CN2620947Y - 实行以频道品质条件为基础的认识流控制的使用者设备 - Google Patents
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Abstract
一种B节点,其聪明地控制在该无线网络控制器(RNC)及在该B节点间的数据流。该B节点监测某些准则,且若必须时,适当地增加或减少在该RNC及在该B节点间的数据流。此藉由最少化在该B节点缓冲的数据量来改进数据流。
Description
(1)技术领域
本实用新型有关无线通讯的领域,更特定地说,本实用新型有关在第三代(3G)通讯系统中于无线网络控制器(RNC)及B节点间数据传输流控制的运用。
(2)背景技术
一种3G通用地面无线存取网络(UTRAN)包括许多RNCs,每一个伴随着一或更多B节点且每一个B节点进一步伴随着提供一或更多信元。
该3G频分双工(FDD)及时分双工(TDD)模式一般使用该RNC以分布(亦即,缓冲及调度)至至少一个使用者设备(UE)的数据传输。然而,对3G蜂窝系统的高速频道,数据被调度以进行该B节点的传输。例如,这些高速信道的一个为高速下行分享频道(HS-DSCH)。因数据系由该B节点调度,必须在该B节点缓冲数据以传输至该UE(s),。
有许多大量在该B节点缓冲的数据对系统的整体操纵有负面影响的案例,一些这些案例叙述于后。
第一个案例是关于在3G系统的重新传输机构以达到端点对端点数据传输的高可信度。熟知本技术的人员应了解在该B节点及该UE间的传输失败可能因许多不同的原因。例如,该B节点已再尝试传输数次而未成功,或者,用于特定传输的传输时间已失效。更详细叙述于后的本实用新型意欲涵盖这些情况及数据传输失败促使无线连结控制器(RLC)重新传输的任何其它情况。
重新传输机构有许多层次。如一个机构为高速下行分组接入(HSDPA)的混合自动重发请求(H-ARQ)方法。该H-ARQ方法提供一种机构,于此错误接收的传输被指示给该传送器,且该传送器重新传输该数据直到该数据被正确接收。
除该H-ARQ方法外,在该RNC及该UE有实体。该传送RLC实体在特定通讯协议数据单位(PDU)的集管发出序号(SN),其被接收RLC实体使用以确保没有任何PDUs在该传输失联,若在传输期间有PDUs失联(由PDUs的失序传送而知悉),则该接收RLC实体传送一个状态报告PDU以通知该传送RLC实体某些PDUs为失联的,该状态报告PDU叙述成功及/或不成功数据传输的状态,其辨识已失联或已接收PDUs的序号。若PDUs为失联的,则该传送RLC实体会重新传输该已失联PDU的副本至该接收RLC实体。
重新传输对系统性能的影响参考图1被叙述。如所示,当具有SN=3的该PDU未被该UE成功接收,在该UE内的该RLC要求在该RNC的其对等实体重新传输。同时,具有SNs=6及7的PDUs在该B节点的缓冲器排列。
参考图2,因重新传输方法需要一些时间且数据持续被传输,多两个具有SNs=8及9的PDUs已在具有SNs=6及7的PDUs之后排列且在具SN=3的已重新传输PDU前。具SN=3的该PDU必须等待直到具SNs=6-9的PDUs被传输至该UE。此外,因至较高层的数据依序传送的要求,具有SNs=4-9的PDUs不会通过较高层直到具有SN=3的该PDU被接收且数据的依序传送可被进行。
该UE被要求缓冲该失序数据直到施联的PDU可被传送。此不仅造成传输的延迟,亦需要该UE具有足够的内存能够进行持续数据接收的数据缓冲直到已失联数据可被成功重新传输。否则,有效的数据传输速度被降低,因而影响服务品质。因内存为非常昂贵的,此为不欲的设计限制。因此,此第一个案例为当需要RLC重新传输且大幅地在该B节点缓冲的数据造成大量的数据传输延迟及高UE内存要求。
第二个案例为当在该B节点数据的缓冲负面地影响系统性能为层2(L2)或层3(L3)信号及数据传输由相同调度方法进行或分享在该B节点的单一缓冲器的情况。虽然数据被缓冲及进行且L2/3信号在其后,但信号无法绕过传输排列。在传输缓冲器内的数据量愈大(其以先入先出(FIFO)缓冲器操作),L2/3信号或数据通过该缓冲器的时间愈长。任何高优先级的L2/3信号因在该缓冲器的数据而被延迟。
第三个案例当在该B节点数据的缓冲负面地影响系统性能是因服务高速下行分享频道(HS-DSCH)信元变化的情况。因该B节点执行HS-DSCH数据的调度及缓冲,当该UE执行服务HS-DSCH信元变化自来源B节点至目标B节点,有一种可能为在接管后相当量的数据仍在来源B节点被缓冲,此数据为不能回复的因当自来源B节点要被传输至目标B节点在UTRAN结构内没有数据缓冲的机构。当服务HS-DSCH信元变化时,该RNC没有任何关于多少数据遗失的信息,因该RNC不知何种数据在该来源B节点被缓冲。在HS-DSCH信元变化的情况,在该来源B节点被缓冲的数据量愈大,最终被滞留在该来源B节点且必须被重新传输的数据量愈大。
因此,对上述原因希望限制在该B节点缓冲的数据量。
(3)实用新型内容
本实用新型为一种B节点,其聪明地控制在该RNC及在该B节点间的数据流。该B节点监测某些准则且若必须时适当地增加或减少在该RNC及在该B节点间的数据流。此藉由允许重新传输的数据、发出信号步骤及其它要以较现有技术系统为快的速度成功接收的数据,藉由减少在该B节点缓冲的数据量来改进传输系统性能。当频道品质降级时,数据流控制被运用以减少在该B节点的缓冲且在HS-DSCH接管前。
在较佳具体实施例中,该RNC发出信号给该B节点,且要求该RNC送出一定量的数据至该B节点。该B节点监测经选择的品质指示器及基于该经选择的品质指示器计算缓冲器的容量分布。该B节点将容量分布信号送至该RNC。为响应该容量分布的接收,该RNC以根据该容量分布所决定的数据流速率传送数据至该B节点。
(4)附图说明
本实用新型详细了解可由下列叙述、实例及相关附图而了解,其中:
图1显示在该RNC、该B节点、及该UE的数据的现有技术缓冲。
图2显示在重新传输情况下,在该RNC、该B节点、及该UE的数据的现有技术缓冲。
图3A及3B共同为根据本实用新型方法监测频道品质及调整在该RNC及在该B节点间的数据流。
图4为使用图3A及3B的方法,在重新传输情况下,在该RNC、该B节点、及该UE的数据的缓冲。
图5为根据本实用新型所制造的该B节点的方块设计。
(5)具体实施方式
本实用新型是参考附图叙述的,其中相同数字表示相同组件。虽然本实用新型以参考排列于缓冲器特定数目的PDUs(如数十PDUs)而被叙述,此PDUs数目仅为简化,根据先前案例被传输及缓冲的PDUs实际数目还可能在数百PDUs或更多。本实用新型及其意旨意欲适用于任何数目的PDUs及任何尺寸传输缓冲器。
一般,当该UE的频道品质降级时,本实用新型为UE减少至该B节点的数据流,且该UE的频道品质改进时,增加至该B节点的数据流。为控制在该RNC及在该B节点间的数据传输流,本实用新型监测一或更多频道品质的参数,此数据流控制可基于一个准则或是许多不同准则的组合。此外,如于下文更详细说明,该准则可由该B节点内部产生,或是可由外部实体产生(如该UE),并传送至该B节点。
参考图3A,根据本实用新型监测通讯频道品质及调整在该RNC 52及在该B节点54间的数据流的方法50被示出。此方法50处理在该RNC 52及在该B节点54间的数据传输,该RNC 52传送一容量要求至该B节点54(步骤58)。基本上该容量要求为自该RNC 52至该B节点54的要求使该RNC 52送出一定量的数据至该B节点,该B节点54接收此容量要求及监测经选择的品质指示器(步骤60)。此经选择的品质指示器可基于自该UE传送的数据(于后文详细说明),或是可基于内部产生的品质指示器,如在该B节点54缓冲器的深度。
该B节点54亦监测在该B节点54内缓冲器的状态(步骤62)。如可由熟知本技术的人员了解,虽然本实用新型以参考在该B节点54内的单一缓冲器叙述以简化,大部份该缓冲器包括许多缓冲器或是被分成许多子缓冲器的单一缓冲器,每一个缓冲器或子缓冲器被分配有一或更多数据流。无论是否有一或多个多重缓冲器,一种显示在缓冲器内数据量的指示器在该B节点内内部产生。此使得该B节点54监测在缓冲器内的数据量,及亦可监测该缓冲器可接受的额外数据量。
该B节点54计算并传送一种容量分布(步骤64)至该RNC 52,该容量分布由该B节点54辨识以允许该RNC 52送出一定量的数据。在接收该容量分布时,该RNC 52根据该分布传输数据(步骤66),亦即,该RNC 52传输数据至该B节点54,其量不超过该容量分布。而后该B节点据以调整其缓冲器以容纳及储存该数据(步骤69)。储存于该缓冲器的数据量会依据由该RNC52传输的进入数据及传输至该UE 82(示于图3B)的送出数据来变化。
熟知本技术的人员会欣喜的是当数据流由该RNC 52至该B节点54,及当该流速连续由该B节点54调整时,示于图3A的方法50可固定重复。亦应注意方法步骤58、60、62、64、66及69不必要依序执行,且在方法50的不同步骤被施用前任何一个步骤可被施用多次。此外,一些步骤,如容量分布步骤64,可显示重复的数据分布使得数据传输(步骤66)可被定期地进行。
参考图3B,根据本实用新型监测该B节点54及该UE 82间的通讯频道品质的方法80被示出。该B节点54传送数据至该UE 82(步骤84)。该UE 82接收此数据及传输一信号品质指示器(步骤86),例如频道品质指数(CQI)至该B节点54。此信号品质指示器再被用做图3A步骤60中的经选择品质指示器。
可由熟知本技术的人员注意的是方法步骤84及86不必要依序执行,例如,在FDD模式,无论是否数据被传输,信号品质指示器为定期自该UE 82传送,在此情况下,该UE 82可定期或响应特定事件传输一信号品质指示器至该B节点54,该信号品质指示器再被用做图3A步骤60中的经选择品质指示器。
如上所述,该经选择品质指示器可由该B节点内部地产生,或者由另一实体(如该UE)外部地产生并送至该B节点。根据第一具体实施例,准则为自该UE的频道品质反馈。在此具体实施例,下行频道品质的指示器CQI被使用。
在第二具体实施例,准则为该UE根据该H-ARQ方法产生的ACK或NACK。例如,在一段时间,ACKs的数目及/或NACKs的数目可被用来得到频道品质的指示器。
在第三具体实施例,准则为该B节点选择的调变及编码组(MCS),其是需要的以成功传输数据。如可由熟知本技术的人员所了解当频道条件为差时,非常强烈的MCS被使用。或者,当频道条件为良好时,较不强烈的MCS被使用且大量数据被传输。最强烈的MCS组的选择可被使用作为差的频道品质条件的指示器,但最不强烈的MCS被使用象征频道品质条件为佳的。
在第四具体实施例,准则为在该B节点传输缓冲器内的行的深度。例如,若该B节点54缓冲器目前储存大量数据,频道品质条件的指示器可能是差的,因该数据在该B节点传输缓冲器被″向后移动″。些微负载的缓冲器可能频道品质条件为良好的指示器且数据未向后移动。
在第五具体实施例,准则为″落″在该B节点的数据量。如可由熟知本技术的人员所了解掉落的数据为该B节点企图重新传输数次的数据且在预先决定数目的尝试后已被放弃,若大量的传输由该B节点掉落,此为频道品质条件为差的指示器。
在第六具体实施例,准则为在预先决定时间(例如一百毫秒)内可由该B节点传输的数据量。依通讯频道的品质而定,在该B节点缓冲的PDUs数目可变化。虽然预先决定的时间可被固定,因改变频道品质条件,在预先决定时间内可被传输的PDUs量可显著改变。例如,若频道品质条件为佳的,一百个PDUs可在一百毫秒的时间内被传输;然而,若频道品质条件非常差,仅十个PDUs可在一百毫秒的时间内被传输。
熟知本技术的人员应了解可直接或间接显示频道条件的其它准则可用于本实用新型。此外,依系统使用者的特定需求,二或更多上述准则组合的使用可据此被利用或权重。
参考图4,适当控制在该RNC及在该B节点间的数据流的益处可被看出。该实例为因失败传输而需要重新传输且在该RNC及在该B节点间的数据流被减少的案例。数据流减少的结果为仅一个额外具SN=8的PDU在具SN=3的已重新传输PDU之前。如图4所示,与现有技术处理图2(具有SNs=8及9的PDUs在具有SN=3的已重新传输PDU之前)所示相较,数据流控制的运用减少具有SN=3的PDU的重新传输的延迟,因此,具有SN=3的PDU可被早点重新传输至该UE。该定序传送要求产生更快的处理及PDUs 4至8至较高层的传送。
图5为无线通讯装置的方块图,如先前提供的进行本实用新型的B节点130。该B节点130包括天线134(包括RF升频器及降频器)、收发器132(包括接收器及传送器部份)、缓冲器133及信号处理器135。虽然该缓冲器133以单一缓冲器表示以简化,大部份该缓冲器133包括许多缓冲器或是被分成许多子缓冲器的单一缓冲器,每一个缓冲器或子缓冲器被分配有一或更多数据流。此外,在其实施实施中,可预期不同的功能可根据程序指示藉由一或更多共同电路执行,如微处理器电路。
该收发器132为该B节点130与该RNC 131及该UE 137间的通讯接口。该收发器132经由天线134与该UE 137无线地通讯,该收发器132亦经由有线接口138与该RNC 131通讯。由该收发器132接收的信息被向前送至该信号处理器135,其与该缓冲器133交界。同样地,自该信号处理器135送出的信号由该收发器132依需求向前送至该RNC 131或该UE 137。该缓冲器133储存由该RNC 131送至该B节点130的信息以传输至该UE 137,或是由该UE 137送至该B节点130的信息以传输至该RNC 131。
当该RNC 131经由该有线接口138传输该容量要求至该B节点130,该收发器132将其向前送至该信号处理器135。该信号处理器135监测该缓冲器133的状态及所选择品质指示器的状态,该信号处理器135经由该收发器132及该有线接口138传送容量分布至该RNC 131。该RNC 131再根据该容量分布传输该数据至该B节点130。在经由该天线134及无线接口传输至该UE 137前,该B节点储存数据于缓冲器。
仅管本实用新型已以较佳具有体实施例叙述,但在权利要求所限定的本实用新型范围内的其它变化是为熟知本技术的人员所明显易见的。
Claims (3)
1.一种B节点,其与一种无线网络控制器通讯,该无线网络控制器发出信号给该B节点,且要求该无线网络控制器送出一定量的数据至该B节点;其特征在于,该B节点包括:
一收发器以接收及传输数据至该无线网络控制器;
一传输缓冲器以储存该数据;及
一信号处理器以监测该传输缓冲器的状态及计算容量分布,该容量分布依所选择品质指示器而定;由此,该信号处理器为响应该要求的接收传输一容量分布以使无线网络控制器传输数据。
2.根据权利要求1所述的B节点,其特征在于,该处理器决定该所选择的品质指示器。
3.根据权利要求2所述的B节点,其特征在于,所选择的品质指示器为该传输缓冲器的状态。
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