number of HARQ-ACK bits;

ceiling() is a rounded up function;

Here, “a” represents the total number of PDSCHs and PDCCHs/EPDCCHs indicating DL SPS release in serving cells with the MIMO transmission mode detected by the UE, and “b” represents the SIMO transmission mode detected by the UE. Indicates the total number of PDSCHs and PDCCHs/EPDCCHs indicating DL SPS release in serving cells. And when HARQ-ACK is spatially bundled, the following equation (2) is expressed.

where W _DAI ^UL is the value of the UL DAI obtained by the UE from the UL grant of the PDCCH/EPDCCH, or the value of the sum DAI or reference DAI obtained by the UE from the PDCCH/EPDCCH, where the value of the sum DAI or the reference DAI The value of is a reference value used to calculate the number of HARQ-ACK bits;

ceiling() is a roundup function;

Here, “a” represents the total number of PDSCHs and PDCCHs/EPDCCHs indicating DL SPS release in serving cells with the MIMO transmission mode detected by the UE, and “b” represents the SIMO transmission mode detected by the UE. Indicates the total number of PDSCHs and PDCCHs/EPDCCHs indicating DL SPS release in serving cells. “L” in equations (1) and (2) is the number of bits of UL DAI in the UL grant, or the number of bits of total DAI obtained from DL DCI, or the number of bits of reference DAI .

Example 3

In this embodiment, time and frequency resource weighting coefficients used for transmission of HARQ-ACK feedback information of each cell are determined according to the values of UL DAI, and the number of time and frequency resources occupied by HARQ-ACK feedback information is determined based on time and frequency resource weighting coefficients.

First, the number of bits of HARQ-ACK feedback information is determined based on the number of cells configured for the UE and the transmission modes configured for these cells, and is independent of UL DAI. When the UE is set to PUCCH format 3 and transmits HARQ-ACK, or the UE is set to PUCCH format X and transmits HARQ-ACK, in HARQ-ACK transmission on PUSCH, and a cell with SIMO transmission mode where the number of bits needed to transmit its HARQ-ACK feedback information is 1; Also, for a cell with MIMO transmission mode, the number of bits needed to transmit its HARQ-ACK feedback information is 2. The number M of bits required to transmit HARQ-ACK feedback information of all cells configured for the UE in an uplink subframe is calculated based on the transmission modes of all cells configured for the UE. If the number M of bits required to transmit HARQ-ACK feedback information of all cells of the UE calculated based on the transmission modes of all cells is N or less (e.g., in the case of PUCCH format 3, N = 20), The HARQ-ACK feedback information of all of the cells need not be spatially bundled, so for a cell with SIMO transmission mode, the number of bits of its HARQ-ACK feedback information is 1; Also, for a cell with MIMO transmission mode, the number of bits of its HARQ-ACK feedback information is 2. The number M of bits required to transmit HARQ-ACK feedback information of all cells configured for the UE is calculated based on the transmission modes of all cells configured for the UE. If the number M of bits required to transmit HARQ-ACK feedback of all cells configured for the UE calculated according to the transmission modes of all cells configured for the UE is greater than N (e.g., in the case of PUCCH format 3, N=20), HARQ-ACK information of cells with MIMO transmission mode needs to be spatially bundled. Therefore, for a cell with SIMO transmission mode, the number of bits of its HARQ-ACK feedback information is 1; Also, for a cell with MIMO transmission mode, the number of bits of its HARQ-ACK feedback information is 1. Of course, for a cell with MIMO transmission mode, as in Embodiment 2, whether its HARQ-ACK information needs to be spatially bundled for transmission is set by upper layer signaling or physical layer signaling. It can be indicated by . Below, a method for determining time and frequency resource weighting coefficients used to transmit HARQ-ACK feedback information of each cell in PUSCH according to the value of UL DAI will be described.

If the UE is set to PUCCH format 3 and transmits HARQ-ACK, or the UE is set to PUCCH format For -ACK transmission, or for HARQ-ACK transmission on PUSCH not scheduled by the detected PDCCH/EPDCCH, the time and frequency resource weighting factor is 1. If the UE is set to PUCCH format 3 and transmits HARQ-ACK, or if the UE is set to PUCCH format For ACK transmission, time and frequency resource weighting factors are determined according to the value of UL DAI. Table 2 shows the correspondence between UL DAIs and time and frequency resource weighting coefficients.

Table 2: Correspondence between UL DAIs and time and frequency resource weighting coefficients

UL DAI value ( ） Time and frequency resource weighting factors One 1/4 2 2/4 3 3/4 4 4/4

As can be seen from the above, the time and frequency resource weighting factors include:

If the UE is set to PUCCH format 3 or format The time and frequency resource weighting coefficients corresponding to the UL DAI carried in the PDCCH/EPDCCH scheduling the uplink subframe are determined according to a preset correspondence relationship between the UL DAIs and the time and frequency resource weighting coefficients, where The established correspondence relationship may be as shown in Table 2, but this correspondence relationship is not limited to this and may be configured as needed; also

The UE is set to PUCCH format 3 or format If the UE's transmission is not scheduled by the detected PDCCH/EPDCCH, the time and frequency resource weighting factors are set to 1.

The number of time and frequency resources occupied by the transmission of HARQ-ACK feedback in the PUSCH of the present invention is obtained by multiplying the time and frequency resources by the time and frequency resource weighting coefficients determined according to the prior art.

As can be seen from the above-described embodiments, the method for transmitting HARQ-ACK feedback information provided according to the present invention is to transmit HARQ-ACK feedback information according to the value of the UL DAI of the cell to which the PUSCH that transmits HARQ-ACK feedback information belongs. Determines the number of time and frequency resources occupied by ACK feedback information and the length of the HARQ-ACK feedback information, thereby appropriately providing HARQ-ACK feedback in a CA system with different uplink and downlink settings for multiple cells. information is transmitted, and the uplink and downlink settings for multiple CCs in the CA support different situations more efficiently.

The above is an implementation example of the HARQ-ACK transmission methods of the present invention. The present invention also provides a HARQ-ACK transmission device of an improved carrier aggregation system implementing the above-described transmission methods. The basic structure of this device includes a receiving unit, a bit number determination unit, and a transmitting unit. And the operations of the receiving unit, the number of bits determining unit, and the transmitting unit may be controlled, for example, through a controller of the terminal.

The receiving unit is configured to receive PDCCH/EPDCCH and PDSCH transmitted from the base station. The bit number determination unit determines the number of bits of HARQ-ACK feedback information to be transmitted in the PUSCH or PUCCH by all cells configured by the UE in the current uplink subframe, based on the UL DAI obtained from the UL grant, and , Based on the transmission modes or the number of cells configured for the UE, determine the number of PDCCH/EPDCCH and PDSCH subframes indicating SPS release received in the HARQ-ACK bundling window. The transmitting unit is configured to transmit HARQ-ACK feedback information of all cells in the PUSCH or PUCCH of the current downlink subframe.

The base station corresponding to the terminal may be implemented including a transceiver and a controller, and the controller of the base station provides control information for determining bits of HARQ-ACK feedback information to the terminal according to the above-described embodiments, and provides feedback from the terminal. Controls the operation of receiving transmitted HARQ-ACK feedback information.

The foregoing description is only an embodiment of the present invention and should not be construed as limiting the present invention. Any changes, equivalent replacements, and modifications made without departing from the scope and spirit of the present invention are intended to be included within the protection scope of the present invention.

Claims (24)

In a method for a terminal to transmit HARQ-ACK (hybrid automatic repeat request acknowledgment) information in a wireless communication system,
Receiving higher layer signaling including first information and second information;
Identifying whether the first information and the second information indicating whether to apply HARQ-ACK spatial bundling to the higher layer signaling are included;
At least one HARQ-ACK information bit corresponding to downlink data received in at least one cell, based on whether the first information and the second information are included in the higher layer signaling. determining; and
Transmitting HARQ-ACK information corresponding to the determined at least one HARQ-ACK information bit,
The first information indicates whether to apply HARQ-ACK spatial bundling to HARQ-ACK to be transmitted through PUCCH (physical uplink control channel),
The second information indicates whether to apply HARQ-ACK spatial bundling to HARQ-ACK to be transmitted through PUSCH (physical uplink shared channel).
The method of claim 1, wherein the higher layer signaling is signaling from a layer higher than the physical layer.
According to claim 1,
The step of determining the at least one HARQ-ACK information bit is:
Determining the number of HARQ-ACK information bits corresponding to downlink data received in the at least one cell when HARQ-ACK spatial bundling is applied; and
A method comprising determining the number of HARQ-ACK information bits corresponding to downlink data received in the at least one cell when HARQ-ACK spatial bundling is not applied.
According to claim 1,
The method wherein the total number of the at least one HARQ-ACK information bit is determined based on the number of the at least one cell.
In a method for a base station to receive HARQ-ACK (hybrid automatic repeat request acknowledgment) information in a wireless communication system,
Transmitting higher layer signaling including first information and second information to the terminal; and
Receiving HARQ-ACK information from the terminal in response to downlink data of at least one cell,
The first information indicates whether to apply HARQ-ACK spatial bundling to HARQ-ACK information to be transmitted through a physical uplink control channel (PUCCH),
The second information indicates whether to apply HARQ-ACK spatial bundling to HARQ-ACK information to be transmitted through PUSCH (physical uplink shared channel).
The method of claim 1, wherein the higher layer signaling is signaling from a layer higher than the physical layer.
In a terminal transmitting HARQ-ACK (hybrid automatic repeat request acknowledgment) information in a wireless communication system,
The terminal is,
Transmitter and receiver; and
It includes a control unit coupled to the transceiver unit,
The control unit,
Receive upper layer signaling including first information and second information,
Identify whether the first information and the second information indicating whether to apply HARQ-ACK spatial bundling to the higher layer signaling are included,
At least one HARQ-ACK information bit corresponding to downlink data received in at least one cell, based on whether the first information and the second information are included in the higher layer signaling. Decide,
Transmitting HARQ-ACK information corresponding to the determined at least one HARQ-ACK information bit,
The first information indicates whether to apply HARQ-ACK spatial bundling to HARQ-ACK to be transmitted through PUCCH (physical uplink control channel),
The second information indicates whether to apply HARQ-ACK spatial bundling to HARQ-ACK to be transmitted through PUSCH (physical uplink shared channel).
The higher layer signaling is signaling from a higher layer of the physical layer.
According to claim 5,
The control unit,
Determine the number of HARQ-ACK information bits corresponding to downlink data received in the at least one cell when HARQ-ACK spatial bundling is applied, or
A terminal that determines the number of HARQ-ACK information bits corresponding to downlink data received in the at least one cell when HARQ-ACK spatial bundling is not applied.
According to claim 5,
A terminal in which the total number of the at least one HARQ-ACK information bit is determined based on the number of the at least one cell.
In a base station that receives HARQ-ACK (hybrid automatic repeat request acknowledgment) information in a wireless communication system,
The base station is,
Transmitter and receiver; and
It includes a control unit coupled to the transceiver unit,
The control unit,
Transmit higher layer signaling including first information and second information to the terminal,
Receiving HARQ-ACK information from the terminal in response to downlink data of at least one cell,
The first information indicates whether to apply HARQ-ACK spatial bundling to HARQ-ACK information to be transmitted through a physical uplink control channel (PUCCH),
The second information indicates whether to apply HARQ-ACK spatial bundling to HARQ-ACK information to be transmitted through PUSCH (physical uplink shared channel).
The base station, wherein the higher layer signaling is signaling from a layer higher than the physical layer. delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete

Images