Transmission method and apparatus, storage medium, and electronic device

Abstract

This invention provides a transmission method and apparatus, a storage medium, and an electronic device. The method includes: a communication node repeatedly transmitting data using a first transmission time interval, wherein the repeated transmission occurs within one or more second transmission time intervals, and the second transmission time intervals include multiple first transmission time intervals. This invention solves the technical problem in related technologies where insufficient repeated transmissions lead to unreliable reliability when the first short transmission time interval of the next subframe is unavailable after crossing a subframe boundary or when the type of the next subframe changes.

Description

Technical Field

[0001] This invention relates to the field of communications, and more specifically, to a transmission method and apparatus, a storage medium, and an electronic device. Background Technology

[0002] Among related technologies, the demands on fourth-generation mobile communication technology (4G) Long-Term Evolution (LTE) / Long-Term Evolution-Advanced (LTE-Advanced / LTE-A) and fifth-generation mobile communication technology (5G) are increasing. Both 4G and 5G systems are researching features that support enhanced mobile broadband, ultra-high reliability, ultra-low latency transmission, and massive connectivity.

[0003] Repeated transmissions of services with short transmission intervals can guarantee low latency and reliability when allowed to cross subframe boundaries; otherwise, interruption of repeated transmissions at subframe boundaries leads to a loss of reliability. If repeated transmissions cross subframe boundaries and the first short transmission interval of the next subframe becomes unavailable, or if the type of the next subframe changes, the number of repeated transmissions may be insufficient, thus compromising reliability.

[0004] There are currently no effective solutions to the aforementioned problems in the relevant technologies. Summary of the Invention

[0005] This invention provides a transmission method and apparatus, a storage medium, and an electronic device.

[0006] According to an embodiment of the present invention, a transmission method is provided, comprising: a communication node repeatedly transmitting data using a first transmission time interval, wherein the repeated transmission is located in one or more second transmission time intervals, the second transmission time intervals comprising a plurality of the first transmission time intervals.

[0007] According to another embodiment of the present invention, a transmission device is provided, comprising: a transmission module for repeatedly transmitting data using a first transmission time interval, wherein the repeated transmission is located in one or more second transmission time intervals, the second transmission time intervals comprising a plurality of the first transmission time intervals.

[0008] According to yet another embodiment of the present invention, a storage medium is also provided, wherein a computer program is stored therein, wherein the computer program is configured to execute the steps in any of the above method embodiments when running.

[0009] According to yet another embodiment of the present invention, an electronic device is also provided, including a memory and a processor, wherein the memory stores a computer program and the processor is configured to run the computer program to perform the steps in any of the above method embodiments.

[0010] Through this invention, when transmitting data in the first transmission time interval, the repeated transmission based on the first transmission time interval is located in one or more second transmission time intervals. This solves the technical problem in related technologies where the number of repeated transmissions is insufficient and reliability cannot be guaranteed when the first short transmission time interval of the next subframe is unavailable or the type of the next subframe changes after crossing the subframe boundary. This invention can achieve unambiguous transmission of communication nodes, ensure that repeated transmission can meet the requirements of low latency and high reliability, and guarantee the correctness of repeated transmission merging and demodulation. Attached Figure Description

[0011] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0012] Figure 1 This is a flowchart of a transmission method according to an embodiment of the present invention;

[0013] Figure 2 This is a structural block diagram of a transmission device according to an embodiment of the present invention;

[0014] Figure 3 This is a schematic diagram illustrating the division of short TTI within a subframe according to an embodiment of the present invention. Detailed Implementation

[0015] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the present application can be combined with each other.

[0016] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0017] Example 1

[0018] This embodiment provides a transmission method. Figure 1This is a flowchart of a transmission method according to an embodiment of the present invention, such as... Figure 1 As shown, the process includes the following steps:

[0019] In step S102, the communication node repeatedly transmits data using a first transmission time interval, wherein the repeated transmission is located in one or more second transmission time intervals, and the second transmission time intervals contain multiple first transmission time intervals.

[0020] Through the above steps, when data is repeatedly transmitted in the first transmission time interval, the repeated transmission is located in one or more second transmission time intervals, and the second transmission time interval contains multiple first transmission time intervals. This solves the technical problem in related technologies that when repeated transmission occurs after crossing the subframe boundary, the number of repeated transmissions is insufficient, thus failing to guarantee reliability. It can achieve unambiguous transmission of communication nodes, ensure that repeated transmission can meet the requirements of low latency and high reliability, and guarantee the correctness of repeated transmission merging and demodulation.

[0021] In this embodiment, the first transmission time interval includes at least one of the following, but not limited to subslot, slot, and subframe; the second transmission time interval includes, but is not limited to, subframe.

[0022] Optionally, the communication node that performs the above steps can be a base station, a terminal, a relay, etc., but is not limited to these.

[0023] Optionally, when repeated transmissions occur within multiple second transmission time intervals, the first first transmission time interval (excluding the first second transmission time interval) among the multiple second transmission time intervals is used for data transmission. Using it for data transmission also indicates that it is counted as a valid repetition and that the transmission time interval is available.

[0024] Optionally, the first transmission time interval in the second transmission time interval is used for data transmission under one of the following conditions: semi-static configuration control format indicator (CFI) = 1, and dynamic indicator CFI = 1; semi-static configuration CFI = 1, and the terminal does not want to receive dynamic indicator CFI = 2 or 3.

[0025] Optionally, when the repeated transmission is located in multiple second transmission time intervals, and the second transmission time interval is a subframe, the first transmission of the repeated transmission is located in non-Multimedia Broadcast Single Frequency Network (non-MBSFN) subframe n and configured as a transmission mode based on cell-specific reference signals (CRS); some or all of the non-first transmissions in the repeated transmission are located in subframe n+1 and are MBSFN subframes and configured as a transmission mode based on user-specific reference signals (DMRS), wherein the Physical Downlink Shared Channel (PDSCH) located in subframe n+1 uses the same transmission mode as subframe n, where n is an integer not less than 0.

[0026] Optionally, when the repeated transmission is located in multiple second transmission time intervals, and the second transmission time interval is a subframe, the m-th transmission in the repeated transmission is located in non-MBSFN subframe n and configured as a transmission mode based on the cell proprietary reference signal CRS; the (m+1)-th transmission in the repeated transmission is located in subframe n+1 and is an MBSFN subframe and configured as a transmission mode based on the user proprietary reference signal DMRS, wherein the physical downlink shared channel (PDSCH) located in subframe n+1 uses the same transmission mode as subframe n, where n is an integer not less than 0 and m is a natural number.

[0027] Optionally, the PDSCH in subframe n+1 is mapped to the RE used by DMRS contained in the allocated resource area.

[0028] Optionally, in subframe n+1, the PDSCH in the MBSFN subframe is demodulated using the CRS in the preceding one or two symbols of the MBSFN subframe.

[0029] Optionally, before the communication node repeatedly transmits data using the first transmission time interval, it also includes:

[0030] The Redundancy Version (RV) pattern used for repeated transmissions is determined using one of the following methods:

[0031] Preset or configure the RV Pattern based on the number of repetitions;

[0032] The set of P RV versions used by default or in configuration, wherein the RV field in the downlink control information (DCI) is indicated in the RV version set;

[0033] Preset or configure RV Pattern, dynamically indicate the starting RV, cyclically use the starting RV, and when the last RV k=1 of the P repeated transmissions is not RV X, force conversion to RV X, where X is a preset or configured value and takes one of {0,1,2,3};

[0034] Based on the RV field indication RV Pattern in DCI, the RV version of the current Transmission Time Interval (TTI) is determined in combination with the k value of the notification. Among them, the RV indication is the same for different transmission counts k in the same repeated transmission P.

[0035] Where 1≤k≤P, P represents the number of repeated transmissions, and P is a positive integer greater than 1.

[0036] Optionally, the last RV version in the RV Pattern is RV0.

[0037] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0038] Example 2

[0039] This embodiment also provides a transmission device for implementing the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0040] Figure 2 This is a structural block diagram of a transmission device according to an embodiment of the present invention, such as... Figure 2 As shown, the device includes:

[0041] Transmission module 20 is configured to repeatedly transmit data using a first transmission time interval, wherein the repeated transmission occurs within one or more second transmission time intervals, the second transmission time intervals comprising a plurality of first transmission time intervals.

[0042] It should be noted that the above modules can be implemented by software or hardware. For the latter, they can be implemented in the following ways, but are not limited to: all the above modules are located in the same processor; or, the above modules are located in different processors in any combination.

[0043] Example 3

[0044] This embodiment aims to address the problem of how to support repeated transmission of services with short transmission intervals in a communication system when crossing subframe boundaries is allowed, but the first short transmission interval of the next subframe is unavailable or the type of the next subframe changes.

[0045] The application environment of this embodiment is not limited to 4G or 5G systems. Taking a 4G LTE system as an example, the shorter transmission time interval is called the short transmission time interval (sTTI), with a length of subslot (2 / 3 symbols) or slot (7 symbols); the transmission time interval (TTI) is called the subframe, with a length of 1ms. Taking a 5G NR system as an example, the shorter transmission time interval is called the mini-slot, i.e., the TTI length is 2, 4, or 7 Orthogonal Frequency Division Multiplexing (OFDM) symbols, and the transmission time interval (TTI) is called the slot, with a length of 14 OFDM symbols (normal CP). The following embodiments are illustrated from the perspective of a 4G system, but are not limited to 4G systems. The communication nodes described in the embodiments can be base stations, terminals, or other network elements in communication networks.

[0046] This embodiment also includes the following implementation methods, which can be used in combination without contradiction:

[0047] Implementation Method 1

[0048] Figure 3 This is a schematic diagram illustrating the division of short TTI within a subframe according to an embodiment of the present invention. The short TTI is divided within the subframe as follows: Figure 3As shown, Pattern 1 is used when CFI = 1 or 3, and Pattern 2 is used when CFI = 2. However, when supporting URLLC, the insufficient reliability of the PCFICH channel may lead to CFI detection errors. Therefore, the CFI value is determined through RRC configuration. PDSCH supports repetition at the granularity of sTTI to support URLLC requirements. The (S)PDCCH scheduled for this process is not retransmitted. However, except for the first repetition, each subsequent repetition may or may not send (S)PDCCH. The DCI information carried by (S)PDCCH includes a repetition count indication. For example, taking 3 repetitions as an example, the first PDSCH transmission in the repetition process is indicated by (S)PDCCH with a repetition count k = 3. The terminal detects the (S)PDCCH and receives the merged PDSCH within 3 sTTIs. If the (S)PDCCH of the first PDSCH transmission is not detected, the (S)PDCCH will continue to be detected in the second transmission. At this time, the number of PDSCH repetitions k=2 is indicated. The terminal detects the (S)PDCCH and receives the merged PDSCH in 2 sTTIs.

[0049] When repeated transmissions cross subframe boundaries, for example, if three transmissions are performed using subslots #4 and #5 of subframe #n and subslot #0 of subframe #n+1 respectively, it is necessary to ensure that subslot #0 is available. The condition for subslot #0 to be available is that the configured CFI = 1. However, since the configured CFI value may differ from the dynamically indicated CFI value, if the UE determines that subslot #0 is available based solely on the configured CFI = 1, then when the actual dynamic indication in subframe #n+1 is CFI = 2 or 3, subslot #0 will not be available. If the UE then merges the repeatedly transmitted data, it will severely impact performance, leading to data demodulation errors and preventing the achievement of high reliability.

[0050] To address the aforementioned issues, this implementation proposes the following solution: For a communication node, when k repeated transmissions are not all located within the same subframe (i.e., repeated transmissions cross subframe boundaries), the condition for including sTTI#0 in the valid repetition count (i.e., sTTI#0 is available) is: CFI is configured = 1 and the dynamic indication CFI is = 1. Alternatively, for a communication node, when k repeated transmissions are not all located within the same subframe (i.e., repeated transmissions cross subframe boundaries), the condition for including sTTI#0 in the valid repetition count (i.e., sTTI#0 is available) is: CFI is configured = 1, and the UE does not want the dynamic CFI to be 2 or 3 at this time.

[0051] For example, taking three repeated transmissions as an example, if the three repeated transmissions use subslots #4 and #5 of subframe #n and subslot #0 of subframe #n+1 respectively, it is necessary to ensure that subslot #0 is available. That is, the configured CFI = 1 and the dynamically indicated CFI = 1. In other words, the UE does not want to receive a dynamic indication CFI = 2 or 3. If the three repeated transmissions use subslots #4 and #5 of subframe #n and subslot #1 of subframe #n+1 respectively, then subslot #0 of subframe #n+1 is unavailable. That is, the configured CFI = 2 or 3. The terminal determines that subslot #0 in the corresponding sTTI Pattern cannot be used for service transmission based on the configured CFI value; or the configured CFI = 1, and a dynamic indication CFI = 2 or 3 is received. The terminal determines that subslot #0 in the corresponding sTTI Pattern cannot be used for service transmission based on the configured CFI value.

[0052] This embodiment is not limited to the downlink service channel of the LTE system. For example, when PDSCH or PUSCH retransmissions cross subframe or slot boundaries, and the first transmission in the retransmission is located in subframe / slot#n, while some or all of the non-first transmissions in the retransmission are located in subframe / slot#n+1, under certain conditions, it is necessary to ensure that the first short transmission time interval in subframe / slot#n+1 is available. The condition for the first short transmission time interval to be available is that the configured format indication is the same as the dynamic format indication, or the dynamic indication of the transmission direction is available. Preferably, the format indication is a control format indication, a slot format indication, an uplink resource indication, etc. When the configured format indication is different from the dynamic format indication, or when the dynamic indication of the transmission direction is unavailable, the first short transmission time interval in subframe / slot#n+1 is unavailable.

[0053] By using the retransmission method described in this embodiment, and by determining how to ensure that subslot#0 is available when CFI=1 is configured when retransmission is allowed to cross subframe boundaries, unambiguous transmission can be achieved between the base station and the terminal side, ensuring that retransmission can meet the low latency and high reliability requirements of URLLC, and ensuring the correctness of retransmission merging and demodulation.

[0054] Implementation Method 2

[0055] Short TTI is divided in the subframe as follows: Figure 3As shown, Pattern 1 is used when CFI = 1 or 3, and Pattern 2 is used when CFI = 2. However, when supporting URLLC, the insufficient reliability of the PCFICH channel may lead to CFI detection errors. Therefore, the CFI value is determined through RRC configuration. PDSCH supports repetition at the granularity of sTTI to support URLLC requirements. The (S)PDCCH scheduled for this process is not retransmitted. However, except for the first repetition, each subsequent repetition may or may not send (S)PDCCH. The DCI information carried by (S)PDCCH includes a repetition count indication. For example, taking 3 repetitions as an example, the first PDSCH transmission in the repetition process is indicated by (S)PDCCH with a repetition count k = 3. The terminal detects the (S)PDCCH and receives the merged PDSCH within 3 sTTIs. If the (S)PDCCH of the first PDSCH transmission is not detected, the (S)PDCCH will continue to be detected in the second transmission. At this time, the number of PDSCH repetitions k=2 is indicated. The terminal detects the (S)PDCCH and receives the merged PDSCH in 2 sTTIs.

[0056] When repeated transmissions cross subframe boundaries, for example, three repeated transmissions using subslots #4 and #5 of subframe #n and subslot #0 of subframe #n+1 respectively, or three repeated transmissions using subslot #5 of subframe #n and subslots #0 and #1 of subframe #n+1 respectively, subslot #0 can be used for service transmission. Furthermore, subframe #n is a non-MBSFN subframe, and subframe #n+1 is an MBSFN subframe. The non-MBSFN subframe is configured with CRS-based transmission mode, while the MBSFN subframe is configured with DMRS-based transmission mode. In subframe #n+1, because there is no (S)PDCCH scheduling, or even if there is (S)PDCCH scheduling but the UE discards it, the necessary parameter information for DMRS demodulation is missing, making it impossible to receive and demodulate data in subframe #n+1. In this case, the UE cannot merge the repeatedly transmitted data, which severely impacts performance and prevents the achievement of high reliability.

[0057] To address the aforementioned issues, the solution in this implementation is as follows: For a communication node, when not all k repeated transmissions are located in the same subframe (i.e., repeated transmissions cross subframe boundaries), the first transmission of the repeated transmission is located in a non-MBSFN subframe n and configured as a CRS-based transmission mode. Some or all of the non-first transmissions in the repeated transmissions are located in subframe n+1 and are MBSFN subframes configured as DMRS-based transmission modes. At this time, the PDSCH located in subframe n+1 still uses the CRS-based transmission mode, and DMRS is not transmitted in the PDSCH.

[0058] Furthermore, the CRS in the first one or two symbols of the MBSFN subframe is used in subframe n+1.

[0059] For example, taking three repeated transmissions as an example, when the three repeated transmissions use subslots #4 and #5 of non MBSFN subframe #n and subslot #0 of MBSFN subframe #n+1 respectively, it is necessary to ensure that subslot #0 is available. That is, the configured CFI = 1 and the dynamic indication CFI = 1, meaning the UE does not want to receive a dynamic indication CFI = 2. At this time, the non MBSFN subframe is configured with TM2, and the MBSFN subframe is configured with TM9. The PDSCH transmitted in subslot #0 of MBSFN subframe #n+1 is still based on the CRS transmission mode, i.e., TM2. The PDSCH transmits data and does not need to transmit DMRS, using the CRS demodulated data in the MBSFN subframe. For example, when transmission is repeated three times using subslots #4 and #5 of subframe #n and subslot #1 of subframe #n+1 respectively, subslot #0 of subframe #n+1 becomes unavailable. This means the configured CFI is 2. Based on the configured CFI value, the terminal determines that subslot #0 in the corresponding sTTI Pattern cannot be used for service transmission. In this case, the non-MBSFN subframe is configured with TM2, and the MBSFN subframe is configured with TM9. The PDSCH transmitted in subslot #1 of MBSFN subframe #n+1 still uses the CRS transmission mode (TM2). The PDSCH transmits data without needing to transmit DMRS, using the CRS demodulated data from the MBSFN subframe.

[0060] This embodiment is not limited to downlink service channels in an LTE system. For example, when PDSCH or PUSCH retransmissions span subframe or slot boundaries, and the first transmission in the retransmission is located in subframe / slot#n and configured as transmission mode A, while some or all of the non-first transmissions in the retransmission are located in subframe / slot#n+1 and configured as transmission mode B, the service channel located in subframe / slot#n+1 still uses the same transmission mode A as the first transmission. Preferably, the service channel located in subframe / slot#n+1 does not need to transmit the reference signal required for transmission mode B. Preferably, the service channel located in subframe / slot#n+1 uses the reference signal required for transmission mode A when demodulating data.

[0061] The retransmission method described in this embodiment ensures successful reception of retransmissions even when the subframe type changes and dynamic scheduling information is lacking, by determining how to ensure that retransmissions can still be successfully received when cross-subframe boundaries are allowed. This enables unambiguous transmission between the base station and the terminal, ensuring that retransmissions can meet the low latency and high reliability requirements of URLLC and guaranteeing the correctness of retransmission merging and demodulation.

[0062] Implementation Method 3

[0063] Short TTI is divided in the subframe as follows: Figure 3 As shown, Pattern 1 is used when CFI = 1 or 3, and Pattern 2 is used when CFI = 2. However, when supporting URLLC, the insufficient reliability of the PCFICH channel may lead to CFI detection errors. Therefore, the CFI value is determined through RRC configuration. PDSCH supports repetition at the granularity of sTTI to support URLLC requirements. The (S)PDCCH scheduled for this process is not retransmitted. However, except for the first repetition, each subsequent repetition may or may not send (S)PDCCH. The DCI information carried by (S)PDCCH includes a repetition count indication. For example, taking 3 repetitions as an example, the first PDSCH transmission in the repetition process is indicated by (S)PDCCH with a repetition count k = 3. The terminal detects the (S)PDCCH and receives the merged PDSCH within 3 sTTIs. If the (S)PDCCH of the first PDSCH transmission is not detected, the (S)PDCCH will continue to be detected in the second transmission. At this time, the number of PDSCH repetitions k=2 is indicated. The terminal detects the (S)PDCCH and receives the merged PDSCH in 2 sTTIs.

[0064] When retransmission supports RV cycling, the RV pattern is used sequentially and cyclically according to the preset or configured RV pattern and the current RV version indicated by the PDCCH. For example, if the configured RV pattern is {0,2,3,1}, the current indicated RV version is RV3, and the retransmission is repeated 4 times, then each transmission uses RV3, 1, 0, and 2 respectively. However, due to the low latency and high reliability requirements of URLLC, since RV0 has more system bit information, having RV0 during merging and decoding provides higher reliability than not having RV0. Therefore, for the above retransmission method, that is, except for the first retransmission, each subsequent retransmission can send (S)PDCCH or not, it is necessary to ensure that RV0 can always be used by the UE for merging and decoding in the retransmission. Therefore, it is necessary to ensure that the last retransmission is RV0. The problem to be solved here is: how to support RV cycling in retransmission and how to indicate RV, and how to ensure that RV0 is at the end. If this is not solved, the terminal merging and decoding cannot guarantee that RV0 is always present, and the optimal reliability cannot be guaranteed.

[0065] To address the aforementioned issues, the present invention employs one of the following methods: where P represents the number of repeated transmissions, and k represents each transmission in the repeated transmissions. This primarily targets a maximum of 3 repeated transmissions (where the URLLC requirement is a user plane latency of no more than 1ms and a reliability requirement of 99.999%). k=4 can be used in URLLC scenarios with latency greater than 1ms. If the number of repetitions P=1, then it is a single transmission; that is, one interpretation is that high reliability is not required at this time, so RV can be arbitrarily indicated, and RV0 is not always necessary.

[0066] Method 1. Determine the RV pattern based on the number of repetitions. That is, preset or configure the RVPattern for different numbers of repetitions.

[0067] For P = 3, 2, 1, the values ​​are {x, y, 0}, {y, 0}, and {0}, respectively, for example: {2, 3, 0}, {3, 0}, and {0}.

[0068] When P=1 and k=1, it indicates RV0 or any RV;

[0069] When P=2 and k=2, it indicates RV3; when k=1, it indicates RV0.

[0070] When P=3 and k=3, it indicates RV2; when k=2, it indicates RV3; when k=1, it indicates RV0.

[0071] If we consider P=4, then the pattern is {x,y,z,0}. When k=4, 3, 2, 1, it indicates RV x, y, z, 0 respectively. For example, x=2, y=3, z=1.

[0072] Method 2. Flexible pattern: For a maximum of 3 repeated transmissions, the RRC or the preset set of up to 3 RV versions is used, and the dynamic RV indicator is indicated within this set. Since the last transmission is RV0, k=3 indicates an RV version other than RV0, and k=2 can only uniquely indicate an RV version different from the ones when k=3 and k=1.

[0073] When P=1 and k=1, it indicates RV0 or any RV;

[0074] When P=2 and k=2, it indicates any RV other than RV0; when k=1, it indicates RV0.

[0075] When P=3 and k=3, it indicates any RV other than RV0; when k=2, it indicates an RV different from k=3 and different from RV0; when k=1, it indicates RV0.

[0076] For example: The RRC configuration uses three RV versions that are used repeatedly three times as {0,1,3}. When k=3 indicates RV1, k=2 can only indicate RV3, and k=3 indicates RV0; or k=3 indicates RV3, k=2 can only indicate RV1, and k=3 indicates RV0.

[0077] The characteristic of this pattern is that the RV pattern is not fixed, but the total number of RV versions used is fixed.

[0078] If we consider P=4, then we need to fix two of the RV versions, with the last one, RV0, needing to be fixed again. For example: if we fix the last one as RV0 and the second-to-last one as RV3, then k=4 can flexibly notify RV1 or RV2, k=3 can notify RVs different from the first and last two, and k=2 and k=1 can notify RV3 and RV0 respectively.

[0079] Method 3. Indicate any starting RV and use it cyclically. If the last transmission is not RV0, then force a conversion to RV0. For example, taking the RV pattern as {0,2,3,1}, to ensure RV0 is always at the end, P=3 is shown in Table 1, and P=4 is shown in Table 2. Taking Case 1 with P=3 as an example, if RV0 is indicated initially, the three transmissions according to the {0,2,3,1} pattern should be RV0, RV2, and RV3 respectively. However, if the last transmission is not RV0, then it is forcibly converted to RV0. That is, the final determined RVs for the three repeated transmissions are RV0, RV2, and RV0 respectively. The other cases are similar and will not be elaborated further.

[0080] Table 1, RV when P=3

[0081]

[0082]

[0083] Table 2, RV when P=4

[0084] Case 1 RV0 RV2 RV3 RV0 Case 2 RV2 RV3 RV1 RV0 Case 3 RV3 RV1 RV0 RV0 Case 4 RV1 RV0 RV2 RV0

[0085] As you can see, this method only needs to define one table, P=4, because it includes all cases where P=3, and similarly, it also includes the case where P=2. Here, we take the pattern {0,2,3,1} as an example. Other patterns are similar, such as {0,3,0,3}, {0,0,0,0}, etc.

[0086] Method 4: The RV field indicates the pattern, not the RV version of the current TTI. In this case, the RV index indicated by different transmission counts k in the same repeated transmission P is the same. The RV version of the current TTI is determined by combining the notified k value. Taking Table 3 as an example, the 2-bit RV field indicates four patterns respectively, where 00 represents {0,0,0,0}, 01 represents {2,3,1,0}, 10 represents {3,0,3,0}, and 11 represents reserved or {3,1,2,0}. When the same repeated transmission uses the RV pattern {2,3,1,0}, then k=3 in P=3 indicates that the RV field is 01, that is, the RV pattern is {2,3,1,0} and RV3 is used for the first time; if (S)PDCCH is also sent when k=2, then the RV field is also 01 at this time, that is, the RV pattern is {2,3,1,0}, and combined with k=2 at this time, it is determined that the current TTI uses RV1; the rest will not be elaborated.

[0087] Table 3, RV domain

[0088] 00 RV0 RV0 RV0 RV0 01 RV2 RV3 RV1 RV0 10 RV3 RV0 RV3 RV0 11 (Alternatively, the pattern can be omitted and left as reserved) RV3 RV1 RV2 RV0

[0089] In this case, for methods 1-3, the 2-bit RV is different in the DCI of each PDCCH in the PDSCH retransmission, while in method 4, the 2-bit RV is the same in the DCI of each PDCCH in the PDSCH retransmission.

[0090] By using the repetitive transmission method described in this embodiment, and by determining the RV Pattern and indication scheme to ensure that RV0 is always received when supporting RV cycling, unambiguous transmission can be achieved on both the base station and the terminal side. This ensures that repetitive transmission can meet the low latency and high reliability requirements of URLLC, guarantee that RV0 is always used, and improve the probability of correct decoding.

[0091] Example 4

[0092] Embodiments of the present invention also provide a storage medium storing a computer program, wherein the computer program is configured to execute the steps in any of the above method embodiments when running.

[0093] Optionally, in this embodiment, the storage medium may be configured to store a computer program for performing the following steps:

[0094] S1, data is repeatedly transmitted using a first transmission time interval, wherein the repeated transmission is located in one or more second transmission time intervals, the second transmission time intervals comprising a plurality of the first transmission time intervals.

[0095] Optionally, in this embodiment, the storage medium may include, but is not limited to, various media capable of storing computer programs, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0096] Embodiments of the present invention also provide an electronic device including a memory and a processor, the memory storing a computer program and the processor being configured to run the computer program to perform the steps in any of the above method embodiments.

[0097] Optionally, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor and the input / output device is connected to the processor.

[0098] Optionally, in this embodiment, the processor can be configured to perform the following steps via a computer program:

[0099] S1, data is repeatedly transmitted using a first transmission time interval, wherein the repeated transmission is located in one or more second transmission time intervals, the second transmission time intervals comprising a plurality of the first transmission time intervals.

[0100] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementations, and will not be repeated here.

[0101] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. Optionally, they can be implemented using computer-executable program code, thereby storing them in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those presented herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0102] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A transmission method, characterized by, include: The communication node repeatedly transmits data using a first transmission time interval, wherein the repeated transmission is located within one or more second transmission time intervals, and the second transmission time intervals include a plurality of the first transmission time intervals; When the repeated transmission is located in multiple second transmission time intervals, and the second transmission time interval is a subframe, the first transmission of the repeated transmission is located in non-MBSFN subframe n and configured as a transmission mode based on cell proprietary reference signal CRS; some or all of the non-first transmissions in the repeated transmission are located in subframe n+1 and are MBSFN subframes and configured as a transmission mode based on user proprietary reference signal DMRS, wherein the physical downlink shared channel PDSCH located in subframe n+1 uses the same transmission mode as subframe n, where n is an integer not less than 0.

2. The method of claim 1, wherein, When the repeated transmission is located within a plurality of second transmission time intervals, the first first transmission time interval, which is not the first second transmission time interval among the plurality of second transmission time intervals, is used to transmit data.

3. The method of claim 2, wherein, The conditions for the first transmission time interval in the second transmission time interval to transmit data include one of the following: semi-static configuration control format indicator CFI=1 and dynamic indicator CFI=1; semi-static configuration CFI=1 and the terminal does not want to receive dynamic indicator CFI=2 or 3.

4. The method according to claim 1 or 2, characterized in that, When the repeated transmission is located within multiple second transmission time intervals, and the second transmission time interval is a subframe, the m-th transmission in the repeated transmission is located in non-MBSFN subframe n and configured as a transmission mode based on cell proprietary reference signal CRS; the (m+1)-th transmission in the repeated transmission is located in subframe n+1 and is an MBSFN subframe and configured as a transmission mode based on user proprietary reference signal DMRS, wherein the physical downlink shared channel (PDSCH) located in subframe n+1 uses the same transmission mode as subframe n, where n is an integer not less than 0 and m is a natural number.

5. The method of claim 4, wherein, The PDSCH in subframe n+1 is mapped to the RE used by DMRS contained in the allocated resource area.

6. The method of claim 4, wherein, In subframe n+1, the PDSCH in the MBSFN subframe is demodulated using the CRS in the previous one or two symbols of the MBSFN subframe.

7. The method of claim 1, wherein, Before the communication node repeatedly transmits data using the first transmission time interval, the method further includes: The redundant version pattern (RV Pattern) used for the repeated transmission is determined by one of the following methods: The RV Pattern is preset or configured according to the number of repetitions; A set of P RV versions that are preset or configured for use, wherein the RV field in the downlink control information (DCI) is indicated in the set of RV versions; A preset or configured RV Pattern is used to dynamically indicate the starting RV. The starting RV is used cyclically. When the last RV with k=1 after P repeated transmissions is not RV X, a forced conversion to RV X is performed, where X is a preset or configured value and takes one of {0, 1, 2, 3}. Based on the RV Pattern indicated by the RV field in the DCI, the RV version of the current transmission time interval TTI is determined in combination with the k value of the notification, wherein the RV indication is the same for different transmission counts k in the same repeated transmission P; Where 1≤k≤P, P represents the number of repeated transmissions, and P is a positive integer greater than 1.

8. The method of claim 7, wherein, The last RV version in the RV Pattern is RV0.

9. A transmitting device, characterized by include: A transmission module is configured to repeatedly transmit data using a first transmission time interval, wherein the repeated transmission is located within one or more second transmission time intervals, the second transmission time intervals comprising multiple first transmission time intervals; when the repeated transmission is located within multiple second transmission time intervals, and the second transmission time interval is a subframe, the first transmission of the repeated transmission is located in a non-MBSFN subframe n and configured in a transmission mode based on a cell proprietary reference signal (CRS); some or all of the non-first transmissions in the repeated transmission are located in subframe n+1, which is an MBSFN subframe and configured in a transmission mode based on a user proprietary reference signal (DMRS), wherein the Physical Downlink Shared Channel (PDSCH) located in subframe n+1 uses the same transmission mode as subframe n, where n is an integer not less than 0.

10. A storage medium, characterized by The storage medium stores a computer program, wherein the computer program is configured to execute the method described in any one of claims 1 to 8 when it is run. 11.An electronic device comprising a memory and a processor, the electronic device characterized by, The memory stores a computer program, and the processor is configured to run the computer program to perform the method as described in any one of claims 1 to 8.

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