KR101931325B1 - Traffic distributing system for optical repeater using ori - Google Patents

Abstract

The present invention relates to a traffic distributing system of an optical repeater for improving service quality by distributing load of traffic of a base station and enabling efficient network configuration for an existing wireless network, And a plurality of remote units connected to the terminal by receiving a signal converted into an optical standard signal by each donor unit and a remote analysis unit for estimating data traffic for the donor unit and the remote unit, The donor unit estimates the data traffic of the base station, calculates the traffic ranking, distributes the service signals to the calculated base stations, and allocates the distributed service signals to the connected remote units, respectively And provides an optical repeater traffic distribution system.

Description

[0001] TRAFFIC DISTRIBUTING SYSTEM FOR OPTICAL REPEATER USING ORI [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an optical repeater of a base station, and more particularly, to a traffic distribution system of an optical repeater that improves service quality by distributing load of traffic of a base station and enables efficient network configuration to an existing wireless network .

A transmission / reception system for providing a mobile phone service such as an LTE service typically processes a signal for each sector via a base transceiver station (BTS), and transmits an electric signal of the base station to an optical signal (Optical Signal), and then the converted optical signal is transmitted to a remote repeater, amplified through it, and transmitted through an antenna.

Since the traffic processing capacity of each base station has a limitation, each mobile phone service provider has to deal with traffic volume limitation or additional base station in order to solve this problem. In recent years, as the use of data has rapidly increased, the amount of traffic to be processed by each base station has rapidly increased, and at the same time, there is a great deal of economic burden to install and maintain.

For this purpose, an optical transmission system using an optical repeater is used to enable wireless communication even in a radio wave shadow area. In the case of the optical repeater, a path of a signal transmitted from a base station to an antenna is physically connected through a combiner capable of directing direction, and a remote optical unit ROU : Remote Optic Unit). Thus, when a subscriber attempts to make a call in a region served by a remote optical repeater, the optical repeater processes the signal through a base station that is physically directly connected.

Korean Patent Laid-Open Publication No. 10-2004-0009095 discloses a base station and a control apparatus for an optical relay period in the prior art, and FIG. 1 is a configuration diagram thereof.

The mobile communication system to which the optical repeater is connected is configured to relay signals received from the base station 100, the mobile terminal 120 for wireless communication with the base station 100 and the base station 100 or the mobile terminal 120, 120 or an optical repeater 110 for transmitting to the base station 100.

The optical repeater 110 includes a slave unit 112 for transmitting and receiving signals between the master unit 111 and the mobile terminal 120 for transmitting and receiving signals to and from the base station 100.

The master unit 111 and the slave unit 112 are generally connected via optical cables of about 2 to 20 km and the slave unit 112 includes an antenna for transmitting and receiving signals to and from the mobile terminal 120.

However, in the case of the communication service using the optical repeater, since the traffic is managed by each base station and is not managed by the optical repeater, it is difficult to accurately grasp the traffic of the communication service. As a result, it is difficult to manage traffic for each base station and optical repeater . Because the digital frame of existing optical repeater operates with sampling clock of 100Msps, it is also difficult to use chip supporting JESD 204B standard, which is high-speed serial interface between FPGA and ADC / DAC.

In particular, there is a continuing demand for economical facilities for improving the dispersion and efficiency of traffic among a plurality of base stations.

 SUMMARY OF THE INVENTION The present invention is conceived to overcome the problems of the prior art described above, and it is an object of the present invention to provide a traffic distribution system of an optical repeater which can flexibly adapt to a traffic in an established base station by improving a communication interface and a configuration between a donor and a remote .

According to an aspect of the present invention, there is provided a wireless communication system including a first donor unit and a second donor unit connected to a plurality of base stations and having a traffic analysis unit for estimating data traffic for each base station; And a first remote unit 1300 and a second remote unit 1400 having a plurality of remote units connected to the terminal by receiving signals converted into optical standard signals by the first and second donor units, The first donor unit and the second donor unit are connected to each other by an open radio equipment interface (ORI) protocol, and the first donor unit and the second donor unit estimate the data traffic of the base station, And distributes the service signals to the calculated base stations and allocates them to the remote units. If the amount of traffic of the service signal from one base station is larger than the amount of traffic of service signals from other base stations, the remote of the first remote unit And a remote unit included in the first remote unit and the remote unit included in the second remote unit. Accordingly, dispersion due to optical communication can be efficiently performed according to the provision of the ORI protocol.
The traffic analyzer may determine a plurality of remote units to be allocated when a priority service signal is determined.
The traffic analyzer may analyze a forward resource block (RB) for a service signal to estimate a data traffic and calculate a rank according to the data traffic.
The first donor unit and the second donor unit include a donor ORI framer that converts an LTE service signal into an open wireless equipment interface and provides it to the optical communication line and a donor ORI framer that converts a signal from the remote units into an RF signal and provides it to the base station And a remote ORI framer for converting the signal converted from the donor ORI framer into a signal capable of being transmitted in a radio frequency and converting the signal from the terminal into a donor ORI de-framer, It is preferable to include a de-framer.
Preferably, the remote unit comprises first to fourth remote units and fifth to eighth remote units connected to the first donor unit and the second donor unit through an open wireless equipment interface, and the traffic analyzing unit has a priority order The calculated service signals of the base stations may be allocated to one or more of the first to fourth remote units and one or more of the fifth to eight remote units by the first donor unit and the second donor unit.

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According to the present invention, an ORI protocol is applied to an LTE base station in an optical relay period, so that it is possible to estimate and analyze the traffic resources of a base station, and to distribute traffic to each remote unit on the basis thereof. There is an effect that can be.

1 is a configuration diagram of a base station and a control apparatus for an optical relaying period in the prior art.
2 is a block diagram for explaining an ORI-based optical repeater traffic distribution system according to the present invention.
3 is a block diagram illustrating an embodiment of a donor in an ORI-based optical repeater traffic distribution system of the present invention.
4 is a block diagram showing an embodiment of a remote unit in an ORI-based optical repeater traffic distribution system according to the present invention.

Hereinafter, an ORI-based optical repeater traffic distribution system according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

It is to be understood, however, that the embodiments described below are only for explanation of the embodiments of the present invention so that those skilled in the art can easily carry out the invention, It does not mean anything.

In the following description, when a part is referred to as being 'connected' to another part, it includes not only a direct connection but also a case where another part or device is connected in between. In addition, when a part is referred to as including an element, it is to be understood that the element may include other elements, not the exclusion of any other element, unless specifically stated otherwise.

The present invention basically comprises a plurality of donor units connected to base stations and having a traffic analyzing unit for estimating data traffic for each base station, and a plurality of donor units connected to each donor unit through an ORI protocol and distributed according to the traffic of the base station And a plurality of remote units to which signals are assigned and transmitted to the terminal.

Although MIMO (2T2R) of 20 MHz is basically described as a main example in an LTE base station (BTS), the present invention is not necessarily limited to the communication frequency and transmission / reception terminal, but various types of frequencies may be transmitted to a terminal It should be understood that it relates to a repeater for receiving from it.

In the present invention, each donor portion includes a traffic analysis unit to estimate traffic for each base station, calculate a traffic rank, and then distribute at least two of the base station signals of the traffic to two or more remote units and allocate them to two or more remote units . In the conventional communication method between the donor DU and the remote unit RU, high-speed signal processing is practically difficult. Therefore, in the present invention, an ORI (Open Radio Interface) is used.

2 is a block diagram for explaining an ORI-based optical repeater traffic distribution system according to the present invention.

In the embodiment of the present invention, two donor units are related to four base stations, and each donor unit is connected to a remote unit composed of four remote units. It should be noted that the present invention is not limited to this connection relationship .

The first donor unit 1200 and the second donor unit 1201 for exchanging RF signals from the base stations 1110, 1120, 1130 and 1140 and the first donor unit 1200, And the second donor unit 1201 constitute a traffic analysis unit capable of estimating traffic in the base stations. A preferred embodiment of such a traffic analyzing unit will be described later.

The first donor unit 1200 and the second donor unit 1201 may include two or more donor units associated with two or more base stations. Each of the first donor unit 1200 and the second donor unit 1201 may include a framer Respectively. Also, a demultiplexer for transmitting the standard optical frame received from the remote unit of the remote unit to the base station side is provided.

However, in the present invention, the open wireless equipment interface 1203 is used in consideration of communication distribution and compatibility between the donor unit and the remote unit. For this purpose, the framer and the de-framer are composed of an ORI framer and an ORI de- .

An open wireless equipment interface (hereinafter referred to as 'ORI') is an improvement of CPRI (Common Public Radio Interface) used in a distributed base station architecture for separating BBU (Base Band Unit) and RRH (Remote Radio Head) Means an open interface standard developed for compatibility. In the case of CPRI, C / M Plane, User Plane, and SYNC Plane are not defined. Therefore, there is a problem of compatibility with each manufacturer. In ORI protocol, ORI Reserved part is added to Vender Specific part and C & M Plane (ORI C & M Plane) to use Layer 2 Ethernet protocol, and it includes detailed format definition and compression algorithm of IQ data in ORI User Plane.

The first donor unit 1200 and the second donor unit 1201 receive the service signals of the first base station 1110, the second base station 1120, the third base station 1130 and the fourth base station 1140 And service signals from these are defined as first to fourth service signals, respectively. The donor unit functions to perform data relay and communication between the base station and the remote unit, and has a transmitter and a receiver respectively.

The donor unit can communicate with the base station via RF signals and can communicate with the remote unit as an optical signal through the generation of a standard optical frame.

Each donor portion may be connected to each other by a coaxial cable, an unshielded twisted pair (UTP), or an optical cable. Basically, in the present invention, an optical cable as an optical communication line is described as a main example.

The first donor unit 1200 and the second donor unit 1201 are connected by a plurality of remote units constituted by one or more remote units. In the embodiment of the present invention, four remote units connected to one optical cable Respectively.

The first remote unit 1300 connected to the first donor unit 1200 includes a first remote unit 1310, a second remote unit 1320, a third remote unit 1330 and a fourth remote unit 1340 And the second remote unit 1400 connected to the second donor unit 1201 is constituted by the fifth remote unit 1450, the sixth remote unit 1460, the seventh remote unit 1470, Unit 1480 as shown in FIG.

The remote units perform a function of connecting service signals to the respective base stations. In the present invention, according to the traffic analysis of the first donor unit 1200 and the first donor unit 1200, May be assigned to two or more remote units for service signals.

For example, it is assumed that the estimated data traffic in the donor section is ranked as follows.

Service signal Traffic ranking DU subdivision RU allocation The first service signal One The first donor portion
The second donor portion The first, second, third, and fourth remote units
The fifth remote unit The second service signal 2 The second donor portion The sixth remote unit Third service signal 3 The second donor portion The seventh remote unit Fourth service signal 4 The second donor portion The eighth remote unit

In this case, the traffic amount of the first service signal, which is a service signal from the first base station 1110, may be much larger than the second to fourth service signals.

In this case, the first donor unit 1200 is connected to each of the first remote unit 1310, the second remote unit 1320, the third remote unit 1330, and the fourth remote unit 1340 of the first remote unit 1300 , And the second donor unit 1201 may further allocate the same to the fifth remote unit 1450. [ Thus, the excessive traffic of the first service signal can be distributed to the first remote unit 1300 and the second remote unit 1400, which are different from each other.

In the case of the second to fourth service signals having a relatively lower rank, the second donor unit 1201 may allocate the service signals to the sixth to eighth remote units to process the traffic.

The allocation of service signals may be processed by ranking, and in some cases, only the highest priority service signal may be distributed by each donor unit and allocated to each remote unit.

3 is a block diagram illustrating an embodiment of a donor in an ORI-based optical repeater traffic distribution system of the present invention.

Although the first donor unit 1200 is described as an example in the present embodiment, this description may be common to a plurality of donors that are additionally configured in the present invention.

The donor unit includes a transmitting unit 1210, a receiving unit 1220, a converting unit 1230 and a traffic analyzing unit 1240. The transmitting unit and the receiving unit are respectively connected to a donor ORI framer 1213 and a donor ORI de-framer 1223.

The donor ORI framer 1213 allows the data transmitted from the base station to be formed into an optical standard frame through the ORI protocol and converts the RF signal such as the transmitted LTE signal to enable optical communication.

The donor ORI de-framer 1223 decomposes the optical frame transmitted from the remote unit to convert the RF signal, but uses the ORI protocol.

Here, the transmitter 1210 and the receiver may include a selector 1211 for collecting signals, a donor mapper 1212, and a donor mapper 1222, respectively.

In addition, an O / E conversion unit (transceiver) can be configured for connection with the remote unit. In the present invention, known configurations for adjustment of filtering, gain, and the like can be added in various ways, and a detailed description thereof will be omitted.

In the present invention, the first donor unit 1200 and the second donor unit 1201 each include a traffic analysis unit 1240. The traffic analysis unit 1240 analyzes the data traffic of the base station using various algorithms .

Basically, in an LTE service system, an RE (Resource Element) can be examined as a unit of resources defined in a forward DL. When an RE is allocated, the amount of information increases and an RB (Resource Block) . One resource block (RB) can be composed of 12 subcarriers on the frequency axis and one subframe on the time axis, and the data traffic can be calculated by analyzing the forward resource blocks.

The above example will be described once again from the point of view of the resource block.

Service signal Traffic ranking RB amount The first service signal One 25% The second service signal 2 50% Third service signal 3 75% Fourth service signal 4 100%

Each of the first donor unit 1200 and the second donor unit 1201 shares the load by performing superposition assignment for one service signal (first service signal) according to the rank of the traffic.

It should be noted that resource allocation in such an optical repeater is possible because it uses the ORI protocol.

4 is a block diagram showing an embodiment of a remote unit in an ORI-based optical repeater traffic distribution system according to the present invention.

Each of the remote units may be composed of a plurality of remote units connected to one optical communication line as described above.

The first remote unit 1310 includes a selector 1211 connected to the donor unit and collecting signals, a remote mapper and a demapper 1312, and a remote ORI framer and a de-framer 1313. .

Such a remote unit is separately connected to the first donor unit 1200 or the second donor unit 1201, receives the optical standard converted service signal in the ORI protocol, and transmits the data signal to the user terminal (for example, LTE terminal) And communication can be performed.

A remote mapper and a demapper 1312 and a remote ORI framer and a de-framer 1313 are operated for RF conversion of the converted optical standard signal from the first donor unit 1200.

The ORI-based optical repeater traffic distribution system of the present invention can estimate traffic resources of the base station by applying the ORI protocol to the LTE base station and the optical relay period, and distribute the traffic to each remote unit based on the analysis Therefore, there is an advantage that it is possible to respond flexibly to the traffic situation economically.

In the foregoing, the present invention has been described in detail based on the embodiments and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the content of the following claims.

1110, 1120, 1130, 1140 ... base stations 1200, 1201 ... donor unit
1203 ... Open wireless equipment interface 1210 ... Transmitter
1211 ... selector 1212 ... donor mapper
1213 ... donor ORI framer 1220 ... receiver
1222 ... donor mapper 1223 ... donor ORI diframer
1230 ... conversion unit 1240 ... traffic analysis unit
1300, 1400 ... remote unit 1310 ... first remote unit
1311 ... remote selector 1312 ... remote mapper and dem mapper
1313 ... remote ORI framer and de-framer
1320 ... second remote unit 1330 ... third remote unit
1340 ... fourth remote unit 1450 ... fifth remote unit
1460 ... sixth remote unit 1470 ... seventh remote unit
1480 ... 8th remote unit

Claims (5)

A first donor unit 1200 and a second donor unit 1201 each having a traffic analysis unit connected to a plurality of base stations and estimating data traffic for each base station; And
And a first remote unit 1300 and a second remote unit 1400 having a plurality of remote units connected to the terminal by receiving signals converted into optical standard signals by the first and second donor units,
The first donor unit and the second donor unit and the remote unit,
Each connected by an open radio equipment interface (ORI) protocol,
Wherein the first donor portion and the second donor portion comprise a first donor portion and a second donor portion,
Estimates the data traffic of the base station, calculates the traffic ranking, distributes the service signals to the calculated base stations, and allocates the service signals to the remote units, wherein the traffic amount of the service signal from one base station is the traffic amount The first remote unit and the second remote unit, the optical repeater traffic distribution system distributes the optical repeater traffic distribution system to the remote unit included in the first remote unit and the remote unit included in the second remote unit.

The method according to claim 1,
The traffic analyzing unit,
And determines a plurality of remote units to be allocated when a priority service signal is determined.
3. The method of claim 2,
The traffic analyzing unit,
An optical repeater traffic distribution system for analyzing a forward resource block (RB) for a service signal and estimating data traffic and calculating a rank according to the data traffic.
The method of claim 3,
The first donor portion and the second donor portion,
A donor ORI framer for converting an LTE service signal into an open wireless equipment interface and providing the LTE service signal to an optical communication line, and a donor ORI derframer for converting a signal from the remote units into an RF signal and providing it to the base station,
The remote unit includes:
And a remote ORI framer and a de-framer for converting the signal converted from the donor ORI framer so that it can be transmitted at a radio frequency and converting the signal from the terminal to be transmitted to the donor ORI de-framer.
The method according to claim 1,
The remote unit includes:
First to fourth remote units and fifth to eighth remote units connected to the first donor unit and the second donor unit by an open wireless equipment interface,
The traffic analyzing unit,
A first donor unit and a second donor unit allocate a service signal of a base station calculated with a highest priority to one or more of the first to fourth remote units and one or more of the fifth to eight remote units, Traffic distribution system.

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