WO2015139417A1 - 一种终端自动找网方法及装置 - Google Patents

一种终端自动找网方法及装置 Download PDF

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Publication number
WO2015139417A1
WO2015139417A1 PCT/CN2014/084786 CN2014084786W WO2015139417A1 WO 2015139417 A1 WO2015139417 A1 WO 2015139417A1 CN 2014084786 W CN2014084786 W CN 2014084786W WO 2015139417 A1 WO2015139417 A1 WO 2015139417A1
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Prior art keywords
cell
terminal
frequency point
search
network
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PCT/CN2014/084786
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English (en)
French (fr)
Inventor
汤卫东
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中兴通讯股份有限公司
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Publication of WO2015139417A1 publication Critical patent/WO2015139417A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/16Discovering, processing access restriction or access information
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to the field of terminal network searching, and in particular, to a terminal automatic network searching method and device.
  • multimode terminals supporting LTE, WCDMA and GSM technologies can support access services in three network environments.
  • multimode terminals may need to work in different network modes. For example: Some network environments only support one or two mode access, then multimode terminals need to quickly and automatically select to the current network. Access to the network in an environment supported mode.
  • the current LTE network is not fully covered, only the central city and the hotspot area are deployed. Therefore, when the multimode terminal moves or switches between the areas, it is necessary to quickly find the network that is desired to be registered. Otherwise, it will bring a bad user experience and affect the application and promotion of LTE multi-mode terminal products.
  • the terminal uses the PLMN (Public Land Mobile Network) selection algorithm to perform PLMN selection, and sends the selected PLMN to the underlying RRC (Radio Resource Control) module.
  • the network search process of the RRC module includes: scanning the pre-stored frequency point information and the subsequent possible full-band scanning process, which are based on whether the PLMN delivered by the network side is consistent with the PLMN sent by the upper layer to determine whether the available information is found.
  • the terminal fails to participate in the judgment by using other useful messages other than the PLMN delivered by the network side, so that the entire network search process involves more judgments. Frequency.
  • the frequency-by-frequency search network is very time consuming and consumes radio frequency power consumption, which is not conducive to terminal standby time. Therefore, it is necessary to avoid the frequency sweeping of the entire frequency band as much as possible. At the same time, try to avoid the frequency-by-frequency attempt to find the corresponding network.
  • the technical problem to be solved by the present invention is to provide a method and device for automatically finding a network of a terminal, improving the efficiency of performing network search for each frequency point, and avoiding excessive consumption of radio frequency power as much as possible.
  • a method for automatically finding a network by a terminal including:
  • the terminal performs the following search process for each registered cell frequency point in the saved cell frequency point:
  • the method further includes:
  • the terminal Before performing the searching process, the terminal performs a cell frequency point saving process, where the cell frequency point saving process includes:
  • the terminal Whenever the terminal successfully registers with a cell, the terminal saves the frequency of the cell;
  • the terminal saves the neighboring cell frequency point.
  • the available cell refers to the cell satisfies the cell selection S criterion, and the PLMN to which the cell belongs is consistent with the PLMN selected by the terminal.
  • the step of the terminal performing a search process for each registered cell frequency point in the saved cell frequency point includes:
  • the terminal performs the search process in the order of registration for each registered cell frequency point in the saved cell frequency point.
  • the method further includes:
  • the search process is performed in all frequency points supported by the terminal.
  • the method further includes: When the terminal is a multi-mode terminal, if an available cell is not found in the current network standard, the available cell is searched for in the next network system according to the priority of the network standard.
  • a terminal automatic network searching device comprising a search module, wherein:
  • the search module is configured to: perform the following search operation for each registered cell frequency point in the cell frequency point that the terminal has saved:
  • Select one cell frequency point as the current frequency point among all the registered cell frequency points search for whether there is available cell at the current frequency point, and if so, find an available cell; otherwise, the neighboring cell frequency corresponding to the current frequency point
  • the point searches for whether there is a available cell, and if so, finds an available cell, otherwise the next registered cell frequency point is used as the current frequency point to perform the search operation.
  • the device further includes a pre-storage module, where:
  • the pre-storage module is configured to: when the terminal is successfully registered to a cell, save the frequency of the cell; and obtain the neighbor cell frequency of the cell from a system message periodically sent by the network to the terminal, and The neighboring cell frequency point is saved.
  • the available cell refers to a cell that satisfies a cell selection S criterion, and the cell belongs to
  • the PLMN is the same as the PLMN selected by the terminal.
  • the searching module is configured to perform a search process for each registered cell frequency point in the saved cell frequency points as follows:
  • the search process is sequentially performed in order of registration for each registered cell frequency point.
  • the searching module is further configured to:
  • the search process is performed in all frequency points supported by the terminal.
  • the searching module is further configured to:
  • the present invention has at least the following advantages:
  • the frequency information of the neighboring cell is used to optimize the related network searching process, thereby minimizing the length of time for the terminal to find the network, improving the user experience, especially saving the power consumption of the multimode terminal and increasing the standby time.
  • FIG. 1 is a flowchart of a method for automatically finding a network by a terminal according to a first embodiment of the present invention
  • FIG. 2 is a schematic diagram showing the composition of an automatic network finding device of a terminal according to a second embodiment of the present invention.
  • a first embodiment of the present invention discloses a method for automatically finding a network by a terminal. As shown in FIG. 1, the method includes the following steps:
  • Step S101 Whenever the terminal successfully registers with any cell, the terminal saves the frequency point of the cell and the neighboring cell frequency point of the cell.
  • the network side periodically sends a system message to the terminal, where information about the cell adjacent to the registered cell is obtained, where the neighboring cell frequency point is included.
  • the multi-mode terminal in the 4G network standard the SIB1 message periodically sent by the network received by the terminal, wherein the scheduling period and the message window length of the SIB5, SIB6, and SIB7 messages are configured, and the SIB5 message includes the part cell.
  • the frequency of the network standard, the frequency of the 3G network standard of the neighboring cell, and the frequency of the 2G network of the neighboring cell are usually, at the same place, one cell corresponds to one frequency point.
  • Step S102 The terminal performs the following search process for each registered cell frequency point in the saved cell frequency point:
  • the cell selection S criterion refers to satisfying condition 1 and condition 2 at the same time.
  • Qrexlevmeas refers to the measured current cell received power
  • Qrxlevmin refers to the required minimum received power
  • Pcompensation refers to the received power compensation value
  • condition 1 refers to the measured current cell
  • the received power is subtracted from the required minimum received power, and the difference obtained by subtracting the received power compensation value is greater than zero.
  • the available cell refers to the cell that satisfies the S criterion, and the PLMN to which the cell belongs is the PLMN selected by the terminal.
  • PLMN is to ensure that it is not registered to other networks, for example: to ensure that China Mobile's SIM card is not registered on China Unicom's network, China Mobile The PLMN and China Unicom's PLMN are definitely not the same.
  • the frequency search may be performed by selecting a frequency point from all the registered cell frequency points in the order of registration as the current frequency point.
  • the terminal may be a single mode terminal, a dual mode terminal, or a multimode terminal.
  • the single mode terminal can only support a single network standard, for example: GSM
  • the dual mode terminal can support two network standards, such as: GSM, and LTE.
  • Multimode terminals can support multiple network standards. Different modes of operation can be set in the dual mode or multimode terminal, such as: multimode 4G priority, multimode 3G priority, multimode 2G priority, 4G only, 3G only, 2G only mode, etc.
  • the terminal searches for an available cell at a certain frequency, that is, when looking for a network, it must be in a specific network standard. If the available cell is not found under the network standard, for the multimode terminal, it may follow The next priority network standard is to find the network.
  • step S102 can be further described as follows: The terminal performs the search process for each registered cell frequency point in the saved cell frequency point in the set network system.
  • the set network format includes: a single network standard, or a network standard that is sequentially processed in a prioritized network system.
  • each network system can record up to 10 registered frequency points, which can be stored in the order of registration.
  • the frequency points can be sequentially selected according to the registration time sequence. search for.
  • the types of network standards include: 2G (2rd Generation, 2nd generation mobile communication technology) network standard, 3G (3rd Generation, 3rd generation mobile communication technology) network standard, 4G (4rd Generation, The fourth generation of mobile communication technology) network standard.
  • the 4G network standard may be an FDD-LTE or TDD-LTE network standard.
  • step S102 the specific process of searching whether there is an available cell includes:
  • step A1 determining whether the cell corresponding to the searched frequency point meets the cell selection S criterion, and if yes, executing step A2, otherwise, the available cell is not found, and the search process ends;
  • A2 It is determined whether the PLMN delivered by the network side is consistent with the locally selected PLMN, and if yes, the available cell is found, otherwise the available cell is not found.
  • the above search process in the frequency of the saved cell uses the frequency point information of the neighboring cell sent by the network side to optimize the network searching process of the terminal. If the available cell is found for network registration, the terminal is greatly reduced. If the available cell is not found in the saved cell frequency, the method further includes:
  • Step S103 Perform the search process in all the frequency points supported by the terminal. For the frequency point that is searching for the available cell, obtain the neighbor cell frequency point corresponding to the frequency point, to support the search process.
  • the cell frequency point that the terminal has saved is a subset of all frequency points supported by the terminal.
  • the obtained neighboring cell frequency point corresponding to the frequency point is also derived from a system message that is periodically sent to the terminal by the network side.
  • step S102 since the search process of the terminal in step S102 is actually performed by setting the network standard, this step should also be followed by step S102, and the terminal initiates execution of the above all frequency points supported under the set network standard. Search process.
  • the search process is similar to that in step S102, and therefore will not be described here.
  • the second embodiment of the present invention corresponds to the method for automatically finding a network in the terminal of the first embodiment.
  • the embodiment provides an automatic network searching device for the terminal.
  • the device includes a pre-storage module 100 and a search module 200, where:
  • the pre-storage module 100 is configured to: when the terminal successfully registers with any cell, save the frequency point of the cell and the corresponding neighboring cell frequency point;
  • the network side periodically sends a system message to the terminal, and the pre-storage module 100 can obtain information about the cell adjacent to the registered cell from the system message, where the frequency of the neighboring cell is included. Therefore, the frequency of the neighboring cell is derived from the system message that is periodically sent to the terminal by the network.
  • the search module 200 is configured to: perform the following search operation for each registered cell frequency point in the saved cell frequency point:
  • the search module 200 determines whether the cell corresponding to the searched frequency point meets the cell selection S criterion, and if yes, determines whether the PLMN sent by the network side is consistent with the locally selected PLMN, and if yes, finds an available cell, otherwise, No available cells were found; if not, no available cells were found.
  • the terminal searches for an available cell at a certain frequency, that is, when looking for a network, it must be in a specific network standard. If the available cell is not found under the network standard, for the multimode terminal, it may follow A priority network standard to find the network. Therefore, the function of the search module 200 can be further described as:
  • the search module 200 is configured to: perform the search process for each registered cell frequency point in the saved cell frequency point in the set network mode; the setting network format includes: a single network standard, Or a network system that is processed sequentially in a prioritized network format.
  • the search process of the search module 200 in the saved cell frequency point utilizes the frequency point information of the neighboring cell delivered by the network side to optimize the network searching process of the terminal, and if an available cell is found, it is extremely
  • the search module 200 is further configured to: perform the search operation in all frequency points supported by the terminal, if the search module 200 does not find an available cell in the frequency of the saved cell.
  • the storage module 100 is further configured to: acquire, according to a frequency point that the available cell is being searched, a neighboring cell frequency point corresponding to the frequency point, to support the searching process.
  • the search operation of the search module 200 in the saved cell frequency point is actually performed based on the set network standard, at this time, it is also executed in all the frequency points supported by the terminal in the set network standard.
  • the search operation is similar to the search operation of the search module 200 in the saved cell frequency point, and therefore is not described here.
  • the third embodiment of the present invention provides an application example of the present invention based on the first and second embodiments.
  • the network selection process of this embodiment involves at least the following modules: a PLMN selection module, a network standard selection module, a neighbor cell information acquisition module, a search module, and a registration module.
  • a PLMN selection module a network standard selection module
  • a neighbor cell information acquisition module a cell information acquisition module
  • a search module a registration module.
  • the functions of each module are described in detail below.
  • the PLMN selection module mainly selects the PLMN network according to the protocol specification and the PLMN selection priority set by the operator or the user.
  • the PLMN selection module selects a good PLMN for use in subsequent judgment of available cells.
  • the detailed algorithm of the PLMN selection module is well known in the art and will not be described in detail herein.
  • the network standard selection module mainly selects or sets the network standard according to the network standard and the access priority that the terminal can access.
  • the network standard and the access priority that the terminal can access With the development and commercialization of the 3rd and 4th generation wireless communication technologies, it is generally required that the user set the network system type and the priority of each system that the terminal can support.
  • common settings for LTE multimode terminals are: multimode 4G priority, multimode 3G priority, multimode 2G priority, 4G only, 3G only, 2G only mode, and so on.
  • the neighboring cell information acquiring module is similar to the pre-storage module in the second embodiment, and is responsible for acquiring neighbor cell information in a system message that is periodically sent by the network side for the currently registered cell, and corresponding to the frequency of the registered cell. The corresponding frequency of the neighboring cell is saved.
  • the SIB (system information block) message is transmitted on the DL-SCH (Downlink Shared Channel).
  • the terminal needs to be in the Idle mode.
  • the handover is completed, and the system is re-entered. Read from the channel by the coverage area, when the update indication is received, and when the maximum valid time is exceeded.
  • the SIB1 message uses a fixed scheduling period, the scheduling period is 80ms, and the initial transmission position is the subframe No. 5 (Subframe #5).
  • the SIB5, SIB6 and SIB7 messages use a dynamic scheduling cycle whose scheduling period and message window length are configured in the SIB1 message. That is, the terminal first reads the SIB1 message from the fixed channel and the scheduling period, and then reads the SIB5, SIB6, and SIB7 messages according to the dynamic scheduling information indicated in the SIB1 message. The specific reading process is implemented by the terminal to indicate the physical layer.
  • the search module is responsible for performing cell search using the registered cell frequency point information, performing cell search using neighbor cell information, and searching for a full-band cell.
  • the frequency information of the currently registered network is saved in the terminal, so that when the terminal is powered on again or the service is lost, the network can be given priority.
  • the search for available cells is performed using the frequency information of the last registration.
  • the terminal generally records up to 10 frequency points in each system, and arranges according to the time of registration.
  • the neighbor cell information of the current network is also read and stored in another neighbor cell information list. in.
  • the frequency point information is arranged according to the principle of first in first out, and corresponds to the frequency point in the currently registered frequency point information list.
  • the terminal In the cell search phase using the neighbor cell frequency information, the terminal enters the phase after the first frequency information in the list is not searched for the available cell. First, the terminal has to judge the reason why the available cell is not searched at the first frequency. If the cell signal is poor, the cell selection is not satisfied.
  • the terminal needs to further read the neighbor cell information of the current cell to determine whether other cell frequency points exist.
  • the method for obtaining the information of the neighboring cell is described in the foregoing, and is read from the system message periodically sent by the network side. If the neighboring cell frequency exists, the available cell is searched for at the new frequency. If the search is successful, the registration is successful, otherwise the failure returns. If no cell is searched, the terminal finds the neighbor cell information corresponding to the frequency point from the saved neighbor cell information list, and if yes, performs an available cell search on the frequency point, and if the search succeeds, the registration is performed, otherwise, Failed to return.
  • the terminal initiates a search for all existing frequency points in the current network system at the bottom layer, and then tries each frequency point.
  • the foregoing method for searching for an available cell can also be utilized.
  • the terminal further determines whether there is neighbor cell information, thereby Search for new available cells at the neighboring cell frequency. This can speed up the terminal to find the speed of the currently available cell, and avoid simply trying all the frequency information to find the available cell.
  • the registration module is responsible for the cell registration process.
  • the embodiment of the present invention further includes: when performing cell reselection and neighbor cell measurement after the terminal registers a certain cell, updating the neighbor cell information list in the terminal according to the acquired neighbor cell information, to ensure As much as possible in the neighbor cell information list of the terminal is the neighbor cell information of the current location of the terminal.
  • Step 1 The PLMN selection module selects the PLMN to be registered according to the PLMN selection priority set by the protocol, the operator or the user;
  • Step 2 Frequency selection process.
  • the terminal selects the first frequency point from the list of registered cell frequency point information, and searches for available cells of the frequency point. If the searched cell satisfies the cell selection S criterion and the read PLMN information is the PLMN that wishes to register, then step 5 is performed to camp and register. If the search for the available cell fails or the camping and registration fails because the searched cell does not satisfy the cell selection S criterion, then step 3 is entered.
  • Step 3 Read the frequency point information of the neighboring cell from the stored neighbor cell information list to perform cell search again; if no cell is searched under the current neighbor cell frequency point, select a new frequency from the neighbor cell information list. The point searches for the available cell, and if the search succeeds, the registration is successful, and if the search fails, it returns, until all neighboring cell frequencies corresponding to the registered first frequency point are tried. If no cells are found in all neighboring cell frequencies corresponding to the registered first frequency point, the second frequency point is selected from the registered cell frequency point information list to search, and so on, until All registered cell frequencies have been tried. If all the registered cell frequency points and their corresponding neighboring cell frequencies have tried to find an available cell, then go to step 4.
  • Step 4 The terminal starts the network search process in the full frequency band.
  • the terminal first triggers the underlying search for all available frequency points in the current network, and then performs cell search on a frequency-by-frequency basis until an available cell is found, thereby completing the camping and registration.
  • the method of the third step can be used to further read the neighbor cell frequency point information of the cell currently being searched, and perform the search of the available cell area.
  • Step 5 The terminal performs the resident and registration process on the available cells found. If the registration is successful, the terminal further reads the neighbor cell information sent by the network, and updates the once registered frequency information list and the neighbor cell information list stored in the terminal. In addition, when the terminal performs cell reselection and neighbor cell measurement, the neighbor cell information list is further updated according to the measurement result.
  • the embodiment of the invention optimizes the network searching algorithm of the terminal by using the system message periodically sent by the network side.
  • the terminal is used to perform the cell search stage in the first stage, that is, using the saved frequency information as soon as possible. Segment, find the PLMN network that you want to register, complete the residency and registration process, so as to avoid entering the full-frequency sweep frequency finding phase of time-consuming power consumption.
  • the full-band sweep frequency finding phase it is avoided to try all the frequency points to find the corresponding network.
  • the terminal automatically finds a network method and device according to the embodiment of the present invention, and uses the frequency point information of the neighboring cell to optimize the related network searching process, thereby reducing the time for finding the network by the terminal, improving the user experience, and particularly saving the work of the multi-mode terminal. Consumption, increase standby time.
  • the foregoing technical solution optimizes the related network searching process by using the frequency information of the neighboring cell, minimizes the length of time for the terminal to find the network, improves the user experience, and particularly saves the power consumption of the multimode terminal and increases the standby time. Therefore, the present invention has strong industrial applicability.

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  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
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Abstract

一种终端自动找网方法及装置,该方法包括:终端在已保存的小区频点中,依次针对每个已注册的小区频点执行如下搜索过程:在当前频点下搜索是否有可用的小区,若有,则找到可用的小区;否则在当前频点对应的小区信号较差的情况下,在当前频点对应的邻小区频点中搜索是否有可用的小区,若有,则找到可用的小区,否则将下一个已注册的小区频点作为当前频点执行所述搜索过程。该装置包括:预存储模块和搜索模块。上述技术方案利用邻小区的频点信息优化相关的找网过程,尽可能减少终端找网时长,提升了用户体验,尤其节省了多模终端的功耗,增加待机时间。

Description

一种终端自动找网方法及装置
技术领域
本发明涉及终端找网技术领域,尤其涉及一种终端自动找网方法及装置。
背景技术
随着第四代移动通信技术的发展, FDD-LTE ( Frequency Division Duplexing -LTE, 频分双工模式的长期演进技术)和 TDD-LTE ( Time Division Duplexing -LTE, 时分双工模式的长期演进技术)等逐步进入了实用阶段, 同 时支持 LTE、 WCDMA和 GSM技术的多模终端可以支持三种网络环境下的 接入服务。 目前, 在不同的网络环境下, 多模终端可能需要工作在不同的网 络模式, 例如: 有些网络环境仅支持一种或两种的模式接入, 则多模终端需 要快速的自动选择到当前网络环境支持的模式下接入网络。 并且, 由于当前 LTE网络还没有全面覆盖, 仅在中心城市和热点区域布网, 因此多模终端在 各区域之间移动或开关机时, 需要快速的找到希望注册的网络。 否则, 会带 来不好的用户体验, 影响 LTE多模终端产品的应用和推广。
相关的找网算法中, 终端釆用 PLMN ( Public Land Mobile Network , 公共 陆地移动网络)选择算法进行 PLMN选择, 将选择好的 PLMN下发给底层 RRC ( Radio Resource Control, 无线资源控制)模块。 RRC模块的找网过程 包括: 扫描预存频点信息以及后续可能的全频段扫描过程, 均是仅基于网络 侧下发的 PLMN与上层下发来的 PLMN的一致与否来判断是否找到了可用的 小区, 这样做存在以下问题: 第一, 针对每个频点, 终端未能利用网络侧下 发的除 PLMN以外的其它有用消息参与判断, 导致整个找网过程将涉及更多 的用于判断的频点。 第二, 若扫频针对的频点数量庞大时, 逐个频点的搜索 网络是非常耗时, 并且消耗射频功耗, 不利于终端待机时间。 因此, 需要尽 量避免全频段的扫频找网, 同时, 尽量避免逐个频点的尝试完才能找到相应 的网络。
发明内容 本发明要解决的技术问题是, 提供一种终端自动找网方法及装置, 提升 针对各频点进行网络搜索的效率, 尽量避免消耗过多的射频功耗。
为解决上述技术问题, 釆用如下技术方案:
种终端自动找网方法, 包括:
终端在已保存的小区频点中, 针对每个已注册的小区频点执行如下搜索 过程:
在所有已注册的小区频点中选择一个小区频点作为当前频点, 在当前频 点下搜索是否有可用的小区, 若有, 则找到可用的小区; 否则在当前频点对 应的邻小区频点中搜索是否有可用的小区, 若有, 则找到可用的小区, 否则 将下一个已注册的小区频点作为当前频点执行所述搜索过程。
可选地, 该方法还包括:
所述终端在执行所述搜索过程之前, 执行小区频点的保存过程, 该小区 频点的保存过程包括:
每当终端成功注册到一小区时, 终端保存所述小区的频点;
终端从网络侧定期下发给终端的系统消息中获取所述小区的邻小区频 点;
终端保存所述邻小区频点。
可选地, 可用的小区是指小区满足小区选择 S 准则, 且该小区所属的 PLMN与终端选择的 PLMN—致。
可选地, 所述终端在已保存的小区频点中, 针对每个已注册的小区频点 执行搜索过程的步骤包括:
所述终端在已保存的小区频点中, 针对每个已注册的小区频点按照注册 的先后顺序依次执行所述搜索过程。
可选地, 该方法还包括:
在已保存的小区频点中未找到可用的小区时, 在终端支持的所有频点中 执行所述搜索过程。
可选地, 该方法还包括: 当所述终端为多模终端时, 若在当前网络制式下未找到可用的小区, 则 按照网络制式的优先级在下一网络制式下搜索可用的小区。
一种终端自动找网装置, 包括搜索模块, 其中:
所述搜索模块设置成: 在终端已保存的小区频点中针对每个已注册的小 区频点执行如下搜索操作:
在所有已注册的小区频点中选择一个小区频点作为当前频点, 在当前频 点下搜索是否有可用的小区, 若有, 则找到可用的小区; 否则在当前频点对 应的邻小区频点中搜索是否有可用的小区, 若有, 则找到可用的小区, 否则 将下一个已注册的小区频点作为当前频点执行所述搜索操作。
可选地, 所述装置还包括预存储模块, 其中:
所述预存储模块设置成: 每当终端成功注册到一小区时, 保存所述小区 的频点; 还从网络侧定期下发给终端的系统消息中获取所述小区的邻小区频 点, 并保存所述邻小区频点。
可选地, 可用的小区是指小区满足小区选择 S 准则, 且该小区所属的
PLMN与终端选择的 PLMN—致。
可选地, 所述搜索模块设置成按照如下方式在已保存的小区频点中, 针 对每个已注册的小区频点执行搜索过程:
在已保存的小区频点中, 针对每个已注册的小区频点按照注册的先后顺 序依次执行所述搜索过程。
可选地, 所述搜索模块还设置成:
在已保存的小区频点中未找到可用的小区时, 在终端支持的所有频点中 执行所述搜索过程。
可选地, 所述搜索模块还设置成:
当所述终端为多模终端时, 若在当前网络制式下未找到可用的小区, 则 按照网络制式的优先级在下一网络制式下搜索可用的小区。 釆用上述技术方案, 本发明至少具有下列优点:
利用邻小区的频点信息优化相关的找网过程,尽可能减少终端找网时长, 提升了用户体验, 尤其节省了多模终端的功耗, 增加待机时间。 附图概述
图 1 为本发明第一实施例的终端自动找网方法流程图;
图 2 为本发明第二实施例的终端自动找网装置组成示意图。
本发明的较佳实施方式
以下将结合附图及实施例, 对本发明的具体实施进行详细说明。
本发明第一实施例, 公开了一种终端自动找网方法, 如图 1所示, 该方 法包括以下步骤:
步骤 S101 , 每当终端成功注册到任一小区时, 终端保存所述小区的频点 及所述小区的邻小区频点。
可选地, 网络侧会定期给终端下发系统消息, 从该系统消息中可以获得 与注册小区相邻的小区的信息, 其中就包括邻小区频点。 比如: 多模终端在 4G 网络制式下, 终端接收到的网络侧定期下发的 SIB1 消息, 其中配置有 SIB5、 SIB6以及 SIB7消息的调度周期和消息窗口长度, 而 SIB5消息中又包 含部小区的 4G网络制式频点, SIB6消息中又包含部小区的 3G网络制式频点, SIB7消息中又包含部小区的 2G网络制式频点, 据此, 就可知邻小区的频点 包括:邻小区的 4G网络制式频点、邻小区的 3G网络制式频点、邻小区的 2G 网络制式频点。 通常, 在同一地点处, 一个小区对应一个频点。
步骤 S102, 终端在已保存的小区频点中针对每个已注册的小区频点执行 如下搜索过程:
从所有已注册的小区频点中选择一个小区频点作为当前频点, 在当前频 点下搜索是否有可用的小区, 若有, 则找到可用的小区; 否则在当前频点对 应的邻小区频点中搜索是否有可用的小区, 若有, 则找到可用的小区, 否则 将下一个已注册的小区频点作为当前频点, 执行上述述搜索过程。 其中, 所述的小区选择 S准则, 是指同时满足条件 1和条件 2。 其中, 条件 1是指 rxlev = Qrxlevmeas - Qrxlevmin - Pcompensation > 0, 其中, Qrexlevmeas指测量的当前小区接收功率, Qrxlevmin指要求的最小接收功率, Pcompensation指接收功率补偿值, 条件 1是指测量的当前小区接收功率减去 要求的最小接收功率, 在减去接收功率补偿值得到的差值大于 0。 条件 2是 指 Squal = Qqualmeas - Qqualmin > 0, 其中, Qqualmeas是指测量的当前小区 的 Ec/No值, Qqualmin指要求的最小 Ec/No值, 条件 2是指测量的当前小区 的 Ec/No值减去要求的最小 Ec/No值得到的差值。 这里指的可用小区, 指的 是小区满足 S准则,并且该小区所属的 PLMN就是终端选择的 PLMN。因为, 满足了 S准则, 说明该小区的信息质量满足注册的要求, PLMN—致是为了 保证不注册到其他网络上, 例如: 保证中国移动的 SIM卡不注册到中国联通 的网络上, 中国移动的 PLMN和中国联通的 PLMN肯定是不一样的。
可选地, 可以按照注册的先后顺序从所有已注册的小区频点中选择频点 作为当前频点执行上述搜索过程。
可选地, 终端可以是单模终端、 双模终端或者多模终端, 单模终端仅能 支持单一的网络制式, 比如: GSM, 双模终端可以支持两种网络制式, 比如: GSM、 和 LTE, 多模终端则可以支持多种网络制式。 双模或多模终端中又可 以设置不同的工作模式, 比如: 多模 4G优先、 多模 3G优先、 多模 2G优先、 4G only、 3G only、 2G only模式等。 但是, 终端在某频点下搜索可用小区即 找网时, 必然是处在一个特定的网络制式下的, 若在该网络制式下未找到可 用小区, 对于多模终端来说, 可能就会按照下一优先级的网络制式来找网。
因此, 可以将步骤 S102进一步的描述为: 终端在设定网络制式下, 在已 保存的小区频点中针对每个已注册的小区频点, 执行所述搜索过程。
该设定网络制式包括: 单一的网络制式、 或者在按照优先级排列的网络 制式中顺次处理到的一个网络制式。 为了不过多占用终端的存储空间, 每个 网络制式下可以最多记录 10个已注册过的频点,可以按照注册的先后顺序进 行存储, 后续找网时可以按照注册的时间顺序依次选取频点进行搜索。
网络制式的种类包括: 2G ( 2rd Generation, 第二代移动通信技术) 网络 制式、 3G( 3rd Generation,第三代移动通信技术)网络制式、 4G( 4rd Generation, 第四代移动通信技术)网络制式。本实施例中, 4G网络制式可以是 FDD-LTE 或者 TDD-LTE网络制式。
在步骤 S102中, 所述搜索是否有可用小区的具体过程包括:
A1 , 判断搜索的频点对应的小区是否符合小区选择 S准则, 若是, 则执 行步骤 A2, 否则未找到可用的小区, 本次搜索过程结束;
A2, 判断网络侧下发的 PLMN与本地选择的 PLMN是否一致, 若是, 则找到可用的小区, 否则未找到可用的小区。
上述在已保存的小区的频点中的搜索过程, 由于利用了网络侧下发的邻 小区的频点信息来优化终端的找网过程, 若找到可用小区进行网络注册, 则 极大减少了终端找网时长, 若在已保存的小区频点中未找到可用的小区时, 所述方法还包括:
步骤 S103 , 在终端支持的所有频点中执行所述搜索过程; 针对正在搜索 可用小区的频点, 获取所述频点对应的邻小区频点, 用于支持所述搜索过程。
其中, 终端已保存的小区频点是终端支持的所有频点的一个子集。
可选地, 获取的所述频点对应的邻小区频点也来源于网络侧定期下发给 终端的系统消息。
另夕卜,由于步骤 S102中终端的搜索过程实际上^^于设定网络制式进行 的, 本步骤中也应是接续步骤 S102, 终端发起在设定网络制式下支持的所有 频点中执行上述搜索过程。 搜索过程与步骤 S102中类似, 故此处不赘述。
本发明第二实施例, 与第一实施例的终端自动找网方法对应, 本实施例 提供一种终端自动找网装置, 如图 2所示, 包括预存储模块 100和搜索模块 200, 其中:
1 )预存储模块 100, 设置成: 每当终端成功注册到任一小区时, 保存所 述小区的频点及对应的邻小区频点;
可选地, 网络侧会定期给终端下发系统消息, 预存储模块 100可以从该 系统消息中可以获得与注册小区相邻的小区的信息, 其中就包括邻小区的频 点。 故, 邻小区频点来源于网络侧定期下发给终端的系统消息。 2 )搜索模块 200, 设置成: 在已保存的小区频点中针对每个已注册的小 区频点执行如下搜索操作:
从所有已注册的小区频点中选择一个小区频点作为当前频点, 在当前频 点下搜索是否有可用的小区, 若有, 则找到可用的小区; 否则在当前频点对 应的邻小区频点中搜索是否有可用的小区, 若有, 则找到可用的小区, 否则 将下一个已注册的小区频点作为当前频点, 执行所述搜索操作。
可选地, 搜索模块 200判断搜索的频点对应的小区是否符合小区选择 S 准则, 若符合, 则判断网络侧下发的 PLMN与本地选择的 PLMN是否一致, 若是, 则找到可用的小区, 否则未找到可用的小区; 若不符合, 则未找到可 用的小区。
由于终端在某频点下搜索可用小区即找网时, 必然是处在一个特定的网 络制式下的, 若在该网络制式下未找到可用小区, 对于多模终端来说, 可能 就会按照下一优先级的网络制式来找网。 因此, 可以将搜索模块 200的功能 进一步的描述为:
搜索模块 200设置成: 在设定网络制式下, 在已保存的小区频点中依次 针对每个已注册的小区频点执行所述搜索过程; 所述设定网络制式包括: 单一的网络制式、 或者在按照优先级排列的网 络制式中顺次处理到的一个网络制式。
基于上述的描述, 搜索模块 200在已保存的小区频点中的搜索过程, 由 于利用了网络侧下发的邻小区的频点信息来优化终端的找网过程, 若找到可 用小区, 则极大减少了终端找网时长, 若搜索模块 200在已保存的小区的频 点中未找到可用的小区时, 则搜索模块 200还设置成: 在终端支持的所有频 点中执行所述搜索操作, 预存储模块 100还设置成: 针对正在搜索可用小区 的频点, 获取所述频点对应的邻小区频点, 用于支持所述搜索过程。
可选地, 由于搜索模块 200在已保存的小区频点中的搜索操作, 实际上 是基于设定网络制式进行的, 那么此时, 也是在设定网络制式下终端支持的 所有频点中执行上述搜索操作, 该搜索操作与搜索模块 200在已保存的小区 频点中的搜索操作类似, 故此处不赘述。 本发明第三实施例, 基于上述第一、 二实施例, 本实施例提供一个本发 明的应用实例。
本实施例的选网过程至少涉及以下模块: PLMN选择模块、 网络制式选 择模块、 邻小区信息获取模块、 搜索模块、 以及注册模块。 各模块的功能详 细介绍 ^下:
PLMN选择模块,主要是根据协议规定、以及运营商或用户设置的 PLMN 选择优先级进行 PLMN网络的选择。 该 PLMN选择模块选择好的 PLMN供 后续进行可用小区判断时使用。 该 PLMN选择模块的详细算法是本领域的公 知技术, 故此处不再详述。
网络制式选择模块, 主要根据用户设置的终端可以接入的网络制式以及 接入优先级进行相应的网络制式选择或设定。 随着第 3代、 第 4代无线通信 技术的发展和商用, 当前一般需要用户设置终端可以支持的网络制式种类和 各制式的优先级。 例如 LTE多模终端常见的设置有: 多模 4G优先、 多模 3G 优先、 多模 2G优先、 4G only、 3G only、 2G only模式等。
邻小区信息获取模块, 类似于第二实施例中的预存储模块, 负责从网络 侧定期下发的针对当前注册小区的系统消息中获取邻小区信息, 并将已注册 小区的频点与其对应的邻小区频点对应的保存。 SIB( system information block , 系统信息块) 消息是在 DL-SCH ( Downlink Shared Channel, 下行共享信道) 上传输的, 按照协议终端需要在 Idle模式下, 当选择 /重选小区、 切换完成、 重新进入覆盖区域、 收到更新指示和超过最大有效时间等时机, 从该信道上 读取。 SIB1消息釆用固定的调度周期, 其调度周期是 80ms, 初次传输的位置 为第 5号子帧(Subframe #5 ) 。 SIB5、 SIB6和 SIB7消息釆用动态调度周期, 其调度周期和消息窗口长度在 SIB1消息中进行配置。即终端先从固定的信道 和调度周期上读取 SIB1消息, 然后根据 SIB1消息中指示的动态调度信息读 取 SIB5、 SIB6、 SIB7消息, 具体读取过程由终端指示物理层实现。
搜索模块, 负责利用已注册的小区频点信息进行小区搜索、 利用邻小区 信息进行小区搜索、 以及全频段小区搜索。 在利用已保存的频点信息进行小区搜索阶段, 终端关机时或者注册上网 络时, 会将当前注册网络的频点信息保存在终端内, 以便终端再次开机或者 丟失服务重新找网时, 可以优先利用上次注册的频点信息进行可用小区的搜 索。 终端在各制式下一般最多记录 10个频点信息, 按照曾经注册的时间进行 排列。 本发明实施例中, 当终端关机或注册成功时, 除了将当前注册的小区 频点信息进行保存外, 还将读取当前网络的邻小区信息, 并将其保存在另外 一张邻小区信息列表中。 在邻小区信息列表中, 频点信息的排列方式是按照 先进先出的原则, 并且和当前注册的频点信息列表中的频点对应。
在利用邻小区频点信息进行小区搜索阶段, 终端利用列表中的第 1个频 点信息没有搜索到可用小区后, 会进入该阶段。 首先, 终端要判断在第 1频 点没有搜索到可用小区的原因。 如果是由于小区信号较差, 不满足小区选择
S 准则, 则终端需要进一步读取当前小区的邻小区信息, 以判断是否有其它 小区频点存在。 邻小区信息的获取方法, 在前面已经介绍过, 从网络侧周期 性下发的系统消息中读取。 如果邻小区频点存在, 则在新的频点上搜索可用 小区, 搜索成功则注册, 否则失败返回。 如果是没搜索到任何小区, 则终端 从已保存的邻小区信息列表中找到该频点对应的邻小区信息, 如果存在, 则 在该频点上进行可用小区搜索, 搜索成功则进行注册, 否则失败返回。
在全频段找网阶段, 终端会在底层发起当前网络制式下所有存在的频点 的搜索, 然后逐个频点的尝试。 在该阶段中, 同样可以利用前述搜索可用小 区的方法, 当在某个频点没有搜索到可用小区的原因是该小区不满足小区选 择 S准则时, 终端转而判断是否存在邻小区信息, 从而在邻小区频点上搜索 新的可用小区。 这样可以加速终端找到当前中可用小区的速度, 避免简单的 将所有频点信息尝试完才能找到可用小区。
注册模块, 负责小区注册过程。
另外, 优选的, 本发明实施例还包括: 在终端注册上某一小区后进行小 区重选和邻小区测量时, 基于获取到的邻小区信息对终端中的邻小区信息列 表进行更新, 以保证终端的邻小区信息列表中尽量保存的是终端当前位置的 邻小区信息。
下面对终端开机注册或丟失服务后, 按照本发明实施例的技术方案进行 找网的过程进行描述, 如下:
第 1步: PLMN选择模块根据协议规定、 运营商或用户设置的 PLMN选 择优先级选择需要注册的 PLMN;
第 2步: 频点选择过程。 终端从已注册的小区频点信息列表中选择第 1 个频点, 并搜索该频点的可用小区。 如果搜索到的小区满足小区选择 S准则 且读取的 PLMN信息是希望注册的 PLMN, 则进行第 5步进行驻留和注册。 如果因搜索到的小区不满足小区选择 S准则导致搜索可用小区失败或者驻留 和注册失败, 则进入第 3步。
第 3步: 从存储的邻小区信息列表中读取邻小区的频点信息重新进行小 区搜索; 如果当前的邻小区频点下没有搜索到任何小区, 则从邻小区信息列 表中选择新的频点进行可用小区的搜索, 搜索成功则注册, 搜索失败则返回, 直至将已注册的第 1个频点对应的所有邻小区频点均尝试过。 若已注册的第 1 个频点对应的所有邻小区频点下均未找到可用的小区, 则从已注册的小区 频点信息列表中选择第 2个频点进行搜索, 依此类推, 直至将已注册的所有 小区频点均尝试过。 若所有已注册的小区频点及其对应的邻小区频点均尝试 过仍未找到可用的小区, 则进入第 4步。
第 4步: 终端开启全频段的找网过程。 终端首先触发底层搜索当前网络 中的所有的可用频点, 然后再逐个频点的进行小区搜索, 直至找到可用的小 区, 从而完成驻留和注册。 在某频点进行小区搜索过程中, 通常可以利用第 3 步的方法, 进一步读取当前正搜索的小区的邻小区频点信息, 进行可用小 区的搜索。
第 5步: 终端在找到的可用小区上进行驻留和注册过程。 如果注册成功, 则终端进一步读出网络下发的邻小区信息, 对存储在终端内的曾经注册的频 点信息列表和邻小区信息列表进行更新。 另外, 在终端进行小区重选和邻小 区测量时, 根据测量的结果, 进一步对邻小区信息列表进行更新。
本发明实施例利用网络侧周期性下发的系统消息,优化终端的找网算法。 一方面, 使终端尽快在第 1阶段即在利用已保存的频点信息进行小区搜索阶 段, 找到希望注册的 PLMN网络, 完成驻留和注册过程, 从而避免进入到耗 时耗电的全频段扫频找网阶段。 另一方面, 在第 2阶段即全频段扫频找网阶 段, 避免将所有的频点尝试完才能找到相应的网络。
本发明实施例的所述终端自动找网方法及装置, 利用邻小区的频点信息 优化相关的找网过程, 尽可能减少终端找网时长, 提升了用户体验, 尤其节 省了多模终端的功耗, 增加待机时间。
通过具体实施方式的说明, 应当可对本发明为达成预定目的所釆取的技 术手段及功效得以更加深入且具体的了解, 然而所附图示仅是提供参考与说 明之用, 并非用来对本发明加以限制。
工业实用性
上述技术方案利用邻小区的频点信息优化相关的找网过程, 尽可能减少 终端找网时长, 提升了用户体验, 尤其节省了多模终端的功耗, 增加待机时 间。 因此本发明具有很强的工业实用性。

Claims

权 利 要 求 书
1、 一种终端自动找网方法, 包括:
终端在已保存的小区频点中, 针对每个已注册的小区频点执行如下搜索 过程:
在所有已注册的小区频点中选择一个小区频点作为当前频点, 在当前频 点下搜索是否有可用的小区, 若有, 则找到可用的小区; 否则在当前频点对 应的邻小区频点中搜索是否有可用的小区, 若有, 则找到可用的小区, 否则 将下一个已注册的小区频点作为当前频点执行所述搜索过程。
2、 根据权利要求 1所述的终端自动找网方法, 该方法还包括:
所述终端在执行所述搜索过程之前, 执行小区频点的保存过程, 该小区 频点的保存过程包括:
每当终端成功注册到一小区时, 终端保存所述小区的频点;
终端从网络侧定期下发给终端的系统消息中获取所述小区的邻小区频 点;
终端保存所述邻小区频点。
3、 根据权利要求 1所述的终端自动找网方法, 其中, 可用的小区是指小 区满足小区选择 S准则, 且该小区所属的 PLMN与终端选择的 PLMN—致。
4、 根据权利要求 1-3中任一项所述的终端自动找网方法, 其中, 所述终 端在已保存的小区频点中, 针对每个已注册的小区频点执行搜索过程的步骤 包括:
所述终端在已保存的小区频点中, 针对每个已注册的小区频点按照注册 的先后顺序依次执行所述搜索过程。
5、根据权利要求 1-3中任一项所述的终端自动找网方法,该方法还包括: 在已保存的小区频点中未找到可用的小区时, 在终端支持的所有频点中 执行所述搜索过程。
6、 根据权利要求 5所述的终端自动找网方法, 该方法还包括: 当所述终端为多模终端时, 若在当前网络制式下未找到可用的小区, 则 按照网络制式的优先级在下一网络制式下搜索可用的小区。
7、 一种终端自动找网装置, 包括搜索模块, 其中:
所述搜索模块设置成: 在终端已保存的小区频点中针对每个已注册的小 区频点执行如下搜索操作:
在所有已注册的小区频点中选择一个小区频点作为当前频点, 在当前频 点下搜索是否有可用的小区, 若有, 则找到可用的小区; 否则在当前频点对 应的邻小区频点中搜索是否有可用的小区, 若有, 则找到可用的小区, 否则 将下一个已注册的小区频点作为当前频点执行所述搜索操作。
8、根据权利要求 7所述的终端自动找网装置, 所述装置还包括预存储模 块, 其中:
所述预存储模块设置成: 每当终端成功注册到一小区时, 保存所述小区 的频点; 还从网络侧定期下发给终端的系统消息中获取所述小区的邻小区频 点, 并保存所述邻小区频点。
9、 根据权利要求 7所述的终端自动找网装置, 其中, 可用的小区是指小 区满足小区选择 S准则, 且该小区所属的 PLMN与终端选择的 PLMN—致。
10、 根据权利要求 7-9 中任一项所述的终端自动找网装置, 其中, 所述 搜索模块设置成按照如下方式在已保存的小区频点中, 针对每个已注册的小 区频点执行搜索过程:
在已保存的小区频点中, 针对每个已注册的小区频点按照注册的先后顺 序依次执行所述搜索过程。
11、 根据权利要求 7-9 中任一项所述的终端自动找网装置, 其中, 所述 搜索模块还设置成:
在已保存的小区频点中未找到可用的小区时, 在终端支持的所有频点中 执行所述搜索过程。
12、 根据权利要求 11所述的终端自动找网装置, 其中, 所述搜索模块还 设置成:
当所述终端为多模终端时, 若在当前网络制式下未找到可用的小区, 则 按照网络制式的优先级在下一网络制式下搜索可用的小区。
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