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SS Display Missiocau E STABLISH VOICE OR DATA S106 USOO8248453B2 (12) United States Patent (10) Patent No.: US 8.248,453 B2 Lee et al. (45) Date of Patent: Aug. 21, 2012 (54) CALL CONTROL SYSTEMAND METHOD (58) Field of Classification Search ............... 348/1401, FORMOBILE COMMUNICATION 348/1402, 14.03, 14.04-14.16; 379/201.01, 379/202.01; 370/260–271 (75) Inventors: Jong Phil Lee, Daegu (KR); Woo Jin See application file for complete search history. Ch.ang, Gumi-si (KR(KR) (56) References Cited (73) Assignee: Samsung Electronics Co., Ltd., Samsung-ro, Yeongton-gu, Suwon-si, U.S. PATENT DOCUMENTS Gyeonggi-do (KR) 7.359,373 B2 * 4/2008 Kuusinen et al. ............. 370,352 7,567,269 B2 * 7/2009 Sakano et al. ............. 348, 14.01 (*) Notice: Subject to any disclaimer, the term of this * cited by examiner patent is extended or adjusted under 35 U.S.C. 154(b) by 1341 days. Primary Examiner — Brian Ensey (74) Attorney, Agent, or Firm — Cha & Reiter, LLC (21) Appl. No.: 11/975,501 (57) ABSTRACT (22) Filed: Oct. 19, 2007 A call control system and method for mobile video telephony O O that enables an automatic call setup between a mobile video (65) Prior Publication Data telephony terminal and a mobile audio-dedicated terminal is US 2008/O1 OO692 A1 May 1, 2008 disclosed. A call control method for communication between mobile terminals having different capabilities includes (30) Foreign Application Priority Data receiving, at a called party terminal, a call setup message, transmitting a disconnection message to a calling party ter Oct. 31, 2006 (KR) - - - - - - - - - - - - - - - - - - - - - - - - 10-2006-O106058 minal in response to the video call setup message and per forming a call setup procedure triggered by the called part (51) Int. Cl. terminal. H04N 7/4 (2006.01) (52) U.S. Cl. .................................. 348/14.08: 348/14.01 25 Claims, 9 Drawing Sheets TRANSMIT V CALL REQFROM MOBILE VIDEOTELEPHONY TERMINATO MOBILE COMMUNICATIONNETWORK S102 TRANSMIT V CALL SETUP FROMMOBILE Y- COMMUNICATION NETWORK TO MOBILE AUDIO-DEDICATED TERMINAL SO X------ WideO Cal 2 TRANSMIT DISCONNECT FROM MOBILE S104 AUDEO-DEDICATED TERMINAL TO MOBELE VIDEO TELEPHONY TERMINAL S108 SS Display Missiocau ESTABLISH VOICE OR DATA S106. TRANSMIT ACALL REO FROM COMMUNICATIONLINK MOBILE AUDIO-DEDICATED TERMINATO MOBILE COMMUNICATIONNETWORK S107 TRANSMITA CALL SETUP FROM MOBILE COMMUNICATION NETWORK TO MOBILE WIDEOTELEPHONY TERMINAL S109-- ESTABLISH VOICE COMMUNICATIONLINK U.S. Patent Aug. 21, 2012 Sheet 1 of 9 US 8.248,453 B2 U.S. Patent Aug. 21, 2012 Sheet 2 of 9 US 8.248,453 B2 NOIIVOINNNNDO« | | | | | | | | | | | |DGI -7- --|- U.S. Patent Aug. 21, 2012 Sheet 3 of 9 US 8.248,453 B2 []||0.0}S INTERE, U.S. Patent Aug. 21, 2012 Sheet 4 of 9 US 8.248,453 B2 FIG. 4 WCALL SETUP Wea?ing Party Bigye?aféZ 25ge/ U.S. Patent Aug. 21, 2012 Sheet 5 Of 9 US 8.248,453 B2 FIG. 5 S101 TRANSMIT V CALL REQFROM MOBILE VIDEOTELEPHONY TERMINAL TO MOBILE COMMUNICATION NETWORK S102 TRANSMIT V CALL SETUP FROM MOBILE N- COMMUNICATION NETWORK TO MOBILE AUDIO-DEDICATED TERMINAL S103 N-- WideO Cal 2 NO S104 TRANSMIT DESCONNECT FROM MOBILE AUDIO-DEDICATED TERMINAL TO MOBILE VIDEOTELEPHONY TERMINAL S105 S108 s DISPLAY"MISSEDCALL" ESTABLISHVOICE OR DATA S106 TRANSMIT ACALL REO FROM COMMUNICATIONLINK MOBILE AUDIO-DEDICATED TERMINAL TO MOBILE COMMUNICATIONNEWORK S107 TRANSMITA CALL SETUP FROM MOBILE COMMUNICATION NETWORK TO MOBILE WIDEOTELEPHONY TERMINAL S109 ESTABLISH VOICE COMMUNICATIONLINK U.S. Patent Aug. 21, 2012 Sheet 6 of 9 US 8.248,453 B2 008 U.S. Patent Aug. 21 , 2012 Sheet 7 Of 9 US 8.248,453 B2 dnT?9ST?OLITOU L'50|| XHUMAHN 00Z U.S. Patent Aug. 21, 2012 Sheet 8 of 9 US 8.248,453 B2 FIG. 8 TRANSMIT V CALL REOFROM S2O1 MOBILE WIDEOTELEPHONY TERMINAL TO MOBILE COMMUNICATION NETWORK TRANSMIT V CALL SETUPFROM S2O2 MOBILE COMMUNICATIONNETWORK TO MOBILE AUDIO-DEDICATED TERMINAL Videocal ad-NO S211 YES TRANSMITD NOT SEUPFROM ESTABLISHVOICE OR DATA S2O4 N-MOBILE VOICE DEDICATED TERMINAL TO COMMUNICATION CHANNEL MOBILE WIDEO TELEPHONY TERMINAL S2O5 MOBILE WIDEO TELEPHONY TERMINAL RECEIVE NO A CALTRANST? S210 MOBILE WIDEO TELEPHONY MOBILE WIDEO TELEPHONY S2O6 TERMINAL GENERATEA CALL REQ TERMINAL GENERATE ALCALIREQ TRANSMIT ACAL REOTO S2O7 MOBILE COMMUNICATIONNETWORK TRANSMITA CALL SETUPFROM S208 MOBILE COMMUNICATION NETWORKTO MOBIE AUDIO-DEDICATED TERMINAL S209 ESTABLISH VOICE COMMUNICATIONLINK U.S. Patent Aug. 21, 2012 Sheet 9 of 9 US 8.248,453 B2 008 00Z00|| US 8,248,453 B2 1. 2 CALL CONTROL SYSTEMAND METHOD an audio-dedicated terminal that does not support the audio FORMOBILE COMMUNICATION visual communication service. CLAIM OF PRIORITY SUMMARY OF THE INVENTION This application claims, pursuant to 35 U.S.C. S 119(a), The present invention provides a call control system and priority to and the benefit of the earlier filing date of a Korean method for mobile communication that enable an automatic patent application entitled “CALL CONTROL SYSTEM call setup between mobile terminals having different capa AND METHOD FORMOBILE COMMUNICATION filed bilities. in the Korean Intellectual Property Office on Oct. 31, 2006 10 In accordance with an aspect of the present invention, a call and assigned Serial No. 2006-0106058, the contents of which control method for a communication between mobile termi are incorporated herein by reference. nals having different capabilities is disclosed. The call control method includes receiving, at a called party terminal, a call BACKGROUND OF THE INVENTION setup message, transmitting a disconnection message to a 15 calling party terminal in response to the video call setup 1. Field of the Invention message and performing a call setup procedure triggered by The present invention relates to mobile video telephony the called party terminal. and, in particular, to a call control system and method for In accordance with another aspect of the present invention, mobile video telephony that enable an automatic call setup a call control method for a mobile communication system between a mobile video telephony terminal and a mobile including a video telephony terminal, an audio-dedicated ter audio-dedicated terminal. minal, and a mobile communication network Supporting 2. Description of the Related Art communication between the terminals is disclosed. The call Video telephony is a service that enables participants to control method includes transmitting, at the video telephony communicate while viewing each other in real time. Video terminal, a video call request message to the mobile commu telephony can be implemented with a switch-based circuit 25 nication network, transmitting, at the mobile communication switching network or a packet switched All-IP network. network, a video call setup message to the audio-dedicated In order to implement video telephony over a mobile IP, terminal in response to the video call request message, trans H.323 and H.324M standards developed by the International mitting, at the audio-dedicated terminal, a disconnection Telecommunications Union (ITU) are recommended. message to the video telephony terminal through the mobile H.323 is a protocol designed to provide teleconferencing 30 communication network and transmitting, at the audio-dedi with Voice, video, and data capabilities on packet Switching cated terminal, an audio call request message to the mobile networks, and H.324 is a protocol for sharing voice, video and communication network. data over an analog telephone line. Meanwhile, H.324M In accordance with another aspect of the present invention, refers to a “mobile' extension of H.324 protocol developed a call control system for a mobile terminal is disclosed. The by the ITU. 35 call control system includes a radio frequency unit which H.324M uses H.261 and H.263 as video codecs and receives video call setup message, transmits a disconnection G.723.1 as an audio codec. H.261 is a digital video coding message in response to the video call setup message, and then standard designed for compressing and coding video data, transmits an audio call request message to a calling party and H263 and MPEG-4 are enhanced video codecs for com terminal, an audio processing unit for processing an audio pressed encoding for video conferencing. G.723.1 is an audio 40 signal generated during a communication session and a con codec providing 8Kbps codec bit rate. trol unit for controlling automatic transmission of the discon The Third Generation Partnership Project has adopted nection message and the audio call request message. H.324M as a standard for conversational video-telephony In accordance with another aspect of the present invention, over 3G, which is named 3G-324M. 3G-324M differs from a call control system includes an audio visual telephony ter H.324M in that it uses an Adaptive Multi-Rate (AMR) codec 45 minal that transmits a video call request message, an audio as the basic voice codec, and G.723.1 is optional. dedicated terminal that transmits a disconnection message to In addition, H.324 uses H.223 protocol for multiplexing the audio visual telephony terminal in response to the video Voice, video, and data; and H.245 protocol as a control pro call request message and a mobile communication network tocol for selecting a voice codec and assigning channels for a for Supporting communication between the audio visual tele point-to-point or a point-to-multipoint connection. 50 phony terminal and the audio-dedicated terminal. In the case of a video communication service using In accordance with another aspect of the present invention, H.324M, two terminals establish a call connection through a a call control method for a mobile terminal is disclosed. The call establishment procedure. Between the two terminals, an call control method includes transmitting a video call request audiovisual link is established. message, receiving an audiovisual communication unavail However, the conventional audiovisual communication 55 able message in response to the video call request message, service has a limitation in establishing a communication link and transmitting an audio call request message in response to between a video communication-enabled terminal and an the audiovisual communication unavailable message.
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