WO2012119403A1 - 一种通信系统频段搜索的方法和装置 - Google Patents
一种通信系统频段搜索的方法和装置 Download PDFInfo
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- WO2012119403A1 WO2012119403A1 PCT/CN2011/078654 CN2011078654W WO2012119403A1 WO 2012119403 A1 WO2012119403 A1 WO 2012119403A1 CN 2011078654 W CN2011078654 W CN 2011078654W WO 2012119403 A1 WO2012119403 A1 WO 2012119403A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
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- the present invention relates to the field of communication systems, and more particularly to the field of communication system band search technology.
- a user equipment also referred to as a terminal
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- the PSS signal repetition period is 5ms, while the configurable frequency band of the 3GPP LTE system is generally wide, such as the widest frequency band is 100MHZ. If the UE directly searches for the frequency points in any frequency band one by one, the UE will face a problem that takes a long time, the power consumption of the UE becomes large, and the user's feeling is also poor.
- the prior art has respectively tried a method of frequency point power measurement and a frequency band search method based on fast Fourier transform (FFT) spectrum analysis to shorten the time for the UE to search for a cell existing in an LTE system.
- FFT fast Fourier transform
- the frequency power measurement method is a power measurement of signals at all frequency points in the frequency band, and the frequency of the frequency search is determined by the measured power level.
- the frequency band can also allow other communication systems to exist, such as GSM, WCDMA, and the like. In this way, since the signal transmission power of the different system tends to be larger than that of the LTE system, the carrier frequency of the different system will be ranked in front of the true frequency point, and the frequency band search time is too long.
- Embodiments of the present invention provide a method and apparatus for frequency band search of a communication system, which can reduce a cell search time of a UE.
- a method for searching a frequency band of a communication system comprising: Obtaining a normalized cross-correlation value of the signal of the carrier frequency point by normalizing the time domain sequence of the primary synchronization signal PSS and the time domain signal of the carrier frequency point;
- a device for searching a frequency band of a communication system comprising:
- a normalized cross-correlation value obtaining unit configured to obtain a normalized cross-correlation value of the signal of the carrier frequency point by normalizing the time domain sequence of the PSS and the time domain signal of the carrier frequency point;
- a detecting unit configured to detect whether a normalized cross-correlation value of the signal of the carrier frequency is greater than a preset normalized cross-correlation threshold
- an initial search unit configured to perform an initial search on the carrier frequency point when a signal normalized cross-correlation value of the carrier frequency point is greater than the normalized cross-correlation threshold value.
- the method and device for searching a frequency band of a communication system obtains a normalized cross-correlation value of the signal of the carrier frequency point by normalizing the time domain sequence of the PSS and the time domain signal of the carrier frequency point. And performing an initial search on the carrier frequency point when a signal normalized cross-correlation value of the carrier frequency point is greater than the normalized cross-correlation threshold value.
- the normalized cross-correlation values can be compared directly, and the frequency points are directly excluded, and the initial search is not needed, thereby shortening the initial search time and the number of times of the UE.
- FIG. 1 is a schematic flow chart of a method for searching a frequency band of a communication system according to Embodiment 1 of the present invention
- FIG. 2 is a block diagram of an apparatus for searching for a frequency band of an LTE system according to Embodiment 1 of the present invention
- FIG. 3 is a schematic flowchart of a method for searching a frequency band of an LTE system according to Embodiment 2 of the present invention
- FIG. 4 is a schematic flow chart of a method for searching for a frequency band of an LTE system according to Embodiment 3 of the present invention
- FIG. 5 is a block diagram of an apparatus for searching for a frequency band of an LTE system according to Embodiment 4 of the present invention
- FIG. 6 is a block diagram of an apparatus for searching for a frequency band of an LTE system according to Embodiment 5 of the present invention
- FIG. 7 is a schematic diagram of an LTE system according to Embodiment 5 of the present invention
- Another block diagram of the device for band search is a block diagram of an apparatus for searching for a frequency band of an LTE system according to Embodiment 4 of the present invention.
- FIG. 6 is a block diagram of an apparatus for searching for a frequency band of an LTE system according to Embodiment 5 of the present invention
- FIG. 7 is a schematic diagram of an LTE system according to Embodiment 5 of the present invention
- Another block diagram of the device for band search is another block diagram of the device for band search.
- a method for searching a frequency band of a communication system includes the following steps:
- S102 Detect whether a normalized cross-correlation value of the signal of the carrier frequency is greater than a preset normalized cross-correlation threshold.
- the UE needs to perform an initial search from the power-on search to camping on the appropriate cell.
- the initial search of the cell needs to complete the process of detecting the cell ID, orthogonal frequency division multiplexing (OFDM) symbol synchronization and frame synchronization, cyclic prefix (CP) type detection, frequency offset size estimation, etc., specific search process. I won't go into details here.
- OFDM orthogonal frequency division multiplexing
- CP cyclic prefix
- the embodiment of the present invention further provides a device for searching a frequency band of a communication system.
- the device includes a normalized cross-correlation value acquisition unit 21, a detection unit 22, and an initial search unit 23.
- the normalized cross-correlation value obtaining unit 21 is configured to obtain a signal normalized cross-correlation value of the carrier frequency point by normalizing the time domain sequence of the PS S and the time domain signal of the carrier frequency point.
- the detecting unit 22 is configured to detect whether the normalized cross-correlation value of the signal of the carrier frequency is greater than a preset normalized cross-correlation threshold.
- the initial search unit 23 is configured to perform an initial search on the carrier frequency point when a signal normalized cross-correlation value of the carrier frequency point is greater than the normalized cross-correlation threshold value.
- the detection unit 22 and the initial search unit 23 may be located in the same processor, and the normalized cross-correlation value acquisition unit 21 may be another processor.
- the apparatus may be located in one UE or in a baseband processor of the UE.
- the method and device for searching a frequency band of a communication system perform normalization processing by using a time domain sequence of a PS S and a time domain signal of a carrier frequency point to obtain a normalized cross-correlation value of the carrier frequency point, And determining the carrier frequency of the non-communication system by judging the normalized cross-correlation value of the carrier frequency point and the preset normalized cross-correlation threshold value, and the carrier frequency point of the part is not required.
- An initial search is performed, thereby shortening the time and number of times the UE terminal band search is performed.
- the embodiment of the present invention provides a method for searching a frequency band of a communication system.
- the specific embodiment of the present invention is specifically illustrated by the LTE system. As shown in FIG. 3, the method includes the following steps:
- the sampling rate of this embodiment can be set to 1.92 Mbps, the sampling time is 5 ms, and the ( ) signal has a total of 9600 Sample point, d is the sample point number of the time domain signal of the carrier frequency point, and d is a value between 0 and 9599.
- the baseband filter receives Time domain signals can also be sampled from multiple 5ms for band search with lower signal to noise ratio.
- ⁇ (2 »is determined to N ID PSS
- the time domain sequence, the time domain sequence is a complex form, and the complex number needs to be conjugated in the calculation process, that is, ⁇ 3 ⁇ 4) is a parameter used to determine the cell identity in the physical layer of the LTE system, and the value is ⁇ 0, 1, 2 ⁇ , the time domain sequence of PSS is uniquely determined by ⁇ ).
- PSSCorr a normalized cross-correlation value
- the PSS can be one or more, when there is only one PSS, the UE can For this
- the PSS calculates a correlation value ⁇ ( ⁇ A) of each sample point, and normalizes the cross-correlation value to the signal whose maximum value is used as the carrier frequency point. If there are multiple PSSs, the UE can target each PSS Calculate the correlation value of each sample point C ⁇ r ⁇ A ⁇ ), that is, each sample of each pss gets a correlation value ⁇ (), and the maximum of all these values is used as the carrier frequency. The signal of the point normalizes the cross-correlation value.
- the physical layer of the LTE system has 504 cell ID identification numbers, which are divided into 168 different groups, and each group has 3 different cell ID identification numbers.
- the signal of each carrier frequency point corresponds to the time domain sequence of three different PSSs, and the corresponding Comparing the values of C d , ) determined by the time domain sequences of the three PSSs, taking the maximum value of the signal normalized cross-correlation value psscorr of the carrier frequency.
- the second largest value can be taken in all ⁇ ( The adjusted scheme can still be effectively detected compared with the prior art, and the time and number of times of the UE frequency band search are shortened.
- step S303 Detect whether a normalized cross-correlation value of the signal of the carrier frequency is greater than a preset normalized cross-correlation threshold.
- the process proceeds to step S304; when the signal normalized cross-correlation value of the carrier frequency point is small, the process proceeds to step S305.
- the preset normalization threshold is a preset normalization threshold value in advance in accordance with the formulas in steps S301 and S302, in the case of estimating the channel signal-to-noise ratio and having a margin.
- S304 Perform an initial search on the carrier frequency point when a signal normalized cross-correlation value of the carrier frequency point is greater than the normalized cross-correlation threshold value.
- the normalized cross-correlation value is the signal power of the carrier frequency, and the correlation between the received signal and the PSS is calculated.
- the signal normalized cross-correlation value of the carrier frequency point is greater than the normalized cross-correlation threshold value, if the signal indicating the carrier frequency point has a greater correlation with the signal of the LTE system, the The carrier frequency is used for initial search.
- S305 When the signal normalized cross-correlation value of the carrier frequency point is not greater than the normalized cross-correlation threshold, or the carrier frequency point does not search for an LTE cell, or the searched LTE cell cannot be performed.
- the time domain signal of another carrier frequency point is normalized with the time domain sequence of the PSS, and the signal normalized cross-correlation value of the other frequency point is obtained, and the detection process is continued.
- the UE In the frequency band configured by the UE, the UE needs to perform an initial search camp on the LTE cell after being powered on.
- the UE receives a signal of a carrier frequency point in the frequency band, acquires a time domain signal through a 1.4 MHz baseband filter, and calculates a power value of the time domain signal of the carrier frequency point! ⁇ .( , and the cross-correlation value XT of the time domain sequence of the PSS and the time domain signal of the carrier frequency point; calculating the correlation value of each sampling point corresponding to the time domain sequence of each PSS , will needle
- the UE may perform an initial search. If the LTE cell is found to exist, the UE attempts to camp on the cell. If the cell cannot camp, the UE needs to switch to another of the band. A carrier frequency point is calculated, and the signal normalized cross-correlation value of the carrier frequency point is calculated, and the search is continued according to the method of the embodiment.
- the UE If the PSSCorr value is greater than the preset normalization threshold, and the UE does not search for the LTE cell after performing the initial search at the carrier frequency, the UE switches to the frequency band to obtain another carrier frequency, and calculates the carrier frequency. The signal of the point normalizes the cross-correlation value.
- the UE directly switches to another carrier frequency, and calculates a signal normalized cross-correlation value of the carrier frequency.
- the UE band search ends.
- the frequency band searching method of the communication system performs normalization processing by using a time domain sequence of the PSS and a time domain signal of the carrier frequency point to obtain a normalized cross-correlation value of the carrier frequency point, by determining the The normalized cross-correlation value of the carrier frequency point and the preset normalized cross-correlation threshold value can filter out the carrier frequency point of the communication system, and does not need to perform an initial search on the carrier frequency point of the part. Thereby shortening the time and number of times of UE frequency band search.
- the embodiment of the present invention further provides a method for searching a frequency band of a communication system.
- the embodiment of the present invention is still described by using an LTE system as an example. As shown in FIG. 4, the method includes:
- S402. Sort the signal normalized cross-correlation values of the plurality of carrier frequency points of the system frequency band according to the order of the largest to smallest, obtain the first frequency point order of the carrier frequency points, and perform the order detection according to the first frequency point. Whether the normalized cross-correlation value of the carrier frequency point is greater than a preset normalized cross-correlation value.
- Step S403. Detect whether a normalized cross-correlation value of the signal of the carrier frequency is greater than a preset normalized cross-correlation threshold; when the signal normalized cross-correlation value of the carrier frequency is large, skip to Step S404; otherwise, the process goes to step S406.
- S405 If the UE searches for an LTE cell, try to camp. If it cannot camp, skip to S406; otherwise, the UE search ends.
- Step 5406 Switch to the next frequency point according to the order of sorting the first frequency points in step S402, and execute step S403.
- the LTE frequency band search method in the embodiment of the present invention may further be: performing normalization processing by using a time domain sequence of the PSS and a time domain signal of a carrier frequency point to obtain a normalized mutual signal of the carrier frequency point. Before detecting the correlation value, first detecting the power level of the carrier frequency point signal, sorting according to the detected power from large to small, obtaining the second frequency point order of the carrier frequency point, and detecting whether the normalized correlation value of the carrier frequency point is greater than a preset normalized cross-correlation threshold, corresponding to when the carrier frequency signal normalization value is not greater than a preset normalized cross-correlation threshold, or an LTE cell is not searched at the frequency, or If the LTE cell cannot be camped on, the signal is switched to the next frequency point according to the order of the second frequency points, and the signal normalized cross-correlation value of the next carrier frequency point is obtained, and the detection is continued. process.
- detecting the power level of the carrier frequency point signal and performing the ordering may also be performed
- the frequency band searching method of the communication system sorts the numerical values of the normalized cross-correlation values of the carrier frequency points in the frequency band, and firstly detects that the normalized cross-correlation value of the highest-ranked carrier frequency points is large. Comparing with the preset normalized cross-correlation threshold value, if the normalized cross-correlation value of the carrier frequency point is large, an initial search is performed on the carrier frequency point, so that the detection of the normalized value can not only screen the communication
- the carrier frequency of the system can further shorten the initial search time of the UE.
- An embodiment of the present invention further provides a device for searching a frequency band of a communication system, and this embodiment Taking the LTE system as an example, as shown in FIG. 5, the method includes: a normalized cross-correlation value acquiring unit 51, a detecting unit 52, and an initial searching unit 53.
- Each unit can be a processor, and each processor can be implemented by an integrated circuit.
- the apparatus may be located in one UE or in a baseband processor of the UE.
- the normalized cross-correlation value obtaining unit 51 is configured to obtain a signal normalized cross-correlation value of the carrier frequency point by normalizing the time domain sequence of the PSS and the time domain signal of the carrier frequency point.
- the normalized cross-correlation value obtaining unit 51 further includes:
- a calculating subunit 51 1 configured to calculate, according to the i th receiving antenna of the user equipment
- the cross-correlation value of each time point of the time domain sequence of the PSS and the time domain signal of the carrier frequency point and the power value of each sample point 1 ⁇ , d is the sampling point number of the time domain signal of the carrier frequency point .
- the detecting unit 52 is configured to detect whether the signal normalized cross-correlation value of the carrier frequency point is greater than a preset normalized cross-correlation threshold value.
- the initial search unit 53 is configured to perform an initial search on the carrier frequency point when the signal normalized cross-correlation value of the carrier frequency point is greater than the normalized cross-correlation threshold value.
- the calculation subunit may further be a time domain sequence for each PSS in the time domain sequence of the plurality of PSSs, and calculate a time domain sequence and a carrier frequency of the PSS corresponding to the i th receive antenna of the UE, respectively.
- the cross-correlation value of each sample point of the time domain signal of the point X person d, and The power value Y of each sampling point Y is d; d is the sampling point number of the time domain signal of the carrier frequency point; the normalized cross-correlation value determining subunit is used to calculate the time domain sequence for each PSS
- the correlation value of each of the sample points is ⁇ , ⁇ ⁇ / ⁇ ) , where / is
- the UE has a number of receiving antennas, and the maximum value of the correlation values c dO of each of the sampling points of the time domain sequence of each PSS is used as a signal normalized cross-correlation value of the carrier frequency point.
- the communication system band search device uses the calculation sub-unit 51 1 and the normalized cross-correlation value determination sub-unit 512 of the normalized cross-correlation value acquisition unit 51 to obtain the normalized cross-correlation of the carrier frequency points.
- the value is determined according to the normalized cross-correlation value of the carrier frequency point and the preset normalized cross-correlation threshold value, and the partial system signal is screened out, which reduces the time and number of times the UE performs the initial search.
- the embodiment of the present invention further provides a device for searching a frequency band of a communication system.
- This embodiment uses an LTE system as an example.
- the method includes a normalized cross-correlation value obtaining unit 61 and a first frequency point sorting unit. 65.
- the normalized cross-correlation value obtaining unit 61 is configured to obtain a normalized mutual value of the signal of the carrier frequency point by normalizing the time domain sequence of the PSS and the time domain signal of the carrier frequency.
- the first frequency point sorting unit 65 sorts the signal normalized cross-correlation values of the plurality of carrier frequency points of the system frequency band in descending order, and obtains the first frequency point order of the carrier frequency points.
- the detecting unit 62 is configured to detect, according to the first frequency point order, whether the signal normalized cross-correlation value of the carrier frequency point is greater than a preset normalized cross-correlation threshold value.
- An initial search unit 63 configured to: when the signal frequency of the carrier frequency is normalized, the cross-correlation value is greater than When the normalized cross-correlation threshold is normalized, an initial search is performed on the carrier frequency.
- another device for searching the frequency band of the LTE system according to the embodiment of the present invention may further include: a power measuring unit 66, configured to measure power of all the carrier frequency signals in the frequency band; And the second frequency point sorting unit 67, sorting the signal powers of the plurality of carrier frequency points in descending order, and acquiring the second frequency point ordering of the plurality of carrier frequency points.
- the detecting unit detects, according to the second frequency point order, whether the normalized cross-correlation value of the signal of the next carrier frequency is greater than a preset normalized cross-correlation threshold. Certainly, detecting the power level of the carrier frequency point signal and performing the sorting may also be performed after acquiring the signal normalized cross-correlation value of the carrier frequency point.
- the frequency band searching device of the communication system obtained by the embodiment of the present invention obtains a normalized cross-correlation value of a carrier frequency point, sorts the value of the signal normalized cross-correlation value of all carrier frequency points, and preferentially detects the normalized cross-correlation value. Large carrier frequency, which can further shorten the time and number of initial search of the UE.
- the LTE frequency band search apparatus may be located in an LTE wireless receiver, such as an LTE baseband processor. It can be understood that the method provided in this embodiment is applicable not only to the LTE system but also to other communication systems having a cell search function, such as a PLMN system.
- the LTE system band search method provided by the embodiment of the present invention can also be used for full-band search of PLMN (Public Land Mobile Network).
- PLMN Public Land Mobile Network
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Description
一种通信系统频段搜索的方法和装置 技术领域
本发明涉及通信系统领域, 尤其涉及通信系统频段搜索技术领域。 背景技术 用户设备(UE, 也称为终端)在已知频段配置的情况下, 需要检测 频段内的哪些频点存在 LTE 系统的小区, 并利用初始搜索将小区搜索 到, 以便尝试驻留到所述小区。 LTE 系统是利用 PSS ( Primary Synchronization Signal, 主同步信号 )和 SSS ( Secondary Synchronization Signal, 辅同步信号) 完成小区搜索, PSS用来完成符号定时同步。 PSS 信号重复周期为 5ms, 而 3GPP LTE系统可配置的频段普遍较宽, 如最 宽的频段为 100MHZ。 若 UE直接对任何频段内的频点逐个依次搜索, 则 UE将面临耗时较长的问题, UE的耗电量变大, 用户的感受也很差。
为了解决这一问题, 现有技术分别尝试了频点功率测量的方法和基 于快速傅里叶变换 (FFT ) 频谱分析的频段搜索方法来缩短 UE搜索存 在 LTE系统小区的时间。
频点功率测量法是对频段内的所有频点的信号的功率大小测量, 通 过测得的功率大小来确定频点搜索的顺序。 然而频段内除 LTE系统外, 还可以允许其他通信系统的存在, 如 GSM、 WCDMA等。 这样由于异 系统的信号发射功率往往会大于 LTE系统,异系统的载波频点会排在真 实频点前面, 同样存在频段搜索时间过长的问题。
基于 FFT频谱分析的频段搜索是利用不同系统的功率谱密度( PSD ) 进行系统识别。 然而由于 LTE系统有多种发射带宽, 这么 PSD识别需 要对每个频点尝试有关所有可能的发射带宽, 这样将导致系统的计算量 和复杂度加大, 仍存在着系统搜索时间过长的问题。
发明内容
本发明的实施例提供一种通信系统频段搜索的方法与装置, 能够减 小 UE的小区搜索时间。
为达到上述目的, 本发明的实施例采用如下技术方案:
一种通信系统频段搜索的方法, 包括:
通过主同步信号 PSS 的时域序列与载波频点的时域信号进行的归 一化处理, 获取所述载波频点的信号归一化互相关值;
检测所述载波频点的信号归一化互相关值是否大于预设的归一化 互相关门限值;
当所述载波频点的信号归一化互相关值大于所述归一化互相关门 限值时, 对所述载波频点进行初始搜索。
一种通信系统频段搜索的装置, 包括:
归一化互相关值获取单元,用于通过 PSS的时域序列与载波频点的 时域信号进行的归一化处理, 获取所述载波频点的信号归一化互相关 值;
检测单元, 用于检测所述载波频点的信号归一化互相关值是否大于 预设的归一化互相关门限值;
初始搜索单元, 用于当所述载波频点的信号归一化互相关值大于所 述归一化互相关门限值时, 对所述载波频点进行初始搜索。
本发明实施例提供的通信系统频段搜索的方法和装置,通过 PSS的 时域序列与载波频点的时域信号进行的归一化处理, 获取所述载波频点 的信号归一化互相关值; 当所述载波频点的信号归一化互相关值大于所 述归一化互相关门限值时, 对所述载波频点进行初始搜索。 这样对于非 此通信系统的信号, 可通过归一化互相关值的大小比较, 直接排除这些 频点, 不需要对其进行初始搜索, 从而缩短了 UE的小区初始搜索时间 和次数。
附图说明 为了更清楚地说明本发明实施例或现有技术中的技术方案, 下面将对实 施例或现有技术描述中所需要使用的附图作简单地介绍, 显而易见地, 下面 描述中的附图仅仅是本发明的一些实施例, 对于本领域普通技术人员来讲, 在不付出创造性劳动的前提下, 还可以根据这些附图获得其他的附图。
图 1为本发明实施例一提供的通信系统频段搜索的方法的流程示意 图;
图 2为本发明实施例一提供的 LTE系统频段搜索的装置的框图; 图 3 为本发明实施例二提供的 LTE 系统频段搜索的方法流程示意
图;
图 4为本发明实施例三提供的 LTE系统频段搜索的方法的流程示意 图;
图 5为本发明实施例四提供的 LTE系统频段搜索的装置的框图; 图 6为本发明实施例五提供的 LTE系统频段搜索的装置的框图; 图 7为本发明实施例五提供的 LTE系统频段搜索的装置的另一种框 图。
具体实施方式
下面将结合本发明实施例中的附图, 对本发明实施例中的技术方案进行 清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而 不是全部的实施例。 基于本发明中的实施例, 本领域普通技术人员在没有做 出创造性劳动前提下所获得的所有其他实施例, 都属于本发明保护的范围。 实施例一、
本发明实施例提供的通信系统频段搜索的方法, 如图 1 所示, 包 括以下步骤:
S101、通过对主同步信号 PSS的时域序列与载波频点的时域信号进 行的归一化处理, 获取所述载波频点的信号归一化互相关值。
5102、检测所述载波频点的信号归一化互相关值是否大于预设的归 一化互相关门限值。
5103、 当所述信号归一化互相关值大于所述归一化互相关门限值 时, 对所述载波频点进行初始搜索。
UE从开机搜索到驻留到合适小区, 需要进行初始搜索。 以 LTE系 统为例,小区初始搜索需要完成小区 ID的检测、正交频分复用 ( OFDM ) 符号同步和帧同步、循环前缀(CP )类型检测、 频偏大小的估计等过程, 具体搜索过程这里不再贅述。
本发明实施例还提供了通信系统频段搜索的装置, 如图 2所示, 包 括归一化互相关值获取单元 21、 检测单元 22、 初始搜索单元 23。
归一化互相关值获取单元 21 , 用于通过 PS S 的时域序列与载波频 点的时域信号进行的归一化处理, 获取所述载波频点的信号归一化互相 关值。
检测单元 22 ,用于检测所述载波频点的信号归一化互相关值是否大 于预设的归一化互相关门限值。
初始搜索单元 23 ,用于当所述载波频点的信号归一化互相关值大于 所述归一化互相关门限值时, 对所述载波频点进行初始搜索。
其中,检测单元 22和初始搜索单元 23可以位于同一个处理器之中, 归一化互相关值获取单元 21 可以是另一处理器。 所述装置可位于一个 UE中或 UE的基带处理器中。
本发明实施例提供的通信系统频段搜索的方法和装置,通过 PS S的 时域序列与载波频点的时域信号进行归一化处理, 获得所述载波频点的 归一化互相关值, 并通过判断所述载波频点的归一化互相关值与预设的 归一化互相关门限值的大小, 筛除掉非该通信系统的载波频点, 不需要 对这部分的载波频点进行初始搜索, 从而缩短了 UE终端频段搜索的时 间和次数。
实施例二、
本发明实施例提供了一种通信系统频段搜索的方法, 本实施例具体 以 LTE系统来具体说明, 如图 3所示, 包括以下步骤:
S301、 计算 PSS 的时域序列与载波频点的时域信号的互相关数值 j (d)和所述载波频点的时域信号的功率数值 (d)。
其中 ( =
+ )|2, ( 为 UE的第 i个接收天线经过基带滤波 二 0 器接收的时域信号, 本实施例的采样率可以设置为 1 .92Mbps , 采样时间 为 5ms , 这样 ( )信号共有 9600个采样点, d为所述载波频点的时域 信号的采样点编号, d为 0至 9599之间的数值。 当然基带滤波器接收的
时域信号, 还可以从多个 5ms中取样采点, 用于支持更低信噪比的频段 搜索。 其中 ( ^(2»为 NID所确定的 PSS的
时域序列, 时域序列为复数形式, 在计算过程中需要对复数进行共轭计 算, 即 ); Λ¾)为 LTE系统物理层中用于确定小区标识的参数, 取 值为 {0,1,2}, PSS的时域序列由 Λ )唯一确定。 Ν为 PSS的时域序列的 长度, 其中 Ν=128, 且 M*L=N, M可取值为 2、 4、 8等。
S302、 确定所述载波频点信号归一化互相关值 PSSCorr, 即 PSSCorr =
Corr{d, ^ ) =∑ ^Ad) lY,{d ,将针对所述每个 PSS的时域序列的所述每个 采样点的相关值 中的最大值作为所述载波频点的信号归一化 互相关值, 即 J^C r= max {Corr(d,N£{ )}, 其中 I为 UE具有接收天线
Λ¾) =0,1,2 1
d=0, ,..D-i 的个数; D 表示 ( 信号的采样点数, 如在上一步骤中, 采样点数 D 取为 9600。 PSS可以为一个或多个, 当 PSS只有一个, 则 UE可针对该
PSS, 计算每个采样点的相关值 ^^(^A ) , 将其中最大值作为所述载波 频点的信号归一化互相关值。 如果 PSS有多个, 则 UE可针对每个 PSS
都计算每个采样点的相关值 C^r^A^) , 即每个 pss的每个样点都得到 一个相关值 ^^( ) , 并再所有这些值中的最大值作为所述载波频点 的信号归一化互相关值。
LTE系统物理层有 504个小区 ID标识号, 分成 168个不同的组, 每组 3 个不同的小区 ID 标识号。 物理层小区 ID 标识号表示为 Λ^ = 3Λ^ + Λ^, 其中 的取值为 {0,1,2} , PSS 的时域序列由 唯一 确定。相应的,每个载波频点的信号,对应 3个不同的 PSS的时域序列, 获取相应的
; 比较 3个 PSS的时域序列所确定 的 C d, )的值, 取最大值为所述载波频点的信号归一化互相关值 psscorr。 在实际应用中, 本领域技术人员可对方案进行适应性调整, 例如, 也可在所有^ ^( 中取第二大值作为
, 这样调整后的 方案相对于现有技术依然可进行有效的检测, 缩短了 UE频段搜索的时 间和次数。
5303、检测所述载波频点的信号归一化互相关值是否大于预设的归 一化互相关门限值。 当所述载波频点的信号归一化互相关值大时, 转入 步骤 S304;当所述载波频点的信号归一化互相关值小时,转入步骤 S305。
预设的归一化门限值是预先根据步骤 S301、 S302 中的公式, 在预 估信道信噪比并富余一定余量的情况下, 预设的归一化门限值。
5304、 当所述载波频点的信号归一化互相关值大于所述归一化互相 关门限值时, 对所述载波频点进行初始搜索。
通过步骤 S301、 S302 中的公式, 所述归一化互相关值是所述载波 频点的信号功率归一, 计算出接收信号与 PSS的相关度。 当所述载波频 点的信号归一化互相关值大于所述归一化互相关门限值时, 则表示该载 波频点的信号与 LTE系统的信号的相关度大,则可开始对所述载波频点 进行初始搜索。
S305、 当所述载波频点的信号归一化互相关值不大于所述归一化互 相关门限值时, 或所述载波频点未搜索到 LTE小区, 或不能对搜索到的 LTE小区进行驻留时,对另一个载波频点的时域信号与 PSS的时域序列 进行归一化处理并获取所述另一个频点的信号归一化互相关值, 并继续 进行检测过程。
对于上述的频段搜索的方法, 具体描述如下:
在 UE所配置的频段内, UE开机后需要对 LTE小区进行初始搜索 驻留。 UE接收频段内一个载波频点的信号, 通过 1.4MHZ基带滤波器, 获取时域信号; 计算载波频点的时域信号的功率数值! ^.( ,及所述 PSS 的时域序列与载波频点的时域信号的互相关数值 X T);对应于每个 PSS 的时域序列, 计算每个采样点的相关值
, 将针
对所述每个 PSS的时域序列的所述每个采样点的相关值^^^,^ 中的 最 大值作 为 所述载 波频 点 的 信 号 归 一化互相 关值 , 即 PSSCorr =
根据计算的所述载波频点 PSSCorr值,与预设的归一化门限值比较, 若 PSSCorr值大, UE可以进行初始搜索, 若搜索到存在 LTE小区, UE 则尝试在该小区驻留, 若小区无法驻留, UE 则需要切换到该频段的另
一载波频点, 计算该载波频点的信号归一化互相关值, 并根据本实施例 的方法继续尝试搜索。
若 PSSCorr值大于预设的归一化门限值, 而 UE在所述载波频点进 行初始搜索后, 未搜索到 LTE小区, 则 UE切换到该频段得另一载波频 点, 计算该载波频点的信号归一化互相关值。
若 PSSCorr值小于或等于预设的归一化门限值, UE则直接切换到 另一载波频点, 计算该载波频点的信号归一化互相关值。
进一步的, 若 UE已经成功驻留到频段内的 LTE小区, 或 UE对频 段内的所有频点进行了处理, 而所述频点载波的信号归一化值不大于预 设的归一化门限值, 或没有搜索到 LTE的小区, 或在搜索到的 LTE小 区没有驻留成功, 则 UE频段搜索结束。
本发明实施例提供的通信系统频段搜索方法,通过 PSS的时域序列 与载波频点的时域信号进行归一化处理, 获得所述载波频点的归一化互 相关值, 通过判断所述载波频点的归一化互相关值与预设的归一化互相 关门限值的大小, 可筛除掉非该通信系统的载波频点, 不需要对这部分 的载波频点进行初始搜索, 从而缩短了 UE频段搜索的时间和次数。
实施例三、
本发明实施例还提供了一种通信系统频段搜索的方法, 本实施例仍 以 LTE系统为例来说明, 如图 4所示, 包括:
S401、通过 PS S的时域序列与载波频点的时域信号进行的归一化处 理, 获取所述载波频点的信号归一化互相关值。
S402、 对系统频段的多个载波频点的信号归一化互相关值按照由大 到小的顺序进行排序, 获取所述载波频点的第一频点排序, 并按照第一 频点排序检测所述载波频点的归一化互相关值是否大于预设的归一化 互相关值。
S403、检测所述载波频点的信号归一化互相关值是否大于预设的归 一化互相关门限值; 当所述载波频点的信号归一化互相关值大, 则跳到
步骤 S404; 否则跳到步骤 S406。
S 404、 当所述信号归一化互相关值大于所述归一化互相关门限值 时, 对所述载波频点进行初始搜索, 若搜索到 LTE 小区, 则跳到步骤 S405 ; 否则跳到步骤 S406。
5405、 若 UE搜索到 LTE小区, 则尝试驻留, 若无法驻留, 则跳到 S406; 反之 UE搜索结束。
5406、 根据步骤 S402 中的所述第一频点排序的顺序, 切换到下一 个频点, 执行步骤 S403。
进一步的, 本发明实施例的 LTE频段搜索方法, 还可以是: 通过 PSS的时域序列与载波频点的时域信号进行的归一化处理,获 取所述载波频点的信号归一化互相关值前, 先检测所述载波频点信号的 功率大小, 根据检测的功率由大到小进行排序, 获取载波频点的第二频 点排序, 检测载波频点的归一化相关值是否大于预设的归一化互相关门 限值, 相应的当所述载波频点信号归一化值不大于预设的归一化互相关 门限值、或在所述频点未搜索到 LTE小区、或无法驻留到搜索到的 LTE 小区, 则按照所述第二频点排序的顺序, 切换到下一个频点, 获取下一 个载波频点的信号归一化互相关值, 并继续执行所述检测过程。 当然, 检测所述载波频点信号的功率大小并执行排序也可在获取所述载波频 点的信号归一化互相关值之后进行。
本发明实施例提供的通信系统频段搜索方法, 通过对频段内载波频 点的归一化互相关值的数值大小进行排序, 首先检测排序最前的载波频 点的归一化互相关值数值大的与预设的归一化互相关门限值比较, 若载 波频点的归一化互相关值大, 对所述载波频点进行初始搜索, 这样通过 归一化值的检测不仅可筛除非该通信系统的载波频点, 进一步的可以缩 短了 UE初始搜索的时间。
实施例四、
本发明实施例还提供了一种通信系统频段搜索的装置, 本实施例
以 LTE系统为例, 如图五所示, 包括: 归一化互相关值获取单元 51、 检测单元 52、 初始搜索单元 53。 每个单元可以是一个处理器, 每个处 理器可由集成电路实现。 所述装置可位于一个 UE中或 UE的基带处理 器中。
归一化互相关值获取单元 51用于通过 PSS的时域序列与载波频点 的时域信号进行的归一化处理, 获取所述载波频点的信号归一化互相关 值。
其中归一化互相关值获取单元 51 , 具体还包括:
计算子单元 51 1 ,用于计算用户设备 UE第 i个接收天线对应的所述
PSS 的时域序列与载波频点的时域信号的每个采样点的互相关数值 和所述每个采样点的功率数值1^ , d 为所述载波频点的时域信 号的采样点编号。 归一化互相关值确定子单元 512 , 用于计算所述每个采样点的相关
值
,其中 /为所述 UE具有的接收天线的个数, 将所述每个采样点的相关值 C d,Nf 中的最大值作为所述载波频点的 信号归一化互相关值。 检测单元 52 用于检测所述载波频点的信号归一化互相关值是否大 于预设的归一化互相关门限值。
初始搜索单元 53 用于当所述载波频点的信号归一化互相关值大于 所述归一化互相关门限值时, 对所述载波频点进行初始搜索。
进一步的,计算子单元还可以是用于针对多个 PSS的时域序列中的 每个 PSS的时域序列, 分别计算 UE第 i个接收天线所对应的所述 PSS 的时域序列与载波频点的时域信号的每个采样点的互相关数值 X人 d、和
所述每个采样点的功率数值 Y人 d ; d为所述载波频点的时域信号的采样 点编号; 归一化互相关值确定子单元, 用于计算针对每个 PSS的时域序 列的所述每个采样点的相关值^^^,^^ ^^^ / ^) , 其中 /为所述
UE具有的接收天线个数, 将针对所述每个 PSS的时域序列的所述每个 采样点的相关值 c dO中的最大值作为所述载波频点的信号归一化 互相关值。 本发明实施例提供的通信系统频段搜索装置, 采用归一化互相关值 获取单元 51的计算子单元 51 1和归一化互相关值确定子单元 512 ,获取 载波频点的归一化互相关值, 根据载波频点的归一化互相关值与预设的 归一化互相关门限值大小判断, 筛除部分异系统信号, 减少了 UE进行 初始搜索的时间和次数。
实施例五
本发明实施例还提供了一种通信系统频段搜索的装置, 本实施例 以 LTE 系统为例来说明, 如图六所示, 包括归一化互相关值获取单元 61、 第一频点排序单元 65、 检测单元 62、 初始搜索单元 63。
归一化互相关值获取单元 61 , 用于通过 PSS 的时域序列与载波频 点的时域信号进行的归一化处理, 获取所述载波频点的信号归一化互相 关值。
第一频点排序单元 65 ,对系统频段的多个载波频点的信号归一化互 相关值按照由大到小的顺序进行排序, 获取所述载波频点的第一频点排 序。
检测单元 62 ,用于按照第一频点排序检测所述载波频点的信号归一 化互相关值是否大于预设的归一化互相关门限值。
初始搜索单元 63 ,用于当所述载波频点的信号归一化互相关值大于
所述归一化互相关门限值时, 对所述载波频点进行初始搜索。 进一步的, 本发明实施例提供的 LTE系统频段搜索的另一种装置, 如图 7所示, 还可以包括: 功率测量单元 66, 用于测量所在频段内所有 所述载波频点信号的功率; 和第二频点排序单元 67 , 对多个载波频点的 信号功率按照由大到小的顺序进行排序, 获取所述多个载波频点的第二 频点排序。 这样当所述载波频点的信号归一化互相关值不大于所述归一 化互相关门限值时, 或所述载波频点未搜索到 LTE小区, 或不能对搜索 到的 LTE小区进行驻留时,检测单元按照所述第二频点排序检测所述下 一个载波频点的信号归一化互相关值是否大于预设的归一化互相关门 限值。 当然, 检测所述载波频点信号的功率大小并执行排序也可在获取 所述载波频点的信号归一化互相关值之后进行。
本发明实施例提供的通信系统频段搜索装置, 获取载波频点的归一 化互相关值, 对所有载波频点的信号归一化互相关值数值大小进行排 序, 优先检测归一化互相关值大的载波频点, 这样可进一步缩短 UE初 始搜索的时间和次数。
本发明实施例提供的 LTE频段搜索装置可以位于 LTE无线接收机, 如 LTE基带处理器中。可以理解,本实施例提供的方法不仅适用于 LTE 系统,也可应用于其它具有小区搜索功能的通信系统,例如 PLMN系统。
进一步的,本发明实施例提供的 LTE系统频段搜索的方法也可以用 于 PLMN ( Public Land Mobile network, 公共陆地移动网络 ) 的全频段 搜索。 当该载波频点的归一化互相关值不大于预设的归一化互相关门限 值, 不对此载波频点进行初始搜索。 这样可以缩短 PLMN的全频段搜索 时间。
本领域普通技术人员可以理解: 实现上述方法实施例的全部或部分步 骤可以通过程序指令相关的硬件来完成,前述的程序可以存储于一计算机可 读取存储介质中, 该程序在执行时, 执行包括上述方法实施例的步骤; 而前 述的存储介质包括: ROM、 RAM, 磁碟或者光盘等各种可以存储程序代码 的介质。
以上所述, 仅为本发明的具体实施方式, 但本发明的保护范围并不 局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内, 可轻易想到变化或替换, 都应涵盖在本发明的保护范围之内。 因此, 本 发明的保护范围应以所述权利要求的保护范围为准。
Claims
1、 一种通信系统频段搜索的方法, 其特征在于, 包括:
通过对主同步信号 PSS 的时域序列与载波频点的时域信号进行的归 一化处理, 获取所述载波频点的信号归一化互相关值;
检测所述载波频点的信号归一化互相关值是否大于预设的归一化互 相关门限值;
当所述载波频点的信号归一化互相关值大于所述归一化互相关门限 值时, 对所述载波频点进行初始搜索。
2、 根据权利要求 1 所述的方法, 其特征在于, 所述通过对主同步信 号 PSS的时域序列与载波频点的时域信号进行的归一化处理,获取所述载 波频点的信号归一化互相关值包括:
计算用户设备 UE第 i个接收天线对应的所述 PSS的时域序列与载波 频点的时域信号的每个采样点的互相关数值 X d 和所述每个采样点的功 率数值 Y'W , d为所述载波频点的时域信号的采样点编号;
1-1 计算所述每个采样点的相关值^^^,^^ '^ ,其中 为所 述 UE 具有的接收天线的个数, 将所述每个采样点的相关值 ^^(^ Α^ )中 的最大值作为所述载波频点的信号归一化互相关值。
3、 根据权利要求 1 所述的方法, 其特征在于, 所述通过对主同步信 号 PSS的时域序列与载波频点的时域信号进行的归一化处理,获取所述载 波频点的信号归一化互相关值包括: 针对多个 PSS的时域序列中的每个 PSS的时域序列,分别计算 UE第 i个接收天线所对应的所述 PSS的时域序列与载波频点的时域信号的每个 采样点的互相关数值 X,.(c )和所述每个采样点的功率数值 ; d为所述 载波频点的时域信号的采样点编号; 计算针对每个 PSS 的时域序列的所述每个采样点的相关值
€οττ(ά,Ν^) =∑Χ^) / Y^d) , 其中 /为所述 UE具有的接收天线个数, 将针 对所述每个 PSS的时域序列的所述每个采样点的相关值 C T^ A^ )中的最 大值作为所述载波频点的信号归一化互相关值。
4、 根据权利要求 1至 3中任一项所述的方法, 其特征在于, 还包括: 当所述载波频点的信号归一化互相关值不大于所述归一化互相关门 限值时, 或在所述载波频点未搜索到 LTE 小区, 或不能对搜索到的 LTE 小区进行驻留时, 获取另一个载波频点的时域信号, 并对所述另一个载波 频点的时域信号执行所述方法。
5、 根据权利要求 1至 4任一所述的方法, 其特征在于, 还包括: 对系统频段的多个载波频点的信号归一化互相关值按照由大到小的 顺序进行排序, 获取所述载波频点的第一频点排序;
所述检测所述载波频点的信号归一化互相关值是否大于预设的归一 化互相关门限值包括: 按照第一频点排序检测所述载波频点的归一化互相 关值是否大于预设的归一化互相关值。
6、 根据权利要求 1至 4中任一所述的方法, 其特征在于, 还包括: 测量系统频段的多个载波频点的信号功率, 对多个载波频, 的信号功 率按照由大到小的顺序进行排序, 获取所述载波频点的第二频点排序; 所述检测所述载波频点的信号归一化互相关值是否大于预设的归一 化互相关门限值包括: 按照第二频点排序检测所述载波频点的归一化互相 关值是否大于预设的归一化互相关值。
7、 一种通信系统频段搜索的装置, 其特征在于, 包括: 归一化互相关值获取单元,用于通过主同步信号 PSS的时域序列与载 波频点的时域信号进行的归一化处理, 获取所述载波频点的信号归一化互 相关值;
检测单元, 用于检测所述载波频点的信号归一化互相关值是否大于预 设的归一化互相关门限值;
初始搜索单元, 用于当所述载波频点的信号归一化互相关值大于所述 归一化互相关门限值时, 对所述载波频点进行初始搜索。
8、 根据权利要求 7 所述的装置, 其特征在于, 所述归一化互相关值 获取单元, 包括: 计算子单元和归一化互相关值确定子单元;
所述计算子单元, 用于计算用户设备 UE第 i个接收天线对应的所述
PSS 的时域序列与载波频点的时域信号的每个采样点的互相关数值 xAd、 和所述每个采样点的功率数值 ( , d为所述载波频点的时域信号的采样 点编号; 所述归一化互相关值确定子单元, 用于计算所述每个采样点的相
,其中 /为所述 UE具有的接收天线的个数, 将所述每个采样点的相关值 ^^( )中的最大值作为所述载波频点的信 号归一化互相关值; 或者所述计算子单元, 用于针对多个 PSS 的时域序列中的每个 PSS 的时域序列 , 分别计算 UE第 i个接收天线所对应的所述 PSS的时域序列 与载波频点的时域信号的每个采样点的互相关数值 X T)和所述每个采样 点的功率数值 d为所述载波频点的时域信号的采样点编号; 所 述归一化互相关值确定子单元,用于计算针对每个 PSS的时域序列的所述 每个采样点的相关值 Corr{d ,Ν^^ Χ I Y , {0、, 其中 /为所述 UE具有的
/=0 接收天线个数,将针对所述每个 PSS的时域序列的所述每个采样点的相关 值 C d'N^中的最大值作为所述载波频点的信号归一化互相关值。
9、 根据权利要求 7或 8所述的装置, 其特征在于, 还包括: 第一频点排序单元, 对系统频段的多个载波频点的信号归一化互相关 值按照由大到小的顺序进行排序, 获取所述载波频点的第一频点排序; 所述检测单元, 用于按照第一频点排序检测所述载波频点的归一化互 相关值是否大于预设的归一化互相关值。
10、 根据权利要求 7或 8所述的装置, 其特征在于, 还包括: 功率测量单元, 用于测量所在频段所有载波频点信号的功率; 第二频点排序单元, 对多个载波频点的信号功率按照由大到小的顺序 进行排序, 获取所述多个载波频点的第二频点排序;
所述检测单元, 用于按照第二频点排序检测所述载波频点的归一化互 相关值是否大于预设的归一化互相关值。
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