WO2017088696A1 - 一种基于laa的混合自动重传处理方法和基站 - Google Patents

一种基于laa的混合自动重传处理方法和基站 Download PDF

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WO2017088696A1
WO2017088696A1 PCT/CN2016/106271 CN2016106271W WO2017088696A1 WO 2017088696 A1 WO2017088696 A1 WO 2017088696A1 CN 2016106271 W CN2016106271 W CN 2016106271W WO 2017088696 A1 WO2017088696 A1 WO 2017088696A1
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subframe
bbu
data packet
channel state
feedback message
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French (fr)
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胡磊
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华为技术有限公司
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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
    • 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
    • H04L1/1806—Go-back-N protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria

Definitions

  • the present invention relates to the field of communications, and in particular, to a LAA-based hybrid automatic retransmission processing method and a base station.
  • 3GPP 3rd Generation Partnership Project
  • 3GPP 3rd Generation Partnership Project
  • LAA LTE Assisted Access
  • the technical problem to be solved by the embodiments of the present invention is to provide a hybrid automatic retransmission processing method based on LAA.
  • the problem that the LTE system scheduler in the prior art is difficult to adapt to the fast transmission and release of the channel under the LAA can be solved.
  • an embodiment of the present invention provides a LAA-based hybrid automatic retransmission processing method, including:
  • the radio remote unit RRU sends a downlink data packet to the user equipment UE in the subframe N+L according to the scheduling indication of the baseband processing unit BBU in the subframe N;
  • the BBU corrects the first feedback message to a second feedback message
  • the BBU sends the retransmitted data packet to the UE through the RRU in a subframe N+P; wherein N, L, M, and P are integers greater than 0, and L ⁇ M ⁇ P.
  • the acquiring a channel state of the auxiliary access channel in the subframe N+L includes:
  • a second possible implementation manner before acquiring the channel state of the auxiliary access channel in the subframe N+L according to the preset channel state table, Also includes:
  • the BBU records the channel state of the secondary access channel in the currently detected subframe into the channel state table.
  • the number of retransmissions of the retransmitted data packet does not change.
  • a second aspect of the embodiments of the present invention provides a base station, including: an RRU and a BBU;
  • the RRU is configured to send a downlink data packet to the user equipment UE in the subframe N+L according to the scheduling indication of the BBU in the subframe N; and receive, by the N+M, the first returned by the UE according to the downlink data packet. Feedbacking the message and forwarding the first feedback message to the BBU;
  • the BBU is configured to receive the first feedback message in a subframe N+P, and acquire a channel state of the auxiliary access channel in the subframe N+L; if the channel state is unavailable, Narrative a feedback message is modified into a second feedback message; and a retransmitted data packet of the downlink data packet is generated according to the second feedback message; wherein, the NDI of the retransmitted data packet is not reversed and the redundancy version number is unchanged;
  • the subframe N+P sends the retransmitted data packet to the UE through the RRU; wherein, N, L, M, and P are integers greater than 0, and L ⁇ M ⁇ P.
  • the acquiring, by the BBU, the channel status of the auxiliary access channel in the subframe N+L specifically includes:
  • the RRU is further configured to: when the channel state of the auxiliary access channel in one subframe is detected, Notifying the channel state of the auxiliary access channel in the currently detected subframe;
  • the BBU is further configured to record a channel state of the secondary access channel in the currently detected subframe into a channel state table.
  • the number of retransmissions of the retransmitted data packet does not change.
  • a third aspect of the embodiments of the present invention provides a base station, including: one or more processors, a memory, a bus system, a transceiver, and one or more programs, the one or more processors, the memory, and the Transceivers are connected by the bus system;
  • the one or more programs are stored in the memory, the one or more programs comprising instructions that, when executed by the base station, cause the base station to perform the first aspect to the first aspect A method as claimed in any one of the fourth possible implementations.
  • the base station corrects the ACK or NACK fed back by the UE according to the downlink data packet according to the channel state of the secondary access channel, and keeps the NDI and the redundancy version number of the retransmitted data packet unchanged.
  • the automatic retransmission adaptation of the LAA can be performed to ensure that the LTE system can quickly transmit data, maximize the use of channel resources, and increase throughput gain when the auxiliary access channel is available.
  • FIG. 1 is a schematic structural diagram of an LTE communication system according to an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of LAA-based hybrid automatic retransmission according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a hybrid automatic retransmission of an LAA according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • FIG. 1 is a schematic structural diagram of an LTE communication system according to an embodiment of the present invention.
  • an LTE communication system includes a base station 1 and a user equipment 2, and the base station 1 includes a BBU 11 and an RRU 12, and the base station 1 and the user equipment. Data is transmitted between the two through the wireless air interface.
  • the auxiliary access channel may be an unlicensed spectrum channel or a licensed spectrum channel, and the LTE communication system uses the auxiliary access channel for data transmission.
  • CCA Card Before using the auxiliary access channel for transmission, the auxiliary access channel must be subjected to CCA (Clear Channel Assessment, CCA,
  • CCA Card
  • the idle channel assessment (referred to as CCA) can obtain the access right of the auxiliary access channel when the secondary access channel is idle, and transmit data through the auxiliary access channel, that is, LBT (Listen Before Talk, first listen, LBT for short) )mechanism.
  • LBT Listen Before Talk, first listen, LBT for short
  • the base station includes a BBU (Building Base Band Unit, BBU for short) and an RRU (Radio Remote Unit, RRU for short), and the interaction between the BBU and the RRU and the RRU and UE (User Equipment, There is a certain delay between the user equipment and the UE.
  • the BBU schedules the RRU to perform downlink transmission in the subframe N+L in the subframe N.
  • the RRU sends the downlink data packet to the UE through the wireless air interface, and the UE connects.
  • the downlink data packet is decoded. If the decoding succeeds, the acknowledgment feedback message ACK is returned to the base station.
  • the non-acknowledgment feedback message NACK is returned to the base station, and the RRU of the base station receives the subframe N+M.
  • the first feedback message returned by the user equipment, the first feedback message includes a NACK or an ACK, and the BBU receives the feedback message in the subframe N+P due to the delay between the BBU and the RRU, and the BBU acquires the subframe N+L at this time.
  • the channel state of the secondary access channel If the RRU fails to send the downlink data packet in the N+L subframe if the secondary access channel is unavailable in the N+L subframe in which the downlink data packet is transmitted, the RRU is in the subroutine.
  • the first feedback message for the downlink data packet received by the frame N+P is inaccurate, and the first feedback message needs to be modified into a second feedback message, where the second feedback message is used to indicate that the base station sends the downlink data packet in the subframe.
  • the secondary access channel is unavailable.
  • the RRU must acquire the channel state of the auxiliary access channel in the subframe N+L before the subframe N+P, and the method may be: the RRU detects the auxiliary access channel in the subframe N+L. In the information state, the subframe after the N+L subframe reports the detected channel state to the RRU, and the RRU must ensure that the channel state is received before the subframe N+P, and the RRU locally maintains the channel of the auxiliary access channel in each subframe.
  • the base station generates a retransmitted data packet of the downlink data packet, and the NDI (New Data Indicator, New Data Indicator, NDI for short) and the redundancy version number of the retransmitted data packet remain unchanged, that is, the current NDI and the current redundancy version.
  • the number (Redundancy Version, RV for short) is the same, and the BBU sends the retransmitted data packet to the UE through the RRU in the subframe N+P.
  • N, L, M, and P are all integers greater than 0, and L ⁇ M ⁇ P.
  • the method includes:
  • the BBU schedules the RRU to perform downlink transmission in the subframe N+L in the subframe N.
  • the BBU allocates a downlink transmission resource to the downlink data packet to be transmitted, and sends a scheduling indication to the RRU in the subframe N, where the scheduling indication is used to instruct the RRU to send the downlink data packet to the UE in the subframe N+L.
  • the RRU sends a downlink data packet to the UE in the subframe N+L.
  • the RRU When the time of the subframe N+L is reached, the RRU sends a downlink data packet to the UE, and the downlink data packet may be a new data packet or a retransmitted data packet.
  • the UE decodes the received downlink data packet to generate a first feedback message.
  • the UE successfully decodes the downlink data packet, returns an ACK to the base station, and returns a NACK to the base station if the decoding fails.
  • the base station returns a first feedback message to the RRU.
  • the BBU acquires a channel state of the auxiliary access channel in the subframe N+L.
  • the base station uses the secondary access channel transmission time, if the channel status of the secondary access channel in the subframe N+L is unavailable, the downlink data packet sent by the base station cannot reach the UE correctly, and the UE decodes the downlink data packet. The result is inevitably not accurate, and the first feedback message returned by the UE needs to be corrected.
  • the BBU must acquire the channel state of the secondary access channel before receiving the first feedback message.
  • the RRU receives the first feedback message in the subframe N+M.
  • the RRU sends a first feedback message to the BBU.
  • the BBU receives the first feedback message in the subframe N+P.
  • S210 Generate a retransmission data packet, and then transmit the NDI of the data packet without inversion and the redundancy version number does not change.
  • the BBU sends a retransmission packet to the RRU.
  • the RRU sends a retransmitted data packet to the UE.
  • the BBU processes according to the type of the first feedback message. If the first feedback message is ACK, the current downlink data packet is successfully transmitted, and the sending is started. The next downlink data packet; if the first feedback message is NACK, it indicates that the current downlink data packet transmission fails, generates a retransmission data packet, and then transmits the NDI of the data packet to be inverted and the redundancy version number is increased by one.
  • the acquiring the channel status of the auxiliary access channel in the subframe N+L includes:
  • the BBU maintains a channel state table, where the channel state table stores the channel state of the auxiliary access channel in each subframe.
  • the acquiring the auxiliary access channel in the subframe N+L according to the preset channel state table before the channel status, it also includes:
  • the BBU records the channel state of the secondary access channel in the currently detected subframe into the channel state table.
  • the RRU after detecting the channel state of the secondary access channel in one subframe, the RRU reports the result of the detection to the BBU in the next subframe of the current subframe, for example, the secondary access channel is an unlicensed spectrum channel.
  • the RRU detects the channel state of the unlicensed spectrum channel in the subframe N+2, and reports the channel state of the auxiliary access channel in the subframe N+2 in the subframe N+3.
  • the channel state of the auxiliary access channel in the subframe N+2 can also be reported in the subframe N+4 and the subframe N+5 to ensure that the BBU obtains the subframe before receiving the first feedback message. Channel status.
  • the number of retransmissions of the retransmitted data packet does not change.
  • the base station corrects the ACK or NACK fed back by the UE according to the downlink data packet according to the channel state of the secondary access channel, and keeps the NDI and the redundancy version number of the retransmitted data packet unchanged. change.
  • the hybrid automatic retransmission can be implemented to ensure that the LTE system can quickly transmit data, maximize channel resources, and increase throughput gain when the auxiliary access channel is available.
  • FIG. 3 is a schematic diagram of a specific example of a hybrid automatic retransmission processing method based on an unlicensed spectrum according to an embodiment of the present invention.
  • the embodiment of the present invention relates to a process of hybrid automatic retransmission in a downlink direction, and hybrid automatic in an uplink direction.
  • the process of retransmission can be referred to this embodiment.
  • the BBU generates a scheduling indication in the subframe N, where the scheduling indication is used to indicate that the RRU sends downlink data packets to the UE in the subframe N+2, and the RRU reaches the subframe N+.
  • the downlink data packet is sent to the UE, and the RRU receives the first feedback message returned by the UE in the subframe N+6, and sends a first feedback message to the BBU, and the BBU receives the first feedback message in the subframe N+8, and acquires the first feedback message.
  • the redundancy version number remains unchanged.
  • the BBU sends a retransmitted data packet to the RRU in the subframe N+8.
  • the RRU receives the retransmitted data packet in the subframe N+10, and forwards the retransmitted data packet to the UE.
  • the RRU detects the channel state of the secondary access channel in the subframe N+2, and reports the channel state in the subframe after the subframe N+2.
  • the RRU and the BBU have a delay of two subframes, and the RRU can report the channel state of the subframe N+2 in the subframe between the subframe N+2 and the subframe N+6, ensuring that the BBU is in the subframe N+8.
  • the channel state of the secondary access channel in subframe N+2 is previously received.
  • the RRU After detecting the channel state of the secondary access channel in one subframe, the RRU reports the channel state in the next subframe of the current subframe. For example, the RRU may report the detected subframe N+2 in the subframe N+3.
  • the RRU can receive the channel state of the secondary access channel in subframe N+2 in subframe N+5.
  • FIG. 4 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • a base station includes a BBU 401 and an RRU 402.
  • the RRU 402 is configured to send, according to the scheduling indication of the BBU in the subframe N, a downlink data packet to the user equipment UE in the subframe N+L, and receive, by the N+M, the first feedback message returned by the UE according to the downlink data packet. And forwarding the first feedback message to the BBU 401;
  • the BBU 401 is configured to receive the first feedback message in the subframe N+P, and acquire a channel state of the auxiliary access channel in the subframe N+L; if the channel state is unavailable, the The first feedback message is modified into a second feedback message; the retransmission data packet of the downlink data packet is generated according to the second feedback message; wherein the NDI of the retransmitted data packet is not reversed and the redundancy version number is unchanged; The retransmitted data packet is transmitted to the UE through the RRU 402 in the subframe N+P; wherein N, L, M, and P are integers greater than 0, and L ⁇ M ⁇ P.
  • the acquiring, by the BBU 401, the channel status of the auxiliary access channel in the subframe N+L includes:
  • the RRU 402 is further configured to notify the BBU 501 of the channel state of the auxiliary access channel in the currently detected subframe every time the channel state of the auxiliary access channel in one subframe is detected;
  • the BBU 401 is further configured to record the channel status of the auxiliary access channel in the currently detected subframe into the channel state table.
  • the number of retransmissions of the retransmitted data packet does not change.
  • FIG. 5 is another schematic structural diagram of a base station according to an embodiment of the present invention.
  • base station 5 includes a processor 501, a memory 502, and a transceiver 503.
  • the transceiver 503 is configured to transmit and receive data with and from an external device.
  • the number of processors 501 in the base station 5 may be one or more.
  • processor 501, memory 502, and transceiver 503 may be coupled by a bus system or other means.
  • the base station 5 can be used to perform the method shown in FIG. For the meaning and examples of the terms involved in the embodiment, reference may be made to the corresponding embodiment of FIG. 2. I will not repeat them here.
  • the program code is stored in the memory 502.
  • the processor 501 is configured to call the program code stored in the memory 502 for performing the following operations:
  • N, L, M, and P are integers greater than 0, and L ⁇ M ⁇ P.
  • the performing, by the processor 501, the acquiring a channel state of the auxiliary access channel in the subframe N+L includes:
  • the method before the processor 501 performs the acquiring the channel state of the auxiliary access channel in the subframe N+L according to the preset channel state table, the method further includes:
  • the number of retransmissions of the retransmitted data packet does not change.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

本发明实施例公开了一种基于LAA的混合自动重传方法，包括：RRU根据BBU在子帧N的调度指示在子帧N+L向用户设备UE发送下行数据包；RRU在N+M接收UE根据下行数据包返回的第一反馈消息，并向BBU转发第一反馈消息；BBU在子帧N+P接收第一反馈消息，以及获取子帧N+L内辅助接入信道的信道状态；若信道状态为不可用状态，BBU将第一反馈消息修正为第二反馈消息；BBU根据第二反馈消息生成下行数据包的再传数据包；其中，再传数据包的NDI不翻转和冗余版本号不变；BBU在子帧N+P通过RRU向UE发送再传数据包。本发明实施例还公开了一种基站，采用本发明，实现了一种LAA下的混合自动重传(HARQ)的方法，提高数据吞吐量和增益。

Description

一种基于LAA的混合自动重传处理方法和基站 技术领域
本发明涉及通信领域，尤其涉及一种基于LAA的混合自动重传处理方法和基站。
背景技术
随着通信业务量的急剧增加，3GPP(3rd Generation Partnership Project，第三代合作伙伴计划，简称3GPP)授权频谱显得越来越不足以提供更高的网络容量。为了进一步提高频谱资源的利用，3GPP正讨论如何在授权频谱的帮助下使用未授权频谱，如5GHz频段。这些未授权频谱目前主要是WiFi(Wireless Fidelity，无线保真，简称WiFi)、蓝牙、雷达和医疗等系统在使用。一般来说，为已授权频段设计的接入技术，如LTE(Long Term Evolution，长期演进，简称LTE)不适合在未授权频段上使用，因为LTE这类接入技术对频谱效率和用户体验优化的要求非常高。然而，载波聚合功能让将LTE部署于非授权频段变为可能。3GPP提出了LAA(LTE AssistedAccess，LTE辅助接入，简称LAA)的概念，借助LTE授权频谱的帮助来使用未授权频谱。
对于LTE系统而言，由于非授权频谱资源可用的时刻是随时的，因此数据发送的起始时刻也是随时的，在这种情况下，LTE系统调度器如何适应LAA下对信道快速使用，有效提升传输增益是目前研究的热点。
发明内容
本发明实施例所要解决的技术问题在于，提供一种基于LAA的混合自动重传处理方法。可解决现有技术中LTE系统调度器难以适应在LAA下信道快速占用和释放下提升传输增益的问题。
为了解决上述技术问题，本发明实施例提供了一种基于LAA的混合自动重传处理方法，包括：
所述射频拉远单元RRU根据基带处理单元BBU在子帧N的调度指示在子帧N+L向用户设备UE发送下行数据包；
所述RRU在N+M接收所述UE根据所述下行数据包返回的第一反馈消息，并向所述BBU转发所述第一反馈消息；
所述BBU在子帧N+P接收所述第一反馈消息，以及获取所述子帧N+L内辅助接入信道的信道状态；
若所述信道状态为不可用状态，所述BBU将所述第一反馈消息修正为第二反馈消息；
所述BBU根据所述第二反馈消息生成所述下行数据包的再传数据包；其中，所述再传数据包的NDI不翻转和冗余版本号不变；
所述BBU在子帧N+P通过所述RRU向所述UE发送所述再传数据包；其中，N、L、M和P均为大于0的整数，且L＜M＜P。
在第一种可能的实现方式中，所述获取所述子帧N+L内辅助接入信道的信道状态包括：
根据预设的信道状态表获取所述子帧N+L内辅助接入信道的信道状态。
结合第一方面的第一种可能的实现方式，在第二种可能的实现方式中，所述根据预设的信道状态表获取所述子帧N+L内辅助接入信道的信道状态之前，还包括：
所述RRU每检测到一个子帧内所述辅助接入信道的信道状态时，向所述BBU通知当前检测的子帧内所述辅助接入信道的信道状态；
所述BBU将当前检测的子帧内所述辅助接入信道的信道状态记录到信道状态表中。
结合第一方面，在第三种可能的实现方式中，所述再传数据包的重传次数不变。
结合第一方面，在第四种可能的实现方式中，L＝2，M＝6，P＝8。
本发明实施例第二方面提供了一种基站，包括：RRU和BBU；
所述RRU，用于根据所述BBU在子帧N的调度指示在子帧N+L向用户设备UE发送下行数据包；在N+M接收所述UE根据所述下行数据包返回的第一反馈消息，并向所述BBU转发所述第一反馈消息；
所述BBU，用于在子帧N+P接收所述第一反馈消息，以及获取所述子帧N+L内辅助接入信道的信道状态；若所述信道状态为不可用状态，将所述第 一反馈消息修正为第二反馈消息；根据所述第二反馈消息生成所述下行数据包的再传数据包；其中，所述再传数据包的NDI不翻转和冗余版本号不变；在子帧N+P通过所述RRU向所述UE发送所述再传数据包；其中，N、L、M和P均为大于0的整数，且L＜M＜P。
结合第二方面，在第一种可能的实现方式中，所述BBU获取所述子帧N+L内辅助接入信道的信道状态具体包括：
根据预设的信道状态表获取所述子帧N+L内辅助接入信道的信道状态。
结合第二方面的第一种可能的实现方式，在第二种可能的实现方式中，所述RRU还用于每检测到一个子帧内所述辅助接入信道的信道状态时，向所述BBU通知当前检测的子帧内所述辅助接入信道的信道状态；
所述BBU还用于将当前检测的子帧内所述辅助接入信道的信道状态记录到信道状态表中。
结合第二方面的第一种可能的实现方式，在第三种可能的实现方式中，述再传数据包的重传次数不变。
结合第二方面的第一种可能的实现方式，在第四种可能的实现方式中，L＝2，M＝6，P＝10。
本发明实施例第三方面提供了一种基站，包括：一个或多个处理器、存储器、总线系统、收发器以及一个或多个程序，所述一个或多个处理器、所述存储器和所述收发器通过所述总线系统相连；
其中，所述一个或多个程序被存储在所述存储器中，所述一个或多个程序包括指令，所述指令当被所述基站执行时使所述基站执行如第一方面至第一方面的第四种可能的实现方式中任意一种所述的方法。
实施本发明实施例，具有如下有益效果：
基站根据辅助接入信道的信道状态，对UE根据下行数据包反馈的ACK或NACK进行修正，以及使再传数据包的NDI和冗余版本号保持不变。能LAA下混合自动重传的适配，保证LTE系统在辅助接入信道可用时能快速下发数据、最大化使用信道资源和增加吞吐量增益。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，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是本发明实施例提供的一种LTE通信系统的结构示意图；
图2是本发明实施例提供的一种基于LAA的混合自动重传的流程示意图；
图3是本发明实施例提供的一种LAA的混合自动重传的具体示意图；
图4是本发明实施例提供的一种基站的结构示意图；
图5是本发明实施例提供的一种用户设备的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
参见图1，为本发明实施例提供的一种LTE通信系统的结构示意图，在本发明实施例中，LTE通信系统包括基站1和用户设备2，基站1包括BBU11和RRU12，基站1和用户设备2之间通过无线空口传输数据。辅助接入信道可以是非授权频谱信道或授权频谱信道，LTE通信系统利用辅助接入信道进行数据传输，在利用辅助接入信道进行传输前必须对辅助接入信道进行CCA(Clear Channel Assessment，CCA，空闲信道评估，简称CCA)，在辅助接入信道为空闲状态才能获取辅助接入信道的使用权，并通过辅助接入信道进行数据传输，即LBT(Listen Before Talk，先听后说，简称LBT)机制。下面分别就下行方向和上行方向对基于LAA的HARQ处理流程进行说明：
下行方向：基站包括BBU(Building Base band Unit，基带处理单元，简称BBU)和RRU(Radio Remote Unit，射频拉远单元，简称RRU)，BBU与RRU之间进行交互以及RRU与UE(User Equipment，用户设备，简称UE)之间进行交互均存在一定的时延。BBU在子帧N调度RRU在子帧N+L进行下行传输，到达子帧N+L时，RRU通过无线空口向UE发送下行数据包，UE接 收到下行数据包后，对下行数据包进行解码，如果解码成功，向基站返回确认反馈消息ACK，如果解码失败，向基站返回非确认反馈消息NACK，基站的RRU在子帧N+M接收到用户设备返回的第一反馈消息，第一反馈消息包括NACK或ACK，由于BBU和RRU之间的时延，BBU在子帧N+P接收到反馈消息，此时BBU获取子帧N+L内辅助接入信道的信道状态，因RRU在传输下行数据包的N+L子帧内如果辅助接入信道为不可用状态，则RRU无法N+L子帧成功发送下行数据包，那么RRU在子帧N+P接收到的针对下行数据包的第一反馈消息是不准确的，需要对第一反馈消息修正为第二反馈消息，第二反馈消息用于表示基站发送下行数据包的子帧内辅助接入信道为不可用状态。需要说明的是，RRU必须在子帧N+P之前获取到子帧N+L内辅助接入信道的信道状态，获取的方法可以是：RRU在子帧N+L内检测辅助接入信道的信息状态，N+L子帧后面的子帧向RRU上报检测到的信道状态，必须保证RRU在子帧N+P之前接收到信道状态，RRU在本地维护每个子帧内辅助接入信道的信道状态。基站生成下行数据包的再传数据包，该再传数据包的NDI(New Data Indicator，新数据指示，简称NDI)和冗余版本号保持不变，即和当前的NDI和当前的冗余版本号(Redundancy Version，简称RV)相同，BBU在子帧N+P通过RRU向UE发送该再传数据包。
其中，N、L、M和P均为大于0的整数，且L＜M＜P。
参见图2，为本发明实施例提供的一种基于LAA的混合自动重传处理方法，在本发明实施例中，所述方法包括：
S201、BBU在子帧N调度RRU在子帧N+L进行下行传输。
具体的，BBU为待传输的下行数据包分配下行传输资源，在子帧N向RRU发送调度指示，调度指示用于指示RRU在子帧N+L向UE发送下行数据包。
S202、RRU在子帧N+L向UE发送下行数据包。
其中，到达子帧N+L的时刻时，RRU向UE发送下行数据包，下行数据包可以是新传数据包或重传数据包。
S203、UE对接收到的下行数据包进行解码，生成第一反馈消息。
具体的，UE对下行数据包解码成功，向基站返回ACK，如果解码失败，向基站返回NACK。
S204、基站向RRU返回第一反馈消息。
S205、BBU获取子帧N+L内辅助接入信道的信道状态。
其中，由于基站使用辅助接入信道传输时间，如果子帧N+L内辅助接入信道的信道状态为不可用状态，基站发送的下行数据包无法正确达到UE，UE对该下行数据包的解码结果必然不是准确的，需要对UE返回的第一反馈消息进行修正。
需要说明的是，BBU必须在接收到第一反馈消息之前获取到辅助接入信道的信道状态。
S206、RRU在子帧N+M接收到第一反馈消息。
S207、RRU向BBU发送第一反馈消息。
S208、BBU在子帧N+P接收第一反馈消息。
S209、若信道状态为不可用状态，将第一反馈消息转换为第二反馈消息。
S210、生成再传数据包，再传数据包的NDI不翻转且冗余版本号不变。
其中，如果上一数据包为新传数据包，则再传数据为重传数据包，新传数据包的冗余版本号RV＝0，假设新数据指示NDI＝1，则再传数据包的RV＝0，NDI不翻转仍然为0；如果上一数据包为重传数据包，其RV＝1，NDI＝1，则再传数据包的RV＝1不变，NDI＝1也不翻转。
S211、BBU向RRU发送再传数据包。
S212、RRU向UE发送再传数据包。
需要说明的是，如果子帧N+L内辅助接入信道为空闲状态，BBU根据第一反馈消息的类型进行处理，如果第一反馈消息为ACK，表示当前的下行数据包传输成功，开始发送下一下行数据包；如果第一反馈消息为NACK，表示当前的下行数据包传输失败，生成再传数据包，再传数据包的NDI翻转且冗余版本号加1。
可选的，所述获取所述子帧N+L内辅助接入信道的信道状态包括：
根据预设的信道状态表获取所述子帧N+L内辅助接入信道的信道状态。
具体的，BBU维护一个信道状态表，信道状态表中存储有每个子帧内辅助接入信道的信道状态。
可选的，所述根据预设的信道状态表获取所述子帧N+L内辅助接入信道 的信道状态之前，还包括：
所述RRU每检测到一个子帧内所述辅助接入信道的信道状态时，向所述BBU通知当前检测的子帧内所述辅助接入信道的信道状态；
所述BBU将当前检测的子帧内所述辅助接入信道的信道状态记录到信道状态表中。
具体的，RRU每检测到一个子帧内的辅助接入信道的信道状态后，在当前的子帧的下一子帧向BBU上报检测的结果，例如，辅助接入信道为非授权频谱信道，RRU检测子帧N+2内非授权频谱信道的信道状态，在子帧N+3上报子帧N+2内辅助接入信道的信道状态。需要说明的是，子帧N+2内辅助接入信道的信道状态也可以在子帧N+4和子帧N+5进行上报，以确保BBU在接收到第一反馈消息的子帧之前获取到信道状态。
可选的，所述再传数据包的重传次数不变。
可选的，L＝2，M＝6，P＝8。
实施本发明的实施例，在下行方向，基站根据辅助接入信道的信道状态，对UE根据下行数据包反馈的ACK或NACK进行修正，以及使再传数据包的NDI和冗余版本号保持不变。能实现基于混合自动重传，保证LTE系统在辅助接入信道可用时能快速下发数据、最大化使用信道资源和增加吞吐量增益。
参见图3，为本发明实施例提供的一种基于非授权频谱的混合自动重传处理方法的具体示例图，本发明实施例涉及下行方向的混合自动重传的处理过程，上行方向的混合自动重传的处理过程可参照本实施例。
其中以L＝2，M＝6，P＝8为例，BBU在子帧N生成调度指示，调度指示用于指示RRU在子帧N+2向UE发送下行数据包，RRU到达子帧N+2时向UE发送下行数据包，RRU在子帧N+6接收到UE返回的第一反馈消息，并向BBU发送第一反馈消息，BBU在子帧N+8接收第一反馈消息，获取子帧N+2内非授权频谱的信道状态，如果辅助接入信道的信道状态为不可用状态，将第一反馈消息转换为第二反馈消息，生成再传数据包，再传数据包的NDI和冗余版本号保持不变，BBU在子帧N+8向RRU发送再传数据包，RRU在子帧N+10接收再传数据包，并将再传数据包转发给UE。其中，RRU在子帧N+2内检测辅助接入信道的信道状态，在子帧N+2后的子帧上报该信道状态，通 常RRU和BBU之间具有两个子帧的时延，RRU可以在子帧N+2和子帧N+6之间的子帧上报子帧N+2的信道状态，确保BBU在子帧N+8之前收到子帧N+2内辅助接入信道的信道状态。RRU每检测到一个子帧内的辅助接入信道的信道状态后，在当前子帧的下一子帧上报信道状态，例如：RRU可以在子帧N+3上报检测到的子帧N+2内辅助接入信道的信道状态，那么RRU在子帧N+5就能受到子帧N+2内辅助接入信道的信道状态。
参见图4，为本发明实施例提供的一种基站的结构示意图，在本发明实施例中，基站包括BBU401和RRU402，
RRU402，用于根据所述BBU在子帧N的调度指示在子帧N+L向用户设备UE发送下行数据包；在N+M接收所述UE根据所述下行数据包返回的第一反馈消息，并向BBU401转发所述第一反馈消息；
BBU401，用于在子帧N+P内接收所述第一反馈消息，以及获取所述子帧N+L内辅助接入信道的信道状态；若所述信道状态为不可用状态，将所述第一反馈消息修正为第二反馈消息；根据所述第二反馈消息生成所述下行数据包的再传数据包；其中，所述再传数据包的NDI不翻转和冗余版本号不变；在子帧N+P通过RRU402向所述UE发送所述再传数据包；其中，N、L、M和P均为大于0的整数，且L＜M＜P。
可选的，BBU401获取所述子帧N+L内辅助接入信道的信道状态具体包括：
根据预设的信道状态表获取所述子帧N+L内辅助接入信道的信道状态。
可选的，RRU402还用于每检测到一个子帧内所述辅助接入信道的信道状态时，向BBU501通知当前检测的子帧内所述辅助接入信道的信道状态；
BBU401还用于将当前检测的子帧内所述辅助接入信道的信道状态记录到信道状态表中。
可选的，所述再传数据包的重传次数不变。
可选的，其特征在于，L＝2，M＝6，P＝10。
本发明实施例和图2的实施例基于同一构思，其带来的技术效果也相同，具体原理请参照图2的实施例的描述，此处不再赘述。
参见图5，为本发明实施例提供的一种基站的另一结构示意图，在本发明 实施例中，基站5包括处理器501、存储器502和收发器503。收发器503用于与外部设备之间收发数据。基站5中的处理器501的数量可以是一个或多个。本发明的一些实施例中，处理器501、存储器502和收发器503可通过总线系统或其他方式连接。基站5可以用于执行图2所示的方法。关于本实施例涉及的术语的含义以及举例，可以参考图2对应的实施例。此处不再赘述。
其中，存储器502中存储程序代码。处理器501用于调用存储器502中存储的程序代码，用于执行以下操作：
根据基带处理单元BBU在子帧N的调度指示在子帧N+L向用户设备UE发送下行数据包；
在N+M接收所述UE根据所述下行数据包返回的第一反馈消息，并向所述BBU转发所述第一反馈消息；
在子帧N+P接收所述第一反馈消息，以及获取所述子帧N+L内辅助接入信道的信道状态；
若所述信道状态为不可用状态，将所述第一反馈消息修正为第二反馈消息；
根据所述第二反馈消息生成所述下行数据包的再传数据包；其中，所述再传数据包的NDI不翻转和冗余版本号不变；
在子帧N+P通过所述RRU向所述UE发送所述再传数据包；其中，N、L、M和P均为大于0的整数，且L＜M＜P。
在本发明的一些实施例中，处理器501执行所述获取所述子帧N+L内辅助接入信道的信道状态包括：
根据预设的信道状态表获取所述子帧N+L内辅助接入信道的信道状态。
在本发明的一些实施例中，处理器501执行所述根据预设的信道状态表获取所述子帧N+L内辅助接入信道的信道状态之前，还包括：
每检测到一个子帧内所述辅助接入信道的信道状态时，向所述BBU通知当前检测的子帧内所述辅助接入信道的信道状态；
将当前检测的子帧内所述辅助接入信道的信道状态记录到信道状态表中。
在本发明的一些实施例中，所述再传数据包的重传次数不变。
在本发明的一些实施例中，L＝2，M＝6，P＝8。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程， 是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory，ROM)或随机存储记忆体(Random Access Memory，RAM)等。
以上所揭露的仅为本发明一种较佳实施例而已，当然不能以此来限定本发明之权利范围，本领域普通技术人员可以理解实现上述实施例的全部或部分流程，并依本发明权利要求所作的等同变化，仍属于发明所涵盖的范围。

Claims (10)

  1. 一种基于LAA的混合自动重传处理方法，其特征在于，包括：
    射频拉远单元RRU根据基带处理单元BBU在子帧N的调度指示在子帧N+L向用户设备UE发送下行数据包；
    所述RRU在N+M接收所述UE根据所述下行数据包返回的第一反馈消息，并向所述BBU转发所述第一反馈消息；
    所述BBU在子帧N+P接收所述第一反馈消息，以及获取所述子帧N+L内辅助接入信道的信道状态；
    若所述信道状态为不可用状态，所述BBU将所述第一反馈消息修正为第二反馈消息；
    所述BBU根据所述第二反馈消息生成所述下行数据包的再传数据包；其中，所述再传数据包的新数据指示NDI不翻转和冗余版本号RV不变；
    所述BBU在子帧N+P通过所述RRU向所述UE发送所述再传数据包；其中，N、L、M和P均为大于0的整数，且L＜M＜P。
  2. 如权利要求1所述的方法，其特征在于，所述获取所述子帧N+L内辅助接入信道的信道状态包括：
    根据预设的信道状态表获取所述子帧N+L内辅助接入信道的信道状态。
  3. 如权利要求2所述的方法，其特征在于，所述根据预设的信道状态表获取所述子帧N+L内辅助接入信道的信道状态之前，还包括：
    所述RRU每检测到一个子帧内所述辅助接入信道的信道状态时，向所述BBU通知当前检测的子帧内所述辅助接入信道的信道状态；
    所述BBU将当前检测的子帧内所述辅助接入信道的信道状态记录到信道状态表中。
  4. 如权利要求1所述的方法，其特征在于，所述再传数据包的重传次数不变。
  5. 如权利要求1所述的方法，其特征在于，L＝2，M＝6，P＝8。
  6. 一种基站，其特征在于，包括：RRU和BBU；
    所述RRU，用于根据所述BBU在子帧N的调度指示在子帧N+L向用户设备UE发送下行数据包；在N+M接收所述UE根据所述下行数据包返回的第一反馈消息，并向所述BBU转发所述第一反馈消息；
    所述BBU，用于在子帧N+P内接收所述第一反馈消息，以及获取所述子帧N+L内辅助接入信道的信道状态；若所述信道状态为不可用状态，将所述第一反馈消息修正为第二反馈消息；根据所述第二反馈消息生成所述下行数据包的再传数据包；其中，所述再传数据包的新数据指示NDI不翻转和冗余版本号RV不变；在子帧N+P通过所述RRU向所述UE发送所述再传数据包；其中，N、L、M和P均为大于0的整数，且L＜M＜P。
  7. 如权利要求6所述的基站，其特征在于，所述BBU获取所述子帧N+L内辅助接入信道的信道状态具体包括：
    根据预设的信道状态表获取所述子帧N+L内辅助接入信道的信道状态。
  8. 如权利要求7所述的基站，其特征在于，
    所述RRU还用于每检测到一个子帧内所述辅助接入信道的信道状态时，向所述BBU通知当前检测的子帧内所述辅助接入信道的信道状态；
    所述BBU还用于将当前检测的子帧内所述辅助接入信道的信道状态记录到信道状态表中。
  9. 如权利要求6所述的基站，其特征在于，所述再传数据包的重传次数不变。
  10. 如权利要求6所述的基站，其特征在于，L＝2，M＝6，P＝10。
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