CN1647555A - 提供高速下行链路共享信道小区改变后有效回复节点b的缓冲数据的系统 - Google Patents

提供高速下行链路共享信道小区改变后有效回复节点b的缓冲数据的系统 Download PDF

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CN1647555A
CN1647555A CNA038077310A CN03807731A CN1647555A CN 1647555 A CN1647555 A CN 1647555A CN A038077310 A CNA038077310 A CN A038077310A CN 03807731 A CN03807731 A CN 03807731A CN 1647555 A CN1647555 A CN 1647555A
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CN100559902C (zh
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赵怡如
史蒂芬·E·泰瑞
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Apple Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H04W36/023—Buffering or recovering information during reselection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/36—Reselection control by user or terminal equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/12—Access point controller devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/10—Interfaces between hierarchically different network devices between terminal device and access point, i.e. wireless air interface

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Abstract

本发明是关于交递后、有效回复高速下行链路分组存取(HSDPA)数据的技术。本发明揭示一种方法及系统，以让该UE执行一连串动作、以便于该服务高速下行链路共享信道(HS－DSCH)小区改变程序期间缩短所述待时间和潜在地防止分组数据小区(PDU)在传输时发生漏失。一新的准则是被引进以供UE产生该RLC PDU状态报告。在通知该无线资源控制(RRC)程序所指示的该HS－DSCH小区改变后，该UE就尽快产生该PDU状态报告、以更有效地回复来源节点B的缓冲数据。可向每一与该HS－DSCH传送信道相关联的AM无线链接控制(RLC)事例传讯有关PDU状态。此外，一旦节点B间服务HS－DSCH小区改变时，该SRNC即可在等到PDU状态报告后、才开始传输目标小区中的新数据。

Description

提供高速下行链路共享信道小区改变后有效回复节点B的缓冲数 据的系统
技术领域
本发明是说明无线通讯的范畴。更特定言之，本发明是说明在一自一中介点分配数据的无线系统中交递后、有效地回复缓冲数据。包含一耦合至一个或多个节点B上的远程网络控制器(RNC)、且利用自适应调制和编码(AMC)和混合式自动重送请求(H-ARQ)技艺的第三代(3G)系统(其中所述一个或多个节点B又依次无线式耦合至多个用户设备(UE)上)仅为该种系统的一个实例。
背景技术
一第三代(3G)通用地面无线存取网络(UTRAN)包括数个RNC，其中所述每一RNC均可耦合至数个节点B上。一节点B为一包括一个或多个基站的实体，其中每一基站管理一个或多个小区的流量。
所述3G分频双工(FDD)和分时双工(TDD)系统一般利用该RNC来缓冲和调度(scheduling)传输给该UE的数据。然而，就所述3G蜂巢式系统的高速信道而言，则是由一节点B来缓冲和调度要传输的数据。该其中一个高速信道例如为该高速下行链路共享信道(HS-DSCH)。因由该节点B来分配数据，故须将要传输的数据缓冲在节点B中。该结构导致该RNC未取得该节点B其控制分组数据小区(PDU)传输的一最新状态。因此，一旦在小区间交递时，则须因应该小区改变来协调所述数据传输的调度。不然，则须在该小区改变后、使数据传输重新同步化，以避免传输的数据“漏失”或“重复传输”。于3G网络中，是由该RNC控制小区间的交递。因用来控制包含该UE的小区的RNC会改变，故数据有可能因该交递而漏失或重复。由于该结构中每一RNC是与数个节点B相关联，致使该问题更加严重。由于UE小区的交递，故一行动UE要求一节点B改变的可能性远比其要求一RNC改变来得大。
该HS-DSCH利用AMC致能高速传输数据，及利用H-ARQ来增加成功传递数据的可能性。当该UE须改变该正在传输和接收该服务HS-DSCH无线链接的UTRAN存取点的相关联小区时，则导致一服务HS-DSCH小区改变。当一替换小区意识到实体信道条件和/或实体容量改善时，则引动该服务HS-SDCH小区改变。不同于3G网络中的其它信道，该HS-DSCH是在节点B上中断、而不是在该UTRAN内的RNC上中断。
有两种HS-DSCH小区改变型式。当该UE在两个与该同一节点B相关联的小区间改变时，则为一节点B内的服务HS-DSCH小区改变。当该UE在两个与不同节点B相关联的小区间改变时，则为一节点B间的服务HS-DSCH小区改变。就一节点B间小区改变而言，将该服务HS-DSCH小区改变之前的节点B称为该来源节点B；且将该服务HS-DSCH小区改变的后的节点B称为该目标节点B。
该RNC和该UE中均有同层无线链接控制(RLC)实体，提供一用作传输数据的自动重送请求(ARQ)功能。该传送RLC实体传讯该PDU标头中的序号(SN)，其中该接收RLC实体利用该序号以确保该传输期间未漏失任何PDU。如于该传输期间漏失了若干PDU时(因未按顺序传递PDU所致)，则该接收RLC实体传送一PDU状态报告、以通知该传送RLC实体“某些PDU漏失了”。利用该PDU状态报告说明该数据传输的状态。其中该PDU状态报告识别所述漏失或收到的PDU的序号SN。如漏失了一PDU，则该传送RLC实体会将该漏掉的PDU的复本重新传输给该接收RLC。
该传送RLC实体亦可能向该接收RLC实体轮询一PDU状态报告；或可能定期地产生状态报告。该轮询功能提供一机制、供该传送RLC实体请求所述PDU传输的状态。
该节点B的一H-ARQ功能亦提供了将失败传输再重新传输的功能。虽然该H-ARQ作业会将某些失败的传输移除和提高成功传递数据的机率，然而最后确保成功传递的却是该RLC协议层。
由于传播条件的动态改变，故须快速地执行该HS-DSCH小区改变，以维护服务品质。于该服务HS-DSCH小区改变期间，该UE有可能停止该来源小区中的传输和接收、直到传输完所有目前储存在该来源节点B中的PDU时为止。因该来源节点B调度和缓冲该数据，且因所述数据传输速率非常高(例如一千万位/秒或更高)，故当该UE执行一服务HS-DSCH小区改变时(特别是一节点B间的交递)、大量缓冲在该来源节点B中的数据有可能会漏失掉。其中一个原因为该UTRAN结构内并未提供任何机制用以将该来源节点B上的缓冲数据转移给该目标节点B。一旦提供了一HS-DSCH小区改变，则因未通知该RNC“节点B的数据传输调度”、故该RNC不知道有多少数据漏失掉(若有的话)，且该RNC亦不知道该UE是否有成功地回复确认该传输。故一旦提供了HS-DSCH小区改变后、如仍有数据缓冲在该来源节点B中时，则该RNC RLC须回复该数据、以保持传输而不致漏失该数据。
目前，先前技艺系统有两种较佳的方式来回复该来源节点B上的缓冲数据。即于该HS-DSCH小区改变后：1)该RNC可明确地向该UE请求一PDU状态；或2)该RNC可仅只从该来源小区中遭停止的地方开始传输，且该UE藉由其察知的未按顺序传递产该PDU状态。
于该第一种情况中，该RNC藉由轮询该UE以明确地请求一PDU状态，该RNC须先等到该新小区中设立了该实体信道为止。接着，该RNC传送该PDU状态请求，且该UE接收和处理该请求。该UE产生该PDU状态，及将该PDU状态传回给该RNC，其中该RNC处理该PDU状态和判定哪些PDU需重新传输。
于该第二种情况中，该RNC仅从该来源小区中遭停止的地方开始传输PDU，及该UE辨识该未按顺序传递的数据和产生一PDU状态传回给该RNC。该RNC处理该该PDU状态和得悉哪些PDU需重新传输。
于上述两种情况中的任一种，如需回复该来源节点B中的缓冲数据时，则会去处理一PDU状态；然而，却严重地延误了该UE其适当接收重新被传输数据的时间。此是因延误了该UE产生该PDU状态的时间，从而延误了该RNC收到该PDU状态的时间。
如在RLC回复确认模式下执行传输时，则直到可循序传递数据时、才将数据传送给较高层。如是，会要求该UE缓冲该未按顺序的数据、直到可重新传输所述遗漏的PDU时为止。此不仅延误了该传输，同时亦要求该UE拥有一大到足以缓冲数据的内存、直到可成功地传递储存在该来源节点B中的数据为止。否则该有效数据传输率会降低，从而影响服务品质。因内存很贵，故此为一不当的设计限制条件。
如是，所述在将一来源节点B的缓冲数据转移给一目标节点B之前、先回复该缓冲数据的先前技艺方法会产生极不良的后果。一种可在较短的时间内更有效回复该来源节点B的缓冲数据、以适当维护用户服务品质需求的系统及方法是较可取的。
发明内容
本发明为一种执行一连串行动、以便于该服务HS-DSCH小区改变程序期间缩短所述待时间和潜在地防止PDU在传输时发生漏失。引进一新的准则供UE产生该RLC PDU状态报告。在通知了该RRC程序所指示的该HS-DSCH小区改变后，该UE就尽快自治地产生该PDU状态报告、以更有效地回复来源节点B的缓冲数据。可向每一与该HS-DSCH传送信道相关联的回复确认模式的(AM)RLC事例传讯有关PDU状态。
附图说明
图1为一根据本发明、用以于一HS-DSCH小区改变后有效回复节点B的缓冲数据的有效程序的流程图。
图2为该RNC等到一PDU状态、才开始传输该目标小区中一新数据的另一种方法的流程图。
具体实施方式
将就所述图式说明本发明较佳具体实施例，其中于所有图式中、同样的号码代表同样的组件。
根据本发明，为了在该服务HS-DSCH小区改变后、缩短该RNC取得所述PDU状态和回复该来源节点B的缓冲数据的等待时间，故在通知了该RRC程序所指示的该HS-DSCH小区改变后、该UE就自治地将所述PDU状态传送给该RNC。可将该产生的PDU状态用于每一与该HS-DSCH传送信道相关联的AM RLC事例上。
参考图1的流程图，说明一种根据本发明、有效回复节点B的缓冲数据的方法10。该RNC辨识出需提供该HS-DSCH小区改变(步骤12)。接着，通知该节点B“该服务HS-DSCH小区改变”(步骤14)。通知该UE“该服务HS-DSCH小区改变”(步骤16)，如经由该RRC请求讯息所指示。请注意，亦可能在步骤14之前先引动步骤16、而无任何不利的后果。
一旦该UE收到了该RRC请求讯息时(步骤18)，该UE即在被通知了该RRC程序所指示的该HS-DSCH小区改变后、尽快产生一指示该RLC PDU状态的状态报告(步骤20)，以于回复该来源节点B的缓冲数据时缩短延迟时间。该UE未等待该任一先前技艺中用以产生一PDU状态的触发器(例如该RNC请求产生一PDU状态、亦或该UE侦测到未按顺序传递数据)。
该UE可执行许多不同的替代方法、以在一服务HS-DSCH小区改变后引发产生一PDU状态报告。然而于此提出数个实例。如一第一选择，一旦清除了该MAC-hs其重新排序的缓冲区时、该MAC-hs较佳就通知该RLC。一第二选择为该RRC通知该RLC“指示该服务HS-DSCH小区改变的第3层(L3)RRC程序。第三，该物理层可通知该RLC”收到该目标小区中的HS-DSCH控制信道；或一旦HS-DSCH控制转换到该目标小区时、该物理层即可通知该RLC。熟谙此艺者必定会意识到亦有其它的方法可用以触发欲从该UE传送给该RNC的RLC PDU状态讯息。由于该程序，故在较短的时间内产生该PDU状态和将该PDU状态传送给该RNC(步骤22)，从而导致更有效地回复来源节点B的缓冲数据。
根据步骤22，有数种选择供该UE将该PDU状态报告传送给该RNC。所述传送该PDU状态的方法为该UE可如何向该RNC传讯该PDU状态的实例(非本发明的首要事物)，其中是说明一旦有一新的准则时、即产生一PDU状态。该UE较佳产生一RLC状态报告给每一映像到该HS-DSCH传送信道上的AMRLC事例。
一第二选择为“一旦取得一PDU状态报告时、该UE即经由该第一现行上行链路讯息从该UE传送给该RNC”。就节点B内服务小区改变而言(及假定该HS-DSCH传送信道和无线载运参数未改变)，该DCCH上的讯息为“实体信道重整完成”。如该HS-DSCH传送信道和无线载波参数改变了、和/或就节点B间服务小区改变而言，该DCCH上的讯息为“传送信道重整完成”。可于任何RRC传讯讯息中识别该PDU状态。接着，该RNC RRC实体通知该RLC“所述PDU的状态”、以再继续传输给该目标节点B。
一第三选择为“该UE将该有关DCCH上一新的L3传讯讯息的状态报告从该UE传送给该RNC”。将该新讯息从该UE的无线资源控制(RRC)层传送给该RNC的RRC层。接着，该RNC通知该RLC层“所述PDU的状态”、以再继续传输给该目标节点B。如是，该图1中所示的PDU状态讯息可包括两个不同的讯息“RRC”和“RLC状态”。
请注意，该PDU状态报告的特殊格式可改变。例如，所述PDU状态报告的格式可包含：1)所述最后循序成功传递的PDU的该序号(SN)；2)所述成功收到的PDU的该最高序号SN；3)所述未成功收到的PDU(即漏失掉的PDU)的序号SN，其中至高到所述成功收到的PDU的该最高序号SN；4)或一列示所述成功收到的PDU的序号表列。
一旦该RNC收到附有该PDU状态的讯息时，则该RNC RLC处理该PDU状态讯息(步骤24)，以判定所述漏失的PDU。现在该RNC意识到因该小区改变而漏失的数据，及可将该漏失的数据重新传输给该UE(步骤26)。请注意，该讯息可有许多种，而未必只将其限制在“附有该PDU状态报告”上。
亦请注意，于本发明该具体实施例中，该RNC可于步骤16与24间继续转递该目标小区中要传输给该UE的数据，以将该数据。因如未成功地传输来源节点B上所有缓冲的数据时、该数据的顺序就会乱掉，故会强迫该UE RLC缓冲该数据、使数据能够循序传递给较高层。此要求该UE拥有一足够储存所述顺序混乱PDU的内存。在漏失了任何循序的数据后，则传输是限制在该UE的内存能力上、直到成功传输了该漏失的循序数据为止。
现参考图2的流程图，说明一种根据本发明另一具体实施例、有效回复节点B的缓冲数据的方法40。方法40类似于图1所示的方法10，且图2所述步骤的标记与图1完全相同。然而，根据本发明该具体实施例，方法40包含一新步骤17，其中该RNC停止所有通向该UE的下行链路HS-DSCH传输、直到处理了该PDU状态讯息(步骤24)为止。该具体实施例使重新传输来源节点B的缓冲数据时所延迟的时间缩到最短，及限制了须缓冲在该UE上的数据量。
就该延迟时间最短化而言，该节点B并不知道RLC的传输序号，且节点B内的传输调度是以先进先出(FIFO)为基础。因此，如该目标小区的RNC是在该PDU状态被处理之前就转递数据时，则会先传送该数据。该队列在节点B中的数据有可能使重新传输该来源节点B的缓冲数据所需的时间更长。
本发明可适用于节点B间小区改变和节点B内小区改变两者中的HS-DSCH小区改变。因于于该节点B内的事例中，该节点B由于内部设计问题而不可能将该缓冲的HS-DSCH数据重新导向该目标小区，故该RNC可指示需产PDU状态给两种事例。该UE亦可能无法辨别一节点B间小区改变与一节点B内小区改变，故亦导致产生PDU状态给节点B间和节点B内两种事例。就无法将该缓冲的数据转换给该目标小区的该节点B间或节点B内小区改变的事例而言、以该一种方式传送该PDU状态是有益的。
虽然已详述了本发明，但应了解的是并未将本发明限制在那里，且可在未脱离权利要求对本发明所定义的精髓和范畴内于其中作种种改变。

Claims (6)

1.一种用以促进一高速下行链路共享信道(HS-DSCH)小区改变的系统，其中该系统包括一至少耦合至一个节点B上的远程网络控制器(RNC)，且该至少一个节点B更进一步耦合到至少一个用户设备(UE)上，该系统包括：
一位于该RNC上的无线资源控制(RRC)小区，用以判定一HS-DSCH小区改变何时为必要的，及用以产生一有关该小区改变的通知；
一位于该UE内的控制小区，用以接收该通知、产生一指示该每一PDU状态的状态讯息、及将该状态讯息传送给该RNC；及
一在该RNC上的控制小区，用以读取该状态讯息，及根据该状态讯息用以将PDU重新传输给该UE。
2.一种用于一系统中高速下行链路共享信道(HS-DSCH)小区改变的方法，其中该系统包括一至少耦合至一个节点B上的远程网络控制器(RNC)，且该至少一个节点B更进一步耦合到至少一个用户设备(UE)上，及其中该方法包括：
该RNC侦测出需要一HS-DSCH小区改变；
通知该UE该小区改变；
判定在该UE上收到的数据的状态；
根据该UE上所收到的数据的状态产生一状态报告；
将该状态报告从该UE传输给该RNC；及
该RNC根据该状态报告判定该欲传输给该UE的数据。
3.一种促进一来源小区到一目标小区的高速下行链路共享信道(HS-DSCH)小区改变的用户设备，包括：
位于该UE上用以判定一小区改变何时为必要的装置；
用以在该小区改变之前判定该欲传输给该UE的数据其状态的装置；
用以根据该判定产生一状态报告的装置；及
用以传输该数据状态报告的装置。
4.如权利要求3所述的用户设备，其中该数据包括分组数据小区(PDU)。
5.如权利要求4所述的用户设备，其中该状态报告包括一PDU状态。
6.如权利要求3所述的用户设备，其中该第一判定装置包括用以接收一指示一HS-DSCH小区改变的请求讯息的装置。
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