WO2010078831A1 - 移动通信终端接收下行数据的控制方法和移动通信终端 - Google Patents

移动通信终端接收下行数据的控制方法和移动通信终端 Download PDF

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Publication number
WO2010078831A1
WO2010078831A1 PCT/CN2010/000028 CN2010000028W WO2010078831A1 WO 2010078831 A1 WO2010078831 A1 WO 2010078831A1 CN 2010000028 W CN2010000028 W CN 2010000028W WO 2010078831 A1 WO2010078831 A1 WO 2010078831A1
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WIPO (PCT)
Prior art keywords
mobile communication
communication terminal
indication information
downlink data
feedback indication
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PCT/CN2010/000028
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English (en)
French (fr)
Inventor
谢芳
胡臻平
崔春风
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中国移动通信集团公司
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Publication of WO2010078831A1 publication Critical patent/WO2010078831A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829Arrangements specially adapted for the receiver end
    • H04L1/1848Time-out mechanisms
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • H04L1/188Time-out mechanisms

Definitions

  • Control method for mobile communication terminal receiving downlink data and mobile communication terminal
  • the present invention relates to mobile communication technologies, and in particular, to a technology for a mobile terminal in a TDD system to receive downlink data. Background technique
  • the Discontinuous Reception (DRX) function allows the user equipment (User Equipment: UE) to shut down the receiver under certain conditions without having to constantly listen to the Physical Downlink Control Channel (PDCCH). The purpose of the electricity.
  • UE User Equipment
  • PDCCH Physical Downlink Control Channel
  • the basic principle of DRX is as shown in Figure 1.
  • the DRX cycle consists of a continuous PDCCH listening phase (On Duration) and a possible sleep phase (Opportunity for DRX).
  • the units of the On Duration phase and the Opportunity for DRX phase are all subframes. number.
  • the On Duration phase the UE must continue to listen to each of the PDCCH-containing subframes to obtain the resource allocation indication of the uplink and downlink transmission of each subframe, and determine the uplink and downlink allocations that the base station allocates to itself according to the resource allocation indication of each subframe. Frequency resources, and data processing on the allocated time-frequency resources. The UE may not need to continuously listen to the PDCCH during the Opportunity for DRX phase.
  • the UE in order to save the battery consumption of the UE when there is no data to be transmitted and received, the UE can perform a DRX operation, that is, temporarily turn off the receiver. And waking up to monitor the corresponding PDCCH at a time agreed with the base station, so as to know whether the base station has data to send to the UE during the sleep period.
  • the DRX operation includes some set parameters and some control timers.
  • the included parameters include a DRX cycle (DRX Cycle), the included timer has an On Duration Timer, and the DRX inactivity timer. (DRX Inactivity Timer) and so on.
  • the UE monitors the PDCCH in the On Duration period.
  • the sleep state is performed after the On Duration Timer expires. If the UE is in the On Duration period When the internal monitoring PDCCH learns that there is a data indication sent to itself, the DRX Inactivity Timer is started. If the PDCCH again indicates that data is transmitted to the user before the DRX Inactivity Timer expires, the DRX Inactivity Timer will be restarted; only when DRX The Inactivity Timer and the On Duration timer expire, and the UE can enter the sleep phase. Therefore, the UE's On Duration in the DR cycle is kept active (Active) and may be active in the Opportunity for DRX phase. , may also be in a dormant state.
  • DRX control and Hybrid Automatic Repeat Request are respectively operated independently, that is, in HARQ.
  • HARQ RTT Round Trip Time
  • HARQ retransmissions do not further affect normal DRX operation.
  • the DRX period As shown in Figure 2, taking a DRX cycle as an example, set the DRX period to 20 subframes, where: The On Duration phase is two subframes, and the DRX Inactivity Timer is two subframes. The existing standard specifies one subframe. The length of the data is lms. If the eUE monitors the PDCCH to indicate the downlink transmission in the first subframe of the On Duration phase, the receiving control process of the downlink data specifically includes the following steps:
  • the eUE turns on the receiver, ends the sleep state, enters the receiving state, and starts another timer DRX Retransmission Timer timer. .
  • the DRX Retransmission Timer is started to monitor the waiting time for receiving retransmission data.
  • the eNB does not demodulate the NACK to ACK and then does not retransmit the data
  • the eUE waits indefinitely. The length depends on the required maximum waiting time. It is determined that the eNB is configured to the eUE through a Radio Resource Control (RRC) procedure.
  • RRC Radio Resource Control
  • a Radio Resource Control (RRC) procedure During the operation of the DRX Retransmission Timer, if the eUE correctly receives the retransmitted data, the receiver turns off the receiver and enters the dormant state after receiving the data; when the DRX Retransmission Timeri ⁇ arrives at the time without receiving the retransmission data, the eUE does not. Wait again, turn off the receiver, and go to sleep.
  • the start of the HARQ RTT timer takes into account that the UE and the eNB need to process the data frame for a certain period of time, and the retransmission of the data to the UE must occur after this period of time, allowing the UE to enter the sleep state during this period, which can save the power of the UE.
  • how to set the timing duration of the HARQ RTT Timer is to prevent the UE from waking up to monitor the PDCCH in advance, resulting in unnecessary power consumption, which is crucial for saving the UE power. Summary of the invention
  • Embodiments of the present invention provide a control method for a mobile communication terminal to receive downlink data in a TDD system and a mobile communication terminal, which are used to reduce power consumption of the mobile communication terminal.
  • a method for controlling downlink data reception by a mobile communication terminal includes the following steps: when receiving a downlink data transmission indication, starting a timer for monitoring an earliest arrival time of retransmission data of downlink data, where the timer is The timing duration is greater than or equal to T2, where T2 is equal to: a time difference between receiving the downlink data transmission indication and transmitting the first feedback information indicating whether the downlink data is correctly received, and adding a feedback indication that the repeated transmission correctly receives the downlink data.
  • T2 is equal to: a time difference between receiving the downlink data transmission indication and transmitting the first feedback information indicating whether the downlink data is correctly received, and adding a feedback indication that the repeated transmission correctly receives the downlink data.
  • the sum of the number of times of information and the product of one subframe duration, plus the sum of the feedback indication information transmitted between the mobile communication terminal and the base station and processed by the base station, and finally a subframe is added. The sum of the durations obtained; and
  • the receiver In the first downlink subframe after the timer duration of the timer arrives, if the mobile communication terminal is in a sleep state and data needs to be retransmitted, the receiver is turned on to wait for receiving retransmission data.
  • the receiving the downlink data transmission indication and transmitting the first one whether the downlink data is correctly received The time difference between the feed indication information is equal to: kxt, where: k represents the first feedback indication information for the downlink data transmitted for the nkth subframe, which will be transmitted in the nth subframe, where t is the duration of one subframe.
  • the feedback indication information is transmitted between the mobile communication terminal and the base station and processed by the base station for a duration of 3 subframes.
  • control unit configured to start the timer when receiving a downlink data transmission indication, and in a first downlink subframe after the timer duration of the timer arrives, if the mobile communication terminal is in a dormant state and data needs to be retransmitted, Then the receiver is turned on to wait for receiving retransmission data.
  • the ACK or NACK is repeatedly sent in the TDD system, and the timing duration of the HARQ RTT Timer is set to be less than or equal to the length of any single sub-frame duration between T1 and greater than or equal to T2, and can be guaranteed.
  • the power consumption of the mobile communication terminal is saved as compared with the manner of directly setting the HARQ RTT Timer timing duration in the non-repetitive ACK or NACK.
  • the DRX Retransmission Timer does not need to be set longer. The value further saves the power consumption of the UE. Even if the best implementation is not used, the timing of the DRX Retransmission Timer can be moderately extended according to the specific timing of the HARQ RTT Timer.
  • FIG. 1 is a schematic diagram of a principle of a DRX control mechanism of an existing mobile communication terminal
  • FIG. 2 is a schematic diagram of a downlink data receiving control principle of an existing mobile communication terminal
  • FIG. 3 is a schematic diagram of a specific example of a timing rule for setting a HARQ RTT Timer timer according to an embodiment of the present disclosure
  • Figure 4 is a schematic diagram showing the relationship between the uplink and downlink time slots in the TDD system
  • FIG. 5 is a schematic flowchart of a downlink data receiving control method for a mobile communication terminal according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of a mobile communication terminal according to an embodiment of the present invention. detailed description
  • the eNB performs a judgment after receiving the last ACK/NACK to decide whether to retransmit the data that failed to be transmitted or to transmit new data.
  • the mobile communication terminal starts the HARQ RTTTimer when receiving the downlink data transmission indication, and then according to whether the downlink data correctly receives consecutive uplink subframes after the downlink data is reached, according to the configured number of retransmissions, the multiple feedback to the base station is correct.
  • the eNB After receiving the indication information ACK or NACK of the downlink data, the eNB performs a decision after receiving the last ACK or NACK. If the decision result is NACK, the downlink data is retransmitted. Therefore, the HARQ RTT Timer optimal timing duration T1 is three parts. The sum of them is calculated according to the following formula:
  • t is the duration of a subframe
  • kt is: the time between when the mobile communication terminal receives the downlink data transmission indication and the feedback indication information of whether the first downlink data is correctly received.
  • T AN Rep is: the length of time that the mobile communication terminal sends an anti-angry indication information to the last feedback indication information
  • ⁇ t is: the time required for the feedback indication information transmitted by the mobile communication terminal to be transmitted between the mobile communication terminal and the base station and processed by the base station.
  • T ANRep is: the interval between the uplink subframes of the first and last feedback indication information sent by the mobile communication terminal.
  • the number of frames is increased by 2, that is, the number of all subframes spanned by the uplink subframe in which the mobile communication terminal transmits the first and last feedback indication information, including the uplink subframe in which the first and last feedback indication information is sent;
  • the uplink subframe in which the mobile communication terminal sends the last feedback indication information and the base station increase the number of subframes between the downlink subframes in which the data is retransmitted, and the ⁇ t in the prior art is 3 subframe lengths, that is, 3 ms.
  • the number of retransmissions according to the feedback indication information, the different ratio of the uplink and downlink time slots in one radio frame, the uplink subframe position in which the first feedback indication information is sent, and the feedback indication information The number of repeated transmissions is determined. According to the above factors, the length of T ANRep is different, for example:
  • the ratio of the uplink and downlink time slots in a radio frame of 5 ms is 3:1. If the number of retransmission attempts is 2, the location of the uplink subframe in which the first feedback indication information is sent is sent.
  • TANRep is equal to 2ms;
  • T ANRep is equal to 6ms
  • the first feedback finger is sent.
  • the location of the uplink subframe of the information is the fifth subframe, and the location of the uplink subframe that sends the last feedback indication information is the fourth subframe of the next next radio frame, and TANR ep is equal to 10 ms;
  • the location of the uplink subframe in which the first feedback indication information is sent is the third subframe, and the location of the uplink subframe in which the last feedback indication information is sent.
  • is equal to 41ms;
  • the seventh configuration relationship is taken as an example. If the number of retransmissions of the feedback indication information is 6, the location of the uplink subframe in which the first feedback indication information is sent is the fourth subframe, and the location of the uplink subframe in which the last feedback indication information is sent. For the 4th subframe of the next next radio frame, TANR ep is equal to l lms.
  • the method for calculating TANRep according to the other slot allocation relationship, the number of retransmissions, and the location of the uplink subframe in which the first feedback indication information is sent is exactly the same, and will not be described in detail herein.
  • the receiver can be activated in a certain subframe in advance, so the minimum timing duration T2 of the HARQ RTT Timer is calculated according to the following formula 3:
  • T2 kt+ Nt+ ⁇ t + 1 (3)
  • N is the number of repeated transmissions of the anti-angry indication information
  • t is the duration of one subframe.
  • the ACK or NACK is repeatedly sent in the TDD system, and the timing duration of the HARQ RTT Timer is set to be less than or equal to the length of any single sub-frame duration between T1 and greater than or equal to T2, and can be guaranteed.
  • the power consumption of the mobile communication terminal is saved as compared with the manner of directly setting the HARQ RTT Timer timing duration in the non-repetitive transmission ACK or NACK.
  • the DRX Retransmission Timer does not need to be set to a longer value, thereby further saving the UE power loss. Even if the best implementation is not used, the duration of the DRX Retransmission Timer can be moderately extended according to the specific timing of the HARQ RTT Timer.
  • a method for controlling downlink data reception by a mobile communication terminal in a TDD system includes:
  • Step S501 When receiving the downlink data transmission indication, start retransmission for monitoring downlink data According to the HARQ RTT Timer of the earliest arrival time, the timing of the HARQ RTT Timer is less than or equal to T1 and greater than or equal to T2;
  • Step S502 When the timing duration of the HARQ RTT Timer timer arrives, if the mobile communication terminal is in the sleep state, the receiver is turned on and waits to receive the retransmission data.
  • the embodiment of the present invention further provides a mobile communication terminal, including:
  • the receiver 602 is configured to receive downlink data.
  • the control unit 603 is configured to start the timer 601 when receiving the downlink data transmission indication, and when the timing of the timer 601 arrives, if the mobile communication terminal is in the sleep state, the receiver is turned on and waits to receive the retransmission data. .

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Description

移动通信终端接收下行数据的控制方法和移动通信终端 技术领域
本发明涉及移动通信技术, 特别涉及一种 TDD系统中的移动终端接收下 行数据的技术。 背景技术
非连续接收(Discontinuous Reception: DRX )功能允许用户设备 ( User Equipment: UE)在一定的条件下关闭接收机, 而不必一直侦听物理下行控制 信道( Physical Downlink Control Channel: PDCCH ), 从而达到节省 UE电量的 目的。
DRX的基本原理如下图 1所示, DRX周期由持续的 PDCCH侦听阶段 ( On Duration )和可能的休眠阶段 ( Opportunity for DRX )构成, On Duration阶段 和 Opportunity for DRX阶段长度的单位均为子帧数。 在 On Duration阶段, UE 必须持续侦听每一个包含 PDCCH的子帧, 以获取各子帧的上、 下行传输的资 源分配指示, 根据各子帧的资源分配指示确定基站分配给自己的上下行时频 率资源,并在所分配的时频资源上进行数据处理等。 UE在 Opportunity for DRX 阶段可能不需要持续侦听 PDCCH。
在 E-UTRAN ( Evolved Universal Terrestrial Radio Access Network, 演进 的通用陆地无线接入网) 系统中, 为了能在没有数据需要收发的时候节省 UE 的电池消耗, UE可以执行 DRX操作, 即暂时关闭接收机, 在与基站约定的时 间醒来监控相应的 PDCCH, 以便获知在休眠期间基站是否有数据需要发送给 UE。 DRX操作包括有一些设定的参数以及一些进行控制的定时器, 例如包括 的参数有 DRX周期(DRX Cycle ), 包括的定时器有持续时间段定时器(On Duration Timer ), DRX非活性定时器(DRX Inactivity Timer )等。 UE在 On Duration时段内监控 PDCCH,若没有监控到基站发送给自己的数据指示时,在 On Duration Timer定时器到期后, 即进行休眠状态。 若 UE在 On Duration时段 内监控 PDCCH获知有发送给自己的数据指示时,则启动 DRX Inactivity Timer, 如果在 DRX Inactivity Timer定时器到期前, PDCCH再次指示有数据传输给该 用户, DRX Inactivity Timer将重新启动; 只有当 DRX Inactivity Timer定时器和 On Duration定时器都到期, 该 UE才能进入休眠阶段. 因此, UE在 DR 周期中 的 On Duration—直保持激活( Active )状态, 而在 Opportunity for DRX阶段则 可能处于激活状态, 也可能处于休眠状态。
在 E-UTRAN ( Evolved Universal Terrestrial Radio Access Network, 演进 的通用陆地无线接入网) 系统中规定 DRX控制和混合自动重传 (Hybrid Automatic Repeat Request: HARQ )各自独立运行, 也就说, 在 HARQ中需要 进行下行数据重传时, LTE系统中的演进用户设备(eUE )将不管当前 DRX操 作的状态, 一定根据设定的 HARQ RTT ( Round Trip Time ) Timer启动接收机 侦听 PDCCH, 以准备接收下行重传数据。 除此之外, HARQ重传不会进一步 影响正常的 DRX操作。并且因为 LTE下行采用异步的 HARQ,所以现有 LTE R8 中还定义了与下行 HARQ数据传输控制相关的 DRX Retransmission Timer定时 器, 以使 eUE在一定时间内没有接收到重传数据时能够恢复到休眠状态, 关闭 接收机。
下面以 eUE在 On Duration阶段的一个子帧中, 通过侦听 PDCCH的资源分 配指示确定在 LTE系统中的演进基站(eNB )在该子帧内为 eUE分配了下行数 据传输资源为例, 详细说明 LTE版本 8 ( Release 8 ) 中 eUE执行 DRX与下行 HARQ的配合控制流程。
参见图 2所示, 以一个 DRX周期为例, 设 DRX周期为 20个子帧, 其中: 设 On Duration阶段长度为两个子帧, DRX Inactivity Timer长度为两个子帧,现有 标准规定,一个子帧的长度为 lms.如果在 On Duration阶段的第一个子帧, eUE 监听到 PDCCH指示下行传输,则下行数据的接收控制过程具体包括如下步骤:
S201、 eUE在当前 DRX周期的第一个子帧为对应的 HARQ过程启动第一定 时器, HARQ RTT ( Round Trip Time ) Timer定时器, 并处理下行数据; 同时, eUE启动 DRX Inactivity Timer; 5202、 eUE判断数据是否正确接收, 若正确接收, 则 eUE向 eNB反馈 ACK ( Acknowledgement ); 若下行数据没有正确接收, eUE向 eNB反馈 NACK ( Negative Acknowledgement );
5203、 当 HARQ RTT Timer的定时时长到达并且下行数据未被正确接收, 即 eUE向 eNB反馈 NACK时, eUE打开接收机, 结束休眠状态, 进入接收状态, 同时启动另一个定时器 DRX Retransmission Timer定时器。
DRX Retransmission Timer定时器的启动是为了监测接收重传数据的等待 时间, 防止 eNB误将 NACK解调为 ACK后不再进行数据重传时, eUE无限度地 等待,其长度根据需要的最大等待时长确定,由 eNB通过无线资源控制(Radio Resource Control: RRC )流程配置给 eUE。 在 DRX Retransmission Timer运行 期间, eUE如果正确接收到重传数据,则在接收数据完毕后关闭接收机进入到 休眠状态; 当 DRX Retransmission Timeri殳定时长到达都没有接收到重传数据 时, eUE则不再等待, 关闭接收机, 转入到休眠状态。
如果 eUE在 On Duration阶段没有侦听到 PDCCH上有发给自己的下行数据 指示, 那么 On Duration结束后 UE就关闭接收机, 进入休眠阶段; 若 UE在 On Duration时段内监控 PDCCH获知有发送给自己的数据指示时, 则启动 DRX Inactivity Timer, 如果在 DRX Inactivity Timer定时器到期前, PDCCH再次指示 有数据传输给该用户, DRX Inactivity Timer将重新启动;只有当 DRX Inactivity Timer定时器和 On Duration定时器都到期, 该 UE才能进入休眠阶段。 当 eUE 未能正确接收下行数据时, eUE还需要在 HARQ RTT Timer到期后打开接收机, 并且打开的最长时间等于 DRX Retransmission Timer的时长。
一般情况下, HARQ过程中都只反馈一次 ACK/NACK:。 有的时候当小区 覆盖半径较大, 处在小区边缘的用户反馈 ACK/NACK的可靠性就无法得到保 证, ACK/NACK错误会造成不必要的重传或者 HARQ的残留错误。 为了保证 边缘用户 ACK NACK的可靠性, LTE中采取了一种 ACK/NACK重复 (ACK/NACK Repetition)的机制, 即可以把相同的 ACK/NACK信号在多个连续 上行子帧中重复发送, eNB将收到的多个重复的 ACK/NACK信号合并之后再 进行判断, 这样可以大大降低 AC /NACK发生错误的概率。 ACK/NACK重复 次数可以用 NANRep表示, NANRep取值例如 2、 4、 6等。
HARQ RTT Timer的启动是考虑到 UE和 eNB处理数据帧需要一定的时间, 而重传数据到达 UE肯定发生在这段时间之后, 允许 UE在此期间进入休眠状 态, 可以节省 UE的电量。 在使用 ACK/NACK重复机制的情况下, 如何设置 HARQ RTT Timer的定时时长, 避免 UE提前醒过来监听 PDCCH, 造成了无谓 的电量消耗, 对于节省 UE电量则显得至关重要。 发明内容
本发明实施例提出一种 TDD系统中移动通信终端接收下行数据的控制方 法和移动通信终端, 用以降低移动通信终端的耗电量。
本发明实施例提出的一种移动通信终端接收下行数据的控制方法, 包括 步骤: 接收下行数据传输指示时, 启动用于监测下行数据的重传数据最早到 达时间的定时器, 所述定时器的定时时长大于等于 T2, 其中, T2等于: 接收 到下行数据传输指示和发送第一个是否正确接收下行数据的反馈指示信息之 间的时间差 , 加上重复发送是否正确接收所述下行数据的反馈指示信息的次 数与一个子帧持续时间的乘积所获得的和, 再加上反馈指示信息在移动通信 终端与基站之间传输并被基站处理所需时间后获得的和, 最后再加上一个子 帧持续时间获得的总和; 并
在所述定时器的定时时长到达后的第一个下行子帧, 如果移动通信终端 处于休眠状态且数据需要重传, 则打开接收机等待接收重传数据。
所述定时器的定时时长小于等于 Tl, 其中, T1等于: 接收到下行数据传 输指示和发送第一个是否正确接收下行数据的反馈指示信息之间的时间差, 加上发送第一个反馈指示信息至最后一个反馈指示信息所持续的时间长度获 得的和, 再加上反馈指示信息在移动通信终端与基站之间的传输并被基站处 理所需时间后获得的总和。
所述接收到下行数据传输指示和发送第一个是否正确接收下行数据的反 馈指示信息之间的时间差等于: k x t, 其中: k表示对于第 n-k个子帧发送的 下行数据的第一个反馈指示信息, 将在第 n个子帧发送, t是一个子帧的持续 时间长度。
所述发送第一个反馈指示信息至最后一个反馈指示信息所持续的时间长 度获得的和: 根据所述 TDD系统中, 一个无线帧的长度、 基站为移动通信终 端配置的一个无线帧中上下行时隙配比关系、 发送第一个反馈指示信息的上 行子帧位置, 以及反馈指示信息重复发送的次数确定。
所述反馈指示信息在移动通信终端与基站之间传输并被基站处理所需时 间为 3个子帧的持续时间。
本发明实施例提出的一种 TDD系统中的移动通信终端, 包括:
定时器, 用于监测下行数据的重传数据最早到达时间的定时器, 所述定 时器的定时时长大于等于 T2, 其中, Τ2等于: 接收到下行数据传输指示和 发送第一个是否正确接收下行数据的反馈指示信息之间的时间差, 加上重复 发送是否正确接收所述下行数据的反馈指示信息的次数与一个子帧持续时间 的乘积所获得的和, 再加上反馈指示信息在移动通信终端与基站之间传输并 被基站处理所需时间后获得的和, 最后再加上一个子帧持续时间获得的总和; 接收机, 用于接收下行数据;
控制单元, 用于接收到下行数据传输指示时启动所述定时器, 并在所述 定时器的定时时长到达后的第一个下行子帧, 如果移动通信终端处于休眠状 态且数据需要重传, 则打开所述接收机等待接收重传数据。
本发明实施例在 TDD系统中采用重复发送 ACK或 NACK,将 HARQ RTT Timer的定时时长设定为小于等于 T1和大于等于 T2之间的任何一个单个子帧 持续时间倍数的长度, 都可以在保证接收可能在最短时间道道的重传数据的 条件下 , 与直接采用不重复 ACK或 NACK中设定 HARQ RTT Timer定时时 长的方式相比, 节省了移动通信终端的电量损耗。
相应的, 在 DR 操作时, 如果采用了 ACK/NACK重复机制, 根据本发 明实施例提供的最佳技术方案,不需要将 DRX Retransmission Timer设置更长 的值,进一步节省了 UE的电量损耗, 即使不釆用最佳实施方案,也可以根据 HARQ RTT Timer的具体定时时长, 适度延长 DRX Retransmission Timer的定 时时长。 附图说明
图 1为现有移动通信终端的 DRX控制机制原理示意图;
图 2为现有移动通信终端的下行数据接收控制原理示意图;
图 3为本发明实施例提供的 HARQ RTT Timer定时器定时时长设定原理 具体示例示意图;
图 4为 TDD系统中上下行时隙配比关系示意图;
图 5为本发明实施例提供的移动通信终端下行数据接收控制方法流程示 意图;
图 6为本发明实施例提供的移动通信终端结构示意图。 具体实施方式
本发明实施例中, 考虑到 TDD系统中使用 ACK/NACK重复机制的情况 下, eNB在收到最后一个 ACK/NACK之后进行判断, 以决定是重传发送失败 的数据、 还是发送新数据。 由于移动通信终端在接收到下行数据传输指示时 启动 HARQ RTTTimer,然后根据下行数据是否正确接收在下行数据达到后的 连续几个上行子帧, 根据配置的重发次数, 向基站反馈多个是否正确接收下 行数据的指示信息 ACK或 NACK, eNB在收到最后一个 ACK或 NACK后进 行判决,如果判决结果为 NACK,则会重传下行数据,因此, HARQ RTT Timer 最佳定时时长 T1为三部分时间之和, 根据如下公式计算:
Tl= kt + TANRep+At ( 1 )
其中: t是一个子帧的持续时间长度, kt为: 移动通信终端接收到下行数 据传输指示和发送第一个是否正确接收下行数据的反馈指示信息之间的时间 差;
TANRep为:移动通信终端发送笫一个反愤指示信息至最后一个反馈指示信 息所持续的时间长度;
△ t 为: 移动通信终端发送的反馈指示信息在移动通信终端与基站之间 的传输并被基站处理所需时间。
如果以子帧个数为单位, 则 k为移动通信终端接收到下行数据传输指示 的下行子帧和发送第一个反馈指示信息的上行子帧之间间隔的子帧个数加 1, 即对于第 n-k个子帧发送的下行数据的第一个反馈指示信息,将在第 n个子帧 发送; TANRep为: 移动通信终端发送第一个和最后一个反馈指示信息的上行子 帧之间间隔的子帧个数加 2,也即移动通信终端发送第一个和最后一个反馈指 示信息的上行子帧所跨越的所有子帧数, 包括发送第一个和最后一个反馈指 示信息的上行子帧; At 为: 移动通信终端发送最后一个反馈指示信息的上 行子帧和基站如果重传数据的下行子帧之间间隔的子帧数加 1,现有技术中△ t 为 3个子帧长度, 即 3ms, 如公式 2所示:
Tl=kt+ TANRep+3 ms ( 2 )
如图 3所示, 以重发 4次 ACK或 NACK为例: Tl= 7+16+3=26ms。 如图 4所示, 在 TDD系统中, 根据反馈指示信息重发次数、 一个无线帧 中上下行时隙的不同配比关系、 发送第一个反馈指示信息的上行子帧位置, 以及反馈指示信息重复发送的次数确定,根据上述因素, TANRep的长度有所不 同, 例如:
第一种配置关系配置 0中一个无线帧中以 5ms为周期上下行时隙的配比 为 3:1, 如果反馈指示信息重发次数为 2, 发送第一反馈指示信息的上行子帧 所在位置为第 3个子帧, 则 TANRep等于 2ms;
仍是第一种配置关系,如果反馈指示信息重发次数为 4,发送第一反馈指 示信息的上行子帧所在位置为第 3个子帧, 发送最后一个反馈指示信息的上 行子帧所在位置为第 7个子帧, TANRep等于 6ms;
仍是第一种配置关系, 如果反馈指示信息重发次数为 6,发送第一反馈指 示信息的上行子帧所在位置为第 5个子帧, 发送最后一个反馈指示信息的上 行子帧所在位置为相邻下一个无线帧的第 4个子帧, TANRep等于 10ms;
再以第六种配置关系为例,如果反馈指示信息重发次数为 4,发送第一反 馈指示信息的上行子帧所在位置为第 3个子帧, 发送最后一个反馈指示信息 的上行子帧所在位置为后续第 4个无线帧的第 3个子帧, ΤΑΝΚ^等于 41ms;
还以第七种配置关系为例,如果反馈指示信息重发次数为 6,发送第一反 馈指示信息的上行子帧所在位置为第 4个子帧, 发送最后一个反馈指示信息 的上行子帧所在位置为相邻下一个无线帧的第 4个子帧, TANRep等于 l lms。
根据其他时隙配比关系、 重发次数以及发送第一反馈指示信息的上行子 帧所在位置计算 TANRep的方法完全相同, 这里不再一一详细描述。
当然, 为了进一步保证接收重传数据的可靠性, 还可以提前一定子帧激 活接收机, 因此 HARQ RTT Timer的最小定时时长 T2根据如下公式 3计算:
T2= kt+ Nt+厶 t + 1 (3)
其中: N为反愤指示信息的重复发送次数, t为一个子帧的持续时间。 本发明实施例在 TDD系统中采用重复发送 ACK或 NACK,将 HARQ RTT Timer的定时时长设定为小于等于 T1和大于等于 T2之间的任何一个单个子帧 持续时间倍数的长度, 都可以在保证接收可能在最短时间到达的重传数据的 条件下, 与直接采用不重复发送 ACK或 NACK中设定 HARQ RTT Timer定 时时长的方式相比, 节省了移动通信终端的电量损耗。
相应的, 在 DRX操作时, 如果采用了 ACK/NACK重复机制, 根据本发 明实施例提供的最佳技术方案,不需要将 DRX Retransmission Timer设置更长 的值, 进一步节省了的 UE电量损耗。 即使不采用最佳实施方案,也可以根据 HARQ RTT Timer的具体定时时长, 适度延长 DRX Retransmission Timer的定 时时长。
基于上述分析, 如图 5所示, 本发明实施例提供的一种 TDD系统中移动 通信终端接收下行数据的控制方法, 包括:
步骤 S501、 接收下行数据传输指示时, 启动用于监测下行数据的重传数 据最早到达时间的 HARQ RTT Timer定时器, HARQ RTT Timer定时器的定时 时长小于等于 T1大于等于 T2;
步骤 S502、 在 HARQ RTT Timer定时器的定时时长到达时, 如果移动通 信终端处于休眠状态, 则打开接收机等待接收重传数据。
如图 6所示, 本发明实施例还提供一种移动通信终端, 包括:
定时器 601,用于监测下行数据的重传数据到达时间, 定时时长小于等于 T1大于等于 T2;
接收机 602, 用于接收下行数据;
控制单元 603,用于在接收到下行数据传输指示时,启动所述定时器 601, 并在定时器 601 的定时时长到达时, 如果移动通信终端处于休眠状态, 则打 开接收机等待接收重传数据。
具体实现方法如前所述, 这里不再重复描述。
显然, 本领域的技术人员可以对本发明实施例进行各种改动和变型而不 脱离本发明的精神和范围。 这样, 倘若本发明的这些修改和变型属于本发明 权利要求及其等同技术的范围之内 , 则本发明也意图包含这些改动和变型在 内。

Claims

权 利 要 求
1、 一种 TDD系统中移动通信终端接收下行数据的控制方法, 其特征在 于, 包括:
接收下行数据传输指示时, 启动用于监测下行数据的重传数据最早到达 时间的定时器, 所述定时器的定时时长大于等于 T2, 其中, T2等于: 接收到 下行数据传输指示和发送第一个是否正确接收下行数据的反馈指示信息之间 的时间差, 加上重复发送是否正确接收所迷下行数据的反馈指示信息的次数 与一个子帧持续时间的乘积所获得的和, 再加上反馈指示信息在移动通信终 端与基站之间传输并被基站处理所需时间后获得的和, 最后再加上一个子帧 持续时间获得的总和; 并
在所述定时器的定时时长到达后的第一个下行子帧, 如果移动通信终端 处于休眠状态且数据需要重传, 则打开接收机等待接收重传数据。
2、 如权利要求 1所述的方法, 其特征在于, 所述定时器的定时时长小于 等于 Tl, 其中, T1等于: 接收到下行数据传输指示和发送第一个是否正确接 收下行数据的反馈指示信息之间的时间差, 加上发送第一个反馈指示信息至 最后一个反馈指示信息所持续的时间长度获得的和, 再加上反馈指示信息在 移动通信终端与基站之间的传输并被基站处理所需时间后获得的总和。
3、 如权利要求 1所述的方法, 其特征在于, 所述接收到下行数据传输指 示和发送第一个是否正确接收下行数据的反馈指示信息之间的时间差等于: k x t, 其中: k表示对于第 n-k个子帧发送的下行数据的第一个反馈指示信息, 将在第 n个子帧发送, t是一个子帧的持续时间长度,
4、 如权利要求 1至 3中任一权利要求所述的方法, 其特征在于, 所述发 送第一个反馈指示信息至最后一个反馈指示信息所持续的时间长度获得的 和: 根据所迷 TDD系统中, 一个无线帧的长度、 基站为移动通信终端配置的 一个无线帧中上下行时隙配比关系、 发送第一个反馈指示信息的上行子帧位 置, 以及反馈指示信息重复发送的次数确定。
5、 如权利要求 4所述的方法, 其特征在于, 所述反馈指示信息在移动通 信终端与基站之间传输并被基站处理所需时间为 3个子帧的持续时间。
6、 一种 TDD系统中的移动通信终端, 其特征在于, 包括:
定时器, 用于监测下行数据的重传数据最早到达时间的定时器, 所述定 时器的定时时长大于等于 T2, 其中, T2等于: 接收到下行数据传输指示和 发送第一个是否正确接收下行数据的反馈指示信息之间的时间差, 加上重复 发送是否正确接收所述下行数据的反馈指示信息的次数与一个子帧持续时间 的乘积所获得的和, 再加上反馈指示信息在移动通信终端与基站之间传输并 被基站处理所需时间后获得的和, 最后再加上一个子帧持续时间获得的总和; 接收机, 用于接收下行数据传输指示;
控制单元, 用于接收下行数据传输指示时启动所述定时器, 并在所述定 时器的定时时长到达后的第一个下行子帧, 如果移动通信终端处于休眠状态 且数据需要重传, 则打开所述接收机等待接收重传数据,
7、 如权利要求 6所述的移动通信终端, 其特征在于, 所述接收到下行数 据传输指示和发送第一个是否正确接收下行数据的反馈指示信息之间的时间 差等于: k x t, 其中: k表示对于第 n-k个子帧发送的下行数据的第一个反馈 指示信息, 将在第 n个子帧发送, t是一个子帧的持续时间长度。
8、 如权利要求 6或 7所述的移动通信终端, 其特征在于, 所述发送第一 个反馈指示信息至最后一个反馈指示信息所持续的时间长度获得的和: 根据 所述 TDD系统中, 一个无线帧的长度、 基站为移动通信终端配置的一个无线 帧中上下行时隙配比关系、 发送第一个反馈指示信息的上行子帧位置, 以及 反馈指示信息重复发送的次数确定。
9、 如权利要求 8所述的移动通信终端, 其特征在于, 所述反馈指示信息 在移动通信终端与基站之间传输并被基站处理所需时间为 3个子帧的持续时 间。
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