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Downlink synchronous method, equipment and system applied to long-term evolution

A long-term evolution and symbolic technology, applied in the field of communication, can solve the problems of increasing system operating burden and LTE system overhead, and achieve the effects of improving timing performance, reducing operating burden, and saving overhead

Active Publication Date: 2010-11-24
合肥东芯通信股份有限公司
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Problems solved by technology

[0015] In view of this, the present invention provides a method, device and system applied to LTE downlink synchronization, which solves the problem of increasing the overhead of the LTE system and increasing the system operation burden caused by the prior art

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  • Downlink synchronous method, equipment and system applied to long-term evolution
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  • Downlink synchronous method, equipment and system applied to long-term evolution

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Embodiment Construction

[0064] For the sake of reference and clarity, the technical terms, abbreviations or abbreviations used in the following are summarized as follows:

[0065] LTE: Long Term Evolution system, long-term evolution system;

[0066] TDD: Time Division Duplexing, time division duplex;

[0067] FDD: Frequency Division Duplex, frequency division duplex;

[0068] CP: Cyclic prefix;

[0069] OFDM: Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing

[0070] PSS symbol and SSS symbol: are synchronization symbols in the LTE frame, and have different positions in the LTE frame according to different modes;

[0071] FFT: fast Fourier transform, fast Fourier transform.

[0072] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invent...

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Abstract

The invention discloses a downlink synchronous method, downlink synchronous equipment and a downlink synchronous system applied to long-term evolution. The method comprises the following steps of: acquiring a maximum joint correlation value in SSS symbols corresponding to multiple modes by using a determined grouping detection range of a PSS symbol, determining that the mode corresponding to the maximum joint correlation value is a current mode, determining the PSS symbol by using a timing point of the SSS symbols corresponding to the acquired maximum joint correlation value and the current mode, and acquiring a sector number in the PSS symbol; and performing frequency offset compensation on the PSS symbol and the SSS symbols, then transforming the SSS symbols to a frequency domain, descrambling the SSS symbols according to the sector number, and acquiring LTE frame timing and a cell group number in the SSS symbols. The method saves the overhead of the system and determines the running load of the system by detecting the corresponding SSS symbols in four modes in the grouping detection range of the PSS symbol, determining one mode as the current mode and then performing related detection aiming at the mode.

Description

Technical field [0001] The present invention relates to the field of communication technology, and more specifically to a method, equipment and system for downlink synchronization applied to LTE (Long Term Evolution system, Long Term Evolution system). Background technique [0002] In the current field of communication technology, the LTE system is widely regarded as a quasi-4G wireless communication system. It has a transmission rate of 100M in downlink and 50M in uplink, and it also supports higher mobile speeds (about 350km / h) and larger than 3G. The cell coverage radius (about 100 kilometers) can support 200 users online at the same time per cell. In the process of cell search, it is necessary to identify and obtain cell downlink synchronization to provide necessary basis for cell search. See attached figure 1 With attached figure 2 , Is a typical LTE frame structure in downlink synchronization in the prior art. among them, figure 1 It is FDD (Frequency Division Duplex, Fr...

Claims

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Application Information

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IPC IPC(8): H04W56/00H04L25/02H04B1/707
Inventor 李江鹏张国松吴齐发唐相国
Owner 合肥东芯通信股份有限公司
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