Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2001-10-12
2004-04-20
Urban, Edward F. (Department: 2685)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S013400, C455S127100, C455S458000
Reexamination Certificate
active
06725068
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a digital wireless telephone system, and more particularly to a digital wireless telephone system, in which a mobile station is improved in efficiency of the intermittent reception operation in its standby mode reducing power consumption.
2. Description of the Related Art
In the digital wireless telephone system, since the mobile station uses a battery as its own power source, it is very important for the mobile station to reduce its power consumption. In this connection, various types of techniques have been developed to reduce the power consumption of the mobile station. Of these techniques, a so-called battery saving technique has been widely used, in which technique the mobile station has its reception portion intermittently operated in its standby mode to reduce its power consumption. FIG.
8
(
a
) shows a conventional intermittent reception operation of the mobile station in its standby mode. Transmitted at predetermined time intervals in a sending signal used in the conventional intermittent reception operation of the mobile station are time slots each containing paging information of the mobile station. The reception portion of the mobile station has its own power source turned on in timed relationship with paging channels (i.e., P); and turned off in the remaining period of time. For example, in the Digital Mobile-Phone System Standards (i.e., RCR STD-27) prepared by the Denpa Sangyo kai (i.e., ARIB), there is stipulated the intermittent reception operation of the mobile station for saving its battery power in the standby mode in a radio zone. An interval used in such intermittent reception operation stipulated in the above Standards is equal to one superframe interval (i.e., 720 milliseconds) at maximum.
However, in the conventional intermittent reception operation with such one superframe interval at maximum, it is not possible to increase a continuous standby period of time, and, therefore often not possible to increase the efficiency of the intermittent reception operation. Further, the conventional intermittent reception operation with such one superframe interval at maximum is disadvantageous in that it can not set arbitrarily the continuous standby period of time.
BRIEF SUMMARY OF THE INVENTION
Under such circumstances, the present invention was made. Consequently, it is an object of the present invention to provide a digital wireless telephone system, in which the interval in an intermittent reception operation of a mobile station is increased, so that a continuous standby period of time of the mobile station is increased to reduce power consumption of the mobile station.
According to a first aspect of the present invention, the above object of the present invention is accomplished by providing:
In a digital wireless telephone system comprising a mobile station provided with a reception portion, which portion is timed in its turning-on-power operation to a paging channel contained in a sending signal issued from a telephone exchange to the mobile station through a base station, and is held in its de-energized state in the remaining period of time, the improvement wherein:
when an intermittent standby operation is available, the telephone exchange sends out a paging message in an intermittent superframe reception group and in a paging channel group, for which groups the mobile station is waiting; and
the mobile station receives broadcast information, specifies an intermittent reception group on the basis of the contents of intermittent standby information contained in the broadcast information, and performs its intermittent standby reception operation in the reception group having been thus specified.
In the digital wireless telephone system having the above construction, the mobile station performs the intermittent standby reception operation based on the intermittent standby information contained in the broadcast information having been received by the mobile station, so that the interval in such intermittent reception operation is increased, whereby the continuous standby period of time of the mobile station is also increased so as to reduce the power consumption of the mobile station.
According to a second aspect of the present invention, the above object of the present invention is accomplished by providing:
The digital wireless telephone system as set forth in the first aspect of the present invention, wherein the telephone exchange comprises:
an intermittent reception extension information setting means for setting the contents of intermittent standby information in an extension information element contained in the broadcast information;
a subscriber's information discriminating means for discriminating subscriber's information;
an intermittent reception group analyzing means for analyzing the intermittent reception group of the mobile station, on the basis of a discrimination result obtained from the subscriber's information discriminating means and of the intermittent standby information having been set by the intermittent reception extension information setting means; and
a message sending means for sending out the paging message in an intermittent reception group and the paging channel group, for which groups the mobile station is waiting.
The digital wireless telephone system having the above construction is preferable in that the mobile station performs the intermittent standby reception operation based on the intermittent standby information contained in the broadcast information having been received by the mobile station to further increase the interval in such intermittent reception operation.
According to a third aspect of the present invention, the above object of the present invention is accomplished by providing:
The digital wireless telephone system as set forth in the first aspect of the present invention, wherein
defined as the contents of intermittent standby information in the broadcast information are:
an extension information element length; and
an intermittent standby information element comprising an intermittent standby superframe interval and an intermittent standby superframe counter.
The digital wireless telephone system having the above construction is preferable in that the system is capable of arbitrarily setting the interval in the intermittent standby operation of the mobile station, and also capable of performing both synchronization and compensation of such interval.
According to a fourth aspect of the present invention, the above object of the present invention is accomplished by providing:
In a digital wireless telephone system comprising a mobile station provided with a reception portion, which portion is timed in its turning-on-power operation to a paging channel contained in a sending signal issued from a telephone exchange to the mobile station through a base station, and is held in its de-energized state in the remaining period of time, the improvement wherein:
the telephone exchange retrieves both of location information and subscriber's information from a subscriber's information memory, and sends out a paging message in both an intermittent superframe reception group and a paging channel group, for which groups the mobile station is waiting; and
the mobile station receives broadcast information, specifies an intermittent reception group on the basis of an intermittent standby superframe interval having been set in its own unit by means of an intermittent standby superframe counter, and performs its intermittent standby reception operation in the reception group having been thus specified.
In the digital wireless telephone system having the above construction, the mobile station uses the intermittent standby superframe counter contained in the broadcast information, specifies the intermittent reception group on the basis of the intermittent standby superframe interval having been set in its own unit, and performs the intermittent standby reception operation in the reception group thus specified, which
Higuchi Kazuhisa
Kamataki Hideki
Akin Gump Strauss Hauer & Feld & LLP
Nguyen Thuan T.
Tokyo Digital Phone Co., Ltd.
Urban Edward F.
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