JPH06216833A - Mobile communication system - Google Patents

Abstract

PURPOSE:To reduce the power consumption in a wait mode and to prolong the life of a battery by intermittently receiving an incoming information on its own station in the wait mode, performing the outgoing and incoming with the information on an existing base station, and otherwise inhibiting the decision of an existing zone. CONSTITUTION:Plural radio base stations transmit the signals of calling control channels to a mobile station. The control part 7 of the mobile station selects a radio base station for communication. Then the part 7 (ROM 73) intermittently receives the incoming information corresponding to the incoming group of its own station in a wait mode. Furthermore the part 7 compares the reception levels of time slots of all radio base stations with each other by an incoming request given to the mobile station in an incoming state and by an outgoing request of the mobile station user respectively for decision of an existing radio zone. Thus the outgoing/incoming operations are carried out based on the information on the existing radio base station. Otherwise the decision of the existing radio zone is inhibited.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a mobile localized zone selection system of a mobile communication system. It will be used for the mobile localized zone selection method of the car telephone system. In particular, it relates to the in-zone selection method when the mobile station is on standby.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram of a wireless zone of a mobile communication system. FIG. 6 is a diagram showing a signal configuration of a paging control channel of the mobile communication system.

In FIG. 5, for example, in the case of an automobile telephone system, N radio base stations Rm (m are provided in one control zone as a service area for automobile telephone services.
= 1 to N), and the control zone is composed of a collection of radio zones belonging to each radio base station Rm. Each radio base station Rm is connected to the common radio control station 1 by a fixed transmission path.

The radio control station 1 is connected to a general telephone line network via a mobile station (automobile) switching station (not shown). Further, the size of the radio zone belonging to each radio base station Rm is determined to be a size that enables sufficient communication between the mobile station and the corresponding radio base station due to the transmission power of the mobile stations in the zone. ing.

FIG. 6 shows a signal structure of a paging control channel.
It is a figure which shows only a frame.

In FIG. 6, the signal structure is such that time slots P _i (i) which N radio base stations R1 to RN transmit at the same time.
= 0 to m, where m is a natural number) and N time slots (hereinafter referred to as MBS time slots) Bk (k = 1 to N) that are sequentially transmitted by each radio base station R individually to form one frame. , Such a frame is continuously repeated (hereinafter referred to as multi-station simultaneous and individual sequential transmission).

The information of the time slot Pi is called incoming information, and each radio base station calls the mobile station at the same time in order to know whether or not there is a mobile station in the control zone. It is divided into 0 group to m group. The information of the MBR time slot Bk is MBS (Mo
It is called “bil base station” information, and broadcasts data used by a mobile station peculiar to the radio base station when making or receiving a call.

A mobile station located in the control zone and receiving such a paging control channel detects the reception level of each MBS time slot, and if the reception level of each MBS time slot exceeds a certain value. By finding the maximum one, it is possible to know which wireless zone Zp (p is an integer of 1 or more and N or less).

In order to reduce the power consumption of the mobile station while waiting for an incoming call, the mobile station adopts an intermittent receiving method of receiving only the incoming call information of its own group among the incoming call information. Conventionally, an M that has been in the sphere and needs such discontinuous reception
In the system where the BS information has to be selected, the mobile station selects the MBS when selecting the control zone, and then only the MBS time lot is combined with the intermittent reception of the incoming information, and the reception level of the MBS time slot exists. It is within a certain value, or there is a difference between the incoming information (the time slot in which all wireless base stations in the control zone are transmitting at the same time) and the receiving level of the existing wireless zone. It recognizes that the existing wireless zone has changed, and again performs a wireless base station selection operation (hereinafter referred to as an MBS selection operation) that compares the reception levels of all MBS time slots to select the correct in-zone. Is going.

To increase the subscriber capacity of the system,
The size of the wireless zone must be reduced to increase the repetition of the same geographical frequency. In such a system in which the wireless zone becomes smaller, the mobile station performing the intermittent reception that monitors the transition of the wireless zone in the standby state described above frequently moves to the MBS by moving.
Since the selection operation is repeated, the intermittent reception is frequently stopped and the continuous reception must be performed.

[0011]

However, in such a conventional mobile communication system, when the wireless zone is made small in order to increase the subscriber capacity of the system, the mobile station in the standby state is required to move. As a result, the MBS selection operation is frequently repeated, and intermittent reception is frequently stopped and continuous reception must be performed, resulting in high power consumption and drastically shortening the battery usage time of the portable device.

The present invention solves the above-mentioned drawbacks, and an object of the present invention is to provide a mobile communication system capable of saving current consumption during standby and prolonging battery use time and ensuring reliable connection control. .

[0013]

According to the present invention, an N radio base station having an integer of 1 or more and a large number of mobile stations are provided, and the N radio zones covered by the N radio base stations are equal to each other. Forming two control zones, each radio base station includes means for transmitting a paging control channel signal (P + B) to the mobile station, wherein the mobile station is The signal of the paging control channel is provided with control means including a location zone determination means for selecting a radio base station to communicate with, and all the radio base stations simultaneously group incoming call information corresponding to the incoming call group of the mobile station. A shared time slot (P1 to Pm) for sequentially transmitting, and a time slot (B1) for N radio base stations in which each of the radio base stations sequentially transmits radio base station information unique to the station. ~ BN) In the mobile communication system described above, the control means is based on a means for intermittently receiving incoming call information corresponding to an incoming call group to which the own station belongs during standby, and an activation request or an incoming call request for activation of the existing zone determination means. Other than the above, it is characterized by including prohibition means.

Further, according to the present invention, the control means performs a calling operation via a transmission control channel based on the wireless base station information of the existing zone after the wireless zone determination at the time of transmission, and a call after the wireless zone determination at the time of incoming. Means for performing an incoming call response operation via the control channel or the outgoing control channel can be included.

[0015]

In the standby mode, the mobile station intermittently receives the incoming call information (only one of P1 to Pm) of the incoming call group to which the local station belongs on the paging control channel. Occasionally, when the mobile station receives an incoming call request, it compares the reception levels of the time slots for all wireless base stations to determine the wireless zone in which it is located, and then performs the incoming / outgoing operation based on the information of the existing wireless base station. In addition to this, by not performing the determination of the in-zone, the current consumption can be reduced and the battery usage time can be lengthened during standby.

[0016]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a mobile station of a mobile communication system according to an embodiment of the present invention.

In FIG. 1, the mobile communication system comprises N radio base stations R1 to RN, which are integers of 1 or more, and a large number of mobile stations M. N radio base stations R1 to RN cover N radio base stations R1 to RN. Wireless zones forming one control zone, each radio base station R includes means for transmitting a signal (P + B) of the paging control channel to the mobile station M, and the mobile station M is the signal of the paging control channel. The mobile station M includes a control unit 7 as a control unit including (as a part of the ROM 73) serving as a located zone determination unit that selects a radio base station with which the mobile station M should communicate. Shared time slots P1 to Pm in which the base station R simultaneously transmits the incoming call information corresponding to the incoming call group of the mobile station M for each group, and each radio base station R
Is a time slot for N radio base stations (hereinafter referred to as MBS time slots) for sequentially transmitting MBS information as radio base station information unique to that station for each station.
It is configured by repeating with N. The mobile station M includes an antenna 2, a duplexer 3, a receiver 4, a transmitter 5, and a synthesizer 6, and the controller 7 includes an input / output unit 71 and a CPU.
(Central processing unit) 72, ROM (Read only memory)
73, RAM (random access memory), timer 75
And a clock generator 76.

A feature of the present invention is that the control unit 7 (ROM 73) intermittently receives incoming call information corresponding to an incoming call group to which the own station belongs during standby, and the in-zone determining unit. Means for prohibiting the activation of the device except based on the outgoing call request or the incoming call request.

Further, the control unit 7 (ROM 73) has means for performing a transmission operation via the transmission control channel (A-ch) based on the MBS information of the existing zone after the wireless zone determination at the time of transmission, and the wireless zone determination at the time of incoming. It includes means for later performing an incoming call response operation via the call control channel.

The operation of the mobile communication system having such a configuration will be described.

FIG. 2 is a diagram showing the signal structure of the paging control channel and the intermittent reception operation of the mobile communication system of the present invention. FIG. 3 is a flowchart showing the operation of the mobile communication system of the present invention.

In FIG. 1, many signal lines are actually input / output to / from the input / output unit 71, but here, only the reception data, the reception level, and the signal line of the power on / off pulse necessary for the description are described. There is.

The functional operation of the mobile station is determined by the program stored in the ROM 73. A program that realizes a flowchart shown in FIG. 3 to be described later is stored in the ROM 73. Further, as related to the description below, the reception level determined by the mobile station is set by the control unit 7 to the synthesizer unit 6 for the paging control channel (P) set between the mobile station and the radio base station. This is the reception level output from the reception unit 4 by specifying the channel number of (-ch). Further, for generation of timing depending on the data sequence of the paging control channel such as multi-station transmission partial level measurement and intermittent reception, the control unit 7 decodes the reception data output from the reception unit 4 to set the timer 75. Start and generate.

FIG. 2 shows an example of a paging control channel and a mobile station discontinuous reception system that employs multi-station simultaneous individual sequential transmission, which is the premise of the present invention. The MBS time slot Bk corresponds to each radio base station. It is an individual sequential transmission slot in which a station individually transmits radio waves. 2 and 3, the mobile station receives this paging control channel and intermittently receives the slot of the incoming call information corresponding to the incoming call group to which the mobile station belongs. In order to perform this intermittent reception, it is necessary to turn on the receiver power supply of the mobile station so as to be synchronized with the timing at which the incoming call information of the own incoming call group is notified.

The method for establishing synchronization is as follows. First, after receiving the paging control channel of the visited control zone and performing reception level,
From the incoming call number (0 to m) notified in the incoming call information, it is determined how many slots after which the incoming call group of the own mobile station is notified,
A value that allows for the rising margin of the receiver 4 is set in the timer 75, and the timer 75 is started. At the same time as the timer 75 times out, the power supply of the receiver 4 is turned on.
After turning on the power for the time that can receive the incoming call information, set the time until the next incoming call information can be received in the timer 75 again, start the timer 75, and turn off the power of the receiving unit 4. ". After that, the intermittent reception can be continued by correcting the timer value each time the incoming call information is received. Further, since the same P-ch incoming information is broadcast in synchronization from a plurality of radio base stations in the same control zone, it is possible to maintain intermittent reception regardless of wireless zone transition.

Next, when there is a call origination request, the mobile station
Continuously receive the paging control channel in order to select the wireless zone with the maximum reception level for communication. When the MBS time slot Bk (k = 1 to N) is received at least once, the reception levels of the radio zones of the respective base stations are compared with each other, and the mobile station is in the zone corresponding to the MBS time slot having the maximum reception level. Judgment is made and a transmission request signal is transmitted using this MBS information.

When an incoming signal is received, the calling number included in the incoming signal is compared with the calling number of the mobile station of its own, and only when they match, the wireless zone is selected. The method of selecting the wireless zone is the same as that at the time of calling, and after the selection is completed, when the incoming signal is received again, the incoming response signal is transmitted.
The incoming call is the operation of the radio base station, and it waits for the response signal to the incoming signal for a certain period of time when the incoming signal is sent out. Normally, the margin of time for the mobile station to finish the MBS selection is due to the management processing of the signal response of the paging control channel. Not because of such reasons. In the present invention, the same incoming signal is transmitted again from the base station after a time sufficient for the mobile station to finish the MRS selection, and the mobile station side sends the first incoming signal as a response signal to the most transmitted incoming signal. The MRA selection result after reception is used.

FIG. 4 is a flow chart showing the operation of the mobile communication system according to another embodiment of the present invention. In FIG. 4, a mobile station having the same circuit configuration and transmission control method shown in FIG. 1 collates the calling number as described above when an incoming signal is received, and only when they match, MBS selection is performed. The incoming call answering operation is started based on the MBS selection result.
As described above, the radio base station transmits the incoming signal again after a lapse of a time sufficient for the mobile station to finish the MRS selection after the incoming signal is transmitted, and the mobile station receives the incoming signal within a certain time after receiving the incoming signal. Incoming call response signal must be sent to. At this time, if the base station cannot take enough time to retransmit the incoming signal due to the system,
Since the mobile station cannot take the timing of sending the incoming call response, the incoming call cannot be answered. Therefore, if a method for sending an incoming call response by a control operation is provided in the outgoing call control channel (A-ch) as in the case of outgoing call, even if the incoming call signal is not retransmitted, the incoming call response signal is sent out without depending on the timing. it can.

Also, the radio base station side informs in advance on the call control channel that information on whether or not the mobile station can retransmit the incoming call after the mobile station has taken sufficient time to complete the MBS selection,
The mobile station can judge the information, select the incoming call response method to be performed, and send the incoming call response according to the MBS information in the area.

By the above-mentioned method for selecting the localized zone of movement, it is possible to greatly reduce the current consumption and perform the intermittent reception in which only the own group incoming signal is received within the same control zone.

[0032]

As described above, the present invention has the excellent effects that the current consumption is reduced, the battery usage time is lengthened, and the connection control is reliably performed.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a mobile station of a mobile communication system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a signal configuration of a paging control channel and a discontinuous reception operation of the mobile communication system of the present invention.

FIG. 3 is a flowchart showing the operation of the mobile communication system of the present invention.

FIG. 4 is a flowchart showing the operation of a mobile communication system according to another embodiment of the present invention.

FIG. 5 is a conceptual diagram of a mobile communication system.

FIG. 6 is a diagram showing a signal configuration of a paging control channel of a mobile communication system.

[Explanation of symbols]

1 Radio Control Station 2 Antenna 3 Duplexer 4 Receiver 5 Transmitter 6 Synthesizer 7 Controller 71 Input / Output 72 CPU 73 ROM 74 RAM 75 Timer 76 Clock Generator B1 to BN MBS Time Slot (Time slot of radio base station ) M mobile stations P1 to Pm time slots (N radio base stations transmit at the same time) ZN radio zone

Claims (2)

[Claims] 1. A radio base station comprising an integer number N of 1 or more and a plurality of mobile stations, wherein the N radio zones covered by the N radio base stations form one control zone. The radio base station uses the signal (P + B) of the call control channel.
Including a means for transmitting to the mobile station, the mobile station comprises a control means including a location zone determination means for selecting a radio base station to communicate with the mobile station based on the signal of the paging control channel, The signal of the paging control channel is a common time slot (P1 to Pm) in which all the radio base stations simultaneously transmit the incoming call information corresponding to the incoming call group of the mobile station for each group, and the radio base stations transmit the incoming call information. In a mobile communication system configured by repeating the time slots (B1 to BN) for N radio base stations that sequentially transmit the radio base station information unique to each station, the control means is Characterized in that it includes means for intermittently receiving incoming call information corresponding to an incoming call group to which the own station belongs, and means for prohibiting activation of the zone-in-zone determining means except for an outgoing call request or an incoming call request. Mobile communication system that. 2. The control means performs a transmitting operation via a transmission control channel based on the wireless base station information of the existing zone after the wireless zone determination during transmission, and a calling control channel after the wireless zone determination during the incoming call. 2. A means for performing an incoming call response operation via an outgoing call control channel.
Mobile communication system described.