CN100399847C - Method for measuring adjacent cell - Google Patents

Abstract

Translated fromChinese

本发明公开了一种邻小区测量方法，用于用户终端UE进行邻小区测量，包括：UE获得各个邻小区的下行导频时隙DwPTS的位置及功率信息；UE分别根据各个邻小区的DwPTS位置信息，确定各个邻小区的TS0时隙的位置；UE从各个邻小区的TS0时隙中获得主公共控制物理信道的训练序列PCCPCHMidamble，并将之与预先获得的各个邻小区的基本训练序列Midamble进行信道冲击响应估计，得到各个邻小区的信道冲击响应；根据各个邻小区的信道冲击响应分别计算各个邻小区的主公共控制物理信道的接收信号编码功率PCCPCH RSCP和系统帧号间观测时间差SFN_SFN OTD。并且，本方法还包括：判断各个邻小区的DwPTS是否有效。上述邻小区测量方法不仅测量范围大，而且测量准确性高。

The invention discloses a neighboring cell measurement method, which is used for a user terminal UE to measure neighboring cells, including: the UE obtains the position and power information of the downlink pilot time slot DwPTS of each neighboring cell; information, to determine the position of the TS0 time slot of each neighboring cell; UE obtains the training sequence PCCPCHMidamble of the primary common control physical channel from the TS0 time slot of each neighboring cell, and performs it with the pre-acquired basic training sequence Midamble of each neighboring cell The channel impulse response is estimated to obtain the channel impulse response of each adjacent cell; according to the channel impulse response of each adjacent cell, the received signal coding power PCCPCH RSCP and the observation time difference between system frame numbers SFN_SFN OTD of the main common control physical channel of each adjacent cell are respectively calculated. Moreover, the method further includes: judging whether the DwPTS of each neighboring cell is valid. The above neighbor cell measurement method not only has a large measurement range, but also has high measurement accuracy.

Description

Translated fromChinese

邻小区测量方法Neighboring cell measurement method

技术领域technical field

本发明涉及无线通信领域，尤其涉及一种邻小区测量方法，特别是适用TD-SCDMA通信系统的邻小区测量方法。The invention relates to the field of wireless communication, in particular to a method for measuring an adjacent cell, in particular to a method for measuring an adjacent cell applicable to a TD-SCDMA communication system.

背景技术Background technique

TD-SCDMA通信系统，UE(用户终端)在小区初搜时，主要是尽快找到一个可用小区进行通信，但所述小区并不一定是通信质量最佳小区，因此当UE处于空闲状态时，需要进行邻小区测量，以便能找到更佳通信质量的服务小区。In the TD-SCDMA communication system, when the UE (user terminal) initially searches for a cell, it mainly finds an available cell for communication as soon as possible, but the cell is not necessarily the cell with the best communication quality, so when the UE is in an idle state, it needs to Neighboring cell measurements are performed to find serving cells with better communication quality.

另外，UE在移动过程中，本UE所处的区域可能发生改变，由此使得该UE从一个小区的覆盖范围到了另一个小区的覆盖范围，因此UE也需要进行邻小区测量，以便能找到更好通信质量的服务小区。In addition, during the moving process of the UE, the area where the UE is located may change, thus causing the UE to change from the coverage of one cell to the coverage of another cell. Therefore, the UE also needs to measure neighboring cells in order to find a better location. A service cell with good communication quality.

所述邻小区测量主要是为了获得邻小区的PCCPCH RSCP(主公共控制物理信道接收信号编码功率)和SFN_SFN OTD(系统帧号间观测时间差)，以便UE的物理层上报至高层，进而使得高层进行小区重选(非CELL_DCH状态下)或者切换(CELL_DCH状态下)，使得UE能够驻留在更好的服务小区中。所述PCCPCH RSCP是用于选择比现有服务小区更好的服务小区，所述SFN_SFNOTD用于切换和UE定位。The adjacent cell measurement is mainly to obtain the PCCPCH RSCP (primary common control physical channel received signal coding power) and SFN_SFN OTD (observation time difference between system frame numbers) of the adjacent cell, so that the physical layer of the UE can be reported to the upper layer, and then the upper layer can be carried out. Cell reselection (in non-CELL_DCH state) or handover (in CELL_DCH state), so that the UE can camp on a better serving cell. The PCCPCH RSCP is used to select a better serving cell than the existing serving cell, and the SFN_SFNOTD is used for handover and UE positioning.

现有的邻小区测量主要是通过使用接收的DwPTS(下行导频时隙)数据或者使用TS0PCCPCH(主公共控制物理信道)的中间训练序列(Midamble)完成，进而得到需要测量的邻小区的PCCPCH RSCP功率值和各个邻小区与服务小区的SFN_SFN OTD。The existing adjacent cell measurement is mainly completed by using the received DwPTS (downlink pilot time slot) data or the intermediate training sequence (Midamble) of the TS0 PCCPCH (primary common control physical channel), and then obtains the PCCPCH RSCP of the adjacent cell to be measured Power value and SFN_SFN OTD of each neighboring cell and serving cell.

请参阅图1，其为现有技术中邻小区测量第一种方法的流程图。它主要是利用DwPTS进行邻小区测量，包括以下步骤：Please refer to FIG. 1 , which is a flow chart of the first method for neighbor cell measurement in the prior art. It mainly uses DwPTS to measure adjacent cells, including the following steps:

首先进行步骤S110，当UE与服务小区进行上下行时隙同步后，UE能定期接收服务小区下发的BCH(广播)消息，由此获得每个邻小区的SYNC-DL。First proceed to step S110. After the UE synchronizes uplink and downlink time slots with the serving cell, the UE can periodically receive BCH (broadcast) messages sent by the serving cell, thereby obtaining SYNC-DL of each neighboring cell.

BCH包括服务小区的每个邻小区信息，每个邻小区信息中包含邻小区的小区ID信息，即邻小区的基本Midamble(中间训练序列)。而一个SYNC-DL(下行导频码)和一个扰码组相互对应，每个扰码组包含4个特定的扰码，每个扰码对应一个基本Midamble，因此UE根据基本Midamble就能获得该邻小区的SYNC-DL。The BCH includes the information of each neighboring cell of the serving cell, and each neighboring cell information includes the cell ID information of the neighboring cell, that is, the basic Midamble (middle training sequence) of the neighboring cell. A SYNC-DL (downlink pilot code) corresponds to a scrambling code group. Each scrambling code group contains 4 specific scrambling codes. Each scrambling code corresponds to a basic Midamble. Therefore, the UE can obtain the basic Midamble according to the basic Midamble. SYNC-DL of neighboring cells.

然后进行步骤S120：将各个邻小区的SYNC_DL与UE接收到的DwPTS数据部分进行复相关，获得每个邻小区的峰值和峰值位置点分别做为本邻小区下发的DwPCH的功率及邻小区DwPTS的位置。Then proceed to step S120: perform complex correlation between the SYNC_DL of each neighboring cell and the DwPTS data received by the UE, and obtain the peak value and peak position point of each neighboring cell as the power of the DwPCH delivered by the neighboring cell and the DwPTS of the neighboring cell s position.

各个小区(包括邻小区和服务小区)的DwPTS都是按照正常时序发送的，由于各个小区之间是处于同步状态，又由于各个小区和UE相隔距离不同，因此各个小区的DwPTS到达UE的时间点存在一定的偏差，进而导致UE在同一个时间点收到的是各个小区发送的混迭在一起的DwPTS数据。The DwPTS of each cell (including neighboring cells and serving cells) is sent according to the normal timing. Since each cell is in a synchronized state, and because the distance between each cell and the UE is different, the time when the DwPTS of each cell arrives at the UE There is a certain deviation, which leads to the fact that what the UE receives at the same time point is the aliased DwPTS data sent by various cells.

UE将预先获得的每个邻小区的SYNC_DL码与上述的DwPTS数据进行复相关，得到不同的相关值。比如采用移位复相关的方法进行每一个邻小区的SYNC_DL码与UE接收到的DwPTS数据的复相关，不同的移位得到不同的相关结果，因此每个邻小区都能得到多个相关功率值，找到的峰值功率值即为所述邻小区下发的DwPCH的功率，而所述峰值对应的移位即为所述邻小区DwPTS的位置。The UE performs complex correlation between the pre-acquired SYNC_DL code of each neighboring cell and the above DwPTS data to obtain different correlation values. For example, the shifted complex correlation method is used to carry out the complex correlation between the SYNC_DL code of each neighboring cell and the DwPTS data received by the UE. Different shifts can obtain different correlation results, so each neighboring cell can obtain multiple correlation power values. , the found peak power value is the power of the DwPCH delivered by the neighboring cell, and the shift corresponding to the peak value is the position of the DwPTS of the neighboring cell.

随后进行步骤S130：计算每个邻小区下发的DwPCH的功率和PCCPCH的功率之间的功率差，推知每个邻小区的PCCPCH RSCP。其中，PCCPCH的功率是由服务小区预先下发至UE的。Then proceed to step S130: calculate the power difference between the power of DwPCH delivered by each neighboring cell and the power of PCCPCH, and deduce the PCCPCH RSCP of each neighboring cell. Wherein, the power of the PCCPCH is delivered to the UE in advance by the serving cell.

最后进行步骤S140，计算每个邻小区DwPTS的位置S与本服务小区的DwPTS位置S的差值，获得OTD。Finally, step S140 is performed to calculate the difference between the DwPTS position S of each neighboring cell and the DwPTS position S of the serving cell to obtain the OTD.

请参阅图2，其为TD-SCDMA子帧结构示意图。每一子帧包括7个常规时隙和3个特征时隙。3个特征时隙分别为DwPTS、GP(主保护时隙)、UpPTS(上行导频时隙)。各个小区的DwPTS都按照正常时序发送。由于各个小区之间是同步的，在UE端的同一个时间点收到的是同一个频率的各个小区发送的混迭在一起的DwPTS数据(但因为各个小区至UE的距离不同，各个小区下发的DwPTS数据到达UE的时间点可能存在一定的偏差)。为了接收到离UE远的小区发送的DwPTS数据，则UE需要在GP时隙继续接收数据，才能保证接收到所有小区的DwPTS数据。而当UE需要占用GP提前发送UpPTS数据至服务小区时，就会发生收发冲突。若UE占用GP提前发送UpPTS数据至服务小区时，则就导致UE无法收集完所有邻小区的DwPTS数据，进而导致测量结果不准确的后果。Please refer to FIG. 2 , which is a schematic diagram of a TD-SCDMA subframe structure. Each subframe includes 7 regular slots and 3 feature slots. The three characteristic time slots are DwPTS, GP (Primary Guard Time Slot), and UpPTS (Uplink Pilot Time Slot). The DwPTS of each cell is sent according to the normal timing. Since each cell is synchronized, what is received at the same time point on the UE side is the mixed DwPTS data sent by each cell of the same frequency (but because the distance from each cell to the UE is different, each cell sends There may be a certain deviation in the time point when the DwPTS data arrives at the UE). In order to receive DwPTS data sent by cells far away from the UE, the UE needs to continue receiving data in GP time slots to ensure that it can receive DwPTS data from all cells. However, when the UE needs to use the GP to send UpPTS data to the serving cell in advance, conflicts between sending and receiving will occur. If the UE uses the GP to send the UpPTS data to the serving cell in advance, the UE cannot collect the DwPTS data of all neighboring cells, resulting in inaccurate measurement results.

为此，本领域的技术人员又提出了一种测量准确较高的第二种邻小区测量方法。请参阅图3，其为现有技术邻小区测量的第二种方法的流程图。它主要是使用TS0Midamble部分进行邻小区测量，包括以下步骤：For this reason, those skilled in the art have proposed a second neighbor cell measurement method with higher measurement accuracy. Please refer to FIG. 3 , which is a flow chart of the second method of neighbor cell measurement in the prior art. It mainly uses the TS0Midamble part to measure neighboring cells, including the following steps:

首先进行步骤S210：当UE与服务小区进行同步后，UE能定期接收服务小区下发的BCH(广播)消息，获得每个邻小区的基本Midamble。First proceed to step S210: after the UE is synchronized with the serving cell, the UE can periodically receive BCH (broadcast) messages sent by the serving cell, and obtain the basic Midamble of each neighboring cell.

BCH包括服务小区的每个邻小区信息，每个邻小区信息中包含邻小区的小区ID信息，即邻小区的基本Midamble。The BCH includes the information of each neighboring cell of the serving cell, and each neighboring cell information includes the cell ID information of the neighboring cell, that is, the basic Midamble of the neighboring cell.

随后进行步骤S220：UE将接收到的TS0Midamble数据部分分别与各个邻小区的基本Midamble求信道响应。Then proceed to step S220: the UE calculates the channel response from the received TSOMidamble data part with the basic Midamble of each neighboring cell.

各个小区(包括邻小区和服务小区)的TS0Midamble都是按照正常时序发送的，由于各个小区之间是同步的，又由于各个邻小区和UE相隔距离不同，因此各个小区的TS0时隙到达UE的时间点存在一定的偏差，进而导致UE在同一个时间点收到的是各个小区发送的混迭在一起的TS0数据，根据TS0数据与各个邻小区的基本Midamble求信道冲击响应估计，获得信道冲击响应。The TSO Midamble of each cell (including neighboring cells and serving cells) is sent in normal timing. Since each cell is synchronized and the distance between each neighboring cell and the UE is different, the TS0 time slot of each cell reaches the UE. There is a certain deviation in the time point, which causes the UE to receive the mixed TS0 data sent by each cell at the same time point. According to the TS0 data and the basic Midamble of each neighboring cell, the channel impulse response is estimated to obtain the channel impact response.

随后进行步骤S230：为了提高测量的准确性，利用某一去噪算法对每个邻小区的信道冲击响应进行去噪处理。Then proceed to step S230: in order to improve the measurement accuracy, use a denoising algorithm to denoise the channel impulse response of each neighboring cell.

随后进行步骤S240：利用去噪后的信道冲击响应求每个邻小区接收信号码功率PCCPCH RSCP；Carry out step S240 subsequently: Utilize the channel impulse response after denoising to ask each adjacent cell received signal code power PCCPCH RSCP;

最后进行步骤S250，利用内插函数对每个邻小区的信道响应进行1/8CHIP内插，找到信道冲击响应的峰值位置，每个邻小区和本小区的峰值位置差表示该邻小区和本小区的定时差SFN_SFN OTD。Finally, step S250 is performed, using the interpolation function to perform 1/8 CHIP interpolation on the channel response of each neighboring cell to find the peak position of the channel impulse response, and the peak position difference between each neighboring cell and this cell represents the neighboring cell and this cell The timing difference of SFN_SFN OTD.

上述方法是根据Midamble计算信道冲击响应的，通常服务小区的信道冲击响应都会落在一个范围内，比如16个抽头之内，这个范围称之为信道估计窗。在服务小区和UE进行同步操作时，一定会保证服务小区的信道冲击响应落在该信道估计窗的范围之内。由于无法获知各个邻小区的初同步信息，因此UE通常以与服务小区计算信道冲击响应的信道估计窗做为与邻小区计算信道冲击响应的信道估计窗。但是，若邻小区与服务小区的定时相差较大，该邻小区的信道冲击响应极有可能就不会落在这个信道估计窗内，由此UE是不会得到该邻小区的信道响应，进而使得测量范围受限。The above method calculates the channel impulse response based on Midamble. Usually, the channel impulse response of the serving cell falls within a range, for example, within 16 taps. This range is called the channel estimation window. When the serving cell and the UE perform synchronous operations, it must be ensured that the channel impulse response of the serving cell falls within the range of the channel estimation window. Since the initial synchronization information of each neighboring cell cannot be obtained, the UE usually uses the channel estimation window for calculating the channel impulse response with the serving cell as the channel estimation window for calculating the channel impulse response with the neighboring cell. However, if the timing difference between the adjacent cell and the serving cell is large, the channel impulse response of the adjacent cell may not fall within the channel estimation window, so the UE will not obtain the channel response of the adjacent cell, and further This limits the measurement range.

发明内容Contents of the invention

本发明的目的在于提供一种适用于TD-SCDMA的邻小区测量方法，以解决现有技术中测量范围受限且测量准确性不高的技术缺陷。The purpose of the present invention is to provide a method for measuring adjacent cells suitable for TD-SCDMA, so as to solve the technical defects of limited measurement range and low measurement accuracy in the prior art.

为解决上述问题，本发明公开了一种邻小区测量方法，用于用户终端UE进行邻小区测量，包括：A、UE获得各个邻小区的下行导频时隙DwPTS的位置及功率信息；B、UE分别根据各个邻小区的DwPTS位置信息，确定各个邻小区的TS0时隙的位置；C、UE从各个邻小区的TS0时隙中获得主公共控制物理信道的训练序列PCCPCH Midamble，并将之与预先获得的各个邻小区的基本In order to solve the above problems, the present invention discloses a method for measuring neighboring cells, which is used for user terminal UE to measure neighboring cells, including: A. UE obtains the position and power information of the downlink pilot time slot DwPTS of each neighboring cell; B. The UE determines the position of the TS0 time slot of each neighboring cell according to the DwPTS position information of each neighboring cell; C. The UE obtains the training sequence PCCPCH Midamble of the main public control physical channel from the TS0 time slot of each neighboring cell, and compares it with The basic information of each neighboring cell obtained in advance

训练序列Midamble进行信道冲击响应估计，得到各个邻小区的信道冲击响应；D、根据各个邻小区的信道冲击响应分别计算各个邻小区的主公共控制物理信道的接收信号编码功率PCCPCH RSCP和系统帧号间观测时间差SFN_SFNOTD。The training sequence Midamble performs channel impulse response estimation to obtain the channel impulse response of each adjacent cell; D. Calculate the received signal coding power PCCPCH RSCP and system frame number of the main common control physical channel of each adjacent cell according to the channel impulse response of each adjacent cell Inter-observation time difference SFN_SFNOTD.

步骤A和步骤B之间还包括：判断各个邻小区的DwPTS是否有效，若是，则进行步骤B，否则，结束。Between step A and step B also includes: judging whether the DwPTS of each neighboring cell is valid, if yes, proceed to step B, otherwise, end.

并且，步骤A具体为：A1、UE接收本UE的服务小区下发的广播消息，从中获得各个邻小区的基本Midamble，并由此确定各个邻小区的下行导频码SYNC_DL；A2、UE将各个邻小区的SYNC_DL分别与UE从各个邻小区和本UE的服务小区接收到的DwPTS数据进行复相关，获得各个邻小区的峰值和峰值位置点，所述峰值为各个邻小区下发的DwPCH的功率，所述峰值位置点为各个邻小区DwPTS的位置。In addition, step A specifically includes: A1. UE receives the broadcast message issued by the serving cell of the UE, obtains the basic Midamble of each neighboring cell from it, and determines the downlink pilot code SYNC_DL of each neighboring cell; A2. UE sends each The SYNC_DL of the adjacent cell is complexly correlated with the DwPTS data received by the UE from each adjacent cell and the serving cell of the UE, and the peak value and peak position point of each adjacent cell are obtained. The peak value is the power of the DwPCH delivered by each adjacent cell , the peak location point is the location of each neighboring cell DwPTS.

另外，判断各个邻小区的DwPTS是否有效具体为：判断P_max/P_i＜P_T是否成立，若成立，则邻小区的DwPTS有效，否则，邻小区的DwPTS无效，其中，P_max是所有邻小区DwPTS功率中的最大功率值，P_i为邻小区下发的DwPTS功率，P_T是预先设定的阈值。In addition, judging whether the DwPTS of each neighboring cell is valid is as follows: judging whether P_max /P_i <_PT holds true, if true, the DwPTS of the neighboring cell is valid, otherwise, the DwPTS of the neighboring cell is invalid, wherein P_max is the The maximum power value in the DwPTS power of the cell, P_i is the DwPTS power issued by the neighboring cell, and P_T is the preset threshold.

步骤B进一步为：B1、UE分别根据各个邻小区下发的DwPTS位置信息与服务小区下发的DwPTS位置信息，计算UE接收各个邻小区下发的时隙与服务小区下发的时隙之间的时间差Tn；B2、UE根据各个邻小区的时间差Tn和服务小区下发的TS0时隙位置获得各个邻小区下发的TS0时隙位置。Step B is further: B1. The UE calculates the time slot between the UE receiving the time slot issued by each adjacent cell and the time slot issued by the serving cell according to the DwPTS location information issued by each adjacent cell and the DwPTS location information issued by the serving cell. B2. The UE obtains the TS0 time slot position delivered by each neighboring cell according to the time difference Tn of each neighboring cell and the TS0 time slot position delivered by the serving cell.

计算PCCPCH RSCP进一步包括：a1、确定信道冲击响应的噪声功率σ_i²，i＝1，...n，n为噪声功率的个数；a2、根据$h_i^2={\mathrm{\&epsiv;}}_{\mathrm{CHE}}^2{\mathrm{\&sigma;}}_i^2$计算各个邻小区的PCCPCH信道的估计窗口内的各个信号抽头，其中，ε_CHE²是信噪比门限，σ_i²为信道冲击响应的噪声功率；(a3)、通过${\mathrm{\&sigma;}}_{\mathrm{PCCPCH},\mathrm{AGC}}^2=\underset{i=0}{\overset{N}{\mathrm{\&Sigma;}}}{\left|h_i\right|}^2,$${\mathrm{\&sigma;}}_{\mathrm{PCCPCH}}^2={\mathrm{\&sigma;}}_{\mathrm{PCCPCH},\mathrm{AGC}}^2/g_{\mathrm{AGC}}^2$计算PCCPCH RSCP；其中：h_i为PCCPCH信道的估计窗口内的信号抽头，g_AGC为Calculating the PCCPCH RSCP further includes: a1, determining the noise power σ_i² of the channel impulse response, i=1,...n, where n is the number of noise powers; a2, according to$h_i^2={\mathrm{\&epsiv;}}_{\mathrm{CHE}}^2{\mathrm{\&sigma;}}_i^2$ Calculate each signal tap in the estimation window of the PCCPCH channel of each neighboring cell, wherein, ε_CHE² is the signal-to-noise ratio threshold, and σ_i² is the noise power of the channel impulse response; (a3), by${\mathrm{\&sigma;}}_{\mathrm{PCCPCH},\mathrm{AGC}}^2=\underset{i=0}{\overset{N}{\mathrm{\&Sigma;}}}{\left|h_i\right|}^2,$${\mathrm{\&sigma;}}_{\mathrm{PCCPCH}}^2={\mathrm{\&sigma;}}_{\mathrm{PCCPCH},\mathrm{AGC}}^2/g_{\mathrm{AGC}}^2$ Calculate the PCCPCH RSCP; where: h_i is the signal tap in the estimation window of the PCCPCH channel, and g_AGC is

AGC因子。并且通过${\stackrel{\&OverBar;}{\mathrm{\&sigma;}}}_{\mathrm{PCCPCH}}^2=(1-p){\stackrel{\&OverBar;}{\mathrm{\&sigma;}}}_{\mathrm{PCCPCH}}^2+{\mathrm{p\&sigma;}}_{\mathrm{PCCPCH}}^2$对所述PCCPCH RSCP进行平滑，其中，p为平滑因子，σ_PCCPCH²为PCCPCH RSCP的本次测量值的均值，是对测量值进行平滑的结果，(1-p)σ_PCCPCH²为PCCPCH RSCP的前一次测量值的均值，σ_PCCPCH²为PCCPCH RSCP的本次测量得到的瞬时值。AGC factor. and pass${\stackrel{\&OverBar;}{\mathrm{\&sigma;}}}_{\mathrm{PCCPCH}}^2=(1-p){\stackrel{\&OverBar;}{\mathrm{\&sigma;}}}_{\mathrm{PCCPCH}}^2+{\mathrm{p\&sigma;}}_{\mathrm{PCCPCH}}^2$ Smoothing the PCCPCH RSCP, where p is a smoothing factor, σ_PCCPCH² is the mean value of the measured value of PCCPCH RSCP, which is the result of smoothing the measured value, (1-p) σ_PCCPCH² is the value of PCCPCH RSCP The mean value of the previous measurement value, σ_PCCPCH² is the instantaneous value obtained from the current measurement of PCCPCH RSCP.

计算邻小区的SFN_SFN OTD具体为：先计算该邻小区PCCPCP信道冲击响应峰值点位置Peak_i，然后通过Pos_i*8+Peak_i-Peak_des计算邻小区的SFN-SFN OTD，其中，Pos_i为邻小区的DwPTS位置，Peak_des为邻小区PCCPCH在UE信道估计窗口中的期望位置。并且，通过OTD＝(1-p′)·OTD+p′·OTD对所述OTD进行平滑，其中，p′为平滑因子，OTD为本次SFN_SFN OTD的测量值的均值，(1-p′)·OTD为前一次SFN_SFN OTD的测量值的均值，OTD为SFN_SFN OTD的本次测量得到的瞬时值。The calculation of the SFN_SFN OTD of the neighboring cell is as follows: first calculate the peak_i of the PCCPCP channel impulse response of the neighboring cell, and then calculate the SFN-SFN OTD of the neighboring cell through Pos_i *8+Peak_i -Peak_des, where Pos_i is the The DwPTS position of the cell, Peak_des is the expected position of the adjacent cell PCCPCH in the UE channel estimation window. And, the OTD is smoothed by OTD=(1-p') OTD+p' OTD, wherein p' is a smoothing factor, OTD is the mean value of the measured values of this SFN_SFN OTD, (1-p' )·OTD is the average value of the previous measurement of SFN_SFN OTD, and OTD is the instantaneous value obtained from the current measurement of SFN_SFN OTD.

步骤A2中UE接收到的DwPTS数据包括：UE接收下行时隙，获得服务小区下发的DwPTS时隙的起始位置，然后从起始位置开始提取出128chip的数据做为UE接收到DwPTS数据。The DwPTS data received by the UE in step A2 includes: the UE receives the downlink time slot, obtains the start position of the DwPTS time slot issued by the serving cell, and then extracts the data of 128 chips from the start position as the DwPTS data received by the UE.

与现有技术相比，本发明具有以下优点：本发明先通过DwPTS检测，得到DwPTS位置信息和功率信息，再根据DwPTS位置信息找到TS0PCCPCHMidamble和各个邻小区下发的时隙与服务小区下发的同步时隙到达UE的时间差Tn，然后利用TS0 Midamble测量PCCPCH RSCP和SFN_SFN OTD的方法，有效地扩大了邻小区测量的时间差范围。UE根据各个邻小区的时间差Tn得到UE与各个邻小区进行信道冲击响应估计时，能够得到针对各个邻小区的信道估计窗，由此获得各个邻小区的测量数据，进而提高邻小区的测量范围。Compared with the prior art, the present invention has the following advantages: the present invention first obtains DwPTS position information and power information through DwPTS detection, and then finds TS0PCCPCHMidamble and the time slots issued by each neighboring cell and the time slot issued by the serving cell according to the DwPTS position information. The time difference Tn of the synchronization time slot arriving at the UE, and then using TS0 Midamble to measure PCCPCH RSCP and SFN_SFN OTD, effectively expands the range of time difference measured by neighboring cells. When the UE estimates the channel impulse response between the UE and each adjacent cell based on the time difference Tn of each adjacent cell, it can obtain the channel estimation window for each adjacent cell, thereby obtaining the measurement data of each adjacent cell, and further improving the measurement range of the adjacent cell.

另外，本发明在进行测量过程中，还判断邻小区下发的DwPTS数据是否有效，然后在DwPTS数据检测有效的基础上，根据DwPTS位置信息找到TS0PCCPCH Midamble，利用TS0Midamble测量PCCPCH RSCP和SFN_SFN OTD的方法，提高了测量准确度。In addition, during the measurement process, the present invention also judges whether the DwPTS data issued by the adjacent cell is valid, and then finds the TSOPCCPCH Midamble according to the DwPTS position information on the basis of the DwPTS data detection being valid, and uses the TSOMidamble to measure PCCPCH RSCP and SFN_SFN OTD method , which improves the measurement accuracy.

还有，为了避免偶尔的测量偏差带来的测量值的抖动，对测量值进行平滑处理，提高了在fading信道的情况下测量的准确性和稳定性，是一种适用范围较广，能为小区间切换带来准确可靠依据的邻小区测量方法。In addition, in order to avoid the jitter of the measured value caused by the occasional measurement deviation, the measured value is smoothed, which improves the accuracy and stability of the measurement in the case of fading channels. It is a wide range of applications and can be used for Inter-cell handover brings accurate and reliable neighbor cell measurement method.

附图说明Description of drawings

图1是现有技术中进行邻小区测量一种方法的流程图；Fig. 1 is a flow chart of a method for measuring neighboring cells in the prior art;

图2是TD-SCDMA子帧结构示意图；Fig. 2 is a schematic diagram of the TD-SCDMA subframe structure;

图3是现有技术中进行邻小区测量的第二种方法的流程图；Fig. 3 is a flow chart of the second method for measuring adjacent cells in the prior art;

图4是本发明邻小区测量方法的流程示意图；Fig. 4 is a schematic flow chart of the method for measuring neighboring cells in the present invention;

图5是为UE获得各个邻小区的下行导频时隙DwPTS的位置及功率信息的流程示意图；FIG. 5 is a schematic flow diagram of obtaining the position and power information of the downlink pilot time slot DwPTS of each neighboring cell for the UE;

图6是计算一个邻小区PCCPCH RSCP的方法流程图；Fig. 6 is a flow chart of the method for calculating a neighboring cell PCCPCH RSCP;

图7是计算一个邻小区的SFN_SFN OTD的流程图。Fig. 7 is the flowchart of calculating the SFN_SFN OTD of a neighboring cell.

具体实施方式Detailed ways

以下结合附图，具体说明本发明。The present invention will be described in detail below in conjunction with the accompanying drawings.

本发明在进行邻小区测量时，将测量步骤分为二大步骤：第一步骤：UE分别计算各个邻小区的下行导频时隙DwPTS的位置及功率信息，第二步骤：根据各个邻小区的DwPTS的位置信息获得各个邻小区的TS0时隙和各个邻小区下发的时隙与服务小区下发的同步时隙到达UE的时间差Tn，UE再进行各个邻小区的信道冲击响应估计，获得信息冲击响应，进而计算各个邻小区的PCCPCH RSCP和SFN_SFN OTD，以便于UE在小区重选或切换时能够驻留在服务质量更佳的服务小区。UE根据各个邻小区的时间差Tn得到UE与本邻小区进行信道冲击响应估计时，能够得到针对各个邻小区的信道估计窗，由此获得各个邻小区的测量数据，进而提高邻小区的测量范围，以及获得更佳的测量准确性。The present invention divides the measurement step into two major steps when performing adjacent cell measurement: the first step: the UE calculates the position and power information of the downlink pilot time slot DwPTS of each adjacent cell, and the second step: according to each adjacent cell The location information of the DwPTS obtains the TS0 time slots of each neighboring cell and the time difference Tn between the time slots delivered by each neighboring cell and the synchronization time slot delivered by the serving cell to reach the UE, and then the UE estimates the channel impulse response of each neighboring cell to obtain the information Impulse response, and then calculate the PCCPCH RSCP and SFN_SFN OTD of each neighboring cell, so that the UE can reside in a serving cell with better service quality during cell reselection or handover. When the UE obtains the channel impulse response estimation between the UE and the neighboring cell according to the time difference Tn of each neighboring cell, it can obtain the channel estimation window for each neighboring cell, thereby obtaining the measurement data of each neighboring cell, and then improving the measurement range of the neighboring cell. and better measurement accuracy.

本发明在第一步骤中，UE根据本UE接收到的DwPTS数据得到各个邻小区下发DwPTS的功率信息，并且当邻小区下发DwPTS数据无效时，则不进行第二大步骤的测量，依此来提高测量的准确性。In the first step of the present invention, the UE obtains the power information of the DwPTS delivered by each neighboring cell according to the DwPTS data received by the UE, and when the DwPTS data delivered by the neighboring cell is invalid, the measurement of the second major step is not performed, according to This improves the accuracy of the measurement.

请参阅图4，其为本发明邻小区测量方法的流程示意图。它包括以下步骤：首先，UE获得各个邻小区的下行导频时隙DwPTS的位置及功率信息(步骤S310)；然后，UE分别根据各个邻小区的DwPTS位置信息，确定各个邻小区的TS0时隙的位置(步骤S320)；随后，UE从各个邻小区的TS0时隙中获得主公共控制物理信道的训练序列PCCPCH Midamble，并将之与预先获得的各个邻小区的基本训练序列Midamble进行信道冲击响应估计，获得各个邻小区的信道冲击响应估计(步骤S330)；最后，根据各个邻小区的信道冲击响应分别计算各个邻小区的主公共控制物理信道的接收信号编码功率PCCPCHRSCP和系统帧号间观测时间差SFN_FN OTD(步骤S340)。Please refer to FIG. 4 , which is a schematic flowchart of the neighbor cell measurement method of the present invention. It includes the following steps: first, the UE obtains the position and power information of the downlink pilot time slot DwPTS of each neighboring cell (step S310); then, the UE determines the TS0 time slot of each neighboring cell according to the DwPTS position information of each neighboring cell position (step S320); subsequently, the UE obtains the training sequence PCCPCH Midamble of the main common control physical channel from the TS0 time slots of each neighboring cell, and performs channel impulse response with the basic training sequence Midamble of each neighboring cell obtained in advance Estimate, obtain the channel impulse response estimate (step S330) of each adjacent cell; Finally, calculate respectively the received signal coding power PCCPCHRSCP of the main public control physical channel of each adjacent cell and the observation time difference between the system frame numbers according to the channel impulse response of each adjacent cell SFN_FN OTD (step S340).

实际测量过程中，为了寻找到通信质量更佳的小区，因此UE在测量过程中对测量的邻小区进行筛选。比如：在步骤S310时还增加了判断各个邻小区的DwPTS是否有效，若有效，所述邻小区才进行步骤S320，否则，UE不进行该邻小区的PCCPCH RSCP和SFN_SFN OTD的测量，以此来提高测量的效率。In the actual measurement process, in order to find a cell with better communication quality, the UE screens the measured neighboring cells during the measurement process. For example: in step S310, it is also added to determine whether the DwPTS of each neighboring cell is valid, and if it is valid, the neighboring cell will perform step S320, otherwise, the UE will not measure the PCCPCH RSCP and SFN_SFN OTD of the neighboring cell, so as to Improve the efficiency of measurement.

以下以一个实例来具体说明整个测量过程。The following uses an example to specifically illustrate the entire measurement process.

首先介绍UE如何获得各个邻小区的下行导频时隙DwPTS的位置及功率信息。请参阅图5，其为UE获得各个邻小区的下行导频时隙DwPTS的位置及功率信息的流程示意图。Firstly, it is introduced how the UE obtains the position and power information of the downlink pilot time slot DwPTS of each neighboring cell. Please refer to FIG. 5 , which is a schematic flowchart of the UE obtaining the location and power information of the downlink pilot time slot DwPTS of each neighboring cell.

首先进行步骤S410，当UE与服务小区进行同步后，UE能定期接收服务小区下发的BCH(广播)消息，由此获得各个邻小区的SYNC-DL。First, step S410 is performed. After the UE is synchronized with the serving cell, the UE can periodically receive BCH (broadcast) messages sent by the serving cell, thereby obtaining SYNC-DL of each neighboring cell.

BCH包括服务小区的各个邻小区信息，各个邻小区信息中包含邻小区的小区ID信息，即邻小区的基本Midamble(中间训练序列)。而一个SYNC-DL(下行导频码)和一个扰码组相互对应，每个扰码组包含4个特定的扰码，每个扰码对应一个基本Midamble，因此UE根据基本Midamble就能获得该邻小区的SYNC-DL。The BCH includes the information of each neighboring cell of the serving cell, and each neighboring cell information includes the cell ID information of the neighboring cell, that is, the basic Midamble (middle training sequence) of the neighboring cell. A SYNC-DL (downlink pilot code) corresponds to a scrambling code group. Each scrambling code group contains 4 specific scrambling codes. Each scrambling code corresponds to a basic Midamble. Therefore, the UE can obtain the basic Midamble according to the basic Midamble. SYNC-DL of neighboring cells.

然后进行步骤S420：将各个邻小区的SYNC_DL与UE接收到的DwPTS数据部分进行复相关，获得各个邻小区的峰值和峰值位置点分别做为本邻小区下发的DwPCH的功率及邻小区DwPTS的位置。Then proceed to step S420: perform complex correlation between the SYNC_DL of each neighboring cell and the DwPTS data received by the UE, and obtain the peak value and peak position point of each neighboring cell as the power of the DwPCH delivered by the neighboring cell and the DwPTS of the neighboring cell, respectively. Location.

各个小区(包括邻小区和服务小区)的DwPTS都是按照正常时序发送的，由于各个小区之间是同步的，又由于各个邻小区和服务小区相隔距离不同，因此各个小区的DwPTS到达UE的时间点存在一定的偏差，进而导致UE在同一个时间点收到的是各个小区发送的混迭在一起的DwPTS数据。The DwPTS of each cell (including the neighboring cell and the serving cell) is sent according to the normal timing. Since the cells are synchronized and the distances between the neighboring cells and the serving cell are different, the time for the DwPTS of each cell to reach the UE There is a certain deviation in the points, which leads to the fact that what the UE receives at the same time point is the aliased DwPTS data sent by each cell.

DwPTS时隙中前96Chip数据为下行导频码。UE与服务小区同步后，当UE接收到下行时隙时，UE预先获得服务小区下发的DwPTS时隙的起始位置，然后从起始位置开始提取出96chip的数据做为UE接收到DwPTS数据。为提高测量范围，本发明从DwPTS的起始位置开始提取出128chip的数据做为DwPTS数据。The first 96 Chip data in the DwPTS time slot are downlink pilot codes. After the UE is synchronized with the serving cell, when the UE receives the downlink time slot, the UE obtains the starting position of the DwPTS time slot issued by the serving cell in advance, and then extracts the data of 96 chips from the starting position as the DwPTS data received by the UE. . In order to improve the measurement range, the present invention extracts the data of 128 chips from the initial position of DwPTS as DwPTS data.

UE将预先获得的各个邻小区的SYNC_DL码与上述的DwPTS数据进行复相关，得到不同的相关值。比如采用移位复相关的方法进行每一个邻小区的SYNC_DL码与UE接收到的DwPTS数据进行复相关，不同的移位得到不同的相关结果，因此各个邻小区都能得到多个相关功率值，找到的峰值功率值即为所述邻小区下发的DwPCH的功率，而所述峰值对应的移位即为所述小区DwPTS的位置。The UE performs complex correlation between the pre-acquired SYNC_DL codes of each neighboring cell and the above DwPTS data to obtain different correlation values. For example, the shifted complex correlation method is used to perform complex correlation between the SYNC_DL code of each neighboring cell and the DwPTS data received by the UE. Different shifts can obtain different correlation results, so each neighboring cell can obtain multiple correlation power values. The found peak power value is the power of the DwPCH delivered by the neighboring cell, and the shift corresponding to the peak value is the position of the DwPTS of the cell.

步骤S430：找到各个邻小区中最大功率值和相关位置信息作为各个邻小区下发的DwPTS功率及位置信息。Step S430: Find the maximum power value and related location information in each neighboring cell as the DwPTS power and location information delivered by each neighboring cell.

步骤S440：令P_max＝max{P₀，P₁，Λ，P_N}，其中，{P₀，P₁，Λ，P_N}分别为所有邻小区的DwPTS功率，即从所有邻小区下发的DwPTS功率中找出最大功率值P_max；Step S440: Let P_max =max{P₀ , P₁ , Λ, P_N }, where {P₀ , P₁ , Λ, P_N } are the DwPTS powers of all neighboring cells, that is, from all neighboring cells Find the maximum power value P_max from the transmitted DwPTS power;

步骤S450：判断每个邻小区DwPTS检测是否有效：如果P_max/P_i＜P_T，则认为第i个小区下发的DwPTS检测有效，置有效标志S_i＝1；否则，置有效标志S_i＝0；其中P_T为DwPTS检测门限，P_i为第i个邻小区的DwPTS功率。Step S450: Determine whether the DwPTS detection of each neighboring cell is valid: if P_max /P_i <_PT , then it is considered that the DwPTS detection issued by the i-th cell is valid, and the valid flag S_i =1 is set; otherwise, the valid flag S is set_i =0; where P_T is the DwPTS detection threshold, and P_i is the DwPTS power of the ith neighboring cell.

然后，再介绍如何计算各个邻小区的PCCPCH RSCP。Then, how to calculate the PCCPCH RSCP of each neighboring cell is introduced.

由于各个邻小区的PCCPCH RSCP测量值的计算步骤相同。因此，我们就以计算一个PCCPCH RSCP为例来具体说明计算过程。请参阅图6，其为计算一个邻小区PCCPCH RSCP的方法流程图。Since the calculation steps of the PCCPCH RSCP measurement values of each neighboring cell are the same. Therefore, we take the calculation of a PCCPCH RSCP as an example to illustrate the calculation process in detail. Please refer to FIG. 6, which is a flowchart of a method for calculating the PCCPCH RSCP of a neighboring cell.

步骤S510：UE读取该邻小区DwPTS位置有效标志，如果DwPTS位置有效，则进行步骤S520；否则，该次测量值为0，并结束。Step S510: The UE reads the valid flag of the DwPTS location of the neighboring cell, and if the DwPTS location is valid, proceed to step S520; otherwise, the measurement value is 0 and ends.

步骤S520：UE根据各个邻小区的DwPTS位置信息，确定各个邻小区的TS0时隙的位置。Step S520: The UE determines the position of the TS0 time slot of each neighboring cell according to the DwPTS position information of each neighboring cell.

首先，UE根据各个邻小区下发的DwPTS位置信息与服务小区下发的DwPTS位置信息，计算UE接收各个邻小区下发的时隙与服务小区下发的时隙之间的时间差Tn；然后，UE根据各个邻小区的时间差Tn及服务小区下发的TS0时隙位置获得本邻小区下发的TS0时隙位置。比如：服务小区下发的TS0时隙位置为S1，邻小区下发的TS0时隙位置为Si，邻小区下发的时隙与服务小区下发的时隙差为Tn，则Si＝S1+Tn。First, the UE calculates the time difference Tn between the UE receiving the time slot delivered by each neighboring cell and the time slot delivered by the serving cell according to the DwPTS location information delivered by each neighboring cell and the DwPTS location information delivered by the serving cell; then, The UE obtains the TS0 time slot position delivered by the neighboring cell according to the time difference Tn of each neighboring cell and the TS0 time slot position delivered by the serving cell. For example: the position of the TS0 time slot delivered by the serving cell is S1, the position of the TS0 time slot delivered by the neighboring cell is Si, and the difference between the time slot delivered by the neighboring cell and the time slot delivered by the serving cell is Tn, then Si=S1+ Tn.

步骤S530：UE从邻小区的TS0时隙中获得主公共控制物理信道的训练序列PCCPCH Midamble，并将之与预先获得的各个邻小区的基本训练序列Midamble进行信道冲击响应估计，获得信道冲击响应。Step S530: The UE obtains the training sequence PCCPCH Midamble of the primary common control physical channel from the TS0 time slot of the neighboring cell, and performs channel impulse response estimation with the pre-acquired basic training sequence Midamble of each neighboring cell to obtain the channel impulse response.

UE在步骤S410中已获得各个邻小区的基本Midamble。在步骤S410中，当UE与服务小区进行同步后，UE能定期接收服务小区下发的BCH(广播)消息。BCH包括服务小区的各个邻小区信息，各个邻小区信息中包含邻小区的小区ID信息，即邻小区的基本Midamble(中间训练序列)。The UE has obtained the basic Midamble of each neighboring cell in step S410. In step S410, after the UE is synchronized with the serving cell, the UE can periodically receive BCH (broadcast) messages sent by the serving cell. The BCH includes the information of each neighboring cell of the serving cell, and each neighboring cell information includes the cell ID information of the neighboring cell, that is, the basic Midamble (middle training sequence) of the neighboring cell.

将PCCPCH Midamble与预先获得的各个邻小区的基本训练序列Midamble进行信道冲击响应估计，获得信道冲击响应。The PCCPCH Midamble and the pre-acquired basic training sequence Midamble of each neighboring cell are used for channel impulse response estimation to obtain the channel impulse response.

比如，可以通过以下方法计算信描冲击响应：For example, the letter tracing shock response can be calculated by:

$\stackrel{<span><span>^</span>^</span>}{\mathrm{<span><span>h</span>h</span>}}<span><span>=</span>=</span>\mathrm{<span><span>ifft</span>ifft</span>}<span><span>(</span>(</span>\mathrm{<span><span>fft</span>fft</span>}<span><span>(</span>(</span>{\mathrm{<span><span>e</span>e</span>}}_{\mathrm{<span><span>m</span>m</span>}}<span><span>)</span>)</span><span><span>.</span>.</span><span><span>/</span>/</span>\mathrm{<span><span>fft</span>fft</span>}<span><span>(</span>(</span>{\mathrm{<span><span>m</span>m</span>}}_{\mathrm{<span><span>basic</span>basic</span>}}<span><span>)</span>)</span><span><span>)</span>)</span>$

其中：in:

为信道冲击响应估计

For channel impulse response estimation

e_m为接收的PCCPCH Midamble数据e_m is the received PCCPCH Midamble data

m_basic为基本Midamble码m_basic is the basic Midamble code

fft(·)为FFT(快速傅里叶变换)运算fft( ) is FFT (fast Fourier transform) operation

ifft(·)为IFFT(快速傅里叶逆变换)运算ifft( ) is IFFT (inverse fast Fourier transform) operation

./为矩阵点除运算，即2个矩阵中对应元素相除。./ is the matrix point division operation, that is, the corresponding elements in the two matrices are divided.

步骤S540：根据邻小区的信道冲击响应计算该邻小区的PCCPCH RSCP和SFN_SFN OTD。Step S540: Calculate the PCCPCH RSCP and SFN_SFN OTD of the neighboring cell according to the channel impulse response of the neighboring cell.

(a1)确定信道冲击响应的噪声功率σ_i²，i＝1，...n，n为噪声响应的个数。(a1) Determine the noise power σ_i² of the channel impulse response, i=1,...n, where n is the number of noise responses.

当UE与服务小区建立同步通信时，UE确定一信道估计窗，我们称之为原始信道估计窗。经过步骤S520，UE获知该邻小区下发的时隙与服务小区下发的同步时隙之间的时间差，根据该时间差和原始信道估计窗确定接收本邻小区时隙时的信道估计窗。在该信道估计窗内找到大于预先设定的噪声门限的抽头为信号抽头，小于等于噪声门限的抽头为噪声响应。分别得到各个噪声响应的噪声功率σ_i²，i为噪声功率的序号，n为该信道估计窗中的所有小于等于噪声门限的抽头的个数。When the UE establishes synchronous communication with the serving cell, the UE determines a channel estimation window, which we call an original channel estimation window. After step S520, the UE learns the time difference between the time slot delivered by the neighboring cell and the synchronization time slot delivered by the serving cell, and determines the channel estimation window when receiving the time slot of the neighboring cell according to the time difference and the original channel estimation window. The taps found within the channel estimation window that are larger than the preset noise threshold are signal taps, and the taps that are smaller than or equal to the noise threshold are noise responses. The noise power σ_i² of each noise response is obtained respectively, where i is the serial number of the noise power, and n is the number of all taps less than or equal to the noise threshold in the channel estimation window.

(a2)根据$h_i^2={\mathrm{\&epsiv;}}_{\mathrm{CHE}}^2{\mathrm{\&sigma;}}_i^2$计算各个邻小区的PCCPCH信道的估计窗口内的各个信号抽头，其中，ε_CHE²是信噪比门限，σ_i²为信道冲击响应的噪声功率(a2) According to$h_i^2={\mathrm{\&epsiv;}}_{\mathrm{CHE}}^2{\mathrm{\&sigma;}}_i^2$ Calculate each signal tap in the estimation window of the PCCPCH channel of each adjacent cell, where ε_CHE² is the SNR threshold, σ_i² is the noise power of the channel impulse response

(a3)通过${\mathrm{\&sigma;}}_{\mathrm{PCCPCH},\mathrm{AGC}}^2=\underset{i=0}{\overset{N}{\mathrm{\&Sigma;}}}{\left|h_i\right|}^2,$(a3) pass${\mathrm{\&sigma;}}_{\mathrm{PCCPCH},\mathrm{AGC}}^2=\underset{i=0}{\overset{N}{\mathrm{\&Sigma;}}}{\left|h_i\right|}^2,$

${\mathrm{<span><span>\&sigma;</span>\&sigma;</span>}}_{\mathrm{<span><span>PCCPCH</span>PCCPCH</span>}}^{\mathrm{<span><span>2</span>2</span>}}<span><span>=</span>=</span>{\mathrm{<span><span>\&sigma;</span>\&sigma;</span>}}_{\mathrm{<span><span>PCCPCH</span>PCCPCH</span>}<span><span>,</span>,</span>\mathrm{<span><span>AGC</span>AGC</span>}}^{\mathrm{<span><span>2</span>2</span>}}<span><span>/</span>/</span>{\mathrm{<span><span>g</span>g</span>}}_{\mathrm{<span><span>AGC</span>AGC</span>}}^{\mathrm{<span><span>2</span>2</span>}}$

计算PCCPCH RSCP；Calculate PCCPCH RSCP;

其中：hi为PCCPCH信道的估计窗口内的信号抽头，g_AGC为AGC因子。Among them: hi is the signal tap in the estimated window of the PCCPCH channel, and g_AGC is the AGC factor.

为了避免偶尔的测量偏差带来的测量值的抖动，需要对PCCPCH RSCP测量值进行平滑，具体方法如下：In order to avoid the jitter of the measurement value caused by the occasional measurement deviation, it is necessary to smooth the PCCPCH RSCP measurement value, the specific method is as follows:

${\stackrel{<span><span>\&OverBar;</span>\&OverBar;</span>}{\mathrm{<span><span>\&sigma;</span>\&sigma;</span>}}}_{\mathrm{<span><span>PCCPCH</span>PCCPCH</span>}}^{\mathrm{<span><span>2</span>2</span>}}<span><span>=</span>=</span><span><span>(</span>(</span>\mathrm{<span><span>1</span>1</span>}<span><span>-</span>-</span>\mathrm{<span><span>p</span>p</span>}<span><span>)</span>)</span>{\stackrel{<span><span>\&OverBar;</span>\&OverBar;</span>}{\mathrm{<span><span>\&sigma;</span>\&sigma;</span>}}}_{\mathrm{<span><span>PCCPCH</span>PCCPCH</span>}}^{\mathrm{<span><span>2</span>2</span>}}<span><span>+</span>+</span>{\mathrm{<span><span>p\&sigma;</span>p\&sigma;</span>}}_{\mathrm{<span><span>PCCPCH</span>PCCPCH</span>}}^{\mathrm{<span><span>2</span>2</span>}}$

其中，p为平滑因子，σ_PCCPCH²为PCCPCH RSCP的本次测量值的均值，是对测量值进行平滑的结果，(1-p)σ_PCCPCH²为PCCPCH RSCP的前一次测量值的均值，σ_PCCPCH²为PCCPCH RSCP的本次测量得到的瞬时值。Among them, p is the smoothing factor, σ_PCCPCH² is the mean value of the measured value of PCCPCH RSCP this time, which is the result of smoothing the measured value, (1-p) σ_PCCPCH² is the mean value of the previous measured value of PCCPCH RSCP, σ_PCCPCH² is the instantaneous value obtained from this measurement of PCCPCH RSCP.

最后，介绍如何计算邻小区的SFN_SFN OTD。Finally, how to calculate the SFN_SFN OTD of neighboring cells is introduced.

请参阅图7，其为计算一个邻小区的SFN_SFN OTD的流程图。Please refer to FIG. 7, which is a flow chart of calculating the SFN_SFN OTD of a neighboring cell.

S610：首先读取邻小区DwPTS位置有效标志，如果DwPTS位置有效，则进行步骤S620；如果DwPTS位置无效，则置SFN_SFN OTD(Type 2)＝0。S610: First read the valid flag of the DwPTS position of the adjacent cell, if the DwPTS position is valid, proceed to step S620; if the DwPTS position is invalid, then set SFN_SFN OTD (Type 2)=0.

S620：计算邻小区PCCPCP信道冲击响应峰值点位置Peak_i(1/8chip)。比如，可以通过多项式插值来计算其峰值位置。由于上述计算是现有技术，在此就不再赘述。S620: Calculate the peak_i (1/8chip) position of the PCCPCP channel impulse response peak point of the adjacent cell. For example, its peak position can be calculated by polynomial interpolation. Since the above calculation is a prior art, it will not be repeated here.

S630：通过SFN-SFN OTD(Type 2)＝Pos_i*8+Peak_i-Peak_des来计算邻小区SFN-SFN OTD(Type 2)。S630: Calculate the neighboring cell SFN-SFN OTD (Type 2) by using SFN-SFN OTD (Type 2)=Pos_i *8+Peak_i -Peak_des.

其中：(1)Pos_i为邻小区的DwPTS位置(精度：1CHIP)，(2)Peak_des为邻小区PCCPCH在UE信道估计窗口中的期望位置(1/8chip)。Among them: (1) Pos_i is the DwPTS position of the neighboring cell (accuracy: 1 CHIP), (2) Peak_des is the expected position (1/8chip) of the PCCPCH of the neighboring cell in the UE channel estimation window.

为了提高测量的精度，需要对SFN_SFN OTD的测量值进行平滑，具体方法如下：In order to improve the measurement accuracy, it is necessary to smooth the measurement value of SFN_SFN OTD, the specific method is as follows:

OTD＝(1-p′)·OTD+p′·OTDOTD=(1-p′)·OTD+p′·OTD

其中，p′为平滑因子。横线表示均值，OTD为本次SFN_SFN OTD的测量值的均值，(1-p′)·OTD为前一次SFN_SFN OTD的测量值的均值，OTD为SFN_SFN OTD的本次测量得到的瞬时值。此公式的意思是本次均值，由上次计算得到的均值和本次测量得到的瞬时值加权相加得到。Among them, p' is the smoothing factor. The horizontal line indicates the mean value, OTD is the mean value of the measured value of this SFN_SFN OTD, (1-p′) OTD is the mean value of the measured value of the previous SFN_SFN OTD, and OTD is the instantaneous value obtained by this measurement of SFN_SFN OTD. The meaning of this formula is the average value of this time, which is obtained by weighted addition of the average value obtained last time and the instantaneous value obtained by this measurement.

以上公开的仅为本发明的几个具体实施例，但本发明并非局限于此，任何本领域的技术人员能思之的变化都应落在本发明的保护范围内。The above disclosures are only a few specific embodiments of the present invention, but the present invention is not limited thereto, and any changes conceivable by those skilled in the art should fall within the protection scope of the present invention.

Claims (10)

Translated fromChinese

1.一种邻小区测量方法，用于用户终端UE进行邻小区测量，其特征在于，包括：1. A neighboring cell measurement method, used for a user terminal UE to perform neighboring cell measurement, is characterized in that, comprising:A、UE获得各个邻小区的下行导频时隙DwPTS的位置及功率信息；A. The UE obtains the position and power information of the downlink pilot time slot DwPTS of each neighboring cell;B、UE分别根据各个邻小区的DwPTS位置信息，确定各个邻小区的TS0时隙的位置；B. The UE determines the position of the TS0 time slot of each neighboring cell according to the DwPTS position information of each neighboring cell;C、UE从各个邻小区的TS0时隙中获得主公共控制物理信道的训练序列PCCPCH Midamble，并将之与预先获得的各个邻小区的基本训练序列Midamble进行信道冲击响应估计，得到各个邻小区的信道冲击响应；C. The UE obtains the training sequence PCCPCH Midamble of the main common control physical channel from the TS0 time slot of each neighboring cell, and performs channel impulse response estimation with the basic training sequence Midamble of each neighboring cell obtained in advance, and obtains the midamble of each neighboring cell channel impulse response;D、根据各个邻小区的信道冲击响应分别计算各个邻小区的主公共控制物理信道的接收信号编码功率PCCPCH RSCP和系统帧号间观测时间差SFN_SFN OTD。D. Calculate the received signal coding power PCCPCH RSCP and the observation time difference between system frame numbers SFN_SFN OTD of the main common control physical channel of each adjacent cell according to the channel impulse response of each adjacent cell.2.如权利要求1所述的邻小区测量方法，其特征在于，步骤A和步骤B之间还包括：2. The neighbor cell measurement method according to claim 1, wherein, between step A and step B, further comprising:判断各个邻小区的DwPTS是否有效，若是，则进行步骤B，否则，结束。Judging whether the DwPTS of each neighboring cell is valid, if yes, proceed to step B, otherwise, end.3.如权利要求1或2所述的邻小区测量方法，其特征在于，步骤A具体为：3. The neighbor cell measurement method according to claim 1 or 2, wherein step A is specifically:A1、UE接收本UE的服务小区下发的广播消息，从中获得各个邻小区的基本Midamble，并由此确定各个邻小区的下行导频码SYNC_DL；A1. The UE receives the broadcast message issued by the serving cell of the UE, obtains the basic Midamble of each adjacent cell, and determines the downlink pilot code SYNC_DL of each adjacent cell;A2、UE将各个邻小区的SYNC_DL分别与UE从各个邻小区和本UE的服务小区接收到的DwPTS数据进行复相关，获得各个邻小区的峰值和峰值位置点，所述峰值为各个邻小区下发的DwPCH的功率，所述峰值位置点为各个邻小区DwPTS的位置。A2. The UE performs complex correlation between the SYNC_DL of each neighboring cell and the DwPTS data received by the UE from each neighboring cell and the serving cell of the UE, and obtains the peak value and peak position point of each neighboring cell. The power of the DwPCH transmitted, and the peak position point is the position of the DwPTS of each neighboring cell.4.如权利要求2所述的邻小区测量方法，其特征在于，判断各个邻小区的DwPTS是否有效具体为：4. The neighbor cell measurement method according to claim 2, wherein judging whether the DwPTS of each neighbor cell is valid is specifically:判断P_max/P_i＜P_T是否成立，若成立，则邻小区的DwPTS有效，否则，邻小区的DwPTS无效，其中，P_max是所有邻小区DwPTS功率中的最大功率值，P_i为邻小区下发的DwPTS功率，P_T是预先设定的阈值。Judging whether P_max /P_i < P_T is true, if true, the DwPTS of the neighboring cell is valid, otherwise, the DwPTS of the neighboring cell is invalid, where P_max is the maximum power value of the DwPTS power of all neighboring cells, and P_i is the The DwPTS power delivered by the cell,_PT is a preset threshold.5.如权利要求1或2所述的邻小区测量方法，其特征在于，步骤B进一步为：5. The neighbor cell measurement method according to claim 1 or 2, wherein step B is further as follows:B1、UE分别根据各个邻小区下发的DwPTS位置信息与服务小区下发的DwPTS位置信息，计算UE接收各个邻小区下发的时隙与服务小区下发的时隙之间的时间差Tn；B1. The UE calculates the time difference Tn between the UE receiving the time slot sent by each neighboring cell and the time slot sent by the serving cell according to the DwPTS location information sent by each neighboring cell and the DwPTS location information sent by the serving cell;B2、UE根据各个邻小区的时间差Tn和服务小区下发的TS0时隙位置获得各个邻小区下发的TS0时隙位置。B2. The UE obtains the TS0 time slot positions delivered by each neighboring cell according to the time difference Tn of each neighboring cell and the TS0 time slot position delivered by the serving cell.6.如权利要求1或2所述的邻小区测量方法，其特征在于，计算PCCPCHRSCP进一步包括：6. The adjacent cell measurement method according to claim 1 or 2, wherein calculating PCCPCH RSCP further comprises:a1、确定信道冲击响应的噪声功率σ_i²，i＝1，...n，n为噪声功率的个数；a1. Determine the noise power σ_i² of the channel impulse response, i=1,...n, where n is the number of noise powers;a2、根据$h_i^2={\mathrm{\&epsiv;}}_{\mathrm{CHE}}^2{\mathrm{\&sigma;}}_i^2$计算各个邻小区的PCCPCH信道的估计窗口内的各个信号抽头，其中，ε_CHE²是信噪比门限，σ_i²为信道冲击响应的噪声功率；a2. According to$h_i^2={\mathrm{\&epsiv;}}_{\mathrm{CHE}}^2{\mathrm{\&sigma;}}_i^2$ Calculate each signal tap in the estimation window of the PCCPCH channel of each adjacent cell, wherein, ε_CHE² is the signal-to-noise ratio threshold, and σ_i² is the noise power of the channel impulse response;a3、通过${\mathrm{\&sigma;}}_{\mathrm{PCCPCH},\mathrm{AGC}}^2=\underset{i=0}{\overset{N}{\mathrm{\&Sigma;}}}{\left|h_i\right|}^2,$a3, pass${\mathrm{\&sigma;}}_{\mathrm{PCCPCH},\mathrm{AGC}}^2=\underset{i=0}{\overset{N}{\mathrm{\&Sigma;}}}{\left|h_i\right|}^2,$${\mathrm{<span><span>\&sigma;</span>\&sigma;</span>}}_{\mathrm{<span><span>PCCPCH</span>PCCPCH</span>}}^{\mathrm{<span><span>2</span>2</span>}}<span><span>=</span>=</span>{\mathrm{<span><span>\&sigma;</span>\&sigma;</span>}}_{\mathrm{<span><span>PCCPCH</span>PCCPCH</span>}<span><span>,</span>,</span>\mathrm{<span><span>AGC</span>AGC</span>}}^{\mathrm{<span><span>2</span>2</span>}}<span><span>/</span>/</span>{\mathrm{<span><span>g</span>g</span>}}_{\mathrm{<span><span>AGC</span>AGC</span>}}^{\mathrm{<span><span>2</span>2</span>}}$计算PCCPCH RSCP；Calculate PCCPCH RSCP;其中：h_i为PCCPCH信道的估计窗口内的信号抽头，g_AGC为AGC因子。Among them: h_i is the signal tap in the estimation window of the PCCPCH channel, and g_AGC is the AGC factor.7.如权利要求6所述的邻小区测量方法，其特征在于，还包括：通过${\stackrel{\&OverBar;}{\mathrm{\&sigma;}}}_{\mathrm{PCCPCH}}^2=(1-p){\stackrel{\&OverBar;}{\mathrm{\&sigma;}}}_{\mathrm{PCCPCH}}^2+{\mathrm{p\&sigma;}}_{\mathrm{PCCPCH}}^2$对所述PCCPCH RSCP进行平滑，其中，p为平滑因子，σ_PCCPCH²为PCCPCH RSCP的本次测量值的均值，是对测量值进行平滑的结果，(1-p)σ_PCCPCH²为PCCPCH RSCP的前一次测量值的均值，σ_PCCPCH²为PCCPCH RSCP的本次测量得到的瞬时值。7. The neighbor cell measurement method according to claim 6, further comprising: by${\stackrel{\&OverBar;}{\mathrm{\&sigma;}}}_{\mathrm{PCCPCH}}^2=(1-p){\stackrel{\&OverBar;}{\mathrm{\&sigma;}}}_{\mathrm{PCCPCH}}^2+{\mathrm{p\&sigma;}}_{\mathrm{PCCPCH}}^2$ Smoothing the PCCPCH RSCP, where p is a smoothing factor, σ_PCCPCH² is the mean value of the measured value of PCCPCH RSCP, which is the result of smoothing the measured value, (1-p) σ_PCCPCH² is the value of PCCPCH RSCP The mean value of the previous measurement value, σ_PCCPCH² is the instantaneous value obtained from the current measurement of PCCPCH RSCP.8.如权利要求1或2所述的邻小区测量方法，其特征在于，计算邻小区的SFN_SFN OTD具体为：8. neighbor cell measurement method as claimed in claim 1 or 2, is characterized in that, calculates the SFN_SFN OTD of neighbor cell specifically as:计算邻小区PCCPCH信道冲击响应峰值点位置Peak_i；Calculate the peak point position Peak_i of the PCCPCH channel impulse response of the adjacent cell;通过Pos_i*8+Peak_i-Peak_des计算邻小区的SFN-SFN OTD；Calculate the SFN-SFN OTD of the neighboring cell by Pos_i *8+Peak_i -Peak_des;其中，Pos_i为邻小区的DwPTS位置，Peak_des为邻小区PCCPCH在UE信道估计窗口中的期望位置。Wherein, Posi_is the DwPTS position of the neighboring cell, and Peak_des is the expected position of the PCCPCH of the neighboring cell in the UE channel estimation window.9.如权利要求8所述的邻小区测量方法，其特征在于，还包括：通过OTD＝(1-p′)·OTD+p′·OTD对所述OTD进行平滑，其中，p′为平滑因子，OTD为本次SFN_SFN OTD的测量值的均值，(1-p′)·OTD为前一次SFN_SFN OTD的测量值的均值，OTD为SFN_SFN OTD的本次测量得到的瞬时值。9. The neighbor cell measurement method according to claim 8, further comprising: smoothing the OTD by OTD=(1-p') OTD+p' OTD, wherein p' is smooth Factor, OTD is the mean value of the measured value of this SFN_SFN OTD, (1-p′)·OTD is the mean value of the measured value of the previous SFN_SFN OTD, and OTD is the instantaneous value obtained by this measurement of SFN_SFN OTD.10.如权利要求3所述的邻小区测量方法，其特征在于，步骤A2中UE接收到的DwPTS数据包括：10. The neighbor cell measurement method according to claim 3, wherein the DwPTS data received by the UE in step A2 includes:UE接收下行时隙，获得服务小区下发的DwPTS时隙的起始位置，然后从起始位置开始提取出128chip的数据做为UE接收到DwPTS数据。The UE receives the downlink time slot, obtains the start position of the DwPTS time slot issued by the serving cell, and then extracts the data of 128 chips from the start position as the DwPTS data received by the UE.

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