Abstract
PROBLEM TO BE SOLVED: To control transmission power in a cellular radio system by a little signal quantity taking the special necessity of a packet-switching link into consideration.
SOLUTION: A terminal apparatus measures (30 31) a control signal from a base station before the establishment of connection and during a long rest between packets and compares its signal power (R0) with an objective level which the base station holds. The base station notifies the transmission power by the control signal too and the terminal apparatus regards the same power as the transmission power by correcting only a difference (t0-R0) between the objective level and quality for a link to be measured (32). The quality (RXQUAL) for the link to be measured is transmitted as an acknowledgement message and the transmission power is changed so as that the quality reaches a definite objective level at a transmission side. The maximum width of the change is decided by the length of the packet. The base station uses the maximum power at first in packet transfer to a down link direction and then corrects the transmission power based on measured information in an acknowledgement message transmitted from the terminal apparatus.
COPYRIGHT: (C)2005JPO&Japio
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
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