KR100258641B1 - The interface board for voice-band service via b-will in the terminal equipment for group subscribers - Google Patents

Abstract

PURPOSE: A B-WLL(Broadband Wireless Local Loop) interface unit for connection with a broadband bidirectional wireless communication network in a collective terminal is provided to execute access between a base station and a collective terminal in a TDMA(Time Division Multiple Access) method and to offer voiceband data communication service, as well as voice service, to group subscribers. CONSTITUTION: A B-WLL interface unit consists of an RF unit(12), B-WLL modems(15), a processor(17), a time switch board interface unit(16), an IF combiner(13), and an IF unit(14). The RF unit(12) converts an RF signal received through an antenna into an IF signal or converts an IF signal inputted from the IF combiner(13) into an RF signal. The B-WLL modems(15) executes digital signal processing, such as A/D conversion, D/A conversion, channel coding/decoding to correct errors, interleaving/deinterleaving, modulation/demodulation, etc. The IF unit(14) executes up-conversion/down conversion to convert an IF band signal inputted from the IF combiner(13) into a B-WLL modem part input signal. The IF combiner(13) combines the output of the IF unit(14) and transmits the combined signal to the RF unit(12). The processor(17) executes a function to set up, maintain or release the connection between a collective terminal and a base station using a TDMA method.

Description

BWLL Matching Device for Access to Broadband Bi-directional Wireless Network in Group Terminal Devices

The present invention is a group terminal device for providing voice services, voice band data services and high-speed data services for group houses such as apartment complexes and large buildings in broadband two-way wireless communication networks or cable TV networks ranging from several GHz to tens of GHz. A method of constructing a B-WLL matching device for accessing a broadband bidirectional wireless communication network. The subscribers do not use an additional device in each home and use a telephone, a fax, a modem, and a cordless phone in the same manner as the conventional method. General subscriber terminal devices such as phone) and PC can be used to receive services.

In general, existing subscriber terminal devices provide voice and data communication services to users by using wired telephone networks connected to each house, which leads to difficulties in initial investment and facility maintenance, and high speed data due to narrowband characteristics of wired telephone networks. I have difficulty getting service. In addition, in the case of broadband two-way wireless communication network in the range of several GHz to several tens of GHz, in the past, antennas and set top boxes (STBs) are installed in each home to interface with general subscriber terminal devices. It is difficult to manage antennas and STBs, and the cost burden is great. In terms of radio wave environment, most antennas are located indoors or outdoors in low areas. Therefore, they may not satisfy the LOS (Line of sight) environment, which may raise the problem of providing the same quality service as the wired base station. Either increase the number or install additional repeaters. In the case of using a collective terminal device, it is possible to provide a better quality service by installing an antenna on a rooftop, which is a location that satisfies the base station and the LOS environment. Voice and voice band data services can be provided by the method.

Therefore, the present invention is located in the middle of the subscriber terminal devices in densely populated areas, such as base stations and apartments of a broadband two-way wireless communication network, and connects between the base station and the collective terminal devices in a time division multiple access (TDMA) manner. In addition to voice services in existing cellular systems, voice band data communication services such as FAX and modem can be provided to group subscribers. It is possible to use the radio resources more efficiently by providing aggregation cost in broadband two-way wireless communication group terminal device, and at the same time, it is configured by using one or more BWLL modem parts to handle traffic of group subscribers. It should be possible to establish a communication path to each subscriber. In addition, it provides a method of configuring a B-WLL matching device using an IF combiner to combine signals output from multiple modem units and process them through a single RF unit. The present invention proposes a method of establishing a communication path for a network and allocating a radio resource channel between a base station and a terminal device.

1 is a block diagram of a collective terminal apparatus including a matching device according to the present invention, which is a wireless local loop of 2.3 GHz band, a broadband wireless local loop of 26 GHz band, and a cable subscriber network. It consists of RF unit, matching device, switch unit, subscriber line interface unit, main control unit, and power unit which can be connected to the transmission media and can be connected to the MDF (Main Distribution Frame) in group houses such as apartments or large buildings. It is a block diagram of a terminal device.

2 is a detailed block diagram of a BWLL matching device proposed by the present invention for connecting a collective terminal device to a wideband wireless subscriber network. An RF unit, an IF unit, an IF combiner, N BWLL modem units, a processor, and a switchboard are shown in FIG. It consists of an interface unit.

3 is a flowchart of a call channel setting method for establishing a call channel and allocating radio resources in a B-WLL matching device.

* Explanation of symbols for main parts of the drawings

1: B-WLL RF unit 2: B-WLL signal processing unit

3: CATV RF unit 4: CATV signal processing unit

5: WLL RF unit 6: WLL signal processing unit

7: time switch unit 8: subscriber line interface

9: Main control part 10: Power part

11: MDF part 12: RF unit

13: IF combiner 14: IF unit

15: modem unit 16: switchboard interface unit

17: processor unit

In order to solve the above problems, the present invention, an RF unit for processing a B-WLL RF signal for connection with a wideband bidirectional wireless subscriber network in a collective terminal device of a wideband bidirectional wireless communication network for voice band service, and the RF unit An IF combiner that separates the IF signal output from the IF unit or combines the output of the IF unit and transmits it to the RF unit, and down-converts the IF band signal output from the IF combiner or converts the B-WLL signal from the subscriber side into the IF band. An IF unit for up-converting the signal, an A / D conversion or D / A conversion, a channel encoding or decoding, and a modulation / demodulation function to process a digital signal, the modem unit and an external time switch unit and an interface Management of the device by performing the switchboard interface unit, channel resource allocation, release control, and call processing for the modem It is composed of a processor to perform the control and communication with the outside.

EMBODIMENT OF THE INVENTION Hereinafter, based on drawing, embodiment of this invention is described in detail.

1 is a block diagram of a group-type terminal device that can be connected to a broadband two-way wireless communication network, a cable network, and a wireless subscriber network to simultaneously accommodate different transmission media and provide a service, or to communicate using one or two transmission media. Can provide services. A group terminal device that must share a limited number of wireless or wired resources can provide aggregation costs for the efficient use of these wired and wireless resources, and sufficient redundancy and mutual transfer to improve the reliability of communication services. Functions and functions for operation and maintenance are implemented, and it is designed to be appropriately expanded to meet the demands of subscribers.

The collective terminal apparatus includes a B-WLL RF unit (1), a CATV RF unit (3), a WLL RF unit (5), a BWLL signal processor (2), a CATV signal processor (4), a WLL signal processor (6), a main control The unit 10, the time switch unit 7, the power supply unit 9, the subscriber line interface unit 8 and the like.

The B-WLL RF unit 12 converts an RF signal of several tens of GHz to an IF signal received from the antenna or converts an IF signal input from an IF combiner into an RF signal of several GHz to several tens of GHz through an antenna. Transmit to base station.

IF combiner 13 and IF unit 14 of the B-WLL RF unit 1 combine the signals output from the multiple BWLL modem units as appropriate and transmit them to the RF unit or distribute the signals from the RF unit to each modem unit. By enabling the use of a single RF unit is possible.

The B-WLL signal processing section 2 is composed of a BWLL modem section 15, a process 17, a time switch board interface section 16, and the like, and is a time-division multiple access connection between a collective terminal apparatus and a base station in a broadband bidirectional wireless network. It uses TDMA to establish, maintain, and release the connection between the group-type terminal apparatus and the base station. It also performs call connection and control functions to enable circuit-switched service between subscribers. That is, the BWLL signal processing unit performs a down conversion function / up conversion function on a signal input from the B-WLL RF unit 1 and converts an analog signal into a digital signal. Digital signal processing includes D / A conversion for converting digital signals into analog signals, channel encoding and decoding for correcting errors that may occur on a wireless channel, interleaving / deinterleaving, and modulation / demodulation functions for transmitted and received signals.

The CATV RF unit 3 processes RF signals of uplink and downlink channels of a terminal device of a cable subscriber network system using a CATV network.

The CATV signal processor 4 is connected to the headend of the cable subscriber network system to perform a modulation / demodulation function, a MAC protocol control for channel resource setting and release management, and an outgoing call processing function.

The WLL RF unit 5 converts a signal received from an antenna that transmits and receives a signal between a base station and a collective terminal device of a wireless subscriber network system operating in the 2.3 GHz band to a baseband signal that can be processed by the WLL signal processing unit. And it converts the baseband signal output from the WLL modem unit into the RF signal of 2.3GHz band and outputs it to the antenna.

The WLL signal processor 6 includes an A / D converter, a D / A converter, a WLL-CDMA modem, a timing generator, a transcoder, a processor, and a memory. A / D conversion, D / A conversion, code synchronization and PN spreading / despreading, interleaving / deinterleaving, convolutional coding / bitterbit decoding are performed on the signal to perform demodulation on the signal. The transcoder performs voice compression and reconstruction to efficiently use radio resources.

The time switch unit 7 may provide a concentrating ratio of N: M to facilitate the efficient use of radio resources and the configuration of the collective terminal apparatus according to the subscriber. In this case, N is the maximum number of lines that can be simultaneously provided by the group terminal device, and M is the number of subscribers connected to the group terminal device. The value of N: M may be set to N = M or N <M according to the traffic characteristics of the user. The information on each subscriber is stored in the memory of the main controller, and when a corresponding call occurs, the subscriber performs a switching function for establishing a communication path to the subscriber.

The subscriber line interface board 8 is composed of a PCM codec, a subscriber line interface circuit, a ring / tone generator, and the like, and is connected to an MDF 11 in a group house such as an apartment, In office or office, you can connect with general analog terminal device by using RJ-11 connection port. The ability to supply a constant call current to the subscriber line, and to monitor the hook on / off state of the telephone by monitoring the impedance value at this time, and that the signal is being received at the subscriber terminal device. Ring genrator function to inform, and various kinds of signal tones such as dial tone, ring tone, and busy tone for call processing service, and monitoring of line abnormality when analog line matching with subscriber terminal equipment Perform line status monitoring.

The PCM codec encodes a voice signal input from a subscriber line interface circuit into 64 Kbps PCM digital data or decodes digital voice data from a base station into a voice signal.

The present invention relates to a B-WLL RF unit 1 and a B-WLL signal processing unit 2 for accessing a BWLL network, which is a broadband bidirectional wireless subscriber network, in the group terminal device configured as described above.

2 is a block diagram of a B-WLL matching device for accessing a broadband bidirectional wireless subscriber network in a collective terminal device. A processor for controlling an RF unit 12, N BWLL modem units 15, and N BWLL modem units. A unit 17, a timing generator, a time switch board interface unit 16, an IF combiner 13, an IF unit 14, and the like, are used for time-division multiple access between a group terminal device and a base station in a broadband bidirectional wireless network. It uses TDMA to establish, maintain, and release the connection between the group-type terminal apparatus and the base station, and performs call access and call processing functions to enable circuit switching services between subscribers.

The RF unit 12 includes an antenna for transmitting and receiving a signal to and from a base station of a broadband bidirectional wireless subscriber network, a transceiver for providing a separate path when transmitting and receiving between a base station and a group terminal device, and a signal for transmitting and receiving a signal by processing a group terminal device signal. It consists of a transmitter that transmits to the antenna through the excavation, a receiver that receives and processes the signal from the antenna through a transceiver, and a local oscillator for up-and-down conversion, and it receives IF signals from several GHz to tens of GHz. It converts the signal into an IF unit consisting of an IF combiner and an IF unit or converts an IF signal input from the IF unit into an RF signal of several GHz to several tens of GHz and transmits it to the base station through an antenna.

The IF unit 14 converts a signal input from the BWLL modem section into an IF band, or converts an IF band signal input from the IF combiner 13 into a B-WLL modem section input signal. To perform. The IF combiner 13 splits the signal input from the RF unit into the IF unit, or combines the outputs of the IF unit and transmits it to the RF unit 12. Therefore, communication with the base station is possible using a single RF unit and an antenna.

The B-WLL modem unit 15 performs A / D conversion for converting an analog signal into a digital signal, D / A conversion for converting a digital signal into an analog signal, and channel encoding / decoding for correcting errors that may occur on a wireless channel. It performs digital signal processing such as interleaving / deinterleaving, modulation and demodulation function for transmission and reception signals. In the embodiment, the B-WLL modem unit may be implemented by implementing each modem on a board or by integrating several modems on one board. The state and operation of each modem of the B-WLL modem unit 15 composed of several modems are controlled by the processor unit 17.

The B-WLL modem unit 15 sends the subscriber's voice data input from the time switch unit 7 to the time slots allocated by the processor 17 unit, and sends the subscriber's voice data to the time slots allocated from the base station, or from among the data transmitted from the base station. Detects data carried in the slots assigned to the subscriber and transmits the data to the time switch unit 7 according to the path set by the processor.

The processor 17 controls the MAC protocol for establishing, maintaining, and releasing a connection between the collective terminal apparatus and the base station using a time division multiple access method (TDMA) between the collective terminal apparatus and the base station in a broadband bidirectional sub-network. By using the function, each slot is allocated a time slot to each subscriber, and call connection and call processing are also performed to enable circuit switching service between subscribers. It also performs a function of reporting the status of each modem, such as whether the main controller 10 is busy or idle.

In order for subscribers to communicate with each other using a broadband two-way wireless communication network, a wireless channel must be established between a base station and a group terminal device. The processor 17 can transmit a BWLL modem 15 ) Detects the idle channel or modem in the idle state and performs the call channel setup procedure.

3 is a flowchart illustrating a communication channel setting method. When a B-WLL matching device is mounted in a group-type terminal device of a broadband bidirectional wireless communication network, an initialization procedure for communicating with a base station is performed. At this time, the B-WLL matching device receives the information and the synchronization information for the base station and is in an idle state waiting for an incoming call to the subscriber.

The call channel setting method is a radio resource allocation procedure for allocating and releasing radio resources for incoming and outgoing calls to subscribers connected to the broadband bidirectional collective terminal device and the B-WLL modem unit in the collective terminal device. %), A call channel assignment procedure for establishing a call path by connecting a subscriber terminal device through a time switch unit 7 and a subscriber line interface unit 8, and a call established through a radio resource assignment procedure and a call channel assignment procedure It consists of a call processing procedure using a furnace.

The call channel assignment procedure is to set up the subscriber's call path in the collective terminal device. When an incoming call is received for a subscriber connected to the collective terminal device through a signal channel, or when the subscriber's call originates, When the hook-off signal is detected, the B-WLL modem first searches for an idle channel in the currently operating modem when using a multi-line modem capable of serving a plurality of subscribers from one modem. If the idle channel exists, the radio resource channel allocation procedure is performed by transmitting a channel request signal to the base station through the modem in which the idle channel exists. If there is no idle channel, the processor searches for the BWLL modem in idle state. In case of an incoming call, when the subscriber to be received is busy, the subscriber informs the busy state through the signaling channel. The idle BWLL modem refers to a state in which base station information and synchronization information are acquired.

The radio channel allocation procedure is a procedure of allocating and releasing timeslots to be used by a subscriber by using time division multiple access (TDMA) for accessing a base station and a collective terminal device of a broadband bidirectional wireless subscriber network.

In the case of outgoing call, the main control unit that detects the hook off of the subscriber uses a multi-line modem that can serve multiple subscribers from one modem. First, the idle channel is first applied to the modem in the B-WLL matching device. Search. If the idle channel exists, the radio resource channel allocation procedure is performed by transmitting a channel request signal to the base station through the modem in which the idle channel exists. If the idle channel does not exist in the currently operating channel, the modem is searched for the idle state and the radio resource allocation procedure is performed. The processor sends a channel request signal to the base station to allocate the radio resource using the MAC protocol, and the base station allocates the radio resource using the channel assignment signal if an available radio resource exists. The processor assigned the radio resource activates the modem in the idle state and establishes a communication path with the base station.

When the radio resource is allocated through the radio resource allocation procedure, the subscriber information is used to set the value of the control memory of the time switch unit to perform a switching function to the activated B-WLL modem 15 and assign it by the radio channel allocation procedure. The established time slot is used to establish a call path with the base station.

When there are no radio resources allocated by the base station to the terminal equipment, or when all the available modems are being used by the subscribers when providing the aggregation cost in the collective terminal equipment, i.e. when there is no idle modem. When a hook off is detected, first, a busy tone is transmitted to users, and priority is established in order of call attempts, and when an available channel is generated, according to the priority, a ring / tone generator (Ring / Tone) Genertor is controlled to generate a reorder tone so that the subscriber can try again. In the case of an incoming signal, a busy signal is transmitted through a signal channel.

The call processing procedure receives a dial tone signal from the network to provide a call service to the subscriber when the call channel allocation procedure in the group device and the radio resource allocation procedure with the base station are completed. Generates an Alton, and the subscriber transmits the DTMF signal using the established call channel. After transmitting DTMF signal, dial tone is turned off, and when receiving ring-back-tone signal from receiving station, subscriber line interface part receives ring-back-tone signal from subscriber line interface part. The ring / tone generator generates a ring-back-tone by driving a ring / tone generator. When the other party picks up the receiver, the ring-back signal is turned off and the call starts.

In the case of a hand signal, the ring / tone generator of the subscriber line interface board generates a 20 Hz ring signal through the subscriber line interface circuit using the received subscriber information. When the subscriber hooks off the receiver, the ring signal is turned off and the pass is possible. When the subscriber terminates the call, the call termination procedure is performed, and the collective terminal device releases the call path set to the subscriber, and performs the radio resource release procedure.

The present invention relates to a method for configuring a B-WLL matching device for accessing a broadband bidirectional wireless communication network in a group terminal device. The present invention provides voices of the same quality as existing wired lines to subscribers living in group houses such as apartment complexes and large buildings. Service and voice band data service can be provided, and general subscriber terminal devices such as telephone, FAX, modem, cordless phone, PC, etc. can be used in the same way as existing methods without using additional devices in each home. I can receive it.

In the broadband two-way wireless subscriber network, the position of the antenna of the base station and the terminal equipment is a very important factor in the communication quality. In the case of a single terminal device, the antenna is installed indoors or low outdoors, so that the radio wave environment is inferior due to surrounding buildings, which may cause a problem of guaranteeing the quality of the communication service. Management also becomes difficult. However, in the case of a group terminal device, a better quality service can be provided by installing an antenna on the roof of an apartment or on the roof of a large building. Since the B-WLL matching device uses a single antenna and an RF unit by using an IF coupler, the cost of the equipment can be lowered. The modem unit of the B-WLL matching device can be appropriately expanded to accommodate the capacity of the group terminal device according to the subscriber's demand. The configuration is possible to increase.

In addition, in terms of network configuration and management, network configuration costs can be reduced and centralized management can be expected to reduce maintenance costs.

Claims (5)

In a collective terminal device of a broadband bidirectional wireless communication network for voice band service, an RF unit for processing a B-WLL RF signal for connection with a broadband bidirectional wireless subscriber network and an IF signal output from the RF unit are separated into IF units. IF combiner transmits to IF unit or combines IF band signals output from IF unit and transmits them to RF unit, and converts IF band signal output from IF combiner to B-WLL modem input signal or B from subscriber side. An IF unit for up-converting the WLL signal to an IF band signal, and down-converting the input signal from the IF unit to the baseband, or up-converting and A / D converting or D / A-converting the baseband signal and performing channel encoding or Modem unit for decoding and demodulating and processing digital signals, and switch for interfacing with the modem unit and external time switch unit The voice board in the collective terminal device comprising a chipboard interface unit, and a processor unit for managing and controlling the device and communicating with the outside by allocating channel resources for the modem, controlling release and call processing for an incoming signal. B-WLL matching device for accessing broadband wireless network for band service. 2. The B-WLL matching device of claim 1, wherein the modem unit can increase one or more according to the number of subscribers. 2. The B-WLL matching device of claim 1, wherein each modem of the modem unit is equipped with one modem on one board. 2. The B-WLL matching device of claim 1, wherein the modem unit includes a plurality of modems on one board. The mobile station according to claim 1, wherein the processor unit attempts to communicate with the subscriber again when it becomes possible to allocate resources for communication by storing the subscriber's c when the subscriber has a large amount of communication and cannot allocate resources for communication. And a B-WLL matching device for accessing a broadband wireless network for voice band service in a collective terminal device.