JPH08223627A - Digital radio telephone system - Google Patents

Abstract

PURPOSE: To enable the zone switching of almost no-hit with a single communication part in the TDMA/TDD system digital radio telephone system. CONSTITUTION: This system is composed of an inter-base station radio communication means (1) 7 for speaking with a base station at a mobile station 1 which enables zone switching, speech slot monitoring means 11 for monitoring a physical slot under communicating in order to discriminate whether the mobile station 1 enables the no-hit zone switching or not corresponding to the position of the physical slot under communication, zone switching decision level monitoring means 12 for preparing timing to send out a zone switching request to the base station, and zone switching requesting means 13 for outputting the zone switching request to the base station.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital radio telephone apparatus which requires zone switching of a mobile station which moves within a radio zone of a base station.

[0002]

2. Description of the Related Art As a conventional hitless zone switching system, consider a digital radio telephone apparatus in which a mobile station determines a zone switching timing and a zone switching destination base station. It is premised that the mobile station has an inter-base station wireless communication means for monitoring the control signal of another base station during a call in order to realize the hitless zone switching.

A conventional digital radio telephone device will be described below with reference to the drawings. FIG. 7 is a block diagram of a mobile station of a conventional digital wireless telephone device.

Reference numeral 2 is a transmitting means for inputting the voice of the user and transmitting it to the other party, 3 is a receiving means for receiving the voice from the other party, 4 is a voice interface means for converting a voice signal and an electric signal, 5 Is an operation means for the user to perform dial input, on-hook, off-hook, and other operations for wireless communication. Reference numeral 6 is a display means including an LED and LCD for displaying information such as a dial number and date. Reference numeral 7 is an inter-base station wireless communication means for communicating a control signal and a call signal between the mobile station and the base station. Reference numeral 8 is an antenna for transmitting and receiving radio waves to and from a base station, and 9 is a base for checking whether or not the base station ID is the same for radio reception by transmitting a base station identification code (hereinafter referred to as ID) Base station ID storage means for storing the station ID. A mobile station ID storage means 10 stores a mobile station ID for wireless transmission, and sends the mobile station ID for transmission, and for wireless reception, stores the mobile station ID for checking whether the mobile station IDs are the same. Reference numeral 12 denotes a zone switching determination level monitoring means for monitoring a zone switching determination level for the mobile station to trigger a zone switching request, and 13 denotes a base when the zone switching determination level monitoring means 12 activates the zone switching request. Zone switching request means for sending a zone switching request to a station, 15 is an inter-base station wireless communication means for monitoring a wireless control signal of another base station while the mobile station is in wireless communication, and 14 is the above means Control means for controlling, 1 is a mobile station provided with the above means. The zone switching of the mobile station will be described below.

As a method of switching the zone of a mobile station, consider automatic switching on the mobile station side. This is a system in which the mobile station judges the electric field level of the radio control signal and the base station ID and sends a zone switching request to the base station. The operation will be described below. During a call via the inter-base station wireless communication means 7, the control means periodically determines the electric field level of wireless communication via the zone switching determination level monitoring means 12. When the electric field level of the wireless communication becomes low to some extent, the wireless communication electric field level from another base station is received. Zone switching judgment level monitoring means 1
Reference numeral 2 denotes the wireless communication level of the base station currently in communication received by the inter-base station wireless communication means 7, and the inter-base station wireless communication means 15.
Compare the radio communication levels of other base stations received in.
As a result, if the radio control signal from another base station has a higher level than the radio control signal of the base station currently in communication, the control means causes the zone switching request means 13 to send a zone switching request to the base station. With the above configuration, the conventional wireless telephone device can realize non-interruption zone switching.

FIG. 8 is a schematic configuration diagram of a conventional radiotelephone device. 16 is a mobile station, 17 is a base station, 18 is a base station 1
7 wireless zone, 19 a control station for controlling and managing the base station 17 and the mobile station 16, 20 a control station 19 and the base station 17
Is an extension line for connecting the control station 19 and the public network switching station.

[0007]

However, in the conventional zone switching system of the digital radiotelephone device as described above, two radio communication means are used in the mobile unit to realize the non-instantaneous zone switching (2 There is a problem that the cost of the mobile station becomes high because it is necessary to communicate using a synth system).

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide a digital radiotelephone device capable of realizing non-instantaneous interruption zone switching with only one radio communication means.

[0009]

In order to solve the above-mentioned conventional problems, the present invention detects the reception level of a base station during a call, and when the reception level falls below a predetermined value, the base during the call is in progress. If the control channel of another base station is received during the time when it is not communicating with the station and it is higher than the reception level of the signal from the base station in communication, the base station in communication is It has a control unit for switching to the base station.

[0010]

According to the present invention, with the above-mentioned configuration, it is possible to perform non-instantaneous interruption zone switching with one communication unit.

[0011]

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

The components having the same functions as those of the conventional example will be described with the same reference numerals. FIG. 1 shows the first embodiment of the present invention.
3 is a block diagram showing a configuration of a digital wireless telephone device in the embodiment of FIG. FIG. 2 is a schematic configuration diagram of the digital wireless telephone device of the embodiment. FIG. 3 is a block diagram of the zone switching area of the digital wireless telephone device of the same embodiment.

The control means 14 provided in the mobile station 1 is different from the conventional mobile station 1 in that a call slot monitoring means 11 for monitoring a physical slot in communication is additionally connected.

The zone switching system of the digital radio telephone apparatus of the present invention constructed as above will be described with reference to the flow charts shown in FIGS.

First, while the mobile station 1 is in a call with the base station, the zone switching determination level monitoring means 12 receives a reception level deterioration of less than the reception level regulation value 1 (# 1). Upon receiving the reception level deterioration, the control means 14 determines whether or not the reception level deterioration has reached less than the specified value 2 (a level smaller than the specified value 1 and the minimum level at which communication is possible) (# 2). If the reception level is less than the specified value 2, recalling type zone switching (not instantaneous interruption zone switching)
If the reception level is 2 or more, the communication slot monitoring means 11 checks whether the communication channel reception slot is at position 3 (# 3). If the communication channel reception slot is at position 3, the control channel of the peripheral base station (assuming that the control channel is always in slot 1) is received, and the control channel with the best reception is selected ( # 4). The control channel selected as a result of # 4 is compared with the base station ID currently in communication stored in the base station ID storage means 9 to check whether it is another base station control channel (# 5). As a result of the check, if the control channel is another base station control channel, it is checked whether the control channel reception level is equal to or higher than the specified value 2 (# 6). If the result of the check is that the specified value is 2 or more, then it is checked whether the reception level of the control channel is higher than the reception level of the communication channel (# 7). If the result is large, a zone switching request is transmitted to the next base station in communication (# 8). After that, the mobile station receives the zone switching permission from the base station in the call (# 9). Here, in the zone switching permission, the carrier information and the slot number must be included in the information for communicating with the zone switching destination base station. Next, the mobile station 1 which has received the zone switching permission performs a synchronization burst with the base station (# 1
0). After performing the synchronization burst, the mobile station 1 forms a call with the base station (# 11). Then, the mobile station 1 is in a call with the base station.

Next, in judging the reception level in # 2,
The zone switching method when the reception level is less than the specified value 2 will be described below. While the mobile station 1 is talking with the base station, the mobile station 1 detects the reception level deterioration by the zone switching determination level monitoring means 12 (# 1). Next, it is determined whether the reception level is less than the specified value 2 (# 2). If the reception level is less than the specified value 2 as a result of the determination, the call is interrupted. Then, the mobile station 1 receives the control channel of the peripheral base station by the inter-base station wireless communication means 7 and selects the control channel of the base station N which is the best reception (# 12).
When that control channel is selected, it is then determined whether the control channel reception level is at or above the specified value 2 (# 13).

If the judgment result control channel reception level is not less than the specified value 2, a call request (zone switch call request) is sent to the base station N (# 14). After that, the mobile station 1 receives a call request response from the base station N (# 15). After that, a synchronization burst for forming a call with the base station N is performed (#
16). After performing the synchronization burst with the base station N, the mobile station 1 then forms a call with the base station N and talks with the base station N (# 17). As described above, according to the present embodiment, in the zone switching system of the wireless telephone device, by providing the call slot monitoring means 11, the zone switching can be performed without interruption when the call slot is at the position 3. In addition, it is possible to perform zone switching smoothly at low cost by performing recalling-type zone switching even at positions other than the position where the communication slot is 3.

In the present invention, the mobile station 1 connected to the base station may be single or plural. Further, the number of communication slots is limited to four in order to simplify the description, but any number may be used as long as it is four or more.

Next, a second embodiment described in claim 2 will be described below. The schematic configuration diagram and the zone switching method have been described in the first embodiment described in claim 1, and therefore will be omitted. In the second embodiment, in addition to the first embodiment, when the call slots are 2 and 4, the call slot 3
Shows a method in which the base station changes the communication slot to 3 as soon as it becomes available. A signal sequence when the call slot 3 shown in FIG. 6 becomes empty will be described. First, while the mobile station 1 is in a call with the base station (# 18), the base station moves to slot 3
Know that there is an empty space (# 19). The base station, which has learned that the vacancy has occurred, checks whether or not there is a mobile station 1 communicating in another slot, and as a result, if there is a mobile station 1 communicating in another slot, , Its mobile station 1
A slot switching instruction (CS-ID is the same, carrier x, slot 3) instructing slot 3 is sent to (# 20). The mobile station 1 that has received the slot switching instruction sends a sync burst signal to the base station (# 21), and the base station sends a sync burst signal to the mobile station 1 (# 22). As a result, when synchronization is achieved, the mobile station 1 and the base station are in communication in slot 3. By issuing the slot switching instruction as described above, the frequency of use of the slot 3 is increased, and as a result, it is possible to increase the number of cases in which the non-interruptible zone switching that is effective only when talking in the slot 3 is possible. It becomes possible to perform zone switching more smoothly.

[0020]

The present invention detects the reception level of a base station during a call, and when the reception level becomes a predetermined value or less, the reception level of another base station during the time when communication is not performed with the base station during the call. If the control channel is received and the signal level from the base station in the call is higher than the reception level of the signal, the base station performing the call has a control unit for switching from the base station in the call to another base station. It becomes possible to perform non-instantaneous interruption zone switching with one communication unit, and it is possible to realize downsizing, weight reduction, and cost reduction of the mobile station.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a digital wireless telephone device according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a digital wireless telephone device of the same embodiment.

FIG. 3 is a block diagram of a zone switching area of the digital wireless telephone device of the embodiment.

FIG. 4 is an operation flowchart regarding zone switching of the digital wireless telephone device of the embodiment.

FIG. 5 is an operation flowchart regarding zone switching of the digital wireless telephone device of the embodiment.

FIG. 6 is a signal sequence diagram when a vacant call slot 3 is generated in the digital wireless telephone device according to the second embodiment of the present invention.

FIG. 7 is a block diagram of a mobile station of a conventional digital wireless telephone device.

FIG. 8 is a schematic configuration diagram of a conventional wireless telephone device.

[Explanation of symbols]

 1 Mobile Station 2 Talking Means 3 Listening Means 4 Voice Interface Means 5 Operating Means 6 Display Means 7 Inter-Base Station Wireless Communication Means 8 Antennas 9 Base Station ID Storage Means 10 Mobile Station ID Means 11 Call Slot Monitoring Means 12 Zone Switching Judgment Level monitoring means 13 Zone switching request means 14 Control means 15 Inter-base station wireless communication means

Claims (5)

[Claims] 1. A control channel and an information channel of a communication frame in which at least one control channel for exchanging control information with a base station and a plurality of information channels for exchanging information such as voice data are arranged in a time division manner. A communication unit that uses one to intermittently communicate with the base station;
When it is determined that the reception level is below a predetermined value from the level monitoring means during the call with the level monitoring means for detecting the reception level of the base station received by the communication unit, Controls the communication unit while not communicating with the base station to receive the control channel of another base station, and if the reception level of the signal from the base station in communication is higher, controls the communication unit. A digital radiotelephone device, comprising: a control unit that performs switching control for switching a base station that makes a call from a base station that is currently making a call to another base station. 2. The digital radiotelephone device according to claim 1, wherein the control unit performs switching control when the control channel and the information channel in communication are not adjacent to each other. 3. The control unit scans an information channel which is not adjacent to the control channel when the control channel and the information channel in communication are adjacent to each other, and when the information channel is empty, shifts the channel for communication. 3. The digital wireless telephone device according to claim 2, which is controlled. 4. A communication frame in which the communication section carries out time division multiplex communication, in which four channels of a first channel, a second channel, a third channel, and a fourth channel are arranged in time series, and a control channel is set in the first channel. And a channel in which information channels are arranged in the second channel, the third channel, and the fourth channel, and the control unit performs switching control when the communication unit uses the third channel of the communication channels. Claim 1 characterized by the above.
The described digital wireless telephone device. 5. When the communication unit is communicating with a base station on a second channel or a fourth channel,
5. The digital radio telephone apparatus according to claim 4, wherein the third channel is scanned, and if the third channel is idle, the channel for making a call is changed to the third channel.