WO2016115916A1 - 数据包的重传方法及装置 - Google Patents

数据包的重传方法及装置 Download PDF

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Publication number
WO2016115916A1
WO2016115916A1 PCT/CN2015/090186 CN2015090186W WO2016115916A1 WO 2016115916 A1 WO2016115916 A1 WO 2016115916A1 CN 2015090186 W CN2015090186 W CN 2015090186W WO 2016115916 A1 WO2016115916 A1 WO 2016115916A1
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Prior art keywords
data packet
transmission
feedback
scheduling
buffer
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PCT/CN2015/090186
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English (en)
French (fr)
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许倩倩
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中兴通讯股份有限公司
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Priority to EP15878585.7A priority Critical patent/EP3249843A4/en
Priority to JP2017538685A priority patent/JP2018509037A/ja
Publication of WO2016115916A1 publication Critical patent/WO2016115916A1/zh

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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
    • H04L1/1874—Buffer management
    • 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

Definitions

  • the present invention relates to the field of communications, and in particular to a method and apparatus for retransmitting data packets.
  • each type of service uses a quality of service (QOS) level.
  • QOS quality of service
  • Qos Class Identifier (QCI) index representation Currently, the 9 types of QCI services given by the protocol, each type of QCI service clearly specifies the packet delay (Packet Delay Budget, PDB for short), indicating that the packet data packet is in the handheld terminal (also called user equipment, User Equipment, Referred to as the maximum delay between the UE and the core network, the protocol clearly stipulates that 98% of the packets of any service should meet the delay requirement. Therefore, in order to ensure the validity of the packet, this value is an important consideration for the base station scheduler. One of the parameters.
  • the protocol also specifies the Packet Error Loss Rate (PER) of each QCI service: it indicates the packet loss rate of the radio link layer except for congestion.
  • PER Packet Error Loss Rate
  • the radio link control (RLC) layer of the transmitting end has sent the upper limit of the proportion of the data packet that the receiving end RLC layer did not successfully receive.
  • the RLC layer has two modes: Unacknowledged Mode (UM) and Acknowledged Mode (AM).
  • UM Unacknowledged Mode
  • AM Acknowledged Mode
  • the RLC layer has a retransmission function for the transmitted data, while in the UM mode, the RLC layer has no retransmission function.
  • the AM mode with the retransmission function needs to be retransmitted according to the reporting feedback of the UE, so that the transmission delay of the data packet is increased, and for some services with high delay requirements, for example, voice service (time delay of 100 ms), Real-time game service (delay 50ms), the AM mode can not meet the real-time requirements, but in the UM mode, because there is no RLC layer retransmission function, the packet loss rate of the service will increase, and the current evaluation criteria of the voice service are lost. The packet rate is a factor that seriously affects the voice quality. Therefore, the current two transmission modes of the RLC layer cannot simultaneously take into account the service packet loss rate and delay requirements.
  • voice service time delay of 100 ms
  • Real-time game service delay 50ms
  • the embodiment of the invention provides a method and a device for retransmitting a data packet, so as to at least solve the technical problem that the transmission mode in the related art cannot balance the service packet loss rate and the delay requirement.
  • a method for retransmitting a data packet includes: buffering a data packet transmitted to a user equipment UE; and receiving a medium access control MAC layer to transmit the data packet to the UE Feedback: if the transmission feedback indicates that the data packet transmission fails, the buffered data packet is re-issued to the MAC layer for transmission. Transfer scheduling.
  • the method before receiving, by the MAC layer, the transmission feedback of the data packet to the UE, the method further includes: the MAC layer performs transmission scheduling on the data packet; and the MAC layer acquires the data packet. Performing scheduling feedback of the transmission scheduling, and transmitting the transmission feedback according to the scheduling feedback.
  • the MAC layer acquires scheduling feedback for performing transmission scheduling on the data packet, and sends the transmission feedback according to the scheduling feedback, where the MAC layer determines that the data packet is scheduled for transmission. Before the number of times reaches the preset maximum number of transmissions, there is a scheduling feedback corresponding to the transmission scheduling as an acknowledgment response ACK, and the transmission is set to indicate the transmission feedback that the data packet transmission is successful, otherwise the transmission is set to indicate the data packet transmission. The transmission feedback of the failure.
  • buffering the data packet transmitted to the UE includes: buffering the data packet in a buffer of the radio link control RLC layer.
  • buffering the data packet transmitted to the UE includes: receiving a data packet transmitted to the UE; determining whether the data packet is transmitted to the UE for the first time; if yes, buffering the data packet.
  • the buffering the data packet transmitted to the UE includes: determining whether the buffered data packet is equal to a preset maximum number of buffers; if yes, clearing the data packet with the longest cache time or the data packet with the highest number of retransmission times, and The data packet transmitted to the UE is buffered.
  • the method further includes: directly buffering the data packet transmitted to the UE.
  • the method further includes: adding 1 to the number of retransmissions of the data packet; determining the number of retransmission times of the buffered data packet. Whether it is equal to the preset maximum number of retransmissions; if so, clear the cached packet.
  • the method further includes: retaining the cached data packet.
  • the method further includes: if the transmission feedback indicates that the data packet is successfully transmitted, clearing the buffered data packet.
  • a retransmission apparatus for a data packet including: a caching module configured to buffer a data packet transmitted to a user equipment UE; and a receiving module configured to receive a medium access control MAC layer pair And transmitting, by the UE, the transmission feedback of the data packet, where the sending module is configured to re-deliver the buffered data packet to the MAC layer if the transmission feedback indicates that the data packet transmission fails Perform transmission scheduling.
  • the cache module is located in a radio link control RLC layer.
  • a data packet transmitted to the UE is buffered; a transmission feedback of the MAC layer is transmitted to the UE, and if the transmission feedback indicates that the data packet transmission fails, the cached device is cached.
  • the method of retransmitting the data packet to the MAC layer for transmission scheduling, and solving the problem that the transmission mode in the related art cannot balance the service packet loss The technical problem of rate and delay requirements is compared with the feedback result of the AM mode waiting for the UE in the related art to determine whether to retransmit, the decision efficiency of retransmission is greatly improved, and the requirement for delay is more easily satisfied, and compared with UM in related technologies
  • the scheme of not retransmitting the mode also improves the transmission success rate and reduces the service packet loss rate.
  • FIG. 1 is a flowchart of a method for retransmitting a data packet according to an embodiment of the present invention
  • FIG. 2 is a structural block diagram of a retransmission apparatus of a data packet according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a scheduler according to a preferred embodiment of the present invention.
  • FIG. 4 is a flow diagram of fast retransmission in accordance with a preferred embodiment of the present invention.
  • FIG. 1 is a flowchart of a method for retransmitting a data packet according to an embodiment of the present invention. As shown in FIG. 1, the method includes the following steps:
  • Step S102 buffering a data packet transmitted to a user equipment (UE);
  • Step S104 Receive transmission feedback that the medium access control (MAC) layer transmits the data packet to the UE.
  • MAC medium access control
  • Step S106 If the transmission feedback indicates that the data packet transmission fails, the buffered data packet is re-issued to the MAC layer for transmission scheduling.
  • the data packet transmitted to the UE is buffered by the foregoing steps, and the transmission feedback of the data packet transmitted by the MAC layer to the UE is received; if the transmission feedback indicates that the data packet transmission fails, the cached device is cached.
  • the data packet is re-delivered to the MAC layer for transmission scheduling, so that the retransmission can be determined according to the transmission feedback of the MAC layer, and the technology that the transmission mode in the related art cannot balance the service packet loss rate and the delay requirement is solved.
  • the problem is that, compared with the feedback result of the AM mode waiting for the UE in the related art, whether the retransmission is determined, the decision efficiency of the retransmission is greatly improved, the requirement for the delay is more easily satisfied, and the scheme of the UM mode is not retransmitted compared to the related art. It also improves the transmission success rate and reduces the service packet loss rate.
  • the transmission feedback sent by the MAC layer may be obtained by: the MAC layer performing transmission scheduling on the data packet; and the MAC layer acquiring scheduling feedback for performing transmission scheduling on the data packet, and according to The scheduling feedback sends the transmission feedback.
  • the MAC layer acquires scheduling feedback for performing transmission scheduling on the data packet, and sends the scheduling feedback according to the scheduling
  • the sending the feedback may be specifically as follows: the MAC layer determines that before the number of transmission scheduling of the data packet reaches a preset maximum transmission number, if there is a scheduling response corresponding to the transmission scheduling, the acknowledgment response ACK, the sending setting
  • the transmission feedback indicating that the data packet is successfully transmitted, otherwise (that is, before the number of transmission scheduling of the data packet reaches a preset maximum transmission number, there is no scheduling feedback corresponding to the transmission scheduling as an acknowledgement response ACK , in the case of NACK, transmits the transmission feedback set to indicate that the packet transmission failed.
  • the data packet may be buffered in a buffer of a Radio Link Control (RLC) layer.
  • RLC Radio Link Control
  • the data packet that is buffered in the step S102 is usually the first time to be transmitted to the UE, and the specific operation manner is as follows: in step S102, the data packet transmitted to the UE is first received; and whether the data packet is the first time is determined. Transmitting to the UE; if so, caching the data packet, if not, discarding or possibly re-buffering the data packet according to a policy.
  • the maximum number of data packets that are buffered and transmitted to the UE may be set.
  • the data packet transmitted to the UE it may be determined whether the buffered data packet is equal to a preset maximum number of caches; if yes, clear the cache.
  • the packet with the longest time, or the packet with the highest number of retransmissions, or the like, may be cleared, and the packet transmitted to the UE may be buffered.
  • the data packet transmitted to the UE may be directly buffered.
  • the maximum number of retransmissions of the buffered data packet may be set. After the buffered data packet is re-delivered to the MAC layer for transmission scheduling, the number of retransmissions of the data packet may also be increased. 1; determining whether the number of retransmissions of the buffered data packet is equal to a preset maximum number of retransmissions; if so, clearing the cached data packet. In the case of determining whether the number of times of retransmission of the buffered data packet is equal to the maximum number of preset retransmission times, the cached data packet may also be retained.
  • the buffered data packet may be cleared.
  • a retransmission device for a data packet is further provided in the embodiment, and the device is configured to implement the foregoing embodiments and preferred embodiments, and details are not described herein.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • FIG. 2 is a structural block diagram of a retransmission device of a data packet according to an embodiment of the present invention. As shown in FIG. 2, the device includes: a cache module 22, a receiving module 24, and a sending module 26. The following describes each module in detail. :
  • the cache module 22 is configured to buffer a data packet transmitted to the user equipment (UE); the receiving module 24 is connected to the cache module 22, and is configured to receive a medium access control (MAC) layer to transmit the data packet to the UE. And the sending module 26 is connected to the cache module 22 and the receiving module 24, and is configured to re-send the cached data packet to the MAC if the transmission feedback indicates that the data packet transmission fails.
  • the layer performs transmission scheduling.
  • the cache module 22 can be located at a radio link control (RLC) layer.
  • RLC radio link control
  • the RLC layer is used. For example, a fast retransmission scheme between the AM mode and the UM mode is provided.
  • the MAC layer schedules the feedback of the data packet, and the RLC layer performs fast retransmission without relying on the UE reporting feedback to compensate.
  • the RLC layer has the defect that the transmission mode has a large retransmission delay, and takes into consideration the requirements of the PDB delay and the PER packet loss rate of the service packet data packet.
  • the method and device for fast retransmission provided by the preferred embodiment are applied to a mobile communication network, and the method mainly includes: determining a data packet buffer buffer, and re-reading the data packet that fails to be transmitted in the cache buffer according to the scheduling feedback of the MAC layer.
  • the data packet is sent to the MAC layer for fast retransmission, and no longer depends on the reporting feedback of the UE, which compensates for the defect of the retransmission delay of the existing transmission mode of the RLC layer, and takes into account the PDB delay and the PER loss of the service packet data packet.
  • Package rate requirements are applied to a mobile communication network, and the method mainly includes: determining a data packet buffer buffer, and re-reading the data packet that fails to be transmitted in the cache buffer according to the scheduling feedback of the MAC layer.
  • the data packet is sent to the MAC layer for fast retransmission, and no longer depends on the reporting feedback of the UE, which compensates for the defect of the retransmission delay of the existing transmission mode of the
  • the UE initially accesses the base station, and puts a buffer buffer for each data packet scheduled by the UE. If the scheduling module schedules the data packet successfully, the buffer buffer is notified to clear the data packet; if the scheduling module fails to schedule the data packet, Then, the data packet is read from the buffer buffer and sent to the scheduling module for scheduling, and the data packet is quickly retransmitted by using the buffer buffer.
  • the scheduling module defines a maximum number of transmissions for each data packet. Each time the scheduling module transmits the data packet, the number of transmissions is increased by one. If the maximum number of transmissions is reached, the transmission scheduling feedback of the data packet is ACK. The packet is considered to be successfully scheduled. Otherwise, if the maximum number of transmissions is reached, and the scheduling feedback received by transmitting the data packet is NACK, the packet scheduling failure is considered.
  • the scheduling module After the buffer is resent to the scheduling module, the scheduling module starts to retransmit the data packet starting from the number of transmissions.
  • the upper limit of the number of cache buffer packets can be specified. If the number of cached packets in the buffer buffer is already the upper limit, when there is a new data packet to be cached, the cache time in the cache buffer is cleared. The longest packet or the most transmitted packet.
  • the number of times that each data packet is retransmitted in the buffer buffer can be specified, and the data packet in the buffer buffer is re-issued to the scheduling module for scheduling, and the retransmission is performed.
  • the number of times is increased by 1. If the number of retransmissions reaches the upper limit of the number of retransmissions, the packet directly clears the packet from the buffer buffer.
  • the packet maintenance in the buffer buffer is maintained separately at the UE level.
  • the scheduler includes a buffer.
  • the cache may be located at the RLC layer, and the data packet is cached for fast weight.
  • the scheduler also includes a scheduling module, located at the MAC layer, configured to schedule data packets and provide feedback to the buffer.
  • FIG. 4 is a flow diagram of fast retransmission for a scheduler as shown in FIG. 3 in accordance with a preferred embodiment of the present invention.
  • Reference 4 the technical solution adopted by the preferred embodiment is as follows:
  • Step S402 determining an upper limit of the number of data packets that the data packet buffer Buffer can buffer, and an upper limit of the number of retransmissions of each data packet in the buffer Buffer.
  • Step S404 placing each scheduled data packet into a buffer Buffer.
  • Step S406 it is judged whether the data packet buffered in the data packet buffer Buffer reaches the upper limit, and if yes, the process proceeds to step S408, otherwise, the process proceeds to step S410.
  • Step S408 if the data packet buffered in the buffer Buffer has exceeded the upper limit, the data packet with the longest cache time or the most (maximum) data packet is cleared, and the number of buffer buffer data packets is updated.
  • Step S410 If the data packet buffered in the buffer Buffer does not exceed the upper limit, the scheduled data packet is placed in the buffer buffer.
  • step S412 it is determined whether the scheduling module is successfully scheduled. If successful, the process proceeds to step S420, and if it fails, the process proceeds to step S414.
  • step S414 if the data packet fails to be scheduled, the data packet is read from the buffer buffer and sent to the scheduling module for scheduling.
  • step S416 the number of retransmissions of the data packet is increased by one.
  • step S4108 it is determined whether the number of retransmissions of the data packet in the buffer buffer reaches the upper limit of the number of retransmissions. If yes, the process proceeds to step S420, otherwise, the process proceeds to step S422.
  • Step S420 clearing the data packet stored in the buffer buffer, and updating the number of buffer buffer data packets.
  • Step S422 continuing to cache the data packet.
  • Step S424 the scheduling module reschedules the data packet that failed to be transmitted according to the scheduling policy.
  • the preferred embodiment proposes a fast retransmission method and device, which compensates for the defect of the retransmission delay of the existing transmission mode of the RLC layer, and takes into account the PDB of the service packet data packet. Extend the PER packet loss rate requirement to maximize the Qos attribute requirements of the service.
  • Step S502 Determine that the maximum number of data packets of the data packet buffer is infinity, and determine that the maximum number of retransmissions of each data packet in the buffer buffer is Infinity.
  • Step S506 Determine the upper limit of the data packet in the buffer buffer: the upper limit is Infinity, and the cache buffer stores the data packet Data1.
  • Step S508 The scheduling module schedules the data packet Data1 to be successfully scheduled, and notifies the buffer buffer to clear the data packet Data1.
  • Step S510 The data packet Data2 is scheduled at time T2, and the data packet is delivered to the buffer buffer.
  • Step S512 determining the number of data packets in the buffer buffer: the upper limit is Infinity, and the cache buffer stores the data packet Data2.
  • Step S514 If the scheduling module schedules the data packet Data2 to fail to schedule, the buffer buffer is notified to retransmit the data packet Data2, and the process proceeds to steps S516 and S518. If the scheduling module schedules the data packet Data2 to be successfully scheduled, the buffer buffer is notified to clear the data packet Data2.
  • Step S516 The buffer buffer reads the data packet Data2, the number of retransmissions of the data packet Data2 is increased by 1, and the number of retransmissions is 1.
  • Step S518 judging the number of retransmissions of the data packet: the upper limit is Infinity, and the data packet Data2 continues to be cached.
  • Step S520 If the scheduling module schedules a new data packet, steps S510-S518 are repeated.
  • Step S602 determining that the maximum number of data packets of the data packet buffer is 5, and determining that the maximum number of retransmissions of each data packet in the buffer buffer is 1.
  • Step S606 Determine the upper limit of the data packet in the buffer buffer: the upper limit is 5, the number of stored buffer packets is 4, the buffer buffer stores the data packet Data1, the cache buffer stores the number of data packets plus 1, and the number of stored data packets is 5.
  • Step S608 The scheduling module schedules the data packet Data1 to fail to schedule, and notifies the buffer buffer to retransmit the data packet Data1.
  • Step S610 The buffer buffer reads the data packet Data1, the number of retransmissions of the data packet Data1 is increased by 1, and the number of retransmissions is 1.
  • Step S612 determining the number of retransmissions of the data packet: the upper limit is 1, the number of retransmissions is greater than or equal to the upper limit, and the data packet Data1 is cleared.
  • Step S616 The data packet Data2 is scheduled at time T2, and the data packet is delivered to the buffer buffer.
  • Step S618 determining the upper limit of the data packet in the buffer buffer: the upper limit is 5, the number of stored buffer packets is 4, the buffer buffer stores the data packet Data2, the cache buffer stores the number of data packets plus 1, and the number of stored data packets is 5.
  • Step S620 The data packet Data3 is scheduled at the time T3, and the data packet is delivered to the buffer buffer.
  • Step S622 determining the upper limit of the data packet in the buffer buffer: the upper limit is 5, the number of stored data packets of the buffer buffer is 5, the buffer buffer clears the data packet Datax with the longest cache time, and the cache buffer stores the data packet Data2.
  • Step S624 If the scheduling module schedules a new data packet, the above steps are repeated.
  • a software is provided that is configured to perform the technical solutions described in the above embodiments and preferred embodiments.
  • a storage medium in which the above software is stored, including but not limited to an optical disk, a floppy disk, a hard disk, an erasable memory, and the like.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the method and device for retransmitting a data packet provided by the embodiment of the present invention have the following beneficial effects: solving the technical problem that the transmission mode in the related art cannot balance the service packet loss rate and the delay requirement,
  • the AM mode waits for the feedback result of the UE to determine whether to retransmit, the efficiency of the retransmission is greatly improved, and the requirement for delay is more easily satisfied, and the scheme of not retransmitting the UM mode in the related art is also improved.
  • the transmission success rate reduces the service packet loss rate.

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Abstract

本发明公开了一种数据包的重传方法及装置，其中，该方法包括：缓存向UE传输的数据包；接收MAC层对向所述UE传输所述数据包的传输反馈；如果所述传输反馈指示所述数据包传输失败，则将缓存的所述数据包重新下发给所述MAC层进行传输调度。通过本发明，解决了相关技术中的传输模式无法兼顾业务丢包率和时延要求的技术问题，相比相关技术中AM模式等待UE的反馈结果确定是否重传，重传的判定效率大大提高，更加容易满足针对时延的要求，并且相比相关技术中UM模式不进行重传的方案，也提升了传输成功率，降低了业务丢包率。

Description

数据包的重传方法及装置 技术领域
本发明涉及通信领域，具体而言，涉及一种数据包的重传方法及装置。
背景技术
在当前第三代合作伙伴计划(3rd Generation Partnership Project，简称为3GPP)协议中将业务按照不同的属性划分为不同的种类，每类业务用一种服务质量(Quality of service，简称为Qos)等级标识(Qos Class Identifier，简称为QCI)索引表示。目前协议给出的9类QCI业务，每类QCI业务都明确规定了业务数据包的时延(Packet Delay Budget，简称为PDB)，表示分组数据包在手持终端(也称用户设备，User Equipment，简称为UE)与核心网间传输的最大时延，协议明确规定任何业务98％的数据包都应该满足时延要求，因此为了保证分组数据包的有效性，该值是基站调度器的重要考量参数之一。
除了规定业务数据包的时延外，协议还规定了每种QCI业务的丢包率(Packet Error Loss Rate，简称为PER)：表示无线链路层除了拥塞原因外的分组数据包丢失率，也就是除了拥塞原因外，发送端的无线链路控制(Radio Link Control，简称为RLC)层已经发送但是接收端RLC层没有成功收到数据包所占的比例的上限。为了满足不同QCI业务的丢包率，RLC层有非确认模式(Unacknowledged Mode，简称为UM)和确认模式(Acknowledged Mode，简称为AM)两种模式传输数据。对于AM模式，RLC层对发送的数据有重传功能，而UM模式，RLC层没有重传功能。带有重传功能的AM模式需要根据UE的上报反馈来进行重传，这样数据包的传输时延就会增大，对于一些时延要求高的业务，例如：语音业务(时延100ms)，实时游戏业务(时延50ms)，AM模式无法满足实时性要求，但是使用UM模式，由于没有RLC层重传功能，业务的丢包率又会增大，而目前语音业务的评估准则中，丢包率是严重影响语音质量的一个因素，因此目前RLC层的两种传输模式不能同时兼顾业务丢包率和时延的要求。
针对相关技术中的传输模式无法兼顾业务丢包率和时延要求的问题，目前尚无有效的解决方案。
发明内容
本发明实施例提供了一种数据包的重传方法及装置，以至少解决相关技术中的传输模式无法兼顾业务丢包率和时延要求的技术问题。
根据本发明的一个实施例，提供了一种数据包的重传方法，包括：缓存向用户设备UE传输的数据包；接收媒体接入控制MAC层对向所述UE传输所述数据包的传输反馈；如果所述传输反馈指示所述数据包传输失败，则将缓存的所述数据包重新下发给所述MAC层进行传 输调度。
本实施例中，在接收MAC层对向所述UE传输所述数据包的传输反馈之前，还包括：所述MAC层对所述数据包进行传输调度；所述MAC层获取对所述数据包进行传输调度的调度反馈，并根据所述调度反馈发送所述传输反馈。
本实施例中，所述MAC层获取对所述数据包进行传输调度的调度反馈，并根据所述调度反馈发送所述传输反馈包括：所述MAC层确定在对所述数据包进行传输调度的次数达到预设的最大传输次数之前，存在一次传输调度对应的调度反馈为确认响应ACK，则发送设置为指示所述数据包传输成功的所述传输反馈，否则发送设置为指示所述数据包传输失败的所述传输反馈。
本实施例中，缓存向UE传输的数据包包括：在无线链路控制RLC层的缓存器中缓存所述数据包。
本实施例中，缓存向UE传输的数据包包括：接收向所述UE传输的数据包；判断所述数据包是否为首次向所述UE传输；如果是，则缓存所述数据包。
本实施例中，缓存向UE传输的数据包包括：判断已经缓存的数据包是否等于预设的缓存最大数量；如果是，清除缓存时间最长的数据包或者重传次数最多的数据包，并缓存所述向UE传输的数据包。
本实施例中，在判断已经缓存的数据包是否等于预设的缓存最大数量的结果为否的情况下，还包括：直接缓存所述向UE传输的数据包。
本实施例中，在将缓存的所述数据包重新下发给MAC层进行传输调度之后，还包括：将所述数据包的重传次数加1；判断缓存的所述数据包的重传次数是否等于预设的重传最大次数；如果是，清除缓存的所述数据包。
本实施例中，在判断缓存的所述数据包的重传次数是否等于预设的重传最大次数的结果为否的情况下，还包括：保留缓存的所述数据包。
本实施例中，在接收MAC层对向所述UE传输所述数据包的传输反馈之后，还包括：如果所述传输反馈指示所述数据包传输成功，则清除缓存的所述数据包。
根据本发明的另一实施例，提供了一种数据包的重传装置，包括：缓存模块，设置为缓存向用户设备UE传输的数据包；接收模块，设置为接收媒体接入控制MAC层对向所述UE传输所述数据包的传输反馈；下发模块，设置为在所述传输反馈指示所述数据包传输失败的情况下，将缓存的所述数据包重新下发给所述MAC层进行传输调度。
本实施例中，所述缓存模块位于无线链路控制RLC层。
通过本发明实施例，采用缓存向UE传输的数据包；接收MAC层对向所述UE传输所述数据包的传输反馈；如果所述传输反馈指示所述数据包传输失败，则将缓存的所述数据包重新下发给所述MAC层进行传输调度的方式，解决了相关技术中的传输模式无法兼顾业务丢包 率和时延要求的技术问题，相比相关技术中AM模式等待UE的反馈结果确定是否重传，重传的判定效率大大提高，更加容易满足针对时延的要求，并且相比相关技术中UM模式不进行重传的方案，也提升了传输成功率，降低了业务丢包率。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1是根据本发明实施例的数据包的重传方法的流程图；
图2是根据本发明实施例的数据包的重传装置的结构框图；
图3是根据本发明优选实施例的调度器的结构示意图；
图4是根据本发明优选实施例的快速重传的流程图。
具体实施方式
下文中将参考附图并结合实施例来详细说明本发明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
在本实施例中，提供了一种数据包的重传方法，图1是根据本发明实施例的数据包的重传方法的流程图，如图1所示，该方法包括如下步骤：
步骤S102，缓存向用户设备(UE)传输的数据包；
步骤S104，接收媒体接入控制(MAC)层对向所述UE传输所述数据包的传输反馈；
步骤S106，如果所述传输反馈指示所述数据包传输失败，则将缓存的所述数据包重新下发给所述MAC层进行传输调度。
本实施例通过上述步骤，缓存向UE传输的数据包；接收MAC层对向所述UE传输所述数据包的传输反馈；如果所述传输反馈指示所述数据包传输失败，则将缓存的所述数据包重新下发给所述MAC层进行传输调度，从而根据MAC层的传输反馈即可确定是否进行重传，解决了相关技术中的传输模式无法兼顾业务丢包率和时延要求的技术问题，相比相关技术中AM模式等待UE的反馈结果确定是否重传，重传的判定效率大大提高，更加容易满足针对时延的要求，并且相比相关技术中UM模式不进行重传的方案，也提升了传输成功率，降低了业务丢包率。
在本实施例中，MAC层发送的传输反馈可以通过以下方式获得：所述MAC层对所述数据包进行传输调度；所述MAC层获取对所述数据包进行传输调度的调度反馈，并根据所述调度反馈发送所述传输反馈。
其中，所述MAC层获取对所述数据包进行传输调度的调度反馈，并根据所述调度反馈发 送所述传输反馈可以具体如下：所述MAC层确定在对所述数据包进行传输调度的次数达到预设的最大传输次数之前，存在一次传输调度对应的调度反馈为确认响应ACK，则发送设置为指示所述数据包传输成功的所述传输反馈，否则(也即在对所述数据包进行传输调度的次数达到预设的最大传输次数之前，不存在传输调度对应的调度反馈为确认响应ACK，均为NACK的情况)发送设置为指示所述数据包传输失败的所述传输反馈。
本实施例中，可以在无线链路控制(RLC)层的缓存器中缓存所述数据包。
在本实施例中，步骤S102中缓存的通常是首次向UE传输的数据包，具体操作方式如下：在步骤S102中，首先接收向所述UE传输的数据包；判断所述数据包是否为首次向所述UE传输；如果是，则缓存所述数据包，如果否，则可以根据策略丢弃或也可以重新缓存所述数据包。
在本实施例中，可以设置缓存向UE传输的数据包的最大数量，在缓存向UE传输的数据包时，可以判断已经缓存的数据包是否等于预设的缓存最大数量；如果是，清除缓存时间最长的数据包，或者也可以清除重传次数最多的数据包等，并缓存所述向UE传输的数据包。而在判断已经缓存的数据包是否等于预设的缓存最大数量的结果为否的情况下，则可以直接缓存所述向UE传输的数据包。
本实施例中，还可以设置缓存的该数据包的重传最大次数，在将缓存的所述数据包重新下发给MAC层进行传输调度之后，还可以将所述数据包的重传次数加1；判断缓存的所述数据包的重传次数是否等于预设的重传最大次数；如果是，清除缓存的所述数据包。而在判断缓存的所述数据包的重传次数是否等于预设的重传最大次数的结果为否的情况下，还可以保留缓存的所述数据包。
本实施例中，如果所述传输反馈指示所述数据包传输成功，则可以清除缓存的所述数据包。
对应于上述方法，在本实施例中还提供了一种数据包的重传装置，该装置设置为实现上述实施例及优选实施方式，已经进行过说明的不再赘述。如以下所使用的，术语“模块”可以实现预定功能的软件和/或硬件的组合。尽管以下实施例所描述的装置较佳地以软件来实现，但是硬件，或者软件和硬件的组合的实现也是可能并被构想的。
图2是根据本发明实施例的数据包的重传装置的结构框图，如图2所示，该装置包括：缓存模块22、接收模块24和下发模块26，下面对各个模块进行详细说明：
缓存模块22，设置为缓存向用户设备(UE)传输的数据包；接收模块24，与缓存模块22相连，设置为接收媒体接入控制(MAC)层对向所述UE传输所述数据包的传输反馈；下发模块26，与缓存模块22和接收模块24相连，设置为在所述传输反馈指示所述数据包传输失败的情况下，将缓存的所述数据包重新下发给所述MAC层进行传输调度。
其中，所述缓存模块22可以位于无线链路控制(RLC)层。
为了更好地理解上述实施例，以下结合优选实施例详细说明，以下的优选实施例结合了上述实施例及其优选实施方式。
目前相关技术中仅存在上文提到的AM模式以及UM模式的传输模式方案，而这两种传输模式方案无法兼顾业务丢包率和时延要求，因此，本优选实施例中以RLC层为例进行说明，提供了一种介于AM模式和UM模式之间的快速重传的方案，通过MAC层调度数据包的反馈，RLC层进行快速重传，而不依赖于UE的上报反馈，弥补RLC层现有传输模式重传时延大的缺陷，兼顾业务分组数据包的PDB时延和PER丢包率的要求。
本优选实施例提供的快速重传的方法和装置应用在移动通信网络中，主要包括：确定一个数据包缓存buffer，根据MAC层的调度反馈，对于传输失败的数据包，在缓存buffer里面重新读取该数据包下发给MAC层，进行快速重传，不再依赖UE的上报反馈，弥补RLC层现有传输模式重传时延大的缺陷，兼顾业务分组数据包的PDB时延和PER丢包率的要求。
本优选从UE接入基站初始，对于UE每次调度的数据包，放入缓存buffer，如果调度模块调度该数据包成功，则通知缓存buffer清除该数据包；如果调度模块调度该数据包失败，则从缓存buffer中读取该数据包重新下发给调度模块进行调度，借助缓存buffer对该数据包进行快速重传。
调度模块对每个数据包会定义一个最大传输次数，调度模块每传输一次该数据包，则传输次数加1，如果在达到最大传输次数前，某次传输收到该数据包调度反馈为ACK，则认为该数据包调度成功，否则如果达到最大传输次数，传输该数据包收到的调度反馈都为NACK，则认为该数据包调度失败。
对于调度失败的数据包，缓存buffer重新下发给调度模块后，调度模块会从传输次数1开始，重新对该数据包进行传输。
考虑到缓存buffer的存储空间，可以规定缓存buffer缓存数据包的数目上限如果缓存buffer中缓存数据包的数目已经为数目上限，当再有新数据包需要缓存的时候，清除在缓存buffer中缓存时间最长的数据包或者传输次数最多的数据包。
考虑到缓存buffer的存储空间和数据包的调度时延，可以规定每个数据包在缓存buffer重传的次数，缓存buffer中的数据包每次被重新下发给调度模块进行调度，其重传次数就会加1，如果重传次数达到重传次数上限，则该数据包直接从缓存buffer中清除该数据包。
缓存buffer中的数据包维护以UE级分别维护。
下面参照附图3和4详细说明本优选实施例提供的快速重传的方法和装置。
图3是根据本发明优选实施例的调度器的结构示意图，如图3所示，该调度器中包括一缓存(Buffer)，优选地该缓存可以位于RLC层，缓存数据包以用于快速重传；调度器中还包括一调度模块，位于MAC层，设置为调度数据包，并给缓存(Buffer)提供反馈。
图4是根据本发明优选实施例的快速重传的流程图，应用于如图3所示的调度器。参照 图4，本优选实施例采用的技术方案流程如下：
步骤S402，确定数据包缓存Buffer可以缓存的数据包数上限，以及每个数据包在缓存Buffer中进行重传次数的上限。
步骤S404，将每个调度的数据包，放入缓存Buffer。
步骤S406，判断数据包缓存Buffer中缓存的数据包是否达到上限，如果是，则进入步骤S408，否则进入步骤S410。
步骤S408，如果缓存Buffer中缓存的数据包已经超过上限，则清除缓存时间最长的数据包或传输次数最多(最大)的数据包，更新缓存buffer数据包数。
步骤S410，如果缓存Buffer中缓存的数据包未超过上限，则将调度的数据包放入缓存buffer。
步骤S412，判断调度模块是否调度成功，如果成功则进入步骤S420，如果失败则进入步骤S414。
步骤S414，如果调度该数据包失败，则从缓存buffer中读取该数据包重新下发给调度模块进行调度。
步骤S416，将该数据包的重传次数加1。
步骤S418，判断数据包在缓存buffer中的重传次数是否达到重传次数上限，如果是则进入步骤S420，否则进入步骤S422。
步骤S420，将缓存buffer中存储的该数据包清掉，更新缓存buffer数据包数。
步骤S422，继续缓存该数据包。
步骤S424，调度模块，根据调度策略，将传输失败的数据包重新调度。
本优选实施例可以获得如下益处：
本优选实施例为了减少RLC层的重传时延，提出了一种快速重传的方法和装置，弥补了RLC层现有传输模式重传时延大的缺陷，兼顾业务分组数据包的PDB时延和PER丢包率的要求，最大化保证业务的Qos属性要求。
下面通过具体的实施例来说明。
实施例1：
步骤S502：确定数据包缓存buffer的数据包数上限为无限大(Infinity)，确定每个数据包在缓存buffer中的重传次数上限为无限大(Infinity)。
步骤S504：UE Index＝10的UE初始接入，T1时刻调度数据包Data1，将该数据包传递给缓存buffer。
步骤S506：判断缓存buffer中数据包上限：上限为Infinity，缓存buffer存储数据包Data1。
步骤S508：调度模块调度数据包Data1调度成功，通知缓存buffer清除数据包Data1。
步骤S510：T2时刻调度数据包Data2，将该数据包传递给缓存buffer。
步骤S512：判断缓存buffer中数据包数目：上限为Infinity，缓存buffer存储数据包Data2。
步骤S514：如果调度模块调度数据包Data2调度失败，通知缓存buffer重传数据包Data2，进入步骤S516和S518；如果调度模块调度数据包Data2调度成功，通知缓存buffer清除数据包Data2。
步骤S516：缓存buffer读取数据包Data2，数据包Data2的重传次数加1，重传次数为1。
步骤S518：判断数据包重传次数：上限为Infinity，数据包Data2继续缓存。
步骤S520：如果调度模块调度新的数据包，则重复步骤S510-S518。
注意：如果数据包缓存buffer的数据包数上限为Infinity，则删除数据包后不需要更新缓存buffer的数据包数。
实施例2：
步骤S602：确定数据包缓存buffer的数据包数上限为5，确定每个数据包在缓存buffer中的重传次数上限为1。
步骤S604：UE Index＝10的UE初始接入，T1时刻调度数据包Data1，将该数据包传递给缓存buffer。
步骤S606：判断缓存buffer中数据包上限：上限为5，缓存buffer已存储数据包数为4，缓存buffer存储数据包Data1，缓存buffer存储数据包数加1，已存储数据包数为5。
步骤S608：调度模块调度数据包Data1调度失败，通知缓存buffer重传数据包Data1。
步骤S610：缓存buffer读取数据包Data1，数据包Data1的重传次数加1，重传次数为1。
步骤S612：判断数据包重传次数：上限为1，重传次数大于等于上限，清除数据包Data1。
步骤S614：更新缓存buffer数据包数：5-1＝4。
步骤S616：T2时刻调度数据包Data2，将该数据包传递给缓存buffer。
步骤S618：判断缓存buffer中数据包上限：上限为5，缓存buffer已存储数据包数为4，缓存buffer存储数据包Data2，缓存buffer存储数据包数加1，已存储数据包数为5。
步骤S620：T3时刻调度数据包Data3，将该数据包传递给缓存buffer。
步骤S622：判断缓存buffer中数据包上限：上限为5，缓存buffer已存储数据包数为5，缓存buffer清除缓存时间最长的数据包Datax，缓存buffer存储数据包Data2。
步骤S624：如果调度模块调度新的数据包，则重复上述步骤。
在另外一个实施例中，还提供了一种软件，该软件设置为执行上述实施例及优选实施例中描述的技术方案。
在另外一个实施例中，还提供了一种存储介质，该存储介质中存储有上述软件，该存储介质包括但不限于光盘、软盘、硬盘、可擦写存储器等。
显然，本领域的技术人员应该明白，上述的本发明的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，并且在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
工业实用性
如上所述，本发明实施例提供的一种数据包的重传方法及装置，具有以下有益效果：解决了相关技术中的传输模式无法兼顾业务丢包率和时延要求的技术问题，相比相关技术中AM模式等待UE的反馈结果确定是否重传，重传的判定效率大大提高，更加容易满足针对时延的要求，并且相比相关技术中UM模式不进行重传的方案，也提升了传输成功率，降低了业务丢包率。

Claims (12)

  1. 一种数据包的重传方法，包括：
    缓存向用户设备UE传输的数据包；
    接收媒体接入控制MAC层对向所述UE传输所述数据包的传输反馈；
    如果所述传输反馈指示所述数据包传输失败，则将缓存的所述数据包重新下发给所述MAC层进行传输调度。
  2. 根据权利要求1所述的方法，其中，在接收MAC层对向所述UE传输所述数据包的传输反馈之前，还包括：
    所述MAC层对所述数据包进行传输调度；
    所述MAC层获取对所述数据包进行传输调度的调度反馈，并根据所述调度反馈发送所述传输反馈。
  3. 根据权利要求2所述的方法，其中，所述MAC层获取对所述数据包进行传输调度的调度反馈，并根据所述调度反馈发送所述传输反馈包括：
    所述MAC层确定在对所述数据包进行传输调度的次数达到预设的最大传输次数之前，存在一次传输调度对应的调度反馈为确认响应ACK，则发送设置为指示所述数据包传输成功的所述传输反馈，否则发送设置为指示所述数据包传输失败的所述传输反馈。
  4. 根据权利要求1至3中任一项所述的方法，其中，缓存向UE传输的数据包包括：
    在无线链路控制RLC层的缓存器中缓存所述数据包。
  5. 根据权利要求1至3中任一项所述的方法，其中，缓存向UE传输的数据包包括：
    接收向所述UE传输的数据包；
    判断所述数据包是否为首次向所述UE传输；
    如果是，则缓存所述数据包。
  6. 根据权利要求1至3中任一项所述的方法，其中，缓存向UE传输的数据包包括：
    判断已经缓存的数据包是否等于预设的缓存最大数量；
    如果是，清除缓存时间最长的数据包或者重传次数最多的数据包，并缓存所述向UE传输的数据包。
  7. 根据权利要求6所述的方法，其中，在判断已经缓存的数据包是否等于预设的缓存最大数量的结果为否的情况下，还包括：
    直接缓存所述向UE传输的数据包。
  8. 根据权利要求1至3中任一项所述的方法，其中，在将缓存的所述数据包重新下发给MAC层进行传输调度之后，还包括：
    将所述数据包的重传次数加1；
    判断缓存的所述数据包的重传次数是否等于预设的重传最大次数；
    如果是，清除缓存的所述数据包。
  9. 根据权利要求8所述的方法，其中，在判断缓存的所述数据包的重传次数是否等于预设的重传最大次数的结果为否的情况下，还包括：
    保留缓存的所述数据包。
  10. 根据权利要求1至3中任一项所述的方法，其中，在接收MAC层对向所述UE传输所述数据包的传输反馈之后，还包括：
    如果所述传输反馈指示所述数据包传输成功，则清除缓存的所述数据包。
  11. 一种数据包的重传装置，包括：
    缓存模块，设置为缓存向用户设备UE传输的数据包；
    接收模块，设置为接收媒体接入控制MAC层对向所述UE传输所述数据包的传输反馈；
    下发模块，设置为在所述传输反馈指示所述数据包传输失败的情况下，将缓存的所述数据包重新下发给所述MAC层进行传输调度。
  12. 根据权利要求11所述的装置，其中，所述缓存模块位于无线链路控制RLC层。
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