CN1653342A - 以信道品质条件为基础的认识流控制 - Google Patents
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Abstract
一种藉由聪明地使用在一无线电网络控制器(RNC)及一B节点间的数据流的控制以改善一无线通信系统的性能的系统及方法。该系统监测某些准则且若必须时适当地增加或减少在该RNC及该B节点间的数据流。此藉由允许重新传输的数据、发出讯号步骤及其它藉由减少在该B节点所缓冲的数据量而以一较快的速度成功接收的数据以改良传输系统的性能。当信道品质降级时,数据流控制被运用以减少在该B节点的缓冲且在高速下行链路共享信道(HS-DSCH)交接前。
Description
技术领域
本发明是关于无线电通信的领域,更特定言之,本发明是关于在第三代(3G)通讯系统中于无线电网络控制器(RNC)及B节点间数据传输流控制的运用。
背景技术
一种3G通用地面无线电存取网络(UTRAN)包括许多RNCs,每一个RNC伴随着一或更多B节点且每一个B节点进一步伴随着一或更多小区。
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)至至少一个用户设备(UE)的数据传输。然而,对3G蜂窝系统的高速信道,数据被调度以进行该B节点的传输。例如,这些高速信道的其中一个为高速下行链路共享信道(HS-DSCH)。因数据是由该B节点调度,必须在该B节点缓冲数据以传输至该UE(s),。
许多大量在该B节点缓冲的数据对系统的整体操作有负面影响的示例,一些这些示例将叙述于后。
第一个示例是关于在3G系统的重新传输机制以达到端点对端点数据传输的高可信度。熟知本技艺者应了解在该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发明意欲涵盖这些情况及数据传输的失败促使无线电链路控制器(RLC)重新传输的任何其它情况。
重新传输机制有许多层次。如一个机制为高速下行链路分组接入(HSDPA)的混合自动重发请求(H-ARQ)方法的传输。该H-ARQ方法提供一种机制,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)的标头发出序号(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SN=3的该PDU未被该UE成功接收时,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SNs=8及9的PDUs已在具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已被传输至该UE。此外,因至较高层的数据依序传送的要求,具SNs=4-9的PDUs不会通过较高层直到具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失联的PDU可被传送。此不仅造成传输的延迟,亦需要该UE具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地重新传输。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,此第一个示例为当需要RLC重新传输且在该B节点缓冲的大量数据造成较大的数据传输延迟及较高的UE内存要求。
第二个示例为当在该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)讯号及数据传输由相同调度方法进行或共享在该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讯号在其后,但讯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讯号或数据通过该缓冲器的时间愈长。任何高优先级的L2/3讯号因在该缓冲器的数据而被延迟。
第三个示例当在该B节点数据的缓冲负面地影响系统性能是因伺服HS-DSCH小区变化的情况。因该B节点执行HS-DSCH数据的调度及缓冲,当该UE执行自来源B节点至目标B节点的伺服HS-DSCH小区变化,有一种可能为在交接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制。当伺服HS-DSCH小区变化时,该RNC没有任何关于多少数据(若有时)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小区变化的情况,在该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。
发明内容
本发明为一种藉由聪明地使用在该RNC及在该B节点间的数据流的控制以改善无线通信系统的性能的系统及方法。该系统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、发出讯号步骤及其它要以较先前技艺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良传输系统的性能。当信道品质降级时,数据流控制被运用以减少在该B节点的缓冲且在HS-DSCH交接前。
在较佳具体实施例中,本发明于包含与该B节点(具至少一个缓冲器于其间以储存数据)通信的无线电网络控制器(RNC)的无线通信系统实施。该RNC发出讯号给该B节点,且要求该RNC送出一定量的数据至该B节点。该B节点监测所选择的品质指示器及基于该所选择的品质指示器计算缓冲器的容量分布。该B节点将容量分布讯号送至该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。
附图说明
本发明的更详细了解可由下列叙述、实例及相关相关图式而了解,其中:
图1显示在该RNC、该B节点、及该UE的数据的先前技艺缓冲。
图2显示在重新传输情况下,在该RNC、该B节点、及该UE的数据的先前技艺缓冲。
图3A及图3B共同为根据本发明方法监测信道品质及调整在该RNC及在该B节点间的数据流。
图4为使用第3A及3B图的方法,在重新传输情况下,在该RNC、该B节点、及该UE的数据的缓冲。
具体实施方式
本发明是参考图式叙述的,其中相同数字表示相同组件。虽然本发明以参考排列于缓冲器特定数目的PDUs(如数十PDUs)而被叙述,此提及的PDUs数目仅为简化用途,根据先前示例被传输及缓冲的PDUs实际数目更可能在数百PDUs或更多。本发明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的信道品质降级时,对UE本发明减少至该B节点的数据流,且该UE的信道品质改良时,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,本发明监测一或更多信道品质的参数,此数据流控制为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节点内部地产生,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,根据本发明监测通信信道品质及调整在该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54,该B节点54接收此容量要求及监测所选择的品质指示器(步骤60)。此所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节点内缓冲器的状态(步骤62)。如可由熟知本技艺者了解,虽然本发明以参考在该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节点内内部地产生。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授权以允许该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RNC 52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。
熟知本技艺者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可固定地被重复。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,根据本发明监测该B节点54及该UE 82间的通信信道品质的方法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讯号品质指示器(步骤86),例如信道品质指数(CQI)至该B节点54。此讯号品质指示器再被用做图3A步骤60中的所选择品质指示器。
可由熟知本技艺者注意的是方法步骤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,讯号品质指示器为定期自该UE 82传送,在此情况下,该UE 82可定期地或为响应特定事件传输一讯号品质指示器至该B节点54,该讯号品质指示器再被用做图3A步骤60中的所选择品质指示器。
如上所述,该所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的信道品质反馈。在此具体实施例,为下行链路信道品质的指针的CQI被使用。
在第二具体实施例,准则为该UE根据该H-ARQ方法所产生的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信道品质的指针。
在第三具体实施例,准则为该B节点选择的调制及编码组(MCS),其是需要的以成功地传输数据。如可由熟知本技艺者所了解当信道条件为差的时,非常强烈的MCS被使用。或者,当信道条件为良好时,较不强烈的MCS被使用且大量数据被传输。最强烈的MCS组的选择可被使用做为差的信道品质条件的指针,但最不强烈的MCS的使用象征信道品质条件为佳的。
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,信道品质条件的指针可能是差的,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信道品质条件为良好的指针且数据未向后移动。
在第五具体实施例,准则为“落”在该B节点的数据量。如可由熟知本技艺者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的数据,若大量的传输由该B节点掉落,此为信道品质条件为差的指针。
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。依通讯信道的品质而定,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,因改变信道品质条件,在预先决定时间内可被传输的PDUs量可被显著改变。例如,若信道品质条件为佳的,一百个PDUs可在一百毫秒的时间内被传输;然而,若信道品质条件非常差,仅十个PDUs可在一百秒的时间内被传输。
熟知本技艺者应了解可直接或间接显示信道条件的其它准则可根据本发明被利用。此外,依系统用户的特定需求,二或更多上述准则的组合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示例。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之前排列。如图4所示,与图2(具SNs=8的PDUs及在具SN=3的PDU之前排列)所示的先前技艺处理相较,数据流控制的运用减少具SN=3的PDU的重新传输的延迟,因此,具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PDUs4至8至较高层的传送。
仅管本发明已以较佳具体实施例叙述,在如权利要求所列出的本发明范围内的其它变化为熟知本技艺者明显易见的。
Claims (22)
1.在一包含与一具至少一个缓冲器于其中以储存数据的B节点通信的无线电网络控制器(RNC)的一无线通信系统通讯中,一种控制在该RNC及该B节点间的数据流的方法,该方法包括:
a.该RNC以一要求发出讯号给该B节点,该RNC送出一定量的数据至该B节点:
b.该B节点监测一所选择的品质指示器;
c.该B节点基于该所选择的品质指示器计算该缓冲器的一容量分布;
d.该B节点将该容量分布讯号送至该RNC;
e.为响应该容量分布的接收,该RNC根据该容量分布及至少一预先决定的准则所决定的一数据流速而传送数据至该B节点;及
f.该B节点据以调整该缓冲器。
2.如权利要求1所述的方法,其中该所选择的品质指示器是基于从至少一用户设备(UE)传输至该B节点的数据。
3.如权利要求2所述的方法,其中该所选择的品质指示器为一种信道品质指数(CQI),其显示在该UE及该B节点间所建立的一下行链路信道的品质。
4.如权利要求2所述的方法,其中该至少一预先决定的准则是基于该UE根据一混合自动重发请求(H-ARQ)所产生的一ACK或NACK。
5.如权利要求1所述的方法,其中该数据流速是增加以响应该所选择的品质指示器的一改善。
6.如权利要求1所述的方法,其中该数据流速是减少以响应该所选择的品质指示器的一降级。
7.如权利要求1所述的方法,其中该所选择的品质指示器是由该B节点于内部产生。
8.如权利要求1所述的方法,其中该至少一预先决定的准则是基于由该B节点所选择的一调制及编码组(MCS)。
9.如权利要求1所述的方法,其中该至少一预先决定的准则是基于该B节点的缓冲器内的一队列的深度。
10.如权利要求1所述的方法,其中该至少一预先决定的准则是基于落在该B节点的数据量。
11.如权利要求1所述的方法,其中该至少一预先决定的准则是基于在一预先决定时间内可由该B节点传输的数据量。
12.一种无线通信系统以控制数据流,该系统包括:
a.具至少一个缓冲器于其中以储存数据的一B节点;及
b.与该B节点通信的一无线电网络控制器(RNC),其中:
(i)该RNC以一要求发出讯号给该B节点,该RNC送出一定量的数据至该B节点:
(ii)该B节点监测一所选择的品质指示器;
(iii)该B节点基于该所选择的品质指示器计算缓冲器的一容量分布;
(iv)该B节点将该容量分布讯号送至该RNC;
(v)为响应该容量分布的接收,该RNC根据该容量分布及至少一预先决定的准则所决定的数据流速而传送数据至该B节点;及
(vi)该B节点据以调整该缓冲器。
13.如权利要求12所述的系统进一步包括:
c.与该B节点通信的至少一用户设备(UE),其中该所选择的品质指示器是基于自该UE传输至该B节点的数据。
14.如权利要求13所述的系统,其中该所选择的品质指示器为一种信道品质指数(CQI),其显示在该UE及该B节点间所建立的一下行链路信道的品质。
15.如权利要求13所述的系统,其中该至少一预先决定的准则是基于该UE根据一混合自动重发请求(H-ARQ)所产生的一ACK或NACK。
16.如权利要求12所述的系统,其中该数据流速是增加以响应该所选择的品质指示器的改善。
17.如权利要求12所述的系统,其中该数据流速减少以响应该所选择的品质指示器的一降级。
18.如权利要求12所述的系统,其中该所选择的品质指示器是由该B节点于内部产生。
19.如权利要求12所述的系统,其中该至少一预先决定的准则是基于由该B节点所选择的一调制及编码组(MCS)。
20.如权利要求12所述的系统,其中该至少一个预先决定的准则是基于该B节点的缓冲器内的一行的深度。
21.如权利要求12所述的系统,其中该至少一预先决定的准则是基于落在该B节点的数据量。
22.如权利要求12所述的系统,其中该至少一预先决定的准则是基于在预先决定时间内可由该B节点传输的数据量。
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