KR20010087048A - method for data transmission of mobile communication telephone - Google Patents

Abstract

PURPOSE: A method for transmitting data between mobile communication terminals is provided to maintain an audio with high quality and transmit video data by transmitting audio and video data using an inter-different service option. CONSTITUTION: An audio data is assigned in a primary traffic channel through a switch and a base station controller using a vocoder algorithm, and the assigned audio data are transmitted and received. Video data are assigned in a secondary traffic channel through a network interlocking device connected with the switch, and the assigned video data are transmitted and received.

Description

Method for data transmission of mobile communication telephone}

The present invention relates to mobile communication, and more particularly, to a data transmission method between mobile communication terminals for transmitting and receiving voice data and video data between CDMA terminals.

When classifying communication network for information transmission into wired network and wireless network, wired network is real-time and high-speed transmission from voice service based on PSTN through narrow-band communication service such as low speed data and image that requires relatively low data rate. It is evolving into a broadband multimedia service that combines data, video, image and video.

On the other hand, the wireless network includes a cordless telephone that applies a wireless concept to an existing landline telephone, and a cellular telephone corresponding to a vehicle telephone and a mobile telephone.

As the demand for wireless communication increases, we seek to switch from analog system to digital system as a method for economically and efficiently allocating communication lines, miniaturization and lightening of terminals, security and high quality of data. It is evolving to enable the transmission of multimedia information such as video.

As the communication industry develops, mobile terminals are becoming a necessity of modern people, and mobile terminal manufacturers are developing mobile terminals having various functions to provide more various services to subscribers.

Accordingly, communication service companies are releasing mobile terminals capable of transmitting and receiving text and video data in addition to voice, and future communication services are wireless multimedia service types that allow users to easily access various services while enjoying freedom of movement. Will be.

In addition, by providing the current basic voice service and low-speed data service to provide high-speed data services, such as more advanced Internet service and video and video transmission, the market is expected to grow further by satisfying various service needs of mobile subscribers. .

In mobile communication such as a radiotelephone system, multiple access is provided so that a plurality of base stations are installed at predetermined intervals forming a service area, and each base station is connected to a plurality of mobile stations (terminals).

In this case, first, a predetermined transmission band is allocated to each base station, a plurality of transmission channels are set in the transmission band, and when there is a request for communication or the like from each terminal device, one of the transmission channels is allocated to the terminal device and thus the terminal. The device side initiates communication via the base station using the allocated transmission band.

For example, the communication system in which a transmission channel is established includes a frequency division multiple access (FDMA) method, a time division multiple access (TDMA) method, a code division multiple access (CDMA) method, and the like.

The communication method of the CDMA method is one of a method in which a specific code is assigned to each terminal device and carriers having the same frequency are spread-modulated by a code and transmitted to each base station.

The receiving side synchronizes each code to identify a signal from a desired terminal device.

In the radiotelephone system, although the CDMA method is used and the transmission channel is set accordingly, the transmission capacity of data that can be transmitted on one transmission channel is predetermined, and therefore the transmission capacity may vary depending on the type of transmission data. Can't.

Conventional voice data between CDMA terminals uses data using a vocoder algorithm such as Qualcomm Codebook Excited Linear Prediction (QCELP) and Enhanced Variable Rate Codec (EVRC) as a voice service.

However, the above limitation of being able to transmit only a certain transmission capacity of data in one transmission channel results in a disadvantage that it takes a considerable time to transmit a large amount of data.

In the case of transmitting video data as well as audio, if a single service option is designated and transmitted as in the related art, a transmission delay may occur or an abnormality in call quality may occur.

Accordingly, the present invention is to solve the above problems, by transmitting the audio and video data using different service options, respectively, a method of transmitting data between mobile communication terminals for transmitting the video data while maintaining the existing high quality voice The purpose is to provide.

A feature of the data transmission method between mobile communication terminals according to the present invention for achieving the above object is that in a mobile communication terminal capable of transmitting voice data and video data, the voice data is passed through the base station controller through the switch using a vocoder algorithm The primary traffic channel is allocated to transmit and receive, and the video data is allocated and transmitted through the secondary traffic channel passing through the network interlocking device connected to the exchange.

According to the present invention, since audio and video data transmission between CDMA mobile communication terminals are transmitted using different channels, video data can be transmitted while maintaining the existing audio quality in real time without delay.

1 is a diagram illustrating voice data and video data transmission in a CDMA network according to the present invention.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

A preferred embodiment of a data transmission method between mobile communication terminals according to the present invention will be described with reference to the accompanying drawings.

To transmit and receive audio and video data between CDMA mobile communication terminals capable of video transmission and reception, a multiplex option is used to allocate audio data to a primary traffic channel and video data to a secondary traffic channel. Implementation, and define service option separately.

1 is a diagram illustrating voice and video data transmission in a CDMA network according to the present invention.

As shown in FIG. 1, separate service options are required to simultaneously transmit and receive audio and video.

First, voice allocates data using a vocoder algorithm such as QCELP and EVRC to a primary traffic channel and transmits and receives using the existing voice data service as it is.

As shown in FIG. 1, voice data transmission is performed within a base transceiver station (BTS) within the same cell radius according to a conventional communication method, and a base station controller (BSC) when talking outside the cell radius range. Call between the base stations through the base station and, if outside the range of the same base station controller, through the base station controller through the mobile switching center (MSC).

The video is transmitted and received using a data service by allocating data using algorithms such as H.261, H.263, and moving picture coding expert group (MPEG) to the secondary traffic channel.

In this case, service options for voice and data services are determined and used.

As shown in FIG. 1, image data transmission is transmitted and received via an interworking function (IWF) connected to an exchange.

It is linked with data service network for video transmission and reception.

Video data transmission has a longer network path than voice data transmission, but data such as Radio Link Protocol (RLP), Transmission Control Protocol / Internet Protocol (TCP / IP), etc. Because it oversees the communication protocol, it must go this route.

However, the data can be protected by mechanisms such as error correction and retransmission through such a path, but data transmission delay may occur when the network path is in a bad situation.

Therefore, in a video call through a CDMA mobile communication terminal, at least voice should be called in real time, and for this, voice uses a conventional method.

In a place where the radio wave condition is bad, even if a little voice data is difficult to recover, there is no problem at the time of call.

Therefore, the voice call is a problem in the case of a high speed network configuration or an area where radio waves are weak when using a data service.

Therefore, the transmission of voice data is used according to the conventional method, and the image data should be maintained even if there is a slight transmission delay, so the radio line protocol, the serial line interface protocol, and the two-point protocol (Serial Line Interface Protocol) It is desirable to transmit and receive data using a data service including protocols such as / Point-to-Point Protocol (SLIP / PPP), transmission control protocol, and network protocol.

As described above, since the transmission of the audio and video data uses different paths, the audio and video data need to be separately defined as mentioned above. For this purpose, the terminal and the base station must add software for the service.

The video data is allocated to the secondary traffic channel and used in the IS-95B standard to allocate more code frames to the supplemental code channel.

In the IS-2000, additional channels can be allocated and used.

The data transmission method between mobile communication terminals according to the present invention as described above has the following advantages.

By transmitting the voice and video data transmissions between CDMA mobile communication terminals by specifying different service options, the video data can be transmitted in real time without delay.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (1)

In a mobile communication terminal capable of transmitting audio data and video data, The voice data is allocated to a primary traffic channel passing through an exchange through a base station controller through a vocoder algorithm, and then transmitted and received. And transmitting and receiving the video data by allocating and transmitting a secondary traffic channel through a network interlocking device connected to an exchange.