Multimode multi-card mobile terminal and mobility management method thereof

Abstract

The invention discloses a mobility management method of a multimode multi-card mobile terminal. And the SIM card I is switched from the current cell A to the cell B after being switched in the system,or switched between the systems or switched by the CCO during the service in the connected state. And the first SIM card resides and is registered in the current cell B. Judging whether the rest SIMcards have the same PLMN information as the SIM card or not; if yes, judging whether the second SIM card and the first SIM card are in the same mobile communication network mode or not; and if so, thesecond SIM card directly resides and is registered in a registered cell B of the first SIM card. And if not, the SIM card II changes the mobile communication network mode to be the same as that of the SIM card I, and then the SIM card II directly resides and registers in a registered cell B of the SIM card I. And the rest SIM cards try to search for cells which have already resided or are storedbefore, and if the remaining SIM cards cannot find the cells, network searching is carried out according to the full frequency band until a proper cell is found for residing, or an emergency residingstate is entered, or an OOS state is entered. According to the invention, the second SIM card can quickly reside in the registered cell without searching a network.

Description

Technical field [0001] This application relates to a mobile communication technology, in particular to a method for mobility management of a multi-mode and multi-card mobile terminal. Background technique [0002] The development of mobile communication technology started from the first-generation analog cellular mobile communication system to the second-generation Global System for Mobile communication (GSM), which provided voice services and low-rate data services under good network coverage conditions. The third-generation Universal Mobile Telecommunications System (UMTS) further provides more types of broadband multimedia services. The introduction of LTE (Long Term Evolution, long-term evolution technology) brings mobile communication technology into the 4G era. [0003] 4G multi-mode (multi mode) mobile terminals (UE, User Equipment) that support GSM, UMTS, and LTE at the same time have been widely used. However, 4G multi-mode mobile terminals still cannot meet the needs of ...

AI Technical Summary

Problems solved by technology

Even if the two SIM cards belong to the same mobile communication operator, the change of the serving cell of SIM card two does not effectively utilize the mobility management information of SIM card one, which includes intra-system handover (Intra-RAT HO), Inter-system handover (Inter-RAT HO), CCO (Cell Change Order, cell change order), cell reselection and other information; therefore, the network search time of SIM card 2 is too long, the call completion rate is low, and the network is suddenly disconnected, etc. make the user experience poor

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