CN101340647B - Wireless access system and carrier moving method based on centralized base station - Google Patents

Wireless access system and carrier moving method based on centralized base station Download PDF

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CN101340647B
CN101340647B CN 200710122982 CN200710122982A CN101340647B CN 101340647 B CN101340647 B CN 101340647B CN 200710122982 CN200710122982 CN 200710122982 CN 200710122982 A CN200710122982 A CN 200710122982A CN 101340647 B CN101340647 B CN 101340647B
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frequency
signal
unit
optical
carrier
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CN101340647A (en
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宗柏青
赵志勇
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中兴通讯股份有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08Access point devices
    • H04W88/085Access point devices with remote components

Abstract

The invention discloses a wireless access system based on a centralized base station, which comprises a centralized base station and a remote antenna unit. The centralized base station is used for the dynamic configuration or virtual carrier frequency shifting of a carrier frequency signal, and the carrier frequency signal is modulated and multiplexed to light wave and then the light wave is multiplexed to an optical fiber link; the remote antenna unit is connected with the centralized base station by the optical fiber link as well as is used for extracting the carrier frequency signal modulated to an optical wave link and transmitting the signal to covered areas by a transmitting antenna. The invention also discloses a carrier frequency removal method based on the centralized base station. The system of the invention inherits the advantages of a distributed antenna system, enhances spectrum utilization rate and system capacity, and meanwhile realizes the functions of virtual carrier frequency removal and dynamic configuration of wireless resources.

Description

基于中心化基站的无线接入系统及载频搬移方法 A wireless access system based on the center of the base station carrier frequency and moving method

技术领域 FIELD

[0001] 本发明涉及一种无线通信领域中的无线信号接入技术,具体说,涉及一种基于中心化基站的无线接入系统及载频搬移方法。 [0001] The present invention relates to a wireless signal in a wireless access technology in the communication field, and particularly, to a wireless access system and method for carrier frequency based on the center of the moving base station.

背景技术 Background technique

[0002] 无线通信是通信领域中最活跃的分支之一,也是当前发展最快通信技术。 [0002] Wireless communications is one of the most active in the field of communication branch, is currently the fastest growing communications technology. 蜂窝概念的提出使移动通信得到了飞速发展,无论是第一代模拟通信系统,第二代数字通信系统, 还是第三代通信都沿用了蜂窝式覆盖的网络结构。 Concept proposed cellular mobile communication has been rapid development, whether it is a first-generation analog communication system, a second generation digital communication system or a third generation communication network structure have followed a cellular coverage. 蜂窝覆盖是将地理区域划分为若干小区,每个小区中建立一个基站和天线(也有几个小区共用一个基站和天线的情况)来覆盖整个小区,小区内的所有用户都接入该基站。 Cellular coverage to a geographical area is divided into several cells, to establish a base station antennas and each cell (there is a case several cells share one antenna and the base station) to cover the entire cell, all users in a cell have access to the base station. 这种网络结构对提高频谱利用率起到了一定作用,其常规方法是进行小区分裂和小区扇区化,但是,这种方法只能在一定程度上缓解有限频谱、系统容量和越来越高的通信要求之间的矛盾,因为,小区分裂和扇区化不能无限制进行下去,这会带来干扰、频繁切换等很多问题。 This network structure to improve the spectrum efficiency played a role, which is the conventional method for cell division and cell sectorization, however, this method can only alleviate the limited spectrum to a certain extent, the system capacity and higher and higher the contradiction between the communication requirements because of cell division and sector can not be unlimited continues, it will bring interference, frequent switching and many other issues.

[0003] 分布式天线系统是一种新的无线接入网络结构,它将基站和天线分离,利用光纤把基站信号传送到天线,然后发射到用户。 [0003] The distributed antenna system is a new radio access network architecture, it will be separated from the base station and the antenna, the base station transmits a signal to the antenna using an optical fiber, and then transmitted to the user. 与蜂窝结构相比,该系统把丰富的光纤资源作为无线通信的延伸部分,大量分布式天线更加靠近用户,用户周围的几条天线组成一个以终端用户为中心的小区,这样,天线和终端的发射功率可以大幅度降低,同时,可以大大提高频谱利用率和系统容量。 Compared with the honeycomb structure, the system resources as the fiber-rich part of the extension of wireless communication, the antenna closer to the large number of distributed users, around a few antennas in the center of the end user as a cell, so that the antenna of the terminal and transmit power can be significantly reduced, at the same time, can greatly improve the spectrum efficiency and system capacity.

[0004] 分布式天线系统中大部分的信号处理在基站中完成,基站中的载频信号与分布式天线之间存在着相对固定的关系,这就大大削弱了系统对突发业务高峰应急处理能力。 [0004] Most of the distributed antenna system a signal processed in the base station, there is a relatively fixed relationship between the carrier frequency signal in the base station with the distributed antenna system which greatly reduced the peak sudden emergency service ability. 例如,在某一区域内举行大型运动会,文艺演出等活动时,业务量激增,系统容量不能动态调整会导致用户掉话或无法接入。 For example, when holding large-scale games, theatrical performances and other activities in an area, the traffic surge, the system can not dynamically adjust capacity can lead to dropped calls or users can not access. 通常解决这类问题的方法是基站预留一定的无线资源,但是,这会大大增加运营商的设备投资。 The method usually solve such problems is to set aside a certain base station radio resources, however, it will greatly increase investment in equipment operators.

发明内容 SUMMARY

[0005] 本发明所解决的技术问题是提供一种基于中心化基站的无线接入系统,实现了虚拟载频的搬移和无线资源的动态配置。 [0005] The technical problem solved by the present invention is to provide a wireless access system based on the center of the base, to achieve dynamic configuration and move the virtual carrier frequencies of radio resources.

[0006] 技术方案如下: [0006] The technical solutions are as follows:

[0007] 一种基于中心化基站的无线接入系统,包括: [0007] Based on the center of the base of a wireless access system, comprising:

[0008] 中心化基站,用于将载频信号进行动态配置或者虚拟载频搬移,将所述载频信号调制和复用到光波上,并将所述光波长复用到光纤链路; [0008] The center of the base station, the carrier signal for dynamic configuration or move the virtual carrier frequency, the carrier frequency signals modulated on light waves and multiplexed, and the multiplexed optical wavelength fiber link;

[0009] 远端天线单元,通过光纤链路和所述中心化基站相连接,用于提取调制到光波链路的所述载频信号,经由发射天线发射到所覆盖的区域。 [0009] The remote antenna unit is connected by an optical fiber link and the center of the base station, for extracting the optical wave modulated onto carrier frequency link signal, transmitted to the area covered by the transmitting antenna.

[0010] 优选的,所述光纤链路包括依次相连接的WDM环网、全光纤环形网、OADM光节点和光纤支路。 [0010] Preferably, the optical fiber WDM ring network comprising a link connected sequentially, all-fiber ring network, an OADM optical node and an optical fiber branch.

[0011] 优选的,所述的远端天线单元包括光纤链路接口单元、射频前端和天线系统;所述光纤链路接口单元用于将光纤链路上的光波下载到RAU,或者,将RAU接收到的上行电信号转变为光信号,发送到光纤链路中去;射频前端用于将下行的基带信号调制为射频信号,或者将上行的射频信号下变频为基带信号形成射频信号,所述天线系统用于将射频信号发送出去。 [0011] Preferably, the remote antenna unit includes an optical fiber link interface unit, RF front end and antenna system; the optical fiber link interface unit for downloading the lightwave fiber link to RAU, or the RAU an uplink received electrical signal into an optical signal, transmitted to the optical fiber link; a radio frequency front end for the downlink baseband signal is modulated to a radio frequency signal or radio frequency signal forming the uplink frequency RF signals to a baseband signal, said the antenna system for a radio frequency signal transmitted.

[0012] 优选的,所述中心化基站包括: [0012] Preferably, the center of the base station comprising:

[0013] 基带处理单元,用于将载频信号转变为中频或者射频信号,并发送; [0013] The baseband processing unit, configured to change the carrier frequency to an intermediate frequency signal or radio frequency signal and transmitted;

[0014] 射频交叉连接单元,用于将所述中频或者射频信号路由到副载波调制单元; [0014] RF cross-connect unit for connecting the radio frequency or intermediate frequency signal is routed to the subcarrier modulation section;

[0015] 副载波调制单元,用于使所述中频或者射频信号的频率产生移频形成调制频率, 并将所述调制频率复用到一路光波长上,调制过程受频移键控单元监控; [0015] sub-carrier modulation means for causing said intermediate frequency or radio frequency signals generated frequency shift modulation frequency is formed, and the modulation frequency multiplexed on one optical wavelength, frequency shift keying modulation process by the monitoring means;

[0016] 光交叉连接单元,用于将光波长路由到波分复用单元; [0016] The optical cross-connect unit for optical wavelength routed to wavelength division multiplexing unit;

[0017] 波分复用单元,用于完成光波长到所述光纤链路的复用; [0017] The wavelength division multiplexing unit for performing optical wavelength multiplexing to the optical fiber link;

[0018] 控制维护单元,用于系统的管理和维护,以及用于虚拟载频搬移时对各模块进行协同处理; [0018] control the maintenance unit, a system for the management and maintenance, as well as for co-processing modules to move the virtual carrier frequency;

[0019] 频移键控单元,用于检测副载波调制单元调制的准确性。 [0019] Frequency Shift Keying means, for detecting the subcarrier modulation unit accuracy.

[0020] 优选的,所述频移键控单元接收所述控制维护单元中所述副载波调制单元的频率调制信息;所述频移键控单元检测副载波调制单元调制后的载波频率信息,将其与所述控制维护单元中的副载波调制单元的调制信息对比,两者一致说明SCM调制正确,反之,说明SCM调制后的载波频率存在错误或误差。 [0020] Preferably, the means for receiving the frequency shift keying modulation frequency control information unit maintains the subcarrier modulation unit; carrier frequency of the FSK information unit detects subcarrier modulation unit, the maintenance information with the contrast modulation control unit subcarrier modulation unit, both described SCM same modulation correctly, otherwise, have an error or an error of the carrier frequency modulated SCM.

[0021] 优选的,所述基带处理单元包含基带池,并与所述射频交叉连接单元动态连接。 [0021] Preferably, the baseband processing unit comprises a base band, and is connected with the radio frequency unit dynamically cross-connect.

[0022] 优选的,所述副载波调制单元具有至少一个光波长输入端口和至少一个光波长输出端口;所述的射频交叉连接单元用于完成所述中频或射频信号的交叉连接,将载频信号路由到所述副载波调制单元的不同光波长输入端口上;所述的副载波调制单元用于将载频信号移频后调制和复用到一路光波长上,并通过不同的光波长输出端口发送。 [0022] Preferably, the subcarrier modulation section having at least one wavelength of light input port and output port of the at least one optical wavelength; the radio frequency unit for performing cross-connect cross-connect the radio frequency signal or an intermediate frequency, carrier frequency different optical wavelength signals are routed to the input port of the subcarrier modulation section; said subcarrier modulation section for the carrier signal is frequency modulated frequency shift and multiplexed onto one optical wavelength, and through the different wavelengths of light output port to send.

[0023] 优选的,所述光交叉连接单元根据业务需要将不同的光波长路由到不同的波分复用单元,实现光波长的动态分配。 [0023] Preferably, the optical cross-connect unit according to the service needs of different wavelengths are routed to different light wavelength division multiplexing unit, dynamic allocation of wavelength of light.

[0024] 本发明所解决的另一个技术问题是提供一种基于中心化基站的载频搬移方法,实现了虚拟载频的搬移和无线资源的动态配置。 [0024] Another technical problem solved by the present invention to provide a method of moving a carrier frequency, to achieve dynamic configuration of the center of the virtual carrier frequencies of the base station and the radio resource based on moving.

[0025] 技术方案如下: [0025] The technical solutions are as follows:

[0026] 一种基于中心化基站的载频搬移方法,包括: [0026] Based on the center of the base station carrier frequency shift, comprising:

[0027] (1)中心化基站将载频信号进行动态配置或者虚拟载频搬移,然后将所述移频后的载频信号调制和复用到光波上,并路由到不同的远端天线单元; [0027] (1) the center of the base station carrier signal for dynamic configuration or move the virtual carrier frequency, then the frequency shifted carrier frequency signal is modulated and multiplexed onto the optical wave, and routed to different remote antenna unit ;

[0028] (2)所述远端天线单元提取调制到光波上的所述载频信号,经由发射天线发射到所覆盖的区域。 [0028] (2) the remote antenna unit extracts a modulated onto the lightwave carrier signal, transmitted to the area covered by the transmitting antenna.

[0029] 进一步,步骤(1)中,在虚拟载频搬移时采用临近原则,在所述临近原则中优先考虑搬移副载波调制后频率相近的载频信号,然后考虑搬移临近光波长上的载频信号,最后考虑搬移临近光纤链路上的载频信号。 [0029] Further, the step (1), near the principles employed when the virtual carrier frequency shift, the priority subcarrier modulation frequency is moved close to the adjacent carrier frequency signal in principle, consider the load on the then move near the wavelength of light frequency signal, and finally considering moving near the carrier frequency signal on the optical fiber link.

[0030] 进一步,步骤(1)中,所述虚拟载频搬移的步骤包括: [0030] Further, the step (1), the virtual carrier moving step comprises:

[0031] (11)对映射关系表进行初始化和更新; [0031] (11) to initialize the mapping table and updated;

[0032] (12)改变载频信号与副载波移频频率的映射关系,使所述载频信号产生移频形成调制频率,并将所述调制频率调制并复用的一路光波长上;在移频、调制和复用过程中遵守所述映射关系表; [0032] (12) changes the carrier frequency signal and a subcarrier mapping relationship between frequencies of the shift, the frequency shift of the carrier frequency signal generating modulation frequency is formed, and on the way of the modulated optical wavelength multiplexing and frequency modulation; in frequency shift modulation and multiplexing process in compliance with the mapping table;

[0033] (13)将所述光波长复用到光纤链路,在复用过程中,遵守所述射关系表。 [0033] (13) the wavelength multiplexed optical fiber link, in the multiplexing process, comply with the exit table.

[0034] 进一步,步骤(11)中,所述射关系表包括载频信号列表、移频频率列表、调制频率列表、光波长列表、交叉连接光波长列表、波分复用列表、光纤链路列表。 [0034] Further, the step (11), said table comprising a radio frequency carrier signal list, a list of frequencies shift, the modulation frequency list, a list of the wavelength of light, an optical wavelength cross-connection list, a list of wavelength division multiplexing, optical fiber links list.

[0035] 进一步,步骤(11)中,配置所述映射关系表时,避免一个光波长上承载两个或两个以上的同频无线载波信号,或者避免在一条光纤上承载两条或两条以上相同的光波长。 [0035] Further, the step (11), when configuring the mapping relationship table, to avoid a light carrying two or more radio-frequency carrier signal with a wavelength, or to avoid two or carrying on a two fiber over the same wavelength of light.

[0036] 进一步,步骤(1¾中,射频交叉连接单元通过调用所述载频信号列表,将所述载频信号路由到副载波调制单元;副载波调制单元调用所述移频频率列表、调制频率列表和光波长列表,将所述载频信号与副载波调制单元中的移频频率作用,产生调制频率,然后将该调制频率调制并复用到光波长上;步骤(1¾中,光交叉连接单元调用交叉连接光波长列表,将承载着载频信号的光波长进行光波长的交叉连接,并发送;波分复用单元调用波分复用列表,将所述光波长复用到光纤链路上。 [0036] Further, the step (1¾, the RF carrier frequency of the cross-connect unit list by calling signal, the carrier signal is routed to the subcarrier modulation section; subcarrier modulation section shift frequencies of the call list, the modulation frequency list and a list of the wavelength of light, the carrier frequency signal with a frequency shift of subcarrier modulation effect unit, the modulation frequency is generated, and then the modulation frequency multiplexed optical wavelengths; step (1¾, the optical cross-connect unit optical wavelength cross-connect call list, the optical wavelength carrying the carrier signal is optical wavelength cross-connect and transmission; WDM wavelength division multiplexing unit call list, to multiplex the optical wavelength fiber link .

[0037] 本发明提出的提出基于中心化基站的无线接入系统继承了分布式天线系统的优点,提高了频谱利用率和系统容量,同时,实现了虚拟载频搬移和无线资源动态配置的功能。 [0037] proposed by the present invention a wireless access system based on the center of the base inherits the advantages of a distributed antenna system, improve the spectral efficiency and system capacity, while achieving the function of dynamic configuration of the virtual carrier frequency shift and a radio resource . 中心化基站集中了所有载频资源,基带信号处理和大部分射频处理都在中心化基站内完成,射频交叉连接单元、副载波调制单元、光交叉连接单元和WDM单元完成对载频信号到光波的调制、载频信号路由和光波路由功能,实现了不改变中心化基站硬件的情况下,根据业务需求动态配置载频和调整无线资源。 Center of base stations that are all the carrier frequency resource, the baseband signal processing and the majority of RF processing is done in the center of the base station, the radio frequency cross connects, subcarrier modulation unit, the optical cross-connect unit and the WDM unit completes the carrier frequency signal to the lightwave modulation lightwave carrier signal routing and routing functions realized without changing the hardware of the center of the base station, service requirements and dynamically configured to adjust the carrier frequency according to the radio resources.

[0038] 射频交叉连接单元、副载波调制单元、光交叉连接单元完成了载频信号到不同远端天线单元的路由功能,实现了虚拟载频搬移和无线资源动态配置,能够解决突发高峰业务对网络的需求。 [0038] RF cross-connect unit, the subcarrier modulation section, the optical cross-connect unit complete routing carrier frequency signals to different remote antenna unit, realized virtual carrier frequency shift and the dynamic radio resource configuration, it is possible to solve the peak traffic burst demand on the network. 基于中心化基站的无线接入系统实现了网络资源配置的优化,降低运营商的设备投资。 A wireless access system based on the center of the base station is achieved optimal allocation of network resources, reducing the investment in equipment operator. 由于虚拟的载频搬移功能,整个网络的载频无须按最大话务量配置,而只需要按平均话务量配置,从而大大节省投资。 Since the virtual carrier frequency shift function, the entire network is the largest carrier by traffic without configuration, while the average traffic simply press configuration, thus saving investment. 另外,由于远端天线单元设备大大简化,增强了系统健壮性,可实现免维护,节省了维护成本。 Further, since the remote antenna unit greatly simplifies the device, enhance system robustness, maintenance-free, saving maintenance costs.

[0039] 在基于中心化基站的无线接入系统中,中心化基站维护容易、扩容方便;WDM光纤网络安全可靠,频率资源丰富;远端天线单元硬件设备简单、容易安装、健壮性好,可实现免维护。 [0039] In a wireless access system based on the center of the base, the center of the base station is easy to maintain, easy expansion; secure the WDM optical network, abundant frequency resources; simple hardware remote antenna unit, easy to install, good robustness, maintenance-free. 虚拟载频搬移技术大大节省运营商的投资,整个系统可以承载多种制式的无线接入系统,如GSM,CDMA, UMTS, BffA, WiMAX 禾口WLAN 等。 Virtual carrier frequency shift technology saves investment of the operator, the system can carry a variety of standard wireless access systems, such as GSM, CDMA, UMTS, BffA, WiMAX Wo mouth such as WLAN.

附图说明 BRIEF DESCRIPTION

[0040] 图1是基于中心化基站的无线接入系统的网络结构示意图; [0040] FIG. 1 is a schematic diagram of a network structure of the wireless access system based on the center of the base station;

[0041] 图2是中心化基站逻辑模块结构示意图; [0041] FIG. 2 is a schematic diagram of the central station logic module structure;

[0042] 图3是远端天线单元结构示意图; [0042] FIG. 3 is a schematic view of the structure of the remote antenna units;

[0043] 图4是中心化基站系统结构图; [0043] FIG 4 is a configuration diagram of a centralized base station system;

[0044] 图5是中心化基站虚拟载频搬移示意图。 [0044] FIG. 5 is a virtual center of the base station carrier frequency schematic move.

具体实施方式 Detailed ways

[0045] 本发明提出的基于中心化基站的无线接入系统继承了分布式天线系统的优点,提高频谱利用率和系统容量,同时,实现了虚拟载频搬移和无线资源动态配置的功能。 [0045] The present invention proposes a wireless access system based on the center of the base inherits the advantages of a distributed antenna system, spectrum efficiency and system capacity, while achieving the function of dynamic configuration of the virtual carrier frequency shift and a radio resource.

[0046] 基于中心化基站的无线接入系统在城域范围内仅设一个大容量中心化基站(CB, Centralized BTS)和若干远端天线单元(RAU,Remote AntennaUnit),两者通过光纤相连接,共同组成一个城域天线分布网路(DAN,Distributed Antenna Network)。 [0046] wireless access system based on the center of the base stations in the metropolitan area of ​​a large capacity is provided only the center of the base (CB, Centralized BTS) and a plurality of remote antenna unit (RAU, Remote AntennaUnit), both connected by an optical fiber , together form a metropolitan area distributed antenna network (DAN, distributed antenna Network). 中心化基站通过光纤把中频或射频信号传送到分布式的远端天线单元,再通过远端天线单元的天线把载频信号发射到覆盖区域。 The base station transmits through the center of the optical fiber or radio frequency signals to intermediate frequency distributed remote antenna unit, the carrier frequency signal and then transmitted to the coverage area of ​​the remote antenna unit via the antenna. 中心化基站(CB)集中了所有载频资源,基带信号处理和大部分射频处理都在中心化基站内完成,通过对载频信号到光波的调制、载频信号路由和光波路由功能,实现了虚拟载频搬移和无线资源动态配置,解决了突发高峰业务对网络的需求。 Centralized base station (CB) accumulates all the carrier frequency resource, the baseband signal processing and the majority of RF processing are done in a centralized base station by the carrier frequency signal to a modulated optical wave carrier frequency signal routing and light wave routing function, to achieve a move virtual carrier frequency and radio resources dynamically configured to address the unexpected peak traffic demand on the network.

[0047] 下面参照附图,对本发明的优选实施例作详细描述。 [0047] Preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0048] 如图1所示,在一个较大的地理区域或城域范围内,基于中心化基站的无线接入系统包括一个中心化基站(CB,Centralized BTS)和若干远端天线单元,CB与RAU之间通过光纤链路相连接,组成分布式城域天线网络。 [0048] As shown, in a large geographic area or metropolitan area, a wireless access system based on a centralized base station of a central base station (CB, Centralized BTS) and a plurality of remote antenna unit 1, CB It is connected to a fiber optic link between a RAU and form a distributed antenna network MAN. 光纤链路包括WDM环网(WDM all fiber ring)、全光纤环形网、0ADM(optical add-drop multiplexer)光节点和光纤支路。 WDM link comprises a fiber optic ring network (WDM all fiber ring), all-fiber ring network, 0ADM (optical add-drop multiplexer) optical node and an optical fiber branch. 远端天线单元通过光接口(在此光接口选用FC)下载OADM节点处的光纤链路上的光波长,进行光电转换,然后,通过带通滤波器提取调制到光波上的载频信号,并进行变频等处理,最后经过天线完成载频信号的发射。 Remote antenna units via the optical interface optical wavelength (optical interface selected here FC) downloaded over a fiber optic link at the OADM node, performs photoelectric conversion, is then extracted through a bandpass filter to the carrier frequency modulated lightwave signal, and processing such as frequency conversion, and finally through an antenna to complete the transmit carrier frequency signal. 上行方向,RAU接收终端的信号,经过下变频和滤波后,将信号转换为光信号,在经过EDFA放大,通过光纤链路传输到CB中,进行解调等处理。 The upstream direction, the RAU reception signal terminal, after downconversion and filtering, the signal is converted to an optical signal, after amplification EDFA, the CB transmission optical fiber link, performs demodulation processing and the like.

[0049] 在下行方向,光纤链路接口单元从光纤链路中下载某个或某些光波长,并通过PD (光电二极管)将光信号转变为电信号。 [0049] In the downstream direction, a fiber optic link to download the interface unit or certain wavelengths of light from an optical fiber link, and by a PD (photodiode) optical signals into electrical signals. 带通滤波器BPF从电信号中滤出RAU需要的载波信号,然后经过混频器的上变频处理和功率放大器的放大处理,从天线发射出去;上行方向,RAU从天线接收无线信号,经过低噪声放大器放大后,载经过混频器调谐选波和带通滤波器的滤波处理,得到上行射频电信号,LD(激光二极管)将电信号转变为光信号,并调制到光波上,最后通过光纤链路发送到CB。 A band-pass filter BPF filter out the electric signal from the carrier signal RAU need, then subjected to up-conversion processing and amplification processing of the mixer amplifier, transmitted from the antenna; uplink, RAU receive wireless signals from the antenna, through the low after noise amplifier, the mixer through the carrier tuned filtering process selected from the waves and a band pass filter, a radio frequency electrical signal to the uplink, the LD (laser diode) an optical signal into an electrical signal and to modulate the light, and finally through the optical fiber link transmission to the CB.

[0050] RAU结构简单,射频前端和天线系统仅与频率有关,因此,采用不同射频前端和天线系统就可以支持不同无线制式,如GSM、CDMA、UMTS、WLAN、BffA, WiMAX等。 Simple [0050] RAU structure, only the RF front end and antenna system frequency, and therefore, different RF front end and antenna system can support different wireless standards, such as GSM, CDMA, UMTS, WLAN, BffA, WiMAX and the like. 采用宽带的射频前端和天线系统可以同时支持多种无线制式。 A broadband RF front end and antenna systems can simultaneously support multiple wireless standards.

[0051] 在传统的蜂窝网络结构中,一个基站负责一个或几个小区,在城域范围内或较大的地理区域内需要多个基站完成全面覆盖。 [0051] In conventional cellular network architecture, a base station is responsible for one or more cells, a plurality of base stations needed to complete the full coverage within the metropolitan area, or a large geographical area. 与之相比,中心化基站相当于将所有基站资源集中在一起,形成一个大容量的基站,远端天线单元负责覆盖一个小的区域,多个远端天线单元形成分布式的覆盖网络。 In contrast, the base station corresponding to the center of the base concentrate all resources together to form a large capacity of the base station, the remote antenna unit is responsible for covering a small area, a plurality of remote antenna units forming the distributed overlay network. 远端天线单元通过WDM光纤网连接到中心化基站,在光网络节点OADM处下载不同的光波长,然后通过光纤支路向远端天线单元分配承载在该波长上的无线载波信号。 Remote antenna units are connected by an optical fiber WDM network to a centralized base station, download different light wavelengths of the light at the OADM node network, and the wireless carrier signal carrying the wavelength assigned to the remote antenna units through an optical fiber branch.

[0052] 下行方向,所有的载频信号均由一个中心化基站发出,经过光纤传送到所述的远端天线单元,远端天线单元将信号解调后,经由发射天线发射到所覆盖区域,上行方向过程与之相反。 [0052] downlink, all of the carrier frequency signal sent by a centralized base station, transmitted through the optical fiber to the distal end of the antenna unit, the remote antenna unit demodulates the signal, transmitted to the coverage area via a transmitting antenna, process upstream direction opposite thereto.

[0053] 如图2所示,中心化基站(CB)的主要包括基带处理单元(BBU,BaseBand Unit)、 射频交叉连接单元(RXC,Radio Cross-Connection)、副载波调制单元(SCM,Sub-Carrier Multiplexing)、光交叉连接单元(0XC, OpticalCross-Connection)、波分复用单元(WDM, Wavelength DivisionMultiplexing)、控制维护单元(CMM, Control MaintenanceModule)、频移键控单元(FSK,Frequency Shift key)。 [0053] As shown, the center of the base (CB) comprises a main baseband processing unit (BBU, BaseBand Unit), radio-frequency cross connects (RXC, Radio Cross-Connection), subcarrier modulation section (SCM, Sub- 2 Carrier Multiplexing), optical cross-connect unit (0XC, OpticalCross-connection), wavelength division multiplexing unit (WDM, Wavelength DivisionMultiplexing), the maintenance control unit (CMM, control MaintenanceModule), frequency shift keying means (FSK, frequency shift key) .

[0054] FSK主要负责SCM调制的监控工作,CMM将SCM的频率调制信息,例如载波的频点、 相邻载波的频带宽度等,发送给FSK ;FSK检测调制后的载波频率信息,将其与CMM的SCM调制信息对比,两者一致说明SCM调制正确,反之,说明SCM调制后的载波频率存在错误或误差。 [0054] responsible for SCM control work FSK modulation, frequency modulation information of the CMM of SCM, such as carrier frequency, band width, adjacent carriers, to a FSK; carrier frequency information of the FSK modulation detection, with which SCM comparison of the CMM modulation information, consistent with both the SCM described modulation correctly, otherwise, have an error or an error of the carrier frequency modulated SCM. 通过FSK可以监控SCM调制的准确性。 You can monitor the accuracy of the SCM modulated by FSK.

[0055] 其中,基带处理单元(BBU,Base Band Unit)主要用于完成所有载频信号的基带处理和部分射频处理,包括基带处理模块和射频处理模块。 [0055] wherein the baseband unit (BBU, Base Band Unit) is mainly used to process all of the RF and baseband carrier frequency signal, comprising a baseband processing module and RF processing module. 基带处理模块以资源共享方式工作,即基带处理模块形成一个资源池,与射频处理模块动态连接,从基带处理单元输出的是模拟中频或射频信号。 The baseband processing module operates in resource sharing, i.e., the baseband processing module form a pool of resources, dynamic link RF processing module, output from the baseband processing unit is an analog intermediate frequency or radio frequency signals. 射频处理模块主要作用是将下行的基带信号调制为射频信号,或者将上行的射频信号下变频为基带信号。 The main role of the downlink RF processing module is a baseband signal modulated radio frequency signal, or radio frequency signals to baseband uplink signals.

[0056] 射频交叉连接单元(RXC,Radio Cross-Cormection),完成模拟中频或射频信号到副载波调制单元(SCM)的路由功能。 [0056] RF cross-connect unit (RXC, Radio Cross-Cormection), or complete analog IF to RF signal routing subcarrier modulation section (SCM) is. 副载波调制单元(SCM)包括移频模块、调制和复用模块,其中,移频模块的作用是使输入的载频信号频率产生移频,具有不少于载频信号个数的本地调制频率;调制和复用模块将一路或多路经过移频的载频信号调制到光波长上,调制过程受FSK监控。 Subcarrier modulation section (SCM) comprises a frequency shift module, modulation and multiplexing module, wherein the module is to shift the role of the input frequency carrier signal frequency to produce a frequency shift, the modulation frequency having a local carrier frequency less than the number of signals ; modulation and multiplexing module through one or more branches the modulated carrier signal to the frequency shift of the wavelength of light, by FSK modulation process monitoring. 光交叉连接单元(0XC,Optical Cross-Connection)完成不同光波长到WDM单元的交叉连接功能。 Optical cross connects (0XC, Optical Cross-Connection) Different wavelengths of light to complete the function of WDM cross-connect unit. 波分复用单元(WDM,Wavelength DivisionMultiplexing)完成光波长到光纤链路的复用功能。 Wavelength division multiplexing unit (WDM, Wavelength DivisionMultiplexing) to complete the optical fiber link to a wavelength multiplexing function.

[0057] 控制维护单元(CMM,Control Maintenance Module),负责CB系统的管理和维护, 对各个模块进行配置、监控、故障处理等。 [0057] control the maintenance unit (CMM, Control Maintenance Module), is responsible for managing and maintaining the system CB, each module configuration, monitoring, fault handling. 特别是负责虚拟载频搬移时各个模块的协同处理,例如射频信号的交叉互联、SCM调制管理、光交叉模块波长路由管理等。 Especially when the co-processing of each module is responsible for moving the virtual carrier frequency, for example, cross-connects a radio frequency signal, SCM management modulated, wavelength routing optical cross-connect module management.

[0058] 在CB内部存在着射频信号的交叉连接、射频信号频移处理、移频信号到光波的调制复用、光信号的交叉连接等多种过程。 [0058] The cross-connection within the radio frequency signal is present in the CB, the RF signal processing frequency shift, frequency shift modulation lightwave signal to multiplexing, cross-connect optical signals and other processes. 为了合理配置和管理CB,在CMM或基于中心化基站接入网络的网管系统内存储映射关系表T,该射关系表T包括以下参数列表: In order to properly configure and manage CB, the CMM or the network management system based on centralized access network base station storage mapping table T, the exit table T comprising a list of parameters:

[0059] 载频信号列表&,载频信号是指BBU输出的模拟中频或射频信号,η为载频信号序号; [0059] & listing carrier signal, the carrier frequency of the analog IF signal or the RF means output signal BBU, [eta] is the number of carrier frequency signals;

[0060] 副载波调制单元的移频频率列表fn,移频频率使载频信号发生频移,得到副载波调制频率列表,η为移频频率的序号; [0060] The shift unit subcarrier modulation frequencies Fn list, frequency shifting the carrier frequency signal of a frequency shift, to obtain a list of subcarrier modulation frequency, [eta] is the shift number of frequencies;

[0061] 副载波调制单元的调制频率列表fsn,fsn与fn —一对应,sn为调制频率的序号; Modulation frequency list fsn [0061] subcarrier modulation unit, fsn and fn - one correspondence, sn is the number of modulation frequencies;

[0062] 光波长列表λ m,m为光波长的序号; [0062] List light wavelength λ m, m is the number of wavelengths of light;

[0063] 交叉连接光波长列表λ sm,是光波长λ m经过光交叉连接单元后输出的光波,sm为光波长序号; [0063] The light wavelength cross-connection list λ sm, λ m is the wavelength of light through the light waves output from the optical cross-connect unit, sm ID wavelength of the light;

[0064] WDM列表WDM1, 1是WDM单元的序号; [0064] WDM list WDM1, 1 is the number of WDM unit;

[0065] 光纤链路列表Lk,k为光纤链路序号,WDM单元与光纤链路一一对应; [0065] The fiber optic link list Lk, k is the serial link fiber, WDM fiber links one correspondence with the unit;

[0066] 远端天线单元ID列表I?p,p为远端天线单元ID号,远端天线单元与光纤链路存在固定连接关系。 [0066] The remote antenna unit ID list I? P, p is a remote antenna unit ID number, there is a fixed connection relationship with the distal end of the fiber link antenna units.

[0067] 参数列表的映射关系表T,反映了中心化基站接入系统的无线资源配置情况。 [0067] The mapping table lists the parameter T, reflecting the radio resource configuration of the central station of an access system. 它包含了&中的载频信号到4中移频频率的路由关系,fsn到λω的调制和复用关系,λ„^Ι」 的交叉连接关系,λ Sffl到WDM1的复用关系,WDM1与Lk的对应关系,光纤链路Lk到远端天线单元&的连接关系。 It contains the carrier frequency signal & in to 4 shift routing relationships frequency rate, fsn to λω modulation and multiplexing relationship, λ "^ cross connection relation Ι" in, λ Sffl to WDM1 multiplexing relationship, WDM1 and the correspondence relationship Lk, Lk fiber link to a remote antenna unit & connection relationship. 映射关系表T最终建立了无线载频信号到远端天线单元映射关系。 Mapping table T finally established wireless carrier frequency signal to a remote antenna unit mapping relationship.

8[0068] 配置映射关系表时,必须避免两种情况:第一,一个光波长上承载两个或两个以上的同频无线载波信号;第二,是在一条光纤上承载两条或两条以上相同的光波长。 8 [0068] configuring the mapping table, two situations must be avoided: first, a light carrying two or more of the same radio frequency carrier signal wavelength; second, is carried on one or both of the two fiber light having a wavelength at or above the same. 为了达到这个目的,基于中心化基站的无线接入系统采取了合法性检查机制,在配置或更新映射关系表T之前,由CMM或网管系统对映射关系表进行审核,出现上述两种情况之一视为非法, 禁止资源配置。 For this purpose, a wireless access system based on the center of the base station validity check mechanism adopted, configured or updated before mapping table T, for review by a mapping table or CMM network management system, one of two things occurs above considered illegal, prohibited the allocation of resources.

[0069] 基于中心化基站的无线接入系统中,载频信号发射接收以及虚拟载频搬移通过下面过程实现: [0069] wireless access system based on the center of the base station, the carrier frequency signal transmission-reception carrier frequency and a virtual moving achieved by the following procedure:

[0070] 射频交叉连接单元通过调用载频信号列表,将载频信号路由到副载波调制单元;副载波调制单元调用移频频率列表fn、调制频率列表fsn和光波长列表λ m,将载频信号Sn与副载波调制单元中的移频频率fn作用,产生调制频率fsn,然后调制并复用到光波长λ m 上。 [0070] RF cross-connect unit by calling the carrier frequency signal list, the carrier signal is routed to the sub-carrier modulation section; subcarrier modulation section calls shift frequencies list Fn, the modulation frequency list fsn and light wavelength list λ m, the carrier signal Sn subcarriers shift modulation unit frequencies fn effect, produce a modulated frequency FSN, and then modulates the multiplexed optical wavelength λ m. 副载波移频频率列表fn中的频率数目不少于载频信号列表&中的载频信号数目,fn中的频率各不相同,目的是保证两者混频后产生的调制频率fsn各不相同。 Subcarrier frequencies shift frequency list number fn is not less than the number of carrier signal & listing carrier frequencies in the signal, the frequency fn is varied, the purpose is to ensure that the modulation rate fsn, produced after the two different mixing . 副载波到光波的复用符合载频信号列表&到光波长列表λ m的映射关系。 Sub-carrier multiplexing the light waves meet mapping relation m & listing carrier signal to the optical wavelength list λ. 通过软件控制可以使载频信号复用到不同的光波长上,从而实现载频信号在承载光波长上的搬移。 Can be made by software controlling the carrier frequency signal are multiplexed onto different optical wavelengths, in order to achieve the carrier frequency signals move on the carrier wavelength of light.

[0071] 光交叉连接单元调用交叉连接光波长列表Xsm,将承载着载频信号的光波长λω 进行光波长的交叉连接,输出光波长λ3ω。 [0071] The optical cross-connect cross-connect unit call list Xsm light wavelength, the light wavelength λω carrying carrier signal cross-connect is the wavelength of light, the output light wavelength λ3ω. 波分复用单元调用WDM列表WDM1,将Xsm复用到WDMi单元上,WDMi单元连接到光纤链路Lk上。 WDM wavelength division multiplexing unit call list WDM1, multiplexed onto the Xsm WDMi unit, WDMi unit is connected to the optical fiber link Lk. 通过软件控制可以使承载着载频信号的光波长复用到不同的WDM单元上,从而实现光波长在光纤链路的搬移。 Optical wavelength can be made carrying carrier signal multiplexed on different WDM unit via software control, thereby realizing the moving optical wavelength fiber link.

[0072] 光纤链路Lk与远端天线单元Ι?ρ存在固定的连接关系,光纤链路包括WDM全光纤环形网、OADM光节点和光纤支路(图1)。 [0072] The fiber optic link Lk and remote antenna units Ι? Ρ there is a fixed connection relationship, all-fiber optical WDM link comprising a ring network, an OADM branch optical node and the optical fiber (FIG. 1). 远端天线单元通过在OADM节点处下载光纤链路Lk 上的光波长Xsm,或者通过光接口(FC)下载经过放大的光波长Xsm,进行光电转换,然后,通过带通滤波器提取调制到光波上的载频信号,并进行变频等处理,最后经过天线完成载频信号的发射。 The remote antenna units by downloading the OADM node of the light wavelength on the optical fiber link of Lk Xsm, or download the amplified optical wavelength Xsm, by photoelectrically converting optical interface (the FC), and then, through a bandpass filter to extract the modulated optical wave the carrier frequency signal, and converting process, the final transmit carrier frequency via an antenna completion signal.

[0073] 在整个过程中,载频信号的交叉连接、变频、副载波调制、光信号的交叉连接和复用都严格遵守参数映射关系表Τ,以保证无线载频信号收发以及载频搬移的正确性。 [0073] Throughout the process, the carrier frequency cross-connection signal, frequency conversion, sub-carrier modulation, cross-connect optical signals and multiplexed strict compliance parameter map table Τ, to ensure that a wireless carrier frequency signal transceiver and carrier frequency shift of correctness. 通过上述过程,中心化基站无线接入系统能够完成载频信号集中处理和分布式发射,更重要的是, 在不改变硬件配置的条件下,实现虚拟载频搬移,使基于中心化基站的无线接入系统成为动态分布式体系。 Through the above process, the central base station of a wireless access system to complete the carrier frequency signal emitted centralized processing and distributed, more importantly, without changing the hardware configuration conditions, move virtual carrier frequency, so that the radio base station based on the center of the access system into a dynamic distributed system.

[0074] 另外,为了降低系统对设备的技术复杂度的要求,特别是降低远端天线单元中滤波器和WDM环网中OADM的性能要求,在虚拟载频搬移时,采用临近原则,即优先考虑搬移副载波调制后频率相近的载频信号,然后考虑搬移临近光波长上的载频信号,最后考虑搬移临近光纤链路上的载频信号。 [0074] Further, in order to reduce the complexity of the system requirements for technical equipment, in particular to reduce the performance requirements of the remote antenna unit and the WDM filter of the OADM ring network, when the virtual moving carrier using near the principle that priority after considering subcarrier modulation frequency is moved close to the carrier frequency signal, and then move near the carrier frequency signal considering the wavelength of light, and finally considering moving carrier signal on adjacent fiber optic links.

[0075] 如图3所示,远端天线单元主要用于完成光/电转换(PDJhoto Detector)/(LD, Laser Diode),主要包括光纤链路接口单元、射频前端和天线系统(Antenna)等。 [0075] 3, the remote antenna unit is mainly used optical / electric converter (PDJhoto Detector) / (LD, Laser Diode), an interface unit including a fiber optic link, a radio frequency front end and an antenna system (Antenna) and the like . 光纤链路接口单元负责将光纤链路上的光波下载到RAU,或者,将RAU接收到的上行电信号转变为光信号,发送到光纤链路中去。 Optical fiber link interface unit is responsible for downloading the lightwave fiber link to the RAU, or the RAU received uplink electrical signal into an optical signal, transmitted to the optical fiber link. 光纤链路接口单元包含光环行器、光电二极管(PD)、激光二极管(LD)、光纤放大器(EDFA)等器件。 Fiber link interface unit comprises an optical circulator, a photodiode (the PD), a laser diode (the LD), an optical fiber amplifier (EDFA) and other devices. 射频前端用于将下行的基带信号调制为射频信号,或者将上行的射频信号下变频为基带信号,包括滤波器(BPF)、混频器、功率放大器(PA)JS 噪声放大器(LNA)等。 It modulates the baseband signals to RF front end for a radio frequency downlink signal, or a radio frequency uplink signal to baseband signal, comprising a filter (the BPF), a mixer, a power amplifier (PA) JS-noise amplifier (LNA) and the like. 天线系统用于发送或者接收射频信号。 The antenna system for transmitting or receiving radio frequency signals. [0076] 为了节省光纤链路,避免载频信号收发之间产生较大时延,中心化基站和远端天线单元都利用光环形器将一路载频的收发信号复用到一条光纤链路上。 [0076] In order to save the fiber link, to avoid a large time delay between the carrier frequency signal transceiver, the center of the base station and remote antenna units transmit and receive signals using the optical circulator along the carrier frequency multiplexed onto a fiber optic link .

[0077] 参照图4所示,对中心化基站的系统结构以及载频信号在中心基站内的处理流程作详细描述。 [0077] Referring to FIG. 4, the system configuration of the base station and the center of the carrier frequency signal processing flow in the center of the base station described in detail.

[0078] 基带处理单元(BBU)内部形成一个完成基带处理的资源池,动态处理载频信号, 从基带处理单元(BBU)输出的是模拟中频或射频(IF/RF)信号。 [0078] The base band unit (BBU) to form a complete internal baseband resource pool, dynamics carrier signal from the baseband processing unit (BBU) output is an analog intermediate frequency or radio frequency (IF / RF) signal. IF/RF信号输入到RXC 单元,在RXC内IF/RF信号可以从输入端口路由到不同输出端口。 IF / RF signal is input to RXC means RXC in the IF / RF signal may be routed from the input port to different output ports. 然后,IF/RF信号进入SCM单元,SCM内本地移频频率对载频信号进行移频处理,得到SCM调制频率,接着,将移频后的载频信号调制复用到光波长上,为了确保远端天线单元能够正确解调载频信号, 这里需要保证承载到同一波长上的调制频率各不相同,SCM单元中包括光电二极管(PD, Photo Detector)、激光二极管(LD,Laser Diode)、下行关口滤波器(PFDL,pass filter of downlink) 0光波信号进入CKC单元,在CKC单元内,光波长进行交叉连接,目的是使每路光波长都能够从OXC的不同输出端口输出。 Then, IF / RF signal into the SCM unit, the frequency shift of the local SCM carrier frequency signal is frequency shifted to give SCM modulation frequency, then shifting the modulated carrier frequency signal of frequency multiplexed optical wavelengths, in order to ensure remote antenna units can be correctly demodulated carrier signal, where the need to ensure that the carrier frequency is modulated on the same wavelength varies, SCM unit includes a photodiode (PD, Photo Detector), a laser diode (LD, laser diode), downlink pass filter (PFDL, pass filter of downlink) 0 CKC lightwave signal into the cell, in the CKC unit, the optical wavelength cross-connector, so that each object is light having a wavelength channel can be different from the output ports of the OXC. OXC输出端口与WDM直接连接,WDM把输入的光波长复用到光纤链路上,经光放大后发送到远端天线单元。 OXC output port directly connected to the WDM, the WDM light input wavelength multiplexed onto the fiber link, sent to the remote antenna unit after the optical amplification. 在OXC和WDM单元内,必须保证一个光纤链路中不能出现两路和两路以上相同的光波长。 In the WDM unit and OXC, one must ensure that the same two wavelengths of light and two or more optical fiber link can not occur. 上面所述的信号处理过程是在CMM 单元监控下完成的,并且满足参数映射关系表T的合法性要求。 The above signal processing is done in the CMM unit monitors, and satisfy the legitimacy request parameter mapping relationship table T.

[0079] 为了实现一路信号收发在一条光纤链路中实现,在一组负责收发的WDM单元后面加上一个光环形器。 [0079] In order to achieve one signal transceiver implemented in an optical fiber link, after the group is responsible for a WDM transceiver unit plus an optical circulator.

[0080] 在中心化基站内,载频信号被频分复用到光波长上,光波被波分复用到光纤链路上。 [0080] In the center of the base station, the carrier frequency signal is frequency-division multiplexed optical wavelengths, wavelength division multiplexed light wave to the optical fiber link. 这样,在光网络节点处用可调谐的OADM区分波长信号,在远端站远端天线单元通过滤波器区分并下载不同频率的无线载频信号,实现载频信号到远端天线单元的顺利传输。 Thus, the wavelength of the signal light to distinguish OADM node network with tunable remote antenna unit at the remote terminal to download the radio carrier frequency signals of different frequencies to distinguish by the filter, to realize the smooth transmission of the carrier frequency signal to a remote antenna units .

[0081] 基于中心化基站的无线接入系统能够在不改变硬件设备的情况下实现虚拟载频搬移,满足业务变化对无线资源配置的要求。 [0081] wireless access system of centralized base station can be moved in the virtual carrier frequency without changing the hardware to meet the requirements of the service change based on radio resource configuration.

[0082] 参照图5所示,对移频过程作详细描述。 [0082] Referring to FIG. 5, a frequency shift process is described in detail.

[0083] 本发明技术方案在不改变中心化基站硬件配置的情况下,通过中心化基站中的射频交叉连接单元、副载波调制单元、光交叉连接单元和WDM单元实现载频信号在不同远端天线单元之间的虚拟搬移。 [0083] In the aspect of the present invention without changing the hardware configuration of the center of the base, through the center of the cross-connect in the base station radio unit, the subcarrier modulation section, the optical cross-connect unit and the WDM unit is implemented in a different carrier frequency signal distal end move between virtual antenna elements.

[0084] 在初始配置时,中心化基站对载频信号列表&、副载波调制单元的移频频率列表fn、调制频率列表fsn、光波长列表λ m、交叉连接光波长列表λ sm、WDM单元列表WDM1、光纤链路列表Lk、远端天线单元列表以及各参数列表之间的映射关系表T进行初始化,映射关系表T存储在中心化基站的控制维护单元或网管系统中。 [0084] In the initial configuration, the center of the base of the WDM unit carrier frequency signal list & subcarrier modulator shift unit of the frequency rate list Fn, the modulation frequency list FSN, light wavelength list λ m, the cross-connect optical wavelength list λ sm, mapping table T between WDM1 list, a list of Lk fiber link, each remote antenna unit parameter list listing and initializing the mapping table T storage NMS or the maintenance unit in the control center of the base station. 参数列表符号的脚标n、sn、m、1、k 和P分别代表列表中参数序号,映射关系表反映了各列表之间参数的对应关系。 The subscript n parameter list symbol, sn, m, 1, k and P represent the parameter list number, a mapping relationship table reflects a correspondence relationship between the parameter list.

[0085] 虚拟载频搬移之前,中心化基站的控制维护单元或网管系统计算并更新所述的列表和映射关系表,保证避免一个光波长上承载两个及两个以上的相同的副载波频率,避免一条光纤上承载两个及两个以上相同的光波长。 [0085] The virtual carrier before moving, the control center or a maintenance unit of the base station calculates and updates the network management system and the mapping relationship table of the list, to ensure an optical carrier to avoid the same subcarrier frequency, and two or more of the two wavelengths , to avoid an optical wavelength carrying the same for two or more optical fibers. 根据新的所述列表和映射关系表实施虚拟载频搬移。 The embodiment of the new table listing carrier frequencies and mapping between virtual move.

[0086] 载频信号&通过射频交叉连接单元路由到副载波调制单元,与副载波调制单元中的移频频率fn作用,产生副载波调制频率fsn,然后调制并复用到光波长λω上。 [0086] & RF carrier signal is routed through the cross-connect unit subcarrier modulation section, and the sub-carrier modulation section shift frequencies fn in effect, to produce the subcarrier modulation frequency FSN, and then modulates the multiplexed optical wavelength λω. 载频搬移时,通过改变载频信号&与副载波移频频率fn的映射关系实现载频信号在不同承载光波长上的搬移。 Moving the carrier frequency, the carrier frequency by changing the subcarrier signal & shift mapping relationship between frequencies fn move to achieve carrier frequency signal carrying light at different wavelengths. 承载着载频信号的光波长λ 1]1通过光交叉连接单元后输出光波长为Xsm,入皿连接到WDM1单元上,然后,经过WDM1复用到光纤链路Lk上。 Carrying carrier signal light wavelength λ 1] 1 by the optical cross-connect unit outputs light having a wavelength of Xsm, the WDM1 unit is connected to the dish, and then, after the multiplexed optical fiber link WDM1 Lk. 虚拟载频搬移时,通过控制光交叉连接单元改变光波长入„]与Xsm之间的交叉连接关系,就可以实现光波长在光纤链路的搬移。 Move the virtual carrier frequency, by controlling the optical cross-connect means to change the wavelength of light "] the relationship between the cross-connect and Xsm, move to the light wavelength in the optical fiber link can be achieved.

[0087] 光纤链路Lk与远端天线单元Ι?ρ存在对应关系,远端天线单元能够识别并解调Lk上的载频信号,处理后发射到覆盖区域。 [0087] The fiber optic link Lk and remote antenna units Ι? Ρ there is a correspondence relationship, remote antenna unit can recognize and demodulate the pilot signals Lk carrier, transmitted to the coverage area of ​​the post-processing.

[0088] 通过上述过程,载频信号可以在波长、光纤链路以及远端天线单元上动态搬移。 [0088] Through the above process, the carrier signal may be dynamically moved in wavelength, optical fiber links and remote antenna unit.

[0089] 下面以一路载频信号Sl为例,来说明一个具体的虚拟载频搬移过程。 [0089] In the following way carrier signal Sl example to illustrate a particular virtual carrier frequency during transfer operations.

[0090] 虚拟载频搬移之前,无线载频信号Sl通过路径Linel传输到ID号为Rl的远端天线单元。 [0090] The virtual carrier frequencies before moving, the radio frequency carrier signal Sl Linel path transmission to the ID number of the remote antenna units Rl. Sl由BBU单元发出,经过R)(C单元交换到副载波调制单元的&端口,&是副载波调制的移频频率,Sl经过的移频处理后,频率变成fsl,fsl是副载波调制单元的调制频率, fsl射频信号被调制到光载波X1上,X1复用到WDMl上经光纤链路Li,传送远端天线单元R1。远端天线单元Rl通过光电转换和带通滤波器下载A1上的载频信号Si,经过变频后, 发射到覆盖区域。 Sl unit issued by the BBU, via R) (C switching unit to the subcarrier modulation unit & port, a subcarrier modulation & shift frequencies after the frequency shift process through Sl, into FSL frequency, subcarrier modulation is FSL frequency modulation means, fsl RF signals modulated onto an optical carrier X1, X1 via the fiber link Li multiplexed on WDMl, transmitting remote antenna unit R1. Rl remote antenna units by photoelectric conversion and band-pass filters A1 downloads Si on the carrier frequency signal, after conversion, is transmitted to the coverage area.

[0091] 映射关系表T中Sl的传输路径Linel如下所示: [0091] The transfer path T, Sl mapping relationship table of Linel follows:

[0092] [0092]

Figure CN101340647BD00111

[0093] 载频信号序号与远端天线单元ID号之间具有映射关系,并且映射满足合法性要求,这就完成了载频信号的发射和接收。 [0093] Reference signals between the remote antenna units and the ID number of carrier frequencies having a mapped relationship, and mapping to meet the requirements of legitimacy, this completes the transmission and reception carrier signal.

[0094] 如果虚拟载频搬移后,Sl的传输路径改为Line2,映射关系表中的参数对应关系 [0094] If the virtual carrier frequency shift, the transmission path to Line2 Sl, mapping relationship table of corresponding relationship between the parameters

如下所示: As follows:

[0095] [0095]

Figure CN101340647BD00112

[0096] 无线载频信号Sl发送到远端天线单元Ri,映射关系满足合法性要求。 [0096] radio frequency carrier signal Sl is sent to the remote antenna unit Ri, the legitimacy of the mapping satisfies the requirements.

[0097] 载频信号Sl的搬移过程中,没有改变中心化基站的硬件配置,而是通过软件控制RXC、SCM和OXC实现了载频信号在不同波长和不同光纤链路上的迁移。 Moving the process [0097] The carrier frequency signal Sl, the center does not change the hardware configuration of the base station, but through software control RXC, SCM and OXC achieve migration carrier signal at different wavelengths and different fiber links.

Claims (12)

1. 一种基于中心化基站的无线接入系统,其特征在于,包括:中心化基站,用于将载频信号进行动态配置或者虚拟载频搬移,将所述载频信号调制和复用到光波上,并将光波长复用到光纤链路;远端天线单元,通过光纤链路和所述中心化基站相连接,用于提取调制到光波链路的所述载频信号,经由发射天线发射到所覆盖的区域;所述中心化基站包括:基带处理单元,用于将载频信号转变为中频或者射频信号,并发送;射频交叉连接单元,用于将所述中频或者射频信号路由到副载波调制单元;副载波调制单元,用于使所述中频或者射频信号的频率产生移频形成调制频率,并将所述调制频率复用到一路光波长上,调制过程受频移键控单元监控;光交叉连接单元,用于将光波长路由到波分复用单元;波分复用单元,用于完成光波长到所述光纤链路的复用 A wireless access system based on the center of the base station, wherein, comprising: a centralized base station, the carrier signal for dynamic configuration or move the virtual carrier frequency, the carrier frequency and modulation signals multiplexed the light, and the wavelength multiplexed optical fiber link; remote antenna units, connected by an optical fiber link and the center of the base station, for extracting said optical wave link to modulate a carrier frequency signal, via the transmission antenna transmitted to the area covered; the centralized base station comprising: a baseband processing unit, configured to change the carrier frequency to an intermediate frequency signal or radio frequency signal, and transmits; a radio frequency cross connects, for connecting the RF signal is routed to an intermediate or subcarrier modulation section; subcarrier modulation means for causing said intermediate frequency or radio frequency signals generated frequency shift modulation frequency is formed, and the modulation frequency multiplexed on one optical wavelength, frequency shift keying modulation process by means monitoring; optical cross-connect unit for optical wavelength routed to wavelength division multiplexing unit; wavelength division multiplexing unit is configured to complete the optical wavelength multiplexing optical fiber link 控制维护单元,用于系统的管理和维护,以及用于虚拟载频搬移时对各模块进行协同处理;频移键控单元,用于检测副载波调制单元调制的准确性。 Maintenance control means for the system management and maintenance, as well as for virtual coordinated processing module for each carrier frequency shift; accuracy of the frequency shift keying means for detecting the subcarrier modulation unit.
2.根据权利要求1所述的基于中心化基站的无线接入系统,其特征在于,所述光纤链路包括依次相连接的WDM环网、全光纤环形网、OADM光节点和光纤支路。 The wireless access system based on the center of the base station according to claim 1, wherein the WDM ring network comprising optical fiber link connected sequentially, all-fiber ring network, an OADM optical node and an optical fiber branch.
3.根据权利要求1所述的基于中心化基站的无线接入系统,其特征在于,所述的远端天线单元包括光纤链路接口单元、射频前端和天线系统;所述光纤链路接口单元用于将光纤链路上的光波下载到远端天线单元RAU,或者,将RAU接收到的上行电信号转变为光信号,发送到光纤链路中去;射频前端用于将下行的基带信号调制为射频信号,或者将上行的射频信号下变频为基带信号,所述天线系统用于将射频信号发送出去。 The wireless access system based on the center of the base station according to claim 1, wherein said remote antenna unit includes an optical fiber link interface unit, RF front end and antenna system; the optical fiber link interface unit optical waves on the optical fiber link for downloading to the remote antenna unit RAU, or the RAU received uplink electrical signal into an optical signal, transmitted to the optical fiber link; a radio frequency front end for the downlink baseband signal modulation is a radio frequency signal or the uplink radio frequency signal to baseband signals, said antenna system for the radio frequency signal transmitted.
4.根据权利要求1所述的基于中心化基站的无线接入系统,其特征在于,所述频移键控单元接收所述控制维护单元中所述副载波调制单元的频率调制信息;所述频移键控单元检测副载波调制单元调制后的载波频率信息,将其与所述控制维护单元中的副载波调制单元的调制信息对比,两者一致说明副载波调制单元SCM调制正确,反之,说明SCM调制后的载波频率存在错误或误差。 The wireless access system based on the center of the base 1 as claimed in claim, wherein said frequency shift keying modulation unit receives the frequency control information in the maintenance unit of the subcarrier modulation unit; the FSK carrier frequency information detecting unit subcarrier modulation unit, the maintenance information with the contrast modulation control unit subcarrier modulation unit, consistent with both the subcarrier modulation section described SCM modulation correctly, otherwise, It indicates an error or an error of the carrier frequency modulated SCM.
5.根据权利要求1所述的基于中心化基站的无线接入系统,其特征在于,所述基带处理单元包含基带池,并与所述射频交叉连接单元动态连接。 The wireless access system based on the center of the base station according to claim 1, wherein said baseband processing unit comprises a base band, and is connected with the radio frequency unit dynamically cross-connected.
6.根据权利要求1所述的基于中心化基站的无线接入系统,其特征在于,所述副载波调制单元具有至少一个光波长输入端口和至少一个光波长输出端口;所述的射频交叉连接单元用于完成所述中频或射频信号的交叉连接,将载频信号路由到所述副载波调制单元的不同光波长输入端口上;所述的副载波调制单元用于将载频信号移频后调制和复用到一路光波长上,并通过不同的光波长输出端口发送。 The wireless access system based on the center of the base station, wherein said 1, the subcarrier modulation section having at least one optical wavelength of the at least one optical input port and output port as claimed in claim wavelength; the radio frequency cross-connection means for performing cross-connection to the intermediate frequency or radio frequency signals, the carrier signal is routed to the input port of the optical wavelength different subcarrier modulation unit; the subcarrier modulation means for frequency shifting the carrier frequency signal modulation and multiplexed onto one optical wavelength, and the output port via different transmission light wavelength.
7.根据权利要求1所述的基于中心化基站的无线接入系统,其特征在于,所述光交叉连接单元根据业务需要将不同的光波长路由到不同的波分复用单元,实现光波长的动态分配。 The wireless access system based on the center of the base, wherein according to claim 1, the optical cross-connect unit according to the service needs of different wavelengths are routed to different light wavelength division multiplexing unit for performing optical wavelength dynamic allocation.
8. 一种基于中心化基站的载频搬移方法,包括:(1)中心化基站将载频信号进行动态配置或者虚拟载频搬移,然后将移频后的载频信号调制和复用到光波上,并路由到不同的远端天线单元;(2)所述远端天线单元提取调制到光波上的所述载频信号,经由发射天线发射到所覆盖的区域;步骤(1)中,所述虚拟载频搬移的步骤包括:(11)对映射关系表进行初始化和更新;(12)改变载频信号与副载波移频频率的映射关系,使所述载频信号产生移频形成调制频率,并将所述调制频率调制并复用到一路光波长上;在移频、调制和复用过程中遵守所述映射关系表;(13)将所述光波长复用到光纤链路,在复用过程中,遵守所述映射关系表。 A method of moving the center frequency based on the carrier of a base station, comprising: (1) the center of the base station carrier signal for dynamic configuration or move the virtual carrier frequency, carrier frequency signal and then shifting the frequency modulated and multiplexed lightwave on, and routed to different remote antenna units; (2) the remote antenna unit extracts the modulated carrier signal to the light, emitted to the area covered by the transmitting antenna; step (1), the said step of moving the virtual carrier frequencies comprises: (11) to initialize the mapping table and updated; (12) changes the carrier frequency signal and a subcarrier mapping relationship between frequencies of the shift, the frequency shift of the carrier frequency signal generating modulation frequency is formed and the modulation frequency and wavelength multiplexed light on the way; in the frequency shift, modulation and multiplexing process in compliance with the mapping table; (13) the wavelength multiplexed optical fiber link, in multiplexing process, comply with the mapping table.
9.根据权利要求8所述的基于中心化基站的载频搬移方法,其特征在于,步骤⑴中, 在虚拟载频搬移时采用临近原则,在所述临近原则中优先考虑搬移副载波调制后频率相近的载频信号,然后考虑搬移临近光波长上的载频信号,最后考虑搬移临近光纤链路上的载频信号。 9. The method of moving the carrier frequency, wherein the step ⑴, the principles employed when the virtual adjacent carrier frequency shift, move priority in the adjacent subcarrier modulation according to principles based on the center of the base 8 requirements similar frequency carrier signal, and then move near the carrier frequency signal considering the wavelength of light, and finally considering moving carrier signal on adjacent fiber optic links.
10.根据权利要求8所述的基于中心化基站的载频搬移方法,其特征在于,步骤(11) 中,所述映射关系表包括载频信号列表、移频频率列表、调制频率列表、光波长列表、交叉连接光波长列表、波分复用列表以及光纤链路列表。 10. The method of moving the carrier based on the center of the base according to claim 8, wherein the step (11), said mapping table comprising a list of the optical carrier signal, frequency shifting rate list, the list of the modulation frequency, wavelengths list, a list of optical wavelength cross-connector, and an optical fiber WDM link list listing.
11.根据权利要求8所述的基于中心化基站的载频搬移方法,其特征在于,步骤(11) 中,配置所述映射关系表时,避免一个光波长上承载两个或两个以上的同频无线载波信号, 或者避免在一条光纤上承载两条或两条以上相同的光波长。 11. The method of moving the center of the carrier frequency based on a base station, characterized in that said according to claim 8, the step (11), arranged said mapping relationship table, an optical carrier wavelength to avoid two or more with the radio frequency carrier signal, or to avoid carry the same two or more than two wavelengths of light in an optical fiber.
12.根据权利要求10所述的基于中心化基站的载频搬移方法,其特征在于,步骤(12) 中,射频交叉连接单元通过调用所述载频信号列表,将所述载频信号路由到副载波调制单元;副载波调制单元调用所述移频频率列表、调制频率列表和光波长列表,将所述载频信号与副载波调制单元中的移频频率作用,产生调制频率,然后将该调制频率调制并复用到光波长上;步骤(1¾中,光交叉连接单元调用交叉连接光波长列表,将承载着载频信号的光波长进行光波长的交叉连接,并发送;波分复用单元调用波分复用列表,将所述光波长复用到光纤链路上。 12. Based on the center of the carrier frequency of the base station 10 moving method according to claim, wherein the step (12), the RF carrier frequency of the cross-connect unit list by calling signal, the carrier signal is routed to subcarrier modulation section; subcarrier modulation section shift frequencies of the call list, the list of the modulation frequency and wavelength of light list, the effect of frequency shift of the carrier frequency signal and subcarrier modulation unit, the modulation frequency is generated, then the modulation and frequency modulation on the multiplexed optical wavelength; step (1¾, the optical cross-connect unit connected call list cross optical wavelength, the optical wavelength carrying the carrier signal is optical wavelength cross-connect and transmission; wavelength division multiplexing unit call list WDM, the optical wavelength multiplexed onto the fiber link.
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