Telecommunications – Interference signal transmission
Reexamination Certificate
1999-03-02
2002-11-05
Bost, Dwayne (Department: 2681)
Telecommunications
Interference signal transmission
C455S456500, C455S011100
Reexamination Certificate
active
06477353
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a wireless communication system in which a mobile station relays a wireless signal sent from a base station to other mobile stations using a weak radio wave, more particularly to a method for transferring a wireless signal among the mobile stations in this wireless communication system.
BACKGROUND ART
The following is disclosed in Japanese Published Unexamined Patent Application No. Hei 9-252277. Referring to FIG.
1
. Information transmitted from the fixed station (
101
) is first received by the mobile station A (
103
) and the information is processed by the station A. Then, the information is relayed to the mobile station B (
105
). Thereafter, the information is sequentially relayed to the mobile stations C (
107
) and D (
109
) from the mobile station B (
105
). In such manner, it becomes possible to transmit the information in a wide area with a small power by relaying the information. Moreover, the value of a re-transmitting counter is included in a transmitting frame, and the value of the re-transmitting counter is incremented by one after every relay. It is determined, according to the value of the re-transmitting counter whether the information is to be relayed or not. The present invention depicts that the information can be localized by implementing this method. However, a problem may be created if the information to be relayed is determined based on the number of relays. For example, if the relay is performed among the mobile stations located at short distances or close to one another, a problem arises that the limitation to the number of relays is reached before the information has propagated far from the fixed station.
The following is also disclosed in Japanese Published Unexamined Patent Application No. Hei 10-32538. Referring to FIG.
2
. The mobile object CR
1
collects data as to the present position and time from the GPS (Global Positioning System) apparatus GP
1
during its running, and based on the data the running locus (course of travel) until the present time, the average speed, the elapsed time, the degree of the traffic congestion and the like on the course are stored in the memory MM
1
as traffic information message MS
1
. Moreover, there is the following description relating to FIG.
3
. “It is assumed that the mobile object CR
1
and the mobile object CR
2
become proximate with one another so that they are capable of communicating with each other. The mobile object CR
2
sends the traffic information message MS
2
-
2
stored therein to the mobile object CR
1
, and the mobile object CR
1
sends to the mobile object CR
2
the traffic information messages MS
1
which is being possessed by the mobile object CR
1
and the mail information message MS
6
addressed to the computer, which is to be transmitted. In the traffic information message MS
1
received by the mobile object CR
2
important parts for the mobile object CR
2
are displayed on the display device DS
2
as newly-received information. Similarly, in the traffic information message MS
2
-
2
received by the mobile object CR
1
, important parts for the mobile object CR
1
are displayed on the display device DS
1
as newly-received information. Although the message transfer system of this embodiment possesses no guarantee for data arrival, essentially, the arrival rate must be increased as high as possible. Since there are actually many mobile objects running in the same area, traffic information data concerning a certain area/route will be sequentially updated to the latest data. Particularly, in the case where traffic snarls occur as in Japan, other mobile objects are always present around a certain mobile object, it will be possible to exchange messages with substantially the same high speed and in the same wide range as those in a wired network. Moreover, there is a description in which since instant messages need not be transmitted in a wide range, the messages are not stored for a long time and are soon deleted. However, the prior art contains no description in which it is judged how instant the messages are and at what time the messages should be deleted. Furthermore, there is no description as to a problem if many mobile stations are mal-distributed.
OBJECTS OF THE INVENTION
In the background arts described above, the mechanism in which the information transmitted from either the base station or the fixed station is exchanged among the mobile stations is disclosed. However, only the fact that the processing in the mobile stations to control the propagation of the information is performed by the number of relays is disclosed. Accordingly, the object of the present invention is to provide a method for controlling the propagation of information in a more reasonable style.
Another object of the present invention is to limit the propagation of the information to a predetermined range.
Still another object of the present invention is to avoid congestion of the information to be propagated.
Still a further object of the present invention is to enable the information to be propagated more efficiently.
SUMMARY OF THE INVENTION
The system that is the premise in the present invention is analogous to the foregoing background arts. Specifically, the information sent by the base station (the fixed station in
FIG. 1
) as shown in
FIG. 1
is transmitted, for example, from the mobile station A to the mobile station B, from the mobile station B to the mobile station C, sequentially, whereby the information propagates from the mobile station A to the mobile station C. As shown in
FIG. 2
, each mobile station has at least the antenna AT
1
, the display device DS
1
, the receiver RX
1
, and the transmitter TX
1
, and receives wireless signals by the receiver RX
1
via the antenna AT
1
and presents the information necessary for the user of this mobile station among the received wireless signals to the user with the display device DS
1
. On the other hand, the mobile station transmits the wireless signal including specific information to other mobile stations from the transmitter TX
1
using the antenna AT
1
. As shown in
FIG. 3
, when the mobile station CR
2
communicates with the mobile station CR
1
, the mobile station CR
2
sends the received information MS
2
-
2
to the mobile station CR
1
, and the mobile station CR
1
sends the stored information MS
1
and MS
6
to the mobile station CR
2
. Thus, the information is exchanged between the mobile stations CR
1
and CR
2
.
As understood from the above descriptions, although the exchanges of the information among the mobile stations are performed similarly to the background arts, the present invention shows which information is propagated among the mobile stations. Specifically, in a mobile wireless transceiver, if it is determined that received information including position information of an information origin transmitting information initially is to be transferred, the following steps are executed: calculating a distance from the information origin using the position information; comparing the distance with a predetermined threshold; and determining that the received information is not to be transferred if the distance is greater than or equal to the predetermined threshold. Thus, the propagation of the information is limited to a specific area from the information origin, so that it is possible to transmit more localized information to users in a specific area.
As another aspect of the present invention, in a mobile wireless transceiver, if it is determined that received information is to be transferred, the following steps are executed: judging whether a valid period of receiving information has expired; and determining that the received information is not to be transferred if the valid period thereof has expired. Obsolete information shall not be transferred, so that an overflow of the transferred information can be prevented. Moreover, if the velocity of the mobile station is approximately constant, the propagation area of the information will be limited to a specific area remote from
Honda Ryohjj
Kitayama Fumihiko
Kuse Kazushi
Bost Dwayne
Green Miguel D.
International Business Machines - Corporation
Ray-Yarletts Jeanine S.
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