KR100311505B1 - Method for entring initial of subscriber unit in Local Multipoint Distribution Service system - Google Patents

Abstract

Local Multipoint Distribution Service (LMDS) system, particularly for the security of the initial registration of the subscriber device of the subscriber device of the local multipoint distributed service system to enable the correct registration procedure It is about a registration method. In the local multi-point distributed service system, the subscriber device initial registration method reads a frequency value recently used by the subscriber device for receiving data provided from the service provider to the subscriber device through the MAC processing unit, and fixes the PL. Step, when receiving the data transmitted from the MAC processing unit, if the synchronization is corrected, the channel is fixed to the corresponding frequency, if the synchronization is not corrected down synchronization frame and uplink time channel broadcasted at regular intervals to the subscriber device Repeating the synchronization matching step until the synchronization between the MAC processing unit and the subscriber device is consistent, extracting an uplink parameter from the message received on the fixed downlink channel, and transmitting frequency, transmission time, and transmission output power value. Adjusting the MAC at the subscriber device Requesting the current date and time to the processing unit; determining whether there is a security circuit, and if there is a security circuit, performing a security setting operation.

Description

Method for entring initial of subscriber unit in Local Multipoint Distribution Service system

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a Local Multipoint Distrivrtion Service (LMDS) system. Particularly, a subscriber device of a local multipoint distributed service system that enables security and enables an accurate registration procedure during an initial registration procedure of a subscriber device. Of the initial registration method.

Local multi-point distributed service is a fixed communication system for multimedia that can provide one-way wireless cabling service and two-way multimedia service by wirelessizing the communication path between the base station and the subscriber. It is a system that can provide rapid service and can be introduced as an infrastructure (infra) for building a wireless network when building a high-speed information communication network.

Hereinafter, a local multi-point distributed service system according to the prior art will be described with reference to the accompanying drawings.

1 is a diagram illustrating a configuration of a local multi-point distributed service system according to the related art, which includes a service provider unit 10, a head-end unit 20, and a base station 30 for providing a service. And a subscriber device (Customer Premises Equipment) 40 for receiving the service.

The service provider unit 10 analyzes and exchanges data of an asynchronous transfer mode (hereinafter, referred to as ATM) cell structure, and exchanges 11 with the general operation state of the subscriber device 40 and Network operation status between the subscriber management system 12 which performs information management and verification operation, and the base station 30 connected to the ATM switch 11 and status information on a wireless channel with the subscriber station. Network management system (Network Management System 13), Public Switched Telephone Network (hereinafter abbreviated as PSTN) 14 for connection with public telecommunication networks, and broadband wireless multimedia communication system. When the wireless subscriber network service is to be provided to the private network, the billing information for the subscriber device 40 and the private exchange 15 interworking with the PSTN 14 and the ATM. In the case of exchanging data between the exchange 11 and the private exchange 15, a network interworking device 16 for matching and interoperating with each other, and an Internet service provider for providing Internet services 17 ) And an Internet gateway 18 that provides ATM-LAN services to the subscriber device 40.

The base station 30 is composed of a hub external unit (HUB ODU) 31 and a directional antenna 32.

The subscriber device 40 is composed of a high-directional antenna 41, a subscriber outdoor unit (42), a network interface unit (NIU) 43, and a peripheral device 44. do.

The peripheral device 44 includes a telephone 44a, a PC 44b, a set top box (STB) 44c, a television 44d, and the like.

FIG. 2 is a diagram illustrating a detailed configuration of the headend unit 20 of FIG. 1. The data is multiplexed on an upstream channel (DownStream CHannel: DSCH) transmitted from the ATM switch 11, or an upstream channel (UpStream CHannel: USCH). Asynchronous mux unit (AMU (ATM MUX UNIT): hereinafter abbreviated as AMU) 21 for demultiplexing the data transmitted to or transmitting ATM cell data, and a downlink channel transmitted from the AMU 21 MAC processing unit for converting data for DSCH into a frame structure that can accommodate multimedia or transmitting data for uplink channel (USCH) and transmitting ATM cell data by protocol promised with AMU 21 ( MPU (MAC Process Unit) 22 and the information data transmitted from the MAC processing unit 22 are packetized in units of 188 bytes, and modulation and channel coding (Convolutional Coding, Convolutional Interleaving, Read Solomon) Multiple M-ary QAM Coding) (Quadrature Amplitude Modulation) / Quadrature Phase Shift Keying (QPSK) modulator 23 and the M-ary QAM / QPSK modulator 23 convert the carrier frequency modulated to one channel between 950 MHz and 2050 MHz, and then amplify it. Downlink channel unit (DUC) 24 and the internal coupling unit for mixing a plurality of downlink channel RF (Radio Frequency) transmitted from the downlink channel unit 24 and transmits it to a coaxial cable ( Indoor Combiner Unit (ICU) 25, an Indoor Divider Unit (IDU) 26 for detecting and distributing an uplink RF signal from the signal transmitted from the base station 30, and the internal distribution unit ( Upstream Channel Unit (UCU) 27 for distributing uplink RF signals transmitted from the plurality of channels to a plurality of channels, and various devices (QAM / QPSK modulators) in the headend unit 20. , Down channel unit (DCU), up channel unit (UCU), power supply unit) And a network management system agency master unit (NMS) 28 for detecting and transmitting data by demodulating the modulated signal at the base station 30 and transmitting the data. It is composed of a power supply unit (Power Surply Unit) 29 that stably supplies power required by various units of (20) or indicates its own operating state.

The network management system agency master unit 28 includes a demodulator 28a for demodulating uplink RF signals transmitted from the internal distribution unit (IDU) 26 to detect data, and in the headend unit 20. Transmitting information demodulated by the demodulator 28a and information on the operation state collected for various devices (QAM / QPSK modulator, down channel unit (DCU), up channel unit (UCU), power supply unit (PSU)) It consists of CPU28b.

3 is a view showing a detailed configuration of the base station apparatus of FIG. 1, an external distribution unit (Outdoor Devider Unit: ODU) 31a for distributing and transmitting an RF modulated signal transmitted from the head end unit 20; Frequency conversion of the signal output from the external distribution unit (31a) into a microwave band and then converted to a high power transmission or at the frequency of the microwave band transmitted from the subscriber unit 40 (Intermeate Frequency) band (400MHz ~ 700MHz First to fourth microwave converters 31b to 31e which are converted to the first to fourth microwave converters 31b to 31e, and the first to fourth microwave converters 31b to 4 so as to have a directivity angle in the four directions. The first to fourth sector antennas 32a to 32d for transmitting or receiving the signals of the IF band converted in step 31e) and the IF bands converted at the first to fourth microwave converters 31b to 31e.An external combiner unit (OCU) 31g which combines calls and transmits them to the head end unit 20 using a coax cable to one output terminal, and supplies power required by each unit. A power supply unit 31h for stably supplying and transmitting its operating state, the first to fourth microwave converters MWC 31b to 31e, and a power supply unit And a network management system agency slave unit 31f that modulates the operation state of 31h) into a digital signal and transmits the modulated signal.

The network management system agency slave unit 31f includes a CPU 31f-1 that aggregates and outputs operating states of the first to fourth microwave conversion units 31b to 31e and the power supply unit 31h, and And a modulator 31f-2 for modulating and outputting the signal transmitted from the CPU 31f-1 to a digital signal.

FIG. 4 is a diagram illustrating a detailed configuration of the subscriber apparatus of FIG. 1, and is a line of sight in order to enable visible distance communication with the first to fourth antennas 32a to 32d of the base station 30. The high-directional antenna 41 and the microwaves transmitted from the first to fourth microwave converters 31b to 31e to the IF band (950MHz to 2050MHz) or to an uplink signal. Subscriber external unit 42 and uplink channel including a microwave conversion section 42a for converting the uplink frequency converted into the IF band (400MHz ~ 700MHz) for the uplink microwave band to amplify the output of 100mW ~ 500mW A specific channel in a downlink frequency band according to a control signal of the CPU / MAC 43a for controlling downlink frequency, formatting data, or processing demodulated data. Or an RF tuner 43b for transmitting a modulated frequency for transmission to the base station 30 and DQPSK-modulated channel coded data according to a control signal of the CPU / MAC 43a to the RF tuner 43b. The DQPSK modulator 43c for transmitting, the M-ary QAM / QPSK demodulator 43d for channel decoding after QPSK demodulation of the data output from the RF tuner 43b, and performing a segmentation & reassembly (SAR) function An ATM interface unit 43e which processes ATM cell data output from the RF tuner 43b and transmits it according to the type of received data or formats and transmits data to be transmitted to the base station 30 in an up-channel frame structure; ATM-processing signal for packet data communication with the peripheral device 44 and the PSTN interface unit 43f for processing a signal for making a telephone call according to the signal transmitted from the ATM interface unit 43e. LAN interface unit (4 Network interface unit (NIU) 43 configured to include 3g), and a peripheral including a telephone 44a, a PC 44b, a set top box (STB) 44c, and a TV 44d. Device 44.

The operation of the local multi-point distributed service (LMDS) system according to the prior art configured as described above will be described with reference to FIGS. 1 to 4.

The head end unit 20 communicates with various devices of the service provider unit 10 and directly processes data sent from the subscriber device 40 or sends data to various devices of the service provider unit 10.

The base station 30 modulates the data sent from the head end unit 20 and transmits it wirelessly, or receives and transmits a radio signal from the subscriber device 40 to the head end unit 20.

Subscriber device 40 is a device in the subscriber's premises that allows subscribers to directly use services such as phone 44a, PC 44b, and TV 44b.

When the subscriber device 40 first applies power to the system, the subscriber device 40 transmits its serial number to the base station 30 and then enters a state of receiving a service.

However, the local multi-point distributed service (LMDS) system according to the prior art has the following problems.

First, there was no countermeasure against data requiring security.

Second, there was no negotiation procedure for accurate adjustment of frequency, output, and synchronization between subscriber device and headend during initial registration.

Third, the exact time synchronization between the head end and the subscriber device could not be maintained, leading to differences in both usage times.

Disclosure of Invention An object of the present invention is to provide an initial registration method of a subscriber device of a local multi-point distributed service system that can be secured and enables an accurate registration procedure.

An initial registration method of a subscriber device of the local multi-point distributed service system of the present invention for achieving the above object is a frequency recently used by the subscriber device for receiving data provided from the service provider to the subscriber device through the MAC processing unit. Reading a value, fixing the PEL, receiving data transmitted from the MAC processing unit and fixing a channel at a corresponding frequency when the synchronization is correct, and if the synchronization is not corrected, the MAC processing unit periodically at the subscriber device Repeating the synchronization matching step until the synchronization between the MAC processing unit and the subscriber device using the broadcast downlink synchronization frame and the uplink time channel, extracting the uplink parameter from the message received on the fixed downlink channel and transmits Adjust frequency, transmit time, transmit output power value And requesting a current date and time from the subscriber device to the MAC processing unit, determining whether there is a security circuit, and performing a security setting operation if there is a security circuit.

Preferably, the downlink sync frame includes a frame start slot for synchronizing with the first time slot, and the frame start slot is configured to synchronize the values of the virtual path identifier / virtual channel identifier with OxFF / OxFFFF of all 1s. do.

The time slot may include a polling slot, a contention slot, and a reserved time slot to prevent a collision when the MAC processor requests a status, requests a time slot allocation from a subscriber device, or transmits time slot information. do.

Preferably, the step of extracting an uplink parameter from the received message and adjusting a transmission frequency, a transmission time, and a transmission output power value may include receiving a MAC message from the MAC processor and sending a serial number of the subscriber device to the MAC processor. Transmitting and transmitting a network interface identification number (niu_id) to be assigned from the MAC processing unit, and the MAC processing unit recognizes that there is a subscriber device attempting to register and assigns one of ids not currently used as a temporary niu_id. Transmitting a message containing a correction value of a transmission frequency, a transmission time, and a transmission output power value of the subscriber device to the subscriber device, and the subscriber processing unit receiving the message readjusts the transmission frequency, transmission time, and transmission output. Retransmission to the processing unit to correctly match the transmission frequency, transmission time, and transmission power. .

According to the present invention as described above, when providing a local multi-point distributed service it is possible to secure the multimedia and improve the reliability of the subscriber to the service provider.

1 is a diagram showing the configuration of a conventional local multi-point distributed service (LMDS) system

FIG. 2 is a diagram illustrating a detailed configuration of the head end of FIG. 1. FIG.

3 is a diagram illustrating a detailed configuration of a base station of FIG.

4 is a diagram showing the detailed configuration of the subscriber apparatus of FIG.

5 is a diagram illustrating a detailed configuration of a subscriber device of a local multi-point distributed service system of the present invention.

6 is a flowchart illustrating the initial operation of the subscriber device of the present invention.

7 is a view for explaining the initial operation of the subscriber device and the head end of the present invention;

8 is a block diagram of a downlink frame in the present invention local multi-point distributed service system

9 is a block diagram of an uplink time slot in a local multi-point distributed service system according to the present invention.

Explanation of symbols for main parts of the drawings

50: subscriber device 51: high-directional antenna

52: subscriber unit external unit 53: network interface unit

54: peripheral device

Hereinafter, a local multi-point distributed service system according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

5 is a diagram illustrating a detailed configuration of a subscriber device of the local multi-point distributed service system of the present invention.

The subscriber device 50 of the present invention as described above has a subscriber device external unit 52 for frequency converting and amplifying input data, and a plurality of data terminals provided in the subscriber device external unit 52 and the subscriber device 50. And a network interface 53 for maintaining the security of data input and output from the subscriber device 50, and a peripheral device including a plurality of data terminals.

In this case, the subscriber unit external unit 52 includes a high directional antenna 51 provided for data communication, and a microwave converter 52a for frequency converting and amplifying the input data.

The network interface 53 controls a channel frequency, formats a data, or processes demodulated data in a downlink frequency band according to a control signal of the CPU / MAC 53a. An RF tuner 53b for transmitting a modulated frequency for selecting a specific channel or for transmitting to a base station 30 as shown in FIG. 1, and channel coded data according to a control signal of the CPU / MAC 53a. DQPSK modulator 53c for DQPSK modulation and transmitting to the RF tuner 53b, M-ary QAM / QPSK demodulator 53d for channel decoding after QPSK demodulation of data output from the RF tuner 53b, and SAR (Segmentation & Reassembly) function and processes the ATM cell data output from the RF tuner 53b to transmit according to the type of received data or to format the data to be transmitted to the base station 30 in an uplink frame structure. Transmitting ATM interface unit 53e, a PSTN interface unit 53f which processes a signal to make a telephone call according to the signal transmitted from the ATM interface unit 53e, and a peripheral device 54 for packet data communication. And an ATM-LAN interface unit 53g for processing signals, and a security module 53h for encrypting data during transmission and reception.

The operation of the subscriber device of the local multi-point distributed service system according to the present invention will be described.

The subscriber device of the local multi-point distributed service system allows the high-directional antenna 51 to be able to perform visible distance communication with the first to fourth antennas 32a to 32d of the base station 30 as shown in FIG. It is installed to be in the line of sight state in order to transmit and receive data with the microwave converter 52a, wherein the microwave converter 52a is the first to fourth microwave as shown in FIG. By converting the microwaves transmitted from the MicrwWave Converters 31b to 31e into the IF band (950 MHz to 2050 MHz) or the up channel frequency converted into the IF band (400 MHz to 700 MHz) for the uplink signal to the up microwave band. Amplify with 100mW ~ 500mW output.

In addition, the CPU / MAC 53a controls uplink / downlink frequency, formats data, processes demodulated data, and the RF tuner 53b operates in a downlink frequency band according to a control signal of the CPU / MAC 53a. In order to select a specific channel or to transmit the modulated frequency to transmit to the base station (30).

In addition, the DQPSK modulator 53c also DQPSK modulates the channel coded data according to the control signal of the CPU / MAC 53a to the RF tuner 53b, wherein the M-ary QAM / QPSK demodulator 53d QPSK demodulates or decodes the data output from the RF tuner 53b.

In addition, the ATM interface unit 53e performs a segmentation & reassembly (SAR) function and processes ATM cell data output from the RF tuner 53b for transmission according to the type of received data or to transmit to the base station 30. Format the data into an uplink frame structure and transmit the data to the PSTN interface unit 53f, and process the signal so that the PSTN interface unit 53f can make a telephone call according to the signal transmitted from the ATM interface unit 53e. do.

At this time, the ATM-LAN interface unit 53g processes a signal for packet data communication with the peripheral device 54.

In addition, the security module 53h may maintain security when data is transmitted and received between the subscriber device 50 and the service provider unit 10.

In addition, security module 53h includes disabling data or programs to be used by unauthorized users.

For example, a password may be registered with the subscriber's authority in a software manner and made available for use in initiating a data set, or with special encryption to transmit and receive data.

FIG. 6 is a flowchart for explaining an initial operation of the subscriber device of the present invention, FIG. 7 is a view for explaining an initial operation of the subscriber device and the head-end unit of the present invention, and FIG. 8 is a downlink frame diagram of the present invention. 9 is a configuration diagram of the uplink time slot of the present invention.

At this time, the method of mutual operation between the network interface unit 53 of the barometer device 50 and the pulse processing unit (MPU) 22 of the head end unit 20 will be mainly described.

The MAC processing unit 22 of the head-end unit 20 is a device located between the switch and other servers and the subscriber device to establish mutual communication paths and send control data. It should be subscribed to the service provider and the RF communication between the subscriber device 50 and the MAC processing unit 22 should be made normally and the protocols of each other should be the same.

First, the initial operation of the subscriber device is powered on the subscriber device, and if the power of all the equipment of the subscriber device is stabilized, first check whether there is a security circuit (501) (601). At this time, the security circuit is a circuit having a security function that makes it impossible to know the contents even when tapped on the radio or the track.

After checking the security circuit, the channel reads the value of the most recently used frequency from the memory where the frequency is stored and fixes the phase locked loop (PLL), and the data (control data, audio, video) transmitted from the processing unit E.g. Internet data transmission).

If synchronization is correct, use this channel to lock the frequency and go to the next step. At this time, the MAC processing unit (MPU) broadcasts to all the subscriber equipment about the state of the downlink channel synchronization and the uplink time slot at periodic intervals.

In this case, the downlink channel frame and the uplink time slot will be briefly described with reference to FIGS. 8 and 9, and FIG. 8 is an example of a downlink frame diagram. In FIG. 8, a plurality of time slots are provided in one downlink frame. In this case, the first time slot is the Frame Start slot.

Downlink synchronization sends all the values of the Virtual Path Identifier / Virtual Channel Identifier (VPI / VCI) at the start of the frame to OxFF / OxFFFF (1) so that all network interface units can synchronize. .

This message periodically informs all network interfaces from the Mac processor of the current uplink time slot status. There are three time slots that the network interface can transmit upward.

An example of such an uplink time slot will be described with reference to FIG. 9.

9 illustrates an uplink time slot, for example, three polling time slots, 11 contention time slots, and 66 reserved time slots.

Time slots include polling time slots that periodically respond when the Mac processor asks for status, and contention contention that may conflict when the network interface requests time slot allocation or sends other information to the Mac processor MCU 22. ) Time slot, and a reserved time slot that is assigned to only one network interface NIU 13 and can be used only by the network interface NIU 13.

If the synchronization is not consistent, the next frequency value is read from the memory, the PLL is fixed, and the above operation is repeated until the synchronization is performed (502) (602).

If the synchronization is correct (603), the network interface unit receives and analyzes a MAC (MAC) message from the MAC processor to obtain a transmission parameter for an uplink time slot (503) (604).

The network interface section starts transmitting after fixing the transmission frequency to an available contention time slot obtained from this message. At this time, the network interface unit sends a niu_id to be assigned from the MAC processing unit according to the service number and later service class when it is produced at the factory as 0 (temporary number) (605).

In this case, the contention time slot does not use only a specific network interface unit, but conflicts may occur because several other network interface units may use the same time. If there is no response to the transmitted data for a certain period of time, the network interface unit recognizes that a collision has occurred and then waits for that amount using the random transmission delay method and transmits again.

The MAC processor analyzes the message and can see that the network interface powers on and attempts to register.

After receiving the message, the MAC processor assigns one of the ids not currently being serviced to the network interface unit as a temporary nid_id, and sends correction values of the transmission frequency, transmission time, and transmission output power of the network interface unit (504). (614).

The network interface unit receiving the message retransmits by adjusting a transmission frequency, a transmission time, a transmission output, etc. using the temporarily allocated niu_id.

The MAC processing unit continues the operation until the signal from the network interface unit is correct. Subsequently, if the signals match exactly, the Mac processor sends a completion message (615).

The network interface then asks the Mac processor for the current date and time in order to use it for various purposes, such as accurate synchronization and security (505) (607).

The MAC processor knows the exact time and sends an answer (616).

Subsequently, it is determined whether there is a security circuit that is first inspected after the time setting 608 is finished (106).

In this case, if there is a security circuit, a security setting operation is performed (507). If there is no security circuit, the next step is to register (508).

The network interface unit uses its niu_id again to request registration permission by transmitting the minimum parameters related to service level, availability and other services. (508) (601).

The MAC processing unit sends the serial number of the network interface unit and the requested service level to the subscriber management unit 12 to request confirmation (617).

The subscriber management unit 12 searches whether the serial number of the network interface unit is in a list in the device, and if the service manager has a service class capable of receiving all the requested services, informs the MAC processor of the result again (618).

The Mac processor sends it back to the network interface. If the subscriber management unit 12 is not registered or there is a service disqualification reason such as double use or overdue fee, a denial of service response may be sent.

If the normal user's network interface unit receives a license (611) and can use the requested service from this time. The network interface unit waits for the user's input and waits for a polling message every predetermined time from the Mac processor to send a response thereto to maintain synchronization with each other (509, 612).

The present invention as described above has the following effects.

First, you can protect data that requires security.

Second, since the negotiation procedure for accurate adjustment of the frequency, output, synchronization, etc. between the subscriber device and the head-end at the initial registration is provided, accurate initial operation is possible.

Therefore, even if the exact time synchronization between the head end and the subscriber device is not maintained, the difference in both usage times can be eliminated, thereby providing a reliable local multi-point distributed service system.

Claims (4)

Reading a frequency value recently used by the subscriber device for receiving data provided from the service provider to the subscriber device through the MAC processing unit and fixing PEL; When receiving data transmitted from the MAC processing unit, if the synchronization is corrected, the channel is fixed at the corresponding frequency. If the synchronization is not corrected, the downlink synchronization frame and the uplink time channel broadcasted at regular intervals by the MAC processing unit are used. Repeating the synchronization matching steps until the synchronization between the pulse processor and the subscriber device is consistent; Extracting an uplink parameter from a message received on the fixed downlink channel to adjust a transmission frequency, a transmission time, and a transmission output power value; Requesting a current date and time from the subscriber device to a MAC processor; Determining whether there is a security circuit, and if there is a security circuit, performing a security setting operation. The method of claim 1, The downlink synchronization frame includes a frame start slot for synchronizing with the first time slot, and the frame start slot synchronizes the values of the virtual path identifier / virtual channel identifier to OxFF / OxFFFF of all 1s. Initial registration of subscriber device in local multipoint distributed service system. The method of claim 2, The time slot consists of a polling slot, a contention slot, and a reserved time slot to prevent collisions when the MAC processing unit asks for status, requests a time slot assignment from a subscriber device, or transmits time slot information. A subscriber device initial registration method in a local multipoint distributed service system. The method of claim 1, The step of extracting an uplink parameter from the received message and adjusting a transmission frequency, a transmission time, and a transmission output power value may include receiving a MAC message from the MAC processor and transmitting a serial number of the subscriber device to the MAC processor. Transmitting a network interface identification number (niu_id) to be allocated from the MAC processing unit, and the MAC processing unit recognizes that there is a subscriber device attempting registration and assigns one of ids not currently used as a temporary niu_id to the subscriber. Transmitting a message containing a correction value of a transmission frequency, a transmission time, and a transmission output power value of the device to the subscriber device, and the subscriber processing unit receiving the message readjusts the transmission frequency, transmission time, and transmission output to the MAC processing unit. Retransmission to correctly match the transmission frequency, transmission time, and transmission power. User devices an initial registration process of the local multi-point distribution services system, characterized in that.