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CN107333241A - The up transmitting terminal timing adjusting method of satellite mobile communication based on LTE systems - Google Patents

The up transmitting terminal timing adjusting method of satellite mobile communication based on LTE systems Download PDF

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CN107333241A
CN107333241A CN201710650857.1A CN201710650857A CN107333241A CN 107333241 A CN107333241 A CN 107333241A CN 201710650857 A CN201710650857 A CN 201710650857A CN 107333241 A CN107333241 A CN 107333241A
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satellite
ground terminal
distance
mrow
position information
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CN107333241B (en
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朱立东
刘坤
卓永宁
廖为城
秦思高
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University of Electronic Science and Technology of China
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18513—Transmission in a satellite or space-based system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/023—Services making use of location information using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18545—Arrangements for managing station mobility, i.e. for station registration or localisation
    • H04B7/18547—Arrangements for managing station mobility, i.e. for station registration or localisation for geolocalisation of a station
    • H04B7/1855—Arrangements for managing station mobility, i.e. for station registration or localisation for geolocalisation of a station using a telephonic control signal, e.g. propagation delay variation, Doppler frequency variation, power variation, beam identification
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18545—Arrangements for managing station mobility, i.e. for station registration or localisation
    • H04B7/18547—Arrangements for managing station mobility, i.e. for station registration or localisation for geolocalisation of a station
    • H04B7/18554—Arrangements for managing station mobility, i.e. for station registration or localisation for geolocalisation of a station using the position provided by an existing geolocalisation system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

本发明涉及宽带卫星通信导航领域，特别涉及一种基于LTE体制的卫星移动通信上行发射端定时调整方法。本发明是一种基于LTE体制的卫星移动通信上行发射端定时调整方法，解决了卫星LTE上行定时同步问题，省去了LTE中利用TA（定时提前量）进行接收端定时同步的过程，同时也解决了卫星波束内用户传输时延差大导致的前导序列设计与检测问题，提高了用户接入一次成功率，降低了多普勒频移对上行定时同步的影响，提高了信号传输效率。

The invention relates to the field of broadband satellite communication and navigation, in particular to a timing adjustment method for an uplink transmitter of satellite mobile communication based on the LTE system. The present invention is a method for adjusting the timing of the satellite mobile communication uplink transmitting end based on the LTE system, which solves the problem of satellite LTE uplink timing synchronization, and saves the process of using TA (timing advance) to synchronize the timing of the receiving end in LTE. It solves the problem of preamble design and detection caused by large user transmission delay difference in the satellite beam, improves the success rate of user access once, reduces the impact of Doppler frequency shift on uplink timing synchronization, and improves signal transmission efficiency.

Description

基于LTE体制的卫星移动通信上行发射端定时调整方法Timing Adjustment Method for Uplink Transmitter of Satellite Mobile Communication Based on LTE System

技术领域technical field

本发明涉及宽带卫星通信导航领域，特别涉及一种基于LTE体制的卫星移动通信上行发射端定时调整方法。The invention relates to the field of broadband satellite communication and navigation, in particular to a timing adjustment method for an uplink transmitter of satellite mobile communication based on the LTE system.

背景技术Background technique

卫星移动通信作为地面蜂窝系统的补充和扩展，具有覆盖面积大、通信距离远、通信容量大等一系优点，是实现全球网络无缝隙覆盖的不可缺少的通信方式。现有的卫星移动通信系统采用FDMA、TDMA或CDMA多址方式，主要支持文本、语音等较低速率的业务，难以适应视频、图像等多媒体信息的传输。将LTE技术应用于卫星移动通信，可以大大提高数据传输速率、频谱利用率以及小区容量。但是，LTE应用于卫星移动通信系统中仍存在较多的关键问题需要研究，例如峰均比控制、多普勒频移消除、用户随机接入等。As the supplement and extension of the terrestrial cellular system, satellite mobile communication has a series of advantages such as large coverage area, long communication distance, and large communication capacity. It is an indispensable communication method to achieve seamless global network coverage. Existing satellite mobile communication systems adopt FDMA, TDMA or CDMA multiple access methods, mainly supporting services at relatively low rates such as text and voice, and are difficult to adapt to the transmission of multimedia information such as video and images. Applying LTE technology to satellite mobile communications can greatly improve data transmission rate, spectrum utilization and cell capacity. However, there are still many key issues that need to be studied in the application of LTE to satellite mobile communication systems, such as peak-to-average ratio control, Doppler frequency shift cancellation, and user random access.

基于LTE体制的卫星移动通信中，同一波束内的用户上行定时同步是需要解决的重点问题之一。目前，地面LTE采用随机接入过程中的随机接入信号检测，获得用户到卫星的时延，并将此时延作为定时提前量反馈给用户，然后用户再进行定时调整，从而实现多用户的上行定时同步。但是，卫星移动通信的波束小区范围大于地面蜂窝小区，卫星一个波束内的用户之间传输时延差较大，因此需要对随机接入信号格式等进行重新设计，这种设计一般会增加通信系统资源消耗，容易受到多普勒频移影响，以及对用户接入一次成功率要求较高。In the satellite mobile communication based on the LTE system, the uplink timing synchronization of users in the same beam is one of the key issues to be solved. At present, terrestrial LTE uses random access signal detection in the random access process to obtain the delay from the user to the satellite, and feeds this delay back to the user as a timing advance, and then the user adjusts the timing to achieve multi-user communication. Uplink timing synchronization. However, the beam cell range of satellite mobile communication is larger than that of ground cells, and the transmission delay difference between users in a satellite beam is relatively large. Therefore, it is necessary to redesign the random access signal format, which generally increases the communication system. Resource consumption, easy to be affected by Doppler frequency shift, and high requirements on the success rate of user access once.

发明内容Contents of the invention

本发明的目的在于：为进一步简化基于LTE体制的卫星移动通信上行定时同步流程，提出了一种基于LTE体制的卫星移动通信上行发射端定时调整方法。The object of the present invention is: in order to further simplify the uplink timing synchronization process of the satellite mobile communication based on the LTE system, a method for adjusting the timing of the uplink transmitter of the satellite mobile communication based on the LTE system is proposed.

为实现上述目的，本发明提出了一种基于LTE体制的卫星移动通信上行发射端定时调整方法，其包括以下步骤，In order to achieve the above object, the present invention proposes a method for adjusting the timing of the satellite mobile communication uplink transmitter based on the LTE system, which includes the following steps,

一种基于LTE体制的卫星移动通信上行发射端定时调整方法，包括如下步骤：A method for adjusting the timing of an uplink transmitter in satellite mobile communication based on the LTE system, comprising the steps of:

(1)第一地面终端获取卫星投射到地面的至少一个波束，自波束中确定自身位置信息；(1) The first ground terminal obtains at least one beam projected by the satellite to the ground, and determines its own position information from the beam;

(2)接收卫星发射的导频信号，获取最新时刻的卫星星历数据，进而确定当前时刻的卫星位置信息和波束中心位置信息；(2) Receive the pilot signal transmitted by the satellite, obtain the latest satellite ephemeris data, and then determine the current satellite position information and beam center position information;

(3)根据自身位置信息与卫星位置信息、波束中心位置信息，计算第一地面终端与卫星的距离，以及，波束中心与卫星的距离，获取自身到卫星的信号传播所需第一时间与波束中心到卫星的信号传播所需第二时间的时延差；(3) Calculate the distance between the first ground terminal and the satellite, and the distance between the beam center and the satellite according to its own position information, satellite position information, and beam center position information, and obtain the first time and beam required for signal propagation from itself to the satellite The delay difference of the second time required for signal propagation from the center to the satellite;

(4)相对于位于波束中心位置处的第二地面终端，所述第一地面终端提前该时延差的时长发送上行信号；通过对地面终端发射上行信号进行定时调整，使得不同地面终端发射的信号同时到达卫星，实现卫星接收端定时同步。(4) Compared with the second ground terminal located at the center of the beam, the first ground terminal sends an uplink signal in advance of the time delay difference; by adjusting the timing of the uplink signal transmitted by the ground terminal, the signals transmitted by different ground terminals The signal arrives at the satellite at the same time, realizing the timing synchronization of the satellite receiver.

进一步的，所述卫星的通信体制为LTE。Further, the communication system of the satellite is LTE.

进一步的，所述步骤(3)中，第一地面终端或波束中心到卫星的距离计算公式为：Further, in the step (3), the formula for calculating the distance from the first ground terminal or beam center to the satellite is:

式中，d为所求距离；Re为地球的平均半径；r为卫星与地心之间的距离；θ为地球中心角，其计算公式为：In the formula, d is the distance to be sought; R e is the average radius of the earth; r is the distance between the satellite and the center of the earth; θ is the center angle of the earth, and its calculation formula is:

其中，和分别为地面点和卫星的经纬度；所述地面点为第一地面终端位置或波束中心位置。in, with are the ground point and the latitude and longitude of the satellite, respectively; the ground point is the first ground terminal position or beam center position.

进一步的，所述时延差计算公式为：Further, the formula for calculating the delay difference is:

式中，Δτ为所求的时延差；c为光的传播速度；d为第一地面终端到卫星的距离，dr为波束中心位置到卫星的距离。In the formula, Δτ is the time delay difference; c is the propagation speed of light; d is the distance from the first ground terminal to the satellite, and d r is the distance from the center of the beam to the satellite.

进一步的，所述位置信息包括经度、纬度和高度。Further, the location information includes longitude, latitude and altitude.

与现有技术相比，本发明的有益效果：本发明是一种基于LTE体制的卫星移动通信上行发射端定时调整方法，解决了卫星LTE上行定时同步问题，省去了LTE中利用TA(定时提前量)进行接收端定时同步的过程，同时也解决了卫星波束内用户传输时延差大导致的前导序列设计与检测问题，提高了用户接入一次成功率，降低了多普勒频移对上行定时同步的影响，提高了信号传输效率。Compared with the prior art, the beneficial effect of the present invention: the present invention is a kind of satellite mobile communication uplink transmitter timing adjustment method based on the LTE system, which solves the satellite LTE uplink timing synchronization problem, and saves the use of TA (timing advance) to carry out the timing synchronization process of the receiving end, and also solve the preamble sequence design and detection problems caused by the large transmission delay difference of users in the satellite beam, improve the success rate of user access once, and reduce the impact of Doppler frequency shift The impact of uplink timing synchronization improves signal transmission efficiency.

附图说明：Description of drawings:

图1是本发明方法的流程示意图；Fig. 1 is a schematic flow sheet of the inventive method;

图2是本发明方法的系统架构示意图；Fig. 2 is a schematic diagram of the system architecture of the method of the present invention;

具体实施方式detailed description

下面结合附图及具体实施例对本发明作进一步的详细描述。但不应将此理解为本发明上述主题的范围仅限于以下的实施例，凡基于本发明内容所实现的技术均属于本发明的范围。The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. However, it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

实施例1：如图1所示，本实施例提供一种多波束卫星LTE上行发射端定时调整方法，包括以下步骤，Embodiment 1: As shown in FIG. 1, this embodiment provides a method for adjusting the timing of a multi-beam satellite LTE uplink transmitting end, including the following steps,

S1：在卫星投射到地面的一个波束中，某个第一地面终端UE通过自身具有的卫星定位功能(如GPS、北斗、伽利略，本实施例以GPS为例)确定自身的位置信息，该位置信息包括但不限于经度、纬度和高度。具体地，所述地面终端是指在所述卫星覆盖波束范围内的用于与所述卫星进行通信的处理装置，所述若干地面终端以改进的LTE接入所述卫星，所述第一地面终端UE是指若干地面终端中的任意一个。S1: In a beam projected by a satellite to the ground, a certain first ground terminal UE determines its own position information through its own satellite positioning function (such as GPS, Beidou, Galileo, this embodiment uses GPS as an example). Information includes, but is not limited to, longitude, latitude, and altitude. Specifically, the ground terminal refers to a processing device for communicating with the satellite within the coverage beam range of the satellite, the several ground terminals access the satellite with improved LTE, and the first ground terminal A terminal UE refers to any one of several ground terminals.

S2：该第一地面终端UE通过接收卫星发射的导频信号，获取最新时刻的卫星星历等数据，进而确定当前时刻的卫星位置信息和波束中心位置信息，位置信息包括经度、纬度和高度；所述导频信号包括卫星星历信息、卫星波束星下点位置信息等，所述地面终端接收导频信号的目的是为了确认所述卫星和第一地面终端UE所在波束的波束中心位置信息。S2: The first ground terminal UE acquires data such as the latest satellite ephemeris by receiving the pilot signal transmitted by the satellite, and then determines the current satellite position information and beam center position information, and the position information includes longitude, latitude and altitude; The pilot signal includes satellite ephemeris information, satellite beam sub-satellite point position information, etc., and the purpose of receiving the pilot signal by the ground terminal is to confirm the beam center position information of the beam where the satellite and the first ground terminal UE are located.

S3：该第一地面终端UE根据已经获得的位置信息，分别计算该第一地面终端UE与卫星的距离，以及波束中心位置到卫星的距离，进而求得地面终端UE到卫星与波束中心到卫星的信号传播时延差；具体地，卫星到第一地面终端UE到卫星的距离，或者，波束中心到卫星的距离计算公式为：S3: The first ground terminal UE calculates the distance between the first ground terminal UE and the satellite and the distance from the center of the beam to the satellite according to the obtained position information, and then obtains the distance from the ground terminal UE to the satellite and the distance from the beam center to the satellite The difference in signal propagation delay; specifically, the distance from the satellite to the first ground terminal UE to the satellite, or the calculation formula for the distance from the center of the beam to the satellite is:

式中，d为卫星到地面点的距离；Re为地球的平均半径；r为卫星与地心之间的距离；θ为地球中心角，其计算公式为：In the formula, d is the distance from the satellite to the ground point; R e is the average radius of the earth; r is the distance between the satellite and the center of the earth; θ is the center angle of the earth, and its calculation formula is:

其中，和分别为地面点和卫星的经纬度。地面点为地面终端UE或波束中心。in, with are the latitude and longitude of the ground point and the satellite, respectively. The ground point is the ground terminal UE or beam center.

UE相对于波束中心到卫星传输的时延差计算公式为：The formula for calculating the delay difference between the UE and the satellite transmission relative to the beam center is:

式中，Δτ为所求的时延差；c为光的传播速度；d和dr分别为地面终端UE和波束中心与卫星之间的距离，如图2所示。In the formula, Δτ is the time delay difference; c is the propagation speed of light; d and d r are the distances between the ground terminal UE and the beam center and the satellite, respectively, as shown in Figure 2.

S4：第一地面终端UE根据步骤S3计算得到的时延差Δτ，相对于位于波束中心位置处的第二地面终端，提前该时延差的时长发送上行信号。具体地，地面终端UE发送上行信号的时刻为t0，则位于波束中心位置处的第二地面终端发送上行信号的时刻为t0+Δτ。通过对地面终端发射上行信号进行定时调整，使得不同地面终端发射的信号同时到达卫星，实现卫星接收端定时同步。S4: According to the time delay difference Δτ calculated in step S3, the first ground terminal UE sends an uplink signal in advance of the time delay difference with respect to the second ground terminal located at the center of the beam. Specifically, the time when the ground terminal UE sends the uplink signal is t 0 , and the time when the second ground terminal located at the center of the beam sends the uplink signal is t 0 +Δτ. By adjusting the timing of the uplink signals transmitted by the ground terminal, the signals transmitted by different ground terminals arrive at the satellite at the same time, and the timing synchronization of the satellite receiving terminal is realized.

Claims (5)

1. A satellite mobile communication uplink transmitting terminal timing adjustment method based on an LTE system is characterized by comprising the following steps:
(1) the method comprises the steps that a first ground terminal obtains at least one wave beam projected to the ground by a satellite, and self-position information is determined from the wave beam;
(2) receiving a pilot signal transmitted by a satellite, acquiring satellite ephemeris data at the latest moment, and further determining satellite position information and beam center position information at the current moment;
(3) calculating the distance between the first ground terminal and the satellite and the distance between the beam center and the satellite according to the self-position information, the satellite position information and the beam center position information, and acquiring the time delay difference between the first time required by signal propagation from the self to the satellite and the second time required by signal propagation from the beam center to the satellite;
(4) and relative to a second ground terminal positioned at the central position of the wave beam, the first ground terminal sends an uplink signal in advance of the time delay difference.
2. The method of claim 1, wherein the communication regime for the satellite is LTE.
3. The method of claim 1, wherein in step (3), the distance from the first ground terminal or the beam center to the satellite is calculated by the formula:
<mrow> <mi>d</mi> <mo>=</mo> <msqrt> <mrow> <msubsup> <mi>R</mi> <mi>e</mi> <mn>2</mn> </msubsup> <mo>+</mo> <msup> <mi>r</mi> <mn>2</mn> </msup> <mo>-</mo> <mn>2</mn> <msub> <mi>R</mi> <mi>e</mi> </msub> <mi>r</mi> <mi> </mi> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&amp;theta;</mi> </mrow> </msqrt> <mo>;</mo> </mrow>
in the formula, d is the required distance; reIs the average radius of the earth; r is the distance between the satellite and the geocentric; theta is the earth central angle, and the calculation formula is as follows:
wherein,andrespectively the longitude and latitude of the ground point and the satellite; the ground point is a first ground terminal position or a beam center position.
4. The method of claim 3, wherein the delay spread is calculated by:
<mrow> <mi>&amp;Delta;</mi> <mi>&amp;tau;</mi> <mo>=</mo> <mfrac> <mrow> <mo>|</mo> <mi>d</mi> <mo>-</mo> <msub> <mi>d</mi> <mi>r</mi> </msub> <mo>|</mo> </mrow> <mi>c</mi> </mfrac> <mo>;</mo> </mrow>
in the formula, delta tau is the time delay difference; c is the propagation speed of the light; d is the distance from the first ground terminal to the satellite, drThe distance from the beam center position to the satellite.
5. The method of claim 1, wherein the location information comprises a longitude, a latitude, and an altitude.
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