JPH0993188A - Transmission output controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain control for transmission with a proper output at all times by providing an information addition means and a transmission output level decision means deciding a transmission output level to an opposite station based on signal attenuation level information from the opposite station so as to reduce the power consumption. SOLUTION: A reception level measurement device 11 measures the reception level of a frame received by a receiver 3, a frame analyzer 14 extracts information relating to a transmission output and a signal attenuation level from the received frame. A signal attenuation level calculation device 12 calculates the signal attenuation level based on the reception level and the transmission output level from the frame analyzer 14. A transmission output level calculation device 15 calculates a transmission output level based on the attenuation level of the signal extracted by the analyzer 14. An information addition device 13 adds the information relating to the signal attenuation level calculated by the signal attenuation level calculation device 12 and the transmission output level calculated by the calculation device 15 to a frame sent from the transmitter 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission output control device, and more specifically, when the signal attenuation level of a propagation path between radio stations is different between upstream and downstream, and the reception sensitivities of the stations are mutually different. The present invention relates to a transmission output control device that controls the transmission output of each wireless station when different.

[0002]

2. Description of the Related Art In recent years, there has been a remarkable demand for smaller and lighter wireless terminal stations represented by mobile phones. Therefore, since the components used for the battery are smaller, the capacity of the attached battery is also limited, and a technique for reducing the power consumption as much as possible is being developed.

Conventionally, when a signal transmitted from one radio station is received by the other radio station, as in the transmission power control method disclosed in Japanese Patent Laid-Open No. 5-122125, the received signal is received. The power consumption is reduced by feeding back the strength of to the transmitting side and controlling the transmission output so that the receiving side can receive at an appropriate level.

[0004]

However, in the conventional transmission power control method, it is assumed that the signal attenuation level in the propagation path is the same for the upstream and the downstream, and the transmission output of both wireless stations is controlled centrally. are doing. In current wireless communication systems such as mobile phones, a system that allocates different frequencies for upstream and downlink and a system that dynamically changes the frequency have been put into practical use, but since the signal attenuation depends on the frequency, The signal attenuation level is not always the same in the upstream and the downstream. Therefore, in the conventional transmission output control device that controls the transmission output level according to the signal attenuation level of the propagation path between the wireless stations, when the signal attenuation level differs between the up and down propagation paths, the reception level at both wireless stations Makes a difference. In such a case, since the transmission output is selected according to the propagation path with the higher signal attenuation level, the wireless station on the propagation path with the smaller signal attenuation level consumes extra power.

Further, in the conventional control system, the radio signals are transmitted with the same output on the assumption that the radio sensitivities of both radio stations are the same. Therefore, in the communication between radio stations having different reception sensitivities, both radio stations are suitable. It is not possible to receive at the reception level. In this case, the transmission output that matches the wireless station with the lower receiving sensitivity is selected, so when transmitting from the wireless station with the lower receiving sensitivity to the wireless station with the higher receiving sensitivity,
It consumes extra power.

[0006]

According to a first aspect of the present invention, at least two wireless stations that communicate with each other via a wireless propagation path are provided respectively, and the transmission output of each wireless station is set to the wireless propagation path. And a transmission output control device for controlling according to the signal attenuation level in the reception level measuring means for measuring the reception level of the reception frame from the partner station, and the transmission output level information of the partner station from the reception frame. Calculating the signal attenuation level from the partner station to the own station based on the transmission output level information acquiring means, the reception level measured by the reception level measuring means, and the transmission output level information acquired by the transmission output level information acquiring means The signal attenuation level calculation means for performing the transmission output level information of the own station and the signal attenuation level calculation means for the transmission frame to the partner station. Information adding means for adding the information on the signal attenuation level issued, and transmission output level determining means for determining the transmission output level to the other station based on the signal attenuation level information from the other station included in the received frame, Is equipped with.

As described above, according to the first aspect of the invention, the signal attenuation from the partner station to its own station is based on the reception level of the frame received from the partner station and the transmission output level information of the partner station included in the received frame. The level is calculated. Then, the transmission output level information of the own station and the information regarding the calculated signal attenuation level are added to the transmission frame to the partner station. The transmission output level to the partner station is determined based on the signal attenuation level information from the partner station included in the received frame.

As described above, according to the first aspect of the present invention, when the signal attenuation level between the radio stations differs between the uplink and the downlink, the signal attenuation level calculated at the time of receiving the frame is changed to the signal attenuation level at the time of transmitting the next frame. Notify the other station. By mutually performing this operation, the transmission side can control the transmission output so as to transmit at the minimum level that the reception side can receive, based on the signal attenuation level, in each of the up and down directions. As a result, it is possible to eliminate excessive transmission output and reduce power consumption.

Further, by repeating the above operation, even if the signal attenuation level of the propagation path fluctuates during communication, it is possible to control so as to transmit with an appropriate output.

A second aspect of the present invention further comprises a receiving sensitivity level setting means for setting the receiving sensitivity level, wherein the information adding means further receives the own station's reception in the transmission frame to the partner station. Sensitivity level information is added, and the transmission output level determining means determines the transmission output level to the partner station based on the signal attenuation level information from the partner station included in the received frame and the reception sensitivity level of the partner station. Characterize.

As described above, in the second aspect of the invention, each wireless station can set the receiving sensitivity level according to the receiving ability. When transmitting a frame to the partner station, the receiving sensitivity level information of the own station is added to the frame. The partner station acquires this reception sensitivity level when receiving this frame.
Then, when transmitting the next frame from the other station to its own station,
Based on this reception sensitivity level, a transmission output level that allows the local station to receive at an appropriate level is determined. By mutually transmitting and receiving between the wireless stations, each wireless station can mutually know the reception sensitivity level of the partner station.

As described above, according to the second aspect of the invention, when the receiving sensitivity of the partner station is high, the transmission output level of the own station is reduced to perform transmission, and when the receiving sensitivity is low, the transmission output level is set to be low. By increasing the size of the transmission, each wireless station can perform transmission at an output level according to the reception sensitivity of the partner station. As a result, power consumption can be reduced.

Further, by repeating the above operation, even if the receiving sensitivity of each station fluctuates during communication, it is possible to control so as to transmit with an appropriate output.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of a wireless station equipped with a transmission output control device according to a first embodiment of the present invention. In FIG. 1, this wireless station is composed of a receiver 3, a transmission output control device 1, and a transmitter 4. The transmission output control device 1 includes a reception level measuring device 11, a frame analyzer 14, a signal attenuation level calculator 12, a transmission output level calculator 15, and an information adder 13.

Here, the reception level measuring device 11 measures the reception level of the frame received by the receiver 3, and the frame analyzer 14 extracts information on the transmission output level and the signal attenuation level from the received frame. . The signal attenuation level calculator 12 calculates the signal attenuation level from the reception level and the transmission output level from the frame analyzer 14. The transmission output level calculator 15 calculates the transmission output level based on the signal attenuation level extracted from the reception frame by the frame analyzer 14. Information adder 13
Adds the signal attenuation level calculated by the signal attenuation level calculator 12 and the transmission output level calculated by the transmission output level calculator 15 to the frame transmitted from the transmitter 4.

FIG. 2 shows a format of a frame transmitted and received by the wireless station shown in FIG. The frame format 5 is composed of a transmission output level calculated by the transmission output level calculator 15, a signal attenuation level calculated by the signal attenuation level calculator 12, and data to be transmitted.

FIG. 3 shows the signal attenuation level from the own station to the other station and the signal from the other station to the own station when the wireless station shown in FIG. 1 transmits and receives using the frame format 5 of FIG. When the attenuation levels are different from each other, the transmission output control device 1 provided in each wireless station shows a procedure for controlling the transmission output.

Both the wireless station 101 and the wireless station 102 have the same configuration as the wireless station shown in FIG. The propagation from the wireless station 101 to the wireless station 102 is propagation 1, the propagation from the wireless station 102 to the wireless station 101 is propagation 2, and the signal attenuation levels in each propagation are level 2 and level 4. Further, the reception sensitivity levels of the wireless station 101 and the wireless station 102 are both set to level 5. Here, the reception sensitivity level means the minimum reception level that can be received by each wireless station.

The operation of the transmission output control device 1 provided in each of the wireless stations 101 and 102 at the start of communication will be described below. The wireless station 101 transmits the frame 1a to the wireless station 102. At this time, the transmission output level calculator 15
Outputs a default value (level 10) which is a transmission output level sufficient for the other station to receive, and the signal attenuation level calculator 12 has a default value indicating that it has no information for calculating the signal attenuation level. The value (level-1) is output. The default value information is added to the frame 1a having the format shown in FIG. 2 by the information adder 13 and transmitted from the transmitter 4 at the transmission output level 10.

The frame 1a is received by the wireless station 102 as a frame 1b. At this time, the reception level measuring device 11 measures the reception level (level 8) of the frame 1b, and the signal attenuation level calculator 12 calculates the reception level and the transmission output level (the level 8) extracted by the frame analyzer 14 from the frame 1b. Based on the level 10), the signal attenuation level in propagation 1 is calculated by the following equation (1) (level 10-level 8 = level 2). Signal attenuation level = transmission output level-reception level (1)

Next, the wireless station 102 transmits the frame 2a to the wireless station 101. At this time, the transmission output level calculator 15 outputs the default value (level 10) as the transmission output level, as in the transmission of the frame 1a. This default value information is added to the frame 2a together with the signal attenuation level (level 2) previously calculated by the signal attenuation level calculator 12 and transmitted at the transmission output level 10.

The frame 2a is received by the wireless station 101 as a frame 2b. At this time, the reception level measuring device 11 measures the reception level of the frame 2b, and from this reception level (level 6) and the transmission level (level 10) added to the frame 2a, according to the above equation (1), The signal attenuation level in propagation 2 is calculated (level 10-
Level 6 = Level 4).

Then, the wireless station 101 transmits the frame 3a to the wireless station 102. At this time, the transmission output calculator 15 calculates the transmission output level by the following equation (2) based on the signal attenuation level (level 2) of the propagation 1 added to the frame 2b (level 5 + level 2 = Level 7). Transmission output level = reception sensitivity level + signal attenuation level (2)

This transmission output level (level 7) and the previously calculated signal attenuation level of propagation 2 (level 4) are added to the frame 3a and transmitted at the transmission output level 7.

The frame 3a is received by the wireless station 102 as a frame 3b. At this time, the reception level (level 5) of the frame 3b is an appropriate reception level, and it can be seen that the transmission level of the frame 3a was appropriately controlled.

Further subsequently, the wireless station 102 sets the wireless station 10
The frame 4a is transmitted to 1. At this time, the transmitter 4 transmits the frame 4a at the level 9 based on the signal attenuation level (level 4) of the propagation 2 obtained from the frame 3b. At this time, the transmission output level (level 9) and the signal attenuation level (level 2) are added to the frame 4a.

The frame 4a is received by the wireless station 101 as a frame 4b. At this time, it can be seen that the reception level (level 5) of the frame 4b is an appropriate reception level, and the transmission level of the frame 4a is properly controlled.

In this way, even when the signal attenuation level differs between the up and down of the propagation path between the wireless stations, the transmission output control device 1 provided in each wireless station responds to the signal attenuation level in each direction. Thus, the output of the transmitting side can be controlled so that the receiving side can receive at an appropriate level.

Furthermore, the transmission output control device 1 can control the transmission output even if the signal attenuation level of the propagation path fluctuates during communication by repeating these operations for each communication.

FIG. 4 shows the configuration of a wireless station provided with a transmission output control device according to the second embodiment of the present invention. In FIG. 4, this wireless station is composed of a receiver 3, a transmission output control device 2, and a transmitter 4. The transmission output control device 2 includes a reception level measuring device 11 and a frame analyzer 2
4, a signal attenuation level calculator 12, a transmission output level calculator 25, a reception sensitivity level setter 26, and an information adder 23.

Here, the frame analyzer 24 is the receiver 3
Information regarding the transmission output level and the signal attenuation level is extracted from the frame received in step 1, and information regarding the reception sensitivity level is further extracted. The transmission output level calculator 25 calculates the transmission output level based on the signal attenuation level and the reception sensitivity level from the frame analyzer 24. The reception sensitivity level setting device 26 sets the reception sensitivity level according to the reception capability of the own station. The information adder 23 provides information on the signal attenuation level calculated by the signal attenuation level calculator 12, the transmission output level calculated by the transmission output level calculator 25, and the reception sensitivity level from the reception sensitivity level setting unit 26. It is added to the frame transmitted from the transmitter 4. The functions of the reception level measuring device 11 and the signal attenuation level calculating device 12 are the same as those of the corresponding blocks in FIG.

FIG. 5 shows a format of a frame used for transmission and reception in the wireless station shown in FIG. This frame format 6 is the same as the frame format 5 of FIG.
The configuration is such that a reception sensitivity level set by the reception sensitivity level setting device 26 is added.

FIG. 6 is provided for each wireless station when the wireless station shown in FIG. 4 transmits and receives using the frame format 6 of FIG. 5 and the receiving sensitivities of the own station and the partner station are different from each other. The transmission output control device 2 shows a procedure for controlling the transmission output.

Both the wireless station 201 and the wireless station 202 have the same configuration as the wireless station shown in FIG. Propagation from the wireless station 201 to the wireless station 202 and from the wireless station 202 to the wireless station 2
It is assumed that the propagation to 01 is the same as the propagation from the wireless station 101 to the wireless station 102 and the propagation from the wireless station 102 to the wireless station 101 in FIG. That is,
Propagation from the wireless station 201 to the wireless station 202 is propagation 1, propagation from the wireless station 202 to the wireless station 201 is propagation 2, and signal attenuation levels in the respective propagations are level 2 and level 4. In addition, the wireless station 201 and the wireless station 20
It is assumed that the receiving sensitivity levels of 2 are initially set to level 5.

In the following, the wireless station 201 and the wireless station 20 will be described.
2 shows the operation of the transmission output control device 2 provided in each of the above. Similar to the method of controlling the transmission output shown in FIG. 3, the wireless station 201 and the wireless station 202 each calculate a signal attenuation level from the transmission side to the reception side when receiving a frame, and transmit the signal. Side to notify each other, and when transmitting the next frame, calculate the appropriate transmission output level based on this signal attenuation level so that the reception side can receive at the appropriate reception level (level 5). I went.

After that, it is assumed that the reception sensitivity of the wireless station 201 changes and the reception sensitivity level setting unit 26 sets the reception sensitivity level to level 2 in response to the change.

The wireless station 201 is shown in FIG.
When transmitting the frame 5a having the format shown in
In addition to the signal attenuation level of propagation 2 (level 4) and the transmission output level of frame 5a (level 7) calculated in the same manner as the procedure shown in FIG. Reception sensitivity level (level 2)
Is added to the frame 5a.

The frame 5a is received by the wireless station 202 as a frame 5b. At this time, the signal attenuation level calculator 12 uses the reception level (level 5) measured by the reception level measuring device 11 and the transmission output level (level 7) extracted by the frame analyzer 24 by the same method as in FIG. The signal attenuation level is calculated on the basis of (level 7-level 5
= Level 2).

Then, the wireless station 202 transmits the frame 6a to the wireless station 201. At this time, the transmission output level calculator 25 causes the frame analyzer 24 to
Based on the signal attenuation level (level 4) and the reception sensitivity level (level 2) extracted from b, the transmission output level of the frame 6a is calculated by the above equation (2) (level 2 + level 4 = level 6). ).

The frame 6a is received by the wireless station 201 as a frame 6b. At this time, the reception level (level 2) of the frame 6b is an appropriate reception level, and it can be seen that the frame 6a was controlled by the wireless station 202 to have an appropriate transmission output.

In this way, even when the reception sensitivity levels of the own station and the partner station are different from each other, the transmission output control device 2 provided in each radio station has an appropriate reception side according to the reception sensitivity level of each station. The output of the sender can be controlled so that the level can be received.

Further, the transmission output control device 2 can control the transmission output even if the reception sensitivity level fluctuates during communication by repeating these operations for each communication.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a wireless station including a transmission output control device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a frame format used for transmission and reception in a wireless station including the transmission output control device according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a transmission output control sequence of the transmission output control device according to the first embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a wireless station including a transmission output control device according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a frame format used for transmission and reception in a wireless station including a transmission output control device according to a second embodiment of the present invention.

FIG. 6 is a diagram showing a transmission output control sequence of a transmission output control device according to a second embodiment of the present invention.

[Explanation of symbols]

 1 transmission output control device 2 transmission output control device 3 receiver 4 transmitter 5 frame format 6 frame format 11 reception level measuring device 12 signal attenuation level calculator 13 information adder 14 frame analyzer 15 transmission output level calculator 23 information addition 24 frame analyzer 25 transmission output level calculator 26 reception sensitivity level setter 101 wireless station 102 wireless station 201 wireless station 202 wireless station

Claims (2)

[Claims] 1. A transmission output control which is provided in each of at least two radio stations that communicate with each other via a radio propagation path and controls the transmission output of each radio station according to a signal attenuation level in the radio propagation path. A device, a reception level measuring unit for measuring a reception level of a reception frame from a partner station, a transmission output level information acquiring unit for acquiring a transmission output level information of the partner station from the reception frame, and the reception level measurement Signal attenuation level calculating means for calculating the signal attenuation level from the partner station to the own station based on the reception level measured by the means and the transmission output level information acquired by the transmission output level information acquiring means, and to the partner station Of the transmission output level information of the own station and the signal attenuation level calculated by the signal attenuation level calculation means. And a transmission output level determining means for determining a transmission output level to the partner station based on the signal attenuation level information from the partner station included in the received frame. Control device. 2. A reception sensitivity level setting means for setting a reception sensitivity level, wherein the information addition means further adds reception sensitivity level information of the own station to a transmission frame to the partner station, The output level determining means determines the transmission output level to the partner station based on the signal attenuation level information from the partner station and the reception sensitivity level of the partner station included in the received frame. The transmission output control device according to.