Method and device for searching PLMN (Public Land Mobile Network) of TD-LTE (Time Division-LongTerm Evolution)

Abstract

The invention relates to a method and device for searching a PLMN (Public Land Mobile Network) of a TD-LTE (Time Division-Long Term Evolution), which can improve the search speed. The method comprises the following steps of: selecting an available frequency point from an LTE frequency range; acquiring synchronism information of each frequency point, blindly detecting a PDCCH (Physical Downlink Control Channel) comprising a system information-radio network temporary identification (SI-RNTI) in a largest control domain range to collect SIB1(System Information Block 1) information; then analyzing the SIB1 information to obtain a PLMN identification, and updating an available PLMN list; and after traversing all available frequency points, reporting the available PLMN list.

Description

technical field [0001] The present invention relates to a TD-SCDMA long-term evolution (TD-LTE) scheme, in particular to a PLMN search method and device for TD-LTE. Background technique [0002] During the operation of the terminal, PLMN (Public Land Mobile Network, public land mobile network) search is an important function that must be supported, that is, the terminal actively searches the surrounding network conditions without prior knowledge and prompt information, through All PLMN identifiers (PLMN_Id) are parsed, the available PLMN list (PLMN_List) is sorted out and reported to the user so as to realize the process of manual network selection. Compared with the traditional 2G / 3G access technology, an important change of TD-LTE is that the bandwidth is variable. One of the characteristics brought about by this is that the central frequency points of adjacent cells can not be restricted by the bandwidth. In the TD-LTE protocol, the minimum interval between the center fr...

AI Technical Summary

Problems solved by technology

[0020] The main disadvantage of this search method is that the PLMN search time is too long, and it is difficult for users to bear the waiting for this process. In addition, the long-term data receiving and processing also brings huge overhead of power consumption, specifically shown in:

[0021] 1. The available frequency points are not distinguished, and there are more than 1,000 possible frequency points that need to be screened, and the huge search number doubles the search time;

[0022] 2. The synchronization search process is repeated for each frequency point, resulting in serious waste of search time and power consumption

For the real frequency point of the cell, discard the existing synchronization information and search again. For the small signal arrival time difference between the cells, it is necessary to continuously receive data of more than 10ms for detection and judgment; It can only be ruled out if the first detection fails, and the time and power consumption may be greater;

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