| 摘要 |
PURPOSE: A shared transmission method of a down-link common channel is provided to increase a system capacity by reducing repeated transmission of the same data when a CDMA signal of various chip rates is transmitted by using a limited frequency band by rendering the CDM signal of various chip rate transmitted from the same cell or from a base station to share a synchronous channel(SCH), a primary common control physical channel(P-CCPCH) and a common pilot channel(CPICH) and be transmitted thereto. CONSTITUTION: A 7.68Mcps mobile terminal performs a cell searching process by using a 3.84Mcps synchronous channel, obtains frame synchronization with a primary scrambling code of 3.84Mcps, and is converted to the frame synchronization with the primary scrambling code of 7.68Mcps. Subsequently, the 7.68Mcps mobile terminal obtains information on a cell from a primary common control physical channel(P-CCPCH) of 3.84Mcps and estimates channel information from the CPICH of 3.84Mcps. The 7.68Mcps mobile terminal receives the remaining common physical channel of 7.68Mcps which has not been shared with the 3.84Mcps and a dedicated physical channel by using a 7.68Mcps demlodulator. Since a cell searching process of 3.84Mcps has a less complexity than the cell searching process of 7.68Mcps, in order to reduce the complexity of the 7.68Mcps mobile terminal, the cell searching result of 3.84Mcps is converted to the cell searching result of 7.68Mcps. In this respect, the 3.84Mcps mobile terminal needs to receive the 3.84Mcps signal, while has no difference in the conventional method. Meanwhile, in the case of the 7.68Mcps mobile terminal should simultaneously receive the 3.84Mcps signal and the 7.68Mcps signal. In case that the 3.84Mcps signal and the 7.68Mcps signal use the same carrier frequency, since a radio frequency element can be mostly shared, the structure of the mobile terminal can be simplified. Meanwhile, if the carrier frequencies of the 3.84Mcps signal and the 7.68Mcps signal are different, the radio frequency element is implemented complicated.
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