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Method for determinnig addressed cell of mobile station and CDMA communication system

A mobile communication system and mobile station technology, applied in the field of mobile station equipment, can solve the problems of long activation time of mobile stations

Inactive Publication Date: 2004-03-24
NTT MOBILE COMM NETWORK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since this reception level measurement process requires a time as long as multiple multiples of the spreading code cycle, when the number of spreading codes increases, there arises a problem that the active time of the mobile station becomes longer

Method used

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  • Method for determinnig addressed cell of mobile station and CDMA communication system
  • Method for determinnig addressed cell of mobile station and CDMA communication system
  • Method for determinnig addressed cell of mobile station and CDMA communication system

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Embodiment Construction

[0059] The first embodiment of the cell selection scheme in the CDMA mobile communication system according to the present invention will be described in detail below with reference to FIG. 5 to FIG. 8 .

[0060] FIG. 5 shows the configuration of base station equipment in the CDMA mobile communication system as described in the first embodiment. The base station equipment 1 shown in Fig. 5 comprises following parts: GPS antenna 10; The GPS receiver unit 11 that links to each other with GPS antenna 10; The reference time scale generation unit 12 that links to each other with GPS receiver unit 11; The extension modulation unit 13; the radio unit 14 connected with the extension modulation unit 13; the antenna 15 connected with the radio unit 14; the coding unit 18 connected with the extension modulation unit 13; the control unit connected with the extension modulation unit 13 and the coding unit 18 17; and a memory 16 connected to the control unit 17.

[0061] The GPS receiver un...

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Abstract

A cell selection scheme in a CDMA mobile communication system which is capable of shortening the cell selection processing time while constructing a mobile communication system with a practically feasible base station configuration. In a CDMA mobile communication system, first type base stations share a common reference timing, and second type base stations do not share the common reference timing. A mobile station receives these pilot channels and judges a located cell of the mobile station according to receiving levels, pilot channel spread codes and spread code phases of received pilot channels.

Description

technical field [0001] The present invention relates to a cell selection scheme in a CDMA (Code Division Multiple Access) mobile communication system and a base station device and a mobile station device suitable for a cell selection scheme. Background technique [0002] In the CDMA mobile communication scheme, a service area is divided into a plurality of unit areas called cells, and a base station is installed in each cell so that a mobile station located in a cell within the service area performs communication with the cell through a radio channel. The communication of the base station installed in the cell. [0003] Each base station is always transmitting a pilot channel, and a single pilot channel can be identified when received by a mobile station. For example, in FDMA systems, different frequencies are used as different pilot channels. In a CDMA system, individual pilot channels become identifiable by using different spreading codes for different pilot channels. ...

Claims

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Application Information

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IPC IPC(8): H04W48/12H04W48/20
CPCH04W48/20H04W48/12H04B7/26H04B1/69
Inventor 中村武宏大野公士中野悦宏尾上诚藏
Owner NTT MOBILE COMM NETWORK INC
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