WO2018137621A1 - 一种数据重传方法、通信装置 - Google Patents

一种数据重传方法、通信装置 Download PDF

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Publication number
WO2018137621A1
WO2018137621A1 PCT/CN2018/073855 CN2018073855W WO2018137621A1 WO 2018137621 A1 WO2018137621 A1 WO 2018137621A1 CN 2018073855 W CN2018073855 W CN 2018073855W WO 2018137621 A1 WO2018137621 A1 WO 2018137621A1
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Prior art keywords
data
transmission
delay
timer
retransmission
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PCT/CN2018/073855
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English (en)
French (fr)
Inventor
徐修强
吴艺群
陈雁
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华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP18743951.8A priority Critical patent/EP3550754B1/en
Publication of WO2018137621A1 publication Critical patent/WO2018137621A1/zh
Priority to US16/523,941 priority patent/US11082166B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/188—Time-out mechanisms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements

Definitions

  • the present application relates to the field of wireless communication technologies, and in particular, to a data retransmission method and a communication device.
  • Ultra-Reliability Low-Latency Communication is an important scenario in the future communication network.
  • the typical characteristics of this scenario are high reliability (for example, 99.999% reliability) and transmission. Delayed (for example, the delay for some services is less than 1ms).
  • Data retransmission such as Hybrid Auto ReQuest (HARQ)
  • HARQ Hybrid Auto ReQuest
  • communication in the URLLC scenario is likely to introduce retransmission technology to meet reliability requirements, including feedback.
  • Retransmission technology and retransmission technology that is not based on feedback.
  • the feedback-based retransmission technique is that after the transmitting end sends the data, it waits for the receiving end to feedback the reception of the data. If the transmitting end receives the negative feedback of the receiving end, such as NACK (Negative ACKnowledgment), or the transmitting end does not receive the receiving end. Forward feedback, such as ACK (ACKnowledge), the sender retransmits the data, and the retransmission can be a complete replication of the previous transmission, or a different redundancy version.
  • NACK Negative ACKnowledgment
  • the retransmission technology that is not based on feedback, that is, after the transmitting end sends data, it does not have to wait for the receiving end to feedback the reception of the data, and directly retransmits the data in subsequent possible transmission occasions, such as time slots, subframes, etc.
  • the transmission can be a full copy of the previous transmission or a different redundancy version.
  • retransmission will inevitably increase the delay. Therefore, in order to meet the requirement of low delay at the same time, retransmission cannot be performed without limitation, and a certain number of retransmissions need to be performed under the premise of delay permission.
  • the transmitting end only judges the number of retransmissions before performing retransmission. If the maximum number of retransmissions is not reached, the retransmission is performed, otherwise retransmission is not performed.
  • the inventors have found that the retransmission mode in the prior art easily leads to outdated data and redundant transmission, which has a negative impact on the communication system and cannot meet the requirement of delay.
  • the present application describes a data retransmission method, communication device and system.
  • the present application provides a data retransmission method for the problem that the expired data and the redundant transmission are easily generated when data is retransmitted in the prior art.
  • the embodiment of the present application provides a technical solution for performing delay determination when transmitting data, that is, the sending end starts a timer before sending the data, and the sending end starts timing when acquiring new data to be sent. Start the timer when new data arrives at the sender. After the sender starts the timer, it determines whether the timer has remaining time before sending data (including the first transmission and retransmission) or before sending the retransmission data. If there is no remaining time or the remaining time is not enough, the data transmission time , then stop sending data.
  • the maximum transmission delay of the data transmission type is different, so the maximum transmission delay is determined based on the maximum transmission delay in the embodiment of the present application, and the maximum transmission is obtained after the sender acquires new data.
  • the number of times for the first transmission and retransmission, rather than retransmission based on the maximum number of retransmissions specified by the system.
  • the transmitting end determines the maximum number of transmissions of the new data to be sent, and the maximum number of transmissions is determined according to the maximum transmission delay and the single transmission delay; the maximum transmission delay is determined by the service type corresponding to the data;
  • the transmitting end sends retransmission data based on the maximum number of transmissions when the data needs to be retransmitted, and the retransmission data is part or all of the data.
  • the maximum number of transmissions includes the number of retransmissions of transmitting the new data for the first time and transmitting the retransmitted data.
  • the sending end determines the maximum number of transmissions of the transmitted data, including:
  • the transmitting end determines the maximum number of transmissions of the transmission data according to the system configuration and the maximum transmission delay and the single transmission delay; or
  • the sending end determines the maximum number of transmissions from the indication message from the receiving end; the maximum number of transmissions is determined by the receiving end according to a system configuration and the maximum transmission delay and a single transmission delay.
  • the system configuration indicates whether the configured transmission resource is continuous or non-contiguous, or indicates a value of a time interval between the configured transmission resources, for example, a value of T_Gap.
  • the sending end transmits the data to the receiving end according to the maximum number of transmissions, including:
  • the sending end starts a timer before sending the data, and the preset value of the timer is the maximum transmission delay corresponding to the service type of the data;
  • the sending end sends the data once to the receiving end (including the first transmission data), and the maximum number of transmissions is reduced by one;
  • the transmitting end stops transmitting retransmission data to the receiving end.
  • the sending end starts a timer before sending the data, and the sending end starts a timer when acquiring new data to be sent, or starts a timer when new data arrives at the sending end.
  • the sending end transmits the data to the receiving end according to the maximum number of transmissions, including:
  • the sending end starts a timer before sending the data, and the preset value of the timer is the maximum transmission delay corresponding to the service type of the data;
  • the sending end sends the data once to the receiving end (including the first transmission data), and the maximum number of transmissions is reduced by one;
  • the sending end stops The receiving end sends retransmission data.
  • the sending end transmits the data to the receiving end according to the maximum number of transmissions, including:
  • the sending end starts a timer before sending the data, and the preset value of the timer is the maximum transmission delay corresponding to the service type of the data;
  • the sending end sends the data once to the receiving end (including the first transmission data), and the maximum number of transmissions is reduced by one;
  • the transmitting end Send retransmission data to the receiving end.
  • the maximum transmission number is calculated as follows:
  • N_MAX Floor(Total_Delay_MAX/Single_Tx_Delay);
  • Total_Delay_MAX is the maximum transmission delay corresponding to the service type of the data
  • Single_Tx_Delay is a single transmission delay corresponding to the type of data of the data.
  • N_MAX Floor((Total_Delay_MAX-Delta_T)/Single_Tx_Delay);
  • Total_Delay_MAX is the maximum transmission delay corresponding to the service type of the data
  • Delta_T is the delay of requesting scheduling resources
  • Single_Tx_Delay is a single transmission delay corresponding to the type of data of the data.
  • T_Gap ⁇ 0ms is the time interval between two adjacent transmission resources for transmitting uplink data
  • T_Tx>0ms is the delay required for the transmitting end to process data
  • T_Rx>0ms is the receiving end processing the received data.
  • the required delay; T_Rx>0ms indicates the delay required for the air interface to transmit data; T_Bu>0ms indicates the delay required for the data of the sender to wait for transmission in the buffer.
  • T_Gap_SR ⁇ 0ms is the time interval between two adjacent transmission resources for sending a scheduling request
  • T_AI_SR 0ms, which is the delay required for the sender to send a scheduling request on the air interface
  • T_Gap_SR_D ⁇ 0 ms which is the time interval between the transmission of the transmission request to the transmitting end and the transmission of the transmission data allocated by the receiving end to the receiving end.
  • the data retransmission method provided in this embodiment can avoid redundant transmission caused by retransmission of all service-related data by the same number of times by setting a maximum transmission delay, and reduce information interaction between the sender and the sender. Therefore, the processing complexity of the retransmission is reduced, and the retransmission feedback time is reduced.
  • the present application also provides a plurality of methods for calculating the single transmission delay, so that the maximum number of transmissions in different scenarios can be accurately calculated, so that the technical solution of the present application can satisfy different scenarios. Requires and satisfies the requirements of the URLLC.
  • the embodiment of the present application provides a communication device, which may be a network side device or a terminal.
  • the network side device may be a base station or a control node.
  • the terminal When the network side device is used as the data transmitting end, the terminal serves as the data receiving end; when the terminal serves as the data transmitting end, the network side device serves as the data receiving end.
  • the communication device as a data sending end, includes:
  • a transceiver configured to transmit the data to the receiving end after the processor starts a timer
  • the processor is further configured to determine whether the timer expires, and when the timer does not time out, the transceiver sends retransmission data to the receiving end when data needs to be retransmitted; the retransmission The data is part or all of the data; in the event that the timer expires, the transceiver stops transmitting the retransmitted data to the receiving end.
  • the communication device provided in the embodiment of the present application avoids the problem that the maximum transmission delay is exhausted, but the maximum transmission delay is exhausted, and the transmitting end is still transmitting data, so that the receiving end receives the expired data. It can avoid redundant transmission and save transmission resources.
  • the communications device as a data sending end, includes:
  • a processor configured to determine a maximum number of transmissions of new data to be sent, where the maximum number of transmissions is determined according to a maximum transmission delay and a single transmission delay; the maximum transmission delay is determined by a service type corresponding to the data ;
  • a transceiver configured to send retransmission data based on the maximum number of transmissions when the data needs to be retransmitted, where the retransmission data is part or all of the data.
  • the maximum number of transmissions includes the number of retransmissions of transmitting the new data for the first time and transmitting the retransmitted data.
  • the processor is specifically configured to determine, according to a system configuration, the maximum transmission delay and a single transmission delay, a maximum number of transmissions of the transmitted data; or
  • the processor is configured to determine the maximum number of transmissions from an indication message from the receiving end; the maximum number of transmissions is determined by the receiving end according to a system configuration and the maximum transmission delay and a single transmission delay.
  • the system configuration indicates whether the configured transmission resource is continuous or non-contiguous, or indicates a value of a time interval between the configured transmission resources, for example, a value of T_Gap.
  • the processor is configured to start a timer before sending the data, where a preset value of the timer is the maximum transmission delay corresponding to a service type of the data;
  • the transceiver sends data once to the receiving end (including the first transmission of data), and the processor reduces the maximum number of transmissions by one;
  • the transceiver stops transmitting retransmission data to the receiving end when the processor determines that the timer expires or the maximum number of transmissions is zero.
  • the sending end starts a timer before sending the data, and the sending end starts a timer when acquiring new data to be sent, or starts a timer when new data arrives at the sending end.
  • the processor is configured to start a timer before sending the data, where a preset value of the timer is a maximum transmission delay corresponding to a service type of the data;
  • the transceiver transmits data once to the receiving end (including the first transmission of data), and the processor reduces the maximum number of transmissions by one;
  • the sending and receiving The device stops sending retransmission data to the receiving end.
  • the processor is configured to start a timer before transmitting the data, and the transceiver transmits data (including first transmission data) to the receiving end, and the processor reduces the maximum number of transmissions.
  • the processor determines that the timer has not timed out, and the maximum number of transmissions is not zero, the remaining time of the timer is greater than or equal to a time required for the receiving end to receive and process the retransmitted data,
  • the transceiver sends retransmission data to the receiving end.
  • the communications device further includes:
  • a memory for storing an uplink transmission time-frequency resource pre-allocated by the receiving end to the transmitting end
  • the processor calculates the maximum number of transmissions using the following formula:
  • N_MAX Floor(Total_Delay_MAX/Single_Tx_Delay);
  • Total_Delay_MAX is the maximum transmission delay corresponding to the service type of the data
  • Single_Tx_Delay is a single transmission delay corresponding to the type of data of the data.
  • the processor when the transceiver requests the receiving end to schedule uplink transmission time-frequency resources to send data, the processor is further configured to calculate a maximum transmission number by using the following formula:
  • N_MAX Floor((Total_Delay_MAX-Delta_T)/Single_Tx_Delay);
  • Total_Delay_MAX is the maximum transmission delay corresponding to the service type of the data
  • Delta_T is the delay of requesting scheduling resources
  • Single_Tx_Delay is a single transmission delay corresponding to the type of data of the data.
  • the processor calculates a single transmission delay of the data corresponding service by using the following formula:
  • T_Gap ⁇ 0ms is the time interval between two adjacent transmission resources for transmitting uplink data
  • T_Tx>0ms is the delay required by the processor of the transmitting end to process data
  • T_Rx>0ms is received by the receiving end.
  • the delay required for the data; T_Rx>0ms indicates the delay required for the air interface to transmit data; T_Bu>0ms indicates the delay required for the data of the sender to wait for transmission in the buffer.
  • the processor calculates a delay of the request scheduling resource by using the following formula:
  • T_Gap_SR ⁇ 0ms is the time interval between two adjacent transmission resources for sending a scheduling request
  • T_AI_SR 0ms, which is the delay required for the transceiver of the transmitting end to send a scheduling request on the air interface
  • T_Gap_SR_D ⁇ 0 ms, the time interval between the transmission of the transmission request to the transceiver of the transmitting end to the transmission resource for which the receiving end allocates the uplink data.
  • the communication device By implementing the communication device provided by the embodiment, by setting the maximum transmission delay, it is possible to avoid redundant transmission caused by all the data related to the service being retransmitted by the same number of times, and reducing the information interaction between the sender and the sender. Therefore, the operation processing complexity of the retransmission is reduced, and the retransmission feedback time is reduced.
  • the communication device provided by the embodiment of the present application may also adopt a double judgment mechanism, that is, whether the maximum number of transmission times of the present application is exhausted and whether the maximum transmission delay is exhausted is combined for data transmission, and the maximum transmission delay is performed.
  • the transmitting end stops transmitting data to the receiving end, thereby avoiding redundant transmission and invalid retransmission, so that data transmission is more efficient.
  • the embodiment of the present application provides a base station, which has a function of realizing the behavior of the base station in the actual method.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the structure of the base station includes a processor and a transceiver, and the processor is configured to support the base station to perform a corresponding function in the foregoing method.
  • the transceiver is configured to support communication between the base station and the UE, and send information or signaling involved in the foregoing method to the UE, and receive information or instructions sent by the base station.
  • the base station can also include a memory for coupling with the processor that stores the necessary program instructions and data for the base station.
  • the embodiment of the present application provides a terminal, where the terminal has a function of implementing terminal behavior in the design of the foregoing method.
  • the terminal may be a D2D terminal.
  • the function can be implemented by hardware, and the structure of the UE includes a transceiver and a processor.
  • the corresponding software implementation can also be performed by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the modules can be software and/or hardware.
  • an embodiment of the present application provides a control node, which may include a controller/processor, a memory, and a communication unit.
  • the controller/processor can be used to coordinate resource management and configuration between multiple base stations.
  • the memory can be used to store program code and data for the control node.
  • the communication unit is configured to support the control node to communicate with the base station, for example, to send information of the configured resource to the base station.
  • an embodiment of the present application provides a communication system, including the base station and the terminal in the foregoing aspect.
  • the control node in the above embodiment may also be included.
  • the embodiment of the present application provides a computer storage medium for storing computer software instructions used by the base station, which includes a program designed to perform the above aspects.
  • the embodiment of the present application provides a computer storage medium for storing computer software instructions used by the UE, which includes a program designed to perform the above aspects.
  • FIG. 1 is a schematic diagram of a scenario of a future network according to an embodiment of the present application
  • FIG. 2 is a schematic structural diagram of a communication system according to an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of a communication apparatus according to an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of data retransmission between a terminal and a base station according to an embodiment of the present disclosure
  • FIG. 5 is a schematic flowchart diagram of Embodiment 1 of a data retransmission method according to an embodiment of the present disclosure
  • FIG. 6 is a schematic flowchart of Embodiment 2 of a data retransmission method according to an embodiment of the present application
  • FIG. 7 is a schematic flowchart of Embodiment 3 of a data retransmission method according to an embodiment of the present disclosure
  • FIG. 8 is a schematic diagram of transmission resources used in a data retransmission method according to an embodiment of the present disclosure.
  • FIG. 9 is another schematic diagram of a transmission resource used in a data retransmission method according to an embodiment of the present application.
  • FIG. 10 is a schematic flowchart diagram of Embodiment 4 of a data retransmission method according to an embodiment of the present disclosure
  • FIG. 11 is a schematic flowchart of Embodiment 5 of a data retransmission method according to an embodiment of the present disclosure
  • FIG. 12 is a schematic flowchart of Embodiment 6 of a data retransmission method according to an embodiment of the present disclosure
  • FIG. 13 is a schematic flowchart of Embodiment 7 of a data retransmission method according to an embodiment of the present disclosure
  • FIG. 14 is a schematic flowchart of Embodiment 8 of a data retransmission method according to an embodiment of the present disclosure
  • FIG. 15 is a schematic flowchart of Embodiment 9 of a data retransmission method according to an embodiment of the present disclosure.
  • NGMN Next Generation Mobile Network
  • eMBB enhanced mobile broadband
  • URLLC high reliability communication
  • mMTC massive machine Type Communications
  • the data retransmission scheme provided in the prior art is prone to the problem of expired data and redundant transmission.
  • the reason is mainly because the delay requirements of different services are different, and the delay consumed by one transmission ( Including waiting for transmission timing, sender processing, air interface transmission, receiving end processing, etc.) is also strongly related to system configuration such as frame structure. If it is still like existing LTE, regardless of the specific service and system configuration, only one maximum weight is specified. The number of passes, and always retransmitted according to the specified maximum number of retransmissions, is likely to cause expired data and redundant transmission, which will have a negative impact on the entire system.
  • different service types have different delay requirements. How to make data transmission meet the delay requirement is a technical direction to solve the existing technical problems.
  • the maximum number of transmissions that different system configurations can support is different. How to determine the maximum number of transmissions so that the data transmission can meet the maximum number of transmissions is another technical direction to solve the prior art problem.
  • the embodiment of the present application provides a data retransmission technology.
  • the data retransmission technique provided by the present application can be applied to any scenario in which data retransmission is required.
  • the embodiment of the present application provides a technical solution for determining whether to send retransmission data based on a timer, that is, starting a timer before the transmitting end sends new data to the receiving end. For example, when the sender acquires new data to be sent, the timer is started, or the sender generates a new data to be sent, or the new data arrives at the sender, and the timer is started, and the data is sent every time (including the first time). Before transmission and retransmission), or before the retransmission data needs to be sent, it is judged whether there is any remaining time of the timer. If there is no remaining time or the remaining time is not enough for the data transmission time, the data transmission is stopped.
  • the first transmission in the embodiment of the present application is to distinguish from the retransmission, and it can be understood that the transmitting end sends new data to the receiving end.
  • the start of the timer in all the embodiments of the present application is started when the sending end acquires the data to be sent, or the sending end generates a new data to be sent, or the new data arrives at the sending end to start the timer.
  • the timer is restarted when the retransmission data is sent after the first transmission of data.
  • the maximum transmission delay is the total delay that can be tolerated after receiving new data from the sender and sending it to the receiver to receive data.
  • the time from the acquisition of the data to the first transmission is also included.
  • the embodiment of the present application starts the timer immediately when the sender acquires new data, and the prior art ignores the buffer time and the transmission time of the first transmission, which still causes the last transmission to actually expire. Therefore, the invalid retransmission is caused. Therefore, the application starts the timer immediately when the sender acquires new data to be sent, which is more accurate than the prior art, thereby ensuring the quality and efficiency of data transmission.
  • the maximum transmission delay is different based on the service type of the data transmission. Therefore, the maximum transmission delay is determined based on the maximum transmission delay in the present application, and the maximum number of transmissions is obtained after the sender acquires new data. For the first transmission and retransmission, instead of retransmission according to the maximum number of retransmissions specified by the system, the redundant transmission caused by the same number of times of all service-related data is avoided, and the transmission end is reduced. The information exchanges with the sender, thus reducing the processing complexity of the retransmission and reducing the retransmission feedback time.
  • the embodiment of the present application may also adopt a double judgment mechanism, that is, whether the maximum transmission number of the present application is exhausted and whether the maximum transmission delay is exhausted is combined for data transmission, and the maximum transmission delay is exhausted or maximum.
  • the sender stops transmitting data to the receiver, thereby avoiding redundant transmission and invalid retransmission, so that the data transmission is more efficient.
  • the maximum number of transmissions referred to in all embodiments of the present application includes the number of first transmissions and retransmissions, which is different from the maximum number of retransmissions in the prior art.
  • the maximum transmission delay is the total delay that can be tolerated after receiving new data from the sender and sending it to the receiver to receive data, that is, the buffer time and the first transmission time before the first transmission are also included.
  • the embodiment of the present application uses the maximum number of transmissions to control the number of data transmissions performed by the transmitting end to the receiving end, and the maximum number of retransmissions used in the prior art actually considers only the number of retransmissions, and the buffering time and transmission of the first transmission. Time and so on are ignored.
  • the embodiment of the present application provides a communication system 100.
  • the communication system 100 includes at least one base station (BS) 20 and a plurality of terminals, such as terminal 1, terminal 2, terminal 3, terminal 4, and the like. These terminals may be terminals for D2D (Device to Device) communication, such as terminal 3 and terminal 4, or terminals for cellular communication, such as terminal 1, terminal 2 and terminal 4, and cellular communication is Refers to the communication between the terminal and the base station.
  • D2D Device to Device
  • terminal 3 and terminal 4 terminals for cellular communication
  • terminals for cellular communication such as terminal 1, terminal 2 and terminal 4
  • cellular communication is Refers to the communication between the terminal and the base station.
  • some terminals can perform cellular communication and can perform D2D communication as a D2D communication terminal.
  • the terminal 4 can perform both cellular communication and D2D communication.
  • the data retransmission referred to in the embodiment of the present application may be data retransmission between the base station and the cellular terminal in the communication system 100, and may also refer to data retransmission between the D2D terminals.
  • the terminal 1 In cellular communication, the terminal 1 establishes an RRC connection with the BS 20, enters an RRC connection state, and then sends an SR request to the BS 20. If the BS 20 allows the terminal 1 to transmit data uplink, an authorization command is sent to the terminal 1, and the terminal 1 receives the authorization. After the instruction, the uplink data can be sent to the BS20 according to the command requirements. The uplink data transmission between the terminal 1 and the BS 20 is an authorized transmission.
  • the terminal 2 establishes an RRC connection with the BS 20, and after entering the RRC connection state, generates a transmission signal according to the uplink transmission resource allocated in advance by the BS 20, and directly transmits the uplink data to the BS 20 without the authorization of the BS 20.
  • the terminal 2 is not authorized by the BS 20, and the data transmission directly between the terminal 2 and the BS 20 is referred to as Grant Free or Grantless transmission.
  • the data retransmission scheme referred to in the embodiment of the present application can be applied to an authorized transmission scenario or an unauthorized transmission scenario.
  • control node 60 connected to the BS 20 can perform unified scheduling on resources in the system, and can allocate resources to the terminal, perform resource reuse decision, or interfere with coordination.
  • the communication system 100 may be various radio access technology (RAT) systems, such as, for example, a Global System of Mobile communication (GSM) system, code division multiple access. (Code Division Multiple Access, CDMA) system, Wideband Code Division Multiple Access Wireless (WCDMA) system, General Packet Radio Service (GPRS) system, Long Term Evolution (LTE) System, Universal Mobile Telecommunications System (UMTS), next-generation mobile communication system (for example, 5G), Machine to Machine (M2M) communication system, and the like.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access Wireless
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • UMTS Universal Mobile Telecommunications System
  • next-generation mobile communication system for example, 5G
  • M2M Machine to Machine
  • a CDMA system can implement wireless technologies such as universal terrestrial radio access (UTRA), CDMA2000, and the like.
  • UTRA may include wideband CDMA (WCDMA) technology and other CDMA variant technologies.
  • CDMA2000 can cover the interim standard (IS) 2000 (IS-2000), IS-95 and IS-856 standards.
  • the TDMA system can implement a wireless technology such as a global system for mobile communication (GSM).
  • GSM global system for mobile communication
  • An OFDMA system can implement such as evolved universal radio land access (evolved UTRA, E-UTRA), ultra mobile broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash OFDMA And other wireless technologies.
  • UTRA and E-UTRA are UMTS and UMTS evolved versions.
  • the various versions of 3GPP in long term evolution (LTE) and LTE-based evolution are new versions of UMTS that use E-UTRA.
  • the communication system 100 can also be adapted for future-oriented communication technologies.
  • the base station is a device deployed in a radio access network to provide a wireless communication function for the terminal.
  • the base station may include various forms of macro base stations, micro base stations (also referred to as small stations), relay stations, access points, and the like.
  • the name of a device having a base station function may be different, for example, in an LTE system, an evolved Node B (evolved NodeB, eNB or eNodeB), in the third In a 3rd generation (3G) system, it is called a Node B or the like.
  • a base station or a BS the foregoing apparatus for providing a wireless communication function to a terminal.
  • the control node may connect a plurality of base stations and allocate resources for a plurality of D2D terminals and cellular terminals covered by the plurality of base stations.
  • the base station may be a Node B in a UMTS system, and the control node may be a network controller.
  • the base station may be a small station, and the control node may be a macro base station that covers the small station.
  • the control node may be a wireless network cross-system cooperative controller or the like, and the base station is a base station in the wireless network, which is not limited in the embodiment of the present application.
  • the retransmission in the embodiment of the present application may be applied to a scenario in which an uplink or downlink authorized transmission is performed, or a scenario in which an uplink is not authorized for transmission, or a scenario in which a terminal communicates with a terminal, for example, D2D (Device to Device) or Data transfer in M2M (Machine to Machine) mode.
  • the retransmission data in the embodiment of the present application is part or all of the data that is first transmitted to the receiving end before the transmitting end.
  • the transmitting end is a network side device such as a base station or a control node, and the receiving end is a terminal;
  • the transmitting end is a terminal, and the receiving end is a network side device such as a base station or a control node;
  • the transmitting end is a D2D terminal that transmits data
  • the receiving end is a D2D terminal that receives data
  • the English of the license-free transmission is denoted as Grant Free, referred to as GF.
  • Grant Free referred to as GF.
  • the unauthorized transfer can also have other representations, such as Grantless. This article does not limit the meaning of the unauthorized transfer. It can be understood that the unauthorized transfer is not a proper term, but also in practical applications. Other names may be used, but they do not depart from the essence of this patent application.
  • the unlicensed transmission is usually for uplink signal transmission, which can be understood as any one or more of the following meanings, but is limited to these.
  • an unauthorized transfer may also be understood as a combination of some of the various technical features described below or other similar meanings:
  • the unlicensed transmission may be: the network side device pre-allocates and informs the terminal device of multiple transmission resources; when the terminal device has the uplink signal transmission requirement, select at least one transmission resource from the plurality of transmission resources pre-allocated by the network side device, and use The selected transmission resource sends an uplink signal; the network side device detects an uplink signal sent by the terminal device on one or more of the pre-assigned multiple transmission resources.
  • the detection may be blind detection, or may be performed according to one of the control fields of the uplink signal, or may be detected by other means.
  • the unlicensed transmission may be: the network side device pre-allocates and informs the terminal device of multiple transmission resources, so that when the terminal device has an uplink signal transmission requirement, at least one transmission resource is selected from a plurality of transmission resources pre-allocated by the network side device.
  • the uplink signal is sent using the selected transmission resource.
  • the unlicensed transmission may be: acquiring information of a plurality of pre-assigned transmission resources, selecting at least one transmission resource from the plurality of transmission resources when the uplink signal transmission request is required, and transmitting the uplink signal by using the selected transmission resource. .
  • the obtained method can be obtained from the network side device.
  • the unlicensed transmission may be a method for realizing the uplink signal transmission of the terminal device without dynamic scheduling of the network side device, and the dynamic scheduling may refer to that the network side device uses signaling for each uplink signal transmission of the terminal device.
  • implementing uplink signal transmission of the terminal device may be understood as allowing data of two or more terminal devices to perform uplink signal transmission on the same time-frequency resource.
  • the transmission resource may be a transmission resource of one or more transmission time units after the moment when the terminal receives the signaling.
  • a transmission time unit may refer to a minimum time unit for one transmission, such as a TTI (Transmission Time Interval), the value may be 1 ms, or may be a preset transmission time unit.
  • Unlicensed transmission may refer to: the terminal device performs uplink signal transmission without requiring network side device authorization.
  • the authorization may be performed by the terminal device to send an uplink scheduling request to the network side device.
  • the network side device After receiving the scheduling request, the network side device sends an uplink grant to the terminal device, where the uplink grant indicates the uplink transmission resource allocated to the terminal device.
  • the unlicensed transmission may refer to: a contention transmission mode, which may specifically mean that multiple terminals simultaneously perform uplink signal transmission on some or all of the time-frequency resources of the same time-frequency resource allocated in advance, without the network side device Authorize.
  • Unlicensed transmission may mean that the network side device specifies a part of the uplink transmission time-frequency resources for the terminal to perform uplink signal transmission without authorization.
  • the unlicensed transmission may be: the terminal requests the network side device to schedule the uplink transmission time-frequency resource, and after using the uplink transmission time-frequency resource for uplink transmission, the uplink transmission time-frequency resource is reserved, and then the terminal needs to perform uplink transmission, and directly utilizes When the uplink transmission time-frequency resource does not need to be uplinked every time, the network side device is re-requested to schedule uplink transmission time-frequency resources.
  • the blind detection described above can be understood as the detection of data that may arrive without predicting whether or not data has arrived.
  • the blind detection can also be understood as detection without explicit signaling indication.
  • the data in this embodiment of the present application may include service data or signaling data.
  • the transmission resources in the embodiments of the present application may include, but are not limited to, a combination of one or more of the following resources:
  • Time domain resources such as radio frames, subframes, symbols, etc.
  • Frequency domain resources such as subcarriers, resource blocks, etc.
  • Airspace resources such as transmit antennas, beams, etc.
  • Code domain resources such as sparse code multiple access (English full name: Sparse Code Multiple Access, English abbreviation: SCMA) codebook, low density signature (English full name: Low Density Signature, English abbreviation: LDS) sequence, CDMA code, etc.
  • the transmitting end or the receiving end of the data retransmission in the embodiment of the present application may be collectively referred to as a communication device.
  • One implementation manner of the communication device is a network side device, and another implementation manner is a terminal.
  • the network side device may include an improved system and device as a peer device in a conventional wireless telecommunications system.
  • Such advanced or next generation devices may be included in an evolved wireless communication standard such as Long Term Evolution (LTE).
  • LTE Long Term Evolution
  • an LTE system may include an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Node B (eNB), a wireless access point, or the like instead of a conventional base station.
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • eNB Node B
  • Any such components will be referred to herein as eNBs, but it should be understood that such components are not necessarily eNBs.
  • the next generation communication system will use "gNB" instead of the eNB of the LTE system.
  • the network side device may be the BS20 or the control node 60 as shown in FIG. 2, and the terminal may be one or more of the terminal 1 or the terminal 2 or the terminal 3 shown in FIG. 2.
  • the network side device network side device may be a device for communicating with the mobile station, or may be an access point (ACCESS POINT, AP) in a Wireless Local Area Networks (WLAN), GSM or code division multiple access.
  • BTS Base Transceiver Station
  • CDMA Code Division Multiple Access
  • It can also be a base station (NodeB, NB) in WCDMA, or an evolved base station (Evolutional Node B, eNB or eNodeB) in LTE, or a relay station or an access point, or an in-vehicle device, a wearable device, and a future 5G network.
  • PLMN public land mobile network
  • a terminal may also be called a User Equipment (UE), a mobile station, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user. Device, etc.
  • the terminal can also be a site in a Wireless Local Area Networks (WLAN) (STAION, ST), which can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, and a wireless local loop (Wireless Local).
  • WLAN Wireless Local Area Networks
  • WLL Wireless Loop
  • PDA personal digital assistants
  • handheld devices with wireless communication capabilities computing devices or other processing devices connected to wireless modems
  • computing devices or other processing devices connected to wireless modems e.g, A mobile station in 5G
  • wearable devices e.g, A mobile station in 5G
  • future communication networks e.g, A mobile station in 5G or a terminal device in a future evolved PLMN network, a D2D terminal, or the like.
  • the communication device described in the embodiment of the present application can be implemented by the communication device 30 as shown in FIG.
  • FIG. 3 is a schematic structural diagram of a communication device 30 according to an embodiment of the present application.
  • the communication device 30 includes at least one processor 301, a memory 302, a communication bus 303, and at least one communication interface 304.
  • the processor 301 can be a central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present application.
  • CPU central processing unit
  • ASIC application-specific integrated circuit
  • the memory 302 can be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type that can store information and instructions.
  • the dynamic storage device can also be an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical disc storage, and a disc storage device. (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program code in the form of instructions or data structures and can be Any other media accessed, but not limited to this.
  • the memory may be present independently and connected to the processor via communication bus 103. The memory can also be integrated with the processor.
  • the memory 302 is used to store application code for executing the solution of the present application, and the processor 301 is configured to execute application code stored in the memory 302.
  • the processor 301 may be one or more CPUs; or one or more DSPs, or a baseband processor or the like.
  • the communication device 30 may include multiple processors, each of which may be a single-CPU processor or a multi-core processor.
  • a processor herein may refer to one or more devices, circuits, and/or processing cores for processing data, such as computer program instructions.
  • communication device 30 may also include an output device 305 and an input device 306.
  • Output device 305 is in communication with processor 301 and can display information in a variety of ways.
  • the output device 305 can be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector. Wait.
  • Input device 306 is in communication with processor 301 and can accept user input in a variety of ways.
  • the input device can be a mouse, a keyboard, a touch screen device, or a sensing device, and the like.
  • the communication device 30 described above may be a general communication device or a dedicated communication device.
  • the communication device 30 can be a desktop computer, a portable computer, a network server, a personal digital assistant (PDA), a mobile phone, a tablet computer, a wireless terminal device, a communication device, an embedded device, or have FIG. A device of similar structure.
  • PDA personal digital assistant
  • the embodiment of the present application does not limit the type of the communication device 30.
  • the data retransmission technique in the embodiment of the present application will be described below by using only the terminal and the base station as an example, and the terminal serves as the transmitting end and the base station serves as the receiving end.
  • the sender is a network-side device
  • the receiver is a terminal, or the sender and the receiver are both D2D terminals or M2M terminals is similar.
  • FIG. 4 is a schematic structural diagram of data retransmission between a terminal and a base station according to an embodiment of the present application.
  • the terminal provided by the embodiment of the present application includes: a transceiver 400 and a processor 401.
  • the terminal 40 may further include a memory 402, which stores a computer execution instruction, a system bus 403, and the system bus 403 is connected to the processor 401, the transceiver 400, and Memory 402 and the like.
  • the base station 41 includes a transceiver 410 and a processor 411.
  • the base station 41 can also include a memory 412 that stores computer execution instructions, a system bus 413 that connects the processor 411, the transceiver 410, the memory 412, and the like.
  • the transceiver 400 of the terminal 40 transmits the uplink initial transmission data and the corresponding retransmission data to the transceiver 410 of the base station 41 through the antenna.
  • the transceiver 410 of the base station 41 receives the first transmission data and the corresponding retransmission data transmitted from the transceiver 401 of the terminal 40 through the antenna.
  • the base station 41 also sends corresponding first transmission data or retransmission data to the terminal.
  • a first embodiment of a data retransmission method for controlling data retransmission to meet the requirement of maximum transmission delay by setting a timer in the embodiment of the present application is as follows:
  • Step 500 the transceiver 410 of the base station 41 first transmits the maximum transmission delay to the transceiver 400 of the terminal 40;
  • the value of the maximum transmission delay is obtained or determined by the base station 41 from a quality of service (QoS) parameter corresponding to the service type of the terminal 40; when the bearer is established, The base station 41 sends the RRC (Radio Resource Control) signaling to the terminal 40.
  • QoS quality of service
  • RRC Radio Resource Control
  • step 501 when the processor 401 of the terminal 40 is configured to acquire new data to be sent, for example, when the new data arrives at the transceiver 400 of the terminal 40, the timer TIMER_Tx is started immediately; the preset value of the timer TIMER_Tx is The maximum transmission delay of the service corresponding to the data;
  • the transceiver 400 of the terminal 40 transmits data to the data receiving end-base station 41 for the first time after the processor 401 starts the timer TIMER_Tx, and the transceiver 410 of the base station 41 receives the first transmission and retransmission of the transceiver 400 of the terminal 40 to it. data;
  • the transceiver 400 of the terminal 40 transmits data to the data receiving end for the first time, which can be understood as sending new data or data packets to the receiving end.
  • Step 502 The transceiver 400 of the terminal 40 retransmits the data to the base station 41 according to the maximum transmission delay when the data needs to be retransmitted; the retransmission data referred to herein includes the following two implementation manners:
  • Mode 2 considers the time when the terminal 40 transmits the retransmission data to the base station 41 and the base station 41 receives and processes the retransmission data. If the time remaining in the timer TIMER_Tx is only enough for the terminal 40 to transmit data, but not enough for the base station 41 to process the data, then After the data arrives at the base station 41, it is also invalid data, so in this case, the terminal 40 should not perform data retransmission again. This method is more accurate for retransmission control.
  • the processor 411 of the base station 41 as the receiving end can also start the corresponding timer TIMER_Rx to determine that it is necessary to discard the data that has not been successfully received.
  • the timer TIMER_Rx can be started after receiving and processing the data sent by the terminal 40 for the first time. Usually less than the maximum transmission delay allowed by the service.
  • the terminal 40 determines whether data needs to be retransmitted.
  • the second embodiment of the data retransmission method in the embodiment of the present application is as follows:
  • Step 600 when the processor 401 of the terminal 40 acquires new data to be sent, for example, when new data arrives at the transceiver 400 of the terminal 40, the timer TIMER_Tx is started immediately;
  • Step 601 The transceiver 400 of the terminal 40 waits for a certain time to determine whether the forward feedback of the base station 41 is received, such as an ACK message. If yes, the process ends; if not, it is determined that the data needs to be retransmitted to the base station 41; or this step 601 It may also be determined whether a negative feedback NACK message from the base station 41 is received, and if so, it is determined that data needs to be retransmitted to the base station 41; if no negative feedback NACK message from the base station 41 is received, the process ends;
  • Step 602 Before retransmitting the data to the base station 41, the transceiver 400 of the terminal 40 first determines whether the current retransmission meets the requirement of the maximum transmission delay, that is, whether the remaining time of the timer TIMER_Tx is sufficient to support the retransmission. If yes, go to step 603 and perform retransmission.
  • the retransmission here includes two processes, namely, mode one and mode two, and details are not described herein; if not, the process ends.
  • the terminal 40 does not have to wait for the base station 41 to feed back the data, directly in the subsequent Possible transmission occasions, such as time slots, subframes, etc., determine to retransmit the data, so compared with FIG. 6, it is not necessary to determine whether to receive negative feedback from the base station 41 such as a NACK message or not received within a certain period of time.
  • the forward feedback of the base station 41 such as an ACK message, directly determines whether the retransmission meets the maximum delay requirement after starting the timer and performing the first transmission.
  • the detailed process is shown in FIG. 7, and the remaining steps are similar to the embodiment shown in FIG. 6, and details are not described herein again.
  • the process in which the base station sends the retransmission data to the terminal or the D2D terminal sends the retransmission data to the D2D terminal, or the M2M terminal sends the retransmission data to the M2M terminal is similar, and details are not described herein.
  • the maximum transmission delay corresponding to the type of the data transmitted is different. Therefore, in this application, the maximum transmission time is determined based on the maximum transmission delay, and the retransmission process is guided by the maximum number of transmissions. There are two ways to determine the maximum number of transmissions:
  • Manner 1 The terminal determines the maximum number of transmissions from the indication message from the base station; the maximum number of transmissions is determined by the base station according to the system configuration, the maximum transmission delay, and the single transmission delay;
  • Manner 2 The terminal determines the maximum number of transmissions of the transmitted data according to the system configuration and the maximum transmission delay and the single transmission delay.
  • the data retransmission method provided by this application is introduced in two scenarios below.
  • Unlicensed scenario When the terminal uses its pre-stored base station to transmit data for its allocated uplink transmission time-frequency resources, that is, in the unlicensed transmission scenario, the resource usage is shown in Figure 8. In this scenario, the terminal is assumed to be used. A packet is sent for the first time on resource #0 of the transmitted data. After the terminal sends the data packet for the first time on #0, if it needs to retransmit, it will retransmit the data packet on #1.
  • N_MAX Floor(Total_Delay_MAX/Single_Tx_Delay);
  • Total_Delay_MAX is the maximum transmission delay corresponding to the service type of the data
  • Single_Tx_Delay is a single transmission delay corresponding to the type of data of the data.
  • the single transmission delay Single_Tx_Delay corresponding to the service type of the data is calculated as follows:
  • T_Gap ⁇ 0ms is the time interval between two adjacent transmission resources for transmitting data
  • T_Tx>0ms is the delay required for the transmitting end to process data
  • T_Rx>0ms is required for the receiving end to process the received data.
  • the time delay; the "processing data” mentioned here may be the processing of data by the physical layer, or the processing of data by the physical layer and other protocol layers.
  • the other protocol layers here refer to MAC (Media Access Control, media).
  • T_Rx>0ms indicates the delay required for air interface data transmission
  • T_Bu>0ms Indicates the delay required for the sender's data to wait for transmission in the cache.
  • Single_Tx_Delay has at least the following values:
  • the resource usage is shown in FIG. 9.
  • the terminal is assumed to be the resource SR#1 for sending the scheduling request (SR).
  • SR scheduling request
  • a scheduling request is sent on, and a certain data packet is first transmitted on the subsequent resource #0 for transmitting data.
  • the terminal After the terminal sends the data packet for the first time on #0, if it needs to retransmit, it will retransmit the data packet on #1.
  • N_MAX Floor((Total_Delay_MAX-Delta_T)/Single_Tx_Delay);
  • Total_Delay_MAX is the maximum transmission delay corresponding to the service type of the data
  • Delta_T is the delay of requesting scheduling resources
  • Single_Tx_Delay is a single transmission delay corresponding to the type of data of the data.
  • the delay Delta_T of the request scheduling resource is calculated as follows:
  • T_Gap_SR 0ms, which is the time interval between two adjacent transmission resources for transmitting a scheduling request
  • T_AI_SR 0ms, which is the delay required for the terminal to send a scheduling request on the air interface
  • T_Gap_SR_D ⁇ 0 ms, the time interval between transmission resources for which the terminal sends a scheduling request to the base station for transmitting uplink data.
  • Delta_T has the following values:
  • the single-transmission delay Single_Tx_Delay corresponding to the service type of the data is calculated in the same manner as the unlicensed transmission scenario, and is not described here.
  • a fourth embodiment of a data retransmission method for controlling data retransmission by a terminal by setting a maximum number of transmissions by a base station in the embodiment of the present application is as follows:
  • the terminal after acquiring the new data to be sent, the terminal performs the first transmission and the retransmission according to the maximum number of transmissions, instead of performing retransmission according to the maximum number of retransmissions uniformly designated by the system, and the maximum transmission.
  • the number of times is determined by the base station.
  • step 800 the processor 411 of the base station 41 determines the maximum number of transmissions of the data transmission by the terminal 40.
  • the method for determining the maximum number of transmissions by the base station 41 is as described above, and details are not described herein again.
  • step 801 the transceiver 410 of the base station 41 sends the maximum number of transmissions to the terminal 40.
  • the base station 41 can notify the terminal 40 of the determined maximum number of retransmissions as follows:
  • SI System Information
  • the notification is sent to the terminal 40 in the high-level dedicated Radio Resource Control (RRC) signaling; in the RRC reconfiguration, handover, etc.; for the authorized transmission scenario, Semi-Persistent Scheduling, SPS )Scenes;
  • RRC Radio Resource Control
  • the terminal 40 transmits data to the base station 41 based on the maximum number of transmissions. Specifically, the transceiver 400 of the terminal 40 transmits data once to the transceiver 410 of the base station 41, and the processor 401 reduces the maximum number of transmissions by one. When the maximum number of transmissions is 0, the terminal 40 may not further transmit to the base station 41. send data.
  • the following describes the fifth embodiment of the data retransmission method for controlling the terminal to perform data retransmission by setting the maximum number of transmissions by the terminal itself in the embodiment of the present application, as follows:
  • the base station 41 and the terminal 40 respectively determine the maximum number of transmissions.
  • the maximum number of transmissions is determined by the base station 41 and the terminal 40 according to the same rules, tables, formulas, etc., which are pre-agreed. The maximum number of transmissions.
  • the terminal 40 transmits data to the base station 41 based on the maximum number of transmissions. Specifically, the transceiver 400 of the terminal 40 transmits data once to the transceiver 410 of the base station 41, and the processor 401 reduces the maximum number of transmissions by one. When the maximum number of transmissions is 0, the terminal 40 may not further transmit to the base station 41. send data.
  • the base station 41 and the terminal 40 determine the maximum number of transmissions allowed by the service in the current system configuration according to a predefined formula.
  • the formula and the method for obtaining the related parameters are the same as described above, and are not described again.
  • the base station 41 first divides the service type or the QoS type corresponding to the data.
  • the base station 41 and the terminal 40 can learn the service type or the QoS parameter type, and then obtain the maximum number of transmissions currently supported according to the configured table.
  • the table 1 contains at least two columns, one for the service type or QoS type, and the other for the maximum number of transmissions that the service type or QoS type can support, as follows:
  • the service type or QoS type is 0, the corresponding maximum number of transmissions is 2, the service type or QoS type is 2, and the corresponding maximum number of transmissions is 3, and so on.
  • the maximum number of transmissions here can still be calculated according to the above formula, but the base station 41 or the terminal 40 is not required to perform calculation, and only the calculation result needs to be preset in the terminal 40 and the base station 41 according to the formula.
  • the configuration table may include a column of system configuration in addition to the above two columns, as shown in Table 2 below:
  • the corresponding maximum number of transmissions is 2. For example, if the service type or QoS type is 0, but the system configuration type is 0, the corresponding maximum transmission times.
  • the system configuration type is specifically expressed as whether the transmission resource configured by the base station 41 for the terminal 40 is continuous or non-contiguous. For example, the system configuration type is 1, indicating that the transmission resource is continuous, and the system configuration type is 0, indicating that the transmission is performed. Resources are non-contiguous; of course, here is just an example, and the system configuration type can have other representations. When the configured transmission resources are consecutive in the time domain, that is, the foregoing T_Gap time interval is 0, the maximum number of transmissions that the terminal 40 may allocate is more, and vice versa.
  • the eighth embodiment and the ninth embodiment provided by the embodiment of the present application determine the maximum number of transmissions based on the maximum transmission delay. After the sender acquires new data to be sent, the first transmission and the retransmission are performed according to the maximum number of transmissions. Retransmission is not based on the maximum number of retransmissions specified by the system, so as to avoid redundant transmission caused by the same number of times of all service-related data, and reducing information interaction between the sender and the sender. Therefore, the operation processing complexity of the retransmission is reduced, and the retransmission feedback time is reduced.
  • FIG. 12 it is a schematic diagram of Embodiment 6 of a data retransmission method based on a retransmission and a maximum number of transmissions of a feedback mechanism according to the present application.
  • step 1002 the processor 401 of the terminal 40 determines whether the retransmission meets the maximum number of transmissions. If so, in step 1003, the transceiver 41 of the terminal 40 transmits to the base station 41. Retransmit the data and stop retransmission if it is not met.
  • Embodiment 7 of a data retransmission method based on a retransmission and a maximum number of transmissions of a feedback mechanism is provided.
  • step 1101 it is determined whether the retransmission meets the requirement of the maximum number of transmissions. If so, retransmission is performed in step 1102, and retransmission is stopped if not satisfied.
  • the embodiment of the present application may also adopt a double judgment mechanism, that is, whether the maximum number of transmission times of the present application is exhausted and whether the maximum transmission delay is exhausted is combined for data transmission, and the maximum transmission delay is exhausted or the maximum transmission times are exhausted.
  • the transmitting end stops transmitting data to the receiving end, thereby avoiding redundant transmission and invalid retransmission, so that the data transmission is more efficient.
  • the terminal starts a timer when acquiring new data to be sent, and the preset value of the timer is the maximum transmission delay corresponding to the service type of the data; the terminal sends data once to the base station (including the first transmission data).
  • the first maximum number of transmissions is decremented by one; in the case of a timer timeout or when the maximum number of transmissions is zero, the terminal stops transmitting retransmission data to the base station.
  • the transmitting end stops sending heavy to the receiving end. Transmitting data; when the remaining time of the timer is greater than or equal to the time required for the receiving end to receive and process the retransmitted data, the transmitting end sends the retransmitted data to the receiving end.
  • Embodiment 8 is a schematic flowchart of Embodiment 8 of a data retransmission method for implementing a double judgment mechanism based on a feedback mechanism according to an embodiment of the present application.
  • Step 1200 the processor 401 of the terminal 40 acquires new data to be sent, for example, when the new data arrives at the transceiver 400 of the terminal 40, immediately starts the timer TIMER_Tx to perform the first transmission;
  • Step 1201 The transceiver 400 of the terminal 40 waits for a certain time to determine whether the forward feedback of the base station 41 is received, such as an ACK message. If yes, the process ends; if not, it is determined that the data needs to be retransmitted to the base station 41; or this step 1201 It may also be determined whether a negative feedback NACK message from the base station 41 is received, and if so, it is determined that data needs to be retransmitted to the base station 41; if no negative feedback NACK message from the base station 41 is received, the process ends;
  • step 1202 the processor 401 of the terminal 40 determines whether the maximum number of transmissions has been reached. If yes, the process proceeds to step 1203, where the transceiver 400 of the terminal 40 transmits the retransmission data to the base station 41; if not, the retransmission is terminated.
  • Embodiment 15 is a schematic flowchart of Embodiment 9 of a data retransmission method for implementing a double judgment mechanism based on a feedback-based mechanism according to an embodiment of the present application.
  • the terminal 40 after transmitting the data, the terminal 40 does not have to wait for the base station 41 to feed back the data, and directly determines the retransmission of the data in subsequent possible transmission occasions, such as time slots, subframes, and the like.
  • the detailed process is shown in FIG. 15 , and the remaining steps are similar to the embodiment shown in FIG. 14 , and details are not described herein again.
  • the size of the sequence numbers of the foregoing processes does not mean the order of execution sequence, and the order of execution of each process should be determined by its function and internal logic, and should not be applied to the embodiment of the present application.
  • the implementation process constitutes any limitation.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
  • the technical solution of the present application which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a computer, server, or network side device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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Abstract

本申请实施例提供一种数据重传的方法，通信装置。所述方法包括发送端向接收端传输新的数据之前启动定时器；所述定时器的预值为与所述数据的业务类型对应的最大传输时延；所述发送端在需要重传数据时向所述接收端重传所述数据；所述发送端向接收端传输所述数据；在所述定时器超时的情况下，所述发送端停止向所述接收端发送重传数据，所述重传数据为所述数据的一部分或全部。通过这种方式，避免了现有技术中由于最大重传次数还没用尽，但最大传输时延已经耗尽，发送端却仍然在发送数据导致接收端接收过期数据的问题，能够避免冗余传输，节约传输资源。

Description

一种数据重传方法、通信装置 技术领域
本申请涉及无线通信技术领域，具体涉及一种数据重传方法、通信装置。
背景技术
极高可靠、极低时延通信(Ultra-Reliability Low-Latency Communication,URLLC)未来通信网络中的一个重要场景，该场景的典型特征是可靠性高(例如达到99.999％的可靠性)且传输时延低(例如对某些业务的时延要小于1ms)。
数据的重传，例如混合自动请求重传(Hybrid Auto ReQuest，HARQ)是提高传输可靠性的重要手段，因此URLLC场景下的通信极有可能引入重传技术来达到可靠性的要求，包括基于反馈的重传技术和不基于反馈的重传技术。
基于反馈的重传技术即发送端发送数据后，等待接收端反馈对该数据的接收情况，如果发送端接收到接收端的负向反馈，如NACK(Negative ACKnowledgment)，或者发送端未接收到接收端的正向反馈，如ACK(ACKnowledge)，则发送端对数据进行重传，重传可以是前次传输的完全复制，也可以是不同的冗余版本。
不基于反馈的重传技术，即发送端发送数据后，不必等待接收端反馈对该数据的接收情况，直接在后续可能的发送时机，如时隙、子帧等，对数据进行重传，重传可以是前次传输的完全复制，也可以是不同的冗余版本。同时需要注意到，重传必然增加时延，因此，为同时满足低时延的要求，不能无限制的进行重传，而需要在时延许可的前提下，进行一定次数的重传。
LTE系统中，发送端在进行重传之前仅对重传次数进行判断，如果未达到最大重传次数，则进行重传，否则不进行重传。
发明人发现，现有技术中重传方式容易导致过期数据以及冗余传输，对于通信系统带来负面影响，无法满低时延的要求。
发明内容
本申请描述了一种数据重传方法，通信装置和系统。
本申请针对现有技术中数据重传时容易产生过期数据以及冗余传输的问题，提供了数据重传方法。
一方面，本申请实施例提供了一种发送数据时进行时延判断的技术方案，即发送端在发送所述数据之前启动定时器，包括发送端在获取到待发送的新的数据时启动定时器，或者有新的数据到达发送端时启动定时器。发送端启动定时器之后，每一次发送数据(包括首次传输和重传)之前或者在需要发送重传数据之前，判断定时器是否还有剩余时间，如果没有剩余时间或者剩余时间不够一次数据传输时间，则停止发送数据。通过这种方式，避免了现有技术中由于最大重传次数还没用尽，但最大传输时延已经耗尽，发送端却仍然在发送数据导致接收端接收过期数据的问题，能够避免冗余传输，节约传输资源。
另一方面，传输数据的业务类型的不同，其对应的最大传输时延也有差异，因此本申请实施例中基于最大传输时延确定最大传输次数，发送端获取到新的数据之后根据该最大传输次数来进行首次传输和重传，而不是依据由系统统一指定的最大重传次数来进行重传。
本实施例提供的数据重传方法，包括：
发送端确定待发送的新的数据的最大传输次数，所述最大传输次数根据最大传输时延和单次传输时延确定；所述最大传输时延由所述数据对应的业务类型决定；
所述发送端在需要重传数据时，基于所述最大传输次数发送重传数据，所述重传数据为所述数据的一部分或全部。
其中，最大传输次数包括首次发送所述新的数据和发送所述重传数据的重传次数。
一种实现方式中，发送端确定发送数据的最大传输次数，包括：
所述发送端根据系统配置以及所述最大传输时延和单次传输时延确定发送数据的最大传输次数；或
所述发送端从来自所述接收端的指示消息中确定所述最大传输次数；所述最大传输次数由所述接收端根据系统配置以及所述最大传输时延和单次传输时延确定得到。
其中，系统配置指示配置的传输资源是连续的还是非连续的，或者指示配置的传输资源之间的时间间隔的数值，例如T_Gap的值。
又一种实现方式中，所述发送端基于所述最大传输次数将所述数据传输至接收端，包括：
发送端在发送所述数据之前启动定时器，所述定时器的预值为所述与数据的业务类型对应的最大传输时延；
所述发送端每向接收端发送一次数据(包括首次传输数据)即将所述最大传输次数减一；
在所述定时器超时的情况下或所述最大传输次数为零时，所述发送端停止向所述接收端发送重传数据。
所述发送端在发送所述数据之前启动定时器，包括发送端在获取到待发送的新的数据时启动定时器，或者有新的数据到达发送端时启动定时器。
再一种实现方式中，所述发送端基于所述最大传输次数将所述数据传输至接收端，包括：
发送端在发送所述数据之前启动定时器，所述定时器的预值为所述与数据的业务类型对应的最大传输时延；
所述发送端每向接收端发送一次数据(包括首次传输数据)即将所述最大传输次数减一；
在所述定时器未超时的情况下且所述最大传输次数不为零，如果所述定时器的剩余时间小于接收端接收并处理所述重传数据所需的时间，所述发送端停止向接收端发送重传数据。
再一种实现方式中，所述发送端基于所述最大传输次数将所述数据传输至接收端，包括：
发送端在发送所述数据之前启动定时器，所述定时器的预值为所述与数据的业务类型对应的最大传输时延；
所述发送端每向接收端发送一次数据(包括首次传输数据)即将所述最大传输次数减一；
在所述定时器未超时的情况下且所述最大传输次数不为零，如果所述定时器的剩余时间大于等于接收端接收并处理所述重传数据所需的时间时，所述发送端向接收端发送重传数据。
在上述几种实现方式中，在发送端利用其预先保存的接收端为其分配的上行传输时频资源发送数据时，所述最大传输次数的计算方式为：
N_MAX＝Floor(Total_Delay_MAX/Single_Tx_Delay)；
其中，Floor()为向下取整；
Total_Delay_MAX为所述与数据的业务类型对应的最大传输时延；
Single_Tx_Delay为与数据的业务类型对应的单次传输时延。
在上述几种实现方式中，在发送端请求所述接收端调度上行传输时频资源发送数据时，所述最大传输次数的计算方式为：
N_MAX＝Floor((Total_Delay_MAX-Delta_T)/Single_Tx_Delay)；
其中，Floor()为向下取整；
Total_Delay_MAX为所述与数据的业务类型对应的最大传输时延；
Delta_T为请求调度资源的时延；
Single_Tx_Delay为与数据的业务类型对应的单次传输时延。
在上述几种实现方式中，所述
Single_Tx_Delay∈[(T_Tx+T_AI+T_Rx+T_Bu),(T_Gap+T_Tx+T_AI+T_Rx+T_Bu)]；
其中，T_Gap≥0ms，为发送上行数据的两个相邻的传输资源之间的时间间隔，T_Tx＞0ms为发送端处理数据所需要的时延；T_Rx＞0ms为接收端处理接收到的数据所需要的时延；T_Rx＞0ms表示空口传输数据所需要的时延；T_Bu＞0ms表示发送端的数据在缓存中等待发送所需要的时延。
在上述几种实现方式中，所述
Delta_T∈[(T_AI_SR+T_Gap_SR_D),(T_Gap_SR+T_AI_SR+T_Gap_SR_D)]；
其中，T_Gap_SR≥0ms，为发送调度请求的两个相邻的传输资源之间的时间间隔；
T_AI_SR＞0ms，为发送端在空口发送调度请求所需的时延；
T_Gap_SR_D≥0ms，为发送端发送调度请求到接收端为其分配的发送上行数据的 传输资源之间的时间间隔。
本实施例提供的数据重传方法，通过设置最大传输时延，可以避免所有业务相关的数据都需要重传同样的次数所导致的冗余传输，减少了发送端与发送端之间的信息交互，因此降低了重传的操作处理复杂度，减少了重传反馈时间。
又一方面，还可以采用双重判断机制，即将本申请的判断最大传输次数是否用尽和判断最大传输时延是否耗尽结合起来进行数据传输，在最大传输时延耗尽或最大传输次数用尽任一一种情况发生时，发送端都停止向接收端传输数据，从而避免冗余传输和无效的重传，以使数据传输的效率更高。
针对上行免授权传输和授权传输场景，本申请还提供了多种计算单次传输时延的方式，从而可以精确的计算不同场景下的最大传输次数，使得本申请的技术方案可以满足不同场景的要求并且满足URLLC的要求。
另一方面，本申请实施例提供了通信装置，该通信装置可以是一种网络侧设备，也可以是终端。该网络侧设备可以是一种基站，也可以是一种控制节点。当网络侧设备作为数据发送端时，终端作为数据接收端；当终端作为数据发送端时，网络侧设备作为数据接收端。
一种实现方式中，所述通信装置作为数据发送端，包括：
处理器，用于在收发器向接收端传输新的数据之前启动定时器或者所述收发器获取到所述新的数据时，所述处理器启动所述定时器；所述定时器的预值为与所述数据的业务类型对应的最大传输时延；
收发器，用于在所述处理器启动定时器后，向接收端传输所述数据；
所述处理器还用于判断所述定时器是否超时，在所述定时器未超时的情况下，所述收发器在需要重传数据时向所述接收端发送重传数据；所述重传数据为所述数据的一部分或全部；在所述定时器超时的情况下，所述收发器停止向所述接收端发送所述重传数据。
实施本申请实施例提供的通信装置，避免了现有技术中由于最大重传次数还没用尽，但最大传输时延已经耗尽，发送端却仍然在发送数据导致接收端接收过期数据的问题，能够避免冗余传输，节约传输资源。
另一种实现方式中，所述通信装置作为数据发送端，包括：
处理器，用于确定待发送的新的数据的最大传输次数，所述最大传输次数根据最大传输时延和单次传输时延确定；所述最大传输时延由所述数据对应的业务类型决定；
收发器，用于在需要重传数据时，基于所述最大传输次数发送重传数据，所述重传数据为所述数据的一部分或全部。
其中，最大传输次数包括首次发送所述新的数据和发送所述重传数据的重传次数。
一种实现方式中，所述处理器具体用于根据系统配置，以及所述最大传输时延和单次传输时延确定发送数据的最大传输次数；或
所述处理器用于从来自所述接收端的指示消息中确定所述最大传输次数；所述最大传输次数由所述接收端根据系统配置以及所述最大传输时延和单次传输时延确定得到。
其中，系统配置指示配置的传输资源是连续的还是非连续的，或者指示配置的传输资源之间的时间间隔的数值，例如T_Gap的值。
另一种实现方式中，所述处理器用于在发送所述数据之前启动定时器，所述定时器的预值为所述与数据的业务类型对应的最大传输时延；
所述收发器每向接收端发送一次数据(包括首次传输数据)，所述处理器即将所述最大传输次数减一；
在所述处理器判断定时器超时的情况下或所述最大传输次数为零时，所述收发器停止向所述接收端发送重传数据。
所述发送端在发送所述数据之前启动定时器，包括发送端在获取到待发送的新的数据时启动定时器，或者有新的数据到达发送端时启动定时器。
又一种实现方式中，所述处理器用于在发送所述数据之前启动定时器，所述定时器的预值为所述与数据的业务类型对应的最大传输时延；
所述收发器每向接收端传输一次数据(包括首次传输数据)，所述处理器即将所述最大传输次数减一；
在所述处理器判断定时器未超时的情况下且所述最大传输次数不为零，但所述定时器的剩余时间小于接收端接收并处理所述重传数据所需的时间，所述收发器停止向接收端发送重传数据。
再一种实现方式中，所述处理器用于在发送所述数据之前启动定时器所述收发器每向接收端传输一次数据(包括首次传输数据)，所述处理器即将所述最大传输次数减一；
在所述处理器判断定时器未超时的情况下，且所述最大传输次数不为零，所述定时器的剩余时间大于等于接收端接收并处理所述重传数据所需的时间，所述收发器向接收端发送重传数据。
上述几种实现方式中，所述通信装置还包括：
存储器，用于保存接收端为发送端预先分配的上行传输时频资源；
所述处理器利用如下公式计算所述最大传输次数：
N_MAX＝Floor(Total_Delay_MAX/Single_Tx_Delay)；
其中，Floor()为向下取整；
Total_Delay_MAX为所述与数据的业务类型对应的最大传输时延；
Single_Tx_Delay为与数据的业务类型对应的单次传输时延。
上述几种实现方式中，在所述收发器请求接收端调度上行传输时频资源发送数据时，所述处理器还用于通过如下公式计算最大传输次数：
N_MAX＝Floor((Total_Delay_MAX-Delta_T)/Single_Tx_Delay)；
其中，Floor()为向下取整；
Total_Delay_MAX为所述与数据的业务类型对应的最大传输时延；
Delta_T为请求调度资源的时延；
Single_Tx_Delay为与数据的业务类型对应的单次传输时延。
上述几种实现方式中，所述处理器通过如下公式计算所述数据对应业务的单次传输 时延：
Single_Tx_Delay∈[(T_Tx+T_AI+T_Rx+T_Bu),(T_Gap+T_Tx+T_AI+T_Rx+T_Bu)]；
其中，T_Gap≥0ms，为发送上行数据的两个相邻的传输资源之间的时间间隔，T_Tx＞0ms为发送端的处理器处理数据所需要的时延；T_Rx＞0ms为接收端处理接收到的数据所需要的时延；T_Rx＞0ms表示空口传输数据所需要的时延；T_Bu＞0ms表示发送端的数据在缓存中等待发送所需要的时延。
上述几种实现方式中，所述处理器通过如下公式计算所述请求调度资源的时延：
Delta_T∈[(T_AI_SR+T_Gap_SR_D),(T_Gap_SR+T_AI_SR+T_Gap_SR_D)]；
其中，T_Gap_SR≥0ms，为发送调度请求的两个相邻的传输资源之间的时间间隔；
T_AI_SR＞0ms，为发送端的收发器在空口发送调度请求所需的时延；
T_Gap_SR_D≥0ms，为发送端的收发器发送调度请求到接收端为其分配的发送上行数据的传输资源之间的时间间隔。
实施本实施例提供的通信装置，通过设置最大传输时延，可以避免所有业务相关的数据都需要重传同样的次数所导致的冗余传输，减少了发送端与发送端之间的信息交互，因此降低了重传的操作处理复杂度，减少了重传反馈时间。
又一方面，本申请实施例提供的通信装置还可以采用双重判断机制，即将本申请的判断最大传输次数是否用尽和判断最大传输时延是否耗尽结合起来进行数据传输，在最大传输时延耗尽或最大传输次数用尽任一一种情况发生时，发送端都停止向接收端传输数据，从而避免冗余传输和无效的重传，以使数据传输的效率更高。
另一方面，本申请实施例提供了一种基站，该基站具有实现上述方法实际中基站行为的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。
在一个可能的实现方式中，基站的结构中包括处理器和收发器，所述处理器被配置为支持基站执行上述方法中相应的功能。所述收发器用于支持基站与UE之间的通信，向UE发送上述方法中所涉及的信息或者信令，接收基站所发送的信息或指令。所述基站还可以包括存储器，所述存储器用于与处理器耦合，其保存基站必要的程序指令和数据。
又一方面，本申请实施例提供了一种终端，该终端具有实现上述方法设计中终端行为的功能。所述终端可以为D2D终端。所述功能可以通过硬件实现，UE的结构中包括收发器和处理器。也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。所述模块可以是软件和/或硬件。
又一方面，本申请实施例提供了一种控制节点，可以包括控制器/处理器，存储器以及通信单元。所述控制器/处理器可以用于协调多个基站之间的资源管理和配置。存储器可以用于存储控制节点的程序代码和数据。所述通信单元，用于支持该控制节点与基站进行通信，譬如将所配置的资源的信息发送给基站。
又一方面，本申请实施例提供了一种通信系统，该系统包括上述方面所述的基站和 终端。可选地，还可以包括上述实施例中的控制节点。
再一方面，本申请实施例提供了一种计算机存储介质，用于储存为上述基站所用的计算机软件指令，其包含用于执行上述方面所设计的程序。
再一方面，本申请实施例提供了一种计算机存储介质，用于储存为上述UE所用的计算机软件指令，其包含用于执行上述方面所设计的程序。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请实施例提供的未来网络的场景示意图；
图2为本申请实施例提供的通信系统的架构示意图；
图3为本申请实施例提供的通信装置的结构示意图；
图4为本申请实施例提供的终端与基站进行数据重传的结构示意图；
图5为本申请实施例提供的数据重传方法实施例一的流程示意图；
图6为本申请实施例提供的数据重传方法实施例二的流程示意图；
图7为本申请实施例提供的数据重传方法实施例三的流程示意图；
图8为本申请实施例提供的数据重传方法中使用的传输资源的一种示意图；
图9为本申请实施例提供的数据重传方法中使用的传输资源的另一种示意图；
图10为本申请实施例提供的数据重传方法实施例四的流程示意图；
图11为本申请实施例提供的数据重传方法实施例五的流程示意图；
图12为本申请实施例提供的数据重传方法实施例六的流程示意图；
图13为本申请实施例提供的数据重传方法实施例七的流程示意图；
图14为本申请实施例提供的数据重传方法实施例八的流程示意图；
图15为本申请实施例提供的数据重传方法实施例九的流程示意图。
具体实施方式
新的通信需求对现有网络提出了包括技术上和商业模式上的种种挑战，需要下一代移动网络(Next Generation Mobile Network，NGMN)来满足。如图1所示，NGMN主要移动网络业务划分为三类场景：增强移动宽带(eMBB，Enhanced Mobile Broadband)，低时延高可靠性通信URLLC以及大规模机器通信(mMTC，Massive Machine Type Communications)。
现有技术中提供的数据重传方案，容易产生过期数据以及冗余传输的问题，究其原因，主要是由于不同的业务对时延的要求不尽相同，而且一次传输所消耗的时延(包括等待传输时机、发送端处理、空口传输、接收端处理等)也与帧结构等系统配置强相关，如果仍像现有的LTE一样，不考虑具体业务以及系统配置，仅指定一种最大重传次数，并且始终按照指定的最大重传次数进行重传，那么，极有可能会导致过期数据以及冗余传输，这对整个系统会带来负面影响。一方面，不同的业务类型有不同的时延要求，如 何使得数据传输能够满足时延要求，是解决现有技术问题的一个技术方向。另一方面，不同的系统配置其能支持的最大传输次数是不同的，如何确定这一最大传输次数，使得数据传输能够满足最大传输次数的要求，是解决现有技术问题的另一技术方向。
为了解决上述提及的解决数据重传时容易产生过期数据以及冗余传输的问题，保证进行数据重传的有效性和可靠性，本申请实施例提供了一种数据重传技术。在任何一种需要进行数据重传的场景中，都可以应用本申请提供的数据重传技术。
本申请实施例提供的数据重传方案如下：
一方面，本申请实施例提供了一种基于定时器来判断是否发送重传数据的技术方案，即在发送端向接收端发送新的数据之前启动定时器。例如，发送端获取到待发送的新数据时即启动定时器，或者发送端产生了一个待发送的新数据，或者新的数据到达发送端时即启动定时器，在每一次发送数据(包括首次传输和重传)之前，或者在需要发送重传数据之前，判断定时器是否还有剩余时间，如果没有剩余时间或者剩余时间不够一次数据传输时间时，则停止发送数据。通过这种方式，避免了现有技术中由于最大重传次数还没用尽，但最大传输时延已经耗尽，发送端却仍然在发送数据导致接收端接收过期数据的问题，能够避免冗余传输，节约传输资源。
需要说明的是，本申请实施例中的首次传输是为了区别于重传，可以理解为是发送端向接收端发送新的数据。本申请所有实施例中所指的定时器的启动是发送端获取到待发送的数据时立即启动，或者发送端产生了一个待发送的新数据，或者新的数据到达发送端时即启动定时器，区别于现有技术的在首次传输数据之后发送重传数据时再启动定时器。最大传输时延是从发送端获取到新的数据之后，将其发送到接收端接收数据所能容忍的总的时延，从获取到数据进行缓存到首次传输时间也包括在内。因此，本申请实施例在发送端获取到新的数据时立即启动定时器，而现有技术将首次传输的缓存时间和传输时间都忽略了，这种方式仍然会导致最后一次传输实际上已经超时，从而导致无效的重传，因此，本申请采用发送端获取到待发送的新的数据时立即启动定时器相比现有技术而言，更加准确，从而能够保证数据传输的质量和效率。
另一方面，基于传输数据的业务类型的不同，其对应的最大传输时延也有差异，因此本申请中基于最大传输时延确定最大传输次数，发送端获取到新的数据之后根据该最大传输次数来进行首次传输和重传，而不是依据由系统统一指定的最大重传次数来进行重传，从而避免所有业务相关的数据都需要重传同样的次数所导致的冗余传输，减少了发送端与发送端之间的信息交互，因此降低了重传的操作处理复杂度，减少了重传反馈时间。
再一方面，本申请实施例还可以采用双重判断机制，即将本申请的判断最大传输次数是否用尽和判断最大传输时延是否耗尽结合起来进行数据传输，在最大传输时延耗尽或最大传输次数用尽任一一种情况发生时，发送端都停止向接收端传输数据，从而避免冗余传输和无效的重传，以使数据传输的效率更高。
需要说明的是，本申请所有实施例中所指的最大传输次数包括首次传输和重传次数在内，区别于现有技术的最大重传次数。最大传输时延是从发送端获取到新的数据之后，将其发送到接收端接收数据所能容忍的总的时延，即首次传输之前的缓存时间和首次传 输时间也包括在内。本申请实施例使用最大传输次数来控制发送端向接收端进行的数据传输次数，而现有技术采用的最大重传次数实际上只考虑了重传的次数，而将首次传输的缓存时间和传输时间等等都忽略了，这种方式仍然会导致最后一次传输实际上已经不满足最大传输时延的要求，但是仍然属于最大重传次数允许的范围内，这将导致无效的重传，因此，本申请采用最大传输次数相比现有技术的最大重传次数而言，更加准确，从而能够保证数据传输的质量和效率。
为进一步描述本申请实施例提供的数据重传技术，此处先描述一下本申请实施例提供的数据传输技术所涉及的通信系统。
如图2所示，本申请实施例提供了一种通信系统100。该通信系统100至少包括至少一个基站(base station，BS)20和多个终端，例如终端1、终端2、终端3，终端4等等。这些终端可以是用于D2D(Device to Device，端到端)通信的终端，例如终端3和终端4，也可以是用于蜂窝通信的终端，例如终端1，终端2和终端4，蜂窝通信是指终端和基站之间进行的通信。当然有一些终端既可以进行蜂窝通信可以作为D2D通信终端进行D2D通信，例如终端4既可以进行蜂窝通信也可以进行D2D通信。
本申请实施例所指的数据重传，既可以是通信系统100中的基站和蜂窝终端之间进行的数据重传，也可以指D2D终端之间进行的数据重传。
在蜂窝通信中，终端1建立与BS20的RRC连接，进入RRC连接状态，然后向BS20发送SR请求，如果BS20允许该终端1上行发送数据，会向该终端1发送授权指令，终端1接收到授权指令后，才能根据指令要求向BS20发送上行数据。终端1与BS20之间的上行数据传输为授权传输。
终端2建立与BS20的RRC连接，进入RRC连接状态后，根据BS20预先分配的上行传输资源，生成传输信号，不经BS20的授权，直接向BS20发送上行数据。为了方便描述，本文中将终端2不经过BS20授权，直接与BS20之间的数据传输称为免授权(Grant free或grantless)传输。
本申请实施例所指的数据重传方案，既可以应用于授权传输场景，也可以应用于免授权传输场景。
本申请实施例中，与BS20连接的控制节点60，可以对系统中的资源进行统一调度，可以给终端配置资源，进行资源复用决策，或者干扰协调等。
在本申请实施例中，所述通信系统100可以为各种无线接入技术(radio access technology，RAT)系统，譬如例如：全球移动通信(Global System of Mobile communication，GSM)系统，码分多址(Code Division Multiple Access，CDMA)系统，宽带码分多址(Wideband Code Division Multiple Access Wireless，WCDMA)系统，通用分组无线业务(General Packet Radio Service，GPRS)系统，长期演进(Long Term Evolution，LTE)系统，通用移动通信系统(Universal Mobile Telecommunications System，UMTS)，下一代移动通信系统(例如，5G)，和机器与机器(Machine to Machine，M2M)通信系统等。
术语“系统”可以和“网络”相互替换。CDMA系统可以实现例如通用无线陆地接入 (universal terrestrial radio access，UTRA)，CDMA2000等无线技术。UTRA可以包括宽带CDMA(wideband CDMA，WCDMA)技术和其它CDMA变形的技术。CDMA2000可以覆盖过渡标准(interim standard，IS)2000(IS-2000)，IS-95和IS-856标准。TDMA系统可以实现例如全球移动通信系统(global system for mobile communication，GSM)等无线技术。OFDMA系统可以实现诸如演进通用无线陆地接入(evolved UTRA，E-UTRA)、超级移动宽带(ultra mobile broadband，UMB)、IEEE 802.11(Wi-Fi)，IEEE 802.16(WiMAX)，IEEE 802.20，Flash OFDMA等无线技术。UTRA和E-UTRA是UMTS以及UMTS演进版本。3GPP在长期演进(long term evolution，LTE)和基于LTE演进的各种版本是使用E-UTRA的UMTS的新版本。此外，所述通信系统100还可以适用于面向未来的通信技术。
本申请实施例描述的系统架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
本申请实施例中，所述基站是一种部署在无线接入网中用以为终端提供无线通信功能的装置。所述基站可以包括各种形式的宏基站，微基站(也称为小站)，中继站，接入点等。在采用不同的无线接入技术的系统中，具备基站功能的设备的名称可能会有所不同，例如，在LTE系统中，称为演进的节点B(evolved NodeB，eNB或者eNodeB)，在第三代(3rd generation，3G)系统中，称为节点B(Node B)等。为方便描述，本申请所有实施例中，上述为终端提供无线通信功能的装置统称为基站或BS。
在图2所示的通信系统中，所述控制节点可以连接多个基站，并为所述多个基站覆盖下的多个D2D终端和蜂窝终端配置资源。例如，所述基站可以为UMTS系统中的Node B，所述控制节点可以为网络控制器。又例如，所述基站可以为小站，则所述控制节点可以为覆盖所述小站的宏基站。再例如，所述控制节点可以为无线网络跨制式协同控制器等，基站为无线网络中的基站，在本申请实施例中不作限定说明。
上述说明了本申请实施例提供的数据重传技术应用的通信系统，以下再详细说明在通信系统中本申请的具体实现过程，为了清楚简要的描述本申请实施例，首先对本申请实施例涉及到的相关概念作简单介绍。
一、本申请实施例中的“重传”可以应用于上行或下行授权传输的场景，或者上行免授权传输的场景，或者终端与终端之间通信的场景，例如，D2D(Device to Device)或M2M(Machine to Machine)模式下的数据传输。另外，本申请实施例中的所述重传数据为发送端之前向接收端首次传输的数据的一部分或全部。
二、关于“发送端”和“接收端”。
在下行传输时，发送端是基站或控制节点等网络侧设备，接收端是终端；
在上行传输时(上行免授权传输或上行授权传输)，发送端是终端，接收端是基站或控制节点等网络侧设备；
在D2D传输时，发送端是发送数据的D2D终端，接收端是接收数据的D2D终端。
三、关于“免授权传输”。
为了方便描述，本文中将免授权传输的英文表示为Grant Free，简称GF。但是，免授权传输还可以有其他的表示方式，例如Grantless，本文并不以此限定免授权传输的含义，可以理解的是，这里的免授权传输并不是一个专有名词，在实际应用中也有可能会采用其它的叫法，但是都不离本专利申请的实质。免授权传输通常是针对上行信号传输的，其可以理解为如下含义中的任一一种或多种，但是并限于这几种。例如，免授权传输也有可能被理解为是下述多种含义中的部分技术特征的组合或其他类似含义：
1)免授权传输可以指：网络侧设备预先分配并告知终端设备多个传输资源；终端设备有上行信号传输需求时，从网络侧设备预先分配的多个传输资源中选择至少一个传输资源，使用所选择的传输资源发送上行信号；网络侧设备在所述预先分配的多个传输资源中的一个或多个传输资源上检测终端设备发送的上行信号。所述检测可以是盲检测，也可能根据所述上行信号中某一个控制域进行检测，或者是其他方式进行检测。
2)免授权传输可以指：网络侧设备预先分配并告知终端设备多个传输资源，以使终端设备有上行信号传输需求时，从网络侧设备预先分配的多个传输资源中选择至少一个传输资源，使用所选择的传输资源发送上行信号。
3)免授权传输可以指：获取预先分配的多个传输资源的信息，在有上行信号传输需求时，从所述多个传输资源中选择至少一个传输资源，使用所选择的传输资源发送上行信号。获取的方式可以从网络侧设备获取。
4)免授权传输可以指：不需要网络侧设备动态调度即可实现终端设备的上行信号传输的方法，所述动态调度可以是指网络侧设备为终端设备的每次上行信号传输通过信令来指示传输资源的一种调度方式。可选地，实现终端设备的上行信号传输可以理解为允许两个或两个以上终端设备的数据在相同的时频资源上进行上行信号传输。可选地，所述传输资源可以是终端接收所述的信令的时刻以后的一个或多个传输时间单位的传输资源。一个传输时间单位可以是指一次传输的最小时间单元，比如TTI(Transmission Time Interval)，数值可以为1ms，或者可以是预先设定的传输时间单元。
5)免授权传输可以指：终端设备在不需要网络侧设备授权的情况下进行上行信号传输。所述授权可以指终端设备发送上行调度请求给网络侧设备，网络侧设备接收调度请求后，向终端设备发送上行授权，其中所述上行授权指示分配给终端设备的上行传输资源。
6)免授权传输可以指：一种竞争传输方式，具体地可以指多个终端在预先分配的相同的时频资源中的部分或全部时频资源上同时进行上行信号传输，而无需网络侧设备进行授权。
7)免授权传输可以指：网络侧设备为终端指定一部分上行传输时频资源专用于进行不需要授权的上行信号传输。
8)免授权传输可以指：终端请求网络侧设备调度上行传输时频资源，利用该上行传输时频资源进行上行传输过后，保留该上行传输时频资源，之后终端需要进行上行传输时，直接利用该部分上行传输时频资源而不需要每次进行上行传输的时候，都重新请求 网络侧设备调度上行传输时频资源。
上述盲检测可以理解为在不预知是否有数据到达的情况下，对可能到达的数据进行的检测。所述盲检测也可以理解为没有显式的信令指示下的检测。
四、关于“数据”。
本申请实施例中的数据可以为包括业务数据或者信令数据。
五、关于“传输资源”
本申请实施例中的传输资源可以包括但不限于如下资源的一种或多种的组合：
时域资源，如无线帧、子帧、符号等；
频域资源，如子载波、资源块等；
空域资源，如发送天线、波束等；
码域资源，如稀疏码多址接入(英文全称为：Sparse Code Multiple Access，英文简称为：SCMA)码本、低密度签名(英文全称为：Low Density Signature，英文简称为：LDS)序列、CDMA码等；
上行导频资源。
本申请实施例所指的用于数据重传的发送端或者接收端都可以统称为通信装置，该通信装置一种实现方式是网络侧设备，另一种实现方式是终端。
网络侧设备可以包括作为对传统无线电信系统中的对等设备的改进的系统和设备。这种高级或下一代设备可以包含在演进无线通信标准(例如长期演进(LTE))中。例如，LTE系统可以包括演进通用陆地无线接入网(E-UTRAN)节点B(eNB)、无线接入点或类似组件，而不是传统的基站。任何此类组件将在本文中被称作eNB，但是应当理解的是，此类组件不一定是eNB。下一代通信系统，将使用“gNB”代替LTE系统的eNB。
具体的，网络侧设备可以是如图2所示的BS20或者控制节点60，终端可以是图2所示的终端1或终端2或终端3中的一个或者多个。
网络侧设备网络侧设备可以是用于与移动台通信的设备，也可以是可以是无线局域网(Wireless Local Area Networks，WLAN)中的接入点(ACCESS POINT，AP)，GSM或码分多址(Code Division Multiple Access，CDMA)中的基站(Base Transceiver Station，BTS)。也可以是WCDMA中的基站(NodeB，NB)，还可以是LTE中的演进型基站(Evolutional Node B，eNB或eNodeB)，或者中继站或接入点，或者车载设备、可穿戴设备以及未来5G网络中的网络侧设备或者未来演进的公共陆地移动网络(Public Land Mobile Network，PLMN)中的网络侧设备等。
本申请结合终端描述了各个实施例。终端也可以称为用户设备(User Equipment，UE)、移动台、接入终端、用户单元、用户站、移动站、远方站、远程终端、移动设备、用户终端、无线通信设备、用户代理或用户装置等。终端还可以是无线局域网(Wireless Local Area Networks，WLAN)中的站点(STAION，ST)，可以是蜂窝电话、无绳电话、会话启动协议(Session Initiation Protocol，SIP)电话、无线本地环路(Wireless Local Loop， WLL)站、个人数字处理(Personal Digital Assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备以及未来通信网络(例如，5G)中的移动台或者未来演进的PLMN网络中的终端设备，D2D终端等。
本申请实施例中所述的通信装置可以由如图3中所示的通信装置30方式来实现。
图3是本申请实施例提供的通信装置30的结构示意图。其中，通信装置30包括至少一个处理器301、存储器302、通信总线303和至少一个通信接口304。
处理器301可以为中央处理器(CPU)、微处理器、特定应用集成电路(application-specific integrated circuit，ASIC)，或一个或多个用于控制本申请方案程序执行的集成电路。
存储器302可以是只读存储器(read-only memory，ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(random access memory，RAM)或者可存储信息和指令的其他类型的动态存储设备，也可以是电可擦可编程只读存储器(Electrically Erasable Programmable Read-Only Memory，EEPROM)、只读光盘(Compact Disc Read-Only Memory，CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。存储器可以是独立存在，通过通信总线103与处理器相连接。存储器也可以和处理器集成在一起。
其中，存储器302用于存储执行本申请方案的应用程序代码，处理器301用于执行存储器302中存储的应用程序代码。
在具体实现中，作为一种实施例，处理器301可以是一个或多个CPU；或者一个或多个DSP，或者是基带处理器等。例如图3中所示的CPU0和CPU1。
在具体实现中，作为一种实施例，通信装置30可以包括多个处理器，每个处理器可以是一个单核(single-CPU)处理器，也可以是一个多核(multi-CPU)处理器。这里的处理器可以指一个或多个设备、电路、和/或用于处理数据(例如计算机程序指令)的处理核。
在具体实现中，作为一种实施例，通信装置30还可以包括输出设备305和输入设备306。输出设备305和处理器301通信，可以以多种方式来显示信息。例如，输出设备305可以是液晶显示器(Liquid Crystal Display，LCD)，发光二级管(Light Emitting Diode，LED)显示设备，阴极射线管(cathode ray tube，CRT)显示设备，或投影仪(projector)等。输入设备306和处理器301通信，可以以多种方式接受用户的输入。例如，输入设备可以是鼠标、键盘、触摸屏设备或传感设备等。
上述的通信装置30可以是一个通用通信装置或者是一个专用通信装置。在具体实现中，通信装置30可以是台式机、便携式电脑、网络服务器、掌上电脑(Personal Digital Assistant，PDA)、移动手机、平板电脑、无线终端设备、通信设备、嵌入式设备或有图3中类似结构的设备。本申请实施例不限定通信装置30的类型。
为了便于理解和说明，以下仅以终端和基站作为示例，并且终端作为发送端，基站作为接收端，对本申请实施例的数据重传技术进行说明。发送端为网络侧设备，接收端 为终端，或者发送端和接收端都为D2D终端或M2M终端的场景与之类似。
图4示意了本申请实施例的终端与基站进行数据重传的结构示意图。
本申请实施例提供的终端，包括：收发器400和处理器401，该终端40还可以包括存储器402，其存储计算机执行指令；系统总线403，该系统总线403连接处理器401，收发器400和存储器402等。基站41包括收发器410和处理器411，该基站41还可以包括存储器412，其存储计算机执行指令；系统总线413，该系统总线413连接处理器411，收发器410和存储器412等。终端40的收发器400通过天线向基站41的收发器410发送上行初传数据和相应的重传数据。基站41的收发器410通过天线接收来自终端40的收发器401发送的首次传输数据和相应的重传数据。当然基站41也会向终端发送相应的首次传输数据或重传数据。
下面，将结合图4，说明终端与基站进行数据重传的各种方法实施例。
应理解，以下各个实施例的方法中所示的步骤或操作仅仅作为示例，也可以执行其他操作或者各种操作的变形。并且，在具体实施时，各个步骤还可以按照与本申请实施例中所述的不同的顺序来执行，并且有可能并非执行本申请实施例所示出的全部操作或步骤。或者，也可能执行本申请各实施例所示出的更多的操作或步骤。
结合图4和图5，说明本申请实施例中，通过设置定时器来控制数据重传满足最大传输时延的要求的数据重传方法实施例一，如下：
步骤500，基站41的收发器410首先将最大传输时延发送给终端40的收发器400；
一种可能的实现方式中，最大传输时延的值由基站41从与该终端40的业务类型对应的服务质量(Quality of Service,QoS)参数中获取或确定；该QoS参数在承载建立时，由基站41通过RRC(Radio Resource Control，无线资源控制)信令下发给终端40。
步骤501，终端40的处理器401，用于获取到待发送的新的数据时，例如，在新的数据到达本终端40的收发器400，立即启动定时器TIMER_Tx；定时器TIMER_Tx的预值为该数据对应的业务的最大传输时延；
终端40的收发器400在所述处理器401启动定时器TIMER_Tx后，首次向数据接收端-基站41传输数据，基站41的收发器410接收终端40的收发器400向其首次传输和重传的数据；
此处的终端40的收发器400首次向数据接收端传输数据可以理解为是向接收端发送新的数据或者数据包。
步骤502，终端40的收发器400在需要重传数据时，根据最大传输时延向基站41重传所述数据；这里所指的重传数据，包括如下两种实现方式：
方式一：在定时器TIMER_Tx未超时的情况下，终端40向基站41发送重传数据；在定时器TIMER_Tx超时的情况下，终端40停止向基站41发送重传数据。
方式二：在定时器TIMER_Tx未超时的情况下，且其剩余时间小于基站41接收并处理所述重传数据所需的时间时，终端40停止向基站41发送重传数据.
方式二考虑了终端40向基站41发送重传数据加上基站41接收并处理该重传数据的时间，如果定时器TIMER_Tx剩余的时间只够终端40发送数据，但不够基站41处理该数据，则该数据到达基站41之后，也是无效的数据，因此这种情况终端40也不应该再进行数据重传，这种方式对于重传的控制更加精确。
作为接收端的基站41的处理器411也可以启动相应定时器TIMER_Rx，来判断合适需要丢弃没有成功接收的数据，该定时器TIMER_Rx可以在接收并处理完终端40首次发送的数据后启动，其取值通常小于该业务允许的最大传输时延。
上述实施例中，终端40确定是否需要重传数据，有两种机制：一种是基于反馈的机制，另一种是不基于反馈的机制。
如图6所示，在基于反馈的机制中，本申请实施例的数据重传方法实施例二流程如下：
步骤600，终端40的处理器401在获取到待发送的新的数据时，例如，在新的数据到达本终端40的收发器400时，立即启动定时器TIMER_Tx；
步骤601，终端40的收发器400等待一定时间，判断是否收到基站41的正向反馈如ACK消息，若是，则结束流程；若否，则确定需要向基站41重传数据；或者此步骤601还可以是判断是否接收到来自基站41的负向反馈NACK消息，若是，则确定需要向基站41重传数据；若没有接收到来自基站41的负向反馈NACK消息，则结束流程；
步骤602，终端40的收发器400在向基站41重传数据之前，首先判断本次重传是否满足最大传输时延的要求，也即判断定时器TIMER_Tx剩余的时间是否足够支持本次重传？若是，则转入步骤603，进行重传，这里的重传包括上述方式一和方式二两种流程，在此不再赘述；若否，则结束流程。
如图7所示，在不基于反馈的机制中，本申请实施例的数据重传方法实施例三中，终端40则发送数据后，不必等待基站41反馈对该数据的接收情况，直接在后续可能的发送时机，如时隙、子帧等，确定对数据进行重传，因此与图6相比，不需要判断是否收到来自基站41的负向反馈如NACK消息或者在一定时间未收到基站41的正向反馈如ACK消息，在启动定时器并进行首次传输之后，直接判断重传是否满足最大时延要求。具体流程详见图7，其余步骤与图6所示的实施例类似，在此不再赘述。
实施上述数据重传方法，在终端获取到待发送的新的数据时即启动定时器，每一次发送数据(包括首次传输和重传)之前，或者在发送重传数据之前，判断定时器是否还有剩余时间，如果没有剩余时间或者剩余时间不够一次数据传输时间时，则停止发送数据。通过这种方式，避免了现有技术中由于最大重传次数还没用尽，但最大传输时延已经耗尽，终端却仍然在向基站发送数据导致基站接收过期数据的问题，能够避免冗余传输，节约传输资源。
基站向终端发送重传数据或者D2D终端向D2D终端发送重传数据，或者M2M终端向M2M终端发送重传数据的过程与之类似，不再赘述。
另一方面，基于传输数据的业务类型的不同，其对应的最大传输时延也有差异，因此本申请中基于最大传输时延确定最大传输次数，以最大传输次数来指导重传过程。该最大传输次数有两种确定方式，分别是：
方式一：终端从来自基站的指示消息中确定最大传输次数；所述最大传输次数由基站根据系统配置以及最大传输时延和单次传输时延确定得到；
方式二：终端自己根据系统配置以及最大传输时延和单次传输时延确定发送数据的最大传输次数。
下面分两种场景介绍本申请提供的数据重传方法。
免授权场景：在终端利用其预先保存的基站为其分配的上行传输时频资源发送数据 时，即免授权传输场景中，其资源使用情况参见图8，这种场景下，假设终端在用于发送数据的资源#0上首次发送某数据包。终端在#0上首次发送数据包后，如需重传，会在#1上重传该数据包。
不管是终端还是基站来计算最大传输次数N_MAX，其计算方式为：
N_MAX＝Floor(Total_Delay_MAX/Single_Tx_Delay)；
其中，Floor()为向下取整；例如：Floor(3.6)＝3；
Total_Delay_MAX为与数据的业务类型对应的最大传输时延；
Single_Tx_Delay为与数据的业务类型对应的单次传输时延。
与数据的业务类型对应的单次传输时延Single_Tx_Delay的计算方式如下:
Single_Tx_Delay∈[(T_Tx+T_AI+T_Rx+T_Bu),(T_Gap+T_Tx+T_AI+T_Rx+T_Bu)]；
其中，T_Gap≥0ms，为发送数据的两个相邻的传输资源之间的时间间隔，T_Tx＞0ms为发送端处理数据所需要的时延；T_Rx＞0ms为接收端处理接收到的数据所需要的时延；这里所说的“处理数据”可以是物理层对数据的处理，也可能是物理层以及其他协议层对数据的处理，这里的其他协议层指的是MAC(Media Access Control ，媒体接入控制)层、RLC(Radio Link Control，无线链路控制)层、PDCP(Packet Data Convergence Protocol，分组数据汇聚层协议)层；T_Rx＞0ms表示空口传输数据所需要的时延；T_Bu＞0ms表示发送端的数据在缓存中等待发送所需要的时延。
在具体实现中，Single_Tx_Delay至少有如下几种取值方式：
Single_Tx_Delay＝T_Gap+T_Tx+T_AI+T_Rx+T_Bu；
或Single_Tx_Delay＝T_Tx+T_AI+T_Rx+T_Bu；
或Single_Tx_Delay＝T_Gap/2+T_Tx+T_AI+T_Rx+T_Bu；
或Single_Tx_Delay＝T_Gap/2+T_AI+T_Bu。
授权场景：
在发终端请求基站调度上行传输时频资源发送数据时，即授权传输场景中，其资源使用情况参见图9，这种场景下，假设终端在用于发送调度请求(SR)的资源SR#1上发送调度请求，在其后的用于发送数据的资源#0上首次发送某数据包。终端在#0上首次发送数据包后，如需重传，会在#1上重传该数据包。
不管是终端还是基站来计算最大传输次数N_MAX，其计算方式为：
N_MAX＝Floor((Total_Delay_MAX-Delta_T)/Single_Tx_Delay)；
其中，Floor()为向下取整；例如：Floor(3.6)＝3；
Total_Delay_MAX为与数据的业务类型对应的最大传输时延；
Delta_T为请求调度资源的时延；
Single_Tx_Delay为与数据的业务类型对应的单次传输时延。
其中，请求调度资源的时延Delta_T的计算方式如下：
Delta_T∈[(T_AI_SR+T_Gap_SR_D),(T_Gap_SR+T_AI_SR+T_Gap_SR_D)]；
T_Gap_SR≥0ms，为发送调度请求的两个相邻的传输资源之间的时间间隔；
T_AI_SR＞0ms，为终端在空口发送调度请求所需的时延；
T_Gap_SR_D≥0ms，为终端发送调度请求到基站为其分配的发送上行数据的传输资源之间的时间间隔。
具体实现中，Delta_T有如下几种取值方式：
Delta_T＝T_Gap_SR+T_AI_SR+T_Gap_SR_D；或
Delta_T＝T_AI_SR+T_Gap_SR_D；或
Delta_T＝T_Gap_SR/2+T_AI_SR+T_Gap_SR_D。
这种场景下，与数据的业务类型对应的单次传输时延Single_Tx_Delay的计算方式与免授权传输场景相同，在此不再赘述。
下面结合图4和图10，说明本申请实施例中，通过基站设置最大传输次数来控制终端进行数据重传的数据重传方法实施例四，如下：
本实施例四中，终端获取到待发送的新的数据之后，根据该最大传输次数来进行首次传输和重传，而不是依据由系统统一指定的最大重传次数来进行重传，并且最大传输次数由基站确定。
具体如下：
步骤800，基站41的处理器411确定终端40进行数据传输的最大传输次数；基站41确定最大传输次数的计算方式如上述，在此不再赘述。
步骤801，基站41的收发器410将最大传输次数发送给终端40；具体实现中，基站41可以将确定的最大重传次数通过如下方式告知终端40：
(1)广播，如携带在系统消息(System Information,SI)中通知给终端40；适用于免授权传输场景；
(2)携带在高层专用无线资源控制(Radio Resource Control,RRC)信令中通知给终端40；如RRC重配置、切换等指令中；适用于授权传输场景、半静态调度(Semi-PersistentScheduling，SPS)场景；
(3)携带在底层控制信号中通知给终端40，如下行控制信息(Downlink ControlInformation，DCI)中。
步骤802，终端40基于最大传输次数，将数据发送至基站41。具体的，终端40的收发 器400每向基站41的收发器410发送一次数据，其处理器401即将最大传输次数减1，当最大传输次数为0的时候，终端40则不可以再向基站41发送数据。
下面结合图4和图11，说明本申请实施例中，由终端自己设置最大传输次数来控制终端进行数据重传的数据重传方法实施例五，如下：
步骤900，基站41和终端40分别确定最大传输次数，在本实施例中，最大传输次数由基站41和终端40根据预先约定的相同的规则、表格、公式等确定当前对该业务所能进行的最大传输次数。
步骤901，终端40基于最大传输次数，将数据发送至基站41。具体的，终端40的收发器400每向基站41的收发器410发送一次数据，其处理器401即将最大传输次数减1，当最大传输次数为0的时候，终端40则不可以再向基站41发送数据。
上述步骤900在具体实现过程中，可以采用以下两种方式：
(1)公式方式
基站41和终端40根据预先定义的公式，确定当前系统配置下，业务所允许的最大传输次数，该公式以及相关参数的获取方法前述相同，不再赘述；
(2)表格方式
基站41首先对数据对应的业务类型或QoS类型进行划分，在建立业务承载时，基站41和终端40能够获知业务类型或QoS参数类型，再基于配置的表格获取当前所能支持的最大传输次数。该表格1中至少包含两列，一列为业务类型或QoS类型，另一列为业务类型或QoS类型对应的所能支持的最大传输次数，如下所示：
表1
业务类型或QoS类型 最大传输次数
0 2
1 3
2 4
例如，业务类型或QoS类型为0，其对应的最大传输次数为2，业务类型或QoS类型为2，其对应的最大传输次数为3，其他依次类推。这里的最大传输次数仍然可以根据上述的公式计算得出，但是不需要基站41或终端40进行计算，只需要依据公式将计算结果在终端40和基站41上预先设置即可。
另一种实现方式中，配置表格除以上两列之外，还可能包括系统配置的列，如下表格2：
表2
Figure PCTCN2018073855-appb-000001
例如，业务类型或QoS类型为0，但系统配置类型为0，则对应的最大传输次数为2；再如，业务类型或QoS类型为0，但系统配置类型为1，则对应的最大传输次数为4；这里的系统配置类型具体表示为基站41为终端40配置的传输资源是连续的还是非连续的，例如系统配置类型为1，表示传输资源是连续的，系统配置类型为0，表示传输资源是非连续的；当然此处仅为举例，系统配置类型还可以有其他的表示方式。当配置的传输资源在时域上是连续的时候，即前述的T_Gap时间间隔为0，该终端40可能分配的最大传输次数就较多，反之较少。
本申请实施例提供的实施例八和实施例九，基于最大传输时延确定最大传输次数，发送端获取到待发送的新的数据之后，根据该最大传输次数来进行首次传输和重传，而不是依据由系统统一指定的最大重传次数来进行重传，从而避免所有业务相关的数据都需要重传同样的次数所导致的冗余传输，减少了发送端与发送端之间的信息交互，因此降低了重传的操作处理复杂度，减少了重传反馈时间。
同样的，基于最大传输次数来进行数据重传，也有基于反馈的重传和不基于反馈的重传两种流程。
参见图12，为本申请基于反馈机制的重传和最大传输次数来进行数据重传方法实施例六的示意图。
与图6相似，但在重传数据之前，在步骤1002，终端40的处理器401是判断重传是否满足最大传输次数的要求，若是则在步骤1003，终端40的收发器41向基站41发送重传数据，若不满足就停止重传。
参见图13，为本申请不基于反馈机制的重传和最大传输次数来进行数据重传方法实施例七的示意图。
与图7相似，但在重传数据之前，在步骤1101是判断重传是否满足最大传输次数的要求，若是则在步骤1102进行重传，若不满足就停止重传。
本申请实施例还可以采用双重判断机制，即将本申请的判断最大传输次数是否用尽和判断最大传输时延是否耗尽结合起来进行数据传输，在最大传输时延耗尽或最大传输次数用尽任一一种情况发生时，发送端都停止向接收端传输数据，从而避免冗余传输和无效的重传，以使数据传输的效率更高。
具体的，终端在获取到待发送的新的数据时启动定时器，定时器的预值为所述与数据的业务类型对应的最大传输时延；终端每向基站发送一次数据(包括首次传输数据)即将所述最大传输次数减一；在定时器超时的情况下或所述最大传输次数为零时，所述终端停止向基站发送重传数据。
进一步的，在定时器未超时且所述最大传输次数不为零时，但定时器的剩余时间小于接收端接收并处理所述重传数据所需的时间时，发送端停止向接收端发送重传数据；当定时器的剩余时间大于等于接收端接收并处理重传数据所需的时间时，发送端向接收端发送重传数据。
参见图14，为本申请实施例基于反馈的机制实行双重判断机制的数据重传方法实施例八的流程示意图。
方法步骤如下：
步骤1200，终端40的处理器401在该终端40获取到待发送的新的数据，例如新的数据到达本终端40的收发器400时，立即启动定时器TIMER_Tx，进行首次传输；
步骤1201，终端40的收发器400等待一定时间，判断是否收到基站41的正向反馈如ACK消息，若是，则结束流程；若否，则确定需要向基站41重传数据；或者此步骤1201还可以是判断是否接收到来自基站41的负向反馈NACK消息，若是，则确定需要向基站41重传数据；若没有接收到来自基站41的负向反馈NACK消息，则结束流程；
步骤1202，终端40的处理器401判断是否到达最大传输次数，若是，则转入步骤1203，由终端40的收发器400向基站41发送重传数据；若否，则结束重传。
参见图15，为本申请实施例不基于反馈的机制实行双重判断机制的数据重传方法实施例九的流程示意图。
本实施例中，终端40则发送数据后，不必等待基站41反馈对该数据的接收情况，直接在后续可能的发送时机，如时隙、子帧等，确定对数据进行重传，因此与图14相比，不需要判断是否收到来自基站41的负向反馈如NACK消息或者在一定时间未收到基站41的正向反馈如ACK消息，在启动定时器并进行首次传输之后，直接判断重传是否满足最大时延要求。具体流程详见图15，其余步骤与图14所示的实施例类似，在此不再赘述。
应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以 是计算机，服务器，或者网络侧设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (20)

  1. 一种数据重传的方法，其特征在于，包括：
    发送端向接收端传输新的数据之前启动定时器；所述定时器的预值为与所述数据的业务类型对应的最大传输时延；
    所述发送端向接收端传输所述数据；
    在所述定时器未超时的情况下，所述发送端在需要重传数据时向所述接收端发送重传数据；所述重传数据为所述数据的一部分或全部；
    在所述定时器超时的情况下，所述发送端停止向所述接收端发送所述重传数据。
  2. 如权利要求1所述的数据重传的方法，其特征在于，所述发送端向接收端传输新的数据之前启动定时器包括：所述发送端获取到所述新的数据时启动所述定时器。
  3. 如权利要求1或2所述的数据重传方法，其特征在于，在所述定时器未超时的情况下，所述发送端在需要重传数据时向所述接收端发送所述重传数据包括：
    在所述定时器未超时的情况下，且所述定时器的剩余时间大于等于接收端接收并处理所述重传数据所需的时间，所述发送端向接收端发送所述重传数据。
  4. 如权利要求1或2所述的数据重传方法，其特征在于，在所述定时器未超时的情况下，所述发送端在需要重传数据时向所述接收端发送重传数据包括：
    在所述定时器未超时的情况下，且其所述定时器的剩余时间小于接收端接收并处理所述重传数据所需的时间，所述发送端停止向接收端发送所述重传数据。
  5. 如权利要求1或2所述的数据重传方法，其特征在于，所述方法还包括：
    发送端判断本次传输是否超过最大传输次数，在所述定时器未超时的情况下，如果本次传输未超过最大传输次数，所述发送端向所述接收端发送所述重传数据。
  6. 如权利要求1或2所述的数据重传方法，其特征在于，所述方法还包括：
    发送端判断本次传输是否超过最大传输次数，在所述定时器未超时的情况下，如果本次传输超过最大传输次数，所述发送端停止向所述接收端发送所述重传数据。
  7. 如权利要求6所述的数据重传方法，其特征在于，在发送端利用其预先保存的接收端为其分配的上行传输时频资源发送所述数据时，所述最大传输次数的计算方式为：
    N_MAX＝Floor(Total_Delay_MAX/Single_Tx_Delay)；
    其中，Floor()为向下取整；
    Total_Delay_MAX为所述与数据的业务类型对应的最大传输时延；
    Single_Tx_Delay为所述数据对应业务的单次传输时延。
  8. 如权利要求6所述的数据重传方法，其特征在于，在发送端请求所述接收端调度上行传输时频资源发送所述数据时，所述最大传输次数的计算方式为：
    N_MAX＝Floor((Total_Delay_MAX-Delta_T)/Single_Tx_Delay)；
    其中，Floor()为向下取整；
    Total_Delay_MAX为所述与数据的业务类型对应的最大传输时延；
    Delta_T为请求调度资源的时延；
    Single_Tx_Delay为所述数据对应业务的单次传输时延。
  9. 如权利要求7或8所述的数据重传方法，其特征在于，所述
    Single_Tx_Delay∈[(T_Tx+T_AI+T_Rx+T_Bu),(T_Gap+T_Tx+T_AI+T_Rx+T_Bu)]；
    其中，T_Gap≥0ms，为发送上行数据的两个相邻的传输资源之间的时间间隔，T_Tx＞0ms为发送端处理数据所需要的时延；T_Rx＞0ms为接收端处理接收到的数据所需要的时延；T_Rx＞0ms表示空口传输数据所需要的时延；T_Bu＞0ms表示发送端的数据在缓存中等待发送所需要的时延。
  10. 如权利要求8所述的数据重传方法，其特征在于，所述
    Delta_T∈[(T_AI_SR+T_Gap_SR_D),(T_Gap_SR+T_AI_SR+T_Gap_SR_D)]；
    其中，T_Gap_SR≥0ms，为发送调度请求的两个相邻的传输资源之间的时间间隔；
    T_AI_SR＞0ms，为发送端在空口发送调度请求所需的时延；
    T_Gap_SR_D≥0ms，为发送端发送调度请求到接收端为其分配的发送上行数据的传输资源之间的时间间隔。
  11. 一种通信装置，其作为数据发送端，其特征在于，包括：
    处理器，用于在收发器向接收端传输新的数据之前启动定时器；所述定时器的预值为与所述数据的业务类型对应的最大传输时延；
    收发器，用于在所述处理器启动定时器后，向接收端传输所述数据；
    所述处理器还用于判断所述定时器是否超时，在所述定时器未超时的情况下，所述收发器在需要重传数据时向所述接收端发送重传数据；所述重传数据为所述数据的一部分或全部；在所述定时器超时的情况下，所述收发器停止向所述接收端发送所述重传数据。
  12. 如权利要求11所述的通信装置，其特征在于，所述收发器获取到所述新的数据时，所述处理器启动所述定时器。
  13. 如权利要求11或12所述的通信装置，其特征在于，在所述处理器判断所述定时器未超时的情况下，且所述定时器的剩余时间大于等于接收端接收并处理所述重传数据所需的时间，所述收发器向接收端发送所述重传数据。
  14. 如权利要求11或12所述的通信装置，其特征在于，在所述处理器判断所述定时器未超时的情况下，且所述定时器的剩余时间小于接收端接收并处理所述重传数据所需的时间，所述收发器停止向接收端发送所述重传数据。
  15. 如权利要求11或12所述的通信装置，其特征在于，在所述处理器判断所述定时器未超时的情况下，且本次传输未超过最大传输次数，所述收发器向所述接收端发送所述重传数据。
  16. 如权利要求11或12所述的通信装置，其特征在于，在所述处理器判断所述定时器未超时的情况下，且本次传输超过最大传输次数，所述收发器停止向所述接收端发送所述重传数据。
  17. 如权利要求12所述的通信装置，其特征在于，包括：
    存储器，用于存储接收端为发送端预先分配的上行传输时频资源；
    在所述收发器通过所述存储器预先保存的上行传输时频资源发送所述数据时，所述处理器还用于通过如下公式计算最大传输次数：
    N_MAX＝Floor(Total_Delay_MAX/Single_Tx_Delay)；
    其中，Floor()为向下取整；
    Total_Delay_MAX为所述与数据的业务类型对应的最大传输时延；
    Single_Tx_Delay为与数据的业务类型对应的单次传输时延。
  18. 如权利要求12所述的通信装置，其特征在于，在所述收发器请求所述接收端调度上行传输时频资源发送所述数据时，所述处理器还用于通过如下公式计算最大传输次数：
    N_MAX＝Floor((Total_Delay_MAX-Delta_T)/Single_Tx_Delay)；
    其中，Floor()为向下取整；
    Total_Delay_MAX为所述与数据的业务类型对应的最大传输时延；
    Delta_T为请求调度资源的时延；
    Single_Tx_Delay为与数据的业务类型对应的单次传输时延。
  19. 如权利要求17或18所述的通信装置，其特征在于，所述
    Single_Tx_Delay∈[(T_Tx+T_AI+T_Rx+T_Bu),(T_Gap+T_Tx+T_AI+T_Rx+T_Bu)]；
    其中，T_Gap≥0ms，为发送上行数据的两个相邻的传输资源之间的时间间隔，T_Tx＞0ms为发送端的所述处理器处理数据所需要的时延；T_Rx＞0ms为接收端处理接收到的数据所需要的时延；T_Rx＞0ms表示空口传输数据所需要的时延；T_Bu＞0ms表示发送端的数据在缓存中等待发送所需要的时延。
  20. 如权利要求18所述的通信装置，其特征在于，所述
    Delta_T∈[(T_AI_SR+T_Gap_SR_D),(T_Gap_SR+T_AI_SR+T_Gap_SR_D)]；
    其中，T_Gap_SR≥0ms，为发送调度请求的两个相邻的传输资源之间的时间间隔；
    T_AI_SR＞0ms，为发送端的收发器在空口发送调度请求所需的时延；
    T_Gap_SR_D≥0ms，为发送端的收发器发送调度请求到接收端为其分配的发送上行数据的传输资源之间的时间间隔。
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