JPH088817A - Radio transmission output control method - Google Patents

Abstract

PURPOSE:To automatically the communication state by detecting a radio channel state with increase/decrease in number of times of re-transmission on the occurrence of a transmission fault so as to adjust a radio transmission output based on the radio channel state of a transmitter side and to adjust number of times of re-transmission, thereby making a request of a radio transmission output adjustment to an opposite station. CONSTITUTION:A protocol processing task 24 of a layer 2 of a transmitter side confirms a channel while making communication of a channel monitor command to an opposite station once for every two-three second period. When number of times of re-transmission is increased, the protocol processing task 24 regards it that a radio channel state is deteriorated and gives a command to a transmission reception section 10 of a layer 1 thereby allowing the section 10 to increase a radio transmission output. Moreover, number of times of re-transmission setting of a command frame is set increasingly. When a reception level is further decreased, a radio transmission output increase is requested for the opposite station. The reception level is detected in the form of a reception signal of the transmission reception section 10 of the layer 1. After the control, the protocol processing task 24 of the layer 2 sends data from a layer 3 of its own station to the opposite station.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless transmission output control method for controlling a wireless transmission output by detecting a wireless state at a transmitting side in wireless digital communication.

[0002]

2. Description of the Related Art In communication devices currently in use,
The data is processed by a processing system having a multi-tiered hierarchical structure. Layer 1 (first layer) performs the data format processing at the lowermost layer, and performs the processing of the level of directly transmitting / receiving the data (including the hardware such as a modem and an amplifier).

In the case of reception, layer 2 is delayed from layer 1.
Data, and several frames are collectively passed to layer 3. In the case of transmission, layer 3 prepares layer 2 data, and layer 2 decomposes the data into a format frame that can be processed by layer 1 and passes it. The data is arranged in a form that facilitates man-machine communication as it goes up.

FIG. 3 is a diagram showing a configuration example of a layer 2 communication processing task. As shown, the layer 1 is directly
The layer 2 task includes a transmission task 21 that prepares transmission data to the layer 3, a reception task 22 that delivers reception data from the layer 3, Control channel task 23 for controlling the control channel, protocol processing task 24 for processing the protocol, call channel task 25 for controlling the call channel, send pointer 26 for pointing the pointer of the send data to layer 1, layer Received data from 1
A reception buffer 27 for storing data, a modem interface task 28, etc., and is executed by the CPU 20.

Layer 2 CPU 20 and Layer 3 CPU
Reference numeral 30 denotes an independent CPU, which uses a shared data memory (RAM) 31 for storing input / output data, activates each task by an interrupt signal, and processes the input / output data.

There are a non-confirmation type and a confirmation type in the wireless transmission format, and the layer 3 on the transmitting side specifies which format is used for communication. When transmitting from the self-station with the confirmation-type command frame, the protocol processing task 24 repeats the re-transmission a prescribed number of times (set number of times) until there is a response from the partner station.

Further, when transmitting by the non-confirmation type command frame, there is no response from the other party, and each command frame is transmitted sequentially according to the sequence. Further, the protocol processing task 24 commands the transceiver 10 to increase or decrease the wireless transmission output, and the transceiver 10 can adjust the wireless transmission output according to the command. Further, the transmission / reception unit 10 can detect the reception level from the other party and monitor it at the layer 2 (or layer 3).

[0008]

However, when communication is performed by the communication device, the radio condition is not always good. The wireless state of the receiving side can be grasped by constantly monitoring the reception level, but the wireless state of the transmitting side cannot be grasped by the own station. When transmitting with the confirmation frame, if the response cannot be received from the partner station within the set number of times, the sequence will be terminated and interrupted. When the unconfirmed type is transmitted, a plurality of frames are transmitted only once, and therefore, even if one frame is missing, correct information does not reach the partner station. As a result, there is a problem that it takes time because the sequence does not progress and abnormal processing is performed, and transmission is performed again from the beginning.

Further, there is a method of increasing the wireless transmission output, but there is a problem that increasing the wireless transmission output always consumes a large amount of current and shortens the operating time of the battery.

The present invention has been made in view of the above points, and adjusts the radio transmission output according to the radio state of the transmitting side to adjust the number of retransmissions, and further requests the other station to make a radio transmission output adjustment request. It is an object of the present invention to provide a wireless transmission output control method for improving communication conditions.

[0011]

In order to solve the above problems, the present invention provides a reception level detecting means for detecting a reception level,
A wireless transmission output control method for a wireless communication device, comprising wireless transmission output control means for controlling wireless transmission output and retransmission number setting means for setting the number of retransmissions when transmission fails, as shown in FIG. The device detects the wireless status by increasing or decreasing the number of retransmissions at the time of transmission failure, adjusts the wireless transmission output of its own station according to the wireless status, sets the number of retransmissions set to an appropriate value, and further It is characterized in that the partner station is requested to adjust the radio transmission output according to the reception level detected by the level detecting means.

[0012]

According to the wireless transmission output control method of the present invention, the wireless status of the transmitting side of the local station can be grasped in real time by detecting the number of retransmissions. As described above, the wireless communication device detects the wireless status by increasing or decreasing the number of retransmissions, and if the wireless status of the local station deteriorates, increases the wireless transmission output, and further increases the number of retransmission settings. The probability that the transmission data will reach the other station will also increase. When the reception level decreases, the partner station is requested to increase the wireless transmission output, and the communication state is improved. When the wireless condition is restored, the wireless transmission output is reduced and the number of retransmissions is restored. Therefore, the wireless transmission output is automatically adjusted to the optimum output according to the wireless state, the communication state is improved, and the operating time of the battery is extended.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a diagram showing a sequence according to the wireless transmission output control method of the present invention. The sequence will be described with reference to FIG. The following sequence is for the case of transmitting from its own station and is processed by each task shown in FIG.

When there is a DL (data link) setting request from the layer 3 at the own station (source station), the protocol processing task 24 of the layer 2 sends the SABM command (communication path setting command) via the transmission pointer 26 to the partner station ( (S1). The partner station returns a response in the UA frame and displays the DL setting (S2).
When the A response is received and the DL setting is confirmed (S3), communication with the partner station starts.

In the figure, when the wireless condition is good, the DL setting is completed with the number of retransmissions = 0, but when the wireless condition is bad, the retransmission is repeated. RCR Standard Rules (RCR:
10 by default at the Radio System Development Center)
It is retransmitted up to once. When a new communication path is set, the wireless transmission output of the transmission / reception unit 10 starts at a low output regardless of the wireless state.

At the layer 2 on the transmitting side, the protocol processing task 24 confirms the communication path by communicating with the partner station once every 2-3 seconds with a communication path monitoring command (RR). If the response cannot be confirmed, it is retransmitted, but the number of times of retransmission is stored (S4). In the figure, the wireless condition deteriorates and the number of retransmissions =
9 indicates that a response has been received.

It can be said that the wireless condition is good when the number of retransmissions is small, and the wireless condition is deteriorated when the number of retransmissions is large. When the command frame is transmitted by the layer 2 protocol processing task 24, the wireless state of the transmitting side can be constantly grasped in real time by counting the number of retransmissions.

When the number of retransmissions increases, the protocol processing task 24 considers that the wireless condition has deteriorated and issues a command to the layer 1 transceiver 10 to increase the wireless transmission output (S).
5). Further, the command frame retransmission setting number is increased and set. Further, when the reception level decreases, a request for increasing the wireless transmission output is issued to the partner station (S6). The reception level is detected by the reception signal of the layer 1 transmission / reception unit 10.

After performing the above control, the layer 2 protocol processing task 24 transmits the data from its own layer 3 to the partner station (S7), and sends a response from the partner station with a smaller number of retransmissions than the previous time. If it can be received, the wireless condition has been improved. The figure shows that the number of retransmissions has been improved to one (S8).

Then, the wireless transmission output is adjusted to an appropriate value so that the number of times of retransmission of the command frame is reduced (0 times) so that the reception level is maintained at the normal level (S9). Furthermore, when the number of times the command frame is retransmitted is 0 and the reception level is high,
The layer 2 protocol processing task 24 sets the wireless transmission output and the retransmission setting count to the original values (S10).

Further, a request for reducing the wireless transmission output (returning to the original value) is issued to the partner station (S11). Data is transmitted while repeating the control as described above (S1
2) At the end, a disconnection request command (DISC) is sent to the partner station (S13), the partner station releases the communication path and displays (S14), and the own station confirms the response (UA) and finishes.

FIG. 2 is a diagram showing an example of movement of the mobile radio device within the service area of the base station. This figure shows communication between the base station 1 and the mobile wireless device 2. When the mobile wireless device 2 is at position a, the wireless distance is short and the wireless condition is good. To do. When the mobile wireless device 2 moves from the position a to the position b and the wireless distance becomes long, the number of times the command frame is retransmitted increases, and the protocol processing task 24 of the layer 2 detects that the wireless condition has deteriorated and transmits wirelessly. Increase output.

The increase of the radio transmission output is performed in parallel with the detection of the decrease of the reception level, and the fine output control such as the increase width and the duration is performed. The number of times the command frame is retransmitted is increased to request the base station 1 (partner station) to increase the wireless transmission output.

Even if the mobile wireless device 2 moves from the position b to the position c, the wireless transmission output has already been increased, so that the number of times the command frame is retransmitted decreases. However, if the reception level remains low, the request for increasing the wireless transmission output is continued to the base station 1.

Furthermore, if the mobile radio 2 moves from the position c to the position d, the number of times the command frame is retransmitted is reduced (0 times), and it is considered that the radio condition is recovered when the reception level becomes high. After that, it returns to the normal control of the initial setting.

As described above, even in the vicinity of the boundary of the service area of the base station or in a place where the radio condition due to the influence of the building is always unstable, the above control is performed by the own station and the partner station so that the radio transmission output is The optimum output is automatically adjusted in accordance with the wireless condition of, and good communication can be performed.

[0027]

As described above in detail, according to the present invention, the following excellent effects can be expected. (1) The wireless communication device detects the wireless state by increasing or decreasing the number of retransmissions, raises the wireless transmission output when the wireless state of the local station deteriorates, and further increases the retransmission setting number, so the number of retransmissions is increased. The probability that the transmitted data will reach the partner station will increase.

(2) When the reception level decreases, the partner station is requested to increase the radio transmission output, and the communication state is improved.
When the wireless status is restored, the wireless transmission output is reduced and the number of retransmissions is returned to the original value, so the wireless transmission output is automatically adjusted to the optimum output according to the wireless status, the communication status is improved, and the battery operating time is long. Become.

[Brief description of drawings]

FIG. 1 is a diagram showing a sequence according to a wireless transmission output control method of the present invention.

FIG. 2 is a diagram showing an example of movement of a mobile wireless device within a service area of a base station.

FIG. 3 is a diagram showing a configuration example of a layer 2 communication processing task.

[Explanation of symbols]

 10 Transmitter / Receiver Unit 20 CPU (Central Processing Unit) 21 Send Task 22 Receive Task 23 Control Channel Task 24 Protocol Process Task 25 Speech Channel Task 26 Send Pointer 27 Receive Buffer 28 Modem Interface Task 30 CPU 31 Data Memory

Claims (1)

[Claims] 1. A radio of a wireless communication device comprising: a reception level detecting means for detecting a reception level; a wireless transmission output control means for controlling a wireless transmission output; and a retransmission number setting means for setting a retransmission number when transmission fails. In the transmission output control method, the wireless communication device detects a wireless state by increasing or decreasing the number of retransmissions at the time of transmission failure, adjusts the wireless transmission output of the local station according to the wireless state, and appropriately sets the number of retransmissions set. The wireless transmission output control method is characterized in that the other station is requested to adjust the wireless transmission output in accordance with the reception level detected by the reception level detecting means.