CN201378834Y - 用于控制混合自动重复请求资源的分配的无线发射/接收单元 - Google Patents
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Abstract
公开了一种用于控制混合自动重复请求(HARQ)资源的分配的无线发射/接收单元,其中可以再次使用预留HARQ进程标识(ID)。预留多个HARQ进程ID的子集以用于半持续分配,且基于该半持续分配发送数据。经由物理下行链路控制信道(PDCCH)接收动态分配。基于动态分配选择性地使用至少一个预留HARQ进程ID以用于发送数据。
Description
技术领域
本申请涉及无线通信。
背景技术
上行链路(UL)和下行链路(DL)调度的基础是动态调度。在长期演进(LTE)无线通信系统中,调度信息在传输时间间隔(TTI)期间经由物理下行链路控制信道(PDCCH)被传输到无线发射/接收单元(WTRU)。无线电接入网络(RAN)工作组(即,RAN2)已经同意在长期演进(LTE)中支持DL和UL的半持续调度。针对传输时间间隔(TTI)中的半持续调度的无线发射/接收单元(WTRU),不需要为初始数据传输发送DL/UL授权。唯一的例外是演进型节点B想要覆盖(override)持续资源分配,根据定义这应该是很少发生的。否则,会失去DL/UL持续资源分配的唯一目的。作为网络电话(VoIP)的优化,持续调度用于DL和UL,在DL和UL上持续分配用于初始传输的资源并动态分配用于混合自动重复请求(HARQ)重新传输的资源。
对于DL,必须为重新传输特别指定HARQ进程标识(ID),这是因为从发生重新传输的TTI中不能对具有相同ID的传输进行推断(由于DL重新传输的不同步性)。对于动态调度,这是经由DL授权信令来实现的。对于TTI中的半持续调度的WTRU,不为初始传输发送DL授权,且任意后续的自适应重新传输需要显式的指示用于重新传输的HARQ进程ID的DL授权。
解决方案包括WTRU和eNB假定下一个可用HARQ进程ID用于持续调度DL传输。但是,在出现错误时该过程不够稳固。
当为持续传输预留HARQ进程时,留给动态传输的HARQ进程便显得很有限了。这样,如果一些HARQ进程成功完成传输且在长时间不能被其他服务使用,则只为持续传输预留这些HARQ进程是很低效的。
因此,需要一种用于减轻以上低效率和忧虑的方法。
实用新型内容
公开了一种有效利用HARQ进程进行半持续和动态数据传输的设备,其中可以重新使用预留的HARQ进程ID。预留多个HARQ进程ID的子集以用于半持续分配并基于该半持续分配传输数据。经由PDCCH接收动态分配。基于动态分配,至少一个预留的HARQ进程ID被选择性地用于传输数据。
附图说明
从以下以示例方式给出的描述并结合附图可以得到更详细的理解,其中:
图1示出了被配置成有效利用HARQ进程的无线通信系统;
图2示出了下行链路中系统帧号和预留HARQ进程ID之间的关系的示例;
图3示出了用于持续重新传输和动态分配的信令的示例;以及
图4是有效利用HARQ进程进行半持续和动态数据传输的过程的流程图。
具体实施方式
下文提及的术语“无线发射/接收单元(WTRU)”包括但不限于用户设备(UE)、移动站、固定或移动用户单元、寻呼机、蜂窝电话、个人数字助理(PDA)、计算机或能工作在无线环境下的任何类型的用户设备。
下文提及的术语“演进型节点B(eNB)”包括但不限于基站、站点控制器、接入点(AP)或能工作在无线环境下的任何类型的接口设备。
图1示出了包括WTRU 105和eNB 110的无线通信系统100,WTRU 105和eNB 110通过PDCCH 115和物理上行链路控制信道(PUCCH)120进行通信。WTRU 105包括发射机125、接收机130、处理器135和缓存器140。eNB 110包括发射机145、接收机150和处理器155。
以下公开了一种用于有效利用DL和UL HARQ资源的方法。在DL中,如果为半持续传输预留了HARQ进程ID的子集,则当与某种预留的HARQ进程ID相关联的数据已经被成功传输时(即,从WTRU 105接收应答(ACK))和在下一个相关的系统帧号(SFN)时刻使用预留的HARQ进程ID之前,该预留的HARQ进程还可以用于动态分配。例如,如果一个HARQ进程m被预留与奇数SFN相关联,如图2所示,且然后如果HARQ进程m在SFN1开始传输且在SFN2之前结束,则动态调度可以使用该HARQ进程m。这样,HARQ进程m可以被充分利用而不会浪费资源。此外,动态分配可以覆盖已有HARQ进程m由此该过程不会完成其传输。
可替换地,当所有未预留的HARQ进程用尽(或不可用)且预留的HARQ进程已经成功传输分组或达到最大重新传输数量,或在用于持续传输的相关SFN处使用该HARQ进程之前用于动态分配和传输的时间足够长时,动态分配将使用预留的HARQ进程。
可以在持续分配设置期间在无线电资源控制(RRC)消息中用信号发送是否将所述预留HARQ进程ID用于在使用相同的预留HARQ进程ID的两个相关SFN之间的动态调度。例如,该配置可以与预留HARQ ID安置在一起。当激活DL持续调度时,该配置也可以在PDCCH中用信号发送。
图2示出了为DL持续调度预留的HARQ进程和相关的SFN的示例。在图2中,SFN1指的是奇数SFN和SFN2指的是偶数SFN。SFN1和SFN2在这里用作显示在奇数和偶数SFN时刻传输初始分组的示例。阴影矩形代表重新传输的分组。作为示例,HARQ进程m和n被预留给DL持续调度。当发送初始传输时,SFN与HARQ进程ID相联系。这样,当在奇数SFN中发送初始传输时,通过HARQ进程m发送重新传输。根据图2中示出的该示例,当在偶数SFN中发送初始重新传输时使用HARQ进程n,且HARQ进程m用于重新传输3次。图2中的NACK表示在DL中使用HARQ进程m的传输失败,由此WTRU 105发送NACK到eNB 110,使得eNB 110将使用HARQ进程m来重新传输。
仍然参考图2,一旦一个预留DL HARQ进程m在下一个连续奇数SFN使用HARQ进程进行新DL持续传输之前成功完成DL持续传输,例如在两个奇数SFN之间,则如果所有未预留HARQ进程用尽(或不可用),eNB 110可以使用HARQ进程x进行动态调度。因此,WTRU 105可以区分来自相同的HARQ进程数据是用于持续重新传输还是用于使用显式信令的新的动态分配。当共享预留的HARQ进程例如HARQ进程ID m时,PDCCH信令可被用于显式信令动态调度。
如果在WTRU 105成功接收DL持续数据并发送应答(ACK)到eNB 110之后或者在已经达到最大重新传输数量之后,发生使用预留的HARQ进程的DL分配,则PDCCH中的新的数据指示符(NDI)可以向WTRU 105指示这是用于新的动态调度的。WTRU 105还可以确定重新传输是否来自重新传输序列号(RSN)。而且,PDCCH上携带的DL调度授权可以使用一个比特来指示DL调度是用于动态分配还是用于持续分配。
如果当预留的HARQ进程必须用于DL持续传输时使用该预留的HARQ进程的DL动态传输在下一个SFN之前不能被成功接收,则任何DL动态传输应当被暂停且WTRU 105应当清空存储使用预留HARQ进程的DL动态传输数据的缓存器140。
在用于新DL持续传输的下一个即刻的相关SFN的预留HARQ进程m之前需要出现至少一个传输时间间隔(TTI)。缓存器140存储用于与预留HARQ进程m相关联的正在进行的动态传输的数据。缓存器140应当被清空且用于HARQ进程m的参数应当被重置到用于初始DL持续传输的配置。
可替换地,除了为DL持续传输预留HARQ进程ID的子集,还可以为UL持续传输预留HARQ进程ID的子集(优选为多于一个)。当预留HARQ进程已经成功完成UL持续传输或已经达到最大重新传送数量,且在使用用于UL持续传输的下一个相关SFN中的相同HARQ进程之前仍有时间时,用于UL持续传输的预留HARQ进程ID还可以用于UL动态传输。可以使用用于UL动态调度的未预留HARQ进程,且一旦未预留HARQ进程都被使用,之后可以使用预留HARQ进程。
如果HARQ进程ID的子集将被预留用于UL持续传输,则可在UL持续调度设置进程期间在RRC中用信号将其发送。如以上针对DL所描述的,是否将预留HARQ进程ID用于在使用相同预留HARQ进程ID的两个相关SFN之间的UL动态调度的配置可以在持续分配设置期间在RRC消息中用信号发送。例如,该信令可以与预留HARQ ID放在一起。可替换地,在激活UL持续分配时,该配置可以在PDCCH中用信号发送。
如果WTRU 105在用于UL持续传输的下一个相关SFN之前接收具有预留HARQ ID和用于指示新分组的NDI的UL授权,则WTRU 105通过再使用(或共享)预留HARQ进程来了解该UL授权是用于动态调度,且该WTRU 105可以开始将该HARQ进程和被分配的参数用于UL动态传输。
如果WTRU 105检测到ACK,但同时接收到具有用来指示重新传输的相同HARQ进程ID的UL授权,则WTRU 105知道将否定应答(NACK)错误的检测为ACK,且UL分配仍用于进行中的UL持续传输的重新传输。
如果WTRU 105检测到NACK,但同时接收到具有预留HARQ进程ID和指示新的数据分组的NDI,则WTRU 105知道将ACK检测为NACK并且新UL授权是用于在下一个SFN之前的动态调度的,并因此WTRU 105使用预留HARQ进程。
如果WTRU 105在预期时间没有检测到ACK或NACK,则WTRU 105知道ACK/NACK丢失。如果WTRU 105后来检测到使用具有指示新数据分组的NDI的预留HARQ进程的UL授权,则WTRU 105知道DL ACK丢失且该预留HARQ进程用于动态调度。否则,如果WTRU 105检测到使用预留HARQ进程ID的UL授权,但是RSN指示重新传输,则WTRU 105知道DL NACK丢失且所述分配是用于持续重新传输的。
如果WTRU 105在下一个SFN开始使用用于持续传输的相同预留HARQ进程t之前X个TTI(例如一个)为UL动态传输预留HARQ进程,则WTRU 105清空具有与HARQ进程t相关联的未完成的UL动态传输的缓存器140,以便为下一个UL持续传输做准备。
公开了一种针对用于持续重新传输和动态传输的分配的PDCCH信令的方法。根据该方法,无论针对重新传输的分配是否用于相同的初始传输避免在WTRU 105的模糊性,都存在多个方式用信号通知WTRU 105。如果HARQ进程ID与RSN一起被包含在用于持续调度的重新传输的DL分配中,则有可能不需要为持续调度预留HARQ进程的子集也可以在WTRU 105避免模糊。
SFN可以用于传输和重新传输(DL/UL)的持续分配,且HARQ ID可以用于针对初始传输和重新传输的动态分配。当为重新传输做出资源分配时,只有HARQ进程ID被包含在PDCCH中用于动态分配。这样,PDCCH中没有HARQ进程ID用于持续传输。当eNB 110做出DL或UL资源分配时,eNB 110不能对任何未完成的动态传输和持续传输使用相同HARQ进程。这样,WTRU 105能够知道DL或UL分配是否用于动态传输和持续传输。
使用用于持续分配的SFN可以在不同持续传输周期之间产生差别。图3示出使用用于持续和动态分配的SFN和HARQ ID的示例操作。例如,当用于初始持续传输的重新传输在SFN2后发生时,如果SFN1基于信令中的RSN值在用于SFN1分组的重新传输的持续分配中使用,则WTRU 105将很明确地区分是将该分配与SFN1分组结合还是与SFN2分组结合。
当预留HARQ ID由WTRU 105接收以用于资源分配时,所述WTRU 105知道预留HARQ进程已经完成其持续传输并可被用于动态分配。例如,在图3中,一旦HARQ ID2(假定其已被映射到SFN2)已经成功完成持续传输,则HARQ ID 2可以用于动态分配,且如果WTRU 105解码了资源分配中的HARQ ID 2,则WTRU 105知道该HARQ进程是用于动态分配的。尽管在该示例中使用的是PDCCH 115,但是相同的原理对PUCCH 120也是适用的。
优选地,持续传输的激活时间足够长从而使得eNB 110能够知道WTRU105是否已经成功解码包含在PDCCH中的激活信令。为了确保WTRU 105成功接收用于DL/UL持续调度激活的PDCCH,WTRU 105发送ACK/NACK到eNB 110以用于持续激活信令,由此eNB 110可以为同步DL或UL持续传输重新发送持续激活信令。如果该机制将被使用,那么UL ACK/NACK资源的分配应当被预先确定。
再次参考图1,WTRU 105控制HARQ资源的分配。处理器135被配置成预留多个HARQ进程ID的子集以用于半持续分配。接收机被配置成经由DL PDCCH接收动态分配。发射机125被配置成基于半持续分配发送数据,并基于动态分配选择性地使用至少一个预留HARQ进程ID来发送数据。
与至少一个预留HARQ进程ID相关联的HARQ进程可以在两个不同SFN时刻之间的时间段被用于发送数据。当与至少一个预留HARQ进程ID相关联的数据已在之前被发送时,直到下一个相关SFN时刻都可以不使用预留HARQ进程ID。可以在已经使用所有未预留HARQ进程ID后使用预留HARQ进程ID。预留HARQ进程ID可以由较高优先级服务使用。预留HARQ进程ID可以被包含在RRC消息中。
图4是有效利用HARQ进程进行半持续和动态数据传输的过程400的流程图。在步骤405,预留多个HARQ资源的子集以用于半持续分配。在步骤410,基于半持续分配传输数据。在步骤415,经由DL PDCCH接收动态分配。在步骤420,基于所述动态分配选择性地使用至少一个预留HARQ进程ID用于传输数据。
虽然本实用新型的特征和元素在优选的实施方式中以特定的结合进行了描述,但每个特征或元素可以在没有所述优选实施方式的其他特征和元素的情况下单独使用,或在与或不与本实用新型的其他特征和元素结合的各种情况下使用。本实用新型提供的方法或流程图可以在由通用计算机或处理器执行的计算机程序、软件或固件中实施,其中所述计算机程序、软件或固件是以有形的方式包含在计算机可读存储介质中的,关于计算机可读存储介质的实例包括只读存储器(ROM)、随机存取存储器(RAM)、寄存器、缓冲存储器、半导体存储设备、内部硬盘和可移动磁盘之类的磁介质、磁光介质以及CD-ROM碟片和数字多功能光盘(DVD)之类的光介质。
举例来说,恰当的处理器包括:通用处理器、专用处理器、传统处理器、数字信号处理器(DSP)、多个微处理器、与DSP核心相关联的一个或多个微处理器、控制器、微控制器、专用集成电路(ASIC)、现场可编程门阵列(FPGA)电路、任何一种集成电路(IC)和/或状态机。
Claims (6)
1、一种用于控制混合自动重复请求资源的分配的无线发射/接收单元,其特征在于,该无线发射/接收单元包括:
处理器,该处理器被配置成预留多个混合自动重复请求进程标识的子集以用于半持续分配;
与所述处理器耦合的接收机,该接收机被配置成经由物理下行链路控制信道接收动态分配;以及
与所述处理器耦合的发射机,该发射机被配置成基于所述半持续分配发送数据,并基于所述动态分配而选择性地使用至少一个预留混合自动重复请求进程标识以用于发送数据。
2、根据权利要求1所述的无线发射/接收单元,其特征在于,在两个不同系统帧号时刻之间的时间段使用与至少一个预留混合自动重复请求进程标识相关联的混合自动重复请求进程来发送数据。
3、根据权利要求2所述的无线发射/接收单元,其特征在于,与所述至少一个预留混合自动重复请求进程标识相关联的数据在之前已被发送,且在下一个相关联系统帧号时刻之前不使用该预留混合自动重复请求进程标识。
4、根据权利要求1所述的无线发射/接收单元,其特征在于,在已经使用所有未预留混合自动重复请求进程标识之后使用所述预留混合自动重复请求进程标识。
5、根据权利要求1所述的无线发射/接收单元,其特征在于,所述预留混合自动重复请求进程标识由较高优先级服务使用。
6、根据权利要求1所述的无线发射/接收单元,其特征在于,所述预留混合自动重复请求进程标识被包含在无线电资源控制消息中。
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| JP6568184B2 (ja) | 永続的リソースの解放を信号送出するための方法および装置 |
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