CN1875553A - 非实时服务的初步下链传输功率调整 - Google Patents

非实时服务的初步下链传输功率调整 Download PDF

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CN1875553A
CN1875553A CNA200480032627XA CN200480032627A CN1875553A CN 1875553 A CN1875553 A CN 1875553A CN A200480032627X A CNA200480032627X A CN A200480032627XA CN 200480032627 A CN200480032627 A CN 200480032627A CN 1875553 A CN1875553 A CN 1875553A
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downlink transmit
initial downlink
carrier power
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张国栋
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InterDigital Technology Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/005—Control of transmission; Equalising
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
    • H04B7/2631—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] for broadband transmission
    • 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
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/343—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading taking into account loading or congestion level
    • 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
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transmitters (AREA)

Abstract

一种用来对一无线通信网络内的非实时服务进行初步下链传输功率调整的方法始于估计非实时服务的一初步下链传输功率电平。然后以估计的功率电平与一阈值做比较。判断该估计功率电平的一增加是否会影响相邻单元(cells)。倘若一增加不会影响相邻单元，则以一预定量调整该初步下链传输功率电平。

Description

非实时服务的初步下链传输功率调整
技术领域
本发明关于蜂巢式网络内的初步下链传输功率的调整，尤其涉及调整非实时服务的初步下链传输功率以增进该服务的感受品质。
背景技术
因为非实时(NRT)服务的突发性本质，用于NRT服务的物理资源的配置也是突发而短暂的。就每一种配置来说，初步下链传输功率的准确度对于此配置的服务的感受品质、譬如码块错误率(BLER)相当重要。当今而言，初步下链传输功率由控制无线电网络控制器(C-RNC)依据测量值的可取得性利用两种不同架构估计。
因为诸如衰减、机动性、测量值报告延时、及错误等因素，初步下链传输功率可能显著异于支撑信号干扰比(SIR)所实际需要的功率。倘若初步下链传输功率显著低于实际必要功率，在配置起始时间内的实际SIR会远低于必要SIR，这会造成许多传输错误。由于NRT服务的配置通常是短暂的，在配置起始时间内遭遇到的错误可能无法在短暂配置持续期间摊分以符合必要BLER。
发明内容
本发明提出一种用于蜂巢式网络调整非实时服务的初步下链传输功率以增进所感受服务品质的解决方案。
一种用来对一无线通信网络内的非实时服务进行初步下链传输功率调整的方法始于估计非实时服务的一初步下链传输功率电平。然后以估计的功率电平与一阈值做比较。判断该估计功率电平的一增加是否会影响相邻单元(cells)。倘若一增加不会影响相邻单元，则以一预定量调整该初步下链传输功率电平。
一种用来对一无线通信网络内的非实时服务进行初步下链传输功率调整的方法始于估计非实时服务的一初步下链传输功率电平。计算一估计时隙载波功率且与一阈值做比较。以比较结果为基础调整该初步下链传输功率。以该比较所用阈值为基础，可将该初步下链传输功率加大或维持于初步设定值。
附图说明
通过以下以举例方式提出的较佳实施例说明并参照附图，可对本发明更为详尽地理解，附图中：
图1为非实时服务的初步下链传输功率调整的全面策略的一流程图；且
图2是一将图1所示策略施行于宽频分码多重存取(WCDMA)分时双工(TDD)系统的流程图。
图3是一利用非实时服务的初步下链传输功率调整的系统的方块简图。
具体实施方式
图1为一由C-RNC估计初步下链传输功率的一方法100的流程图，该C-RNC使用一全测量值型算法或一公用测量值型算法。全测量值型算法在有专用及公用测量值可供予RNC时使用，而公用测量值型算法在仅有公用测量值可供予RNC时使用。方法100始于由C-RNC估计NRT服务的初步下链传输功率(步骤102)。以估计的初步下链传输功率与一阈值做比较(步骤104)，且倘若该估计功率高于该阈值即终止该方法(步骤106)。
倘若该估计功率低于该阈值(步骤104)，则判断初步下链传输功率的一增加是否会使相邻单元内的服务明显劣化(步骤108)。倘若相邻单元内的服务会明显劣化，则不做功率调整，且终止该方法(步骤106)。但，倘若一相邻单元内的服务不会明显劣化，则视在步骤104中遭遇的阈值而定使该初步下链传输功率加大一特定量(步骤110)。然后终止该方法(步骤106)。
直觉上来说，在条件许可时适当地加大初步下链传输功率会增进性能。在一实施例中，初步下链传输功率仅在满足下列条件时会被加大：
1)经C-RNC估计的初步下链传输功率低于一特定阈值。
2)初步下链传输功率的增加将不会使相邻单元内的服务明显劣化(举例来说，造成壅塞状况)。此效应可通过一相邻基地台(BS)的载波功率或通过下链干扰予以测定。
也可能初步下链传输功率有多个阈值。每一阈值有一与其相关的传输功率增加量。此增加量及这些阈值之值也取决于NRT服务的必要BLER，因为必要BLER是初步传输错误的容差的一指针。
一用来解决WCDMA TDD系统内的NRT服务的初步下链传输功率问题的解决方案示于图2。一方法200始于由C-RNC估计NRT服务的初步下链传输功率(步骤202)。其次，判断等于估计初步下链传输功率加上目前时隙载波功率的估计时隙载波功率是否低于一特定阈值(步骤204)。倘若该估计时隙载波功率小于最小B节点载波功率，则加大初步下链传输功率使得总时隙载波功率等于最小B节点载波功率加上一边际值Marginlow(步骤206)。Marginlow是一设计参数，其典型值在2-5dB范围内。必要BLER的值越低、Marginlow的值越高。然后终止该方法(步骤208)。倘若该估计时隙载波功率大于最小B节点载波功率但小于一载波阈值(ThresOwn_CaPwr；步骤204)，则判断相邻单元的平均时隙载波功率是否低于一特定阈值ThresNeighbor_CaPwr(步骤210)。另一选择，可利用此无线发射/接收单元(WTRU)在此单元的时隙内的干扰信号码功率(ISCP)ThresNeighbor_ISCP。这些阈值是由B节点的最大容许时隙载波功率以及NRT服务的必要BLER联合决定。最大容许时隙载波功率越高、所述这些阈值会越高。此外，必要BLER的值越低、所述这些阈值会越高。
倘若平均时隙载波功率低于ThresNeighbor_CaPwr，加大初步下链传输功率使得总时隙载波功率等于下述的较大者：最小B节点载波功率加上一边际值Marginmedium，或原始估计总时隙载波功率加上一边际值Marginoriginal(步骤212)。Marginmedium被决定为一使得因最小B节点载波功率加上Marginmedium而造成的干扰不会导致一相邻单元的时隙载波功率接近其最大容许值的最高边际值。Marginoriginal被决定为一使得因在ThresOwn_CaPwr水准的B节点载波功率加上Marginoriginal而造成的干扰不会导致一相邻单元的时隙载波功率接近其最大容许值的最高边际值。然后终止该方法(步骤208)。
在步骤210中，倘若相邻单元的平均时隙载波功率大于ThresNeighbor_CaPwr，则不对初步下链传输功率进行调整(步骤214)且终止该方法(步骤208)。倘若估计时隙载波功率大于载波功率阈值(ThresOwn_CaPwr；步骤204)，则不对初步下链传输功率进行调整(步骤214)且终止该方法(步骤208)。
应理解到在方法200中使用的所有参数(亦即边际值和阈值)与BLER直接或间接地相关。实务上来说，所有参数得经由仿真或现场测试/试验予以微调。
图3是一用于非实时服务的初步下链传输功率调整的一实施例的方块简图。一C-RNC 300接收NRT数据。一介质存取控制器308安排NRT数据以供传输。C-RNC300也有一用来决定所述这些NRT数据的一初步传输功率电平的初步NRT传输功率决定装置310。
已排程NRT数据被送到B节点302进行实体层处理312使其格式化以供经由空气接口306传输。一初步NRT传输功率调整装置314如前所述调整初步传输功率电平估计值。已调整的初步传输功率电平判断被用于调整一放大器316的增益。已放大的NRT信号由一天线318或一天线数组经由空气接口306放射。WTRU 304利用其天线320或天线数组接收该NRT信号且利用一NRT接收器322复原该NRT数据。
虽说以附图和文字说明本发明的特殊实施例，本领域普通技术人员可不脱离本发明的范围做出许多修改和变型。以上说明仅为范例，不以任何方式限制本发明。

Claims (8)

1.一种用来对一无线通信网络内的非实时服务进行初步下链传输功率调整的方法，其特征在于，包括以下步骤：
估计非实时服务的一初步下链传输功率电平；
以估计的功率电平与一阈值做比较；
判断所述估计功率电平的一增加是否会使相邻单元内的服务劣化；以及
以所述判断步骤为基础，以一预定量调整所述初步下链传输功率电平。
2.一种用来对一无线通信网络内的非实时服务进行初步下链传输功率调整的方法，其特征在于，包括以下步骤：
估计非实时服务的一初步下链传输功率电平；
计算一估计的时隙载波功率；
以所述估计时隙载波功率与一阈值做比较；以及
以比较结果为基础调整所述初步下链传输功率。
3.如权利要求2所述的方法，其特征在于，所述计算步骤包含将所述估计初步下链传输功率加至一目前时隙载波功率。
4.如权利要求2所述的方法，其特征在于，所述比较步骤包含比较所述估计时隙载波功率与一B节点的一最小载波功率电平。
5.如权利要求4所述的方法，其特征在于，所述调整步骤包含增加所述初步下链传输功率，藉此使总载波功率等于所述最小载波功率加上一边际值。
6.如权利要求2所述的方法，其特征在于，所述比较步骤包含判断所述估计时隙载波功率是否大于一B节点的一最小载波功率电平且小于一载波功率阈值。
7.如权利要求6所述的方法，其特征在于，所述调整步骤包含：
判断相邻单元的一平均时隙载波功率是否小于一阈值；以及
倘若所述平均时隙载波功率低于所述阈值，则增加所述初步下链传输功率，藉此使总载波功率等于以下二值当中较大者：所述最小载波功率加上一第一边际值，及所述估计时隙载波功率加上一第二边际值。
8.如权利要求2所述的方法，其特征在于，所述比较步骤包含比较所述估计时隙载波功率与一载波功率阈值。
CNA200480032627XA 2003-11-05 2004-10-21 非实时服务的初步下链传输功率调整 Pending CN1875553A (zh)

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US51769803P 2003-11-05 2003-11-05
US60/517,698 2003-11-05
US10/725,789 2003-12-02
US10/725,789 US7239885B2 (en) 2003-11-05 2003-12-02 Initial downlink transmit power adjustment for non-real-time services using dedicated or shared channel
PCT/US2004/034740 WO2005048030A2 (en) 2003-11-05 2004-10-21 Initial downlink transmit power adjustment for non-real-time services

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TW200623908A (en) 2006-07-01
WO2005048030A3 (en) 2005-11-17
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US7239885B2 (en) 2007-07-03
NO20062559L (no) 2006-08-02
AR046365A1 (es) 2005-12-07
CA2544696A1 (en) 2005-05-26
TW200529681A (en) 2005-09-01
EP1687912A2 (en) 2006-08-09
WO2005048030A2 (en) 2005-05-26
KR100752567B1 (ko) 2007-08-29
KR20060096102A (ko) 2006-09-05
KR20060096507A (ko) 2006-09-11
WO2005048030A9 (en) 2006-07-13
MXPA06005009A (es) 2006-07-06

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