RU2778484C2 - Method for retransmission, and terminal device - Google Patents

Abstract

FIELD: wireless communication.

SUBSTANCE: invention relates to the field of wireless communication, in particular to a method for retransmission and a terminal device. By means of the terminal device, a transmission time unit is determined, used in the first transmission of data to be transmitted; by means of the terminal device, based on the determined transmission time unit and parameter Q, HARQ process of a hybrid automatic request for retransmission is determined, used for transmission of data to be transmitted, where Q is an integer more than or equal to 1; and, when retransmission of data to be transmitted is not stopped until the first specific transmission time unit after the determined transmission time unit, by means of the terminal device, starting from the determined transmission unit, one transmission of data to be transmitted is performed in each transmission time unit, using HARQ process until the last transmission of data to be transmitted is performed in the first specific transmission time unit, where a period, in which the specific transmission time unit appears in a time domain resource, is Q transmission time units.

EFFECT: increase in a coefficient of successful determination by a network device of HARQ process used in retransmissions.

23 cl, 19 dwg

Description

[0001] The present application claims priority under Patent Application No. 201710512296.9, filed with the China Patent Office on June 28, 2017, Patent Application No. 201710667487.2 filed with the China Patent Office on August 7, 2017 and Patent Application No. 201711209549.1 filed with the Chinese Patent Office on November 27, 2017, which are incorporated herein by reference in their entirety.

The field of technology to which the invention belongs

[0002] The present invention relates to the field of wireless communication and, in particular, to a retransmission method and a terminal device.

State of the art

[0003] The scenario of ultra-reliable communication with low latency (Ultra Reliability and Low Latency Communication, URLLC) is one of the application scenarios in 5G communication. In URLLC, both the reliability of the data transfer and the low latency function must be satisfied. In order to meet the requirement of low latency, a Grant-free transmission mechanism has been proposed, which is becoming a technology in 5G communication. In the permissionless transmission mechanism, when new data arrives, the terminal device does not need to request a resource from the base station, it directly sends the data to the base station using a pre-allocated resource. The base station receives, on a pre-allocated resource using a reception technique such as blind discovery, data that is sent by the terminal device using an unauthorized transmission mechanism. Data transmitted without permission is called data without permission, and a pre-allocated resource used for transmission without permission is called resource without permission.

[0004] In order to improve the reliability of transmission of data without permission, the terminal device can send data without permission to the base station using a retransmission technique. In the retransmission technology, a terminal device may repeatedly send a specific piece of data in K (K > 1) consecutive slots (slot) without waiting for any feedback such as NACK or scheduling information from the base station. As shown in FIG. 1, when a terminal device transmits data using a retransmission technique, the terminal device sends one Redundancy Version (RV) of data in each slot. Reservation versions sent to different slots can be the same or different.

[0005] To further improve the reliability of data transmission, the industry is studying the implementation of Hybrid Auto ReQuest (HARQ) technology, widely used in existing mobile communication systems (for example, in the system of long-term evolution (Long Term Evolution, LTE)) up to 5G communications. In HARQ technology, after the transmitting side initially transmits specific data in a specific slot or a plurality of consecutive slots, if the transmitting side receives an indication that is transmitted back by the receiving side that indicates that the data is not received correctly, the transmitting side retransmits the data redundancy reservation version so that the receiving side can receive and combine the retransmitted data and the originally transmitted data to improve the reliability of data transmission.

[0006] In order to implement the HARQ function, when retransmitting data, the terminal device needs to know about the originally transmitted data corresponding to the retransmitted data, and when receiving the retransmitted data, the base station also needs to know about the originally transmitted data corresponding to the retransmitted data. Thus, the originally transmitted data and the retransmitted data that is received can be combined to improve the reliability of the data transmission. Such a process is provided using the HARQ process. Specifically, upon receiving the retransmitted data, the base station also learns HARQ process information such as a process number (ID) corresponding to the retransmitted data, and then combines the retransmitted data with the buffered data in the buffer of the corresponding HARQ process.

[0007] In the non-granted transmission mechanism, the HARQ processes used in K transmissions when the terminal device transmits data using the retransmission technique are the same, and the HARQ process numbers of the HARQ processes used are determined based on the first transmission in the K transmissions. Therefore, when receiving data that is transmitted using the retransmission technique, the base station needs to detect the first transmission in the K transmissions and determine that the current transmission is the first transmission in order to determine the HARQ process numbers of the HARQ processes in use in the K transmissions.

[0008] Due to the uncertainty of the moment when data arrives at the terminal device, and due to the requirement of low latency in data transmission in the URLLC scenario, if there is an available resource without permission, after the data arrives, the terminal device sends data to the base station using the resource without permission as soon as possible. This means that the terminal device starts K data retransmissions in any slot with the configured resource without permission. For the terminal device and the base station, the starting locations of the retransmissions are not fixed and unpredictable. In this case, since the base station needs to determine, by detecting the first transmission in retransmissions, the HARQ process number used by the terminal apparatus to send data, after the base station does not detect and determine the first transmission, the base station cannot determine the HARQ process number used terminal device for sending data.

The essence of the invention

[0009] In view of this, the present application provides a retransmission method and a terminal device to increase the success rate of a network device in determining the HARQ process used in retransmissions.

[0010] According to a first aspect, the present application provides a retransmission method including the steps of:

determining, by means of the terminal device, a unit of transmission time to be used in the first transmission of the data to be transmitted;

determining by the terminal device, based on the determined transmission time unit and the Q parameter, a hybrid automatic retransmission request HARQ process used to transmit data to be transmitted, where Q is an integer greater than or equal to 1; and

when the retransmission of the data to be transmitted does not stop before the first specific transmission time unit after the determined transmission time unit, the terminal apparatus performs, starting from the determined transmission unit, one transmission of the data to be transmitted in each transmission time unit using the HARQ process until the last transmission of the data to be transmitted will not be performed in the first specific transmission time unit, where the period in which the specific transmission time unit appears in the time domain resource is Q transmission time units.

[0011] According to a second aspect, the present application further provides a terminal device including:

a processing unit, configured to determine a unit of transmission time used in the first transmission of data to be transmitted;

a HARQ process determining unit, configured to determine, based on the determined transmission time unit and the Q parameter, a hybrid automatic retransmission request HARQ process used to transmit data to be transmitted, where Q is an integer greater than or equal to 1; and

a transmission unit configured: when the retransmission of the data to be transmitted does not stop until the first specific transmission time unit after the determined transmission time unit, the terminal device, starting from the determined transmission unit, performs one transmission of the data to be transmitted in each transmission time unit using the process HARQ until the last transmission of the data to be transmitted is performed in the first specific transmission time unit, where the period in which the specific transmission time unit appears in the time domain resource is Q transmission time units.

[0012] According to a third aspect, the present application provides a retransmission method including the steps of:

determining by the terminal device a non-grant transmission time unit used in the first transmission of data to be transmitted, where the non-grant transmission time unit is a transmission time unit in which the non-grant resource is configured for the terminal device;

determining, by the terminal device, based on the determined unit of non-grant transmission time and the Q parameter, the HARQ process used to transmit the data to be transmitted, where the value of Q is an integer greater than or equal to 1; and

when the retransmission of the data to be transmitted does not stop before the first specific non-grant transmission time unit after the specified non-grant transmission time unit, the terminal device performs, by the terminal device, starting from the specific non-grant transmission time unit, using the HARQ process, one transmission of the data to be transmitted, on the resource configured for the terminal device, in each ungranted transmission time unit, until the last transmission of the data to be transmitted is performed in the first specific ungranted transmission time unit, where the specific ungranted transmission time unit is a specific transmission time unit without permission periodically appearing in units of time of transmission without permission, and the period of a specific unit of time of transmission without permission is equal to Q.

[0013] According to a fourth aspect, the present application further provides a terminal device, the terminal device including:

a processing unit configured to determine a non-grant transmission time unit used in the first transmission of data to be transmitted, where the non-grant transmission time unit is a transmission time unit in which the non-grant resource is configured for the terminal device;

a HARQ process determination unit, configured to determine, based on the determined unit of non-grant transmission time, and the Q parameter of the HARQ process used to transmit data to be transmitted, where the value of Q is an integer greater than or equal to 1; and

a transmission unit configured: when the retransmission of the data to be transmitted does not stop before the first specific non-grant transmission time unit after the specified non-grant transmission time unit, to perform, starting from the specific non-grant transmission time unit, using the HARQ process, one transmission to be data transmission, on the non-grant transmission time unit configured for the terminal device in each non-grant transmission time unit, until the last transmission of the data to be transmitted in the first specific non-grant transmission time unit is performed, where the specific non-grant transmission time unit is a specific non-grant time unit occurring periodically in non-grant time units, and the period of the specific non-grant time unit is Q.

[0014] According to a fifth aspect, the present application further provides a retransmission method, wherein the method includes:

determined based on the unit index of transmission time without resolution n_t+k-1, in which the uplink data sent by the terminal device is detected, or the sequence number of the transmission time unit without permissions n_t+k-1 and a Q parameter corresponding to the terminal device, a HARQ process number used by the terminal device to send uplink data, where the non-grant transmission time unit is specifically the transmission time unit in which the non-grant resource is configured for the terminal device;

decoding the detected uplink data;

in case of incorrect decoding, it is determined by the network device whether the non-grant transmission time unit n _t+k-1 is a specific non-grant transmission time unit; and

if the non-granted transmission time unit n _t+k-1 is a specific non-granted transmission time unit, then one of the following types of processing is performed by the network device:

processing (1): sending a feedback message to the terminal device, where the feedback message carries an indication indicating a wrong reception;

processing (2): sending uplink grant information for scheduling by the terminal device of retransmission of uplink data; and

processing (3): discarding the data without permission sent by the terminal device and clearing the data in the buffer corresponding to the determined HARQ process number.

[0015] According to an implementation of the fifth aspect, the retransmission method further includes:

if the non-grant transmission time unit n _t+k-1 is not a specific non-grant transmission time unit, then the uplink data is again received by the network device in the next non-grant transmission time unit of the terminal apparatus.

[0016] According to another implementation of the fifth aspect, the retransmission method further includes:

in case of correct decoding, a feedback message containing an indication indicating correct reception is sent by the network device to the terminal device.

[0017] According to a sixth aspect, the present application further provides a network device, the network device including:

a HARQ process determination unit configured to determine, based on the index, a unit of transmission time without permission n_t+k-1, in which the uplink data sent by the terminal device is detected, or the sequence number of the transmission time unit without permission n_t+k-1 and a Q parameter corresponding to the terminal device, a HARQ process number used by the terminal device to send uplink data, where the non-grant transmission time unit is specifically the transmission time unit in which the non-grant resource is configured for the terminal device;

a decoding unit 16, configured to decode the detected uplink data;

a judging unit, configured to: when the uplink data cannot be decoded, determining whether the non-grant transmission time unit n _t+k-1 is a specific non-grant transmission time unit; and

a send unit configured to: when uplink data cannot be decoded, and a non-grant transmission time unit n_t+k-1 is by a specific unit of ungranted transmission time, sending to the terminal device a feedback message carrying an indication indicating correct reception or uplink grant information.

[0018] According to an implementation of the sixth aspect, the network device further includes:

a receiving unit configured: when uplink data cannot be decoded, and a unit of transmission time without permissions n_t+k-1is a specific unit of transmission time without permission, continuing to receive uplink data in the next unit of transmission time without permission of the terminal device.

[0019] According to another implementation of the sixth aspect, the sender is further configured to: after the uplink data is correct, send to the terminal device a feedback message containing an indication indicating correct reception.

[0020] According to a seventh aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores an instruction, and when the instruction is executed on the computer, the methods according to the above aspects are executed by the computer.

[0021] According to an eighth aspect, the present application provides a computer program product including an instruction, and when the computer program product is run on the computer, the computer executes the methods in accordance with the above aspects.

[0022] According to a ninth aspect, the present application provides a retransmission method, including the steps of:

determining by the terminal device, based on the parameter Q, the non-granted transmission time unit used in the first transmission of the data to be transmitted, where Q is the period of the non-granted transmission time unit, in non-granted transmission time units that can be used in the first transmission in retransmissions, and the value of Q is greater than or equal to 1;

determining, by the terminal device, based on the determined unit of ungranted transmission time and parameter Q, a hybrid automatic retransmission request HARQ process used to transmit data to be transmitted; and

performing, by the terminal apparatus, a first transmission of data to be transmitted using the determined HARQ process in the determined transmission time unit without permission.

[0023] In the first implementation of the ninth aspect, the step of determining, by the terminal apparatus, based on the Q parameter, the unit of non-permission transmission time used in the first transmission of the data to be transmitted includes the step of:

determining, by the terminal device, based on the parameter Q and the period P of the non-grant resource time domain, a unit of non-grant transmission time to be used in the first transmission of the data to be transmitted.

[0024] In the second implementation of the ninth aspect, in accordance with the method according to the first implementation of the ninth aspect, the step of determining, by the terminal device based on the parameter Q and the non-grant resource time domain period P, the non-grant transmission time unit that can be used in the first transmission data to be transmitted specifically includes the step of:

when the transmission time unit index satisfies the following seventh relation expression, the transmission time unit is an ungranted transmission time unit that can be used in the first transmission of the data to be transmitted, where

the seventh relation expression has the form (T_index - T_Index_Start) mod (P * Q) == T_offset_value, where T_index is the index of the transmission time unit, T_Index_Start is the index of the first ungranted transmission time unit, P is the period of the ungranted resource time domain, Q is the period non-granted transmission time units, in non-granted transmission time units that can be used in the first transmission in retransmissions, T_offset_value is a preset offset value, and the value of T_offset_value can be specifically one of 0, P, 1*P,… or ( Q-1) *P.

[0025] In the third implementation of the ninth aspect, in accordance with the method according to the first implementation of the ninth aspect, the step of determining, by the terminal device, based on the parameter Q and the period P of the non-grant resource time domain, a unit of non-grant transmission time that can be used in the first transmission of subjects data transfer specifically includes the steps in which:

determining an ungranted transmission time unit based on an ungranted resource time domain period P; and

determining from the determined non-grant transmission resource, based on the parameter Q, a non-grant transmission time unit that can be used in the first transmission in the retransmissions.

[0026] In the fourth implementation of the ninth aspect, in accordance with the method according to the third implementation of the ninth aspect, the step of determining from a certain resource of the non-grant transmission based on the Q parameter of the non-grant transmission time unit that can be used in the first transmission in retransmissions includes stage where:

determine that the non-granted transmission time unit satisfying any of the following relationships is the non-granted transmission time unit that can be used in the first transmission in retransmissions:

eighth relation expression: GF_T_Index mod Q == 0;

ninth relation expression: GF_T_Index mod Q == T_offset_value;

tenth relational expression: (T_Index/P) mod Q == 0;

eleventh relational expression: ((T_Index- T_Index_Start) / P) mod Q == 0;

twelfth relation expression: (T_Index/P) mod Q == T_offset_value; and

thirteenth relation expression: ((T_Index - T_Index_Start) / P) mod Q == T_offset_value, where

GF_T_Index - the sequence number of the non-grant transmission time unit, T_Index - the index of the non-grant transmission time unit, T_offset_value - the offset value, T_Index_Start - the index of the first non-grant transmission time unit, P - the non-grant resource time domain period, P is an integer greater than or equal to 1, and Q is the non-grant time unit period, in non-grant time units, that can be used in the first transmission in retransmissions.

[0027] In the fifth implementation of the ninth aspect, in accordance with the method according to any of the ninth aspect and implementations of the ninth aspect, the step of determining by the terminal device, based on a certain unit of transmission time without permission and the Q parameter of the HARQ process, of the hybrid automatic retransmission request used for transmission data to be transferred includes the step where:

determining a HARQ process number based on a sequence number of a certain ungranted transmission time unit, a Q parameter, and a maximum number of HARQ processes supported by the terminal device's ungranted resource.

[0028] In the sixth implementation of the ninth aspect, in accordance with the method according to the fifth embodiment of the ninth aspect, the step of determining the number of the HARQ process based on the sequence number of a certain unit of ungranted transmission time, the Q parameter, and the maximum number of HARQ processes supported by the resource without permission of the terminal device, includes in the stage where:

determine the HARQ process number of the HARQ process according to one of the following relationships:

fourteenth relational expression: HARQ_ID=floor (GF_T_Index/Q) mod N_GF; and

fifteenth relational expression: HARQ_ID=floor (GF_T_Index/Q) mod N_GF+H_offset_value, where

floor() denotes rounding down, HARQ_ID is the HARQ process number, GF_T_Index is the sequence number of the ungranted transmission time unit, N_GF is the maximum number of HARQ processes supported by the resource without the terminal device's permission, and H_offset_value is a preset process number offset value.

[0029] In the seventh implementation of the ninth aspect, in accordance with the method according to any one of the ninth aspect, and from the first implementation to the fourth implementation of the ninth aspect, the step of determining, by the terminal apparatus, based on a certain unit of non-grant transmission time and parameter Q, the hybrid automatic HARQ process a retransmission request used to transmit data to be transmitted includes the step of:

determining a HARQ process number based on an index of a certain unit of ungranted transmission time, a Q parameter, and a maximum number of supported HARQ processes.

[0030] In the eighth implementation of the ninth aspect, according to the method according to the seventh implementation of the ninth aspect, the step of determining by the terminal device, based on a certain unit of transmission time without permission and the Q parameter of the HARQ process of the hybrid automatic retransmission request used for transmitting data to be transmitted, includes includes a stage where:

determine the HARQ process number according to one of the following relationships:

16th relation expression: HARQ_ID=floor (T_Index / (P * Q)) mod N_GF; and

seventeenth relational expression: HARQ_ID=floor (T_Index / (P * Q)) mod N_GF+H_offset_value, where

floor() denotes rounding down, HARQ_ID is the HARQ process number, T_Index is the ungranted transmission time unit index, N_GF is the maximum number of HARQ processes supported by the resource without terminal device permission, H_offset_value is the preset process number offset value , P is the time domain period of the resource without permission, and P is an integer greater than or equal to 1.

[0031] In the ninth implementation of the ninth aspect, the method according to any of the ninth aspect and the implementations of the ninth aspect further includes:

based on a sequence number or an index of a non-granted transmission time unit in which each transmission in retransmissions is performed, a reservation version of the data to be transmitted in each transmission, or an MCS used in each transmission is determined.

[0032] In the tenth implementation of the ninth aspect, the method according to any of the ninth aspect and the implementations of the ninth aspect further includes:

before determining, based on the parameter Q, the non-grant transmission time unit used in the first transmission of the data to be transmitted, the parameter Q and the non-grant resource time domain period P are received by the terminal device.

[0033] According to a tenth aspect, the present application further provides a terminal device including:

a processing unit configured to determine, based on the parameter Q, the non-granted transmission time unit used in the first transmission of the data to be transmitted, where Q is the period of the non-granted transmission time unit, in non-granted transmission time units that can be used in the first transmission in repeated transmissions, and the value of Q is greater than or equal to 1;

a HARQ process determining unit, configured to determine, based on the determined unit of ungranted transmission time and the Q parameter of the HARQ process, a hybrid automatic retransmission request used to transmit data to be transmitted; and

a transmission unit configured to perform a first transmission of data to be transmitted using the determined HARQ process in a determined unit of transmission time without permission.

[0034] In the first implementation of the tenth aspect, the step of determining, based on the Q parameter, the unit of non-permission transmission time used in the first transmission of the data to be transmitted includes the step of:

determining, based on the parameter Q and the non-grant resource time domain period P, a non-grant transmission time unit used in the first transmission of the data to be transmitted.

[0035] In the second implementation of the tenth aspect, according to the device according to the first implementation of the tenth aspect, the step of determining, based on the parameter Q and the non-grant resource time domain period P, a non-grant transmission time unit that can be used in the first transmission of data to be transmitted , specifically includes the step in which:

when the transmission time unit index satisfies the following seventh relation expression, the transmission time unit is a non-granted transmission time unit that can be used in the first transmission of the data to be transmitted, where

the seventh relation expression is (T_index-T_Index_Start) mod (P * Q) == T_offset_value, where T_index is the index of the transmission time unit, T_Index_Start is the index of the first non-grant transmission time unit, P is the period of the non-grant resource time domain, Q is non-grant transmission time unit period, in non-grant transmission time units that can be used in the first transmission in retransmissions, T_offset_value is a preset offset value, and the value of T_offset_value can be specifically one of 0, P, 1*P, .. ., or (Q-1)*P.

[0036] In the third implementation of the tenth aspect, according to the device according to the first implementation of the tenth aspect, the step of determining, based on the parameter Q and the non-grant resource time domain period P, a non-grant transmission time unit that can be used in the first transmission to be transmitted data, specifically includes the steps in which:

determining an ungranted transmission time unit based on an ungranted resource time domain period P; and

determining, from the determined resource, based on the parameter Q, the non-grant transmission time unit that can be used in the first transmission in retransmissions.

[0037] In the fourth implementation of the tenth aspect, in accordance with the device according to the third implementation of the tenth aspect, the step of determining, from a certain resource of non-grant transmission based on the Q parameter, a time unit of non-grant transmission that can be used in the first transmission in retransmissions includes includes a stage where:

determine that the non-granted transmission time unit satisfying any of the following relationships is the non-granted transmission time unit that can be used in the first transmission in retransmissions:

eighth relation expression: GF_T_Index mod Q == 0;

ninth relation expression: GF_T_Index mod Q == T_offset_value;

tenth relation expression: (T_Index/P) mod Q == 0;

eleventh relational expression: ((T_Index-T_Index_Start)/P) mod Q == 0;

twelfth relation expression: (T_Index/P) mod Q == T_offset_value; and

thirteenth relation expression: ((T_Index-T_Index_Start)/P) mod Q == T_offset_value, where

GF_T_Index is the sequence number of the non-grant transmission time unit, T_Index is the non-grant transmission time unit index, T_offset_value is an offset value, T_Index_Start is the index of the first non-grant transmission time unit, P is the non-grant resource time domain period, P is an integer greater than or equal to 1, and Q is the non-grant time unit period, in non-grant time units, that can be used in the first transmission in retransmissions.

[0038] In the fifth implementation of the tenth aspect, in accordance with the device according to any of the tenth aspect and implementations of the tenth aspect, the step of determining, based on a certain unit of ungranted transmission time and the Q parameter, a hybrid automatic retransmission request HARQ process used to transmit the subject data transfer, includes the stage at which:

determining a HARQ process number based on the sequence number of the determined ungranted transmission time unit, the Q parameter, and the maximum number of HARQ processes supported by the terminal device's ungranted resource.

[0039] In the sixth implementation of the tenth aspect, in accordance with the device according to the fifth implementation of the tenth aspect, the step of determining the number of the HARQ process based on the sequence number of the determined unit of ungranted transmission time, the Q parameter, and the maximum number of HARQ processes supported by the resource without permission of the terminal device, includes a stage where:

determine the HARQ process number of the HARQ process according to one of the following relational expressions:

fourteenth relational expression: HARQ_ID = floor(GF_T_Index/Q) mod N_GF; and

fifteenth relational expression: HARQ_ID = floor(GF_T_Index/Q) mod N_GF+H_offset_value, where

floor() denotes rounding down, HARQ_ID is the HARQ process number, GF_T_Index is the sequence number of the ungranted transmission time unit, N_GF is the maximum number of HARQ processes supported by the resource without terminal device permission, and H_offset_value is a preset process number offset value.

[0040] In the seventh implementation of the tenth aspect, according to the apparatus according to any one of the tenth aspect, and the first to the fourth implementations of the tenth aspect, the step of determining, based on a certain unit of non-grant transmission time and the Q parameter, a hybrid automatic retransmission request HARQ process, used to transmit the data to be transmitted includes the step of:

determining a HARQ process number based on an ungranted transmission time unit index, a Q parameter, and a maximum number of supported HARQ processes.

[0041] In the eighth implementation of the tenth aspect, in accordance with the device according to the seventh implementation of the tenth aspect, the step of determining, based on a certain unit of ungranted transmission time and a Q parameter, a hybrid automatic retransmission request HARQ process used to transmit data to be transmitted, includes includes a stage where:

determine the HARQ process number according to one of the following relationships:

sixteenth relation expression: HARQ_= floor(T_Index/(P*Q)) mod N_GF; and

seventeenth relational expression: HARQ_= floor(T_Index/(P*Q)) mod N_GF+H_offset_value, where

floor() denotes rounding down, HARQ_ID is the HARQ process number, T_Index is the ungranted transmission time unit index, N_GF is the maximum number of HARQ processes supported by the resource without terminal device permission, H_offset_value is the preset process number offset value, P is the period of the resource's time domain without permission, and P is an integer greater than or equal to 1.

[0042] In the ninth implementation of the tenth aspect, in accordance with the device according to any of the tenth aspect and implementations of the tenth aspect, the processing unit is further configured to:

determining, based on the sequence number or index of the unentitled transmission time unit in which each transmission is performed in retransmissions, the version of the reservation that the data to be transmitted will be transmitted in each transmission, or the MCS used in each transmission.

[0043] In the tenth implementation of the tenth aspect, in accordance with the device according to any of the tenth aspect and implementations of the tenth aspect, the transmission unit is further configured to:

obtaining parameter Q and period P of the time domain of the resource without permission.

BRIEF DESCRIPTION OF THE DRAWINGS

[0044] FIG. 1 is a diagram of an existing retransmission technology;

[0045] FIG. 2 is a schematic structural diagram of a communication system according to an embodiment of the present invention;

[0046] FIG. 3 is a flowchart of a retransmission method according to an embodiment of the present invention;

[0047] FIG. 4 is a flowchart of a retransmission method according to an embodiment of the present invention;

[0048] FIG. 5 is a diagram of a retransmission process according to an embodiment of the present invention;

[0049] FIG. 6 is a diagram of a process for determining a HARQ process number according to an embodiment of the present invention;

[0050] FIG. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present invention;

[0051] FIG. 8 is a non-permission resource configuration diagram according to an embodiment of the present invention;

[0052] FIG. 9 is a flowchart of a retransmission method according to an embodiment of the present invention;

[0053] FIG. 10 is a diagram of a retransmission process according to an embodiment of the present invention;

[0054] FIG. 11 is a diagram of a retransmission process according to another embodiment of the present invention;

[0055] FIG. 12 is a schematic block diagram of a terminal device according to an embodiment of the present invention;

[0056] FIG. 13 is a schematic block diagram of a terminal device according to another embodiment of the present invention;

[0057] FIG. 14 is a non-grant resource configuration diagram according to another embodiment of the present invention;

[0058] FIG. 15 is a flowchart of a retransmission method according to an embodiment of the present invention;

[0059] FIG. 16 is a block diagram of a network device according to an embodiment of the present invention;

[0060] FIG. 17 is a block diagram of a network device in accordance with another embodiment of the present invention;

[0061] FIG. 18 is a flowchart of a retransmission method according to another embodiment of the present invention; and

[0062] FIG. 19 is an allocation diagram of non-grant transmission time units according to an embodiment of the present invention.

Description of Embodiments

[0063] The following will clearly describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, embodiments of the present invention. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without creative effort should fall within the protection scope of the present invention.

[0064] It should be understood that in a modern cellular communication system, for example, in a communication system such as the Global System for Mobile Communication (Global System for Mobile Communication, abbreviated "GSM"), wideband code division multiple access (Wideband Code Division Multiple Access, abbreviated "WCDMA") or Long Term Evolution (Long Term Evolution, abbreviated "LTE"), voice and data communications are mainly supported. A typical base station usually supports a limited number of connections, and this is easy to implement.

[0065] FIG. 2 is a diagram of a communication network to which an embodiment of the present invention is applied. As shown in FIG. 2, communication network 100 includes a network device 102 and terminal devices (referred to as UEs in the figure) 104, 106, 108, 110, 112, and 114. The network device connects to the terminal devices wirelessly, by wire, or in another manner. It should be understood that in FIG. 2, that the communication network 100 includes one network device is simply used as an example for description, but this embodiment of the present invention is not limited thereto. For example, the communication network may alternatively include more network devices. Likewise, the network may alternatively include more terminal devices, and the network device may further include another device.

[0066] The communication network in this embodiment of the present invention may be a public land mobile network (Public Land Mobile Network, abbreviated "PLMN"), a device-device network (Device to Device, abbreviated "D2D"), a network M2M or other network. Fig. 1 is just a simplified diagram of the example. The communication network may further include another network device that is not shown in FIG. one.

[0067] The terminal device in this embodiment of the present invention is a device having a wireless sending and receiving function, and may be on the ground and be an indoor device, an outdoor device, a handheld device, a wearable device, or a vehicle-mounted device, the device may be located on water (for example, on a ship) or may be in the air (for example, in an airplane, balloon or satellite). The terminal device can be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless sending and receiving function, a virtual reality terminal device (Virtual Reality, VR), an augmented reality terminal device (Augmented Reality, AR), a wireless terminal device in industrial control, self-driving wireless terminal device, telemedicine wireless terminal device (remote medical), smart grid wireless terminal device, transport security wireless terminal device (transportation safety), smart city wireless terminal device, smart home wireless terminal device, or the like. This embodiment of the present application does not impose any restrictions on the application scenario. A terminal device may sometimes also be referred to as user equipment (user equipment (UE), access terminal device, UE, UE, mobile station, mobile console, remote station, remote terminal device, mobile device, UE terminal device, terminal device, device wireless communication, UE agent, UE device, and the like. The access terminal device may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone for short, a Wireless Local Loop (WLL for short), a Personal Digital Assistant (Personal Digital Assistant, for short). "PDA"), a portable device having a wireless communication function, a computing device, another processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network, a terminal device in a future advanced PLMN network, or the like. similar.

[0068] The network device in this embodiment of the present invention may be a device capable of communicating with a terminal device. The network device may be a Base Transceiver Station (BTS for short) in a Global System for Mobile Communication (GSM for short) or a Code Division Multiple Access (CDMA) system for short. ”), may be a NodeB (NodeB, abbreviated as “NB”) in a Wideband Code Division Multiple Access (WCDMA) system, may be an advanced NodeB (Evolutional Node B, abbreviated as “eNB” or “ eNodeB") in a Long Term Evolution (LTE for short) system, or can be radio controlled in a Cloud Radio Access Network (CRAN) scenario. Alternatively, the network device may be a relay station, an access point, a vehicle-mounted device, a wearable device, a network device in a future 5G network, a network device in a future advanced PLMN, or the like.

[0069] In the present application, grant-free transmission is specific to uplink data transmission and may be represented as "grant-free transmission" in English. Permissionless transmission may be a transmission mode in which a terminal device may transmit uplink data without dynamic scheduling and/or specific permission from a network device. When transmitting without permission, when the terminal device needs to transmit uplink data every time, the terminal device does not need to send a scheduling request to the base station, and it does not need to receive scheduling information in response to a scheduling request from the base station, it can directly send data uplink using a predetermined transmission resource or a transmission resource previously allocated by the network device. The network device detects on a predetermined or pre-allocated transmission resource the uplink data sent by the terminal device. The detection may be blind detection, may be detection based on a particular control field in the uplink data, or may be detection performed in another manner.

[0070] The scheduling information may be an uplink grant that is sent by the network device to the terminal device after receiving an uplink scheduling request sent by the terminal device. The uplink grant indicates a transmission resource that is allocated to the terminal device and that is used for uplink transmission.

[0071] The transmission resource may be a physical resource used to transmit uplink data. A physical resource is a time-frequency resource limited to one or more units of transmission time in the time domain or a bandwidth of a certain size in the frequency domain. The transmission time unit may be the minimum unit of time for a single transmission, and may be a slot, a mini-slot, a sub-frame, a transmission time interval (TTI), or N symbols (for example, , N OFDM symbols). The TTI size may be 1 ms, or may be another preset or predetermined value. The bandwidth size may be represented by inheriting the bandwidth representation method in an existing communication system (e.g., an LTE communication system), for example, may be represented by the number of subcarriers, may be represented by the number of Resource Blocks (RB), or may be represented by the number of subbands .

[0072] The transmission resource may further include, but is not limited to, a combination of one or more of the following resources:

- a spatial domain resource such as a transmitting antenna or beam;

- a code domain resource such as a Sparse Code Multiple Access (SCMA for short) codebook, a Low Density Signature (LDS) for short, or a CDMA code; and

- an uplink pilot resource, in which the uplink pilot resource includes a reference signal sequence, such as a demodulation reference signal (DMRS) sequence, a Preamble sequence, or a Sounding RS sequence .

[0073] In the present application, a transmission resource used for non-grant transmission is also referred to as a non-grant resource.

[0074] In the non-granted transmission, the time at which the terminal device starts to perform the first transmission in retransmissions is not fixed and unpredictable, and the network device also cannot predict the time at which the terminal device also starts to perform retransmission. Therefore, when the network device receives data sent by the terminal device through retransmission, there is a relatively high probability that the first transmission in the retransmissions cannot be detected or determined, and therefore the HARQ process used by the terminal device to perform the retransmission does not can be defined.

[0075] In order to increase the likelihood that the network device will successfully determine the HARQ process used by the terminal device to perform retransmissions, some technologies may be implemented to assist the network device in detecting and determining the first transmission. For example, the DMRS (such as a DMRS sequence or DMRS resource) used by the terminal device in the first transmission in retransmissions is different from the DMRS used in a transmission other than the first transmission in retransmissions. Thus, if the network device detects the DMRS used in the first transmission, the network device can determine that the current transmission is the first transmission in the retransmissions. However, in the real case, due to many reasons such as relatively poor channel conditions, the network device is likely to be unable to detect the data transmission being performed by the terminal device, and furthermore, be unable to determine whether the terminal device is performing the first transmission in retransmissions. . Therefore, even if assistive technology is introduced, there is a relatively high probability that the network device cannot determine the HARQ process used by the terminal device to perform retransmissions.

[0076] In view of the above technical disadvantage, embodiments of the present invention provide a retransmission method and a terminal device to increase the success rate of a network device in determining the HARQ process used in retransmissions.

[0077] An embodiment of the present application provides a retransmission method. As shown in FIG. 3, the method is applied to a terminal device and may include the following steps.

[0078] Step S301: The transmission time unit used in the first transmission of the data to be transmitted is determined.

[0079] Step S302: Based on the determined transmission time unit and the Q parameter, the HARQ process used to transmit the data to be transmitted, where the Q value is an integer greater than or equal to 1, is determined.

[0080] In an embodiment, the Q parameter may be indicated by the network device and reported to the terminal device. The network device may indicate different values for the Q parameters of different terminal devices, may indicate the same value for the Q parameters of different terminal devices, or may indicate multiple values of the Q parameter for one terminal device. When the unlicensed resource preconfigured by the network device for the terminal device includes a plurality of frequency resources, the network device may configure a Q parameter for each of the plurality of frequency resources, or may configure the same Q parameter for the plurality of frequency resources. The network device may add the Q parameter configured by the network device for the terminal device to the signaling sent by the network device to the terminal device. The signaling may be higher layer signaling (eg, medium access control (MAC) signaling or radio resource control (RRC) signaling) or may be physical layer signaling (eg, downlink control information ( downlink control information, DCI)). In an embodiment, the signaling carrying the Q parameter may further carry information indicative of the permissionless resource configured for the terminal device. If the network device configures the Q parameter for each frequency resource in the resource without the permission of the terminal device, the network device may add the Q parameter corresponding to the frequency resource to the signaling. In this embodiment of the present invention, one frequency resource may be one RB, a plurality of adjacent RBs that are linked together, a single carrier, or a plurality of adjacent carriers that are linked together.

[0081] In an embodiment, the value of the Q parameter is specified in a standard, eg, specified in a standard followed by both the terminal device and the network device.

[0082] In an embodiment, the value of parameter Q is less than the maximum number K of retransmissions. In retransmission technology, data is transmitted a maximum of K times. In particular, if no retransmission from the first transmission to the Kth transmission does not stop, then the data is continuously sent for K times, and the retransmission procedure ends after how the K-th gear is done. The maximum numbers K of retransmissions that are supported by different terminal devices may be the same or different, and even the maximum numbers K of retransmissions that are supported by one terminal device in different time periods may be the same or different. The maximum number K of retransmissions supported by the terminal device may be predetermined (eg, specified in the standard) or may be specified by the network device and signaled to the terminal device using signaling. When the maximum number K of retransmissions supported by the terminal device is specified by the network device, the network device may add the maximum number K of retransmissions supported by the terminal device and the Q parameter to the same signaling part to send to the terminal device, or may add the maximum number K retransmissions to another part of the signaling to be sent to the terminal device.

[0083] In an embodiment, parameter Q specifically represents the maximum number K of retransmissions supported by the terminal device.

[0084] In an embodiment, step S302 may specifically include: determining a HARQ process number based on an index of the determined transmission time unit, a parameter Q, and a maximum number N of supported HARQ processes. In a particular implementation, the HARQ process number may be determined according to formula (1) or formula (2).

[0085] Formula (1) is:

HARQ_ID = floor(T_Index/Q) mod N; and

formula (2) has the form:

HARQ_ID = floor(T_Index/Q) mod N+H_offset_value, where

floor() denotes rounding down, HARQ_ID is the HARQ process number, T_Index is the transfer time unit index, N is the maximum number of HARQ processes supported, and H_offset_value is a preset process number offset value.

[0086] When the resource without permission configured by the network device for the terminal device includes a plurality of frequency resources, and the Q parameter is specified for each frequency resource, the HARQ process number corresponding to each frequency resource in the transmission time unit T_Index is calculated using the formula (1 ) or (2) based on the Q parameter corresponding to each frequency resource. When the HARQ process number corresponding to each frequency resource is calculated using formula (2), different frequency resources may correspond to different preset process number offset values H_offset_value. In this embodiment of the present invention, H_offset_value may be pre-set (eg, specified in a standard) or may be specified by a network device and notified to the terminal device using signaling. When the network device specifies the H_offset_value, the network device may add the H_offset_value and the Q parameter to the same part of the signaling to send to the terminal device, or may add the H_offset_value to another part of the signaling to send to the terminal device.

[0087] Step S303: When the retransmission of the data to be transmitted does not stop before the first specific transmission time unit after the determined transmission time unit, the terminal apparatus performs, starting from the determined transmission unit, one transmission of the data to be transmitted in each transmission time unit using the HARQ process until the last transmission of the data packet is made in the first specific transmission time unit, where the period in which the specific transmission time unit appears in the time domain resource is Q transmission time units.

[0088] In this embodiment of the present invention, the specific transmission time unit is the transmission time unit in which the retransmission procedure is forcibly terminated. When any of the retransmissions are to be performed in a specific transmission time unit, the retransmission procedure is terminated. In particular, even if one transfer made in a certain unit of transfer time is not the Kth transfer in retransmissions, all transmissions in retransmissions that are not performed are no longer performed after a particular transmission unit.

[0089] In this embodiment of the present invention, a specific transmission time unit periodically appears in a time domain resource in a communication system, and the period of the specific transmission time unit is Q transmission time units. The Q parameter can also be understood as the period in which a particular unit of transmission time appears in the time domain resource.

[0090] In this embodiment of the present invention, retransmissions may be terminated beforehand due to one of the following termination conditions: termination condition A: the terminal device receives an ACK returned by the network device for data to be transmitted sent by the terminal device, and termination condition B: the terminal device, after performing a specific transmission (not the last transmission) in the retransmissions, receives an uplink grant sent by the network device for the data to be sent by the terminal device.

[0091] In the case of terminating condition A, the terminal device terminates the transmission in retransmissions that is not being performed and clears the buffer corresponding to the HARQ process used in the retransmission.

[0092] In the case of termination condition B, the terminal apparatus terminates transmission in retransmissions that is not performed and retransmits data to be sent on the transmission resource indicated by the grant. Of course, in the case of another condition for terminating retransmissions, the retransmission process of the data to be transmitted is also terminated.

[0093] In step S303, the terminal apparatus determines whether the current transmission time unit is a specific transmission time unit, and if so, terminates the procedure for retransmitting the data to be transmitted after performing one transmission of the data to be transmitted in the current transmission time unit, or if is not, then performs one transmission of the data to be transmitted in the next transmission time unit of the current transmission time unit.

[0094] That the terminal device determines whether the current transmission time unit is a specific transmission time unit specifically includes the following:

when the value obtained by performing a division operation with a remainder by Q on the index of the current transmission time unit is 0 or a preset time offset value, the current transmission time unit is a specific transmission time unit. The predetermined time offset value may be predetermined (eg, specified in a standard) or may be set by a network device and signaled to the terminal device using signaling. When the network device sets the preset time offset value, the network device may add the preset time offset value and the Q parameter to the same signaling part to send to the terminal device, or may add the preset time offset value to another signaling part for sent to the terminal device.

[0095] In retransmissions, one reservation version of the data to be transmitted may be transmitted each time, and the reservation versions in different transmissions may be the same or different.

[0096] In an embodiment, the reservation version is associated with a unit of transmission time. Specifically, in a transmission time unit, the terminal apparatus may only send a reservation version associated with a transmission time unit and may not send another version. In this embodiment, the method shown in FIG. 3 may further include: determining a reservation version of data to be transmitted in each transmission, based on a transmission time unit index in which each transmission in retransmissions is performed. Since the reservation version is related to the transmission time unit, the network device can accurately know the reservation version information of the received data based only on the transmission time unit in which the data is received. The relationship between the reservation version and the transmission time unit may be predetermined (eg, specified in the standard) or may be set by the network device and signaled to the terminal device using signaling. The network device may add a relation between a reservation version and a transmission time unit and a Q parameter to the same signaling part to send to a terminal device, or may add a relation between a reservation version and a transmission time unit to another signaling part to send to a terminal device.

[0097] In retransmissions, the Modulation and Coding Scheme (MCS) used in different transmissions may be the same or different.

[0098] In an embodiment, the MCS is associated with a unit of transmission time. In particular, when sending data in a transmission time unit, the terminal device may only use the MCS associated with the transmission time unit and may not use a different MCS. In this embodiment, the method shown in FIG. 3 may further include determining, based on the transmission time unit index in which each transmission in retransmissions is performed, the MCS to be used in each transmission. Since the MCS is related to the transmission time unit, the network device can accurately know, based only on the transmission time unit in which data is received, the MCS corresponding to the received data. The relationship relationship between the MCS and the transmission time unit may be predetermined (eg, specified in the standard), or may be specified by the network device and signaled to the terminal device using signaling. The network device may add a relation between a reservation version and a transmission time unit and a Q parameter to the same signaling part to send to a terminal device, or may add a relation between a reservation version and a transmission time unit to another signaling part to send to a terminal device.

[0099] In an embodiment, if step S301 includes a step in which: if the first transmission time unit that can be used in the first transmission of data to be transmitted is a specific transmission time unit, then the terminal device may use the first transmission time unit after the specific transmission time unit as the transmission time unit used in the first transmission of the data to be transmitted.

[0100] In this embodiment of the present invention, from the unit of time in which the first transmission is performed to the first specific unit of transmission time, the terminal apparatus performs retransmissions using the same HARQ process and performs the last transmission of data to be transmitted in the first specific unit transmission time. Provided that the network device detects any one of the retransmissions, the network device can determine, based on the transmission time unit in which the transmission is detected, the location, namely the first specific transmission time unit in which the last transmission in the retransmissions is performed, and determine, based on the first specific transmission time unit, the HARQ process number used to perform the retransmissions. In the method provided in this embodiment of the present invention, the network device determines the HARQ process number used in retransmissions regardless of whether the first transmission is detected and determined. Therefore, there is a very high success rate for the network device to determine the HARQ process number used in retransmissions.

[0101] FIG. 4 shows another retransmission method according to an embodiment of the present invention. The method is further described using an example in which the transmission time unit is specifically a slot, and the method includes the following steps:

[0102] Step S401: The terminal apparatus performs the first transmission in retransmissions of data to be transmitted on the resource without permission in slot n (n > 0), sets k=1, and executes step S402.

[0103] Step S402: The terminal device determines whether slot n+k-1 is a specific slot, and if so, performs step S404, otherwise, performs step S403.

[0104] Step S403: The terminal device performs (k+1)-th transmission in retransmissions of data to be transmitted in slot n+k, sets k=k+1, and executes step S402.

[0105] Step S404: End the retransmission procedure. Specifically, the terminal apparatus performs k transmissions of data to be transmitted only in slots n to n+k-1, and does not perform retransmissions of data to be transmitted in slot n+k and the following slots; and the stages end.

[0106] In this embodiment, a specific slot is a specific example of a specific unit of transmission time in the embodiment of FIG. 3 and the period in which a particular slot appears is Q slots. To determine the value of Q, refer to the associated description in the embodiment shown in FIG. 3.

[0107] In step S402, the terminal device may determine, using the following method, whether slot n+k-1 is a specific slot.

[0108] The slot index n+k-1 is assumed to be index=n+k-1. If index=n+k-1 satisfies the following formula (3) or formula (4), then the terminal device may consider that slot n+k-1 is a specific slot, and after performing one transmission of data to be transmitted in the slot, terminate the procedure retransmission. Otherwise, the terminal device determines that slot n+k-1 is not a particular slot.

[0109] Formula (3) is Index mod Q == 0; and

formula (4) is Index mod Q == T_offset_value, where

T_offset_value is the preset time offset value referred to in the embodiment of FIG. 3, T_offset_value is an integer greater than 0 and less than Q, and T_offset_value may be preset (eg, specified in a standard) or may be specified by the network device and signaled to the terminal device using signaling.

[0110] FIG. 5 shows a specific example of the method shown in FIG. 4. In this example, Q=6, and the maximum number K of retransmissions supported by the terminal device is also 6. Data packet 1 retransmissions are used as an example. The terminal device starts the first transmission at retransmission in slot n, and upon determining that slot n+3 is a specific slot, the terminal device completes the retransmission procedure after performing one transmission of data packet 1 in slot n+3. In particular, the terminal device no longer performs the remaining two transmissions in the retransmissions in slots n+4 and n+5.

[0111] In step S401 and step S403, when the terminal apparatus performs one transmission in retransmissions of data to be transmitted, the following steps are included:

The terminal device determines based on formula (1) or formula (2) in the above embodiment, the HARQ process ID of the HARQ process used in the current transmission; and

sends data to be sent to the network device using a process corresponding to the HARQ process ID.

[0112] FIG. 6 shows an example of determining, using formula (1) or formula (2), the HARQ process number used in each slot. In this example, Q=6, and the maximum number K of retransmissions supported by the terminal device is also 6. As can be seen from FIG. 6 that the terminal device performs the first four transmissions in data burst 1 retransmissions using HARQ process 0 and performs the first five transmissions in data burst 2 retransmissions using HARQ process 1.

[0113] Upon detecting a specific transmission in the retransmissions of a specific data packet of the terminal device in slot n+k, the network device also calculates, according to formula (1) or (2), the HARQ process number used to send the data packet in slot n+k.

[0114] In another embodiment, the terminal device does not need to calculate the HARQ process number in each transmission, but only needs to calculate the HARQ process number in the first transmission, and it performs one transmission of the data to be transmitted using the process corresponding to the HARQ process number in each subsequent slot. to the first specific slot after the first transmission.

[0115] An embodiment of the present invention further provides a terminal apparatus capable of performing the transmission method provided in the previous embodiments. As shown in FIG. 7, the device includes:

a processing unit 701, configured to determine a unit of transmission time used in the first transmission of data to be transmitted;

a HARQ process determination unit 702, configured to determine, based on the determined transmission time unit and the Q parameter, a hybrid automatic retransmission HARQ process used to transmit data to be transmitted, where Q is an integer greater than or equal to 1; and

a transmission unit 703, configured: when the retransmission of the data to be transmitted does not stop until the first specific transmission time unit after the determined transmission time unit, to perform, starting from the determined transmission unit, one transmission of the data to be transmitted in each transmission time unit using the HARQ process until the last transmission of the data to be transmitted is performed in the first specific transmission time unit, where the period in which the specific transmission time unit appears in the time domain resource is Q transmission time units.

[0116] For the specific implementation of each block in the terminal device, see the corresponding description in the embodiments shown in FIG. 3 and FIG. 4. Details are not described here again.

[0117] In an embodiment, the unentitled resources configured by the network device for the terminal device may be discrete or inconsistent in time. For example, as shown in FIG. 8, the network device configures resources without permission for the terminal device in units of transmission time n_t,n_t+1,n_t+2,n_t+3,n_t+4 and n_t+5 and does not configure resources without permission in each of the unit of transmission time between n_t and n_t+1, units of transmission time between n_t+1 and n_t+2, units of transmission time between n_t+2 and n_t+3, units of transmission time between n_t+3 and n_t+4 and units of transmission time between n_t+4 and n_t+5. In this application, the unit of transmission time, in which resource without permission configured for the terminal device is called the unit of transmission time without permission. For example, units of transmission time n_t,n_t+1,n_t+2,n_t+3,n_t+4 and n_t+5shown in FIG. 8 are referred to as ungranted transmission time units. In FIG. eight number in shaded field_,e.g. "t", represents is the sequence number of the non-permission time unit and is the ranking of the non-permission time unit in all non-permission time units corresponding to the terminal device. For example, the unit of transmission time n_t represents the tth transmission time unit in which the unentitled resource related to the terminal device is configured, and the transmission time unit n_t+1is the (t+1)th transmission time unit in which the non-grant resource is configured and which is the terminal device. The number under each frame in Fig. 8, for example, "n_t, is the index of the unit of transmission time, and the index reflects the ranking of the unit of time transmissions in all units of time transmission in the communication system. For a method for determining a transmission time unit index, refer to a method for determining a frame number and a subframe number in an existing communication system such as an LTE system. Details are not described here again. For the non-grant transmission time unit sequence number, the terminal device may determine the non-grant transmission time unit sequence number according to the non-grant resource configuration rule (e.g., non-grant resource time domain period) that is sent by the network device, or may determine the non-grant transmission time unit sequence number by maintaining a counter of the unit of transmission time without permission. In an embodiment, a network device may configure multiple resource sets without permission for the terminal device. As shown in FIG. 14, the network device configures two sets of unentitled resources GFRC1 and GFRC2 for the terminal device. The time domain periods of the first GFRC1 non-grant resource set and the second GFRC2 non-grant resource set are the same, and their time domain periods are all 5 (more specifically, the non-grant resource is configured every five transmission time units). However, the initial locations in the time domain of the first non-GFRC1 resource set and the second non-GFRC2 resource set are different. When a network device configures a plurality of non-grant transmission resource sets for a terminal device, the terminal device may maintain a counter of non-grant transmission time units for each non-grant resource set.

[0118] For the case where ungranted resources are inconsistent in time, an embodiment of the present invention provides a retransmission method. As shown in FIG. 9, in the method, each transmission in retransmissions is performed in a unit of transmission time without grant. The method includes the following steps.

[0119] Step S901: The non-grant transmission time unit used in the first transmission of the data to be transmitted is determined, where the non-grant transmission time unit is the transmission time unit in which the non-grant resource is configured for the terminal device.

[0120] Step S902: Based on the determined non-grant transmission time unit and the Q parameter, the HARQ process used to transmit the data to be transmitted, where the Q value is an integer greater than or equal to 1, is determined.

[0121] In an embodiment, step S902 may specifically include: determining a HARQ process number based on a sequence number (e.g., "t+1" in FIG. 8) of a certain non-grant transmission time unit, a Q parameter, and a maximum the number of HARQ processes supported by the resource without the permission of the terminal device. In a particular implementation, the HARQ process number may be determined according to formula (5) or formula (6).

[0122] Formula (5) is:

HARQ_ID = floor(GF_T_Index/Q) mod N_GF; and

formula (6) has the form:

HARQ_ID = floor(GF_T_Index/Q) mod N_GF+H_offset_value where

floor() denotes rounding down, HARQ_ID is the HARQ process number, GF_T_Index is the ordinal number of the ungranted transmission time unit, N_GF is the maximum number of HARQ processes supported by the resource without terminal device permission, and H_offset_value is a preset process number offset value.

[0123] In another embodiment, step S902 may specifically include: determining a HARQ process number based on index (for example, "n_t+1» in Fig. 8) a specific unit of unentitled transmission time, the Q parameter, and the maximum number of supported HARQ processes. In a particular implementation, the HARQ process number may be determined according to formula (7) or formula (8).

[0124] Formula (7) is:

HARQ_ID = floor(T_Index/(P * Q)) mod N_GF; and

formula (8) has the form:

HARQ_ID = floor(T_Index/(P*Q)) mod N_GF+H_offset_value where

floor() denotes rounding down, HARQ_ID is the HARQ process number, T_Index is the ungranted transmission time unit index, N_GF is the maximum number of HARQ processes supported by the resource without terminal device permission, H_offset_value is the preset process number offset value , P is the time domain period of the resource without permission, and P is an integer greater than or equal to 1.

[0125] In the above embodiment, P, N_GF, and H_offset_value may be predefined (e.g., defined in the standard), may be specified by the network device and notified to the terminal device using signaling, or may be determined by negotiation between the network device and the terminal device. When the network device specifies the H_offset_value, the network device may add P, N_GF, H_offset_value, and the Q parameter to one part of the signaling to send to the terminal device, or may add P, N_GF, and H_offset_value to another part of the signaling to send to the terminal device.

[0126] When the non-grant resource configured by the network device for the terminal device includes a plurality of frequency resources, and the Q parameter is indicated for each frequency resource, the HARQ process number corresponding to each frequency resource in the non-grant transmission time unit, GF_T_Index (or T_index ) is calculated using any of the above formulas (5) - (8) based on the Q parameter corresponding to each frequency resource. When the HARQ process number corresponding to each frequency resource is calculated using formula (6) or (8), different frequency resources may correspond to different preset process number offset values H_offset_value. The H_offset_value corresponding to each frequency resource may be predetermined (eg, specified in a standard), may be specified by the network device and notified to the terminal device using signaling, or may be determined by negotiation between the terminal device and the network device. When the network device sets the H_offset_value, the network device may add the H_offset_value corresponding to each frequency resource and the Q parameter to the same part of the signaling to send to the terminal device, or may add the H_offset_value corresponding to each frequency resource to the other part of the signaling to send to the terminal device. In another embodiment, the network device may indicate a Q parameter for an unlicensed resource including a plurality of frequency resources. When the network device configures a plurality of non-grant resource sets for a terminal device, the network device may further specify a parameter Q, H_offset_value, and N_GF for each non-grant resource set. The terminal device may select one non-grant resource set from a plurality of non-grant resource sets for retransmissions of data to be transmitted, and calculate the HARQ process number corresponding to the non-grant transmission time unit GF_T_Index (or T_index) in the non-grant resource set using any of the above formulas ( 5) - (8) based on the parameter Q, H_offset_value and N_GF corresponding to the set of resources without permission.

[0127] Step S903: When the retransmission of the data to be transmitted does not stop until the first specific non-grant transmission time unit after the determined non-grant transmission time unit, the terminal device performs, starting from the specific non-grant transmission time unit, using the HARQ process, one transmission data to be transmitted on the non-granted transmission time unit configured for the terminal device in each non-granted transmission time unit until the last transmission of the data to be transmitted in the first specific non-granted transmission time unit is performed.

[0128] In step S903, the specific non-grant transmission time unit is specifically non-grant transmission time unit periodically occurring in non-grant transmission time units, and the period of the specific non-grant transmission time unit is Q non-grant transmission time units. Specifically, the specific non-grant transmission time unit is a transmission time unit in which the non-grant resource is configured, and two adjacent specific non-grant transmission time units are separated by (Q-1) non-grant transmission time units. As shown in FIG. 8, it is assumed that Q=5, and the unit of non-grant transmission time n_t (t-th time unit of transmission without permission of the terminal device) is a specific unit of transmission time without permission. In this case, the next specific non-grant transmission time unit is the non-grant transmission time unit n_t+5 (namely (t+5)-th unit of transmission time without permission terminal device), and there are four ungranted time units between the ungranted time unit n_t and unit of transmission time without permission n_t+5.

[0129] In step S903, each transmission of data to be transmitted is performed in the non-grant transmission time unit, and the non-grant resource configured for the terminal device in the non-grant transmission time unit is used. When the plurality of non-grant resources is configured in one unit of non-grant transmission time, the terminal device may select one or more non-grant resources from the plurality of non-grant resources, or even select all of the non-grant resources configured for the terminal device in the unit of transmission time without grant to transmit the subject data transfer.

[0130] In step S903, the terminal apparatus determines whether the current non-grant transmission time unit is the first specific non-grant transmission time unit, and if so, terminates the procedure for retransmitting the data to be transmitted after performing transmission of the data to be transmitted in the current transmission time unit without permission, or, if not, then continues to perform one transmission of the data to be transmitted in the next unit of transmission time without permission.

[0131] A step in which the terminal device determines whether the current non-grant transmission time unit is a first specific non-grant transmission time unit includes a step in which:

perform a modulo Q operation on the sequence number of the current transmission time unit without permission; and

if the value resulting from the modulo Q operation is 0 or a preset time offset value, then the current non-granted transmission time unit is a specific non-granted transmission time unit; or

if the value resulting from the modulo Q operation is neither 0 nor the preset time offset value, then the current non-granted transmission time unit is not a specific non-granted transmission time unit.

[0132] The preset time offset value may be preset (eg, specified in the standard) or may be set by the network device and signaled to the terminal device using signaling. When the network device sets the preset time offset value, the network device may add the preset time offset value and the Q parameter to the same signaling part to send to the terminal device, or may add the preset time offset value to another signaling part for sent to the terminal device.

[0133] In retransmissions, one reservation version of the data to be transmitted may be transmitted each time, and the reservation versions in different transmissions may be the same or different.

[0134] In an embodiment, the reservation version is associated with a non-granted transmission time unit. Specifically, in the non-grant transmission time unit, the terminal apparatus may send only the reservation version associated with the non-grant transmission time unit and may not send the other version. In this embodiment, the method shown in FIG. 9 may further include: determining a reservation version of the data to be transmitted in each transmission based on the non-granted transmission time unit index in which each transmission is performed in retransmissions, or based on the non-grant transmission time unit sequence number, in which each transmission in retransmissions is performed. Since the reservation version is related to the non-granted transmission time unit, the network device can accurately know the reservation version information of the received data based only on the non-granted transmission time unit in which the data is received. The link relationship between the reservation version and the non-granted transmission time unit may be predetermined (eg, specified in the standard), or may be specified by the network device and signaled to the terminal device using signaling. The network device may add a relationship between the reservation version and the non-granted transmission time unit and the Q parameter to the same part of the signaling to send to the terminal device, or may add the relationship between the reservation version and the non-grant transmission time unit to another part of the signaling to send. to the terminal device.

[0135] In an embodiment, a reservation version is associated with each non-granted transmission time unit in a specific non-granted transmission time unit period. From the above embodiment, it can be learned that the specific non-granted transmission time unit period includes Q non-granted transmission time units (including one specific non-granted transmission time unit). For example, as shown in FIG. 8, the period of a specific non-granted transmission time unit includes non-granted transmission time units. permissions n_t+1,n_t+2,n_t+3,n_t+4and n_t+5. When data to be transmitted is transmitted using the non-grant transmission time unit in Q non-grant transmission time units in which the non-grant resources are configured, in each non-grant transmission time unit, only the reservation version associated with the non-grant transmission time unit can be transmitted. The version numbers of the reservation versions associated with the unlicensed transmission time units within a particular unlicensed transmission time unit period may be predefined (eg, specified in a standard) or may be specified by the network device and notified to the terminal device using signaling. A network device may indicate a sequence of version numbers of reservation versions during a particular unit of transmission time without rights resolution, such as a sequence of version numbers S_R.V. = (RV_one, R.V.₂,…, RV_Q), where RV_oneindicates number version of the reservation version associated with the first ungranted transfer time unit in the period of the specific ungranted transfer time unit, RV₂ indicates the version number of the reservation associated with the second Ungranted Time Unit in the period of the specific Ungranted Time Unit and, similarly, RV_Q indicates the version number of the redundancy version associated with the Qth configured non-granted transmission time unit (namely, with a specific non-granted transmission time unit) in a specific non-granted transmission time unit period.

[0136] In retransmissions, the Modulation and Coding Scheme (MCS) used in different transmissions may be the same or different.

[0137] In an embodiment, the MCS is associated with a unit of non-grant transmission time. In particular, when sending data in an ungranted transmission time unit, the terminal device may use only the MCS associated with the ungranted transmission time unit and may not use another MCS. In this embodiment, the method shown in FIG. 9 may further include: determining, based on the non-granted transmission time unit index in which each transmission is performed in retransmissions, or the non-granted transmission time unit sequence number, the MCS to be used in each transmission. Since the MCS is related to the non-granted time unit, the network device can accurately know, based only on the non-granted time unit in which data is received, the MCS corresponding to the received data. The link relationship between the MCS and the non-granted transmission time unit may be predetermined (eg, specified in the standard), or may be specified by the network device and signaled to the terminal device using signaling. The network device may add a relationship between the MCS and the non-granted transmission time unit and the Q parameter to the same part of the signaling to send to the terminal device, or may add the relationship between the MCS and the non-grant transmission time unit to another signaling part to send to the terminal device. terminal device.

[0138] In an embodiment, the MCS is associated with each non-grant time unit in a specific non-grant time unit period. When data to be transmitted is transmitted using a non-grant resource in Q non-grant time units in a specific non-grant time unit period, only the MCS associated with the non-grant time unit can be used in each non-grant time unit. The MCS indexes associated with the non-grant time units in which the non-grant resources are configured and which are in the period of a particular non-grant time unit may be predefined (e.g., defined in a standard) or may be determined by a network device and notified to the terminal. alarm device. The network device may indicate the sequence of MCS indexes in the period of a particular unit of transmission time without permission, for example, the sequence of MCS indexes S_MCS = (MCS_one, MCS₂,…, MCS_Q), where MCS_one indicates the index of the MCS associated with the first non-grant time unit in the period of the specific non-grant time unit, MCS₂ indicates the MCS index associated with the second non-grant time unit in the period of the specific non-grant time unit, and similarly, MCS_Q indicates the MCS index associated with the Q-th unit of transmission time without permission, in period of a specific unit of transmission time without permission.

[0139] In an embodiment, if step S901 includes a step in which: if the first unit of non-grant transmission time that can be used in the first transmission of data to be transmitted is a specific unit of non-grant transmission time, then the terminal device uses the first unit of non-grant transmission time of non-granted transmission time after a certain non-granted transmission time unit as the non-granted transmission time unit used in the first transmission of the data to be transmitted.

[0140] It is understood that in the above embodiment, although the retransmission method provided in this embodiment of the present invention is described using an example in which resources without terminal device permission are inconsistent in the time domain, the method is also applicable to a scenario in in which the terminal device's ungranted resources are time domain sequential, and no change is required when the retransmission method is applied to a scenario in which the unauthorized resources are time domain sequential.

[0141] The present application further provides a specific example of the method provided in the embodiment shown in FIG. 9. In this example, each transmission in the retransmissions is performed in the non-grant transmission time unit in which the non-grant resource is configured for the terminal device, and is performed on the non-grant resource in the non-grant transmission time unit. An example is further described using an example in which the transmission time unit in FIG. 8 specifically is a slot. As shown in FIG. 10, the retransmission method in this example includes the following steps:

[0142] Step S1001: The terminal device performs the first transmission in retransmissions of data to be transmitted on the resource without permission in the (t+1)th slot n_t+1without permission (n_t+1 > 0), sets k=1, and executes step S1002.

[0143] Step S1002: The terminal device determines whether the (t+1+k - 1)-th slot n _t+1+k-1 without permission is a specific slot without permission, and if so, performs step S1004, in otherwise, performs step S1003.

[0144] Step S1003: The terminal device performs (k+1)-th transmission in retransmissions of data to be transmitted in (t+1+k)-th slot n_t+1+k without permission_, establishes k=k+1 and executes step S1002.

[0145] Step S1004: End the retransmission procedure. In particular, the terminal device performs k transmissions of data to be transmitted only in the slots without permission from (t+1)-th to (t+1+k-1)-th and not perform retransmissions of data to be transmitted in the (t+1+k)-th slot without permission and subsequent slots; and retransmissions are ended.

[0146] In this embodiment, the specific non-grant slot is a specific example of the specific non-grant transmission time unit, and the period in which the specific non-grant slot appears is Q slots in which the non-grant resources are configured. To determine the value of Q, refer to the associated description in the embodiment shown in FIG. 9.

[0147] In step S1002, the terminal device may determine, using the following method, whether the (t+1+k - 1)th slot n _t+1+k-1 without permission is a specific slot.

[0148] It is assumed that the slot sequence number n_t+1+k-1without resolution is Index_GF=t+1+k-1. If GF_T_Index=t+1+k-1 satisfies the following formula (9) or formula (10), then the terminal device may consider that the (t+1+k-1)th slot n_t+1+k-1 without permission is a specific slot, and after performing one transmission of data to be transmitted in the slot, terminates the retransmission procedure. Otherwise, the terminal device determines that the (t+1+k-1)th slot n_t+1+k-1 without permission is not a specific slot.

[0149] Formula (9) has the form GF_T_Index mod Q == 0; and

formula (10) has the form GF_T_Index mod Q == T_offset_value, where

T_offset_value is the preset time offset value referred to in the embodiments of FIG. 9 and FIG. 3, T_offset_value is an integer greater than 0 and less than Q, and T_offset_value may be preset (eg, specified in a standard) or may be specified by the network device and signaled to the terminal device using signaling.

[0150] FIG. 10 shows a specific example of the method shown in FIG. 9. In this example, Q=4, and the maximum number K of retransmissions supported by the terminal device is also 4. Retransmissions of data packet 1 are used as an example. The terminal device starts the first transmission in the retransmission in the (t+3)-th slot n _t+3 without grant, and when determining that the (t+4)-th slot n _t+4 without grant is a specific slot without grant, the terminal the device completes the retransmission procedure after performing one transmission of data packet 1 in slot n _t+4 without permission. In particular, the terminal device no longer performs the remaining two transmissions in retransmissions in the (t+5)th slot n _t+5 without grant and the (t+6)th slot n _t+6 without grant.

[0151] In step S1001 and step S1003, when the terminal apparatus performs one transmission in retransmissions of data to be transmitted, the following steps are included:

The terminal device determines, based on any of formulas (5) to (8) in the above embodiment, the HARQ process ID of the HARQ process used in the current transmission; and

sends data to be sent to the network device using a process corresponding to the HARQ process ID.

[0152] FIG. 11 shows an example of determining, using any of formulas (5) to (8), the HARQ process number used in each slot. In this example, Q=4 and the maximum number K of retransmissions supported by the terminal device is also 4. As can be seen from FIG. 11 that the terminal device performs the first two transmissions in data burst 1 retransmissions using HARQ process 0, and performs the first three transmissions in data burst 2 retransmissions using HARQ process 1. Based on the calculation using formulas (5) to (8), it can be known that the HARQ IDs corresponding to the non-granted transmission time units in the specific non-granted transmission time unit period are the same.

[0153] When detecting a specific transmission in the retransmissions of a certain data packet of the terminal device in the (t+k)-th slot without the permission of the terminal device, the network device also calculates according to any of formulas (5) - (8) the HARQ process number used for the packet data sent in slot t+k.

[0154] In another embodiment, the terminal device does not need to calculate the HARQ process number on each transmission, but only needs to calculate the HARQ process number on the first transmission, and it performs each subsequent transmission of the data to be transmitted using the process corresponding to the HARQ process number until the first specific slot after the first transmission.

[0155] The present application further provides a retransmission method. As shown in FIG. 15, the method can be applied to the network device 102 in the network shown in FIG. 2 and the method includes the following steps.

[0156] Step S1501: The network device detects on the resource without grant in unit n _{t+k-1 of} the time of transmission without grant n t+k-1 uplink data sent by the terminal device, determines based on the index of unit n _{t+k-1 of} time of transmission without grant or sequence number of the non-granted transmission time unit n _t+k-1 and the parameter Q corresponding to the terminal device, the number of the HARQ process used by the terminal device to send uplink data, where the non-granted transmission time unit is specifically a transmission time unit in which an unauthorized resource is configured for a terminal device.

[0157] In an embodiment, the network device may detect, by detecting a reference signal (which is referred to as a pilot signal), whether the terminal device is sending uplink data on a resource without a grant of one n_t+k-1transmission time without permission, and determine, based on the detected reference signal, the terminal device that sends the detected data.

[0158] In the non-grant transmission mechanism, the network device configures a reference signal for the terminal device, and each terminal device performs uplink transmission on the non-grant resource using the reference signal configured for the terminal device. During uplink transmission, the terminal device sends the uplink data and the reference signal configured for the terminal device to the network device on the resource without permission. The network device detects a reference signal on the resource without permission configured for the terminal device, and if the reference signal is detected, the network device considers that there is a terminal device that sends uplink data on the resource without permission, and further determines, based on the detected reference signal, a terminal device that sends uplink data. The reference signal configured by the network device for one terminal device may be different or the same as the reference signal configured for another terminal device. When a reference signal configured by a network device for one terminal device is the same as a reference signal configured for another terminal device, the network device can configure different non-grant resources (e.g., non-grant time-frequency resources) for terminal devices having the same reference signal, and the network device can determine the terminal device from which the uplink data is received, provided that the combinations of reference signals and unresolved time-frequency resources corresponding to any two terminal devices are different.

[0159] The network device may calculate the number of HARQ processes according to any of formulas (1), (2), (5), (6), (7) and (8) in the above embodiments, and the details are not described here again.

[0160] When a network device configures a plurality of non-grant resource sets for a terminal device and specifies different values of the Q parameter for the plurality of non-grant resource sets, the network device may determine, based on the non-grant resource on which uplink data is detected, the value of the Q parameter corresponding to the resource without permission, and compute the HARQ process number using the value of parameter Q corresponding to the resource without permission.

[0161] Step S1502: Uplink detected data is decoded.

[0162] In the embodiment, in step S1502, specifically: decoding only the uplink data received in unit n_t+k-1transmission time without permission. In another embodiment, step S1502 is specifically to decode the uplink data received at unit n_t+k-1transmission time without permission, and data in a buffer corresponding to the HARQ process number.

[0163] Step S1503: In case of incorrect decoding, the network device determines whether the non-grant transmission time unit n _t+k-1 is a specific non-grant transmission time unit. In this embodiment, the specific non-grant time unit is specifically non-grant time unit occurring periodically in non-grant time units, and the period of the specific non-grant time unit is Q non-grant time units.

[0164] For the network device to determine whether the current non-grant transmission time unit is a specific non-grant transmission time unit, see Formulas (3), (4), (9) and (10) in the above embodiments and the corresponding description. Details are not described here again.

[0165] If the non-grant time unit n _t+k-1 is a specific non-grant time unit, then the network device performs one of the following types of processing and completes the retransmission procedure:

processing (1): sending a feedback message to the terminal device, where the feedback message carries an indication indicating a wrong reception;

processing (2): sending uplink grant information for scheduling at the uplink data retransmission terminal device; and

processing (3): discarding the data without permission sent by the terminal device, and clearing the data in the buffer corresponding to the determined HARQ process number.

[0166] If the non-grant time unit n _t+k-1 is not a specific non-grant time unit, then the network device again receives uplink data in the next non-grant time unit of the terminal device. It should be noted that the same reservation version or a different uplink data redundancy reservation version can be adopted again.

[0167] In an embodiment, the feedback message further carries a specific HARQ process number and/or terminal device identifier.

[0168] In an embodiment, the uplink grant information includes time-frequency resource information used for retransmission of uplink data. In another embodiment, the uplink grant information may alternatively include one or more of the following information: specific HARQ process number, terminal device ID, reservation version number, MCS, TBS, power control parameter, reference signal information, and the like.

[0169] In an embodiment, the retransmission method shown in FIG. 15 may further include the following step:

[0170] Step S1504: In case of correct decoding, the network device sends to the terminal device a feedback message containing an indication indicating correct reception.

[0171] In an embodiment, when transmitting an indication indicating correct reception, the network device may optionally add the specific HARQ process number and/or terminal device identifier to the feedback message containing the indication indicating correct reception.

[0172] In another embodiment, in the case of correct decoding, the network device may not transmit any information to the terminal device, but continue to wait until the terminal device performs the remaining transmissions in retransmissions, and only when the first specific transmission time unit without permission after the transmission time unit in which the uplink data is detected arrives, send to the terminal device a feedback message containing an indication indicating correct reception after the first specific transmission time unit without permission.

[0173] An embodiment of the present invention further provides a terminal apparatus capable of performing the transmission method provided in the previous embodiments. As shown in FIG. 12, the device includes:

a processing unit 1201, configured to determine a non-grant transmission time unit used in the first transmission of data to be transmitted, where the non-grant transmission time unit is a transmission time unit in which the non-grant resource for the terminal device is configured;

a HARQ process determination unit 1202, configured to determine, based on the determined unit of non-grant transmission time, and the Q parameter of the HARQ process used to transmit data to be transmitted, where the value of Q is an integer greater than or equal to 1; and

a transmission unit 1203, configured: when the retransmission of the data to be transmitted does not stop before the first specific non-grant transmission time unit after the determined non-grant transmission time unit, to perform, starting from the specific non-grant transmission time unit, using the HARQ process, one transmission data to be transmitted on the non-grant transmission time unit configured for the terminal device in each non-grant transmission time unit until the last transmission of the data to be transmitted in the first specific non-grant transmission time unit, where the specific transmission time unit without permission is specifically a unit of non-grant transmission time periodically occurring in units of non-grant transmission time, and the period of the specific non-grant transmission time unit is Q.

[0174] For the specific implementation of the processing unit 1201, refer to step S901 and its related part in the above embodiment; for a specific implementation of block 1202 determine the HARQ process, refer to step S902 and related parts in the previous embodiment; and for the specific implementation of the transmission block 1203, refer to step S903 and its related part in the previous embodiment.

[0175] As shown in FIG. 13, an embodiment of the present invention further provides a terminal device. The terminal device includes a memory 1302, a transceiver 1303, and a processor 1301.

Memory 1302 is configured to store program and data. The memory can be Random Access Memory (RAM for short), Read Only Memory (ROM for short), or flash memory. The memory 1302 may be independently located within the communications device, or may be located within the processor 1301.

The transceiver 1303 may be used as a separate chip, or may be a transceiver circuit or used as an I/O interface in the processor 1301. The transceiver 1303 is configured to receive data sent by the network device and various types of signaling in the above embodiments, and is further configured to the ability to send data to be transmitted in the above embodiments. For example, the transceiver 1303 is configured to send data to be transmitted in step S303 in the embodiment shown in FIG. 3 and step S903 in the embodiment shown in FIG. 9.

The processor 1301 is configured to execute the program code stored in the memory 1302, and when the program code is executed, the processor 1301 is configured to execute step S301 and step S302 in the embodiment shown in FIG. 3 as well as step S901 and step S902 in the embodiment shown in FIG. 9.

[0176] Optionally, the transceiver 1303, the memory 1302, and the processor 1301 are connected using a bus.

[0177] For the specific implementation of each device in the terminal device 13, see the method embodiments shown in FIG. 3, fig. 4 and FIG. 9 and the corresponding description. Details are not described here again.

[0178] As shown in FIG. 16, an embodiment of the present invention further provides a network device. The network device includes:

HARQ process determination block 1601, configured to determine based on unit index n_t+k-1 time of non-granted transmission in which the uplink data sent by the terminal device is detected, or the unit sequence number n_t+k-1 transmission time without a permission and a Q parameter corresponding to the terminal device, a HARQ process number used by the terminal device to send uplink data, where the ungranted transmission time unit is specifically the transmission time unit in which the ungranted resource is configured for the terminal device;

a decoding unit 1602, configured to decode the detected uplink data;

evaluator 1603, configured to: when the uplink data failed to be decoded, determining whether the unit n_t+k-1 time transmissions without permission by a specific unit of transmission time without permission;

a sender 1604, configured: when the uplink data cannot be decoded, and the unit n_t+k-1 transmission time without permission is a specific unit of time of transmission without permission, sending to the terminal device a feedback message carrying an indication indicating correct reception or uplink permission information; and

a receiving unit 1605, configured: when the uplink data cannot be decoded, and the unit n_t+k-1 transmission time without permission is a specific unit of transmission time without permission, continuing to receive uplink data in the next unit of transmission time without permission of the terminal device.

[0179] For the specific implementation of the HARQ process determination block 1601, refer to step S1501 and its related part in the above embodiment; for the decoding block 1602, see step S1502 and the related part in the above embodiment; for the specific implementation of the evaluation unit 1603 and the send unit 1604, refer to step S1503 and its related part in the above embodiment; and for the specific implementation of the receive block 1605, refer to step S1504 and its related part in the above embodiment.

[0180] As shown in FIG. 17, an embodiment of the present invention further provides a terminal device. The terminal device includes a memory 1702, a transceiver 1703, and a processor 1701.

Memory 1702 is configured to store program and data. The memory can be Random Access Memory (RAM for short), Read Only Memory (ROM for short), or flash memory. The memory 1702 may be independently located within the communication device, or may be located within the processor 1701.

The transceiver 1703 may be used as a separate chip, or may be a transceiver circuit or used as an I/O interface in the processor 1701. The transceiver 1703 is configured to receive data sent by the network device and various types of signaling in the above embodiments, and is further configured to the ability to send data to be transmitted in the above embodiments. For example, the transceiver 1703 is configured to perform send processing in step S1503 and receive processing in step S1504 in the embodiment shown in FIG. fifteen.

The processor 1701 is configured to execute the program code stored in the memory 1702, and when the program code is executed, the processor 1701 is configured to execute the determination processing in steps S1501, S1502, and S1503 in the embodiment shown in FIG. fifteen.

[0181] Optionally, the transceiver 1703, the memory 1702, and the processor 1701 are connected using a bus.

[0182] For the specific implementation of each device in a network device, see the method embodiment shown in FIG. 19 and the corresponding description. Details are not described here again.

[0183] Another embodiment of the present invention provides another retransmission method. As shown in FIG. 18, in the method, each transmission in retransmissions is performed in a unit of transmission time without grant. The method includes the following steps.

[0184] Step S1801: Determine, based on parameter Q, the non-grant transmission time unit used in the first transmission of data to be transmitted, where Q is the non-grant transmission time unit period, in non-grant transmission time units that can be used in the first transmission in retransmissions, and the value of Q is greater than or equal to 1. For the non-grant transmission time unit in which the non-grant transmission resource (eg, the specific non-grant resource set in the previous embodiment) is located, configured in the specific configuration of the non-grant transmission resource of the terminal device , not all of the unauthorized transmission time can be used to make the first transmission in retransmissions, but only some units of the unauthorized transmission time can be used to make the first transmission in retransmissions. In other words, the first transmission in retransmissions can only be performed in some specific transmission time units without permission. In this embodiment, the Q parameter is a parameter used to define non-grant time units that can be used to perform the first transmission in retransmissions. In an embodiment, Q is the non-granted time unit period in non-granted time units that can be used in the first transmission in retransmissions, namely two adjacent non-granted time units that can be used in the first transmission in retransmissions, separated by (Q-1) ungranted transmission time units. In another implementation, Q is used to define a period, in a time domain resource, a unit of non-grant transmission time that can be used in the first transmission in retransmissions. For example, the period, in the time domain resource, of the non-granted transmission time units used in the first transmission in retransmissions is Q*P transmission time units, that is, the used two adjacent non-granted transmission time units in the first transmission in retransmissions are separated by ( Q*P-1) units of transmission time.

[0185] In an implementation, step S1801 may include determining, based on the parameter Q and the period P of the non-grant resource time domain, the non-grant transmission time unit used in the first transmission of data to be transmitted.

[0186] In an implementation, step S1801 may specifically include the following steps:

[0187] S1801a. The unit of transmission time without permission in the time domain resource is determined.

[0188] S1801b. It is determined, based on parameter Q, whether the non-grant transmission time unit determined in step S1801a is the non-grant transmission time unit that can be used in the first transmission in retransmissions, and if the non-grant transmission time unit determined in step S1801a is not is a non-granted transmission time unit that can be used in the first transmission in retransmissions, then continue with step S1801a to determine the next non-grant transmission time unit, and then perform step S1801 until a non-grant transmission time unit is found that may be used in the first transmission in retransmissions.

[0189] In the implementation in step S1801a, units of transmission time in the time domain resource, which are units of non-grant transmission time, may be determined based on the non-grant time domain period P of the resource. In another implementation, in step S1801a, transmission time units in the time domain resource, which are non-grant transmission time units, may be determined based on the period of the non-grant transmission time unit and the location in the time domain of the first non-grant transmission time unit.

[0190] FIG. 19 shows a specific unit of time that can be used in the first transmission in retransmissions according to this embodiment. In the figure, a solid line box schematically shows the non-grant time unit, and a dotted box schematically shows the non-grant time unit that can be used in the first transmission in retransmissions in non-grant time units.

[0191] In an implementation, the Q value may be specifically the maximum number K of retransmissions, or the Q parameter may be specifically the maximum number of retransmissions.

[0192] In an implementation, the step of determining the non-grant transmission time unit that may be used in the first transmission in retransmissions in step S1801 may specifically include the step of: determining based on a sequence number (e.g., "t+1" in Fig. 8) the non-granted transmission time unit and parameter Q the non-granted transmission time unit used in the first transmission of the data to be transmitted. In a specific embodiment, formula (3a) or formula (4a) can be used to determine.

[0193] Formula (3a) is GF_T_Index mod Q == 0; and

formula (4a) has the form GF_T_Index mod Q == T_offset_value, where

GF_T_Index is the non-grant transmission time unit sequence number determined in step S1801a, and T_offset_value is a preset time offset value, and may be configured by the network device and reported to the terminal device, or may be specified in the standard.

[0194] In another implementation, the step of determining the non-grant transmission time unit that can be used in the first transmission in retransmissions, in step S1801, may specifically include the step of: determining based on index (for example, "n_t+1» in Fig. 8) Unauthorized transmission time units and parameter Q, the unlicensed transmission time unit used in the first transmission of the data to be transmitted. In a specific embodiment, formula (3b), formula (4b), formula (3c) or formula (4c) can be used for determination.

[0195] Formula (3b) is (T_Index/P) mod Q == 0;

formula (3c) is ((T_Index - T_Index_Start)/P) mod Q == 0;

formula (4b) is (T_Index/P) mod Q == T_offset_value; and

formula (4c) is ((T_Index - T_Index_Start)/P) mod Q == T_offset_value, where

T_Index is the non-grant transmission time unit index determined in step S1801a, T_offset_value is a preset time offset value, T_Index_Start is the index of the first non-grant transmission time unit that is configured by the base station for the terminal device, P is the non-grant resource time domain period , P is an integer greater than or equal to 1, and T_offset_value and T_Index_Start may be configured by the base station and notified to the terminal device, or may be pre-negotiated by the terminal device and the base station (eg, specified in the standard).

[0196] It should be noted that when implementing the present invention, there is no limitation that step S1801 needs to be divided into two steps S1801a and S1801b for implementation.

[0197] In another implementation, step S1801 may specifically include: determining a transmission time unit whose index satisfies formula (4d) as an ungranted transmission time that can be used in the first transmission in retransmissions.

[0198] Formula (4d) has the form (T_index - T_Index_Start) mod (P*Q) == T_offset_value, where

T_index is the index of the transmission time unit, T_Index_Start is the index of the first non-grant transmission time unit, P is the resource's non-grant time domain period, Q is the period of the non-grant transmission time unit, in non-grant transmission time units that can be used in retransmissions , T_offset_value is a preset time offset value, and the value of T_offset_value may specifically be one of 0, P, 1*P, ... or (Q-1)*P.

[0199] Step S1802: Based on the determined unit of non-grant transmission time and the Q parameter, the HARQ process used to transmit the data to be transmitted is determined.

[0200] In an implementation, step S1802 may specifically include: determining a HARQ process based on a sequence number (e.g., "t+1" in FIG. 8) of the non-grant transmission time unit determined in step S1801, parameter Q and the maximum number of HARQ processes supported by the resource without the permission of the terminal device. In a particular implementation, the HARQ process number may be determined according to formula (5a) or formula (6a).

[0201] Formula (5a) is:

HARQ_ID = floor(GF_T_Index/Q) mod N_GF; and

formula (6a) has the form:

HARQ_ID = floor(GF_T_Index/Q) mod N_GF+H_offset_value where

floor() denotes rounding down, HARQ_ID is the HARQ process number, GF_T_Index is the sequence number of the ungranted transmission time unit, N_GF is the maximum number of HARQ processes supported by the resource without terminal device permission, and H_offset_value is a preset process number offset value.

[0202] In another implementation, step S1802 may specifically include the step of: determining the HARQ process number based on the index (e.g., "n _t+1 " in FIG. 8) of the non-grant transmission time unit determined in step S1801, parameter Q and the maximum number of supported HARQ processes. In a specific implementation, the HARQ process number may be determined by formula (7a) or formula (8a).

[0203] Formula (7a) is:

HARQ_ID = floor(T_Index/(P*Q)) mod N_GF; and

formula (8a) has the form:

HARQ_ID = floor(T_Index /(P*Q)) mod N_GF+H_offset_value where

floor() denotes rounding down, HARQ_ID is the HARQ process number, T_Index is the index of the ungranted transmission time unit, N_GF is the maximum number of HARQ processes supported by the resource without terminal device permission, H_offset_value is the preset process number offset value, P is the period time domain of the resource without permission, and P is an integer greater than or equal to 1.

[0204] In this embodiment, P, Q, N_GF, T_Index_Start, T_offset_value, and H_offset_value may be predefined (e.g., specified in the standard), may be specified by the network device and notified to the terminal device using signaling, or may be determined through negotiation between a network device and a terminal device. In an implementation, some parameters may be specified by the network device and other parameters may be specified in the standard, or all parameters may be specified by the network device, or all parameters may be specified in the standard. In this application, it is expressly not limited. When H_offset_value is specified by the network device, the network device may add P, N_GF, H_offset_value, and the Q parameter to the same signaling part to send to the terminal device, or may add P, N_GF, H_offset_value, and the Q parameter to different signaling parts to send to the terminal device. device.

[0205] When the non-grant resource configured by the network device for the terminal device includes a plurality of frequency resources, and for each frequency resource, the Q parameter, the HARQ process number corresponding to each frequency resource in the non-grant transmission time unit GF_T_Index (or T_index) is indicated is calculated using any of formulas (5a) - (8a) based on the Q parameter corresponding to each frequency resource. When the HARQ process number corresponding to each frequency resource is calculated using formula (6a) or (8a), different frequency resources may correspond to different preset process number offset values H_offset_value. The H_offset_value corresponding to each frequency resource may be predetermined (eg, specified in a standard), may be specified by the network device and notified to the terminal device using signaling, or may be determined by negotiation between the terminal device and the network device. When the H_offset_value is specified by the network device, the network device may add the H_offset_value corresponding to each frequency resource and the Q parameter to the same signaling part to send to the terminal device, or add the H_offset_value corresponding to each frequency resource to another part of the signaling to send to the terminal device. device. In another embodiment, the network device may indicate a Q parameter for a resource without permission, including a plurality of frequency resources. When a network device configures a plurality of resource sets without permission for a terminal device, the network device may optionally specify the Q parameter, H_offset_value, and N_GF for each device set. The terminal device may select one non-grant resource set from a plurality of non-grant resource sets for retransmission of data to be transmitted, and calculate the HARQ process number corresponding to the non-grant transmission time unit GF_T_Index (or T_index) in the non-grant resource set using any of the above formulas. (5)-(8) based on the parameter Q, H_offset_value, and N_GF corresponding to the unresolved resource set.

[0206] Step S1803: Perform, using the HARQ process determined in step S1802, the first transmission of data to be transmitted in the non-grant transmission time unit determined in step S1801.

[0207] In this embodiment, after the terminal device performs the first transmission of the data to be transmitted in the non-grant transmission time unit determined in step S1801, the terminal device may perform, using the HARQ process determined in S1802, another transmission in the retransmissions of the data to be transmitting data in the non-grant transmission time unit after the non-grant transmission time unit determined in step S1801, and stop retransmissions of data to be transmitted when the termination condition is met. Each transmission of the data to be transmitted is performed in the non-grant transmission time unit, and the non-grant resource configured for the terminal device in the non-grant transmission time unit is used. When the plurality of non-grant resources is configured in one unit of non-grant transmission time, the terminal device may select one or more non-grant resources from the plurality of non-grant resources, or even select all of the non-grant resources configured for the terminal device in the unit of transmission time without grant to transmit the subject data transfer.

[0208] In an implementation, the termination condition includes at least one of the following conditions:

termination condition A: the terminal device receives an ACK returned by the network device for data to be transmitted sent by the terminal device;

termination condition B: the terminal device receives, after performing a specific transmission (not the last transmission) in retransmissions, an uplink grant sent by the network device for data to be transmitted sent by the terminal device; and

Termination condition C: The maximum number of retransmissions has been reached.

[0209] In retransmissions, one reservation version of the data to be transmitted may be transmitted each time, and the reservation versions in different transmissions may be the same or different.

[0210] In an implementation, the reservation version is associated with a unit of transmission time without permission. Specifically, in the non-grant transmission time unit, the terminal apparatus may send only the reservation version associated with the non-grant transmission time unit and may not send the other version. In this embodiment, the method shown in FIG. 18 may further include: determining a reservation version of the data to be transmitted in each transmission based on the non-granted transmission time unit index in which each transmission is performed in retransmissions, or based on the non-grant transmission time unit sequence number, in which each transmission in retransmissions is performed. Since the reservation version is related to the non-granted transmission time unit, the network device can accurately know the reservation version information of the received data based only on the non-granted transmission time unit in which the data is received. The link relationship between the reservation version and the non-granted transmission time unit may be predetermined (eg, specified in the standard), or may be specified by the network device and signaled to the terminal device using signaling. The network device may add a relationship between the reservation version and the non-granted transmission time unit and the Q parameter to the same part of the signaling to send to the terminal device, or may add the relationship between the reservation version and the non-grant transmission time unit to another part of the signaling to send. to the terminal device.

[0211] In the method provided in the embodiment shown in FIG. 18, resources may be associated using a Q parameter. Q associated ungranted transmission time units are used in multiple retransmissions of the same data packet. The first non-grant time unit in Q related non-grant time units is used in the first retransmission of the data packet. Thus, upon detecting an uplink data packet of a terminal device in any of the Q associated non-grant time units, the network device can very easily determine the non-grant time unit in which the first transmission of the data packet occurs. performed. Therefore, this processing performed when the network device receives data transmitted using the retransmission mechanism becomes simple.

[0212] In another embodiment, the device shown in FIG. 12 may be configured to perform the method provided in the embodiment shown in FIG. 18. It should be noted that in this embodiment, the device shown in FIG. 12 may not need to perform the method in the embodiment shown in FIG. 18, or it may not be necessary to perform the method in another embodiment in this application.

[0213] The processing unit 1201 is configured to determine, based on the Q parameter, the non-grant transmission time unit used in the first transmission of the data to be transmitted, where Q is the period of the non-grant transmission time unit, in non-grant transmission time units that can be used in the first transmission in retransmissions, and the value of Q is greater than or equal to 1.

[0214] The HARQ process determiner 1202 is configured to determine, based on the determined unit of non-grant transmission time and the Q parameter of the HARQ process, a hybrid automatic retransmission request used to transmit data to be transmitted.

[0215] The transmission unit 1203 is configured to perform a first transmission of data to be transmitted using a specific HARQ process in a specific unit of transmission time without permission.

[0216] In this embodiment, for the specific implementation of the processing unit 1201, see step S1801 and its related part in the embodiment shown in FIG. eighteen; for a particular implementation of the HARQ process determination block 1202, refer to step S1802 and its related part in the embodiment shown in FIG. eighteen; and for the specific implementation of the transmission block 1203, refer to step S1803 and its related part in the embodiment shown in FIG. eighteen.

[0217] In another embodiment, the terminal device according to the diagram shown in FIG. 13 may be configured to perform the method provided in the embodiment shown in FIG. 18. It should be noted that in this embodiment, the terminal device shown in FIG. 13 may not need to perform the method in the embodiment shown in FIG. 18, or it may not be necessary to perform the method in another embodiment in this application. The transceiver 1303 is configured to: receive data sent by the network device and various types of signaling in the above embodiments, and is further configured to send data to be transmitted in the above embodiments. For example, the transceiver 1303 is configured to send data to be transmitted in step S1803 in the embodiment shown in FIG. 18. The processor 1301 is configured to execute the program code stored in the memory 1302, and when the program code is executed, the processor 1301 is configured to execute step S1801 and step S1802 in the embodiment shown in FIG. eighteen.

[0218] For data to be transmitted sent using the retransmission method in the embodiment shown in FIG. 18, the network device may also use the method described in the embodiment shown in FIG. 18 in determining the unit of time in which the first transmission is performed in retransmissions and the HARQ process used to transmit the data to be transmitted. Details are not described here again.

[0219] The present application further provides the following embodiments:

[0220] Embodiment 1: A retransmission method, the method including:

determining by the terminal device a non-grant transmission time unit used in the first transmission of data to be transmitted, where the non-grant transmission time unit is a transmission time unit in which the non-grant resource is configured for the terminal device;

determining, by the terminal device, based on the determined unit of non-grant transmission time and the Q parameter, the HARQ process used to transmit the data to be transmitted, where the value of Q is an integer greater than or equal to 1; and

when the retransmission of the data to be transmitted does not stop before the first specific non-grant transmission time unit after the specified non-grant transmission time unit, execution, by the terminal device, starting from the specific non-grant transmission time unit using the HARQ process, one transmission of the data to be transmitted, on non-grant transmission time unit configured for the terminal device in each non-grant transmission time unit until the last transmission of data to be transmitted is performed in the first specific non-grant transmission time unit, where the specific non-grant transmission time unit is specifically the non-grant transmission time unit. the period of a particular grant time unit, and the period of a specific non-grant time unit is Q.

[0221] Embodiment 2: The method according to Embodiment 11, where the parameter Q specifically represents the maximum number of retransmissions.

[0222] Embodiment 13: The method according to Embodiment 1, where the value of parameter Q is less than the maximum number of retransmissions.

[0223] Embodiment 24: The method according to any one of Embodiments 1 to 13, wherein the method further includes:

receiving, using the terminal device, information which carries the Q parameter and which is sent by the network device, and obtains the Q parameter from said information carrying the Q parameter.

[0224] Embodiment 5: The method according to any one of Embodiments 1 to 24, wherein the step of determining, by the terminal device, based on a certain unit of non-grant transmission time and Q parameter, the HARQ process used to transmit data to be transmitted comprises includes a stage where:

determining a HARQ process number based on a sequence number of a certain ungranted transmission time unit, the Q parameter, and the maximum number of HARQ processes supported by the terminal device's ungranted resource.

[0225] Embodiment 6: The method according to Embodiment 5, wherein the step of determining the HARQ process number based on the sequence number of the determined ungranted transmission time unit, parameter Q, and the maximum number of HARQ processes supported by the terminal device's ungranted resource includes stage where:

determine the HARQ process number according to the third formula or the fourth formula, where

the third formula is:

HARQ_ID = floor(GF_T_Index/Q) mod N_GF; and

the fourth formula is:

HARQ_ID = floor(GF_T_Index/Q) mod N_GF+H_offset_value where

floor() denotes rounding down, HARQ_ID is the HARQ process number, GF_T_Index is the ordinal number of the ungranted transmission time unit, N_GF is the maximum number of HARQ processes supported by the resource without terminal device permission, and H_offset_value is a preset process number offset value.

[0226] Embodiment 7: The method according to any one of Embodiments 1 to 24, wherein the step of determining, by the terminal device, based on a certain unit of non-grant transmission time and a Q parameter, a HARQ process used to transmit data to be transmitted, includes a stage where:

determining, based on the index of the determined ungranted transmission time unit, the Q parameter, and the maximum number of HARQ processes supported by the terminal device's ungranted resource, the HARQ process used to transmit the data to be transmitted.

[0227] Embodiment 8: The method according to Embodiment 7, wherein the step of determining, based on an index of a certain unit of ungranted transmission time, a Q parameter, and a maximum number of HARQ processes supported by the terminal device's ungranted resource, the HARQ process used for transmission of the data to be transmitted includes the step of:

determine the HARQ process number in accordance with the fifth formula or the sixth formula, where

the fifth formula is:

HARQ_ID = floor(T_Index/(P*Q)) mod N_GF; and

the sixth formula is:

HARQ_ID = floor(T_Index/(P*Q)) mod N_GF+H_offset_value where

floor() denotes rounding down, HARQ_ID is the HARQ process number, T_Index is the index of the ungranted transmission time unit, N_GF is the maximum number of HARQ processes supported by the resource without terminal device permission, H_offset_value is the preset process number offset value, P is the period time domain of the resource without the permission of the terminal device, and P is an integer greater than or equal to 1.

[0228] Embodiment 9: The method of any one of Embodiments 1 to 8, wherein the method further includes:

determining by the terminal apparatus whether the current non-grant transmission time unit is the first specific non-grant transmission time unit.

[0229] Embodiment 10: The method of Embodiment 9, wherein the step of determining, by the terminal device, whether the current non-grant transmission time unit is the first specific non-grant transmission time unit, includes the step of:

when the value obtained by performing a modulo Q operation on the sequence number of the current non-granted transmission time unit is 0 or a preset time offset value, the current non-granted transmission time unit is a specific non-granted transmission time unit.

[0230] Embodiment 11: The method of any one of Embodiments 1 to 10, wherein the method further includes:

determining a reservation version of the data to be transmitted in each transmission based on the serial number of the unentitled transmission time unit in which each transmission in the retransmissions is performed.

[0231] Embodiment 12: The method of any one of Embodiments 1 to 11, wherein the method further includes:

based on the sequence number of the non-granted transmission time unit in which each transmission in retransmissions is performed, the MCS to be used in each transmission is determined.

[0232] Embodiment 13: A terminal device, wherein the terminal device includes:

a processing unit configured to determine a non-grant transmission time unit used in the first transmission of data to be transmitted, where the non-grant transmission time unit is a transmission time unit in which the non-grant resource is configured for the terminal device;

a HARQ process determination unit, configured to determine, based on the determined unit of non-grant transmission time, and the Q parameter of the HARQ process used to transmit data to be transmitted, where the value of Q is an integer greater than or equal to 1; and

a transmission unit configured: when the retransmission of the data to be transmitted does not stop before the first specific non-grant transmission time unit after the specified non-grant transmission time unit, to perform, starting from the specific non-grant transmission time unit using the HARQ process, one transmission to be transmitted data, on the non-grant transmission time unit configured for the terminal device in each non-grant transmission time unit, until the last transmission of the data to be transmitted is performed in the first specific non-grant transmission time unit, where the specific non-grant transmission time unit is specifically, the non-grant time unit occurring periodically in non-grant time units, and the period of the specific non-grant time unit is Q.

[0233] Embodiment 2214: The terminal device according to Embodiment 13, where the parameter Q specifically is the maximum number of retransmissions.

[0234] Embodiment 15: The terminal device according to Embodiment 13, where the value of parameter Q is less than the maximum number of retransmissions.

[0235] Embodiment 16: The terminal device according to any one of Embodiments 13 to 15, wherein the terminal device further includes:

a receiving unit configured to: receive information that carries the Q parameter and that is sent by the network device, and obtain the Q parameter from said information carrying the Q parameter.

[0236] Embodiment 17: The terminal device according to any one of Embodiments 13 to 16, wherein the HARQ process determiner is specifically configured to:

determining a HARQ process number based on a sequence number of a certain ungranted transmission time unit, the Q parameter, and the maximum number of HARQ processes supported by the terminal device's ungranted resource.

[0237] Embodiment 18: The terminal device according to Embodiment 17, wherein determining the HARQ process number based on the sequence number of the specific ungranted transmission time unit, the Q parameter, and the maximum number of HARQ processes supported by the terminal device's ungranted resource includes:

determining the HARQ process number according to the third formula or the fourth formula, where

the third formula looks like:

HARQ_ID = floor(GF_T_Index/Q) mod N_GF; and

the fourth formula is:

HARQ_ID = floor(GF_T_Index/Q) mod N_GF+H_offset_value where

floor() denotes rounding down, HARQ_ID is the HARQ process number, GF_T_Index is the sequence number of the ungranted transmission time unit, N_GF is the maximum number of HARQ processes supported by the resource without terminal device permission, and H_offset_value is a preset process number offset value.

[0238] Embodiment 19: The terminal device according to any one of Embodiments 13 to 16, wherein the HARQ process definition unit is specifically configured to:

determining, based on an index of a certain unit of unlicensed transmission time, parameter Q, and a maximum number of HARQ processes supported by the resource without permission of the terminal device, the HARQ process used to transmit data to be transmitted.

[0239] Embodiment 20: The terminal device according to Embodiment 19, wherein determining, based on an index of a certain unit of ungranted transmission time, parameter Q, and a maximum number of HARQ processes supported by the resource without permission of the terminal device, the HARQ process used for transmission of the data to be transmitted includes:

determination of the HARQ process number according to the fifth formula or the sixth formula, where

the fifth formula looks like:

HARQ_ID = floor(T_Index/(P*Q)) mod N_GF; and

the sixth formula is:

HARQ_ID = floor(T_Index/(P*Q)) mod N_GF+H_offset_value where

floor() denotes rounding down, HARQ_ID is the HARQ process number, T_Index is the index of the ungranted transmission time unit, N_GF is the maximum number of HARQ processes supported by the resource without terminal device permission, H_offset_value is the preset process number offset value, P is the period time domain of the resource without permission, and P is an integer greater than or equal to 1.

[0240] Embodiment 21: The terminal device according to any of Embodiments 13 to 20, wherein the processing unit is further configured to:

determining whether the current non-granted transmission time unit is the first specific non-granted transmission time unit.

[0241] Embodiment 22: The terminal device of the apparatus according to Embodiment 21, wherein determining whether the current non-granted transmission time unit is the first specific non-granted transmission time unit includes:

when the value obtained by performing the operation of the Q module on the sequence number of the current non-grant transmission time unit in transmission units in which the configured non-grant resource is 0 or a preset time offset value, the current non-grant transmission time unit is a specific non-grant transmission time unit. permissions.

[0242] Embodiment 23: The terminal device according to any of Embodiments 13 to 22, wherein the processing unit is further configured to:

determining a reservation version of the data to be transmitted in each transmission based on the serial number of the unentitled transmission time unit in which each transmission is performed in the retransmissions.

[0243] Embodiment 24: The terminal device according to any of Embodiments 13 to 23, wherein the processing unit is further configured to:

determining, based on the sequence number of the non-granted transmission time unit in which each transmission in retransmissions is performed, the MCS to be used in each transmission.

[0244] In the above-described embodiments, the implementation of the object data in the uplink transmission is used as an example to describe the solutions of the present invention. It can be understood that the solutions provided in the above-described embodiments are also applicable to a scenario in which the uplink transmission object is uplink control information.

[0245] When the network device or terminal device is a chip, the network device or terminal device may be a user-programmable gate array, an integrated chip, a system chip, a central processing unit, a system processor, a digital signal processing circuit, or a microcontroller to implement the corresponding function, or may be programmable controller or other integrated circuit.

[0246] All or some of these chips may be implemented using software, hardware, firmware, or any combination thereof. When a program is used to implement the embodiments, all or some of the embodiments may be implemented as a computer program product. A computer program product includes computer instructions. When computer program instructions are downloaded and executed on a computer, all or some of the procedures or functions are generated in accordance with embodiments of the present application. The computer may be a general purpose computer, a dedicated computer, a computer network, or other programmable device. The computer instructions may be stored on a computer-readable storage medium or may be transferred from a computer-readable storage medium to another computer-readable storage medium. For example, computer instructions may be transmitted from a website, computer, server, or data center to another website, computer, server, or data center over a wired network (such as coaxial cable, fiber, or digital subscriber line, DSL)) or wirelessly (e.g. infrared, radio or microwave). A computer-readable storage medium can be any usable medium that is accessible to a computer, or a data storage device, such as a server or data center, that combines one or more usable media. The medium used may be a magnetic medium (eg floppy disk, hard disk or magnetic tape), an optical medium (eg DVD), a semiconductor medium (eg a solid state disk (SSD)) or the like.

Claims (69)

1. A retransmission method, comprising the steps of: determine by the terminal device the transmission time unit used in the first transmission of the data packet, wherein the determined transmission time unit is the transmission time unit in which the transmission resource is without permission and which is between two adjacent specific transmission time units, and is not the first time unit the transmission in which the ungranted transmission resource resides and which is between two adjacent specific transmission time units, the plurality of transmission time units contains the ungranted transmission resources between two adjacent specific transmission time units, the period of the specific transmission time unit in the time domain resource is Q time units transmission, and Q is an integer greater than 2; determining by the terminal device, based on the determined transmission time unit and the Q parameter, a hybrid automatic retransmission request HARQ process used to transmit the data packet; and when the retransmission of the data packet does not stop before the last specific transmission time unit in two adjacent specific transmission time units, the terminal apparatus performs, starting from the specific transmission time unit, using the HARQ process, one transmission of the data packet in each transmission time unit in which the transmission resource without permission, until the last transmission of the data packet is completed in the last specific transmission unit. 2. The method of claim 1, wherein the method further comprises the step of: receiving, by the terminal device, information which carries the parameter Q and which is sent by the network device, and obtaining the value of the parameter Q from said parameter-carrying information. 3. The method according to claim 1 or 2, wherein the step of determining, by the terminal device, based on the determined transmission time unit and the Q parameter, the HARQ process used to transmit the data packet, comprises the step of: determining a HARQ process number based on the index of the specific transmission time unit, the Q parameter, and the maximum number of supported HARQ processes. 4. The method of claim 3, wherein the step of determining the HARQ process number based on the index of the specific transmission time unit, the Q parameter, and the maximum number of supported HARQ processes comprises: determine the process number HARQ in accordance with the first formula or the second formula, where the first formula looks like: HARQ_ID = floor(T_Index/Q) mod N; and the second formula looks like: HARQ_ID = floor(T_Index/Q) mod N+H_offset_value, where floor() indicates rounding down, HARQ_ID is the HARQ process number, T_Index is the transfer time unit index, N is the maximum number of HARQ processes supported, and H_offset_value is a preset process number offset value. 5. The method according to any one of paragraphs. 1-4, wherein the method further comprises the step of: before performing each retransmission of the data packet, it is determined by the terminal device whether the current transmission time unit is the last specific time unit. 6. The method according to any one of paragraphs. 1-5, wherein the method further comprises the step of: determining a reservation version of the data packet in each transmission based on an index or sequence number of the transmission time unit in which each transmission is performed in the retransmissions. 7. The method of claim 6, wherein the method further comprises the step of: receiving reservation version information that is associated with each unit of transmission time and that is sent by the network device; and the step of determining the reservation version of the data packet in each transmission based on the index or sequence number of the transmission time unit in which each transmission is performed in retransmissions, comprising the step of: determining a reservation version or sequence number of a data packet in each transmission based on the received reservation version information and a transmission time unit index in which each transmission is performed in retransmissions. 8. Terminal device, containing: a processing unit configured to determine the transmission time unit used in the first transmission of the data packet, wherein the determined transmission time unit is the transmission time unit in which the transmission resource is located without permission and which is between two adjacent specific transmission time units, and is not the first transmission time unit in which the non-granted transmission time unit is located and which is between two adjacent specific transmission time units, the plurality of transmission time units comprise the non-grant transmission resources between two adjacent specific transmission time units, the period of the specific transmission time unit in the time domain resource is Q units of transmission time, and Q is an integer greater than 2; a HARQ process determining unit, configured to determine, based on the determined transmission time unit and the Q parameter, a hybrid automatic retransmission request HARQ process used to transmit the data packet; and a transmission unit configured: when the retransmission of a data packet does not stop until the last specific transmission time unit in two adjacent specific transmission time units, to perform, starting from the determined transmission unit, using the HARQ process, one transmission of the data packet in each transmission time unit where the ungranted transmission resource is located until the last transmission of the data packet is made in the last particular transmission unit. 9. The terminal device according to claim 8, wherein the terminal device further comprises: a first receiving unit, configured to: receive information that carries the Q parameter and that is sent by the network device, and obtain the Q parameter from said parameter-carrying information. 10. The terminal device according to claim 8 or 9, wherein the HARQ process definition unit is specifically configured to: determining a HARQ process number based on the index of the specific transmission time unit, the Q parameter, and the maximum number of supported HARQ processes. 11. The terminal device of claim 10, wherein determining the HARQ process number based on the index of the specific transmission time unit, the Q parameter, and the maximum number of supported HARQ processes comprises: determining the HARQ process number according to the first formula or the second formula, where the first formula looks like: HARQ_ID = floor(T_Index/Q) mod N; and the second formula looks like: HARQ_ID = floor(T_Index/Q) mod N+H_offset_value, where floor() indicates rounding down, HARQ_ID is the HARQ process number, T_Index is the transfer time unit index, N is the maximum number of HARQ processes supported, and H_offset_value is a preset process number offset value. 12. Terminal device according to any one of paragraphs. 8-11, wherein the processing unit is further configured to: before each retransmission of the data packet, determining whether the current transmission time unit is the last specific transmission time unit. 13. Terminal device according to any one of paragraphs. 8-12, wherein the processing unit is further configured to: determining the reservation version of the data packet in each transmission based on the index or sequence number of the transmission time unit in which each transmission is performed in the retransmissions. 14. Terminal device according to any one of paragraphs. 8-13, wherein the terminal device further comprises: a second receiving unit, configured to receive reservation version information that is associated with each unit of transmission time and that is sent by the network device; and the processing unit is configured to determine the reservation version of the data packet in each transmission based on the received reservation version information and the index or sequence number of the transmission time unit in which each transmission is performed in retransmissions. 15. A computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is run on the computer, the method according to any one of claims. 1-7 by computer. 16. Terminal device, containing: memory in which program code is stored, and a chip system comprising a processor configured to call program code from memory, upon execution of which the processor executes the method according to any one of paragraphs. 1-7. 17. A terminal device containing a processor and a transceiver, while the processor is configured to determine the transmission time unit used in the first transmission of the data packet, wherein the determined transmission time unit is the transmission time unit in which the transmission resource is located without permission and which is between two adjacent specific transmission time units, and is not the first unit of the transmission time in which the ungranted transmission resource is located and which is between two adjacent specific transmission time units, the plurality of transmission time units contains the ungranted transmission resources between two adjacent specific transmission time units, the period of the specific transmission time unit in the time domain resource is Q units transmission time, and Q is an integer greater than 2; the processor is further configured to determine, based on the determined transmission time unit and the Q parameter, the hybrid automatic retransmission request HARQ process used to transmit the data packet; and the transceiver is configured to: when the retransmission of a data packet does not stop before the last specific transmission time unit in two adjacent specific transmission time units, to perform, starting from a certain transmission unit, using the HARQ process, one transmission of a data packet in each transmission time unit, in which the transmission resource is located without permission, until the last transmission of the data packet is performed in the last specific transmission unit. 18. The terminal device of claim 17, wherein the transceiver is further configured to: receive information that carries the Q parameter and that is sent by the network device, and obtain the Q parameter from said parameter-carrying information. 19. The terminal device according to claim 17 or 18, wherein the processor is configured to: determining a HARQ process number based on the index of the specific transmission time unit, the Q parameter, and the maximum number of supported HARQ processes. 20. The terminal device of claim 19, wherein determining the HARQ process number based on the index of the specific transmission time unit, the Q parameter, and the maximum number of supported HARQ processes comprises: determining the HARQ process number according to the first formula or the second formula, where the first formula looks like: HARQ_ID = floor(T_Index/Q) mod N; and the second formula looks like: HARQ_ID = floor(T_Index/Q) mod N+H_offset_value, where floor() indicates rounding down, HARQ_ID is the HARQ process number, T_Index is the transmission time unit index, N is the maximum number of HARQ processes supported, and H_offset_value is a preset process number offset value. 21. Terminal device according to any one of paragraphs. 17-20, wherein the processor is further configured to: before each retransmission of the data packet, determining whether the current transmission time unit is the last specific transmission time unit. 22. Terminal device according to any one of paragraphs. 17-21, wherein the processor is further configured to: determining the reservation version of the data packet in each transmission based on the index or sequence number of the transmission time unit in which each transmission is performed in the retransmissions. 23. Terminal device according to any one of paragraphs. 17-22, wherein the transceiver is further configured to receive reservation version information that is associated with each unit of transmission time and that is sent by the network device; and the processor is configured to determine the reservation version of the data packet in each transmission based on the received reservation version information and the index or serial number of the transmission time unit in which each transmission is performed in retransmissions.

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