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Timing method for searching GSM frequency correcting channel in CDMA 2000 system

A frequency correction channel and timing technology, used in code division multiplexing systems, wireless communications, multiplexing communications, etc., can solve the problem of not specifically considering the FCCH search process, etc., to achieve easy design, fewer parameters, and search results. fast effect

Inactive Publication Date: 2004-04-28
BEIJING SAMSUNG TELECOM R&D CENT +1
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Problems solved by technology

[0024] Obviously, the existing standards do not give any definition for GSM search, let alone consider the search process for FCCH

Method used

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  • Timing method for searching GSM frequency correcting channel in CDMA 2000 system
  • Timing method for searching GSM frequency correcting channel in CDMA 2000 system
  • Timing method for searching GSM frequency correcting channel in CDMA 2000 system

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Embodiment Construction

[0036] In order to solve the problem that the existing CDMA2000 physical layer standard does not support FCCH search of adjacent GSM cells, the present invention is proposed. The present invention is a complete search process, but for the convenience of narration, it can be decomposed into two aspects for illustration:

[0037] 1. Tentative search methods

[0038] First of all, it should be pointed out that the CDMA2000 standard stipulates that the base station does not know the search and measurement actions performed by the mobile phone, so it cannot provide corresponding information to the mobile phone. The most important thing is the relative timing relationship between the GSM multiframe and the CDMA2000 service frame. . As a result, the mobile phone is "blind" when searching for the GSM FCCH, that is, it does not know where the GSM FCCH is relative to the CDMA frame on its traffic channel.

[0039] In other words, when the mobile phone opens the search window (stops th...

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Abstract

A timing method for search for GSM frequency correction channels from CDMA2000 system includes: setting a search window in every CDMA2000 service frame to search for small community FCCH adjacent to GSM, if it is successful, the search is finished, if not, the search is restarted. When width of search window d is the same, the needed numbers of the search windows are the least, influence to system performance is the smallest and needed search time is the shortest by this inverted timing method.

Description

technical field [0001] The invention relates to mobile communication, in particular to a timing method for searching a GSM frequency correction channel from a CDMA2000 system. Background technique [0002] The Global System for Mobile Communications (GSM for short) is a second-generation digital mobile communication system widely used all over the world. CDMA2000 is a third-generation mobile communication technology and system mainly researched and developed by Qualcomm. Both are widely used, but for historical reasons the two are not compatible with each other. Therefore, so far, mobile phones that only support GSM operation cannot roam into CDMA2000 networks, and vice versa. [0003] In order to enable the dual-mode mobile phone supporting GSM / CDMA2000 to roam from the CDMA2000 network to the GSM network, the dual-mode mobile phone must complete a series of actions such as inter-system search, measurement and switching. [0004] In the existing CDMA2000 physical layer s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W48/12H04W88/06
CPCH04W48/12H04W88/06
Inventor 田光照李小强李炫又
Owner BEIJING SAMSUNG TELECOM R&D CENT
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