Multiplex communications – Communication over free space – Combining or distributing information via code word channels...
Reexamination Certificate
1998-03-30
2001-03-27
Ton, Dang (Department: 2732)
Multiplex communications
Communication over free space
Combining or distributing information via code word channels...
Reexamination Certificate
active
06208634
ABSTRACT:
FIELD OF THE INVENTION
The invention relates generally to the field of wireless communication systems and more particularly, to methods and apparatus for setting up a call in CDMA systems.
BACKGROUND OF THE INVENTION
For CDMA call setup, a base station and/or mobile switching station (for convenience we will refer to both/either as the base station) should know the service options supported by a mobile station. In existing CDMA systems as defined in the IS-95 standard of the Telecommunications Industry Association and the Electronic Industries Association (TIA/EIA/IS-95), TSB74, and ANSI J-STD-008 the disclosures of which are incorporated herein by reference, the base station receives a preferred service option during call initiation, but any alternative service options supported by the mobile station must be requested at a later time. The base station sends a Status Request Message on the Paging channel and/or Traffic channel to get this additional information. The mobile station then responds by sending a status message. The magnitude of the time period for this exchange may be in the order of seconds which is an inordinate amount of time in electronics and is thus inefficient.
Accordingly there exists a need for a more efficient system and method of negotiating service options between a base station and a mobile station in CDMA systems.
There also exists a need for a CDMA system which eliminates the need for request and response negotiations between the base station and a mobile station to determine which service options are available to the mobile station.
Accordingly it is an object of the present invention to provide more efficient systems and methods of negotiating service options between a base station and a mobile station in a CDMA system.
It is another object of the present invention to provide a CDMA system which eliminates the need for request and response negotiations between the base station and a mobile station to determine which service options are available.
Another object of the present invention is to provide a CDMA system which transmits preferred and alternate service options supported by the base station during call initiation.
These and other objects of the invention will become apparent to those skilled in the art from the following description thereof.
SUMMARY OF THE INVENTION
In accordance with the teachings of the present invention, these and other objects may be accomplished by the present systems and methods of initiating a call in a wireless CDMA system. An embodiment of the present invention includes a method of initiating calls between a mobile station and a base station in a CDMA system wherein Status Request Messages and Status Response Messages are not required for the base station to determine alternate service options supported by the mobile station. In the method of this embodiment the mobile station generates an origination message including a field including a preferred service option supported by the mobile station and a different field including all service options supported by the mobile station. After the message is generated the mobile transmits the origination message to the base station.
In an exemplary embodiment of the invention, the method includes the base station sending a page message to the mobile station. The mobile station determines whether the page message is intended therefor. If it is, and if the mobile station is configured to receive mobile station terminated calls, the mobile station transmits a page response message to the base station. The page response message includes a preferred service option field and an all service option field.
In another embodiment of the invention, the system includes a wireless communication system configured to initiate calls between a mobile station and a base station wherein Status Request Messages and Status Response Messages are not required for the base station to determine alternative service options supported by the mobile station. The system includes means for generating an origination message which includes a preferred service option field and an all service options field. The system also includes at least one transmitter for transmitting the origination message generated by the message generating means.
Another embodiment of the invention includes a wireless communication system configured to initiate calls between a mobile station and a base station wherein Status Request Messages and Status Response Messages are not required for the base station to determine alternative service options supported by the mobile station. The system of this embodiment includes means associated with the base station for generating a page message. It also includes a transmitter associated with the base station, in electrical communication with the page message generating means and configured to transmit the page message. The system further includes a receiver associated with the mobile station which is configured to receive the page message; means for determining if the page message is intended for the mobile station; means for generating a page response message which is operative only if the determining means determines that the page message is intended for the mobile station. The page response message includes a preferred service option field and an all service option field. The system also includes a transmitter in electrical communication with the page response generating means and configured to transmit the page response message.
In another embodiment of the present invention, the system includes a wireless communication system configured to initiate calls between a mobile station and a base station wherein Status Request Messages and Status Response Messages are not required for the base station to determine alternative service options supported by the mobile station. In this embodiment, the invention includes a microprocessor associated with the base station and configured to generate a page message. It also includes a transmitter associated with the base station which is in electrical communication with the microprocessor and which is configured to transmit the page message. There is a receiver associated with the mobile station which is configured to receive the page message, and a microprocessor associated with the mobile station in electrical communication with the receiver and configured to determine if the page message is intended for the mobile station. The microprocessor is further configured to generate a page response message if it determines that the page message is intended for the base station. The page response message includes a preferred service option field and an all service options field. The mobile station includes a transmitter associated therewith which is in electrical communication with the microprocessor and which is configured to transmit the page response message.
The invention will next be described in connection with certain exemplary embodiments; however, it should be clear to those skilled in the art that various modifications, additions and subtractions can be made without departing from the spirit or scope of the claims.
REFERENCES:
patent: 5878344 (1999-03-01), Zicker
patent: 5887259 (1999-03-01), Zicker et al.
Baltas Ahmet
Boulos Pierre
Cobrin & Gittes
Nortel Networks Limited
Ton Dang
LandOfFree
Methods and apparatus for CDMA wireless call setup... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Methods and apparatus for CDMA wireless call setup..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods and apparatus for CDMA wireless call setup... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2466862