WO2016155412A1 - 一种降低干扰的方法和设备 - Google Patents

一种降低干扰的方法和设备 Download PDF

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Publication number
WO2016155412A1
WO2016155412A1 PCT/CN2016/072833 CN2016072833W WO2016155412A1 WO 2016155412 A1 WO2016155412 A1 WO 2016155412A1 CN 2016072833 W CN2016072833 W CN 2016072833W WO 2016155412 A1 WO2016155412 A1 WO 2016155412A1
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Prior art keywords
modulated signal
transmitting
time slot
signal
spectrum
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PCT/CN2016/072833
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English (en)
French (fr)
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戴刚
李周琦
郇海滨
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华为技术有限公司
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Priority to EP16771167.0A priority Critical patent/EP3258720A1/en
Priority to BR112017019597A priority patent/BR112017019597A2/pt
Publication of WO2016155412A1 publication Critical patent/WO2016155412A1/zh
Priority to US15/715,531 priority patent/US20180019833A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2003—Modulator circuits; Transmitter circuits for continuous phase modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference

Definitions

  • Embodiments of the present invention relate to the field of communications, and, more particularly, to a method and apparatus for reducing interference of co-frequency cells in a communication system to improve downlink performance.
  • GSM global system for mobile communications
  • the present invention provides a method and apparatus for reducing interference, using a specific time slot
  • the method of transmitting the modulated signal is to reduce the influence of interference when the network is compactly multiplexed, and improve the downlink receiving performance.
  • an apparatus for transmitting a modulated signal on a BCCH frequency carrier to reduce interference comprising:
  • a determining unit configured to determine a time slot for transmitting the modulated signal
  • a sending unit configured to send the modulation signal in the determined time slot
  • the autocorrelation metric of the modulated signal is greater than a first threshold.
  • the modulated signal is equal to an average energy of the GMSK modulated signal.
  • the spectrum processing unit is configured to perform spectrum shifting on the modulated signal such that the modulated signal is away from a channel center frequency point.
  • the determining unit is further configured to determine whether to send the modulated signal according to the sent content before determining the time slot for transmitting the modulated signal.
  • a second aspect provides a method for transmitting an optimized modulated signal on a Dummy time slot of a BCCH frequency carrier to reduce interference, the method being used in a primary BCCH multiplexing scenario, the method comprising:
  • the autocorrelation metric of the modulated signal is greater than a first threshold.
  • the modulated signal is equal to an average energy of the GMSK modulated signal.
  • the modulating signal is spectrally shifted, so that the modulating signal is away from the channel center frequency point.
  • the method before the determining the time slot for transmitting the modulated signal, the method further includes:
  • Whether or not to transmit a modulated signal is determined based on the content of the transmission.
  • a base station comprising the first aspect or any one of the first possible implementations of the first aspect.
  • the method for transmitting a modulated signal in the BCCH and the network side device provided by the embodiment of the present invention can reduce the interference of the same frequency cell and improve the downlink receiving performance by using the correlation of the modulated signal, thereby improving the communication system. performance.
  • FIG. 1(a) and 1(b) are schematic diagrams showing an application scenario of an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of a method of transmitting a modulated signal according to an embodiment of the present invention
  • FIG. 3 is another schematic diagram of a method of transmitting a modulated signal according to an embodiment of the present invention.
  • FIG. 4 is another schematic diagram of a method of transmitting a modulated signal according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of transmitting a modulated signal in a misaligned time slot according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of transmitting a modulated signal according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of transmitting a modulated signal according to an embodiment of the present invention.
  • GSM Global System of Mobile Communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • UMTS Universal Mobile Telecommunication System
  • WiMAX Worldwide Interoperability for Microwave Access
  • the network side device may be a base station, or may be another device having the function of a base station, where the base station may be a base station (Base Transceiver Station, abbreviated as "BTS”) in GSM or CDMA. It may be a base station (NodeB, abbreviated as "NB”) in WCDMA, or an evolved base station (Evolutional Node B, referred to as "ENB or e-NodeB”) in LTE, which is not limited by the present invention.
  • BTS Base Transceiver Station
  • NB base station
  • Evolutional Node B referred to as "ENB or e-NodeB”
  • the user equipment may also be referred to as a terminal equipment (Terminal Equipment), a mobile station (Mobile Station, referred to as "MS”), a mobile terminal (Mobile Terminal), etc., and the user equipment may be Communicating with one or more core networks via a Radio Access Network (“RAN”), for example, the user equipment may be a mobile phone (or "cellular" phone), a computer with a mobile terminal, etc. For example, it may be a portable, pocket, handheld, computer built-in or in-vehicle mobile device that exchanges language and/or data with a wireless access network.
  • RAN Radio Access Network
  • FIG. 1(a) and 1(b) are diagrams showing an example of a scenario in which an embodiment of the present invention is applicable. It should be noted that the examples of FIG. 1(a) and FIG. 1(b) are intended to assist those skilled in the art to better understand the embodiments of the present invention and not to limit the scope of the embodiments of the present invention.
  • the base station is composed of a plurality of sectors (3 sectors in the figure), and a plurality of base stations adopt a frequency multiplexing mode of 4*3.
  • the GSM basic carrier frequency is the primary broadcast control channel (BCCH) carrier frequency, the BCCH frequency coverage and signal quality determine the network service range and performance.
  • BCCH primary broadcast control channel
  • the C/I of the primary BCCH is required to reach 12 dB or more, and adjacent fans.
  • the area is not adjacent to the frequency.
  • the downlink carrier-to-interference ratio drops sharply. According to statistical analysis, when the 3*3 multiplexing mode is adopted, the downlink carrier-to-interference ratio is worse than 4*3 multiplexing. 4.5dB; and when 2*3 multiplexing is used, the downlink carrier-to-interference ratio is 7dB worse than 3*3 multiplexing.
  • the downlink carrier-to-interference ratio is reduced, and the interference between the same-frequency cells is increased, which may deteriorate the reception performance of the terminal.
  • the embodiment of the invention provides a method for transmitting an optimized modulation signal to reduce interference when a compact frequency multiplexing mode is adopted, and a schematic diagram of the method is shown in FIG. 2 .
  • the 3*3 multiplexing networking shown in FIG. 1(b) is taken as an example for description.
  • the BCCH carrier frequency needs to be used for downlink measurement, but the carrier does not allocate services from time to time, that is, it is sometimes unnecessary on the BCCH.
  • the service signal is transmitted, but the terminal needs to measure the neighboring area, so it is always necessary to maintain the transmission power on the primary BCCH. For this reason, when there is no service signal, it is necessary to transmit a modulation signal, which may not contain specific information, and is only used for the neighboring area measurement on the terminal side.
  • the autocorrelation metric of the modulated signal is greater than a first threshold.
  • the embodiment is described by taking a modulation signal as an example.
  • the modulated signal satisfies the following conditions:
  • the autocorrelation metric of the modulated signal is greater than a threshold.
  • the autocorrelation metric Corr min of the illustrated modulated signal can be calculated by the following function:
  • the autocorrelation metric Corr min of the modulation signal is greater than a certain threshold, and the threshold may be set according to an application requirement, for example, may be set to 45.
  • the modulated signal is only an example, and signals that satisfy the strong correlation in the time domain can be used as a modulated signal, such as a narrowband periodic signal or even a narrowband signal such as a single tone signal.
  • the modulated signal is equivalent to the average energy of the GMSK modulated signal.
  • the existing modulated signal is a GMSK modulated signal.
  • the average energy of the modulated signal can be made equal to the average energy of the existing GMSK modulated signal, that is, satisfy:
  • the energy of the modulated signal exemplified in the embodiment of the present invention is substantially equivalent to the energy of the existing GMSK modulated signal, and can be considered equivalent within a certain range.
  • the modulated signal can also be spectrally shifted.
  • This embodiment provides an example shifting formula for spectrum shifting:
  • FIG. 3 is a schematic diagram of a simulated spectrum of the modulated signal according to the embodiment.
  • the spectrum of the modulated signal can be seen from the figure.
  • the frequency band of the modulated signal after the spectrum shift is narrower, and the interference to the same frequency is smaller.
  • the main BCCH time slots collide with each other, which will form strong co-channel interference and affect network access and coverage.
  • the time slot may be misaligned.
  • the 0 slot of the primary BCCH of the cell 2 corresponds to the non-zero time slot of the cell 1.
  • the 0 time slot of the primary BCCH of the cell 2 corresponds to the other time slots of the cell 1, and the corresponding time slot may be fixedly configured as the TCH time slot.
  • the modulation signal used in the first embodiment is transmitted, so that the downlink main BCCH demodulation performance is improved, and the influence of the collision between the same frequencies is mitigated, by dislocating the time slot.
  • the application mode can improve the downlink demodulation performance under the condition that the system capacity is not damaged.
  • the probability of a complete collision of the primary BCCH slots of two co-frequency cells is small.
  • the above mentioned The modulated signal can also improve the downlink demodulation performance and reduce the impact of the same frequency collision in the asynchronous network scenario.
  • Embodiment 3 provides an apparatus 600 for transmitting a modulated signal in a BCCH to reduce interference.
  • the device 600 can be a base station or other functional entity.
  • the device includes a determining unit 601 and a transmitting unit 602.
  • the determining unit 601 is configured to determine a time slot for transmitting the modulated signal.
  • the 3*3 multiplexing networking shown in FIG. 1(b) is taken as an example for description.
  • the BCCH carrier frequency needs to be used for downlink measurement, but the carrier does not allocate services from time to time, that is, it is sometimes unnecessary on the BCCH.
  • the service signal is transmitted, but the terminal needs to measure the neighboring area, so it is always necessary to maintain the transmission power on the primary BCCH. For this reason, when there is no traffic signal, it is necessary to transmit a modulated signal, which may not contain specific information.
  • a modulated signal needs to be transmitted. Specifically, whether the modulation signal needs to be sent may be determined according to the currently transmitted content. When there is no service signal currently required to be transmitted, it is confirmed to transmit the modulated signal.
  • the sending unit 602 is configured to send the modulation signal in the determined time slot.
  • the autocorrelation metric of the modulated signal is greater than a first threshold.
  • the embodiment is described by taking a modulation signal as an example.
  • the modulated signal satisfies the following conditions:
  • the autocorrelation metric of the modulated signal is greater than a threshold.
  • the autocorrelation metric Corr min of the illustrated modulated signal can be calculated by the following function:
  • the autocorrelation metric Corr min of the modulation signal is greater than a certain threshold, and the threshold may be set according to an application requirement, for example, may be set to 45.
  • the modulated signal is only an example, and signals that satisfy the strong correlation in the time domain can be used as a modulated signal, such as a narrowband periodic signal or even a narrowband signal such as a single tone signal.
  • the modulated signal is equivalent to the average energy of the GMSK modulated signal.
  • the existing modulated signal is a GMSK modulated signal.
  • the average energy of the modulated signal can be made equal to the average energy of the existing GMSK modulated signal, that is, satisfy:
  • the energy of the modulated signal exemplified in the embodiment of the present invention is substantially equivalent to the energy of the existing GMSK modulated signal, and can be considered equivalent within a certain range.
  • the embodiment further includes a spectrum processing unit 603, which can perform spectrum shifting on the modulated signal.
  • a spectrum processing unit 603 which can perform spectrum shifting on the modulated signal.
  • This embodiment provides an example shifting formula for spectrum shifting:
  • Embodiment 4 provides an apparatus 700 for transmitting a modulated signal in a BCCH to reduce interference.
  • the device 700 can be a base station or other functional entity.
  • the device includes a processor 701, a transmitter 702.
  • the processor 701 is configured to determine a time slot for transmitting the modulated signal.
  • the processor 701 first determines whether a modulated signal needs to be transmitted. Specifically, whether the modulation signal needs to be sent may be determined according to the currently transmitted content. When there is no service signal currently required to be transmitted, it is confirmed to transmit the modulated signal.
  • the transmitter 702 is configured to send the modulation signal in the determined time slot.
  • the autocorrelation metric of the modulated signal is greater than a first threshold.
  • the embodiment is described by taking a modulation signal as an example.
  • the modulated signal satisfies the following conditions:
  • the autocorrelation metric of the modulated signal is greater than a threshold.
  • the modulated signal is equivalent to the average energy of the GMSK modulated signal.
  • the processor 701 may further perform spectrum shifting on the modulated signal.
  • This embodiment provides an example shifting formula for spectrum shifting:
  • devices 600, 700 in accordance with embodiments of the present invention may correspond to performing the methods of the embodiments of the present invention.
  • system and “network” are used interchangeably herein. It should be understood that the term “and/or” herein is merely an association describing the associated object. It is indicated that there may be three kinds of relationships, for example, A and/or B, which may indicate that there are three cases where A exists separately, A and B exist at the same time, and B exists separately. In addition, the character “/" in this article generally indicates that the contextual object is an "or" relationship.
  • B corresponding to A means that B is associated with A, and B can be determined from A.
  • determining B from A does not mean that B is only determined based on A, and that B can also be determined based on A and/or other information.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solution of the embodiment. of.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • An integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, can be stored in a computer readable storage medium.
  • the technical solution of the present invention which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a USB flash drive, a mobile hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a disk or a CD.
  • ROM Read-Only Memory
  • RAM Random Access Memory

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Abstract

本发明提供了一种降低干扰的方法和设备，通过利用调制信号的相关性，能够降低同频小区的干扰，提升下行接收性能，从而提高通信系统的性能。

Description

一种降低干扰的方法和设备
本申请要求于2015年03月27日提交中国专利局、申请号为201510142520.0、发明名称为“一种降低干扰的方法和设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明实施例涉及通信领域，并且更具体地，涉及降低通信系统中的同频小区的干扰以提升下行性能的方法和设备。
背景技术
随着现代通信的发展，第三代(3rd generation,3G)和第四代(4th generation,4G)网络在全球的大规模建设，原有的全球移动通信(global system for mobile communications,GSM)系统用户规模在不断缩小。由于频谱资源有限，因此将GSM所占用的频谱资源重整(refarming)给通用移动通信系统(universal mobile telecommunications system,UMTS)或长期演进(long term evolution,LTE)是全球网络发展的普遍趋势。但是由于GSM设备成本及网络覆盖优势，GSM网络预计还会存在很长一段时间，在未来物联网的(machine-to-machine,M2M)时代，很多低速小包传感器数据可能会广泛采用低成本的GSM模块。因此，尽管GSM用户数在不断缩小，但是运营商还是希望GSM作为基础网络长期存在。
统计发现全球有一半以上GSM网络带宽小于7.4M，如果再从GSM网络Refarming出部分带宽资源给3G/4G，那么GSM频谱资源会更少。如何采用剩余的带宽频谱进行GSM组网，是很多运营商需要面对的问题。一种方式是通过更紧密的复用方式组网方式，例如采用3*3，甚至2*3，1*3。但采用更紧密的复用方式组网会使得下行载干比急剧下降，从而会使得终端接收性能恶化。
发明内容
本发明提供了一种降低干扰的方法和设备，利用在特定时隙发 送调制信号的方式，以达到在采用紧密的复用方式组网时降低干扰的影响，提升下行接收性能。
第一方面，提供一种在BCCH频载上发送调制信号以降低干扰的设备，所述设备包括：
确定单元，用于确定发送调制信号的时隙；
发送单元，用于在确定的所述时隙发送所述调制信号；
其中，所述调制信号的自相关度量值大于第一阈值。
结合第一方面，在第一方面的第一种可能的实现方式中，所述调制信号与GMSK调制信号的平均能量等同。
结合第一方面或第一方面的第一种可能的实现方式，在第一方面的第二种可能的实现方式中，还包括频谱处理单元；
所述频谱处理单元，用于对所述调制信号进行频谱搬移，以使得所述调制信号远离信道中心频点。
结合第一方面，在第一方面的第三种可能的实现方式中，所述确定单元，还用于在确定发送调制信号的时隙之前，根据发送内容判断是否发送调制信号。
第二方面，提供一种在BCCH频载的Dummy时隙上发送优化调制信号以降低干扰的方法，该方法用于主BCCH复用场景，所述方法包括：
确定发送调制信号的时隙；
在确定的所述时隙发送所述调制信号；
其中，所述调制信号的自相关度量值大于第一阈值。
结合第二方面，在第二方面的第一种可能的实现方式中，所述调制信号与GMSK调制信号的平均能量等同。
结合第二方面或第二方面的第一种可能的实现方式，在第二方面的第二种可能的实现方式中，对所述调制信号进行频谱搬移，以使得所述调制信号远离信道中心频点。
结合第二方面，在第二方面的第三种可能的实现方式中，在所述确定发送调制信号的时隙之前，还包括：
根据发送内容判断是否发送调制信号。
第三方面，提供一种基站，其特征在于，包括第一方面或第一方面的第一至第三任一种可能的实现方式。
基于上述技术方案，本发明实施例提供的在BCCH中传送调制信号的方法和网络侧设备，通过利用调制信号的相关性，能够降低同频小区的干扰，提高下行接收性能，从而提高通信系统的性能。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1(a)和图1(b)是本发明实施例的应用场景的示意图；
图2是根据本发明实施例的发送调制信号的方法的示意性流程图；
图3是根据本发明实施例的发送调制信号的方法的另一示意图；
图4是根据本发明实施例的发送调制信号的方法的另一示意图；
图5是根据本发明实施例的在错位时隙发送调制信号的示意图；
图6是根据本发明实施例的发送调制信号的结构示意图；
图7是根据本发明实施例的发送调制信号的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有付出创造性劳动的前提下所获得的所有其他实施例，都属于本发明保护的范围。
应理解，本发明实施例的技术方案可以应用于各种通信系统，例如：全球移动通讯(Global System of Mobile Communication，简称为“GSM”)系统、码分多址(Code Division Multiple Access，简称为“CDMA”)系统、宽带码分多址(Wideband Code Division Multiple Access，简称为“WCDMA”)系统、通用分组无线业务(General Packet Radio Service，简称为“GPRS”)、长期演进(Long Term Evolution，简称为“LTE”)系统、LTE频分双工(Frequency Division Duplex，简称为“FDD”)系统、LTE时分双工(Time Division Duplex，简称为“TDD”)、通用移动通信系统(Universal Mobile Telecommunication System，简称为“UMTS”)或全球互联微波接入(Worldwide Interoperability for Microwave Access，简称为“WiMAX”)通信系统等。
应理解，在本发明实施例中，网络侧设备可以是基站，也可以是具有基站的功能的其他设备，其中基站可以是GSM或CDMA中的基站(Base Transceiver Station，简称为“BTS”)，也可以是WCDMA中的基站(NodeB，简称为“NB”)，还可以是LTE中的演进型基站(Evolutional Node B，简称为“ENB或e-NodeB”)，本发明并不限定。
还应理解，在本发明实施例中，用户设备也可称之为终端设备(Terminal Equipment)、移动台(Mobile Station，简称为“MS”)、移动终端(Mobile Terminal)等，该用户设备可以经无线接入网(Radio Access Network，简称为“RAN”)与一个或多个核心网进行通信，例如，用户设备可以是移动电话(或称为“蜂窝”电话)、具有移动终端的计算机等，例如，可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置，它们与无线接入网交换语言和/或数据。
图1(a)和图1(b)示出了可应用本发明实施例的场景的例子的示意图。应注意，图1(a)和图1(b)的例子是为了帮助本领域技术人员更好地理解本发明实施例，而非限制本发明实施例的范围。
如图1(a)所示，基站由多个扇区(图中为3扇区)组成，多个基站采用4*3的频率复用模式。GSM基本载频是主广播控制信道(broadcast control channel,BCCH)载频，BCCH频点覆盖范围和信号质量决定网络服务范围和性能，一般要求主BCCH的C/I达到12dB以上，且相邻扇区不邻频。GSM每个载频所占用带宽为200kHz，则所需带宽为3*4*0.2＝2.4(MHz)。
由于全球有一半以上GSM网络带宽小于7.4M，以此来计算，如果将GSM的频谱资源Refarming出5M带宽给3G/4G，那么GSM剩余的频谱不足2.4M。要利用GSM剩余的频谱资源进行复用组网，就只能采用紧密的复用方式，例如采用3*3，如图1(b)所示，甚至2*3，1*3等更紧密的复用方式进行组网。
由于采用了更紧密的复用方式组网，使得下行载干比急剧下降，据统计分析，当采用3*3的复用方式组网时，相比4*3复用，下行载干比恶化4.5dB；而当采用2*3复用，相比3*3复用，下行载干比恶化7dB。
下行载干比的降低，同频小区间的干扰加大，会使得终端接收性能恶化。
实施例一
本发明实施例提供一种方法，用于在采用紧密的频率复用方式时，发送优化调制信号以降低干扰，方法示意图如图2所示。
S201，确定发送调制信号的时隙。
本实施例以图1(b)所示的3*3复用组网为例来进行说明，BCCH载频需要用作下行测量，但载波上并非时时会分配业务，即在BCCH上有时不需要传送业务信号，但终端需要对邻区进行测量，因此在主BCCH上始终需要保持有发送功率。为此，在没有业务信号时，需要发送调制信号，该调制信号可以不含有具体信息，只用于终端侧进行邻区测量。
为此，先判断是否需要发送调制信号。具体的，可以根据当前 发送的内容来判断是否需要发送调制信号。当前无业务信号需要发送时，确认发送该调制信号。
S202，在确定的所述时隙发送所述调制信号。
当确定需要没有业务信号发送时，在确定的时隙发送该调制信号，
其中，所述调制信号的自相关度量值大于第一阈值。
具体的，本实施例以如下调制信号为例来说明，
Figure PCTCN2016072833-appb-000001
该调制信号满足以下条件：
该调制信号的自相关度量值大于阈值。
该所示调制信号的自相关度量值Corrmin可以通过如下函数计算所得：
Figure PCTCN2016072833-appb-000002
Figure PCTCN2016072833-appb-000003
因此，为了保证一定的性能效果，调制信号的自相关度量值Corrmin要大于一定阈值，该阈值可以根据应用需要来设定，例如可以设置为45。
应理解，调制信号的自相关度量值Corrmin越大，信号的时域相关性越强。该调制信号只是一种示例，满足时域强相关的信号都可以作为调制信号，例如窄带周期信号，甚至单音信号等窄带信号都可以。
优选的，所述调制信号与GMSK调制信号的平均能量等同。假设现有的调制信号为GMSK调制信号，用
r(n),n＝1，2,3...,nBurstLen来表示，
本实施例使用的调制信号为：
x(n),n＝1,2,3...,nBurstLen，
那么，为了不对终端侧的邻区测量造成影响，可以使得调制信号平均能量和现有的GMSK调制信号的平均能量等同，即满足：
Figure PCTCN2016072833-appb-000004
应理解，本发明实施例所示例的调制信号的能量和现有的GMSK调制信号的能量大致相当即可，在一定范围内都可以认为等同。
优选的，还可以对所述调制信号进行频谱搬移，本实施例给出一个频谱搬移的示例搬移公式：
y(n)＝x(n)*exp(j*2*pi*Δf/FST/Fs)
由于变化后的信号频谱较窄，为了最大化下行解调性能收益，可以在GMSK的信道200K带宽内对信号x(n)进行一定的频谱搬移，离信道中心频点越远，对其同频的载波的干扰就越小，下行终端侧的性能收益就越大。应理解，如频谱搬移过大，则会影响到下行终端侧电平测量的准确行，因此频谱搬移量Δf一般需要控制在合适的范围内。本实施例给出了一个示例范围，但不限定为该范围，-60KHz≤Δf≤60KHz。
图3所示为采用本实施例的调制信号仿真频谱图，通过上述所示的频谱搬移，本实施例以Δf＝-30KHz为例，经过仿真，得到如图4所示的经过频谱搬移后的调制信号的频谱图，由图中可以看出，经过频谱搬移后的调制信号频带更窄，对同频的干扰更小。
实施例二
对于两个主BCCH同频小区，相互间会形成同频干扰，基于同步网络，如果直接应用，主BCCH时隙相互碰撞，会形成较强的同频干扰，对网络接入及覆盖等造成影响，可以通过时隙错位，如图5所示，小区2的主BCCH的0时隙与小区1的非0其它时隙对应， 使用实施例一中的调制信号，可以使得下行主BCCH的0时隙解调性能的提升，减小相对同频间碰撞的影响，固定配置空闲时隙可以最大化的提升下行终端侧的性能。
对于同步网络，当采用如上方式将时隙错位后，例如小区2的主BCCH的0时隙与小区1的其它时隙对应，也可以将与之对应的时隙固定配置为TCH时隙，当无有用信息发送(DTX段或者信道无占用时)，发送实施例一中所采用的调制信号，使得下行主BCCH解调性能的提升，缓解同频间相互碰撞的影响，通过将时隙错位这种应用方式在系统容量无损的条件下，可以实现下行解调性能的改善。
对于异步网络，两个同频小区的主BCCH时隙完全碰撞的概率很小，当与TCH时隙碰撞时，在无有用信息发送(DTX段或者信道无占用时)，也可以发送上述提到的调制信号，在异步网络场景下同样可以带来下行解调性能的提升，减小同频碰撞的影响。
实施例三
实施例三提供一种在BCCH中传送调制信号以降低干扰的设备600。该设备600可以为基站或其他功能实体。该设备包括确定单元601，发送单元602。
确定单元601，用于确定发送调制信号的时隙。
本实施例以图1(b)所示的3*3复用组网为例来进行说明，BCCH载频需要用作下行测量，但载波上并非时时会分配业务，即在BCCH上有时不需要传送业务信号，但终端需要对邻区进行测量，因此在主BCCH上始终需要保持有发送功率。为此，在没有业务信号时，需要发送调制信号，该调制信号可以不含有具体信息。
为此，先判断是否需要发送调制信号。具体的，可以根据当前发送的内容来判断是否需要发送调制信号。当前无业务信号需要发送时，确认发送该调制信号。
发送单元602，用于在确定的所述时隙发送所述调制信号。
当确定需要没有业务信号发送时，在确定的时隙发送该调制信号，
其中，所述调制信号的自相关度量值大于第一阈值。
具体的，本实施例以如下调制信号为例来说明，
Figure PCTCN2016072833-appb-000005
该调制信号满足以下条件：
该调制信号的自相关度量值大于阈值。
该所示调制信号的自相关度量值Corrmin可以通过如下函数计算所得：
Figure PCTCN2016072833-appb-000006
Figure PCTCN2016072833-appb-000007
因此，为了保证一定的性能效果，调制信号的自相关度量值Corrmin要大于一定阈值，该阈值可以根据应用需要来设定，例如可以设置为45。
应理解，调制信号的自相关度量值Corrmin越大，信号的时域相关性越强。该调制信号只是一种示例，满足时域强相关的信号都可以作为调制信号，例如窄带周期信号，甚至单音信号等窄带信号都可以。
优选的，所述调制信号与GMSK调制信号的平均能量等同。假设现有的调制信号为GMSK调制信号，用
r(n),n＝1,2,3...,nBurstLen来表示，
本实施例使用的调制信号为：
x(n),n＝1,2,3...,nBurstLen，
那么，为了不对终端侧的邻区测量造成影响，可以使得调制信号平均能量和现有的GMSK调制信号的平均能量等同，即满足：
Figure PCTCN2016072833-appb-000008
应理解，本发明实施例所示例的调制信号的能量和现有的GMSK调制信号的能量大致相当即可，在一定范围内都可以认为等同。
可选的，该实施例还包括频谱处理单元603，可以对所述调制信号进行频谱搬移，本实施例给出一个频谱搬移的示例搬移公式：
y(n)＝x(n)*exp(j*2*pi*Δf/FST/Fs)
由于变化后的信号频谱较窄，为了最大化下行解调性能收益，可以在GMSK的信道200K带宽内对信号x(n)进行一定的频谱搬移，离信道中心频点越远，对其同频的载波的干扰就越小，下行终端侧的性能收益就越大。应理解，如频谱搬移过大，则会影响到下行终端侧电平测量的准确行，因此频谱搬移量Δf一般需要控制在合适的范围内。本实施例给出了一个示例范围，但不限定为该范围，-60KHz≤Δf≤60KHz。
实施例四
实施例四提供一种在BCCH中传送调制信号以降低干扰的设备700。该设备700可以为基站或其他功能实体。该设备包括处理器701，发送器702。
处理器701，用于确定发送调制信号的时隙。
处理器701先判断是否需要发送调制信号。具体的，可以根据当前发送的内容来判断是否需要发送调制信号。当前无业务信号需要发送时，确认发送该调制信号。
发送器702，用于在确定的所述时隙发送所述调制信号。
当确定需要没有业务信号发送时，在确定的时隙发送该调制信号，
其中，所述调制信号的自相关度量值大于第一阈值。
具体的，本实施例以如下调制信号为例来说明，
Figure PCTCN2016072833-appb-000009
该调制信号满足以下条件：
该调制信号的自相关度量值大于阈值。
具体的确定方式在前述实施例中已有详细描述，此处不再赘述。
优选的，所述调制信号与GMSK调制信号的平均能量等同。
可选的，处理器701，还可以对所述调制信号进行频谱搬移，本实施例给出一个频谱搬移的示例搬移公式：
y(n)＝x(n)*exp(j*2*pi*Δf/FST/Fs)
由于变化后的信号频谱较窄，为了最大化下行解调性能收益，可以在GMSK的信道200K带宽内对信号x(n)进行一定的频谱搬移，离信道中心频点越远，对其同频的载波的干扰就越小，下行终端侧的性能收益就越大。应理解，如频谱搬移过大，则会影响到下行终端侧电平测量的准确行，因此频谱搬移量Δf一般需要控制在合适的范围内。本实施例给出了一个示例范围，但不限定为该范围，-60KHz≤Δf≤60KHz。
应理解，根据本发明实施例的设备600,700可对应于执行本发明实施例中的方法。
应理解，说明书通篇中提到的“一个实施例”或“一实施例”意味着与实施例有关的特定特征、结构或特性包括在本发明的至少一个实施例中。因此，在整个说明书各处出现的“在一个实施例中”或“在一实施例中”未必一定指相同的实施例。此外，这些特定的特征、结构或特性可以任意适合的方式结合在一个或多个实施例中。
在本发明的各种实施例中，应理解，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本发明实施例的实施过程构成任何限定。
另外，本文中术语“系统”和“网络”在本文中常可互换使用。应理解，本文中术语“和/或”，仅仅是一种描述关联对象的关联关系， 表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请所提供的实施例中，应理解，“与A相应的B”表示B与A相关联，根据A可以确定B。但还应理解，根据A确定B并不意味着仅仅根据A确定B，还可以根据A和/或其它信息确定B。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、计算机软件或者二者的结合来实现，为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目 的。
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，简称为“ROM”)、随机存取存储器(Random Access Memory，简称为“RAM”)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。

Claims (9)

  1. 一种在BCCH载频上发送调制信号以降低干扰的设备，所述设备包括：
    确定单元，用于确定发送调制信号的时隙；
    发送单元，用于在确定的所述时隙发送所述调制信号；
    其中，所述调制信号的自相关度量值大于第一阈值。
  2. 根据权利要求1所述的设备，其特征在于，所述调制信号与所述GMSK调制信号的平均能量等同。
  3. 根据权利要求1或2所述的设备，其特征在于，还包括频谱处理单元；
    所述频谱处理单元，用于对所述调制信号进行频谱搬移，以使得所述调制信号远离信道中心频点。
  4. 根据权利要求1所述的设备，其特征在于，所述确定单元，还用于在确定发送调制信号的时隙之前，根据发送内容判断是否发送调制信号。
  5. 一种在BCCH载频上发送调制信号以降低干扰的方法，该方法用于主BCCH复用场景，所述方法包括：
    确定发送调制信号的时隙；
    在确定的所述时隙发送所述调制信号；
    其中，所述调制信号的自相关度量值大于第一阈值。
  6. 根据权利要求5所述的方法，其特征在于，所述调制信号与所述GMSK调制信号的平均能量等同。
  7. 根据权利要求5或6所述的方法，其特征在于，对所述调制信号进行频谱搬移，以使得所述调制信号远离信道中心频点。
  8. 根据权利要求5所述的方法，其特征在于，在所述确定发送调制信号的时隙之前，还包括：
    根据发送内容判断是否发送调制信号。
  9. 一种基站，其特征在于，包括如权利要求1至4所述的设备。
PCT/CN2016/072833 2015-03-27 2016-01-29 一种降低干扰的方法和设备 WO2016155412A1 (zh)

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