JPH07288560A - Communication method by unconfirmed frame - Google Patents

Abstract

PURPOSE:To attain efficient communication by providing a number of times of transmission setting means detecting a state of a radio channel and setting an optimum number of times of transmission in the state of the radio channel to the method and setting an optimum repetitive number of times of transmission automatically even when the state of the radio channel is deteriorated or improved so as to send repetitively transmission request data by the setting number of times thereby improving the probability of normal reception. CONSTITUTION:A state of a radio channel is detected by a slot control task 31 of a layer 3. A reception task 33 receives radio channel state information such as a bit error rate and a reception level in a layer 1 together with reception data sent from the layer 1 via a data memory 34 from a transmission task 21 and transfers the information to a slot control task 31. The slot control task 31 based on the information above calculates an optimum number of times of transmission of transmission request data going to be sent and sets the result of calculation as a parameter. A transmission task 32 of the layer 3 at the sender side sends same transmission request data repetitively according to the number of times of transmission.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-confirmation type frame communication method in which, when digital communication is carried out wirelessly, the number of transmissions of transmission request data is set depending on the radio condition and is repeatedly transmitted.

[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). For reception, layer 2 receives data from layer 1 and passes several frames together to layer 3. In the case of transmission, layer 3 prepares layer 2 data, and layer 2 decomposes the data into a format frame which can be processed by layer 1 and passes it. The data is organized in a form that facilitates man-machine communication as it goes up.

FIG. 7 is a diagram showing an example of the configuration of communication processing tasks of layer 2 and layer 3. As shown in the figure, the layer 1 is composed of a transmitting / receiving unit 10 which performs processing at a level of directly transmitting / receiving data, and the task of the layer 2 is a transmission task 21 for preparing transmission data to the layer 3 and a layer 3 from the layer 3. Reception task 22 for processing reception data, control channel task 23 for controlling control channel, protocol processing task 24 for processing protocol, speech channel task 25 for controlling speech channel, transmission data to layer 1
A transmission pointer 26 for designating a pointer for data, a reception buffer 27 for reception data from layer 1, a modem interface task 28, etc., and is executed by the CPU 20.

The layer 3 task is a slot control task 31 for controlling each task of transmission and reception, and a transmission data to the layer 2
Data from the transmission task 32, layer 2
The CPU 30 includes a reception task 33 that processes the data.

The CPU 20 and the CPU 30 are independent CPUs, use a shared data memory (RAM) 34 for storing input / output data, and activate each task by an interrupt signal to process the input / output data. is doing.

There are non-confirmation type and confirmation type transmission formats.
6A and 6B are diagrams showing an example of the format of unconfirmed transmission request data. FIG. 7A shows the format, and FIG. 7B shows an example of the data. At the time of transmission, the layer 3 slot control task 31 instructs the transmission task 32, and the transmission task 32 stores the transmission data in the data memory 34 according to FIG.

The length indicates the number of bytes of the primitive code + the number of bytes of the primitive parameter + the number of bytes of the data. The primitive code is a confirmation type (I frame).
Alternatively, it indicates a non-confirmation type (UI frame). Primitive parameters are used to specify the mail box and link, followed by data. The example data shown in FIG. 3B is RT.
(Wireless management) It is an example of a wireless channel. The length of data (the number of bytes) is specified by the length and is variable.

At the layer 3, the transmission task 32 stores data according to the format of FIG. 3 (a) in a data memory (RAM).
When prepared in 34, the CPU 30 outputs an interrupt signal to the CPU 20. The CPU 20 activates the reception task 22,
The reception task 22 transfers the data in the data memory 34 to the protocol processing task 24, and the protocol processing task 2
Reference numeral 4 converts the data in the data memory 34 into a format to be transmitted in layer 1.

FIG. 4 is a diagram showing an example of the format of transmission data by the non-confirmation type frame. The first 3 bytes are called a control field and are a non-confirmation type UI frame.
Data, remaining data length, information combination bit, and other control information, followed by data.

The maximum memory capacity for writing the above data is 2
Since it is 0 bytes, the data length received from layer 3 is 20
When the number of bytes exceeds the limit, it is divided into a plurality of frames for transmission. Information coupling bit of control field is 1
Frame represents the final frame, and the information combination bit is 0.
Frame represents an intermediate frame. The remaining data length of the control field represents the number of bytes of data actually transmitted in the memory capacity.

FIG. 5 is a diagram showing a frame sequence of a communication method using a conventional non-confirmation type frame. When there is unconfirmed transmission request data from layer 3, for example, when the length of transmission data A is 40 to 60 bytes, layer 2 transmits three transmissions according to the format shown in FIG. It is divided into frames and transmitted to the other party via layer 1.

The information combining bit is set to 1 in the final transmission frame. It is confirmed that all frames in the layer 2 protocol processing task 24 on the receiving side are prepared,
The data is assembled and transmitted to the transmission task 21, and the transmission task 2
1 stores data in the data memory 34 and issues an interrupt signal to the CPU 30. The CPU 30 activates the layer 3 reception task 33, receives the reception data A from the data memory 34, and processes it. Since it is efficient, the communication method by the non-confirmation type frame is often adopted when the radio condition is good.

FIG. 6 is a diagram showing a frame sequence of a communication method using a conventional confirmation type frame. Confirmation type transmission request data D (for example, 40 to
If there is 60 bytes), it is received by the layer 2 on the receiving side in the same manner as described above. A frame sequence number N is attached to the control field of the confirmation frame, and the frame sequence number N is confirmed every time the receiving side layer 2 confirms the final transmission frame. If all of them are complete, a confirmation signal is sent to the layer 2 on the transmission side, and if the radio condition is poor and the frame is missing, a retransmission request signal is output from that frame. When the radio condition is poor, confirmation is necessary, so a communication method using a confirmation frame is adopted. However, since the confirmation type requires confirmation by the transmitting side and the receiving side for each final frame, it is often inconvenient if it is inefficient and the radio condition is good.

[0014]

However, in the conventional unconfirmed frame communication method, as shown in the transmission request data B of FIG. 5, the middle frame is received due to deterioration of the radio condition. If not, the final transmission frame cannot be determined by the receiving layer 2. Therefore, the receiving layer 2
Will be combined with the transmission frame of the next transmission request data C, and the frame will be combined as the reception data B and passed to the layer 3. This reception data B is discarded by the reception side layer 3 and the sequence does not proceed.

As described above, if the radio condition deteriorates during the data transmission, the final frame of the information coupling bit = 1 may be lost. As a result, the two transmission request data B and the transmission request data C intended to be transmitted by the transmitting side are received as one primitive data by the receiving side and discarded at layer 3. There is a problem that discarding two primitive data due to lack of only one frame is very inefficient.

The present invention has been made in view of the above points, and eliminates the above-mentioned problems and provides an unconfirmed frame in which the optimum number of times of transmission is automatically set according to the radio condition and the transmission is efficiently performed. It is intended to provide a communication method.

[0017]

In order to solve the above problems, the present invention has an unconfirmed frame of wireless digital communication which has a transmitter and a receiver and communicates with a partner station by an unconfirmed frame. In the communication method by the mobile phone, as shown in FIG.
A transmission number setting means for detecting a radio state from radio state information such as a reception level generated in the receiving unit and a bit error occurrence rate, and setting an optimum number of transmission repetitions in the radio state,
It is characterized in that a transmission means is provided for repeatedly transmitting the transmission request data by the transmission section a designated number of times, and the transmission request data is repeatedly transmitted in accordance with the transmission number set by the transmission number setting means.

In the communication method using the non-confirmation type frame, a continuous set of normal reception data is received from the reception data repeatedly transmitted from the partner station and received by the receiving section. It is characterized in that means for selecting is provided.

[0019]

The present invention detects the wireless condition as described above,
Since the transmission number setting means for setting the optimum number of transmissions in the wireless state is provided, the optimal number of repetitions is automatically set even when the wireless state deteriorates or improves, and the transmission request data is set by the set number of times. Since the data is repeatedly transmitted, the probability of being normally received by the partner station is high regardless of the radio condition, and moreover, since it is a non-confirmation type, efficient communication is possible.

[0020]

【Example】

[Embodiment 1] An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a diagram showing a frame sequence of a communication method according to the non-confirmation type frame of the present invention. The configuration of the communication processing tasks of the layer 2 and the layer 3 is as shown in FIG.

In the communication method of FIG. 1, the layer 3 slot control task 31 detects the radio condition. Further, the transmission / reception unit 10 of Layer 1 is provided with a reception signal detection unit, where radio state information such as a reception level and a bit error occurrence rate of the reception signal is generated. That is, together with the reception data sent from layer 1, the bit error rate generated in layer 1,
The reception task 33 receives the reception level and the like from the transmission task 21 of layer 2 via the data memory 34 as radio state information, and passes this to the slot control task 31. Based on these pieces of information, the slot control task 31 calculates the optimum number of times of transmission request data to be transmitted from now on and sets it as a parameter.

On the transmitting side, the layer 3 transmission task 32
Repeatedly transmits the same transmission request data according to the number of transmissions (three times in the figure). The transmission and reception operations are the same as the above-mentioned conventional ones, and thus the description thereof is omitted. When the frame for the first transmission, the frame for the second transmission, and the frame for the third transmission are missing depending on the radio condition, the layer 2 is received on the receiving side.
The protocol processing task 24 of the above combines frames and transfers them to the transmission task 21 of the layer 2 triggered by the reception of the frame, and the transmission task 21 of the layer 2 sets data in the data memory 34 and Is passed to the reception task 33 of layer 3 by interrupting. The reception task 33 of the layer 3 checks according to the format of unconfirmed transmission request data (see FIG. 3) and cuts out continuous frames as reception data.

If the frame or the frame is missing in the first transmission and the frame is received, the received data is passed from the layer 2 to the layer 3 in a state where the frames are not continuous. , The data of this received frame is checked by the receiving task 33 and discarded, but since the same transmission request data is repeatedly transmitted the number of times set according to the radio condition, the frame of the received frame after the discard is A continuous state can be obtained.

[Embodiment 2] FIG. 2 is a diagram showing a frame sequence of a communication method by the non-confirmation type frame of the present invention. In the communication method of FIG. 2, the wireless state is detected by the layer 2 protocol processing task 24. That is, the protocol processing task 24 can obtain the radio status information from the bit error occurrence rate, reception level, etc. of the reception data sent from the layer 1 through the reception buffer 27. Based on the wireless status information, the protocol processing task 24 calculates and sets the optimum number of times of transmission request data to be transmitted.

Protocol processing task 2 of the transmitting side layer 2
4 receives the layer 3 transmission request data from the reception task 22, and repeatedly transmits the transmission request data according to the number of transmissions. Subsequent processing is the same as that described with reference to FIG.

As described above, in the communication method of the present invention, the optimum number of times of transmission is determined according to the radio condition and the data is transmitted, so that the primitive data is less likely to be discarded due to the lack of the frame, and the efficiency is improved. Good communication is possible.

[0027]

As described in detail above, according to the present invention, the following excellent effects are expected. Since the present invention is provided with the transmission number setting means for detecting the wireless state and setting the optimal number of transmissions in the wireless state, the optimal number of repetitions is automatically set even when the wireless state deteriorates or improves. Since the transmission request data is repeatedly transmitted by the set number of times, the probability of being normally received by the partner station is high regardless of the radio conditions, and moreover, it is an unconfirmed type, which enables efficient communication. .

[Brief description of drawings]

FIG. 1 is a diagram showing a frame sequence of a communication method using an unconfirmed frame according to the present invention.

FIG. 2 is a diagram showing a frame sequence of a communication method according to the non-confirmation type frame of the present invention.

3A and 3B are diagrams showing an example of a format of non-confirmation type transmission request data, FIG. 3A is a diagram showing the format, and FIG. 3B is a diagram showing an example of the data. .

FIG. 4 is a diagram showing an example of a format of transmission data by an unconfirmed frame.

FIG. 5 is a diagram showing a frame sequence of a communication method using a conventional non-confirmation type frame.

FIG. 6 is a frame of a communication method using a conventional confirmation frame.
It is a figure which shows Musi-Kens.

FIG. 7 is a diagram showing a configuration example of a layer 2 and layer 3 communication processing task.

[Explanation of symbols]

 10 transmitter / receiver 20 CPU 21 send task 22 receive task 23 control channel task 24 protocol processing task 25 call channel task 26 send pointer 27 receive buffer 28 modem interface task 30 CPU 31 slot control task 32 send task 33 receive task 34 de -Memory

Claims (2)

[Claims] 1. A communication method by a non-confirmation type frame of wireless digital communication, which has a transmission section and a reception section, and communicates with a partner station by the non-confirmation type frame, wherein a reception level generated in the reception section. , A transmission number setting means for detecting a radio state from radio state information such as a bit error occurrence rate, and setting an optimum number of transmission repetitions in the radio state,
The transmitting unit is provided with a transmission unit for repeatedly transmitting the transmission request data a designated number of times, and the transmission request data is repeatedly transmitted according to the transmission number set by the transmission number setting unit. Communication method by confirmation type frame. 2. The communication method according to the non-confirmation type frame according to claim 1, wherein a continuous set of normal reception is included in the reception data repeatedly transmitted from the partner station and received by the receiving unit. The communication method according to the non-confirmation type frame according to claim 1, further comprising means for selecting data.