JPH0374938A - Radio communication system - Google Patents

Abstract

PURPOSE:To decrease the number of times of changeover of antenna by grouping slave stations using a same antenna as on groups, allowing a master station to make polling to all slave stations using the antenna and to receive a reply and to apply the changeover of a succeeding antenna. CONSTITUTION:A master station inputs a reply from each slave station to a transmission reception section 4. Then a control section 6 compares a received IF signal with a threshold level and groups slave stations sending a signal in excess of the threshold level as a group A and slave stations sending a signal below the threshold level as a group B. While an antenna changeover switch 3 selects an A antenna 1, polling signals P3, P5 are sent sequentially to 3rd and 5th slave stations. That is, since the number of times of changeover of the antenna is decreased, the total time required for the antenna changeover is decreased.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention performs boring from a master station to a plurality of slave stations sequentially in a time-division manner, and through the boring, responds from each of the slave stations in a time-division manner. The present invention relates to a wireless communication method for performing communication over the internet.

[Prior Art] As a conventional wireless communication system of this type, the system shown in FIG. 4 is known. In this case, the master station first selects antenna A, and in the received level measurement cycle, for example, performs boring operations on five slave stations sequentially in a time-sharing manner Pi, P2, . P3. P4. P
5, each slave station sequentially responds R1, R1,
Return R2, R3°R4, R5 to the master station.

The master station measures the level of received waves from responses from each slave station and determines which antenna A or B should be used for data communication with each slave station.

In this communication system, the master station performs boring with each slave station in a data communication cycle while sequentially selecting and switching a suitable antenna without changing the bowling order.

For example, antenna A is used for communication with the first, second, and fourth slave stations.
is suitable, and antenna B is suitable for communication with the third and fifth slave stations.
When it is determined that antenna A is suitable, as shown in the figure, first the first and second slave stations perform bowling and response communications with antenna A, then switch to antenna B and perform bowling with the third slave station. , performs response communications, then switches to antenna A and performs boring and response communications with the fourth slave station, then switches to antenna B and performs bowling and response communications with the fifth slave station, and then switches to antenna B and performs bowling and response communications with the fifth slave station. Repeat 1. Therefore, communication between the master station and each slave station becomes ε.

[Problem to be solved by the invention] However, if communication is performed by only switching antennas without changing the bowling order, the antennas will have to be switched frequently, and an extreme fundamental tone may require communication with one slave station. Antenna switching is required for the communication device, which increases the total antenna switching time.Also, when switching antennas, a certain stabilization time is required, so the total stabilization time becomes longer, and the overall 1. There was a problem that communication efficiency decreased.

Therefore, the present invention aims to reduce the number of antenna switching points as much as possible.
The purpose is to provide a wireless communication method that can improve communication efficiency.

[Means and effects for solving the problem] The present invention performs boring from a master station to a plurality of slave stations one by one in a time-sharing manner, and by the boring, each slave station responds in a time-sharing manner. In a wireless communication system, the master station first selects one antenna from multiple antennas in the reception level measurement cycle and performs boring on each slave station, and when there is a response from each slave station, the master station The receiving branch level of the response is measured, and based on this measurement result, the antenna suitable for each station (m) is determined. Based on this determination result, each slave station is divided into groups that use the same antenna. Next, switch to the data communication cycle and perform boring for each slave station in groups, and when performing boring for each group, selectively switch the antenna to the corresponding antenna.In other words, the slave stations using the same antenna When a certain antenna is selected as one group, the master station performs boring for all the slave stations using that antenna, receives a response from each, and then switches to the next antenna. Control is repeated in which boring is performed on all slave stations using the switched antenna and responses are received from each slave station.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the master station connects two antennas, A antenna 1 and B antenna 2, which are installed at spatially separate positions, to the input/output terminals of the transmitter/receiver section 4 via the antenna changeover switch 3. are doing.

In the reception level measurement cycle, the transmitter/receiver 4 transmits the boring to each slave station sequentially in a time-division manner, receives a response from each slave station, and supplies the received IF signal obtained to the determiner 5.
7. It also supplies a timing signal to the control section 6.

The determiner 5 compares the level of the received IF signal with a preset threshold value 12 to determine the level, and supplies the result to the control unit 6.

For example, when the level exceeds a threshold, the control unit 6 classifies the slave stations as group A, and when the level exceeds the threshold (7), classifies the slave stations as group 8, group C. In the reception level measurement cycle, the antenna selector switch 3 is switched to select the A antenna 1, and in the data communication cycle, when communicating with the slave stations of the A group, the antenna selector switch 3 is switched to select the A antenna 1. When performing ≦゛, the antenna selector switch 3 is switched to select the B antenna 2.

The timing for switching the lever antenna is synchronized with the timing signal from the transmitting/receiving section 4.

As shown in FIG. 2, the slave station is composed of a transmitting/receiving section 1 and an antenna 12 connected to the Hitada terminal of the transmitting/receiving section 11. When receiving the bowling from the master station, it returns a response. For example, five slave stations are installed.

Next, the operation of this embodiment will be explained based on FIG. 3.

First, the master station selects the A antenna 1 with the antenna changeover switch 3 and performs a reception level measurement cycle, performing boring PI, P2, . P3. P
4. Send P5. As a result, each slave station returns responses R1°R2, R3, R4, and R5 to the master station.

The master station manually inputs the responses from each slave station to the transmitting/receiving section 4 and sends them to the receiving IF.
The signal is supplied to the control section 6. Then, in the control section 6, the reception I
The F signal level is compared with a threshold value, and the slave stations that have transmitted a signal exceeding the threshold value are grouped as A group, and the slave stations that have transmitted a signal that is below the threshold value are grouped as B group. For example, the third and fifth slave stations are group A, the first and second
, it is assumed that the fourth slave station is in group B.

In this way, when the master station completes communication with each slave station, it switches from the reception level A11 constant cycle to the data communication cycle and starts data communication.

In this cycle, first, with the antenna selector switch 3 selecting the A antenna 1, the third and fifth slave stations are bowled P3. P5 is transmitted sequentially, and responses R3 and R5 are sequentially received from each slave station.

When this is completed, the control unit 6 controls the antenna changeover switch 3 to select the B antenna 2. and the first
Bowling Pi for the slave station, the second slave station, and the fourth slave station,
P2. P4 is transmitted sequentially, and responses R1 and R are sent from each slave station.
2 and R4 are received sequentially.

When this is completed, the control unit 6 controls the antenna changeover switch 3 to select the A antenna 1. Then bowling P3 again to the third and fifth slave stations. P5 is transmitted sequentially, and responses R3 and R5 are sequentially received from each slave station.

When this is completed, the control unit 6 controls the antenna changeover switch 3 to select the B antenna 2. Then bowling P again to the 1st slave station, 2nd slave station, and 4th slave station.
i, P2. Sequentially transmit P4 and receive a response R1 from each of the 1,000 slave stations.
, R2, and R4 are received sequentially.

Thereafter, repeating this process, the master station performs data communication with each slave station.

In this way, the master station only needs to switch antennas once in the middle of communicating with five slave stations. In other words, the number of antenna switching times can be reduced, and therefore, from a total perspective, the time required for antenna switching can be shortened, and the stabilization time required after switching can also be shortened, so that overall communication efficiency can be improved.

Note that in the above embodiment, only antenna A 1 is selected in the reception level measurement cycle to communicate with each slave station to determine the reception level and determine the appropriate antenna, but the present invention is not necessarily limited to this. Furthermore, antenna B 2 may also be selected to communicate with each slave station, and a suitable antenna may be determined based on the reception level determination results of both antennas.

[Effects of the Invention] As detailed above, according to the present invention, when a master station communicates with a plurality of slave stations while selecting a suitable antenna from a plurality of antennas, it is possible to reduce the number of antenna switching as much as possible. Therefore, it is possible to provide a wireless communication method that can improve communication efficiency.

[Brief explanation of drawings]

1 to 3 show embodiments of the present invention.
Figure 2 is a block diagram of the master station, Figure 2 is a block diagram of the slave station, Figure 3 is a diagram showing the communication timing between the master station and each slave station, and Figure 4 is a diagram showing the communication timing between the master station and each slave station.
The figure is a diagram showing the communication timing between a master station and each slave station in the related art. 1.2... Antenna, 3... Antenna changeover switch, 4... Transmission/reception section, 5... Determiner, 6... i'Lrl all section.

Claims (1)

[Claims] In a wireless communication system in which a master station performs boring on multiple slave stations sequentially in a time-division manner, and communications are performed by sending responses from each of the slave stations sequentially in a time-division manner as a result of the boring, the master station first determines the reception level. In the measurement cycle, one antenna is selected from a plurality of antennas and boring is performed on each of the slave stations, and when a response is received from each slave station, the received wave level of the response is measured, and the measurement result is Based on this, the antenna suitable for communication to each slave station is determined, and based on the determination result, each slave station is divided into groups that use the same antenna, and then the data communication cycle is switched to perform boring for each slave station. A wireless communication system characterized by performing bowling for each group and selectively switching the antenna to a corresponding antenna when bowling for each group.