WO2012068853A1 - 一种wcdma小区搜索方法及装置 - Google Patents

一种wcdma小区搜索方法及装置 Download PDF

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Publication number
WO2012068853A1
WO2012068853A1 PCT/CN2011/074994 CN2011074994W WO2012068853A1 WO 2012068853 A1 WO2012068853 A1 WO 2012068853A1 CN 2011074994 W CN2011074994 W CN 2011074994W WO 2012068853 A1 WO2012068853 A1 WO 2012068853A1
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Prior art keywords
frequency
point
sweep
search
frequency point
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PCT/CN2011/074994
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English (en)
French (fr)
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吴更石
林森凌
杨靖
郭晶
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华为终端有限公司
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Publication of WO2012068853A1 publication Critical patent/WO2012068853A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/7073Synchronisation aspects
    • H04B1/7083Cell search, e.g. using a three-step approach

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a WCDMA (Wideband Code Division Multiple Access) cell search method and apparatus.
  • WCDMA Wideband Code Division Multiple Access
  • a WCDMA system in order to obtain the services of the network, the UE needs to find the network and initiate registration.
  • the process by which a UE looks for a network is called a cell search.
  • the cell search physical information such as the frequency point of the corresponding cell and the scrambling code number needs to be found, and the broadcast information of the cell is used to determine whether the cell is available.
  • the existing cell search technology is to first perform RSSI (Received Signal Strength Indicator) scanning for each frequency point, sort the frequency points according to the RSSI value, and then follow the RSSI value from high to low. A three-step search is performed for each frequency point.
  • RSSI Receiveived Signal Strength Indicator
  • the so-called three-step method means that the first step is to find the slot header of the WCDMA signal through the PSCH (Primary Synchronization Code Channel), and the second step is to find the frame header and the interference of the WCDMA signal through the SSCH (Secondary Synchronisation Channel).
  • the code group number is to find the scrambling code number of the WCDMA signal through the CPICH (Common Pilot Channel).
  • the search is unsuccessful in any step, the three-step search of the next frequency point is started, and only the frequency of the three-step search is the WCDMA frequency.
  • the inventors have found that although the prior art can ensure that the cell will not be missed, the search time will be longer; in order to shorten the search time, only the top N frequency points of the RSSI value are selected.
  • Cell search which in turn results in a strong SI (Global System for Mobile Communications) frequency band, possibly at the RS SI value
  • the top N frequency points are all GSM frequency points, which makes it impossible to search for a WCDMA frequency point, that is, the search network fails, and the user cannot select the cell camp.
  • the embodiment of the invention provides a WCDMA cell search method and device, which can shorten the search time under the premise of ensuring that the cell does not leak as much as possible.
  • a WCDMA cell search method includes:
  • a WCDMA cell search device includes:
  • a coarse sweeping unit for performing rough sweeping in a given frequency band according to a set step
  • a fine sweeping unit for finely sweeping each frequency point through the rough sweep
  • a frequency sweeping unit for performing a 5M doubling sweep on the frequency of the fine sweep
  • a recording unit for recording the frequency and frequency band number of the search success.
  • the coarse sweep, the fine sweep, and the 5M frequency sweep are sequentially used, so that the search speed can be improved, and the search can be shortened under the premise of ensuring that the cell is not leaked as much as possible. Net time.
  • FIG. 1 is a schematic flowchart of a WCDMA cell search method according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a WCDMA cell search device according to an embodiment of the present invention
  • Schematic detailed description The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings.
  • a WCDMA cell search method provided by an embodiment of the present invention includes:
  • the coarse sweeping method is: extracting the coarse sweep frequency point according to the set step in a given frequency band, comparing the RSSI value of the coarse sweep frequency point with the set threshold value, and removing the less than the set threshold value.
  • the frequency point, and the frequency point exceeding the set threshold value is recorded as the frequency point through the coarse sweep. This is because if the frequency is less than the set RSSI threshold, the signal is considered too weak, and these frequencies may not be processed later, in order to shorten the search time.
  • the set step is preferably 3M, because the coarse sweep is performed every 3M, so that the RSSI value is relatively smoother than the interval 5M, which is convenient for determining the coarse sweep threshold. It should be noted that the present invention does not limit the stepping of the rough sweep, and is only configured as a parameter, and other steps other than 3M, such as 4M, 3.5M, etc., can be selected.
  • the method of fine sweeping is to sequentially select a frequency point through the coarse sweep, and take all the frequency points in the range of 1.5M and 3M in the range of the selected frequency point to perform PSCH correlation value sorting, and the frequency with the largest correlation value of the PSCH.
  • the point is searched in the next two steps of the above three-step method, that is, the frequency point with the largest PSCH correlation value is only searched in the following two steps: searching for the frame header and scrambling code group number of the WCDMA signal through the SSCH, and searching for the WCDMA signal through the CPICH. Scrambling code number.
  • any step of the above two-step search is unsuccessful, it will exit directly, so as to exit the frequency search in time, and select the next frequency to be processed by the coarse sweep. If the above two-step search is passed, that is, the scrambling code number of the WCDMA signal is searched, the frequency point is regarded as the frequency point of the search success, and the frequency point is recorded as the frequency point through the fine sweep.
  • the number contains the primary synchronization channel PSCH of a specific sequence, but there is no such sequence in the GSM signal, so this sequence can be used to distinguish between the WCDMA signal and the GSM signal.
  • the present invention can search only the frequency point with the largest PSCH correlation value, so as to shorten the search time.
  • the method of doubling sweep is to acquire all unsearched 5M doubling points of the frequency of the fine sweep in a given frequency band, and delete the 4M range from the obtained 5M doubling point to the left and right of the effective historical frequency.
  • the frequency of the PSCH is selected in the unremoved 5M doubling point, and a certain number of frequency points are taken in the vicinity of the selected 5M doubling point to perform PSCH correlation value sorting, and the PSCH correlation value is used.
  • the maximum frequency point is searched for the next two steps of the above three-step method, that is, the frame header and the scrambling code group number of the WCDMA signal are first searched through the SSCH, and then the scrambling code number of the WCDMA signal is searched through the CPICH.
  • any step of the above two-step search is unsuccessful, it will exit directly, so that the frequency search can be exited in time, and the next 5M multiplication point is selected for processing. If the above two-step search is passed, that is, the scrambling code number of the WCDMA signal is searched, the frequency point is considered to be the frequency of the search success.
  • the WCDMA transmit signal bandwidth is about 5M
  • the operator network will set the effective frequency point at the adjacent interval 5M frequency. Therefore, there is a probability that there is an effective frequency point near the 5M multiplication point of each effective frequency point. high.
  • the search speed will be further improved.
  • the two frequency points and the multiplication point itself are taken at a frequency of 200 khz for a total of five frequency points.
  • the PSCH correlation value is sorted for a certain number of frequency points near each 5M frequency doubling point, and only the frequency point with the largest PSCH correlation value is searched, which is also because the WCDMA signal includes a PSCH of a specific sequence composition, but the GSM signal is included. There is no such sequence, so this sequence can be used to distinguish WCDMA signals from GSM signals in order to shorten the search time.
  • Embodiments of the present invention may further include the step of searching for historical frequency points. This step can be performed before the step S12 of the embodiment of the present invention, because the historical frequency point is the frequency at which the cell is highly probable, and it is necessary to perform the search first. The strongest dwellable WCDMA frequency can be quickly found by searching the historical frequency.
  • the method of searching for historical frequency points is to adopt a three-step method: the first step is to find the slot header of the WCDMA signal through the PSCH, and the second step is to find the frame header and the scrambling code group number of the WCDMA signal through the SSCH, and the third step is to pass the CPICH. Look for the scrambling code number of the WCDMA signal. If the above three-step search is successful, that is, the scrambling code number of the WCDMA signal is searched, the historical frequency point is regarded as the frequency of the search success, and the historical frequency point is recorded as the effective historical frequency point.
  • Table 1 is comparative data using the solution of the embodiment of the present invention and the time of searching for the network without using the embodiment of the present invention. Table 1 :
  • FIG. 2 is a WCDMA cell search apparatus according to an embodiment of the present invention, including: a coarse sweeping unit 22, configured to perform coarse sweeping according to a set step in a given frequency band;
  • a fine sweeping unit 23 for finely sweeping each frequency point through the rough sweep
  • the frequency sweeping unit 24 is configured to perform a 5M frequency sweep on the frequency of the fine sweep
  • the recording unit 25 is configured to record the frequency and frequency band number of the search success.
  • the WCDMA cell search apparatus may further include: a historical frequency point searching unit, configured to sequentially search for a time slot header, a frame header, a scrambling code group number, and a scrambling code number of the WCDMA signal for the historical frequency point, if the search is The scrambling code number of the WCDMA signal is the frequency point of the search success, and the historical frequency point is recorded as the effective historical frequency point, and the recording unit 25 records the frequency and frequency band number of the search success.
  • a historical frequency point searching unit configured to sequentially search for a time slot header, a frame header, a scrambling code group number, and a scrambling code number of the WCDMA signal for the historical frequency point, if the search is The scrambling code number of the WCDMA signal is the frequency point of the search success, and the historical frequency point is recorded as the effective historical frequency point, and the recording unit 25 records the frequency and frequency band number of the search success.
  • the rough sweeping unit 22 may include:
  • the extraction module 221 is configured to extract a coarse sweep point according to a set step in a given frequency band; preferably, the set step is 3M.
  • the comparison module 222 is configured to compare the RSSI value of the coarse sweep point extracted by the extraction module 221 with the set RSSI threshold, and record the frequency exceeding the set RSSI threshold as the frequency of the coarse sweep. point.
  • the fine sweeping unit 23 can include:
  • the first selecting module 231 is configured to sequentially select a frequency point that passes through the coarse sweeping
  • the first sorting module 232 is configured to perform all the frequency points in the range of 1.5M and 3M in the frequency range selected by the first selecting module 231 to perform PSCH correlation value sorting;
  • the first search module 233 is configured to perform a three-step search of the last two steps of the frequency point with the largest PSCH correlation value obtained by the first sorting module. That is, the frequency point with the largest correlation value of the PSCH is sequentially searched for the frame header and the scrambling code group number of the WCDMA signal through the SSCH, and the scrambling code number of the WCDMA signal is searched through the CPICH. If the scrambling code number of the WCDMA signal is searched, the frequency point is the frequency point of the search success, the frequency point is recorded as the frequency point through the fine sweep, and the frequency and the frequency band number of the search success are transferred by the recording unit 25. recording.
  • the first sorting module 232 performs PSCH correlation value sorting on all frequency points in the range of 3M around each frequency point of the coarse sweep, and the first search module 233 searches only the frequency point with the largest PSCH correlation value.
  • the WCDMA signal contains the primary synchronization channel PSCH of a specific sequence, but there is no such sequence in the GSM signal, so this sequence can be used to distinguish the WCDMA signal from the GSM signal.
  • the fine sweep unit 23 of the present embodiment can search only the frequency point with the largest PSCH correlation value, so as to shorten the search time.
  • the frequency doubling unit 24 can include:
  • the obtaining module 241 is configured to acquire all unsearched 5M multiplication points of the frequency points that are passed through the fine sweep in a given frequency band;
  • the deleting module 242 is configured to delete, from the 5M frequency multiplication point acquired by the acquiring module 241, a frequency point falling within a range of 4M around the effective historical frequency point, and the remaining one is recorded as a candidate 5M multiplication point;
  • a second selecting module 243 configured to sequentially select a 5M multiplier point from the candidate 5M multiplier point
  • the second sorting module 244 is configured to perform a PSCH correlation value sorting by taking a certain number of frequency points in the vicinity of the 5M frequency doubling point selected by the second selecting module 243;
  • the second search module 245 is configured to perform a three-step search of the next two steps of the frequency point with the largest PSCH correlation value obtained by the second sorting module 244. That is, the frequency point at which the PSCH correlation value is the largest is sequentially searched for the frame header and the scrambling code group number of the WCDMA signal through the SSCH, and the scrambling code number of the WCDMA signal is searched through the CPICH. If the above two-step search is successful, that is, the scrambling code number of the WCDMA signal is searched, the frequency point is the frequency of the search success, and the recording unit 25 records the frequency and frequency band number of the search success.
  • the deletion module 242 deletes the frequency points falling within the range of 4M around the effective historical frequency from the acquired 5M multiplication point, and performs subsequent search only on the remaining candidate 5M multiplication points. This is because the spectrum bandwidth of the WCDMA signal is 5M. In order not to overlap the frequency, the distance between the two frequencies is at least about 5M, so it is definitely impossible to have a frequency in the range of 4M around the effective historical frequency. Deleting these frequency points does not perform subsequent searches, thereby achieving the purpose of shortening the search time.
  • the PSCH correlation value is sorted by the second sorting module 244 for a certain number of frequency points in the vicinity of each valid 5M multiplication point, and the second search module 245 searches only the frequency point with the largest PSCH correlation value, which is also Because the WCDMA signal contains a PSCH of a specific sequence, but there is no such sequence in the GSM signal, this sequence can be used to distinguish the WCDMA signal from the GSM signal to achieve the purpose of shortening the search time.
  • the WCDMA cell search apparatus of the embodiment of the present invention may further include: a threshold adjustment unit 30, configured to adjust a set RSSI threshold.
  • the WCDMA cell search method and device provided by the embodiment of the present invention utilizes the characteristics of the WCDMA signal itself, and adopts a coarse sweep, a fine sweep, and a 5M frequency sweeping method in sequence; the RSSI physical quantity is used in the rough sweep, and only the RSSI gate is exceeded.
  • the frequency of the limit is subjected to subsequent processing; when performing the fine sweep and the 5M doubling sweep, using the PSCH channel composed of the specific sequence included in the WCDMA signal, only the frequency point with the largest PSCH correlation value is searched to distinguish the WCDMA signal and GSM signal; When the 5M doubling sweep is performed, the frequency points falling within the range of 4M around the effective historical frequency are deleted from the acquired 5M doubling point, thereby achieving the purpose of shortening the search time, and ensuring that the cell is not leaked as much as possible.

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Description

一种 WCDMA小区搜索方法及装置
本申请要求于 2010 年 11 月 27 曰提交中国专利局、 申请号为 201010563506. 5. 发明名称为 "一种 WCDMA小区搜索方法及装置" 的中 国专利申请的优先权, 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及无线通信技术领域, 尤其涉及一种 WCDMA (Wideband Code Division Multiple Access, 宽带码分多址) 小区搜索方法及装置。
背景技术
在 WCDMA 系统中, UE为了获得网络的服务, 需要先找到网络并发起 注册。 UE寻找网络的过程称为小区搜索。 在小区搜索中需要找到对应小区的 频点以及扰码号等物理信息, 并通过解该小区的广播信息来判断该小区是否 可用。
现有的小区搜索技术是, 首先对每个频点进行 RSSI ( Received Signal Strength Indicator, 接收信号强度指示)扫描, 根据 RSSI值的大小对频点进行 排序, 然后再按照 RSSI值从高到低对每个频点进行三步法搜索。
所谓三步法是指, 第一步通过 PSCH ( Primary Synchronization Code Channel 主同步信道) 寻找 WCDMA 信号的时隙头, 第二步通过 SSCH (Secondary Synchronisation Channel辅同步信道 )寻找 WCDMA信号的帧头 和扰码组号, 第三步是通过 CPICH (Common Pilot Channel, 公共导频信道) 寻找 WCDMA信号的扰码号。上述三步法搜索中,任一步搜索不成功则退出, 开始下一个频点的三步法搜索, 只有三步搜索都成功的频点才为 WCDMA频 点。
在实现本发明的过程中发明人发现, 现有技术虽然能够保证不会漏掉小 区, 但是搜网时间会较长; 为了缩短搜网时间, 若仅选择 RSSI值排名前 N个 的频点进行小区搜索, 这又会造成在存在较强的 GSM (Global System for Mobile Communications, 全球移动通讯系统)频点的频段内, 可能在 RS SI值 排名前 N个的频点均为 GSM频点, 导致无法搜索到一个 WCDMA频点, 即 搜网失败, 用户无法选择小区驻留。
发明内容
本发明实施例提供了一种 WCDMA小区搜索方法及装置 , 能够在保证尽 量不漏小区的前提下, 缩短搜网时间。
本发明实施例釆用如下技术方案:
一种 WCDMA小区搜索方法, 包括:
在给定频段内按照设定的步进进行粗扫;
对通过粗扫的每个频点进行细扫;
对通过细扫的频点进行 5M倍频扫;
对搜索成功的频点和频段号进行记录。
一种 WCDMA小区搜索装置, 包括:
粗扫单元, 用于在给定频段内按照设定的步进进行粗扫;
细扫单元, 用于对通过粗扫的每个频点进行细扫;
倍频扫单元, 用于对通过细扫的频点进行 5M倍频扫;
记录单元, 用于对搜索成功的频点和频段号进行记录。
由本发明实施例的技术方案可知, 通过利用 WCDMA信号自身的特性, 依次采用粗扫、 细扫和 5M倍频扫的方式, 可以提高搜网速度, 在保证尽量不 漏小区的前提下, 缩短搜网时间。
附图说明
为了更清楚地说明本发明实施例的技术方案, 下面将对实施例描述中所 需要使用的附图作一简单地介绍。
图 1为本发明实施例的 WCDMA小区搜索方法的流程示意图; 图 2为本发明的 WCDMA小区搜索装置的一实施方式的结构示意图; 图 3为本发明的 WCDMA小区搜索装置的另一实施方式的结构示意图。 具体实施方式 下面结合本附图, 对本发明实施例中的技术方案进行清楚、 完整地描述。 参见图 1, 本发明实施例提供的 WCDMA小区搜索方法, 包括:
512, 在给定频段内按照设定的步进进行粗扫。
粗扫的方式是, 在给定频段内按照设定的步进抽取粗扫频点, 将所述粗 扫频点的 RSSI值与设定门限值进行比较, 去掉小于设定门限值的频点, 并将 超过设定门限值的频点记为通过粗扫的频点。 这是因为对小于设定 RSSI门限 值的频点, 则认为信号太弱, 可以不对这些频点进行后续处理, 以期达到缩 短搜网时间的目的。
设定的步进优选为 3M, 这是因为每隔 3M进行粗扫, 使得 RSSI值比间 隔 5M相对平稳些, 这样便于确定粗扫门限。 需要说明的是, 本发明对粗扫的 步进并不做限制, 仅作为参数进行配置, 可以选取 3M以外的其他步进, 例如 4M、 3.5M等等。
513 , 对通过粗扫的每个频点进行细扫。
细扫的方式是, 依次选取通过粗扫的一个频点, 取所述选取的频点左右 各 1.5M共 3M范围内的所有频点进行 PSCH相关值排序, 对所述 PSCH相关 值最大的频点进行上述三步法后面两步的搜索, 即对该 PSCH相关值最大的 频点只进行如下两步搜索:通过 SSCH寻找 WCDMA信号的帧头和扰码组号, 以及通过 CPICH寻找 WCDMA信号的扰码号。
上述两步搜索的任何一步不成功则直接退出, 以便及时退出该频点搜索, 选取下一个通过粗扫的频点进行处理。 如果通过了上述两步搜索, 即搜索到 WCDMA信号的扰码号, 则认为该频点为搜索成功的频点, 并且将该频点记 为通过细扫的频点。
可以理解的是, 由于频点只可能在 200khz的整数倍上, 所以在每个通过 粗扫的频点的左右各 1.5M共 3M范围内共有 15个频点。
之所以对通过粗扫的每个频点左右共 3M范围内的所有频点进行 PSCH相 关值排序, 且仅对 PSCH相关值最大的频点进行搜索, 这是因为 WCDMA信 号中包含特定序列组成的主同步信道 PSCH,但 GSM信号中没有这样的序列, 因此可以利用这个序列来区分 WCDMA信号和 GSM信号。 与现有技术中仅 仅利用 RSSI信号强度相比, 本发明可以仅对 PSCH相关值最大的频点进行搜 索, 以达到缩短搜网时间的目的。
S 14, 对通过细扫的频点进行 5M倍频扫。
倍频扫的方式是, 在给定频段内获取通过细扫的频点的所有未搜索过的 5M倍频点, 从所述获取的 5M倍频点中删除落入有效历史频点左右 4M范围 内的频点; 在未删除的 5M倍频点中依次选取一个 5M倍频点, 在所述选取的 5M倍频点附近取一定数目的频点进行 PSCH相关值排序,对所述 PSCH相关 值最大的频点进行上述三步法后面两步的搜索, 即首先通过 SSCH 寻找 WCDMA信号的帧头和扰码组号, 然后通过 CPICH寻找 WCDMA信号的扰 码号。
上述两步搜索的任何一步不成功则直接退出, 以便及时退出该频点搜索, 选取下一个 5M 倍频点进行处理。 如果通过了上述两步搜索, 即搜索到 WCDMA信号的扰码号, 则认为该频点为搜索成功的频点。
一般来讲, WCDMA发射信号带宽约为 5M, 运营商布网会在相邻间隔 5M频点设置有效频点, 所以在每个有效频点的 5M倍频点附近存在有效频点 的的概率艮高。通过对每个通过细扫的有效频点进行 5M倍频扫,作为细扫的 补充机制, 将会使搜索速度得到更大的提高。
例如, 通过细扫的频点记为 F0, 那么如下的频点 Fc则为可能性非常高的 频点: Fc = F0 + 5 MHz * n + 200 kHz * k; n=..., -2,-1,0,1,2,...; k=..., -2,-1,0,1,2,· · ·; 其中, 5M为 WCDMA信号的频带带宽, 200khz为搜索 的频点间隔。
由公式 F0 + 5 MHz * n , n=...,-2,-l,0, l,2,..., 在给定频段内选取出 F0的 所有 5M倍频点, 并去掉已经搜索过的 5M倍频点。 然后, 从获取的 5M倍频 点中删除落入有效历史频点左右 4M范围内的频点,余下的作为本次倍频扫的 候选 5M倍频点。 这是因为 WCDMA信号的频谱带宽为 5M, 为了不出现频 语重叠, 布网时两个频点的距离至少 5M左右, 所以在有效历史频点左右 4M 范围内肯定不可能出现频点, 所以删除这些频点不进行后续搜索, 从而达到 缩短搜网时间的目的。
对每个候选 5M倍频点, 在该 5M倍频点附近取一定数目的频点, 具体是 由公式 Fc = F0 + 5 MHz * n + 200 kHz * k, k值可配置,可取 -3,-2,- 1,0, 1,2,3等。 例如当 k值取 -2,- 1,0, 1,2时,则以 200khz的间隔取倍频点左右各两个和倍频点 自身共五个频点。
对每个 5M倍频点附近的一定数目的频点进行 PSCH相关值排序,并仅对 PSCH相关值最大的频点进行搜索 , 这也是因为 WCDMA信号中包含特定序 列组成的 PSCH, 但 GSM信号中没有这样的序列, 因此可以利用这个序列来 区分 WCDMA信号和 GSM信号, 以达到缩短搜网时间的目的。
S 15 , 对搜索成功的频点和频段号进行记录。 对本发明实施例的方法说明有如下两点:
( 1 )本发明实施例还可以包括对历史频点搜索的步骤。 该步骤可以在本 发明实施例的 S12步驟之前进行, 这是因为历史频点是高概率存在小区的频 点, 有必要先进行搜索。 通过对历史频点搜索可以迅速找到最强的可驻留的 WCDMA频点。
对历史频点搜索的方式是,采用三步法:第一步通过 PSCH寻找 WCDMA 信号的时隙头, 第二步通过 SSCH寻找 WCDMA信号的帧头和扰码组号, 第 三步是通过 CPICH寻找 WCDMA信号的扰码号。 如果上述三步搜索都成功 , 即搜索到 WCDMA信号的扰码号, 则认为该历史频点为搜索成功的频点, 并 且将该历史频点记为有效历史频点。
( 2 )在搜索完所有频段后, 若都未找到成功的频点, 说明在进行粗扫时 设定的 RSSI门限值可能较高, 此时应降低粗扫的门限对未曾做过处理的粗扫 频点进一步处理, 以保证尽量不漏小区。 参见表 1 ,表 1是采用本发明实施例方案与未采用本发明实施例方案搜网 时间的对比数据。 表 1 :
Figure imgf000008_0001
由上述对比数据可知, 通过采用本发明实施例提供的 WCDMA小区搜索 方法, 能够在保证尽量不漏小区的前提下, 大大提高了搜网速度。 参见图 2, 图 2为本发明实施例提供的 WCDMA小区搜索装置, 包括: 粗扫单元 22, 用于在给定频段内按照设定的步进进行粗扫;
细扫单元 23 , 用于对通过粗扫的每个频点进行细扫;
倍频扫单元 24, 用于对通过细扫的频点进行 5M倍频扫;
记录单元 25 , 用于记录搜索成功的频点和频段号。
进一步地,所述 WCDMA小区搜索装置还可以包括: 历史频点搜索单元, 用于对历史频点依次搜索 WCDMA信号的时隙头、 帧头和扰码组号、 以及扰 码号,如果搜索到 WCDMA信号的扰码号,则该历史频点为搜索成功的频点, 将该历史频点记为有效历史频点, 并且转由记录单元 25对搜索成功的频点和 频段号进行记录。
进一步地, 参见图 3 , 其中, 粗扫单元 22可以包括:
抽取模块 221 ,用于在给定频段内按照设定的步进抽取粗扫频点;优选地, 设定的步进为 3M。
比较模块 222, 用于将所述抽取模块 221抽取的粗扫频点的 RSSI值与设 定 RSSI门限值进行比较, 并将超过设定 RSSI门限值的频点记为通过粗扫的 频点。 其中, 细扫单元 23可以包括:
第一选取模块 231, 用于依次选取一个通过粗扫的频点;
第一排序模块 232,用于取所述第一选取模块 231选取的频点左右各 1.5M 共 3M范围内的所有频点进行 PSCH相关值排序;
第一搜索模块 233,用于对所述第一排序模块得到的 PSCH相关值最大的 频点进行三步法后面两步的搜索。 即对该 PSCH相关值最大的频点依次通过 SSCH寻找 WCDMA信号的帧头和扰码组号,以及通过 CPICH寻找 WCDMA 信号的扰码号。 如果搜索到 WCDMA信号的扰码号, 则该频点为搜索成功的 频点, 将该频点记为通过细扫的频点, 并且转由记录单元 25对搜索成功的频 点和频段号进行记录。
之所以由第一排序模块 232对通过粗扫的每个频点左右共 3M范围内的所 有频点进行 PSCH相关值排序, 且由第一搜索模块 233仅对 PSCH相关值最 大的频点进行搜索, 这是因为 WCDMA信号中包含特定序列组成的主同步信 道 PSCH, 但 GSM 信号中没有这样的序列, 因此可以利用这个序列来区分 WCDMA信号和 GSM信号。 与现有技术中仅仅利用 RSSI信号强度相比, 本 实施例的细扫单元 23可以仅对 PSCH相关值最大的频点进行搜索, 以达到缩 短搜网时间的目的。
其中, 倍频扫单元 24可以包括:
获取模块 241,用于在给定频段内获取通过细扫的频点的所有未搜索过的 5M倍频点;
删除模块 242, 用于从所述获取模块 241获取的 5M倍频点中删除落入有 效历史频点左右 4M范围内的频点, 余下的记为候选 5M倍频点;
第二选取模块 243, 用于从所述候选 5M倍频点中依次选取一个 5M倍频 点;
第二排序模块 244, 用于在所述第二选取模块 243选取的 5M倍频点附近 取一定数目的频点进行 PSCH相关值排序; 第二搜索模块 245,用于对所迷第二排序模块 244得到的 PSCH相关值最 大的频点进行三步法后面两步的搜索。 即对该 PSCH相关值最大的频点依次 通过 SSCH 寻找 WCDMA信号的帧头和扰码组号, 以及通过 CPICH 寻找 WCDMA信号的扰码号。 如果上述两步搜索都成功, 即搜索到 WCDMA信号 的扰码号, 则该频点为搜索成功的频点, 并转由记录单元 25对搜索成功的频 点和频段号进行记录。
之所以由删除模块 242从获取的 5M倍频点中删除落入有效历史频点左右 4M范围内的频点, 并且仅对余下的候选 5M倍频点进行后续搜索。 这是因为 WCDMA信号的频谱带宽为 5M, 为了不出现频 ΐ普重叠, 布网时两个频点的距 离至少 5M左右, 所以在有效历史频点左右 4M范围内肯定不可能出现频点, 所以删除这些频点不进行后续搜索, 从而达到缩短搜网时间的目的。
之所以由第二排序模块 244对每个有效 5M倍频点附近的一定数目的频点 进行 PSCH相关值排序, 且由第二搜索模块 245仅对 PSCH相关值最大的频 点进行搜索,这也是因为 WCDMA信号中包含特定序列组成的 PSCH,但 GSM 信号中没有这样的序列,因此可以利用这个序列来区分 WCDMA信号和 GSM 信号, 以达到缩短搜网时间的目的。
最后需要说明的是, 若在搜索完所有频段后, 都未找到成功的频点, 说 明在进行粗扫时设定的 RSSI门限值可能较高, 此时应降低粗扫的门限对未曾 做过处理的粗扫频点进一步处理, 以保证尽量不漏小区。
因此, 仍参见图 3 , 本发明实施例的 WCDMA小区搜索装置还可以包括: 门限调整单元 30, 用于对设定 RSSI门限值进行调整。
本发明实施例提供的 WCDMA小区搜索方法和装置,利用了 WCDMA信 号自身的特性, 依次采用粗扫、 细扫和 5M倍频扫的方式; 在进行粗扫时采用 RSSI物理量, 仅对超过 RSSI门限值的频点进行后续处理; 在进行细扫和 5M 倍频扫时, 利用 WCDMA信号中所包含特定序列组成的 PSCH信道, 仅对 PSCH相关值最大的频点进行搜索, 以区分 WCDMA信号和 GSM信号; 另外 在进行 5M倍频扫时,从通过获取的 5M倍频点中删除落入有效历史频点左右 4M范围内的频点, 从而达到了缩短搜网时间的目的, 并且保证了尽量不漏小 区。
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 范围应该以权利要求的保护范围为准。

Claims

权利要求 书
1、 一种 WCDMA小区搜索方法, 其特征在于, 包括:
在给定频段内按照设定的步进进行粗扫;
对通过粗扫的每个频点进行细扫;
对通过细扫的频点进行 5M倍频扫;
对搜索成功的频点和频段号进行记录。
2、 根据权利要求 1所述的方法, 其特征在于, 所述方法还包括: 对历史频 点进行搜索;
所述对历史频点进行搜索包括:
对历史频点依次搜索 WCDMA信号的时隙头、 帧头和扰码组号、 以及扰码 号, 如果搜索到 WCDMA信号的扰码号, 则该历史频点为搜索成功的频点, 并 将该历史频点记为有效历史频点。
3、 根据权利要求 1所述的方法, 其特征在于, 所述在给定频段内按照设定 的步进进行粗扫包括:
在给定频段内按照设定的步进抽取粗扫频点;
将所述粗扫频点的接收信号强度指示 RSSI值与设定 RSSI门限值进行比较; 将超过设定 RSSI门限值的频点记为通过粗扫的频点。
4、 根据权利要求 3所述的方法, 其特征在于, 所述设定的步进为 3M。
5、 根据权利要求 1所述的方法, 其特征在于, 所述对通过粗扫的每个频点 进行细扫包括:
依次选取一个通过粗扫的频点;
取所述选取的频点左右各 1.5M共 3M 范围内的所有频点进行主同步信道 PSCH相关值排序;
对所述 PSCH相关值最大的频点依次搜索 WCDMA信号的帧头和扰码组 号、 以及扰码号, 如果搜索到 WCDMA信号的扰码号, 则该频点为搜索成功的 频点 , 并且将该频点记为通过细扫的频点。
6、 根据权利要求 2所述的方法, 其特征在于, 所述对通过细扫的频点进行 5M倍频扫包括:
在给定频段内获取通过细扫的频点的所有未搜索过的 5M倍频点; 从所述获取的 5M倍频点中删除落入有效历史频点左右 4M范围内的频点, 余下的记为候选 5M倍频点;
从所述候选 5M倍频点中依次选取一个 5M倍频点;
在所述选取的 5M倍频点附近取一定数目的频点进行 PSCH相关值排序; 对所述 PSCH相关值最大的频点依次搜索 WCDMA信号的帧头和扰码组 号、 以及扰码号, 如果搜索到 WCDMA信号的扰码号, 则该频点为搜索成功的 频点。
7、 根据权利要求 1-6任一项所述的方法, 其特征在于, 所述方法还包括: 在搜索完所有频段后若未找到搜索成功的频点, 则降低粗扫设定的 RSSI门 限值, 对未做过处理的粗扫频点进一步处理。
8、 一种 WCDMA小区搜索装置, 其特征在于, 包括:
粗扫单元, 用于在给定频段内按照设定的步进进行粗扫;
细扫单元, 用于对通过粗扫的每个频点进行细扫;
倍频扫单元, 用于对通过细扫的频点进行 5M倍频扫;
记录单元, 用于对搜索成功的频点和频段号进行记录。
9、 根据权利要求 8所述的装置, 其特征在于, 所述装置还包括:
历史频点搜索单元 , 用于对历史频点依次搜索 WCDMA信号的时隙头、 帧 头和扰码组号、 以及扰码号, 如果搜索到 WCDMA信号的扰码号, 则该历史频 点为搜索成功的频点, 并将该历史频点记为有效历史频点。
10、 根据权利要求 8所述的装置, 其特征在于, 所述粗扫单元包括: 抽取模块, 用于在给定频段内按照设定的步进抽取粗扫频点;
比较模块, 用于将所述抽取模块抽取的粗扫频点的 RSSI值与设定 RSSI门 限值进行比较, 并将超过设定 RSSI门限值的频点记为通过粗扫的频点。
11、 根据权利要求 8所述的装置, 其特征在于, 所述细扫单元包括: 第一选取模块, 用于依次选取一个通过粗扫的频点;
第一排序模块, 用于取所述第一选取模块选取的频点左右各 1.5M共 3M范 围内的所有频点进行 PSCH相关值排序;
第一搜索模块, 用于对所述第一排序模块得到的 PSCH相关值最大的频点 依次搜索 WCDMA信号的帧头和扰码组号、 以及扰码号, 如果搜索到 WCDMA 信号的扰码号, 则该频点为搜索成功的频点, 并且将该频点记为通过细扫的频 点。
12、 根据权利要求 9所述的装置, 其特征在于, 所述倍频扫单元包括: 获取模块 ,用于在给定频段内获取通过细扫的频点的所有未搜索过的 5M倍 频点;
删除模块,用于从所述获取模块获取的 5M倍频点中删除落入有效历史频点 左右 4M范围内的频点, 余下的记为候选 5M倍频点;
第二选取模块, 用于从所述候选 5M倍频点中依次选取一个 5M倍频点; 第二排序模块,用于在所述第二选取模块选取的 5M倍频点附近取一定数目 的频点进行 PSCH相关值排序;
第二搜索模块, 用于对所述第二排序模块得到的 PSCH相关值最大的频点 依次搜索 WCDMA信号的帧头和扰码组号、 以及扰码号, 如果搜索到 WCDMA 信号的扰码号, 则该频点为搜索成功的频点。
13、 根据权利要求 8-12任一项所述的装置, 其特征在于, 所述装置还包括: 门限调整单元, 用于对设定 RSSI门限值进行调整。
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