JPH04185025A - Radio call system - Google Patents

Abstract

PURPOSE:To make a pager terminal unoperated to reduce the battery consumption by setting a transmission signal format other than that for call signal transmission by a code converting means at the time of transmitting only a test paging signal from a radio base station. CONSTITUTION:At the time transmission of a call signal or this signal and a paging signal from a radio base station 13 to plural pager terminals 141 to 14n, such signal format is set that terminals 141 to 14n can secure the synchronism. This fact means that terminals 141 to 14n cannot secure the synchronism when the signal is transmitted from the base station 13 in a signal format other than that for call signal transmission. Consequently, the transmission signal format for transmission of only the test paging signal which is different from that for transmission of the call signal is set to make terminals 141 to 14n unoperated when only the test paging signal is transmitted from the base station 13 in this method.

Description

[Detailed Description of the Invention] [Summary] Reducing the power consumption of a pager terminal regarding a wireless paging system having a test pager that receives a test paging signal and monitors whether each wireless base station is transmitting normally. For the purpose of this, a wireless base station connected to a central control station transmits a paging signal to any pager terminal among a plurality of pager terminals, and periodically transmits a test paging signal.
In a radio paging method in which the test pager receives the test paging signal and the central control station confirms whether transmission from the radio base station is normal, a signal when only the test paging signal is transmitted from the radio base station. code changing means for making the first mat different from a signal format that can ensure synchronization of the plurality of pager terminals when the radio base station transmits a signal including at least the paging signal; Configure to have.

[Industrial application field]

The present invention relates to a wireless paging system, and more particularly to a wireless paging system having a test pager that receives a test paging signal and monitors whether each wireless base station is transmitting normally.

[Conventional technology]

- Or a wireless paging system (so-called paging system) consisting of wireless base stations on two sides and a plurality of pager terminals that receive paging signals transmitted from each wireless base station, which receives a test paging signal. 2. Description of the Related Art Conventionally, a wireless paging system is known in which a wireless base station is equipped with a test pager for monitoring whether each wireless base station is transmitting normally.

In this wireless calling system, for example, as shown in FIG.
P OCS A G (British Po5t 0
fficeCode 5 standard dizatjo
n Advisory Group) paging signals in a signal format based on the signaling system are transmitted and received. In the figure, the first 576 bits are preamble (PRE).
A fixed pattern signal 1 called AMBLE is placed, an SC signal (synchronization signal) 2 is placed in the following 32 bits, and data 3 is placed in the subsequent 512 bits.

Data 3 is divided into eight frames of 64 bits each, one of which is assigned to one pager terminal. Note that 544 bits consisting of SC signal 2 and data 3 is called 1 batch. Preamble 1 is transmitted only once during one transmission, but the number of batches is variable in length depending on the data content.

A signal in the above signal format transmitted from a wireless base station is received by a pager terminal. The pager terminal first establishes synchronization with the preamble, and then secures synchronization with the next SC signal 2.

Conventionally, the above signal format is the same during test browsing and when sending a paging signal. In addition, during test paging, as shown in FIG. 10(A), for example, a 64-bit test paging signal 4 is placed next to the SC signal 2 as shown by TEST, and the remaining 448-bit data area is used to indicate the signal to be transmitted. In the same figure (
A test paging signal 4 is placed in the data area as shown in B).
There are cases where only one is placed. The former is a case where there is a call to another pager terminal during test browsing, and the latter is a case where there is no call to another pager terminal during test browsing. Test paging is carried out periodically, and normally the test paging signal 4 and other calling signals 5 are mixed, as shown in Figure 1θ (A), but when the occurrence rate of paging signals is low, such as at night, the same figure (B ), only the test paging signal 4 may be transmitted.

[Problem to be solved by the invention]

As described above, each of the plurality of pager terminals is configured to receive a transmission signal from a wireless base station, establish synchronization with preamble 1 in the received signal, and ensure synchronization with SC signal 2. , this is done regardless of whether the test paging signal 4 is included in the transmitted signal or not.

Furthermore, the pager terminal is configured such that when synchronization is ensured, the receiving section consumes power supplied by the battery, but when asynchronous, the receiving section consumes almost no power.

On the other hand, the test paging signal is a signal dedicated to the test pager provided near the antenna of the wireless base station, and is a signal unrelated to the plurality of pager terminals. However, in the conventional system, the pager terminal does not ensure synchronization (even if only the test paging signal 4 shown in Fig. 10 (B) is transmitted from the wireless base station, the pager terminal ensures synchronization and receives was consuming unnecessary electricity.

The present invention has been made in view of the above points, and an object of the present invention is to provide a wireless calling system that can reduce power consumption of a pager terminal.

[Means to solve the problem]

FIG. 1 shows a basic configuration diagram of the system of the present invention. In the figure, a plurality of pager terminals 141 to 14. The central control station transmits a paging signal to any pager terminal among the pager terminals, periodically transmits a test paging signal, receives the test paging signal by the test pager 15, and checks whether the transmission from the wireless base station 13 is normal. 12, the present invention provides code changing means 16 in the central control station 12.
It is characterized in that the signal format when transmitting only a test paging signal is different from the signal format when transmitting at least a signal including a paging signal.

[Effect]

A plurality of pager terminals 141 to 14 from the wireless base station 13
．． The signal format when a paging signal or a paging signal is sent to the pager terminal 1
4+~14. are set to signal formats that can ensure synchronization. This means that when a signal is transmitted from the radio base station 13 in a signal format different from that used when transmitting a paging signal, pager terminals 14+ to 14. means that synchronization cannot be ensured.

Therefore, in the present invention, when transmitting only a test paging signal from the radio base station 13, the code changing means 16 sets the signal format of the transmitted signal at that time to a different signal format from that when transmitting the paging signal, so that the test paging signal can be transmitted from the wireless base station 13. When only paging signals are transmitted from the wireless base station 13, the pager terminals 141-14. This means that synchronization cannot be ensured.

〔Example〕

FIG. 2 shows a system configuration diagram of an embodiment of the method of the present invention. In the figure, the same components as in FIG. 1 are given the same reference numerals. In FIG. 2, IO is a telephone, 11 is a switchboard,
14 is a pager terminal 14° to 14. Indicates any pager terminal among the following. The test paging signal periodically transmitted from the wireless base station 13 is sent to the antenna of the wireless base station 13.
The received signal is received by a test pager 15 placed near the radio base station 130, and the received signal is sent from the test pager 15 to the central control station 12, where it is monitored by the radio base station 13 to see if correct signal transmission is being performed.

Further, when a call is made from the telephone IO to the pager terminal 14, the central control station 12 is activated through the exchange 11, and an announcement that a call is in progress is played to the telephone (caller) 10. In addition, by starting the central control station 12,
A paging signal generated by the central control station 12 is transmitted through the radio base station 13 in a frame assigned to the pager terminal 14.

The pager terminal 14 has a configuration as shown in FIG. 3, for example. In the figure, a receiving section 141
The paging signal received is decoded by a decoder 142 and then input to a microprocessor (MPU) 143. When the microprocessor 143 receives a call signal addressed to itself, the microprocessor 143 displays a liquid crystal display (LCD) 144.
Display calls and messages on the beaver 145
to notify the terminal user of the call. In addition,
The key 146 can be used to change the display on the LCD 144 or stop the beaver 145 from producing sound.

The power supply voltage of the pager terminal 14 having such a configuration is obtained from the battery 147 for reasons such as portability.
47 supplies power to the decoder 142 and MPU 143, and power is also supplied to the receiving section 141 via the decoder 142 when the receiving section is in operation.

Here, when the receiving section 141 of the pager terminal 14 is not receiving the signal or is not synchronized with the signal, the receiving section 141 of the pager terminal 14 shown in FIG.
B), one batch period of about 1 second (the SC signal 2
and data 3), the reception operation (RXON) is performed intermittently to receive the preamble and monitor to ensure synchronization with the signal. When the preamble is received as shown in FIG. 4 (A), the subsequent time t! synchronization can be established with

Further, after synchronization is established, if the pager terminal 14 receives a transmission signal in the signal format shown in FIG. 5(A),
The pager terminal 14 receives the SC signal 2 as shown in FIG.
From the decoder 142 to the receiving unit 14 so that the receiving unit 141 performs the receiving operation in synchronization with the assigned frame 6 and its own allocated frame 6.
1 (when synchronization is secured).

The 64 bits of transmission data of the assigned frame 6 are configured such that, for example, the same pattern of 32 bits is sent twice. Also, among these 32 bits, when the first 1 bit is "0", the next 18 bits indicate the address (the next 2 bits are the function bits), and when the first 1 bit is "1", the next 20 bits indicate the address. The format is such that it indicates message data, followed by 10 bits as an error correction code (BCH), and the last bit or parity bit. Note that the above function bits are used to determine the sounding form of the ring tone.

Here, even if only a test paging signal is transmitted from the wireless base station 13 during test paging, the above preamble 1 and SC signal 2 are normally transmitted in the conventional system, as shown in FIG. Since the calling signal is transmitted in the same format as when transmitting the calling signal, the receiving section 141 uses the same format as when transmitting the calling signal.
B) is supplied with power during the RXON period, resulting in unnecessary power consumption.

Meanwhile, in the first embodiment of the system of the present invention, the transmission signal format when transmitting only the test paging signal from the wireless base station 13 is as shown in FIG. The pattern is assumed to be a preamble 41 of a pattern other than the POC8AG signal system. That is, the code changing means 16 in the central control station 12 determines whether the two conditions of transmitting a test paging signal and not transmitting a paging signal are satisfied, and when it determines that both are satisfied. is a value indicating preamble 41, and the above 2
If it is determined that any of the following conditions is not satisfied, the preamble is set to the value specified in the POC8AG signal system shown at 1 in FIG. 9.

Then, the central control station 12 generates a signal by adding an SC signal, etc. to the preamble with the set value as described above, and transmits it through the radio base station 13. When the preamble 41 is received, the pattern is different from that at the time of receiving the calling signal, so it does not become synchronized and remains in the asynchronous state shown in FIG. 4(B).

Therefore, in this embodiment, the pager terminal 14 is in an asynchronous state when receiving the transmission signal consisting only of the test paging signal, and the operating time of the receiving section is reduced compared to that when receiving the paging signal shown in FIG. 5(B). , receiving section 141
The power consumption of the battery 147 can be reduced compared to the conventional case.

Next, in the second embodiment of the present invention, the preamble pattern in the transmission signal of the radio base station 13 when transmitting only a test paging signal is changed to a normal paging signal, as shown at 51 in FIG. Or a predetermined preamble (9th
Make it different from the pattern 1) in the figure. The only difference between this embodiment and the first embodiment is the pattern of the 576-bit preamble, and similarly to the first embodiment, the pager terminal 14 when receiving a transmission signal consisting only of a test paging signal. Power consumption of the battery 147 can be reduced compared to the conventional case.

Furthermore, FIG. 8 shows the format of a transmission signal consisting only of a test paging signal in a third embodiment of the system of the present invention. In this embodiment, the preamble 61 is not set to the preamble bit number 576 bits specified by the POCSAG system, but is set to a value other than that, for example 256 bits, by the central control station 12.
This is set to bit.

In the case of this embodiment as well, the pager terminal 14 is not in a synchronized state when receiving a transmission signal consisting only of a test paging signal, and as a result, the operation time of the receiving section 141 is reduced or Since the operation time is shorter than that when synchronization is secured, power consumption of the battery 147 can be reduced.

〔Effect of the invention〕

As described above, according to the present invention, when only a test paging signal is transmitted from a wireless base station, the pager terminal cannot ensure synchronization, so the battery power of the pager terminal when receiving a transmission signal consisting only of a test paging signal is reduced. This battery has the advantage of being able to reduce consumption compared to conventional batteries and having a longer battery life than conventional batteries.

[Brief explanation of drawings]

Figure 1 is a diagram of the principle of the present invention; Figure 2 is a system diagram of an embodiment of the present invention; Figure 3 is a diagram of an example of a pager terminal; Figure 4 is an explanation of the operation of the pager terminal during asynchronous operation. 5 is an explanatory diagram of the operation of the pager terminal during synchronization, FIGS. 6 to 8 are diagrams showing the format of the transmission signal in each embodiment of the present invention, and FIG. 9 is the signal format according to the POC3AG signal system. FIG. 1 is a diagram showing the format of a transmission signal in the conventional system. In the figure, 12 is a central control station, 13 is a wireless base station, and 141 to 14. ．． 14 is a pager terminal, 15 is a test pager, and 16 is a code changing means.

Claims (1)

[Claims] Among the plural pager terminals (14_1 to 14_n) from the radio base station (13) connected to the central control station (12),
In addition to sending a calling signal to any pager terminal,
A radio call in which the central control station (12) periodically transmits a test paging signal, receives the test paging signal by a test pager (15), and confirms whether transmission from the radio base station (13) is normal. In the method, the signal format when transmitting only the test paging signal from the wireless base station (13) is set according to the wireless base station (13).
code changing means (13) for changing the signal format from a signal format that can ensure synchronization of the plurality of pager terminals when transmitting a signal including at least the paging signal;
6) in the central control station (12).