CN101102147B - A time advance estimation method applicable to GSM/EDGE system - Google Patents

A time advance estimation method applicable to GSM/EDGE system Download PDF

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CN101102147B
CN101102147B CN 200710112358 CN200710112358A CN101102147B CN 101102147 B CN101102147 B CN 101102147B CN 200710112358 CN200710112358 CN 200710112358 CN 200710112358 A CN200710112358 A CN 200710112358A CN 101102147 B CN101102147 B CN 101102147B
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advance
gsm
energy
time
channel
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CN101102147A (en )
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刘涛
单淑伟
熊岗
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中兴通讯股份有限公司
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Abstract

The invention is concerned with the time advance prediction method for GSM/EDGE system. The method is to find the time advance precision quickly, according to the obtained time advance early volume that is obtained with the energy computing, comparing method within the channel. The method is simple and can be sued in all situations such as multi-pathway environment, voice or data operation, and to the final terminal situation and basic station system.

Description

一种适用于GSM/EDGE系统的时间提前量估计方法 Suitable for GSM / EDGE system timing advance estimation method

技术领域 FIELD

[0001] 本发明属于移动通讯领域,尤其涉及一种适用于GSM/EDGE系统的时间提前量(TA-TimingAdvance)估计方法。 [0001] The present invention belongs to the field of mobile communication, particularly to a suitable GSM / EDGE system timing advance (TA-TimingAdvance) estimation method.

背景技术 Background technique

[0002] GSM作为第二代移动蜂窝通信系统,在全世界范围内已经得到了广泛应用。 [0002] GSM as the second generation mobile cellular communication systems worldwide has been widely used. 但随着移动通信技术的迅速发展和承载业务的多样化,人们对数据业务的需求不断增加。 But with the rapid development of mobile communication technology diversification and bearer services, the demand for data services is increasing. 因此, 厂家们纷纷在开发新的、速率更快的移动数据通信技术,其中最典型的就是HCSD (高速率电路交换数据)和GPRS (通用分组无线服务)技术。 Accordingly, manufacturers who have in the development of new, faster rate of mobile data communication technology, which is the most typical HCSD (High Rate Circuit Switched Data) and GPRS (General Packet Radio Service) technology. HCSD的最高速率可达57. 6kbit/s。 HCSD the highest rate of up to 57. 6kbit / s. GPRS在核心网络首次引入了分级交换的方式,成为GSM向第三代网络演进的必经之路,可向用户提供最高速率为171kbit/s的链路,虽然HSCSD和GPRS在一定程度上提高了数据传输速率,但由于其仍然采用的是GMSK(高斯最小频移键控)的调制方式,因而它所提供的传输速率仍远远不能满足人们对通信系统越来越高的要求,因此有必要采用更为先进的通信和信号处理技术,以进一步扩大GSM系统的容量。 GPRS core network was first introduced in the way of grading exchange, becoming the evolution of GSM to third generation network the only way to provide the highest rate of 171kbit / s link to the user, although HSCSD and GPRS improved to a certain extent data transmission rate, but due to its still use the GMSK modulation (Gaussian minimum shift keying), and thus it provides the transmission rate still can not meet the people's growing demands communication system, it is necessary using more advanced communication and signal processing techniques, to further expand the capacity of the GSM system. 为了满足人们不断增长的对高速数据业务的需求和整个通信市场的需求,增强现有系统的竞争力,美国的TIA和欧洲电信标准化学会ETSI联合提出了一种基于TDMA的无线接入技术-EDGE (Enhanced Data Rates for GSM Revolution),以现有的GSM 频段提供高速的数据通信业务。 To meet the growing demand for high-speed data services demand and the overall communications market, enhance the competitiveness of the existing system, the United States TIA and ETSI European Telecommunications Standards Institute jointly proposed a TDMA-based wireless access technology of -EDGE (Enhanced data Rates for GSM Revolution), the existing GSM bands provide high-speed data communication service.

[0003] 为了在现有蜂窝系统中提供更高的数据通信速率,EDGE引入了多电平数字调制方式——8PSK调制。 [0003] In order to provide higher data rates in existing cellular communication systems, EDGE introduces multi-level digital modulation --8PSK modulation. 对于8PSK调制来说,每一调制符号可以映射为3个比特,从而与GMSK调制方式相比可以提供更高的比特率和频谱效率,而其实现复杂度却没有增大很多。 For 8PSK modulation, each modulation symbol may be mapped to 3 bits, as compared provide higher bit rates and spectral efficiency and GMSK modulation scheme, the complexity of its implementation has not increased much. GSM系统中使用的GMSK的调制方式也是EDGE调制方式的一部分。 GMSK modulation scheme used in GSM system is part of the EDGE modulation scheme. 两种调制方式的符号速率都是271kbit/s,每时隙的净比特率分别为22. 8kbit/s (GMSK)和69. 2kbit/s (8PSK)。 Symbol rate of the modulation methods is 271kbit / s, the net bit rate per slot were 22. 8kbit / s (GMSK) and 69. 2kbit / s (8PSK).

[0004] 无论对于原有的GSM系统还是新的EDGE系统,发射机所发送的信号都要经过多径信道的影响,因而为了克服多径环境引起的码间串扰,通常在接收端都需要一个信道均衡器。 [0004] No matter to the original GSM system or the new EDGE systems, the transmitted signal transmitters go through a multi-path channel, and thus to overcome the multipath environment due to inter-code crosstalk, usually required at the receiving end a channel equalizer. 按照GSM协议,在发端待发送的数据按照突发(Burst)进行发送,而在每一突发中间, 放置了一个长为26的训练序列。 According to the GSM protocol, the originating data to be transmitted are sent in the burst (Burst), and in the middle of each burst, the training sequence is placed in a length of 26. 为了保证均衡器的均衡性能,接收端一般要求得到极精确的训练序列的起始位置,即在接收端需要得到精确的时间提前量(TA)。 In order to guarantee the equalization performance of the equalizer, the receiver is generally required to give extremely accurate starting position of the training sequence, i.e., at the receiving end requires accurate timing advance (TA). 在传统方法中,接收端用已知的训练序列在各个符号位置与接收到的突发进行相关,而具有最大相关值对应的符号位置即为估计的TA。 In the conventional method, a receiving end in a known training sequence associated with the received bursts at respective symbol position having the largest correlation value is the symbol position corresponding to the estimated TA. 可是在实际系统中,这一方法受到多径环境的影响很大,从而导致TA计算的不准确,进而影响系统的均衡结果。 But in practical systems, this approach is very much affected multipath environment, resulting in an inaccurate calculation of TA, thereby affecting the equilibrium of the system.

[0005]在专利号为 US6724837 的美国专利“Timing Estimation for GSM Bursts Basedon Past History”中,采用的方法是对于先接收到的N个突发,令训练序列分别与它们进行相关运算;然后通过寻找得到的相关序列的最大值分别得到这N个突发各自的TA, 并对得到的这N个TA求平均;最后,在所求得的TA平均值的基础上,估计后续M个突发的各自TA。 [0005] In U.S. Patent No. US6724837 a "Timing Estimation for GSM Bursts Basedon Past History", the method used for the first received burst of N, so that the training sequences and correlation calculation thereof; followed by looking maximum of the correlation sequence obtained respectively in each of the N bursts TA, and the TA obtained averaging the N; Finally, on the basis of the determined mean value TA, the subsequent estimates of the M bursts each TA. 在这个专利中,为了保证得到的后续M个突发时间提前量的准确性,就要求用于计算初始化TA的突发的数目N值尽可能大,可是这一专利并没有保证用于计算初始化TA值的N个突发的TA的准确性,因而如果N值过大,由于预先接收到的N个突发的性能无法得到保证,因而接收机的整体性能无法得到保证。 In this patent, in order to ensure the subsequent burst of M timing advance accuracy obtained, it requires initialization for calculating the number N of bursts TA value as large as possible, but this patent does not guarantee the initialization for calculating the accuracy of the N bursts TA TA value, so if N is too large, since the N previously received burst performance can not be guaranteed, and therefore the overall performance of the receiver can not be guaranteed. 另一方面,这一专利要求对连续收到的突发的TA取平均值,对于基于电路交换的语音业务,这一方法是可行的;但是对于基于分组交换的数据业务来说,由于前后收到的相邻2个突发的数据未必都来自同一个发射机,因而对基于分组交换的业务来说,这一专利是无法应用的,尤其对于具有EDGE功能的GSM系统, 这一方法更是失去了实际意义。 On the other hand, this patent requires continuous burst of the received TA averaged for circuit-switched voice services, this approach is feasible; but for packet switched data services based on it, to close the front and rear adjacent to the two data bursts are not necessarily all from the same transmitter, and thus the packet switched service is based on this patent can not be applied, in particular with respect to GSM EDGE system function, this method is It lost its practical significance.

[0006]在专利号为 US6859491 对应的欧洲专利“Iterative Estimation of Timing in GSMBursts”中,提出了一种迭代估计时间提前量并进行数据均衡的方法。 [0006] In European Patent US6859491 Patent No. corresponding to "Iterative Estimation of Timing in GSMBursts", there is proposed an iterative estimation time advance data and equalization method. 对于每一个接收到的突发,这一专利首先假设TA有一个初始值,然后在每一次循环中都令TA加1,直到循环到某一次数N ;而在每次循环中,都根据给定的TA对接收数据进行均衡解调;在此基础上, 令已知的训练序列与均衡结果中对应位置上的序列进行相关并记录相关值;最后,在得到的相关值序列中具有最大相关值所对应的TA值就是真正要求的值。 For each received burst, this patent there is first assumed that an initial value TA, and then each cycle TA are added in the order 1, to a certain number of times until the loop N; in each cycle, according to both TA given equalized reception data demodulation; on this basis, so with the known training sequence equilibrium position corresponding to the sequence correlating and recording correlation values; finally, having the maximum correlation value in the correlation sequence obtained corresponding to the value TA value is the value of the real requirements. 这一专利与上面的专利相比,克服了上面专利的缺点,它不但可以用于基于电路交换的语音业务,而且可以用于基于分组交换的数据业务。 This patent compared to the above patents, patent overcomes the above disadvantages, it not only can be used for circuit switched voice services based on, but also for packet switched based data services. 可是这一专利在求TA时要对接收信号进行N次解调,如果N太大,则计算过于复杂,因而很难应用于实际系统中。 This patent, however when evaluated for TA to demodulate the received signal N times, if N is too large, then the calculation is more complicated and thus difficult to apply to practical systems.

[0007] 以上专利所揭示技术方案的缺点是对现行的GSM/EDGE系统不太适用,不是计算复杂度过高,就是应用困难,因而有必要找到一种更实际、更灵活的寻找时间提前量的方法。 [0007] disadvantage of the above patent disclosed technical solution is the existing GSM / EDGE system is not applicable, not computational complexity is too high, is difficult to apply, it is necessary to find a more practical and flexible to find time advance Methods.

发明内容 SUMMARY

[0008] 本发明所要解决的技术问题是提供一种更实际、更快速的寻找时间提前量的方法。 [0008] The present invention solves the technical problem of providing a more practical, faster seek time advance method.

[0009] 为解决上述技术问题,本发明提供一种适用于GSM/EDGE系统的时间提前量估计方法,包括: [0009] To solve the above problems, the present invention provides a suitable GSM / EDGE system timing advance estimation method, comprising:

[0010] a)依据接收到的突发的调制方式的不同进行符号反旋转; [0010] a) based on burst modulation scheme of the received symbols for different counter-rotating;

[0011] b)利用反旋转后的数据估计信道参数序列; Data [0011] b) by reverse rotation of the estimated channel parameter sequence;

[0012] c)计算预先设定长度的信道估值能量的均值; [0012] c) calculating a predetermined length of the channel estimate of the mean energy;

[0013] d)寻找能量大于平均能量的径的位置,记为Ltl〜Ln ; [0013] d) find the location of energy greater than the average energy of the path, denoted Ltl~Ln;

[0014] e)判断Ln-Lci是否小于K1XM且Ltl > K2XM,是则设置时间提前量的初始值为L0-K2XM ;不是则设置时间提前量的初始值为Ltl ; [0014] e) determining whether Ln-Lci and less than K1XM Ltl> K2XM, the timing advance is initially set value L0-K2XM; not set the initial value of the timing advance Ltl;

[0015] 其中,M为采样倍数,Kl为信道的弥散长度,K2为一个预先设定的门限; [0015] wherein, M being a multiple of the sampling, Kl dispersion length of the channel, K2 is a predetermined threshold;

[0016] f)以上述设置的时间提前量的初始值为起点,计算每一倍采样连续1^根径的能量和;寻找M个能量和中最大能量对应的采样点m ;获得精确的时间提前量值为前述设置时间提前量的初始值加m。 [0016] f) In advance of the above setting of the starting point of the initial value, calculated for each sample twice energy continuous ^ 1 and root diameter; Looking for the M maximum energy and the energy corresponding to m sampling points; accurate time is obtained the advance value is set an initial value of the timing advance plus m.

[0017] 根据本发明所述方法,以比较快的速度寻找到时间提前量的初始值,根据获得的时间提前量的初始值能快速找到时间提前量的精确值,该方法计算复杂度较小且在各种情况(系统处于静态或多径环境,用于语音业务或数据业务,对于终端系统还是基站系统)下均适用。 [0017] The method according to the invention, a relatively fast time to find the initial value of the amount of the advance, the timing advance can quickly find the precise value depending on the time of obtaining the initial value of the advance, the method calculates less complex and, in each case (in a static system or multipath environments, for voice traffic or data traffic, or a base station system for the terminal system) under apply.

[0018] 附图说明[0019] 图1给出了GSM/EDGE系统收发信机的基本示意图。 [0018] BRIEF DESCRIPTION [0019] Figure 1 shows a schematic view of the basic GSM / EDGE transceiver system.

[0020] 图2是GSM/EDGE系统中常规突发脉冲的数据格式。 [0020] FIG. 2 is a data format of GSM / EDGE burst in a conventional system.

[0021] 图3是时间提前量估计流程图。 [0021] FIG. 3 is a flowchart of a timing advance estimation.

[0022] 图4是NB单倍采样信道估值能量示意图。 [0022] FIG. 4 is a single-NB sampled channel estimate energy FIG.

[0023] 具体实施方式 [0023] DETAILED DESCRIPTION

[0024] 下面结合附图对技术方案的实施作进一步的详细描述。 [0024] The following describes embodiments of the technical solutions described in further detail in conjunction. 对于熟悉本技术领域的人员而言,从对本发明方法的描述中,本发明的上述和其他目的、特征和优点将显而易见。 For the person skilled in the art from the description of the method of the present invention, the above and other objects, features and advantages of the present invention will be apparent.

[0025] 参照图1,在发射端,信源编码模块101输出的数据送入信道编码交织模块102后经过基带GMSK/8PSK调制模块103、上变频模块104和发射天线105后送入无线信道;在接收端,接收天线106收到的信号经下变频模块107分别送入信号解调模块109与时间提前量及信道参数估计模块108,模块108估计出信道参数与时间提前量后也送入信号解调模块109,然后信号解调模块109根据收到的信息对接收信号进行解调,解调结果送入解交织与解码模块110,并最终经信源解码模块111输出。 [0025] Referring to FIG. 1, at the transmitting end, the data output from the source coding block 101 into channel coding interleaving module 102 through the baseband GMSK / 8PSK modulation module 103, the conversion module 104 and a transmit antenna into a wireless channel 105; at the receiving end, the receiving antenna 106 receives the signal conversion module 107, respectively, into the demodulation module 109 and the advance time and channel parameter estimation module 108, the module 108 into the signal estimated channel parameters and a time advance a demodulation module 109, then the signal demodulation module 109 according to the received information on the demodulated received signal, deinterleaves the demodulation result into the decoding module 110, and finally outputs the source decoder 111 module.

[0026] 图2是GSM/EDGE系统中常规突发脉冲的数据格式。 [0026] FIG. 2 is a data format of GSM / EDGE burst in a conventional system. 对于常规突发脉冲NB (Normal Burst)来说,其信息数据分成两组各58个符号,其中57位为数据,另一位为偷帧比特表示此数据是用户数据还是信令。 With conventional burst NB (Normal Burst) for which the information data is divided into two groups of 58 symbols, 57 data bits, another of stealing bit frames indicates user data or signaling data. 在这两段数据之间插入了26位的训练序列,其中26bit的开头和结尾各5bit为保护间隔,中间的16bit数据用来估计信道参数和时间提前量。 In between these two 26-bit data into a training sequence, wherein each of the beginning and the end of the guard interval 5bit 26bit, 16bit intermediate data used to estimate the channel parameters and timing advance. 3个尾比特“0”加于有用信息段的两侧。 Three tail bits "0" is applied to both sides of useful pieces of information. NB数据的最后为8. 25bit的时间,不发任何信号,作为相邻时隙的保护段。 8. 25bit for the last time, do not send any data signal NB, adjacent time slots as protection stages.

[0027] 参照图3,本发明的时间提前量的估计按下列步骤进行: [0027] Referring to FIG. 3, the amount of time in advance of the present invention estimates the following steps:

[0028] 步骤301,接收端106、107模块接收突发并送入时间提前量及信道参数估计模块108。 [0028] Step 301, the receiver module receives a burst 106, 107 and into the advance time and channel parameter estimation module 108.

[0029] 步骤302,依据接收到的突发的调制方式的不同分别按照GMSK或者8PSK进行符号 [0029] Step 302, based on burst modulation scheme of the received symbols according to respectively different GMSK or 8PSK

反旋转。 Anti rotation.

[0030] 步骤303,利用反旋转后的数据估计信道参数序列。 [0030] Step 303, the estimated channel parameters using the data sequence after the reverse rotation.

[0031] 步骤304,计算一定长度的信道估值能量的均值,这个长度取值范围为22〜24 ;对于NB和接入脉冲AB (Access Burst)由于搜索的长度不同,计算能量均值的长度不同。 [0031] Step 304, calculating a length of channel estimate of the mean energy, this length in the range of 22~24; and NB for the access burst AB (Access Burst) due to the different length of the search, the calculation of the mean energy of different lengths .

[0032] 步骤305,寻找能量大于平均能量的径的位置,记为Ltl〜Ln。 [0032] Step 305, to find the position of energy greater than the average energy of the path, denoted Ltl~Ln.

[0033] 步骤306,判断Ln-Lci是否小于K1XM且Ltl > K2 XM,若是则转步骤308,其中M为采样倍数,K1为信道的弥散长度,K2为一个取定的门限,取值范围为1〜3 ;如果不是则进入步骤307。 [0033] Step 306, it is determined Ln-Lci is smaller than K1XM and Ltl> K2 XM, if yes go to step 308, where M is the sampling times, Kl is the dispersion length channel, K2 is a take predetermined threshold, the range ~ 3; if not proceeds to step 307.

[0034] 步骤307,设置TA初始值为L。 [0034] Step 307, the initial value TA set L. .

[0035] 步骤308,设置TA初始值为Ltl-K2 XM。 [0035] Step 308, the initial value TA set Ltl-K2 XM.

[0036] 步骤309,以TA初始值为起点,计算每一倍采样连续K1根径的能量和。 [0036] Step 309, the initial value TA to the starting point, the energy calculated for each sample twice continuously K1 and root diameter.

[0037] 步骤310,寻找M个能量和中最大能量对应的采样点m [0037] Step 310, m M number of sampling points to find the energy corresponding to the maximum energy and

[0038] 步骤311,输出精确的TA值为TA初始值加m。 [0038] Step 311, the output value is accurate TA TA initial value plus m.

[0039] 步骤312,利用该精确的TA值进行后续的信号解调。 [0039] Step 312, by using the accurate TA value for subsequent demodulation.

[0040] 图4是单倍采样的NB的信道估值能量示意图,图中横实线表示的是平均能量。 [0040] FIG. 4 is a single-channel sample estimate of energy NB schematic drawing horizontal solid line indicates the average energy. 利用本发明的方法来进行TA估计,则Ltl = 3,Ln= 12,在1(2= 1时最后得到的TA精确值为2。 Using the method of the present invention is to estimate the TA, the Ltl = 3, Ln = 12, at 1:01 (the last 2 = 2 is obtained accurate TA.

[0041] 本发明针的时间提前量估计方法首先通过简单的计算信道估值能量的均值的方法得到TA的初始值,然后在所得初始TA值的基础上,在采样点中进一步得到精确的TA估计。 [0041] time the needle of the present invention advance estimation method first method estimates the mean energy by a simple calculation the channel to obtain an initial value TA, and then based on the obtained initial TA value, the more accurate sampling points TA estimate. 这一方法与已有方法相比,无论接收系统处于静态还是多径环境,无论是用于语音业务还是数据业务,都能以低的计算复杂度完成较高精度的时间提前量估计。 This method compared with existing methods, whether static or receiving system in a multipath environment, whether for voice or data services, can be a low computational complexity completed high precision timing advance estimate.

[0042] 前面提供了对较佳实施例的描述,以使本领域内的任何技术人员可使用或利用本发明。 [0042] The previous description of the preferred embodiments, to enable any person skilled in the art or may be used with the present invention. 对这些实施例的各种修改对本领域内的技术人员是显而易见的,可把这里所述的总的原理应用到各其他实施例而不使用创造性。 Various modifications to these embodiments skilled in the art will be apparent, the general principles herein may be applied to each of the other embodiments without the use of the inventive. 因而,本发明将不限于这里所示的实施例,而应依据符合这里所揭示的原理和新特征的最宽范围。 Accordingly, the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope according to the principles disclosed herein and new features.

6 6

Claims (4)

  1. 一种适用于GSM/EDGE系统的时间提前量估计方法,其特征在于,包括:A、依据接收到的突发的调制方式的不同进行符号反旋转;B、利用反旋转后的数据估计信道参数序列;C、计算预先设定长度的信道估值能量的均值;D、寻找能量大于平均能量的径的位置,记为L0~LN;E、判断LN‑L0是否小于K1×M且L0>K2×M,是则设置时间提前量的初始值为L0‑K2×M;不是则设置时间提前量的初始值为L0;其中,M为采样倍数,K1为信道的弥散长度,K2为一个预先设定的门限;F、以上述设置的时间提前量的初始值为起点,计算每一倍采样连续K1根径的能量和;寻找M个能量和中最大能量对应的采样点m;获得精确的时间提前量值为前述设置时间提前量的初始值加m。 Suitable for GSM / EDGE system timing advance estimation method, comprising: A, burst modulation scheme based on received symbols for different counter-rotating; B, using the data to estimate the channel parameters of counter-rotating sequence; C, the channel length set in advance calculated estimate of the mean energy; D, find the location of energy greater than the average diameter of the energy, referred to as L0 ~ LN; E, determining whether LN-L0 is less than K1 × M and L0> K2 × M, a timing advance is set initial value L0-K2 × M; advance time is set is not the initial value of the L0; wherein, M being a multiple of the sampling, K1 is the length of the channel dispersion, K2 is a preset predetermined threshold; F, in order to advance the time of the set initial value of the starting point, the energy calculated for each sample twice K1 and successive root diameter; Looking for the m and the energy corresponding to the maximum energy sampling point m; accurate time is obtained the advance value is set an initial value of the timing advance plus m.
  2. 2.如权利要求1所述的适用于GSM/EDGE系统的时间提前量估计方法,其特征在于:所述步骤C中信道长度的取值范围为22〜24。 2. The time suitable for GSM / EDGE system according to claim 1 advance estimation method, characterized in that: said step C in the range of 22~24 length of the channel.
  3. 3.如权利要求1所述的适用于GSM/EDGE系统的时间提前量估计方法,其特征在于:所述门限K2的取值范围为1〜3。 Time suitable for GSM / EDGE system according to claim 1 advance estimation method, characterized in that: said threshold K2 is in the range of 1~3.
  4. 4.如权利要求1所述的适用于GSM/EDGE系统的时间提前量估计方法,其特征在于:所述步骤C中信道长度对常规突发脉冲和接入脉冲分别取不同的长度。 Time suitable for GSM / EDGE system as claimed in claim 1 in claim advance estimation method, characterized in that: said step C, the channel length of the conventional pulse burst and the access different lengths were taken. 2 2
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Citations (3)

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US5711003A (en) 1993-05-14 1998-01-20 Alcatel Mobile Communication France Method for determining timing advance during handover
EP0996237A1 (en) 1998-10-19 2000-04-26 Lucent Technologies Inc. Timing estimation for GMS bursts based on previously determined average values
CN1913421A (en) 2005-08-08 2007-02-14 中兴通讯股份有限公司 Time lead estimating method suitable for GSM/EDGE system

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US5711003A (en) 1993-05-14 1998-01-20 Alcatel Mobile Communication France Method for determining timing advance during handover
EP0996237A1 (en) 1998-10-19 2000-04-26 Lucent Technologies Inc. Timing estimation for GMS bursts based on previously determined average values
CN1913421A (en) 2005-08-08 2007-02-14 中兴通讯股份有限公司 Time lead estimating method suitable for GSM/EDGE system

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