Radio network communication system

Details Radio network communication system Radio network communication system

2000-11-21

2004-07-13

Maung, Nay (Department: 2684)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S453000, C455S433000, C455S553100, C709S216000, C709S217000, C709S218000

Reexamination Certificate

active

06763248

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a radio network communication system in which a radio communication terminal such as a cellular phone, and more particularly to such a radio network communication system suitable for transmitting a larger amount of data to a plurality of radio communication terminals.
2. Description of the Related Art
There is widely used a handy radio communication terminal such as a personal digital cellular (PDC), a personal handy phone system (PHS) or a handy communication terminal including a radio modem. Among such handy radio communication terminals, a cellular phone such as PDC or PHS has been first used as a small-sized telephone. However, as multi-media communication has developed, they are used also in a field of data communication, for instance, they are used for transmitting and receiving electronic mails.
In particular, an internet is frequently used in a lot of homes as well as in a lot of offices, resulting in a remarkable increase in an access by a user of a radio communication terminal to a world wide web (WWW) from a place remote from an office and a home. Accordingly, a handy radio communication terminal is, now designed to include a software for making access to a World Wide Web, ensuring that a user can make access to and observer a desired homepage.
A homepage is made of a content which is called a hypertext. A hypertext is designed to allow a text, a still picture, a moving picture and voices in a hypertext to link to an object including associated data. Hence, selecting a certain word in a hypertext, which links to other data, it would be possible to retrieve and display data associated with the word.
As a hypertext, there are a hypercard, a hypertext markup language (HTML), and so on.
A presently available radio communication terminal has a quite low communication rate in comparison with an access rate at which an access is made to a homepage through a telephone network or CATV (cable television). Hence, there has been suggested a radio network communication system which allows a handy radio communication terminal to readily download a hypertext including pages having a still picture, a moving picture and/or voices.
For instance, Japanese Unexamined Patent Publication No. 10-171702 has suggested a communication terminal which enhances a response rate at which a page is switched to a next page while the terminal is making access to a homepage.
In the suggested communication terminal, names of a server and a directory in a presently displayed page are identified, and then, an associated HTML file located at a lower layer is retrieved in series, based on the identified names. Then, the thus retrieved HTML file is stored in a memory. When a homepage reader turns a page, a HTML file associated with the next page is read out of the memory, and the thus read-out HTML file is displayed at a display unit. As a result, a response rate for displaying a HTML file can be enhanced.
In the above-mentioned Japanese Unexamined Patent Publication No. 10-171702, HTML files are retrieved in series, and then, stored in a memory. Accordingly, it is necessary to store pages having a small possibility to be displayed, in a memory, in order to swiftly display a requisite page. Hence, the communication terminal suggested in the Publication is suitable for a relatively large-sized communication terminal including a memory having a sufficient capacity, and having a sufficient communication rate.
However, the communication terminal is accompanied with a problem that the communication terminal has to download data which will not be used.
To solve this problem, Japanese Unexamined Patent Publication No. 11-212889 has suggested a communication terminal which reduces not only a load of displaying data, but also a load of downloading data.
FIG. 1
is a block diagram of the suggested communication terminal.
The communication terminal
100
is comprised of a reader
102
to which a communication line
101
is connected, a memory
103
, a hypertext analyzer
104
including an image file reader
106
, an image developer
107
, a layout designer
108
, and a display unit
109
.
The reader
102
reads out a hypertext transmitted through the communication line
101
. The thus read-out hypertext is stored in the memory
103
. The hypertext analyzer
104
analyzes the hypertext stored in the memory
103
, and reads out data by which an image file is defined, stored in the hypertext. Then, the hypertext analyzer
104
determines whether the image file is read out from a server (not illustrated).
When the image file is to be read out, the image file reader
106
does so, and the image developer
107
develops the thus read-out image file. The layout designer
108
designs a layout, based on the data analyzed by the hypertext analyzer
104
. The display unit
109
displays data formed based on the layout designed by the layout designer
108
.
The hypertext analyzer
104
determines whether the image file is read out from a server, in accordance with whether a file of the image data to be read out is greater in a size than a threshold size. When the image file is not to be read out, an eye-con is displayed in place of the image file at a place where the image file was to be displayed.
Japanese Unexamined Patent Publication No. 11-212889 has made suggestions other than the communication terminal illustrated in FIG.
1
. For instance, whether an image file is to be read out is determined in accordance with presence or absence of a link as well as a size of an image file. As an alternative, whether an image file is to be read out is determined, based on a capacity at which a display unit of a receiver terminal displays data.
In the communication terminal illustrated in
FIG. 1
, a load of the communication terminal
100
is reduced in accordance with a status of the communication terminal
100
acting as a data receiver, ensuring that received data can be effectively displayed.
In a radio network communication. system in which a radio communication terminal such as the communication terminal
100
is used, a load of a communication network as well as a load of a radio communication terminal has to be considered.
For instance, in a cellular phone system, base stations are positioned to cover a relatively small area in order to effectively utilize a limited number of frequencies. Frequencies are assigned to cellular phones such that frequencies are not interfered with each other in adjacent areas, and those frequencies are repeatedly used.
In addition, a frequency is divided into a plurality of frequencies by time division to use in a plurality of channels. In general, if a channel is defined for a frequency band, it would be possible to increase an amount of data transmittable per a unit time. However, it would be unavoidable that the number of channels is reduced accordingly, and hence, the number of users per a unit area is unavoidably reduced.
As a result, there exists an optimal number of communication terminals which can be connected to a, channel or which can concurrently make radio communication, in a radio network communication system in which a radio communication terminal such as PDC, PHS, or a handy communication device including a radio modem is used. Hence, if the system illustrated in
FIG. 1
, which is supposed to be used as a non-radio communication system, is applied to a radio network communication system, though respective communication terminals might operate well, the radio network communication system does not operate well, or some communication terminals might not be able to operate.
That is, even if a communication terminal to which a homepage is downloaded had a high capacity for displaying data, or could process images at a high rate, the communication terminal may occupy network resources more than necessary, resulting in that other communication terminals cannot make radio communication well.
SUMMARY OF THE INVENTION
In view of the above-mentioned problems in the prior art, it is an object of the present inventi

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