WO2004086782A1

WO2004086782A1 - Video alerting method for asynchronous wireless telecommunication system

Info

Publication number: WO2004086782A1
Application number: PCT/KR2004/000676
Authority: WO
Inventors: Yang-Myung Cha
Original assignee: Hurim Interactive Corp.
Priority date: 2003-03-25
Filing date: 2004-03-25
Publication date: 2004-10-07
Also published as: CN1795686A; JP2006523068A; KR20040083825A

Abstract

Provided is a video alerting method in an asynchronous wireless telecommunication system and a computer-readable recording medium for recording the video alerting method. In the video alerting method includes the steps of: a) at a called party, establishing video to be transmitted to a call transmitting mobile station during call alerting; b) determining whether a call receiving mobile station is registered for the video alerting service, when the call transmitting mobile station originates a call, and allocating a videophone call channel between the call transmitting mobile station and a video alerting server before opening a session for a videophone between the call transmitting mobile station and a call receiving mobile station; and c) transmitting the video established for the call receiving mobile station to the call transmitting mobile station through the videophone channel.

Description

Description VIDEO ALERTING METHOD FOR ASYNCHRONOUS

WIRELESS TELECOMMUNICATION SYSTEM

Technical Field

[1] The present invention relates to a video alerting method for an asynchronous wireless telecommunication system and a computer-readable recording medium for recording a program that implements the method. More particularly, when call alerting occurs in a next-generation asynchronous wireless telecommunication, music pre- established by a called party is transmitted to a calling party's transmitting mobile station (MS) independently or along with video, such as a still image or a moving picture, transmitted onto a screen of the calling party's call transmitting mobile station. The service that transmits audio data, such as music, to the call transmitting mobile station is called audio alerting service, and the service that transmits video data onto the screen of the call transmitting mobile station is called video alerting service. The Audio alerting service may be also referred to as sound color ring service, and the video alerting service may be also referred to as image color ring service. The asynchronous wireless telecommunication system includes the 3 Generation Partnership Projects (3GPP), Universal Mobile Telecommunication Service (UMTS) and Wideband Code Division Multiple Access (W-CDMA).

Background Art

[2] In the current wireless telecommunication systems, it is possible to establish and present particular sound in a call receiving mobile station (MS) independently or along with particular letters, which is called Call Name Presentation (CNAP). Although sound generated in a network of the actual international standards can be used, in most cases, commercial telecommunication service providers and mobile station manufacturers establish and use call receiving sounds in mobile stations provided by them.

[3] t wever, most of the current mobile stations are equipped with simple multimedia functions. In the fiiture, all mobile stations will have functions for Video on Demand (VOD) adopting Moving Picture Experts Group (MPEG)-4 and Junctions for display phone.

[4] Despite the fact, conventional wireless telecommunication network could not transmit video for call alerting due to a problem of large video sizes. Moreover, since a voice-centered circuit network and a packet data-centered packet network are operated independently from each other, the subscribers' needs for multimedia services, such as, video alerting service, are hardly satisfied.

[5] To keep pace with the increasing multimedia Junctions added to mobile stations and the enhancement of the Junctions, it will be advantageous if video data, such as a still image or a moving picture, is transmitted to a screen of a mobile station capable of implementing the video in various colors, along with a call receiving sound simultaneously during call alerting. A called party can show a picture of himself/herself to a calling party in advance by transmitting the picture pre-established by himself/herself to the calling party. This way, the called party can express himself/herself with his/her own characters. At present, a new method that can achieve the goal is needed desperately. Disclosure of Invention

[6] It is, therefore, an object of the present invention to provide a video alerting method for transmitting video data, such as a still image or a moving picture, independently or along with audio data, such as music, during call alerting in an asynchronous wireless telecommunication, and a computer-readable recording medium for recording a program that implements the video alerting method. The video and the audio data are pre-established by a called party.

[7] In accordance with one aspect of the present invention, there is provided a video alerting method for providing video alerting service in an asynchronous wireless telecommunication system, including the steps of: a) at a called party, establishing video to be transmitted to a call transmitting mobile station during call alerting; b) determining whether a call receiving mobile station is registered for the video alerting service, when the call transmitting mobile station originates a call, and allocating a videophone call channel between the call transmitting mobile station and a video alerting server before opening a session for a videophone between the call transmitting mobile station and a call receiving mobile station; and c) transmitting the video established for the call receiving mobile station to the call transmitting mobile station through the videophone channel.

[8] In accordance with another aspect of the present invention, there is provided a computer-readable recording medium for recording a program that implements a video alerting method, the method comprising the steps of: a) at a called party, establishing video to be transmitted to a call transmitting mobile station during call alerting; b) determining whether a call receiving mobile station is registered for the video alerting service, when the call transmitting mobile station originates a call, and allocating a videophone call channel between the call transmitting mobile station and a video alerting server before opening a session for a videophone between the call transmitting mobile station and a call receiving mobile station; and c) transmitting the video established for the call receiving mobile station to the call transmitting mobile station through the videophone channel.

[9] Conventional wireless telecommunication networks have a difficulty in transmitting video during call alerting due to large video sizes. As the wireless telecommunication networks are advanced, it becomes possible to transmit voice and data simultaneously (Simultaneous Voice and Data: SVD) in a Code Division Multiple Access (CDMA)-2000 system. In the systems of the 3 Generation Partnership Projects (3GPP), a Universal Mobile Telecommunication Service (UMTS), and a Wideband CDMA (W-CDMA), mobile stations are equipped with Junctions for transmitting video during call alerting by enhancing transmission rate.

[10] In accordance with the present invention, a call receiving mobile station can transmit video including a still image and moving picture to a call transmitting mobile station during call alerting by connecting a voice-centered circuit network and a packet data-centered packet network and building a server, i.e., video alerting server, in the packet network. Particularly, in case of W-CDMA, if there is a mutual interface between the circuit network and the packet network, it is much easier to transmit the video from the call receiving mobile station to the call transmitting mobile station during call alerting.

[11] In other words, in the present invention, 3G-324M videophone system defined in the international standard of W-CDMA, before opening the session between a transmitting mobile station (calling party) and a receiving mobile station (called party), multimedia information (e.g., still image and moving picture predetermined by the receiving mobile station) defined by the receiving mobile station is transmitted to the transmitting mobile station. In order to provide the service, a part of operations of the core network may be modified.

Description of Drawings

[12] The above and other objects and features of the present invention will become apparent from the following description of the preferred embodiments given in conjunction with the accompanying drawings, in which:

[13] Fig. 1 is an exemplary diagram illustrating an asynchronous wireless telecommunication system to which the present invention is applied;

[14] Fig. 2 is a block diagram showing 3G-324M video telephone system to which the present invention is applied; [15] Fig. 3 is a flowchart illustrating 3G-324M video telephone setting method to which the present invention is applied;

[16] Fig. 4 is a diagram depicting multimedia data for video alerting service;

[17] Fig. 5 is a diagram showing MP4 file formatting method;

[18] Fig. 6 a flow chart describing the video alerting method in accordance with an embodiment of the present invention; and

[19] Fig. 7 is a flow chart describing the video alerting method in accordance with an embodiment of the present invention.

Best Mode

[20] Other objects and aspects of the invention will become apparent from the following description of the embodiments with reference to the accompanying drawings, which is set forth hereinafter.

[21] Fig. 1 is an exemplary diagram illustrating an asynchronous wireless telecommunication system to which the present invention is applied. Mobile stations (MS) 11 and 18 includes wireless telecommunication terminals, such as Personal Digital Assistants (PDA), laptop computers, cellular phones and Personal Communication Service (PCS) phones, and includes terminals for the next-generation wireless telecommunication services, such as, International Mobile Telecommunication (IMT-2000) and Universal Mobile Telecommunication Service (UMTS). The mobile stations 11 and 18 can display video, e.g., still images or moving pictures, independently or along with a call receiving sound. In particular, the W-CDMA system includes interface between a circuit network and a packet network, e.g., a general packet radio service (GPRS) network, the mobile stations 11 and 18 can provide both of a circuit based voice communication service and a pack service.

[22] Here, the circuit network is a network for providing a voice communication service and includes base station 12 and a mobile switching center. The GPRS network is a network for providing a packet service and includes base station-related device 12, a packet exchanging unit, e.g., a serving GPRS support node (SGSN)/gateway GPRS supporting node (GGSN) 16

[23] A Base Transceiver System (BTS)-related device 12 includes a BTS and a BTS

System Controller (BSC). The BTS-related device 12 performs a voice service between mobile stations 11, 18 and a mobile switching center (MSC), and transmits data between the mobile stations 11, 18 and SGSN/GGSN 16 and performs buffering. It also performs paging when data are transmitted to the mobile stations 11 and 18 in an IP network. Hereafter, the Junction of each element of an asynchronous wireless telecommunication system will be described.

[24] The BTS supports the circuit based telephone service and the packet service, transmits a radio signal or traffic to the circuit network or the GPRS network, or transmits voice data of the circuit network or the packet data of the GPRS network to the mobile stations 11, 18.

[25] The BSC accommodates the Junctions of a conventional mobile switching center

(MSC) 13. It controls and manages one or more BTSs for their traffics related to call processing and signal type, mobility and mobile stations.

[25] The packet exchanging unit is referred to as a serving GPRS (general packet radio service) support node in 3G network, e.g., a wideband code division multiple access (W-CDMA), and a packet data support node (PD) in 2G CDMA network. The packet network gateway is referred to as a gateway GPRS support node (GGSN) in the 3G CDMA network, and a packet data gateway node (PDGN) in the 2G CDMA network.

[27] The SGSN 16 is a service node of a packet network that provides a packet service, and performs transmission of the signal and traffic between the BTS and the packet network gateway. The SGSN 16 performs mobility management and session management for the user, and operates as an end point of the GPRS tunneling protocol (GTP).

[28] The GGSN 16 performs a gateway Junction of the GPRS network and interface with a video alerting server 17.

[29] A home location register (HLR) 14 has subscriber information, IP priority order, resources interdomain service and information on whether an authority for the in- terdomain service is used or not.

[30] The wireless telecommunication management server 15 is in charge of such

Junctions as Authentication, Authorization and Accounting (AAA), subscriber authentication, authority verification, and charging. It processes an authentication request and a charge message that are demanded by the SGSN/GGSN 16

[31] Hereafter, the video alerting service, which can be also referred to as image color ring service, will be described more in detail in the asynchronous wireless telecommunication system of the present invention, such as the W-CDMA.

[32] In order to provide the video alerting service of the present invention, the MSC 13 provides a voice service between a call transmitter and a called party in the asynchronous wireless telecommunication system. The HLR 14 maintains location information of a mobile terminal subscriber and value added service information.

[33] Meanwhile, to provide the video alerting service of the present invention, the SGSN/GGSN 16 provides data service in the asynchronous wireless telecommunication system, and the video alerting server 17 provides the video alerting service of the present invention.

[34] To provide the video alerting service of the present invention, the content providing server 20 makes the called party access to the video alerting server 17 through a Web server 21, a Wireless Application Protocol (WAP) server 22, and an Automatic Response Service (ARS) 23 so that the called party could select a content to be displayed on a screen of the call transmitter's mobile station 11 when the called party receives a call.

[35] Therefore, the called party can transmit and display certain video, e.g., a still image or a moving picture, to the screen of the transmitting mobile station 11 during call alerting by accessing to the video alerting server 17 through the asynchronous wireless telecommunication network or the Internet with the receiving mobile station 18 or a user terminal, such as personal computer (PC) and establishing the still image or moving picture to be transmitted to the transmitting mobile station 11 of a calling party in advance. There are many accessing methods using the Web server 21, WAP server 22 and ARS 23 through the Internet.

[36] First, the video alerting service in a general communication system will be described, and then the video alerting service in a system based on 3G-324M a videophone standard will be described.

[37] The video alerting server 17, which transmits video data, accesses the IP network in order to access the SGSN/GGSN 16 or the No. 7 signaling network in order to access the HLR 14 (or the MSC 13).

[38] The video alerting service is started by the MSC 13 inquiring the HLR 14 of subscriber's information. The subscriber's information is transmitted to the video alerting server 17, the video alerting server 17 transmits the video data to the transmitting mobile station 11 through the SGSN/GGSN 16 based on the subscriber's information

[39] The video alerting service of the present invention is based on the premise that simultaneous voice & data (SVD) transmission is possible in the radio transmission section. In other words, data and voice could be transmitted simultaneously in the radio transmission section to provide the video alerting service of the present invention.

[40] If the call transmitting mobile station 11 calls the call receiving mobile station 18 through the MSC 13, the MSC 13 checks the capability of the mobile stations 11 and 18, such as subscriber's location information and value added service, and notifies the BTS of the VP mode, which is a method of providing the SVD Junction. The BTS of the BTS-related devices 12 recognizes that video is transmitted during the call alerting. Then, it pages the call receiving mobile station 18 and assigns communication lines through the interface with the SGSN/GGSN 16

[41] The MSC 13 receives a response from the BTS and then it is cooperated with the video alerting server 17 which processing the video during call alerting through the HLR 14 or the MSC 13. The video alerting server 17 transmits the pre-established video determined by the called party to the SGSN/GGSN 16 The SGSN/GGSN 16 forms a session with the BTS according to the network synchronization.

[42] Finally, the BTS processes the call alerting sound generated in the MSC 13 and other calls. The SGSN/GGSN 16 transmits the video information, which is the video determined by the called party, after receiving it from the video alerting server 17.

[43] An SVD data channel is assigned between the call transmitting mobile station 11 and the SGSN/GGSN 16, and the video alerting server 17 transmits the video predetermined by the called party to the SGSN/GGSN 16 The determined video is transmitted to the call transmitting mobile station 11 through the SVD data channel.

[44] During the video alerting, the SVD data channel assigned between the SGSN/

GGSN 16 and the call transmitting mobile station 11 is used. This is because that the video data for video alerting is of a large size and the control signals processed in the conventional MSC 13 cannot provide messages sufficiently to send the video.

[45] The video displayed on the screen of the call transmitting mobile station 11 should be of a simple form, such as wavelet videos that can show small-size natural video and videos of Simple Image Service (SIS). The SIS is a service that transmits/receives simple images, e.g., characters from animation films and avatars. The service is on active service in Korea at present. If the call transmitting mobile station 11 has a Junction of Moving Picture Experts Group (MPEG)-4, MPEG video can be played back. Each mobile station 11 or 18 has a different video processing Junction and different size and color of a liquid crystal display (LCD). So, the video alerting server 17 should manage these differences.

[46] Some mobile stations 11 and 18 can transmit streaming data. These mobile stations

11 and 18 can afford to transmit and receive natural video. That is, they can process data of 3GPP Standard Multimedia formats, such as an MPEG layer 4 (MP4) format and a 3GP format.

[47] If the mobile station at the called party has an established alerting sound, it can process audio data as well as the video transmitted from the video alerting server 17. That is, during call alerting, audio data established by a called party are transmitted, which is referred to as a sound color ring service, to the call transmitting mobile station 11 along with the pre-established video. The service that transmits audio data, i.e., sound, is called audio alerting service, which can be also referred to as sound color ring service. The audio alerting service can be provided to the call transmitting mobile station 11 independently from the video alerting service.

[48] The 3G-324M protocol will be described with reference to Fig. 2.

[49] The 3G-324M protocol is a standard for complementing H.324 which is a standard for a videophone in a wired network and defined by ITU-T. The 3G-324M protocol is defined by 3GPP which performs standardization of UMTS mobile communication. In other words, 3G-324M defines a video/audio codec, a multiplexing, a transmission protocol and an adaptation.

[50] The video codec of 3G-324M defines H.253 basically and recommends MPEG-4 additionally. The audio codec of 3G-324M defines adaptive multi-rate (AMR) codec which is a basic codec defined by the 3GPP.

[51] Since the 3G-324M is a videophone protocol for a circuit network, the 3G-324M performs multiplexing and demultiplexing based on H.223 defined by ITU-T. The control at the start of or during communication is performed based on H.245

[52] For a call set up of the videophone, the transmitting mobile station sets up a call of a radio bearer, and then sets up a call of the 3G-324M. The W-CDMA system uses unrestricted digital information (UDI), which is a transparent connection type, as the circuit data. For the videophone, transmission/reception rate of the circuit data is 64kbps symmetrically in quarter common intermediate format (QCIF) (176 ' 144). In other words, 10 frames are transmitted per a second.

[53] In order to set up 3G-324M videophone, the radio bearer is set up as 64kbps circuit data in UMTS, and then control information is negotiated peer-to peer based on H.245. In order for interface with a public switched telephone network, a call is processed based on No. 7 signaling in the circuit switched domain of the core network.

[54] in order to provide the video alerting service, the video alerting server 17 can be interfaced with the conventional MSC 13 based on No. 7 or BICC. BICC is a signaling protocol between soft switches and transmits the bearer information having various multimedia data effectively.

[55] The HLR 14, which is database storing user information and is interface with the

MSC 13, stores information on whether the user subscribes the video alerting service or not. If the user subscribes the video alerting service, the MSC transmits a call to the video alerting server 17. A session of 3G-324M is opened in the receiving mobile station 18, the call is set up from the transmitting MSC to the receiving MSC.

[56] In order to provide the video alerting service, the transmitting MSC sets up a call

3G-324M to the video alerting server 17 and then to the transmitting mobile station. The video alerting server 17 includes information on the mobile stations capable of supporting 3G-324M.

[57] In general, it takes a lot of time to set up a call for end-to-end videophone.

However, in the present invention, the MSC of the core network processes the call, which decreases time for call set up. In this case, the mobile station is not necessary to be modified, on the contrary, the call set up unit is changed from the video alerting server 17 to the transmitting mobile station 11. In order for high-speed access, when setting up a call, the video alerting server 17 uses a predetermined value as a capability negotiation which is processed in H.245.

[58] In the present invention, two multimedia processing methods are used.

[59] First, in order for interface with the 3G-324M, the multimedia data stored by the user are divided into video stream and speech stream, stored in the video alerting server 17 and then transmitted to the transmitting mobile station 11.

[60] Next, the multimedia data are stored as a file format in the video alerting server 17 and transmitted to the transmitting mobile station 11.

[61] The video alerting server 17 includes a program for processing 3G-324M and the database for storing the multimedia data for each of the users. Data structure for the stored multimedia data is shown in Fig. 4.

[62] The multimedia data stored in the video alerting server 17 includes a file header, a video stream and a speech stream. The file header includes information on a video codec (e.g., H.253), a speech codec (e.g., AMR), a length of the multimedia data, a vide image resolution (e.g., QCIF), a speech code sampling rate (e.g., 63kbps) and the first storing date.

[63] The use of the data structure as shown in Fig. 4 has a advantage in that the data can be processed without modification of the mobile station, but has a drawback in that the multimedia data can not be interchanged in the video alerting server 17. In other words, when editing or transmitting the multimedia contents in Internet, a predetermined tool should be used instead of a general authoring tool.

[64] On the contrary, the use of Internet or international file format allows the multimedia contents to be authorized and transmitted easily. F wever, since the multimedia content having the file format is not normal 3G-324M call, the mobile station should have a software block for converting the multimedia content having the file format to the normal 3G-324M call. Also, H.245 signaling protocol can recognize the file format and play the multimedia content having the file format, which can be easily implemented by modifying the parameters.

[65] The file format defined in the present invention is illustrated in Fig. 5 and interchangeable with 3Gpp standard.

[66] MP4 file format and 3GP file format defined in packet streaming service (PSS) of

3GPP can be used. If the 3GP is used, since the 3GP can be interchanged with the VOD file format, the contents can be easily edited.

[67] For interface with 3G-324M defined by 3GPP, H.323 defined by the packet network, 3GCF defined by 3GPP2 and SIP multimedia telephony of 3GPP, H.253 and G.723.1 may be used for multimedia, and MP4 file format can be used.

[68] Fig. 6 is a flow chart describing the video alerting method in accordance with an embodiment of the present invention.

[69] As shown, before it is open videophone session between the transmitting mobile station 11 and the receiving mobile station 18, multimedia information defined by the receiving mobile station (called party) is transmitted to the transmitting mobile station based on 3G-324M standard.

[70] A contents providing server 20 makes a called party access to the video alerting server 17 through the Web server 21, WAP server 22, and ARS 23. Then, it makes the called party to select a video content to be displayed on a screen of the call transmitting mobile station 11 when the called party receives a phone call. The selected video can be updated later on.

[71] The Web server 21 is used for the called party to select and determine a content to be used for video alerting service on the Internet. The WAP server 22 is used for the called party to select the contents to be used for video alerting service from radio data. The ARS 23 is used for the called party to select the content to be used for video alerting service from wired ARS.

[72] If the called party wants to transmit video to the screen of the call transmitting mobile station 11 during call alerting, the called party can establish the desired video to be transmitted to the call transmitting mobile station 11 or update a pre-established video by accessing to the video alerting server 17 through the Internet or a asynchronous wireless telecommunication network with the call receiving mobile station 18 or a user terminal 19. The access through the Internet includes many methods utiliing the Web server 21, WAP server 22 and ARS 23.

[73] To provide the video alerting service, the call server who wants to transmit video to the call transmitting mobile station 11 during call alerting accesses to video alerting server 17 through the asynchronous wireless telecommunication network, or the Internet with the call receiving mobile station 18 or the user terminal 19, and establishes a desired video to be transmitted to the call transmitting mobile station 11 in advance. It is obvious that there are many Internet accessing method utiliang the Web server 21, WAP server 22 and ARS 23.

[74] Subsequently, at steps S601 and S602, the call transmitting mobile station 11 transmits calls to the call receiving mobile station 18. At step S603, the MSC inquires subscriber's location information and whether any value added service is subscribed to the HLR 14.

[75] At step S604, the MSC recognizes that the called party is registered for the video alerting service and, at step S605, sets a 3G-324M call to the video alerting server 17 and assigns a data channel for the 3G-324M call o the mobile station 11.

[76] If the 3G-324M videophone call is established between the video alerting server 17 and the mobile station, and a data channel for the 3G-324M videophone call is assigned, at step 607, the video alerting service server 17 transmits the predetermined video to the mobile station 11. At step S608, the MS decodes the video to generate restored video data and displays the restored video data on a display unit.

[77] At step S609, the transmitting MSC sets up a 3G-324M videophone call to the receiving MSC, at step S610, the receiving MSC requests the receiving MS to assign a data channel for the 3G-324M videophone call. If the session for the videophone call is formed, at step S611, it is released the 3G-324M videophone call between the transmitting MSC and the video alerting server 17. Since subsequent procedures are the same as the normal communication call processing of the 3G-324M videophone call, Jurther description will not be provided herein.

[78] If the called party has pre-established audio data, such as music, in advance, it is possible to transmit the audio data along with the video during call alerting. That is, it is possible to provide both video alerting service and audio alerting service at the same time.

[79] If the alerting music is not pre-established, only the video will be displayed on the screen of the call transmitting mobile station 11, or the call transmitting mobile station 11 may provide basic music in itself along with the transmitted video. The video displayed on the screen of the call transmitting mobile station 11 may be gone auto- matically when the communication is started or it may be displayed until the end of the communication. Also the video transmitted during the call alerting may be stored in a memory of the call transmitting mobile station 11 so that it can be shown again or transmitted to another mobile station at any time.

[80] Fig. 7 is a flow chart describing the video alerting method. A contents providing server 20 makes a called party access to the video alerting server 17 through the Web server 21, WAP server 22, and ARS 23. Then, it makes the called party to select a video content to be displayed on a screen of the call transmitting mobile station 11 when the called party receives a phone call. The selected video can be updated later on.

[81] The Web server 21 is used for the called party to select and determine a content to be used for video alerting service on the Internet. The WAP server 22 is used for the called party to select the contents to be used for video alerting service from radio data. The ARS 23 is used for the called party to select the content to be used for video alerting service from wired ARS.

[82] If the called party wants to transmit video to the screen of the call transmitting mobile station 11 during call alerting, the called party can establish the desired video to be transmitted to the call transmitting mobile station 11 or update a pre-established video by accessing to the video alerting server 17 through the Internet or a asynchronous wireless telecommunication network with the call receiving mobile station 18 or a user terminal 19. The access through the Internet includes many methods utiliing the Web server 21, WAP server 22 and ARS 23.

[83] To provide the video alerting service, the call server who wants to transmit video to the call transmitting mobile station 11 during call alerting accesses to video alerting server 17 through the asynchronous wireless telecommunication network, or the Internet with the call receiving mobile station 18 or the user terminal 19, and establishes a desired video to be transmitted to the call transmitting mobile station 11 in advance. It is obvious that there are many Internet accessing method utiliang the Web server 21, WAP server 22 and ARS 23.

[84] Subsequently, at steps S701 and S702, the call transmitting mobile station 11 transmits calls to the call receiving mobile station 18. At step S703, the MSC inquires subscriber's location information and whether any value added service is subscribed to the HLR 14.

[85] At step S704, the MSC recognizes that the called party is registered for the video alerting service and, at step S705, it requests the BTS to assign SVD data channels thereto. Then, at step S706, the BTS transmits an SVD data channel assignment request message to the call transmitting mobile station 11 and, at step S707, it assigns SVD data channels through the interface with the SGSN/GGSN 16 At step S708, it informs the MSC that the SVD data channel assignment is completed successfully.

[86] The SVD data channel assignment request message that is transmitted from the

BTS to the call transmitting mobile station 11 informs that a video is to be transmitted during call alerting to a specific field of an ECAM which notifies the beginning of SVD and establishes a channel. Then, the call transmitting mobile station 11 recognizes the specific field of the ECAM and thereby it is informed that the video is to be transmitted during the call alerting and activates the video decoder in advance.

[87] At step S709, when an SVD data channel for transmitting the video is assigned to the call transmitting mobile station 11, the MSC requests the video alerting server 17 to transmit the video predetermined by the called party. At step S710, the video alerting server 17 transmits the predetermined video to the SGSN/GGSN 16

[88] At step S711, the SGSN/GGSN 16 receives the video from the video alerting server 17 and transmits it to the BTS by forming a session with the BTS based on network synchronization. Subsequently, at step S712, the BTS receives the video from the SGSN/GGSN 16 and transmits it to the call transmitting mobile station 11. At step S713, the call transmitting mobile station 11 receives the video from the BTS and decodes and outputs it onto a screen thereof. Since subsequent procedures are the same as the normal communication call processing, Jurther description will not be provided herein.

[89] If the called party has pre-established audio data, such as music, in advance, it is possible to transmit the audio data along with the video during call alerting. That is, it is possible to provide both video alerting service and audio alerting service at the same time.

[90] If the alerting music is not pre-established, only the video will be displayed on the screen of the call transmitting mobile station 11, or the call transmitting mobile station 11 may provide basic music in itself along with the transmitted video. The video displayed on the screen of the call transmitting mobile station 11 may be gone automatically when the communication is started or it may be displayed until the end of the communication. Also the video transmitted during the call alerting may be stored in a memory of the call transmitting mobile station 11 so that it can be shown again or transmitted to another mobile station at any time.

[91] The video alerting method of the present invention can be embodied as a program and stored in a computer-readable recording medium, such as CD-ROM, RAM, ROM, floppy disks, hard disks, and magneto-optical disks.

[92] In addition, the technology of the present invention can be used as an effective means for publicity on the part of a called party. The called party can produce public information, e.g., company advertisements and invitation to an exhibition or a fair, in the forms of video or audio data and transmit them to call transmitting mobile stations.

[93] While the present invention has been described with respect to certain preferred embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the scope of the invention as defined in the following claims.

Claims

[1] A video alerting method for providing video alerting service in an asynchronous wireless telecommunication system, comprising the steps of: a) at a called party, establishing video to be transmitted to a call transmitting mobile station during call alerting; b) determining whether a call receiving mobile station is registered for the video alerting service, when the call transmitting mobile station originates a call, and allocating a videophone call channel between the call transmitting mobile station and a video alerting server before opening a session for a videophone between the call transmitting mobile station and a call receiving mobile station; and c) transmitting the video established for the call receiving mobile station to the call transmitting mobile station through the videophone channel.

[2] The method as recited in claim 1, Jiirther comprising the steps of: d) setting up a videophone call between at the call transmitting mobile switching center (MSC) and a call receiving MSC, and setting up a videophone call between the call receiving MSC and the call receiving mobile station; e) releasing the videophone call between the call transmitting MSC and the video alerting server; and f) allowing communication between the call transmitting mobile station and the call receiving mobile station, transmitting video to the call transmitting mobile station and the call receiving mobile station.

[3] The method as recited in claim 1, Jiirther comprising the step of: d) transmitting audio data pre-established for the call receiving mobile station to the call transmitting mobile station along with the established video during call alerting.

[4] The method as recited in claim 3, wherein the videophone is based on 3G-324M videophone standard.

[5] The method as recited in claim 1, wherein the call transmitting mobile station displays the video independently or along with the audio data during call alerting or both call alerting and communication, or the call transmitting mobile station displays the video along with audio data provided to the call transmitting mobile station basically during call alerting or both call alerting and communication.

[6] The method as recited in claim 5, wherein the video is a still image or a moving picture including character images, natural images, and background images.

[7] The method as recited in claim 4, wherein the video is transmitted to the call transmitting mobile station during call alerting or both call alerting and communication by utiliang a channel assignment message that makes the call transmitting mobile station enter a traffic channel in the asynchronous network.

[8] The method as recited in claim 7, wherein if the channel assignment message is received from the asynchronous network, the call transmitting mobile station prepares to decode the video; displays the video independently or along with audio data during call alerting; or displays the video along with the basic audio data provided to the call transmitting mobile station basically, and the call transmitting mobile station makes the video displayed on a screen of the call transmitting mobile station disappear automatically when the call transmitting mobile station begins communication; maintains the video until the end of communication; or stores the video in a memory during call alerting.

[9] A computer-readable recording medium for recording a program that implements a video alerting method, the method comprising the steps of: a) at a called party, establishing video to be transmitted to a call transmitting mobile station during call alerting; b) determining whether a call receiving mobile station is registered for the video alerting service, when the call transmitting mobile station originates a call, and allocating a videophone call channel between the call transmitting mobile station and a video alerting server before opening a session for a videophone between the call transmitting mobile station and a call receiving mobile station; and c) transmitting the video established for the call receiving mobile station to the call transmitting mobile station through the videophone channel.

[10] The computer-readable recording medium as recited in claim 9, Jiirther comprising the steps of: d) setting up a videophone call between at the call transmitting mobile switching center (MSC) and a call receiving MSC, and setting up a videophone call between the call receiving MSC and the call receiving mobile station; e) releasing the videophone call between the call transmitting MSC and the video alerting server; and f) allowing communication between the call transmitting mobile station and the call receiving mobile station, transmitting video to the call transmitting mobile station and the call receiving mobile station.

[11] The computer-readable recording medium as recited in claim 9, Jiirther comprising the step of: d) transmitting audio data pre-established for the call receiving mobile station to the call transmitting mobile station along with the established video during call alerting.