WO2010060261A1 - 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
WO2010060261A1
WO2010060261A1 PCT/CN2009/001170 CN2009001170W WO2010060261A1 WO 2010060261 A1 WO2010060261 A1 WO 2010060261A1 CN 2009001170 W CN2009001170 W CN 2009001170W WO 2010060261 A1 WO2010060261 A1 WO 2010060261A1
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Prior art keywords
time
timer
indication information
mobile communication
communication terminal
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PCT/CN2009/001170
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English (en)
French (fr)
Inventor
谢芳
胡臻平
崔春风
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China Mobile Communications Group Co Ltd
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China Mobile Communications Corp
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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
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1848—Time-out mechanisms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower using a pre-established activity schedule, e.g. traffic indication frame
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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 technique for a mobile terminal that receives discontinuous reception 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 constantly listening 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 shown in Figure 1.
  • the DRX period consists of the continuous PDCCH listening phase (On Duration) and the 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 continuously listen to the PDCCH to obtain the resource allocation indication of the uplink and downlink transmission of each subframe, and determine the uplink and downlink allocated by the base station to the base station according to the obtained resource allocation indication of the uplink and downlink transmission of each subframe. Time-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. Awakening at the time agreed with the base station to listen to the corresponding PDCCH, so as to know whether the base station needs to send data to the UE during the sleep phase.
  • the DRX operation includes some set parameters and some control timers.
  • the included parameters include a DRX cycle
  • the included timers include an On Duration Timer and a DR inactivity timer. DRX Inactivity Timer) and so on.
  • the UE listens to the PDCCH during the On Duration phase.
  • the UE enters the dormant phase after the On Duration Timer expires; if the UE listens during the On Duration phase
  • the PDCCH learns that there is a data indication sent to itself, and then starts the DRX Inactivity Timer. If the PDCCH again indicates that data is transmitted to the UE before the DRX Inactivity Timer expires, the DRX Inactivity Timer is restarted; only when the DRX Inactivity Timer and the On Duration are When the Timer expires, the UE can enter the sleep phase. Therefore, the UE remains in the Active state during the On Duration phase of the DRX cycle, and may be active or may be in the Sleep state during the Opportunity for DRX phase.
  • the DR control and the hybrid automatic repeat request (HARQ) are respectively operated independently, that is, the evolved user equipment (eUE) in the LTE system is required when downlink data retransmission is required in the HARQ.
  • the receiver Regardless of the state of the current DR operation, the receiver must be started to listen to the PDCCH according to the set HARQ RTT (Round Trip Time) Timer in preparation for receiving the downlink retransmission data.
  • HARQ does not further affect normal DRX operation.
  • the existing LTE Release 8 (Release 8, R8) also defines a DRX Retransmission Timer related to the downlink HARQ data transmission control, so that the eUE is in a certain time.
  • the receiver can be turned off and restored to the sleep state.
  • the following is an example of determining, by using the resource allocation indication of the PDCCH, that the evolved base station (eNB) in the LTE system allocates downlink data transmission resources for the eUE in the subframe, as described in the following example.
  • the eUE performs the cooperation control process between the DR and the downlink HARQ in the LTE R8.
  • the DRX cycle is 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 is lms. If the eUE detects the downlink data sent to itself in the first subframe of the On Duration phase, the receiving control process of the downlink data specifically includes the following steps:
  • the eUE starts a first timer, that is, a HARQ RTT Timer, in the first subframe of the current DRX cycle, and processes the downlink data; and the eUE starts the DRX Inactivity Timer; 5202, the eUE determines whether the downlink data is correctly received. If the eNB receives the ACK (Acknowledgement), if the downlink data is not received correctly, the eUE feeds back the NACK (Negative Acknowledgement) to the eNB;
  • ACK Acknowledgement
  • NACK Negative Acknowledgement
  • the purpose of the HARQ RTT Timer is to determine the minimum time interval before the possible retransmission data arrives.
  • the timing of the HARQ RTT Timer can only be less than or equal to the minimum time interval to ensure that the eUE receives the retransmission data when the receiver is in the receiving state.
  • the eUE receives and processes the downlink data, which generally takes 4 ms, that is, the 4th subframe after the first subframe of the current DR period may feed back ACK or NACK to the eNB, and the ACK or NACK arrives at the eNB for transmission delay and the eNB.
  • the sum of time for demodulating ACK or NACK is generally 4ms.
  • the minimum time interval is generally set to 8 ms, thereby ensuring that the receiver is turned on before the retransmission data arrives to ensure that the retransmission data can be received.
  • the eUE turns on the receiver, ends the sleep state, enters the receiving state, and starts another timer DRX Retransmission Timer.
  • the DRX Retransmission Timer is started to monitor the waiting time for receiving retransmission data.
  • the eNB prevents the eNB from demodulating the NACK into an ACK and then does not retransmit the data, the eUE waits indefinitely.
  • the timing length is determined according to the required maximum waiting duration.
  • the eNB is configured to the eUE through an adio Resource Control (RRC) procedure.
  • RRC adio Resource Control
  • the DRX Retransmission Timer if the eUE correctly receives the retransmitted data, the receiver turns off the receiver and enters the sleep state after receiving the data.
  • the DRX Retransmission Timer is set to receive no retransmission data, the eUE does not. Wait again, turn off the receiver, and go to sleep.
  • the eUE If the eUE does not detect the downlink data indication sent to itself on the PDCCH during the On Duration phase, the eUE turns off the receiver and enters the dormant phase after the On Duration phase ends; if the eUE listens to the PDCCH in the On Duration phase, the PDCCH is informed that there is a transmission.
  • the DRX Inactivity Timer is started. If the PDCCH again indicates that data is transmitted to the eUE before the DRX Inactivity Timer expires, the DRX Inactivity Timer is restarted; only when DRX When the Inactivity Timer and the On Duration Timer both expire, the eUE can enter the sleep phase.
  • the eUE fails to correctly receive downlink data, the eUE also needs to open the receiver after the HARQ RTT Timer expires, and the maximum time that is turned on is equal to the duration of the DRX Retransmission Timer.
  • the PDCCH refers to
  • Embodiments of the present invention provide a downlink data receiving control method and a mobile communication terminal, which are used to reduce power consumption of a mobile communication terminal.
  • a method for controlling downlink data reception by a mobile communication terminal includes: receiving downlink data and determining that downlink data is not correctly received, returning incorrect reception indication information to a base station, and starting to control receiving the downlink a timer for restarting data retransmission data;
  • the receiver When the timing of the timer arrives, if the mobile communication terminal is in the sleep state, the receiver is turned on to wait for reception of the retransmission data.
  • the timing duration of the timer is determined according to a minimum time interval between the start time of the start timer and the retransmission data arrival time of the downlink data.
  • the start time according to the start timer is The minimum time interval between the arrival times of the retransmission data of the downlink data determines the timing duration of the timer, including: the timing duration is less than or equal to the minimum time interval.
  • the minimum time interval is: the transmission delay of the incorrectly received indication information transmitted between the mobile communication terminal and the base station when the start time of the start timer is the same as the time of the incorrect reception indication information. And adding a sum obtained after the base station processes the time required to correctly receive the indication information;
  • the minimum time interval is: the transmission delay of the incorrectly received indication information transmitted between the mobile communication terminal and the base station, plus the time required by the base station to process the incorrectly received indication information, the timer start time, and the incorrect Receiving the sum obtained after the time difference between the transmission times of the indication information;
  • the minimum time interval is: a transmission delay of the incorrectly received indication information transmitted between the mobile communication terminal and the base station, plus The value obtained by the upper base station processing the sum obtained by the time required to correctly receive the indication information, and subtracting the time difference between the timer start time and the time when the indication information transmission time is not correctly received.
  • the transmission delay of the incorrectly received indication information transmitted between the mobile communication terminal and the base station, plus the time required by the base station to process the incorrect reception of the indication information is: 4 milliseconds.
  • a mobile communication terminal including a transmitter, further comprising:
  • a timer configured to control a startup time of receiving retransmission data
  • a receiver configured to receive downlink data, and determine that the downlink information is not correctly received, and output the first indication information
  • control unit configured to return, according to the first indication information output by the receiver, the incorrect reception indication information to the base station by using the transmitter, and start the timer, and if the timing duration of the timer arrives, if When the mobile communication terminal is in the dormant state, the receiver is turned on to wait for receiving the retransmission data of the downlink data.
  • the downlink data receiving control method and the mobile communication terminal provided by the embodiments of the present invention start a timer for monitoring a minimum time interval before the arrival of the possible retransmission data, after receiving the downlink data and determining that the data is not correctly received, to avoid
  • the timer is started when the data has been correctly received, thereby greatly reducing the number of timer starts and avoiding additional power consumption. Further, since the start time of the timer is the time for transmitting the NACK, the set duration of the timer can be reduced, thereby further reducing the running time of the timer, thereby further reducing the power loss of the eUE.
  • DRAWINGS 1 is a schematic diagram of a DRX control mechanism of a mobile communication terminal in the prior art; FIG.
  • FIG. 2 is a schematic diagram of a downlink data reception control principle of a mobile communication terminal in the prior art
  • FIG. 3 is a schematic diagram of a downlink data reception control principle of a mobile communication terminal according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a mobile communication terminal according to an embodiment of the present invention.
  • the embodiment of the present invention provides the following technical solution:
  • the eUE starts the timer for controlling the retransmission data reception only after the NACK is fed back to the eNB, thereby avoiding the timer start after receiving the downlink data correctly, thereby saving The power consumption of the eUE.
  • the DRX cycle is set to 20 subframes.
  • the On Duration phase is two subframes. If the eUE detects the downlink data in the first subframe of the On Duration phase, the receiving control process of the downlink data specifically includes the following steps:
  • the S30K eUE receives the downlink data, and determines whether the downlink data is correctly received. If the data is correctly received, the eUE feeds back the ACK to the eNB; if the downlink data is not received correctly, the eUE feeds back the NACK to the eNB;
  • the eUE may not feed back any information to the eNB, and only feed back the NACK to the eNB when the eNB does not receive the correct information, so that the default data has been correctly received when the eNB does not receive any feedback information of the eUE. And retransmit the data when the NACK is received.
  • the eUE starts a timer for the corresponding HARQ process when the NACK is fed back to the eNB, and is used by the eNB to process an eNB Processing Timer according to an embodiment of the present invention
  • the role of the eNB processing delay timer is still to monitor the minimum time interval before the retransmission data arrives.
  • the eNB processing delay timer must be less than or equal to the minimum time interval to ensure that the receiver is turned on before the retransmission data arrives.
  • the eNB processes the timing duration of the delay timer, if the eUE is in the dormant state, the eUE needs to turn on the receiver to end the sleep state, and wait to receive the retransmission data.
  • the eUE starts the timer at the same time as the NACK, for example, the same subframe or the same millisecond (ms), or different, as long as the timer is less than or equal to the timer:
  • the start time and the time interval between the earliest possible arrival time of the retransmission data of the downlink data is the minimum time interval before the retransmission data arrives.
  • the timer must expire before the retransmission data arrives or just arrives, thereby triggering the eUE to open the reception. machine.
  • the minimum time interval is exactly: the transmission delay of the incorrect reception indication information NACK between the mobile communication terminal and the base station, plus the time required for the base station to process the NACK After the sum obtained.
  • the minimum time interval should be correspondingly added to the time difference between the timer start time and the NACK transmission time. Otherwise, when the timer start time is later than the NACK transmission time, The minimum time interval should be the value obtained by subtracting the time difference between the timer start time and the NACK transmission time.
  • the receiver If the eUE receives the retransmitted data during the DRX Retransmission Timer, the receiver is turned off and then enters the sleep state after receiving the retransmitted data; if the eUE does not receive the retransmitted data during the DRX Retransmission Timer, the DRX Retransmission Timer When the set time is reached, the receiver is turned off and goes to sleep again.
  • the DRX Inactivity Timer has not expired when the DRX Retransmission Timer expires, the eUE needs to shut down the receiver and enter the sleep state again when the DRX Inactivity Timer expires.
  • the eNB does not start the delay timer, thereby reducing the number of timer starts and avoiding additional power. Consumption. Especially in an environment with good communication conditions, the probability of data retransmission is very low, and the power consumption of the eUE is greatly saved.
  • the minimum time interval includes the sum of the following three parts: eUE receives the time required to process the downlink data, the transmission delay of the ACK or NACK sent by the eUE to the eNB, and the eNB solution
  • the time required to process and process the ACK or NACK, and the maximum duration of the first timer can only be the minimum time interval. Otherwise, it is possible to miss the retransmission data when the receiver is turned on.
  • the minimum time interval is generally 8 ms, so the maximum duration of the first timer is set to 8 ms. As shown in FIG.
  • the start time of the eNB processing the delay timer is the time for sending the NACK. Therefore, when the eNB processes the maximum duration of the delay timer, only the eUE needs to be considered.
  • the sum of the two parts of time is substantially equal to the time required for the eUE to receive the processed downlink data, so the transmission delay of the ACK or NACK and the eNB
  • the sum of the time required to demodulate the ACK or the NACK is set to be 4 ms when the eNB processes the delay timer, for example, 4 ms, thereby further reducing the running time of the timer, thereby further saving the power loss of the eUE.
  • the maximum duration of the eNB processing delay timer may also be set to 3 ms or 2 ms.
  • the above analysis of the prior art is based on the fact that the eUE can obtain the uplink resource that sends the NACK feedback information to the eNB after determining that the downlink data is not correctly received, so that the NACK feedback information is successfully sent, according to the duplex mode of the FDD system, in the FDD.
  • the eUE determines that the downlink number is not correctly received, there may be no uplink resources available immediately for feedback NACK. This causes the length of the DRX Retransmission Timer to be set long enough to ensure that the eNB schedules retransmission of eUE during the DRX Retransmission Timer.
  • the eUE may not receive the retransmitted data in the thousands of hours after the receiver is turned on, which causes unnecessary power consumption.
  • this also means that the eNB must schedule the downlink retransmission data sent to the eUE within the remaining time of the DRX Retransmission Timer, which will reduce the flexibility of the eNB scheduling and cause the eUE to not use the smaller DRX Retransmission Timer duration.
  • Such as lms, 2ms, etc. and must use larger values such as 16ms, 24ms, 33ms, etc., which further reduces the power saving function of the DRX mechanism.
  • the start time of the eNB processing delay timer is The time when the NACK is sent. Therefore, when the eNB processes the maximum duration of the delay timer, it does not need to consider the downlink transmission and the corresponding uplink ACK or NACK feedback information caused by the difference between the TDD uplink and downlink slot ratio and the used downlink subframe.
  • the difference between the delays only needs to consider the transmission delay of the NACK sent by the eUE to the eNB and the time required for the eNB to demodulate the NACK, thereby further reducing the running time of the timer in the TDD system and improving the scheduling retransmission of the eNB.
  • the flexibility of the data is The flexibility of the data.
  • an embodiment of the present invention further provides a mobile communication terminal, including a transmitter 403, and further includes:
  • a timer 401 configured to control a start time of receiving retransmission data, where a timing of the timer 401 is determined according to a minimum time interval between a start time of the start timer 401 and a retransmission data arrival time of the downlink data;
  • the receiver 402 is configured to receive downlink data, and determine that the downlink information is not correctly received, and output the first indication information;
  • the control unit 404 is configured to: according to the first indication information output by the receiver 402, return the incorrect reception indication information to the base station by the transmitter 403 and start the timer 401, and when the timing duration of the timer 401 arrives, if the mobile communication terminal arrives When in the sleep state, the receiver 402 is turned on to wait for receiving retransmission data of the downlink data.
  • the receiver 402 is further configured to output the second indication information when the downlink data is correctly received.
  • the control unit 404 is further configured to return the correct reception indication information to the base station by using the transmitter 403 according to the second indication information output by the receiver.
  • the timer duration of the timer 401 is less than or equal to the minimum time interval before the retransmission data arrives.
  • the minimum time interval is: the transmission delay of the indication information transmitted between the mobile communication terminal and the base station is not correctly received, and the base station is added. The sum obtained after processing the time required to receive the indication information correctly.
  • the transmission of the indication information between the mobile communication terminal and the base station is not correctly received.
  • the delay, plus the time taken by the base station to process the time when the indication information is not correctly received, is: 4 milliseconds.
  • the downlink data receiving control method and the mobile communication terminal provided by the embodiments of the present invention start a timer for monitoring the retransmission data receiving time only after receiving the downlink data and determining that the number is not correctly received. The timer is started when the data has been correctly received, thereby greatly reducing the number of timer starts and avoiding additional power consumption.
  • the start time of the timer is the time for transmitting the NACK
  • the set duration of the timer can be reduced, thereby further reducing the running time of the timer, thereby further reducing the power loss of the eUE.
  • the eUE is prevented from opening the receiver in advance to wait for receiving retransmission data, and the flexibility of the eNB to schedule retransmission data is improved.

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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， 特别涉及一种非连续接收的移动终端接收下 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 PDCCH, 以获取各子帧的上、 下行传输的资源分配指示， 根据获取的各子帧的上、 下行传输的资源分配指示确定基站分配给自己的上 下行时频资源， 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 时间醒来侦听相应的 PDCCH, 以便获知在休眠阶段基站是否有数据需要发送 给 UE。 DRX操作包括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 )、 DR 非活性定时器（DRX Inactivity Timer )等。 UE在 On Duration阶段内侦听 PDCCH, 若没有侦听到基站发送给自己的数据指示， 则 在 On Duration Timer到期后进入休眠阶段； 若 UE在 On Duration阶段内侦听 PDCCH获知有发送给自己的数据指示， 则启动 DRX Inactivity Timer , 如果在 DRX Inactivity Timer到期前， PDCCH再次指示有数据传输给该 UE, 则重新 启动 DRX Inactivity Timer; 只有当 DRX Inactivity Timer和 On Duration Timer 都到期时，该 UE才能进入休眠阶段。因此， UE在 DRX周期中的 On Duration 阶段一直保持激活（ 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系统中规定 DR 控制和混合自动重传（Hybrid Automatic Repeat Request: HARQ )各自独立运行， 也就是说， 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 DR 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版本 8 ( Release 8, R8 )中还定义了与下行 HARQ数据传输控制相关的 DRX重传定 时器（DRX Retransmission Timer ), 以使 eUE在一定时间内没有接收到重传 数据时能够关闭接收机， 恢复到休眠状态。
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 R8中 eUE执行 DR 与下行 HARQ的配 合控制流程。
参见图 2所示，以一个 DR 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 侦听到发给自己的下行数据 , 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， 即 HARQ RTT Timer, 并处理下行数据； 同时， eUE 启动 DRX Inactivity Timer; 5202、 eUE判断下行数据是否正确接收， 若正确接收， 则 eUE向 eNB反 馈 ACK ( Acknowledgement ); 若下行数据没有正确接收， 则 eUE向 eNB反 馈 NACK ( Negative Acknowledgement );
HARQ RTT Timer的目的在于确定可能的重传数据到达前的最小时间间 隔， HARQ RTT Timer的定时时长只能小于等于该最小时间间隔， 以确保 eUE 在重传数据到达时接收机处于接收状态。 现有技术中， eUE接收并处理下行 数据一般需要 4ms, 即在当前 DR 周期第一个子帧之后的第 4个子帧可能向 eNB反馈 ACK或 NACK, ACK或 NACK到达 eNB的传输时延和 eNB解调 ACK或 NACK的时间总和一般为 4ms, 这样， 即使 eNB解调出 NACK并马 上调度重传数据， 则重传数据最快会在第一个子帧之后的第 8个子帧下发给 eUE, 因此，设定 HARQ RTT Timer的定时时长时， 最小时间间隔一般设定为 8ms, 从而确保在重传数据到达前打开接收机， 以保证重传数据能够被接收。
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。
DRX Retransmission Timer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， 其定时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 ( adio 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 Timer设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阶段结束后 eUE就关闭接收机， 进入休眠阶段； 若 eUE在 On Duration阶段内侦听 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到期前， PDCCH再 次指示有数据传输给该 eUE, 则重新启动 DRX Inactivity Timer; 只有当 DRX Inactivity Timer和 On Duration Timer都到期时， 该 eUE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。
但是， 本发明人发现， 目前 DRX与下行 HARQ配合机制中， 在 PDCCH指
Timer, 实际上， 当 eUE正确接收下行数据并向 eNB反馈 ACK时， 不会引发下 行数据的重传，因此 eUE在这种情况下启动 HARQ RTT Timer并没有任何意义， 反而造成了不必要的电量浪费。 发明内容
本发明实施例提供一种下行数据接收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。
本发明实施例提供的一种移动通信终端接收下行数据的控制方法， 包括： 接收下行数据并确定下行数据未被正确接收时， 向基站返回未正确接收 指示信息并启动用于控制接收所述下行数据的重传数据的启动时间的定时 器；
在所述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。
其中， 所述定时器的定时时长根据所述启动定时器的启动时间和该下行 数据的重传数据到达时间之间的最小时间间隔确定； 较佳地， 所述根据启动 定时器的启动时间和该下行数据的重传数据到达时间之间的最小时间间隔确 定定时器的定时时长， 包括： 所述定时时长小于等于所述最小时间间隔。
其中， 当所述启动定时器的启动时间和未正确接收指示信息的发送时间 相同时， 所述最小时间间隔为： 所述未正确接收指示信息在移动通信终端与 基站之间传输的传输时延， 加上基站处理所述未正确接收指示信息所需时间 后获得的和；
当所述启动定时器的启动时间早于未正确接收指示信息的发送时间时， 所述最小时间间隔为： 所述未正确接收指示信息在移动通信终端与基站之间 传输的传输时延， 加上基站处理所述未正确接收指示信息所需时间、 定时器 启动时间和未正确接收指示信息发送时间之间的时间差后获得的和；
当所述启动定时器的启动时间晚于未正确接收指示信息的发送时间时， 所述最小时间间隔为： 所述未正确接收指示信息在移动通信终端与基站之间 传输的传输时延， 加上基站处理所述未正确接收指示信息所需时间获得的和， 再减去定时器启动时间和未正确接收指示信息发送时间之间的时间差后获得 的值。
较佳地， 所述未正确接收指示信息在移动通信终端与基站之间传输的传 输时延，加上基站处理所述未正确接收指示信息所需时间后获得的和为： 4毫 秒。
一种移动通信终端， 包括发送机， 还包括：
定时器， 用于控制接收重传数据的启动时间；
接收机， 用于接收下行数据， 确定下行数据未被正确接收时输出第一指 示信息；
控制单元， 用于根据所述接收机输出的第一指示信息， 通过所述发送机 向基站返回未正确接收指示信息并启动所述定时器， 以及在所述定时器的定 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所 述下行数据的重传数据。
本发明实施例提供的下行数据接收控制方法和移动通信终端， 只有在当 接收下行数据并判断数据未被正确接收后启动用于监测可能的重传数据到达 前的最小时间间隔的定时器， 避免了数据已经正确接收的情况下启动该定时 器， 从而大大减少了定时器的启动次数， 避免了额外的电能消耗。 进一步由 于定时器的启动时间为发送 NACK的时间，因此可以减少定时器的设定时长， 从而进一步减少了定时器的运行时间， 也就进一步降低了 eUE的电能损耗。 附图说明 图 1为现有技术中移动通信终端的 DRX控制机制原理示意图； 图 2为现有技术中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移动通信终端下行数据接收控制原理示意图； 图 4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
本发明实施例为减少 eUE的电能损耗， 提供如下技术方案： eUE只有在 向 eNB反馈 NACK之后， 才启动控制重传数据接收的定时器， 避免了正确接 收下行数据后的定时器启动， 从而节省了 eUE的电能消耗。
下面参见图 3所示 ,仍以一个 DRX周期并设 DRX周期为 20个子帧为例， 其中： On Duration阶段长度为两个子帧。如果在 On Duration阶段的第一个子 帧， eUE侦听到下行数据， 则下行数据的接收控制过程具体包括如下步骤：
S30K eUE接收下行数据， 判断下行数据是否正确接收， 若正确接收， 则 eUE向 eNB反馈 ACK; 若下行数据没有正确接收， 则 eUE向 eNB反馈 NACK;
需要说明的是， eUE判断下行数据正确接收后， 也可以不向 eNB反馈任 何信息， 仅在没有正确接收时向 eNB反馈 NACK, 这样 eNB没有收到 eUE 的任何反馈信息时默认数据已经被正确接收，而在接收到 NACK时重传数据。
S302、 eUE在向 eNB反馈 NACK时， 为对应的 HARQ过程启动定时器， 本发明实施例称之为 eNB处理时延定时器（ eNB Processing Timer );
eNB 处理时延定时器的作用仍是监测重传数据到达前的最小时间间隔， eNB 处理时延定时器的定时时长必须小于或等于该最小时间间隔， 以保证在 重传数据到达前打开接收机， 当 eNB处理时延定时器的定时时长到达时， 如 果 eUE处于休眠状态， 则 eUE需要打开接收机结束休眠状态， 等待接收重传 数据。
eUE启动定时器的时间可以和发送 NACK的时间相同， 例如同一子帧或 者同一毫秒（ms ), 也可以不同， 只要该定时器的定时时长小于等于： 定时器 的启动时间和该下行数据的重传数据最早可能到达时间之间的时间间隔。 重 传数据最早可能到达时间和定时器的启动时间之间的时间间隔为重传数据到 达前的最小时间间隔， 定时器必须在重传数据到达前或正好到达时到期， 从 而触发 eUE打开接收机。
当定时器的启动时间和 NACK的发送时间相同时，最小时间间隔恰好为： 所述未正确接收指示信息 NACK在移动通信终端与基站之间传输的传输时 延， 加上基站处理 NACK 所需时间后获得的和。 当定时器的启动时间早于 NACK 的发送时间时， 最小时间间隔应该相应再加上定时器启动时间和 NACK发送时间之间的时间差， 反之当定时器的启动时间晚于 NACK的发送 时间时， 最小时间间隔应该是再减去定时器启动时间和 NACK发送时间之间 的时间差后获得的值。
以下以定时器的启动时间和 NACK的发送时间相同为较佳实施例进行详 细说明。
S303 , 当 eNB处理时延定时器的定时时长到达时， 如果 eUE处于休眠状 态， 则 eUE打开接收机结束休眠状态， 进入重传数据的接收状态， 同时启动 另一个定时器 DRX Retransmission Timer。
若 eUE在 DRX Retransmission Timer运行期间接收到重传数据， 则在接 收完重传数据后关闭接收机再次进入休眠状态；若 eUE在 DRX Retransmission Timer运行期间没有接收到重传数据， 则在 DRX Retransmission Timer设定时 长到达后关闭接收机再次进入休眠状态。 当然， 如果在 DRX Retransmission Timer到期时， DRX Inactivity Timer还未到期， 则 eUE需要在 DRX Inactivity Timer到期时才能关闭接收机再次进入休眠状态。
这样， 在 eUE接收下行数据并判断数据被正确接收后， 由于后期的数据 重传不会发生， 因此并不启动 eNB处理时延定时器， 从而减少了定时器的启 动次数， 避免了额外的电能消耗。 特别是在通信条件良好的环境中， 数据重 传发生的几率很低， 更是大大节省了 eUE的电能消耗。
进一步参见图 2可见， 现有技术设定第一定时器的定时时长时， 需要考 虑可能的重传数据到达前的最小时间间隔， 该最小时间间隔包括以下三部分 时间之和： eUE接收处理下行数据所需时间、 eUE发送给 eNB的 ACK或 NACK 的传输时延、 以及 eNB解调并处理 ACK或 NACK所需时间， 且第一定时器 最大时长只能是最小时间间隔， 否则， 打开接收机时就有可能错过重传数据。 现有技术中最小时间间隔一般为 8ms， 因此将第一定时器的最大时长设定为 8ms。 而参见图 3可见， 采用本发明实施例提供的技术方案后， 由于 eNB处 理时延定时器的启动时间为发送 NACK的时间， 因此设定 eNB处理时延定时 器最大时长时， 只需要考虑 eUE发送给 eNB的 NACK的传输时延和 eNB解 调 NACK所需时间， 通常地， 这两部分时间之和基本等于 eUE接收处理下行 数据所需时间，所以根椐 ACK或 NACK的传输时延和 eNB解调 ACK或 NACK 所需时间之和设定 eNB处理时延定时器最大时长时， 例如为 4ms, 从而进一 步减少了定时器的运行时间， 也就进一步节省了 eUE的电能损耗。 当然， 也 可以将 eNB处理时延定时器的最大时长设定为 3ms或 2ms等。
上述对现有技术进行分析的基础是 eUE在判定没有正确接收下行数据 后， 即可获得向 eNB发送 NACK反馈信息的上行资源，从而成功发送 NACK 反馈信息， 根据 FDD系统的双工方式， 在 FDD系统中没有任何问题， 但是 在 TDD系统.中， 由于存在 7种不同的上下行时隙配比， eUE判定没有正确接 收下行数椐后， 有可能并没有马上可用的上行资源， 用于反馈 NACK, 这就 造成了必须将 DRX Retransmission Timer的时长设定的足够长，才能保证 eNB 在 DRX Retransmission Timer运行期间内调度 eUE的重传数据。 因此现有技 术对于 TDD系统，必须考虑到 eUE在打开接收机之后的若千时间内都可能没 有收到重传数据，这就造成了无谓的耗电。同时，这也意味着 eNB必须在 DRX Retransmission Timer剩下的时间内调度发送给该 eUE的下行重传数据 , 这将 降低 eNB调度的灵活性， 并导致 eUE不能使用较小的 DRX Retransmission Timer时长， 如 lms， 2ms等， 而必须采用如 16ms, 24ms, 33ms等较大的数 值，从而进一步导致 DRX机制的省电功能被大打折扣。 而采用本发明实施例 提供的技术方案后，在 TDD系统中， 由于 eNB处理时延定时器的启动时间为 发送 NACK的时间， 因此设定 eNB处理时延定时器最大时长时， 不必考虑由 于 TDD上下行时隙配比和所使用的下行子帧的不同所导致的下行传输与相应 上行 ACK或 NACK反馈信息之间时延的不同， 只需要考虑 eUE发送给 eNB 的 NACK的传输时延和 eNB解调 NACK所需时间， 因而在 TDD系统中进一 步减少了定时器的运行时间， 并提高了 eNB调度重传数据的灵活性。
本发明实施例以一次下行数据的接收控制为例详细说明了技术方案， 事 实上， 每一次下行数据的接收控制过程完全相同。
如图 4所示， 本发明实施例还提供一种移动通信终端， 包括发送机 403， 还包括：
定时器 401， 用于控制接收重传数据的启动时间，该定时器 401的定时时 长根据启动定时器 401 的启动时间和下行数据的重传数据到达时间之间的最 小时间间隔确定；
接收机 402， 用于接收下行数据，确定下行数据未被正确接收时输出第一 指示信息；
控制单元 404， 用于根据接收机 402输出的第一指示信息， 通过发送机 403向基站返回未正确接收指示信息并启动定时器 401， 以及在定时器 401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 402等待 接收该下行数据的重传数据。
进一步，'接收机 402还用于确定下行数据被正确接收时输出第二指示信 息； 控制单元 404还用于根据接收机输出的第二指示信息， 通过发送机 403 向基站返回正确接收指示信息。
根据前述， 定时器 401 的定时时长小于等于重传数据到达前的最小时间 间隔。
其中， 当所述启动定时器的启动时间和未正确接收指示信息的发送时间 相同时， 最小时间间隔为： 未正确接收指示信息在移动通信终端与基站之间 传输的传输时延， 加上基站处理未正确接收指示信息所需时间后获得的和。
较佳地， 未正确接收指示信息在移动通信终端与基站之间传输的传输时 延， 加上基站处理所述未正确接收指示信息所需时间后获得的和为： 4毫秒。 综上所述， 本发明实施例提供的下行数据接收控制方法和移动通信终端， 只有在当接收下行数据并判断数椐未被正确接收后启动用于监测重传数据接 收时间的定时器， 避免了数据已经正确接收的情况下启动该定时器， 从而大 大减少了定时器的启动次数， 避免了额外的电能消耗。 进一步由于定时器的 启动时间为发送 NACK的时间， 因此可以减少定时器的设定时长， 从而进一 步减少了定时器的运行时间， 也就进一步降低了 eUE的电能损耗。 并在 TDD 系统中避免 eUE提前打开接收机等待接收重传数据， 同时提高了 eNB调度重 传数据的灵活性。
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： 接收下行数据并确定下行数椐未被正确接收时， 向基站返回未正确接收 指示信息并启动用于控制接收所述下行数据的重传数据的启动时间的定时 器；
在所述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。
2、 如权利要求 1所述的控制方法， 其特征在于， 所述定时器的定时时长 根据所述启动定时器的启动时间和该下行数据的重传数据到达时间之间的最 小时间间隔确定。
3、 如权利要求 2所述的控制方法， 其特征在于， 所述根据启动定时器的 启动时间和该下行数据的重传数据到达时间之间的最小时间间隔确定定时器 的定时时长， 包括： 所述定时时长小于等于所述最小时间间隔。
4、 如权利要求 3所述的控制方法， 其特征在于， 当所迷启动定时器的启 动时间和未正确接收指示信息的发送时间相同时， 所述最小时间间隔为： 所 述未正确接收指示信息在移动通信终端与基站之间传输的传输时延， 加上基 站处理所述水正确接收指示信息所需时间后获得的和；
当所述启动定时器的启动时间早于未正确接收指示信息的发送时间时， 所述最小时间间隔为： 所述未正确接收指示信息在移动通信终端与基站之间 传输的传输时延， 加上基站处理所述未正确接收指示信息所需时间、 定时器 启动时间和未正确接收指示信息发送时间之间的时间差后获得的和；
当所述启动定时器的启动时间晚于未正确接收指示信息的发送时间时， 所述最小时间间隔为： 所述未正确接收指示信息在移动通信终端与基站之间 传输的传输时延， 加上基站处理所述未正确接收指示信息所需时间获得的和， 再减去定时器启动时间和未正确接收指示信息发送时间之间的时间差后获得 的值。
5、 如权利要求 4所述的控制方法， 其特征在于， 所述未正确接收指示信 息在移动通信终端与基站之间传输的传输时延， 加上基站处理所述未正确接 收指示信息所需时间后获得的和为： 4毫秒。
6、 一种移动通信终端， 包括发送机， 其特征在于， 还包括：
定时器，.用于控制接收重传数椐的启动时间；
接收机， 用于接收下行数据， 确定下行数据未被正确接收时输出第一指 示信息；
控制单元， 用于根据所述接收机输出的第一指示信息， 通过所述发送机 向基站返回未正确接收指示信息并启动所述定时器， 以及在所述定时器的定 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所 述下行数据的重传数据。
7、 如权利要求 6所述的移动通信终端， 其特征在于， 所述定时器的定时 时长根据所述启动定时器的启动时间和该下行数据的重传数据到达时间之间 的最小时间间隔确定。
8、 如权利要求 7所述的移动通信终端， 其特征在于， 所述定时器的定时 时长小于等于所述最小时间间隔。
9、 如权利要求 8所述的移动通信终端， 其特征在于， 当所述启动定时器 的启动时间和未正确接收指示信息的发送时间相同时， 所述最小时间间隔为： 所述未正确接收指示信息在移动通信终端与基站之间传输的传输时延， 加上 基站处理所述未正确接收指示信息所需时间后获得的和；
当所述启动定时器的启动时间早于未正确接收指示信息的发送时间时， 所述最小时间间隔为： 所述未正确接收指示信息在移动通信终端与基站之间 传输的传输时延， 加上基站处理所述未正确接收指示信息所需时间、 定时器 启动时间和未正确接收指示信息发送时间之间的时间差后获得的和；
当所述启动定时器的启动时间晚于未正确接收指示信息的发送时间时， 所述最小时间间隔为： 所述未正确接收指示信息在移动通信终端与基站之间 传输的传输时延， 加上基站处理所述未正确接收指示信息所需时间获得的和， 再减去定时器启动时间和未正确接收指示信息发送时间之间的时间差后获得 的值。
10、 如权利要求 9所述的移动通信终端， 其特征在于， 所述未正确接收 指示信息在移动通信终端与基站之间传输的传输时延， 加上基站处理所述未 正确接收指示信息所需时间后获得的和为： 4毫秒。
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