JPH04349724A - Selective calling receiver - Google Patents

Abstract

PURPOSE:To realize the selective calling receiver whose battery service life is long without being affected by a selective calling number by switching a quantity discrimination criterion of a comparison means based on an output of a detection means detecting the sequence of address transmission automatically. CONSTITUTION:The communication signal consists of a 576-bit preamble signal, a synchronizing signal and 8 frame signals, and one batch is referred to as a period from the synchronizing signal till the frame signal (32+512 bits) and the address signal is sent in the ascending order corresponding to each frame. Power is supplied to a radio section for the reception of the synchronizing signal and the address signal till the address signal reaches an individual calling number or over (1-4 batches). When the address signal reaches the individual calling number or over (5th batch and after), the power supply to the radio section for the reception of the synchronizing signal and the address signal so far is switched into the power supply to the radio section for receiving the preamble signal. Thus, the operating time of the radio section is reduced and the efficiency of battery saving is improved.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a selective call receiver, and more particularly to a battery saving (intermittent reception) system.

0002

[Prior Art] A conventional selective calling receiver is
160830, the generic name POCSA
The G-code method is popular. When the receiver side detects the preamble signal, it intermittently supplies power to the radio section in order to detect the sync signal and address signal. Additionally, if the address signal matches the individual calling number, a continuing message signal is received and stored in memory. and,
If the sync signal cannot be detected approximately twice, the radio section stops detecting the sync signal and address signal, and the radio section is intermittently supplied with power for preamble signal detection.

Therefore, for example, if addresses are transmitted (including messages) after a preamble signal in the order of the address numbers, and an address number exceeding the individual calling number of the receiver is received, the power supply to the radio unit is switched to the address number. It is conceivable to extend the battery life by switching from the operation of receiving the preamble signal to the operation of receiving the preamble signal.

0004

[Problem to be Solved by the Invention] In the above technology, since address transmission is performed in the order of address numbers, if the order of address transmission is from small to large, the selective calling receiver with the smaller individual calling number requires less power to the radio unit. supply is low,
Battery life will vary between selective call receivers.

Therefore, in the present invention, the order of address transmission (address numbers) (large → small or small → large) is changed at a certain period on the transmitter side, and the selective call receiver side automatically detects the order of address transmission. If an address number exceeding the individual calling number of the receiver is received, the power supply to the radio unit is switched from the operation of receiving the address number to the operation of receiving the preamble signal, so that the selective calling number is received. The object of the present invention is to provide a selective call receiver with a long battery life that is not affected by battery life.

[0006]

[Means for Solving the Problems] In order to solve the above problems, in the receiver of the present invention, the order of address transmission (
It has a detection means that automatically detects (large → small or small → large), and the size judgment criterion of the comparison means is switched based on this output. That is, after receiving the preamble signal, a comparison means is provided to determine whether the received address number and the individual calling number match and are in a magnitude relationship. The determination of the magnitude relationship by this comparison means is not fixed, but the determination criterion is switched based on the output of the detection means. When the comparison means receives an address signal exceeding the individual calling number, it has means for switching the power supply to the wireless unit from the operation of receiving the address signal to the operation of receiving the preamble signal.

[0007]

[Operation] In such a selective calling receiver, the size determination criterion of the comparison means is switched based on the output of the detection means that automatically detects the order of address transmission (large→small or small→large). In other words, the order of address transmission is
In the case of small → large, if the received address number is larger than the individual calling number, and if the order of address transmission is large → small, the received address number is determined to be smaller than the individual calling number. The power supply is shifted from the operation of receiving the address signal to the operation of receiving the preamble signal.

[0008]

[Examples] The details of the present invention will be explained below with reference to Examples. FIG. 1 is a block diagram of a selective call receiver according to the present invention. A desired radio frequency is demodulated by a radio section 2 including a discriminator via a built-in antenna 1, and converted into a rectangular wave by a waveform shaping circuit 3. Wireless section 2 and waveform shaping circuit 3
A power supply control circuit 4 that supplies power to is controlled by a control section 5. The power supply control circuit 4 includes first power supply means for supplying power to the wireless section 2 in order to receive the preamble signal;
It has second power supply means for supplying power to the wireless section 2 in order to receive the sync signal and address signal. The control unit 5 performs bit synchronization with the received signal, frame synchronization, and radio unit 2.
Battery saving measures to reduce power consumption, such as
Then, the address signal from the radio section 2 is compared with data from the P-ROM 6 (individual calling number storage means) in which the individual calling number of the receiver is written, with error control. Then, it determines whether or not it has been called, and if it has not been called, it controls a comparison means that compares the call number with the individual call number. Also, after detecting the preamble signal, 2
The detected address number is stored in the memory 9 until the address signal is detected. Then, when you memorize twice, the first memorized number and the second memorized number are compared and the order of address transmission (large → small or small →
Large) Send the results to the comparison means.

[0009] When the call is confirmed, the subsequent message data is stored in the memory 9 (storage means). Further, an alarm device 8 such as a buzzer, LED, or vibrator via the alarm drive circuit 7 notifies the user of the call. The stored message is sent to the LCD drive circuit 10 via the control section 5 by an external operation member 13 consisting of switches, and is sent to the LCD drive circuit 10 on the LCD display 12.
Displayed by The power switch 13a, which is a part of the external operation member, basically turns off the power switch 13a when the user does not want to receive a message, thereby extending the battery life. A clock signal is sent to the control section 5 and the LCD drive circuit 10 from a crystal oscillation circuit 11. The message processing unit 14, which includes a power supply control circuit 4, a control unit 5, a memory 9, an LCD drive circuit 10, and an oscillation circuit 11, is composed of a one-chip microcomputer. A battery 15 supplies power to the selective call receiver.

FIG. 2 is a flowchart of the receiving operation according to the present invention. The example is P with a transmission speed of 512 bps.
OCSAG format, 576-bit preamble signal (:PRE), sync signal (:SC) and 8
Each batch consists of frame signals (0F to 7F), and one batch refers to the period from the sync signal to the frame signal (32+512 bits). Further, it is assumed that address transmission (message transmission) is performed in order from the smallest address number to the next corresponding to each frame. It is assumed that one frame consists of two words, and address transmission is performed in the first word (first). The individual call number is “1200” (frame:
0F). Also, the address signal (number) of the 0 frame of the 1st batch is "480", the address signal of the 0 frame of the 2nd batch is "800", the address signal of the 0 frame of the 3rd batch is "1200", and the address signal of the 0 frame of the 4th batch is "800". It is assumed that the address signal is "1600", the address signal of the 0 frame of the 5th batch is "2000", and the same applies to the 6th and subsequent batches. Further, transmission of frames other than frame 0 will be omitted to omit explanation.

[0011] The receiver is "powered on" by the power switch.
(20) Then, the process advances to "Preamble signal?" (21), where power is supplied to the wireless unit for a short time (about 20 bits) and it is determined whether the received signal is a preamble signal. If no preamble signal is detected, the process proceeds to "1 second timer set" (22), which sets a 1 second timer. Then, the process advances to "1 second elapsed?" (23), which determines whether the set timer has elapsed for 1 second. If 1 second has not elapsed, the determination of whether 1 second has elapsed is repeated. When one second has elapsed, the process returns to "Preamble signal?" (21) to determine whether it is a preamble signal. That is, power is supplied to the radio section for a short period of one second, and preamble signal detection is performed. When a preamble signal is detected, the address memory flag is reset and the process proceeds to "Sync signal?" (24), which determines whether it is a sync signal. This “sync signal?” (24)
Power is supplied to the wireless section during this period as well. This process is repeated until a sync signal is detected. When a sync signal is detected, the process proceeds to ``sync timer set'' (25), in which a sync timer is set to determine the time to supply power to the wireless unit in accordance with the next sync signal. Next, the process proceeds to "address timer set" (26), which sets an address timer that determines the time to supply power to the wireless section in accordance with the address signal of the own frame. In the embodiment, since frame=0, the timer time is set to "zero". Then, the process advances to "Address timer elapsed?" (27), which determines whether the address timer has elapsed. In the embodiment, since the timer time is "zero", the address signal is immediately received. The address signal (number) of the first batch is "480", and when the address signal reception is completed, the address memory
Determine whether the flag is set "Memory flag =
0? "Proceed to (28). This memory flag is "Sync signal? "It is reset (=0) at (24), and set (=1) when two received addresses are memorized. In this scene, since the "memory flag = 0", the process proceeds in the direction of memorizing the address. Then, the address to be memorized is Determine if it is the first time "First address?" ” Proceed to (29). This is the first memory, so “address memory” (
Proceed to step 30) and store address "480" in memory. The process then proceeds to "Is the address the same?" (34) where it is determined whether this address signal and the individual call number are the same (called). Here, since the addresses are not the same, the power supply to the wireless section is stopped and the process goes to "Memory flag = 1?" (36). Since "memory flag = 0" here, the process advances to "Sync timer elapsed?" (40), which determines whether the previously set sync timer has elapsed. This process is repeated until the sync timer expires. When the sync timer elapses, power is supplied to the wireless unit again to detect the sync signal, and the sync signal is detected. "Sync signal?" (41)
Proceed to. If the sync signal cannot be detected, the process goes to "Preamble signal?" (21) again, and the preamble signal is detected. In this embodiment, the sync signal of the second batch is detected and the process proceeds to the second batch. In the first batch, power is continuously supplied to the wireless unit from sync signal detection (step: 24) to address check (step: 34).

The second batch is the same as the first batch up to the determination in step (29). This is the second address memory, so proceed to “Address Memory” (31).
Address "800" is stored in memory and the memory flag is set (=1). Then, the first address that was memorized and 2
"Address transmission order calculation" (calculating the order of address transmission (large → small or small → large) from the first address
32). In the example, the first address = 48
0, the second address = 800, so it is determined that the order of address transmission is from small to large. Then, the process proceeds to "Set large/small flag" (33) to set the result. The size flag is set to "0" when the change is from small to large, and to "1" when the change is from large to small. Then, the process similarly advances to step (36). This time, the answer is affirmative, and the process goes to "Is the size flag = 1?" (37), which checks the flag set in step (33). Since the magnitude flag is 0, the process advances to "Address<?" (38), which determines the magnitude relationship between the previously received address signal and the individual call number. In the example, address = 800, individual call number = 12
00, which is affirmed and the process goes to step (41) again, where the sync signal is detected and the process moves to the third batch.

The standard of the magnitude relationship in step (37) is determined based on the result calculated in step (32). In other words, if the address transmission order is from small to large, "address <
? ”(38), and if the address transmission order is from large to small, then “address>?” ” (39).

Processing of the third batch is denied in step (28), and the process proceeds to step (34). Since "1200" is transmitted as the address of the third batch, the address signal and the individual calling number are the same, and the process proceeds to "message storage" (35) where the message following the address signal is stored. Then, the process passes through steps (40) and (41) and moves on to the fourth batch process.

Processing for the fourth batch is the same as described above up to step (37), and since the address signal (1600) is larger than the individual call number (1200), it is denied and the process proceeds to step (21), where the preamble signal is is detected, and this process is repeated until the next preamble transmission.

That is, until the address signal becomes equal to or higher than the individual calling number (between batches 1, 2, 3, and 4), power is supplied to the radio section for receiving the sync signal and address signal. Then, the address signal is greater than or equal to the individual calling number (
5 batches or later), the power supply to the radio unit for receiving the sync signal and address signal is switched to the power supply to the radio unit for receiving the preamble signal. Therefore, the operating time of the wireless section is shortened and battery saving efficiency is improved.

FIG. 3 is a timing chart diagram of FIG. 2. The first power supply output corresponds to step (21) processing in FIG. The second power supply output corresponds to the combined processing from step (24) to step (34) or step (35) in FIG. In this embodiment, the address transmission order is determined based on the address number, but the invention is not limited to this. For example, a signal indicating the address transmission order may be transmitted after the first batch sync signal. The same is true.

[0018]

As described above, according to the present invention, even if the transmitter side changes the address transmission order (large → small or small → large) at a certain cycle, the selective calling receiver side does not transmit addresses. If an address number exceeding the individual calling number of the receiver is received, the power supply to the radio unit is switched from the operation of receiving the address number to the operation of receiving the preamble signal. By switching, it is possible to provide a selective call receiver that is not affected by the selective call number, reduces power supply to the radio unit due to calls other than the own, and has high battery saving efficiency.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a selective call receiver of the present invention.

FIG. 2 is a flowchart of reception processing according to the present invention.

FIG. 3 is a timing chart diagram of FIG. 2;

[Explanation of symbols]

2...Radio section 4...Power control 5...Control unit 6...P-ROM 9...Memory 10...LCD drive circuit 13...External operation member 14...Message processing section 15...Battery

Claims (1)

[Claims] 1. A radio unit that receives a preamble signal and an address signal; a first power supply means that supplies power to the radio unit intermittently at a predetermined period so as to detect the preamble signal; a second power supply means for intermittently supplying power to the radio unit at a predetermined period so as to detect the radio unit; an individual call number storage unit for storing the individual call number of the selective call receiver; a comparison unit that compares the address signal with the calling number from the individual calling number storage means and whether it is large or small; a size setting unit that sets the comparison unit to make a comparison based on an external signal; When the size comparison is determined, the power supply to the wireless section is switched from the second power supply means to the first power supply means.
1. A selective call receiver comprising a switching means for switching to a power supply means.