JPH0595311A - Battery saving system - Google Patents

Abstract

PURPOSE:To minimize a power supply ON period in a battery saving period of a slave station as required in the system adopting multi-frame structure. CONSTITUTION:A master station 1 generates a specific number signal Sb representing a specific number of each slave station by using a specific number generating circuit 11 and a multiplexer circuit 12 is used to send the signal while being superimposed on a BS time slot of each frame to a slave station 2. A specific number synchronization circuit 25 generates a synchronizing signal Ss in subordinate synchronization with a BS period of the master station. A control circuit 27 calculates a timing based on a specific number of its own station stored by a storage circuit 26 and on the synchronizing signal Ss and generates a control signal Sc for applying on/off control of a power supply system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery saving system, and more particularly to a system in which one master station and a plurality of slave stations communicate with each other using time division multiplexed signals having a multi-frame structure. It relates to a battery saving method that saves power consumption by performing on / off control of the power supply system.

[0002]

2. Description of the Related Art Conventionally, in a battery saving method in a system that does not adopt a multi-frame structure, a specific battery saving time slot (hereinafter referred to as a BS time slot) is provided in each frame, and the master station is
A power-off signal for the slave station is transmitted and controlled in n (n is an integer of 2 or more) BS time slots within the battery saving cycle (cycle of n frames). When the slave station receives the power-off signal from the master station included in the BS time slot of the frame addressed to itself among the n BS time slots, the slave station turns off the power supply system of each unit capable of battery saving, and at the same time. After setting the counter of its own station to a predetermined value and counting a predetermined power-off time, the power is turned on.

Further, in a battery saving system in a system having a multi-frame structure composed of m (m is an integer of 2 or more) frames, the slave station receives an incoming signal in any of the m frames. The power is on for at least one multi-frame period because it is not known.

[0004]

In the above-mentioned conventional BS system, the slave station periodically turns on / off the power even when there is no incoming signal from the parent station, so the power on / off time is fixed. To be the target.

Further, in a system having a multi-frame structure consisting of m frames, it is necessary to turn on the power supply for at least one multi-frame period (m frame periods). Here, the average power consumption of the slave station is determined by the on / off ratio of the power source, but in the conventional case, the power system is turned on for a certain period of time even if there is no incoming signal, so wasted power is consumed. It will be. In particular, in the case of a system in which signals that have a multi-frame configuration and signals that do not have a multi-frame configuration coexist, in a slave station that handles signals that do not have a multi-frame configuration, the power is originally turned on for at least one frame period, However, it is necessary to fixedly turn on the power supply for one multi-frame period, which causes a problem of extremely low efficiency.

An object of the present invention is to provide a battery saving method capable of shortening a power-on period to a necessary minimum in a system having a multi-frame structure.

[0007]

According to the battery saving method of the present invention, one master station has n multi-frames (n is an integer of 2 or more), each consisting of m frames each having a specific time slot. A battery saving method for controlling on / off of a power supply system of a plurality of slave stations by transmitting a signal of a battery saving cycle, wherein the master station specifies the n × m frames in each one battery saving cycle. Means for multiplexing a unique number into each of the time slots and transmitting the multiplexed numbers to the plurality of slave stations;
The plurality of slave stations have means for detecting the unique number multiplexed by the master station, means for generating a synchronization signal synchronized with the unique number detected by the detecting means, and predicting the unique number of the own station. The storage means and the means for generating a control signal for on / off controlling the power supply system of the own station based on the unique number stored in the storage means and the synchronization signal detected by the detection means. It

[0008]

The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a timing chart showing an example of signals of the respective parts shown in FIG. Here, as shown in FIG. 2 (a), the master station sends a signal in which n multi-frames consisting of m frames constitute one battery saving cycle (hereinafter referred to as 1BS cycle). ..

The point of the present invention is that the master station transmits by transmitting the unique number of each slave station in each n × m BS time slots in one BS cycle, and each slave station has a unique number of the BS time slot. Based on the above, a frame addressed to the own station is identified and a battery saving operation is performed.

Now, FIG. 1 shows a configuration for communication from the master station 1 to the slave station 2. The master station 1 generates a unique number signal Sb to be put into a BS time slot, and a unique number generating circuit 11 and a signal S indicating a frame synchronization pattern.
a multiplexing circuit 12 for multiplexing f and the unique number signal Sb;
The transmitter 13 is provided for modulating the transmission signal St and transmitting it to the slave station.

On the other hand, the slave station 2 receives a signal transmitted from the master station 1 and outputs a reception signal Sr, and a receiver 21.
A unique number detecting unit 22 for detecting a unique number signal from the S time slot, and a unique number for operating in a power-on state at all times to generate a synchronizing signal Ss in synchronization with the unique number put in the BS time slot by the master station 1. A synchronization circuit 25, a storage circuit 26 for storing a previously assigned unique number of its own station, and a control circuit 27 for generating a control signal Sc for performing on / off control of a power supply based on the corresponding unique number. I have it.

Further, the unique number detecting section 22 receives the received signal S
A frame synchronization circuit 23 that detects a signal Sf indicating a frame synchronization pattern from r and generates a frame synchronization signal Fs.
And a unique number separation circuit 24 that generates a timing pulse indicating the position of the BS time slot from the frame synchronization signal Fs and separates the unique number in the BS time slot from the received signal Sr.

Next, the operation will be described based on the timing chart shown in FIG.

First, in order to periodically control the power supply system of the slave station 2, the master station 1 generates the unique number signal Sb by the unique number generation circuit 11 and multiplexes the frame synchronization pattern signal Sf by the multiplexing circuit 12. Then, the transmission signal St as shown in FIG. Where 1 multiframe is m
This multi-frame is made up of n frames and has 1 BS cycle. A unique number is entered in each BS time slot of each frame Fn · m to F1 of the transmission signal St.

Now, assuming that the unique number of the slave station 2 is m-1, the receiving section 21 of the slave station 2 receives the transmission signal St from the master station 1 when the power is turned on, and the reception signal St of FIG. The received signal Sr is transmitted at the timing shown in FIG. Next, the unique number detecting unit 22 establishes frame synchronization and separates the unique number in the BS time slot of each received frame at the timing shown in FIG. Further, the unique number synchronizing circuit 25, which is always turned on, synchronizes with the intermittent unique number and generates a synchronizing signal Ss which is slave-synchronized with the master station.

On the other hand, the control circuit 27 can predict the timing of a signal arriving at its own station based on the unique number stored in the storage circuit 26, and in consideration of the rise time after power-on. Figure 2 by calculating the timing
At the timing shown in (d), the control signal Sc for controlling the on / off of the power supply system of the slave station is generated. Even for signals not using the multi-frame structure, if the power is turned on only in the frame F1 within the 1BS cycle and the incoming signal of the slave station is put in this frame F1, the same operation is performed. be able to.

[0018]

As described above, according to the present invention, in the system having the multi-frame structure, the master station transmits the BS station by inserting the unique number of each slave station into each BS time slot within one BS cycle. The station identifies the frame addressed to itself based on the unique number of the BS time slot and performs the battery saving operation, so that the slave station powers on for only one frame period and the presence or absence of an incoming signal from the master station. Therefore, it is not necessary to fixedly turn on the power for one multi-frame period as in the conventional case, and the effect of battery saving can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a timing chart showing an example of signals of respective parts shown in FIG.

[Explanation of symbols]

 11 unique number generation circuit 12 multiplex circuit 13 transmitter 21 receiver 22 unique number detector 25 unique number synchronization circuit 26 memory circuit 27 control circuit Sb unique number signal St master station transmission signal Sr slave station reception signal Ss synchronization signal Sc Control signal

Claims (1)

[Claims] 1. One master station transmits a signal for one battery saving cycle with n multi-frames (n is an integer of 2 or more) consisting of m frames each having a specific time slot, and a plurality of signals are transmitted. A battery saving method for controlling on / off of a power supply system of a slave station, wherein the master station multiplexes a unique number into each of the specific time slots of n × m frames within the one battery saving cycle. Means for transmitting to the plurality of slave stations;
The plurality of slave stations have means for detecting the unique number multiplexed by the master station, means for generating a synchronization signal synchronized with the unique number detected by the detecting means, and predicting the unique number of the own station. And a means for generating a control signal for controlling on / off of the power supply system of the own station based on the unique number stored in the storage means and the synchronization signal detected by the detection means. Battery saving method.