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CN111277368B - Method and device for determining actual repeated transmission times of control channel, storage medium and terminal - Google Patents

Method and device for determining actual repeated transmission times of control channel, storage medium and terminal Download PDF

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Publication number
CN111277368B
CN111277368B CN202010065229.9A CN202010065229A CN111277368B CN 111277368 B CN111277368 B CN 111277368B CN 202010065229 A CN202010065229 A CN 202010065229A CN 111277368 B CN111277368 B CN 111277368B
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interval
subframe
control channel
dci
repeated
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CN111277368A (en
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冯侨
朱志辉
谭舒
姚丽平
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Unisoc Chongqing Technology Co Ltd
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Unisoc Chongqing Technology Co Ltd
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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
    • H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • 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
    • H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
    • 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
    • H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
    • H04L1/0038—Blind format detection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A method and device for determining the actual repeated transmission times of a control channel, a storage medium and a terminal are provided. The method comprises the following steps: determining a plurality of repeated transmission times indication tables; performing first interval first blind detection on the control channel on a first subframe group of a first subframe interval; and if the first interval first DCI is obtained by the first interval first blind test, determining whether to determine the actual repeated sending times according to the result of the first interval second blind test on the control channel on the second subframe group of the first subframe interval and the result of the second interval first blind test on the control channel on the first subframe group of the second subframe interval according to the first interval first DCI. The method can judge the actual repetition times of the control channel according to the blind detection information of the control channel, is beneficial to improving the judgment accuracy and reducing the judgment complexity.

Description

Method and device for determining actual repeated transmission times of control channel, storage medium and terminal
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for determining an actual number of repeated transmissions of a control channel, a storage medium, and a terminal.
Background
In the existing communication system, better blind detection performance is obtained by using control channel repeated transmission. The network selects a certain number of repetitions within the maximum number of repetitions of the Control channel, and the Downlink Control Information (DCI) loads (payload) used within the actual number of repetitions are completely the same. The actual number of possible repetitions of the control channel may optionally be indicated in the DCI payload.
For some DCI formats (formats), no indication of the actual number of repetitions of the control channel is shown in the DCI payload. And the terminal needs to acquire the actual number of repetitions of the control channel to determine the time at which the grant is effective. For example, DCI for transmission power control needs to determine the actual number of times of retransmission according to the subframe number of the last retransmission of a control channel corresponding to Transmission Power Control (TPC), and the subframe number of the last retransmission is difficult to be determined accurately, which results in inaccurate determination of the actual number of times of retransmission.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method and a device for determining the actual repeated sending times of a control channel, a storage medium and a terminal, which can judge the actual repeated times of the control channel according to the blind detection information of the control channel, are favorable for improving the judgment accuracy and reducing the judgment complexity.
In order to solve the above technical problem, an embodiment of the present invention provides a method for determining an actual number of times of repeated transmissions of a control channel, including the following steps: determining a plurality of repeated transmission times indication tables, wherein different repeated transmission times indication tables are used for indicating each subframe interval when different repeated transmission times are adopted, the subframe interval refers to a subframe capable of detecting a control channel, and the subframe interval comprises a plurality of repeated transmission times of subframes; performing first interval first blind detection on the control channel on a first subframe group of a first subframe interval, wherein the first subframe interval is each subframe interval in a first repeated transmission time indication table, and the first subframe group is a plurality of subframes of a first repeated time from a starting subframe k 0; if the first interval first blind test obtains first interval first DCI, determining whether to determine actual repeated transmission times according to a result of a first interval second blind test performed on the control channel on a second subframe group of a first subframe interval and a result of a second interval first blind test performed on the control channel on a first subframe group of a second subframe interval according to the first interval first DCI, wherein the second subframe interval is each subframe interval in a second repeated transmission times indication table, the second subframe group of the first subframe interval is a plurality of subframes with a first repeated time from a starting subframe k1, and the first subframe group of the second subframe interval is a plurality of subframes with a second repeated time from a starting subframe k 0; wherein the second number of repeated transmissions is greater than the first number of repeated transmissions.
Optionally, determining, according to the first DCI of the first interval, whether to perform a second blind detection of the control channel in the first interval on the second subframe group of the first subframe interval and determine an actual number of times of repeated transmissions according to a result of a first blind detection of the control channel in the second interval on the first subframe group of the second subframe interval includes: and if the FA value of the first DCI in the first interval is smaller than or equal to a first preset FA threshold, determining the actual repeated transmission times according to the result of the first interval second blind detection on the control channel on a second subframe group in the first subframe interval and the result of the second interval first blind detection on the control channel on the first subframe group in the second subframe interval.
Optionally, the first preset FA threshold is 0.2 × Len; and the Len is used for performing hard decision on the soft information input by decoding to obtain the number of non-0 in the second sequence.
Optionally, determining the actual number of times of repeated transmissions according to the result of the first interval second blind detection performed on the control channel in the second subframe group of the first subframe interval and according to the result of the second interval first blind detection performed on the control channel in the first subframe group of the second subframe interval includes: and if the second DCI in the first interval is obtained by the second blind detection in the first interval and the first DCI in the second interval is not obtained by the first blind detection in the second interval, judging that the actual repeated transmission times are the first repeated transmission times.
Optionally, determining the actual number of repeated transmissions according to a result of the first interval second blind detection performed on the control channel in the second subframe group of the first subframe interval and according to a result of the second interval first blind detection performed on the control channel in the first subframe group of the second subframe interval includes: and if the second DCI in the first interval is obtained by the second blind detection in the first interval and the first DCI in the second interval is obtained by the first blind detection in the second interval, judging that the actual repeated transmission times are greater than the first repeated transmission times.
Optionally, determining the actual number of times of repeated transmissions according to the result of the first interval second blind detection performed on the control channel in the second subframe group of the first subframe interval and according to the result of the second interval first blind detection performed on the control channel in the first subframe group of the second subframe interval includes: and if the first interval second DCI is not obtained by the first interval second blind detection and the second interval first DCI is obtained by the second interval first blind detection, determining the actual repeated transmission times at least according to the first average power of the first interval second DCI and the second average power of the second interval first DCI.
Optionally, determining the actual number of times of repeated transmission at least according to the first average power of the second DCI in the first interval and the second average power of the first DCI in the second interval includes: if the quotient of the first average power and the second average power is larger than a preset power threshold value, judging that the actual repeated sending times are the first repeated sending times; and if the quotient of the first average power and the second average power is less than or equal to the preset power threshold, determining the actual repeated transmission times according to the FA value of the first DCI in the first interval and the FA value of the first DCI in the second interval.
Optionally, the preset power threshold is 10.
Optionally, determining the actual number of times of repeated transmission according to the FA value of the first DCI in the first interval and the FA value of the first DCI in the second interval includes: if the difference value between the FA value of the first DCI in the first interval and the FA value of the first DCI in the second interval is larger than a second preset FA threshold value, judging that the actual repeated transmission times are the first repeated transmission times; and if the difference value between the FA value of the first DCI in the first interval and the FA value of the first DCI in the second interval is smaller than or equal to a second preset FA threshold, judging that the actual repeated transmission times are larger than the first repeated transmission times.
Optionally, the second preset FA threshold is 0.2 × Len × 0.3; and the Len is used for performing hard decision on the soft information input by decoding to obtain the number of non-0 in the second sequence.
Optionally, the method for determining the actual number of times of repeated transmissions of the control channel further includes: performing a first interval Mth blind test on the control channel on an Mth subframe group of the first subframe interval, wherein the Mth subframe group is a self-starting subframe k M-1 A first number of repeated subframes; if the starting subframe of the mth subframe group of the first subframe section is the same as the starting subframe of the ((M-1)/2+1) th subframe group of the second subframe section and the mth blind detection of the first section obtains mth DCI, determining whether to determine the actual number of repeated transmissions according to the result of the mth +1 th blind detection of the first section for the control channel on the mth +1 th subframe group of the first subframe section and the result of the ((M-1)/2+1) th blind detection of the second section for the control channel on the ((M-1)/2+1) th subframe group of the second subframe section according to the mth DCI of the first section; wherein M is an odd number and M is more than or equal to 1.
Optionally, the method for determining the actual number of times of repeated transmission of the control channel further includes: sequentially carrying out the Mth blind test of the Nth-1 interval on the control channel on the Mth subframe group of the Nth-1 subframe interval, wherein the Mth subframe group is a self-starting subframe k M-1 Starting from the N-1 st subframe, repeating the plurality of subframes; if the starting subframe of the Mth subframe group of the Nth subframe interval and the (M-1)/(2) th subframe interval of the Nth subframe interval are within the same interval N-1 ) Starting sub-frames of the +1 sub-frame group are the same, and the Mth DCI in the N-1 th interval is obtained through the Mth blind detection in the N-1 th interval, whether the M +1 th interval M +1 blind detection result of the control channel in the N-1 th interval on the M +1 th sub-frame group in the N-1 th sub-frame interval is used or not is determined according to the Mth DCI in the N-1 th interval, and according to the (M-1)/(2) th interval in the N-1 th sub-frame interval N-1 ) (M-1)/(2) nth interval for the control channel on +1 subframe group N-1 ) +1 blind detection result, determining actual repeated sending times; wherein the N-1 sub-frame interval is each sub-frame interval in the N-1 repeated transmission times indication table, and the N sub-frame interval is each sub-interval in the N repeated transmission times indication tableA frame interval, the Mth subframe group of the N-1 th subframe interval is a self-starting subframe k M-1 Starting from the Nth sub-frame interval, repeating several sub-frames to the Nth sub-frame interval of (M-1)/(2) N-1 ) The +1 subframe group is a self-start subframe k M-1)/( 2 N-1 ) A plurality of subframes are repeated for N times, wherein N is a positive integer and is greater than 2, and the number of repeated transmission times is increased from the first repeated transmission time to the Nth repeated transmission time; wherein, every time the actual repeated transmission times is judged to be larger than the N-1 repeated transmission times, adding 1 to the value of N.
Optionally, the control channel belongs to an eMTC system or an MF system.
Optionally, N is less than or equal to 4.
To solve the foregoing technical problem, an embodiment of the present invention provides an apparatus for determining an actual number of times of repeated transmissions of a control channel, including: an indication table determining module, adapted to determine multiple repeated transmission times indication tables, where different repeated transmission times indication tables are used to indicate each subframe interval when different repeated transmission times are adopted, where a subframe interval refers to a subframe in which a control channel can be detected, and the subframe interval includes multiple repeated transmission times subframes; a first blind detection module, adapted to perform a first interval first blind detection on the control channel on a first subframe group of a first subframe interval with a first retransmission number, where the first subframe interval is each subframe interval in a first retransmission number indicator, and the first subframe group is a first repetition number of subframes from a starting subframe k 0; an actual number determining module, adapted to determine whether to determine an actual number of repeated transmissions according to a result of a first-interval second blind detection performed on the control channel on a second subframe group of a first subframe interval and a result of a second-interval first blind detection performed on the control channel on a first subframe group of a second subframe interval when the first interval first blind detection obtains first interval first DCI, where the second subframe interval is each subframe interval in a second repeated transmission number indication table, the second subframe group of the first subframe interval is a first repeated number of subframes from a starting subframe k1, and the first subframe group of the second subframe interval is a second repeated number of subframes from a starting subframe k 0; wherein the second number of repeated transmissions is greater than the first number of repeated transmissions.
To solve the above technical problem, an embodiment of the present invention provides a storage medium having stored thereon computer instructions, which when executed, perform the steps of the above method for determining the actual number of times of repeated transmissions of a control channel.
In order to solve the above technical problem, an embodiment of the present invention provides a terminal, including a memory and a processor, where the memory stores computer instructions capable of being executed on the processor, and the processor executes the steps of the method for determining the actual number of times of repeated transmission of the control channel when executing the computer instructions.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, a plurality of repeated transmission times indication tables are determined, different repeated transmission times indication tables are used for indicating each subframe interval when different repeated transmission times are adopted, the subframe interval refers to a subframe capable of detecting a control channel, and the subframe interval comprises a plurality of repeated transmission times of subframes; performing first interval first blind detection on the control channel on a first subframe group of a first subframe interval, wherein the first subframe interval is each subframe interval in a first repeated transmission time indication table, and the first subframe group is a plurality of subframes of a first repeated time from a starting subframe k 0; if the first interval first blind test obtains first interval first DCI, determining whether to determine actual repeated transmission times according to a result of a first interval second blind test performed on the control channel on a second subframe group of a first subframe interval and a result of a second interval first blind test performed on the control channel on a first subframe group of a second subframe interval according to the first interval first DCI, wherein the second subframe interval is each subframe interval in a second repeated transmission times indication table, the second subframe group of the first subframe interval is a plurality of subframes with a first repeated time from a starting subframe k1, and the first subframe group of the second subframe interval is a plurality of subframes with a second repeated time from a starting subframe k 0; wherein the second number of repeated transmissions is greater than the first number of repeated transmissions. By adopting the scheme, when the first interval first blind test is carried out, and the first interval first DCI is obtained by the first interval first blind test, whether the actual repeated transmission times are determined according to the result of the first interval second blind test carried out on the control channel on the second subframe group of the first subframe interval and the result of the second interval first blind test carried out on the control channel on the first subframe group of the second subframe interval is determined according to the first interval first DCI of the first subframe interval, compared with the prior art, the actual repeated transmission times need to be determined according to the subframe number of the last repeated transmission of the MPDCCH corresponding to the TPC, and the accurate determination of the subframe number of the last repeated transmission is difficult to realize, so that the actual repeated transmission times are inaccurate, the actual repeated times of the control channel can be determined according to the blind test information of the control channel by adopting the scheme of the embodiment of the invention, the accuracy of judgment is improved, and the complexity of judgment is reduced.
Further, in the embodiment of the present invention, whether to determine the actual number of times of repeated transmission according to the result of the second blind test in the first interval and the result of the first blind test in the second interval is determined according to the comparison result between the FA value of the first DCI and the first preset FA threshold, which can avoid further performing the step of determining the actual number of times of repeated transmission under the condition that the first blind test finds the virtual test, and effectively control the operation overhead.
Further, in the embodiment of the present invention, the actual number of times of the repeated transmission is determined according to the comparison result between the first power and the second power and the comparison result between the FA value of the second DCI and the FA value of the third DCI, so that the accuracy of the determination can be further improved.
Further, in the embodiment of the present invention, the M +1 th blind test result in the N-1 th interval and the (M-1)/(2) th interval N-1 ) And determining the actual repeated sending times according to the blind detection result of +1, and continuously judging whether the actual repeated sending times are the Nth repeated times and the (N +1) th repeated times..., until the actual repeated sending times are accurately judged, which is helpful to improve the accuracy of judging the repeated sending times.
Drawings
Fig. 1 is a flowchart of a method for determining an actual number of retransmissions of a control channel according to an embodiment of the present invention;
fig. 2 is a flowchart of another method for determining an actual number of retransmissions of a control channel in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an apparatus for determining an actual number of repeated transmissions of a control channel according to an embodiment of the present invention.
Detailed Description
In the existing communication system, better blind detection performance is obtained by using control channel repeated transmission. The actual number of possible repetitions of the control channel may be indicated in the DCI payload, however, for some DCI formats, the actual number of repetitions of the control channel is not indicated in the DCI payload, and the terminal needs to acquire the actual number of repetitions of the control channel to determine the time when the grant is effective.
The inventors of the present invention have studied and found that, for a control channel whose DCI format (format) is 3/3a, the actual number of repetitions indicating the control channel is not shown in DCI payload. The DCI format 3/3a carries TPC information of a Physical Uplink Shared Channel (PUSCH)/Physical Uplink Control Channel (PUCCH), and a terminal needs to determine a subframe number at which a TPC acts according to a subframe number of a last retransmission of a control Channel corresponding to the TPC and a timing relationship of a PUSCH/PUCCH subframe. In the prior art, it is difficult to accurately determine the subframe number of the last retransmission of the machine type communication PDCCH (MTC PDCCH, also referred to as MPDCCH) corresponding to the TPC, which results in lower accuracy of the existing method for determining the actual number of retransmissions of the control channel.
In the embodiment of the invention, a plurality of repeated transmission times indication tables are determined, different repeated transmission times indication tables are used for indicating each subframe interval when different repeated transmission times are adopted, the subframe interval refers to a subframe capable of detecting a control channel, and the subframe interval comprises a plurality of repeated transmission times of subframes; performing first interval first blind detection on the control channel on a first subframe group of a first subframe interval, wherein the first subframe interval is each subframe interval in a first repeated transmission time indication table, and the first subframe group is a plurality of subframes of a first repeated time from a starting subframe k 0; if the first interval first blind test obtains first interval first DCI, determining whether to determine actual repeated transmission times according to a result of a first interval second blind test performed on the control channel on a second subframe group of a first subframe interval and a result of a second interval first blind test performed on the control channel on a first subframe group of a second subframe interval according to the first interval first DCI, wherein the second subframe interval is each subframe interval in a second repeated transmission times indication table, the second subframe group of the first subframe interval is a plurality of subframes with a first repeated time from a starting subframe k1, and the first subframe group of the second subframe interval is a plurality of subframes with a second repeated time from a starting subframe k 0; wherein the second number of repeated transmissions is greater than the first number of repeated transmissions. By adopting the scheme, when the first interval first blind test is carried out, and the first interval first DCI is obtained through the first interval first blind test, whether the actual repeated transmission times are determined according to the result of the first interval second blind test carried out on the control channel on the second subframe group of the first subframe interval and the result of the second interval first blind test carried out on the control channel on the first subframe group of the second subframe interval is determined according to the first interval first DCI of the first interval, compared with the prior art, the actual repeated transmission times need to be determined according to the subframe number of the last repeated transmission of the control channel corresponding to the TPC, and the subframe number of the last repeated transmission is difficult to realize accurate determination, so that the actual repeated transmission times are determined inaccurately, the actual repeated transmission times can be determined according to the blind test information of the control channel by adopting the scheme of the embodiment of the invention, the accuracy of judgment is improved, and the complexity of judgment is reduced.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below.
Referring to fig. 1, fig. 1 is a flowchart of a method for determining an actual number of repeated transmissions of a control channel according to an embodiment of the present invention. The method may include steps S11 through S13:
step S11: determining a plurality of repeated transmission times indication tables, wherein different repeated transmission times indication tables are used for indicating each subframe interval when different repeated transmission times are adopted, the subframe interval refers to a subframe capable of detecting a control channel, and the subframe interval comprises a plurality of repeated transmission times of subframes;
step S12: performing first interval first blind detection on the control channel on a first subframe group of a first subframe interval;
step S13: if the first interval first DCI is obtained by the first interval first blind test, determining whether to determine the actual repeated sending times according to the result of the first interval second blind test on the control channel on the second subframe group of the first subframe interval and the result of the second interval first blind test on the control channel on the first subframe group of the second subframe interval according to the first interval first DCI;
the first subframe interval is each subframe interval in a first retransmission time indication table, and the first subframe group is a number of subframes with a first repetition time from a starting subframe k 0.
The second subframe interval is each subframe interval in a second retransmission number indication table, the second subframe group of the first subframe interval is a first repetition number of subframes from a starting subframe k1, and the first subframe group of the second subframe interval is a second repetition number of subframes from a starting subframe k 0. Where k1 is the 1 st consecutive valid downlink subframe from k 0.
Wherein the second number of repeated transmissions is greater than the first number of repeated transmissions.
In a specific implementation of step S11, for the repeated transmission of the control channel, the multiple repeated transmission number indication tables are used to indicate each subframe interval when different repeated transmission numbers are adopted, and the number of subframes included in the subframe interval is the repeated transmission number.
In this embodiment of the present invention, the Control Channel may be a Physical Downlink Control Channel (PDCCH), and may be repeatedly sent to the Control Channel, and sent for the first time in a subframe k0, where k0 is referred to as a starting subframe, that is, the network element device (i.e., the network end) continuously and repeatedly sends r times, and payloads (payload) of the DCI used for the r times sent are completely the same. The actual sending frequency r of the network may be 2n, n is 0, 1,2, 3.. 8, and specific data of the actual sending frequency r may be set according to actual application requirements, which is not limited in this embodiment.
In a specific application, when the network configures the DCI, the network may display an indication of the actual repetition number of the control channel in payload of the DCI. In the process of wireless communication, a terminal device (i.e., a receiving end) needs to detect the control channel in a candidate Search space (Search space) to obtain decoded DCI, and since the terminal device usually cannot predict in advance where information to be received is located, the process of detecting the control channel is called blind detection, i.e., blind detection of possible control channel candidates. Further, for the control channel with repeated transmission, the terminal device may perform control channel blind detection on the valid downlink subframe to obtain the DCI.
It should be noted that enhanced machine-type communication (eMTC) is introduced into Long Term Evolution (LTE) system by The third Generation Partnership Project (3 GPP). Among them, the MPDCCH (i.e., eMTC physical downlink control channel) in the eMTC system employs repeated transmission. In addition, the MF system (Multefire) is a technology based on LTE, and is directed to a small base station operating only on an unlicensed spectrum, and the MPDCCH in the system also uses a repeated transmission, and the principle of the repeated transmission is the same as that of the MPDCCH in the above-mentioned 3 GPP.
Accordingly, in the present embodiment, xPDCCH is defined to represent various PDCCHs, where x may represent MPDCCH in the eMTC system or the MF system of 3 GPP.
For example, in the embodiment of the present disclosure, the maximum number of transmissions of the network is selected to be 8, and a blind detection process of the control channel is described, that is, the actual number of repeated transmissions of the network may be r 1-1, r 2-2, r 3-4, and r 4-8. Accordingly, the terminal device does not know the repetition times before performing blind detection on the repeatedly transmitted xPDCCH, and needs to perform blind detection on all rj, j e {1,2,3,4 }. In the process of blind detection, xPDCCH searching space starts from a subframe k to k b ，k b Is from k 0 The first (b) th continuous valid downlink subframe (i.e. the subframe that can be used to transmit the downlink control channel, for xPDCCH, the valid downlink subframe is BL/CE DL subframe), the specific position of the starting subframe can be determined according to the maximum transmission times and the search space, i.e. the specific value of b can be determined according to the type of the search space.
Aiming at a user equipment specific search space (UE-specific search space), a Type0-xPDCCH common search space (Type0-xPDCCH common search space), a Type2-xPDCCH common search space (Type2-xPDCCH common search space), a Type1A-xPDCCH common search space (Type1A-xPDCCH common search space) and a Type2A-xPDCCH common search space (Type2A-xPDCCH common search space) in an eMTC system xPDCCH; and xPCHUE-specific search space, Type0-xPDCCH common search space and Type2-xPDCCH common search space in the xPDCCH of the MF system.
The principle of repeated transmission of each xPDCCH is the same, and the initial subframe k of the xPDCCH searching space is equal to k b Can be determined by the following formula:
Figure BDA0002375769620000101
wherein r is max For the maximum number of repetitions of the control channel (e.g., 8), j ∈ {1,2,3,4}, rj is the actual number of repetitions possible for the control channel (r 1, r2 2, r3 4, r4 8), where different rj and k are different b Corresponding xPThe repeated transmission pattern (pattern) of the DCCH is shown in table 1:
TABLE 1
Figure BDA0002375769620000102
Figure BDA0002375769620000111
As shown in table 1, the first subframe section is each subframe section in a first retransmission number indication table, the first subframe group is a first number of repetitions of subframes from a starting subframe k0, and for example, when a reallocation parameter (xPDCCH with num of repetition) for indicating the number of repetitions of xPDCCH, xPDCCH with num of repetition ═ 1 (that is, rj ═ r1), each subframe group can be obtained as subframes 1 to 6 of radio frame 0 and subframes 1 to 2 of radio frame 1, respectively; when xPDCCH with num of repetition is 2 (i.e., rj is r2), each subframe group can be obtained as radio frame 0 subframe 1-2, radio frame 0 subframe 3-4, radio frame 0 subframe 5-6, and radio frame 1 subframe 1-2, respectively; when xPDCCH with num of repetition is 4 (i.e., rj is r3), each subframe group can be obtained as radio frame 0 subframe 1-4 and radio frame 0 subframe 5 to radio frame 1 subframe 2; when xPDCCH with num of repetition is 8 (i.e., rj is r4), the available subframe groups are radio frame 0 subframe 1 to radio frame 1 subframe 2.
In the repeated transmission frequency indication table of the embodiment of the present invention, each table may correspond to a subframe interval, and different subframe intervals have different repeated transmission frequencies, including a plurality of subframes of the repeated transmission frequencies.
In an implementation of step S12, a first interval first blind detection is performed on the control channel on a first subframe group of a first subframe interval.
In the first blind detection process of the first interval, the xPDCCH search space starts from a subframe k0, and if the repeated transmission times of the first subframe interval is 1, the xPDCCH search space is 1 continuous effective downlink subframe from k 0.
The first subframe interval is each subframe interval in a first retransmission time indication table, and the first subframe group is a number of subframes with a first repetition time from a starting subframe k 0. Specifically, for a first subframe interval (i.e., a first retransmission number indication table), blind detection performed on the control channel on a first subframe group is referred to as first interval first blind detection, and blind detection performed on the control channel on a second subframe group is referred to as first interval second blind detection.
In a specific implementation of step S13, if the first interval first blind detection obtains the first interval first DCI, it is determined whether to determine, according to the first interval first DCI, the actual number of times of repeated transmission according to a result of the first interval second blind detection performed on the control channel in the second subframe group of the first subframe interval and according to a result of the second interval first blind detection performed on the control channel in the first subframe group of the second subframe interval.
Specifically, the control channel carries DCI information, and the DCI is carried on the control channel, and in a specific application, when the network configures the DCI, the network may display an indication of the actual repetition number of the control channel in payload of the DCI. In the process of wireless communication, a terminal device (i.e., a receiving end) needs to detect the control channel in a candidate Search space (Search space) to obtain decoded DCI, and further may determine whether to determine the actual number of times of repeated transmission according to a result of a second blind detection in a first interval and a result of a first blind detection in a second interval according to the DCI.
In a first specific implementation manner of the embodiment of the present invention, whether to determine the actual number of times of repeated transmissions according to the result of the second blind test in the first interval and the result of the first blind test in the second interval may be determined by the FA value.
Specifically, in the process of determining the FA value, a first sequence may be obtained by performing convolutional coding on the blind-detected DCI signal, and a second sequence may be obtained by performing hard decision on the soft information input by decoding, and the number of bits (bits) different from the first sequence and the second sequence is counted as the FA value.
If the FA value of the first DCI in the first interval is smaller than or equal to a first preset FA threshold value, determining the actual repeated transmission times according to the result of the first interval second blind detection on the control channel on the second subframe group of the first subframe interval and the result of the second interval first blind detection on the control channel on the first subframe group of the second subframe interval
Further, the first preset FA threshold may be set to 0.2 × Len; the Len can be used for performing hard decision on soft information input by decoding to obtain the number of non-0 in the second sequence.
It should be noted that, in the embodiment of the present invention, the first preset FA threshold may also be set to be y × Len, where a value of y is selected from 0.1 to 0.3.
In the embodiment of the present invention, whether to determine the actual number of times of repeated transmission according to the result of the second blind test in the first interval and the result of the first blind test in the second interval is determined according to the comparison result between the FA value of the first DCI and the first preset FA threshold, so that the step of determining the actual number of times of repeated transmission is avoided from being further performed under the condition that the first blind test finds a dummy test, and the operation overhead is effectively controlled.
Further, the step of determining the actual number of repeated transmissions according to a result of a first interval second blind detection performed on the control channel over a second subframe group of the first subframe interval and according to a result of a second interval first blind detection performed on the control channel over the first subframe group of the second subframe interval may include: and if the second DCI in the first interval is obtained by the second blind detection in the first interval and the first DCI in the second interval is not obtained by the first blind detection in the second interval, judging that the actual repeated transmission times are the first repeated transmission times.
In the embodiment of the invention, the DCI can be obtained by determining the first subframe interval with smaller repetition times through blind detection, and the actual repeated transmission times are judged to be the times of the first subframe interval, thereby being beneficial to improving the accuracy and the rapidness of the judgment.
Further, the step of determining the actual number of repeated transmissions according to a result of a first interval second blind detection performed on the control channel over a second subframe group of the first subframe interval and according to a result of a second interval first blind detection performed on the control channel over the first subframe group of the second subframe interval may include: and if the second DCI in the first interval is obtained by the second blind detection in the first interval and the first DCI in the second interval is obtained by the first blind detection in the second interval, judging that the actual repeated transmission times are greater than the first repeated transmission times.
In the embodiment of the invention, the DCI can be obtained by determining the second subframe interval with larger repetition times through blind detection, and the actual repeated transmission times are judged to be the times of the second subframe interval or the times of the subframe interval with larger repeated transmission times, which is beneficial to improving the accuracy and the rapidness of judgment.
In the embodiment of the present invention, the actual number of times of the repeated transmission is determined according to the comparison result between the first power and the second power and the comparison result between the FA value of the second DCI and the FA value of the third DCI, so that the accuracy of the determination can be further improved.
In a second specific implementation manner of the embodiment of the present invention, whether to determine the actual number of times of repeated transmissions according to the result of the second blind detection in the first interval and the result of the first blind detection in the second interval may be determined by the average power of the DCI.
Wherein the average power of the DCI may be obtained by:
Figure BDA0002375769620000141
further, if the second blind detection in the first interval does not obtain the second DCI in the first interval, and the first blind detection in the second interval obtains the first DCI in the second interval, the actual number of times of the repeated transmission is determined at least according to the first average power of the second DCI in the first interval and the second average power of the first DCI in the second interval.
In the embodiment of the present invention, the actual number of times of the repeated transmission is determined according to whether the DCI is obtained by the second blind test in the first interval and the first blind test in the second interval, and further according to the first average power of the second DCI in the first interval and the second average power of the first DCI in the second interval, so that the step of determining the actual number of times of the repeated transmission is avoided from being further performed under the condition that the virtual test is found by the first blind test, and the operation overhead is effectively controlled.
Further, the step of determining the actual number of repeated transmissions according to at least the first average power of the second DCI in the first interval and the second average power of the first DCI in the second interval may include: if the quotient of the first average power and the second average power is larger than a preset power threshold value, judging that the actual repeated sending times are the first repeated sending times; and if the quotient of the first average power and the second average power is less than or equal to the preset power threshold, determining the actual repeated transmission times according to the FA value of the first DCI in the first interval and the FA value of the first DCI in the second interval.
In the embodiment of the invention, the actual repeated sending times are judged to be the times of the first subframe interval by determining that the quotient of the first average power and the second average power is greater than the preset power threshold, which is beneficial to improving the accuracy and the rapidness of the judgment. Furthermore, the actual repeated sending times are further determined according to the FA value by determining that the quotient of the first average power and the second average power is smaller than or equal to a preset power threshold value, so that shunting judgment can be effectively carried out on various conditions, and the judgment efficiency is improved.
Further, the preset power threshold may be 10.
It should be noted that, in the embodiment of the present invention, the preset power threshold may be further set to be selected from 8 to 12.
Further, if the quotient of the first average power and the second average power is less than or equal to the preset power threshold, the step of determining the actual number of repeated transmissions according to the FA value of the first section first DCI and the FA value of the second section first DCI may include: if the difference value between the FA value of the first DCI in the first interval and the FA value of the first DCI in the second interval is larger than a second preset FA threshold value, judging that the actual repeated transmission times are the first repeated transmission times; and if the difference value between the FA value of the first DCI in the first interval and the FA value of the first DCI in the second interval is smaller than or equal to a second preset FA threshold, judging that the actual repeated transmission times are larger than the first repeated transmission times.
In the embodiment of the present invention, a second preset FA threshold is set, and a relationship between the actual number of times of repeated transmission and the first number of times of repeated transmission is determined according to a comparison between a difference between the FA value of the first DCI in the first interval and the FA value of the first DCI in the second interval and the second preset FA threshold, which is helpful for improving accuracy and rapidity of determination. Furthermore, by setting a second preset FA threshold and further determining the actual repeated sending times according to the second preset FA threshold, shunt judgment can be effectively carried out on various conditions, and the judgment efficiency is improved.
Further, the second preset FA threshold may be 0.2 × Len × 0.3; and the Len is used for performing hard decision on the soft information input by decoding to obtain the number of non-0 in the second sequence.
It should be noted that, in the embodiment of the present invention, the first preset FA threshold may also be set to be zxlen × w, where a value of z is selected from 0.1 to 0.3, and a value of w is selected from 0.2 to 0.4.
In the embodiment of the present invention, by performing a first interval first blind test, and when obtaining a first interval first DCI in the first interval first blind test, determining whether to determine an actual number of repeated transmissions according to a result of a first interval second blind test performed on the control channel on a second subframe group of a first subframe interval and a result of a second interval first blind test performed on the control channel on a first subframe group of a second subframe interval according to the first interval first DCI, compared with the prior art, which needs to determine an actual number of repeated transmissions according to a last repeatedly transmitted subframe number of an MPDCCH corresponding to a TPC, and the last repeatedly transmitted subframe number is difficult to achieve an accurate determination, which results in an inaccurate determination of the actual number of repeated transmissions, according to blind test information of the control channel, the actual number of repeated transmissions of the control channel can be determined by using the scheme of the embodiment of the present invention, the accuracy of judgment is improved, and the complexity of judgment is reduced.
It should be noted that, by the above method for determining the actual number of times of repeated transmissions of the control channel, it may be determined that the correlation operation after the first interval of the first blind detection is performed on the control channel on the first subframe group of the first subframe interval. Further, an mth blind detection of the control channel in the first interval may be performed on the mth subframe group in the first subframe interval.
Further, the method for determining the actual number of times of repeated transmission of the control channel may further include: performing a first interval Mth blind test on the control channel on an Mth subframe group of the first subframe interval, wherein the Mth subframe group is a self-starting subframe k M-1 A first number of repeated subframes; if the starting subframe of the mth subframe group of the first subframe section is the same as the starting subframe of the ((M-1)/2+1) th subframe group of the second subframe section and the mth blind detection of the first section obtains mth DCI, determining whether to determine the actual number of repeated transmissions according to the result of the mth +1 th blind detection of the first section for the control channel on the mth +1 th subframe group of the first subframe section and the result of the ((M-1)/2+1) th blind detection of the second section for the control channel on the ((M-1)/2+1) th subframe group of the second subframe section according to the mth DCI of the first section; wherein M is an odd number and M is more than or equal to 1.
It should be noted that, by the above method for determining the actual number of times of repeatedly transmitting the control channel, the correlation operation after the blind detection is performed on the control channel on each subframe group of the first subframe interval may be determined. Further, the mth blind test of the control channel in the first interval may be performed in the second to nth subframe intervals. It can be understood that, in each subframe interval, the control channel may be blind-detected on each subframe group, and the scheme of the embodiment of the present invention is adopted to determine the actual number of repeated transmissions.
Furthermore, the method for determining the actual repeated transmission times of the control channel also comprisesThe method can comprise the following steps: sequentially carrying out the Mth blind test of the N-1 th interval on the control channel on the Mth subframe group of the N-1 th subframe interval, wherein the Mth subframe group is a self-starting subframe k M-1 Starting from the N-1 st subframe, repeating the plurality of subframes; if the starting subframe of the Mth subframe group of the Nth subframe interval and the (M-1)/(2) th subframe interval of the Nth subframe interval are within the same subframe interval N-1 ) Starting subframes of the +1 subframe groups are the same, and the Mth DCI in the Nth-1 interval is obtained through the Mth blind detection in the Nth-1 interval, whether the M +1 th interval blind detection result of the control channel in the first interval on the M +1 th subframe group in the N-1 th subframe interval is determined according to the Mth DCI in the N-1 interval and the (M-1)/(2) th interval in the Nth subframe interval N-1 ) (M-1)/(2) nth interval for the control channel on +1 subframe group N-1 ) +1 blind detection result, determining actual repeated sending times; wherein the N-1 sub-frame interval is each sub-frame interval in the N-1 repeated transmission times indication table, the Nth sub-frame interval is each sub-frame interval in the Nth repeated transmission times indication table, and the Mth sub-frame group in the N-1 sub-frame interval is a self-starting sub-frame k M-1 Starting from the Nth sub-frame interval, repeating several sub-frames to the Nth sub-frame interval of (M-1)/(2) N-1 ) The +1 subframe group is a self-start subframe k M-1)/( 2 N-1 ) A plurality of subframes are repeated for N times, wherein N is a positive integer and is greater than 2, and the number of repeated transmission times is increased from the first repeated transmission time to the Nth repeated transmission time; wherein, every time the actual repeated transmission times is judged to be larger than the N-1 repeated transmission times, adding 1 to the value of N.
In the embodiment of the invention, according to the result of the M +1 th blind test in the N-1 th interval and the (M-1)/(2) th interval N-1 ) And determining the actual repeated sending times according to the blind detection result of +1, and continuously judging whether the actual repeated sending times are the Nth repeated times and the (N +1) th repeated times until the actual repeated sending times are accurately judged, so that the accuracy of judging the repeated sending times is improved.
Taking table 1 as an example, if the UE blindly detects DCI only in the subframe interval starting from the unique starting position of the unique rj, it determines that the repetition number of the DCI is rj. E.g., r1 and k in the table b (b∈{13,5, 7)), namely, subframe (subframe) 0 and subframe (subframe)2 and subframe 0 and subframe 4 of radio frame (SFN), and subframe 0 and subframe 6 of radio frame 1 and subframe 2 of radio frame 0, when DCI is analyzed, the number of repetitions of the DCI is determined to be r 1; r2 and k in the same table b The subframe starting from the starting position of (b belongs to {1,3}), namely a radio frame 0 subframe 4 and an infinite frame 1 subframe 2 are analyzed to obtain the DCI, and then the repetition frequency of the DCI is judged to be r 2; r3 and k in the same table b (b belongs to {1}) and the subframe interval from the starting position, namely the subframe interval from the subframe 1 of the infinite frame 1 to the subframe 2 of the infinite frame 1 is analyzed to obtain the DCI, and then the repetition frequency of the DCI is judged to be r 3; in the same way, r4 and k b If DCI is detected blindly in a subframe interval starting from the start position of (b ═ 0), that is, in a subframe interval from subframe 5 of infinite frame 0 to subframe 2 of radio frame 1, the number of repetitions of the DCI is determined to be r 4.
If the UE blindly detects DCI in a subframe interval starting from a common starting position of multiple rjs, the UE needs to determine which rj the DCI belongs to according to the average power of the DCI and the value of the FA. For example, UE at r1 and k b And b is 0, it needs to determine which rj belongs to the DCI according to the average power of the DCI and the value of FA, and j belongs to {1,2,3,4 }.
Referring to fig. 2, fig. 2 is a flowchart of another method for determining an actual number of repeated transmissions of a control channel according to an embodiment of the present invention. The other method for determining the actual number of repeated transmissions of the control channel may include steps S201 to S210, and each step is described below.
It should be noted that, in fig. 2, an example having 4 retransmission number indication tables (i.e. the case shown in table 1) is described, and in a specific implementation, the present invention can also be flexibly applied according to actual situations, and the number of retransmission number indication tables is not limited in the embodiment of the present invention.
In step S201, r1k0 is blindly detected to obtain DCI.
Specifically, the number of repetitions in the table is r1, and k b And (b is 0) carrying out blind detection on the subframe starting from the initial position to obtain the DCI.
In step S202, it is determined whether the FA value of the DCI is greater than a preset FA threshold, if the FA value is greater than the preset FA threshold, step S203 is continuously performed, and if the FA value is less than or equal to the preset FA threshold, step S204 is continuously performed.
In step S203, the DCI is determined to be a dummy check.
In step S204, it is determined whether the repeated transmission number is r1 according to the blind detection results of r1k1 and r2k0, and if the repeated transmission number is r1, the step S205 is continuously performed, and if the repeated transmission number is not r1, the step S206 is continuously performed.
In step S205, the number of repetitions of DCI is determined to be r 1.
It should be noted that, for blind detection of DCI in a subframe interval starting from a starting position common to a plurality of rj, the employed retransmission number indication table corresponds to non-r 1 and k b When the position where b is 0 is analyzed in the DCI, the actual number of repetitions of the DCI may be determined in step S204.
Specifically, the repeated transmission number indication table when employed corresponds to r1 and k b B ∈ {2,6}, and the repetition number of the DCI is determined to be r1 or r 2.
In step S206, it is determined whether the repeated transmission number is r2 according to the blind detection results of r2k1 and r3k0, and if the repeated transmission number is r2, the step S207 is continuously performed, and if the repeated transmission number is not r2, the step S208 is continuously performed.
In step S207, the number of repetitions of DCI is determined to be r 2.
It should be noted that, for blind detection of DCI in a subframe interval starting from a starting position common to a plurality of rj, the employed retransmission number indication table corresponds to non-r 1 and k b When the position where b is 0 is analyzed in the DCI, the actual number of repetitions of the DCI may be determined in step S206.
Specifically, the repeated transmission number indication table when employed corresponds to r1 and k b And b is 4, and the repetition number of the DCI is judged to be r1, r2 or r 3.
In step S208, it is determined whether the number of iterative transmissions is r3 according to the blind test results of r3k1 and r4k0, and if the number of iterative transmissions is r3, the step S209 is continuously performed, and if the number of iterative transmissions is not r3, the step S210 is continuously performed.
In step S209, the number of repetitions of DCI is determined to be r 3.
It should be noted that, for the blind detection of DCI in the sub-frame interval starting from the common starting position of multiple rjs, the employed repeated transmission number indication table corresponds to non-r 1 and k b When the position where b is 0 is analyzed in the DCI, the actual number of repetitions of the DCI may be determined in step S206.
Specifically, the repeated transmission number indication table when employed corresponds to r1 and k b And b is 2, and the repetition frequency of the DCI is judged to be r2 or r 3.
In step S210, the number of repetitions of DCI is determined to be r 4.
In the embodiment, more details about steps S201 to S210 are described with reference to steps S11 to S13 in fig. 1, and are not repeated herein.
Further, the control channel may belong to an eMTC system or an MF system.
In the embodiment of the invention, the actual repetition times of the control channel can be judged according to the blind detection information of the control channel, thereby being beneficial to improving the judgment accuracy and reducing the judgment complexity.
Further, N is less than or equal to 4.
In the embodiment of the invention, N is less than or equal to 4, so that the repeated sending time indication table shown in the table 1 is adopted, the judgment accuracy is improved, and the judgment complexity is reduced. It should be noted that the number of N can also be flexibly set according to practical situations.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an apparatus for determining an actual number of repeated transmissions of a control channel according to an embodiment of the present invention. The determining means of the actual number of repeated transmissions of the control channel may include:
an indication table determining module 31, adapted to determine a plurality of repeated transmission times indication tables, where different repeated transmission times indication tables are used to indicate each subframe interval when different repeated transmission times are used, where the subframe interval refers to a subframe in which a control channel can be detected, and the subframe interval includes a plurality of subframes in which repeated transmission times are used;
a first blind detection module 32, adapted to perform a first interval first blind detection on the control channel on a first subframe group of a first subframe interval with a first repeated transmission time, wherein the first subframe interval is each subframe interval in a first repeated transmission time indication table, and the first subframe group is a first repeated time number of subframes from a starting subframe k 0;
the actual number determining module 33 is adapted to determine whether to determine the actual number of repeated transmissions according to a result of a first-interval second blind detection performed on the control channel on a second subframe group of a first subframe interval and a result of a second-interval first blind detection performed on the control channel on a first subframe group of a second subframe interval when the first interval first blind detection obtains the first interval first DCI, where the second subframe interval is each subframe interval in a second repeated transmission number indication table, the second subframe group of the first subframe interval is a number of subframes with the first number of repeated transmissions from a starting subframe k1, and the first subframe group of the second subframe interval is a number of subframes with the second number of repeated transmissions from a starting subframe k 0.
Wherein the second number of repeated transmissions is greater than the first number of repeated transmissions.
For the principle, specific implementation and beneficial effects of the apparatus for determining the actual number of repeated transmissions of the control channel, please refer to the foregoing and the related descriptions of the method for determining the actual number of repeated transmissions of the control channel shown in fig. 1 to fig. 2, which are not described herein again.
The embodiment of the invention also provides a storage medium, wherein a computer instruction is stored on the storage medium, and when the computer instruction runs, the steps of the method for determining the actual repeated sending times of the control channel are executed. The storage medium may be a computer-readable storage medium, and may include, for example, non-volatile (non-volatile) or non-transitory (non-transitory) memory, and may also include optical disks, mechanical hard disks, solid state hard disks, and so on.
The embodiment of the invention also provides a terminal, which comprises a memory and a processor, wherein the memory is stored with computer instructions capable of running on the processor, and the processor executes the steps of the method for determining the actual repeated sending times of the control channel when running the computer instructions. The terminal includes, but is not limited to, a mobile phone, a computer, a tablet computer and other terminal devices.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected by one skilled in the art without departing from the spirit and scope of the invention, as defined in the appended claims.

Claims (17)

1. A method for determining an actual number of repeated transmissions of a control channel, comprising the steps of:
determining a plurality of repeated transmission times indication tables, wherein different repeated transmission times indication tables are used for indicating each subframe interval when different repeated transmission times are adopted, the subframe interval refers to a subframe capable of detecting a control channel, and the subframe interval comprises a plurality of repeated transmission times of subframes;
performing a first interval first blind test on the control channel on a first subframe group of a first subframe interval, wherein the first subframe interval is each subframe interval in a first repeated transmission time indication table, and the first subframe group is a plurality of subframes of a first repeated time from a starting subframe k 0;
if the first interval first blind test obtains first interval first DCI, determining whether to determine actual repeated transmission times according to a result of a first interval second blind test performed on the control channel on a second subframe group of a first subframe interval and a result of a second interval first blind test performed on the control channel on a first subframe group of a second subframe interval according to the first interval first DCI, wherein the second subframe interval is each subframe interval in a second repeated transmission times indication table, the second subframe group of the first subframe interval is a plurality of subframes with a first repeated time from a starting subframe k1, and the first subframe group of the second subframe interval is a plurality of subframes with a second repeated time from a starting subframe k 0;
wherein the second number of repeated transmissions is greater than the first number of repeated transmissions.
2. The method of claim 1, wherein determining whether to perform the actual retransmission according to the first DCI, the first interval second blind detection on the control channel in the second subframe group of the first subframe interval and the second interval first blind detection on the control channel in the first subframe group of the second subframe interval comprises:
and if the FA value of the first DCI in the first interval is smaller than or equal to a first preset FA threshold, determining the actual repeated transmission times according to the result of the first interval second blind detection on the control channel on a second subframe group in the first subframe interval and the result of the second interval first blind detection on the control channel on the first subframe group in the second subframe interval.
3. The method of claim 2, wherein the first predetermined FA threshold is 0.2 × Len;
and the Len is used for performing hard decision on the soft information input by decoding to obtain the number of non-0 in the second sequence.
4. The method of claim 1, wherein determining the actual number of retransmissions comprises determining the actual number of retransmissions based on a result of a first interval second blind detection performed on the control channel over a second subframe group of a first subframe interval and based on a result of a second interval first blind detection performed on the control channel over the first subframe group of a second subframe interval:
and if the second DCI in the first interval is obtained by the second blind detection in the first interval and the first DCI in the second interval is not obtained by the first blind detection in the second interval, judging that the actual repeated transmission times are the first repeated transmission times.
5. The method of claim 1, wherein determining the actual number of retransmissions comprises determining the actual number of retransmissions based on a result of a second interval second blind detection performed on the control channel over a second group of subframes of a first subframe interval and based on a result of a second interval first blind detection performed on the control channel over a first group of subframes of a second subframe interval:
and if the second DCI in the first interval is obtained by the second blind detection in the first interval and the first DCI in the second interval is obtained by the first blind detection in the second interval, judging that the actual repeated transmission times are greater than the first repeated transmission times.
6. The method of claim 1, wherein determining the actual number of retransmissions comprises determining the actual number of retransmissions based on a result of a first interval second blind detection performed on the control channel over a second subframe group of a first subframe interval and based on a result of a second interval first blind detection performed on the control channel over the first subframe group of a second subframe interval:
and if the first interval second DCI is not obtained by the first interval second blind detection and the second interval first DCI is obtained by the second interval first blind detection, determining the actual repeated transmission times at least according to the first average power of the first interval second DCI and the second average power of the second interval first DCI.
7. The method of claim 6, wherein determining the actual number of repeated transmissions according to at least a first average power of the first section second DCI and a second average power of the second section first DCI comprises:
if the quotient of the first average power and the second average power is larger than a preset power threshold value, judging that the actual repeated sending times are the first repeated sending times;
and if the quotient of the first average power and the second average power is less than or equal to the preset power threshold, determining the actual repeated transmission times according to the FA value of the first DCI in the first interval and the FA value of the first DCI in the second interval.
8. The method of claim 7, wherein the predetermined power threshold is 10.
9. The method of claim 7, wherein determining the actual number of repeated transmissions according to the FA value of the first-section first DCI and the FA value of the second-section first DCI comprises:
if the difference value between the FA value of the first DCI in the first interval and the FA value of the first DCI in the second interval is larger than a second preset FA threshold value, judging that the actual repeated transmission times are the first repeated transmission times;
and if the difference value between the FA value of the first DCI in the first interval and the FA value of the first DCI in the second interval is smaller than or equal to a second preset FA threshold, judging that the actual repeated transmission times are larger than the first repeated transmission times.
10. The method of claim 9, wherein the second predetermined FA threshold is 0.2 × Len × 0.3;
and the Len is used for performing hard decision on the soft information input by decoding to obtain the number of non-0 in the second sequence.
11. The method for determining the actual number of repeated transmissions of the control channel according to claim 5 or 9, further comprising:
performing a first interval Mth blind detection on the control channel on an Mth subframe group of the first subframe interval, wherein the Mth subframe group is in the first subframe intervalM subframe groups are self-starting subframes k M-1 A first number of repeated subframes; if the starting subframe of the mth subframe group of the first subframe section is the same as the starting subframe of the ((M-1)/2+1) th subframe group of the second subframe section and the mth blind detection of the first section obtains mth DCI, determining whether to determine the actual number of repeated transmissions according to the result of the mth +1 th blind detection of the first section for the control channel on the mth +1 th subframe group of the first subframe section and the result of the ((M-1)/2+1) th blind detection of the second section for the control channel on the ((M-1)/2+1) th subframe group of the second subframe section according to the mth DCI of the first section; wherein M is an odd number and M is more than or equal to 1.
12. The method of claim 11, further comprising:
sequentially carrying out the Mth blind test of the Nth-1 interval on the control channel on the Mth subframe group of the Nth-1 subframe interval, wherein the Mth subframe group is a self-starting subframe k M-1 Starting from the N-1 st subframe, repeating the plurality of subframes;
if the starting subframe of the Mth subframe group of the Nth subframe interval and the (M-1)/(2) th subframe interval of the Nth subframe interval are within the same subframe interval N -1 ) Starting subframes of the +1 subframe groups are the same, and the Mth DCI in the Nth-1 interval is obtained through the Mth blind detection in the Nth-1 interval, whether the M +1 th interval blind detection result of the control channel in the N-1 th interval on the M +1 th subframe group in the N-1 th subframe interval is determined according to the Mth DCI in the N-1 th interval and the (M-1)/(2) th subframe in the Nth subframe interval N-1 ) (M-1)/(2) nth interval for the control channel on +1 subframe group N-1 ) +1 blind detection result, determining actual repeated sending times;
the N-1 sub-frame interval is each sub-frame interval in the N-1 repeated transmission times indication table, the N sub-frame interval is each sub-frame interval in the N repeated transmission times indication table, and the Mth sub-frame group of the N-1 sub-frame interval is a self-starting sub-frame k M-1 Starting from the Nth sub-frame interval of (M-1)/(2) by repeating the number of sub-frames N-1 ) +1 sonFrame set is self-starting subframe k M-1/( 2 N-1 ) An Nth repeated sub-frame, wherein N is a positive integer and is greater than 2, and the number of times from the first repeated transmission to the Nth repeated transmission is increased in sequence;
wherein, every time the actual repeated transmission times is judged to be larger than the N-1 repeated transmission times, adding 1 to the value of N.
13. The method of claim 1, wherein the control channel belongs to an eMTC system or an MF system.
14. The method of claim 1, wherein N ≦ 4;
wherein N is used to indicate the number of the repeated transmission number indication table.
15. An apparatus for determining an actual number of repeated transmissions of a control channel, comprising:
an indication table determining module, adapted to determine multiple repeated transmission times indication tables, where different repeated transmission times indication tables are used to indicate each subframe interval when different repeated transmission times are adopted, where a subframe interval refers to a subframe in which a control channel can be detected, and the subframe interval includes multiple repeated transmission times subframes;
a first blind detection module, adapted to perform a first interval first blind detection on the control channel on a first subframe group of a first subframe interval with a first repeated transmission number, wherein the first subframe interval is each subframe interval in a first repeated transmission number indication table, and the first subframe group is a first repeated number of subframes from a starting subframe k 0;
an actual number determining module, adapted to determine whether to determine an actual number of repeated transmissions according to a result of a first-interval second blind detection performed on the control channel on a second subframe group of a first subframe interval and a result of a second-interval first blind detection performed on the control channel on a first subframe group of a second subframe interval when the first interval first blind detection obtains first interval first DCI, where the second subframe interval is each subframe interval in a second repeated transmission number indication table, the second subframe group of the first subframe interval is a first repeated number of subframes from a starting subframe k1, and the first subframe group of the second subframe interval is a second repeated number of subframes from a starting subframe k 0;
wherein the second number of repeated transmissions is greater than the first number of repeated transmissions.
16. A storage medium having stored thereon computer instructions, wherein said computer instructions are operable to perform the steps of the method for determining the actual number of repeated transmissions of a control channel according to any of claims 1 to 14.
17. A terminal comprising a memory and a processor, said memory having stored thereon computer instructions executable on said processor, wherein said processor when executing said computer instructions performs the steps of the method for determining the actual number of repeated transmissions of a control channel according to any of claims 1 to 14.
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