WO2019158013A1

WO2019158013A1 - Channel transmission method and apparatus, network device, and computer readable storage medium

Info

Publication number: WO2019158013A1
Application number: PCT/CN2019/074654
Authority: WO
Inventors: 石靖; 夏树强; 韩祥辉; 任敏; 林伟
Original assignee: 中兴通讯股份有限公司
Priority date: 2018-02-13
Filing date: 2019-02-02
Publication date: 2019-08-22
Also published as: CN110149661B; CN110149661A

Abstract

Provided in an embodiment of the present application are a channel transmission method and apparatus, a network device, and a computer readable storage medium: determining the transmission granularity of channel transmission, and repeatedly transmitting data on a channel on the basis of the transmission granularity.

Description

Channel transmission method and device, network device and computer readable storage medium

The present application claims the priority of the Chinese Patent Application No. 20110115022, filed on Jan. 13, 2018, the entire disclosure of which is hereby incorporated by reference.

Technical field

The embodiments of the present application relate to the field of communications, for example, to a channel transmission method and apparatus, a network device, and a computer readable storage medium.

Background technique

Currently 4th Generation Mobile Communication Technology (LTE), Long-Term Evolution (LTE-Advanced) The demand for communication technology (5G, 5th Generation mobile communication technology) is increasing. From the current development trend, both 4G and 5G systems are studying features that support enhanced mobile broadband, ultra-high reliability, ultra-low latency transmission, and massive connectivity.

In order to support the characteristics of ultra-high reliability and ultra-low latency transmission, it is necessary to transmit low-latency and high-reliability services in a repetitive transmission manner with a short transmission time interval, and the shortest to single OFDM (Orthogonal Frequency Division Multiplexing) Use) symbol. At the same time, other length transmission time intervals can also be used, with multiple OFDM symbols, so it is necessary to determine how to perform repeated transmission when using a shorter transmission interval.

Summary of the invention

The embodiments of the present application provide a channel transmission method and apparatus, a network device, and a computer readable storage medium, which can solve the problem in the related art that a scheme for repeatedly transmitting using a short transmission interval is lacking.

The embodiment of the present application provides a channel transmission method, including:

Determine the granularity of the transmission used in channel transmission;

Repeated transmission of data is performed on the channel based on the transmission granularity.

The embodiment of the present application further provides a channel transmission apparatus, including:

a granularity confirmation module, configured to determine a transmission granularity used in channel transmission;

A data transmission module is arranged to perform repeated transmission of data on the channel based on the transmission granularity.

The embodiment of the present application further provides a network device, including a first processor, a memory, and a communication bus;

The communication bus is configured to implement connection communication between the processor and the memory;

The processor is arranged to execute a computer program stored in the memory to implement the steps of the channel transmission method described above.

The embodiment of the present application further provides a computer readable storage medium, where the computer readable storage medium stores one or more computer programs, and the computer program can be executed by one or more processors to implement the channel transmission method described above. step.

Other features and corresponding advantageous effects of the embodiments of the present application are set forth in the remainder of the specification.

DRAWINGS

FIG. 1 is a flowchart of a channel sending method according to a first embodiment of the present application;

2 is a schematic diagram of a downlink short transmission time interval pattern provided by multiple embodiments of the present application;

3 is a schematic diagram of an uplink short transmission time interval pattern provided by multiple embodiments of the present application;

4 is a schematic diagram of repeated transmission between search spaces in different time domains of the same control resource set according to the seventh embodiment of the present application;

FIG. 5 is a schematic diagram of repeated transmission between search spaces in different time domains of the same control resource set according to the seventh embodiment of the present disclosure;

FIG. 6 is a schematic diagram of repeated transmission between search spaces in different time domains of different control resource sets according to the seventh embodiment of the present disclosure;

FIG. 7 is a schematic diagram of repeated transmission between search spaces in the same time domain of different control resource sets according to the seventh embodiment of the present disclosure;

FIG. 8 is a schematic diagram of a search space for determining repeated transmission use according to a seventh embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of a channel sending apparatus according to a ninth embodiment of the present application;

FIG. 10 is a schematic structural diagram of a network device according to a tenth embodiment of the present disclosure.

Detailed ways

First embodiment

Please refer to FIG. 1. FIG. 1 is a flowchart of a channel transmission method according to a first embodiment of the present application, including: S110-S120.

In S110, the transmission granularity used in channel transmission is determined.

In S120, repeated transmission of data is performed on the channel based on the transmission granularity.

With the present embodiment, after determining the transmission granularity of the channel, repeated transmission of data is performed on the channel, thereby providing a possibility for transmission of a smaller granularity, and repeated transmission using a short transmission interval can be realized.

In an embodiment, the transmission granularity may include at least one of: orthogonal frequency division multiplexing (OFDM) symbols, short transmission time intervals (sTTIs), search spaces, time slots, Microslots and candidate sets. The transmission granularity refers to the unit size of data repeatedly transmitted on the channel, and the OFDM symbol is used as the transmission granularity, indicating that the repetition of the data can be to the extent of the OFDM symbol size, and the sTTI is the transmission granularity, indicating that the data can be repeated to a given The extent of the size of the sTTI. The size of the sTTI may be arbitrarily given. Generally, the sTTI contains fewer OFDM symbols, for example, no more than 7 OFDM symbols. Wherein, one slot may include 14 OFDM symbols, and one minislot may include 2, 4 or 7 OFDM symbols.

In an embodiment, when the transmission granularity of the data to be transmitted on the channel to be transmitted includes an OFDM symbol, the method for determining the number of repeated transmissions may be any one of the following:

The number of repeated transmissions is the number of OFDM symbols included in one sTTI;

Dynamically indicating the number of repeated transmissions by using downlink control information;

Configure the number of repeated transmissions through high layer signaling.

In an embodiment, the number of repeated transmissions may include at least one of the values in the set {1, 2, 3}.

In an embodiment, when the transmission granularity includes sTTI, the method for determining the number of repeated transmissions may be any one of the following:

Configure the number of repeated transmissions through high layer signaling.

In an embodiment, the number of repeated transmissions may include at least one of the values in the set {1, 2, 3, 6}.

In an embodiment, when the transmission granularity includes an OFDM symbol and an sTTI, the number of repeated transmissions may be in units of OFDM symbols or sTTI.

In an embodiment, when the number of repeated transmissions is in units of OFDM symbols, the method of determining the number of repeated transmissions may be any one of the following:

The number of repeated transmissions is the number of OFDM symbols included in at least one sTTI;

Configure the number of repeated transmissions through high layer signaling.

In an embodiment, the number of repeated transmissions may include at least one of the values of the set {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14}.

In an embodiment, when the number of repeated transmissions is in units of sTTI, the number of repeated transmissions may include at least one of the values in the set {1, 2, 3, 6}, or the set {1, 2, 3, 4, 6 , at least one of the values in 8}.

In an embodiment, performing the repeated transmission of data on the channel further comprises: repeating the transmission may align at least one of the following boundaries: an sTTI boundary, a slot boundary, and a subframe boundary.

In an embodiment, the redundancy version pattern (RV pattern) length of the repeated transmission may be equal to the number of repeated transmissions.

In an embodiment, the manner of determining the repeatedly transmitted RV pattern may include any one of the following:

Using RV pattern based on OFDM symbols in sTTI, repeating with sTTI as a period;

RV pattern is used cyclically based on OFDM symbols;

The same RV is used for multiple OFDM symbols within the same sTTI, and the RV pattern is used between different sTTIs.

In an embodiment, when the repeated transmission of data is performed on the channel, when the repeated transmission is based on OFDM symbol repetition within a single sTTI, and the number of repetitions is equal to the number of OFDM symbols included in the sTTI, pilot sharing is supported in the sTTI.

In an embodiment, when data is repeatedly transmitted on a channel, when repeated transmissions are repeatedly transmitted between multiple sTTIs, and no frequency hopping is performed within the sTTI, and OFDM is only hopped between sTTIs, OFDM symbols within the sTTI may be used. Pilot sharing;

When repeated transmissions are repeatedly transmitted between multiple sTTIs and hopped within the sTTI, and no hopping between sTTIs, the pilots of OFDM symbols located in different frequency domain positions in the first sTTI may be shared to the same frequency domain in other sTTIs. Position of the OFDM symbol.

In an embodiment, when the channel is a short physical downlink service channel (SPDSCH), the uplink control channel for which the Hybrid Automatic Repeat Request-Acknowledgement (Hybrid Automatic Repeat Request-Acknowledgement) is fed is a single OFDM symbol transmission.

In an embodiment, under the preset feedback timing condition, the time domain position of the uplink control channel in the subframe is a preset 6 OFDM positions.

In an embodiment, the uplink control channel is a short physical uplink control channel sPUCCH (short Physical Uplink Control CHannel);

When the sPUCCH transmitted by using the single OFDM symbol collides with the short physical uplink shared channel sPUSCH (short physical uplink shared channel), the sPUCCH is transmitted on the conflicting OFDM symbol, and the sPUSCH is transmitted on the remaining OFDM symbols;

When the sPUCCH transmitted using the single OFDM symbol collides with the sPUCCH transmitted by the sTTI, the sPUCCH transmitted using the single OFDM symbol is transmitted on the conflicting OFDM symbol, and the sPUCCH transmitted by the sTTI is transmitted on the non-conflicting OFDM symbol.

In an embodiment, when the sPUCCH transmitted using the single OFDM symbol collides with the sPUCCH transmitted by the sTTI, the SPUCCH transmitted using the single OFDM symbol is transmitted, and the sPUCCH transmitted by the sTTI is discarded or stopped.

In an embodiment, when sPUCCH based on single OFDM symbol transmission is used, collision with sPUCCH based on sTTI transmission is used, and at most 1 bit (bit) of HARQ-ACK in sPUCCH based on sTTI transmission needs to be placed in single OFDM symbol transmission. When transmitting in the sPUCCH, the HARQ-ACK in the sPUCCH based on the sTTI transmission is reserved, and the HARQ-ACK of the sPUCCH transmitted using the single OFDM symbol is discarded or stopped.

In an embodiment, the channel is a downlink control channel, and when the transmission granularity includes at least one of a search space (SS) and a candidate set, the RRC configuration through the predefined, radio resource control, the DCI indication of the downlink control information, and the priority rule. At least one of them determines that the repeat transmission method is at least one of the following:

Method 1: repeating a repetition between multiple search spaces at different times of the same control-resource set (Coreset);

Mode 2: Repetition between the same search space at different times of the same Coreset;

Mode 3: Repetition between multiple search spaces at different times in different Coresets;

Mode 4: Repetition between multiple search spaces at the same time in different Coresets;

Mode 5: Repetition between multiple candidate sets (candidate sets) in the search space at the same time in the same Coreset;

Mode 6: Repetition between multiple search spaces at the same time in the same Coreset;

Method 7: determining a user equipment specific search space index (USS ID) and a sequence of repeated transmissions;

Mode 8: determining the order of different starting positions of the same USS ID for repeated transmission;

Mode 9: Repetition in the ID order in all configured USS.

In an embodiment, when at least one of the

modes

1, 2, 3, 4, and 6 is used for repeated transmission, only one candidate set is used at one time of one search space when the transmission is repeated; or, the mode 2 is used. When at least one of 4, 6 is repeatedly transmitted, a plurality of candidate sets are used at one time in one search space at the time of repeated transmission.

In an embodiment, the priority rule includes at least one of the following:

When using the configured maximum aggregation level, use mode 2;

When using the configured non-maximum aggregation level, use mode 5;

When using the configured maximum aggregation level, use mode 4;

When configuring a Coreset, use mode 2 or mode 5;

When configuring 1 search space, use mode 2 or mode 5;

In the same type of search space configured, use mode 5;

In the same type of search space configured, use mode 2;

In the same type of search space configured, use mode 4.

In an embodiment, when the transmission granularity includes a time slot or a minislot, the search space used for the repeated transmission is equal to the duration of the lifetime of the Coreset multiplied by the number of repetitions or the maximum number of repetitions.

In an embodiment, when the transmission granularity includes at least one of a candidate set, an sTTI, an OFDM symbol, and a search space, determining, by using at least one of a predefined, an RRC configuration, a DCI indication, and a priority rule, that the repeated transmission manner includes the following at least one of One:

Mode 1: Repetition in different search spaces between different sTTIs, and the search space time domain length is within 1 sTTI;

Mode 2: Repetition between different candidate sets in the same search space in the same sTTI;

Mode 3: Repetition between different search spaces within the same sTTI;

Mode 4: Repetition in the same search space between different sTTIs, and the search space time domain length is equal to R sTTIs, where R represents the number of repetitions or the maximum number of repetitions;

Mode 5: Repeat transmission based on OFDM symbols in the sTTI, where the non-first OFDM is repeatedly transmitted in the sTTI when the single symbol is based on the CRS-based short physical downlink control channel (sPDCCH) of the cell reference signal A single-symbol CRS-based sPDCCH is introduced in the symbol; when the two-symbol CRS-based sPDCCH is configured, the repeated transmission uses one candidate set in the first two symbols in the sTTI, and the single symbol CRS is introduced in the third symbol. Based sPDCCH.

In an embodiment, the priority rule includes at least one of the following:

When configuring one physical resource block set (PRB set), use mode 2;

When two PRB sets are configured, mode 3 is used, and only one candidate set is used in each search space;

When using the configured maximum aggregation level, use mode 1;

When using the configured non-maximum aggregation level, use mode 2;

Fixed use mode 4;

Fixed use mode 1.

Through the implementation of the embodiment, repeated transmission of data in a short transmission time interval can be realized, and in addition to obtaining the time-domain energy accumulation gain of the repeated transmission, the coding gain and the frequency domain diversity gain brought by transmitting different redundancy versions can also be obtained. Etc., so that the URLLC (Ultra-Reliable and Low Latency Communications) requirements are implemented with fewer repetitions, and the system spectrum efficiency is improved.

Second embodiment

This embodiment provides a data repetition sending method in which the transmission granularity is a short transmission interval sTTI.

The base station scheduling terminal repeatedly transmits downlink data in multiple transmission time intervals (TTIs), and uses the sPDSCH channel. In an embodiment, the TTI contains fewer OFDM symbols, such as no more than 7 OFDM symbols. This embodiment is described in the short TTI structure of the LTE system, that is, the TTI is a short TTI (short TTI, sTTI for short), but is not limited thereto. The DL short TTI frame structure is as shown in FIG. 2, and includes 6 DL (Down Link) short TTIs in a 1 ms subframe. When the sPDSCH is configured to start from OFDM symbol #1 or #3, the pattern Pattern1 is used; when sPDSCH When configured to start from OFDM symbol #2, use Pattern2. Note that the OFDM symbol number here starts from 0, that is, there are 14 OFDM symbols in the 1 ms subframe, and the sequence numbers are #0 to #13.

Or the base station scheduling terminal repeatedly transmits and transmits uplink data in multiple transmission time intervals (TTIs), and uses the sPUSCH channel. In an embodiment, the TTI contains fewer OFDM symbols, such as no more than 7 OFDM symbols. This embodiment is described in the short TTI structure in the LTE system, but is not limited thereto. The UL short TTI frame structure is as shown in FIG. 3, and includes 6 UL (Up Link) short TTIs in a 1 ms subframe. Note that the OFDM symbol number here starts from 0, that is, there are 14 OFDM symbols in the 1 ms subframe, and the sequence numbers are #0 to #13.

Wherein, when the sPDSCH or the sPUSCH is repeatedly transmitted based on the short transmission time interval, the number of repeated transmissions includes at least one of the values in the set {1, 2, 3, 6}. The method of determining the number of repetitions is: dynamic indication by downlink control information, or configuration by high layer signaling. Repeat transmission can start from any sTTI. When the number of repetitions is 1, it is the same as the single sTTI scheduling. When the number of repetitions is 2, two sTTIs are continuously transmitted from the scheduled sTTI. When the number of repetitions is 3, three sTTIs are continuously transmitted from the scheduled sTTI. When the number of repetitions is 6, that is, six sTTIs are continuously transmitted from the scheduled sTTI. Or the number of repeated transmissions includes at least one of the sets {1, 2, 3, 4, 6, 8}.

In an embodiment, at least one of the aligned slot boundaries and the subframe boundaries is repeatedly transmitted. When the number of repetitions is 3, it can start from sTTI#0 or sTTI#3. In an embodiment, when the number of repetitions is 6, it may start from sTTI#0.

In an embodiment, frequency hopping between each sTTI, ie sTTI hopping, is supported when the transmission is repeated. Or only hop 1 time, for the number of repetitions is k, in the first

sTTI and

Frequency hopping between sTTIs. When frequency hopping, frequency hopping is performed according to the configured or indicated offset, where k is greater than or equal to 1.

In an embodiment, when the transmission is repeated, the manner of determining the redundancy version pattern RV (Redundancy Version) pattern includes at least one of the following: (1) the RV pattern is defined separately for different repetition times k, for example, for the number of repetitions k= 2, RV pattern uses {0, 0} or {0, 3}, when the number of repetitions is k = 3, RV pattern uses {0, 0, 0} or {0, 3, 0} or {0, 2, 3} . (2) The RV pattern is cyclically used in the order of {RV1, RV2, RV3, RV4} preset or configured or indicated, which may be {RV1, RV2, RV3, RV4}={0,0,0,0} or { 0, 2, 3, 1} or {0, 3, 0, 3}, when the number of repetitions k = 2, use {RV1, RV2}, when the number of repetitions k = 3, use {RV1, RV2, RV3} When the number of repetitions k=6, {RV1, RV2, RV3, RV4, RV1, RV2} are used. (3) RV pattern can be {0,0,0,0} or {0,2,3,1} or {0,3,0,3}, and can be used when the number of repetitions k mod 2=0 , 0,0,0} or {0,3,0,3}, can use {0,0,0,0} when the number of repetitions k mod 3=0, can be used when the number of repetitions k mod 4=0 {0,0,0,0} or {0,2,3,1} or {0,3,0,3}, when the number of repetitions k mod 6=0 can be used {0,0,0,0} Or {0,3,0,3}. For example, when the number of repetitions is k=2, {0, 0} or {0, 3} can be used; when the number of repetitions is 3, {0, 0, 0} can be used; when the number of repetitions is k=6, Use {0,0,0,0,0,0} or {0,3,0,3,0,3}.

In an embodiment, different sTTIs use different modulation and coding strategies MCS (Modulation and Coding Scheme) levels when repeating transmissions. For example, the MCS level is decremented by sTTI. That is, the MCS used by sTTI x is not larger than the MCS used by sTTI y, MCS(sTTI x) ≤ MCS(sTTI y), where sTTI x is later than sTTI y from the time domain. In an embodiment, when the DCI indicates that MCS1 is used in the first sTTI for repeated transmission, the MCS level used in the subsequent sTTI is obtained according to the predefined or configured or indicated offset. If offset=2, the first sTTI is based on DCI ( Downlink Control Information, indicating that MCS index #5 is used, the second sTTI is used to repeat MCS index #3.

In an embodiment, when the transmission is repeated, different sTTIs use the same MCS but use different frequency domain resource sizes, that is, the number of RBs (Radio Bearers) used in the frequency domain is not the same. For example, the number of RBs used is incremented by sTTI. That is, the number of RBs used by sTTI x is not greater than the number of RBs used by sTTI y, where sTTI x is earlier than sTTI y from the time domain. In an embodiment, when the DCI indicates the number and location of the RBs used in the first sTTI of the repeated transmission, the number of RBs used in the subsequent sTTI is obtained according to the predefined or configured or indicated offset in the frequency domain mirroring, assuming offset=10, The system bandwidth includes 50 RBs. If RB#0-19 is used according to the DCI indication in the first sTTI, the second sTTI uses RB#0-19 and RB#40-49 and repeats RB#0- when repeating 2 transmissions. The data in 9.

With the channel transmission method of this embodiment, in addition to obtaining the repeated transmission time domain energy accumulation gain, the coding gain, the frequency domain diversity gain, and the like brought by transmitting different redundancy versions can also be obtained. This enables URLLC requirements with fewer repetitions and improves system spectral efficiency.

Third embodiment

The base station scheduling terminal repeatedly transmits downlink data in a single transmission time interval (TTI) with an OFDM symbol (abbreviated as OS, OFDM symbol), and uses the sPDSCH channel. In an embodiment, the TTI contains fewer OFDM symbols, such as no more than 7 OFDM symbols. This embodiment is described by the short TTI structure in the LTE system, that is, the TTI is a short TTI (short TTI, abbreviated as sTTI). The DL short TTI frame structure is as shown in FIG. 2, and includes 6 DL (Down Link) short TTIs in a 1 ms subframe. When sPDSCH is configured to start from OFDM symbol #1 or #3, Pattern1 is used; when sPDSCH is When configured to start from OFDM symbol #2, use Pattern2. Note that the OFDM symbol number here starts from 0, that is, there are 14 OFDM symbols in the 1 ms subframe, and the sequence numbers are #0 to #13.

Or the base station scheduling terminal repeatedly transmits and transmits uplink data in a single transmission time interval (TTI) with granularity of OFDM symbols, and uses an sPUSCH channel. In an embodiment, the TTI contains fewer OFDM symbols, such as no more than 7 OFDM symbols. This embodiment is described in the short TTI structure in the LTE system, but is not limited thereto. The UL short TTI frame structure is as shown in FIG. 3, and includes 6 UL (Up Link) short TTIs in a 1 ms subframe. Note that the OFDM symbol number here starts from 0, that is, there are 14 OFDM symbols in the 1 ms subframe, and the sequence numbers are #0 to #13.

Wherein, when the sPDSCH or the sPUSCH is repeatedly transmitted based on the OFDM symbol, the number of repeated transmissions includes at least one of the values in the set {1, 2, 3}. The number of repetitions is determined by the number of OFDM symbols included in one sTTI, or dynamically indicated by downlink control information, or configured by higher layer signaling. Repeat transmission can start from the start symbol of any sTTI. When the number of repetitions is 1, the last symbol in the sTTI, or the first symbol in the sTTI, or the indication/configuration is 1. When the number of repetitions is 2, the number of OFDM symbols included in the sTTI where the repeated transmission is located is 2, or the indication/configuration is 2. When the number of repetitions is 3, the number of OFDM symbols included in the sTTI where the repeated transmission is located is 3, or the indication/configuration is 3. In an embodiment, the repeated transmission alignment sTTI boundaries.

In an embodiment, frequency hopping between each OFDM, ie, symbol-by-symbol hopping, is supported when the transmission is repeated. Or only hop 1 time, for the number of repetitions is k, in the first

OFDM symbols and

Frequency hopping between OFDM symbols. When frequency hopping, frequency hopping is performed according to the configured or indicated offset, where k is greater than or equal to 1.

In an embodiment, when the transmission is repeated, the manner of determining the RV pattern includes at least one of the following: (1) the length of the RV pattern is equal to the number of repetitions, for example, for the number of repetitions k=2, the RV pattern adopts {0, 0} or { 0, 3}, when the number of repetitions is k=3, the RV pattern uses {0, 0, 0} or {0, 3, 0} or {0, 2, 3}. (2) The length of the RV pattern is 2, such as {RV1, RV2}={0,0} or {0,3}. If the sTTI contains 3 symbols, the 3rd symbol and the second symbol use the same RV, such as {RV1, RV2, RV3}={RV1, RV2, RV2}={0,0,0} or {0,3,3}. (3) It is cyclically used in the order of {RV1, RV2, RV3, RV4} according to the preset or configuration or indication, which may be {RV1, RV2, RV3, RV4}={0,0,0,0} or {0, 2, 3, 1} or {0, 3, 0, 3}, when the number of repetitions is k = 2, {RV1, RV2} is used, and when the number of repetitions is k = 3, {RV1, RV2, RV3} is used. (4) The RV pattern can be {0,0,0,0} or {0,2,3,1} or {0,3,0,3}, and can be used when the number of repetitions k mod 2=0 , 0,0,0} or {0,3,0,3}, when the number of repetitions k mod 3=0, {0,0,0,0} can be used. For example, when the number of repetitions is k=2, {0, 0} or {0, 3} may be used; when the number of repetitions is 3, {0, 0, 0} may be used.

In an embodiment, different OFDM symbols use different MCS levels when repeating transmissions. For example, the MCS level is decremented symbol by symbol. That is, the MCS used by the symbol x is not larger than the MCS used by the symbol y, MCS(OS x) ≤ MCS(OS y), where OS x is later than OS y from the time domain. In an embodiment, when MCI1 is used in the first symbol of the DCI to be repeatedly transmitted, the MCS level used in the subsequent OFDM is obtained according to the predefined or configured or indicated offset, and if offset=2, the first OFDM symbol is based on DCI. Instructing to use MCS index #5, the second OFDM symbol is used to repeat MCS index #3.

In an embodiment, when repeating transmission, different OFDM symbols use the same MCS but use different frequency domain resource sizes, that is, the number of RBs used in the frequency domain is not all the same. For example, the number of RBs used is incremented by sign. That is, the number of RBs used by OS x is not greater than the number of RBs used by OS y, where OS x is earlier than OS y from the time domain. In an embodiment, when the DCI indicates the number and location of the RBs used in the first symbol of the repeated transmission, the number of RBs used in the subsequent symbols is obtained by repeating the frequency domain mirroring according to the predefined or configured or indicated offset, assuming offset=10, The system bandwidth includes 50 RBs. If RB#0-19 is used according to the DCI indication in the first symbol, the second symbol is repeated using RB#0-19 and RB#40-49 and repeating RB#0- The data in 9.

With the channel repetition transmission method provided in this embodiment, it is possible to obtain the coding gain, the frequency domain diversity gain, and the like brought by transmitting different redundancy versions in addition to obtaining the time domain energy accumulation gain based on the OFDM symbol repeated transmission in the short TTI. This enables URLLC requirements with fewer repetitions and improves system spectral efficiency.

Fourth embodiment

The base station scheduling terminal repeatedly transmits downlink data based on OFDM symbols between multiple transmission time intervals (TTIs) and within the TTI, using the sPDSCH channel. In an embodiment, the TTI contains fewer OFDM symbols, such as no more than 7 OFDM symbols. This embodiment is described in the short TTI structure of the LTE system, that is, the TTI is a short TTI (short TTI, sTTI for short), but is not limited thereto. The DL short TTI frame structure is as shown in FIG. 2, and includes 6 DL (Down Link) short TTIs in a 1 ms subframe. When sPDSCH is configured to start from OFDM symbol #1 or #3, Pattern1 is used; when sPDSCH is When configured to start from OFDM symbol #2, use Pattern2. Note that the OFDM symbol number here starts from 0, that is, there are 14 OFDM symbols in the 1 ms subframe, and the sequence numbers are #0 to #13.

Or the base station scheduling terminal transmits uplink data based on OFDM symbol repeated transmission between multiple transmission time intervals (TTIs) and within the TTI, and uses an sPUSCH channel. In an embodiment, the TTI contains fewer OFDM symbols, such as no more than 7 OFDM symbols. This embodiment is described in the short TTI structure in the LTE system, but is not limited thereto. The UL short TTI frame structure is as shown in FIG. 3, and includes 6 UL (Up Link) short TTIs in a 1 ms subframe. Note that the OFDM symbol number here starts from 0, that is, there are 14 OFDM symbols in the 1 ms subframe, and the sequence numbers are #0 to #13.

Wherein, when the sPDSCH or the sPUSCH is repeatedly transmitted between the sTTI and the sTTI based on the OFDM symbol, the number of repeated transmissions includes the set {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, At least one of the values in 14} and the unit is an OFDM symbol, or the number of repeated transmissions includes at least one of the values in the set {1, 2, 3, 6} and the unit is sTTI, or the number of repeated transmissions includes a set {1, 2 , 3, 4, 6, 8} takes at least one of the values and the unit is sTTI.

When the number of repetitions is sTTI, the number of repetitions is determined by dynamic indication of downlink control information or by higher layer signaling. Repeat transmissions can start from any sTTI, or repeated transmissions can start from any symbol. For example, when the number of repetitions is 1, it is the same as the single sTTI scheduling; when the number of repetitions is 2, that is, two sTTIs are continuously transmitted from the scheduled sTTI; when the number of repetitions is three, that is, three sTTIs are continuously transmitted from the scheduled sTTI; When the number of repetitions is 6, that is, 6 sTTIs are continuously transmitted from the scheduled sTTI; or the number of repeated transmissions includes at least one of the sets {1, 2, 3, 4, 6, 8}.

When the repetition number unit is an OFDM symbol, the number of repeated transmissions includes at least one of the values in the set {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14}. The method for determining the number of repetitions is: equal to the number of OFDM symbols included in one or more sTTIs, either dynamically indicated by downlink control information or configured by higher layer signaling. Repeated transmissions can start with the start symbol of any sTTI or start with any symbol. For example, when the number of repetitions is 1, the last symbol in the sTTI, or the first symbol in the sTTI, or the indication/configuration is 1. When the number of repetitions is 2, the number of OFDM symbols included in the sTTI where the repeated transmission is located is 2, or the indication/configuration is 2. When the number of repetitions is 3, the number of OFDM symbols included in the sTTI where the repeated transmission is located is 3, or the indication/configuration is 3.

In an embodiment, the at least one of the aligned sTTI boundary, the slot boundary, and the subframe boundary is repeatedly transmitted. When the number of repeated transmissions is in sTTI, when the number of repetitions is 3, it can only start from sTTI#0 or sTTI#3. In an embodiment, when the number of repetitions is 6, it can only start from sTTI#0.

In an embodiment, the frequency hopping between sTTI and the frequency hopping in sTTI may be selected one by one, and only one type is configured. In an embodiment, when the number of repeated transmissions is in units of sTTI, frequency hopping between each sTTI is supported, that is, frequency hopping by sTTI. Or only hop 1 time, for the number of repetitions is k, in the first

sTTI and

Frequency hopping between sTTIs. When frequency hopping, frequency hopping is performed according to the configured or indicated offset. When the number of repeated transmissions is in units of OFDM symbols, frequency hopping between each OFDM is supported, that is, symbol-by-symbol frequency hopping. Or only hop 1 time, for the number of repetitions is k, in the first

OFDM symbols and

Frequency hopping between OFDM symbols. When hopping, frequency hopping is performed according to the configured or indicated offset, where k is equal to 1.

In an embodiment, when the transmission is repeated, the manner of determining the RV pattern includes at least one of the following: (1) the RV pattern is repeated in a period of sTTI, that is, the RV pattern is used in the sTTI, and the same RV pattern is used between the sTTIs. In an embodiment, sTTI#n+1 uses RV cycling the same as used in sTTI#n, for example {0, 2} is used in the first sTTI, and {0, 2} is used in the second sTTI. Or in an embodiment, the {RV1, RV2, RV3, RV4} of the predefined or higher layer configuration is used sequentially, for example, {0, 0, 0, 0} or {0, 2, 3, 1} or {0, 3,0,3}, in 2os sTTI, RV cycling uses {RV1, RV2}, and in 3os sTTI, RV cycling uses {RV1, RV2, RV3}. (2) The RV pattern is cyclically used based on the OFDM symbol. That is, the RV pattern is cyclically used according to the preset or configured or indicated pattern {RV1, RV2, RV3, RV4}, which may be {RV1, RV2, RV3, RV4}={0,0,0,0} or {0,2 , 3, 1} or {0, 3, 0, 3}, for example: when the repeated transmission uses 2 sTTIs, if the preset pattern is {0, 2, 3, 1}, sTTI#n has 3 symbols, sTTI#n+1 has 2 symbols, and 2 sTTIs are repeated. Then sTTI#n uses {0, 2, 3}, and sTTI#1 uses {1, 0}. (3) The RV is the same in the sTTI, and the RV pattern is used between the sTTIs. In an embodiment, the RV pattern is {RV1, RV2, RV3, RV4}, which may be {0, 0, 0, 0} or {0, 2, 3, 1} or {0, 3, 0, 3} For example, if two sTTIs are used for repeated transmission, RV1 is used for multiple symbols in the first sTTI, and RV2 is used for multiple symbols in the second sTTI. For example, if the default pattern is {0, 2, 3, 1} sTTI#n has 3 symbols, sTTI#n+1 has 2 symbols, and 2 sTTIs are repeated. Then sTTI#n uses {0,0,0}, sTTI#1 uses {2,2}; With 3 sTTIs, RV1 is used for multiple symbols in the first sTTI, RV2 is used for multiple symbols in the second sTTI, and RV3 is used for multiple symbols in the third sTTI; for example, 6 sTTIs are used for repeated transmission. , RV1 is used for multiple symbols in the first sTTI, RV2 is used for multiple symbols in the second sTTI, RV3 is used for multiple symbols in the third sTTI, and RV4 is used for multiple symbols in the fourth sTTI. RV1 is used for multiple symbols in the fifth sTTI, and RV2 is used for multiple symbols in the sixth sTTI; that is, when the number of repetitions k is less than the length of the RV pattern, the first k RVs in the RV pattern can be used in sequence; The number of repetitions k is greater than RV When the length of the pattern is used, the RV pattern can be recycled in order. Or in an embodiment, the RV pattern is defined separately for different repetition times, for example, for the number of repetitions k=2 sTTI, the RV pattern adopts {RV1, RV2}={0, 0} or {0, 3}, when the number of repetitions k = 3 sTTIs, RV pattern using {RV1, RV2, RV3} = {0, 0, 0} or {0, 3, 0} or {0, 2, 3}.

In an embodiment, when repeating transmissions, different sTTIs use different MCS levels and multiple symbols within the sTTI use the same MCS. For example, the MCS level is decremented by sTTI and the multiple symbols MCS within the sTTI are the same. That is, the MCS used by sTTI x is not larger than the MCS used by sTTI y, MCS(sTTI x) ≤ MCS(sTTI y), where sTTI x is later than sTTI y from the time domain. In an embodiment, when MCI1 is used in the first sTTI of the DCI, the MCS level used in the subsequent sTTI is obtained according to the predefined or configured or indicated offset. If offset=2, the first sTTI is indicated according to the DCI. With MCS index #5, MCS index #3 is used for the second sTTI when the transfer is repeated twice. In an embodiment, when repeating transmission, different symbols in the same sTTI use different MCS levels and the same MCS pattern is used between multiple sTTIs, for example, the MCS level is the same among multiple sTTIs but within the same sTTI The OFDM symbol is decremented. That is, the MCS used by the symbol x is not larger than the MCS used by the symbol y, MCS(OS x) ≤ MCS(OS y), where OS x is later than OS y from the time domain.

In an embodiment, when the transmission is repeated, different sTTIs use the same MCS but use different frequency domain resource sizes, that is, the number of RBs used in the frequency domain is not the same. For example, the number of RBs used is incremented by sTTI. That is, the number of RBs used by sTTI x is not greater than the number of RBs used by sTTI y, where sTTI x is earlier than sTTI y from the time domain. In an embodiment, when the DCI indicates the number and location of the RBs used in the first sTTI of the repeated transmission, the number of RBs used in the subsequent sTTI is obtained according to the predefined or configured or indicated offset in the frequency domain mirroring, assuming offset=10, The system bandwidth includes 50 RBs. If RB#0-19 is used according to the DCI indication in the first sTTI, the second sTTI uses RB#0-19 and RB#40-49 and repeats RB#0- when repeating 2 transmissions. The data in 9.

With the channel repetition transmission method provided in this embodiment, in addition to obtaining the repeated transmission time domain energy accumulation gain, the coding gain, the frequency domain diversity gain, and the like brought by transmitting different redundancy versions can also be obtained. This enables URLLC requirements with fewer repetitions and improves system spectral efficiency.

Fifth embodiment

Based on any of the above embodiments, in an embodiment, when the sPDSCH or the sPUSCH is transmitted based on the OFDM symbol, the pilot and the data are multiplexed in the OFDM symbol by FDM (Frequency Division Multiplexing).

When the repeated transmission is based on OFDM symbol repetition within a single sTTI and the number of repetitions is equal to the number of OFDM symbols included in the sTTI, pilot sharing is allowed between symbols. For non-frequency hopping, the DMRS (Demodulation Reference Signal) shares the pattern as 'RD' or 'RDD', that is, when the sTTI contains 2 symbols or repeats 2 times, the first OFDM symbol includes DMRS. The second OFDM symbol does not contain DMRS, abbreviated as 'RD', that is, 'R' indicates that the symbol contains DMRS, 'D' indicates that the symbol does not contain DMRS; when sTTI contains 3 symbols or repeats 3 times, first The OFDM symbols contain DMRS, the second OFDM symbol and the third OFDM symbol do not contain DMRS, abbreviated as 'RDD'. For frequency hopping, in a single sTTI, there is only a possibility of sharing for 3 symbols, and for 2 OFDM symbols having the same frequency domain position, an 'RD' pattern is adopted.

When repeated transmissions are repeatedly transmitted in multiple sTTIs, if there is no frequency hopping between sTTIs in the sTTI, the pilots share the same method as when the single sTTIs are not hopped. If there is no frequency hopping between the sTTIs and the sTTIs are not hopped, the pilot sharing mode is: when the number of repetitions is 2 or 3 sTTIs, only the OFDM symbols located in different frequency domain locations in the first sTTI have DMRS, and the remaining OFDM The DMRS is not included in the symbol. Remark: sPUSCH supports up to 3 sTTIs to share DMRS, and sPDSCH can share up to 2 sTTIs. Table 1 uses sPUSCH as an example. The hops are hopped once in sTTI. Different rows indicate different hopping frequency domain positions. In sTTI#0, OS#0 and OS#1 respectively contain DMRS, OS#2, OS#4, OS#. 6 Share the DMRS in OS #1, and OS #3 and OS #5 share the DMRS in OS #0. If sPDSCH is indicated, R is required in sTTI#2, or R is placed at the intermediate sTTI position of 3 sTTIs, but it affects symbol-by-symbol demodulation. Table 2 is similar to Table 1, except that it is frequency-by-symbol frequency hopping and always starts frequency hopping from the sTTI boundary, that is, OS#2, OS#3, OS#5 shares DMRS in OS#0, OS#4, OS#6 shares the DMRS in OS#1. Table 3 is similar to Table 2, except that it is symbol-by-symbol frequency hopping, that is, OS#2, OS#4, OS#6 share DMRS in OS#0, OS#3, OS#5 share DMRS in OS#1. . Table 4 is similar to Table 1, except that each symbol in the sTTI is located in a different frequency domain.

Table 1

Table 2

table 3

Table 4

The pilot sharing in the channel repetition transmission method of the embodiment can achieve the addition of the time-domain energy accumulation gain of the repeated transmission, and can also reduce the pilot overhead by the pilot sharing, thereby improving the data transmission spectrum efficiency or the data transmission reliability. .

Sixth embodiment

Based on any of the above embodiments, in an embodiment, when the sPDSCH is transmitted based on a single OFDM symbol or based on sTTI transmission, the uplink control channel to which the HARQ-ACK is fed back is transmitted by a single OFDM symbol. At this time, the uplink control channel of a single OFDM symbol adopts a sequence-based sPUCCH.

In an embodiment, when the sPDSCH is transmitted based on a single OFDM symbol and is only repeated in the sTTI, that is, the number of repeated transmissions is equal to the number of OFDM symbols included in the sTTI, the bearer hybrid automatic repeat request response HARQ is determined according to n+k symbol timings. The symbol position of the s PUCCH of the ACK is, for example, taking k=4 as an example. Taking the DL sTTI pattern 1 as an example, the symbol position of the sPUCCH carrying the HARQ-ACK is at least the symbols #0, 3, 6, 8, 10, and 12 One.

In an embodiment, when the sPDSCH is transmitted based on a single OFDM symbol and the transmission is not repeated, since the sTTI boundary is to be aligned, that is, from the sTTI start symbol position transmission, the symbol position of the sPUCCH carrying the HARQ-ACK is determined according to n+k symbol timings. For example, taking k=4 as an example, taking DL sTTI pattern 1 as an example, the symbol position of the sPUCCH carrying the HARQ-ACK is at least one of symbols #1, 4 (or 5), 7, 9, 11, and 13.

In the sPDSCH single codeword and single carrier scenario, a single OFDM symbol sPUCCH carries 1 bit of ACK/NACK information. At this time, two sPUCCH resources are allocated for ACK and NACK respectively, for example, the same base sequence is used in the same RB and different CSs are used. That is, cyclic shift.

In an embodiment, for a single OFDM symbol sPUCCH, assuming that its resource allocation is the same as the sequence-based sPUCCH in the short TTI, the resources on the two symbols may be determined at a time, or only the resources of the single OFDM symbol sPUCCH carrying the HARQ-ACK. Then, the resource usage manner on other symbols in the sTTI includes at least one of the following: (1) allocation to the URLLC SR for use, for example, supporting a single OFDM symbol SR, and allocating a single OFDM symbol sPUCCH resource for the SR, in one embodiment, all symbol assignments , or only in the symbol allocation where the sPUCCH of the non-bearing HARQ-ACK is allocated, or the SR resource allocated in the symbol of the sPUCCH that is allocated in all symbols but not in the non-bearing HARQ-ACK is not less than the SR allocated in the symbol of the sPUCCH carrying the HARQ-ACK. Resources. (2) When a single OFDM symbol sPUCCH is different from a short TTI s PUCCH resource, when a single OFDM symbol sPUCCH is transmitted using a priority principle, a short TTI and/or a 1 ms TTI HARQ-ACK may be transmitted on other symbols, in this embodiment. The other symbols carry up to 2 bits and are based on the sequence-based sPUCCH of the short physical uplink control channel, that is, one symbol of stop/drop in the two symbols sPUCCH, or one symbol of three symbols sPUCCHstop/drop. (3) When the single OFDM symbol sPUCCH is the same as the short TTI s PUCCH resource, the other symbols still transmit the sPUCCH of the short TTI. Equivalent to simultaneous transmission and sPUCCH preferentially occupies resources on a single OFDM symbol. (4) In a pair of hop RBs, sPUSCH is transmitted on hop RBs paired with a single OFDM symbol sPUCCH on other symbols. (5) The same RB transmission sPUSCH is used on the other symbols as the single OFDM symbol sPUCCH. (6), based on (4) or (5), when a single OFDM symbol sPUCCH is located at the first symbol of the sTTI, the sPUSCH may serve as a redundant part of the sPUSCH in the latter sTTI; when the single OFDM symbol sPUCCH is located at the last sTTI For symbols, sPUSCH can be used as a redundant part of sPUSCH in the previous sTTI. When the sPUCCH is located in the middle symbol of the 3-symbol sTTI, the sPUSCH can be used as the redundant part of the sPUSCH in the previous sTTI when the first symbol is transmitted in the sTTI, and/or the sPU can be used as the latter sTTI when the last symbol in the sTTI is transmitted. The redundant part of the sPUSCH.

In an embodiment, the single OFDM symbol sPUCCH and sPUSCH collision processing manner includes at least one of the following: (1) transmitting a single OFDM symbol sPUCCH and sPUSCH when configured to be simultaneously transmittable; otherwise, transmitting only sPUSCH and including uplink Uplink control information (UCI) of sPUCCH. Here UCI is HARQ-ACK information. (2) When configured to not support simultaneous transmission and the sPUSCH supports a single OFDM symbol transmission, a single OFDM symbol sPUCCH is transmitted on the conflicting symbols, and the remaining symbols are transmitted on the sPUSCH based on repeated transmission of a single OFDM symbol. (3) When configured to not support simultaneous transmission and the sPUSCH does not support single OFDM symbol transmission, that is, the URLLC sPUSCH is the same as the sTTI sPUSCH, the collision processing is the same as the single OFDM symbol sPUCCH and sTTI sPUSCH.

In an embodiment, the single OFDM symbol sPUCCH and short TTI s PUCCH collision processing manner includes at least one of the following: (1) transmitting a single OFDM symbol sPUCCH, dropping or stopping transmission of the sTTI sPUCCH. In an embodiment, the HARQ-ACK information carried in the sTTI sPUCCH is transmitted in a single OFDM symbol sPUCCH. In an embodiment, the HARQ-ACK carried in the sTTI sPUCCH is supported to adopt spatial binding. (2) Transmitting a single OFDM symbol sPUCCH at a symbol where a single OFDM symbol sPUCCH is located, dropping or stopping transmission of sTTI sPUCCH; transmitting sTTI sPUCCH in a symbol without sPUCCH transmission of a single OFDM symbol. That is, when the sTTI sPUCCH collides with the single OFDM symbol sPUCCH, the sTTI sPUCCH on the collision symbol is cancelled, and the sTTI sPUCCH is still transmitted on the non-conflicting symbol, which is applicable to the sequence-based sPUCCH. (3) Transmit a single OFDM symbol sPUCCH, discard or stop transmitting sTTI sPUCCH. In an embodiment, when the HARQ-ACK information carried in the sTTI sPUCCH is 1 bit, or the HARQ-ACK information carried in the sTTI sPUCCH is 1 bit after being bound, it is transmitted in a single OFDM symbol sPUCCH. (4) Transmit a single OFDM symbol sPUCCH, discard or stop transmitting sTTI sPUCCH. In an embodiment, when the sTTI s PUCCH also carries the HARQ-ACK information of 1 ms, the HARQ-ACK of the 1 ms may be the PUCCH or the PUSCH bearer before being carried to the sPUCCH, and the processing manner includes at least one of the following: (4) 1) Both the HARQ-ACK of the sTTI and the HARQ-ACK information of 1 ms are not transmitted in the single OFDM symbol sPUCCH. In an embodiment, the single OFDM symbol sPUCCH carries the HARQ-ACK information as 2 bits at this time. (4-2) The sTTI HARQ-ACK information is transmitted, and the HARQ-ACK information of 1 ms is discarded. In an embodiment, only 1 bit of sTTI HARQ-ACK information is carried in a single OFDM symbol sPUCCH, and the sPUCCH bearer information of a single OFDM symbol is increased from 1 bit to 2 bits. (4-3) The 1 ms HARQ-ACK information is transmitted in a single OFDM symbol sPUCCH, and the sTTI HARQ-ACK is transmitted on other symbols, and the channel carrying the sTTI HARQ-ACK is a sequence-based sPUCCH. In an embodiment, the transmission on a resource paired with a single OFDM symbol sPUCCH, ie a pair of frequency hopping RB resources, is transmitted on other symbols. In an embodiment, when 1 ms of HARQ-ACK information is 1 bit, the sPUCCH bearer information of a single OFDM symbol is increased from 1 bit to 2 bits. In an embodiment, the information transmitted on other symbols contains only sTTI HARQ-ACK information, or sTTI HARQ-ACK and 1 ms HARQ-ACK information. (4-4) The HARQ-ACK information of the sTTI is transmitted in a single OFDM symbol sPUCCH, and the sTTI sPUCCH is transmitted on other symbols, and the sTTI sPUCCH is a sequence-based sPUCCH. In an embodiment, the transmission on a resource paired with a single OFDM symbol sPUCCH, ie a pair of frequency hopping RB resources, is transmitted on other symbols. In an embodiment, when the sTTI HARQ-ACK information is 1 bit, the sPUCCH bearer information of a single OFDM symbol is increased from 1 bit to 2 bits. In an embodiment, the information transmitted on other symbols contains only 1 ms of HARQ-ACK information, or sTTI HARQ-ACK and 1 ms of HARQ-ACK information. (4-5) Binding the HARQ-ACK of the sTTI to the HARQ-ACK information of 1 ms, that is, using the exclusive OR operation, the bundled information is carried in a single OFDM symbol sPUCCH. In an embodiment, sTTI HARQ- When both the ACK information and the 1 ms HARQ-ACK are 1 bit, the binding is still 1 bit, and the sPUCCH bearer information of a single OFDM symbol is increased from 1 bit to 2 bits.

In an embodiment, the single OFDM symbol sPUCCH and 1 ms PUCCH collision processing manner includes at least one of the following: (1) transmitting a single OFDM symbol sPUCCH, dropping or stopping transmitting 1 ms sPUCCH. In an embodiment, the HARQ-ACK information carried in the 1 ms PUCCH is transmitted in a single OFDM symbol sPUCCH. In an embodiment, transmission in a single OFDM symbol sPUCCH is supported only when the HARQ-ACK information carried in the 1 ms PUCCH is 1 bit. In an embodiment, the HARQ-ACK carried in the 1 ms PUCCH is supported to adopt spatial binding. (2) A single OFDM symbol sPUCCH is transmitted on the collision symbol, and a 1 ms PUCCH is transmitted on the remaining symbols, that is, the symbol that conflicts with the single OFDM symbol sPUCCH in the 1 ms PUCCH is cancelled. In an embodiment, when the 1 ms PUCCH conflicts with the single OFDM symbol sPUCCH by more than k symbols, the transmission of the 1 ms PUCCH is discarded or stopped. Wherein, in one embodiment, k is one of 2, 3, 4, 5, 6, 7, 8, 9, 10.

In an embodiment, the single OFDM symbol sPUCCH and the short TTI s PUSCH collision processing manner include at least one of the following: (1) transmitting the sPUCCH, dropping or stopping the transmission of the sTTI sPUSCH. In an embodiment, the HARQ-ACK information carried in the sTTI sPUSCH is transmitted in a single OFDM symbol sPUCCH. In an embodiment, the HARQ-ACK carried in the sTTI sPUSCH is supported by spatial binding. (2) When the single OFDM symbol sPUCCH is located in the last symbol of the sTTI, the UCI information carried in the single OFDM symbol sPUCCH is transmitted in the sPUSCH, that is, piggyback to the sPUSCH. In an embodiment, the last symbol of the sTTI is not the symbol of the DMRS. . (3) When a single OFDM symbol sPUCCH is located in a non-last symbol in the sTTI, a single OFDM symbol sPUCCH is transmitted, and the transmission sTTI sPUSCH is discarded or stopped. In an embodiment, supporting 1-bit HARQ-ACK information in the sPUSCH is transmitted in a single OFDM symbol sPUCCH.

With the channel repetition transmission method of this embodiment, in addition to obtaining the time domain energy accumulation gain of the downlink traffic channel repeated transmission, the HARQ delay can be reduced by using the feedback information transmitted by the single OFDM symbol. It can support HARQ retransmission within the specified delay boundary and improve the system spectrum efficiency.

Seventh embodiment

For the new radio (NR) downlink control channel (PDCCH) in the 5G system, the possibility of performing repeated transmission repetition is as follows:

The method 1 determines at least one of the following manners by using at least one of a predefined, a radio resource control RRC configuration, a downlink control information DCI indication, and a priority rule:

(Mode 1) repeatedly transmitting a repetition between a plurality of search spaces at different times of the same control resource set Coreset;

(Mode 2) Repetition between the same search spaces at different times of the same Coreset;

(Mode 3) Repetition between multiple search spaces at different times in different Coresets;

(Mode 4) Repetition between multiple search spaces at the same time in different Coresets;

(Mode 5) Repetition between multiple candidate sets candidate within the search space at the same time in the same Coreset;

(Mode 6) Repetition between multiple search spaces at the same time in the same Coreset;

(Method 7) determining a user-specific search space index USS ID and order of repeated transmissions;

(Mode 8) determining the order of different starting positions of the same USS ID for repeated transmission;

(Mode 9) Repetition in the ID order in all configured USS.

In an embodiment, for (Mode 1) repeated transmissions between multiple search spaces at different times in the same control resource set (Coreset). At this point, multiple search spaces are configured in the same Coreset. In an embodiment, each SS has 1 start symbol and the time domain symbol positions are different; in an embodiment, each SS has a plurality of start symbols and the time domain symbol positions are different. Taking the repetition twice as an example, the NR PDCCH is repeatedly transmitted in SS1 and SS2. Since the configurations of SS1 and SS2 may be the same or different, considering the combined computational complexity, the PDCCH repetition may use the same aggregation level and use the same in SS1 and SS2. Candidate set. As shown in FIG. 4, the Coreset duration duration=1, the SS1 start symbol is the first OFDM symbol in the slot, and the SS2 start symbol is the second OFDM symbol in the slot.

In an embodiment, for (mode 2) repeated transmissions between identical search spaces at different times in the same Coreset. At this time, one search space is configured in the same Coreset. In an embodiment, one SS has one start symbol in one cycle, and the start symbols in different periods are regarded as different occasions; in one embodiment, one SS is in one cycle. There are multiple start symbols inside, which are treated as multiple occasions. Taking the repetition twice as an example, the NR PDCCH is repeatedly transmitted in time 1 and time 2 of SS1. Considering the combined computational complexity, the PDCCH repetition can use the same aggregation level and use the same candidate set at time 1 and time 2 of SS1. As shown in FIG. 5, the Coreset duration duration=1, and the SS1 start symbol is the 1st OFDM symbol and the 2nd OFDM symbol in the slot.

In one embodiment, as shown in FIG. 6, for (mode 3) repetition between multiple search spaces at different times of different Coresets. At this time, the plurality of SS start symbols belonging to one or more Coresets are not all the same. In an embodiment, different SSs belong to different Coresets and start symbols are different; in an embodiment, different SSs belong to different Coresets and the start symbols are more than one time domain symbol position. Taking the repetition twice as an example, the NR PDCCH is repeatedly transmitted in SS1 and SS2, and SS1 and SS2 belong to different Coresets respectively. At this point, the Coreset configuration and the search space configuration may be different. In an embodiment, the PDCCH repetition uses the same aggregation level at SS1 and SS2 and uses the same candidate set.

In one embodiment, as shown in Figure 7, for (mode 4) repetition between multiple search spaces at the same time of different Coresets. The different SSs of the same start symbol each belong to a different Coreset. Different Corsets may not have the same frequency domain range and/or time domain duration. At this time, the frequency domain repetition can be supported. In this case, repeat the frequency domain repeat twice as an example. At this point, the Coreset configuration and the search space configuration may be different. In an embodiment, the PDCCH repetition uses the same aggregation level at SS1 and SS2 and uses the same candidate set.

In an embodiment, repetition is repeated between a plurality of candidate sets candidate within the search space at the same time in the same Coreset. In an embodiment, repeated transmissions are performed using different candidate sets of the same aggregation level, and the number of repetitions is equal to the number of candidate sets used; in one embodiment, multiple candidate sets of the maximum aggregation level are used for repeated transmission; In one embodiment, multiple candidate sets of the same aggregation level are aggregated for use; in one embodiment, candidate sets that are not used for all aggregation levels are aggregated for use.

In an embodiment, for (method 6) repetition between multiple search spaces at the same time in the same Coreset. At this time, multiple SS start symbols in the same Coreset are the same. This is equivalent to repeating the transmission between different SSs (but avoiding overlapping positions), which is equivalent to repeating in the frequency domain. But it does not rule out the use of different candidate repeats within the same SS. In an embodiment, repeated transmissions are performed using different candidate sets of different aggregation levels of different SSs, and the number of repetitions is equal to the number of candidate sets used; in one embodiment, multiple candidate sets of the maximum aggregation level are used for repetition. Transmission; in one embodiment, multiple candidate sets of the same aggregation level are aggregated for use; in one embodiment, candidate sets that are not used for all aggregation levels are aggregated for use.

In an embodiment, as shown in FIG. 8 , when the number of search space configurations is large, or when the same search space configuration start symbol position is large, determining that the specific search space is repeatedly transmitted includes at least one of the following methods: determining a repetition USS ID and order (Mode 7); Repetition in the ID order in all configured USSs (Mode 9). For example, repeating twice, if frequency domain priority is used, repeat transmission in SS1 and SS3; if time domain priority is used, it can be used in SS1 and SS2, SS1 and SS4, SS3 and SS4, SS3 and SS2. Repeat the transfer. Therefore, when the time domain is prioritized, it is also possible to distinguish whether the same Coreset takes precedence. Therefore, the search space of the repeated transmission may be selected by a preset principle, for example, at least one of the methods 1-6; or the USS ID and the sequence used for the repeated transmission are determined by the configuration, for example, SS1-4 is configured, and the repeated transmission is configured for 2 times. SS1 and SS2; or all configured USS are used, and are repeatedly transmitted in ID order in all configured USS.

In an embodiment, for mode 8, when the search space is configured with multiple start symbol positions in one slot, at this time, the search spaces determined at different start positions of the same SS ID are repeatedly transmitted. The search space determined by the start symbol is the same except for the start symbol. At this time, the repeated transmission needs to determine the order of the different starting positions of the same USS ID of the diploma. For example possible way: (alt.1) Repeat transmission in the order of the starting symbols without additional configuration; (alt.2) Configure the starting symbol position for repeated transmissions in all starting symbols of the same SS ID.

In an embodiment, when at least one of the

modes

1, 2, 3, 4, and 6 is used for repeated transmission, only one candidate set is used at one time of one search space when the transmission is repeated; or, When at least one of the

modes

2, 4, and 6 is repeatedly transmitted, a plurality of candidate sets are used at one time in one search space at the time of repeated transmission.

In an embodiment, the priority rule comprises at least one of the following:

When using the configured maximum aggregation level, the method 2 is used;

When using the configured non-maximum aggregation level, the method 5 is used;

When using the configured maximum aggregation level, the method 4 is used;

When configuring one Coreset, use the mode 2 or the mode 5;

When configuring one search space, use the mode 2 or the mode 5;

In the same type of search space configured, the method 5 is used;

In the configured same type of search space, the method 2 is used;

In the same type of search space configured, the method 4 is used.

Method 2: Repetition repeated transmission in the same search space uses the search space in the time domain equal to the duration of the Coreset multiplied by the number of repetitions or the maximum number of repetitions. Taking the maximum number of repetitions Rmax as an example, the time domain length of the search space is defined as duration×Rmax. In the time domain, the search space only determines the start symbol, and the time domain length is determined by the duration of the Coreset. At this time, the REG to CCE mapping and REG bundling operations are not affected, and are still only executed within the Coreset duration. The Rmax is introduced to define a search space, that is, the search space parameter introduces Rmax, and the PDCCH can perform a repetition number of at least one of Rmax, Rmax/2, Rmax/4, Rmax/8 in one search space.

With the channel repetition transmission method of the embodiment, in addition to obtaining the time domain energy accumulation gain of the downlink control channel repeated transmission, the HARQ delay can be reduced by using resources in different frequency domains in the same time domain to repeat. For example, it supports the repeated transmission with the search space as the granularity. In this case, it is not necessary to redefine the search space when the repeated transmission is performed, and the search space of the same configuration is realized for single transmission and repeated transmission.

Eighth embodiment

When the transmission granularity includes at least one of a candidate set, an sTTI, an OFDM symbol, and a search space, the repeated transmission determines at least one of the following by at least one of a predefined, an RRC configuration, a DCI indication, and a priority rule:

(Mode 1) Repetition (repetition transmission) in different search spaces between different sTTIs, in which case the search space time domain length is limited to only one sTTI;

(method 2) repetition between different candidate sets in the same search space in the same sTTI;

(Mode 3) Repetition between different search spaces, including the search space within the same sTTI;

(Mode 4) Repetition in the same search space between different sTTIs, where the search space time domain length is equal to R sTTIs, where R represents the number of repetitions or the maximum number of repetitions;

(Mode 5) repeating transmission based on OFDM symbols in the sTTI, wherein when the single symbol CRS-based sPDCCH is configured, the repeated transmission introduces a single symbol CRS-based sPDCCH in the non-first OFDM symbol in the sTTI; when configuring the two symbols CRS-based In the sPDCCH, the repeated transmission uses one candidate set in the first two symbols in the sTTI, and the single symbol CRS-based sPDCCH is introduced in the third symbol (if any).

In an embodiment, in an LTE URLLC, similar control channels may be repeatedly transmitted in the following manner:

Here, the channel used by the LTE URLLC is a short TTI channel as an example. For downlink control, the short TTI uses PDCCH/SPDCCH.

Method 1: The number of repeated transmissions is equal to the number of sTTIs used.

That is, the PDCCH/SPDCCH carrying the same sDCI is transmitted only once in each sTTI. When repeating transmissions, multiple sTTIs are required for repeated transmission. That is, the Rmax unit is sTTI and is not included in the configuration of the search space. Since the search space configuration does not distinguish between sTTI index #1-5, and can use the same aggregation level (AL) and the same candidate set. For example, the PDCCH search space carrying the sDCI needs to configure at least the AL used in the repeated transmission and the corresponding candidate set.

Method 2: Repeat the transmission in the same search space without changing the search space definition.

At this time, regardless of the PDCCH or the sPDCCH, multiple candidates are repeatedly transmitted in the same search space. That is, the number of repeated transmissions is equal to the number of candidates used. It can be a duplicate transfer using a different candidate for the same AL. Can support frequency domain repetition or time domain repetition. When one candidate set is only located in a single OFDM symbol, time domain repetition can also be supported at this time, and frequency domain repetition can be supported. When one candidate set is located in multiple OFDM symbols, frequency domain repetition is supported at this time.

Method 3: The number of repeated transmissions is equal to the number of search spaces used.

Because sTTI#1-5 can be configured with 1-2 sets, and because the search space is defined in the set, each sTTI supports up to 2 repetitions when the transmission is repeated in search space. Since sTTI#0 uses PDCCH, it supports up to 1 repetition. At this time, with respect to Method 1, the extension case is that the configuration supports 2 sets and supports repeated transmission in different sets. In this case, in addition to supporting time domain repetition, frequency domain repetition is also supported.

Method 4: Use Method 1 and redefine the search space.

That is, the search space definition includes the time domain repetition number Rmax and the starting sTTI. Preferably, the starting sTTI is any sTTI, or the period M is granular, and the starting sTTI is allowed once per period. At this time, when the search space configures AL and candidate, it applies to all sTTIs, and does not distinguish between sTTI#0 and sTTI#1-5.

Method 5: Repeat the transmission symbol by symbol.

For the single-symbol CRS-based sPDCCH, except for sTTI#0, it is allowed to repeat symbol by symbol in other sTTIs. Currently, if the CRS-based sPDCCH is configured in sTTI #1-5 and the number of time domain symbols is 1, only the first symbol of each sTTI can transmit the SPDCCH. Considering the URLLC feature, it is most advantageous to support the symbol-by-symbol repetition transmission. In this case, one sTTI can support 2-3 repetitions, which is equivalent to introducing a single-symbol CRS-based sPDCCH in the non-first symbol in the sTTI. Therefore, for method 5, when a single symbol CRS-based sPDCCH is configured, the Rmax unit is OS at this time, and preferably the number of symbols included in repetition times=sTTI.

For the two-symbol CRS-based sPDCCH, except for sTTI#0, it is allowed to repeat symbol by symbol in other sTTIs. When configured as a two-symbol CRS-based sPDCCH and allowed to repeat symbol by symbol, similar to method 2 in 2OS-sTTI, the difference is that the selected candidate is one of each symbol (a special case of method 2); in 3OS- In sTTI, unlike Method 2, except that one candidate is selected in the first two symbols, it is also repeated in the third symbol, which is equivalent to introducing a single symbol CRS-based sPDCCH in the third symbol.

The DMRS-based sPDCCH does not support symbol-by-symbol repetition.

Methods

1, 4, and 5 are time domain repetitions, and

methods

2 and 3 include frequency domain repetition.

In an embodiment, the method used for repeating transmission uses at least one of methods 1-5 by configuration.

In an embodiment, the priority rule comprises at least one of the following:

When one physical resource block set PRB set is configured, the mode 2 is used;

When two PRB sets are configured, the mode 3 is used, and only one candidate set is used in each search space;

When the configured maximum aggregation level is used, the mode 1 is used;

When the configured non-maximum aggregation level is used, the mode 2 is used;

Fixedly using the method 4;

The method 1 described above is fixed.

Ninth embodiment

Please refer to FIG. 9. FIG. 9 is a schematic structural diagram of a channel sending apparatus according to a ninth embodiment of the present disclosure, including:

a granularity confirmation module 901, configured to determine a transmission granularity of data transmitted on a channel to be transmitted;

The data transmission module 902 is configured to perform repeated transmission of data on the channel based on the transmission granularity.

In an embodiment, the transmission granularity may include at least one of: orthogonal frequency division multiplexing OFDM symbols, short transmission time interval sTTI. The transmission granularity refers to the unit size of data repeatedly transmitted on the channel, and the OFDM symbol is used as the transmission granularity, indicating that the repetition of the data can be to the extent of the OFDM symbol size, and the sTTI is the transmission granularity, indicating that the data can be repeated to a given The extent of the size of the sTTI. The size of the sTTI may be arbitrarily given. Generally, it contains fewer OFDM symbols, for example, no more than 7 OFDM symbols, but is not limited thereto.

Configure the number of repeated transmissions through high layer signaling.

In an embodiment, the repeatedly transmitted redundancy version pattern RV pattern length may be equal to the number of repeated transmissions.

The RV pattern is repeated in cycles of sTTI;

RV pattern is used cyclically based on OFDM symbols;

Use the same RV pattern within the same sTTI and cycle between different sTTIs.

In an embodiment, when the repeated transmission of data is performed on the channel, when the repeated transmission is based on OFDM symbol repetition within a single sTTI, and the number of repetitions is equal to the number of OFDM symbols included in the sTTI, then the OFDM symbol is guided within the sTTI. Frequency can be shared.

In an embodiment, when the channel is the short physical downlink traffic channel sPDSCH, the uplink control channel for which the hybrid automatic repeat request response HARQ-ACK is fed back is transmitted by using a single OFDM symbol.

In an embodiment, the uplink control channel is a short physical uplink control channel sPUCCH;

When the sPUCCH transmitted by the single OFDM symbol collides with the short physical uplink shared channel sPUSCH transmitted by using the single OFDM symbol, the sPUCCH is transmitted on the conflicting OFDM symbol, and the sPUSCH is transmitted on the remaining OFDM symbols;

Through the implementation of the embodiment, repeated transmission of data in a short transmission time interval can be realized, and in addition to obtaining the time-domain energy accumulation gain of the repeated transmission, the coding gain and the frequency domain diversity gain brought by transmitting different redundancy versions can also be obtained. Etc., so that the URLLC requirement is achieved with fewer repetitions, and the system spectrum efficiency is improved.

Tenth embodiment

Please refer to FIG. 10. FIG. 10 is a schematic structural diagram of a network device according to an eighth embodiment of the present disclosure, including: a processor 101, a memory 102, and a communication bus 103. The communication bus 103 is configured to implement between the processor 101 and the memory 102. The connection communication; the processor 901 is configured to execute the computer program stored in the memory 102 to implement the steps of the channel transmission method in the foregoing various embodiments, and details are not described herein again.

In an embodiment, the network device in this embodiment is a base station or a user equipment UE, including a mobile terminal, a PC, a smart wearable device, a server, and the like, or a device other than the base station and the user equipment UE.

Eleventh embodiment

The embodiment provides a computer readable storage medium having stored therein one or more computer programs executable by one or more processors to implement the foregoing various embodiments The channel transmission method will not be described here.

Those skilled in the art will appreciate that the above-described plurality of modules or steps of the present application may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices. In an embodiment, they may be implemented by program code executable by a computing device such that they may be stored in a storage medium (ROM/RAM, diskette, optical disk) by a computing device, and in some In this case, the steps shown or described may be performed in an order different from that herein, or they may be separately fabricated into a plurality of integrated circuit modules, or a plurality of the modules or steps may be fabricated into a single integrated circuit module. . Therefore, the application is not limited to any particular combination of hardware and software.

Claims

A channel transmission method includes:

Determine the granularity of the transmission used in channel transmission;

Repeated transmission of data is performed on the channel based on the transmission granularity.
The channel transmission method according to claim 1, wherein said transmission granularity comprises at least one of: orthogonal frequency division multiplexing OFDM symbols, short transmission time interval sTTI, search space, time slot, microslot, and candidate set .
The channel transmission method according to claim 2, wherein when the transmission granularity includes an OFDM symbol, the method of determining the number of repeated transmissions is any one of the following:

The number of repeated transmissions is the number of OFDM symbols included in one sTTI;

Dynamically indicating the number of repeated transmissions by using downlink control information;

The number of repeated transmissions is configured by higher layer signaling.
The channel transmission method according to claim 2, wherein when the transmission granularity comprises sTTI, the method of determining the number of repeated transmissions is any one of the following:

Dynamically indicating the number of repeated transmissions by using downlink control information;

The number of repeated transmissions is configured by higher layer signaling.
The channel transmission method according to claim 2, wherein when said transmission granularity is an OFDM symbol, said repeated transmission times are in units of said sTTI.
The channel transmission method according to any one of claims 3 to 5, wherein the repeating transmission of data on the channel further comprises: the repeated transmission does not cross at least one of the following boundaries: an sTTI boundary, Slot boundaries and sub-frame boundaries.
The channel transmission method according to claim 3 or 4, wherein the repeatedly transmitted redundancy version pattern RV pattern length is equal to the number of repeated transmissions.
The channel transmission method according to claim 5, wherein the manner of determining the repeatedly transmitted redundancy version pattern RV pattern comprises any one of the following:

Using the RV pattern based on OFDM symbols within sTTI, repeating with sTTI as a period;

Reusing the RV pattern based on OFDM symbols;

The same RV is used for multiple OFDM symbols within the same sTTI, and the RV pattern is used between different sTTIs.
The channel transmission method according to claim 3 or 5, wherein said repeating transmission of said data on said channel, when said repeated transmission is repeated based on OFDM symbols within sTTI, supporting said guide in said sTTI Frequency sharing.
The channel transmission method according to claim 9, wherein when said data is repeatedly transmitted on said channel,

When the repeated transmission is repeatedly transmitted between multiple sTTIs and does not hop in the sTTI, and only hopping between sTTIs, the pilots of the OFDM symbols in the sTTI are shared;

When the repeated transmission is repeatedly transmitted between multiple sTTIs and hopped within the sTTI, and the sTTIs are not hopped, the pilots of the OFDM symbols located in different frequency domain positions in the first sTTI are shared to the same frequency in other sTTIs. The OFDM symbol of the domain location.
The channel transmission method according to any one of claims 1 to 5, wherein when the channel is a short physical downlink traffic channel sPDSCH, the uplink control channel for the sPDSCH feedback hybrid automatic repeat request response HARQ-ACK adopts a single symbol. transmission.
The channel transmission method according to claim 11, wherein the time domain position of the uplink control channel in the subframe is a preset six OFDM positions under a preset feedback timing condition.
The channel transmission method according to claim 11, wherein the uplink control channel is a short physical uplink control channel sPUCCH;

When the sPUCCH transmitted by using a single OFDM symbol collides with a short physical uplink traffic channel sPUSCH that is based on repeated transmission of a single OFDM symbol, the sPUCCH is transmitted on a conflicting OFDM symbol, and the sPUSCH is transmitted on the remaining OFDM symbols;

When the sPUCCH transmitted with a single OFDM symbol collides with an sPUCCH that uses sTTI-based repeated transmission, the sPUCCH transmitted using a single OFDM symbol is transmitted on the conflicting OFDM symbol, and the sTTI transmission is transmitted on the non-conflicting OFDM symbol sPUCCH.
The channel transmission method according to claim 11, wherein when sPUCCH based on single OFDM symbol transmission is used, collision with sPUCCH based on sTTI transmission is used, and at most one bit of HARQ-ACK in sPUCCH based on sTTI transmission needs to be placed on a single When transmitting in the sPUCCH of the OFDM symbol transmission, the HARQ-ACK in the sPUCCH based on the sTTI transmission is reserved, and the HARQ-ACK of the sPUCCH transmitted using the single OFDM symbol is discarded or stopped.
The channel transmission method according to claim 2, wherein the channel is a downlink control channel, and when the transmission granularity includes at least one of a search space search space and a candidate set, the RRC configuration and the downlink control are controlled by a predefined, radio resource. At least one of the information DCI indication and the priority rule determines that the repeated transmission mode is at least one of the following:

Method 1: repeatedly transmitting a repetition between multiple search spaces at different times of the same control resource set Coreset;

Mode 2: Repetition between the same search space at different times of the same Coreset;

Mode 3: Repetition between multiple search spaces at different times in different Coresets;

Mode 4: Repetition between multiple search spaces at the same time in different Coresets;

Mode 5: Repetition between multiple candidate sets candidate in the search space at the same time in the same Coreset;

Mode 6: Repetition between multiple search spaces at the same time in the same Coreset;

Method 7: determining a user-specific search space index USS ID and order of repeated transmissions;

Mode 8: determining the order of different starting positions of the same USS ID for repeated transmission;

Mode 9: Repetition in the ID order in all configured USS.
The channel transmission method according to claim 15, wherein when repeat transmission is performed using at least one of said modes 1, 2, 3, 4, and 6, only one copy is used at one time of one search space at the time of repeated transmission Alternatively, when repeat transmission is performed using at least one of the modes 2, 4, and 6, when the transmission is repeated, a plurality of candidate sets are used at one time in one search space.
The channel transmission method according to claim 15, wherein said priority rule comprises at least one of the following:

When using the configured maximum aggregation level, the method 2 is used;

When using the configured non-maximum aggregation level, the method 5 is used;

When using the configured maximum aggregation level, the method 4 is used;

When configuring one Coreset, use the mode 2 or the mode 5;

When configuring one search space, use the mode 2 or the mode 5;

In the same type of search space configured, the method 5 is used;

In the configured same type of search space, the method 2 is used;

In the same type of search space configured, the method 4 is used.
The channel transmission method according to claim 2, wherein when the transmission granularity includes a time slot or a minislot, the search space used for the repeated transmission is equal to the duration of the lifetime of the Coreset multiplied by the number of repetitions or the maximum repetition. frequency.
The channel transmission method according to claim 2, wherein when the transmission granularity comprises at least one of a candidate set, an sTTI, an OFDM symbol, and a search space, at least one of a predefined, an RRC configuration, a DCI indication, and a priority rule is adopted. The method of determining repeated transmission includes at least one of the following:

Mode 1: Repetition in different search spaces between different sTTIs, and the search space time domain length is within 1 sTTI;

Mode 2: Repetition between different candidate sets in the same search space in the same sTTI;

Mode 3: Repetition between different search spaces within the same sTTI;

Mode 4: Repetition in the same search space between different sTTIs, and the search space time domain length is equal to R sTTIs, where R represents the number of repetitions or the maximum number of repetitions;

Manner 5: Repetitive transmission based on OFDM symbols in an sTTI, wherein when a single symbol is based on a CRS-based short physical downlink control channel sPDCCH of a cell reference signal, repeated transmission introduces a single symbol CRS-based in a non-first OFDM symbol in sTTI sPDCCH; when two-symbol CRS-based sPDCCH is configured, the repeated transmission uses one candidate set in the first two symbols in the sTTI, and the single symbol CRS-based sPDCCH is introduced in the third symbol.
The channel transmission method according to claim 19, wherein said priority rule comprises at least one of the following:

When one physical resource block set PRB set is configured, the mode 2 is used;

When two PRB sets are configured, the mode 3 is used, and only one candidate set is used in each search space;

When the configured maximum aggregation level is used, the mode 1 is used;

When the configured non-maximum aggregation level is used, the mode 2 is used;

Fixedly using the method 4;

The method 1 described above is fixed.
A channel transmission device comprising:

a granularity confirmation module, configured to determine a transmission granularity used in channel transmission;

A data transmission module is arranged to perform repeated transmission of data on the channel based on the transmission granularity.
The channel transmission apparatus according to claim 20, wherein said transmission granularity comprises at least one of: an OFDM symbol, an sTTI, a search space, a slot, a minislot, and a candidate set.
A network device including a processor, a memory, and a communication bus;

The communication bus is configured to implement connection communication between the processor and the memory;

The processor is arranged to execute a computer program stored in the memory to implement the steps of the channel transmission method according to any of claims 1-20.
A computer readable storage medium, wherein the computer readable storage medium stores at least one computer program executable by at least one processor to implement the method of any of claims 1-20 The steps of the channel transmission method.