CN102739381B - 无线发射/接收单元和方法 - Google Patents

无线发射/接收单元和方法 Download PDF

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CN102739381B
CN102739381B CN201210229395.3A CN201210229395A CN102739381B CN 102739381 B CN102739381 B CN 102739381B CN 201210229395 A CN201210229395 A CN 201210229395A CN 102739381 B CN102739381 B CN 102739381B
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史蒂芬·E·泰利
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InterDigital Technology Corp
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Abstract

本发明提供一种无线发射/接收单元（WTRU）和一种方法。所述WTRU包括：至少一个电路，该至少一个电路被配置成使用多个同步混合自动重复请求（HARQ）过程中的至少一者来传送增强型专用信道媒体存取控制（MAC-e）协议数据单元（PDU）；其中所述至少一个电路还被配置成以设置为零的变量初始传送所述MAC-e PDU，以及针对所述MAC-e PDU的至少一个重传递增该变量；其中针对所述MAC-e PDU选择的增强型上行链路数据被选择以最大化高优先级数据的传输；以及其中所述至少一个电路还被配置成传送所述MAC-e PDU与所述MAC-e PDU相关联的传输区块大小的指示。

Description

无线发射/接收单元和方法
本申请是申请号为200580018200.9、申请日为2005年6月3日、名称为“动态调整数据传输参数及控制H-ARQ程序的方法及装置”的中国发明专利申请的分案申请。
技术领域
本发明是关于一种包含一无线发射/接收单元(WTRU)及一节点B的无线通讯系统，本发明尤其是关于一种方法及装置，用以动态调整数据传输参数，例如调制及编码机制(MCS)和传输区块集合(TBS)大小，且分派和释放用于控制介于该WTRU和该节点B之间的混合自动重复请求(H-ARQ)程序。
背景技术
在第三代蜂窝式系统中，适应性调制和编码(AM&C)及H-ARQ机制己经被研究用来整合至增强上链(ED)运作，其是设计用来提供较低的传输等待时间、较高的生产率、以及物理资源更有效的使用。
AM&C机制允许在一传输时间间隙(TTI)基础上动态地调整MCS，借此对每一TTI来说，该MCS是选用使无线资源能做更有效的使用，且提供最高的可能数据率。一个较不健全的MCS会使用较少的物理资源，但会更容易出错，较健全的MCS使用较多的物理资源，但在防止错误方面提供了较多的保护。
H-ARQ机制是用来产生具有较低等待时间的传输和重新传输，H-ARQ机制的主要方向是在失败传输所接收的数据能与接续重新传输做软性组合，以增加成功接收的机率，还可使用追踪组合(ChaseCombining,CC)或是增额冗余(incrementalredundancy,IR)。当使用CC时，会选用相同的MCS来重新传输，当使用IR时，在每次重新传输会使用较健全的MCS。
发明内容
本发明是于一无线通讯系统中执行，该系统包含一WTRU将数据传输至一节点B。类似TB大小的数据传输参数是在一TTI基础中动态地调整，选择性地，也可调整MCS。用以控制介于该WTRU和该节点B之间数据传输的H-ARQ程序，视所需分派和释放。WTRU通过一增强上链(ED)专用信道(E-DCH)以传输和重新传输数据至节点B，其是根据接收来自该节点B的反馈信息。该WTRU储存传输数据于队列上，并决定该数据的传输状态，传输状态是由在该WTRU中的控制器设定为「新传输」、「成功传输」、「重新传输」以及「重新启动传输」。在每一TTI期间，该WTRU初始化一EU传输至该节点B，其明示地或暗藏地标识重新传输数量、新数据指示、分派H-ARQ程序、TBS大小及选择性地MCS。
当数据为新数据时，数据传输状态会由在该WTRU中的控制器设定为「新传输」。当收到来自该节点B的确认(ACK)讯息时，则设定为「成功传输」。都为收到来自节点B的非确认(NACK)讯息，或是未收到来自该节点B相应该新数据传输的响应时，则设定为「重新传输」。当重新传输计数超过一预设重新传输最大值时，选择性地设定为「重新启动传输」。
如果传输状态为「新传输」，则会分派一初始化H-ARQ程序。如果传输状态为「重新传输」，则分派相同的H-ARQ程序，同时该重新传输计数器会增量。如果传输状态为「成功传输」，则释放该H-ARQ程序。如果该传输状态为「重新启动传输」，其是选择性地，则会分派-H-ARQ程序，同时初始化该重新传输计数器，并且增量一新数据指示符(NDI)。
附图说明
借由下文中一较佳实施例的描述、所给予的范例，并参照对应的附图，本发明可获得更详细地了解，其中：
图1所示为根据本发明运作的无线通讯系统方块图；
图2所示为根据本发明初始化和释放H-ARQ程序的程序流程图；
图3所示为根据本发明包含执行CC方法步骤的程序流程图；以及
图4所示为根据本发明包含执行IR方法步骤的程序流程图。
具体实施方式
此后，专用术语「WTRU」包含但并未限制于一用户设备(UE)、一移动台、一固定或移动用户单元、一呼叫器或可在一无线环境下操作的任何形式的装置。当本文此后提到专用术语「节点B」，其包含但并未限制于一基地台、站台控制器、一存取点或是在无线环境下任何结识的接口装置。
本发明的特征可整合至一集成电路(IC)，或是配置在包含许多相互连接组件的电路上。
图1所示为根据本发明的无线通讯系统100的方块图，该系统100包含一WTRU102、一节点B104以及一无线网络控制器(RNC)106。该WTRU102通过一E-DCH108以一传输器120传输数据，且通过一下链(DL)信号发送信道110以一接收器122接收来自该节点B104的反馈，其是基于一一初始化的H-ARQ程序。当该节点B无法译码由该WTRU102发送的数据时，该节点B便会经由该DL信号发送信道110传输一NACK讯息至该WTRU102，或是不传输会被WTRU102解译为NACK的反馈。当该节点B成功的将该WTRU102发送的数据译码时，该节点B104会传输一ACK讯息至该WTRU102，其会释放该H-ARQ程序给其它传输，该H-ARQ程序可设计为执行CC或IR。该RNC106控制发生在该节点B104和该WTRU102之间数据传输的整体运作，包含无线资源分配。该WTRU102包含一数据缓冲器112，用以储存E-DCH数据、一选择性的数据使用期限定时器114，用以判定是否要丢弃到期的数据、以及一重新传输定时器116，用以判定由该WTRU102传输但未由该节点B104所接收的数据是否重新传输，或是H-ARQ传输是否应该终止，或是选择性地重新启动。该缓冲器112、该使用期限定时器114以及该重新传输定时器116是由一控制器118控制，该控制器118设定(也即记录)关于H-ARQ程序的每一传输状态。
图2所示为根据本发明包含控制H-ARQ程序方法步骤的程序200流程图，该H-ARQ程序可为同步或是非同步。在同步H-ARQ运作中，该WTRU102会记录预期响应介于WTRU102及节点B104间的数据传输的时间，以及预设H-ARQ重新传输的周期。在非同步H-ARQ运作中，该WTRU102传输数据并在一预设时间内等待反馈。
在该WTRU102初始化该H-ARQ程序及该重新传输计数器116后，该WTRU102经由E-DCH108在一现行TTI期间传输数据至该节点B104(步骤202)。在步骤204中，该WTRU102会等待来自节点B104的反馈，如果该WTRU102接收到来自节点B104的ACK讯息，则该WTRU102接着设定该传输状态为「成功传输」，并释放该H-ARQ程序，且为接续的数据传输重新初始化该重新传输计数器116(步骤208)。
在步骤206中，如果该WTRU102收到一NACK讯息，或是并未收到任何响应，则该WTRU102会判定由该重新传输计数器116所指示的重新传输计数是否小于或等于允许重新传输的最大值(步骤212)。
如果在步骤212所判定的重新传输计数小于允许重新传输的最大值，则该WTRU102会设定或维持该传输状态为「重新传输」并增量该重新传输计数器116(步骤214)，该重新传输计数器116在每一次相同数据由该WTRU102重新传输时便增量。
如果在步骤212所判定的重新传输计数等于或大于允许重新传输的最大值，则会终止该H-ARQ程序传输，并且重新设定以支持接续的数据传输(步骤213)，选择性地，该WTRU102可设定传输状态为「重新启动传输」并重新初始化该重新传输计数器(步骤216)。在设定该传输状态为「重新启动传输」之后，该WTRU102便会初始化该H-ARQ传输程序为「新传输」，或是该WTRU102可选择性地释放该H-ARQ程序(步骤218)。
图3所示为根据本发明包含执行CC方法步骤的程序300流程图，该程序300是于一TTI基础上执行(步骤302)。在步骤304中，该WTRU102判定EU物理资源是否己经由节点B104分派，且一H-ARQ程序是否可供该WTRU102使用，以经由该E-DCH108传输数据至该节点B104。如果EU物理资源尚未分派，则该WTRU102等待EU物理资源的分配且数据传输会延迟至下一个TTI(步骤302)。如果EU物理资源已经分配，且有可用的H-ARQ程序，则该WTRU102会判定该数据是否为新数据(步骤306)。如果该数据在步骤306中被判定为新数据，则该WTRU102会选择最高优先级数据以传输(步骤308)。此外，该WTRU102选择在一许可限制内可最大化该最高优先级数据传输的MCS及TBS大小(步骤310)。TBS大小的选择是基于该节点B104发送最大MCS、TBS大小、可供E-DCH108传输功率、MCS及在缓冲器112中可供传输的数据。
对每一传输信道(TrCH)、专用信道媒体存取控制(MAC-d)流或是逻辑信道而言，会决定允许TBS大小、重新传输限制及允许传输等待时间(也即MAC数据「使用期限」)的列表，该允许MCS及TBS大小皆是WTRU102被允许在现行物理资源分配周期传输中传输的最大量，这些配置是由该RNC106根据无线资源控制程序发送，或是由一标准特定描述。所选的MCS及TBS大小可明示地发送(较佳地是从节点时，或是由一相关参数获得，例如信道质量指示符(CQI)及/或传输格式组合(TFC)索引，该信道质量指示符可表示最大允许WTRU干扰或是传输功率。该节点B104可于初始信道分派中发送此讯号，或者该节点B104可在当WTRU102请求额外的EU信道分配时送出此信息。
在步骤312中，该WTRU102接着基于所选的TBS大小，产生至少一EUMAC(MAC-e)协议数据单元(PDU)，并且在分派一H-ARQ程序以供该MAC-ePDU传输。在步骤314中，该WTRU102初始化该重新传输计数器116，增量一NDI并且选择性地设定在该WTRU102中的该使用期限定时器114。该NDI是用来指示新数据何时传输，以及该节点B何时需要清除关于被传输的H-ARQ程序的软性缓冲器。该重新传输计数器116的初始值可解译为新数据的传输，且在此例中并不需要NDI参数。该WTRU102接着初始化一EU传输至节点B以标识现行的H-ARQ程序、TBS大小(如果并非由节点B104所分派)、以及MCS。由于一特定的H-ARQ程序运作，该H-ARQ程序及MCS可由该节点B104暗藏地知晓，因此可能不需要由该WTRU102发送至该节点B104。
当支持CC时，每一次传输和重新传输，该TBS大小信息便由该节点B104识别，除非在物理信道分配时TBS是由该节点B104所识别。在CC的例子中，重新传输具有与初始传输所使用相同的MCS及TBS。
参照步骤306，如果判定该数据并非新数据，则会决定该WTRU102是否使用该使用期限定时器114(步骤315)。如果WTRU102使用该使用期限定时器114，则程序300会进行至步骤316，以判定该使用期限定时器114是否己经到期。如果该使用期限定时器114已经到期，则该WTRU102丢弃该数据并释放该H-ARQ程序(步骤318)，且程序300会回到步骤302。选择性地，当该使用期限定时器114接近到期时，该WTRU102可使用更健全的MCS以增加成功传输的可靠性。
在该WTRU102中的重新传输计数器116会在每一次数据未成功传输且因此未由该节点B104所确认时增量。如果该使用期限定时器114尚未到期，或如果该WTRU102未使用该使用期限定时器114，该程序300会进行步骤320以重新传输该数据，借此该WTRU102判定该重新传输计数是否小于允许重新传输的最大值。如果重新传输计数小于允许重新传输最大值，则该传输状态会设定或维持在「重新传输」，该WTRU102增量该重新传输计数器116(步骤322)，并使用相同的H-ARQ程序、TBS、MCS和NDI(如果未整合至重新传输计数器中)(步骤324)。该WTRU102接着初始化一EU传输至该节点B104以在相关物理控制信道中标识该H-ARQ程序(这可能由节点B隐式知道且不需要发送至节点B)、TBS大小(如果不是由该节点B指派)、以及MCS(步骤330)。
如果重新传输计数达到或超过允许重新传输的最大值时，该程序300会进行步骤318，以丢弃该数据并释放该H-ARQ程序。或者如果在选择性的步骤325中允许决定重新启动传输的话，该传输状态会设定为「重新启动传输」,且该WTRU102会初始化该重新传输计数器116，增量该NDI并分派一新的H-ARQ程序(步骤326)。如果先前储存于该软性组合缓冲器中的传输数据中断接续重新传输的话，最好是清除该软性缓冲器且重新启动该H-ARQ传输，以便增加成功传输的机率。因此当达到一特定H-ARQ程序的重新传输最大量时，该NDI(或是一初始化重新传输计数)便会送出以指示H-ARQ传输已经重新启动。当该节点B104接收到该增量NDI(或是传输计数设定为初始值)，该节点B104会清光该先前接收数据的软性组合缓冲器。
在步骤328中，一个使用相同TBS的新H-ARQ传输会被初始化，且选择性地可为该「新传输」选择一个更健全的MCS以增加成功送达的机率(步骤328)。为了允许MCS的改变，该TBS可分段成数个独立的传输，在此例中传输会带着更多的冗余重新初始化(不论是通过MCS改变或是使用较少的位)，先前的TBS可能不再符合分配的物理资源，在此例中原始传输可分段成数个分离的传输，其不会超出需求。该WTRU102接着初始化一EU传输至该节点B，其在相关物理控制信道中标识现行的H-ARQ程序(可暗藏地由该节点B所知)、TBS大小及MCS(如果不是由该节点B分派)(步骤330)。
图4所示为根据本发明包含执行IR方法步骤的程序400流程图，该程序400是于一TTI基础上执行(步骤402)。在步骤404中，该WTRU102判定EU物理资源是否己经由该节点B104分派，且是否有一H-ARQ可供WTRU使用，以经由E-DCH108传输数据至该节点B104(步骤404)。如果EU物理资源尚未被分派，则该WTRU102等待EU物理资源的分配，且该数据传输会延迟直到下一个TTI(步骤402)。如果EU物理资源已经分配且有可用的H-ARQ程序，则该WTRU102会判定该数据是否为新数据(步骤406)。如果该数据在步骤406中被判定为新数据，则该WTRU102选择最高优先级数据传输(步骤408)。此外，该WTRU102会选择最大的TBS大小，以及该最高优先级数据的对应TFC最大化传输，其使用所允许的最健全的MCS(步骤410)。
在步骤412中，该WTRU102接着产生至少一MAC-ePDU，其是基于所选的TBS大小，且分派一H-ARQ程序给MAC-ePDU的传输。在步骤414中，该WTRU102初始化该重新传输计数器116，增量一NDI且选择性地设定在WTRU102中的使用期限定时器114(步骤414)。该NDI是用来指示新数据被传输的时间以及该节点B104需要清空关于被传输的H-ARQ程序的软性缓冲器的时间。该重新传输计数器116的初始值可视为新数据的传输，在此例中，便不需要NDI参数。该WTRU102接着初始化EU传输至该节点B104以在相关物理控制信道中标识该现行H-ARQ程序、TBS大小及MCS(步骤430)。由于一特定的H-ARQ程序运作，该H-ARQ程序及MCS可暗藏地由该节点B104知晓，且因此便不需要由该WTRU102发送至该节点B104。
参照步骤406，如果判定该数据并非新数据，则会决定该WTRU102是否使用该使用期限定时器114(步骤415)。如果WTRU102使用该使用期限定时器114，则程序400会进行至步骤416，以判定该使用期限定时器114是否已经到期。如果该使用期限定时器114已经到期，则该WTRU102丢弃该数据并释放该H-ARQ程序(步骤418)，且程序400会回到步骤402。选择性地，当该使用期限定时器114接近到期时，该WTRU102可使用更健全的MCS以增加成功传输的可靠性。
在该WTRU102中的重新传输计数器116会在每一次数据未成功传输且因此未由该节点B104所确认时增量。如果该使用期限定时器114尚未到期，或如果该WTRU102未使用该使用期限定时器114，该程序400会进行步骤420以重新传输该数据，借此该WTRU102判定该重新传输计数是否小于允许重新传输的最大值。如果重新传输计数小于允许重新传输最大值，则该传输状态会设定或维持在「重新传输」，该WTRU102增量该重新传输计数器116，且如果许可的话，选择更健全的MCS(步骤422)，在步骤424中，该WTRU102使用相同的H-ARQ程序、TBS/TFC及NDI。
在IR方面，MCS和TBS大小的决定需考虑到最健全MCS的支持、该数据的需求是什么、哪一个在WTRU102中等待传输、以及可用的WTRU传输功率。在每一次重新传输时，可能为相同的TBS选择更健全的MCS。较不健全的MCS的初始传输可允许较大的TBS大小，但此大小会受到限制使得相同的TBS仍可由更健全的MCS支持。同样地，在TBS决定方面，该WTRU的EU可用传输功率必须考虑到所能允许的最健全MCS，即便成功传输不需要最健全的MCS。
如果重新传输计数达到或超过允许重新传输的最大值时，该程序400会进行步骤418，以丢弃该数据并释放该H-ARQ程序。或者如果在步骤425中允许决定重新启动传输的话，该传输状态会设定为「重新启动传输」，且该WTRU102会初始化该重新传输计数器116，增量该NDI并分派一新的H-ARQ程序(步骤426)。在步骤428中，使用相同TBS/TFC并选择一MCS。
尽管本发明的特征和组件皆于实施例中以特定组合方式所描述，但实施例中每一特征或组件能独自使用，而不需与其它特征或组件组合，也能与/不与本发明的其它特征和组件做不同的组合。
尽管本发明己经通过较佳实施例描述，其它不脱附本发明的申请专利范围的变型对熟悉本技术的人士来说还是显而易见的。

Claims (6)

1.一种无线发射/接收单元(WTRU)，该WTRU包括：
用于分配数据以在增强型专用信道(E-DCH)上传输的装置，其中在所述数据为新数据的情况下，最高优先级数据被分配；
用于选择许可限制内最大化最高优先级数据的传输的传输区块大小的装置；
用于至少基于所选择的传输区块大小而产生增强型上行链路媒体存取控制(MAC-e)协议数据单元(PDU)的装置；
用于初始化重新传输计数器的装置；
用于使用同步混合自动重复请求(HARQ)过程来在所述E-DCH上传送所述MAC-ePDU的装置；以及
用于在相关物理控制信道中标识所选择的传输区块大小的装置。
2.根据权利要求1所述的WTRU，进一步包括用于经由无线电资源控制(RRC)信令接收配置信息的装置；其中所述配置信息针对每个专用信道媒体存取控制(MAC-d)流指示每个MAC-d流的HARQ重传的数量的限制。
3.根据权利要求2所述的WTRU，其中所述配置信息还指示用于在产生所述MAC-ePDU中使用的允许的传输区块大小。
4.一种由无线发射/接收单元(WTRU)实施的方法，该方法包括：
分配数据以在增强型专用信道(E-DCH)上传输，其中在所述数据为新数据的情况下，最高优先级数据被分配；
选择许可限制内最大化最高优先级数据的传输的传输区块大小；
至少基于所选择的传输区块大小而产生增强型上行链路媒体存取控制(MAC-e)协议数据单元(PDU)；
初始化重新传输计数器；
使用同步混合自动重复请求(HARQ)过程来在所述E-DCH上传送所述MAC-ePDU；以及
在相关物理控制信道中标识所选择的传输区块大小。
5.根据权利要求4所述的方法，该方法还包括：
经由无线电资源控制(RRC)信令接收配置信息；其中所述配置信息针对每个专用信道媒体存取控制(MAC-d)流指示每个MAC-d流的HARQ重传的数量的限制。
6.根据权利要求5所述的方法，其中所述配置信息还指示用于在产生所述MAC-ePDU中使用的允许的传输区块大小。
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