WO2008078853A1 - Procédé de réception efficace d'une séquence vidéo au moyen d'un mécanisme de notification de la puissance du signal reçu dans un environnement iptv - Google Patents

Procédé de réception efficace d'une séquence vidéo au moyen d'un mécanisme de notification de la puissance du signal reçu dans un environnement iptv Download PDF

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Publication number
WO2008078853A1
WO2008078853A1 PCT/KR2007/000816 KR2007000816W WO2008078853A1 WO 2008078853 A1 WO2008078853 A1 WO 2008078853A1 KR 2007000816 W KR2007000816 W KR 2007000816W WO 2008078853 A1 WO2008078853 A1 WO 2008078853A1
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WO
WIPO (PCT)
Prior art keywords
signal
strength
bit rate
received
content data
Prior art date
Application number
PCT/KR2007/000816
Other languages
English (en)
Inventor
Yong-Jin Kim
Kyung-Su Kim
Hyun-Jong Lee
Jun-Kyun Choi
Original Assignee
Modacom Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Modacom Co., Ltd. filed Critical Modacom Co., Ltd.
Publication of WO2008078853A1 publication Critical patent/WO2008078853A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]

Definitions

  • the present invention relates to the transmission of content data depending on received signal strength in a mobile Internet Protocol Television (hereinafter referred to as 'IPTV) environment and, more particularly, to a method of transmitting content data depending on signal strength, which varies the data transmission rate according to the strength of a received signal in the mobile IPTV environment and can transmit content data at the varied data transmission rate.
  • 'IPTV mobile Internet Protocol Television
  • FIG. 1 is a diagram showing the construction of ajypical system for IPTV service.
  • the system for IPTV service includes a server system that includes an IPTV server 20, that is, a Service Provider (SP), for performing subscriber access management, and content data transmission control for providing IPTV service, a Streaming Server (SS) 20 for encoding content, which is transmitted to a user, to streaming data and transmitting the encoded data under the control of the IPTV server 10, and a content providing server 30, that is, a Content Provider (CP), for providing the content, an access network that includes a PSTN, a mobile communication network, the like for supporting network communication based on the Internet Protocol (IP), subscriber access units that provide respective access points, such as a base station 41, an access point 42 and a Local Area Network (LAN) 43, and subscriber devices 50, such as a TV, a mobile terminal and a computer, that receive the IPTV service via the subscriber access units.
  • IP Internet Protocol
  • subscriber access units that provide respective access points, such as a base station 41, an access point 42 and a Local Area Network (LAN) 43
  • IPTV service provided by the construction of the above-described system enables content, which is transmitted via a wired and wireless network in a streaming fashion using the Internet Protocol (IP), to be viewed via a TV set, and provides multimedia service, such as TV/video/audio/text data, which is transmitted via an IP-based network that provides a required level of Quality of Service/Quality of Experience (QoS/QoE), information protection, interactivity and reliability.
  • IP Internet Protocol
  • QoS/QoE Quality of Service/Quality of Experience
  • a mobile environment has characteristics such that the communication bandwidth is low and variation in the strength of a signal received from the base station or each access point occurs frequently due to interference from and the influence of the surroundings. Furthermore, variation in the strength of the signal is also caused by a user's movements. In the case where the variation in the strength of the signal occur frequently due to the user's movements, in particular, in the case where the strength of the signal is low, the interruption of received images occurs due to a high error rate and a high loss rate when content having a high bit rate is transmitted.
  • an object of the present invention is to provide a method of transmitting content data depending on signal strength in a mobile IPTV environment, which, after pieces of video content having different bit rates and a multiplexer are stored in a server (hereinafter referred to as a 'media server') for storing content data for providing IPTV service, causes a mobile terminal to notify the media server of variation in the strength of the currently received signal whenever the mobile terminal detects such variation in the strength of the signal, thus enabling the media server to transmit content having a suitable bit rate.
  • a server hereinafter referred to as a 'media server'
  • the present invention provides a method of transmitting content data depending on signal strength in a mobile
  • IPTV environment including a received-signal-variation notification process of a mobile terminal detecting the strength of a received radio signal and providing a media server with a notification message when the detected signal strength is greater than an allowable variation value; and a transmission bit rate conversion process of the media server receiving a received signal strength variation value, which is included in the notification message, and performing conversion such that content data, having a bit rate suitable for the strength of the received signal, is transmitted to the mobile terminal.
  • the received-signal-variation notification process includes a signal strength detection step of the mobile terminal detecting the strength of the received radio signal, storing the detected signal strength as the strength of a currently received signal, and obtaining a difference between the strength of the currently received signal and the strength of a previously received signal; a comparison step of comparing a value of the detected difference between the signal strengths, which is obtained at the signal strength detection step, with a predetermined threshold value; a bit rate calculation step of calculating a receptible bit rate of the corresponding signal, if, as a result of the comparison of the comparison step, the value of the detected difference between the signal strengths is greater than the predetermined threshold value; and a received bit rate notification step of notifying the media server of a result value, which is obtained from the calculation of the bit rate calculation step, as the notification message.
  • the transmission bit rate conversion process includes a content data selection step of selecting content data having a bit rate closest to the receptible bit rate of the mobile terminal, which is included in the notification message; and a data transmission rate conversion step of detecting a region of previously transmitted content data from the selected content data, and transmitting the content data from the corresponding region in a streaming fashion.
  • the present invention enables a user to uninterruptedly receive service by varying the bit rate of content transmitted to a mobile terminal according to the strength of the signal received by the mobile terminal and transmitting the resultant content, so that the quality of the IPTV service can be remarkably improved.
  • FIG. 1 is a diagram showing the construction of a typical network for IPTV service
  • FIG. 2 is a flowchart illustrating processing in a mobile terminal in a method of transmitting content data depending on signal strength in a mobile IPTV environment, according to the present invention.
  • FIG. 3 is a flowchart illustrating processing in a media server, which is performed in response to the reception of a notification message transmitted as a result of the processing of FIG. 2, according to an embodiment of the present invention.
  • FIG. 2 is a flowchart illustrating a process of a mobile terminal calculating a transmissible bit rate_according to the strength of a received signal, and providing the media server with a notification message in a method of transmitting content data depending on signal strength in a mobile IPTV environment, according to the present invention.
  • the mobile terminal in order to transmit the notification message to the media server based on the strength of a signal, the mobile terminal initializes a previous signal strength value 'pRSS', a current signal strength value 'cRSS', and variation in signal strength 'DIFF' at a starting step S 1. After the initialization process of the step Sl has been performed, the mobile terminal updates the previous signal strength value 'cRSS' using current signal strength, and calculates the variation in signal strength 'DIFF' at step S2.
  • step S2 the mobile terminal determines whether the calculated variation in signal strength 'DIFF' is greater than a predetermined threshold value 'THdiff at step S3. If, as a result of the determination of step S3, it is determined that the calculated variation in signal strength 'DIFF' is not greater than the predetermined threshold value 'THdiff,' the process returns to step S2, and the processings are repeated. In contrast, if, as a result of the determination of step S3, it is determined that the calculated variation in signal strength 'DIFF' is greater than the predetermined threshold value 'THdiff,' it is determined that the variation in signal strength is sufficiently great, and an updated current signal strength value is compared with a minimum required threshold value 'THmin' at step S4.
  • step S4 If, as a result of the comparison of step S4, the current signal strength value is equal to or smaller than the minimum required threshold value, the mobile terminal transmits a temporary-video-interruption control message to the media server, and waits while monitoring the current signal strength until the current signal strength improves at step S5. In contrast, if, as a result of the comparison of step S4, the current signal strength value is greater the minimum required threshold value, the bit rate 'cRATE' of a video source to be newly received is estimated, and then an estimated value is transmitted to the media server at step S6.
  • step S6 whether content data reception service is terminated is determined. If it is determined that the content data reception service has been terminated, the process is terminated. In contrast, if it is determined that content data reception service is not terminated, the process returns to step S2 and the processings are repeated at step S7.
  • FIG. 3 is a flowchart illustrating a process in the media server, which is performed in response to the reception of a notification message transmitted as a result of the processing of FIG. 2, according to an embodiment of the present invention.
  • the media server transmits a video source at a bit rate that is predetermined at an early stage at step SI l.
  • the media server After having received the notification message while waiting for the notification message transmitted from the mobile terminal at step S 12, the media server determines whether the received notification message is bit rate information at step S 13. If, as a result of the determination of step Sl 3, it is determined that the received notification message is not bit rate information, appropriate message processing is performed. Furthermore, if it is determined that the received notification message is not bit rate information, it is determined that the strength of the signal received by the terminal is not sufficiently great, and a process of temporarily interrupting the transmission of the video source is performed at step S 14.
  • the media server transmits a video source (content data) having the value closest to the received bit rate information, among various video sources which have different bit rates and are stored on the media server, at step Sl 5.
  • step 16 Thereafter, whether the transmission of the content data is completed is determined at step 16. If it is determined that the transmission of the content data has not been completed, the process returns to step SI l and the processings are repeated. In contrast, if it is determined that the transmission of the content data has been completed, the process is terminated.
  • the present invention allows the media server to accurately measure the available bandwidth that can be used for transmission to the mobile terminal, thus enabling content data (video source) to be efficiently transmitted.
  • the present invention is applicable to an IPTV mobile field, and thus can provide IPTV service that is not affected by variation in a telephony environment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention porte notamment sur un procédé de transmission de données de contenu en fonction de la puissance du signal, laquelle fait varier le débit de transmission en fonction de la puissance reçue dans l'environnement de télévision mobile protocole Internet (IPTV) et peut transmettre des données à débit variable de transmission de données.. Ce procédé englobe les opérations suivantes: notification des variations du signal reçu dans le cas d'un téléphone mobile détectant la puissance d'un signal radio reçu et fournissant à un serveur de média un message de notification lorsque la puissance du signal détecté dépasse une valeur de variation acceptable; conversion du débit binaire de transmission du serveur média recevant une valeur de variation de puissance du signal, qui est incluse dans le message de notification; et exécution d'une conversion telle que les données de contenu, dont le débit binaire convient pour la puissance du signal reçu, est transmise au terminal mobile.
PCT/KR2007/000816 2006-12-26 2007-02-15 Procédé de réception efficace d'une séquence vidéo au moyen d'un mécanisme de notification de la puissance du signal reçu dans un environnement iptv WO2008078853A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2006-0133718 2006-12-26
KR1020060133718A KR100880568B1 (ko) 2006-12-26 2006-12-26 모바일 아이피티브이 환경에서 신호세기에 따른 컨텐츠데이터 전송 방법

Publications (1)

Publication Number Publication Date
WO2008078853A1 true WO2008078853A1 (fr) 2008-07-03

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PCT/KR2007/000816 WO2008078853A1 (fr) 2006-12-26 2007-02-15 Procédé de réception efficace d'une séquence vidéo au moyen d'un mécanisme de notification de la puissance du signal reçu dans un environnement iptv

Country Status (2)

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KR (1) KR100880568B1 (fr)
WO (1) WO2008078853A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8531979B2 (en) 2009-09-30 2013-09-10 Sony Corporation Wireless link quality monitoring in network-enabled TVs

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170098632A (ko) * 2016-02-22 2017-08-30 에스케이텔레콤 주식회사 인코더 장치 및 그 비디오 데이터 제공 방법

Citations (3)

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Publication number Priority date Publication date Assignee Title
US20040017790A1 (en) * 2002-07-25 2004-01-29 Koninlijke Philips Electronics N.V. Method and system for generating and updating transmission rate for link adaptation in IEEE 802.11 WLAN
US20040110470A1 (en) * 2002-12-09 2004-06-10 Tsien Chih C. Method and apparatus to control transmitter
US20060187885A1 (en) * 2005-02-23 2006-08-24 Interdigital Technology Corporation Wireless communication method and apparatus for dynamically adapting packet transmission rates

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KR100676645B1 (ko) * 1999-07-20 2007-02-01 코닌클리케 필립스 일렉트로닉스 엔.브이. 드리프트-프리 트랜스코더 및 관련 방법
JP3832321B2 (ja) 2001-11-20 2006-10-11 日本電気株式会社 放送通信融合端末及びコンテンツ配信システム
WO2004093404A1 (fr) * 2003-04-17 2004-10-28 Sharp Kabushiki Kaisha Emetteur, recepteur, systeme sans fil, procede de commande, programme de commande, et support d'enregistrement lisible par un ordinateur contenant le programme

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
US20040017790A1 (en) * 2002-07-25 2004-01-29 Koninlijke Philips Electronics N.V. Method and system for generating and updating transmission rate for link adaptation in IEEE 802.11 WLAN
US20040110470A1 (en) * 2002-12-09 2004-06-10 Tsien Chih C. Method and apparatus to control transmitter
US20060187885A1 (en) * 2005-02-23 2006-08-24 Interdigital Technology Corporation Wireless communication method and apparatus for dynamically adapting packet transmission rates

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8531979B2 (en) 2009-09-30 2013-09-10 Sony Corporation Wireless link quality monitoring in network-enabled TVs

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KR20080059866A (ko) 2008-07-01
KR100880568B1 (ko) 2009-01-30

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