KR20010066201A - Self healable signal distribution network by single optic ring structure for mobile communications - Google Patents

Abstract

PURPOSE: A ring-structured single optical line mobile communication signal distribution network having an automatic fault recovery function is provided to configure a mobile communication network of high reliability by transmitting mobile communication traffic signals in an optical wavelength division multiplexing method or a dense wavelength division multiplexing method much more stably than an old star-structured mobile communication network configuration. CONSTITUTION: An RNC(Radio Network Controller)(1) covers a function to control a plurality of BTSs(Base station Transceiver Subsystems)(2). The BTSs(2) are connected to a D/U(Donor Unit)(3), and their forward traffic electrical signals are converted into one or two optical signals per BTS in the D/U(3). The optical signals respectively are multiplexed into an optical output by an optical wavelength multiplexer in the D/U(3) and transmitted clockwise and counterclockwise. Among the forward optical signals transmitted in two ways, only an optical signal of a wavelength corresponding to each BTS(2) in a one-to-one ratio is first dropped at each R/U(Remote Unit)(4), then converted into the electrical signal again, and finally radiated through an antenna. At this moment, each R/U(4) is switched over so as to select either of the two signals transmitted from the D/U(3).

Description

SINGLE HEALABLE SIGNAL DISTRIBUTION NETWORK BY SINGLE OPTIC RING STRUCTURE FOR MOBILE COMMUNICATIONS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication signal distribution network using a single optical fiber structure having an annular structure having an automatic recovery function. The present invention relates to a mobile communication analog signal and a digital signal using a single optical fiber annular structure of Dense Wavelength Division Multiplexing (DWDM). It is a network for effectively transmitting and distributing signals. In addition, the purpose of the present invention is to improve the reliability of the system and the network by maintaining the flow of traffic even in the event of various unexpected network failures such as transmission line disconnection, network node device failure, and disaster such as earthquake / fire / flood.

If the existing mobile communication mainly provided voice signal-oriented services, the future mobile communication services are mainly voice signals, high-speed data services such as mobile video phones, VOD (Video-On-Demand), and high-speed Internet services. It is expected to achieve. However, the mobile communication network up to now provides a service with a transmission rate of up to 64kbps per channel, so it can be said that the high speed multimedia service is difficult. Therefore, in the present invention, a high-density optical wavelength division multiplexing method using only a single optical fiber enables a large-capacity bidirectional mobile communication service through ultra-high speed, for example, signal transmission between nodes of 2.5 Gbps or more.

In addition, in the case of such a high-speed signal transmission network, unlike the shaping network method [FIG. (b)] and a separate supervisory channel and a central control switching circuit are added to each node to form a mobile communication network with high reliability.

The present invention is to construct a high-density wavelength division multiplexed annular network consisting of one light beam as shown in Figure 1 (b) for the construction of a mobile communication network aiming to provide a large capacity multimedia service including a video signal, each remote node The fault signal detected through the network fault detection circuit is transmitted to the central node using a monitoring channel that is used separately from the traffic transmission channel. The failure signal of each remote node received from the central node generates the necessary control signals for each remote node including the central node by the microprocessor, and the entire network is simultaneously switched for network failure recovery. The signal is looped back from the current signal transmission direction to maintain the flow of traffic.

FIG. 1 shows an automatic failover function by adding a supervisory channel and a central control switching circuit to each node of the present invention. A comparison diagram through an embodiment of the annular mobile communication signal distribution network having the same (FIG. 1 (b)).

2 is a block diagram of an exemplary embodiment of signal flow (forward and reverse) during normal operation of a single-beam mobile communication signal distribution network having an annular structure having an automatic failover function according to the present invention.

FIG. 3 is a block diagram illustrating an exemplary embodiment of a signal flow (forward and reverse) in the event of a network failure of a single-beam mobile communication signal distribution network having an annular structure having an automatic failover function according to the present invention. FIG.

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

1: Radio Network Controller (RNC)

2: BTS (Base station Tranceiver Subsystem)

3, 6: Central node unit (D / U: Donor Unit)

4, 5: Remote node device (R / U: Remote Unit)

In order to achieve the object and technical problem of the present invention, in the present invention, a single optical fiber of an annular structure using high density wavelength division multiplexing (DWDM) is used to effectively transmit and distribute a large-capacity, multi-channel mobile communication signal to each remote node. It is what constitutes a network. This annular network is composed of one central node unit (D / U: Donor Unit) and a plurality of remote node units (R / U: Remote Unit).

The central node device (D / U) allocates one or two wavelengths to each of a plurality of base station transceiver subsystems (BTSs) connected to a radio network controller (RNC: Radio Network Controller), thereby providing a corresponding remote node device (R). / U) send and receive signals. At this time, each base station and the remote node device corresponds to 1: 1, the central node device includes a central control unit for controlling the switching circuit of each remote node, including the central node in order to maintain the traffic flow in the event of a network failure.

The remote node device (R / U) receives an optical signal of one or two wavelengths transmitted from a desired central node by using an optical add-drop multiplexer (OADM) in the device or again by using an optical signal of the same wavelength. Send the desired data to the node device. Like the central node device, the remote node device includes a switching circuit for automatic recovery in case of network failure, and the monitoring and switching operations of each remote node are all controlled by the central node device.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a configuration diagram of an exemplary embodiment of a normal operation of a single-beam mobile communication signal distribution network having an annular structure having an automatic failover function according to the present invention.

Figure 2 (a) shows the flow of the forward signal during normal operation. RNC (1) is a kind of base station controller to control a plurality of BTS (2), each BTS (2) is connected to the D / U (3) and the forward traffic electrical signals of the BTS (2) D / U (3) is converted into one or two optical signals per BTS (2). The optical signals for each BTS (2) are multiplexed to one light output by the optical wavelength multiplexer in the D / U (3) and then transmitted in both clockwise and counterclockwise directions. The forward optical signals of multiple wavelengths transmitted in both directions are converted into electrical signals after only the optical signals of the corresponding wavelengths (one or two) corresponding to BTS 2 and 1: 1 in each R / U 4 are dropped. Radiated through the antenna At this time, each R / U 4 is switched to select only one of the two signals transmitted from the D / U 3.

FIG. 2 (b) shows the flow of the reverse signal during normal operation, in which signals received at each R / U (5) have all / light (the same wavelength as that dropped at the corresponding R / U (5)). E / O: Electrical to Optic) After conversion, it is transmitted in one direction clockwise or counterclockwise. The reverse traffic signals of each of these R / Us 5 are finally input to the D / U 6 with the same number of same wavelengths that were used for the forward transmission. The reverse traffic optical signals of each R / U 5 received at the D / U 6 are demultiplexed into a plurality of optical signals by the optical wavelength demultiplexer in the D / U 6 and then the optical / electric (O / E: Optic to Electrical) is converted and input to the relevant BTS (7).

3 is a block diagram of an exemplary embodiment of a network failure of an annular structure mobile communication signal distribution network having an automatic failover function according to the present invention.

FIG. 3 (a) shows the forward signal flow in the case of assuming network failure due to an unexpected optical line disconnection in an arbitrary optical line section, and shows R / U # 4 (1) (or R / U # 5). The network failure information detected at is transmitted to the central control unit of the D / U 2 by a supervisory channel separately used for automatic recovery. The central control unit instructs each of the R / Us to switch forwards so that they can receive the forward traffic signal from the opposite direction through the monitoring channel. Thus, as in normal operation, the forward traffic signal sent from the D / U 2 in both directions is transferred to the R / U 1 through the path opposite to the point where the network failure occurs.

The transfer path already secured for forward traffic signaling is also used for reverse signal transmission in case of network failure in FIG. 3 (b). The transmission direction of the reverse traffic signal of each R / U (3) is the forward traffic signal transmission. Direction to the D / U 4 in the opposite direction. The reverse traffic optical signals of each R / U (3) received from the D / U (4) are input to the D / U (4) through two paths unlike the normal operation, and thereafter, the signal processing process during normal operation. Is the same as

The single-lane mobile communication signal distribution network of the annular structure having the automatic failover function of the present invention provides a high-speed, high-capacity mobile communication multimedia service using a high-density optical wavelength division scheme (DWDM) through one optical line. By being configured, it is possible to obtain a very large economic benefit compared to the existing mobile communication network. In addition, automatic recovery through the central control method of the network itself can fundamentally prevent a large amount of information loss and high economic loss caused by high-speed and large-capacity signal transmission in the event of a network failure.

Claims (3)

In the mobile communication network, a signal distribution network having an annular structure using a single optical path. In a mobile communication network, a signal distribution network using an optical wavelength division multiplexer (WDM) or a dense wavelength division multiplexer (DWDM) method using a single optical path. A mobile communication signal distribution network having an annular structure, wherein the optical signal is loopbacked by a switching method according to a supervisory channel and a control signal, thereby having an automatic network failover function.