Base station control equipment, mobile station equipment, and radio communication system

• US 7,013,144 B2
• Filed: 06/02/2005
• Issued: 03/14/2006
• Est. Priority Date: 11/24/1999
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Yamashita, Atsushi, Tetsuka, Akiko
• Primary Examiner(s): Feild, Joseph
• Assistant Examiner(s): Nguyen, Huy D.
• Application Number:
  US11/142,987
• Publication Number:
  US 20050227710A1
• Time in Patent Office: 285 Days
• Field of Search: 455/442, 455/436, 455/438, 455/439, 455/450, 455/456.1, 370/331, 370/332
• US Class Current: 455/450
• CPC Class Codes: H04W 36/0085 Hand-off measurements
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 36/20 for optimising the interference level
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

The invention relates to a radio communication system, a base station control equipment and a mobile station equipment which constitute the radio communication system. An object of the present invention to maintain high channel capacity while adapting to geographical distribution of a mobile station which can perform soft hand-off. The base station control equipment comprises a transmission-quality measuring section for measuring the transmission qualities of reception waves arriving from mobile stations. In the process of channel control, the base station control equipment is given the allowable maximum number N of radio channels through which a BTS transmits in parallel, as a tolerable limit of interference with wireless zones formed by a local station and/or other stations. It allots, in descending order of the transmission qualities, N or less radio channels to the mobile stations which are transmitting ends of reception waves having measured transmission qualities.

Claims

1. A radio communication system, comprising:

a single or a plurality of mobile station equipments which can be located in any of a plurality of wireless zones;

a plurality of BTSs individually forming the plurality of wireless zones; and

a base station controller being cooperative with said plurality of BTSs, for performing channel control of a call occurring in said single or plurality of mobile station equipments, the channel control including soft hand-off, and wherein

said single or plurality of mobile station equipments each includes;

a position measuring section for measuring a position of a mobile station; and

a notifying section being given an allowable maximum number n of radio channels used in parallel for the soft hand-off of the mobile station and base-station positions indicating positions of all or a part of said single or plurality of BTSs, and when identifying a state in which the mobile station is feasible of the soft hand-off, for notifying the state to the BTSs individually forming n or less wireless zones which are specified according to relative distances in ascending order of the relative distances between the measured position of the mobile station and the corresponding base-station positions; and

said base station controller includes;

a transmission-quality measuring section for measuring transmission qualities of reception waves arriving in the notified state from said single or plurality of mobile station equipments; and

a channel allotting section being given a maximum number N of radio channels through which the plurality of BTSs can transmit in parallel, for allotting N or less radio channels to mobile stations in descending order of the measured transmission qualities via a BTS as radio channels to be used for the soft hand-off, the mobile stations being transmitting ends of the reception waves with their transmission qualities measured.