KR19990016166A - Base station apparatus of wireless subscriber network system - Google Patents

Abstract

The present invention relates to a base station apparatus (RP) of a WLL system for wirelessly replacing a POTS between an exchange and a subscriber, and to provide voice and data services. RCPU 10 for providing the CKD, CKD 20 for providing the reference frequency and timing to each component block in the RP, LIM 30 matching with the base station controller, and the voice signal transmitted through the LIM 30 And a DU 40 that converts the data signal into an IF signal after baseband processing, converts an IF signal transmitted from the XCVU to be described later into a baseband signal, and then converts the data signal into a voice signal and a data signal, and the DU 40. The XCVU 50 converts the IF signal converted from the RF signal to the RF signal and conversely converts the RF signal into the IF signal and transmits the RF signal converted from the XCVU 50 to the DU 40. Send by RFU (60) for transmitting to the XCVU (50) after transmitting to the subscriber access device via the antenna (TX Ant), and receives the RF signal transmitted from the subscriber access device (RX Ant) to low noise amplification It is configured to, as well as data services such as voice, information communication, facsimile, there is an effect that can provide high-speed data, video and multimedia information services.

Description

Base station apparatus of wireless subscriber network (WLL) system

The present invention provides a base station apparatus (Radio) of a wireless local loop (WLL) system for providing voice and data services by wirelessly replacing a plain old telephone service (POTS) of a switch and a subscriber. Port; hereafter referred to as 'RP'.

Recently, the WLL system, which is a communication network that provides high-speed data, video, and multimedia information services as well as data services such as voice, information communication, and facsimile (FAX) by connecting wirelessly between a network and a terminal for providing telephone service, not wired, It is emerging.

Unlike a mobile phone or a personal communication system (PCS), the WLL system uses a fixed subscriber access device so that there is no handoff between cells.

That is, the conventional cellular system has an inter-cell call transfer function, but the WLL system does not need the GBTU block of the TFU block in the cellular system base station apparatus without the call transfer function and the base station synchronization function.

In addition, since the conventional cellular system uses in-band signaling, a packet method is used for signal and data transmission with a base station controller and a signal and data transmission between internal blocks of a base station. Since the system uses out-band signaling, it is difficult to use a packet method for data transmission with the base station controller.

The present invention has been made to solve the above problems, and an object thereof is to provide an RP of the WLL system to provide voice and data services by wirelessly replacing the POTS of the exchange and the subscriber.

The RP of the WLL system of the present invention for achieving this object, when transmitting the voice signal and data signal from the base station controller to the subscriber access device demultiplexed the voice signal and data signal in the demux of TDMA in the RP, In the CDCA CE, the demultiplexed signal is miraculized, the BICA converts the baseband processed signal to an IF signal, and then the IF signal is converted to a TF signal through an XCVU UPCA, followed by the HPAU of the RFU. In the case of transmitting a voice signal and a data signal from a subscriber access device to a base station controller through a transmitting antenna, and receiving the RF signal from the subscriber access device through a receiving antenna at the RXFU of the RFU Low noise amplification, convert the amplified RF signal into IF signal in DNCA of XCVU, and convert in the BICA of DU The IF signal is converted into a baseband signal, and then the converted baseband signal is converted into respective voice signals and data signals by CE of the CDCA, and then multiplexed through a mux of TDMA to LIM according to an E1 or T1 time slot. Characterized in that the transmission to the base station controller through.

1 is a block diagram of a base station apparatus of a wireless subscriber network (WLL) system according to the present invention;

* Explanation of symbols for the main parts of the drawings

10: RCPU, 20: CKD, 30: LIM, 40: DU, 41: TDMA, 42: CDCA, 43: BICA, 50: XCVU, 51: UPCA, 52: DNCA, 53: TCCA, 60: RFU, 61: HPAU, 62: HPCU, 63: TXFU, 64: RXFU

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the RP of the WLL system according to the present invention.

1 is a block diagram of an RP of a WLL system according to the present invention, which controls and manages a subsystem in an RP and provides an interface between a base station controller (not shown) and a subsystem (10). ), A CKD (ClocK Distributor) 20 that provides a reference frequency and timing to each component block in the RP, a Line Interface Module (LIM) 30 that matches a base station controller, and the LIM 30 and transmits the same. The DU 40 converts the voice signal and the data signal into baseband signals after the baseband processing, converts the IF signal transmitted from the XCVU to be described later into baseband signals, and then converts the voice signal and the data signal into the baseband signal. A high-power amplification of the RF signal converted in the XCVU (Transceiver Unit) 50, which up-converts the IF signal converted at 40 to an RF signal and conversely down-converts the RF signal to an IF signal, transmitting the DU 40 to the DU 40. Via transmit antenna (TX Ant) RFU (Radio Frequency Unit) which transmits to the subscriber access device (not shown), receives the RF signal transmitted from the subscriber access device through a receiving antenna (RX Ant), amplifies low noise, and then transmits to the XCVU 50. It consists of 60.

In more detail, the function of each of the configuration block, the RCPU 10 is a SACA (Site Alarm) to collect the alarm (Alarm) generated from the subsystem, each independently of the RP Control Processor Assembly (RCPA) (not shown) Control) (not shown) to perform functions such as call processing, shape information management, statistics and measurement, and fault / exception processing, which are inherent to RP.

In addition, the RCPU 10 is the uppermost main controller that operates and manages the RP as a whole, and performs call processing and maintenance functions of the entire RP and controls the lower processor.

The CKD 30 is for synchronizing between a WLL exchange (not shown) or a base station controller and an RP. The CKD 30 synchronizes a base station controller through a master clock of the WLL exchange and a synchronization between the RP and the base station controller. The base station controller synchronizes the clock generated with the clock received from the WLL exchanger to the RP.

The DU 40 demultiplexes a voice signal and a data signal received through the LIM 30 according to a time slot, and multiplexes a signal transmitted by a CDCA to be described later. Assembly (41) and CDCA (CDMA Digital Card Assembly) for baseband processing the demultiplexed signal in the TDMA 41, and converting the baseband signal transmitted from the BICA to be described later into respective voice signals and data signals. (42) and a baseband & IF conversion card assembly (BICA) for converting the baseband processed signal from the CDCA 42 into an IF signal and converting an IF signal transmitted from the XCVU 50 into a baseband signal ( 43).

The TDMA 41 is a DU controller (not shown) for controlling the DU 40 and a MUX / DEMUX (not shown) for multiplexing and demultiplexing signals transmitted and received. The CDCA 42 is configured to perform signal buffering, a TDMA 41 interface, an RS-232 interface, a digital combination, a digital to analog conversion (DAC), and an analog drive function. Channel element (hereinafter referred to as "CE") including a CCC (not shown) and a demodulator, symbol combiner, symbol controller, deinterleaver, modulator, traffic interface, channel element controller, etc. (not shown) Not configured).

The XCVU 50 is an UPCA (UP Converter Assembly) 51 for up-converting an IF signal transmitted from the BICA 43 of the DU 40 to an RF signal, and an RF signal transmitted from the RFU 60. Is composed of a DownN Converter Assembly (DNCA) 52 for frequency downconverting the IF signal to an IF signal, and a TCCA 53 for controlling the operation of the UPCA 51 and the DNCA 52.

The RFU 60 powers a linear-power amplifier unit (HPAU) 61 for high power amplifying the RF signal converted by the UPCA 51 of the XCVU 50, and the RF signal amplified by the HPAU 61. And a band pass filter (HPCU) for power distribution of the RF signal input from the RXFU to be described later, and a band pass filter (BPF) to limit the RF signal coupled in the HPCU 62. Tx front end unit (TXFU) 63 radiating to the air through a transmit antenna (TX Ant), and RXFU (low noise amplification of the RF signal received through the receive antenna (RX Ant) to transmit to the HPCU 62 ( Rx Front End Unit).

The RXFU 64 includes a BPF (not shown) for band-limiting an RF signal received through a RX Ant and a low-noise amplifier (LNA) (not shown) for amplifying a fine RF signal. In this case, there are two paths for each of two receive antennas per sector, and each block is composed of independent blocks.

The BPF, which filters the RF signal and transmits it to the LNAU, uses a total of six BPFs per sector when the system supports one sector three sectors per antenna.

In the RP of the present invention configured as described above, the function of BIN (BTS Interconnection Network) in the base station of the conventional cellular system is replaced by mux / demux in the LIM 30 and the TDMA 41 applying the time slot method. One of the functions of BIN, the signaling function between RP internal building blocks is replaced by Ethernet.

Referring to the operation of the RP of the WLL system according to the present invention configured as described above are as follows.

First, referring to the operation of the RP performing the forward data transmission of the voice signal and the data signal from the WLL exchange and the base station controller to the subscriber access device, the DU 40 in the RP is E1 or T1 from the base station matching device of the base station controller. Voice and data signals received over the link are received via the LIM 30 in the RP and demultiplexed in the demux of the TDMA 41.

Then, in the CE in the CDCA 42 of the DU 40, each signal demultiplexed by the TDMA 41 is convolutional encoding, interleaving, and I / Q spreading. And performs the miracle band processing, and sends it to the BICA 43.

Then, the BICA 43 multiplies the baseband processed I / Q signal by a carrier wave and converts the IF signal into an IF signal, and then combines the sector by sector to transmit it to the XCVU 50.

Accordingly, the UPCA 51 of the XCVU 50 converts the IF signal into an RF signal, and then high power amplifies the RF signal to match the transmission output by the HPAU 61 of the RFU 60. It transmits to subscriber access device by radiating to the air through TX Ant).

Next, referring to the operation of the RP performing the reverse data transmission of the voice signal and data signal from the subscriber station to the base station controller and the WLL exchange, first, the RXFU 64 of the RFU 60 is a receiving antenna (RX Ant Receives the RF signal from the subscriber access device through the low noise amplification and transmits to the XCVU (50).

Subsequently, the DNCA 52 of the XCVU 50 converts the RF signal into an IF signal and transmits the converted RF signal to the BICA 43 of the DU 40.

Then, the BICA 43 removes the carrier from the transformed IF signal and converts it into a baseband signal, and then combines diversity by a Rake receiver at CE in the CDCA 42, and then combines this. The converted signals are converted into respective voice and data signals through I / Q despreading, deinterleaving, and convolutional decoding.

Accordingly, the TDMA 41 of the DU 40 multiplexes the converted voice signal and the data signal through the MUX, and then transmits them to the base station controller through the LIM 30 in accordance with an E1 or T1 time slot.

As described above, the present invention implements RP for transmitting / receiving a voice signal and a data signal between a base station controller and a subscriber access device of a WLL system, as well as high-speed data, as well as data services such as voice, information communication, and facsimile. There is an effect that can provide a video and multimedia information service.

Claims (4)

RCPU 10 for controlling and managing subsystems in the RP and providing an interface between the base station controller and the subsystems, a CKD 20 for providing reference frequencies and timings to each component block in the RP, and a LIM matching with the base station controllers And a baseband process of the voice signal and the data signal transmitted through the LIM 30, and then converting the IF signal into a baseband signal after converting the IF signal transmitted from the XCVU to be described later into a baseband signal. The DU 40 converts the data signal and the XCVU 50 up-converting the IF signal converted from the DU 40 to the RF signal and conversely converting the RF signal down to the IF signal and transmitting the downlink signal to the DU 40. ) And high power amplification of the RF signal converted by the XCVU 50 to a subscriber access device through a transmit antenna (TX Ant), and transmits an RF signal transmitted from the subscriber access device through a receive antenna (RX Ant). Low noise by receiving Ruffian after the base station apparatus of the Wireless Local Loop (WLL) system, characterized in that consisting of RFU (60) for transmitting to said XCVU (50). The TDU 41 of claim 1, wherein the DU 40 demultiplexes a voice signal and a data signal received through the LIM 30 according to time slots, and multiplexes a signal transmitted from a CDCA to be described later. A baseband processing of the demultiplexed signal by the TDMA 41, and a baseband signal transmitted by a BICA to be described later into respective voice signals and data signals, and a baseband by the CDCA 42. And a BICA (43) for converting a band-processed signal into an IF signal and converting an IF signal transmitted from the XCVU (50) into a baseband signal. According to claim 1, The XCVU (50) is UPCA (51) for frequency up-converting the IF signal transmitted from the BICA (43) of the DU (40) to the RF signal, RF RF transmitted from the sound RFU (60) A base station of a wireless subscriber network (WLL) system, comprising: a DNCA (52) for down-converting a signal into an IF signal; and a TCCA (53) for controlling the operation of the UPCA (51) and the DNCA (52). Device. According to claim 1, wherein the RFU (60) is a high power amplification of the RF signal amplified in the HPAU (61) and the HPAU (61) to the RF signal converted in the UPCA (51) of the XCVU (50) And, the HPCU 62 for power distribution of the RF signal input from the RXFU to be described later, and the BPF band-limited to the RF signal coupled in the HPCU 62 to radiate to the air through the transmission antenna (TX Ant) A base station of a wireless subscriber network (WLL) system, comprising a TXFU (63) and an RXFU (64) for low noise amplification of RF signals received through a receiving antenna (RX Ant) and transmitting them to the HPCU (62). Device.