CN109474371B - HARQ-ACK information feedback method and device - Google Patents
HARQ-ACK information feedback method and device Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0028—Formatting
- H04L1/0029—Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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Abstract
The application discloses a HARQ-ACK information feedback method, which is characterized by comprising the following steps: the UE determines the bit number of the HARQ-ACK feedback information transmitted on the uplink subframe n and the physical PUCCH resource for transmitting the HARQ-ACK feedback information; the UE determines a PUCCH power adjustment value for transmitting the HARQ-ACK feedback information according to a transmission power control TPC and total DL DAI shared field in downlink DL downlink transmission information DCI of a scheduling PDSCH or a PDCCH indicating semi-static SPS release; the UE transmits the HARQ-ACK on the uplink subframe n according to the determined bit number, PUCCH resources and PUCCH power adjustment values; wherein the TPC and total DL DAI common field is used only for transmitting TPC commands or total DL DAI.
Description
Technical Field
The present invention relates to wireless communication system technologies, and in particular, to a method and apparatus for feeding back HARQ-ACK information.
Background
A Long Term Evolution (LTE) system supports two duplexing modes, frequency Division Duplexing (FDD) and Time Division Duplexing (TDD). Fig. 1 is a frame structure of a TDD system. Each radio frame is 10ms in length and equally divided into two half frames of length 5 ms. Each half frame contains 8 slots of length 0.5ms and 3 special domains, namely a downlink pilot time slot (DwPTS), a guard interval (GP) and an uplink pilot time slot (UpPTS), and the sum of the lengths of the 3 special domains is 1ms. The transmission in the LTE system includes: a transmission from a base station to a User Equipment (UE) (referred to as a downlink transmission), a corresponding subframe is referred to as a downlink subframe, and a transmission from a UE to a base station (referred to as an uplink transmission), a corresponding subframe is referred to as an uplink subframe.
In downlink communication of the LTE-a system, reliability of downlink data reception is ensured by a hybrid automatic repeat request (HARQ, hybrid Automatic Repeat reQuest) technique. The downlink data is transmitted by the base station to the UE through a downlink physical shared channel (PDSCH, physical Downlink Shared Channel), and the UE tells the base station whether the UE correctly receives the PDSCH by transmitting hybrid automatic repeat request Acknowledgement (HARQ-ACK, hybrid Automatic Repeat request-Acknowledgement) feedback information, and the HARQ-ACK information is transmitted by the UE to the base station through a physical uplink control channel (PUCCH, physical Uplink Control Channel).
For each transport block (Transmission Block, TB) in the received PDSCH, or the received PDCCH indicating SPS (Semi-Persistent Scheduling) release (hereinafter both referred to as downlink HARQ transmission), the UE needs to feed back an ACK (correct reception) bit or a NACK (erroneous reception or loss) bit, hereinafter referred to as HARQ-ACK bit, to the base station through the corresponding uplink subframe, and if the eNB receives the NACK bit, the transport block corresponding to NACK or the PDCCH indicating SPS release will be retransmitted.
When the UE transmits the HARQ-ACK feedback information through the PUCCH, the UE needs to know the PUCCH resource for transmitting the HARQ-ACK, and the PUCCH for transmitting the HARQ-ACK can be obtained in an implicit mode or an explicit mode, wherein the implicit mode is obtained by index mapping of the lowest control channel element (CCE, control Channel Element) of a physical downlink control channel (PDCCH, physical Downlink Control Channel) of a scheduling PDSCH; the explicit method is to configure a set of PUCCH resources through higher layer signaling, and then indicate one PUCCH resource in the set of PUCCHs configured by the higher layer signaling through a field (this field is called HARQ-ACK resource indication, ARI, HARQ-ACK Resource Indicator) in downlink control information (DCI, downlink Control Information) in a PDCCH for scheduling PDSCH. In addition, a PUCCH to which HARQ-ACK is transmitted is subjected to power control, and the power of the transmitted PUCCH is adjusted by a transmission power control (TPC, transmission Power Control) field in DCI in a PDCCH of a scheduled PDSCH. In LTE-a, the ARI and TPC share a common field, i.e., in some DCIs, the common field is used as TPC, and in some DCIs, the common field is used as ARI, because HARQ-ACKs of PDSCH scheduled by multiple DCIs are transmitted in the same PUCCH, and it is sufficient that an ARI indication resource in one DCI is transmitted once, and TPC adjustment power in one DCI is transmitted once, for example, TPC in DCI with downlink allocation index (DL DAI, downlink Downlink Assignment Index) equal to 1 is used as TPC, and TPC in DCI with DL DAI not equal to 1 is used as ARI. Implicit PUCCH resources may be used when only HARQ-ACKs of DCI scheduled PDSCH with DL DAI equal to 1 need to be transmitted.
Since the HARQ-ACK feedback information of the PDSCH of the multiple serving cells and the multiple downlink slots of each serving cell is transmitted in the PUCCH of one uplink slot, the number of bits of the HARQ-ACK feedback information transmitted in the PUCCH of one uplink slot is to be determined, so that the understanding of the base station and the UE are consistent, one way is to determine the number of bits of the HARQ-ACK feedback information through a higher layer signaling configuration, the other way is to dynamically determine the number of bits of the HARQ-ACK feedback information, at this time, DL DAI assistance needs to be introduced to enable the base station and the UE to perform consistent understanding of the number of bits of the HARQ-ACK feedback information, the DL DAI may include a count DL DAI (called counter DL DAI) and a total DL DAI (total DL DAI), the count DL DAI refers to the number of the currently transmitted DCI, the schedule and the PDCCH indicating release, the total number of the schedule and the PDCCH indicating release until the currently located slot, the DL DAI is the same as the total number of the DL DAI, the DL DAI refers to the same figure in the same figure as the DL DAI, the DL DAI 2.
In a New wireless (NR, new Radio) communication system, since the HARQ-ACK timing relationship is dynamically determined, PUCCH resources for transmitting HARQ-ACKs are all explicitly indicated, and there is no implicit PUCCH resource for HARQ-ACK transmission, and an ARI field must be included in each DCI to indicate PUCCH resources, and at this time, how to transmit TPC is still not an ideal solution.
Disclosure of Invention
The application provides a feedback method and equipment for HARQ-ACK information, which can effectively transmit TPC commands.
A HARQ-ACK information feedback method comprises the following steps:
the UE determines the bit number of the HARQ-ACK feedback information transmitted on an uplink subframe n and the Physical Uplink Control Channel (PUCCH) resource for transmitting the HARQ-ACK feedback information;
the UE determines a PUCCH power adjustment value for transmitting the HARQ-ACK feedback information according to a transmission power control TPC and total number DL DAI shared field in downlink DL downlink transmission information DCI of a scheduling physical downlink shared channel PDSCH or a PDCCH indicating semi-static SPS release;
the UE transmits the HARQ-ACK on the uplink subframe n according to the determined bit number, PUCCH resources and PUCCH power adjustment values;
wherein the TPC and total DL DAI common field is used only for transmitting TPC commands, or the TPC and total DL DAI common field is used for transmitting TPC commands or total DL DAI values; and n is a subframe index.
Preferably, when a total DL DAI exists in the DL DCI, the TPC and total DL DAI shared field is used to transmit TPC commands or total DL DAI values; and/or the number of the groups of groups,
When the total DL DAI does not exist in the DL DCI, the TPC and total DL DAI shared field is used only for transmitting TPC commands.
Preferably, when the TPC and total DL DAI common field is used only for transmitting TPC commands, the determining the PUCCH power adjustment value according to the TPC and total DL DAI common field includes:
when the DL DAI domain exists in the PDCCH, the UE takes information carried by the appointed TPC and total DL DAI shared field in all the received PDCCHs as a TPC command, and the other TPC and total DL DAI shared fields are taken as reserved fields; and/or the number of the groups of groups,
when the DL DAI domain does not exist in the PDCCH, the UE takes the information carried by the shared field of TPC and total DL DAI in all PDCCHs of all the received service cells as a TPC command; or, for the information carried by the designated TPC and total DL DAI shared field in all PDCCHs received by the UE, the remaining TPC and total DL DAI shared field is used as a reserved field.
Preferably, when there is a DL DAI field in the PDCCH, the specified TPC and total DL DAI shared field is: when the service cell where the PDCCH with the first count DL DAI equal to 1 is located is a main cell, a main auxiliary cell or an auxiliary cell, the TPC and the total number DL DAI included in the corresponding PDCCH share a field; or, the common field of all TPCs and total DL DAIs in all PDCCHs received by the UE;
And/or the number of the groups of groups,
when there is no DL DAI field in the PDCCH, the specified TPC and total DL DAI shared field is: when the serving cell where the received PDCCH is located is a primary cell or a primary secondary cell, the TPC and the total DL DAI included in the corresponding PDCCH share a field.
Preferably, when the TPC and total DL DAI common field is used for transmitting TPC commands or total DL DAI values, the determining the PUCCH power adjustment value according to the TPC and total DL DAI common field includes:
and the UE takes information carried by the shared field of the designated TPC and the total DL DAI in all the received PDCCHs as a TPC command, and the information carried by the shared field of the rest TPCs and the total DL DAI as a total DL DAI value.
Preferably, the specified TPC and total DL DAI common field is: when the serving cell where the PDCCH with the received first count DL DAI equal to 1 is located is a primary cell, a primary secondary cell or a secondary cell, the TPC and total DL DAI included in the corresponding PDCCH share a field.
Preferably, the determining the number of bits of the HARQ-ACK feedback information includes:
in a first mode, the UE receives a set formed by all downlink timeslots for which HARQ-ACK needs to be fed back in the uplink subframe n, and determines the number of bits of the HARQ-ACK feedback information in the uplink subframe n according to the set or a transmission mode configured by each serving cell;
Or, the second mode is that the UE determines according to the count DL DAI and the total DL DAI in the received PDCCH;
or the UE determines to select one mode from the mode one and the mode two according to the received high-layer signaling, and determines the bit number of the HARQ-ACK feedback information.
Preferably, the determining the number of bits according to the set and the transmission mode configured by each serving cell includes:
if the DL DAI field exists in the PDCCH, when the UE determines that the HARQ-ACK feedback information transmission exists in one downlink time slot of only one service cell in the uplink subframe n, determining that the bit number of the HARQ-ACK feedback information is q; when the UE determines that at least two downlink time slots actually exist in the uplink subframe n for HARQ-ACK feedback information transmission, taking the sum of the numbers of HARQ-ACK feedback information bits corresponding to all the downlink time slots included in the set as the determined number of the HARQ-ACK feedback information bits, and arranging the bits of the HARQ-ACK feedback information on the uplink subframe n according to the sequence of counting DL DAI from small to large;
if the DL DAI field does not exist in the PDCCH, taking the sum of the HARQ-ACK feedback information bit numbers corresponding to all downlink time slots included in the set as the determined HARQ-ACK feedback information bit number, and arranging the bits of the HARQ-ACK feedback information on the uplink subframe n according to the sequence of the time slots and the service cell;
Wherein q is determined according to the transmission mode of the one serving cell.
Preferably, the determining the number of bits of the HARQ-ACK feedback information according to the counted DL DAI and the total DL DAI includes:
when the UE determines that HARQ-ACK feedback information transmission exists in one downlink time slot of only one service cell in the uplink subframe n, determining that the bit number of the HARQ-ACK feedback information is q, and determining that the information carried by a shared field of TPC and total DL DAI of the PDCCH is a TPC command;
when the UE determines that at least two downlink time slots in the uplink subframe n have HARQ-ACK feedback information transmission, determining the bit number of the HARQ-ACK feedback information according to the count DL DAI and the total DL DAI; the information carried by the shared field of TPC and total DL DAI in the first PDCCH received in the first time slot is a TPC command, and the information carried by the shared field of TPC and total DL DAI in the PDCCH received in other time slots is a total DL DAI value.
Preferably, the determining the PUCCH resource for transmitting HARQ-ACK feedback information includes: determining a set of PUCCH resources according to high-level signaling configuration or system information indication, and determining one PUCCH resource in the set of PUCCH resources according to an ARI field, wherein the one PUCCH resource is used as the PUCCH resource for transmitting HARQ-ACK feedback information;
Wherein the ARI field is used only for transmitting ARI information.
An HARQ-ACK information feedback device, comprising: the device comprises a bit number determining unit, a resource determining unit, a power adjustment value determining unit and a transmission unit;
the bit number determining unit is configured to determine the bit number of HARQ-ACK feedback information transmitted on the uplink subframe n;
the resource determining unit is configured to determine a PUCCH resource for transmitting the HARQ-ACK feedback information;
the power adjustment value determining unit is configured to determine a PUCCH power adjustment value for transmitting the HARQ-ACK feedback information according to a common field of a total DL DAI and a transmission power control TPC in DL DCI of a scheduled PDSCH or a PDCCH indicating semi-persistent SPS release;
the transmission unit is configured to transmit the HARQ-ACK on the uplink subframe n according to the determined number of bits, PUCCH resource, and PUCCH power adjustment value;
wherein the TPC and total DL DAI common field is used only for transmitting TPC values, or the TPC and total DL DAI common field is used for transmitting TPC values or total DL DAI values; and n is a subframe index.
According to the technical scheme, the HARQ-ACK information feedback method provided by the invention can save signaling overhead by taking the common field of TPC and total DL DAI as TPC and total DL DAI when determining the method according to different numbers of bits of HARQ-ACK feedback information.
Drawings
Fig. 1 is a schematic diagram of a frame structure of a conventional TDD system;
FIG. 2 is a schematic diagram showing the meaning of the expression of two kinds of DL DAIs in the prior art;
fig. 3 is a basic flowchart of the HARQ-ACK feedback method of the present application;
fig. 4 is a diagram of the HARQ-ACK bit number transmitted in one uplink slot in embodiment 1;
fig. 5 is a diagram two of the HARQ-ACK bit number transmitted in one uplink time slot in embodiment 1;
fig. 6 is a diagram III of the number of HARQ-ACK bits transmitted in one uplink time slot in embodiment 1;
fig. 7 is a diagram illustrating the number of HARQ-ACK bits transmitted in one uplink slot in embodiment 2;
fig. 8 is an explanatory diagram of counting DL DAIs and total DL DAIs in embodiment 2;
fig. 9 is a basic structural diagram of the HARQ-ACK feedback device in the present application.
Detailed Description
In order to make the objects, technical means and advantages of the present application more apparent, the present application is further described in detail below with reference to the accompanying drawings.
According to the HARQ-ACK feedback mechanism defined by the current LTE standard, the UE uses the common field TPC as TPC and ARI, that is, when the first count DL DAI is equal to 1, the common field TPC is used as TPC to indicate the power adjustment value, and when the count DL DAI is other value, the common field TPC is used as ARI to indicate the PUCCH resource for transmitting HARQ-ACK, and when the UE receives only the DCI with the count DL DAI equal to 1, the UE transmits HARQ-ACK using implicit PUCCH resource, but in NR, no implicit PUCCH resource is available, so the UE cannot use the common field as TPC and ARI, and the UE needs a dedicated field as ARI to indicate the PUCCH resource for transmitting HARQ-ACK, so how TPC is transmitted is a problem to be solved. In order to solve this problem, the present application proposes a HARQ-ACK information feedback method, as shown in fig. 3, where the most basic HARQ-ACK information feedback method includes the following steps:
Step 210: the UE determines the bit number of HARQ-ACK feedback information;
preferably, determining the number of bits of the HARQ-ACK feedback information may take two ways (the UE may take one of two ways by determining from the received higher layer signaling): one of the methods is that the UE determines the set of all downlink timeslots that need or may need to be fed back to the HARQ-ACK by receiving the higher layer signaling configuration semi-statically, and then determines the number of bits of the HARQ-ACK feedback information together according to the transmission mode configured by each serving cell. With this method, the counted DL DAIs may exist in the DL DCI in the PDCCH scheduling PDSCH or indicating SPS release, then the bits of the HARQ-ACK are arranged in the order of the DL DAIs, or the counted DL DAIs do not exist in the DL DCI, then the bits of the HARQ-ACK are arranged in the order of the slots, since the number of bits of the HARQ-ACK is configured by higher layer signaling, the total number of DL DAIs does not exist in the DL DCI. This embodiment will be described in detail in the following embodiment 1.
Another way is for the UE to dynamically determine the total number of bits for the feedback HARQ-ACK for the uplink subframe n. For example, in order to prevent the base station and the UE from understanding the total number of bits of the uplink subframe n feedback HARQ-ACK differently, the total number of bits of the uplink subframe n feedback HARQ-ACK may be determined together by a combination of the counted DL DAI and the total DL DAI in DL DCI in a PDCCH that schedules PDSCH or indicates SPS release. This mode will be described in detail in the following embodiment 2.
Of course, the number of bits for determining the HARQ-ACK feedback information is not limited to the above two methods.
Step 220: the UE determines PUCCH resources for transmitting HARQ-ACK feedback information;
preferably, PUCCH resources for transmitting HARQ-ACK feedback information may be jointly determined by a higher layer signaling configuration (or system information indication) and a physical layer signaling indication.
In more detail, the UE may determine a set of one or more PUCCH resources of different formats or the same format by receiving a higher layer signaling (or a system information indication) and then determine one PUCCH resource of the PUCCH resource set as a transmission resource of the HARQ-ACK by receiving a physical layer signaling indication. For example, the UE determines, by receiving a higher layer signaling configuration, a PUCCH resource set S1, where the set S1 includes { S1, S2, S3, S4}4 PUCCH resources, a specific parameter of each PUCCH resource in the set is configured by the higher layer signaling, a specific parameter of each PUCCH resource may be the same or different, and a format of each PUCCH resource in the same set may be the same or different; when the UE configures more than one PUCCH resource set by receiving higher layer signaling, the formats of PUCCH resources within different sets are different. The physical layer signaling for indicating the PUCCH resource is referred to as ARI, which is preferably an independent field in DCI and is not shared with other fields.
Step 230: the UE determines a PUCCH power adjustment value for transmitting HARQ-ACK;
the PUCCH power adjustment value of the transmission HARQ-ACK is determined by TPC and total DL DAI common fields of DL DCI in the scheduling PDSCH or PDCCH indicating SPS release. In this application, the TPC command does not share the same field as the ARI indicating the PUCCH resource, but introduces a new field-TPC and total DL DAI sharing field. If the total DL DAI is present in the DCI, the TPC command or the total DL DAI value may be transmitted using a TPC and total DL DAI common field, that is, the TPC command and the total DL DAI share the same field, and if the total DL DAI is not present in the DCI, the TPC command is transmitted only through the TPC and total DL DAI common field, that is, the TPC command is transmitted on a separate field (that is, the TPC and total DL DAI common field) may be used.
Step 240: and the UE feeds back the HARQ-ACK information bit sequence according to the determined number of bits of the HARQ-ACK, the PUCCH resource for transmitting the HARQ-ACK feedback information and the PUCCH power adjustment value for transmitting the HARQ-ACK feedback information.
It should be specifically noted that, the present application does not restrict the time sequence of the UE executing the steps 210, 220 and 230, and the solution obtained by performing the sequence adjustment on one or more of the 3 steps is still within the scope of the present application.
In order to facilitate understanding of the present application, the following further describes the above technical solution of the present application in a mode of interaction between devices in combination with a specific application case, which is specifically as follows:
example 1:
in this embodiment, the number of HARQ-ACK bits for the UE is semi-statically determined. The embodiment steps of a specific HARQ-ACK transmission are as follows:
step 310: the UE determines the HARQ-ACK bit number;
if the PDCCH has the counting DL DAI domain, the HARQ-ACK bit number of the UE is determined semi-statically according to the high-layer signaling configuration. For example, the UE configures 4 serving cells, and the bundling window of each serving cell is 4, that is, each serving cell has HARQ-ACK feedback information of 4 downlink timeslots to be transmitted in one uplink timeslot, that is, the set of all downlink timeslots for which feedback of HARQ-ACK is required or may be required in the uplink subframe n includes 16 downlink timeslots of 4 serving cells; the number of bits counting DL DAI field in PDCCH is 2, the HARQ-ACK bits of UE are arranged in order of DL DAI from small to large, and the number of bits of HARQ-ACK in each downlink slot of each serving cell is 1, so that the total number of bits of HARQ-ACK transmitted in PUCCH of one uplink slot is 4*4 =16 bits, as shown in fig. 4. When the UE determines that the base station transmits PDSCH or PDCCH indicating SPS release only in one downlink slot of one serving cell (e.g., the UE receives PDCCH with a count DL DAI equal to 1 only), i.e., the HARQ-ACK feedback information is transmitted in only one downlink slot of one serving cell, the number of bits of the HARQ-ACK feedback information is q (q may be 1 or 2, determined according to the transmission mode of the serving cell, e.g., q is 1 when the transmission mode of the serving cell supports one transport block transmission, and q is 2 when the transmission mode of the serving cell supports two transport block transmissions), as shown in fig. 5. When the UE determines that the base station transmits PDSCH or PDCCH indicating SPS release in at least two downlink timeslots of one serving cell or multiple serving cells in the 4 serving cells, that is, HARQ-ACK feedback information is transmitted in at least two downlink timeslots, the number of bits of HARQ-ACK feedback information is the total number of HARQ-ACK bits corresponding to all downlink timeslots in the foregoing set, that is, 16, as shown in fig. 6.
If the DL DAI field is not counted in the PDCCH, the number of bits of the HARQ-ACK feedback information is the total number of HARQ-ACK bits corresponding to all downlink timeslots in the set, i.e. 16, no matter whether the UE receives the PDCCH on only one timeslot of one serving cell, the bits of the HARQ-ACK feedback information are arranged according to the sequence of the timeslots and the serving cell. Since the UE may miss the first PDCCH if the base station sends two PDCCHs, the UE is also unaware of the miss, and misunderstanding may occur between the base station and the UE.
Step 320: the UE determines PUCCH resources for transmitting HARQ-ACK;
if the UE detects the PDCCH in a downlink timeslot, the UE acquires the state of the ARI field in the PDCCH, and possibly acquires the DL DAI, where the ARI field includes 2 bits, and the mapping relationship between the state of the ARI field and the PUCCH resource is defined in this embodiment as shown in table 1 without losing generality. And finding corresponding PUCCH resources according to the mapping relation from the ARI domain to the PUCCH resources in table 1, and transmitting HARQ-ACK.
The UE only receives one set of 4 PUCCH resources configured by a higher layer signaling, which are PUCCH resources { s }, respectively 1 ，s 2 ，s 3 ，s 4 The PUCCH formats of the resources of different PUCCHs in this set of resources may be different, e.g., PUCCH resource s 1 Is a short PUCCH resource, transmits at most 2-bit HARQ-ACK feedback information, s 2 ，s 3 ，s 4 Is a long PUCCH resource, and the number of bits of the transmitted bit HARQ-ACK feedback information is greater than 2. The PUCCH formats of the resources of the different PUCCHs in this set of resources may be the same, s 1 ，s 2 ，s 3 ，s 4 Is a long PUCCH resource, and the number of bits of the transmitted bit HARQ-ACK feedback information is greater than 2.
Table 1: mapping relation of ARI domain to PUCCH resource
The UE receives the high-layer signaling to configure at least two sets of PUCCH resources, each set containing 4 PUCCH resources, for example, PUCCH resources contained in set 1 are { s11, s12, s13, s14}, PUCCH formats of different PUCCH resources in this set of resources are the same, PUCCH resources contained in set 2 are { s21, s22, s23, s24}, PUCCH formats of different PUCCH resources in this set of resources are the same, PUCCH resources in set 1 and PUCCH resources in set 2 are different, for example, PUCCH resources in set 1 are short PUCCH formats, at most 2 bits of HARQ-ACK feedback information are transmitted, PUCCH resources in set 2 are long PUCCH formats, and the number of transmitted HARQ-ACK feedback information bits is greater than 2. The UE determines the set of PUCCH resources to use according to the received PDCCH, that is, the ARI in the PDCCH indicates PUCCH resources in different sets in different cases, for example, when the UE receives only the PDCCH in one slot and the count DL DAI in the PDCCH is equal to 1, the ARI in the PDCCH is considered to indicate PUCCH resources in set 1, and in other cases, the ARI in the PDCCH indicates PUCCH resources in set 2.
If there is no DL DAI field in the PDCCH, the ARI can only indicate PUCCH resources in one set, since the UE cannot determine whether there is a missed PDCCH at this time.
Step 330: the UE determines a PUCCH power adjustment value for transmitting HARQ-ACK feedback information on a time slot n;
in this embodiment, a TPC and total DL DAI shared field is introduced in the PDCCH, and since the HARQ-ACK bit number is determined semi-statically at this time, the UE does not need to determine the number of bits of the HARQ-ACK using the total DL DAI, and this field may only transmit TPC commands (this field may also be referred to as TPC field).
When the counting DL DAI domain exists in the PDCCH, the UE takes the information carried by a part of appointed TPC and total DL DAI shared field in all received PDCCHs as a TPC command. The case where the TPC and total DL DAI shared fields are specified may be as follows: when the serving cell where the PDCCH with the first count DL DAI equal to 1 is located is a primary cell (Pcell) and a primary secondary cell (PScell), wherein a TPC and total DL DAI shared field is a designated TPC and total DL DAI shared field, and information carried on the corresponding field is taken as a TPC command to adjust a PUCCH power adjustment value for transmitting HARQ-ACK; the TPC and total DL DAI fields of other cases share a field as a reserved field. Alternatively, the specified TPC and total DL DAI common fields may be the following: when the serving cell where the PDCCH with the first count DL DAI equal to 1 is located is a primary cell (Pcell), a primary secondary cell (PScell) and a secondary cell (Scell), wherein a TPC and total DL DAI shared field is a designated TPC and total DL DAI shared field, and information carried on the corresponding field is taken as a TPC command and is used for adjusting a PUCCH power adjustment value for transmitting HARQ-ACK; the TPC and total DL DAI fields of other cases share a field as a reserved field. With this approach, the chance of transmitting TPC commands can be increased, since at this time if the UE does not schedule data on the primary cell, the transmission power of the PUCCH can still be adjusted by TPC commands in the PDCCH of the secondary cell scheduling data. Alternatively, it is also possible that the specified TPC and total DL DAI common fields are as follows: the common fields of TPC and DL DAI in all PDCCHs received by the UE are the common fields of appointed TPC and total DL DAI, and the information carried on the corresponding fields is taken as a TPC command and is used for adjusting the PUCCH power adjustment value of the transmission HARQ-ACK. With this method, the transmission power of the PUCCH can be more quickly adjusted because the power adjustment values of the plurality of TPC commands can be superimposed.
When the counting DL DAI domain does not exist in the PDCCH, the common field of TPC and total DL DAI in all PDCCHs of any service cell received by the UE is used as a TPC command for adjusting the PUCCH power adjustment value of the transmission HARQ-ACK, or the information carried by the common field of TPC and total DL DAI is designated as the TPC command for part of all PDCCHs received by the UE, and the common field of the rest TPC and total DL DAI is used as a reserved field. The case where the TPC and total DL DAI shared fields are specified may be as follows: when the serving cell where the PDCCH received by the UE is located is a primary cell (Pcell), and a primary secondary cell (PScell), wherein a TPC and total DL DAI shared field is a designated TPC and total DL DAI shared field, and information carried on the corresponding field is taken as a TPC command to adjust a PUCCH power adjustment value for transmitting HARQ-ACK; the remaining TPC and total DL DAI share a field as a reserved field. With this method, the transmission power of the PUCCH can be more quickly adjusted because the power adjustment values of the plurality of TPC commands can be superimposed.
In the above process, the fields corresponding to the newly introduced TPC and total DL DAI are used only for transmitting TPC commands, i.e. as a separate TPC field.
Example 2:
in this embodiment, the number of HARQ-ACK bits of the UE is dynamically determined. The embodiment steps of a specific HARQ-ACK transmission are as follows:
step 410: the UE determines the HARQ-ACK bit number;
the number of HARQ-ACK bits of the UE is dynamically determined according to the counted DL DAIs and the total DL DAIs in the PDCCH received by the UE.
For example, the UE configures 4 serving cells, HARQ-ACK feedback information of the 4 serving cells is transmitted in one uplink timeslot, the number of bits of the counting DL DAI field is 2, and when the number of bits of the counting DL DAI field is 2, it is assumed that the transmission modes of the 4 serving cells support one transmission block transmission, that is, the number of bits of the HARQ-ACK of one downlink timeslot of one serving cell is 1, so when the UE in the 4 serving cells, the UE confirms that the base station transmits PDSCH in two downlink timeslots of at least one serving cell or multiple serving cells or indicates PDCCH released by SPS (for example, the UE only receives PDCCH with the count DL DAI equal to 1), that is, when the number of bits of the HARQ-ACK feedback information transmitted in the two downlink timeslots of at least one serving cell or multiple serving cells is 2, the total number of bits of HARQ-ACK transmitted in one uplink timeslot can be obtained according to the count DL DAI and the total number of the DL DAI in the UE, as shown in fig. 7, the UE confirms that the base station transmits the number of the DL DAI and the total number of the dadl DAI in the PDCCH received in the 4 serving cells, wherein the count DL DAI is 1, and the total number of the two is 1, and the total number of the DL DAI is calculated as the total number of the DL 1, and the total number of the 2 is calculated as the total number of the DL DAI in the number of the PDCCH and the total number of the DL and the 2.
For example, when the UE determines that the base station transmits PDSCH or PDCCH indicating SPS release only in one downlink slot of one serving cell (e.g., the UE receives PDCCH with a count DL DAI equal to 1 only), i.e., only one downlink slot of one serving cell has HARQ-ACK feedback information transmission, the number of bits of HARQ-ACK feedback information is q (q may be 1 or 2, determined according to the transmission mode of the serving cell, e.g., q is 1 when the transmission mode of the serving cell supports one transport block transmission, and q is 2 when the transmission mode of the serving cell supports two transport block transmissions), as shown in fig. 5. The TPC and total DL DAI shared field at this time is used as a TPC command to adjust PUCCH transmission power because the total number of bits of HARQ-ACK does not need to be calculated based on the total DL DAI at this time.
Step 420: the UE determines PUCCH resources for transmitting HARQ-ACK;
if the UE detects the PDCCH in a downlink timeslot, the UE acquires the state of the ARI field in the PDCCH, where in this embodiment, the ARI field includes 2 bits, and the mapping relationship between the state of the ARI field and the PUCCH resource is defined in this embodiment as shown in table 2 without losing generality. And finding corresponding PUCCH resources according to the mapping relation from the ARI domain to the PUCCH resources in table 2, and transmitting HARQ-ACK.
The UE only receives one set of 4 PUCCH resources configured by a higher layer signaling, which are PUCCH resources { s }, respectively 1 ，s 2 ，s 3 ，s 4 The PUCCH formats of the resources of the different PUCCHs in this set of resources may be different, e.g. PUCCH resource s1 is a short PUCCH resource transmitting at most 2 bits of HARQ-ACK feedback information s 2 ，s 3 ，s 4 Is a long PUCCH resource, and the number of bits of the transmitted bit HARQ-ACK feedback information is greater than 2. The PUCCH formats of the resources of the different PUCCHs in this set of resources may be the same, s 1 ，s 2 ，s 3 ，s 4 Is a long PUCCH resource, and the number of bits of the transmitted bit HARQ-ACK feedback information is greater than 2.
Table 2: mapping relation of ARI domain to PUCCH resource
The UE receives a set of higher layer signaling configured with at least two PUCCH resources, each set containing 4 PUCCH resources, e.g. set 1 contains PUCCH resources { s } 11 ，s 12 ，s 13 ，s 14 The PUCCH formats of the resources of different PUCCHs in this resource set are the same, and the PUCCH resources contained in set 2 are { s } 21 ，s 22 ，s 23 ，s 24 The PUCCH formats of the different PUCCH resources in this resource set are the same, the PUCCH resources in set 1 and the PUCCH resources in set 2 are different, for example, the PUCCH resources in PUCCH resource set 1 are short PUCCH formats, at most 2 bits of HARQ-ACK feedback information are transmitted, the PUCCH resources in PUCCH resource set 2 are long PUCCH formats, and the number of transmitted HARQ-ACK feedback information bits is greater than 2. The UE determines the set of PUCCH resources to use according to the received PDCCH, that is, the ARI in the PDCCH indicates PUCCH resources in different sets in different cases, for example, when the UE receives only the PDCCH in one slot and the count DL DAI in the PDCCH is equal to 1, the ARI in the PDCCH is considered to indicate PUCCH resources in set 1, and in other cases, the ARI in the PDCCH indicates PUCCH resources in set 2.
Step 430: the UE determines a PUCCH power adjustment value for transmitting HARQ-ACK feedback information on a time slot n;
in this embodiment, a TPC and total DL DAI shared field is introduced in the PDCCH, and this field may be used to transmit only TPC commands, or may be used to transmit TPC commands or total DL DAI.
Specifically, the UE may use information carried in a part of specified TPC and total DL DAI shared fields in all received PDCCHs as TPC commands, and information carried in the remaining TPC and total DL DAI shared fields as total DL DAI values
In more detail, the specified TPC and total DL DAI common fields may be the following: when the serving cell where the PDCCH with the first count DL DAI equal to 1 is located is a primary cell (Pcell), and a primary secondary cell (PScell), wherein the shared field of TPC and total DL DAI is the shared field of appointed TPC and total DL DAI, the information carried by the corresponding field is used as a TPC command to adjust the PUCCH power adjustment value of transmitting HARQ-ACK, and the shared field of TPC and total DL DAI in other cases is used as the total DL DAI.
Alternatively, it is also possible that the specified TPC and total DL DAI common fields are as follows: when the serving cell where the PDCCH with the first count DL DAI equal to 1 is located is a primary cell (Pcell), a primary secondary cell (PScell) and a secondary cell (Scell), wherein the shared field of TPC and total DL DAI is the shared field of appointed TPC and total DL DAI, the information carried by the corresponding field is used as a TPC command to adjust the PUCCH power adjustment value for transmitting HARQ-ACK, and the shared field of TPC and total DL DAI in other cases is used as total DL DAI. With this approach, the chance of transmitting TPC commands can be increased, since at this time if the UE does not schedule data on the primary cell, the transmission power of the PUCCH can still be adjusted by TPC commands in the PDCCH of the secondary cell scheduling data.
The above-mentioned case that the first count DL DAI is equal to 1 is because the number of bits of the count DL DAI is limited, and the number of PDCCHs actually received by the UE is greater than the number indicated by the count DL DAI, for example, the count DL DAI is 2 bits, and the maximum number that can be expressed is 4, so that when the UE receives 5 PDCCHs, the count DL DAI of the first PDCCH is equal to 1, the count DL DAI of the second PDCCH is equal to 2, the count DL DAI of the third PDCCH is equal to 3, the count DL DAI of the fourth PDCCH is equal to 4, the count DL DAI of the fifth PDCCH is equal to 1, the total number DL DAI in the PDCCHs of the first count DL DAI is equal to 1 is TPC, and the total number DL DAI in the PDCCHs of the second count DL DAI is equal to 1 is total number DL DAI, as shown in fig. 8.
The method is a specific implementation of the HARQ-ACK feedback method. The application also provides an HARQ-ACK feedback device, as shown in fig. 9, which includes: the device comprises a bit number determining unit, a resource determining unit, a power adjustment value determining unit and a transmission unit;
a bit number determining unit, configured to determine the bit number of HARQ-ACK feedback information transmitted on an uplink subframe n;
a resource determining unit, configured to determine a PUCCH resource for transmitting the HARQ-ACK feedback information;
A power adjustment value determining unit, configured to determine a PUCCH power adjustment value for transmitting the HARQ-ACK feedback information according to a common field of a total DL DAI and a transmission power control TPC in DL DCI of a scheduling PDSCH or a PDCCH indicating semi-persistent SPS release;
a transmission unit, configured to transmit the HARQ-ACK on the uplink subframe n according to the determined number of bits, PUCCH resource, and PUCCH power adjustment value;
wherein the TPC and total DL DAI common field is used only for transmitting TPC values, or the TPC and total DL DAI common field is used for transmitting TPC values or total DL DAI values; and n is a subframe index.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (36)
1. A method performed by a user equipment, UE, in a wireless communication system, the method comprising:
receiving a high-layer signaling, wherein the high-layer signaling configures the UE to semi-statically determine the bit number of hybrid automatic repeat request response (HARQ-ACK) information;
receiving a Physical Downlink Control Channel (PDCCH) of a serving cell indicating a release of a semi-persistent scheduling (SPS) Physical Downlink Shared Channel (PDSCH) or a reception of a scheduling PDSCH from a base station, wherein the PDCCH of the serving cell comprises a counting Downlink Allocation Index (DAI) field value of 1;
In case the HARQ-ACK information is used only for the SPS PDSCH release or the PDSCH reception,
determining the bit number of the HARQ-ACK information according to the corresponding downlink time slot;
determining a physical uplink control channel, PUCCH, power adjustment value for transmitting the HARQ-ACK information based on a transmission power control, TPC, field in the PDCCH of the serving cell; and
and sending a Physical Uplink Control Channel (PUCCH) comprising the HARQ-ACK information to the base station.
2. The method of claim 1, wherein the transmitting the PUCCH including the HARQ-ACK information comprises: and transmitting the PUCCH comprising the HARQ-ACK information by using the PUCCH resource set.
3. The method of claim 2, wherein the number of bits of the HARQ-ACK information is less than or equal to 2, wherein a first PUCCH resource set is used to transmit a PUCCH including the HARQ-ACK information.
4. The method of claim 2, wherein the number of bits of the HARQ-ACK information is greater than 2, wherein a second PUCCH resource set is used to transmit a PUCCH including the HARQ-ACK information.
5. The method of claim 1, wherein the HARQ-ACK information corresponds to a downlink slot set, and,
Determining the number of bits of the HARQ-ACK information according to the corresponding downlink slot includes:
based on the number of transport blocks configured to the serving cell of the UE, the number of bits of the HARQ-ACK information is determined according to the downlink time slots corresponding to the serving cell in the downlink time slot set.
6. The method of claim 1, further comprising:
and determining a PUCCH resource set corresponding to the PUCCH based on the bit number of the HARQ-ACK information.
7. The method of claim 6, wherein determining a PUCCH resource set comprises determining the PUCCH resource set as a first PUCCH resource set when the number of bits of the HARQ-ACK information is less than or equal to 2.
8. The method of claim 7, wherein determining a PUCCH resource set comprises determining the PUCCH resource set as a second PUCCH resource set different from the first PUCCH resource set when the number of bits of the HARQ-ACK information is greater than 2.
9. The method of claim 1, wherein a HARQ-ACK resource indication ARI field for indicating a PUCCH resource for transmitting the HARQ-ACK information is further included in the PDCCH.
10. A method performed by a base station in a wireless communication system, the method comprising:
Transmitting a Physical Downlink Control Channel (PDCCH) of a serving cell indicating release of a semi-persistent scheduling (SPS) Physical Downlink Shared Channel (PDSCH) or reception of the scheduling PDSCH to User Equipment (UE), wherein the PDCCH of the serving cell comprises a counting Downlink Allocation Index (DAI) field value of 1;
a physical uplink control channel PUCCH including hybrid automatic repeat request acknowledgement HARQ-ACK information is received from the UE,
wherein, in case that the HARQ-ACK information is used only for the SPS PDSCH release or the PDSCH reception, the number of bits of the HARQ-ACK information is determined according to a corresponding downlink slot, and a PUCCH power adjustment value for transmitting the HARQ-ACK information is determined based on a transmission power control TPC field in the PDCCH of the serving cell.
11. The method of claim 10, wherein the receiving the PUCCH including the HARQ-ACK information comprises: and receiving the PUCCH comprising the HARQ-ACK information by using the PUCCH resource set.
12. The method of claim 11, wherein the number of bits of the HARQ-ACK information is less than or equal to 2, wherein a first set of PUCCH resources is used to receive a PUCCH that includes the HARQ-ACK information.
13. The method of claim 11, wherein the number of bits of the HARQ-ACK information is greater than 2, wherein a second set of PUCCH resources is used to receive a PUCCH including the HARQ-ACK information.
14. The method of claim 10, wherein the HARQ-ACK information corresponds to a downlink slot set, and,
the number of bits of the HARQ-ACK information is determined according to a downlink slot corresponding to the serving cell in the downlink slot set based on the number of transport blocks configured to the serving cell of the UE.
15. The method of claim 10, wherein a PUCCH resource set corresponding to the PUCCH is determined based on a number of bits of the HARQ-ACK information.
16. The method of claim 15, wherein the PUCCH resource set is determined as a first PUCCH resource set when the number of bits of the HARQ-ACK information is less than or equal to 2.
17. The method of claim 16, wherein the PUCCH resource set is determined as a second PUCCH resource set different from the first PUCCH resource set when the number of bits of the HARQ-ACK information is greater than 2.
18. The method of claim 10, wherein the PDCCH further includes an HARQ-ACK resource indication ARI field for indicating a PUCCH resource for transmitting the HARQ-ACK information.
19. A user equipment, UE, the UE comprising:
a transceiver; and
at least one controller coupled with the transceiver and configured to:
receiving a high-layer signaling, wherein the high-layer signaling configures the UE to semi-statically determine the bit number of hybrid automatic repeat request response (HARQ-ACK) information;
receiving a Physical Downlink Control Channel (PDCCH) of a serving cell indicating a release of a semi-persistent scheduling (SPS) Physical Downlink Shared Channel (PDSCH) or a reception of a scheduling PDSCH from a base station, wherein the PDCCH of the serving cell comprises a counting Downlink Allocation Index (DAI) field value of 1;
in case the HARQ-ACK information is used only for the SPS PDSCH release or the PDSCH reception,
determining the bit number of the HARQ-ACK information according to the corresponding downlink time slot;
determining a physical uplink control channel, PUCCH, power adjustment value for transmitting the HARQ-ACK information based on a transmission power control, TPC, field in the PDCCH of the serving cell; and
and sending a Physical Uplink Control Channel (PUCCH) comprising the HARQ-ACK information to the base station.
20. The UE of claim 19, wherein the at least one controller is further configured to:
And transmitting the PUCCH comprising the HARQ-ACK information by using the PUCCH resource set.
21. The UE of claim 20, wherein the number of bits of the HARQ-ACK information is less than or equal to 2, wherein a first set of PUCCH resources is used to transmit a PUCCH that includes the HARQ-ACK information.
22. The UE of claim 20, wherein the number of bits of the HARQ-ACK information is greater than 2, wherein a second PUCCH resource set is used to transmit a PUCCH including the HARQ-ACK information.
23. The UE of claim 19, wherein the HARQ-ACK information corresponds to a downlink set of time slots, and the at least one controller is further configured to:
based on the number of transport blocks configured to the serving cell of the UE, the number of bits of the HARQ-ACK information is determined according to the downlink time slots corresponding to the serving cell in the downlink time slot set.
24. The UE of claim 19, wherein the at least one controller is further configured to:
and determining a PUCCH resource set corresponding to the PUCCH based on the bit number of the HARQ-ACK information.
25. The UE of claim 24, wherein the at least one controller is further configured to:
And when the bit number of the HARQ-ACK information is smaller than or equal to 2, determining the PUCCH resource set as a first PUCCH resource set.
26. The UE of claim 25, wherein the at least one controller is further configured to:
and when the bit number of the HARQ-ACK information is greater than 2, determining the PUCCH resource set as a second PUCCH resource set different from the first PUCCH resource set.
27. The UE of claim 19, wherein the PDCCH further includes an HARQ-ACK resource indication ARI field therein for indicating a PUCCH resource for transmitting the HARQ-ACK information.
28. A base station, the base station comprising:
a transceiver; and
at least one controller coupled with the transceiver and configured to:
transmitting a Physical Downlink Control Channel (PDCCH) of a serving cell indicating release of a semi-persistent scheduling (SPS) Physical Downlink Shared Channel (PDSCH) or reception of the scheduling PDSCH to User Equipment (UE), wherein the PDCCH of the serving cell comprises a counting Downlink Allocation Index (DAI) field value of 1; and
a physical uplink control channel PUCCH including hybrid automatic repeat request acknowledgement HARQ-ACK information is received from the user equipment UE,
wherein, in case that the HARQ-ACK information is used only for the SPS PDSCH release or the PDSCH reception, the number of bits of the HARQ-ACK information is determined according to a corresponding downlink slot, and a PUCCH power adjustment value for transmitting the HARQ-ACK information is determined based on a transmission power control TPC field in the PDCCH of the serving cell.
29. The base station of claim 28, wherein the at least one controller is further configured to:
and receiving the PUCCH comprising the HARQ-ACK information by using the PUCCH resource set.
30. The base station of claim 29, wherein the number of bits of the HARQ-ACK information is less than or equal to 2, wherein a first set of PUCCH resources is used to receive a PUCCH that includes the HARQ-ACK information.
31. The base station of claim 29, wherein the number of bits of the HARQ-ACK information is greater than 2, wherein a second set of PUCCH resources is used to receive a PUCCH comprising the HARQ-ACK information.
32. The base station of claim 28, wherein the HARQ-ACK information corresponds to a downlink time slot set, and,
the number of bits of the HARQ-ACK information is determined according to a downlink slot corresponding to the serving cell in the downlink slot set based on the number of transport blocks configured to the serving cell of the UE.
33. The base station of claim 28, wherein a PUCCH resource set corresponding to the PUCCH is determined based on a number of bits of the HARQ-ACK information.
34. The base station of claim 33, wherein the PUCCH resource set is determined as a first PUCCH resource set when the number of bits of the HARQ-ACK information is less than or equal to 2.
35. The base station of claim 34, wherein the PUCCH resource set is determined as a second PUCCH resource set different from the first PUCCH resource set when the number of bits of the HARQ-ACK information is greater than 2.
36. The base station of claim 28, wherein the PDCCH further includes an HARQ-ACK resource indication ARI field for indicating a PUCCH resource for transmitting the HARQ-ACK information.
Priority Applications (7)
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| CN201710806037.7A CN109474371B (en) | 2017-09-08 | 2017-09-08 | HARQ-ACK information feedback method and device |
| EP23197542.6A EP4271060A3 (en) | 2017-09-08 | 2018-09-10 | Transmission of harq-ack information |
| PCT/KR2018/010560 WO2019050363A1 (en) | 2017-09-08 | 2018-09-10 | Method, user equipment and base station for transmitting harq-ack information |
| KR1020207009671A KR20200040890A (en) | 2017-09-08 | 2018-09-10 | Method for transmitting HARQ-ACK information, user equipment and base station |
| US16/638,579 US20210152292A1 (en) | 2017-09-08 | 2018-09-10 | Method, user equipment and base station for transmitting harq-ack information |
| EP18854653.5A EP3676978B1 (en) | 2017-09-08 | 2018-09-10 | Transmission of harq-ack information |
| US18/357,618 US20230370208A1 (en) | 2017-09-08 | 2023-07-24 | Method, user equipment and base station for transmitting harq-ack information |
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| CN201710806037.7A CN109474371B (en) | 2017-09-08 | 2017-09-08 | HARQ-ACK information feedback method and device |
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| CN109474371B true CN109474371B (en) | 2024-01-19 |
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