Switch synchronization method for asynchronous CDMA system

Abstract

Using matrix list of time difference and timestamp between Tcell matrix list in NodeB and NodeB stored in each local memory of RNC, the invention saves relative synchronization information. Thus, when there is no synchronization information reported from UE, switch synchronization can be carried out by using saved information. The invention guarantees switching success ratio and switching performance.

Description

technical field [0001] The invention relates to the communication field, in particular to the switching technology of an asynchronous code division multiple access system. Background technique [0002] With the increasingly mature technology, the practical prospect of the third generation mobile communication service is just around the corner. It has a similar network structure to the second-generation mobile communication network, and both of them can be divided into two parts: Radio Access Network ("RAN" for short) and Core Network ("CN" for short). [0003] Wherein, the RAN is mainly composed of a Mobile Station (Mobile Station, "MS" for short), a Node B (NodeB), and a Radio Network Controller (Radio Network Controller, "RNC" for short). In a mobile communication system, NodeB is also called a base station. Each NodeB covers a certain area with a diameter ranging from tens of meters to more than ten kilometers. It is responsible for the access of mobile phone signals in ...

AI Technical Summary

Problems solved by technology

[0012] In practical applications, the above solution has the following problems: in the current actual network operation, because the UE does not detect the frame header, not every UE can measure the synchronization information of the target cell, resulting in failure of synchronization

The same-frequency measurement will basically report synchronization information according to the synchronization indicator bit, but as mentioned above, there is also the possibility that synchronization information cannot be reported; inter-frequency measurement will basically not report synchronization information, because only dual-receiver UEs can report synchronization information, and For a single receiver, the compressed mode needs to be enabled, but the system frame number (System Frame Number, referred to as "SFN") of the inter-frequency cell cannot be read in the compressed mode

[0014] The main reason for this situation is that the UE may not be able to measure the synchronization information of the target cell

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