JP3130786B2 - Mobile phone system - 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 telephone system such as a PHS, and more particularly to a logical control channel (L).
CCH) transmission / reception control.

[0002]

2. Description of the Related Art In a conventional portable telephone system, a plurality of logical control channels (LCs) are used by using two or more carriers.
CH: Logical Control Channel). For example, the second generation cordless telephone system standard (RCR) defined by the Radio System Development Center
STD-28) shows an uplink LCCH position in a case where two LCCHs are used by using two control carriers for a private system as follows.

(1) Uplink slot on the currently used carrier 2.5 ms after the currently used downlink LCCH (see FIG. 5).

[0004] (2) T on the currently used carrier 2.5 ms after the currently used downlink LCCH
DMA (Time Division Multiple Access) frame (5
ms) is defined as a first TDMA frame, and the first TD
Odd-numbered TDMA frames allocated from the MA frame allocate the corresponding carrier, and even-numbered TDMA frames allocate the other carrier. Uplink LCCH specified
Is an uplink slot for every 2 TDMA frames (10 ms) corresponding to the above allocation on the TDMA frame in each carrier. However, the LCCH interval value (25 or more for private use) must be an even number (see FIG. 7).

[0005] Further, assuming that the frequencies of the two control carriers are f ₁ and f ₂ , the standard configuration of the downlink LCCH is shown as follows.

(1) When the incoming groups of the PCH (Paging Channel) are independent: The incoming groups of the PCH of the control carriers f ₁ and f ₂ are mutually independent, but each downlink LCCH superframe configuration is the same. (See FIG. 8).

[0007] (2) If the incoming group of PCH are interrelated: perform incoming odd group in PCH of the control carrier f _1, performs an incoming call even number group in f ₂ (see FIG. 9).

[0008] Since these are known, detailed description is omitted.

Here, in the conventional portable telephone system, when two LCCHs using two control carriers of frequencies f ₁ and f ₂ are used, a downlink LCCH on the control carrier of frequency f ₁ is used. consider the case where the interval between the downlink LCCH on the control carrier of frequency f ₂ is thereby constituting a so downlink LCCH an odd number of TDMA frames, is constructed as an uplink LCCH mentioned above (2).

In this case, the timing of transmitting and receiving the LCCH in the base station is as shown in FIGS. 9 (a) and 9 (b). FIG. 3A shows that the downlink LCCH transmission on the control carrier of frequency f ₁ is started at time t ₁ and then the downlink LCCH on frequency f ₂ of the control carrier is started at time t ₂ .
The transmission / reception status up to the end of transmission is shown. Further, FIG. (B) from the start of the downlink LCCH transmission onto the control carrier of frequency f ₂ at time t _3, at time t ₄ the downlink LCCH transmission onto the control carrier frequency f ₁ This shows the transmission / reception status up to the end.

[0011] As is apparent from FIG. (A), the time t ₁
Time to time t ₂ from, 5 × n ₁ to n ₁ is an odd number
[Ms]. Also, as is clear from FIG.
Time from time t ₃ to time t ₄ is, 5 × n as n ₁ or more even number (n-n ₁₎ becomes [ms]. That is, the transmission start interval of the downlink LCCH on each of the control carriers of the frequencies f ₁ and f ₂ is 5 × n [ms].

Further, in this case, the base station transmits the control signal on the control carrier of frequency f ₁ every 10 ms from 2.5 ms after the time t ₁ at which the downlink LCCH transmission on the control carrier of frequency f ₁ is started. The uplink slot is received. Similarly, the base station sets 10 ms from 2.5 ms after time t _{3 when} downlink LCCH transmission on the control carrier of frequency f ₂ is started.
per ms, to receive the uplink slot on the control carrier of frequency f _2. That is, since n ₁ is an odd number, reception of an uplink slot on the control carrier of frequency f ₁ and reception of an uplink slot on the control carrier of frequency f ₂ are 5 times.
This is performed alternately every ms.

[0013]

However, the above-described LCCH configuration has the following problems. That is,
As is clear from FIGS. 9A and 9B, the base station transmits the uplink L on one control carrier of two types of frequencies.
4.375 ms after the end of the reception of the CCH, the reception of the uplink LCCH on the control carrier of the other frequency must be started. Also, transmission of the downlink LCCH on one control carrier of the two frequencies must start 1.875 ms after transmission of the uplink LCCH on the other control carrier ends.

In general, a base station of a conventional portable telephone system controls the frequency of a local oscillation signal for transmission and reception using one frequency synthesizer, and performs software processing after reception is completed within the above time. (Including the execution of the frequency switching command) and the frequency switching of the local oscillation signal output by the frequency synthesizer must be completed, and the reception or transmission frequency must be switched. For this reason, there is a problem in that a burden is imposed on software and a high-priced frequency synthesizer with a high frequency switching speed is required.

[0015]

According to a first aspect of the present invention, there is provided a portable telephone system comprising a base station and a mobile station each having transmission / reception means for transmitting / receiving a radio signal. In a mobile telephone system for transmitting and receiving a logical control channel between a transmitting and receiving means of a base station and a mobile station by using a control carrier allocated to a plurality of frequency bands, the transmitting and receiving means is provided for each of the base station and the mobile station. Frequency setting means for setting the frequency band of the control carrier used in any one of the plurality of frequency bands, and control means for controlling a transmission / reception operation of the transmission / reception means and a frequency switching operation of the frequency setting means. Whether the control means of the base station starts transmission of the downlink logical control channel using a control carrier in a certain frequency band In the period before starting transmission of the downlink logical control channel using the control carrier of another frequency band, the base station receives the uplink logical control channel only on the control carrier of the certain frequency band, The transmitting / receiving means and the frequency setting means control the transmitting / receiving means and the frequency setting means so that the control means of the mobile station transmits the uplink logical control channel only on the control carrier in the certain frequency band during the period. It is characterized by controlling the means.

According to the first aspect of the present invention, after the downlink logical control channel is transmitted from the base station side to the mobile station side (downlink direction) using a control carrier of a certain frequency, the downlink logical control channel is transmitted. The received mobile station transmits the uplink logical control channel to the base station via the control carrier of the frequency band used when transmitting the downlink logical control channel. That is, the frequency setting means of the base station,
Once a certain frequency band is selected and set as a control carrier for transmitting the downlink logical control channel, it is not necessary to perform the frequency switching operation until the next transmission of the downlink logical control channel. Similarly, once the mobile station frequency setting unit receives the downlink logical control channel via the control carrier of a certain frequency band, the downlink logical control channel via the control carrier of another frequency band is also used. Until the transmission, there is no need to perform the frequency switching operation. As a result, the frequency of the switching operation of the frequency setting means of the base station and the mobile station becomes lower than before,
The switching speed required for the frequency setting means may be lower than before. As the frequency setting means, for example, a member such as a frequency synthesizer can be applied.However, the required frequency switching speed becomes lower than before, so that the selection range of the members applicable as the frequency setting means can be expanded. As a result, a mobile phone system can be provided at lower cost. Another advantage is that the load on the control means for controlling the frequency switching operation of the frequency setting means can be reduced.

According to a second aspect of the present invention, in the mobile phone system according to the first aspect, a first control carrier and a second control carrier assigned to different frequency bands are used as the control carriers. ,
In the base station, the time from the start of transmission of the downlink logical control channel to the first control carrier to the start of transmission of the downlink logical control channel to the second control carrier is 5n ₁ [ms].
(Where n ₁ is an odd number), the time from the start of transmission of the downlink logical control channel by the second control carrier to the start of transmission of the downlink logical control channel by the first control carrier is 5
(N−n ₁ ) [ms] (where n is an even number greater than n ₁ ), and in the section of 5n ₁ [ms], the uplink logical control channel from the first control carrier is further transmitted. Reception is performed (n ₁ -1) times at intervals of 5 [ms].
In the section of (n-n ₁ ) [ms], the base station transmits the uplink logical control channel from the second control carrier (n-n ₁ -1) times at intervals of 5 [ms]. The control means controls the transmission / reception means and the frequency setting means of the base station, and when the mobile station receives a downlink logical control channel via the first control carrier, the mobile station transmits the signal to the first control carrier. Transmission of the logical control channel,
When the base station receives an uplink logical control channel from the first control carrier at an arbitrary timing and receives a downlink logical control channel via the second control carrier, the second control carrier The control means of the mobile station transmits and receives the uplink logical control channel to the mobile station so that the base station arbitrarily transmits the uplink logical control channel at the timing when the base station receives the uplink logical control channel from the second control carrier. And frequency control means.

According to the configuration of the second aspect, if the time from the start of transmission of the downlink logical control channel to the start of reception of the uplink logical control channel is 2.5 [ms], for example, the first (N ₁ -1) in control carrier
The time from the end of the reception of the second uplink logical control channel to the start of transmission of the downlink logical control channel to the second control carrier is 6.875 [ms], and similarly, (n−n) in the second control carrier. ₁ -1) th reception end of the uplink logical control channel, the time of transmission until the start of the downlink logical control channel to the first control carrier is 6.875 [m
s].

That is, at the base station, this 6.875
Since the frequency setting means only needs to end the frequency switching operation during [ms], the frequency switching speed required for the frequency setting means may be lower than in the related art. As a result, the selection range of members applicable as the frequency setting means can be expanded, so that a mobile phone system can be provided at lower cost. Another advantage is that the load on the control means for controlling the frequency switching operation of the frequency setting means can be reduced.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. A mobile phone system according to one embodiment of the present invention includes a base station and a mobile station that performs wireless communication while moving within a service area of the base station.

Since the above-mentioned mobile telephone system has a different feature from the conventional configuration regarding transmission and reception of a logical control channel (LCCH: Logical Control CHannel) used in the link channel establishment phase, A configuration related to transmission and reception of the LCCH and a control procedure thereof will be mainly described.

FIGS. 1A and 1B are block diagrams showing a schematic configuration of a control system of the base station and the mobile station. First, the configuration of the mobile station and the outline of the operation of each unit will be described with reference to FIG. The mobile station includes an antenna 11, an RF (Radio-Frequency) switch 12, a frequency synthesizer 13 for outputting a local oscillation signal, mixers 14 and 16, band filters 15 and 17, a control unit 18, and a mobile station main unit 19. I have.

The mobile station main unit 19 comprises a voice codec unit, a TDMA synchronization control circuit, an A / D converter, a D / A converter, a modulator, a demodulator and the like (all not shown). It performs various processes such as creation of control information to be transmitted and voice encoding and modulation / demodulation for transmitting and receiving voice and data.

The control unit 18 switches the frequency of the local oscillation signal output from the frequency synthesizer 13 and controls the mobile station main unit 19 to control the transmission / reception timing of the LCCH.

The uplink LCCH signal output from the mobile station is output as an intermediate frequency signal from the mobile station main unit 19, mixed with a local oscillation signal output from the frequency synthesizer 13 in the mixer 16, After being converted into a signal, the RF switch 12
Is transmitted from the antenna 11 via the.

Although the frequency of the intermediate frequency signal output from the main part 19 of the mobile station is constant, the control part 18 switches the frequency of the local oscillation signal output from the frequency synthesizer 13 to output the signal from the mobile station. Uplink LCCH
Of the control carrier is switched. In the present embodiment, a control carrier frequency f _1, and intended to control the carrier frequency f ₂ is used.

Also, the downlink LCCH transmitted from the base station
Is input to the mixer 14 via the antenna 11 and the RF switch 12 on the mobile station side, is mixed with the local oscillation signal output from the frequency synthesizer 13 in the mixer 14, The signal is converted into a signal and input to the mobile station main unit 19. The frequency of the intermediate frequency signal input to the mobile station main unit 19 is controlled by the control unit 1
8, the frequency of the local oscillation signal output from the frequency synthesizer 13 is switched,
It is constant regardless of the frequency of the control carrier of the CH.

Next, the configuration of the base station and the outline of the operation of each section will be described with reference to FIG. The base station includes an antenna 21, an RF switch 22, a frequency synthesizer 23 for outputting a local oscillation signal, and mixers 24.2.
6, a band filter 25/27, a control unit 28, and a base station main unit 29.

The base station main unit 29 includes a voice codec unit, a TDMA synchronization control circuit, an A / D converter, a D / A converter, a modulator, a demodulator and the like (all not shown). It performs various processes such as creation of control information to be transmitted and voice encoding and modulation / demodulation for transmitting and receiving voice and data.

The control unit 28 switches the frequency of the local oscillation signal output from the frequency synthesizer 23 and controls the base station main unit 29 to control the transmission / reception timing of the LCCH.

The downlink LCCH signal output from the base station is output as an intermediate frequency signal from the base station main unit 29, mixed with a local oscillation signal output from the frequency synthesizer 23 in the mixer 26, After being converted to a signal, the RF switch 22
Is transmitted from the antenna 21 via.

The frequency of the intermediate frequency signal output from the base station main section 29 is constant, but the control section 28 switches the frequency of the local oscillation signal output from the frequency synthesizer 23, so that the base station outputs the signal. Downlink LCCH
Of the control carrier is switched.

The uplink LCCH transmitted from the mobile station
Is input to a mixer 24 via an antenna 21 and an RF switch 22, mixed with a local oscillation signal output from a frequency synthesizer 23 in the mixer 24, and further converted into an intermediate frequency signal by a bandpass filter 25. It is input to the base station main part 29.

The frequency of the intermediate frequency signal input to the base station main unit 29 is changed to the frequency of the control carrier for the uplink LCCH by switching the frequency of the local oscillation signal output from the frequency synthesizer 23 by the control unit 28. Regardless, it is constant.

Next, the control of the transmission / reception timing of the LCCH performed by the control unit 18 of the mobile station and the control unit 28 of the base station will be described with reference to FIGS. 2 (a) and 2 (b). As shown in FIG. 2 (a), in the base station, downlink LCCH on the control carrier frequency f ₁
The time from the start of transmission (time t ₁₁ ) to the start of transmission of downlink LCCH on the control carrier of frequency f ₂ (time t ₁₂ ) is 5 × n ₁ [ms] (where n ₁ is an odd number). To

Further, as shown in FIG.
_{From the} start of transmission of the downlink LCCH on the control carrier ₂ (time t ₁₃ ), the downlink LCCH on the control carrier of frequency f ₁
The time until the start of CH transmission (time t ₁₄ ) is set to 5 × (n−n ₁ ) [ms], where n is an even number equal to or greater than n ₁ . In this case, in the base station, the time interval between the start of transmission of the downlink LCCH on the control carrier of each of the frequencies f ₁ and f ₂ is 5 × n [ms].

[0037] In other words, the base station, the 5ms each after 2.5ms downlink LCCH transmission start on the control carrier frequency f _1, the reception of the uplink slot on the control carrier of frequency f ₁ (n ₁ -1) times, 5 times after _2.5 ms from the start of downlink LCCH transmission on the control carrier of frequency f2.
per ms, to receive the uplink slot on the control carrier frequency _{f 2 (n-n 1 -1} ) times.

On the other hand, the mobile station determines the frequencies f ₁ and f ₂
The downlink LCCH on any one of the control carriers is received, and the uplink LCCH is transmitted on the control carrier having the same frequency as the received downlink LCCH according to the reception timing of the base station.

By transmitting and receiving the LCCH between the base station and the mobile station at the timing as described above, the base station can transmit the downlink LCCH on the control carrier of frequency f ₁ .
6.875 ms before the start of transmission on the control carrier of frequency f ₂ , the reception of the uplink slot ends, and 6.875 before the start of transmission of the downlink LCCH on the control carrier of frequency f _2.
Before ms, so that the reception of the uplink slot on the control carrier of frequency f ₁ is completed.

That is, the frequency synthesizer 2 of the base station
In No. 3, since it is only necessary to switch the frequency during this 6.875 ms, a switching speed lower than that of the conventional configuration may be used. In general, the frequency synthesizer becomes more expensive as the switching speed becomes faster. According to the configuration of the present embodiment, it becomes possible to use a frequency synthesizer having a lower switching speed. This has the effect that it can be provided. Further, an effect that the control load on the control unit 28 is reduced is also provided.

Here, the control procedure executed by the control unit 28 of the base station to realize the LCCH transmission / reception timing shown in FIGS. 2A and 2B will be described with reference to the flowchart of FIG. I do.

The control unit 28 first sets the frequency synthesizer 23 so that transmission and reception at the frequency f ₁ can be performed (Step 1, hereinafter referred to as S1). In addition,
At the same time, the control unit 28 resets a counter for counting the number of times the uplink LCCH has been received.

Next, the control unit 28 controls the base station main unit 29 to transmit the downlink LCC on the control carrier of frequency f _1.
H is transmitted (S2). Then, wait for the 1.875ms elapsed from the downstream LCCH transmission end (S3), and controls the base station main unit 29, to receive the uplink LCCH on the control carrier of frequency f ₁ (S4). In addition, the value of the above-mentioned counter is increased by 1 together with the reception of the uplink LCCH in S4.

Next, based on the value of the counter, the up LCCH reception on the carrier it is determined whether the (n ₁ -1) th (S5), not the (n ₁ -1) th (NO in S5), 4.375 from reception of uplink LCCH
Wait for elapse of ms (S6), return to S4 and go up LCC
H is received.

On the other hand, if the uplink LCCH received (n ₁ -1) th (YES in S5), the control unit 28, so that it can send and receive at the frequency f _2, sets the frequency synthesizer 23 (S7) . At the same time, the counter is reset by the control unit 28.

Further, the control unit 28 waits until 6.875 ms has elapsed from the end of the uplink LCCH reception in S4 immediately before (S8), and controls the base station main unit 29 to control the frequency f _2.
To transmit the downlink LCCH on the control carrier (S
9).

Further, it waits until 1.875 ms has elapsed from the end of the transmission of the downlink LCCH in S9 (S10), and receives the uplink LCCH on the control carrier (S11). In S11, the value of the counter is increased by one.

Next, the control unit 28, based on the value of the counter, controls the uplink LCC on the control carrier of frequency f _2.
H received it is determined whether the (n-n ₁ -1) th (S12), if not round _{(1 -1 n-n) (} S12
NO), wait until 4.375 ms has elapsed from the reception of the uplink LCCH (S13), and return to S11 to receive the uplink LCCH.

On the other hand, when the uplink LCCH reception is (n−n ₁ −
If 1) th and (YES in S12), to transmit and receive at the frequency f _1, setting the frequency synthesizer 23 (S14). At this time, the above-described counter is reset by the control unit 28 at the same time. Then, immediately before S
Wait until 6.875 ms has elapsed from the end of the uplink LCCH reception in S11 (S15), and return to S2 to download the downlink LCCH.
Send The control unit 28 of the base station repeats the above processing. Thereby, the LCCH transmission / reception timing shown in FIGS. 2A and 2B is realized.

Next, a control procedure performed by the control unit 18 of the mobile station will be described with reference to the flowchart of FIG. Here, the downlink LCCH is transmitted from the base station to the mobile station on the control carrier of frequency f ₁ , and the mobile station transmits and receives the LCCH using the control carrier of frequency f _1. Shall be

The control unit 18 first, so that it can transmit and receive at the frequency f _1, to set the frequency synthesizer 13 (S2
1), receives the downlink LCCH on the control carrier of frequency f ₁ (S22). 1.8 from reception of downlink LCCH
It waits until 75 ms has elapsed (S23), and determines whether to transmit an uplink LCCH (S24).

If the uplink LCCH is not transmitted (S24
NO at S27), and waits until 5 ms elapses. On the other hand, when transmitting the uplink LCCH (S24
, YES), and the signal L rises on the control carrier of frequency f _1.
The CCH is transmitted (S25), and then waits until 4.375 ms has elapsed (S26).

Next, it is determined whether (5 × n ₁ −2.5) ms has elapsed since the start of the downlink LCCH reception in S22 (S28). If it has not passed (S2
8) and returns to S24 to determine whether or not to transmit an uplink LCCH. On the other hand, if the result of the determination in S28 is YES, it waits for (5 × n ₁ +2.5) ms to elapse (S
29) Return to S22 and receive the downlink LCCH. The control unit 18 of the mobile station repeatedly performs the above processing, so that the base station performs the LCC as shown in FIG.
H transmission / reception timing is realized.

As described above, in the mobile phone system of the present embodiment, the frequency switching frequency at the base station and the mobile station is reduced as compared with the conventional one, and the frequency switching speed may be lower than before. The system can be configured using a low-cost frequency synthesizer. As a result, it is possible to provide a mobile phone system at a lower cost than before.

[0055]

As described above, according to the portable telephone system of the first aspect of the present invention, each of the base station and the mobile station sets the frequency band of the control carrier used by the transmitting / receiving means to any one of the plurality of frequency bands. Frequency setting means for setting the frequency, and control means for controlling the transmission / reception operation of the transmission / reception means and the frequency switching operation of the frequency setting means are provided, and the control means of the base station sets a control carrier in a certain frequency band. From the start of the transmission of the downlink logical control channel using, until the start of the transmission of the downlink logical control channel using the control carrier of another frequency band, only on the control carrier of a certain frequency band The transmitting and receiving means of the base station and the frequency setting means are controlled so as to receive the uplink logical control channel, and the control means of the mobile station performs There are, to transmit only the uplink logical control channel on the control carrier of the certain frequency band, a configuration for controlling the transmission and reception means and the frequency setting means of the mobile station.

As a result, the switching speed required for the frequency setting means of the base station and the mobile station may be lower than before, and the selection range of members applicable as the frequency setting means can be expanded, so that the cost can be reduced. The mobile phone system can be provided. Further, there is an effect that the load on the control means for controlling the frequency switching operation of the frequency setting means can be reduced.

The mobile telephone system according to the second aspect of the present invention uses a first control carrier and a second control carrier allocated to different frequency bands as control carriers, and the base station uses the first control carrier. The time from the start of the transmission of the downlink logical control channel to the carrier to the start of the transmission of the downlink logical control channel to the second control carrier is 5n ₁ [ms] (where n ₁ is an odd number), and the downlink by the second control carrier. time from the transmission start to the start of transmission of the downlink logical control channel by the first control carrier of the logical control channel 5 (n-n ₁₎ [ms] (where, n is greater even number than n ₁₎ as a And the above 5n ₁
In the [ms] interval, the reception of the uplink logical control channel from the first control carrier is performed (n ₁ -1) times at intervals of 5 [ms], and in the interval of 5 (n-n ₁ ) [ms]. The reception of the uplink logical control channel from the second control carrier is set to 5
To perform [ms] intervals (n-n ₁ -1) times, the control means of the base station controls the transmission and reception means and the frequency setting means of the base station, the mobile station, the first control carrier When the base station receives the downlink logical control channel from the first control carrier, the base station transmits the uplink logical control channel to the first control carrier. Optionally, when the downlink logical control channel is received via the second control carrier, the base station transmits the uplink logical control channel to the second control carrier.
The control means of the mobile station controls the transmission / reception means and the frequency setting means of the mobile station so that the control is performed arbitrarily at the timing of receiving the uplink logical control channel from the control carrier.

Thus, the frequency switching speed required for the frequency setting means may be low, and the selection range of the members applicable as the frequency setting means can be expanded. As a result, it is possible to provide a mobile phone system at a lower cost. Further, there is an effect that the load on the control means for controlling the frequency switching operation of the frequency setting means can be reduced.

[Brief description of the drawings]

FIG. 1A is a block diagram showing a schematic configuration of a mobile station of a mobile phone system according to an embodiment of the present invention;
FIG. 1B is a block diagram showing a schematic configuration of a base station of the mobile phone system.

FIG. 2 shows the timing of transmission and reception of LCCH in the base station. FIG. 2A shows the transmission of a downlink LCCH on a control carrier of frequency f ₁ , and
Explanatory view showing a LCCH transmission and reception status in the section before sending a downlink LCCH on ₂ of the control carrier, FIG. (B) is down on the control carrier of frequency f ₂ LCC
FIG. 7 is an explanatory diagram showing an LCCH transmission / reception state in a section from transmission of H to transmission of a downlink LCCH on a control carrier of frequency f ₁ .

FIG. 3 is a flowchart showing a control procedure performed by a control unit of the base station for transmission and reception of an LCCH.

FIG. 4 is a flowchart showing a procedure of control performed by a control unit of the mobile station when the frequency is set to f ₁ for LCCH transmission / reception.

FIG. 5 shows a standard used in the second generation digital cordless telephone system standard (RCR STD-28) as an uplink LCCH when two LCCHs are used using two control carriers in a private system. It is an explanatory view showing an example of a simple structure.

FIG. 6 shows a standard used in the second generation digital cordless telephone system standard (RCR STD-28) as an uplink LCCH when two LCCHs are used using two control carriers in a private system. It is an explanatory view showing another example of a simple structure.

FIG. 7 shows a standard used in a second generation digital cordless telephone system standard (RCR STD-28) as a downlink LCCH when two LCCHs are used using two control carriers in a private system. It is an explanatory view showing an example of a simple structure.

FIG. 8 shows a standard used in a second generation digital cordless telephone system standard (RCR STD-28) as a downlink LCCH when two LCCHs are used using two control carriers in a private system. It is an explanatory view showing another example of a simple structure.

[9] Two conventional mobile phone system when using LCCH, and shows the LCCH transmission and reception timings at the base station, FIG. (A) is a downlink LCCH on the control carrier frequency f ₁ After transmission, the frequency f
Explanatory view showing a LCCH transmission and reception status in the section before sending a downlink LCCH on ₂ of the control carrier, FIG. (B) is down on the control carrier of frequency f ₂ LCC
FIG. 7 is an explanatory diagram showing an LCCH transmission / reception state in a section from transmission of H to transmission of a downlink LCCH on a control carrier of frequency f ₁ .

[Explanation of symbols]

 13.23 Frequency synthesizer (frequency setting means) 18.28 control unit (control means) 19 Main part of mobile station (transmission / reception means) 29 Main part of base station (transmission / reception means)

Claims (2)

(57) [Claims] 1. A base station and a mobile station each provided with a transmitting / receiving means for transmitting / receiving a radio signal, and a control carrier allocated to a plurality of frequency bands between the transmitting / receiving means of the base station and the mobile station. In a mobile telephone system for transmitting and receiving a logical control channel, a frequency setting means for setting a frequency band of a control carrier used by the transmitting / receiving means to any of the plurality of frequency bands for each of a base station and a mobile station. And control means for controlling the transmission / reception operation of the transmission / reception means and the frequency switching operation of the frequency setting means, and the control means of the base station controls the downlink logical control channel using a control carrier of a certain frequency band. After you start sending,
During a period before the transmission of the downlink logical control channel using the control carrier of another frequency band is started, the transmission and reception of the base station are performed so that the uplink logical control channel only on the control carrier of the certain frequency band is received. Transmitting and receiving means and frequency setting means of the mobile station so that the control means of the mobile station transmits the uplink logical control channel only on the control carrier of the certain frequency band during the period. Controlling the mobile phone system. 2. A base station transmits a downlink logical control channel to a first control carrier using a first control carrier and a second control carrier assigned to different frequency bands as the control carrier. Time from the start to the start of transmission of the downlink logical control channel to the second control carrier is 5n ₁ [ms]
(Where n ₁ is an odd number), the time from the start of transmission of the downlink logical control channel by the second control carrier to the start of transmission of the downlink logical control channel by the first control carrier is 5
(N−n ₁ ) [ms] (where n is an even number greater than n ₁ ), and in the section of 5n ₁ [ms], the uplink logical control channel from the first control carrier is further transmitted. Reception is performed (n ₁ -1) times at intervals of 5 [ms].
In the section of (n-n ₁ ) [ms], the base station transmits the uplink logical control channel from the second control carrier (n-n ₁ -1) times at intervals of 5 [ms]. The control means controls the transmission / reception means and the frequency setting means of the base station, and when the mobile station receives a downlink logical control channel via the first control carrier, the mobile station receives an uplink to the first control carrier. When the base station arbitrarily performs transmission of the logical control channel at the timing when the base station receives the uplink logical control channel from the first control carrier and receives the downlink logical control channel via the second control carrier, Transmitting the uplink logical control channel to the second control carrier at any time when the base station receives the uplink logical control channel from the second control carrier, Mobile telephone system according to claim 1, wherein the control means of the serial mobile station and controls the transmission and reception means and the frequency setting means of the mobile station.