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Re-option of public land mobile network

A public land mobile and network technology, applied in electrical components, wireless communication, etc., can solve problems such as long reselection time, business impact, unusable videophone, etc., and achieve the goal of shortening access time and accelerating network reselection time Effect

Inactive Publication Date: 2006-05-31
HUAWEI TECH CO LTD
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Problems solved by technology

[0005] However, since the current PLMN reselection search cycle set in the protocol is generally 6 minutes to 8 hours, that is, the shortest time for users who switch or roam to the GSM network to return to the 3G network is 6 minutes. The simple voice service of GSM can be used, so some bandwidth-based characteristic services of 3G will be affected. For example, the videophone based on 3G network will not be available; the packet domain data service attached to the GPRS network can only use GPRS The actual service rate, not the high-speed data service of WCDMA packet data service, etc.
[0006] Therefore, the HPLMN reselection method in the prior art will have a certain impact on 3G services due to the long reselection time

Method used

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  • Re-option of public land mobile network

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[0050] The first embodiment: In this embodiment, firstly, the basic parameters of the WCDMA mobile operator are permanently recorded in the USIM. The basic parameters include basic information such as frequency points. In the prior art, these basic parameters are temporarily saved. If the user shuts down the phone for a long time, the USIM will clear the stored information. When the terminal is powered on again, the MS will scan all available frequency points in the current area, and then Once the access attempt is made, the present invention adopts the method of permanently recording the parameters necessary for selecting the PLMN network, so that the terminal does not need to try all the PLMNs in the current area after the hot reset, but according to the frequency point information recorded in the USIM The corresponding frequency point cut-in attempt is directly performed, thereby shortening the access time.

[0051] As mentioned above, since the search period in the prior ...

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Abstract

The method includes following steps: records HPLMN (home public land mobile network) parameters of terminal in USIM (universal subscriber identity module); then sets timer in UDIM; when the preset time arrives, in term of interaction message between the terminal device and USIM, decides if current PLMN (public land mobile network) is identical; if not, in term of HPLMN parameter, returns to HPLMN where terminal is at. With setting timer in USIM, in term of time limit that can be accepted by terminal, resets a shorter searching period, and then in term of HPLMN relevant message saved in USIM, returns to HPLMN.

Description

technical field [0001] The present invention relates to a mobile communication network, in particular to a network reselection technology when multiple public land mobile networks overlap and cover, and in particular to a method for a terminal to return to the public land mobile network to which it belongs. Background technique [0002] In the current mobile communication network, the mobile network of the mobile operator is called PLMN (PublicLand Mobile Network, public land mobile network), and its unique identifier PLMNID is composed of MCC (Mobile Country Code, mobile country code) and MNC (Mobile Network Code, Mobile Network Code) composition. MCC generally contains three numbers, which are used to uniquely identify the country code where the mobile terminal is located. For example, 460 is used to identify China; MNC generally uses two to three numbers to identify the mobile network selected by the mobile terminal. MNCs are different. The network whose MCC and MNC of ...

Claims

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Application Information

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IPC IPC(8): H04W36/14
Inventor 牛红亮
Owner HUAWEI TECH CO LTD
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