Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1998-06-02
2001-04-10
Vo, Nguyen T. (Department: 2682)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S443000, C455S525000, C455S440000
Reexamination Certificate
active
06216003
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of handover control in a mobile radio communication system in which a service area for supporting a communication with respect to a mobile station is formed by a plurality of radio zones at which a plurality of base stations are distributedly provided respectively, for controlling a handover in the case where a mobile station moves from a currently located radio zone to a neighboring radio zone and a handover in the case of switching a type of channel to be used for the communication with respect to the mobile station.
2. Description of the Background Art
The conventional handover control in the mobile radio communication is realized in such a manner that, when a request for switching a radio channel occurs, this request is notified from a mobile station to a handover target base station or a currently located base station, via the currently located base station and an exchange station for controlling the currently located base station.
However, this conventional handover control is associated with a problem of increasing a transmission control load for transmission between the base station and the exchange station, a control load for controlling the exchange station itself, and a handover control delay.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a method of handover control in a mobile radio communication which is capable of reducing a transmission control load for transmission between the base station and the exchange station, a control load for controlling the exchange station itself, and a handover control delay.
According to one aspect of the present invention there is provided a method of handover control in a mobile radio communication system in which a service area for supporting a communication with respect to a mobile station is formed by a plurality of radio zones at which a plurality of base stations are distributedly provided respectively, for controlling a handover in which a mobile station moves from a currently located radio zone to a neighboring radio zone, the method comprising the steps of: (a) recognizing at the mobile station a moving from an non-overlapping area of the currently located radio zone and the neighboring radio zone to an overlapping area of the currently located radio zone and the neighboring radio zone within the currently located radio zone, and notifying the moving from the mobile station to a network side; and (b) setting up only a new communication channel between a handover target base station that constitutes the overlapping area and an exchange station for controlling the handover target base station, without setting up a new radio channel between the handover target base station and the mobile station, while continuing the communication by not releasing an original communication channel between a currently located base station and the exchange station and an original radio channel between the currently located base station and the mobile station, at the network side upon receiving a notification of the moving from the mobile station.
According to another aspect of the present invention there is provided a method of handover control in a mobile radio communication system having a mobile station that uses a random access channel and an individual channel switchably, for controlling a handover in which a type of channel to be used for a communication with respect to the mobile station is switched, the method comprising the steps of: notifying a request for switching a radio channel from one of the random access channel and the individual channel to another one of the random access channel and the individual channel, the request being notified directly from the mobile station to a currently located base station without utilizing a transmission via an exchange station for controlling the currently located base station; and setting up said one of the random access channel and the individual channel with respect to the mobile station while releasing said another one of the random access channel and the individual channel, at the currently located base station upon receiving the request from the mobile station.
Other features and advantages of the present invention will become apparent from the following description taken in conjunction with the accompanying drawings.
REFERENCES:
patent: Re. 36079 (1999-02-01), Uddenfeldt et al.
patent: 4955082 (1990-09-01), Hattori et al.
patent: 5109528 (1992-04-01), Uddenfeldt
patent: 5722044 (1998-02-01), Padovani et al.
patent: 5864760 (1999-01-01), Gilhousen et al.
patent: 5884177 (1999-03-01), Hanley
patent: 5926470 (1999-07-01), Tiedemann, Jr.
patent: 0 647 080 (1995-04-01), None
patent: 95/18513 (1995-07-01), None
patent: 97/08911 (1997-03-01), None
Hamajima Takuya
Nakamura Takehiro
Sato Takaaki
Yamagata Katsuhiko
NTT Mobile Communications Network Inc.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Vo Nguyen T.
LandOfFree
Method of handover control in mobile radio communication... 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 of handover control in mobile radio communication..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of handover control in mobile radio communication... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2487644