WO2004084566A1

WO2004084566A1 - Video alerting method for synchronous wireless telecommunication system

Info

Publication number: WO2004084566A1
Application number: PCT/KR2004/000596
Authority: WO
Inventors: Yang-Myung Cha
Original assignee: Hurim Interactive Corp.
Priority date: 2003-03-20
Filing date: 2004-03-18
Publication date: 2004-09-30
Also published as: KR20040082758A

Abstract

Provided is a video alerting method in a synchronous wireless telecommunication system and a computer-readable recording medium for recording the video alerting method. In the video alerting method of the present research, video predetermined by a called party, such as a still image or a moving picture, is transmitted to a call transmitting mobile station independently or along with a pre-established audio data, such as music, during call alerting in the synchronous wireless telecommunication system, e.g., CDMA-2000. The video alerting method includes the steps of: a) a called party establishing video to be transmitted to a call transmitting mobile station during call alerting; b) allocating a channel for transmitting both voice and data simultaneously between the call transmitting mobile station and the synchronous network; and c) transmitting the video established for the call receiving mobile station to the call transmitting mobile station through the channel where the voice and data can be transmitted simultaneously in the synchronous network.

Description

VIJOJL O Al-. Jc- 11J C_r JVl-_ l__lϋ-0 J. OK.

WI E -SSS TELECOMMUNICATION SYSTEM

Technical Field [1] The present invention relates to a video alerting method for a synchronous 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 synchronous 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 synchronous wireless rd telecommunication system includes the 3 Generation Partnership Projects-2 (3GPP2) International Mobile Telecommunication 2000 (IMT-2000) and the Code Division Multiple Access 2000 (CDMA-2000).

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] However, most of the current mobile stations are equipped with simple multi-media functions. In the future, all mobile stations will have functions for Video on Demand (NOD) adopting Moving Picture Experts Group (MPEG)-4 and functions 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 functions added to mobile stations and the enhancement of the functions, 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 a synchronous 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 a synchronous wireless telecommunication system, including the steps of: a) a called party establishing video to be transmitted to a call transmitting mobile station during call alerting ; b) allocating channels for transmitting both voice and data simultaneously between the call transmitting mobile station and a synchronous network by making a transmitting mobile switching center (MSC) recognize that a call receiving mobile station is registered for the video alerting service, when the call transmitting mobile station calls the receiving mobile station; and c) transmitting the video established for the call receiving mobile station to the call transmitting mobile station through the channel where the voice and data can be transmitted simultaneously in the synchronous network.

[8] The video alerting method further includes a 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 daring call alerting.

[9] The video alerting method further includes a step of: e) mediating communication between the call transmitting mobile station and the call receiving mobile station through conventional call processing after the video alerting, and transmitting the video to the call transmitting mobile station continuously during the communication.

[10] 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, including the steps of: a) a called party establishing video to be transmitted to a call transmitting mobile station during call alerting; b) allocating channels for transmitting both voice and data simultaneously between the call transmitting mobile station and a synchronous network by making a transmitting mobile switching center (MSC) recognize that a call receiving mobile station is registered for the video alerting service, when the call transmitting mobile station calls the receiving mobile station; and c) transmitting the video established for the call receiving mobile station to the call transmitting mobile station through the channel where the voice and data can be transmitted simultaneously in the synchronous network.

[11] The computer-readable recording medium records the video alerting method further including a 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.

[12] The computer-readable recording medium records the video alerting method further including a step of: e) mediating communication between the call transmitting mobile station and the call receiving mobile station through conventional call processing after the video alerting, and transmitting the video to the call transmitting mobile station continuDUsly during the communication.

[13] 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 rd

(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 functions for transmitting video during call alerting by enhancing transmission rate. [14] 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. [15] 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. However, since the W-CDMA system requires an extra interface definition and a server for managing subscribers and contents, it will be out of the question in describing the technology of the present invention.

Description of Drawings

[16] 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:

[17] Fig. 1 is an exemplary diagram illustrating a synchronous wireless telecommunication system to which the present invention is applied; and

[18] Fig. 2 is a flow chart describing the video alerting method.

Mode for Invention

[19] 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.

[20] Fig. 1 is an exemplary diagram illustrating a synchronous 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.

[21] Desirably, a call transmitting mobile station 11 and a call receiving mobile station

18 use mobile Internet Protocol (IP), so it can always use the same IP address unless wireless Internet connection is terminated. In other words, although the mobile stations 11 and 18 in a packet data serving node (PDSN) move to another PDSN, a home agent (HA) (not shown) keeps information on the previous PDSN and makes data transmitted always to the mobile stations 11 and 18.

[22] In the mobile IP service, the PDSN 16 performs the functions of a foreign agent

(FA), and the home agent on a home network of the mobile station's IP address manages location information for a mobile IP and establishes a tunnel. [23] The home agent receives a registration request message from the mobile stations 11 and 18. Then, if fixed IP addresses are assigned statically, the home agent allows each of the assigned IP addresses to be used. If the IP addresses are assigned dynamically, the home agent allows the use of the assigned IP address by transmitting a registration reply message. In case that the PDSN area of the mobile stations 11 and 18 is changed, the change of the PDSN area is notified to the home agent.

[24] Referring to Fig. 1 again, a Base Transceiver System (BTS)-related device 12 includes a BTS, a BTS System Controller (BSC), and a Packet Control Function (PCF). The BTS-related device 12 transmits data between the mobile stations 11 and 18 and the PDSN 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 function of each element of a synchronous wireless telecommunication system will be described.

[25] The BSC accommodates the functions 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.

[26] The PCF may be in the inside or outside of the BSC system. It processes Internet

Protocol for processing data packets and uses an RP interface, which is an interface between a radio access network (RAN) and a packet data network. It provides virtual link connection for transmitting data on the RP interface and provides a tunneling function through the encapsulation and decapsulation of the General Routing Encapsulation (GRE) protocol. The RP interface is an access method between the RAN and a packet data network (PDN) for connecting the data of the mobile stations 11 and 18 from the RAN to the PDSN 16.

[27] The PCF, also, performs the functions of processing handof f, transmitting packet data charge information, and buffering the packet data on the RP interface. It carries out functions of buffering and packet segmentation that make link-layer packets transmitted through an air interface. The link-layer packets are transmitted from the PDSN 16 and transmitted to the mobile stations 11 and 18.

[28] The PDSN 16 is a service node of an IP-based packet network that provides a highspeed packet data service. It provides mobility of the packet data service and processes protocols related to various data.

[29] Besides, it performs a function of Internet Key Exchange (IKE) Radius processing, e.g., Key, SPI distribution and charging, a function of mobile IP, and a function of IP security processing. Also, the PDSN 16 processes Point-to-Point Protocol (PPPyGRE Protocol to process packets transmitted from the PCF. The PDSN 16 is an end point for performing PPP with the mobile stations 11 and 18. It receives identification (ID) and password of a subscriber, authenticates them, and notifies a wireless telecommunication management server 15 of the authentication.

[30] 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.

[31] The wireless telecommunication management server 15 is in charge of such functions 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 PDSN 16.

[32] Hereafter, the video alerting service, which can be also referred to as image color ring service, will be described more in detail in the synchronous wireless telecommunication system of the present invention, such as the Code Division Multiple Access (CDMA) 2000.

[33] 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 synchronous wireless telecommunication system. The HLR 14 maintains location information of a mobile terminal subscriber and value added service information.

[34] Meanwhile, to provide the video alerting service of the present invention, the PDSN

16 provides data service in the synchronous wireless telecommunication system, and the video alerting server 17 provides the video alerting service of the present invention.

[35] 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.

[36] 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 synchronous 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.

[37] 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. This method is defined as NP1 and NP2 in the CDMA-2000 Wireless Protocol.

[38] The SVD function is a technology that improves data-only lx-EN-DO to use voice and data simultaneously, and a VP mode is a structure that can transmit both voice and packet data simultaneously. The transmission method at a radio bearer, such as the NP mode, is determined in the BTS and the mobile stations 11 and 18, using control information in the interface between the BTS and a core network.

[39] 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 NP mode, which is a method of providing the SVD -unction. 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 PDSΝ 16. This process is defined in the 3GPP2.

[40] 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 PDSΝ 16. The PDSΝ 16 forms a session with the BTS according to the network synchronization.

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

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

[43] During the video alerting, the SVD data channel assigned between the PDSΝ 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. [44] For the call transmitting mobile station 11 to perform alerting together with the video transmitted from the network, a special method which is not defined in the current international standards should be defined separately. The method can be defined in an extended channel assignment message (ECAM) which informs the beginning of SVD and establishes a channel. In some cases, the method can be defined as the mobile stations 11 and 18 processing the SVD through service negotiation in the traffic state.

[45] The call transmitting mobile station 11 recognizes that the video is transmitted to it during the call alerting by recognizing a particular field of the ECAM, and it actives its video decoder in advance. Then, when the call transmitting mobile station 11 goes into a communication mode with the call receiving mobile station 18, the call transmitting mobile station 11 erases out the transmitted video and displays the state of communication, or maintains the transmitted video until the end of the communication. It is also possible for the call transmitting mobile station 11 to store the transmitted video in a memory and see it again later or transmit it to another mobile terminal through a multimedia messaging service (MMS).

[46] The VP mode which makes it possible to perform SVD in the CDMA-2000 uses a voice channel and an extra packet data channel simultaneously. A VP mode 1 is a mode that uses a conventional voice-centered fundamental channel (FCH) and a supplemental channel (SCH) simultaneously. In the NP mode 1, signaling for controlling the SCH which is a packet data-only channel is carried out through the FCH.

[47] Meanwhile, a NP mode 2 is a mode utilizing a dedicated control channel (DCCH).

The DCCH is an extra channel for processing control signals only. It controls the voice-centered FCH and the packet data-centered SCH. In case that a rate set is 1, the FCH can transmit data at a transmission rate of up to 9.6kbps and it can transmit both voice and data. If release is 0, the SCH can transmit data at up to 153.6kbps. In short, the NP mode is determined according to what channel is used for the signaling process. To the present invention, both VP modes 1 and 2 are applicable.

[48] Which VP mode is to be used is determined by the BTS or the mobile stations 11 and 18. If the mobile stations 11 and 18 determine one VP mode and use it, they can process multi-codes. That is, the mobile stations 11 and 18 can process diverse application services and large data by processing a plurality of Walsh codes.

[49] If the type of a VP mode is determined by the BTS, the SCH is assigned according to an Extracted Supplemental Channel Assignment Message (ESCAM) that is generated in the BTS of a radio communication section. [50] If the mobile stations 11 and 18 request an SCH, a Supplemental Channel Request Message (SCRM) is used. In the present invention, the call transmitting mobile station 11 is alerted and the video is transmitted to the call transmitting mobile station 11 by using a channel assignment message that makes the mobile stations 11 and 18 enter a traffic channel. An architecture of the aforementioned ECAM is as follows.

[51]

[52] If a traffic channel is assigned, detailed fields of the 'additional record fields' of the ECAM message are as follows.

[53]

[54] [55]

[56]

[57] The transmission of the video is informed to the call transmitting mobile station 11 along with call alerting by filling a particular value in a 'reserved' field which is established preliminary in the ECAM for assigning a traffic channel. That is, a value '1111111' is filled in the reserved field. Then, the call transmitting mobile station 11 receives the ECAM and prepares for the decoding of the video.

[58] In the mean time, the BTS transmits the ECAM and assigns an SCH to the call transmitting mobile station 11 by using a message, such as ESCAM. Then, the call transmitting mobile station 11 processes both FCH and SCH simultaneously and receives the video through the SCH.

[59] In case that the VP mode 1 is used, voice calls and control signals are transmitted through the FCH, and packet data including the video established in the call receiving mobile station 18 are transmitted through the SCH. This is because, conventionally, FCH cannot transmit large data.

[60] If video is provided as a background during voice or data communication, the

ESCAM that assigns an SCH defined in the CDMA-2000 can be used. To discriminate this from typical SCH assignment, specific fields are used as follows.

[61]

[62]

[63] The BTS shall include the following field if REV_CFG_INCLUDED is set to '1'. [64]

[65] The BTS shall include [NUM_REV_CFG_RECS + 1] occurrences of the following three fields if REV CFG INCLUDED is set to T.

[66]

[67] The BTS shall include NUM_REV_SCH occurrences of the following fields. [68]

[69]

[70] The BTS shall include the following field if FOR_CFG_INCLUDED is set to '1'. [71]

[72] The BTS shall include [NUM_FOR_CFG_RECS + 1] occurrences of the following fields if FOR CFG INCLUDED is set to '1'.

[73]

[74] NUM_SUP_SHO+l occurrences of the following fields [75]

[76]

[77] The BTS shall include NUM_FOR_SCH occurrences of the following fields [78]

[79]

[80] [81]

[82]

[83] [84]

[85]

[86] NUM_3X_CFG occurrences of the following record if 3X_SCH_JNFO JLNCL is included and set to T.

[87]

[88] [NUM_3X_REC + 1] occurrences of the following record: [89]

[90] [NUM_SUP_SHO + 1] occurrences of the following records: [91]

[92] As shown above, a background video can be transmitted and receive during communication by establishing a specific field, such as SCRM_SEQ_NUM, in the ESCAM.

[93] The video alerting server 17 transmits an image during call alerting and provides a convenient device for subscribers. It should be able to perform IP access to access to the PDSN 16 and should access to a No. 7 signal network to access to the HLR 14 or the MSC 13.

[94] Basically, the video alerting service begins as the MSC 13 inquires to the HLR 14 The result of the inquiry is transmitted to the video alerting server 17 and transmitted to the call transmitting mobile station 11 through the PDSN 16.

[95] 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 function of Moving Picture Experts Group (MPEG)-4, MPEG video can be played back. Each mobile station 11 or 18 has a different video processing function and different size and color of a liquid crystal display (LCD). So, the video alerting server 17 should manage these differences.

[96] 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 3 GPP Standard Multimedia formats, such as an MPEG layer 4 (MP4) format and a 3GP format.

[97] 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.

[98] To transmit a background video through the SCH, a preamble is used prior to the reception of the video data of a multimedia file format. The length of the video data of a multimedia file format may be different according to how channels are used. That is, 386-bit '0' is used for the preamble and the preamble can be decoded into a multimedia file or displayed.

[99] If a transport layer, such as Transmission Control Protocol (TCP) or User Datagram

Protocol (UDP), is formed in the mobile stations 11 and 18, multimedia data can be transmitted by using Real-Time Transport Protocol (RTP).

[100] The technology of the present invention requires a little modification to the mobile stations 11 and 18, the BTS, MSC 13, and PDSN 16.

[101] In Korea , various ring back tone services are provided actively. Since this also can be defined in the present invention, it is possible to transmit the video, voice andor audio data established by the called party to the call transmitting mobile station 11.

[102] Further expanding the technology of the present invention, it is also possible to transmit or cut off the pre-established video or audio data by using a specific button during communication. Therefore, diverse services may be sprung out and activated.

[103] Fig. 2 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.

[104] 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.

[105] 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 synchronous wireless telecommunication network with the call receiving mobile station 18 or a user terminal 19. The access through the Internet includes many methods utilizing the Web server 21, WAP server 22 and ARS 23.

[106] 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 synchronous 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 utilizing the Web server 21, WAP server 22 and ARS 23.

[107] Subsequently, at steps S201 and S202, the call transmitting mobile station 11 transmits calls to the call receiving mobile station 18. At step S203, the MSC inquires subscriber's location information and whether any value added service is subscribed to the HLR 14

[108] At step S204, the MSC recognizes that the called party is registered for the video alerting service and, at step S205, it requests the BTS to assign SVD data channels thereto. Then, at step S206, the BTS transmits an SVD data channel assignment request message to the call transmitting mobile station 11 and, at step S207, it assigns SVD data channels through the interface with the PDSN 16. At step S208, it informs the MSC that the SVD data channel assignment is completed successfully.

[109] 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.

[110] At step S209, 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 S210, the video alerting server 17 transmits the predetermined video to the PDSN 16.

[Ill] At step S211, the PDSN 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 S212, the BTS receives the video from the PDSN 16 and transmits it to the call transmitting mobile station 11. At step S213, 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, further description will not be provided herein.

[112] 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.

[113] 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.

[114] 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.

[115] 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. While the present invention has been described with respect to certain preferred embcdiments, 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 a synchronous wireless telecommunication system, comprising the steps of: a) a called party establishing video to be transmitted to a call transmitting mobile station during call alerting ; b) allocating channels for transmitting both voice and data simultaneously between the call transmitting mobile station and a synchronous network by making a transmitting mobile switching center (MSC) recognize that a call receiving mobile station is registered for the video alerting service, when the call transmitting mobile station calls the receiving mobile station; and c) transmitting the video established for the call receiving mobile station to the call transmitting mobile station through the channel where the voice and data can be transmitted simultaneously in the synchronous network.

[2] The method as recited in claim 1, further comprising a 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.

[3] The method as recited in claim 1, further comprising a step of: e) mediating communication between the call transmitting mobile station and the call receiving mobile station through conventional call processing after the video alerting, and transmitting the video to the call transmitting mobile station continuously during the communication.

[4] 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.

[5] The method as recited in claim 4, wherein the video is a still image or a moving picture including character images, natural images, and background images.

[6] 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 utilizing a channel assignment message that makes the call transmitting mobile station enter a traffic channel in the synchronous network.

[7] The method as recited in claim 6, wherein if the channel assignment message is received from the synchronous 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.

[8] A computer-readable recording medium for recording a program that implements a video alerting method, comprising the steps of: a) a called party establishing video to be transmitted to a call transmitting mobile station during call alerting ; b) allocating channels for transmitting both voice and data simultaneously between the call transmitting mobile station and a synchronous network by making a transmitting mobile switching center (MSC) recognize that a call receiving mobile station is registered for the video alerting service, when the call transmitting mobile station calls the receiving mobile station; and c) transmitting the video established for the call receiving mobile station to the call transmitting mobile station through the channel where the voice and data can be transmitted simultaneously in the synchronous network.

[9] The computer-readable recording medium as recited in claim 8, further comprising a 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.

[10] The computer-readable recording medium as recited in claim 8, further comprising a step of: e) mediating communication between the call transmitting mobile station and the call receiving mobile station through conventional call processing after the video alerting, and transmitting the video to the call transmitting mobile station continuously during the communication.