KR100259545B1 - Data/voice service of w-wll - Google Patents

Abstract

PURPOSE: A method for providing data/sound mixed service in a W-WLL(Wideband-Wireless Local Loop) system is provided to offer data/sound mixed service by modifying a bandwidth allocated for data service and allocating it for sound service. CONSTITUTION: If an RIU(Radio Interface Unit) transmits a time slot modification request to an RP(Radio Port), the RP transmits the time slot modification request to an RPC(Radio Port Controller). The RPC transmits a channel modification complete message to the RP. Receiving the channel modification complete message, the RP prepares for data/sound mixed service and transfers a time slot modification confirmation message to the RIU. After receiving the time slot modification confirmation message, the RIU transmits time-divided data/sound information to the RP. The RP detects and separates data and sound from time-divided data/sound information and transmits them to the RPC.

Description

Mixed Data / Voice Service Method for Broadband Wireless Subscriber Line System

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadband wireless subscriber line system, and in particular, when a voice service is requested in a state where a user is provided with a predetermined bandwidth on one broadband code division multiple access channel, the service is already allocated for the data service. The present invention relates to a data / voice mixed service method of a broadband wireless subscriber line system that changes a predetermined bandwidth to allocate a voice service.

In general, a wideband-wireless local loop (hereinafter, abbreviated as " W-WLL ") system is a wireless communication between a base station and a terminal station, and the terminal station is fixed and according to the movement of the terminal station. It is the same as the operation principle of the mobile communication system except that there is no hand off function generated. In addition, various services can be provided to a terminal station by connecting a terminal for voice service, a terminal for fax service, and a terminal for data dedicated service.

1 is a block diagram of such a general W-WLL system.

As shown therein, a voice service terminal 10 for a voice service, a modem 11, a fax terminal 12 for a fax service, and a data terminal 13 for a data-only service are connected by wire. And a terminal station 20 which connects the terminal having the W-WLL service request to the base station 30 by wireless communication, and receives the airwaves propagated from the base station 30 and transmits the airwaves to the corresponding subscribers. Receives voice, data, control signals, etc., transmitted from the terminal station 20 through wireless communication, and transmits the voice, data, control signal, etc., transmitted from the base station controller 40 by wire to the base station controller 40. A base station 30 for receiving a control signal and transmitting the same to the terminal station 20 through wireless communication; A base station controller (40) located between the base station (30) and the switching center (50) to control a wired or wireless link during incoming / outgoing call processing and to manage the base station (30); It consists of an exchange station (50) which controls the overall operation so that the W-WLL service can be performed and matches with the public switched telephone network (60).

As shown in FIG. 2, the terminal station 20 includes a wired telephone interface unit 21, which provides an interface for connecting the voice service terminal 10 and the modem 11, and an integrated service digital network. The ISDN interface unit 22 provides an interface for accessing the ISDN service terminal 12 so that the service can be provided, and an interface for accessing the data-only service terminal 13. The signals received from the serial input / output unit 23, the wired telephone interface unit 21, the ISDN interface unit 22, and the serial input / output unit 23, respectively, and received from the base station 30. Is modulated to transmit the signal received from the time switch unit 24 to the base station 30, and the signal received from the base station 30 is demultiplexed to the subscriber. And a W-CDMA modem unit 25 which demodulates and transmits the call to the time switch unit 24.

The wired telephone interface unit 21 detects a hook off of the line interface unit 21a for transmitting and receiving an analog signal to and from the voice service terminal 10 and 11 and the voice service terminal 10. The power supply unit 21b for providing a DC loop current to the line interface unit 21a and an analog signal received from the line interface unit 21a by adaptively predicting and encoding the time switch. An adaptive prediction encoding codec 21c which transmits to the unit 24, converts the adaptive predictive encoded signal received from the time switch unit 24 into an analog signal, and transmits it to the line interface unit 21a, and the voice. When the call of the service terminal 10 is detected, the ring / tone generator 21d generates and transmits a ring tone.

The ISDN interface unit 22 generates a signal transmitted from the line interface unit 22a for transmitting and receiving signals to and from the terminal for ISDN service, and the line interface unit 22a as a frame to the time switch unit 24. And a frame processor 22b for converting the frame received from the time switch unit 24 into a signal that can be recognized by the ISDN service terminal and transmitting the signal to the line interface unit 22a.

Referring to the service method of the general broadband wireless subscriber line (W-WLL) system as described above are as follows.

First, the general W-WLL terminal station 20 supports general wireline telephone service, ISDN service, and data-only service, but at the same time does not support all three services, and at the same time through service negotiation when establishing a service connection 1 Only services of branches are supported.

Accordingly, if there is a service request from the data-only service terminal 13, the W-WLL system establishes a connection to perform the requested service. As a result, the data dedicated service terminal 13 is allocated a transmission bandwidth through service negotiation when establishing a connection.

As shown in Fig. 3A, one time slot of the time switch section 24 is composed of 8 bits, which is transmitted 8000 times per second. Thus, one time slot has a transmission speed of 64 kbps. Accordingly, when 128kbps is allocated during service negotiation for data-only service, two time slots are allocated. As a result, the time switch unit 24 allocates the data received from the serial input / output unit 23 to the two time slots TS0 and TS1 and transmits the data to the W-CDMA modem unit 25.

In the state where the data-only service is made at 128 kbps, if there is a service request from the voice terminal 10, the maximum allocable bandwidth is 144 kbps, and 64 kbps of bandwidth must be allocated for the voice service. Voice service does not work over the bandwidth.

Therefore, it becomes impossible to allow a newly requested voice service or perform a voice service after terminating a data-only service in which a service is already provided.

As a result, the service method of the conventional W-WLL system, when a voice service request is generated in the situation that the data transmission service is already available and the available transmission bandwidth is limited, the available bandwidth is limited and the bandwidth is allocated to the new service request. Because it can not do this, the two services cannot be supported at the same time and only one service has a disadvantage.

In addition, a modem supporting a single W-CDMA channel cannot provide multiple services.

Accordingly, the present invention has been proposed to solve the above-mentioned general problems, and an object of the present invention is to provide a voice service in which a user is provided with a data service with a predetermined bandwidth on one broadband code division multiple access channel. To provide a data / voice mixed service method of a broadband wireless subscriber line system that can provide a data and voice mixed service by changing a predetermined bandwidth allocated for a data service when requested. have.

In order to achieve the above object, a data / voice mixed service method of a broadband wireless subscriber line system according to the present invention,

A channel change request step of, upon receiving a time slot change request from a terminal station, sending a channel change request to a base station controller so that the base station changes a channel already allocated for data service for multiple service provision; When the base station controller receiving the channel change request negotiates a channel and transmits a channel change completion message to the base station, a time slot change confirmation step of preparing a data / voice mixed service and transmitting a time slot change confirmation message from the base station to the terminal station; ; When voice and data are time-divided and transmitted from the terminal station receiving the time slot change confirmation message, the method includes a service separation step of detecting and separating the voice and data and transmitting the same to the base station controller.

The channel change request step may include detecting whether a hook off for a voice service request has occurred in a terminal station while a data service is being provided, and if the hook off is detected, a data transmission channel currently in service. Requesting a time slot change to a base station through a signal subchannel of the step; and transmitting a channel change request to a base station controller to support a voice service and a data service at a base station receiving the time slot change request. It is characterized by.

1 is a block diagram of a typical broadband wireless subscriber line system,

2 is a block diagram of a general terminal station;

3A is an operation diagram of a time switch unit of a general terminal station;

3B is an operation diagram of a time switch unit of a terminal station according to the present invention;

4 is a flowchart illustrating a data / voice mixed service method of a broadband wireless subscriber line system according to the present invention.

<Explanation of symbols for main parts of drawing>

10: voice terminal 11: modem

12: terminal for fax 13: terminal for data

20: Terminal station 30: Base station

40: base station controller 50: switching center

60: PSTN network

Hereinafter, a data / voice mixed service method of the present invention of a broadband wireless subscriber line (W-WLL) system will be described in detail with reference to the accompanying drawings.

4 is a flowchart illustrating a data / voice mixed service method of a broadband wireless subscriber line system according to the present invention.

As shown therein, a channel change request step of transmitting a channel change request from a base station to a base station controller when receiving a time slot change request from a terminal station; A time slot change checking step of preparing for a data / voice mixed service and transmitting a time slot change confirm message to a terminal station when a channel change completion message is transmitted from the base station controller receiving the channel change request; When voice and data are time-divided and transmitted from the terminal station receiving the time slot change confirmation message, the service separation step includes detecting and separating voice and data and transmitting the same to the base station controller.

The channel change request step may include detecting whether a hook off for a voice service request has occurred in a terminal station while a data service is being provided, and if the hook off is detected, a data transmission channel currently in service. Requesting a time slot change to a base station through a signal subchannel of S2 and transmitting a channel change request to a base station controller to support a voice service and a data service at a base station receiving the time slot change request. do.

The time slot change checking step may include: negotiating and setting a new channel in order to support a voice service and a data service in a base station controller receiving the channel change request; Transmitting a change complete message; when receiving the channel change complete message, preparing a data / voice mixed service at a base station; and changing a time slot from a base station to a terminal station when preparation for a data / voice mixed service is completed. Sending a confirmation message.

In the service separation step, the terminal station receiving the time slot change confirmation message time-divides a data slot that is already in service, allocates data and voice to the base station, and transmits the data and voice to the base station. Detecting a time slot and separating data and voice and transmitting the data slot to a base station controller.

Referring to the accompanying drawings, a data / voice mixed service method of a broadband wireless subscriber line (W-WLL) system according to the present invention configured as described above is as follows.

First, when a data-only service request is generated from the data terminal 13, a service connection is established and a data-only service is provided. When the voice terminal 10 is hooked off for a voice service request, the terminal station 20 detects the hook off and provides a data-only service. Even in the losing state, a time slot change is requested to the base station 30 to perform this voice service multiplely.

That is, as shown in FIG. 3B, when two time slots (128 kbps) (TS0) (TS1) are allocated as one channel for the data-only service, this channel is divided into 128 kbps and the data-only service. In order to simultaneously provide a voice service, a time slot change request is transmitted from the terminal station 20 to the base station 30 through a signal subchannel of a data transmission channel currently in service.

At this time, the base station 30 manages a list of terminal stations supporting multiple services through one channel, and analyzes messages transmitted from the terminal stations, respectively. Accordingly, upon receiving the time slot change request, the base station 30 reduces the bandwidth of 128 kbps already allocated for the data-only service to 64 kbps and allocates it to the data-only service, and allocates the remaining 64 kbps for the newly requested voice service. Sends a channel change request to the base station controller 40.

Upon receiving the channel change request, the base station controller 40 negotiates to allocate a new channel while maintaining the channel currently being serviced. That is, two 32kbps Adaptive Differential Pulse Code Modulation (hereinafter, abbreviated as "ADPCM") voice channels and a channel for data service of 64kbps are set.

When the channel change is performed in this way, the base station controller 40 transmits a channel change completion message to the base station 30, and the base station 30 receiving the message demultiplexes information to be transmitted after being time-divided from the terminal station 20. After preparing to transmit through the E1 carrier (carrier) to transmit a time slot change confirmation message to the terminal station (20).

Upon receiving the time slot change acknowledgment message, the terminal station 20 instructs the time switch control program to time division and transmit the voice and data.

Then, the time switch control program in the terminal station 20 controls the time switch unit 24, as shown in Fig. 3B, to store two time slots TS0 (TS1) of 128 kbps already allocated for data service. By dividing, one time slot TS0 is allocated for data transmission while in service, and the other one time slot TS1 is allocated for the requested voice service. Accordingly, one W-CDMA channel, which was a data transmission channel, is divided into a data transmission channel and a voice transmission channel to support data and voice services on one W-CDMA channel.

When voice and data are time-divided and transmitted from the terminal station 20, the base station 30 detects this timeslot and demultiplexes the voice and data. Thereafter, voice and data are transmitted through two 32kbps ADPCM channels and 64kbps data channels newly negotiated with the base station controller 40. This operation allows multiple data services and voice services to be provided on one W-CDMA channel.

According to the present invention, when a service request is generated when all radio resources for a broadband wireless subscriber line (W-WLL) service are in use, a service that is being performed by dividing a bandwidth that is already in use to provide a newly requested service and a requested service are provided. To provide all of them.

As described above, in the data / voice mixed service method of the W-WLL system according to the present invention, one user provides a data service with a predetermined bandwidth on one broadband code division multiple access channel. When the voice service is requested while receiving, the predetermined bandwidth allocated for the data service is changed to allocate the voice service so that data and voice can be mixed on one W-CDMA channel. do.

In addition, low-cost modems that support a single W-CDMA channel can provide multiple voice and data services for efficient operation.

Claims (3)

In the service method of a broadband wireless subscriber line (W-WLL) system, A channel change request step of, upon receiving a time slot change request from a terminal station, sending a channel change request to a base station controller so that the base station changes a channel already allocated for data service for multiple service provision; When the base station controller receiving the channel change request negotiates a channel and transmits a channel change completion message to the base station, a time slot change confirmation step of preparing a data / voice mixed service and transmitting a time slot change confirmation message from the base station to the terminal station; ; When the voice and data are time-divided and transmitted from the terminal station receiving the time slot change confirmation message, the broadband wireless subscriber line is configured to detect and separate the voice and data and transmit them to the base station controller. W-WLL) data / voice mixed service method. The method of claim 1, wherein the channel change request step comprises: Detecting whether a hook off is generated for a voice service request in a terminal station while a data service is being provided; and if the hook off is detected, the base station through a signal subchannel of a currently transmitted data transmission channel. Requesting a time slot change, and transmitting a channel change request to a base station controller in order to support a voice service and a data service at a base station receiving the time slot change request. A data / voice mixed service method for charity (W-WLL) systems. The method of claim 1, wherein the voice and data time division transmission method of the terminal station in the service separation step, When the time slot change confirmation message is received from the base station, the time slots already allocated for data transmission are time-divided for multiple services, and each time-divided time slot is allocated for data transmission and voice transmission, thereby providing data and voice. A data / voice mixed service method of a broadband wireless subscriber line system, characterized in that the transmission to the base station in multiple.