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Frequency point scanning method and device for TD-SCDMA system

A TD-SCDMA, frequency scanning technology, applied in transmission systems, transmission monitoring, electrical components, etc., can solve the problems of large main carrier frequency bandwidth and large number of frequency points.

Active Publication Date: 2014-06-04
MORNINGCORE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And because TD-SCDMA does not distinguish between uplink and downlink frequency bands, it may be configured with a relatively large bandwidth of the main carrier frequency and a large number of frequency points, resulting in considerable time overhead for performing a round of scanning of each frequency band

Method used

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  • Frequency point scanning method and device for TD-SCDMA system
  • Frequency point scanning method and device for TD-SCDMA system
  • Frequency point scanning method and device for TD-SCDMA system

Examples

Experimental program
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Effect test

example 1

[0111] Starting from the first carrier frequency, measure the RSSI of each carrier frequency one by one.

[0112] That is, for the A frequency band (2010~2025MHz), it is required to measure the RSSI measurement values ​​of 68 carrier frequencies UARFCN=10054, 10055, 10056..., 10121.

example 2

[0114] Starting from the first carrier frequency, perform the RSSI measurement of the next carrier frequency every K carrier frequencies (the value of K can be 1, 2, 3, 4, etc.).

[0115] Taking K=1 as an example, for the A frequency band (2010~2025MHz), it is required to measure the RSSI measurement values ​​of 35 carrier frequencies UARFCN=10054, 10056, 10058..., 10118, 10120, 10121.

[0116] Then, the air interface RSSI strengths of the other 33 carrier frequencies for which no RSSI measurement is performed can be estimated by using the RSSI measurement values ​​of the left and right adjacent carrier frequencies.

[0117] An example estimation algorithm is:

[0118] aerial_RSSI(m)=[aerial_RSSI(m-1)+aerial_RSSI(m+1)] / 2

[0119] Finally, in step 717, frequency point power sorting of the entire frequency band is performed.

[0120] The implementation effect of the frequency point sorting control strategy of the present invention can be referred to Figure 9A , 9B , 9C, which...

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Abstract

The invention relates to a frequency point scanning method and device for a TD-SCDMA system. The method comprises the steps that a carrier frequency set which needs scanning is selected in a target frequency band; the first round of frequency point scanning is conducted on all carrier frequencies in the carrier frequency set. The first round of frequency point scanning comprises the steps that an initial AGC value is used for setting of a suggested AGC value of the first carrier frequency; the first carrier frequency is scanned, and a base band RSSI value, an air interface RSSI value and an expected AGC value of the first carrier frequency are calculated; the expected AGC value of the first carrier frequency is used for setting of a suggested AGC value of the second carrier frequency, wherein the second carrier frequency is within a preset frequency point interval of the first carrier frequency, the preset frequency point interval is large enough so that the deviation between the second carrier frequency and the air interface RSSI value of the first carrier frequency cannot exceed acceptable deviation; the second carrier frequency is scanned, and a base band RSSI value and an expected AGC value of the second carrier frequency are calculated. In this way, scanning of the other carrier frequencies in the carrier frequency set is completed.

Description

technical field [0001] The invention relates to the cell search in the TD-SCDMA system, in particular to the frequency point scanning method and device in the frequency point sorting of the TD-SCDMA system. Background technique [0002] The frame structure of TD-SCDMA system is as follows: figure 1 shown. Code channels 1 and 2 of time slot TS0 carry PCCPCH (Primary Common Control Physical Channel), and downlink pilot time slot DwPTS carries SYNC_DL. Time slots TS1 to TS6 are service time slots, carrying service data. A TD-SCDMA radio frame is 10ms long and divided into two 5ms subframes. The structures of these two subframes are exactly the same. [0003] Such as figure 2 As shown, each subframe is further divided into 7 regular time slots and 3 special time slots with a length of 675us. The three special time slots are DwPTS (downlink pilot time slot), GP (guard time slot) and UpPTS (uplink pilot time slot). Of the 7 regular time slots, TS0 is always allocated to th...

Claims

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Application Information

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IPC IPC(8): H04W24/08H04W52/52H04B17/00H04B17/382
Inventor 洪素娟
Owner MORNINGCORE TECH CO LTD