KR20030096614A - Cellular communication system by using mobile base station transceiver subsystem - Google Patents

Abstract

PURPOSE: A cellular phone communication system using a BTS(Base Station Transceiver Subsystem) is provided to enable transceivers to use ISM(Industrial Scientific and Medical) bands as frequencies and to use frequency hopping spread spectrum signals as a communication modulating method, thereby securing reliability and a data rate. CONSTITUTION: A BSC(210) is connected with a wire backbone network(200). A fixed BTS(300) is connected with the BSC(210) by a wire link. Many frequency hopping modulation transceivers(410,420) implement wireless access networks between a mobile BTS(100) and the fixed BTS(300). The frequency hopping modulation transceivers(410,420) use ISM bands as frequencies, and use spread spectrum signals as a communication modulating method since the ISM bands are shared by various apparatuses.

Description

Cellular communication system using mobile base station {CELLULAR COMMUNICATION SYSTEM BY USING MOBILE BASE STATION TRANSCEIVER SUBSYSTEM}

The present invention relates to a cellular communication system using a Base Station Transceiver Subsystem (BTS). More particularly, the present invention provides an access network of a mobile base station in a wireless network to enhance convenience of construction and operation of the system. The present invention relates to a cellular communication system using a mobile base station to reduce costs.

As is well known, a mobile base station is a device for temporarily providing a mobile telephone service in an area in which a large amount of call is concentrated for a certain period of time. The mobile base station is not significantly different from a fixed base station, but may be mounted on a vehicle or the like.

As shown in FIG. 1, the configuration of a cellular communication system using a mobile base station according to the related art includes a base station controller (BSC) connected to a wired backbone network 20. (21) is connected to the wire link to implement the access network. Typically, the wire link uses an E1 line used to connect the fixed base station 30 and the base station controller 21.

In such a cellular communication system, in the case of a fixed base station, it is preferable to use a wired link, that is, an E1 line, in terms of reliability, while in the case of a mobile base station, the installation location is continuously changed. The point of pulling the line to the mobile base station acted as a problem in system construction and has a problem of increasing the system construction cost.

The present invention has been proposed to solve such a conventional problem, cellular communication using a mobile base station to improve the convenience of the construction and operation of the system and to reduce the cost by implementing the access network of the mobile base station in a wireless network The purpose is to provide a system.

According to one aspect of the present invention for realizing the above object, a cellular communication system includes a mobile base station, a base station controller connected to a wired backbone network, a fixed base station connected to the base station controller by a wire link, and the mobile base station; A plurality of transceivers for implementing a wireless access network between the fixed base stations; The transceiver uses an ISM band as frequency and a frequency hopping spread spectrum signal as a communication modulation scheme.

In another aspect of the present invention, a cellular communication system includes a mobile base station, a base station controller linked to a wired backbone network, and a plurality of transceivers for implementing a wireless access network between the base station controller and the mobile base station. In the case of a LOS environment between the base station controller and the mobile base station, the transceiver uses an ISM band as a frequency and a frequency hopping spread spectrum signal as a communication modulation scheme.

1 is a block diagram of a cellular communication system using a mobile base station according to the prior art;

2 is a configuration diagram of a cellular communication system using a mobile base station according to the first embodiment of the present invention;

3A and 3B are schematic diagrams of a cellular communication system using a mobile base station according to a second embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100, 500: mobile base station 200, 600: wired backbone network

210, 610: base station controller 300: fixed base station

410, 420, 710, 720: frequency hopping modulation transceiver

800: repeater

There may be a plurality of embodiments of the present invention. Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings. This embodiment allows for a better understanding of the objects, features and advantages of the present invention.

2 is a configuration diagram of a cellular communication system using a mobile base station according to a first embodiment of the present invention, wherein the base station controller 210 and the base station controller (linked to the mobile base station 100, the wired backbone network 200) ( A fixed base station 300 coupled to a wired link (eg, an E1 line) to a plurality of frequency hopping modulation transceivers 410 and 420 implementing a wireless access network between the mobile base station 100 and the fixed base station 300. Is done.

Frequency hopping modulation transceivers 410 and 420 use an Industrial, Scientific and Medical (ISM) band as the frequency. Since the ISM band is a frequency shared by multiple devices, there is a high possibility of interference, so the spread spectrum signal according to IEEE 802.11 Direct (Sequence & Frequency Hopping) is used as a communication modulation method to effectively remove external interference. do.

As described above, according to the first embodiment of the present invention, even if the location of the mobile base station 100 is changed, a frequency hopping modulation transceiver 410 may be installed in a fixed base station 300 that is already installed in a nearby area to establish a communication network. Therefore, compared with the prior art, the system construction is relatively convenient and the construction cost is reduced.

On the other hand, since one wired link (line E1) needs to provide services for two base stations (fixed base station and mobile base station), since the service capacity may be exceeded, the fixed base station 300 connects to the base station controller 210. Applicable when the capacity of the wired link (E1 line) is sufficient.

3A and 3B are structural diagrams of a cellular communication system using a mobile base station according to a second embodiment of the present invention. The base station controller 610 and the base station controller 610 associated with the mobile base station 500, the wired backbone network 600, A plurality of frequency hopping modulation transceivers 710 and 720 for implementing a wireless access network between the control device 600 and the mobile base station 500, and the repeater 800.

When the base station controller 600 and the frequency hopping modulation transceiver 710 are connected through a dedicated network (eg, an in-house network), the base station controller 600 and the mobile base station 500 are in a line of sight (LOS) environment. The frequency hopping modulation transceivers 410 and 420 use the ISM band as the frequency and use the frequency hopping spread spectrum signal in the same manner as the first embodiment to guarantee a data transmission speed of 3Mbps or more.

The repeater 800 is a relay link that is selectively applied when the distance between the base station controller 600 and the mobile base station 500 is 10 km or more, and extends a communication available distance between the frequency hopping modulation transceivers 710 and 720. .

In the above description, but limited to the embodiment of the present invention, it is obvious that the technology of the present invention can be easily modified by those skilled in the art. Such modified embodiments should be included in the technical spirit described in the claims of the present invention.

As described above, the present invention ensures sufficient reliability and transmission speed between the base station controller and the mobile base station while implementing the access network of the mobile base station in a wireless network, thereby improving convenience in system construction and operation and reducing costs. It is effective.

Claims (3)

A mobile base station, a base station controller linked to a wired backbone network, a fixed base station connected to the base station controller by a wired link, and a plurality of transceivers for implementing a wireless access network between the mobile base station and the fixed base station; The transceiver uses an ISM band as frequency and uses a frequency hopping spread spectrum signal as a communication modulation scheme. A base station controller connected to a mobile base station, a wired backbone network, and a plurality of transceivers for implementing a wireless access network between the base station controller and the mobile base station, And the transceiver uses an ISM band as a frequency and uses a frequency hopping spread spectrum signal as a communication modulation scheme when the base station controller and the mobile base station are in an LOS environment. The method of claim 2, And a repeater for extending a communication available distance between the transceivers selectively applied when the distance between the base station controller and the mobile base station is greater than or equal to a predetermined distance.