CN108631966B - Method and device for data transmission - Google Patents

Abstract

The application discloses a data transmission method and device. The method comprises the following steps: the first terminal equipment determines a retransmission time unit of the first information block; the first terminal device sends first data to a network device in the retransmission time unit, wherein the first data comprises a first symbol sequence obtained after the first information block is processed; the retransmission time unit is determined by the first terminal device according to the transmission sequence information of the first terminal device, the transmission sequence information of the first terminal device is determined by the first terminal device based on the position of the first terminal device in the first set, and the position of the first terminal device in the first set is determined by the first terminal device according to a preset algorithm. When the first terminal device needs to retransmit data, the network device can determine the retransmission time of the first terminal device, and does not need to reserve reference signal resources for the retransmission of the first terminal device, thereby improving the resource utilization rate.

Description

Method and device for data transmission

technical field

The present application relates to the field of communications, and more particularly, to a method and apparatus for data transmission.

Background technique

In the prior art, a grant-free solution is a solution in which a terminal device can send uplink data to the network device without requiring a scheduling authorization instruction from the network device. Specifically, the terminal device can send the data and the identifier of the terminal device to the network device, and the network device acquires the data and the identifier of the terminal device after correctly detecting the signal sent by the terminal device.

In the scheduling-free scheme, the terminal device can send data to the network device in a scheduling-based manner, or send data to the network device in a competition-based manner, wherein the scheduling-based method to send data refers to the resource dynamically indicated by the terminal device through the network device The contention-based method of sending data means that the terminal device to send data through the resources specified by the communication system.

Currently, when a terminal device transmits data in a contention-based manner, the network device needs to distinguish the number of times the current data transmission is transmitted according to different reference signals, which increases the burden on the base station, and the communication system needs to re-evaluate the data of the terminal device. More pilot resources are allocated for transmission. When data does not need to be retransmitted, the reference signal resources used for retransmission are wasted.

SUMMARY OF THE INVENTION

In view of this, the present application provides a method and apparatus for data transmission, which can realize scheduling-free retransmission and do not need to reserve reference signal resources for retransmission.

In one aspect, a method for data transmission is provided, the method comprising: a first terminal device determining a retransmission time unit of a first information block; the first terminal device sending a first information block to a network device in the retransmission time unit data, the first data includes the first symbol sequence obtained after the first information block is processed; wherein, the retransmission time unit is the sending sequence information of the first terminal device according to the first terminal device determined, the sending sequence information of the first terminal device is determined by the first terminal device based on the position of the first terminal device in the first set, where the first terminal device is in the first set The location of is determined by the first terminal device according to a preset algorithm.

In the data transmission method provided by this application, the first terminal device determines a retransmission time unit for sending retransmission data according to the position of the first terminal device in the first set, where the position is the first terminal device according to the preset position in the first set. A position determined by an algorithm in the terminal device and the network device, so that when the first terminal device needs to retransmit data, the network device can determine the retransmission time of the first terminal device, and the system does not need to retransmit data for the first terminal device Reference signal resources are reserved to improve resource utilization.

Optionally, before the first terminal device sends the first data to the network device in the retransmission time unit, the method further includes: the first terminal device receives a negative acknowledgement NACK from the network device, wherein, The NACK is used to indicate that the decoding of the second data fails, and the second data includes a second symbol sequence obtained after the first information block is processed; the first terminal device determines to retransmit the first information block according to the NACK. a block of information.

Thus, the first terminal device may determine that the second data is not successfully transmitted according to the NACK sent by the network device, and determine to retransmit the information block (ie, the first information block) corresponding to the second data according to the NACK.

Optionally, the method further includes: receiving, by the first terminal device, location information of a first set from the network device, where the location information is used to indicate the number of locations included in the first set, the location information The information is used by the first terminal device to determine the location of the first terminal device in the first set.

After receiving the data sent by at least one terminal device (including the first terminal device), the network device can determine the number of locations included in the first set according to the detection of the above-mentioned data, and send location information to the at least one terminal device. When the first terminal device receives the location information, it determines the location of the first terminal device in the first set according to the location information and a corresponding algorithm, so that the time unit in which the first terminal device sends data can be determined.

Optionally, the second terminal device is located in the same position in the first set as the first terminal device.

The second terminal device is any retransmission terminal device in the first set that is different from the first terminal device. After the terminal devices in the same access time slot compete for access, the feedback message received is a NACK terminal device It can be arranged in the same position in the queue according to a predetermined rule, and the network device also determines the position according to the predetermined rule, so that multiple terminal devices that may retransmit in different access time slots can retransmit in one access time slot. , improving resource utilization.

Optionally, the method further includes: determining, by the first terminal device, resources used for retransmission of the first information block according to resources used for initial transmission of the first information block.

In this application, multiple retransmitted terminal devices located at the same position in the queue may perform retransmission according to the resources used for initial transmission by the multiple retransmitted terminal devices, and the network device may perform initial transmission according to the multiple retransmitted terminal devices. The used resources (excluding time domain resources) receive retransmission data, and the resources may be frequency domain resources, reference signals, or other resources, so that the receiving complexity of the network device can be reduced.

Optionally, the first set is a set of terminal devices that send retransmission data.

Retransmission terminal devices may be queued individually, that is, the first set is the set of terminal devices that transmit retransmission data. Therefore, the communication system can uniformly manage the terminal equipment that sends the retransmitted data, for example, allocate resources to the terminal equipment that sends the retransmitted data, so as to improve the reliability of uplink data transmission.

Optionally, the method further includes: determining, by the first terminal device, a retransmission time unit of the first information block according to the number of retransmission positions M and the position of the first terminal device in the first set , wherein the M is used to instruct the terminal devices in the M locations in the first set to send data in the retransmission time unit, and the M is a positive integer.

The network device can determine the number of retransmission locations according to the available resources. If there are more resources available, the network device can set the number of retransmission locations to a larger value and send it to the terminal device; If the number of retransmission locations is less, the network device can set the number of retransmission locations to a smaller value and send it to the terminal device; or, the number of retransmission locations M is equal to the number K of resources available in the retransmission time unit by default. When the number of positions in the M is equal to or greater than K, then the next access slot is the retransmission time unit, and the terminal equipment corresponding to the M positions included in the first set sends retransmissions in the access slot The number of retransmission locations is equal to the number of resources available in the retransmission time unit by default, which means that the network device and the terminal devices in the first set can respectively determine that the number of retransmission locations is equal to The number of resources available in the retransmission time unit. Therefore, the network device can flexibly determine the number of terminal devices that send retransmitted data within a time unit according to the actual situation, thereby improving resource utilization and reliability of uplink data transmission.

Optionally, the method further includes: when the number of times of transmission of the first information block satisfies an exit condition, the first terminal device exits the first set.

In this application, when the feedback information received by the terminal device is NACK or collision, it means that the data has not been successfully transmitted, and the terminal devices in the first set may still fail to send the data after multiple transmissions. Influenced by other terminal devices in the set, a terminal device that fails to send data after multiple transmissions can exit the first set, that is, it will no longer compete for resources with other terminal devices in the first set, so that the data of other terminal devices can be improved. The probability of a successful transmission.

Optionally, the method further includes: the first terminal device receiving first indication information from a network device, where the first indication information is used to indicate that resources used by the first terminal device to send data are not used or are not used The network device does not detect any terminal device on the resource used by the first terminal device to send data; the first terminal device exits the first set according to the first indication information.

When the number of locations included in the first set is large (greater than or equal to 2), other terminal devices cannot determine which terminal devices exit the first set, except that the terminal devices that meet the exit conditions can determine themselves to exit the first set. the first set, which may result in incorrect sorting results. In the data transmission method provided by the present application, the first indication information is fed back to the terminal equipment that needs to exit the first set, so that the terminal equipment that is sorting can be prevented from determining an incorrect data sending order.

Optionally, the method further includes: the first terminal device receiving second indication information from a network device, where the second indication information is used to instruct the first terminal device to exit the first set; the first terminal device A terminal device exits the first set according to the second indication information.

When the number of locations included in the first set is large (greater than or equal to 2), other terminal devices cannot determine which terminal devices exit the first set, except that the terminal devices that meet the exit conditions can determine themselves to exit the first set. the first set, which may result in incorrect sorting results. In the data transmission method provided by the present application, the second indication information is fed back to the terminal equipment that needs to exit the first set, so that the terminal equipment that is being sorted can be prevented from determining an incorrect data sending order.

Optionally, before the first terminal device determines the retransmission time unit, the method includes: the first terminal device receives third indication information or fourth indication information from the network device, wherein the first The third indication information is used to instruct the second terminal device to quit the first set, and the fourth indication information is used to indicate that the resources used by the second terminal device to send data are not used or the network device is not in the first set. Any terminal device is detected on the resources used by the second terminal device to send data; the first terminal device determines, according to the third indication information or the fourth indication information, whether the first terminal device is in the first set Location.

In this application, when the second terminal device needs to exit the first set, for example, when the number of transmissions of the second terminal device satisfies the exit condition, the network device may send third indication information to the first terminal device and the second terminal device or fourth indication information, wherein the second terminal device is a terminal device in the first set whose number of transmissions satisfies the exit condition, and the first terminal device determines that the second terminal device exits the first set according to the third indication information or the fourth indication information, Thus, the first terminal device can correctly determine the position of the first terminal device in the first set.

On the other hand, the present application provides a data transmission method, the method includes: a network device determines a retransmission time unit of a first terminal device; the network device detects the first terminal device in the retransmission time unit The first data sent, the first data includes the first symbol sequence obtained after the first information block is processed; wherein, the retransmission time unit is the sending sequence information of the network device according to the first terminal device determined, the sending sequence information of the first terminal device is determined by the network device based on the position of the first terminal device in the first set, and the position of the first terminal device in the first set is determined by the network device according to a preset algorithm.

In the data transmission method provided by the present application, the network device determines the retransmission time unit used by the first terminal device to send the retransmission data according to the position of the first terminal device in the first set, and the position is the network device according to the preset position in the first set. A position determined by an algorithm in the terminal device and the network device, so that when the first terminal device needs to retransmit data, the network device can determine the retransmission time of the first terminal device, and the system does not need to retransmit data for the first terminal device Reference signal resources are reserved to improve resource utilization.

Optionally, before the network device detects the first data sent by the first terminal device in the retransmission time unit, the method further includes: the network device sends a negative acknowledgement (NACK) to the first terminal device , wherein the NACK is used to indicate that the decoding of the second data fails, and the second data includes a second symbol sequence obtained after the first information block is processed.

Thus, the first terminal device may determine that the second data is not successfully transmitted according to the NACK sent by the network device, and determine to retransmit the information block (ie, the first information block) corresponding to the second data according to the NACK.

Optionally, the method further includes: the network device sending location information of the first set to the first terminal device, where the location information is used to indicate the number of locations included in the first set, so as to facilitate all The first terminal device determines the location of the first terminal device in the first set according to the location information.

After receiving the data sent by at least one terminal device (including the first terminal device), the network device can determine the number of locations included in the first set according to the detection of the uplink data, and send location information to the at least one terminal device. When the terminal device receives the location information, it determines the location of the terminal device in the first set according to the location information and a corresponding algorithm, so that the time unit in which the terminal device sends data can be determined.

Optionally, the second terminal device is located in the same position in the first set as the first terminal device.

The second terminal device is any retransmission terminal device in the first set that is different from the first terminal device. After the terminal devices in the same access time slot compete for access, the feedback message received is a NACK terminal device It can be arranged in the same position in the queue according to a predetermined rule, and the network device also determines the position according to the predetermined rule, so that multiple terminal devices that may retransmit in different access time slots can retransmit in one access time slot. , improving resource utilization.

Optionally, the method further includes: determining, by the network device, resources used for retransmission of the first information block according to resources used for initial transmission of the first information block.

In this application, multiple retransmitted terminal devices located at the same position in the queue may perform retransmission according to the resources used for initial transmission by the multiple retransmitted terminal devices, and the network device may perform initial transmission according to the multiple retransmitted terminal devices. The used resources (excluding time domain resources) receive retransmission data, and the resources may be frequency domain resources, reference signals, or other resources, so that the receiving complexity of the network device can be reduced.

Optionally, the first set is a set of terminal devices that send retransmission data.

Retransmission terminal devices may be queued individually, that is, the first set is the set of terminal devices that transmit retransmission data. Therefore, the communication system can uniformly manage the terminal equipment that sends the retransmitted data, for example, allocate resources to the terminal equipment that sends the retransmitted data, so as to improve the reliability of uplink data transmission.

Optionally, the method further includes: determining, by the network device, a retransmission time unit of the first information block according to the number of retransmission locations M and the location of the first terminal device in the first set, wherein , where the M is used to instruct the terminal devices in the M locations in the first set to send data in the retransmission time unit, where M is a positive integer.

The network device can determine the number of retransmission locations according to the available resources. If there are more resources available, the network device can set the number of retransmission locations to a larger value and send it to the terminal device; If the number of retransmission locations is less, the network device can set the number of retransmission locations to a smaller value and send it to the terminal device; or, the number of retransmission locations M is equal to the number K of resources available in the retransmission time unit by default. When the number of positions in the M is equal to or greater than K, then the next access slot is the retransmission time unit, and the terminal equipment corresponding to the M positions included in the first set sends retransmissions in the access slot The number of retransmission locations is equal to the number of resources available in the retransmission time unit by default, which means that the network device and the terminal devices in the first set can respectively determine that the number of retransmission locations is equal to The number of resources available in the retransmission time unit. Therefore, the network device can flexibly determine the data of the terminal device that sends the retransmitted data within a time unit according to the actual situation, which improves the resource utilization rate and the reliability of uplink data transmission.

Optionally, the method further includes: when the number of times of transmission of the first information block satisfies an exit condition, the network device determines that the first terminal device exits the first set.

In this application, when the feedback information received by the terminal device is NACK or collision, it means that the data has not been successfully transmitted, and the terminal devices in the first set may still fail to send the data after multiple transmissions. Influenced by other terminal devices in the set, a terminal device that fails to send data after multiple transmissions can exit the first set, that is, it will no longer compete for resources with other terminal devices in the first set, so that the data of other terminal devices can be improved. The probability of a successful transmission.

Optionally, the method further includes: sending, by the network device, first indication information, where the first indication information is used to indicate that resources used by the first terminal device to send data are not used or the network device is not in use Any terminal device is detected on the resource used by the first terminal device to send data.

When the number of included positions in the queue is large (greater than or equal to 2), other terminal devices cannot determine which terminal devices have exited the queue, except that the terminal devices that meet the exit conditions can determine that they have exited the queue. May cause incorrect sorting results.

Optionally, the method further includes: sending, by the network device, second indication information, where the second indication information is used to instruct the first terminal device to quit the first set.

When the number of included positions in the queue is large (greater than or equal to 2), other terminal devices cannot determine which terminal devices have exited the queue, except that the terminal devices that meet the exit conditions can determine that they have exited the queue. May cause incorrect sorting results. In the data transmission method provided by the present application, the second indication information is fed back to the terminal device that needs to exit the queue, so that the terminal device in the queue can be prevented from determining an incorrect data sending sequence.

In yet another aspect, the present application provides a data transmission device, which can implement the functions performed by the first terminal device in the methods involved in the above aspects, and the functions can be implemented by hardware, or corresponding software can be executed by hardware. accomplish. The hardware or software includes one or more units or modules corresponding to the above functions.

In a possible design, the structure of the apparatus includes a processor and a transceiver, and the processor is configured to support the apparatus to perform the corresponding functions in the above method. The transceiver is used to support communication between the device and other network elements. The apparatus may also include a memory, coupled to the processor, which holds program instructions and data necessary for the apparatus.

In another aspect, the present application provides a data transmission apparatus, which can implement the functions performed by the network equipment in the methods involved in the above aspects, and the functions can be implemented by hardware or by executing corresponding software in hardware. The hardware or software includes one or more units or modules corresponding to the above functions.

In a possible design, the structure of the apparatus includes a processor and a transceiver, and the processor is configured to support the apparatus to perform the corresponding functions in the above method. The transceiver is used to support communication between the device and other network elements. The apparatus may also include a memory, coupled to the processor, which holds program instructions and data necessary for the apparatus.

In yet another aspect, a computer program product is provided, the computer program product comprising: computer program code, when the computer program code is executed by a communication unit, a processing unit or a transceiver, or a processor of a terminal device, the computer program code enables a first The terminal device executes the method in the above implementation manner.

In yet another aspect, a computer program product is provided, the computer program product comprising: computer program code, when the computer program code is executed by a communication unit, a processing unit or a transceiver, or a processor of a terminal device, the network device Execute the method in the above implementation.

In another aspect, the present application provides a computer storage medium for storing computer software instructions used by the above-mentioned first terminal device, which includes the program designed for executing the above-mentioned aspects.

In another aspect, the present application provides a computer storage medium for storing computer software instructions used by the above-mentioned network device, which includes the program designed for executing the above-mentioned aspects.

Description of drawings

FIG. 1 is a schematic architecture diagram of a communication system applicable to the present application;

2 is a schematic flowchart of a method for data transmission provided by the present application;

3 is a schematic diagram of a format of an uplink message provided by the present application;

4 is a schematic flowchart of another method for data transmission provided by the present application;

5 is a schematic flow chart of still another method for data transmission provided by the present application;

6 is a schematic flow chart of still another method for data transmission provided by the present application;

FIG. 7 is a schematic flow chart of still another data transmission method provided by the present application;

8 is a schematic flow chart of still another method for data transmission provided by the present application;

FIG. 9 is a schematic flowchart of still another method for data transmission provided by the present application;

FIG. 10 is a schematic flowchart of still another data transmission method provided by the present application;

11 is a schematic structural diagram of a possible first terminal device provided by the present application;

12 is a schematic structural diagram of another possible first terminal device provided by the present application;

13 is a schematic structural diagram of a possible network device provided by the present application;

FIG. 14 is a schematic structural diagram of another possible network device provided by this application.

Detailed ways

The technical solutions in the present application will be described below with reference to the accompanying drawings.

FIG. 1 shows a communication system 100 to which the present application is applicable. The communication system 100 includes a network device 110 and a terminal device 120. The network device 110 communicates with the terminal device 120 through a wireless network. When the terminal device 120 sends data, the wireless communication module can encode the information for transmission. Specifically, The wireless communication module may obtain a certain number of data bits to be sent over the channel to the network device 110, such as data bits generated by the processing module, received from other devices, or stored in the storage module. These data bits may be contained in one or more transport blocks (also referred to as information blocks), which may be segmented to produce multiple encoded blocks.

In this application, terminal equipment may be referred to as access terminal, user equipment (UE), subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile equipment, user terminal, terminal, wireless Communication equipment, user agent or user equipment. Access terminals can be cellular phones, handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, and user equipment in 5th-Generation (5G) systems .

The network device may be a base transceiver station (BTS) in a code division multiple access (CDMA) system, or a base station (node) in a wideband code division multiple access (WCDMA) system B, NB), it can also be an evolved base station (evolutional node B, eNB) in a long term evolution (long term evolution, LTE) system, and can also be a base station (gNB) in a 5G system. The device may also be a relay station, an access point, an in-vehicle device, a wearable device, and other types of devices.

In addition, in an LTE system or a 5G system, multiple cells can work on the same frequency at the same time. In some special scenarios, the concepts of a carrier and a cell can also be considered equal. For example, in a carrier aggregation (CA) scenario, when a secondary carrier is configured for a terminal device, both the carrier index of the secondary carrier and the cell identity of the secondary cell operating on the secondary carrier are carried. In this case, It can be considered that the concepts of a carrier and a cell are equivalent, for example, a terminal device accessing a carrier is equivalent to accessing a cell.

The above communication systems applicable to the present application are only examples, and the communication systems applicable to the present application are not limited thereto. For example, the number of network devices and terminal devices included in the communication system may also be other numbers.

In order to facilitate the understanding of the present application, the concepts that may be involved in the present application are described in detail below.

Scheduling-free transmission can be understood as any one of the following meanings, or multiple meanings, or a combination of some technical features in multiple meanings, or other similar meanings:

Scheduling-free transmission may refer to: the network equipment pre-allocates and informs the terminal equipment of multiple transmission resources; when the terminal equipment has uplink data transmission requirements, it selects at least one transmission resource from the multiple transmission resources pre-allocated by the network equipment, and uses the selected transmission resource. The resource sends uplink data; the network device detects the uplink data sent by the terminal device on one or more transmission resources in the multiple pre-allocated transmission resources. The detection may be blind detection, detection may also be performed according to a certain control field in the uplink data, or detection may be performed in other manners.

Scheduling-free transmission may refer to: the network device pre-allocates and informs the terminal device of multiple transmission resources, so that when the terminal device has an uplink data transmission requirement, it selects at least one transmission resource from the multiple transmission resources pre-allocated by the network device, and uses the selected transmission resource. transmission resources to send uplink data.

Scheduling-free transmission may refer to acquiring information of multiple pre-allocated transmission resources, selecting at least one transmission resource from the multiple transmission resources when there is a demand for uplink data transmission, and using the selected transmission resource to send uplink data. The obtaining method can be obtained from the network device.

Scheduling-free transmission may refer to a method for realizing uplink data transmission of terminal equipment without the need for dynamic scheduling by network equipment. A way of scheduling. Optionally, realizing the uplink data transmission of the terminal equipment can be understood as allowing the data of two or more terminal equipments to perform uplink data transmission on the same time-frequency resource. Optionally, the transmission resources may be transmission resources of one or more transmission time units after the time when the terminal device receives the signaling. A transmission time unit may refer to a minimum time unit of one transmission, such as a transmission time interval (transmission time interval, TTI).

Scheduling-free transmission may refer to: the terminal device performs uplink data transmission without the need for scheduling by the network device. The scheduling may refer to that the terminal device sends an uplink scheduling request to the network device, and after receiving the scheduling request, the network device sends an uplink grant to the terminal device, wherein the uplink grant indicates uplink transmission resources allocated to the terminal device.

Scheduling-free transmission may refer to: a contention transmission manner, and specifically may refer to multiple terminals performing uplink data transmission on the same pre-allocated time-frequency resource without the need for a base station to perform scheduling.

The data may be service data or signaling data.

The blind detection can be understood as detection of data that may arrive without predicting whether or not data will arrive. The blind detection can also be understood as detection without explicit signaling indication.

In the present application, the basic time unit of unscheduled transmission may be one TTI (eg, including a short transmission time interval (sTTI)). When the sTTI technology is introduced, scheduling-free transmission may include reception on a downlink data channel or transmission on an uplink data channel with a TTI length of 1 millisecond (ms) or a TTI length of less than 1 ms.

In this application, the time-frequency resources used by the network device and the terminal device to transmit information may be the time-frequency resources used based on the contention mechanism, or the time-frequency resources used based on the non-contention mechanism. Time-frequency resources, the terminal device can detect whether a certain time-frequency resource is currently in an idle state, or whether the time-frequency resource is used by other devices, if the time-frequency resource is in an idle state, or the time-frequency resource is not used by other devices. If the time-frequency resource is used by the device, the terminal device can use the time-frequency resource for communication, such as uplink transmission; if the time-frequency resource is not in an idle state, or the time-frequency resource has been used by other devices, the terminal device cannot use it the time-frequency resource. It should be noted that, in the present application, the specific method and process of the above competition mechanism may be similar to the prior art, and the detailed description thereof is omitted here in order to avoid redundant description.

In this application, the time-frequency resources used by the communication system 100 (or, in other words, the time-frequency resources used by network equipment and terminal equipment based on the competition mechanism) may be licensed time-frequency resources or license-free time-frequency resources. This is not limited. In this application, each communication device (eg, network device or terminal device) in the communication system 100 may use time-frequency resources for communication based on a scheduling-free transmission scheme, or may use time-frequency resources for communication based on a scheduling method. This is not limited.

In this application, the resources used by the network device and the terminal device to transmit information may be divided into multiple time units in the time domain, and the multiple time units may be continuous or some adjacent time units There is a preset interval therebetween, which is not limited in this application.

In this application, the length of a time unit can be arbitrarily set, which is not limited in this application.

For example, 1 time unit may include one or more subframes.

Alternatively, 1 time unit may include one or more slots or mini-slots.

Alternatively, 1 time unit may include one or more time domain symbols.

Alternatively, 1 time unit may include one or more TTIs or sTTIs.

Alternatively, 1 time unit has a length of 1 ms.

Alternatively, the length of 1 time unit is less than 1 ms.

The TTI is a time parameter commonly used in existing communication systems, and is a time unit for scheduling data in the communication system. In the LTE system, the time length of one TTI is 1 ms, which corresponds to the time length of one sub-frame (sub-frame), that is, the time length of two time slots.

In this application, data transmission may be scheduled based on network equipment, and the basic time unit of the scheduling is one or more minimum time scheduling units, where the minimum time scheduling unit may be the above-mentioned TTI, or the above-mentioned sTTI. The specific scheduling process is that the base station sends a control channel, for example, a physical downlink control channel (PDCCH) or an enhanced physical downlink control channel (EPDCCH) or a physical downlink control channel (sTTIphysical) for scheduling sTTI transmissions downlink control channel, sPDCCH), the control channel can carry different downlink control information (downlink control information, DCI) formats for scheduling physical downlink shared channel (physical downlink shared channel, PDSCH) or physical uplink shared channel (physical uplink shared channel) channel, PUSCH) scheduling information, the scheduling information includes resource allocation information, modulation and coding methods and other control information. The terminal device detects the control channel, and performs the reception of the downlink data channel or the transmission of the uplink data channel according to the scheduling information carried in the detected control channel.

The present application does not limit the spectrum resources used by the communication system 100, which may be licensed spectrum, unlicensed spectrum, or other shared spectrum.

Concepts that may be involved in the present application have been introduced in detail above, and the data transmission method and apparatus provided in the present application will be described in detail below with reference to the accompanying drawings.

FIG. 2 shows a schematic interaction diagram of a method 200 for data transmission provided by the present application. The method 200 includes:

S210: The first terminal device determines a retransmission time unit of the first information block.

S220: The first terminal device sends first data to the network device in the retransmission time unit, where the first data includes a first symbol sequence obtained after the first information block is processed.

The retransmission time unit is determined by the first terminal device according to the sending sequence information of the first terminal device, and the sending sequence information of the first terminal device is determined by the first terminal device based on the first terminal device. The position of a terminal device in the first set is determined, and the position of the first terminal device in the first set is determined by the first terminal device according to a preset algorithm.

In S210, the first set is a set of at least one terminal device including the first terminal device, the at least one terminal device forms the first set, the at least one terminal device in the first set is arranged in order, and each terminal device occupies For a location in the first set, the same location may be jointly occupied by multiple terminal devices. The arrangement order of the at least one terminal device in the first set corresponds to the data transmission order of the at least one terminal device. For example, for the first terminal device, the data transmission order may be the same as its arrangement order, or it may be preset The rules specified by the network device or the rules specified by the network device correspond to their arrangement order. The position of the first terminal device in the first set is determined by the first terminal device according to a corresponding algorithm. In the first terminal device and the network device, the first terminal device and the network device can respectively determine the position of the first terminal device in the first set, so that the network device can determine the time unit in which the first terminal device sends data, the time unit Specifically, it may be the time unit in which the first terminal device sends the retransmission data, that is, the retransmission time unit.

In this application, sending data by a terminal device in one time unit means that the terminal device sends data based on resources corresponding to the time unit, and resources corresponding to different time units are different.

For example, different resources corresponding to different time units may refer to different time units corresponding to the same time domain resources and different frequency domain resources.

Alternatively, different resources corresponding to different time units may refer to different time units corresponding to different time domain resources and the same frequency domain resources.

Alternatively, different resources corresponding to different time units may refer to different time units corresponding to different time domain resources and different frequency domain resources.

Alternatively, different resources corresponding to different time units may refer to different time units corresponding to the same time-frequency resources and different code domain resources.

In S220, after determining the retransmission time unit, the first terminal device sends first data to the network device in the retransmission time unit, where the first data is retransmission data, and the first data includes a first information block The first symbol sequence obtained after being processed by the first terminal device (eg, coded modulation, rate matching, etc.).

In this application, the first set may be a queue, a heap, a stack, or other forms, and the specific form of the first set is not limited in this application. Therefore, in this application, the description of queues is sometimes used only to facilitate understanding of the technical solution, and should not be considered as a limitation of this application.

It should also be understood that, in this application, the first terminal device is any terminal device, and the first information block is any information block to be sent, which should not be construed as a limitation on this application.

To sum up, in the data transmission method provided by the present application, the first terminal device determines the retransmission time unit for sending the retransmission data according to the position of the first terminal device in the first set, and the position is the first terminal device according to the preset The location determined by the algorithm in the first terminal device and the network device, so that when the first terminal device needs to retransmit data, the network device can determine the retransmission time of the first terminal device, and the system does not need to be the first terminal device. The retransmission of the reserved reference signal resources improves the resource utilization.

Optionally, before the first terminal device sends the first data to the network device in the retransmission time unit, the method 200 further includes:

S201. The first terminal device receives a negative acknowledgement (NACK) from the network device, where the NACK is used to indicate that decoding of second data fails, and the second data includes the first information block that has been processed The second symbol sequence obtained after.

S202, the first terminal device determines to retransmit the first information block according to the NACK.

In this application, the uplink message sent by the first terminal device to the network device includes at least one of the following information: a reference signal sequence, an identifier of the first terminal device, and user data, where, for example, the user data may be the first Data or second data, the format of the uplink message is shown in Figure 3, and the uplink message is sent in one uplink TTI. The uplink message shown in FIG. 3 is only an example, and the format of the uplink message applicable to this application may also be other formats. For example, the identifier of the first terminal device may be included in the user data, or identified by a specific reference signal sequence. The first terminal device.

In the uplink message shown in FIG. 3 , the reference signal is used for the network device to detect the user activity of the first terminal device and for the network device to perform channel estimation. If the network device detects the reference signal sent by the first terminal device, it means that the first terminal device is in the cell range covered by the network device and the first terminal device is sending data to the network device, that is, the first terminal device is in the user active state. The reference signal may be, for example, a preamble, a demodulation reference signal, or a random sequence. The user data may be, for example, a processed symbol sequence of the first information block.

The communication system predefines the time unit (for example, access time slot or access opportunity) that the terminal device can use to send the uplink message, and the predefined form is expressed as: specified in the communication protocol, or the network device determines the time unit and transmits it through the broadcast channel. Or system information is sent to the terminal device. When the terminal device is ready to send the uplink message, it randomly selects a reference signal to send the uplink message.

After the terminal device sends the uplink message on the selected time unit, the network device detects it on the time unit that may be selected by the terminal device. After the network device completes the user activity detection and channel estimation according to the reference signal, it further detects the user data and reports it to the terminal device. The device feeds back the receiving status of uplink messages. The results of the network device detecting the uplink message sent by the terminal device in a time unit are as follows:

First, the network device detects the reference signal sent by the terminal device and correctly detects the user data sent by the terminal device. The transmission situation of the terminal equipment corresponding to the detection result is that only one terminal equipment selects the reference signal.

Second, the network device detects the reference signal sent by the terminal device but fails to correctly detect the user data sent by the terminal device. The terminal equipment sending situation corresponding to the detection result is: only one terminal equipment selects the reference signal but the user data is not correctly detected due to poor channel quality, or at least two terminal equipments select the same reference signal and reach the network equipment. When the signal is in an enhanced state, the network device correctly detects that a terminal device sends the reference signal, but the user data of the at least two terminal devices is different, which causes the network device to fail to detect the user data.

Third, the network device detects that a terminal device has sent a reference signal in this time unit (for example, the correlation value between the received reference signal sequence and the sequence stored by the network device itself exceeds a predefined first threshold, or the received The energy value of the reference signal exceeds a predefined first threshold), but which reference signal is not correctly detected. The situation corresponding to the terminal equipment sending the detection result is that two or more terminal equipments select the same reference signal.

Fourth, the network device does not detect that any reference signal is sent in this time unit (for example, the correlation value between the received reference signal sequence and the sequence stored by the network device itself does not exceed a predefined second threshold, or the received The energy value of the reference signal does not exceed the predefined second threshold). Corresponding to the situation of the terminal equipment sending the detection result, none of the terminal equipment sends any reference signal.

The network device feeds back all the detection conditions in the time unit to the terminal device. The feedback message includes the detection result of each reference signal. The detection result for each reference signal can be fed back to the terminal device through two bits:

Case 1, the network device detects the reference signal sent by the terminal device and correctly detects the user data sent by the terminal device, and feeds back an acknowledgement (ACK);

Case 2, the network device detects the reference signal sent by the terminal device but fails to correctly detect the user data sent by the terminal device, and feeds back NACK;

In case 3, the network device detects that a terminal device has sent a reference signal in the time unit, but does not correctly detect which reference signal it is, and feeds back a collision (collision, C);

In case 4, the network device does not detect any reference signal in this time unit, and feeds back a blank (blank, B).

The feedback message sent by the network device to the terminal device includes detection results of all reference signals by the network device. The network device first tries to detect the reference signal that may be used by each terminal device. After the network device detects that a certain reference signal is used by the terminal device, the network device continues to detect the uplink message corresponding to the reference signal. Therefore, in this application, the network The detection result of the reference signal by the device includes the detection result of the uplink message corresponding to the reference signal by the network device. After the terminal device receives the feedback message, it needs to determine the detection result on the network device side of the uplink message sent by the terminal device. For example, the network device and the terminal device pre-agreed to rank all available reference signals, and the network device uses the ranking to feed back the detection result of each reference signal (for example, the detection result of each reference signal is represented by 2 bits). After receiving the feedback message, the terminal device determines the detection result of the reference signal from the feedback message according to the sequence number of the reference signal used by the terminal device itself to send the uplink message. The pre-agreed can be expressed as: stipulated in the communication protocol, or the network device determines the sequence and sends it to the terminal device through a broadcast channel or system information.

For example, the sequence of N available reference signals is: reference signal 1, reference signal 2, reference signal 3, ..., reference signal N. The feedback message sent by the network device to the terminal device includes: test result 1, test result 2, test result 3, ..., test result N. If the reference signal used by the terminal device to send the uplink message is the reference signal 3, after receiving the feedback message, the terminal device determines that the detection result of the uplink message by the network device is the detection result 3.

In S201, when the detection result received by the first terminal device is NACK, it is determined according to the NACK that the second data is not successfully transmitted. When the first terminal device determines to retransmit the first information block according to the NACK, it joins the first set, and determines the position of the first terminal device in the first set according to a preset algorithm, thereby determining the retransmission time unit, and in this The retransmission time unit sends retransmission data (first data) of the first information block to the network device. The above preset algorithm may be, for example, that the terminal device determines the position of the terminal device in the first set according to the sequence number of the reference signal used, the detection result of the reference signal fed back by the network device, and the position information of the first set. 4 to the method shown in Figure 9.

In this application, the second data may be initial transmission data of the first information block, or may be retransmission data of the first information block.

For the other three cases, when the detection result received by the first terminal device is ACK, the first terminal device determines that the second data is successfully transmitted, and the communication ends; when the detection result received by the first terminal device is C, the first terminal device The terminal device determines that the second data is not successfully transmitted, and the first terminal device may continue to queue to send the second data, or may not send the second data; when the detection result received by the first terminal device is B, the first terminal device determines that there is Available reference signals, when the first terminal device has data to send, it can select the available reference signals to send data at the next access opportunity.

Optionally, method 200 further includes:

S203: The first terminal device receives location information of a first set from the network device, where the location information is used to indicate the number of locations included in the first set, and the location information is used by the first terminal The device determines the location of the first terminal device in the first set.

The location information of the first set may be the number of locations included in the first set. The network device may also send location parameter information, and the first terminal device determines the number of locations included in the first set according to the location parameter information.

After receiving the data sent by at least one terminal device (including the first terminal device), the network device can determine the number of locations included in the first set according to the detection of the above-mentioned data, and send location information to the at least one terminal device. When the first terminal device receives the location information, it determines the location of the first terminal device in the first set according to the location information and the detection result of the reference signal fed back by the network device and the corresponding algorithm, so that it can be determined that the first terminal device sends Time unit of data.

FIG. 4 shows an exemplary flowchart of another data transmission method provided by the present application. For ease of understanding, a queue is used as an example for description.

In Figure 4, RA slot represents random access time slot, RA is the abbreviation of Random Access, each RA slot occupies limited resources, such as limited time-frequency resources, each solid line box represents a reference signal, the same as Three solid-line boxes in one RAslot represent three different reference signals, and the three reference signals may be mutually orthogonal reference signals.

d1 to d7 represent 7 terminal devices, the number in each solid line box represents the number of terminal devices using that reference signal, for example, in RA slot1, the number in the first solid line box is 4, indicating that The four terminal devices d1, d2, d3, and d4 use the reference signal corresponding to the solid line box.

The order of the terminal devices in the data contention transmission queue (DCTQ) may be, for example, sequentially arranged, that is, the terminal device at the head of the queue sends data first, and the terminal device at the end of the queue sends data last. The arrows on both sides of each DCTQ indicate the direction in which the terminal equipment joins the queue, that is, the terminal equipment newly joining the DCTQ is queued at the end of the queue.

In this application, the terminal device randomly selects a reference signal among the available reference signals, and the above-mentioned available reference signal may be specified by the protocol or indicated by the network device.

In RA slot1, after receiving the data sent by the seven terminal devices, the network device (not shown in FIG. 4 ) determines the feedback status information according to the data received. The reference signal corresponding to the first solid-line box (referred to as the The first reference signal) is used by four terminal devices. The network device cannot correctly demodulate the first reference signal. These four terminal devices are in a collision state. Therefore, the network device feeds back C; the reference corresponding to the second solid line box The signal (referred to as the second reference signal) is only used by d5, and the network device correctly receives the data sent by d5. Therefore, the network device feeds back a positive response A to d5; the reference signal corresponding to the third solid line box (referred to as the first Three reference signals) are used by two devices, the network device cannot correctly demodulate the third reference signal, that is, the two terminal devices are in a collision state, therefore, the network device feeds back C. The above feedback information is shown in the dotted box in FIG. 4 . The network device sends a feedback message after RA slot1, and the feedback message includes the above state information.

In this application, the terminal device collision or the data transmission collision sent by the terminal device refers to the failure of the network device to receive data due to the terminal device sending data on the same resource, and does not refer to the collision of physical entities.

It should also be understood that multiple terminal devices use the same resource to send data, which will cause the network device to fail to receive data. For ease of understanding, in this application, it is assumed that each terminal device uses the same frequency domain resources, and multiple terminal devices use the same reference. Signals sending data that the network device cannot properly demodulate to account for.

The network device determines that the length of the DCTQ is 2 according to the unsuccessful reception of data corresponding to the two reference signals (the first reference signal and the third reference signal) in the RA slot1 respectively, that is, the queue includes two positions.

After receiving the feedback message, the six terminal devices d1, d2, d3, d4, d6, and d7 determine to resend the data. According to the data corresponding to the two reference signals (the first reference signal and the third reference signal) in RA slot1, the The successful reception determines that the length of the DCTQ is 2, and the respective positions in the DCTQ are determined according to the serial numbers of the reference signals used by them. The sequence number 1 of d6 and d7 is ranked second according to the sequence number 3 of the third reference signal used and the uplink data corresponding to the second reference signal successfully received. The above example is only for illustration, and it is also possible that d6 and d7 are arranged in the first place and sent first, and d1, d2, d3, and d4 are arranged in the second place and sent later. Each time an RA slot passes, the length of the DCTQ is automatically decreased by 1, and the sequence number of the position of the terminal equipment in the DCTQ is also automatically decreased by 1. After each time slot, the network device determines the queue length of the next time slot according to the contention result of the time slot and the queue length of the previous time slot minus 1. For example, the DCTQ length fed back by the network device after RA slot1 is 2 (the first length). In RA slot2, the uplink data sent by d1, d2, and d3 is not successfully received. The network device determines to use the first reference signal according to the sequence number of the reference signal. The terminal equipment that uses the signal sends data first, and then the terminal equipment that uses the second reference signal sends data. That is, after RAslot2, two positions need to be allocated in the DCTQ for the terminal equipment that uses the first reference signal and the second reference signal. The above-mentioned first length Subtract 1 from RA slot2, and the result is 1 (this "1" means that the terminal device in DCTQ after RA slot1 needs one more transmission opportunity after RA slot2). The network device subtracts the above two positions and the first length according to The result obtained by removing 1 determines that the length of the DCTQ fed back after RA slot2 is 3. The terminal device can also determine the respective data sending sequence according to the above method, and determine the specific position in the DCTQ according to the length of the DCTQ fed back by the network device.

After receiving the feedback message, d5 determines not to join the DCTQ.

In RA slot2, d1, d2, d3, and d4 send data to the network device, and the network device sends a feedback message after RA slot2 according to the detection result of the data, wherein the network device successfully demodulates the reference signal sent by d1 and identifies d1, However, the user data sent by d1 was not successfully received. Therefore, the feedback message received by d1 is a negative response N; d2 and d3 use the same reference signal and are in a collision state. Therefore, the feedback message received by d2 and d3 is C; d4 The sent data is received correctly, therefore, the feedback message received by d4 is A.

After d1, d2, and d3 receive the feedback message, d1 determines to retransmit the data, d2 and d3 determine to retransmit the previously sent data, and d1 determines d1 according to the sequence number 1 of the first reference signal used by it. The terminal equipment with three reference signals (ie d2, d3, d4) sends data first, and determines that d1 is the second bit in the DCTQ after RA slot2 according to the value 1 (the value obtained by subtracting 1 from the queue length 2 after RA slot1). d2 and d3 determine that the respective data transmission order is located at the back of the terminal equipment (that is, d1) using the first reference signal according to the sequence number 2 of the second reference signal that it uses respectively, and according to the queue length 2 after the numerical value 1 (RA slot1) The value obtained by subtracting 1) determines that d2 and d3 are in the third bit in the DCTQ after RA slot2.

In RA slot3, it is the turn of d6 and d7 to send data. The data sent by d6 and d7 are all successfully received by the network device, and the feedback message received by d6 and d7 is A.

In RA slot4, it is d1's turn to send data, and the data sent by d1 in this time slot is retransmission data. Since the network device has recognized the identity of d1, and the DCTQ stored in the network device is the same as the DCTQ stored by each terminal device, the network device can determine the retransmission time unit of d1, so that the network device can send d1 to RA slot2. The data of d1 and the data sent in RAslot4 are combined and decoded, which increases the probability of successful d1 data transmission.

Optionally, when only one terminal device retransmits in an RA slot, the terminal device can select a fixed reference signal, and the network device also receives retransmission data according to the fixed reference signal, so that the network device can be reduced. Receive complexity.

In RA slot5, it is the turn of d2 and d3 to send data. The data sent by d2 and d3 are all successfully received by the network device, and the feedback message received by d2 and d3 is A. After that, the DCTQ queues in the network device and each terminal device are empty.

In this application, when the terminal device that has collided (ie, the terminal device that received the feedback message as C) transmits again, power ramping may be used to adjust the transmit power.

It should be understood that, for convenience of description, in this application, after an access slot refers to after the access slot and before the next access slot, for example, after RA slot1 refers to after RA slot1 and before RA slot2.

The above embodiment is a scheduling-free transmission scheme according to the data transmission method of the present application, and realizes automatic scheduling asynchronous retransmission. It is automatically realized, thereby improving the reliability of uplink data transmission. In addition, the network device and the terminal device each maintain only one queue, and the solution is simple and easy to implement.

The above embodiments are only examples, and the data transmission method provided by the present application is not limited thereto. The present application does not limit the sorting method of terminal devices in DCTQ in FIG. 4 . For example, the communication protocol may further stipulate that terminal devices with higher priority are arranged at the front of the queue and send data preferentially.

Optionally, the second terminal device is located in the same position in the first set as the first terminal device.

The second terminal device is any retransmission terminal device in the first set that is different from the first terminal device. After the terminal devices in the same access time slot compete for access, the feedback message received is a NACK terminal device It can be arranged in the same position in the queue according to a predetermined rule, and the network device also determines the position according to the predetermined rule, so that multiple terminal devices that may retransmit in different access time slots can retransmit in one access time slot. , improving resource utilization.

Optionally, method 200 further includes:

S204: The first terminal device determines, according to the resources used for initial transmission of the first information block, resources used for retransmission of the first information block.

In this application, multiple retransmitted terminal devices located at the same position in the queue may perform retransmission according to the resources used for initial transmission by the multiple retransmitted terminal devices, and the network device may perform initial transmission according to the multiple retransmitted terminal devices. The used resources are used to receive retransmission data, and the resources may be time-frequency resources, reference signals, or other resources, so that the receiving complexity of the network device can be reduced.

FIG. 5 shows an exemplary flowchart of still another data transmission method provided by the present application.

The meanings of the symbols and characters in FIG. 5 are the same as those shown in FIG. 4 . In addition, d1(1) indicates that d1 uses the first reference signal, and d4(3) indicates that d4 uses the third reference signal.

After RA slot2, according to the method shown in Figure 4 for the terminal equipment to determine its position in the queue, the DCTQ length fed back by the network equipment is 4, and the arrangement order of the terminal equipment in the DCTQ should be d6d7→d1→d2d3→d4, that is, d6 and d7 come first, and d4 comes last. According to the method shown in Figure 5 for the terminal device to determine its position in the queue, the DCTQ length fed back by the network device is 3, and the feedback messages received by d1 and d4 are N. Therefore, d1 and d4 can be ranked in the same position, for example , the order d6d7→d1(1)d4(3)→d2d3 as shown in Figure 5, d1 and d4 can also be arranged behind d2 and d3; the feedback message received by d2 and d3 is C, because d2 and d3 use The sequence number 2 of the second reference signal is greater than the sequence number 1 of the first reference signal used by d1. Therefore, d2 and d3 are arranged behind d1. Since the DCTQ length (first length) after RA slot1 is 2, the first length is in RA Subtracting 1 after slot2 results in 1 (that is, the position occupied by d6d7), so d2 and d3 rank third in the DCTQ. Therefore, according to the data transmission method shown in FIG. 5 , d1 and d4 can send retransmission data in the same time slot, which improves resource utilization.

d1 and d4 use the first reference signal and the third reference signal to send data in RA slot2 respectively, then d1 and d4 respectively record the reference signals used in RA slot2, and the network device also records the reference signals used by d1 and d4 in RA slot2, and In RA slot 4, the data sent by d1 is received according to the first reference signal, and the data sent by d4 is received according to the third reference signal, so that the receiving complexity of the network device can be reduced.

The above embodiments are only examples, and the present application is not limited thereto. For example, d1 and d4 may also determine the reference signal used for retransmission according to a predetermined rule.

Optionally, the first set is a set of terminal devices that send retransmission data.

The above embodiments are all in the case where the retransmission terminal equipment and the non-retransmission terminal equipment are located in the same queue. As an optional embodiment, the retransmission terminal equipment can be queued separately, that is, the first set is the terminals that send the retransmission data. Collection of equipment. Therefore, the communication system can uniformly manage the terminal equipment that sends the retransmitted data, for example, allocate resources to the terminal equipment that sends the retransmitted data, so as to improve the reliability of uplink data transmission.

Optionally, when the first set is a set of terminal devices that send retransmission data, the method 200 further includes:

S205, the first terminal device determines a retransmission time unit of the first information block according to the number of retransmission positions M and the position of the first terminal device in the first set, where M is used for Indicates that the terminal devices in the M locations in the first set send data in the retransmission time unit, where M is a positive integer.

The number of retransmission positions is used to indicate how many positions in the first set terminal equipment can send data in the next access time slot. For example, the current first set includes 6 positions, and the number of retransmission positions is 3, then the first set The terminal devices located in the first three positions can send data in the next access time slot, and the specific terminal devices in the positions can send data, which is not limited in this application.

The network device can determine the number of retransmission locations according to the available resources. If there are more resources available, the network device can set the number of retransmission locations to a larger value and send it to the terminal device; If the number of retransmission locations is less, the network device can set the number of retransmission locations to a smaller value and send it to the terminal device; or, the number of retransmission locations M is equal to the number K of resources available in the retransmission time unit by default. When the number of positions in the M is equal to or greater than K, then the next access slot is the retransmission time unit, and the terminal equipment corresponding to the M positions included in the first set sends retransmissions in the access slot The number of retransmission locations is equal to the number of resources available in the retransmission time unit by default, which means that the network device and the terminal devices in the first set can respectively determine that the number of retransmission locations is equal to The number of resources available in the retransmission time unit.

Therefore, the network device can flexibly determine the number of terminal devices that send retransmitted data within a time unit according to the actual situation, thereby improving resource utilization and reliability of uplink data transmission.

FIG. 6 shows a schematic flowchart of still another data transmission method provided by the present application.

In Figure 6, the terminal equipment in DCTQ is the terminal equipment that transmits non-retransmitted data, and the terminal equipment that transmits retransmission data is queued for transmission in the retransmission queue (RTQ). The symbols and characters shown in FIG. 5 have the same meaning.

In FIG. 6 , the terminal equipment in the collision state enters the DCTQ queuing transmission, and the terminal equipment in the retransmission state enters the RTQ queuing transmission. For DCTQ, after each access slot, the network device feeds back the contention result of each reference signal in the access slot and the length of the DCTQ. After each access slot, the length of the DCTQ is automatically reduced by 1, that is, the terminal The position of the device in the DCTQ moves forward by one, and the network device determines the new DCTQ length according to the contention result of the access slot and the DCTQ length of the previous access slot minus 1. If the terminal equipment in the DCTQ sends data in the previous access slot and the received feedback information is C, the terminal equipment re-queues in the DCTQ, for example, it can be queued at the end of the DCTQ; if the terminal equipment in the DCTQ If the data is sent in the previous access time slot and the received feedback information is N, the terminal device enters the RTQ queue, for example, it can be queued at the end of the RTQ queue.

The terminal device in RTQ starts to transmit data according to the predefined sending time unit or the default sending time unit. The number of transmission locations) determines the specific time unit for sending retransmission data. The predefined sending time unit refers to the time unit in which the terminal device sends data specified in the communication protocol or the time unit pre-determined by the network device and sent to the terminal device through a broadcast message or a system message. The default sending time unit refers to the time unit in which the terminal device sends data, which can be separately determined by the network device and the terminal device without information exchange. The time when the terminal device in RTQ sends data has nothing to do with the time when the terminal device in DCTQ sends data, and the two may be the same (as shown in FIG. 6 ) or different.

As shown in Figure 6, after RA slot1, the feedback message received by d5 is N, then d5 enters RTQ; after RA slot2, the feedback message received by d1 is N, d1 enters RTQ, and ranks after d5; After RA slot3, the feedback message received by d6 is N, and d6 enters RTQ and ranks after d1.

When the terminal equipment in RTQ starts to transmit data, there are three available reference signals after RA slot4, the network equipment can determine that the retransmission queue length is 3, then the top three terminal equipments in RTQ (ie, d5, d1 and d6) Data can be transmitted in RAslot5, and d3 waits for the next retransmission slot. After RA slot5, the feedback message received by d1 is N, then d1 enters the RTQ queue again, for example, d1 is queued at the end of the RTQ queue.

The above embodiments are only examples, and the data transmission method provided by the present application is not limited thereto. For example, in order to avoid collision of data transmitted in RA slot 5, the network device may set the retransmission queue length to 1.

Therefore, in the data transmission method provided by the present application, the terminal equipment that sends the retransmitted data is queued in a queue that only includes the terminal equipment that sends the retransmitted data, thereby helping the network equipment to uniformly manage the terminal equipment that sends the retransmitted data. In addition, The network device determines the length of the retransmission queue according to the available resources, which can improve resource utilization and reliability of uplink data transmission.

Optionally, method 200 further includes:

S206, when the number of times of transmission of the first information block satisfies the exit condition, the first terminal device exits the first set.

In S206, the number of transmissions may be the number of collisions, the number of retransmissions, or the sum of the number of retransmissions and the number of collisions.

In this application, when the feedback information received by the terminal device is NACK or C, it means that the data has not been transmitted successfully, and the terminal devices in the first set may still fail to transmit the data successfully after multiple transmissions. Influenced by other terminal devices in the set, a terminal device that fails to send data after multiple transmissions can exit the first set, that is, no longer compete for resources with other terminal devices in the first set. For example, the exit condition can be set as The transmission times threshold, when the collision times of the first information block (that is, the number of Cs received by the first terminal device) is greater than or equal to the transmission times threshold, the first terminal device exits the first set; or, when the first information block When the number of retransmissions is greater than or equal to the threshold of the number of transmissions, the first terminal device exits the first set; or, when the sum of the number of collisions of the first information block and the number of retransmissions is greater than or equal to the threshold of the number of transmissions, the first terminal device exits the first set. a collection.

The terminal equipment that exits the first set may try to compete for access again through resources corresponding to the first set after a preset period of time, or may try to compete for access again through resources other than resources corresponding to the first set.

FIG. 7 shows a schematic flowchart of still another data transmission method provided by the present application.

The meanings of the signs and characters in FIG. 7 are the same as those of the signs and characters shown in FIG. 4 , and the X-shaped sign indicates that the device exits the queue after the current access time slot. For example, the communication system sets the exit condition as the number of transmissions equal to 3. As shown in Figure 7, after d1 has experienced one collision and two retransmissions, the sum of the number of collisions and the number of retransmissions satisfies the exit condition. After RA slot4, Both d1 and the network device determine that d1 exits the DCTQ, and the length of the DCTQ returned by the network device is 1. At this time, d2 and d3 determine to send data in RA slot 5 according to the queue length of 1 respectively; the data sent by d2 and d3 collide in RA slot 5, If the number of collisions between the two satisfies the exit condition, after RA slot5, d2, d3 and the network device all determine that d2 and d3 exit the DCTQ, and the length of the DCTQ fed back by the network device is 0.

Therefore, in the data transmission method provided by the present application, the terminal device exits the queue when the number of transmissions of the terminal device meets the exit condition, thereby reducing the impact on other terminal devices in the queue and improving the reliability of uplink data transmission.

Optionally, method 200 further includes:

S230: The first terminal device receives first indication information from the network device, where the first indication information is used to indicate that the resources used by the first terminal device to send data are not occupied.

S240, the first terminal device exits the first set according to the first indication information.

Optionally, method 200 further includes:

S250: The first terminal device receives second indication information from the network device, where the second indication information is used to instruct the first terminal device to quit the first set.

S260, the first terminal device exits the first set according to the second indication information.

When the number of included positions in the queue is large (greater than or equal to 2), other terminal devices cannot determine which terminal devices have exited the queue, except that the terminal devices that meet the exit conditions can determine that they have exited the queue. May cause incorrect sorting results.

In order to avoid this situation, the present application proposes the following two solutions.

Option One

For the contention result on each contention resource, in addition to the above four kinds of feedback results, the network device can also feed back the state R (ie, the second indication information). The queued terminal equipment can determine the correct data transmission order according to R.

Option II

For the competition result on each competing resource, only four results of A, N, B, and C are still fed back. For the terminal device that needs to exit the queue, even if the terminal device uses the competing resource to send data, the result returned by the network device is B. (ie, the first indication information), the terminal device using the competing resource exits the queue, the terminal device sending data through the competing resource determines to exit the queue according to the feedback result B, and other terminal devices in the queue determine the correct data transmission order according to B .

FIG. 8 shows a schematic flowchart of still another data transmission method provided by the present application.

In Figure 8, the upper X-shaped mark indicates that d1 and d2 exit the DCTQ after the access time slot, the lower X-shaped mark indicates that the queue is an incorrect queue, and the meanings of the remaining marks and words are the same as those of the marks and words in Figure 4. Same meaning.

The communication system pre-specifies that the terminal equipment whose collision times reach two times exits the queue, d1 and d2 collide in RA slot1, and collide again in RA slot2, then d1 and d2 should exit DCTQ. The DCTQ queue length fed back by the network device is 3. For the contention results of d1 and d2, the network device can feed back R or B. Therefore, all terminal devices in the DCTQ determine to use the third reference signal to send data according to B or R. If the terminal equipment exits DCTQ, there will be no terminal equipment queued at the end of the DCTQ queue. After RA slot2, the correct sequence is d4d5→d6d7→d3 instead of d6d7→d3→d1d2. The wrong queue is marked with an X at the bottom of Figure 8. shown in the queue.

If the network device does not send B or R, but feeds back C on the result of the collision of d1 and d2 in RA slot2, and the feedback DCTQ length is 3, then except d1 and d2, other terminal devices cannot determine whether d1 and d2 will Continue queuing, resulting in incorrect queuing results.

Therefore, in the data transmission method provided by the present application, the first indication information or the second indication information is fed back to the terminal equipment that needs to exit the queue, so that the terminal equipment in the queue can be prevented from determining an incorrect data sending order.

FIG. 9 shows a schematic flow chart of still another data transmission method provided by the present application.

In Figure 9, the upper X-shaped mark indicates that d5 exits RTQ after the access time slot, the lower X-shaped mark indicates that the queue is an incorrect queue, and the meanings of the remaining marks and words are the same as those of the marks and words in Figure 5. .

The communication system pre-specifies that the terminal equipment whose transmission times reach twice exit the queue, d2 and d3 collide in RA slot1, and collide again in RA slot2, therefore, d2 and d3 exit the DCTQ. The network device feeds back that the DCTQ length is 1. Since there is only one position left in the DCTQ after RA slot2, d6 and d7 occupying this position will not make a wrong judgment.

For d5, since d5 is successfully transmitted in both RA slot1 and RA slot5, d5 needs to exit RTQ, the RTQ length fed back by the network device is 2, the network device can feed back the competition result of the first reference signal as R or B, d1 and d6 According to R or B, it is determined that the terminal equipment in RA slot 5 that uses the first reference signal to transmit data is no longer queued, so as to determine the correct RTQ.

If the queue length of the RTQ fed back by the network device after RA slot5 is 2, and the contention result of not feeding back the first reference signal is R or B, then d1 and d6 cannot determine the terminal device that uses the first reference signal to transmit data in RA slot5 Whether it will still be queued, which may lead to wrong queuing results, for d1, the possible wrong queuing results are RTQ marked by the X-shaped mark in Figure 9.

Therefore, in the data transmission method provided by the present application, the first indication information or the second indication information is fed back to the terminal equipment that needs to exit the queue, so that the terminal equipment in the queue can be prevented from determining an incorrect data sending order.

Optionally, before the first terminal device determines the retransmission time unit, the method 200 further includes:

S270. The first terminal device receives third indication information or fourth indication information from the network device, where the third indication information is used to instruct the second terminal device to exit the first set, and the fourth indication information It is used to indicate that the resource used by the second terminal device to send data is not used or the network device has not detected any terminal device on the resource used by the second terminal device to send data.

S280, the first terminal device determines the position of the first terminal device in the first set according to the third indication information or the fourth indication information.

In this application, when the second terminal device needs to exit the first set, for example, when the number of transmissions of the second terminal device satisfies the exit condition, the network device may send third indication information to the first terminal device and the second terminal device or fourth indication information, wherein the second terminal device is a terminal device in the first set whose transmission times satisfy the exit condition, and the first terminal device determines that the second terminal device exits the first set according to the third indication information or the fourth indication information , so that the first terminal device can correctly determine the position of the first terminal device in the first set.

As shown in Figure 9, the communication system pre-specifies that the terminal equipment whose transmission times reach twice exits the queue. In RAslot5, the transmission times of d5 reaches two times, and the transmission is still not successful. Therefore, d5 needs to exit RTQ, and the network equipment sends The terminal equipment in RTQ sends the third indication information or the fourth indication information. At this time, d5 is the second terminal equipment in S270 and S280, RTQ is the first set, d1 and d6 are the first terminal equipment, and d1 and d6 are respectively the first terminal equipment. According to the third indication information or the fourth indication information, it is determined that the terminal device using the first reference signal (ie, d5) exits the queue. Therefore, d1 determines that d1 is at the first position of RTQ according to the queue length 2 fed back by the network device, and d6 is based on the network device. The feedback queue length of 2 determines that d6 is in the second bit of RTQ.

FIG. 10 shows a schematic flowchart of still another data transmission method provided by the present application. The method 300 includes:

S310, the network device determines the retransmission time unit of the first terminal device.

S320: The network device detects, in the retransmission time unit, first data sent by the first terminal device, where the first data includes a first symbol sequence obtained after processing the first information block.

Wherein, the retransmission time unit is determined by the network device according to the sending sequence information of the first terminal device, and the sending sequence information of the first terminal device is determined by the network device based on the sending sequence information of the first terminal device The location in the first set is determined, and the location of the first terminal device in the first set is determined by the network device according to a preset algorithm.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, for the specific working process of the network device in the above-described method 300, reference may be made to the corresponding process of the network device in the foregoing method 200, which will not be repeated here.

Therefore, in the data transmission method provided by this application, the network device determines the retransmission time unit used by the first terminal device to send the retransmission data according to the location of the first terminal device in the first set, and the location is the network device according to the preset The position determined by the algorithm in the first terminal device and the network device, so that when the first terminal device needs to retransmit data, the network device can determine the retransmission time of the first terminal device, and the system does not need to Retransmission reserves reference signal resources, which improves resource utilization.

Optionally, before the network device detects the first data sent by the first terminal device in the retransmission time unit, the method 300 further includes:

S301, the network device sends a NACK to the first terminal device, where the NACK is used to indicate that the decoding of second data fails, and the second data includes a second symbol obtained after the first information block is processed sequence.

Thus, the first terminal device may determine that the second data is not successfully transmitted according to the NACK sent by the network device, and determine to retransmit the information block (ie, the first information block) corresponding to the second data according to the NACK.

Optionally, method 300 further includes:

S302: The network device sends location information of the first set to the first terminal device, where the location information is used to indicate the number of locations included in the first set, so that the first terminal device can The location information determines the location of the first terminal device in the first set.

After receiving the data sent by at least one terminal device (including the first terminal device), the network device can determine the number of locations included in the first set according to the detection of the uplink data, and send location information to the at least one terminal device. When the terminal device receives the location information, it determines the location of the terminal device in the first set according to the location information and a corresponding algorithm, so that the time unit in which the terminal device sends data can be determined.

Optionally, the second terminal device is located in the same position in the first set as the first terminal device.

The second terminal device is any retransmission terminal device in the first set that is different from the first terminal device. After the terminal devices in the same access time slot compete for access, the feedback message received is a NACK terminal device It can be arranged in the same position in the queue according to a predetermined rule, and the network device also determines the position according to the predetermined rule, so that multiple terminal devices that may retransmit in different access time slots can retransmit in one access time slot. , improving resource utilization.

Optionally, method 300 further includes:

S303: The network device determines, according to the resources used for initial transmission of the first information block, resources used for retransmission of the first information block.

In this application, multiple retransmitted terminal devices located at the same position in the queue may perform retransmission according to the resources used for initial transmission by the multiple retransmitted terminal devices, and the network device may perform initial transmission according to the multiple retransmitted terminal devices. The used resources (excluding time domain resources) receive retransmission data, and the resources may be frequency domain resources, reference signals, or other resources, so that the receiving complexity of the network device can be reduced.

Optionally, the first set is a set of terminal devices that send retransmission data.

Retransmission terminal devices may be queued individually, that is, the first set is the set of terminal devices that transmit retransmission data. Therefore, the communication system can uniformly manage the terminal equipment that sends the retransmitted data, for example, allocate resources to the terminal equipment that sends the retransmitted data, so as to improve the reliability of uplink data transmission.

Optionally, method 300 further includes:

S304, the network device determines the retransmission time unit of the first information block according to the number of retransmission positions M and the position of the first terminal device in the first set, where M is used to indicate the The terminal devices at M locations in the first set send data in the retransmission time unit, where M is a positive integer.

The network device can determine the number of retransmission locations according to the available resources. If there are more resources available, the network device can set the number of retransmission locations to a larger value and send it to the terminal device; If the number of retransmission locations is less, the network device can set the number of retransmission locations to a smaller value and send it to the terminal device; or, the number of retransmission locations M is equal to the number K of resources available in the retransmission time unit by default. When the number of positions in the M is equal to or greater than K, then the next access slot is the retransmission time unit, and the terminal equipment corresponding to the M positions included in the first set sends retransmissions in the access slot The number of retransmission locations is equal to the number of resources available in the retransmission time unit by default, which means that the network device and the terminal devices in the first set can respectively determine that the number of retransmission locations is equal to The number of resources available in the retransmission time unit.

Therefore, the network device can flexibly determine the data of the terminal device that sends the retransmitted data within a time unit according to the actual situation, which improves the resource utilization rate and the reliability of uplink data transmission.

Optionally, method 300 further includes:

S305, when the number of times of transmission of the first information block satisfies the exit condition, the network device determines that the first terminal device exits the first set.

In S305, the number of transmissions may be the number of collisions, the number of retransmissions, or the sum of the number of retransmissions and the number of collisions.

In this application, when the feedback information received by the terminal device is NACK or C, it means that the data has not been transmitted successfully, and the terminal devices in the first set may still fail to transmit the data successfully after multiple transmissions. Influenced by other terminal devices in the set, a terminal device that fails to send data after multiple transmissions can exit the first set, that is, it will no longer compete for resources with other terminal devices in the first set, so that the data of other terminal devices can be improved. The probability of a successful transmission.

Optionally, method 300 further includes:

S306, the network device sends first indication information, where the first indication information is used to indicate that the resources used by the first terminal device to send data are not used or the network device does not send data on the first terminal device Any end device detected on the resource used.

When the number of included positions in the queue is large (greater than or equal to 2), other terminal devices cannot determine which terminal devices have exited the queue, except that the terminal devices that meet the exit conditions can determine that they have exited the queue. May cause incorrect sorting results.

In the data transmission method provided by the present application, the first indication information is fed back to the terminal equipment that needs to exit the queue, so that the terminal equipment in the queue can be prevented from determining an incorrect data sending sequence.

Optionally, method 300 further includes:

S307: The network device sends second indication information, where the second indication information is used to instruct the first terminal device to quit the first set.

When the number of included positions in the queue is large (greater than or equal to 2), other terminal devices cannot determine which terminal devices have exited the queue, except that the terminal devices that meet the exit conditions can determine that they have exited the queue. May cause incorrect sorting results.

In the data transmission method provided by the present application, the second indication information is fed back to the terminal device that needs to exit the queue, so that the terminal device in the queue can be prevented from determining an incorrect data sending sequence.

The method examples of data transmission provided by the present application are described in detail above. It can be understood that, in order to implement the above-mentioned functions, the terminal device and the network device include corresponding hardware structures and/or software modules for executing each function. Those skilled in the art should easily realize that the present application can be implemented in hardware or a combination of hardware and computer software with the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein. Whether a function is performed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

The present application may divide the functional units of the terminal device and the like according to the above method examples. For example, each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one processing unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units. It should be noted that the division of units in this application is schematic, and is only a logical function division, and other division methods may be used in actual implementation.

In the case of using an integrated unit, FIG. 11 shows a possible schematic structural diagram of the first terminal device involved in the above embodiment. The first terminal device 1100 includes: a processing unit 1102 and a communication unit 1103 . The processing unit 1102 is configured to control and manage the actions of the first terminal device 1100 , for example, the processing unit 1102 is configured to support the first terminal device 1100 to perform S210 of FIG. 2 and/or other processes for the techniques described herein. The communication unit 1103 is used to support the communication between the first terminal device 1100 and other network entities, for example, the communication with the network device. The first terminal device 1100 may further include a storage unit 1101 for storing program codes and data of the first terminal device 1100 .

The processing unit 1102 may be a processor or a controller, such as a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), or an application-specific integrated circuit (application-specific integrated circuit). circuit, ASIC), field programmable gate array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute the various exemplary logical blocks, modules and circuits described in connection with this disclosure. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like. The communication unit 1103 may be a transceiver, a transceiver circuit, or the like. The storage unit 1101 may be a memory.

The first terminal device 1100 provided by this application determines a retransmission time unit for sending retransmission data according to the position of the first terminal device 1100 in the first set, where the The position determined by the algorithm in the terminal device 1100 and the network device, so that when the first terminal device 1100 needs to retransmit data, the network device can determine the retransmission time of the first terminal device 1100, and the system does not need to be the first terminal device 1100. The retransmission of the reserved reference signal resources improves the resource utilization.

When the processing unit 1102 is a processor, the communication unit 1103 is a transceiver, and the storage unit 1101 is a memory, the first terminal device involved in this application may be the first terminal device shown in FIG. 12 .

Referring to FIG. 12 , the first terminal device 1200 includes: a processor 1202 , a transceiver 1203 , and a memory 1201 . The transceiver 1203, the processor 1202, and the memory 1201 can communicate with each other through an internal connection path to transmit control and/or data signals.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, for the specific working process of the above-described devices and units, reference may be made to the corresponding processes in the foregoing method embodiments, and details are not repeated here.

The first terminal device 1200 provided in this application determines a retransmission time unit for sending retransmission data according to the position of the first terminal device 1200 in the first set, where the The position determined by the algorithm in the terminal device 1200 and the network device, so that when the first terminal device 1200 needs to retransmit data, the network device can determine the retransmission time of the first terminal device 1200, and the system does not need to be the first terminal device 1200. The retransmission of the reserved reference signal resources improves the resource utilization.

In the case of using an integrated unit, FIG. 13 shows a possible schematic structural diagram of the network device involved in the above embodiment. The network device 1300 includes: a processing unit 1302 and a communication unit 1303 . The processing unit 1302 is used to control and manage the actions of the network device 1300, eg, the processing unit 1302 is used to support the network device 1300 to perform S310 of FIG. 10 and/or other processes for the techniques described herein. The communication unit 1303 is used to support the communication between the network device 1300 and other network entities, such as communication with the terminal device. The network device 1300 may further include a storage unit 1301 for storing program codes and data of the network device 1300 .

The processing unit 1302 may be a processor or a controller, for example, a CPU, a general-purpose processor, a DSP, an ASIC, an FPGA, or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute the various exemplary logical blocks, modules and circuits described in connection with this disclosure. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like. The communication unit 1303 may be a transceiver, a transceiver circuit, or the like. The storage unit 1301 may be a memory.

The network device 1300 for data transmission provided by the present application determines the retransmission time unit used by the first terminal device to send the retransmission data according to the location of the first terminal device in the first set, where the location is the network device 1300 according to the preset The position determined by the algorithms in the first terminal device and the network device 1300, so that when the first terminal device needs to retransmit data, the network device 1300 can determine the retransmission time of the first terminal device, and the system does not need to provide the first terminal device The retransmission of the reserved reference signal resources improves the resource utilization.

When the processing unit 1302 is a processor, the communication unit 1303 is a transceiver, and the storage unit 1301 is a memory, the network device involved in this application may be the network device shown in FIG. 14 .

Referring to FIG. 14 , the network device 1400 includes: a processor 1402 , a transceiver 1403 , and a memory 1401 . The transceiver 1403, the processor 1402 and the memory 1401 can communicate with each other through an internal connection path to transmit control and/or data signals.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, for the specific working process of the above-described devices and units, reference may be made to the corresponding processes in the foregoing method embodiments, and details are not repeated here.

The network device 1400 for data transmission provided by this application determines the retransmission time unit used by the first terminal device to send the retransmission data according to the location of the first terminal device in the first set, where the location is the network device 1400 according to the preset The position determined by the algorithms in the first terminal device and the network device 1400, so that when the first terminal device needs to retransmit data, the network device 1400 can determine the retransmission time of the first terminal device, and the system does not need to provide the first terminal device The retransmission of the reserved reference signal resources improves the resource utilization.

In each embodiment of the present application, the size of the sequence number of each process does not mean the sequence of execution, and the execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the present application.

In addition, the term "and/or" in this article is only an association relationship to describe the associated objects, indicating that there can be three kinds of relationships, for example, A and/or B, it can mean that A exists alone, A and B exist at the same time, There are three cases of B alone. In addition, the character "/" in this document generally indicates that the related objects are an "or" relationship.

The steps of the methods or algorithms described in conjunction with the disclosure of the present application may be implemented in a hardware manner, or may be implemented in a manner in which a processor executes software instructions. Software instructions can be composed of corresponding software modules, and software modules can be stored in random access memory (RAM), flash memory, read only memory (ROM), erasable programmable read only memory (erasable). programmable ROM, EPROM), electrically erasable programmable read-only memory (electrically EPROM, EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor, such that the processor can read information from, and write information to, the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and storage medium may reside in an ASIC. Alternatively, the ASIC may be located in the end device. Of course, the processor and the storage medium may also exist in the terminal device and the network device as discrete components.

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented in software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The computer program instructions, when loaded and executed on a computer, result in whole or in part of the processes or functions described herein. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored in or transmitted over a computer-readable storage medium. The computer instructions can be sent from one website site, computer, server, or data center to another website site by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.) , computer, server or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes an integration of one or more available media. The usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVDs), or semiconductor media (eg, solid state disks (SSDs)), and the like.

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above descriptions are only specific embodiments of the present application, and are not intended to limit the The protection scope, any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the present application shall be included within the protection scope of the present application.

Claims (42)

1. A method of data transmission, the method comprising:

the first terminal equipment determines a retransmission time unit of the first information block;

the first terminal device sends first data to a network device in the retransmission time unit, wherein the first data comprises a first symbol sequence obtained after the first information block is processed;

the retransmission time unit is determined by the first terminal device according to the transmission sequence information of the first terminal device, the transmission sequence information of the first terminal device is determined by the first terminal device based on the position of the first terminal device in the first set, and the position of the first terminal device in the first set is determined by the first terminal device according to a preset algorithm.

2. The method of claim 1, wherein the first terminal device sends the first data to the network device in the retransmission time unit, and wherein the method further comprises:

the first terminal equipment receives a Negative Acknowledgement (NACK) from the network equipment, wherein the NACK is used for indicating that decoding of second data fails, and the second data comprises a second symbol sequence obtained after the first information block is processed;

and the first terminal equipment determines to retransmit the first information block according to the NACK.

3. The method according to claim 1 or 2, characterized in that the method further comprises:

the first terminal device receives a first set of location information from the network device, the location information indicating a number of locations included in the first set, the location information being used by the first terminal device to determine a location of the first terminal device in the first set.

4. The method according to claim 1 or 2, characterized in that a second terminal device is located at the same position in the first set as the first terminal device.

5. The method according to claim 1 or 2, characterized in that the method further comprises:

and the first terminal equipment determines the resource used by the retransmission of the first information block according to the resource used by the initial transmission of the first information block.

6. The method according to claim 1 or 2, wherein the first set is a set of terminal devices that send retransmission data.

7. The method of claim 6, further comprising:

and the first terminal equipment determines a retransmission time unit of the first information block according to the number M of retransmission positions and the positions of the first terminal equipment in the first set, wherein M is used for indicating the terminal equipment at M positions in the first set to send data in the retransmission time unit, and M is a positive integer.

8. The method according to claim 1 or 2, characterized in that the method further comprises:

and when the transmission times of the first information block meet an exit condition, the first terminal equipment exits the first set.

9. The method according to claim 1 or 2, characterized in that the method further comprises:

the first terminal device receives first indication information from a network device, wherein the first indication information is used for indicating that a resource used by the first terminal device for sending data is not used or the network device does not detect any terminal device on the resource used by the first terminal device for sending data;

and the first terminal equipment exits the first set according to the first indication information.

10. The method according to claim 1 or 2, characterized in that the method further comprises:

the first terminal device receives second indication information from a network device, wherein the second indication information is used for indicating that the first terminal device exits the first set;

and the first terminal equipment exits the first set according to the second indication information.

11. The method according to claim 1 or 2, wherein the first terminal device determines the retransmission time unit before, the method further comprising:

the first terminal device receives third indication information or fourth indication information from the network device, wherein the third indication information is used for indicating that a second terminal device exits the first set, and the fourth indication information is used for indicating that a resource used by the second terminal device for sending data is not used or the network device does not detect any terminal device on the resource used by the second terminal device for sending data;

and the first terminal equipment determines the position of the first terminal equipment in the first set according to the third indication information or the fourth indication information.

12. A method of data transmission, the method comprising:

the network equipment determines a retransmission time unit of the first terminal equipment;

the network device detects first data sent by the first terminal device in the retransmission time unit, wherein the first data comprises a first symbol sequence obtained after a first information block is processed;

the network device determines the retransmission time unit according to the transmission sequence information of the first terminal device, the transmission sequence information of the first terminal device is determined by the network device based on the position of the first terminal device in the first set, and the position of the first terminal device in the first set is determined by the network device according to a preset algorithm.

13. The method of claim 12, wherein before the network device detects the first data transmitted by the first terminal device in the retransmission time unit, the method further comprises:

and the network equipment sends a Negative Acknowledgement (NACK) to the first terminal equipment, wherein the NACK is used for indicating that decoding of second data fails, and the second data comprises a second symbol sequence obtained after the first information block is processed.

14. The method according to claim 12 or 13, characterized in that the method further comprises:

the network device sends location information of a first set to the first terminal device, wherein the location information is used for indicating the number of locations included in the first set, so that the first terminal device can determine the location of the first terminal device in the first set according to the location information.

15. Method according to claim 12 or 13, wherein a second terminal device is located at the same position in the first set as the first terminal device.

16. The method according to claim 12 or 13, characterized in that the method further comprises:

and the network equipment determines the resources used by the retransmission of the first information block according to the resources used by the initial transmission of the first information block.

17. The method according to claim 12 or 13, wherein the first set is a set of terminal devices that transmit retransmission data.

18. The method of claim 17, further comprising:

the network device determines a retransmission time unit of the first information block according to the number M of retransmission positions and the position of the first terminal device in the first set, wherein M is used for indicating the terminal devices at M positions in the first set to transmit data in the retransmission time unit, and M is a positive integer.

19. The method according to claim 12 or 13, characterized in that the method further comprises:

and when the transmission times of the first information block meet an exit condition, the network equipment determines that the first terminal equipment exits the first set.

20. The method of claim 19, further comprising:

the network equipment sends first indication information, wherein the first indication information is used for indicating that a resource used by the first terminal equipment for sending data is not used or the network equipment does not detect any terminal equipment on the resource used by the first terminal equipment for sending data.

21. The method of claim 19, further comprising:

and the network equipment sends second indication information, wherein the second indication information is used for indicating the first terminal equipment to exit the first set.

22. An apparatus for data transmission, the apparatus comprising a communication unit and a processing unit,

the processing unit is configured to: determining a retransmission time unit of the first information block;

the communication unit is configured to: sending first data to a network device in the retransmission time unit determined by the processing unit, where the first data includes a first symbol sequence obtained after the first information block is processed;

wherein the retransmission time unit is determined by the processing unit according to transmission order information of the apparatus, the transmission order information of the apparatus is determined by the processing unit based on a position of the apparatus in a first set, and the position of the apparatus in the first set is determined by the processing unit according to a preset algorithm.

23. The apparatus of claim 22,

the communication unit is further configured to: receiving a Negative Acknowledgement (NACK) from the network device, wherein the NACK is used for indicating that decoding of second data fails, and the second data comprises a second symbol sequence obtained after the first information block is processed;

the processing unit is further to: and determining to retransmit the first information block according to the NACK.

24. The apparatus of claim 22 or 23,

the communication unit is further configured to: receiving, from the network device, a first set of location information indicating a number of locations included in the first set, the location information being used by the processing unit to determine a location of the apparatus in the first set.

25. The apparatus according to claim 22 or 23, wherein the second terminal device is located at the same position in the first set as the apparatus.

26. The apparatus according to claim 22 or 23, wherein the processing unit is further configured to:

and determining the resource used by the retransmission of the first information block according to the resource used by the initial transmission of the first information block.

27. The apparatus according to claim 22 or 23, wherein the first set is a set of terminal devices that transmit retransmission data.

28. The apparatus of claim 27, wherein the processing unit is further configured to:

and determining a retransmission time unit of the first information block according to the number M of retransmission positions and the position of the device in the first set, wherein M is used for indicating terminal equipment at M positions in the first set to transmit data in the retransmission time unit, and M is a positive integer.

29. The apparatus according to claim 22 or 23, wherein the processing unit is further configured to:

determining that the apparatus exits the first set when the number of transmissions of the first information block satisfies an exit condition.

30. The apparatus of claim 22 or 23,

the communication unit is further configured to: receiving first indication information from a network device, wherein the first indication information is used for indicating that a resource used by the device for sending data is not used or the network device does not detect any terminal device on the resource used by the device for sending data;

the processing unit is specifically configured to: determining that the apparatus exits the first set according to the first indication information.

31. The apparatus of claim 22 or 23,

the communication unit is further configured to: receiving second indication information from a network device, the second indication information indicating that the apparatus exits the first set;

the processing unit is further to: determining that the apparatus exits the first set according to the second indication information.

32. The apparatus of claim 22 or 23,

the communication unit is further configured to: receiving third indication information or fourth indication information from the network device, wherein the third indication information is used for indicating that a second terminal device exits the first set, and the fourth indication information is used for indicating that a resource used by the second terminal device for sending data is not used or the network device does not detect any terminal device on the resource used by the second terminal device for sending data;

the processing unit is further to: determining a location of the apparatus in the first set according to the third indication information or the fourth indication information.

33. An apparatus for data transmission, the apparatus comprising a communication unit and a processing unit,

the processing unit is configured to: determining a retransmission time unit of the first terminal equipment;

the communication unit is configured to: detecting first data sent by the first terminal device in the retransmission time unit determined by the processing unit, wherein the first data comprises a first symbol sequence obtained after a first information block is processed;

wherein the retransmission time unit is determined by the processing unit according to the transmission sequence information of the first terminal device, the transmission sequence information of the first terminal device is determined by the processing unit based on the position of the first terminal device in the first set, and the position of the first terminal device in the first set is determined by the processing unit according to a preset algorithm.

34. The apparatus of claim 33, wherein the communication unit is further configured to:

and sending a Negative Acknowledgement (NACK) to the first terminal device, wherein the NACK is used for indicating that decoding of second data fails, and the second data comprises a second symbol sequence obtained after the first information block is processed.

35. The apparatus of claim 33 or 34, wherein the communication unit is further configured to:

and sending position information of a first set to the first terminal equipment, wherein the position information is used for indicating the number of positions included in the first set, so that the first terminal equipment can determine the position of the first terminal equipment in the first set according to the position information.

36. The apparatus according to claim 33 or 34, wherein the second terminal device is located at the same position in the first set as the first terminal device.

37. The apparatus according to claim 33 or 34, wherein the processing unit is further configured to:

and determining the resource used by the retransmission of the first information block according to the resource used by the initial transmission of the first information block.

38. The apparatus according to claim 33 or 34, wherein the first set is a set of terminal devices that transmit retransmission data.

39. The apparatus of claim 38, wherein the processing unit is further configured to:

and determining a retransmission time unit of the first information block according to the number M of retransmission positions and the positions of the first terminal equipment in the first set, wherein M is used for indicating the terminal equipment at M positions in the first set to send data in the retransmission time unit, and M is a positive integer.

40. The apparatus according to claim 33 or 34, wherein the processing unit is further configured to:

and when the transmission times of the first information block meet an exit condition, determining that the first terminal equipment exits the first set.

41. The apparatus of claim 40, wherein the communication unit is further configured to:

and sending first indication information, wherein the first indication information is used for indicating that the resource used by the first terminal equipment for sending data is not used or the device does not detect any terminal equipment on the resource used by the first terminal equipment for sending data.

42. The apparatus of claim 40, wherein the communication unit is further configured to:

and sending second indication information, wherein the second indication information is used for indicating the first terminal equipment to exit the first set.

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