KR20000007840A - Detecting and routing method of modem data call in wll system - Google Patents

Abstract

PURPOSE: A method is provided to change a wireless resource by transmitting a control message of a speed change through a wireless section, and to be able to transmit a data through a high speed modem by changing a routing to use a PCM encoding. CONSTITUTION: The method comprises: communicating by a RIU(radio interface unit) after passing a modem(2) from a PC(1), an interface terminal; transmitting the data transmitted through a RJ-11 Port from the RIU(3) to a WLL radio section in a W-CDMA method; routing the transmitted data to a switch(6) by passing a base station(4) and by transmitting a base station controller(5); be able to do a PC communication and a fax communication by changing a resource by detecting at a call establishment without regard to a band width to each subscriber in every mobile communication network; to be able to accept various services.

Description

Detection and Routing Method of Modem Data Call in WPU System

The present invention relates to a processing procedure and a method for enabling FAX and PC communication services in a wireless subscriber network (WLL) having a service quality and service form equivalent to that of a conventional landline telephone service. In order to use the port as it is for FAX and PC communication, it detects FAX signal and modem tone rather than voice signal and changes it according to the procedure of changing the wireless channel transmission rate.The low speed voice encoder is used as a 64Kbps PCM voice encoder. The present invention relates to a processing method and an implementation for converting (an encoder of a terminal access device and a base station controller) to enable a voice band data service used in an existing wired network.

In the case of the data service using the existing mobile communication, it was difficult to process the data service without using the modem.In the case of the modem data transmission, the call used in the PC communication and the fax service uses the general telephone port as the voice band data. There is no distinction between PSTN calls and voiceband data calls. In addition, the transmission speed was also very low (8 Kbps / 13 Kbps), so 33.6 Kbps or 56 Kbps, which is used mainly by PC users, could not be supported.

Accordingly, an object of the present invention is that the present invention allows a subscriber to detect a tone signal when using a modem or a fax, change a radio resource by transmitting a control message for a speed change over a radio section, and change the radio resource. The routing is changed to use PCM encoding instead of encoder to enable data transmission through high speed modem.

1 is a schematic diagram of a WLL system in which a method for detecting and routing modem data calls in accordance with the present invention is implemented;

FIG. 2 is a detailed block diagram of the base station controller of FIG. 1; FIG.

The configuration of the present invention consists of two functional blocks that are processed by the H / W part and the protocol.

Tone Detection

In PC communication in a WLL system, a carrier signal of a modem is transmitted after call setup and before subscriber data is transmitted. At this time, the modem tone is detected from a tone detector manufactured by H / W from the call set in the base station controller. It may be a general method of detecting as H / W for detecting a frequency by a tone detection method. The CNG tone is a calling tone and has an intermittent ratio of 1100 ± 38 Hz 0.5 sec / 3.0 sec. This signal indicates that it is a modem terminal signal, which is a necessary frequency in a fax and modem relay structure. CED tone is 2100 ± 15Hz, duration is 2.6 ~ 4.0 seconds and it is CNG tone. When CRS tone informs that calling party is modem, it indicates that it is modem if corresponding party is modem tone. When the CED tone is received, modem communication is performed. Therefore, the actual CED tone is detected. When the CED tone is detected, the call detected by the change of the register value by the interrupt call is recognized as the modem call, and immediately proceeds to the channel conversion process.

◆ Protocol processing

When the tone signal is detected, the WLL system application unit is informed and a control command (Primitive) is issued to the WLL radio resource management (RM) layer. The RM function block receiving the command requests a bearer channel rate change request using a wideband code division multiple access (W-CDMA) method (Modify Request). After receiving the rate change message, the terminal side transmits a message (Modify Complete) to the base station, and then changes to 64 Kbps PCM encoder instead of the low speed encoder of the terminal.

It also controls the activation of the physical layer to change the traffic channel, which is the radio resource being used, to the same 64Kbps transmission rate.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a system configuration to which the present invention is applied, and communicates from a subscriber station PC (1) via a modem (2) to a radio interface unit (RIU), and RJ in the RIU (3). Data transmitted through the -11 port is transmitted to the WLL radio section in the W-CDMA manner, and the transmitted data is transmitted to the base station controller 5 through the base station 4 and routed to the switch 6.

The modem is a device for data transmission using a telephone line and is provided in an existing PC or internally. For the specification of signaling for voice band modem, etc., refer to the contents of V series of ITU-T, and the other modem is a subscriber in the modem pool in the device 7 for the packet data connection from the base station controller. It is tailored to the modem and directly connected to the host for a packet data connection. In the process of data transmission and reception using the switched line modem, the modem is connected to the asynchronous terminal (DTE), so the built-in modem performs error correction and asynchronous / synchronous conversion.

FIG. 2 is a detailed block diagram of the base station controller of FIG. 1, which includes a main processor and a call processing unit 18, a TRANSCODER unit 19, a switching unit 21, a MUX / DEMUX unit 20, a MODEM DETECTOR 25, and a relay. And LINE INTERFACE units 22, 24, and 26, which are matching devices.

First, the main processor and the call control unit 18 is composed of a processor and a memory, for the purpose of overall control and call processing of the system. The processor is a base station operating device in addition to resource management and state management functions such as S / W processing and download, various system faults and internal data transmission, transcoder status in the base station controller, trunk status interfaced with the WLL switch, and call status. It handles the message processing function and subscriber and service related information necessary for call processing such as matching, delivery of related message upon call setup / disassociation of incoming / outgoing call from terminal and exchange. It also controls the ability to report this to the operating system and the translation process to translate the WLL's call-related messages into the exchange access protocol.

The transcoder unit 19 performs a function of converting / inverting a voice coded signal into a 64 Kbps PCM voice signal for communication between the base station and the WLL exchange period, and increases the capacity of the WLL system, which is a W-CDMA system. And power control to use minimum power while satisfying the quality of service required for the reverse channel. There is a module 20 for multiplexing / demultiplexing the transcoder and muxing / demuxing the transcoder of different baud rate and transmitting it to the line I / F so that the E1 time slot is constant. To be sent to.

The time switching unit 21 performs a matching function of exchanging traffic information and control information with a base station, and performs a function of routing information and control information for a data service. The base station matching unit 22, which is an external interface, performs a matching function of the base station controller and the base station and a digital relay line matching function for communication with the base station. IWF matching module 23 for data communication is a module that provides a routing path for asynchronous data transmission. W-CDMA wireless transmission method in wireless subscriber station device through RS232C serial data transmission of up to 144Kbps from subscriber data port. It is transmitted to the base station, and it is separated from the general call by the base station controller and delivered to the IWF to enable the Internet or other data services.

That is, when a subscriber with an asynchronous terminal (for example, a personal computer) connects to an internet network or a packet network by using a serial transmission line of RS232C without an additional device such as a modem, the IWF is directly connected to the base station controller without going through an exchange. It can be accessed through the data service.

Modem detector module 25 for voice band data communication is a module that provides a routing path for voice band data transmission. The modem tone signal is transmitted from the PC subscriber to the general telephone port. Transmitting 64Kbps PCM coded data from base station controller in wireless channel changing procedure and wireless subscriber station device of setting path by separating it from general call in modem detector module of base station controller Voiceband data service is possible by passing through the process to the exchange.

The data service process through the voice band communicates with a radio interface unit (RIU) via a modem from a personal computer (PC), which is a subscriber terminal. It is transmitted by CDMA method and the transmitted data is transmitted to base station controller through base station.

In the data service process through voice band, the FAX service, which is not PC communication, becomes FAX instead of the above PC, which is likewise transmitted to the base station controller from the equipment station through the radio section and directly to the other party through the switching network.

In the base station controller, a modem detector exists to detect a modem signal and change the 32 Kbps encoder to a 64 Kbps PCM signal to match the modem speed. This means that the modem connected to RJ-11 for voice band data transmission (PC communication) can receive 28.8 Kbps or 33.6 Kbps or other transmission speeds. It is to change the transmission speed to support the maximum speed.

Therefore, in the case of voice band data communication, the call path is opened in the call setup step and a modem tone signal is generated and transmitted at a constant frequency to the call path. At this time, the MODEM tone signal transmitted to the base station controller through the base station immediately transmits the signal to the subscriber station through the wireless section when detected by the tone signal detector, thereby increasing the encoder speed of the voice encoder of the subscriber station to 64 Kbps PCM. In order to make the change and to process the encoder / decoder of the base station controller itself to 64 Kbps, it is to bypass the path connected to the existing low speed encoder. (Therefore, this WLL system can fully use various low speed voice encoders and converts to 64 Kbps immediately during voice band data communication regardless of the type.) Resource change message goes through the W-CDMA channel through the radio section to the terminal side. . Upon receiving this, the wireless subscriber station device converts from the low speed encoder to the 64 KbpsPCM encoder and changes the attributes of the wireless channel. The base station controller also changes the transmission rate of the channel attribute of the radio resource to 64 Kbps. The process is illustrated below.

After this process, the user data transmitted through the modem passes through the voice encoder of the base station controller, which is 64 Kbps PCM signal, and is transmitted to the exchange as it is. In this way, FAX data can also be transmitted and received.

According to the system configuration method of the present invention, the existing general telephone service is wirelessly available by using the W-CDMA method, which is a wideband code division access method in the wireless section, and various low speed voice encoders are introduced by using a modem detector module. In addition, the data service can provide economical traffic processing and various services to users at low cost by directly accessing and routing the data network separately from the switching network. As described above, the present invention detects calls at all mobile communication networks considering wireless channel efficiency as well as WLL, and detects them when setting up a call and changes resources to enable PC communication and fax communication. In addition, there is an effect that can accommodate a variety of services.

Claims (1)

In a wireless network system including a wireless base station and a base station control device capable of wirelessly connecting radio waves of several GHz to tens of GHz bands with a wireless terminal device and a code division multiplex (CDMA) method, currently used by a PC communication subscriber in a target system. In order to support all modem speeds, the base station control device or the wireless terminal device detects a modem signal directly using a modem detector and changes the transmission rate of the voice encoder of the terminal device through a wireless section and transmits a wireless channel. Modem data call detection and routing method in a WLL system that controls the rate change so that a low-speed voice encoder can be used for voice services simultaneously with data transmission.