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Control method, movable station and mobile communication system for searching near district

A technology of a mobile communication system and a control method, applied in the field of area reselection control, capable of solving problems such as increased battery consumption

Inactive Publication Date: 2004-12-15
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, since the quality measurement of the pilot channel is carried out irrespective of the reception of the paging signal, the mobile station must operate its receiver, which presents the problem of increased battery consumption of an essential resource of the mobile station

Method used

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  • Control method, movable station and mobile communication system for searching near district
  • Control method, movable station and mobile communication system for searching near district
  • Control method, movable station and mobile communication system for searching near district

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] Image 6 is a block diagram showing the configuration of a mobile station to which the present invention is applied.

[0096] The mobile station 500 includes a mobile station transceiver 502, a user interface 504, an adjacent base station information acquisition and processing unit 506, a common controller 508, a cell search controller 510, a memory 512, an antenna 514 and a bus 516. in as in Image 6 In the mobile station shown in , only the parts relevant to the present invention are shown.

[0097] The mobile station transceiver 502 demodulates user information and control signals transmitted from the base station after radio frequency modulation by the base station, and transmits the user signals and control signals after their encoding and modulation. Mobile station transceiver 502 is connected to antenna 514 and user interface 504 .

[0098] Common controller 508 performs overall control of the mobile station.

[0099] According to neighboring base station in...

no. 2 example

[0119] Then refer to Figure 12-15 A second embodiment of the present invention is described.

[0120] Figure 12 is a block diagram showing the configuration of a mobile station to which the present invention is applied.

[0121] Figure 12 Only the parts of the mobile station relevant to the present invention are shown.

[0122] The mobile station 300 includes a radio signal transceiver 302, a traffic channel transceiver 304, a user interface 306, a pilot channel receiver 308, a pilot channel reception quality measurement controller 310, a paging signal receiver 312 , a common controller 314 , a memory 316 , an antenna 318 and a common bus 320 .

[0123] The radio signal transceiver 302 connected to the antenna 318 is a device for receiving user information and control signals transmitted from the base station after radio frequency modulation, and for transmitting user information related to voice or data transmitted from the mobile station to the base station. informat...

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Abstract

A control method of searching for a neighboring cell of a mobile station communicating with a base station is provided in a direct sequence CDMA mobile communication system which transmits information by carrying out double modulation using a first spreading code group and a second spreading code. The first spreading code group includes spreading codes that have a same repetition period as an information symbol period and are used in common by the base stations, and the second spreading code has a repetition period longer than the information symbol period. The base stations are assigned different second spreading codes. The control method stores at least one second spreading code and its phase into a first table, which second spreading code corresponds to a perch channel whose second spreading code and phase are known; stores a second spreading code used by a neighboring base station into a second table; searches for a perch channel whose second spreading code and phase are unknown; and searches for a perch channel whose second spreading code and phase are known. The neighboring cell search method can save the power consumption and time required for the mobile station to carry out the cell search with preventing an increase in the total cost of the system.

Description

technical field [0001] The present invention relates to a mobile communication system performing multiple access using spread spectrum, and in particular to a neighboring cell search method applied to handover control during communication or during an idle mode in the system and a mobile station comprising the system area and then select the controls. Background technique [0002] A mobile communication system like the popular mobile phone system provides its services by dividing the entire service area into relatively small radio areas called cells. as in figure 1 As shown in , such a system includes a plurality of base stations 111 for covering divided radio areas (cells), and mobile stations 112 for communicating with the base stations by establishing radio channels. [0003] Direct Sequence CDMA (DS-CDMA) is a scheme for multiple users that uses the same radio frequency band to communicate by sending information through a secondary modulation that spreads a conventiona...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707H04W36/00H04W36/08H04W36/12H04W36/34H04W48/12H04W48/16H04W48/20H04W52/02H04W68/00H04W68/02
CPCH04W52/02H04B1/70735H04W36/0083H04W52/0216H04W48/16Y02B60/50H04B1/7083H04W48/20H04B2201/70702H04W36/0085Y02D30/70H04W36/00835
Inventor 石川义裕尾上诚藏柚木一文东明洋
Owner NTT DOCOMO INC