KR20000047039A - Intelligent optical distribution system - Google Patents

Abstract

PURPOSE: An intelligent optical distribution system is provided to distribute the resources of a BTS(Base Transceiver Station) effectively and economically according to the traffic amount by connecting the BTS and a remote antenna by an optical cable to extend the coverage of the BTS. CONSTITUTION: A BTS interface unit generates more than two forward sector signals by assigning a plurality of forward PN signals to more than two remote antennas. A BTS repeater, generating remote antenna control signals and pilot signals, detects reverse relay PN signals inputted through the optical cable from the remote antennas and provides the detected signals to the BTS interface unit. More than two remote antenna interface units, connected with the BTS repeater by the optical cable and installed in the remote antenna domains, receives reverse channel signals from mobile stations through transceiver antennas and forward channel signals from the BTS repeater.

Description

Intelligent light dispersion system

The present invention relates to a relay system for CDMA (Code Division Modulation), and more particularly to an optical relay system for CDMA that extends the coverage of a base station by connecting a base station and a remote antenna with an optical cable.

In a wireless communication system as known, a mobile communication service area is classified into a plurality of cells in order to extend coverage of a mobile telephone network, and each of the plurality of cells is provided with a base station for service in each cell. The width of the cell is determined according to the traffic volume of the region. That is, the urban area traffic with a large amount of traffic decreases the cell radius and increases the cell radius relatively in a small area so that traffic generated in each cell does not exceed the processing capacity of the base station in charge of the corresponding wireless service.

However, when the traffic volume fluctuates greatly in time, in order to enable service even during a bursting call period, the radius of the cell and the capacity of the base station should be set in consideration of the case in which a lot of traffic occurs. In this case, therefore, the base station utilization becomes low at idle time except for the bursting time.

In a region where radio communication is rarely used, however, even if the radius of the cell is increased, the traffic volume of the region may be significantly smaller than the processing capacity of the installed base station. In this case, there is also a limit to increasing the radius of the cell, which eventually wastes unused resources of the base station. In addition, in the service area of the mountainous terrain, the size of the relayable cell radius is reduced.

An example of a wireless communication relay system for solving the above problems is disclosed in European Patent Application No. 0,391,597 presented by AT & T. AT & T presents a microcell wireless communication system in European Patent Application No. 0,391,597.

In the AT & T microcell wireless communication system, one cell is classified into a plurality of microcells, and each of the plurality of macrocells is provided with an antenna device. A plurality of antenna devices installed in the plurality of microcells and the base station serving the cells are interconnected by an optical cable network. Each of the plurality of antennas in the cell is connected to the base station via an optical cable. Therefore, each antenna is connected to the base station. This relay method is called the integrated star method.

The microcell relay system increases the number of microcells as the traffic in the cell increases, thereby expanding the traffic capacity of the base station through the reuse of resources.

However, in the microcell relay system, since the base station and a plurality of antennas must be connected in a point-to-multipoint method (star method), there is a problem in that a large cost is generated due to the installation of the optical cable.

In addition, the base station has to allocate resources to all the microcells regardless of the call volume, there is a problem that the base station is overloaded.

In addition, when the optical cable is connected between the antenna device and the base station to cover a small traffic area of the base station and a long distance, there is a problem that the base station in the area is larger than the cost of installing the base station.

For this reason, there is a need for a relay system capable of distributing the resources of the base station according to the traffic volume and installing an optical cable at a lower cost.

Accordingly, the present invention was created in view of the above circumstances, and an object of the present invention is to

In order to solve the problem of overloading the base station by allocating resources to all the microcells, it is possible to distribute the base station resources according to the traffic volume, and to install the optical cable at a lower cost, the base station resources can be efficiently and efficiently. It is to provide an intelligent light distribution system that can optimize and distribute time.

1 is a block diagram showing an intelligent light distribution system according to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

MSC ..... Mobile Service Switching Center

BSC ...... Basic Station Controller

BTS ...... Base Transceiver Station

An intelligent optical distribution system according to the present invention for achieving the above objects, the mobile communication service by allocating a plurality of forward PN signals from the base station to two or more remote antennas, respectively, to the amount of traffic around the antenna A base station matching device for generating at least two forward sector signals by allocating the PN signal to each of the antennas accordingly;

Generate a remote antenna control signal and a pilot signal, and perform broadband division multiplexing together with the two or more PN signals to generate a forward relay signal, optically modulate the forward relay signal and output the optical relay signal to the at least two remote antennas; A base station repeater for respectively detecting a reverse relay PN signal input through the optical cable from each, and providing each detected signal to the base station matching device; And

Connected to the base station repeater by the optical cable, installed in the two or more remote antenna areas, and configured to receive reverse channel signals from mobile stations and transmit forward channel signals from the base station repeater via a transmit / receive antenna; At least two remote antenna matching devices.

In addition, each of the at least two remote antenna matching device, receiving the forward optical modulation signal input through the optical cable to detect the remote antenna control signal and the pilot signal, and detects one of the forward PN signals Transmit to the outside through the transmission and reception antenna.

Each of the remote antenna matching devices receives reverse channel signals from a plurality of mobile stations received by the transmit / receive antenna, modulate the reverse channel signals based on the remote antenna control signal, and generates a reverse PN signal. The optical reverse PN signals are modulated and output to the optical cable.

In the optical dispersion system for CDMA, each of the two or more remote antenna matching devices receives the forward optical modulation signal input through the optical cable, and extracts one of the two or more forward PN signals. It transmits to the outside through the transmission and reception antenna.

Also, receiving reverse channel signals from a plurality of mobile stations received by the transmit / receive antenna, modulate the reverse channel signals to generate a reverse PN signal, and optically modulate the generated PN signals to the optical cable. .

According to the intelligent optical distribution system for CDMA according to the present invention, it is possible to efficiently distribute the limited resources of the base station, and also to connect the base station matching device and a plurality of remote antennas in a linear network structure and a ring structure with a single optical cable As a result, it is possible to establish a wireless communication network at a lower cost.

In addition, the intelligent light distribution system according to the present invention comprises a base station for generating two or more PN signals; Wideband division multiplexing the two or more PN signals to generate a forward relay signal, and outputting a forward optical modulated signal generated by light modulating the forward relay signal to an optical cable, wherein the light from each of the two or more remote antennas A base station matching device for respectively detecting reverse PN signals from reverse relay signals input through a cable, and providing the detected reverse PN signals to the base station; And connected to the base station matching device by the optical cable, installed in the two or more service areas, receiving reverse channel signals from mobile stations and transmitting and receiving forward channel signals from the base station matching device through a transmit / receive antenna. It consists of two or more remote antenna matching devices.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a block diagram showing an intelligent light distribution system according to an embodiment of the present invention. In the terminology used in FIG. 1, MSC denotes a mobile service switching center, BSC denotes a basic station controller, and BTS denotes a base transceiver station.

In the intelligent light distribution system according to the present invention, the capacity of the base station in FIG. 1 is dynamically allocated to a position that is geometrically distributed based on the subscriber's request. The allocation increases the utilization of the base station and reduces the number of necessary base stations.

Instead of distributing base stations in a service area (hereinafter, referred to as a cell), an intelligent optical distribution system wirelessly distributes remote antennas to subscribers (or mobile stations) within the cell.

The base station allocates resources according to the number of subscribers located in each of the cells where the plurality of remote antennas are located.

The allocation of dynamic resources of the present invention is shown in Table-1 below.

TABLE 1

Traffic T1 10 100 Traffic T2 100 10 Total traffic Tt 110 110

Table -1 shows an example of dynamic allocation of radio resources. In Table -1 above,

In Table -1, for example, when serving the cells with a base station (BTS) having three PN (sectors α, β, and ν) signals and a remote antenna, it is possible to access a high-traffic region as shown in FIG. Service by assigning different PN. If the area that generates a lot of traffic changes over time, as shown in the profit table -1, the area (Traffic T1) that previously served by dividing the cell as a different PN signal by combining the cells with the same PN ( Traffic Tt), an area that previously allocated the same PN and combined the cells to serve the divided PNs. The PN signal allocation can be programmed to change to a preset preset according to a pattern of traffic fluctuations, for example, afternoon morning days, weekdays, weekend weeks, or time zone, and in some cases, automatic PN allocation according to traffic fluctuations. This can be done.

Therefore, according to the above configuration, the resources of the base station can always be efficiently used regardless of the variation in the traffic volume, thus increasing the investment efficiency. In addition, since the remote antennas can be connected through a single optical cable, it is possible to more efficiently improve network construction costs and coverage of wireless communication.

As described above, according to the intelligent optical distribution system for CAMA according to the present invention, it is possible to efficiently distribute limited resources of the base station, and also to connect the base station and a plurality of remote antennas with a single optical cable, thereby enabling wireless communication at a lower cost. To be equipped.

In addition, although the present invention has been described in detail with reference to the above-described embodiments, the present invention is not limited thereto, and the present invention may be modified or improved within the scope of syntactic knowledge of operators.

Claims (7)

In order to provide a mobile communication service by assigning a plurality of forward PN signals from a base station to two or more remote antennas, two or more forward sector signals are allocated by assigning the PN signals to each of the antennas according to the traffic volume around the antennas. A base station matching device for generating; Generate a remote antenna control signal and a pilot signal, and perform broadband division multiplexing together with the two or more PN signals to generate a forward relay signal, optically modulate the forward relay signal and output the optical relay signal to the at least two remote antennas; A base station repeater for respectively detecting a reverse relay PN signal input through the optical cable from each, and providing each detected signal to the base station matching device; And Connected to the base station repeater by the optical cable, installed in the two or more remote antenna areas, and configured to receive reverse channel signals from mobile stations and transmit forward channel signals from the base station repeater via a transmit / receive antenna; An optical dispersion system for CDMA, comprising at least two remote antenna matching devices. The method of claim 1, Each of the at least two remote antenna matching devices receives the forward optical modulation signal input through the optical cable to detect the remote antenna control signal and the pilot signal, and detects one of the forward PN signals. Optical dispersion system for CDMA, characterized in that for transmitting to the outside via a transmit and receive antenna. The method of claim 1, Each of the remote antenna matching devices receives reverse channel signals from a plurality of mobile stations received by the transceiver antennas, modulates the reverse channel signals based on the remote antenna control signal, and generates a reverse PN signal. And optically modulate the generated reverse PN signals to the optical cable. The method of claim 1, And the optical cable is a single core optical cable. The method of claim 1, And assign a different PN signal to the plurality of remote antennas and change the cell radius accordingly. The method of claim 1, And an optimal PN arrangement according to a time zone according to a pre-programmed method for dynamic allocation of radio resources according to the traffic variation around the cell where the remote antenna is installed. The method of claim 1, For dynamic allocation of radio resources, it monitors the traffic fluctuations around the cell where the remote antenna is installed and accordingly automatically changes the PN arrangement to adjust the cell radius and dynamically allocate radio resources to maximize the use of radio resources of the base station. Optical dispersion system for CDMA.