KR100236231B1 - Base station controller of wll - Google Patents

Abstract

The present invention relates to a base station controller (RPC) in a wireless subscriber network (WLL) system for providing voice and data services by wirelessly replacing a POTS between a switch and a subscriber, and voice information and data from a WLL exchange or an IWF to a base station. In case of transmitting information, data information received from IWF is directly switched in TSU and transmitted to LMS through LIM. 64Kbps voice information received from WLL exchange is compressed and converted to 16Kbps or 32Kbps through TCAU to convert TSU and LIM. The data information of 64Kbps received from the WLL exchange is transferred to the base station by switching directly from the TSU to the base station.In case of transmitting voice information and data information from the base station to the WLL exchange or IWF, among the data received from the base station Data information to be sent to the IWF is switched directly from the TSU to the IWF. In other words, the 16Kbps or 32Kbps voice information to be transmitted to the WLL exchange is recovered from TCAU to 64Kbps voice information and transmitted to the WLL exchange through the TSU and LIM.The 64Kbps data information to be transmitted to the WLL gateway exchange is directly transmitted from the TSU. Switch to transmit to the WLL exchange.

Description

Base station controller in wireless subscriber network (WLL) system

The present invention relates to a base station controller (Radio) of a wireless local loop (WLL) system for providing voice and data services by wirelessly replacing a plain old telephone service (POTS) of an exchange. Port Controller (hereinafter referred to as 'RPC').

Recently, the WLL system, which is a communication network providing 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 a telephone service by wire, It is emerging.

Unlike a mobile phone or a personal communication system (PCS), such a WLL system uses a fixed subscriber access device and thus does not have a handoff function between cells.

That is, although a conventional cellular system has a cell-to-cell call transfer function, the WLL system does not need a call transfer function and a synchronization function between base stations, so that a Global CDMA Interconnection Network (GCIN) system and a BSC-GPS ( Does not require a Base Station Controller-Global Position System system.

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

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide an RPC of a WLL system capable of providing voice and data services by wirelessly replacing a POTS between an exchange and a subscriber.

RPC of the WLL system of the present invention to achieve this object, when transmitting the voice information and data information from the WLL exchange or IWF to the base station, the data information received from the IWF is switched directly in the TSU base station through the RPIM of the LIM 64Kbps voice information received from the WLL exchange is compressed and converted into 16Kbps or 32Kbps through the LEIM, TSU, and TCAU of the LIM, and transmitted to the base station via the RPIM of the TSU and the LIM, and from the LEIM of the LIM from the WLL exchange. Received 64Kbps data information is switched directly from the TSU to be transmitted to the base station through the RPIM of the LIM, and when the base station transmits voice information and data information to the WLL exchange or IWF, the data received from the base station must be transmitted to the IWF. The data information to be received is received through the LIM's RPIM, switched directly from the TSU to the IWF, and forwarded to the WLL exchange. The 16Kbps or 32Kbps voice information to be transmitted is sent to the TCAU via the LIM's RPIM and TSU, and TCAU restores and converts the 64Kbps voice information to the WLL exchange via the TSU and the LIM to the WLL exchange. The data information of is received through the RPIM of the LIM, it is characterized in that it is switched directly in the TSU and transmitted to the WLL exchange.

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

* Explanation of symbols for main parts of the drawings

10: RCCP 20: RACP

30: CKD 40: LIM

41: RPIM 42: LEIM

50: TSU 60: TCAU

61: VMDA 62: VSPA

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

1 is a block diagram of an RPC of a WLL system according to the present invention, which exchanges RPM and operation information for integrating and managing various operation information of an RPC, and exchanges call control related information with a WLL exchanger (not shown) and a base station. A Radio Call Control Processor (RCCP) 10, a Radio Alarm Control Processor (RACP) 20 which collects and reports various alarms generated in each component block in the RPC to an RPOM (not shown), and each of the RPCs. A CKD (Clock Distributor) 30 that provides a reference frequency and timing in a configuration block, a LIM 40 that matches a base station and a WLL exchange, a traffic path and a control information path between the LIM 40 and a TCAU to be described later; Low Delay-Code Excited Linear Predictor (LD-CELP) and voice information of a WLL exchanger input through the TSU 50 and a Time Switching Unit (TSU) 50 to provide an interworking function with IWF. Adaptive Differential Pulse Code Modulation (ADPCM) algorithm And a transcoder assembly unit (TCAU) 60 which compresses and converts the voice information of the base station input through the TSU 50 in accordance with the LD-CELP and ADPCM algorithms.

In more detail, the function of each configuration block, the RCCP (10) is a call processing control, call setup and release, paging support, overload control, resource management and subsystem state management in the RPC, and WLL exchange It performs the function of integrating and reporting the connection for the call control related information exchange and the various operation information of the RPC.

In addition, transmission of call control-related information to the WLL exchanger is performed using two-wire analog matching or V5.2 signaling, and is composed of redundancy for system stabilization.

The RACP 20 is a processor that collects various alarms generated from the RPC by hardware (H / W) or software (S / W), and then reports them to the RPOM for use in system operation. Common part (not shown) that collects the alarms generated by software or reports them to the RPOM, and alarm collection part (not shown) which collects hardware generated alarms from each component block in the RPC to the common part. It consists of.

The CKD 30 is for synchronizing between the WLL exchange or the base station and the RPC. The CKD 30 synchronizes the RPC through the master clock of the WLL exchange, and the synchronization between the RPC and the base station receives the clock received by the RPC from the WLL exchange. The generated clock is sent to the base station for synchronization.

The LIM 40 is modularized by combining the base station interface connecting the base station and the RPC and the exchanger interface connecting the exchange and the RPC into one, and comprises a base station matching module between the base station and the RPC and an exchange matching module between the exchange and the RPC. The base station matching module performs E1 / HDSL (high level Data Link Control procedures) relay line matching, and the exchange matching module performs E1 relay line matching.

The base station and the IWF perform link access procedures on the D-channel (LAPD) protocol matching, and the exchange performs V5.2 protocol matching.

The TSU 50 is designed to easily expand processing capacity when a system is expanded, and a modem detector module and a DTMF tone can be accommodated to accommodate a POTS terminal with a voice transmission function and a fax and modem with a data transmission function. It has a generator (Tone Generator).

The TACU 60 compresses voice information of a VDA (VoCoder Mux / Demuxe Assembly) 61 matching with the TSU 50 and a WLL exchanger input through the VMDA 61 according to an LD-CELP and ADPCM algorithm. Transforming and transmitting to the base station via the TSU (50), and restores and converts the voice information of the base station input through the VMDA (61) according to the LD-CELP and ADPCM algorithm to the WLL exchange via the TSU (50) Is composed of a VSPA (Vocoder Signal Processing Assembly) 62.

In addition, the TACU 60 is implemented to perform signal processing and connection of a low speed speech coder as well as an echo cancellation function, a data bypass function, and a power control function.

In the RPC of the present invention configured as described above, the function of the LCIN (Local CIN) in the base station controller of the conventional cellular system is replaced by the LIM 40 and the TSU 50 using the time slot method, and the function of the LCIN. One of the functions of signaling between RPC internal building blocks is replaced by Ethernet.

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

First, referring to the operation of the RPC performing the forward data transmission of the voice information and data information from the WLL exchange or the IWF to the base station, the LIM 40 in the RPC E1 link the voice information and data information transmitted from the WLL exchange Received through, and transmits it to the TSU (50).

Subsequently, the TSU 50 transmits the received voice information to the TCAU 60 by switching according to a time slot.

At this time, the data information received from the IWF from the WLL switch is directly switched in the TSU 50 and transmitted to the base station through the LIM 40.

Subsequently, the VSPA 62 of the TCAU 60 that receives the voice information received from the WLL switch converts 64 Kbps PCM voice information into 16 Kbps or 32 Kbps voice information according to the LD-CELP or ADPCM algorithm.

Then, the converted 16Kbps or 32Kbps voice information is transmitted to the TSU 50 through the VMDA 61, and then transmitted from the TSU 50 to the base station via the LIM 40.

Next, the operation of the RPC performing reverse data transmission in which the base station transmits voice information and data information from the base station to the WLL exchange or IWF, first, the LIM 40 in the RPC transmits the voice information and data information received from the base station to the TSU. Send to 50.

Then, in the TSU 50, the data information to be transmitted to the WLL exchange and the data information to be transmitted to the IWF of the received data are switched immediately and transmitted to the IWF through the LIM 40, and 32Kbps to be transmitted to the WLL exchange. Alternatively, 16 Kbps of voice information is transmitted to the TCAU (60).

Accordingly, the VSPA 62 of the TCAU 60 restores and converts the received 16 Kbps or 32 Kbps voice information into 64 Kbps PCM voice information according to the LD-CELP or ADPCM algorithm.

Then, the converted 64Kbps PCM voice information is transmitted to the TSU 50 through the VMDA 61, and then transmitted from the TSU 50 through the LIM 40 to the WLL exchange.

As described above, the present invention implements RPC for transmitting / receiving voice information and data information between a WLL exchanger or an IWF and a base station of a WLL system, as well as data services such as voice, information communication, facsimile, high speed data, There is an effect that can provide a video and multimedia information service.

Claims (2)

RCCP (10) which integrates and manages various RPC operation information, exchanges WLL gateway exchange and call control related information, and RACP (20) which collects and reports to RPOM various alarms generated in each component block in RPC. A traffic path and control between the CKD 30 providing a reference frequency and timing to each component block in the RPC, the LIM 40 matching the base station and the WLL gateway exchange and the IWF, and the TCAU to be described later of the LIM 40. The TSU 50 provides an information path, and the voice information of the WLL gateway exchange input through the TSU 50 is compressed and converted according to the LD-CELP and ADPCM algorithms and transmitted to the base station, and input through the TSU 50. A base station controller of a wireless subscriber network (WLL) system, characterized in that the TCAU (60) configured to restore and convert the voice information of the base station according to the LD-CELP and ADPCM algorithm to transmit to the WLL exchange. 2. The apparatus of claim 1, wherein the TCAU 60 compresses and converts the voice information of the VMDA 61 matching the TSU 50 and the WLL switch input through the VMDA 61 according to the LD-CELP and ADPCM algorithms. Transmits to the base station via the TSU 50, and restores and converts voice information of the base station input through the VMDA 61 according to the LD-CELP and ADPCM algorithms and transmits the converted voice information to the WLL exchanger through the TSU 50. A base station controller of a wireless subscriber network (WLL) system, characterized by comprising a VSPA (62).

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