JPS5820173B2 - Radio message response signal transmission method - Google Patents

Description

[Detailed Description of the Invention] This invention transmits a message to the other party using a wireless system,
Regarding a series of wireless message/response methods in which the recipient's receiver immediately notifies (responses) the caller that it has received a message, it is particularly important to avoid collisions between message and incoming response signals and to use the wireless channel effectively. Relates to call response signal transmission method.

When traveling, for example, when it becomes necessary to convey instructions or requests to someone who is out, it is now possible to contact the other person by using a service called a pager (wireless paging).

In other words, if a person carries a pager and receives a call, he or she can make contact by agreeing to call a specific location.

However, this method requires the person receiving the call to place a call to a predetermined location.

When a person is called by a pager, it is usually not clear what kind of business the person is being called for, whether it is urgent or not.

Therefore, a new wireless message system has been proposed.

That is, a mobile terminal corresponding to a pager is configured to be able to display the caller's business information on a display, a printer, or the like.

Therefore, a person who is out at the time of receiving a call can know the caller's business.

Furthermore, from the sender's perspective, it is unsettling to know whether or not the message has been received by the other party, and this is an incomplete message system.

Therefore, immediately after receiving a call, the mobile terminal first emits some kind of signal indicating that the message has been received, that is, an incoming call response signal, and transmits this to the caller.

In such a system, assuming that a large number of people own mobile terminals, it is assumed that the message information sent from the caller and the incoming call response signal sent from the mobile device occur in large numbers randomly over time. It will be done.

Therefore, it is conceivable that the signals may collide with each other and the message or response may not be transmitted.

When designing such a wireless message system, it is important to minimize the probability of this collision.

Therefore, the present invention aims to reduce these collisions so that messages can be transmitted efficiently, obtain incoming call response signals, and effectively utilize the radio channel as a particularly important transmission path in wireless systems, that is, increase the efficiency of radio frequency usage. The purpose of the present invention is to provide a wireless message reception response signal transmission method.

According to the present invention, a message signal is transmitted from one transmitting station to a large number of transmitting and receiving stations using a plurality of downlink transmission paths, and in this case, at least one of the start time and end time of signal transmission is shifted by a fixed time interval. In this way, the responses of the transmitting and receiving stations do not collide, and moreover, it is possible to respond to incoming calls using fewer radio channels than the number of radio channels.

FIG. 1 shows a schematic diagram of the configuration of a wireless message response system configured according to the conventional concept.

For example, the outline of the operation from transmitting a message from the subscriber telephone number NA in the subscriber telephone set 1 to the mobile terminal number MA and receiving the incoming call response can be explained as follows.

When the exchange 2 receives the destination number MA issued from the subscriber telephone 1, the exchange 2 identifies that this number MA is addressed to a mobile device using the wireless message response system, and connects the subscriber telephone 1 with the downlink transmission path. The wireless channel selection exchange 3 that constitutes the wireless channel selection switch 3 is connected.

Therefore, the exchange 3 prompts the caller with the number NA to input a message, stores the sent messages, and at the center frequency f
One of the wireless transmitters 4 of T, ~fTn is selected and connected to transmit a signal through the transmitting antenna 5.

The mobile terminal with number MA among the mobile terminals 6 has a frequency fT.
The previous message was received at k (k is either 1, ... n), and the frequency fRk that is paired with this frequency fTk
to send an incoming call response signal.

The incoming call response signal is received by the receiver with the frequency fRk in the receiver 8 with the center frequencies fR1 to fRn through the receiving antenna 7, and is then transmitted from the exchange 3 to the exchange 2 to the caller with the number NA. Become.

It is generally sufficient for the incoming call response signal to be much shorter than the message length.

What is considered to be a problem is that radio channels fR+ to fRn are prepared for this short call response signal transmission.

That is, the same number of radio channels fR+ to fRn for answering incoming calls as the radio channels fT and fTn for transmitting messages is prepared, and in this case, the radio channels fR for answering incoming calls
The usage rate of I to fRn becomes very poor.

Therefore, this invention is a method of transmitting incoming call responses without confusion using fewer channels than channels for message transmission, in other words, a signal transmission method that makes effective use of the transmission path. Its implementation will be explained below.

In FIG. 2, there are three radio channels fTl, fT2° fT3, which are used as downlink transmission paths, that is, radio channels used as transmission paths from the transmitter 4 to the mobile device 6, that is, radio channels for message transmission.
Furthermore, the radio channel for incoming call response used in the uplink transmission path, that is, the transmission path from the mobile device 6 to the receiver 8, shows the temporal relationship between each radio channel and the transmission signal when one wave of fR is assumed.

On the radio channel fT+, messages are transmitted to the mobile stations MIA 2MIB I MIC, . . . belonging to the first frequency, and on the radio channel fT2, messages are transmitted to the mobile stations M2A2M2B2M2c, . A message is transmitted to the mobile stations M3A) M3B, M3C, belonging to the third frequency on the radio channel fT3.
A message is transmitted to...

Incoming response signals from all mobile stations are transmitted on the upstream channel of frequency fR.

When transmitting signals from a base station to mobile stations belonging to each of these three frequencies, the signals are transmitted sequentially with a predetermined time T1 shift for each frequency, as shown in FIG.

Here, the time T is T]=T2/3.

That is, in this invention, P downlink radio channels are provided for one uplink radio channel.

Therefore, if expressed in general terms, time T1 is T I = T
2/p.

Also, in each downlink radio channel, a fixed time interval T2
to transmit signals.

That is, a message from telephone subscriber N (caller Nl) to mobile station MIA is transmitted at frequency fT1, and from the start of transmission, 17
A message is sent from caller N2 to mobile station M2A on frequency fT2 after time, and frequency fT3 after time T1 from the start of transmission.
After the message is sent from the caller N3 to the mobile station M3A, and then after the message from the previous caller N to the mobile station MIA is completed and at least a time T1 has elapsed since the transmission to the mobile station M3A, the transmission is made at the frequency fT1. Message from mobile device N4 to mobile device M1B,・
. . . are transmitted in order.

In that case, the time points at which messages are sent are maintained at a constant interval T1 and a constant phase relationship over each frequency.

On the other hand, the mobile device, after a certain period of time T3 from the start of signal reception,
Emit an incoming call response signal.

If the length of each message is constant, an incoming call response signal may be issued immediately after the message is received.

The length of this incoming call response signal is made shorter than the message transmission interval T2.

In other words, the time length t of the incoming call response signal issued by one mobile device is 2, ≦-1° when there are three radio channels, r, / L/was6. Tht≦Determined by prefecture.

In this way, as shown in FIG. 2, the incoming call response signal can be transmitted without causing any collision.

It is also possible to determine the point in time when the incoming call response signal is returned.
It is also possible to decide which mobile device will respond to the incoming call.

Therefore, according to the invention, it is not necessarily a mobile device. There is no need to send your number.

In the above description, the message transmission time point is shifted by T1, but the message end time may be sequentially shifted by time T4 between each radio channel.

In this case, each mobile device receives the message immediately after receiving the message.

It is sufficient to generate an incoming call response signal shorter than T4.

Moreover, this can be done regardless of the length of the message.

If the message sending time is shifted by T1 and an incoming call response signal is sent immediately after message reception is completed, if the corresponding message is short and the message sent immediately before is long, there is a risk that the incoming call response signals will collide. Therefore, as described above, it is necessary to transmit the incoming call response signal after a certain period of time from the time the message is received.

As described above, it is possible to implement a message system in which the transmission of messages and incoming call responses is carried out efficiently without collision, and which also makes effective use of the radio channel.

If signals are transmitted by the method of the present invention described above, it is possible to realize a message system that uses radio frequencies effectively without any problems, that is, a message system that has high transmission efficiency and transmission reliability and effectively uses radio frequencies.

Although the explanation has been given regarding a message response method using a wireless transmission path, it goes without saying that the signal transmission method described here is not limited by the type of transmission path, and can be widely applied.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an overview of an example of a wireless message reception response signal transmission method, and FIG. 2 is a block diagram showing an example of a wireless message reception response signal transmission method according to the present invention, using channels, messages, and response signals. FIG. 1: Subscriber telephone, 2: Exchange, 3: Wireless channel selection exchange, 4: Transmitter, 6: Mobile device, 8: Receiver, fT
I to fT3: Radio channel for message transmission, fR: Radio channel for incoming call response transmission.

Claims (1)

[Claims] 1 In a system in which information is selectively transmitted from one transmitting/receiving station to a plurality of transmitting/receiving stations, and a designated station among the plurality of transmitting/receiving stations returns an incoming response to the one transmitting/receiving station, the one transmitting/receiving station The number of downlink transmission paths (P ≧ 2) from 1 to multiple transmitting/receiving stations is configured, and the uplink transmission path that transmits data in the opposite direction to this downlink transmission path is configured with respect to the number of downlink transmission paths P. 10 ratio, the transmission start end or end of the information to be transmitted on the downlink transmission path is shifted by a fixed time interval for each transmission path of the downlink transmission path, and the transmitted information is selectively received by the individual. The transmitting/receiving station transmits an incoming call response signal having a length shorter than 1/P of the signal length of the information to the one transmitting/receiving station through the uplink transmission path after a certain period of time has elapsed. Incoming call response signal transmission method.