CN110557228B - HARQ feedback method for uplink data, terminal equipment and network equipment - Google Patents
HARQ feedback method for uplink data, terminal equipment and network equipment Download PDFInfo
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- CN110557228B CN110557228B CN201910760318.2A CN201910760318A CN110557228B CN 110557228 B CN110557228 B CN 110557228B CN 201910760318 A CN201910760318 A CN 201910760318A CN 110557228 B CN110557228 B CN 110557228B
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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
- H04L1/18—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
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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Abstract
The application discloses a method for feeding back uplink data HARQ, which is used for a mobile communication system, wherein a downlink control channel comprises second information and/or third information; the second information comprises ACK/NACK feedback information of uplink data channels from X terminal devices, wherein X is a positive integer; the third information includes a parameter for controlling the uplink data channel. The application also provides the terminal equipment and the network equipment applying the method. In order to solve the problem of ACK/NACK feedback of a plurality of uplink HARQ processes, the invention provides a scheme for realizing the ACK/NACK information feedback of uplink data transmission of a base station for a terminal.
Description
Technical Field
The present application relates to the field of mobile communications technologies, and in particular, to a method for feeding back uplink data HARQ, and a network device and a terminal device using the same.
Background
As the 5G new air interface (NR) first edition standard is completed, 5G will gradually expand to different domains. One important direction is the use of unlicensed bands. Compared with the licensed frequency band, the unlicensed frequency band needs to consider coexistence between different systems, typically, a Wifi system, an LTE-based LAA system, and the like. In order to make various systems coexist harmoniously, regulatory bodies of various countries adopt a forced Listen Before Transmit (LBT) technology for the use of an unlicensed frequency band, that is, data transmission can be performed only when the current channel is sensed to be unoccupied. A problem with this mechanism is that some data cannot be guaranteed to be sent at a certain location.
In the unlicensed frequency band, according to the design of the current new air interface, if the terminal needs to transmit uplink data, it needs to schedule according to the base station. The terminal needs to send a data request to the base station first, and then the base station performs corresponding resource scheduling to the terminal according to the network condition and the terminal requirement. And the terminal performs uplink data transmission according to the scheduling information of the base station by combining the channel and the self condition. In this process, the base station and the terminal need to adopt a plurality of communication processes. Due to the existence of LBT, each communication process is full of uncertainty, so that the whole uplink data transmission performance is seriously affected. In order to enhance the uplink transmission performance, it is necessary to consider shortening the entire communication flow and performing stronger protection on uplink data, for example, allocating fixed channel resources for uplink to perform data transmission. In this way, a plurality of HARQ processes can be allocated to the terminal at one time, but the downlink control information in the current 5G NR scheme only indicates whether one HARQ process is new data. There is no solution on how the network device feeds back when multiple HARQ processes are uplink.
Disclosure of Invention
The embodiment of the application provides a method and equipment for feeding back uplink data HARQ, and provides a scheme for realizing ACK/NACK information feedback of uplink data transmission of a base station for a terminal in order to solve ACK/NACK feedback of a plurality of uplink HARQ processes.
The application provides a method for feeding back uplink data HARQ, which is used for a mobile communication system and comprises the following steps:
the downlink control channel comprises second information and/or third information;
the second information comprises ACK/NACK feedback information of uplink data channels from X terminal devices, wherein X is a positive integer;
the third information includes a parameter for controlling the uplink data channel.
Preferably, the second information includes a transmission block of an uplink data channel and/or ACK/NACK information of a coded block.
Preferably, the second information includes fourth information, and the fourth information includes the identifiers of the X terminal devices.
Preferably, the third information comprises at least one of the following parameters: modulation coding information, time domain information, frequency domain information and uplink power control information of an uplink data channel of the nth terminal equipment, wherein n is more than 1 and less than or equal to X.
Further, the second information comprises X fields, which are respectively used for X terminal devices; the third information contains X fields, which are respectively used for X terminal devices.
In any embodiment of the present application, preferably, the third information is configured by a higher layer signaling.
The embodiment of the present application further provides a network device for feeding back HARQ for uplink data, where the network device is configured to:
receiving uplink data channels from X terminal devices;
sending a downlink control channel, wherein the downlink control channel comprises second information and/or third information;
the second information comprises ACK/NACK feedback information of uplink data channels from X terminal devices, wherein X is a positive integer;
the third information includes a parameter for controlling the uplink data channel.
Preferably, in the network device, the second information includes a transmission block of an uplink data channel and/or ACK/NACK information of coded blocks.
Preferably, in the network device, the second information includes fourth information, and the fourth information includes the identifiers of the X terminal devices.
Preferably, in the network device, the third information includes at least one of the following parameters: modulation coding information, time domain information, frequency domain information and uplink power control information of an uplink data channel of the nth terminal equipment, wherein n is more than 1 and less than or equal to X.
Preferably, in the network device, the second information includes X fields, which are respectively used for X terminal devices; the third information contains X fields, which are respectively used for X terminal devices.
In the network device according to any of the embodiments of the present application, preferably, the third information is configured by a higher layer signaling.
The present application further provides a terminal device, configured to implement the method according to any of the embodiments of the present application, where the terminal device is configured to: and receiving the downlink control channel, and identifying the second information and/or the third information. And the terminal equipment is also used for obtaining ACK/NACK feedback information of an uplink data channel of the nth terminal equipment from the second information, wherein X is more than 1 and less than or equal to n and is a positive integer. And the terminal equipment is also used for obtaining the parameters for controlling the uplink data channel from the third information and controlling the uplink data channel according to the parameters in the third information.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
the downlink control message provided by the invention can realize that the base station carries out ACK/NACK feedback of a plurality of HARQ processes on uplink data which is already sent by a plurality of terminals, and can also carry out information adjustment of future uplink sending on the terminals according to the condition of a channel. Therefore, the problem of low operation efficiency in the unauthorized frequency band caused by the fact that the downlink of the 5G system does not send the ACK/NACK instruction to the uplink data of the terminal can be solved, and the robustness of the 5G system in the use of the unauthorized frequency band is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a flow chart of an embodiment of the method of the present invention for a network device;
FIG. 2 is a flowchart of an embodiment of the method of the present invention applied to a terminal device;
FIG. 3 is a schematic diagram of a first message indicating only single terminal second and third messages;
FIG. 4 is a diagram illustrating a first message indicating only a single terminal second message;
fig. 5 is a schematic diagram of the first information indicating only the third information of a single terminal;
fig. 6 is a schematic diagram illustrating indication of second information of multiple terminals in first information;
fig. 7 is a schematic diagram illustrating indication of third information of multiple terminals in the first information;
FIG. 8 is a diagram illustrating indication of third information of multiple terminals in the first information
Fig. 9 is a schematic diagram of a network device and a terminal device according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a flowchart of an embodiment of the method of the present invention applied to a network device.
The embodiment of the application provides a method for feeding back uplink data HARQ, which is used for a mobile communication system and comprises the following steps:
The number of the terminal devices is X, and X is a positive integer.
In step 102, the downlink control channel includes second information and/or third information;
the second information comprises ACK/NACK feedback information of uplink data channels from X terminal devices, wherein X is a positive integer; the third information includes a parameter for controlling the uplink data channel.
Here, downlink control information (first information) is defined, which includes feedback information (second information) related to an uplink data channel (PUSCH) before a first information transmission time, and parameter information (third information) related to uplink transmission after the first information transmission time.
Preferably, the second information includes a transmission block of an uplink data channel and/or ACK/NACK information of a coded block. Preferably, the second information may include data block information of one or more terminal PUSCHs, ACK/NACK feedback information of coded block information, and the like.
Preferably, the second information includes fourth information, and the fourth information includes the identifiers of the X terminal devices. This is because, when the second information includes feedback information to be transmitted to a plurality of terminals, the second information needs to indicate which terminals (identified by the fourth information) to include in the current information for feedback.
Preferably, the third information comprises at least one of the following parameters: modulation coding information, time domain information, frequency domain information and uplink power control information of an uplink data channel of the nth terminal equipment, wherein n is more than 1 and less than or equal to X. That is, the third information may include one or more terminal uplink transmission related modulation and coding information, time domain information, frequency domain information, uplink power control information, and the like
Further, the second information comprises X fields, which are respectively used for X terminal devices; the third information contains X fields, which are respectively used for X terminal devices.
It should be noted that the first information may only include the second information, or the third information. When the first information includes both the second and third information, the second information and the third information indicate the same terminal. For example, if the second and third information each contain only information indicating 1 terminal, the second and third information indicate the same terminal. If the second and third information only contain information indicating 1 terminal, the first information does not display indication indicating terminal, that is, the first information does not set special information bit to indicate the terminal indicated by the first information. If the second and third information comprise information indicating a plurality of terminals, and the terminals indicated by the second and third information are the same (e.g. 10 terminals are served by the base station, and the second information indicates the terminals 1, 3, 5, then the third information also indicates the corresponding information of the terminals 1, 3, 5), this has the advantage that the third information does not indicate the indication terminal by itself, i.e. the third information does not include bits indicating the terminals.
In any embodiment of the present application, preferably, the third information is configured by a higher layer signaling. I.e. the third information content contained in the first information may be changed according to a high level configuration.
It should be noted that the first information is carried by the PDCCH and is one of DCI messages. The downlink control information in the scheme of the current technical standard only realizes the indication of 1 HARQ process of one terminal device, and the indication content is NDI (new information indication), not the ACK/NACK information indication is directly performed.
Fig. 2 is a flowchart of an embodiment of the method of the present invention applied to a terminal device.
for convenience of explanation, the terminal device that sends the uplink data channel is set as the nth terminal device of the X terminal devices.
the terminal receives the PDCCH containing downlink control information (first information) sent by the network device, where the downlink control information (first information) includes one or more of second information, third information, and fourth information, and these information are defined in step 102.
Step 203, obtaining ACK/NACK feedback information of an uplink data channel of the nth terminal device from the second information, where X is a positive integer greater than 1 and less than or equal to n;
step 204, preparing PUSCH and other related uplink channel information according to the first information in the PDCCH.
For example, if the feedback information is NACK, the uplink data channel is retransmitted;
for another example, a parameter for controlling the uplink data channel is obtained from the third information, and the uplink data channel is controlled according to the parameter in the third information.
Fig. 3 is a schematic diagram of the first information indicating only the second and third information of a single terminal.
For example, when the second and third information indications are performed for a single terminal, the first information is designed as shown in fig. 3. And the second information occupies A bits to send ACK/NACK information, and the third information occupies M bits to carry out uplink sending information after the first information sending time. Where M is the total length of the third information, and is the sum of lengths of modulation and coding information, time domain information, frequency domain information, uplink power control information, and the like sent in uplink, for example, M is B + C + D + E.
Fig. 4 is a schematic diagram of indicating only the second information of a single terminal in the first information.
For example, the single terminal is indicated by the second information, in this case, the first information is designed as shown in fig. 4, the second information occupies a bits to send information such as ACK/NACK, and does not include the third information.
Fig. 5 is a schematic diagram illustrating that only the third information of a single terminal is indicated in the first information.
For example, a single terminal is instructed by the third information, in which case the first information is designed as shown in fig. 5, and the third information occupies M bits to transmit uplink transmission information after the first information transmission time. Where M is the total length of the third information, and is the sum of lengths of modulation and coding information, time domain information, frequency domain information, uplink power control information, and the like sent in uplink, for example, M is B + C + D + E.
Fig. 6 is a schematic diagram illustrating the indication of the second information of the multiple terminals in the first information.
For example, the second information is indicated to the plurality of terminals, in this case, the first information is designed as shown in fig. 6, and the second information includes ACK/NACK indications to the plurality of terminals and the fourth information. The fourth information indicates a terminal indicated by the second information among the F terminals that receive the first information (of the F terminals, the fourth information is not required for all terminals).
Fig. 7 is a schematic diagram illustrating the first information indicating the third information of the multiple terminals.
For example, the third information is indicated to the multiple terminals, in this case, the first information is designed as shown in fig. 7, and the third information occupies N bits to transmit the uplink transmission information after the first information transmission time. Where N is the total length of the third information, and is the total length of the modulation and coding information, the time domain information, the frequency domain information, the uplink power control information, and the like sent by the multiple terminals in the uplink, for example, N ═ H + I + J + K. The information of H, I, J, K, etc. includes information of all F terminals receiving the first information.
Fig. 8 is a schematic diagram illustrating the first information indicating the third information of the multiple terminals.
For example, the second information and the third information are indicated to the plurality of terminals, in this case, the first information is designed as shown in fig. 8, and the second information includes ACK/NACK indications to the plurality of terminals and the fourth information. The fourth information indicates a terminal indicated by the second information among the F terminals that receive the first information. And the third information occupies N bits to send the uplink sending information after the first information sending time. Where N is the total length of the third information, and is the total length of the modulation and coding information, the time domain information, the frequency domain information, the uplink power control information, and the like sent by the multiple terminals in the uplink, for example, N ═ H + I + J + K. The information such as H \ I \ J \ K and the like comprises the information of all F terminals receiving the first information.
It should be noted that, in the embodiments of fig. 3 to 8, the first information may further include some other information, such as padding bits, which is not within the scope of the present invention and is not limited herein.
Fig. 9 is a schematic diagram of a network device and a terminal device according to the present invention.
Consider a communication system comprised of network devices and terminal devices. One network device can simultaneously transmit and receive data to a plurality of terminal devices. The network device includes a network data unit and a network control unit. The terminal device includes a terminal data unit and a terminal control unit. The network data unit and the terminal data unit transmit data through a downlink data shared channel (PDSCH) and an uplink data shared channel (PUSCH). And the network control unit and the terminal control unit exchange control information through a downlink control channel (PDCCH) and an uplink control channel (PUCCH). The PDCCH transmits Downlink Control Information (DCI) and performs specific transmission format-related contents of the PDSCH, the PUSCH, and the PUCCH. And after the network data unit finishes receiving the data, the network control unit feeds back ACK/NACK information whether the data is correctly received to the terminal equipment according to the data receiving condition. Specifically, information such as ACK/NACK is carried by a PDCCH (downlink control channel). The invention provides a design of DCI, which is specifically used for carrying out ACK/NACK feedback on uplink PUSCH transmission.
The embodiment of the present application further provides a network device 20 for feeding back HARQ for uplink data, which includes a network data unit 21 and a network control unit 22.
The network data unit is used for receiving uplink data channels from X terminal devices;
the network control unit is used for sending a downlink control channel, and the downlink control channel comprises second information and/or third information;
the second information comprises ACK/NACK feedback information of uplink data channels from X terminal devices, wherein X is a positive integer;
the third information includes a parameter for controlling the uplink data channel.
Preferably, in the network device, the second information includes a transmission block of an uplink data channel and/or ACK/NACK information of coded blocks.
Preferably, in the network device, the second information includes fourth information, and the fourth information includes the identifiers of the X terminal devices.
Preferably, in the network device, the third information includes at least one of the following parameters: modulation coding information, time domain information, frequency domain information and uplink power control information of an uplink data channel of the nth terminal equipment, wherein n is more than 1 and less than or equal to X.
Preferably, in the network device, the second information includes X fields, which are respectively used for X terminal devices; the third information contains X fields, which are respectively used for X terminal devices.
In the network device according to any of the embodiments of the present application, preferably, the third information is configured by a higher layer signaling.
The present application further proposes a terminal device 10, which includes a terminal data unit 11 and a terminal control unit 12, where the terminal control unit is configured to receive the downlink control channel and identify the second information and/or the third information. And the terminal equipment is also used for obtaining ACK/NACK feedback information of an uplink data channel of the nth terminal equipment from the second information, wherein X is more than 1 and less than or equal to n and is a positive integer. And the terminal equipment is also used for obtaining the parameters for controlling the uplink data channel from the third information and controlling the uplink data channel according to the parameters in the third information. And the terminal data unit is used for sending the uplink data channel.
In view of the above, the present application proposes a new format of downlink control information, which is shown in DCI format0_2 in table 1, and other formats are shown in standard 38.212 table 7.3.1-1.
TABLE 1 DCI Format
The specific definition of the DCI Format0_2 is, for example:
format0_ 2: DCI format0_2 is used to identify HARQ information of PUSCH.
Wherein the indication to the single terminal can transmit the following DCI format0_2 information in the following manner, for example, in a CRC manner scrambled by C-RNTI or CS-RNTI:
second information comprising
ACK/NACK indication-A bit
Third information comprising:
modulation coding scheme-0 or B bits
PUSCH-scheduled TPC Command-0 or C bits
Time domain resource allocation-0 or D bits
Frequency domain resource allocation-0 or E bits
The indication to the multi-terminal can be realized by defining the UE-GROUP-RNTI and transmitting the following DCI format0_2 information in a CRC mode scrambled by the UE-GROUP-RNTI:
the second information includes:
terminal identity-F bit
ACK/NACK indication-G bit
The third information includes:
modulation coding scheme-0 or H bits
PUSCH-scheduled TPC Command-0 or I bits
Time domain resource allocation-0 or J bits
Frequency domain resource allocation-0 or K bits
A, B, C, D, E, F, G, H, I, J and K are positive integers and can be preset by a protocol or configured by a high-level specification. When the DCI format0_2 is scrambled by the C-RNTI, only one terminal is served, and terminal indication is not required. When the DCI format0_2 is scrambled by the UE-GROUP-RNTI, a plurality of terminals are served, and the ACK/NACK information of which terminals is contained in the second information needs to be indicated, so that the terminal indication of the F bits needs to be performed, and the length of the F is the same as the number of terminals scrambled by the UE-GROUP-RNTI. The indication information in the third type of information may be configured by a higher layer, and if the indication is made, the indication is made to all terminals scrambled by using the UE-GROUP-RNTI.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (11)
1. A HARQ feedback method for uplink data is used for an unlicensed frequency band of a mobile communication system,
the first information in the downlink control channel comprises second information and third information;
the second information comprises ACK/NACK feedback information of uplink data channels from X terminal devices, wherein X is a positive integer; the second information comprises fourth information, and the fourth information indicates a terminal indicated by the second information in F terminals receiving the first information;
the third information comprises at least one of the following parameters: modulation coding information, time domain information, frequency domain information and uplink power control information of an uplink data channel of the nth terminal equipment, wherein n is more than 1 and less than or equal to X;
the second information and the third information indicate the same terminal.
2. The method of claim 1,
the second information comprises the transmission block of the uplink data channel and/or the ACK/NACK information of the coding blocks.
3. The method of claim 1,
the second information comprises fourth information, and the fourth information comprises the identifiers of the X pieces of terminal equipment.
4. The method of claim 3,
the second information comprises X fields which are respectively used for X terminal devices;
the third information contains X fields, which are respectively used for X terminal devices.
5. The method according to any one of claims 1 to 4,
the third information is configured by high layer signaling.
6. A network device for HARQ feedback of uplink data, which is used for an unlicensed frequency band of a mobile communication system,
receiving uplink data channels from X terminal devices;
sending a downlink control channel, wherein first information in the downlink control channel comprises second information and third information;
the second information comprises ACK/NACK feedback information of uplink data channels from X terminal devices, wherein X is a positive integer; the second information comprises fourth information, and the fourth information indicates a terminal indicated by the second information in F terminals receiving the first information;
the third information comprises at least one of the following parameters: modulation coding information, time domain information, frequency domain information and uplink power control information of an uplink data channel of the nth terminal equipment, wherein n is more than 1 and less than or equal to X;
the second information and the third information indicate the same terminal.
7. The network device of claim 6,
the second information comprises the transmission block of the uplink data channel and/or the ACK/NACK information of the coding blocks.
8. The network device of claim 6,
the second information comprises fourth information, and the fourth information comprises the identifiers of the X pieces of terminal equipment.
9. The network device of claim 8,
the second information comprises X fields which are respectively used for X terminal devices;
the third information contains X fields, which are respectively used for X terminal devices.
10. The network device according to any of claims 6 to 9,
the third information is configured by high layer signaling.
11. A terminal device for use in an unlicensed frequency band in a mobile communication system,
the first information in the downlink control channel comprises second information and third information;
receiving the downlink control channel, and identifying the second information and the third information;
acquiring ACK/NACK feedback information of an uplink data channel of nth terminal equipment from the second information, wherein X is more than 1 and less than or equal to n and is a positive integer; the second information comprises fourth information, and the fourth information indicates a terminal indicated by the second information in F terminals receiving the first information;
the second information and the third information indicate the same terminal;
obtaining at least one of the following parameters from the third information: modulation coding information, time domain information, frequency domain information and uplink power control information of an uplink data channel of the nth terminal equipment, wherein n is more than 1 and less than or equal to X;
and controlling the uplink data channel according to the parameter in the third information.
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