Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
1998-09-14
2001-02-13
Maung, Nay (Department: 2744)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S434000, C455S515000
Reexamination Certificate
active
06188910
ABSTRACT:
BACKGROUND
1. Technical Field
The present application relates generally to a radio communication system and, more particularly, to a method for accessing a base station by mobile stations, which provides a reduction in access time and prevents collisions between access requests made from a plurality of mobile stations on the same access channel.
2. Description of the Related Art
In general, as shown in
FIG. 1
, a plurality of mobile stations (MSs) MS#
1
-MS#n are wirelessly connected to a single base station (BS)
100
in a radio communication system. Although mobile stations can generally be applied to various fields,
FIG. 1
illustrates mobile stations MS#
1
-MS#n being mounted on a vehicle.
Conventionally, in order to accomplish communication between the base station
100
and one of the mobile stations MS#
1
-MS#n, an access operation (i.e., an access request by the mobile station and an access approval by the base station) through a specified access channel must first be performed. The mobile station transmits an access request signal to the base station through one of a plurality of access channels to communicate with the base station. If the access requested channel is not currently occupied, the mobile station can communicate with the base station via the access channel. If the access requested channel is already occupied, however, or if two different mobile stations MS#
1
and MS#
2
simultaneously make access requests through the same access channel RCH#
1
(as illustrated in FIG.
2
), a collision will occur between the access requests, which prevents either mobile station from accessing the base station. In this situation, the mobile stations will attempt to access the base station after some time.
Referring to
FIG. 3
, another conventional method for accessing a base station involves allocating time slots TS#
1
-TS#n to the mobile stations MS#
1
-MS#n, respectively, so as to prevent potential collisions among the mobile stations during access request operations. One disadvantage to this method, however, is that a longer access time is required for accessing the base station
100
since the mobile stations MS#
1
-MS#n can only make access requests during their allocated time slots. For instance, even if mobile station MS#
2
does not make an access request, mobile station MS#
3
cannot use the time slot TS#
2
allocated to MS#
2
, and can only make an access request during the allocated time slot TS#
3
after the passage of time slot TS#
2
.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a method for preventing collisions among the access requests, when a plurality of mobile stations request access to a base station in a radio communication system.
It is another object of the present invention to provide a method for reducing an access time required when a mobile station accesses a base station in a radio communication system.
To achieve the above objects and other advantages, a method is provided for connecting mobile stations to a base station in a radio communication system having a plurality of channels. In the method, the base station allocates one of the channels as a broadcast channel, and then transmits channel information about the access channels currently occupied to the mobile stations via the broadcast channel. Any one of the mobile stations can transmit an access request signal to the base station via an unoccupied access channel based on the channel information received from the base station via the broadcast channel. Upon receipt of an access approval signal from the base station, the mobile station seeking access to the base station can then obtain access via the unoccupied channel.
These and other objects, features and advantages of the present invention will become apparent from the following detailed description of illustrative embodiments, which is to be read in connection with the accompanying drawings.
REFERENCES:
patent: 4612637 (1986-09-01), Davis et al.
patent: 4977612 (1990-12-01), Wilson
patent: 5123029 (1992-06-01), Bantz et al.
patent: 5278835 (1994-01-01), Ito et al.
patent: 5331316 (1994-07-01), Mestdagh et al.
patent: 5581802 (1996-12-01), Erickson et al.
patent: 5673259 (1997-09-01), Quick, Jr.
patent: 5680398 (1997-10-01), Robinson
patent: 5729542 (1998-03-01), Dupont
patent: 5752193 (1998-05-01), Scholefield et al.
patent: 5778316 (1998-07-01), Persson et al.
patent: 5790941 (1998-08-01), Peponides
patent: 6002664 (1999-12-01), Schachter
patent: 0734191 (1996-09-01), None
patent: 2277849 (1994-11-01), None
patent: 2297013 (1996-07-01), None
Jeong Joong-Ho
Park Su-Won
Dilworth & Barrese LLP.
Maung Nay
Samsung Electronics Co,. Ltd.
Vuong Quochien B.
LandOfFree
Method for connecting mobile stations to base station in... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for connecting mobile stations to base station in..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for connecting mobile stations to base station in... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2611484