CN104219718B - Switching method and apparatus within a satellite communication system - Google Patents

Switching method and apparatus within a satellite communication system Download PDF

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Publication number
CN104219718B
CN104219718B CN201410427852.9A CN201410427852A CN104219718B CN 104219718 B CN104219718 B CN 104219718B CN 201410427852 A CN201410427852 A CN 201410427852A CN 104219718 B CN104219718 B CN 104219718B
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mobile terminal
cell
signal level
satellite
ground station
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CN104219718A (en
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杨国英
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邦彦技术股份有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/14Relay systems
    • H04B7/15Active relay systems
    • H04B7/185Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18539Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
    • H04B7/18541Arrangements for managing radio, resources, i.e. for establishing or releasing a connection for handover of resources

Abstract

本发明公开了卫星通信系统内的切换方法和装置。 The present invention discloses apparatus and method for switching the satellite communication system. 方法包括步骤:S10,地面站监测移动终端位置信息;S20,当移动终端位置到达设定区域时,通知移动终端监测当前小区和至少一个相邻小区的信号水平;S30,移动终端将监测到各小区的信号水平信息发送到地面站;S40,地面站根据移动终端位置信息和各小区信号水平信息做出移动终端和小区的切换决策。 The method comprising the steps of: S10, the ground station monitoring mobile terminal location information; S20, when the mobile terminal reaches the position of the set area, the current cell notifies the mobile terminal monitors the signal level and the at least one neighboring cell; S30, each of the monitored mobile terminal cell signal level information is sent to the ground station; S40, a ground station and a mobile terminal makes a handover decision based on cell position information of the mobile terminal and each cell signal level information. 装置包括:位置监测模块、信号水平监测模块以及切换模块。 Apparatus comprising: a position monitoring module, monitoring module, and the signal level of a switching module. 本发明通过采用基于位置信息以及信号水平的方法,进行卫星网络切换,使得切换的准确度大大提高,降低切换延时,而且整个切换过程系统开销较小,从而有效提高切换效率。 By using the present invention is a method based on the position information and the signal level of the satellite network switching, such that the switching accuracy greatly improved, reducing the handoff latency, and system overhead smaller overall handover process, so as to effectively improve the handover efficiency. 本发明可广泛应用于各种卫星通信系统。 The present invention can be widely applied to various satellite communication systems.

Description

_种卫星通信系统内的切换方法和装置 _ Switching methods and apparatus in a satellite communication system

技术领域 FIELD

[0001] 本发明涉及卫星通信系统,尤其涉及一种卫星通信内的切换方法,本发明还涉及一种卫星通信系统内的切换装置。 [0001] The present invention relates to satellite communication systems and more particularly relates to a method for switching the satellite communication, the invention also relates to a switching device within a satellite communication system.

背景技术 Background technique

[0002] 小区:卫星的一个波束覆盖区。 [0002] The cell: a satellite beam coverage region.

[0003] SACCH: Slow Associated Control Channel,慢速随路控制信道,属于上行和下行信道,采用点对点的方式传播。 [0003] SACCH: Slow Associated Control Channel, a slow associated control channel belonging to uplink and downlink channels using point to point mode of transmission.

[0004] CCS:Common Channel Signaling,公共信道信令,以时分方式在一条高速数据链路上传送一群话路的信令方式。 [0004] CCS: Common Channel Signaling, common channel signaling, the signaling transmission mode in a time division manner a group session in a high speed data link.

[0005] TCH:Traffic Channel,业务信道,传输话音和数据。 [0005] TCH: Traffic Channel, the traffic channel, transmission of voice and data.

[0006] 滑动窗口:sliding window,为滤波器窗口,起到对测量信息的合理抽样的作用。 [0006] The sliding window: sliding window, the window is a filter, acts on the plausibility of the sampling information.

[0007] 卫星通信有着覆盖范围广、受地域条件限制少等优点,卫星网络已成为目前一种非常重要的通信手段,受到国内外的广泛关注。 [0007] satellite communication has wide coverage, and less subject to geographical constraints, etc., satellite networks has become a very important means of communication, widespread concern at home and abroad. 由于卫星和移动终端的移动过程,卫星和移动终端之间的相对位置在发生变化,且每一颗卫星的覆盖范围是有限的,这就造成终端与小区切换问题。 Since the relative position between the movement of the satellite and the mobile terminal, and a mobile satellite terminal is changing, and the coverage of each satellite is limited, which causes the cell switching terminal problem.

[0008] 目前的卫星通信系统内的切换方法主要是包括以下几种: [0008] The method of switching in a current satellite communication system mainly comprises the following:

[0009] 方法1:同一卫星下的两个小区间的切换,卫星接入点向卫星终端发起切换命令并等待设定时长后,在接收到卫星终端返回的切换完成消息之前,即可判定卫星终端已与目标小区完成同步,并开始调度卫星终端进行数据传输,该方法缩短卫星通信系统内的传输时延,保证了卫星终端的业务性能,以及卫星通信系统的整体性能。 [0009] Method 1: after a handover between two cells under the same satellite, the satellite access point waits a long time to set and initiates a handover command to the satellite terminal, before receiving the handover completion message returned from the satellite terminal, a satellite can be determined the terminal has completed synchronization with the target cell, and starts the satellite terminal scheduled for data transmission, the method to shorten the transmission delay of the satellite communications system to ensure the overall performance of the business performance of the satellite terminal and satellite communication systems. 但是该方法存在切换不准确问题,从而导致通话中断或者影响切换质量。 But there is no accurate switching problem with this approach, leading to dropped calls or switching affect quality.

[0010] 方法2提出一种基于主动邻居选择的卫星网络切换备份方法,该方法在当前服务卫星监测到移动终端可能要发生越区切换时,通知其所有邻居卫星监测移动终端的功率值,等待一段时间后所有邻居卫星再次对移动终端的功率值进行监测,将当前服务卫星的每个邻居卫星两次监测的结果相减后得到一个功率差值集合,随后将该功率差值几个中值大于预定阈值的卫星作为候选卫星,并将移动终端的某些重要信息提前备份到候选卫星上,因此在移动终端真正发生越区时,利用备份的信息可以及时将移动终端与提供服务的卫星建立连接,降低越区切换过程中通信中断的概率,保障用户的通信质量。 [0010] 2 proposes a method of neighbor selection based on active backup satellite network switching method of a mobile terminal may monitor the handover to occur, the power values ​​of all the neighbor notify the mobile terminal in a satellite monitoring the current servicing satellite, waiting again all the neighbor satellite power value of the mobile terminal after a period of monitoring, the current serving to monitor the results of two satellites each neighbor satellites to obtain a power difference set after subtraction, then the power difference value several greater than a predetermined threshold value as a candidate satellite satellite, some important information of the mobile terminal in advance and backed up to the candidate satellites, so when the mobile terminal handoff actually occurs, the backup information may use the mobile terminal to establish timely servicing satellite connection, reducing the probability of a handover process of communication interruption, ensuring the communication quality of the user. 但是该方法需要在邻居卫星和当前卫星之间进行多次通信,具有产生的开销较大,切换时间长等问题。 However, this method requires multiple communications between the satellite and the current neighbor satellites, having a large overhead, a long switching time problem arises.

发明内容 SUMMARY

[0011] 为了解决上述技术问题,本发明的目的是提供一种有效提高卫星通信系统内切换效率并且系统开销小的切换方法。 [0011] In order to solve the above problems, an object of the present invention is to provide an efficient method of improving the efficiency of switching the switching system and a satellite communication system overhead is small.

[0012] 为了解决上述技术问题,本发明的目的是提供一种有效提高卫星通信系统内切换效率并且系统开销小的切换装置。 [0012] In order to solve the above problems, an object of the present invention to provide an effective means to improve the switching efficiency of the switching system and a satellite communication system overhead is small.

[0013] 本发明所采用的技术方案是: [0013] The technical proposal of the present invention is:

[0014] 一种卫星通信系统内的切换方法,其包括步骤: [0014] A method for switching the satellite communication system, comprising the steps of:

[0015] SlO,地面站监测移动终端位置信息; [0015] SlO, the ground station to monitor the location information of the mobile terminal;

[0016] S20,当移动终端位置到达设定区域时,通知移动终端监测当前小区和至少一个相邻小区的信号水平; [0016] S20, when the mobile terminal reaches the position of the set area, the current cell notifies the mobile terminal monitors the signal level and at least one neighboring cell;

[0017] S30,移动终端将监测到各小区的信号水平信息发送到地面站; [0017] S30, the mobile terminal transmits the monitored signal level information of each cell to the ground station;

[0018] S40,地面站根据移动终端位置信息和各小区信号水平信息做出移动终端和小区的切换决策。 [0018] S40, the ground station and the mobile terminal makes a handover decision based on cell position information of the mobile terminal and each cell signal level information.

[0019] 优选的,所述步骤S40包括子步骤: [0019] Preferably, the step S40 comprises substeps of:

[0020] S41,地面站监测移动终端位置信息是否到达最佳切换区域&和各小区信号水平信息; [0020] S41, the ground station to monitor the location information of the mobile terminal has reached the optimum switching region & amp; and each cell signal level information;

[0021] S42,移动终端位置信息进入最佳切换区域时,选择信号水平最高的小区作为切换目标小区。 [0021] S42, the mobile terminal location information into the best handover region, the highest level of the selection signal as a handover target cell cell.

[0022] 优选的,步骤S42所述最佳切换区域&为 [0022] Preferably, the step S42 the optimum handover area & amp; is

Figure CN104219718BD00051

,其中,Lmax为当前小区中心到相邻小区中心的距离,Lmax/2为当前小区中心到相邻小区中心的中点位置, 編?为设定的偏差值。 Wherein, Lmax of the current cell center to center distance between adjacent cells, Lmax / 2 for the current cell to the neutral center position of the center of the adjacent cell, compiled? Offset value is set.

[0023] 优选的,所述步骤S20包括子步骤: [0023] Preferably, the step S20 comprises substeps of:

[0024] S21,当地面站监测到移动终端位置到达设定区域时,地面站通过SACCH信道通知移动终端监测当前小区和至少一个相邻小区的信号水平; [0024] S21, when the ground station to the mobile terminal to monitor the position reaches the set area, the ground station through the SACCH notifies the mobile terminal monitors the signal level of the current cell and the at least one neighboring cell;

[0025] S22,移动终端通过CCS信道监测当前小区和至少一个相邻小区的信号水平。 [0025] S22, the mobile terminal monitors the signal level of the current cell and the at least one neighboring cell by the CCS channel.

[0026] 优选的,所述步骤S30具体为:移动终端将监测到各小区的信号水平信息通过SACCH信道周期性地发送到地面站。 [0026] Preferably, the step S30 is specifically: the mobile terminal to monitor the signal level of each cell of information to the ground station through the SACCH periodically.

[0027] 优选的,所述步骤S30包括子步骤: [0027] Preferably, the step S30 comprises substeps of:

[0028] S31,移动终端通过滑动窗口对各小区的信号水平信息进行测量抽样; [0028] S31, the mobile terminal performs measurement samples of the signal level of each cell of information through the sliding window;

[0029] S32,移动终端将监测到各小区的信号水平信息通过SACCH信道周期性地发送到地面站。 [0029] S32, the mobile terminal will monitor the signal level of each cell of information to the ground station through the SACCH periodically.

[0030] 优选的,所述步骤SlO包括子步骤: [0030] Preferably, said step SlO comprises the substeps of:

[0031] SI 1,在卫星通信系统所处的空间中建立坐标系; [0031] SI 1, which coordinate system is established in the space of a satellite communication system;

[0032] S12,获取卫星在坐标系中的卫星位置S; [0032] S12, the acquisition of satellite S in the satellite position coordinate system;

[0033] S13,获取从卫星到移动终端的多普勒频移fdl&及时延td,获取卫星在卫星运动方向上的多普勒频移fd; [0033] S13, the mobile terminal from the satellite to obtain the Doppler shift fdl & amp; and delay td, acquired satellites in the satellite Doppler frequency shift movement direction FD;

[0034] S14,根据541、〖<^<1和移动终端位置?之间的关系,计算出移动终端位置? The relationship between [0034] S14, in accordance with 541, 〖<^ <1 and a mobile terminal position?, The mobile terminal calculates the position? ;

[0035] 所述步骤Sl 2和Sl 3无先后顺序。 [0035] The step Sl 2 and Sl 3 in no particular order.

[0036] 优选的,其特征在于,其还包括步骤: [0036] Preferably, wherein, further comprising the step of:

[0037] S50,在目标小区分配一个新的TCH信道,地面站通过SACCH信道指示移动终端切换到新的TCH信道上; [0037] S50, allocates a new TCH channel in the target cell, the mobile terminal indicating the ground station switches to a new channel via the SACCH TCH;

[0038] S60,移动终端切换到新的TCH信道,并通过SACCH信道告知LES成功接收新的TCH信道上的切换命令; [0038] S60, the mobile terminal switches to the new TCH channel, and successfully receive a new TCH channel switch command tells LES via the SACCH;

[0039] S70,地面站通过SACCH信道接收到确认信息,并释放旧的TCH信道。 [0039] S70, the ground station receives an acknowledgment via the SACCH information, and to release the old TCH channel.

[0040] 一种卫星通信系统内的切换装置,其包括: [0040] A handover apparatus in a satellite communication system, comprising:

[0041] 位置监测模块,设置在地面站上,用于监测移动终端的位置信息; [0041] The position monitoring module, the ground station is provided for monitoring the position information of the mobile terminal;

[0042] 信号水平监测模块,用于根据地面站的命令监测当前小区和至少一个相邻小区的信号水平; [0042] The signal level monitoring means for monitoring the signal level of the current cell and the neighboring cell based on the at least one ground station command;

[0043] 切换模块,用于接收位置监测模块的移动终端位置信息和信号水平监测模块的各小区信号水平信息,并根据这些信息做出移动终端和小区的切换决策。 [0043] The switching module, each cell signal level information monitoring module for receiving position information of the mobile terminal location and the signal level of the monitoring module, and the mobile terminal makes a handover decision based on the information and the cell.

[0044] 优选的,所述切换模块包括: [0044] Preferably, the switching module comprises:

[0045] 位置判断子模块,用于判断移动终端位置信息是否进入最佳切换区域;和 [0045] The position determination sub-module, configured to determine whether the mobile terminal location information into the best handover region; and

[0046] 目标小区选择子模块,用于当移动终端位置信息进入最佳切换区域时,比较各小区信号水平并选择信号水平最高小区作为切换目标小区。 [0046] The target cell selection sub-module, configured to, when the mobile terminal location information into the best handover region, comparing the cell selection signal and the signal level as the highest level of cell handover target cell.

[0047] 本发明的有益效果是: [0047] Advantageous effects of the present invention are:

[0048] 本发明一种卫星通信系统内的切换方法通过采用基于位置信息以及信号水平的方法,进行卫星网络切换,使得切换的准确度大大提高,降低切换延时,而且整个切换过程系统开销较小,从而有效提高切换效率。 [0048] A method for switching the satellite communication system of the present invention by a method based on the position information and the signal level of the satellite network switching, such that the switching accuracy greatly improved, reducing the handoff latency and the more system overhead entire handover procedure small, thereby effectively improve the handover efficiency.

[0049] 本发明一种卫星通信系统内的切换装置通过采用位置监测模块和信号水平监测模块分别监测移动终端位置信息和各小区信号水平信息,并根据这些信息进行卫星网络切换,使得切换的准确度大大提高,降低切换延时,而且整个切换过程系统开销较小,从而有效提高切换效率。 [0049] The switching device within a satellite communication system of the present invention is monitored by a monitoring module and a use position monitoring module, respectively, the signal level of the mobile terminal location information and signal level information of each cell, and a satellite network handover according to the information, so that the switching accuracy greatly improved, reducing the handoff latency, and system overhead smaller overall handover process, so as to effectively improve the handover efficiency.

附图说明 BRIEF DESCRIPTION

[0050] 下面结合附图对本发明的具体实施方式作进一步说明: [0050] DETAILED DESCRIPTION OF THE DRAWINGS Embodiment of the present invention will be further described:

[0051] 图1是本发明移动终端越区切换的系统结构示意图; [0051] FIG. 1 is a schematic system configuration of a mobile terminal handoff present invention;

[0052] 图2是本发明系统位置关系的示意图; [0052] FIG. 2 is a schematic diagram of the system of the present invention, the positional relationship;

[0053] 图3是本发明一种卫星通信系统内的切换装置一种实施例的结构示意图。 [0053] FIG. 3 is a schematic view of the switching device within a satellite communication system according to an embodiment of the present invention.

具体实施方式 Detailed ways

[0054] 需要说明的是,在不冲突的情况下,本申请中的实施例及实施例中的特征可以相互组合。 [0054] Incidentally, in the case of no conflict, embodiments and features of the embodiments of the present application can be combined with each other.

[0055] 如图1和图2所示,一种卫星通信系统内的切换方法,下面详述每一步骤的具体实施过程。 [0055] FIGS. 1 and 2, a method for switching the satellite communication system, the following detailed description of specific embodiments of the process of each step.

[0056] SlO,地面站监测移动终端位置信息;其包括子步骤: [0056] SlO, the ground station to monitor the location information of the mobile terminal; comprising the substeps of:

[0057] SI 1,在卫星通信系统所处的空间中建立坐标系; [0057] SI 1, which coordinate system is established in the space of a satellite communication system;

[0058] Sl 2,获取卫星在坐标系中的卫星位置S; [0058] Sl 2, acquires the position of the satellite S is a satellite coordinate system;

[0059] S13,获取从卫星到移动终端的多普勒频移fdl&amp;及时延td,获取卫星在卫星运动方向上的多普勒频移fd; [0059] S13, the mobile terminal from the satellite to obtain the Doppler shift fdl & amp; and delay td, acquired satellites in the satellite Doppler frequency shift movement direction FD;

[0060] S14,根据S、fdi、td、fd和移动终端位置P之间的关系,计算出移动终端位置P; [0060] S14, the relationship between S, fdi, td, fd, and the mobile terminal positions P, the mobile terminal calculates the position P;

[0061] 所述步骤S12和S13无先后顺序。 [0061] The steps S12 and S13 in no particular order.

[0062] 下面以图2在卫星通信系统中建立三维直角坐标系为例,详述移动终端位置信息的获取方法: [0062] FIG. 2 below to establish a three-dimensional rectangular coordinate system in a satellite communication system, for example, the method of acquiring detailed position information of the mobile terminal:

[0063] Sll,在卫星通信系统所处的空间中建立三维直角坐标系(X,Y,Z)。 [0063] Sll, dimensional Cartesian coordinate system (X, Y, Z) in a space in which the satellite communication system. 三维直角坐标系的中心为地球中心0,(Υ,ζ)平面为卫星移动轨道平面,即卫星在X轴方向的分量为0。 Central three-dimensional orthogonal coordinate system is the center of the Earth 0, (Υ, ζ) plane is a mobile satellite orbital plane, i.e., in the X-axis direction components of a satellite is zero. 其中,移动终端位于坐标系中的P (Xp,yP,ΖΡ)处,卫星位于点S (Xs,ys,Zs)处,卫星移动速度为V。 Wherein the mobile terminal is located in the coordinate system P (Xp, yP, ΖΡ) at the satellite at point S (Xs, ys, Zs), the satellite moving speed V. SP为卫星位置S与移动终端位置P的连线,SO为卫星位置与原点的连线,SO的值为常数值(R+ H),其中R为地球半径,H为卫星离地面的高度。 SP is the S position and the satellite position P connecting the mobile terminal, SO origin position satellite connection, SO value is a constant value (R + H), where R is the radius of the earth, H is the height of the satellite from the ground. C为从S沿卫星移动方向延长R+H距离的点,SC 为卫星位置S与点C之间的连线,Θ为卫星移动方向与SP之间的夹角,γ为卫星位置与原点的连线SO与Z轴之间的夹角,。 C is the extension in the direction of the satellite from the mobile S + H point distance R, SC is the connection between the satellite position S and the point C, Θ is the angle between the moving direction of the satellite's SP, γ is the satellite position from the origin SO angle between the connection and the Z-axis.

[0064] S12,获取卫星在坐标系中的卫星位置S; [0064] S12, the acquisition of satellite S in the satellite position coordinate system;

[0065] S13,获取从卫星到移动终端的多普勒频移fdl&amp;及时延td,获取卫星在卫星运动方向上的多普勒频移fd; [0065] S13, the mobile terminal from the satellite to obtain the Doppler shift fdl & amp; and delay td, acquired satellites in the satellite Doppler frequency shift movement direction FD;

[0066] S14,根据5^(114(14(1和移动终端位置?之间的关系,计算出移动终端位置?;所述步骤Sl 2和Sl 3无先后顺序。即可先获取卫星位置S,也可先获取其他数值。 ? [0066] S14, the relationship between ^ 5 (114 (14 (position 1 and the mobile terminal, calculates the position of the mobile terminal;? Step Sl 2 and Sl 3 in no particular order to obtain the first position of the satellite S. , but also the first to obtain additional value.

[0067] 步骤Sll所述坐标系为以地球中心为原点0的三维直角坐标系,步骤S12中卫星位置S的坐标为(xs,ys,zs),步骤S5中终端位置P的坐标为(Xp,yP,Zp)。 [0067] Step Sll the center of the earth coordinate system to 0 as an origin dimensional rectangular coordinate system, the coordinate position of the satellite in step S12 is S (xs, ys, zs), in step S5, the coordinate position P of the terminal (Xp , yP, Zp). 所述卫星位置S位于坐标系Y轴和Z轴组成的YZ平面上,所述步骤Sl 2包括子步骤: The satellite position on the YZ plane S coordinate system is located in the Y-axis and Z-axis component, the step Sl 2 comprises the sub-steps of:

[0068] 获取卫星位置与原点的连线SO与Z轴之间的夹角γ,卫星离地面高度H,地球半径R;可通过卫星地面站得到γ的值。 [0068] The angle γ between the origin position of the acquired satellite connection SO Z-axis, the satellite from the ground height H, the radius of the earth R & lt; γ value may be obtained by a satellite ground station.

[0069] 根据关系式 [0069] according to the relationship

[0070] [0070]

Figure CN104219718BD00071

[0071] 计算得出卫星位置S (Xs,ys,Zs)。 [0071] The calculated satellite position S (Xs, ys, Zs).

[0072] 所述步骤S40包括子步骤: [0072] The step S40 comprises substeps of:

[0073] 根据第一关系式: [0073] According to a first relation formula:

[0074] [0074]

Figure CN104219718BD00072

[0075] 计算得出卫星移动方向与SP之间的夹角Θ,其中,SP为卫星位置S与移动终端位置P 的连线;其中f dl、td、fd的值可以通过卫星地面站测量得到。 [0075] calculated the angle Θ between the direction of the mobile satellite SP, wherein, SP is the S position and the satellite position P of the connection of the mobile terminal; wherein the value of f dl, td, fd can be obtained by measuring the satellite earth stations .

[0076] 根据角度Θ与点S、P、C之间的关系可以得到第二关系式: [0076] The angle Θ and the point S, P, C can be obtained the relationship between the second relationship:

[0077] [0077]

Figure CN104219718BD00073

[0078] 其中,C为从S沿卫星移动方向延长R+H距离的点,其位置(Xc,yc,Zc)满足关系式: [0078] wherein, C is the extension of the distance R + H point S in the direction of the satellite from the mobile, the position (Xc, yc, Zc) satisfy the relationship:

[0079] [0079]

Figure CN104219718BD00081

[0080] SC为卫星位置S与点C之间的连线, [0080] SC as a connection between the position of the satellite S and points C,

[0081] 为SP在X轴方向上的分量,满足第三关系式: [0081] The SP component in the X-axis direction, satisfies the third relationship:

[0082] [0082]

Figure CN104219718BD00082

[0083] 为SC在X轴方向的分量,满足第四关系式: [0083] The component SC in the X axis direction satisfy the relationship of formula IV:

[0084] [0084]

Figure CN104219718BD00083

[0085] COS丨S:P.. }为SP在Y轴方向上的分量,满足第五关系式: [0085] COS Shu S: P ..} is a SP component in the Y-axis direction satisfy the relationship of formula V:

[0086] [0086]

Figure CN104219718BD00084

[0087] 为SC在Y轴方向的分量,满足第六关系式: [0087] The SC component in Y-axis direction satisfy the relationship of formula VI:

[0088] [0088]

Figure CN104219718BD00085

[0089] 为SP在Z轴方向上的分量,满足第七关系式: [0089] The SP component in the Z-axis direction satisfy the relationship of formula VII:

[0090] [0090]

Figure CN104219718BD00086

[0091] I为SC在Z轴方向的分量,满足第八关系式: [0091] I is a component SC in the Z axis direction satisfy the relationship of formula VIII:

[0092] [0092]

Figure CN104219718BD00087

[0093] 根据移动终端到卫星的时延td与距离的关系得到第九关系式: [0093] The resulting relationship ninth delay td relationship and distance of the mobile terminal to the satellite:

[0094] [0094]

Figure CN104219718BD00088

[0095] 其中,c为光速; [0095] wherein, c is the speed of light;

[0096] 根据移动终端在地面上,得到第十关系式: [0096] The mobile terminal on the ground, to give the tenth relationship:

[0097] [0097]

Figure CN104219718BD00091

[0098] 根据第一至第十关系式计算得到终端位置? [0098] According to a first terminal location is calculated through tenth relationship? (办,^,如)。 (Office, ^, as).

[0099] 其中,在卫星位置S (Xs,ys,Zs),Θ,C (Xc,yc,Zc)的数值已知或已求得的情况下,可将第三至第八关系式代入第二关系式后与第九关系式、第十关系式三个关系式可求得三个未知变量xP、yP、zP,从而获得移动终端位置P (xP,yP,zP)。 [0099] wherein, in the satellite position S (Xs, ys, Zs), Θ, the value C (Xc, yc, Zc) known or determined, the third to eighth may be substituted into the relational expression of after two relationships ninth relationships, three tenth relationship relationship can be obtained three unknown variables xP, yP, zP, thereby obtaining the mobile terminal position P (xP, yP, zP).

[0100] 上述步骤Sio的实施例通过利用卫星系统中已知的位置和信息以及这些位置和信息之间的关系,从而实现了对移动终端的位置信息进行精确定位,而无需在移动终端内设置定位装置,节省了成本,更能满足实时性要求高、不能被测移动终端感知到的应用环境。 [0100] Example by using the above-described step Sio satellite systems and the known relationship between the position information and the information between these positions and, thus realizing the position information of the mobile terminal accurately position, without providing the mobile terminal positioning means cost savings, better meet real-time requirements, the mobile terminal can not be perceived by the test application environment.

[0101] 步骤S20,当移动终端位置到达设定区域时,通知移动终端监测当前小区和至少一个相邻小区的信号水平;其中,设定区域可以根据各卫星波束覆盖区域不同的情况设定,一般为以两个小区的交叉区域的中心点为中心的附近区域。 [0101] step S20, the mobile terminal when the position reaches the set area, the current cell notifies the mobile terminal monitors the signal level and the at least one neighboring cell; wherein the setting area may be set according to different cases for each satellite beam coverage area, generally center point of the intersection region of the two cells in the vicinity of the center region. 步骤S20还包括子步骤: Step S20 further comprises the substeps of:

[0102] S21,当地面站监测到移动终端位置到达设定区域时,地面站通过SACCH信道通知移动终端监测当前小区和至少一个相邻小区的信号水平; [0102] S21, when the ground station to the mobile terminal to monitor the position reaches the set area, the ground station through the SACCH notifies the mobile terminal monitors the signal level of the current cell and the at least one neighboring cell;

[0103] S22,移动终端通过CCS信道监测当前小区和至少一个相邻小区的信号水平。 [0103] S22, the mobile terminal monitors the signal level of the current cell and the at least one neighboring cell by the CCS channel.

[0104] 步骤S30,移动终端将监测到各小区的信号水平信息发送到地面站;具体为:移动终端将监测到各小区的信号水平信息通过SACCH信道周期性地发送到地面站。 [0104] step S30, the mobile terminal monitors the signal level information of each cell is transmitted to the ground station; specifically as follows: the mobile terminal to monitor the signal level of each cell of information to the ground station through the SACCH periodically. 其包括子步骤: Comprising the substeps of:

[0105] S31,移动终端通过滑动窗口对各小区的信号水平信息进行测量抽样;滑动窗口被应用来测量抽样,来减少多径效应对信号水平的影响。 [0105] S31, the mobile terminal through the sliding window on the signal level information of measurement samples of each cell; sliding window is applied to the measurement samples, to reduce the influence of multipath effect on signal level. 平均抽样的数量被选择为10,这样窗口长度远远低于小区切换时间。 The average number of sampling is selected to be 10, so that the window length much lower than the switching time of the cell.

[0106] S32,移动终端将监测到各小区的信号水平信息通过SACCH信道周期性地发送到地面站。 [0106] S32, the mobile terminal will monitor the signal level of each cell of information to the ground station through the SACCH periodically.

[0107] 步骤S40,地面站根据移动终端位置信息和各小区信号水平信息做出移动终端和小区的切换决策。 [0107] step S40, the ground station and the mobile terminal makes a handover decision based on the cell the mobile terminal location information and signal level information of each cell. 其包括子步骤: Comprising the substeps of:

[0108] S41,地面站监测移动终端位置信息是否到达最佳切换区域&amp;和各小区信号水平信息; [0108] S41, the ground station to monitor the location information of the mobile terminal has reached the optimum switching region & amp; and each cell signal level information;

[0109] S42,移动终端位置信息进入最佳切换区域时,选择信号水平最高的小区作为切换目标小区。 [0109] S42, the mobile terminal location information into the best handover region, the highest level of the selection signal as a handover target cell cell.

[0110] 步骤S42所述最佳切换区域队可以根据需要具体设定,该实施例中,队设定为 [0110] The step S42 may be the best team handover region set according to the specific needs, in this embodiment, is set to team

Figure CN104219718BD00092

,其中,Lmax为当前小区中心到相邻小区中心的距离,Lmax/2为当前小区中心到相邻小区中心的中点位置,为设定的偏差值,这里_的值为若终端位置位于&amp;区域时,其信号水平差值应该满足以下条件: Wherein, Lmax of the current cell center to center distance between adjacent cells, Lmax / 2 for the current cell to the neutral center position of the center of the adjacent cell, as the deviation value setting, where _ If the terminal is located in the & amp ; when region horizontal difference signal which should meet the following criteria:

[0111] [0111]

Figure CN104219718BD00093

[0112] 其中,遍!(¾为当前小区与目标小区信号之间的差值, [0112] where, over! (¾ as the difference between the current cell and the target cell signal,

Figure CN104219718BD00101

为最佳切换区域&amp;内当前小区与目标小区信号之间最大信号差值。 Best handover area & amp; maximum signal difference between the current cell and the target cell within the signal.

[0113] 地面站根据接收到的各小区的信号水平信息生成“可选目标小区列表”,“可选目标小区列表”包括以下信息:当前服务小区的平均接收信号水平、周围小区的接收信号水平、功率预算等。 [0113] generating a ground station "Optional list of the target cell" in accordance with the signal level of each received cell information, "the list of selectable target cell" includes the following information: the current average received signal level of the serving cell received signal level of the surrounding cells The power budget. 并且可选小区列表中的小区按照接收到的周围小区的信号水平降序排列。 And optionally cell list cells descending order of received signal levels of surrounding cells. 地面站通过比较可选小区列表中不同的小区接收到的信号水平以及移动终端位置信息,从可选列表中选择其中信号水平最高的一个小区作为切换的目标小区。 Optional ground station by comparing the signal level of the different cell list of cells received and the mobile terminal location information, select the highest signal level from a cell as a target cell in a selectable list handover.

[0114] 选定目标小区之后,具体的切换过程包括步骤: [0114] Following the selection of the target cells, specific handover procedure comprising the steps of:

[0115] S50,在目标小区分配一个新的TCH信道,地面站通过SACCH信道指示移动终端切换到新的TCH信道上; [0115] S50, allocates a new TCH channel in the target cell, the mobile terminal indicating the ground station switches to a new channel via the SACCH TCH;

[0116] S60,移动终端切换到新的TCH信道,并通过SACCH信道告知LES成功接收新的TCH信道上的切换命令; [0116] S60, the mobile terminal switches to the new TCH channel, and successfully receive a new TCH channel switch command tells LES via the SACCH;

[0117] S70,地面站通过SACCH信道接收到确认信息,并释放旧的TCH信道。 [0117] S70, the ground station receives an acknowledgment via the SACCH information, and to release the old TCH channel.

[0118] —种卫星通信系统内的切换装置,其结构如图3所示,其原理和功能对应于一种卫星通信系统内的切换方法,在此不做累述。 [0118] - switching means within a satellite communication system types, the structure shown in FIG, its principles, and the method of switching functions corresponding to a satellite communication system 3, which is not tired.

[0119] 本发明通过采用基于位置信息以及信号水平的方法,进行卫星网络切换,使得切换的准确度大大提高,降低切换延时,而且整个切换过程系统开销较小,从而有效提高切换效率。 [0119] The present invention, by using the method based on the position information and the signal level of the satellite network switching, such that the switching accuracy greatly improved, reducing the handoff latency, and system overhead smaller overall handover process, so as to effectively improve the handover efficiency.

[0120] 以上是对本发明的较佳实施进行了具体说明,但本发明创造并不限于所述实施例,熟悉本领域的技术人员在不违背本发明精神的前提下还可做作出种种的等同变形或替换,这些等同的变形或替换均包含在本申请权利要求所限定的范围内。 [0120] The foregoing is the preferred embodiment of the present invention have been specifically described, but the present invention is not limited to the creation of embodiments, those skilled in the art without departing from the spirit of the present invention may be made to make all kinds of equivalents modification or replacement, such equivalent modifications or substitutions are included in the present application within the scope defined by the claims.

Claims (5)

1. 一种卫星通信系统内的切换方法,其特征在于,其包括步骤: SlO,地面站监测移动终端位置信息; S20,当移动终端位置到达设定区域时,通知移动终端监测当前小区和至少一个相邻小区的信号水平; S30,移动终端将监测到各小区的信号水平信息发送到地面站; S40,地面站根据移动终端位置信息和各小区信号水平信息做出移动终端和小区的切换决策; 所述步骤S40包括子步骤: S41,地面站监测移动终端位置信息是否到达最佳切换区域Bx和各小区信号水平信息; S42,移动终端位置信息进入最佳切换区域时,选择信号水平最高的小区作为切换目标小区; 步骤S42所述最佳切换区域仏为[Lmax/2- Δ X,Lmax/2+ Δ X],其中,Lmax为当前小区中心到相邻小区中心的距离,Lmax/2为当前小区中心到相邻小区中心的中点位置,ΔΧ为设定的偏差值; 所述步骤SlO包括子步骤: SI 1 1. A method of handover in a satellite communications system, characterized in that it comprises the step: SlO, the ground station to monitor the location information of the mobile terminal; S20, when the mobile terminal reaches the position of the set area, notifies the mobile terminal monitors the current cell and at least a signal level of the adjacent cell; S30, the mobile terminal will monitor the signal level information of each cell is transmitted to the ground station; S40, a ground station and a mobile terminal makes a handover decision based on the cell information and the mobile terminal location information of each cell signal level ; said step comprising the sub-steps of S40: S41, the ground station to monitor the location information of the mobile terminal has reached the best handover area Bx and each cell signal level information; when S42, the location information of the mobile terminal into the best handover region, the highest level of the selection signal cell as a handover target cell; step S42 is the best handover area Fo [Lmax / 2- Δ X, Lmax / 2 + Δ X], where, Lmax is the distance from the current cell to the center of the neighboring cell center, Lmax / 2 for the current cell to the neutral central position of the neighboring cell center, ΔΧ offset value is set; said step comprising the sub-steps SlO: SI 1 在卫星通信系统所处的空间中建立坐标系; S12,获取卫星在坐标系中的卫星位置S; 513, 获取从卫星到移动终端的多普勒频移fdi以及时延td,获取卫星在卫星运动方向上的多普勒频移fd; 514, 根据541、〖<^<1和移动终端位置?之间的关系,计算出移动终端位置? In the satellite communication system to establish a space in which the coordinate system; S12, acquires the satellite in satellite position coordinate system S; 513, acquired from the satellite to the mobile terminal fdi and the Doppler shift delay td, acquired satellites in the satellite Doppler frequency shift in the direction of movement of FD;? a relationship between 514, 541 according 〖<^ <1 and a position of the mobile terminal, the mobile terminal calculates the position? ; 所述步骤S12和S13无先后顺序。 ; Step S12 and S13 in no particular order.
2. 根据权利要求1所述的一种卫星通信系统内的切换方法,其特征在于,所述步骤S20 包括子步骤: S21,当地面站监测到移动终端位置到达设定区域时,地面站通过SACCH信道通知移动终端监测当前小区和至少一个相邻小区的信号水平; S22,移动终端通过CCS信道监测当前小区和至少一个相邻小区的信号水平。 The switching method within a satellite communication system according to claim 1, wherein said step comprises the sub step S20: S21, when the ground station to the mobile terminal monitored region reaches the set position, by the ground station the SACCH notifies the mobile terminal monitors the signal level of the current cell and the at least one neighboring cell; S22, the mobile terminal monitors the current cell through the CCS channel and at least one signal level of the adjacent cell.
3. 根据权利要求1所述的一种卫星通信系统内的切换方法,其特征在于,所述步骤S30 具体为:移动终端将监测到各小区的信号水平信息通过SACCH信道周期性地发送到地面站。 The switching method within a satellite communication system according to claim 1, wherein said step S30 specifically is: the mobile terminal to monitor the signal level information of each cell is sent to the surface via the SACCH periodically station.
4. 根据权利要求3所述的一种卫星通信系统内的切换方法,其特征在于,所述步骤S30 包括子步骤: S31,移动终端通过滑动窗口对各小区的信号水平信息进行测量抽样; S32,移动终端将监测到各小区的信号水平信息通过SACCH信道周期性地发送到地面站。 The switching method within a satellite communication system according to claim 3, wherein said step comprises the sub step S30: S31, the mobile terminal performs measurement samples of the signal level information of each cell by a sliding window; S32 , the mobile terminal monitors the signal level information of each cell is transmitted to the ground station through the SACCH periodically.
5. 根据权利要求1至4任一项所述的一种卫星通信系统内的切换方法,其特征在于,其还包括步骤: S50,在目标小区分配一个新的TCH信道,地面站通过SACCH信道指示移动终端切换到新的TCH信道上; S60,移动终端切换到新的TCH信道,并通过SACCH信道告知LES成功接收新的TCH信道上的切换命令; S70,地面站通过SACCH信道接收到确认信息,并释放旧的TCH信道。 1 according to a method for switching the satellite communication system of any one of claims 1-4, characterized in that it further comprises the step of: S50, allocates a new TCH channel in the target cell, the ground station through the SACCH instruct the mobile terminal to switch to the new TCH channel; the S60, the mobile terminal switches to the new TCH channel, and successfully receive a new TCH channel switch command tells LES via the SACCH; S70, the ground station receives the acknowledgment information via the SACCH and releases the old channel TCH.
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