JPH08149133A - Radio network system - Google Patents

Abstract

PURPOSE: To provide a radio network system whose throughput is improved by reporting a reception channel of a concerned equipment to other equipments in the system, registering the reported reception channel to control congestion based on the registered reception channels thereby simplifying channel designation. CONSTITUTION: When a radio adaptor in the packet reception wait state from a terminal equipment 109 receives a packet by a LAN controller 105, a terminal equipment registration table 110 is referenced to and whether or not a reception frequency (channel) of a destination terminal equipment is registered is confirmed. When the frequency (channel) is registered, a radio section 102 starts congestion control in matching with the frequency and when an idle channel is confirmed, the transmission is started. Thus, the throughput is improved by fixing the respectively frequency (channel) to avoid hand-shake and the frequencies (channels) used for the entire system are made distributed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spread spectrum / radio network system of a low frequency frequency hopping system, and more particularly to a communication channel setting system.

[0002]

2. Description of the Related Art In low-frequency frequency hopping spread spectrum / wireless communication, data is decomposed into a plurality of sets of frequency channels for communication, so that even if there is a noise such as noise in a specific frequency band, it is not easily affected.

In order to realize this method, it is necessary to select the same frequency channel in synchronization on both sides of transmission and reception.

Generally, there are the following methods as the channel selection method. 1) Indicate the data transmission channel to the receiving side on a specific control channel. 2) Transmission / reception by handshaking on a specific control channel The data transmission channel is determined by negotiation between both sides. 3) The first channel is fixed in the entire system (all devices).

[0005]

However, the above-mentioned conventional example has the following drawbacks. 1) When a specific channel is used as a control channel, or when the first channel is fixed and used in the entire system, the traffic concentrates on the specific channel, which lowers the throughput. 2) In the case of the method using the handshake, the time required for the handshake is added to the above 1), so that the throughput is further reduced.

The present invention has been made to solve the above problems, and provides a wireless network system that simplifies channel designation by registering a receiving channel for each device and improves throughput. With the goal.

[0007]

In order to achieve the above object, the wireless network system of the present invention has the following configuration.

That is, in a low frequency frequency hopping spread spectrum / wireless network system for performing data communication through a plurality of frequency channels, a notifying means for notifying the receiving channel of its own device to other devices in the system, and the notifying means. Registration means for registering the reception channel notified by the above, and control means for controlling competition by the reception channel registered by the registration means.

[0009]

In such a configuration, the receiving channel of data is notified by notifying the receiving channel of the own device to other devices in the system, registering the notified receiving channel, and controlling the competition by the registered receiving channel. It is characterized in that it is fixed for each device and the channel is specified without using handshaking.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a wireless adapter device according to this embodiment. In the figure, 10
Reference numeral 1 is a transmitting / receiving antenna, 102 is a wireless unit that performs modulation / demodulation of wireless data, 103 is a bit synchronization circuit, 104 is communication control, a communication controller that performs frame (packet) generation / decomposition processing, and the like, 105 is a LAN controller, 1
06 is an error correction encoder / decoder for performing FEC, 1
Reference numeral 07 is a CPU, 108 is a memory, 109 is a communication terminal having a LAN interface, and 110 is a table for registering a reception frequency (channel) for each wireless adapter device in the present system.

Next, the operation of the wireless LAN system in this embodiment will be described below with reference to FIGS. 2 to 5. FIG. 2 is a flowchart showing the operation of the wireless adapter device during transmission.

FIG. 3 is a flow chart showing the operation of the wireless adapter device at startup (power-on).

FIG. 4 is a flow chart showing the operation of the wireless adapter device during reception.

FIG. 5 is a terminal registration table 110 shown in FIG.
It is a figure which shows the structural example. As shown in the figure, the terminal registration table 109 has a terminal address and a reception frequency (channel).
It consists of 1) Operation During Transmission First, in step S201, the wireless adapter device waiting for packet reception from the terminal 109 is
When the controller 105 receives the packet, the process proceeds from step S202 to step S203, refers to the terminal registration table 110, and in the following step S204, it is confirmed whether or not the reception frequency (channel) of the destination terminal is registered. Here, when the frequency (channel) is registered, the process proceeds to a known transmission process, the radio unit 102 is adjusted to the frequency, contention control is performed, and if the empty channel is confirmed, the signal is transmitted.

On the other hand, if the reception frequency (channel) of the destination terminal is not registered in step S204, the process proceeds to step S205, and it is confirmed in the terminal registration table 110 whether or not an empty channel exists. Here, if there is no empty channel, the process proceeds to step S211, and the terminal 10
The communication with 9 is disconnected, and the process proceeds to step S201 described above. If there is an empty channel, step S20.
In step 6, the communication controller 104 creates a packet for detecting a terminal, sets the radio unit 102 to the frequency of an empty channel, and transmits the above-mentioned packet for a certain time.

Next, in step S207, it is confirmed whether or not a response is received on the empty channel within a fixed time. Here, if no response is received, it is determined that there is no reception waiting terminal, and the operation proceeds to terminal confirmation operation on the next empty channel. This operation is repeated until there are no empty channels.

If a response is received within a fixed time in step S207, the process proceeds to step S208.
Check the address of the reply destination. Here, when the confirmed address is the transmission partner, the process shifts to the transmission process. However, if the confirmed address is not the transmission partner, step S21
0, records the address and frequency (channel) in the terminal registration table 110, and returns to step S205,
The operation shifts to the terminal confirmation operation on the remaining empty channels. 2) Operation at power-on When the wireless adapter device starts up, first, the wireless unit 102
Is set to the reception state on the channel N, and the channel is monitored for a certain period of time (step S301). After that, in step S302, it is confirmed whether or not there is a terminal using the channel, and if there is a terminal in use, step S3
At 06, the address of the terminal is confirmed and recorded in the terminal registration table 110.

However, if there is no terminal that uses the channel in step S302, the process proceeds to step S303, the communication controller 104 creates a packet of a channel request, sets the wireless unit 102 in the transmission mode, and transmits the packet. After the transmission is completed, the process proceeds to step S304,
The wireless unit 102 is set to the reception mode and waits for a response.

Next, in step S305, it is confirmed whether or not there is a response within a fixed time. If there is no response,
It is determined that there is no device using the channel, and a transition is made to a reception standby state for this channel. On the other hand, when the response is received within the fixed time, the process proceeds to step S306 described above,
The address of the terminal is recorded in the terminal registration table 110.

Then, in step S307, the value of the counter is incremented (+1), and step S30
At 8, it is determined whether the value of the counter has reached the maximum number of available channels. If the counter value does not exceed the maximum number of channels, the process returns to step S301,
Check the next channel. On the other hand, if the counter value exceeds the maximum number of channels, the process proceeds to step S309,
The counter value is cleared (N = 0), and the subsequent step S3
After waiting for a certain period of time at 10, the process returns to step S301 to check whether the channel is used from the first channel. 3) Operation at the time of reception First, in step S401, a standby state for receiving a wireless packet on the channel determined by the above-described operation at power-on is set, and if a wireless packet is received at step S402, the process proceeds to step S403, The type of packet received by the communication controller 104 is determined. As a result, when the received packet is a data packet, the process proceeds to a data receiving process.

On the other hand, in step S404, if the received packet is not a data packet, step S4
In step 05, it is determined whether the packet is a channel request or a terminal detection packet. Here, in the case of a channel request or terminal detection packet, the process proceeds to step S406, the communication controller 104 generates a response packet, and the response packet created by setting the wireless unit 102 in the transmission mode is transmitted. After that, when the transmission is completed, the wireless unit 102 is set to the reception mode, and the process proceeds to step S401.

However, in step S405, if the received packet is none of the above, step S405.
In step 407, the received packet is discarded, and the wireless unit 10
2 is set to the reception mode, and the process proceeds to step S401.

According to this embodiment, by fixing the reception frequency (channel) of the first frame and eliminating the handshake, the throughput is improved and the frequencies (channels) used in the entire system can be dispersed.

The present invention may be applied to either a system composed of a plurality of devices or an apparatus composed of a single device. It goes without saying that the present invention can also be applied to the case where it is achieved by supplying a program to a system or an apparatus.

[0026]

As described above, according to the present invention,
By registering the reception channel for each device, it becomes possible to simplify the channel designation and provide a wireless network system with improved throughput.

[0027]

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a wireless adapter device.

FIG. 2 is a flowchart showing an operation of the wireless adapter device during transmission.

FIG. 3 is a flowchart showing an operation when the power of the wireless adapter device is turned on.

FIG. 4 is a flowchart showing an operation of the wireless adapter device during reception.

5 is a diagram showing a configuration of a terminal registration table shown in FIG.

[Explanation of symbols]

 101 Transmitting / Receiving Antenna 102 Radio Unit 103 Bit Synchronous Circuit 104 Communication Controller 105 LAN Controller 106 Error Correction Encoder / Decoder 107 CPU 108 Memory 109 Communication Terminal 110 Terminal Registration Table

Claims (3)

[Claims] 1. A low-frequency hopping spread spectrum / wireless network system for communicating data using a plurality of frequency channels, notifying means for notifying a receiving channel of its own device to other devices in the system, and the notifying device. A wireless network system comprising: a registration unit that registers the reception channel notified by the registration unit; and a control unit that controls contention by the reception channel registered by the registration unit. 2. The registration means registers a device address and a reception channel to be used.
The wireless network system described. 3. The wireless network system according to claim 2, wherein the registration unit registers a reception channel used for each device as a table.