CN2686255Y - 使用混合自动重复请求用于传输块设置传送的用户设备 - Google Patents

使用混合自动重复请求用于传输块设置传送的用户设备 Download PDF

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CN2686255Y
CN2686255Y CNU03204240XU CN03204240U CN2686255Y CN 2686255 Y CN2686255 Y CN 2686255Y CN U03204240X U CNU03204240X U CN U03204240XU CN 03204240 U CN03204240 U CN 03204240U CN 2686255 Y CN2686255 Y CN 2686255Y
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tbs
transmission
modulation
time interval
transmission block
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S·E·特里
N·博卢彻
A·泽拉
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Intel Corp
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • 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
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0041Arrangements at the transmitter end
    • H04L1/0042Encoding specially adapted to other signal generation operation, e.g. in order to reduce transmit distortions, jitter, or to improve signal shape
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045Arrangements at the receiver end
    • H04L1/0047Decoding adapted to other signal detection operation
    • 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
    • H04L1/1822Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
    • 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
    • H04L1/1835Buffer management
    • H04L1/1845Combining techniques, e.g. code combining
    • 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
    • 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
    • H04L1/1893Physical mapping arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055Physical resource allocation for ACK/NACK
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/21Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/23Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding

Abstract

一种接收传输时间间隔数据的用户设备。该传输时间间隔数据使用自适应的调制和编码。所述用户设备具有一种物理层混合自动重复请求机制,以用于所接收的传输时间间隔数据。该用户设备包括耦合一根天线的接收器。该接收器接收传输时间间隔数据。该传输时间间隔数据有多个传输块设置且使用第一种规定的调制和编码机制来发送。接收器接收至少一个重传的传输块设置。该重传的传输块设置使用第二种不同的规定的调制和编码机制来发送。一个混合自动重复请求解码器耦合至该接收器,并确定是否各传输块设置的数据符合规定的质量。该混合自动重复请求解码器将该至少一个重传的传输块设置与对应的先前接收的传输块设置结合。当规定的质量未得到满足时,一个自动重复请求发送器发送一个重复请求。

Description

使用混合自动重复请求用于传输块设置传送的用户设备
技术领域
本实用新型一般涉及无线电通信系统。具体来说,本实用新型涉及这些系统中的数据传输,在这些系统中,使用自适应调制和编码(AMC)和混合自动重复请求(H-ARQ)技术。
背景技术
在无线电通信系统中,比如使用码分多址(CDMA)或正交频分复用(OFDM)系统的第三代合作伙伴项目(3GPP)时分双工(TDD)或频分双工(FDD)通信系统中,使用AMC来优化对空中资源的使用。
用以传递数据的调制和编码方案(设置)依据无线电信道条件而有所不同。举例说,某种误码(如Turbo-卷积编码)、编码速率、CDMA系统的扩频因子、调制类型(如正交相移键控-M-ary正交调幅)、和/或OFDM系统的加/减副载波都可以改变。如果信道特性增强,就使用较低的数据冗余性和/或“次强健”的调制和编码设置传送数据。从而,在无线电资源的给定配置上,传送更多用户数据,以获得更高的有效数据速率。相反地,如果信道特性降低,就使用较高数据冗余性的“更强健”的调制和编码设置来传送较少的用户数据。使用AMC,可以更好的保持空中资源利用和服务质量(QOS)之间的最优化。
在这样的系统中接收到的数据通过空中接口(air interface)在传输时间间隔(TTIs)里传送。传送到一个特殊用户设备的一个传输时间间隔里的数据即称为传输块设置(transport block set,TBS)。在一个特殊的空中资源的配置中,一个次强健的调制和编码设置容许较大的TBS容量而更强健的调制和编码设置则只容许较小的TBS容量。作为结果,给定无线电资源分配的调制和编码设置规定在给定传输时间间隔中可以支持的传输块设置的最大容量。
在这些系统中,可以使用混合自动重复请求(H-ARQ)机制来维持服务质量并提高无线电资源的效率。图1显示的是一个使用H-ARQ的系统。一个发送器20使用一个特殊的调制和编码设置通过空中接口传送一个TBS。该TBS由接收器26接收。一个H-ARQ解码器30解码接收到的TBS。如果接收到的数据的质量是不可接受的,一个ARQ发送器28会要求该TBS重传。一种检查接收到的TBS质量的方法是循环冗余校验(CRC)。ARQ接收器22接收到请求,发送器20即重传该TBS。重传会使用更强健的调制和编码设置来增加输送成功的可能性。H-ARQ解码器30结合收到TBS的各个版本,对于结合的一个要求是被结合的TBS必须是相同的。如果这个合成质量仍不足够,就会请求再一次重传。如果合成质量充分,比如结合的TBS通过CRC检验,接收的TBS就释放,以做进一步的处理。该H-ARQ机制容许具有不可接受质量的被接收数据重新传递,以便保持所需的QOS。
在一个同时使用H-ARQ和AMC的系统中,可能要求必须改变调制和编码设置,以达到所请求的TBS重传的成功传输。在这种情况下,TTI里容许的物理数据位的最大量随调制和编码设置而变化。
由于每TTI只存在一个TBS,有效用户数据速率和用于每TTI的TBS容量相一致。为达到最大的数据速率,在TTI里,将最大的TBS容量用在最不强健的调制和编码设置上。当无线电信道条件为成功传输而要求一个更强健的调制和编码设置时,例如当在TTI里无法支持一个TBS容量时。因此,当工作于最大数据速率时,每次一旦实现更强健的调制和编码要求,所有H-ARQ过程里没有被成功确认的未完成传输都必须删除。
当使用增量冗余(IR)时,TBS数据在重传中必须保持恒定以便适当的结合。因此,为保证可以在更强健的调制和编码设置上支持TBS重传,初始传输和使用的TBS容量必须符合最强健的MCS。然而,当使用最强健的调制和编码设置所容许的TBS容量时,可变的最大数据速率就降低了;当使用次强健调制和编码设置时,物质资源就无法得到充分利用。
当更强健的调制和编码设置不支持TBS时,该TBS可由原来的调制和编码设置重传。然而,如果信道条件指示使用更强健的调制和编码设置或初始传输被数次破坏,重传的TBS的结合可能永远无法通过,导致传输失败。
在现有设备中,当TBS无法由AMC和H-ARQ机制成功传递时,由无线电链路控制(RLC)协议(在第二层)处理恢复。和失败传输的H-ARQ恢复不同,RLC误差检测、数据恢复和排在节点B的TBS的缓冲导致块误码率和数据时延增加,潜在导致无法达到QOS要求。
因此,为了在最小的H-ARQ传输故障下提供最大的数据速率,就要求在这些系统中支持增量冗余并容许调制和编码设置的适配。
实用新型内容
一种接收传输时间间隔数据的用户设备。该传输时间间隔数据使用自适应的调制和编码。所述用户设备具有一种物理层混合自动重复请求机制,以用于所接收的传输时间间隔数据。该用户设备包括耦合一根天线的接收器。该接收器接收传输时间间隔数据。该传输时间间隔数据有多个传输块设置且使用第一种规定的调制和编码机制来发送。接收器接收至少一个重传的传输块设置。该重传的传输块设置使用第二种不同的规定的调制和编码机制来发送。一个混合自动重复请求解码器耦合至该接收器,并确定是否各传输块设置的数据符合规定的质量。该混合自动重复请求解码器将该至少一个重传的传输块设置与对应的先前接收的传输块设置结合。当规定的质量未得到满足时,一个自动重复请求发送器发送一个重复请求。
附图说明
图1是无线电H-ARQ通信系统的一个实例。
图2A~2D是一个具有多个TBS的TTI示意图。
图3A~3C是以能够拥有多个TBS的TTI来使用AMC的无线电H-ARQ通信系统的具体实例。
图4是在H-ARQ重传之前改变调制和编码设置的流程图。
图5是在一个单独的TBS重传之前改变调制和编码设置的示意图。
图6是在所有三个TBS重传前改变调制和编码设置的示意图。
图7是在TDD/CDMA通信系统中重叠的TBS的示意图。
图8是在TDD/CDMA通信系统中无重叠的TBS的示意图。
具体实施方式
图2A、2B、2C和2D显示了一个具有多个TBS,即从TBS1到TBSN的TTI。图2A说明了多个TBS以时间划分TTI,例如在TDD/CDMA系统中的使用。图2B说明了由编码划分的多个TBS,例如在FDD/CDMA或TDD/CDMA系统中的使用。图2C说明了由时间和编码而分开的多个TBS,例如在TDD/CDMA系统中的使用。图2D说明了由副载波而分开的多个TBS,例如在OFDM系统中的使用。每个TBS按大小排列,以便用最强健的调制和编码设置对分配的资源传输。举例,最强健的MCS可能在TTI内仅支持最大限度为2000比特TBS的载量。虽然被称为是最强健的调制和编码设置,但在实践中,若不大可能需要最强健调制和编码设置,则所述最强健设置仅是较强健设置。最不强健的调制和编码设置可能具有在TTI内支持最大限度为20000比特TBS的载量。虽然被称为是最不强健的调制和编码设置,但在实践中,若不大可能需要最不强健的调制和编码设置,则最不强健的设置可能实际上是较次强健的设置。
TBS最好按大小排列以便以最强健的调制和编码设置在TTI里传输。然后,当使用最不强健的调制和编码设置时,在TTI中就使用这个容量的多个TBS以达到最大数据速率,当为成功传输而要求更大的传输可靠性时,可以使用最强健的调制和编码设置。
图3A是传送具有一个或多个TBS的TTI的发送器44和接收器46的简图。该发送器44既可定位在用户设备上也可定位在一个基站/节点B上。接收器46既可定位在一个基站/节点B上也可定位在用户设备上。在现有的系统实施方案中,AMC通常只用于下行链路。因此,传输的较佳实施例是为了用于支持下行链路的AMC。对于在上行链路使用AMC的其他系统,传输块设置传输可以用于上行链路。
发送器301到30N(30)通过空中接口36传送每个TBS,从TBS1到TBSN。TTI里的TBS数量取决于TBS的容量和用于传输的调制和编码设置。如果使用最强健的调制和编码设置来保证成功传输,TTI就可能仅支持一个TBS;如果使用次强健的调制和编码设置来达到较高的有效数据速率,就在TTI里发送多个TBS。另外如图3B所示,一些TBS可以发到不同的接收器461到46K(46)。如图3C所示,每个TBS还可以发送到不同的接收器461到46N(46)。这种灵活性容许无线电资源的更大利用和更高效率。
接收器381到38N(38)接收每一个传递的TBS。H-ARQ解码器421到42N(42)解码每个收到的TBS。虽然在图3中,显示一个发送器30、接收器38和H-ARQ解码器42为每个TBS所有,一个发送器30、接收器38和H-ARQ解码器42也可以处理所有的TBS。对每个无法通过质量测试的TBS,由ARQ发送器40发出一个重传请求。ARQ接收器32接收该请求并控制传输适当的TBS。重传的TBS由H-ARQ解码器42结合并再次执行质量测试。一旦TBS通过质量测试,它就释放,以做进一步的处理。由于一个TTI可以包含多个TBS,一个TBS中的失误最好不会要求整个TTI的重传,这就更有效地利用了无线电资源。
图3A、3B和3C也显示了一个AMC控制器34。如果信道条件改变,该AMC控制器就会在用来传递数据的调制和编码设置中启动变化。图4是一个流程图,演示在各次重传之间发生在AMC里的这样一个变化。已传递的TTI具有多个TBS,随后调制和编码设置就发生变化(步骤50)。用图5说明,一个TTI在最不强健的调制和编码设置上使用三个TBS,即TBS1、TBS2和TBS3以达到最大的数据速率。图5所示的调制和编码设置发生改变以致随后只有一个TBS可以传递。再参见图4,至少有一个TBS是以不可接受的质量接收的并且要求一次重传(步骤52)。如图5所示,用大的“X”所标出的TBS2要求重传。要求重传的TBS在新的调制和编码设置上发送并与先前的TBS传输结合起来(步骤54)。如图5所示,只有TBS2是重传的并且它和先前的TBS2传输结合起来。虽然此例只说明了在更强健的调制和编码设置上只发送一个TBS,在TTI里以更强健的调制和编码设置发送两个TBS也是可能的。
图6是一个要求重传的多个TBS的示意图。三个TBS,TBS1、TBS2和TBS3在TTI里传递。在调制和编码设置中发生变化,以致每次只能发送一个TBS。所有三个TBS都以不可接受的质量被接收。对于所有三个TBS发送重传请求。如在单独的各TTIs里重传1、重传2和重传3所示,每个TBS被依次重传。重传的TBS都和先前的传输相结合。如果TTI里的两个TBS都使用更强健的调制和编码设置传递时,使用相似的过程。
如图所示,多个TBS容许最大数据速率和增量冗余。TTI可以在达到最大数据速率的最不强健的调制和编码设置上传递,并且以更强健的调制和编码设置进行随后的H-ARQ重传,以保证更大可能的成功传输发生。通过使用增量冗余,无线电资源可以得到更为积极广泛的应用。可以用一个比较积极的(次强健的)调制和编码设置来取得更高的数据速率和无线电资源效率,因为如果信道条件降低,可以使用一个更为稳健的(更强健的)设置来实现传输以维持QOS。
在TDD/CDMA通信系统中,比如在3GPP系统中,两种较佳的在一个TTI里执行多个TBS的方法是使用重叠时隙或者非重叠时隙。在重叠时隙中,TBS会在时间上重叠。如图7所示,在TTI里第一个TBS使用其中标有“A”的资源单元。一个资源单元是一个代码在一个时隙中的使用。第二个TBS拥有“B”资源单元。如图7所示,在第二个时隙中,第一和第二个TBS都传递。因此,这两个TBS的传输在时间上重叠。
在非重叠TBS中,每个时隙只包含TTI的一个TBS。如图8所示,第一个TBS(“A”)是时隙1和时隙2里的唯一的一个TBS。第二个TBS(“B”)是时隙3和时隙4里的唯一的一个TBS。
在FDD/CDMA通信系统中,比如在第三代合作伙伴项目所提出的系统中,传输是同时进行的。在FDD/CDMA系统中,每个TBS较佳地分配一个不同代码/频率对以用于传输。在OFDM系统中,每个TBS较佳地分配一个单独的副载波以用于传输。

Claims (1)

1.一种用于接收传输时间间隔的数据的用户设备,该传输时间间隔数据使用自适应调制和编码,所述用户设备使用用于所接收的传输时间间隔数据的物理层混合自动重复请求机制,该用户设备包括:
一个接收器,耦合一根天线,用于接收所述传输时间间隔数据,该传输时间间隔数据具有具有多个传输块设置并且采用第一种规定的调制和编码机制来发送,且该接收器用于接收至少一个重传的传输块设置,该至少一个重传的传输块设置采用第二种不同规定的调制和编码机制来发送;
一个混合自动重复请求解码器,耦合到所述接收器,用于确定是否每个所述传输块设置的数据符合规定的质量,并将所述至少一个重传的传输块设置与对应的先前接收的传输块设置结合;
一个自动重复请求发送器,用于当所述规定的质量未得到满足时发送一个重复请求。
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CN101379752B (zh) * 2006-02-03 2013-05-22 交互数字技术公司 在每个传输时间间隔中支持多个混合自动重复请求进程的方法和系统
CN101843050B (zh) * 2007-10-31 2013-11-27 高通股份有限公司 与对等通信系统中的业务调度和速率控制相关的通信方法和装置
CN109565421A (zh) * 2016-08-12 2019-04-02 联发科技股份有限公司 基于传输时间间隔以设定分割阈值的数据传输方法和装置
CN109565421B (zh) * 2016-08-12 2021-08-06 联发科技股份有限公司 基于传输时间间隔以设置分割阈值的数据传输方法、装置

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