Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1998-05-18
2001-12-18
Bost, Dwayne (Department: 2681)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S432300, C455S435100, C455S436000, C455S515000, C455S067150, C455S226200
Reexamination Certificate
active
06332078
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a receiver device such as, a paging receiver or the like utilizing, for instance, a multi-area roaming service in paging services, and a receiving channel setting method used therefor.
This application is based on Japanese Patent Application No.9-132384, filed May 22, 1997 and Japanese Patent Application No. 9-154870, filed Jun. 12, 1997, the contents of which are incorporated herein by reference.
Generally, paging receivers are becoming widely popular even among youths, and recently, in paging systems represented by the high-grade radio paging system (RCR STD-43 Standard), the service areas in the whole of a country are covered by 36 channel frequencies, whereby a so-called multi-area roaming service is achieved according to which it is possible for a user to receive a message addressed to the user wherever the user may be.
FIG. 26
shows the format of the transmitting data in this high-grade paging system, wherein data divided by cycle numbers “No. 0”-“No. 14” is transmitted in one hour, and further, in each of the cycles, 128 FRAMES numbered as “No. 0”-“No. 127” are transmitted.
The respective frames, which each correspond to 1.875 [sec], are each comprised of a first synchronizing portion S
1
, a frame information FI, a second synchronizing portion S
2
, a block information BI, an address field AF, a vector field VF, a message field MF and an idle block IB in this order.
In the frame information FI, there is contained a cycle number, a frame number, a roaming network bit RNB. The cycle number and the frame number indicate that the frame is included in which frame and cycle. The roaming network bit is an identification bit indicating whether or not the channel has a roaming service. If the roaming network bit is “1”, it indicates that the channel has a roaming service.
If the user is in a service area where the paging service company provides a multi-area roaming service, a network identifier NID is set in the address field AF in every 8 frames. Stated another way, the NID is set in the frame number which is a modulo
8
of (M+N+C). Here, M is a modulo
8
of an integer part of a division of channel frequency by channel interval, N is a modulo
8
of the network address, and C is the cycle number. If the user changes the service area to a new one, the user receives the NID of the area in which he wants to receive a message, whereby the receiver is adjusted to the channel frequency to which this NID is set, and then, he or she transmits to the exchange for this service area, by the use of the nearest telephone set or the like, the service code of the multi-area roaming service, the password previously determined through the exchange in this service area, and the area No. of the area in which the service is to be received. Thus, the registration of the service area is finished.
In the transmitting data format of the multi-area roaming service, a local identifier LID is set separately from the NID; it is set in one of the second to fourth code words of the block information BI in every frame.
FIG. 27
shows the data format of the first code word of the block information BI which comprises check bits×(4 bits), a word number p (4 bits) of the priority address of the address field AF, a termination word a (2 bits) of the block information BI, a start word v (6 bits) of the vector field VF, a frame continuation flag d (2 bits), a variable receiving cycle value m (3 bits), and check bits (11 bits) including an even parity.
On the other hand,
FIG. 28
shows the data format of the second to fourth code words of the block information BI, which comprises check bits×(4 bits), a format type f (3 bits), data s (14 bits), and check bits (11 bits) including an even parity.
If the value of the format type f is “111”, SSID
1
comprising a local channel identifier LID (9 bits) and a coverage zone (5 bits) are set in the data s as shown in FIG.
29
. If the value of the format type f is “000”, SSID
2
consisting of a country identification code (10 bits) and a roaming traffic flag (4 bits) are set in the data s.
The SSID
1
and SSID
2
are both set as a pair in the block information BI, and, as for the LID thereof, the same one is set if a plurality of receiving channels are used in one service area.
However, if the change of the service area and the area registration are performed in a paging service in which the multi-area roaming service is provided by the use of such data formats as mentioned above, the user receiver terminal sweeps the respective channels until the NID is detected, in accordance with the scan list of the channel frequency to be received, which has been previously set as ID information, without regard to environmental circumstances such as “the radio waves of what channel frequencies are arriving around him” and “whether the data of the desired bit rate can be received”. As a result, there is caused the inconvenience that a very long time such as, for example, more than one minute, is spent for the setting of the receiving channel, during which period the user always feels uneasy, wondering if he can receive the paging service in the particular service area.
BRIEF SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a receiver device and a receiving channel setting method in which the receiving-channel changing process and the registration process to be performed when the user is moving through service areas can be finished in a shorter time to eliminate the feeling of uneasiness of the user and to shorten as much as possible the period of time when the user cannot receive the paging service.
The above object can be achieved by the following receiver device and receiving channel setting method.
According to a first aspect of the present invention, there is provided a receiver device capable of changing a receiving channel, comprising receiving means for receiving a plurality of channel signals; setting means for setting a change mode in which receiving channels of the receiving means are changed; channel detection means which, when the change mode is set by the setting means, successively scans the receiving channels of the receiving means to detect candidate channels in which a signal bit rate is a desired bit rate; memory means for storing the candidate channels detected by the channel detection means; channel information detection means which selects some of the candidate channels stored in the memory means based on a predetermined priority and detects channel information included in a received signal of the selected channels; and received channel setting means which, when the channel information detected by the channel information detection means is channel information of a desired channel, sets the channel including the channel information of the desired channel as the received channel.
According to a second aspect of the present invention, there is provided the receiver device according to the first aspect, which further comprises signal intensity detection means for detecting signal intensities of the channels, and in which the received channel setting means sets the received channel in consideration with the detected signal intensities.
According to a third aspect of the present invention, there is provided the receiver device according to the aspect 2, in which the memory means stores the channel information detected by the channel information detection means and the signal intensities detected by the signal intensity detection means in association with each other.
According to a fourth aspect of the present invention, there is provided the receiver device according to one of the first to third aspects, in which the channel information is transmitted at a predetermined interval, which further comprises means for detecting which channel transmits the channel information earliest, and in which the channel information detection means sets a channel in which the channel information is detected based on the detection result of the detecting
Bost Dwayne
Casio Computer Co. Ltd.
Davis Temica M.
Frishauf, Holtz Goodman, Langer & Chick, P.C.
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