WO2009100651A1 - 操作harq缓冲器的方法 - Google Patents

操作harq缓冲器的方法 Download PDF

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Publication number
WO2009100651A1
WO2009100651A1 PCT/CN2009/000129 CN2009000129W WO2009100651A1 WO 2009100651 A1 WO2009100651 A1 WO 2009100651A1 CN 2009000129 W CN2009000129 W CN 2009000129W WO 2009100651 A1 WO2009100651 A1 WO 2009100651A1
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Prior art keywords
harq
enode
harq buffer
pdcch message
ack
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Ceased
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PCT/CN2009/000129
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English (en)
French (fr)
Inventor
Tao Yang
Antonella Faniuolo
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Nokia Shanghai Bell Co Ltd
Alcatel Lucent SAS
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Alcatel Lucent Shanghai Bell Co Ltd
Alcatel Lucent SAS
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Application filed by Alcatel Lucent Shanghai Bell Co Ltd, Alcatel Lucent SAS filed Critical Alcatel Lucent Shanghai Bell Co Ltd
Priority to EP09711300.5A priority Critical patent/EP2242322B1/en
Priority to JP2010545350A priority patent/JP5384526B2/ja
Priority to US12/866,069 priority patent/US20110029834A1/en
Publication of WO2009100651A1 publication Critical patent/WO2009100651A1/zh
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
    • 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
    • H04L1/1877—Buffer management for semi-reliable protocols, e.g. for less sensitive applications like streaming video
    • 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
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/02—Topology update or discovery
    • H04L45/04—Interdomain routing, e.g. hierarchical routing
    • 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
    • H04L2001/125—Arrangements for preventing errors in the return channel

Definitions

  • the present invention relates to wireless communication, and in particular to a method for operating a HARQ (Hybrid Automatic Repeat Request) buffer in an LTE (Long Term Evolution) system, which can be after a UE (User Equipment) receives a HARQ ACK (HARQ Acknowledgment)
  • HARQ Hybrid Automatic Repeat Request
  • LTE Long Term Evolution
  • UE User Equipment
  • HARQ ACK HARQ Acknowledgment
  • the present invention has been accomplished in view of the problems in the prior art. It is an object of the present invention to provide a method of operating a HARQ buffer that is capable of optimizing the control of a HARQ buffer after a UE receives a HARQ ACK.
  • a method of operating a HARQ buffer comprising the steps of: receiving a HARQ ACK; maintaining a HARQ buffer in response to receiving a HARQ ACK; and not receiving a PDCCH for a predetermined duration
  • the HARQ buffer is cleared.
  • a method of operating a HARQ buffer comprising the steps of: receiving a HARQ ACK from an eNode B (evolved Node B); maintaining a HARQ buffer in response to receiving the HARQ ACK; The desired new transmission is not detected within the predetermined duration, the PDCCH message for the new transmission is sent from the eNode B to the UE; and the HARQ buffer is emptied in response to receipt of the PDCCH message.
  • the method further comprises: the UE performing a new transmission based on the received PDCCH message.
  • a method of operating a HARQ buffer comprising the steps of: receiving a HARQ ACK from an eNode B; maintaining a HARQ buffer in response to receiving the HARQ ACK; for a predetermined duration The expected retransmission is not detected, and is sent from the eNode B to the UE. Retransmitting the PDGGH message; and performing retransmission in response to receiving the PDCCH message.
  • the method further comprises the step of: maintaining the HARQ buffer until a maximum retransmission limit.
  • the HARQ ACK is caused by a HARQ NACK from the eNode B occurring on the UE side.
  • FIG. 1 illustrates the operation of the eNode B and the UE in the first scenario in accordance with an embodiment of the present invention
  • FIG. 3 illustrates an operation procedure of an eNode B and a UE in a third scenario according to an embodiment of the present invention
  • FIG. 4 shows an operation procedure of an eNode B and a UE in a fourth scenario according to an embodiment of the present invention. detailed description
  • FIG. 1 shows an operation procedure of an eNode B and a UE in a first scenario according to an embodiment of the present invention.
  • the eNode B in the first case, only sends an ACK message on the PHICH, but does not send a PDCCH message to the current UE, that is, a control command.
  • step S10 the eNode B transmits a HARQ ACK to the UE on the PHICH.
  • the UE maintains its HARQ buffer and stops its own transmission in response to receipt of the HARQ ACK. Then, the UE monitors the PDCCH message, that is, determines whether a PDCCH message has been received within a predetermined duration. Since no PDCCH is sent to the UE, the UE does not receive the PDCCH message for a predetermined duration.
  • step S12 the UE clears its HARQ buffer. Alternatively, the UE may maintain the HARQ buffer up to the maximum retransmission limit or until a PDCCH message is received.
  • FIG. 2 shows an operation procedure of an eNode B and a UE in a second scenario according to an embodiment of the present invention.
  • the eNode B sends a HARQ ACK to the UE on the PHICH and transmits a PDCCH message for the new transmission, but the PDCCH message is lost on the UE side.
  • the eNode B sends a HARQ AK to the UE on the PHIGH, and sends a PDCCH message for transmitting new data to the UE.
  • the UE since the PDCCH message is lost, the UE holds the HARQ buffer and stops its transmission.
  • the eNode B Since the PDCCH message is lost, the eNode B cannot detect a new transmission on the scheduled resource within a predetermined time, so the eNode B knows that the PDCCH message has been lost. At this time, the eNode B transmits the PDCCH message for new data transmission to the UE again.
  • the UE clears its HARQ buffer and performs the new transmission.
  • Figure 3 illustrates the operation of the eNode B and UE in a third scenario in accordance with an embodiment of the present invention.
  • the eNode B transmits a HARQ NACK for non-adaptive retransmission to the UE, but a NACK->ACK error occurs on the UE side.
  • step S30 the eNode B sends a HARQ NACK for non-adaptive retransmission to the UE, but in the transmission process, a NACK->ACK error occurs on the UE side, so the UE will receive the HARQ ACK message.
  • the UE maintains its HARQ buffer and stops its transmission in response to receipt of the HARQ ACK message.
  • the eNode B does not receive the desired retransmission data within a predetermined time. At this time, the eNode B knows that a NACK->ACK error has occurred from the UE side, and retransmits the PDCCH message for indicating retransmission.
  • step S32 if the UE receives the PDCCH message for retransmission, the UE performs retransmission based on the PDCCH message just received.
  • FIG. 4 shows an operation procedure of an eNode B and a UE in a fourth scenario according to an embodiment of the present invention.
  • the eNode B transmits a HARQ NACK and a PDCCH message for adaptive retransmission to the UE, but on the UE side, a NACK->ACK error occurs and the PDCCH message is lost.
  • step S40 the eNode B transmits a HARQ NACK and a PDCCH for adaptive retransmission to the UE.
  • a NACK->ACK error has occurred and the PDCCH message is lost, that is, the UE has only received the erroneous HARQ ACK message.
  • the UE maintains its HARQ-buffer and stops its transmission.
  • the eNode B learns that the PDCCH is lost and a NACK->ACK error occurs.
  • step S42 the eNode B again sends a PDCCH message to the UE for retransmission.
  • step S43 after receiving the PDCCH message, the UE performs corresponding retransmission based on the received PDCCH message.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Description

操作- HARQ缓冲器的方法 技术领域
本发明涉及无线通信， 具体涉及一种在 LTE (长期演进）系统中操作 HARQ (混合自动重传请求）缓冲器的方法，能够在 UE (用户设备）接收到 HARQ ACK (HARQ 肯定确认） 之后对 HARQ缓冲器的控制进行优化。 背景技术
在 LTE系统中，当 UE仅仅在 PHICH(HARQ反馈指示信道）上接收到 HARQ ACK而没有任何 PDCCH消息时， UE需要保持其 HARQ缓冲器。 但是如果 UE 在任何情况下都继续保持 HARQ缓冲器直到最大重传限制， 则造成了资源的浪 费。 因此需要寻求一种优化的 HARQ缓冲器控制方法。 发明内容
鉴于现有技术中存在的问题， 完成了本发明。本发明的目的是提出一种操作 HARQ缓冲器的方法，能够在 UE接收到 HARQ ACK之后对 HARQ缓冲器的控 制进行优化。
在本发明的一个方面， 提出了一种操作 HARQ缓冲器的方法， 包括步骤： 接收 HARQ ACK; 响应于对 HARQ ACK的接收而保持 HARQ缓冲器； 以及在 预定的持续时间段内未接收到 PDCCH (物理下行控制信道） 消息的情况下， 清 空 HARQ缓冲器。
在本发明的另一方面， 提出了一种操作 HARQ 缓冲器的方法， 包括步骤： 接收来自 eNode B (演进的节点 B ) 的 HARQ ACK; 响应于对 HARQ ACK的接 收而保持 HARQ 缓冲器； 在预定的持续时间段内未检测到期望的新传输， 从 eNode B向 UE发送用于新传输的 PDCCH消息； 以及响应于对 PDCCH消息的 接收而清空 HARQ缓冲器。
优选地， 该方法还包括： UE基于接收的 PDCCH消息而执行新传输。
在本发明的另一方面， 提出了一种操作 HARQ缓冲器的方法， 包括步骤- 接收来自 eNode B的 HARQ ACK; 响应于对 HARQ ACK的接收而保持 HARQ 缓冲器； 在预定的持续时间段内未检测到期望的重传， 从 eNode B向 UE发送用 于重传的 PDGGH消息； 以及响应于对 PDCCH消息的接收而执行重传。
优选地， 所述方法还包括步骤： 保持 HARQ缓冲器直到最大重传限制。 优选地，所述 HARQ ACK是因为来自 eNode B的 HARQ NACK在 UE侧发 生错误而引起的。
利用本发明的方法， 能够避免持续保持 HARQ 缓冲器所造成的资源浪费并 且能够避免可能的上行数据传输碰撞。 附图说明
从下面结合附图的详细描述中， 本发明的上述特征和优点将更明显， 其中- 图 1示出了根据本发明实施例在第一种情形下 eNode B和 UE的操作过程； 图 2示出了根据本发明实施例在第二种情形下 eNode B和 UE的操作过程； 图 3示出了根据本发明实施例在第三种情形下 eNode B和 UE的操作过程； 以及
图 4示出了根据本发明实施例在第四种情形下 eNode B和 UE的操作过程。 具体实施方式
本发明首选的实施例将在下面结合附图进行描述。在下面的描述过程中， 省 略了对于本发明来说是不必要的细节和功能， 以防止对本发明的理解造成混淆。
图 1示出了根据本发明实施例在第一种情形下 eNode B和 UE的操作过程。 如图 1所示， 在第一种情形下， eNode B仅仅在 PHICH上发送 ACK消息， 但是 没有给当前 UE发送 PDCCH消息， 即控制命令。
在步骤 S 10， eNode B在 PHICH上将 HARQ ACK发送给 UE。 在步骤 SI 1 , UE响应于对 HARQ ACK的接收而保持其 HARQ缓冲器并且停止其自身的传输。 然后， UE 监视 PDCCH 消息， 也就是判断在预定的持续时间段内是否收到了 PDCCH消息。 由于没有 PDCCH发送给该 UE， 在预定的持续时间段内 UE没有 收到 PDCCH消息。 在步骤 S12, UE清空其 HARQ缓冲器。 作为另一选择， UE 可以保持 HARQ缓冲器直到最大重传限制或者直到接收到 PDCCH消息。
图 2示出了根据本发明实施例在第二种情形下 eNode B和 UE的操作过程。 在第二种情形下， eNode B在 PHICH上发送 HARQ ACK给 UE并且发送用于新 的传输的 PDCCH消息， 但是 PDCCH消息在 UE侧丢失。 在步骤 - S20， eNode B在 PHIGH上发送 · HARQ A K给 UE， 并且发送用于 传输新数据的 PDCCH消息给 UE。
在步骤 S21 , 由于 PDCCH消息丢失， 因此 UE保持 HARQ缓冲器并且停止 其传输。
由于 PDCCH消息丢失， eNode B在预定的时间内无法在所调度的资源上检 测到新的传输， 因此 eNode B得知该 PDCCH消息已经丢失。 此时， eNode B向 UE再次发送用于新数据传输的 PDCCH消息。
在步骤 S22， 当 UE检测到用于新传输的 PDCCH消息时， UE清空其 HARQ 缓冲器并且执行该新传输。
图 3示出了根据本发明实施例在第三种情形下 eNode B和 UE的操作过程。 如图 3所示， 在第三种情形下， eNode B向 UE发送用于非自适应重传的 HARQ NACK, 但是在 UE侧发生了 NACK->ACK错误。
在步骤 S30, eNode B向 UE发送用于非自适应重传的 HARQ NACK, 但是 在传输过程种，在 UE侧发生了 NACK->ACK错误，因此 UE将接收到 HARQ ACK 消息。
在步骤 S31， UE响应于对 HARQ ACK消息的接收而保持其 HARQ缓冲器 并且停止其传输。
在预定的时间内， 由于 UE未接收到 HARQ NACK, 因此没有进行重传。 换 言之， 在预定的时间内，. eNode B未接收到期望的重传数据。 此时， eNode B得 知在从 UE侧发生了 NACK->ACK错误， 并且重新发送 PDCCH消息， 用于指示 重传。
在步骤 S32， 如果 UE接收到用于重传的 PDCCH消息， 则 UE基于刚刚收 到的 PDCCH消息而进行重传。
图 4示出了根据本发明实施例在第四种情形下 eNode B和 UE的操作过程。 如图 4所示， 在第四种情形下， eNode B向 UE发送 HARQ NACK和用于自适应 重传的 PDCCH消息， 但是在 UE侧， 发生了 NACK->ACK错误并且 PDCCH消 息丢失。
在步骤 S40, eNode B向 UE发送 HARQ NACK和用于自适应重传的 PDCCH。 但是在 UE侧， 发生了 NACK->ACK错误并且 PDCCH消息丢失， 也就是 UE仅 仅接收到了错误的 HARQ ACK消息。 在步骤 S4h 响应于对错误 ACK消惠的接收， UE保持其 HARQ-缓冲器并 且停止其传输。
在预定的持续时间段内， 由于 eNode B未在调度的资源上检测到期望的重 传， eNode B得知 PDCCH丢失并且 NACK->ACK错误发生。
在步骤 S42， eNode B再次向 UE发送 PDCCH消息用于重传。
在步骤 S43， 当 UE接收到 PDCCH消息后， 基于接收的 PDCCH消息进行 相应的重传。
以上所述， 仅为本发明中的具体实施方式， 但本发明的保护范围并不局限于 此， 任何熟悉该技术的人在本发明所揭露的技术范围内，可轻易想到的变换或替 换， 都应涵盖在本发明的包含范围之内。 因此， 本发明的保护范围应该以权利要 求书的保护范围为准。

Claims

权-利要求
1、 一种操作 HARQ缓冲器的方法， 包括步骤：
接收 HARQ ACK;
响应于对 HARQ ACK的接收而保持 HARQ缓冲器； 以及
在预定的持续时间段内未接收到 PDCCH消息的情况下， 清空 HARQ缓冲 器。
2、 如权利要求 1所述的方法， 还包括步骤： 保持 HARQ缓冲器直到最大 重传限制或者接收到 PDCCH消息。
3、 一种操作 HARQ 缓冲器的方法， 包括步骤：
接收来自 eNode B的 HARQ ACK;
响应于对 HARQ ACK的接收而保持 HARQ缓冲器；
在预定的持续时间段内未检测到期望的新传输的情况下， 从 eNode B向 UE 发送用于新传输的 PDCCH消息； 以及
响应于对 PDCCH消息的接收而清空 HARQ缓冲器。
4、 如权利要求 3所述的方法， 还包括：
UE基于接收的 PDCCH消息而执行新传输。
5、 一种操作 HARQ缓冲器的方法， 包括步骤：
接收来自 eNode B的 HARQ ACK;
响应于对 HARQ ACK的接收而保持 HARQ缓冲器；
在预定的持续时间段内未检测到期望的重传，从 eNode B向 UE发送用于重 传的 PDCCH消息； 以及
响应于对 PDCCH消息的接收而执行重传。
6、如权利要求 5所述的方法，其中，所述 HARQ ACK是因为来自 eNode B 的 HARQ NACK在 UE侧发生错误而引起的。
PCT/CN2009/000129 2008-02-04 2009-02-04 操作harq缓冲器的方法 Ceased WO2009100651A1 (zh)

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Application Number Priority Date Filing Date Title
EP09711300.5A EP2242322B1 (en) 2008-02-04 2009-02-04 Method for the harq buffer operation
JP2010545350A JP5384526B2 (ja) 2008-02-04 2009-02-04 Ｈａｒｑバッファを操作するための方法
US12/866,069 US20110029834A1 (en) 2008-02-04 2009-02-04 Method for operating harq buffer

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CN200810033557XA CN101505212B (zh) 2008-02-04 2008-02-04 操作harq缓冲器的方法

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