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Method of perch channel transmission and cell selection in CDMA mobile communication system

A mobile communication system and pilot channel technology, applied in the direction of selection device, wireless communication, communication between multiple stations, etc., can solve the problems of reduced system capacity, increase of pilot channel transmission power and interference power, etc.

Inactive Publication Date: 2004-07-28
KOKUSA ELECTRIC CO LTD
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Problems solved by technology

[0004] Now, when the pilot channel is continuously transmitted in the CDMA mobile communication system in a method similar to that in the conventional PDC system, the interference power increases due to the comparatively large transmission power of the pilot channel, resulting in a problem that the system capacity decreases

Method used

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  • Method of perch channel transmission and cell selection in CDMA mobile communication system
  • Method of perch channel transmission and cell selection in CDMA mobile communication system
  • Method of perch channel transmission and cell selection in CDMA mobile communication system

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no. 1 approach

[0015] figure 1 A typical pilot channel transmission sequence for repeating a specific transmission pattern is shown for a first embodiment of the pilot channel transmission and cell selection method according to the present invention. Such as figure 1 As shown, by intermittently transmitting the pilot channel from each base station, the interference power level can be reduced compared to continuously transmitting the pilot channel.

[0016] Here, when the pilot channel is transmitted, the interference power is temporarily increased. However, according to the control (VOX control) that stops transmission whenever there is temporarily no rate data or transmission data, the method of intermittent transmission is adopted for each of a plurality of communication channels, due to the interference in a plurality of wireless channels including pilot channels, As a result of the statistical addition of wireless channels that transmit and wireless channels that do not transmit at eac...

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Abstract

A perch channel transmission and cell selection method for a CDMA mobile communication system which is capable increasing a system capacity by reducing an amount of interference power. In this method, each base station intermittently transmits a perch channel which is spread by using a spread code assigned to each base station. Then, a mobile station receives more than one perch channels transmitted from more than one base stations, measures a receiving level of an intermittently transmitted portion of each received perch channel, and judges a located cell according to measured receiving levels of these more than one perch channels.

Description

technical field [0001] The present invention relates to a pilot channel transmission and a cell selection method in a CDMA (Code Division Multiple Access) mobile communication system, wherein a plurality of base stations corresponding to each cell transmit signals extended by mutually different code words assigned to these base stations The pilot channel, and each mobile station uses the received pilot channel to determine the cell it is in. Background technique [0002] A digital mobile communication system called PDC (Personal Digital Cellular) system which recently provides mobile communication services in Japan can be taken as an example of a conventional mobile communication system in which a mobile station receives a signal transmitted continuously at a constant level by each base station. Channel selection for cell selection. Then, the mobile station measures the reception levels of a plurality of pilot channels continuously transmitted by surrounding base stations, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W48/20H04W64/00
CPCH04W48/20H04B7/26Y02D30/70
Inventor 中村武宏尾上诚蔵大野公士
Owner KOKUSA ELECTRIC CO LTD
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