WO2017096662A1 - 一种用于异构网中微小区的增强型上行分数功率控制方法 - Google Patents

一种用于异构网中微小区的增强型上行分数功率控制方法 Download PDF

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WO2017096662A1
WO2017096662A1 PCT/CN2015/099670 CN2015099670W WO2017096662A1 WO 2017096662 A1 WO2017096662 A1 WO 2017096662A1 CN 2015099670 W CN2015099670 W CN 2015099670W WO 2017096662 A1 WO2017096662 A1 WO 2017096662A1
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cell
base station
macro
micro
macro cell
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PCT/CN2015/099670
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French (fr)
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赵生捷
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同济大学
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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
    • H04W52/02—Power saving arrangements
    • H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
    • 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
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • 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
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • 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
    • H04W52/244—Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a micro cell uplink power control method, and in particular to an enhanced uplink fraction power control method for a micro cell in a heterogeneous network.
  • LTE-A LTE-Advanced
  • a co-channel can be used within the coverage of a macro cell ( That is, co-channel mode deploys some low-power micro cells (such as small cells), such as Pico cells; the resulting network is often referred to as heterogeneous networks (ie Heterogenous Networks, referred to as HetNets).
  • the corresponding base station transmits reference symbols, and the reference symbols transmitted by the respective base stations are mutually orthogonal.
  • Each user equipment measures the power of reference symbols received from its surrounding base stations, including its serving base stations.
  • any user equipment reports its measured reference symbol received power (ie, reference symbol received powers, RSRPs) to its serving base station.
  • RSRPs reference symbol received powers
  • the RSRP ij represents the power of the reference symbol received by the UE j measured from the base station i
  • the conventional cell association criterion based on the measured reference symbol received power can be expressed as follows:
  • UE j will be associated with the base station whose measured power of the reference symbols received from its surrounding base stations is the highest.

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

Abstract

本发明涉及一种用于异构网中微小区的增强型上行分数功率控制方法，所述异构网包括宏小区以及部署在该宏小区内的多个微小区，所述宏小区和微小区内用户设备分别由宏基站和微基站提供服务，包括步骤：A.根据宏基站可允许的上行链路干扰量级和微小区对宏小区的上行链路干扰情况设定被微小区m所服务的任意一个用户设备的功率基准值的上界值P0 (dBm,upper)；B.定义一个可抑制微小区对宏小区的上行链路跨层干扰的、增强型功率基准值：P0 (dBm,constrained)=min(P0 (dBm), P0 (dBm, upper))；C.在传统上行分数功率控制方法中，采用增强型功率基准值P0 (dBm,constrained)，从而更加有效地控制所述用户设备的发射功率。与现有技术相比，本发明能有效减少微小区对宏小区的上行链路干扰，从而增强了LTE-A系统中异构网的通信质量。

Description

一种用于异构网中微小区的增强型上行分数功率控制方法 技术领域
本发明涉及一种微小区上行功率控制方法，尤其是涉及一种用于异构网中微小区的增强型上行分数功率控制方法。
背景技术
为了增加传统的仅部署宏小区(即Marcocell)的蜂窝移动通信网络的容量和/或覆盖，在LTE-Advanced(简称LTE-A)系统中，考虑可以在宏小区的覆盖范围内以共信道(即co-channel)方式部署一些低功率的微小区(即small cells)，比如Pico小区；由此所致的网络通常被称为异构网(即heterogeneous networks，简称HetNets)。
当在宏小区内部署了多个可以开放给所有网络用户进行访问的微小区时，一些用户设备可以由微小区进行服务，从而减轻宏小区的负担，实现负载平衡。
在LTE-A系统中，不论是宏小区还是微小区，其对应的基站(eNB)会发送参考符号，并且各个基站所发送的参考符号之间是互相正交的。每个用户设备会测量从其周围的基站(包括其服务基站)接收的参考符号的功率。并且，任意一个用户设备均会将其测量的参考符号接收功率(即reference symbol received powers，简称RSRPs)报告给其服务基站。
对于任意一个用户设备UEj，用
Figure PCTCN2015099670-appb-000001
表示其周围基站的小区索引的集合。并且，用RSRPij表示UEj测量的从基站i接收的参考符号的功率，那么常规的基于测量的参考符号接收功率的小区关联准则可以表达如下：
Figure PCTCN2015099670-appb-000002
上述准则的含义是，UEj将关联到其测量的从其周围基站接收的参考符号的功率最大的那个基站。
在宏小区与微小区共信道部署的异构网中，如果仍然应用如(1)中所给出的小区关联准则，那么相比于微小区，将有更多的用户设备被关联到宏小区，原因是宏小区基站的发送功率远大于微小区基站的发送功率。在这种情况下，

Claims (1)

  1. 微小区的可用资源没有得到充分的利用，而在宏小区中，对于可用资源的竞争会很激烈。为了更有效地利用由微小区提供的潜在负载平衡功能，“3GPP,R1-094225,DL performance with hotzone ce l l s,RAN1#58b”给出了一种方案，对于部署有宏小区与微小区的异构网，对任意一个UEj，使用如下的小区关联准则：
    Figure PCTCN2015099670-appb-100001
    上述准则的含义是，UEj将关联到其测量的从其周围基站接收的参考符号的功率与相应基站的偏置值(biasi)之和最大的那个基站(宏小区基站或微小区基站)。
    在上述等式(2)中，对于宏小区，偏置值为0；而对于每个微小区，偏置值为一个非负值，从而可以有更多的用户设备由微小区服务。由于偏置值的使用相当于给予了微小区扩展用户设备关联的范围的能力，因此这个过程叫作微小区的覆盖范围扩展(即range extension，简称RE)，上述偏置值也叫作覆盖范围扩展偏置值。
    在异构网中，是在每个宏小区的覆盖范围内以共信道方式部署一些微小区,宏小区的覆盖范围与部署在其中的那些微小区的覆盖范围是相互重叠的。因此，在异构网中，宏小区与其覆盖范围内的微小区之间的干扰远强于宏小区与相邻宏小区之间的干扰。具体而言，一方面，位于宏基站(即Macro eNB，简称MeNB)附近的被某个微小区所服务的用户设备(即Pico UE，简称PUE)会干扰宏基站对上行链路信号的接收。另一方面，位于微小区覆盖范围附近的被宏小区所服务的用户设备(即Macro UE，简称MUE)会干扰相应微基站(即Pico eNB，简称PeNB)对上行链路信号的接收。
    若所有微小区都开启了覆盖范围扩展(即RE)功能，微小区覆盖范围附近的一些原先被宏小区所服务的用户设备将会被重新关联到微小区，这样就会减少被宏小区所服务的用户设备对相应微基站的上行链路干扰。但是由微小区的覆盖范围扩展功能所导致的这些与相应微小区关联的用户设备(即RE-resulted PUEs)可能会反过来对宏基站的上行链路信号接收带来明显的(甚至是严重的)干扰。
PCT/CN2015/099670 2015-12-08 2015-12-30 一种用于异构网中微小区的增强型上行分数功率控制方法 WO2017096662A1 (zh)

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