CN2624558Y - 能支持使用共享频道点对多点服务的b节点 - Google Patents
能支持使用共享频道点对多点服务的b节点 Download PDFInfo
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Abstract
一种B节点包括多个控制频道产生器,各控制频道产生器产生多个使用者中一对应使用者的控制频道,并于该控制频道传送服务识别符。一共享频道产生器用以产生共享频道、传送于指示点对多点服务的传送的共享频道上的服务识别符产生共享频道,以及传送该共享频道上该点对多点服务的点对多点传输。一多点同步装置,用以在该控制频道及该共享频道上同步该服务识别符的该传送。一量测接收器,用以接收功率控制命令,以使该点对多点服务的使用者控制该共享频道的功率位准。
Description
(1)技术领域
本实用新型有关一种无线通讯系统,特别是有关此种系统的点对多点服务。
(2)背景技术
在无线通讯系统中愈来愈希望使用点对多点服务,如图1所示,在点对多点,一种服务是自单一点,如基地台,送至多点,如多数用户设备121-12a。点对多点服务的实例为多媒体广播及群播服务。
在第三代伙伴项目(3GPP)提出系统,可被用于此种服务的一个经提出频道为转送接取频道(FACH)。该FACH为一种下行共通传输频道(TrCH),其可由所有使用者接收。该FACH TrCH藉由将其施用其于次要共通控制实体频道(S-CCPCH)而被传播。该S-CCPCH被传送至所有单元使用者。
为限制分配至该S-CCPCH的无线电资源,该S-CCPCH数据速度被限制。为说明,若高数据速度服务在该S-CCPCH上被传输,则需要使用低数据冗余来传输以达到高数据速度。因该S-CCPCH是传输至整个单元,其在所欲服务质量(QOS)在该单元周围足以由使用者接收的功率位准下传输。由于胞元资源的无效率使用,在此功率位准下传播高数据速度服务会增加至其它使用者的接口,减少系统容量,其为非常不欲的。
加上因该S-CCPCH及FACH的传播本性,该S-CCPCH及FACH所需的无线电资源为非常静态的。由于这些频道上的频道分布及信息是由第3层信号技术以较低速率提供,该S-CCPCH所使用的调变及编码组(MCS)及传输功率位准需为足够的以在该单元周围维持所欲的QOS。控制实体频道(S-CCPCH)结构的静态本质,并不允许这些介质的动态调整以做无线电资源的有效使用。此外,预定的传输也发生在此低的速率下,但并不允许此无线电资源的有效使用,亦不允许数据流的有效地多路传输至每个使用者。
另一个可以使用来提供点对点(PtP)服务的频道是下行线路共享频道(DSCHs)。此下行线路共享频道(DSCHs)可为多个使用者共享,经由下行线路共享频道(DSCHs)传输至不同的使用者(使用者的设备)是由时间来区隔。因此,此下行线路共享频道(DSCHs)是时间共享频道。
每个使用者使用此下行线路共享频道(DSCHs)为具有一上行及下行专用控制频道。这些控制频道可使下行线路共享频道更有效的使用,每个使用者经由此下行线路共享频道(DSCHs)的传输能有更强的控制,以及允许电波的形成以更佳的区隔使用者的传输。使用下行线路共享频道(DSCHs)而产生的强力控制与电波形成,比FACH频道所能提供的,为更佳的资源利用。
为期于DSCH接收信息,使用者首先监控其专用下行控制频道。该下行控制频道中的丛发可能俱有传输格式组合指示器(TFCI)的第一部份及第二部份。该第一部份指示下行专用频道的该传输格式,而该第二部份则指示一后续DSCH传输的存在及传输格式。如传输于使用者的DSCH传输是将送至使用者,该下行控制频道有该TFCI组的该第二部份。在一特定时期后,传输将发生于后续传输时间周期(TTI)。使用者随后监控DSCH以行传输。为确认使用者乃DSCH传输的正确收受者,将检查该传输的使用者辨识符。如传输非欲传送,TFCI的该第二部份将不会出现于该下行专用控制频道。
虽然该HS-DSCH允许无线电资源的更有效利用,但仅点对点服务可由该HS-DSCH处理。为处理多重接收点,多重传输必须在该HS-DSCH上进行。此种有别于DSCH多重传输使用大量的无线电资源,其为不欲的。因此,多数使用者传输要求有别于DSCH的许多使用有价值的无线资源传输。
(3)实用新型内容
因此,本实用新型的目的是提供一种弹性机构以提供点对多点服务。
为实现上述目的,本实用新型提供一种B节点,包括:多个控制频道产生器,各供产生多个使用者中一对应使用者的控制频道,并于该控制频道传送服务识别符;一共享频道产生器用以产生共享频道及传送于指示点对多点服务的传送的共享频道上的服务识别符产生共享频道,并传送该共享频道上该点对多点服务的点对多点传输;一多点同步装置,用以在该控制频道及该共享频道上同步该服务识别符的该传送;以及一量测接收器,用以接收功率控制命令,以使该点对多点服务的使用者控制该共享频道的功率位准。
(4)附图说明
图1是显示一单点对多点服务的实施例;
图2是显示较佳共享频道的实施例;
图3是显示一较佳无线网络控制器/节点B及使用者设备的一简化图;
图4是显示对一较佳共享频道而言,具有一排程机制的一较佳无线网络控制器的简化图;
图5A~E是显示对共享频道信号的较佳排程实施例;
图6是显示通过下行线路共享频道,对建立及传输一单点对多点服务的较佳
实施例;以及
图7是显示通过一共享频道,使用传输动力控制及光束掌控的一较佳节点B及使用者设备的简化图。
(5)具体实施方式
虽然较佳实施例是与一较佳3GPP提出系统结合而加以描述,他们依然可以使用单点对多点传输而与其它无线系统一起被使用。
图2是为一较佳共享频道16及其相关下行及上行线路的专属控制频道141-14N。虽然该较佳实施例使用下行及上行线路专属控制频道,但传送到这些频道的信息,在另一个实施例中,可以由其它装置来传送,如由一般控制实体频道(CCPCH)或2/3层信号。一群使用者,UE1121,….,UEJ12J,…,UEN12N,接收一共享服务16。对每一使用者的一下行线路专属控制频道141-14N,其被用来建立该共享频道及其它控制目的。该共享频道16是由一基地台10所传送,并由该群UEs121~12N所接收。UEs,如UEX12X,并不会接收在其专属控制频道14X中的该共享频道配置指示,也不会接收该共享频道16的数据。
图3为通过该共享频道以传递数据的一RNC20/节点B 18及UEs及UEJ12J其中之一的一简化图。在RNC20/节点B,每一个下行线路专属控制频道(DDCC)产生器241-24N会产生一控制频道信号给每一个UE121-12N。一多点同步装置25被用以同步DSCH的配置,而在使用者的DDCC上认证一般PtM服务的使用者族群。对一个UEJ12J而言,其专属控制频道是藉由天线32或天线数组通过无线发送接口22而播送,其被该UEJ12J的一天线34或天线数组所接收,而且由一控制频道接收器36所处理以恢复该频道的该控制信息。
一下行线路共享频道产生器26产生该共享频道,并通过该无线接口22而传送。该共享频道信号被该UEJ12J利用其天线34或天线数组所接收。该共享频道的信息通过一下行线路共享频道接收器38并利用专属控制频道信息而被重新恢复。一共享频道量测装置40会进行该下行专属频道及/或共享频道的频道品质测量/信息,如接收的信号码电源、相关的干扰、以及区域错误率(block error rate)。该测量/信息被传送到该RNC20/节点B18。典型的,此一频道品质测量/信息是使用光线成形的传送电源命令(TPC)、相位改变及振幅信息,以及所接收电源及干扰的测量的数值。
一测量接收器30,位于RNC20/节点B18,从所有共享频道的使用者恢复该频道测量。一电源控制装置28使用该频道量测/信息以对该共享频道设定该电源层次。另外,一传输差异装置29可以利用该相位改变及振幅信息以对该共享频道设定光束形成。较佳者,该电源层次及光束形成在每一传输时间间隔(TTI)皆进行更新,虽然可能需要较久的时间。
该专属频道将继续被提到。该接收的BLER被用于决定一信号对干扰比(SIR)的目标。根据该接收并评估的SIR,TPC命令就会产生。当DSCH被激活时,该电源需求是衍生自该专属频道。然而,其并不都完全一样,既然BLER需求及物理配置在它们之间是不同的。对依PtM传输而言,该传输电源层次被设定以达成自该所需QOS到伴随对PtM传输有最糟接受品质的使用者。其亦有可能删去在PtM使用者族群中其QOS需求因在此传输中的物理限制而无法达成的使用者。
为了具有多次数据流的服务而言,该各式次数据流的该传输特性可以分开的被掌握。举例而言,一多媒体服务可以有一音讯、视讯或次文字流。每一次流的QOS可以不同,以允许不同传输贡献被每一次流所使用。除了传输每一次流以符合最高QOS次流的需求,他们在个别DSCH传输上,可以被分开掌握。
图4是为一较佳无线网络控制器(RNC)42的简化图。该较佳RNC42具有一排程机制46。该排程机制46在每一TTI被使用来排程(scheduling)数据,虽然可能需要较多的排程时间。该排程机制46接收数据,然后将其通过共享频道资源而被传递。该接收的数据包括PtP及PtM服务的数据。该排程机制排程在PtP及PtM传输中传输的数据。为了排程该信息,该排程机制46考虑包括其所需数据潜伏因素及生产力的每一传输所需的QOS,以及包括胞元的所有电源需求以及每一频道及光束掌控信息。对每一个TTI而言,该排程机制对胞元测量的最佳应用在其决定排程该数据传输。举例而言,在一特殊的TTI,所有的胞元电源区求几乎可以达到。如果该PtM服务可以延迟,则该PtM服务传输可以延迟一个或两的TTI,直到所有胞元电源需求下降。如果此一因TTI弹性的TTI不可得,则会下一资源决定并有一特定的时间期间不能改变,如100毫秒或一秒。在这些情形下,资源被配置并且在那段时间内不能改变。结果,一些原本会传递的传输因闲置地配置资源而无法传递。该RNC42传递信号到该UEs121-12N,该频道以及该PtP及PtM传输的时间。当维持高DSCH胞元资源的利用时,以TTI为基础而排程提供一较好的能力以达成该QOS及数据潜伏需求。胞元物理频道以及PtP/PtM数据传输需求会戏剧性的改变,因此,当对胞元物理资源做最有效应用时,一个可以快速反应这些改变的排程机制46提供改善的能力,已可达成QOS需求。
该排程机制46也可以被考虑到物理传输需求。举例而言,一个使用者或使用者族群比起另一个可能需要一更坚实的MCS。该排程者46然后可以为PtP使用者或PtM使用族群排程以最大化可用资源的使用。既然对特定QOS需求的数据可得,及可得物理资源及频道品质测量在一TTI基础上的改变,在此间隔中排程的能力改善了许多的满足的使用者及整体对物理资源的应用及效率。
对每一TTI的较佳排程而言,其藉由减少闲置无线资源的出现而减低在服务间的资源冲突。此外,该TTI排程颗粒(granularity)允许在空中(fly)由PtP传输到PtM传输的改变,反之亦然。为了举例,一多媒体服务藉由一PtM传输而被传送到多使用者。对依特定的TTI而言,只有一个使用者需要该传输,同时,该排程机制46将TTI服务传输排程为PtP。在下一个TTI中,多使用者需要该服务传输,所以一PtM传输就被排程。使用较佳排程机制46,该PtP及PtM服务可以经由多点不连续的TTI配置而被分割并再组合。此排程机制46更进一步增加无线资源指派的弹性,而使得有较佳的无线资源效率。
图5A~E是在显示通过一PtM服务对该共享频道的一可能配置。在专属控制频道141-14N中,对每一个PtM使用者族群(使用者1至使用者N)中接收该服务的使用者传送控制信息,如图5A所示。如图5B所示,对一3GPPFDD系统而言,有使用一芯片组DOFF以错开使用者TTI的开始。对每一个PtM使用者族群中的使用者而言,如图5A~B所示,一服务传输指示器STI50被随着该专属控制信号一起传送。该服务传输指示器50则指示将会通过共享频道60传送的服务数据。该较佳服务传输指示器是在专属下行线路控制频道突发传输中的TFC的第二部分,虽然可能使用不同指示器,如一个位或一个字。在一设定的时间期间的后,该服务数据被通过该共享频道16而传送。该传送的服务数据,较佳者,具有一与该服务有关的ID52。此服务ID(SID)52被用于核对正确族群的接受者接收了该传输。
图5C是显示在多PtM服务的配置。使用者1及2在族群A中并接收一PtM服务。使用者2及3在一族群B中并接收另一个PtM服务。一特别的使用者可以接收多PtM及PtP服务。如图5C所示,使用者2接收两个PtM服务。在DDCCs141到14S中,对每一个使用者而言,一服务指示器501、502被传送已指示一相对应的服务传输已经被通过其DSCH而传送。该多服务可以被通过相同的DSCH或多DSCH161、162。每一个服务传输有其服务ID521及522。在图5D中,该STI501及502以及该DDCCs在时间上被错开。然而,通过不同共享频道161、162的传输可以同时。
在图5E中,对一不同的发送训方法,多使用者族群1-G可以接收一服务。每一使用者具有一DDCC1411到14GN,并接收一STI以指示该PtM传输。UE族群1-G接收该服务。在共享频道中被传输的数据,对每一个接受族群而言,包含一族群ID(GID)541-54G。
图6是为本案一较佳实施例的流程,其描述了的通过下行分享频道(DSCH)的单至多点服务的信号建立及传送。UMTS全球广播入口网络(UMTS Terrestrialradio access network;UTRAN)系统70将信号传至每一个使用者,而使用者设备12则接收来自传送归属的信号服务74,被传送至单至多点服务的数据则藉由UTRAN系统70由核心网络接收。每一PtM服务的使用者不一定会自动或安装为同时接收该服务。,即使当该服务持续不间断,使用者可能在任何时间注册该服务,又或者使用者可在进入某特殊PtM服务地区时注册该服务。使用者可自行安装以接收传送,并监控其对DSCH配置点的专用控制频道。
每一使用者可维持其与专用频道的往上及往下连结,并传送频道信息到UTRAN系统70和76,例如:接收的干扰、接收的电源、估计的路径损失及位置信息。该接收的干扰及路径损失也可使用TPC来指出,而位置信息则能以相点位移方式来发出信号。对于在每一PtM使用族群中所有使用频道信息的使用者,UTRAN系统70建立了配置DSCH传输的要件,例如传输电源等级以及电波形成需求78。详细地说,若未使用电波形成,则UTRAN系统70将设置一般的传输电源等级为对使用者为最差接收品质的收讯,例如使用者可能会有最大的路径损失。然而若使用电波形成,则每一电波的电源等级则是以该电波中使用者有最差品质为基础。为了电波形成,便使用位置信息而将使用者依其位置而分组,并建立用以服务该群组所需的号码、_大小及电波形状。为了使广播资源使用最佳化,较佳者,这些参数值将会在每个时间传输间隔(TTI)更新,虽然更新的较长时间间隔可被传输同等信息与信号发送步骤层3使用,最佳者则是在每一使用者往上连结的专用频道上作更新。
UTRAN系统70将服务指针以画面和声音一致的方式80传送到使用者族群的每一使用者专用控制频道。族群的每一使用者可自行安装以接收PtM传输82。
由于分享频道传输的指针通常不太能耐受错误,最佳者,一识别信号将会传到DSCH。然而,根据另一实施例,并未使用DSCH识别信号。在PtP服务中,一特定使用者识别信号将会与DSCH传输一起被传送出去。而在本案的较佳实施例中,一能被PtM族群中所有使用者辨识的PtM服务识别信号将会与DSCH一起传送84。每个使用者再核对其与服务传输一起传送的必须是PtP使用者专用识别信号或是PtM服务识别信号。接到的服务信息再传送到UE121-12N的一般交通频道。
图7是为本实用新型的一较佳实施例的DSCH中的节点B18及UE12J,其使用最佳化电源控制及电波操纵。该UE12J使用其天线72通过无线广播接口64接收DSCH。DSCH数据再由使用者接受器66回复。一使用者回馈传输器68则送出频道信息回节点B18,例如TPC及相位移信息。而节点B18再将来自所有使用者与的利用使用者回馈接收器62的PtM使用者族群的频道信息回复。
通过DSCH传送到每一PtM使用者的数据是由DSCH产生器58所产生。电源控制装置58建立了DSCH电源控制等级或是每一使用接收回馈信息的DSCH电波。DSCH的电波则是由一电波操纵控制器60所决定,其可为节点B’天线数组的天线701-70N提供适当的强度及重量值。
Claims (3)
1.一种B节点包括:
多个控制频道产生器,各供产生多个使用者中一对应使用者的控制频道,并于该控制频道传送服务识别符;
一共享频道产生器用以产生共享频道及传送于指示点对多点服务的传送的共享频道上的服务识别符产生共享频道,并传送该共享频道上该点对多点服务的点对多点传输;
一多点同步装置,用以在该控制频道及该共享频道上同步该服务识别符的该传送;以及
一量测接收器,用以接收功率控制命令,以使该点对多点服务的使用者控制该共享频道的功率位准。
2、 如权利要求1所述的B节点,其特征在于,还包括一天线,用以发射该控制频道及该共享频道,以及接收该功率控制命令。
3、如权利要求1所述的B节点,其特征在于,还包括多个天线,用以发射该控制频道及该共享频道,及接收该功率控制命令;以及一传送多样化装置用于该共享频道上成束该点对多点传送。
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