WO2009117926A1 - 虚拟外场的无线测试系统 - Google Patents

虚拟外场的无线测试系统 Download PDF

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Publication number
WO2009117926A1
WO2009117926A1 PCT/CN2009/070864 CN2009070864W WO2009117926A1 WO 2009117926 A1 WO2009117926 A1 WO 2009117926A1 CN 2009070864 W CN2009070864 W CN 2009070864W WO 2009117926 A1 WO2009117926 A1 WO 2009117926A1
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Prior art keywords
cell
terminal
terminals
attenuation
network
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PCT/CN2009/070864
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English (en)
French (fr)
Inventor
罗俊卿
应关祥
李挺钊
王彦为
贺美迅
项荣
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华为技术有限公司
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Publication of WO2009117926A1 publication Critical patent/WO2009117926A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements

Definitions

  • the present invention relates to the field of communications, and in particular, to a wireless test system for a virtual external field.
  • the network side device and the terminal communicate through an air interface wireless propagation environment, generally called a wireless air interface channel.
  • a wireless air interface channel The diversity of the wireless propagation environment makes the air interface channel environment complex.
  • Laboratory test can only be simulated by professional equipment and technical solutions to simulate the complex process of wireless signal propagation.
  • the virtual external field technology of the indoor wireless test network is built indoors. By setting up a simulation platform of the near-real field or commercial mobile communication end-to-end test network in the laboratory, the test form and result in the laboratory are similar to the real field.
  • This technology can make up for the shortcomings of traditional indoor laboratory test scenario construction, and achieve high efficiency and low cost technology advantages through field-to-field, automated configuration and automated testing. It is also the most effective way to realize large-scale network including air interface automation test. , is a test solution that achieves high efficiency in various tests including wireless performance testing.
  • FIG. 1 it is a design diagram of an existing virtual external field.
  • the virtual external field replaces the wireless link propagation environment from the base station antenna to the terminal in the actual mobile communication network.
  • network elements such as network devices and terminals are entities, and the network scene is derived from the real scene or its abstract analysis. Equivalent scenario.
  • the virtual field technology has the characteristics of flexible scene construction and low relative cost.
  • the key points of the technology are the realization and simulation process of the air interface channel environment, and the realization of the near-commercial test environment in the laboratory. Built. There are many emulation devices or solutions in a single or multi-link channel environment, but there are very few solutions that can simulate a large-scale wireless network environment, and there are fewer solutions that enable commercial capability emulation.
  • a programmable adjustable attenuation matrix For a virtual external field technology with multiple cell networks, it is mainly implemented by a programmable adjustable attenuation matrix. As shown in Figure 2, it is an 8x8 (8IN80UT) 64-channel attenuation matrix structure diagram. Both ends of the input and output are 1/8 combiners, and the middle part of the device is an adjustable attenuator module that can adjust the strength of the input signal to simulate the slow fading process of a single link (such as a cell and a terminal communication connection).
  • the system consists of a 16x16 attenuation matrix, 16 cells (CELL) and 1018 terminals.
  • the terminal combines the signals into the system through the combiner, and each of the eight terminals is combined by a 1/8 combiner.
  • the 890 terminals in the lower part of the scheme are only used as the terminal of the scene background such as cell load, traffic, and interference, and cannot be switched.
  • KPI Key Performance Indicators
  • the terminal service mode is not rich, and there are many differences between the terminal business model and the actual scenario.
  • MS 1 to 56 form a signal through the combiner-level joint road, and the signal is only connected to one cell, and the cell signal can only reach the terminal connected under the combiner connected to the cell.
  • the signals of MS1 ⁇ 56 can only go to the CELL1 cell, then these terminals can only connect to one cell at the same time, and there is no cross-cell activity such as handover; 890 background terminals can't affect the network performance in the platform. The impact on network performance in actual networks is compared.
  • the attenuation module controls the signal strength of one channel consistently, and the movement modes of the MS1 ⁇ 56 in the network are also the same.
  • the attenuation matrix can only simulate the slow fading process of the signal propagation process.
  • the fast fading process the multipath and delay of the signal propagation process cannot be characterized.
  • the scale cannot be expanded.
  • the prior art cannot expand the number of terminals in a large amount, and the capacity for expanding the number of network cells is limited, and the platform cannot evolve to a very large-scale network.
  • simulation planning is performed on the network scale of 7 base station 21 cell, 9 base station 27 cell, 19 base station 57 cell, 25 base station 75 cell, because such a network form is typical and analyzable.
  • embodiments of the present invention provide a wireless external field wireless test system capable of simulating the environmental capability of a large-scale mobile communication network and improving the degree of similarity with the actual mobile communication network.
  • a wireless external field wireless test system comprising: a plurality of cells, a plurality of combiners, a plurality of attenuation matrices, a multi-channel wideband channel simulation instrument, and a plurality of terminals, each attenuation matrix being connected to a portion of the terminals
  • the combiner interconnects the part of the terminal with the cell, and an attenuation matrix cascades the multi-channel wideband channel emulation instrument, and then interconnects the terminal connected to the attenuation matrix with the cell through the combiner.
  • a wireless external field wireless test system uses an attenuation matrix and a multi-channel wideband channel simulation instrument to implement multi-base station and large-scale terminal access capability, and simulate the environmental capability of a large-scale mobile communication network. And the communication process can simulate the same scale communication process in the actual mobile communication network.
  • Figure 1 is a design architecture diagram of an existing virtual external field
  • FIG. 2 is a schematic structural diagram of an existing 64-channel attenuation matrix
  • FIG. 3 is a conventional wireless test system for a virtual external field
  • FIG. 4 is a schematic structural diagram of a cell of a base station 21 cell according to Embodiment 7 of the present invention.
  • FIG. 5 is a schematic diagram of a wireless external field wireless test system according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of each terminal according to an embodiment of the present invention.
  • the embodiment of the present invention can simulate a network model of a multi-base station multi-cell such as a base station 21 cell, a 9 station 27 cell, a 19 base station 57 cell, a 25 base station 75 cell, and the like.
  • FIG. 4 is a schematic diagram showing the cellular structure of the 7 base station 21 cell.
  • Figure 5 shows a 7 base A wireless test system for the virtual field of the 21-cell.
  • the system includes a cell 51, a combiner 52, an attenuation matrix 53, a wideband channel simulator 54 and a terminal 55, each connected by a radio frequency cable.
  • a total of 21 cells 51 are connected to the system, which can realize 21-cell networking.
  • the system is equipped with 21 1/21 combiners 52, 21 21 x 20 attenuation matrices 53 and a 21-channel wideband channel emulation instrument 54, and designed 420 channels for a total of 2100 terminals 55 that can move freely in the network.
  • User capacity each terminal includes 5 terminals.
  • Each of the 100 (20-way) terminals 55 is connected to an attenuation matrix 53 and interconnected with 21 cells 51 via 21 1/21 combiners 52.
  • an attenuation matrix 53 cascades a wideband channel emulation device 54 and interconnects the terminal 55 connected to the attenuation matrix 53 with the cell 51 through the combiner 52, that is, 100 terminals 55 (shown in the test terminal portion)
  • the wideband channel emulation instrument 54 is cascaded to implement various complex channel emulation tests.
  • the link communication process connected by the wideband channel emulation instrument 54 is close to the communication process of the real field channel environment, and multipath and Doppler can be realized.
  • the 100 terminal 55 is also referred to as a test terminal; and another 2000 terminal 55 (illustrated background terminal portion) serves as a user background of the network, and constructs a commercial network scene, also called a background terminal.
  • the use of the background terminal is established for creating a similar commercial network user. Since the terminals in the actual network do not all move in the network during the communication process, most of the terminals move at a fixed location or low speed during the communication process. Generally, only the link relationship of several cells is involved. Although these background terminals are at fixed locations, some of the terminals may be in the soft handover area, or may be at the edge of multiple cells, and ping-pong handovers may occur continuously. In the GSM network, these terminals are still constantly frequency-modulated, so these terminals are not only The camping cell has a connection relationship, and needs to be interconnected to other cells in the network that have a direct link relationship with the terminal.
  • the background terminal also needs to pass the attenuation matrix ( ⁇ : ⁇ is the number of cells to be connected 4 ⁇ 32; The number of terminals that need to be connected is 16 ⁇ 32) is connected to multiple cells in the network.
  • the design background terminal is connected to the cells of the network through 20 21 x20 attenuation matrices, but these background terminals can be interconnected by the ⁇ attenuation matrix according to requirements.
  • Test terminal is fully interconnected through 21 x20 The mode accesses each cell in the network to maintain a certain number of terminals in the network that can perform any activity.
  • the 2100 terminal 55 is connected to the network through the attenuation matrix 53, and each of the 20 terminals is connected to an attenuation matrix 53.
  • the attenuation matrix 53 controls the communication process by regulating the strength of the link signal between the terminal 55 and the cell. . If the terminal MS1 needs to communicate with the cells CELL1 and CELL2, it is assumed that an attenuation module V.attl (not shown) is provided between MS1 and CELL1, and an attenuation module V.att2 is provided between MS1 and CELL2 (not shown).
  • the attenuation module V.attl and the attenuation module V.att2 are both disposed in an attenuation matrix 53.
  • the attenuation modules V.attl and V.att2 in the attenuation matrix are controlled by software to make the attenuation value of V.attl smaller.
  • the V.att2 attenuation value is larger.
  • the attenuation module (V.att) can be precisely adjusted to a specific level, so that the link signal strengths of MS1 and CELL1, CELL2 can be set to the corresponding target values, and accordingly the terminal can be switched by signal strength or interference level. Actions, the most basic mobile communication process.
  • the MS1 user receives the signals of the cells CELL1 and CELL2, and the MS1 terminal is in the software switching area. Similarly, if the MS1 terminal receives multiple cells, such as CEIX1, CELL2, CELL3, and CEIX4, the MS1 terminal is in the software switching area of four cells of CEI 1, CELL2, CELL3, and CEI 4.
  • all terminals can be interconnected with any one of the cells in the network, and the user density and service mode of the cell can be dynamically adjusted during the test.
  • These terminals can freely perform various actions initiated by actual network users such as handover. For example, a large number of users concentrate on congestion in several cells, a large number of terminals communicate in a soft handover area, etc., and only need to reduce the attenuation value of the attenuation module between the terminal and the cell in the attenuation matrix to increase the attenuation matrix.
  • the attenuation value of the attenuation module between the terminal and other cells can enhance the signal strength of the connection link between the terminal and the target cell, and reduce the signal strength of the connection link between the terminal and other non-target cells.
  • each terminal link is basically the same, the correlation is too large, and the actual communication effect is different.
  • this embodiment can also design a digital phase shift array, and a digital phase shifter 66 is added in front of each terminal, and the digital phase shifter is used to adjust the amplitude fluctuation rhythm of different terminals to enable the terminal signal. After a random phase shift adjustment, the signal is combined into the combiner to reduce the correlation of the signals between the terminals on the same combiner, thereby further enhancing the authenticity of the link. It will be appreciated that the number of terminals 55 can vary.
  • the background terminal can be 1900 parts
  • the test terminal can be 200 parts, and the like.
  • each 100 terminals 55 need not be interconnected with 21 cells after being connected to an attenuation matrix 53, and it can be interconnected with most cells, such as 18 cells.
  • the number of cells is related to the network model of the network in which the cell is located. Any group of terminals and cells of the interconnection have independent controllable link relationships.
  • the terminal business model is rich, which enhances the similarity of the industry system to the actual field test simulation. It can replace most of the test content of the field or commercial office in the laboratory, and complete 90% of the test volume, thus reducing the field and commercial
  • the factors that determine the uncertainty of the test process greatly shorten the test cycle of the product and reduce the test cost.
  • the interference of mobile communication mainly comes from the network itself. Inter-user interference and small-area interference are the most important interferences. In this embodiment, because a large number of users are accessed, a network load environment is constructed, and interconnected link relationships are implemented, and a large amount of inter-user interference and inter-cell interference are realized, and noise in the network can be compared with actual The noise of the network environment is equivalent, so that the GSM frequency hopping test, the interference based channel allocation (IBCA) test, and the like, which cannot be implemented in the prior art, can be implemented.
  • IBCA interference based channel allocation
  • each terminal can be small or even small in the network
  • the area generates a link relationship, and the uplink and downlink interference and the real network are small.
  • the wireless test system can implement multi-base station and large-scale terminal access capability, simulate the environment capability of a large-scale mobile communication network, and the communication process can simulate the same in the actual mobile communication network.
  • the scale of the communication process can implement multi-base station and large-scale terminal access capability, simulate the environment capability of a large-scale mobile communication network, and the communication process can simulate the same in the actual mobile communication network. The scale of the communication process.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Description

虚拟外场的无线测试系统 本申请要求了 2008年 3月 28 日提交的， 申请号为 200810066224.7, 发 明名称为 "虚拟外场的无线测试系统" 的中国申请的优先权， 其全部内容通 过引用结合在本申请中。
技术领域
本发明涉及通信领域， 特别涉及一种虚拟外场的无线测试系统。
背景技术
在实际的无线通信过程中， 网絡侧设备和终端通信要经过一个空口无线 传播环境， 一般称为无线空口信道。 无线传播环境多样造成空口信道环境复 杂， 信号在空中传播时会受到很多复杂因素的影响， 如距离、 地形、 地物等 等， 而这样复杂的无线传播环境是不可能移至室内的， 要实现实验室内测试 只能通过专业设备和技术解决方案对其进行仿真模拟， 模拟其无线信号传播 的复杂过程。
室内组建外场无线测试网絡的虚拟外场技术， 通过在实验室内搭建近真 实外场或商用移动通信端到端的测试网絡的模拟仿真平台， 使得在实验室内 的测试形式与结果近似真实外场。 该技术能够弥补传统室内实验室测试的场 景构建的缺陷， 并且通过外场转内场、 自动化配置及自动化测试实现高效率、 低成本的技术优势， 也是实现大规模网絡包括空口自动化测试最有效的方法， 是包括无线性能测试在内的各种测试获得高效率的一种测试解决方案。
如图 1 所示， 是一个现有的虚拟外场的设计架构图。 虚拟外场通过替代 实际移动通信网絡中从基站天线到终端之间的无线链路传播环境， 除空口信 道环境， 网絡设备和终端等网絡单元都为实体， 网絡场景来源于真实场景或 其抽象分析后的等效场景。
虚拟外场技术具有场景构建灵活， 相对成本低等特点， 其技术关键点是 对空口信道环境的实现和模拟过程， 以及实现实验室内近商用测试环境的构 建。 业界有很多单或多链路信道环境的仿真设备或解决方案， 但具备模拟较 大规模无线网絡环境能力的解决方案非常少， 能实现商用能力模拟的解决方 案更少。
对于有多个小区组网的虚拟外场技术， 主要通过可编程的可调衰减矩阵 来实现。 如图 2所示， 是一个 8x8 ( 8IN80UT ) 64通道的衰减矩阵结构示意 图。 输入输出两端是 1/8合路器， 中间部分的器件是可调衰减器模块， 可以调 控输入信号的强度， 模拟单链路（如一个小区和一个终端的通信连接） 的慢 衰落过程。 在输入端接上小区 （共可接 8个小区）， 在输出端接上与这些小区 通信的终端（共可接 8路终端）， 衰减矩阵的结构特点使得 8个小区的每个小 区信号都能到达 8路终端， 信号强度可快速调控， 而 8路终端的每部终端信 号都能到达 8个小区的任何一个小区， 信号强度也可调控。 这样能够近似模 拟 8路终端在 8小区网絡中的各类场景， 可以实现切换、 覆盖等多种测试项 目。
如图 3所示， 是一种现有的虚拟外场的无线测试系统， 可以实现 16小区 和 1018部终端互联。
该系统由一台 16x16衰减矩阵、 16个小区（CELL )和 1018部终端组成。 终端通过合路器将信号合路接入系统中，每 8部终端通过一个 1/8的合路器合 成一路。
该方案中图示下部分的 890部终端只作为小区负载、 话务、 干扰等场景 背景的终端， 不能做切换。 图示上部分的 16 路共 128 部终端， 可以和 CELL 1〜CELL 16的 16个小区实现全互联，这 128部终端可以产生大量的切换、 业务呼叫、 终止等动作， 能够参考网絡话务模型做多种 KPI ( Key Performance Indicators, 关键绩效指标）测试。 所有的业务过程和控制都通过软件实现。
但是该种设计方案存在不少技术缺陷， 降低了其和外场、 商用网絡真实 程度的拟合性：
( 1 )终端业务模式不丰富，和实际场景终端业务模型有较多区别。如 890 部背景终端中， MS 1〜56通过合路器级联合路成一路信号， 而这一路信号只连 接在一个小区上， 小区信号只能到达该小区所接的合路器下面连接的终端上， 而 MS1〜56的信号也只能到 CELL1小区上， 那么这些终端最多只能同时连接 一个小区， 不能发生切换等跨小区活动； 890部背景终端在平台中对网絡性能 影响远不能和其分布在实际网絡中的对网絡性能的影响相比较。 此外由于 MS1〜56通过合路器级联合路成一路信号，衰减模块对一路信号强度调控是一 致的， MS1〜56在网絡中的移动模式也会完全一样。
( 2 )缺乏对网絡干扰的模拟。 在通信中最重要的影响就是干扰， 网絡干 扰仿真能力弱， 直接影响平台的可测试性。 现有技术的背景终端只和终端驻 留的小区有链路关系， 没有邻区干扰， 终端间干扰又恒定不变， 甚至终端间 没有干扰， 使得网絡通信过程缺少实际网絡的复杂变换的灵活性。 这样的平 台结构在 GSM ( Global System for Mobile Communications, 全球移动通讯系 统 ) 网絡中不可做 IBCA ( Interference-Based Channel Allocation, 基于干扰的 信道分配）， 在 CDMA ( Code-Division Multiple Access, 码分多址） 系统中由 于没有考虑网絡干扰水平， 测出来的话务量和实际形态相差太大， 不能完全 表征网絡实际应当表现的性能。
( 3 )缺乏对快衰落、 多普勒等空口信道强相关的实时仿真能力， 降低了 无线空口通信过程的真实性。 衰减矩阵只能对信号传播过程的慢衰落过程进 行模拟， 而对快衰落过程， 已经信号传播过程的多径、 时延无法表征。
( 4 )规模无法扩展。 现有技术无法大量扩展终端的数量， 对于网絡小区 数量的扩展能力也有限， 平台不能向超大规模网絡演进。
( 5 )无论是 8小区还是 16小区都难以对应于网絡规划仿真的模型， 这 样的系统与仿真规划软件的结合能力较弱。 一般在蜂窝移动通信网絡规划中 以 7基站 21小区、 9基站 27小区、 19基站 57小区、 25基站 75小区的网絡 规模进行仿真规划， 因为这样的网絡形态具有典型性和可分析性。
( 6 ) 890部背景终端和小区连接固定， 在测试过程中可活动性差， 无法 在测试过程中动态配置各个小区的终端负载程度。
发明内容
有鉴于此， 本发明实施例提供一种虚拟外场的无线测试系统， 该无线测 试系统能够模拟较大规模移动通信网絡的环境能力， 提升与实际移动通信网 絡的相似程度。
一种虚拟外场的无线测试系统， 所述系统包括： 多个小区、 多台合路器、 多个衰减矩阵、 多通道宽带信道仿真仪器以及多部终端， 每个衰减矩阵与部 分终端相连后通过合路器将这部分终端与小区互联， 其中一个衰减矩阵级联 所述多通道宽带信道仿真仪器后通过合路器将与所述衰减矩阵相连的终端与 小区互联。
本发明实施例提供的一种虚拟外场的无线测试系统， 釆用衰减矩阵和多 通道宽带信道仿真仪器， 能够实现多基站和较大规模终端接入能力， 模拟较 大规模移动通信网絡的环境能力， 并且通信过程能够仿真实际移动通信网絡 中同等规模的通信过程。
附图说明
图 1为现有的虚拟外场的设计架构图；
图 2为现有的 64通道的衰减矩阵结构示意图；
图 3为现有的一种虚拟外场的无线测试系统；
图 4为本发明实施例 7基站 21小区蜂窝结构示意图；
图 5为本发明实施例一种虚拟外场的无线测试系统；
图 6为本发明实施例每路终端的结构示意图。
具体实施方式
本发明实施例可以对 7基站 21小区、 9站 27小区， 19基站 57小区， 25 基站 75小区等多基站多小区的网絡模型进行仿真。
以下以 7基站 21小区的网絡为例进行说明。
图 4所示为 7基站 21小区的蜂窝结构示意图。 图 5所示为一种包括 7基 站 21小区的虚拟外场的无线测试系统。 该系统包括小区 51、 合路器 52、 衰 减矩阵 53、 宽带信道仿真仪器（Channel simulator ) 54以及终端 55 , 各器件 通过射频线缆连接。
该系统中共接入了 21个小区 51 , 可实现 21小区组网。 该系统设有 21台 1/21合路器 52、21个 21 x20衰减矩阵 53和 1台 21通道宽带信道仿真仪器 54, 并设计了 420路共 2100部可在网絡中自由移动的终端 55的用户容量， 每路 终端包括 5部终端。 每 100部 （20路）终端 55与一个衰减矩阵 53相连， 并 通过 21台 1/21合路器 52与 21小区 51互联。其中， 一个衰减矩阵 53级联了 1台宽带信道仿真仪器 54后通过合路器 52将与该衰减矩阵 53相连的终端 55 与小区 51互联， 即， 100部终端 55 (图示测试终端部分）级联了宽带信道仿 真仪器 54, 可以实现各种复杂的信道仿真测试， 经过该宽带信道仿真仪器 54 连接的链路通信过程接近真实外场的信道环境的通信过程， 可以实现多径、 多普勒频移和任意的信道模型， 该 100部终端 55也称为测试终端； 另外 2000 部终端 55 (图示背景终端部分）作为网絡的用户背景， 构建商用网絡场景， 也称为背景终端。
背景终端的使用是为创建类似商业网絡用户而设立的， 由于实际网絡中 的终端在通信过程中不是全部都在网絡中不停移动， 而是大部分终端在通信 过程中固定地点、 或低速移动， 一般只涉及几个小区的链路关系。 这些背景 终端虽然是在固定地点， 但是可能一部分终端处于软切换区中， 也可能处于 多个小区边缘， 不停发生乒乓切换， GSM网絡中这些终端还在不停的调频， 所以这些终端除了和其驻留小区有连接关系， 还需要同时互联到网絡中其他 和该终端有直接链路关系的小区上， 背景终端也需要通过衰减矩阵（ΜχΝ: Μ是所需连接的小区数量 4 ~ 32; Ν是需要连接的终端路数 16 ~ 32 )连接到 网絡中的多个小区上。 在本实施例中， 为了充分说明终端与网絡的互联性， 设计背景终端通过 20个 21 x20衰减矩阵连接到网絡的小区上， 但是这些背景 终端可以根据需求通过 ΜχΝ衰减矩阵进行互联。测试终端通过 21 x20全互联 的方式接入网絡中的各个小区， 以保持网絡中存有一定数量的可以做任意活 动的终端。
在本实施例中 , 2100部终端 55通过衰减矩阵 53接入网絡中 ,每 20路终 端对应连接一个衰减矩阵 53 , 衰减矩阵 53通过调控终端 55与小区间的链路 信号强弱来控制通信过程。 如终端 MS1需要和小区 CELL1、 CELL2进行通 信， 假定 MS1 和 CELL1 之间设有一个衰减模块 V.attl (图未示）， MS1 和 CELL2之间设有一个衰减模块 V.att2 (图未示）， 衰减模块 V.attl和衰减模块 V.att2均设于一个衰减矩阵 53内。当 MS1和 CELL1的链路信号较强，而 MS1 和 CELL2的链路信号较弱，则通过软件调整控制衰减矩阵中的衰减模块 V.attl 和 V.att2, 使 V.attl衰减值小一些， V.att2衰减值大一些。 衰减模块（ V.att )能 够精确调控到特定电平值， 这样 MS1和 CELL1、 CELL2的链路信号强度就 可设定到相应目标值， 相应地终端就可通过信号强度或干扰水平进行相应切 换动作， 实现最基本的移动通信过程。 如果设置的衰减模块 V.attl和 V.att2对 信号调控值差不多， MS1用户接收到小区 CELL1、 CELL2的信号就差不多， 这时 MS1终端就处于软件切换区了。 同样， 如果 MS1终端接收到多个小区， 如 CEIX1、 CELL2, CELL3 , CEIX4的信号差不多， 那么此时 MS1终端就 处于 CEI 1、 CELL2, CELL3 , CEI 4四个小区的软件切换区了。
在本实施例中， 所有的终端都可以和网絡中任意一个小区互联， 可以在 测试中动态调整小区用户密集程度和业务模式， 这些终端可以自由地做切换 等实际网絡用户发起的各种动作。 比如大量用户集中向几个小区涌入的拥塞 情形、 大量终端在软切换区通信等等， 只需要通过调低衰减矩阵中该终端和 该小区间的衰减模块的衰减值， 调高衰减矩阵中该终端和其他小区间的衰减 模块的衰减值， 即可增强终端和目标小区连接链路的信号强度， 降低终端和 其他非目标小区的连接链路的信号强度。
在每路终端接入的 5部终端，由于通过一台 1/5合路器和一个衰减通道接 入小区， 每路终端链路基本一致， 相关性太大， 和实际通信效果有差异。 如 图 6所示， 本实施例还可以设计数字相移阵列， 在每部终端前加上数路移相 器 66, 该数路移相器用于调整不同终端的幅值波动节奏， 可使终端信号经过 随机的相移调整才将信号合入合路器中， 降低同一合路器上终端间信号的相 关性， 因而可进一步增强链路的真实性。可以理解， 终端 55的数量可以改变。
可以理解，背景终端和测试终端的数量可以改变，如背景终端可以为 1900 部 , 测试终端可以为 200部等。
可以理解， 每 100部终端 55与一个衰减矩阵 53相连后不一定需要与 21 个小区互联， 其与大部分小区互联即可， 如 18个小区。
所述小区的数量与该小区所处网絡的网絡模型相关。 所述互联的任何一 组终端和小区都有独立可控的链路关系。
本发明实施例可以达到如下效果：
( 1 )终端业务模式丰富，提升了业界系统对实际外场测试仿真的相似性， 在实验室内就能够替代外场或商用局大部分测试内容， 完成 90%的测试量， 因而能够降低外场及商用局测试过程不确定的因素， 大大缩短产品的测试周 期， 并降 ^则试成本。
( 2 )提升虚拟外场平台网絡干扰和实际移动通信网絡干扰的相似程度， 支持各类基于干扰测试的对干扰的技术要求。 移动通信的干扰主要来源于网 絡本身， 用户间干扰、 小区间干扰是最主要的干扰。 在本实施例中， 由于接 入了非常多的用户数， 构建了网絡负载环境， 并实现了互联的链路关系， 实 现了大量的用户间干扰和小区间干扰， 网絡中的噪声可以和实际网絡环境的 噪声相当， 因而可以实现现有技术中不能实现的 GSM的跳频测试、基于干扰 的信道分配（IBCA )测试等。
( 3 )增加虚拟外场平台对空口信道的实时仿真能力。
( 4 )支持典型的蜂窝结构组网配置， 方便实现虚拟外场平台和网絡仿真 规划软件的对接。
( 5 )灵活扩展背景终端数量， 每部终端可以和网絡中的几个甚至全部小 区产生链路关系， 上下行干扰和真实网絡相差小。
综上所述， 在本发明实施例中， 无线测试系统能够实现多基站和较大规 模终端接入能力， 模拟较大规模移动通信网絡的环境能力， 并且通信过程能 够仿真实际移动通信网絡中同等规模的通信过程。
综上所述， 以上仅为对本发明精神的展示， 而非用于限制本发明的保护 范围。 凡在本发明的精神和原则之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。

Claims

权利 要 求 书
1、 一种虚拟外场的无线测试系统， 其特征在于， 所述系统包括： 多个小区、 多台合路器、 多个衰减矩阵、 多通道宽带信道仿真仪器以及多部终端， 每个衰 减矩阵与部分终端相连后通过合路器将这部分终端与小区互联， 其中一个衰减 矩阵级联所述多通道宽带信道仿真仪器后通过合路器将与所述衰减矩阵相连的 终端与小区互联。
2、 如权利要求 1所述的虚拟外场的无线测试系统， 其特征在于， 所述小区 的数量与该小区所处网絡的网絡模型相关。
3、 如权利要求 1所述的虚拟外场的无线测试系统， 其特征在于， 所述互联 的终端和小区有独立可控的链路关系。
4、如权利要求 1至 3任一项所述的虚拟外场的无线测试系统，其特征在于， 所述小区共有 21个， 所述终端共有 2100部， 包括 2000部背景终端和 100部测 试终端， 其中， 每 100部背景终端与 1个衰减矩阵通过射频线缆相连， 并通过 合路器与 21个小区互联， 100部测试终端与 1个衰减矩阵通过射频线缆相连后 级联所述多通道宽带信道仿真仪器， 并通过合路器与小区互联。
5、 如权利要求 4所述的虚拟外场的无线测试系统， 其特征在于， 所述衰减 矩阵共有 21个 21 X 20衰减矩阵。
6、 如权利要求 4所述的虚拟外场的无线测试系统， 其特征在于， 所述多通 道宽带信道仿真仪器为 21通道宽带信道仿真仪器。
7、 如权利要求 1所述的虚拟外场的无线测试系统， 其特征在于， 所述系统 还包括数路移相器， 所述数路移相器用于调整不同终端的幅值波动节奏， 其与 终端相连。
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