CN112787749B

CN112787749B - Data retransmission method, device, terminal, base station and storage medium

Info

Publication number: CN112787749B
Application number: CN201911088696.7A
Authority: CN
Inventors: 白伟; 高雪娟; 邢艳萍
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2022-05-10
Anticipated expiration: 2039-11-08
Also published as: CN112787749A

Abstract

The embodiment of the invention provides a data retransmission method, a device, a terminal, a base station and a storage medium, wherein the method comprises the following steps: if receiving a retransmission scheduling signaling corresponding to the fallback DCI format, determining the repeated transmission times based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information; wherein the retransmission scheduling signaling indicates data retransmission based on dynamic scheduling; the initial data transmission is realized based on uplink configuration permission scheduling or downlink semi-persistent scheduling; performing data retransmission based on the number of repeated transmissions. The method, the device, the terminal, the base station and the storage medium provided by the embodiment of the invention determine the repeated transmission times based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information when carrying out retransmission scheduling based on the backspacing DCI format, and effectively ensure the reliability of data retransmission on the premise of not additionally increasing signaling overhead, thereby ensuring the reliability of URLLC service.

Description

Data retransmission method, device, terminal, base station and storage medium

Technical Field

The present invention relates to the field of wireless communications technologies, and in particular, to a data retransmission method, apparatus, terminal, base station, and storage medium.

Background

In a 5G NR (5Generation New RAT) system, under a URLLC (ultra-high reliable and low-latency communication) application scenario, service data supported in the NR (New RAT) standard is initially transmitted by using uplink configuration grant scheduling or downlink semi-persistent scheduling, and is retransmitted by using dynamic scheduling.

In the dynamic scheduling of data retransmission, the number of times of the default repeated transmission of the fallback DCI format is 1, which greatly affects the reliability of the URLLC service. Retransmission scheduling can be performed only by continuously adopting a fallback DCI format for multiple times, or indication of the number of times of repeated transmission is realized by adopting a non-fallback DCI format, but continuous retransmission scheduling for multiple times can cause huge signaling overhead, and the non-fallback DCI format is not suitable for the RRC reconfiguration period.

Disclosure of Invention

Embodiments of the present invention provide a data retransmission method, apparatus, terminal, base station, and storage medium, to solve the problem that reliability of a URLLC service is affected because the number of times of retransmission is defaulted to 1 in an existing fallback DCI format.

In a first aspect, an embodiment of the present invention provides a data retransmission method, including:

if receiving a retransmission scheduling signaling corresponding to the fallback DCI format, determining the repeated transmission times based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information; wherein the retransmission scheduling signaling indicates data retransmission based on dynamic scheduling; the initial data transmission is realized based on uplink configuration permission scheduling or downlink semi-persistent scheduling;

performing data retransmission based on the number of repeated transmissions.

Preferably, when the fallback DCI format is DCI format0_ 0,

the determining the number of repeated transmissions based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information specifically includes:

determining the number of repeated transmission times based on the uplink configuration permission scheduling configuration information;

the performing data retransmission based on the number of repeated transmissions specifically includes:

and sending the retransmitted uplink data based on the repeated transmission times.

Preferably, when the fallback DCI format is DCI format 1_0,

determining the repeated transmission times based on the downlink semi-persistent scheduling configuration information;

the performing data retransmission based on the number of times of the repeated transmission specifically includes:

and receiving the retransmitted downlink data based on the repeated transmission times.

Preferably, the performing data retransmission based on the number of times of the repeated transmission specifically includes:

and executing data retransmission based on the repeated transmission times, the dynamic scheduling configuration information, the retransmission scheduling signaling and the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information.

In a second aspect, an embodiment of the present invention provides a data retransmission method, including:

if a retransmission scheduling signaling corresponding to the fallback DCI format is issued, determining the repeated transmission times based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information; wherein the retransmission scheduling signaling indicates data retransmission based on dynamic scheduling; the initial data transmission is realized based on uplink configuration permission scheduling or downlink semi-persistent scheduling;

performing data retransmission based on the number of repeated transmissions.

Preferably, when the fallback DCI format is DCI format0_ 0,

and receiving the retransmitted uplink data based on the repeated transmission times.

Preferably, when the fallback DCI format is DCI format 1_0,

and sending the retransmitted downlink data based on the repeated transmission times.

and executing data retransmission based on the repeated transmission times dynamic scheduling configuration information, the retransmission scheduling signaling and the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information.

In a third aspect, an embodiment of the present invention provides a data retransmission apparatus, including:

a retransmission scheduling receiving unit, configured to determine a number of times of retransmission based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information if a retransmission scheduling signaling corresponding to the fallback DCI format is received; wherein the retransmission scheduling signaling indicates data retransmission based on dynamic scheduling; the initial data transmission is realized based on uplink configuration permission scheduling or downlink semi-persistent scheduling;

a first retransmission execution unit configured to execute data retransmission based on the number of times of retransmission.

In a fourth aspect, an embodiment of the present invention provides a data retransmission apparatus, including:

a retransmission scheduling issuing unit, configured to determine a number of repeated transmissions based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information if a retransmission scheduling signaling corresponding to the fallback DCI format is issued; wherein the retransmission scheduling signaling indicates data retransmission based on dynamic scheduling; the initial data transmission is realized based on uplink configuration permission scheduling or downlink semi-persistent scheduling;

a second retransmission execution unit configured to execute data retransmission based on the number of times of retransmission.

In a fifth aspect, an embodiment of the present invention provides a terminal, including a memory, a processor, and a program stored in the memory and capable of running on the processor, where the processor implements the following steps when executing the program:

if receiving a retransmission scheduling signaling corresponding to a fallback DCI format, determining the number of repeated transmission times based on uplink configuration permission scheduling configuration information or downlink semi-persistent scheduling configuration information; wherein the retransmission scheduling signaling indicates data retransmission based on dynamic scheduling; the initial data transmission is realized based on uplink configuration permission scheduling or downlink semi-persistent scheduling;

performing data retransmission based on the number of repeated transmissions.

In a sixth aspect, an embodiment of the present invention provides a base station, including a memory, a processor, and a program stored in the memory and executable on the processor, where the processor executes the program to implement the following steps:

performing data retransmission based on the number of repeated transmissions.

In a seventh aspect, an embodiment of the present invention provides a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of the method as provided in the first or second aspect.

According to the data retransmission method, the data retransmission device, the terminal, the base station and the storage medium provided by the embodiment of the invention, when retransmission scheduling is carried out based on the backspacing DCI format, the repeated transmission times are determined based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information, and the reliability of data retransmission is effectively ensured on the premise of not additionally increasing signaling overhead, so that the reliability of URLLC service is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 is a schematic diagram illustrating an uplink data transmission flow for scheduling uplink configuration permission in the prior art;

fig. 2 is a schematic flowchart of a data retransmission method according to an embodiment of the present invention;

fig. 3 is a flowchart illustrating a data retransmission method according to another embodiment of the present invention;

fig. 4 is a schematic structural diagram of a data retransmission apparatus according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a data retransmission apparatus according to another embodiment of the present invention;

fig. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

With the development of mobile communication service demand, a New wireless communication system 5G NR (5Generation New RAT) is in force. In the 5G NR system, an important requirement is low-delay and high-reliability communication, resulting in a URLLC and other transmission schemes.

For URLLC traffic, in the NR standard, a dynamic scheduling scheme is supported. In the Uplink dynamic scheduling scheme, the gbb (5G base station) first configures transmission of a PUSCH (Physical Uplink Shared Channel) by using RRC (Radio Resource Control ) signaling PUSCH-configuration, and then the gbb schedules the UE (User Equipment, terminal) by using a PDCCH (Physical Downlink Control Channel) to perform PUSCH transmission according to configuration parameters in the PDCCH and configuration parameters in the PUSCH-configuration. In the Downlink dynamic scheduling scheme, the gNB configures transmission of a PDSCH (Physical Downlink Shared Channel) by using RRC signaling PDSCH-Config, and then schedules the UE to perform PDSCH transmission according to the configuration parameters in the PDCCH and the configuration parameters in the PDSCH-Config through the PDCCH.

For URLLC service, in NR standard, an uplink configuration permission scheduling scheme is supported to reduce air interface transmission delay. In the uplink configuration grant scheduling scheme, the gNB configures transmission of the PUSCH by using RRC signaling ConfiguredGrantConfig, and after the uplink configuration grant scheduling transmission is activated, the UE performs PUSCH transmission according to configuration parameters in the ConfiguredGrantConfig and configuration parameters in an activation signaling (only configuration grant scheduling is configured for type 2).

For URLLC service, in NR standard, a downlink semi-persistent scheduling scheme is supported. In the downlink semi-persistent scheduling scheme, the gNB firstly uses the downlink semi-persistent scheduling configuration information carried in the RRC signaling to configure the transmission of the PDSCH, and after the downlink semi-persistent scheduling transmission is activated, the UE performs the PDSCH transmission according to the configuration parameters in the downlink semi-persistent scheduling configuration information and the configuration parameters in the activation signaling.

For URLLC service, when the gNB needs the UE to retransmit PUSCH or PDSCH, the gNB performs dynamic scheduling through PDCCH. Taking retransmission of the PUSCH as an example, when the initial transmission uses an uplink configuration permission scheduling scheme, the PUSCH transmission uses configuration parameters in ConfiguredGrantConfig; when the same data is retransmitted by using dynamic scheduling, the PUSCH transmission mainly uses the configuration parameters in the PUSCH-Config, except for the power control, the MCS table, and the waveform parameters, by using the configuration parameters in the ConfiguredGrantConfig. In general, the configuration parameters in the ConfiguredGrantConfig and the configuration parameters in the PUSCH-Config may cause different performances such as reliability and delay of the PUSCH, and may even cause a conflict.

Here, the UE determines to perform uplink transmission on resources allocated in higher layer signaling (and active signaling) without transmitting a scheduling request to the base station and waiting for a PDCCH indication from the base station, i.e., before uplink transmission. Fig. 1 is a schematic diagram illustrating an uplink Data transmission process for configuring an uplink grant scheduling in the prior art, for example, in fig. 1, Configuration for Configured grant is RRC signaling carrying uplink Configuration grant scheduling Configuration information, and Configured grant Data is uplink Data transmitted based on the uplink Configuration grant scheduling scheme.

In the scheme of performing initial transmission of uplink data by adopting uplink configuration permission scheduling and performing retransmission of the uplink data by dynamic scheduling, the initial transmission mainly adopts parameters configured in the ConfiguredGrantConfig and parameters indicated by an activation signaling, and the retransmission mainly adopts parameters configured in the pusch-Config and parameters indicated by a PDCCH retransmission scheduling signaling. During retransmission, if the fallback DCI format is used for dynamic scheduling, since the fallback DCI format does not support dynamic indication of the number of repeated transmissions, nor does it support obtaining the number of repeated transmissions from the parameter of the pusch-Config, the number of repeated transmissions can only be defaulted to 1, which greatly affects the reliability of the URLLC service.

In order to solve the problem, two methods exist at present, one method is retransmission scheduling for multiple times continuously, but huge signaling overhead of a backspacing DCI format is brought, and the method is contradictory to the original intention of adopting the backspacing DCI format for scheduling to save the signaling overhead; another method is to avoid using a fallback DCI format for scheduling, but use a non-fallback DCI format, where the non-fallback DCI format, for example, DCI format0_1/0_2, can dynamically indicate the number of times of repeated transmission through the SLIV parameter, but in the RRC updating process, the RRC parameter is not available, and at this time, the non-fallback DCI format is not available, but only the fallback DCI format is used.

The above problems also exist in the scheme of performing downlink data initial transmission by using downlink semi-persistent scheduling and performing downlink data retransmission by using dynamic scheduling. In view of this, an embodiment of the present invention provides a data retransmission method to solve the problem that the reliability of the URLLC service is affected when a fallback DCI is used to perform retransmission scheduling, and the number of times of the default retransmission is 1.

Fig. 2 is a schematic flowchart of a data retransmission method according to an embodiment of the present invention, and as shown in fig. 2, an execution subject of the method is a terminal, and the terminal is a user equipment with a wireless communication function, such as a handheld device, a vehicle-mounted device, a wearable device, and the like. The method is applied to the scene of performing data initial transmission by adopting uplink configuration permission scheduling or downlink semi-persistent scheduling and performing data retransmission by adopting dynamic scheduling. The method comprises the following steps:

step 210, if receiving a retransmission scheduling signaling corresponding to the fallback DCI format, determining a number of repeated transmissions based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information; wherein the retransmission scheduling signaling indicates data retransmission based on dynamic scheduling; the initial data transmission is realized based on uplink configuration permission scheduling or downlink semi-persistent scheduling.

Specifically, the uplink configuration permission scheduling configuration information is configuration information corresponding to the uplink configuration permission scheduling, and the uplink configuration permission scheduling configuration information is determined in advance by the base station and is issued to the terminal through an RRC signaling. Before performing uplink data transmission, the terminal stores uplink configuration permission scheduling configuration information in advance.

The downlink semi-persistent scheduling configuration information is configuration information corresponding to downlink semi-persistent scheduling, and the downlink semi-persistent scheduling configuration information is determined in advance by the base station and is issued to the terminal through RRC signaling. Before executing the data transmission, the terminal stores the downlink semi-persistent scheduling configuration information in advance.

The retransmission scheduling signaling is PDCCH signaling which is issued by the base station to the terminal for indicating dynamic scheduling, and the retransmission scheduling signaling may correspond to a fallback DCI format or a non-fallback DCI format. Here, the fallback DCI format includes DCI format0_ 0 and DCI format 1_0, where DCI format0_ 0 is used to schedule PUSCH, DCI format 1_0 is used to schedule PDSCH, and neither DCI format0_ 0 nor DCI format 1_0 supports dynamic indication of the number of repeated transmissions, nor does it support obtaining the number of repeated transmissions from the parameter of the dynamic scheduling configuration information, and the default number of repeated transmissions is 1.

In the data transmission process, if the terminal receives the retransmission scheduling signaling and judges that the retransmission scheduling signaling corresponds to the backspacing DCI format, the repeated transmission times are determined based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information. Further, if the retransmission scheduling signaling indicates uplink data retransmission, extracting a corresponding parameter from the uplink configuration permission scheduling configuration information as the number of repeated transmissions, and if the retransmission scheduling signaling indicates downlink data retransmission, extracting a corresponding parameter from the downlink semi-persistent scheduling configuration information as the number of repeated transmissions.

Based on the number of retransmissions, a data retransmission is performed, step 220.

Specifically, after determining the number of repeated transmissions based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information, the terminal performs data retransmission based on the number of repeated transmissions. Further, if the retransmission scheduling signaling indicates uplink data retransmission, the terminal transmits the retransmitted uplink data based on the number of repeated transmissions, and if the retransmission scheduling signaling indicates downlink data retransmission, the terminal receives the retransmitted downlink data based on the number of repeated transmissions.

The method provided by the embodiment of the invention determines the repeated transmission times based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information when carrying out retransmission scheduling based on the backspacing DCI format, and effectively ensures the reliability of data retransmission on the premise of not additionally increasing signaling overhead, thereby ensuring the reliability of URLLC service.

Based on the foregoing embodiment, in the method, when the fallback DCI format is DCI format0_ 0, step 210 specifically includes: determining the number of repeated transmission times based on the uplink configuration permission scheduling configuration information; step 220 specifically includes: and transmitting the retransmitted uplink data based on the repeated transmission times.

Specifically, if the received retransmission scheduling signaling corresponds to DCI format0_ 0, the retransmission scheduling information indicates uplink data retransmission, and the terminal extracts the number of times of retransmission from the uplink configuration permission scheduling configuration information and transmits the retransmitted uplink data based on the number of times of retransmission.

Further, the uplink configuration permission scheduling configuration information, i.e., ConfiguredGrantConfig, main parameters in the ConfiguredGrantConfig are shown in table 1. As can be seen from the descriptions of the fields in table 1, repK in the ConfiguredGrantConfig indicates the number of repetitions K, and in the embodiment of the present invention, when the retransmission scheduling signaling corresponds to DCI format0_ 0, the number of repetitions K corresponding to repK in the ConfiguredGrantConfig is used as the number of repetitions.

Table 1: ConfiguredGrantConfig field description

According to the method provided by the embodiment of the invention, when the retransmission scheduling signaling corresponds to the DCI format0_ 0, the repeated transmission times are determined based on the uplink configuration permission scheduling configuration information, so that the reliability of uplink data retransmission is effectively ensured.

Based on any of the above embodiments, in the method, when the fallback DCI format is DCI format 1_0, step 210 specifically includes: determining the repeated transmission times based on the downlink semi-persistent scheduling configuration information; step 220 specifically includes: and receiving the retransmitted downlink data based on the repeated transmission times.

Specifically, if the received retransmission scheduling signaling corresponds to DCI format 1_0, the retransmission scheduling information indicates downlink data retransmission, and the terminal extracts the number of repeated transmissions from the downlink semi-persistent scheduling configuration information and receives the retransmitted downlink data based on the number of repeated transmissions.

According to the method provided by the embodiment of the invention, when the retransmission scheduling signaling corresponds to the DCI format 1_0, the repeated transmission times are determined based on the downlink semi-persistent scheduling configuration information, so that the reliability of downlink data retransmission is effectively ensured.

Based on any of the above embodiments, in the method, step 220 specifically includes: and performing data retransmission based on the repeated transmission times, the dynamic scheduling configuration information and the retransmission scheduling signaling, and the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information.

Specifically, the dynamic scheduling configuration information is configuration information corresponding to dynamic scheduling, and the dynamic scheduling configuration information is determined in advance by the base station and is issued to the terminal through an RRC signaling. Before performing data retransmission, the terminal stores dynamic scheduling configuration information in advance.

When data retransmission is performed for the retransmission scheduling signaling corresponding to the fallback DCI format, in addition to applying the number of repeated transmissions determined based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information, the dynamic scheduling configuration information and the retransmission scheduling information, and the remaining retransmission parameters indicated in the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information need to be applied.

For example, when uplink data retransmission is performed, in addition to applying the number of times of retransmission determined based on the repK in the ConfiguredGrantConfig, power control, MCS table, waveform parameters in the ConfiguredGrantConfig, parameters configured in the dynamic scheduling configuration information pusch-Config, and parameters indicated by the retransmission scheduling signaling need to be applied.

Based on any of the above embodiments, fig. 3 is a schematic flow chart of a data retransmission method according to another embodiment of the present invention, as shown in fig. 3, an execution subject of the method may be a base station, and the method specifically includes:

step 310, if a retransmission scheduling signaling corresponding to the fallback DCI format is issued, determining the number of repeated transmissions based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information; wherein the retransmission scheduling signaling indicates data retransmission based on dynamic scheduling; the initial data transmission is realized based on uplink configuration permission scheduling or downlink semi-persistent scheduling.

Specifically, the uplink configuration permission scheduling configuration information, that is, the configuration information corresponding to the uplink configuration permission scheduling, is determined in advance by the terminal before performing uplink data transmission, and is sent to the terminal through an RRC signaling. The base station determines the configuration information of the downlink semi-persistent scheduling in advance before executing the downlink data transmission, and sends the configuration information of the downlink semi-persistent scheduling to the terminal through an RRC signaling.

In the data transmission process, if the base station issues a retransmission scheduling signaling corresponding to the fallback DCI format, the number of times of repeated transmission is determined based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information. Further, if the retransmission scheduling signaling indicates uplink data retransmission, extracting a corresponding parameter from the uplink configuration permission scheduling configuration information as the number of repeated transmissions, and if the retransmission scheduling signaling indicates downlink data retransmission, extracting a corresponding parameter from the downlink semi-persistent scheduling configuration information as the number of repeated transmissions.

At step 320, data retransmission is performed based on the number of retransmissions.

Specifically, after determining the number of repeated transmissions based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information, the base station performs data retransmission based on the number of repeated transmissions. Further, if the retransmission scheduling signaling indicates uplink data retransmission, the base station receives the retransmitted uplink data based on the number of repeated transmissions, and if the retransmission scheduling signaling indicates downlink data retransmission, the base station transmits the retransmitted downlink data based on the number of repeated transmissions.

Based on any of the embodiments above, in the method, when the fallback DCI format is DCI format0_ 0, step 310 specifically includes: determining the number of repeated transmission times based on the uplink configuration permission scheduling configuration information; step 320 specifically includes: and receiving the retransmitted uplink data based on the repeated transmission times.

Specifically, if the retransmission scheduling signaling sent down corresponds to DCI format0_ 0, the retransmission scheduling information indicates uplink data retransmission, and the base station extracts the number of repeated transmissions from the uplink configuration permission scheduling configuration information and receives the retransmitted uplink data based on the number of repeated transmissions.

Further, referring to the descriptions of the fields in table 1, it can be seen that the uplink configuration grant scheduling configuration information, i.e., ConfiguredGrantConfig, in the embodiment of the present invention, when the retransmission scheduling signaling corresponds to DCI format0_ 0, the repetition number K corresponding to repK in ConfiguredGrantConfig is used as the retransmission number.

Based on any of the embodiments above, when the fallback DCI format is DCI format 1_0, step 310 specifically includes: determining the number of repeated transmission times based on the downlink semi-persistent scheduling configuration information; step 320 specifically includes: and sending the retransmitted downlink data based on the repeated transmission times.

Specifically, if the issued retransmission scheduling signaling corresponds to DCI format 1_0, the retransmission scheduling information indicates downlink data retransmission, and the base station correspondingly extracts the number of repeated transmissions from the downlink semi-persistent scheduling configuration information and transmits the retransmitted downlink data based on the number of repeated transmissions.

Based on any of the above embodiments, in the method, step 320 specifically includes: and performing data retransmission based on the repeated transmission times, the dynamic scheduling configuration information and the retransmission scheduling signaling, and the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information.

Specifically, the dynamic scheduling configuration information is configuration information corresponding to dynamic scheduling, and the base station determines the dynamic scheduling configuration information in advance before performing data retransmission and issues the dynamic scheduling configuration information to the terminal through an RRC signaling.

When data retransmission is performed for retransmission scheduling signaling corresponding to a fallback DCI format, in addition to applying the number of repeated transmissions determined based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information, it is necessary to apply the dynamic scheduling configuration information and the retransmission scheduling information, and the remaining retransmission parameters indicated in the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information.

Based on any of the above embodiments, a method for retransmitting uplink data specifically includes the following steps:

first, the base station determines uplink configuration permission scheduling configuration information configuredggrantconfig in advance, and issues the uplink configuration permission scheduling configuration information to the terminal through RRC signaling. In addition, the base station determines the dynamic scheduling configuration information pusch-Config in advance, and issues the dynamic scheduling configuration information to the terminal through an RRC signaling. Here, the ConfiguredGrantConfig includes a parameter repK indicating the number of times of retransmission, and the pusch-Config includes a parameter AggregationFactor indicating the number of times of retransmission.

The terminal receives RRC signaling configured by the base station and determines ConfigardGrantConfig and pusch-Config.

And when the PUSCH decoding is wrong, the base station issues the PDCCH of the DCI format0_ 0, schedules the terminal for retransmission, and determines the repeated transmission times based on a parameter repK in the configuredGrantConfig.

After receiving the PDCCH of the DCI format0_ 0, the terminal determines the retransmission times based on the parameter repK in the ConfiguredGrantConfig, and sends the retransmission times indication retransmitted uplink data on the scheduled resource.

And the base station receives the uplink data which is retransmitted by the repeated transmission times indication on the scheduled resources.

Based on any of the above embodiments, a downlink data retransmission method specifically includes the following steps:

firstly, the base station determines the downlink semi-persistent scheduling configuration information in advance, and issues the downlink semi-persistent scheduling configuration information to the terminal through RRC signaling. In addition, the base station determines the dynamic scheduling configuration information pdsch-Config in advance, and issues the dynamic scheduling configuration information to the terminal through an RRC signaling. Here, the downlink semi-persistent scheduling configuration information and the dynamic scheduling configuration information both include a parameter indicating the number of repeated transmissions.

And the terminal receives the RRC signaling configured by the base station and determines the downlink semi-persistent scheduling configuration information and the dynamic scheduling configuration information.

When the PDSCH decoding is wrong, the base station issues the PDCCH of the DCI format 1_0, dynamically schedules downlink data retransmission, determines the repeated transmission times based on the downlink semi-persistent scheduling configuration information, and sends the repeated transmission times to indicate the retransmitted downlink data on the scheduled resources.

After receiving the PDCCH of the DCI format 1_0, the terminal determines the repeated transmission times based on the downlink semi-persistent scheduling configuration information, and receives the downlink data which is retransmitted and indicated by the repeated transmission times on the scheduled resources.

Based on any of the above embodiments, an uplink data transmission method specifically includes the following steps:

(1) and the base station configures uplink configuration permission scheduling configuration information ConfigardGrantConfig required by the terminal, and issues the uplink configuration permission scheduling configuration information ConfigardConfig to the terminal through RRC signaling.

Here, the uplink configuration permission scheduling is specifically divided into a Type 1configured grant and a Type 2configured grant. The configurable GrantConfig RRC configuration signaling applies equally to Type 1configured grant and Type 2configured grant. For the configured grant PUSCH transmission of Type1, the configured GrantConfig includes parameters in the rrc-configured uplink Grant, and the terminal directly transmits when there is data to be transmitted according to the configuration, thereby reducing the time delay of uplink data. For the configured grant PUSCH transmission of Type2, the configured grant config does not include the parameter in the rrc-configured uplink grant, and the parameter in the rrc-configured uplink grant is issued to the terminal by the base station through the activation signaling.

For the multi-configuration case, there are multiple configuredgrantconfigs corresponding to multiple uplink configuration admission scheduling configurations.

(2) And the base station configures the dynamic scheduling information pusch-Config required by the terminal, and transmits the information to the terminal through RRC signaling for uplink dynamic scheduling.

The main parameters in the pusch-Config are shown in table 2. As can be seen from the description of the fields in table 2, the AggregationFactor in the PUSCH-Config indicates the PUSCH repetition number.

Table 2: pusch-Config field description

(3) And corresponding to the Type 2configured grant, the base station sends an activation signaling to the terminal.

(4) Corresponding to the Type 1configured grant, the terminal performs initial transmission of the PUSCH based on the ConfiguredGrantConfig, including determining the number of repeated transmissions of the uplink configuration grant scheduling corresponding to the Type1 based on a repK parameter in the ConfiguredGrantConfig;

corresponding to the Type 2configured grant, the terminal performs initial transmission of the PUSCH based on the configured grantconfig and the activation signaling, including determining the number of repeated transmissions of the uplink configuration grant scheduling corresponding to the Type2 based on the SLIV parameter in the activation signaling.

(5) And the base station uses the dynamic scheduling PDCCH to schedule the terminal to retransmit the PUSCH, and the terminal receives the dynamic scheduling PDCCH to retransmit the PUSCH.

Here, the PDCCH, that is, the retransmission scheduling signaling, is dynamically scheduled, and when the retransmission scheduling signaling corresponds to DCI format0_ 0, corresponding to Type 1configured grant or Type 2configured grant, the base station and the terminal each determine the number of repeated delivery of retransmissions based on a repK parameter in the configured grant config; when the retransmission scheduling signaling corresponds to the DCI format0_1 or 0_2, corresponding to the Type 1configured grant, the base station and the terminal respectively determine the repeated transmission times of the retransmission based on the parameter AggregationFactor in the pusch-configuration, and corresponding to the Type 2configured grant, the base station and the terminal respectively determine the repeated transmission times of the retransmission based on the parameter AggregationFactor in the pusch-configuration or the SLIV parameter in the retransmission scheduling PDCCH.

The method provided by the embodiment of the invention solves the problem of determining the repeated transmission times when the service data adopts initial transmission with configuration permission scheduling and retransmission with dynamic scheduling, and realizes the purpose of ensuring the reliability, time delay and other performances of PUSCH transmission no matter the initial transmission or the retransmission is carried out.

Based on any of the above embodiments, fig. 4 is a schematic structural diagram of a data retransmission apparatus according to an embodiment of the present invention, as shown in fig. 4, the apparatus includes a retransmission scheduling receiving unit 410 and a first retransmission executing unit 420;

wherein, the retransmission scheduling receiving unit 410 is configured to determine, if a retransmission scheduling signaling corresponding to the fallback DCI format is received, a number of times of retransmission based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information; wherein the retransmission scheduling signaling indicates data retransmission based on dynamic scheduling; the initial data transmission is realized based on uplink configuration permission scheduling or downlink semi-persistent scheduling;

the first retransmission performing unit 420 is configured to perform data retransmission based on the number of repeated transmissions.

The device provided by the embodiment of the invention determines the repeated transmission times based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information when carrying out retransmission scheduling based on the backspacing DCI format, and effectively ensures the reliability of data retransmission on the premise of not additionally increasing signaling overhead, thereby ensuring the reliability of URLLC service.

According to any of the above embodiments, when the fallback DCI format is DCI format0_ 0,

the retransmission scheduling receiving unit 410 is specifically configured to:

the first retransmission executing unit 420 is specifically configured to:

According to any of the above embodiments, when the fallback DCI format is DCI format 1_0,

the retransmission scheduling receiving unit 410 is specifically configured to:

the first retransmission executing unit 420 is specifically configured to:

Based on any of the above embodiments, the first retransmission performing unit 420 is specifically configured to:

Based on any of the above embodiments, fig. 5 is a schematic structural diagram of a data retransmission apparatus according to another embodiment of the present invention, as shown in fig. 5, the apparatus includes a retransmission scheduling issuing unit 510 and a second retransmission executing unit 520;

wherein, the retransmission scheduling issuing unit 510 is configured to determine the number of repeated transmissions based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information if issuing the retransmission scheduling signaling corresponding to the fallback DCI format; wherein the retransmission scheduling signaling indicates data retransmission based on dynamic scheduling; the initial data transmission is realized based on uplink configuration permission scheduling or downlink semi-persistent scheduling;

the second retransmission performing unit 520 is configured to perform data retransmission based on the number of repeated transmissions.

the retransmission scheduling issuing unit 510 is specifically configured to:

the second retransmission executing unit 520 is specifically configured to:

the retransmission scheduling issuing unit 510 is specifically configured to:

the second retransmission executing unit 520 is specifically configured to:

Based on any of the above embodiments, the second retransmission executing unit 520 is specifically configured to:

Fig. 6 is a schematic entity structure diagram of a terminal according to an embodiment of the present invention, and as shown in fig. 6, the terminal may include: a processor (processor)601, a communication Interface (Communications Interface)602, a memory (memory)603 and a communication bus 604, wherein the processor 601, the communication Interface 602 and the memory 603 complete communication with each other through the communication bus 604. The processor 601 may invoke a computer program stored on the memory 603 and executable on the processor 601 to perform the following steps:

performing data retransmission based on the number of repeated transmissions.

Optionally, when the fallback DCI format is DCI format0_ 0,

Optionally, when the fallback DCI format is DCI format 1_0,

Optionally, the performing data retransmission based on the number of times of the repeated transmission specifically includes:

It should be noted that, the terminal in this embodiment can implement all the method steps in the foregoing method embodiments and can achieve the same technical effects, and details of the same parts and the same technical effects in this embodiment as in the method embodiments are not repeated herein.

In addition, the logic instructions in the memory 603 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or make a contribution to the prior art, or may be implemented in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a terminal) to execute all or part of the steps of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

Fig. 7 is a schematic entity structure diagram of a base station according to an embodiment of the present invention, and as shown in fig. 7, the base station may include: a processor (processor)701, a communication Interface (Communications Interface)702, a memory (memory)703 and a communication bus 704, wherein the processor 701, the communication Interface 702 and the memory 703 complete communication with each other through the communication bus 704. The processor 701 may invoke a computer program stored on the memory 703 and executable on the processor 701 to perform the following steps:

performing data retransmission based on the number of repeated transmissions.

Optionally, when the fallback DCI format is DCI format0_ 0,

Optionally, when the fallback DCI format is DCI format 1_0,

It should be noted that, the base station in this embodiment can implement all the method steps in the foregoing method embodiments and can achieve the same technical effect, and details of the same parts and the same technical effects in this embodiment as in the method embodiments are not repeated herein.

In addition, the logic instructions in the memory 703 can be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or make a contribution to the prior art, or may be implemented in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

An embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the data retransmission method provided in the foregoing embodiments, and for example, the method includes: if receiving a retransmission scheduling signaling corresponding to the fallback DCI format, determining the repeated transmission times based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information; wherein the retransmission scheduling signaling indicates data retransmission based on dynamic scheduling; the initial data transmission is realized based on uplink configuration permission scheduling or downlink semi-persistent scheduling; performing data retransmission based on the number of repeated transmissions.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A method for retransmitting data, comprising:

performing data retransmission based on the number of repeated transmissions;

the determining the number of repeated transmissions based on the uplink configuration permission scheduling configuration information or the downlink semi-persistent scheduling configuration information includes:

if the retransmission scheduling signaling indicates uplink data retransmission, extracting a corresponding parameter from the uplink configuration permission scheduling configuration information as the repeated transmission times, and if the retransmission scheduling signaling indicates downlink data retransmission, extracting a corresponding parameter from the downlink semi-persistent scheduling configuration information as the repeated transmission times.

2. The data retransmission method according to claim 1, wherein when the fallback DCI format is DCI format0_ 0,

3. The data retransmission method according to claim 1, wherein when the fallback DCI format is DCI format 1_0,

4. The data retransmission method according to any one of claims 1 to 3, wherein the performing data retransmission based on the number of repeated transmissions specifically comprises:

5. A method for retransmitting data, comprising:

performing data retransmission based on the number of repeated transmissions;

6. The data retransmission method according to claim 5, wherein when the fallback DCI format is DCI format0_ 0,

7. The data retransmission method according to claim 5, wherein when the fallback DCI format is DCI format 1_0,

8. The data retransmission method according to any one of claims 5 to 7, wherein the performing data retransmission based on the number of repeated transmissions specifically comprises:

9. A data retransmission apparatus, comprising:

a first retransmission execution unit configured to execute data retransmission based on the number of times of retransmission;

10. A data retransmission apparatus, comprising:

a second retransmission execution unit configured to execute data retransmission based on the number of times of retransmission;

11. A terminal comprising a memory, a processor, and a program stored on the memory and executable on the processor, wherein the processor when executing the program performs the steps of:

performing data retransmission based on the number of repeated transmissions;

12. The terminal of claim 11, wherein when the fallback DCI format is DCI format0_ 0,

13. The terminal of claim 11, wherein when the fallback DCI format is DCI format 1_0,

14. The terminal according to any of claims 11 to 13, wherein the performing data retransmission based on the number of repeated transmissions specifically comprises:

15. A base station comprising a memory, a processor, and a program stored on the memory and executable on the processor, wherein the processor when executing the program performs the steps of:

performing data retransmission based on the number of repeated transmissions;

16. The base station of claim 15, wherein when the fallback DCI format is DCI format0_ 0,

17. The base station of claim 15, wherein when the fallback DCI format is DCI format 1_0,

18. The base station according to any of claims 15 to 17, wherein the performing data retransmission based on the number of repeated transmissions specifically comprises:

19. A non-transitory computer readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the data retransmission method according to any one of claims 1 to 8.