CN1984372A - 无线通信系统中使用高速共享信道的点对多点服务 - Google Patents

无线通信系统中使用高速共享信道的点对多点服务 Download PDF

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CN1984372A
CN1984372A CNA2006101728064A CN200610172806A CN1984372A CN 1984372 A CN1984372 A CN 1984372A CN A2006101728064 A CNA2006101728064 A CN A2006101728064A CN 200610172806 A CN200610172806 A CN 200610172806A CN 1984372 A CN1984372 A CN 1984372A
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史蒂芬·E·泰利
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    • H—ELECTRICITY
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    • H04W72/30—Resource management for broadcast services
    • 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
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0041—Arrangements at the transmitter end
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    • 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
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
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    • H—ELECTRICITY
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    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • 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
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0093—Point-to-multipoint
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
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Abstract

服务数据在无线通信系统被传输，一种第一服务标识被传输以由在该系统中的一小区的一组用户所接收。该组用户不包括在该小区的所有用户。该组用户的每一个接收该服务标识。该组用户的每一个监测在高速下行共享信道(HS－DSCH)传送的第二服务标识。该服务数据是与该第二服务标识在该HS－DSCH传送。该组用户的每一个侦测该第二服务标识及接收该HS－DSCH的服务数据。

Description

无线通信系统中使用高速共享信道的点对多点服务
本申请是提交于2004年4月30日，申请号为03809802.4，题为“无线通信系统中使用高速共享信道的点对多点服务”的专利申请的分案申请。
技术领域
本发明一般是关于无线通信系统，跟具体地说，本发明是关于此种系统中的点对多点服务。
背景技术
在无线通信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，如基站，送至多点，如用户设备。点对多点服务的实例为多媒体广播及群播服务。
在第三代合伙人计划(3GPP)提出的系统，可被用于此种服务的一个经提出信道为转送接取信道(FACH)。该FACH为一种下行公共传输信道(TrCH)，其可由所有用户接收。该FACH TrCH藉由将其施用于次要公共控制物理信道(S-CCPCH)而被传播。该S-CCPCH被传送至所有小区用户。
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。为说明用途，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是传输至整个小区，其在所欲服务质量(QOS)在该小区周围足以由用户接收的功率位准下传输。在此功率位准下传播高数据速度服务会增加至其它用户的接口，减少系统容量，其为非常不欲的。
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。该S-CCPCH所使用的调制及编码组(MCS)及传输功率位准需为足够的以在该小区周围维持所欲的QOS。
一种被提出用于3GPP系统的共享信道为高速下行共享信道(HS-DSCH)。该HS-DSCHs为高速信道，其为由小区用户(用户设备)时间共享。每一个传输的目标为个别用户且在该HS-DSCH上的每一个用户的传输是由时间分开。
至一个用户的该HS-DSCH传输伴随着上行及下行专属控制信道。每一个用户经由在上行控制信道发信信号(signaling)的层1及层3传送测量，使用这些测量，一种调制及编码组(MCS)被选择以用于此用户的传输。该MCS可每2至10毫秒变化。经由小心选择用户传输的MCS，最不稳健性(最低数据冗余)MCS可被选择以维持所欲服务质量(QOS)。结果，无线电资源被更有效地利用。
为决定何时特定用户的传输可在该HS-DSCH上传送，该用户首先在该下行控制信道组寻找其被编码在循环冗余码(CRC)的UE ID及译码该下行控制信道以得到HS-DSCH分配数据。在一预定期间后，该UE接收该HS-DSCH而得到具其UE ID的分组及译码该分组以接收用户数据。
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。此种多重传输使用大量的无线电资源，其为不希望的。
因此，希望具一种弹性机制以提供点对多点服务。
发明内容
服务数据是在无线通信系统被传输，第一服务标识传输以由在该系统小区的一组用户接收，该组用户不包括小区的所有用户。该组用户的每一个接收该服务标识。该组用户的每一个监测在高速下行共享信道(HS-DSCH)传送的第二服务标识。该服务数据是以第二服务标识在该HS-DSCH传送。该组用户的每一个侦测第二服务标识及接收该HS-DSCH的服务数据。
附图说明
图1为点对多点服务的说明。
图2为较佳的HS-DSCH及相关控制信道的说明。
图3为较佳的B节点及用户设备的简化图式。
图4为具较佳的HS-DSCH的调度机制的较佳B节点的简化图式。
图5A及5B为HS-DSCH的较佳HS-DSCH信号的说明。
图6为建立及传输在HS-DSCH上点对多点服务的较佳信号的说明。
图7为藉由无线电网络控制器及用户设备执行的在HS-DSCH上点对多点服务的信道映射的说明。
具体实施方式
虽然该较佳具体实施例是以较佳的3GPP提出系统叙述，它们可与其它使用点对多点传输的无线电系统一起被使用。
图2为较佳的HS-DSCH 16及其附属下行控制信道13以用于传输点对多点(PtM)服务的说明。在图2中，一组用户UE 1 121、...、UE J 12J、...、UE N 12N要接收在该HS-DSCH 16的服务。一种下行公共控制信道(CCC)13被用来分配该HS-DSCH 16给用户UE 1 121、...、UE J 12J、...、UE N12N。该HS-DSCH 16由基站10送出且由UEs 121-12N群接收。UEs如未登录此服务的UE×12X不符合在CCC 13上的服务识别码。因此，此UE，UE×12X，未被配置为接收该HS-DSCH 16的数据。
图3为B节点18及UEs的其中一个，UE J 12J，以用于在该HS-DSCH16的传送数据的简化图式。在B节点18，一种下行控制信道产生器24产生每一个U E 121-12N的CCC信号。对UE J 12J，在该CCC 13由天线32或天线阵列经由无线射频接口22射出后，此信号由U E J 12J的天线34或天线阵列接收且由CCC接收器36处理以回复信道的控制数据，如该HS-DSCH 16的调制及编码组。
一种HS-DSCH产生器26产生该HS-DSCH信号以经由该无线接口22传送。该HS-DSCH信号是使用其天线34或天线阵列而由UE J 12J接收。该HS-DSCH 16的数据藉由一种HS-DSCH接收器38使用该CCC数据而被回复，一种信道品质测量装置40拾取该HS-DSCH的信道品质测量/数据，如信噪比(SIR)或块错误率(BLER)。信道品质亦可由该下行附属专属信道而得到。该测量/数据藉由上行物理控制信道(CCC)传送器，或藉由层3发信信号步骤而传送至该B节点18。
此外，一种在用户设备12的自动回复请求(ARQ)传送器41传送确认应答(ACKs)及否定ACKs(NAKs)，其显示该HS-DSCH数据是否已成功接收。一种在B节点18的ARQ接收器31接收该ACK及NAKs，若一个NAK由该HS-DSCH传输用户的任一个接收，则一般上该HS-DSCH传输被重复，该B节点18为所有用户检查该ACKs/NAKs。典型上，若任何用户传送NAK，则重新传输被进行。然而，若仅有一些超过定限的NAKs，则重新传输仅会被促使。典型上，对重新传输的时间限制被设定，较佳为，该UEs 12 ACKing忽略后续重新传输，节省其功率。
一种在该B节点18的信道品质测量处理器30自所有该HS-DSCH的用户回复该信道品质测量/数据。一种调制及编码组(MCS)选择装置28使用自每一个已登录以接收该PtM服务(用户群)的用户的该信道测量/数据以选择该HS-DSCH传输的MCS。较佳为所选择的MCS为最不稳健性(最高数据速度)使信道条件允许具最差的已接收经测量HS-DSCH信号品质的在此PtM用户群的用户可进行工作。虽然可使用更长时间范围，较佳为该MCS在每个传输时间间隔(TTI)被更新。该CCC产生器24产生该CCC，其显示至UE 1 121、...、UE J 12J、...、UE N 12N的已选择MCS以进行该HS-DSCH的适当接收。该HS-DSCH产生器26使用已选择的MCS产生该HS-DSCH 16。
对具多重子数据流的服务，各种子数据流的传输特性可被个别处理。为说明用途，多媒体服务可具音声、影像及文本子数据流。每一个子数据流的QOS可为不同使得不同传输属性可由每一个子数据流使用。此方法可得到更佳的资源效率，每一个子数据流可被个别处理而非传输每一个子数据流以符合最高的QOS子数据流要求。对每一个子数据流，该块错误率(BLER)与BLER品质目标被比较。
图4为B节点18的较佳调度机制的简化方块图式。该调度机制46较佳为被用来调度每一个TTI的数据，虽然可使用较长的调度时间。该调度机制46接收要在该HS-DSCH传输的点对点(PtP)及PtM数据。该调度程序决定在下一个TTI那一个用户接收PtP传输及那一个用户群接收PtM传输。
在较佳时间期间调度数据传输可得到更有效的音声资源利用。为说明用途，在特定TTI，少量数据可用于专属PtP传输，因在该TTI上音声资源的增加可提供性，该调度机制46可增加经由该HS-DSCH信道传输的PtM数据量。同样地，当PtM数据未被提供时，该调度程序46可选择传输PtP服务。另一个调度标准为QoS属性，如传输延迟及/或PtP或PtM服务的数据产量要求。基于TTI基准的调度提供达到这些要求同时维持HS-DSCH小区资源的高利用率的更大能力。
该调度程序46亦可考虑物理传输要求。例如，一个用户或用户群会要求较另一个更为稳健性的MCS。在下一个TTI期间，资源可能仅提供给较少稳健性MCS，的后，该调度程序46再调度PtP用户或PtM用户群的传输以最大化提供资源的使用。因提供用于传输的数据具特定QOS要求，提供的物理资源及信道品质测量基于TTI基准变化，在此间隔内调度的能力改良满意用户的数目及物理资源的整体利用及有效使用。
该调度程序46亦自在PtM用户群的所有用户得到ACK/NAK反馈及调度重新传输直到所有用户藉由传送ACK显示传输的成功接收，或某定限被达到，或是服务传输时间限制达到或是重新传输限制达到。此方法的优点为仅错误的PtM服务的部份被重新传输，而非重新传输整个服务传输。较佳为，先前产生ACK的用户忽略任何重新传输。
此方法的优点为基于TTI基准在PtP及PtM服务间动态地调度的能力而非以层3步骤调度S-CCPCH，层3步骤需要100多毫秒至数秒大小以进行信道分配，此提供改良QOS及物理资源管理。此外，其允许UE接收多重服务而不需具同时信道接收的容量，因重叠的实体分配可被避免，此多重服务可由时间分开。
B节点18在该CCC 13发信信号至该UEs 121-12N，信道配置为UE121-12N数据可被传送。藉由最大化无线电资源的使用，每一个TTI的较佳调度减少在服务间的资源冲突，此信道的分配经由该下行CCC使用发信装置48送信号至用户。若无该机制46，一般，信道无法在TTI上被重新分配且结果为维持QOS及物理资源的高利用及有效使用的能力被限制。
图5A及5B为该HS-DSCH 16的较佳HS-DSCH发信的说明。在图5A，藉由侦测伴随所有服务用户的PtM服务ID 51，PtM用户群的每一个UE121-12N被告知服务传送。该服务ID 51是在该下行公共控制信道13被编码。在预先决定时间期间后，用户接收该经授权服务的HS-DSCH。
在图5B，藉由侦测伴随UEs，UE群ID 1 531至UE群ID N 53N的ID，每一个UE 121-12N被告知服务传送，其是编码在该下行公共控制信道13。在预先决定时间期间后，用户接收由该CCC 13显示的该HS-DSCH 16以得到具经授权服务的服务ID的分组。
图6为建立及传送在HS-DSCHs上点对多点服务的较佳信号的说明。该RAN 70发信信号至每一个用户以接收该传输74的输送属性的服务。每一个用户配置其本身以接收该传输及监看该CCC的PtM服务ID群，72。传送用做点对多点服务的数据藉由UMTS无线电存取网络(UTRAN)70自核心网络接收。在该CCC上的服务/群/UE ID显示在订定时间期间后，该HS-DSCH传输会很快发生在特定HS-DSCH物理信道，在接收该CCC后，每一个用户配置其本身以接收该HS-DSCH传输。
每一个用户可以层3发信信号步骤送出信道品质数据给该RAN 70，76。该信道数据的传送亦可藉由物理层发信信号，以TTI为基准报告，78。使用在每一个PtM用户群的所有用户的该信道品质数据，该RAN 70决定至每一个PtM用户群的HS-DSCH传输的合适MCS。为说明用途，该RAN 70一般会设定该MCS在由具最差接收品质的用户可于所欲QOS接收的一种位准。为最适化无线电资源的使用，虽然在更新间可使用更长时间范围，较佳为这些参数在每个时间传送间隔(TTI)被更新。
该UTRAN 70同时进行该HS-DSCH分配，82，且每一个UE 12配置该HS-DSCH接收，84。服务数据在该HS-DSCH上传送，86。在该HS-DSCH上传送的服务数据由该UE 12接收。鉴定后，该服务数据被向前送至公共通信信道，较佳结构允许在共享或专属信道如PtM或PtP传输上转移公共通信信道数据的弹性。此映射在无线接口的传输侧及接收侧上皆执行。
图7为在无线电网络控制器19及UE 12比值下的较佳信道映射的说明。PtM数据到达在公共通信信道(CTCH)的RNC，该CTCH映射在该HS-DSCH上以在该物理信道(HS-PDSCH)上传送至用户。一个UE 12于此处被说明且一般多重UEs接收该HS-DSCH传输。UE 12接收该HS-PDSCH及映射该HS-DSCH至该CTCH以由该UE 12处理。

Claims (12)

1.一种B节点，其包括：
上行控制信道接收器，用于从高速共享信道的多个用户接收块错误率数据；
调制及编码组选择装置，通过使用该已接收的块错误率数据而选择一高速共享信道传输的一调制及编码组；
高速共享信道产生器，用于产生在已选择的调制及编码组及服务识别码下的该高速共享信道传输信号的数据；
下行公共控制信道产生器，用于产生具一服务标识的一公共控制信道信号；及
天线阵列，用于传送该高速共享信道传输信号及该下行公共控制信道。
2.一种B节点，其包括：
输入，其被配置以接收点对点(PtP)及点对多点(PtM)数据；
调度机制，以接收该已接收的数据及调度该传输数据而做为PtP及PtM传输，该PtM传输是经由一种高速共享信道而同时传输数据至多重用户；及
发信装置，以发送该数据调度至用户。
3.如权利要求2所述的B节点，其中该调度是基于一数据延迟及该已接收数据的数据产量要求。
4.如权利要求2所述的B节点，其中该调度是在一传输时间间隔基准上执行。
5.如权利要求2所述的B节点，其中该调度是基于该PtP及PtM传输的一稳健性。
6.如权利要求2所述的B节点，其中该PtM数据的重新传输的调度是基于意欲接收该PtM数据的所有用户的已接收确认应答及否定应答。
7.一种在一无线通信系统传输服务数据的方法，该方法包括：
接收一公共通信信道的数据以在无线接口上传送；
映射该公共通信信道一共享信道；
经由该无线接口在该共享信道上传送该公共通信信道数据；
在经由该无线接口于该共享信道中的传送后，接收该公共通信信道数据；
向前传送该已接收的共享信道数据至一公共通信信道。
8.如权利要求7所述的方法，其中该映射包括映射该公共通信信道至一共享传输信道。
9.如权利要求7所述的方法，其更包括选择一公共信道或一共享信道以映射该公共通信信道至其上。
10.如权利要求7所述的方法，其更包括选择一公共信道、一共享信道或一专属信道以映射该公共通信信道于其上。
11.如权利要求7所述的方法，其中该无线通信系统为一3GPP通信系统。
12.如权利要求7所述的方法，其中该共享信道为高速下行共享信道。
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