TD-SCDMA format Femtocell air interface synchronization method

Abstract

The invention relates to the technical field of wireless communication, in particular to a TD-SCDMA format Femtocell air interface synchronization method, which comprises the following steps: 1, acquiring a corresponding macro base station neighbor list through an accessed Femto gateway; 2, sequencing the neighboring macro base stations in the macro base station neighbor list, and selecting a macro base station of which the signal quality is high as a synchronous signal source base station if initial synchronous access; 3, performing initial synchronous access by means of two-stage synchronization, wherein rough synchronization is performed by characteristic window matching at the first stage and fine synchronization is performed by filter related detection at the second stage, so that the initial synchronous access can be accomplished quickly; and 4, periodically detecting the synchronous signal source base station, computing self frequency error, correcting the frequency error by using the time regulating unit to maintain the synchronization, and monitoring if the synchronous signal source base station steps out at the same time. In the method, the synchonizaiton cost is low; and the synchronization requirement for the indoor application of a large batch of FemtoCells can be met on the premise of low cost.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method for synchronizing the FemtoCell air interface of the TD-SCDMA standard. Background technique [0002] In the 3G era, the role of FemtoCell in solving indoor coverage has been widely recognized by operators. Like conventional macro base stations, the most important technology for commercial deployment of FemtoCell is how to realize the synchronization problem between a large number of FemtoCell base stations Once the synchronization is lost, it will cause strong signal interference, and in severe cases, mobile phone users cannot access the network at all. At present, operators mainly have the following solutions for solving base station synchronization. [0003] 1. GPS-based synchronization solution [0004] In order to realize the synchronization function of the base station, the GPS receiver needs to receive at least 4 satellite signals in order to real...

AI Technical Summary

Problems solved by technology

The synchronization interval is usually 1, 2, 8, 16 and 64 seconds. If it is too long, it cannot guarantee sufficient synchronization accuracy, and if it is too short, it will increase the burden of network transmission.

[0011] This synchronization method is only suitable for networks with fewer intermediate routing nodes and less jitter in the bearer network

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