CN110876204B - Mobile communication system, network equipment, terminal equipment and data scheduling method - Google Patents

Mobile communication system, network equipment, terminal equipment and data scheduling method Download PDF

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CN110876204B
CN110876204B CN201811012823.0A CN201811012823A CN110876204B CN 110876204 B CN110876204 B CN 110876204B CN 201811012823 A CN201811012823 A CN 201811012823A CN 110876204 B CN110876204 B CN 110876204B
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pdcch
harq
index
dai
pdcchs
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CN110876204A (en
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闫志宇
杜滢
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China Academy of Information and Communications Technology CAICT
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China Academy of Information and Communications Technology CAICT
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • 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
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA

Abstract

The application discloses a mobile communication system, network equipment, terminal equipment and a data scheduling method, wherein the method comprises the following steps: searching a PDCCH set, wherein the PDCCH set comprises at least 2 repeated PDCCHs and is used for scheduling 1 target PDSCH set; determining the value of the DAI field of each PDCCH in the PDCCH set according to the position sequence of the DAI field in the PDCCH set; the position ordering is based on the identity of the transmission resources occupied by each PDCCH in the PDCCH set: at least one numerical value of the monitoring time, the service cell index, the bandwidth part index, the CORESET index, the search space index and the CCE index is arranged from small to large. Determining the bit number of an HARQ-ACK codebook and each HARQ-ACK message according to the searched DAI field of the PDCCH; and transmitting the HARQ-ACK codebook. The application also comprises a mobile communication network device, a terminal device and a system applying the method. The dynamic HARQ-ACK codebook determined by the sequencing mode of the DAI in the downlink control channel meets the time delay requirement and the efficiency requirement of the uplink control information transmission in the NR system.

Description

Mobile communication system, network equipment, terminal equipment and data scheduling method
Technical Field
The present application relates to the field of mobile communications technologies, and in particular, to a data scheduling method, and a mobile communication device and a system applying the data scheduling method.
Background
In the NR technique, a network device schedules a Physical Downlink Control Channel (PDSCH) for transmitting Downlink information and a Physical Uplink Shared Channel (PUSCH) for a terminal device (UE) to transmit uplink information through a Physical Downlink Control Channel (PDCCH). The terminal equipment sends Acknowledgement (ACK) or non-acknowledgement (NACK) information of downlink traffic data reception to the network equipment so that the network equipment determines whether to reschedule the downlink traffic data or to schedule channel downlink traffic data to the terminal equipment. The ACK and NACK information are collectively referred to as hybrid automatic repeat request acknowledgement information (HARQ-ACK).
When the network equipment sends PDCCH to the terminal equipment only in a part of downlink channels in the HARQ feedback window, the terminal equipment only feeds back the corresponding HARQ-ACK information aiming at the downlink channels receiving the PDCCH by using the determination mode of the HARQ-ACK dynamic codebook. In an actual system, a terminal device may lose some Downlink Control Information (DCI), and a Downlink Assignment Index (DAI) field in a PDCCH can be used to determine the lost PDCCH, and feed back NACK information at a position corresponding to the lost PDCCH. Section 9.1 of 3gpp TS38.213vf20 provides a technical solution for determining the number of bits and content of the HARQ-ACK codebook according to the DAI.
In order to meet the reliability requirement of URLLC service, the PDCCH is repeatedly sent for multiple times corresponding to the same PDSCH set containing 1 PDSCH or a plurality of repeated PDSCHs, so that the reliability of the control channel is improved. However, the multiple PDCCHs have different transmission time resources, different transmission frequency resources, or different transmission time and frequency resources. Information redundancy is caused when the PDCCH is repeatedly transmitted, and the HARQ-ACK response efficiency between the terminal equipment and the network equipment is reduced. There is no prior art for how to determine the ordering rules of the count DAI (Counter DAI) and the Total DAI (Total DAI) in the repeatedly transmitted PDCCH, and the position arrangement of the HARQ-ACK information of the PDSCH corresponding to the repeatedly transmitted PDCCH in the HARQ-ACK codebook information.
Disclosure of Invention
The application provides a mobile communication system, network equipment, terminal equipment and a data scheduling method, and aims to solve the problem of how to perform high-efficiency hybrid automatic repeat request response between the network equipment and the terminal equipment when a plurality of PDCCHs correspond to the same PDSCH set.
The application provides a data scheduling method of a mobile communication system, which is used for a mobile terminal of the mobile communication system and comprises the following steps:
searching a PDCCH set, wherein the PDCCH set comprises at least 2 repeated PDCCHs; the repeated PDCCH is used for scheduling 1 target PDSCH set and comprises 1 PDSCH or at least 2 repeated PDSCHs;
determining the bit number of an HARQ-ACK codebook and each HARQ-ACK message according to the searched DAI field of the PDCCH;
and transmitting the HARQ-ACK codebook.
The application also provides a data scheduling method of the mobile communication system, which is used for the network equipment of the mobile communication system and comprises the following steps:
transmitting a PDCCH set comprising at least 2 repeated PDCCHs; the repeated PDCCH is used for scheduling 1 set of target PDSCHs, including 1 PDSCH or at least 2 repeated PDSCHs.
In any 1 embodiment of the present invention, a value of a DAI field of each PDCCH in the PDCCH set is determined according to a position order of each PDCCH in the PDCCH set; the position ordering method is that at least one value of the identification monitoring time, the service cell index, the bandwidth part index, the CORESET index, the search space index and the CCE index of the transmission resource occupied by each PDCCH in the PDCCH set is arranged from small to large.
Preferably, the DAI field contains a count DAI; and the value of the counting DAI of each PDCCH in the PDCCH set represents the position-ordered sequence number of each PDCCH in the PDCCH set.
Preferably, the DAI field contains a total amount DAI; and the value of the total DAI of each PDCCH in the PDCCH set represents the total number of PDCCHs scheduled in the HARQ window by the PDCCH set at the monitoring time of each PDCCH.
Preferably, the method of position ordering further comprises: and when the monitoring time of any 2 PDCCHs in the PDCCH set is the same, arranging the numerical values of the CORESET indexes or the bandwidth part indexes of the any 2 PDCCHs from small to large.
Preferably, the method of position ordering further comprises: and when the monitoring time, the serving cell index and the CORESET index of any 2 PDCCHs in the PDCCH set are the same, arranging the numerical values of the search space indexes of any 2 PDCCHs from small to large.
Preferably, the method of position ordering further comprises: and when the monitoring time, the serving cell index, the CORESET index and the search space index of any 2 PDCCHs in the PDCCH set are the same, arranging the numerical values of the first CCE indexes of the any 2 PDCCHs from small to large.
The application also provides a mobile communication system terminal device, which is used for the method of the embodiment of the application, and the terminal device comprises a terminal processing module; the terminal processing module is used for: searching the PDCCH set; determining a HARQ-ACK codebook according to the searched DAI field of the PDCCH; and transmitting the HARQ-ACK codebook.
The application also provides a mobile communication system network device, which is used for generating and sending the PDCCH set and receiving the HARQ-ACK codebook.
The application also provides a mobile communication system, which comprises the terminal device and the network device in any embodiment of the application.
The above-mentioned at least 1 technical scheme that this application embodiment adopted can reach following beneficial effect:
the transmission method of the uplink control information solves the problem of how to determine the size of the HARQ-ACK codebook and the sequencing of the corresponding HARQ-ACK information in the HARQ-ACK codebook when the PDCCH is sent for multiple times to correspond to the same (group) PDSCH under the condition of improving the transmission performance by retransmitting the PDCCH. By adopting the scheme of the invention, the HARQ-ACK feedback efficiency can be improved, and the performance requirement of the PDCCH can be met.
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 an example of count DAI and total DAI values in DCI in a carrier aggregation scenario in the prior art;
FIG. 2 is a diagram illustrating HARQ-ACK information according to the prior art;
FIG. 3 is a flow chart of an embodiment of the method of the present invention for a network device;
FIG. 4 is a flowchart of an embodiment of the method of the present invention applied to a terminal device;
FIG. 5 is a diagram of multiple repeated PDCCHs corresponding to 1 PDSCH set, wherein
Fig. 5 (a) a plurality of repeated PDCCHs respectively schedule a plurality of repeated PDSCHs;
fig. 5 (b) multiple duplicate PDCCHs uniformly schedule multiple duplicate PDSCHs;
fig. 5 (c) multiple duplicate PDCCHs schedule 1 PDSCH;
FIG. 6 is a schematic diagram of a system embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be clearly and completely described below with reference to 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.
In the NR rel.15 standard, a network device schedules a PDSCH for transmitting downlink information through a PDCCH. Described according to 3GPP TS 38.211.vf20, 3GPP TS 38.213.vf20: a Control-resource set (CORESET for short) is defined in the NR system. CORESET frequency by frequency
Figure GDA0003969883540000041
Number of resource blocks, on time domain->
Figure GDA0003969883540000042
And each symbol is composed. In each downlink Bandwidth part (BWP for short) in the serving cell, the network device may configure up to 3 CORESET for the UE through high-level signaling. In addition, for each BWP within the serving cell, the network device configures a search space set (SSS for short) for the terminal device. Each SSS corresponds to a certain CORESET configured for the terminal device. Each SSS configuration further comprises that the monitoring period of the PDCCH is k p,s Offset of one time slot and PDCCH monitoring is o p,s One slot, and a time pattern in which the PDCCH is monitored within 1 slot. The terminal equipment determines the PDCCH monitoring time (PDCCH monitoring occasion) corresponding to the SSS and the monitoring PDCCH candidates (PDCCH candidates) corresponding to the SSS according to the configuration parameters of the SSS。
And the terminal equipment sends Acknowledgement (ACK) or non-acknowledgement (NACK) information corresponding to the PDSCH to the network equipment so that the network equipment determines whether to reschedule the downlink service data or to schedule new downlink service data to the terminal equipment. The ACK and NACK information are collectively referred to as hybrid automatic repeat request acknowledgement information (HARQ-ACK). The terminal device may feed back HARQ-ACK information only for PDSCH received within a "HARQ feedback window" corresponding to slot n in an uplink slot (slot) n.
In the scheme of the invention, in order to meet the reliability requirement of URLLC service and improve the reliability of the control channel, PDCCH repeated transmission is an effective way for improving the reliability of the control channel. For example, 2 PDCCH repetitions, corresponding to 1 PDSCH transmission.
For example, the PDCCH is repeatedly transmitted on the transmission resource identified by the cell index "3" for scheduling the PDSCH transmitted by the cell to support the URLLC service. By repeatedly sending the PDCCH, the terminal equipment can utilize the diversity of the PDCCH transmission channels for many times, improve the transmission reliability of the PDCCH, and further ensure that the UE receives the PDSCH with a minimum error rate.
In the scheme of the invention, when the same PDSCH transmission is scheduled through the repeated PDCCH for K times, the transmission time resources, the transmission frequency resources or both the transmission time and the frequency resources of the repeated PDCCH for K times are different. There is no prior art scheme for how to determine the DAI field in the K repeated PDCCHs and how to determine the positions of the HARQ-ACK information of the PDSCH corresponding to the K repeated PDCCHs in the HARQ-ACK codebook information.
The value of DAI in the K repeated PDCCHs is determined according to the position sequence of each PDCCH in the PDCCH set; and the UE determines the codebook size of the fed-back HARQ-ACK according to the received DAI field of the at least 1-time repeated PDCCH and determines the ordering of the feedback information of the indicated HARQ-ACK of the PDSCH in the HARQ-ACK codebook. Here, the location of the duplicate PDCCH refers to a location of a transmission resource of the duplicate PDCCH, and specifically, is a location identified by at least 1 item of a serving cell index, a monitoring time, a CORESET index, a bandwidth part index, a search space index, and a CCE index (preferably, a first CCE index in the duplicate PDCCH).
In the scheme of the present invention, preferably, when the PDCCH that is repeatedly transmitted indicates the same PDSCH, under the condition that the PDSCH is correctly received, information corresponding to the PDCCH that is successfully searched in the HARQ-ACK codebook is ACK, and information corresponding to the PDCCH that is incorrectly received in the HARQ-ACK codebook is NACK.
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 an example of count DAI and total DAI values in DCI in a carrier aggregation scenario in the prior art. If a plurality of PDCCHs constitute 1 PDCCH set, each PDCCH includes a DAI field.
The DAI field contains a "count DAI"; and the value of the counting DAI of each PDCCH in the PDCCH set represents the sequence number of each PDCCH in the PDCCH set.
The DAI field also contains a "total DAI"; and the value of the total DAI of each PDCCH in the PDCCH set represents the total number of PDCCHs scheduled in the HARQ window by the PDCCH set at the monitoring time of each PDCCH.
And the PDCCH set is sent in 1 HARQ feedback window, and HARQ-ACK of PDSCH scheduled by each PDCCH in 1 HARQ feedback window is fed back in the same uplink channel.
It should be noted that: the 'counting DAI' is used for informing the terminal equipment of the position occupied by the current PDCCH in the PDCCH set; the "total DAI" is used to tell the terminal device the number of PDCCHs scheduled in the PDCCH set at the current moment of expiration. This may help the terminal device to identify whether some PDCCHs are lost, and may also help the terminal device to determine how many bits of HARQ-ACK information need to be fed back, so as to unify the codebook sizes of HARQ-ACK feedback determined by the terminal device and the network device. The transmission of the PDCCH corresponding to the PDSCH transmitted by the network device is not 100% reliable, and some PDCCHs may be lost by the terminal device. Therefore, the sizes of the codebooks for HARQ-ACK feedback determined by the terminal equipment and the network equipment are different, and finally the error rate of the HARQ-ACK is high. Applying the DAI field can help reduce or avoid this.
In 1 embodiment of the mobile communication system, the DAI field in format 1 (denoted as DCI format 1 \0) of the PDCCH includes a 2-bit count DAI. Format 2 of PDCCH (denoted as DCI format 1_1), where the DAI field includes a 2-bit count DAI when the terminal device is configured with 1 cell service; the DAI field includes a count DAI of 2 bits and a total DAI of 2 bits in the case where the terminal device is configured with more than 1 cell service. Specifically, the counting order of the counting DAI in the DCI format 1 _0and DCI format 1 _1is the sequence number obtained by first indexing the serving cell and then sequencing the monitoring time indexes from low to high according to the position of the current PDCCH in the { serving cell, monitoring time } space. The total DAI value in the PDCCH format 1 \, 1 is updated according to the granularity of each monitoring time, and the value is the number of PDCCHs transmitted at the current monitoring time. In fig. 1, carrier aggregation is performed in 3 cells (cells), and the count DAI and the total DAI each include 2 bits, for example, "4" in "4/5" indicates the count DAI and "5" indicates the total DAI.
Fig. 2 is a diagram illustrating HARQ-ACK information in the prior art. In the embodiment of the present application, the value of the count DAI in DCI format 1 _0and DCI format 1 _1is related to { serving cell, monitoring time } where the DCI is located, and each 1 DCI corresponds to 1-time PDSCH scheduling. According to the value of the counting DAI in the DCI format 1_0/DCI format 1_1, the terminal equipment can determine that the HARQ-ACK of the corresponding PDSCH is O ACK Bit HARQ-ACK information
Figure GDA0003969883540000071
In the specific location of (a). Taking the PDCCH set in fig. 1 as an example, if the terminal device does not receive the high-level configuration signaling "PUCCH HARQ-ACK spatial bundling" and receives the high-level configuration signaling "DCI schedules the maximum number of codewords", then O ACK =20, HARQ-ACK information fed back by the terminal device in Slot n is ≥ h>
Figure GDA0003969883540000072
If the terminal equipment receives the high-layer configuration signaling PUCCH HARQ-ACK space bundling, and/or does not receive the high-layer configuration signaling PUCCH HARQ-ACK space bundlingIf the high-level configuration signaling 'DCI scheduling maximum code word number' is received, O ACK =10, each bit of HARQ-ACK information fed back by the terminal device in Slot n corresponds to a demodulation result of the PDSCH corresponding to 1 PDCCH.
Fig. 3 is a flowchart of an embodiment of the method of the present invention applied to a network device. The embodiment of the method used for the network equipment specifically comprises the following steps:
step 100, sending a PDCCH set, wherein the PDCCH set comprises at least 2 repeated PDCCHs; the repeated PDCCH is used for scheduling 1 target PDSCH set, and the target PDSCH set comprises 1 PDSCH or at least 2 repeated PDSCHs.
In step 100, a value of a DAI field of each PDCCH in the PDCCH set is determined according to a position sequence of each PDCCH in the PDCCH set.
The position ordering method is that at least 1 item of value in the identification (the identification comprises monitoring time, service cell index, bandwidth part index, CORESET index, search space index and CCE index) of the transmission resource occupied by each PDCCH in the PDCCH set is arranged from small to large. Preferably, the values of at least one of the bandwidth part index, the CORESET index, the search space index, and the CCE index are arranged from small to large according to the monitoring time and the serving cell index in the identifier of the transmission resource occupied by each PDCCH in the PDCCH set.
The location of each PDCCH refers to a location of a transmission resource occupied by the PDCCH, and specifically, refers to a location identified by at least one of a monitoring time, a serving cell index, a CORESET index, a bandwidth part index, a search space index, and a CCE index. For example, in a transmission resource space formed by { serving cell, monitoring time }, the ordering manner of 1 PDCCH may be, for example, the ordering of the PDCCH corresponding to the monitoring time earlier; and when the monitoring time corresponding to the 2 PDCCHs is the same, the PDCCHs with small corresponding service cell index values are sequenced first. When the monitoring time corresponding to the 2 PDCCHs is the same and the index value of the serving cell is also the same, the PDCCHs with small corresponding bandwidth part index are ordered first. When the monitoring time corresponding to 2 PDCCHs is the same, the serving cell index value is the same, and the bandwidth part index is also the same, the PDCCH with the smaller CORESET index is ordered first. When the monitoring time corresponding to 2 PDCCHs is the same, the serving cell index value is the same, the bandwidth part index is the same, and the CORESET index is also the same, the PDCCHs with a small search space index are ordered first. When the monitoring time corresponding to 2 PDCCHs is the same, the index value of the service cell is the same, the index of the bandwidth part is the same, the index of the CORESET is the same, and the index of the search space is also the same, the PDCCH with the small index of the first CCE is ordered first.
Preferably, the method of position ordering further comprises: and when the monitoring time of any 2 PDCCHs in the PDCCH set is the same, arranging the numerical values of the CORESET indexes or the bandwidth part indexes of the any 2 PDCCHs from small to large.
For example, the PDCCH set includes a 1 st PDCCH and a 2 nd PDCCH, the monitoring time corresponding to the 1 st PDCCH and the 2 nd PDCCH is the same, the CORESET index corresponding to the 1 st PDCCH is CORESET # a, the CORESET index corresponding to the 2 nd PDCCH is CORESET # b, where a < b, and a value indicated by a count DAI of the 1 st PDCCH is smaller than a value indicated by a count DAI of the 2 nd PDCCH.
For another example, the PDCCH set includes a 1 st PDCCH and a 2 nd PDCCH, the monitoring times corresponding to the 1 st PDCCH and the 2 nd PDCCH are the same, the bandwidth part index corresponding to the 1 st PDCCH is # a, the bandwidth part index corresponding to the 2 nd PDCCH is # b, where a < b, and a value indicated by a count DAI of the 1 st PDCCH is smaller than a value indicated by a count DAI of the 2 nd PDCCH.
Preferably, the method of position ordering further comprises: and when the monitoring time of any 2 PDCCHs in the PDCCH set is the same as the CORESET index, arranging the numerical values of the search space indexes of the any 2 PDCCHs from small to large.
For example, the PDCCH set includes a 1 st PDCCH and a 2 nd PDCCH, the monitoring times corresponding to the 1 st PDCCH and the 2 nd PDCCH are the same, and the CORESET index is the same, the SSS index corresponding to the 1 st PDCCH is CCE # a, and the SSS index corresponding to the 2 nd PDCCH is CCE # b, where a < b, and a value indicated by a count DAI of the 1 st PDCCH is smaller than a value indicated by a count DAI of the 2 nd PDCCH.
Preferably, the method of position ordering further comprises: and when the monitoring time, the serving cell index, the CORESET index and the search space index of any 2 PDCCHs in the PDCCH set are the same, arranging the numerical values of the first CCE indexes of the any 2 PDCCHs from small to large.
For example, the PDCCH set includes a 1 st PDCCH and a 2 nd PDCCH, the monitoring time instants corresponding to the 1 st PDCCH and the 2 nd PDCCH are the same, and the CORESET index and the SSS index are the same, the first CCE index corresponding to the 1 st PDCCH is CCE # a, and the first CCE index corresponding to the 2 nd PDCCH is CCE # b, where a < b, and a value indicated by a count DAI of the 1 st PDCCH is smaller than a value indicated by a count DAI of the 2 nd PDCCH.
Step 101, a network device receives a HARQ-ACK codebook from a terminal device.
It should be noted that, in step 101, the premise that the network device receives the HARQ-ACK codebook from the terminal device is that the terminal device completes PDCCH processing and sends out the HARQ-ACK codebook.
To achieve this, the terminal device first performs:
searching a PDCCH set comprising at least 2 repeated PDCCHs; the repeated PDCCH is used for scheduling 1 target PDSCH set and comprises 1 PDSCH or at least 2 repeated PDSCHs;
determining the bit number of an HARQ-ACK codebook and each HARQ-ACK message according to the searched DAI field of the PDCCH;
and transmitting the HARQ-ACK codebook.
Fig. 4 is a flowchart of an embodiment of the method of the present invention applied to a terminal device. The embodiment of the invention method special for the mobile communication system terminal equipment specifically comprises the following steps:
step 200, terminal equipment searches a PDCCH set, wherein the PDCCH set comprises at least 2 repeated PDCCHs; the repeated PDCCH is used for scheduling 1 target PDSCH set, and the target PDSCH set comprises 1 PDSCH or at least 2 repeated PDSCHs;
further, the PDCCH set also includes non-duplicate PDCCHs. The non-repeated PDCCH has no corresponding protection. Generally, the duplicate PDCCH and the non-duplicate PDCCH are used to schedule different PDSCHs, and the DAI field of each of the duplicate PDCCH and the non-duplicate PDCCH is different;
in step 200, the value of the DAI field of the duplicate PDCCH is determined by the network device according to the position sequence of the duplicate PDCCH in the PDCCH set;
for example, when a non-duplicate PDCCH is included in the PDCCH set, for example, the PDCCH set includes K duplicate PDCCHs. Then:
case a: and at the same monitoring time, the same SSS corresponds to the same CORESET.
The PDCCH repeatedly transmitted by the network device K times is located at the same monitoring time, the same serving cell index, and the same CORESET with different PDCCH candidates in the SSS, and the first Control Channel Element (CCE) indexes corresponding to the PDCCH candidates are different. The K times of repeatedly transmitted PDCCHs each include a different value of the count DAI, and the corresponding value of the count DAI is associated with the index of its first control channel element. For example, K =2, the 1 st PDCCH and the 2 nd PDCCH correspond to the same PDSCH scheduling. The first CCE index of the 1 st PDCCH is CCE # a, the first CCE index of the 2 nd PDCCH is CCE # b, and if a < b, the count DAI corresponding count N in the 1 st PDCCH is smaller than the count DAI corresponding count N' in the 2 nd PDCCH. The total DAI (if any) values in the 1 st repeated PDCCH and the 2 nd repeated PDCCH correspond to the number of PDCCHs transmitted by the current monitoring time.
Case B: and at the same monitoring time, different SSSs correspond to the same CORESET.
In this case, the PDCCHs repeatedly transmitted by the network device K times are located in PDCCH candidates in SSS that are the same monitoring time and different from one another in the same CORESET, and the indexes of the first CCEs corresponding to the PDCCH candidates may be the same or different. The K times of repeatedly transmitted PDCCHs each include different count DAI values, and the count DAI values corresponding to the respective PDCCHs are related to the index of the SSS in which the corresponding PDCCH is located. For example, K =2, the 1 st PDCCH and the 2 nd PDCCH correspond to the same PDSCH scheduling. An index of the 1 st PDCCH corresponding to the SSS is # a ', an index of the 2 nd PDCCH corresponding to the SSS is # b ', and if a ' < b ', a count DAI corresponding count value N in the 1 st PDCCH is less than a count DAI corresponding count value N ' in the 2 nd PDCCH. The total DAI (if any) values in the 1 st repeated PDCCH and the 2 nd repeated PDCCH correspond to the number of PDCCHs transmitted by the current monitoring time.
Case C: same monitoring time, different CORESET.
In this case, the PDCCHs repeatedly transmitted by the network device K times are located at the same monitoring time, and the indexes of the CORESET corresponding to the PDCCH candidates are different. The PDCCH transmitted repeatedly for K times respectively comprises different counting DAI values, and the corresponding counting DAI value is related to the index of the CORESET corresponding to the counting DAI value. For example, K =2, the 1 st PDCCH and the 2 nd PDCCH correspond to the same PDSCH scheduling. The 1 st PDCCH corresponds to CORESET # a, the 2 nd PDCCH corresponds to CORESET # b, and if a < b, the count value N corresponding to the count DAI in the 1 st PDCCH is smaller than the count value N' corresponding to the count DAI in the 2 nd PDCCH. The total DAI (if any) values in the 1 st repeated PDCCH and the 2 nd repeated PDCCH correspond to the number of PDCCHs transmitted by the current monitoring time.
Case D: different monitoring time, different partial bandwidth index.
In this case, the PDCCHs repeatedly transmitted by the network device K times are located at the same monitoring time, and the indexes of the bandwidth parts corresponding to the PDCCH candidates are different. The K repeated transmissions of the PDCCH each include different counting DAI values, and the respective corresponding counting DAI values are related to the indices of their corresponding bandwidth parts. For example, K =2, the 1 st PDCCH and the 2 nd PDCCH correspond to the same PDSCH scheduling. The 1 st PDCCH corresponds to a bandwidth part index # a, the 2 nd PDCCH corresponds to a bandwidth part index # b, and if a < b, a count DAI corresponding count value N in the 1 st PDCCH is less than a count DAI corresponding count value N' in the 2 nd PDCCH. The total DAI (if any) values in the 1 st repeated PDCCH and the 2 nd repeated PDCCH correspond to the number of PDCCHs transmitted by the current monitoring time.
Case E: different monitoring moments, the same CORESET, and the same search space set.
Case F: different monitoring moments, the same CORESET, different search space sets.
Case G: different monitoring times, different CORESET.
For three cases of E, F, and G, the PDCCH repeatedly transmitted by the network device K times is located at different monitoring times. The K number of repeatedly transmitted PDCCHs each include a different count DAI value. For example, K =2, the 1 st PDCCH and the 2 nd PDCCH correspond to the same PDSCH scheduling. And the 1 st repeated PDCCH corresponds to the monitoring time # a, and the 2 nd repeated PDCCH corresponds to the monitoring time # b, so that the counting DAI in the 1 st repeated PDCCH corresponds to the HARQ window, and the 1 st repeated PDCCH corresponds to the counting value in the window according to the sequencing sequence of the first serving cell index and the second monitoring time. And counting DAI in the 2 nd repeated PDCCH corresponds to a counting value in an HARQ window, and the 2 nd repeated PDCCH is a counting value corresponding to a sequencing sequence of first serving cell index and second monitoring time in the window. The count DAI corresponding count value N in the 1 st duplicated PDCCH is smaller than the count DAI corresponding count value N' in the 2 nd duplicated PDCCH. The total DAI (if any) values in the 1 st repeated PDCCH and the 2 nd repeated PDCCH correspond to the number of PDCCHs transmitted by the current monitoring time.
In cases a to G, for example, if K =2 and there is no other non-duplicate PDCCH between duplicate PDCCHs, N' = N +1.
When the PDCCH is repeatedly transmitted K times, 2 or more combinations of a, B, C, D, E, F, and G may be used. For example, K =4, where a relationship between the 1 st PDCCH and the 2 nd PDCCH satisfies case a, a relationship between the 1 st PDCCH and the 3 rd PDCCH satisfies case C, and a relationship between the 3 rd PDCCH and the 4 th PDCCH satisfies case G. The counting DAI values in the 1 st PDCCH and the 2 nd PDCCH are different depending on the corresponding first CCE indexes, and the counting DAI values in the 1 st PDCCH and the 3 rd PDCCH are different depending on the corresponding CORESET indexes. The counting DAI values of the 3 rd repeated PDCCH and the 4 th repeated PDCCH are different depending on the respective monitoring times.
The above-described embodiment describes only the ordering rule of the count DAIs included in each of the PDCCHs repeatedly transmitted K times. If the network device also transmits a non-duplicate PDCCH for scheduling other PDSCHs to the terminal device during the repeated transmission of the PDCCH to the terminal device, the count values indicated by the count DAIs included in the non-duplicate PDCCHs are in the same manner as the duplicate PDCCHs. Namely, the value of the counting DAI in the PDCCH corresponding to the HARQ window corresponding to the time for feeding back the HARQ-ACK by the network equipment is determined according to at least one of the index of the 1 st CCE corresponding to the PDCCH, the search space corresponding to the PDCCH and the index of the CORESET corresponding to the PDCCH. That is, in the method of position ordering, the PDCCH includes the duplicate PDCCH and a non-duplicate PDCCH.
Step 201, determining the bit number of an HARQ-ACK codebook and each HARQ-ACK message according to the searched DAI field of the PDCCH;
for example, in the case of a liquid,
the 1 PDCCH set transmitted by the network device includes K (K is a natural number, for example, 2) repeated PDCCHs and N (N is a natural number, for example, 8) non-repeated PDCCHs. The terminal equipment searches the PDCCH set; 1 duplicate PDCCH is lost, and M (M is a natural number, for example, 7) non-duplicate PDCCHs and K-1 duplicate PDCCHs are searched by the terminal device. The terminal equipment can determine 1 PDCCH recovery set, wherein the PDCCH recovery set comprises M non-repeated PDCCHs and K-1 repeated PDCCHs;
the terminal equipment determines the bit number and the content of the HARQ-ACK codebook according to all DAI fields of the PDCCH recovery set, namely the searched DAI fields of K-1 (for example, 1) repeated PDCCHs and the searched DAI fields of M (for example, 7) non-repeated PDCCHs. For example, the technical scheme that the number of bits and the content of the HARQ-ACK codebook are determined according to all DAI fields of 1 PDCCH set, which is given in section 9.1 of 3gpp ts 38.213vf20.
Preferably, when the PDCCH that is repeatedly transmitted indicates the same PDSCH, the information corresponding to the PDCCH that is correctly received in the HARQ-ACK codebook is ACK, and the information corresponding to the PDCCH that is incorrectly received in the HARQ-ACK codebook is NACK, under the condition that the PDSCH is correctly received.
Step 202, the terminal equipment sends the HARQ-ACK codebook.
Fig. 5 is a schematic diagram of multiple PDCCH repetitions corresponding to 1 PDSCH set, and shows that the PDCCH is used for scheduling 1 target PDSCH set, where:
fig. 5 (a) a plurality of repeated PDCCHs respectively schedule a plurality of repeated PDSCHs; in the figure, PDCCH 1-3 are 3 repeated PDCCH; PDSCHs 1-3 are 3 repeated PDSCHs; PDCCHs 1-3 schedule PDSCHs 1-3, respectively. That is to say, the repeated PDCCHs, namely PDCCHs 1 to 3, are used to schedule 1 target PDSCH set, where the target PDSCH set includes the repeated PDSCHs with the same number as the repeated PDCCHs, and each repeated PDCCH corresponds to 1 PDSCH in the PDSCH set; in the present embodiment, 3 repeated PDSCHs, i.e., PDSCHs 1 to 3, are included.
Fig. 5 (b) multiple duplicate PDCCHs collectively scheduling multiple duplicate PDSCHs; in the figure, PDCCH 1-3 are 3 repeated PDCCH; PDSCHs 1-2 are 2 repeated PDSCHs; the PDCCH 1-3 uniformly schedules the PDSCHs 1-2, meaning that the PDCCH1 is used for scheduling the PDSCHs 1-2 integrally; PDCCH2 is used for scheduling PDSCH 1-2 as a whole; PDCCH3 is used to schedule PDSCH 1-2 as a whole. That is, each PDCCH, i.e., PDCCHs 1 to 3, is used to schedule the same 1 target PDSCH set, which includes 2 repeated PDSCHs.
Fig. 5 (c) multiple duplicate PDCCHs schedule 1 PDSCH; in the figure, PDCCH 1-3 are 3 repeated PDCCH; PDCCHs 1 to 3 are all used to schedule the same 1 PDSCH. That is, each PDCCH, i.e., PDCCHs 1 to 3, is used to schedule the same 1 target PDSCH set, which includes 1 PDSCH.
If the repeated PDSCH is uniformly scheduled by the K repeated PDCCHs according to the PDCCH set of fig. 5 (b) or the single PDSCH according to fig. 5 (c), the UE may acquire the L (L < K) th PDCCH before acquiring the scheduling information of the PDSCH and correctly demodulate the PDSCH. If the HARQ-ACK information corresponding to each PDCCH feeds back ACK, the information obtained by the base station is redundant. On the contrary, in the embodiment, when the PDCCH and the corresponding PDSCH are both demodulated correctly, the ACK is fed back at the HARQ-ACK information corresponding to the PDCCH, which is beneficial for the base station to subsequently configure the retransmission times, the transmission mode, and the like of the PDCCH.
And if the terminal equipment does not receive the high-level configuration signaling PUCCH HARQ-ACK space binding, the terminal equipment receives the high-level configuration signaling DCI scheduling maximum code word number, and each PDCCH corresponding to the HARQ window corresponding to the Slot n corresponds to the HARQ-ACK feedback information of 2 bits. The terminal equipment determines HARQ-ACK information fed back in the Slot n as the number DAI according to the counting number in each PDCCH corresponding to the HARQ window corresponding to the Slot n and the total number DAI (if any)
Figure GDA0003969883540000151
Wherein, the first and the second end of the pipe are connected with each other,
Figure GDA0003969883540000152
corresponding to the count DAI in the 1 st duplicated PDCCH; />
Figure GDA0003969883540000153
Corresponding to the count DAI in the 2 nd repeated PDCCH; />
Figure GDA0003969883540000154
Corresponding to the count DAI in the 3 rd repeated PDCCH. If the UE fails to receive the 1 st PDCCH repetition, the 1 st PDCCH repetition and the 2 nd PDCCH repetition are successfully received by combination, and the 1 st PDCCH repetition, the 2 nd PDCCH repetition and the 3 rd PDCCH repetition are also successfully received by combination, then:
Figure GDA0003969883540000155
Figure GDA0003969883540000161
Figure GDA0003969883540000162
note that, in the embodiments of fig. 1 to 5, both the count DAI and the total DAI are expressed in decimal numbers. In the communication system, the maximum integer value range representable by bits of the count DAI and the total DAI is used as the cycle number, for example, when both the count DAI and the total DAI are represented by 2 bits, the maximum integer value range representable is 4 (for example, from 0 to 3), and then the count DAI and the total DAI are represented in a cycle by modulo 4 of the cycle number.
For example, the values of the count DAI or the total DAI are (both expressed in decimal):
Figure GDA0003969883540000163
for example, when the field value of the count DAI or the total DAI is 3, it is necessary to distinguish whether the actual value represented by it is 4 or 8.
As a further optimized embodiment of the present application, before the step of determining the ordering of the HARQ-ACK information corresponding to the target PDSCH in the HARQ-ACK codebook according to the DAI field and/or the step of determining the number of bits of the HARQ-ACK codebook according to all DAI fields of the PDCCH recovery set, the terminal device performs modulo cyclic correction on the count DAI and the total DAI of each PDCCH.
For example, the method of performing modulo cyclic correction on the count DAI and the total DAI of the duplicate PDCCHs and performing modulo cyclic correction on the DAI field of the duplicate PDCCH according to the number of PDCCHs that have been searched before the position of the duplicate PDCCH is as follows:
actual value = field value + M X [ X/M ] +1 (1)
Where X denotes the number of PDCCHs before the position of the repeated PDCCH, [ ] denotes taking an integer, and M is the number of cycles, e.g., 4.
Modulo cyclic correction is performed on the count DAI and the total DAI of non-duplicate PDCCHs by equation (1), with X representing the number of PDCCHs before the position of the non-duplicate PDCCH.
It should be noted that the number of bits of the HARQ-ACK codebook according to each embodiment of the present invention is used to reflect the amount of HARQ-ACK information, and the amount of information may also be represented by "number of bytes of the HARQ-ACK codebook" or other units indicating how much the amount of information is, and the implementation process of the embodiment is similar to that described in each embodiment.
FIG. 6 is a schematic diagram of a system embodiment of the present invention.
The application also provides a mobile communication system terminal device, which is used for the method of the embodiment of the application, and the terminal device comprises a terminal processing module 20; the terminal processing module is used for: searching the PDCCH set; determining a HARQ-ACK codebook according to the searched DAI field of the PDCCH; and transmitting the HARQ-ACK codebook.
The present application further provides a network device of a mobile communication system, which is used in the method according to the embodiment of the present application, and includes a network processing module 10, configured to generate and send the PDCCH set, and receive the HARQ-ACK codebook.
The application also provides a mobile communication system, which comprises the terminal device in any embodiment of the application and the network device in any embodiment of the application.
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 is also 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 phrases "comprising 1 of \8230;" does not exclude the presence of additional like elements in the 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 data scheduling method for a terminal device in a mobile communication system, the method comprising the steps of:
searching a PDCCH set comprising at least 2 repeated PDCCHs; the repeated PDCCH is used for scheduling 1 target PDSCH set and comprises 1 PDSCH or at least 2 repeated PDSCHs;
the value of the DAI field of each PDCCH in the PDCCH set is determined according to the position sequence of each PDCCH in the PDCCH set;
the position ordering is according to the identification of the transmission resource occupied by each PDCCH in the PDCCH set: at least 1 item of values in the monitoring time, the service cell index, the bandwidth part index, the CORESET index, the search space index and the CCE index are arranged from small to large;
determining the bit number of an HARQ-ACK codebook and each HARQ-ACK message according to the searched DAI field of the PDCCH;
and transmitting the HARQ-ACK codebook.
2. A data scheduling method in a mobile communication system, when used in a network device, comprising the steps of:
transmitting a PDCCH set comprising at least 2 repeated PDCCHs; the repeated PDCCH is used for scheduling 1 target PDSCH set and comprises 1 PDSCH or at least 2 repeated PDSCHs;
the value of the DAI field of each PDCCH in the PDCCH set is determined according to the position sequence of each PDCCH in the PDCCH set;
the position ordering method is that according to the identification of the transmission resource occupied by each PDCCH in the PDCCH set: at least 1 item of values in the monitoring time, the service cell index, the bandwidth part index, the CORESET index, the search space index and the CCE index are arranged from small to large.
3. The data scheduling method of claim 2, further comprising the following steps when applied to the terminal device:
searching a PDCCH set, wherein the PDCCH set comprises at least 2 repeated PDCCHs; the repeated PDCCH is used for scheduling 1 target PDSCH set and comprises 1 PDSCH or at least 2 repeated PDSCHs;
determining the bit number of an HARQ-ACK codebook and each HARQ-ACK message according to the searched DAI field of the PDCCH;
and transmitting the HARQ-ACK codebook.
4. The method of any one of claims 1 to 3, wherein the DAI field contains a count DAI;
and the value of the counting DAI of each PDCCH represents the position-ordered sequence number of each PDCCH in the PDCCH set.
5. The method of any one of claims 1 to 3, wherein the DAI field contains a total amount of DAI;
and the value of the total DAI of each PDCCH in the PDCCH set represents the total number of PDCCHs scheduled in the HARQ window by the PDCCH set at the monitoring time of each PDCCH.
6. The method of any one of claims 1 to 3, wherein the method of position ordering further comprises:
and when the monitoring time of any 2 PDCCHs in the PDCCH set is the same, arranging the numerical values of the CORESET indexes or the bandwidth part indexes of the any 2 PDCCHs from small to large.
7. The method of any one of claims 1 to 3, wherein the method of position ordering further comprises:
and when the monitoring time of any 2 PDCCHs in the PDCCH set is the same as the CORESET index, arranging the numerical values of the search space indexes of the any 2 PDCCHs from small to large.
8. The method of any one of claims 1 to 3, wherein the method of position ordering further comprises:
and when the monitoring time, the serving cell index, the CORESET index and the search space index of any 2 PDCCHs in the PDCCH set are the same, arranging the numerical values of the first CCE indexes of the any 2 PDCCHs from small to large.
9. A mobile communication system terminal device for use in the method of claim 1 or 3, comprising a terminal processing module;
the terminal processing module is used for:
searching the PDCCH set;
determining a HARQ-ACK codebook according to the searched DAI field of the PDCCH;
and transmitting the HARQ-ACK codebook.
10. A mobile communication system network device for use in the method of claim 2 or 3, comprising a network processing module;
and the network processing module is used for generating and sending the PDCCH set and receiving the HARQ-ACK codebook.
11. A mobile communication system comprising the terminal device of claim 9 and the network device of claim 10.
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