JP3409556B2 - Pseudo base station apparatus and control method therefor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pseudo base station device used for digital mobile communication and a control method thereof.

[0002]

2. Description of the Related Art FIG. 3 shows a test configuration for a handover using a conventional pseudo base station device. In FIG. 3, the pseudo base stations 11 and 12 form independent time division frames for the mobile station 13, and the mobile station 13 is connected to the telecommunication network 14 via the pseudo base station 11. .

Next, the operation of simulating a handover using the pseudo base station device will be described. FIG. 4 is a schematic diagram showing an operation state of the pseudo base stations 11 and 12 when simulating a handover. When simulating the handover, first, in order to reproduce the deterioration of the call level (reception level) due to the movement of the mobile station 13 between zones, as shown in FIG. Is controlled so that the reception level of the mobile station 13 is below the handover processing level. Furthermore, in order to reproduce the maintenance of the call in the movement-destination zone, as shown in FIG.
The transmission output of No. 2 is controlled so that the reception level of the mobile station 13 is higher than the handover destination selection level. In this way, the conventional pseudo base station apparatus also implements the handover by the pseudo base stations 11 and 12.

[0004]

However, in the above-described conventional pseudo base station apparatus, in order to send different broadcast signals, the pseudo base stations of two systems and the synchronization processing between these pseudo base stations and the base station exchange function are provided. However, there is a problem in that the cost of the device is high and there is an economical problem, and a control method for each device must be established and maintenance must be performed.

The present invention solves the above-mentioned conventional problems, and a pseudo base station apparatus and a control method therefor capable of realizing handover with one pseudo base station and enabling handover control with a simple control method. The purpose is to provide.

[0006]

In order to solve the above problems, the present invention controls a transmission level of a plurality of slots of a frame in a pseudo base station device of a data transmission system using a multi-carrier time division multiplexed frame. Means, a means for sending a pseudo different base station broadcast signal to any two of the plurality of slots of the frame, and a switching source and switching destination control slot used for handover of the mobile station. And means for selecting a communication slot.

[0007] As described above, it is possible to simply implement the handover by simulating the maintenance of the call by one pseudo base station device.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention controls the transmission level of a plurality of slots of a frame in a pseudo base station device of a data transmission system using a multi-carrier time division multiplexed frame. Means, means for sending pseudo broadcast signals of different base stations to any two of the plurality of slots of the frame, and communication with the switching source and switching destination control slots used for handover of the mobile station And a means for selecting a slot for use, and has an effect of simulating the maintenance of a call by one pseudo base station device and realizing a simple handover.

The invention according to claim 2 is a pseudo base station device of a data transmission system using a multi-carrier time division multiplexed frame, and any one of the two within one frame is used.
A notification signal for artificially notifying the radio condition or system configuration of the base station is sent to one of the two slots, the signal level of the notification signal is changed, and the other of the two slots is pseudo different from the base station. It sends a notification signal to notify the wireless status of the base station and the system configuration and performs a mobile station handover in the same frame. It simplifies the call maintenance by a single pseudo base station device. It has an effect of realizing handover.

The following is a description of the embodiments of the present invention with reference to FIGS.
A description will be given with reference to FIG. (Embodiment 1) FIG. 1 is a block diagram showing a configuration of a pseudo base station apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 1 is a radio unit for making a radio connection with a mobile station, and the radio unit 1 has two synthesizers. Therefore, the radio unit 1 has a function of changing the carrier and the level in consecutive slots in the slot operation in which the multi-carrier time division multiplexing is performed. Reference numeral 2 is a modulation / demodulation unit, and this modulation / demodulation unit 2 is an interface unit between a radio signal and a digital baseband signal. 3 is a channel codec and a demultiplexer,
The channel codec and demultiplexing unit 3 synthesizes and separates digital baseband signals (that is, adds a code of a predetermined pattern for synchronizing data, a bit for detecting an error, etc., and calculates these codes. , Retrieve result data). Further, the channel codec and demultiplexing unit 3 can specify at least two control slots and communication slots for each slot in the slot operation of the multi-carrier time division multiplexing.

Further, in FIG. 1, reference numeral 4 denotes a voice I / F section, and this voice I / F section 4 converts data to be transmitted / received to / from a mobile station into a voice. The part corresponding to the interface part with
This device has a voice I / F for call confirmation. Reference numeral 5 is a wireless control unit, and this wireless control unit 5 generates a control signal for controlling the wireless unit 1. 6 for control
This is a PU, and the control CPU 6 manages the control of the entire apparatus and the communication protocol.

Next, the operation and control method of the pseudo base station apparatus according to this embodiment will be described.

Here, the procedure of communication between the pseudo base station apparatus and the mobile station will be briefly described. First, the mobile station receives the annunciation signal of the pseudo base station device and registers the location, and constantly updates the data such as the wireless state, the system configuration, the presence or absence of an incoming call. Next, when an incoming call is made from the pseudo base station device or an outgoing call is made from the mobile station, the communication state is established, whereby the communication channel is assigned, and the communication is performed after some control signals are exchanged. .

Next, a method of controlling the pseudo base station device will be described with reference to FIG. FIG. 2 is a state transition diagram of four slots at the time of performing simple handover in a time division multiplexed frame in mobile communication.

FIG. 2A shows an initial state at the time of performing the simple handover, in which control signals having different base station information are transmitted on the same frame. That is, a signal at the handover processing level or higher is transmitted to one slot (hereinafter referred to as slot 1), and a signal at the handover destination selection level or lower is transmitted to the other slot (hereinafter referred to as slot 3). Send out. One of the other two slots is not sent. Therefore, this state simulates a state in which control slots of two base stations (hereinafter, base station 1 and base station 2) are present on the same frame and one slot is vacant. ing.

In the state shown in FIG. 2 (a), the mobile station performs position registration with respect to the control signal of slot 1 and enters the standby state. Therefore, as shown in FIG. 2B, slot 2 is assigned to a communication slot, and the mobile station is controlled to use the control signal of slot 1 to make a call. Therefore,
In the state shown in FIG. 2B, the mobile station simulates a call state via the base station 1 in a pseudo manner.

Next, as shown in FIG. 2C, the transmission levels of slot 1 and slot 2 are controlled to be equal to or lower than the handover processing level, and the transmission level of slot 3 is controlled to be equal to or higher than the handover destination selection level. This weakens the radio wave from the base station 1 due to the movement of the mobile station,
Along with that, the state in which the radio wave from the base station 2 becomes stronger is reproduced.

In the state of FIG. 2 (c), the mobile station disconnects the communication via the control signal of slot 1, registers the position for the control signal of slot 3, and enters the standby state. Therefore, as shown in FIG. 2D, the slot 2 is assigned to the communication slot, and the mobile station is controlled to use the control signal of the slot 3 to make a call. Therefore, FIG.
In the state shown in (d), the mobile station virtually reproduces the call state via the base station 2, whereby the handover is completed.

As described above, according to this embodiment, slots 1 to 4 are arranged in a time division multiplexed frame,
The two slots (slot 1 and slot 3) in the frame are used as control slots to broadcast different base station information, the transmission level is controlled, and the mobile station reproduces the communication state in slot 2 via slot 1. Then, the transmission levels of slots 1 and 2 are lowered, the transmission level of slot 3 is raised, and the mobile station starts communication via slot 3 and completes the handover. As a result, handover can be easily realized by one pseudo base station device.

[0020]

As described above, according to the present invention, in a pseudo base station device that communicates with a mobile station by data transmission of a multicarrier time division multiplexing system in mobile communication, pseudo two arbitrary solots are simulated. It sends a notification signal of different base stations, by controlling the level of the broadcast signal, has the effect that it is possible to realize a handover by one pseudo base station apparatus.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a pseudo base station device according to an embodiment of the present invention.

FIG. 2 is a state transition diagram at the time of performing handover in the same embodiment.

FIG. 3 is a block diagram showing a configuration of a conventional pseudo base station device.

FIG. 4 is a schematic diagram showing an operating state of a conventional pseudo base station device.

[Explanation of symbols]

1 radio section 2 Modulation and demodulation section 3-channel codec and demultiplexer 4 Audio I / F section 5 Wireless controller 6 Control CPU

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Claims (2)

(57) [Claims] 1. A pseudo base station device of a data transmission system using multi-carrier time division multiplexed frames,
A means for controlling the transmission level of a plurality of slots of a frame, a means for sending a pseudo different base station broadcast signal to any two of the plurality of slots of a frame, and a handover for a mobile station. A pseudo base station device comprising a switching source control slot and a switching destination control slot, and means for selecting a communication slot. 2. In a pseudo base station device of a data transmission system using a multi-carrier time division multiplexed frame, a radio state of the base station or a system configuration is artificially set in any one of two slots in one frame. A notification signal for notification is transmitted, the signal level of the notification signal is changed, and a notification signal for artificially notifying the radio state and system configuration of a base station different from the base station is artificially transmitted to the other of the two slots. A method for controlling a pseudo base station device that performs handover of a mobile station in the same frame.