JPH09252483A - Signal transmission method and base station equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a signal transmission method between a base station and a control station and the base station equipment in which a control load of the base station is relieved so as to attain a more stable control operation. SOLUTION: This method is made cup of a control station 3, a base station 1 controlled by the control station 3, and a mobile station 5 moved in a service area by the base station 1 and mobile communication is conducted between the base station 1 and the mobile station 5 via a frame and a slot. Then in the case of communication of the control station 3 with the mobile station 5, the control station 3 provides a number to the frame and slot to be received and sends the resulting data to the base station 1 and the base station 1 sets the frame and slot according to the frame and slot number sent from the control station 3 to make transmission to the mobile station 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal transmission method between a base station and a control station in a mobile communication system and a base station device for the signal transmission method.

[0002]

2. Description of the Related Art First, as a conventional technique, a PDC (Personal Dig) currently in commercial service in Japan.
The transmission control of the paging signal in the ital cellular method will be described. In this PDC system, when the mobile station waits for a call signal from the base station,
A signal is awaited in a predetermined frame and slot. Therefore, the base station also needs to transmit a signal using the frame and slot set by this mobile station.

For example, referring to FIG. 5, the conventional transmission section of the base station 101 comprises a transmission means 111, a mobile station information management means 112, and a frame and slot number determination means 113. A case of transmitting to a mobile station using the base station 101 having such a conventional configuration will be described. Here, as shown in FIG. 6, the mobile station a has a frame number #na and a slot number #ma (#na, #na.
In ma), the mobile station b is assumed to be waiting at the frame number #nb and the slot number #mb (#nb, #mb), respectively. Therefore, the base station 101 also needs to transmit with the same frame number #na and slot number #ma.

In such a case, in the conventional PDC system, generally, when a call signal is generated on the network side, the control station gives the call signal to the base station 101 to the mobile station a. The mobile station number is added and transmitted together with the mobile station address information. On the other hand, in the base station 101, of the mobile station address information and mobile station number transmitted from this control station, the frame and slot number determination means 113 transmits only the mobile station number to the mobile station information management means 112, and this mobile station The frame number and slot number of the mobile station a are determined based on the information of the mobile station managed by the information management means 112, and the frame number and slot number are determined by the frame and slot number determination means 113 together with the mobile station address information. Then, the call signal is transmitted to the transmitting means via the frame and the call signal is transmitted to the mobile station a by using the frame number and the slot number.

[0005]

As described above, when the paging signal transmission control in the conventional PDC system is performed, it is necessary to constantly manage the state of the mobile station not only in the control station but also in the base station. However, there is a drawback that the control load on the base station increases because of the occurrence. In addition, since the control station and the base station perform the same state management for the same mobile station, the states of the mobile stations obtained by the respective stations are different.
This causes a so-called state mismatch, and if the states do not match, the mobile communication system may not operate normally.

[0006] The present invention has been made in view of the above problems, and a signal transmission method between a base station and a control station and a base for reducing the control load of the base station and enabling more stable control operation. It is intended to provide a station device.

[0007]

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention comprises a control station, a base station controlled by the control station, and a base station. A mobile communication system configured with a mobile station moving in a service area, and performing communication between a base station and a mobile station via a frame and a slot, wherein the control station At the time of communication, the mobile station gives the frame and slot number received and transmits to the base station, and the base station sets the frame and slot according to the frame and slot number transmitted from the control station, The point is to transmit a signal to the mobile station.

That is, according to the present invention, for example, a plurality of predetermined frames are used as a repeating unit, and the mobile station sets a frame and a slot to be received by a predetermined algorithm among the repeating units, and the set frame is set. This is a TDMA mobile communication system in which signals are received only by itself. When a signal is sent from a control station to a mobile station, the control station assigns the frame and slot number received by the mobile station and sends it to the base station. The base station transmits a signal to the mobile station using the frame and slot designated by the control station.

Further, the invention according to claim 2 is a control station,
A mobile communication system including a base station controlled by the control station and a mobile station moving within a service area of the base station, and performing communication between the base station and the mobile station via a frame and a slot. The base station apparatus of claim 1, wherein a frame and a slot for communication with the mobile station are set according to a frame and a slot number transmitted from the control station, and a signal is transmitted to the mobile station. To do.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to the drawings. FIG. 1 shows a TDM according to the present invention.
FIG. 3 is a block diagram showing a configuration of an A mobile communication system.

As shown in FIG. 1, the base station 1 and the control station 3 for controlling the base station 1 are connected by a wired or wireless control line 2 for exchanging signals. The wireless zone 6 is a service area covered by the base station 1. The mobile station 5 located in the wireless zone 6 communicates with the base station 1 via the wireless channel 4. Further, the base station 1 is provided with only the transmission means 11 as a part related to transmission, and does not have the mobile station information management means 112 and the control means 113 included in the conventional base station 101 shown in FIG.

FIG. 2 shows an example of the structure of the radio channel 4 in FIG. 1. In the example shown in FIG. 2, the radio channel 4 is formed by repeating N frames, and each frame is further composed of It is configured by repeating M slots. In FIG. 2, the upper row shows the structure of frame numbers that are continuously and repeatedly given to individual frames, and the lower row shows the structure of slot numbers that are continuously and repeatedly given to individual slots. There is.

FIG. 3 is a diagram showing an example of a format of a signal addressed to a mobile station in the embodiment of the present invention. Specifically, FIG. 3A shows an example of the format of the signal addressed to the mobile station sent from the control station 3 to the base station 1, and FIG. 3B shows the format addressed to the mobile station sent from the base station 1 to the mobile station 5. The example of a signal format is shown.

Here, referring to FIG. 3A, in the signal addressed to the mobile station (control station 3 → base station 1), 301 indicates a message type indicating that the signal is addressed to the mobile station, Reference numeral 302 denotes a frame number of a wireless channel for the base station to communicate with the mobile station, 303 denotes a slot number of a wireless channel for the base station to communicate with the mobile station, and 304 denotes a mobile station. It shows the information addressed to the station. Further, referring to FIG. 3B, in the mobile station-destined signal (base station 1 → mobile station 5), 305 indicates the same information addressed to the mobile station as 304. The mobile station address information 304 and 305 includes information for identifying the mobile station 5 and the message type for the mobile station.
Since the information is not directly related to the base station 1, it is not specified here.

Next, referring to FIG. 4, operations of the control station 3, the base station 1 and the mobile station 5 in this embodiment will be described in accordance with a processing procedure. FIG. 4 shows a sequence flow of the mobile station 5, base station 1 and control station 3 in the embodiment shown in FIG.

Referring to FIG. 4, the control station 3 includes a mobile station 5
When the information to be transmitted to the mobile station 5 is generated, first in S11, based on the information stored in the control station 3 regarding the mobile station 5 of the transmission destination, the frame number received by the mobile station 5 and The slot number is determined, and a mobile station-destined signal is generated according to the format shown in FIG. The determination of the frame number and the slot number is performed by the mobile method as shown in the digital car telephone system standard (Radio System Development Center, RCR-27D, 4.1.10.4 Channel structure determination method). This can be realized by a method of calculating by numerical calculation using a station number or a method of previously registering a frame and a slot that the mobile station wants to receive in the control station.

Next, in S13, the control station 3 sends the generated mobile station addressed signal to the base station 1 in the radio zone in which the mobile station 5 is located. Subsequently, the base station 1 that has received this mobile station addressed signal sets the frame and slot to be transmitted to the mobile station 5 according to the frame number and slot number designated by the mobile station addressed signal in S15. Further, S1
In 7, the base station 1 sends a signal addressed to the mobile station 5 to the mobile station 5 using the frame and slot set in S15.

As is clear from this series of operations, the base station 1 may set the frame and slot to the mobile station 5 according to the frame and slot number designated by the control station 3 and transmit the signal. Since the base station 1 does not need to manage the state of the mobile station 5, the control load on the base station 1 can be reduced as compared with the conventional case.
Further, since it is only the control station 3 that needs to manage the state of the mobile station 5, there is no factor that causes the state inconsistency, and the system as a whole can operate more stably than before.

As described above, according to the base station of the present embodiment, the base station does not include the mobile station information management means and control means included in the conventional base station. It can be configured as a small size
It is lightweight and inexpensive, and makes it easier to install the base station. Further, since the base station does not perform processing for setting the frame number and the slot number, it is possible to shorten the processing time in the base station and save valuable communication resources.

[0020]

As described above, according to the present invention, the base station sets the frame and slot for communication according to the frame and slot number transmitted from the control station, and transmits to the mobile station. Therefore, the control load of the base station can be reduced as compared with the conventional case, and further, more stable operation of the entire system can be achieved.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a configuration of a radio channel according to the embodiment of the present invention.

FIG. 3 is a diagram showing an example of a format of a signal addressed to a mobile station according to the embodiment of the present invention.

FIG. 4 is a diagram showing a sequence flow of a control station, a base station, and a mobile station according to the embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a base station in a conventional mobile communication system.

FIG. 6 is a timing chart showing an example of a reception operation of a mobile station in standby.

[Explanation of symbols]

 1 Base Station 2 Control Line 3 Control Station 4 Radio Channel 5 Mobile Station 6 Radio Zone 11 Transmission Means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yusho Tomoda 2-10-1 Toranomon, Minato-ku, Tokyo NTT Mobile Communication Network Co., Ltd.

Claims (2)

[Claims] 1. A control station, a base station controlled by the control station, and a mobile station that moves within a service area of the base station, and communication between the base station and the mobile station is performed in advance. A signal transmission method in a mobile communication system, which carries out via a defined frame and slot, wherein the control station assigns the frame and slot number received by the mobile station when communicating with the mobile station. The base station and the control station, wherein the base station sets a frame and a slot according to the frame and the slot number transmitted from the control station, and transmits to the mobile station. Signal transmission method between the two. 2. A control station, a base station controlled by the control station, and a mobile station that moves within a service area of the base station, and communication between the base station and the mobile station is performed in advance. A base station device of a mobile communication system, which performs a predetermined frame and a slot, wherein a frame and a slot are set according to a frame and a slot number transmitted from the control station, and transmission to the mobile station is performed. A characteristic base station device.