CN100468984C - 链路不平衡期间的外环上行链路功率控制 - Google Patents

链路不平衡期间的外环上行链路功率控制 Download PDF

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CN100468984C
CN100468984C CNB038140128A CN03814012A CN100468984C CN 100468984 C CN100468984 C CN 100468984C CN B038140128 A CNB038140128 A CN B038140128A CN 03814012 A CN03814012 A CN 03814012A CN 100468984 C CN100468984 C CN 100468984C
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D·P·马拉迪
S·维伦尼格
T·陈
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Abstract

提供了上行链路功率控制以便在UE进入SHO时维持上行链路HS-DPCCH的完整性。通过在决定增加或降低节点B的目标导频SNR阈值时，考虑服务节点B的导频信号的平均SNR和/或服务节点B的全部上行链路数据信道上的平均块差错率，而控制目标导频SNR阈值。

Description

链路不平衡期间的外环上行链路功率控制
发明背景
技术领域
本发明一般涉及无线通信领域，尤其涉及上行链路功率控制。尽管本发明有广泛的应用，但它尤其适用于蜂窝通信***中，并且将结合蜂窝通信***进行描述。
相关技术描述
技术规范3GPP TS25.211v5.0.0(2002-03)、第三代合伙人计划(3GPP)；技术规范群组无线接入网络；物理信道以及传输信道到物理信道上的映射(FDD)(第5版)提供了一高速下行链路共享信道(HS-DSCH)。HS-DSCH是由一个或几个用户设备(UE)共享的下行链路传输信道。
在3GPP高速数据分组接入(HSDPA)中，对于下行链路上的专用物理信道(DPCH)，UE会在与多个节点B的软切换(SHO)中。然而，对于高速下行链路共享信道(HS-DSCH)和相应的上行链路高速专用物理控制信道(HS-DPCCH)没有HSDPA SHO。这会导致称为链路不平衡的情况。也就是，通过HS-DSCH服务高速数据的节点B与UE对DPCCH有最佳链路的节点B不同。
因此需要一种在链路不平衡期间用于上行链路功率控制的装置和方法，其考虑到反向链路HS-DPCH。
附图说明
本发明的其它特征和优点将在下面的描述和附图中部分提出，其中描述并示出了本发明的优选实施例，在本领域的技术人员结合附图查阅了下列详细描述后，所述特征和优点也变得显而易见，或者可以通过实践本发明而得知。本发明的优点可以通过在所附权利要求中特别指出的仪器和组合来实现。
图1是按照本发明配置的通信***的一般框图。
具体实施方式
图1说明了通信***100的一般框图。用户设备(UE)102会与节点B1 104和节点B2 106进行无线通信。UE可以是诸如蜂窝电话或其它固定或移动的无线设备这样的设备。节点B会是诸如服务整个小区的蜂窝基站这样的设备。
节点B1 104和节点B2 106会与无线网络控制器(RNC)108进行通信。RNC从节点B1和节点B2接收信号并且将控制信息等等提供给节点B1和节点B2。
UE 102会处在节点B1 104和节点B2 106的覆盖区域内，并且会通过各个信道与节点B1和节点B2通信。例如，节点B会通过下行链路信道将信号传送到UE，所述下行链路信道比如在图1中被标记为专用物理数据信道(DPDCH)和专用物理控制信道(DPCCH)这样的下行链路专用物理信道(DPCH)、以及高速下行链路共享信道(HS-DSCH)。UE会通过上行链路信道将信号发送到节点B，所述上行链路信道比如上行链路DPDCH、上行链路DPCCH、以及与下行链路HS-DSCH相关的高速专用物理控制信道(HS-DPCCH)。
除了用于下行链路功率控制的反馈信息比特(FBI)和UP/DOWN(增加/降低)请求信号以外，UE 102会通过上行链路DPCCH发送由数据块组成的全向导频信号。
UE的导频信号会被导频信号范围内的节点B所接收。每个节点B都有一个目标导频信噪比(SNR)阈值T，希望在所述阈值T处从UE接收导频信号。每个接收导频信号的节点B都能计算接收到的导频信号的SNR。(块110和112)。如果所计算的SNR低于阈值T，则通过在DPCCH上发送一UP请求，节点B能请求UE增加导频信号的发送功率。(块114和116)。如果所计算的SNR高于阈值T，则通过在DPCCH上发送一DOWN请求，节点B能请求UE降低导频信号的发送功率。(块118和120)。
对几个DOWN取或确定了是增加还是降低导频信号强度。如果UE从任一节点B接收一DOWN请求，则降低UE的导频强度。如果UE从全部节点B接收UP请求，则增加UE的导频强度。
链路不平衡会在UE 102通过信道HS-DSCH从节点B1接收高速数据时出现，并且与节点B1和节点B2处在上行链路SHO状态。这个链路不平衡情况会在节点B2正在发送DOWN请求而节点B1正在发送UP请求时出现。此外，UE处于SHO状态下时会按照常规的对几个DOWN取或来改变其发送功率。
由于HS-DPCCH的信号强度会按照UE内保存的话务对导频比与导频信号强度的减少成比例减少，因此UE 102降低导频信号发送功率会影响UE和节点B1 104之间的上行链路高速通信。
在HSDPA中，节点B1会通过HS-DSCH向UE 102发送分组数据。UE通过HS-DSCH一次仅能从一个节点B接收分组数据。在图1中，节点B1 104是正在向UE发送分组数据的节点。会出现小区切换，所述小区切换将UE从接收来自节点B1的分组数据切换到通过与节点B2(未示出)相关的下行链路信道HS-DSCH而接收来自节点B2106的分组数据。较高层的信令实现了小区切换。然而，链路不平衡会在比小区切换短的时标上存在。
UE 102会通过HS-DPCCH发送确认/不确认(ACK/NAK)信号。如果UE已经通过HS-DSCH成功地从服务节点B1接收到分组数据，则UE发送一ACK。相反，如果UE通过HS-DSCH不成功地从服务节点B1接收到分组数据，则UE发送一NAK。如果NAK被正在发送的节点B1所接收，正在发送的节点B1会重发前面发送的分组数据。如果UE丢失了与HS-DSCH相关的高速共享控制信道(HS-SCCH)，则UE就不发送任何东西(空)。HS-SCCH向UE表明在HS-DSCH上将来的传输即将到来。
在链路不平衡情况下，节点B2发送一DOWN请求。这使UE 102降低导频信号强度，并且相应地降低ACK/NAK的信号强度。ACK/NAK的降低了的强度会导致ACK被接收作为NAK，导致HS-DSCH上增加的传输；还会导致NAK或空被接收作为ACK，导致HS-DSCH上丢失的分组。
而且，由于UE通过HS-DPCCH发送信道质量指示(CQI)，因此节点B1会接收错误的指示。
对这个问题的解决方案是使RNC 108监视导频强度，所述导频强度例如，节点B1 104所接收到的导频信号的平均SNR(块122)以及服务节点B1的平均块差错率(BLER)(块124)。这些参数可用于确定是增加还是降低目标导频SNR阈值T。
RNC 108能计算通过两个节点B的上行链路DPCH发送的数据块的循环冗余校验(块126和128)。如果CRC对于两个信道都失败(块130)，RNC就指示节点B增加目标导频SNR阈值T(块132)。这又可能使节点B2将其请求从DOWN改变为UP。
如果CRC对于两个信道都不失败(块130)，则RNC 108确定正在发送高速分组数据的节点B1 104和UE 102之间的上行链路信道条件是否不令人满意(块134)，例如，确定平均导频信号SNR是否小于预定的阈值TH1，或者DPDCH上的块差错率(BLER)是否大于预定的阈值TH2，或其两者。如果上行链路信道条件是令人满意的，RNC 108就请求降低节点B的目标导频SNR阈值T(块136)。
如果正在发送高速数据分组的节点B1 104和UE 102之间的上行链路信道条件是不令人满意的(块134)，RNC 108就请求增加目标导频SNR阈值T(块138)。增加了的T使节点B2更可能将其DOWN请求改变为UP请求，这又防止UE导频强度按照多个DOWN取或而降低。
任选地，除了增加T(块138)以外，RNC会请求减小节点B的话务对导频比(块140)。减小话务对导频比通过减小与导频信号强度有关的话务信道强度而减小了平均反向链路干扰。
本发明能有其它且不同的实施例，其几个细节能被修改。例如，尽管参照上述宽带码分多址(W-CDMA)的技术规范描述了本发明，然而本发明可等价地应用于CDMA2000 1xEV-DV。例如，下列3GPP术语对应于CDMA2000术语：UE对应于移动站(MS)；RNC对应于基站控制器(BSC)；HS-DSCH对应于前向分组数据信道(F-PDCH)；DPCH对应于基本信道/专用控制信道(FCH/DCCH)；HS-DPCCH对应于R-CQICH和R-ACKCH；以及BLER对应于帧差错率(FER)。
节点B会是具有波束成形天线的蜂窝基站，所述蜂窝基站服务一个小区的各个扇区。在该情况下，对于同一基站的扇区间的链路不平衡，可以在服务UE的基站内执行RNC的功能。
这里描述的图1所示模块的功能可以用专用硬件实现，或等价地用软件和处理器来实现。
总之，这里描述的上行链路功率控制提供了在UE进入SHO时维持上行链路HS-DPCCH的完整性的优点。这主要通过控制目标导频SNR阈值来完成，所述控制这样实现：通过在决定增加或降低节点B的目标导频SNR阈值时考虑服务节点B1的导频信号强度和/或服务节点B1的上行链路信道条件。
本领域的技术人员会认识到，可以对本发明的功率控制技术、构造和操作作出其它修改和变化，这不背离本发明的范围和精神。

Claims (13)

1.一种用于上行链路功率控制的装置，包括：
用于确定上行链路信道的信道条件的确定模块；以及
用于在所确定的信道条件不令人满意时增加目标导频SNR阈值的目标导频信噪比(SNR)阈值调节器，其中，在导频信号的平均SNR低于预定的第一阈值时，或者，在上行链路数据信道上的平均块差错率大于预定的第二阈值时，所确定的信道条件是不令人满意的。
2.如权利要求1所述的装置，其特征在于还包括一话务对导频比调节器，其用于在增加目标导频SNR阈值时减小话务对导频比。
3.如权利要求1所述的装置，其特征在于，所述目标导频信噪比(SNR)阈值调节器在所确定的信道条件令人满意时降低目标导频SNR阈值。
4.如权利要求1所述的装置，其特征在于，在导频信号的平均SNR小于预定的第一阈值且上行链路数据信道上的平均块差错率大于预定的第二阈值时，所确定的信道条件是不令人满意的。
5.一种用于上行链路功率控制的装置，包括：
用于计算平均信噪比或上行链路导频信号的信噪比SNR平均器；
用于计算平均块差错率或上行链路数据信号的块差错率BLER平均器；
用于根据导频信号的平均SNR是否低于预定的第一阈值或者上行链路数据信道上的平均块差错率是否大于预定的第二阈值来确定上行链路信道的信道条件是令人满意还是不令人满意的确定模块；以及
用于所确定的信道条件不令人满意时增加目标导频SNR阈值并用于在所确定的信道条件令人满意时降低目标导频SNR阈值的目标导频信噪比阈值调节器。
6.一种用于上行链路功率控制的方法，包括：
确定上行链路的信道条件；以及
在所确定的信道条件不令人满意时增加目标导频SNR阈值，其中，在导频信号的平均SNR低于预定的第一阈值时，或者，在上行链路数据信道上的平均块差错率大于预定的第二阈值时，所确定的信道条件是不令人满意的。
7.如权利要求6所述的方法，其特征在于还包括在目标导频SNR阈值增加时减小话务对导频比。
8.如权利要求6所述的方法，其特征在于还包括在所确定的信道条件令人满意时降低目标导频SNR阈值。
9.一种用于上行链路功率控制的方法，包括：
计算平均SNR或上行链路导频信号；
计算平均BLER或上行链路数据信号；
根据导频信号的平均SNR是否低于预定的第一阈值或者上行链路数据信道上的平均块差错率是否大于预定的第二阈值来确定上行链路的信道条件是令人满意还是不令人满意；以及
在所确定的信道条件不令人满意时增加目标导频SNR阈值以及在所确定的信道条件令人满意时降低目标导频SNR阈值。
10.一种用于上行链路功率控制的装置，包括：
用于确定上行链路信道的信道条件的装置；以及
用于在所确定的信道条件不令人满意时增加目标导频SNR阈值的装置，其中，在导频信号的平均SNR低于预定的第一阈值时，或者，在上行链路数据信道上的平均块差错率大于预定的第二阈值时，所确定的信道条件是不令人满意的。
11.如权利要求10所述的装置，其特征在于还包括在目标导频SNR阈值降低时减小话务对导频比。
12.如权利要求10所述的装置，其特征在于还包括在所确定的信道条件令人满意时降低目标导频SNR阈值。
13.一种用于上行链路功率控制的装置，包括：
用于计算平均SNR或上行链路导频信号的装置；
用于计算平均BLER或上行链路数据信道的装置；
用于根据导频信号的平均SNR是否低于预定的第一阈值或者上行链路数据信道上的平均块差错率是否大于预定的第二阈值来确定上行链路信道的信道条件是令人满意还是不令人满意的装置；以及
用于在所确定的信道条件不令人满意时增加目标导频SNR阈值并且用于在所确定的信道条件令人满意时降低目标导频SNR阈值的装置。
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