WO2009140926A1 - 一种下行数据调度方法和装置 - Google Patents

一种下行数据调度方法和装置 Download PDF

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Publication number
WO2009140926A1
WO2009140926A1 PCT/CN2009/071917 CN2009071917W WO2009140926A1 WO 2009140926 A1 WO2009140926 A1 WO 2009140926A1 CN 2009071917 W CN2009071917 W CN 2009071917W WO 2009140926 A1 WO2009140926 A1 WO 2009140926A1
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WIPO (PCT)
Prior art keywords
downlink
feedback
downlink data
scheduling
measurement gap
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PCT/CN2009/071917
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English (en)
French (fr)
Inventor
李国庆
谌丽
房家奕
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大唐移动通信设备有限公司
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Publication of WO2009140926A1 publication Critical patent/WO2009140926A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/535—Allocation or scheduling criteria for wireless resources based on resource usage policies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a downlink data scheduling method and apparatus. Background of the invention
  • the base station (eNB) allocates time-frequency resources for carrying data and transmits control channel information, and the terminal (User Equipment, UE) receives according to the control channel information of the base station. Downstream data or send uplink data.
  • eNB evolved Node B
  • UE User Equipment
  • the base station configures the downlink control channel and downlink data in the same subframe.
  • the terminal first interprets the control signaling in the Physical Downlink Control Channel (PDCCH). If there is a downlink control channel for the terminal, the terminal according to the frequency resource location and modulation and coding scheme specified in the control channel (Modulation and The information such as Coding Scheme, MCS) demodulates the downlink data sent by the base station.
  • PDCCH Physical Downlink Control Channel
  • MCS Coding Scheme
  • the LTE system is also a system based on Hybrid Automatic Repeat Request (HARQ).
  • HARQ Hybrid Automatic Repeat Request
  • the flow of the existing downlink data transmission is: the base station sends the control signaling by the PDCCH to perform downlink scheduling, and sends the downlink data.
  • the terminal After receiving the data transmission, the terminal sends a positive feedback information (ACK) to the originating end according to whether the demodulation is correct or not.
  • Negative feedback information (NACK) The base station determines whether it is necessary to retransmit the data packet according to the received feedback information, and if the feedback information is ACK, schedules a new data packet, and if the feedback information is NACK, retransmits the data packet.
  • the downlink data is received and fed back by the terminal, and the base station determines whether the downlink data needs to be retransmitted according to the downlink feedback information sent by the terminal. Because the terminal needs a certain amount of time for data processing and anti- Feed, so there is a fixed time interval between the downlink feedback time and the downlink data transmission time.
  • FIG. 1 shows the correspondence between the downlink feedback timing and the downlink data transmission timing. Where TO is the time interval between the downlink feedback and the downlink transmission.
  • the resource of the terminal feedback downlink data has a fixed correspondence with the control channel location of the downlink data scheduled by the base station. As shown in FIG.
  • the base station uses the control channel resource 0 to carry the downlink control channel to schedule the downlink of the first terminal UE1.
  • UE1 For the first transport block TBI, UE1 must send a downlink feedback ACK/NACK to the feedback resource 0 after the TO.
  • the control channel resource and the feedback resource have a corresponding relationship, including a frequency resource and a code resource, and the downlink feedback moment also has a corresponding relationship at the downlink data transmission moment. As shown in Figure 1, if the base station receives the NACK feedback, the base station performs the retransmission scheduling of the downlink data.
  • the base station After the retransmission scheduling, it is necessary to determine whether the time interval between the current time and the last downlink scheduling time exceeds the minimum retransmission time interval (round Trip Time, RTT), under the premise that the condition is met, the base station can transmit the first transport block TBI at any time after the minimum RTT, and the number in the box indicates the number of retransmissions.
  • RTT Round Trip Time
  • RTT min T0 + the time required for the base station to organize downlink retransmissions.
  • the system needs to configure the terminal to stop data transmission and reception in the working frequency band within a certain period of time, and then change the information such as the channel quality of the inter-frequency neighboring cell or the different system.
  • This period of time is called the measurement gap (gap), and the terminal cannot send or receive any information of the working frequency band within the measurement gap. If the downlink feedback time of the downlink data falls within the measurement gap, the feedback information ACK/NACK will not be sent, and the base station does not receive the ACK/NACK. If the downlink data is not successfully sent, it is impossible to determine whether downlink data is needed. Retransmission, as shown in Figure 2.
  • One possible processing method is that the base station does not initiate downlink scheduling when it is expected that the downlink feedback conflicts with the measurement gap.
  • this treatment will lead to the following disadvantages: If the downlink resource utilization is insufficient, and the measurement gap length is T1, the downlink resources in the time period of length min (T0, Tl) cannot be allocated to the user. Summary of the invention
  • the object of the present invention is to provide a downlink data scheduling method and apparatus, which can improve downlink resource utilization when downlink feedback and measurement gap conflict.
  • the base station Before performing downlink scheduling and/or downlink data transmission, the base station determines whether downlink feedback and measurement gap conflicts occur, and if yes, the base station performs downlink scheduling and downlink data packet transmission; after the measurement gap ends, the base station schedules and retransmits the downlink data packet. .
  • the embodiment of the present invention further provides another downlink data scheduling method.
  • the base station determines whether downlink feedback and measurement gap conflicts occur. If yes, the base station performs downlink scheduling and downlink data packet transmission. The base station schedules and transmits a new downlink data packet after the measurement gap ends.
  • a downlink scheduling module configured to perform downlink scheduling and/or downlink data transmission, and retransmit the downlink data packet according to the NACK feedback information from the terminal;
  • a downlink scheduling indication module configured to determine that the downlink scheduling module performs downlink scheduling and the internal, and if yes, sends a conflict indication
  • the downlink scheduling module is further configured to perform retransmission scheduling of the data packet according to the received conflict indication, and wait for the measurement gap of the terminal to end to send the retransmission data packet.
  • the embodiment of the present invention provides another apparatus for implementing downlink data scheduling, including: a downlink scheduling module, configured to perform downlink scheduling and/or downlink data transmission, and retransmit downlink data packets according to NACK feedback information from the terminal; And a downlink scheduling indication module, configured to determine that the downlink scheduling module performs downlink scheduling and the internal, and if yes, sends a conflict indication;
  • the downlink scheduling module is further configured to schedule a new downlink data packet according to the received conflict indication, and wait for the measurement gap of the terminal to end to send the new data packet downlink.
  • An embodiment of the present invention further provides a terminal, where the terminal includes:
  • a judging module configured to determine whether to enter a measurement gap, and if yes, send an indication signal that prohibits feedback
  • a receiving module configured to receive a downlink data packet from the base station
  • the feedback module is configured to send feedback information to the base station according to the situation that the receiving module receives the downlink data packet, and if the receiving module correctly receives the downlink data packet, send a positive feedback information ACK, and if the receiving module does not correctly receive the downlink data packet, send a negative feedback. Information NACK; If the feedback feedback signal from the judgment module is received, the feedback information is not sent.
  • the base station side determines whether there is a conflict between the downlink feedback and the measurement gap. If yes, the base station schedules retransmission after the measurement gap ends, or the base station schedules and sends a new downlink data packet after the measurement gap ends. Since the terminal cannot perform downlink feedback during the measurement gap, the solution of the present invention is equivalent to the base station always treating the downlink feedback during the measurement gap as a NACK and initiating a retransmission, or always treating the downlink feedback during the measurement gap as an ACK. The solution can improve the downlink resource utilization when the downlink feedback and the measurement gap collide.
  • FIG. 1 is a schematic diagram showing a correlation between a downlink feedback moment and a downlink data transmission moment in the prior art
  • FIG. 2 is a schematic diagram of a collision between a downlink feedback and a measurement gap of a terminal in the prior art
  • FIG. 3 is a flowchart of a downlink data scheduling performed by a base station according to Embodiment 1 of the present invention
  • 4 is a block diagram of a device for downlink data scheduling according to Embodiment 2 of the present invention
  • FIG. 5 is a flowchart of performing downlink data scheduling on a base station side according to Embodiment 3 of the present invention
  • FIG. 6 is a flowchart of implementing downlink data scheduling on a terminal side according to Embodiment 3 of the present invention
  • FIG. 7 is a block diagram of a terminal according to Embodiment 4 of the present invention. Mode for carrying out the invention
  • the key point of the solution of the present invention is: Whether the downlink feedback and the measurement gap are in conflict, the meaning of the conflict is that the downlink feedback moment is in the measurement gap. If yes, the base station always schedules retransmission after the measurement gap ends, or the base station always schedules the transmission after the measurement gap ends. Downstream data. In this way, it is equivalent to the base station always treating the downlink feedback during the measurement gap as NACK or always as ACK, and performing the corresponding operation.
  • the downlink data scheduling process performed by the base station in the first embodiment of the present invention is as shown in FIG. 3, and includes the following steps:
  • Step 301 Before the base station schedules the downlink data transmission, it is determined whether the downlink feedback and the measurement gap conflict occur, and if yes, step 302 is performed; otherwise, the existing downlink data scheduling process is performed.
  • the specific method for determining the conflict between the downlink feedback and the measurement gap is: the base station stores related information of the measurement gap of the terminal, and the base station determines, according to the stored measurement gap information of the terminal, the time corresponding to the scheduled downlink data transmission time before scheduling the downlink data transmission. Whether the downlink feedback time is within the measurement gap of the terminal, and if so, the downlink feedback conflicts with the measurement gap, otherwise the downlink feedback does not conflict with the measurement gap.
  • the current downlink data scheduling process is: the base station performs downlink scheduling by using the PDCCH to send control signaling, and sends downlink data; after receiving the data transmission, the terminal according to whether the demodulation is correct or not, the TO time after the downlink scheduling Sending an ACK or a NACK to the originating end; the base station determines whether the data packet needs to be retransmitted according to the received feedback information, and if the feedback information is ACK, scheduling and transmitting a new data packet; if the feedback information is NACK, then the base station performs the The retransmission scheduling of the data packet, and the retransmission data packet is sent downstream.
  • Step 302 The base station performs retransmission scheduling of the data packet, and sends the retransmission data packet in the downlink after the measurement gap ends, and the process goes to step 301.
  • the processing on the terminal side corresponding to the above process includes:
  • the terminal does not perform downlink feedback in the measurement gap, that is, cancels downlink feedback;
  • the terminal receives the retransmission data packet after the measurement gap, and if the downlink data has been correctly received, discards the retransmission data packet and feeds back the ACK; if the terminal does not correctly receive the downlink data, according to the received retransmission
  • the data packet is retransmitted and combined, and if the decoding result is correct, the ACK is fed back, and if the decoding result is incorrect, the NACK is fed back.
  • the time for receiving and processing feedback information is not reserved for the base station, and the downlink retransmission can be scheduled after the measurement gap ends, so the retransmission scheduling time is not affected by the minimum RTT. limit. That is, even if the time at which the measurement gap ends is less than the minimum RTT from the last scheduled downlink data transmission, the downlink retransmission can be scheduled immediately.
  • the second embodiment of the present invention provides a device for implementing downlink data scheduling, which can be used to implement the downlink data scheduling device of the first embodiment.
  • the device is located in the base station, and includes: a downlink scheduling module 401, configured to perform downlink scheduling and/or downlink data transmission, and retransmit the downlink data packet according to the NACK feedback information from the terminal;
  • the downlink scheduling indication module 402 is configured to determine that the downlink scheduling module 401 is performed. Within the gap, if yes, send a conflict indication;
  • the downlink scheduling module 401 is further configured to perform retransmission scheduling of the data packet according to the received conflict indication, and wait for the measurement gap of the terminal to end to send the retransmission data packet.
  • the device may further include: a measurement gap module 403, configured to store measurement gap information of the terminal;
  • the downlink scheduling indication module 402 determines, according to the measurement gap information of the terminal stored by the measurement gap module 403, that the downlink scheduling module 401 performs the downlink scheduling and/or the downlink data transmission. Whether the feedback time corresponding to the downlink scheduling and/or the downlink data transmission time is within the measurement gap of the terminal, and if yes, sends a conflict indication to the downlink scheduling module 401.
  • the terminal cancels the downlink feedback during the measurement gap, and the base station is equivalent to treating the downlink feedback during the measurement gap as a NACK and initiating retransmission.
  • This will cause a waste of downlink resources to a certain extent.
  • the packet loss occurs due to the collision between the downlink feedback and the measurement gap, and the RLC layer ARQ is retransmitted, the downlink resource waste will be more significant. Therefore, the solution of the present invention can ensure timely and correctly transmitting downlink data, is easy to implement, and can relatively save the overhead of downlink resources.
  • the third embodiment of the present invention provides another downlink data scheduling method, in which the terminal also cancels the downlink feedback during the measurement gap.
  • the difference from the first embodiment is that the base station considers the downlink feedback during the measurement gap as an ACK and ends at the measurement gap. After scheduling new downlink data. Since the downlink data can be normally received normally, the implementation of the solution in this embodiment is more concise, and the downlink resources are saved more than the solution of the first embodiment in a larger probability.
  • FIG. 5 The implementation process of this embodiment is shown in FIG. 5, and includes the following steps:
  • Step 501 Before the base station schedules the downlink data transmission, it is determined whether the downlink feedback and the measurement gap conflict occur, and if yes, step 502 is performed; otherwise, the existing downlink data scheduling process is performed.
  • the specific method for determining the conflict between the downlink feedback and the measurement gap is: the base station stores related information of the measurement gap of the terminal, and the base station determines, according to the stored measurement gap information of the terminal, the time corresponding to the scheduled downlink data transmission time before scheduling the downlink data transmission. Whether the downlink feedback time is within the measurement gap of the terminal, and if so, the downlink feedback conflicts with the measurement gap, otherwise the downlink feedback does not conflict with the measurement gap.
  • the current downlink data scheduling process is: the base station performs downlink scheduling by using the PDCCH to send control signaling, and sends downlink data; after receiving the data transmission, the terminal according to whether the demodulation is correct or not, the TO time after the downlink scheduling Sending an ACK or a NACK to the originating end; the base station determines whether the data packet needs to be retransmitted according to the received feedback information, and if the feedback information is ACK, scheduling and transmitting a new data packet; if the feedback information is NACK, then the base station performs the The retransmission scheduling of the data packet, and the retransmission data packet is sent downstream.
  • Step 502 The base station schedules a new downlink data packet, and sends the new data packet downlink after the measurement gap ends, and proceeds to step 501.
  • Step 601 The terminal determines whether to enter the measurement gap, and if yes, performs step 602, otherwise, performs an existing downlink data reception feedback process.
  • the existing downlink data receiving feedback process includes: the terminal receives the downlink data packet, and determines whether it is correctly received, and if yes, sends a positive feedback information ACK to the base station, otherwise sends a negative feedback information NACK:.
  • Step 602 The terminal determines whether the downlink data packet is correctly received, if yes, cancels the next downlink feedback, and proceeds to step 601; otherwise, step 603 is performed;
  • Step 603 The terminal informs the base station to retransmit the data through the status report after the measurement gap, and proceeds to step 601.
  • the downlink data scheduling device for implementing the third embodiment is located at the base station, and the component module thereof can be as shown in FIG. 4, and further includes a downlink scheduling indication module and a downlink scheduling module, but only functions. It is different from the downlink data scheduling device in the second embodiment.
  • the downlink scheduling module is configured to perform downlink scheduling and/or downlink data transmission, and retransmit the downlink data packet according to the NACK feedback information from the terminal; and schedule a new downlink data packet according to the ACK feedback message from the terminal;
  • a downlink scheduling indication module configured to determine whether a downlink feedback moment corresponding to the downlink scheduling module and the downlink data transmission moment is in a measurement gap of the terminal, and if yes, sending a conflict indication
  • the downlink scheduling module is further configured to schedule a new downlink data packet according to the received conflict indication, and wait for the measurement gap of the terminal to end to send the new data packet downlink.
  • the device may further include: a measurement gap module, configured to store measurement gap information of the terminal;
  • the downlink scheduling indication module determines, according to the measurement gap information of the terminal stored by the measurement gap module, the downlink scheduling module to perform downlink scheduling and/or before the downlink scheduling module performs downlink scheduling and/or downlink data transmission. Or whether the feedback moment corresponding to the downlink data transmission time is within the measurement gap of the terminal, and if yes, sends a conflict indication to the downlink scheduling module.
  • a fourth embodiment of the present invention provides a terminal, which can be used to implement the downlink scheduling method as described in Embodiment 3.
  • the terminal is shown in Figure 7, and includes:
  • the determining module 701 is configured to determine whether the measurement gap is entered, and if yes, send an indication signal for prohibiting feedback to the feedback module;
  • the receiving module 702 is configured to receive a downlink data packet from the base station
  • the feedback module 703 is configured to send feedback information to the base station according to the situation that the receiving module 702 receives the downlink data packet, and if the receiving module 702 correctly receives the downlink data packet, send the positive feedback information ACK, and if the receiving module 702 does not correctly receive the downlink data packet, Then, the negative feedback information NACK is sent; if the forbidden feedback signal from the determining module 701 is received, the reverse is not sent. Feed information.
  • the determining module 701 may further determine whether the receiving module 702 correctly receives the downlink data packet after determining to enter the measurement gap, and if yes, send the indication signal for prohibiting feedback to the feedback module 703, otherwise, send the delayed feedback to the feedback module 703. If the indication signal of the delayed feedback is received, the feedback module 703 waits for the measurement gap to end, and sends a status report for notifying the retransmission data to the base station.

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Description

一种下行数据调度方法和装置
技术领域
本发明涉及无线通信技术领域， 特别涉及一种下行数据调度方法和 装置。 发明背景
长期演进项目（ Long Term Evolution, LTE )系统 于调度的系统， 由基站 （eNB )分配用于承载数据的时频资源并发送控制信道信息， 终 端 （ User Equipment, UE )根据基站的控制信道信息接收下行数据或发 送上行数据。
对下行数据传输， 基站在同一个子帧中配置下行控制信道和下行数 据。 终端先解读物理下行控制信道（ Physical Downlink Control Channel , PDCCH ) 中的控制信令，如果有针对所述终端的下行控制信道， 该终端 根据控制信道中指定的频率资源位置和调制编码方案 （Modulation and Coding Scheme, MCS )等信息解调基站发送的下行数据。
LTE 系统也是基于混合自动重传请求 （Hybrid Automatic Repeat Request, HARQ )的系统。现有下行数据传输的流程是：基站通过 PDCCH 下发控制信令进行下行调度， 并发送下行数据； 终端在接收到数据传输 后， 根据解调正确与否向发端发送肯定反馈信息（ACK )或否定反馈信 息 （NACK ); 基站根据所收到的反馈信息决定是否需要重传该数据包， 若反馈信息是 ACK则调度新的数据包， 如果反馈信息是 NACK则重传 数据包。
下行数据由终端接收和反馈， 基站根据终端发送的下行反馈信息决 定是否需要重传下行数据。 由于终端需要一定的时间用于数据处理和反 馈， 因此下行反馈时刻和下行数据传输时刻之间有一个固定时间间隔。 图 1 示出了下行反馈时刻与下行数据传输时刻的对应关系。 其中， TO 表示下行反馈和下行传输之间的时间间隔。 为了区分不同终端的反馈， 终端反馈下行数据的资源与基站调度下行数据的控制信道位置有固定 的对应关系， 如图 1中， 基站用控制信道资源 0承载下行控制信道调度 第一终端 UE1的下行第一传输块 TBI ,则 UE1必须在 TO后的反馈资源 0发送下行反馈 ACK/NACK。所述控制信道资源与反馈资源具有——对 应的关系， 包括频率资源和码资源， 而下行反馈时刻也于下行数据传输 时刻具有——对应的关系。 如图 1所示， 基站如果收到 NACK反馈， 基 站进行下行数据的重传调度， 在重传调度之后需要判断当前时刻距离上 一次下行调度的时刻的时间间隔是否超过最小重传时间间隔 ( Round Trip Time, RTT ), 在满足该条件的前提下， 基站可以在最小 RTT之后 的任意时刻下行发送第一传输块 TBI， 方框内的数字表示重传的次数。 图 1中的！^！^为最小重传时间间隔，
RTTmin=T0+基站组织下行重传所需的时间。
为了支持异频和异系统切换， 系统需配置终端在一定时间段内停止 工作频段的数据收发， 改为测量异频邻小区或异系统的信道质量等信 息。 这个时间段称为测量间隙 （gap ), 在测量间隙内终端不能收发工作 频段的任何信息。 如果终端对下行数据的下行反馈时刻落在了测量间隙 内， 则不会发送反馈信息 ACK/NACK, 基站收不到 ACK/NACK, 则不 知道下行数据是否发送成功， 就无法确定是否需要下行数据重传， 如图 2所示。
目前， 对于这种下行反馈与测量间隙冲突的问题还没有很好的解决 方案。 一种可能的处理方式是基站在预期到下行反馈与测量间隙冲突的 时候不发起下行调度。 但这种处理方式会导致如下缺点： 下行资源利用不充分，设测量间隙长度为 T1 , 则长度为 min(T0,Tl) 时间段内的下行资源都不能分配给该用户使用。 发明内容
有鉴于此，本发明的目的在于，提出一种下行数据调度方法和装置， 可以提高下行反馈与测量间隙冲突时的下行资源利用率。
本发明实施例提出的一种下行数据调度方法， 包括：
基站进行下行调度和 /或下行数据传输之前，判断是否会出现下行反 馈与测量间隙冲突， 若是， 则基站进行下行调度和下行数据包传输； 在 测量间隙结束后基站调度并重传所述下行数据包。
本发明实施例还提出另一种下行数据调度方法， 基站进行下行调度 和 /或下行数据传输之前， 判断是否会出现下行反馈与测量间隙冲突， 若 是， 则基站进行下行调度和下行数据包传输； 基站在测量间隙结束后调 度并发送新下行数据包。
本发明实施例提出的实现下行数据调度的装置包括：
下行调度模块， 用于进行下行调度和 /或下行数据传输， 根据来自终 端的 NACK反馈信息重传下行数据包；
下行调度指示模块， 用于判断与所述下行调度模块进行下行调度和 内， 若是， 则发送冲突指示；
所述下行调度模块还用于根据所收到的冲突指示进行数据包的重 传调度， 等待终端的测量间隙结束后下行发送该重传数据包。
本发明实施例提出另一种用于实现下行数据调度的装置， 包括： 下行调度模块， 用于进行下行调度和 /或下行数据传输， 根据来自终 端的 NACK反馈信息重传下行数据包； 下行调度指示模块， 用于判断与所述下行调度模块进行下行调度和 内， 若是， 则发送冲突指示；
所述下行调度模块还用于根据所收到的冲突指示， 调度新的下行数 据包， 等待终端的测量间隙结束后下行发送该新的数据包。
本发明实施例还提出一种终端， 该终端包括：
判断模块， 用于判断是否进入测量间隙， 若是， 则发送一个禁止反 馈的指示信号；
接收模块， 用于接收来自基站的下行数据包；
反馈模块， 用于根据接收模块接收下行数据包的情况向基站发送反 馈信息， 若接收模块正确接收下行数据包， 则发送肯定反馈信息 ACK, 若接收模块没有正确接收下行数据包， 则发送否定反馈信息 NACK; 若 收到来自判断模块的禁止反馈信号， 则不发送反馈信息。
从以上技术方案可以看出， 基站侧判断下行反馈与测量间隙是否存 在冲突， 若存在， 则基站在测量间隙结束后调度重传， 或者基站在测量 间隙结束后调度发送新的下行数据包。 由于终端在测量间隙期间无法进 行下行反馈， 本发明方案就相当于基站将测量间隙期间的下行反馈总是 看作 NACK 并发起重传， 或者总是将测量间隙期间的下行反馈看作 ACK。 该方案可以提高下行反馈与测量间隙冲突时的下行资源利用率。 附图简要说明
图 1为现有技术中下行反馈时刻与下行数据传输时刻的相互关系的 示意图；
图 2为现有技术中下行反馈与终端的测量间隙出现冲突的示意图； 图 3为本发明实施例一中基站实现下行数据调度的流程图； 图 4为本发明实施例二提出的下行数据调度的装置框图；
图 5为本发明实施例三提出的基站侧实现下行数据调度流程图； 图 6为本发明实施例三提出的终端侧实现下行数据调度流程图； 图 7为本发明实施例四提出的终端框图。 实施本发明的方式
由于终端在测量间隙期间无法进行下行反馈， 而下行数据调度又需 要终端进行下行反馈， 为解决现有技术中存在的下行反馈与测量间隙冲 突的问题， 本发明方案的关键点在于： 基站侧判断下行反馈与测量间隙 是否存在冲突， 存在冲突的含义就是下行反馈时刻处于测量间隙中， 若 存在， 则基站总是在测量间隙结束后调度重传， 或者基站总是在测量间 隙结束后调度发送新的下行数据。 这样， 就相当于基站将测量间隙期间 的下行反馈总是看作 NACK或总是看作 ACK, 并执行相应操作。
为使本发明的目的、 技术方案和优点更加清楚， 下面结合实施例对 本发明作进一步的详细阐述。
本发明实施例一的基站实现下行数据调度流程如图 3所示， 包括如 下步骤：
步骤 301 : 基站调度下行数据传输之前， 判断是否会出现下行反馈 与测量间隙冲突， 若是， 则执行步骤 302; 否则， 执行现有的下行数据 调度流程。
所述判断下行反馈与测量间隙冲突的具体做法是： 基站中存储了终 端的测量间隙的相关信息， 基站在调度下行数据传输之前， 根据所存储 的终端测量间隙信息判断与调度下行数据传输时刻对应的下行反馈时 刻是否处于终端的测量间隙内，若是，则下行反馈与测量间隙存在冲突， 否则下行反馈与测量间隙无冲突。 所述现有的下行数据调度流程为： 基站通过 PDCCH下发控制信令 进行下行调度， 并发送下行数据； 终端在接收到数据传输后， 根据解调 正确与否， 在下行调度之后的 TO时刻向发端发送 ACK或 NACK; 基站 根据所收到的反馈信息决定是否需要重传该数据包，若反馈信息是 ACK 则调度并发送新的数据包； 如果反馈信息是 NACK, 则， 则基站进行该 数据包的重传调度， 下行发送该重传数据包。
步骤 302: 基站进行数据包的重传调度， 在测量间隙结束后下行发 送该重传数据包， 并转至步骤 301。
与上述流程对应的终端侧的处理包括：
终端在测量间隙内不进行下行反馈， 即取消下行反馈；
终端在测量间隙之后接收到重传数据包， 如果已经正确接收到该下 行数据， 丟弃重传数据包， 并反馈 ACK; 终端如果没有正确接收到该下 行数据， 则根据所收到的重传数据包进行重传合并解码， 若解码结果正 确则反馈 ACK, 若解码结果错误则反馈 NACK。
由于本发明实施例的流程中终端不发下行反馈， 也就不用为基站留 出接收和处理反馈信息的时间， 测量间隙结束后就可以调度下行重传， 因此重传调度时间不受最小 RTT的限制。也就是说， 即使测量间隙结束 的时刻距离上次调度下行数据传输的时刻小于最小 RTT, 仍然可以立即 调度下行重传。
本发明实施例二提出一种实现下行数据调度的装置可用于实现上述 实施例一的下行数据调度装置。如图 4所示， 该装置位于基站中， 包括： 下行调度模块 401 , 用于进行下行调度和 /或下行数据传输， 根据来 自终端的 NACK反馈信息重传下行数据包；
下行调度指示模块 402, 用于判断与所述下行调度模块 401进行下 量间隙内， 若是， 则发送冲突指示；
所述下行调度模块 401还用于根据所收到的冲突指示进行数据包的 重传调度， 等待终端的测量间隙结束后下行发送该重传数据包。
该装置还可以进一步包括： 测量间隙模块 403 , 用于存储终端的测 量间隙信息；
则所述下行调度指示模块 402在所述下行调度模块 401进行下行调 度和 /或下行数据传输之前，根据所述测量间隙模块 403存储的终端的测 量间隙信息，判断与所述下行调度模块 401进行下行调度和 /或下行数据 传输时刻对应的反馈时刻是否处于终端的测量间隙内， 若是则向下行调 度模块 401发送冲突指示。
本发明实施例一提出的下行数据调度方法， 终端在测量间隙期间取 消下行反馈， 而基站相当于将测量间隙期间的下行反馈看作是 NACK, 并发起重传。 这在一定程度上会造成下行资源浪费。 但是， 如果因为下 行反馈与测量间隙冲突造成了数据包丟失，从而引起 RLC层 ARQ重传， 造成的下行资源浪费将更加可观。 因此， 本发明方案可以保证及时并且 正确地传输下行数据， 易于实现， 并且能够相对节省下行资源的开销。
本发明实施例三提出另一种下行数据调度方法， 终端在测量间隙期 间同样取消下行反馈， 与实施例一不同的是， 基站将测量间隙期间的下 行反馈看作是 ACK, 并在测量间隙结束后调度新的下行数据。 由于一般 来说下行数据都能够正常接收， 本实施例的方案实现更加简洁， 并且在 较大的概率上比实施例一的方案更加节省下行资源。
本实施例的实现流程如图 5所示， 包括如下步骤：
步骤 501 : 基站调度下行数据传输之前， 判断是否会出现下行反馈 与测量间隙冲突， 若是， 则执行步骤 502; 否则， 执行现有的下行数据 调度流程。 所述判断下行反馈与测量间隙冲突的具体做法是： 基站中存储了终 端的测量间隙的相关信息， 基站在调度下行数据传输之前， 根据所存储 的终端测量间隙信息判断与调度下行数据传输时刻对应的下行反馈时 刻是否处于终端的测量间隙内，若是，则下行反馈与测量间隙存在冲突， 否则下行反馈与测量间隙无冲突。
所述现有的下行数据调度流程为： 基站通过 PDCCH下发控制信令 进行下行调度， 并发送下行数据； 终端在接收到数据传输后， 根据解调 正确与否， 在下行调度之后的 TO时刻向发端发送 ACK或 NACK; 基站 根据所收到的反馈信息决定是否需要重传该数据包，若反馈信息是 ACK 则调度并发送新的数据包； 如果反馈信息是 NACK, 则， 则基站进行该 数据包的重传调度，， 下行发送该重传数据包。
步骤 502: 基站调度新的下行数据包， 在测量间隙结束后下行发送 该新的数据包， 并转至步骤 501。
与上述流程对应的终端侧的处理如图 6所示， 包括如下步骤： 步骤 601 : 终端判断是否进入测量间隙， 若是， 则执行步骤 602, 否 则进行现有的下行数据接收反馈过程。
所述现有的下行数据接收反馈过程包括： 终端接收下行数据包， 并 判断是否正确接收，若是则向基站发送肯定反馈信息 ACK, 否则发送否 定反馈信息 NACK：。
步骤 602: 终端判断是否正确接收下行数据包， 若是则取消本次下 行反馈， 并转至步骤 601 ; 否则执行步骤 603;
步骤 603: 终端在测量间隙之后通过状态报告告知基站重传数据， 并转至步骤 601。
用于实现实施例三的下行数据调度装置位于基站， 其组成模块可以 如图 4所示， 同样包括下行调度指示模块以及下行调度模块， 只是功能 与实施例二中的下行数据调度装置有所不同。
其中下行调度模块， 用于进行下行调度和 /或下行数据传输， 根据来 自终端的 NACK反馈信息重传下行数据包； 根据来自终端的 ACK反馈 消息调度新的下行数据包；
下行调度指示模块，用于判断与所述下行调度模块进行下行调度和 / 或下行数据传输时刻对应的下行反馈时刻是否处于终端的测量间隙内， 若是， 则发送冲突指示；
所述下行调度模块还用于根据所收到的冲突指示， 调度新的下行数 据包， 等待终端的测量间隙结束后下行发送该新的数据包。
该装置还可以进一步包括： 测量间隙模块， 用于存储终端的测量间 隙信息；
则所述下行调度指示模块在所述下行调度模块进行下行调度和 /或 下行数据传输之前， 根据所述测量间隙模块存储的终端的测量间隙信 息，判断与所述下行调度模块进行下行调度和 /或下行数据传输时刻对应 的反馈时刻是否处于终端的测量间隙内， 若是则向下行调度模块发送冲 突指示。
本发明实施例四提出一种终端， 可以用于实现如实施例三所述的下 行调度方法。 该终端如图 7所示， 包括：
判断模块 701 , 用于判断是否进入测量间隙， 若是， 则向反馈模块 发送一个禁止反馈的指示信号；
接收模块 702, 用于接收来自基站的下行数据包；
反馈模块 703 , 用于根据接收模块 702接收下行数据包的情况向基 站发送反馈信息， 若接收模块 702正确接收下行数据包， 则发送肯定反 馈信息 ACK,若接收模块 702没有正确接收下行数据包， 则发送否定反 馈信息 NACK; 若收到来自判断模块 701的禁止反馈信号， 则不发送反 馈信息。
所述判断模块 701还可以在判断进入测量间隙后， 进一步判断接收 模块 702是否正确接收下行数据包， 若是， 则向反馈模块 703发送禁止 反馈的指示信号， 否则， 向反馈模块 703发送延迟反馈的指示信号； 所述反馈模块 703若收到延迟反馈的指示信号， 则等待测量间隙结 束后， 向基站发送用于告知重传数据的状态报告。
通过以上的实施方式的描述， 本领域的技术人员可以清楚地了解到 本发明可借助软件加必需的硬件平台的方式来实现， 当然也可以全部通 过硬件来实施，但很多情况下前者是更佳的实施方式。基于这样的理解， 本发明的技术方案对背景技术做出贡献的全部或者部分可以以软件产 品的形式体现出来， 该计算机软件产品可以存储在存储介质中， 如 ROM/RAM, 磁碟、 光盘等， 包括若干指令用以使得一台基站设备执行 本发明各个实施例或者实施例的某些部分所述的方法。
以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡 在本发明的精神和原则之内所作的任何修改、 等同替换和改进等， 均应 包含在本发明的保护范围之内。

Claims

权利要求书
1、 一种下行数据调度方法， 其特征在于， 包括：
基站进行下行调度和 /或下行数据传输之前，判断是否会出现下行反 馈与测量间隙冲突， 若是， 则基站进行下行调度和下行数据包传输； 在 测量间隙结束后基站调度并重传所述下行数据包。
2、根据权利要求 1所述的下行数据调度方法， 其特征在于， 所述基 站判断是否会出现下行反馈与测量间隙冲突包括：
基站根据所存储的终端测量间隙信息， 判断与调度下行数据传输时 刻相对应的下行反馈时刻是否处于终端的测量间隙内， 若是， 则下行反 馈与测量间隙存在冲突。
3、根据权利要求 1所述的下行数据调度方法， 其特征在于， 该方法 进一步包括：
终端接收到所述重传的下行数据包， 如果已经正确接收到该下行数 据包， 则丟弃重传的下行数据包， 并反馈 ACK; 终端如果没有正确接收 到该下行数据包， 则根据所收到的重传的下行数据包进行重传合并解 码。
4、根据权利要求 1、 2或 3所述的下行数据调度方法， 其特征在于， 所述判断是否会出现下行反馈与测量间隙冲突的结果为否， 则进一步包 括： 基站根据所收到的反馈信息决定是否需要重传下行数据包， 若反馈 信息是 ACK则调度并发送新的下行数据包； 如果反馈信息是 NACK, 则基站进行原下行数据包的重传调度， 下行发送所述重传下行数据包。
5、 一种下行数据调度方法， 其特征在于， 包括：
基站进行下行调度和 /或下行数据传输之前，判断是否会出现下行反 馈与测量间隙冲突， 若是， 则基站进行下行调度和下行数据包传输； 基 站在测量间隙结束后调度并发送新下行数据包。
6、根据权利要求 5所述的下行数据调度方法， 其特征在于， 所述基 站判断是否会出现下行反馈与测量间隙冲突包括：
基站根据所存储的终端测量间隙信息， 判断与调度下行数据传输时 刻相对应的下行反馈时刻是否处于终端的测量间隙内， 若是， 则下行反 馈与测量间隙存在冲突。
7、根据权利要求 5所述的下行数据调度方法， 其特征在于， 该方法 进一步包括：
若 UE没有正确接收所述基站在下行反馈与测量间隙冲突情况下发 送的下行数据包， UE侧的自动重传请求 ARQ通过状态^艮告通知 eNB 重新传输该下行数据包。
8、 一种用于实现下行数据调度的装置， 其特征在于， 包括： 下行调度模块， 用于进行下行调度和 /或下行数据包传输， 根据来自 终端的 NACK反馈信息重传下行数据包；
下行调度指示模块，用于判断与所述下行调度模块进行下行调度和 / 或下行数据包传输时刻相对应的下行反馈时刻是否处于终端的测量间 隙内， 若是， 则发送冲突指示；
所述下行调度模块还用于根据所收到的冲突指示进行数据包的重传 调度， 等待终端的测量间隙结束后下行发送该重传数据包。
9、 根据权利要求 8所述的实现下行数据调度的装置， 其特征在于， 该装置进一步包括： 测量间隙模块， 用于存储终端的测量间隙信息； 则所述下行调度指示模块在所述下行调度模块进行下行调度和 /或 下行数据传输之前， 根据所述测量间隙模块存储的终端的测量间隙信 息， 判断与所述下行调度模块调度下行数据传输时刻相对应的下行反馈 时刻是否处于终端的测量间隙内， 若是则向下行调度模块发送冲突指
10、 一种用于实现下行数据调度的装置， 其特征在于， 包括： 下行调度模块， 用于进行下行调度和 /或下行数据传输， 根据来自终 端的 NACK反馈信息重传下行数据包；
下行调度指示模块，用于判断与所述下行调度模块进行下行调度和 / 内， 若是， 则发送冲突指示；
所述下行调度模块还用于根据所收到的冲突指示， 调度新的下行数 据包， 等待终端的测量间隙结束后下行发送该新的数据包。
11、 一种终端， 其特征在于， 该终端包括：
判断模块， 用于判断是否进入测量间隙， 若是， 则发送一个禁止反 馈的指示信号；
接收模块， 用于接收来自基站的下行数据包；
反馈模块， 用于根据接收模块接收下行数据包的情况向基站发送反 馈信息， 若接收模块正确接收下行数据包， 则发送肯定反馈信息 ACK, 若接收模块没有正确接收下行数据包， 则发送否定反馈信息 NACK; 若 收到来自判断模块的禁止反馈信号， 则不发送反馈信息。
12、根据权利要求 11所述的终端， 其特征在于， 所述判断模块在判 断进入测量间隙后， 进一步判断接收模块是否正确接收下行数据包， 若 是， 则向所述反馈模块发送禁止反馈的指示信号， 否则， 向反馈模块发 送延迟反馈的指示信号；
所述反馈模块若收到延迟反馈的指示信号，则等待测量间隙结束后， 向基站发送用于告知重传数据的状态报告。
PCT/CN2009/071917 2008-05-22 2009-05-22 一种下行数据调度方法和装置 WO2009140926A1 (zh)

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