JPH0481370B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a channel access type radio having a plurality of call channels and at least one connection control channel, and which searches for an empty channel and designates a call channel when starting a call. Related to communication devices.

[Conventional technology]

Conventionally, in this type of wireless communication device, for example,
As shown in No. 59-95739, the automatic search for empty channels at the start of a call is now a random search. Conversely, when attempting to receive a channel on which a call is currently being made, a random search is performed as well.

[Problem that the invention seeks to solve]

Therefore, there is a problem in that it takes time to search for an empty channel among all communication channels.

The present invention addresses this problem and aims to shorten the search time for an empty channel at the start of a call, thereby enabling quick channel access.

[Means for solving problems]

To this end, the present invention provides a storage means that receives a control signal communicated on a connection control channel when a call is not made and sequentially stores call channel numbers specified between other stations, and stores the stored channel number when a call is started. An empty channel search means is provided for searching for an empty channel by lowering the priority of the channel.

[Effect]

According to the above configuration, taking into account that the newer the channel number stored in the storage means is, the higher the probability that it is being used between other stations, the search for an empty channel is given priority to other call channels. Therefore, the channel is accessed by efficiently performing a search operation for empty channels.

〔Example〕

The present invention will be explained in detail below with reference to embodiments shown in the drawings. In the overall configuration diagram of FIG. 1, reference numeral 1 denotes an antenna switching section that switches the connection of the receiving antenna. Reference numeral 2 denotes a transmitter that transmits wireless communication.
The synthesizer 3 is a frequency generator for wireless communication, and when a channel is set here, the wireless communication device transmits and receives on that communication channel. Reference numeral 4 denotes a receiving section that receives wireless communications, and is capable of receiving and demodulating control signals for connection control.

The control circuit 5 performs various controls for wireless communication, and is composed of a microcomputer that has data input/output with other parts, memory data writing/reading, and various arithmetic functions. The empty channel determination circuit 6 determines whether or not the channel being received by the receiving unit 4 is being used, and the control circuit 5
Enter.

The storage circuit 7 is a part that is connected to the control circuit 5 and stores data. In this embodiment, the storage circuit 7 is a part that can store the channel numbers of all communication channels or data corresponding thereto, and can store the channel numbers of all communication channels or data corresponding thereto. Memorize the numbers in sequence. Also,
The memory circuit 7 can be freely read and written by the control circuit 5, and furthermore, the memory circuit 7 stores data so that the order in which the data is written can be known. Modem 8 is
The control signal demodulated by the receiver 4 is input to the control circuit 5 as digital data. Antenna 9 is a transmitting and receiving antenna for wireless communication.

Next, the operation of the above configuration will be explained.
During standby during non-call time, as shown in the flowchart of FIG. 2, data corresponding to the connection control channel is input from the control circuit 5 to the synthesizer 3, and the receiving frequency of the receiver 4 is set to the connection control channel. At this time, a control signal for specifying a channel between other stations can be received. This control signal is digitized by the modem 8 and input to the control circuit 5. In the control circuit 5,
The control signal is decoded and the channel number of the specified channel is extracted as data.

The channel numbers currently stored in the memory circuit 7 are divided into groups A and B. Initially, the channel numbers of all call channels are stored as group A. Therefore, the control circuit 5
The channel number extracted in step 2 is deleted from group A and stored as group B. This memory operation is repeated sequentially. The above operation is performed when the control signal is successfully received.

Next, regarding the search for an empty channel at the start of a call, as shown in the flowchart in Figure 3, due to the previous operations, the channel with the channel number stored as group B has been searched for by other stations. This is a channel designated for calls between parties, so there is a high probability that it is being used.

Therefore, when searching for empty channels, group A
The control circuit 5 reads out the channel number stored in the memory circuit 7 as
Set to As a result, the reception channel of the receiving section 4 changes, and the empty channel determination circuit 6 performs an empty channel determination. If it is in use, the empty channel determination circuit 6 inputs that fact to the control circuit 5. Then, the control circuit 5 reads another channel number stored as group A from the storage circuit 7 and performs the same operation.

If all channels with channel numbers stored as group A in the storage circuit 7,
If you search for an empty channel and it is found to be in use,
Among the channel numbers stored as group B, the oldest stored channel numbers are read out and the same operation is performed. All the channel numbers stored in the storage circuit 7 are searched, and if they are all in use, it means that all the communication channels are in use, and the process moves to the next step.

Furthermore, when it is desired to monitor calls on any channel, as shown in the flowchart of FIG. Read it, set it to synthesizer 3, and perform a monitor search. If all channels with channel numbers stored as group B are searched and no call is being made, the group A is read out and the same processing is performed. If all the channels with the channel numbers stored in the memory circuit 7 are searched and found to be unused, the memory circuit 7 is reset and the channel numbers of all the communication channels are group A.
is stored as.

According to the above embodiment, when searching for an empty channel from among all call channels, priority is given to a channel number with a high probability that it has not been used by another station immediately before searching, and the search is performed sequentially. It becomes possible to shorten the search time for the empty channel compared to the case of a search.

[Second Embodiment] When the wireless communication device is powered on, all call channels are stored as group A in the storage circuit 7, and empty channels are sequentially determined for all call channels, and channels in use are determined. By deleting the channel number from group A and storing it as group B, it becomes possible to efficiently perform a channel search immediately after the power is turned on.

[Third embodiment] The control circuit 5 is provided with a timer function, and the group B
Among the channel numbers stored as group B, if a certain period of time has passed since they were written, by deleting them from group B, it is possible to increase the probability that channels with channel numbers stored as group B are being used. I can do it.

[Fourth embodiment] The control circuit 5 is provided with a timer function, and the group B
Among the channel numbers stored as , for those for which a certain period of time has elapsed since being written, the channel is set in the synthesizer 3 at regular time intervals to determine whether it is an empty channel. If it is determined that the channel is empty, the channel number is deleted from group B and stored as group A.

[Fifth Embodiment] In the previous embodiments, the channel numbers stored in the storage circuit 7 were considered separately into groups A and B, but there is also a method of considering the stored channel numbers as columns. In this case, when a control signal is input, the channel number of the specified channel is replaced in this column and brought to the beginning of the column. This means that the channel with the channel number at the beginning of the column has the highest probability of being used.
The channel with the last channel number in the column has the lowest probability of being used. Therefore, a search for empty channels is performed sequentially from the end of the column.

〔Effect of the invention〕

As described above, in the present invention, the channel numbers used between other stations during non-calling are sequentially stored, and priorities are determined based on the probability of being used among all call channels. Accordingly, the search for an empty channel at the time of starting a call can be made more efficient, the channel search time can be shortened, and the call can be started quickly, which is an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is a flowchart showing the standby operation, FIG. 3 is a flowchart showing the empty channel search operation, and FIG. 4 is a flowchart showing the monitor search operation. 1... Antenna switching unit, 2... Transmitting unit, 3...
Synthesizer, 4... Receiving section, 5, 6... A control circuit having an empty channel search means and an empty channel determining circuit, 7... A storage circuit serving as a storage means.

Claims (1)

[Claims] 1. A channel access method that has a plurality of call channels and at least one connection control channel, and selects an empty channel from among the call channels at the start of a call, designates it as the call channel, and conducts a call. In the wireless communication device, storage means receives control signals communicated through the connection control channel during non-call periods and sequentially stores communication channel numbers designated between other stations; and an empty channel search means for searching for an empty channel by lowering the priority of the channel number that has been accessed.