CN101584129B - 反向链路功率控制 - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
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- H04W52/10—Open loop power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
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- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
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Abstract
在一个实施例中,根据第一路径损耗和第二路径损耗确定(S90)用户设备的反向链路发射功率。所述第一路径损耗是服务站与所述用户设备之间的路径损耗,所述服务站为所述用户设备的通信需求提供服务。所述第二路径损耗是相邻站与所述用户设备之间的路径损耗,所述相邻站与所述服务站相邻。
Description
技术领域
本发明的实例实施例一般地涉及无线通信网络中的反向链路功率控制。
背景技术
蜂窝通信网络典型地包括由无线或有线连接耦合并且通过不同类型的通信信道访问的各种通信节点。每个通信节点都包括处理通过通信信道发送和接收的数据的协议栈。根据通信系统的类型,各个通信节点的运行和配置可以不同并且经常被冠以不同的名称。此类通信系统例如包括码分多址2000(CDMA2000)和通用移动通信系统(UMTS)。
UMTS是描述了一组协议标准的无线数据通信和电话标准。UMTS提出了在基站(BS)或节点B与移动或用户设备(UE)之间传输语音和数据的协议标准。UMTS系统典型地包括多个无线电网络控制器(RNC)。UMTS网络中的RNC提供与GSM/GPRS网络中的基站控制器(BSC)功能等同的功能。但是,RNC可以具有其他能力,例如包括自主地管理切换而不涉及移动交换中心(MSC)和服务通用分组无线服务(GPRS)支持节点(SGSN)。节点B负责空中接口处理和某些无线电资源管理功能。UMTS网络中的节点B提供与GSM/GPRS网络中的基站收发台(BTS)等同的功能。节点B典型地在物理上与现有GSM基站收发台(BTS)位于一起以降低UMTS方案的成本并最小化规划同意限制。
图1示出了根据UMTS协议运行的常规通信系统100。参考图1,通信系统100可以包括多个节点B,如节点B 120、122和124,每个节点都在其各自的覆盖区内为诸如UE 105和110的UE的通信需求服务。节点B可以为称为小区的覆盖区服务,并且小区可以被分成多个扇区。为了便于说明,术语小区可以指由节点B服务的整个覆盖区或指节点B的单个扇区。从节点B到UE的通信被称为前向链路或下行链路。从UE到节点B的通信被称为反向链路或上行链路。
节点B连接到诸如RNC 130和132的RNC,并且RNC连接到MSC/SGSN 140。RNC处理某些呼叫和数据处理功能,例如,如上所述的自主地管理切换而不涉及MSC和SGSN。MSC/SGSN 140处理到网络中的其他元素(例如,RNC 130/132和节点B 120/122/124)或到外部网络的路由呼叫和/或数据。图1中还示出了这些元素之间的常规接口Uu、Iub、Iur和Iu。
已提出了部分功率控制方案以便控制3GPP LTE标准的反向链路上的移动或UE发射功率。此开环部分功率控制技术提出设置UE发射功率频谱密度,从而可以补偿路径损耗(包括遮蔽)的一部分。即,可以如下建立UE发射功率频谱密度TxPSD_dBm:
TxPSD_dBm=min(Max_TxPSD_dBm,Target_SINR_dB+PathLoss_dB+UL_interference_dBm) (1)
Max_TxPSD_dBm是最大UE发射功率频谱密度(每音调的功率),其是UE功率等级和分配的发射带宽的函数(例如,分配了12个副载波的单个资源单位的21dBm UE功率等级将具有10.21dBm的每音调的最大发射功率);
UL_interference_dBm是由为UE服务的节点B测量的反向或上行链路干扰(典型地,此节点B将其确定为总的接收能量减去从节点B所服务的UE接收的能量)并且其例如通过控制信道被报告给UE;
PathLoss_dB是节点B与UE之间的路径损耗;以及
Target_SINR_dB是每个音调的每天线的目标信噪比(SINR)。文献中可用的部分功率控制方案将目标SINR设置为到服务小区的路径损耗的函数,其如以下所示:
Target_SINR_dB=A+(B-1)*(PathLoss_dB) (2)
其中A和B是设计参数。忽略(1)中的Max_TxPSD_dBm限制,UE发射功率频谱密度由下式给出:
TxPSD_dBm=A+B*PathLoss_dB+UL_interference_dBm (3)
注意,如果B=0,则不存在对路径损耗的补偿并且所有UE都以相同的发射功率频谱密度(可能是最大功率)进行发射,这导致较高的干扰水平和较差的小区边缘性能。如果B=1,则这是传统的慢速功率控制,其中完全补偿路径损耗并且以相同的SINR接收所有UE。这导致较差的频谱效率。通过设置0<B<1,仅补偿路径损耗的一部分,这在平衡频谱效率和小区边缘性能中提供了灵活性。
发明内容
上述开环部分功率控制的至少一个问题是其未直接考虑UE将对相邻小区/扇区产生的干扰量。本发明的至少一个实施例利用UE将对其相邻小区/扇区产生的干扰水平来确定该UE的发射功率频谱密度。此外,优点包括允许干扰分布中的较小变化、较高的吞吐量等。
在一个实施例中,根据第一路径损耗和第二路径损耗确定用户设备的反向链路发射功率。所述第一路径损耗是服务站与所述用户设备之间的路径损耗,所述服务站为所述用户设备的通信需求提供服务。所述第二路径损耗是相邻站与所述用户设备之间的路径损耗,所述相邻站与所述服务站相邻。
在另一个实施例中,用户设备测量从服务站接收的下行链路功率。所述服务站为所述用户设备的通信需求服务。所述用户设备还测量从相邻站接收的下行链路功率。所述相邻站与所述服务站相邻。所述用户设备根据所测量的从所述服务站接收的下行链路功率和所测量的从所述相邻站接收的下行链路功率来确定反向链路发射功率。
附图说明
从以下给出的详细描述和仅通过例示给出的附图,可以更完整地理解本发明,其中相同的标号指定各个图中对应的部件,这些附图是:
图1示出了根据UMTS协议运行的常规通信系统100;
图2示出了其中UE可能导致相邻小区中的干扰的实例:
图3示出了第一和第二组实例截听参数和公平性参数的目标SINR对路径损耗的图;
图4示出了根据本发明实施例的UE确定发射功率频谱密度时执行的处理的流程图;以及
图5示出了针对下表1中列出的假设的功率控制方案的性能,其呈现为小区边缘速率(定义为5%CDF用户吞吐量)对平均小区吞吐量。
具体实施方式
将根据图1所示的UMTS系统描述本发明的实例实施例。但是,可以理解,本发明并不限于此系统或不限于UMTS系统。
如上所述,开环部分功率控制的一个问题是其未直接考虑UE将对相邻小区/扇区产生的干扰量。例如,图2示出了其中UE可能导致相邻小区/扇区(以下总称为小区)中的干扰的实例。在图2中,UE T1由节点B 1提供服务并且产生对节点B 2的干扰。但是,如果UE T1对节点B 2具有较强的阴影衰减,则与UE T1对节点B 2具有较小的阴影衰减的情况相比,UE T1应被允许以较高的发射功率频谱密度进行发射。另一个实例是非相同部署的情况,其中节点B 2具有大得多的小区半径,在此情况下,应允许UE T1以较高的功率水平进行发射。
根据一个实施例,开环部分功率控制方法可以被修改为如下:目标SINR可以被设置为服务小区/服务节点B与最强的相邻小区/相邻节点B之间的路径损耗差的函数。例如,一个实施例将此修改后的目标SINR(即,Modified_Target_SINR_dB)确定为如下:
Modified_Target_SINR_dB=min(A+B*(PathLoss_Diff_dB),Max_Target_SINR_dB) (4)
其中PathLoss_Diff_dB是最强的相邻节点B和当前的服务节点B之间的路径损耗(包括遮蔽)的差。可以通过如下确定接收的下行链路导频功率测量的比率来容易地得到此测量:
PathLoss_Diff_dB=10*log10(DL_Rx_PilotPower_ServingCell/DL_Rx_PilotPower_StrongestNeighborCell) (5)
其中DL_Rx_PilotPower_ServingCell是从服务节点B接收的下行链路导频功率,并且DL_Rx_PilotPower_StrongestNeighborCell是从最强相邻节点B接收的下行链路导频功率。括号中的量简单地称为下行链路导频功率比(PPR)。在等式(4)中,截听参数A指定“小区边缘”(即,当PathLoss_Diff_dB=0时)处的目标SINR。正斜率参数B指定在UE朝向小区内部移动时目标SINR多快地增加,并且因此控制功率控制方案的公平性。Max_Target_SINR_dB是最大允许目标SINR。
图3示出了第一和第二组实例截听参数A和公平性参数B的目标SINR对路径损耗的图。具体地说,图3是随服务小区与最强非服务小区之间的路径损耗差的增大(即,在UE朝向小区内部移动时)而增大的目标SINR的图示。图3包括当截听参数为-5并且公平性参数为0.5时由菱形表示的第一曲线以及当截听参数为-5并且公平性参数为0.7时由正方形表示的第二曲线。如图所示,对于高等几何用户来说,公平性参数B的较大的值在增大目标SINR方面更加迅速。
图4示出了UE确定发射功率频谱密度水平(其在此也称为反向链路功率)时执行的处理的流程图。如图所示,在步骤S10,UE测量从当前服务站(例如,当前正在处理UE的通信需求的节点B)接收的下行链路导频功率。这时常表述为测量从服务扇区或小区接收的下行链路导频功率。可以在每隔100毫秒到200毫秒的量级执行此测量并且在此间隔上计算接收的导频功率的平均值,以便平均快速衰减的影响。然后,在步骤S20,UE测量从其接收范围内的任何其他相邻站(例如,覆盖区(小区或扇区)与服务节点B相邻的节点B)接收的下行链路导频功率。这时常表述为测量从相邻扇区或小区接收的下行链路导频功率。可以在每隔100毫秒到200毫秒的量级执行此测量并且在此间隔上计算接收的导频功率的平均值,以便平均快速衰减的影响。
在步骤S30,UE确定是否在步骤S20中检测到任何相邻站。如果否,则在步骤S40,UE将修改后的目标SINR设置为最大允许值(参见步骤S70)。但是,如果在步骤S20中检测到相邻站,则UE在步骤S50中将最强的非服务邻居确定为具有步骤S20中检测到的最高接收的下行链路导频功率的邻居。在步骤S60,UE将导频功率比计算为从服务扇区接收的下行链路导频功率除以从最强非服务扇区接收的下行链路导频功率。然后,UE将路径损耗差(以dB为标度)计算为PathLoss_Diff_dB=10*log10(PPR)。
服务站在广播信道上广播部分功率控制参数A、B、上行链路干扰,以及Max_Target_SINR_dB,使得由此站提供服务的所有UE都可以解码所述参数。相应地,在步骤S70,UE获得这些值。但是,将理解的是,获得这些值可以发生在所述处理之前或与所述处理的任何步骤同时发生。
然后,在步骤S80,UE根据表达式(5)计算修改后的目标SINR。
在步骤S40或S80之后,UE在步骤S90中使用以下表达式(6)中所示的修改后的目标SINR根据表达式(1)来确定发射功率频谱密度:
Tx_PSD_dBm=min(Max_Tx_PSD_dBm,Modified_Target_SINR_dB+PathLoss_dB+UL_Interference_dBm) (6)
其中PathLoss_dB是表达式(1)中的到服务站的测量的路径损耗。
使用下表1中列出的系统仿真假设,仿真了仅使用路径损耗(如等式1)和使用导频功率比测量(如等式6)的部分功率控制的性能。对于部分功率控制方案,选择B的一系列值以例示小区吞吐量与小区边缘速率之间的权衡。对于B的每个值,选择A以便获得4.5dB的中间IoT(热噪声功率上的干扰功率)工作点。在实际中,可以由反向链路控制信道的链路预算要求控制期望的IoT工作点。在两种部分功率控制情况中,都使用25dB的最大目标SINR。
表1:系统仿真假设
图5示出了针对表1中列出的假设的功率控制方案的性能,其呈现为小区边缘速率(定义为5%CDF用户吞吐量)对平均小区吞吐量。注意,与仅使用到服务小区的路径损耗的情况相比,通过利用从服务小区到最强相邻小区的路径损耗的差,显著提高了部分功率控制的性能。也就是说,对于给定的小区边缘速率,可以获得更高的小区吞吐量;或者对于给定的小区吞吐量,可以获得更高的小区边缘速率。
与单独使用来自服务小区的路径损耗相比,使用服务小区与最强相邻小区之间的路径损耗差的开环部分功率控制显著提高了性能。
已如上描述了本发明,将显而易见的是,可以在许多方面改变本发明。例如,参数A和B可以是固定的、由系统操作员设置、由系统操作员更新,适于基于诸如负载、一天中的时间之类的因素而改变。此类变化不应被视为偏离本发明,并且所有此类修改都旨在被包括在本发明的范围之内。
Claims (7)
1.一种反向链路功率控制的方法,包括:
根据第一路径损耗和第二路径损耗之间的差确定(S90)用户设备的反向链路发射功率,所述第一路径损耗是服务站与所述用户设备之间的路径损耗,所述服务站为所述用户设备的通信需求提供服务,并且所述第二路径损耗是相邻站与所述用户设备之间的路径损耗,所述相邻站与所述服务站相邻,所述差根据从所述服务站接收的下行链路功率和从所述相邻站接收的下行链路功率的比率而确定;以及
根据确定的路径损耗差确定所述用户设备的目标信噪比SINR,
其中确定目标SINR的步骤根据所确定的路径损耗差、第一参数以及第二参数来确定所述目标SINR,所述第一参数指定了所述服务站的覆盖区边缘处的期望目标SINR,并且所述第二参数指定了在所述用户设备朝向所述覆盖区的内部移动时所述目标SINR多快地增加。
2.根据权利要求1的方法,还包括:
测量(S20)从多个相邻站接收的下行链路功率;
确定(S50)所述多个相邻站中具有最大接收的下行链路功率的一个相邻站;并且其中
所述第二路径损耗处于具有最大接收的下行链路功率的相邻站与所述用户设备之间。
3.根据权利要求1的方法,其中所述相邻站是在所述用户设备处具有最大接收的下行链路功率的相邻站。
4.根据权利要求1的方法,其中:
确定反向链路发射功率的步骤根据所确定的目标SINR来确定所述反向链路发射功率。
5.根据权利要求1的方法,其中确定目标SINR的步骤按照以下方式确定所述目标SINR:
目标SINR=min(A+B*(PathLoss_Diff),Max_Target_SINR)
其中所述PathLoss_Diff是所述路径损耗差,A是所述第一参数,B是所述第二参数,并且Max_Target_SINR是最大目标SINR。
6.根据权利要求5的方法,其中确定反向链路发射功率的步骤按照以下方式来确定所述反向链路发射功率:
反向链路发射功率=min(最大发射功率,目标SINR+第一路径损耗+UL_Interference)
其中所述UL_Interference是所述服务站处的上行链路干扰。
7.根据权利要求4的方法,其中确定反向链路发射功率的步骤根据所述路径损耗差和所述服务站处的上行链路干扰来确定所述反向链路发射功率。
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US11/650,984 | 2007-01-09 | ||
US11/650,984 US7917164B2 (en) | 2007-01-09 | 2007-01-09 | Reverse link power control |
PCT/US2008/000188 WO2008085936A2 (en) | 2007-01-09 | 2008-01-07 | Reverse link power control |
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JP5281017B2 (ja) | 2013-09-04 |
US7917164B2 (en) | 2011-03-29 |
EP2102996B1 (en) | 2013-11-27 |
EP2102996A2 (en) | 2009-09-23 |
JP2010516184A (ja) | 2010-05-13 |
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