JPH03101427A - Mobile communication line control system - Google Patents

Abstract

PURPOSE:To reduce the cost of a controller and to improve the efficiency by sending a common control channel from one control base station so as to specify the transmission timing of a base station of each radio zone. CONSTITUTION:Common control information sent from a control base station 10 is received by radio zone base stations 1a-1d and a reference timing is extracted from the information. Then timers 4a-4d having a timer time specified for the radio zone base stations 1a-1d are operated and when each timer reaches the specified timer time, processors 3a-3d drive transmitters 2a-2d and an individual control channel is sent for the specified time slot. Thus, the mobile communication line control with low cost and high efficiency is implemented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mobile communication line control system that uses a control channel using the same frequency in each wireless zone.

[Conventional technology]

In mobile communication systems, a wireless zone is set up around one base station in which it can effectively communicate with mobile stations, and this base station and mobile stations within the wireless zone specify a channel and communicate. % method % In such a method, in order to make effective use of one frequency whose service area is made up of multiple wireless zones, the radius of the wireless zone is made small and the same wireless frequency is used for different wireless zones. A method is adopted in which it is repeatedly allocated and used.

Furthermore, the mobile device is caused to perform a location registration operation to clarify the zone in which the mobile device is located. In this case, in the method of performing location registration for each radio zone, location registration is performed as the mobile device moves, so the number of location registrations is extremely large, which increases the load on the control device.

Furthermore, it is necessary to change the frequency of the control channel used for paging for each radio zone, which requires a large number of paging frequencies.

However, the rate of time that one call uses the control channel is
The mobile device paging area (mobile device control area) has a large zone configuration that includes multiple wireless zones, and is small compared to the time rate in which the call channel is used, and in order to use the control channel effectively, A method using a frequency control channel is used. The actual station configuration of the radio network control station and the relationship between the i-line zone and the mobile equipment control area are shown in Figures 4 and 5. In Figure 5, the symbol R represents the radius of the mobile equipment control area. r represents the radius of each wireless zone.

Next, as a method of transmitting control information common to each wireless zone and individual information for each wireless zone on the same frequency, transmission time is allocated to each wireless base station in advance, and the common control channel portion is transmitted from each wireless base station. There is a method in which the information is transmitted all at once, and each radio base station transmits the individual control channel portion in turn.

FIG. 6 shows the signal sending timing in this method.

That is, each base station (MBS (1) to MBS (4))
After transmitting the common control information (P) from the base station, each base station transmits the individual control information (MI-M4) in turn.

[Problem to be solved by the invention]

As mentioned above, in order to make the mobile device control area (hereinafter also simply referred to as "control zone") into a large zone configuration consisting of one frequency, it is necessary to distribute common control information to each radio base station, and to distribute common control information to each base station. It was necessary to align signal transmission timing between stations.

157 device configurations of actual radio network control stations and radio base stations
As shown in the figure.

In FIG. 7, 50a to 50d are each wireless base station (MB
S(1) to MBS(4)), 51a to 51d are MBS
Individual control information transmitting device, 52a to 52d are buffers;
53a-53d are MCU facing communication devices, 54a-54
d is a phase adjustment device, 60 is a radio channel control unit (MCU),
61m to 61d represent communication devices for MBSjt, and 62 represents a common $ system control information 1 collection device.

Such conventional device configurations of the radio network control station and each radio base station have the following problems (1) and (2).

(1) Conventionally, in order to distribute common control signals, wired lines were set up between the radio line control station (also referred to as "control base station") 60 and each of the radio base stations 50a to 50cl.
The equipment cost was enormous, increasing the cost of the entire system.

(2) Also, in order to align the signal transmission timing of each wireless base station 503 to 50d, conventionally, among the wired lines set between each wireless zone and the wireless network control station 60, the wireless base station with the longest delay The maximum delay amount at each radio base station 50 to 50d was measured, and the delay amount at each radio base station 50 to 50d was adjusted to the maximum delay amount, thereby aligning the signal transmission timing.

For this reason, the signal delay due to the wired section has become large.

In order to solve these problems, the present invention provides, for example, a high-power control base station in the center of the control zone, and transmits common control signals all at once from there, thereby achieving low-cost and highly efficient mobile communication. The purpose is to provide a line control method.

[Means to solve the problem]

According to the invention, the above-mentioned object is achieved by the means specified in the claims.

That is, the present invention has a plurality of wireless zones in one wireless line control area, and a common control channel that is information common to each wireless zone within the control area and information that is individual for each wireless zone. Wireless zone individual control channel,
A mobile communication line that transmits a common control channel in a large zone consisting of one base station, in a mobile communication system that has means for controlling mobile GJ aircraft by transmitting on the same frequency at a time allotted to each base station. It is a control method.

[For production]

In the present invention, (1) in the "Problems to be Solved by the Invention" section is achieved by using a control zone consisting of a plurality of wireless zones and base stations that cover the wireless zones.
problem is solved.

Furthermore, the timing at which each wireless zone base station (synonymous with "wireless base station", the same shall apply hereinafter) receives a common control signal transmitted from the control base station, and transmits an individual control signal for each wireless zone based on the received signal. By determining
Problem (2) in the [Problem to be Solved by the Invention] section is resolved.

Note that the means for realizing the control zone include, for example, a method of making the control base station have higher power than the wireless zone base station;
Various methods can be considered, such as placing the control base station on a high tower or the like that has a better line of sight than the wireless zone, or using a satellite as the control base station.

Further, as a means for receiving the common control signal and determining the timing of the individual control signal, for example, a time slot is allocated to each wireless zone in advance and the common control signal is trigged.
-, and the timing is determined using a processor or the like, or by writing the transmission timing of the X-ray zone into the contents of the common control signal.

〔Example〕

Figure #1 is a diagram showing an example of the configuration of a wireless zone and a control zone to which the present invention is applied. The small circle indicated by a solid line indicates a wireless zone (wireless base station zone), and the large circle indicated by a broken line indicates a control zone ( It represents the BJR control area). Here, it is assumed that the control base station is located at B. The radius of the wireless zone is r''3km, the radius of the control zone is R=15, and the height of the wireless zone base station is h=50u.

Let the height of the control zone base station be H=200.

Consider a method to make the electric field level around the control zone equal to the electric field level around the wireless zone.

From the known reference electric field curve, for example, if the receiving antenna height is 1
．． When using the 5-1900MH2 band, the electric field strength at a location 3 km away from the transmission point when the base station antenna height is 50 m is 60 dBμ V/m /lkw ERP
, H=200m, the electric field strength at a point 15km away from the transmission point is 49 dBμ V/+o /lkw E
There is RP'C'. From this, the transmission power of the wireless base station is I
If W, then the transmission power of the control base station is I) 11d
It can be seen that setting B to a high value, that is, about 13W, is sufficient.

By designing in this way, multiple 5! ! i, #iI
A control zone with a large zone radius can be configured with one control base station.

In addition to this method, there is also a method in which the power of the control base station is made equal to the transmission power of the wireless zone base station and only the height of the control base station is increased. Possible methods include increasing only the transmission power of the control base station or using a communication satellite as the control base station.

Next, an embodiment in which each wireless zone creates its own base station transmission timing will be described.

The configuration of the control channel used in the present invention is shown in Figure 2. The shaded time slots in Figure 2 contain common control information (P
), and the other time slots indicate each wireless zone base station individual control information (MM4).

The common control information (P) is transmitted by the control base station, and the individual control information (M + ~M4) is transmitted by each wireless base station (MBS (1)
~MBS(4)). Channels are usually the same. FM (Tl ~
After T4), own wireless zone individual control information 11j (M+ ~
M,) is sent.

Furthermore, FIG. 3 shows the control base station and radio base station apparatus I! according to the present invention. The configuration is shown, and 18 to 1d are wireless base stations (wireless zone base stations) (MBS (1) - MBS (4)
), 2m-2d is MBS individual control information transmitting device, 3a
~3d is a processor (CPU), 4a to 4d are Tia+er, 58 to 5d are common control information receiving devices, 10 is a control base station (MCU), 11 is a common control information transmitting device, 12 is a common It represents the control information ii collection device.

The common control information transmitted from the control base station 10 is transmitted to the wireless zone base stations (MBS(1)=MBS(4))la~1
d receives the signal and extracts the reference timing from it.

A possible method for this reference timing is to include a predetermined signal pattern as part of the common control signal and to detect this by the processors (CPUs) 3a to 3d. Next, timers 4a to 4d having a timer time specified for each wireless zone base station 18 to 1d are operated according to the reference timing, and when the specified timer time has been reached, the processors 3a to 3d operate the transmitter 2a. ~2d and transmits a dedicated control channel in a prescribed time slot. This timer time may be determined in advance for each base station, written in a part of the common control information channel, or the like.

In addition to the method of obtaining the reference timing from the common control information, it is also possible to obtain the reference timing from the individual control information of other xai zones. In this case, it is necessary to prepare a means for identifying and specifying the wireless zone, such as adding an identifier for each wireless zone to the individual control information.

〔Effect of the invention〕

As explained above, the present invention is a system in which one control base station transmits a common control channel and thereby defines the transmission timing of each wireless zone base station. Since functions such as sending and receiving common control information between wireless zones and phase matching of transmission signals using wired lines between wireless zones can be reduced, the cost of the control device can be significantly reduced.

Furthermore, it becomes possible to control mobile devices without being affected by delays in wired sections.

[Brief explanation of drawings]

tiS1 is a diagram showing an example of a wireless zone and control zone configuration to which the present invention is applied, FIG. 2 is a diagram showing signal transmission timing in an embodiment of the present invention, and FIG. 3 is a diagram showing a control base station in an embodiment of the present invention. FIG. 4 is a diagram showing the equipment configuration of a radio base station, FIG. 4 is a diagram showing the radio aspect Ili, and FIG. 5 is a diagram showing the station configuration of a control station. FIG. FIG. 7 is a diagram showing the signal transmission timing of the conventional method, and is a diagram showing the device configuration of a radio network control station and a radio base station according to the conventional method. 1a~]d... Each wireless base station (MBS (1)
MBS (4)),

Claims (1)

[Claims] One wireless line control area has multiple wireless zones, and within the control area there is a common control channel, which is information common to each wireless zone, and a wireless zone individual control channel, which is information specific to each wireless zone. , a mobile communication system that has means for controlling mobile devices by transmitting on the same frequency at a time allotted to each base station, characterized in that a common control channel is transmitted in a large zone consisting of one base station. A mobile communication line control method.