KR101495116B1 - In-building mobile communication repeating system and method thereof - Google Patents

Abstract

The present invention relates to an in-building mobile communication relay system and a relaying method thereof. The in-building mobile communication relay system according to the present invention comprises a master unit (100) for converting an electrical signal obtained by optically converting a service signal into an optical signal, And a multiplexer for multiplexing the generated frame of the first capacity and regenerating the frame of the second capacity into a frame of the second capacity, And a demultiplexer for demultiplexing the regenerated frame of the second capacity into a frame of the first capacity and transmitting the separated frame of the first capacity to the service Wherein the hub unit (200) provides an interface for interconnection with an existing master unit and a new master unit, and the remote unit (30) 0) provides an interface for interconnecting the existing remote unit 300-1 and the new remote unit 300-2.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an in-building mobile communication relay system,

The present invention relates to an in-building relay system, and more particularly, to an in-building mobile communication relay system capable of changing only a block directly related to a service without changing a transmission interval and adding a new service.

Generally, an in-building relay system is composed of a master unit (MU), a hub unit (HU), and a remote unit (RU). In order to add a new service to an in-building transit system, new relay equipment supporting the new service should be added including services supported by existing in-building relay system.

Such a conventional in-building relay system has the following problems.

First, the existing relay system causes duplication of investment cost to construct new equipment when adding new service. If the existing service equipment is not installed in the place where the new service equipment is installed, there is no redundant investment, but when installing the new service equipment in the place where the existing service equipment is installed, redundant investment occurs. For example, when a LTE (Long Term Evolution) service addition is required in a place where a relay device supporting a WCDMA (Wideband Code Division Multiple Access) service is installed, a new relay device is required to install the new relay device but the new relay device 2W- LTE) is a device that includes existing WCDMA services, unnecessary investment costs may be duplicated.

Second, the transmission capacity of the relay system needs to be increased by increasing the service bandwidth in order to support high speed and quality and various multimedia services. In the conventional relay system structure, a repeater for a new service is further needed. At this time, the structure supporting the new service including the existing service generates redundant investment, and the structure supporting only the new service without supporting the existing service increases the installation and maintenance cost.

In addition, it is necessary to increase the number of unshielded twisted pair (UTP) cables for signal transmission between the hub unit and the remote unit.

For example, some 2 × 2 (MIMO) are used in LTE, and more than 4 × 4 will be used in LTE-A (LTE-Advanced) service. In addition, the frequency band of LTE can now be increased by more than 30 MHz at 10 MHz and support services for new or additional frequencies. Although it is necessary to transmit a large-capacity repeater signal, the existing repeater structure is required to increase the number of UTP cables due to the transmission capacity limit of 1 Gbps UTP.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a remote unit having a physical layer interface with different capacities, And a method of relaying the same.

The present invention also relates to a method and apparatus for multiplexing a frame of a first capacity into a unit frame to generate and transmit a frame of a second capacity and demultiplexing frames of the second capacity to generate a unit frame of a first capacity, A relay system and a relaying method thereof.

According to an aspect of the present invention, there is provided an in-building mobile communication relay system including a master unit for converting an electrical signal obtained by converting an optical signal of a service signal into an optical signal, A hub unit 200 for generating a frame of a first capacity by converting the frame into a signal, converting the generated frame into a signal, generating a frame of the first capacity, reproducing the generated frame of the first capacity and reproducing the frame of the second capacity, And a remote unit (300) for synchronizing with the hub unit (200), demultiplexing the regenerated frame of the second capacity into frames of a first capacity, and servicing frames of the separated first capacity , The hub unit 200 provides an interface for interconnection with an existing master unit and a new master unit, and the remote unit 300 includes an existing remote unit 300-1, It characterized in that it provides an interface for interconnection of the agent unit (300-2).

In addition, the in-building mobile communication relay method according to the present invention includes a step of converting an electrical signal obtained by converting one or more master units 100 into an optical frame into an optical signal and transmitting the converted optical signal to the hub unit 200, Converting the at least one optical signal received by the unit (200) into an electrical signal to convert the at least one optical signal to optical reliamission and then generating a first capacity frame; A step of transferring the regenerated second capacity frame to the remote unit 300 via the physical layer, and the step of transferring the regenerated second capacity frame to the remote unit 300, And synchronizing with the hub unit (200), demultiplexing the frame of the second capacity into the frame of the first capacity, and serving through the wireless interface.

According to another aspect of the present invention, there is provided an in-building mobile communication relay method including the steps of: receiving a frame of a first capacity generated for a corresponding service signal transmitted from another remote unit; Multiplexing the frames of the first capacity to generate a second capacity frame and transmitting the second capacity frame to the hub unit, and the hub unit reframing the second capacity frame and summing the same with the same service signal for each port; Converting the summed signals into optical frames, converting the optical framed electrical signals into optical signals, and transmitting the optical signals to the master unit of each service.

The present invention can increase the transmission capacity without increasing the number of cables by using a remote unit connected to the hub unit by one UTP (Unshielded Twisted Pair) cable and having physical layer interfaces of different capacities.

The present invention supports a service by accommodating an existing master unit and a remote unit, and increases a new master unit and a remote unit when a new service is requested. Therefore, it is possible to increase the reuse ratio and scalability of the repeater, have.

In addition, the present invention can reduce the maintenance cost because the low-power consumption is used because the devices are not separately used and the multiple devices are not used.

In addition, since the present invention uses only one UTP cable for connection between the hub unit and the remote unit, the installation cost can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an in-building mobile communication relay system related to the present invention; FIG.
Fig. 2 is a block diagram showing the hub unit shown in Fig. 1. Fig.
3 is a block diagram showing the remote unit shown in Fig. 1. Fig.
4 is a block diagram showing a detailed configuration of a second physical layer interface shown in FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram illustrating an in-building mobile communication relay system related to the present invention.

1, the in-building mobile communication relay system of the present invention includes a master unit (MU) 100, a hub unit (HU) 200, a remote unit (RU) (300).

The master unit 100 receives a service signal through wireless communication with a base station and converts the received service signal into an optical frame. Here, the service signal is a signal using a communication standard such as WCDMA (Wideband Code Division Multiple Access), Wi-Fi (Wireless-Fidelity), LTE (Long Term Evolution)

The master unit 100 converts an electrical signal converted into an optical frame into an optical signal and transmits the converted optical signal to the hub unit 200 through an optical cable. The master unit 100 receives an optical signal transmitted from the hub unit 200 through an optical cable, converts the optical signal into an electrical signal, converts the converted signal into an optical reframe, ) (Not shown).

The master unit 100 is configured by additionally installing new master units 100-2 and 100-3 in the existing master unit 100-1. Here, each master unit 100 supports one or more services. For example, the existing master unit 100-1 transmits and receives WCDMA signals, the first new master unit 100-2 transmits and receives WCDMA signals and LTE signals, and the second new master unit 100-3 receives LTE Signal and an LTE-A signal.

The hub unit 200 is connected to one or more master units 100 and receives an optical signal transmitted from the connected master unit 100 to generate a frame of a first capacity and multiplexes the generated frames of the first capacity And transmits the generated frame to the remote unit 300.

2, the hub unit 200 includes an optical interface 210, a first frame configuration and a framer / reframe 220, a first physical layer interface (PHY interface) 230, 1 < / RTI >

The optical interface 210 receives an optical signal transmitted through an optical cable and converts the optical signal into an electrical signal, converts the electrical signal input from the first frame configuration and reconfiguration unit 220 into an optical signal, Unit 100 of FIG.

The first frame configuration and reconfiguration unit 220 converts the electrical signals output from the optical interface 210 into optical frames to generate a first capacity frame (subframe). The first frame configuration and reconfiguration unit 220 reproduces the frame of the second capacity by multiplexing frames of the first capacity generated from the signals transmitted from the respective master units 100. [ Here, the frame of the first capacity is a 1 Gbps frame, and the frame of the second capacity is a 10 Gbps frame composed of 10 frames of the first capacity.

The first frame configuration and reconfiguration unit 220 demultiplexes a signal transmitted from the first physical layer interface 230 and separates a second capacity frame into a first capacity frame. The first frame configuration and reconfiguration unit 220 sums the frames of the first capacity, which are separated from each other, by the same service signal, and then frames the optical frames to the optical interface 210.

The first physical layer interface 230 transmits the regenerated second capacity frame to the remote unit 300 and receives the second capacity frame transmitted from the remote unit 300. Here, the first physical layer interface 230 transmits / receives the second capacity frame through the 10Gbps physical channel.

The first control unit 240 controls the overall operation of the hub unit 200 by controlling the operation of each component constituting the hub unit 200.

The remote unit 300 receives the second capacity frame transmitted from the hub unit 200 and separates the first capacity frame into the first capacity frame and transmits the separated first capacity frame to another remote unit 300-1, 300-2) or directly provides the service.

The remote unit 300 is connected to the hub unit 200 via one 10G UTP (Unshielded Twisted Pair) cable. Here, 10G UTP cable is about 1.5 times more expensive than CAT-5 UTP cable with CAT-6 UTP cable, but material cost and installation cost are saved than using many CAT-5 UTP cables. The remote unit 300 proposed in the present invention is connected to the existing remote unit 300-1 and the new remote unit 300-2 via the 1G UTP cable and is connected to the existing remote unit 300-1 and the new remote unit 300-2. Since the unit 300-2 is connected at the same position, the construction cost is reduced. Here, a 1G UTP cable is a CAT-5 UTP cable.

3, the remote unit 300 includes a second physical layer interface 310, a second frame configuration and reconfiguration unit 320, a converter 330, a third physical layer interface 340, (350).

The second physical layer interface 310 is connected to the first physical layer interface 230 through one UTP cable and receives a second capacity frame transmitted from the hub unit 200. In other words, the second physical layer interface 310 receives a signal that the hub unit 200 multiplexes service signals transmitted from one or more master units 100 and transmits the multiplexed service signals through one UTP cable.

The second frame configuration and reconfiguration unit 320 generates a first capacity frame by demultiplexing the second capacity frame transmitted from the second physical layer interface 310 and outputs the converted first capacity frame to the converter 330 or the third physical layer interface 340 And generates a second capacity frame by multiplexing the first capacity frames.

The second frame configuration and reconfiguration unit 320 includes a buffer (not shown) for alignment among the first capacity frames. In other words, the second frame configuration and reconfiguration unit 320 aligns the first capacity frames based on the Frame Alignment Signal (FAS) included in the first capacity frame. Here, the first capacity frame is synchronized with the Sync-E function, so that no separate synchronization operation is required.

The converter 330 is for a radio frequency module (RFM) 400, and includes an analog-to-digital converter (ADC) 331 for converting an analog signal into a digital signal, And a digital-to-analog converter (DAC)

The third physical layer interface 340 provides a physical channel of a different capacity to the second physical layer interface 310. Here, the second physical layer interface 310 provides a physical channel of 10 Gbps, and the third physical layer interface 340 provides a physical channel of 1 Gbps. The third physical layer interface 340 serves to interface between the existing remote unit 300-1 and the new remote unit 300-2. The third physical layer interface 340 uses a serial Gigabit Media Independent Interface (SGMII) or a Gigabit Media Independent Interface (GMII) in an interface manner.

4 is a block diagram showing a detailed configuration of the second physical layer interface shown in FIG.

The second physical layer interface 310 uses a 10 Gbps serial interface type XAUI (10 Gigabit Attachment Unit Interface). However, the present invention is not limited to this. For example, a 10 Gbps parallel interface type XGMII (10 Gigabit Media Independent Interface) or a 10 Gbps serial interface type XFI (10-Gbps chip-to- chip electrical interface).

The second physical layer interface 310 needs to be converted into a parallel signal for logical processing such as a framer. That is, the second physical layer interface 310 converts the XAUI signal, which is a 10 Gbps serial signal, into an XGMII signal, which is a 10 Gbps parallel signal. In the present embodiment, an XAUI signal is converted into an XGMII signal. However, the present invention can be implemented using an XFI as an interface method. In this case, the second physical layer interface 310 converts the XFI signal into the XGMII signal.

The second physical layer interface 310 maps the GMII signal, which is a 1 Gbps parallel signal used in the third physical layer interface 340, to the XGMII signal.

The operation of the second physical layer interface 310 will now be described.

First, a 1 Gbps frame is generated through a 1 Gbps UTP framer 311 on the signal sampled through the ADC 331.

The second physical layer interface 310 uses a DPRAM (Dual Ported Random Access Memory) 312 having a buffer for generating a 10 Gbps frame with the generated 1 Gbps frame.

The XGMII interface 314 maps each 1 Gbps frame by the XGMII scheme. At this time, a memory controller (read / write controller) 313 controls each 1 Gbps frame for XGMII mapping.

The XGMII / XAUI conversion unit 315 converts the XGMII data into XAUI data, which is serial data, for the 10 Gbps physical layer interface 310.

Here, the 1 Gbps frame data has a data width of 8 bits (8 bits) in the form of GMII data. Since the XGMII data format has a 64-bit data width, it is necessary to map each 1 Gbps frame to XGMII. Therefore, 10 1-Gbps subframes of 8-bit data are mapped to each 8-bit sub data from 64-bit data of XGMII.

Hereinafter, the operation of the in-building mobile communication relay system according to the present invention will be described according to the signal flow direction.

<Forward signal flow>

Each master unit 100 receives a service signal transmitted from a base station, converts the service signal into an OPTIC frame, and converts the optical signal into an optical signal. Then, the master unit 100 transmits the converted optical signal to the hub unit 200 through an optical cable.

The hub unit 200 receives an optical signal transmitted from each master unit 100, converts the received optical signal into an electrical signal, optically frames the converted electrical signal, and generates a frame of a first capacity . That is, the hub unit 200 separates the service signal transmitted from each master unit 100 from the received optical signal to generate a 1 Gbps frame. Multiplexes the 1 Gbps subframes generated from the service signal received by each master unit 100 and regenerates them into a frame of the second capacity (10 Gbps).

The hub unit 200 transmits the frame of the second capacity to the remote unit 300 via the physical layer PHY of the second capacity (10 Gbps).

The remote unit 300 synchronizes with the hub unit 200 through the Sync-E function and extracts ten first capacity frames in the second capacity frame. And transmits each first capacity subframe to each remote unit 300 for the corresponding service through the physical layer interface of the first capacity.

In addition, the remote unit 300 provides a service through the wireless module 400 after framing a first capacity of a service signal.

<Reverse signal flow>

The existing remote unit 300-1 and / or the new remote unit 300-2 generates a frame of the first capacity as a service signal transmitted from a user terminal (not shown), and transmits the generated frame of the first capacity To the remote unit 300 through the third physical layer interface 340 of the first capacity.

The remote unit 300 subframes the frame of the first capacity received from the remote units 300-1 and 300-2 for each lower service and regenerates the frame of the second capacity into the frame of the second capacity, 2 &lt; / RTI &gt; physical layer interface &lt; RTI ID = 0.0 &gt; 310. &lt; / RTI &gt;

The second capacity frame transmitted from the remote unit 300 to the hub unit 200 is remapped and added to the same service signal for each port of the hub unit 200. [ Then, the hub unit 200 converts the summed service signal into an optical frame, converts the optical framed electrical signal into an optical signal, and transmits the optical signal to the master unit 100 of each service.

Each master unit 100 receives an optical signal transmitted from the hub unit 200, converts the received optical signal into an electrical signal, converts the converted electrical signal into optical frames, and provides a service through a wireless interface.

100: Master unit
100-1: Existing master unit
100-2, 100-3: New master unit
200: Hub unit
210: Optical interface
220: first frame configuration and reconstruction unit
230: first physical layer interface
240: first control unit
300: remote unit
300-1: Existing remote unit
300-2: New remote unit
310: second physical layer interface
320: second frame configuration and reconstruction unit
330: Converter
340: third physical layer interface
350: second control section
400: wireless module

Claims (7)

A master unit 100 for converting an electrical signal obtained by optical-frame-converting a service signal into an optical signal,
And a multiplexer for multiplexing the generated frame of the first capacity and regenerating the frame of the second capacity into a frame of the second capacity, A hub unit 200 for transmitting data via the hub 200,
And a remote unit (300) for synchronizing with the hub unit (200), demultiplexing the regenerated frame of the second capacity into a frame of the first capacity, and servicing the separated frame of the first capacity,
The hub unit 200 provides an interface for interconnection with an existing master unit and a new master unit,
Wherein the remote unit (300) provides an interface for interconnecting the existing remote unit (300-1) and the new remote unit (300-2). The method according to claim 1,
The hub unit (200)
An optical interface 210 for receiving the converted optical signal and converting the optical signal into an electrical signal and converting the electrical signal to an optical signal,
Generating a first frame of capacity after converting the converted electrical signal into a photo-frame, multiplexing the frame of the first capacity to generate a frame of the second capacity, or demultiplexing the frame of the second capacity, A first frame structure and a reconstruction unit 220 for separating the frame into a first capacity frame,
A first controller 240 for controlling the operation of each component,
And a first physical layer interface (230) for transmitting the generated frame of the second capacity through the physical layer under the control of the first controller (240). The method according to claim 1,
The remote unit (300)
A second physical layer interface 310 for transmitting and receiving a frame of a second capacity to the hub unit 200,
A second frame structure for receiving the frame of the second capacity and demultiplexing the received frame of the second capacity to separate frames of the first capacity or multiplex frames of the first capacity to generate frames of the second capacity And a reconstruction unit 320,
A second controller 350 for controlling the operation of each component,
A converter 330 for converting the separated first capacity frame into a digital signal and transmitting the digital signal through the wireless interface 400 or converting the digital signal received through the wireless interface 400 into an analog signal,
And a third physical layer interface (340) having a capacity different from that of the second physical layer interface (310) and transmitting the separated first capacity frame. The method according to claim 1,
The hub unit includes:
And is connected to the remote unit through one 10G unshielded twisted pair (UTP) cable. Converting one or more master signals into an optical signal by converting the service signal into an optical frame, and transmitting the converted optical signal to the hub unit 200;
Converting the at least one optical signal received by the hub unit 200 into an electrical signal and converting the at least one optical signal into an optical signal,
The hub unit 200 multiplexes the generated first capacity frames and regenerates them as a frame of a second capacity,
The hub unit 200 transmitting the regenerated second capacity frame to the remote unit 300 via the physical layer,
Wherein the remote unit (300) synchronizes with the hub unit (200) and demultiplexes the frame of the second capacity into the frame of the first capacity and serves through an air interface Communication relay method. 6. The method according to claim 5,
Wherein the remote unit (300) transmits the demultiplexed first capacity frame to the other remote units (300-1, 300-2) providing the corresponding service. Receiving a frame of a first capacity generated for a corresponding service signal transmitted from another remote unit by the remote unit;
The remote unit multiplexes the received frame of the first capacity to generate a frame of the second capacity and transmits the generated frame to the hub unit;
Wherein the hub unit frames the frame of the second capacity and sums it with the same service signal for each port,
Converting the summed signal of the hub unit into a light framing, converting the optical framed electrical signal into an optical signal, and transmitting the optical signal to a master unit of each service.

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