JPH0693647B2 - Wireless selective calling method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a configuration of a selective call signal in wireless selective call, and more particularly to a wireless selective call method capable of transmitting not only a call but also transmission information. The present invention is suitable for use in the so-called "pager with display" system.

[Conventional technology]

The conventional radio selective calling method adopts an intermittent reception method, in which subscribers are divided into a plurality of groups, and each subscriber receiver receives the power by turning on the power supply only during the time slot of its own group.

The conventional signal configuration method is shown in FIG.

As shown in FIG. 2 (a), the paging signal transmitted from the base station connects n paging signals for each group having a signal length t ₀ ,
It is composed of a signal with a period of length T ₀ . The signal structure for each group is, as shown in FIG. 2B, a synchronization signal, m address signals which are identification signals of called subscribers belonging to the group, and each receiver corresponding to each address signal. And a transmission information signal of.

Here, in FIG. 2B, h ₁ , h ₂ , h ₃ and h ₄ respectively indicate the number of bits of the synchronization signal, the address signal, the transmission information signal and the information transmission section. Also, the signal speeds of the synchronization signal and the information transmission section are fb ₀ and fb ₁ .

As shown in FIG. 2 (c), the synchronization signal is a bit synchronization signal for achieving bit synchronization, a word synchronization signal for achieving word synchronization within a time slot, and a signal for which receiver group the time slot is. And a group synchronization signal indicating that. Each subscriber receiver operates so as to receive the group synchronization signal and receive only the time slot in which the signal of the group to which the own receiver belongs is sent, and does not receive other time slots.

The call signal for each group is composed of a synchronization signal, a plurality of address signals (address 1 to address m) for identifying the called subscriber in the group, and a portion of a transmission information signal corresponding to this address. , If the address signal and the address of the self-receiver match, each receiver judges that there is a call to the receiver, decodes the subsequent transmission information signal, and transmits the transmission information to the display unit together with the sound. Display the contents.

[Problems to be solved by the invention]

However, in this conventional configuration, since the transmission information is always sent after the addresses 1 to m, the information transmission section (h ₄ ) following the synchronization signal cannot be effectively used in practice.

That is, when a person calls the wireless paging receiver with a display, according to statistical data, it is used as a tone only that does not send out transmission information with a probability of about 50%. In this case, the bit effective utilization rate η of the information transmission section following the synchronization signal is Therefore, for example, if h ₃ = 3h ₂ , the effective utilization rate is about 62.5%. As described above, in the conventional method, the number of subscribers that can be accommodated is limited, and it is not possible to effectively use radio waves.

It is an object of the present invention to provide a radio selective calling method capable of effectively using the transmission signal and increasing the number of subscribers according to the usage form of the user and achieving effective use of radio waves.

[Means for solving problems]

According to the present invention, a ringing signal for calling a called receiver is divided into a plurality of groups, and a ringing signal for each group includes a synchronization signal common to each group and a plurality of address signals for identifying individual receivers and this address. In the radio selective calling system, which is composed of a transmission information signal corresponding to the signal, transmits this calling signal from the base station, and each receiver intermittently receives the calling signal belonging to its own group, the section following the synchronization signal. In place of the address signal, a specific signal having the same configuration as the address signal is arranged, and when this specific signal is arranged, a plurality of address signals are arranged in place of the transfer information signal in the next transfer information signal section. It is characterized by

[Action]

The base station constructs and sends a calling signal in which transmission information is added to the synchronizing signal and the address signal or the synchronizing signal and the address signal for each calling signal for each group.

In this case, when there is a specific signal at the position of the address signal, the transmission information is not added next and the address signal follows.
Therefore, in the case of tone-only calling, the receiver recognizes that its own receiver is called by the address signal following this specific signal, and calls only the ringing tone. When the transmission information is added to the address signal, the receiver called by the address signal to which the transmission information signal is added decodes the transmission information signal and displays the transmitted transmission information.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a signal configuration according to an embodiment of the present invention. FIG. 1 (a) shows an overall signal configuration, FIG. 1 (b) shows a group 1 signal configuration, and FIG. FIG. 7C shows the structure of the synchronization signal.

The ringing signal transmitted from the base station is similar to the conventional one in that the ringing signal for each group is composed of signals of a period T ₀ , which is obtained by connecting n ringing signals for each group of time t _0. The synchronizing signal at the head position of is also the same as the conventional one, and the signal speed of the synchronizing signal is also the same.

A feature of the present invention is the configuration of the selective call signal corresponding to the called subscriber receiver. That is, when there is no transmission information for the called subscriber, a call is made with a specific signal having the same configuration as the address signal indicating that the address signal is arranged in the section allocated to the transmission information that follows the address signal portion. This is done by arranging and then arranging address signals for calling individual receivers.

The signal configuration will be specifically shown below. Here, an example in which only the address signal is transmitted for the first to kth [address signal + transmission information signal] is shown. The address signals 1 ₁ to 2 ₁ , ..., K ₁ are the address signal portion in the conventional example, and in this address signal portion, a specific signal having the same configuration as the address signal, that is, the subsequent data is not the transmission information signal but the address signal It contains a specific address signal indicating that there is.

The number k is determined by the base station depending on the ratio of the call contents to be transmitted at any given time without the transmission information signal.

In region (q positive integers) k ₂ ~kq the address signals 1 ₂ ~1q is for transmitting the transfer information if conventional, an address signal k
-(Q-1) pieces are transmitted. Where h ₃ = h ₂
The relationship of (q-1) is established. Otherwise, the number of bits of h ₃ −h ₂ · (q−1) is set as the remaining bits, and they are arranged at the end of h ₃ . That is, it is necessary to determine that the number of address signals is (q-1) and is equal to the length h _{3 of} one piece of transmission information.

The transmission efficiency of this embodiment will be examined.

If the transmission capacity of the conventional method is C and the transmission capacity of this method is C ′, Becomes

Here, if k + 1 and q-2 are used as parameters and k is used as a variable, the relationship between C '/ C and k can be illustrated as shown in the graph of FIG. For example, k + l = 4, q = 4
Then, if k = 1, then C '/ C = 1.5, resulting in a 50% increase in subscriber capacity. At this time, the number of addresses accommodated in one group is 3 for address signals and 3 for [address signals + transfer information signals]. If the probability that a person calling the wireless paging receiver with a display will be tone-only will be 50%, the capacity of the number of subscribers can be increased by 50% by using this method.

The receiver not only reads the address signal and, in the case of its own address signal, decodes the transmission information signal that follows it, but the address signal is not its own address signal, but a specific address signal having the same configuration as the address signal. When (the specific address signal is made to match on the base station side and the receiver side), it is judged that only the address signal is accommodated in the transmission information signal section that should follow after that, and further If there is no own address signal, it is determined that the tone-only call is made when the own address signal is present, and the call operation such as ringing is started.

〔The invention's effect〕

As described above, even if the present invention is the wireless paging system with display, when the message content to the called receiver is the tone paging only the address, the address sent to the signal from the base station is addressed. Since only the signal is transmitted,
The signal transmission capacity can be increased, the number of subscribers can be increased, and effective use of radio waves can be achieved.

[Brief description of drawings]

 FIG. 1 is a signal configuration diagram of an embodiment of the present invention. FIG. 2 is a conventional signal configuration diagram. FIG. 3 is a diagram showing a subscriber accommodation ratio between the embodiment and the conventional example.

Claims (1)

[Claims] 1. A calling signal for calling a called receiver is divided into a plurality of groups, and the calling signal for each group includes a synchronizing signal common to each group and a plurality of address signals for identifying individual receivers. In the radio selective calling system, which is composed of a transfer information signal corresponding to the address signal, transmits this calling signal from the base station, and each receiver intermittently receives the calling signal belonging to its own group, following the above synchronization signal. A specific signal having the same configuration as the address signal is arranged in the section in place of the address signal, and when this specific signal is arranged, a plurality of address signals are arranged in place of the transfer information signal in the subsequent transmission information signal section. A radio selective calling method characterized by being performed.