CN102067500B - 通信系统中的用于持久分配的分组的新数据指示符 - Google Patents
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Abstract
一种可运用于通信系统中的装置310被配置成针对半持久分配或者调度的资源确定用于新数据指示符的值。在一个实施例中,装置310包括配置成接收指示半持久调度的小区无线电网络临时标识符的处理器320。处理器320还被配置成如果新数据指示符标志的值等于第一预定义值则将根据半持久调度对具有新数据指示符标志的数据的接收视为半持久初始传输,而如果新数据指示符标志的值等于第二预定义值则视为半持久调度数据的重传。
Description
技术领域
本发明主要地涉及通信系统并且具体地涉及一种用于在无线通信系统中用信令通知用于半持久或者持久分配的发送资源的新数据指示的装置、系统和方法。
背景技术
随着无线通信系统如蜂窝电话、卫星和微波通信系统变得被广泛部署并且继续吸引数目增长的用户,迫切需要提供利用固定资源通过在宽广蜂窝区域内发送数量增长的数据的数目庞大和可变的通信设备。鉴于普遍需要针对迅速增长的客户基数和扩张的服务等级限制发射器功率和带宽,传统通信系统设计已经变得就在合理宽广的地理区域内提供可靠通信而言受到挑战。
第三代合作伙伴项目长期演进(“3GPP LTE”)项目是普遍用来对业内改进用于移动通信的通用移动电信系统(“UMTS”)以应对持续的新要求和增长的用户基数的当下努力进行描述的称谓。这一有广泛基础的项目的目标包括提高通信效率、降低成本、改进服务、利用新频谱机会和实现与其它开放标准的更佳集成。3GPP LTE项目本身并非一种生成标准的努力,但是将产生针对用于UMTS的标准的新推荐。
在控制信道资源有限的无线通信系统中已经考虑用于优化控制信道资源利用的各种技术。一种优化技术利用向用户设备指派的传输资源的持久或者半持久分配。传输资源的半持久分配一般表示持久调度的初始传输和动态调度的重传(例如在否定确认之后)。术语“持久”和“半持久”资源在3GPP通信系统的讨论中的使用一般是指类似过程,并且这里将可互换地使用它们。优化技术为下行链路(“DL”)中或者上行链路(“UL”)中的传输指派半持久资源。例如在配置成支持3GPP LTE项目的系统中,一般已经在系统设计中包括半持久和动态资源调度。
对于半持久调度,使用更高层信令和物理下行链路控制信道(“PDCCH”)信令来向用户设备(“UE”)指派定期发射/接收资源模式。例如对于时间周期为20毫秒(“ms”)的资源,利用更高层信令(例如无线电资源控制(“RRC”)信令)通知周期并且使用PDCCH来指派周期,从而允许用户设备使用预先指派的资源进行发射或者接收而无需进一步的显式层1/层2(“L1/L2”)控制信令(即无需进一步PDCCH信令)。
用户设备一般维持如下新数据指示符(“NDI”)标志的值,该NDI标志用信令向接收器通知发射的新或者重复性质。通常随着动态调度,在PDCCH中的控制信令中用信令显式通知NDI标志。然而对于半持久分配的资源调度,针对初始发射并未发射PDCCH信令并且因此并未发射NDI标志以节约发射资源。也存在的问题在于将如何针对例如基站可能在混合自动重传请求(“HARQ”)布置中响应于用于指示数据接收失败的来自用户设备的“否定确认(“NACK”)”信号而进行的数据重传用信令通知或者以别的方式处置NDI标志。用户设备需要NDI标志从而它可以将接收的数据视为新输入,或者为了可靠解释数据而应当与NDI标志组合的先前接收的数据的重复传输。NDI也用于上行链路传输。在LTE上行链路中,在PDCCH上的下行链路中发送NDI,并且用户设备基于NDI来重传或者传输新数据。
考虑如上文所述的限制,用于针对各种信令条件或者没有PDCCH的其他分配可靠地指示用于半持久分配的传输资源的NDI标志的值的系统和方法目前不可用于超前的无线应用。因而在本领域中需要一种可以针对各种资源分配布置和针对可以预见遇到的各种信令情形而在基站与用户设备之间可靠地交换NDI标志的通信系统。
发明内容
主要通过本发明的有利实施例来解决或者回避这些和其它问题并且主要通过本发明的有利实施例来实现技术优点,这些实施例包括一种可运用于通信系统中的装置,该装置被配置成针对半持久分配或者调度的资源确定用于新数据指示符的值。在一个实施例中,该装置(例如用户设备)包括配置成接收指示半持久调度的小区无线电网络临时标识符的处理器。该处理器也被配置成如果新数据指示符标志的值等于第一预定义值(例如值0),则将根据半持久调度对具有新数据指示符标志的数据的接收视为持久初始传输,而如果新数据指示符标志的值等于第二预定义值(例如值1),则将其视为半持久调度数据的重传。
在另一实施例中,该装置(例如基站)包括配置成提供指示半持久调度的小区无线电网络临时标识符的处理器。该处理器也被配置成导出具有以下值之一的新数据指示符标志:用于根据半持久调度的持久初始数据传输的第一预定义值(例如值0);以及用于根据半持久调度的半持久调度数据重传的第二预定义值(例如值1)。
在与另一方面有关的另一实施例中,该装置(例如用户设备)包括配置成根据随机接入信道过程来接收指示资源分配的随机接入响应的处理器。该处理器还被配置成将新数据指示符设置成用于与资源分配对应的混合自动重传请求过程的预定义值(例如值0),并且发起用于混合自动重传请求过程的新传输。在一个有关、但是替代的实施例中,该装置(例如基站)包括配置成根据随机接入信道过程来提供指示资源分配的随机接入响应的处理器。该处理器还被配置成根据资源分配来接收用于混合自动重传请求过程的新传输并且将预定义值(例如值0)运用于新数据指示符。
前文已经相当广泛地概括本发明的特征和技术优点以便可以更好地理解本发明的下文具体描述。下文将描述本发明的附加特征和优点。本领域技术人员应当理解可以容易地利用公开的概念和具体实施例作为用于修改或者设计用于实现本发明相同意图的其它结构或者过程的基础。本领域技术人员也应当认识到这样的等效构造并不脱离本发明的精神实质和范围。
附图说明
为了更完整地理解本发明及其优点,现在参照与以下附图结合的下文描述:
图1和图2图示了通信系统的实施例的系统级图解,这些通信系统包括提供用于应用本发明原理的环境的无线通信系统;
图3图示了用于应用本发明原理的通信系统的通信单元的一个实施例的系统级图解;
图4A和图4B分别图示了根据本发明原理的运用网际协议语音在下行链路中的示例性基于通话突发的动态调度或者半持久调度的图解;
图5图示了根据本发明原理的在半持久资源分配的情况下交替的新数据指示符标志的值的一个实施例的图解;
图6图示了根据本发明原理的针对半持久资源分配而固定的新数据指示符标志的值的一个实施例的图解;
图7图示了根据本发明原理的其中针对新数据指示符标志假设固定值的上行链路数据传输的一个实施例的图解;以及
图8A和图8B分别图示了根据本发明原理的其中针对新数据指示符标志假设了值的用于基于竞争和非基于竞争的随机接入过程的数据传输的实施例的图解。
具体实施方式
下文详细地讨论当前优选实施例的产生和运用。然而应当理解本发明提供可以在广泛多种具体上下文中体现的许多适用发明概念。讨论的具体实施例仅举例说明用于产生和运用本发明的具体方式而不限制本发明的范围。将在针对半持久分配的传输可靠地确定NDI标志的值的具体上下文中参照示例实施例描述本发明。一般而言,本发明可以应用于任何通信系统,比如蜂窝或者ad hoc(自组织)无线通信网络。
如下文将更详细介绍和讨论的那样,一种通信系统(例如包括无线蜂窝通信网络)被配置成确定用于半持久分配或者调度的资源的NDI标志的值。一种装置(例如基站)包括配置成导出NDI标志的值的处理器。处理器可以针对装置的每次传输来切换NDI标志的值。NDI标志针对持久分配也可以是固定值。也可以根据为半持久分配而保留的混合自动重传请求(“HARQ”)过程数目、系统帧号(“SFN”)和半持久周期来隐式导出NDI标志的值。该装置还包括配置成在控制信道如物理下行链路控制信道(“PDCCH”)上发射NDI标志的收发器。根据这一点,一种装置(例如用户设备)包括配置成接收NDI标志的收发器,及其配置成使数据缓冲器组合与NDI标志关联的数据与存储于缓冲器中的数据或者冲刷缓冲器并且基于NDI标志将数据作为新数据处理的处理器。
首先参照图1,图示了通信系统的一个实施例的系统级图解,该通信系统包括提供用于应用本发明原理的环境的无线通信系统。虽然图1中所示的通信系统表示蜂窝通信系统,但是ad hoc无线通信系统(比如通过引用结合于此的IEEE标准802.16描述的ad hoc无线通信系统)提供用于应用本发明原理的另一环境。无线通信系统可以被配置成提供演进UMTS陆地无线电接入网络(“e-UTRAN”)通用移动电信服务。移动管理实体/系统架构演进网关(“MME/SAEGW”,其中之一由110表示)经由S1通信链路(其中之一表示为“S1链路”)为e-UTRAN节点B(表示为“eNB”、“演进节点B”、也称为“基站”,其中之一表示为120)提供控制功能。基站120经由X2通信链路(表示为“X2链路”)通信。各种通信链路通常为光纤、微波或者其它高频金属通信路径(如同轴链路)或者其组合。
基站120与用户设备通信(“UE”,其中之一表示为130),该UE通常是用户携带的移动收发器。因此,将基站120耦合到用户设备130的通信链路(表示为“Uu”通信链路,其中之一表示为“Uu链路”)是运用无线通信信号(例如正交频分复用(“OFDM”)信号)的空中链路。
现在参照图2,图示了通信系统的一个实施例的系统级图解,该通信系统包括提供用于应用本发明原理的环境的无线通信系统。无线通信系统提供包括基站(其中之一表示为210)的e-UTRAN架构,这些基站提供朝向用户设备220的e-UTRAN用户平面(分组数据会聚协议/无线电链路控制/介质访问控制/物理)和控制平面(无线电资源控制)协议端接。基站210利用X2接口或者通信链路(表示为“X2”)来互连。基站210也由S1接口或者通信链路(表示为“S1”)连接到包括移动管理实体/系统架构演进网关(“MME/SAE GW”,其中之一表示为230)的演进分组核心(“EPC”)。S1接口支持移动管理实体/系统架构演进网关230与基站210之间的多实体关系。对于支持公共陆地移动站间交接的应用,通过移动管理实体/系统架构演进网关230经由S1接口的重新定位来支持eNB间活跃模式移动性。
基站210可以具备比如无线电资源管理这样的功能。例如,基站210可以执行比如以下功能:用户数据流的网际协议(“IP”)报头压缩和加密、用户数据流的加密、无线电承载控制、无线电准入控制、连接移动性控制、在上行链路和下行链路二者上向用户设备动态分配资源、移动性管理实体在用户设备附着时的选择、用户平面数据朝向用户平面实体的路由、寻呼消息(源于移动性管理实体)的调度和传输、广播信息(源于移动性管理实体或者操作和维护)的调度和传输以及针对移动性和调度的测量和报告配置。移动管理实体/系统架构演进网关230可以具备比如以下功能:向基站210分发寻呼消息、安全控制、出于寻呼原因而终止U平面分组、为了支持用户设备移动性而切换U平面、空闲状态移动性控制以及系统架构演进承载控制。用户设备220接收来自基站210的信息块组的分配。
现在参照图3,图示了用于应用本发明原理的通信系统的通信单元310的一个实施例的系统级图解。通信单元或者设备310可以代表而不限于代表基站、用户设备(如终端或者移动站)、网络控制单元、通信节点等。通信单元310至少包括处理器320、存储临时或者更持久性质的程序和数据的存储器350、天线360以及耦合到天线360和处理器320用于双向无线通信的射频收发器370。通信单元310可以提供点到点和/或点到多点通信服务。
通信单元(如蜂窝网络中的基站)可以耦合到通信网元,比如公共交换电信网络(“PSTN”)的网络控制单元380。网络控制单元380又可以与处理器、存储器和其它电子单元(未示出)一起形成。网络控制单元380一般提供向电信网络(如PSTN)的接入。可以使用光纤、同轴线、双绞线、微波通信或者耦合到适当链路端接单元的类似链路来提供接入。形成为移动站的通信单元310一般是用于由终端用户携带的独立设备。
通信单元310中的、可以利用一个或者多个处理设备实施的处理器320执行与它的操作关联的功能,这些功能包括但不限于对形成通信消息的个别位进行编码和解码(编码器/解码器)、信息格式化以及通信单元的总控制(控制器)(包括与资源管理(资源管理器)有关的过程)。与资源管理有关的示例功能包括但不限于硬件安装、业务管理、性能数据分析、终端用户和设备跟踪、配置管理、终端用户管理、用户设备管理、收费管理、预订和计费等。可以在与通信单元310分离和/或耦合到通信单元310的设备中执行与资源管理有关的全部或者部分特定功能或者过程的执行,从而向通信单元310传送用于执行的此类功能或者过程的结果。通信单元310的处理器320可以是适合于局部应用环境的任何类型并且可以包括作为非限制例子的通用计算机、专用计算机、微处理器、数字信号处理器(“DSP”)和基于多核处理器架构的处理器中的一个或者多个。
通信单元310的收发器370将信息调制到载波波形上用于由通信单元310经由天线360向另一通信单元发射。收发器370解调经由天线360接收的信息用于由其它通信单元进一步处理。
如上文介绍的通信单元310的存储器350可以是适合于局部应用环境的任何类型或者可以使用任何适当易失性或者非易失性数据存储技术(比如基于半导体的存储器设备、磁存储器设备和系统、光学存储器设备和系统、固定存储器和可拆卸存储器)来实施。存储于存储器350中的程序可以包括在由关联处理器执行时使通信单元能够执行如这里所述任务的程序指令。当然,存储器350可以形成用于向和从通信单元310传输的数据的数据缓冲器。如可以至少部分地通过可由例如用户设备和基站的处理器执行的计算机软件或者通过硬件或者通过其组合来实施这里描述的系统、子系统和模块的示例实施例。应该清楚,可以在如上文所示和所述通信单元中实施系统、子系统和模块。
在一个实施例中,一种装置(通信单元310,比如用户设备)的处理器320被配置成接收指示半持久调度或者资源分配的小区无线电网络临时标识符,并且如果NDI标志的值等于第一预定义值(例如值0),则将根据半持久调度对具有NDI标志的数据的接收视为持久初始传输。在这样的实例中,处理器320可以通知驻留于存储器350中的数据缓冲器冲刷存储于其中的数据。处理器320还被配置成如果NDI标志的值等于第二预定义值(例如值1),则将根据半持久调度对具有NDI标志的数据的接收视为半持久调度数据的重传(例如根据混合自动重传请求的响应于指示数据接收失败的否定确认信号)。在这样的实例中,处理器310可以使驻留于存储器350中的数据缓冲器组合半持久调度数据的重传与存储于其中的数据。此外,存储器350被配置成(例如如果NDI标志的值等于第二预定义值)存储与半持久调度关联的参数(例如用于接收数据的时间和频率分配以及调制和编码方案)。在一个有关、但是替代的实施例中,处理器320被配置成接收指示非半持久调度或者资源分配的另一小区无线电网络临时标识符,并且如果另一新数据指示符标志的值不同于先前接收的NDI标志的值,则将根据非半持久调度对具有另一NDI标志的数据的另一次接收视为新数据之一,而如果另一新数据指示符标志的值等于先前接收的新数据指示符标志的值,则将根据非半持久调度对具有另一NDI标志的数据的另一次接收视为重传数据。
在另一实施例中,一种装置(通信单元310,比如基站)的处理器320被配置成提供指示半持久调度或者资源分配的小区无线电网络临时标识符并且导出NDI标志。NDI标志具有用于根据半持久调度的持久初始数据传输的第一预定义值(例如值0)和用于根据半持久调度的半持久调度数据重传(例如根据混合自动重传请求的响应于指示数据接收失败的否定确认信号)的第二预定义值(例如值1)。处理器320还被配置成提供指示非半持久调度或者资源分配的另一小区无线电网络临时标识符并且导出另一NDI标志。另一NDI标志具有与根据非半持久调度的用于新数据的先前传输的NDI标志的值不同的值和与根据非半持久调度的用于重传数据的先前传输的新数据指示符标志的值相等的值。
在与另一方面有关的一个实施例中,一种装置(通信单元310,比如用户设备)的处理器320被配置成提供随机接入前导并且根据随机接入信道过程接收指示资源分配的随机接入响应。处理器320还被配置成将新数据指示符设置成用于与资源分配对应的混合自动重传请求过程的预定义值(例如值0),并且发起用于混合自动重传请求过程的新传输。使用新数据指示符的预定义值作为用于针对混合自动重传请求过程在用于后续传输的上行链路授权中接收的新数据指示符标志的参考。
在另一有关实施例中,一种装置(通信单元310,比如基站)的处理器320被配置成接收随机接入前导,并且根据随机接入信道过程提供指示资源分配的随机接入响应。处理器320还被配置成根据资源分配接收用于混合自动重传请求过程的新传输并且将预定义值(例如值0)运用于新数据指示符。使用新数据指示符的预定义值作为用于针对混合自动重传请求过程在用于后续传输的上行链路授权中提供的新数据指示符标志的参考。此外,存储器350被配置成存储与资源分配关联的参数。
现在参照图4A和图4B,分别图示了运用网际协议语音(“VoIP”)在下行链路中的示例性基于通话突发的动态调度或者半持久调度的图解。从图4A开始图示了VoIP分组的动态调度例子。各数据传输与控制信道(例如PDCCH)传输(下行链路分配)关联,这意味着在PDCCH上发送新传输和重传。图4A也图示了NDI位/标志的正常使用:初始分配和VoIP分组401在下行链路上传输。关联NDI标志例如设置成0。针对各新传输(402、403、404)切换NDI标志,而针对重传(405)保持NDI标志相同。因此,收发器知道是否应当组合传输与先前传输(相同NDI标志)或者是否应当冲刷缓冲器(不同NDI标志)。
现在参照图4B,图示了针对VoIP在下行链路中的基于通话突发的半持久调度例子。当业务被标识为处于通话突发开始时,利用L1/L2控制信令(例如使用PDCCH)向用户设备指派时间和频率资源以及传送格式。在原理上,无线电资源控制提供时间周期,并且也可能提供传送块大小(“TBS”)。然后,在通话突发开始时使用PDCCH一次(用于分组501的下行链路分配)以提供时间和频率分配、调制和编码方案(“MCS”)以及可能提供用于混合自动重传请求(“HARQ”)和确认/否定确认(“ACK/NACK”)资源的信息。用户设备在存储器中存储时间和频率资源以及传送格式信息。该数据使用户设备能够利用如经由无线电资源控制用信令通知的已知周期模式在上行链路上使用指派的分组格式进行发射或者利用这些资源在下行链路上进行接收。
在图4B中,利用PDCCH发送第一VoIP分组501从而提供持久分配资源以及调制和编码方案。然后可以发送第二(新)VoIP分组502和后续(新)VoIP分组503、504而无需显式PDCCH信令。在图4B中也图示了HARQ ACK和NACK响应以及示例重传(505)。使用L1/L2控制信令(在PDCCH中)来发送下行链路中的重传。持久调度因此仅需应用于初始传输。
已经设想可以在L1/L2控制信令中(在PDCCH中)针对上行链路和下行链路均用一位信令显式通知新数据指示符(“NDI”)标志,该NDI标志向接收器告知传输的新/重复性质。根据这一点,例如响应于ACK信号,针对各新传输(即不针对重复传输)在相继传送块之间切换或者改变NDI标志。例如随着两次重传,NDI标志保持不变为1或者0,然后针对各新传输,改变标志从而如图4A中所示,用于四次新传输的NDI标志将在它们的对应PDCCH中为序列[1,0,1,0]。这指示NDI标志针对新数据的各传输将从0改变成1或者从1改变成0。然而对于重传,NDI标志将保持与用于相同数据分组的初始(或者先前)传输的值相同的值。NDI值的改变因此意味着分组是新的。冲刷对应数据缓冲器(如HARQ缓冲器),并且接收的信息未与HARQ缓冲器中的旧信息组合。
对于半持久调度,针对初始传输未发送PDCCH数据,因此NDI标志的值未知、即未用信令显式通知它,因此用于在重传中使用的NDI值未知。需要知道用于初始传输的NDI标志的值以正确接收和组合对应HARQ重传。
一个知道NDI标志的值的解决方案在于针对各传输、针对半持久分配资源和动态分配资源二者以及针对各半持久传输可能性(即,即使实际上未使用半持久分配发送数据)切换NDI标志。用户设备将尝试对新数据传输进行解码并且因而假设NDI标志的已改变值。
注意在PDCCH上发送NDI标志,因此在图4A中利用下行链路分配来发送它。无需进一步PDCCH资源分配的传输是半持久分配,并且对于这些分配,未用信令显式通知NDI标志。然而图5图示了如下半持久分配,针对这些分配,用户设备隐式假设NDI标志值(如图5中的括号中所示NDI值)。这当在收发器处组合重传时是需要的,因为相同NDI标志值指示组合数据与不完整或者不正确接收的先前数据,而不同NDI标志值指示冲刷HARQ缓冲器而不组合接收的数据与HARQ缓冲器中的旧数据。利用PDCCH资源来发送下行链路中的重传,因此这些重传也与显式NDI标志一起发送。这具有的弊端在于用户设备和基站在持久资源被释放时具有对NDI标志值的相同理解。这可能难以实现,尤其是如果在隐式释放未用持久分配之前的某一数目的持久(“N_PS”)分配之后采用隐式释放。对于半持久调度,针对初始传输未发送PDCCH数据,因此NDI标志值未知(即在重传中使用哪个NDI标志值)。需要知道用于初始传输的NDI标志的值以正确接收和组合对应的HARQ重传。因此,即使仅针对实际传输的分组而改变NDI标识值仍然存在相同问题。
现在进一步详细地描述用于为半持久分配的传输资源限定NDI标志值的示例实施例。在第一实施例中,即使实际上未使用半持久分配来发送数据,仍然针对每次新传输(针对持久和动态分配资源)(即也针对各半持久传输可能性)切换如上文介绍的NDI标志。这包括在未发送新数据时、但是其中用户设备预计半持久传输的情况。用户设备将尝试对传输进行解码并且假设NDI的已改变值。因此在第一实施例中,用户设备和基站都在有半持久指派或者动态分配的资源时改变NDI状态,无论是否有使用这些资源的实际传输。对于重传,NDI标志值包括在PDCCH中。
现在参照图5,图示了根据本发明原理的在半持久资源分配的情况下交替的新数据指示符标志的值的一个实施例的图解。下行链路分配表示给出下行链路分配的在PDCCH上传输的下行链路控制信息(“DCI”)。半持久(“SP”)下行链路分配表示给出用于半持久使用的下行链路分配的在PDCCH上传输的下行链路控制信息,该信息可以包括将在无进一步PDCCH输入时定期使用的时间、频率以及调制和编码方案。
注意在PDCCH上发送NDI标志,因此在图5中利用动态下行链路分配和利用半持久下行链路分配来发送它。使用半持久资源来进行无PDCCH数据的传输(包括利用半持久分配的下行链路资源的传输)。未用信令显式通知用于这些传输的分配,因此也不能用信令通知NDI标志。然而图5针对半持久资源示出了用户设备假设NDI值(隐式)(在括号内的NDI标志)。这是在组合重传时、特别是在接收NACK之后需要的。未改变的NDI标志组合HARQ缓冲器中的数据,而不同NDI标志冲刷HARQ缓冲器,因为已经接收新数据。下行链路中的重传在PDCCH上被发送并且也包括显式NDI标志。
在这一实施例中,用户设备和基站优选地在半持久资源被释放时具有相同NDI标志理解。应当仔细执行这样的过程,尤其是如果在N_PS次未用持久分配之后采取隐式释放。即使仅针对实际传输的分组改变NDI标志仍然需要仔细执行。
根据另一实施例,如图6中所示,根据本发明的原理,新数据指示符标志的值针对半持久资源分配是固定的。例如,NDI标志的值固定于NDI=0或者NDI=1。在这一实施例中,用户设备知道针对利用半持久分配资源的传输假设哪个NDI值。无论何时接收或者认为已经接收半持久分配,数据缓冲器(如软HARQ缓冲器)优选地对旧数据进行冲刷。换而言之,软HARQ缓冲器的冲刷不是基于NDI标志而代之以基于持久分配的知识(使用持久分配仅发送新传输)。
在PDCCH上发送NDI标志,因此如图6中所示利用动态和半持久下行链路分配来传输NDI标志。包括半持久分配的下行链路资源的无PDCCH数据的传输是半持久分配,并且对于这些分配未用信令通知NDI标志。然而图6图示了用户设备隐式假设NDI标志(在括号内的NDI)。这是在组合重传时需要的,其中未改变的NDI标志指示组合重传数据,而不同NDI标志告知用户设备冲刷HARQ缓冲器。
在这一第二实施例中,在系统设计中优选地仔细对待用于相同HARQ过程的动态和半持久分配的组合。在一个实施例中,针对半持久调度保留一些HARQ过程,因此这些过程未与动态资源调度一起使用。在另一实施例中允许一些动态调度(例如当不考虑利用动态分配的半持久分配时)。该动态分配然后自然可以使用NDI=1。如果动态分配是半持久分配的传输的重传,则自然可以使用NDI=0。因此,一种简单方式可以用来基于改变的NDI区分新传输与重传。
因此,一种用于这一第二实施例的针对利用半持久资源分配的NDI的规则是例如设置NDI=0(无PDCCH)并且利用动态分配(具有PDCCH)正常切换NDI标志。当在PDCCH上接收用于新传输的动态分配时,缓冲器冲刷可以正常地基于改变的NDI值进行操作。当未发送PDCCH数据(对于半持久分配)时,用户设备知道其是新传输并且可以冲刷缓冲器。
现在参照图7,图示了上行链路数据传输的一个实施例的图,其中根据本发明的原理针对新数据指示符标志假设固定值。对于上行链路数据传输,在PDCCH上的下行链路中发送对应的上行链路资源授权。在通话突发开始时,基站在PDCCH上发送持久分配(资源授权)(701)。用户设备存储相关参数(时间-频率资源、调制和编码方案)并且使用该分配来发送上行链路分组(707)。可以使用存储的持久分配来发送下一上行链路分组(708)而不在PDCCH上接收动态上行链路分配(假设NDI=0)。这对于下一分组同样成立(709)。如果未正确接收该分组,则基站请求重传。通过使用与用于初始传输的NDI值相同的NDI值来指示重传。这里针对所有持久分配的传输假设NDI=0。用户设备重传分组(710)并且基站组合分组与先前传输。通过在PDCCH上经由上行链路发送资源授权来动态分配下一传输(703)。现在正常切换NDI标志以指示新传输(因此现在NDI=1)。由于未正确接收上行链路分组(711),所以基站请求重传(由NDI=1表示)(即与用于初始/先前发送的值相同的值),并且用户设备重传该分组(712)。再次通过在PDCCH上经由上行链路发送资源授权来动态分配下一传输,并且再次切换NDI(NDI=0)以指示新传输。在PDCCH上发送的下一分配(706)是持久分配。由于持久分配总是新传输,所以无需NDI标志来指示新传输。因此,NDI标志可以取任何值。这里假设NDI=0。
已经介绍用于指示在PDCCH上发送的分配是持久分配(并且应当被存储)的若干已知方式。一种方式为一个用户设备分配两个用户设备标识(例如小区无线电网络临时标识符(“C-RNTI”)):一个用于动态分配而一个用于持久分配(待存储)。通过利用用户设备标识(C-RNTI)对PDCCH循环冗余校验(“CRC”)进行掩码而在PDCCH上发送用户设备标识。当用户设备接收PDCCH数据时,对其进行解码并且计算循环冗余校验而且利用其自己的用户设备标识对循环冗余校验进行掩码、然后比较循环冗余校验与接收的循环冗余校验。如果它们匹配,则用户设备知道该传输针对它。如果不匹配,则已经出现传输错误或者该传输是针对另一用户设备(具有不同用户设备标识)而发送的。因此,如果为用户设备分配两个用户设备标识,则用户设备在对PDCCH数据进行解码之后尝试利用两个用户设备标识对其进行掩码,并且如果其中之一匹配,则用户设备知道PDCCH用于它,然后基于哪个用户设备标识匹配,用户设备知道该分配是动态(一次性)分配还是持久分配(待存储)。
如果另一用户设备标识(C-RNTI)用来指示持久分配(将其称为“C-RNTI_P”),则有两个替代操作模式。首先,当在PDCCH上发送待存储的参数时仅在数据(通话)突发开始时使用C-RNTI_P(即仅针对持久初始传输),或者其次,针对重传也使用C-RNTI_P。在这两种情况下不同地处置NDI标志。
首先考虑C-RNTI_P仅在通话突发开始时用于持久初始传输的情况。在这一情况下,C-RNTI_P简单地指示这一分配是持久分配并且应当存储相关参数。由于利用新传输来发送该分配,所以无需NDI标志来指示该传输是新传输还是重传,因为C-RNTI_P已经指示其是新传输。因此,NDI标志可以取任何值。这里,NDI标志可以具有固定值(例如NDI=0)。然后可以减少假警报率。假警报在这里表示用于某一其它用户的PDCCH数据或者仅指“正确”解码的由用户设备接收的随机噪声(即CRC+UE标识掩码匹配),因为可以放弃接收NDI=1的所有情况。这里,可以根据先前实施例将NDI标志用于后续传输(无PDCCH的重传或者新传输)(例如,使用NDI的固定值,比如NDI=0)。概括而言,对于初始持久分配(在通话/数据突发开始时发送),另一用户设备标识(C-RNTI_P)(或者任何其它已知或者先前未知的方法)指示该分配是新持久分配,并且应当存储相关参数。可以固定NDI标志以减少假警报率。重传与正常用户设备标识一起发送,并且NDI标志正常用来指示传输是否应当与先前传输组合,因为未改变的NDI标志指示重传(组合数据),而不同的NDI标志指示新传输(冲刷接收器中的缓冲器,即未组合数据)。在没有PDCCH数据的情况下进行新持久传输,并且假设NDI=0。
另一替代方式也将C-RNTI_P用于使用持久分配的资源来重传新传输(未用PDCCH发送)。在这一情况下,C-RNTI_P指示这一PDCCH涉及持久调度,但是仅C-RNTI_P并不指示PDCCH用于新传输(并且应当存储相关参数)还是用于重传。这里可以使用NDI标志,但是方式与前述方式不同。由于使用持久分配的传输(无PDCCH)总是新传输,所以无需NDI标志切换以指示何处开始新传输。NDI标志可以代之以用于指示具有C-RNTI_P的PDCCH传输是持久初始传输(具有应当存储的参数,比如NDI=0)还是重传(例如NDI=1)。在这一情况下,NDI标志也可以识别为例如重传指示符标志。
备选地,在另一用户设备标识用来指示持久分配的上述情况下,可以使用不同的数据加扰而不是第二用户设备标识。然后,在计算循环冗余校验之前利用已知序列对PDCCH数据的信息部分进行加扰,并且用户设备在其检验循环冗余校验之前首先对PDCCH数据进行解码并且对信息部分进行解扰。因此,如果循环冗余校验在未解扰时匹配,则PDCCH数据是正常PDCCH,而如果循环冗余校验在解扰时匹配,则PDCCH数据针对持久分配。NDI操作与上述NDI操作相同。
当动态调度改写半持久调度的初始传输时,如果发送新传输则通常将从用于相同HARQ过程的先前值切换NDI标志的值。如果发送重传而不是半持久初始传输,则NDI标志的值与用于先前传输的值相同,因此用户设备应当组合该传输与HARQ缓冲器中的信息。
现在参照图8A和图8B,分别图示了用于基于竞争和非基于竞争的随机接入过程的数据传输的实施例的图解,其中根据本发明的原理针对新数据指示符标志假设值。如图8A中所示,随机接入信道(“RACH”)过程(例如参见通过引用结合于此的3GPP TS 36.300,“3rd Generation Partnership Project;Technical Specification GroupRadio Access Network;Evolved Universal Terrestrial Radio Access(E-UTRA)and Evolved Universal Terrestrial Radio Access Network(E-UTRAN);Overall description;Stage 2(Release 8),”V8.4.0(2008年3月))中,消息810提供从用户设备(表示为“UE”)向基站(表示为“eNB”)的随机接入前导。消息820包含消息830的上行链路分配的紧凑格式(在基于竞争的RACH中)并且在非基于竞争的RACH中可能也包含用于在消息820之后的第一上行链路分配的紧凑格式。这一紧凑格式无需具有NDI标志,并且其可以是如上文所述用于半持久分配的固定值。消息840向用户设备提供竞争解决。
如图8B中所示,消息800提供从基站向用户设备的随机接入前导指派。消息810、820在其它方面类似于上述消息810、820。因此,在随机接入信道消息830或者可能第一上行链路传输的情况下,可以在物理下行链路共享信道(PDSCH)上发送的RACH消息820中完成分配,并且该分配以紧凑方式为上行链路共享信道(“PUSCH”)上的传输提供上行链路分配。这意味着在没有正常PDCCH的情况下完成了这一分配,并且该分配不必包括NDI标志。同样,如果可以保证将不存在用于用户设备的若干同时分配,则NDI标志的固定值也可以用于在RACH消息820内完成的分配或者无PDCCH的分配。由于可以假设在RACH消息829中将仅有一个分配,所以可以运用固定NDI标志。
在第三实施例中,针对半持久资源分配根据系统帧号(“SFN”)或者传输时间间隔/子帧号来导出NDI标志值。这具有的优点在于用户设备和基站都知道待使用的NDI标志的值,这基本上消除错误情况。经由无线电资源控制信令向各用户设备单独地通知保留的HARQ过程的数目和关联周期。下文列出了实施这些规则的若干可能性和一些例子。对于各所示情况,基于HARQ过程来导出NDI标志值。
对于下行链路,针对各HARQ过程导出NDI标志值如下。NDI=[floor(当前TTI/(PS_period*Number_of_semi-persistent_HARQ))]mod 2,其中当前TTI=10*SFN+子帧号,子帧号=0、1、2、...、9。PS_period表示经由无线电资源控制用信令通知的半持久调度周期。TTI表示“传输时间间隔”,其通常为1ms。运算“mod 2”将NDI标志的值约束为0或者1。
对于上行链路,用于HARQ的HARQ过程的数目未经由无线电资源控制用信令通知,而是根据下文称为HARQ过程数目的同步HARQ周期中的HARQ过程的数目(例如八个HARQ过程)而导出。针对将用于半持久分配的各HARQ过程导出NDI标志值如下。NDI=[floor(当前TTI/(PS_period*Number_of_semi-persistent_HARQ-s))]mod 2,其中当前TTI=10*SFN+子帧号,并且其中子帧号=0、1、2、...、9。PS_period表示经由无线电资源控制用信令通知的半持久调度周期。Number_of_semi-persistent_HARQ-s=min{N},其中N*PS_period/HARQ过程数目=整数。也可以根据图6表示第三实施例的原理,其中如上文所述根据系统帧号等导出NDI标志而不是将NDI例如固定于0。
因此已经介绍一种用于为利用半持久资源分配的基站和用户设备用信令通知/确定新数据指示符(“NDI”)标志的值的装置、系统、计算机程序和有关方法。在一个实施例中,基站的收发器在物理下行链路控制信道(“PDCCH”)上提供NDI标志的初始值。NDI标志可以在后续数据传输期间遵循已知序列而在PDCCH上无进一步资源信令。例如假定NDI标志由基站的处理器切换以便进行用于持久和动态分配的资源的后续数据传输,即使实际上未在持久分配的资源上发送数据。在另一实施例中假定NDI标志为固定值以便进行用于持久分配资源的后续数据传输。基站的收发器的重传与PDCCH数据一起发送,并且包括用于NDI标志的显式值。在一个实施例中,在PDCCH上的下行链路控制信息中用信令通知NDI标志。在另一实施方式中,在PDCCH上用信令通知时间和频率资源以及调制和编码方案(“MCS”)。在又一实施例中,在否定确认信号的传输之后,由用户设备/基站的处理器将重传数据与先前传输数据组合。在又一实施例中,数据缓冲器(比如用户设备/基站的存储器中的软HARQ缓冲器)在确认信号的传输之后对旧数据进行冲刷。在又一实施例中,当在持久分配的资源上接收新数据时或者在其之前,软HARQ缓冲器对旧数据进行冲刷。在又一实施例中,基站的处理器使用与半持久资源分配相反的PDCCH随着动态资源分配而切换NDI标志。在一个实施例中,NDI标志控制混合自动重传请求过程在用户设备的处理器中的软组合。
在另一实施例中,使用系统帧号、子帧号、半持久调度周期和经由无线电资源控制用信令通知的为持久调度保留的HARQ过程的数目,在用户设备/基站的处理器中导出用于下行链路的NDI标志的值。在另一实施方式中,使用同步HARQ周期中的HARQ过程的数目、子帧号以及经由无线电资源控制用信令通知的半持久调度周期,在用户设备/基站的处理器中导出用于上行链路的NDI标志的值。
在另一实施例中,针对所有持久新传输(未用PDCCH发送)假定NDI值为固定值。在又一实施例中,与用于初始传输的NDI值相同的NDI值用于重传。在又一实施例中,基站/用户设备的处理器根据关联HARQ过程中的先前NDI值来切换用于动态分配的新传输的NDI值。该传输可以是半持久或者动态的。
另外,虽然已经详细地描述本发明及其优点,但是应当理解这里可以进行各种改变、替换和变更而不脱离本发明的精神实质和范围。例如,上文讨论的许多过程可以用不同方法来实施并且替换为其它过程或者其组合,以如这里描述的在无线通信系统中针对半持久分配的传输资源确定NDI标志的值。
如上文所述,示例实施例提供一种方法和由提供用于执行该方法的步骤的功能的各种模块构成的对应装置。模块可以实施为硬件(包括集成电路,比如专用集成电路),或者可以实施为用于由计算机处理器执行的软件或者固件。具体而言,在固件或者软件的情况下,可以将示例实施例提供为一种包括计算机可读存储结构的计算机程序产品,该存储结构在其上实施用于由计算机处理器执行的计算机程序代码(即软件或者固件)。
另外,本申请的范围并不限于说明书中描述的过程、机器、产品、物质组成、装置、方法和步骤的具体实施例。如本领域普通技术人员根据本发明的公开内容将容易理解的那样,根据本发明可以利用与这里描述的对应实施例执行基本上相同功能或者实现基本上相同结果的当前存在或者以后将开发的过程、机器、产品、物质组成、装置、方法或者步骤。
Claims (8)
1.一种用于通信的装置,包括:
用于接收指示半持久调度的小区无线电网络临时标识符或指示非半持久调度的另一小区无线电网络临时标识符的装置;
用于根据所述半持久调度将对具有新数据指示符标志的数据的接收视为以下各项之一的装置:
如果所述新数据指示符标志的值等于第一预定义值,则为半持久初始传输,以及
如果所述新数据指示符标志的所述值等于第二预定义值,则为半持久调度数据的重传;
用于在所述新数据指示符标志等于所述第一预定义值时存储与所述半持久调度关联的参数的装置;以及
用于根据所述非半持久调度将对具有另一新数据指示符标志的数据的另一接收视为以下各项之一的装置:
如果所述另一新数据指示符标志的值不同于先前接收的新数据指示符标志的值,则为新数据,以及
如果所述另一新数据指示符标志的所述值等于所述先前接收的新数据指示符标志的所述值,则为重传数据。
2.根据权利要求1所述的装置,其中所述第一预定义值为0,而所述第二预定义值为1。
3.根据权利要求1所述的装置,还包括
数据缓冲器,具有存储于其中的数据;以及
用于通知所述数据缓冲器进行以下操作的装置:
如果所述新数据指示符标志的所述值等于所述第一预定义值,则冲刷所述数据缓冲器中存储的数据,以及
如果所述新数据指示符标志的所述值等于所述第二预定义值,则组合所述存储的数据与所述半持久调度数据的重传。
4.根据权利要求1-3中任一项所述的装置,其中在物理下行链路控制信道中提供所述新数据指示符标志。
5.一种用于通信的方法,包括:
接收指示半持久调度的小区无线电网络临时标识符或指示非半持久调度的另一小区无线电网络临时标识符;
根据所述半持久调度将对具有新数据指示符标志的数据的接收视为以下各项之一:
如果所述新数据指示符标志的值等于第一预定义值,则为半持久初始传输,以及
如果所述新数据指示符标志的所述值等于第二预定义值,则为半持久调度数据的重传;
在所述新数据指示符标志等于所述第一预定义值时存储与所述半持久调度关联的参数;或者
根据所述非半持久调度将对具有另一新数据指示符标志的数据的另一接收视为以下各项之一:
如果所述另一新数据指示符标志的值不同于先前接收的新数据指示符标志的值,则为新数据,以及
如果所述另一新数据指示符标志的所述值等于所述先前接收的新数据指示符标志的所述值,则为重传数据。
6.一种用于通信的装置,包括:
用于提供指示半持久调度的小区无线电网络临时标识符或指示非半持久调度的另一小区无线电网络临时标识符的装置;
用于导出具有以下值之一的新数据指示符标志的装置:
用于根据所述半持久调度的半持久初始数据传输的第一预定义值,以及
用于根据所述半持久调度的半持久调度数据重传的第二预定义值;
用于在所述新数据指示符标志等于所述第一预定义值时存储与所述半持久调度关联的参数的装置;以及
用于导出具有以下值之一的另一新数据指示符标志的装置:
与用于根据所述非半持久调度的新数据的先前传输的新数据指示符标志的值不同的值,以及
与用于根据所述非半持久调度的重传数据的所述先前传输的新数据指示符标志的所述值相等的值。
7.根据权利要求6所述的装置,其中与所述半持久调度关联的参数包括用于将向用户设备传输的数据的以下各项中的至少一项:
时间和频率分配;以及
调制和编码方案。
8.一种用于通信的方法,包括:
提供指示半持久调度的小区无线电网络临时标识符或指示非半持久调度的另一小区无线电网络临时标识符;
导出具有以下值之一的新数据指示符标志:
用于根据所述半持久调度的半持久初始数据传输的第一预定义值,以及
用于根据所述半持久调度的半持久调度数据重传的第二预定义值;
在所述新数据指示符标志等于所述第一预定义值时提供与所述半持久调度关联的参数;或者
导出具有以下值之一的另一新数据指示符标志:
与用于根据所述非半持久调度的新数据的先前传输的新数据指示符标志的值不同的值,以及
与用于根据所述非半持久调度的重传数据的所述先前传输的新数据指示符标志的所述值相等的值。
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CN102067500A (zh) | 2011-05-18 |
JP2011517886A (ja) | 2011-06-16 |
EP2255484A2 (en) | 2010-12-01 |
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US20110182245A1 (en) | 2011-07-28 |
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US9281922B2 (en) | 2016-03-08 |
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