JPH07327002A - Radio communication equipment - Google Patents

Abstract

PURPOSE:To sufficiently reduce the power consumption at all times even in the case of carrier sensing and in the normal operation by operating a reception section only for a period required for the operation respectively in the searching state of a channel scheduled to be in use and in the usual operation. CONSTITUTION:When a control channel transits to a speech channel or only when a carrier sensing is executed due to occurrence of noise at a prescribed level due to interference with an adjacent channel and changed into other channel or the like, a 1st power saving pulse to be set over each sensing position with a margin is sent to a high frequency section 12. Then the high frequency section 12 is operated intermittently. On the other hand, a control section 22 sends a 2nd power saving pulse to the high frequency section 12 so as to be set with a margin corresponding to the slot scheduled in use to the high frequency section 12. Then the high frequency section 12 is operated intermittently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication device for performing time-division multiple access type digital modulation adopted in, for example, PHS (Personal Handyphone System).

[0002]

2. Description of the Related Art Conventionally, TDMA (time division) is used.
In an ion multiple access (time-division multiple access) type digital wireless communication device or the like, in order to set a standby time or a call time as long as possible, only a minimum necessary functional block is operated in a reception slot or a transmission slot. Was always.

FIG. 4 shows TDMA / TDD (time) used in PHS (Personal Handyphone System).
(division duplex: time division bidirectional) system. In the figure, "A" to "D" are terminals,
"AT" to "DT" indicate transmission timings from the base station to the terminals A to D, and "AR" to "DR" indicate reception timings from the terminals A to D at the base station. As described above, a signal on one frequency is divided into 8 slots per 5 milliseconds, and 4 slots are provided for downlink (from base station to terminal).
Four slots are assigned to the uplink (terminal → base station). That is, four bidirectional communication channels can be set on one carrier at the same time.

However, in a carrier for communication,
Whether the slot before and after the slot to be used is being used when changing from a control channel to a call channel, or when changing to another channel when noise occurs above a certain level due to interference with an adjacent channel In order to check the above, it is confirmed that the reception slot section (section of one slot length) is usable (vacant) over 4 consecutive frames within 2 seconds prior to transmission.
The action called career sense is obligatory.

FIG. 5 shows an example of a carrier sense method on the terminal side. FIG. 5 (2) shows the carrier sense position and FIG. 5 (3) for the slot to be used in FIG. 5 (1).
Shows a power saving pulse for controlling the operation timing of the device in accordance with the burst signal.

Numerical values in the figure represent the number of bits, and the slot to be used is composed of 220 bits sandwiched between four front and rear ramp bits (indicated as "R" in the figure).
With respect to this slot to be used, a central portion (indicated by “II” in the figure) of the slot, a front edge portion (indicated by “I” in the figure) of the slot located further in front of the ramp bit on the front side and the rear side 3 at the trailing edge (shown as "III" in the figure) located further behind the lamp bit on the side of FIG.
Carrier sense is executed as shown in (2).

In the figure, t1 is the time from the end of the sense of carrier sense I to the rise of the slot to be used, t2
Is the sense operation time of carrier sense I, t4 is the time from the fall of the slot to be used to the start of sense of carrier sense III, and t5 is the sense operation time of carrier sense III. Therefore, as the power saving pulse shown in FIG. 5C, not only the period of the slot to be used, but also a margin is added to the value obtained by adding t1 and t2 to the slot side preceding the slot to be used. At time t3, similarly, a margin is added to the value obtained by adding t4 and t5, and time t6 is added to the subsequent slot side.
It is necessary to take each minute as operation timing.

[0008]

However, the above-mentioned FIG.
With the power saving pulse of (3), when the control channel is switched to the communication channel, or when noise is generated at a certain level or more due to interference with the adjacent channel and the channel is changed to another channel, carrier sense is performed. The pulse timing is the same as that when carrier sense is executed, even when normal communication other than the above is executed. Therefore, although the power saving pulse is used for the purpose of preventing unnecessary power consumption by operating in accordance with the burst signal, the power saving pulse has an insufficient power saving effect.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to make it possible to constantly reduce the power consumption sufficiently during both carrier sense and normal operation. Wireless communication device.

[0010]

That is, the present invention is, in a wireless communication apparatus for communicating a predetermined channel by time division multiplexing, at the time of searching for a channel to be used, for example, the slot in the channel to be searched and the slots before and after it are straddled. During the search period, or during the normal operation, during the slot period in the used channel, the operation period at the time of reception is switched and controlled.

[0011]

With the above-described structure, the receiving section is operated only during the period required for the search of the channel to be used and the normal operation.
It is possible to effectively use the power source without wasting power.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention when the present invention is applied to PHS will be described below with reference to the drawings. FIG. 1 shows a circuit configuration of the entire terminal. Reference numeral 11 is an antenna, and 12 is a high frequency section for exciting the antenna 11 to transmit and receive a high frequency signal in the 1.9 GHz band.

In the high frequency section 12, a switch (SW) 12 which is directly connected to the antenna 11 and switches its transmitting / receiving state.
a, the PLL synthesizer 12 from the 1.9 GHz band high frequency signal received by the antenna 11 via the switch 12a.
A desired channel is selected in accordance with the local oscillation frequency signal of c, intermediate frequency conversion is performed by a three-stage mixer, and 250 MH
After receiving the intermediate frequency signal in the vicinity of z and 10 MHz and finally obtaining the intermediate frequency signal in the vicinity of 1 MHz and outputting the intermediate frequency signal to the next-stage modem 13, the intermediate frequency signal from the modem 13 is used in accordance with the local oscillation frequency signal of the PLL synthesizer 12c. 1.9GH
A transmitter 12 for converting into a high frequency signal of a desired channel in the z band and transmitting it from the antenna 11 via the switch 12a.
have d.

Therefore, the intermediate frequency signal obtained by the receiving section 12b of the high frequency section 12 is π / 4 shift Q in the modem 13.
IQ data is demodulated by performing PSK demodulation processing,
Furthermore, the data is converted into a serial data string and received as TDM.
While transmitting to the A processing unit 14, IQ data is created from the data transmitted from the TDMA processing unit 14 and a π / 4 shift QPSK modulation process is performed.
Output to 12d.

The TDMA processing unit 14 extracts a unique word (synchronization signal) from the received data sent from the modem 13 to establish frame synchronization, and scrambles the control data portion and voice data portion in this received data. Etc., the control data is sent to the control unit 22 and the voice data is sent to the speech codec unit 15, respectively.On the other hand, when the voice data is sent from the speech codec unit 15, the control data is sent to the voice data. Is added to create transmission data, scrambled, etc., and then added with a unique word or the like to be formatted, inserted at a predetermined timing of the TDMA frame, and transmitted to the modem 13.

The speech codec section 15 performs compression / expansion processing of digital audio data, and ADPCM (adaptive difference PCM) sent from the TDMA processing section 14.
32 [Kbps] (= 4 bits x 8 KHz)
Audio signal of 64 [Kbps] (= 8 bits x 8 KH
z) It is expanded by being decoded into a PCM voice signal and transmitted to the PCM codec unit 16, while the PCM voice signal is compressed by being encoded into an ADPCM voice signal from the PCM codec unit 16 and then compressed by the TDMA processing unit 14. Output to.

The PCM codec section 16 is connected to a speaker 18, a microphone 19 and an oscillation element 20 via an amplifier 17,
It performs D / A conversion and A / D conversion of audio signals.
The PCM voice signal sent from the speech codec unit 15 is D / A converted into an analog voice signal, which is amplified by an amplifier 17 and then amplified by a speaker 18 which is a receiver while being a transmitter. The analog voice signal input from the microphone 19 is A / D converted into a PCM voice signal and sent to the speech codec unit 15. The PCM codec unit 16 also controls the volume level of the audio signal, the ringer sound, the tone signal, and the like.

However, the high frequency section 12, the modem 13 and the T
DMA processing unit 14, speech codec unit 15 and PCM
Display unit 21, control unit 22, ROM for codec unit 16
24, RAM 25, recording / reproducing circuit 26 and memory 27 are connected.

The display unit 21 displays and outputs various operating states and the like. The control unit 22 controls the operation of other circuits while appropriately writing / reading control data to / from the RAM 25 based on a control program stored in the ROM 24 in accordance with a key input signal from the key input unit 23. In particular, the operation timing of the high frequency section 12 is also controlled as described later.

The recording / reproducing circuit 26 is, for example, a tape recorder, I
It is composed of a C memory and records a message message sent from the other party in the absence recording mode, and reproduces the recorded message message in response to an instruction.

The memory 27 stores in advance voice data of a response message to the other party indicating that the message recording mode is set and prompting for a message, and the response message is received in response to an incoming call in the message recording mode. Is output.

In the circuit configuration as described above, the control unit 22
The power saving pulse is transmitted in response to the transmission / reception of the burst signal performed by the high frequency unit 12, and the intermittent operation is executed to suppress the wasteful power consumption.

FIG. 2 shows a power saving pulse for a slot to be used on a predetermined channel. For the slot to be used shown in FIG.
Positions I to III for performing carrier sense as shown in FIG.
If there is, the control unit 22 performs carrier sense such as when changing from a control channel to a communication channel or when changing to another channel because noise is generated above a certain level due to interference with an adjacent channel. Only in such a case, as shown in FIG. 2C, the first power saving pulse that turns on with a margin over the sense positions I to III is sent to the high frequency unit 12, and the high frequency unit 12 is intermittently operated.

On the other hand, the control unit 22 is turned on with a margin corresponding to the slot to be used shown in FIG. 2 (1) during the normal communication operation without carrier sense. The power saving pulse No. 2 is sent to the high frequency unit 12 to operate the high frequency unit 12 intermittently.

Therefore, especially in the normal operation, "ts1 + ts" in FIG.
The power consumption can be reduced by the amount indicated by "2", and the high frequency unit 12 is operated only during the period required for each operation, so that the power can be effectively used without wasting power.

FIG. 3 shows another example of the operation in this embodiment. Further, during execution of carrier sense, the sense position II in the carrier to be used shown in FIG. Of the first power saving pulse shown in FIG. 3 (3) that is turned on with a margin corresponding to each of the sense position I and the sense position III in the carrier subsequent thereto,
If the high frequency unit 12 is operated intermittently, the power consumption during the execution of carrier sensing can be reduced significantly. Also in this case, the second power saving pulse shown in FIG. 3 (4) is turned on with a margin corresponding to the slot to be used shown in FIG. 3 (1) during the normal communication operation without carrier sense. To the high frequency unit 12,
12 is operated intermittently.

[0027]

As described above, according to the present invention, in a wireless communication device that communicates a predetermined channel by time division multiplexing, when searching for a channel to be used, for example, the slot in the channel to be searched and the slots before and after the slot are searched. Since the operation period at the time of reception is switched and controlled during the search period spanning over, and during the slot period in the used channel during the normal operation, it is possible to perform the search during the search for the channel to be used and during the normal operation. Thus, it is possible to provide a wireless communication device in which the receiving unit is operated only during a period required for each operation, the power is not wastefully consumed, and the power source can be effectively used.

[Brief description of drawings]

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

FIG. 2 is a diagram for explaining an operation according to the embodiment.

FIG. 3 is a diagram for explaining another operation according to the embodiment.

FIG. 4 is a diagram for explaining a TDMA / TDD system.

5 is a diagram exemplifying carrier sense operation timing on the terminal side in the system of FIG. 4;

[Explanation of symbols]

11 ... Antenna, 12 ... High frequency part, 12a ... Switch, 12b ...
Receiver, 12c ... PLL synthesizer, 12d ... transmitter, 13
... Modem, 14 ... TDMA processing section, 15 ... Speech codec section, 16 ... PCM codec section, 17 ... Amplifier, 18 ...
Speaker, 19 ... Microphone, 20 ... Oscillator, 21 ... Display, 22
... control section, 23 ... key input section, 24 ... ROM, 25 ... RAM,
26 ... Recording / playback circuit, 27 ... Memory.

Claims (3)

[Claims] 1. A wireless communication device for communicating a predetermined channel by time division multiplexing, wherein the operating period of a receiving section is different between when searching for a channel to be used and during normal operation. 2. In a wireless communication device for communicating a predetermined channel by time division multiplexing, when searching for a channel to be used, it is used during a search period spanning the slot in the channel to be searched and the slots before and after the slot, and during normal operation. A radio communication device, comprising control means for switching and controlling an operation period during reception during the slot period in the channel. 3. In a wireless communication apparatus for communicating a predetermined channel by time division multiplexing, during a search for a channel to be used, during a search period dispersed in the slot to be searched and the slots before and after the slot, during normal operation, in the used channel. In the slot period, the wireless communication device is provided with control means for switching and controlling an operation period at the time of reception.