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Method for adjusting transmission power in a cellular radio system and a subscriber equipment
| Details |
Inventors: Jolma, Petri; Keskitalo, Ilkka; Kiema, Arto; Savusalo, Jari;
Assignee: Nokia Telecommunications Oy (Espoo, FI)
Primary Examiner: Le; Thanh Cong
Assistant Examiner:
Attorney, Agent or Firm: IP Group of Pillsbury Madison & Sutro LLP
Transmission power control of a mobile terminal unit in a cellular telecommunication system, in which: the base station informs the mobile units of its existence on a common control channel in a TDMA slot, at least one control channel is dedicated to the mobile terminals seeking connection, and the power level of the connection-seeking signal is dependent of the measured power level, downlink, from the base station. |
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DETAILED DESCRIPTION The object of the present invention is to avoid great differences in the levels of received Channel Requests, and thus to eliminate the interference caused by them in the operation of the base station receiver.
This is achieved with the method of the invention, which is characterized in that the mobile station sends a Channel Request to a base station at a transmission power computed on the basis of the measured power of the signal received from the base station on a common control channel.
The invention also relates to a subscriber mobile station for use in a cellular radio system that comprises at least one base station in each cell, communicating with the mobile stations located in the cell.
In the system, the base station sends data about itself on at least one control channel common to all mobile stations.
The system comprises at least one common control channel for transmitting Channel Requests from mobile stations to the base station to establish a connection on a traffic channel.
The mobile station comprises means for adjusting the transmission power on the basis of the data transmitted from the base station on a control channel.
The mobile station of the invention is characterized in that the mobile station comprises means for computing, on the basis of the measured power of the signal received from the base station on a common control channel, the transmission power needed when a Channel Request is sent to the base station.
In the idle mode, the mobile stations are in continuous contact with the base station system.
A mobile station can often receive a plurality of base stations, which may belong to different networks.
It must be able to differentiate between the networks, and to select the most advantageous base station.
To make these decisions, the mobile station needs information about the base stations.
The base stations send the information on common control channels, which can be received by all mobile stations.
When the power of the signal received on a common control channel is measured in accordance with the present invention, the transmission power of the Channel Request can be adjusted to be such that the base station can receive the request without having too high signal levels interfere with its operation
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