CN1162014C - Method for Estimating the Distance of Mobile Terminals in Digital Mobile Communication System - Google Patents
Method for Estimating the Distance of Mobile Terminals in Digital Mobile Communication System Download PDFInfo
- Publication number
- CN1162014C CN1162014C CNB991168216A CN99116821A CN1162014C CN 1162014 C CN1162014 C CN 1162014C CN B991168216 A CNB991168216 A CN B991168216A CN 99116821 A CN99116821 A CN 99116821A CN 1162014 C CN1162014 C CN 1162014C
- Authority
- CN
- China
- Prior art keywords
- mobile terminal
- distance
- base station
- time
- estimating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
Description
本发明涉及通信技术领域，尤其涉及一种估计数字移动通信系统中移动终端距离的方法。The invention relates to the technical field of communication, in particular to a method for estimating the distance of a mobile terminal in a digital mobile communication system.
在移动通信系统中，数字信息一般是分帧传输，由于移动终端的移动特性将使得其到达基站信息的空中时延每次都可能不一样，这样为计算基站到移动终端的距离，则必须在每次解调之前进行一次搜索，才能解调出数字信息，进而推算出移动终端的距离，程序复杂。所以传统的做法并没有实时计算移动终端的距离，而只是实时确定该移动终端从属于哪一个小区，具体是在哪个小区的哪一个位置是不可知的。In the mobile communication system, digital information is generally transmitted in frames. Due to the mobile characteristics of the mobile terminal, the air delay to reach the base station information may be different each time. In order to calculate the distance from the base station to the mobile terminal, it must be in A search is performed before each demodulation to demodulate the digital information, and then calculate the distance of the mobile terminal. The procedure is complicated. Therefore, the traditional method does not calculate the distance of the mobile terminal in real time, but only determines in real time which cell the mobile terminal belongs to, and the specific location in which cell is unknown.
本发明的目的是为了克服现有对移动终端距离估计的不足而提供的一种搜索程序快速简单、估算移动终端距离精度高的数字移动通信系统中移动终端距离估计的方法。The purpose of the present invention is to provide a method for estimating the distance of a mobile terminal in a digital mobile communication system with a fast and simple search procedure and high precision in estimating the distance of the mobile terminal in order to overcome the existing shortage of distance estimation for the mobile terminal.
实现本发明的技术方案是：一种数字移动通信系统中估计移动终端距离的方法，其特点是，包括以下步骤：The technical solution for realizing the present invention is: a method for estimating the distance of a mobile terminal in a digital mobile communication system, which is characterized in that it comprises the following steps:
①利用基站收到移动终端首次发来的信息估算出移动终端的初始距离；① Estimate the initial distance of the mobile terminal by using the information received by the base station from the mobile terminal for the first time;
②计算移动终端发送信息的时间偏移量；② Calculate the time offset of the information sent by the mobile terminal;
③根据时间偏移量计算移动终端与基站的距离偏移，进而得出移动终端与基站的实时距离；③ Calculate the distance offset between the mobile terminal and the base station according to the time offset, and then obtain the real-time distance between the mobile terminal and the base station;
④不断重复步骤②和③，可得到任何时刻的移动终端与基站间的实时距离。④Continuously repeat steps ② and ③ to obtain the real-time distance between the mobile terminal and the base station at any moment.
上述一种数字移动通信系统中估计移动终端距离的方法，其中：步骤①所述的确定移动终端的初始距离的方法是：The above-mentioned method for estimating the distance of a mobile terminal in a digital mobile communication system, wherein: the method for determining the initial distance of the mobile terminal described in step 1 is:
①-a.判断是否随机接入接收信号；①-a. Judging whether to randomly access the received signal;
①-b.若是随机接入，则利用训练序列相关性的特点计算移动终端的初始距离。①-b. For random access, the initial distance of the mobile terminal is calculated using the characteristics of the training sequence correlation.
上述一种数字移动通信系统中估计移动终端距离的方法，其中：步骤②所述的时间偏移量的获得方法是：The above-mentioned method for estimating the distance of a mobile terminal in a digital mobile communication system, wherein: the method for obtaining the time offset described in step 2. is:
②-a、基站将步骤①所得到的初始时间提前量发送给移动终端，并通知移动终端下一帧提前相应的时间发送；②-a. The base station sends the initial timing advance obtained in step ① to the mobile terminal, and notifies the mobile terminal to send the next frame ahead of the corresponding time;
②-b、基站在下一次收到移动终端的上发数据时，计算相应的时间偏移量。②-b. The base station calculates the corresponding time offset when receiving the data sent by the mobile terminal next time.
上述一种数字移动通信系统中估计移动终端距离的方法，其中：步骤④所述的获得移动终端相对于基站的距离方法是指：将步骤③得到的时间偏移量与初始时间提前量相加，得到基站下次将要通知移动终端的时间提前量；同时利用步骤③得到的时间偏移量可得出移动终端相对于基站的距离偏移量；进而计算出移动终端相对于基站的距离。The above-mentioned method for estimating the distance of a mobile terminal in a digital mobile communication system, wherein: the method for obtaining the distance of the mobile terminal relative to the base station in step ④ refers to: adding the time offset obtained in step ③ to the initial time advance , to obtain the time advance amount that the base station will notify the mobile terminal next time; at the same time, the distance offset of the mobile terminal relative to the base station can be obtained by using the time offset obtained in step ③; and then calculate the distance of the mobile terminal relative to the base station.
上述一种数字移动通信系统中估计移动终端距离的方法，其中：所述的判断是否随机接入接收信号的方法是指依靠能量比较的方法，该方法为：设定一个比较门限m，该门限m的取值范围在80％～95％之间；如果满足条件：
上述一种数字移动通信系统中估计移动终端距离的方法，其中：所述的利用训练序列的相关性来估算移动终端的初始距离的计算公式是：
上述一种数字移动通信系统中估计移动终端距离的方法，其中：所述的基站基准序列位置为移动终端相对于基站无位移时基站接收到的上行序列应处于的位置。The above-mentioned method for estimating the distance of a mobile terminal in a digital mobile communication system, wherein: the reference sequence position of the base station is the position where the uplink sequence received by the base station should be when the mobile terminal has no displacement relative to the base station.
上述一种数字移动通信系统中估计移动终端距离的方法，其中：所述的时间偏移量是指：本次基站接收序列的位置与基站基准序列位置间的比特偏移。The above-mentioned method for estimating the distance of a mobile terminal in a digital mobile communication system, wherein: the time offset refers to the bit offset between the position of the current sequence received by the base station and the position of the reference sequence of the base station.
上述一种数字移动通信系统中估计移动终端距离的方法，其中：所述的移动终端的实时距离的计算公式是：The above-mentioned method for estimating the distance of a mobile terminal in a digital mobile communication system, wherein: the formula for calculating the real-time distance of the mobile terminal is:
移动终端的实时距离＝移动终端上一次与基站的距离+时间偏移量×单位时间偏移量对应的距离偏移。The real-time distance of the mobile terminal=the last distance between the mobile terminal and the base station+time offset×distance offset corresponding to the unit time offset.
由于本发明采用了以上的技术方案，用到GSM在数字移动通信系统中的时间提前量的概念，当基站收到移动终端首次发上来的信息后，利用此信息估算出移动终端的初始距离，然后通知移动终端下一次发送提前相应的时间；以后则每隔一段时间再计算一次时间偏移，补偿因移动终端的移动造成的时间提前量应做的相应改变，同时通过计算出距离偏移，计算出任何时刻的移动终端所处的位置，并使搜索时间缩短、程序简化、估计精度提高。Because the present invention has adopted above technical scheme, used the concept of the time advance amount of GSM in the digital mobile communication system, after the base station receives the information that mobile terminal sends up for the first time, utilize this information to estimate the initial distance of mobile terminal, Then notify the mobile terminal to send the corresponding time ahead of time next time; and then calculate the time offset every other period of time to compensate for the corresponding change in the time advance caused by the movement of the mobile terminal. At the same time, by calculating the distance offset, The position of the mobile terminal at any time is calculated, and the search time is shortened, the program is simplified, and the estimation accuracy is improved.
现结合以下实施例和附图，进一步说明本发明的具体特征、性能。Now with reference to the following examples and accompanying drawings, the specific features and performances of the present invention will be further described.
图1为常规突发序列的包络图；Figure 1 is an envelope diagram of a conventional burst sequence;
图2为随机接入突发序列的包络图；FIG. 2 is an envelope diagram of a random access burst sequence;
图3为噪声的包络图。Figure 3 is the envelope diagram of the noise.
本发明是一种数字移动通信系统中移动终端距离估计的方法，其核心内容就是在基站在收到移动终端首次发上来的信息后，利用此信息估算出移动终端的初始距离，然后通知移动终端下一次发送提前相应的时间；以后则每隔一段时间再计算一次时间偏移，补偿因移动终端的移动造成的时间提前量应做的相应改变。The invention is a method for estimating the distance of a mobile terminal in a digital mobile communication system. Its core content is that after the base station receives the information sent by the mobile terminal for the first time, it uses the information to estimate the initial distance of the mobile terminal, and then notifies the mobile terminal to download One transmission advances the corresponding time; later, the time offset is calculated again at intervals to compensate for the corresponding changes in the time advance caused by the movement of the mobile terminal.
本发明提出的距离估算方法适用于所有的数字移动通信系统。现以GSM数字蜂窝移动通信系统为例加以详细说明。The distance estimation method proposed by the invention is applicable to all digital mobile communication systems. Now take the GSM digital cellular mobile communication system as an example to describe in detail.
GSM系统中，基站需要解调的第一个上行序列是移动终端上发的随机接入序列，基站对移动终端的距离估算也是基于此接收序列。所以实际上初始距离估算过程是分两步进行的：第一步，判断该接收信号是否为随机接入；第二步，若是随机接入，利用训练序列相关性的特点估算移动终端的初始距离。In the GSM system, the first uplink sequence that the base station needs to demodulate is the random access sequence sent by the mobile terminal, and the distance estimation of the base station to the mobile terminal is also based on this received sequence. So in fact, the initial distance estimation process is divided into two steps: the first step is to judge whether the received signal is random access; the second step is to estimate the initial distance of the mobile terminal by using the characteristics of the training sequence correlation .
首先，判断该接收信号是否为随机接入，本发明提出一种包络能量的比较方法，该方法为：设定一个比较门限m，如果满足条件： 则认为是随机接入的接收信号。First, to judge whether the received signal is random access, the present invention proposes a method for comparing envelope energy, the method is: setting a comparison threshold m, if the conditions are met: Then it is regarded as a received signal of random access.
在GSM系统中，当基站在相应的时隙处理随机接入信息时，收到的信息有可能是随机接入、也有可能是干扰或者是常规突发序列，假如我们在解调搜索之前就已经区分出来的话，将能为解调过程节省大量的时间。In the GSM system, when the base station processes random access information in the corresponding time slot, the received information may be random access, interference or regular burst sequence, if we have already If it is distinguished, it will save a lot of time for the demodulation process.
图1～图3所示为常规突发、随机接入突发及噪声的包络图。从图中可看出，随机接入突发得到的主要比特的能量之和(87比特的能量之和)占据整段突发所有比特能量之和(156比特之和)的绝大部分，而常规突发序列和噪声则无此特点，它们156比特的能量分布比较平均。因此可依靠本发明提出的上述计算能量比较的方法，即利用接入突发序列的特点(即与其它突发序列和噪声信号的不同之处)，也就是利用接入突发的总共156比特中主要能量集中的中间87比特上的特点，来区分出接收信号是否为随机接入：设定一个比较门限m，如果满足以下条件：Figures 1 to 3 show the envelope diagrams of conventional bursts, random access bursts, and noise. It can be seen from the figure that the energy sum of the main bits obtained by the random access burst (the sum of 87 bits of energy) occupies most of the sum of all bit energies of the entire burst (the sum of 156 bits), while Conventional burst sequence and noise do not have this feature, and their 156-bit energy distribution is relatively average. Therefore can rely on the method for the above-mentioned calculation energy comparison that the present invention proposes, promptly utilize the characteristic of access burst sequence (that is, the difference with other burst sequence and noise signal), namely utilize the total 156 bits of access burst The characteristics of the middle 87 bits of the main energy concentration in the middle to distinguish whether the received signal is random access: set a comparison threshold m, if the following conditions are met:
那么，则认为接收信号是随机接入，这个m值可以通过理论和实验的方法共同获得，其取值范围在80％～95％之间。比如当设门限m为90％时，即能很好地从接收信号中区分出接入突发了。Then, the received signal is considered to be random access, and the value of m can be obtained through both theoretical and experimental methods, and its value range is between 80% and 95%. For example, when the threshold m is set to 90%, the access burst can be well distinguished from the received signal.
然后，利用训练序列的相关性来估算移动终端的初始距离，本发明给出估算距离的公式，该公式为：
例如，在GSM系统中，信息是分时传输的，每个时隙有156.25个比特，每时隙持续时间0.577ms，每比特持续时间3.69us。但此时基站并不知道移动终端与自己的距离，因而事先并不知道此上行序列在空中到底延迟了多长时间。此时基站将对所有可能的距离取值情况(也就是空中时延情况)做一遍搜索，以得到目前收到的此上行序列相比无空中时延时的情况到底错开了多少比特，进而才能通知移动终端下一帧数据提前多少比特时间发送。以此比特数可以估算出移动终端的初始距离，方法如下：For example, in the GSM system, information is transmitted in time division, each time slot has 156.25 bits, the duration of each time slot is 0.577ms, and the duration of each bit is 3.69us. But at this time, the base station does not know the distance between the mobile terminal and itself, so it does not know in advance how long the uplink sequence has been delayed in the air. At this time, the base station will perform a search on all possible distance values (that is, the air time delay) to obtain how many bits are staggered in the uplink sequence received so far compared with the case of no air time delay, and then can Inform the mobile terminal of how much bit time to send the next frame of data in advance. With this number of bits, the initial distance of the mobile terminal can be estimated, as follows:
假定时延比特数量为n，移动终端与基站之间的距离为d，考虑到时延是双向的，且电磁波以光速传播，代入以上计算公式，即为：Assuming that the number of delay bits is n, and the distance between the mobile terminal and the base station is d, considering that the delay is bidirectional and electromagnetic waves propagate at the speed of light, substituting the above calculation formula is:
GSM规定其通信距离为0~35公里，从以上计算得知，当距离d为35公里时，计算出延时为63.2比特，我们近似认为是63比特。也就是说，假如我们把0~63这可能的64种延时情况全部搜索一遍，那么我们一定可以搜寻到能正确解调出有用信息的位置。根据上面的计算公式，我们即可得知移动终端距离基站的初始距离；而此位置对应的这种延时正是我们所要寻找的初始时间提前量，基站将在随路控制信息里面将此信息下发给移动终端，通知移动终端下一帧提前相应的时间发送。GSM stipulates that its communication distance is 0~35 kilometers. From the above calculation, when the distance d is 35 kilometers, the calculated delay is 63.2 bits, which we approximately consider to be 63 bits. In other words, if we search all the possible 64 delay situations from 0 to 63, then we can definitely search for the position that can correctly demodulate useful information. According to the calculation formula above, we can know the initial distance between the mobile terminal and the base station; and the delay corresponding to this position is exactly the initial time advance we are looking for, and the base station will include this information in the road-associated control information Send it to the mobile terminal, and notify the mobile terminal to send the next frame ahead of time.
基站在下一次收到上行数据时，可用同样的计算方法计算出相应的时间偏移量，计算时间偏移量的方法是：计算本次基站接收序列的位置与基站基准序列位置间的比特偏移。此时间偏移量与上次时间提前量相加得到的结果就是基站下次将要通知移动终端的时间提前量。将时间偏移量代入下面的计算公式，我们就可以实时地计算出移动终端相对于基站的距离了。所述的移动终端的实时距离的计算公式是：移动终端的实时距离＝移动终端上一次与基站的距离+时间偏移量×单位时间偏移量对应的距离偏移。其中单位时间偏移量对应的距离偏移可利用前面的初始距离计算公式得到，由如下所式，时间偏移量对应的距离偏移为：When the base station receives uplink data next time, it can use the same calculation method to calculate the corresponding time offset. The method of calculating the time offset is: calculate the bit offset between the position of the sequence received by the base station and the position of the reference sequence of the base station . The result obtained by adding this time offset to the previous timing advance is the timing advance that the base station will notify the mobile terminal next time. Substituting the time offset into the following calculation formula, we can calculate the distance of the mobile terminal relative to the base station in real time. The formula for calculating the real-time distance of the mobile terminal is: real-time distance of the mobile terminal=last distance between the mobile terminal and the base station+time offset×distance offset corresponding to the unit time offset. The distance offset corresponding to the unit time offset can be obtained by using the previous initial distance calculation formula. According to the following formula, the distance offset corresponding to the time offset is:
本发明提供的这种方案是一种经过理论实践证明的行之有效的估算手段，这种估算既可以对某一个移动终端进行实时定位，也可测量某地区网络有效覆盖的范围，估计当地网络的质量，同时，还可对某个特定的移动用户位置进行跟踪，应用范围很广。The scheme provided by the present invention is an effective estimation method proved by theoretical practice. This estimation can not only locate a certain mobile terminal in real time, but also measure the effective coverage range of the network in a certain area, and estimate the local network At the same time, it can also track a specific mobile user location, and has a wide range of applications.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991168216A CN1162014C (en) | 1999-08-30 | 1999-08-30 | Method for Estimating the Distance of Mobile Terminals in Digital Mobile Communication System |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991168216A CN1162014C (en) | 1999-08-30 | 1999-08-30 | Method for Estimating the Distance of Mobile Terminals in Digital Mobile Communication System |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1286586A CN1286586A (en) | 2001-03-07 |
| CN1162014C true CN1162014C (en) | 2004-08-11 |
Family
ID=5279495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB991168216A Expired - Fee Related CN1162014C (en) | 1999-08-30 | 1999-08-30 | Method for Estimating the Distance of Mobile Terminals in Digital Mobile Communication System |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1162014C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7363044B2 (en) * | 2002-09-30 | 2008-04-22 | Motorola, Inc. | System and method for aiding a location determination in a positioning system |
| WO2013063789A1 (en) * | 2011-11-04 | 2013-05-10 | Beijing Weibang Yuanhang Wireless Technology Co., Ltd | Data communication methods and apparatus |
| CN102711273B (en) * | 2012-04-19 | 2015-02-04 | 北京创毅讯联科技股份有限公司 | Random access method in wireless network and user equipment |
-
1999
- 1999-08-30 CN CNB991168216A patent/CN1162014C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1286586A (en) | 2001-03-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1135893C (en) | Mobile station supervision of the forward dedicated control channel when in the discontinuous transmission mode | |
| CN1285182C (en) | Method for synchronizing a mobile station to UMTS when operating in GSM dedicated mode | |
| TW200509548A (en) | Block error rate estimate reporting for target signal to interference ratio adjustment | |
| CN1679253A (en) | Mobile communication system using location information | |
| CN1744750A (en) | Channel quality interpotation method | |
| CN1143589C (en) | Method and apparatus for estimating signal characteristics | |
| CN1162014C (en) | Method for Estimating the Distance of Mobile Terminals in Digital Mobile Communication System | |
| CN101499857B (en) | Differential decoding method for resisting Doppler based on Pattern time delay encoded underwater acoustic communication | |
| CN101034970B (en) | Valve value self-adaptive selection synchronization signal detection method and device | |
| WO2004051913A3 (en) | Excess delay spread detection method for multi-carrier communication systems | |
| CN1457152A (en) | Wireless communication device and wireless communication method | |
| KR101173943B1 (en) | Method for detecting random access signal | |
| CN1630997A (en) | A method and an apparatus for Eb/Nt estimation for forward power control in spread spectrum communications systems | |
| CN1856161A (en) | Locating method for user apparatus | |
| CN1190976C (en) | Dynamic time interval structure regulating method in channel estimation | |
| CN1124715C (en) | Multi-path search method and device of CDMA communication system | |
| KR100281653B1 (en) | Retransmission method of mobile communication system | |
| CN113630150B (en) | High-precision time synchronization method for communication system | |
| CN116319225A (en) | Lead mode identification method and device and electronic equipment | |
| CN1731888A (en) | Method of dynamic pilot detection threshold for random access of CDMA system | |
| CN1146278C (en) | Method for estimating interference level to idle channel in cellular mobile communication system | |
| CN1148905C (en) | Semi-blind Channel Estimation Method Against Deep Fading in Wideband Code Division Multiple Access | |
| CN120529404B (en) | A wireless ranging method and system based on programmable logic architecture | |
| CN1268082C (en) | Demodulation method and device for unipolar modulated signal | |
| CN1466298A (en) | A Method of Adaptive Power Control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C53 | Correction of patent for invention or patent application | ||
| CB02 | Change of applicant information |
Applicant after: Huawei Technologies Co., Ltd. Applicant before: Huawei Technology Co., Ltd., Shenzhen City |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: SHENZHEN HUAWEI TECHNOLOGY CO., LTD TO: HUAWEI TECHNOLOGY CO., LTD. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040811 Termination date: 20160830 |