JPH026260B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transmission power control method for controlling a transmitting power value on a transmitting side based on a received power value in a radio line that is affected by fading.

Conventionally, this type of transmission power control method detects the 50% reception power value on the receiving side, compares this value with a preset reception power threshold, and calculates the number of times the threshold has been exceeded. This was used as a criterion for power control. Therefore, conventional devices require time to perform transmission power control, and due to the inability to quantitatively grasp the state of severe fading fluctuations, There is a drawback that power control cannot follow this method.

The purpose of the present invention is to solve the above-mentioned conventional drawbacks and
An object of the present invention is to provide a transmission power control method that allows transmission power to follow even rapid fading fluctuations.

The transmission power control method of the present invention includes a 50% time rate received power value detection circuit that detects a 50% time rate received power value, an output of the 50% time rate received power value detection circuit, and a preset threshold value. In a transmission power control method that controls transmission power according to received power, the transmission power control method includes a transmission power control determination circuit that determines whether to perform transmission power control by comparing a fading depth threshold setting circuit in which a fading depth value is set; When the fading depth value when the time rate 50% received power value reaches a predetermined threshold value is larger than the threshold value set in the fading depth threshold setting circuit according to the output. It is characterized by outputting a control signal that increases the transmission power.

Next, the present invention will be described in detail with reference to the drawings.

The figure is a block diagram showing one embodiment of the present invention. That is, the radio waves transmitted from the transmitting device 3 are received by the transmitting device 4, and the receiving device 4 outputs the AGC voltage 12 according to the received power. When the received power value conversion circuit 5 inputs the AGC voltage 12, it outputs the power value received by the receiving device 4 at this time, and the received power value detection circuit 6 outputs the power value received by the receiving device 4 at a time rate of 50% and the time rate of 99%.
The signal is supplied to the received power value detection circuit 7. The time rate 50% received power value detection circuit 6 detects the received power value corresponding to the time rate of 50% for each fixed time from the occasionally changing received power value output from the received power value conversion circuit 5, and The 50% received power value 15 is sent to the fading depth value detection circuit 8 and the transmission power control determination circuit 11. On the other hand, the 99% time rate received power value detection circuit 7 detects the received power value corresponding to the 99% time rate of the received power, and the fading depth value detection circuit 8
send to The fading depth value detection circuit 8 has a reception power value detection circuit 6 with a time rate of 50% and a time rate of 99%.
This circuit detects the difference between the received power values output by the received power value detection circuit 7, and the fading depth value 13 output from the circuit indicates the depth of fading at the measurement time.

The fading depth threshold setting circuit 9 includes:
A threshold value for the fading depth is set in advance, and a threshold value for the 50% time rate received power is set in the 50% time rate received power threshold setting circuit 10. The transmission power control determination circuit 11 determines the fading depth value 13 and its threshold value 14 when the 50% time rate received power value 15 is in a state of being degraded below the 50% time rate received power threshold value 16. It compares and distributes to determine the execution of transmission power control, and when it is necessary to increase the transmission power, outputs a transmission power control signal 17 to the transmission power control circuit 2.
As a result, the transmission power control circuit 2
control to increase the transmission power. This embodiment has the advantage that the determination time for transmission power control is shortened, it is possible to quickly respond to sudden fading, and at the same time, the depth of fading that occurs in a short period of time can be quantitatively understood. There is.

As mentioned above, in the present invention, the time rate is 50%
The need for transmit power control by comparing the fading depth value when the received power value deteriorates below a predetermined 50% time rate received power threshold with a predetermined fading depth threshold. Since the configuration is configured to determine, the time required for determining transmission power control is shortened, and the depth of fading that occurs in a short period of time can be quantitatively clarified.

[Brief explanation of drawings]

The figure is a block diagram showing one embodiment of the present invention. In the figure, 1: reception power measurement circuit, 2: transmission power control circuit, 3: transmitter, 4: receiver,
5: Reception power value conversion circuit, 6: 50% time rate reception power value detection circuit, 7: 99% time rate reception power value detection circuit, 8: Fading depth value detection circuit, 9: Fading depth threshold setting Circuit, 10: Time rate 50% reception power threshold setting circuit, 11: Transmission power control judgment circuit, 12: AGC voltage, 13: Fading depth value, 14: Fading depth threshold, 15: Time rate 50 % received power value, 16: Time rate 50% received power threshold, 17: Transmission power control signal.

Claims (1)

[Claims] 1. On the receiving side, a time rate of 50% for detecting a received power value of 50% of the time.
It is equipped with a received power value detection circuit 6 and a transmission power control determination circuit 11 that compares the output of this detection circuit with a preset threshold value 16 and sends out a transmission power control signal 17 to be transferred to the transmitting side. The transmission power control method includes a fading depth value detection circuit 8 that detects a fading depth from a signal representing received power, and a fading depth threshold setting circuit 9 that sets a fading depth value, The control determination circuit determines that the output of the fading depth value detection circuit when the value detected by the 50% time rate received power value detection circuit reaches the preset threshold value is the fading depth threshold. 1. A transmission power control method comprising means for sending a control signal that increases transmission power when the value is greater than a value set in a value setting circuit.