JPH06169278A - Intermittent reception system - Google Patents

Abstract

PURPOSE:To attain sure detection and to reduce power consumption even when an intermittent reception interval of a receiver is extended. CONSTITUTION:A leader part of a radio signal sent from a transmitter is formed to be m-sets of frames comprising blocks with m-bits data strings. A receiver uses a storage section 5 to store the arrangement state of bits of the leader part of the radio signal in advance and a control section 4 compares a data content in m-bits to be received with the storage content when optional consecutive m-bits of the leader part are received. Thus, the receiver discriminates a start position of a data part and controls it that no reception is executed before the data part is not started.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intermittent receiving system for a receiver using a storage battery as a power source.

[0002]

2. Description of the Related Art Conventionally, in a radio apparatus, a receiver of this type normally performs intermittent reception in order to reduce power consumption.
When the receiver is performing discontinuous reception, when it detects the reader section of the radio signal composed of the reader section and the data section transmitted from the transmitter, the receiver shifts from the intermittent reception operation to the continuous reception operation and It receives the copies. In general, the length of the reader unit is set longer than the length of the intermittent reception interval of the receiver so that the reader unit can be reliably received.

[0003]

However, if the length of the intermittent reception interval is increased in order to reduce the power consumption of the receiver, the length of the reader section of the radio signal transmitted from the transmitter must be increased. I will have to do it. If the length of the reader unit is increased, the time from when the receiver detects the reader unit to when it starts detecting the data unit becomes longer,
There is a problem that the power consumption of the receiver increases.

The present invention has been made in view of the above points, and it is an object of the present invention to reliably detect and reduce power consumption even if the intermittent reception interval of a receiver is lengthened. The purpose is to provide the intermittent reception method.

[0005]

SUMMARY OF THE INVENTION The present invention comprises a receiving circuit for receiving a radio signal, a decoder for decoding the received signal,
Intermittent wireless device including a receiver having a storage unit for storing data, a control unit for controlling each unit, and a storage battery as a power source, and a transmitter for transmitting a wireless signal composed of a reader unit and a data unit In the reception system, the reader section of the radio signal is configured by arranging m frames composed of blocks composed of an m-bit data string, and the receiver receives any continuous m bits of the reader section, The control unit determines the start position of the data unit according to the content of the received m-bit data, and controls not to perform the receiving operation until the data unit starts. It is a thing.

[0006]

In the intermittent receiving system of the present invention, the reader section of the radio signal transmitted from the transmitter is formed by arranging m frames each consisting of a block composed of an m-bit data string. Then, the arrangement state of the bits of the reader section of the radio signal is stored in advance, and when any consecutive m bits of the reader section are received, the control section receives the received m bits.
By comparing the data content of the bit and the stored content, the start position of the data section is determined, and the receiving operation is controlled until the data section starts.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a receiver according to the present invention. 1 is a receiving antenna, 2 is a receiving circuit, 3 is a decoder that decodes the data content of a received signal received by the receiving circuit 2, 4 is a control unit that controls each unit, and 5 is a storage unit that stores data, Particularly, in this embodiment, the bit contents of the reader section of the radio signal from the transmitter (not shown) are stored in advance. Reference numeral 6 denotes a storage battery that supplies power to each of the above parts. Reference numeral 7 is a switch for switching on / off of power supply to the receiving circuit 1 in response to a signal from the control unit 4.

The radio signal transmitted from the transmitter comprises a reader section and a data section following it, as shown in FIG. The reader unit is composed of, for example, eight consecutive 8-bit frames. The data sequence of each frame is different, and in this embodiment, the number of "1" bits is increased by one in sequence from the first frame.

The storage unit 5 stores in advance the contents (the number of "0" s or "1s" and the arrangement status thereof) of the data sequence of each frame of the reader unit of the radio signal in a format as shown in FIG. Keep it. That is, in the first frame,
Only the bits of msb are "1", and the bits of "1" are increased by one in order from the second frame onward, and in the eighth frame, all bits from msb to lsb are "1".
It has become.

The intermittent reception operation will be described with reference to the timing chart of FIG. a is the interval of intermittent reception, and b is the time from the time when the reception of the reader unit is finished to the time when the reception of the data unit is started. The length of the reader unit is set longer than the length of the intermittent reception interval a.

The control unit 4 detects any continuous 8 bits of the received reader unit, calculates the time to the start time of the data unit from the continuous 8-bit bit array, and receives up to that time. Switch 7 to prevent
Is off.

As an example of calculating the time to the start time of the data part, for example, if the continuous 8 bits of the received reader part are "00011000", the reception end point is the second.
It is the fifth bit of the frame, and reception may be stopped during the time from the sixth bit of the second frame to the eighth bit of the eighth frame. If the continuous 8 bits of the received reader unit are “10000011”, the reception end point is the second bit of the fourth frame, and the time from the third bit of the fourth frame to the eighth bit of the eighth frame. Should not be received.

As described above, according to this embodiment, even if the intermittent reception interval of the receiver is lengthened and the time of the reader section of the radio signal is lengthened so that the signal is more reliably received, the receiver still receives. Since it is possible to recognize which part of the reader unit has been received at that point in time, it is possible to suspend the receiving operation until the start position of the data unit and reduce power consumption.

[0015]

As described above, according to the receiving system of the present invention, the reader unit of the radio signal transmitted from the transmitter is
It is assumed that m frames each consisting of a block made up of a data string of bits are arranged, and the receiver stores the arrangement state of the bits of the reader section of the radio signal in advance, and stores any consecutive m bits of the reader section. Upon reception, the control unit determines the start position of the data section by comparing the received m-bit data content with the stored content, and does not perform the receiving operation until the data section starts. As a result, even if the intermittent reception interval of the receiver is lengthened, it is possible to provide an intermittent reception system that reliably detects and reduces power consumption.

[Brief description of drawings]

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

FIG. 2 is a format diagram of a radio signal according to the above.

FIG. 3 is a time chart for explaining the same operation as above.

FIG. 4 is a schematic diagram showing stored contents of a storage unit according to the above.

[Explanation of symbols]

 1 receiving antenna 2 receiving circuit 3 decoder 4 control unit 5 storage unit 6 storage battery 7 switch

Claims (1)

[Claims] 1. A receiver and a reader unit each having a receiving circuit for receiving a radio signal, a decoder for decoding the received signal, a storage unit for storing data, a control unit for controlling each unit, and a storage battery as a power source. In a discontinuous reception system of a wireless device comprising a transmitter for transmitting a wireless signal composed of a data section and a data section, a reader section of the wireless signal is used as a m-th frame composed of a block composed of an m-bit data string.
In the receiver, the receiver receives arbitrary continuous m bits of the reader unit, and the control unit determines the start position of the data unit based on the received m-bit data content. The intermittent reception method is characterized in that the reception operation is controlled until the start.