Frequency point sequencing method and system in terminal cell search
A cell search and sorting method technology, applied in the field of cell search, can solve the problem of long time consumption, and achieve the effect of reducing the number of frequency point measurements and the time spent
Active Publication Date: 2013-06-19
LEADCORE TECH
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The disadvantage of this method is that it takes one subframe (5ms) to measure the power of each frequency point, and it takes a long time to traverse all frequency points
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[0026] The following embodiments of the present invention will describe a frequency point ranking method in a cell search performed by a mobile communication terminal. As an example, the mobile communication terminal may include a portable electronic device with a mobile communication module, such as a mobile phone and a tablet computer. In the following embodiments, the implementation process of the present invention will be described by taking a TD-SCDMA system as an example, but it is understood that the present invention can be implemented in other mobile communication systems, such as WCDMA systems.
[0027] figure 1 The frame structure of the TD-SCDMA system is shown. like figure 1 As shown, code channels 1 and 2 of time slot TS0 carry PCCPCH, and DwPTS (downlink pilot time slot) carries SYNC_DL. Time slots TS1 to TS6 are service time slots, carrying service data. TD-SCDMA cells must send signals on TS0 and DwPTS.
[0028] A TD-SCDMA radio frame is 10ms long and div...
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The invention relates to a frequency point sequencing method and a system in terminal cell search so as to reduce time consumed for power measurement in frequency point sequencing. The method includes the following steps: a series of to-be-searched frequency points arranged according to frequency are divided into a plurality of frequency point groups, each frequency point group comprises a plurality of adjacent frequency points, and one of the plurality of adjacent frequency points is used as the representing frequency point of the frequency point group; the power of the representing frequency point in each frequency point group is measured and used as the group power of the frequency point group; the plurality of frequency point groups are sequenced according to the group power; at least one candidate frequency point group with the largest group power is selected from the plurality of frequency point groups; the power of frequency points except the representing frequency point in each candidate frequency point group is measured; the group power of the non-candidate frequency point groups in the plurality of frequency point groups is given to other frequency points except the representing frequency points in the non-candidate frequency point group; and each frequency point is sequenced according to the power.
Description
technical field [0001] The present invention relates to mobile communication systems, and more particularly, to cell search in mobile communication systems. Background technique [0002] In a mobile communication system, after initial power-on, a mobile terminal (User Equipment, UE) needs to search for possible existing cells and select an appropriate cell to log in. Only after the UE logs in to the cell, it can obtain more detailed information of the cell and obtain the information of neighboring cells, and only after logging in to the cell, can it monitor paging or initiate a call. The process from power-on search to logging on to a suitable cell is usually defined as a cell initial search process. [0003] Taking the TD-SCDMA system as an example, in the initial stage of cell search when the terminal is turned on, the power of each frequency point needs to be measured, and then sorted, and the subsequent process of cell search starts from the frequency point with the str...
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Inventor 郑未刘玉林洪素娟
Owner LEADCORE TECH