Wireless base station clock synchronization method and system thereof, base band frame and exchange frame

Abstract

The invention provides a wireless base station clock synchronization method. The method comprises the following steps that: a frame is selected as an exchange frame from a wireless base station cluster system; the exchange frame generates a timing reference signal; the timing reference signal is coded in IQ data; the IQ data is sent to a base band frame; the base band frame recovers the timing reference signal from the IQ data, acquires a transmission time delay value of the base band frame and the exchange frame and compensates the recovered timing reference signal according to the transmission time delay value so that the compensated timing reference signal synchronizes with the timing reference signal of the exchange frame; the base band frame generates the timing reference signal which forms synchronization with itself according to the compensated timing reference signal. The invention also provides the wireless base station cluster system, the exchange frame and the base band frame. By using the method and the system, the wireless base station synchronization can be realized without increasing hardware and wiring resources.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a clock synchronization method, system, baseband frame and switching frame of a wireless base station when a plurality of wireless base station clusters share a baseband pool. Background technique [0002] For wireless base stations, wireless base stations of some standards (such as CDMA / TD-SCDMA) require absolute alignment of time phases between base stations. For wireless base stations of some standards (such as GSM / UMTS), only base station system clock frequencies are basically equal, and time phase alignment is not required. For different clock requirements of the base station, clocks can be provided to the wireless base station through different timing schemes. For wireless base stations that require time and phase synchronization, timing schemes such as GPS can be used, such as figure 1 shown. For wireless base stations that do not need time phase synchronization, c...

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Problems solved by technology

Therefore, for this kind of networking situation, the first timing scheme mentioned above can be adopted, but at the same time, it also needs to bear the unfavorable factors such as cost and engineering brought by the first timing scheme

[0005] In the prior art, there are mainly two methods for synchronization: one is to use the GPS system to serve time to the base station, so that all BBUs can be synchronized to a reference clock; the other is to add an additional clock cascading cable to connect the time phase of one BBU through the line The other BBUs are synchronized with the transmitted phase, so as to achieve phase synchronization of all BBUs in the cluster. Both methods require additional equipment or cables

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