Primary cell searching method for long term evolution (LTE) system
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A technology of cells and cell groups, applied in advanced technology, access restrictions, electrical components, etc., can solve problems affecting terminal performance, reduce the efficiency of initial cell search, etc., reduce blindness, reduce the number of times to interpret cell broadcast messages, The effect of shortened time
Active Publication Date: 2012-07-04
SPREADTRUM COMM (SHANGHAI) CO LTD
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[0028] However, there are still some problems in the existing cell initial search method with BA table. From the above process, it can be seen that the method of judging the frequency point of the cell suitable for camping is determined according to the interpretation result of the cell broadcast message. The BA table contains multiple working frequency points of the cell. The method of the prior art still has a certain degree of blindness in the process of using the frequency points in the BA table for the initial search of the cell, resulting in the possibility that the UE may perform a search on a large number of wrong frequency points. PBCH channel analysis and cell broadcast message interpretation work will take a lot of time, reduce the efficiency of the initial cell search, and thus affect the performance of the terminal
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specific Embodiment 1
[0068] The overall process of this embodiment is as follows image 3 shown.
[0069] 1. After the UE is powered on, check whether there is frequency point information saved in the BA table. If there is, perform step 2, otherwise perform step 10;
[0070] 2. The UE selects a frequency point that has not yet calculated the corresponding power value, and calculates the NID1 and NID2 of the frequency point;
[0071] The calculation method is to use the formula CELLID=3×NID1+NID2 to calculate NID1 and NID2 according to the CELLID in the frequency point information;
[0072] 3. Generate a local primary synchronization signal and a local secondary synchronization signal corresponding to the frequency point according to the NID1 and NID2;
[0073] Generate a local primary synchronization signal corresponding to the frequency point according to the cell group identifier of the frequency point;
[0074] Generate a local secondary synchronization signal 1 corresponding to the first ha...
specific Embodiment 2
[0103] The overall process of this embodiment is as follows Figure 4 shown.
[0104] 1. After the UE is powered on, check whether there is frequency point information saved in the BA table. If there is, perform step 2, otherwise perform step 8;
[0105] Steps 2~3 are identical with specific embodiment 1;
[0106] 4. The UE receives data with a length of half a radio frame on the frequency point;
[0107] 5. Carrying out sliding correlation between the local primary synchronization signal corresponding to the frequency point and the received data, to obtain a power array of primary synchronization correlation numbers corresponding to the frequency point;
[0108] 6. Carry out sliding correlation between the local secondary synchronization signal 1 and the local secondary synchronization signal 2 respectively with the received data, to obtain the secondary synchronization correlation power array 1 and the secondary synchronization correlation power array 2 corresponding to th...
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Abstract
The invention discloses a primary cell searching method for a long term evolution (LTE) system. The method comprises that: user equipment (UE) generates local primary synchronous signals and local secondary synchronous signals corresponding to each frequency point according to frequency point information stored in a BA table; for each frequency point, the UE receives data and calculates correlation power values between the local primary synchronous signal of the frequency point and the received data and between the local secondary synchronous signal of the frequency point and the received data; the UE performs subsequent timing rough synchronization, timing precise synchronization, frequency rough synchronization, wireless frame synchronization, frequency precise synchronization and cell broadcast message reading processes according to an order from greater correlation power values to lower correlation power values corresponding to each frequency point; and if a cell broadcast messageis accurately read on a selected frequency point, the UE selects a cell of the frequency point for residence. By the technical scheme provided by the invention, the blindness of frequency point selection from the BA table in a primary cell searching process is reduced, and the times for reading the cell broadcast message on a wrong frequency point by the UE can be effectively reduced, thereby shortening primary cell searching time and improving primary cell searching efficiency.
Description
technical field [0001] The present invention relates to a cell initial search technology of a mobile communication system, in particular to a cell initial search method for a long-term evolution (abbreviation, LTE) system. Background technique [0002] The LTE system is a further evolution of the third-generation mobile communication system. In the LTE system, the single carrier frequency division multiple access (SC-FDMA) technology is used in the uplink, and the orthogonal frequency division multiple access is used in the downlink. (abbreviation, OFDMA) technology. [0003] Orthogonal Frequency Division Multiplexing (abbreviated, OFDM) technology is a special multi-carrier transmission scheme, which can be regarded as a modulation technology and a multiplexing technology. The basic principle is: divide the channel into several orthogonal sub-channels, convert high-speed data signals into parallel low-speed sub-data streams, and modulate them for transmission on each sub-c...
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