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System frame number detection method and device for long term evolution LTE system

A system frame number and detection method technology, applied in the field of wireless communication, can solve the problems of high complexity, high terminal power consumption, low efficiency, etc., and achieve the effects of improving efficiency, short detection, and reducing power consumption

Active Publication Date: 2011-12-07
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the terminal receives a complete TTI of PBCH data, and uses the reverse signal processing process of the transmitter to detect the PBCH to determine the system frame number, but this method has low processing efficiency, high complexity and terminal power. High consumption

Method used

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  • System frame number detection method and device for long term evolution LTE system
  • System frame number detection method and device for long term evolution LTE system
  • System frame number detection method and device for long term evolution LTE system

Examples

Experimental program
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Effect test

Embodiment approach 1

[0055] Implementation mode 1: Single wireless frame detection system frame number scheme, the process is as follows Figure 6 As shown, the specific steps include:

[0056] 101) The terminal receives a time-domain signal of the first subframe in a radio frame. The CP is removed from the time domain signal, and after OFDM demodulation, the center 72 subcarriers of the first 4 OFDM symbols of slot#1 on the subframe are the PBCH data and corresponding reference signals. Then, the data A to be descrambled is obtained through the steps of resource unit mapping, channel estimation, signal detection and QPSK demodulation. For regular CP, the length of data A is 480; for extended CP, the length of data A is 432;

[0057] 102) Generate a scrambling code sequence C of one TTI. For a regular CP, the length of the scrambling code sequence C is 1920; for an extended CP, the length of the scrambling code sequence C is 1728. Divide the scrambling code sequence C into four segments, which ...

Embodiment approach 2

[0064] Implementation Mode 2: Multiple wireless frames are combined to detect the frame number scheme of the system, and the process is as follows Figure 7 As shown, the specific steps include:

[0065] 201) The terminal receives a time-domain signal of a first subframe in a radio frame. The CP is removed from the time domain signal, and after OFDM demodulation, the center 72 subcarriers of the first 4 OFDM symbols of slot#1 on the subframe are the PBCH data and corresponding reference signals. Then, the data A to be descrambled is obtained through the steps of resource unit mapping, channel estimation, signal detection and QPSK demodulation. For regular CP, the length of data A is 480; for extended CP, the length of data A is 432;

[0066] 202) Generate a TTI scrambling code sequence C. For a regular CP, the length of the scrambling code sequence C is 1920; for an extended CP, the length of the scrambling code sequence C is 1728. Divide the scrambling code sequence C into...

Embodiment approach 3

[0072] Embodiment 3: The frame number scheme of a single radio frame and multiple radio frames combined with a hybrid detection system. The specific implementation steps include:

[0073]301) The terminal receives a time-domain signal of a first subframe in a radio frame. The CP is removed from the time domain signal, and after OFDM demodulation, the center 72 subcarriers of the first 4 OFDM symbols of slot#1 on the subframe are the PBCH data and corresponding reference signals. Then, the data A to be descrambled is obtained through the steps of resource unit mapping, channel estimation, signal detection and QPSK demodulation. For regular CP, the length of data A is 480; for extended CP, the length of data A is 432;

[0074] 302) Generate a TTI scrambling code sequence C. For a regular CP, the length of the scrambling code sequence C is 1920; for an extended CP, the length of the scrambling code sequence C is 1728. Divide the scrambling code sequence C into four segments, wh...

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Abstract

The invention relates to the field of wireless communication, and in particular relates to a method and device for detecting a system frame number of a long-term evolution (LTE) system. The method comprises the following steps of: equally dividing a scrambling sequence C of a TTI (transmission time interval) into four sections by using the self-decoding characteristic of PBCH (physical broadcast channel) data of a wireless frame, respectively descrambling with the PBCH data generated in the first step, after matching a descrambling rate, selecting whether to adopt a merge algorithm or not according to a condition, and then carrying out channel decoding and CRC (cyclic redundancy check), judging whether to continuously receive the data of a next wireless frame or not according to a CRC result, and determining the system frame number according to the adopted scrambling sequence. The device comprises a receiving module (10), a signal processing module (20) and an adjudicating module (30). The invention can improve the efficiency of a terminal in the blind check of the PBCH, decreases power consumption, and determines the system frame number as quickly as possible, so as to be convenient to the read of a subsequent system message.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method and device for detecting a system frame number of a long term evolution LTE system. Background technique [0002] In order to meet people's increasing demand for data services, the Third Generation Partnership Project (The 3 rd The generation Partnership Project (3GPP for short) launched the 3GPP "Long Term Evolution Project", referred to as 3GPP LTE (Long Term Evolution), which aims to provide stronger data service support through the evolving third-generation mobile communication 3G system, and provide users to provide better service. [0003] The LTE TDD system frame structure defined in 3GPP specification TS 36.211 is as follows: figure 1 As shown, the LTE FDD system frame structure is as follows figure 2 shown. [0004] The wireless frame length of the LTE TDD system is 10ms, corresponding to 307200Ts. Each radio frame is further divided into two 5ms half...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/06
Inventor 黄宗治杨萍冯侨沈静王茜竹
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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