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Radio channel control apparatus used in a CDMA cellular system and capable of changing cell size
| Details |
Inventors: Kanai, Toshihito;
Assignee: NEC Corporation (Tokyo, JP)
Primary Examiner: Hofsass; Jeffery A.
Assistant Examiner: Townsend; Clement
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
A radio channel control section 370 transmits and receives to and from an adjacent base station uplink/downlink channel communication qualities measured by a communication channel transmit/receive section 330 and a mobile station 410, respectively, compares them with predetermined lower and upper threshold values Tl/Th, requests a pilot channel transmit section 350 to decrease and increase the transmission power level of a pilot signal if the threshold value Tl is not reached and the threshold value Th is exceeded, respectively. For a downlink channel, a hand-off parameter is increased and decreased if the threshold value Tl is not reached and the threshold value Th is exceeded, respectively. For an uplink channel, the hand-off parameter is decreased and increased if the threshold value Tl is not reached and the threshold value Th is exceeded, respectively. |
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DETAILED DESCRIPTION It is therefore an object of this invention to provide a radio channel control apparatus capable of changing a size of a cell.
It is another object of this invention to provide a radio channel control apparatus capable of controlling a power of a pilot signal.
It is still another object of this invention to provide a radio channel control apparatus capable of controlling a hand-off parameter of a mobile station.
It is still another object of this invention to provide a radio channel control apparatus in a CDMA cellular system which is capable of expanding, in occurrence of concentration of the traffic in a particular cell, a traffic handling capacity of the overall system by handling a part of the traffic by an adjacent cell.
Other objects of this invention will become clear as the description proceeds.
On describing the gist of this invention, it is possible to understand that a radio channel control apparatus is used in a base station of a CDMA cellular system to control communication which is carried out between the base station and mobile stations in a cell by the use of code-division multiplexed radio channels and a pilot signal sent from the base station, with a communication quality is monitored by the base station.
According to an aspect of this invention, the radio channel control apparatus comprising a quality monitoring means for monitoring the communication quality of at least one of the code-division multiplexed radio channels to produce a quality monitoring signal representative of the communication quality, and power level control means for controlling a power level of the pilot signal in response to the quality monitoring signal to change the cell in size from one to another in dependency upon the power level of the pilot signal.
According to another aspect of this invention, a radio channel control apparatus is used in a base station of a CDMA cellular system to control communication which is carried out between the base station and mobile stations in a radio zone by the use of code-division multiplexed radio channels and a control channel, with a communication quality monitored by the base station
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