JP3394471B2 - Mobile communication terminal system and standby method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable communication terminal system suitable for standby reception of public systems and self-employed systems, and a standby method thereof.

[0002]

2. Description of the Related Art A second generation telephone system has been developed in which a public system or a self-employed system connected to a fixed network and a mobile communication terminal such as PHS communicate with each other by a time division multiplexing wireless communication system. This call method is used outdoors through a public system and indoors through a private system.

Then, at the time of waiting for an incoming call, the PHS obtains broadcast information including channel structure information transmitted by the public system or the self-employed system, and further obtains the PCH from the broadcast information.
The receiving operation is performed intermittently in accordance with the transmission timing of the (paging channel).

That is, the PHS generally performs standby reception of the public system and the self-employed system at standby timing of every 1.2 seconds.

[0005]

However, in the above-mentioned conventional communication method, both the public system and the private system transmit the PCH at the same intermittent intervals of 1.2 seconds. Also, since both systems generally operate asynchronously, a phenomenon occurs in which PCH timings overlap.

Incidentally, two waves of 12CH and 18CH are used in the private system, and one wave is used in the public system. Therefore, for example, in a self-employed system as shown in FIG. 8 to be described later, when 12CH and 18CH are very close to the PCH of the public system, the PHS has only one receiving unit, and therefore the public system It is limited to either one of the stand-by for the system or the stand-alone system. For this reason, reception of incoming information is limited to reception from either one of the systems, which causes a problem that the other cannot be received.

The present invention has been made in view of the above circumstances, and provides a portable communication terminal system and a standby method thereof capable of preventing a poor incoming call due to overlapping PCHs. Is.

[0008]

A mobile communication terminal system according to claim 1 is a mobile communication terminal system for simultaneously receiving and receiving both a public system and a private system by the mobile communication terminal, wherein the private system is a mobile communication system. If the incoming information of the public system and the PCH (paging call channel) sent from the terminal to the terminal approaches or overlaps at the same timing, the sending timing of the PCH of the own station is set to LCCH.
PC from public system without changing frame structure
It is characterized in that it is set every 1/2 of the H transmission timing . Mobile communication terminal system according to claim 2, Mobile communication
Both public system and self-employed system can be
A mobile communication terminal system for receiving and receiving at the same time,
A self-employed system is a public system sent to a mobile communication terminal.
PC and incoming call information from the local station
If the reports are close or overlap at the same timing, the P
CH transmission timing to PCH from public system
Change so that they are not in close proximity or overlap , and
The self-employed system includes a first antenna that transmits and receives a first wireless signal to and from a mobile communication terminal, a demodulation unit that demodulates the first wireless signal into a baseband signal, and demodulated audio data to the main device. A line interface unit for transmitting, a modulator for modulating the multiplexed data signal, a second antenna for receiving a second radio signal from the public system,
From the second radio signal to LCCH (downlink logical control channel)
The signal detection unit for detecting the PCH included in the PCH is compared with the transmission timing of the PCH transmitted from the public system and the transmission timing of the PCH from the own station, and when the transmission timings of both PCHs are close or overlap, And a control unit for setting the PCH transmission timing of the station to each half of the PCH transmission timing of the public system. In addition, the control unit notifies the mobile communication terminal of the position information of the PCH, the control carrier configuration information indicating the number of broadcasts and the transmission interval from the BCCH (broadcast channel) included in the LCCH (downlink logical control channel), and the mobile communication terminal Is BC
It is possible to change the reception timing of the PCH based on the CH. A standby method for a mobile communication terminal system according to claim 4 is a standby method for a mobile communication terminal system in which the mobile communication terminal simultaneously receives and receives both a public system and a self-employed system, and is sent to the mobile communication terminal. P from public and private systems
The first step of comparing the transmission timing of the incoming call information of the CH (paging channel) and the comparison result shows that when the PCHs are close to or overlap with each other at the same timing, the transmission timing of the PCH of the own station is set to the LCCH frame structure. Without changing
Every 1/2 of PCH transmission timing from public system
And a second step. How standby mobile communication terminal system according to claim 5, wherein the portable communication
Both public system and self-employed system can be
How to stand by for a mobile communication terminal system that receives and receives at the same time
The public communication system transmitted to the mobile communication terminal.
PCH from system and self-employed system
First step of comparing the transmission timing of incoming call information
As a result of the comparison, the PCHs come close or
If it becomes
Do not come close to or overlap the PCH from the stem
And a second step of changing the first radio signal to a baseband in the first and second steps, the third step of transmitting and receiving the first radio signal to and from the mobile communication terminal. 4th step of demodulating to a main device, a 5th step of transmitting the demodulated voice data to the main device, a 6th step of modulating the multiplexed data signal, and a 6th step from the public system. 7th step of receiving the second radio signal, 8th step of detecting the PCH included in the LCCH (downlink logical control channel) from the second radio signal, and the P sent from the public system
When the CH transmission timing and the PCH transmission timing from the own station are compared, and the transmission timings of both PCHs are close to or overlap with each other, the PCH transmission timing of the own station is
And a ninth step in which the transmission timing of the PCH of the public system is set every ½. In the ninth step, the BCCH (broadcast channel) included in the LCCH (downlink logical control channel) notifies the mobile communication terminal of the position information of the PCH, the control carrier configuration information indicating the number of broadcasts, and the transmission interval, The step of changing the reception timing of the PCH of the mobile communication terminal can be included. In the mobile communication terminal system and the standby method thereof according to the present invention, when the mobile communication terminal simultaneously receives and receives both the public system and the self-employed system,
When the private system sends out to the mobile communication terminal the incoming information of the public system and the PCH (paging channel) from its own station at the same timing or in close proximity,
The transmission timing of the PCH of the own station is the LCCH frame
Sending PCH from public system without changing the structure of
It should be set every 1/2 of the imming .

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

FIG. 1 is a block diagram showing a self-employed system according to an embodiment of a mobile communication terminal system of the present invention, and FIGS. 2 to 10 are diagrams for explaining the operation of the mobile communication terminal of FIG. is there.

The self-employed system shown in FIG.
Antenna (# 1) 11, received signal amplifier 12, demodulator 1
3, line interface unit 14, modulation unit 15, transmission signal amplification unit 16, antenna switching unit 17, antenna (# 2) 1
8, a reception signal amplifier 19, and a signal detector 20.

The control unit 10 takes in control data from a PHS (not shown), and sends LCCH (downlink logical control channel) to voice data (TXD), control data and PHS from a main unit (not shown). Control information is multiplexed with the data signal. Where LCCH is
As will be described later, BCCH (broadcast channel) and PCH
(Paging channel) and SCCH (channel for individual cell). Further, the control unit 10 controls the LCC
Setting processing of the notification information element of H is performed.

Antenna (# 1) as the first antenna
11 receives an upstream radio signal as a first radio signal from a PHS (not shown). The reception signal amplification unit 12 amplifies the received uplink radio signal. The demodulation unit 13 demodulates the uplink radio signal into a baseband signal, and
The control data and audio data from S are separated.

The line interface unit 14 sends voice data (RXD) to a main device such as a switching system. The modulator 15 modulates the data signal multiplexed by the controller 10.

The transmission signal amplification section 16 amplifies the data signal modulated by the modulation section 15. Antenna switching unit 1
The controller 7 is appropriately switched to the transmitting side and the receiving side by the control unit 10.

Antenna as the second antenna (# 2)
Reference numeral 18 receives a radio signal as a second radio signal transmitted from a public system (not shown) connected to the fixed network. The reception signal amplification unit 19 amplifies the wireless signal.
The signal detection unit 20 extracts a PCH (Paging Channel) signal from the public system.

Next, the above-mentioned LCCH (downlink logical control channel), BCCH (broadcast channel), PCH (paging channel), and SCCH (dedicated cell channel) will be described.

First, FIG. 2 shows the timing of transmission and reception by radio signals from the PHS.

The radio signal between the self-employed system and the PHS is a TDD (Time Div) that alternately uses transmission and reception every time.
ision duplex) time division communication is used.
Further, time division multiplex communication by the TDMA (Time Division Multiple Access) method is also used.

In FIG. 2, one frame of TDMA is
The time length is 5.0 mS, and each of the transmission and reception is 2.5 mS. Furthermore, both transmission and reception are divided into four parts with a time length of 625 μS.

The control information sent from the private system to the PHS is sent at the timing of LCCH (downlink logical control channel). Here, the minimum cycle of the LCCH (5 × n × m) that specifies the slot positions of all LCCH elements
(MS): n and m are both integers) is defined as an LCCH superframe.

LCCH is BCCH (broadcast channel)
And a PCH (paging channel) and an SCCH (dedicated cell channel). BCCH is LC
It is transmitted in the CH start slot, and the BCCH transmission notifies the LCCH start position.

At the timing of the LCCH superframe, the SCCH is normally transmitted to the PHS. P
When an incoming event occurs in the HS, the PCH is transmitted to the 4th and 8th positions from the BCCH. The position of the PCH is notified from the private system to the PHS by the control carrier configuration information element in the radio channel information notification message on the BCCH.

As shown in FIGS. 3 and 4, the LCCH superframe of the self-employed system is a set of eight downlink intermittent transmissions of 150 mS, and one cycle is 1.2 seconds.

In the PHS, after the location registration is completed in the self-employed system, it waits in the reception state of the control channel. The PHS in the standby state shifts to the intermittent reception for receiving only the PCH corresponding to the incoming call group number (self incoming call group number).

In this case, the PCH corresponding to the incoming call group number
Exists in every LCCH superframe,
Intermittent reception for 1.2 seconds. In PHS, the power of the radio unit is turned on at the timing of every 1.2 seconds to receive PCH. At times other than this, turn off the power to the wireless unit,
A so-called battery saving operation is performed to prevent battery consumption.

The timing of power control of the PHS is shown in FIG. PCH1 and PCH2 in FIG. 5 indicate that the incoming call groups are different numbers (1) and (2).

On the other hand, in the LCCH superframe in the public system, as shown in FIG. 6, 12 downlink intermittent transmissions of 100 mS form one set. Therefore, one cycle is 1.
It consists of 2 seconds. The PHS incoming call group has two self-employed systems, whereas the public system has eight incoming call groups.

As shown in FIG. 7, the power control timing of the radio section in the PHS is set at 1.2 second intervals.

By the way, the timings of the public system and the self-employed system generally exist as independent systems. For this reason, the timing of the LCCH superframe depends on the clock precision of each other, and therefore the timing overlap actually occurs.

Here, P of the public system and the self-employed system
The timing at which CH is sent is as shown in FIG.

As shown in FIG. 8, the PCH of the public system
Transmission timing and PCH of 18CH self-employed system
12 of the self-employed system overlaps with the transmission timing of
The PCH of the CH may be in a state of timing approaching the PCH of the public system.

When the PHS is set to the mode of waiting for both systems at the same timing,
The PCH can be received only at the timing of either the public system or the self-employed system.

Therefore, if the PCH is received at the standby timing of the public system, even if the PCH from the private system is transmitted from the public system, it cannot be received at all. Conversely, at the standby timing of the private system, PCH is not received.
PC from public system when receiving CH
The problem occurs that H cannot be received at all.

The details of this timing are shown in FIG.

The standby timing of the 12CH PCH of the private system is 10 mS before the standby timing of the PCH of the public system, and the standby timing of the 18CH PCH is 5 mS later.

In order to stabilize the oscillation of the synthesizer and crystal oscillator of the internal radio section of the PHS, it is generally necessary to turn on the power of the radio section some time before the start of reception. In the case of the example in FIG. 9, the wireless unit is powered on 14 mS before the standby time, and the corresponding PCH reception operation is performed.

Therefore, in order to be able to receive at the timing of each PCH, it is necessary that the time interval between PCHs is 14 mS or more. If the PCH timings overlap within this range, reception becomes impossible.

In the case of FIG. 9, the PCH of the self-employed system is 12
When the standby operation is performed at the timing of CH or 18CH,
The public system PCH becomes unreceivable. On the contrary, if the standby operation is performed at the timing of the PCH of the public system, the PCH of the private system cannot be received.

Next, the operation of the mobile communication terminal system having such a configuration will be described.

First, when an incoming call event occurs in the private system, the incoming command sent from the main device such as an exchange is the line interface unit 1 of the private system in FIG.
It is received by the control unit 10 through the A.4. The control unit 10 detects the PCH of the public system detected by the signal detection unit 20 and compares it with the timing of the PCH of its own station.

As a result of this timing comparison, when the PCH timings of the public system and the self-employed system are within the permitted timing range, the control unit 10 normally sets 1.2.
The process of transmitting the PCH once in the second LCCH superframe is changed to the control of transmitting twice in the LCCH superframe.

As a result of this control change, as shown in FIG. 10, the PCH is transmitted to the fourth and eighth downlink intermittent transmissions. The position of the PCH is notified from the private system to the PHS by the control carrier configuration information element in the radio channel information notification message on the BCCH.

In PHS, based on this BCCH, PC
Change the timing of H reception. For this reason, the standby timing of the public system and the standby timing of the self-employed system are deviated to 1.2 seconds and 0.6 seconds, respectively, so that overlapping is avoided. Thereby, the PCH can be received normally.

Next, the control for changing the timing of sending the PCH in the private system will be described with reference to FIG.

First, when an incoming call event occurs in the self-employed system (step 20), the controller 10 of FIG. 1 searches for a PCH transmitted from the signal detector 20 in the public system (step 21). Next, the PCH transmission timing of the self-employed system is compared with the time interval (step 2).
2).

As a result of the comparison, if there is no timing overlap, PCH is transmitted by a normal self-employed system (step 25).

On the other hand, if the PCH standby timings coincide with each other, the incoming timing of the private system is set to the control timing of sending twice in 1.2 seconds (step 23). Also, BCC
The notification information element of H is set (step 24), 1.
A control carrier configuration information element indicating that the PCH is transmitted twice in 2 seconds is set.

As described above, in this embodiment, when the mobile communication terminal simultaneously receives and receives both the public system and the self-employed system, the self-managed system sends the data to the mobile communication terminal from the public system and the self-station. PCH
When the incoming information of the (paging channel) approaches or overlaps at the same timing, the control unit 10 controls the transmission timing of the PCH of its own station so as not to approach or overlap the PCH from the public system. Therefore, it is possible to prevent a poor incoming call due to the overlap of PCHs.

In the present embodiment, when the incoming information of the public system and the PCH (paging channel) sent from the mobile station to the mobile communication terminal approaches or overlaps at the same timing, the control unit 10 controls. Although the case has been described in which the PCH from the public system is changed so as not to be close to or overlap with the PCH by the control, the timing of the PCH on the public system side may be variably controlled. Also, the timing of CH12 and CH18 of the self-employed system may be changed.

Further, as shown in FIG.
A diversity method can also be adopted. That is, the two antennas 11 or 18 are connected to the antenna switching unit 17
It can be switched by a.

Further, as shown in FIG. 13, the antenna switching sections 17a and 17b can be interlocked with each other.

[0053]

As described above, according to the mobile communication terminal system and the standby method thereof according to the present invention, when the mobile communication terminal simultaneously receives and receives both the public system and the self-employed system, the mobile communication terminal is operated by the self-employed system. When the incoming information of the public system and the PCH (paging channel) sent from the local station is close to or overlaps at the same timing, the sending timing of the PCH of the local station is close to or overlaps with the PCH from the public system. Since the change is made so as not to occur, it is possible to prevent a poor incoming call due to the overlap of PCHs.

[Brief description of drawings]

FIG. 1 is a block diagram showing a self-employed system according to an embodiment of a mobile communication terminal system of the present invention.

FIG. 2 is a diagram showing timings of transmission and reception by a radio signal from a PHS in the self-employed system of FIG.

FIG. 3 is a diagram showing an LCCH superframe of the self-employed system of FIG. 1.

FIG. 4 is a diagram showing an LCCH superframe of the self-employed system of FIG. 1;

5 is a diagram for explaining the timing of PHS power supply control by the self-employed system of FIG. 1;

6 is a diagram showing an LCCH superframe of the self-employed system of FIG. 1;

FIG. 7 is a diagram for explaining the timing of power control of the wireless unit in the PHS.

FIG. 8 is a diagram for explaining overlapping and closeness of a PCH transmission timing of a public system and a PCH transmission timing of a private system.

FIG. 9 is a diagram for explaining standby timing of a public system and a self-employed system.

FIG. 10 is a diagram for explaining PHS standby timing by the control unit of FIG. 1;

FIG. 11 is a flowchart for explaining control for changing the timing of sending PCH in the private system of FIG.

FIG. 12 is a block diagram showing another embodiment in which the configuration of the self-employed system of FIG. 1 is changed.

13 is a block diagram showing another embodiment in which the configuration of the self-employed system of FIG. 1 is changed.

[Explanation of symbols]

10 Control unit 11 Antenna (# 1) 12 Received signal amplifier 13 Demodulator 14 line interface section 15 Modulator 16 Transmission signal amplifier 17, 17a, 17b Antenna switching unit 18 antennas (# 2) 19 Received signal amplifier 20 signal detector RXD, TXD audio data

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04B ^7/ 24-7/26 H04Q ⁷ /00-7/38

Claims (6)

(57) [Claims] 1. A mobile communication terminal system for simultaneously waiting and receiving both a public system and a private system by a mobile communication terminal, wherein the private system is transmitted from the public system and its own station to the mobile communication terminal. When the incoming information of the PCH (paging channel) of the above is close to or overlaps at the same timing, the transmission timing of the PCH of the own station is set to the LCCH
Before from the public system without changing the structure of the frame
A portable communication terminal system, characterized in that the transmission timing of PCH is set every 1/2 . 2. A mobile communication terminal is used to communicate with a public system.
A mobile communication terminal that simultaneously receives and receives both the operating system and
End system before the self-employed system is sent to the mobile communication terminal
PCH from the public system and own station
If the incoming call information in (1) is close or overlaps at the same timing,
When the PCH transmission timing of the local station is
If not close to or in proximity to the PCH from the stem
The self-employed system transmits and receives a first wireless signal to and from the mobile communication terminal.
Antenna, a demodulation unit for demodulating the first radio signal into a baseband signal, a line interface unit for transmitting the demodulated voice data to the main device, and a multiplexed data signal A modulator and a second receiver for receiving a second wireless signal from the public system
Antenna, a signal detection unit for detecting the PCH included in the LCCH (downlink logical control channel) from the second radio signal, the transmission timing of the PCH transmitted from the public system, and the PCH from the own station. When the transmission timings of both PCHs are close to or overlap with each other, the transmission timing of the PCH of the own station is set to ½ of the transmission timing of the PCH of the public system. A mobile communication terminal system comprising: 3. The mobile communication terminal, wherein the control unit provides position information of the PCH, control carrier configuration information indicating the number of broadcasts, and a transmission interval from a BCCH (broadcast channel) included in the LCCH (downlink logical control channel). The mobile communication terminal based on the BCCH.
The mobile communication terminal system according to claim 2, wherein the reception timing of H is changed. 4. A standby method of a mobile communication terminal system, wherein a mobile communication terminal simultaneously receives and receives both a public system and a self-employed system, the PCH being sent to the mobile communication terminal from the public system and the self-employed system. The first step of comparing the transmission timing of the incoming call information of the (paging channel), and, as a result of the comparison, when the PCHs approach or overlap at the same timing, the transmission timing of the PCH of the own station is set to L
The public system without changing the structure of the CCH frame
And a second step of setting the transmission timing of the PCH from [1] to [1/2] . 5. A mobile communication terminal is used to communicate with a public system.
A mobile communication terminal that simultaneously receives and receives both the operating system and
End system, which is a standby method of the public system and the self system transmitted to the mobile communication terminal.
PCH (paging call channel) incoming information from the operating system
As a result of the comparison with the first step of comparing the information transmission timings , the PCHs come close to each other or overlap at the same timing.
If it becomes, the transmission timing of the PCH of the own station
Keep away from the PCH from the public system
And a second step of changing so that they do not overlap, and in the first and second steps, a third wireless signal is transmitted and received to and from the mobile communication terminal.
A fourth step of demodulating the first radio signal into a baseband signal, a fifth step of sending the demodulated voice data to a main device, and a multiplexed data signal And a sixth step of receiving a second wireless signal from the public system.
Step, an eighth step of detecting the PCH included in the LCCH (downlink logical control channel) from the second radio signal, transmission timing of the PCH transmitted from the public system, and the transmission from the own station The transmission timing of the PCH is compared, and when the transmission timings of both PCHs are close to or overlap with each other, the transmission timing of the PCH of the own station is set to every 1/2 of the transmission timing of the PCH of the public system. The method for standby of a mobile communication terminal system, comprising: 6. In the ninth step, position information of the PCH, control carrier configuration information indicating the number of broadcasts and a transmission interval from the BCCH (broadcast channel) included in the LCCH (downlink logical control channel) are provided. The standby method of the mobile communication terminal system according to claim 5, further comprising a step of notifying the mobile communication terminal and changing a timing of receiving the PCH of the mobile communication terminal.