JP2000022571A - Communications terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication terminal equipment capable of performing interval reception without depending on data from a base station. SOLUTION: By the processings of steps SA1-SA6, the N interval of a received burst transmitted from the base station 13 detected and the value is stored in a register A. Also, the N interval of the received burst is detected again and the value is stored in the register B (step SA7). Then, whether or not a difference between the N interval value of a first time stored in the register A and the N interval value of a second time stored in the register B is within an allowable range is discriminated (step SA8). When the difference of both is within the allowable range, a counted value stored in the register A or B is defined as the N interval value (step SA9) and N interval reception is started by using the N interval value (step SA10).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a communication terminal.

[0002]

2. Description of the Related Art Conventionally, in a communication terminal, for example, a PHS, in forming a standby state, reception is performed at a fixed time interval called an N interval in order to receive a reception burst from a base station. When performing this N-interval reception, data from the base station is received in advance, and N-interval reception is started based on the received data.

[0003]

However, as described above, conventionally, when starting N-interval reception, data must be received from the base station in advance. Therefore, N-interval reception cannot be started until data is transmitted from the base station, and during that time, the CPU or the like must be operated to maintain the active state. For this reason, the power consumption is increased, the battery life is shortened, and the standby time is shortened.

The present invention has been made in view of such a conventional problem, and has as its object to provide a communication terminal capable of performing interval reception without depending on data from a base station. Is what you do.

[0005]

According to a first aspect of the present invention, there is provided a communication terminal, comprising: a receiving unit; a signal transmitted at a predetermined timing and received by the receiving unit; And a control means for determining the timing of the intermittent reception operation based on the reception interval detected by the detection means. Therefore, if a signal transmitted at a predetermined timing is received and the reception interval is detected without receiving data for performing the interval reception, the interval reception at the detected interval is started from that point. Can be.

In the communication terminal according to the second aspect of the present invention, the detecting means detects the reception interval a plurality of times, and the control means determines that a difference between the plurality of detection results is within an allowable range. When it is within, the receiving means is operated at the detected reception interval. That is, if the difference between the detection results of the plurality of times is within the allowable range, it can be determined that the reception interval of the signal transmitted at a predetermined timing and received by the receiving unit has been accurately detected. Therefore, by performing the interval reception by operating the receiving means at the reception interval accurately detected, the reception can be performed accurately even if the interval reception is performed at the reception interval detected without using data.

According to a third aspect of the present invention, the communication terminal further comprises a correction unit for correcting the reception interval when the signal cannot be received by the reception unit operating at the detected reception interval. The control means operates the receiving means at the reception interval corrected by the correction means. Therefore, after the interval reception is started at the detected reception interval, if the reception interval is not appropriate, the reception interval is corrected,
Proper interval reception is ensured.

According to a fourth aspect of the present invention, in the communication terminal device, the control means may determine whether the signal whose reception interval has been detected by the detection means is transmitted from the same base station. Means for determining whether or not the data is transmitted from the same base station. That is, when signals from different base stations are continuously received and the reception interval is detected, the reception interval may be different for each base station. Interval reception cannot be performed. However, if the signal is transmitted from the same base station, if the receiving means performs receiving operation at the detected reception interval, the transmission interval from the base station and the reception interval of the communication terminal match, Interval reception can be performed properly.

According to a fifth aspect of the present invention, in the communication terminal according to the fifth aspect of the present invention, when the reception interval detected by the detection unit is an integral multiple of a reception interval defined by a standard, The timing of the intermittent receiving operation is determined at a multiple of the receiving interval. That is, when a signal transmitted at a predetermined timing is received, for example, when the next signal is received one after another due to a reception error or the like, the reception interval of the detected signal is the standard reception interval which is the original reception interval. The reception interval is twice as long as the reception interval defined by the above. If the interval is doubled, the reception error occurs. However, if the interval is set to a multiple of the reception interval, that is, half the reception interval in this example, the reception timing and the transmission timing match.

According to a sixth aspect of the present invention, in the communication terminal according to the sixth aspect of the present invention, the control unit is configured to control the reception interval detected by the detection unit to be an integral multiple of a reception interval defined by a standard. , The timing of the intermittent reception operation is defined as a reception interval localized according to the standard. That is,
As described above, when a signal transmitted at a predetermined timing is received, due to a reception error or the like, for example, when the next signal is received, the reception interval of the detected signal is equal to the original reception interval. Is twice as long as the reception interval defined by the standard, and if an interval is performed at twice this reception interval, a reception error will occur. However, in this case, if the interval is set at the reception interval defined in the standard, the reception timing and the transmission timing match.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In this embodiment, the present invention
This is applied to the terminal device. That is, as shown in FIG. 1, the antenna 1 of this terminal is connected to a transmission / reception unit 2, and the transmission / reception unit 2 includes a frequency conversion unit and a modem. On the receiving side, the frequency converter receives the signal input from the antenna 1 via an antenna switch for distributing transmission / reception, and mixes the signal with a local oscillation signal of a predetermined frequency output from the PLL synthesizer. The frequency is converted to an IF signal near 9 GHz. On the transmitting side, the π / 4 shift Q input from the modem
By mixing the PSK modulated wave with a local oscillation signal of a predetermined frequency output from the PLL synthesizer, 1.9 is obtained.
The frequency is converted to a GHz band and radiated from the antenna 1 via the antenna switch. On the receiving side of the modem, the IF signal from the frequency converter is demodulated and separated into IQ data.
The data is transferred to the communication control unit 3 as a data string. On the transmission side, IQ data is created from the data transferred from the communication control unit 3, modulated by π / 4 shift QPSK, and output to the frequency conversion unit.

The communication controller 3 processes frame synchronization and slot data format. That is, on the receiving side, data for one slot is taken out at a predetermined timing from the received data sent from the modem of the transmitting / receiving unit 2, and a unique word (synchronization signal) is extracted from this data to obtain frame synchronization. After descrambling the control data section and the audio data section, the control data is sent to the control section 5, and the audio data is transferred to the audio processing section 4. On the transmission side, control data and the like are added to the sound data transferred from the sound processing unit 4 to create the data, and after scrambling and the like, a unique word and the like are added to create transmission data for one slot. At a predetermined timing, it is inserted into a predetermined slot in the frame and transmitted to the modem of the transmission / reception unit 2.

The voice processing unit 4 is composed of a speech codec and a PCM codec. The speech codec performs compression / expansion processing of digital data. On the receiving side, the ADP sent from the communication control unit 3 is used.
CM audio signal (4 bit x 8 kHz = 32 Kbps) to PCM audio signal (8 bit x 8 kHz = 64 Kbps)
And decompressed to output to the PCM codec. On the transmission side, the PCM audio signal transmitted from the PCM codec is encoded into an ADPCM audio signal, compressed and output to the communication control unit 3. P
The CM codec performs an analog / digital conversion process. On the receiving side, the PCM audio signal sent from the speech codec is D / A converted and the analog audio signal is output to the speaker 5. On the transmitting side, the analog audio signal input from the microphone 6 is A / D converted and the PCM audio signal is output to the speech codec.

The control section 7 receives key operation information from a key input section 8 having a clock counter and various keys. The control unit 7 operates based on the key operation information and the program stored in the ROM 9 while using the RAM 10 as a work area, and controls the entire apparatus including the display unit 11 according to a predetermined protocol.

In the present embodiment having the above-described configuration, when the power is turned on, the control unit 7 operates according to the flowchart shown in FIG. 2 and receives signals transmitted from the base station (CS) at the timing of N intervals. It is determined whether the reception of the burst (signal (1) in FIG. 3) has been completed (step SA1). Then, when the reception of the reception burst is completed, after counting by the clock counter is started (step SA2), it is determined whether or not the next reception burst (signal (2) in FIG. 3) has been received (step SA).
3) When the next reception burst is received, the counting by the clock counter is stopped (step SA4). Next, it is determined whether or not the count by the clock counter is the first time (step SA5). In the first time, as in the case where the N intervals between the reception bursts (1) and (2) in FIG. If there is, the count value of the clock counter is stored in the register A (step SA)
6).

Subsequently, returning to step SA1, it is determined whether or not the reception of the reception burst (signal (2) in FIG. 3) which has been started in step SA3 has been completed. When the reception of the reception burst is completed, the counting by the clock counter is started (step SA).
2) It is determined whether or not the next reception burst (signal (3) in FIG. 3) has been received (step SA3), and if the next reception burst has been received, counting by the clock counter is stopped (step SA4). . Next, it is determined whether or not the count by the clock counter is the first time (step SA5). In the first time as in the case where the N intervals between the reception bursts (2) and (3) in FIG. If it is the second time, the count value by the clock counter is stored in the register B (step SA7).

Next, the first N stored in the register A
It is determined whether or not the difference between the interval value and the second N interval value stored in the register B is within an allowable range (step SA8). As a result of this determination, if the difference between the two is within the allowable range, the actual N
It can be said that the interval was correctly detected.
Therefore, the N interval value is determined using the count value stored in the register A or B as the N interval value (step SA9), and intermittent reception, that is, N interval reception is started using this N interval value (step SA10). ).

Therefore, as shown in FIG. 3, after receiving the reception burst (3) from the base station, N-interval reception can be performed even before receiving data from the base station. Therefore, it is possible to avoid the power consumption caused by performing the continuous reception until the data is received and the power consumption caused by operating the display unit 11 during that time, to improve the battery life, and to perform the one-time operation. The standby time that can be achieved by charging can be extended.

Further, the timing of the reception burst actually transmitted from the base station is detected as described above, and the value is used to calculate N
Since interval reception is performed, even if the superframe N interval value differs or changes depending on the receiving base station, N interval reception is performed without requiring download data or program change. Can be.

On the other hand, step S following step SA10
In A11, it is monitored whether or not a reception error has occurred during N interval reception at the timing using the N interval value. And if no reception error occurs,
The N-interval reception at the above timing is continued, and if a reception error that cannot receive the reception burst from the base station occurs, the N-interval value is corrected (step SA12), and the processing from step SA10 is repeated.
Therefore, by repeating the loop from step SA10 to step SA12, N interval reception can be performed while always matching the reception burst timing from the base station. Therefore, even when the terminal carrying the terminal moves from a base station transmitting a reception burst at a different timing to a state where reception is performed, N interval reception can be performed without any problem. In addition,
When the intermittent reception at the N interval value is completely removed or when the base station ID changes, the processing is executed from step SA1.

On the other hand, when the difference between the first N interval value stored in the register A and the second N interval value stored in the register B exceeds the allowable range as a result of the determination in step SA7, After the second N interval value stored in the register A is stored in the register A (step SA13), the processing from step SA1 is repeated. Then, when the determination in step SA5 is performed, since it is not the first time, the process proceeds from step SA5 to step SA7, where the count value is stored in the register B, and thereafter, the processing after step SA8 is performed.

Therefore, in this embodiment,
N-interval reception using the detected N-interval value is started only when the N-interval value detected immediately before and after is within an allowable error, that is, only when the actual N-interval value can be accurately detected. I do. Therefore, even if N-interval reception is started without receiving data from the base station, reception can be accurately performed at the reception burst timing.

In this embodiment, N interval reception using this count value is started when the count value of two consecutive N intervals is within the allowable error. N-interval reception may be started at the time when a large number of count values are within the allowable error, whereby the reception accuracy at the time of N-interval reception can be improved.

FIG. 4 shows a processing procedure of the control unit 7 according to another embodiment of the present invention. That is, when the power is turned on, the control unit 7 operates according to the flowchart shown in FIG. 4, and receives the reception burst (signal (1) in FIG. 5) transmitted from the base station (CS) at the timing of N intervals. (Step SB)
1). When the reception burst is received, the ID of the base station included in the reception burst is obtained (step SB2). Subsequently, it is determined whether the reception of the reception burst (the signal (1) in FIG. 5) is completed (step S).
B3) If completed, after counting by the clock counter is started (step SB4), counting is continued until the next received burst is received (step SB5), and if the next received burst is received, the clock counter is counted. Is stopped (step SB6).

Further, the ID of the base station included in the received burst received in step SB5 is obtained (step SB7), and the base station ID obtained in step SB2 is obtained.
(Step SB8). As a result of this comparison, if the base station ID obtained in step SB2 and the base station ID obtained in step SB7 do not match, step SB1
The burst received at step SB5 and the burst received at step SB5 are from different base stations. Therefore,
In this case, since the interval of the reception burst from a certain base station is not correctly detected, step S
Returning to B1, the process is repeated again.

However, as a result of the determination in step SB8,
The base station ID acquired in step SB2 and step SB7
If the base station ID obtained in step SB1 matches, the flow advances to step SB1.
The burst received at step SB5 and the burst received at step SB5 are from the same base station. Therefore,
In this case, it can be assumed that the interval between reception bursts from the same base station is correctly detected by the count value of the clock counter.

Then, it is determined whether or not the count value of the clock counter is twice or more (integer multiple) of the N interval value in the predetermined standard value (RCRST-28 standard) (step SB9). As a result of this determination, if the count value is an N interval value (including an allowable error),
FIG. 5 shows a case where N intervals between the reception burst (1) and the reception burst (2) are detected, and it can be said that the actual N intervals can be accurately detected by the clock counter. Therefore, the N interval value is determined using the count value as the N interval value (step SB10), and the intermittent reception, that is, the N interval reception is started using this N interval value (step SB11). Therefore, in this embodiment, when N intervals have been detected once, N interval reception using the detected value can be started early, and N interval reception is started early, thereby reducing power consumption. Can be further reduced.

If it is determined in step SB9 that the count value of the clock counter is twice or more (integer multiple) the N interval value which is a predetermined standard value, the process proceeds from step SB5 to step SB8. The count value for the multiple is determined as the N interval value. That is, when the count value of the clock counter is an integral multiple of the N interval value, as shown in FIG. 5, for example, after the reception of the reception burst (1) is completed, the reception burst (2) is generated due to a reception error or the like. Without receiving (×), the receiving burst (3) is received (〇),
As a result, the count value T becomes an integral multiple of the N interval value (twice in this example). Therefore, in this case, 1 / integer multiple of the count value T is calculated and determined as the N interval value. In this example, 1/2 of the count value T is calculated and determined as the N interval value. Of course, for example, after the reception of the reception burst (1) is completed, the reception burst (2) due to a reception error or the like.
If the reception burst (4) is received without receiving (3) and (3), and the count value T becomes three times the N interval value in the RCR standard, 1/1 of the count value 3 is calculated and determined as the N interval value.

Thereafter, similarly to the above, N interval reception is started with the determined N interval value (step SB11). Therefore, in this embodiment, even if a sequential reception burst cannot be received due to a reception error or the like, N interval reception can be performed using the detected N interval value.

If the synchronization is lost or the base station is changed, the process may be executed again from step SB1. Further, the count value includes an allowable error of N intervals.

In this embodiment, when the count value is an integral multiple of the N interval value, which is a predetermined standard value, "count value / multiple" is calculated from the count value and is calculated as the N interval value. I decided to decide,
The N interval value itself defined in the standard may be determined as the N interval value.

[0032]

As described above, according to the present invention, a signal transmitted at a predetermined timing is received in advance, the reception interval is detected, and the timing of the intermittent reception operation is determined based on the detected reception interval. Therefore, the interval reception can be started without receiving the data for performing the interval reception. Therefore, the interval reception can be started quickly to reduce the power consumption, and the battery life can be suppressed from being shortened, and the standby time can be lengthened. In addition, since the reception interval of the transmitted signal is actually detected and the interval reception is performed at the reception interval, even if the interval value differs or changes depending on the receiving base station, the download is performed. Interval reception can be performed without requiring data or program changes.

Further, the receiving interval is detected a plurality of times, and when the difference between the detection results is within an allowable range, the receiving operation is performed at the detected receiving interval. Interval reception is started at the time of detection, so that even if interval reception is performed at the detected reception interval without using data, reception can be performed with high accuracy.

If the receiving interval is not proper after the interval receiving is started at the detected receiving interval,
Since the reception interval is corrected, appropriate interval reception can be ensured over time.

Further, it is determined whether or not the signals whose reception intervals have been detected are transmitted from the same base station.
In the case where the signals are transmitted from the same base station, the receiving means is made to perform the receiving operation at the above-mentioned receiving interval, so that the transmitting interval from the receiving base station and the receiving interval of the communication terminal are matched. Thus, the interval reception can be properly performed.

When the detected reception interval is an integral multiple of the reception interval defined by the standard, the timing of the intermittent reception operation is determined at a multiple of the multiple of the reception interval. Is set to the reception interval localized according to the standard, the reception timing matches the transmission timing even if the next signal is received, for example, due to a reception error. As a result, it is possible to appropriately perform interval reception.

[0037]

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a circuit configuration according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing procedure of a control unit in the embodiment.

FIG. 3 is a timing chart showing the operation of the embodiment.

FIG. 4 is a flowchart showing a processing procedure of a control unit according to another embodiment of the present invention.

FIG. 5 is a timing chart showing the operation of the embodiment.

[Explanation of symbols]

 2 transmitting / receiving unit 7 control unit 11 display unit

Claims (6)

[Claims] 1. A receiving means, a detecting means for detecting a receiving interval of a signal transmitted at a predetermined timing and received by the receiving means, and an intermittent receiving operation based on the receiving interval detected by the detecting means Control means for determining the timing of the communication. 2. The method according to claim 1, wherein the detecting unit detects the reception interval a plurality of times, and the control unit detects the reception unit at the detected reception interval when a difference between the plurality of detection results is within an allowable range. The communication terminal according to claim 1, wherein the communication terminal operates. 3. The apparatus according to claim 2, further comprising: a correction unit configured to correct the reception interval when the signal cannot be received by the reception unit that operates at the detected reception interval, wherein the control unit corrects the signal by the correction unit. The communication terminal according to claim 1, wherein the receiving means is operated at a receiving interval. 4. The control means includes means for determining whether a signal whose reception interval has been detected by the detection means is a signal transmitted from the same base station, and transmitting the signal from the same base station. 2. The receiving means according to claim 1, wherein said receiving means performs a receiving operation at said receiving interval.
The communication terminal as described. 5. The control unit, when the reception interval detected by the detection unit is an integral multiple of a reception interval defined by a standard, sets the timing of the intermittent reception operation at a multiple of the multiple of the reception interval. The communication terminal according to claim 1, wherein the communication terminal is determined. 6. The control unit, when the reception interval detected by the detection unit is an integral multiple of a reception interval defined by a standard, sets the timing of the intermittent reception operation to a reception interval determined by the standard. The communication terminal according to claim 1, wherein: